An online monitoring system for zero-pressure surface in a clinker grate cooler and an intelligent adjustment response system for zero-pressure surface and a control method thereof

Abstract

The present invention relates to an online monitoring system for zero-pressure surface in a clinker grate cooler and an intelligent adjustment and response system for zero-pressure surface and a control method thereof, comprising a clinker firing system, a kiln head hood and a grate cooler arranged in sequence along the material path; further comprising a high-temperature fan, a cooling fan, a kiln head waste gas treatment system and a kiln head exhaust fan; a flow detection device is also provided at the air inlet of each cooling fan, a first pressure detection device is also provided on the grate cooler housing, and a second pressure detection device is also provided on the kiln head hood; further comprising an adjustment and response module, which is electrically connected to each flow detection device, the first pressure detection device and the second pressure detection device; the present invention effectively optimizes the control parameters of the high-temperature fan and the kiln head exhaust fan of the firing system to accurately guide the rational use of air in each functional area and accurately control the negative pressure of the kiln head hood, thereby creating reliable conditions for improving the technical indicators of the firing system.

Description

Technical Field

[0001] The invention relates to an online monitoring system for zero-pressure surface in a clinker grate cooler and a zero-pressure surface intelligent adjustment response system and a control method thereof. Background Art

[0002] At present, in the operation of cement kiln systems, the negative pressure of the kiln head hood is mostly controlled by a simple control loop established with the kiln head exhaust fan; however, this control method does not take into account factors such as whether the parameters of the high-temperature fan of the kiln system are reasonable, whether the operating parameters of the air supply fan corresponding to the secondary air and tertiary air intake areas of the cooler are reasonable, etc.; in fact, the negative pressure of the kiln head hood is affected by the interaction between the high-temperature fan and the kiln head exhaust fan. In other words, a high negative pressure in the kiln head hood may be caused by unreasonable and excessive air pulling by the high-temperature fan, or by excessive air pulling by the kiln head exhaust fan. In addition, it is also related to the air volume of the cooling fan corresponding to the theoretical air supply area of ​​the secondary and tertiary air, the grate bed speed (affecting the thickness of the material layer), etc.

[0003] During the operation of the cement kiln system, a zero-pressure surface will be formed at a certain position inside the cooler; on the side of the zero-pressure surface close to the kiln, the air after heat exchange enters the kiln in the form of secondary and tertiary air, and on the other side of the zero-pressure surface (the side away from the kiln), the hot air enters the waste heat boiler; under the reasonable conditions of high-temperature fans, kiln head exhaust fans and cooler air supply methods, the zero-pressure surface position is the boundary of the air supply area that just meets the secondary and tertiary air volumes; if the operating parameters are unreasonable, the secondary and tertiary air volumes will not match the air used for the kiln head residual air (waste heat power generation).

[0004] When the high-temperature fan pulls too much air, the theoretical zero-pressure surface will be far away from the kiln mouth, that is, it will be further back than the boundary of the air supply area that just meets the secondary and tertiary air volumes, which means that the secondary and tertiary air volumes entering the kiln system will increase. Under the condition of a similar output of the kiln system, the secondary and tertiary air temperatures will be lower to a certain extent, and the system heat consumption will increase to a certain extent; when the kiln head exhaust fan pulls too much air, the theoretical zero-pressure surface will be close to the kiln mouth, which means that the secondary and tertiary air volumes entering the kiln system will be reduced, and the kiln head and the kiln system will compete for air; in this case, the secondary air temperature will be very high, but the secondary and tertiary air volumes entering the kiln will be reduced, which will have an adverse effect on the operation and heat consumption of the kiln system.

