An unloading method for liquid ammonia-transporting tank lorry

Abstract

The invention relates to a method for unloading the liquid ammonia tank car. Wherein, the gas interface and the liquid interface of tank car are connected to the gas and liquid interfaces of storage pot; first, using the gas compressor to adsorb gas from the storage and discharge gas to the tank car to make the liquid ammonia flow into the storage pot via liquid pipe; when the liquid ammonia can not flow, closing the liquid interface, and using gas compressor to adsorb gas from the tank car and discharge gas to the storage pot, therefore, the left liquid ammonia will be gasified to be discharged to the storage pot, until the pressure inside the tank car reaches 0.1MPa, stopping the gas compressor. The invention can avoid environment pollution and improve the economic benefits.

Description

technical field [0001] The invention relates to a method for discharging liquefied gas from a container, in particular to a method for unloading liquefied ammonia from a tank truck. Background technique [0002] At present, the commonly used scheme for unloading tank trucks loaded with liquefied ammonia at the destination is: there are two pipelines connected between the tank truck and the storage tank, one of which is a gas phase pipeline and the other is a gas phase pipeline. It is a liquid phase pipeline, and a liquid ammonia pump is connected to the liquid phase pipeline. Through the operation of the liquid ammonia pump, the liquid ammonia in the tanker enters the storage tank from the liquid phase pipeline. The above scheme has the following disadvantages: at the beginning of unloading, the liquid phase pipeline where the liquid ammonia pump is located must be emptied to ensure the normal operation of the liquid ammonia pump, and a small amount of liquid ammonia will be...

AI Technical Summary

Problems solved by technology

The above scheme has the following disadvantages: at the beginning of unloading, the liquid phase pipeline where the liquid ammonia pump is located must be emptied to ensure the normal operation of the liquid ammonia pump, and a small amount of liquid ammonia will be discharged to the outside when emptying environment, and when the gas phase pipeline and liquid phase pipeline of the outer section of the tanker are removed after the unloading is completed, the ammonia remaining in the two pipelines will also be discharged into the external environment, and ammonia discharge into the external environment will cause A certain amount of waste will pollute the environment and bring potential safety hazards (ammonia is flammable, explosive, and toxic); in addition, after the unloading is completed, there will still be a small amount of ammonia remaining in the tanker, and the unloading is not complete enough.

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