CN202927488U - Low-temperature natural gas recycling and disposal device - Google Patents
Low-temperature natural gas recycling and disposal device Download PDFInfo
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- CN202927488U CN202927488U CN 201220688231 CN201220688231U CN202927488U CN 202927488 U CN202927488 U CN 202927488U CN 201220688231 CN201220688231 CN 201220688231 CN 201220688231 U CN201220688231 U CN 201220688231U CN 202927488 U CN202927488 U CN 202927488U
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Abstract
The utility model relates to a low-temperature natural gas recycling and disposal device comprising heat exchangers and a normal-temperature natural gas compressor. Natural gas inlet ends of the heat exchangers are connected with a low-temperature natural gas pipe; a natural gas inlet end of the normal-temperature natural gas compressor is connected with natural gas outlet ends of the heat exchangers; and a natural gas outlet end of the normal-temperature natural gas compressor is connected with a normal-temperature high-pressure natural gas pipe. The low-temperature natural gas recycling and disposal device is applicable to LNG (liquefied natural gas) receiving stations or LNG liquefaction factories, is strongly adaptive to gas composition, flow and pressure change, and is simple in structure and easy to maintain. A domestic normal-temperature natural gas compressor can be used for replacing an imported expensive low-temperature natural gas compressor, so that the investment of projects is saved.
Description
Technical field
The utility model relates to a kind of cryogenic natural gas recycling and processing device, is used for the cryogenic natural gas recycling of LNG Liquefied natural gas (LNG) receiving station, LNG Liquefied natural gas (LNG) liquefaction plant.
Background technique
Along with the development of China's economic, the demand of the energy is day by day increased, domestic LNG Liquefied natural gas use be in flourish in.For LNG Liquefied natural gas (LNG) receiving station, LNG liquefaction plant, because LNG storage tank, conveyance conduit unavoidably will absorb outside heat, produced a large amount of cryogenic natural gas.If can not effectively recycle cryogenic natural gas, directly with its discharging atmosphere, not only cause the pollution of environment, also cause the waste of the energy.
At present, in LNG receiving station, traditional cryogenic natural gas recovery process mainly adopts direct weighting output technique and recondensation process.Direct weighting output technique is to adopt the cryogenic natural gas compressor, and the low-temp low-pressure rock gas is pressurized to the normal temperature high voltage state, is delivered directly to the outer gas ductwork in station.Recondensation process is with the pressurization of the rock gas of low temperature, extracts LNG from the LNG storage tank again, and both are direct heat transfer in condensation more by a certain percentage, and cryogenic natural gas is liquefied again, is transported to the high-pressure service pump pressurized gasification.In these two kinds of techniques, the cryogenic natural gas compressor is the key equipment that cryogenic natural gas is recycled, and is related to main equipment---the normal safe operation of LNG storage tank.Present general low temperature oilless reciprocating or the labyrinth compressor of adopting, domestic Compressor Manufacturing factory there is no design, makes the mature experience of such compressor, main dependence on import, the device fabrication cycle is long, and manufacture cost is high.
Therefore, be necessary to design a kind of new cryogenic natural gas recycling and processing device in fact, with manufacture cycle and the cost that reduces former recycling.
The model utility content
The utility model provides a kind of new cryogenic natural gas recycling and processing device, pass through heater, cryogenic natural gas is heated to normal temperature, adopt again domestic normal-temperature natural-gas compressor to substitute the import cryogenic natural gas compressor that the manufacture cycle is long, manufacture cost is high normal-temperature natural-gas is compressed, thereby reach the purpose that reduces construction investment, shortens construction period.
To achieve these goals, cryogenic natural gas recycling and processing device of the present utility model can adopt following technological scheme.
The utility model provides a kind of cryogenic natural gas recycling and processing device, and this device comprises:
Heat exchanger, its Imported gas end is connected with the cryogenic natural gas pipeline, and
The normal-temperature natural-gas compressor, its Imported gas end is connected with the gas outlet end of described heat exchanger by pipeline, and its gas outlet end is connected with the normal temperature high voltage natural gas line.
