Heat accumulating type waste gas incinerator capable of preventing organic dust from coking

Abstract

The invention discloses a heat accumulating type waste gas incinerator capable of preventing organic dust from coking, and relates to the technical field of heat accumulating type waste gas incineration.The heat accumulating type waste gas incinerator comprises a central table, a heat accumulating chamber and a combustion chamber, the central table is fixed through a support, the heat accumulating chamber is installed at the top of the central table and is a three-cavity chamber, and the combustion chamber is installed on the heat accumulating chamber; the combustion chamber is composed of a steel shell and a fireproof lining. Through a dual protection mechanism combining integrated efficient pretreatment and a replaceable sacrificial protection layer, the front switchable self-cleaning metal filter cartridge can efficiently remove organic dust before waste gas enters the regenerative chamber, and continuous operation and online cleaning are achieved through automatic switching and high-pressure backflushing; the pretreatment efficiency and continuity are obviously improved; meanwhile, the ceramic honeycomb cover plate additionally arranged on the top of the heat storage chamber serves as a detachable sacrifice protection layer, residual coking materials are actively intercepted and contained, the service life of equipment is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of regenerative thermal oxidizer technology, specifically to a regenerative thermal oxidizer for preventing organic dust from coking. Background Technology

[0002] A typical RTO has at least two ceramic regenerators;

[0003] Intake stage: The exhaust gas containing volatile organic compounds (VOCs) enters a heat storage chamber and is heated by a high-temperature ceramic medium, causing the exhaust gas temperature to rise rapidly.

[0004] Oxidation stage: High-temperature exhaust gas enters the combustion chamber and is completely oxidized and decomposed into carbon dioxide and water at high temperatures (usually above 760°C), releasing a large amount of heat;

[0005] Exhaust stage: The purified high-temperature gas enters another "cold" heat storage chamber, transfers heat to the ceramic medium, and is discharged through the chimney after its own temperature drops significantly.

[0006] Exhaust stage: The purified high-temperature gas enters another "cold" heat storage chamber, transfers heat to the ceramic medium, and is discharged through the chimney after its own temperature drops significantly.

[0007] After a heat storage chamber completes the "intake" stage, there is a brief backflushing cleaning step before switching to the "exhaust" stage. The switching valve changes the airflow path of the heat storage chamber, drawing a small stream of clean, purified high-temperature gas (or using air directly) from the system and blowing it back into the heat storage chamber at a higher pressure from the outlet end. This reverse airflow is opposite to the flow of exhaust gas during normal operation. The reverse airflow can effectively "loosen" and peel off the dust and loose particles attached to the surface and inside of the ceramic medium channel. The pollutants blown off are carried out of the heat storage chamber with this backflushing airflow and returned to the main intake pipe or a dedicated collection point. However, if the backflushing operation occurs during or after the intake combustion, some impurities in the exhaust gas will burn and melt, and remain in the heat storage body ventilation layer along with the flue gas. Over time, this can easily lead to blockage of the heat storage layer, resulting in a decrease in the overall processing efficiency of the equipment, uneven airflow, and some exhaust gas may be discharged without sufficient oxidation.

[0008] Therefore, we propose a regenerative thermal oxidizer to prevent organic dust from coking. Summary of the Invention

[0009] The purpose of this invention is to provide a regenerative waste gas incinerator that prevents organic dust from coking, thereby solving the problems mentioned in the background art;

[0010] To achieve the above objectives, the present invention provides the following technical solution: a regenerative thermal oxidizer for preventing organic dust coking, comprising a central platform, a regenerator chamber, and a combustion chamber. The central platform is fixed by a support and a regenerator chamber is installed on its top. The regenerator chamber is a three-chamber structure. A combustion chamber is installed on top of the regenerator chamber. The combustion chamber is composed of a steel shell and a refractory lining. A gas control guide box is connected to the bottom of the central platform. An exhaust pipe is connected to one side of the gas control guide box, and a clean gas pipe is connected to the other side.

