Automatic control sledge capable of quickly defrosting

Abstract

The utility model discloses an automatic control sledge capable of defrosting quickly, which comprises a plurality of air temperature type gasifiers, a recuperator, a gas return pipe, a plurality of liquid inlet control valves and a plurality of defrosting gas inlet control valves, and an inlet of each air temperature type gasifier is communicated with a liquefied natural gas source through a liquid inlet pipe. An outlet of each air temperature type gasifier is communicated with a gas outlet pipe; an inlet of the recuperator communicates with all the air outlet pipes, and an outlet of the recuperator communicates with an air supply pipe. The air return pipe is connected to the air supply pipe in a bypass mode, the other end of the air return pipe communicates with an inlet of each air temperature type vaporizer through a plurality of defrosting pipes, and the defrosting pipes are used for defrosting the air temperature type vaporizers. The liquid inlet control valves are in one-to-one correspondence with the liquid inlet pipes and are arranged on the corresponding liquid inlet pipes; and the defrosting air inlet control valves are in one-to-one correspondence with the defrosting pipes and are arranged on the corresponding defrosting pipes. The problem that an air temperature type vaporizer is highly dependent on the environment temperature can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquefied natural gas processing technical field, concretely relates to a quick defrosting automatic control skid. BACKGROUND

[0002] The main component of liquefied natural gas is methane, and its combustion product is carbon dioxide and water, so it is recognized as a clean fuel, and with the wide application of liquefied natural gas in various industries, new requirements are put forward for the construction of liquefied natural gas gasification station.

[0003] As one of the important equipment of liquefied natural gas gasification station, air temperature type gasifier is widely used in liquefied natural gas, liquid oxygen, liquid nitrogen and other industries due to its good heat transfer effect and energy saving advantage. However, the surface of air temperature type gasifier will be condensed into frost by water vapor in the air after 6-8 hours of use, resulting in gradual decline of heat transfer effect, and even possible damage to the rear-end equipment caused by direct passing of low-temperature liquid through the gasifier.

[0004] At present, the conventional method is to use environmental heat to gradually melt the frost on the surface of the gasifier. However, this defrosting method has high dependence on environmental temperature, and when the environmental temperature is lower than 0 DEG C and the humidity is large, the defrosting cannot be effectively realized, and the defrosting process is slow and requires a long time. Therefore, there is an urgent need to develop a quick defrosting automatic control system to solve the problem of high dependence of air temperature type gasifier on environmental temperature. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a quick defrosting automatic control skid, which can solve the problem of high dependence of air temperature type gasifier on environmental temperature.

[0006] The utility model is realized by the following technical scheme:

[0007] A quick defrosting automatic control skid, comprising a plurality of air temperature type gasifiers, the inlet of each air temperature type gasifier is communicated with a liquefied natural gas source through a liquid inlet pipe, and the outlet of each air temperature type gasifier is communicated with a gas outlet pipe; a reheater, the inlet of the reheater is communicated with all the gas outlet pipes, and the outlet of the reheater is communicated with a gas supply pipe; a gas return pipe, the gas return pipe is connected to the gas supply pipe, and the other end of the gas return pipe is communicated with the inlet of each air temperature type gasifier through a plurality of defrosting pipes, and the defrosting pipes are used for defrosting the air temperature type gasifier; a plurality of liquid inlet control valves, the liquid inlet control valves correspond to the liquid inlet pipes one by one and are arranged in the corresponding liquid inlet pipes; a plurality of defrosting gas inlet control valves, the defrosting gas inlet control valves correspond to the defrosting pipes one by one and are arranged in the corresponding defrosting pipes.

[0008] Optionally, the tail end of the defrosting pipe is in communication with the tail end of the corresponding liquid inlet pipe of the corresponding air-temperature vaporizer, and the communication is located between the inlet of the corresponding air-temperature vaporizer and the corresponding liquid inlet control valve.

[0009] Optionally, the gas supply pipe is provided with an exhaust temperature monitor.

[0010] Optionally, the gas supply pipe is provided with a defrosting switching control valve, and the bypass of the gas return pipe is located between the outlet of the reheater and the defrosting switching control valve.

