CN212031960U - Advanced process control system of coal water slurry gasification device and coal water slurry gasification production system - Google Patents
Advanced process control system of coal water slurry gasification device and coal water slurry gasification production system Download PDFInfo
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- CN212031960U CN212031960U CN202020132576.4U CN202020132576U CN212031960U CN 212031960 U CN212031960 U CN 212031960U CN 202020132576 U CN202020132576 U CN 202020132576U CN 212031960 U CN212031960 U CN 212031960U
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Abstract
The application relates to the technical field of coal water slurry gasification, in particular to an advanced process control system of a coal water slurry gasification device and a coal water slurry gasification production system, wherein the advanced process control system of the coal water slurry gasification device comprises a DCS (distributed control system), and the DCS comprises a sensor assembly and a DCS controller assembly which are in communication connection; the control system comprises a real-time data memory, a system model memory, a prediction module and an optimization controller which are connected with each other; the system model memory stores feed system model data and gasification scrubbing and flashing system model data. The application provides a coal slurry gasification device advanced process control system ensures that parameters in the coal slurry gasification process maintain stably, so that the coal slurry gasification device can be kept operating in an optimization interval, the energy consumption in the coal slurry gasification process is reduced, the whole process is automated, the automation degree is higher, the working strength of workers is reduced, and the large error caused by manual adjustment is avoided.
Description
Technical Field
The application relates to the technical field of coal water slurry gasification, in particular to an Advanced Process Control System (APCS) of a coal water slurry gasification device and a coal water slurry gasification production system.
Background
The gasification of coal water slurry is a process of using coal water slurry as raw material, under the condition of pressurization making it produce incomplete combustion with oxygen gas to produce effective gas (CO + H)2) The technological process of the method relates to complex chemical and physical processes of high temperature and high pressure, chemical reaction, mass transfer and heat transfer and the like, and mainly comprises a coal slurry preparation system, a coal water slurry gasification device advanced process control system, a slag water treatment system and the like.
The coal water slurry gasification device is generally provided with a DCS (Distributed Control System), real-time monitoring of the whole process of the device is realized by connecting detection instruments such as temperature, pressure, flow, liquid level and components into the DCS, then the DCS calculates Control actions according to Control targets set by an operator according to conventional PID (proportion, integral, differential) and cascade Control schemes in the DCS, and finally the DCS sends Control results to an adjusting valve, a stop valve, a frequency converter and the like for execution, and the steps are repeated in a circulating mode.
However, the coal water slurry gasification device has complex process and characteristics of multivariable, nonlinearity, strong coupling, large hysteresis and the like, and the conventional single-input single-output PID and other control schemes of the DCS system cannot meet the control requirements. When facing a complex control object, an operator is difficult to accurately predict a future trend and comprehensively coordinate all bottom-layer PID loops, so that the following problems are caused: 1. the fluctuation of important process parameters such as the temperature of the gasification furnace, the water gas component and the like is large, and the device is not stable in operation; 2. the more important loop is the more often the loop is in a manual mode by an operator, the automation level is very low, the manual operation is more, and the working intensity of the operator is very high; 3. the device can not operate in an optimized interval, so that the system has high energy consumption, low yield and the like.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an advanced process control system of a coal water slurry gasification device, and solves the technical problems of low automation and more manual operations of the coal water slurry gasification device, high energy consumption and low yield of the system in the prior art to a certain extent.
The second purpose of this application is to provide a coal slurry gasification production system to solve the coal slurry gasification device that exists among the prior art to a certain extent and move the automation low, manual operation is many, leads to the technical problem that the system energy consumption is high, the yield is low.
