The shape of the flame is determined by four concepts: width, length, narrowness, and shortness. When designing the pillard burner in our factory, the manufacturer designs the best flame shape according to the pulverized coal quality analysis report provided by our factory. ) position (the ventilation cross-sectional area of each air duct is at the 0, 0 position, the ventilation volume is the largest), at this time, the ideal flame shape can be obtained, complete and powerful. The structure of the burner is shown in the figure:
The burner adjusts the shape of the flame by adjusting the ventilation cross-sectional area of each pipe. At (0, 0), the ventilation cross-sectional area of the axial wind and axial flow reaches the maximum, and a reasonable air volume can be obtained by adjusting the air volume. outlet wind speed.
The width and length of the flame are determined by the air volume and wind speed of the axial flow wind. Generally speaking, the increase of the wind speed and air volume of the axial flow wind (when the axial wind does not move) will result in a wide and long flame. The flame, the increase of the wind speed and air volume of the axial wind (in the case of the axial wind not moving), will get a narrow and short flame, and the shape of the flame is determined by the mutual influence of the axial wind and the axial wind. The expected flame shape is obtained through constraints. The stability of the flame shape is achieved through the central wind. The air volume of the central wind cannot be too large or too small. It needs to be within a reasonable range to achieve the purpose of stabilizing the flame. For our factory, it is ideal that the pressure of the central air should be controlled between 60mbar~80mbar, the axial flow air should be 240mbar~260mbar, the axial wind should be 230mbar~250mbar, and the cross-sectional area of each air duct should not be less than 90%. Next, adjust each parameter. For all the above adjustments, in order to change the flame shape, a stable primary air outlet pressure is required to maintain it. By stabilizing the total pressure of the burner, changing the ventilation cross-sectional area of each branch pipe can achieve the purpose of changing the flame shape. The specific flame shape changes are as follows:
When adjusting the shape of the flame, it is necessary to avoid going to extremes. When the flame is too thick, it will be very long and soft. When the flame is too thin, the flame will be too short. The firing zone requires the flame to have a certain length, width, position and temperature, and to ensure that the shape of the flame is complete, lively and powerful. This requires our long-term observation and summarization of experience.
The following summarizes the trend of flame shape through the change of coal quality:
(1) When the coal ash content becomes higher, the combustion speed of coal powder becomes slower, the flame becomes longer, and the combustion zone of the flame becomes longer. How to adjust the flame to make it calcined in the best state should be considered from the following points: (1) Increase the temperature of the secondary air or use more secondary air to enhance the degree of mixing of the primary air and secondary air with pulverized coal (2) Reduce the fineness and moisture of pulverized coal (3) Change the axial wind and axial The air volume ratio of the flow air (4) Increase the air volume of the primary air and reduce the concentration of pulverized coal in the primary and secondary air
(2) When the volatile content of coal becomes higher, the pulverized coal will ignite quickly, and the oxygen concentration around the coke particles will decrease, which will easily form a flame that is close to the kiln head, the temperature is low, and the high temperature part becomes longer. At this time, it should be from the following points Consider adjusting the shape of the flame: (1) increase the oxygen concentration around the flame (2) increase the air volume and wind speed of the axial wind (in the state of the original flame) (3) increase the primary air volume
(3) When the moisture content of the coal increases, the moisture content of the coal can be divided into internal water and external water. The moisture content of the external water can be reduced by appropriately increasing the gas temperature at the outlet of the mill, while the internal water needs to be around 110°C to Evaporation is very difficult for coal mills to reduce the internal water content. The coal powder with high internal water enters the kiln through the burner, the flame will become longer, the burning speed will be slower, the flame temperature will be lower, and the black fire head will become longer. At this time It should be considered to appropriately increase the combustion-supporting effect of the secondary air on the flame, increase the air volume mixing of the secondary air and the primary air; To achieve the purpose of increasing the flame temperature.
