A catalytic combustion device

Abstract

The present invention discloses a catalytic combustion device, belonging to the technical field of purification of residual liquid from methanol-to-hydrogen production and hydrogen-containing waste gas. The catalytic combustion device includes a primary catalytic combustion reaction section, a secondary catalytic combustion reaction section and a gas circulation driving section. The catalytic combustion device is used for the purification treatment of residual liquid from methanol-to-hydrogen production, hydrogen-containing waste gas and the heat-conducting oil heating system. Air, hydrogen-containing waste gas, residual liquid from methanol-to-hydrogen production and methanol enter the catalytic combustion device respectively after pre-treatment. The flue gas after sufficient reaction is discharged from the air outlet. The reaction heat of the catalytic combustion device is taken out through the heat conduction of the heat-conducting oil between the heat exchange tubes in the primary catalytic combustion reaction section. The secondary catalytic combustion reaction section is an adiabatic fixed-bed structure, which can carry out deep purification treatment on the flue gas discharged from the primary catalytic combustion reaction.

Description

Technical Field

[0001] The present invention relates to the technical field of purification of residual liquid from methanol to hydrogen production and hydrogen-containing waste gas, and particularly to a catalytic combustion device. Background Art

[0002] Methanol and water vapor pass through a catalyst under certain temperature and pressure conditions. Under the action of the catalyst, a methanol cracking reaction and a carbon monoxide conversion reaction occur, generating hydrogen and carbon dioxide. This is a multi-component and multi-reaction gas-solid catalytic reaction system. The reaction equations are as follows:

[0003] CH3OH→CO+2H2

[0004] H2O+CO→CO2+H2

[0005] CH3OH+H2O→CO2+3H2

[0006] The H2 and CO2 generated by the reforming reaction are separated by pressure swing adsorption (PSA) to obtain high-purity hydrogen. The remaining tail gas (mainly containing hydrogen, carbon dioxide, trace methanol and a small amount of carbon monoxide) needs to be discharged. At the same time, the subsequent hydrogen-using process equipment will also discharge more or less excess hydrogen containing a large amount of VOCs substances.

[0007] With the country's emphasis on air pollution control, most regions in China can no longer accept the direct emission of the above gases into the atmosphere. They need to be purified and treated for organic substances and carbon monoxide before being discharged. The treatment process of the conventional method is cumbersome and complex, and it will also generate secondary pollution of waste liquid and solid waste.

[0008] In the existing methanol steam reforming to hydrogen production technology, since the raw material water is in excess, a large amount of water-containing residual liquid will be generated during the separation of the reformed gas. At the same time, certain side reactions will inevitably occur in the methanol steam reforming reaction, and there will also be impurities in the methanol raw material. These impurities exist in the above-mentioned residual liquid. If all are returned as feed, they will accumulate in the system, thereby poisoning the methanol steam reforming catalyst and shortening its service life. Therefore, the impurity concentration in the reaction system cannot be very high, and the residual liquid must be quantitatively discharged outside the reactor. If directly discharged, it will cause environmental pollution.

[0009] In the existing technology that uses catalytic combustion as a heat source, usually the first-stage catalytic combustion technology is used, and a large amount of flue gas is used for dilution to reduce the content of oxygen and combustible gases in the reactor, so that it can operate safely. In this way, the equipment is bulky, the operating efficiency is low, and it is difficult to achieve a purification effect that meets the requirements of environmental protection emission standards. Summary of the Invention

[0010] In view of this, the present invention provides a catalytic combustion device for the purification treatment of methanol-to-hydrogen residual liquid, hydrogen-containing waste gas and heat transfer oil heating system, which can meet the safety and environmental protection supervision requirements for treating methanol-to-hydrogen residual liquid and hydrogen-containing waste gas, and at the same time provide heat source for methanol-to-hydrogen production, facilitating independent construction, and thus being more suitable for practical use.

[0011] In order to achieve the above object, the technical solution of the catalytic combustion device provided by the present invention is as follows:

[0012] The catalytic combustion device provided by the present invention includes a primary catalytic combustion reaction section (2), a secondary catalytic combustion reaction section (1) and a gas circulation driving section (3).

[0013] The catalytic combustion device provided by the present invention can also be further realized by the following technical measures.

