Regenerative Catalyst Incinerator (RCO)

Comprehensive overview

RCO regenerative catalyst incinerator mainly consists of catalytic combustion bed (composed of electric heating chamber, catalytic chamber and heat exchanger), flame arrestor, temperature detector and corresponding electric valve and heat preservation pipeline. The main function is to use the electric heater in the catalytic combustion bed to heat the waste gas produced by the production line, so that the useful waste gas therein is converted into CO2 and H2O at about 280-300℃ under the effect of catalyst and a lot of heat is released. The heat is reused through a heat exchanger.

Working Principle

VOCs catalytic combustion treatment device will collect the waste gas, through the rotary valve into the heat storage layer beforehand, the heat storage layer will transfer heat to the waste gas, the waste gas reaches the reaction temperature, the oxidation reaction occurs on the catalyst layer, the reaction of the gas through the other heat storage layer, the heat will be transferred to the heat storage layer, the gas is cooled, and the temperature of the heat storage layer is elevated. At a certain level, the gas flow direction is reversed, and the untreated low-temperature exhaust gas enters the heat storage layer of the previous cycle, and then the catalytic reaction occurs, and then the heat is transferred to the cooled heat storage layer of the previous cycle. Such cyclic operation realizes the catalytic oxidation reaction of pollutants and the circulation of heat.
Catalytic purification is a typical gas-solid phase catalytic reaction, the essence of which is the deep oxidation with the participation of active oxygen. In the process of catalytic purification, the role of catalyst is to reduce the activation energy, while the catalyst surface has adsorption, so that the reactant molecules enriched in the surface to improve the reaction rate, accelerate the reaction; with the help of catalyst can make organic waste gas in the lower ignition temperature conditions, flameless combustion and oxidative decomposition of CO2 and H2O, and at the same time, a large amount of thermal energy, so as to achieve the removal of harmful substances in the waste gas. The method of removing harmful substances from exhaust gas.
In the process of catalytic purification of exhaust gases, the exhaust gases are fed into the heat exchanger by a fan through a pipe, which heats the exhaust gases to the starting temperature required for catalytic combustion. The preheated exhaust gas passes through the catalyst layer to be burned. Due to the role of the catalyst, the catalytic combustion method of exhaust gas combustion of the starting temperature of about 250 to 300 degrees Celsius, much lower than the direct combustion method of combustion temperature of 650 to 800 degrees Celsius, high temperature gas into the heat exchanger again, cooled by the heat exchange, and ultimately to a lower temperature by the fan discharged into the atmosphere.

System Components

The RCO consists of a pretreatment unit, a preheating unit, a catalytic combustion unit, and an explosion-proof unit.
① Exhaust gas pre-treatment: In order to avoid clogging of the catalyst bed and poisoning of the catalyst, the exhaust gas must be pre-treated before it enters the bed, so as to remove the dust, liquid droplets and poisons of the catalyst in the exhaust gas.
② Preheating device: preheating device includes exhaust gas preheating device and catalyst burner preheating device. Because the catalyst has a catalytic activity temperature, catalytic combustion is called the catalyst ignition temperature, must make the exhaust gas and bed temperature to reach the ignition temperature in order to carry out catalytic combustion, therefore, must be set up preheating device. But for the exhaust gas itself is higher temperature occasions, such as enameled wire, insulation materials, baking paint and other drying exhaust, the temperature can be up to 300 ℃ or more, it is not necessary to set up a preheating device.
③Catalytic combustion devices: generally fixed-bed catalytic reactors are used. The design of the reactor is carried out in accordance with the specifications and should be easy to operate, easy to maintain and easy to load and unload catalyst.
④Explosion-proof device: it is a diaphragm pressure relief and explosion-proof device, installed on the top of the main machine. When an accident occurs in the operation of the equipment, it can be cracked open in time to relieve pressure and prevent accidents from occurring.

Catalyst Selection

 Precious metal catalysts (Pt, Pd and Au) have low ignition temperature (ignition at 280°C), high removal efficiency (>95%), high catalytic activity, and are also resistant to high temperature, oxidation and corrosion. The catalyst changes the speed of chemical reaction without participating in the reaction itself, so there is basically no consumption before and after the reaction, and it has a long service life.

Field of application

● RCO plants can be directly applied to the purification of organic waste gases with medium to high concentrations (100 mg/m3 – 10,000 mg/m3);
● RCO can also be used in activated carbon adsorption concentrate catalytic combustion systems to replace the catalytic combustion and heater section;
● RCO treatment technology is particularly suitable for applications with high demand for heat recovery, as well as for applications where the composition of the exhaust gas changes frequently or the concentration of the exhaust gas fluctuates considerably on the same production line, depending on the product.
● Application industries include automobiles, shipbuilding, motorcycles, bicycles, household appliances, containers and other production plants of the coating production line; petroleum, chemical, rubber, paint, paint, shoes, adhesive, plastic products, printing iron canning, printing ink, cables and enameled wire and other production lines of the exhaust gas treatment, especially for the need for heat recovery of the enterprise or the drying line of the exhaust gas treatment, can be recycled for the drying line of the energy, thereby achieving the purpose of saving energy. It can recycle energy for the drying line, thus achieving the purpose of saving energy. The types of organic substances that can be treated include benzene, ketones, esters, phenols, aldehydes, alcohols, ethers and hydrocarbons, etc.
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