A flow pressure joint control system, device, method and computer storage medium for multiple cooling and reheating units

Abstract

The present invention relates to a flow pressure joint control system and method for multiple cold reheating units, wherein the system includes unit 1, unit 2, unit 3, a heating main pipe, a heating main pipe pressure setting module, a heating main pipe flow demand calculation module, a multi-unit actual power generation acquisition module, a multi-unit flow scheduling module, a limit speed module, a deviation calculation module and a PID control module. The present invention realizes the estimated calculation and real-time regulation of the flow demand of the heating main pipe through the joint operation of the flow regulation of two units and the pressure regulation of one unit, thereby performing real-time calculation of the economic performance of the flow regulation according to the current unit power load, realizing dynamic distribution of the heat load of the two heating units, thereby achieving the purpose of energy saving and emission reduction; on the other hand, a single pressure regulation can solve the pressure fluctuation problem caused by the flow regulation process and ensure the steam parameter quality of the steam-using enterprise. Thus, a better joint scheduling at the plant level is realized.

Description

Technical Field

[0001] The present invention relates to the field of energy distribution, and in particular to a flow rate and pressure joint control system and method for multiple cooling and reheating units. Background Art

[0002] With the rapid development of my country's economy, the demand for energy is becoming more and more vigorous, and energy shortage will seriously restrict the development of my country's economy. On the one hand, heating units need to meet the electricity needs of enterprises and residents, and on the other hand, they need to meet the steam needs of industrial production enterprises. Therefore, there is still a lot of room for energy-saving optimization and control of heating units.

[0003] In recent years, plant-level load dispatching has provided a new idea for energy-saving optimization of heating units. Thermal power plants bear the heat load demand of a certain area. With the application of thermal-electric decoupling technology, their heating methods are more flexible and diverse, and their operating boundaries and safety protection constraints are more numerous. A unified plant-level heating dispatching platform is urgently needed to carry out heat and electricity load dispatching, so as to improve the economic performance and safety performance of unit operation. In current engineering practice, in order to ensure the steam temperature and pressure requirements on the user side, the units mostly use pressure control, but due to the large inertia and large delay characteristics of the heating pipeline, the actual flow demand of the user and the steam flow on the plant side are not balanced in real time, and the flow difference is large; on the other hand, pressure control cannot achieve the regulation of the heating flow of a single unit, and the control is relatively extensive, and the plant-level heating cannot achieve the purpose of energy saving.

[0004] The unit heat supply adopts flow control. Due to the power plant network security requirements, the heat user demand data on the unit side cannot be transmitted to the DCS closed loop. As a result, in the actual operation of the heating unit, the heating supply of a single unit is often dispatched by telephone based on personnel experience. Although the heating supply can be adjusted, there are no specific economic evaluation indicators. As the power load changes, personnel adjustments cannot be optimized in real time. On the other hand, due to the limitations of data acquisition methods, the use of flow regulation will cause large fluctuations in the mother pipe pressure and unstable mother pipe steam parameters. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a flow and pressure joint control system and method for multiple cold reheating units, to ensure the stability of parameters such as the mother pipe pressure and the adjustable flow of different units, to achieve the energy conservation and emission reduction and closed-loop control goals of the plant-level heating units, and to improve the economic performance and automation level of the units.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a flow pressure joint control system for multiple cold reheating units, including unit 1, unit 2, unit 3, a heating main pipe, a heating main pipe pressure setting module, a heating main pipe flow demand calculation module, a multi-unit actual power generation acquisition module, a multi-unit flow scheduling module, a limit speed module, a deviation calculation module and a PID control module;

[0007] The No. 1 unit is connected to the heating main pipe through the No. 1 unit pipeline, the No. 2 unit is connected to the heating main pipe through the No. 2 unit pipeline, and the No. 3 unit is connected to the heating main pipe through the No. 3 unit pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the No. 1 unit pipeline, the No. 2 unit pipeline and the No. 3 unit pipeline are respectively provided with a No. 1 unit cold reheating flowmeter, a No. 2 unit cold reheating flowmeter and a No. 3 unit cold reheating flowmeter for detecting the output cold reheating flow of the corresponding units; the No. 1 unit pipeline, the No. 2 unit pipeline and the No. 3 unit pipeline are also correspondingly provided with a No. 1 unit cold reheating regulating valve, a No. 2 unit cold reheating regulating valve and a No. 3 unit cold reheating regulating valve;

[0008] The heating main pipe pressure setting module is used to set the pressure inside the heating main pipe;

[0009] The heating main pipe flow demand calculation module is used to calculate the total heating flow demand value of the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3;

[0010] The multi-unit actual power generation acquisition module is used to obtain the current power load of the three units, and is also used to obtain the thermal power load-coal consumption characteristic curves of the No. 1 unit and the No. 2 unit;

[0011] The multi-unit flow scheduling module is used to calculate the optimal heat load distribution of Unit 1 and Unit 2 based on the particle swarm optimization algorithm according to the total demand value of the heat flow of the heat supply main pipe, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of the three units.

