CN105605417A - A low-temperature natural gas recovery and processing device - Google Patents

A low-temperature natural gas recovery and processing device Download PDF

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Publication number
CN105605417A
CN105605417A CN201610010590.5A CN201610010590A CN105605417A CN 105605417 A CN105605417 A CN 105605417A CN 201610010590 A CN201610010590 A CN 201610010590A CN 105605417 A CN105605417 A CN 105605417A
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natural gas
low
heat exchanger
water
processing device
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吕忠林
林业
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DONGGUAN XINAO GAS CO LTD
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DONGGUAN XINAO GAS CO LTD
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
    • F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a low-temperature natural gas recovery processing device, which comprises a heat exchanger, a natural gas compressor, a heat-insulating water tank and a high-pressure buffer tank, wherein a metal partition plate is arranged in the heat exchanger along the axis direction, the metal partition plate divides the internal space of the heat exchanger into an air cavity and a water cavity, the air inlet end of the air cavity of the heat exchanger is connected with a low-temperature natural gas pipeline, the air outlet end of the air cavity of the heat exchanger is connected with the natural gas compressor, the water inlet end of the water cavity of the heat exchanger is connected with the upper part of the heat-insulating water tank through a pipeline, the water outlet end of the. The invention recovers the low-temperature natural gas and recovers the waste heat to produce hot water, thereby saving resources.

Description

一种低温天然气回收处理装置A low-temperature natural gas recovery and processing device

技术领域 technical field

本发明涉及一种低温天然气回收处理装置。 The invention relates to a low-temperature natural gas recovery and treatment device.

背景技术 Background technique

随着中国经济的发展，对能源的需求日渐增长，国内的液化天然气应用处于蓬勃发展中。对于液化天然气（LNG）接收站、LNG液化工厂，由于LNG储罐、输送管道不可避免要吸收外部热量，产生了大量的低温天然气。如果不能有效的回收利用低温天然气，直接将其排放大气，不但造成环境的污染，也造成能源的浪费。 With the development of China's economy, the demand for energy is increasing day by day, and the application of domestic liquefied natural gas is developing vigorously. For liquefied natural gas (LNG) receiving stations and LNG liquefaction plants, because LNG storage tanks and pipelines inevitably absorb external heat, a large amount of low-temperature natural gas is produced. If the low-temperature natural gas cannot be effectively recycled and directly discharged into the atmosphere, it will not only cause environmental pollution, but also cause a waste of energy.

目前，在LNG接收站，传统的低温天然气回收工艺主要采用直接加压输出工艺和再冷凝工艺。直接加压输出工艺是采用低温天然气压缩机，将低温低压天然气加压到常温高压状态，直接输送到站外燃气管网。再冷凝工艺是将低温的天然气加压、再从LNG储罐抽取LNG，两者按一定比例在再冷凝中直接换热，将低温天然气再次液化，输送到高压泵加压气化。这两种工艺中，低温天然气压缩机是低温天然气回收利用的关键设备，关系到主体设备——LNG储罐的正常安全运行。目前一般采用低温无油往复式或迷宫式压缩机，国内压缩机制造厂尚无设计、制造该类压缩机的成熟经验，主要依赖进口，设备生产周期长，制造成本高。 At present, at the LNG receiving station, the traditional low-temperature natural gas recovery process mainly adopts the direct pressurization output process and the recondensation process. The direct pressurization output process uses a low-temperature natural gas compressor to pressurize the low-temperature and low-pressure natural gas to a normal temperature and high pressure state, and directly transports it to the gas pipeline network outside the station. The recondensation process is to pressurize the low-temperature natural gas, and then extract LNG from the LNG storage tank. The two directly exchange heat in the recondensation according to a certain ratio, liquefy the low-temperature natural gas again, and transport it to the high-pressure pump for pressurized gasification. Among these two processes, the low-temperature natural gas compressor is the key equipment for the recovery and utilization of low-temperature natural gas, which is related to the normal and safe operation of the main equipment - LNG storage tank. At present, low-temperature oil-free reciprocating or labyrinth compressors are generally used. Domestic compressor manufacturers have no mature experience in designing and manufacturing such compressors. They mainly rely on imports. The production cycle of equipment is long and the manufacturing cost is high.

