CN202082615U - Recovery system for gas emptied by high-pressure output pump in LNG (Liquefied Natural Gas) receiving terminal - Google Patents
Recovery system for gas emptied by high-pressure output pump in LNG (Liquefied Natural Gas) receiving terminal Download PDFInfo
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- CN202082615U CN202082615U CN 201120146918 CN201120146918U CN202082615U CN 202082615 U CN202082615 U CN 202082615U CN 201120146918 CN201120146918 CN 201120146918 CN 201120146918 U CN201120146918 U CN 201120146918U CN 202082615 U CN202082615 U CN 202082615U
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 82
- 239000007789 gas Substances 0.000 title claims abstract description 67
- 238000011084 recovery Methods 0.000 title abstract 2
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 239000012530 fluid Substances 0.000 claims description 38
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 101710179738 6,7-dimethyl-8-ribityllumazine synthase 1 Proteins 0.000 description 3
- 101710186608 Lipoyl synthase 1 Proteins 0.000 description 3
- 101710137584 Lipoyl synthase 1, chloroplastic Proteins 0.000 description 3
- 101710090391 Lipoyl synthase 1, mitochondrial Proteins 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 101150001783 fic1 gene Proteins 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a recovery system for gas emptied by a high-pressure output pump in an LNG (Liquefied Natural Gas) receiving terminal, which comprises an emptying vertical pipe, a liquid level control valve, a liquid level sensor, a liquid level controller, a liquid level switch and a boil off gas main pipe, wherein the bottom part of the emptying vertical pipe is connected with a low-pressure output main pipe, and the top part gas-phase output end of the emptying vertical pipe is connected with the boil off gas main pipe. When the emptying gas passes through the emptying vertical pipe, the liquid drops contained in the emptying air are agglutinated in the emptying vertical pipe, and enters the high-pressure output pump through the low-pressure output main pipe connected with an emptying pipeline, the emptying gas enters the boil off gas main pipe through the emptying vertical pipe, the liquid level control valve, the liquid level sensor and the liquid level switch are respectively arranged on the emptying vertical pipe, the liquid level controller is connected with the liquid control valve and the liquid level sensor, and the liquid level controller controls the opening degree of the liquid level control valve according to the sensed liquid level in the liquid level sensor.
Description
Technical field
The utility model relates to the LNG Liquefied natural gas field, in particular to a kind of LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system.
Background technique
LNG Liquefied natural gas (LNG, liquefied natural gas) is a kind of high-grade energy, has calorific value height, the little characteristics of combustion pollution.The major function of LNG Liquefied natural gas receiving station is to receive the LNG that the LNG ship comes by transport by sea, and with its storage and vaporization, obtains the gaseous natural gas product, and by gas distributing system to power plant and gas user air feed.LNG Liquefied natural gas receiving station generally includes LNG discharge system, LNG stocking system, boil-off gas (BOG, Boil Off Gas) processing system, LNG transporting system, LNG carburetion system, Utilities and auxiliary system.Because LNG exists with the liquid state below the normal pressure-160 ℃, in process of production, because volume displaced, the flash distillation in the process of bleeding, unload a ship of amount of heat, the rapid reduction of atmosphere environment pressure, LNG storage tank and other LNG equipment and LNG pipeline can produce a certain amount of BOG.LNG high pressure rear pump adopts the latent liquid type centrifugal pump usually, be installed in the special pump jar, the high pressure rear pump in the running, the BOG of generation will accumulate in the pump jar, must be by the blow-down pipe discharging of pump tank top, to keep stable, the running continuously of high pressure rear pump.Owing to be rich in methane and carry a certain amount of drop secretly among the BOG, therefore need to recycle.Present technology, the emptying gas of high pressure rear pump is disposed to after-condenser and reclaims, but after-condenser belongs to the static equipment of pressure container type, generally in receiving station, only be provided with one, therefore, when after-condenser overhauled or safeguards, the emptying gas of high pressure rear pump need pass through the decompression of restriction orifice, and was disposed to the LNG storage tank or directly is disposed to flare system by low pressure emptying house steward.
