CN114017828A - Emergency heat supply system and method for nuclear power unit - Google Patents
Emergency heat supply system and method for nuclear power unit Download PDFInfo
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- CN114017828A CN114017828A CN202111320915.7A CN202111320915A CN114017828A CN 114017828 A CN114017828 A CN 114017828A CN 202111320915 A CN202111320915 A CN 202111320915A CN 114017828 A CN114017828 A CN 114017828A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 119
- 238000000605 extraction Methods 0.000 claims abstract description 117
- 238000002955 isolation Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/02—Arrangements of auxiliary equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/06—Heat exchangers
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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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- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- High Energy & Nuclear Physics (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides an emergency heat supply system and method for a nuclear power unit, which comprises the following steps: a main engine side exhaust pipeline, an emergency heating steam extraction pipeline and a heating steam extraction heat exchanger; the steam inlet end of the main engine bypass exhaust pipeline is connected with the main engine bypass exhaust valve; the steam inlet end of the emergency heating steam extraction pipeline is connected with a pipeline between two electric isolation valves on the other exhaust pipeline of the host, the steam outlet end of the emergency heating steam extraction pipeline is connected with the heating steam extraction heat exchanger, and the electric isolation valves, the check valves and the temperature and pressure reduction devices are sequentially installed from the steam inlet end to the steam outlet end on the emergency heating steam extraction pipeline. When the conventional island equipment breaks down and needs to be shut down, the equipment can be shut down without shutdown, heating steam extraction can be met, and the civil heat supply requirement is guaranteed.
Description
Technical Field
The invention belongs to the technical field of nuclear power heat supply, and particularly relates to an emergency heat supply system and method for a nuclear power unit.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the vigorous popularization of nuclear power units and the increasing demand of civil heat supply, the nuclear power units begin to supply heat for civil use, and nuclear power participates in the civil heat supply, so that the economic benefit of the nuclear power units is improved on one hand, and the civil heat supply is powerfully guaranteed on the other hand.
Civil heat supply extraction steam of a nuclear power unit generally comes from high-pressure cylinder exhaust steam or certain stage extraction steam of a steam turbine, then enters a steam-water heat exchanger to heat circulating water, and finally heats circulating water of a resident heating heat supply network through the water-water heat exchanger.
The existing heating and steam extraction heating mode is applicable to normal operation of a nuclear island and a conventional island, but when the conventional island has a large fault and needs to be shut down for processing, the conventional island must be shut down simultaneously, so that steam can not be supplied to the outside, and the civil heat supply cannot be guaranteed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the emergency heat supply system of the nuclear power unit, which can be stopped and not stopped when the conventional island equipment breaks down and needs to be stopped, and can meet the heating and steam extraction requirements and guarantee the heat supply requirements of people.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
on the one hand, the utility model discloses an emergent heating system of nuclear power unit, includes:
a main engine side exhaust pipeline, an emergency heating steam extraction pipeline and a heating steam extraction heat exchanger;
the steam inlet end of the main engine bypass exhaust pipeline is connected with the main engine bypass exhaust valve;
the steam inlet end of the emergency heating steam extraction pipeline is connected with a pipeline between two electric isolation valves on the other exhaust pipeline of the host, the steam outlet end of the emergency heating steam extraction pipeline is connected with the heating steam extraction heat exchanger, and the electric isolation valves, the check valves and the temperature and pressure reduction devices are sequentially installed from the steam inlet end to the steam outlet end on the emergency heating steam extraction pipeline.
Furthermore, the steam outlet end of the main engine bypass exhaust pipeline is connected with the condenser.
Furthermore, a temperature and pressure reducing device is installed on one side of the steam outlet end of the main engine side exhaust pipeline.
Furthermore, the heating system also comprises a normal heating steam extraction pipeline, wherein the steam inlet end of the normal heating steam extraction pipeline is connected with a high-pressure cylinder steam outlet or a steam extraction port of a certain stage of steam extraction of a steam turbine.