[0005] The existing control method for the negative pressure of the kiln head hood of the firing system is relatively simple: if the negative pressure of the kiln head hood is too low, the negative pressure of the head exhaust fan will be increased. The control method is relatively extensive and does not take into account the influence of factors such as changes in the working conditions of the grate cooler and the air pulling of the high-temperature fan. In order to control certain parameters within a reasonable range, many operating parameters are set unreasonably, which leads to the system operating energy consumption not reaching the ideal value, and urgently needs to be solved. Summary of the Invention

[0006] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide an online monitoring and intelligent adjustment response system for the zero-pressure surface in the clinker grate cooler and its control method, which effectively optimizes the control parameters of the high-temperature fan and the kiln head exhaust fan of the firing system to accurately guide the reasonable use of air in each functional area and accurately control the negative pressure of the kiln head hood, thereby creating reliable conditions for improving the technical indicators of the firing system.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: an online monitoring system for zero pressure surface in a clinker grate cooler and an intelligent adjustment response system for zero pressure surface, comprising a clinker burning system, a kiln head cover and a grate cooler arranged in sequence along the material path; further comprising a high-temperature fan, a cooling fan, a kiln head exhaust gas treatment system and a kiln head exhaust fan; the air inlet of the high-temperature fan is connected to the air outlet of the clinker burning system, the cooling fan comprises a plurality of cooling fans, and the plurality of cooling fans are sequentially arranged at the bottom of the grate cooler, and the air inlet of the kiln head exhaust gas treatment system is connected to the air outlet of the grate cooler. The air outlet is connected, and the air inlet of the kiln head exhaust fan is connected to the air outlet of the kiln head waste gas treatment system; a tertiary air intake is also provided on the top of the grate cooler, which is characterized in that a flow detection device is also provided at the air inlet of each cooling fan, a first pressure detection device is also provided on the grate cooler housing, and a second pressure detection device is also provided on the kiln head cover; and an adjustment response module is also included, and the adjustment response module is electrically connected to each flow detection device, the first pressure detection device and the second pressure detection device.

[0008] A method for controlling an online monitoring system of a zero-pressure surface in a clinker grate cooler and an intelligent adjustment and response system for the zero-pressure surface is characterized by comprising the following steps:

[0009] S1: Based on the core parameters of the kiln system such as the operating output and system coal consumption, calculate the total air volume Q1 required for the theoretical secondary and tertiary air and the cooling fan air volume Q2 corresponding to the theoretical secondary and tertiary air supply area:

[0010]

[0011] Among them, q Fi :Fi cooling fan 6 air volume;

[0012] Ai: Fi is the number of grate plates in the corresponding air chamber of the cooling fan;

[0013] ai: Fi is the number of grates in the theoretical air supply area of ​​the secondary and tertiary air in the air chamber corresponding to the cooling fan.

[0014] S2: The adjustment response module adjusts the air volume measured by the flow measurement devices on several cooling fans corresponding to the air supply area and the pressure P at points A, B, and C near the theoretical zero pressure surface measured by the first pressure detection device on the shell according to the secondary and tertiary wind theory of the system. A 、P B 、P CThe second pressure detection device on the kiln head cover measures the pressure P0 inside the kiln head cover. Through the strategy control model, the high temperature fan speed r is adjusted. ID , Kiln exhaust fan speed r EP , cooling fan speed r Fi , grate bed pushing speed r of grate cooler GP Parameters, maintain the zero pressure surface in the grate cooler at a reasonable position, maintain the negative pressure of the kiln head hood in an appropriate range, and stabilize the system operating conditions.

[0015] S3: Compare the theoretical total air volume Q1 of the secondary and tertiary air and the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the secondary and tertiary air; when Q1 and Q2 are roughly equal, the boundary of the cooling machine air supply area corresponding to Q2 can be considered as the position A of the theoretical zero pressure surface in the grate cooler, and set pressure measuring points B and C at the theoretical zero pressure surface and 1.5m before and after.

[0016] S4: According to the system operating conditions, the high temperature fan speed r ID , Kiln exhaust fan speed r EP , the cooling fan air volume Q2 corresponding to the secondary and tertiary air supply area, the cooling fan speed r corresponding to the secondary and tertiary air supply area Fi , grate bed pushing speed r GP , zero pressure surface and the negative pressure values ​​of nearby measuring points A, B, and C (P A 、P B 、P C ) and the kiln head hood negative pressure (P0) parameters are incorporated into the zero-pressure surface intelligent adjustment response system.

[0017] S5: Adjust the response module to the collected P A 、P B 、P C , P0 pressure data is processed by real-time mean filtering method, namely:

[0018]

[0019] Among them, P i Indicates the i-th value of the pressure variable after filtering, P j represents the real-time value of the pressure variable at time j, n is the cycle time parameter of the mean filter, and N is a set of natural numbers.

