Zero-emission filling device for cryogenic liquid tank car and filling method of zero-emission filling device

Abstract

A zero-emission filling device for a cryogenic liquid tank car mainly comprises a common heat insulation cryogenic liquid storage vat, a cryogenic liquid pump and a cryogenic valve, wherein the outlet of the cryogenic liquid pump is connected with the tank car by an adapter pipe and the cryogenic valve, and the inlet of the cryogenic liquid pump is connected with the storage vat by a liquid inlet connecting pipe; and a return pipe with a backflow cryogenic globe valve is connected in series with the adapter pipe and also connected with the storage vat. A filling method comprises the following steps: (a) pre-cooling the cryogenic liquid pump: the backflow cryogenic globe valve is fully opened, a liquid inlet valve is gradually opened wide, at the moment, the cryogenic liquid pump starts to be pre-cooled, after pre-cooling is conducted for a period of time, an outlet blow through valve is slightly opened, and when continuous liquid is sprayed out from the outlet of the outlet blow through valve, the cryogenic liquid pump is quite cold; (c) starting up the cryogenic liquid pump, and after pressure rise, controlling the outlet pressure of the cryogenic liquid pump to be 2-3 bar higher than the pressure of the storage vat; (d) opening a tank car liquid inlet valve step by step, at the same time, turning down the backflow cryogenic globe valve, and controlling after pressure of the cryogenic liquid pump till the backflow cryogenic globe valve is fully closed; and (e) after finish of filling, stopping pumping.

Description

technical field [0001] The invention relates to a zero-emission filling device and filling method for a low-temperature liquid tank car, which is suitable for the case where the residual pressure in the tank car is relatively high after going to the user for unloading and returning to the liquid production factory, and belongs to the low-temperature liquid tank car filling device. technology field. Background technique [0002] The production of cryogenic liquids consumes a large amount of raw materials and electric energy, and the cost is very high; therefore, reducing the discharge during storage and filling of cryogenic liquids can significantly reduce the sales and transportation costs of cryogenic liquids; [0003] The liquid produced by the cryogenic liquid manufacturer enters the ordinary adiabatic cryogenic liquid storage tank for storage. After being pressurized by the cryogenic liquid pump, the liquid is filled into the tank car, and the tank car is driven to the u...

AI Technical Summary

Problems solved by technology

[0004] The traditional filling process is to discharge the medium-pressure gas in the tank car to reduce the pressure of the tank car as much as possible, and then the liquid in the liquid storage tank flows through the cryogenic liquid pump and then enters the tank car. At this time, the cryogenic liquid pump is also pre-cooled. Start the cryogenic liquid pump to quickly fill the tank car after cooling completely, and then close the tank car vent valve; this filling process will cause a large amount of residual low-temperature gas in the tank car to be discharged, which is extremely wasteful and will lead to liquid sales and transportation costs Increase

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