[0011] Optionally, the tail ends of all the gas outlet pipes are in common communication with a detection pipe, the tail end of the detection pipe is in communication with the inlet of the reheater, and the detection pipe is provided with a temperature detector.

[0012] Optionally, the gas outlet pipe is bypassed by a direct supply pipe, the tail end of the direct supply pipe is in communication with the tail end of the gas supply pipe, and the communication of the tail end of the direct supply pipe is located between the tail end of the gas supply pipe and the defrosting switching control valve.

[0013] Optionally, the communication of the tail end of the direct supply pipe is located between the exhaust temperature monitor and the defrosting switching control valve.

[0014] Optionally, the direct supply pipe is provided with an inlet switching control valve.

[0015] Optionally, the gas outlet pipe is provided with a reheating inlet control valve, and the reheating inlet control valve is located between the head end of the corresponding direct supply pipe and the head end of the detection pipe.

[0016] Optionally, the number of air-temperature vaporizers is two.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model provides an automatic control skid of quick defrosting, through setting up multiple air temperature type gasifiers, realize the possibility of switching use, the air temperature type gasifier of defrosting of frost of air temperature type gasifier defrosting continues to work simultaneously, will not influence gasification efficiency, on this basis, through setting up reheater and back gas pipe, the first end of setting back gas pipe and reheater's export intercommunication, the tail end passes through multiple defrosting pipes and is communicated with every air temperature type gasifier's import respectively, the gaseous natural gas of air temperature type gasifier discharge reheats and goes into the air temperature type gasifier of frost, from inside air temperature type gasifier heating, to solve its defrosting dependence environmental temperature's problem, on this basis, through setting up multiple liquid inlet control valve and multiple defrosting gas inlet control valve, utilize liquid inlet control valve and cut off the liquefied natural gas source of air temperature type gasifier of frost, to avoid its further frost, through defrosting gas inlet control valve control defrosting pipe and go into the corresponding air temperature type gasifier of frost after the natural gas of reheating, through the mutual cooperation of above each feature, effectively solve the problem of air temperature type gasifier's dependence on environmental temperature. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0020] Figure 1 The schematic diagram of the automatic control skid of quick defrosting provided by the embodiments of the present application.

[0021] Markings in the drawings and corresponding component names:

[0022] 10-air temperature type gasifier;20-liquid inlet pipe;21-gas outlet pipe;22-detection pipe;23-temperature detector;24-direct supply pipe;25-gas inlet switching control valve;26-reheat gas inlet control valve;30-reheater;31-gas supply pipe;311-exhaust temperature monitor;32-defrosting switching control valve;40-back gas pipe;41-defrosting pipe;50-liquid inlet control valve;51-defrosting gas inlet control valve. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with examples and drawings, the schematic embodiment of the present application and its description are only used to explain the present application, and not as the limitation of the present application.

[0024] EMBODIMENT

[0025] Please refer to Figure 1The embodiment provides an automatic control skid for quick defrosting, which comprises a plurality of air-temperature type gasifiers 10, the inlet of each air-temperature type gasifier 10 is communicated with a liquefied natural gas source through a liquid inlet pipe 20 respectively, and the outlet of each air-temperature type gasifier 10 is communicated with a gas outlet pipe 21 respectively; a second comprises a reheater 30, the inlet of the reheater 30 is communicated with all the gas outlet pipes 21, and the outlet of the reheater 30 is communicated with a gas supply pipe 31; a third comprises a gas return pipe 40, the gas return pipe 40 is connected to the gas supply pipe 31 in parallel, and the other end of the gas return pipe 40 is communicated with the inlet of each air-temperature type gasifier 10 through a plurality of defrosting pipes 41 respectively, and the defrosting pipes 41 are used for defrosting the air-temperature type gasifier 10; a fourth comprises a plurality of liquid inlet control valves 50, the liquid inlet control valves 50 correspond to the liquid inlet pipes 20 one by one and are arranged on the corresponding liquid inlet pipes 20; and a fifth comprises a plurality of defrosting gas inlet control valves 51, the defrosting gas inlet control valves 51 correspond to the defrosting pipes 41 one by one and are arranged on the corresponding defrosting pipes 41.

