Regenerative oxidation device and method for regulating the heat balance of the regenerative chamber thereof

Abstract

The present application relates to a heat accumulating oxidation device. The device comprises a furnace body (C) which is composed of a heat accumulating chamber (1) filled with heat accumulating medium and an oxidation chamber (2) not filled with heat accumulating medium, the heat accumulating chamber (1) comprises a low-temperature heat accumulating section (10) away from the oxidation chamber (2) and filled with a first heat accumulating medium (M1) and a high-temperature heat accumulating section (30) adjacent to the oxidation chamber (2) and filled with a second heat accumulating medium (M2). The heat accumulating chamber (1) further comprises a temperature adjusting section (20) between the low-temperature heat accumulating section (10) and the high-temperature heat accumulating section (30), and a heat accumulating chamber heat exchanger (3) for adjusting the temperature gradient in the heat accumulating chamber (1) is arranged in the temperature adjusting section (20). The above-mentioned heat accumulating oxidation device is suitable for waste gas containing high-concentration low-burning-point combustible, and can maintain low energy consumption while having high working efficiency. In addition, the present application also relates to a heat balance adjusting method of the heat accumulating chamber of the above-mentioned heat accumulating oxidation device.

Description

Technical Field

[0001] This invention relates to a regenerative oxidation device, and more specifically, to a regenerative oxidation device with a regenerative chamber heat balance regulation function. Furthermore, this invention also relates to a method for heat balance regulation of the regenerative chamber in the aforementioned regenerative oxidation device. Background Technology

[0002] High-temperature pyrolysis is currently the most effective method for treating malodorous, toxic, harmful, and organic greenhouse gases. Among them, regenerative thermal oxidative pyrolysis (RTO) has outstanding technical features in terms of energy saving and improving treatment efficiency, and is widely used in the industry.

[0003] The working principle of a regenerative thermal oxidizer using the regenerative pyrolysis method can be summarized as follows: Waste gas comes into full contact with oxygen in a combustion chamber heated to a high temperature, where organic compounds are oxidized and decomposed into CO2 and H2O, thus achieving purification. The high-temperature gas releases heat as it passes through the ceramic regenerator, which can be used to preheat the next batch of waste gas. This heat circulation mechanism significantly reduces fuel consumption, achieving energy savings. The regenerator is typically divided into multiple chambers, such as three-chamber or five-chamber chambers, with periodic switching between heat absorption and release achieved through reversing valves and / or rotating devices. Each chamber needs to be purged with clean air after intake to remove residual organic compounds and ensure treatment efficiency.

[0004] According to the requirements of the "Technical Specification for Industrial Organic Waste Gas Treatment Engineering by Regenerative Combustion Method" (HJ1093-2020) issued by the Ministry of Ecology and Environment of China, the normal operating temperature of regenerative oxidation devices operating by regenerative pyrolysis should be higher than or equal to 760℃. At this temperature, most common organic pollutants can not only be efficiently converted into clean CO2 and H2O, but the removal efficiency can also reach more than 99% within 1 second.

[0005] However, when using regenerative thermal oxidizers to treat exhaust gases with high concentrations (e.g., LEL value ≥ 5%) and containing a significant amount of low-ignition-point substances (such as acetone), a strong oxidation reaction often occurs after the exhaust gas enters the regenerator chamber but before it reaches the high-temperature end of the regenerator chamber connected to the oxidation chamber. In this case, the heat released by the oxidation reaction is largely absorbed by the regenerator and cannot be effectively transferred to the oxidation chamber, leading to an abnormally high temperature in the regenerator chamber. This can further evolve into a situation where the exhaust gas temperature of the regenerative oxidation system rises, possibly accompanied by an excessively low oxidation chamber temperature.

[0006] To avoid the above situation, existing solutions typically maintain the temperature balance inside the regenerator by increasing the flow rate of the exhaust gas through the regenerator and / or reducing the heat exchange area of ​​the regenerator. Alternatively, the exhaust gas flow rate designed for the regenerator can be increased by diluting the exhaust gas concentration, which can also achieve temperature balance inside the regenerator.

[0007] However, the above solutions reduce the energy efficiency of regenerative thermal oxidation to some extent. Furthermore, for the same regenerative thermal oxidation unit, its adjustable capacity is very limited under different operating conditions, including varying exhaust gas calorific values, combustible ignition points, and exhaust gas throughput. If the above solutions are adopted, when the exhaust gas calorific value decreases, it will be necessary to use active heating methods that require additional energy consumption to maintain the normal operating temperature of the regenerative chamber.

[0008] Therefore, it is necessary to design a regenerative thermal oxidation device suitable for waste gas containing high concentrations of low-ignition-point combustibles, which can maintain low energy consumption while having high operating efficiency. Summary of the Invention

[0009] The purpose of this invention is to provide a regenerative thermal oxidation device suitable for waste gas containing high concentrations of low-ignition-point combustibles, which has high operating efficiency and low energy consumption.

