Cleaning method for ultrafiltration system of garbage power plant

An ultrafiltration system, technology for power plants, applied in chemical instruments and methods, special treatment targets, water/sewage treatment, etc. Cleaning effect, improve water output, avoid frequent chemical cleaning effects

Pending Publication Date: 2022-03-11
广州环投设计研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After a long period of operation, the super pretreatment device will have problems such as scaling, fouling, and freq

Method used

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  • Cleaning method for ultrafiltration system of garbage power plant

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Embodiment Construction

[0042] When the water flow rate of the ultrafiltration device drops ≥ 20% or the transmembrane pressure difference ≥ 0.10MPa, the ultrafiltration device of the waste-to-energy plant should be cleaned. The specific cleaning process is as follows:

[0043] (1) Compressed air purging

[0044] 1. The DCS of the ultrafiltration system is in the maintenance state, and all valves are switched to the stop (manual) position;

[0045] 2. After confirming that the pressure of the compressed air tank 14 is normal, open the compressed air purge pneumatic valve 15, purge the ultrafiltration membrane for 5 minutes, and then close the compressed air purge pneumatic valve;

[0046] (2) Backwash

[0047] 1. Inject 2 / 3 of the liquid level of reverse osmosis product water into the ultrafiltration water tank 7, add 70kg of citric acid, and add chemically pure hydrochloric acid to adjust the pH value of the liquid medicine in the ultrafiltration water tank 7 to 1-2;

[0048] 2. Open the ultrafil...

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/44
CPCC02F1/444C02F2303/14C02F2303/16
Inventor 罗重奎盛鹏飞熊启明吴亮邹聪杜俊詹欣花袁洁珊
Owner 广州环投设计研究院有限公司
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