[0026] The automatic control skid for quick defrosting is provided, a plurality of air-temperature type gasifiers 10 are arranged, so that switching use is possible, the air-temperature type gasifier 10 that has frost is defrosted, and the air-temperature type gasifier 10 that has no frost continues to work, so that the gasification efficiency is not affected; on the basis, the reheater 30 and the gas return pipe 40 are arranged, the first end of the gas return pipe 40 is communicated with the outlet of the reheater 30, the tail end is communicated with the inlets of the air-temperature type gasifiers 10 through the plurality of defrosting pipes 41 respectively, the gaseous natural gas discharged from the air-temperature type gasifier 10 is reheated and heated, and then is introduced into the air-temperature type gasifier 10 that has frost, so that the air-temperature type gasifier 10 is heated from the inside, frost is quickly defrosted, and the problem that defrosting depends on the environment temperature is solved; on the basis, the plurality of liquid inlet control valves 50 and the plurality of defrosting gas inlet control valves 51 are arranged, the liquid inlet control valve 50 is used to cut off the liquefied natural gas source of the air-temperature type gasifier that has frost, so that the air-temperature type gasifier that has frost is prevented from further frosting, and the defrosting gas inlet control valve 51 is used to control the defrosting pipe 41 to introduce the reheated natural gas into the corresponding air-temperature type gasifier 10 that has frost; through mutual cooperation of the above-mentioned features, the problem that the air-temperature type gasifier has high dependence on the environment temperature is effectively solved.

[0027] In order to optimize pipeline connection, better introduce the reheated gas into the air-temperature type gasifier 10, and flow along the liquefied natural gas path to defrost, the tail end of the defrosting pipe 41 that has frost is communicated with the tail end of the corresponding liquid inlet pipe 20 of the corresponding air-temperature type gasifier 10, and the communication position is located between the inlet of the corresponding air-temperature type gasifier 10 and the corresponding liquid inlet control valve 50.

[0028] In order to monitor whether the temperature of the reheated gas is sufficient for backflow defrosting, the gas supply pipe 31 is provided with an exhaust temperature monitor 311.

[0029] In order to ensure sufficient flow of the reheated gas to defrost the air-cooled gasifier 10, the air supply pipe 31 is provided with a defrosting switching control valve 32, and the air return pipe 40 is connected to the outlet of the reheater 30 and the defrosting switching control valve 32.

[0030] By providing the defrosting switching control valve 32, when the air-cooled gasifier 10 is frosted, the defrosting switching control valve 32 is closed to make the reheated gas return, and when the air-cooled gasifier 10 is not frosted, the defrosting switching control valve 32 is opened to make the reheated gas directly supply to the gas station.

[0031] In order to monitor the temperature of the gas entering the reheater 30 to determine the heat energy required by the reheater 30, the tail ends of all the air outlet pipes 21 are connected to a detection pipe 22, and the tail end of the detection pipe 22 is connected to the inlet of the reheater 30; the detection pipe 22 is provided with a temperature detector 23.

[0032] Since the gas after defrosting still has a high temperature, in order to avoid the reheater 30 from repeatedly heating the gas, the air outlet pipe 21 is connected to a direct supply pipe 24, and the tail end of the direct supply pipe 24 is connected to the tail end of the air supply pipe 31; the connection between the tail end of the direct supply pipe 24 and the tail end of the air supply pipe 31 is located between the defrosting switching control valve 32.

[0033] By providing the direct supply pipe 24, the gas after defrosting is directly introduced into the air supply pipe 31.

[0034] Preferably, the connection between the tail end of the direct supply pipe 24 and the tail end of the air supply pipe 31 is located between the exhaust temperature monitor 311 and the defrosting switching control valve 32.

[0035] Through the above arrangement, the temperature is monitored by the exhaust temperature monitor 311, and if the temperature is abnormal, timely response and treatment are performed.

