Temperature control system and method for steam condensation water heating outlet of nuclear energy heat supply preheater

Abstract

The invention belongs to the technical field of nuclear energy steam supply application, and discloses a nuclear energy heat supply preheater heating steam condensation water outlet temperature control system and method.The system comprises a set of first-stage preheaters arranged in parallel, one outlet of each set of first-stage preheaters is connected with industrial steam outlet adjusting equipment, and the other outlet of each set of first-stage preheaters is connected with industrial steam outlet adjusting equipment; the industrial steam outlet adjusting equipment is connected with the deaerator, the other outlet is connected with the outlet valve equipment, the outlet valve equipment is connected with the condenser, heating steam condensation water is introduced into one inlet of each group of primary preheaters, and the other inlet is used for primary water supply. Accurate control over the temperature of the steam condensation water heating outlets of the nuclear energy heat supply pre-heaters is achieved, the water hammer problem caused by the temperature difference of the steam condensation water heating outlets of the multiple pre-heaters is solved, and the nuclear energy heat supply pre-heater control method has great significance in reducing the operation risk and the commissioning time and creating more economic values.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear energy steam supply application, and in particular, relates to a nuclear energy heating preheater heating steam condensate outlet temperature control system and method. Background Art

[0002] Nuclear energy is a clean and efficient energy source. The unique carbon-free and high-efficiency characteristics of nuclear energy are incomparable to traditional fossil energy, especially in relatively concentrated high-energy-consuming industrial parks, where the industrial use of nuclear energy has obvious advantages. In recent years, the exchanges and interactions between domestic nuclear power plants and industrial users have increased significantly, and both sides are actively expanding scientific research exploration of the comprehensive utilization of nuclear energy. The nuclear energy industrial steam demonstration project of a nuclear power plant has been at the forefront of technology, with remarkable results, and has attracted great attention from domestic and foreign peers. The project has a leading demonstration role in the field of industrial use of nuclear energy.

[0003] Taking a nuclear energy industrial steam demonstration project as an example, the desalted water from the desalted water system of the industrial steam production system is heated by the first-level feed water pump through the preheater and sent to the deaerator for deoxygenation, and then pressurized by the second-level feed water pump and sent to the steam generator through the second-level feed water preheater, taking away the heat released by the steam and converting it into industrial steam. Such a continuous heat exchange process realizes the continuous supply of industrial steam.

[0004] Normally, the preheaters are preheated in several groups in parallel. For example, in a nuclear industrial steam project, the primary feed water enters four primary preheaters through the header and then supplies water to the deaerator. Due to the different layout positions of the preheaters and the different lengths and numbers of elbows of the desalted water entering the preheater pipes, the pipe resistance is different. The flow distribution on the feed water side of each preheater is uneven, resulting in a large temperature difference at the outlet of the preheater when the steam condensate heated by each preheater is heated. The outlet temperature of some condensate exceeds the design value, causing water hammer in the condensate header, which poses a great safety hazard to the operation of nuclear industrial steam equipment. Summary of the invention

[0005] The purpose of the present application is to provide a nuclear energy heating preheater heating steam condensate outlet temperature control system and method, so as to achieve precise control of the nuclear energy heating preheater heating steam condensate outlet temperature and prevent water hammer problems caused by the temperature difference of the heating steam condensate outlets of multiple preheaters.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] In the first aspect, the present application provides a nuclear energy heating preheater heated steam condensate outlet temperature control system, including a group of primary preheaters arranged in parallel, one of the outlets of each group of the primary preheaters is connected to an industrial steam outlet regulating device, the industrial steam outlet regulating device is connected to a deaerator, and the other outlet is connected to an outlet valve device, and the outlet valve device is connected to a condenser; one of the inlets of each group of the primary preheaters is fed with heated steam condensate, and the other inlet is used for primary water supply.

[0008] In some embodiments, an outlet thermometer and an outlet flow meter are provided on the pipeline leading to the condenser from each group of the first-stage preheaters.

[0009] In some embodiments, the first-stage preheater includes a first-stage preheater A, a first-stage preheater B, a first-stage preheater C and a first-stage preheater D. The heated steam condensate A is passed into the first-stage preheater A through a first pipeline, the heated steam condensate B is passed into the first-stage preheater B through a fifth pipeline, the heated steam condensate C is passed into the first-stage preheater C through a ninth pipeline, and the heated steam condensate D is passed into the first-stage preheater D through a thirteenth pipeline.

[0010] In some embodiments, the first pipeline is provided with a heating steam condensate A inlet valve, the fifth pipeline is provided with a heating steam condensate B inlet valve, the ninth pipeline is provided with a heating steam condensate C inlet valve, and the thirteenth pipeline is provided with a heating steam condensate D inlet valve.