The deficiency of existing way is: be discharged into the LNG storage tank by low pressure emptying house steward, because the LNG pressure of storage tank is low, near normal pressure, thereby cause the LNG liquid flashes of carrying secretly in the emptying gas to gasify, directly become the BOG of normal pressure, cause the bigger waste of energy, also brought the increase of BOG compressor operating load; In addition, owing to the variation of the BOG gas flow in the high pressure rear pump, cause the Selection and Design difficulty of restriction orifice, and the operation of the instability in the running, thereby have influence on the safe and stable operation of LNG high pressure rear pump, and then have influence on the stable operation of whole LNG receiving station; Simultaneously that the control action of flow be can not show a candle to control valve is accurate for restriction orifice, regulates flow by the fluid level control valve of band fluid level controller, can make system's operation of stable state equally when after-condenser is online and not online.
The model utility content
The utility model provides a kind of LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system, in order to when after-condenser overhauls or safeguards, to reclaim the BOG that produces in the high pressure rear pump running, keep the continous-stable operation of high pressure rear pump and LNG receiving station.
For achieving the above object, the utility model provides a kind of LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system, it comprises: the emptying standpipe, fluid level control valve, liquid level sensor, fluid level controller, liquid-level switch and boil-off gas house steward, wherein, the bottom of emptying standpipe is connected with the low pressure delivery trunk, its top gas phase output terminal is connected with the boil-off gas house steward, when emptying gas process emptying standpipe, the droplets entrained aggegation is in the emptying standpipe in the emptying gas, and entering the high pressure rear pump through the low pressure delivery trunk that links to each other with blow-down pipe, emptying gas enters the boil-off gas house steward through the emptying standpipe; Fluid level control valve, liquid level sensor and liquid-level switch are separately positioned on the emptying standpipe, fluid level controller is connected with liquid level sensor with fluid level control valve respectively, the aperture of the liquid level control fluid level control valve in the emptying standpipe that fluid level controller records according to liquid level sensor.
Preferable, above-mentioned reclaiming system also comprises: the lead sealing manually-operated gate is arranged on the two ends root of emptying standpipe.
Preferable, above-mentioned reclaiming system also comprises: Emergeny Cutoff Valves is arranged on the top of emptying standpipe, and is connected with liquid-level switch.
Preferable, above-mentioned reclaiming system also comprises: safety valve is arranged on the gas-phase space of emptying riser upper.
In the above-described embodiments, made up the bypath system of after-condenser by the emptying standpipe, emptying gas from the entrained drip of high pressure rear pump at first is disposed to the emptying standpipe, after the suitable waiting time, realize gas-liquid separation, gas is disposed to house steward BOG through fluid level control valve, liquid flows to the high pressure rear pump through the LNG export pipeline, when after-condenser overhauls or safeguards, realized the safe and stable operation of high pressure rear pump, and realize the effective recycling of its emptying gas, also realized the continous-stable operation of LNG Liquefied natural gas receiving station simultaneously.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, to do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is an embodiment's of the utility model a LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system schematic representation.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technological scheme among the utility model embodiment is carried out clear, complete description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not paying the every other embodiment who is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is an embodiment's of the utility model a LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system schematic representation.As shown in Figure 1, it comprises: fluid level control valve LCV-1, emptying standpipe 1, liquid level sensor LT-1, fluid level controller LIC-1 and liquid-level switch LS-1, wherein,
Emptying standpipe 1 is the thinner structure in middle thick two, when the emptying gas from the high pressure rear pump passes through emptying standpipe 1, the droplets entrained aggegation is in emptying standpipe 1 in the emptying gas, and the LNG delivery main through linking to each other with emptying standpipe 1 enters the high pressure rear pump;
The bottom of emptying standpipe 1 is connected with the LNG delivery trunk, and being connected of realization and high pressure rear pump; Fluid level control valve LCV-1, liquid level sensor LT-1, liquid-level switch LS-1 are installed on the emptying standpipe 1, and fluid level controller LIC-1 links to each other with fluid level controller LIC-1 with liquid level sensor LT-1 respectively;
The top gas phase output terminal of emptying standpipe 1 is connected with house steward BOG, and emptying gas enters the boil-off gas house steward through the emptying standpipe, and air displacement is controlled by the aperture of fluid level control valve LCV-1 in predetermined range keeping emptying standpipe liquid level;
The top in the thick stage casing of emptying standpipe 1 is provided with on the blow-down pipe that pipeline is connected to the high pressure rear pump, and the cutting-off valve that manual lead sealing is closed is set;
The emptying standpipe requires vertical the installation, and the setting height(from bottom) of the bottom in thick stage casing will be higher than after-condenser top tangent line with the bottom tangent line top setting height(from bottom) identical, thick stage casing of after-condenser, and general recommendations exceeds 1～2 meter.