The application provides an advanced process control system of a coal water slurry gasification device, which is used for the coal water slurry gasification device, wherein the coal water slurry gasification device comprises a feeding system, a gasification system, a washing system, a flash evaporation system and an execution component, and the execution component is arranged on the feeding system, the gasification system, the washing system and the flash evaporation system;
the advanced process control system of the coal water slurry gasification device comprises:
the DCS comprises a sensor assembly and a DCS controller assembly which are in communication connection;
the system comprises a control system, a prediction module and an optimization controller, wherein the control system comprises a real-time data memory, a system model memory, the prediction module and the optimization controller which are mutually communicated and connected; the system model memory stores feed system model data and gasification washing and flash evaporation system model data;
the real-time data storage and the optimization controller are in communication connection with the DCS controller component; the sensor assembly respectively acquires real-time data of controllable variables of the feeding system, the gasification system, the washing system and the flash evaporation system, and transmits and stores the real-time data to the real-time data storage, and historical data are stored in the real-time data storage;
the prediction module can predict the change trend of the controllable variable in a preset time according to the feeding system model data, the gasification washing and flashing system model data and the historical data;
the optimization controller can calculate an optimal operation amount for the execution assembly according to the change trend and a preset ideal value, and transmits the optimal operation amount to the DCS controller assembly;
and the DCS controller component adjusts the execution component according to the optimal operation amount so that the controllable variable works at the preset ideal value.
In the above technical solution, further, the control system further includes a feedback correction module;
the feedback correction module is respectively in communication connection with the real-time data storage, the system model storage, the prediction module and the optimization controller;
the feedback correction module is configured to modify the feed system model data and the gasification scrubbing and flashing system model data based on the real-time data and the trend.
In any of the above solutions, further, the sensor assembly includes a first sensor assembly and a second sensor assembly;
the first sensor assembly is capable of acquiring first real-time data of a first controllable variable of the feed system and transmitting and storing the first real-time data to the real-time data storage;
the second sensor assembly is capable of acquiring second real-time data of second controllable variables of the gasification system, the scrubbing system, and the flash system, and transmitting and storing the second real-time data to the real-time data storage.
In any of the above technical solutions, further, the optimization controller includes a feed controller and a gasification controller;
the execution components comprise a first execution component arranged on the feeding system and a second execution component arranged on the gasification system, the washing system and the flash evaporation system;
the prediction module can predict a first change trend of the first controllable variable in the preset time according to the first real-time data and the feeding system model data; the feeding controller can calculate a first optimal operation amount for the first executing component according to the first change trend and the preset ideal value;
the prediction module is further capable of predicting a second change trend of the second controllable variable within the preset time according to the second real-time data and the gasification washing and flashing system model data; the gasification controller is capable of calculating a second optimal operation amount for the second execution component based on the second trend of change and the predetermined ideal value.
In any of the above technical solutions, further, the first executing component at least includes a first valve disposed at an outlet of the feeding system;
the first sensor assembly includes at least a flow sensor disposed at an outlet of the feed system;
the feed system model data is control model data of a set quantity of the first actuator assembly to a detected quantity of the first sensor assembly.
In any of the above technical solutions, further, the second performing component at least includes a first black water flow regulating valve disposed between the gasification system and the flash evaporation system, and a second black water flow regulating valve disposed between the washing system and the flash evaporation system;
the second sensor assembly at least comprises a liquid level sensor arranged on the gasification system, an oxygen content sensor arranged on an inlet of the gasification system, a carbon dioxide content detector and a methane content detector arranged on an outlet of the gasification system, and a temperature sensor arranged on an outlet of the washing system;
the gasification washing and flashing system model data is control model data of the set value of the second execution component to the detection quantity of the second sensor component.
In any of the above technical solutions, further, the DCS controller assembly includes a DCS controller, an instruction input device, and a result display device;
the instruction input equipment and the result display equipment are both connected with the DCS controller; the instruction input equipment is used for inputting the threshold value of the operation amount and the threshold value of the controllable variable by an operator;
and the result display equipment is used for monitoring data by operators.
In any of the above technical solutions, further, the method further includes a first communication device, a second communication device, and an OPC server:
the DCS controller assembly is communicated with the OPC server through the first communication device, and the optimization controller is communicated with the OPC server through the second communication device.
In any of the above technical solutions, the control system further includes a system configuration, and the system configuration stores a file path and information required by the operation of the optimization controller, and a server address.
The application also provides a coal water slurry gasification production system, which comprises the advanced process control system of the coal water slurry gasification device in any technical scheme, so that the advanced process control system has all the beneficial technical effects of the advanced process control system of the coal water slurry gasification device, and the details are not repeated herein.
