CN217929404U - Unconventional shale gas LNG factory pretreatment and liquefaction skid-mounted system - Google Patents
Unconventional shale gas LNG factory pretreatment and liquefaction skid-mounted system Download PDFInfo
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- CN217929404U CN217929404U CN202221560668.8U CN202221560668U CN217929404U CN 217929404 U CN217929404 U CN 217929404U CN 202221560668 U CN202221560668 U CN 202221560668U CN 217929404 U CN217929404 U CN 217929404U
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Abstract
The utility model discloses an unconventional shale gas LNG mill preliminary treatment and liquefaction sled dress system, including decarbonization sled dress unit, dehydration demercuration sled dress unit, cold box sled dress unit and LNG filling sled dress unit, the entry end of decarbonization sled dress unit passes through raw materials natural gas pipeline and links to each other with well site gas collecting device, and the exit end of decarbonization sled dress unit links to each other with the entry end of dehydration demercuration sled dress unit through wet purification gas pipeline, and the exit end of dehydration demercuration sled dress unit links to each other with the entry end of cold box sled dress unit through dry purification gas pipeline, and the exit end of cold box sled dress unit passes through the LNG pipeline and links to each other with the entry end of LNG filling sled dress unit. The utility model has the advantages that: the utility model discloses each main part unit is whole to become the sled, can fast assembly put into production and piecemeal dismouting, and technology is succinct, and operation elasticity is big, reliability and strong adaptability, and area is little, the small investment, convenient whole removal and reuse, the cost of transportation is low.
Description
Technical Field
The utility model relates to an unconventional shale gas processing technology field, concretely relates to unconventional shale gas LNG mill preliminary treatment and liquefaction sled dress system.
Background
Shale gas is a clean and efficient unconventional natural gas resource, the main component of the shale gas is methane, the molar content of the shale gas is over 97 percent, and C 2 + The content of the above components is about 0.5%, and CO 2 The content is less than 3 percent and the sulfur is not contained. At present, shale gas is generally sold in a pipeline mode after being dehydrated. Due to the fact that the shale gas field blocks are large, the terrain conditions of mountainous areas where certain shale gas fields are located are complex, and part of edge wells are not suitable for pipe transportation centralized processing and sale. In order to release the productivity as soon as possible and achieve economic benefits, it is necessary to improve the prior art.
Disclosure of Invention
An object of the utility model is to provide an unconventional shale gas LNG mill preliminary treatment and liquefaction sled dress system to prior art's is not enough, can be with shale gas decarbonization, dehydration and demercuration, production behind the liquefaction processing for Liquefied Natural Gas (LNG) to solve the natural gas transportation and the sales problem of shale gas field well far away, each main part unit is whole to become the sled simultaneously, takes up an area of for a short time, the small investment, be convenient for equipment and wholly move and reuse.
The utility model adopts the technical proposal that: the utility model provides an unconventional shale gas LNG mill preliminary treatment and liquefaction sled dress system, includes decarbonization sled dress unit, dehydration demercuration sled dress unit, cold box sled dress unit and LNG filling sled dress unit, the entry end of decarbonization sled dress unit passes through the raw materials natural gas pipeline and links to each other with well site gas collection device, and the exit end of decarbonization sled dress unit links to each other with the entry end of dehydration demercuration sled dress unit through wet purification gas pipeline, and the exit end of dehydration demercuration sled dress unit links to each other with the entry end of cold box sled dress unit through dry purification gas pipeline, and the exit end of cold box sled dress unit passes through the LNG pipeline and links to each other with the entry end of LNG filling sled dress unit.
According to the scheme, the decarburization skid-mounted unit comprises a decarburization skid seat, and a coalescence filter, a decarburization tower, a wet purification gas separator and a regeneration assembly which are arranged on the decarburization skid seat; an inlet of the coalescence filter is connected with a raw material natural gas inlet, and a gas outlet at the top of the coalescence filter is connected with an inlet of the decarbonization tower; a top gas outlet of the decarbonizing tower is communicated with an inlet of the wet purification gas separator after passing through the wet purification gas cooler, a bottom outlet of the decarbonizing tower is communicated with an inlet end of the regeneration assembly through a regeneration pipeline, and an upper inlet of the decarbonizing tower is communicated with an outlet end of the regeneration assembly through a return pipeline; the top outlet of the wet purification gas separator is communicated with the wet purification gas outlet through a pipeline, and the bottom outlet of the wet purification gas separator is communicated with a regeneration pipeline; coalescence filter bottom is connected with sewage pipes, the lateral part of locating decarbonization sled seat is equallyd divide to raw materials natural gas import, wet purification gas export to and sewage pipes's drain.
