Technical transformation of refining and chemical compressor dryers Gong Xuesong (Daqing Petrochemical Company Water and Gas Plant, Daqing 163714, Heilongjiang) Daqing Petrochemical Company's water and gas plant currently has two centrifugal Ingersoll Rand compressors with a compression capacity of 12 000 m3/h ( Y4, Y5), each compressor is equipped with a set of compression heat regeneration drying system with corresponding processing capacity; there are 3 5L reciprocating compressors (Y1, Y2, Y3) with a design flow rate of 2400m3/h, 3 sets There are 2 sets of non-thermal regenerative drying systems for the compressor. The Y4 compressor rear dryer was technically modified, and the original heatless regenerative dryer was transformed into a compression heat regeneration drying system. After the Y4 supporting dryer was modified, the energy saving effect was very remarkable, and the instrument wind quality was improved. 1 Regeneration and drying equipment The technology of regenerative drying system is at the domestic leading level. It is the technology of American Newmantek Company. It is assembled and produced in China (Wuxi). The dryer tank and pipeline adopt domestic products, and the automatic control system and valves adopt American components. Therefore, The characteristics of this drying system equipment are: reliable technology, low price and 2 advantages in use. The heat generated by the final compression of the compressor is used to regenerate the desiccant, which saves the regeneration gas heating heat source. The original Y4 compressor has three-stage compression and three-stage cooling. In order to provide a pyrogen for the modified dryer, the compressor final stage coolant cooling water line is removed, and the compressor cooler root flange is blindly killed. The gas temperature at the final stage of the compressor can reach 120~135. The temperature required for the regeneration of the dryer is greater than 110. The compressed air line of the compressor outlet is kept warm. The temperature before the compressed air dryer is 118~128, which can fully meet the needs of dryer regeneration. The heat. The amount of regeneration gas loss is saved for all the hot air heated by the desiccant to be cooled and then dried and adsorbed to another tower, and the heated regeneration gas is not lost. Only in the cold blowing stage, the gas for cold blowing is vented. The regeneration gas loss is only 1%. 2 Regeneration Dryer Workflow The regenerative dryer uses the heat generated by compressor compression to desorb and regenerate the saturated desiccant. The workflow consists of two stages. After the high temperature and 100% saturated humid air is discharged by the compressor, it is directly passed through the inlet of the desiccant, heated by a tower of the advanced human dryer, and then enters the aftercooler, and then enters the human water separator, the liquid moisture After being separated, another tower of the dryer is dried, and the dried compressed air is discharged from the outlet. After 150 minutes, the tower body in the heating stage is labored by the labor valve. The high temperature saturated humid air enters the person directly after the cooler is cooled, and then passes through the water gas separation and drying before entering the pipe network, in the dryer. A part of the outlet air flows through the orifice and flows to the heated tower body, cools it, and finally discharges through the regeneration exhaust port. After 85 minutes, the cold blowing is over and the pressure is started. After 5 minutes, the pressure of the two towers is equalized. After the double tower switching, the dryer performs the regeneration process of the other tower. 3 Dryer retrofit measures Dryer retrofit measures include 6 items. (1) Remove the cooling water line from the Y4 final cooler and blindly hang the root flange of the cooler water line. (2) Remove the original dryer and use the original pipeline and dryer foundation. (3) Insulate the hot gas line that exports the compressor to the dryer. (4) Connect the compressor's original third-stage cooling water line to the dryer heat exchanger. (5) Change the third-stage temperature control index of the compressor, and change the original temperature alarm value 49 to 135 original temperature interlock value 52 to 140K6) Replace the compressor auxiliary parts: outlet check valve, outlet vent valve, compression Machine outlet expansion joint. 4 Energy saving after the transformation The Y4 dryer has been in operation for half a year and is currently running smoothly. After calibration, the energy saving effect is very significant. Before the modification of Y4 compressor dryer, the non-heat regeneration drying system was adopted. The regeneration gas consumption was 8% of the treated air volume. After the transformation, the regeneration gas consumption was 1%, and the instrument wind production increased by 840m3/h. Before the quality of the dryer is modified, the average wind dew point of the Y4 drying system is -58. The instrument wind quality often appears on the edge of the control index. Especially when it is just entering the winter, the air humidity is high, and the instrument wind and industrial wind are all dry. The drying capacity of the dryer is small, and the product quality is often unqualified. In order to make the dew point of the delivered product reach the target, the compressed air before drying is emptied (11) to regularly check the wear of the nozzle, and replace the parts in time. 6 Conclusion China's oil and natural gas, one of the main power fuels, is in short supply and is already the second largest importer in the world. Therefore, coal is still the main power coal in China. Substituting coal for oil is an established national policy. After the oil-fired boiler of Daqing Petrochemical Company was transformed into a 150t/h coal-water slurry boiler, it has been operated smoothly and safely for 6 years, achieving a win-win situation for economic benefits and environmental benefits. 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