[0020] Preferably, the following situations exist in step S2:

[0021] (1) The negative pressure P0 of the kiln head cover increases, and the negative pressure P C Decrease, negative pressure P at point A A and negative pressure P at point B BIncreased, the cooling fan air volume Q2 corresponding to the secondary and tertiary air supply area is normal, which means that the zero pressure surface moves toward point C, which means that the high-temperature fan is pulling too much air, and the total secondary and tertiary air volume entering the kiln system is too large. Some of the low-temperature air in the rear section of the secondary and tertiary air supply area is introduced into the kiln by the high-temperature fan, which will cause the secondary and tertiary air temperatures to decrease and the energy consumption to increase. At this time, the high-temperature fan speed should be reduced.

[0022] (2) The negative pressure P0 of the kiln head cover increases, and the negative pressure P C Decrease, negative pressure P at point A A and negative pressure P at point B B Increased, the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the second and third air is low, it means that the zero pressure surface moves toward point C, it means that the cooler material layer becomes thicker, and the cooling fan air volume Q2 corresponding to the second and third air decreases. At this time, the grate bed speed should be increased or the cooling fan speed corresponding to the theoretical air supply area of ​​the second and third air should be increased.

[0023] (3) The negative pressure P0 of the kiln head cover decreases, and the negative pressure P B Decrease, negative pressure P at point A A and negative pressure P at point C C Increase, the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the second and third air increases, and the zero pressure surface moves toward point B, which means that the material layer of the cooler becomes thinner, and the cooling fan air volume Q2 corresponding to the second and third air increases. At this time, the grate bed speed should be reduced or the cooling fan speed corresponding to the theoretical air supply area of ​​the second and third air should be reduced.

[0024] (4) The negative pressure P0 of the kiln head cover increases, and the negative pressure P of measuring points A, B, and C increases. A 、P B and P C Increase, the cooling fan air volume Q2 corresponding to the secondary and tertiary air theoretical supply area is normal, and the zero-pressure surface is close to the kiln head, which means that the kiln head exhaust fan is pulling too much air, and the total secondary and tertiary air volume entering the kiln system is too small. At this time, the speed of the kiln head exhaust fan should be reduced.

[0025] Compared with the existing technology, the advantages of the present invention are: the present invention can adjust the kiln system air consumption in real time during the production and operation of the cement rotary kiln, and identify the theoretical zero-pressure surface of the cooler grate bed through the core parameters of the firing system operating conditions and parameters such as the cooling air volume, and then establish a reasonable range for identifying control parameters such as the high-temperature fan, head exhaust fan, cooling fan and grate cooler grate bed speed through the theoretical zero-pressure surface pressure, kiln head hood pressure, cooling air volume, etc., thereby effectively optimizing the control parameters of the high-temperature fan and kiln head exhaust fan of the firing system to accurately guide the reasonable air consumption of each functional area and accurately control the negative pressure of the kiln head hood, thereby creating reliable conditions for improving the technical indicators of the firing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 This is a control principle diagram of the present invention. DETAILED DESCRIPTION

[0028] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0030] like Figure 1 As shown, a zero-pressure surface online monitoring and zero-pressure surface intelligent adjustment response system in a clinker grate cooler comprises a clinker burning system 2, a kiln head cover 3 and a grate cooler 4 arranged in sequence along the material path; further comprising a high-temperature fan 1, a cooling fan 6, a kiln head exhaust gas treatment system 7 and a kiln head exhaust fan 8; the air inlet of the high-temperature fan 1 is connected to the air outlet of the clinker burning system 2, the cooling fan 6 comprises a plurality of cooling fans 6, and the plurality of cooling fans 6 are sequentially arranged at the bottom of the grate cooler 4, the air inlet of the kiln head exhaust gas treatment system 7 is connected to the air outlet of the grate cooler 4, and the air inlet of the kiln head exhaust fan 8 is connected to the air outlet of the kiln head exhaust gas treatment system 7; the top of the grate cooler 4 is also connected. A tertiary air intake 5 is provided; a flow detection device 9 is also provided at the air inlet of each cooling fan 6, a first pressure detection device 10 is also provided on the shell of the grate cooler 4, and a second pressure detection device 11 is also provided on the kiln head hood 3; it also includes an adjustment response module, which is electrically connected to each flow detection device 9, the first pressure detection device 10 and the second pressure detection device 11; the flow detection device 9 is used to detect the actual operating air volume of the cooling fan 6 on the grate cooler 4; the first pressure detection device 10 is used to detect the internal pressure of the cooler; the second pressure detection device 11 is used to detect the pressure inside the kiln head hood.

