Operation control method and device of water condensation system, storage medium and electronic equipment

Abstract

The invention relates to an operation control method and device of a condensate water system, a storage medium and electronic equipment, and relates to the technical field of steam turbines, the operation control method and device are used for the condensate water system, the condensate water system comprises a main machine, a condensate water pump, a regulating valve and a condenser, and the operation control method of the condensate water system comprises the steps that operation parameters of the main machine are obtained; controlling the rotating speed of the condensate pump according to the operating parameters of the host; and under the condition that the operation parameters of the main machine reach the first threshold value, the condensate pump is controlled to operate at the first rotating speed, and the opening degree of the adjusting valve is adjusted to control the water level of the condenser. The rotating speed of the condensate pump is controlled through the operation parameters of the main machine, control over the condenser and the condensate pump is decoupled, especially when the S ratio is low, the water level of the condenser can be effectively controlled, and the problem that the system is unstable due to the fact that the pressure difference of an adjusting valve is too small is solved. When operation parameters of the main machine change, the rotating speed of the condensate pump and the opening degree of the adjusting valve are adjusted in time, the stable state of the condensate system can be maintained, and the reliability and efficiency of the condensate system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and in particular to an operation control method, device, storage medium and electronic equipment for a condensate system. Background Art

[0002] The condensate system uses a turbine condensate pump to transport the condensate in the condenser to the deaerator, and maintains the water level balance of the main condenser under different main engine operating conditions. The condensate system consists of a turbine condensate pump and a condensate throttling regulating valve and other equipment. The main engine includes a steam turbine. The condenser is located at the end of the steam turbine and is responsible for condensing the steam discharged from the steam turbine into water, recycling water resources, creating a low-pressure environment for the steam turbine, and improving the efficiency of the steam turbine power generation system.

[0003] The automatic control logic of the condensate system is: when the main engine operating conditions change, the condenser water level changes instantaneously, and the condensate throttling regulating valve is used to control the condenser water level. The pressure difference of the main condensate throttling regulating valve controls the speed of the steam turbine condensate pump. The speed of the steam turbine condensate pump is automatically adjusted to keep the pressure difference of the throttling regulating valve unchanged, and the condenser water level remains stable. Coupling the condensate pump speed control and the condenser water level control together still has certain disadvantages.

[0004] The above control logic has the best regulation function when the S ratio (the ratio of the pressure difference of the condensate throttling control valve to the resistance of the condensate system is called the S ratio) is between 0.3 and 0.5. However, when the S ratio is relatively small, even if the opening of the control valve changes greatly, the flow rate through the valve will not change significantly. At this time, when the working conditions change greatly, the valve position of the control valve will fluctuate greatly. In order to maintain the constant pressure difference of the control valve, the speed of the condensate pump will also oscillate with the valve position of the control valve, causing the condensate system to be unstable and the condenser water level to fluctuate violently, and it is impossible to achieve a good water level control effect. That is, due to the small change in the pressure difference of the control valve, in order to maintain the stability of the water level, the control valve needs to adjust the opening frequently and greatly. This frequent change in valve position will cause large fluctuations in the valve position of the control valve. When the valve position of the control valve fluctuates frequently, the speed of the condensate pump will also change frequently, resulting in speed oscillation, which will affect the stability of the system.

[0005] Therefore, how to propose an operation control scheme for the condensate system to achieve good condenser liquid level control when S is relatively low and ensure the operation stability of the condensate system has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of this, the present invention aims to solve the problem that when the condensation system has a low S ratio, the condenser water level fluctuates violently, a good water level control effect cannot be achieved, and the stability of the system is affected.

[0007] Specifically, the present invention is achieved through the following technical solutions:

[0008] According to a first aspect of the present invention, a method for controlling an operation of a condensation system is provided, which is used for the condensation system. The condensation system includes a main unit, a condensation pump, a regulating valve and a condenser. The method for controlling the operation of the condensation system includes: obtaining operating parameters of the main unit; controlling the rotation speed of the condensation pump according to the operating parameters of the main unit; when the operating parameters of the main unit reach a first threshold, controlling the condensation pump to operate at a first rotation speed, and adjusting the opening of the regulating valve to control the water level of the condenser.

