A device for improving the heat storage capacity of an RTO plant
By adding saddle rings and honeycomb ceramic bodies to the RTO equipment, the airflow direction is changed, which solves the problem of insufficient heat exchange between the exhaust gas and the heat storage body, improves the heat transfer efficiency, achieves sufficient preheating and purification of the exhaust gas, and reduces fuel consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU QIFENG ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-06-02
AI Technical Summary
In existing RTO equipment, the heat exchange between the exhaust gas and the heat storage medium is insufficient, resulting in insufficient heating of the exhaust gas, which cannot be completely oxidized and decomposed, affecting the purification effect and increasing energy consumption.
By adding saddle rings and honeycomb ceramic bodies to RTO equipment, the airflow direction is changed, increasing the contact area between the gas and the heat storage body and the heat exchange time, thereby improving the heat transfer efficiency.
This achieves sufficient preheating of exhaust gas, reduces fuel consumption, improves the heat storage capacity and purification efficiency of RTO equipment, and lowers operating costs.
Smart Images
Figure CN224316191U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of RTO equipment technology, and in particular to a device for improving the heat storage capacity of RTO equipment. Background Technology
[0002] Against the backdrop of increasingly stringent environmental protection requirements, regenerative thermal oxidizers (RTOs) have become widely used as key energy-saving and environmentally friendly devices for treating medium- to high-concentration organic waste gases. In numerous industries such as petroleum, chemical, rubber, paint, coating, furniture, printed tin cans, and printing, RTO equipment plays a crucial role in purifying organic waste gases.
[0003] The working principle of RTO (Regenerative Thermal Oxidation) equipment is based on the thermal oxidation reaction of combustible organic waste gas at a high temperature of 780-1100℃, which transforms it into carbon dioxide and water. If the organic matter contains other elements such as halogens, the oxidation products will also include substances such as hydrogen halides. The waste gas is first heated to near the thermal oxidation temperature by a heat storage medium, and then enters the combustion chamber for thermal oxidation. The temperature of the oxidized gas rises significantly, and the organic matter is basically converted into carbon dioxide and water. The purified gas then passes through a heat storage medium, and the temperature is reduced to meet emission standards before being discharged. In this process, different heat storage media work alternately over time, performing heat absorption and heat release operations respectively.
[0004] However, existing RTO (Regenerative Thermal Oxidizer) equipment has several shortcomings in terms of heat storage capacity. Some RTO devices fail to ensure sufficient contact and efficient heat exchange between the exhaust gas and the heat storage medium during heating, resulting in insufficient heating of the exhaust gas. Consequently, the exhaust gas cannot be completely oxidized and decomposed upon entering the combustion chamber, thus affecting the purification effect. Furthermore, lower heat exchange means that more energy needs to be consumed to raise the exhaust gas temperature, which undoubtedly increases operating costs. Therefore, a device to improve the heat storage capacity of RTO equipment is designed. Utility Model Content
[0005] This invention addresses the problem that existing RTO equipment cannot ensure sufficient contact between exhaust gas and the heat storage medium for efficient heat exchange. It provides a device to improve the heat storage capacity of RTO equipment. By adding a saddle ring and changing the airflow direction, the contact area between the gas and the heat storage medium, such as the saddle ring and the honeycomb ceramic body, is increased. This ensures sufficient heat exchange time between the gas and the heat storage medium, improves the efficiency of heat transfer, and ultimately enhances the heat storage capacity of the RTO equipment, effectively solving the problems mentioned in the background art.
[0006] The technical solution adopted by this utility model to solve the above problems is as follows:
[0007] A device for improving the heat storage capacity of an RTO (Regenerative Thermal Oxidizer) equipment includes multiple sets of steel frames and multiple sets of sheet metal. The steel frames and sheet metal are welded together to form the shell of the RTO equipment. The bottom of the shell has multiple openings, each equipped with a valve. The middle of the shell has multiple heat storage chambers corresponding to the openings, and the upper end of the shell also has an oxidation chamber. Each heat storage chamber is equipped with a heat storage material grid, and each heat storage material grid has a gas diversion structure. Each heat storage chamber is also equipped with a ceramic heat storage body. When exhaust gas enters the heat storage chamber from the openings, the gas diversion structure can disperse the gas into an irregular flow direction, allowing it to fully contact the ceramic heat storage body.