[0014] Preferably, the primary catalytic combustion reaction section (2) is a closed space formed by an upper tube sheet (2-1), a lower tube sheet (2-2), a central tube (2-3), an outer cylinder (2-4) and heat exchange tubes (2-7) provided with a catalyst filling mechanism (2-8) filled with heat transfer oil. The outer cylinder (2-4) is provided with a heat transfer oil outlet (2-5) and a heat transfer oil inlet (2-6). The mixed gas passes through the catalyst bed layer in the heat exchange tubes (2-7) from bottom to top to complete the catalytic combustion reaction.

[0015] The catalyst filling mechanism (2-8) in the heat exchange tubes (2-7) is a support spring and a plurality of commercially available honeycomb ceramic catalysts with platinum-palladium as the active component for organic waste gas purification installed thereon. The honeycomb ceramic catalysts are separated by inert materials.

[0016] Preferably, the secondary catalytic combustion reaction section (1) includes a first opening (1-5) for introducing fuel, a second opening (1-3) for introducing air, a third opening (1-4) for discharging flue gas, a catalyst filling mechanism and a gas guiding mechanism;

[0017] An opening (1-1) for introducing methanol-to-hydrogen residual liquid and methanol and an opening (1-2) for introducing hydrogen-containing waste gas are provided at the inlet end of the first opening (1-5);

[0018] The catalyst filling mechanism includes a conduit extending from the first opening (1-5) into the container, an upper head (1-6), an outer cylinder (1-7), a support mesh plate (1-11) and a granular catalyst bed layer (1-12) filled with commercially available honeycomb ceramic catalysts with platinum-palladium as the active component for organic waste gas purification.

[0019] Preferably, the air guiding mechanism is connected by an annular partition plate (1-9), a central tube (1-10), an outer cylinder (1-7) and a flange (1-8), receives the flue gas discharged from the primary catalytic combustion reaction, and is led upward through the annular gap between the central tube (1-10) and the central tube (2-3) to the top of the secondary catalytic combustion reaction section (1). The central tube (1-10) is provided with an opening connected to the second opening (1-3) to introduce air to mix with the flue gas discharged from the primary catalytic combustion reaction, and then is divided into two airflows. One airflow passes downward through the annular gap between the central tube (1-10) and the conduit extending into the container through the first opening (1-5), and then turns back upward through the catalyst bed (1-12). The flue gas after completing the secondary catalytic combustion reaction is discharged through the third opening (1-4); the other airflow turns back downward through the central tube (2-3) and mixes with the methanol hydrogen production residue liquid, methanol introduced through the opening (1-1) and the hydrogen-containing waste gas introduced through the opening (1-2), and returns to the primary catalytic combustion reaction section (2);

[0020] An opening is provided on the tube wall of the central tube (2-3) corresponding to the second opening (1-3) for introducing air, and air is directly inhaled from the second opening (1-3) to increase the oxygen content of the inlet gas for the primary catalytic combustion reaction.

[0021] Preferably, the gas circulation driving section (3) is an upper-end open container composed of a flange (3-1), an outer cylinder (3-2) and a lower head (3-3). The lower head (3-3) is provided with an opening (3-4) for installing a circulation fan (3-5), and the flange (3-1) is connected to the lower tube sheet (2-2).

[0022] Preferably, the circulation fan (3-5) is a direct-connected fan, which consists of an impeller and a motor.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The catalytic combustion device adopts a series-connected two-stage catalytic combustion reaction structure. While recovering and supplying the heat energy of the catalytic combustion reaction, it efficiently treats the methanol hydrogen production residue liquid and hydrogen-containing waste gas, so that the flue gas emission meets the requirements of VOCs on-line detection.

[0025] 2. The catalytic combustion device adopts a series-connected two-stage catalytic combustion reaction structure, and the catalyst can be preferably selected according to the requirements of different reaction types.