[0009] Optionally, in some technical solutions, the step of controlling the rotation speed of the condensate pump according to the operating parameters of the host includes: obtaining a performance curve of the condensate pump; and establishing a relationship between the operating parameters of the host and the rotation speed of the condensate pump according to the performance curve.

[0010] Optionally, in some technical schemes, the steps of establishing the relationship between the operating parameters of the main engine and the speed of the condensate pump include: determining the initial speed of the condensate pump; at the initial speed of the condensate pump, measuring the inlet pressure and outlet pressure of the regulating valve to obtain the measured pressure difference of the regulating valve; gradually adjusting the speed of the condensate pump until the measured pressure difference of the regulating valve is consistent with the rated operating condition of the main engine; when the measured pressure difference of the regulating valve is consistent with the rated operating condition of the main engine, recording the operating parameters of the main engine and the speed of the condensate pump.

[0011] Optionally, in some technical schemes, the step of determining the initial speed of the condensate pump includes: obtaining the system resistance and condensate flow of the condensate system; determining the initial speed of the condensate pump according to the system resistance, condensate flow and performance curve; wherein the system resistance includes the resistance of the regulating valve and the resistance of the pipeline.

[0012] Optionally, in some technical schemes, the step of determining the initial speed of the condensate pump according to the system resistance, condensate flow rate and the performance curve includes: obtaining the S ratio, which is the ratio of the pressure difference of the regulating valve to the system resistance; determining the theoretical pressure difference of the regulating valve according to the system resistance and the S ratio; and finding the corresponding initial speed of the condensate pump on the performance curve according to the theoretical pressure difference of the regulating valve, the condensate flow rate and the system resistance.

[0013] Optionally, in some technical solutions, the condensate system further includes a water replenishment pump, which replenishes water into the condensate system to maintain a stable pressure in the condensate system.

[0014] Optionally, in some technical solutions, the main engine is a steam turbine generator, and the operating parameters of the main engine include load parameters and steam parameters.

[0015] According to a second aspect of the present invention, a condensation system operation control device is provided, which is used for the condensation system. The condensation system includes a main unit, a condensation pump, a regulating valve and a condenser. The condensation system operation control device includes: an acquisition unit, which is used to acquire the operating parameters of the main unit; a control unit, which is used to control the rotation speed of the condensation pump according to the operating parameters of the main unit; and a regulating unit, which is used to control the condensation pump to operate at a first rotation speed when the operating parameters of the main unit reach a first threshold value, and to adjust the opening of the regulating valve to control the water level of the condenser.

[0016] According to a third aspect of the present invention, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the operation control method of the condensation system in the first aspect of the present invention or any possible implementation of the first aspect are implemented.

[0017] According to a fourth aspect of the present invention, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for controlling the operation of a condensation system in the first aspect of the present invention or any possible implementation of the first aspect are implemented.

[0018] The technical solution provided by the present invention brings at least the following beneficial effects:

[0019] The present invention provides an operation control method for a condensate system, which uses the operation parameters of a host to control the rotation speed of a condensate pump, decouples the control of a condenser and a condensate pump, and can effectively control the water level of the condenser, especially when the S ratio is less than 0.3, to avoid the problem of system instability caused by too small a pressure difference of a regulating valve. At the same time, by decoupling the control of the condenser and the condensate pump, when the operation parameters of the host change, the rotation speed of the condensate pump and the opening of the regulating valve are adjusted in time, so as to maintain the stable state of the condensate system and improve the reliability and efficiency of the condensate system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 A schematic flow chart of an operation control method of a condensate system provided in an embodiment of the present invention;

[0023] Figure 2A schematic diagram of the structure of a condensation system provided in an embodiment of the present invention;

[0024] Figure 3 A schematic flow chart of another method for controlling the operation of a condensate system provided by an embodiment of the present invention;

[0025] Figure 4 A block diagram of an operation control device for a condensate system provided by an embodiment of the present invention;

