High-temperature gas cooled reactor steam generator backwashing device, nuclear power system and use method

Abstract

The invention relates to the technical field of high-temperature gas cooled reactor steam generator backwashing, in particular to a high-temperature gas cooled reactor steam generator backwashing device, a nuclear power system and a use method. A high-temperature gas cooled reactor steam generator backwashing device comprises a gas-liquid isolation assembly which comprises a communication pipeline and a first isolation valve, the communication pipeline is suitable for being communicated with a feed water input pipeline and a steam output pipeline, and the steam output pipeline is suitable for being connected with the output end of a steam generator; the water supply input pipeline is suitable for being connected with the access end of the steam generator, a first control valve is suitable for being arranged on the water supply input pipeline, fluid flows in the water supply input pipeline, the communicating position of the communicating pipeline and the water supply input pipeline is located on the upstream of the first control valve, and the communicating pipeline is provided with a first isolation valve. The invention provides a high-temperature gas cooled reactor steam generator backwashing device, a nuclear power system and a use method, and aims to solve the problem that in a dynamic working condition, liquid water and high-temperature steam act on a certain position at the same time, so that materials are damaged, and device safety is affected.

Description

Technical Field

[0001] The present invention relates to the technical field of backwashing of a high-temperature gas-cooled reactor steam generator, and in particular to a backwashing device of a high-temperature gas-cooled reactor steam generator, a nuclear power system and a use method thereof. Background Art

[0002] As a new type of reactor with the characteristics of fourth-generation nuclear power, the high-temperature gas-cooled reactor nuclear power plant has a steam generator as the core device for extracting heat from the nuclear reaction, and its structure is precise and complex.

[0003] The main steam generator of the high-temperature gas-cooled reactor adopts direct current heat exchange. Multiple sets of heat exchange units are installed inside the steam generator. The heat exchange unit consists of a throttling component and a heat exchange component. The liquid water in the heat exchange component is directly heated to superheated steam, and the superheated steam drives the steam turbine generator to do work.

[0004] In order to effectively control the flow distribution between each heat exchange unit, throttling components of different specifications are set at the inlet of the heat exchange unit at different positions. The throttling components effectively limit and distribute the flow, so as to achieve consistent steam quality generated by each heat exchange unit after heating.

[0005] However, due to the small size of the throttling component, some foreign matter may be retained in the throttling component, affecting the heat exchange effect of the heat exchange unit. Therefore, a device is needed to clean the foreign matter retained in the throttling component.

[0006] However, since the temperature of liquid water is usually relatively low, while the temperature of steam at the steam generator outlet is relatively high, the temperature difference can reach the order of 400°C. Simple valve isolation can cause serious damage to materials and valve structure life. Especially in dynamic conditions where parameters change repeatedly, liquid water and high-temperature steam acting on a certain point at the same time can easily cause material fatigue damage, affecting the safety of the unit. Summary of the Invention

[0007] In view of this, the present invention provides a high-temperature gas-cooled reactor steam generator backwash device, a nuclear power system and a method of use to solve the problem that in dynamic working conditions where parameters repeatedly change, liquid water and high-temperature steam act simultaneously on a certain point, which can easily cause material fatigue damage and affect the safety of the device.

[0008] In a first aspect, the present invention provides a backwash device for a high-temperature gas-cooled reactor steam generator, comprising:

[0009] A gas-liquid isolation component, the gas-liquid isolation component includes a connecting pipe and a first isolation valve, the connecting pipe is respectively suitable for connecting with the water supply input pipe and the steam output pipe, the steam output pipe is suitable for connecting with the output end of the steam generator, the water supply input pipe is suitable for connecting with the access end of the steam generator, the water supply input pipe is suitable for being provided with a first control valve, the water supply input pipe is suitable for flowing fluid, the connection point between the connecting pipe and the water supply input pipe is located upstream of the first control valve, and the connecting pipe is provided with a first isolation valve.

