CN113154251A - LNG (liquefied Natural gas) frost-inhibiting and effect-enhancing air bath type gasification system and method utilizing solar heat pump and air circulation - Google Patents

LNG (liquefied Natural gas) frost-inhibiting and effect-enhancing air bath type gasification system and method utilizing solar heat pump and air circulation Download PDF

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Publication number
CN113154251A
CN113154251A CN202110492975.0A CN202110492975A CN113154251A CN 113154251 A CN113154251 A CN 113154251A CN 202110492975 A CN202110492975 A CN 202110492975A CN 113154251 A CN113154251 A CN 113154251A
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air
lng
pipe
temperature
gasifier
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时国华
田志敏
高宇琪
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North China Electric Power University
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North China Electric Power University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat

Abstract

The invention relates to an LNG (liquefied natural gas) frost-inhibiting and effect-enhancing air bath type gasification system utilizing a solar heat pump and air circulation. The refrigerant absorbs solar radiation and heat in the environment to heat the air in the air supply pipe; the ambient air is dehumidified by the preheater and then flows through the condenser to absorb the heat of the refrigerant, and then enters the fan cover to heat the LNG in the gasifier, the air is further dehumidified, and the cooled and dried air flows into the blast pipe through the return air pipe to form air circulation; a part of LNG flowing out of the storage tank enters a preheater, the LNG flowing out of the preheater is ensured to be in a liquid state by controlling the flow of the LNG, and the preheated LNG is merged into the LNG flowing out of the storage tank; the fan housing provided with the tempered glass generates a greenhouse effect inside. The invention fully utilizes LNG cold energy to reduce the moisture content of the circulating air, utilizes solar energy and air energy to heat the circulating air, creates microclimate suitable for the air-temperature gasifier to restrain frost and run efficiently, is energy-saving and environment-friendly, and has good economic and social benefits.

Description

LNG (liquefied Natural gas) frost-inhibiting and effect-enhancing air bath type gasification system and method utilizing solar heat pump and air circulation
Technical Field
The invention belongs to the technical field of solar heat pump technology and air bath type gasification, and particularly relates to a Liquefied Natural Gas (LNG) frost-inhibiting and efficiency-increasing air bath type gasification system and method utilizing a solar heat pump and air circulation.
Background
Natural gas can be liquefied at-162 c and atmospheric pressure to a colorless and odorless liquid called liquefied natural gas (LNG for short). When LNG is used as a fuel or an industrial raw material, a vaporizer must supply a certain amount of heat to vaporize the LNG into a normal temperature gas state before use.
The air temperature type gasifier gasifies LNG by utilizing air in an atmospheric environment, and when the air temperature is low, the phenomenon of frost accumulation and icing easily occurs on the surface of the gasifier, so that the gasification capacity of the gasifier is seriously influenced. Therefore, two groups of air-temperature gasifiers are used alternately, one group is started to operate when defrosting and deicing are performed, initial investment and occupied area are increased, meanwhile, when the environment temperature is low, natural defrosting is slow and difficult, and a large amount of high-grade energy is consumed for defrosting. In addition, in the process of gasifying LNG by the air-temperature gasifier, water in the air is cooled and easily forms fog around the gasifier, so that the ecological environment and the visible distance around the gasification station are seriously influenced.
Patent No. zl201610067782.x describes a system for gasifying LNG using a solar heat pump, but the following problems exist with this technology: 1. the ambient air is heated only by the air condenser, the temperature of the air is only raised, the moisture content of the air is unchanged, the phase change driving force of water vapor in the air is basically unchanged, and the frost accumulation and the icing are not inhibited from the source; 2. ambient air is heated by the air condenser under the action of the fan and then is sent to the air-temperature gasifier in the atmospheric environment, and hot air is quickly dissipated in an infinite space and is not enough to form ordered air flow among finned tube bundles of the air-temperature gasifier, so that the heat exchange efficiency is reduced; 3. the cold fog phenomenon around the air-temperature type gasifier cannot be solved.
Disclosure of Invention
The invention provides an LNG frost-inhibiting and effect-enhancing air-bath type gasification system and method utilizing a solar heat pump and air circulation, which aims to overcome the technical defects.
