Fully automatic ratio adjustment of fuel to air ratio: saving money and benefiting the environment
1. International and domestic trends of combustion system and control:
1. European and American countries representing the world's advanced combustion technology - safe, efficient, environmentally friendly and automatic.
The burners are all adjusted with differential, integral calculation or more complex calculation instruments (such as: proportional regulator, PLC, large-scale computer control, etc.), through the boiler outlet water temperature, steam pressure, steam flow, oxygen content in the flue gas , Boiler water supply system and other factors detection, synchronous and continuous dynamic adjustment of fuel volume and air distribution volume. In a word, only when the combustion conditions are adjusted synchronously and continuously with the changes of boiler conditions and flue gas emissions can the effects of high efficiency and environmental protection be achieved.
The EU burner standard stipulates that the burner must have: wind pressure detection, flame detection, flameout protection, gas high pressure protection, gas low pressure protection, gas leakage protection, exhaust gas temperature protection, etc., and also requires the burner and boiler overpressure, overpressure Temperature, water level, continuous water supply, exhaust gas temperature, etc. are interlocked for protection. Any failure of the boiler, the burner must stop running at the same time.
2. Domestic status and development trend
At present, there are three types of combustion systems: full manual operation, fully automatic position type, and fully automatic proportional adjustment.
Full manual operation: This combustion method is that fuel or gas is burned at a fixed flow rate and air is mixed at a fixed flow rate. It is mainly distributed in major oil fields such as Daqing, Shengli, Liaohe, and Western China. The fuel is mainly crude oil, and some are Heavy oil; this is a combustion method that only focuses on combustion effects rather than operating costs and safety, resulting in a large amount of energy waste and safety accidents; under the new situation dominated by market economic benefits, such combustion systems are gradually favored by smart users Abandon, for example: University of Petroleum (Dongying) Shenghua Oil Refinery 40T steam boiler, after rigorous demonstration, decided to adopt advanced combustion system - imported oil-gas mixed burner.
Fully automatic position type: This kind of combustion system has all automatic and safety protection functions, but the adjustment of fuel and air is one-stage, two-stage or three-stage adjustment, which is suitable for small boilers or industrial furnaces.
Fully automatic proportional adjustment: using proportional regulators, PLC, DCS, BLM, etc. to realize the ratio of fuel and air mixed combustion logic calculations, real to complete combustion, saving energy to the greatest extent and protecting the environment. Domestic typical examples: 6 114MW boilers of Beijing Shuangyushu Thermal Power Plant, 35T boilers of Shanghai Jinshan Petrochemical Co., Ltd., 35T boilers of Tianjin No.
Making good use of energy and protecting the environment are important issues of national policy for sustainable development in the 21st century. With the advancement of scientific development awareness and concepts, advanced combustion systems are being vigorously promoted and applied.
3. The Industrial Boiler Association is entrusted by the relevant state departments to draft the "Standards for Automatic Control of Oil-fired Gas Boilers". At that time, a large-scale oil and gas boiler safety inspection activity will be formed across the country.
2. Economic benefits of proportional adjustment combustion system:
1. Boiler high-efficiency and energy-saving operation mode: Under the condition of meeting the technical requirements, it should operate continuously with low load as much as possible. That is to save operating costs, but also prolong the life of the boiler. This mode of operation and its advantages have long been confirmed and popularized by many users and experts in Beijing. This alone can save energy by 8-15%, and only the proportional adjustment combustion system can realize this mode of operation.