[0010] Another object of the present invention is to provide a method for adjusting the heat balance of the heat storage chamber of the above-mentioned regenerative oxidation device.

[0011] The first aspect of the present invention relates to a regenerative oxidation device, comprising a furnace body, the furnace body being composed of a regenerative chamber filled with a regenerative medium and an oxidation chamber not filled with a regenerative medium, the regenerative chamber comprising a low-temperature regenerative section distant from the oxidation chamber and filled with a first regenerative medium and a high-temperature regenerative section adjacent to the oxidation chamber and filled with a second regenerative medium, the regenerative chamber further comprising a temperature regulating section located between the low-temperature regenerative section and the high-temperature regenerative section, the temperature regulating section being provided with a regenerative chamber heat exchanger for regulating the temperature gradient within the regenerative chamber.

[0012] The term "high-temperature regenerative section" refers to a high-temperature regenerative section with a structure known in the art, whose function is to enable heat exchange between the waste gas entering and exiting the oxidation chamber through surface heat exchange. The thickness of the high-temperature regenerative section is closely related to the final heat storage or energy-saving effect, and also to the waste gas inlet / outlet switching cycle selected during the operation of the regenerative oxidation device. A larger high-temperature regenerative section thickness corresponds to a higher heat storage effect and a longer switching cycle. Of course, a larger high-temperature regenerative section thickness will also reduce the ability of the temperature regulation section to effectively control the temperature gradient of the high-temperature regenerative section, easily causing imbalance and overheating. Therefore, from the perspective of overall energy saving, an optimal thickness can be determined based on the different calorific values ​​of the waste gas and the ignition points of the combustibles.

[0013] Similarly, the term "low-temperature heat storage section" refers to a low-temperature heat storage section with a structure known in the art, whose structure, function, and layer thickness setting principles are the same as those of the cold end of a conventional heat storage chamber.

[0014] In this application, the term "temperature regulating section" refers to a temperature regulating section equipped with a heat exchanger in a regenerator chamber. This heat exchanger not only has a piping or channel system with heat exchange capacity but also retains its heat storage capacity as much as possible. The maximum heat exchange capacity of the piping or channel system determines the regenerable oxidation device's ability to control the temperature gradient within the regenerator chamber.

[0015] The first heat storage medium can be one of honeycomb, saddle block, or granular heat storage media, and the second heat storage medium can be spherical granular heat storage media. Of course, other types of heat storage media used in the hot end of existing heat storage chambers can also be used to replace the first and second heat storage media.

[0016] Preferably, the porosity of the first heat storage medium is higher than that of the second heat storage medium, and the heat transfer efficiency of the first heat storage medium is higher than that of the second heat storage medium.

[0017] In one embodiment, the heat exchanger of the heat storage chamber can be a piping system with heat exchange capability, in which a third heat storage medium is filled between the pipes of the piping system. The heat exchange medium flows in the piping system and exchanges heat with the third heat storage medium to regulate the temperature gradient in the heat storage chamber.

[0018] The heat exchange medium can be a fluid or gas that flows or moves in a piping system. When the heat exchange medium is a fluid, water or heat transfer oil can be selected as the heat exchange medium; when the heat exchange medium is a gas, air or nitrogen can be selected as the heat exchange medium.

[0019] Preferably, the piping system maintains a predetermined contact area with the third heat storage medium while passing through the temperature regulation section.

[0020] In another embodiment, the heat exchanger of the heat storage chamber can be a channel system with heat exchange capability. When the heat exchange medium is a gas such as air or nitrogen, the heat exchange medium flows unidirectionally within the channel formed by the third heat storage medium itself and exchanges heat with the third heat storage medium to regulate the temperature gradient in the heat storage chamber.

[0021] In the above technical solution, the so-called "channels formed by the third heat storage medium itself" includes both the pore channels formed by the pores of the third heat storage medium itself and the gap channels left between the third heat storage media which are configured in various shapes. For example, a solid-formed honeycomb heat storage medium containing mutually isolated exhaust gas channels and heat exchange medium channels is made of silicon carbide ceramic.

[0022] Preferably, an oxidation chamber heat exchanger can also be installed in the oxidation chamber, which allows the waste gas inside the oxidation chamber to exchange heat with the heat exchange medium flowing through the oxidation chamber heat exchanger.

[0023] More preferably, the heat exchange medium can enter the channel system through the heat exchange medium inlet. After passing through the temperature regulation section, the channel system branches to the middle inlet / outlet of the heat exchange medium on one hand, and passes through the oxidation chamber heat exchanger to the heat exchange medium outlet on the other hand.