Furthermore, the steam outlet end of the normal heating steam extraction pipeline is connected with the heating steam extraction heat exchanger.
Furthermore, an isolating valve and a check valve are sequentially arranged on the normal heating steam extraction pipeline from the steam inlet end to the steam outlet end.
Furthermore, the drain pipeline of the heating steam extraction heat exchanger is connected with a main machine condensed water pipeline, and the main machine condensed water pipeline comprises a low water-adding side pipeline, a deaerator and a high water-adding side pipeline which are sequentially connected.
On the other hand, the emergency heat supply method for the nuclear power unit is disclosed, and comprises the following steps:
when the nuclear power unit is used for emergency heat supply, the high-pressure main steam valve and the high-pressure regulating valve are closed, the isolation valve and the check valve on the normal heating steam extraction pipeline are closed, the main engine side exhaust valve is opened, the electric isolation valve close to the steam inlet end on the main engine side exhaust pipeline is opened, the electric isolation valve close to the steam outlet end is closed, the isolation valve and the check valve on the emergency heating steam extraction pipeline are opened, heating steam is led out by the main engine side exhaust valve, and main steam passes through the main engine side exhaust pipeline and the emergency heating steam extraction pipeline and exchanges heat with the heating steam extraction heat exchanger.
Further, the method also comprises the following steps: when the nuclear power unit normally supplies heat, heating extraction steam is led out by high-pressure cylinder exhaust steam or certain stage extraction steam of a steam turbine, and the normal heating extraction steam is led out to a heating extraction steam heat exchanger for heat exchange.
Furthermore, the drain water of the heating steam extraction heat exchanger flows to the nuclear island through a low water adding side pipeline, a deaerator and a high water adding side pipeline to provide cooling water for the nuclear island.
The above one or more technical solutions have the following beneficial effects:
according to the technical scheme, when the conventional island equipment breaks down and needs shutdown processing, main steam passes through the emergency heating steam extraction pipeline and supplies steam to the heating steam extraction heat exchanger after temperature and pressure reduction, so that civil heat supply is guaranteed, meanwhile, drainage of the heating steam extraction heat exchanger flows to the nuclear island through the low water adding side pipeline, the deaerator and the high water adding side pipeline, cooling water is provided for the nuclear island, and shutdown and non-shutdown are achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a diagram of a nuclear power generating unit emergency heating system according to a first embodiment of the present invention;
the system comprises a main engine side exhaust valve 1, a main engine side exhaust valve 2, a first electric isolation valve 3, a second electric isolation valve 4, a first temperature and pressure reducing device 5, a main engine side exhaust pipeline 6, a normal heating steam extraction pipeline 7, a third electric isolation valve 8, a first check valve 9, a fourth electric isolation valve 10, a second check valve 11, a second temperature and pressure reducing device 12, an emergency heating steam extraction pipeline 13, a main steam pipeline 14, a high-pressure main steam valve 15 and a high-pressure regulating valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The first embodiment is as follows:
referring to the attached drawing 1, the embodiment discloses an emergency heating system of a nuclear power unit, which includes: a normal heating steam extraction pipeline 6, a main engine bypass exhaust pipeline 5, an emergency heating steam extraction pipeline 12, a heating steam extraction heat exchanger, a condenser and a main engine condensed water pipeline.
The normal heating steam extraction pipeline 6 refers to high-pressure cylinder exhaust steam or steam extraction of a certain stage of a steam turbine. The main steam pipeline 13 is connected with a high-pressure cylinder, a high-pressure main steam valve 14 and a high-pressure regulating valve 15 are arranged on a pipeline connecting the main steam pipeline 13 and the high-pressure cylinder, namely, main steam sequentially flows through the high-pressure main steam valve 14 and the high-pressure regulating valve 15 on the main steam pipeline 13 to enter the high-pressure cylinder, the steam inlet end of the normal heating steam extraction pipeline 6 is connected with a steam outlet of the high-pressure cylinder or a steam extraction port of a certain level of steam extraction of a steam turbine, and the steam outlet end is connected with a heating steam extraction heat exchanger. An isolating valve (a third isolating valve 7) and a check valve (a first check valve 8) are sequentially arranged on the normal heating steam extraction pipeline 6 from the steam inlet end to the steam outlet end.