[0011] In some embodiments, the third pipeline is connected to the first-level preheater A, and the third pipeline is provided with a first-level water supply inlet valve of line A; the seventh pipeline is connected to the first-level preheater B, and the seventh pipeline is provided with a first-level water supply inlet valve of line B; the eleventh pipeline is connected to the first-level preheater C, and the eleventh pipeline is provided with a first-level water supply inlet valve of line C; the fifteenth pipeline is connected to the first-level preheater D, and the fifteenth pipeline is provided with a first-level water supply inlet valve of line D.

[0012] In some embodiments, a second pipeline connects the first-level preheater A and the condenser, and a heating steam condensate A outlet valve, a heating steam condensate A outlet thermometer, and a heating steam condensate A outlet flowmeter are sequentially provided on the second pipeline; a sixth pipeline connects the first-level preheater B and the condenser, and a heating steam condensate B outlet valve, a heating steam condensate B outlet thermometer, and a heating steam condensate B outlet flowmeter are sequentially provided on the sixth pipeline; a tenth pipeline connects the first-level preheater C and the condenser, and a heating steam condensate C outlet valve, a heating steam condensate C outlet thermometer, and a heating steam condensate C outlet flowmeter are sequentially provided on the tenth pipeline; a fourteenth pipeline connects the first-level preheater D and the condenser, and a heating steam condensate D outlet valve, a heating steam condensate D outlet thermometer, and a heating steam condensate D outlet flowmeter are sequentially provided on the fourteenth pipeline.

[0013] In some embodiments, the fourth pipeline connects the first-level preheater A and the deaerator, and the fourth pipeline is provided with an A-line industrial steam outlet regulating valve and an A-line industrial steam outlet stop valve in sequence; the eighth pipeline connects the first-level preheater B and the deaerator, and the eighth pipeline is provided with a B-line industrial steam outlet regulating valve and a B-line industrial steam outlet stop valve in sequence; the twelfth pipeline connects the first-level preheater C and the deaerator, and the twelfth pipeline is provided with a C-line industrial steam outlet regulating valve and a C-line industrial steam outlet stop valve in sequence; the sixteenth pipeline connects the first-level preheater C and the deaerator, and the sixteenth pipeline is provided with a D-line industrial steam outlet regulating valve and a D-line industrial steam outlet stop valve in sequence.

[0014] In a second aspect, the present application provides a method for controlling the outlet temperature of steam condensate of a nuclear energy heating preheater, comprising:

[0015] Step 1: Complete the water injection and flushing steps of the primary preheater, deaerator, secondary preheater and evaporator industrial side according to the process flow;

[0016] Step 2: Open the A-way industrial steam outlet regulating valve and A-way industrial steam outlet stop valve of the primary preheater A, and keep the industrial side of the primary preheater full;

[0017] Step 3: Put the primary preheater A into operation, open the inlet valve of heating steam condensate A and the outlet valve of heating steam condensate A, and start supplying heating steam condensate to heat the primary feed water on the shell side of the preheater;

[0018] Step 4: According to the drop in the liquid level in the evaporator downstream of the primary preheater, gradually open the primary water supply inlet valve of line A, and supply the primary water supply to the industrial side of the preheater;

[0019] Step 5: Put the primary preheater B into operation;

[0020] Step 6: After the primary preheater A and the primary preheater B are fully operational, adjust the industrial steam outlet regulating equipment of the primary preheater A and the primary preheater B according to the flow meter equipment and the thermometer equipment of the heating steam condensate A and the heating steam condensate B at the outlet of the primary preheater, and adjust the industrial steam outlet temperature deviation of the primary preheater A and the primary preheater B to not exceed 2°C;

[0021] Step 7: Put the primary preheater C and the primary preheater D into operation, and adjust the industrial steam outlet temperatures of the primary preheater A, the primary preheater B, the primary preheater C, and the primary preheater D to a value within 2°C of each other;

[0022] Step 8: When the load changes, if the outlet temperature of the heating steam condensate of a preheater is increased, slowly adjust the corresponding regulating valve device to increase the flow rate on the water supply side, and observe the decrease in the outlet temperature of the corresponding heating steam condensate, and adjust until the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C, and the first-stage preheater D deviate from each other by no more than 2°C, and then stop;

[0023] Step 9: When the load changes, if the outlet temperature of the heating steam condensate of a preheater is lowered, slowly adjust the corresponding regulating valve to reduce the flow on the water supply side, and observe the increase in the outlet temperature of the heating steam condensate. Adjust the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C, and the first-stage preheater D to within 2°C of each other and stop.

[0024] In some embodiments, step 5 includes:

[0025] Open the B-way industrial steam outlet regulating valve and B-way industrial steam outlet stop valve of the first-stage preheater B, and keep the industrial side of the first-stage preheater full;

[0026] Put the primary preheater B into operation, open the heating steam condensate B inlet valve and the heating steam condensate B outlet valve, and start supplying heating steam condensate to heat the primary feed water on the shell side of the preheater;

[0027] According to the decrease in the liquid level in the evaporator downstream of the first-stage preheater, the first-stage water supply inlet valve of line B of the first-stage preheater B is gradually opened, and the first-stage water supply is put into supplying water to the industrial side of the preheater.

