A heat accumulating catalytic reactor and a coal mine ventilation air methane treatment device with the same

Abstract

The application discloses a heat accumulating catalytic reactor and a coal mine ventilation air methane treatment device with the same, and relates to the technical field of heat accumulating combustion. The heat accumulating catalytic reactor comprises a shell; the shell comprises a reaction cavity and a temperature rising cavity which are in communication with each other; a gas inlet is arranged on one side wall of the reaction cavity; a gas outlet is arranged on the side wall of the temperature rising cavity which is away from the gas inlet; a plurality of layers of hollow plates are fixedly arranged in the reaction cavity at intervals; a catalyst is arranged on each layer of the hollow plates; a temperature rising assembly is fixedly arranged in the temperature rising cavity; the coal mine ventilation air methane treatment device comprises a cavity, the heat accumulating catalytic reactor, a ventilation air methane collecting mechanism and a refrigerant pipeline; a gas inlet is arranged on one side wall of the cavity, and an exhaust port is arranged on the other side wall; the outlet end of the ventilation air methane collecting mechanism is in communication with the gas inlet and the gas inlet; the inlet end and the outlet end of the refrigerant pipeline pass through the bottom wall of the temperature rising cavity and the cavity in sequence to the outside of the cavity, the application has the advantages of simple structure, stable operation, efficient conversion of low-concentration methane, monitoring of the catalyst state and improved utilization rate of ventilation air methane.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of regenerative combustion, more particularly to a regenerative catalytic reactor and a coal mine ventilation air methane treatment device with the same. BACKGROUND

[0002] Coal mine gas is a kind of unconventional natural gas, mainly composed of methane adsorbed by coal seams. In order to ensure safety during production, most of the coal mine gas will be diluted by ventilation, so that the methane concentration is lower than the explosion limit, which is called coal mine ventilation air methane. Due to the low methane concentration (0.1-1%), it is difficult to recover, and is usually directly discharged into the atmosphere, not only causing greenhouse effect, but also causing waste of non-renewable energy. The use of catalysts can reduce the activation energy of methane and thus realize the recycling of coal mine ventilation air methane.

[0003] In conventional combustion technology, when the methane concentration in the air is lower than 5%, it cannot be ignited or maintained. Unless the ambient temperature exceeds 1000℃. The regenerative catalytic oxidation device, which accumulates reaction heat in the reactor, is the first choice in the market. Honeycomb ceramic regenerator is one of the key components of the regenerative combustion furnace commonly used in the market, which directly affects the size, thermal efficiency and heating capacity of the regenerative chamber. In the multi-chamber (two chambers and above) regenerative heating furnace, due to the large air and ventilation air methane nozzles, the mixing effect of air and natural gas flow is not ideal, which will lead to incomplete combustion. When the residual air and exhaust gas enter the narrow space of the regenerator and mix, it will cause secondary combustion and damage the honeycomb ceramic regenerator. At the same time, the traditional coal mine ventilation air methane catalytic combustion technology has the problems of low thermal efficiency, high cost and short service life of catalyst, large device area, etc.

[0004] The inventor has previously applied for a coal mine ventilation air methane phase change regenerative catalytic combustion numerical simulation analysis method and a preparation method of high-temperature phase change regenerative material, respectively: application publication number CN 115081354 A, patent name A multi-physical field coupled coal mine ventilation air methane phase change regenerative catalytic combustion numerical simulation analysis method, authorized publication number CN 106367035 B, patent name Preparation method of high-temperature phase change regenerative material with core-shell structure.

[0005] However, the method of the above-mentioned patent needs to be combined with the corresponding structure to solve the problems of low thermal efficiency, high cost and short service life of catalyst, large device area, etc. in the prior art.

[0006] Therefore, how to provide a device with simple structure and stable operation, which uses a coupling heat storage and catalysis dual-function catalyst to realize efficient conversion of low-concentration methane, monitor the state of the catalyst, and effectively regulate and control the catalyst to avoid temperature runaway and deactivation, and improve the efficient utilization rate of gas-depleted air, is a problem that needs to be solved by those skilled in the art. SUMMARY

[0007] Therefore, the present application provides a coal mine depleted air treatment device coupling heat storage and catalysis, aiming to solve the above technical problems.