The following is a brief discussion on the influence of the position of the burner on the kiln condition:
Generally speaking, during installation, the center point of the burner is at the same point as the center point of the cross-section of the kiln when it is in a horizontal position, and the position of the burner should be corrected and checked once before the end of each inspection. During normal production, How to judge whether the position of the burner is correct or not, the author will briefly talk about how to adjust the position of the burner during calcination based on his own experience.
(1) Seen from the kiln surface, the shape of the flame should be complete, powerful and lively. It should not wash away the kiln skin, nor allow the flame to withstand the calcining of the material. Under normal circumstances, the outer flame of the flame should be consistent with the material brought up in the kiln. Contact, if the position of the burner is too high, the flame will wash to the kiln shell, the local temperature of the cylinder will be high, which will reduce the service life of the kiln lining, and the kiln shell of the firing zone will extend backwards, the thermal system in the kiln When the disorder is serious, the kiln will turn into a red kiln soon after feeding and calcining. At this time, the burner should be adjusted appropriately to make it close to the direction of the material, so that the outer flame of the flame can contact the material. If the position of the burner is too close to the material, the flame will burn. Withstand the material and impact it into the material, causing the top fire to force the burning, the incompletely burned coal powder is wrapped in the tumbling material, the burning zone has a severe reducing atmosphere, and the trivalent iron in the material is reduced to bivalent iron, forming yellow center material, reducing the quality of clinker, and the gas in the kiln with severe reducing atmosphere is brought into the preheater system, and the material entering the preheater is mixed with the reducing gas to reduce the temperature of the liquid phase of the material, so that the preheater system is crusted , or even blockage, affecting the normal calcination of the kiln. At this time, the burner should be properly adjusted to be far away from the material to make the flame smooth and powerful.
(2) Scanning on the central control tube can be more intuitive and convenient. (schematic diagram)
Kiln head 1# tire (4.3m) 2# tire (29.1m) 3# tire (58m) Kiln tail
direction direction
(1) Looking at the barrel scan, the length of the kiln skin in the firing zone should be between 20m and 25m, the temperature of the barrel is evenly distributed, there is no high temperature point, the temperature is 300°C~350°C, and the barrel temperature in the transition zone is 350°C Left and right, the flame at this time is complete, lively and smooth, the position of the burner is more appropriate, and the fired clinker is also in an ideal state, as shown in Figure (1).
(2) If viewed from the barrel, the temperature at the front is high, but the temperature at the back of the burning zone is normal, indicating that the position of the burner is far away from the material, or the flame may be forked, scattered, and the firepower is not concentrated; After forming the belt, the temperature is lower, the size of the clinker produced is different, and the granulation is uneven, which means that the burner is at a low position with respect to the y-axis at this time, as shown in Figure (2). If the temperature is still high after the firing zone, especially after the 2# tire, the cylinder temperature is high, even above 380°C, which means that the burner is at a high position with respect to the y-axis at this time, as shown in Figure (3).
(3) If viewed from the cylinder, the temperature in the firing zone is low and the temperature in the transition zone is not high, which means that the kiln skin in the firing zone is thicker, the burner is close to the material, and the clinker is crushed or granulated clinker After being crushed by knocking, there is yellow heart material inside, and the flame is not smooth, and the flame "plants" into the material, as shown in Figure (4).
The above are just a few typical unreasonable states of the position of the burner. After adjustment, you can find a suitable position to adapt to the calcination of the kiln, and get the ideal flame shape and ideal kiln skin. After long-term exploration, our factory has made It is always in the position of (1), the service life of the refractory material in the firing zone has reached 16 months, and the thickness is still about 140mm.
Concentration (2) Increase the air volume and wind speed of the axial wind (in the state of the original flame) (3) Increase the primary air volume
(3) When the moisture content of the coal increases, the moisture content of the coal can be divided into internal water and external water. The moisture content of the external water can be reduced by appropriately increasing the gas temperature at the outlet of the mill, while the internal water needs to be around 110°C to Evaporation is very difficult for coal mills to reduce the internal water content. The coal powder with high internal water enters the kiln through the burner, the flame will become longer, the burning speed will be slower, the flame temperature will be lower, and the black fire head will become longer. At this time It should be considered to appropriately increase the combustion-supporting effect of the secondary air on the flame, increase the air volume mixing of the secondary air and the primary air; To achieve the purpose of increasing the flame temperature.