[0028] In some embodiments, step 7 includes:

[0029] Open the C-line industrial steam outlet regulating valve and C-line industrial steam outlet stop valve of the first-level preheater C, and keep the industrial side of the first-level preheater full; put the first-level preheater C into operation, open the C-line inlet valve and the C-line outlet valve of the heating steam condensate, and start supplying the heating steam condensate to heat the first-level feed water on the shell side of the preheater; according to the drop in the liquid level in the evaporator downstream of the first-level preheater, gradually open the C-line first-level feed water inlet valve, and put the first-level feed water into the industrial side of the preheater;

[0030] Open the D-line industrial steam outlet regulating valve and D-line industrial steam outlet stop valve of the first-level preheater D, and keep the industrial side of the first-level preheater full; put the first-level preheater D into operation, open the D-line inlet valve and the D-line outlet valve of the heating steam condensate, and start supplying the heating steam condensate to heat the first-level feed water on the shell side of the preheater; according to the drop in the liquid level in the evaporator downstream of the first-level preheater, gradually open the D-line first-level feed water inlet valve, and put the first-level feed water into the industrial side of the preheater;

[0031] Adjust the industrial steam outlet regulating equipment of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C and the first-stage preheater D according to the flow meter equipment and the thermometer equipment of the heating steam condensate A, the heating steam condensate B, the heating steam condensate C and the heating steam condensate D at the outlet of the first-stage preheater, and adjust the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C and the first-stage preheater D to within 2°C of each other.

[0032] Compared with the prior art, the nuclear energy heating preheater heating steam condensate outlet temperature control system and method provided in this application has the following beneficial effects:

[0033] At present, the industrial use of nuclear energy at home and abroad is still in a stage of technical exploration. How to prevent the water hammer problem caused by the temperature difference of the heating steam condensate outlet of multiple preheaters is still in a technical blank stage. The design scheme of controlling the outlet temperature of the heating steam condensate of a nuclear energy heating preheater provided in this application fills the technical gap.

[0034] This application is of great significance in reducing operational risks and commissioning time and creating more economic value.

[0035] Furthermore, a flow meter and a thermometer are added to the outlet of the heated steam condensate on the heating side of the nuclear energy heating preheater to comprehensively display the condensate load, which more accurately represents the heating amount, and the heating amount is used to accurately control the flow rate of the heated feed water.

[0036] Furthermore, a regulating valve is added to the outlet of the feed water side of the nuclear energy heating preheater, and the feed water side flow is adjusted according to the outlet temperature of the condensate water on the heating side when the load changes, so as to more effectively control the outlet temperature of the heating steam condensate water on the heating side of the preheater.

[0037] Furthermore, by accurately controlling the outlet temperature of the heated steam condensate on the heating side of the nuclear energy heating preheater, the water hammer phenomenon caused by excessive temperature difference of the condensate outlets on the heating sides of multiple preheaters can be prevented, thereby reducing the operating risk of the nuclear power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the technical description.

[0039] Figure 1 A schematic diagram of the structure of the nuclear energy heating preheater heating steam condensate outlet temperature control system provided in this application;

[0040] Figure 2 A flow chart of a method for controlling the outlet temperature of steam condensate heated in a nuclear energy heating preheater provided in this application.

[0041] Description of reference numerals:

[0042] 1. Primary preheater A; 2. Primary preheater B; 3. Primary preheater C; 4. Primary preheater D; 5. Heating steam condensate A-line inlet valve; 6. Heating steam condensate A-line outlet valve; 7. A-line primary water supply inlet valve; 8. A-line industrial steam outlet regulating valve; 9. A-line industrial steam outlet stop valve; 10. Heating steam condensate B-line inlet valve; 11. Heating steam condensate B-line outlet valve; 12. B-line primary water supply inlet valve; 13. B-line industrial steam outlet regulating valve; 14. B-line industrial steam outlet stop valve; 15. Heating steam condensate C-line inlet valve; 16. Heating steam condensate C-line outlet valve; 17. C-line primary water supply inlet valve; 18. C-line industrial steam outlet stop valve Steam outlet regulating valve; 19. Industrial steam outlet stop valve on line C; 20. Inlet valve on line D for heating steam condensate; 21. Outlet valve on line D for heating steam condensate; 22. First-level feed water inlet valve on line D; 23. Industrial steam outlet regulating valve on line D; 24. Industrial steam outlet stop valve on line D; 25. Thermometer on line A for heating steam condensate; 26. Flowmeter on line A for heating steam condensate; 27. Thermometer on line B for heating steam condensate; 28. Flowmeter on line B for heating steam condensate; 29. ​​Thermometer on line C for heating steam condensate; 30. Flowmeter on line C for heating steam condensate; 31. Thermometer on line D for heating steam condensate; 32. Flowmeter on line D for heating steam condensate. DETAILED DESCRIPTION

[0043] The following is further explained in detail through specific implementation methods.