[0012] The amplitude limiting and speed limiting module is used to adjust the cold re-extraction regulating valve of Unit 1 and the re-extraction regulating valve of Unit 2 according to the calculated optimal heat load distribution of Unit 1 and Unit 2, so as to complete the flow regulation control of the heating main pipe;

[0013] The deviation calculation module is used to calculate the pressure deviation value in the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection value of the heating main pipe pressure sensor;

[0014] The PID control module is used to perform PID adjustment on the pressure deviation value in the heating main pipe to obtain an opening adjustment parameter, and adjust the opening of the cold re-extraction steam regulating valve of Unit 3 according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

[0015] Based on the above-mentioned flow rate and pressure joint control system of multiple cooling and reheating units, the present invention also provides a flow rate and pressure joint control device of multiple cooling and reheating units.

[0016] A flow and pressure joint control device for multiple cold reheating units, comprising a controller, unit 1, unit 2 and unit 3, wherein the unit 1 is connected to a heating main pipe through a unit 1 pipeline, the unit 2 is connected to a heating main pipe through a unit 2 pipeline, and the unit 3 is connected to a heating main pipe through a unit 3 pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the unit 1 pipeline, the unit 2 pipeline and the unit 3 pipeline are respectively provided with a unit 1 cold reheating flow meter, a unit 2 cold reheating flow meter and a unit 3 cold reheating flow meter for detecting the cold reheating flow output by the corresponding units; the unit 1 pipeline, the unit 2 pipeline and the unit 3 pipeline are also respectively provided with a unit 1 cold reheating regulating valve, a unit 2 cold reheating regulating valve and a unit 3 cold reheating regulating valve;

[0017] The heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3 are connected to the input end of the controller, and the output end of the controller is respectively connected to the cold re-extraction regulating valve of unit 1, the cold re-extraction regulating valve of unit 2 and the cold re-extraction regulating valve of unit 3;

[0018] The controller is used to set the pressure in the heating main pipe; calculate the total demand value of the heating flow of the heating main pipe according to the set value of the pressure in the heating main pipe and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of the unit 1, the cold reheating flow meter of the unit 2 and the cold reheating flow meter of the unit 3; obtain the current power load of the three units, and obtain the thermal power load-coal consumption characteristic curves of the units 1 and 2; based on the particle swarm optimization algorithm, calculate the total demand value of the heating flow of the heating main pipe, the thermal power load-coal consumption characteristic curves of the units 1 and 2 and the current power load of the three units Optimal heat load distribution for Unit 1 and Unit 2; adjusting the cold re-extraction regulating valve of Unit 1 and the re-extraction regulating valve of Unit 2 according to the calculated optimal heat load distribution for Unit 1 and Unit 2 to complete the flow regulation control of the heating main pipe; calculating the pressure deviation value in the heating main pipe according to the set value of the pressure in the heating main pipe and the detection value of the pressure sensor of the heating main pipe; performing PID regulation on the pressure deviation value in the heating main pipe to obtain the opening regulation parameter, and adjusting the opening of the cold re-extraction regulating valve of Unit 3 according to the opening regulation parameter to complete the pressure regulation control of the heating main pipe.

[0019] Based on the above-mentioned flow rate and pressure joint control system of multiple cooling and reheating units, the present invention also provides a flow rate and pressure joint control method of multiple cooling and reheating units.

[0020] A method for jointly controlling the flow and pressure of multiple cooling and reheating units, using the above-mentioned multiple cooling and reheating unit flow and pressure joint control system to jointly control the flow and pressure of multiple units; wherein the multiple units include unit 1, unit 2 and unit 3, the unit 1 is connected to the heating main pipe through the unit 1 pipeline, the unit 2 is connected to the heating main pipe through the unit 2 pipeline, and the unit 3 is connected to the heating main pipe through the unit 3 pipeline; the heating main pipe is equipped with a heating main pipe pressure sensor for detecting the pressure in the heating main pipe. sensor; the pipeline of unit 1, the pipeline of unit 2 and the pipeline of unit 3 are respectively provided with a cold reheating flowmeter of unit 1, a cold reheating flowmeter of unit 2 and a cold reheating flowmeter of unit 3 for detecting the cold reheating flow output by the corresponding units; the pipeline of unit 1, the pipeline of unit 2 and the pipeline of unit 3 are also respectively provided with a cold re-extraction regulating valve of unit 1, a cold re-extraction regulating valve of unit 2 and a cold re-extraction regulating valve of unit 3; the flow pressure joint control method of multiple cold reheating units comprises the following steps,