[0026] 3. Through the air guiding mechanism, the series-connected two-stage catalytic combustion reaction structure is integrated. The inlet of the secondary catalytic combustion reaction is directly connected to the outlet of the primary catalytic combustion reaction, and no additional temperature control components are required, and the structure of the device is simpler. Brief Description of the Drawings

[0027] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0028] Attached Figure 1 FIG. is a schematic structural diagram of a catalytic combustion device provided by an embodiment of the present invention. Specific embodiments

[0029] In view of this, the present invention provides a catalytic combustion device for the purification treatment of methanol-to-hydrogen residual liquid, hydrogen-containing waste gas, and heat transfer oil heating system, which can process methanol-to-hydrogen residual liquid and hydrogen-containing waste gas, meet the requirements of safety and environmental protection supervision, and at the same time provide heat source for methanol-to-hydrogen production, facilitating independent construction, and thus being more suitable for practical use.

[0030] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the drawings and preferred embodiments to detail the specific embodiments, structures, features, and effects of a catalytic combustion device proposed according to the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0031] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B is specifically understood as: it can simultaneously include A and B, A can exist alone, or B can exist alone, and it can have any one of the above three situations.

[0032] Refer to Attached Figure 1 , in a catalytic combustion device provided by an embodiment of the present invention, each reference numeral represents:

[0033] The secondary catalytic combustion reaction section (1) is an adiabatic fixed bed structure, and its function is to remove residual combustible substances so that the gas discharged from the secondary catalytic combustion reaction meets the requirements of VOCs on-line detection. A container with an open lower end composed of an upper head (1-6), an outer cylinder (1-7), and a flange (1-8), including a first opening (1-5) for introducing fuel, a second opening (1-3) for introducing air, a third opening (1-4) for discharging flue gas, a catalyst filling mechanism, and a gas guiding mechanism;

[0034] The inlet end of the first opening (1-5) is provided with an opening (1-1) for introducing methanol-to-hydrogen residual liquid and methanol, and an opening (1-2) for introducing hydrogen-containing waste gas;

[0035] The catalyst filling mechanism consists of a conduit extending into the container through the first opening (1-5), an upper head (1-6), an outer cylinder (1-7), a support mesh plate (1-11), and a particle catalyst bed (1-12) filled with commercially available platinum-palladium as the active component for purifying organic waste gas.

[0036] The gas guiding mechanism is connected by an annular partition plate (1-9) to the central tube (1-10), the outer cylinder (1-7), and the flange (1-8). It receives the flue gas discharged from the primary catalytic combustion reaction and is led upward through the annulus between the central tube (1-10) and the central tube (2-3) to the top of the secondary catalytic combustion reaction section (1). The central tube (1-10) is provided with an opening connected to the second opening (1-3) to introduce air to mix with the flue gas discharged from the primary catalytic combustion reaction. Then it is divided into two airflows. One airflow passes downward through the annulus between the central tube (1-10) and the conduit extending into the container through the first opening (1-5), and then turns back upward through the catalyst bed (1-12). The flue gas after completing the secondary catalytic combustion reaction is discharged through the third opening (1-4). The other airflow turns back downward through the central tube (2-3) and mixes with the methanol reforming hydrogen production residue liquid and methanol introduced through the opening (1-1) and the hydrogen-containing waste gas introduced through the opening (1-2), and then returns to the primary catalytic combustion reaction section (2).

[0037] An opening is provided on the tube wall of the central tube (2-3) at the position corresponding to the second opening (1-3) for introducing air, and air is directly inhaled from the second opening (1-3) to increase the oxygen content of the inlet gas for the primary catalytic combustion reaction.

[0038] The primary catalytic combustion reaction section (1) is a constant-temperature fixed-bed structure, which functions to enable the combustible substances to fully react and release a large amount of heat energy, which is carried out through the inter-tube heat-conducting oil heat exchanger. A closed space composed of an upper tube sheet (2-1), a lower tube sheet (2-2), a central tube (2-3), an outer cylinder (2-4), and heat exchange tubes (2-7) provided with a catalyst filling mechanism (2-8) is filled with heat-conducting oil. The outer cylinder (2-4) is provided with a heat-conducting oil outlet (2-5) and a heat-conducting oil inlet (2-6).

