CN204437697U - LNG low-temperature storage tank voltage-stabilizing protection device - Google Patents
LNG low-temperature storage tank voltage-stabilizing protection device Download PDFInfo
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- CN204437697U CN204437697U CN201520100866.XU CN201520100866U CN204437697U CN 204437697 U CN204437697 U CN 204437697U CN 201520100866 U CN201520100866 U CN 201520100866U CN 204437697 U CN204437697 U CN 204437697U
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- storage tank
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Abstract
The utility model relates to liquefied coal bed device of air, is specifically related to a kind of LNG low-temperature storage tank voltage-stabilizing protection device.The technical problem solved is the safe and stable operation of storage tank, keeps the problem of modest pressure.Comprise DCS control gear, pressure transmitter, emergency relief valve, automatic decompression valve group, fluid manually operated valve, go out hydraulic control valve, air heater, storage tank, pressure transmitter, emergency relief valve, automatic decompression valve group is provided with above described storage tank, be provided with below described storage tank fluid manually, fluid manually operated valve passes through hydraulic control valve and connects air heater, the air heater the other end is connected with storage tank.The utility model is when pressure of storage tank fluctuates, and the storage tank avoiding pressure surge to cause is under-voltage or superpressure phenomenon, thus guarantees that storage tank normal table runs, and reduces the security risk of LNG storage tank.
Description
Technical field
The utility model relates to liquefied coal bed device of air, is specifically related to a kind of LNG low-temperature storage tank voltage-stabilizing protection device.
Background technique
The history that to take coal as main energy sources be based on China's energy development, single Coal Energy Source not only causes serious environmental pollution, and can restrict China's rapid development of economy.There is abundant coal bed gas resource in China, therefore develops coal bed gas resource, not only can make up coal supply breach, and can improve energy quality.Development of natural gas resource, Optimization of Energy Structure has become the important component part of Chinese energy safety strategy.But restriction cbm development utilize reason have: the distribution of coal-seam gas gas well away from large-scale industrial district, away from residential belt, big city; The distribution of gas well large size, do not concentrate, source of the gas can not form scale; Well yield is large not, and reserves are limited, can the productive life short.And be difficult to long distance delivery.Solve the way of coal-seam gas long distance transportation: lay feed channel at a distance, huge investment; Normal temperature high voltage gas cylinder vehicle-mounted transport---" iron and steel transport ", cost is too high; What cost was minimum is the transport of low-temperature atmosphere-pressure liquefaction tank car.The advantage of coal gas gasification: with special LNG tank car, steamer, the rock gas of outlying, desert, marine dispersion, carry out long-distance transportation to market through post liquefaction, it can save great amount of investment than pipeline gas transmission, and convenient and reliable, risk is little, strong adaptability.Efficiency of storage is high, take up an area less, less investment.Be conducive to the balance adjustment of city load.After some popularizations, because civilian tolerance winter use is many, summer grade is few, or because undergoing technological transformation with the maintenance of the chemical plant of gas or natural gas plant itself, or even gas line network is out of order, the imbalance of regular or irregular air feed is caused in capital, and builds the effect that LNG storage tank just can play peak load shifting.The cold recoverable discharged in production process.Low-temperature liquefaction also separable go out the useful by-product of part.LNG can be used as the vehicle fuel of high-quality.Compared with burning gasoline with automobile, it has, and octane value is high, antiknock quality good, burning is complete, exhaust pollution is few, engine life is long, reduce the advantages such as cost of transportation; Production and application is safer.Be conducive to environmental protection, reduce municipal pollution.The advantage that coal gas gasification stores: Large LNG storage tank can reach 7,000 ~ 200,000 cubic metre of LNG Liquefied natural gas, small-sized LNG storage tank can deposit 5 ~ 50 cubic metres of LNG Liquefied natural gas, LNG Liquefied natural gas just again can become gaseous state through simple gasification dress Ge and use, and the rock gas of liquefied storage may be used for urban pipe network and solves a peak regulation difficult problem for Natural Gas Power Plant.It is large that coal gas gasification overcomes long-distance pipeline installation cost, and covering area is limited, and do not possess the shortcoming of storage and peak modulation capacity.
