Automatic control method of rotary kiln system

Abstract

The invention discloses an automatic control method for a rotary kiln system, comprising: S1, initially judging the working condition of the firing system; S2, secondarily judging the working condition of the firing system; S21, judging whether the working condition of the clinker is easy to burn is true according to the clinker KH, free calcium and secondary air temperature; S22, judging whether the working condition of the clinker is difficult to burn is true according to the clinker KH, free calcium and secondary air temperature; S23, judging whether the working condition of the grate cooler heat balance forward movement is true according to the secondary air temperature, the inlet temperature of the waste heat power generation and the total air volume data of the grate cooler. S24, judging whether the condition of the backward shift of the heat balance of the grate cooler is true according to the secondary air temperature, the inlet temperature of the waste heat power generation and the total air volume data of the grate cooler; S25, if the conditions of S21, S22, S23 and S24 are all false, the state of the firing system being in normal condition is true; S3, identifying the condition by judging the condition and calling the corresponding control strategy control system, solves the technical problem that the prior art cannot effectively and accurately judge the condition and make corresponding parameter changes.

Description

Technical Field

[0001] The invention relates to the field of rotary kilns, and in particular to an automatic control method for a rotary kiln system. Background Art

[0002] A rotary kiln refers to a rotary calcining kiln (commonly known as a rotary kiln), which belongs to the category of building materials equipment. It can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the different materials processed. Cement kilns are mainly used to calcine cement clinker, and are divided into two categories: dry-process cement kilns and wet-process cement kilns. Metallurgical chemical kilns are mainly used for magnetization roasting of lean iron ore in steel plants in the metallurgical industry; oxidation roasting of chromium and nickel iron ores; roasting of high metallurgical ores in refractory materials plants and roasting of clinker and aluminum hydroxide in aluminum plants; and roasting of chromium ore sand and chromium ore powder and other minerals in chemical plants. Lime kilns are used to roast active lime and light-burned dolomite for steel plants and ferroalloy plants. The prior art discloses a Chinese patent with application number "202211211812.1" and invention name "A method for optimizing control parameters of a cement rotary kiln". Although the patent can realize the control of rotary kiln parameters, the applicant found that there are still problems. The method disclosed in the patent cannot realize accurate judgment of working conditions and parameter setting for different working conditions. Summary of the invention

[0003] The object of the present invention is to provide an automatic control method for a rotary kiln system to solve the technical problem in the prior art that the working conditions cannot be effectively and accurately judged and corresponding parameter changes cannot be made.

[0004] To achieve the above object, the present invention provides an automatic control method for a rotary kiln system, comprising the following steps:

[0005] S1, initial judgment of the working condition of the firing system;

[0006] S11, the firing system is in normal working condition;

[0007] S12, the burning system is in the condition where the clinker is easy to burn;

[0008] S13, the burning system is in the condition of difficult burning of clinker;

[0009] S14, the firing system is in the forward moving condition of the heat balance of the grate cooler;

[0010] S15, the firing system is in the condition of heat balance and backward movement of the grate cooler;

[0011] S2, secondary judgment of the working condition of the firing system;

[0012] S21, judging whether the clinker easy burning condition is true according to the clinker KH, free calcium and secondary air temperature;

[0013] S22, judging whether the clinker difficult burning condition is true according to the clinker KH, free calcium and secondary air temperature;

[0014] S23, judging whether the grate cooler heat balance forward shifting condition is true according to the secondary air temperature, the waste heat power generation inlet temperature, and the grate cooler total air volume data;

[0015] S24, judging whether the heat balance backward shift condition of the grate cooler is true according to the secondary air temperature, the waste heat power generation inlet temperature, and the total air volume data of the grate cooler;

[0016] S25, if the working conditions of S21, S22, S23, and S24 are all false, the state of the firing system being in normal working condition is true;

[0017] S3, the intelligent control system identifies the kiln working conditions by judging the conditions and calls the corresponding control strategy control system;

[0018] S31, normal operating condition is true, and the normal operating condition strategy is used;

[0019] S32, the clinker easy-to-burn condition is true, and the easy-to-burn kiln condition control strategy is used;

[0020] S33, the clinker difficult burning condition is true, and the difficult burning kiln condition control strategy is used;

[0021] S34, the grate cooler heat balance forward shifting condition is true, and the grate cooler heat balance forward shifting control strategy is used;

[0022] S35, the grate cooler heat balance backward shift condition is true, and the grate cooler heat balance backward shift control strategy is used.

