A mobile natural gas liquefaction plant

Abstract

The application relates to the technical field of mobile natural gas liquefaction, in particular to a mobile natural gas liquefaction device which comprises a first positioning support plate, a second positioning support plate and a third positioning support plate, an initial cooling heat exchange box, a gas layered adsorber and a booster are installed on the first positioning support plate, the outlet of the gas layered adsorber is connected with the inlet of the booster, the outlet of the booster is connected with the inlet of the initial cooling heat exchange box, three heat exchange boxes of different grades are respectively loaded through the three positioning support plates, and then the heat exchange boxes are matched with purification equipment to realize the liquefaction of natural gas; compared with the existing liquefaction equipment device in the field, the device is small in size, can be moved with a vehicle, is simple to operate, and can realize the effect of directly on-site liquefaction of offshore platforms and remote natural gas points on land.

Description

Technical Field

[0001] This utility model relates to the field of mobile natural gas liquefaction technology, and in particular to a mobile natural gas liquefaction device. Background Technology

[0002] Existing natural gas liquefaction equipment includes compressors, heat exchangers, separation towers, purification towers, cryogenic pumps, expanders, and other fixed devices, all of which require high investment and large land area. Natural gas associated with onshore oil wells and offshore oil platforms is conventionally collected by laying pipelines to transport it to a natural gas processing plant for further processing or liquefaction. Pipeline laying is costly and time-consuming, and is inefficient for remote onshore wellheads and offshore platforms, forcing the natural gas to be released, which is both environmentally unfriendly and wasteful of resources.

[0003] Therefore, it is essential to provide a mobile natural gas liquefaction unit to address the shortcomings of existing technologies. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a mobile natural gas liquefaction device. This mobile natural gas liquefaction device uses three positioning support plates to load three heat exchange boxes of different grades, and together with purification equipment, it realizes the liquefaction of natural gas. Compared with the existing liquefaction equipment in the field, the advantages are that the equipment is small-scale, can be moved with vehicles, is easy to operate, and can realize the effect of direct on-site liquefaction at offshore platforms and remote natural gas outlets on land.

[0005] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0006] A mobile natural gas liquefaction device is provided, including a first positioning support plate, a second positioning support plate and a third positioning support plate. A primary cooling heat exchange box, a gas stratification adsorber and a booster are installed on the first positioning support plate. The outlet of the gas stratification adsorber is connected to the inlet of the booster, and the outlet of the booster is connected to the inlet of the primary cooling heat exchange box.

[0007] The second positioning support plate is equipped with a heavy hydrocarbon condenser separator, an intermediate cooling heat exchange box, and a carbon dioxide separator. The inlet of the heavy hydrocarbon condenser separator and the outlet of the primary cooling heat exchange box are detachably connected. The outlet of the heavy hydrocarbon condenser separator is connected to the intermediate cooling heat exchange box, and the outlet of the intermediate cooling heat exchange box is connected to the inlet of the carbon dioxide separator.

[0008] The third positioning support plate is equipped with a cryogenic heat exchange box and a nitrogen separator. The outlet of the carbon dioxide separator and the inlet of the cryogenic heat exchange box are detachably connected, and the outlet of the cryogenic heat exchange box and the inlet of the nitrogen separator are connected.

[0009] Specifically, the primary cooling heat exchanger and the intermediate cooling heat exchanger are detachably connected via a primary and intermediate refrigerant transfer pipe, and the intermediate cooling heat exchanger and the deep cooling heat exchanger are detachably connected via a deep and intermediate refrigerant transfer pipe.

[0010] Specifically, the stratified adsorber is equipped with an impurity discharge pipe, the heavy hydrocarbon condenser is equipped with a heavy hydrocarbon discharge pipe, and the carbon dioxide separator is equipped with a carbon dioxide vent pipe.

[0011] Specifically, the cryogenic heat exchanger is equipped with a liquid nitrogen injection port, and the primary cooling heat exchanger is equipped with a nitrogen venting pipe.

[0012] This invention uses three positioning support plates to mount three heat exchange boxes of different grades, and together with purification equipment, it realizes the liquefaction of natural gas. Compared with existing liquefaction equipment in the field, its advantages are that the equipment is small-scale, can be moved with vehicles, is easy to operate, and can achieve the effect of direct on-site liquefaction on offshore platforms and remote natural gas outlets on land. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0014] Figure 1 This is a three-dimensional structural diagram of a mobile natural gas liquefaction device according to this utility model.

[0015] from Figure 1 Including:

[0016] 1. First positioning support plate;

[0017] 2. Second positioning support plate;

[0018] 3. Third positioning support plate;

[0019] 4. Primary cooling heat exchanger;

[0020] 5. Gas stratification adsorber;

[0021] 6. Intensive compressor;

[0022] 7. Heavy hydrocarbon condenser / separator;

[0023] 8. Intercooled heat exchanger;

[0024] 9. Carbon dioxide separator;

[0025] 10. Cryogenic heat exchanger;

[0026] 11. Nitrogen separator;

[0027] 12. Primary and secondary refrigerant transfer pipes;

[0028] 13. Refrigerant transfer pipe between Shenzhen and Zhongshan;

[0029] 14. Impurity discharge pipe;

[0030] 15. Heavy hydrocarbon emission pipe;

[0031] 16. Carbon dioxide is released through the vent pipe;

[0032] 17. Liquid nitrogen injection port;

[0033] 18. Nitrogen venting pipe. Detailed Implementation

[0034] The present invention will be further described in conjunction with the following embodiments.