[0026] Figure 5 A block diagram of an electronic device provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of a test system provided by an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the result of controlling the change of the condenser liquid level according to the host operating conditions when the S ratio is 0.1 provided in an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the result of controlling the condensate pump speed according to the main engine operating condition when the S ratio is 0.1 provided in an embodiment of the present invention;

[0030] Fig. 9 A schematic diagram of the result of controlling the change of the condenser liquid level according to the pressure drop of the regulating valve when the S ratio is 0.1 provided in an embodiment of the present invention;

[0031] Fig.10 A schematic diagram of the result of controlling the condensate pump speed according to the pressure drop of the regulating valve when the S ratio is 0.1 provided in an embodiment of the present invention;

[0032] Fig.11 A schematic diagram of the result of controlling the change of the condenser liquid level according to the main engine operating conditions when the S ratio is 0.06 provided in an embodiment of the present invention;

[0033] Fig.12 A schematic diagram of the result of controlling the condensate pump speed according to the main engine operating conditions when the S ratio is 0.06 provided in an embodiment of the present invention;

[0034] Fig.13 A schematic diagram of the result of controlling the change of the condenser liquid level according to the pressure drop of the regulating valve when the S ratio is 0.06 provided in an embodiment of the present invention;

[0035] Fig.14 A schematic diagram of the result of controlling the rotation speed of the condensate pump according to the pressure drop of the regulating valve when the S ratio is 0.06 provided in an embodiment of the present invention.

[0036] Figure 1 , Figures 4 to 6 The corresponding relationship between the reference numerals and the component names is as follows:

[0037] 1 condensate system, 11 host, 12 condensate pump, 13 regulating valve, 14 condenser, 15 feed water pump, 2 test system, 21 drain valve, 22 inlet valve, 23 simulated condenser, 24 simulated condensate pump, 25 simulated deaerator, 26 simulated feed water pump, 27 simulated regulating valve, 28 stop valve, 29 throttling orifice, 100 operation control device of condensate system, 110 acquisition unit, 120 control unit, 130 regulating unit, electronic device 200, memory 210, processor 220. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention provides an operation control method of a condensation system, which is used for a condensation system 1, such as Figure 1 As shown, the condensate system 1 includes a main unit 11, a condensate pump 12, a regulating valve 13 and a condenser 14. Figure 2 As shown, the operation control method of the condensate system includes:

[0040] S101: Obtaining operating parameters of the host;

[0041] S102: controlling the rotation speed of the condensate pump according to the operating parameters of the host machine;

[0042] S103: When the operating parameter of the main engine reaches a first threshold, the condensate pump is controlled to operate at a first speed, and the opening of the regulating valve is adjusted to control the water level of the condenser.

[0043] The operation control method of the condensation system provided by the present invention is used for the condensation system, and the condensation system includes a main engine, a condensation pump, a regulating valve and a condenser. The operation control method of the condensation system includes: obtaining the operation parameters of the main engine, that is, monitoring the operation parameters of the main engine in real time, and controlling the rotation speed of the condensation pump according to the obtained operation parameters of the main engine. When the operation parameters of the main engine reach the first threshold, the condensation pump is operated at a fixed rotation speed and the opening of the regulating valve is adjusted to control the water level of the condenser, thereby realizing precise control of the condensation system. That is, when the main engine reaches a certain operating point, the condensation pump is controlled to remain unchanged at a certain specific rotation speed, and the water level control at this time is only realized by adjusting the opening of the regulating valve. The present application uses the operation parameters of the main engine to control the rotation speed of the condensation pump, decouples the control of the condenser and the condensation pump, and can effectively control the water level of the condenser, especially when the S ratio is less than 0.3, to avoid the problem of system instability caused by too small pressure difference of the regulating valve. At the same time, by decoupling the control of the condenser and the condensate pump, when the operating parameters of the main engine change, the condensate pump speed and the regulating valve opening can be adjusted in time to maintain the stable state of the condensate system and improve the reliability and efficiency of the condensate system.

