CN105371103B - A kind of combined type natural gas recovery system and method - Google Patents

A kind of combined type natural gas recovery system and method Download PDF

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Publication number
CN105371103B
CN105371103B CN201510643183.3A CN201510643183A CN105371103B CN 105371103 B CN105371103 B CN 105371103B CN 201510643183 A CN201510643183 A CN 201510643183A CN 105371103 B CN105371103 B CN 105371103B
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natural gas
gas
heat exchanger
surge tank
control valve
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CN105371103A (en
Inventor
黄维秋
徐先阳
刘鹏
周旭红
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Changzhou Yi Ting Environmental Protection Technology Co Ltd
Changzhou University
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Changzhou Yi Ting Environmental Protection Technology Co Ltd
Changzhou University
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/028—Special adaptations of indicating, measuring, or monitoring equipment having the volume as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
    • F17C2227/0344—Air cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/01—Intermediate tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/037—Handling leaked fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/044—Avoiding pollution or contamination

Abstract

The invention mainly relates to absorption method natural gas recovery system and method, system mainly includes：Blower fan, heat exchanger, surge tank, vavuum pump, natural gas compressor, ANG gas cylinders etc., inferior position of the present invention for compression, the security of liquefied natural gas and economy, it is proposed the high combined type natural gas recovery system of a kind of safe efficient, economy, automaticity, the system can make vehicular, mobile, easy to operate.The present invention is that natural gas is filled with surge tank, natural gas in surge tank is stored with middle be compressed in absorption type gas cylinder again, when ambient pressure is less than storage pressure, the desorbing gas supply external world can use as the energy, and absorption type gas cylinder is detachable, changes, and does not influence whole system continuous operation.The present invention has taken into full account the factors such as waste cold recovery, oxygen content monitoring.

Description

A kind of combined type natural gas recovery system and method
Technical field
The invention belongs to natural gas recovery technology field, especially comprising a kind of combined type natural gas recovery system, further relates to Absorption method natural gas recovery method.
Background technology
Oil field in accompanying natural gas gas caused by oil recovery process or natural gas line residual air and other natural gas leakages or Natural gas caused by discharge process, is directly discharged in air sometimes, the discharge of these natural gases, is not only degrading environment, Health is damaged, but also the wasting of resources and economic loss can be caused.In recent years, with both at home and abroad to environmental problem Attention, the discharge to organic gas has strict standard, and the recycling of organic gas increasingly seems important, to them Contamination control be always environmental worker research emphasis problem.
The storage of natural gas mainly has liquefied natural gas (LNG), compressed natural gas (CNG), absorbed natural gas (ANG) and day The modes such as right gas hydrate (NGH).It is non-because LNG storages require higher to storage tank, CNG pressure stores are larger, NGH forms speed It is often slow, and ANG is generally only needed under the conditions of maintaining normal temperature, mesolow, with CNG1/6 pressure (only needing single stage compress) just It is expected to realize the natural gas storing amount equivalent to CNG, therefore ANG stores safer energy-conservation.Influence Adsorption Natural Gas effect Factor mainly includes：(1) performance of the adsorbent.Typically require that adsorbent has larger specific surface area and equilibrium adsorption capacity；Have Good adsorptive selectivity；With certain mechanical strength and wearability；Stable performance, relatively low bed pressure drop, specific heat is big, passes Hot coefficient is big, and electrical conductivity is high；Service life length etc..(2) structure of adsorbent equipment.(3) desorption and regeneration technique.
Technique according to the invention feature retrieved domestic and foreign databases, and Chinese patent CN102826033A proposes a kind of move Dynamic formula natural gas recovery vehicle (including motor vehicle and storage tank) and mobile natural gas retracting device and its application method.Chinese patent A kind of method using pressure-variable adsorption that CN104357118A is related to reclaims methane from liquefied natural gas purifying column on-condensible gas and carried The method of methane recovery efficiency in high liquefied natural gas.Chinese patent CN103822091A proposes a kind of compressed natural gas filling Stand natural gas recoverying and utilizing method, available for CNG Filling Station, the several method generally existing hypertonia or pair set Standby condition requires the deficiencies of too high.The present invention proposes a kind of combined type natural gas recovery system and method, natural gas is filled with slow Rush in tank, then natural gas in surge tank is compressed in absorption type gas cylinder with middle pressure (being not higher than 4MPa) and stored, work as ambient pressure During less than storage pressure, desorbing gas supply is extraneous.
