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有机废气催化燃烧净化装置
一、概述
本系列设备，系统设计完善，附属设备配套齐全，净化效率高。自动化成度高，在国内处于领先地位。它广泛用于石油、化工、橡胶、油漆、涂装、印刷等行业中，如苯、甲苯、二甲苯、乙苯等苯类废气以及酮类、醇类、醛类、酯类、酐类、醌类、胺类、环已烷、环已烯、环已酮、甲硫醇、乙硫醇、C硫醇、二硫化碳等有机废气均能净化。它能有效地净化环境、消除污染、改善劳动操作条件，确保工人身体健康，排放出来的热量可以回用，降低生产成本。
本系列装置其特性：
● 结购紧凑，占地面积小，管理、维修筒单，操作安全。
● 自动化成度高，系统采用PLC可编程控制器控制，阀门采用电动阀门。
● 安全性能完好：系统设置了催化超温报警、风机故障、阀门故障等报警声光信号。
● 净化效率高：净化效率≥98%
● 能耗低：起燃温度低、排出气体温度可回用。
二、系统原理
废气经阻火器并经主进阀/旁通阀切换调节进入热交换器，通过热交换器的换热和电加热器的加热，使冷废气加热到催化起燃温度（一般>220℃）。然后进入催化反应床，在催化剂Pt 、Pd的催化作用下，有机物进行氧化反应生成无害的水和二氧化碳。由于催化反应放热，使反应后气体温度上升达到一定的温度值。反应后的高温气体经热交换器换热，预热源废气使气体温度升高，并且反应后的高温气体降低一定量的温度，最后经引风机排入大气。
系统启动时，首先由电加热器对催化剂进行加热，当电加热器达到设定预热温度时，自动开启引风机，主进阀开启一定量（最小设定值），当催化剂达到催化起燃温度时，通过温度控制器及可编程控制器使主进阀逐渐开启，旁路阀逐渐关闭。在对催化剂加热过程中，由于电加热功率相对较小，所以通过主进阀的风量是比较小的。大部分气体由旁通阀自然排出。随着废气反应热的不断产生和热交换器的换热，以及电加热器的加热，使预热空气温度逐渐达到设计的催化起燃温度。因此电加热功率逐渐减小直至完全停止（电加热功率根据废气浓度而定）。达到正常运行状态。
新鲜空气阀是当废气浓度过高，使催化反应温度过高>500℃时，补充新鲜空气降低浓度，从而降低催化反应温度。限流阀是调节限定气体流量而设置的。（一般配用风机流量比额定流量要大）以使设备能正常运行。系统还设置了必要的超温报警声光信号。
I overview This series of equipment, system design, ancillary equipment complete, high purification efficiency. Automation is high, is in the leading position in the country. It is widely used in petroleum, chemical industry, rubber, painting, painting, printing and other industries, such as benzene, toluene, xylene, ethylbenzene waste gas and ketones, alcohols, aldehydes, esters, anhydride, quinone, amines, cyclohexane, cyclohexene, cyclohexanone, methyl mercaptan, Acetonitrile, c mercaptan, carbon disulfide and other organic waste gas can be purified. It can effectively purify the environment, eliminate pollution, improve the working conditions, ensure the health of workers, the heat emitted can be reused to reduce the production cost. The characteristics of this series of devices are as follows: ● compact and compact, small floor area, management, maintenance bucket list, operation safety. ● automation is high, the system adopts PLC programmable controller control, valve uses electric valve. ● safety performance is good: the system sets up the alarm sound and light signals such as catalytic over temperature alarm, fan failure, valve failure, etc. ● purification efficiency: the purification efficiency is ≥ 98 % ● low energy consumption: low starting temperature, low exhaust gas temperature can be used. Ii. the principles of the system The exhaust gas is regulated into the heat exchanger by the flame arrester and through the main inlet / bypass valve, and the cold exhaust gas is heated to the catalytic ignition temperature ( general > 220 ℃ ) through the heat transfer of the heat exchanger and the heating of the electric heater. Then, in the catalytic reaction bed, under the catalysis of pt and PD, the organic matter is oxidized to produce harmless water and carbon dioxide. Because the catalytic reaction exothermic, the reaction gas temperature rises to a certain temperature value. After the reaction, the high temperature gas heat exchanger, preheating the source gas to increase the gas temperature, and the high temperature gas after the reaction to reduce a certain amount of temperature, finally through the induced draft fan into the atmosphere. When the system is started, the catalyst is heated first by electric heater, when the electric heater reaches the preset preheating temperature, the induced draft fan is automatically started and the main intake valve opens a certain amount ( minimum setting value ). when the catalyst reaches the catalytic starting temperature, the main inlet valve is gradually opened by the temperature controller and programmable controller, and the by-pass valve is gradually closed. In the catalyst heating process, because the electric heating power is relatively small, the air flow through the main valve is relatively small. Most of the gas is naturally discharged by the bypass valve. With the continuous production of the waste gas reaction heat and the heat transfer of the heat exchanger, and the heating of the electric heater, the preheating air temperature gradually reaches the designed catalytic combustion temperature. Therefore, the electric heating power is gradually reduced until it is completely stopped ( the electric heating power is determined according to the exhaust gas concentration ). Achieve normal operation status. Fresh air valve is when the concentration of the exhaust gas is too high, which makes the catalytic reaction temperature too high > 500 ℃, to add fresh air to reduce the concentration, thereby reducing the catalytic reaction temperature. The current limiting valve is set to regulate the limiting gas flow. ( the general distribution of fan flow is larger than the rated flow rate ) so that the equipment can operate normally. The system also sets the necessary overtemperature alarm sound and light signal. |