[0031] like Figure 2 As shown, a control method for online monitoring of zero-pressure surface in a clinker grate cooler and a zero-pressure surface intelligent adjustment response system includes the following steps:

[0032] S1: Based on the core parameters of the kiln system such as the operating output and system coal consumption, calculate the total air volume Q1 required for the theoretical secondary and tertiary air and the cooling fan air volume Q2 corresponding to the theoretical secondary and tertiary air supply area:

[0033] Q1 = f (kiln system output, system heat consumption, fuel calorific value)

[0034]

[0035] Among them, q Fi :Fi cooling fan 6 air volume;

[0036] Ai: Fi cooling fan 6 corresponds to the number of grate plates in the air chamber;

[0037] ai: Fi cooling fan 6 corresponds to the number of grates in the air chamber belonging to the secondary and tertiary air theoretical supply areas.

[0038] S2: The adjustment response module adjusts the air volume measured by the flow measurement device 9 on the cooling fans 6 corresponding to the air supply area and the pressure P at points A, B, and C near the theoretical zero pressure surface measured by the first pressure detection device 10 on the shell according to the secondary and tertiary wind theory of the system. A 、P B 、P C The pressure inside the kiln head cover P0 measured by the second pressure detection device 11 on the kiln head cover is adjusted and controlled by the strategy control model to adjust the speed r of the high temperature fan 1 ID , Kiln head exhaust fan 8 speed r EP , cooling fan 6 speed r Fi , grate bed pushing speed r of grate cooler 4 GP Parameters, maintain the zero pressure surface in the grate cooler at a reasonable position, maintain the negative pressure of the kiln head hood in an appropriate range, and stabilize the system operating conditions.

[0039] During production operation, the core parameters of the kiln system can be adjusted intelligently and accurately by utilizing the changes in the zero-pressure surface and the negative pressure of the kiln head hood. There are the following situations:

[0040] (1) The negative pressure P0 of kiln head cover 3 increases, and the negative pressure P of measuring point C increases. C Decrease, negative pressure P at point A A and negative pressure P at point B B Increased, the cooling fan air volume Q2 corresponding to the secondary and tertiary air supply area is normal, which means that the zero pressure surface moves toward point C, which means that the high-temperature fan 1 is pulling too much air, and the total secondary and tertiary air volume entering the kiln system is too large. Some of the low-temperature air in the rear section of the secondary and tertiary air supply area is introduced into the kiln by the high-temperature fan, which will cause the secondary and tertiary air temperatures to decrease and the energy consumption to increase. At this time, the speed of the high-temperature fan 1 should be reduced.

[0041] (2) The negative pressure P0 of the kiln head cover 3 increases, and the negative pressure P C Decrease, negative pressure P at point AA and negative pressure P at point B B Increased, the air volume Q2 of the cooling fan 6 corresponding to the theoretical air supply area of ​​the second and third air is low, it means that the zero pressure surface moves toward point C, it means that the material layer of the cooler becomes thicker, and the air volume Q2 of the cooling fan 6 corresponding to the second and third air is reduced. At this time, the speed of the grate bed 4 should be accelerated or the speed of the cooling fan 6 corresponding to the theoretical air supply area of ​​the second and third air should be increased.

[0042] (3) The negative pressure P0 of kiln head cover 3 decreases, and the negative pressure P B Decrease, negative pressure P at point A A and negative pressure P at point C C Increase, the cooling fan air volume Q2 corresponding to the secondary and tertiary air theoretical air supply area increases, and the zero pressure surface moves toward point B, which means that the cooler material layer becomes thinner, and the secondary and tertiary air corresponding to the cooling fan 6 air volume Q2 increases. At this time, the grate bed 4 speed should be reduced or the speed of the cooling fan 6 corresponding to the secondary and tertiary air theoretical air supply area should be reduced.

