Hot blast stove capable of uniformly mixing flue gas

Abstract

The utility model belongs to the field of asphalt recovery equipment, and particularly relates to a hot blast stove capable of uniformly mixing flue gas. The hot blast stove capable of uniformly mixing the smoke comprises a hot blast stove body and a combustor, the hot blast stove body is sequentially divided into a combustion section, a cooling section and a mixing section from the closed end to the hot blast outlet end, a mixing inner barrel, a mixing mechanism and an interlayer cold air channel are arranged in the mixing section, and the interlayer cold air channel is arranged on the outer side of the mixing inner barrel and communicated with a cold air channel. And the mixing mechanism is arranged in the mixing inner cylinder and is used for mixing the flue gas passing through the mixing inner cylinder. According to the hot-blast stove capable of uniformly mixing the flue gas, the high temperature problem of the mixing inner cylinder can be avoided, the recovered flue gas and the high-temperature flue gas generated by combustion can be fully and uniformly mixed, the pressure loss of a mixing structure is low, the increased load on an induced draft fan is small, and the temperature uniformity of the mixed flue gas at the outlet of the hot-blast stove is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the field of thermal equipment, and in particular relates to a hot air furnace for evenly mixing smoke of a drying drum. Background Art

[0002] At present, in order to effectively reduce the temperature of the inner and outer walls of the hot blast furnace, most jacketed hot blast furnaces use a volute swirl air inlet plus a jacketed double-layer structure, and use the strong swirl of the recovered flue gas to forcefully cool the temperature of the inner and outer walls of the hot blast furnace. This method can indeed make the overall temperature of the inner and outer walls of the hot blast furnace lower and extend the service life of the hot blast furnace, but due to the use of a jacketed double-layer structure, the high-temperature flue gas generated by the middle combustion and the recovered flue gas on the outside are separated, and the recovered flue gas coming out of the gap channel of the jacket keeps rotating out along the wall due to the centrifugal effect of the strong swirl, resulting in poor uniformity of the temperature of the mixed flue gas at the outlet of the hot blast furnace, which will have a greater impact on the subsequent material drying. Utility Model Content

[0003] In order to overcome the deficiencies in the prior art, the utility model provides a hot blast furnace with uniformly mixed flue gas, and the technical solution adopted is as follows:

[0004] A hot blast stove with uniform flue gas mixing comprises a hot blast stove body and a burner, wherein one end of the hot blast stove body is a closed end and the other end is a hot blast outlet end, a cold blast channel is arranged in the hot blast stove body, and the hot blast stove body is divided into a combustion section, a cooling section and a mixing section from the closed end to the hot blast outlet end in sequence, a jacketed cylinder is arranged in the cooling section, and cold blast holes connected to the cold blast channel are opened on the jacketed cylinder, a mixing inner cylinder, a mixing mechanism and an interlayer cold blast channel are arranged in the mixing section, the interlayer cold blast channel is arranged on the outside of the mixing inner cylinder and connected to the cold blast channel, and the mixing mechanism is arranged in the mixing inner cylinder to mix the flue gas passing through the mixing inner cylinder.

[0005] Furthermore, an inner furnace is provided in the combustion section, the inner furnace is connected to the jacketed cylinder, the burner is connected to the closed end of the hot blast stove body, and the burner sprays fuel into the combustion section.

[0006] Furthermore, a cold air channel volute is provided on the hot blast furnace body, and the cold air channel volute is arranged on the outer side of the inner furnace, a cold air channel is formed between the cold air channel volute and the outer side of the inner furnace, and a cold air channel air inlet is provided on the cold air channel volute.

[0007] Furthermore, the closed end of the hot blast furnace body is provided with an end face cold air channel, the end face cold air channel includes an end face cold air inlet and at least one end face cold air outlet, and the end face cold air outlet is opened on the end face of the closed end of the hot blast furnace body.

[0008] Furthermore, a jacket cold air channel is left between the side wall of the jacket cylinder and the inner wall of the cooling section, and the jacket cold air channel is communicated with the cold air channel.

[0009] Furthermore, the jacket cylinder includes multiple sections, and the multiple sections of the jacket cylinder are connected end to end, and jacket gap air outlets are left at the connection points.

[0010] Furthermore, the mixing inner cylinder is connected to the jacket cylinder, and the interlayer cold air channel is communicated with the jacket cold air channel.

[0011] Furthermore, it also includes a mixing outer cylinder, which is sleeved outside the mixing inner cylinder, and a gap between the mixing outer cylinder and the mixing inner cylinder is an interlayer cold air channel.

[0012] Furthermore, the mixing mechanism includes a plurality of spoilers and a wind shield, wherein the spoiler is arranged on the inner wall of the mixing inner cylinder and is arranged opposite to the air inlet direction of the cold air channel, and the wind shield is arranged in the middle of the mixing inner cylinder.

[0013] Furthermore, it also includes a conical air outlet, which is connected to the mixing inner cylinder.

