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The main problems in the operation of circulating water

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The main problems in the operation of circulating water

Release date:2016-07-27 Author: Click:

 

Industrial circulating cooling water system in the process of operation, due to water evaporation and wind loss situation of the circulating water continuously enriched, which contains salt ions increase, exceed the standard, the pH value significantly, resulting in deterioration of water quality, and the circulating water temperature, pH value and nutrition is conducive to microbial growth, adequate cooling the tower of sunlight is the ideal place of algae growth. Fouling control and corrosion control, microbial control and so on, it is necessary to recycle water treatment.

The main problems in the operation of circulating water:

Scale: due to evaporation of the circulating water is constantly in the process of cooling water, the salt concentration increased, the solubility of some salts and precipitation over. Common calcium carbonate, calcium phosphate, magnesium silicate and other scales. The scale of the texture is dense, greatly reduce the efficiency of heat transfer, the heat transfer coefficient of the scale thickness of 0.6 mm will reduce 20%.

Dirt: dirt is mainly composed of organic matter, water and microbial secretions, sediment, dust and other dirt, soft texture, not only reduce the heat transfer efficiency but also causes underdeposit corrosion, shorten the service life of the equipment.

Corrosion: corrosion of equipment in the circulating water heat exchanger, mainly electrochemical corrosion, dirt and other factors cause equipment manufacturing defects, water sufficient oxygen and corrosive ions in water and microbial secretion of mucus produced by corrosion, the consequences are very serious, uncontrolled short time even if the heat exchanger, water pipeline equipment scrap.

Microbial slime: because the circulating water dissolved oxygen, suitable temperature and nutrient rich conditions, very suitable for the growth and reproduction of microorganisms, such as not timely control will rapidly lead to the deterioration of water quality, smelly and black, cooling tower mucilaginous deposition or blockage, cooling effect significantly, equipment corrosion. Therefore, the treatment of circulating water must control the reproduction of microorganisms.

Microbial hazards

Circulating cooling water microorganisms from two aspects. A cooling tower is necessary to introduce a large amount of air in the process of evaporation of water, microorganism with air into the cooling water, the two is the supplement of water cooling water system there will be more or less microorganisms, these microbes with added water into the cooling water system.

Algae in the sunlight, water and carbon dioxide, will the bicarbonate carbon origin of photosynthesis, absorb carbon nutrition and release oxygen, therefore, when the algae blooms, will increase the dissolved oxygen content in water, is conducive to oxygen depolarization, thus accelerating the corrosion process. In the circulating water system, a large number of microorganisms breeding, will make the circulation of water color black, foul odor, pollution of the environment. At the same time, a large number of mud will be formed to reduce the cooling efficiency of the cooling tower. Mud deposited in the heat exchanger, the heat transfer efficiency and reduce the head loss increases, the deposition will lead to serious underdeposit corrosion in the slime of the metal surface, it also cut off the effect of corrosion inhibitor on the metal, the medicine can not play inhibition effectiveness. In addition, the microbial slime will accelerate the corrosion of the scale, some bacteria in the process of metabolism, biological secretions will also directly to the metal corrosion. All of these problems can lead to long-term safe operation of circulating water system, affecting the production, resulting in serious economic losses. Therefore, harm and scale and corrosion microorganisms on the cooling water system is serious, and even can be said that compared the three microorganisms is the primary hazard control.

The trends of microorganisms in circulating water can be measured by the following chemical analysis items:

Chlorine chlorine disinfection should pay attention to the time and the amount of residual chlorine chlorine appears, because microbial propagation will be serious to the circulating water chlorine consumption greatly increased.

Ammonia circulating water generally do not contain ammonia, but because the process of medium leakage or inhalation of ammonia in the air will make the water containing ammonia, then can not be let down, in addition to the leak point actively looking for ammonia, but also pay attention to whether the water containing nitrite, ammonia content in water is best controlled under 10mg/l.

NO2- when the water containing ammonia and nitrite, is already in the water nitrite bacteria convert ammonia to nitrite, the circulating water system of chlorination will become very difficult, the chlorine consumption increased, residual chlorine is difficult to reach the target, the content of NO2- in water is the best control in less than 1mg/l.

COD of microorganisms can be so severe that the increase of COD, because the bacteria secrete mucus increased the content of organic matter in water, therefore, through the analysis of the chemical oxygen demand, trends can be observed changes of microorganisms in water, under normal circumstances, the best water is less than 5mg/l COD.

The harm caused by the microorganism in circulating water is very serious, if you want to take measures after the microbial hazard is often shibeigongban also spend a lot of money and biocide. Therefore, it is necessary to make a comprehensive monitoring of circulating cooling water,

Concentration of water

The concentration ratio of the circulating water refers to water circulation system in the process of operation, due to water evaporation and wind loss situation of the circulating water continuously concentrated rate, it is an important measure of water quality control. Low concentration, water consumption, emissions are large and the efficiency of water treatment chemicals can not be brought into full play; high concentration multiple can reduce water treatment cost, saving water; but the concentration is too high, the scaling tendency of water will increase, control of scaling and corrosion control difficulty increases, agents will fail to water treatment, is not conducive to microbial control, the circulating water

 


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