[0011] A dust guide pipe is fixedly installed at the bottom of the central platform and in corresponding communication with the three chambers of the heat storage chamber. A sliding sleeve is slidably connected inside the central platform. A rack is fixed to the side of the sliding sleeve by bolts. Metal filter cartridges are evenly installed on the sliding sleeve. Ceramic media are installed in the three chambers of the heat storage chamber. The air inlet of the heat storage chamber at the bottom of the ceramic media corresponds to the metal filter cartridge. The bottom side of the metal filter cartridge corresponds to the air outlet of the gas control guide box. A burner is installed on the top inner wall of the combustion chamber.

[0012] Furthermore, a plate exchange channel is provided at the connection between the combustion chamber and the heat storage chamber and on the opposite side of the three chambers, and a ceramic honeycomb cover plate is placed on top of the ceramic medium in the heat storage chamber.

[0013] Furthermore, a backflush pipe is installed on the top of the central console, and the backflush pipe is correspondingly set with the metal filter cartridge on the inner sleeve of the central console, which is used to release the high-pressure gas in the outer compressed air tank at a fixed point to complete the flushing of the corresponding metal filter cartridge.

[0014] Furthermore, a control console is installed on the side of the central console. A rotating shaft is fixed to the end of a motor located inside the control console. A toothed sleeve 1 is slidably fitted inside the central console on the rotating shaft. A toothed sleeve 2 is slidably connected to the inner wall of the central console on one side of the toothed sleeve. A swing rod is movably connected to the opposing surfaces of the toothed sleeve 1 and the toothed sleeve 2 and located on the inner wall of the central console via a bearing. The protrusions on both sides of the swing rod abut against the side walls of the toothed sleeve 1 and the toothed sleeve 2.

[0015] Furthermore, the central platform has a symmetrically movable transmission gear set on the inner side of the shift sleeve. One side of the transmission gear set has a gear that meshes with the rack on the shift sleeve, and the other side has a gear that abuts and meshes with the corresponding gear sleeve.

[0016] Furthermore, a first stop and a second stop are welded and fixed to the side of the sliding sleeve, and the first stop and the second stop are staggered. An impact rod is movably sleeved on the top of the swing rod, and abutment posts are installed on both sides of the end of the impact rod. The abutment posts on both sides are also staggered. Springs are installed on the impact rod and the swing rod.

[0017] The method for preventing organic dust from coking in regenerative thermal oxidizers is as follows:

[0018] Integrated high-efficiency pretreatment removes organic dust in advance to prevent coking and adhesion during subsequent combustion. By installing metal filter cartridges inside the central console, the exhaust gas entering the gas control guide box is purified. The control console performs periodic self-cleaning of the metal filter cartridges. The backflush pipe uses a compressed air tank to release high-pressure gas instantly, forming a strong shock wave to clean the metal filter cartridges and complete the dust cleaning.

[0019] A switchable "sacrifice" protective layer structure is set up, and ceramic honeycomb covers are added to the top of the three ceramic media in the original heat storage chamber to actively intercept and contain most of the coking material. When the pressure drop in the combustion chamber rises to a certain value, the ceramic honeycomb covers can be lifted out online for cleaning or replacement through the plate replacement channel.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, an integrated high-efficiency pretreatment and self-cleaning mechanism is used. A movable metal filter cartridge is set in the central console to pre-filter the incoming waste gas, effectively removing impurities such as organic dust and preventing them from melting and coking during subsequent combustion. Through an automatic switching mechanism driven by the control console, the metal filter cartridge can be moved and replaced periodically. Combined with the instantaneous release of high-pressure gas by the backflushing pipe for impact cleaning, continuous self-cleaning is achieved. This design not only improves the pretreatment efficiency and avoids the lag of traditional backflushing operations, but also ensures the continuity and stability of the waste gas incineration process and reduces the risk of blockage in the regenerator.