[0021] Setting the pressure in the heating main pipe;

[0022] Calculate the total demand value of the heating flow of the heating main pipe according to the set value of the pressure in the heating main pipe and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3;

[0023] Obtain the current electrical loads of the three units, and obtain the thermal power load-coal consumption characteristic curves of the No. 1 unit and the No. 2 unit;

[0024] Based on the particle swarm optimization algorithm, the optimal heat load distribution of Unit 1 and Unit 2 is calculated according to the total demand value of the heat flow of the heat supply main pipe, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of the three units.

[0025] According to the calculated optimal heat load distribution of the No. 1 unit and the No. 2 unit, the cold re-extraction regulating valve of the No. 1 unit and the re-extraction regulating valve of the No. 2 unit are adjusted to complete the flow regulation control of the heating main pipe;

[0026] Calculating the pressure deviation value in the heating main pipe according to the set value of the pressure in the heating main pipe and the detection value of the heating main pipe pressure sensor;

[0027] The pressure deviation value in the heating main pipe is PID regulated to obtain an opening adjustment parameter, and the opening of the cold re-extraction steam regulating valve of Unit 3 is adjusted according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

[0028] Based on the above-mentioned method for jointly controlling flow and pressure of multiple cooling and reheating units, the present invention also provides a computer storage medium.

[0029] A computer storage medium comprises a memory and a computer program stored in the memory. When the computer program is executed by a processor, the flow rate and pressure joint control method of multiple cooling and reheating units as described above is implemented.

[0030] The beneficial effects of the present invention are as follows: in the present invention, a flow pressure joint control system and method for multiple cold reheating units realizes the estimated calculation and real-time adjustment of the heating main pipe flow demand through the joint operation of the flow regulation of two units and the pressure regulation of one unit, so as to perform real-time calculation of the economic performance of flow regulation according to the current unit power load, realize the dynamic allocation of heat load of two heating units, and achieve the purpose of energy saving and emission reduction; on the other hand, the pressure regulation of a single unit can solve the pressure fluctuation problem caused by the flow regulation process, and ensure the steam parameter quality of the steam-using enterprise. Thus, a better joint dispatch at the plant level is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a structural schematic diagram of a flow rate and pressure joint control system of multiple cooling and reheating units of the present invention;

[0032] Figure 2 This is the flow chart of the particle swarm optimization algorithm;

[0033] Figure 3 The present invention is a flow chart of a method for jointly controlling flow and pressure of multiple cooling and reheating units. DETAILED DESCRIPTION

[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0035] like Figure 1 As shown, a flow pressure joint control system for multiple cooling and reheating units includes unit 1, unit 2, unit 3, a heating main pipe, a heating main pipe pressure setting module, a heating main pipe flow demand calculation module, a multi-unit actual power generation acquisition module, a multi-unit flow scheduling module, a limit speed module, a deviation calculation module and a PID control module;

[0036] The No. 1 unit is connected to the heating main pipe through the No. 1 unit pipeline, the No. 2 unit is connected to the heating main pipe through the No. 2 unit pipeline, and the No. 3 unit is connected to the heating main pipe through the No. 3 unit pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the No. 1 unit pipeline, the No. 2 unit pipeline and the No. 3 unit pipeline are respectively provided with a No. 1 unit cold reheating flowmeter, a No. 2 unit cold reheating flowmeter and a No. 3 unit cold reheating flowmeter for detecting the output cold reheating flow of the corresponding units; the No. 1 unit pipeline, the No. 2 unit pipeline and the No. 3 unit pipeline are also correspondingly provided with a No. 1 unit cold reheating regulating valve, a No. 2 unit cold reheating regulating valve and a No. 3 unit cold reheating regulating valve;

[0037] The heating main pipe pressure setting module is used to set the pressure inside the heating main pipe;

[0038] The heating main pipe flow demand calculation module is used to calculate the total heating flow demand value of the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3;

[0039] The multi-unit actual power generation acquisition module is used to obtain the current power load of the three units, and is also used to obtain the thermal power load-coal consumption characteristic curves of the No. 1 unit and the No. 2 unit;

[0040] The multi-unit flow scheduling module is used to calculate the optimal heat load distribution of Unit 1 and Unit 2 based on the particle swarm optimization algorithm according to the total demand value of the heat flow of the heat supply main pipe, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of the three units.