[0010] In the first state, the steam generator converts liquid into gas and enters the steam delivery pipeline; in the second state, when the steam generator reduces the parameters, due to the setting of the connecting pipeline, the liquid fluid enters the steam output pipeline, thereby inputting the liquid fluid into the steam output pipeline, avoiding the liquid fluid and gaseous fluid acting on the steam output pipeline at the same time, and ensuring the safety of the entire device.

[0011] In an optional embodiment, the gas-liquid isolation assembly also includes a partition box and a second isolation valve, and the connecting pipe includes a first connecting branch and a second connecting branch, one end of the first connecting branch is connected to the water input pipe, and the other end is connected to the partition box, and a first isolation valve is provided on the first connecting branch, one end of the second connecting branch is connected to the steam output pipe, and the other end is connected to the partition box, and a second isolation valve is provided on the second connecting branch.

[0012] In an optional embodiment, the gas-liquid isolation assembly further includes a drain valve, a drain pipe and a first container, wherein the drain pipe is arranged at the bottom of the partition box, a drain valve is provided on the drain pipe, and the other end of the drain pipe away from the partition box extends into the first container.

[0013] In an optional embodiment, the gas-liquid isolation assembly also includes an air intake pipe, an air intake valve, a safety pipe and a safety valve. The air intake pipe is connected to the side wall of the isolation box, the air intake pipe is provided with an air intake valve, the safety pipe is provided at the top of the isolation box, and the safety pipe is provided with a safety valve.

[0014] In an optional embodiment, at least two heat exchange elements are provided in the steam generator, and a throttling element is provided at the inlet end of each heat exchange element. Each throttling element is connected to the water input pipe through an inlet branch pipe, and the output end of each heat exchange element is connected to the steam output pipe through an output branch pipe.

[0015] In an optional embodiment, it further includes a water supply input component, which includes a water supply input pipe and a first control valve. The water supply input component also includes a power pump and a second control valve. The water supply input pipe is provided with a power pump, a second control valve and a first control valve in sequence from upstream to downstream. The connection point between the connecting pipe and the water supply input pipe is located between the first control valve and the second control valve.

[0016] In an optional embodiment, a steam output component is further included, the steam output component includes a steam output pipe, the steam output component also includes a third control valve, the steam output pipe is provided with a third control valve, and the connection between the connecting pipe and the steam output pipe is located upstream of the third control valve.

[0017] In an optional embodiment, the water supply input component also includes a sewage pipe, a sewage valve and a second container. The sewage pipe is connected to the water supply input pipe, and a sewage valve is provided on the sewage pipe. The sewage pipe extends into the second container at one end away from the water supply input pipe.

[0018] In a second aspect, the present invention further provides a nuclear power system comprising the above-mentioned high-temperature gas-cooled reactor steam generator backwashing device.

[0019] In a third aspect, the present invention also provides a method for using a backwash device for a high-temperature gas-cooled reactor steam generator. In a first state, the first control valve is opened and the first isolation valve is closed, and the steam generator changes the fluid in the water feed input pipe from liquid to gas and outputs it through the steam output pipe; in a second state, the first control valve is closed and the first isolation valve is opened, and the steam generator reduces operating parameters, so that the steam output pipe outputs liquid fluid, and the fluid in the water feed input pipe flows into the steam input pipe through the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of a backwash device for a high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention.

[0022] Explanation of the accompanying drawings: 1. Water input assembly; 101. Water input pipeline; 102. First control valve; 103. Power pump; 104. Second control valve; 105. Drain valve; 106. Second container; 107. Drain pipeline; 2. Steam output assembly; 201. Steam output pipeline; 202. Third control valve; 3. Steam generator; 301. Heat exchange element; 302. Throttle element; 303. Inlet branch; 304. Output branch; 4. Gas-liquid isolation assembly; 401. First isolation valve; 402. First connecting branch; 403. Second connecting branch; 404. Second isolation valve; 405. Spacer box; 406. Drain pipeline; 407. Drain valve; 408. First container; 409. Air intake pipeline; 410. Air intake valve; 411. Safety pipeline; 412. Safety valve. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0024] The following combination Figure 1 , describing embodiments of the present invention.

