【Haichuan Chemical Accident Updates】Fire at Jingwei Fine Chemicals’ exhaust emission facility in Rudong Coastal Economic Development Zone, Jiangsu
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The Rudong County Emergency Management Bureau issued a notice. According to the details, at around 7:10 on May 8, 2019, a fire broke out in the exhaust gas emission pipe (made of PP material) on the roof of the comprehensive workshop at Jingwei Fine Chemicals (Nantong) Co., Ltd., located in the Rudong Coastal Economic Development Zone of Jiangsu Province. The company immediately activated its emergency response plan and managed to extinguish the fire promptly. The specific reasons are under further investigation. Subsequently, a reporter from Modern Express learned from the Rudong Coastal Economic Development Zone that, according to preliminary investigations on site, the fire did not have any impact on the surrounding environment.
I would like to ask what materials are used for exhaust gas emission pipes in chemical enterprises? How to connect? https://bbs.hcbbs.com/thread-1667158-1-1.html (Source: Haichuan Chemical Industry Forum Website)
I. Working principle of the PP spray tower: The spray tower is primarily used for treating acid mist and waste gases generated in industrial processes. These industrial acid mist and waste gases are introduced into the spray tower through the air inlet pipe; they first pass through a packing layer, where they come into full contact with sodium hydroxide absorption solution, allowing for mutual absorption and neutralization reactions. After being purified, the acid mist and waste gases undergo dew removal via a dew removal plate before being discharged into the atmosphere by a fan. The absorbent liquid is pressurized by a water pump at the bottom of the tower and then sprayed downward from the top of the tower, before finally returning to the bottom of the tower for reuse. The purified acid mist waste gas meets the emission requirements of local provincial standards, being below the **emission standards. II. Features of the PP spray tower: 1. The spray tower has high efficiency in dust and desulfurization removal; when alkaline washing water is used, the desulfurization efficiency can reach 97% ； 2. The vertical spray tower dust removal equipment occupies less space and is easy to install ； 3. The spray tower has low water and electricity consumption levels ； 4. The spray tower is corrosion-resistant and wear-resistant in daily use, with a long service life ； 5. The spray tower equipment operates reliably, and its maintenance is simple and convenient. III. Structure of the PP spray tower: The packing layer inside the PP spray tower serves as a mass transfer device that facilitates contact between the gas and liquid phases. The bottom of the spray tower is equipped with a packing support plate, on which the packing is placed in a random pile. A packing plate is installed above the packing to prevent it from being blown by upward air currents. The spray liquid in the spray tower is sprayed from the top of the tower through a liquid distributor onto the packing, and flows down along the surface of the packing. Gas is fed in from the bottom of the tower; after being distributed by the gas distribution device, it flows counter-currently to the liquid through the gaps in the packing layer. On the surface of the packing, the gas and liquid phases come into close contact for mass transfer to occur. As the liquid flows downward through the packing layer, wall flow can occur at times. This wall flow effect leads to an uneven distribution of the gas and liquid phases within the packing layer, thereby reducing the mass transfer efficiency. Therefore, the packing layer in the spray tower is divided into two sections, with a redistribution device placed in between; after redistribution, the liquid is sprayed onto the lower layer of packing.