The technical scheme for solving the technical problem of the invention is as follows:
an LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing a solar heat pump and air circulation is characterized by comprising a direct expansion type solar heat pump, an air circulation subsystem, an air temperature type preheater 12, an air temperature type gasifier 18, an LNG storage tank 22 and an air supply pipe network 26;
the direct-expansion solar heat pump is characterized in that a heat collecting evaporator 1, a compressor 2, an air condenser 3 and an expansion valve 4 are sequentially connected through pipelines to form a closed refrigerant circulation passage;
the heat collection evaporator 1 is a bare plate type flat plate heat collector and comprises a refrigerant coil and a base plate;
an LNG outlet of the LNG storage tank 22 is connected to an inlet of the LNG bypass pipe 23 and an LNG inlet of the air-temperature vaporizer 18; the outlet of the LNG bypass pipe 23 is connected to the LNG inlet of the air-temperature preheater 12; the LNG outlet of the air-temperature preheater 12 is connected to the inlet of the LNG output pipe 24; the outlet of the LNG output pipe 24 is connected to the LNG inlet of the air-temperature gasifier 18, the natural gas outlet of the air-temperature gasifier 18 is connected to a gas supply pipe network 26 through a natural gas pipe 25, and the natural gas pipe 25 is provided with a temperature measuring device 29 and a closed full-open safety valve 30;
the air circulation subsystem comprises an induced draft pipe 5, an air supply pipe 6, a return air pipe 9, an exhaust pipe 10, a fan cover 8 and a fan 15; the outlet of the induced draft pipe 5 is connected to the inlet of the blast pipe 6, the outlet of the blast pipe 6 is connected to the lower end of the fan housing 8, the inlet of the return air pipe 9 is connected with the top of the fan housing 8, and the outlet of the return air pipe 9 is respectively connected with the inlet of the exhaust pipe 10 and the inlet of the blast pipe 6; the outlet of the exhaust duct 10 and the inlet of the induced draft duct 5 are communicated with the atmospheric environment; the fan 15 is arranged at the inlet of the blast pipe 6; the air-temperature gasifier 18 is arranged in the center of the fan cover 8;
the air condenser 3 and the air temperature type gasifier 18 share one fan 15.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing the solar heat pump and the air circulation is characterized in that the air condenser 3 is a surface heater and is arranged in the blast pipe 6, a refrigerant flows in the heater pipe, and air is pressurized by the fan 15 and then forcibly flows through the outer surface of the heater pipe.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing the solar heat pump and the air circulation is characterized in that the air temperature type preheater 12 is an aluminum finned tube heat exchanger and is arranged in the induced draft tube 5, and LNG flows in the preheater tube.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing the solar heat pump and air circulation is characterized in that a first electric air valve 14, a second electric air valve 16 and a third electric air valve 21 are respectively arranged on the induced air pipe 5, the air supply pipe 6 and the exhaust pipe 10; the inlet of the induced draft pipe 5 and the outlet of the exhaust pipe 10 are respectively provided with a rainproof louver 11; the bottom of the induced draft pipe 5 is provided with an S-shaped water seal 13, the gradient of the bottom is 0.1%, and the slope is towards the S-shaped water seal 13; the outlet of the blast pipe 6 is provided with a blast opening 17; a guide plate 19 is arranged at the inlet elbow of the return air pipe 9, the gradient of the horizontal section of the return air pipe 9 is 0.1%, the slope is towards the air-temperature gasifier 18, and a natural gas leakage alarm 20 is arranged at the high point of the horizontal section of the return air pipe 9.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing the solar heat pump and the air circulation is characterized in that a check valve 28 is respectively arranged on a branch of an LNG outlet of an LNG storage tank 22 connected to an LNG inlet of an air temperature type preheater 12 and an LNG inlet of an air temperature type gasifier 18 so as to ensure that the LNG cannot flow backwards when the pressure in a pipeline is abnormal; an emergency cut-off valve 27 is arranged on an LNG outlet pipeline of the LNG storage tank 22, the distance between the emergency cut-off valve 27 and the air-temperature type gasifier 18 is not less than 15 meters, and the emergency cut-off valve 27 is respectively interlocked with the natural gas leakage alarm 20 and the temperature measuring device 29.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing the solar heat pump and the air circulation is characterized in that the fan cover 8 is made of a stainless steel plate, the overlooking projection of the fan cover 8 is square, a plurality of square holes with equal areas are formed in the south side surface and the top of the fan cover 8, single-layer toughened white glass 31 is installed on the south side surface and the top of the fan cover 8, a closed type access door 32 is arranged on the north side surface of the fan cover 8, an S-shaped water seal 13 is arranged at the bottom of the fan cover 8, the gradient of the bottom is 0.1%, the slope S-shaped water seal 13 is arranged in the slope direction, and the fan cover 8 is fixedly supported through a support 7;
the closed access door 32 is a vertical hinged door which is opened outwards;
the support 7 is made of stainless steel materials, the top of the support 7 is welded to the bottom of the fan cover 8, and the bottom of the support 7 is fixed to the ground through foundation bolts; the number of the brackets 7 is four, the overlooking projection connecting line is square, and the brackets and the overlooking projection of the fan cover 8 form a concentric square.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing the solar heat pump and the air circulation is characterized in that the fan 15 is a variable-frequency explosion-proof fan.
