阅读说明：本技术 地下核电站多级往复式非能动冷却系统 (Multistage reciprocating passive cooling system of underground nuclear power station ) 是由 钮新强 张涛 喻飞 苏毅 金乾 张顺 陈玉梅 李成子 邹尤 吴超 于 2019-09-06 设计创作，主要内容包括：本发明涉及地下核电站技术领域,公开了一种地下核电站多级往复式非能动冷却系统,包括位于山体内的地下热源,还包括位于山体外N个不同高程的冷却水池,每个冷却水池均通过注入管与地下热源相连,沿山体由上至下,第一个、第三个…第N个冷却水池与地下热源相连的注入管上均设有控制阀。本发明地下核电站多级往复式非能动冷却系统,大幅延长非能动冷却系统的有效运行时间,提高安全性。(The invention relates to the technical field of underground nuclear power stations, and discloses a multistage reciprocating passive cooling system of an underground nuclear power station, which comprises an underground heat source positioned in a mountain body and N cooling water pools positioned outside the mountain body and having different elevations, wherein each cooling water pool is connected with the underground heat source through an injection pipe, and control valves are arranged on the injection pipes, which are connected with the underground heat source, of the first and third … Nth cooling water pools from top to bottom along the mountain body. The multistage reciprocating passive cooling system of the underground nuclear power station greatly prolongs the effective operation time of the passive cooling system and improves the safety.)

1. The utility model provides an underground nuclear power station multistage reciprocating type passive cooling system, includes underground heat source (2) that are located massif (1), its characterized in that: still including being located the cooling water pond of a plurality of different elevations outside mountain body (1), every the cooling water pond all through the injection pipe with underground heat source (2) link to each other, follow mountain body (1) is from top to bottom, and first, third … Nth the cooling water pond with all be equipped with the control valve on the injection pipe that underground heat source (2) link to each other.

2. The multistage reciprocating passive cooling system of an underground nuclear power plant according to claim 1, characterized in that: follow mountain (1) from top to bottom, from the third cooling water pool begins, and the injection pipe that the cooling water pool of odd number is connected all with the first the injection pipe intercommunication that the cooling water pool is connected, from the fourth the cooling water pool begins, and the cooling water pool of even number position is connected the injection pipe all with the second the injection pipe intercommunication that the cooling water pool is connected, the aforesaid the elevation of the intercommunication position of injection pipe reduces in proper order and all is less than with the elevation of the cooling water pool of injection pipe intercommunication.

3. The multistage reciprocating passive cooling system of an underground nuclear power plant as claimed in claim 2, wherein: follow mountain body (1) from top to bottom, the first control valve on the injection pipe that cooling water pond connects is located on all intercommunication points.

4. The multistage reciprocating passive cooling system of an underground nuclear power plant according to claim 1, characterized in that: follow mountain body (1) from top to bottom, adjacent two the difference in elevation between the cooling water pool decreases progressively in proper order.

5. The multistage reciprocating passive cooling system of an underground nuclear power plant according to claim 1, characterized in that: the minimum height difference between two adjacent cooling water pools is not less than 10 meters.

Technical Field

The invention relates to the technical field of underground nuclear power stations, in particular to a multistage reciprocating passive cooling system of an underground nuclear power station.

Background

The underground nuclear power station places nuclear plants such as a nuclear island and the like underground, utilizes the protection and containment functions of underground rock masses to limit the release of potential radioactive substances to the environment, improves the safety of the nuclear power station, and provides a new idea for the development of nuclear power safety in China.

The design of the passive cooling system is a great outstanding advantage of the third-generation nuclear power, the system is simple in design, does not need complex external energy driving, is high in reliability, and saves much equipment investment compared with an energy-saving system, so that the system gradually becomes an advanced design concept of future nuclear power development. However, due to the constraint of the arrangement conditions of the ground power station, the operation time of the ground power station passive cooling system is generally limited by the amount of cooling water, and the unstable containment arrangement is caused when the amount of cooling water is too large, so that the operation time of the passive cooling system in the prior art is not long.

The Chinese invention patent application (published: 11/05/2014 and publication number: CN104134474A) discloses a passive cooling system, which utilizes a condensate water pool arranged outside a containment to be a final heat sink to lead out heat in the containment, but the water pool needs to be higher than the containment by a certain height and has limited capacity and short system input operation time.

The Chinese invention patent application (published: 2014: 01/22/publication number: CN103531256A) discloses a passive cooling system for a prestressed concrete containment of a pressurized water reactor, wherein a water storage tank is arranged at the top of the containment, the containment is cooled by water in the water tank, and although the concrete containment replaces a steel containment to support a larger cooling water tank, the scheme also has the problems of small cooling water amount and short system operation time.

