CN101874949A - Back-washing regeneration method of ceramic membrane method brine refining process filter - Google Patents

Abstract

The invention relates to the technical field of chlor-alkali chemical industry production, in particular to a back-washing regeneration method of a ceramic membrane method brine refining process filter; the ceramic membrane method primary brine filtering refining process is a novel refined brine filtering production process in chlor-alkali industry brine refining process at home and abroad; at present, the process has the disadvantages of high back-washing frequency and unclean silt removal, and a primary filtering side membrane pipe is easy to block by bridging brine sludge in crude brine and fiber matters, so as to cause the primary filtering pressure to be raised to above 0.5MPa, stopping is needed to carry out regeneration cleaning, and the normal production is affected. In the invention, crude brine is adopted and flows backwards from two grades to one grade, and back-washing is carried out for a plurality of times forcibly at the refined brine side, one-grade filtering pressure of the filter can be reduced below 0.3MPa, normal production is restored, and the production running time can be increased.

Description

The backwash renovation process of method of ceramic membrane brine refining process filter

Technical field

The present invention relates to chemical industry for making chlorine and alkali salt refining technical field, a kind of specifically backwash renovation process of method of ceramic membrane brine refining process filter.

Background technology

Method of ceramic membrane primary brine process for refining is that a kind of novel refined brine filters production technology in the domestic and international chlor-alkali industry brine rectification process.This technology is short with its technological process, and equipment is few, occupations of land is few, reduced investment, advantage and characteristics chlor-alkali industry primary brine refining aspect popularization at home such as operating cost is low, the assistant chemical refining agent consumption amount is few.Adopt at present that sea salt is that the tame chlor-alkali of raw material five enterprise exists in various degree all in the production run process that recoil frequency height, desilt are clean, one-level filters the side form pipe and put up a bridge by the salt slurry in the crude brine and fibrous material easily and stop up, cause the one-level filter pressure up to more than the 0.5MPa, because pressure reduction is little, recoil was lost efficacy, and (pressure 0.45-0.5MPa recoils; One-level service pressure 0.35-0.4MPa) filter flux decay, the phenomenon that the regeneration of having to stop is cleaned.Short being generally 7-10 days of regeneration cleaning frequency, production run efficient is low, influences the performance of ceramic membrane high flux production capacity, has had a strong impact on ordinary production.

Summary of the invention

The purpose of this invention is to provide a kind of backwash renovation process of method of ceramic membrane brine refining process filter, can stop, fast quick-recovery filter flux prolongs the ceramic membrane brine filter production run time.

The concrete steps of technical solution of the present invention are as follows:

A, when filter one-level side filter pressure is increased to 0.45MPa, close the refined brine flowing water Valve, isolate defective salt solution and enter the refined brine system, stop filtration cycle pump running, reducing one-level, to go into membrana oralis pipe end surface pressure be 0.15-0.2MPa.

B, open filter one-level side blowdown bottom valve and defective salt solution return valve, open the one-level feed pump, crude brine is flowed to one-level by secondary in the other direction with pressure 0.2-0.28MPa, flow velocity is 0.7m/s, form salt solution back flush pressure reduction 0.12-0.15MPa, the salt slurry caking of film inside pipe wall and end face is separated by the sewage draining exit discharge filter with impurity.

C, when crude brine reverse flow after 10 minutes, select the manual operation in the automatic control system, implement the refined brine side and force recoil, crossflow velocity 1.4m/s, 1-3 time, each 10 seconds.

D, after crude brine reverse flow operation 20 minutes, start crude brine filtration cycle pump, open the bypass circuit valve, close one-level side blowdown bottom valve, stop the running of one-level feed pump, observe filter one-level side filter pressure, as below 0.35MPa, sample analysis result after 5 minutes circulates, close the bypass circuit valve after qualified, open the refined brine flowing water Valve, welding system recovers to run well.

