CN114674146B - Intelligent control system and control method for cement rotary kiln burner - Google Patents
Intelligent control system and control method for cement rotary kiln burner Download PDFInfo
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- CN114674146B CN114674146B CN202210271618.6A CN202210271618A CN114674146B CN 114674146 B CN114674146 B CN 114674146B CN 202210271618 A CN202210271618 A CN 202210271618A CN 114674146 B CN114674146 B CN 114674146B
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- 239000004568 cement Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 16
- 238000010304 firing Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 238000012937 correction Methods 0.000 claims description 19
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- 239000003546 flue gas Substances 0.000 claims 1
- 238000001354 calcination Methods 0.000 abstract description 14
- 238000005457 optimization Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
- F27B7/42—Arrangement of controlling, monitoring, alarm or like devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention relates to an intelligent control system of a cement rotary kiln burner and a control method thereof, wherein the control system comprises a cement firing DCS control system, a pressure transmitter, a valve, an electric actuator and a PLC control system, the control method adopts a specific control algorithm through the PLC control system, the parameters of secondary air temperature, kiln tail smoke chamber temperature and kiln cylinder scanning temperature collected by the cement firing DCS control system are predicted and analyzed, the pressure required by each primary air duct of the optimized burner is calculated, the calculated pressure required by each primary air duct of the burner is compared with pressure data returned by the pressure transmitter, if deviation exists, a control signal is sent to the electric actuator, and the valve on the corresponding air duct is regulated to regulate the pressure to the required pressure. The invention ensures that the working condition configuration parameters of the burner are adapted to the calcination condition of the rotary kiln, thereby prolonging the service life of the rotary kiln equipment and improving the calcination quality of the cement clinker.
Description
Technical Field
The invention belongs to the technical field of cement burning systems, and particularly relates to an intelligent control system and a control method for a cement rotary kiln burner.
Background
The rotary kiln burner in the cement sintering system is one of important equipment, and the use of the burner determines important parameters such as the running state of the rotary kiln equipment in the sintering process, the quality of the finally sintered clinker and the like.
The conventional burner adopts one to two fans to provide primary air, and generally consists of an axial air channel and a rotational flow air channel with tangential angles, wherein a butterfly control valve is arranged on a connecting pipeline of each air channel and the fan, so that the air quantity passing through each air channel can be adjusted. In actual cement production, the shape and the temperature distribution of flame in the rotary kiln can be adjusted by adjusting the air quantity of axial air and rotational air, so that the flame is more suitable for the calcination condition of materials, and the calcination of the materials in the rotary kiln is optimized.
On one hand, the adjustment of the burner is related to the state and the proportion of materials in a cement burning system, in particular to a rotary kiln, and the analysis and judgment of the burner are carried out by needing to evaluate a plurality of parameters such as the secondary air temperature of a comprehensive cooler, the temperature of a kiln tail smoke chamber, the scanning temperature of a kiln cylinder body and the like, so that an operator can hardly judge the calcination condition in the kiln timely and accurately, and the configuration parameters of the burner can be adjusted timely; on the other hand, the rotary kiln burner is only one device in the cement burning system, and cement burning operators need to track and observe other multiple cement burning parameters and cannot concentrate on the adjustment of the burner, so that the rotary kiln burner for cement burning often works by adopting fixed working condition configuration, and the air quantity is seldom adjusted.
At present, no intelligent control system or scheme of the rotary kiln burner is available at home and abroad, and the intelligent control system is adopted to intelligently judge the calcination condition, flame shape and temperature distribution in the rotary kiln and automatically adjust the burner, so that the burden of cement sintering operators can be greatly reduced, and the sintering quality of cement clinker is improved.
Disclosure of Invention
The invention provides an intelligent control system and a control method for a cement rotary kiln burner, which are used for solving the problems of burner use and working condition configuration optimization of the cement rotary kiln and are used for analyzing, judging and automatically adjusting the burner configuration based on the firing state of the cement rotary kiln. The parameters related to the calcination of the rotary kiln in the cement calcination system are collected, analyzed and judged, and the valve opening of each air duct on the rotary kiln burner is automatically adjusted according to the related parameters, so that the working condition configuration parameters of the burner are adapted to the calcination condition of the rotary kiln, the service life of rotary kiln equipment is prolonged, the calcination quality of cement clinker is improved, and the aim of optimizing cement calcination is fulfilled.
