外文翻譯--袋式除塵器在dap裝置中的應(yīng)用-其他專業(yè)-資料下載頁(yè)
2025-01-19 00:39本頁(yè)面
【導(dǎo)讀】文還討論了成功使用袋式除塵器必要的設(shè)計(jì)特點(diǎn)。斗并向上繼續(xù)運(yùn)動(dòng)到濾袋，把灰塵沉積在里面。對(duì)于脈沖式，袋子的底部是封閉的，逆氣流清灰式袋式除塵器既可以收集在濾袋里面，也可在濾袋外面。得到更好的清洗。袋的空氣由風(fēng)扇或風(fēng)扇大逆流清洗，取決于粉塵收集在濾袋內(nèi)或。機(jī)械振動(dòng)式袋式除塵器被再次劃分。來(lái)，通過(guò)電機(jī)驅(qū)動(dòng)的凸輪使袋懸浮時(shí)產(chǎn)生的間歇運(yùn)動(dòng)來(lái)進(jìn)行清灰。7kg/cm2g，通過(guò)位于每排袋頂部的一系列的公共頭注入。成了袋的變形以及濾餅的移位。濾袋被其里面的一個(gè)個(gè)金屬小籠支持起來(lái)，目的是。文的剩余部分將著重闡述脈沖式清灰袋式除塵器。如前所述，金屬絲籠被插入每袋作為支撐。供應(yīng)商利率并避免了橋接問(wèn)題。沖清灰通常足以防止一個(gè)預(yù)先設(shè)定的壓力降被超過(guò)。典型的壓力下降范圍在75到150. 凈空高度受限制的情況下，可以指定分包籠。溫控器保持在某個(gè)設(shè)定點(diǎn)，當(dāng)然整個(gè)袋式除塵器單元是絕緣的。為了其的制約因素。
【正文】 typically scrubbed only in a cyclonic tail gas scrubber located downstream of the cyclones. The pressure drop across the cyclones and the tail gas scrubber is approximately 75 mm higher than would be expected across the bag filter alone, resulting in some savings on the fan and associated motor. Since less air will be scrubbed, the size (diameter and height) of the tail gas scrubber will also be significantly reduced along with the capacity of the scrubber circulating pumps Table 2 below summarizes the relative capital costs associated with the cyclones / wet scrubber versus the bag filter option for a modern world class DAP plant rated at 1 million tonnes per year. Table 2 Total Installed Costs, US $ Cyclones / Wet Scrubber Bag Filter 17 Cyclones Fan Tail Gas Scrubber Stack $6,450,000 $7,450,000 Tail Gas Scrubber Pumps Bag Filter In summary, the bag filter option is approximately $1 million more than the traditional cyclones and wet scrubber option. Equipment Vents The airstream from the equipment vents is typically scrubbed in a venturicyclonic scrubber along with the gases from the reactor/granulator. The pressure drop across the cyclones is expected to be similar to the pressure drop across the bag filter. Since the reactor/granulator gases are now treated independently, however, both will necessitate separate fans. Since less air will be scrubbed, the size of both the venturicyclonic and tail gas scrubbers along with the capacities of their circulating pumps will be reduced. Table 3 below summarizes the relative costs in a similar fashion to Table 2 above. Table 3 Installed Costs, US $ Cyclones / Wet Scrubber Bag Filter Cyclones R/G V Fan R/G V Scrubber Primary Scrubber Pumps $10,600,000 $10,600,000 Tail Gas Scrubber Stack Tail Gas Scrubber Pumps Bag Filter Vents Fan 18 In summary both options require approximately the same capital outlay. There are energy savings that accrue from utilizing a bag filter in either option. Table 4 below summarizes the fuel oil saving from recycling the warm air from the bag filter for use as dilution air in the dryer bustion chamber. Also, the savings in power due to lower pressure drops are presented. Table 4 Cooler Equipment Vent Heat Recovered per tonne DAP (kcals / 8,318 9,416 $) Power Saving per tonne DAP (kWh / $) Annual Savings $390,000 $450,000 Note: Fuel Oil costs of $400 per tonne and power costs of cents per kWh were assumed in the table above. 5. Conclusions The use of a bag filter on the cooler airstream will require an additional capital outlay of the order of $ Million. This could be recouped in energy savings in less than three years. Provided that the warm air is recycled as dilution air to the dryer bustion chamber, installation of a bag filter on the equipment vents system is economically very upfront capital outlay is about the same as the wet scrubber option, Annual savings of approximately $450,000 per year can be realized on a Million tonne/year DAP plant. At the very least, bag filters should be strongly considered in a revamp situation when a capacity increase is desired as an alternate to building more or bigger scrubbers.
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