A gas premixing distributor

Abstract

The present invention discloses a gas premixing distributor, which includes a gas injection cylinder section for gas injection and a cone diffusion cylinder section for gas mixing and discharging. The lower end of the gas injection cylinder section serves as an air inlet, and the outlet of the gas injection cylinder section is communicated with the small end of the cone diffusion cylinder section. A swirl plate assembly for gas disturbance and mixing is arranged at the junction of the gas injection cylinder section and the cone diffusion cylinder section. A combustion-supporting gas inlet pipe and an exhaust gas inlet pipe are arranged tangentially on the gas injection cylinder section, and the combustion-supporting gas inlet pipe and the exhaust gas inlet pipe are located at different height positions of the gas injection cylinder section. The structure of the present invention is simple, easy to manufacture, has a small air flow resistance, can effectively mix three inlet gases relatively uniformly, has a turbulent disturbance function, and has a wide application range.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas combustion premixing, and particularly relates to a gas premixing distributor. Background Art

[0002] In engineering projects, for existing waste gas combustion equipment, the existing equipment requires a combustion temperature of about 1200 °C, which requires controlling the ratio of waste gas, combustion-supporting gas, and air. In the past, most engineering projects only controlled the ratio of the three by the intake air volume, while ignoring the problem of uniform mixing of the three gas streams. Because of the uneven mixing, the combustion treatment effect of the waste gas is affected. Summary of the Invention

[0003] Technical Objective: Aiming at the problem of uneven mixing of the three gas streams in the existing equipment, the present invention adopts a gas premixing distributor that can uniformly mix the three gas streams before the equipment combustion and finally distribute them relatively evenly on the surface of the burner.

[0004] Technical Solution: To achieve the above technical objective, the present invention adopts the following technical solution:

[0005] A gas premixing distributor includes a gas injection cylinder section for gas injection and a cone diffusion cylinder section for gas mixing and discharge. The lower end of the gas injection cylinder section serves as an air inlet, and the outlet of the gas injection cylinder section is communicated with the small end of the cone diffusion cylinder section. A swirl plate assembly for gas disturbance and mixing is provided at the junction of the gas injection cylinder section and the cone diffusion cylinder section. A combustion-supporting gas inlet pipe and an exhaust gas inlet pipe are tangentially arranged on the gas injection cylinder section along the tangential direction, and the combustion-supporting gas inlet pipe and the exhaust gas inlet pipe are at different height positions on the gas injection cylinder section.

[0006] Preferably, the combustion-supporting gas inlet pipe of the present invention adopts a coiled pipe, the outer ring of the coiled pipe is tangent to the edge of the gas injection cylinder section, a supporting angle steel for support is provided on the inner wall of the gas injection cylinder section below the coiled pipe, the coiled pipe and the supporting angle steel are fixed by U-shaped pipe clamps and nuts, the end of the coiled pipe is blocked by welding, and exhaust holes are provided on the upper surface of the coiled pipe.

[0007] Preferably, the aperture of the exhaust hole of the present invention is simulated and designed according to the intake flow rate of the combustion-supporting gas. The aperture of the exhaust hole gradually increases according to the distance from the intake port of the combustion-supporting gas inlet pipe. The number of exhaust holes is preferably 8. The apertures of the 8 holes on the coiled pipe are controlled according to the distance from near to far to ensure that the internal micro-positive pressure injection of the pipe and the aperture of the long-distance hole is greater than that of the short-distance hole as the distance from the intake port of the opening is different, so as to ensure that the air flow of each hole is as uniform as possible during simulation.

[0008] Preferably, a sealing plate for preventing air leakage is provided at the outlet end of the exhaust gas inlet pipe of the present invention. The sealing plate adopts a semi-circular structure and is located at the lower part of the outlet end of the exhaust gas inlet pipe, preventing the three exhaust gases from mixing due to different pressures and flowing back to their respective upstream equipment.

[0009] Preferably, the swirl plate assembly of the present invention includes an outer fixing ring, an inner fixing ring and a swirl plate. The inner fixing ring is concentrically arranged at the center of the outer fixing ring, and the swirl plate connects the outer wall of the inner fixing ring and the inner wall of the outer fixing ring.

[0010] Preferably, the swirl angle of the swirl plate of the present invention is 45 degrees. The 45-degree swirl angle is combined with the tangential impact swirl of the exhaust gas at its lower end and the jet swirl of the combustion-supporting gas coil, making the distribution of the three gases relatively uniform.

[0011] Preferably, the inner fixing ring of the present invention adopts a hollow ring, and the inner strengthening ring adopts a hollow structure that is not blocked at the top and bottom, ensuring that there is no swirl dead zone in the middle part of the equipment during the premixing swirl of the three exhaust gases.