The LNG frost-inhibiting and efficiency-increasing air bath type gasification method utilizing the solar heat pump and the air circulation, it is characterized in that when the air conditioner starts to operate, the first electric air valve 14, the second electric air valve 16, the fan 15 and the compressor 2 are opened, the third electric air valve 21 is closed, ambient air enters the induced draft pipe 5 under the action of the fan 15 and flows through the air temperature type preheater 12 to heat input LNG, condensed water condensed on the surface of the air temperature type preheater 12 in the heating process is discharged through the S-shaped water seal 13, the dehumidified and cooled air flows through the air condenser 3 to be heated, then, the air enters the fan cover 8 from the air supply outlet 17, flows through the air-temperature vaporizer 18 to heat the input LNG to vaporize the LNG, condensed water condensed on the surface of the air-temperature vaporizer 18 by hot air in the gasification process is discharged through the S-shaped water seal 13, and air cooled by the air-temperature vaporizer 18 and further dried flows through the return air pipe 9 to enter the air supply pipe 6 to form air circulation; after the air volume in the blast pipe 6 is stable, the first electric air valve 14 is closed;
the refrigerant releases heat absorbed by the heat collection evaporator 1 from solar radiation and ambient air to the air in the blast pipe 6 through the air condenser 3; solar energy enters the fan housing 8 through the single-layer toughened white glass 31 on the south side surface and the top surface of the fan housing 8 to generate a greenhouse effect and heat air in the fan housing 8;
a part of the LNG flowing out of the LNG storage tank 22 enters the air-temperature preheater 12 to absorb heat of air in the induced draft tube 5, and the LNG flowing out of the air-temperature preheater 12 is ensured to be always in a liquid state by controlling the flow rate of the LNG entering the air-temperature preheater 12; the LNG preheated by the air-temperature preheater 12 is merged into the other LNG flowing out of the LNG storage tank 22, is input into the air-temperature vaporizer 18 for vaporization, and then enters the gas supply pipe network 26 for use after pressure regulation, metering and odorization;
when the air-temperature type gasifier 18 is overhauled, the emergency cut-off valve 27 is closed, and the first electric air valve 14, the third electric air valve 21 and the closed type access door 32 are opened, so that the quality of air in the fan cover 8 is ensured.
The invention has the beneficial effects that:
1. by utilizing the low-temperature characteristic of LNG, the air is subjected to dual dehumidification and drying through the air-temperature preheater and the air-temperature gasifier, and the air can be repeatedly subjected to deep dehumidification by the air-temperature gasifier through the air circulation subsystem, so that the problems of surface frost accumulation and icing of the air-temperature gasifier and the adverse effects caused by the surface frost accumulation and icing of the air-temperature gasifier are solved from the source;
2. the fan cover can enable hot air to form effective airflow organization on the outer surface of the air-temperature gasifier, improve the convection heat transfer coefficient of the air side and improve the heat exchange efficiency of the air-temperature gasifier;
3. the air is deeply dehumidified and dried, and the air temperature type gasifier is arranged in the fan cover, so that the cold fog phenomenon in the gasification station is avoided;
4. the fan cover and the single-layer toughened white glass can generate a greenhouse effect in the fan cover, so that solar energy is more fully utilized, and the heat exchange efficiency of the air-temperature gasifier is improved;
5. the air condenser is arranged in the air supply pipe, air can flow through the air condenser in order at a high speed, the heat exchange effect of the air condenser is good, and the thermal performance of the solar heat pump is improved;
6. according to the gasification load change requirement of the air temperature type gasifier, the variable frequency fan can adjust the air quantity and the air speed in time, and the electric energy consumption of the fan is saved.
