Technique for cleaning acid dirty of acid reactivating machine group inner loop type pipeline

Abstract

A cleaning process for acid stain in the circulating pipe for an acid regeneration unit is provided, which pertains to the technical field of auxiliary equipment for steel rolling, is for solving the issue of high-efficiency washing for the acid stain in the pipe for an acid regeneration unit, and is characterized in that, the process takes use of the equipment of the acid regeneration unit and an added T joint to connect rubber pipes and form two parallelly connected alkali-liquor flushing and circulating circuits, takes the bottom of a pre-thickener of the acid regeneration unit as a bath for an alkali liquor, uses an negative-pressure blower of the acid regeneration unit to provide power for the flowing of the furnace gas, bakes the pre-heating gas at the furnace top by the acid regeneration unit, and the furnace gas exchanges heat with the alkali liquor. The advantages with the invention are: 1. that no external equipment is required to add, pipes and valves are not necessary to dismount, labor and materials are saved; 2. that high cleaning efficiency is achieved, 1 / 3 time in cleaning is saved comparing with former process; 3. that the acid stain can be thoroughly cleaned; the period between cleanings is prolonged for the pipes, which is 1.5 times as that before; 4. that as the acid stain is thoroughly cleaned, the fault in the feeding pump is evidently reduced, the service life is improved nearly 3 times.

Description

technical field [0001] The invention relates to a process for cleaning acid scales of pipelines of an acid regeneration unit in a pickling and galvanizing production line of a rolling mill, and belongs to the technical field of rolling auxiliary equipment. Background technique [0002] Pickling and galvanizing is an important production link in the cold-rolled strip production line. The acid regeneration unit is a supporting unit for the pickling production line of the original pickling and galvanizing plant. The process flow of the acid regeneration unit using the waste hydrochloric acid spray roasting regeneration process is shown in Figure 2 shown. During the production process, since the concentrated waste acid at 80°C is easy to form viscous acid scale on the inner wall of the pipeline, there will be acid scale blockage on the inner wall of the pipeline, resulting in an increase in the power of the feeding pump and a decrease in the flow rate, affecting the treatment ca...

AI Technical Summary

Problems solved by technology

Under normal production conditions, the acid pipeline needs to be cleaned three times in two months, and each cleaning will consume a lot of manpower and material resources

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