The invention is realized in such a way that an intelligent control system for the cement rotary kiln burner comprises:
The cement sintering DCS control system is used for collecting related parameters of the rotary kiln of the cement sintering system and transmitting the related parameters to the PLC control system, wherein the related parameters comprise secondary air temperature, kiln tail smoke chamber temperature and kiln cylinder scanning temperature;
The pressure transmitters are arranged on pressure measuring points of all primary air channels of the burner, and are used for measuring the corresponding pressure of all primary air channels of the burner and converting pressure data into digital signals to be transmitted to the PLC control system;
The electric actuator is used for controlling the valves on the primary air channels of the burner so as to adjust the ventilation quantity, thereby controlling the flame shape and the temperature distribution in the rotary kiln;
The input end of the PLC control system is respectively connected with the cement burning DCS control system and the pressure transmitter, and the output end of the PLC control system is connected with the electric actuator; the PLC control system is used for analyzing and calculating the pressure required by each primary air duct of the combustor according to the acquired related parameters of the rotary kiln, comparing the calculated pressure required by each primary air duct of the combustor with pressure data returned by the pressure transmitter, and controlling the electric actuator to adjust the valve of the corresponding air duct of the combustor to adjust the pressure of the corresponding air duct to the required pressure if the pressure of the corresponding air duct has deviation.
According to the control method of the intelligent control system of the cement rotary kiln burner, the PLC control system is used for carrying out predictive analysis on secondary air temperature, kiln tail smoke chamber temperature and kiln cylinder scanning temperature parameters acquired by the cement firing DCS control system, pressure required by each primary air duct of the optimized burner is calculated, the calculated pressure required by each primary air duct of the burner is compared with pressure data returned by the pressure transmitter, if deviation exists in the pressure of the corresponding air duct, a control signal is sent to the electric actuator, and a valve on the corresponding air duct is regulated to regulate the pressure of the corresponding air duct to the required pressure.
Preferably, when the burner is divided into four-duct single-fan burners, the control algorithm of the pressure required by each primary air duct is as follows:
ΔP1＝α×ΔT1+β×ΔT3+γ×ΔL1+μ×ΔT5
ΔP2＝α×ΔT1+β×ΔT2+γ×ΔT3+μ×ΔT4+ν×ΔL1+ω×ΔL2
ΔP3＝α×ΔT2+β×ΔT4+γ×ΔL2+μ×ΔT5
Wherein: Δp 1 is the pressure (Pa) of the axial flow duct, Δp 2 is the pressure (Pa) of the external swirl duct, Δp 3 is the pressure (Pa) of the internal swirl duct, Δt 1 is the secondary air temperature (c), Δt 2 is the kiln tail smoke chamber temperature (c), Δt 3 is the highest temperature (c) of the rotary kiln cylinder at 0-5 m position, Δt 4 is the highest temperature (c) of the rotary kiln cylinder at 5-15 m position, Δl 1 is the distance (m) of the rotary kiln cylinder at 0-5 m position from the kiln mouth, Δl 2 is the distance (m) of the rotary kiln cylinder at 5-15 m position from the kiln mouth, and Δt 5 is the flame temperature (c) measured by the colorimetric pyrometer, α, β, γ, μ, ν, w are correction factors.
Preferably, when the burner is divided into four-channel double-fan burners, the control algorithm of the pressure required by each primary air duct is as follows:
ΔP1＝α×ΔT1+β×ΔT3+γ×ΔL1+μ×ΔT5
ΔP2＝α×ΔT1+β×ΔT2+γ×ΔT3+ν×ΔL1+μ×ΔT5
ΔP3＝α×ΔT2+β×ΔT4+γ×ΔL2+μ×ΔT5
Wherein: Δp 1 is the pressure (Pa) of the cooling air duct, Δp 2 is the pressure (Pa) of the axial flow air duct, Δp 3 is the pressure (Pa) of the rotational flow air duct, Δt 1 is the secondary air temperature (c), Δt 2 is the kiln tail smoke chamber temperature (c), Δt 3 is the highest temperature (c) of the rotary kiln cylinder at 0-5 m position, Δt 4 is the highest temperature (c) of the rotary kiln cylinder at 5-15 m position, Δl 1 is the distance (m) of the rotary kiln cylinder at 0-5 m position from the kiln mouth, Δl 2 is the distance (m) of the rotary kiln cylinder at 5-15 m position from the kiln mouth, and Δt 5 is the flame temperature (c) measured by the colorimetric pyrometer, and α, β, γ, μ, v are correction factors.
