Exhaust gas combustion device

Abstract

The application discloses a waste gas combustion device, which comprises a burner and a flue gas pipe; the upper burner comprises a combustion chamber, a combustion chamber connecting pipe is arranged at the bottom of the combustion chamber, a tapered hole with a large upper part and a small lower part is arranged in the combustion chamber connecting pipe, a circular truncated cone pressure maintaining valve with a large upper part and a small lower part is movably arranged in the tapered hole; the lower flue gas pipe is composed of an upper straight pipe arranged vertically at the top, an inclined pipe arranged downwardly at the middle part, and a lower straight pipe arranged vertically at the bottom; a carbon discharging pipe arranged downwardly is arranged on the inner wall of the inclined pipe at the connection position of the inclined pipe and the lower straight pipe; a plug is arranged on the pipe opening of the carbon discharging pipe; and an arc-shaped baffle is arranged outside the pipe opening of the carbon discharging pipe connected with the inclined pipe. The device has the advantages of simple structure, convenient use, easy maintenance, reduced carbon black generation, prevention of combustion furnace pressure out-of-control phenomenon after the generation of carbon black, and reduced maintenance and maintenance frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of waste gas combustion device, can be used in carburizing furnace, garbage combustion furnace, industrial combustion furnace and other fields, belongs to metal heat treatment and mechanical field. BACKGROUND

[0002] In carburizing furnace, garbage combustion furnace and other equipment, the waste gas generated in process is generally combusted by waste gas combustion port, but because waste gas is generally carbon-containing atmosphere (CO, CO2, CH4, C3H8 etc.), these atmospheres are active carbon atoms at high temperature, exist in the form of gas, when temperature is lower than 800 DEG C, atmosphere will react, form carbon black.

[0003] Such as carburizing furnace, the temperature in furnace is generally higher than 850 DEG C, generally will not form carbon black, but when waste gas is discharged outward through waste gas port, atmosphere temperature drops when passing through waste gas pipeline, atmosphere reacts, forms carbon black.Carbon black accumulation can corrode metal or alloy surface, also can cause pipeline blockage, equipment furnace pressure out of control. SUMMARY

[0004] The present application aims to provide a kind of waste gas combustion device for reducing carbon black production.

[0005] The present application is implemented by the following technical solutions: a waste gas combustion device includes an upper and lower combustion device and a flue gas pipe;The upper combustion device includes a combustion chamber, and a combustion chamber connecting pipe is arranged at the bottom of the combustion chamber and communicates with the combustion chamber;A tapered hole with a large upper end and a small lower end is formed in the combustion chamber connecting pipe, and a circular truncated cone pressure retaining valve with a large upper end and a small lower end is movably arranged in the tapered hole;The flue gas pipe includes an upper straight pipe arranged vertically at the top, an inclined pipe arranged downwardly at the middle, and a lower straight pipe arranged vertically at the bottom, and a carbon discharge pipe is arranged on the inner wall of the inclined pipe at the connection between the inclined pipe and the lower straight pipe;An arc-shaped baffle is arranged outside the pipe opening of the carbon discharge pipe;The arc-shaped baffle is vertically fixed on the inner wall of the lower straight pipe;A plug is arranged on the pipe opening of the carbon discharge pipe.

[0006] Preferably, the angle between the generatrix of the tapered hole and the center line is 7°-45°, the angle between the generatrix of the pressure retaining valve and the center line is greater than the angle between the generatrix of the tapered hole and the center line, and the upper end diameter of the pressure retaining valve is greater than the lower end hole diameter of the tapered hole.

[0007] Preferably, the pressure retaining valve has an open top end and a hollow structure, a positioning rod is vertically arranged at the center of the bottom surface of the inner cavity of the pressure retaining valve, and a counterweight is movably arranged on the positioning rod.

[0008] Preferably, the height of the arc-shaped baffle is greater than 1 / 2 of the diameter of the lower straight pipe.