The following is a brief discussion on the influence of the position of the burner on the kiln condition:
Generally speaking, during installation, the center point of the burner is at the same point as the center point of the cross-section of the kiln when it is in a horizontal position, and the position of the burner should be corrected and checked once before the end of each inspection. During normal production, How to judge whether the position of the burner is correct or not, the author will briefly talk about how to adjust the position of the burner during calcination based on his own experience.
(1) Seen from the kiln surface, the shape of the flame should be complete, powerful and lively. It should not wash away the kiln skin, nor allow the flame to withstand the calcining of the material. Under normal circumstances, the outer flame of the flame should be consistent with the material brought up in the kiln. Contact, if the position of the burner is too high, the flame will wash to the kiln shell, the local temperature of the cylinder will be high, which will reduce the service life of the kiln lining, and the kiln shell of the firing zone will extend backwards, the thermal system in the kiln When the disorder is serious, the kiln will turn into a red kiln soon after feeding and calcining. At this time, the burner should be adjusted appropriately to make it close to the direction of the material, so that the outer flame of the flame can contact the material. If the position of the burner is too close to the material, the flame will burn. Withstand the material and impact it into the material, causing the top fire to force the burning, the incompletely burned coal powder is wrapped in the tumbling material, the burning zone has a severe reducing atmosphere, and the trivalent iron in the material is reduced to bivalent iron, forming yellow center material, reducing the quality of clinker, and the gas in the kiln with severe reducing atmosphere is brought into the preheater system, and the material entering the preheater is mixed with the reducing gas to reduce the temperature at which the liquid phase of the material appears, so that the preheater system is crusted , or even blockage, affecting the normal calcination of the kiln. At this time, the burner should be properly adjusted to be far away from the material to make the flame smooth and powerful.
(2) Scanning on the central control tube can be more intuitive and convenient. (schematic diagram)
Kiln head 1# tire (4.3m) 2# tire (29.1m) 3# tire (58m) Kiln tail
direction direction
(1) Looking at the barrel scan, the length of the kiln skin in the firing zone should be between 20m and 25m, the temperature of the barrel is evenly distributed, there is no high temperature point, the temperature is 300°C~350°C, and the barrel temperature in the transition zone is 350°C Left and right, the flame at this time is complete, lively and smooth, the position of the burner is more appropriate, and the fired clinker is also in an ideal state, as shown in Figure (1).
(2) If viewed from the barrel, the temperature at the front is high, but the temperature at the back of the burning zone is normal, indicating that the position of the burner is far away from the material, or the flame may be forked, scattered, and the firepower is not concentrated; After forming the belt, the temperature is lower, the size of the clinker produced is different, and the granulation is uneven, which means that the burner is at a low position with respect to the y-axis at this time, as shown in Figure (2). If the temperature is still high after the firing zone, especially after the 2# tire, the cylinder temperature is high, even above 380°C, which means that the burner is at a high position with respect to the y-axis at this time, as shown in Figure (3).
(3) If viewed from the cylinder, the temperature in the firing zone is low and the temperature in the transition zone is not high, which means that the kiln skin in the firing zone is thicker, the burner is close to the material, and the clinker is crushed or granulated clinker After being crushed by knocking, there is yellow heart material inside, and the flame is not smooth, and the flame "plants" into the material, as shown in Figure (4).
The above are just a few typical unreasonable positions of the burner. After adjustment, you can find a suitable position to adapt to the calcination of the kiln, and get the ideal flame shape and ideal kiln skin. After long-term exploration, our factory has made It is always in the position of (1), the service life of the refractory material in the firing zone has reached 16 months, and the thickness is still about 140mm.