[0025] According to an embodiment of the present invention, on the one hand, a backwash device for a high-temperature gas-cooled reactor steam generator is provided, comprising: a gas-liquid isolation component 4, the gas-liquid isolation component 4 comprising a connecting pipe and a first isolation valve 401, the connecting pipe being suitable for connecting with a water supply input pipe 101 and a steam output pipe 201 respectively, the steam output pipe 201 being suitable for connecting with the output end of the steam generator 3, the water supply input pipe 101 being suitable for connecting with the access end of the steam generator 3, the water supply input pipe 101 being suitable for being provided with a first control valve 102, the water supply input pipe 101 being suitable for having fluid flowing therein, the connection point between the connecting pipe and the water supply input pipe 101 being located upstream of the first control valve 102, and the connecting pipe being provided with a first isolation valve 401.

[0026] In the first state, the steam generator 3 converts the liquid into gas and enters the steam delivery pipe; in the second state, when the steam generator 3 reduces the parameters, due to the setting of the connecting pipe, the liquid fluid enters the steam output pipe 201, thereby inputting the liquid fluid into the steam output pipe 201, avoiding the liquid fluid and gaseous fluid acting on the steam output pipe 201 at the same time, and ensuring the safety of the entire device.

[0027] In this embodiment, the fluid is liquid water or water vapor; that is, the fluid in the water supply input pipe 101 is liquid water. In this embodiment, "upstream" refers to the location where the fluid first flows through. For example, "the connection between the connecting pipe and the water supply input pipe 101 is located upstream of the first control valve 102" means that the fluid first flows through the connection between the connecting pipe and the water supply input pipe 101 before flowing through the first control valve 102. In this embodiment, the first state refers to the normal operating state of the steam generator 3, and the second state refers to the backwashing state of the steam generator 3.

[0028] In one embodiment, Figure 1 As shown, the gas-liquid isolation assembly 4 also includes a spacer box 405 and a second isolation valve 404. The connecting pipeline includes a first connecting branch 402 and a second connecting branch 403. One end of the first connecting branch 402 is connected to the water supply input pipeline 101 and the other end is connected to the spacer box 405. The first connecting branch 402 is equipped with a first isolation valve 401. The second connecting branch 403 is connected to the steam output pipeline 201 at one end and the other end is connected to the spacer box 405. The second connecting branch 403 is equipped with a second isolation valve 404. The fluid in the water supply input pipeline 101 enters the spacer box 405 through the first connecting branch 402, and then enters the steam output pipeline 201 through the spacer box 405 through the second connecting branch 403. The first isolation valve 401 controls the opening and closing of the first connecting branch 402, and the second isolation valve 404 controls the opening and closing of the second connecting branch 403.

[0029] In one embodiment, Figure 1 As shown, the gas-liquid isolation assembly 4 further includes a drain valve 407, a drain pipe 406, and a first container 408. The drain pipe 406 is disposed at the bottom of the compartment box 405. The drain valve 407 is disposed on the drain pipe 406. The other end of the drain pipe 406, facing away from the compartment box 405, extends into the first container 408. The liquid fluid in the compartment box 405 is drained into the first container 408 through the drain pipe 406 to relieve the pressure of the compartment box 405. The drain valve 407 controls the opening and closing of the drain pipe 406.

[0030] In one embodiment, Figure 1As shown, the gas-liquid isolation assembly 4 also includes an air intake pipe 409, an air intake valve 410, a safety pipe 411, and a safety valve 412. The air intake pipe 409 is connected to the side wall of the isolation box and is equipped with an air intake valve 410. The safety pipe 411 is located at the top of the isolation box and is equipped with a safety valve 412. The air intake valve 410 controls the opening and closing of the air intake pipe 409. When the drain pipe 406 is draining, the air intake valve 410 is simultaneously opened to achieve pressure balance within the isolation box. The safety valve 412 controls the opening and closing of the safety pipe 411. The safety pipe 411 serves as a "backup," replacing the function of the air intake pipe 409 if it fails to function properly.