发明内容 Contents of the invention

本发明要解决的技术问题是提供一种低温天然气回收处理装置，制造成本较低，有效节省资源。 The technical problem to be solved by the present invention is to provide a low-temperature natural gas recovery and treatment device, which has low manufacturing cost and effectively saves resources.

为了解决上述技术问题，本发明采取以下技术方案： In order to solve the above technical problems, the present invention takes the following technical solutions:

一种低温天然气回收处理装置，包括换热器和天然气压缩机，还包括保温水箱和高压缓冲罐，换热器内沿轴线方向设置金属隔板，该金属隔板将换热器的内部空间分隔成气腔和水腔，换热器的气腔的进气端与低温天然气管道连接、出气端与天然气压缩机连接，换热器的水腔的进水端通过管路与保温水箱上部连接、出水端通过管路与保温水箱下部连接，保温水箱下部还设有进水管。 A low-temperature natural gas recovery and processing device, including a heat exchanger and a natural gas compressor, and also includes a thermal insulation water tank and a high-pressure buffer tank. A metal partition is arranged in the heat exchanger along the axial direction, and the metal partition separates the internal space of the heat exchanger. The gas cavity and water cavity are formed. The inlet end of the gas cavity of the heat exchanger is connected to the low-temperature natural gas pipeline, the gas outlet end is connected to the natural gas compressor, and the water inlet end of the water cavity of the heat exchanger is connected to the upper part of the heat preservation water tank through a pipeline. The water outlet end is connected with the lower part of the thermal insulation water tank through a pipeline, and the lower part of the thermal insulation water tank is also provided with a water inlet pipe.

所述换热器内的金属隔板上朝向气腔的表面设有导热片。 A heat conduction sheet is provided on the surface of the metal separator in the heat exchanger facing the air cavity.

所述高压缓冲罐还连接有放散塔，该放散塔与高压缓冲罐间的连接管路上设有隔离阀。 The high-pressure buffer tank is also connected with a release tower, and an isolation valve is provided on the connecting pipeline between the release tower and the high-pressure buffer tank.

所述保温水箱内设有电加热器。 An electric heater is arranged in the heat preservation water tank.

所述保温水箱内还设有水位检测器和温度传感器，水位检测器位于保温水箱的热水出口上方。 A water level detector and a temperature sensor are also provided in the heat preservation water tank, and the water level detector is located above the hot water outlet of the heat preservation water tank.

所述换热器内的金属隔板为铝材料制成。 The metal partitions in the heat exchanger are made of aluminum.

所述进水管上设有电磁阀。 The water inlet pipe is provided with a solenoid valve.

本发明将低温天然气加热为常温天然气以重新供下游管网使用，并且利用天然气压缩机产生的烟气余热进行热水制取，同时将该热水作为换热器的热源，并且还可以为外界提供热水使用。 The invention heats low-temperature natural gas into normal-temperature natural gas for reuse in the downstream pipeline network, and utilizes the waste heat of the flue gas generated by the natural gas compressor to produce hot water. Hot water is provided.

附图说明 Description of drawings

附图1为本发明管路连接原理示意图。 Accompanying drawing 1 is the schematic diagram of the principle of pipeline connection of the present invention.

具体实施方式 detailed description

为了便于本领域技术人员的理解，下面结合附图对本发明作进一步的描述。 In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.