[0044] The traditional control method uses a tight coupling between the condensate pump speed and the condenser water level control. However, due to the low S, even if the opening of the regulating valve changes significantly, the flow rate through the valve will not change significantly. Due to the small pressure difference of the regulating valve, in order to maintain the water level stability, the regulating valve needs to adjust the opening frequently and significantly. This frequent valve position change will cause the regulating valve position to fluctuate greatly. When the regulating valve position fluctuates frequently, the condensate pump speed will also change frequently, resulting in speed oscillation, which will affect the stability of the system.

[0045] Optionally, in some embodiments, the step of controlling the rotation speed of the condensate pump according to the operating parameters of the host includes: obtaining a performance curve of the condensate pump; and establishing a relationship between the operating parameters of the host and the rotation speed of the condensate pump according to the performance curve.

[0046] In this embodiment, the performance curve of the condensate pump is first obtained, and then the relationship between the operating parameters of the host and the rotational speed of the condensate pump is established according to the performance curve. Each type of condensate pump has a different performance curve, and the performance curve of the condensate pump shows the flow, head and power characteristics of the condensate pump at different rotational speeds. According to the relationship between the operating parameters of the host and the rotational speed of the condensate pump, the rotational speed of the condensate pump is controlled to ensure the operating stability of the condensate system.

[0047] Optionally, in some embodiments, the step of establishing the relationship between the operating parameters of the main engine and the speed of the condensate pump according to the performance curve includes: determining the initial speed of the condensate pump; at the initial speed of the condensate pump, measuring the inlet pressure and the outlet pressure of the regulating valve to obtain the measured pressure difference of the regulating valve; gradually adjusting the speed of the condensate pump until the measured pressure difference of the regulating valve is consistent with the rated operating condition of the main engine; when the measured pressure difference of the regulating valve is consistent with the rated operating condition of the main engine, recording the operating parameters of the main engine and the speed of the condensate pump.

[0048] In this embodiment, the initial speed of the condensate pump is first determined, and then the inlet pressure and outlet pressure of the regulating valve are measured at the initial speed of the condensate pump to obtain the measured pressure difference of the regulating valve, and then the speed of the condensate pump is gradually adjusted until the measured pressure difference of the regulating valve is consistent with the rated working condition of the host, and finally when the measured pressure difference of the regulating valve is consistent with the rated working condition of the host, the operating parameters of the host and the speed of the condensate pump are recorded. That is, by adjusting the speed of the condensate pump, the speed of the condensate pump affects the pressure difference of the regulating valve, and the pressure difference of the regulating valve is also the pressure difference between the water inlet and the water outlet of the regulating valve. When the actual pressure difference of the regulating valve is consistent with the rated working condition of the host, the operating parameters of the host and the speed of the condensate pump are recorded at this time, so as to determine the speed of the condensate pump corresponding to the host under different working conditions, and a relationship table is constructed by the operating parameters of the host and the speed of the condensate pump, and the speed of the condensate pump is further controlled according to the relationship table to ensure that the condensate system can operate stably under different working conditions.

[0049] Optionally, in some embodiments, the step of determining the initial speed of the condensate pump includes: obtaining the system resistance and condensate flow of the condensate system; determining the initial speed of the condensate pump according to the system resistance, condensate flow and performance curve; wherein the system resistance includes the resistance of the regulating valve and the resistance of the pipeline.

[0050] In this embodiment, when determining the initial speed of the condensate pump, first, the system resistance and condensate flow rate of the condensate system are obtained, and then the initial speed of the condensate pump is determined according to the system resistance, condensate flow rate and performance curve. The system resistance includes the resistance of the regulating valve and the resistance of the pipeline. The resistance of the regulating valve and the resistance of the pipeline are both known parameters, and the system resistance can be directly obtained. In order to improve the calculation accuracy, other additional resistances can also be calculated into the system resistance. Determining the initial speed of the condensate pump according to the system resistance, condensate flow rate and performance curve can make the condensate pump in a more appropriate working state at the time of startup, so that the pressure difference of the regulating valve is close to the rated working condition of the main engine, thereby reducing the number of times the speed of the condensate pump is adjusted, and improving the efficiency of building the relationship between the operating parameters of the main engine and the speed of the condensate pump.