The content of the invention
It is an object of the invention to provide a kind of combined type natural gas recovery system and method, for compression, liquefied natural gas Security and economy inferior position, the present invention proposes a kind of safe efficient, economic combined type natural gas recovery system and side Method, the system can make vehicular, mobile, easy to operate, and natural gas is filled with surge tank by the present invention, then by surge tank Natural gas is stored with middle be compressed in absorption type gas cylinder, and when ambient pressure is less than storage pressure, desorbing gas supply is extraneous It can be used as the energy.
Technical scheme is as follows：
(1) a kind of combined type natural gas recovery system includes：Control valve, pressure sensor, thermometer, flowmeter, heat exchange Device A, heat exchanger B, oxygen measurement probe, temperature sensor, surge tank, vavuum pump, pressure vacuum vent valve, natural gas compressor, mistake Filter, ball valve, check valve, safety valve, pressure gauge, ANG gas cylinders and pipe fitting.
1. a kind of flowmeter of described combined type natural gas recovery system is used for recording the volume flow of natural gas and tired out Product volume flow.
2. a kind of heat exchanger of described combined type natural gas recovery system divides heat exchanger A and heat exchanger B.
Further, described heat exchanger A to configure when temperature degree is less than environment temperature in system for natural gas, and other make It can not be configured in the case of.Heat exchanger A is high-performance heat exchanger and thermal strain is small when difference variation is big, can bear >=5MPa pressures Power.Heat exchanger A outer wrapping heat-storing materials, major storage natural gas carry out the cold of gas, make to come gas and the heat exchange of heat exchanger B outlets.
Further, described heat exchanger B is air-cooled heat exchange, and it mainly drops natural gas compressor export gas temperature It is low.
3. air inlet, gas outlet, pressure biography are provided with the top of a kind of surge tank of described combined type natural gas recovery system Sensor, temperature sensor, oxygen measurement probe.
Further, described surge tank pressure-bearing >=5MPa.
Further, described oxygen measurement probe is when oxygen concentration is too high in surge tank, auto-changeover control valve (1, 27th, 10,14,16,17,19), open vavuum pump, by gas discharging in surge tank, improve security of system.
4. a kind of vavuum pump of described combined type natural gas recovery system is protected against explosion vavuum pump, it is mainly used in system The reduction system oxygen concentration that vacuumizes and meet an urgent need of surge tank, pipeline.
5. a kind of natural gas compressor of described combined type natural gas recovery system is frequency conversion type natural gas compressor, by Buffer pressure inside the tank size VFC natural gas compressor.
Further, described natural gas compressor outlet pressure is not higher than 5MPa.
6. the ball valve and safety valve of a kind of described combined type natural gas recovery system, are mainly used in pressure release, anti-locking system Internal pressure is excessive, triggers dangerous.
7. a kind of ANG gas cylinders of described combined type natural gas recovery system are built with natural gas Special adsorbent AdsFOV- IV, its specific surface area are 1500m2/ g~2800m2/ g, gas cylinder pressure-bearing >=5MPa.
Further, the natural gas Special adsorbent AdsFOV- IV has bigger serface, abundant microcellular structure, leads The features such as good in thermal property, perfect heat-dissipating, absorption and rapid desorption process cooling, it can be repeated more than 2000 times with adsorption-desorption.
Further, described ANG gas cylinders are full of rear replaceable ANG gas cylinders, and the ANG gas cylinders after being full of can be used as the energy just Often use.
(2) each equipment connection mode is as follows in a kind of combined type natural gas recovery system：
It is connected 1. natural gas carrys out gas pipeline with flowmeter entrance.
2. flowmeter outlet is connected with heat exchanger A heat exchange pipeline entrances, the outlet of heat exchanger A heat exchange pipelines and buffering canister incoming gas Mouth connection.
3. buffer tank outlet is connected with natural gas compressor air inlet, air-inlet of vacuum pump.