Compared with the prior art, the beneficial effect of this application is:
the application provides a coal slurry gasification device advanced process control system includes: a control system and a DCS system; the DCS comprises a sensor assembly and a DCS controller assembly which are in communication connection, and the control system comprises a real-time data memory, a system model memory, a prediction module and an optimization controller which are in communication connection with each other; the system model memory stores feed system model data and gasification washing and flash evaporation system model data, and provides more accurate simulation environment for predicting the change trend of the module by establishing the plurality of data models, so that the obtained change trend is more fit with the actual change rule, the accuracy of prejudgment is improved, and the optimal operation amount is obtained by comparing the change trend with the preset ideal value, compared with the scheme of control instructions directly obtained by a DCS controller component, the method can be more suitable for the multivariable, nonlinear, strong-coupling and large-lag coal water slurry gasification process of the coal slurry gasification device, ensures that the parameters in the coal slurry gasification process are maintained stable, ensures that the coal slurry gasification device can be operated in an optimized interval, reduces the energy consumption in the coal slurry gasification process, realizes automation in the whole process, and has higher automation degree, the process parameter shifting amplitude is small, and the safety and the stability are improved.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a coal-water slurry gasification apparatus provided in an embodiment of the present application;
fig. 2 is a schematic connection relationship diagram of a control system and a DCS system provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of an optimization controller of an advanced process control system of a coal-water slurry gasification apparatus according to an embodiment of the present application.
Reference numerals: 1-gasification system, 2-washing system, 3-flash evaporation system, 4-DCS system, 5-OPC server, 6-control system, 601-real-time data memory, 602-prediction module, 603-feedback correction module, 604-optimization controller, 6041-feed controller, 6042-gasification controller, 605-system model memory, 606-system configuration, 7-feed system, 701-raw material coal inlet, 702-water inlet, 703-additive inlet and 8-slag-water separation system.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.
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 the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
An advanced process control system of a coal water slurry gasification apparatus and a coal water slurry gasification production system according to an embodiment of the present application are described below with reference to fig. 1 to 3.
Referring to fig. 1 to 3, an embodiment of the present application provides an advanced process control system for a coal water slurry gasification device, which is used for the coal water slurry gasification device, the coal water slurry gasification device includes a gasification system 1, a washing system 2, a flash evaporation system 3, a slag-water separation system 8, and an execution component, and the execution component is disposed in the gasification system 1, the washing system 2, the flash evaporation system 3, and the slag-water separation system 8.
In addition, the water-coal-slurry gasification device also comprises a slag-water separation system 8.
Specifically, referring to fig. 1 to 3, the working principle of the coal-water slurry gasification device is as follows: the feeding system 7 is sequentially communicated with a gasification system 1 (the gasification system 1 in this embodiment may be a gasification furnace), a washing system 2 (the washing system 2 in this embodiment may be a washing tower), and meanwhile, the gasification system 1 and the washing system 2 are also respectively communicated with a flash evaporation system 3 in this embodiment, the flash evaporation system 3 may be a high-pressure flash evaporation tower with a certain pressure, and the flash evaporation system 3 is also communicated with a slag-water separation system 8; the slag-water separation system 8 is simultaneously and respectively communicated with the washing system 2 and the feeding system 7; the feeding system 7 is provided with a raw material coal inlet 701, a water inlet 702 and an additive inlet 703, so that a necessary environment for preparing coal slurry is formed inside the feeding system 7, the coal water slurry a prepared by the feeding system 7 enters the gasification system 1, the gasification system 1 is provided with an oxygen inlet for supplying oxygen b to the gasification system 1 and generating water gas c, then the water gas c enters the washing system 2 for washing, and after washing is completed, crude gas d is formed and discharged out of the washing system 2 for collection;
the gasified black water c discharged by the gasification system 1 and the washing black water f discharged by the washing system 2 are discharged into the flash evaporation system 3 for treatment and then discharged, the black water discharged by the flash evaporation system 3 enters the slag-water separation system 8 for screening, a part of the separated grey water g flows into the feeding system 7 for liquid supply, the other part of the grey water g enters the washing system 2 for liquid supply, and the filter residue h separated by the slag-water separation system 8 is discharged out of the slag-water separation system 8 for uniform collection treatment.