[0031] In one embodiment, Figure 1 As shown, the steam generator 3 is equipped with at least two heat exchangers 301. Each heat exchanger 301 has a throttle element 302 at its inlet end. Each throttle element 302 is connected to the feedwater input pipe 101 via an inlet branch pipe 303. The output end of each heat exchanger 301 is connected to the steam output pipe 201 via an output branch pipe 304. Specifically, the throttle element 302 is a Y-shaped filter with a flushing function. The throttle element 302 filters the liquid fluid entering the heat exchanger 301 through the inlet branch pipe 303 to prevent impurities in the fluid from entering the heat exchanger 301. In this embodiment, there are five heat exchangers 301 and five throttle elements 302.

[0032] In one embodiment, Figure 1 As shown, the water supply input assembly 1 also includes a water supply input pipe 101 and a first control valve 102. The water supply input assembly 1 also includes a power pump 103 and a second control valve 104. The water supply input pipe 101 is provided with the power pump 103, the second control valve 104 and the first control valve 102 in sequence from upstream to downstream. The connection point between the communication pipe and the water supply input pipe 101 is located between the first control valve 102 and the second control valve 104. The opening and closing of the entire water supply input pipe 101 are controlled by the second control valve 104. When the first control valve 102 and the second control valve 104 are both open and the first isolation valve 401 is closed, the liquid fluid flows into the steam generator 3; when the second control valve 104 and the first isolation valve 401 are open and the first control valve 102 is closed, the liquid fluid flows into the first communication branch 402.

[0033] In one embodiment, Figure 1As shown, the device further includes a steam output assembly 2, which includes a steam output pipe 201 and a third control valve 202. The third control valve 202 is provided on the steam output pipe 201, and the connection between the communication pipe and the steam output pipe 201 is located upstream of the third control valve 202. The third control valve 202 controls the opening and closing of the steam output pipe 201.

[0034] In one embodiment, Figure 1 As shown, the feedwater input assembly 1 further includes a drain pipe 107, a drain valve 105, and a second container 106. The drain pipe 107 is connected to the feedwater input pipe 101 and is provided with a drain valve 105. The end of the drain pipe 107 facing away from the feedwater input pipe 101 extends into the second container 106. The drain pipe 107 is configured to flush impurities from the throttle member 302 in the steam generator 3 into the second container 106 via the drain pipe 107. It should be noted that in this embodiment, the first control valve 102, the second control valve 104, the third control valve 202, the first isolation valve 401, the second isolation valve 404, the air inlet valve 410, the safety valve 412, the drain valve 407, and the drain valve 105 are all solenoid-controlled valves.

[0035] A nuclear power system includes the above-mentioned backwash device for the high-temperature gas-cooled reactor steam generator 3, and also includes a controller, which is respectively connected to the first control valve 102, the second control valve 104, the third control valve 202, the first isolation valve 401, the second isolation valve 404, the air intake valve 410, the safety valve 412, the power pump 103, the drain valve 407 and the sewage valve 105.

[0036] A method for using a backwash device for a high-temperature gas-cooled reactor steam generator 3 comprises the following steps:

[0037] (1) In the first state, the first control valve 102, the second control valve 104 and the third control valve 202 are open, the first isolation valve 401, the second isolation valve 404, the air inlet valve 410, the safety valve 412, the drain valve 407 and the sewage valve 105 are closed, and the power pump 103 drives the liquid fluid into the steam generator 3 through the water supply input pipe 101, and the steam generator 3 converts the fluid from liquid to gas. When the throttle element 302 shows signs of blockage and needs to be backwashed in the second state, the steam output pipe 201 is converted from gas to liquid by reducing the operating parameters of the steam generator 3;

