CN110242860B - Anti-icing system and method for rapid and safe emission of supercritical CO2 power generation system - Google Patents
Anti-icing system and method for rapid and safe emission of supercritical CO2 power generation system Download PDFInfo
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- CN110242860B CN110242860B CN201910583084.9A CN201910583084A CN110242860B CN 110242860 B CN110242860 B CN 110242860B CN 201910583084 A CN201910583084 A CN 201910583084A CN 110242860 B CN110242860 B CN 110242860B
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- lubricant
- freeze
- inlet
- valve
- outlet
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- 238000010248 power generation Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 88
- 238000007710 freezing Methods 0.000 claims description 30
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000008014 freezing Effects 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- 108010053481 Antifreeze Proteins Proteins 0.000 claims 2
- 230000002528 anti-freeze Effects 0.000 claims 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 141
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 68
- 235000011089 carbon dioxide Nutrition 0.000 abstract description 54
- 239000001569 carbon dioxide Substances 0.000 abstract description 19
- 238000004891 communication Methods 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- -1 slow opening valves Chemical compound 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
- F17D1/05—Preventing freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
Abstract
The invention discloses an anti-icing system and method for quick and safe emission of a supercritical CO2 power generation system, wherein the system comprises the following components: the system can monitor the pressure of the system constantly, ensure the supply of the freeze-proof lubricant, ensure that the freeze-proof lubricant is not mixed into the system, effectively prevent the throttle components such as a valve, a pipe orifice and the like from generating dry ice when the carbon dioxide is rapidly depressurized and cooled, block the valve and the pipe, ensure the rapid discharge of the carbon dioxide and also comprise the valve not to be damaged.
Description
Technical Field
The invention belongs to the technical field of energy utilization, and particularly relates to an anti-icing system and method for rapid and safe emission of a supercritical CO2 power generation system.
Background
Under the large background of energy shortage and environmental crisis, increasing the energy utilization rate is increasingly receiving attention. Currently, the supercritical brayton cycle is one of the most advantageous forms of cycle among many thermodynamic cycles. The novel supercritical working medium carbon dioxide has the advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-power conversion efficiency, reduce the equipment volume and has high economical efficiency.
However, there are also some differences between this type of cycle and the conventional rankine cycle. The supercritical carbon dioxide Brayton cycle adopts carbon dioxide as a working medium instead of water, and the carbon dioxide is nontoxic and nonflammable, but is colorless and odorless, so that a large amount of carbon dioxide is not easy to find when being gathered, and particularly, the carbon dioxide is easy to cause suffocation of personnel when being gathered on the ground, thereby threatening the life safety. When the supercritical carbon dioxide circulating power generation system encounters an emergency working condition or an accident working condition, a large amount of carbon dioxide in the unit needs to be rapidly and intensively discharged into the outdoor atmosphere, and the supercritical carbon dioxide circulating power generation system cannot be scattered indoors. This requires that carbon dioxide is exhausted through a dedicated exhaust duct, which is typically provided with an exhaust valve that opens rapidly to exhaust carbon dioxide when an emergency condition is encountered. However, a characteristic of carbon dioxide makes this valve vulnerable to damage or failure. The carbon dioxide can be rapidly cooled when being discharged by high pressure drop suddenly, dry ice is generated, and when the temperature of a pipeline is rapidly reduced, the dry ice is easily adhered in a valve channel to block the valve, so that the valve cannot be closed or is not tightly closed, and even the pipeline is blocked to seriously influence the discharge speed. This is usually avoided by operating in systems using carbon dioxide, such as slow opening valves, slow venting, but is not possible when rapid large venting is required in emergency conditions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an anti-icing system and method for quick and safe discharge of a supercritical CO2 power generation system, which can effectively avoid the phenomena of dry ice generation, valve blockage or pipeline blockage during quick discharge of carbon dioxide.