Pre-film cleaning treatment method of circulating water system

A technology of circulating water system and treatment method, which is applied in oxidation water/sewage treatment, metal material coating process, etc., to achieve the effects of reducing sewage discharge, reducing sewage treatment costs, and saving manpower and material resources

Active Publication Date: 2018-04-13
TIANJIN ZHENGDA SCI &TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the existing cleaning and pre-filming methods, the present invention provides a cleaning and pre-filming treatment method for the circulating water system. In this method, organic phosphine is used to replace sodium hexametaphosphate in the traditional pre-filming, so that no drainage is required after the peeling and cleaning stage. technology, can be directly transferred to the pre-film stage; waste water does not need to be discharged, which not only saves a lot of fresh water but also reduces the treatment cost of the sewage plant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Example 1, in May 2016, an oil refinery in Shandong kept 2000m of water 3 , circulation capacity 6000m 3 / h, the plant's fourth circulating water plant system was put into use in 2006, and the cleaning and pre-membrane work is carried out once a year. The plant uses groundwater as supplementary water, and its water quality is negative hard water, with calcium ions lower than 30mg / L (calculated as calcium carbonate) and alkalinity 400mg / L (calculated as calcium carbonate).

[0016] The pre-membrane cleaning process of the present invention: peeling and cleaning stage: without affecting production, open all valves and open the pump to the maximum flow rate. Maintain a certain liquid level and add 100kg of trichloroisocyanuric acid, while detecting the turbidity and iron ions in the water. After 4 hours of operation, 200kg of dodecyldimethylbenzyl ammonium chloride was added, and after 2 hours, the detected turbidity rose to 50mg / L and the iron ion was 3.8mg / L.

[0017]...

example 2

[0019] Example 2 In November 2015, a coking plant in Hebei kept 3000m of water 3 , circulation volume 8000m 3 / h, the equipment of the circulating water plant includes methanol, chemical products, thermal power, etc. The methanol system often leaks organic matter into the circulating water system, which leads to serious bacterial growth, so the cleaning of the pre-membrane is performed once a year. The alkalinity and hardness of the water quality are moderate, but the dust is relatively large due to the coal yard, which has a certain impact on the turbidity of the circulating water.

[0020] Stripping and cleaning stage: without affecting production, open all valves and pump to maximum flow rate.

[0021] Maintain a certain liquid level and add 300kg of oxidizing bactericide sodium hypochlorite to run, and detect the turbidity and iron ions in the water at the same time. After 6 hours of operation, 600kg of slime stripping agent dodecyl dimethyl benzyl ammonium chloride was...

example 3

[0024] Example 3 In August 2015, a coking plant in Shanxi kept 3000m of water 3 , circulation capacity 7000m 3 / h, the equipment of the circulating water plant includes chemical production, refrigeration, thermoelectricity, etc. The water quality is typical high-hard and high-alkali water. The coal yard has a lot of dust and is located in an area with severe water shortage. Therefore, the cleaning of the pre-membrane is carried out every two years.

[0025] Stripping and cleaning stage: without affecting production, open all valves and pump to maximum flow rate. Keep a certain liquid level and add 300kg of trichloroisocyanuric acid to run, and detect the turbidity, iron ion and calcium ion in the water at the same time. After 4 hours, 600kg of dodecylbenzyl ammonium chloride was added, and after 2 hours, the detected turbidity rose to 100mg / L, iron ions 2.5mg / L, and calcium ions 500mg / L.

[0026] After 6 hours, enter the rust removal and pre-film stage, add urotropine 300kg...

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PUM

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Abstract

The invention discloses a pre-film cleaning treatment method of a circulating water system. Organic phosphine is adopted to replace sodium hexametaphosphate as a pre-film agent for cleaning pre-films.The pre-film phase is not influenced by turbidity of water after cleaning and iron ions; the better pre-film effect can be achieved; and a replacement step after cleaning can be saved. Meanwhile, a lot of waste water generated by replacement is reduced; and fresh industrial water and the treatment cost caused by pollution discharge are saved.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment, and relates to an open-type circulating water system cleaning pre-membrane technology without blowdown. Background technique [0002] The pre-film agents in the traditional cleaning pre-film method are sodium hexametaphosphate and zinc sulfate heptahydrate. Their film-forming conditions are harsh, and the turbidity in water cannot exceed 10mg / L, and the iron ion cannot exceed 1.0mg / L. After the cleaning step, the turbidity and iron ions in the water are much higher than the pre-film requirements. The traditional method is to replace the cleaned water with fresh water until the above standards are reached. For large-scale circulating water plants, especially old equipment, the turbidity after thorough cleaning is as high as 500mg / L, and the iron ion is as high as 30mg / L, so a considerable amount of fresh water is required to replace the water to an ideal level. Due to vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/48C23G1/06C02F1/72
CPCC02F1/72C23C22/48C23G1/061C23G1/065
Inventor 刘静赵西往王冀生
Owner TIANJIN ZHENGDA SCI &TECH CO LTD
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