The advanced process control system of the coal water slurry gasification device comprises: the DCS system 4 comprises a sensor assembly and a DCS controller assembly which are in communication connection;
the control system 6, the control system 6 comprises a real-time data memory 601, a system model memory 605, a prediction module 602 and an optimization controller 604 which are mutually connected in a communication way;
the system model memory 605 stores feed system model data and gasification washing and flash evaporation system model data, the feed system model data and the gasification washing and flash evaporation system model data are model data of a multi-input multi-output mode obtained by taking the gasification system 1, the washing system 2, the flash evaporation system 3 and the slag-water separation system 8 as modeling objects, and the working mechanism of the gasification system 1, the washing system 2, the flash evaporation system 3 and the slag-water separation system 8 can be simulated more accurately, so that the process mechanism of the coal water slurry gasification device is simulated more accurately;
the real-time data memory 601 and the optimization controller 604 are in communication connection with the DCS controller component; the sensor assembly respectively acquires real-time data of controllable variables of the gasification system 1, the washing system 2, the flash evaporation system 3 and the slag-water separation system 8, and transmits and stores the real-time data to the real-time data storage 601, historical data are stored in the real-time data storage 601, it should be noted that communication connection means that electric signals can be transmitted between two connected components, and specifically, the communication connection can be either wired communication or wireless communication.
The prediction module 602 can predict a variation trend of the controllable variable within a preset time according to the feed system model data, the gasification scrubbing and flashing system model data and the historical data;
the optimization controller 604 can calculate an optimal operation amount for the execution component according to the variation trend and a predetermined ideal value, and transmit the optimal operation amount to the DCS controller component;
and the DCS controller component adjusts the execution component according to the optimal operation quantity so that the controllable variable works at a preset ideal value.
The application provides a coal slurry gasification device advanced process control system includes: a gasification system 1 and a DCS system 4; the DCS system 4 comprises a sensor assembly and a DCS controller assembly which are in communication connection, and the control system 6 comprises a real-time data memory 601, a system model memory 605, a prediction module 602 and an optimization controller 604 which are in communication connection with each other; the system model memory 605 stores the feeding system model data and the gasification washing and flash evaporation system model data, provides a more accurate simulation environment for the prediction module 602 to predict the variation trend by establishing the plurality of data models, so that the obtained variation trend is more fit with the actual variation rule, the accuracy of prejudgment is improved, the optimum operation amount obtained by comparing the variation trend with the preset ideal value can be more suitable for the multivariable, nonlinear, strong-coupling and large-lag coal water slurry gasification process of the coal water slurry gasification device compared with the scheme of the control instruction directly obtained by the DCS controller component, the parameters in the coal water slurry gasification process are ensured to be maintained stable, the coal water slurry gasification device can be kept to operate in an optimized interval, the energy consumption in the coal slurry gasification process is reduced, the automation in the whole process is realized, and the automation degree is higher, the process parameter shifting amplitude is small, and the safety and the stability are improved.
It should be noted that the control system 6 develops a logic (program) interacting with the control system 6 and a program for automatically flushing and switching the black water discharge valve in the DCS system 4, and the program mainly includes watchdog logic (communication handshake logic), control device switching logic, loop switching logic, out-of-limit or stuck-limit alarm, and the like, so that the control system 6 can control the DCS system 4 to automatically switch and control the coal water slurry gasification device, and automatically flush, discharge and operate the black water.
In an alternative of this embodiment, the control system 6 further comprises a feedback correction module 603;
the feedback correction module 603 is respectively connected with the real-time data memory 601, the system model memory 605, the prediction module 602 and the optimization controller 604 in communication; the feedback correction module 603 is configured to modify the feed system model data and the gasification scrubbing and flashing system model data based on the real-time data and the trend of change.
The model data of the feeding system and the model data of the gasification washing and flash evaporation system are continuously corrected by the feedback correction module 603, so that the excessive deviation of the operation amount calculated by the control system 6 from an ideal state caused by model mismatch or environmental interference of the coal water slurry gasification device can be prevented.
Optionally, the real-time data storage 601 is used to store real-time data of the DCS system 4 during operation of the control system 6 and all relevant information of the prediction module 602, the feedback corrector and the optimization controller 604, including but not limited to process data, operation records, modification records, fault and error diagnosis records, etc., so as to facilitate system debugging or problem analysis.
In an alternative of this embodiment, the sensor assembly includes a first sensor assembly and a second sensor assembly;
the first sensor assembly is capable of acquiring first real-time data of a first controllable variable of the gasification system 1, and transmitting and storing the first real-time data to the real-time data storage 601; the second sensor assembly is capable of acquiring second real-time data of second controllable variables of the washing system 2, the flash system 3 and the slag-water separation system 8, and transmitting and storing the second real-time data to the real-time data storage 601.
