CN214746762U - Novel natural gas pressure reduction power generation system - Google Patents
Novel natural gas pressure reduction power generation system Download PDFInfo
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- CN214746762U CN214746762U CN202023086070.3U CN202023086070U CN214746762U CN 214746762 U CN214746762 U CN 214746762U CN 202023086070 U CN202023086070 U CN 202023086070U CN 214746762 U CN214746762 U CN 214746762U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 282
- 239000003345 natural gas Substances 0.000 title claims abstract description 141
- 238000010248 power generation Methods 0.000 title claims abstract description 56
- 230000009467 reduction Effects 0.000 title claims description 7
- 238000000926 separation method Methods 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 239000007791 liquid phase Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 17
- 230000008929 regeneration Effects 0.000 claims abstract description 3
- 238000011069 regeneration method Methods 0.000 claims abstract description 3
- 239000012071 phase Substances 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 2
- 239000003949 liquefied natural gas Substances 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0232—Coupling of the liquefaction unit to other units or processes, so-called integrated processes integration within a pressure letdown station of a high pressure pipeline system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The novel natural gas pressure-reducing power generation system comprises a drying and purifying unit, a cooling and separating unit, a liquefied storage unit and an expansion power generation unit which are sequentially arranged, wherein compressed natural gas sequentially passes through the drying and purifying unit, the cooling unit, a high-pressure separation tank and the expansion power generation unit, and then is subjected to heat regeneration and then is merged into a resident natural gas pipe network; meanwhile, the liquid-phase natural gas is extracted by using a high-pressure separation tank, and the liquid-phase natural gas is extracted into a liquefied storage tank; according to the scheme, the compressed natural gas is decompressed by the methods of drying, cooling, separating and backheating, so that the compressed natural gas can be decompressed to required pressure and provided for a natural gas pipe network, LNG (liquefied natural gas) can be manufactured, and great promotion effect is achieved on good economic benefit.
Description
Technical Field
The utility model relates to compressed natural gas's step-down field specifically is a novel natural gas step-down power generation system.
Background
The compressed natural gas is obtained by pressurizing low-pressure natural gas to 10-25 MPa through a compressor, so that the molecular density of the compressed natural gas is increased, and long-distance transportation is facilitated; at present, natural gas used by users is low-pressure natural gas, so that before entering an urban resident natural gas pipe network, the compressed natural gas is required to be depressurized, and the depressurized compressed natural gas is allowed to enter a pipeline only when the depressurized compressed natural gas reaches 0.4-1.5 MPa allowed by the urban pipe network.
The compressed natural gas is decompressed to low-pressure natural gas, and the natural gas pressure regulating station generally adopts a pressure regulating device to perform decompression operation directly, so that huge pressure energy is wasted and is not effectively utilized; therefore, how to effectively and reasonably utilize the pressure energy of the compressed natural gas and simultaneously reduce the pressure of the compressed natural gas into low-pressure natural gas is a problem to be solved by workers of the existing pressure regulating station.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a technical scheme, not only can realize obtaining abundant utilization at CNG depressurization in-process to its high pressure energy through this technical scheme, the liquefied natural gas that produces in the collection depressurization in-process that can also be abundant.
The utility model provides a technical scheme as follows:
the novel natural gas pressure-reducing power generation system comprises a drying and purifying unit, a cooling and separating unit, a liquefaction storage unit and an expansion power generation unit which are arranged in sequence,
the cooling separation unit comprises a first-stage cold box, a refrigerating unit, a second-stage cold box and a high-pressure separation tank which are arranged step by step, and compressed natural gas passes through the drying purification unit, then sequentially passes through the first-stage cold box, the refrigerating unit and the second-stage cold box, is cooled step by step and then enters the high-pressure separation tank;
the high-pressure separation tank is respectively communicated with the liquefaction storage unit and the expansion power generation unit, and the high-pressure separation tank is used for realizing gas-liquid separation of the compressed natural gas so as to form gas-phase natural gas and liquid-phase natural gas; the gas phase natural gas is led to the expansion power generation unit, and the liquid phase natural gas is led to the liquefaction storage unit;
the expansion power generation unit is respectively communicated with a residential natural gas pipe network and a power grid, compressed natural gas enters the expansion power generation unit to reduce the pressure and simultaneously enable the expansion power generation unit to generate power, the reduced low-pressure natural gas is subjected to heat regeneration and then is introduced into the residential natural gas pipe network, and the generated electric energy is transmitted to the power grid.