[0023] Further, the S31 includes the following steps:

[0024] S3101, set the parameters for adding tail coal: the upper limit is 21t / h, the lower limit is 18t / h; set the parameters of the tail coal addition controller: the gain is 50, the lag time is 600s, and the steady-state time is 90s;

[0025] S3102, set the parameters of the decomposition furnace outlet temperature feedforward (FF) controller: gain is 1, lag time is 340s, and steady-state time is 1s;

[0026] S3103, control the decomposition furnace outlet temperature (CV): the upper limit is 880℃, the lower limit is 860℃;

[0027] S3104, observe the filtering time of the filter and obtain the filtering value (CV) of the decomposition furnace outlet temperature.

[0028] Further, the S31 includes the following steps:

[0029] S3105, determine the negative pressure parameters of the kiln head; set the parameters of the head exhaust fan: the upper limit is 690rpm, the lower limit is 380rpm; set the parameters of the head exhaust fan controller: the gain is -0.15, the lag time is 90s, and the steady-state time is 2s;

[0030] S3106, judging the state of the first exhaust fan when the coal mill is stopped. If the coal mill hot air valve is less than 40% and the coal mill main motor current is less than 10A, it is judged that the coal mill is stopped, and the speed of the first exhaust fan is increased by 30rpm at one time;

[0031] S3107, judge the state of the first exhaust fan when the coal mill is turned on. If the coal mill hot air valve is >40% and the coal mill main motor current is >40A, it is determined that the coal mill is turned on and the speed of the first exhaust fan is reduced by 30rpm at one time.

[0032] Further, the S31 includes the following steps:

[0033] S3108, set the parameters of a section of grate speed: the upper limit is 6.0rpm, the lower limit is 5.0rpm; set the parameters of a section of grate speed controller: the gain is -6, the lag time is 2s, the steady-state time is 600s;

[0034] S3109, set the parameters of the grate cooler first stage pressure feedforward (FF) controller: the gain is 4, the lag time is 1s, it is impossible to effectively and accurately judge the working conditions and make corresponding parameter changes, and the steady-state time is 10s;

[0035] S3110, control the second air chamber pressure (CV): the upper limit is 7600Pa, the lower limit is 7200Pa;

[0036] S3111, observe the filtering time of the filter and obtain the first stage pressure filtering value (CV) of the grate cooler.

[0037] Furthermore, the S31 includes a system total air volume adjustment control strategy, including the following steps:

[0038] S3112, determine the system carbon monoxide parameters and adjust the system air volume;

[0039] S3113: If the four-hour average value of carbon monoxide in the system is greater than 160ppm and the oxygen content in the system is less than 1.5%, the oxygen content in the system is judged to be low, and the high-temperature fan speed is adjusted to increase the high-temperature fan speed by 5rpm;

[0040] S3114: If the four-hour average value of carbon monoxide in the system is less than 160ppm and the oxygen content in the system is greater than 1.5%, it is determined that the oxygen content in the system is too high, and the high-temperature fan speed is adjusted to reduce the high-temperature fan speed by 5rpm.

[0041] Further, the S32 comprises the following steps:

[0042] S3201, judge that the clinker KH is less than 0.905, the free calcium is less than 0.6, and the two-hour average secondary air temperature is greater than 1200℃. If two of the first three are met, the clinker is judged to be easy to burn, and the decomposition furnace outlet temperature is set to be 5℃ lower than the original set target value, and the head coal is set to be reduced by 0.1t / h.

[0043] Further, the S33 comprises the following steps:

[0044] S3301, judge that the clinker KH>0.920, judge that the free calcium>1.40, judge that the two-hour average value of the secondary air temperature is less than 1150℃, and when two of the first three are met, it is judged that the clinker has poor burnability, and the decomposition furnace outlet temperature is set to increase by 5℃ on the basis of the original set target value, and the head coal is set to be increased by 0.1t / h.