[0039] The catalyst filling mechanism (2-8) in the heat exchange tube (2-7) is a support spring and a plurality of honeycomb ceramic catalysts with commercially available platinum-palladium as the active component for purifying organic waste gas installed thereon. The honeycomb ceramic catalysts are separated by inert materials such as Raschig rings to strengthen mixing and heat dissipation, avoiding continuous installation to form high temperatures that may burn out the catalysts. The mixed gas passes upward through the catalyst bed in the heat exchange tube (2-7) to complete the catalytic combustion reaction. The reactant concentration is high and the heat release is large at the lower part of the catalyst bed of the catalytic combustion reaction, and it exchanges heat with the liquid-phase heat-conducting oil, which helps with heat dissipation.

[0040] The function of the gas circulation driving section (3) is to suck in the liquid or vaporized methanol hydrogen production residual liquid, methanol, hydrogen-containing waste gas, and the flue gas discharged from the first-stage catalytic combustion reaction section (2) with air incorporated through the central pipe (2-3), increase the pressure, and make it pass upward through the heat exchange pipe (2-7) provided with a catalyst filling mechanism (2-8). It is an upper-end open container composed of a flange (3-1), an outer cylinder (3-2), and a lower head (3-3). The lower head (3-3) is provided with an opening (3-4) for installing a circulation fan (3-5). The flange (3-1) is connected to the lower tube sheet (2-2). The circulation fan (3-5) is a direct-connected fan, consisting of an impeller and a motor.

[0041] Process description

[0042] After the methanol hydrogen production residual liquid and methanol are quantitatively pressurized by a metering pump, they are heated and vaporized by exchanging heat with the flue gas discharged from the third opening (1-4) of the catalytic combustion device under the protection of a nitrogen gas stream, and flow into the catalytic combustion device by gravity from the opening (1-1);

[0043] After the hydrogen-containing waste gas is collected, buffered, and metered, it is heated and the temperature is increased by exchanging heat with the flue gas discharged from the third opening (1-4) of the catalytic combustion device, and is evenly introduced into the catalytic combustion device from the opening (1-2);

[0044] After the air is quantitatively pressurized by a Roots blower and the temperature is increased by exchanging heat with the flue gas discharged from the third opening (1-4) of the catalytic combustion device, it enters the catalytic combustion device from the second opening (1-3);

[0045] The above three streams of material enter the catalytic combustion device. The flue gas after sufficient reaction is discharged from the third opening (1-4), and then exchanges heat with the feed material stream to recover heat.

[0046] The first-stage catalytic combustion reaction section (2) of the catalytic combustion device is a constant-temperature fixed bed structure, and the reaction heat is taken out by cooling with heat-conducting oil to maintain a constant temperature. The second-stage catalytic combustion reaction section (1) is an adiabatic fixed bed structure, and the reaction heat is taken out by the temperature rise of the reaction medium, and the cold medium enters and the hot medium is discharged.

[0047] One of the technical problems to be solved by the solution is to realize heat energy recovery and supply.

[0048] To achieve the above purpose, a catalytic combustion device is used. The catalytic combustion device is provided with an inlet for methanol hydrogen production residual liquid and methanol, an inlet for hydrogen-containing waste gas, an inlet for air, an outlet for flue gas after reaction, as well as an inlet and an outlet for heat-conducting oil.

[0049] Adopt a two-stage catalytic combustion reaction process technology, in which the first-stage catalytic combustion reaction is used for heat energy recovery and supply, and the second-stage catalytic combustion reaction is used for the re-treatment of the flue gas discharged from the first-stage catalytic combustion reaction. The first-stage catalytic combustion reaction section (2) of the catalytic combustion device is of a shell-and-tube structure, with heat-conducting oil filled between the tubes, and multiple commercially available honeycomb ceramic catalysts are installed in the tubes. The honeycomb ceramic catalysts are separated by inert materials such as Raschig rings to increase the heat dissipation area and avoid continuous installation from forming high temperatures that burn out the honeycomb ceramic catalysts. The mixed gas flows upward through the honeycomb ceramic catalyst bed. In this way, the reactant concentration is high and the heat release is large, occurring in the lower part of the honeycomb ceramic catalyst bed, where it is close to the heat-conducting oil inlet and the heat-conducting oil temperature is low, which helps with heat dissipation. In the first-stage catalytic combustion reaction section (2), the combustible substances fully react, and at the same time, a large amount of heat energy is released and taken out through the heat-conducting oil heat exchange between the tubes. The oxygen content in the mixed gas is controlled below 8%, and the reaction temperature is 150 - 450 °C.

