CN113433987A - Denitration reactor temperature control system and control method thereof - Google Patents
Denitration reactor temperature control system and control method thereof Download PDFInfo
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Abstract
The denitration reactor temperature control system provided by the embodiment of the application comprises a reactor temperature detection device, an isobaric distribution box temperature detection device, a smoke flow detection device, a gas pressure detection device, a model prediction controller, a programmable logic controller, a cold air valve and a hot blast stove load regulating valve, wherein the reactor temperature detection device, the isobaric distribution box temperature detection device, the smoke flow detection device, the gas pressure detection device, the programmable logic controller, the cold air valve and the hot blast stove load regulating valve are all in communication connection with the model prediction controller, and according to the detection values of the reactor temperature detection device, the isobaric distribution box temperature detection device, the smoke flow detection device and the gas pressure detection device, the cold air valve opening and the hot blast stove load regulating valve opening obtained by the model prediction controller are adjusted according to the adjustment results of the cold air valve opening and the hot blast stove load regulating valve opening, and the adjusted cold air valve opening and hot blast stove load regulating valve opening, the model predictive controller adjusts the model, improving the control accuracy of controlling the temperature of the reactor.
Description
Technical Field
The application relates to the field of selective catalytic reduction denitration, in particular to a temperature control system of a denitration reactor and a control method thereof.
Background
In order to prevent the environment pollution caused by excessive nitrogen oxides generated after the coal in the boiler is combusted, the coal is subjected to denitration treatment. The selective catalytic reduction method is widely applied to denitration treatment of coal in the field of flue gas denitration, and is a technology with mature technology and good effect. The temperature of sintering flue gas denitration system's reactor is crossed lowly, and sulfur trioxide in the sintering flue gas can react with ammonia and water and generate ammonium bisulfate, and ammonium bisulfate has corrosivity and cohesiveness, can cause ammonia escape volume increase, catalyst to block up to lead to the denitration effect relatively poor. The reactor of sintering flue gas denitration system's high temperature can cause the reactor to damage, causes adverse effect to the denitration process to lead to the denitration effect relatively poor.
In order to avoid poor denitration effect caused by too low or too high temperature of the reactor, it is important to control the temperature of the reactor. When the temperature of the reactor is controlled at 300 ℃, the optimal denitration chemical reaction condition is achieved, and the flue gas denitration effect is optimal. In the prior art, the PID control algorithm is adopted to control the temperature of the reactor, however, the temperature adjusting process of the reactor is influenced by various variables, and the control precision of the PID control algorithm for controlling the temperature of the reactor is low.
Disclosure of Invention
The application provides a denitration reactor temperature control system and a control method thereof, which aim to solve the technical problem of low control precision of controlling the temperature of a reactor.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
in a first aspect, the embodiment of the application discloses a denitration reactor temperature control system, which comprises a reactor temperature detection device, an isobaric distribution box temperature detection device, a flue gas flow detection device, a coal gas pressure detection device, a model prediction controller, a programmable logic controller, a cold air valve and a hot air furnace load regulating valve, wherein the reactor temperature detection device, the isobaric distribution box temperature detection device, the flue gas flow detection device, the coal gas pressure detection device, the programmable logic controller, the cold air valve and the hot air furnace load regulating valve are all in communication connection with the model prediction controller.
Optionally, the reactor temperature detection device and the isobaric distribution box temperature detection device are thermal resistors.
Optionally, the flue gas flow detection device is a flow detection instrument.
Optionally, the gas pressure detection device is a pressure transmitter.
In a second aspect, the embodiment of the application discloses a denitration reactor temperature control method, which comprises the steps that a programmable logic controller obtains detection data including reactor temperature, isobaric distribution box temperature, flue gas flow, gas pressure, cold air valve opening and hot blast stove load regulating valve opening in real time;
the model prediction controller adopts a dynamic matrix prediction control algorithm, establishes a first dynamic matrix prediction control model according to the detection data, and determines the associated parameters and the order of the dynamic matrix;
the model prediction controller acquires detection data sent by the programmable logic controller in real time, and the model prediction controller obtains a predicted adjustment result in real time through a first dynamic matrix prediction control model by adopting a model prediction control algorithm;
and the model prediction controller sends the adjustment result to the programmable logic controller, and an analog output module of the programmable logic controller controls the cold air valve and the hot blast stove load adjusting valve to adjust the opening.
Optionally, after the model predictive controller sends the adjustment result to the programmable logic controller, and the analog output module of the programmable logic controller controls the cold air valve and the hot-blast stove load regulating valve to adjust the opening degree, the method further comprises:
and the model predictive controller updates the first dynamic matrix predictive control model according to the obtained adjustment result and the detection data to obtain a second dynamic matrix predictive control model.
