RTO incinerator
Release Date:2023-11-15 Number of views:632
RTO incinerator
RTO incinerator, also known as RTO incinerator, regenerative incinerator, is a very mature, stable and effective organic waste gas treatment equipment. The advanced heat exchange technology and new honeycomb ceramic heat storage material are adopted, and the efficient heat exchange system ensures the effective recovery of oxidation decomposition heat. The heat recovery rate can be over 95% , the purification rate can be over 99% , the operation cost is low, it can deal with the low concentration waste gas in the large air volume and so on, greatly reduce the cost of production and operation. In the field of organic waste gas purification has great technical advantages.
Working Principle of RTO incinerator:
The basic principle is that VOC and O2 react at high temperature (800-850 ° C) to produce CO2 and H2O, and the heat generated by combustion is recycled for secondary combustion, which is both energy saving and environmental protection.
The volatile organic waste gas is pushed through the system fan or inhaled into the RTO intake manifold, and the on-off valve leads the gas into the regenerator. The gas is preheated to the combustor by the ceramic regenerator, and the gas is preheated to the combustor by the ceramic regenerator, the heat is left inside so that the heat of the regenerator is heated to the outlet, where it is heated. The purified exhaust gas is cooled so that the outlet temperature is slightly above the RTO inlet temperature, normally not exceeding 50-70 °C.
RTO incinerator process:
1. After the exhaust gas is collected, it is connected to a dry-type filter, which consists of a pre-treatment filter at the air inlet of the workshop and a four-stage filter in front of the runner to remove particles and paint mist from the exhaust gas.
2. After pretreatment, the waste gas enters into the hydrophobic zeolite concentrating runner, and the organic matter in the waste gas is effectively adsorbed in the zeolite molecular sieve runner to remove the target.
3. The clean gas, which is adsorbed by zeolite Volatile organic compound, is discharged directly into the atmosphere through the chimney.
4.The rotating wheel continuously rotates at a speed of 1-6 rpm while transferring the adsorbed Volatile organic compound to the desorption zone.
5. In the desorption zone, a small stream of heated gas is used to desorb the Volatile organic compound.
6. After desorption, the zeolite wheel rotates to the adsorption region and continuously adsorbs volatile organic gases.
7. After desorption, the concentrated organic waste gas is sent to the incinerator for combustion and conversion into water and carbon dioxide emission to the atmosphere.
8. The heat generated by combustion is used to preheat the desorption gas by heat exchange to achieve energy saving.
Process design of RTO incinerator system
RTO incinerator consists of regenerator, combustion chamber, reversing valve and control system. The process design of the main system includes: the selection of Regenerator Bed, the selection of regenerator material and type, the calculation of regenerator volume, and the determination of inlet gas velocity of empty tower; Combustion temperature of combustor, residence time of flue gas, selection of burner, Valve switching time, selection and quantity calculation of insulation Refractory, pre-treatment measures and safety measures, etc.
1. Overall process system requirements: system design pressure drop below 3000PA. The internal thermal insulation of the regenerative combustion device should be carried out as a whole, and the external surface temperature should not be higher than 60 ° C -LRB-except for some hot spots) . When the ambient temperature is low and the humidity is high, the anti-condensation measures such as heat preservation and tracing are adopted.
2. Regenerator: Regenerator is the space for heat exchange in the incinerator. Its structure and size are determined by heat recovery efficiency, regenerator performance and system pressure drop.
Selection of combustion process and regenerator number for RTO incinerator
Regenerative combustion technology can be divided into fixed and rotary regenerative combustion. The fixed regenerative combustion process has two, three and five chambers. In theory, the more the number of regenerator, the higher the purification efficiency. The rotating RTO device has rotating cylinder type, disc type and rotating valve type. The structure of the rotating RTO is the same as the fixed type except the driving area and the distributing area. In general, the combustion process of three-chamber fixed regenerative combustion process is considered more, the limited space can be considered when the rotating valve-type combustion process.