[0043] (4) The negative pressure P0 of kiln head cover 3 increases, and the negative pressure P of measuring points A, B, and C increases. A 、P B and P C Increase, the air volume Q2 of the cooling fan 6 corresponding to the secondary and tertiary air theoretical supply area is normal, and the zero-pressure surface is close to the kiln head, which means that the kiln head exhaust fan 8 is pulling too much air, and the total secondary and tertiary air volume entering the kiln system is small. At this time, the speed of the kiln head exhaust fan 8 should be reduced.

[0044] S3: Compare the theoretical total air volume Q1 of the secondary and tertiary air and the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the secondary and tertiary air; when Q1 and Q2 are roughly equal, the boundary of the cooling machine air supply area corresponding to Q2 can be considered as the position A of the theoretical zero pressure surface in the grate cooler, and set pressure measuring points B and C at the theoretical zero pressure surface and 1.5m before and after.

[0045] S4: According to the system operating conditions, the high temperature fan 1 speed r ID , Kiln head exhaust fan 8 speed r EP , cooling fan air volume Q2 corresponding to the second and third air theoretical supply area, cooling fan speed r6 corresponding to the second and third air theoretical supply area Fi , grate bed pushing speed r GP , zero pressure surface and the negative pressure values ​​of nearby measuring points A, B, and C (P A 、P B 、P C ), the negative pressure (P0) parameter of kiln head hood 3 is included in the zero pressure surface intelligent adjustment response system, see Figure 2 .

[0046] S5: Adjust the response module to the collected P A 、P B 、P C, P0 pressure data is processed by real-time mean filtering method, namely:

[0047]

[0048] Among them, P i Indicates the i-th value of the pressure variable after filtering, P j represents the real-time value of the pressure variable at time j, n is the cycle time parameter of the mean filter, and N is a set of natural numbers.

[0049] The present invention can adjust the air consumption of the kiln system during the production and operation of the cement rotary kiln in real time, and identify the theoretical zero-pressure surface of the cooler grate bed through the core parameters of the firing system working conditions and parameters such as the cooling air volume, and then establish a reasonable range for identifying control parameters such as the high-temperature fan, head exhaust fan, cooling fan and grate cooler grate bed speed through the theoretical zero-pressure surface pressure, kiln head hood pressure, cooling air volume, etc., thereby effectively optimizing the control parameters of the high-temperature fan and kiln head exhaust fan of the firing system to accurately guide the reasonable air consumption of each functional area and accurately control the negative pressure of the kiln head hood, thereby creating reliable conditions for improving the technical indicators of the firing system.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A control method for online monitoring of zero-pressure surface in a clinker grate cooler and a zero-pressure surface intelligent adjustment response system, characterized in that: The system includes a clinker burning system, a kiln head hood and a grate cooler arranged in sequence along the material path; it also includes a high-temperature fan, a cooling fan, a kiln head exhaust gas treatment system and a kiln head exhaust fan; the air inlet of the high-temperature fan is connected to the air outlet of the clinker burning system, the cooling fan includes multiple cooling fans, and the multiple cooling fans are sequentially arranged at the bottom of the grate cooler, the air inlet of the kiln head exhaust gas treatment system is connected to the air outlet of the grate cooler, and the air inlet of the kiln head exhaust fan is connected to the air outlet of the kiln head exhaust gas treatment system; a tertiary air intake is also provided at the top of the grate cooler, characterized in that each of the cooling fans is also provided with a flow detection device at the air inlet, the grate cooler housing is also provided with a first pressure detection device, and the kiln head hood is also provided with a second pressure detection device; it also includes an adjustment response module, and the adjustment response module is electrically connected to each flow detection device, the first pressure detection device and the second pressure detection device; The control method comprises the following steps: S1: Based on the operating output of the kiln system and the parameters of the system coal consumption, calculate the total air volume Q1 required for the theoretical secondary and tertiary air and the cooling fan air volume Q2 corresponding to the theoretical secondary and tertiary air supply area: Among them, q Fi : Fi cooling fan air volume; Ai: Fi is the number of grate plates in the corresponding air chamber of the cooling fan; ai: The number of grates in the theoretical air supply area of ​​the secondary and tertiary air in the air chamber corresponding to the Fi cooling fan; S2: The adjustment response module adjusts the air volume measured by the flow measurement devices on several cooling fans corresponding to the air supply area and the pressure P at points A, B, and C near the theoretical zero pressure surface measured by the first pressure detection device on the shell according to the secondary and tertiary wind theory of the system. A 、P B 、P C The second pressure detection device on the kiln head cover measures the pressure P0 inside the kiln head cover. Through the strategy control model, the high temperature fan speed r is adjusted. ID , Kiln exhaust fan speed r EP , cooling fan speed r Fi , grate bed pushing speed r of grate cooler GP Parameters, maintain the zero pressure surface in the grate cooler at a reasonable position, maintain the negative pressure of the kiln head hood in an appropriate range, and stabilize the system operating conditions; S3: Compare the theoretical total air volume Q1 of the secondary and tertiary air flow with the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the secondary and tertiary air flow. When Q1 and Q2 are equal, the boundary of the cooling fan air supply area corresponding to Q2 can be considered to be the theoretical zero-pressure surface position A in the grate cooler. Pressure measuring points B and C are set at the theoretical zero-pressure surface and 1.5 m before and after. S4: According to the system operating conditions, the high temperature fan speed r ID , Kiln exhaust fan speed r EP , the cooling fan air volume Q2 corresponding to the secondary and tertiary air supply area, the cooling fan speed r corresponding to the secondary and tertiary air supply area Fi , grate bed pushing speed r GP , zero pressure surface and the negative pressure values ​​of nearby measuring points A, B, and C (P A 、P B 、P C ), the kiln head hood negative pressure (P0) parameter is included in the zero pressure surface intelligent adjustment response system; S5: Adjust the response module to the collected P A 、P B 、P C , P0 pressure data is processed by real-time mean filtering method, namely: Among them, P i Indicates the i-th value of the pressure variable after filtering, P j represents the real-time value of the pressure variable at time j, n is the cycle time parameter of the mean filter, and N is a set of natural numbers.