[0045] Further, the S34 comprises the following steps:

[0046] S3401, if the hourly average temperature of the secondary air temperature rises and the average temperature of the boiler inlet temperature drops, it is determined that the heat of the grate cooler moves forward, and the pressure of the second air chamber of the grate cooler is reduced by 100pa, the grate speed is increased, and the heat of the grate cooler is adjusted backward.

[0047] Further, the S35 comprises the following steps:

[0048] S3501, if the hourly average temperature of the secondary air temperature decreases and the average temperature of the boiler inlet temperature increases, it is determined that the heat of the grate cooler moves backward, and the pressure of the second air chamber of the grate cooler is increased by 100pa, the grate speed is reduced, and the heat of the grate cooler is adjusted forward.

[0049] Based on the above technical scheme, the present invention has the following advantages: the automatic control method of a rotary kiln system provided in the present application replaces the operator to realize the automatic operation of the system when the kiln is operating normally, and a virtual operator is created through a computer program to simulate manual operation, thereby realizing 24-hour precise adjustment, improving system stability, and improving quality and output. During normal operation, the operator is completely replaced, and fully automatic intelligent operation is performed to realize the judgment of different working conditions and the adjustment and control of production parameters according to different working conditions, thereby reducing the manpower cost of the enterprise and solving the technical problem that the existing technology cannot effectively and accurately judge the working conditions and make corresponding parameter changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to better understand the purpose, structure and function of the present invention, the automatic control method of a rotary kiln system of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0052] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] To achieve the above object, the present invention provides an automatic control method for a rotary kiln system, comprising the following steps:

[0054] S1, initial judgment of the working condition of the firing system;

[0055] S11, the firing system is in normal working condition;

[0056] S12, the burning system is in the condition where the clinker is easy to burn;

[0057] S13, the burning system is in the condition of difficult burning of clinker;

[0058] S14, the firing system is in the forward moving condition of the heat balance of the grate cooler;

[0059] S15, the firing system is in the condition of heat balance and backward movement of the grate cooler;

[0060] S2, secondary judgment of the working condition of the firing system;

[0061] S21, judging whether the clinker easy burning condition is true according to the clinker KH, free calcium and secondary air temperature;

[0062] S22, judging whether the clinker difficult burning condition is true according to the clinker KH, free calcium and secondary air temperature;

[0063] S23, judging whether the grate cooler heat balance forward shifting condition is true according to the secondary air temperature, the waste heat power generation inlet temperature, and the grate cooler total air volume data;

[0064] S24, judging whether the heat balance backward shift condition of the grate cooler is true according to the secondary air temperature, the waste heat power generation inlet temperature, and the total air volume data of the grate cooler;

[0065] S25, if the working conditions of S21, S22, S23, and S24 are all false, the state of the firing system being in normal working condition is true;

[0066] S3, the intelligent control system identifies the kiln working conditions by judging the conditions and calls the corresponding control strategy control system;

[0067] S31, normal operating condition is true, and the normal operating condition strategy is used;

[0068] S32, the clinker easy-to-burn condition is true, and the easy-to-burn kiln condition control strategy is used;

[0069] S33, the clinker difficult burning condition is true, and the difficult burning kiln condition control strategy is used;

[0070] S34, the grate cooler heat balance forward shifting condition is true, and the grate cooler heat balance forward shifting control strategy is used;

[0071] S35, the grate cooler heat balance backward shift condition is true, and the grate cooler heat balance backward shift control strategy is used.

[0072] Further, the S31 includes the following steps:

[0073] S3101, set the parameters for adding tail coal: the upper limit is 21t / h, the lower limit is 18t / h; set the parameters of the tail coal addition controller: the gain is 50, the lag time is 600s, and the steady-state time is 90s;

[0074] S3102, set the parameters of the decomposition furnace outlet temperature feedforward (FF) controller: gain is 1, lag time is 340s, and steady-state time is 1s;

[0075] S3103, control the decomposition furnace outlet temperature (CV): the upper limit is 880℃, the lower limit is 860℃;

[0076] S3104, observe the filtering time of the filter and obtain the filtering value (CV) of the decomposition furnace outlet temperature.

