Method for negative-pressure unloading of sulfuric acid tank cars of train

Abstract

The invention discloses a method for the negative-pressure unloading of the sulfuric acid tank cars of a train. The method comprises the following unloading technological steps: (1) dragging one to aplurality of sections of sulfuric acid train tank cars on a negative-pressure acid unloading station, putting at a position corresponding to an unloading crane, fixing, then opening a manhole of eachtank car, inserting the unloading crane and fixing; (2) closing an outlet valve of a vacuum tank, starting a pump, opening an acid filling valve of the crane, filling acid into the acid unloading crane for exhausting; (3) after completing exhaustion, stopping filling the acid, opening an outlet of the vacuum tank to a pump tank acid valve and then beginning to unload the acid; and (4) after completing unloading, pulling out the unloading crane, recovering the manholes and handing up the empty cars. The invention has the effects or advantages of no requirement on assembling connection tubes andno consideration on the airtightness of the connection tubes. Because of negative-pressure unloading, the invention has very small risk on safety and environmental protection, high efficiency and easy operation, the unloading number of each batch can reach 15 cars and unloading positions can be properly increased according to requirements.

Description

technical field [0001] The invention relates to the technical field of railway transportation of hazardous chemicals, in particular to a negative pressure unloading method for train sulfuric acid tank cars. Background technique [0002] At present, domestic sulfuric acid unloading vehicles are all unloading under positive pressure. The unloading process is as follows: put the train acid tank car that has been aligned and fixed, and there are inlet and outlet holes and manholes on the tank car. Therefore, there are generally three ports installed on the cover. In addition to the safety valve port, there are also inlet and outlet pipes. The inlet port of the acid-resistant stop valve installed on the inlet pipe is connected to the outlet port of the air compressor, and the outlet port of the tanker is connected to the user's acid tank with an acid-resistant pipeline. , Turn on the air compressor to compress the air into the tank car, and the compressed air will press the sulfu...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of compressed air positive pressure unloading: difficult operation, high safety risk, and low efficiency. After research and testing, these problems are solved, mainly by adopting a reasonable design process route and making full use of the working surface. Strive to maximize the number of batches of unloading vehicles, especially the selection of negative pressure unloading technology to achieve the purpose of safe production and efficient work efficiency

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