In the present embodiment, made up the bypath system of after-condenser by the emptying standpipe, emptying gas from the entrained drip of high pressure rear pump at first is disposed to the emptying standpipe, after the suitable waiting time, realize gas-liquid separation, gas is disposed to house steward BOG through fluid level control valve, liquid flows to the high pressure rear pump through the LNG export pipeline, when after-condenser overhauls or safeguards, realized the safe and stable operation of high pressure rear pump, and realize the effective recycling of its emptying gas, also realized the continous-stable operation of LNG Liquefied natural gas receiving station simultaneously.
Wherein, the emptying standpipe is the thinner structure in middle thick two, setting height(from bottom) is according to the height decision of after-condenser, the operation liquid level is decided by the normal liquid level of after-condenser, because its form characteristics, emptying gas from high-pressure service pump stays for some time in the emptying standpipe, and the emptying standpipe has certain separatory effect, has guaranteed that droplets entrained can not enter house steward BOG in the high pressure pump housing emptying gas stream; Adopted fluid level controller and fluid level control valve, guaranteed that also BOG can not enter the high pressure rear pump, the standpipe of emptying simultaneously has the liquid level regulating action of certain limit because the intermediate portion caliber is thicker, can make liquid level control more flexible effectively.
For example, above-mentioned LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system also comprises:
The lead sealing manually-operated gate is arranged on the pipeline of the two ends root of emptying standpipe and emptying standpipe and high pressure rear pump blow-down pipe, and bypass is opened by mistake when preventing that after-condenser is online.
For example, above-mentioned LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system also comprises:
Emergeny Cutoff Valves ESD-1; be arranged on the top of emptying standpipe; close manually-operated gate near lead sealing; and link to each other with liquid-level switch TS-1, when the liquid level in the emptying standpipe surpassed predefined high liquid level numerical value, TS-1 sent liquid level superelevation signal; require interlocking close Emergeny Cutoff Valves ESD-1; prevent that the liquid in the emptying standpipe from entering house steward BOG, the BOG compressor in the protection LNG Liquefied natural gas receiving station guarantees the Security of system.
For example, above-mentioned LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system also comprises:
Fluid level control valve and fluid level controller, the aperture of fluid level control valve is controlled by fluid level controller, when the liquid level in the emptying standpipe that liquid level sensor LT-1 records is higher than predefined numerical value, fluid level controller LIC-1 sends the signal that reduces the BOG emptying flow, and realizes by the aperture that turns down fluid level control valve LCV-1; When the liquid level in the emptying standpipe that liquid level sensor LT-1 records is lower than predefined numerical value, fluid level controller LIC-1 sends the signal that increases the BOG emptying flow, and by opening the aperture realization of big fluid level control valve LCV-1, liquid level basically identical in the time of can keeping liquid level in the emptying standpipe and after-condenser online thus, reach the effect of the flow of stable high voltage rear pump emptying gas, make system's uniform and stable operation when after-condenser is online and not online.
For example, above-mentioned LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system also comprises:
Safety valve PSV-1, be installed in the place of the top of emptying standpipe near fluid level control valve LCV-1, when the gaseous pressure in the emptying standpipe surpassed the setting pressure of described safety valve, safety valve was opened, over-pressure gas is disposed to house steward BOG, guarantees the safety of emptying riser systems.
