CO catalytic combustion equipment refers to a device or equipment that burns under the action of a catalyst. The working principle of CO catalytic combustion equipment is to use a catalyst to conduct flameless combustion of exhaust gas at a lower ignition temperature, decomposing the exhaust gas into carbon dioxide and water vapor.
The electrical control system of CO catalytic combustion equipment consists of PLC controller, text display, frequency converter, igniter, ultraviolet sensor, thermocouple and other electronic control equipment, as well as a fan. In addition, the ratio of gas to air is regulated by a zero pressure valve.
Combustible materials burn under the action of catalysts. Compared with direct combustion, CO catalytic combustion equipment has lower temperature and combustion efficiency. The catalyst used in CO catalytic combustion equipment is a substance composed of precious metals and metal oxides. For example, catalytic gas stoves loaded with Pd or rare earth compounds for household use can reduce the CO content in exhaust gas and improve thermal efficiency. The alumina catalyst loaded with 0.2% Pt can burn and deodorize most compounds to a chemical shift of σ=1 or below at 500 ℃.
The CO catalytic combustion equipment is flameless combustion, making it suitable for high demand applications such as fuel cells using H2 and O2 as raw materials, and pocket furnaces using gasoline or alcohol as raw materials (with Pt impregnated asbestos catalyst). The smoke of NOx in chemical factories can be fueled into the smoke and converted into N2 gas through supported platinum and palladium catalysts and CO catalytic combustion equipment. The combustion method involves using appropriate catalysts to decompose and oxidize combustible substances in the gas at lower temperatures.
Composition and Control of CO Catalytic Combustion Equipment System
1. Catalytic combustion system
It mainly consists of a catalytic combustion bed (consisting of an electric heating chamber, a catalytic chamber, and a heat exchanger), a flame arrester, a temperature detector, corresponding electric valves, and insulation pipelines. The main function is to use the electric heater in the catalytic combustion bed to heat the waste gas generated by the production line, so that the useful waste gas is converted into CO2 and H2O at around 280-300 ℃ under the action of the catalyst and releases a large amount of heat. Heat is reused through a heat exchanger.
2. Control system
Mainly composed of PLC control cabinet, temperature display instrument, electric valve actuator, and panel simulation flowchart, the functions are:
Control the opening and closing of valves in the pipeline during the work process. According to the requirements of the process conditions, control the start and stop of the electric heater, and control and indicate the heating temperature, reaction temperature, gas flow temperature, and gas flow outlet temperature of the catalytic bed. Alarm and automatic shutdown of abnormal situations during equipment operation. Signal exchange with the overall control system to achieve interactive connection.
Applicable occasions for CO catalytic combustion equipment
This process and equipment can be widely used for the purification treatment of low concentration useful waste gases generated in industries such as petroleum, chemical, rubber, paint, coating, furniture, home appliances, printing, etc. The types of useful substances that can be treated include benzene, ketones, esters, alcohols, ethers, and alkanes.