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Technical Information

Related selection of air bag for dust collector air compressor and calculation of compressed air consumption

05/31/2019 Views: 622 05/31/2019

    滤筒除尘器 防爆除尘器 ,这三种除尘器需要用到压缩空气,而压缩空气是由空压机制备的,因此客户在采购除尘器的时候,要根据除尘器所需压缩空气的量来选择空压机的大小。 Bag type dust collector , cartridge dust collector , explosion-proof dust collector , these three types of dust collectors require compressed air, and compressed air is prepared by air compressors. Therefore, when customers purchase dust collectors, they must The amount of compressed air is required to select the size of the air compressor. So, what are the precautions for the dust removal system's requirements for compressed air and the selection of the corresponding air compressor and supporting equipment before selection? How to choose an air compressor? What is the role of the gas storage tank? How to calculate the compressed air consumption of the dust collector? Noda Environmental Engineering Technology (Changzhou) Co., Ltd. will elaborate on this article for you.


Precautions before selecting air bag for dust collector air compressor


① Select the corresponding air compressor and supporting equipment according to the compressed air requirements of the bag-type dust collector, filter cartridge dust collector, and explosion-proof dust collector. The following points need to be considered:


a. To reduce the oil content in the compressed gas, a degreasing purifier can be used. If the required treatment index is high, multi-stage treatment can be used.


b. To reduce the water content in the compressed gas, supporting water removal equipment can be used.


② Select the type of air compressor structure, such as vertical, horizontal or angle, according to the production tasks of the bag type dust collector, filter cartridge dust collector, explosion-proof dust collector, and the specific conditions of the workshop.


③According to the exhaust volume and exhaust pressure required for the production of bag-type dust collector, filter cartridge dust collector and explosion-proof dust collector, select the appropriate air compressor model. It should be noted that the exhaust volume listed in the air compressor sample or product catalog is generally calculated as the gas volume at 20 ° C and 101.33kPa, the unit is m3 / min, and the exhaust pressure is expressed in Pa (gauge pressure). When the performance parameters of the air compressor need to be determined, the following aspects should be considered:


a. Exhaust pressure. The higher the exhaust pressure of the air compressor, the more energy it consumes. The sum of the operating pressure, the resistance loss of the pipeline and the pressure of the supporting equipment is set as the lower limit value of the rated exhaust pressure of the selected air compressor. In general, the diameter of the gas pipeline should be selected to reduce resistance loss and achieve long-term operation to reduce energy consumption. Do not choose an air compressor with excessively high exhaust pressure.


b. Displacement. Calculate the actual total gas consumption and multiply it by a factor of 1.1 to 1.2, and use it as the exhaust volume of the selected model of bag dust collector, filter cartridge dust collector, and explosion-proof dust collector. If the selection is too low, the specified value for the bag type dust collector, the filter cartridge dust collector, and the explosion-proof dust collector cannot be reached. If the selection is too large, it will cause a large load reduction energy consumption and uneconomical operation. Gas compressors also have higher purchase costs.


④Be considerate before purchasing to avoid problems when using bag filter, cartridge filter and explosion-proof filter.


How to choose an air compressor


When selecting an air compressor, the air supply of the air compressor is mainly considered. The air compressor used in the dust removal equipment generally has a pressure of 0.8Mpa. Next, the compressed air supply amount of the air compressor will be calculated.


1. Air consumption of plateau 3-inch pulse valve for one injection: Q1 = 500 liters (standard state)


2. Pulse spray interval: t = 5s


3. Air consumption of the dust collector for one minute: Q2 = 500 × 60/5 = 6000 liters


4. The amount of compressed air converted to 0.8Mpa: Q3 = Q2 / 8 = 750 liters (compressed state)


Considering that in addition to the pulse valve to consume compressed air, there are also components that consume compressed air such as cylinders and air cannons. At the same time, the pulse valve itself allows trace leakage of compressed air (nearly zero). Keep a certain amount of air volume.


5. Take the safety factor: K = 2.5 (empirical value)


6. The theoretically calculated compressed air consumption: Q = KQ3 = 1875 liters (compressed state at 0.8Mpa)


This requires that the selected air compressor must provide a compressed air volume (0.8Mpa) of 1875 / min. In the actual selection, the compressed air consumption of 2 ~ 3m3 / min is more suitable.