In the above-described embodiments, when after-condenser need overhaul or safeguard, close high pressure pump housing emptying gas and be back to valve MV-4 on the after-condenser pipeline, close the outlet valve MV-5 of after-condenser bottom simultaneously, after-condenser is isolated from the process system of LNG Liquefied natural gas receiving station, open cut-off valve MV-1, MV-2 and MV-3 between emptying standpipe and house steward BOG, LNG export pipeline and the high pressure rear pump blow-down pipe, make high pressure rear pump emptying gas this bypath system of flowing through; Droplets entrained stays for some time in standpipe in the emptying gas, and realizes separatory, and liquid is assembled in the bottom of standpipe, forms certain liquid level, flows to the high pressure rear pump by the LNG delivery trunk then; The actual liquid level of the emptying standpipe that records according to liquid level sensor LT-1, the aperture of fluid level controller FIC-1 regulator solution level control valve LCV-1, reach the purpose of liquid level in the control emptying standpipe, can make the level of level stability when equaling the after-condenser normal running substantially in the emptying standpipe like this; When the liquid-level switch LS-1 that installs on the emptying standpipe measures liquid level when being higher than predefined numerical value,, guarantee that the LNG liquid in the emptying standpipe does not enter among house steward BOG by the Emergeny Cutoff Valves ESD-1 of PLC logic control system emergency cut-off emptying riser upper; In addition, the safety valve PSV-1 that installs on the emptying standpipe opens when pressure surpasses the safety valve setting value in standpipe, and the discharging over-pressure gas guarantees the Security of emptying riser systems.
As can be seen, the foregoing description of the present utility model has been realized following beneficial effect from the description of the foregoing description:
First, the emptying gas of the high pressure output pump housing has been realized gas-liquid separation by the emptying standpipe, gas is got back to house steward BOG, liquid turns back to the high pressure rear pump, rather than get back to the LNG storage tank, avoid LNG liquid flashes of carrying secretly in the emptying gas and the energy loss that gasifies and bring, reduced the operation energy consumption of LNG Liquefied natural gas receiving station effectively.
Second, adopt emptying gas directly to drain into LNG and need use restriction orifice, and because the emptying gas quantitative change scope of high pressure rear pump is bigger, cause the Selection and Design difficulty of restriction orifice, and the operation of the instability in the running, thereby have influence on the safe and stable operation of LNG high pressure rear pump, and then have influence on the stable operation of whole LNG receiving station; Simultaneously that the control action of flow be can not show a candle to control valve is accurate for restriction orifice, regulates flow by the fluid level control valve of band fluid level controller, can make system's operation of stable state equally when after-condenser is online and not online.
One of ordinary skill in the art will appreciate that: accompanying drawing is an embodiment's a schematic representation, and module in the accompanying drawing or flow process might not be that enforcement the utility model is necessary.
One of ordinary skill in the art will appreciate that: the module in the device among the embodiment can be described according to embodiment and be distributed in embodiment's the device, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
It should be noted that at last: above embodiment only in order to the explanation the technical solution of the utility model, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technological scheme that previous embodiment is put down in writing, and perhaps part technical characteristics wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the utility model embodiment technological scheme.
Claims (4)
1. a LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system is characterized in that, comprising: emptying standpipe, fluid level control valve, liquid level sensor, fluid level controller, liquid-level switch and boil-off gas house steward, wherein
The bottom of described emptying standpipe is connected with the low pressure delivery trunk, its top gas phase output terminal is connected with described boil-off gas house steward, when emptying gas during through described emptying standpipe, the droplets entrained aggegation is in described emptying standpipe in the emptying gas, and entering the high pressure rear pump through the low pressure delivery trunk that links to each other with described blow-down pipe, emptying gas enters described boil-off gas house steward through described emptying standpipe;
Described fluid level control valve, described liquid level sensor and described liquid-level switch are separately positioned on the described emptying standpipe, described fluid level controller is connected with described liquid level sensor with described fluid level control valve respectively, and the liquid level in the described emptying standpipe that described fluid level controller records according to described liquid level sensor is controlled the aperture of described fluid level control valve.
2. LNG Liquefied natural gas according to claim 1 receiving station high pressure rear pump emptying gas reclaiming system is characterized in that, also comprises:
The lead sealing manually-operated gate is arranged on the two ends root of described emptying standpipe.
3. LNG Liquefied natural gas according to claim 1 receiving station high pressure rear pump emptying gas reclaiming system is characterized in that, also comprises:
Emergeny Cutoff Valves is arranged on the top of described emptying standpipe, and is connected with described liquid-level switch.
