The first phase of the printing and fermentation technology communication compressed air cooler design Jin Weiping, Feng Jian, Zhu Hongpiao, Zhejiang MSG factory Yiwu City 2 å¨ Preface glutamic acid fermentation is a liquid deep aerobic fermentation, the cultivation process needs to supply a large amount of sterile compressed air. The air contains a variety of microorganisms and dust sand, especially in the south, the climate is warmer and more humid, and if the bacteria are not effectively sterilized, the air in the environment is sent to the fermenter, which will lead to dyeing during the fermentation process. Bacteria, causing significant economic losses. How can we effectively remove these microorganisms and dusty sand? According to the relevant information, the microorganisms in the air are more bred by bacteria and bacteria, and there are also yeast molds and viruses. These microorganisms vary in size and are usually attached to dust or fog in the air. Drop it. The amount of bacteria in the air is generally a knife in summer. Winter is half less than summer. In winter, the air is dryer than in summer, and the moisture content is low. Therefore, the lower the moisture content in the air, the less the number of bacteria contained. Therefore, we can try to reduce the moisture content in the air, so that most of the water vapor will condense into droplets, and the bacteria will be attached to the droplets to eliminate the bacteria. The saturated moisture content in compressed air and the pressure of compressed air, the temperature relationship is shown in the table. The saturated moisture content in the compressed air (time) air temperature, the absolute pressure of the air, and the seal is printed. Printed by Jin Yinping, Jin Jianping, Feng Jian, Zhu Hong from the compressed air cooler design, a gas J. T11 eleven fly one by one. It can be seen from the table that the lower the temperature of the compressed air under the same pressure, the less the moisture content in the air. Therefore, we can take the high-temperature compressed air from the compressor to cool first, so that the temperature of the compressed air is lowered, and the moisture content is reduced (a part of the water vapor condenses into droplets and then separates the oil water and most of the bacteria through the cyclone separator, and then passes through The jacketed heater heats the compressed air to a level of 35 to allow the compressed air to enter the filter at a lower relative humidity, thereby increasing the filtration efficiency of the filter. When the compressed air is shown, the moisture content is retained, and the relative humidity of the air after compression is two. If the compressed air in this state is raised to its moisture content of 35, the resistance is unchanged, according to the same as the one of the factory Dingxi and the meteorite The mouth of the compressor is the air temperature of the public powder. The first one is a one-two training, one is a one, and the other one is a singularity. After the compression, the air has become saturated air, so its relative humidity is cooled to the compressed air. The moisture content of the steam is 10 when the saturated steam pressure of the water is equal to the saturated steam of the water. Therefore, the phase of the air is doubled. The fear of the device is a pair of humidity, and the second is to ensure that the filter medium is dry, the pressure drop is small, the resistance is small, and the sterilization effect is improved. According to the above analysis, the sterilization effect of the air cooling sterilization system is good or bad, and the cooling effect of the cooler plays a key role. Cooler design and design parameters Air volume resistance air compressor air pressure dry bulb temperature two relative humidity out compressor air pressure several compressor inlet air moisture content two dry air. Compressor inlet air water vapor partial pressure tens of thousands of steam than heat first stage air cooler cooling area calculation first stage air cooler to cool compressed air to cooling water temperature from 35 to dry air weight two o dry The amount of condensed water condensed by the air to the compressed air is equal to the heat load of the first stage air cooler. The compressed air is cooled to the released heat. The water vapor in the compressed air is condensed by the cooling to the released heat. The heat released by the water is checked by the saturated steam. The vaporization latent heat of the water vaporization technology communication volume is the first temperature difference flat compressed air temperature two shirts two hunger one praise the first stage cooler cooling area to take seamless steel pipe The heat transfer coefficient is the same as that of the tube in the cooler. The first stage air cooler cooling area is calculated. The second stage air cooler cools the compressed air from 10 to the temperature of the frozen brine. The calculation method of the second stage air cooler heat load turtle two core average temperature difference = because the compressed air is cooled by the first stage air cooler, most of the oil water is separated, According to the relevant information, it is advisable that the cooling area of ​​the second-stage air cooler is long and hungry. The structure design of the lining cooler takes into account that the total heat transfer area of ​​the finned tube heat exchanger is larger than the same number of tubes, the tube length of the tube heat exchanger is many times larger, and the heat transfer area is equal. There are advantages such as low cost, small size, and land occupation. Therefore, the original cooler uses a heat transfer tube as a longitudinal circular