[0008] The steel frame is made of H-beams, and the distance between two adjacent H-beams is less than 1 meter.
[0009] The port includes a first port, a second port, and a third port, and the heat storage chamber includes a first heat storage chamber, a second heat storage chamber, and a third heat storage chamber. The first port, the second port, and the third port are respectively connected to the corresponding first heat storage chamber, second heat storage chamber, and third heat storage chamber.
[0010] The first, second, and third heat storage chambers are all connected to the oxidation chamber.
[0011] The heat storage material grid is a perforated grid with a metal mesh laid on it.
[0012] The gas diversion structure is a saddle ring.
[0013] The gas splitting structure is a Pall ring.
[0014] The inner walls of the heat storage chamber are all equipped with a heat insulation layer.
[0015] The housing is also equipped with an inspection window.
[0016] Compared with the prior art, this utility model has the following advantages:
[0017] During use, the control valves open the first and second ports. The organic waste gas to be treated enters the first heat storage chamber through the first port. The ceramic heat storage body in the first heat storage chamber stores the heat from the previous cycle. The ceramic heat storage body releases heat and cools down, while the organic waste gas absorbs heat and heats up. After leaving the first heat storage chamber, the waste gas enters the oxidation chamber at a higher temperature. At this time, the temperature of the waste gas depends on the volume of the ceramic body, the waste gas flow rate, and the geometric structure of the ceramic body. In the oxidation chamber, the organic waste gas is heated to the oxidation temperature by the burner, causing the VOC components in it to decompose into carbon dioxide and water. Since the waste gas has been preheated in the first heat storage chamber, the fuel consumption is greatly reduced. The oxidation chamber has two functions: first, to ensure that the waste gas can reach the set oxidation temperature; and second, to ensure that there is enough residence time for the VOCs in the waste gas to be fully oxidized.
[0018] The exhaust gas is burned in the oxidation chamber and becomes purified high-temperature gas before leaving the oxidation chamber and entering the second heat storage chamber. The ceramic heat storage body in the second heat storage chamber has been cooled in the previous cycle and is discharged after releasing heat and cooling down. The ceramic heat storage body in the second heat storage chamber absorbs a large amount of heat and heats up, which is used to heat the exhaust gas in the next cycle. The purified exhaust gas is discharged into the atmosphere through the chimney, while a small amount of purified gas is introduced to clean the third heat storage chamber.
[0019] After the cycle is completed, the intake and exhaust valves switch once to enter the next cycle. The exhaust gas enters from the second heat storage chamber and exits from the third heat storage chamber. After the switch, the first heat storage chamber is cleaned, and this process is repeated alternately.
[0020] After adding saddle rings to the heat storage material at the bottom of the heat storage chamber, the gas entering the heat storage chamber first passes through the scattered packing and then enters the honeycomb ceramic body, i.e. the ceramic heat storage body. After passing through the saddle rings, the gas flow direction is dispersed and presents an irregular flow direction, which plays a certain role in uniform airflow. The gas can pass through the honeycomb ceramic body evenly, and the gas cross-sectional velocity is uniform.
[0021] By adding a saddle ring to the heat storage material at the bottom of the heat storage chamber, the contact area between the gas and the heat storage body such as the saddle ring and the honeycomb ceramic body is increased by changing the airflow direction. This ensures the heat exchange time between the gas and the heat storage body, improves the efficiency of heat energy transfer, and ultimately enhances the heat storage capacity of the RTO equipment. Attached Figure Description
[0022] Figure 1 This is an isometric view of a device for improving the heat storage capacity of an RTO (Regenerative Thermal Oxidizer) device according to the present invention.
[0023] Figure 2 This is a cross-sectional view of a device for improving the heat storage capacity of an RTO (Regenerative Thermal Oxidizer) equipment according to the present invention.
[0024] Figure 3 This is a side sectional view of a device for improving the heat storage capacity of an RTO (Regenerative Thermal Oxidizer) device according to the present invention.