[0050] The second technical problem to be solved by the solution is to treat the residual liquid and hydrogen-containing waste gas from methanol-to-hydrogen production, and the finally discharged gas meets the requirements of VOCs on-line detection.

[0051] Adopt a two-stage catalytic combustion reaction process technology, in which the first-stage catalytic combustion reaction is used for heat energy recovery and supply, and the second-stage catalytic combustion reaction is used for the re-treatment of the flue gas discharged from the first-stage catalytic combustion reaction. The second-stage catalytic combustion reaction section (1) of the catalytic combustion device is of an adiabatic fixed-bed structure. After the reaction in the first-stage catalytic combustion reaction section (2), the concentration of combustible gas in the flue gas is already very low, and its content is judged by the temperature rise at the inlet and outlet of the second-stage catalytic combustion reaction section (1), and the temperature rise at the inlet and outlet is required to be below 150 °C. The flue gas after full reaction in the first-stage catalytic combustion reaction section (2) is safely mixed with air through a pipeline. After mixing, a part of it is sent to the first-stage catalytic combustion reaction section (2) by the circulating fan; the other part of the gas flows upward through the second-stage catalytic combustion reaction section (1) to remove the residual combustible substances, so that the gas discharged from the second-stage catalytic combustion reaction meets the requirements of VOCs on-line detection. The oxygen content in the mixed gas is controlled above 3%, and the reaction temperature is 300 - 600 °C.

[0052] Furthermore, the catalytic combustion device adopts a two-stage catalytic combustion reaction structure in series, and catalysts can be preferably selected according to different reaction type requirements. The first-stage catalytic combustion reaction section (2) uses a catalyst with a noble metal content of 0.03%, and the second-stage catalytic combustion reaction section (1) uses a catalyst with a noble metal content of 0.05%. If the first-stage catalytic combustion reaction section (2) uses a catalyst with a high noble metal content, the reaction area will be concentrated in a very small area range, and the heat is difficult to be quickly transferred to the heat-conducting oil between the tubes, easily forming local high temperatures and affecting the catalyst life. In severe cases, the equipment will be burned out. Since the reaction heat in the second-stage catalytic combustion reaction section (1) is carried out by the reaction medium and there is no need to worry about local overheating, a catalyst with a high noble metal content can be used.

[0053] The third technical problem to be solved by the solution is the integrated device structure.

[0054] The catalytic combustion device makes the two series-connected catalytic combustion reaction sections organically connected through the air guiding mechanism. After the flue gas discharged from the first-stage catalytic combustion reaction section (2) is mixed with air to meet the oxygen distribution requirements of the second-stage catalytic combustion reaction section (1), it is divided into two airflows. One of the airflows passes through the second-stage catalytic combustion reaction section (1) for catalytic oxidation reaction, and reacts fully under higher temperature and oxygen content conditions to remove the remaining combustible substances, so that the discharged flue gas is purified. The other airflow is sucked into the central pipe (2-3) by the circulation fan, and is mixed with liquid or vaporized methanol hydrogen production residual liquid, methanol, and hydrogen-containing waste gas; then it passes through the air inlet bypass, and further sucks in air so that the oxygen content of the mixed gas meets the oxygen distribution requirements of the first-stage catalytic combustion reaction section (2). After being pressurized by the circulation fan, it passes through the catalyst bed of the first-stage catalytic combustion reaction section (2) from bottom to top for catalytic oxidation reaction, and after full reaction, it realizes cyclic operation through the air guiding mechanism.

[0055] Furthermore, since the catalyst with a low noble metal content has a relatively high activation temperature, the temperature of the catalyst bed needs to be preheated to 150 °C when the device is started. The usual method is to use the electric heating method to achieve this. The catalytic combustion device realizes this through the internal circulation operation of the circulation fan in the gas circulation drive section (3). At this time, all inlets of the device are closed, and the outlet of the device is kept unblocked. Starting the circulation fan can raise the temperature of the catalyst bed to 80-120 °C, and then methanol is input at 0.5-2% of the normal feed rate, which can accelerate the time for the temperature of the catalyst bed to reach 150 °C. After the temperature of the catalyst bed reaches 150 °C, the input amounts of fuel and air are gradually increased to enter a stable working state.