Technical scheme of the present invention is the high pressure cross-flow operation principle that is adopted at the ceramic membrane salt refining filter that at present is raw material with sea salt, one-level brine filter side crude brine inlet end face occurs and forms salt slurry in the crude brine and fibrous impurity obstruction and because the not good situation of the little repercussion effect of pressure reduction to the ceramic-film tube passage easily because circulating pump is provided at the pressure effect of filter one-level side.Take in the recoil process, to reduce one-level inlet pressure 0.15-0.2MPa, the measure that circulating brine is flowed to one-level in the other direction by secondary, utilize salt solution back flush pressure reduction to wash away and the effect of the gravity of caking own separates the salt slurry caking and the impurity of film inside pipe wall and end face, and pass through the sewage draining exit discharge filter.Cleaning regularly will reduce the film tube passage by the potential probability of salt slurry in the crude brine and fibrous impurity bridging obstruction, can make filter keep the high flux running status for a long time, prolong the regeneration cleaning frequency, realize continuous large-scale industrial production.

Advantage of the present invention is effectively to have solved the ceramic membrane filter device to filter the decay of side form pipe plug plug flux owing to contained a large amount of impurity in the sea salt cause one-level in the salt refining filtration process units that is raw material with sea salt, can not bring into play the problem of ceramic membrane high flux advantage continuously.Package unit does not stop, do not consume chemicals, do not increase energy consumption, backwash 10-30 minute one-level filter pressure just can remain on below the 0.35MPa for a long time weekly, keep higher filtration flux, the regeneration cleaning frequency extended to more than 30 days by 10 days, can additionally increase by 36 hours production run time in every month, can prolong every year about 400 hours filter production run time, save about 15 cubes high purity hydrochloric acid cleaning agent.

Description of drawings

Fig. 1 is a schematic diagram of the present invention

The specific embodiment

When salt slurry and fibrous impurity formation ceramic-film tube bridging obstruction initial stage, should implement backwash regeneration, concrete steps are as follows:

A, when filter one-level side filter pressure is increased to 0.45MPa, close the refined brine flowing water Valve, isolate defective salt solution and enter the refined brine system, stop filtration cycle pump running, reducing one-level, to go into membrana oralis pipe end surface pressure be 0.15-0.2MPa.

B, open filter one-level side blowdown bottom valve and defective salt solution return valve, open the one-level feed pump, crude brine is flowed to one-level by secondary in the other direction with pressure 0.2-0.28MPa, flow velocity is 0.7m/s, form salt solution back flush pressure reduction 0.12-0.15MPa, the salt slurry caking of film inside pipe wall and end face is separated by the sewage draining exit discharge filter with impurity.

C, when crude brine reverse flow after 10 minutes, select the manual operation in the automatic control system, implement the refined brine side and force recoil, crossflow velocity 1.4m/s, 1-3 time, each 10 seconds; The recoil number of times can be according to the fouling situation decision of film pipe crude brine vias inner walls.

D, after crude brine reverse flow operation 20 minutes, start crude brine filtration cycle pump, open the bypass circuit valve, close one-level side blowdown bottom valve, stop the running of one-level feed pump, observe filter one-level side filter pressure, as below 0.35MPa, sample analysis result after 5 minutes circulates, close the bypass circuit valve after qualified, open the refined brine flowing water Valve, welding system recovers to run well.

Claims (1)

1. the backwash renovation process of a method of ceramic membrane brine refining process filter is characterized in that concrete step is as follows:

A, when filter one-level side filter pressure is increased to 0.45MPa, close the refined brine flowing water Valve, isolate defective salt solution and enter the refined brine system, stop filtration cycle pump running, reducing one-level, to go into membrana oralis pipe end surface pressure be 0.15-0.2MPa;

B, open filter one-level side blowdown bottom valve and defective salt solution return valve, open the one-level feed pump, crude brine is flowed to one-level by secondary in the other direction with pressure 0.2-0.28MPa, flow velocity is 0.7m/s, form salt solution back flush pressure reduction 0.12-0.15MPa, the salt slurry caking of film inside pipe wall and end face is separated by the sewage draining exit discharge filter with impurity;

C, when crude brine reverse flow after 10 minutes, select the manual operation in the automatic control system, implement the refined brine side and force recoil, crossflow velocity 1.4m/s, 1-3 time, each 10 seconds;

D, after crude brine reverse flow operation 20 minutes, start crude brine filtration cycle pump, open the bypass circuit valve, close one-level side blowdown bottom valve, stop the running of one-level feed pump, observe filter one-level side filter pressure, as below 0.35MPa, sample analysis result after 5 minutes circulates, close the bypass circuit valve after qualified, open the refined brine flowing water Valve, welding system recovers to run well.

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