[0044] like Figure 1As shown, the present application provides a nuclear energy heating preheater heating steam condensate outlet temperature control system, including a first-level preheater A1, a first-level preheater B2, a first-level preheater C3, a first-level preheater D4, a heating steam condensate A-line inlet valve 5, a heating steam condensate A-line outlet valve 6, a first-level feed water inlet valve 7 of line A, a line A industrial steam outlet regulating valve 8, a line A industrial steam outlet stop valve 9, a heating steam condensate B-line inlet valve 10, a heating steam condensate B-line outlet valve 11, a first-level feed water inlet valve 12 of line B, a line B industrial steam outlet regulating valve 13, a line B industrial steam outlet stop valve 14, a heating steam condensate C-line inlet valve 15, a heating steam condensate C-line outlet valve 16, a line C first-level feed water Water inlet valve 17, C line industrial steam outlet regulating valve 18, C line industrial steam outlet stop valve 19, heating steam condensate D line inlet valve 20, heating steam condensate D line outlet valve 21, D line first-level water supply inlet valve 22, D line industrial steam outlet regulating valve 23, D line industrial steam outlet stop valve 24, heating steam condensate A line outlet thermometer 25, heating steam condensate A line outlet flowmeter 26, heating steam condensate B line outlet thermometer 27, heating steam condensate B line outlet flowmeter 28, heating steam condensate C line outlet thermometer 29, heating steam condensate C line outlet flowmeter 30, heating steam condensate D line outlet thermometer 31, heating steam condensate D line outlet flowmeter 32.

[0045] The first-stage preheater A1, the first-stage preheater B2, the first-stage preheater C3, and the first-stage preheater D4 are arranged in parallel, and they are connected to the industrial steam outlet regulating equipment (the industrial steam outlet regulating valve 8 of route A, the industrial steam outlet regulating valve 13 of route B, the industrial steam outlet regulating valve 18 of route C, and the industrial steam outlet regulating valve 23 of route D), the industrial steam outlet regulating equipment is connected to the deaerator, the deaerator is connected to the second-stage preheater, and the second-stage preheater is connected to the evaporator; they are also connected to the outlet valve equipment (the outlet valve 6 of route A for heating steam condensate, the outlet valve 11 of route B for heating steam condensate, the outlet valve 16 of route C for heating steam condensate, and the outlet valve 21 of route D for heating steam condensate).

[0046] The heating steam condensate A is introduced into the primary preheater A1 through the first pipeline, and a heating steam condensate A inlet valve 5 is provided on the first pipeline; the primary preheater A1 is connected to the condenser through the second pipeline, and a heating steam condensate A outlet valve 6, a heating steam condensate A outlet thermometer 25, and a heating steam condensate A outlet flowmeter 26 are provided on the second pipeline in sequence; the desalted water of the primary feed water is introduced into the primary preheater A1 through the third pipeline, and a primary feed water inlet valve 7 of A is provided on the third pipeline; the primary preheater A1 is connected to the deaerator through the fourth pipeline, and an A industrial steam outlet regulating valve 8 and an A industrial steam outlet stop valve 9 are provided on the fourth pipeline in sequence.

[0047] The heating steam condensate B is introduced into the primary preheater B2 through the fifth pipeline, and a heating steam condensate B inlet valve 10 is provided on the fifth pipeline; the primary preheater B2 is connected to the condenser through the sixth pipeline, and a heating steam condensate B outlet valve 11, a heating steam condensate B outlet thermometer 27, and a heating steam condensate B outlet flowmeter 28 are provided on the sixth pipeline in sequence; the desalted water of the primary feed water is introduced into the primary preheater B2 through the seventh pipeline, and a B-line primary feed water inlet valve 12 is provided on the seventh pipeline; the primary preheater B2 is connected to the deaerator through the eighth pipeline, and a B-line industrial steam outlet regulating valve 13 and a B-line industrial steam outlet stop valve 14 are provided on the eighth pipeline in sequence.

[0048] The heating steam condensate C is introduced into the primary preheater C3 through the ninth pipeline, and a heating steam condensate C circuit inlet valve 15 is provided on the ninth pipeline; the primary preheater C3 is connected to the condenser through the tenth pipeline, and a heating steam condensate C circuit outlet valve 16, a heating steam condensate C circuit outlet thermometer 29, and a heating steam condensate C circuit outlet flowmeter 30 are provided on the tenth pipeline in sequence; the desalted water of the primary feed water is introduced into the primary preheater C3 through the eleventh pipeline, and a C circuit primary feed water inlet valve 17 is provided on the eleventh pipeline; the primary preheater C3 is connected to the deaerator through the twelfth pipeline, and a C circuit industrial steam outlet regulating valve 18 and a C circuit industrial steam outlet stop valve 19 are provided on the twelfth pipeline in sequence.