[0051] Optionally, in some embodiments, the step of determining the initial speed of the condensate pump according to the system resistance, the condensate flow rate and the performance curve includes: obtaining the S ratio, which is the ratio of the pressure difference of the regulating valve to the system resistance; determining the theoretical pressure difference of the regulating valve according to the system resistance and the S ratio; and finding the corresponding initial speed of the condensate pump on the performance curve according to the theoretical pressure difference of the regulating valve, the condensate flow rate and the system resistance.

[0052] In this embodiment, when determining the initial speed of the condensate pump according to the system resistance, condensate flow rate and performance curve, first obtain the S ratio, where the S ratio is the ratio of the pressure difference of the regulating valve to the system resistance, then determine the theoretical pressure difference of the regulating valve according to the system resistance and the S ratio, and finally find the corresponding initial speed of the condensate pump on the performance curve according to the theoretical pressure difference of the regulating valve, the condensate flow rate and the system resistance. In other words, by obtaining the S ratio and determining the theoretical pressure difference of the regulating valve, and then finding the initial speed of the condensate pump on the performance curve, this method can accurately determine the initial speed of the condensate pump, which can not only reduce the energy waste during the startup process, but also make the condensate pump in a more suitable working state when it is started.

[0053] like Figure 3 As shown, the present invention provides another operation control method of a condensate system, comprising:

[0054] S201: Obtaining operating parameters of the host;

[0055] S202: Obtaining a performance curve of a condensate pump;

[0056] S203: Obtaining system resistance and condensate flow of the condensate system;

[0057] S204: Obtaining S ratio;

[0058] S205: Determine the theoretical pressure difference of the regulating valve according to the system resistance and the S ratio;

[0059] S206: Finding the corresponding initial speed of the condensate pump on the performance curve according to the theoretical pressure difference of the regulating valve, the condensate flow rate and the system resistance;

[0060] S207: At the initial speed of the condensate pump, measuring the inlet pressure and the outlet pressure of the regulating valve to obtain a measured pressure difference of the regulating valve;

[0061] S208: gradually adjust the rotation speed of the condensate pump until the measured pressure difference of the regulating valve is consistent with the rated working condition of the main engine;

[0062] S209: When the measured pressure difference of the regulating valve is consistent with the rated working condition of the main engine, the operating parameters of the main engine and the speed of the condensate pump are recorded;

[0063] S210: When the operating parameter of the main engine reaches a first threshold, the condensate pump is controlled to operate at a first speed, and the opening of the regulating valve is adjusted to control the water level of the condenser.

[0064] Optionally, in some embodiments, Figure 1 As shown, the condensate system further includes a water replenishment pump 15 , which replenishes water into the condensate system 1 to maintain a stable pressure in the condensate system 1 .

[0065] In this embodiment, the water replenishment pump 15 in the condensate system 1 replenishes water to the system to maintain the pressure in the system stable, thereby ensuring that the pressure in the condensate system 1 is always kept within a predetermined range. When the amount of water in the system decreases due to evaporation or other reasons, the water replenishment pump 15 replenishes water in time to prevent the system pressure from dropping and ensure the normal operation of the system. At the same time, the automatic water replenishment function of the water replenishment pump 15 can simplify the operation and maintenance of the condensate system and reduce the maintenance workload of the staff.

[0066] Optionally, in some embodiments, the main engine 11 is a steam turbine generator, and the operating parameters of the main engine 11 include load parameters and steam parameters.

[0067] In this embodiment, the operating parameters of the main engine 11 include load parameters and steam parameters. The load parameters reflect the actual electrical power output by the steam turbine generator, and the steam parameters include steam pressure and steam temperature. The steam pressure is divided into inlet pressure and exhaust pressure. The inlet pressure refers to the initial pressure of the steam entering the steam turbine, and the exhaust pressure is the pressure when the steam is discharged after doing work in the steam turbine. The steam temperature is also divided into inlet temperature and exhaust temperature. According to the operating parameters of multiple main engines 11, the speed of the condensate pump 12 can be accurately controlled to avoid the unstable operation of the condensate system caused by excessive changes in the speed of the condensate pump 12, thereby improving the operational reliability and operational stability of the condensate system.