According to the scheme, the regeneration assembly comprises a lean and rich liquid heat exchanger, an amine liquid regeneration tower and an amine liquid cooler, wherein a cold source inlet of the lean and rich liquid heat exchanger is communicated with an outlet end of a regeneration pipeline, a cold source outlet of the lean and rich liquid heat exchanger is connected with an upper inlet of the amine liquid regeneration tower through a pipeline, an upper water inlet/outlet of the amine liquid regeneration tower is communicated with a circulating cooling water pipeline, a bottom lean liquid outlet of the amine liquid regeneration tower is communicated with a heat source inlet of the lean and rich liquid heat exchanger through a pipeline, a heat source outlet of the lean and rich liquid heat exchanger is communicated with a heat source inlet of the amine liquid cooler through a pipeline, a heat source outlet of the amine liquid cooler is communicated with an inlet of a filtering assembly through a pipeline, and an outlet of the filtering assembly is communicated with a backflow pipeline; the lower rich amine liquid outlet of the amine liquid regeneration tower is communicated with the bottom inlet of the reboiler, the upper gas phase outlet of the reboiler is communicated with the lower gas phase inlet of the amine liquid regeneration tower, and the bottom liquid phase outlet of the reboiler is communicated with the lower liquid phase inlet of the amine liquid regeneration tower.
According to the scheme, the dehydration and demercuration skid-mounted unit comprises a dehydration and demercuration skid seat, and a pre-filter, a first dehydration tower, a second dehydration tower, a demercuration tower and a post-filter which are arranged on the dehydration and demercuration skid seat, wherein the inlet of the pre-filter is communicated with a wet purified gas inlet through a pipeline, and the outlet of the pre-filter is respectively communicated with the top inlet of the first dehydration tower and the top inlet of the second dehydration tower through pipelines; the bottom outlet of the first dehydrating tower and the bottom outlet of the second dehydrating tower are respectively communicated with a first pipeline; the first pipeline is communicated with a top inlet of the demercuration tower, a bottom outlet of the demercuration tower is communicated with a lower inlet of the post-filter, and an upper outlet of the post-filter is communicated with a dry purified gas outlet through a pipeline; the wet purified gas inlet and the dry purified gas outlet are respectively arranged on the lateral parts of the dehydration and demercuration pry seat.
According to the scheme, the dehydration and demercuration skid-mounted unit further comprises a regeneration gas cooling device, a regeneration gas separator and a compression pump which are arranged on the dehydration and demercuration skid seat, an outlet of the pre-filter is communicated with a heat source inlet of a regeneration gas cooler through a pipeline, a heat source outlet of regeneration gas cooling gas is communicated with an inlet of the regeneration gas separator, a cold source inlet of the regeneration gas cooling gas is communicated with a circulating cooling water inlet through a pipeline, and a cold source outlet of the regeneration gas cooler is communicated with a circulating cooling water outlet through a pipeline; the top gas outlet of the regeneration gas separator is communicated with the inlet of the compressor, and the gas outlet of the compressor is communicated with the wet purified gas inlet through a pipeline; the bottom outlet of the regeneration gas separator is communicated with a sewage draining outlet; and the circulating cooling water inlet, the circulating cooling water outlet and the sewage outlet are respectively arranged at the side part of the dehydration and demercuration pry seat.
According to the scheme, the dehydration and demercuration skid-mounted unit further comprises a regeneration gas electric heater, the outlet of the dry purified gas is communicated with the inlet of the regeneration gas electric heater through a second pipeline, and the outlet of the regeneration gas electric heater is communicated with the first pipeline.
According to the scheme, the cold box skid-mounted unit comprises a cold box skid seat, a primary heat exchanger and a secondary heat exchanger, wherein the primary heat exchanger and the secondary heat exchanger are arranged on the cold box skid seat; the lateral part of cold box sled seat is located to dry purification gas import and LNG export. The primary heat exchanger and the secondary heat exchanger are both plate-fin heat exchangers.
According to the scheme, the LNG filling skid-mounted unit comprises an LNG filling skid-mounted seat, an LNG main pipe, a plurality of filling branch pipes, a plurality of gasification branch pipes, a BOG pipeline, a BOG vaporizer and a BOG buffer tank, wherein the LNG main pipe, the plurality of filling branch pipes, the plurality of gasification branch pipes, the BOG pipeline, the BOG vaporizer and the BOG buffer tank are arranged on the LNG filling skid-mounted seat; the LNG main pipe is connected with an LNG inlet arranged on one side of the LNG filling pry seat, an inlet of each filling branch pipe and an inlet of each gasification branch pipe are respectively communicated with the LNG main pipe, and an outlet of each filling branch pipe is connected with an LNG filling port arranged on the other side of the LNG filling pry seat; the inlet of the BOG pipeline is connected with a BOG inlet arranged on the side portion of the LNG filling pry seat, the inlet of the BOG pipeline and the outlet of the gasification branch pipe are communicated with the inlet of the BOG vaporizer respectively, the inlet of the BOG buffer tank is communicated with the outlet of the BOG vaporizer, and the outlet of the BOG buffer tank is communicated with a fuel gas interface arranged on the side portion of the LNG filling pry seat through a pipeline.
According to the scheme, the decarburization pry seat, the dehydration and demercuration pry seat, the LNG filling pry seat and the cold box pry seat respectively comprise a frame and a steel plate fixed on the frame; the frame is of a steel structure and is formed by connecting a transverse main beam and a longitudinal main beam in an enclosing manner, and a plurality of transverse secondary beams and longitudinal secondary beams are arranged in the frame at intervals.