[0077] S3105, determine the negative pressure parameters of the kiln head; set the parameters of the head exhaust fan: the upper limit is 690rpm, the lower limit is 380rpm; set the parameters of the head exhaust fan controller: the gain is -0.15, the lag time is 90s, and the steady-state time is 2s;

[0078] S3106, judging the state of the first exhaust fan when the coal mill is stopped. If the coal mill hot air valve is less than 40% and the coal mill main motor current is less than 10A, it is judged that the coal mill is stopped, and the speed of the first exhaust fan is increased by 30rpm at one time;

[0079] S3107, judge the state of the first exhaust fan when the coal mill is turned on. If the coal mill hot air valve is >40% and the coal mill main motor current is >40A, it is determined that the coal mill is turned on and the speed of the first exhaust fan is reduced by 30rpm at one time.

[0080] S3108, set the parameters of a section of grate speed: the upper limit is 6.0rpm, the lower limit is 5.0rpm; set the parameters of a section of grate speed controller: the gain is -6, the lag time is 2s, the steady-state time is 600s;

[0081] S3109, set the parameters of the grate cooler first stage pressure feedforward (FF) controller: the gain is 4, the lag time is 1s, it is impossible to effectively and accurately judge the working conditions and make corresponding parameter changes, and the steady-state time is 10s;

[0082] S3110, control the second air chamber pressure (CV): the upper limit is 7600Pa, the lower limit is 7200Pa;

[0083] S3111, observe the filtering time of the filter and obtain the first stage pressure filtering value (CV) of the grate cooler.

[0084] S3112, determine the system carbon monoxide parameters and adjust the system air volume;

[0085] S3113: If the four-hour average value of carbon monoxide in the system is greater than 160ppm and the oxygen content in the system is less than 1.5%, the oxygen content in the system is judged to be low, and the high-temperature fan speed is adjusted to increase the high-temperature fan speed by 5rpm;

[0086] S3114: If the four-hour average value of carbon monoxide in the system is less than 160ppm and the oxygen content in the system is greater than 1.5%, it is determined that the oxygen content in the system is too high, and the high-temperature fan speed is adjusted to reduce the high-temperature fan speed by 5rpm.

[0087] Furthermore, the S32 includes the following steps: S3201, judging that the clinker KH is less than 0.905, judging that the free calcium is less than 0.6, judging that the two-hour average value of the secondary air temperature is greater than 1200°C, and when two of the first three are met, it is judged that the clinker is easy to burn, and the decomposition furnace outlet temperature is set to be reduced by 5°C based on the original set target value, and the head coal is set to be reduced by 0.1t / h.

[0088] Furthermore, the S33 includes the following steps: S3301, judging that the clinker KH>0.920, judging that the free calcium>1.40, judging that the two-hour average value of the secondary air temperature is less than 1150°C, when two of the first three are met, it is judged that the clinker has poor flammability, and the decomposition furnace outlet temperature is set to be increased by 5°C on the basis of the original set target value, and the head coal is set to be added at 0.1t / h.

[0089] Furthermore, the S34 includes the following steps: S3401, if the hourly average temperature of the secondary air temperature rises and the average temperature of the boiler inlet temperature drops, it is determined that the heat of the grate cooler moves forward, then the pressure of the second air chamber of the grate cooler is reduced by 100pa, the grate speed is increased, and the heat of the grate cooler is adjusted backward.

[0090] Furthermore, the S35 includes the following steps: S3501, if the hourly average temperature of the secondary air temperature decreases and the average temperature of the boiler inlet temperature increases, it is determined that the heat of the grate cooler moves backward, and the pressure of the second air chamber of the grate cooler is increased by 100pa, the grate speed is reduced, and the heat of the grate cooler is adjusted forward.

[0091] It should be noted that the existing cement kiln control system still relies on experienced operators to adjust the system to ensure the stable operation of the system. Once the operator does not operate for a long time, it will cause large system fluctuations, unqualified quality, and reduced production, which will seriously affect the stable operation of the system. Limited by the physiological functions of the human body, it is impossible for humans to concentrate on operating the system for 8 hours, resulting in extensive system operation methods, and the quality and output cannot reach the optimal value. Therefore, since the kiln system frequently requires manual intervention, each production line needs to be equipped with 4 operators, and the labor cost is huge.