[0025] Numbers in the diagram: 1-First port, 2-Second port, 3-Third port, 4-First heat storage chamber, 5-Second heat storage chamber, 6-Third heat storage chamber, 7-Oxidation chamber, 8-Inspection window, 9-Heat storage grid, 10-Saddle ring, 11-Ceramic heat storage body, 12-Insulation layer. Detailed Implementation
[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0027] like Figures 1-3As shown, this utility model provides a device for improving the heat storage capacity of an RTO (Regenerative Thermal Oxidizer) device, comprising multiple sets of steel frames and multiple sets of sheet metal. The steel frames and sheet metal are welded together to form the shell of the RTO device. The bottom of the shell has multiple openings, each equipped with a valve. The middle of the shell has multiple heat storage chambers corresponding to the openings, and the upper end of the shell also has an oxidation chamber 7. Each heat storage chamber is equipped with a heat storage material grid 9, and each heat storage material grid 9 has a gas diversion structure. Each heat storage chamber is also equipped with a ceramic heat storage body 11. When the exhaust gas enters the heat storage chamber from the openings, the gas diversion structure can disperse the gas into an irregular flow direction, allowing it to fully contact the ceramic heat storage body 11.
[0028] like Figures 1-3 As shown, the RTO equipment shell is constructed by welding steel frame and sheet metal, which is existing technology and will not be described in detail here. The direction of waste gas flow can be controlled by multiple openings, so that the waste gas passes through the corresponding heat storage chamber to reach the oxidation chamber 7. The openings can be opened or closed by the valves. Each opening is connected to the corresponding heat storage chamber. The oxidation chamber 7 is used to treat organic waste gas, the heat storage material grid 9 is used to support the gas diversion structure, and the ceramic heat storage body 11 is used to exchange and store gas heat.
[0029] The working principle of RTO equipment is as follows: the organic waste gas is heated to above 760°C and the residence time is greater than 0.5 seconds, so that the VOCs in the waste gas are oxidized and decomposed into harmless carbon dioxide and water; the heat of the high-temperature gas during oxidation is stored in the heat storage body and used to preheat the newly entered organic waste gas, thereby saving the fuel consumption required for heating and reducing operating costs. This invention uses a three-chamber RTO equipment as an example to illustrate the working principle.
[0030] The control valves open the first port 1 and the second port 2. The organic waste gas to be treated enters the first heat storage chamber 4 through the first port 1. The ceramic heat storage body 11 in the first heat storage chamber 4 stores the heat from the previous cycle. The ceramic heat storage body 11 releases heat and cools down, while the organic waste gas absorbs heat and heats up. After leaving the first heat storage chamber 4, the waste gas enters the oxidation chamber 7 at a higher temperature. At this time, the temperature of the waste gas depends on the volume of the ceramic body, the flow rate of the waste gas, and the geometric structure of the ceramic body. In the oxidation chamber 7, the organic waste gas is heated to the oxidation temperature by the burner, causing the VOC components in it to decompose into carbon dioxide and water. Since the waste gas has been preheated in the first heat storage chamber 4, the fuel consumption is greatly reduced. The oxidation chamber 7 has two functions: first, to ensure that the waste gas can reach the set oxidation temperature; and second, to ensure that there is enough residence time for the VOCs in the waste gas to be fully oxidized.
[0031] The exhaust gas is burned in the oxidation chamber 7 and becomes purified high-temperature gas before leaving the oxidation chamber 7 and entering the second heat storage chamber 5. The ceramic heat storage body 11 in the second heat storage chamber 5 has been cooled in the previous cycle and is discharged after releasing heat and cooling down. The ceramic heat storage body in the second heat storage chamber 5 absorbs a large amount of heat and heats up, which is used to heat the exhaust gas in the next cycle. The purified exhaust gas is discharged into the atmosphere through the chimney, and at the same time a small stream of purified gas is introduced to clean the third heat storage chamber 6.
[0032] After the cycle is completed, the intake and exhaust valves switch once to enter the next cycle. The exhaust gas enters from the second heat storage chamber 5 and exits from the third heat storage chamber 6. After the switch, the first heat storage chamber is cleaned, and this process is repeated alternately.
[0033] The steel frame is made of H-beams, and the distance between two adjacent H-beams is less than 1 meter.
[0034] like Figure 1 As shown, the shell is generally made of 5mm Q235 carbon steel plate, with steel reinforcement ribs on the outer surface. H-beams are used, and the spacing between the steel ribs is no more than 1m, making the entire equipment structure sturdy. The outer surface of the sheet metal is flat, without defects such as pits or weld scars, and the shell is well sealed.
