CN217467999U - High-temperature reactor steam generator accident discharge valve and control loop thereof - Google Patents
High-temperature reactor steam generator accident discharge valve and control loop thereof Download PDFInfo
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- CN217467999U CN217467999U CN202221537055.2U CN202221537055U CN217467999U CN 217467999 U CN217467999 U CN 217467999U CN 202221537055 U CN202221537055 U CN 202221537055U CN 217467999 U CN217467999 U CN 217467999U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The present disclosure provides a thermopile steam generator emergency vent valve and a control circuit thereof. The control loop comprises a contactor, a protection switch relay and a protection switch trigger button; a coil of the protection switch relay is connected with the protection switch trigger button in series and then is connected with a power supply of the control loop; and the normally open auxiliary contact of the protective switch relay is connected with the coil of the contactor in series and then is connected into the power supply, and the normally open auxiliary contact of the contactor is connected on the main loop of the accident discharge valve in series. Through the protection switch relay and the protection switch trigger button, when the pressure of the secondary side of the steam generator is lower than that of the primary side, the protection switch signal can enable the valve to be quickly closed, the integrity of the radioactive barrier is guaranteed, and radioactive substances are prevented from leaking.
Description
Technical Field
The utility model belongs to the technical field of electrical equipment, concretely relates to high temperature reactor steam generator accident discharge valve and control circuit thereof.
Background
The steam generator is one of the key devices of the high-temperature gas cooled reactor nuclear power station, transfers the heat generated by the reactor core from the primary loop to the secondary loop, and generates qualified steam under the specified load to drive a steam turbine to generate electricity; during startup, shutdown and low-power operation, heat generated by the reactor core is transferred to a startup shutdown loop and then transferred to a final hot trap; the barrier is used for preventing the coolant and radioactive substances in the primary circuit from being released to the secondary circuit, and the integrity of the pressure boundary of the primary circuit is guaranteed. Therefore, the safe and reliable operation of the steam generator is closely related to the economy and safety of the nuclear power plant.
The steam generator of the high-temperature gas cooled reactor nuclear power station is designed to have secondary side pressure higher than primary side pressure during normal operation. Once the steam generator heat-transfer pipe takes place the broken pipe accident, intraductal water, vapour leak to a return circuit, and steam can cause the serious accident such as reactivity increase, a return circuit pressure rise and reactor core damage along with helium inflow reactor, consequently when starting discharge system under the accident situation, the blow-off valve should be able to open fast in order to discharge steam generator and main steam, the water and the steam in the trunk line.
The steam generator acts as a barrier against the release of radioactivity and must be kept intact against the release of radioactivity to the environment. Therefore, in the process of steam generator accidental discharge, the pressure of the first loop and the second loop gradually reaches balance, and in order to prevent helium in the first loop from entering the second loop due to too low pressure of the second loop and ensure the integrity of the radioactive barrier, the accidental discharge of the steam generator needs to be stopped.
The evaporator emergency discharge valve is a solenoid valve which is closed when power is lost, the valve is quick to open and close, the sealing performance is good, the protection opening can be quickly opened under the emergency condition to ensure the discharge effect, and the damage of a reactor core caused by the water inflow of a reactor is prevented; when the secondary side pressure of the steam generator is lower than the primary side pressure, the protection closing signal can enable the valve to be closed quickly, the integrity of the radioactive barrier is ensured, and radioactive substances are prevented from leaking; the electromagnetic valve is kept closed under the condition of power loss, the integrity of the radioactive barrier is guaranteed, radioactive products are contained, the basic safety function of the nuclear power plant of radioactive containment is realized, and meanwhile the fault safety principle is also met. Therefore, when designing a valve control loop, the valve is ensured to be reliably opened under the accident condition, and meanwhile, the valve is ensured to be reliably closed under any condition.
SUMMERY OF THE UTILITY MODEL
The present disclosure is directed to at least one of the problems of the prior art, and provides an emergency vent valve of a steam generator of a thermopile and a control circuit thereof.