In one embodiment, described heat exchanger is air temperature type heat exchanger (wherein heat medium is air).Be preferably the air temperature type heat exchanger of fin structure.
In this embodiment, (temperature is between-50 ℃～-160 ℃, and pressure 1KPaG～30KPaG) pass through the cryogenic natural gas pipeline to the air temperature type heat exchanger is by absorbing airborne heat heating cryogenic natural gas for the rock gas of low-temp low-pressure.The low-temp low-pressure rock gas through the heating of air temperature type heater after gas temperature 〉=-15 ℃, for example-15 ~ 0 ℃, for example-10 ~-5 ℃.Gas after heating is transported to the normal-temperature natural-gas compressor by pipeline (normal temperature low pressure natural gas pipes) again and pressurizes, outlet pressure 〉=0.8MPaG, 0.8 ~ 1.5MPaG for example, preferred 1.0 ~ 1.2MPaG is at last by outside normal temperature high voltage natural gas line dispatch station or next treatment process device.
In another embodiment, described heat exchanger is the water-bath type heat exchanger.The water-bath type heat exchanger can be for shell of pipe type or around tubular structure.
In this embodiment, (temperature is between-50 ℃～-160 ℃ for the rock gas of low-temp low-pressure, pressure 1KPaG～30KPaG) heat in the water-bath type heat exchanger by the cryogenic natural gas pipeline, gas temperature after heating 〉=5 ℃, for example 5 ~ 15 ℃, for example 6 ~ 10 ℃ again, being transported to the normal-temperature natural-gas compressor by pipeline (normal temperature low pressure natural gas pipes) again pressurizes, outlet pressure 〉=0.8MPaG, 0.8 ~ 1.5MPaG for example, preferred 1.0 ~ 1.2MPaG is at last by outside normal temperature high voltage natural gas line dispatch station or next treatment process device.
In another mode of execution, described heat exchanger comprises one or more air temperature type heat exchangers and/or one or more water-bath type heat exchanger in parallel, wherein the cryogenic natural gas pipeline is divided into a plurality of arms, Imported gas end with described one or more air temperature type heat exchangers and/or one or more water-bath type heat exchangers is connected respectively, and these rock gas outlet end of described one or more air temperature type heat exchangers and/or one or more water-bath type heat exchangers are connected with the Imported gas end of normal-temperature natural-gas compressor behind the interflow.
in this embodiment, (temperature is between-50 ℃～-160 ℃ for the rock gas of low-temp low-pressure, pressure 1KPaG～30KPaG) by being divided into a plurality of branches after the cryogenic natural gas pipeline, enter respectively in one or more air temperature type heat exchangers and/or one or more water-bath type heat exchanger and heat, gas temperature after heating in described air temperature type heat exchanger 〉=-15 ℃, for example-15 ~ 0 ℃, for example-10～-5 ℃, gas temperature after heating in described water-bath type heater 〉=5 ℃, for example 5 ~ 15 ℃, for example 6 ~ 10 ℃ again, the gas outlet end of described one or more air temperature type heat exchanger and/or one or more water-bath type heat exchangers is collaborated, being transported to the normal-temperature natural-gas compressor by pipeline (normal temperature low pressure natural gas pipes) pressurizes, outlet pressure 〉=0.8MPaG, 0.8 ~ 1.5MPaG for example, preferred 1.0 ~ 1.2MPaG, at last by outside normal temperature high voltage natural gas line dispatch station or next treatment process device.