The main engine side exhaust pipeline 5 and the emergency heating steam extraction pipeline 12 form an emergency heating steam extraction passage, the emergency heating steam extraction pipeline 12 is connected with a pipeline between two electric isolation valves (a first electric isolation valve 2 and a second electric isolation valve 3) on the main engine side exhaust pipeline 5, and high-temperature and high-pressure steam enters the heating steam extraction heat exchanger after passing through the temperature and pressure reduction device.
The heating steam extraction drainage pipeline is connected with the main machine condensed water pipeline after passing through the heating steam extraction heat exchanger, and drainage of normal heating steam extraction and drainage of heating steam extraction in emergency are both carried out on the main machine condensed water pipeline.
The main steam pipeline 13 is also connected with the main engine bypass valve 1, the steam inlet end of the main engine bypass pipeline 5 is connected with the main engine bypass valve 1, and the steam outlet end is connected with the condenser. Two electric isolation valves (a first electric isolation valve 2 and a second electric isolation valve 3) and a temperature and pressure reducing device (a first temperature and pressure reducing device 4) are sequentially arranged on the main engine side exhaust pipeline 5 from the steam inlet end to the steam outlet end.
A temperature and pressure reducing device is installed on one side of the steam outlet end of the main engine side exhaust pipeline 5, two electric isolation valves are installed on a pipeline from a main engine side exhaust valve to the temperature and pressure reducing device of the condenser, an opening is formed in the main engine side exhaust pipeline between the two electric isolation valves according to the steam flow direction, an emergency heating steam extraction pipeline is laid and led to a heating steam extraction heat exchanger, and the pipeline is also provided with the electric isolation valves and the check valves. The electric isolation valve and the check valve of the emergency heating steam extraction pipeline are additionally provided with a temperature and pressure reducing device at the section of pipeline from the back of the emergency heating steam extraction pipeline to the front of the heating steam extraction heat exchanger. Namely, the steam inlet end of the emergency heating steam extraction pipeline 12 is connected with the two electric isolation valves of the main engine bypass exhaust pipeline, the steam outlet end of the emergency heating steam extraction pipeline 12 is connected with the heating steam extraction heat exchanger, and the electric isolation valve (fourth electric isolation valve 9), the check valve (second check valve 10) and the temperature and pressure reducing device (second temperature and pressure reducing device 11) are sequentially installed on the emergency heating steam extraction pipeline 12 from the steam inlet end to the steam outlet end.
The drainage pipeline of the heating steam extraction heat exchanger is connected with a main machine condensed water pipeline which consists of three sections of pipelines and comprises a low water adding side pipeline, a deaerator and a high water adding side pipeline which are sequentially connected. The drain water of the heating steam extraction heat exchanger sequentially flows through the low water adding side pipeline, the deaerator and the high water adding side pipeline to the nuclear island according to the flow direction, and cooling water is provided for the nuclear island.
When the nuclear power unit normally supplies heat, heating extraction steam is led out by high-pressure cylinder exhaust steam or steam extraction of a certain stage of a steam turbine, and flows through a normal heating extraction steam pipeline to a heating extraction steam heat exchanger for heat exchange, and extraction steam is drained and led to a condensed water section of a main machine. When in emergency heat supply, heating extraction steam is led out from the main engine bypass exhaust valve, and then flows out from the main engine bypass exhaust pipeline and the emergency heating extraction pipeline to the heating extraction steam heat exchanger for heat exchange, and extraction steam is drained and led to the main engine condensed water section.