The heat recovery efficiency of regenerator requires that the heat recovery efficiency of regenerator should not be less than 95% . The heat recovery efficiency is a simple calculation method to deal with the heat balance of exhaust gas. When the inlet temperature is 30 ° C, the exhaust temperature is 60 ° C, and the combustion chamber temperature is 800 ° C, the heat recovery efficiency is 96.1% , (800-60)/(800-30) = 96.1% .
Basic requirements for Regenerator of RTO incinerator
1. The specific heat capacity is required not less than 750J/(kg · K) , with high specific gravity.
2. There is enough gas flow cross-sectional area, so that the gas distribution uniformity, low resistance.
3. High temperature resistance. The operating temperature of RTO equipment is generally 750-950 ° C, so it is necessary to choose materials with the temperature of 1250 ° C or above as the regenerator, and the regular materials such as honeycomb ceramics and composite ceramics are preferred.
4.Good thermal shock resistance. The high temperature impact that it can withstand in a short time should be above 1250 ° C, and its service life should not be less than 40000h.
5. At high temperature, it has enough mechanical strength, high temperature oxidation resistance and chemical corrosion resistance.
6. The price should be as low as possible.
Material and type selection of regenerator for RTO incinerator
At present, the ceramic raw materials used in RTO combustion equipment mainly include clay, corundum, mullite, zircon, aluminum titanate and cordierite, etc. . In the Regenerator of RTO, there are two main types of regenerator fillers: regular packing (such as honeycomb packing and plate corrugated packing) and bulk packing (granular packing, such as moment saddle ring) .
Insulation Refractory
It requires light weight, low thermal conductivity (less than 0.03 w/(m · K) at room temperature, good thermal shock resistance and strong chemical stability. In general, the thermal insulation of the combustion chamber and Regenerator can be made of refractory aluminum silicate fiber, which can withstand heat up to 1200 ° C and has a pile weight of 220 kg/m3. When laying, the thickness of the upper part of the combustion chamber and Regenerator is ≤225mm, and the thickness of the inlet and outlet air zone of the regenerator is ≤120mm. The insulation layer is generally arranged in three layers, including two layers of aluminum silicate fiber mat and one layer of aluminum silicate fiber module. A heat-resistant steel frame is arranged in the aluminum silicate fiber module and is fixed on the device shell by an anchor.
Post-processing requirements
The selective denitrification process is adopted for post-treatment when the flue gas nitrogen oxide emissions exceed the standard due to the treatment of nitrogen-containing organic compounds. When the organic matter containing sulfur or halogen is treated to produce sulfur dioxide and hydrogen halide, the post-treatment process such as absorption is adopted.
Requirements for safety measures
1. When the concentration of exhaust gas fluctuates greatly, dilution and buffer are adopted at the front end.
2.Fire arresters or fire dampers shall be installed in the piping system between the RTO unit and the main production unit. When the air inlet and exhaust pipes are made of metal material, measures such as flanged connection and system grounding should be taken to prevent static electricity from producing and accumulating.
3. Should have overheat protection function, thermal insulation design in line with the relevant provisions of SGBZ-0805.
4. The fuel supply system is equipped with high and low pressure protection and leakage alarm device, and safe and reliable flame control system, temperature monitoring system, pressure control system, etc. . The ignition operation of burners shall comply with the relevant provisions of GB19839.
5. The explosion-proof and pressure-relief design of pipeline system and regenerative combustion device shall comply with the relevant regulations of GB50160. The Compressed air system has low-voltage protection and alarms. Fans, motors and electrical instruments placed in the field and other equipment should be explosion-proof, grade should not be lower than the site level.
6. With short circuit protection, grounding resistance should be less than 4 ω. Install lightning arrester according to GB50057.
The process design of RTO incinerators for Volatile organic compound waste gas treatment focuses on the selection of materials and types of regenerator to ensure heat recovery efficiency and operational stability; The type selection of incineration process should be economical, feasible and in line with the actual conditions of the enterprise, and the appropriate combustion temperature and supporting facilities should be selected according to the specific conditions of the exhaust gas.