[0041] The amplitude limiting and speed limiting module is used to adjust the cold re-extraction regulating valve of Unit 1 and the re-extraction regulating valve of Unit 2 according to the calculated optimal heat load distribution of Unit 1 and Unit 2, so as to complete the flow regulation control of the heating main pipe;

[0042] The deviation calculation module is used to calculate the pressure deviation value in the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection value of the heating main pipe pressure sensor;

[0043] The PID control module is used to perform PID adjustment on the pressure deviation value in the heating main pipe to obtain an opening adjustment parameter, and adjust the opening of the cold re-extraction steam regulating valve of Unit 3 according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

[0044] In this specific embodiment:

[0045] The heating main pipe flow demand calculation module is specifically used to calculate the pressure deviation value in the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection value of the heating main pipe pressure sensor; calculate the total heating flow demand value of the heating main pipe according to the pressure deviation value in the heating main pipe and the detection values ​​of the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3.

[0046] The multi-unit flow scheduling module is specifically used to reserve a preset cold reheating flow from the output of Unit 3 according to the current power load of Unit 3; calculate the total demand value of the heating flow of Unit 1 and Unit 2 according to the total demand value of the heating flow of the heating mother pipe and the preset cold reheating flow reserved in the output of Unit 3; calculate the optimal heat load distribution of Unit 1 and Unit 2 by particle swarm optimization algorithm according to the total demand value of the heating flow of Unit 1 and Unit 2, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2 and the current power load of Unit 1 and Unit 2.

[0047] The pipeline of unit 1, the pipeline of unit 2 and the pipeline of unit 3 are also provided with a No. 1 cold re-extraction steam check valve, a No. 2 cold re-extraction steam check valve and a No. 3 cold re-extraction steam check valve for preventing backflow.

[0048] It also includes a data reading module, which is used to collect the set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3, and transmit the collected set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3 to the heating main pipe flow demand calculation module.

[0049] The limiting and speed limiting module is specifically used to convert the optimal heat load distribution of Unit 1 and Unit 2 calculated by the multi-unit flow scheduling module into limiting and speed limiting signals, and adjust the cold re-extraction steam regulating valve of Unit 1 and the re-extraction steam regulating valve of Unit 2 according to the limiting and speed limiting signals to complete the flow regulation control of the heating main pipe.

[0050] In a flow pressure joint control system for multiple cold reheating units of the present invention: part of the steam discharged from the high-pressure cylinder of unit 1 flows through the cold reheating check valve No. 1, and the flow rate is regulated and controlled by the cold reheating regulating valve of unit 1; part of the steam discharged from the high-pressure cylinder of unit 2 flows through the cold reheating check valve No. 2, and the flow rate is regulated and controlled by the cold reheating regulating valve of unit 2; part of the steam discharged from the high-pressure cylinder of unit 3 flows through the cold reheating check valve No. 3, and the flow rate is regulated and controlled by the cold reheating regulating valve of unit 3. The mother pipe pressure is regulated and controlled; the data reading module obtains the cold reheating flow of each unit measured by the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2, and the cold reheating flow meter of unit 3, the pressure in the heating mother pipe measured by the heating mother pipe pressure sensor, and the mother pipe pressure setting value input by the pressure setting value in the heating mother pipe; after the mother pipe flow demand calculation module calculates, the mother pipe heating flow demand value can be obtained by calculating the pressure deviation and the current cold reheating flow of each unit. Then, the appropriate cold reheating flow of unit 3 is reserved according to the current electrical load of unit 3, so as to obtain the total heating flow demand of unit 1 and unit 2; thus, through the multi-unit flow scheduling module, according to the unit's thermal power load-coal consumption characteristic curve and the current electrical load, the optimal heat load distribution of unit 1 and unit 2 is calculated by the particle swarm optimization algorithm, so as to complete the flow control of the cold reheating control valve of unit 1 and the cold reheating control valve of unit 2. The reserved cold reflow rate of Unit 3 can ensure that the heating flow rate of Unit 3 can be adjusted up and down. The pressure deviation is adjusted through PID to adjust the opening of the cold re-extraction steam regulating valve of Unit 3 to ensure that the main pipe pressure is maintained in the appropriate operating range.

[0051] (1) Calculation formula for optimal heat load distribution between Unit 1 and Unit 2:

[0052] The energy-saving and economical distribution of heating load between the two units means that, combined with the current electrical load of the two units, the total fuel consumption of the two units under the total heat load is minimized by changing the heating distribution of the units. The objective function of this problem can be expressed as follows:

[0053]

[0054] Among them, F total is the total fuel consumption of Unit 1 and Unit 2, F j is the fuel consumption of unit j, f j (·) is the thermal power load-coal consumption characteristic curve of unit j, P j is the current electrical load of unit j (specifically, the current actual power generated); Q j is the current heat load of unit j, j=1,2.