According to the scheme, base plates are additionally arranged at four corners of the LNG filling pry seat, and reinforcing rib plates are arranged between the base plates and the transverse main beam or the longitudinal main beam of the frame; and the base plate is provided with a connecting bolt hole so as to install and fix the cold box prying seat through a bolt.
The beneficial effects of the utility model are that:
1. the utility model is built in the edge well, the shale gas is processed by decarburization, demercuration and dehydration pretreatment, and then liquefied to produce LNG, the volume is reduced, the LNG tanker can be used for outward transportation and sale, and the problem of shale gas transportation of the edge well is solved; meanwhile, each main body unit is integrally prized, rapid assembly and production and block disassembly and assembly can be realized, the process is simple, the operation elasticity is high, the reliability and adaptability are high, the occupied area is small, the investment is low, the integral moving and the recycling are convenient, and the transportation cost is low.
2. The utility model has high function integration level of the skid-mounted equipment, greatly reduces the workload of on-site piping, can realize rapid assembly and production, and is convenient for operation, maintenance and operation management; the whole skid-mounted equipment has compact structure, small size and small occupied area, can be flexibly arranged according to the field condition, and solves the difficult problem of difficult layout under the condition of complex mountainous regions; the whole skid-mounted equipment is convenient to move and recycle, and the recycling rate of the equipment is greatly improved.
3. The utility model discloses well liquefaction technology chooses single cycle mixed refrigeration natural gas liquefaction technology for use, reaches the quantity that reduces the mobile device under the condition of lower liquefaction energy consumption, makes the device can long period running and reduce the maintenance cost.
Drawings
Fig. 1 is a schematic view of the overall structure of an embodiment of the present invention.
FIG. 2 is a schematic view showing the construction of the decarburization skid in this embodiment.
Fig. 3 is a schematic structural view of the decarburization pry base in this embodiment.
Fig. 4 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of fig. 3.
Fig. 5 is a schematic structural diagram of a dehydration and demercuration skid unit in the embodiment.
Fig. 6 is a schematic structural view of the dehydration and demercuration pry base in the embodiment.
Fig. 7 is a sectional view B-B of fig. 6.
Fig. 8 is a schematic structural view of the refrigerator skid unit in this embodiment.
Fig. 9 is a schematic structural view of a box pry seat in the embodiment.
Fig. 10 is a cross-sectional view C-C of fig. 9.
Fig. 11 is a schematic structural diagram of an LNG filling skid-mounted unit in this embodiment.
Fig. 12 is a schematic structural view of the LNG filling pry seat in this embodiment.
Fig. 13 is a cross-sectional view taken along line D-D of fig. 12.
The designations in the figures illustrate the following:
1. a decarburization skid-mounted unit; 101. a coalescing filter; 102. a wet purification gas separator; 103. a decarbonizing tower; 104. an amine liquid circulating pump; 105. a wet purified gas cooler; 106. amine liquid coolers (plate fin); 107. lean-rich liquor heat exchangers (plate fin); 108. an activated carbon filter; 109. a mechanical filter; 110. an amine liquid regeneration tower; 111. a reboiler; 112. a regeneration pipeline; 113. a return line; 114. a decarburization pry seat;
2. a dehydration and demercuration skid-mounted unit; 201. a pre-filter; 202. a post-filter; 203. a first dehydration tower; 204. a demercuration tower; 205. a second dehydration tower; 206. a regeneration gas cooler; 207. a regeneration gas separator; 208. a regeneration gas compressor; 209. A regeneration gas electric heater; 210. a dehydration and demercuration pry seat;
3. a cold box skid-mounted unit; 301. a primary heat exchanger; 302. a secondary heat exchanger; 303. a first refrigerant gas-liquid separator; 304. A cold box prying seat; 305. a second refrigerant gas-liquid separator;
4. an LNG filling skid-mounted unit; 401. a BOG buffer tank; 402. a BOG vaporizer; 403. an LNG main; 404. a BOG pipeline; 405. filling branch pipes; 406. a gasification branch pipe; 407. an LNG filling pry seat;
5. a pry seat structure; 501. a transverse main beam; 502. a longitudinal main beam; 503. a transverse secondary beam; 504. a longitudinal secondary beam; 505. a steel plate; 506. a base plate; 507. and (4) reinforcing a rib plate.
Detailed Description
For a better understanding of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1, an unconventional shale gas LNG factory preliminary treatment and liquefaction sled dress system, including decarbonization sled dress unit 1, dehydration demercuration sled dress unit 2, cold box sled dress unit 3 and LNG (liquefied natural gas) filling sled dress unit 4, the entry end of decarbonization sled dress unit 1 passes through raw materials natural gas pipeline and links to each other with well site gas collecting device, and the exit end of decarbonization sled dress unit 1 links to each other with the entry end of dehydration demercuration sled dress unit 2 through wet purification gas pipeline, and the exit end of dehydration demercuration sled dress unit 2 links to each other with the entry end of cold box sled dress unit 3 through dry purification gas pipeline, and the exit end of cold box sled dress unit 3 passes through the LNG pipeline and links to each other with the entry end of LNG filling sled dress unit 4.
