Low concentration gas oxidation furnace

Abstract

This utility model relates to the field of gas oxidation technology and discloses a low-concentration gas oxidation furnace. The furnace includes a housing with an inlet pipe fixedly connected to the bottom. One end of the inlet pipe, located inside the housing, is fixedly connected to a flared opening. The housing contains a mixing assembly for mixing oxygen and gas, and the side walls of the housing are equipped with heating assemblies for oxidizing the mixed gas. This low-concentration gas oxidation furnace utilizes the synergistic effect of vertical blades, spiral blades, and a flared hood to force oxygen and gas into a swirling mixture before entering the reaction zone, improving gas mixing uniformity and avoiding the problems of oxygen concentration on one side and asymmetrical gas distribution in traditional side-inlet designs. This fundamentally eliminates localized oxygen enrichment or deficiency. The multi-layered reaction chambers, combined with the uniform flow design of the gas distribution plate, ensure uniform gas distribution within each reaction chamber.

Description

Technical Field

[0001] This utility model relates to the field of gas oxidation technology, specifically a low-concentration gas oxidation furnace. Background Technology

[0002] A gas oxidation unit is a comprehensive energy utilization device that converts low-concentration gas into heat energy through catalytic or high-temperature oxidation reactions. By controlling the temperature, flow rate, and mixing ratio of the oxidation reaction, the unit ensures that the gas is fully combusted or oxidized within a safe concentration range, thereby releasing a large amount of heat. The heat energy generated by the system can be efficiently converted into saturated steam, superheated steam, or hot air according to process requirements, achieving cascaded utilization and regeneration of energy.

[0003] According to a public announcement of a gas oxidation device (Announcement No.: CN222391441U), the above application includes a base, a box body on the base, an air inlet pipe at the lower end of the box body, an air outlet pipe at the top, multiple reaction chambers arranged from top to bottom inside the box body, multiple heat-conducting balls inside the reaction chambers, an oxygen supply box on the left side of the box body connected to an oxygen tank, multiple oxygen inlets arranged from top to bottom on the left side wall of the box body, a gas equalization plate arranged near the bottom plate of the box body, multiple air vents arranged on the gas equalization plate, and a gas equalization fan arranged below the gas equalization plate.

[0004] However, in actual use, the oxygen enters from one side of the chamber and mixes with the gas entering from the bottom. This results in a higher oxygen concentration near the intake side and a lower oxygen concentration away from the intake side. The gas oxidation reaction is uneven, the gas distribution is asymmetrical, the overall heat output is lower than the theoretical value, and the heat distribution is uneven, affecting the stability of steam or hot air parameters. In view of this, we propose a low-concentration gas oxidation furnace. Utility Model Content

[0005] The purpose of this invention is to provide a low-concentration gas oxidation furnace to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-concentration gas oxidation furnace, comprising a box body, an air inlet pipe fixedly connected to the bottom of the box body, a flared end fixedly connected to one end of the air inlet pipe inside the box body, an exhaust port fixedly connected to the top end face of the box body, a gas equalization plate fixedly connected to the inner wall of the box body, a mixing component for mixing oxygen and gas being provided inside the box body, and a heating component for heating and oxidizing the mixed gas being provided on the side wall of the box body.

[0007] Preferably, the mixing assembly includes an air intake hood fixedly connected to the outer wall of the housing, an oxygen supply pipe fixedly connected to the side wall of the air intake hood, an air inlet on the side wall of the housing, a reaction chamber fixedly connected to the inner wall of the housing, a vertical blade rotatably connected to the top of the reaction chamber, a support rod fixedly connected to the side wall of the vertical blade, a mixing pipe fixedly connected to the end face of the support rod, a horn cover fixedly connected to the end face of the mixing pipe, and a spiral blade rotatably connected to the inner wall of the mixing pipe.

[0008] Preferably, the reaction chambers and vertical blades are arranged in several groups, with the vertical blades located between two groups of reaction chambers. Oxygen enters the chamber through the air inlet, and the oxygen drives the vertical blades to rotate, so that the oxygen and gas are fully mixed.

[0009] Preferably, the heating assembly includes a housing fixedly connected to the outer wall of the box, a partition fixedly connected to the inner wall of the housing, a heating rod fixedly connected to the top of the partition, an air inlet on the side wall of the box, and an air outlet on the side wall of the box.