[0055] The thermal load-coal consumption characteristics of the unit in the above formula refer to the quantitative relationship between the fuel consumption rate of the unit and its influencing factors, which can be expressed by a functional relationship or other mapping relationships. For the unit, considering the main factors affecting the performance of the unit, the energy consumption characteristics of the unit are attributed to the influence of the unit's power generation coal consumption and parameters such as power load and thermal load.

[0056] (2) Particle Swarm Optimization Algorithm:

[0057] Assuming that the search is conducted in an N-dimensional space, the information of particle i can be represented by two N-dimensional vectors: the position of the i-th particle can be represented as x i =(x i1 ,x i2 ,...,x iN ) T , the speed is v i =(v i1 ,v i2 ,...,v iN ) T , after finding two optimal solutions, the particle can update its speed and position according to the following formula:

[0058]

[0059]

[0060] Where: is the velocity of particle i in the dth dimension in the kth iteration; is the current position of particle i in the dth dimension in the kth iteration; i = 1, 2, 3, ..., M, M is the population size; c1 and c2 are learning factors respectively; and are random numbers between [0,1]; is the position of the individual extreme point of particle i in the dth dimension; is the position of the global extreme point of the entire population in the dth dimension; the calculation process of the particle swarm algorithm is as follows Figure 2 shown.

[0061] The present invention realizes the estimated calculation of the flow demand of the heating main pipe through the joint operation of flow regulation and pressure regulation of multiple heating units, so as to realize the real-time calculation of the economic performance through flow regulation, and realize the dynamic distribution of heat load of different heating units according to the current power load of the units, so as to achieve the purpose of energy saving and emission reduction; on the other hand, pressure regulation can solve the problem of pressure fluctuation caused by the flow regulation process and ensure the steam parameter quality of steam-using enterprises.

[0062] Based on the above-mentioned flow rate and pressure joint control system of multiple cooling and reheating units, the present invention also provides a flow rate and pressure joint control device of multiple cooling and reheating units.

[0063] A flow and pressure joint control device for multiple cold reheating units, comprising a controller, unit 1, unit 2 and unit 3, wherein the unit 1 is connected to a heating main pipe through a unit 1 pipeline, the unit 2 is connected to a heating main pipe through a unit 2 pipeline, and the unit 3 is connected to a heating main pipe through a unit 3 pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the unit 1 pipeline, the unit 2 pipeline and the unit 3 pipeline are respectively provided with a unit 1 cold reheating flow meter, a unit 2 cold reheating flow meter and a unit 3 cold reheating flow meter for detecting the cold reheating flow output by the corresponding units; the unit 1 pipeline, the unit 2 pipeline and the unit 3 pipeline are also respectively provided with a unit 1 cold reheating regulating valve, a unit 2 cold reheating regulating valve and a unit 3 cold reheating regulating valve;

[0064] The heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3 are connected to the input end of the controller, and the output end of the controller is respectively connected to the cold re-extraction regulating valve of unit 1, the cold re-extraction regulating valve of unit 2 and the cold re-extraction regulating valve of unit 3;

[0065] The controller is used to set the pressure in the heating main pipe; calculate the total demand value of the heating flow of the heating main pipe according to the set value of the pressure in the heating main pipe and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of the unit 1, the cold reheating flow meter of the unit 2 and the cold reheating flow meter of the unit 3; obtain the current power load of the three units, and obtain the thermal power load-coal consumption characteristic curves of the units 1 and 2; based on the particle swarm optimization algorithm, calculate the total demand value of the heating flow of the heating main pipe, the thermal power load-coal consumption characteristic curves of the units 1 and 2 and the current power load of the three units Optimal heat load distribution for Unit 1 and Unit 2; adjusting the cold re-extraction regulating valve of Unit 1 and the re-extraction regulating valve of Unit 2 according to the calculated optimal heat load distribution for Unit 1 and Unit 2 to complete the flow regulation control of the heating main pipe; calculating the pressure deviation value in the heating main pipe according to the set value of the pressure in the heating main pipe and the detection value of the pressure sensor of the heating main pipe; performing PID regulation on the pressure deviation value in the heating main pipe to obtain the opening regulation parameter, and adjusting the opening of the cold re-extraction regulating valve of Unit 3 according to the opening regulation parameter to complete the pressure regulation control of the heating main pipe.

[0066] Based on the above-mentioned flow rate and pressure joint control system of multiple cooling and reheating units, the present invention also provides a flow rate and pressure joint control method of multiple cooling and reheating units.