In one aspect of the present disclosure, a control circuit for a thermopile steam generator emergency vent valve is provided, the control circuit including a contactor, a protection off relay, and a protection off trigger button;
a coil of the protection switch relay is connected with the protection switch trigger button in series and then is connected with a power supply of the control loop;
and the normally open auxiliary contact of the protective switch relay is connected with the coil of the contactor in series and then is connected into the power supply, and the normally open auxiliary contact of the contactor is connected on the main loop of the accident discharge valve in series.
In some embodiments, the control loop further comprises a protection off indicator light;
and the normally closed auxiliary contact of the protection switch relay is connected with the protection switch indicating lamp in series and then is connected with the power supply.
In some embodiments, the control loop further comprises a protection on relay and a protection on trigger button;
the coil of the protection switch relay is connected with the protection switch trigger button in series and then connected into the power supply, and the normally open auxiliary contact of the protection switch relay is connected with the normally open auxiliary contact of the protection switch relay in series.
In some embodiments, the control loop further comprises a protection on indicator light;
the protection switch indicator light is connected in parallel with a coil of the protection switch relay.
In some embodiments, the control circuit further comprises a manual open valve;
and the manual opening valve is connected with a normally open auxiliary contact of the protection closing relay in series.
In some embodiments, when the control loop includes a protective opening relay, the normally open auxiliary contact of the protective opening relay is in parallel with the manually opened valve.
In some embodiments, the control circuit further comprises a circuit breaker connected in series with the emergency vent valve main circuit.
In another aspect of the present disclosure, there is provided a thermopile steam generator emergency vent valve including the control circuit set forth above.
According to the accident discharge valve of the high-temperature reactor steam generator and the control loop thereof, the protection closing relay and the protection closing trigger button are arranged, so that when the secondary side pressure of the steam generator is lower than the primary side pressure, the protection closing signal can enable the valve to be quickly closed, the integrity of a radioactive barrier is ensured, and radioactive substances are prevented from leaking. In addition, through the protection opening relay and the protection opening trigger button, when the reactor system has an accident, the protection opening signal can enable the valve to be quickly opened, the emission effect can be rapidly ensured to be rapidly opened under the accident condition, and the reactor core damage caused by reactor water inflow is prevented.
Drawings
Fig. 1 is a schematic structural diagram of a control circuit of an emergency vent valve of a steam generator of a high temperature stack according to an embodiment of the present disclosure.
Detailed Description
For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1, the present embodiment relates to a control circuit of a thermopile steam generator emergency vent valve, which includes a contactor QAC, a protection on relay KA1, a protection on trigger button ST1, a protection off relay KA2, and a protection off trigger button ST 2. The coil of the protection switch relay KA1 is connected with the protection switch trigger button ST1 in series and then connected with the power supply. And the coil of the protection switch relay KA2 is connected with the protection switch trigger button string ST2 and then is connected with the power supply of the control loop. The protection opens relay KA 1's normally open auxiliary contact with protection closes relay KA 2's normally open auxiliary contact, access after the coil of contactor QAC connects in series the power. And a normally open auxiliary contact of the contactor QAC is connected in series with the main loop of the emergency discharge valve.
Specifically, as shown in fig. 1, in the normal operation and no accident situation, the reactor protection system protection on signal is 0 (open contact), the protection off signal is 1 (closed contact), that is, the protection on trigger button ST1 is open, and the protection off trigger button ST2 is closed, so the protection off relay KA2 is powered on, the normally open auxiliary contact is closed, and the unblocking valve is opened.
Under the condition of an accident, the reactor protection system triggers an evaporator accident discharge signal, a protection opening signal is changed into 1 (a closed contact), namely, a protection opening trigger button ST2 is closed, a normally open auxiliary contact of a protection opening relay KA1 is closed, a control loop is conducted, a contactor QAC is electrified, a primary loop is connected, a valve electric fitting is electrified, a valve is opened, and the steam generator accident discharge function is realized.