Preferably, as shown in fig. 2, the decarburization skid-mounted unit 1 comprises a decarburization pry seat 114, and a coalescing filter 101, a decarburization tower 103, a moisture purification gas separator 102 and a regeneration assembly which are mounted on the decarburization pry seat 114; an inlet of the coalescing filter 101 is connected with a raw material natural gas inlet (the raw material natural gas inlet is connected with a raw material natural gas pipeline), and a gas outlet at the top of the coalescing filter 101 is connected with an inlet of the decarbonization tower 103; the top gas outlet of the decarbonization tower 103 is communicated with the inlet of the wet purification gas separator 102 after passing through the wet purification gas cooler 105, the bottom outlet of the decarbonization tower 103 is communicated with the inlet end of the regeneration component through a regeneration pipeline 112, and the upper inlet of the decarbonization tower 103 is communicated with the outlet end of the regeneration component through a reflux pipeline 113; the top outlet of the wet purification gas separator 102 is communicated with a wet purification gas outlet through a pipeline (the wet purification gas outlet is communicated with a wet purification gas pipeline), and the bottom outlet of the wet purification gas separator 102 is communicated with a regeneration pipeline 112; the bottom of the coalescence filter 101 is connected with a sewage discharge pipeline, and the raw material natural gas inlet, the wet purified gas outlet and the sewage discharge outlet of the sewage discharge pipeline are respectively arranged on the side part of the decarburization pry seat 114.
In this embodiment, the cold source fluid of the wet purified gas cooler 105 is cooling water, the cold source inlet of the wet purified gas cooler 105 is communicated with the circulating cooling water inlet through a pipeline, the cold source outlet of the wet purified gas cooler 105 is communicated with the circulating cooling water inlet through a pipeline, and the circulating cooling water inlet and the circulating cooling water outlet are respectively disposed on one side of the decarburization pry seat 114.
Preferably, the regeneration assembly comprises a lean-rich liquid heat exchanger 107, an amine liquid regeneration tower 110 and an amine liquid cooler 106, wherein a cold source inlet of the lean-rich liquid heat exchanger 107 is communicated with an outlet end of a regeneration pipeline 112, a cold source outlet of the lean-rich liquid heat exchanger 107 is connected with an upper inlet of the amine liquid regeneration tower 110 through a pipeline, an upper water inlet/outlet of the amine liquid regeneration tower 110 is communicated with a circulating cooling water pipeline, a bottom lean liquid outlet of the amine liquid regeneration tower 110 is communicated with a hot source inlet of the lean-rich liquid heat exchanger 107 through a pipeline, a hot source outlet of the lean-rich liquid heat exchanger 107 is communicated with a hot source inlet of the amine liquid cooler 106 through a pipeline, a hot source outlet of the amine liquid cooler 106 is communicated with an inlet of the filter assembly through a pipeline, and an outlet of the filter assembly is communicated with a return pipeline. An amine-rich liquid outlet at the lower part of the amine liquid regeneration tower 110 is communicated with a bottom inlet of the reboiler 111, an upper gas phase outlet of the reboiler 111 is communicated with a lower gas phase inlet of the amine liquid regeneration tower 110, and a bottom liquid phase outlet of the reboiler 111 is communicated with a lower liquid phase inlet of the amine liquid regeneration tower 110. The amine liquid cooler 106 is a plate-fin cooler, and the lean-rich liquid heat exchanger 107 is a plate-fin heat exchanger; a heat transfer oil outlet and a heat transfer oil inlet of the reboiler 111 are correspondingly connected to a heat transfer oil inlet and a heat transfer oil outlet provided at a side portion of the decarburization pry base 114, respectively.
In this embodiment, the filtering assembly includes an activated carbon filter 108 and a mechanical filter 109 connected in sequence, the heat source outlet of the amine liquid cooler 106 is connected to the inlet of the activated carbon filter 108 through a pipeline, the outlet of the activated carbon filter 108 is communicated with the inlet of the mechanical filter 109, the outlet of the mechanical filter 109 is connected to two branch pipelines, and the outlets of the two branch pipelines are communicated with the return pipeline; the two branch pipelines are respectively provided with an amine liquid circulating pump 104.
Preferably, as shown in fig. 5, the dehydration and demercuration skid-mounted unit 2 comprises a dehydration and demercuration skid base 210, and a pre-filter 201, a first dehydration tower 203, a second dehydration tower 205, a demercuration tower 204 and a post-filter 202 which are mounted on the dehydration and demercuration skid base 210, wherein an inlet of the pre-filter 201 is communicated with a wet purification gas inlet through a pipeline (the wet purification gas inlet is communicated with a wet purification gas pipeline), and an outlet of the pre-filter 201 is communicated with a top inlet of the first dehydration tower 203 and a top inlet of the second dehydration tower 205 through pipelines respectively; the bottom outlet of the first dehydrating tower 203 and the bottom outlet of the second dehydrating tower 205 are respectively communicated with a first pipeline; the first pipeline is communicated with a top inlet of the demercuration tower 204, a bottom outlet of the demercuration tower 204 is communicated with a lower inlet of the post-filter 202, and an upper outlet of the post-filter 202 is communicated with a dry purified gas outlet through a pipeline (the dry purified gas outlet is communicated with a dry purified gas pipeline); the wet purified gas inlet and the dry purified gas outlet are respectively arranged at the side parts of the dehydration and demercuration pry seat 210.
