Journal of Liaoning Institute of Science and Technology Application of Compressed Heat Regeneration Drying Technology in Air Compressor Purification System Yan Zhengmin (Special Steel Plant of Benxi Iron and Steel (Group) Co., Ltd., Benxi 117000, Liaoning Province) has exerted its equipment efficiency.
1Overview The equipment of the original air compressor station of Bengang Special Steel Plant is aging. The compressed air produced is oily and contains serious water, which causes the winter wind pipeline to freeze or block, which cannot meet the production requirements. It is necessary to carry out technical transformation of the equipment and study the purification system. In order to solve the problem of water, oil and impurities in compressed air, reduce production heat stop time, reduce equipment maintenance cost and frequency, and maximize equipment efficiency. At the same time, the conversion of nitrogen gas to the original instrument will reduce the consumption of nitrogen, save energy and reduce costs.
2 Air compressor station main equipment and production process flow profile 2.1 The main equipment pressure is atmospheric pressure; 2.2 Process air through the pre-filter into the centrifugal air compressor, through three-stage compression, into compressed air, high temperature wet The air enters the compressed heat regeneration dryer, passes through the drying into the aftercooler and the post-dust collector, and then enters the gas storage tank and connects to the compressed air pipe network for production use. (See) Engineer.
Air Compressor Process Compressed Heat Dryer Composition, Principle and Process Flow 3.1 Composition (1) Drying tower (pressure vessel): used to fill desiccant, high temperature wet compressed air enters the drying tower, adsorbs moisture through desiccant, drying tower The bottom is provided with a support bed to further disperse the airflow while avoiding the desiccant water immersion failure; ~140 °C can be regenerated (3) Safety valve: open the valve venting pressure relief when the tower body pressure is higher than the set value.
(4) Aftercooler: It adopts shell-and-tube structure, which has high heat transfer efficiency and convenient cleaning. The high-temperature end shell is provided with expansion joints and sewage outlets, which can effectively eliminate thermal stress.
(5) Soda separator: By speed degradation, centrifugation, impact, changing flow direction, agglomeration, 99.9% of liquid water in the compressed air of refrigeration is separated, so that the dew point of the gas reaches minus 40 C. (6) Dust collector: It can effectively intercept impurities in compressed air, the dust removal efficiency is 98.5%, the filter material is ultra-fine glass fiber, and the impurity particle size is less than 0. (7) Control system: programmable PLC controller and liquid crystal text display, PLC is used for collection Process parameters and output of control actions. The text display is used to display process parameters, alarm information, input operation data, instructions, and the like.
3.2 Principle The oil-free high-temperature humid air discharged from the compressor enters the A tower, heats and regenerates the desiccant in the A tower, and then enters the post-cooler and water separator. The liquid water is separated and then dehydrated and dried in the B tower. At this time, the desiccant of the A tower is regenerated by the high temperature air, and the B tower is subjected to the drying process, and the dried compressed air is discharged from the outlet of the dryer and used in the pipe network. After a period of time, the A tower is bypassed by the bypass valve, and the high-temperature humid air directly enters the cooler, the water separator, and then enters the B tower for dehydration and drying. At this time, a part of the dry air is taken from the outlet of the dryer to perform the A tower. Cold blowing, the regeneration of the A tower desiccant is completed, and the B tower continues the compressed air drying process. After the set operation period is reached, the cold blowing ends. After the pressure of the two towers is equalized, the twin towers of the dryer are automatically switched and dried. The machine performs the regeneration process of another tower.
3.3 Process Description 3.3.1 Drying and Regeneration Process High-temperature compressed air enters the A tower, enters the post-cooler, enters the water separator, enters the B tower to dry, enters the gas storage tank, and the pipe network. (See) Process Flow Chart of Purification System 1. Drying and Regeneration Process 3.3.2 Drying and Cold Blowing Process The compressed air entering the A tower is cut through the valve, directly into the post-cooler, water separator, B tower drying, and into the storage. The gas tank and the pipe network are connected to the A tower for cold blowing after the B tower, and the A tower regeneration process is completed. (See) Process flow chart of the purification system - Drying and cold blowing process 4 Production results and effects Through the above treatment, the compressed air produced reaches the secondary compressed air standard, without oil, water, and dust content is less than. 1mg / L, the pressure dew point reaches minus 41 ° C, the air pressure reaches 0.6 MPa. Meet the production requirements, and can replace the nitrogen requirements to meet the instrument requirements. Moreover, the annual heat shutdown of the electric furnace due to the poor quality of the compressed air can be reduced for 50 hours; due to the low maintenance rate of the equipment, the maintenance cost and spare parts cost can be saved by about 150,000 yuan per year, and the annual discharge of waste oil is reduced by 1 ton, and the discharge of waste water is reduced 400. More than one ton, the comprehensive benefit reached an annual average of 1.8 million baht.
5 Conclusion This set of compression heat regeneration dryer is now in normal production and stable in operation. It has solved the situation of a large amount of water, oil and impurities in the original compressed air. After the transformation, it has reached the waterless, oil-free, impurity-free and instrument wind. Standard, the nitrogen gas used in the original instrument is converted to compressed air, which reduces nitrogen consumption, reduces production heat stop time, reduces equipment maintenance costs and times, maximizes equipment efficiency, reduces energy consumption, and reduces waste oil wastewater discharge.
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