finned finned tube riser heat exchanger. The wall of the pipe is thick, the compressed air is taken between the pipes, and the cooling water is taken inside the pipe. Taking the outer diameter of the cooler as an example, the tubes in the cooler are arranged as shown in the figure. However, according to the long-term use, the original cooler has the following disadvantages. First, the compressed air between the tubes has no baffles in the housing, and The area of ​​the six arc-shaped gaps between the heat transfer tubes and the inner wall of the casing is about the gap between the heat transfer tubes. Due to the large area of ​​the curved voids, the hydrostatic resistance of the compressed air is small, so that about the air flows through the six arcuate gaps, so that the cooling effect is affected. In addition, since the flow direction of the compressed air is perpendicular to the fins, Corrosion of some corrosive gases in the air will cause the fins to fall off and accumulate after one year, thus greatly reducing the heat exchange area. At the same time, since the pipe wall is only thick, it is found that the heat transfer pipe wall is corroded and broken in one year. Secondly, the cooling water in the pipe, because there is only one process in total, and there is no water distributor, this causes the cooling water in some heat transfer tubes to not flow, so that the heat exchange area is not fully utilized. In order to make up for the shortage of the original cooler, the new cooler adopts a seamless tube with a heat transfer tube as a raft, a riser-type single-shell heat exchanger, and a plurality of round-shaped baffles arranged in a staggered manner in the housing. The baffle spacing is controlled by a spacer tube that is placed over the tie rod. In this way, the compressed air between the pipes can ensure the first-in-first-out tortuous flow, the flow rate is increased, the flow direction and the cooling water flow direction are perpendicular to each other, the heat exchange is promoted, and the heat exchange effect is improved. In addition, in the upper and lower water chamber of the cooler, the first phase of Jin Weiping, Feng Jian, Zhu Hongpong compressed air cooler design welded baffles, the whole tube is divided into several groups, so that the cooling water in the pipe can only flow through a group of pipes, Then flow into another set of tubes, which ensures that all the heat transfer tubes have cooling water flowing, so that the heat transfer area is fully utilized, and the cooling water flow rate is increased, the cooling water is in turbulent flow, and the heat transfer tube is reduced in dirt. The generation increases the heat transfer coefficient. At the same time, the chance of heat exchange between the cooling water and the compressed air increases. This facilitates the cooling of compressed air and the full utilization of water resources. Actual use According to the operation test for a period of time, the temperature of each point of compressed air can be seen from the table. After adopting the new cooler, the temperature of each point of the compressed air meets the design requirements, and the temperature is raised by the jacket heater. After 35, the relative humidity of the compressed air entering the filter is below. Therefore, the author believes that the filter can be kept dry at all times, the filter medium will not be deformed by moisture, and the filtration efficiency will be lowered. The bacteria adsorbed in the filter medium will also be lost due to drying. Living environment can not survive. Therefore, depending on the fermentation situation, the filter sterilization cycle is appropriately extended, which saves the sterilization steam consumption, reduces the energy consumption, and prolongs the service life of the filter medium. Table compressed air points temperature serial number primary cooler secondary cooler primary cooler sequence primary cooler secondary cooler primary cooler outlet / outlet l cooling water temperature difference 弋 export / export cooling water temperature difference average on the first The wearable parts of the sheet need to be removed and replaced regularly, so the bearing bush should be made of wear-resistant cast iron without sealing and lubrication. Because the transport material filter residue has the function of lubricating the bearing bush. Install the support screw bearing on the end plate of the machine slot. The drive end should use a single row tapered roller bearing to withstand the axial force generated by the resistance of the material to be transported, and the other end uses a double row radial spherical bearing. The long slot is not covered and is open. In this way, it is convenient to observe the operation of the equipment and eliminate the fault in time. The whole equipment is installed in the feeding direction of the forward and downward inclination, which can change the disadvantages of the running resistance of the screw conveyor and the power consumption. The machine has been in use for two years since the company has been used, and has never been faulty, and has not repaired wearable parts. In addition, the machine has a low rotation speed and a continuous use time, which can extend the service life of the machine. The utility model has the advantages of simple structure, stable operation, no noise, safe and convenient operation, low manufacturing cost and the like. As long as the operator opens the equipment before the plate frame filter press unloads the slag, the incoming material will be pushed forward by the spiral blade evenly, safely and smoothly reach the destination, and will not run out of the slot. 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