The above calculation process considers the case where only one pulse valve is working at the same time. Under certain complicated dust removal conditions, such as the dust concentration of the flue gas entering the dust collector is particularly high, even reaching more than 1000g / m3, at this time, at the same time, only one pulse valve can no longer meet the requirements of dust removal. . In this case, it is required that at the same time, two pulse valves or even more than three pulse valves work at the same time. Consumption of compressed air has increased accordingly. The calculation of consumption is similar to the above.


gas tank


The role of the air storage tank is to store sufficient air volume to ensure the air consumption of the air components of the dust collector; at the same time, it also plays a role in stabilizing the pressure of the compressed air: that is, the air pressure of the gas source remains relatively stable when the air consumption components are working The situation that the dust removal equipment cannot operate normally due to the unstable pressure of the air source will not occur.


When selecting a gas storage tank, the main consideration is the capacity of the gas storage tank. According to practical experience, after the pulse valve is sprayed, the pressure drop of the gas source pressure of the gas storage tank should not exceed 0.02Mpa.


How to calculate the compressed air consumption of the dust collector?


So far, I have seen all the information on the calculation of the compressed air consumption of bag dust collectors, filter cartridges, explosion-proof dust collectors, pulse valve consumption + poppet valve consumption (according to the working mechanism, use Gas larger value), the compressed air consumption is used to submit to the owner to select the air compressor system.

The poppet valve consumption is very small under "on-line dust removal", and this article does not discuss the calculation;

The main compressed air consumption is the gas used by the electromagnetic pulse valve for cleaning. The most common calculation formula is: Air consumption L = 1.5 * n * Q / T (where 1.5 is the margin and n is the total number of single dust collector pulse valve designs. , Q is the single injection volume of a single valve, T is the injection cycle)

First of all, the data of each pulse valve manufacturer is different. The data has seen that the single injection volume of the 3-inch submerged single valve is 250-300 liters (the injection pressure and the diaphragm opening time are not specified). Bookmark: 3 inch submerged valve 0.3-0.35MPa injection pressure, injection time 0.1ms, single valve single injection volume of 450 liters, or even 480 liters under the same conditions (sufficient situation of airbag design) .


Secondly, some data of the T-injection cycle directly write the dust concentration at the inlet of the dust collector to estimate how many minutes, and some books write the inverse calculation of the injection cycle T based on the resistance value of the dust collector. In the case of inverse calculation, The resistance is divided into clean filter bag and dust collector structural resistance, which is basically a fixed value (some suggestions are about 125Pa, some are more than 300 Pa); the other part of the resistance is the dust resistance adsorbed on the surface of the filter bag. The calculation formula is relatively simple. However, the value of the parameter has almost no origin. P resistance value = dust specific resistance coefficient * filtration speed * filtration speed * flue gas dust concentration * cycle. We believe that this cycle can be used as the pulse valve injection cycle T, and the system pressure difference reaches 1200Pa. When spray cleaning is performed, the inversely calculated period T is used as the pulse valve injection period to calculate the gas consumption L of the electromagnetic pulse valve. Here, it is difficult to take the value of the dust specific resistance coefficient. The value is different under different working conditions, and this value has no basis to check.


Regarding the several questions listed above, Noda Environment has summarized and organized clear text answers for you. I hope to help you when you choose an air compressor!

专业从事袋式除尘器、滤筒除尘器、防爆除尘器、污泥固废废气粉尘及节能干燥设备的研发、设计、制造、安装与售后服务,可为您提供专业、高性价比、环保型的定制化解决方案,欢迎咨询24小时技术电话(同微信):薛先生13706116059 。 Nengda Environmental Engineering Technology (Changzhou) Co., Ltd. specializes in the research and development, design, manufacturing, installation and after-sales service of bag dust collectors, cartridge dust collectors, explosion-proof dust collectors, sludge solid waste gas dust and energy-saving drying equipment. You provide professional, cost-effective, and environmentally friendly customized solutions. Welcome to consult 24-hour technical telephone (same WeChat): Mr. Xue 13706116059.


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