Further preferably, the parameters Δt 1、ΔT2、ΔT3、ΔT4、ΔT5、ΔL1 and Δl 2 in the cement-burning DCS control system are calculated as average values of the parameters every half hour.
Further preferably, the primary air duct pressure Δp 1、ΔP2、ΔP3 of the burner is provided with a maximum value and a minimum value, and an adjustment extremum for real-time optimization adjustment of the variation, wherein the adjustment extremum does not exceed 30% of the maximum pressure.
Further preferably, the correction factors α, β, γ, μ, ν, w are set in advance and corrected in post-hoc mode, the initial value set in advance is obtained by averaging a plurality of actual use cases in the field, and the correction can be set independently according to specific situations after the application in the specific field.
The invention has the advantages and positive effects that:
The control system of the invention carries out logic judgment from the change rules of a plurality of parameters of the secondary air temperature of the rotary kiln, the temperature of a smoke chamber at the tail of the rotary kiln and the scanning temperature of the kiln cylinder body, analyzes the running state of the burner of the rotary kiln for a period of time, obtains optimized working condition parameters of the burner according to a corresponding algorithm, adjusts the opening of the valve of each primary air duct through the electric actuator, thereby realizing the intelligent control of the working condition of the burner, further leading the working condition configuration parameters of the burner to be suitable for the calcination condition of the rotary kiln, prolonging the service life of rotary kiln equipment and improving the calcination quality of cement clinker at the same time, and achieving the purposes of intelligently adjusting and optimizing the cement calcination production by the burner.
Drawings
FIG. 1 is a flow chart of an intelligent control system for a rotary cement kiln burner provided by an embodiment of the invention;
FIG. 2 is a burner layout provided by an embodiment of the present invention.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1 and 2, the present embodiment provides an intelligent control system for a rotary cement kiln burner, including:
The cement sintering DCS control system is used for collecting related parameters of the rotary kiln of the cement sintering system and transmitting the related parameters to the PLC control system, wherein the related parameters comprise data such as secondary air temperature, kiln tail smoke chamber temperature, kiln cylinder scanning temperature, flame temperature, free calcium, vertical lifting weight, 1d strength and the like; the embodiment preferably obtains the secondary air temperature, the kiln tail smoke chamber temperature and the kiln cylinder scanning temperature data for logic calculation;
The pressure transmitters are arranged on pressure measuring points of all primary air channels of the burner, and are used for measuring the corresponding pressure of all primary air channels of the burner and converting pressure data into digital signals to be transmitted to the PLC control system;
The electric actuator is used for controlling the valves on the primary air channels of the burner so as to adjust the ventilation quantity, thereby controlling the flame shape and the temperature distribution in the rotary kiln;
The input end of the PLC control system is respectively connected with the cement burning DCS control system and the pressure transmitter, and the output end of the PLC control system is connected with the electric actuator; the PLC control system is used for analyzing and calculating the pressure required by each primary air duct of the combustor according to the acquired related parameters of the rotary kiln, comparing the calculated pressure required by each primary air duct of the combustor with pressure data returned by the pressure transmitter, and controlling the electric actuator to adjust the valve of the corresponding air duct of the combustor to adjust the pressure of the corresponding air duct to the required pressure if the pressure of the corresponding air duct has deviation.
The control method of the intelligent control system of the cement rotary kiln burner comprises the steps of adopting a specific control algorithm by the PLC control system, carrying out predictive analysis on secondary air temperature, kiln tail smoke chamber temperature and kiln cylinder scanning temperature parameters collected by the cement firing DCS control system, calculating to obtain the pressure required by each primary air duct of the optimized burner, comparing the calculated pressure required by each primary air duct of the burner with pressure data returned by a pressure transmitter, and if the pressure of the corresponding air duct has deviation, sending a control signal to an electric actuator, and adjusting a valve on the corresponding air duct to adjust the pressure of the corresponding air duct to the required pressure.