[0092] The present application provides an automatic control method for a rotary kiln system, which replaces the operator to realize the automatic operation of the system when the kiln is operating normally. A virtual operator is created by a computer program to simulate manual operation, realize 24-hour precise adjustment, improve system stability, and improve quality and output. During normal operation, the operator is completely replaced, and fully automatic intelligent operation is performed to realize the judgment of different working conditions and adjust and control the production parameters according to different working conditions, thereby reducing the labor cost of the enterprise and solving the technical problem that the existing technology cannot effectively and accurately judge the working conditions and make corresponding parameter changes.

[0093] The applicant of the present application has formulated five optimal operating strategies through research and analysis on five operating conditions in the production process, namely, normal operating conditions, conditions where clinker is easy to burn, conditions where clinker is difficult to burn, conditions where the heat balance of the grate cooler moves forward, and conditions where the heat balance of the grate cooler moves backward. The strategies have also been developed into software programs, which identify the operating conditions through their characteristic conditions and call the corresponding strategy system.

[0094] It is worth noting that in S31, the system CO is higher than 160 mg / m 3 When the CO content of the kiln tail chimney is >160mg / m 3 , and when the decomposition furnace temperature is greater than the set lower limit of 860℃, the given amount of tail coal is only allowed to decrease, not increase.

[0095] It is worth noting that in S31, the control logic of the system secondary air temperature and boiler inlet temperature is: when the secondary air temperature is lower than the set lower limit, the system determines that the heat recovery efficiency of the grate cooler is low, and the grate speed of the first stage of the grate cooler is reduced. When the boiler inlet temperature is lower than the set lower limit, the system determines that the material layer is too thick and the heat moves forward, and the grate speed of the first stage of the grate cooler is increased.

[0096] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An automatic control method for a rotary kiln system, characterized in that: The following steps are involved: S1, initial judgment of the working condition of the firing system; S11, the firing system is in normal working condition; S12, the burning system is in the condition where the clinker is easy to burn; S13, the burning system is in the condition of difficult burning of clinker; S14, the firing system is in the forward moving condition of the heat balance of the grate cooler; S15, the firing system is in the condition of heat balance and backward movement of the grate cooler; S2, secondary judgment of the working condition of the firing system; S21, judging whether the clinker easy burning condition is true according to the clinker KH, free calcium and secondary air temperature; S22, judging whether the clinker difficult burning condition is true according to the clinker KH, free calcium and secondary air temperature; S23, judging whether the grate cooler heat balance forward shifting condition is true according to the secondary air temperature, the waste heat power generation inlet temperature, and the grate cooler total air volume data; S24, judging whether the heat balance backward shift condition of the grate cooler is true according to the secondary air temperature, the waste heat power generation inlet temperature, and the total air volume data of the grate cooler; S25, if the working conditions of S21, S22, S23, and S24 are all false, the state of the firing system being in normal working condition is true; S3, the intelligent control system identifies the kiln working conditions by judging the conditions and calls the corresponding control strategy control system; S31, normal operating condition is true, and the normal operating condition strategy is used; S32, the clinker easy-to-burn condition is true, and the easy-to-burn kiln condition control strategy is used; S33, the clinker difficult burning condition is true, and the difficult burning kiln condition control strategy is used; S34, the grate cooler heat balance forward shifting condition is true, and the grate cooler heat balance forward shifting control strategy is used; S35, the grate cooler heat balance backward shift condition is true, and the grate cooler heat balance backward shift control strategy is used.

2. The automatic control method of a rotary kiln system according to claim 1, characterized in that: The S31 comprises the following steps: S3101, set the parameters for adding tail coal: the upper limit is 21t / h, the lower limit is 18t / h; set the parameters of the tail coal addition controller: the gain is 50, the lag time is 600s, and the steady-state time is 90s; S3102, setting the parameters of the decomposition furnace outlet temperature feedforward controller: gain is 1, lag time is 340s, and steady-state time is 1s; S3103, control the outlet temperature of the decomposition furnace: the upper limit is 880℃, the lower limit is 860℃; S3104, observe the filtering time of the filter and obtain the filtering value of the decomposition furnace outlet temperature.

