Industrial water treatment experience exchange air compressor circulating cooling water system stable operation plan discussion Yang Junqing Ancai high-tech power plant, Henan Anyang 455000 Abstract Xinyi period power workshop 090 air compressor operation after 4 months, there is scale on the inner wall of the cooler cooling water pipe The cooling effect is significantly reduced, which seriously affects the stable operation of the air compressor. In order to ensure the long-term stable operation of the air compressor, the author analyzed the cause of scaling and discussed the stable operation scheme of the air compressor cooling water system.
In the production of compressed air is mainly used for cylinder pneumatic valve venturi oxygen equipment air source gas delivery system drum agitation. Since the air releases a large amount of heat during the compression process, the air compressor is provided with a cooling water system for cooling the air compressor cylinder, which is called an air compressor circulating cooling water system.
The circulating cooling water is removed by the cooling tower cooling filter to remove the suspended matter. The circulating cooling water is partially lost during the cooling and discharging process, and the circulating cooling water system is balanced by adding soft water. Air compressor cycle cooling water system process 1.
Soft water replenishment water air compressor cooling water pool pump air compressor order but tower side filter pump. !
Filter I, sewage pipe network 1 air compressor cooling water system existed in the letter of the benefit period power plant integrated power station air compressor was put into operation on September 26, 2004, the circulating cooling water system was put into operation at the same time. During the operation of the air compressor, the cylinder temperature continues to rise. After 4 months of operation, the cylinder temperature is close to the upper temperature alarm value. When the alarm value is reached, the air compressor will automatically stop. In order to ensure the normal operation of the equipment, the air compressor shutdown inspection found that there are about 3, thick scale on the inner wall of the cylinder cooler cooling water pipe. Due to the low thermal conductivity of the scale, the cylinder temperature of the air compressor rises, which affects the long-term stable operation of the air compressor.
2 Analysis of the cause of scaling In order to thoroughly find the cause of scaling of the cooling water of the air compressor, the scale and the circulating cooling water were sampled and analyzed.
2.1 Cooler wall scale analysis Use a clean blade to sample the scale of the air cooler cooler wall and send it to the company research center for analysis by electron microscopy. The analysis result 6 is less. The scale is mainly calcium scale.
2.2 Air compressor circulating cooling water quality analysis Water sample from air compressor cooling water pool, water quality analysis project analysis results analysis method chemical analysis instrument analysis of suspended matter mgL, instrumental analysis can be seen from 1 although cycle cooling The water system uses a soft water hardness of 0. However, since the circulating water system uses an open cooling tower, the dust in the atmosphere enters the circulating water system, so the long-term accumulation causes the circulating water to have a constant hardness. 2 The amount of 033 in circulating water is higher. 3 Because the circulating water cools the cylinder of the high-temperature air compressor, the amount contained in it is 32.4 due to the part of the circulating water, which is converted into 0332, and it is accumulated continuously, and only rises continuously. Therefore, it is about 8 soft air compressors like soft water. Circulating cooling water scaling analysis According to the analysis of scale composition and water quality physical and chemical indicators, it is preliminarily determined that scale may be 003 scale. According to the data, at 1825 ft, the scale of 3,0;=2.9,109. In the circulating water, the concentration of 32+ is 9.73,107. Therefore, the circulating water has a scaling tendency. Therefore, the main cause of fouling of the circulating cooling water of the air compressor is due to the high content of 2+0032 in the circulating water.
3 Solution The reason for the fouling of the circulating cooling water of the air compressor can be inferred that reducing the amount of 032+ in the circulating water can effectively prevent the circulating cooling water from scaling. Therefore, the following anti-scaling measures were taken.
Reduce the 0 content of circulating water to replenish soft water. In the circulating water, 32 mainly comes from the hydrolysis of 03, so it is necessary to fundamentally reduce the content of 103 in the soft water. The original soft water preparation process of the power workshop 1.
The original soft water preparation process of the user of the sodium ion exchange department of the tap water mechanical filter can only remove the hardness of the water and cannot reduce the 003 content in the soft water. In order to reduce the content of 103 in soft water, the soft water preparation process was reformed, and the process flow after the transformation was 2.
+ Sodium ion exchanger tap water mechanical filter pipe mixer degassing tower! The water-making process of the hydrogen ion exchanger I user + water chestnut soft water tank not only can remove the hardness in the water, but also can reduce the content of 03 in the soft water.
By appropriately increasing the amount of sewage discharged from the circulating cooling water system of the air compressor, and simultaneously supplementing the same amount of soft water, partial replacement of the water body is achieved, thereby reducing the content of 0032 in the circulating water.
4 Effects The above measures were fully implemented on April 20, 2005.
After 12 months of operation observation, the air compressor did not rise again. In May 2006, the cylinder of the air compressor was disassembled, no scaling phenomenon was found, and the scaling of the circulating cooling water system was completely solved.
5 Conclusions The use of a closed cooling tower can effectively prevent the accumulation of 2+ in the circulating water, which is beneficial to prevent fouling of the circulating cooling water system, but the original, open cooling tower needs to be replaced.
Only the system sewage disposal method can effectively prevent the circulating water from scaling, but the larger the amount of sewage is required, and the waste is more serious, so the system sewage is often used in combination with other solutions.
For the northern region with high content of 03 in tap water, the sodium-hydrogen parallel process can reduce the content of 103 in soft water.
Reducing the content of 03 in the circulating water replenishing soft water can fundamentally reduce the content of 2 in the circulating water, thereby preventing fouling of the circulating cooling water system.
Beijing China Building Industry Press, 1986310352.
Tang received printing, Dai Youzhi, Jing Guohua, and so on. Industrial circulating cooling water treatment of the river. Beijing Chemical Industry Press, 20034468.
Central China Normal University, Northeast Normal University, Shaanxi Normal University. Analytical Chemistry River. Version 2. Beijing Higher Education Press, 1986616618.
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