CN110617726A - Liquefied gas vaporization cold-storage system - Google Patents
Liquefied gas vaporization cold-storage system Download PDFInfo
- Publication number
- CN110617726A CN110617726A CN201910946700.2A CN201910946700A CN110617726A CN 110617726 A CN110617726 A CN 110617726A CN 201910946700 A CN201910946700 A CN 201910946700A CN 110617726 A CN110617726 A CN 110617726A
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- China
- Prior art keywords
- pipe
- liquid
- liquefied gas
- control valve
- cold accumulation
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
- F28D2020/0069—Distributing arrangements; Fluid deflecting means
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a liquefied gas vaporization cold accumulation system which is provided with a cold accumulation tank, a glycol pump, a heat exchanger, a liquid supplementing control valve, a flow control valve and a bypass control valve. Wherein, the cold storage tank is provided with a heat preservation layer, a coil pipe, a liquid pipe, a gas pipe, a liquid supplementing pipe, an overflow pipe, a liquid discharge pipe, a liquid supply pipe, a liquid return pipe, a thermometer and a liquid level meter; the liquid supply pipe is arranged at the bottom of the cold storage tank, a row of uniformly distributed small holes are formed in the upper semicircular part of the pipeline, the liquid return pipe is arranged at the top of the cold storage tank, and a row of uniformly distributed small holes are formed in the lower semicircular part of the pipeline. The water bath type vaporizer is adopted, so that the heat exchange effect and the stability of the vaporization of the liquefied gas are greatly improved; the cold storage tank can collect and store unstable vaporization cold energy, and ensure the safe, continuous and stable supply of the cold energy.
Description
Technical Field
The invention relates to a liquefied gas vaporization cold accumulation system, which can be used for the process of various factory buildings and civil buildings or the constant temperature water supply of air-conditioning chilled water, and belongs to the technical field of refrigeration.
Background
As shown in fig. 1, the conventional liquefied gas vaporization cold storage system is provided. Bulk gas (such as nitrogen, oxygen, etc.) is stored in liquefied gas storage tank, and low temperature liquid is stored. When gas is produced, liquefied gas is led into the vaporizer from the storage tank, the vaporizer is in an air bath type, namely natural convection heat exchange is carried out between outdoor air and low-temperature liquefied gas of the vaporizer, the liquefied gas absorbs heat in the air, is gasified, regulates the pressure to the pressure required by a user, and then supplies the gas. Many of the bulk gases used in plants are often produced by the vaporization of a liquefied gas in a gas storage tank, and the vaporization process is typically accomplished by an air bath vaporizer. The conventional air bath type vaporizer adopts outdoor air as a heat source, so that the heat exchange effect is unstable and poor due to unstable temperature and flow rate of the outdoor air; when the gas is continuously supplied, the evaporator is frosted and iced due to untimely heat exchange, the heat exchange effect is further deteriorated, and the sufficient gas demand is difficult to provide. On the other hand, the cold energy generated by the vaporization of the liquefied gas is lost outdoors and cannot be collected and utilized, and the process production or the personnel life of a factory needs to be specially equipped with a refrigerating unit to produce the process or air-conditioning chilled water, so that the equipment investment is huge. If the cold energy is recovered, the new problem of unstable cold energy recovery is faced because the cold energy changes along with the change of the gas consumption.
Disclosure of Invention
In order to solve the problems, the invention provides a liquefied gas vaporization cold accumulation system which comprises a cold accumulation tank, an ethylene glycol pump, a heat exchanger, a liquid supplementing control valve, a flow control valve and a bypass control valve. Wherein, the cold storage tank is provided with a heat preservation layer, a coil pipe, a liquid pipe, a gas pipe, a liquid supplementing pipe, an overflow pipe, a liquid discharge pipe, a liquid supply pipe, a liquid return pipe, a thermometer and a liquid level meter; the liquid supply pipe is arranged at the bottom of the cold storage tank, a row of uniformly distributed small holes are formed in the upper semicircular part of the pipeline, the liquid return pipe is arranged at the top of the cold storage tank, and a row of uniformly distributed small holes are formed in the lower semicircular part of the pipeline.