[0022] 2. In this invention, by setting a replaceable sacrificial protective layer structure, a ceramic honeycomb cover plate is installed on top of the ceramic medium in the heat storage chamber as a "sacrificial" protective layer to actively intercept and contain residual coking material. When the pressure drop in the combustion chamber increases, the ceramic honeycomb cover plate can be quickly lifted out through the plate replacement channel and replaced or cleaned without affecting the core ceramic medium. The modular design extends the service life of the heat storage body, reduces maintenance costs and time, and maintains the efficient operation of the equipment. It solves the problem of efficiency reduction caused by the difficulty in removing coking material in traditional RTOs and achieves more comprehensive protection for the heat storage body. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the regenerative waste gas incinerator for preventing organic dust from coking according to the present invention.

[0024] Figure 2 This is a schematic diagram of the exhaust pipe installation structure on the side of the air control guide box of the present invention;

[0025] Figure 3 This is a schematic diagram of the ceramic medium placement structure in the combustion chamber of the present invention;

[0026] Figure 4This is a schematic diagram of the sliding structure of the metal filter cartridge driven by the inner moving sleeve of the central platform in this invention;

[0027] Figure 5 This is a schematic diagram of the metal filter cartridge side-shifting sleeve driven by a transmission gear set according to the present invention;

[0028] Figure 6 This is a schematic diagram of the transmission gear sets on both sides of the present invention being driven alternately by gear sleeve one and gear sleeve two;

[0029] Figure 7 This is a schematic diagram showing the contact between the bottom protrusion of the rocker arm and the annular surfaces of the first and second toothed sleeves of the present invention.

[0030] In the diagram: 1. Central console; 2. Gas control guide box; 3. Exhaust pipe; 4. Dust guide pipe; 5. Control console; 6. Rotating shaft; 7. Shifting sleeve; 8. Metal filter cartridge; 9. Rack; 10. Stop block one; 11. Stop block two; 12. Transmission gear set; 13. Gear sleeve one; 14. Gear sleeve two; 15. Swing rod; 16. Impact rod; 17. Abutment column; 18. Spring; 19. Backflush pipe; 20. Regenerator; 21. Combustion chamber; 22. Ceramic medium; 23. Ceramic honeycomb cover plate; 24. Plate changing channel; 25. Burner. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-7 The present invention provides a technical solution:

[0033] Example 1: During the waste gas treatment process, impurities such as dust, particulate matter, and tar contained in the waste gas will enter the ceramic medium 22 layer with the airflow. If they accumulate over a long period of time, they will cause blockage of the medium channel. The regenerative thermal oxidizer has a built-in "back-blowing self-cleaning" function, which can blow and clean the ceramic medium 22 layer. However, if the waste gas contains organic dust, such as resin, plastic particles, and asphalt fumes, after entering the ceramic medium 22, it will not be completely burned at the RTO operating temperature. Instead, it will first melt into a liquid or viscous state. These viscous substances will soak into and adhere to the ceramic wall surface. Under continuous high temperature, they will polymerize and carbonize to form a hard, three-dimensional network of coke material, which is firmly combined with the ceramic surface. The coke material is no longer discrete particles, but a continuous, hard solid covering layer. The airflow cannot pass through its interior and therefore cannot "blow it away".

[0034] Therefore, preventative treatment is the most economical approach. Before the exhaust gas enters the RTO, it undergoes pretreatment using equipment such as electrostatic precipitators, high-efficiency bag filters, and wet scrubbers to remove most of the organic dust, especially sticky components. This type of equipment is typically installed separately from the RTO. Figure 1 As shown, this application installs multiple sets of metal filter cartridges 8 in the central platform 1, and can switch the position of the metal filter cartridges 8 to complete the corresponding self-cleaning work. It integrates the ability to intercept impurities and automatically clean at the air inlet end of the entire RTO equipment, improving the overall efficiency and effect of waste gas pretreatment without affecting the operation of the waste gas incineration equipment.