[0049] The heating steam condensate D is introduced into the primary preheater D4 through the thirteenth pipeline, and a heating steam condensate D line inlet valve 20 is provided on the thirteenth pipeline; the primary preheater D4 is connected to the condenser through the fourteenth pipeline, and a heating steam condensate D line outlet valve 21, a heating steam condensate D line outlet thermometer 31, and a heating steam condensate D line outlet flowmeter 32 are provided on the fourteenth pipeline in sequence; the desalted water of the primary feed water is introduced into the primary preheater D4 through the fifteenth pipeline, and a D line primary feed water inlet valve 22 is provided on the fifteenth pipeline; the primary preheater D4 is connected to the deaerator through the sixteenth pipeline, and a D line industrial steam outlet regulating valve 23 and a D line industrial steam outlet stop valve 24 are provided on the sixteenth pipeline in sequence.

[0050] Optionally, the fourth pipeline, the eighth pipeline, the twelfth pipeline, and the sixteenth pipeline are connected to the same pipeline (the seventeenth pipeline), the seventeenth pipeline is connected to the deaerator, the deaerator is connected to the secondary preheater, and the secondary preheater is connected to the evaporator.

[0051] Optionally, the second pipeline, the sixth pipeline, the tenth pipeline, and the fourteenth pipeline are connected to the same pipeline (the eighteenth pipeline), and the eighteenth pipeline is connected to the condenser.

[0052] Taking the first-stage preheater A1 as an example, the energy supply of the preheater is to boost the pressure and preheat the feed water of the desalted water system and then send it into the deaerator, wherein the preheater tube side is the heating heat source, and the heating steam condensate A enters the preheater tube side through the heating steam condensate A line inlet valve 5, and after heating the feed water on the preheater shell side, it is discharged to the condenser through the heating steam condensate A line outlet valve 6, and a heating steam condensate A line outlet thermometer 25 and a heating steam condensate A line outlet flowmeter 26 are arranged between the heating steam condensate A line outlet valve 6 and the condenser, the heating steam condensate A line outlet thermometer 25 monitors the heating steam condensate A line outlet temperature, and the heating steam condensate A line outlet flowmeter 26 monitors the heating steam condensate A line outlet flowmeter 26 monitors the heating steam condensate A line outlet flow. The shell side of the preheater is the industrial steam side. The desalted water from the primary water supply enters the shell side of the preheater through the primary water supply inlet valve 7 of line A. After being heated by the heated steam condensate A on the preheater tube side, it passes through the industrial steam outlet regulating valve 8 of line A and the industrial steam outlet stop valve 9 of line A and is sent to the deaerator for deoxygenation, then enters the secondary preheater, and finally enters the evaporator to generate industrial steam.

[0053] Normally, nuclear energy heating preheaters are preheated in several groups in parallel. For example, in a nuclear energy industrial steam project, the first-level feed water enters four first-level preheaters through the header and then supplies water to the deaerator. Due to the different layout positions of the preheaters and the different lengths and numbers of elbows of the desalted water entering the preheater pipes, the pipe resistance is different, and the flow distribution on the feed water side of each preheater is uneven, resulting in a large temperature difference at the outlet of the preheater when the steam condensate heated by each preheater is heated. The outlet temperature of some condensate exceeds the design value, causing water hammer in the condensate header.

[0054] According to the cause of the condensate header water hammer, a regulating valve is added to the outlet of the feed water side of the first-stage preheater, and a flow meter and a thermometer are added to the outlet of the heating steam condensate on the heating side to display the condensate load. When the load changes, the feed water side flow is adjusted according to the outlet temperature of the heating side condensate, such as: if the outlet temperature of the heating steam condensate of the preheater increases, the feed water side flow is increased; if the outlet temperature of the heating steam condensate of the preheater decreases, the feed water side flow is reduced. Reduce the outlet temperature difference of the heating steam condensate after the four first-stage preheaters to avoid water hammer in the condensate header.

[0055] The above startup scheme can accurately control the outlet temperature of the heating steam condensate on the heating side of the nuclear energy heating preheater, thereby preventing the water hammer phenomenon caused by excessive temperature difference of the condensate outlet temperature on the heating side of multiple preheaters.

[0056] It should be noted that the first-stage preheater can be selected according to actual conditions, usually 4 sets.

[0057] like Figure 2 As shown, the present application also provides a method for controlling the outlet temperature of steam condensate heated by a nuclear energy heating preheater, comprising:

[0058] Step 1: Complete the water injection and flushing steps of the primary preheater, deaerator, secondary preheater and industrial side (shell side) of the evaporator according to the process flow. Step 1 is the prerequisite for steps 2 to 9.

[0059] Step 2: After the flushing water on the industrial side (shell side) of the primary preheater is qualified, open the A-way industrial steam outlet regulating valve 8 and the A-way industrial steam outlet stop valve 9 of the primary preheater A, and keep the industrial side (shell side) of the primary preheater full. Step 2 is the premise of Step 3 and Step 4.

[0060] Step 3: First, put the primary preheater A into operation, open the heating steam condensate A line inlet valve 5 (the heating steam condensate A line inlet valve on the primary preheater A tube side) and the heating steam condensate A line outlet valve 6, and start supplying heating steam condensate to heat the primary feed water on the preheater shell side.