Further, the expansion power generation unit comprises a nozzle ring, an impeller and a generator, wherein a gas inlet of the nozzle ring is communicated with a gas phase outlet of the high-pressure separation tank, and a gas outlet of the nozzle ring is communicated with a gas inlet of the impeller; the power output end of the impeller is in transmission connection with the generator, and the generator is communicated with a power grid through a grid-connected device; and a gas outlet of the expansion power generation unit is communicated with a residential natural gas pipe network.
Further, the nozzle ring is an automatic adjustable nozzle ring.
Furthermore, a hot edge channel and a cold edge channel are arranged in the primary cooling box and the secondary cooling box, and the compressed natural gas passing through the drying and purifying unit sequentially passes through the hot edge channel of the primary cooling box, the refrigerating unit and the hot edge channel of the secondary cooling box and then enters the high-pressure separation tank; and the low-pressure natural gas after being decompressed by the expansion power generation unit sequentially passes through the cold edge channel of the secondary cold box and the cold edge channel of the primary cold box to be reheated step by step and then enters the residential natural gas pipe network.
Furthermore, the expansion power generation unit also comprises a low-pressure separation tank, low-pressure natural gas passes through the low-pressure separation tank and then enters the cold side channel of the secondary cold box, and the low-pressure separation tank is communicated with the liquefaction storage unit.
Further, the liquefaction storage unit includes low temperature LNG pump and liquefaction storage tank, high-pressure knockout drum, low pressure knockout drum with low temperature LNG pump is parallelly connected and is met, the low temperature LNG pump is arranged in pumping the liquid phase natural gas in high-pressure knockout drum, the low pressure knockout drum into in the liquefaction storage tank.
The beneficial effect that adopts this technical scheme to reach does:
according to the scheme, the compressed natural gas is decompressed by the methods of drying, cooling, separating and backheating, so that the compressed natural gas can be decompressed to required pressure and provided for a natural gas pipe network, LNG (liquefied natural gas) can be manufactured, and great promotion effect is achieved on good economic benefit.
By applying the power generation system, the utility model also provides a liquefied natural gas extraction method, including following step:
a. purifying the compressed natural gas by a drying and purifying unit;
b. precooling the purified compressed natural gas through a hot-edge channel of a primary cold box;
c. carrying out shallow cooling on the precooled compressed natural gas through a refrigerating unit;
d. the slightly cooled compressed natural gas is recooled through a hot edge channel of a secondary cooling box;
e. introducing the recooled compressed natural gas into a high-pressure separation tank to realize gas-liquid separation, and forming gas-phase natural gas and liquid-phase natural gas in the high-pressure separation tank;
f. pumping the liquid-phase natural gas formed in the step e into a liquefied storage tank under the action of a low-temperature LNG pump;
g. e, introducing the gas-phase natural gas formed in the step e into an expansion power generation unit, so that the gas-phase natural gas applies work to an impeller in the expansion power generation unit and reduces the pressure, and the impeller applies work to drive a generator to generate power; introducing the decompressed natural gas into a low-pressure separation tank for gas-liquid separation again;
h. pumping the liquid-phase natural gas formed in the step g into a liquefied storage tank under the action of a low-temperature LNG pump;
i. g, preheating the low-pressure gas-phase natural gas formed in the step g through a cold side channel of the secondary cold box in sequence;
J. and the preheated low-pressure gas-phase natural gas is reheated through a cold edge channel of the primary cold box and then is introduced into a natural gas pipe network of urban residents.
Drawings
FIG. 1 is a flow chart of the operation of a natural gas depressurization power generation system.