[0024] The second aspect of the present invention relates to a method for adjusting the heat balance of the regenerator chamber of a regenerator oxidation device as described in the first aspect of the present invention, comprising: adjusting the heat exchange efficiency of the heat exchanger of the regenerator chamber based on at least one of the following parameters: temperature of the regenerator chamber temperature control sampling point, temperature of the oxidation chamber, temperature change trend of the oxidation chamber, concentration of combustibles in the waste gas, calorific value of the waste gas, ignition point of the combustibles, and flow rate of the waste gas.

[0025] The above-mentioned adjustment method is generally based on adjusting the medium flow rate of the heat exchanger in the heat storage chamber according to the temperature of the temperature control sampling point in the heat storage chamber and / or the temperature of the oxidation chamber. This adjustment method may also be affected by various factors such as the structural settings of the high-temperature heat storage section, temperature regulation section and low-temperature heat storage section of the heat storage chamber, the ignition point, calorific value and flow rate of the combustible components of the exhaust gas and the heat output strategy. Therefore, artificial intelligence can be used to optimize the operation procedure of the adjustment method.

[0026] By adjusting the heat exchange efficiency of the regenerator, a suitable temperature gradient can be maintained in the high-temperature regenerator section during the operation of the regenerable oxidation device. Therefore, adjusting the heat exchange efficiency of the regenerator also allows control over the proportion of organic matter in the waste gas undergoing exothermic oxidation reactions in the regenerator and oxidation chambers, respectively.

[0027] The principle for controlling the temperature gradient in the high-temperature heat storage section is to use the operating temperature of the adjustable and dynamically balanced temperature regulation section as the cold end temperature of the high-temperature heat storage section, and the oxidation chamber temperature as the hot end temperature. The temperature difference between the two ends forms a precise and controllable temperature gradient within the high-temperature heat storage section. By adjusting the cold end temperature, the ignition point temperature of the combustible is positioned sufficiently close to the oxidation chamber end of the high-temperature heat storage section. Simultaneously, this temperature gradient maintains the heat storage chamber's ability to achieve the highest possible energy-saving efficiency for the RTO through surface heat exchange.

[0028] On the one hand, by increasing the flow rate of the heat exchange medium, a large temperature gradient can be maintained in the high-temperature heat storage section, causing the combustibles in the exhaust gas to be oxidized and release heat as much as possible near the high-temperature end face of the high-temperature heat storage section and in the oxidation chamber. After the temperature of the heat storage medium at the high-temperature end face of the high-temperature heat storage section rises, most of the heat can enter the oxidation chamber by thermal radiation.

[0029] On the other hand, by increasing the heat output of the heat exchanger in the regenerator, it is not necessary to install a heat output device in the oxidation chamber to maintain an appropriate oxidation chamber temperature. This is suitable for treating exhaust gases with lower calorific values ​​and simplifies the structure related to heat release or heat output in the regenerator oxidation device.

[0030] By reducing the flow rate of the heat exchange medium, the temperatures of the high-temperature heat storage section and the temperature regulation section are raised to a suitable range, causing some of the combustibles in the exhaust gas to oxidize and release heat. This heat is then dissipated through the heat exchanger in the heat storage chamber of the temperature regulation section, while the remaining heat is released within the oxidation chamber to maintain a suitable temperature. The temperature change trend in the oxidation chamber reflects its thermal equilibrium state and serves as the basis for adjusting the flow rate of the medium in the heat storage chamber heat exchanger during the operation of the control strategy.

[0031] Furthermore, when the calorific value of the exhaust gas significantly exceeds the value required to maintain RTO operation, the temperature inside the oxidation chamber will rise noticeably. This heat can be removed from the oxidation chamber through heat exchanger exchange or direct hot air output. The heat storage chamber heat exchanger and the oxidation chamber heat exchanger can be connected via piping, allowing the cooling medium discharged from the heat storage chamber heat exchanger to enter the oxidation chamber heat exchanger for further heating. This fully utilizes the heat removed by the heat storage chamber heat exchanger.

[0032] An intermediate inlet / outlet of the heat exchange medium can be set on the connecting pipeline between the heat storage chamber heat exchanger and the oxidation chamber heat exchanger, so that the flow rate of the heat storage chamber heat exchanger and the oxidation chamber heat exchanger can be controlled independently.

[0033] Preferably, the temperature of the heat storage chamber temperature control sampling point can be sampled based on one or more heat storage chamber temperature control sampling points, which are located between the high-temperature heat storage section and the temperature regulation section.

[0034] In the case of a single heat storage chamber temperature control sampling point, a point within the high-temperature heat storage section or the temperature regulation section can be set as the heat storage chamber temperature control sampling point, or a point between the high-temperature heat storage section and the temperature regulation section can be set as the heat storage chamber temperature control sampling point, such as a point in the piping system of the second heat storage medium at the upper end face of the heat storage chamber heat exchanger that is far away from the heat storage chamber heat exchanger.

[0035] In the case of multiple temperature control sampling points in the heat storage chamber, a combination of multiple temperature control sampling points within the high-temperature heat storage section and / or temperature regulation section can also be set as the heat storage chamber temperature control sampling point. Although this setup is more complex, it can make the sampling results more accurate.

