CN-224229735-U - LNG fuel cabin and tail gas recovery system thereof

CN224229735UCN 224229735 UCN224229735 UCN 224229735UCN-224229735-U

Abstract

An LNG fuel tank and a tail gas recovery system thereof are provided, wherein the tail gas recovery system comprises a condensing mechanism, a nitrogen supply mechanism, a mixed gas recovery mechanism, a tail gas discharge mechanism and a natural gas storage mechanism, the output end of a liquid nitrogen supply device and the output end of the nitrogen supply device are respectively communicated with a nitrogen supply pipe, the number of condensers is multiple, the nitrogen supply pipe passes through the nitrogen residual cold recovery device after passing through the inside of the condensers, the output end of the mixed gas input pipe is respectively communicated with the input ends of the condensers through the mixed gas residual cold recovery device, the output end of the mixed gas output pipe is communicated with the tail gas discharge mechanism, and the input end of the natural gas storage mechanism is communicated with the output end of the condenser below. According to the scheme, the components to be recovered are fully recovered by utilizing nitrogen at different positions, the method of directly burning to maintain the low pressure of the fuel tank can be replaced, and the problem that the natural gas filled by the existing differential pressure method is mainly burnt to cause waste is solved.

Inventors

LUO XIAO
YANG GANG
LIU YUE
LIN GANG
DING GUANGHUA
XIONG WEIMING
Wu Qiaolei

Assignees

广东华南特种气体研究所有限公司
广东省特种设备检测研究院
江西省检验检测认证总院特种设备检验检测研究院

Dates

Publication Date: 20260512
Application Date: 20250530

Claims (9)

1. The tail gas recovery system of the LNG fuel tank is characterized by comprising a condensation mechanism, a nitrogen supply mechanism, a miscellaneous gas recovery mechanism, a tail gas emission mechanism and a natural gas storage mechanism; The condensing mechanism comprises a condenser; The nitrogen supply mechanism comprises a liquid nitrogen supply device, a nitrogen residual cold recovery device and a nitrogen supply pipe; The output end of the liquid nitrogen supply device and the output end of the nitrogen supply device are respectively communicated with the nitrogen supply pipes, the number of the condensers is multiple, and the nitrogen supply pipes pass through the nitrogen residual cold recovery device after passing through the interiors of the condensers; The miscellaneous gas recovery mechanism comprises a miscellaneous gas input pipe and a miscellaneous gas output pipe; The output ends of the impurity gas input pipes are respectively communicated with the input ends of the condensers through the nitrogen residual cold recovery device; the output end of the miscellaneous gas output pipe is communicated with the tail gas emission mechanism; the input end of the natural gas storage mechanism is communicated with the output end of the condenser below.
2. The LNG fuel tank tail gas recovery system according to claim 1, further comprising a PLC module; the PLC module is in communication connection with the miscellaneous gas recovery mechanism and the nitrogen supply mechanism; The impurity gas recycling mechanism also comprises an inlet gas component detection device and an inlet gas parameter detection device; The inlet gas component detection device and the inlet gas parameter detection device are respectively arranged on the impurity gas input pipe and are positioned between the input end of the impurity gas input pipe and the nitrogen residual cold recovery device.
3. The LNG tank tail gas recovery system according to claim 2, wherein the intake air parameter detecting means includes intake air flow rate detecting means, intake air temperature detecting means, and intake air pressure detecting means; the air inlet flow detection device, the air inlet temperature detection device and the air inlet pressure detection device are respectively arranged on the impurity gas input pipe and are positioned between the input end of the impurity gas input pipe and the nitrogen residual cold recovery device.
4. The LNG tank tail gas recovery system according to claim 3, wherein the tail gas discharging means comprises a tail gas pipe and a tail gas detecting device; The tail gas detection device comprises a tail gas component detection device, a tail gas flow detection device, a tail gas temperature detection device and a tail gas pressure detection device; the tail gas flow detection device, the tail gas temperature detection device and the tail gas pressure detection device are respectively arranged on the tail gas pipe, and the tail gas detection device is in communication connection with the PLC module.
5. The LNG tank tail gas recovery system according to claim 2, wherein the condensing means further comprises a transfer pipe and a transfer valve; the output end of one condenser is communicated with the input end of the other condenser through the transfer pipe, and the transfer valve is arranged on the transfer pipe.
6. The LNG tank tail gas recovery system according to claim 5, wherein the impurity gas recovery mechanism further comprises an impurity gas valve body mounted to the impurity gas input pipe, the impurity gas valve body being communicatively connected to the PLC module.
7. The LNG tank tail gas recovery system of claim 5, wherein the transfer valve is a solenoid valve, the transfer valve being communicatively coupled to the PLC module.
8. The tail gas recovery system of the LNG fuel tank according to any one of claims 1 to 7, wherein the liquid nitrogen supply device and the nitrogen supply device respectively comprise a nitrogen source container, a nitrogen outlet pipe and a control valve; The output end of the nitrogen source container is communicated with the input end of the nitrogen outlet pipe, the output end of the nitrogen outlet pipe is communicated with the input end of the nitrogen supply pipe, and the control valves are respectively arranged on the nitrogen outlet pipe.
9. An LNG fuel tank characterized in that an exhaust gas recovery system of an LNG fuel tank according to any one of claims 1-8 is provided.