Preferably, the flow control valve is respectively connected with the inlet of the heat exchanger and the outlet of the glycol pump, and the bypass control valve is respectively connected with the inlet and the outlet of the heat exchanger.
Preferably, the medium circulating in the cold storage tank, the glycol pump and the heat exchanger is glycol solution, and the volume fraction of glycol in the glycol solution is 55-75%.
Preferably, the liquid supplementing control valve is controlled to be opened and closed by a liquid level meter of the cold storage tank, the liquid supplementing control valve is opened at a low liquid level, and the liquid supplementing control valve is closed at a high liquid level.
Preferably, the liquid supply pipe of the cold storage tank is connected to the bottom of the cold storage tank, a row of uniformly distributed small holes are formed in the upper semicircular part of the pipeline, the liquid return pipe is connected to the top of the cold storage tank, and a row of uniformly distributed small holes are formed in the lower semicircular part of the pipeline.
Preferably, a coil is arranged in the cold storage tank, and liquefied gas in the liquid tube enters from the bottom of the coil and is vaporized by countercurrent heat exchange with glycol solution in the cold storage tank, and then gas is output from a gas tube at the top of the coil.
Preferably, the overflow pipe of the cold storage tank is also used as a vent pipe to ensure that the pressure in the cold storage tank is atmospheric pressure.
Preferably, the primary side of the heat exchanger is provided with an ethylene glycol solution supply pipe and a return pipe, and the secondary side of the heat exchanger is provided with a chilled water supply pipe and a return pipe, so that countercurrent heat exchange is realized.
Preferably, the ethylene glycol pump is a variable frequency pump, and the circulation flow is adjusted according to the gas consumption of the liquefied gas.
The invention has the beneficial effects that: the water bath type vaporizer is not influenced by outdoor climate, and the vapor-liquid heat exchange greatly improves the heat exchange effect and stability of the vaporization of the liquefied gas; the cold storage tank can be used for collecting and storing unstable vaporization cold, the cold storage temperature can be reduced to-48 ℃ by using the glycol solution, high-grade cold is ensured, and the glycol solution system and the chilled water system are separated by using the heat exchanger, so that the safe, continuous and stable supply of the cold is ensured.
Drawings
FIG. 1 is a prior art liquefied gas vaporization cold storage system;
FIG. 2 is a liquefied gas vaporization cold storage system of the present invention;
FIG. 3 is the cold storage state of the liquefied gas vaporization cold storage system of the present invention;
fig. 4 shows the cooling state of the liquefied gas vaporization cold accumulation system of the invention.
Description of reference numerals:
1 is a liquid pipe, 2 is a gas pipe, 3 is a liquid supplementing pipe, 4 is a cold storage tank, 5 is a heat preservation layer, 6 is a thermometer, 7 is a liquid level meter, 8 is a liquid return pipe, 9 is a coil pipe, 10 is a liquid supply pipe, 11 is a liquid discharge pipe, 12 is a liquid supplementing control valve, 13 is an overflow pipe, 14 is an ethylene glycol pump, 15 is a heat exchanger, 16 is a flow control valve, 17 is a bypass control valve, 18 is a water supply pipe, and 19 is a water return pipe.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 2, the liquefied gas vaporization cold storage system includes a cold storage tank 4, a glycol pump 14, a heat exchanger 15, a liquid replenishment control valve 12, a flow control valve 16, and a bypass control valve 17. Wherein, the cold storage tank 4 is provided with a heat preservation layer 5, a coil pipe 9, a liquid pipe 1, a gas pipe 2, a liquid supplementing pipe 3, an overflow pipe 13, a liquid discharge pipe 11, a liquid supply pipe 10, a liquid return pipe 8, a thermometer 6 and a liquid level meter 7; the liquid supply pipe 10 is positioned at the bottom of the cold storage tank 4, a row of uniformly distributed small holes are formed in the upper semicircular part of the pipeline, the liquid return pipe 8 is positioned at the top of the cold storage tank 4, and a row of