The shape of the flame is determined by four concepts: width, length, narrowness, and shortness. When designing the pillard burner in our factory, the manufacturer designs the best flame shape according to the pulverized coal quality analysis report provided by our factory. ) position (the ventilation cross-sectional area of each air duct is at the 0, 0 position, the ventilation volume is the largest), at this time, the ideal flame shape can be obtained, complete and powerful. The structure of the burner is shown in the figure:
The burner adjusts the shape of the flame by adjusting the ventilation cross-sectional area of each pipe. At (0, 0), the ventilation cross-sectional area of the axial wind and axial flow reaches the maximum, and a reasonable air volume can be obtained by adjusting the air volume. outlet wind speed.
The width and length of the flame are determined by the air volume and wind speed of the axial flow wind. Generally speaking, the increase of the wind speed and air volume of the axial flow wind (when the axial wind does not move) will result in a wide and long flame. The flame, the increase of the wind speed and air volume of the axial wind (in the case of the axial wind not moving), will get a narrow and short flame, and the shape of the flame is determined by the mutual influence of the axial wind and the axial wind. The expected flame shape is obtained through constraints. The stability of the flame shape is achieved through the central wind. The air volume of the central wind cannot be too large or too small. It needs to be within a reasonable range to achieve the purpose of stabilizing the flame. For our factory, it is ideal that the pressure of the central air should be controlled between 60mbar~80mbar, the axial flow air should be 240mbar~260mbar, the axial wind should be 230mbar~250mbar, and the cross-sectional area of each air duct should not be less than 90%. Next, adjust each parameter. For all the above adjustments, in order to change the flame shape, a stable primary air outlet pressure is required to maintain it. By stabilizing the total pressure of the burner, changing the ventilation cross-sectional area of each branch pipe can achieve the purpose of changing the flame shape. The specific flame shape changes are as follows:
When adjusting the shape of the flame, it is necessary to avoid going to extremes. When the flame is too thick, it will be very long and soft. When the flame is too thin, the flame will be too short. The firing zone requires the flame to have a certain length, width, position and temperature, and to ensure that the shape of the flame is complete, lively and powerful. This requires our long-term observation and summarization of experience.
The following summarizes the trend of flame shape through the change of coal quality:
(1) When the coal ash content becomes higher, the combustion speed of coal powder becomes slower, the flame becomes longer, and the combustion zone of the flame becomes longer. How to adjust the flame to make it calcined in the best state should be considered from the following points: (1) Increase the temperature of the secondary air or use more secondary air to enhance the degree of mixing of the primary air and secondary air with pulverized coal (2) Reduce the fineness and moisture of pulverized coal (3) Change the axial wind and axial The air volume ratio of the flow air (4) Increase the air volume of the primary air and reduce the concentration of pulverized coal in the primary and secondary air
(2) When the volatile content of coal becomes higher, the pulverized coal will ignite quickly, and the oxygen concentration around the coke particles will decrease, which will easily form a flame that is close to the kiln head, the temperature is low, and the high temperature part becomes longer. At this time, it should be from the following points Consider adjusting the shape of the flame: (1) increase the oxygen concentration around the flame (2) increase the air volume and wind speed of the axial wind (in the state of the original flame) (3) increase the primary air volume
(3) When the moisture content of the coal increases, the moisture content of the coal can be divided into internal water and external water. The moisture content of the external water can be reduced by appropriately increasing the gas temperature at the outlet of the mill, while the internal water needs to be around 110°C to Evaporation is very difficult for coal mills to reduce the internal water content. The coal powder with high internal water enters the kiln through the burner, the flame will become longer, the burning speed will be slower, the flame temperature will be lower, and the black fire head will become longer. At this time It should be considered to appropriately increase the combustion-supporting effect of the secondary air on the flame, increase the air volume mixing of the secondary air and the primary air; To achieve the purpose of increasing the flame temperature.