2. Combustion efficiency: 99.9%, namely: complete combustion. (The fully manual combustion system cannot be adjusted with complex changes in the load and changes in the oxygen content of the flue gas. According to experience, its combustion efficiency is generally around 85%)
3. Several parameters affecting complete combustion:
3.1 Temperature and flow rate of combustion air
3.2 The lower consumption and excess coefficient of combustion air, for example, natural gas theoretically consumes 8.4-9.9 cubic air per cubic meter, the excess coefficient is 1.05-1.2, heavy oil theoretically consumes 10.6 cubic air per kilogram
3.3 Flue gas velocity and flow
3.4 Type of fuel, injection speed, injection angle, calorific value, composition, etc.
3.5 Structural type of boiler
4. Taking heavy oil as an example to calculate the unit oil consumption per ton of steam:
4.1 The calorific value of heavy oil is generally 9700Kcal/kg
4.2 When the superheated steam is 350°C and 15kgf/cm2, its calorific value is 3139KJ/kg; therefore, the calorific value of 1T steam is:
Q=3139×1000／4.2=74.7×104kcal
4.3 The thermal efficiency of the boiler is 90%, and the oil consumption per ton of steam is:
w=74.7×104kcal÷9700÷0.9÷99.9%=86.1kg
5. Comparison of economic benefits of hand-operated combustion systems:
5.1 For the manual combustion system, take heavy oil as an example, the oil consumption per ton of steam:
w=74.7×104÷9700÷85%÷90%=100.7kg
5.2 Fuel saving: one ton of steam saves 14.6kg
(100.7-86.1) ÷ 100.7×100%=14.5%
5.3 20T steam boiler saves fuel annually, taking heavy oil as an example: 200T steam is needed every day, and it runs for 300 days
200×14.6×300＝876000kg=876T
5.4 Save 876 tons of heavy oil every year, calculated at 1,500 yuan per ton, 1,500×876=1,314,000=1,314,000 yuan
6. Damage and cost increase caused by incomplete combustion:
6.1 Heavy oil is incompletely burned, and carbon black is formed in the flue gas because it is relatively difficult to burn out high molecular hydrocarbons. If the air supply is insufficient or the mixture of oil particles and air is not uniform, there will be some high molecular hydrocarbons at high temperature and lack of oxygen. Cracking occurs under certain conditions, and carbon black is decomposed. Carbon black is a solid particle with a particle size of less than 1 μm. Its chemical properties are inactive and its combustion is slow. Therefore, once carbon black is produced, it is often difficult to burn out. In severe cases, unburned carbon black It will enter the flue gas and make the chimney emit black smoke.
Bitumen components in heavy oil will also decompose into solid oil coke due to lack of oxygen. After the oil coke is broken, it becomes coke particles, which are also not easy to burn. It can be seen that an important problem in the combustion of heavy oil is that the air required for combustion must be supplied in time.
6.2 Incomplete combustion of heavy oil, the fly ash, carbon black, coke particles and similar tar substances will be mixed and attached to the water wall or convection tube bundle, forming a layer of heat insulation over time, which greatly reduces the thermal efficiency of the boiler. Cleaning the boiler increases operating costs and causes uneven heating of the boiler, shortening the life of the boiler.
6.3 The air distribution of the manual combustion system is primary air and cannot be adjusted automatically. This will cause a high temperature area at the root of the flame and strong heat radiation, which will increase the temperature of the oil nozzle. When the heavy oil is heated at high temperature, carbon will be precipitated, thereby blocking the nozzle and increasing the fuel consumption. The wear of the large nozzle will accelerate the damage of the spray gun, resulting in the increase of maintenance costs, which is a great obstacle to the improvement of the production capacity of continuous production enterprises.
Summary: Supply appropriate amount of air to different areas in time to avoid carbon black caused by high temperature and oxygen deficiency and ensure complete combustion of oil with the least amount of excess air. The above requirements for the combustion of fuel oil are achieved by the burner. The oil burner is mainly composed of an oil atomizer and an air regulator. The fuel oil is atomized into fine oil particles through the atomizer, sprayed into the furnace at a certain atomization angle, and mixed with the air flow with a certain shape of velocity distribution sent through the air regulator. The cooperation between the oil atomizer and the air regulator should enable most of the air required for combustion to be supplied from the root of the torch in time, and make the air distribution volume of the torch adapt to the flow density distribution of the oil mist. At the same time, a certain amount of air should be supplied to the tail of the flare to ensure that the carbon black and coke particles are burned out.