The gasification system 1, the washing system 2, the flash evaporation system 3 and the slag-water separation system 8 are respectively detected through the first sensor assembly and the second sensor assembly so as to monitor the working states of the gasification system, the washing system and the flash evaporation system.
In an alternative to this embodiment, the optimizer controller 604 includes a feed controller 6041 and a gasification controller 6042;
the execution components comprise a first execution component arranged in the gasification system 1 and a second execution component arranged in the washing system 2, the flash evaporation system 3 and the slag-water separation system 8;
the prediction module 602 can predict a first variation trend of the first controllable variable within a preset time according to the first real-time data and the feeding system model data; the feed controller 6041 is capable of calculating a first optimum operation amount for the first actuator assembly based on the first tendency of change and a predetermined ideal value;
the prediction module 602 is further capable of predicting a second variation trend of the second controllable variable within a preset time according to the second real-time data storage 601 and the model data of the gasification washing and flashing system; the gasification controller 6042 can calculate a second optimum operation amount for the second execution component from the second tendency of change and the predetermined ideal value.
In this embodiment, the optimal control capability of the optimal controller 604 is significantly improved by the cooperative use of the feedstock controller 6041, the gasification controller 6042, the first actuator assembly, the second actuator assembly, the first sensor assembly, and the second sensor assembly.
Wherein, optionally, the optimization controller 604 is a rolling optimization controller 604, and the control algorithm can be calculated in each predetermined work cycle to minimize the error of the controlled variable from a desired track in a future time interval. The roll optimization controller 604 can compensate for uncertainty due to model mismatch, time variation, interference, etc. in time, so that control remains practically optimal, so that the controllable variable is closest to the predetermined ideal value within a preset time period.
Optionally, the optimization calculation period of the rolling optimization controller 604 is 30 seconds, and in this embodiment, the given period is performed every 30 seconds, so as to be based on the optimal repetition frequency in the operation of the coal-water slurry gasification device, of course, the predetermined work period may be adjusted according to the actual situation, and is not limited to 30 seconds.
In an alternative of this embodiment, the first executing component at least comprises a first valve arranged at the outlet of the feeding system 7, and is used for controlling the amount of the coal water slurry a which is introduced into the gasification system 1 through the feeding system 7;
the first sensor component at least comprises a flow sensor arranged on the feeding system 7 and is used for detecting the amount of the coal water slurry a which is introduced into the gasification system 1 through the feeding system 7;
the feed system model data is control model data of a set quantity of the first actuator assembly to a detected quantity of the first sensor assembly.
Wherein, the coal slurry feeding model comprises:
(1) a control model of coal feeding flow to the liquid level of the coal slurry tank;
(2) the interference model of the coal slurry feeding to the liquid level of the coal slurry tank.
That is to say, the multi-input multi-output control model of the feeding model data component can be more closely matched with the actual working mechanism of the coal water slurry gasification device, thereby being beneficial to accurately simulating the variation trend of the coal water slurry gasification device and enabling the operation process of the coal water slurry gasification device to be comprehensively and finely automated.
Further, the second executing component at least comprises a first black water flow regulating valve arranged between the gasification system 1 and the flash evaporation system 3 and a second black water flow regulating valve arranged between the washing system 2 and the flash evaporation system 3;
the second sensor assembly at least comprises a liquid level sensor arranged in the gasification system 1 and is used for detecting the liquid level height in the gasification system; an oxygen b content sensor provided at an inlet of the gasification system 1, for detecting an amount of oxygen b entering the gasification system 1; the system comprises a carbon dioxide content detector and a methane content detector which are arranged at the outlet of a gasification system 1, and a temperature sensor which is arranged at the outlet of a washing system 2 and is used for detecting the content of carbon dioxide and methane in the crude gas d formed after gasification and the temperature of the crude gas d;
the gasification washing and flashing system model data is control model data of the set value of the second execution component to the detection quantity of the second sensor component.