[0056] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A catalytic combustion device, characterized in that, There are successively arranged from bottom to top a gas circulation driving section (3), a primary catalytic combustion reaction section (2), and a secondary catalytic combustion reaction section (1); The primary catalytic combustion reaction section (2) includes a first central tube (2-3), heat exchange tubes (2-7), and a catalyst filling mechanism (2-8); The secondary catalytic combustion reaction section (1) includes a first opening (1-5) for introducing fuel, a second opening (1-3) for introducing air, a third opening (1-4) for discharging flue gas, a catalyst filling mechanism, and a gas guiding mechanism; An opening (1-1) for introducing methanol reforming residual liquid and methanol, and an opening (1-2) for introducing hydrogen-containing waste gas are provided at the inlet end of the first opening (1-5); The gas guiding mechanism is connected by an annular partition plate (1-9), a second central tube (1-10), a first outer cylinder (1-7), and a first flange (1-8), and receives the flue gas discharged from the primary catalytic combustion reaction, and is led upward through the annular gap between the second central tube (1-10) and the first central tube (2-3) to the top of the secondary catalytic combustion reaction section (1). The second central tube (1-10) is provided with an opening connected to the second opening (1-3) to introduce air to mix with the flue gas discharged from the primary catalytic combustion reaction, and then is divided into two airflows. One airflow passes downward through the annular gap between the second central tube (1-10) and the conduit extending into the container of the first opening (1-5), and then turns back upward through the catalyst bed (1-12). The flue gas after completing the secondary catalytic combustion reaction is discharged through the third opening (1-4); the other airflow turns back downward through the first central tube (2-3) and mixes with the methanol reforming residual liquid and methanol introduced through the opening (1-1) and the hydrogen-containing waste gas introduced through the opening (1-2), and returns to the primary catalytic combustion reaction section (2); An opening is provided on the tube wall of the first central tube (2-3) corresponding to the second opening (1-3) for introducing air, and air is directly inhaled from the second opening (1-3) to increase the oxygen content of the inlet gas for the primary catalytic combustion reaction; The function of the gas circulation driving section (3) is to inhale the liquid or vaporized methanol reforming residual liquid and methanol, hydrogen-containing waste gas, and the flue gas discharged from the primary catalytic combustion reaction section (2) with air added through the first central tube (2-3), pressurize it, and make it pass upward through the heat exchange tubes (2-7) provided with the catalyst filling mechanism (2-8).

2. The catalytic combustion device according to claim 1, characterized in that, The primary catalytic combustion reaction section (2) is filled with heat transfer oil in a closed space formed by an upper tube sheet (2-1), a lower tube sheet (2-2), a second outer cylinder (2-4), and heat exchange tubes (2-7) provided with a catalyst filling mechanism (2-8). The second outer cylinder (2-4) is provided with a heat transfer oil outlet (2-5) and a heat transfer oil inlet (2-6). The mixed gas passes upward through the catalyst bed in the heat exchange tubes (2-7) to complete the catalytic combustion reaction; The catalyst filling mechanism (2-8) in the heat exchange tubes (2-7) is a support flange spring and multiple commercially available honeycomb ceramic catalysts with platinum-palladium as the active component for organic waste gas purification installed thereon. The honeycomb ceramic catalysts are separated by inert materials.

3. The catalytic combustion device according to claim 1, characterized in that, The catalyst filling mechanism includes a conduit with a first opening (1-5) extending into the container, an upper head (1-6), a first outer cylinder (1-7), a support mesh plate (1-11), and a granular catalyst bed layer (1-12) filled with commercially available platinum-palladium as the active component for organic waste gas purification.

4. The catalytic combustion device according to claim 1, characterized in that, The gas circulation driving section (3) is an upper-end open container composed of a second flange (3-1), a third outer cylinder (3-2), and a lower head (3-3). The lower head (3-3) is provided with an opening (3-4) for installing a circulation fan (3-5), and the second flange (3-1) is connected to the lower tube sheet (2-2).

5. The catalytic combustion device according to claim 4, characterized in that, The circulation fan (3-5) is a direct-connected fan, consisting of an impeller and a motor.

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