In the mode of execution that comprises the water-bath type heat exchanger, preferably, the normal-temperature natural-gas compressor has the water-cooled chiller (for example heat exchange pipeline, heat exchanger) (wherein water circulates therein) of the heat that produces for cooling normal-temperature natural-gas compressor, the circulating water outlet end of this cooling unit is connected by the circulating water intake of pipeline with the water-bath type heat exchanger, and the circulating water outlet of water-bath type heat exchanger is connected with the circulating water entry end of the cooling unit of normal-temperature natural-gas compressor via circulating water pump by pipeline.By such design, the heat that the normal-temperature natural-gas compressor produces is along with circulating water is transported to the water-bath type heater by pipeline, and carrying out heat exchange with cryogenic natural gas, circulating water returns to the circulating water entry end that circulating water pump pressurization continues to be recycled to the cooling unit of normal-temperature natural-gas compressor again.
In this application, " entrance " has same meaning with " import ".
Preferably, between the circulating water outlet of water-bath type heat exchanger and circulating water pump, cooling tower is set, it is used for further cooling circulating water when detecting by the water temperature the water-bath type heater after higher than permitted value (for the water temperature permitted value of cooling normal-temperature natural-gas compressor, for example 32 ℃).
Preferably, between the circulating water intake of the circulating water outlet end of the cooling unit of normal-temperature natural-gas compressor and water-bath type heat exchanger, water heater is set, be used for (being used for the water temperature permitted value at water-bath type heater heating rock gas at circulating water temperature lower than permitted value, for example 5 ℃) time circulating water (when for example in the winter time moving) too low to temperature heat, guarantee to enter in the water-bath type heater before water temperature reach requirement.
KPaG and MPaG refer to gauge pressure in this application.
Circulating water enters, flows out temperature, the flow of water-bath type heat exchanger and complies with operating mode, the size of heat exchanger, the structure of the rock gas that enters heat exchanger, and the calculating of the factors such as operating mode of normal-temperature natural-gas compressor, therefore, is not particularly limited.
The cryogenic natural gas recycling and processing device that the utility model provides is applicable to LNG receiving station or LNG liquefaction plant.
Advantage of the present utility model:
1, the cryogenic natural gas recycling and processing device has stronger adaptability to gas composition, flow, pressure variation.
2, take full advantage of the heat energy of air or compressor, normal production does not need additionally to provide heat.
3, adopt the cryogenic natural gas compressor of domestic normal-temperature natural-gas compressor replace imported costliness, save an investment cost of engineering, also shorten the manufacture cycle of compressor simultaneously.
4, do not need additionally to newly increase equipment, can avoid unnecessary once investment and operation energy consumption.
Description of drawings
Fig. 1 is cryogenic natural gas recovery processing technique installation drawing;
Embodiment
See also Fig. 1, the cryogenic natural gas recycling and processing device that the utility model provides comprises:
Heat exchanger (water-bath type heat exchanger 10 and air temperature type heat exchanger 20), its Imported gas end is connected with cryogenic natural gas pipeline A, and
Normal-temperature natural-gas compressor 30, its Imported gas end is by pipeline B(normal temperature low pressure natural gas pipes) be connected with the gas outlet end of described heat exchanger 10 or 20, its gas outlet end is connected with normal temperature high voltage natural gas line C.
Wherein, for normal-temperature natural-gas compressor 30, the natural gas compressor of the commodity that for example can use Sichuan Jinxing Compressor Manufacturing Co., Ltd. to make M-61/16 type by name and DW-8/0.18-4 type.
Described heat exchanger comprises an air temperature type heat exchanger 20 and a water-bath type heat exchanger 10 in parallel, wherein the cryogenic natural gas pipeline is divided into two arms, respectively with a described air temperature type heat exchanger 20 with is connected the Imported gas end of a water-bath type heat exchanger 10 and is connected, a described air temperature type heat exchanger 20 with is connected these rock gas outlet end of a water-bath type heat exchanger 10 and is connected with the Imported gas end of normal-temperature natural-gas compressor 30 behind the interflow.