[0036] The regenerative oxidation apparatus and the heat balance adjustment method of the regenerative oxidation chamber of the present invention can achieve the following advantages: (i) The device and its heat balance adjustment method for the heat storage chamber can effectively solve the technical problems of excessively low oxidation temperature and overheating of the heat storage chamber caused by high concentration of low ignition point combustibles in the exhaust gas.

[0037] (ii) The device and its heat balance regulation method for the heat storage chamber can remove appropriate heat by controlling the heat exchanger of the heat storage chamber temperature regulation section, so that the oxidation chamber can maintain a suitable temperature. Within a certain range, it can replace the function of the existing oxidation chamber to dissipate heat or remove heat through a specific device.

[0038] (iii) The device and its heat storage chamber heat balance adjustment method can adapt to the working condition of the combustibles in the exhaust gas having too low calorific value: when the calorific value of the exhaust gas is low enough, as long as the heat exchanger of the heat storage chamber in the heat storage chamber temperature adjustment section stops the heat output, the heat storage chamber used by the device can be restored to a normal heat storage chamber adapted to low calorific value exhaust gas. Attached Figure Description

[0039] To further illustrate the technical effects of the regenerative oxidation device according to the present invention and the heat balance adjustment method of the regenerative oxidation chamber of the above-described regenerative oxidation device, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a cross-sectional schematic diagram of a first embodiment of a regenerative thermal oxidation device according to the present invention, wherein the direction of the exhaust gas in the oxidation chamber of the regenerative thermal oxidation device is shown by the large hollow arrow in the figure, the direction of the heat exchange medium in the heat exchanger of the regenerative chamber is shown by the small solid arrow in the figure, and the direction of the exhaust gas in each inlet and outlet pipeline is shown by the small hollow arrow in the figure. Figure 2 This is a cross-sectional schematic diagram of a second embodiment of the regenerative thermal oxidation device according to the present invention, wherein the direction of the exhaust gas traveling in the oxidation chamber of the regenerative thermal oxidation device is shown by the large hollow arrow in the figure, and the direction of the heat exchange medium flowing in the heat exchanger of the regenerative chamber is shown by the small hollow arrow in the figure; and Figure 3 This is a cross-sectional schematic diagram of a third embodiment of the regenerative thermal oxidation device according to the present invention, wherein the direction of the exhaust gas in the oxidation chamber of the regenerative thermal oxidation device is shown by the large hollow arrow in the figure, and the direction of the heat exchange medium flowing in the heat exchanger of the regenerative chamber and the heat exchanger of the oxidation chamber is shown by the small hollow arrow in the figure.

[0040] Figure Labels Detailed Implementation

[0041] The following description, in conjunction with the accompanying drawings, illustrates the structure and working principle of several embodiments of the regenerative oxidation device according to the present invention, as well as the operation process of the heat balance adjustment method for the heat storage chamber of the above-mentioned regenerative oxidation device.

[0042] It should be understood that the embodiments described in this specification cover only a portion of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this specification without inventive effort are within the scope of protection of this invention.

[0043] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings are intended to cover a non-exclusive inclusion. The singular forms "a," "described," and "the" as used in the embodiments of the invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0044] First Embodiment

[0045] Please see Figure 1 This figure is a side sectional view of a first embodiment of the regenerative oxidation device according to the present invention. Figure 1 As shown, the regenerative oxidation device according to the present invention includes a furnace body C whose internal portion is filled with a regenerative medium. The furnace body C is typically cylindrical. Of course, the furnace body C can also be designed with other suitable shapes depending on the actual situation.

[0046] Generally speaking, the area in furnace body C filled with heat storage medium is called heat storage chamber 1, while the area not filled with heat storage medium is called oxidation chamber 2. In other words, furnace body C is divided into heat storage chamber 1 and oxidation chamber 2 based on whether or not it is filled with heat storage medium.

[0047] In the heat storage chamber 1, a low-temperature heat storage section 10, a temperature regulating section 20, and a high-temperature heat storage section 30 are arranged sequentially according to their distance from the oxidation chamber 2. The low-temperature heat storage section 10 is furthest from the oxidation chamber 2, the high-temperature heat storage section 30 is closest to the oxidation chamber 2, and the temperature regulating section 20 is located between the low-temperature heat storage section 10 and the high-temperature heat storage section 30. The purpose of the low-temperature heat storage section 10 and the high-temperature heat storage section 30 is to enable heat exchange between the waste gas entering and exiting the oxidation chamber 2 through surface heat exchange, while the purpose of the temperature regulating section 20 is to regulate the temperature gradient within the heat storage chamber 1 using the heat exchanger 3 installed within it.