[0010] Preferably, the inlet and outlet are located between the two reaction chambers, and the heating rod is located between the inlet and outlet to heat the mixed gas.

[0011] Preferably, a baffle plate is rotatably connected to the bottom of the air distribution plate. The baffle plate is arranged in a spiral shape and is positioned directly above the horn opening.

[0012] Preferably, the horn cover has a large-diameter end and a small-diameter end, with the small-diameter end located on the side near the mixing tube, so that the gas flow rate increases after entering the mixing tube.

[0013] Preferably, the gas distribution plate and the end face of the reaction chamber are provided with through holes, and the interior of the reaction chamber is provided with heat-conducting balls.

[0014] Compared with the prior art, this utility model provides a low-concentration gas oxidation furnace, which has the following beneficial effects:

[0015] 1. This low-concentration gas oxidation furnace, through the coordinated action of its mixing components, vertical blades, spiral blades, and horn-shaped hood, enables forced swirling mixing of oxygen and gas before they enter the reaction zone. This improves the uniformity of gas mixing and avoids the problems of oxygen concentration on one side and asymmetrical gas distribution in traditional side-inlet designs. It fundamentally eliminates local oxygen enrichment or deficiency. The multi-layer reaction chambers, combined with the uniform flow design of the gas distribution plate, ensure that the gas is evenly distributed in each reaction chamber. The heating components heat the mixed gas through heating rods and reintroduce the hot air into the reaction zone, forming a closed thermal circulation structure within the system. This improves energy utilization, reduces the energy consumption of electric heating, and reduces the emission of unburned gas, achieving the dual effects of energy saving and environmental protection.

[0016] 2. In this low-concentration gas oxidation furnace, the airflow passing through the baffles has a more uniform velocity distribution before entering the through-holes of the gas equalization plate. The local flow difference is weakened, forming a stable rotating flow field. When oxygen enters the chamber from the inlet and meets the gas in the area above the gas equalization plate, the airflow has swirling motion characteristics and can quickly form a three-dimensional mixture with the oxygen, which enhances the contact area and mass transfer rate required for the oxidation reaction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the box body of this utility model;

[0019] Figure 3 This utility model Figure 2 Schematic diagram of the structure of region A in the middle;

[0020] Figure 4 This is a schematic diagram of the spoiler structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the spiral blade structure of this utility model.

[0022] In the diagram: 1. Box body; 2. Inlet pipe; 3. Trumpet mouth; 4. Exhaust port; 5. Gas distribution plate; 6. Mixing assembly; 601. Inlet hood; 602. Oxygen supply pipe; 603. Inlet; 604. Reaction chamber; 605. Vertical blade; 606. Support rod; 607. Mixing pipe; 608. Trumpet hood; 609. Spiral blade; 7. Heating assembly; 701. Shell; 702. Partition plate; 703. Heating rod; 704. Inlet end; 705. Outlet end; 8. Baffle plate. Detailed Implementation

[0023] like Figures 1-5As shown, this utility model provides a technical solution: a low-concentration gas oxidation furnace, including a box body 1, an air inlet pipe 2 fixedly connected to the bottom of the box body 1, a flared mouth 3 fixedly connected to one end of the air inlet pipe 2 inside the box body 1, an exhaust port 4 fixedly connected to the top end face of the box body 1, a gas equalization plate 5 fixedly connected to the inner wall of the box body 1, a mixing component 6 for mixing oxygen and gas is provided inside the box body 1, and a heating component 7 for heating and oxidizing the mixed gas is provided on the side wall of the box body 1.

[0024] In one embodiment of this utility model, the mixing component 6 includes an air inlet hood 601 fixedly connected to the outer wall of the housing 1, an oxygen supply pipe 602 fixedly connected to the side wall of the air inlet hood 601, an air inlet 603 opened on the side wall of the housing 1, a reaction chamber 604 fixedly connected to the inner wall of the housing 1, a vertical blade 605 rotatably connected to the top of the reaction chamber 604, a support rod 606 fixedly connected to the side wall of the vertical blade 605, a mixing pipe 607 fixedly connected to the end face of the support rod 606, a horn cover 608 fixedly connected to the end face of the mixing pipe 607, and a rotatable horn cover 608 fixedly connected to the end face of the mixing pipe 607. The reaction chamber 604 is connected to a spiral blade 609. Several sets of vertical blades 605 are arranged. The vertical blades 605 are located between two sets of reaction chambers 604. Oxygen enters the chamber 1 through the air inlet 603. The oxygen drives the vertical blades 605 to rotate, so that the oxygen and gas are fully mixed. The horn cover 608 is provided with a large diameter end and a small diameter end. The small diameter end is located on the side close to the mixing pipe 607, so that the gas flow rate is accelerated after entering the mixing pipe 607. The gas distribution plate 5 and the end face of the reaction chamber 604 are provided with through holes. The interior of the reaction chamber 604 is provided with heat-conducting balls.

