Mill flue gas recovery combustion-supporting system

Abstract

The utility model relates to a mill flue gas recovery combustion-supporting system which comprises a flue gas furnace, the flue gas furnace comprises a furnace body, one end of the furnace body is provided with an air return pipe, one end of the air return pipe is connected to a flue gas outlet of a mill, the other end of the air return pipe is communicated with the interior of a hearth, and the other end of the furnace body is provided with a flue gas pipe communicated with the hearth. The outer end of the flue gas pipe is connected to a flue gas inlet of the mill; a combustor is arranged on the side wall of the furnace body and used for providing flames into the hearth so as to generate smoke, and a branch pipeline is arranged on the side portion of the air return pipe and connected to a combustion-supporting air inlet of the combustor. According to the utility model, the flue gas of the mill is fully recycled, so that the gas consumption is reduced, and the economic benefit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mill production technical field, and specifically is a mill flue gas recovery combustion-supporting system. BACKGROUND

[0002] Mill production needs to input a large amount of flue gas, and the flue gas temperature and wind speed have certain requirements, the flue gas is discharged as the tail gas of mill after being dried to material by mill, and the oxygen content of tail gas is about 19% after detection, so the tail gas can be recycled as combustion-supporting gas, but in actual production, most enterprises directly discharge the tail gas, which obviously causes certain waste. SUMMARY

[0003] The utility model discloses a mill flue gas recovery combustion-supporting system, which recycles the flue gas of mill as combustion-supporting gas of flue gas furnace for reuse, thereby improving economic benefits.

[0004] The specific scheme of the utility model is: a mill flue gas recovery combustion-supporting system, which comprises a flue gas furnace, the flue gas furnace comprises a furnace body, one end of the furnace body is provided with a return air pipe, one end of the return air pipe is connected to a flue gas outlet of a mill, the other end of the return air pipe is in communication with the inside of a hearth, the other end of the furnace body is provided with a flue gas pipe in communication with the hearth, and the outer end of the flue gas pipe is connected to a flue gas inlet of the mill.

[0005] Further, the branch pipe is connected to the upper middle part of the return air pipe.

[0006] Further, the furnace body is provided with a sandwich cavity, the sandwich cavity is provided with an inlet and an outlet, the inlet is connected to the branch pipe, and the outlet is connected to the combustion-supporting air inlet of the burner through a pipeline.

[0007] Further, the inlet of the sandwich cavity is arranged on the flue gas outlet side of the furnace body, and the outlet of the sandwich cavity is arranged on the side close to the burner.

[0008] Further, the sandwich cavity is provided with a spiral guide plate, so that the combustion-supporting air flows in the spiral direction in the sandwich cavity.

[0009] Further, the burner is installed at the tangential position of the furnace body, so that the sprayed flame rotates circumferentially along the inner wall of the furnace body.

[0010] Further, the tail end of the flue gas furnace is connected with a mixed air column, and the mixed air column is used for air distribution of the flue gas to make the flue gas parameters meet the parameter requirements of the mill.

[0011] The utility model discloses have the following beneficial effects: the tail gas of mill is directly recycled, is used in two parts, one part is as the flue gas into the flue gas furnace, improves the flue gas production of flue gas furnace, another part is as the combustion-supporting gas through the fan introduction combustion-supporting wind entrance of burner, has reduced the gas consumption of flue gas furnace, improves the economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the front view of the utility model;

[0013] Figure 2 It is the sectional view of the flue gas furnace of the utility model;

[0014] Figure 3 It is Figure 1 left view of;

[0015] In the drawing: 1, return air pipe;2, branch pipeline;3, burner;4, flue gas furnace;41, furnace body;42, interlayer cavity;5, fan;6, mixed air column. DETAILED DESCRIPTION

[0016] Referring to Figures 1-3 , the embodiment is a kind of mill flue gas recovery combustion-supporting system, including flue gas furnace 4, flue gas furnace 4 includes furnace body 41, the furnace body 41 one end is equipped with return air pipe 1, return air pipe 1 one end is connected to the flue gas outlet of mill, the other end of return air pipe 1 is communicated with furnace interior, the other end of the furnace body 41 is equipped with the flue gas pipe that is communicated with furnace, flue gas pipe outer end is connected to the flue gas inlet of mill;The side wall of the furnace body 41 is equipped with burner 3, burner 3 is used to provide flame to furnace and thus produce flue gas, the side of return air pipe 1 is equipped with branch pipeline 2, branch pipeline 2 is connected to the combustion-supporting wind entrance of burner 3.