[0068] According to the present invention, a condensation system operation control device 100 is used for a condensation system 1, wherein the condensation system comprises a main unit 11, a condensation pump 12, a regulating valve 13 and a condenser 14. Figure 4 As shown, the operation control device 100 of the condensate system includes: an acquisition unit 110, used to acquire the operating parameters of the main engine; a control unit 120, used to control the speed of the condensate pump according to the operating parameters of the main engine; and a regulating unit 130, used to control the condensate pump to operate at a first speed when the operating parameters of the main engine reach a first threshold value, and to adjust the opening of the regulating valve to control the water level of the condenser.

[0069] The operation control device 100 of the condensing system provided by the present invention is used for the condensing system 1, and the condensing system 1 includes a main unit 11, a condensing pump 12, a regulating valve 13 and a condenser 14. The operation control device 100 of the condensing system includes: an acquisition unit 110, a control unit 120 and an adjustment unit 130, wherein the acquisition unit 110 is used to acquire the operation parameters of the main unit, that is, to monitor the operation parameters of the main unit in real time, the control unit 120 is used to control the speed of the condensing pump according to the acquired operation parameters of the main unit, and the adjustment unit 130 is used to control the condensing pump to operate at a fixed speed when the operation parameters of the main unit reach a first threshold value, and adjust the opening of the regulating valve to control the water level of the condenser, so as to achieve precise control of the condensing system. That is, when the main unit reaches a certain operating point, the condensing pump is controlled to remain unchanged at a certain specific speed, and the water level control at this time is only achieved by adjusting the opening of the regulating valve. This application uses the operating parameters of the host to control the speed of the condensate pump, decoupling the control of the condenser and the condensate pump, especially when the S ratio is less than 0.3, it can effectively control the water level of the condenser and avoid the problem of system instability caused by too small a pressure difference of the regulating valve. At the same time, by decoupling the control of the condenser and the condensate pump, when the operating parameters of the host change, the condensate pump speed and the regulating valve opening are adjusted in time, the stable state of the condensate system can be maintained, and the reliability and efficiency of the condensate system can be improved.

[0070] The present invention provides a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the operation control method of the water condensation system in the first aspect of the present invention or any possible implementation of the first aspect are implemented.

[0071] like Figure 5 As shown, the present invention provides an electronic device 200, including a memory 210, a processor 220, and a computer program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the computer program, the steps of the operation control method of the condensation system in the first aspect of the present invention or any possible implementation method of the first aspect are implemented.

[0072] The implementation process of the functions and effects of each unit in the above system is specifically described in the implementation process of the corresponding steps in the above method, which will not be repeated here.

[0073] In a specific application, the present invention proposes a test bench based on a condensate system, and compares the control logic effect of the condensate system control method of the present application with the control logic effect of controlling the rotation speed of the condensate pump by regulating the pressure difference of the valve.

[0074] like Figure 6As shown, the test system 2 includes two parts. The condensate part is composed of a drain valve 21, a water inlet valve 22, a simulated condenser 23 (a water tank with a volume of about 1 cubic meter), a simulated condensate pump 24, a simulated deaerator 25 (a water tank with a volume of about 3 cubic meters), a simulated condensate pump 24 (rated flow rate 25t / h, rated head 570m), a simulated regulating valve 27, a stop valve 28 and a throttling orifice 29. The stop valve 28 and the throttling orifice 29 are used to adjust the system resistance. The water supply part is composed of a simulated water supply pump 26 and a stop valve 28. Figure 6 The PT (Pressure Transmitter) marked in the figure indicates a pressure transmitter. A pressure transmitter is used to measure the pressure of liquid, gas or steam. It is an instrument that can convert the measured pressure value into a standard electrical signal output. Figure 6 The mark F in the figure represents a throttling orifice plate 29, and the throttling orifice plate 29 is provided to change the pressure of the liquid, gas or steam in the pipeline.