In coal gas gasification plant area, fluid storage is all stored in special LNG storage tank, and LNG storage tank is very strict to the requirement storing pressure, if overpressure, may cause storing feed liquor, storage tank may be caused time serious to break, leak in a large number, if hypotony, storage tank negative pressure can be caused to be inhaled by tank skin flat, in order to ensure LNG storage tank safe and stable operation, need the stable-pressure device preventing low pressure or superpressure to be installed on hazardous chemical storage tank, to ensure the safe and stable operation of storage tank.
Summary of the invention
The technical problems to be solved in the utility model is the safe and stable operation of storage tank, keeps the problem of modest pressure, provides a kind of LNG storage tank voltage-stabilizing protection device.
The technical solution of the utility model is: a kind of LNG low-temperature storage tank voltage-stabilizing protection device, comprise DCS control gear 1, pressure transmitter 2, emergency relief valve 3, automatic decompression valve group 4, fluid manually operated valve 5, go out hydraulic control valve 6, air heater 7, storage tank 8, pressure transmitter 2 is provided with above described storage tank 8, emergency relief valve 3, automatic decompression valve group 4, fluid manually operated valve 5 is provided with below described storage tank 8, fluid manually operated valve 5 passes through hydraulic control valve 6 and connects air heater 7, air heater 7 the other end is connected with storage tank 8, described pressure transmitter 2, automatic decompression valve group 4, go out hydraulic control valve 6 and jointly connect DCS control gear 1 by guide line.
Described fluid manually operated valve, go out hydraulic control valve, air heater is pressurization system: be arranged on storage tank outer bottom, for the protection that storage tank is under-voltage.Described pressure transmitter, emergency relief valve, automatic decompression valve group composition pressure relief system: be arranged on the outer top of storage tank.Pressurization system, pressure relief system, DCS control system, by the combination of three cover systems, guarantee that pressure of storage tank is stabilized in range of working pressure.Compared with prior art, the utility model, when LNG low-temperature storage tank pressure is lower, by pressurization system, raises the pressure of storage tank; When pressure of storage tank is higher, reduced the pressure of storage tank by pressure relief system.Make the pressure of storage tank remain on (5 ~ 16kpa) in safe operating range, and eliminate LNG and occur the potential safety hazard that pressure anomaly causes.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation
In figure: 1, DCS control gear; 2, pressure transmitter; 3, emergency relief valve; 4, automatic decompression valve group; 5, fluid manually operated valve; 6, hydraulic control valve is gone out; 7, air heater; 8, storage tank.
Embodiment
In order to more clearly the technical solution of the utility model can be understood, below in conjunction with accompanying drawing, the utility model is further illustrated.
As shown in Fig. 1, a kind of LNG low-temperature storage tank voltage-stabilizing protection device, comprise DCS control gear 1, pressure transmitter 2, emergency relief valve 3, automatic decompression valve group 4, fluid manually operated valve 5, go out hydraulic control valve 6, air heater 7, storage tank 8, pressure transmitter 2 is provided with above described storage tank 8, emergency relief valve 3, automatic decompression valve group 4, fluid manually operated valve 5 is provided with below described storage tank 8, fluid manually operated valve 5 passes through hydraulic control valve 6 and connects air heater 7, air heater 7 the other end is connected with storage tank 8, described pressure transmitter 2, automatic decompression valve group 4, go out hydraulic control valve 6 and jointly connect DCS control gear 1 by guide line.
Described fluid manually operated valve 5, go out hydraulic control valve 6, air heater 7 is pressurization system: be arranged on storage tank outer bottom, for the protection that storage tank is under-voltage.When operator find that pressure of storage tank is lower, open LNG by DCS system 1 and go out hydraulic control valve 6, by LNG liquid import air vaporizers 7, after vaporizer, the pressure of LNG is 10Kpa, when pressure of storage tank normally after close LNG go out hydraulic control valve 5.