The following is a brief discussion on the influence of the position of the burner on the kiln condition:
Generally speaking, during installation, the center point of the burner is at the same point as the center point of the cross-section of the kiln when it is in a horizontal position, and the position of the burner should be corrected and checked once before the end of each inspection. During normal production, How to judge whether the position of the burner is correct or not, the author will briefly talk about how to adjust the position of the burner during calcination based on his own experience.
(1) Seen from the kiln surface, the shape of the flame should be complete, powerful and lively. It should not wash away the kiln skin, nor allow the flame to withstand the calcining of the material. Under normal circumstances, the outer flame of the flame should be consistent with the material brought up in the kiln. Contact, if the position of the burner is too high, the flame will wash to the kiln shell, the local temperature of the cylinder will be high, which will reduce the service life of the kiln lining, and the kiln shell of the firing zone will extend backwards, the thermal system in the kiln When the disorder is serious, the kiln will turn into a red kiln soon after feeding and calcining. At this time, the burner should be adjusted appropriately to make it close to the direction of the material, so that the outer flame of the flame can contact the material. If the position of the burner is too close to the material, the flame will burn. Withstand the material and impact it into the material, causing the top fire to force the burning, the incompletely burned coal powder is wrapped in the tumbling material, the burning zone has a severe reducing atmosphere, and the trivalent iron in the material is reduced to bivalent iron, forming yellow center material, reducing the quality of clinker, and the gas in the kiln with severe reducing atmosphere is brought into the preheater system, and the material entering the preheater is mixed with the reducing gas to reduce the temperature of the liquid phase of the material, so that the preheater system is crusted , or even blockage, affecting the normal calcination of the kiln. At this time, the burner should be properly adjusted to be far away from the material to make the flame smooth and powerful.
(2) Scanning on the central control tube can be more intuitive and convenient. (schematic diagram)
Kiln head 1# tire (4.3m) 2# tire (29.1m) 3# tire (58m) Kiln tail
direction direction
(1) Looking at the barrel scan, the length of the kiln skin in the firing zone should be between 20m and 25m, the temperature of the barrel is evenly distributed, there is no high temperature point, the temperature is 300°C~350°C, and the barrel temperature in the transition zone is 350°C Left and right, the flame at this time is complete, lively and smooth, the position of the burner is more appropriate, and the fired clinker is also in an ideal state, as shown in Figure (1).
(2) If viewed from the barrel, the temperature at the front is high, but the temperature at the back of the burning zone is normal, indicating that the position of the burner is far away from the material, or the flame may be forked, scattered, and the firepower is not concentrated; After forming the belt, the temperature is lower, the size of the clinker produced is different, and the granulation is uneven, which means that the burner is at a low position with respect to the y-axis at this time, as shown in Figure (2). If the temperature is still high after the firing zone, especially after the 2# tire, the cylinder temperature is high, even above 380°C, which means that the burner is at a high position with respect to the y-axis at this time, as shown in Figure (3).
(3) If viewed from the cylinder, the temperature in the firing zone is low and the temperature in the transition zone is not high, which means that the kiln skin in the firing zone is thicker, the burner is close to the material, and the clinker is crushed or granulated clinker After being crushed by knocking, there is yellow heart material inside, and the flame is not smooth, and the flame "plants" into the material, as shown in Figure (4).
The above are just a few typical unreasonable states of the position of the burner. After adjustment, you can find a suitable position to adapt to the calcination of the kiln, and get the ideal flame shape and ideal kiln skin. After long-term exploration, our factory has made It is always in the position of (1), the service life of the refractory material in the firing zone has reached 16 months, and the thickness is still about 140mm.
Concentration (2) Increase the air volume and wind speed of the axial wind (in the state of the original flame) (3) Increase the primary air volume
(3) When the moisture content of the coal increases, the moisture content of the coal can be divided into internal water and external water. The moisture content of the external water can be reduced by appropriately increasing the gas temperature at the outlet of the mill, while the internal water needs to be around 110°C to Evaporation is very difficult for coal mills to reduce the internal water content. The coal powder with high internal water enters the kiln through the burner, the flame will become longer, the burning speed will be slower, the flame temperature will be lower, and the black fire head will become longer. At this time It should be considered to appropriately increase the combustion-supporting effect of the secondary air on the flame, increase the air volume mixing of the secondary air and the primary air; To achieve the purpose of increasing the flame temperature.