[0009] Preferably, a burner connecting flange is arranged on the bottom pipe opening of the combustion chamber connecting pipe, a flue gas pipe connecting flange is arranged on the top pipe opening of the upper straight pipe; the burner and the flue gas pipe are connected correspondingly in separated parts through the flue gas pipe connecting flange and the burner connecting flange; an installation flange is arranged on the bottom pipe opening of the lower straight pipe.

[0010] Preferably, a heat preservation layer is arranged on the outer wall of the combustion chamber connecting pipe, the flue gas pipe and the carbon discharge pipe.

[0011] The advantages of the present application are as follows: compared with the prior art, the present application has simple structure, convenient use and easy maintenance; by adjusting the overall weight of the conical pressure retaining valve, the amount of flue gas entering the combustion chamber through the conical pressure retaining valve is adjusted, so that the effect of pressure relief (or pressure retention) is achieved, the problem of combustion furnace pressure out of control is effectively solved; the generation of carbon black is reduced, and the phenomenon of combustion furnace pressure out of control after the generation of carbon black is prevented, the frequency of repair and maintenance is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present application. DETAILED DESCRIPTION

[0013] Embodiment: as Figure 1The waste gas combustion device is shown, which comprises a burner 1 and a flue gas pipe 2 arranged vertically; the burner 1 at the top comprises a combustion chamber 11, a combustion chamber connecting pipe 12 is arranged at the bottom of the combustion chamber 11 and communicates with the combustion chamber 11; a burner connecting flange 13 is arranged at the bottom of the combustion chamber connecting pipe, a tapered hole 14 with a large top and a small bottom is formed in the combustion chamber connecting pipe 12, the angle between the generatrix of the tapered hole 14 and the center line is 7°, a circular truncated cone pressure maintaining valve 15 with a large top and a small bottom is movably arranged in the tapered hole 14, the taper of the pressure maintaining valve 15 is larger than that of the tapered hole 14 to prevent the pressure maintaining valve 15 from being stuck in the hot state; the diameter of the upper end of the pressure maintaining valve 15 is larger than that of the bottom hole of the tapered hole 14 to prevent the pressure maintaining valve 15 from falling off; the pressure maintaining valve 15 has a hollow structure with an open top; a positioning rod 16 is vertically arranged at the center of the bottom surface of the pressure maintaining valve 15; a counterweight 17 for adjusting the pressure in the furnace is movably arranged on the positioning rod; by adjusting the number and weight of the counterweight 17, the overall weight of the pressure maintaining valve 15 is adjusted; when the pressure in the furnace acting on the lower bottom surface of the pressure maintaining valve 15 is greater (or smaller) than the overall weight of the pressure maintaining valve 15, the pressure maintaining valve 15 will be floated (or fall back) as a whole, so as to adjust the amount of flue gas entering the combustion chamber 11 through the pressure maintaining valve 15, thereby achieving the effect of pressure relief (or pressure maintaining) and effectively solving the problem of out-of-control furnace pressure; the flue gas pipe 2 comprises an upper straight pipe 21 vertically arranged at the top, an inclined pipe 22 obliquely arranged downward at the middle, and a lower straight pipe 23 vertically arranged at the bottom; the flue gas pipe 2 is made of heat-resistant steel pipe and is bent or welded into a shape of single-side inclination; a flue gas pipe connecting flange 25 is arranged at the top of the upper straight pipe 21; the burner 1 and the flue gas pipe 2 are correspondingly connected by the burner connecting flange 13 and the flue gas pipe connecting flange 25; an installation flange 26 is arranged at the bottom of the lower straight pipe 23; a carbon discharge pipe 3 is arranged on the inner wall of the inclined pipe 22 at the connection between the inclined pipe 22 and the lower straight pipe 23; an arc-shaped baffle 24 is arranged outside the pipe opening of the carbon discharge pipe 3 connected with the inclined pipe 22; the arc-shaped baffle 24 is vertically fixed on the inner wall of the lower straight pipe 23; the arc-shaped baffle 24 is arranged below the outside of the combustion chamber connecting pipe 12, so that the arc-shaped baffle 24 cannot be seen when looking downward from above the tapered hole 14, which is beneficial to the accumulation of carbon black in the carbon discharge pipe 3 without falling into the lower straight pipe 23; the height of the arc-shaped baffle 24 should not be higher than half of the diameter of the lower straight pipe 23 to avoid affecting the flowability of the waste gas; a plug 4 is arranged at the pipe opening of the carbon discharge pipe 3, so that the carbon can be discharged by opening the plug 4 during maintenance without disassembling the burner 1 and the flue gas pipe 2; a heat preservation layer 5 is arranged on the outer wall of the combustion chamber connecting pipe 12, the flue gas pipe 2 and the carbon discharge pipe 3; the heat preservation layer 5 can be made of glass fiber cotton or other heat insulation materials to reduce the temperature drop of the waste gas flowing through the combustion chamber connecting pipe 12 and the flue gas pipe 2 to the combustion chamber 11 and reduce the generation of carbon black.