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an anti-icing system for rapid and safe discharge of a supercritical CO2 power generation system comprising: the anti-freezing lubricant storage tank 1, the anti-freezing lubricant injection pump 2, the anti-freezing lubricant buffer tank 3, the anti-freezing lubricant outlet valve 4, the anti-freezing lubricant bypass valve 5, the CO2 exhaust pipeline inlet check valve 6, the CO2 exhaust pipeline inlet filter 7 and the CO2 exhaust valve 8, wherein the anti-freezing lubricant adopts a low freezing point and low volatile point organic working medium; under emergency or accident conditions, the inlet of the exhaust pipe for rapidly discharging CO2 working medium is communicated with the inlet of the CO2 exhaust pipe inlet check valve 6, the outlet of the CO2 exhaust pipe inlet check valve 6 is communicated with the inlet of the CO2 exhaust pipe inlet filter 7, the outlet of the CO2 exhaust pipe inlet filter 7 is communicated with the inlet of the CO2 exhaust valve 8, the outlet of the CO2 exhaust valve 8 is communicated with the outlet of the exhaust pipe for CO2 working medium, the outlet of the freeze-resistant lubricant storage tank 1 is communicated with the inlet of the freeze-resistant lubricant injection pump 2, the outlet of the freeze-resistant lubricant injection pump 2 is communicated with the inlet of the freeze-resistant lubricant buffer tank 3, the outlet of the freeze-resistant lubricant buffer tank 3 is communicated with the inlet of the freeze-resistant lubricant outlet valve 4, and the outlet of the CO2 exhaust pipe inlet filter 7 is communicated with the inlet of the CO2 exhaust valve 8 after being converged by the outlet pipe of the freeze-resistant lubricant outlet valve 4.
The freeze-resistant lubricant in the freeze-resistant lubricant storage tank 1 adopts a low freezing point and low volatile point organic working medium.
The outlet of the freeze-proof lubricant buffer tank 3 is provided with a bypass which is communicated with the inlet of the freeze-proof lubricant bypass valve 5, and the outlet of the freeze-proof lubricant bypass valve 5 is communicated with the bypass inlet of the freeze-proof lubricant storage tank 1.
According to the working method of the anti-icing system for the rapid and safe emission of the supercritical CO2 power generation system, when an accident working condition or an emergency working condition occurs and a large amount of CO2 in the supercritical CO2 power generation system needs to be rapidly emitted, the anti-icing lubricant outlet valve 4 is firstly opened, the anti-icing lubricant is injected into the main pipeline, and then the CO2 exhaust valve 8 is opened, so that the CO2 working medium mixed with the anti-icing lubricant is discharged out of the supercritical CO2 power generation system;
and when the pressure is low, the freeze-resistant lubricant injection pump 2 is started to supplement the freeze-resistant lubricant, and when the pressure is high, the freeze-resistant lubricant bypass valve 5 is opened, so that the freeze-resistant lubricant is discharged from the freeze-resistant lubricant buffer tank 3 to enter the freeze-resistant lubricant storage tank 1 to reduce the pressure of the freeze-resistant lubricant buffer tank 3.
The pressure of the buffer tank 3 of the freeze-proof lubricant is always 0.1-0.2MPa higher than the inlet pressure of the exhaust pipe of the CO2 working medium.
The invention has the following beneficial effects:
the anti-icing system and the method for the rapid and safe emission of the supercritical CO2 power generation system can monitor the system pressure at all times, ensure the supply of the anti-icing lubricant, also ensure that the anti-icing lubricant is not mixed into the system, effectively prevent the generation of dry ice when the carbon dioxide is rapidly depressurized and cooled by the throttle components such as the valve, the pipe orifice and the like, block the valve and the pipeline, ensure the rapid emission of the carbon dioxide and also ensure that the valve is not damaged during the emergency construction working condition.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the anti-icing system for rapid and safe emission of a supercritical CO2 power generation system according to the present invention comprises: the anti-freezing lubricant storage tank 1, the anti-freezing lubricant injection pump 2, the anti-freezing lubricant buffer tank 3, the anti-freezing lubricant outlet valve 4, the anti-freezing lubricant bypass valve 5, the CO2 exhaust pipeline inlet check valve 6, the CO2 exhaust pipeline inlet filter 7 and the CO2 exhaust valve 8, wherein an exhaust pipe inlet which is required to rapidly discharge CO2 working medium under emergency or accident conditions is firstly communicated with the inlet of the CO2 exhaust pipeline inlet check valve 6, the outlet of the CO2 exhaust pipeline inlet check valve 6 is further communicated with the inlet of the CO2 exhaust pipeline inlet filter 7, the outlet of the CO2 exhaust pipeline inlet filter 7 is communicated with the inlet of the CO2 exhaust valve 8, the outlet of the CO2 exhaust valve 8 is communicated with the exhaust pipe outlet of the CO2 working medium, the outlet of the anti-freezing lubricant storage tank 1 is communicated with the inlet of the anti-freezing lubricant injection pump 2, the outlet of the anti-freezing lubricant buffer tank 3 is communicated with the inlet of the anti-freezing lubricant outlet valve 4, and the outlet of the anti-freezing lubricant outlet valve 4 is communicated with the outlet of the CO2 exhaust pipeline inlet filter 7 and then converged with the CO2 exhaust valve 8.