Wherein: the system comprises a 10 drying and purifying unit, a 21 primary cooling box, a 22 refrigerating unit, a 23 secondary cooling box, a 30 high-pressure separation tank, a 40 liquefaction storage unit, a 41 low-temperature LNG pump, a 42 liquefaction storage tank, a 50 expansion power generation unit, a 51 nozzle ring, a 52 impeller, a 53 power generator, a 54 grid-connected device and a 60 low-pressure separation tank.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
This embodiment provides a novel natural gas step-down power generation system, utilizes this power generation system to solve and has the problem of extravagant compressed natural gas pressure energy among the prior art, through the power generation system who adopts this embodiment to provide, realizes converting compressed natural gas into the make full use of the energy that produces in the low pressure natural gas.
Referring to fig. 1, specifically, the natural gas pressure reduction power generation system includes a drying and purifying unit 10, a cooling and separating unit, a liquefaction storage unit 40 and an expansion power generation unit 50, which are sequentially arranged; the cooling and separating unit comprises a first-stage cold box 21, a refrigerating unit 22, a second-stage cold box 23 and a high-pressure separating tank 30 which are arranged step by step, and the compressed natural gas is purified and dried by the drying and purifying unit 10, then sequentially passes through the first-stage cold box 21, the refrigerating unit 22 and the second-stage cold box 23, is cooled step by step, and then enters the high-pressure separating tank 30 (the arrow direction in the figure is the flowing direction of the compressed natural gas).
The high-pressure separation tank 30 is respectively communicated with the liquefaction storage unit 40 and the expansion power generation unit 50; the high-pressure separation tank 30 is mainly used for performing gas-liquid separation on the compressed natural gas to form gas-phase natural gas and liquid-phase natural gas; where the gas phase natural gas is passed to the expansion power generation unit 50 and the liquid phase natural gas is passed to the liquefaction storage unit 40.
In this embodiment, the liquefied storage unit 40 includes a cryogenic LNG pump 41 and a liquefied storage tank 42, and the liquid-phase natural gas separated in the high-pressure separation tank 30 is pumped into the liquefied storage tank 42 by the cryogenic LNG pump 41 for storage.
The expansion power generation unit 50 comprises a nozzle ring 51, an impeller 52 and a generator 53, wherein a gas inlet of the nozzle ring 51 is communicated with a gas phase outlet of the high-pressure separation tank 30, and a gas outlet of the nozzle ring 51 is communicated with a gas inlet of the impeller 52; the gas-phase natural gas will enter the nozzle ring 51, and under the cooperation of nozzle ring 51, the gas-phase natural gas will be spouted from the gas outlet of nozzle ring 51 and act on impeller 52, and the gas-phase natural gas is expanded and is decompressed through doing work to impeller 52.
In this embodiment, the nozzle ring 51 is an automatically adjustable nozzle ring, and the adjustable nozzle ring is understood to mean that the size of the nozzle ring 51 can be automatically adjusted according to the gas amount of the gas-phase natural gas, so that even if the gas amount of the gas-phase natural gas is different, the size of the nozzle ring 51 is automatically adjusted, the acting force sprayed on the impeller 52 can be almost similar, and thus the decompression efficiency of the whole expansion power generation unit 50 on the gas-phase natural gas and the power generation efficiency of the expansion power generation unit 50 can be effectively ensured.
The gas-phase natural gas performs work expansion on the impeller 52 to realize pressure reduction, and the temperature of the low-pressure natural gas after pressure reduction is also rapidly reduced to about minus 60 ℃ to minus 70 ℃ due to the influence of the coke-soup effect, so that the low-pressure natural gas also needs to be subjected to regenerative treatment before being connected into the residential natural gas pipe network, namely the low-pressure natural gas after pressure reduction is introduced into the residential natural gas pipe network after being subjected to regenerative treatment.