[0038] (2) Keep the power pump 103 running, close the first control valve 102, keep the air inlet valve 410, the safety valve 412, the drain valve 407, and the sewage valve 105 closed, and open the second control valve 104, the third control valve 202, the first isolation valve 401, and the second isolation valve 404, so that the liquid fluid flows through the first connecting branch 402, the spacer box 405, and the second connecting branch 403 to reach the steam output pipe 201 and then flow out;

[0039] (3) Keep the power pump 103 running, the first control valve 102, the air inlet valve 410, the safety valve 412 and the drain valve 407 closed, the second control valve 104, the third control valve 202, the first isolation valve 401 and the second isolation valve 404 open, and open the drain valve 105 to achieve reverse flow of the fluid in the heat exchange element 301 in the steam generator 3, flushing out foreign matter trapped in the throttling element 302, allowing the foreign matter to flow into the water supply input pipe 101 through the inlet branch pipe 303, and then be discharged into the second container 106 through the drain pipe 107;

[0040] (4) After backwashing is completed, the drain valve 105 is closed, the first control valve 102 is opened, the second control valve 104, the third control valve 202, the first isolation valve 401, and the second isolation valve 404 remain open, and the drain valve 407, the air inlet valve 410, and the safety valve 412 remain closed, so that the liquid fluid enters the steam generator 3;

[0041] (5) Close the first isolation valve 401 and the second isolation valve 404, keep the first control valve 102, the second control valve 104 and the third control valve 202 open, keep the drain valve 105 and the safety valve 412 closed, open the air inlet valve 410 and the drain valve 407, relieve the pressure of the compartment box 405, and drain the liquid fluid in the compartment box 405. Let air into the air inlet valve 410 to ensure that the fluid in the compartment box 405 is completely drained;

[0042] (6) The steam generator 3 increases the operating parameters to change the liquid into gas, and the gaseous fluid is output from the steam output pipe 201. During the parameter increase process, the first isolation valve 401 and the air inlet valve 410 are closed, and the sewage valve 105 remains closed. The second isolation valve 404 is opened, and the drain valve 407 is kept open. The gaseous fluid partially enters the partition box 405 until steam appears in the first container 408, proving that the partition box 405 has been emptied, and then the first isolation valve 401 is closed.

[0043] The backwashing device for the high-temperature gas-cooled reactor steam generator 3 provided by the present invention has the following advantages: (1) the liquid fluid is input into the steam output pipe 201, thereby preventing the liquid fluid and the gaseous fluid from acting on the steam output pipe 201 at the same time, thereby ensuring the safety of the entire device; (2) by providing a spacer box 405, the liquid fluid is buffered, thereby preventing the fluid from directly impacting the steam output pipe 201; and (3) the throttling element 302 is cleaned by backwashing.

[0044] As an alternative embodiment, the number of heat exchange elements 301 can be 2, 3, 4, 6 or even more, and the number of throttling elements 302 can be 2, 3, 4, 6 or even more.

[0045] As an alternative embodiment, the outflowing fluid in step (2) "the liquid fluid flows out after reaching the steam output pipe 201 through the first connecting branch 402, the partition box 405 and the second connecting branch 403" can be supplied to the power pump 103 through the circulation loop.

[0046] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A backwash device for a high temperature gas-cooled reactor steam generator, characterized in that: include: A gas-liquid isolation assembly (4) comprising a connecting pipe and a first isolation valve (401), wherein the connecting pipe is adapted to be connected to a water supply input pipe (101) and a steam output pipe (201), respectively; the steam output pipe (201) is adapted to be connected to the output end of a steam generator (3); the water supply input pipe (101) is adapted to be connected to the access end of the steam generator (3); a first control valve (102) is adapted to be provided on the water supply input pipe (101); a fluid is adapted to flow in the water supply input pipe (101); a connection point between the connecting pipe and the water supply input pipe (101) is located upstream of the first control valve (102); and a first isolation valve (401) is provided on the connecting pipe.