It should be noted that the coal water slurry gasification device further includes a venturi mixer (venturi for short) for mixing a part of the coal gas with the chilling water (which is a common process for preparing the coal gas in the prior art), and the second sensor component further includes a pressure sensor for measuring an inlet of the venturi mixer, that is, the controllable variables further include, but are not limited to, a flow rate e of the gasified black water flowing out through the gasification system 1, a flow rate f of the scrubbing black water flowing out through the scrubbing system 2, and a pressure difference at the inlet of the venturi mixer.
In addition, the second sensor assembly further comprises a pressure sensor, which is arranged in the gasification system 1 (also referred to as gasification furnace) and is used for detecting the pressure in the gasification system 1;
the second sensor assembly further comprises a temperature sensor for detecting the temperature within the gasification system 1.
That is, the controlled variables specifically include, but are not limited to, the flow rate of the coal water slurry a entering the gasification system 1, the amount of oxygen b entering the gasification system 1, the pressure and temperature inside the gasification system 1, and the contents of carbon dioxide and methane in the raw gas d.
Specifically, the gasification scrubbing and flashing system model data includes:
(1) controlling the opening degree of a downstream section valve to the pressure of the gasification furnace;
(2) a control model of the coal slurry flow to the temperature of the gasification furnace;
(3) a control model of total flow of oxygen to the temperature of the gasification furnace;
(4) a control model of the central oxygen flow to the central oxygen proportion;
(5) a control model of the total flow of oxygen to the proportion of central oxygen;
(6) a control model of coal slurry flow to oxygen-coal ratio;
(7) a control model of oxygen total flow to oxygen-coal ratio;
(8) coal slurry flow rate to crude gas CO2(carbon dioxide) content control model;
(9) total flow of oxygen to CO2A control model of content;
(10) coal slurry flow rate to raw gas CH4A control model for (methane) content;
(11) total flow of oxygen to CH4A control model of content;
(12) a control model of chilling water flow rate to venturi inlet pressure difference;
(13) a control model of the opening of the black water flow valve at the outlet of the gasification furnace to the pressure difference of the venturi inlet;
(14) a control model of the opening of the black water flow valve at the outlet of the gasification furnace for controlling the flow of the black water at the outlet of the gasification furnace;
(15) a control model of the total flow of oxygen to the liquid level of the gasification furnace;
(16) a control model of chilling water flow to the liquid level of the gasification furnace;
(17) a control model of the degree of opening of a black water flow valve at the outlet of the gasification furnace on the liquid level of the gasification furnace;
(18) a control model of chilling water flow and the temperature of the crude gas at the outlet of the washing tower;
(19) a control model of the opening of the black water flow valve at the outlet of the gasification furnace on the temperature of the crude gas at the outlet of the washing tower;
(20) a control model of the pressure of the high-pressure flash tower to the temperature of the raw gas at the outlet of the washing tower;
(21) a control model of the temperature of the ash water returned to the washing tower for controlling the temperature of the crude gas at the outlet of the washing tower;
(22) a control model of the pressure of the high-pressure flash tower on the flow of black water at the outlet of the washing tower;
(23) a control model of the opening of a black water flow valve at the outlet of the gasification furnace on the liquid level of the washing tower;
(24) a control model of the black water valve position of the tower kettle of the washing tower to the liquid level of the washing tower;
(25) a control model of the pressure of the high-pressure flash tower to the liquid level of the washing tower;
(26) a control model of the flow of condensed liquid entering the lower part of the washing tower to the liquid level of the washing tower;
(27) a control model of the black water valve position of the tower kettle of the washing tower to the grey water pressure;
(28) and the control model is used for converting the liquid level of the condensate tank by the flow of the condensate entering the lower part of the washing tower.
Namely, a multi-input and multi-output control model is established by using model data of the gasification washing and flash evaporation system, and the model data can be closer to the actual working mechanism of the washing system 2, the flash evaporation system 3 and the slag-water separation system 8, so that the change trend of the model data can be simulated in a precise manner.
It should be noted that, in this embodiment, only the control of the amount of the coal water slurry a and the amount of the oxygen b entering the gasification system 1 is taken as an example, the execution component further includes a plurality of other regulating valves, and corresponding regulating valves may be arranged at the pipeline, the outlet, and the inlet of the gasification system 1 according to the range that can be realized by the system model, which is not listed here.