The following is a brief discussion on the influence of the position of the burner on the kiln condition:
Generally speaking, during installation, the center point of the burner is at the same point as the center point of the cross-section of the kiln when it is in a horizontal position, and the position of the burner should be corrected and checked once before the end of each inspection. During normal production, How to judge whether the position of the burner is correct or not, the author will briefly talk about how to adjust the position of the burner during calcination based on his own experience.
(1) Seen from the kiln surface, the shape of the flame should be complete, powerful and lively. It should not wash away the kiln skin, nor allow the flame to withstand the calcining of the material. Under normal circumstances, the outer flame of the flame should be consistent with the material brought up in the kiln. Contact, if the position of the burner is too high, the flame will wash to the kiln shell, the local temperature of the cylinder will be high, which will reduce the service life of the kiln lining, and the kiln shell of the firing zone will extend backwards, the thermal system in the kiln When the disorder is serious, the kiln will turn into a red kiln soon after feeding and calcining. At this time, the burner should be adjusted appropriately to make it close to the direction of the material, so that the outer flame of the flame can contact the material. If the position of the burner is too close to the material, the flame will burn. Withstand the material and impact it into the material, causing the top fire to force the burning, the incompletely burned coal powder is wrapped in the tumbling material, the burning zone has a severe reducing atmosphere, and the trivalent iron in the material is reduced to bivalent iron, forming yellow center material, reducing the quality of clinker, and the gas in the kiln with severe reducing atmosphere is brought into the preheater system, and the material entering the preheater is mixed with the reducing gas to reduce the temperature at which the liquid phase of the material appears, so that the preheater system is crusted , or even blockage, affecting the normal calcination of the kiln. At this time, the burner should be properly adjusted to be far away from the material to make the flame smooth and powerful.
(2) Scanning on the central control tube can be more intuitive and convenient. (schematic diagram)
Kiln head 1# tire (4.3m) 2# tire (29.1m) 3# tire (58m) Kiln tail
direction direction
(1) Looking at the barrel scan, the length of the kiln skin in the firing zone should be between 20m and 25m, the temperature of the barrel is evenly distributed, there is no high temperature point, the temperature is 300°C~350°C, and the barrel temperature in the transition zone is 350°C Left and right, the flame at this time is complete, lively and smooth, the position of the burner is more appropriate, and the fired clinker is also in an ideal state, as shown in Figure (1).
(2) If viewed from the barrel, the temperature at the front is high, but the temperature at the back of the burning zone is normal, indicating that the position of the burner is far away from the material, or the flame may be forked, scattered, and the firepower is not concentrated; After forming the belt, the temperature is lower, the size of the clinker produced is different, and the granulation is uneven, which means that the burner is at a low position with respect to the y-axis at this time, as shown in Figure (2). If the temperature is still high after the firing zone, especially after the 2# tire, the cylinder temperature is high, even above 380°C, which means that the burner is at a high position with respect to the y-axis at this time, as shown in Figure (3).
(3) If viewed from the cylinder, the temperature in the firing zone is low and the temperature in the transition zone is not high, which means that the kiln skin in the firing zone is thicker, the burner is close to the material, and the clinker is crushed or granulated clinker After being crushed by knocking, there is yellow heart material inside, and the flame is not smooth, and the flame "plants" into the material, as shown in Figure (4).
The above are just a few typical unreasonable positions of the burner. After adjustment, you can find a suitable position to adapt to the calcination of the kiln, and get the ideal flame shape and ideal kiln skin. After long-term exploration, our factory has made It is always in the position of (1), the service life of the refractory material in the firing zone has reached 16 months, and the thickness is still about 140mm.