[0008] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0009] A heat storage and catalytic reactor comprises a shell; the shell is divided into a reaction cavity and a temperature rising cavity which are in communication with each other from top to bottom;

[0010] One side wall of the reaction cavity is provided with a gas inlet; one side wall of the temperature rising cavity away from the gas inlet is provided with a gas outlet; a plurality of layers of hollow plates are fixedly arranged in the reaction cavity, and each layer of the hollow plates is arranged with a catalyst; and a temperature rising assembly is fixedly arranged in the temperature rising cavity.

[0011] Through the above technical solutions, the heat storage and catalytic reactor provided by the present application realizes the catalytic utilization of low-concentration methane by selecting a high-performance catalyst coupling heat storage and catalysis unit, thereby realizing high heat storage capacity, and improving the stability of the reactor by changing the existing equipment in the market from original one-stage heat storage, two-stage catalysis and three-stage heat storage to a heat storage and catalysis reactor integrating heat storage and catalysis, ensuring the activity of the catalyst, and greatly improving the problem of large floor area of multi-stage heat storage and catalytic reaction equipment in the market.

[0012] Preferably, in the heat storage and catalytic reactor, the temperature rising assembly comprises an electric heater and a heat conductor; the electric heater is installed on the inner side wall of the temperature rising cavity; and the heat conductor is in a plurality of numbers and is fixed in the temperature rising cavity. The electric heater can heat the inside of the temperature rising cavity, and the heat conductor can absorb heat and transfer it to the reaction cavity.

[0013] Preferably, in the heat storage and catalytic reactor, a temperature sensor is further included; the temperature sensor is in a plurality of groups, and each group of the temperature sensor is installed on the inner side wall of the reaction cavity and corresponds to each layer of the hollow plate. The temperature sensor is used for detecting the temperature in the reaction cavity and monitoring and feeding back the temperature in the reaction cavity in real time.

[0014] Preferably, in the above-mentioned heat accumulating catalytic reactor, a control terminal is further included, which is electrically connected with the electric heater and the temperature sensor.

[0015] Preferably, in the above-mentioned heat accumulating catalytic reactor, the shell is a column structure, and each group of the temperature sensors is multiple in number, and the multiple temperature sensors are arranged in a ring on the inner side wall of the reaction cavity.

[0016] Preferably, in the above-mentioned heat accumulating catalytic reactor, the catalyst is a high-temperature phase change heat accumulating material in a core-shell structure. The catalyst is a multi-layer particle-accumulated core-shell structure catalyst, and forms a catalyst bed layer with the hollow plate. The heat absorption melting and heat release solidification of the metal in the core of the catalyst realize the effect of heat accumulation, and couple heat accumulation and catalytic ability, so that the volume of the coal mine ventilation air methane treatment device is greatly reduced, and the heat accumulation capacity is greatly increased. The catalyst activates the methane molecules by adsorption and dissociation, reduces the ignition point of low-grade methane combustion, and then can rapidly oxidize with oxygen to generate carbon dioxide and water. The core-shell structure heat accumulating catalyst is used to activate methane molecules on one hand, and accumulates heat through phase change heat accumulation in the core of the catalyst on the other hand. Catalytic combustion helps to improve combustion efficiency, reduce combustion temperature and reduce the generation of harmful substances.

[0017] The application further provides a coal mine ventilation air methane treatment device, which comprises a cavity, the heat accumulating catalytic reactor, a ventilation air methane collecting mechanism and a refrigerant pipeline.

[0018] An air inlet is formed in one side wall of the cavity.

[0019] The heat accumulating catalytic reactor is fixed in the cavity, and the air inlet is in communication with the air inlet.

[0020] The ventilation air methane collecting mechanism is arranged outside the cavity and is in communication with the air inlet and the air inlet through a connecting pipeline.

[0021] The refrigerant pipeline is longitudinally arranged in the heating cavity and the reaction cavity, and the inlet end and the outlet end of the refrigerant pipeline pass through the bottom wall of the heating cavity and the cavity in sequence and extend to the outside of the cavity.

[0022] Preferably, in the coal mine ventilation air methane treatment device, the coolant pipeline is a U-shaped tube, the bottom wall of the cavity is provided with a first through hole and a second through hole, the bottom wall of the heating cavity is provided with a third through hole and a fourth through hole corresponding to the first through hole and the second through hole respectively, the inlet end extends to the outside of the cavity through the third through hole and the first through hole in sequence, and the outlet end extends to the outside of the cavity through the fourth through hole and the second through hole in sequence.

[0023] Preferably, in the coal mine ventilation air methane treatment device, the inlet end is connected with a supply pump through a pipeline, and the outlet end is communicated with an external energy supply mechanism.

