Successful application of micro-heating (waste heat) regenerative compressed air dryer

1 Overview At present, the most commonly used compressed air dryers in China are mainly two types of refrigerating type and adsorption type. The freezing type drier is affected by ice condensation caused by condensation of water, so the pressure dew point temperature can only reach +2. Above, in order to obtain a lower dew point temperature, only an adsorption dryer can be used. The adsorption dryer has a dew point of 40 or higher, which can meet the requirements of high quality gas. The suction-type household dryer is suitable for obtaining dry compressed air according to the principle of pressure-free adsorption, in addition to compressing the moisture in the air, and the structure is slave-bridge type, and the concrete is subjected to adsorption drying under working pressure, and another The tower desorbs and regenerates the adsorbent under normal pressure. After a period of time, the two towers alternately work to continuously obtain dry compressed air. According to the different methods, the adsorption dryer can be divided into electric heating regenerative micro heating electric heating regeneration. There are several types of micro-heating waste heat regeneration type and no heat regeneration type. This paper mainly gives a brief overview of micro-heating waste heat regeneration for users' reference.

2There is no heat regenerative compressed air dryer. The original factory has two 208 oil-free lubricating compressors produced by Liuzhou No.1 Air Compressor Factory. It is equipped with a Taiwan, No. 208 heat-free regenerative compressed air dryer. The press is installed in parallel and used in combination with the hot drier. The air is planted as a non-heating dryer. The following air is compressed by the compressor and enters the gas storage tank. Under the pressure, some water can be precipitated and saturated. When the compressed air enters the dryer, it is the working pressure. The date of acceptance is 2004 Li Liqing 1968, engineer; 545006 Liuzhou, Guangxi.

Metallurgical energy 208 oil-free compressor 2 stage cooler 3 shut-off valve 4 gas storage tank 5 degreasing filter 6012, 1 no heat. The temperature of the desiccant filter of the dryer 7 requires 38 compressed air to enter through the shuttle valve and enter the ± bridge. At this time, the partial pressure of water vapor in the air in the tower is higher than the dew point of the adsorbent, and the compressed air can be 20 or less. The outlet of the tower is divided into two roads. The air of about 85 is used by the single valve and the filter for each air point. The 4 channels are about 15 and the throttle is reduced to normal pressure and then enters 8 towers. Desorption is carried out. The factory passes the muffler to the fire, and the time of each tower is 5 controlled by the controller. Complete the automatic switching work.

Since the regeneration air consumption of the non-heat dryer is 15 of the intake air amount, and the actual gas consumption is related to the working pressure, the regeneration gas volume is larger than the gas pressure, and the regeneration gas volume is 30 or more when the pressure is low. , resulting in real; reduced gas consumption, high energy consumption, which is also a major feature of the athermal dryer. Therefore, the actual gas supply meter of the water plant is greatly reduced by 201, and sometimes it is reduced to 0.5, the following. In this way, the gas pressure cannot meet the needs of the gas points. The more serious effect is that since the working principle of the adsorption dryer is pressure swing adsorption, the difference between the adsorption and desorption pressures of the two towers is better, when the working pressure drops. When it is 0.5 or less, the adsorption effect is remarkably lowered, so that the desired dew point temperature is not obtained, and the regeneration effect of the adsorbent is also affected. This is the case. The suction performance will be greatly reduced. Shorten the service life of the adsorbent In order to improve the performance of the compressed air, it can meet the requirements of gas consumption without increasing the cost. After careful comparison, it is hoped that the heat of the compressor can be used to heat the regeneration air of the dryer. Thereby reducing the regeneration gas consumption and increasing the actual small gas volume. So decided to transform the original no-heat dryer into a heat dryer.

Working principle and structural characteristics of 3 heat regeneration dryers 3.1 Working principle of heat dryer The piston type oil lubrication compressor stage exhaust gas 1 temperature is 4061 and the waste heat regeneration type 10 dryer is using air compressor class. The waste heat of the exhaust outlet heats the regeneration air, so that the regeneration air is reduced from the original gas consumption amount 15 to 5. The waste heat dryer gold energy dryer 6 dust filter 7 throttle valve 8 solenoid valve 9 gas cylinder 10 cut-off wide dryer The type of transformation costs 10,000 yuan of energy consumption to form 8 hours of energy per day. 300 days energy consumption 1 no heat waste heat regeneration gas consumption 15 control components 0.05kW regeneration gas consumption 5 control components 0.0 at your basic working principle and design calculation micro heating waste heat regeneration 3.2 waste heat dryer structural characteristics after the transformation of the waste heat dryer The specific structure 3, which is based on the original non-thermal regenerative dryer, is also modified. The dryer line + change, the upper path and the solenoid valve are subject to high temperature, so the temperature-resistant check valve and solenoid valve are used, and the others are unchanged. At the same time, at the outlet of the air compressor stage, a heater is added, and the regeneration air is heated by the air compressor exhaust temperature to achieve the heating effect of the micro heating electric heater.

The economic effect of the 4 waste heat dryer is reduced due to the consumption of gas. The pressure drop is 0.02. The actual monthly steam reaches 2,153, which saves a large amount of energy, and also produces a huge economical helmet.

The working conditions of the air compressor station are as follows: air compressor model 208, motor power 132, dryer processing gas volume 20, can be seen from the comparison of the economic indicators of 1 two dryers, if the enterprise works for 83 days per year, working for 83 days per year. The waste heat dryer has no heat dryer. It is roughly 65.02. If it is calculated at 1 yuan per 14 grid electricity cost, it can save 3.16.8 million yuan per year. The energy saving is 65.02. The annual recoverable cost is as follows. The efficiency is more impressive and the improvement is also improved. The use of gas quality has increased the amount of gas used.

5 Conclusion Dumb through the dryer to transform the performance of the Ding good, stable use of gas quality to meet the requirements of the factory. At the same time, it is proved that the waste heat dryer fully utilizes the waste heat of the compressor and is an energy-saving product. If used in conjunction with a piston machine, it can completely replace the non-heating decanter and micro-heating heat exchanger, 1 Li Liqing. Micro-heated waste heat regenerative compressed air dryer. compression

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