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Chemical cleaning and pre-filming method of circulating water system

A circulating water system and chemical cleaning technology, applied in chemical instruments and methods, descaling and water softening, natural water treatment, etc., can solve problems that do not meet environmental protection requirements, and achieve strong damage, improved smoothness, and unbreakable Effect

Active Publication Date: 2018-02-09
SHANDONG TIANQING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding sodium hexametaphosphate in the later stage is huge phosphorus, which does not meet environmental protection requirements

Method used

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Embodiment Construction

[0049] The invention provides a chemical cleaning pre-membrane method for a circulating water system, comprising the following steps:

[0050] 1. Sterilization and slime stripping: the purpose is to remove the biological slime and oil sludge in the system, so that the active ingredients of the agent in the cleaning process can fully contact the surface of the equipment to ensure the cleaning effect. The control is as follows:

[0051] Under the condition of ensuring the water volume of the system, turn off the sewage discharge and water replenishment, and add non-oxidative bactericidal algaecide and slime stripping agent at a rate of 80-120ppm respectively. After running for 2 hours, check the turbidity every half hour. When the turbidity rises to the peak and then gradually falls back, start to replace the water according to the water quality.

[0052] 2. Pickling, rust and scale removal treatment: the purpose is to fully remove the rust and scale of the system equipment, an...

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Abstract

The invention discloses a chemical cleaning and pre-filming method of a circulating water system. The method comprises the steps as follows: (1) sterilization and slime stripping: pollution dischargeand water replenishing are shut down under the condition that the water quantity of the system is guaranteed, a non-oxide sterilization and alga removal agent and a slime stripping agent are added inan impact manner, the turbidity falls step by step after rising to the peak, and water is replaced optionally; (2) acid pickling, rust removal and scale removal treatment: pollution discharge and water replenishing are shut down under the condition that the water quantity of the system is guaranteed, acid and a corrosion and scale inhibition agent are added to control the pH to range from 5.5 to 6.5, when the concentration of iron ions tends to balance basically, acid pickling can be completed, and then water is replaced; (3) pre-filming treatment: pre-filming treatment is started after the turbidity of circulating water is lower than 10 NTU and rho (Fe<3+>) is lower than 1.0 mg / L. With the chemical cleaning and pre-filming method, eutrophication of surrounding water can be avoided when discharging after pre-filming is ended.

Description

technical field [0001] The invention belongs to the technical field of industrial circulating cooling water treatment, and in particular relates to an application method of a chemical cleaning prefilming agent for a circulating water system. Background technique [0002] During the operation of the circulating cooling water system, due to the following factors: ①The escape of carbon dioxide in the cooling water system, the solubility product effect of salts, the inverse temperature effect of calcium carbonate and calcium phosphate, and the low flow rate of water, form carbonic acid Calcium, calcium sulfate, magnesium hydroxide, calcium silicate and other hard scales; ② Iron oxides or hydroxides formed by metal corrosion; ③ Suspended solids (such as sediment , dust, debris, etc.); ④ when the cooling tower is washed, dust or bacteria in the air enter the cooling water system, forming sludge or dirt under certain conditions; ⑤ slime formed by the reproduction of microorganisms ...

Claims

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Application Information

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IPC IPC(8): C23C22/17C23G1/04C02F9/04C02F5/14C02F1/50C02F1/66C02F103/02
CPCC02F5/145C02F9/00C02F2103/023C02F2303/08C23C22/17C23G1/04
Inventor 王金明梁清雷张留成张雷王俊明郑萍苗吉宾张少尉
Owner SHANDONG TIANQING TECH DEV
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