Example 1
In this embodiment, a four-duct single-fan burner is taken as an example, the burner head has four ducts, namely an axial flow duct, an external swirl duct, a coal delivery duct and an internal swirl duct, wherein the coal delivery duct is generally controlled by an independent coal delivery fan, and does not belong to the scope of the intelligent control system, and the pressure of three primary air ducts can obtain the unit time variation thereof through the following algorithm:
the control algorithm of the pressure required by each primary air duct of the burner adopts the following steps:
ΔP1＝α·ΔT1+β·ΔT3+γ·ΔL1+μ·ΔT5
ΔP2＝α·ΔT1+β·ΔT2+γ·ΔT3+μ·ΔT4+ν·ΔL1+ω·ΔL2
ΔP3＝α·ΔT2+β·ΔT4+γ·ΔL2+μ·ΔT5
Wherein: Δp 1 is the pressure (Pa) of the axial flow duct, Δp 2 is the pressure (Pa) of the external swirl duct, Δp 3 is the pressure (Pa) of the internal swirl duct, Δt 1 is the secondary air temperature (c), Δt 2 is the kiln tail smoke chamber temperature (c), Δt 3 is the highest temperature (c) of the rotary kiln cylinder at 0-5 m position, Δt 4 is the highest temperature (c) of the rotary kiln cylinder at 5-15 m position, Δl 1 is the distance (m) of the rotary kiln cylinder at 0-5 m position from the kiln mouth, Δl 2 is the distance (m) of the rotary kiln cylinder at 5-15 m position from the kiln mouth, and Δt 5 is the flame temperature (c) measured by the colorimetric pyrometer, α, β, γ, μ, ν, w are correction factors.
The correction factors α, β, γ, μ, ν, w are set in advance, and corrected in advance, and initial values set in advance are obtained by averaging a plurality of actual use cases in the field, and specifically, as shown in table 1 below, the correction can be set individually according to specific situations after the application in the field.
Table 1 correction factors for primary air duct of burner
| Control parameters | α | β | γ | μ | ν | ω |
| ΔP 1 (axial flow wind) | 50～100 | 30～80 | 1000～2000 | 50～100 | ||
| ΔP 2 (external swirl wind) | 50～100 | 50～100 | 30～80 | 30～80 | 1000～2000 | 1000～2000 |
| ΔP 3 (internal rotational flow) | 50～100 | 30～80 | 1000～2000 | 50～100 |
And according to the change condition of the delta T 1～ΔT5,ΔL1～ΔL2 parameter in the real-time monitoring cement sintering DCS control system, taking the average value of each half hour for recording, and then comparing the change condition of the average value of the parameters of the second half hour and the first half hour, and comprehensively judging the change of the flame shape and the temperature distribution in the rotary kiln. And carrying out influence proportion correction by correction factors such as alpha, beta, gamma and the like according to the change amplitude of the parameters, and calculating the pressure value of the air duct of the optimized burner, so as to obtain an optimization scheme aiming at the current flame shape and temperature distribution, and controlling an electric actuator to adjust valves on each primary air duct of the burner by a PLC control system, thereby controlling the ventilation quantity of the air duct to reach the required pressure value.
Because the change speed of the flame shape in the rotary kiln is slower, the influence of short-time fluctuation on optimization is avoided, parameter average value calculation and change condition recording are carried out by taking each half hour as a period, then the primary air duct pressure of the burner is calculated, and the optimization parameters are adjusted; and meanwhile, the fluctuation of working conditions in the rotary kiln caused by frequent adjustment of burner parameters is avoided.
In order to prevent the primary air duct pressure of the burner from greatly fluctuating and exceeding the working condition adjusting range, the primary air duct pressure deltaP 1～ΔP3 of the burner is provided with a maximum value and a minimum value, and an adjustment extremum for real-time optimization adjustment variation, namely the air duct pressure variation cannot exceed 30% of the maximum pressure, as shown in the table 2.
Table 2 burner primary air duct pressure setting data
| Control parameters | Maximum value | Minimum value | Adjusting extremum |
| ΔP 1 (axial flow wind) | 50000 | 30000 | 10000 |
| ΔP 2 (external swirl wind) | 45000 | 20000 | 5000 |
| ΔP 3 (internal rotational flow) | 45000 | 20000 | 5000 |
Similarly, the embodiment is also suitable for other three-duct or four-duct rotary kiln burners, and the axial duct and the rotational flow duct pressure to which the primary air belongs are respectively associated with control target parameters, so that a control algorithm suitable for each structural burner can be obtained.
