Design of exhaust system for purification workshop
Design of exhaust system for purification workshop
The position of the air outlet in the purification pharmaceutical cleanroom is determined by the production process. The function of the air exhaust removes the harmful gas and dust emitted during the production process; heat exhaust. How to scientifically design the exhaust system can not only meet the process requirements, but also save energy consumption, because the exhaust air volume increases, the fresh air volume also...
Text label: purification workshop exhaust system, clean pharmaceutical cleanroom system design
Design of exhaust system for purification workshop
The position of the air outlet in the purification workshop is determined by the production process. The function of the air exhaust removes the harmful gas and dust emitted during the production process; heat exhaust. How to scientifically design the exhaust system can not only meet the process requirements, but also save energy consumption, because the exhaust air volume increases, the fresh air volume also increases, and the energy consumption will increase. Taking the crushing, sieving and purification workshop of the solid preparation workshop as an example, to discuss the design method of the exhaust system. The first process of entering the production workshop is crushing and sieving, and the dust-generating points of the crushing process are mainly at the feeding port and discharging If you are not familiar with this process, it is also a method to set up an exhaust hood according to the position of the dust production point, but this method has a large amount of exhaust air and poor dust removal effect. The effect of different methods is different; the dust generation at the feeding port of the pulverizer is not large, and a small exhaust hood can be set to remove the dust particles emitted during feeding.
The key to the design of the exhaust system is the design of the exhaust scheme. Through in-depth understanding of the production process and familiarity with the characteristics of dust and heat generation, an effective dust capture and heat exhaust scheme can be formulated, but all measures cannot affect the production process. The operation should not increase the hidden danger of dust collection and dust production in the purification workshop, that is to say, the facilities for dust removal, heat removal and dust capture should not collect or produce dust; the form and installation position of the exhaust hood should be carefully Considering that the exhaust hood is required to be made of stainless steel plate, it should be installed directly above the dust-generating point, but this position is usually also the location of the high-efficiency air supply; especially in the purification workshop with a small area, there is only one air supply. , place the air outlet above the work point to be protected as much as possible. The position of the air outlet remains unchanged, the shape of the exhaust hood is changed, and a non-centrally symmetrical exhaust hood is used, so that the feeding port is covered by the exhaust hood and is also in the mainstream area of u200bu200bthe air outlet, so that there is a mainstream area of u200bu200bthe air outlet. With the protection of high cleanliness, the feeding port will not be polluted, and its dust will be discharged in time without cross-contamination to other operations; the elevation of the exhaust hood is as high as possible without affecting the feeding In order to ensure the effective suction of the mask mouth, it is generally advisable to keep the mask mouth at 300mm from the feeding port. The position of the exhaust hood remains unchanged, and the shape can be centrally symmetrical or non-centrally symmetrical to adjust the position of the air outlet, and at the same time adjust the position of the return air outlet, so that the feeding port is still in the mainstream area of u200bu200bthe air outlet. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for purification workshops and clean workshops.
After the position and shape of the exhaust hood are determined, the exhaust system can be determined. For the working points that generate harmful gases and heat, the exhaust air should be exhausted to the outside; The exhaust air is concentrated in one system and discharged after treatment, or a single exhaust fan unit can be set up. In the exhaust system, it must be set: shut-off valve, medium-efficiency filter, check valve and rain-proof louver; the shut-off valve is set at the hood opening It can be manually opened and closed indoors, and closed in time after the exhaust is stopped; a medium-efficiency filter can be installed in the general exhaust system. Pollution; in the exhaust system, what filter should be installed should be determined according to industry standards and production process requirements. The check valve should be installed on the positive pressure exhaust pipe section behind the filter, preferably away from the outdoor exhaust port More recently, it plays a double insurance role; for a system where the exhaust outlet is rain-proof louver, if a medium-efficiency filter has been set in the exhaust system, it is not necessary to set a check valve in effect, but during the review of drawings and project acceptance, some People attach more importance to check valves than filters.
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