2. The backwash device for a high temperature gas-cooled reactor steam generator according to claim 1, characterized in that: The gas-liquid isolation assembly (4) further comprises a spacer box (405) and a second isolation valve (404); the communication pipeline comprises a first communication branch (402) and a second communication branch (403); one end of the first communication branch (402) is connected to the water supply input pipeline (101), and the other end is connected to the spacer box (405); the first communication branch (402) is provided with a first isolation valve (401); one end of the second communication branch (403) is connected to the steam output pipeline (201), and the other end is connected to the spacer box (405); the second communication branch (403) is provided with a second isolation valve (404).

3. The backwashing device for a high temperature gas-cooled reactor steam generator according to claim 2, characterized in that: The gas-liquid isolation assembly (4) further comprises a drain valve (407), a drain pipe (406) and a first container (408). The drain pipe (406) is arranged at the bottom of the spacer box (405). The drain pipe (406) is provided with a drain valve (407). The other end of the drain pipe (406) facing away from the spacer box (405) extends into the first container (408).

4. The backwashing device for a high temperature gas-cooled reactor steam generator according to claim 3, characterized in that: The gas-liquid isolation assembly (4) further comprises an air intake pipe (409), an air intake valve (410), a safety pipe (411) and a safety valve (412); the air intake pipe (409) is connected to the side wall of the isolation box; the air intake valve (410) is provided on the air intake pipe (409); the safety pipe (411) is arranged on the top of the isolation box; and the safety valve (412) is provided on the safety pipe (411).

5. The backwashing device for a high temperature gas-cooled reactor steam generator according to claim 1, characterized in that: At least two heat exchange elements (301) are provided in the steam generator (3), and a throttling element (302) is provided at the inlet end of each heat exchange element (301). Each throttling element (302) is connected to the water supply input pipe (101) through an inlet branch pipe (303), and the output end of each heat exchange element (301) is connected to the steam output pipe (201) through an output branch pipe (304).

6. The backwash device for a high temperature gas-cooled reactor steam generator according to claim 5, characterized in that: The invention also comprises a water supply input assembly (1), the water supply input assembly (1) comprising a water supply input pipe (101) and a first control valve (102), the water supply input assembly (1) further comprising a power pump (103) and a second control valve (104), the water supply input pipe (101) being provided with the power pump (103), the second control valve (104) and the first control valve (102) in sequence from upstream to downstream, and the connection point between the connecting pipe and the water supply input pipe (101) is located between the first control valve (102) and the second control valve (104).

7. The backwashing device for a high temperature gas-cooled reactor steam generator according to claim 6, characterized in that: The invention also comprises a steam output component (2), the steam output component (2) comprising a steam output pipe (201), the steam output component (2) further comprising a third control valve (202), the steam output pipe (201) being provided with the third control valve (202), and the connection point between the communicating pipe and the steam output pipe (201) being located upstream of the third control valve (202).

8. The backwashing device for a high temperature gas-cooled reactor steam generator according to claim 7, characterized in that: The water supply input assembly (1) further comprises a sewage discharge pipe (107), a sewage discharge valve (105) and a second container (106); the sewage discharge pipe (107) is in communication with the water supply input pipe (101); a sewage discharge valve (105) is provided on the sewage discharge pipe (107); and one end of the sewage discharge pipe (107) facing away from the water supply input pipe (101) extends into the second container (106).

9. A nuclear power system, characterized in that: The invention comprises the backwashing device for a high temperature gas-cooled reactor steam generator according to any one of claims 1 to 8.

10. A method for using a backwashing device for a high-temperature gas-cooled reactor steam generator, for using the backwashing device for a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that: In a first state, the first control valve (102) is opened and the first isolation valve (401) is closed, and the steam generator (3) changes the fluid in the water supply input pipe (101) from liquid to gaseous and outputs it through the steam output pipe (201); in a second state, the first control valve (102) is closed and the first isolation valve (401) is opened, and the steam generator (3) reduces the operating parameters, so that the steam output pipe (201) outputs liquid fluid, and the fluid in the water supply input pipe (101) flows into the steam input pipe through the connecting pipe.

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