1. The greater the negative pressure in the furnace, the better
If the boiler burner is not designed to operate under negative pressure, coal, ash, smoke, and sparks will inevitably appear around the boiler burner, thereby polluting the working environment. But this does not mean that the greater the negative pressure, the better. If the negative pressure in the furnace is too large, first, the power consumption of the fan will increase; second, the furnace leakage will increase, and the thermal economy of the boiler burner will decrease, which is not conducive to energy saving.
2. The pressure of the furnace has nothing to do with safety
Whether the kiln pressure is normal has a considerable impact on equipment and personal safety. Excessive negative pressure will increase the wear of the smoke pipe and the tail convection pipe wall, such as the superheater and economizer, and the wear amount is dozens of times greater than that in normal operation. Over time, the convection pipe wall will wear and become thinner, the main steam temperature will be too high, and accidents such as tube overburden will occur. Positive pressure combustion (except for oil burners) is more harmful to the safe operation of boiler burners, mainly the following.
(1) The working conditions of the heating surface and grate deteriorate;
(2) The furnace door and steel frame are deformed, and the furnace wall cracks;
(3) Increased wear of the convection tube wall;
(4) The metal tube wall is overheated, destroying the water circulation;
(5) It is easy to cause the pipeline to expand and leak;
(6) The steam contains a large amount of water, which makes the steam quality worse and causes water shock;
(7) Aggravates the corrosion of the heated surface.
3. The more regular the sewage discharge, the better
Regular sewage discharge mainly refers to removing the slag, dirt and corrosion products at the bottom of the boiler burner, reducing the scaling of the furnace tube, preventing blockage, reducing the salt content of the boiler water, and enhancing the heat transfer effect.
4. The less water in the fuel, the better
It is generally introduced in textbooks that water in the fuel is a harmful component and an impurity in the fuel. Water will absorb the heat generated during the combustion of the fuel, increase the loss of exhaust gas smoke, and make it difficult to feed coal into the coal powder. If there is water in the fuel oil, it will cause the flame to pulsate and the combustion to be unstable, and even the boiler burner will extinguish the fire, so some people think that the less water in the fuel, the better. In fact, this is very wrong.
5. The longer the pickling time, the better
Generally speaking, the inner wall of the boiler burner can be divided into three layers after a period of use: scale layer, rust layer (Fe3O4, Fe2O3 and FeO) and iron matrix (Fe) layer. The purpose of pickling is to remove the scale layer and rust layer (Fe3O4, Fe2O3 and FeO) on the inner wall of the boiler that cannot be washed away by high-pressure water through chemical reaction, so as to achieve enhanced heat transfer effect and maintain the high thermal efficiency of the boiler burner. However, hydrochloric acid, sulfuric acid and phosphoric acid used for pickling can remove scale and oxidized rust layer, but will inevitably attack the iron matrix (Fe) layer, because the accumulation of oxidized rust layer is uneven, and pit corrosion and oxidation of metal matrix are common.
6. Leakage is not harmful to the operation of boiler burner
Some people think that the leakage of boiler burner can reduce the gas supply of boiler burner, which is not only harmless but also energy-saving. This is a very wrong understanding.
1. The greater the negative pressure in the furnace, the better
If the boiler burner is not designed to operate under negative pressure, coal, ash, smoke, and sparks will inevitably appear around the boiler burner, thereby polluting the working environment. But this does not mean that the greater the negative pressure, the better. If the negative pressure in the furnace is too large, first, the power consumption of the fan will increase; second, the furnace leakage will increase, and the thermal economy of the boiler burner will decrease, which is not conducive to energy saving.
2. The pressure of the furnace has nothing to do with safety
Whether the kiln pressure is normal has a considerable impact on equipment and personal safety. Excessive negative pressure will increase the wear of the smoke pipe and the tail convection pipe wall, such as the superheater and economizer, and the wear amount is dozens of times greater than that in normal operation. Over time, the convection pipe wall will wear and become thinner, the main steam temperature will be too high, and accidents such as tube overburden will occur. Positive pressure combustion (except for oil burners) is more harmful to the safe operation of boiler burners, mainly the following.
(1) The working conditions of the heating surface and grate deteriorate;
(2) The furnace door and steel frame are deformed, and the furnace wall cracks;
(3) Increased wear of the convection tube wall;
(4) The metal tube wall is overheated, destroying the water circulation;
(5) It is easy to cause the pipeline to expand and leak;
(6) The steam contains a large amount of water, which makes the steam quality worse and causes water shock;
(7) Aggravates the corrosion of the heated surface.
3. The more regular the sewage discharge, the better
Regular sewage discharge mainly refers to removing the slag, dirt and corrosion products at the bottom of the boiler burner, reducing the scaling of the furnace tube, preventing blockage, reducing the salt content of the boiler water, and enhancing the heat transfer effect.
4. The less water in the fuel, the better
It is generally introduced in textbooks that water in the fuel is a harmful component and an impurity in the fuel. Water will absorb the heat generated during the combustion of the fuel, increase the loss of exhaust gas smoke, and make it difficult to feed coal into the coal powder. If there is water in the fuel oil, it will cause the flame to pulsate and the combustion to be unstable, and even the boiler burner will extinguish the fire, so some people think that the less water in the fuel, the better. In fact, this is very wrong.
5. The longer the pickling time, the better
Generally speaking, the inner wall of the boiler burner can be divided into three layers after a period of use: scale layer, rust layer (Fe3O4, Fe2O3 and FeO) and iron matrix (Fe) layer. The purpose of pickling is to remove the scale layer and rust layer (Fe3O4, Fe2O3 and FeO) on the inner wall of the boiler that cannot be washed away by high-pressure water through chemical reaction, so as to achieve enhanced heat transfer effect and maintain the high thermal efficiency of the boiler burner. However, hydrochloric acid, sulfuric acid and phosphoric acid used for pickling can remove scale and oxidized rust layer, but will inevitably attack the iron matrix (Fe) layer, because the accumulation of oxidized rust layer is uneven, and pit corrosion and oxidation of metal matrix are common.
6. Leakage is not harmful to the operation of boiler burner
Some people think that the leakage of boiler burner can reduce the gas supply of boiler burner, which is not only harmless but also energy-saving. This is a very wrong understanding.