in this embodiment, (temperature is between-50 ℃～-160 ℃ for the rock gas of low-temp low-pressure, pressure 1KPaG～30KPaG) by being divided into two branches after the cryogenic natural gas pipeline, enter respectively in an air temperature type heat exchanger and a water-bath type heat exchanger and heat, gas temperature after heating in described air temperature type heat exchanger 20 〉=-15 ℃, for example-15 ~ 0 ℃, for example-10 ~-5 ℃, gas temperature after heating in described water-bath type heater 10 〉=5 ℃, for example 5 ~ 15 ℃, for example 6 ~ 10 ℃ again, the gas outlet end of a described air temperature type heat exchanger 20 and a water-bath type heat exchanger 10 is collaborated, being transported to normal-temperature natural-gas compressor 30 by pipeline (normal temperature low pressure natural gas pipes B) pressurizes, outlet pressure 〉=0.8MPaG, 0.8 ~ 1.5MPaG for example, preferred 1.0 ~ 1.2MPaG, at last by outside normal temperature high voltage natural gas line dispatch station or next treatment process device.
The normal-temperature natural-gas compressor has the water-cooled chiller (for example heat exchange pipeline, heat exchanger) (wherein water circulates at this cooling unit) of the heat that produces for cooling normal-temperature natural-gas compressor, the circulating water outlet end of this cooling unit is connected with the circulating water intake of water-bath type heat exchanger 10 by circulating line D, and the circulating water outlet of water-bath type heat exchanger 10 is connected with circulating water intake (or entrance) end of the cooling unit of normal-temperature natural-gas compressor 30 via circulating water pump 50 by circulating line D.By such design, the heat that normal-temperature natural-gas compressor 30 produces is along with water is transported to water-bath type heater 10 by pipeline, and carrying out heat exchange with cryogenic natural gas, circulating water returns to circulating water intake (or entrance) end that circulating water pump 50 pressurization continues to be recycled to the cooling unit of normal-temperature natural-gas compressor 30 again.
Between the circulating water outlet of water-bath type heat exchanger 10 and circulating water pump 50, cooling tower 40 is set, it is used for further cooling circulating water when detecting by the water temperature the water-bath type heater after higher than permitted value (for the water temperature permitted value of cooling normal-temperature natural-gas compressor, for example 32 ℃).
Between the circulating water intake of the circulating water outlet end of the cooling unit of normal-temperature natural-gas compressor 30 and water-bath type heat exchanger 10, water heater 60 is set, be used for (being used for the permitted value at water-bath type heater heating rock gas at circulating water temperature lower than permitted value, for example 5 ℃) time circulating water (when for example in the winter time moving) too low to temperature heat, guarantee to enter the water-bath type heater before water temperature reach requirement.
Yet, described heat exchanger is not limited to comprise an air temperature type heat exchanger 20 and a water-bath type heat exchanger 10 in parallel, can comprise that described heat exchanger comprises a plurality of (for example more than 2 or 2) air temperature type heat exchangers 20 and a plurality of (for example more than 2 or 2) water-bath type heat exchanger 10 in parallel, also can comprise a plurality of (for example more than 2 or 2) air temperature type heat exchangers 20 and a water-bath type heat exchanger 10 in parallel, can also comprise an air temperature type heat exchanger 20 and a plurality of (for example more than 2 or 2) water-bath type heat exchanger 10 in parallel.
Fig. 1 shows preferred implementation of the present utility model.Yet in one embodiment, the cryogenic natural gas recycling and processing device comprises:
Air temperature type heat exchanger 20, its Imported gas end is connected with cryogenic natural gas pipeline A, with normal-temperature natural-gas compressor 30, its Imported gas end is by pipeline B(normal temperature low pressure natural gas pipes) be connected with the gas outlet end of described heat exchanger 10 or 20, its gas outlet end is connected with normal temperature high voltage natural gas line C.
Described air temperature type heat exchanger 20 is preferably the air temperature type heat exchanger of fin structure.