Preferably, the dehydration and demercuration skid-mounted unit 2 further comprises a regeneration gas cooler, a regeneration gas separator 207 and a compression pump which are arranged on the dehydration and demercuration skid base 210, an outlet of the pre-filter 201 is communicated with a heat source inlet of the regeneration gas cooler 206 through a pipeline, a heat source outlet of the regeneration gas cooling gas is communicated with an inlet of the regeneration gas separator 207, a cold source inlet of the regeneration gas cooling gas is communicated with a circulating cooling water inlet through a pipeline, and a cold source outlet of the regeneration gas cooler 206 is communicated with a circulating cooling water outlet through a pipeline; the top gas outlet of the regeneration gas separator 207 is communicated with the inlet of the compressor 208, and the gas outlet of the compressor 208 is communicated with the wet purified gas inlet through a pipeline; the bottom outlet of the regeneration gas separator 207 is communicated with a sewage draining outlet; the circulating cooling water inlet, the circulating cooling water outlet and the sewage outlet are respectively arranged at the side part of the dehydration and demercuration pry seat 210.
Preferably, the dehydration and demercuration skid-mounted unit 2 further comprises a regeneration gas electric heater 209, the dry purified gas outlet is communicated with the inlet of the regeneration gas electric heater 209 through a second pipeline, and the outlet of the regeneration gas electric heater 209 is communicated with the first pipeline.
In the utility model, as shown in fig. 8, the cold box skid-mounted unit 3 comprises a cold box skid seat 304, and a primary heat exchanger 301 and a secondary heat exchanger 302 which are arranged on the cold box skid seat 304, wherein a heat source inlet of the primary heat exchanger 301 is communicated with a dry purified gas inlet through a pipeline, a heat source outlet of the primary heat exchanger 301 is communicated with a heat source inlet of the secondary heat exchanger 302, and a heat source outlet of the secondary heat exchanger 302 is communicated with an LNG outlet through a pipeline; the dry purge gas inlet and LNG outlet are located on the side of cold box skid base 304. The primary heat exchanger 301 and the secondary heat exchanger 302 are both plate-fin heat exchangers.
In this embodiment, the cold box skid-mounted unit 3 further includes a first refrigerant gas-liquid separator 303 and a second refrigerant gas-liquid separator 305, a refrigerant inlet pipeline of the first refrigerant gas-liquid separator 303 is respectively communicated with a refrigerant outlet pipeline throttled by the first-stage heat exchanger 301 and a refrigerant outlet pipeline of the second-stage heat exchanger 302, and a top refrigerant outlet pipeline and a bottom refrigerant outlet pipeline of the first refrigerant gas-liquid separator 303 are communicated; an inlet pipeline of the second refrigerant gas-liquid separator 305 is communicated with a refrigerant outlet pipeline throttled by the second-stage heat exchanger 302, a top refrigerant outlet pipeline and a bottom refrigerant outlet pipeline of the second refrigerant gas-liquid separator 305 are communicated, and the bottom refrigerant outlet pipeline is communicated with a refrigerant liquid-phase outlet of the cold box skid-mounted unit 3.
Preferably, as shown in fig. 11, the LNG filling skid unit 4 includes an LNG filling skid seat 407, and an LNG main pipe 403, a plurality of filling branch pipes 405, a plurality of vaporizing branch pipes 406, a BOG (flash vapor) pipe 404, a BOG vaporizer 402, and a BOG buffer tank 401 mounted on the LNG filling skid seat 407; the LNG main pipe 403 is connected with an LNG inlet arranged on one side of the LNG filling pry seat 407, an inlet of each filling branch pipe 405 and an inlet of each gasification branch pipe 406 are respectively communicated with the LNG main pipe, and an outlet of each filling branch pipe 405 is connected with an LNG filling port arranged on the other side of the LNG filling pry seat 407; the inlet of the BOG pipeline 404 is connected with the BOG inlet arranged on the side of the LNG filling pry seat 407, the inlet of the BOG pipeline 404 and the outlet of the gasification branch pipe 406 are communicated with the inlet of the BOG vaporizer 402 respectively, the inlet of the BOG buffer tank 401 is communicated with the outlet of the BOG vaporizer 402, and the outlet of the BOG buffer tank 401 is communicated with the fuel gas interface arranged on the side of the LNG filling pry seat 407 through a pipeline.
Preferably, as shown in fig. 3 and 4, fig. 6 and 7, fig. 9 and 10, fig. 12 and 13, the decarbonization pry seat 114, the dehydration and mercury removal pry seat 210, the LNG filling pry seat 407 and the cold box pry seat 304 are different in size, and the pry seat structures 5 are the same and respectively comprise a frame and a steel plate 505 fixed on the frame; the frame is of a steel structure and is formed by enclosing and connecting a transverse main beam 501 and a longitudinal main beam 502, and a plurality of transverse secondary beams 503 and longitudinal secondary beams 504 are arranged in the frame at intervals. Backing plates 506 are additionally arranged at four corners of the LNG filling pry seat 407, and reinforcing rib plates 507 for connection are arranged between the backing plates 506 and the transverse main beam 501 or the longitudinal main beam 502 of the frame; the backing plate 506 is provided with a connecting bolt hole so as to install and fix the cold box prying seat 304 through a bolt. In this embodiment, each of the primary beams and the secondary beams may be made of a steel such as H-shaped steel.