When the conventional island equipment fails and needs to be shut down, the emergency heating system of the nuclear power unit can be shut down without shutdown; meanwhile, the heating and steam extraction can be met, and the civil heat supply requirement is guaranteed.
Example two:
the embodiment discloses an emergency heat supply method for a nuclear power unit, which comprises the following steps:
when the nuclear power unit normally supplies heat, the high-pressure main steam valve and the high-pressure regulating valve are opened, the isolating valve and the check valve on the emergency heating steam extraction pipeline are closed, and the temperature and pressure reducing device is stopped; an isolation valve and a check valve on a normal heating steam extraction pipeline are both opened; and closing the main engine side exhaust valve, closing two isolating valves on the main engine side exhaust pipeline, and stopping the temperature and pressure reducing device. The heating extraction steam is led out by the high-pressure cylinder exhaust steam or the extraction steam of a certain stage of a steam turbine, and then flows through a normal heating extraction steam pipeline to a heating extraction steam heat exchanger for heat exchange, and the extraction steam is drained and led to a condensed water section of a main machine.
When the nuclear power unit supplies heat in emergency, the high-pressure main steam valve and the high-pressure regulating valve are closed, the high-pressure cylinder does not enter steam any more, the steam turbine can be shut down, heating steam extraction is led out after the main engine side exhaust valve, and then flows out of the main engine side exhaust pipeline and the emergency heating steam extraction pipeline to the heating steam extraction heat exchanger for heat exchange, and steam extraction water is led to a main engine condensed water section. In the heating and heating season, when the conventional island equipment breaks down and needs shutdown processing, an isolation valve and a check valve on a normal heating steam extraction pipeline are closed, a main engine side exhaust valve is opened, a first electric isolation valve (namely, an electric isolation valve close to a steam inlet end) on a main engine side exhaust pipeline is opened, a second electric isolation valve (namely, an electric isolation valve close to a steam outlet end) is closed, an isolation valve and a check valve on an emergency heating steam extraction pipeline are opened, a temperature and pressure reducing device on the emergency heating steam extraction pipeline is used, main steam passes through the main engine side exhaust pipeline and the emergency heating steam extraction pipeline, steam is supplied to a heating steam extraction heat exchanger after temperature and pressure reduction, civil heat supply is guaranteed, meanwhile, drain water of the heating steam extraction heat exchanger passes through a low water adding side pipeline, a deaerator and a high water adding side pipeline to a nuclear island, cooling water is provided for the nuclear island, and shutdown and non-shutdown stacking is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides an emergent heating system of nuclear power unit, characterized by includes: a main engine side exhaust pipeline, an emergency heating steam extraction pipeline and a heating steam extraction heat exchanger;
the steam inlet end of the main engine bypass exhaust pipeline is connected with the main engine bypass exhaust valve;
the steam inlet end of the emergency heating steam extraction pipeline is connected with a pipeline between two electric isolation valves on the other exhaust pipeline of the host, the steam outlet end of the emergency heating steam extraction pipeline is connected with the heating steam extraction heat exchanger, and the electric isolation valves, the check valves and the temperature and pressure reduction devices are sequentially installed from the steam inlet end to the steam outlet end on the emergency heating steam extraction pipeline.
2. The emergency heating system of claim 1, wherein a steam outlet end of the main unit bypass pipeline is connected to the condenser.
3. The emergency heating system of claim 1, wherein a temperature and pressure reducing device is installed on one side of the steam outlet end of the main engine bypass pipeline.
4. The emergency heating system of claim 1, further comprising a normal heating steam extraction pipeline, wherein a steam inlet end of the normal heating steam extraction pipeline is connected to a steam outlet of a high-pressure cylinder or a steam extraction port of a certain stage of a steam turbine.
5. The emergency heating system of claim 4, wherein a steam outlet end of the normal heating steam extraction pipeline is connected with the heating steam extraction heat exchanger.