When the accident is discharged to a certain degree, and the secondary pressure of the steam generator is smaller than the primary pressure, the reactor protection system triggers an accident discharge valve protection off signal, the protection off signal becomes 0 (a disconnection contact), namely a protection off trigger button ST2 is disconnected, the protection off relay KA2 is powered off, a normally open auxiliary contact of the protection off relay KA2 is disconnected, a control loop is disconnected, a contactor QAC is powered off, the primary loop is powered off, a valve electric device is powered off, a valve is closed, the accident discharge of the evaporator is finished (even if the accident discharge protection on signal exists), the integrity of the radioactive barrier is ensured, and the radioactive substance is prevented from leaking.
The control circuit of the emergency vent valve of the high-temperature reactor steam generator in the embodiment can enable the valve to be quickly closed by the protection closing signal when the secondary side pressure of the steam generator is lower than the primary side pressure through the protection closing relay and the protection closing trigger button, so that the integrity of the radioactive barrier is ensured, and radioactive substances are prevented from leaking. In addition, through the protection opening relay and the protection opening trigger button, when the reactor system has an accident, the protection opening signal can enable the valve to be quickly opened, the emission effect can be rapidly ensured to be rapidly opened under the accident condition, and the reactor core damage caused by reactor water inflow is prevented.
After the control loop is adopted to control the steam valve steam accident discharge valve, the valve can be rapidly opened to realize the discharge function by simulating the reactor protection steam generator accident discharge trigger signal, and under the condition that the steam generator accident discharge trigger signal is triggered, when the simulated steam generator secondary side pressure is smaller than the primary side pressure, the valve control loop is disconnected, the valve is powered off, and the valve is reliably closed. Meanwhile, under the conditions of switch failure outage, reactor protection system outage and the like (a protection off signal is changed from normal operation 1 to 0), the valve is locked and opened to be reliably closed, and the control function is realized.
It should be noted that, the control circuit of the emergency relief valve of the high temperature stack steam generator of this embodiment may include only a protection on-relay or a protection off-relay in addition to the protection on-relay and the protection off-relay, and in the embodiment that includes only one relay, it is preferable to provide the protection off-relay to ensure that when the secondary pressure of the steam generator is lower than the primary pressure, the protection off-signal can rapidly close the valve, ensure the integrity of the radioactive barrier, and prevent the radioactive substances from leaking out.
Illustratively, as shown in fig. 1, the control loop further includes a protection on indicator light L1 and a protection off indicator light L2. The protection switch-on indicator lamp L1 is connected in parallel with a coil of the protection switch-on relay KA 1. The normally closed auxiliary contact of the protection switch relay KA2 is connected with the protection switch indicator lamp L2 in series and then connected with the power supply.
Specifically, as shown in fig. 1, in the case of normal operation without an accident, the reactor protection system protection on signal is 0 (open contact), and the protection off signal is 1 (closed contact), that is, the protection on trigger button ST1 is off, the protection indicator lamp L1 is not lit, and the protection off trigger button ST2 is closed, so that the protection off relay KA2 is powered, the normally closed auxiliary contact thereof is off, the protection indicator lamp L2 is not lit, the normally open auxiliary contact is closed, and the unblocking valve is opened.
Under the condition of an accident, the reactor protection system triggers an evaporator accident discharge signal, a protection on signal is changed into 1 (a closed contact), namely, a protection on trigger button ST2 is closed, a protection on indicator lamp L1 is bright, a normally open auxiliary contact of a protection on relay KA1 is closed, a control loop is conducted, a contactor QAC is electrified, a primary loop is conducted, a valve electric appliance is electrified, a valve is opened, and the steam generator accident discharge function is realized.
When the accident is discharged to a certain degree, when the secondary pressure of the steam generator is smaller than the primary pressure, the reactor protection system triggers an accident discharge valve protection off signal, the protection off signal becomes 0 (a disconnection contact), namely a protection off trigger button ST2 is disconnected, the protection off relay KA2 is powered off, a normally closed auxiliary contact of the protection off relay KA2 is closed, a protection off indicator lamp L2 is on, the normally open auxiliary contact is disconnected, a control loop is disconnected, a contactor QAC is powered off, a primary loop is powered off, a valve electric device is powered off, the valve is closed, the accident discharge of the evaporator is finished (even if an accident discharge protection on signal exists), the integrity of the radioactive barrier is ensured, and the radioactive substance is prevented from being discharged.