Disclosure of Invention

The invention aims to provide a multistage reciprocating passive cooling system of an underground nuclear power station aiming at the defects of the technology, so that the effective operation time of the passive cooling system is greatly prolonged, and the safety is improved.

In order to achieve the purpose, the multistage reciprocating passive cooling system of the underground nuclear power station, which is designed by the invention, comprises an underground heat source positioned in a mountain body, and is characterized in that: still including being located the cooling water pond of the outer N different elevations of mountain body, every the cooling water pond all through the injection tube with underground heat source links to each other, follows the mountain body is from top to bottom, and first, third … Nth the cooling water pond with all be equipped with the control valve on the injection tube that underground heat source links to each other.

Preferably, along the mountain body from top to bottom, from the third cooling water tank, the filling pipe that odd number position cooling water tank is connected all with the first filling pipe that cooling water tank is connected intercommunication, from the fourth cooling water tank, even number position cooling water tank is connected the filling pipe all with the second filling pipe that cooling water tank is connected intercommunication, the aforesaid the elevation of the intercommunication position of filling pipe reduces in proper order and all is less than with the elevation of the cooling water tank of filling pipe intercommunication, through the intercommunication between the filling pipe, has reduced engineering cost by a wide margin.

Preferably, follow the mountain body is from top to bottom, and is first the control valve on the injection pipe that the cooling water pond is connected is located all intercommunication points, and convenient control is right the independent control of injection pipe switching.

Preferably, along the mountain body from top to bottom, adjacent two the difference in elevation between the cooling water pond diminishes in proper order, prolongs the cooling duration of cooling water as far as possible.

Preferably, the minimum height difference between two adjacent cooling water pools is not less than 10 m so as to maintain sufficient injection pressure.

Compared with the prior art, the invention has the following advantages:

1. By utilizing the arrangement characteristics of the underground nuclear power station, the multistage cooling water tanks are arranged at different elevations of a mountain, the passive cooling system is pushed to operate through the elevation difference between the cooling water tanks, and cooling water is enabled to reciprocate among the cooling water tanks, so that the effective operation time of the passive cooling system is greatly prolonged, the cooling time is prolonged by at least 3 times under the condition of the same cooling water amount, and the safety is improved;

2. the whole system can be passively operated, does not need to be pushed by external energy, and is simple and reliable;

3. Through the communication between the injection pipes, the engineering cost is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the multistage reciprocating passive cooling system of the underground nuclear power plant.

The components in the figures are numbered as follows:

The mountain 1, the underground heat source 2, the first cooling water pool 31, the second cooling water pool 32, the third cooling water pool 33, the fourth cooling water pool 34, the first injection pipe 41, the second injection pipe 42, the third injection pipe 43, the fourth injection pipe 44, the first control valve 51, the third control valve 53 and the fourth control valve 54.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

The invention relates to a multistage reciprocating passive cooling system of an underground nuclear power station, which comprises an underground heat source 2 positioned in a mountain 1 and N cooling water pools positioned outside the mountain 1 and having different elevations, wherein each cooling water pool is connected with the underground heat source 2 through an injection pipe, the injection pipes connected with the first … Nth cooling water pool and the underground heat source 2 are respectively provided with a control valve from top to bottom along the mountain 1, the elevation difference between two adjacent cooling water pools is gradually reduced from top to bottom along the mountain 1, and the minimum elevation difference between the two adjacent cooling water pools is not less than 10 meters.

In the embodiment, the underground heat source 2 is a potential heat source of the underground nuclear power station, such as a containment vessel of the underground nuclear power station, a secondary side of a steam generator, a heat trap of a waste heat discharge system, and the like.

When the underground heat source 2 is required to be cooled, the control valve on the injection pipe connected with the first cooling water pool is opened, under the neutral action, cooling water in the first cooling water pool flows into the underground heat source 2 along the injection pipe, the temperature of the cooling water rises after the heat exchange of the cooling water at the underground heat source 2 is completed, due to the action of the high-potential difference pressure difference between the first cooling water pool and the second cooling water pool, the cooling water in the first cooling water pool can continuously flow into the underground heat source 2 through the injection pipe connected with the first cooling water pool, then flow into the second cooling water pool through the injection pipe connected with the second cooling water pool, and in the process, the heat in the underground heat source 2 is continuously taken out of the ground.

After the water pressure in the first cooling water pool and the second cooling water pool is balanced, a control valve on an injection pipe connected with the third cooling water pool is opened, and similarly, the cooling water enters the underground heat source 2 through the injection pipe connected with the second cooling water pool under the action of the high-potential difference pressure difference between the second cooling water pool and the third cooling water pool and then flows to the third cooling water pool through the injection pipe connected with the third cooling water pool, and in the process, the heat in the underground heat source 2 is continuously taken out of the ground.