[0075] Step 1: Parameter setting. In order to verify that the control scheme of this application has a good effect under low S ratio, the S ratio is selected as 0.1 and 0.06 to verify the stability of the host state switching. First, the condensate flow rate under three host states is set, namely, host high load, host medium load and host low load. According to the S ratio, condensate flow rate and pipeline resistance characteristics, the theoretical value of the system resistance after simulating the condensate pump 24 under different host states can be calculated, and then the speed of the simulated condensate pump 24 can be inferred based on the condensate flow rate and system resistance. As shown in Table 1, when the S ratio is 0.1, when the host is in a high load state, the condensate flow rate is 14.2t / h, and the speed of the simulated condensate pump 24 is 3000rpm; when the host is in a medium load state, the condensate flow rate is 10.9t / h, and the speed of the simulated condensate pump 24 is 2320rpm; when the host is in a low load state, the condensate flow rate is 6.0t / h, and the speed of the simulated condensate pump 24 is 1450rpm. When the S ratio is 0.06, when the main engine is in high load state, the condensate flow rate is 11.2t / h, and the speed of the simulated condensate pump 24 is 3000rpm; when the main engine is in medium load state, the condensate flow rate is 8.9t / h, and the speed of the simulated condensate pump 24 is 2500rpm; when the main engine is in low load state, the condensate flow rate is 4.9t / h, and the speed of the simulated condensate pump 24 is 1560rpm. At the same time, since the test system 2 reduces the S ratio by increasing the pipeline resistance, the maximum flow rate of the entire system decreases when the S ratio decreases.

[0076] Table 1:

[0077]

[0078] Step 2: Steady-state condition setting. Run the simulated condensate pump 24 and the simulated make-up water pump 26, balance the simulated condensate pump 24 outlet flow and the make-up water flow, and the parameters of the simulated condensate pump 24 are the same as the theoretical values. Adjust the speed of the simulated condensate pump 24 and the opening of the simulated regulating valve 27 of the main condensate throttling, keep the flow rate unchanged, make the pressure drop of the simulated regulating valve 27 in state 2 and state 3 consistent with that in state 1, and set the speed of the simulated condensate pump 24. The relationship between the speed of the simulated condensate pump 24 and the main condensate flow after setting is input into the control system, and the simulated condensate pump 24 can be automatically controlled. At the same time, observe whether the liquid level of the simulated condenser 23 can remain stable when the test system 2 switches states.

[0079] Step 3: Apply the effect:

[0080] 1. When the S ratio is 0.1, the test results of the host operating condition control simulating the condensate pump 24 speed are as follows Figure 7 and Figure 8 The liquid level setting value of the simulated condenser 23 is 615mm. During the whole test, the highest and lowest values ​​of the liquid level are 621.5mm and 610mm respectively, with a deviation of 6.5mm and 5mm from the set liquid level, and the maximum fluctuation of the liquid level is 1.06%. In the traditional method, the test results of controlling the speed of the simulated condensate pump 24 by the pressure drop of the simulated regulating valve 27 are shown as follows: Fig. 9 and Fig.10 The liquid level setting value of the simulated condenser 23 is 615mm. During the whole test, the highest and lowest values ​​of the liquid level are 642mm and 600.6mm respectively, with deviations of 27mm and 14.4mm from the set liquid level. The maximum fluctuation of the liquid level value is 4.39%, and the speed fluctuation of the simulated condensate pump 24 is relatively large.

[0081] 2. When the S ratio is 0.06, the test results of the host operating condition control simulating the condensate pump 24 speed are as follows Fig.11 and Fig.12 As shown. The setting value of the liquid level of the simulated condenser 23 is 615mm. During the whole test process, the highest and lowest values ​​of the liquid level are 622mm and 609mm respectively, with a deviation of 7mm and 6mm from the set liquid level, and the maximum fluctuation of the liquid level value is 1.14%. In the traditional method, the test results of controlling the speed of the simulated condensate pump 24 by the pressure drop of the simulated regulating valve 27 are shown as follows Fig.13 and Fig.14 The liquid level setting value of the simulated condenser 23 is 615 mm. During the whole test, the highest and lowest values ​​of the liquid level are 655.3 mm and 602.6 mm respectively, with deviations of 40.3 mm and 12.4 mm from the set liquid level. The maximum fluctuation of the liquid level value is 6.55%, and the speed fluctuation of the simulated condensate pump 24 is relatively large.