[0067] like Figure 3 As shown, a method for jointly controlling the flow and pressure of multiple cold reheating units is used, and the flow and pressure joint control system of multiple cold reheating units as described above is used to jointly control the flow and pressure of multiple units; wherein the multiple units include unit 1, unit 2 and unit 3, the unit 1 is connected to the heating main pipe through the unit 1 pipeline, the unit 2 is connected to the heating main pipe through the unit 2 pipeline, and the unit 3 is connected to the heating main pipe through the unit 3 pipeline; the heating main pipe is equipped with a heating main pipe pressure gauge for detecting the pressure in the heating main pipe. force sensor; the pipeline of unit 1, the pipeline of unit 2 and the pipeline of unit 3 are respectively provided with a cold reheating flowmeter of unit 1, a cold reheating flowmeter of unit 2 and a cold reheating flowmeter of unit 3 for detecting the cold reheating flow output by the corresponding units; the pipeline of unit 1, the pipeline of unit 2 and the pipeline of unit 3 are also respectively provided with a cold re-extraction regulating valve of unit 1, a cold re-extraction regulating valve of unit 2 and a cold re-extraction regulating valve of unit 3; the flow pressure joint control method of multiple cold reheating units comprises the following steps,

[0068] Setting the pressure in the heating main pipe;

[0069] Calculate the total demand value of the heating flow of the heating main pipe according to the set value of the pressure in the heating main pipe and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3;

[0070] Obtain the current electrical loads of the three units, and obtain the thermal power load-coal consumption characteristic curves of the No. 1 unit and the No. 2 unit;

[0071] Based on the particle swarm optimization algorithm, the optimal heat load distribution of Unit 1 and Unit 2 is calculated according to the total demand value of the heat flow of the heat supply main pipe, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of the three units.

[0072] According to the calculated optimal heat load distribution of the No. 1 unit and the No. 2 unit, the cold re-extraction regulating valve of the No. 1 unit and the re-extraction regulating valve of the No. 2 unit are adjusted to complete the flow regulation control of the heating main pipe;

[0073] Calculating the pressure deviation value in the heating main pipe according to the set value of the pressure in the heating main pipe and the detection value of the heating main pipe pressure sensor;

[0074] The pressure deviation value in the heating main pipe is PID regulated to obtain an opening adjustment parameter, and the opening of the cold re-extraction steam regulating valve of Unit 3 is adjusted according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

[0075] Based on the above-mentioned method for jointly controlling flow and pressure of multiple cooling and reheating units, the present invention also provides a computer storage medium.

[0076] A computer storage medium comprises a memory and a computer program stored in the memory. When the computer program is executed by a processor, the flow rate and pressure joint control method of multiple cooling and reheating units as described above is implemented.

[0077] In the present invention, a flow pressure joint control system and method for multiple cold reheating units realizes the estimated calculation and real-time adjustment of the heating main pipe flow demand through the joint operation of the flow regulation of two units and the pressure regulation of one unit, so as to realize the real-time calculation of the economic performance of the flow regulation according to the current unit power load, realize the dynamic distribution of the heat load of the two heating units, and achieve the purpose of energy saving and emission reduction; on the other hand, the pressure regulation of a single unit can solve the pressure fluctuation problem caused by the flow regulation process, and ensure the steam parameter quality of the steam-using enterprise. Thus, the better joint dispatch at the plant level is realized.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow and pressure joint control system for multiple cooling and reheating units, characterized in that: It includes Unit 1, Unit 2, Unit 3, heating main pipe, heating main pipe pressure setting module, heating main pipe flow demand calculation module, multi-unit actual power generation acquisition module, multi-unit flow scheduling module, amplitude limit and speed limit module, deviation calculation module and PID control module; The No. 1 unit is connected to the heating main pipe through the No. 1 unit pipeline, the No. 2 unit is connected to the heating main pipe through the No. 2 unit pipeline, and the No. 3 unit is connected to the heating main pipe through the No. 3 unit pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the No. 1 unit pipeline, the No. 2 unit pipeline and the No. 3 unit pipeline are respectively provided with a No. 1 unit cold reheating flowmeter, a No. 2 unit cold reheating flowmeter and a No. 3 unit cold reheating flowmeter for detecting the output cold reheating flow of the corresponding units; the No. 1 unit pipeline, the No. 2 unit pipeline and the No. 3 unit pipeline are also correspondingly provided with a No. 1 unit cold reheating regulating valve, a No. 2 unit cold reheating regulating valve and a No. 3 unit cold reheating regulating valve; The heating main pipe pressure setting module is used to set the pressure inside the heating main pipe; The heating main pipe flow demand calculation module is used to calculate the total heating flow demand value of the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3; The multi-unit actual power generation acquisition module is used to obtain the current power load of the three units, and is also used to obtain the thermal power load-coal consumption characteristic curves of the No. 1 unit and the No. 2 unit; The multi-unit flow scheduling module is used to calculate the optimal heat load distribution of Unit 1 and Unit 2 based on the particle swarm optimization algorithm according to the total demand value of the heat flow of the heat supply main pipe, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of the three units. The amplitude limiting and speed limiting module is used to adjust the cold re-extraction steam regulating valve of Unit 1 and the cold re-extraction steam regulating valve of Unit 2 according to the calculated optimal heat load distribution of Unit 1 and Unit 2, so as to complete the flow regulation control of the heating main pipe; The deviation calculation module is used to calculate the pressure deviation value in the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection value of the heating main pipe pressure sensor; The PID control module is used to perform PID adjustment on the pressure deviation value in the heating main pipe to obtain an opening adjustment parameter, and adjust the opening of the cold re-extraction steam regulating valve of Unit 3 according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