Illustratively, as shown in fig. 1, the control circuit further includes a manually opened valve SA. The manual opening valve SA is connected in series with a normally open auxiliary contact of the protection closing relay KA 2. The normally open auxiliary contact of the protection opening relay KA1 is connected in parallel with the manual opening valve SA.
Illustratively, as shown in fig. 1, the control circuit further comprises a circuit breaker connected in series with the accident discharge valve main circuit.
In another aspect of the present disclosure, an emergency vent valve of a steam generator of a high temperature reactor is provided, which includes the control circuit described above, and the detailed description thereof may be specifically referred to and will not be repeated herein.
The emergency relief valve of the high-temperature reactor steam generator in the embodiment has the control loop described above, and the protection off relay and the protection off trigger button are arranged, so that when the secondary pressure of the steam generator is lower than the primary pressure, the protection off signal can quickly close the valve, thereby ensuring the integrity of the radioactive barrier and preventing radioactive substances from leaking. In addition, through the protection opening relay and the protection opening trigger button, when the reactor system has an accident, the protection opening signal can enable the valve to be quickly opened, the emission effect can be rapidly ensured to be rapidly opened under the accident condition, and the reactor core damage caused by reactor water inflow is prevented.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.
Claims (8)
1. A control circuit of an accident discharging valve of a high-temperature reactor steam generator is characterized by comprising a contactor, a protection switch relay and a protection switch trigger button;
a coil of the protection switch relay is connected with the protection switch trigger button in series and then is connected with a power supply of the control loop;
and the normally open auxiliary contact of the protective switch relay is connected with the coil of the contactor in series and then is connected into the power supply, and the normally open auxiliary contact of the contactor is connected on the main loop of the accident discharge valve in series.
2. The control loop of claim 1, further comprising a protection off indicator light;
and the normally closed auxiliary contact of the protection switch relay is connected with the protection switch indicating lamp in series and then is connected with the power supply.
3. The control circuit of claim 1, further comprising a protection on relay and a protection on trigger button;
the coil of the protection switch relay is connected with the protection switch trigger button in series and then connected into the power supply, and the normally open auxiliary contact of the protection switch relay is connected with the normally open auxiliary contact of the protection switch relay in series.
4. The control loop of claim 1, further comprising a protection on indicator light;
the protection switch indicator light is connected in parallel with a coil of the protection switch relay.
5. The control circuit according to any one of claims 1 to 4, further comprising a manually opened valve;
and the manual opening valve is connected with a normally open auxiliary contact of the protection closing relay in series.
6. The control circuit of claim 5, wherein when the control circuit includes a protective open relay, a normally open auxiliary contact of the protective open relay is in parallel with the manually open valve.
7. The control circuit of any one of claims 1 to 4, further comprising a circuit breaker connected in series with the emergency vent valve main circuit.
8. A thermopile steam generator emergency vent valve characterized by comprising the control circuit of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221537055.2U CN217467999U (en) | 2022-06-20 | 2022-06-20 | High-temperature reactor steam generator accident discharge valve and control loop thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221537055.2U CN217467999U (en) | 2022-06-20 | 2022-06-20 | High-temperature reactor steam generator accident discharge valve and control loop thereof |
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| Publication Number | Publication Date |
|---|---|
| CN217467999U true CN217467999U (en) | 2022-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221537055.2U Active CN217467999U (en) | 2022-06-20 | 2022-06-20 | High-temperature reactor steam generator accident discharge valve and control loop thereof |
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| Country | Link |
|---|---|
| CN (1) | CN217467999U (en) |
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2022
- 2022-06-20 CN CN202221537055.2U patent/CN217467999U/en active Active
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