如附图1所示，本发明揭示了一种低温天然气回收处理装置，包括换热器1和天然气压缩机6，还包括保温水箱和高压缓冲罐8，换热器1内沿轴线方向设置金属隔板2，该金属隔板2将换热器的内部空间分隔成气腔4和水腔5，换热器1的气腔4的进气端与低温天然气管道连接、出气端与天然气压缩机6连接，换热器1的水腔5的进水端通过管路与保温水箱上部连接、出水端通过管路与保温水箱下部连接，保温水箱下部还设有进水管12。金属隔板优选用铝材料制成，具有更好的导热性。换热器1内的金属隔板2上朝向气腔的表面设有导热片3，利用该导热片，可以使水腔中的热能更加快速和均匀的传递到气腔中。 As shown in Figure 1, the present invention discloses a low-temperature natural gas recovery and processing device, including a heat exchanger 1 and a natural gas compressor 6, and also includes a thermal insulation water tank and a high-pressure buffer tank 8. Metal Partition 2, the metal partition 2 divides the internal space of the heat exchanger into an air chamber 4 and a water chamber 5, the inlet end of the air chamber 4 of the heat exchanger 1 is connected to a low-temperature natural gas pipeline, and the gas outlet end is connected to a natural gas compressor 6 connection, the water inlet end of the water chamber 5 of the heat exchanger 1 is connected with the upper part of the thermal insulation water tank through the pipeline, and the water outlet is connected with the lower part of the thermal insulation water tank through the pipeline, and the lower part of the thermal insulation water tank is also provided with a water inlet pipe 12. The metal separator is preferably made of aluminum, which has better thermal conductivity. The metal partition plate 2 in the heat exchanger 1 is provided with a heat conduction sheet 3 on the surface facing the air cavity, and the thermal energy in the water cavity can be transferred to the air cavity more quickly and uniformly by using the heat conduction sheet.

此外，高压缓冲罐8还连接有放散塔7，该放散塔7与高压缓冲罐8间的连接管路上设有隔离阀。打开隔离阀，即可将高压缓冲罐内的气体输送到放散塔中，在放散塔中进行放散，确保高压缓冲罐内的压力不会过高。 In addition, the high-pressure buffer tank 8 is also connected with a release tower 7 , and an isolation valve is provided on the connecting pipeline between the release tower 7 and the high-pressure buffer tank 8 . By opening the isolation valve, the gas in the high-pressure buffer tank can be transported to the release tower, where it can be released to ensure that the pressure in the high-pressure buffer tank will not be too high.

保温水箱内设有电加热器11，确保当保温水箱内的水的温度低时可以启动该电加热器进行辅助加热，使水的温度达到预定温度。保温水箱内还设有水位检测器9和温度传感器10，水位检测器位于保温水箱的热水出口上方。通过该温度传感器实时的检测水的温度，并且水位检测器则可以实时检测保温水箱内的水量是否充足，如果水量少，则可以打开进水管向保温水箱输入自来水。进水管上设有电磁阀，实现自动化打开和关闭。 An electric heater 11 is provided in the heat-retaining water tank to ensure that the electric heater can be started for auxiliary heating when the temperature of the water in the heat-retaining water tank is low, so that the temperature of the water reaches a predetermined temperature. Also be provided with water level detector 9 and temperature sensor 10 in the heat preservation water tank, water level detector is positioned at the hot water outlet top of heat preservation water tank. The temperature of the water is detected in real time by the temperature sensor, and the water level detector can detect in real time whether the water quantity in the thermal insulation water tank is sufficient. If the water quantity is low, the water inlet pipe can be opened to input tap water to the thermal insulation water tank. There is a solenoid valve on the water inlet pipe to realize automatic opening and closing.

本发明中，低温天然气进入到换热器的气腔中，保温水箱内的热水流到换热器的水腔中，热水的热能经金属隔板传递到气腔内，对流经气腔的低温天然气进行升温，然后从换热器出来的升到常温后的天然气进入到天然气压缩机中进行升压，然后再输入到高压缓冲罐内进行储存，从而从高压缓冲罐中传送到下游管网中。当高压缓冲罐内的压力过大时，可以打开隔离阀，将部分高压天然气输送至放散塔中进行放散。通过将天然气压缩机的烟气进行回收并用于对保温水箱进行加热，使得保温水箱内的水温上升。保温水箱内的水温如果低于设定温度时，可通过保温水箱内的电加热器进行辅助加热，如冬季较冷的季节。 In the present invention, the low-temperature natural gas enters the air chamber of the heat exchanger, the hot water in the heat preservation water tank flows into the water chamber of the heat exchanger, and the heat energy of the hot water is transferred into the air chamber through the metal partition, and convectively flows through the air chamber The low-temperature natural gas is heated up, and then the natural gas that has been raised to normal temperature from the heat exchanger enters the natural gas compressor for boosting, and then is input into the high-pressure buffer tank for storage, so that it is transmitted from the high-pressure buffer tank to the downstream pipeline in the net. When the pressure in the high-pressure buffer tank is too high, the isolation valve can be opened to transport part of the high-pressure natural gas to the release tower for release. By recovering the flue gas from the natural gas compressor and using it to heat the heat preservation water tank, the temperature of the water in the heat preservation water tank is raised. If the water temperature in the heat preservation water tank is lower than the set temperature, it can be supplemented by the electric heater in the heat preservation water tank for auxiliary heating, such as the colder season in winter.