In this embodiment, the heat recovery processing of the low-pressure natural gas is still realized by the primary cooling box 21 and the secondary cooling box 23, that is, the primary cooling box 21 and the secondary cooling box 23 are both provided with a hot edge channel and a cold edge channel, and the compressed natural gas passing through the drying and purifying unit 10 sequentially passes through the hot edge channel of the primary cooling box 21, the refrigerating unit 22 and the hot edge channel of the secondary cooling box 23 and then enters the high-pressure separation tank 30; the low-pressure natural gas expanded and depressurized by the expansion power generation unit 50 sequentially passes through the cold side channel of the second-stage cold box 23 and the cold side channel of the first-stage cold box 21 to be reheated step by step and then enters a residential natural gas pipe network.
The power generation by using the gas phase natural gas is realized by matching the impeller 52 and the generator 53, in this embodiment, the power output end of the impeller 52 is in transmission connection with the generator 53, and the generator 53 is connected with the power grid through the grid-connected device 54.
Therefore, the gas-phase natural gas does work on the impeller 52, so that the gas-phase natural gas is expanded to obtain reduced pressure, meanwhile, the power output end of the impeller 52 is matched with the generator 53 to realize power transmission, the generator 53 works to realize a power generation function, and electric energy generated by the generator 53 is transmitted to a power grid through the grid-connected device 54 to be used.
Optionally, the expansion power generation unit 50 is further provided with a low-pressure separation tank 60, and the low-pressure natural gas passes through the low-pressure separation tank 60 and then enters the cold side channel of the secondary cold box 23, where the low-pressure separation tank 60 is provided to achieve re-separation of the low-pressure natural gas so as to extract the liquid-phase natural gas existing in the low-pressure natural gas.
The low-pressure separation tank 60 is connected to the liquefied storage unit 40, that is, the liquid-phase natural gas outlet of the low-pressure separation tank 60 is connected to the cryogenic LNG pump 41, and the liquid-phase natural gas generated in the low-pressure separation tank 60 is pumped into the liquefied storage tank by the cryogenic LNG pump 41.
According to the scheme, the compressed natural gas is decompressed through the methods of drying, cooling, separating and backheating, so that the compressed natural gas can be decompressed to the required pressure and provided for a natural gas pipe network, LNG (liquefied natural gas) can be manufactured, and great promotion effect is achieved on good economic benefit.
In this embodiment, on the basis of the power generation system, an extraction method of liquefied natural gas can be obtained, where the extraction method includes the following steps:
a. the compressed natural gas is purified by a drying and purifying unit 10;
b. precooling the purified compressed natural gas through a hot-edge channel of the primary cold box 21;
c. the precooled compressed natural gas is subjected to shallow cooling through a refrigerating unit 22;
d. the slightly cooled compressed natural gas is recooled through a hot edge channel of the secondary cooling box 23;
e. introducing the recooled compressed natural gas into a high-pressure separation tank 30 to realize gas-liquid separation, and forming gas-phase natural gas and liquid-phase natural gas in the high-pressure separation tank 30;
f. pumping the liquid-phase natural gas formed in the step e into a liquefied storage tank 42 under the action of a low-temperature LNG pump 41;
g. introducing the gas-phase natural gas formed in the step e into the expansion power generation unit 50, so that the gas-phase natural gas applies work to the impeller 52 in the expansion power generation unit 50 and reduces the pressure, and the impeller 52 applies work to drive the generator 53 to generate power; introducing the decompressed natural gas into the low-pressure separation tank 60 for gas-liquid separation again;
h. pumping the liquid-phase natural gas formed in the step g into a liquefied storage tank 42 under the action of a low-temperature LNG pump 41;
i. preheating the low-pressure gas-phase natural gas formed in the step g through a cold side channel of the secondary cold box 23 in sequence;
J. the preheated low-pressure gas-phase natural gas is reheated through a cold edge channel of the primary cold box 21 and then is introduced into a natural gas pipe network of urban residents.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. The novel natural gas pressure-reducing power generation system comprises a drying and purifying unit (10), a cooling and separating unit, a liquefaction storage unit (40) and an expansion power generation unit (50) which are arranged in sequence,