[0035] The openings include a first opening 1, a second opening 2, and a third opening 3. The heat storage chambers include a first heat storage chamber 4, a second heat storage chamber 5, and a third heat storage chamber 6. The first opening 1, the second opening 2, and the third opening 3 are respectively connected to the corresponding first heat storage chamber 4, second heat storage chamber 5, and third heat storage chamber 6.
[0036] like Figure 1 and Figure 2 As shown, the first port 1 is integrally connected to the first heat storage chamber 4, the second port 2 is integrally connected to the second heat storage chamber 5, and the third port 3 is integrally connected to the third heat storage chamber 6. The three ports and heat storage chambers are independent of each other and will not cause gas interaction.
[0037] The first heat storage chamber 4, the second heat storage chamber 5, and the third heat storage chamber 6 are all connected to the oxidation chamber 7.
[0038] like Figure 2 As shown, the heat storage chamber and the oxidation chamber 7 are connected, so that the gas in each heat storage chamber can enter and exit the oxidation chamber 7.
[0039] The heat storage material grid 9 is a perforated grid, and a metal mesh is laid on the perforated grid.
[0040] like Figure 3As shown, to ensure uniform stress on the bottom ceramic, an 80-120mm aperture grid is used. A diamond-shaped metal mesh with a spacing of 10-38mm is laid on the metal support grid. The spacing of the metal mesh depends on the actual size of the saddle ring to ensure that the saddle ring will not fall off the mesh. The bottom grid and metal mesh need to be flat, otherwise it will be impossible to install the honeycomb ceramic on top neatly.
[0041] The gas diversion structure is a saddle ring 10.
[0042] like Figure 3 As shown, the saddle ring 10 is used as a random packing material. Generally, a 1-inch or 1.5-inch saddle ring is preferred, with a packing thickness of 100-150mm. After adding the saddle ring 10 to the heat storage material at the bottom of the heat storage chamber, the gas entering the heat storage chamber first passes through the random packing material and then enters the honeycomb ceramic body, i.e., the ceramic heat storage body 11. After passing through the saddle ring 10, the gas flow direction is dispersed, presenting an irregular flow direction, which plays a certain role in uniform airflow. The gas can pass through the honeycomb ceramic body evenly, and the gas cross-sectional velocity is uniform. After adding the saddle ring 10 to the heat storage material at the bottom of the heat storage chamber, the contact area between the gas and the saddle ring 10 and the honeycomb ceramic body and other heat storage bodies is increased by changing the airflow direction, ensuring the heat exchange time between the gas and the heat storage body, improving the efficiency of heat energy transfer, and ultimately improving the heat storage capacity of the RTO equipment.
[0043] The gas splitting structure is a Pall ring.
[0044] The gas throughput of a Pall ring can be increased by more than 50% and the mass transfer efficiency can be improved by about 30%. It has the advantages of large throughput, low resistance, high separation efficiency and high operating flexibility. The Pall ring has a similar function to the saddle ring 10, but the manufacturing cost of the Pall ring is relatively high. Therefore, the saddle ring 10 is preferred.
[0045] The inner walls of the heat storage chamber are all provided with a heat insulation layer 12.
[0046] like Figure 3 As shown, the heat storage chamber is insulated with refractory aluminum silicate fiber, which is heat resistant to 1200℃. The heat storage chamber insulation is generally 250mm thick, with two insulation layers in total, including one layer of aluminum silicate fiber felt and one layer of aluminum silicate fiber module. The aluminum silicate fiber module is equipped with a heat-resistant steel skeleton, which is fixed to the furnace shell with anchors.
[0047] The housing is also provided with an inspection window 8.
[0048] like Figure 1 As shown, inspection window 8 is used for regular equipment maintenance, making it convenient for workers to enter the equipment for maintenance.