Similarly, the sensor assembly further includes other detection devices, such as temperature and pressure detection devices, and corresponding detection devices (sensors) may be disposed at the pipeline, the outlet and the inlet of the gasification system 1 to detect the required data according to the range that can be realized by the system model, which is not listed here.
In an alternative of this embodiment, the DCS controller component includes a DCS controller, an instruction input device, and a result display device; the instruction input equipment and the result display equipment are both connected with the DCS controller; the instruction input equipment is used for inputting a threshold value of an operation amount and a threshold value of a controllable variable by an operator; the result display device is used for monitoring data by operators.
Optionally, the DCS controller component further includes a logic control circuit that employs a communication handshake logic, a controller switching logic, a loop switching logic, an out-of-limit logic, or a card limit alarm logic, and the logic control circuit is connected between the DCS controller and the optimization controller 604.
In an alternative of this embodiment, the method further includes the following steps:
the DCS controller component communicates with the OPC server 5 through a first communication means and the optimization controller 604 communicates with the OPC server 5 through a second communication means.
In this embodiment, an operator can set the controllable variables, the threshold values and the predetermined ideal values of the execution components on the dedicated operation interface of the DCS system 4, perform data monitoring, control device switching, variable and loop switching, and high and low limit setting, and send a cut-off or commissioning instruction to the optimization controller 604. After receiving the commissioning command, the control system 6 updates the real-time data of each controllable variable, and then performs further calculation and control work.
Optionally, the first communication device and the second communication device are network cards that communicate in a wired manner, so that the OPC server 5 can communicate with the DCS control system 6 and the optimization controller 604 respectively through ethernet.
Alternatively, the OPC server 5 is separately provided or reused after the engineer station or the operator station of the DCS system 4 activates the OPC service authorization.
In an alternative embodiment of the present invention, the control system 6 further includes a system configuration 606, and the system configuration 606 stores a file path and information required for the operation of the optimization controller 604, and a server address.
The system configuration 606 includes important information for controlling the system 6, including but not limited to various file paths, server addresses, configurations of input and output points, information about the operation of the optimizer controller 604, various control and optimization parameter configurations, etc.
Example II,
The second embodiment provides a coal water slurry gasification production system, the embodiment comprises the advanced process control system of the coal water slurry gasification device in the first embodiment, the technical characteristics of the advanced process control system of the coal water slurry gasification device disclosed in the first embodiment are also applicable to the embodiment, and the technical characteristics of the advanced process control system of the coal water slurry gasification device disclosed in the first embodiment are not described repeatedly.
Referring to fig. 1 to 3, the coal-water slurry gasification production system provided in this embodiment includes a coal-water slurry gasification apparatus as an advanced process control system of the coal-water slurry gasification apparatus in the first embodiment.
The advanced process control system of the coal water slurry gasification device comprehensively applies the technologies of OPC communication technology, model predictive control, soft measurement and the like through an advanced control system, and designs a control scheme based on a gasification process mechanism. The following effects can be achieved:
1. the automatic control of the coal water slurry gasification device is realized, such as the temperature regulation of the gasification furnace, the oxygen-coal ratio regulation, the automatic load lifting of the system, the automatic flushing and discharging of a slag-water system and the like, the automation level of the device is greatly improved, and the labor intensity of operators is reduced;
2. by realizing automatic control, the fluctuation range of key process parameters is reduced to 52.55 percent, and the stability and the safety of the device are improved;
3. the optimized control of the water gas component is realized, the effective gas content is improved by about 1 percent, and the yield of downstream products can be further improved;
4. the specific oxygen consumption, the specific coal consumption and the like are reduced, and the energy consumption of the system is reduced by 1.33 percent.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An advanced process control system of a coal water slurry gasification device is used for the coal water slurry gasification device and is characterized in that the coal water slurry gasification device comprises a feeding system, a gasification system, a washing system, a flash evaporation system and an execution component, wherein the execution component is arranged on the feeding system, the gasification system, the washing system and the flash evaporation system;
the advanced process control system of the coal water slurry gasification device comprises:
the DCS comprises a sensor assembly and a DCS controller assembly which are in communication connection;
the system comprises a control system, a prediction module and an optimization controller, wherein the control system comprises a real-time data memory, a system model memory, the prediction module and the optimization controller which are mutually communicated and connected; the system model memory stores feed system model data and gasification washing and flash evaporation system model data;
the real-time data storage and the optimization controller are in communication connection with the DCS controller component; the sensor assembly respectively acquires real-time data of controllable variables of the feeding system, the gasification system, the washing system and the flash evaporation system, and transmits and stores the real-time data to the real-time data storage, and historical data are stored in the real-time data storage;
the prediction module can predict the change trend of the controllable variable in a preset time according to the feeding system model data, the gasification washing and flashing system model data and the historical data;
the optimization controller can calculate an optimal operation amount for the execution assembly according to the change trend and a preset ideal value, and transmits the optimal operation amount to the DCS controller assembly;
and the DCS controller component adjusts the execution component according to the optimal operation amount so that the controllable variable works at the preset ideal value.