3. The automatic control method of a rotary kiln system according to claim 2, characterized in that: The S31 The following steps are involved: S3105, determine the negative pressure parameters of the kiln head; set the parameters of the head exhaust fan: the upper limit is 690rpm, the lower limit is 380rpm; set the parameters of the head exhaust fan controller: the gain is -0.15, the lag time is 90s, and the steady-state time is 2s; S3106, judging the state of the first exhaust fan when the coal mill is stopped. If the coal mill hot air valve is less than 40% and the coal mill main motor current is less than 10A, it is judged that the coal mill is stopped, and the speed of the first exhaust fan is increased by 30rpm at one time; S3107, judge the state of the first exhaust fan when the coal mill is turned on. If the coal mill hot air valve is >40% and the coal mill main motor current is >40A, it is determined that the coal mill is turned on and the speed of the first exhaust fan is reduced by 30rpm at one time.

4. The automatic control method of a rotary kiln system according to claim 3, characterized in that: The S31 comprises the following steps: S3108, set the parameters of a section of grate speed: the upper limit is 6.0rpm, the lower limit is 5.0rpm; set the parameters of a section of grate speed controller: the gain is -6, the lag time is 2s, the steady-state time is 600s; S3109, set the parameters of the first stage pressure feedforward controller of the grate cooler: the gain is 4, the lag time is 1s, and the working condition cannot be effectively and accurately judged and the corresponding parameter changes cannot be made. The steady-state time is 10s; S3110, control the pressure of the second air chamber: the upper limit is 7600Pa, the lower limit is 7200Pa; S3111, observe the filtering time of the filter and obtain the first stage pressure filtering value of the grate cooler.

5. The automatic control method of a rotary kiln system according to claim 4, characterized in that: The S31 includes a system total air volume adjustment control strategy, including the following steps: S3112, determine the system carbon monoxide parameters and adjust the system air volume; S3113, if the four-hour average value of carbon monoxide in the system is greater than 160ppm and the oxygen content in the system is less than 1.5%, it is determined that the oxygen content in the system is low, and the high-temperature fan speed is adjusted to increase the high-temperature fan speed by 5rpm; S3114: If the four-hour average carbon monoxide value of the system is less than 160ppm and the oxygen content of the system is greater than 1.5%, it is determined that the oxygen content of the system is too high, and the high-temperature fan speed is adjusted to reduce the high-temperature fan speed by 5rpm.

6. The automatic control method of a rotary kiln system according to claim 1, characterized in that: The S32 The following steps are involved: S3201, judge that the clinker KH is less than 0.905, the free calcium is less than 0.6, and the two-hour average secondary air temperature is greater than 1200℃. If two of the first three are met, the clinker is judged to be easy to burn, and the decomposition furnace outlet temperature is set to be 5℃ lower than the original set target value, and the head coal is set to be reduced by 0.1t / h.

7. The automatic control method of a rotary kiln system according to claim 1, characterized in that: The S33 comprises the following steps: S3301, judge that the clinker KH>0.920, judge that the free calcium>1.40, judge that the two-hour average value of the secondary air temperature is less than 1150℃, and when two of the first three are met, it is judged that the clinker has poor burnability, and the decomposition furnace outlet temperature is set to increase by 5℃ on the basis of the original set target value, and the head coal is set to be increased by 0.1t / h.

8. The automatic control method of a rotary kiln system according to claim 1, characterized in that: The S34 comprises the following steps: S3401, if the hourly average temperature of the secondary air temperature rises and the average temperature of the boiler inlet temperature drops, it is determined that the heat of the grate cooler moves forward, and the pressure of the second air chamber of the grate cooler is reduced by 100pa, the grate speed is increased, and the heat of the grate cooler is adjusted backward.

9. The automatic control method of a rotary kiln system according to claim 1, characterized in that: The S35 comprises the following steps: S3501, if the hourly average temperature of the secondary air temperature decreases and the average temperature of the boiler inlet temperature increases, it is determined that the heat of the grate cooler moves backward, and the pressure of the second air chamber of the grate cooler is increased by 100pa, the grate speed is reduced, and the heat of the grate cooler is adjusted forward.

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