[0024] Preferably, in the coal mine ventilation air methane treatment device, the outlet end of the ventilation air methane collecting mechanism is provided with a ventilation air methane cover, one side of the ventilation air methane cover is provided with a fourth through hole, and the connecting pipeline communicates the fourth through hole with the air inlet and the air inlet.

[0025] Preferably, in the coal mine ventilation air methane treatment device, a fan is installed inside the cavity and outside the shell, and the fan is communicated with the air outlet.

[0026] Preferably, in the coal mine ventilation air methane treatment device, the number of fans can be multiple.

[0027] Through the above technical solution, compared with the prior art, the application provides a heat accumulating catalytic reactor and a coal mine ventilation air methane treatment device with the same, which has the following beneficial effects:

[0028] 1. The core-shell structure catalyst with heat accumulating and catalytic capacity has the characteristics of wide application range, high yield, strong fault tolerance and excellent heat storage and release performance.

[0029] 2. The single particle model is established by a multi-scale coupling method, and the catalyst state of the reaction bed is monitored and effectively controlled to avoid catalyst temperature runaway and deactivation by combining experimental data.

[0030] 3、The application replaces the existing isolated heat accumulator by using the phase change heat storage catalyst combined with the multi-point monitoring catalytic reactor, greatly reduces the volume of the reactor, and solves the problem of large bed temperature gradient, and easily controls the generation of catalyst bed temperature runaway and hot spot phenomenon. In addition, the in-situ storage of reaction heat in the catalyst will also reduce heat loss, enhance heat exchange effect, and improve energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can also be obtained by the drawings provided by the person skilled in the art without creative labor.

[0032] Figure 1 The accompanying drawings are schematic structural diagrams of the heat storage catalytic reactor provided by the present application.

[0033] Figure 2 The accompanying drawings are schematic structural diagrams of the coal mine ventilation air treatment device provided by the present application.

[0034] Wherein:

[0035] 1 - shell;

[0036] 11 - reaction cavity; 12 - heating cavity; 13 - gas inlet; 14 - gas outlet; 15 - third through hole; 16 - fourth through hole;

[0037] 2 - hollow plate;

[0038] 3 - heating assembly;

[0039] 31 - electric heater; 32 - heat conductor;

[0040] 4 - temperature sensor;

[0041] 5 - cavity;

[0042] 51 - air inlet; 52 - air outlet; 53 - first through hole; 54 - second through hole; 55 - fan;

[0043] 6 - ventilation air collection mechanism;

[0044] 61 - ventilation air cover;

[0045] 7 - refrigerant pipeline;

[0046] 71 - inlet end; 72 - outlet end;

[0047] 8 - communication pipeline;

[0048] 9 - supply pump. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. Embodiment 1

[0050] Referring to the drawings, Figure 2 The embodiment of the present application discloses a heat storage catalytic reactor, which comprises a shell 1; the shell 1 is divided into a reaction cavity 11 and a temperature rising cavity 12 which are in communication with each other from top to bottom;

[0051] A gas inlet 13 is arranged on one side wall of the reaction cavity 11; a gas outlet 14 is arranged on the side wall of the temperature rising cavity 12 which is away from the gas inlet 13; a plurality of hollow plates 2 are fixed in the reaction cavity 11 at intervals, and a catalyst is arranged on each hollow plate 2; a temperature rising assembly 3 is fixed in the temperature rising cavity 12.

[0052] In order to further optimize the above technical solution, the number of layers of the hollow plate 2 can be determined according to the volume of the reaction cavity 11.

[0053] In order to further optimize the above technical solution, the temperature rising assembly 3 comprises an electric heater 31 and a heat conductor 32; the electric heater 31 is installed on the inner side wall of the temperature rising cavity 12; the number of the heat conductors 32 is multiple, and the heat conductors 32 are fixed in the temperature rising cavity 12.

[0054] In order to further optimize the above technical solution, the heat conductor 32 is a spherical structure, is made of a heat-conductive metal material, and is fixed in the temperature rising cavity 12 by a support.

[0055] In order to further optimize the above technical solution, a temperature sensor 4 is further included; the number of the temperature sensors 4 is multiple, and each group of the temperature sensors 4 is installed on the inner side wall of the reaction cavity 11 and corresponds to each of the hollow plates 2.

[0056] In order to further optimize the above technical solution, a control end is further included, and the control end is electrically connected with the electric heater 31 and the temperature sensor 4.

[0057] In order to further optimize the above technical solution, the shell 1 is a column structure, the number of each group of the temperature sensors 4 is multiple, and the multiple temperature sensors 4 are annularly arranged on the inner side wall of the reaction cavity 11.