2. The flow and pressure joint control system for multiple cooling and reheating units according to claim 1 is characterized in that: The heating main pipe flow demand calculation module is specifically used for: Calculate the pressure deviation value in the heating main pipe according to the set value of the heating main pipe pressure setting module and the detection value of the heating main pipe pressure sensor; The total demand value of the heating flow of the heating main pipe is calculated based on the pressure deviation value in the heating main pipe and the detection values ​​of the cold reheating flow meter of Unit 1, the cold reheating flow meter of Unit 2 and the cold reheating flow meter of Unit 3.

3. The flow and pressure joint control system for multiple cooling and reheating units according to claim 1 is characterized in that: The multi-unit flow scheduling module is specifically used for: According to the current electrical load of the unit 3, a preset cold reheat flow rate is reserved from the output of the unit 3; Calculate the total demand value of the heating flow of the unit 1 and the unit 2 according to the total demand value of the heating flow of the heating main pipe and the preset cold reheating flow reserved in the output of the unit 3; According to the total demand value of the heat flow of Unit 1 and Unit 2, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of Unit 1 and Unit 2, the optimal heat load distribution of Unit 1 and Unit 2 is calculated by a particle swarm optimization algorithm.

4. The flow and pressure joint control system for multiple cooling and reheating units according to claim 1 is characterized in that: The optimal heat load distribution calculation formula for the No. 1 unit and the No. 2 unit is: Among them, F total is the total fuel consumption of Unit 1 and Unit 2, F j is the fuel consumption of unit j, f j (·) is the thermal power load-coal consumption characteristic curve of unit j, P j is the current electrical load of unit j; Q j is the current heat load of unit j, j=1,2.

5. The flow rate and pressure joint control system of multiple cooling and reheating units according to any one of claims 1 to 4, characterized in that: The pipeline of unit 1, the pipeline of unit 2 and the pipeline of unit 3 are also provided with a No. 1 cold re-extraction steam check valve, a No. 2 cold re-extraction steam check valve and a No. 3 cold re-extraction steam check valve for preventing backflow.

6. The flow rate and pressure joint control system of multiple cooling and reheating units according to any one of claims 1 to 4, characterized in that: It also includes a data reading module, which is used to collect the set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3, and transmit the collected set value of the heating main pipe pressure setting module and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3 to the heating main pipe flow demand calculation module.

7. The flow rate and pressure joint control system of multiple cooling and reheating units according to any one of claims 1 to 4, characterized in that: The limiting and speed limiting module is specifically used to convert the optimal heat load distribution of Unit 1 and Unit 2 calculated by the multi-unit flow scheduling module into limiting and speed limiting signals, and adjust the cold re-extraction steam regulating valve of Unit 1 and the cold re-extraction steam regulating valve of Unit 2 according to the limiting and speed limiting signals to complete the flow regulation control of the heating main pipe.