[0035] Combination Figure 2 , Figure 3 and Figure 4 The top of the central box is equipped with a heat storage chamber 20, and the top of the heat storage chamber 20 is equipped with a combustion chamber 21. The main body of the heat storage chamber 20 consists of three chambers: chamber A, chamber B, and chamber C. Each chamber is equipped with a ceramic medium 22. The exhaust gas first enters the gas control guide box 2 through the exhaust pipe 3, and then enters the central platform 1 through the guide. It then enters the heat storage chamber 20 through the metal filter cartridge 8 at a specific position on the central platform 1, and finally arrives at the combustion chamber 21, where it is heated by the burner 25.

[0036] The incinerated gas enters another chamber through the guide airflow to complete the heating of the corresponding ceramic medium 22. Then, a stream of clean gas is introduced to complete the back-blowing cleaning of the ceramic medium 22 in the air intake chamber. The back-blowing dust gas passes behind the metal filter cartridge 8, and while cleaning the metal filter cartridge 8, the dust gas is blown into the clean gas pipe for subsequent unified treatment.

[0037] And such Figure 4 As shown, there are six metal filter cartridges 8 connected to the corresponding chambers in the entire central console 1. Considering that the switching of metal filter cartridges 8 does not affect the normal operation of the regenerative thermal septic gas incinerator, the cleaning of metal filter cartridges 8 is carried out in the combustion chamber 21. However, the cleaning here is delayed, which means that when the metal filter cartridges 8 at the bottom of the other two chambers need to be treated, it will affect the normal septic gas treatment.

[0038] Therefore, a shift sleeve 7 is installed on the metal filter cartridge 8. The shift sleeve 7 drives the metal filter cartridge 8 to switch between the inlet of the ceramic medium 22 and the inlet of the dust guide pipe 4, thus completing the switching of the working metal filter cartridge 8 at the ceramic medium 22. On the one hand, it does not affect the normal entry and exit of exhaust gas, and on the other hand, it can also be used for ventilation and dust removal during the exhaust gas incineration process.

[0039] Regarding the position switching of the metal filter cartridge 8, a rack 9 is installed on the side of the shift sleeve 7. Two transmission gear sets 12 are also movably connected to the inner wall of the central platform 1. The gear on one side of the transmission gear set 12 meshes with the rack 9. The shift sleeve 7 with the metal filter cartridge 8 is driven to slide and switch through the rotation of the gear. The other side of the transmission gear set 12 is driven by the sliding adjustable gear sleeve 13 and gear sleeve 2 14. The two alternately contact the corresponding side of the transmission gear set 12. The teeth on the surfaces of the two mesh and transmit power. The rotating shaft 6 driven by the motor on the control panel 5 side of the central platform 1 drives the gear sleeve 13 to rotate, and the gear sleeve 13 is slidably connected to the rotating shaft 6.

[0040] To enable the alternating movement of gear sleeve 13 and gear sleeve 2 14, a rocker arm 15 is movably connected between them. The rocker arm 15 is T-shaped, with protrusions on both sides engaging with I-shaped grooves on the surfaces of gear sleeve 13 and gear sleeve 2 14, respectively. An impact rod 16 is also mounted on the rotation axis of the rocker arm 15, with abutment posts 17 on the impact rod 16. The abutment posts 17 on both sides are not at the same height, and stop blocks 10 and 11 are correspondingly provided to the abutment posts 17. Figure 5 and Figure 6 As shown, the two are set at different heights and abut against the corresponding abutment post 17. With the rotation of the shaft 6, the second stop 11 moves to the right and contacts the single abutment post 17 of the impact post, causing the impact post to rotate. A spring 18 is set between the impact post and the swing rod 15. Finally, with the extension of the spring 18, the entire swing rod 15 rotates, causing the second gear sleeve 14 to move inward and contact the transmission gear set 12. Since the gear on the shaft 6 can drive the side shaft post of the second gear sleeve 14 to rotate, the rotation of the shaft 6 at this time realizes the rotation of the right transmission gear set 12, causing the shift sleeve 7, which was originally moving to the right, to start moving to the left, completing the switching operation of the metal filter cartridge 8 at different locations. Figure 7 As shown;

[0041] The separated metal filter cartridge 8, whose inner wall is covered with dust, needs to be processed, such as... Figure 1 As shown, the backflush pipe 19 installed on the top of the central console 1 starts to work, blowing high-pressure airflow toward the metal filter cartridge 8 at this time. The generated dust gas comes to the dust guide pipe 4 through the pipeline and is discharged outside, realizing the treatment of multiple sets of metal filter cartridges 8 in the process of waste gas incineration without affecting the normal waste gas treatment.