As a preferred embodiment of the present invention, the outlet of the freeze-protected lubricant buffer tank 3 has a bypass in communication with the inlet of the freeze-protected lubricant bypass valve 5, and the outlet of the freeze-protected lubricant bypass valve 5 is in communication with the bypass inlet of the freeze-protected lubricant reservoir 1.
As a preferred embodiment of the present invention, the freeze-resistant lubricant in the freeze-resistant lubricant storage tank 1 adopts a low freezing point and low volatile point organic working medium, such as silicone oil substances (methyl silicone oil 201-5, etc.).
The working method of the anti-icing system for the rapid and safe emission of the supercritical CO2 power generation system comprises the following steps:
when an accident working condition or an emergency working condition occurs and a large amount of CO2 in the supercritical CO2 power generation system needs to be discharged rapidly, the freeze-blocking lubricant outlet valve 4 is opened first, the freeze-blocking lubricant is injected into the main pipeline, and then the CO2 exhaust valve 8 is opened, so that the CO2 working medium mixed with the freeze-blocking lubricant is discharged out of the supercritical CO2 power generation system.
And the freeze-resistant lubrication system connected with the anti-icing system monitors the inlet pressure of the exhaust pipe of the CO2 working medium in real time under normal working conditions, adjusts the pressure of the freeze-resistant lubricant buffer tank 3 according to the pressure, so that the pressure is always slightly higher than the inlet pressure of the exhaust pipe of the CO2 working medium, and when the pressure is low, the freeze-resistant lubricant injection pump 2 is started to supplement the freeze-resistant lubricant, and when the pressure is high, the freeze-resistant lubricant bypass valve 5 is started.
As a preferred embodiment of the invention, the pressure of the freeze-proof lubricant buffer tank 3 is always higher than the inlet pressure of the exhaust pipe of the CO2 working medium, such as silicone oil substances (methyl silicone oil 201-5 and the like).
The above detailed description is only of the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications according to the claims of the present invention are intended to fall within the scope of the present invention.
Claims (4)
1. An anti-icing system for rapid and safe discharge of a supercritical CO2 power generation system, comprising: the anti-freezing lubricant storage tank (1), the anti-freezing lubricant injection pump (2), the anti-freezing lubricant buffer tank (3), the anti-freezing lubricant outlet valve (4), the anti-freezing lubricant bypass valve (5), the CO2 exhaust pipeline inlet check valve (6), the CO2 exhaust pipeline inlet filter (7) and the CO2 exhaust valve (8), wherein an exhaust pipe inlet which is required to rapidly discharge CO2 working medium is communicated with the inlet of the CO2 exhaust pipeline inlet check valve (6) under emergency working conditions or accident working conditions, the outlet of the CO2 exhaust pipeline inlet check valve (6) is communicated with the inlet of the CO2 exhaust pipeline inlet filter (7), the outlet of the CO2 exhaust pipeline inlet filter (7) is communicated with the inlet of the CO2 exhaust valve (8), the outlet of the CO2 exhaust valve (8) is communicated with the inlet of the CO2 working medium exhaust pipe inlet of the anti-freezing lubricant storage tank (1), the outlet of the anti-freezing lubricant injection pump (2) is communicated with the inlet of the anti-freezing lubricant buffer tank (3), the outlet of the anti-freezing lubricant buffer tank (3) is communicated with the inlet of the CO2 exhaust valve inlet (4), and the outlet of the anti-freezing lubricant buffer tank (4) is communicated with the CO2 outlet (8);
the outlet of the freeze-resistant lubricant buffer tank (3) is provided with a bypass which is communicated with the inlet of the freeze-resistant lubricant bypass valve (5), and the outlet of the freeze-resistant lubricant bypass valve (5) is communicated with the bypass inlet of the freeze-resistant lubricant storage tank (1);
and when the pressure is low, the freeze-resistant lubricant injection pump (2) is started to supplement the freeze-resistant lubricant, and when the pressure is high, the freeze-resistant lubricant bypass valve (5) is opened.