6. The emergency heating system of claim 4, wherein the normal heating steam extraction pipeline is sequentially provided with an isolation valve and a check valve from a steam inlet end to a steam outlet end.
7. The emergency heating system of claim 1, wherein the drain pipe of the heating steam extraction heat exchanger is connected to a main engine condensate pipe, and the main engine condensate pipe comprises a low water-adding side pipe, a deaerator and a high water-adding side pipe which are connected in sequence.
8. An emergency heat supply method for a nuclear power unit is characterized by comprising the following steps:
when the nuclear power unit is used for emergency heat supply, the high-pressure main steam valve and the high-pressure regulating valve are closed, the steam turbine does not enter steam, the isolation valve and the check valve on the normal heating steam extraction pipeline are closed, the main engine side exhaust valve is opened, the electric isolation valve close to the steam inlet end on the main engine side exhaust pipeline is opened, the electric isolation valve close to the steam outlet end is closed, the isolation valve and the check valve on the emergency heating steam extraction pipeline are opened, heating steam is led out by the main engine side exhaust valve, and main steam passes through the main engine side exhaust pipeline and the emergency heating steam extraction pipeline and exchanges heat with the heating steam extraction heat exchanger.
9. The emergency heat supply method of the nuclear power generating unit as claimed in claim 8, further comprising: when the nuclear power unit normally supplies heat, heating extraction steam is led out by high-pressure cylinder exhaust steam or certain stage extraction steam of a steam turbine, and the normal heating extraction steam is led out to a heating extraction steam heat exchanger for heat exchange.
10. The emergency heat supply method of the nuclear power generating unit as claimed in claim 8 or 9, wherein the drain water of the heating steam extraction heat exchanger is supplied to the nuclear island through a low water-adding side pipeline, a deaerator and a high water-adding side pipeline to supply cooling water to the nuclear island.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111320915.7A CN114017828A (en) | 2021-11-09 | 2021-11-09 | Emergency heat supply system and method for nuclear power unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111320915.7A CN114017828A (en) | 2021-11-09 | 2021-11-09 | Emergency heat supply system and method for nuclear power unit |
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| CN108301884A (en) * | 2017-12-27 | 2018-07-20 | 东南大学 | A kind of pumping that adding steam jet ejector coagulates heating system and its adjusting method |
| CN208186476U (en) * | 2018-04-11 | 2018-12-04 | 赫普科技发展（北京）有限公司 | Electrode boiler combines heat accumulation water pot power grid depth peak regulation system |
| CN111288531A (en) * | 2020-03-31 | 2020-06-16 | 西安西热节能技术有限公司 | Emergency heating system and method based on high-low pressure bypass combined heating |
-
2021
- 2021-11-09 CN CN202111320915.7A patent/CN114017828A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392693A (en) * | 2011-11-28 | 2012-03-28 | 北京北重汽轮电机有限责任公司 | Heating cogeneration turbogenerator system |
| JP2013224764A (en) * | 2012-04-20 | 2013-10-31 | Rinnai Corp | Heat supply device |
| CN206386989U (en) * | 2016-12-16 | 2017-08-08 | 赫普热力发展有限公司 | Solid electric heat-storage device combines heat accumulation water pot power network depth peak regulation system |
| CN108301884A (en) * | 2017-12-27 | 2018-07-20 | 东南大学 | A kind of pumping that adding steam jet ejector coagulates heating system and its adjusting method |
| CN208186476U (en) * | 2018-04-11 | 2018-12-04 | 赫普科技发展（北京）有限公司 | Electrode boiler combines heat accumulation water pot power grid depth peak regulation system |
| CN111288531A (en) * | 2020-03-31 | 2020-06-16 | 西安西热节能技术有限公司 | Emergency heating system and method based on high-low pressure bypass combined heating |
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Application publication date: 20220208 |