RTO waste gas treatment principle, RTO waste gas treatment equipment

The combustible exhaust gas is oxidized to the corresponding oxide and water at high temperatures, thus purifying the exhaust gas.

The principle of RTO treatment of organic waste gas is to oxidize the combustible waste gas into the corresponding oxide and water at high temperature, so as to purify the waste gas, and improve the heat released when the waste gas is decomposed, the exhaust gas decomposition efficiency is more than 99%, and the thermal efficiency is more than 95%.

The main structure of the RTO is composed of a combustion chamber, a ceramic packed bed and a switching valve. According to the actual needs of customers, choose different thermal energy ** methods and switching valve methods.

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RTO regenerative incineration system is mainly used in the case of low concentration of organic waste gas and large amount of waste gas, and is also very suitable when the organic waste gas contains corrosive and toxic substances to the catalyst and needs a higher temperature to oxidize some odors.

RTO regenerative incinerator principleThe regenerative thermal oxidizer uses the thermal oxidation method to treat medium and low concentrations of organic waste gas, and uses the ceramic regenerative bed heat exchanger to exchange heat. It is composed of a ceramic regenerative bed, an automatic control valve, a combustion chamber and a control system. Its main features are:

The automatic control valve at the bottom of the regenerative bed is connected with the air intake main pipe and the exhaust main pipe respectively, and the regenerative bed is alternated through the reversing valve, and the heat of the high-temperature gas coming out of the combustion chamber is stored, and the organic waste gas entering the regenerative bed is preheated; Ceramic heat storage materials are used to absorb and release heat; The organic exhaust gas, preheated to a certain temperature (760), undergoes an oxidation reaction in the combustion chamber to generate carbon dioxide and water, which is purified. A typical three-bed RTO main unit consists of a combustion chamber, three ceramic packed beds, piping and nine wind direction switching valves, a fresh air valve, and an exhaust gas main control valve. The regenerative ceramic packed bed heat exchanger in the device can make the thermal energy get the maximum **, and the heat ** rate is greater than 95%; No or very little fuel is used to dispose of VOCs.

Schematic diagram of RTO regenerative incinerator

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Regenerative high-temperature incinerator RTO is a commonly used waste gas treatment equipment, which mainly changes the chemical composition of the waste gas by heating and combustion, so as to achieve the purpose of purifying the waste gas.

The exhaust gas first enters the preheater, and through heat exchange with the discharged purified gas, the exhaust gas temperature rises, thereby improving the combustion efficiency. The exhaust gas code nucleus then enters the combustion chamber for combustion, and the heat generated by the combustion is used to heat the preheater and purify the gas. Finally, the exhaust gases are cooled by another set of preheaters and discharged into the atmosphere.

Regenerative high-temperature incinerator RTO is mainly suitable for waste gases that require high-temperature combustion treatment, such as organic waste gas and acid waste gas, and can also treat other types of waste gases. In the process of use, it is necessary to select the appropriate equipment combination and operating parameters according to the composition and nature of different exhaust gases to ensure the treatment effect and the stable operation of the equipment.

Advantages of RTO regenerative exhaust gas filament device:

1. Almost all exhaust gases containing organic compounds can be treated, and organic waste gases with large air volume and low concentration (relative to direct-fired incinerators) can be treated.

2. RTO waste gas treatment equipment can adapt to the changes and fluctuations of the composition and concentration of VOCs in the exhaust gas.

3. It is not sensitive to a small amount of dust and solid particles in the exhaust gas.

RTO refers to regenerative thermal oxidizer technology, that is, "regenerative thermal oxidizer".

RCO refers to regenerative catalytic oxidation oxidition.

The two work on different principles.

RTO regenerative thermal oxidation is a new unsteady state heat transfer method, the principle is to heat the organic waste gas to more than 760, so that the VOC in the waste gas oxidizes and decomposes into CO2 and H2O. The high-temperature gas produced by oxidation flows through a special ceramic heat storage body, which increases the temperature of the ceramic body, thereby "heat storage", which is used to preheat the organic waste gas entering later, saving the fuel consumption of the exhaust gas heating. RTO technology is suitable for treating low to medium concentration (100-3500mg m3) exhaust gas, and the decomposition efficiency is high, generally 95%-99%.

