Salt inhibitor as well as preparation method and application thereof

Abstract

The invention discloses a salt inhibitor as well as a preparation method and application thereof. The salt inhibitor is prepared from polyacrylic acid, sodium polyacrylate, a maleic acid-acrylic acidcopolymer, polyepoxysuccinic acid and hydrolyzed polymaleic anhydride in a volume ratio of (20-50):(30-40):(20-25):(10-20):(10-20). The salt inhibitor is prepared by stirring and mixing the componentsaccording to the volume ratio in a normal-pressure reaction kettle. The salt inhibitor can change the salt crystallization process in a solution and the adhesive force on the surfaces of salt particles to the maximum extent, the number of crystal nucleuses is greatly increased and the salt crystallized particles become fine; meanwhile, the binding force between the salt particles becomes extremely weak, the salt particles are not prone to being gathered into large particles, and therefore formation of large salt blocks is restrained, stopped or reduced. The salt inhibitor can be used for treating salt-containing wastewater of a hazardous waste incineration system, formation of salt blocks in the salt-containing wastewater can be inhibited, and the operation period of a quenching water tower of the hazardous waste incineration system is prolonged.

Description

technical field [0001] The invention relates to the technical field of hazardous waste incineration treatment technology, in particular to a salt inhibitor used in a hazardous waste incineration system to inhibit the formation of salt lumps in saline wastewater. The invention also relates to a preparation method and application of the salt inhibitor. Background technique [0002] At present, hazardous waste incineration systems usually include rotary kiln, secondary combustion chamber, waste heat boiler, quenching water tower, bag filter, alkali washing tower and flue gas heater. The process flow for flue gas treatment is: flue gas passes through rotary kiln → secondary combustion Room → waste heat boiler → rapid cooling water tower → bag filter → alkali washing tower → flue gas heater, and finally discharge. In the alkali washing tower, sodium hydroxide solution is generally used to wash the acid gases (hydrogen chloride, sulfur dioxide, hydrogen fluoride, etc.) in the flue...

AI Technical Summary

Problems solved by technology

Use evaporation crystallizer to evaporate, but it is easy to cause salt accumulation in the evaporation crystallizer to block, and the evaporated salt is also hazardous waste, which needs to be disposed of

Use the quenching water tower to spray to cool down, but it is easy to block the nozzle, and a large block of salt will be formed in the quenching water tower, blocking the flue gas channel

[0004] At present, most hazardous waste disposal manufacturers discharge the salty wastewater from the existing alkali washing tower to the sewage system for disposal, and use it as reclaimed water after treatment through three-effect multi-stage evaporators, MVR evaporators, MBR (membrane bioreactors) and biochemical devices. Reuse or up-to-standard discharge, the generated distillation residue is solidified and landfilled, the cost of wastewater treatment is high, and the waste salt generated takes up valuable landfill resources

[0005] Some hazardous waste enterprises spray back the salty wastewater into the quenching water tower, but because they did not adjust the corresponding equipment and operating parameters well, the rapid salt and coking in the quenching water tower resulted, and the quenching water tower had to be shut down for cleaning, reducing the The operation cycle of the quenching water tower seriously affects the profit of the enterprise

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