[0058] In order to further optimize the above technical solution, the catalyst is a high-temperature phase change heat storage material with a core-shell structure.

[0059] The phase change heat storage type catalyst Al@Al2O3 has a core-shell structure, and the alumina shell is formed by surface nickel nanoparticles catalyzing the surface layer oxidation of the aluminum ball; the step-by-step oxidation process makes there be a large number of voids in the capsule, improves the elasticity of the shell layer, provides sufficient space for the volume expansion of the phase change material in the melting process, and makes the sample have high durability in the high-temperature melting / solidification cycle; the encapsulated Al@Al2O3 phase change material has a melting temperature of 660.4 DEG C and a latent heat of 315 J / g after long-term cycling.

[0060] At present, the simulation of particle accumulation fixed bed reactor is mostly simplified as a porous medium model or calculated by coupling finite element software with other software; at the same time, the multi-scale coupling method is to establish the whole single particle model and verify the model feasibility by combining relevant experimental results; the effective single particle model can be used to investigate the internal diffusion by parameter transmission between scales, and the simplified porous medium and single particle model are coupled. The research is carried out by using numerical calculation method, which has low research cost and short cycle, can control single factor for research, and can observe the change of methane volume fraction in the reaction process, the change of temperature in the reactor and the phase change process of each phase change particle. According to the method, the new heat storage catalytic reactor can monitor the temperature rise of the catalyst bed, and effectively avoid the problems such as catalyst deactivation. Example 2

[0061] Referring to the accompanying Figure 1 to the accompanying Figure 2 The embodiment provides a coal mine ventilation air methane treatment device, which comprises a cavity 5, a heat storage catalytic reactor, a ventilation air methane collecting mechanism 6 and a refrigerant pipeline 7.

[0062] An air inlet 51 is arranged on one side wall of the cavity 5; an air outlet 52 is arranged on the side wall of the cavity 5 away from the air inlet 51;

[0063] The heat storage catalytic reactor is fixed in the cavity 5, and the air inlet 13 is in communication with the air inlet 51;

[0064] The ventilation air methane collecting mechanism 6 is arranged outside the cavity 5 and is in communication with the air inlet 51 and the air inlet 13 through a connecting pipeline 8;

[0065] The refrigerant pipeline 7 is longitudinally arranged in the heating cavity 12 and the reaction cavity 11, the inlet end 71 and the outlet end 72 of the refrigerant pipeline 7 pass through the bottom wall of the heating cavity 12 and the cavity 5 in sequence and extend to the outside of the cavity 5.

[0066] In order to further optimize the above technical scheme, the refrigerant pipeline 7 is a U-shaped tube, the bottom wall of the cavity 5 is provided with a first through hole 53 and a second through hole 54; the bottom wall of the heating cavity 12 is provided with a third through hole 15 and a fourth through hole 16 corresponding to the first through hole 53 and the second through hole 54 respectively; the inlet end 71 extends to the outside of the cavity 5 through the third through hole 15 and the first through hole 53 in sequence; the outlet end 72 extends to the outside of the cavity 5 through the fourth through hole 16 and the second through hole 54 in sequence.

[0067] In order to further optimize the above technical scheme, the inlet end 71 is connected with a supply pump 9 through the pipeline; the outlet end 72 is communicated with an external energy supply mechanism.

[0068] In order to further optimize the above technical scheme, a valve is installed on the connecting pipeline 8, and the control end can also control the opening and closing of the valve and the supply pump 9.

[0069] In order to further optimize the above technical scheme, the outlet end of the exhaust air collecting mechanism 6 is provided with an exhaust air cover 61, one side of the exhaust air cover 61 is provided with a fifth through hole, and the connecting pipeline 8 communicates the fifth through hole with the air inlet 51 and the air inlet 13.

[0070] In order to further optimize the above technical scheme, a fan 55 is installed inside the cavity 5 and outside the shell 1; the fan 55 is communicated with the air outlet 14.