[0048] The low-temperature heat storage section 10 is filled with a first heat storage medium M1, which is typically a honeycomb, saddle block, or granular heat storage medium. The high-temperature heat storage section 30 is filled with a second heat storage medium M2, which is typically a different heat storage medium from the first heat storage medium M1, such as a spherical granular heat storage medium. The porosity of the first heat storage medium M1 is higher than that of the second heat storage medium M2, and the heat transfer efficiency of the first heat storage medium M1 is higher than that of the second heat storage medium M2. In other words, compared with the first heat storage medium M1, the second heat storage medium M2 preferably uses a heat storage medium with a lower porosity, a larger heat capacity, and lower heat transfer efficiency between particles.

[0049] In this embodiment, the heat exchanger 3 in the heat storage chamber is a piping system with heat exchange capacity. The heat exchange medium inlet 6 and the heat exchange medium outlet 7 of the piping system are arranged together, so that the heat exchange medium M can be absorbed and / or discharged from a medium source (not shown in the figure), which is usually located near or outside the low-temperature heat storage section 10. The heat exchange medium M enters the piping system from the heat exchange medium inlet 6, passes through the first heat storage medium M1 in the low-temperature heat storage section 10, and is distributed in a serpentine manner within the temperature regulating section 20, so that the heat exchange medium M can fully exchange heat with the temperature regulating section 20 within the piping system, and finally leaves the piping system through the heat exchange medium outlet 7. In this embodiment, the heat exchange medium M can be a fluid (e.g., water, heat transfer oil, etc.) or a gas (e.g., air, nitrogen, etc.).

[0050] The temperature regulating section 20 is filled with a third heat storage medium M3. For example, silicon carbide ceramic honeycomb can be used as the third heat storage medium M3, and the piping system is a prefabricated pipe system formed during the honeycomb molding process. Since the piping system is serpentinely distributed within the temperature regulating section 20, the third heat storage medium M3 is actually filled between the pipes of the piping system. The third heat storage medium M3 is usually a heat storage medium with high thermal conductivity. The "thermal conductivity" mentioned here includes not only the heat transfer efficiency within the heat storage medium but also the heat transfer efficiency between the heat storage medium and the piping system.

[0051] At least one spacer 8, such as a baffle, can be arranged inside the furnace body C. The spacer 8 passes through the first heat storage medium M1, the third heat storage medium M3, and the second heat storage medium M2, and longitudinally divides the oxidation chamber 2 inside the furnace body C into two regions. Figure 1As shown, the oxidation chamber 2 is divided into a first region C1 and a second region C2. A gap exists between the top of the spacer 8 and the inner wall of the oxidation chamber 2, through which the first region C1 and the second region C2 are connected. The waste gas to be treated sequentially enters the first region C1 of the oxidation chamber 2 through the low-temperature heat storage section 10, the temperature regulating section 20, and the high-temperature heat storage section 30, and then passes through the aforementioned gap into the second region C2, becoming treated waste gas. Finally, it sequentially passes through the high-temperature heat storage section 30, the temperature regulating section 20, and the low-temperature heat storage section 10 before being discharged from the furnace body C.

[0052] For simplicity, this embodiment only uses one spacer 8 to divide the oxidation chamber 2 inside the furnace body C into two regions. In practical applications, the oxidation chamber 2 is often divided into three or more odd-numbered regions, such as three or five regions. Since the number of regions is not particularly relevant to the technical problem to be solved by this invention, it will not be elaborated here.

[0053] The furnace body C is externally equipped with a first inlet / outlet pipeline L1, a second inlet / outlet pipeline L2, and a third inlet / outlet pipeline L3 to introduce the waste gas to be treated into the furnace body C and / or to discharge the treated waste gas from the furnace body C. Clean gas is also introduced for purging after the intake process in the regenerator chamber 1 ends and before the exhaust process begins. Of course, the number of inlet / outlet pipelines is not limited to three sets; the number of pipelines can be increased or decreased. For example... Figure 1 The third inlet / outlet pipeline L3, shown by the dashed line, can also be omitted in practical applications.

[0054] The first inlet / outlet pipeline L1, the second inlet / outlet pipeline L2, and the third inlet / outlet pipeline L3 are all equipped with valves to control the entry and exit of exhaust gas. The furnace body C also includes an inlet / outlet gas control section with a purging function; particularly for two-chamber RTOs, some complex control structures are designed. Since these auxiliary structures are not closely related to the technical problem to be solved by this invention, they will not be described in detail here.

[0055] Each pipe in the piping system maintains a specified contact area with the first heat storage medium M1 in order to retain the maximum possible heat storage capacity. This is because the heat exchange capacity of the piping system determines the ability of the regenerative oxidation device to control the temperature gradient of the heat storage chamber 2.