4. natural gas compressor outlet is connected with heat exchanger B entrances, heat exchanger B outlets are connected with heat exchanger A air inlets.
5. heat exchanger A gas outlets are connected with filter inlet, filter outlet is connected with ANG gas cylinders.
(3) a kind of recovery method of combined type natural gas recovery system
1. system is first before use, control valve, unlatching vavuum pump, to surge tank and pipeline take out very using vavuum pump Sky, after exhausting vacuum, control valve.
Acted on 2. gas (natural gas or liquefied natural gas, gas temperature are not higher than environment temperature) is carried out at scene in system vacuum Under, enter heat exchanger A heat exchange pipelines by control valve, pressure sensor, flowmeter, natural gas carrys out the cold of gas in heat exchanger A Amount is stored by heat-storing material.
3. the natural gas come out from heat exchanger A heat exchange pipelines enters surge tank by control valve.
4. when gas pressure is higher than setting value -0.01MPa in surge tank, specific pressure set points are debugged according to the actual requirements When adjust, determine again) when, natural gas compressor start, control valve open, natural gas from buffer tank outlet by control valve, Compressed by natural gas compressor after flowmeter and cool after in heat exchanger B, then by heat exchanger A, it is cold in absorption heat-exchange device A Amount.
5. it is compressed to ANG gas cylinders by filter, control valve, check valve from the natural gas that heat exchanger A gas outlets come out It is interior.
6. when gas pressure is less than setting value -0.02MPa in surge tank, specific pressure set points are debugged according to the actual requirements When adjust, determine again) when, close natural gas compressor, control valve, using surge tank storage come gas.
7. after an ANG gas cylinders are full of, natural gas compressor is closed, control valve, continues to run with after changing ANG gas cylinders and is System.
8. when oxygen concentration is too high in surge tank, the various control valves that automatically switch, vavuum pump is opened, by surge tank Gas discharging, improve security of system.
(4) beneficial effects of the present invention
1. the present invention utilizes ANG storing technologies, relative to LNG is stored, CNG is stored, ANG storages are usual for NGH storages Only need under the conditions of maintaining normal temperature, mesolow, just be expected to realize equivalent to CNG with CNG1/6 pressure (only needing single stage compress) Natural gas storing amount, ANG stores safer energy-conservation, especially with high-performance adsorbent, greatly improve ANG gas cylinders Gas-storing capacity.
2. present invention recovery natural gas, and the natural gas after recovery can be continuing with as the energy, play environmental protection With the reduction wasting of resources and the effect of economic loss.
3. the present invention sets high-performance heat exchanger, take into full account that waste cold reclaims, further improve the gas-storing capacity of ANG gas cylinders.
4. the present invention sets heat exchanger, surge tank, frequency conversion type natural gas compressor, enable the system to consumption and substantially reduce, and Make system operatio more steady.
5. automaticity of the present invention is high, it is possible to achieve unattended operation, reduces labor intensity of operating staff, and improves System operation security.
6. the present invention can make vehicular, there is portable, mobile, removable, monitoring, touch screen control.
Brief description of the drawings
Accompanying drawing 1 is a kind of combined type natural gas recovery system flow chart.
Reference lists as follows：
1st, 10,14,16,17,19,27- control valves；2nd, 11,24- pressure sensors；3rd, 5,7,9,25- thermometers；4、20- Flowmeter；6- heat exchangers A；8- heat exchangers B；12- oxygen measurement probes；13- temperature sensors；15- surge tanks；18- vavuum pumps； 21- pressure vacuum vent valves；22- natural gas compressors；23- filters；26- ball valves；28- check valves；29- safety valves；30- pressure Table；31-ANG gas cylinders.
Embodiment
Embodiments of the invention are described further below in conjunction with accompanying drawing 1, but the present invention should not be limited by the examples：
To liquefied natural gas residual air recycling, gas flow 200m3/h, gas temperature is less than environment temperature, leads to Cross technical solution of the present invention and be described in detail with reference to accompanying drawing 1.