8. A flow and pressure joint control device for multiple cooling and reheating units, characterized in that: It includes a controller, unit 1, unit 2 and unit 3, wherein the unit 1 is connected to the heating main pipe through the unit 1 pipeline, the unit 2 is connected to the heating main pipe through the unit 2 pipeline, and the unit 3 is connected to the heating main pipe through the unit 3 pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the unit 1 pipeline, the unit 2 pipeline and the unit 3 pipeline are respectively provided with a unit 1 cold reheating flowmeter, a unit 2 cold reheating flowmeter and a unit 3 cold reheating flowmeter for detecting the cold reheating flow output by the corresponding units; the unit 1 pipeline, the unit 2 pipeline and the unit 3 pipeline are also correspondingly provided with a unit 1 cold re-extraction regulating valve, a unit 2 cold re-extraction regulating valve and a unit 3 cold re-extraction regulating valve; The heating main pipe pressure sensor, the cold reheating flowmeter of unit 1, the cold reheating flowmeter of unit 2 and the cold reheating flowmeter of unit 3 are connected to the input end of the controller, and the output end of the controller is respectively connected to the cold re-extraction regulating valve of unit 1, the cold re-extraction regulating valve of unit 2 and the cold re-extraction regulating valve of unit 3; The controller is used to set the pressure in the heating main pipe; calculate the total demand value of the heating flow of the heating main pipe according to the set value of the pressure in the heating main pipe and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3; obtain the current power load of the three units, and obtain the thermal power load-coal consumption characteristic curves of unit 1 and unit 2; based on the particle swarm optimization algorithm, calculate the total demand value of the heating flow of the heating main pipe, the thermal power load-coal consumption characteristic curves of unit 1 and unit 2 and the current power load of the three units. The optimal heat load distribution of Unit 1 and Unit 2 is calculated, and the cold re-extraction steam regulating valve of Unit 1 and the cold re-extraction steam regulating valve of Unit 2 are adjusted according to the calculated optimal heat load distribution of Unit 1 and Unit 2 to complete the flow regulation control of the heating main pipe; the pressure deviation value in the heating main pipe is calculated according to the set value of the pressure in the heating main pipe and the detection value of the pressure sensor of the heating main pipe; PID adjustment is performed on the pressure deviation value in the heating main pipe to obtain the opening adjustment parameter, and the opening of the cold re-extraction steam regulating valve of Unit 3 is adjusted according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

9. A method for joint control of flow and pressure of multiple cooling and reheating units, characterized in that: The flow rate and pressure joint control system of multiple cold reheating units as claimed in any one of claims 1 to 7 is applied to jointly control the flow rate and pressure of multiple units; wherein the multiple units include unit 1, unit 2 and unit 3, the unit 1 is connected to the heating main pipe through the unit 1 pipeline, the unit 2 is connected to the heating main pipe through the unit 2 pipeline, and the unit 3 is connected to the heating main pipe through the unit 3 pipeline; a heating main pipe pressure sensor for detecting the pressure in the heating main pipe is installed on the heating main pipe; the 1 The pipeline of the unit 1, the pipeline of the unit 2 and the pipeline of the unit 3 are respectively provided with a cold reheating flowmeter of the unit 1, a cold reheating flowmeter of the unit 2 and a cold reheating flowmeter of the unit 3 for detecting the cold reheating flow output by the corresponding units; the pipeline of the unit 1, the pipeline of the unit 2 and the pipeline of the unit 3 are also respectively provided with a cold re-extraction regulating valve of the unit 1, a cold re-extraction regulating valve of the unit 2 and a cold re-extraction regulating valve of the unit 3; the flow and pressure joint control method of multiple cold reheating units includes the following steps, Setting the pressure in the heating main pipe; Calculate the total demand value of the heating flow of the heating main pipe according to the set value of the pressure in the heating main pipe and the detection values ​​of the heating main pipe pressure sensor, the cold reheating flow meter of unit 1, the cold reheating flow meter of unit 2 and the cold reheating flow meter of unit 3; Obtain the current electrical loads of the three units, and obtain the thermal power load-coal consumption characteristic curves of the No. 1 unit and the No. 2 unit; Based on the particle swarm optimization algorithm, the optimal heat load distribution of Unit 1 and Unit 2 is calculated according to the total demand value of the heat flow of the heat supply main pipe, the thermal power load-coal consumption characteristic curves of Unit 1 and Unit 2, and the current power load of the three units. According to the calculated optimal heat load distribution of the unit 1 and the unit 2, the cold re-extraction steam regulating valve of the unit 1 and the cold re-extraction steam regulating valve of the unit 2 are adjusted to complete the flow regulation control of the heat supply mother pipe; Calculating the pressure deviation value in the heating main pipe according to the set value of the pressure in the heating main pipe and the detection value of the heating main pipe pressure sensor; The pressure deviation value in the heating main pipe is PID regulated to obtain an opening adjustment parameter, and the opening of the cold re-extraction steam regulating valve of Unit 3 is adjusted according to the opening adjustment parameter to complete the pressure regulation control of the heating main pipe.

10. A computer storage medium, characterized in that: It comprises a memory and a computer program stored in the memory. When the computer program is executed by a processor, the flow rate and pressure joint control method of multiple cooling and reheating units as claimed in claim 9 is implemented.

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