Abstract: The chemical supply water pollution, increased organic matter content, chemical pretreatment can not get rid of, it must increase the activated carbon filters remove organic matter, organic matter into the boiler so as not to endanger the safe operation of the boiler.

In natural water contains a variety of organic compounds, through the coagulation and filtration water treatment can remove some, but most of the organic matter will enter the follow-up equipment, if the follow-up device is ion exchange resin, the resin it will cause organic pollution; if follow-up treatment is fine filtration – membrane separation, it will cause early failure of precision filter, if the organic matter into the thermal system, it will decompose into low molecular weight organic acids, affecting the quality of water and steam boilers. Sometimes, in order to reduce the content of organic matter in the pretreatment of chlorination, and maintain a certain amount of residual chlorine. Follow-up treatment to prevent residual chlorine ion exchange resins and membranes harm must be considered to remove residual chlorine in water treatment to remove organic matter to be considered not only have to consider removing chlorine, activated carbon adsorption is an effective Methods. Activated carbon adsorption of organic substances and chlorine principle is to use activated carbon surface bodies of the physical and chemical adsorption, so as to achieve the purpose of removal.

1 need Of a thermal power plant to add water from the chemical reservoir, through an industrial river to connect to the plant. 30 years, little change in the quality of raw water quality, the chemical desalination system is running relatively stable. Starting from August 1998, the plant cooling water system to open by the DC-cooling cycle, after cooling, add water intake of the chemical and industrial cooling water intake are the same well, the chemical added by the industrial circulating water, the water often back effect of the higher concentration of circulating water rate seriously affected the safe operation of chemical desalination system; the last two years from the reservoir to the industrial plant built many factories along the river, often by their discharge of industrial waste water river pollution The high salt content and organic matter content of water is also seriously affected the safe operation of chemical desalination system. Although starting from May 2000 has been completely eliminated the impact of the industrial circulating water, but the industry along the river by pollution of the water treatment plant has not been reduced, on the contrary there is an increasing trend, Table 1 for the past two years, organic matter content in water chemistry Buchong Status:

Can see from Table 1, when the industry along the river by the impact of industrial emissions and waste water from the organic content of the filter out most often 6 to 7 times the original average also reached the original 4 ~ 5 times. If the chemical added long-term water quality does not improve, a lot of organic matter in raw water pretreatment process (that is inclined tube pool, no valve filter, mechanical filter) and can not be removed, then most of the organic matter will go directly to desalination systems, organic Once desalination system, which dissolved the negatively charged acid radical and strong basic anion resin ion exchange between, and the macromolecular organic matter stuck in the resin gel structure part of the many tangles, when the first performance for the resin exchange capacity rapidly decreased acid consumption increased (as in the November 1998 cycle of the plant bed system of yin and yang of water by the normal time of around 10 000 m3 down to about 2 300 m3, showing resin exchange capacity decreased greatly, contribute only about a quarter of the original, and because repeated regeneration, in the need to increase fees by about 30 million per pH). Accompanied by some of desalination system is running slowly with a load of organic matter was released, was brought to the water than salt water; and neutral organic and colloidal organic matter directly through the ion exchange resin and with access to water desalination. Once the organic matter into the boiler through the water after boiling in the boiler water temperature thermal decomposition occur, producing organic acids, as well as a small amount of hydrochloric acid and sulfuric acid. The pH value of acid to the water heater down (such as November 19, 1998, No. 3 furnace plant water pH values dropped to 7191), resulting in tube wall with partial acid corrosion, thereby undermining the surface of magnetic iron oxide protection tube membrane, causing furnace tube rupture (such as more than a year after the plant in January 2000 three consecutive 3 boiler tube, three pipe explosion that has been identified as hydrogen corrosion. which acidic boiler water is an important hydrogen corrosion reasons). At the same time the small amount of volatile acid vapor carried into the turbine itself, lead to internal corrosion (eg, June 3, 2000 partitions turbine aircraft overhaul discovered, leaves and steam rooms and other places have different cylinder corrosion). Visible, due to the presence of organic matter caused serious harm to the follow-up of equipment, the removal of organic matter is of particular importance.

2 rehabilitation programs By the above analysis, one is clean water for organic growing; the other hand, organic matter can not be removed in the chemical pretreatment equipment, then clean water for organisms will enter the boiler with water, organic matter under high temperature in the furnace After a series of reactions caused serious harm the safe operation of the boiler. Must be increased in the desalination system, a set of pre-activated carbon filter to remove water for organic compounds. Plant existing three mechanical filters, each rated output is 150t / h, in fact the normal replenishment of about boiler 100 t / h or so, if a mechanical filter to transform carbon filter, the remaining two two-machine Filters rated output is 300t / h, the plant can meet the needs of the chemical pretreatment. The plant filter system diagram is shown in Figure 1.

Reform program for the No. 3 machine will be transformed into activated carbon filter filters, and then two additional valves, reformed the system diagram shown in Figure 2. Little change before and after the system transformation, the operation is also very convenient.

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