[0042] Example 2: Pre-treatment dust interception reduces the negative impact of subsequent incineration coking on the entire ceramic medium 22. Even so, the exhaust gas still contains a small amount of impurities, which will more or less affect the ceramic medium 22. Therefore, as follows... Figure 3 As shown, at the uppermost end of the ceramic medium 22 in each heat storage chamber 20, a layer of easily removable and inexpensive "sacrificial" ceramic honeycomb cover plate 23 is provided;

[0043] This structure serves as the "first line of defense," actively intercepting and accommodating most of the coking material. When the pressure drop rises to a certain value, this "sacrificial layer" module can be lifted out for cleaning or replacement online or semi-online through the plate replacement channel 24 of the combustion chamber 21, while the core ceramic medium 22 heat storage body remains unaffected. This is equivalent to adding a "replaceable filter" to the expensive core heat storage body.

[0044] By setting a front-mounted switchable self-cleaning intercepting metal filter cartridge 8, and placing a ceramic honeycomb cover plate 23 on top of the ceramic medium 22, comprehensive protection of the core heat storage body can be achieved.

[0045] Working principle of this invention:

[0046] Organic waste gas containing VOCs enters the air control guide box 2 through the exhaust pipe 3 and is guided to the A chamber path which is in the air intake state. The waste gas first enters the central platform 1 and passes through the metal filter cartridge 8 corresponding to the A chamber, where the first stage of precision filtration is completed. Most of the organic dust is intercepted. Then, the pre-treated waste gas enters the A heat storage chamber 20, passes through the ceramic honeycomb cover plate 23, and finally flows through the high-temperature ceramic medium 22 layer. The waste gas is rapidly heated to near the oxidation temperature by the heat stored in the ceramic medium 22. The high-temperature waste gas enters the combustion chamber 21, where, with the assistance of the burner 25, the VOCs are completely oxidized and decomposed into carbon dioxide and water, and a large amount of heat is released.

[0047] The purified high-temperature clean gas enters chamber B, which is in the exhaust state, under the action of the induced draft fan. The high-temperature gas flows from top to bottom through the ceramic medium 22 in chamber B, transferring the heat contained in it to the ceramic medium 22. The temperature of the gas itself drops significantly. Finally, the cooled clean gas is discharged from the system through the corresponding metal filter cartridge 8, central console 1, gas control guide box 2 and clean gas pipe.

[0048] Before switching to the intake mode, chamber C will undergo a brief backflushing. A stream of clean air, either drawn from the main purification air pipe or independent, is blown in reverse from the top of chamber C. This reverse airflow loosens and peels off the loose particles attached to the ceramic medium 22 and the ceramic honeycomb cover 23 channel surface of chamber C, and carries them downwards. The dust-laden gas that is blown out also passes through the corresponding metal filter cartridge 8 at the bottom of chamber C. Some of the dust is filtered and trapped, while some of it merges into the main airflow along with the gas.

[0049] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A regenerative thermal oxidizer for preventing coking of organic dust, comprising a central platform (1), a regenerator (20), and a combustion chamber (21), wherein the central platform (1) is fixed by a support and the regenerator (20) is mounted on top, the regenerator (20) being a three-chamber unit, and the combustion chamber (21) is mounted on the regenerator (20), the combustion chamber (21) being composed of a steel shell and a refractory lining, characterized in that, The bottom of the central platform (1) is connected to a gas control guide box (2), and an exhaust pipe (3) is connected to one side of the gas control guide box (2), and a clean air pipe is connected to the other side. Dust guide pipes (4) are fixedly connected to the bottom of the central platform (1) and to the three chambers of the heat storage chamber (20). A sliding sleeve (7) is slidably connected inside the central platform (1). A rack (9) is fixed to the side of the sliding sleeve (7) by bolts. Metal filter cartridges (8) are evenly installed on the sliding sleeve (7). Ceramic medium (22) is installed in the three chambers of the heat storage chamber (20). The air inlet of the heat storage chamber (20) at the bottom of the ceramic medium (22) corresponds to the metal filter cartridge (8). The bottom side of the metal filter cartridge (8) corresponds to the air outlet of the air control guide box (2). A burner (25) is installed on the top inner wall of the combustion chamber (21).

