A cleaning method for chemical raw material transportation pipeline

Abstract

A method for sweeping chemical raw material conveying pipelines comprises the steps that two parallel-connected nitrogen heaters are used for heating nitrogen through steam, one nitrogen heater is connected with nitrogen, the other nitrogen heater is connected with steam, and the temperature of the nitrogen is 80-90 DEG C; 10 minutes before chemical raw materials are conveyed, the hot nitrogen is connected to front portions of raw material pump heads respectively in two paths, the hot nitrogen in one path is used for sweeping the pipeline from the front portion of pumps to all raw material storage grooves, and the hot nitrogen in the other path is used for sweeping the pipeline from input pumps to all process terminals; within 10 minutes after the chemical raw materials are conveyed, the above steps are executed repeatedly. Compared with the prior art, the method has the advantages that the sweeping time of all auxiliary raw material pipelines is short, sweeping efficiency is high, the pipeline sweeping mode through the nitrogen heaters is practical in actual production, the sweeping effect can meet the technological design requirement, possibility of blocking and freezing of the pipelines is reduced, and labor intensity of operators is lowered.

Description

Technical field [0001] The invention relates to the technical fields of coking chemical industry and petrochemical industry, in particular to a method for cleaning a chemical raw material transportation pipeline. Background technique [0002] Various production auxiliary raw materials for each process in the coal gas purification operation area (such as the washing oil required for the crude benzene process, the sulfuric acid required for the ammonium sulfate saturator and the acid absorption tower, and the sodium hydroxide, potassium hydroxide and ammonia required for the desulfurization process (Need sodium hydroxide) will be continuously consumed in production and needs to be replenished from time to time. It needs to be transported to three processes from the oil depot area. The transport pipeline is more than 1,500 meters long and is intermittently transported. It is easy to block and freeze in winter. Steam transport pipelines are usually used. Sections are cleaned and clea...

AI Technical Summary

Problems solved by technology

[0002] Various production auxiliary raw materials for each process in the gas purification operation area (such as washing oil required for the crude benzene process, sulfuric acid required for the ammonium sulfate saturator and acid absorption tower for acid production, sodium hydroxide, potassium hydroxide required for the desulfurization process, and ammonia distillation Sodium hydroxide) will be continuously consumed in production and needs to be replenished from time to time. It needs to be transported from the oil depot area to three processes separately. The transmission pipeline is more than 1,500 meters long, and the transmission is intermittent. It is easy to block and freeze in winter. Usually, steam pipelines are used to separate It takes a lot of manpower and steam resources to clean up, which restricts normal production and operation in severe cases