RTO incinerator
RTO incinerator, also known as RTO incinerator, regenerative incinerator, is a very mature, stable and effective organic waste gas treatment equipment. The advanced heat exchange technology and new honeycomb ceramic heat storage material are adopted, and the efficient heat exchange system ensures the effective recovery of oxidation decomposition heat. The heat recovery rate can be over 95% , the purification rate can be over 99% , the operation cost is low, it can deal with the low concentration waste gas in the large air volume and so on, greatly reduce the cost of production and operation. In the field of organic waste gas purification has great technical advantages.
Working Principle of RTO incinerator:
The basic principle is that VOC and O2 react at high temperature (800-850 ° C) to produce CO2 and H2O, and the heat generated by combustion is recycled for secondary combustion, which is both energy saving and environmental protection.
The volatile organic waste gas is pushed through the system fan or inhaled into the RTO intake manifold, and the on-off valve leads the gas into the regenerator. The gas is preheated to the combustor by the ceramic regenerator, and the gas is preheated to the combustor by the ceramic regenerator, the heat is left inside so that the heat of the regenerator is heated to the outlet, where it is heated. The purified exhaust gas is cooled so that the outlet temperature is slightly above the RTO inlet temperature, normally not exceeding 50-70 °C.
RTO incinerator process:
1. After the exhaust gas is collected, it is connected to a dry-type filter, which consists of a pre-treatment filter at the air inlet of the workshop and a four-stage filter in front of the runner to remove particles and paint mist from the exhaust gas.
2. After pretreatment, the waste gas enters into the hydrophobic zeolite concentrating runner, and the organic matter in the waste gas is effectively adsorbed in the zeolite molecular sieve runner to remove the target.
3. The clean gas, which is adsorbed by zeolite Volatile organic compound, is discharged directly into the atmosphere through the chimney.
4.The rotating wheel continuously rotates at a speed of 1-6 rpm while transferring the adsorbed Volatile organic compound to the desorption zone.
5. In the desorption zone, a small stream of heated gas is used to desorb the Volatile organic compound.
6. After desorption, the zeolite wheel rotates to the adsorption region and continuously adsorbs volatile organic gases.
7. After desorption, the concentrated organic waste gas is sent to the incinerator for combustion and conversion into water and carbon dioxide emission to the atmosphere.
8. The heat generated by combustion is used to preheat the desorption gas by heat exchange to achieve energy saving.
Process design of RTO incinerator system
RTO incinerator consists of regenerator, combustion chamber, reversing valve and control system. The process design of the main system includes: the selection of Regenerator Bed, the selection of regenerator material and type, the calculation of regenerator volume, and the determination of inlet gas velocity of empty tower; Combustion temperature of combustor, residence time of flue gas, selection of burner, Valve switching time, selection and quantity calculation of insulation Refractory, pre-treatment measures and safety measures, etc.
1. Overall process system requirements: system design pressure drop below 3000PA. The internal thermal insulation of the regenerative combustion device should be carried out as a whole, and the external surface temperature should not be higher than 60 ° C -LRB-except for some hot spots) . When the ambient temperature is low and the humidity is high, the anti-condensation measures such as heat preservation and tracing are adopted.
2. Regenerator: Regenerator is the space for heat exchange in the incinerator. Its structure and size are determined by heat recovery efficiency, regenerator performance and system pressure drop.
Selection of combustion process and regenerator number for RTO incinerator
Regenerative combustion technology can be divided into fixed and rotary regenerative combustion. The fixed regenerative combustion process has two, three and five chambers. In theory, the more the number of regenerator, the higher the purification efficiency. The rotating RTO device has rotating cylinder type, disc type and rotating valve type. The structure of the rotating RTO is the same as the fixed type except the driving area and the distributing area. In general, the combustion process of three-chamber fixed regenerative combustion process is considered more, the limited space can be considered when the rotating valve-type combustion process.