[0012] Preferably, the gas injection barrel section of the present invention adopts a segmented structure, including a first barrel section and a second barrel section. A connecting flange is provided at one end of the first barrel section and the second barrel section that are close to each other. The connecting flange is locked and fixed by bolts. The upper end of the second barrel section is welded and fixed to the lower end of the conical diffuser barrel section. The exhaust gas inlet pipe is located on the first barrel section, and the combustion-supporting gas inlet pipe is located on the second barrel section. Air, exhaust gas and combustion-supporting gas enter the gas injection barrel section in layers; the segmented design facilitates the installation and disassembly of internal components. The gases enter in layers, avoiding mutual mixing, and can each form a turbulent flow and be fully mixed.

[0013] Beneficial effects: The gas premixing distributor provided by the present invention can effectively mix the three gases relatively evenly, prevent each gas from locally concentrating on the surface of the burner head, and is provided with a semi-circular sealing plate at the end of the exhaust gas pipe that can prevent air from flowing into the exhaust gas pipe, which can avoid a small amount of air from flowing back into the exhaust gas pipe; the layered setting of the three gas inlets also avoids the mixing of the combustion-supporting gas and the exhaust gas pipes into the front-section pipes. The overall material is made of stainless steel, with a long service life and high temperature resistance. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0015] Figure 1 It is a schematic structural diagram of the present invention;

[0016] Figure 2 It is a structural diagram of the combustion-supporting gas inlet pipe of the present invention;

[0017] Figure 3Figure for comparing the gas mixing effects between an existing gas premixing distributor and the gas premixing distributor of the present invention;

[0018] Among them, 1 - gas injection cylinder section, 2 - conical diffusion cylinder section, 3 - combustion-supporting gas inlet pipe, 4 - waste gas inlet pipe, 5 - supporting angle steel, 6 - exhaust hole, 7 - sealing plate, 8 - outer fixing ring, 9 - inner fixing ring, 10 - swirl plate, 11 - first cylinder section, 12 - second cylinder section, 13 - connecting flange. Specific embodiments

[0019] The present invention will be more clearly and completely described below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments.

[0020] As Figure 1 and Figure 2 shown, a gas premixing distributor provided by the present invention is arranged below a burner and is used for premixing waste gas, combustion-supporting gas, and air. It includes a gas injection cylinder section 1 for gas injection and a conical diffusion cylinder section 2 for gas mixing and discharging. The lower end of the gas injection cylinder section 1 serves as an air inlet, and the outlet of the gas injection cylinder section 1 is communicated with the small end of the conical diffusion cylinder section 2. A swirl plate assembly for gas disturbance and mixing is arranged at the junction of the gas injection cylinder section 1 and the conical diffusion cylinder section 2. A combustion-supporting gas inlet pipe 3 and a waste gas inlet pipe 4 are arranged tangentially along the gas injection cylinder section 1, and the combustion-supporting gas inlet pipe 3 and the waste gas inlet pipe 4 are at different height positions on the gas injection cylinder section 1.

[0021] The gas injection cylinder section of the present invention adopts a segmented structure, including a first cylinder section 11 and a second cylinder section 12. One end of the first cylinder section 11 and the second cylinder section 12 close to each other is provided with a connecting flange 13. The connecting flange 13 is locked and fixed by bolts, and a wide gasket is arranged between the connecting flanges 13 for sealing. 8 bolt connection holes with a diameter of Φ18 are opened at the mid-span on the circumference of the connecting flange 13, and are connected and fixed by M16x50 bolts and M16 nuts M16.

[0022] The upper end of the second cylinder section 12 is welded and fixed to the lower end of the conical diffusion cylinder section 2. The conical diffusion cylinder section 2 is formed by a rolling machine; the waste gas inlet pipe 4 is located on the first cylinder section 11, and the combustion-supporting gas inlet pipe 3 is located on the second cylinder section 12. Tangential openings are made on the first cylinder section 11 and the second cylinder section 12 for welding and fixing with the corresponding inlet pipes to form a seal, and air, waste gas, and combustion-supporting gas enter the gas injection cylinder section 1 in layers.

[0023] To prevent gas from flowing back to the upstream equipment due to different pressures between gases, a sealing plate 7 for preventing gas backflow is provided at the outlet end of the waste gas inlet pipe 4 of the present invention. The sealing plate 7 adopts a semi-circular structure and is located at the lower part of the outlet end of the waste gas inlet pipe 4. When air enters, it flows upward from the outside of the sealing plate 7.

[0024] In a specific embodiment, the combustion-aiding gas inlet pipe 3 of the present invention adopts a coil, the outer ring of the coil is tangent to the edge of the gas injection tube section 1, and the inner wall of the gas injection tube section 1 is provided with a support angle steel 5 for support below the coil, and the coil and the support angle steel 5 are fixed by U-shaped pipe clamps and nuts. The end of the coil is sealed by welding, and an exhaust hole 6 is provided on the upper surface of the coil. The aperture of the exhaust hole 6 is designed according to the simulated air flow of the combustion-aiding gas to form a jet swirl, and the aperture of the exhaust hole 6 gradually increases from near to far according to the distance from the air inlet of the combustion-aiding gas inlet pipe 3. The aperture of the exhaust hole on the coil can be controlled from near to far according to the simulation of the pressure of the air inlet flowmeter to ensure the micro-positive pressure injection inside the coil and adjust the aperture of the long distance to be larger than the aperture of the short distance as the distance between the opening and the air inlet is different, so as to ensure that the airflow of each hole is as uniform as possible during the simulation.