3. Comparison of several heavy oil combustion methods:
With the improvement of the world's environmental protection situation and domestic environmental protection awareness, more and more clean fuels are used, and the use of heavy oil as fuel can save more costs than light oil, especially for many units that have as associated waste oil; domestic use Heavy oil/residual oil is generally used as fuel in the following ways:
·Below No. 60 in China, use the general mechanical pressure atomization method, most burners can do it;
· Domestic No. 100, imported burners use electronic temperature control devices to control fuel oil heating, which can be achieved and successfully applied all over the world;
Domestic heavy oil/residual oil/crude oil above No. 100 must use medium atomization or mechanical rotor atomization;
·Medium atomizing burner, using compressed air or steam as the atomizing medium, such as imported Oilon;
·Mechanical rotary cup atomization burner adopts high-speed rotary cup for mechanical atomization.
·Mechanical pressure atomization burner adopts high-pressure oil pump for pressure atomization.
The three atomization methods are compared as follows:
(Excerpted from Page 88 of "Design Manual for Oil-fired and Gas-fired Boiler Houses", Machinery Industry Press)
newmaker.com
The above comparison can draw the following conclusions:
The medium atomized oil particles are uniform, and the ignition is easier;
·Medium atomization is more suitable for boilers with positive pressure combustion;
There are no high-speed components in the medium atomization, which makes maintenance easier and lower in cost;
·Medium atomization has almost no requirements on fuel viscosity, which saves operating costs;
4. The safety of proportional regulation combustion system:
The atomized oil mist and gas are combustible gases. When mixed with air to a certain content range, they can form flammable and explosive mixed gases. Therefore, special requirements are put forward for the safety and explosion protection of oil-fired gas boilers.
When the mixed gas reaches the maximum explosive content, the explosion pressure in the sealed container can reach 0.75~1.65Mpa according to different gases. The pressure bearing capacity of the furnace and flue gas channel of the water tube boiler is generally only a few hundred to a few thousand millimeters of water column. Consider high pressure. Therefore, the explosion of the mixed gas will cause great damage to the enclosure structure of the boiler flue gas channel and the structure of the heating surface.
Gas explosion accidents in the furnace and flue of oil-fired gas-fired boilers have occurred frequently at home and abroad. In the slightest, it will cause the boiler to explode and flameout, and in severe cases, the furnace and flue will burst, the induced draft fan will be damaged, the boiler room and the chimney will be damaged, and even casualties will be caused.
To analyze and find out the cause of the accident, it is because there is an explosive mixed gas in the furnace or flue, which reaches the explosion limit, and is ignited by an open flame or the high temperature of the boiler itself, and the accident occurs.
Among all accidents, the most accidents occurred during boiler ignition, accounting for more than 50% of oil-fired boiler explosion accidents and more than 70% of gas-fired boiler explosion accidents.
Before the boiler is ignited, when the fuel gas leaks into the furnace due to some reasons, such as the valve is not sealed, misoperation, one-time ignition is not successful, etc., and the furnace flue has not been purged or the time for purging is not enough, and the air volume is insufficient, then It will explode when ignited.
During the operation of the boiler, there are many explosion accidents caused by flameout, and there are many oil-fired boilers, because the possibility of flameout of the oil-fired boiler is relatively high. Such accidents of gas-fired boilers mostly occur when the gas pressure or wind pressure fluctuates too much in front of the burner, causing defiring or tempering.
For boilers operating under negative pressure, when the boiler burns poorly, combustible gas enters the rear flue of the boiler and mixes with the air leaking in from the rear flue to form explosive gas, which may cause secondary combustion or explosion under high temperature.
It can be seen from the above that to prevent the furnace or flue from exploding, first of all, fuel should be prevented from entering the furnace when there is no open flame in the furnace, and secondly, good combustion must be ensured. As a precautionary measure, the furnace and flue must be carefully purged before ignition, so that the flammable gas that may accumulate in it can be removed in time.