The heat recovery efficiency of regenerator requires that the heat recovery efficiency of regenerator should not be less than 95% . The heat recovery efficiency is a simple calculation method to deal with the heat balance of exhaust gas. When the inlet temperature is 30 ° C, the exhaust temperature is 60 ° C, and the combustion chamber temperature is 800 ° C, the heat recovery efficiency is 96.1% , (800-60)/(800-30) = 96.1% .
Basic requirements for Regenerator of RTO incinerator
1. The specific heat capacity is required not less than 750J/(kg · K) , with high specific gravity.
2. There is enough gas flow cross-sectional area, so that the gas distribution uniformity, low resistance.
3. High temperature resistance. The operating temperature of RTO equipment is generally 750-950 ° C, so it is necessary to choose materials with the temperature of 1250 ° C or above as the regenerator, and the regular materials such as honeycomb ceramics and composite ceramics are preferred.
4.Good thermal shock resistance. The high temperature impact that it can withstand in a short time should be above 1250 ° C, and its service life should not be less than 40000h.
5. At high temperature, it has enough mechanical strength, high temperature oxidation resistance and chemical corrosion resistance.
6. The price should be as low as possible.
Material and type selection of regenerator for RTO incinerator
At present, the ceramic raw materials used in RTO combustion equipment mainly include clay, corundum, mullite, zircon, aluminum titanate and cordierite, etc. . In the Regenerator of RTO, there are two main types of regenerator fillers: regular packing (such as honeycomb packing and plate corrugated packing) and bulk packing (granular packing, such as moment saddle ring) .
Insulation Refractory
It requires light weight, low thermal conductivity (less than 0.03 w/(m · K) at room temperature, good thermal shock resistance and strong chemical stability. In general, the thermal insulation of the combustion chamber and Regenerator can be made of refractory aluminum silicate fiber, which can withstand heat up to 1200 ° C and has a pile weight of 220 kg/m3. When laying, the thickness of the upper part of the combustion chamber and Regenerator is ≤225mm, and the thickness of the inlet and outlet air zone of the regenerator is ≤120mm. The insulation layer is generally arranged in three layers, including two layers of aluminum silicate fiber mat and one layer of aluminum silicate fiber module. A heat-resistant steel frame is arranged in the aluminum silicate fiber module and is fixed on the device shell by an anchor.
Post-processing requirements
The selective denitrification process is adopted for post-treatment when the flue gas nitrogen oxide emissions exceed the standard due to the treatment of nitrogen-containing organic compounds. When the organic matter containing sulfur or halogen is treated to produce sulfur dioxide and hydrogen halide, the post-treatment process such as absorption is adopted.
Requirements for safety measures
1. When the concentration of exhaust gas fluctuates greatly, dilution and buffer are adopted at the front end.
2.Fire arresters or fire dampers shall be installed in the piping system between the RTO unit and the main production unit. When the air inlet and exhaust pipes are made of metal material, measures such as flanged connection and system grounding should be taken to prevent static electricity from producing and accumulating.
3. Should have overheat protection function, thermal insulation design in line with the relevant provisions of SGBZ-0805.
4. The fuel supply system is equipped with high and low pressure protection and leakage alarm device, and safe and reliable flame control system, temperature monitoring system, pressure control system, etc. . The ignition operation of burners shall comply with the relevant provisions of GB19839.
5. The explosion-proof and pressure-relief design of pipeline system and regenerative combustion device shall comply with the relevant regulations of GB50160. The Compressed air system has low-voltage protection and alarms. Fans, motors and electrical instruments placed in the field and other equipment should be explosion-proof, grade should not be lower than the site level.
6. With short circuit protection, grounding resistance should be less than 4 ω. Install lightning arrester according to GB50057.
The process design of RTO incinerators for Volatile organic compound waste gas treatment focuses on the selection of materials and types of regenerator to ensure heat recovery efficiency and operational stability; The type selection of incineration process should be economical, feasible and in line with the actual conditions of the enterprise, and the appropriate combustion temperature and supporting facilities should be selected according to the specific conditions of the exhaust gas.
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