2. The advanced process control system of a coal-water slurry gasification apparatus according to claim 1, wherein the control system further comprises a feedback correction module;
the feedback correction module is respectively in communication connection with the real-time data storage, the system model storage, the prediction module and the optimization controller;
the feedback correction module is configured to modify the feed system model data and the gasification scrubbing and flashing system model data based on the real-time data and the trend.
3. The advanced process control system of a coal-water slurry gasification unit of claim 1, wherein the sensor assembly comprises a first sensor assembly and a second sensor assembly;
the first sensor assembly is capable of acquiring first real-time data of a first controllable variable of the feed system and transmitting and storing the first real-time data to the real-time data storage;
the second sensor assembly is capable of acquiring second real-time data of second controllable variables of the gasification system, the scrubbing system, and the flash system, and transmitting and storing the second real-time data to the real-time data storage.
4. The advanced process control system of a coal-water slurry gasification device according to claim 3, wherein the optimization controller comprises a feed controller and a gasification controller;
the execution components comprise a first execution component arranged on the feeding system and a second execution component arranged on the gasification system, the washing system and the flash evaporation system;
the prediction module can predict a first change trend of the first controllable variable in the preset time according to the first real-time data and the feeding system model data; the feeding controller can calculate a first optimal operation amount for the first executing component according to the first change trend and the preset ideal value;
the prediction module is further capable of predicting a second change trend of the second controllable variable within the preset time according to the second real-time data and the gasification washing and flashing system model data; the gasification controller is capable of calculating a second optimal operation amount for the second execution component based on the second trend of change and the predetermined ideal value.
5. The advanced process control system of a coal-water slurry gasification device according to claim 4, wherein the first execution component comprises at least a first valve arranged at an outlet of the feeding system;
the first sensor assembly includes at least a flow sensor disposed at an outlet of the feed system;
the feed system model data is control model data of a set quantity of the first actuator assembly to a detected quantity of the first sensor assembly.
6. The advanced process control system of a coal-water slurry gasification device according to claim 4, wherein the second execution component comprises at least a first black water flow regulating valve arranged between the gasification system and the flash evaporation system and a second black water flow regulating valve arranged between the washing system and the flash evaporation system;
the second sensor assembly at least comprises a liquid level sensor arranged on the gasification system, an oxygen content sensor arranged on an inlet of the gasification system, a carbon dioxide content detector and a methane content detector arranged on an outlet of the gasification system, and a temperature sensor arranged on an outlet of the washing system;
the gasification washing and flashing system model data is control model data of the set value of the second execution component to the detection quantity of the second sensor component.
7. The advanced process control system of a coal water slurry gasification device according to claim 1, wherein the DCS controller component comprises a DCS controller, an instruction input device and a result display device;
the instruction input equipment and the result display equipment are both connected with the DCS controller; the instruction input equipment is used for inputting the threshold value of the operation amount and the threshold value of the controllable variable by an operator;
and the result display equipment is used for monitoring data by operators.
8. The coal-water slurry gasification device advanced process control system according to any one of claims 1 to 7, further comprising a first communication device, a second communication device and an OPC server:
the DCS controller assembly is communicated with the OPC server through the first communication device, and the optimization controller is communicated with the OPC server through the second communication device.
9. The advanced process control system of a coal-water slurry gasification device according to any one of claims 1 to 7, further comprising a system configuration, wherein the system configuration stores file paths and information required for the operation of the optimization controller, and server addresses.
10. A coal water slurry gasification production system, characterized by comprising a coal water slurry gasification device and an advanced process control system of the coal water slurry gasification device according to any one of claims 1 to 9.
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