Drawings
FIG. 1 is a process diagram of an LNG frost suppression and efficiency enhancement air bath type gasification system utilizing a solar heat pump and air circulation;
FIG. 2 is a view from the south of the fan housing;
FIG. 3 is a view of the east side of the fan housing;
FIG. 4 is a west side view of the hood;
FIG. 5 is a north side view of the fan housing;
fig. 6 is a top view of the fan housing.
Description of reference numerals: 1-a heat collecting evaporator; 2-a compressor; 3-an air condenser; 4-an expansion valve; 5-induced duct; 6-blast pipe; 7-a scaffold; 8-wind cover; 9-air return pipe; 10-an exhaust pipe; 11-rain-proof shutter; 12-air temperature preheater; 13-S type water seal; 14-a first electrically operated air valve; 15-a fan; 16-a second electric air valve; 17-an air supply outlet; 18-air temperature type gasifier; 19-a baffle; 20-LNG leakage monitoring devices; 21-a third electric air valve; 22-LNG storage tanks; 23-LNG by-pass pipes; 24-an LNG output pipe; 25-natural gas pipe; 26-an air supply pipe network; 27-an emergency shut-off valve; 28-check valve; 29-a temperature measuring device; 30-closed full-open safety valve; 31-single-layer toughened white glass; 32-airtight access door.
Detailed Description
The invention is further described with reference to the following figures and detailed description. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
An LNG frost-inhibiting and efficiency-enhancing air bath type gasification system and method using a solar heat pump and air circulation is described below with reference to the accompanying drawings 1 to 6:
as shown in fig. 1, the LNG frost-suppressing and efficiency-increasing air-bath type gasification system using a solar heat pump and air circulation comprises a direct expansion type solar heat pump, an air circulation subsystem, an air-temperature type preheater 12, an air-temperature type gasifier 18, an LNG storage tank 22 and an air supply pipe network 26; the air condenser 3 is a surface heater and is arranged in the blast pipe 6, the refrigerant flows in the heater pipe, and the air is forced to flow through the outer surface of the heater pipe after being pressurized by the fan 15; the air-temperature preheater 12 is an aluminum finned tube heat exchanger and is arranged in the induced draft tube 5, and LNG flows in the preheater tube.
The air circulation subsystem comprises an induced draft pipe 5, an air supply pipe 6, a return air pipe 9, an exhaust pipe 10, a fan cover 8 and a fan 15; the outlet of the induced draft pipe 5 is connected to the inlet of the blast pipe 6, the outlet of the blast pipe 6 is connected to the lower end of the fan housing 8, the inlet of the return air pipe 9 is connected with the top of the fan housing 8, and the outlet of the return air pipe 9 is respectively connected with the inlet of the exhaust pipe 10 and the inlet of the blast pipe 6; the outlet of the exhaust duct 10 and the inlet of the induced draft duct 5 are communicated with the atmospheric environment; the fan 15 is arranged at the inlet of the blast pipe 6; the fan 15 is a variable-frequency explosion-proof fan; the air-temperature gasifier 18 is arranged in the center of the fan cover 8;
the induced draft pipe 5, the blast pipe 6 and the exhaust pipe 10 are respectively provided with a first electric air valve 14, a second electric air valve 16 and a third electric air valve 21; the inlet of the induced draft pipe 5 and the outlet of the exhaust pipe 10 are respectively provided with a rainproof louver 11; the bottom of the induced draft pipe 5 is provided with an S-shaped water seal 13, the gradient of the bottom is 0.1%, and the slope is towards the S-shaped water seal 13; the outlet of the blast pipe 6 is provided with a blast opening 17; a guide plate 19 is arranged at the inlet elbow of the return air pipe 9, the gradient of the horizontal section of the return air pipe 9 is 0.1 percent, the slope is towards the air-temperature gasifier 18, and a natural gas leakage alarm 20 is arranged at the high point of the horizontal section of the return air pipe 9;
an LNG outlet of the LNG storage tank 22 is connected to an inlet of the LNG bypass pipe 23 and an LNG inlet of the air-temperature vaporizer 18; the outlet of the LNG bypass pipe 23 is connected to the LNG inlet of the air-temperature preheater 12; the LNG outlet of the air-temperature preheater 12 is connected to the inlet of the LNG output pipe 24; the outlet of the LNG output pipe 24 is connected to the LNG inlet of the air-temperature gasifier 18, the natural gas outlet of the air-temperature gasifier 18 is connected to a gas supply pipe network 26 through a natural gas pipe 25, and the natural gas pipe 25 is provided with a temperature measuring device 29 and a closed full-open safety valve 30; check valves 28 are respectively arranged on branches of an LNG outlet of the LNG storage tank 22 connected to LNG inlets of the air-temperature preheater 12 and the air-temperature gasifier 18, so as to ensure that the pressure in the pipeline cannot flow backwards when abnormal pressure exists; an emergency cut-off valve 27 is arranged on an LNG outlet pipeline of the LNG storage tank 22, the distance between the emergency cut-off valve 27 and the air-temperature type gasifier 18 is not less than 15 meters, and the emergency cut-off valve 27 is respectively interlocked with the natural gas leakage alarm 20 and the temperature measuring device 29.