(1) a kind of combined type natural gas recovery system includes：Control valve (1,10,14,16,17,19,27), pressure sensing Device (2,11,24), thermometer (3,5,7,9,25), flowmeter (4,20), heat exchanger A (6), heat exchanger B (8), oxygen detection are visited Head (12), temperature sensor (13), surge tank (15), vavuum pump (18), pressure vacuum vent valve (21), natural gas compressor (22), Filter (23), ball valve (26), check valve (28), safety valve (29), pressure gauge (30), ANG gas cylinders (31) and pipe fitting.
1. a kind of flowmeter (4,20) of described combined type natural gas recovery system is used for recording the volume flow of natural gas Amount and cumulative volume flow.
2. a kind of heat exchanger of described combined type natural gas recovery system divides heat exchanger A (6) and heat exchanger B (8).
Further, described heat exchanger A (6) to configure when temperature degree is less than environment temperature in system for natural gas, its It can not be configured under his service condition.Heat exchanger A (6) is high-performance heat exchanger and thermal strain is small when difference variation is big, can bear >=5MPa pressure.Heat exchanger A (6) outer wrapping heat-storing material, major storage natural gas carry out the cold of gas, make to come gas and heat exchanger B (8) outlet exchanges heat.
Further, described heat exchanger B (8) is air-cooled heat exchange, and it mainly makes natural gas compressor (22) export gas Temperature reduces.
3. air inlet, gas outlet, pressure are provided with the top of a kind of surge tank (15) of described combined type natural gas recovery system Force snesor (11), temperature sensor (13), oxygen measurement probe (12).
Further, described surge tank (15) pressure-bearing >=5MPa.
Further, described oxygen measurement probe (12) automatically switches each when surge tank (15) interior oxygen concentration is too high Kind control valve, vavuum pump (18) is opened, by gas discharging in surge tank (15), improve security of system.
4. a kind of vavuum pump (18) of described combined type natural gas recovery system is protected against explosion vavuum pump, it is mainly used in pair The reduction system oxygen concentration that vacuumizes and meet an urgent need of system buffer tank (15), pipeline.
5. a kind of natural gas compressor (22) of described combined type natural gas recovery system is frequency conversion type natural gas compressing Machine, by the interior pressure size VFC natural gas compressor (22) of surge tank (15).
Further, described natural gas compressor (22) outlet pressure is not higher than 5MPa.
6. the ball valve (26) and safety valve (29) of a kind of described combined type natural gas recovery system, are mainly used in pressure release, Prevent that internal system pressure is excessive, trigger dangerous.
7. a kind of ANG gas cylinders (31) of described combined type natural gas recovery system are built with natural gas Special adsorbent AdsFOV- IV, its specific surface area are 1500m2/ g~2800m2/ g, gas cylinder (31) pressure-bearing >=5MPa.
Further, the natural gas Special adsorbent AdsFOV- IV has bigger serface, abundant microcellular structure, leads The features such as good in thermal property, perfect heat-dissipating, absorption and rapid desorption process cooling, it can be repeated more than 2000 times with adsorption-desorption.
Further, described ANG gas cylinders are full of rear replaceable ANG gas cylinders, and the ANG gas cylinders after being full of can be used as the energy just Often use.
(2) each equipment connection mode is as follows in a kind of combined type natural gas recovery system：
It is connected 1. natural gas carrys out gas pipeline with flowmeter (4) entrance.
2. flowmeter (4) outlet be connected with heat exchanger A (6) heat exchange pipeline entrance, heat exchanger A (6) heat exchange pipeline export and Surge tank (15) air inlet connects.
3. surge tank (15) gas outlet is connected with natural gas compressor (22) air inlet, vavuum pump (18) air inlet.
4. natural gas compressor (22) gas outlet is connected with heat exchanger B (8) entrance, heat exchanger B (8) outlets and heat exchanger A (6) air inlet connects.
5. heat exchanger A (6) gas outlets are connected with filter (23) entrance, filter (23) outlet connects with ANG gas cylinders (31) Connect.
(3) a kind of recovery method of combined type natural gas recovery system
1. system is first before use, closing control valve (1,17,27), closes ball valve (26), open control valve (10,14, 16th, 19), anti-explosion vacuum pump (18) is opened, surge tank (15) and pipeline are vacuumized using anti-explosion vacuum pump (18), exhausted After vacuum, closing control valve (14,16).