In this embodiment, (temperature is between-50 ℃～-160 ℃, and pressure 1KPaG～30KPaG) enter into air temperature type heat exchanger 20 by cryogenic natural gas pipeline A heats cryogenic natural gas by absorbing airborne heat for the rock gas of low-temp low-pressure.The low-temp low-pressure rock gas through 20 heating of air temperature type heater after gas temperature 〉=-15 ℃, for example-15 ~ 0 ℃, for example-10～-5 ℃.Gas after heating is transported to normal-temperature natural-gas compressor 30 by pipeline (normal temperature low pressure natural gas pipes B) again and pressurizes, outlet pressure 〉=0.8MPaG, 0.8 ~ 1.5MPaG for example, preferred 1.0 ~ 1.2MPaG is at last by outside normal temperature high voltage natural gas line C dispatch station or next treatment process device.
In another embodiment, the cryogenic natural gas recycling and processing device comprises:
Water-bath type heat exchanger 10, its Imported gas end is connected with cryogenic natural gas pipeline A, and
Normal-temperature natural-gas compressor 30, its Imported gas end is by pipeline B(normal temperature low pressure natural gas pipes) be connected with the gas outlet end of described heat exchanger 10 or 20, its gas outlet end is connected with normal temperature high voltage natural gas line C.
Water-bath type heat exchanger 10 can be for shell of pipe type or around tubular structure.
in this embodiment, (temperature is between-50 ℃～-160 ℃ for the rock gas of low-temp low-pressure, pressure 1KPaG～30KPaG) heat in water-bath type heat exchanger 10 by cryogenic natural gas pipeline A, gas temperature after heating 〉=5 ℃, for example 5 ~ 15 ℃, for example 6 ~ 10 ℃ again, being transported to normal-temperature natural-gas compressor 30 by pipeline (normal temperature low pressure natural gas pipes B) again pressurizes, outlet pressure 〉=0.8MPaG, 0.8 ~ 1.5MPaG for example, preferred 1.0 ~ 1.2MPaG, at last by outside normal temperature high voltage natural gas line C dispatch station or next treatment process device.
In above-mentioned another mode of execution, preferably, the normal-temperature natural-gas compressor has the cooling unit (for example heat exchange pipeline, heat exchanger) (wherein water circulates at this cooling unit) of the heat that produces for cooling normal-temperature natural-gas compressor, the circulating water outlet end of this cooling unit is connected with the circulating water intake of water-bath type heat exchanger 10 by circulating line D, and the circulating water outlet of water-bath type heat exchanger 10 is connected with circulating water intake (or entrance) end of the cooling unit of normal-temperature natural-gas compressor 30 via circulating water pump 50 by circulating line D.By such design, the heat that normal-temperature natural-gas compressor 30 produces is along with water is transported to water-bath type heater 10 by pipeline, and carrying out heat exchange with cryogenic natural gas, circulating water returns to circulating water intake (or entrance) end that circulating water pump 50 pressurization continues to be recycled to the cooling unit of normal-temperature natural-gas compressor 30 again.
In addition, preferably, between the circulating water outlet of water-bath type heat exchanger 10 and circulating water pump 50, cooling tower 40 is set, it is used for further cooling circulating water when detecting by the water temperature the water-bath type heater after higher than permitted value (for the temperature permitted value of cooling normal-temperature natural-gas compressor, for example 32 ℃).
In addition, preferably, between the circulating water intake of the circulating water outlet end of the cooling unit of normal-temperature natural-gas compressor 30 and water-bath type heat exchanger 10, water heater 60 is set, be used for (being used for the permitted value at water-bath type heater heating rock gas at circulating water temperature lower than permitted value, for example 5 ℃) time circulating water (when for example in the winter time moving) too low to temperature heat, guarantee to enter the water-bath type heater before water temperature reach requirement.
Claims (8)
1. a cryogenic natural gas recycling and processing device, is characterized in that, this device comprises:
Heat exchanger, its Imported gas end is connected with the cryogenic natural gas pipeline, and
The normal-temperature natural-gas compressor, its Imported gas end is connected with the gas outlet end of described heat exchanger by pipeline, and its gas outlet end is connected with the normal temperature high voltage natural gas line.