The principle of RCO regenerative catalytic combustion method is as follows: firstly, the adsorption of VOC molecules by the catalyst increases the concentration of reactants, and secondly, the activation energy of the reaction is reduced in the catalytic oxidation stage and the reaction rate is increased. With the help of catalyst, the organic waste gas can be decomposed into CO2 and H2O at a lower ignition temperature, and a large amount of heat is released, and the energy consumption is small, and in some cases there is no need for external heating after reaching the ignition temperature, and the reaction temperature is 250-400.

The difference between RTO (regenerative thermal incinerator) and RCO (catalytic combustion equipment) lies in the T and C in the middle of the letters, T is synonymous with heat storage, and C is synonymous with catalysis, relatively speaking. The catalytic effect of RTO is the best, but the cost is very expensive, and the main requirements are for the material of the furnace body. The cost of RCO is relatively low, and the main expenditure is on the purchase of catalysts.

Exhaust gas treatment requires a series of procedures to rco, which are different with different treatment methods.

RTO technology and RCO technology are VOCs (volatile organic compounds) treatment technologies, which are mature technologies with wide application, good treatment effect, stable operation and low cost.

1. The principle is different

RTO refers to regenerative thermal oxidizer technology, and the English name is "Regenerative Thermal Oxidizer". RTO regenerative thermal oxidation** heat adopts a new unsteady state heat transfer method, the principle is to heat the organic waste gas to more than 760 to oxidize and decompose the VOC in the exhaust gas into CO2 and H2O. The high-temperature gas produced by oxidation flows through a special ceramic heat storage body, which heats up the ceramic body and "stores heat", which is used to preheat the organic waste gas that enters later, thereby saving the fuel consumption of the exhaust gas heating.

RTO technology is suitable for treating low to medium concentration (100-3500mg M3) exhaust gas, with a decomposition efficiency of 95%-99%.

RCO refers to regenerative catalytic oxidation oxidition. The principle of RCO regenerative catalytic combustion method is as follows: the first step is the adsorption of VOC molecules by the catalyst to increase the concentration of reactants, and the second step is to reduce the activation energy of the reaction and increase the reaction rate in the catalytic oxidation stage.

With the help of catalyst, the organic waste gas can be made at a lower ignition temperature, anaerobic combustion occurs, decomposes into CO2 and H2O to release a large amount of heat, compared with direct combustion, has the characteristics of low ignition temperature and low energy consumption, in some cases does not need external heating after reaching the ignition temperature, and the reaction temperature is 250-400.

2. RTO does not contain catalysts, and RCOs contain catalysts;

3. The operating temperature of RTO is above 760, and the operating temperature of RCO is 250 400;

4. RTO may produce NOx secondary pollutants, but RCO will not;

5. The operating temperature of RCO is low, and the operating cost is lower than that of RTO.

RTO process principle.

RTO (Regenerative Thermal Oxidizer) is mainly composed of a regenerative chamber, a combustion chamber, and an airflow switching valve. The regenerator chamber is filled with ceramic regenerators, and the combustion chamber is equipped with a burner with proportional adjustment. There are 6 states of pre-purging, ignition, heating, incineration, heat preservation, and post-purging shutdown.

RCO process principle.

The structure of the RCO (Regenerative Catalytic Oxidizer) is similar to that of the RTO, which consists of a fixed bed, a combustion chamber and a valve system. The same flow direction transformation operation is used, which differs from the RTO in that there is an additional catalytic bed on top of the regenerative bed of the RCO. The regenerator chamber is filled with ceramic regenerators and catalysts, and the combustion chamber is equipped with a burner with proportional adjustment. There are 6 states of pre-purging, ignition, heating, incineration, heat preservation, and post-purging shutdown.

RCO technical features:

1. High-concentration waste gas treatment realizes self-heating combustion, low operating cost and reasonable cost performance.

2. High purification efficiency, VOCs removal rate of 95%, three-chamber RTO up to 99%.

3. The ceramic heat storage body is used as the heat energy**, and the preheating and heat storage are operated alternately, with a thermal efficiency of 95%.

4. The steel structure of the furnace body is reliable, the insulation layer is thick, the operation is safe and reliable, and the stability is high.

5. PLC programmable automatic control, high degree of automation.

Regenerative Thermal Oxidizers (RTOs).