From the safety point of view, the automation of the fuel gas boiler combustion system is necessary, including ignition pre-purge, ignition program control, flame detection, flameout protection, combustion automatic adjustment, etc. And all this comes standard with a modulating combustion system.
5. Comparison of imported burners and domestic burners:
1. The professional manufacturer of imported burners has experienced decades of design and production experience. The products have gone through a long process from design to test and then back to design and improvement. The products produced are very mature. For example, imported products have more than ten series and more than five hundred models, while domestic burners started relatively late, and the products are still in the imitation stage.
2. Don't say that there is a big gap between imported burners and domestic burners. There is also a big gap between imported burners produced by some non-professional manufacturers and imported burners produced by professional manufacturers. Changzhou Huayuan Leidis is a joint venture between Italy and China. After eight years of operation, the imported Italian boilers are equipped with burners. Due to many combustion failures, one of them has been scrapped and replaced with a domestic boiler with imported burners. After more than a year of operation, the response has been good, and it has basically achieved trouble-free operation. Calculated according to the loss caused by the failure, its hourly output is 7 million yuan, and the imported products have recovered immeasurable economic losses for customers. Take the user's own words: With these losses, several burners were bought back.
3. As far as the product itself is concerned, the main differences are as follows:
(1) All accessories of the burner produced by imported professional manufacturers are European products. Burner failure rate is low.
(2) The mechanical and electrical integration of the product is relatively complete, and the degree of automation is high.
(3) The control system is advanced and mature.
(4) It is convenient for maintenance, no need to screw the screw when changing the gun, and it can be put into operation within five minutes.
(5) Oil products have a wide range of applications, regardless of "coarse grains" or "fine grains", they will suit your taste, and you will not be picky about food.
(6) The combustion efficiency is high, and the flue gas emission is designed according to the European standard.
(7) The atomization effect is good, the atomized particles are between "30υ~50υ", the boiler does not accumulate dust, not to mention no carbon accumulation.
Fully automatic ratio adjustment of fuel to air ratio: saving money and benefiting the environment
1. International and domestic trends of combustion system and control:
1. European and American countries representing the world's advanced combustion technology - safe, efficient, environmentally friendly and automatic.
The burners are all adjusted with differential, integral calculation or more complex calculation instruments (such as: proportional regulator, PLC, large-scale computer control, etc.), through the boiler outlet water temperature, steam pressure, steam flow, oxygen content in the flue gas , Boiler water supply system and other factors detection, synchronous and continuous dynamic adjustment of fuel volume and air distribution volume. In a word, only when the combustion conditions are adjusted synchronously and continuously with the changes of boiler conditions and flue gas emissions can the effects of high efficiency and environmental protection be achieved.
The EU burner standard stipulates that the burner must have: wind pressure detection, flame detection, flameout protection, gas high pressure protection, gas low pressure protection, gas leakage protection, exhaust gas temperature protection, etc., and also requires the burner and boiler overpressure, overpressure Temperature, water level, continuous water supply, exhaust gas temperature, etc. are interlocked for protection. Any failure of the boiler, the burner must stop running at the same time.
2. Domestic status and development trend
At present, there are three types of combustion systems: full manual operation, fully automatic position type, and fully automatic proportional adjustment.
Full manual operation: This combustion method is that fuel or gas is burned at a fixed flow rate and air is mixed at a fixed flow rate. It is mainly distributed in major oil fields such as Daqing, Shengli, Liaohe, and Western China. The fuel is mainly crude oil, and some are Heavy oil; this is a combustion method that only focuses on combustion effects rather than operating costs and safety, resulting in a large amount of energy waste and safety accidents; under the new situation dominated by market economic benefits, such combustion systems are gradually favored by smart users Abandon, for example: University of Petroleum (Dongying) Shenghua Oil Refinery 40T steam boiler, after rigorous demonstration, decided to adopt advanced combustion system - imported oil-gas mixed burner.
