Catalytic oxidation is a typical I solid phase catalytic reaction, the essence of which is reactive oxygen species involved in the depth of oxidation in the process of catalytic oxidation, the effect of catalyst is to reduce the activation energy, at the same time, the surface of the catalyst, with adsorption enrichment of the reactant molecules to the surface to improve the reaction rate, speed up the reaction with the aid of catalyst can make organic waste under the condition of low light-off temperature, flameless oxidation, and oxidation is decomposed into CO2 and H2O, release a large amount of heat energy at the same time, so as to remove the exhaust of harmful methodIts reaction process is: in the exhaust gas in the process of catalytic oxidation, flue gas pipelines by the fan into the heat exchanger, heat the gas to the light-off temperature catalytic oxidation need, to make it through the catalyst bed layer oxidation, due to the presence of catalysts, catalytic oxidation of the light-off temperature of about 250-300 oc, much lower than direct oxidation of oxidation temperature 650-800 oc so than direct oxidation method for low energy consumption.
工藝流程簡圖
System principle
Catalysis mechanism is a very complex problem, there is only do profile in a chemical reaction process, the addition of catalyst does not change the original chemical equilibrium, the only change is the speed of chemical reaction, the catalyst before and after the reaction itself does not change the nature of the catalyst is how to accelerate the reaction rate since reaction catalyst before and after the change, the catalyst is not participated in the reaction?In fact, the catalyst itself participates in the reaction, and it is because of its participation that the reaction changes the original path, reduces the activation energy of the reaction, and thus speeds up the reaction. For example, reaction A+B and C are bound by intermediate activity
A + B - [AB] - C
The reaction is slow.When catalyst K is added, the reaction is carried out in an easy way:
A + B + 2 K - [AK] + [BK] - [CK] - > C + 2 K + K
The transition from [AB] to C is no longer needed, speeding up the reaction, while the catalyst does not change its properties.
Combustion process: the catalytic combustion process is carried out in the catalytic combustion device.The organic waste gas is preheated to 200 ~ 400oC through the heat exchanger before entering the combustion chamber.
When passing through the catalyst bed, hydrocarbon molecules and oxygen molecules in the mixture are adsorbed on the surface of the catalyst and activated respectively.Because surface adsorption reduces the activation energy of the reaction, hydrocarbons and oxygen molecules oxidize rapidly at lower temperatures, producing carbon dioxide and water.
Catalyst: the key of catalytic combustion reaction is to choose the right catalyst.The requirements for the catalyst are: high activity in particular to low temperature activity good so as to start at the lowest possible temperature reinterest combustion reaction is exothermic reaction, release a lot of heat can make the surface of the catalyst to reach the high temperature of 500~1000oC, and the catalyst is easy to melt and reduce the activity, so the catalyst is required to be able to withstand high temperature.
Catalysts for catalytic combustion can be divided into: (1) precious metals: platinum, palladium, ruthenium and so on.Precious metal catalyst has high oxidation activity and easy recovery, but it is still the main catalyst used in the world.(2) non-precious metals: mainly transition group elements of oxidation 1) and nickel oxide (NiO), etc.The single component oxide has poor heat resistance and low activity, which limits its application.The following 3:2) complexes, ferric oxide - chromium oxide complex, copper oxide - chromium oxide complex, oxides can improve some catalytic properties, but the oxidation activity is still not as good as precious metals.In addition, there is also the catalytic combustion of metals including F sulfur-containing carbon and chlorine compounds, which are easy to decompose at a high temperature of 300-400oc.
General are painted on the carrier, so its shape also varies according to the carrier.Y - Al carrier have?O?Super sphere, cylinder and a variety of different bodies, useful surface covering active alumina film porous ceramic honeycomb body, also useful heat resistant alloy wire support bulk ball metal corrugated plate.The carrier can reduce the amount of catalyst and play a supporting role.It should have large specific surface area, high temperature resistance, high mechanical strength and low fluid resistance.
range of application
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