[0036] In order to avoid the exhaust gas of the air-cooled gasifier 10 during normal use directly entering the air supply pipe 31 through the direct supply pipe 24, the direct supply pipe 24 is provided with an air inlet switching control valve 25.

[0037] In order to avoid the gas that should be discharged through the direct supply pipe 24 from entering the reheater, the air outlet pipe 21 is provided with a reheating air inlet control valve 26; the reheating air inlet control valve 26 is arranged between the head end of the corresponding direct supply pipe 24 and the head end of the detection pipe 22.

[0038] Preferably, the number of the air-cooled gasifiers 10 is two.

[0039] The above specific embodiments explain the purpose, technical scheme and beneficial effects of the present application in further detail, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic control skid for fast defrosting, characterized in that, The application relates to a liquefied natural gas vaporizer. The application comprises: a plurality of air-cooled vaporizers (10), the inlet of each air-cooled vaporizer (10) is communicated with a liquid inlet pipe (20) respectively, and the outlet of each air-cooled vaporizer (10) is communicated with a gas outlet pipe (21) respectively; a reheater (30), the inlet of the reheater (30) is communicated with all the gas outlet pipes (21), and the outlet of the reheater (30) is communicated with a gas supply pipe (31); a gas return pipe (40), the gas return pipe (40) is connected to the gas supply pipe (31), and the other end of the gas return pipe (40) is communicated with the inlet of each air-cooled vaporizer (10) through a plurality of defrosting pipes (41), and the defrosting pipes (41) are used for defrosting the air-cooled vaporizer (10); a plurality of liquid inlet control valves (50), the liquid inlet control valves (50) correspond to the liquid inlet pipes (20) one by one and are arranged on the corresponding liquid inlet pipes (20); 2. The automatic control sled for quick defrosting according to claim 1, characterized in that, a plurality of defrosting gas inlet control valves (51), the defrosting gas inlet control valves (51) correspond to the defrosting pipes (41) one by one and are arranged on the corresponding defrosting pipes (41).

3. The automatic control sled for quick defrosting according to claim 1, wherein The tail end of the defrosting pipe (41) is communicated with the tail end of the corresponding liquid inlet pipe (20) of the corresponding air-cooled vaporizer (10), and the communication position is between the inlet of the corresponding air-cooled vaporizer (10) and the corresponding liquid inlet control valve (50).

4. The automatic control sled for quick defrosting according to claim 3, characterized in that, The gas supply pipe (31) is provided with an exhaust temperature monitor (311).

5. The automatic control sled for quick defrosting according to claim 4, characterized in that, The gas supply pipe (31) is provided with a defrosting switching control valve (32), and the connection position of the gas return pipe (40) is between the outlet of the reheater (30) and the defrosting switching control valve (32). The tail ends of all the gas outlet pipes (21) are commonly communicated with a detection pipe (22), and the tail end of the detection pipe (22) is communicated with the inlet of the reheater (30); 6. The automatic control sled for quick defrosting according to claim 5, characterized in that, The detection pipe (22) is provided with a temperature detector (23). The gas outlet pipe (21) is connected to a direct supply pipe (24), and the tail end of the direct supply pipe (24) is communicated with the tail end of the gas supply pipe (31); 7. The automatic control sled for quick defrosting according to claim 6, characterized in that, The communication position of the tail end of the direct supply pipe (24) is between the tail end of the gas supply pipe (31) and the defrosting switching control valve (32).

8. The automatic control sled for quick defrosting according to claim 7, characterized in that, The communication position of the tail end of the direct supply pipe (24) is between the exhaust temperature monitor (311) and the defrosting switching control valve (32).

9. The automatic control sled for fast defrosting according to claim 8, characterized in that, The direct supply pipe (24) is provided with an inlet switching control valve (25). The gas outlet pipe (21) is provided with a reheating gas inlet control valve (26); 10. The automatic control sled for fast defrosting according to claim 1, characterized in that, The reheating gas inlet control valve (26) is arranged between the head end of the corresponding direct supply pipe (24) and the head end of the detection pipe (22). The number of the air-cooled vaporizers (10) is two.

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