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There are 2 5L-40/8 air compressors and 6 4L-20/8 air compressors in our mine. The air compressor cooling system is circulating water. The water in the cooling pool is first driven by the clean water pump through the inlet pipe. The intercooler and the aftercooler are then placed in the I-stage compression cylinder and the II-stage compression cylinder; and then flow back to the cooling pool through the funnel and return pipe.
The L-type air compressor intercooler is installed between the I and II compression cylinders to cool the high temperature gas discharged from the Class I compression cylinder. The aftercooler is installed at the end of the air compressor to cool the discharge of the Class II compression cylinder. High temperature gas. The intercooler and the aftercooler are composed of a casing and a cooler core. The outer casing is welded by steel plates. The core body is a rectangular parallelepiped shape. The middle is composed of a plurality of copper pipes juxtaposed, water flows in the pipe, and compressed air flows from outside the pipe. by.
1The scale and elimination of the cooling system Because the groundwater contains high hardness of calcium and magnesium ions (the total hardness is 8.5mmol/L or more), the precipitation of salt impurities adheres to the scale on the metal heating surface, which makes the temperature of the compressed air in the body rise. It affects the safe operation of the air compressor. The intercooler core and the aftercooler core are often blocked by scale, and the cooler core has to be replaced for up to two months. In order to reduce the formation of calcium and magnesium ions in the cooling water and slow down the formation of scale in the cooling system, effective measures are required.
Eight air compressors are distributed in three mines. If a sodium ion exchanger is installed in each mine, the cost is too high and another method must be found.
First, the formed scale is removed by pickling. That is to use 10% acid pickling solution with concentrated hydrochloric acid, add 0.20% multi-purpose compound pickling inhibitor Lan-826, put it in a homemade container, and use an acid-proof pump to drive into the air compressor body, wait for several When the return pipe has the cleaning liquid flowing out, close the valve, stop the pump, start the air compressor, and the standby body is slightly hot (about 50 ~ 60 °C), stop, suffocate for about 4h, open the return pipe and connect the upper pipe to the water pipe. On the top, rinse with tap water for 10 minutes, open the cylinder head and find that the body has exposed its natural color (red paint), and the copper tube in the intercooler core and the aftercooler core has exposed copper.
Secondly, the scale water is treated with scale inhibition. Because of the high hardness of calcium and magnesium in the water and suspended solids, it is first treated with polycarboxylic acid scale inhibition method, using hydrolyzed polymaleic anhydride (HPMA), due to the acidity of HPMA. For the substance, adjust the pH of the circulating water to 9.0 with Na 3 PO 4 , then add HPMA at 5 mg/L, and check the scale inhibition effect after running for several months.
2 Descaling effect The air compressor cooling cycle system is improved, which fundamentally eliminates safety hazards and ensures the safe operation of the equipment.
After pickling, the scale inhibitor method is used to prevent the formation of scale in the machine body, and the service life of the intercooler core and the aftercooler core of the air compressor is greatly prolonged. It is necessary to replace a set of cooler core every 2 to 3 months. And now a set of cooler cores can be used for more than two years. After purchasing the cooler core, 5L-40/8 air compressor, the cooler core should be 7,000 yuan, the intermediate cooler core should be 5600 yuan, and after purchasing 4L-20/8 air compressor, the cooler core should be 4600. Yuan; the middle cooler core set to 4,000 yuan, the annual cost of replacing the cooler core can be 268,800 yuan. If the repair cooler core is used again, it takes 1000 yuan to repair a set of cooler cores. In this case, the annual cooling is saved. The core cost is 56,000 yuan.
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