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Regenerative Incinerator / Regenerative Thermal Oxidizer (RTO)
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 Regenerative thermal oxidizer (RTO) includes an intake control equipment, a heating control panel, and at least two thermal storages. The regenerator is insulated with materials such as gravel or ceramic. The gas through Bed A, made of high-heat storage material, can achieve a certain preheating effect, removes of the VOC through the heating zone. After the reaction of the heated gas, the other thermal bed (Bed B) heat will be passed to the lower temperature of the insulator. To simply put, the heat from the gas is been stored, and the gas is discharged at a lower temperature. Wait until the specific valve switching time, to deal with the gas is changed by the introduction of B bed for preheating, There is a switch valve to that then introduces gases to Bed B for preheating after the heat from the reaction that gas stored in Bed A, completing an operation cycle. Typical RTO components include exhaust fans, burners (or electric), heat exchangers (common for two-bed RTOs), and flow controllers. First, the inflow of waste gas through the heated storage material is preheating from the exhaust gas, and then into the combustion chamber in an oxidized decomposition, treating high-temperature exhaust gas through the lower temperature of heat storage material B. The heat source is the combustion gas and is absorbed by the heat feed material. The temperature of heat storage material B is increased, and heat storage material A is cooled due to the low feed rate of the preheating temperature. After a certain period of time, the gas flow of the furnace is switched, and the gas is preheated into the exhaust gas by heat storage material B and gradually cools down. After the decomposition of the pollutants, the treated heat is heated by the heat storage material. Repeated operation removes contaminants. The description above shows that the RTO is efficient, and at the thermal storage capacity of heat storage material are closely related. The principle is to use the heat storage material fire resistance to accumulate the heat generated combustion after combustion. The common heat storage material is ceramic. Ceramic heat media (Fire Heat) with flame capture (Flame Arrester) and high heat capacity properties, can significantly accumulate heat and the release of heat. With the appropriate VOC inflow concentration and residence time, this can be achieved without a fuel source (Flameless Oxidation), which significantly reducing fuel costs and NOx generation.  Because the time of gas through the heat storage material is quite short, the heat transfer material heat transfer area and heat transfer efficiency are very important, the ceramic storage material is divided into two types, ball and honeycomb. Honeycomb-like heat transfer area of 5 times the spherical heat storage body and the pressure loss is only 1/4 of spherical heat storage body; in weight, honeycomb is 1/10 of spherical. In the practical design and application, it has its advantages. In the selection of materials, bluestone, mold stone, high-alumina, and other components of the ceramic material can be used. The following table shows the improvement of the RTO field. The table compares the differences between the direct combustion incineration and the improved RTO incineration prior to improvement and the temperature profile. It can be seen from the figure that the original design of the direct combustion technology, although the establishment has heat recovery equipment, the efficiency is not high. The furnace still needs a lot of auxiliary fuel for heating and destruction. After the improvement, the heat exchange efficiency of the heat storage material is remarkable. When it enters the high-temperature zone, the temperature can reach the spontaneous combustion temperature of the pollutant. In the case of stable operation, no additional auxiliary fuel is needed, and the heat recovery efficiency is improved. The advantages of the overall RTO are that the heat recovery efficiency is high (> 95%), the removal efficiency is good (> 98%), the operating cost is lower and the pollutant is effectively removed by 3% of the lower combustion limit. The disadvantages are that the equipment is large, the initial cost is high, and the pressure change in the direction of the incoming and outgoing flow may have an impact on the process. RTO field improvement case  |