Example 2
In this embodiment, a typical four-channel dual-fan burner is taken as an example, and the air duct arrangement form is as follows: the intelligent control system for the burner comprises a cooling air channel, an axial flow air channel, a coal delivery air channel and a rotational flow air channel, wherein the cooling air channel, the axial flow air channel and the rotational flow air channel are characteristic parameters of the intelligent control system for the burner, and are obtained after calculation according to the variable quantity of the system parameters, and the specific calculation formula is as follows:
ΔP1＝α·ΔT1+β·ΔT3+γ·ΔL1+μ·ΔT5
ΔP2＝α·ΔT1+β·ΔT2+γ·ΔT3+ν·ΔL1+μ·ΔT5
ΔP3＝α·ΔT2+β·ΔT4+γ·ΔL2+μ·ΔT5
Wherein: Δp 1 is the pressure (Pa) of the cooling air duct, Δp 2 is the pressure (Pa) of the axial flow air duct, Δp 3 is the pressure (Pa) of the rotational flow air duct, Δt 1 is the secondary air temperature (c), Δt 2 is the kiln tail smoke chamber temperature (c), Δt 3 is the highest temperature (c) of the rotary kiln cylinder at 0-5 m position, Δt 4 is the highest temperature (c) of the rotary kiln cylinder at 5-15 m position, Δl 1 is the distance (m) of the rotary kiln cylinder at 0-5 m position from the kiln mouth, Δl 2 is the distance (m) of the rotary kiln cylinder at 5-15 m position from the kiln mouth, and Δt 5 is the flame temperature (c) measured by the colorimetric pyrometer, and α, β, γ, μ, v are correction factors.
The correction factors α, β, γ, μ, ν are set in advance and corrected in advance, and the initial values set in advance are obtained by averaging a plurality of actual use cases in the field, and specifically, as shown in table 3 below, the correction can be set individually according to specific situations after the application in the field.
Table 3 correction factors for primary air duct of burner
| Control parameters | α | β | γ | μ | ν |
| ΔP 1 (Cooling wind) | 10～50 | 10～50 | 50～100 | 10～50 | |
| ΔP 2 (axial flow wind) | 50～100 | 50～100 | 30～80 | 30～80 | 1000～2000 |
| ΔP 3 (cyclone wind) | 50～100 | 30～80 | 1000～2000 | 50～100 |
And according to the change condition of the delta T 1～ΔT5,ΔL1～ΔL2 parameter in the real-time monitoring cement sintering DCS control system, taking the average value of each half hour for recording, and then comparing the change condition of the average value of the parameters of the second half hour and the first half hour, and comprehensively judging the change of the flame shape and the temperature distribution in the rotary kiln. And carrying out influence proportion correction by correction factors such as alpha, beta, gamma and the like according to the change amplitude of the parameters, and calculating the pressure value of the air duct of the optimized burner, so as to obtain an optimization scheme aiming at the current flame shape and temperature distribution, and controlling an electric actuator to adjust valves on each primary air duct of the burner by a PLC control system, thereby controlling the ventilation quantity of the air duct to reach the required pressure value.
Because the change speed of the flame shape in the rotary kiln is slower, the influence of short-time fluctuation on optimization is avoided, parameter average value calculation and change condition recording are carried out by taking each half hour as a period, then the primary air duct pressure of the burner is calculated, and the optimization parameters are adjusted; and meanwhile, the fluctuation of working conditions in the rotary kiln caused by frequent adjustment of burner parameters is avoided.
In order to prevent the primary air duct pressure of the burner from greatly fluctuating and exceeding the working condition adjusting range, the primary air duct pressure deltaP 1～ΔP3 of the burner is provided with a maximum value and a minimum value, and an adjustment extremum for real-time optimization adjustment variation, namely the air duct pressure variation cannot exceed 30% of the maximum pressure, as shown in the table 2.