[0082] From the comparison results, the control scheme of this application has good water level control performance at low S ratio, and the water level deviation is within the range of ±10mm, and it does not change much when the S ratio decreases. However, when the pressure difference of the simulated regulating valve 27 is used to control the speed of the simulated condensate pump 24, the deviation reaches ±40mm when the S ratio decreases to 0.06. The condensate system control scheme proposed in this application has achieved good application results.

[0083] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0084] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method for controlling the operation of a condensate system, characterized in that: Used in a condensing water system, the condensing water system includes a main engine, a condensing water pump, a regulating valve and a condenser, and the operation control method of the condensing water system includes: Obtaining operating parameters of the host; Controlling the rotation speed of the condensate pump according to the operating parameters of the host machine; When the operating parameter of the main engine reaches a first threshold, the condensate pump is controlled to operate at a first speed, and the opening of the regulating valve is adjusted to control the water level of the condenser.

2. The operation control method of the condensate system according to claim 1, characterized in that: The step of controlling the rotation speed of the condensate pump according to the operating parameters of the host comprises: Obtain the performance curve of the condensate pump; A relationship between the operating parameters of the main engine and the rotational speed of the condensate pump is established according to the performance curve.

3. The operation control method of the condensate system according to claim 2, characterized in that: The step of establishing the relationship between the operating parameters of the main engine and the rotation speed of the condensate pump according to the performance curve comprises: determining an initial rotation speed of the condensate pump; At the initial rotation speed of the condensate pump, measuring the inlet pressure and the outlet pressure of the regulating valve to obtain a measured pressure difference of the regulating valve; gradually adjusting the rotation speed of the condensate pump until the measured pressure difference of the regulating valve is consistent with the rated working condition of the main engine; When the measured pressure difference of the regulating valve is consistent with the rated working condition of the main engine, the operating parameters of the main engine and the rotation speed of the condensate pump are recorded.

4. The operation control method of the condensate system according to claim 3, characterized in that: The step of determining the initial rotation speed of the condensate pump comprises: Obtaining the system resistance and condensate flow rate of the condensate system; determining an initial rotation speed of the condensate pump according to the system resistance, the condensate flow rate and the performance curve; The system resistance includes the resistance of the regulating valve and the resistance of the pipeline.

5. The operation control method of the condensate system according to claim 4, characterized in that: The step of determining the initial rotation speed of the condensate pump according to the system resistance, the condensate flow rate and the performance curve comprises: Obtaining an S ratio, wherein the S ratio is a ratio of a pressure difference of the regulating valve to a resistance of the system; Determining a theoretical pressure difference of the regulating valve according to the system resistance and the S ratio; The corresponding initial rotation speed of the condensate pump is found on the performance curve according to the theoretical pressure difference of the regulating valve, the condensate flow rate and the system resistance.

6. The operation control method of the condensate system according to any one of claims 1 to 5, characterized in that: The condensate system further includes a water replenishment pump, which replenishes water into the condensate system to maintain a stable pressure in the condensate system.

7. The operation control method of the condensate system according to any one of claims 1 to 5, characterized in that: The main engine is a steam turbine generator, and the operating parameters of the main engine include load parameters and steam parameters.

8. An operation control device for a condensate system, characterized in that: Used in a condensing water system, the condensing water system includes a main engine, a condensing water pump, a regulating valve and a condenser, and the operation control device of the condensing water system includes: An acquisition unit, used for acquiring the operating parameters of the host; A control unit, used for controlling the rotation speed of the condensate pump according to the operating parameters of the host machine; The regulating unit is used to control the condensate pump to operate at a first speed and to adjust the opening of the regulating valve to control the water level of the condenser when the operating parameter of the main engine reaches a first threshold.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the operation control method of the water condensation system according to any one of claims 1 to 7 are implemented.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the operation control method of the condensate system according to any one of claims 1 to 7 are implemented.

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