[0017] Further, the branch pipe is connected with the middle upper portion of return air pipe 1.Further, the outer wall of the furnace body 41 is equipped with interlayer cavity 42, interlayer cavity 42 is equipped with import and export, the import is connected with branch pipeline 2, and the export is connected with the combustion-supporting wind entrance of burner 3 by pipeline.

[0018] Further, the import of the interlayer cavity 42 is arranged at the flue gas outlet side of the furnace body 41, and the export of the interlayer cavity 42 is arranged at the side close to burner 3.

[0019] Further, the interlayer cavity 42 is equipped with helical guide vane, so that the combustion-supporting wind flows in helical direction in the interlayer cavity 42, to make the combustion-supporting wind and furnace wall fully heat exchange, improve combustion efficiency.

[0020] Further, the burner 3 is installed at the tangential position of the furnace body 41, so that the jet flame rotates along the inner wall of the furnace body 41, to make the flue gas produced by the flue gas furnace 4 and the flue gas returned by the return air pipe 1 fully mix, improve air distribution effect.

[0021] Further, the tail end of the flue gas furnace 4 is connected with a mixed air column 6, which is used for air distribution of the flue gas so that the flue gas parameters reach the parameter requirements of the mill.

[0022] The working principle of the utility model is as follows: the flue gas at the tail end of the mill enters the flue gas furnace 4 through the return air pipe 1, a part of the flue gas enters the interlayer cavity 42 of the flue gas furnace 4 through the branch pipe 2 by the fan 5, flows along the interlayer cavity 42 and is heated by the high-temperature furnace body 41, and then enters the combustion-supporting air inlet of the burner 3 through the pipe, the flame sprayed by the burner 3 flows along the hearth in a ring shape, high-temperature flue gas is generated, the high-temperature flue gas is fully mixed with the low-temperature flue gas returned from the return air pipe 1 in the furnace body 41 to realize air distribution, the mixed flue gas flows out of the flue gas furnace 4, is again air-distributed by the mixed air column 6 to the parameters required by the mill, and finally enters the mill.

[0023] Taking a mill with a yield of 100t / h as an example, the air consumption of the mill before the utility model is used is 125Nm 3 / t, and the air consumption is reduced to 103Nm 3 / t after the utility model is used for modification. The air distribution amount is reduced, a large amount of fuel gas is saved, and the carbon emission amount is reduced.

Claims

1. A mill flue gas recovery and combustion-supporting system, comprising a flue gas furnace, characterized in that: The flue gas furnace includes a furnace body. One end of the furnace body is provided with a return air duct, which is connected to the flue gas outlet of the mill. The other end of the return air duct is connected to the interior of the furnace. The other end of the furnace body is provided with a flue gas duct that is connected to the furnace. The outer end of the flue gas duct is connected to the flue gas inlet of the mill. A burner is provided on the side wall of the furnace body. The burner is used to provide flames to the furnace to generate flue gas. A branch pipe is provided on the side of the return air duct, which is connected to the combustion air inlet of the burner.

2. The mill flue gas recovery and combustion-supporting system according to claim 1, characterized in that: The branch pipe is connected to the upper middle part of the return air pipe.

3. The mill flue gas recovery and combustion-supporting system according to claim 1, characterized in that: The outer wall of the furnace body is provided with a jacketed cavity, which has an inlet and an outlet. The inlet is connected to a branch pipe, and the outlet is connected to the combustion air inlet of the burner through a pipe.

4. The mill flue gas recovery and combustion-supporting system according to claim 3, characterized in that: The inlet of the jacketed cavity is located on the flue gas outlet side of the furnace body, and the outlet of the jacketed cavity is located on the side close to the burner.

5. A mill flue gas recovery and combustion-supporting system according to claim 3, characterized in that: The interlayer cavity is equipped with a spiral guide plate, which allows the combustion air to flow in a spiral direction within the interlayer cavity.

6. The mill flue gas recovery and combustion-supporting system according to claim 1, characterized in that: The burner is installed in a tangential position on the furnace body, so that the injected flame rotates circumferentially along the inner wall of the furnace body.

7. A mill flue gas recovery and combustion-supporting system according to claim 1, characterized in that: The tail end of the flue gas furnace is connected to a mixing column, which is used to distribute the flue gas so that the flue gas parameters meet the requirements for entering the mill.

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