[0061] Step 4: According to the drop in the liquid level in the evaporator downstream of the primary preheater, gradually open the primary water supply inlet valve of the primary preheater A (the primary water supply inlet valve 7 of line A, the primary water supply inlet valve on the shell side of the primary preheater A), and put the primary water supply into the industrial side (shell side) of the preheater.

[0062] Step 5: Put the primary preheater B into operation in the same way as steps 2 to 4.

[0063] Open the B-line industrial steam outlet regulating valve 13 and the B-line industrial steam outlet stop valve 14 of the first-stage preheater B, and keep the industrial side (shell side) of the first-stage preheater full.

[0064] Put the first-stage preheater B into operation, open the heating steam condensate B line inlet valve 10 and the heating steam condensate B line outlet valve 11, and start supplying heating steam condensate to heat the first-stage feed water on the shell side of the preheater.

[0065] According to the decrease in the liquid level in the evaporator downstream of the first-stage preheater, the first-stage feed water inlet valve 12 of the B line of the first-stage preheater B is gradually opened, and the first-stage feed water is put into supplying water to the industrial side (shell side) of the preheater.

[0066] Step 6: After the first-stage preheater A and the first-stage preheater B are fully operational, adjust the industrial steam outlet regulating equipment (A-line industrial steam outlet regulating valve 8, B-line industrial steam outlet regulating valve 13) of the first-stage preheater A and the first-stage preheater B according to the flow meter equipment (heating steam condensate A-line outlet flowmeter 26, heating steam condensate B-line outlet flowmeter 28) and the thermometer equipment (heating steam condensate A-line outlet thermometer 25, heating steam condensate B-line outlet thermometer 27) of the heating steam condensate A and the heating steam condensate B at the outlet of the first-stage preheater, and adjust the industrial steam outlet temperature deviation of the first-stage preheater A and the first-stage preheater B to no more than 2°C, so as to prevent the water hammer phenomenon caused by the large temperature deviation of the heating steam condensate of the two columns of the first-stage preheater A and B at the preheater outlet.

[0067] Step 7: Put the primary preheater C and primary preheater D into operation in the same way as step 3 and step 4, and adjust the industrial steam outlet temperatures of primary preheater A, primary preheater B, primary preheater C, and primary preheater D to within 2°C, to prevent the water hammer phenomenon caused by the large temperature deviation of the heating steam condensate at the preheater outlet of the four columns of primary preheater A, B, C, and D. The details are as follows:

[0068] Open the C-line industrial steam outlet regulating valve 18 and C-line industrial steam outlet stop valve 19 of the first-level preheater C, and keep the industrial side (shell side) of the first-level preheater full. Put the first-level preheater C into operation, open the C-line inlet valve 15 and the C-line outlet valve 16 of the heating steam condensate, and start supplying the heating steam condensate to heat the first-level feed water on the shell side of the preheater. According to the drop in the liquid level in the evaporator downstream of the first-level preheater, gradually open the C-line first-level feed water inlet valve 17 of the first-level preheater C, and put in the first-level feed water to supply water to the industrial side (shell side) of the preheater.

[0069] Open the D-line industrial steam outlet regulating valve 23 and the D-line industrial steam outlet stop valve 24 of the first-level preheater D, and keep the industrial side (shell side) of the first-level preheater full. Put the first-level preheater D into operation, open the D-line inlet valve 20 and the D-line outlet valve 21 of the heating steam condensate, and start supplying the heating steam condensate to heat the first-level feed water on the shell side of the preheater. According to the drop in the liquid level in the evaporator downstream of the first-level preheater, gradually open the D-line first-level feed water inlet valve 22 of the first-level preheater D, and put in the first-level feed water to supply water to the industrial side (shell side) of the preheater.

[0070] According to the flow meter equipment (heating steam condensate A outlet flow meter 26, heating steam condensate B outlet flow meter 28, heating steam condensate C outlet flow meter 30, heating steam condensate D outlet flow meter 32) and thermometer equipment (heating steam condensate A outlet thermometer 25, heating steam condensate B outlet thermometer 27, heating steam condensate C outlet thermometer 29, heating steam condensate D outlet thermometer 30) of heating steam condensate A, heating steam condensate B, heating steam condensate C and heating steam condensate D at the outlet of the first-stage preheater 1) Adjust the industrial steam outlet regulating equipment of primary preheater A, primary preheater B, primary preheater C and primary preheater D (industrial steam outlet regulating valve 8 of route A, industrial steam outlet regulating valve 13 of route B, industrial steam outlet regulating valve 18 of route C and industrial steam outlet regulating valve 23 of route D) to ensure that the industrial steam outlet temperatures of primary preheater A, primary preheater B, primary preheater C and primary preheater D do not deviate from each other by more than 2°C, so as to prevent the water hammer phenomenon caused by large temperature deviation of the heating steam condensate of the four columns of primary preheater A, B, C and D at the preheater outlet.