Claims

1. An exhaust gas combustion device, characterized by It includes the burner and flue gas pipe arranged above and below; the burner above includes the combustion chamber, and the combustion chamber connecting pipe communicated with the combustion chamber is arranged at the bottom of the combustion chamber; The taper hole with the upper large and lower small is arranged in the combustion chamber connecting pipe, and the circular truncated cone pressure retaining valve with the upper large and lower small is movably arranged in the taper hole; the flue gas pipe below is composed of the upper straight pipe arranged vertically at the top, the inclined pipe arranged downwardly at the middle, and the lower straight pipe arranged vertically at the bottom, and the inclined pipe wall on the inner side of the connection between the inclined pipe and the lower straight pipe is provided with the downwardly inclined arranged carbon discharge pipe; the arc baffle is arranged outside the carbon discharge pipe connected with the inclined pipe; the arc baffle is vertically fixed on the inner wall of the lower straight pipe; the plug is arranged on the pipe opening of the carbon discharge pipe.

2. The exhaust gas combustion device according to claim 1, characterized by The included angle between the generatrix of the taper hole and the center line is 7°-45°, and the included angle between the generatrix of the pressure retaining valve and the center line is greater than the included angle between the generatrix of the taper hole and the center line; the upper end diameter of the pressure retaining valve is greater than the bottom end hole diameter of the taper hole.

3. The exhaust gas combustion device according to any one of claims 1 or 2, characterized in that, The pressure retaining valve has the open top end and the hollow structure inside; the positioning rod is vertically arranged at the center of the bottom surface of the pressure retaining valve; the counterweight is movably arranged on the positioning rod.

4. The exhaust gas combustion device according to any one of claims 1 or 2, characterized in that, The height of the arc baffle is greater than 1 / 2 of the diameter of the lower straight pipe.

5. The exhaust gas combustion device according to claim 3, characterized by The height of the arc baffle is greater than 1 / 2 of the diameter of the lower straight pipe.

6. The exhaust gas combustion device according to claim 1, characterized by The burner connecting flange is arranged on the bottom pipe opening of the combustion chamber connecting pipe, and the flue gas pipe connecting flange is arranged on the top pipe opening of the upper straight pipe; the burner and the flue gas pipe are correspondingly connected by the flue gas pipe connecting flange and the burner connecting flange; the installation flange is arranged on the bottom pipe opening of the lower straight pipe.

7. The exhaust gas combustion device according to claim 1, characterized by The heat preservation layer is arranged on the outer wall of the combustion chamber connecting pipe, the flue gas pipe and the carbon discharge pipe. The heat preservation layer is arranged on the outer wall of the combustion chamber connecting pipe, the flue gas pipe and the carbon discharge pipe.

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