2. The regenerative thermal oxidizer for preventing organic dust coking according to claim 1, characterized in that, A plate exchange channel (24) is provided at the connection between the combustion chamber (21) and the heat storage chamber (20) and on the opposite side of the three chambers. A ceramic honeycomb cover plate (23) is placed on top of the ceramic medium (22) in the heat storage chamber (20).

3. The regenerative thermal oxidizer for preventing organic dust coking according to claim 2, characterized in that, The top of the central platform (1) is equipped with a backflush pipe (19), which is correspondingly set with the metal filter cartridge (8) on the inner sleeve (7) of the central platform (1) to release the high pressure gas in the outer compressed air tank at a fixed point and complete the flushing of the corresponding metal filter cartridge (8).

4. The regenerative thermal oxidizer for preventing organic dust coking according to claim 3, characterized in that, A control panel (5) is installed on the side of the central platform (1). A rotating shaft (6) is fixed at the end of the motor located inside the control panel (5). A toothed sleeve (13) is slidably fitted inside the central platform (1) on the rotating shaft (6). A toothed sleeve (14) is slidably connected to the inner wall of the central platform (1) on the side of the toothed sleeve (13). A swing rod (15) is movably connected to the opposite face of the toothed sleeve (13) and the toothed sleeve (14) on the inner wall of the central platform (1) through a bearing. The protrusions on both sides of the swing rod (15) abut against the side walls of the toothed sleeve (13) and the toothed sleeve (14).

5. The regenerative thermal oxidizer for preventing organic dust coking according to claim 4, characterized in that, The central platform (1) has a symmetrically movable transmission gear set (12) on the inner side of the shift sleeve (7). One side of the transmission gear set (12) meshes with the rack (9) on the shift sleeve (7), and the other side of the gear abuts and meshes with the corresponding gear sleeve (13).

6. The regenerative thermal oxidizer for preventing organic dust coking according to claim 5, characterized in that, The sliding sleeve (7) is welded and fixed with a first stop block (10) and a second stop block (11), and the first stop block (10) and the second stop block (11) are staggered. The top of the swing rod (15) is fitted with a movable impact rod (16), and the two sides of the end of the impact rod (16) are respectively equipped with abutment posts (17), and the two sides of the abutment posts (17) are also staggered. Springs (18) are installed on the impact rod (16) and the swing rod (15).

7. The regenerative thermal oxidizer for preventing organic dust coking according to claim 6, characterized in that, The method for preventing organic dust from coking in regenerative thermal oxidizers is as follows: Integrated high-efficiency pretreatment removes organic dust in advance to avoid coking and sticking during subsequent combustion. The exhaust gas entering the gas control guide box (2) is purified by the metal filter cartridge (8) set on the inner sleeve (7) of the central platform (1). The metal filter cartridge (8) is periodically switched and self-cleaned by the monitoring and control platform (5). The backflush pipe (19) uses a compressed air storage tank to release high-pressure gas in an instant, forming a strong shock wave to clean the metal filter cartridge (8) and complete the dust cleaning. A switchable "sacrifice" protective layer structure is set up, and ceramic honeycomb cover plates (23) are added to the top of the three ceramic media (22) in the original heat storage chamber (20) to actively intercept and contain most of the coking material. When the pressure drop in the combustion chamber (21) rises to a certain value, the ceramic honeycomb cover plate (23) is lifted out online for cleaning or replacement through the plate replacement channel (24).

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