4. according to each described LNG Liquefied natural gas receiving station high pressure rear pump emptying gas reclaiming system among the claim 1-3, it is characterized in that, also comprise:
Safety valve is arranged on the gas-phase space of described emptying riser upper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120146918 CN202082615U (en) | 2011-05-10 | 2011-05-10 | Recovery system for gas emptied by high-pressure output pump in LNG (Liquefied Natural Gas) receiving terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120146918 CN202082615U (en) | 2011-05-10 | 2011-05-10 | Recovery system for gas emptied by high-pressure output pump in LNG (Liquefied Natural Gas) receiving terminal |
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| CN202082615U true CN202082615U (en) | 2011-12-21 |
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| CN 201120146918 Expired - Lifetime CN202082615U (en) | 2011-05-10 | 2011-05-10 | Recovery system for gas emptied by high-pressure output pump in LNG (Liquefied Natural Gas) receiving terminal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383172A (en) * | 2013-04-12 | 2013-11-06 | 北京安珂罗工程技术有限公司 | Method and system for recycling mixed refrigerant |
| CN104019358A (en) * | 2014-05-14 | 2014-09-03 | 广东省佛山水泵厂有限公司 | Flare gas suction compressor series system |
| CN110307469A (en) * | 2019-07-24 | 2019-10-08 | 中国海洋石油集团有限公司 | A high-pressure pump system of an LNG receiving station and its control method |
| CN110945277A (en) * | 2017-07-28 | 2020-03-31 | 克里奥斯塔股份有限公司 | Method and device for storing liquefied gas in a container and for extracting boil-off gas from the container |
| CN111594760A (en) * | 2020-05-18 | 2020-08-28 | 西安长庆科技工程有限责任公司 | Integrated integrated device suitable for natural gas collection |
| CN111692518A (en) * | 2020-06-19 | 2020-09-22 | 青岛乐戈新能源科技有限公司 | Plunger pump drainage method and device for LNG (liquefied Natural gas) station |
-
2011
- 2011-05-10 CN CN 201120146918 patent/CN202082615U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383172A (en) * | 2013-04-12 | 2013-11-06 | 北京安珂罗工程技术有限公司 | Method and system for recycling mixed refrigerant |
| CN103383172B (en) * | 2013-04-12 | 2016-02-10 | 北京安珂罗工程技术有限公司 | A kind of method and system recycling azeotrope |
| CN104019358A (en) * | 2014-05-14 | 2014-09-03 | 广东省佛山水泵厂有限公司 | Flare gas suction compressor series system |
| CN104019358B (en) * | 2014-05-14 | 2016-08-17 | 广东肯富来泵业股份有限公司 | A kind of torch gas suction compressor train |
| CN110945277A (en) * | 2017-07-28 | 2020-03-31 | 克里奥斯塔股份有限公司 | Method and device for storing liquefied gas in a container and for extracting boil-off gas from the container |
| CN110945277B (en) * | 2017-07-28 | 2022-02-01 | 克里奥斯塔股份有限公司 | Method and device for storing liquefied gas in a container and for extracting boil-off gas from the container |
| CN110307469A (en) * | 2019-07-24 | 2019-10-08 | 中国海洋石油集团有限公司 | A high-pressure pump system of an LNG receiving station and its control method |
| CN110307469B (en) * | 2019-07-24 | 2024-10-29 | 中国海洋石油集团有限公司 | LNG receiving station high-pressure pump system and control method thereof |
| CN111594760A (en) * | 2020-05-18 | 2020-08-28 | 西安长庆科技工程有限责任公司 | Integrated integrated device suitable for natural gas collection |
| CN111692518A (en) * | 2020-06-19 | 2020-09-22 | 青岛乐戈新能源科技有限公司 | Plunger pump drainage method and device for LNG (liquefied Natural gas) station |
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Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: China National Petroleum Corporation Patentee after: China Global Engineering Co. Ltd. Address before: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee before: China National Petroleum Corporation Patentee before: China Huanqiu Engineering Co. |
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Granted publication date: 20111221 |
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