[0025] The heating assembly 7 includes a housing 701 fixedly connected to the outer wall of the housing 1. A partition 702 is fixedly connected to the inner wall of the housing 701. A heating rod 703 is fixedly connected to the top of the partition 702. An air inlet 704 and an air outlet 705 are provided on the side wall of the housing 1. The air inlet 704 and the air outlet 705 are located between two sets of reaction chambers 604. The heating rod 703 is located between the air inlet 704 and the air outlet 705 and heats the mixed gas.

[0026] During operation, low-concentration methane gas first enters the chamber 1 through the inlet pipe 2. As the methane gas flows through the gas equalization plate 5 located on the inner wall of the chamber 1, it is evenly divided into multiple dispersed airflows by the multiple through-holes on the gas equalization plate 5, thus forming a uniformly rising gas flow field. Oxygen enters the inlet hood 601 through the oxygen supply pipe 602 and then enters the chamber 1 through the inlet 603. When oxygen flows in, it impacts the vertical blades 605, causing them to rotate around their axis. The rotation of the vertical blades 605 further drives the mixing pipe 607, which is fixedly connected to it, to rotate synchronously. When the mixing pipe 607 moves, methane gas and oxygen enter the mixing pipe 607 through the small-diameter end. The flow velocity is increased by the contraction of the horn structure, driving the spiral blades 609 to rotate. The spiral blades 609 generate a vortex effect, causing the gas and oxygen entering the mixing pipe to... The gas and oxygen in pipe 607 are fully mixed inside the pipe. The mixed gas flows out through the gap between the mixing pipe 607 and the vertical blade 605 and enters the reaction chamber 604. Through the synergistic effect of the vertical blade 605, the spiral blade 609 and the horn cover 608, the oxygen and gas are forced to swirl and mix before entering the reaction zone, which improves the uniformity of gas mixing and avoids the problem of oxygen concentration on one side and asymmetrical gas distribution in traditional side-entry oxygen design. It fundamentally eliminates the phenomenon of local oxygen enrichment or hypoxia. The multi-layer reaction chamber 604, together with the flow uniform design of the gas equalization plate 5, makes the gas evenly distributed in each layer of reaction chamber 604. The setting of the heat conduction ball conducts and balances the heat, avoiding the formation of local high temperature areas, thereby ensuring the stability and continuity of the oxidation reaction and improving the thermal energy conversion efficiency.

[0027] When the vertical blade 605 rotates continuously, in addition to driving the mixing component 6 to operate, it can also push the air inside the housing 1 into the air inlet 704 of the heating component 7. After the mixed gas is heated by the heating rod 703 inside the housing 701, it flows back into the housing 1 through the air outlet 705. After circulating mixing, heating and oxidation reaction in the multi-layer reaction chamber 604, the gas in the gas is fully oxidized, generating heat energy and releasing it as high-temperature flue gas, which is finally discharged through the exhaust port 4 at the top of the housing 1. The heating component 7 heats the mixed gas through the heating rod 703 and reintroduces the hot air into the reaction zone, so that the system forms a closed thermal cycle structure, which improves the energy utilization rate, reduces the energy consumption of electric heating, and reduces the emission of unburned gas, achieving the dual effects of energy saving and environmental protection.