2. gas (liquefied natural gas residual air, gas flow 200m are come in scene3/ h, gas temperature are less than environment temperature) be Under vacuum of uniting effect, enter heat exchanger A (6) heat exchange pipeline by control valve (1), pressure sensor (2), flowmeter (4), The cold that heat exchanger A (6) interior natural gas carrys out gas is stored by heat-storing material.
3. the natural gas come out from heat exchanger A (6) heat exchange pipeline enters surge tank (15) by control valve (10).
4. when surge tank (15) interior gas pressure is higher than setting value -0.01MPa, natural gas compressor (22) starts, control Valve (14,17,27) processed is opened, and natural gas is from surge tank (15) gas outlet by control valve (14), control valve (17), flowmeter (20) compressed after by natural gas compressor (22) after cooling in heat exchanger B (8), then pass through heat exchanger A (6), absorption heat-exchange device A (6) cold in.
5. the natural gas come out from heat exchanger A (6) gas outlet passes through filter (23), control valve (27), check valve (28), It is compressed in ANG gas cylinders (31).
6. when surge tank (15) interior gas pressure is less than setting value -0.02MPa, natural gas compressor (22) is closed, is closed Control valve (14) is closed, is stored using surge tank (15) come gas.
7. after an ANG gas cylinders (31) are full of, natural gas compressor (22) is closed, closing control valve (14,27), is changed ANG gas cylinders continue to run with system after (31).
8. when surge tank (15) interior oxygen concentration reaches 0.5%~1%, automatically switch various valves, i.e. closing control Valve (1,17,27), ball valve (26) is closed, open control valve (10,14,16,19), anti-explosion vacuum pump (18) is opened, by surge tank (15) gas discharging in, oxygen concentration in the reduction system of meeting an urgent need, improves security of system.

Claims (9)

  1. A kind of 1. combined type natural gas recovery system, it is characterised in that：The system by control valve (1,10,14,16,17,19, 27), pressure sensor (2,11,24), thermometer (3,5,7,9,25), flowmeter (4,20), heat exchanger A (6), heat exchanger B (8), oxygen measurement probe (12), temperature sensor (13), surge tank (15), vavuum pump (18), pressure vacuum vent valve (21), natural Air compressor (22), filter (23), ball valve (26), check valve (28), safety valve (29), pressure gauge (30), ANG gas cylinders (31) And pipeline composition, natural gas carry out gas pipeline and be connected with flowmeter (4) entrance, flowmeter (4) outlet exchanges heat with heat exchanger A (6) Entrance connect, heat exchanger A (6) heat exchange pipeline outlet be connected with surge tank (15) air inlet, surge tank (15) gas outlet and Natural gas compressor (22) air inlet, the connection of vavuum pump (18) air inlet, natural gas compressor (22) gas outlet and heat exchanger B (8) entrance is connected, and heat exchanger B (8) outlets are connected with heat exchanger A (6) air inlet, heat exchanger A (6) gas outlets and filter (23) Entrance is connected, and filter (23) outlet is connected with ANG gas cylinders (31).
  2. A kind of 2. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：ANG gas cylinders (31) built with Natural gas Special adsorbent AdsFOV- IV, its specific surface area are 1500m2/ g~2800m2/ g, gas cylinder (31) pressure-bearing >=5MPa； ANG gas cylinders are full of rear replaceable ANG gas cylinders, and the ANG gas cylinders after being full of can be used as energy normal use.
  3. A kind of 3. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：Heat exchanger divides heat exchanger A (6) With heat exchanger B (8)；Heat exchanger A (6) to configure when temperature degree is less than environment temperature in system for natural gas；Heat exchanger A (6) For high-performance heat exchanger and when difference variation is big, thermal strain is small, can bear >=5MPa pressure；Heat exchanger A (6) outer wrapping accumulation of heat Material, the cold of gas is carried out for natural gas-storing, make to come gas and the heat exchange of heat exchanger B (8) outlet；Heat exchanger B (8) changes to be air-cooled Heat, it is used to make the reduction of natural gas compressor (22) export gas temperature.