By parity of reasoning, through constantly opening the control valve on the injection pipe connected with the subsequent cooling water pool, cooling water can get into next cooling water pool from the last cooling water pool after passing through the underground heat source 2, continuously takes the heat in the underground heat source 2 out of the ground, and makes the cooling water reciprocate between a plurality of cooling water pools, thereby greatly prolonging the effective operation time of the passive cooling system.

In another embodiment, as shown in fig. 1, the multistage reciprocating passive cooling system of the underground nuclear power plant comprises an underground heat source 2 positioned in a mountain 1, and further comprises four cooling water pools positioned at four different elevations outside the mountain 1, namely a first-stage cooling water tank 31, a second-stage cooling water tank 32, a third-stage cooling water tank 33 and a fourth-stage cooling water tank 34 from top to bottom along the mountain body 1, and the elevation difference between two adjacent cooling water pools is gradually decreased, the minimum elevation difference between two adjacent cooling water pools is not less than 10 m, the four cooling water pools are respectively connected with the underground heat source 2 through a first-stage injection pipe 41, a second-stage injection pipe 42, a third-stage injection pipe 43 and a fourth-stage injection pipe 44, meanwhile, a first-stage control valve 51 is arranged on the first-stage injection pipe 41, a third-stage control valve 53 is arranged on the third-stage injection pipe 43, and a fourth-stage control valve 54 is arranged on the fourth-stage injection pipe 44.

In addition, in the present embodiment, the third-stage injection pipe 43 is communicated with the first-stage injection pipe 41, the communication point is lower in elevation than the third-stage cooling water tank 33 and is located below the first-stage control valve 51, the fourth injection pipe 44 is communicated with the second-stage injection pipe 42, the communication point is lower in elevation than the fourth-stage cooling water tank 34, and the communication point of the fourth injection pipe 44 is lower in elevation than the communication point of the third injection pipe 43.

in the embodiment, the underground heat source 2 is a potential heat source of the underground nuclear power station, such as a containment vessel of the underground nuclear power station, a secondary side of a steam generator, a heat trap of a waste heat discharge system, and the like.

When the underground heat source cooling water circulation system is used, the third-stage control valve 53 and the fourth-stage control valve 54 are kept closed, the first-stage control valve 51 is opened, under the action of gravity, cooling water in the first-stage cooling water tank 31 flows into the underground heat source 2 along the first-stage injection pipe 41, heat exchange of the cooling water is completed at the underground heat source 2, the temperature of the cooling water is increased, under the action of high-level difference pressure difference between the first-stage cooling water tank 31 and the second-stage cooling water tank 32, the cooling water in the first-stage cooling water tank 31 can continuously enter the underground heat source 2 through the first-stage injection pipe 41 and then enters the second-stage cooling water tank 32 through the second-stage injection pipe 42, and in the process, heat in the underground heat source 2 is continuously taken out of.

After the water pressure in the first-stage cooling water tank 31 and the second-stage cooling water tank 32 is balanced, the third-stage control valve 53 is opened, the cooling water in the second-stage cooling water tank 32 enters the underground heat source 2 through the second-stage injection pipe 42 under the action of the high-level difference pressure difference between the second-stage cooling water tank 32 and the third-stage cooling water tank 33, then enters the third cooling water tank 33 through the first injection pipe 41 and the third injection pipe 43 in sequence, and in the process, the heat in the underground heat source 2 is continuously taken out of the ground.

after the water pressure in the second-stage cooling water tank 32 and the third-stage cooling water tank 33 is balanced, the fourth-stage control valve 54 is opened, the cooling water in the third-stage cooling water tank 33 enters the underground heat source 2 through the third-stage injection pipe 42 and the first-stage injection pipe 41 in sequence under the action of the high-level difference pressure difference between the third-stage cooling water tank 33 and the fourth-stage cooling water tank 34, and then enters the fourth-stage cooling water tank 34 through the second injection pipe 42 and the fourth injection pipe 44 in sequence, and in the process, the heat in the underground heat source 2 is continuously taken out of the ground.

In the whole working process of the embodiment, the cooling water is reduced through the elevation difference among the multi-stage cooling water pools, the cooling water is repeatedly and continuously cooled in the underground heat source 2, and the cooling duration is prolonged by 3 times under the condition of the same amount of cooling water.

the multistage reciprocating type passive cooling system of the underground nuclear power station is characterized in that multistage cooling water tanks are arranged at different elevations of a mountain 1 by utilizing the arrangement characteristics of the underground nuclear power station, the passive cooling system is pushed to operate by the elevation difference between the cooling water tanks, and cooling water is enabled to reciprocate among the cooling water tanks, so that the effective operation time of the passive cooling system is greatly prolonged, the cooling time is prolonged by at least 3 times under the condition of the same cooling water amount, and the safety is improved; the whole system can be passively operated, does not need to be pushed by external energy, and is simple and reliable; and through the communication between the injection pipes, the engineering cost is greatly reduced.