2. An anti-icing system for rapid and safe discharge of supercritical CO2 power generation system according to claim 1, characterized in that the anti-freeze lubricant in the anti-freeze lubricant storage tank (1) employs a low freezing point, low volatile point organic working medium.
3. A method of operating an anti-icing system for the rapid and safe discharge of a supercritical CO2 power generation system according to claim 1 or 2, characterized in that when an accident or emergency situation arises, requiring rapid discharge of a large amount of CO2 in the supercritical CO2 power generation system, the freeze-blocking lubricant outlet valve (4) is first opened, the freeze-blocking lubricant is injected into the main conduit, and then the CO2 exhaust valve (8) is opened, such that CO2 working medium mixed with the freeze-blocking lubricant is discharged out of the supercritical CO2 power generation system;
and when the pressure is low, the freeze-resistant lubricant injection pump (2) is started to supplement the freeze-resistant lubricant, and when the pressure is high, the freeze-resistant lubricant bypass valve (5) is opened, so that the freeze-resistant lubricant is discharged from the freeze-resistant lubricant buffer tank (3) to enter the freeze-resistant lubricant storage tank (1) to reduce the pressure of the freeze-resistant lubricant buffer tank (3).
4. A working method according to claim 3, characterized in that the pressure of the freeze-proof lubricant buffer tank (3) is always 0.1-0.2MPa higher than the inlet pressure of the exhaust pipe of the CO2 working medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583084.9A CN110242860B (en) | 2019-07-01 | 2019-07-01 | Anti-icing system and method for rapid and safe emission of supercritical CO2 power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583084.9A CN110242860B (en) | 2019-07-01 | 2019-07-01 | Anti-icing system and method for rapid and safe emission of supercritical CO2 power generation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110242860A CN110242860A (en) | 2019-09-17 |
| CN110242860B true CN110242860B (en) | 2024-04-05 |
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| CN201910583084.9A Active CN110242860B (en) | 2019-07-01 | 2019-07-01 | Anti-icing system and method for rapid and safe emission of supercritical CO2 power generation system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110848572A (en) * | 2019-11-20 | 2020-02-28 | 华陆工程科技有限责任公司 | For supercritical CO2Anti-icing system and method for safe discharge of power generation system |
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| JP2014101241A (en) * | 2012-11-19 | 2014-06-05 | Japan Organo Co Ltd | System and method for feeding purified carbon dioxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8596075B2 (en) * | 2009-02-26 | 2013-12-03 | Palmer Labs, Llc | System and method for high efficiency power generation using a carbon dioxide circulating working fluid |
| US10519043B2 (en) * | 2017-06-01 | 2019-12-31 | Xi'an Jiaotong University | Control system for decreasing pressure of supercritical water system and method thereof |
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2019
- 2019-07-01 CN CN201910583084.9A patent/CN110242860B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014101241A (en) * | 2012-11-19 | 2014-06-05 | Japan Organo Co Ltd | System and method for feeding purified carbon dioxide |
| CN203848001U (en) * | 2014-05-24 | 2014-09-24 | 智胜化工股份有限公司 | Low-negative-pressure buffering tank bypass drainage device |
| WO2016153692A1 (en) * | 2015-03-25 | 2016-09-29 | Westinghouse Electric Company Llc | A versatile pinch point avoidance recuperator for supercritical carbon dioxide power generation systems |
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| CN109945156A (en) * | 2019-04-12 | 2019-06-28 | 西安热工研究院有限公司 | The supercritical CO for reducing Working fluid flow resistance is bypassed by working medium2Boiler system and method |
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| CN110242860A (en) | 2019-09-17 |
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