Table 4 burner primary air duct pressure setting data
| Control parameters | Maximum value | Minimum value | Adjusting extremum |
| ΔP 1 (Cooling wind) | 20000 | 800 | 300 |
| ΔP 2 (axial flow wind) | 80000 | 30000 | 5000 |
| ΔP 3 (cyclone wind) | 45000 | 20000 | 5000 |
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (4)
1. The control method of the intelligent control system of the cement rotary kiln burner is characterized in that the intelligent control system of the cement rotary kiln burner comprises the following steps:
The cement sintering DCS control system is used for collecting related parameters of the rotary kiln of the cement sintering system and transmitting the related parameters to the PLC control system, wherein the related parameters comprise secondary air temperature, kiln tail smoke chamber temperature and kiln cylinder scanning temperature;
The pressure transmitters are arranged on pressure measuring points of all primary air channels of the burner, and are used for measuring the corresponding pressure of all primary air channels of the burner and converting pressure data into digital signals to be transmitted to the PLC control system;
The electric actuator is used for controlling the valves on the primary air channels of the burner so as to adjust the ventilation quantity, thereby controlling the flame shape and the temperature distribution in the rotary kiln;
the input end of the PLC control system is respectively connected with the cement burning DCS control system and the pressure transmitter, and the output end of the PLC control system is connected with the electric actuator; the PLC control system is used for analyzing and calculating to obtain the pressure required by each primary air duct of the burner according to the acquired related parameters of the rotary kiln, comparing the calculated pressure required by each primary air duct of the burner with pressure data returned by the pressure transmitter, and controlling the electric actuator to adjust the valve of the corresponding air duct of the burner to the required pressure if the pressure of the corresponding air duct has deviation;
According to the control method, a specific control algorithm is adopted by the PLC control system, the secondary air temperature, the kiln tail smoke chamber temperature and the kiln cylinder scanning temperature parameters acquired by the cement firing DCS control system are analyzed and judged, the pressure required by each primary air duct of the optimized combustor is calculated, the calculated pressure required by each primary air duct of the combustor is compared with pressure data returned by a pressure transmitter, if deviation exists in the pressure of the corresponding air duct, a control signal is sent to an electric actuator, and a valve on the corresponding air duct is regulated to regulate the pressure of the corresponding air duct to the required pressure;
when the burner is divided into four-air-duct single-fan burners, the control algorithm of the pressure required by each primary air duct is as follows:
ΔP1＝α×ΔT1+β×ΔT3+γ×ΔL1+μ×ΔT5
ΔP2＝α×ΔT1+β×ΔT2+γ×ΔT3+μ×ΔT4+ν×ΔL1+ω×ΔL2
ΔP3＝α×ΔT2+β×ΔT4+γ×ΔL2+μ×ΔT5
Wherein: Δp 1 is the pressure (Pa) of the axial flow duct, Δp 2 is the pressure (Pa) of the external swirl duct, Δp 3 is the pressure (Pa) of the internal swirl duct, Δt 1 is the secondary air temperature (c), Δt 2 is the kiln tail smoke chamber temperature (c), Δt 3 is the maximum temperature (c) of the rotary kiln cylinder at 0-5 m position, Δt 4 is the maximum temperature (c) of the rotary kiln cylinder at 5-15 m position, Δl 1 is the distance (m) of the rotary kiln cylinder at 0-5 m position from the kiln mouth, Δl 2 is the distance (m) of the rotary kiln cylinder at 5-15 m position from the kiln mouth, and Δt 5 is the flame temperature (c) measured by a colorimetric pyrometer, α, β, γ, μ, ν, w are correction factors;
When the burner is divided into four-channel double-fan burners, the control algorithm of the pressure required by each primary air duct is as follows:
ΔP1＝α×ΔT1+β×ΔT3+γ×ΔL1+μ×ΔT5
ΔP2＝α×ΔT1+β×ΔT2+γ×ΔT3+ν×ΔL1+μ×ΔT5
ΔP3＝α×ΔT2+β×ΔT4+γ×ΔL2+μ×ΔT5
Wherein: Δp 1 is the pressure (Pa) of the cooling air duct, Δp 2 is the pressure (Pa) of the axial flow air duct, Δp 3 is the pressure (Pa) of the rotational flow air duct, Δt 1 is the secondary air temperature (c), Δt 2 is the kiln tail smoke chamber temperature (c), Δt 3 is the highest temperature (c) of the rotary kiln cylinder at 0-5 m position, Δt 4 is the highest temperature (c) of the rotary kiln cylinder at 5-15 m position, Δl 1 is the distance (m) of the rotary kiln cylinder at 0-5 m position from the kiln mouth, Δl 2 is the distance (m) of the rotary kiln cylinder at 5-15 m position from the kiln mouth, and Δt 5 is the flame temperature (c) measured by the colorimetric pyrometer, and α, β, γ, μ, v are correction factors.
2. The control method of intelligent control system of cement rotary kiln burner according to claim 1, wherein parameters of secondary air temperature, kiln tail flue gas chamber temperature and kiln cylinder scanning temperature in the cement burning DCS control system are calculated by taking every half hour as a period.
3. The control method of intelligent control system of cement rotary kiln burner according to claim 2, characterized in that the change of flame shape and temperature distribution in the rotary kiln is comprehensively judged according to the change condition of the average value of parameters in the second half hour and the first half hour, the influence proportion correction is carried out according to the change amplitude of the parameters, and then the optimized burner air duct pressure value is calculated.
4. The method for controlling intelligent control system of rotary cement kiln burner according to claim 1, wherein the maximum and minimum values of the primary air duct pressure of the burner and the adjustment extremum of the real-time optimal adjustment variation are set, and the adjustment extremum does not exceed 30% of the maximum pressure.
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