the cooling separation unit comprises a first-stage cold box (21), a refrigerating unit (22), a second-stage cold box (23) and a high-pressure separation tank (30) which are arranged step by step, and compressed natural gas passes through the drying purification unit (10), then sequentially passes through the first-stage cold box (21), the refrigerating unit (22) and the second-stage cold box (23), is cooled step by step and then enters the high-pressure separation tank (30);
the high-pressure separation tank (30) is respectively communicated with the liquefaction storage unit (40) and the expansion power generation unit (50), and the high-pressure separation tank (30) is used for realizing gas-liquid separation of compressed natural gas so as to form gas-phase natural gas and liquid-phase natural gas; the gas phase natural gas is passed to the expansion power generation unit (50) and the liquid phase natural gas is passed to the liquefaction storage unit (40);
the expansion power generation unit (50) is communicated with a residential natural gas pipe network and a power grid, compressed natural gas enters the expansion power generation unit (50) to be decompressed and enables the expansion power generation unit (50) to generate power, the decompressed low-pressure natural gas is subjected to heat regeneration and then is introduced into the residential natural gas pipe network, and the generated electric energy is transmitted to the power grid.
2. The novel natural gas depressurization power generation system according to claim 1, wherein the expansion power generation unit (50) comprises a nozzle ring (51), an impeller (52) and a generator (53), a gas inlet of the nozzle ring (51) is communicated with a gas phase outlet of the high pressure separation tank (30), a gas outlet of the nozzle ring (51) is communicated with a gas inlet of the impeller (52); the power output end of the impeller (52) is in transmission connection with the generator (53), and the generator (53) is communicated with a power grid through a grid connection device (54); and a gas outlet of the expansion power generation unit (50) is communicated with a residential natural gas pipe network.
3. The novel natural gas pressure reduction power generation system according to claim 2, wherein the nozzle ring (51) is an automatically adjustable nozzle ring.
4. The novel natural gas depressurization power generation system according to claim 1, wherein the primary cooling box (21) and the secondary cooling box (23) are both provided with a hot side passage and a cold side passage, and the compressed natural gas passing through the drying and purifying unit (10) sequentially passes through the hot side passage of the primary cooling box (21), the refrigerating unit (22) and the hot side passage of the secondary cooling box (23) and then enters the high-pressure separation tank (30); the low-pressure natural gas after being depressurized by the expansion power generation unit (50) sequentially passes through the cold side channel of the secondary cold box (23) and the cold side channel of the primary cold box (21) to be reheated step by step and then enters a residential natural gas pipe network.
5. The novel natural gas depressurization power generation system according to claim 4, wherein the expansion power generation unit (50) further comprises a low pressure separation tank (60), and low pressure natural gas passes through the low pressure separation tank (60) and then enters the cold side passage of the secondary cold box (23), and the low pressure separation tank (60) is simultaneously communicated with the liquefaction storage unit (40).
6. The novel natural gas depressurization power generation system according to claim 5, wherein the liquefaction storage unit (40) comprises a cryogenic LNG pump (41) and a liquefaction storage tank (42), the high-pressure separation tank (30) and the low-pressure separation tank (60) are connected in parallel with the cryogenic LNG pump (41), and the cryogenic LNG pump is used for pumping the liquid-phase natural gas in the high-pressure separation tank (30) and the low-pressure separation tank (60) into the liquefaction storage tank (42).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112577261A (en) * | 2020-12-21 | 2021-03-30 | 襄阳航力机电技术发展有限公司 | Novel natural gas pressure reduction power generation system and extraction method of liquefied natural gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112577261A (en) * | 2020-12-21 | 2021-03-30 | 襄阳航力机电技术发展有限公司 | Novel natural gas pressure reduction power generation system and extraction method of liquefied natural gas |
| CN112577261B (en) * | 2020-12-21 | 2024-04-26 | 襄阳航力机电技术发展有限公司 | Natural gas depressurization power generation system and liquefied natural gas extraction method |
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