Cleaning method for ultrafiltration system of garbage power plant

Abstract

The invention relates to a cleaning method for an ultrafiltration system of a garbage power plant, which is applied to a circulating cooling water bypass desalting system of the garbage power plant. The method comprises compressed air purging: 1) an ultrafiltration system is in a maintenance state, and all valves are stopped; (2) opening a pneumatic valve, purging the ultrafiltration membrane for 5 minutes, and then closing the pneumatic valve; backwashing: (1) injecting reverse osmosis produced water at two thirds of the liquid level into the ultrafiltration water tank, adding 70kg of citric acid, and adding hydrochloric acid to enable the pH value to be 1-2; (2) opening an ultrafiltration exhaust valve and an ultrafiltration blow-down valve, and closing the ultrafiltration exhaust valve and the ultrafiltration blow-down valve; 3) opening a backwashing water inlet valve, a backwashing blow-down valve, a backwashing water pump and a backwashing water pump inlet valve, and closing other valves; 4) starting a backwashing water pump to enable the water outlet pressure to be 0.18-0.20 MPa, and washing for 1 hour; and (5) shutting down a backwashing water pump, draining the cleaning liquid in the ultrafiltration device, the ultrafiltration cleaning pipeline and the ultrafiltration water tank, and washing cleanly. The method has the advantages that the chemical cleaning effect is effectively improved, and the water output of reverse osmosis is improved.

Description

technical field [0001] The invention relates to a cleaning method of a super pretreatment system, in particular to a cleaning method applied to a circulating cooling water bypass desalination system of a garbage power plant. Background technique [0002] The water sources of the circulating water system of the waste-to-energy plant mainly include: 1) the purified river water; 2) the return water of the cooling water of the steam turbine condenser; 3) the return water of the auxiliary industrial cooling water; 4) the produced water of the leachate treatment system ; 5) unit drainage. The water source is complicated and has a high salt content. During operation, in order to reduce the salt content of the circulating cooling water, a bypass desalination system with a super pretreatment device is often used. [0003] After a long period of operation, the super pretreatment device will have problems such as scaling, fouling, and frequent chemical cleaning. , active silicon, TDS...

AI Technical Summary

Problems solved by technology

[0003] After a long period of operation, the super pretreatment device will have problems such as scaling, fouling, and frequent chemical cleaning. , active silicon, TDS and other indicators seriously deviate from the original design water quality

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