CN-121748014-B - Pressure stabilization system for nuclear power plant reactor coolant system gas discharge
Abstract
The invention provides a pressure stabilizing system for gas discharge of a nuclear power plant reactor coolant system, which comprises a pressure stabilizer and a gas treatment mechanism, wherein the pressure stabilizer is provided with at least one accident discharge pipeline, each accident discharge pipeline is sequentially provided with a flow limiting unit and an accident discharge valve along the medium flow direction, the gas treatment mechanism comprises a gas receiving pipeline and a receiving container, one end of the gas receiving pipeline is connected with the outlet end of the flow limiting unit, the other end of the gas receiving pipeline is connected into the receiving container, the gas receiving pipeline is provided with a pressure reducing valve, and the receiving container maintains a constant temperature and constant pressure state in the process of discharging gas from the gas receiving pipeline.
Inventors
- YUAN JINGTIAN
- WANG XUE
- CHEN LI
- DONG SHIXIN
- HUANG RUOTAO
- WU XINZHUANG
- ZHANG LIJUN
- ZHANG XIANGYUN
Assignees
- 上海核工程研究设计院股份有限公司
Dates
- Publication Date
- 20260508
- Application Date
- 20260228
Claims (5)
- 1. A pressure stabilizing system for nuclear power plant reactor coolant system gas emissions, comprising: The pressure stabilizer is provided with at least two parallel accident discharge pipelines, and each accident discharge pipeline is sequentially provided with a current limiting unit and an accident discharge valve along the medium flow direction; the gas treatment mechanism comprises a gas receiving pipeline and a receiving container, wherein one end of the gas receiving pipeline is connected with the outlet end of the flow limiting unit, the other end of the gas receiving pipeline is connected into the receiving container, the gas receiving pipeline is provided with a pressure reducing valve, The receiving container maintains a constant temperature and constant pressure state in the process of discharging gas from the gas receiving pipeline; The gas receiving pipeline is provided with a control valve at the upstream of the pressure reducing valve, and the control valve is used for controlling the on-off of the gas receiving pipeline; The gas receiving pipeline is further provided with a gas isolation valve at the upstream of the control valve; the gas receiving pipeline is provided with at least two branch pipelines at the upstream of the control valve, one end of each branch pipeline is connected with the outlet end of the flow limiting unit of the accident discharge pipeline, and the other end of each branch pipeline is converged to the control valve; the branch pipe is connected with the accident discharge pipe through a branch pipe at the downstream of the gas isolation valve; the cooling liquid is reserved in the receiving container, one end of the gas receiving pipeline extends into the cooling liquid, a heat exchanger positioned below the liquid level of the cooling liquid is arranged in the receiving container, and the heat exchanger continuously exchanges heat with the cooling liquid through an external cooling medium so as to maintain the temperature of the cooling liquid to be stable.
- 2. The pressure stabilizing system for nuclear power plant reactor coolant system gas discharge of claim 1, wherein the flow restricting unit is a flow restrictor.
- 3. The pressure stabilizing system for nuclear power plant reactor coolant system gas discharge of claim 1, wherein the receiving vessel top is further provided with a gas delivery line for delivering cooled hydrogen gas and connecting to a gas processing system.
- 4. The pressure stabilizing system for nuclear power plant reactor coolant system gas discharge of claim 1, wherein the coolant is cooling water or cooling oil.
- 5. The pressure stabilizing system for nuclear power plant reactor coolant system gas discharge of claim 1, wherein the medium in the accident discharge line is a mixed gas of steam and hydrogen.
Description
Pressure stabilization system for nuclear power plant reactor coolant system gas discharge Technical Field The invention relates to the technical field of reactor pressure stabilization, in particular to a pressure stabilizing system for gas discharge of a reactor coolant system of a nuclear power plant. Background During the operation of a nuclear power plant reactor coolant system, hydrogen needs to be injected into the system to maintain the reducibility state of the coolant, so that the oxidation corrosion of metal parts is avoided. During this process, some of the hydrogen escapes from the coolant and accumulates in the pressurizer vapor space, so that the vapor and hydrogen mixture must be vented by venting through the pressurizer vapor space at the end of each fuel cycle before the reactor is shut down to effect dehydrogenation. In the prior art, the mixed gas is usually directly discharged to a low-temperature low-pressure evacuation vessel, but because the discharged gas has the characteristics of high temperature, high pressure and radioactivity, the evacuation vessel can be rapidly heated and the internal pressure of the evacuation vessel is rapidly increased, so that the evacuation of the evacuation vessel needs to be frequently stopped for preventing the overpressure of the evacuation vessel, and the evacuation vessel is restarted after the evacuation vessel is recovered to be normal, and the intermittent evacuation mode is time-consuming and lengthy, thereby seriously reducing the availability of a nuclear power plant and remarkably adversely affecting the operation economy. Based on this, the present inventors propose a pressure stabilizing system for nuclear power plant reactor coolant system gas discharge in an effort to solve one or more of the above-mentioned technical problems. Disclosure of Invention The invention solves the technical problems by the following technical proposal: the invention provides a pressure stabilization system for nuclear power plant reactor coolant system gas discharge, comprising: the pressure stabilizer is provided with at least one accident discharge pipeline, and each accident discharge pipeline is sequentially provided with a flow limiting unit and an accident discharge valve along the medium flow direction; the gas treatment mechanism comprises a gas receiving pipeline and a receiving container, wherein one end of the gas receiving pipeline is connected with the outlet end of the flow limiting unit, the other end of the gas receiving pipeline is connected into the receiving container, the gas receiving pipeline is provided with a pressure reducing valve, The receiving container maintains a constant temperature and pressure state in the process of discharging the gas from the gas receiving pipeline. According to one embodiment of the invention, the flow restricting unit is a flow restrictor. According to one embodiment of the invention, the gas receiving pipeline is provided with a control valve upstream of the pressure reducing valve, and the control valve is used for controlling the on-off of the gas receiving pipeline. According to one embodiment of the invention, the gas receiving line is further provided with a gas isolation valve upstream of the control valve. According to one embodiment of the invention, the voltage stabilizer is provided with at least two parallel accident discharge pipelines; The gas receiving pipeline is provided with at least two branch pipelines at the upstream of the control valve, one end of each branch pipeline is connected with the outlet end of the flow limiting unit of the accident discharge pipeline, and the other end of each branch pipeline is converged to the control valve; The gas isolation valves are arranged on the branch pipelines in a one-to-one correspondence mode. According to one embodiment of the invention, the branch line is connected to the accident discharge line downstream of the gas isolation valve by a branch line. According to one embodiment of the invention, a cooling liquid is reserved in the receiving container, and one end of the gas receiving pipeline extends into the cooling liquid; the receiving container is internally provided with a heat exchanger below the liquid level of the cooling liquid, and the heat exchanger continuously exchanges heat with the cooling liquid through an external cooling medium so as to maintain the temperature of the cooling liquid to be stable. According to one embodiment of the invention, the top of the receiving container is further provided with a gas outlet pipe for leading out the cooled hydrogen and connecting to a gas treatment system. According to one embodiment of the invention, the cooling liquid is cooling water or cooling oil. According to one embodiment of the invention, the medium in the accident discharge pipeline is a mixed gas of water vapor and hydrogen. The invention has the positive progress effects that: The pressure stabilizing system for the gas di