[0025] In order to further improve the mixing degree of the gas, the swirl plate assembly of the present invention includes an outer fixed ring 8, an inner fixed ring 9 and a swirl plate 10. The inner fixed ring 9 is concentrically arranged at the center of the outer fixed ring 8. The swirl plate 10 connects the outer wall of the inner fixed ring 9 and the inner wall of the outer fixed ring 8. The swirl angle of the swirl plate 10 is preferably 45 degrees; the inner fixed ring 9 adopts a hollow circular ring, which is not blocked at the top and bottom, and will not cause obstruction to the airflow, ensuring that there is no swirl dead zone in the middle part of the equipment when the three exhaust gases are premixed and swirled.

[0026] When the present invention is in use, it is installed between the round-square pipe fitting at the outlet of the combustion-supporting air blower and the premixing gas collecting cylinder section of the burner head, wherein the bottom end of the injector is customized with a connecting circular plate according to the round-square component size of the combustion-supporting air blower, and the top end of the conical diffuser is butt-welded to the premixing gas collecting cylinder section of the burner head. The exhaust gas inlet pipe 4 and the combustion-supporting gas inlet pipe 3 are both welded with pipe flanges and connected to the upstream pipe by flanges; air enters from the bottom of the first cylinder section 11, and the exhaust gas and the combustion-supporting gas enter through their respective pipes along the tangential direction of the gas injection cylinder section. When the exhaust gas enters, an impact vortex is formed, and the combustion-supporting gas is discharged from the exhaust hole to form a jet vortex, which drives the air to be disturbed and mixed. When passing through the swirl plate assembly, the swirl plate 10 cooperates with the exhaust gas tangential impact vortex at its lower end, and the jet vortex of the combustion-supporting gas coil, so that the three gas streams are distributed more evenly, and the effect is as follows: Figure 3 As shown, the mixed gas can be fully burned after entering the burner to ensure the treatment effect.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas premixing distributor, characterized in that, It includes a gas injection cylinder section (1) for gas injection and a cone diffusion cylinder section (2) for gas mixing and discharge. The lower end of the gas injection cylinder section (1) serves as an air inlet. The outlet of the gas injection cylinder section (1) is communicated with the small end of the cone diffusion cylinder section (2). A swirl plate assembly for gas disturbance and mixing is provided at the junction of the gas injection cylinder section (1) and the cone diffusion cylinder section (2). A combustion-supporting gas inlet pipe (3) and an exhaust gas inlet pipe (4) are arranged tangentially on the gas injection cylinder section (1). The combustion-supporting gas inlet pipe (3) and the exhaust gas inlet pipe (4) are at different height positions on the gas injection cylinder section (1); The combustion-supporting gas inlet pipe (3) is a coiled pipe. The outer circle of the coiled pipe is tangent to the edge of the gas injection cylinder section (1). Support angle steels (5) for support are arranged on the inner wall of the gas injection cylinder section (1) below the coiled pipe. The coiled pipe and the support angle steels (5) are fixed by U-shaped pipe clamps and nuts. The end of the coiled pipe is sealed by welding. Exhaust holes (6) are provided on the upper surface of the coiled pipe; The aperture of the exhaust holes (6) is designed by simulation according to the intake flow rate of the combustion-supporting gas. The aperture of the exhaust holes (6) gradually increases from near to far according to the distance from the intake port of the combustion-supporting gas inlet pipe (3); A sealing plate (7) for preventing gas cross-flow is provided at the outlet end of the exhaust gas inlet pipe (4). The sealing plate (7) is of a semi-circular structure and is located at the lower part of the outlet end of the exhaust gas inlet pipe (4).

2. The gas premixing distributor according to claim 1, wherein The swirl plate assembly includes an outer fixed ring (8), an inner fixed ring (9) and swirl plates (10). The inner fixed ring (9) is concentrically arranged at the center of the outer fixed ring (8). The swirl plates (10) connect the outer wall of the inner fixed ring (9) and the inner wall of the outer fixed ring (8).

3. The gas premixing distributor according to claim 2, wherein The swirl angle of the swirl plates (10) is 45 degrees.

4. A gas premixing distributor according to claim 2 or 3, characterized in that, The inner fixed ring (9) is a hollow ring.

5. A gas premixing distributor according to claim 1 or 2, characterized in that, The gas injection cylinder section adopts a segmented structure, including a first cylinder section (11) and a second cylinder section (12). A connecting flange (13) is provided at one end of the first cylinder section (11) and the second cylinder section (12) close to each other. The connecting flange (13) is locked and fixed by bolts. The upper end of the second cylinder section (12) is welded and fixed to the lower end of the cone diffusion cylinder section (2). The exhaust gas inlet pipe (4) is located on the first cylinder section (11), and the combustion-supporting gas inlet pipe (3) is located on the second cylinder section (12). Air, exhaust gas and combustion-supporting gas enter the gas injection cylinder section (1) in layers.

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