[0035] Example 1:

[0036] like Figure 1 As shown, a mobile natural gas liquefaction device includes a first positioning support plate 1, a second positioning support plate 2, and a third positioning support plate 3. The first positioning support plate 1 is equipped with a primary cooling heat exchange box 4, a gas stratification adsorber 5, and a booster compressor 6. The outlet of the gas stratification adsorber 5 is connected to the inlet of the booster compressor 6, and the outlet of the booster compressor 6 is connected to the inlet of the primary cooling heat exchange box 4.

[0037] Natural gas enters the gas stratification adsorber 5 through pipelines under initial pressure. The gas stratification adsorber 5 removes impurities, water, sulfur, and mercury from the natural gas, achieving a preliminary purification effect. The separated substances are collected in a special collection tank and then subjected to harmless treatment.

[0038] After preliminary purification by the gas stratified adsorber 5, the natural gas enters the booster 6 and is pressurized to 2.5 MPa. The booster 6 is set to provide a pressure differential for the subsequent liquefaction process. If the initial pressure of the natural gas reaches 4 MPa, the booster 6 is not required.

[0039] After being pressurized, the natural gas enters the natural gas coil inside the primary cooling heat exchanger 4. The primary cooling heat exchanger 4 has two sets of coils inside, one for natural gas and the other for low-temperature nitrogen. The tank contains a refrigerant with propane as the main component. The natural gas absorbs the cold energy in the heat exchanger through the coils, and the temperature drops to -50℃. The primary cooling heat exchanger 4 has the function of liquefying heavy hydrocarbon components, which achieves the effect of reducing the temperature of natural gas and liquefying heavy hydrocarbon components.

[0040] The second positioning support plate 2 is equipped with a heavy hydrocarbon condenser 7, an intermediate cooling heat exchange box 8, and a carbon dioxide separator 9. The inlet of the heavy hydrocarbon condenser 7 and the outlet of the primary cooling heat exchange box 4 are detachably connected. The outlet of the heavy hydrocarbon condenser 7 is connected to the intermediate cooling heat exchange box 8, and the outlet of the intermediate cooling heat exchange box 8 is connected to the inlet of the carbon dioxide separator 9.

[0041] The pre-cooled natural gas enters the heavy hydrocarbon condenser 7, where liquid heavy hydrocarbon components are separated from the natural gas. The heavy hydrocarbon condenser 7 has the function of separating heavy hydrocarbons, which achieves the effect of further purifying natural gas. The separated heavy hydrocarbon components are stored in a collection tank and then further processed and purified.

[0042] After the heavy hydrocarbon components are separated, the natural gas enters the natural gas coil of the intercooled heat exchange box 8. The intercooled heat exchange box 8 has a built-in coil and is filled with liquid nitrogen as a cold source. After the natural gas absorbs cold energy through the coil, the temperature drops to -100℃. The intercooled heat exchange box 8 has the function of forming dry ice from carbon dioxide, which further reduces the temperature of the natural gas and forms snowflake-shaped dry ice from carbon dioxide.

[0043] The cooled natural gas enters the carbon dioxide separator 9, where solid carbon dioxide (dry ice) is separated from the natural gas. The carbon dioxide separator 9 has the function of separating carbon dioxide, which further purifies the natural gas. The separated carbon dioxide is released through the carbon dioxide vent pipe 16.

[0044] The third positioning support plate 3 is equipped with a cryogenic heat exchange box 10 and a nitrogen separator 11. The outlet of the carbon dioxide separator 9 and the inlet of the cryogenic heat exchange box 10 are detachably connected, and the outlet of the cryogenic heat exchange box 10 and the inlet of the nitrogen separator 11 are connected.

[0045] After the carbon dioxide components are separated, the natural gas enters the natural gas coil of the cryogenic heat exchange box 10. The cryogenic heat exchange box 10 has a built-in coil and is filled with liquid nitrogen as a cold source. After the natural gas absorbs cold energy through the coil, the temperature drops to -162℃. The cryogenic heat exchange box 10 has the function of bringing the natural gas to the liquefaction temperature, thus achieving the effect of liquefying natural gas to form liquefied natural gas.

[0046] The primary cooling heat exchanger 4 and the intermediate cooling heat exchanger 8 are detachably connected by the intermediate and primary refrigerant transfer pipe 12, and the intermediate cooling heat exchanger 8 and the deep cooling heat exchanger 10 are detachably connected by the deep and intermediate refrigerant transfer pipe 13.