Description

LNG fuel cabin and tail gas recovery system thereof Technical Field The utility model relates to the field of tail gas recovery, in particular to an LNG fuel tank and a tail gas recovery system thereof. Background The LNG fuel tank is filled by adopting a differential pressure method, LNG can naturally evaporate after entering the fuel tank, so that the pressure in the tank is increased to prevent filling, gaseous natural gas is required to be continuously reduced in the filling process to maintain the low pressure of the fuel tank, the pressure mode of the fuel tank is basically based on direct combustion treatment at present, but the treatment mode is excessively wasted, and because the first filling of a 2000m 3 fuel tank can discharge 20-40 tons of natural gas according to different filling technologies, the differential pressure method is convenient for filling the natural gas, high in cost and unfavorable for sustainable development. Disclosure of utility model The utility model aims to provide a tail gas recovery system of an LNG fuel tank, which can firstly utilize a nitrogen supply mechanism to convey nitrogen to a condenser and a nitrogen residual cold recovery device, then utilize a miscellaneous gas input pipe to firstly pass through the nitrogen residual cold recovery device and then convey the miscellaneous gas input pipe into the condenser, and fully utilize nitrogen at different positions to recover components to be recovered. The utility model also provides an LNG fuel tank, which uses the tail gas recovery system of the LNG fuel tank. To achieve the purpose, the utility model adopts the following technical scheme: An exhaust gas recovery system of an LNG fuel tank comprises a condensation mechanism, a nitrogen supply mechanism, a miscellaneous gas recovery mechanism, an exhaust gas emission mechanism and a natural gas storage mechanism; The condensing mechanism comprises a condenser; The nitrogen supply mechanism comprises a liquid nitrogen supply device, a nitrogen residual cold recovery device and a nitrogen supply pipe; The output end of the liquid nitrogen supply device and the output end of the nitrogen supply device are respectively communicated with the nitrogen supply pipes, the number of the condensers is multiple, and the nitrogen supply pipes pass through the nitrogen residual cold recovery device after passing through the interiors of the condensers; The miscellaneous gas recovery mechanism comprises a miscellaneous gas input pipe and a miscellaneous gas output pipe; The output ends of the impurity gas input pipes are respectively communicated with the input ends of the condensers through the nitrogen residual cold recovery device; the output end of the miscellaneous gas output pipe is communicated with the tail gas emission mechanism; the input end of the natural gas storage mechanism is communicated with the output end of the condenser below. Optimally, the system also comprises a PLC module; the PLC module is in communication connection with the miscellaneous gas recovery mechanism and the nitrogen supply mechanism; The impurity gas recycling mechanism also comprises an inlet gas component detection device and an inlet gas parameter detection device; The inlet gas component detection device and the inlet gas parameter detection device are respectively arranged on the impurity gas input pipe and are positioned between the input end of the impurity gas input pipe and the nitrogen residual cold recovery device. Optimally, the air inlet parameter detection device comprises an air inlet flow detection device, an air inlet temperature detection device and an air inlet pressure detection device; the air inlet flow detection device, the air inlet temperature detection device and the air inlet pressure detection device are respectively arranged on the impurity gas input pipe and are positioned between the input end of the impurity gas input pipe and the nitrogen residual cold recovery device. Optimally, the tail gas emission mechanism comprises a tail gas pipe and a tail gas detection device; The tail gas detection device comprises a tail gas component detection device, a tail gas flow detection device, a tail gas temperature detection device and a tail gas pressure detection device; the tail gas flow detection device, the tail gas temperature detection device and the tail gas pressure detection device are respectively arranged on the tail gas pipe, and the tail gas detection device is in communication connection with the PLC module. Optimally, the condensing mechanism also comprises a transfer pipe and a transfer valve; the output end of one condenser is communicated with the input end of the other condenser through the transfer pipe, and the transfer valve is arranged on the transfer pipe. Optimally, the miscellaneous gas recovery mechanism further comprises a miscellaneous gas valve body, wherein the miscellaneous gas valve body is arranged on the miscellaneous gas input pipe, and