Device and method for filling and unloading liquid ammonia

Abstract

The invention relates to a device and a method for filling and unloading liquid ammonia. The device comprises a liquid ammonia buffer storage tank, a liquid ammonia filling and unloading arm and a delivery pump, and is characterized in that the liquid ammonia buffer storage tank is connected with the delivery pump; the delivery pump is connected with a liquid phase main pipeline; an outlet of the delivery pump is further provided with a backflow pipeline; a backflow regulating valve is arranged on the backflow pipeline; the liquid phase main pipeline passes through a rapid cut-off valve, a flame arrester, a mass flowmeter, a regulating valve of the mass flowmeter, a manual ball valve and the liquid ammonia filling and unloading arm on a liquid ammonia pipeline in sequence; the mass flowmeter and the regulating valve of the mass flowmeter are connected with a filling and unloading quantitative control system; a tank car is further connected with a gas phase filling and unloading arm; the gas phase filling and unloading arm is connected with a gas phase main pipeline or a compressor via a pipeline provided with a pressure meter, a flame arrester and a pneumatic regulating valve in sequence; the gas phase filling and unloading arm is then connected with an ammonia buffer storage tank; and the liquid phase main pipeline is further connected with the gas phase main pipeline via a safety valve. The device and the method can be applied to the field of filling and unloading various easily liquified liquid such as liquid ammonia, dimethyl ether and natural gas.

Description

technical field [0001] The invention relates to the filling and unloading of easily liquefied fluids, in particular to a device and method for filling and unloading liquefied ammonia. Background technique [0002] Synthetic ammonia is one of the most produced inorganic compounds in the world and has a wide range of industrial uses. Due to the long distance between liquid ammonia production and application sites, the filling and unloading of liquid ammonia is one of the basic operating units in the production, application, sales and transportation of synthetic ammonia. Because ammonia is a colorless, toxic gas with a pungent smell , when it comes to the production operation of ammonia, safety management is particularly important. It is necessary to strictly prevent leakage, safety is the premise of production. [0003] At present, the method of filling and unloading liquid ammonia is usually based on one-way operation, the operation process is cumbersome, the application dev...

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Problems solved by technology

[0003]At present, the method of filling and unloading liquid ammonia is often based on one-way operation, and the operation process is cumbersome. The application device has simple functions, small scale, and complicated operation process. Safety monitoring is inefficient, and there is an urgent need for a multi-functional device and method that integrates liquid ammonia filling and unloading to effectively ensure the safety and efficiency of liquid ammonia filling and unloading.

[0004] In the Chinese patent database, the application documents related to liquid ammonia filling and unloading include ZL201320422784.8 "A Liquid Ammonia Loading and Unloading System", which is Ben Wengfu ( Group) Co., Ltd.'s utility model patent, it is useful for liquid ammonia loading and unloading, but it needs to be further upgraded to play a greater role

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