[0049] In use, the control valves open the first port 1 and the second port 2. The organic waste gas to be treated enters the first heat storage chamber 4 through the first port 1. The ceramic heat storage body 11 in the first heat storage chamber 4 stores the heat from the previous cycle. The ceramic heat storage body 11 releases heat and cools down, while the organic waste gas absorbs heat and heats up. After leaving the first heat storage chamber 4, the waste gas enters the oxidation chamber 7 at a higher temperature. At this time, the temperature of the waste gas depends on the volume of the ceramic body, the flow rate of the waste gas, and the geometric structure of the ceramic body. In the oxidation chamber 7, the organic waste gas is heated to the oxidation temperature by the burner, causing the VOC components in it to decompose into carbon dioxide and water. Since the waste gas has been preheated in the first heat storage chamber 4, the fuel consumption is greatly reduced. The oxidation chamber 7 has two functions: first, to ensure that the waste gas can reach the set oxidation temperature; and second, to ensure that there is enough residence time for the VOCs in the waste gas to be fully oxidized.
[0050] The exhaust gas is burned in the oxidation chamber 7 and becomes purified high-temperature gas before leaving the oxidation chamber 7 and entering the second heat storage chamber 5. The ceramic heat storage body 11 in the second heat storage chamber 5 has been cooled in the previous cycle and is discharged after releasing heat and cooling down. The ceramic heat storage body in the second heat storage chamber 5 absorbs a large amount of heat and heats up, which is used to heat the exhaust gas in the next cycle. The purified exhaust gas is discharged into the atmosphere through the chimney, and at the same time a small stream of purified gas is introduced to clean the third heat storage chamber 6.
[0051] After the cycle is completed, the intake and exhaust valves switch once to enter the next cycle. The exhaust gas enters from the second heat storage chamber 5 and exits from the third heat storage chamber 6. After the switch, the first heat storage chamber is cleaned, and this process is repeated alternately.
[0052] After the addition of saddle ring 10 to the heat storage material at the bottom of the heat storage chamber, the gas entering the heat storage chamber first passes through the scattered packing and then enters the honeycomb ceramic body, i.e. the ceramic heat storage body 11. After passing through the saddle ring 10, the gas flow direction is dispersed and presents an irregular flow direction, which plays a certain role in uniform airflow. The gas can pass through the honeycomb ceramic body evenly, and the gas cross-sectional velocity is uniform.
[0053] After adding a saddle ring 10 to the heat storage material at the bottom of the heat storage chamber, the contact area between the gas and the heat storage body such as the saddle ring 10 and the honeycomb ceramic body is increased by changing the airflow direction, which ensures the heat exchange time between the gas and the heat storage body, improves the efficiency of heat energy transfer, and ultimately improves the heat storage capacity of the RTO equipment.
Claims
1. A device for improving the heat storage capacity of an RTO (Regenerative Thermal Oxidizer) equipment, comprising multiple sets of steel frames and multiple sets of sheet metal, characterized in that: The RTO equipment shell is constructed by welding steel frame and sheet metal. The bottom of the shell has multiple openings, each equipped with a valve. The middle of the shell has multiple heat storage chambers corresponding to the openings. The upper part of the shell also has an oxidation chamber (7). Each heat storage chamber is equipped with a heat storage material grid (9), and each heat storage material grid (9) has a gas diversion structure. Each heat storage chamber is also equipped with a ceramic heat storage body (11). When the exhaust gas enters the heat storage chamber from the opening, the gas diversion structure can disperse the gas into an irregular flow direction, allowing it to fully contact the ceramic heat storage body (11).
2. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The steel frame is made of H-beams, and the distance between two adjacent H-beams is less than 1 meter.
3. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The openings include a first opening (1), a second opening (2), and a third opening (3). The heat storage chambers include a first heat storage chamber (4), a second heat storage chamber (5), and a third heat storage chamber (6). The first opening (1), the second opening (2), and the third opening (3) are respectively connected to the corresponding first heat storage chamber (4), second heat storage chamber (5), and third heat storage chamber (6).
4. The device for improving the heat storage capacity of an RTO device as described in claim 3, characterized in that: The first heat storage chamber (4), the second heat storage chamber (5) and the third heat storage chamber (6) are all connected to the oxidation chamber (7).
5. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The heat storage material grid (9) is a aperture grid, and a metal mesh is laid on the aperture grid.
6. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The gas diversion structure is a saddle ring (10).
7. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The gas splitting structure is a Pall ring.
8. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The inner walls of the heat storage chamber are all provided with a heat insulation layer (12).
9. The device for improving the heat storage capacity of an RTO device as described in claim 1, characterized in that: The housing is also provided with an inspection window (8).