[0047] The stratified adsorber is equipped with an impurity discharge pipe 14, the heavy hydrocarbon condenser separator 7 is equipped with a heavy hydrocarbon discharge pipe 15, and the carbon dioxide separator 9 is equipped with a carbon dioxide vent pipe 16.

[0048] The cryogenic heat exchanger 10 is equipped with a liquid nitrogen injection port 17, and the primary cooling heat exchanger 4 is equipped with a nitrogen vent pipe 18.

[0049] Liquid nitrogen at -196°C is injected into the cryogenic heat exchanger 10 to provide cooling energy. After heat exchange, gaseous nitrogen at -160°C enters the space of the intercooled heat exchanger 8 through the vacuum pipeline to replenish the cooling energy of the intercooled heat exchanger 8.

[0050] Liquid nitrogen at -196℃ is injected into the intercooler heat exchanger 8 to provide cooling energy. After heat exchange, gaseous nitrogen at -100℃ enters the low-temperature nitrogen coil of the primary cooling heat exchanger 4 through the primary refrigerant transfer pipe 12 to provide cooling energy for the primary cooling heat exchanger 4. Cooling propane provides cooling energy for the natural gas in the natural gas coil. After heat exchange, the temperature of the low-temperature nitrogen rises to -10℃ and is released through the nitrogen vent pipe 18.

[0051] Three support and positioning plates are used to support various equipment on the ground and to divide the equipment on different flatbed trucks. Specifically, equipment on one support and positioning plate corresponds to one flatbed truck for transport. The layered adsorber 5 is 1.83 meters long and 2.22 meters wide; the booster compressor 6 is 2.7 meters long and 2.2 meters wide; the heavy hydrocarbon condenser separator 7 is 1.9 meters long and 1.9 meters wide; the carbon dioxide separator 9 is 2.2 meters long and 1.8 meters wide; the primary cooling heat exchanger 4, the intermediate cooling heat exchanger 8, and the cryogenic heat exchanger 10 are all 6.7 meters long and 2.2 meters wide. The flatbed truck is 2.4 meters wide and 17 meters long. In actual use, the first support and positioning plate... The gas stratification adsorber 5, booster 6, and primary cooling heat exchange box 4 on the support plate 1 can be placed on one flatbed truck in sequence along the length of the flatbed truck. The heavy hydrocarbon condenser separator 7, intermediate cooling heat exchange box 8, and carbon dioxide separator 9 on the second positioning support plate 2 can be placed on the second flatbed truck in sequence along the length of the flatbed truck. The cryogenic heat exchange box 10 and nitrogen separator 11 on the third positioning support plate 3 can be placed on the third flatbed truck in sequence along the length of the flatbed truck. The entire equipment can be transported by three flatbed trailers. Its miniaturized and modular design makes it suitable for various on-site working conditions.

[0052] This invention uses three positioning support plates to mount three heat exchange boxes of different grades, and together with purification equipment, it realizes the liquefaction of natural gas. Compared with existing liquefaction equipment in the field, its advantages are that the equipment is small-scale, can be moved with vehicles, is easy to operate, and can achieve the effect of direct on-site liquefaction on offshore platforms and remote natural gas outlets on land.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A mobile natural gas liquefaction plant, characterized by: It includes a first positioning support plate, a second positioning support plate and a third positioning support plate. The first positioning support plate is equipped with a primary cooling heat exchange box, a gas stratification adsorber and a booster. The outlet of the gas stratification adsorber is connected to the inlet of the booster, and the outlet of the booster is connected to the inlet of the primary cooling heat exchange box. The second positioning support plate is equipped with a heavy hydrocarbon condenser separator, an intercooler heat exchange box, and a carbon dioxide separator. The inlet of the heavy hydrocarbon condenser separator and the outlet of the intercooler heat exchange box are detachably connected. The outlet of the heavy hydrocarbon condenser separator is connected to the intercooler heat exchange box, and the outlet of the intercooler heat exchange box is connected to the inlet of the carbon dioxide separator. The third positioning support plate is equipped with a cryogenic heat exchange box and a nitrogen separator. The outlet of the carbon dioxide separator and the inlet of the cryogenic heat exchange box are detachably connected, and the outlet of the cryogenic heat exchange box and the inlet of the nitrogen separator are connected.

2. A mobile natural gas liquefaction apparatus according to claim 1, characterized in that: The primary cooling heat exchanger and the intermediate cooling heat exchanger are detachably connected via a primary and intermediate refrigerant transfer pipe, and the intermediate cooling heat exchanger and the deep cooling heat exchanger are detachably connected via a deep and intermediate refrigerant transfer pipe.

3. A mobile natural gas liquefaction apparatus according to claim 2, wherein: The stratified adsorber is equipped with an impurity discharge pipe, the heavy hydrocarbon condenser is equipped with a heavy hydrocarbon discharge pipe, and the carbon dioxide separator is equipped with a carbon dioxide vent pipe.

4. A mobile natural gas liquefaction apparatus according to claim 3, wherein: The cryogenic heat exchanger is equipped with a liquid nitrogen injection port, and the primary cooling heat exchanger is equipped with a nitrogen vent pipe.

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