Optionally, the model predictive controller obtains the detection data sent by the programmable logic controller in real time, and the model predictive controller obtains the predicted adjustment result in real time through the first dynamic matrix predictive control model by using a model predictive control algorithm, including:
detecting reactor temperature and isobaric distribution box temperature in data as target variables, smoke flow and gas pressure in the data as interference variables, and opening of a cold air valve and opening of a hot blast stove load adjusting valve in the data as control variables;
the adjustment result is a predicted set value of the control variable derived by the model predictive controller.
The beneficial effect of this application does:
the denitration reactor temperature control system that this application embodiment provided, including reactor temperature detection device, isobaric distributor box temperature detection device, flue gas flow detection device, coal gas pressure detection device, model predictive control ware, programmable logic controller, cold-blast furnace load control valve, reactor temperature detection device, isobaric distributor box temperature detection device, flue gas flow detection device, coal gas pressure detection device, programmable logic controller, cold-blast furnace load control valve all are connected with model predictive control ware communication. The detection values of the reactor temperature detection device, the isobaric distribution box temperature detection device, the flue gas flow detection device, the gas pressure detection device, the cold air valve and the hot blast stove load adjusting valve are all sent to the model prediction controller through the programmable logic controller, the real-time performance of the detection values obtained by the model prediction controller is improved, the model prediction controller builds a model, the adjustment results of the cold air valve opening and the hot blast stove load adjusting valve opening are obtained according to the detection values of the reactor temperature detection device, the isobaric distribution box temperature detection device, the flue gas flow detection device and the gas pressure detection device, the modeling of the model prediction controller is adopted to improve the convenience of modeling and model use, the time of obtaining the adjustment results through the model is shortened, the speed of controlling the temperature of the reactor is improved, and the adjustment results of the cold air valve opening and the hot blast stove load adjusting valve opening are obtained according to the cold air, The model prediction controller adjusts the model, and improves the control precision of controlling the temperature of the reactor by improving the accuracy of the model.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a denitration reactor temperature control system provided in an embodiment of the present application;
FIG. 2 is a schematic flow chart of a denitration reactor temperature control method provided in an embodiment of the present application;
wherein:
1-reactor temperature detection device, 2-isobaric distribution box temperature detection device, 3-flue gas flow detection device, 4-gas pressure detection device, 5-model prediction controller, 6-programmable logic controller, 7-cold air valve and 8-hot air furnace load regulation valve.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate the technical solution of the present application, some concepts related to the present application will be described below.
The temperature of the reactor is the temperature in the denitration reaction process, the temperature of the isobaric distribution box is the temperature of hot air in the hot air furnace, the flue gas flow is the total flue gas load in the denitration process, the gas pressure is the gas supply pressure of gas, the detection value of the cold air valve is the opening degree of the cold air valve, and the detection value of the hot air furnace load adjusting valve is the opening degree of the hot air furnace load adjusting valve.
Referring to fig. 1, the denitration reactor temperature control system provided in the embodiment of the present application includes a reactor temperature detection device 1, an isobaric distribution box temperature detection device 2, a flue gas flow detection device 3, a gas pressure detection device 4, a model predictive controller 5, a programmable logic controller 6, a cold air valve 7 and a hot-blast stove load regulating valve 8, and the reactor temperature detection device 1, the isobaric distribution box temperature detection device 2, the flue gas flow detection device 3, the gas pressure detection device 4, the programmable logic controller 6, the cold air valve 7 and the hot-blast stove load regulating valve 8 are all in communication connection with the model predictive controller 5. The detection values of the reactor temperature detection device 1, the isobaric distribution box temperature detection device 2, the smoke flow detection device 3 and the gas pressure detection device 4 are all sent to the model prediction controller 5 through the programmable logic controller 6, the real-time performance of the detection values obtained by the model prediction controller 5 is improved, the model prediction controller 5 constructs a model, the adjustment results of the cold air valve opening degree and the hot blast stove load adjusting valve opening degree are obtained according to the detection values of the reactor temperature detection device 1, the isobaric distribution box temperature detection device 2, the smoke flow detection device 3 and the gas pressure detection device 4, the modeling and the use convenience of the model are improved by adopting the model prediction controller 5, the time of obtaining the adjustment results through the model is shortened, the speed of controlling the temperature of the reactor is improved, and the adjustment results of the cold air valve opening degree and the load adjusting valve opening degree are obtained according to the cold air valve opening degree and the load, The reactor temperature detection device 1, the isobaric distribution box temperature detection device 2, the flue gas flow detection device 3, the coal gas pressure detection device 4, the cold air valve 7 and the hot blast stove load adjusting valve 8, and the model prediction controller 5 adjusts the model, so that the control accuracy of controlling the temperature of the reactor is improved by improving the accuracy of the model.