Described pressure transmitter 2, emergency relief valve 3, automatic decompression valve group 4 form pressure relief system: be arranged on the outer top of storage tank, for the overpressure protection of storage tank.When operator find that pressure of storage tank is higher (>=16Kpa), by the automatic decompression valve group 4 of DCS system 1 from tank top, by gas discharging unnecessary in storage tank to torch or emptying on the spot, when pressure of storage tank normally after close automatic decompression valve group 4.When pressure continues to raise, when automatic decompression valve group 4 can not discharge tank internal pressure in time, emergency relief valve 3 is started working.(when tank internal pressure is greater than 20Kpa, emergency relief valve 3 is automatically opened and tank inner pressure safety is released on the spot, and when pressure is less than 18Kpa, emergency relief valve 3 returns seat automatically)
Described DCS control gear 1 is arranged on control room, goes out hydraulic control valve 6 and automatic decompression valve group 4 for control LNG automatically.Comprise guide line, control cabinet, pressure transmitter 2.When pressure transmitter detects that pressure of storage tank exceeds normal operation range, (5-16Kpa) is by Signal transmissions to the DCS control cabinet 1 in control room, opens simultaneously or closes LNG go out hydraulic control valve 6 and automatic decompression valve group 4 according to actual setpoint.
The utility model has the advantages that, when pressure of storage tank fluctuates time, can be regulated and controled voluntarily by DCS control system 1, thus guarantee that pressure of storage tank is stabilized in certain interval.Eliminate the potential safety hazard that pressure surge causes simultaneously.
Claims (1)
1. a LNG low-temperature storage tank voltage-stabilizing protection device, it is characterized in that: comprise DCS control gear (1), pressure transmitter (2), emergency relief valve (3), automatic decompression valve group (4), fluid manually operated valve (5), go out hydraulic control valve (6), air heater (7), storage tank (8), described storage tank (8) top is provided with pressure transmitter (2), emergency relief valve (3), automatic decompression valve group (4), described storage tank (8) below is provided with fluid manually operated valve (5), fluid manually operated valve (5) passes through hydraulic control valve (6) and connects air heater (7), air heater (7) the other end is connected with storage tank (8), described pressure transmitter (2), automatic decompression valve group (4), go out hydraulic control valve (6) and jointly connect DCS control gear (1) by guide line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520100866.XU CN204437697U (en) | 2015-02-12 | 2015-02-12 | LNG low-temperature storage tank voltage-stabilizing protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520100866.XU CN204437697U (en) | 2015-02-12 | 2015-02-12 | LNG low-temperature storage tank voltage-stabilizing protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204437697U true CN204437697U (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520100866.XU Expired - Fee Related CN204437697U (en) | 2015-02-12 | 2015-02-12 | LNG low-temperature storage tank voltage-stabilizing protection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN204437697U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257977A (en) * | 2015-11-23 | 2016-01-20 | 江南工业集团有限公司 | Collecting and reutilizing device for bleeding gas of vehicle LNG gas cylinder |
| CN107420740A (en) * | 2017-08-07 | 2017-12-01 | 中国核工业第五建设有限公司 | Gas pressure control system in LNG tank |
-
2015
- 2015-02-12 CN CN201520100866.XU patent/CN204437697U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257977A (en) * | 2015-11-23 | 2016-01-20 | 江南工业集团有限公司 | Collecting and reutilizing device for bleeding gas of vehicle LNG gas cylinder |
| CN105257977B (en) * | 2015-11-23 | 2017-09-22 | 江南工业集团有限公司 | A kind of automobile-used LNG gas cylinders are released the collection reuse means of gas |
| CN107420740A (en) * | 2017-08-07 | 2017-12-01 | 中国核工业第五建设有限公司 | Gas pressure control system in LNG tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20160212 |