2. The control method of the online monitoring and intelligent adjustment response system of the zero-pressure surface in the clinker grate cooler according to claim 1 is characterized in that: There are the following situations in step S2: (1) The negative pressure P0 of the kiln head cover increases, and the negative pressure P C Decrease, negative pressure P at point A A and negative pressure P at point B B Increased, the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the secondary and tertiary air is normal, which means that the zero pressure surface moves toward point C, which means that the high-temperature fan is pulling too much air, and the total secondary and tertiary air volume entering the kiln system is too large. Some of the low-temperature air in the rear section of the theoretical air supply area of ​​the secondary and tertiary air is introduced into the kiln by the high-temperature fan, which will cause the secondary and tertiary air temperature to drop and the energy consumption to increase. At this time, the high-temperature fan speed should be reduced; (2) The negative pressure P0 of the kiln head cover increases, and the negative pressure P C Decrease, negative pressure P at point A A and negative pressure P at point B B Increase, the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the second and third air is low, which means that the zero pressure surface moves toward point C, which means that the cooler material layer becomes thicker, and the cooling fan air volume Q2 corresponding to the second and third air decreases. At this time, the grate bed speed should be increased or the cooling fan speed corresponding to the theoretical air supply area of ​​the second and third air should be increased; (3) The negative pressure P0 of the kiln head cover decreases, and the negative pressure P B Decrease, negative pressure P at point A A and negative pressure P at point C C Increase, the cooling fan air volume Q2 corresponding to the theoretical air supply area of ​​the second and third air increases, and the zero pressure surface moves toward point B, which means that the material layer of the cooler becomes thinner, and the cooling fan air volume Q2 corresponding to the second and third air increases. At this time, the grate bed speed should be reduced or the cooling fan speed corresponding to the theoretical air supply area of ​​the second and third air should be reduced; (4) The negative pressure P0 of the kiln head cover increases, and the negative pressure P of measuring points A, B, and C increases. A 、P B and P C Increase, the cooling fan air volume Q2 corresponding to the secondary and tertiary air theoretical supply area is normal, and the zero-pressure surface is close to the kiln head, which means that the kiln head exhaust fan is pulling too much air, and the total secondary and tertiary air volume entering the kiln system is too small. At this time, the speed of the kiln head exhaust fan should be reduced.

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