Fully automatic position type: This kind of combustion system has all automatic and safety protection functions, but the adjustment of fuel and air is one-stage, two-stage or three-stage adjustment, which is suitable for small boilers or industrial furnaces.
Fully automatic proportional adjustment: using proportional regulators, PLC, DCS, BLM, etc. to realize the ratio of fuel and air mixed combustion logic calculations, real to complete combustion, saving energy to the greatest extent and protecting the environment. Domestic typical examples: 6 114MW boilers of Beijing Shuangyushu Thermal Power Plant, 35T boilers of Shanghai Jinshan Petrochemical Co., Ltd., 35T boilers of Tianjin No.
Making good use of energy and protecting the environment are important issues of national policy for sustainable development in the 21st century. With the advancement of scientific development awareness and concepts, advanced combustion systems are being vigorously promoted and applied.
3. The Industrial Boiler Association is entrusted by the relevant state departments to draft the "Standards for Automatic Control of Oil-fired Gas Boilers". At that time, a large-scale oil and gas boiler safety inspection activity will be formed across the country.
2. Economic benefits of proportional adjustment combustion system:
1. Boiler high-efficiency and energy-saving operation mode: Under the condition of meeting the technical requirements, it should operate continuously with low load as much as possible. That is to save operating costs, but also prolong the life of the boiler. This mode of operation and its advantages have long been confirmed and popularized by many users and experts in Beijing. This alone can save energy by 8-15%, and only the proportional adjustment combustion system can realize this mode of operation.
2. Combustion efficiency: 99.9%, namely: complete combustion. (The fully manual combustion system cannot be adjusted with complex changes in the load and changes in the oxygen content of the flue gas. According to experience, its combustion efficiency is generally around 85%)
3. Several parameters affecting complete combustion:
3.1 Temperature and flow rate of combustion air
3.2 The lower consumption and excess coefficient of combustion air, for example, natural gas theoretically consumes 8.4-9.9 cubic air per cubic meter, the excess coefficient is 1.05-1.2, heavy oil theoretically consumes 10.6 cubic air per kilogram
3.3 Flue gas velocity and flow
3.4 Type of fuel, injection speed, injection angle, calorific value, composition, etc.
3.5 Structural type of boiler
4. Taking heavy oil as an example to calculate the unit oil consumption per ton of steam:
4.1 The calorific value of heavy oil is generally 9700Kcal/kg
4.2 When the superheated steam is 350°C and 15kgf/cm2, its calorific value is 3139KJ/kg; therefore, the calorific value of 1T steam is:
Q=3139×1000／4.2=74.7×104kcal
4.3 The thermal efficiency of the boiler is 90%, and the oil consumption per ton of steam is:
w=74.7×104kcal÷9700÷0.9÷99.9%=86.1kg
5. Comparison of economic benefits of hand-operated combustion systems:
5.1 For the manual combustion system, take heavy oil as an example, the oil consumption per ton of steam:
w=74.7×104÷9700÷85%÷90%=100.7kg
5.2 Fuel saving: one ton of steam saves 14.6kg
(100.7-86.1) ÷ 100.7×100%=14.5%
5.3 20T steam boiler saves fuel annually, taking heavy oil as an example: 200T steam is needed every day, and it runs for 300 days
200×14.6×300＝876000kg=876T
5.4 Save 876 tons of heavy oil every year, calculated at 1,500 yuan per ton, 1,500×876=1,314,000=1,314,000 yuan
6. Damage and cost increase caused by incomplete combustion:
6.1 Heavy oil is incompletely burned, and carbon black is formed in the flue gas because it is relatively difficult to burn out high molecular hydrocarbons. If the air supply is insufficient or the mixture of oil particles and air is not uniform, there will be some high molecular hydrocarbons at high temperature and lack of oxygen. Cracking occurs under certain conditions, and carbon black is decomposed. Carbon black is a solid particle with a particle size of less than 1 μm. Its chemical properties are inactive and its combustion is slow. Therefore, once carbon black is produced, it is often difficult to burn out. In severe cases, unburned carbon black It will enter the flue gas and make the chimney emit black smoke.