In this embodiment, each device is an existing mature device, and is not described here again.
The utility model discloses the setting is near shale gas field edge well site, and is continuous with well site gas collecting device's raw materials natural gas pipeline. The utility model discloses a concrete theory of operation as follows:
1. the decarburization skid-mounted unit 1 is used for decarburization processing of raw natural gas:
the raw material natural gas enters a coalescing filter 101 of a decarburization skid-mounted unit 1, mechanical impurities and large-particle liquid drops are removed through a filter screen and then flow out from a top outlet of the coalescing filter 101, the raw material natural gas enters the lower part of a decarburization tower 103, and the raw material natural gas contacts with an activated MDEA (methyldiethanolamine) solvent from top to bottom from bottom to top in the decarburization tower 103 in a countercurrent manner to remove CO 2 Removal of CO 2 And the wet purified gas flows out from the top of the decarbonization tower 103, enters a wet purified gas heat exchanger 105 for heat exchange, enters a wet purified gas separator 102 for liquid separation, and is sent to the dehydration and demercuration skid-mounted unit 2. Absorption of CO 2 The rich amine solution flows out from an outlet at the bottom of the decarbonization tower 103, enters the lean and rich solution heat exchanger 107 to exchange heat with the regenerated lean amine solution, then enters the amine solution regeneration tower 110 to be regenerated, the regeneration heat source is heat conduction oil, the regenerated lean amine solution enters the lean and rich solution heat exchanger 107 to exchange heat with the rich amine solution, then enters the amine solution cooler 106 to be cooled, then enters the activated carbon filter 108 and the mechanical filter 109 to be filtered and purified, and then enters the decarbonization tower 103 to complete the regeneration cycle of the solvent after being lifted by the amine solution circulating pump 104.
2. The dehydration and demercuration skid-mounted unit 2 is used for performing dehydration and demercuration treatment on the decarbonized natural gas:
wet purified gas from the decarburization skid-mounted unit 1 enters a pre-filter 201 of a dehydration and demercuration skid-mounted unit 2 to separate liquid free water, then enters a dehydration tower 203/205 (when one tower is used for adsorption, the other tower is regenerated) from top to bottom to be subjected to deep dehydration and drying by adsorption, dry purified gas after dehydration and drying flows out from the bottom of the dehydration tower 203/205, enters a demercuration tower 204 to be subjected to demercuration treatment, and flows out from the bottom of the demercuration tower 204, enters a post-filter 202 to be filtered to remove demercuration agent dust, and then is sent to a cold box skid-mounted unit 3. The regeneration gas of the dehydration adsorbent is taken from dry purified gas, the dry purified gas enters the dehydration tower 203/205 from the bottom after entering the regeneration gas electric heater 209 for heating, the hot dry purified gas flows out from the top of the dehydration tower 203/205 after heating and regenerating the dehydration adsorbent, enters the regeneration gas cooler 206 for cooling and then enters the regeneration gas separator 207 for gas-liquid separation, and the regeneration gas after liquid separation enters the regeneration gas compressor 208 for pressurization and then returns to the inlet pipeline of the pre-filter 201 to complete the regeneration gas circulation.
3. The cold box skid-mounted unit 3 is used for cooling the dehydrated and demercurated natural gas:
and the dry purified gas from the dehydration and demercuration skid-mounted unit 2 enters a primary heat exchanger 301 of a cold box skid-mounted unit 3 for primary heat exchange, then enters a secondary heat exchanger 302 for continuous heat exchange, and is subjected to two-stage heat exchange for precooling and liquefaction, and finally is subcooled out of the cold box, and then is throttled and depressurized to obtain an LNG product which enters an LNG filling skid-mounted unit 4. The liquid-phase high-pressure refrigerant enters the first-stage heat exchanger 301 for heat exchange and throttling, then enters the first refrigerant gas-liquid separator 303 for gas-liquid separation, the separated gas phase and the liquid-phase refrigerant are re-mixed and then enter the first-stage heat exchanger 301 again for heat exchange, and then flows out from the refrigerant gas-phase outlet; the gas-phase high-pressure refrigerant enters a first-stage heat exchanger 301 for heat exchange, then enters a second-stage heat exchanger 302 for heat exchange and throttling, then enters a second refrigerant gas-liquid separator 305 for gas-liquid separation, and after the separated gas-phase refrigerant and liquid-phase refrigerant are mixed again, the gas-phase refrigerant and the liquid-phase refrigerant enter the second-stage heat exchanger 302 again for heat exchange, and then enter a first refrigerant gas-liquid separator 303.
4. The LNG filling skid-mounted unit 4 is used for filling and BOG (flash vapor) recovery of finished product LNG:
the LNG product from the cold box skid-mounted unit 3 enters an LNG main pipe of the LNG filling skid-mounted unit 4 and enters an LNG loading arm through a filling branch pipe to be filled into an LNG tank truck. And the BOG discharged from the LNG header pipe by overpressure and the BOG of the LNG tank truck are recycled to the vaporizer to be fed to a fuel gas system.