As shown in fig. 2-6, the wind shield 8 is made of a stainless steel plate, the top view projection of the wind shield 8 is square, a plurality of square holes with equal area are formed in the south side and the top of the wind shield 8 for installing single-layer tempered white glass 31, a closed access door 32 is arranged on the north side of the wind shield 8, an S-shaped water seal 13 is arranged at the bottom of the wind shield 8, the bottom gradient is 0.1%, the slope direction S-shaped water seal 13 is arranged, and the wind shield 8 is fixedly supported by a support 7; the closed access door 32 is a vertical hinged door which is opened outwards; the support 7 is made of stainless steel materials, the top of the support 7 is welded to the bottom of the fan cover 8, and the bottom of the support 7 is fixed to the ground through foundation bolts; the number of the brackets 7 is four, the overlooking projection connecting line is square, and the brackets and the overlooking projection of the fan cover 8 form a concentric square.
The LNG frost-inhibiting and effect-enhancing air bath type gasification method utilizing the solar heat pump and the air circulation comprises the following steps:
when the air conditioner starts to operate, the first electric air valve 14, the second electric air valve 16, the fan 15 and the compressor 2 are opened, the third electric air valve 21 is closed, ambient air enters the induced air pipe 5 under the action of the fan 15, flows through the air-temperature type preheater 12 to heat input LNG, condensed water condensed on the surface of the air-temperature type preheater 12 in the heating process is discharged through the S-shaped water seal 13, the dehumidified and cooled air flows through the air condenser 3 to be heated, then enters the air hood 8 through the air supply opening 17, flows through the air-temperature type gasifier 18 to heat the input LNG to be gasified, the condensed water condensed on the surface of the air-temperature type gasifier 18 in the gasification process is discharged through the S-shaped water seal 13, is cooled by the air-temperature type gasifier 18, and further dried air flows through the air return pipe 9 to enter the air supply pipe 6 to form air circulation; after the air volume in the blast pipe 6 is stable, the first electric air valve 14 is closed;
the refrigerant releases heat absorbed by the heat collection evaporator 1 from solar radiation and ambient air to the air in the blast pipe 6 through the air condenser 3; solar energy enters the fan housing 8 through the single-layer toughened white glass 31 on the south side surface and the top surface of the fan housing 8 to generate a greenhouse effect and heat air in the fan housing 8;
a part of the LNG flowing out of the LNG storage tank 22 enters the air-temperature preheater 12 to absorb heat of air in the induced draft tube 5, and the LNG flowing out of the air-temperature preheater 12 is ensured to be always in a liquid state by controlling the flow rate of the LNG entering the air-temperature preheater 12; the LNG preheated by the air-temperature preheater 12 is merged into the other LNG flowing out of the LNG storage tank 22, is input into the air-temperature vaporizer 18 for vaporization, and then enters the gas supply pipe network 26 for use after pressure regulation, metering and odorization;
when the air-temperature type gasifier 18 is overhauled, the emergency cut-off valve 27 is closed, and the first electric air valve 14, the third electric air valve 21 and the closed type access door 32 are opened, so that the quality of air in the fan cover 8 is ensured.