Bitumen components in heavy oil will also decompose into solid oil coke due to lack of oxygen. After the oil coke is broken, it becomes coke particles, which are also not easy to burn. It can be seen that an important problem in the combustion of heavy oil is that the air required for combustion must be supplied in time.
6.2 Incomplete combustion of heavy oil, the fly ash, carbon black, coke particles and similar tar substances will be mixed and attached to the water wall or convection tube bundle, forming a layer of heat insulation over time, which greatly reduces the thermal efficiency of the boiler. Cleaning the boiler increases operating costs and causes uneven heating of the boiler, shortening the life of the boiler.
6.3 The air distribution of the manual combustion system is primary air and cannot be adjusted automatically. This will cause a high temperature area at the root of the flame and strong heat radiation, which will increase the temperature of the oil nozzle. When the heavy oil is heated at high temperature, carbon will be precipitated, thereby blocking the nozzle and increasing the fuel consumption. The wear of the large nozzle will accelerate the damage of the spray gun, resulting in the increase of maintenance costs, which is a great obstacle to the improvement of the production capacity of continuous production enterprises.
Summary: Supply appropriate amount of air to different areas in time to avoid carbon black caused by high temperature and oxygen deficiency and ensure complete combustion of oil with the least amount of excess air. The above requirements for the combustion of fuel oil are achieved by the burner. The oil burner is mainly composed of an oil atomizer and an air regulator. The fuel oil is atomized into fine oil particles through the atomizer, sprayed into the furnace at a certain atomization angle, and mixed with the air flow with a certain shape of velocity distribution sent through the air regulator. The cooperation between the oil atomizer and the air regulator should enable most of the air required for combustion to be supplied from the root of the torch in time, and make the air distribution volume of the torch adapt to the flow density distribution of the oil mist. At the same time, a certain amount of air should be supplied to the tail of the flare to ensure that the carbon black and coke particles are burned out.
3. Comparison of several heavy oil combustion methods:
With the improvement of the world's environmental protection situation and domestic environmental protection awareness, more and more clean fuels are used, and the use of heavy oil as fuel can save more costs than light oil, especially for many units that have as associated waste oil; domestic use Heavy oil/residual oil is generally used as fuel in the following ways:
·Below No. 60 in China, use the general mechanical pressure atomization method, most burners can do it;
· Domestic No. 100, imported burners use electronic temperature control devices to control fuel oil heating, which can be achieved and successfully applied all over the world;
Domestic heavy oil/residual oil/crude oil above No. 100 must use medium atomization or mechanical rotor atomization;
·Medium atomizing burner, using compressed air or steam as the atomizing medium, such as imported Oilon;
·Mechanical rotary cup atomization burner adopts high-speed rotary cup for mechanical atomization.
·Mechanical pressure atomization burner adopts high-pressure oil pump for pressure atomization.
The three atomization methods are compared as follows:
(Excerpted from Page 88 of "Design Manual for Oil-fired and Gas-fired Boiler Houses", Machinery Industry Press)
newmaker.com
The above comparison can draw the following conclusions:
The medium atomized oil particles are uniform, and the ignition is easier;
·Medium atomization is more suitable for boilers with positive pressure combustion;
There are no high-speed components in the medium atomization, which makes maintenance easier and lower in cost;
·Medium atomization has almost no requirements on fuel viscosity, which saves operating costs;
4. The safety of proportional regulation combustion system:
The atomized oil mist and gas are combustible gases. When mixed with air to a certain content range, they can form flammable and explosive mixed gases. Therefore, special requirements are put forward for the safety and explosion protection of oil-fired gas boilers.
When the mixed gas reaches the maximum explosive content, the explosion pressure in the sealed container can reach 0.75~1.65Mpa according to different gases. The pressure bearing capacity of the furnace and flue gas channel of the water tube boiler is generally only a few hundred to a few thousand millimeters of water column. Consider high pressure. Therefore, the explosion of the mixed gas will cause great damage to the enclosure structure of the boiler flue gas channel and the structure of the heating surface.