需要说明的是，以上所述并非是对本发明技术方案的限定，在不脱离本发明的创造构思的前提下，任何显而易见的替换均在本发明的保护范围之内。 It should be noted that the above description is not a limitation to the technical solution of the present invention, and any obvious replacements are within the protection scope of the present invention without departing from the inventive concept of the present invention.

Claims (7)

1.一种低温天然气回收处理装置，包括换热器和天然气压缩机，其特征在于，还包括保温水箱和高压缓冲罐，换热器内沿轴线方向设置金属隔板，该金属隔板将换热器的内部空间分隔成气腔和水腔，换热器的气腔的进气端与低温天然气管道连接、出气端与天然气压缩机连接，换热器的水腔的进水端通过管路与保温水箱上部连接、出水端通过管路与保温水箱下部连接，保温水箱下部还设有进水管。 1. A low-temperature natural gas recovery and processing device, comprising a heat exchanger and a natural gas compressor, characterized in that it also includes an insulated water tank and a high-pressure buffer tank, and a metal partition is arranged along the axial direction in the heat exchanger, and the metal partition will replace The inner space of the heat exchanger is divided into an air chamber and a water chamber. The inlet end of the air chamber of the heat exchanger is connected to a low-temperature natural gas pipeline, and the gas outlet end is connected to a natural gas compressor. The water inlet end of the water chamber of the heat exchanger passes through the pipeline It is connected with the upper part of the heat preservation water tank, and the water outlet is connected with the lower part of the heat preservation water tank through pipelines, and the lower part of the heat preservation water tank is also provided with a water inlet pipe. 2.根据权利要求1所述的低温天然气回收处理装置，其特征在于，所述换热器内的金属隔板上朝向气腔的表面设有导热片。 2 . The low-temperature natural gas recovery and processing device according to claim 1 , characterized in that, the surface of the metal partition in the heat exchanger facing the air cavity is provided with a heat conduction plate. 3 . 3.根据权利要求2所述的低温天然气回收处理装置，其特征在于，所述高压缓冲罐还连接有放散塔，该放散塔与高压缓冲罐间的连接管路上设有隔离阀。 3. The low-temperature natural gas recovery and processing device according to claim 2, characterized in that, the high-pressure buffer tank is also connected to a release tower, and an isolation valve is provided on the connecting pipeline between the release tower and the high-pressure buffer tank. 4.根据权利要求3所述的低温天然气回收处理装置，其特征在于，所述保温水箱内设有电加热器。 4. The low-temperature natural gas recovery and processing device according to claim 3, characterized in that, an electric heater is provided in the thermal insulation water tank. 5.根据权利要求4所述的低温天然气回收处理装置，其特征在于，所述保温水箱内还设有水位检测器和温度传感器，水位检测器位于保温水箱的热水出口上方。 5. The low-temperature natural gas recovery and processing device according to claim 4, characterized in that, a water level detector and a temperature sensor are also provided in the heat preservation water tank, and the water level detector is located above the hot water outlet of the heat preservation water tank. 6.根据权利要求5所述的低温天然气回收处理装置，其特征在于，所述换热器内的金属隔板为铝材料制成。 6. The low-temperature natural gas recovery and processing device according to claim 5, characterized in that, the metal partition in the heat exchanger is made of aluminum. 7.根据权利要求6所述的低温天然气回收处理装置，其特征在于，所述进水管上设有电磁阀。 7. The low-temperature natural gas recovery and processing device according to claim 6, wherein a solenoid valve is provided on the water inlet pipe.
CN201610010590.5A 2016-01-08 2016-01-08 A low-temperature natural gas recovery and processing device Pending CN105605417A (en)

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Application publication date: 20160525