In this embodiment, because the natural gas liquefaction has a high requirement on the content of the components of carbon dioxide, water, and mercury, the decarbonizing tower specifically removes the carbon dioxide in the feed gas by using a high-efficiency activated MDEA (methyldiethanolamine) solvent, and the concentration of the carbon dioxide in the wet purified gas after decarbonization is lower than 50 ppm. The dehydration tower adopts a 4A molecular sieve bed layer as a dehydrated adsorbent, and the saturated water content of the deeply dehydrated and dried natural gas is lower than 1ppm; the 4A molecular sieve is adopted for dehydration, the dehydration efficiency is high, and the deep cooling requirement at minus 162 ℃ can be met. Other dewatering methods are as follows: the freeze separation dehydration method is mainly used for avoiding hydrate of natural gas at low temperature, but the low temperature allowed by the freeze separation dehydration method is limited, and the requirement of natural gas liquefaction cannot be met; solvent absorption dehydration (triethylene glycol is commonly used), the dehydration depth is low, and the solvent absorption dehydration can not be used in a cryogenic device. The demercuration tower specifically adopts a sulfur-carrying molecular sieve (multilayer bed) as a demercuration adsorbent, and the mercury content of the dried gas after demercuration is lower than 0.01 mu g/Nm 3 (ii) a The demercuration effect is better, the process device is simple, and the demercuration agent is more economical compared with other silver-loaded molecular sieves and patented demercuration agents, and is more suitable for small-scale LNG liquefaction plants.
Finally, it should be noted that the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments can be modified or part of the technical features can be replaced equally, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an unconventional shale gas LNG mill preliminary treatment and liquefaction sled dress system, a serial communication port, including decarbonization sled dress unit, dehydration demercuration sled dress unit, cold box sled dress unit and LNG filling sled dress unit, the entry end of decarbonization sled dress unit passes through raw materials natural gas pipeline and links to each other with well site gas collecting device, and the exit end of decarbonization sled dress unit links to each other with the entry end of dehydration demercuration sled dress unit through wet purification gas pipeline, and the exit end of dehydration demercuration sled dress unit links to each other with the entry end of cold box sled dress unit through dry purification gas pipeline, and the exit end of cold box sled dress unit passes through the LNG pipeline and links to each other with the entry end of LNG filling sled dress unit.
2. The unconventional shale gas LNG plant pretreatment and liquefaction skid system of claim 1, wherein the decarbonization skid unit comprises a decarbonization skid base, and a coalescing filter, a decarbonization column, a wet scrubbing gas separator, and a regeneration assembly mounted on the decarbonization skid base; an inlet of the coalescing filter is connected with a raw material natural gas inlet, and a gas outlet at the top of the coalescing filter is connected with an inlet of the decarbonization tower; a top gas outlet of the decarbonization tower is communicated with an inlet of the wet purification gas separator after passing through the wet purification gas cooler, a bottom outlet of the decarbonization tower is communicated with an inlet end of the regeneration assembly through a regeneration pipeline, and an upper inlet of the decarbonization tower is communicated with an outlet end of the regeneration assembly through a return pipeline; the top outlet of the wet purification gas separator is communicated with the wet purification gas outlet through a pipeline, and the bottom outlet of the wet purification gas separator is communicated with a regeneration pipeline; coalescence filter bottom is connected with sewage pipes, the lateral part of locating decarbonization sled seat is equallyd divide to raw materials natural gas import, wet purification gas export to and sewage pipes's drain.
3. The unconventional shale gas LNG plant pretreatment and liquefaction skid-mounted system of claim 2, wherein the regeneration assembly comprises a lean-rich liquid heat exchanger, an amine liquid regeneration tower and an amine liquid cooler, a cold source inlet of the lean-rich liquid heat exchanger is communicated with an outlet end of a regeneration pipeline, a cold source outlet of the lean-rich liquid heat exchanger is connected with an upper inlet of the amine liquid regeneration tower through a pipeline, an upper water inlet/outlet of the amine liquid regeneration tower is communicated with a circulating cooling water pipeline, a bottom lean liquid outlet of the amine liquid regeneration tower is communicated with a heat source inlet of the lean-rich liquid heat exchanger through a pipeline, a heat source outlet of the lean-rich liquid heat exchanger is communicated with a heat source inlet of the amine liquid cooler through a pipeline, a heat source outlet of the amine liquid cooler is communicated with an inlet of a filtering assembly through a pipeline, and an outlet of the filtering assembly is communicated with a return pipeline; the lower rich amine liquid outlet of the amine liquid regeneration tower is communicated with the bottom inlet of the reboiler, the upper gas phase outlet of the reboiler is communicated with the lower gas phase inlet of the amine liquid regeneration tower, and the bottom liquid phase outlet of the reboiler is communicated with the lower liquid phase inlet of the amine liquid regeneration tower.
