Exploration and Analysis of New Measures for Scale Removal of an Air Compressor

In the actual operation of the air compressor, the cooler often causes the copper pipe to be blocked due to the scale, resulting in an increase in the exhaust gas temperature, and the air compressor is shut down, which seriously affects the safe production. Therefore, the removal of the scale of the cooler is safe for the air compressor. Reliable operation is of great significance.

1 Causes of scale formation

The requirements for air quality of air compressor cooling water are as follows: water quality is neutral, that is, hydrogen ion concentration (pH) is 6.5 7. 5; suspended matter is not more than 25 mg / l; organic matter content is not more than 25 mg / l; temporary hardness is not more than 10 degrees; oil content is not more than 5 mg / l.

Therefore, the requirements for the air quality of the air compressor must be clean and free of impurities. The water quality is neutral. The dirty water, sewage and acidic water cannot be used. The quality of the water used in any cooling system is not constant during the operation of the system. Vaporization, corrosion, Chemical and temperature changes, ventilation, scale and microbial formation all affect the composition of water, especially for water with a temporary hardness. When the water temperature exceeds 40, the precipitation of salt in the water is intensified, and the cooling surface will cause fouling to reduce the flow rate. The heat transfer efficiency is reduced and the system is eventually damaged. Therefore, it is generally required that the cooling water supply temperature is not higher than 30 and the drainage temperature is not higher than 40. In individual hot climate areas or when the temporary hardness of water is low, the water supply and drainage temperature may be slightly higher (not more than 5).

2 scale removal method

It is ideal to form a thin layer of uniform calcium carbonate on the inner surface of the cooler, which acts as a corrosion protection, and usually the scale thickness is not allowed to exceed 2 mm, but the scale is too small to block the pipeline to affect the heat transfer efficiency. It has a great influence on the safety and economic operation of the air compressor, so it must be removed. When the screw press of the air compressor station is running for 2 3 months, the cooler will be blocked and cannot be driven normally. The initial cleaning method is to remove the cooler, use the impact drill, use the square steel to make the drill bit, and cool it with water. Drilling, time-consuming, and labor intensive, and frequent damage due to continuous operation of the impact drill.

In the normal air supply, 34 air compressors are required to be installed. In order to ensure normal underground production, drilling is carried out every month, and oil leakage occurs in the extremely easy-drilling water pipes, resulting in the scrapping of the entire cooler. Each air compressor has to be replaced with a new cooler every six months, and each cooler is worth more than 20,000 yuan, which not only affects production but also causes serious economic losses.

We have introduced Ingersoll Rand's super scale cleaning agent, which is mainly used for the removal of scale in compressor water circulation double system pipelines, and the cleaning agent contains high-efficiency corrosion inhibitor to make tubes of different materials. The wall does not cause chemical damage, safe and efficient.

Specific cleaning method: Select QCW25-70 type wind-driven sand-discharging submersible pump produced by Changzhou Peace and Mining Equipment Factory, and make a container according to the size of the pump. It can directly connect with the inlet and outlet of the pressure fan through the valve control, according to the scale and The pH is greater than 7.5, the pH is greater than 7.5, and the pH is greater than 7.5, and the pH is greater than 7.5, and the pH is greater than 7.5. Add some cleaning agent stock solution to make the PH less than 7.5. Repeatedly, until the pH value remains below 7.5, the detergent can be neutralized, and the pipeline is washed with water to wash the residue. net.

3 effects

Through the cleaning of No. 5 air compressor cooler of R&F Mine Air Compressor Station, the effect is quite good: no need to disassemble the radiator, only one person should add cleaning agent every 30 minutes and test with PH test paper, saving time and effort.

No manual drilling with impact drills is used to avoid pipeline leakage. Six air compressors can save about 10 coolers per year, which saves material costs by more than 200,000 yuan per year. ! At the same time, in order to more accurately grasp the cleaning cycle, a flow meter is added to the inlet pipe of each air compressor, and the flow rate through the cooler is monitored in real time to judge the blockage of the cooler, and the cleaning is timely.

4 Conclusion

The above is the author's experience in the removal of scale in the use of water-cooled air compressors. With the development of technology, the high intelligence and high reliability of water softening will prevent the formation of scale or the thickness of scale from the source. Within 2 mm to improve the use and service life of the cooler. The key to the success or failure of geomembrane anti-seepage performance, therefore, it is necessary to do the welding of geomembrane to ensure the welding quality. Therefore, the geomembrane welding is carried out by the manufacturer to send professional and technical personnel to the site for operation, guidance, training, and the use of special welding equipment for geomembrane. The geomembrane welding of this project adopts ZPR 210V heat sealing geomembrane welding machine, and the geotextile is stitched by hand-held sealing machine.

(3) The welding process of the two-film-film composite geomembrane in this project: the laminating film is turned over and the bottom layer is laid over the seam (4) Welding process: After the first geomembrane is laid, the side to be welded is turned over. Stack (width about 600 mm), the second reverse is laid on the first film, adjust the edge of the two film welding edges to make it overlap 100 mm.

(5) Before welding, blow off the sand, mud and other dirt on the membrane surface to ensure the membrane surface is clean. Place a long wooden board under the welded part to ensure the welding machine walks on the flat base surface to ensure the welding quality. Before the formal welding, test welding according to the construction temperature, determine the walking speed and the welding temperature, generally grasp the walking speed of 1. 5 m / s 2. 5 m / s, the welding temperature is 220 300.

4) The anchoring and anchoring of composite geomembrane is related to whether it can form a closed anti-seepage body. The lower anchoring should be completed after the construction of the anti-seepage body in this section, and can be carried out after approval by the supervisor. The upper anchor is to be laid on the composite geomembrane to be laid and spliced, and the protective layer is poured after construction.

5) Protective layer and masonry laying geomembrane 100 mm thick protective layer of soil must be screened, no particles larger than 2 mm in size are allowed, otherwise the geomembrane is easily pierced. The protective layer of soil must be beaten and compacted to ensure that the dry weight is above 1.5, and samples are taken at any time. When laying the protective layer and laying the masonry face, be sure to put it lightly so as not to break the geomembrane. Under the stone face, a 200 mm thick gravel cushion is placed to prevent the earth protection layer from being affected by factors such as changes in water level, wind and waves. The stone is paved with artificial hanging lines, and the stone should be tightly embedded.

4 use effect

After being put into use, the effect is good, which not only solves the leakage problem, but also satisfies the water storage function, and also plays the role of beautifying the environment, and greatly saves investment.

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