Gas explosion accidents in the furnace and flue of oil-fired gas-fired boilers have occurred frequently at home and abroad. In the slightest, it will cause the boiler to explode and flameout, and in severe cases, the furnace and flue will burst, the induced draft fan will be damaged, the boiler room and the chimney will be damaged, and even casualties will be caused.
To analyze and find out the cause of the accident, it is because there is an explosive mixed gas in the furnace or flue, which reaches the explosion limit, and is ignited by an open flame or the high temperature of the boiler itself, and the accident occurs.
Among all accidents, the most accidents occurred during boiler ignition, accounting for more than 50% of oil-fired boiler explosion accidents and more than 70% of gas-fired boiler explosion accidents.
Before the boiler is ignited, when the fuel gas leaks into the furnace due to some reasons, such as the valve is not sealed, misoperation, one-time ignition is not successful, etc., and the furnace flue has not been purged or the time for purging is not enough, and the air volume is insufficient, then It will explode when ignited.
During the operation of the boiler, there are many explosion accidents caused by flameout, and there are many oil-fired boilers, because the possibility of flameout of the oil-fired boiler is relatively high. Such accidents of gas-fired boilers mostly occur when the gas pressure or wind pressure fluctuates too much in front of the burner, causing defiring or tempering.
For boilers operating under negative pressure, when the boiler burns poorly, combustible gas enters the rear flue of the boiler and mixes with the air leaking in from the rear flue to form explosive gas, which may cause secondary combustion or explosion under high temperature.
It can be seen from the above that to prevent the furnace or flue from exploding, first of all, fuel should be prevented from entering the furnace when there is no open flame in the furnace, and secondly, good combustion must be ensured. As a precautionary measure, the furnace and flue must be carefully purged before ignition, so that the flammable gas that may accumulate in it can be removed in time.
From the safety point of view, the automation of the fuel gas boiler combustion system is necessary, including ignition pre-purge, ignition program control, flame detection, flameout protection, combustion automatic adjustment, etc. And all this comes standard with a modulating combustion system.
5. Comparison of imported burners and domestic burners:
1. The professional manufacturer of imported burners has experienced decades of design and production experience. The products have gone through a long process from design to test and then back to design and improvement. The products produced are very mature. For example, imported products have more than ten series and more than five hundred models, while domestic burners started relatively late, and the products are still in the imitation stage.
2. Don't say that there is a big gap between imported burners and domestic burners. There is also a big gap between imported burners produced by some non-professional manufacturers and imported burners produced by professional manufacturers. Changzhou Huayuan Leidis is a joint venture between Italy and China. After eight years of operation, the imported Italian boilers are equipped with burners. Due to many combustion failures, one of them has been scrapped and replaced with a domestic boiler with imported burners. After more than a year of operation, the response has been good, and it has basically achieved trouble-free operation. Calculated according to the loss caused by the failure, its hourly output is 7 million yuan, and the imported products have recovered immeasurable economic losses for customers. Take the user's own words: With these losses, several burners were bought back.
3. As far as the product itself is concerned, the main differences are as follows:
(1) All accessories of the burner produced by imported professional manufacturers are European products. Burner failure rate is low.
(2) The mechanical and electrical integration of the product is relatively complete, and the degree of automation is high.
(3) The control system is advanced and mature.
(4) It is convenient for maintenance, no need to screw the screw when changing the gun, and it can be put into operation within five minutes.
(5) Oil products have a wide range of applications, regardless of "coarse grains" or "fine grains", they will suit your taste, and you will not be picky about food.
(6) The combustion efficiency is high, and the flue gas emission is designed according to the European standard.
(7) The atomization effect is good, the atomized particles are between "30υ~50υ", the boiler does not accumulate dust, not to mention no carbon accumulation.