uniformly distributed small holes are formed in the lower semicircular part of the pipeline. The flow control valve 16 is respectively connected with the inlet of the heat exchanger 15 and the outlet of the ethylene glycol pump 14, and the bypass control valve 17 is respectively connected with the inlet and the outlet of the heat exchanger 15. The medium circulating in the cold storage tank 4, the glycol pump 14 and the heat exchanger 15 is glycol solution, and the volume fraction of glycol in the glycol solution is 55-75%. The opening and closing of the liquid supplementing control valve 12 are controlled by the liquid level meter 7 of the cold storage tank 4, the liquid supplementing control valve 12 is opened when the liquid level is low, and the liquid supplementing control valve 12 is closed when the liquid level is high. The coil pipe 9 is arranged in the cold storage tank 4, the liquefied gas in the liquid pipe 1 enters from the bottom of the coil pipe 9 and is vaporized by the countercurrent heat exchange with the glycol solution in the cold storage tank 4, and then the gas is output from the gas pipe at the top of the coil pipe 9. The overflow pipe 13 of the cool storage tank 4 also serves as a vent pipe to ensure atmospheric pressure in the cool storage tank 4. The heat exchanger 15 has a primary side provided with a glycol solution supply pipe 10 and a return pipe 8, and a secondary side provided with a chilled water supply pipe 18 and a return pipe 19, and performs countercurrent heat exchange. The ethylene glycol pump 14 is a variable frequency pump, and the circulation flow is adjusted according to the gas consumption of the liquefied gas.
Fig. 3 shows the medium flow direction when the liquefied gas vaporization cold accumulation system is in a cold accumulation state, wherein the flow control valve is closed, and the bypass control valve is opened. When the liquefied gas is used, the glycol pump is started, and the circulation flow is adjusted according to the gas consumption of the liquefied gas; the ethylene glycol solution at the bottom of the cold storage tank enters the liquid supply pipe through the uniformly distributed small holes, and returns to the top of the cold storage tank through the uniformly distributed small holes of the liquid return pipe by the ethylene glycol pump, so that the self-circulation of the ethylene glycol solution in the cold storage tank and the heat exchange of the coil pipe are completed. When the liquefied gas is not in use, the glycol pump is turned off.
Fig. 4 shows the medium flow direction in the cooling state of the liquefied gas vaporization cold accumulation system, at this time, the flow control valve is opened, the flow is adjusted according to the chilled water supply temperature, and the bypass control valve is opened. The glycol pump is started, glycol solution at the bottom of the cold accumulation tank enters the liquid supply pipe through the uniformly distributed small holes, the glycol solution passes through the glycol pump and then is divided into two paths, one path of the glycol solution exchanges heat with the primary side of the heat exchanger, and the flow is regulated through the flow control valve; the other path is mixed with the glycol solution after heat exchange through a bypass control valve and returns to the top of the cold storage tank through small holes uniformly distributed on a liquid return pipe.
Claims (9)
1. The liquefied gas vaporization cold storage system is characterized by comprising a cold storage tank (4), an ethylene glycol pump (14), a heat exchanger (15), a liquid supplementing control valve (12), a flow control valve (16) and a bypass control valve (17); wherein, the cold storage tank (4) is provided with a heat preservation layer (5), a coil pipe (9), a liquid pipe (1), a gas pipe (2), a liquid supplementing pipe (3), an overflow pipe (13), a liquid discharge pipe (11), a liquid supply pipe (10), a liquid return pipe (8), a thermometer (6) and a liquid level meter (7); the liquid supply pipe (10) is positioned at the bottom of the cold storage tank (4), a row of uniformly distributed small holes are formed in the upper semicircular part of the pipeline, the liquid return pipe (8) is positioned at the top of the cold storage tank (4), and a row of uniformly distributed small holes are formed in the lower semicircular part of the pipeline.