[0071] Embodiments of the application

[0072] The control end controls the electric heater 31 to heat the heating cavity 12, and the heat-conducting body 32 can rapidly absorb heat and quickly heat and conduct to the catalyst bed layer of the reaction cavity 11, the temperature sensor 4 detects the temperature inside the reaction cavity 11, when the temperature reaches the set temperature, the exhaust air gas is extracted into the reaction cavity 11 by the fan 55 for preheating and rectification, when the temperature reaches the gas ignition point, the heating wire of the electric heater 31 is used for ignition, the multi-layer heat storage catalyst reaction bed layer is provided, heat storage is carried out through the phase change of the catalyst core, and heat is preserved; the refrigerant medium enters through the inlet end 71 of the refrigerant pipeline 7 by the supply pump 9, and sequentially flows through the heating cavity 12 and the reaction cavity 11, the combustion heat in the reactor is taken away by the low-temperature refrigerant, and is transported to the external energy supply mechanism for recycling.

[0073] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. For the device disclosed by the embodiment, since it corresponds to the method disclosed by the embodiment, the description is relatively simple, and the related parts can be referred to the method part.

[0074] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A regenerative catalytic reactor characterized by, It comprises a shell (1); the shell (1) is divided into a reaction cavity (11) and a temperature rising cavity (12) from top to bottom; One side wall of the reaction cavity (11) is provided with an air inlet (13); one side wall of the temperature rising cavity (12) away from the air inlet (13) is provided with an air outlet (14); a plurality of layers of hollow plates (2) are fixedly arranged in the reaction cavity (11), and a catalyst is arranged on each layer of the hollow plates (2); a temperature rising assembly (3) is fixedly arranged in the temperature rising cavity (12); It further comprises a temperature sensor (4); the temperature sensor (4) is in multiple groups, and the multiple groups of temperature sensors (4) are arranged on the inner side wall of the reaction cavity (11) and correspond to each layer of the hollow plates (2) respectively; The catalyst is a high-temperature phase change heat storage material with a core-shell structure.

2. The regenerative catalytic reactor of claim 1, wherein, The temperature rising assembly (3) comprises an electric heater (31) and a heat conductor (32); the electric heater (31) is arranged on the inner side wall of the temperature rising cavity (12); the heat conductor (32) is in multiple numbers and is fixedly arranged in the temperature rising cavity (12).

3. The regenerative catalytic reactor of claim 1, wherein, The shell (1) is in a columnar structure, and the temperature sensor (4) is in multiple numbers in each group; the multiple temperature sensors (4) are arranged in a ring on the inner side wall of the reaction cavity (11).

4. A coal mine ventilation air methane treatment apparatus, characterized by, It comprises a cavity (5), the heat storage catalytic reactor of any one of claims 1-3, a waste air collecting mechanism (6) and a refrigerant pipeline (7); One side wall of the cavity (5) is provided with an air inlet (51); one side wall of the cavity (5) away from the air inlet (51) is provided with an air outlet (52); The heat storage catalytic reactor is fixedly arranged in the cavity (5), and the air inlet (13) is in communication with the air inlet (51); The waste air collecting mechanism (6) is arranged outside the cavity (5) and is in communication with the air inlet (51) and the air inlet (13) through a connecting pipeline (8); The refrigerant pipeline (7) is arranged longitudinally in the temperature rising cavity (12) and the reaction cavity (11), and an inlet end (71) and an outlet end (72) of the refrigerant pipeline (7) pass through the bottom wall of the temperature rising cavity (12) and the cavity (5) in sequence and extend to the outside of the cavity (5).

5. A coal mine ventilation air methane treatment apparatus as claimed in claim 4, wherein, The refrigerant pipeline (7) is a U-shaped tube, the bottom wall of the cavity (5) is provided with a first through hole (53) and a second through hole (54); the bottom wall of the temperature rising cavity (12) is provided with a third through hole (15) and a fourth through hole (16) corresponding to the first through hole (53) and the second through hole (54) respectively; the inlet end (71) extends to the outside of the cavity (5) through the third through hole (15) and the first through hole (53) in sequence; and the outlet end (72) extends to the outside of the cavity (5) through the fourth through hole (16) and the second through hole (54) in sequence.

6. A coal mine ventilation air methane treatment apparatus as claimed in claim 5, wherein, The inlet end (71) is connected with a supply pump (9) through a pipeline; and the outlet end (72) is in communication with an external energy supply mechanism.

7. A coal mine ventilation air methane treatment apparatus as defined in claim 4, wherein, The outlet end of the exhaust air collecting mechanism (6) is provided with an exhaust air cover (61), one side of the exhaust air cover (61) is provided with a fifth through hole, and the connecting pipeline (8) is in communication with the air inlet (51) and the air inlet (13).

8. The coal mine ventilation air methane treatment apparatus of claim 4, wherein, A fan (55) is mounted inside the cavity (5) and outside the shell (1); the fan (55) is in communication with the air outlet (14).

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