4. The unconventional shale gas LNG plant pretreatment and liquefaction skid system of claim 2, wherein the dehydration demercuration skid unit comprises a dehydration demercuration skid base, and a pre-filter, a first dehydration tower, a second dehydration tower, a demercuration tower and a post-filter which are mounted on the dehydration demercuration skid base, wherein an inlet of the pre-filter is communicated with the wet purified gas inlet through a pipeline, and an outlet of the pre-filter is communicated with a top inlet of the first dehydration tower and a top inlet of the second dehydration tower through pipelines, respectively; the bottom outlet of the first dehydrating tower and the bottom outlet of the second dehydrating tower are respectively communicated with a first pipeline; the first pipeline is communicated with a top inlet of the demercuration tower, a bottom outlet of the demercuration tower is communicated with a lower inlet of the post-filter, and an upper outlet of the post-filter is communicated with a dry purified gas outlet through a pipeline; the wet purified gas inlet and the dry purified gas outlet are respectively arranged on the lateral parts of the dehydration and demercuration pry seat.
5. The pretreatment and liquefaction skid-mounted system of the unconventional shale gas LNG plant of claim 4, wherein the dehydration and demercuration skid-mounted unit further comprises a regeneration gas cooler, a regeneration gas separator and a compression pump which are arranged on the dehydration and demercuration skid seat, an outlet of the pre-filter is communicated with a heat source inlet of the regeneration gas cooler through a pipeline, a heat source outlet of the regeneration gas cooling gas is communicated with an inlet of the regeneration gas separator, a cold source inlet of the regeneration gas cooling gas is communicated with a circulating cooling water inlet through a pipeline, and a cold source outlet of the regeneration gas cooler is communicated with a circulating cooling water outlet through a pipeline; the top gas outlet of the regeneration gas separator is communicated with the inlet of the compressor, and the gas outlet of the compressor is communicated with the wet purified gas inlet through a pipeline; the bottom outlet of the regeneration gas separator is communicated with a sewage draining outlet; and the circulating cooling water inlet, the circulating cooling water outlet and the sewage outlet are respectively arranged at the side part of the dehydration and demercuration pry seat.
6. The unconventional shale gas LNG plant pretreatment and liquefaction skid system of claim 4, wherein the dehydration mercury removal skid unit further comprises a regeneration gas electric heater, the dry purge gas outlet is in communication with an inlet of the regeneration gas electric heater via a second conduit, and an outlet of the regeneration gas electric heater is in communication with the first conduit.
7. The unconventional shale gas LNG plant pretreatment and liquefaction skid-mounted system of claim 4, wherein the cold box skid-mounted unit comprises a cold box skid seat, and a primary heat exchanger and a secondary heat exchanger mounted on the cold box skid seat, a heat source inlet of the primary heat exchanger is communicated with the dry purified gas inlet through a pipeline, a heat source outlet of the primary heat exchanger is communicated with a heat source inlet of the secondary heat exchanger, and a heat source outlet of the secondary heat exchanger is communicated with the LNG outlet through a pipeline; the side part of cold box sled seat is located to dry purified gas import and LNG export, one-level heat exchanger and second grade heat exchanger are plate-fin heat exchanger.
8. The unconventional shale gas LNG plant pretreatment and liquefaction skid system of claim 7, wherein the LNG filling skid unit comprises an LNG filling skid base, and an LNG main, a plurality of filling branch pipes, a plurality of gasification branch pipes, BOG piping, a BOG vaporizer, and a BOG surge tank mounted on the LNG filling skid base; the LNG main pipe is connected with an LNG inlet arranged on one side of the LNG filling pry seat, an inlet of each filling branch pipe and an inlet of each gasification branch pipe are respectively communicated with the LNG main pipe, and an outlet of each filling branch pipe is connected with an LNG filling port arranged on the other side of the LNG filling pry seat; the entry of BOG pipeline links to each other with the BOG import of locating LNG filling sled seat lateral part, and the entry of BOG pipeline and the export of gasification branch pipe are equallyd divide respectively with the entry intercommunication of BOG vaporizer, and the entry of BOG buffer tank communicates with the export of BOG vaporizer, and the export of BOG buffer tank passes through the pipeline and communicates with the fuel gas interface of locating LNG filling sled seat lateral part.
9. The unconventional shale gas LNG plant pretreatment and liquefaction skid system of claim 8, wherein the decarbonization skid, dehydration demercuration skid, LNG filling skid, and cold box skid each comprise a frame, and a steel plate secured to the frame; the frame is of a steel structure and is formed by connecting a transverse main beam and a longitudinal main beam in an enclosing manner, and a plurality of transverse secondary beams and longitudinal secondary beams are arranged in the frame at intervals.
10. The unconventional shale gas LNG plant pretreatment and liquefaction skid-mounted system of claim 9, wherein backing plates are added at four corners of the LNG filling skid seat, and reinforcing ribs are connected between the backing plates and the transverse main beams or the longitudinal main beams of the frame; and the base plate is provided with a connecting bolt hole so as to install and fix the cold box prying seat through a bolt.
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| CN202221560668.8U CN217929404U (en) | 2022-06-21 | 2022-06-21 | Unconventional shale gas LNG factory pretreatment and liquefaction skid-mounted system |
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| CN202221560668.8U CN217929404U (en) | 2022-06-21 | 2022-06-21 | Unconventional shale gas LNG factory pretreatment and liquefaction skid-mounted system |
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