2. The liquefied gas vaporization cold accumulation system as claimed in claim 1, wherein the flow control valve (16) is connected to the inlet of the heat exchanger (15) and the outlet of the glycol pump (14), respectively, and the bypass control valve (17) is connected to the inlet and the outlet of the heat exchanger (15), respectively.
3. The liquefied gas vaporization cold accumulation system as claimed in claim 1, wherein the medium circulating in the cold accumulation tank (4), the glycol pump (14) and the heat exchanger (15) is glycol solution, and the glycol volume fraction in the glycol solution is 55-75%.
4. The liquefied gas vaporization cold accumulation system according to claim 1, wherein the opening and closing of the liquid supply control valve (12) is controlled by a liquid level meter (7) of the cold accumulation tank (4), the liquid supply control valve (12) is opened at a low liquid level, and the liquid supply control valve (12) is closed at a high liquid level.
5. The liquefied gas vaporization cold accumulation system as claimed in claim 1, wherein the liquid supply pipe (10) of the cold accumulation tank (4) is connected to the bottom of the cold accumulation tank (4), and a row of small holes are provided in the upper semicircular part of the pipeline, and the liquid return pipe (8) is connected to the top of the cold accumulation tank (4), and a row of small holes are provided in the lower semicircular part of the pipeline.
6. The liquefied gas vaporization cold accumulation system according to claim 1, wherein a coil (9) is arranged in the cold accumulation tank (4), and the liquefied gas in the liquid pipe (1) enters from the bottom of the coil (9) to be vaporized by the glycol solution in the cold accumulation tank (4) through countercurrent heat exchange and then is output from the gas pipe at the top of the coil (9).
7. The system for cold accumulation by vaporization of liquefied gas as claimed in claim 1, wherein the overflow pipe (13) of the cold accumulation tank (4) also serves as a vent pipe to ensure atmospheric pressure in the cold accumulation tank (4).
8. The liquefied gas vaporization cold accumulation system as claimed in claim 1, wherein the heat exchanger (15) comprises a primary side of a glycol solution supply pipe (10) and a return pipe (8), and a secondary side of a chilled water supply pipe (18) and a return pipe (19), and performs counter-current heat exchange.
9. The system as claimed in claim 1, wherein the glycol pump (14) is a variable frequency pump, and the circulation flow rate is adjusted according to the consumption of liquefied gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910946700.2A CN110617726A (en) | 2019-10-07 | 2019-10-07 | Liquefied gas vaporization cold-storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910946700.2A CN110617726A (en) | 2019-10-07 | 2019-10-07 | Liquefied gas vaporization cold-storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110617726A true CN110617726A (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910946700.2A Pending CN110617726A (en) | 2019-10-07 | 2019-10-07 | Liquefied gas vaporization cold-storage system |
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| Country | Link |
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| CN (1) | CN110617726A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397402A (en) * | 2020-04-20 | 2020-07-10 | 中机国能电力工程有限公司 | Waste heat recovery type cooling water system |
| CN114165729A (en) * | 2020-09-11 | 2022-03-11 | 安瑞科(廊坊)能源装备集成有限公司 | Online temperature adjusting device for LNG (liquefied Natural gas) filling and LNG filling method |
| CN114468413A (en) * | 2022-02-10 | 2022-05-13 | 广东技术师范大学 | Liquid-cooled air conditioning suit |
-
2019
- 2019-10-07 CN CN201910946700.2A patent/CN110617726A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397402A (en) * | 2020-04-20 | 2020-07-10 | 中机国能电力工程有限公司 | Waste heat recovery type cooling water system |
| CN114165729A (en) * | 2020-09-11 | 2022-03-11 | 安瑞科(廊坊)能源装备集成有限公司 | Online temperature adjusting device for LNG (liquefied Natural gas) filling and LNG filling method |
| CN114165729B (en) * | 2020-09-11 | 2024-05-17 | 安瑞科(廊坊)能源装备集成有限公司 | Online temperature adjusting device for LNG filling and LNG filling method |
| CN114468413A (en) * | 2022-02-10 | 2022-05-13 | 广东技术师范大学 | Liquid-cooled air conditioning suit |
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