The invention can be applied to the occasions such as an LNG receiving terminal, an LNG satellite station, an LNG vaporizing station and the like, and is also suitable for the occasions of various low-temperature medium air bath type gasification.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. An LNG frost-inhibiting and efficiency-increasing air bath type gasification system utilizing a solar heat pump and air circulation is characterized by comprising a direct expansion type solar heat pump, an air circulation subsystem, an air temperature type preheater (12), an air temperature type gasifier (18), an LNG storage tank (22) and an air supply pipe network (26);
the direct-expansion solar heat pump is characterized in that a heat collection evaporator (1), a compressor (2), an air condenser (3) and an expansion valve (4) are sequentially connected through pipelines to form a closed refrigerant circulation passage;
the heat collection evaporator (1) is a bare plate type flat plate heat collector and comprises a refrigerant coil and a base plate;
an LNG outlet of the LNG storage tank (22) is respectively connected with an inlet of an LNG bypass pipe (23) and an LNG inlet of the air-temperature vaporizer (18); the outlet of the LNG bypass pipe (23) is connected to the LNG inlet of the air-temperature preheater (12); an LNG outlet of the air-temperature type preheater (12) is connected to an inlet of an LNG output pipe (24); an outlet of the LNG output pipe (24) is connected to an LNG inlet of the air-temperature gasifier (18), a natural gas outlet of the air-temperature gasifier (18) is connected to a gas supply pipe network (26) through a natural gas pipe (25), and the natural gas pipe (25) is provided with a temperature measuring device (29) and a closed full-open safety valve (30);
the air circulation subsystem comprises an induced draft pipe (5), an air supply pipe (6), an air return pipe (9), an exhaust pipe (10), an air cover (8) and a fan (15); the outlet of the induced draft pipe (5) is connected to the inlet of the blast pipe (6), the outlet of the blast pipe (6) is connected to the lower end of the fan cover (8), the inlet of the return air pipe (9) is connected with the top of the fan cover (8), and the outlet of the return air pipe (9) is respectively connected with the inlet of the exhaust pipe (10) and the inlet of the blast pipe (6); the outlet of the exhaust pipe (10) and the inlet of the induced draft pipe (5) are communicated with the atmospheric environment; the fan (15) is arranged at the inlet of the blast pipe (6); the air-temperature gasifier (18) is arranged in the center of the fan cover (8);
the air condenser (3) and the air temperature type gasifier (18) share one fan (15).
2. An LNG frost-suppressing and efficiency-increasing air bath type gasification system using a solar heat pump and air circulation according to claim 1, characterized in that the air condenser (3) is a surface heater and is disposed in the blast pipe (6), refrigerant flows in the heater pipe, and air is forced to flow over the outer surface of the heater pipe after being pressurized by the blower (15).
3. An LNG frost suppression and efficiency enhancement air bath gasification system using a solar heat pump and air circulation according to claim 1, characterized in that the air temperature type preheater (12) is an aluminum finned tube heat exchanger and is placed in the induced draft tube (5), and LNG flows in the preheater tube.
4. The LNG frost suppressing and efficiency enhancing air bath type gasification system using the solar heat pump and the air circulation as claimed in claim 1, wherein the induced duct (5), the supply duct (6) and the exhaust duct (10) are respectively provided with a first electric air valve (14), a second electric air valve (16) and a third electric air valve (21); the inlet of the induced draft pipe (5) and the outlet of the exhaust pipe (10) are respectively provided with a rainproof shutter (11); an S-shaped water seal (13) is arranged at the bottom of the induced draft pipe (5), the gradient of the bottom is 0.1%, and the slope is towards the S-shaped water seal (13); an outlet of the blast pipe (6) is provided with a blast opening (17); a guide plate (19) is arranged at the inlet elbow of the return air pipe (9), the gradient of the horizontal section of the return air pipe (9) is 0.1 percent, the slope is towards the air-temperature gasifier (18), and a natural gas leakage alarm (20) is arranged at the high point of the horizontal section of the return air pipe (9).
5. The LNG frost suppressing and efficiency enhancing air bath gasification system using the solar heat pump and the air circulation as claimed in claim 1, wherein check valves (28) are respectively disposed on branches of the LNG outlet of the LNG storage tank (22) connected to the LNG inlets of the air temperature pre-heater (12) and the air temperature gasifier (18) to ensure that the pressure in the pipeline will not flow backwards when abnormal pressure occurs; an emergency shut-off valve (27) is arranged on an LNG outlet pipeline of the LNG storage tank (22), the distance between the emergency shut-off valve (27) and the air-temperature gasifier (18) is not less than 15 meters, and the emergency shut-off valve (27) is respectively linked with a natural gas leakage alarm (20) and a temperature measuring device (29).