[0056] Second Embodiment

[0057] Compared to the first embodiment, the second embodiment of the regenerative oxidation device according to the present invention has a furnace body C, a regenerator chamber 1, an oxidation chamber 2, a low-temperature regenerator section 10, a temperature regulating section 20, a high-temperature regenerator section 30, a first regenerator medium M1, and a second regenerator medium M2, all with substantially the same structure and arrangement. The difference lies in that the regenerator heat exchanger 3 in the first embodiment is a tubular heat exchanger with a piping system, where the heat exchange medium M can be a fluid or a gas. In contrast, the regenerator heat exchanger 3 in the second embodiment is a heat exchanger with a channel system, which is formed by gaps or channels created by the third regenerator medium M3 itself. The heat exchange medium M in the channel system is typically a gas. Furthermore, the locations of the heat exchange medium inlet 6 and outlet 7 of the channel system are different in the two embodiments, thus allowing the heat exchange medium M to flow unidirectionally within the channel system. To avoid repetition, this embodiment only describes the parts that differ from the first embodiment.

[0058] The term "gap or channel formed by the third heat storage medium itself" includes both the pore channels formed by the pores of the third heat storage medium M3 itself, and the gap channels left between the third heat storage medium M3 in various shapes. For example... Figure 2 As shown, silicon carbide ceramic can be used as the third heat storage medium M3 to form a solid-formed honeycomb heat storage medium containing mutually isolated exhaust gas channels and heat exchange medium channels. The position of the heat exchange medium inlet 6 is basically the same as in the first embodiment, still located near or outside the low-temperature heat storage section 10, but the heat exchange medium outlet 7 is no longer set together with the heat exchange medium inlet 6, but is set on one side of the furnace body C, for example, the side of the furnace body C. That is to say, the channel system of the heat exchanger 3 of the heat storage chamber enters the low-temperature heat storage section 10, bends after passing through the temperature regulating section 20 and the high-temperature heat storage section 30, and passes through the side of the furnace body C to reach the heat exchange medium outlet 7. Of course, the location of the heat exchange medium outlet 7 is not limited to the side of the furnace body C, and it can also be set at a location such as the top of the furnace body C.

[0059] As described above, the channel system of the heat exchanger 3 in the second embodiment is actually designed as a straight-line tube system in order to reduce the air resistance of the heat exchange medium M in the channel system, which is determined by the fact that the heat exchange medium M is a gas.

[0060] Third Embodiment

[0061] Compared to the second embodiment, the third embodiment of the regenerative oxidation device according to the present invention has a furnace body C, a regenerative chamber 1, an oxidation chamber 2, a low-temperature regenerative section 10, a temperature regulating section 20, a high-temperature regenerative section 30, a first regenerative medium M1, a second regenerative medium M2, a third regenerative medium M3, and a heat exchange medium M, all with approximately the same structure and arrangement. The difference is that the third embodiment adds an oxidation chamber heat exchanger 3' to the second embodiment, and the position of the heat exchange medium outlet 7 is also changed accordingly, with the original position becoming the intermediate inlet / outlet 7' of the heat exchange medium. By adding the oxidation chamber heat exchanger 3' to the oxidation chamber 2, the effective heat output can be increased.

[0062] like Figure 3 As shown, the spacer 8 in the first and second embodiments is modified into a hollow main channel 9, becoming part of the channel system of the heat exchanger 3 in the regenerator chamber. The channel connecting the heat exchange medium outlet 7 in the second embodiment branches from the hollow main channel 9 in the third embodiment and leads to the heat exchange medium intermediate inlet / outlet 7' located on the side of the furnace body C.

[0063] An oxidation chamber heat exchanger 3' is added inside the oxidation chamber 2. Similar to the regenerator heat exchanger 3, the oxidation chamber heat exchanger 3' consists of interconnected mesh channels, allowing the exhaust gas inside the oxidation chamber 2 to fully exchange heat with the heat exchange medium M flowing through the oxidation chamber heat exchanger 3'. After passing through the oxidation chamber heat exchanger 3', the hollow main channel 9 passes through the furnace body C from the other side (e.g., the top) to the heat exchange medium outlet 7. The various embodiments of the regenerator oxidation device listed above mainly regulate the temperature of the regenerator chamber 1 by adjusting at least one of the following parameters: the temperature T1 of the regenerator chamber temperature control sampling point 5, the oxidation chamber temperature T2, the oxidation chamber temperature change trend ΔT, the exhaust gas combustible concentration, the exhaust gas calorific value, the combustible ignition point, and the exhaust gas flow rate. The temperature T1 of the heat storage chamber temperature control sampling point can be sampled based on a single heat storage chamber temperature control sampling point 5, or based on a combination of multiple heat storage chamber temperature control sampling points. Whether it is a single heat storage chamber temperature control sampling point 5 or multiple heat storage chamber temperature control sampling points 5, they are all located within the area of ​​the high-temperature heat storage section 30 and the temperature regulation section 20.