In some embodiments, both the reactor temperature sensing device 1 and the isobaric distribution box temperature sensing device 2 may be selected as thermal resistors.
In some embodiments, the flue gas flow detection device 3 can be selected as a flow meter, and the gas pressure detection device 4 can be selected as a pressure transmitter. The detection values of the flue gas flow detection device 3 and the gas pressure detection device 4 are current signals representing the detection values, and the magnitude of the current signals is 4-20 milliamperes.
Corresponding to the embodiments of the denitration reactor temperature control system, the application also provides embodiments of a denitration reactor temperature control method. Referring to fig. 2, the embodiment of the present application provides a denitration reactor temperature control method, which can solve the problem of low control accuracy of controlling the temperature of a reactor, and for example, the method may include steps S110 to S140.
Step S110: the programmable logic controller obtains detection data including the temperature of the reactor, the temperature of the isobaric distribution box, the flow rate of flue gas, the pressure of coal gas, the opening degree of a cold air valve and the opening degree of a load regulating valve of the hot blast stove in real time.
Step S120: the model predictive controller adopts a dynamic matrix predictive control algorithm, establishes a first dynamic matrix predictive control model according to the detection data, and determines the associated parameters and the order of the dynamic matrix.
In some embodiments, the first dynamic matrix predictive control model may be constructed by a modeling system of an external model predictive controller, and the external model predictive controller introduces the first dynamic matrix predictive control model into the model predictive controller.
Step S130: the model prediction controller obtains the detection data sent by the programmable logic controller in real time, and the model prediction controller obtains a predicted adjustment result in real time through the first dynamic matrix prediction control model by adopting a model prediction control algorithm.
In some embodiments, the reactor temperature and the isobaric distribution box temperature in the detection data are used as target variables, the reactor temperature is a main control target of the denitration reactor temperature control method provided by the embodiment of the application, the isobaric distribution box temperature is a secondary control target of the denitration reactor temperature control method provided by the embodiment of the application, the isobaric distribution box temperature is lower than a set temperature value, the flue gas flow and the gas pressure in the detection data are used as disturbance variables, the disturbance variables can influence the control of the target variables, the cold air valve opening and the hot blast stove load regulating valve opening in the low detection data are used as control variables, on the basis of realizing the control of the target variable, the denitration reactor temperature control method provided by the embodiment of the application enables the value of the controlled variable to be as low as possible, and the adjustment result is the predicted set value of the controlled variable obtained by the model prediction controller.
Step S140: and the model prediction controller sends the adjustment result to the programmable logic controller, and an analog output module of the programmable logic controller controls the cold air valve and the hot blast stove load adjusting valve to adjust the opening.
In some embodiments, after the model predictive controller sends the adjustment result to the programmable logic controller, and the analog output module of the programmable logic controller controls the cold air valve and the hot air furnace load regulating valve to adjust the opening degree, the model predictive controller updates the first dynamic matrix predictive control model according to the obtained adjustment result and the obtained detection data, so as to obtain the second dynamic matrix predictive control model. The model prediction controller adjusts the model according to the adjustment result and the detection data, the control precision of controlling the temperature of the reactor is improved by improving the accuracy of the model, the model prediction controller can receive the detection data in real time, the model prediction controller can obtain the adjustment result in real time according to the second dynamic matrix prediction control model, and the programmable logic controller can control the cold air valve and the hot air furnace load adjusting valve to adjust the opening degree in real time.
It can be seen from the foregoing embodiments that the denitration reactor temperature control system provided in the embodiments of the present application includes a reactor temperature detection device, an isobaric distribution box temperature detection device, a flue gas flow detection device, a gas pressure detection device, a model prediction controller, a programmable logic controller, a cold air valve and a hot air furnace load adjustment valve, wherein the reactor temperature detection device, the isobaric distribution box temperature detection device, the flue gas flow detection device, the gas pressure detection device, the programmable logic controller, the cold air valve and the hot air furnace load adjustment valve are all in communication connection with the model prediction controller, and detection values of the reactor temperature detection device, the isobaric distribution box temperature detection device, the flue gas flow detection device, the gas pressure detection device, the cold air valve and the hot air furnace load adjustment valve are all sent to the model prediction controller through the programmable logic controller, so as to improve the real-time of detection values obtained by the model prediction controller, the model predictive controller is adopted for modeling, so that the convenience of modeling and the use of the model are improved, thereby shortening the time for obtaining the adjustment result through the model, improving the speed for controlling the temperature of the reactor, according to the adjustment results of the opening of the cold air valve and the opening of the hot blast furnace load regulating valve, the detection values of the reactor temperature detection device, the isobaric distribution box temperature detection device, the flue gas flow detection device, the coal gas pressure detection device, the cold air valve and the hot blast furnace load regulating valve, the model prediction controller adjusts the model, by improving the accuracy of the model, the control precision of controlling the temperature of the reactor is improved.