[0028] In addition, a baffle plate 8 is rotatably connected to the bottom of the gas equalization plate 5. The baffle plate 8 is arranged in a spiral shape and is located directly above the horn mouth 3. When the gas enters the box 1 through the horn mouth 3, it first impacts the spiral baffle plate 8 located directly above it. Under the guidance of the baffle plate 8, the gas flow generates rotation and stratification shearing effects, which transforms the originally straight upward airflow into a spiral upward flow with swirling components. Since the baffle plate 8 can rotate freely under the impact of the airflow, it further enhances the disturbance and turbulence of the flow field. Before the airflow passes through the baffle plate 8 and enters the through hole of the gas equalization plate 5, the flow velocity distribution is more uniform, the local flow difference is weakened, and a stable rotating flow field is formed. At this time, when the oxygen enters the box 1 from the air inlet 603 and meets the gas in the area above the gas equalization plate 5, because the airflow has swirling motion characteristics, it can quickly form a three-dimensional mixture with the oxygen, which enhances the contact area and mass transfer rate required for the oxidation reaction.

[0029] In this invention, during use, low-concentration methane gas is introduced into the housing 1 through the air inlet pipe 2. The methane gas is diverted by the gas distribution plate 5 to form a uniform upward airflow. Oxygen enters through the oxygen supply pipe 602 and drives the vertical blades 605 to rotate, causing the mixing pipe 607 and the spiral blades 609 to generate a swirling flow, ensuring that the methane gas and oxygen are fully mixed before entering the reaction chamber 604 for oxidation. The multi-layer reaction chamber 604, in conjunction with the heat-conducting sphere, achieves uniform heat conduction and prevents localized high temperatures. The heating component 7 preheats the mixed gas through the heating rod 703 and circulates it back, improving the reaction temperature and combustion stability. This device provides uniform mixing, thorough oxidation, and high thermal energy utilization, eliminating localized oxygen-rich or oxygen-deficient phenomena, and reducing energy consumption and emissions.

[0030] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A low-concentration gas oxidation furnace, comprising a housing (1), wherein an air inlet pipe (2) is fixedly connected to the bottom of the housing (1), a flared end (3) is fixedly connected to one end of the air inlet pipe (2) inside the housing (1), an exhaust port (4) is fixedly connected to the top end face of the housing (1), and a gas equalization plate (5) is fixedly connected to the inner wall of the housing (1), characterized in that: The interior of the box (1) is provided with a mixing component (6) for mixing oxygen and gas, and the side wall of the box (1) is provided with a heating component (7) for heating and oxidizing the mixed gas.

2. The low-concentration gas oxidation furnace according to claim 1, characterized in that: The mixing assembly (6) includes an air intake hood (601) fixedly connected to the outer wall of the housing (1), an oxygen supply pipe (602) fixedly connected to the side wall of the air intake hood (601), an air inlet (603) opened on the side wall of the housing (1), a reaction chamber (604) fixedly connected to the inner wall of the housing (1), a vertical blade (605) rotatably connected to the top of the reaction chamber (604), a support rod (606) fixedly connected to the side wall of the vertical blade (605), a mixing pipe (607) fixedly connected to the end face of the support rod (606), a horn cover (608) fixedly connected to the end face of the mixing pipe (607), and a spiral blade (609) rotatably connected to the inner wall of the mixing pipe (607).

3. A low-concentration gas oxidation furnace according to claim 2, characterized in that: The number of reaction chambers (604) and vertical blades (605) is set in several groups, with the vertical blades (605) located between two groups of reaction chambers (604).

4. A low-concentration gas oxidation furnace according to claim 1, characterized in that: The heating assembly (7) includes a housing (701) fixedly connected to the outer wall of the box (1), a partition (702) fixedly connected to the inner wall of the housing (701), a heating rod (703) fixedly connected to the top of the partition (702), an air inlet (704) and an air outlet (705) opened on the side wall of the box (1).

5. A low-concentration gas oxidation furnace according to claim 4, characterized in that: The air inlet (704) and air outlet (705) are located between the two reaction chambers (604), and the heating rod (703) is located between the air inlet (704) and air outlet (705).

6. A low-concentration gas oxidation furnace according to claim 1, characterized in that: The bottom of the air distribution plate (5) is rotatably connected to a baffle plate (8), which is spirally arranged and positioned directly above the horn mouth (3).

7. A low-concentration gas oxidation furnace according to claim 2, characterized in that: The horn cover (608) is provided with a large diameter end and a small diameter end, with the small diameter end located on the side near the mixing pipe (607).

8. A low-concentration gas oxidation furnace according to claim 2, characterized in that: The gas equalization plate (5) and the reaction chamber (604) have through holes on their end faces, and the reaction chamber (604) is provided with heat-conducting balls inside.

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