[0064] If the temperature T1 of the heat storage chamber is sampled based on a single heat storage chamber temperature control sampling point 5, the heat storage chamber temperature control sampling point 5 can be set at the junction between the high-temperature heat storage section 30 and the temperature regulation section 20, and kept at a certain distance from the pipes of the pipeline system. The heat storage chamber temperature T1 represents the heat storage state of heat storage chamber 1, the oxidation chamber temperature T2 represents the oxidation and combustion working state of oxidation chamber 2, the difference between the two T2-T1 represents the temperature gradient of the high-temperature heat storage section 30 of heat storage chamber 1, and the temperature change trend ΔT of the oxidation chamber represents the thermal equilibrium state of oxidation chamber 2.

[0065] The heat exchange efficiency of the heat exchanger 3 in the heat storage chamber is usually adjusted by the following two methods: First, reduce the heat exchange capacity of the heat exchanger 3 so that an appropriate proportion of organic matter in the waste gas is oxidized and releases heat in the heat storage chamber 1, thereby increasing the heat output of the heat exchanger 3; Second, appropriately increase the heat exchange capacity of the heat exchanger 3 to inhibit the oxidation and heat release of organic matter in the waste gas in the heat storage chamber 1, thereby increasing the organic matter content of the waste gas entering the oxidation chamber 2.

[0066] The first method involves reducing the flow rate of heat exchange medium M to raise the temperatures of the high-temperature heat storage section 30 and the temperature regulation section 20 to a suitable range, causing partial oxidation of the combustibles in the exhaust gas and releasing heat. The flow rate of heat exchange medium M is controlled so that this portion of heat is just enough to be discharged through the heat exchanger 3 in the heat storage chamber of the temperature regulation section 20, while the remaining heat is still released within the oxidation chamber 2, maintaining a suitable temperature in the oxidation chamber 2. The temperature change trend ΔT of the oxidation chamber 2 reflects its thermal equilibrium state and serves as the basis for adjusting the flow rate of the medium in the heat storage chamber heat exchanger 3 in the control strategy.

[0067] exist Figure 1 In the first embodiment shown, an appropriate oxidation chamber temperature can be maintained without the need for a heat output device in the oxidation chamber 2. This is suitable for treating exhaust gases with low calorific value and simplifies the structure related to heat release or heat output in the regenerative oxidation device.

[0068] exist Figure 2 In the second embodiment shown, the temperature inside the oxidation chamber 2 can be increased, and the heat can be discharged through the heat output pipe of the oxidation chamber 2, making it more suitable for treating high-calorific-value waste gas. In this case, the heat can be discharged from the oxidation chamber 2 by heat exchanger or direct hot air output.

[0069] The second method, by increasing the flow rate of the heat exchange medium to maintain a lower temperature at the cold end of the high-temperature heat storage section 30, allows for a larger temperature gradient within the high-temperature heat storage section 30. This ensures that the combustibles in the exhaust gas are oxidized and release heat primarily near the high-temperature end face of the high-temperature heat storage section 30 and within the oxidation chamber 2. After the temperature of the heat storage medium at the high-temperature end face of the high-temperature heat storage section 30 rises, most of the heat can enter the oxidation chamber 2 via thermal radiation.

[0070] exist Figure 3 In the third embodiment shown, the heat exchanger 3 in the regenerator chamber and the heat exchanger 3' in the oxidation chamber operate in the following four operating states: (i) Both the heat exchanger 3 in the heat storage chamber and the heat exchanger 3' in the oxidation chamber stop operating. Under this operating condition, the heat exchange medium M stops entering and exiting, and the heat exchange medium inlet 6, the heat exchange medium outlet 7 and the intermediate inlet / outlet 7' of the heat exchange medium are all closed. (ii) The heat exchanger 3 in the heat storage chamber is running and the heat exchanger 3' in the oxidation chamber is not running. In this working state, the heat exchange medium inlet 6 is inlet, the heat exchange medium outlet 7 is outlet, and the heat exchange medium intermediate inlet / outlet 7' is closed. (iii) The heat exchanger 3 in the regenerator chamber stops operating, and the heat exchanger 3' in the oxidation chamber operates. In this operating state, the heat exchange medium inlet 6 is closed, the heat exchange medium outlet 7 is vented, and the intermediate inlet / outlet 7' of the heat exchange medium is vented; and (iv) Both the heat exchanger 3 in the heat storage chamber and the heat exchanger 3' in the oxidation chamber are in operation. Under this operating condition, the heat exchange medium inlet 6 is inlet air, the heat exchange medium outlet 7 is outlet air, and the heat exchange medium intermediate inlet / outlet 7' is inlet air or outlet air.

[0071] In summary, the regenerative oxidation device according to the present invention and the heat balance adjustment method of the regenerative oxidation chamber of the above-mentioned regenerative oxidation device have the following advantages: - Effectively solves the technical problems of excessively low oxidation temperature and overheating of heat storage chamber caused by high concentration of low ignition point combustibles in exhaust gas.