The principle is to oxidize the organic matter (VOCs) in the exhaust gas into the corresponding carbon dioxide and water at high temperature, so as to purify the exhaust gas, and the heat released when the exhaust gas is decomposed, the three-chamber RTO exhaust gas decomposition efficiency reaches more than 99%, and the thermal efficiency reaches more than 95%. The main structure of the RTO is composed of a combustion chamber, a regenerative chamber and a switching valve.

The high-temperature gas produced by oxidation flows through a special ceramic heat storage body, which heats up the ceramic body and "stores heat", which is used to preheat the organic waste gas that enters later. This saves fuel consumption for exhaust gas heating. The ceramic regenerator should be divided into two (including two) or more, and each regenerator should go through the procedures of heat storage, heat release, cleaning and so on, and work continuously over and over again.

After the regenerator is "exothermic", an appropriate amount of clean air should be introduced to clean the regenerator (to ensure that the VOC removal rate is above 98%), and only after the cleaning is completed can the "heat storage" procedure be entered. Otherwise, the residual VOCs are emitted to the chimney with the flue gas, thus reducing the treatment efficiency.

Regenerative catalyst incinerator RCO

regenerative catalytic oxidation)

The exhaust gas containing VOCs from the process enters the double-tank RCO, and the three-way switching damper introduces the exhaust gas into the RCO's regenerative tank and preheats the exhaust gas, and the polluted exhaust gas is gradually heated by the regenerative ceramic block and enters the catalytic bed, and the VOCs are oxidized by catalyst decomposition and release heat energy into the ceramic block in the second regenerator to reduce the consumption of auxiliary fuel. The ceramsite is heated, and the clean gas after combustion oxidation gradually lowers the temperature, so that the outlet temperature is slightly higher than the RCO inlet temperature. Three-way switching, damper switching, changing the RCO outlet inlet temperature.

If the concentration of VOCs is high enough and the heat emitted is sufficient, the RCO does not need fuel. For example, at a 95% RCO thermal** efficiency, the RCO outlet is only 25% higher than the inlet temperature.

RTO and RCO are the abbreviations of regenerative incinerator and catalytic oxidizer respectively, under normal circumstances, RTO is used to treat organic volatile gases with a certain calorific value and large air volume, and RCO is used to treat organic volatile gases with small air volume and difficult to oxidize and decompose.

From the point of view of energy saving, the outlet temperature of CO and DFTO is too high and the energy consumption is high, so it is not recommended. Unless the VOCs concentration can reach self-sustaining combustion.

RTOs and RCOs are relatively widely used and have low operating costs. RCO involves catalyst replacement, which is slightly more expensive to maintain later. If the budget is sufficient, RTO should be prioritized.

Catalytic combustion RCO, high-concentration waste gas treatment RTO: It is a high-efficiency organic waste gas treatment equipment. Compared with the traditional catalytic combustion and direct-fired thermal oxidation furnace (TO), it has the characteristics of high thermal efficiency (95%), low operating cost, and can handle large air volume and low concentration exhaust gas.

RTO Exhaust Gas Treatment PrincipleThe working principle of RTO: organic matter (VOCs) reacts with oxygen at a certain temperature to generate CO2 and H2O, and releases a certain heat oxidation reaction process, RTO is to heat the exhaust gas to more than 700, so that the VOC in the exhaust gas oxidizes and decomposes into CO2 and H2O, and the high-temperature gas produced by oxidation flows through the ceramic heat storage body, so that it heats up "heat storage", and is used to preheat the organic waste gas that enters the subsequent entry, so as to save the waste gas heating fuel consumption treatment technology.

Advantages of RTO exhaust gas treatmentTechnical. It has a certain environmental protection effect.

The equipment has a high safety factor during use.

Disadvantages of RTO exhaust gas treatmentThe unit is heavy because of the ceramic heat storage body.

The device is large and can only be placed outdoors.

It is required to operate as continuously as possible.

The one-time investment fee is relatively high.

It is not possible to thoroughly purify and treat organic matter containing sulfur, nitrogen and halogen.

What are the safety hazards of RTO exhaust gas treatment? In order to realize the intrinsic safety of RT0 device, the physical and chemical properties and hazard characteristics of the treated waste gas should be fully considered in the design process, and the safety risks arising from the collection, transportation and disposal process, as well as the safety risks arising from the selection and material of safety facilities such as burners, fans, pipelines, safety valves and rupture discs of RTO devices.