6. The LNG frost-inhibiting and efficiency-increasing air-bath type gasification system utilizing the solar heat pump and the air circulation is characterized in that the wind shield (8) is made of a stainless steel plate, the overlooked projection of the wind shield (8) is square, a plurality of square holes with equal area are formed in the south side surface and the top of the wind shield (8) to be provided with single-layer tempered white glass (31), a closed type access door (32) is arranged on the north side surface of the wind shield (8), an S-shaped water seal (13) is arranged at the bottom of the wind shield (8), the gradient of the bottom is 0.1%, the slope of the S-shaped water seal (13) is arranged in the slope direction, and the wind shield (8) is fixedly supported through a support (7);
the closed type access door (32) is a vertical hinged door which is opened outwards;
the support (7) is made of stainless steel materials, the top of the support (7) is welded to the bottom of the fan cover (8), and the bottom of the support (7) is fixed to the ground through foundation bolts; the number of the brackets (7) is four, the overlooking projection connecting line is square, and the brackets and the overlooking projection of the fan cover (8) form a concentric square.
7. The LNG frost suppression and efficiency enhancement air bath gasification system using the solar heat pump and the air circulation according to claim 1, wherein the fan (15) is a variable frequency explosion-proof fan.
8. The LNG frost suppressing and efficiency enhancing air bath type gasification method using the solar heat pump and the air circulation as recited in claim 1, wherein at the start of operation, the first electric air valve (14), the second electric air valve (16), the blower (15) and the compressor (2) are opened, the third electric air valve (21) is closed, the ambient air enters the induced draft duct (5) by the blower (15), flows through the air temperature type preheater (12) to heat the incoming LNG, the condensed water condensed on the surface of the air temperature type preheater (12) during the heating process is discharged through the S-shaped water seal (13), the dehumidified and cooled air flows through the air condenser (3) to be heated, then enters the wind hood (8) through the wind supply opening (17), flows through the air temperature type gasifier (18) to heat the incoming LNG to be gasified, the condensed water condensed on the surface of the air temperature type gasifier (18) during the gasification process is discharged through the S-shaped water seal (13), the air cooled by the air temperature type gasifier (18) and further dried flows through the air return pipe (9) and enters the blast pipe (6) to form air circulation; after the air volume in the blast pipe (6) is stable, closing the first electric air valve (14);
the refrigerant releases heat absorbed by the heat collection evaporator (1) from solar radiation and ambient air to air in the blast pipe (6) through the air condenser (3); solar energy enters the fan cover (8) through the single-layer toughened white glass (31) on the south side surface and the top surface of the fan cover (8) to generate a greenhouse effect and heat air in the fan cover (8);
a part of LNG flowing out of the LNG storage tank (22) enters the air-temperature type preheater (12) to absorb the heat of air in the induced draft tube (5), and the LNG flowing out of the air-temperature type preheater (12) is ensured to be always kept in a liquid state by controlling the flow rate of the LNG entering the air-temperature type preheater (12); the LNG preheated by the air-temperature preheater (12) is merged into the other LNG flowing out of the LNG storage tank (22), is input into the air-temperature vaporizer (18) for vaporization, and then enters the gas supply pipe network (26) for use after pressure regulation, metering and odorization;
when the air-temperature type gasifier (18) is overhauled, the emergency cut-off valve (27) is closed, the first electric air valve (14), the third electric air valve (21) and the closed type access door (32) are opened, and the quality of air in the air hood (8) is guaranteed.
CN202110492975.0A 2021-05-07 2021-05-07 LNG (liquefied Natural gas) frost-inhibiting and effect-enhancing air bath type gasification system and method utilizing solar heat pump and air circulation Pending CN113154251A (en)

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CN202110492975.0A CN113154251A (en) 2021-05-07 2021-05-07 LNG (liquefied Natural gas) frost-inhibiting and effect-enhancing air bath type gasification system and method utilizing solar heat pump and air circulation

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CN202110492975.0A CN113154251A (en) 2021-05-07 2021-05-07 LNG (liquefied Natural gas) frost-inhibiting and effect-enhancing air bath type gasification system and method utilizing solar heat pump and air circulation

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CN113154251A true CN113154251A (en) 2021-07-23

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