  4. A kind of 4. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：It is provided with the top of surge tank (15) Air inlet, gas outlet, pressure sensor (11), temperature sensor (13), oxygen measurement probe (12)；Surge tank (15) pressure-bearing >= 5MPa。
  5. A kind of 5. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：Oxygen measurement probe (12) exists When surge tank (15) interior oxygen concentration is too high, auto-changeover control valve (1,27,10,14,16,17,19), vavuum pump is opened (18), by gas discharging in surge tank (15), security of system is improved.
  6. A kind of 6. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：Vavuum pump (18) is protected against explosion Vavuum pump, for system for the first time using the preceding reduction system oxygen concentration that vacuumizes and meet an urgent need to surge tank (15), pipeline.
  7. A kind of 7. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：Natural gas compressor (22) is Frequency conversion type natural gas compressor, by the interior pressure size VFC natural gas compressor (22) of surge tank (15), natural gas compressing Machine (22) outlet pressure is not higher than 5MPa.
  8. A kind of 8. combined type natural gas recovery system as claimed in claim 1, it is characterised in that：Ball valve (26) and safety valve (29) it is used for pressure release, prevents that internal system pressure is excessive, triggers dangerous.
  9. 9. a kind of recovery method of combined type natural gas recovery system as any one of claim 1-8, its feature exist In：System is first before use, closing control valve (1,27), closes ball valve (26), opening control valve (10,14,16,17,19), open Anti-explosion vacuum pump (18) is opened, surge tank (15) and pipeline are vacuumized using anti-explosion vacuum pump (18), after exhausting vacuum, is closed Close control valve (14,16)；Gas is carried out under system vacuum effect in scene, by control valve (1), pressure sensor (2), flowmeter (4) heat exchanger A (6) heat exchange pipeline is entered, it is natural gas or liquefied natural gas that gas is carried out at scene, and scene carrys out temperature degree and is not higher than environment Temperature, the cold that gas is carried out in heat exchanger A (6) interior natural gas are stored by heat-storing material；Come out from heat exchanger A (6) heat exchange pipeline Natural gas enters surge tank (15) by control valve (10)；When surge tank (15) interior gas pressure is higher than setting value -0.01MPa When, natural gas compressor (22) starts, and control valve (14,27) is opened, and natural gas passes through control valve from surge tank (15) gas outlet (14), compressed after cooling in heat exchanger B (8), then pass through by natural gas compressor (22) after control valve (17), flowmeter (20) Cold in heat exchanger A (6), absorption heat-exchange device A (6)；The natural gas come out from heat exchanger A (6) gas outlet passes through filter (23), control valve (27), check valve (28), it is compressed in ANG gas cylinders (31)；When surge tank (15) interior gas pressure is less than setting During value -0.02MPa, natural gas compressor (22) is closed, closing control valve (14), is stored using surge tank (15) come gas；When one After ANG gas cylinders (31) are full of, natural gas compressor (22) is closed, closing control valve (14,27), it is follow-up to change ANG gas cylinders (31) Continuous runtime；When oxygen concentration is too high in surge tank, closing control valve (1,27), ball valve (26) is closed, open control valve (10,14,16,17,19), anti-explosion vacuum pump (18) is opened, oxygen concentration in reduction system of meeting an urgent need.
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CN106085529A (en) * 2016-06-04 2016-11-09 常州大学 A kind of portable adsorption-type natural gas recycling device and method
CN106287208A (en) * 2016-09-27 2017-01-04 北京市燃气集团有限责任公司 A kind of natural gas scattered gas recoverable ANG of intelligence adsorbs bottle group device
CN108506730A (en) * 2018-05-09 2018-09-07 苏州卫鹏机电科技有限公司 A kind of air supply system and its air supply method
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CN203585805U (en) * 2013-08-22 2014-05-07 天津华迈燃气装备股份有限公司 Natural gas flashing vapour recovery device of liquefied natural gas (LNG) liquid adding station
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CN104806879A (en) * 2015-04-22 2015-07-29 四川金科深冷设备工程有限公司 BOG recovery system for LNG (Liquefied Natural Gas) gas station

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