2. cryogenic natural gas recycling and processing device according to claim 1, is characterized in that, described heat exchanger is the air temperature type heat exchanger.
3. cryogenic natural gas recycling and processing device according to claim 1, is characterized in that, described heat exchanger is the water-bath type heat exchanger.
4. cryogenic natural gas recycling and processing device according to claim 1, it is characterized in that, described heat exchanger comprises one or more air temperature type heat exchangers and/or one or more water-bath type heat exchanger in parallel, wherein the cryogenic natural gas pipeline is divided into a plurality of arms, Imported gas end with described one or more air temperature type heat exchangers and/or one or more water-bath type heat exchangers is connected respectively, these rock gas outlet end of described one or more air temperature type heat exchanger and/or one or more water-bath type heat exchangers are connected with the Imported gas end of normal-temperature natural-gas compressor behind the interflow.
5. according to claim 3 or 4 described cryogenic natural gas recycling and processing devices, it is characterized in that, the normal-temperature natural-gas compressor has the water-cooled chiller of the heat that produces for cooling normal-temperature natural-gas compressor, the circulating water outlet end of this cooling unit is connected by the circulating water intake of pipeline with the water-bath type heat exchanger, and the circulating water outlet of water-bath type heat exchanger is connected with the circulating water entry end of the cooling unit of normal-temperature natural-gas compressor via circulating water pump by pipeline.
6. cryogenic natural gas recycling and processing device according to claim 5, it is characterized in that between the circulating water outlet and circulating water pump of water-bath type heat exchanger, be provided for the cooling tower of further cooling circulating water when detecting by the water temperature after the water-bath type heater higher than permitted value.
7. cryogenic natural gas recycling and processing device according to claim 5, it is characterized in that between the circulating water intake of the circulating water outlet end of the cooling unit of normal-temperature natural-gas compressor and water-bath type heat exchanger, be provided for the water heater that the too low water of temperature is heated during lower than permitted value at circulating water temperature.
8. cryogenic natural gas recycling and processing device according to claim 6, it is characterized in that, between the circulating water intake of the circulating water outlet end of the cooling unit of normal-temperature natural-gas compressor and water-bath type heat exchanger, be provided for the water heater that the too low water of temperature is heated during lower than permitted value at circulating water temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688231 CN202927488U (en) | 2012-12-13 | 2012-12-13 | Low-temperature natural gas recycling and disposal device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688231 CN202927488U (en) | 2012-12-13 | 2012-12-13 | Low-temperature natural gas recycling and disposal device |
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| CN202927488U true CN202927488U (en) | 2013-05-08 |
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| CN 201220688231 Expired - Lifetime CN202927488U (en) | 2012-12-13 | 2012-12-13 | Low-temperature natural gas recycling and disposal device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605417A (en) * | 2016-01-08 | 2016-05-25 | 东莞新奥燃气有限公司 | Low-temperature natural gas recovery treatment device |
| CN112361214A (en) * | 2020-11-27 | 2021-02-12 | 无锡玄同科技有限公司 | Natural gas pressure regulating system |
| CN114876586A (en) * | 2022-04-18 | 2022-08-09 | 邯郸市泰荣天然气销售有限公司 | Differential pressure power generation device and technology |
-
2012
- 2012-12-13 CN CN 201220688231 patent/CN202927488U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605417A (en) * | 2016-01-08 | 2016-05-25 | 东莞新奥燃气有限公司 | Low-temperature natural gas recovery treatment device |
| CN112361214A (en) * | 2020-11-27 | 2021-02-12 | 无锡玄同科技有限公司 | Natural gas pressure regulating system |
| CN114876586A (en) * | 2022-04-18 | 2022-08-09 | 邯郸市泰荣天然气销售有限公司 | Differential pressure power generation device and technology |
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