[0072] - By controlling the heat exchanger in the heat storage chamber temperature regulation section, appropriate heat is removed, so that the oxidation chamber can maintain a suitable temperature. Within a certain range, it can replace the function of heat dissipation or heat removal of the existing oxidation chamber through a specific device.

[0073] - Adapting to working conditions where the calorific value of combustibles in exhaust gas is too low: When the calorific value of exhaust gas is low enough, as long as the heat exchanger of the heat storage chamber in the temperature regulation section of the heat storage chamber stops heat export, the heat storage chamber used by this device can be restored to a normal heat storage chamber adapted to low calorific value exhaust gas.

[0074] Although the structure and working principle of the regenerative oxidation device according to the present invention, as well as the operation process of the heat balance adjustment method of the regenerative oxidation chamber of the above-described regenerative oxidation device, have been described above in conjunction with preferred embodiments and accompanying drawings, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the present invention. Therefore, modifications and variations can be made to the present invention within the spirit and scope of the claims, and all such modifications and variations will fall within the scope claimed by the claims.

Claims

1. A regenerative oxidation device, comprising a furnace body (C), the furnace body (C) being composed of a regenerative chamber (1) filled with a regenerative medium and an oxidation chamber (2) not filled with a regenerative medium, the regenerative chamber (1) comprising a low-temperature regenerative section (10) distant from the oxidation chamber (2) and filled with a first regenerative medium (M1) and a high-temperature regenerative section (30) adjacent to the oxidation chamber (2) and filled with a second regenerative medium (M2), wherein, The heat storage chamber (1) further includes a temperature regulating section (20) located between the low-temperature heat storage section (10) and the high-temperature heat storage section (30). The temperature regulating section (20) is provided with a heat storage chamber heat exchanger (3) for regulating the temperature gradient in the heat storage chamber (1). A heat storage chamber temperature control sampling point (5) is provided in the area between the high-temperature heat storage section (30) and the temperature regulating section (20) of the heat storage chamber (1).

2. The regenerative oxidation device as described in claim 1, characterized in that, The porosity of the first heat storage medium (M1) is higher than that of the second heat storage medium (M2), and the heat transfer efficiency of the first heat storage medium (M1) is higher than that of the second heat storage medium (M2).

3. The regenerative oxidation device as described in claim 1, characterized in that, The heat exchanger (3) in the heat storage chamber is a pipeline system with heat exchange capability. A third heat storage medium (M3) is filled between each pipe of the pipeline system. The heat exchange medium (M) flows in the pipeline system and exchanges heat with the third heat storage medium (M3) to regulate the temperature gradient in the heat storage chamber (1).

4. The regenerative oxidation device as described in claim 3, characterized in that, The piping system maintains a predetermined contact area with the third heat storage medium (M3) while passing through the temperature regulation section (20).

5. The regenerative oxidation device as described in claim 1, characterized in that, The heat exchanger (3) in the heat storage chamber is a channel system with heat exchange capability. When the heat exchange medium (M) is a gas, the heat exchange medium (M) flows unidirectionally in the channel formed by the third heat storage medium (M3) itself and exchanges heat with the third heat storage medium (M3) to regulate the temperature gradient in the heat storage chamber (1).

6. The regenerative oxidation device as described in claim 5, characterized in that, An oxidation chamber heat exchanger (3') is also provided inside the oxidation chamber (2), which enables the waste gas inside the oxidation chamber (2) to exchange heat with the heat exchange medium (M) flowing through the oxidation chamber heat exchanger (3').

7. The regenerative oxidation device as described in claim 6, characterized in that, The heat exchange medium (M) enters the channel system through the heat exchange medium inlet (6). After passing through the temperature regulation section (20) and the heat storage chamber heat exchanger (3), the channel system branches to the heat exchange medium intermediate inlet / outlet (7') on one hand, and to the heat exchange medium outlet (7) after passing through the oxidation chamber heat exchanger (3') on the other hand.

8. A method for adjusting the heat balance of the regenerator chamber (1) of the regenerable oxidation device as described in any one of claims 1 to 7, comprising: The heat exchange efficiency of the heat exchanger (3) is adjusted by adjusting the flow rate of the heat exchange medium based on at least one of the following parameters: temperature T1 of the heat storage chamber temperature control sampling point, temperature T2 of the oxidation chamber, temperature change trend ΔT of the oxidation chamber, concentration of combustibles in the waste gas, calorific value of the waste gas, ignition point of the combustibles, and flow rate of the waste gas.

9. The thermal balance adjustment method as described in claim 8, characterized in that, Based on the parameters, the heat exchange efficiency of the heat exchanger (3) in the heat storage chamber is adjusted to control the ratio of the amount of organic matter in the waste gas that undergoes an exothermic oxidation reaction in the heat storage chamber (1) and the oxidation chamber (2), respectively.

10. The thermal balance adjustment method as described in claim 8, characterized in that, The temperature T1 of the heat storage chamber temperature control sampling point is sampled based on one or more heat storage chamber temperature control sampling points (5).

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