As can be seen from the above embodiments, the denitration reactor temperature control method provided in the embodiments of the present application includes that the programmable logic controller obtains, in real time, detection data including reactor temperature, isobaric distribution box temperature, flue gas flow, gas pressure, cold air valve opening, and hot blast stove load adjustment valve opening, the model predictive controller adopts a dynamic matrix predictive control algorithm, establishing a first dynamic matrix predictive control model according to the detection data, determining the associated parameters and the order of the dynamic matrix, acquiring the detection data sent by the programmable logic controller in real time by the model predictive controller, adopting a model predictive control algorithm by the model predictive controller, obtaining the predicted adjustment result in real time through the first dynamic matrix predictive control model, sending the adjustment result to the programmable logic controller by the model predictive controller, and an analog quantity output module of the programmable logic controller controls the cold air valve and the hot blast stove load regulating valve to regulate the opening degree. The model prediction controller acquires the detection data sent by the programmable logic controller in real time, so that the real-time performance of the model prediction controller in acquiring the detection data is improved. The model predictive controller adopts a dynamic matrix predictive control algorithm, establishes a first dynamic matrix predictive control model according to detection data, obtains a predicted adjusting result in real time through the first dynamic matrix predictive control model, adopts the model predictive controller to build a model, improves the convenience of modeling and using the model, further shortens the time for obtaining the adjusting result through the model, improves the speed for controlling the temperature of the reactor, and improves the control precision for controlling the temperature of the reactor by improving the accuracy of the model through adjusting the model according to the adjusting result and the detection data.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (7)
1. A denitration reactor temperature control system, comprising: reactor temperature-detecting device (1), isobaric distributor box temperature-detecting device (2), flue gas flow detection device (3), gas pressure-detecting device (4), model predictive control ware (5), programmable logic controller (6), cold blast valve (7) and hot-blast furnace load governing valve (8), reactor temperature-detecting device (1) isobaric distributor box temperature-detecting device (2) flue gas flow detection device (3) gas pressure-detecting device (4) programmable logic controller (6) cold blast valve (7) and hot-blast furnace load governing valve (8) all with model predictive control ware (5) communication connection.
2. The denitration reactor temperature control system according to claim 1, wherein the reactor temperature detecting means (1) and the isobaric distribution box temperature detecting means (2) are both thermal resistors.
3. The denitration reactor temperature control system according to claim 1, wherein the flue gas flow rate detection device (3) is a flow rate detection instrument.
4. The denitration reactor temperature control system according to claim 1, wherein the gas pressure detection device (4) is a pressure transmitter.
5. A denitration reactor temperature control method is characterized by comprising the following steps:
the programmable logic controller acquires detection data comprising the temperature of the reactor, the temperature of the isobaric distribution box, the flow rate of flue gas, the pressure of coal gas, the opening degree of a cold air valve and the opening degree of a load regulating valve of a hot blast stove in real time;
the model prediction controller adopts a dynamic matrix prediction control algorithm, establishes a first dynamic matrix prediction control model according to the detection data, and determines the associated parameters and the order of the dynamic matrix;
the model prediction controller acquires the detection data sent by the programmable logic controller in real time, and the model prediction controller adopts a model prediction control algorithm to obtain a predicted adjustment result in real time through the first dynamic matrix prediction control model;
and the model prediction controller sends the adjustment result to the programmable logic controller, and an analog quantity output module of the programmable logic controller controls the cold air valve and the hot blast stove load adjusting valve to adjust the opening.
6. The denitration reactor temperature control method according to claim 5, wherein after the model predictive controller sends the adjustment result to the programmable logic controller, and an analog output module of the programmable logic controller controls an air cooling valve and a hot blast stove load adjusting valve to adjust the opening degree, the method further comprises:
and the model predictive controller updates the first dynamic matrix predictive control model according to the obtained adjustment result and the obtained detection data to obtain a second dynamic matrix predictive control model.
7. The denitration reactor temperature control method according to claim 5, wherein the model predictive controller obtains the detection data sent by the programmable logic controller in real time, and the model predictive controller adopts a model predictive control algorithm to obtain a predicted adjustment result in real time through the first dynamic matrix predictive control model, and comprises:
the reactor temperature and the isobaric distribution box temperature in the detection data are used as target variables, the flue gas flow and the gas pressure in the detection data are used as interference variables, and the cold air valve opening and the hot blast stove load adjusting valve opening in the detection data are used as control variables;
the adjustment result is a predicted set value of the control variable obtained by the model predictive controller.
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Application publication date: 20210924 |