[0071] Step 8: When the load changes, if the outlet temperature of the heating steam condensate of a preheater (the outlet thermometer 25 of heating steam condensate A, the outlet thermometer 27 of heating steam condensate B, the outlet thermometer 29 of heating steam condensate C, the outlet thermometer 31 of heating steam condensate D) shows an increase, then slowly adjust the corresponding regulating valve equipment (the industrial steam outlet regulating valve 8 of A, the industrial steam outlet regulating valve 13 of B, the industrial steam outlet regulating valve 18 of C, the industrial steam outlet regulating valve 23 of D) to increase the flow on the water supply side, and observe the decrease in the corresponding outlet temperature of the heating steam condensate, and adjust it to the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C, and the first-stage preheater D. Then stop.

[0072] Step 9: When the load changes, if the heating steam condensate outlet temperature equipment of a certain preheater (heating steam condensate A outlet thermometer 25, heating steam condensate B outlet thermometer 27, heating steam condensate C outlet thermometer 29, heating steam condensate D outlet thermometer 31) shows a decrease, then slowly adjust the corresponding regulating valve equipment (A industrial steam outlet regulating valve 8, B industrial steam outlet regulating valve 13, C industrial steam outlet regulating valve 18, D industrial steam outlet regulating valve 23) to reduce the flow on the water supply side, and observe the increase in the corresponding heating steam condensate outlet temperature, and adjust it to the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C, and the first-stage preheater D. The temperature deviation is no more than 2°C.

[0073] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A nuclear energy heating preheater heating steam condensate outlet temperature control system, characterized in that: It comprises a group of primary preheaters arranged in parallel, one of the outlets of each group of the primary preheaters is connected to an industrial steam outlet regulating device, the industrial steam outlet regulating device is connected to a deaerator, the other outlet is connected to an outlet valve device, the outlet valve device is connected to a condenser; one of the inlets of each group of the primary preheaters is fed with heated steam condensate, and the other inlet is used for primary water supply.

2. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 1, characterized in that: An outlet thermometer and an outlet flow meter are provided on the pipeline leading from each group of the first-stage preheaters to the condenser.

3. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 1 or 2, characterized in that: The primary preheater comprises a primary preheater A (1), a primary preheater B (2), a primary preheater C (3) and a primary preheater D (4); the heated steam condensate A is introduced into the primary preheater A (1) through a first pipeline, the heated steam condensate B is introduced into the primary preheater B (2) through a fifth pipeline, the heated steam condensate C is introduced into the primary preheater C (3) through a ninth pipeline, and the heated steam condensate D is introduced into the primary preheater D (4) through a thirteenth pipeline.

4. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 3, characterized in that: The first pipeline is provided with a heating steam condensate A inlet valve (5), the fifth pipeline is provided with a heating steam condensate B inlet valve (10), the ninth pipeline is provided with a heating steam condensate C inlet valve (15), and the thirteenth pipeline is provided with a heating steam condensate D inlet valve (20).

5. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 3, characterized in that: The third pipeline is connected to the first-stage preheater A (1), and the third pipeline is provided with a first-stage water supply inlet valve (7) of route A; the seventh pipeline is connected to the first-stage preheater B (2), and the seventh pipeline is provided with a first-stage water supply inlet valve (12) of route B; the eleventh pipeline is connected to the first-stage preheater C (3), and the eleventh pipeline is provided with a first-stage water supply inlet valve (17) of route C; the fifteenth pipeline is connected to the first-stage preheater D (4), and the fifteenth pipeline is provided with a first-stage water supply inlet valve (22) of route D.

6. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 3, characterized in that: The second pipeline connects the first-stage preheater A (1) and the condenser, and the second pipeline is provided with a heating steam condensate A outlet valve (6), a heating steam condensate A outlet thermometer (25), and a heating steam condensate A outlet flowmeter (26) in sequence; the sixth pipeline connects the first-stage preheater B (2) and the condenser, and the sixth pipeline is provided with a heating steam condensate B outlet valve (11), a heating steam condensate B outlet thermometer (27), and a heating steam condensate B outlet flowmeter (28) in sequence; The tenth pipeline connects the first-stage preheater C (3) and the condenser, and the tenth pipeline is provided with a heating steam condensate C-way outlet valve (16), a heating steam condensate C-way outlet thermometer (29), and a heating steam condensate C-way outlet flowmeter (30) in sequence; the fourteenth pipeline connects the first-stage preheater D (4) and the condenser, and the fourteenth pipeline is provided with a heating steam condensate D-way outlet valve (21), a heating steam condensate D-way outlet thermometer (31), and a heating steam condensate D-way outlet flowmeter (32) in sequence.

7. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 3, characterized in that: The fourth pipeline connects the primary preheater A (1) and the deaerator, and the fourth pipeline is provided with an A-line industrial steam outlet regulating valve (8) and an A-line industrial steam outlet stop valve (9) in sequence; the eighth pipeline connects the primary preheater B (2) and the deaerator, and the eighth pipeline is provided with a B-line industrial steam outlet regulating valve (13) and a B-line industrial steam outlet stop valve (14) in sequence; the twelfth pipeline connects the primary preheater C (3) and the deaerator, and the twelfth pipeline is provided with a C-line industrial steam outlet regulating valve (18) and a C-line industrial steam outlet stop valve (19) in sequence; the sixteenth pipeline connects the primary preheater C (3) and the deaerator, and the sixteenth pipeline is provided with a D-line industrial steam outlet regulating valve (23) and a D-line industrial steam outlet stop valve (24) in sequence.

8. A method for controlling the outlet temperature of steam condensate from a nuclear energy heating preheater, characterized in that: include: Step 1: Complete the water injection and flushing steps of the primary preheater, deaerator, secondary preheater and evaporator industrial side according to the process flow; Step 2: Open the A-way industrial steam outlet regulating valve and A-way industrial steam outlet stop valve of the primary preheater A, and keep the industrial side of the primary preheater full; Step 3: Put the primary preheater A into operation, open the inlet valve of heating steam condensate A and the outlet valve of heating steam condensate A, and start supplying heating steam condensate to heat the primary feed water on the shell side of the preheater; Step 4: According to the drop in the liquid level in the evaporator downstream of the primary preheater, gradually open the primary water supply inlet valve of line A, and supply the primary water supply to the industrial side of the preheater; Step 5: Put the primary preheater B into operation; Step 6: After the primary preheater A and the primary preheater B are fully operational, adjust the industrial steam outlet regulating equipment of the primary preheater A and the primary preheater B according to the flow meter equipment and the thermometer equipment of the heating steam condensate A and the heating steam condensate B at the outlet of the primary preheater, and adjust the industrial steam outlet temperature deviation of the primary preheater A and the primary preheater B to not exceed 2°C; Step 7: Put the primary preheater C and the primary preheater D into operation, and adjust the industrial steam outlet temperatures of the primary preheater A, the primary preheater B, the primary preheater C, and the primary preheater D to a value within 2°C of each other; Step 8: When the load changes, if the outlet temperature of the heating steam condensate of a preheater is increased, slowly adjust the corresponding regulating valve device to increase the flow rate on the water supply side, and observe the decrease in the outlet temperature of the corresponding heating steam condensate, and adjust until the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C, and the first-stage preheater D deviate from each other by no more than 2°C, and then stop; Step 9: When the load changes, if the outlet temperature of the heating steam condensate of a preheater is lowered, slowly adjust the corresponding regulating valve to reduce the flow on the water supply side, and observe the increase in the outlet temperature of the heating steam condensate. Adjust the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C, and the first-stage preheater D to within 2°C of each other and stop.

9. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 8, characterized in that: Step 5 includes: Open the B-way industrial steam outlet regulating valve and B-way industrial steam outlet stop valve of the first-stage preheater B, and keep the industrial side of the first-stage preheater full; Put the primary preheater B into operation, open the heating steam condensate B inlet valve and the heating steam condensate B outlet valve, and start supplying heating steam condensate to heat the primary feed water on the shell side of the preheater; According to the decrease in the liquid level in the evaporator downstream of the first-stage preheater, the first-stage water supply inlet valve of line B of the first-stage preheater B is gradually opened, and the first-stage water supply is put into supplying water to the industrial side of the preheater.

10. The nuclear energy heating preheater heating steam condensate outlet temperature control system according to claim 8, characterized in that: Step 7 includes: Open the C-way industrial steam outlet regulating valve and C-way industrial steam outlet stop valve of the first-level preheater C, and keep the industrial side of the first-level preheater full; put the first-level preheater C into operation, open the C-way inlet valve and the C-way outlet valve of the heating steam condensate, and start supplying the heating steam condensate to heat the first-level feed water on the shell side of the preheater; according to the drop in the liquid level in the evaporator downstream of the first-level preheater, gradually open the C-way first-level feed water inlet valve 17, and put the first-level feed water into the industrial side of the preheater; Open the D-line industrial steam outlet regulating valve and D-line industrial steam outlet stop valve of the first-level preheater D, and keep the industrial side of the first-level preheater full; put the first-level preheater D into operation, open the D-line inlet valve and the D-line outlet valve of the heating steam condensate, and start supplying the heating steam condensate to heat the first-level feed water on the shell side of the preheater; according to the drop in the liquid level in the evaporator downstream of the first-level preheater, gradually open the D-line first-level feed water inlet valve, and put the first-level feed water into the industrial side of the preheater; Adjust the industrial steam outlet regulating equipment of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C and the first-stage preheater D according to the flow meter equipment and the thermometer equipment of the heating steam condensate A, the heating steam condensate B, the heating steam condensate C and the heating steam condensate D at the outlet of the first-stage preheater, and adjust the industrial steam outlet temperatures of the first-stage preheater A, the first-stage preheater B, the first-stage preheater C and the first-stage preheater D to within 2°C of each other.

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