[0014] The hot blast furnace with uniform flue gas mixing can avoid the high temperature problem of the mixing inner cylinder by setting a cold air channel through the mixing inner cylinder and the interlayer in the mixing section, so that the recovered flue gas and the high-temperature flue gas generated by combustion can be mixed for a longer time in the mixing section. Compared with conventional hot blast furnaces, the hot blast furnace with uniform flue gas mixing of the utility model can avoid the high temperature problem of the mixing inner cylinder, and can fully mix the recovered flue gas and the high-temperature flue gas generated by combustion. The pressure loss of the mixing structure is low, the load added to the induced draft fan is small, and the temperature uniformity of the mixed flue gas at the outlet of the hot blast furnace is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the internal structure of a hot blast stove for uniformly mixing flue gas;

[0016] Figure 2 A schematic diagram of the external structure of a hot blast stove for uniformly mixing flue gas;

[0017] Figure 3 It is a schematic diagram of the structure of the hot blast furnace mixing section for uniformly mixing flue gas;

[0018] Figure 4 Schematic diagram of the working process of the hot blast stove with uniform mixing of flue gas. DETAILED DESCRIPTION

[0019] The present invention is further described below through specific implementation methods.

[0020] A hot blast stove with uniform flue gas mixing, comprising a hot blast stove body 1 and a burner 2;

[0021] The hot air stove body 1 includes a closed end 11, a hot air outlet end 12, and is divided into a combustion section 13, a cooling section 14, a mixing section 15, an end surface cold air channel 16, and a cold air channel 17 from the closed end 11 to the hot air outlet end 12.

[0022] An inner furnace 131 is provided in the combustion section 13. One end of the inner furnace 131 is connected to the inner end surface of the closed end 11 of the hot blast stove body 1, and the other end is connected to the jacket cylinder 141. The inner furnace 131 is a cylindrical structure, which is used for the combustion of the fuel of the burner 2. The inner furnace 131 isolates the recovered flue gas from the flame to prevent a large amount of recovered flue gas from directly blowing and affecting the combustion flame. The recovered flue gas in the cold air channel 17 forces the outer wall of the inner furnace 131 to cool down to prevent the temperature of the inner furnace from being too high and affecting the service life of its materials.

[0023] The cooling section 14 is provided with a jacket cylinder 141, which is a cylindrical structure, and has cold air holes 142 evenly opened on the jacket cylinder 141. The jacket cylinder 141 includes multiple sections, and the multiple sections of the jacket cylinder are connected end to end, and a jacket gap air outlet 143 is left at the connection. A jacket cold air channel 144 is left between the side wall of the jacket cylinder 141 and the inner wall of the cooling section 14, and the jacket cold air channel 144 is connected to the cold air channel 17. The jacket cylinder 141 can pass the fire The flame is separated from the cooling section 14 to avoid direct flame exposure and high temperature of the outer cylinder. The jacket cold air channel 144 is consistent front and back to avoid the risk of block materials getting stuck in the gap when cleaning the dust accumulation on the upper volute. The wind from the cold air channel 17 enters the jacket cylinder 141 through the cold air hole 142, and enters and exits the multi-stage jacket cylinder 141 through the jacket gap outlet 143 to achieve multi-stage mixing with the high-temperature flue gas. The high temperature problem of the jacket cylinder 141 of the cooling section 14 can be avoided through multi-stage mixing.

[0024] The mixing section 15 includes a mixing inner cylinder 151, a mixing outer cylinder 152, a sandwich cold air channel 153, a spoiler 154, a wind shield 155, and a conical air outlet 156. The mixing inner cylinder 151 is connected to the jacket cylinder 141, and the mixing outer cylinder 152 is sleeved outside the mixing inner cylinder 151. The gap between the mixing outer cylinder 152 and the mixing inner cylinder 151 is the sandwich cold air channel 153, and the sandwich cold air channel 153 is connected to the jacket cold air channel 144. The mixing mechanism is arranged in the mixing inner cylinder to The flue gas passing through the mixing inner cylinder is mixed, and the mixing mechanism includes a spoiler 154 and a wind shield 155. The spoiler is arranged on the inner wall of the mixing inner cylinder and is arranged in the opposite direction of the air inlet direction of the cold air channel 172. The wind shield 155 is arranged in the middle section of the mixing section. The number, shape, angle and front and back sequence of the spoiler 154 and the wind shield 155 are adjusted according to the situation that is conducive to flue gas mixing. The conical air outlet 156 is connected to the mixing inner cylinder, and the cold and hot flue gases are fully mixed and discharged from the conical air outlet 156;

[0025] The end surface cold air channel 16 is arranged at the closed end of the hot blast furnace body 1, and the end surface cold air channel 16 comprises an end surface cold air inlet 161 and at least one end surface cold air outlet 162, and the end surface cold air outlet 162 is opened on the end surface of the closed end of the hot blast furnace body 1;

[0026] The cold air channel 17 is arranged in the hot air furnace body 1. The hot air furnace body 1 is provided with a cold air channel volute 171. The cold air channel volute 171 is provided with a cold air channel air inlet 172. The cold air channel 17 is formed between the cold air channel volute 171 and the outer side of the inner furnace 131.

[0027] The burner 2 is connected to the closed end 11 of the hot blast stove body, and the burner 2 sprays fuel into the inner furnace 131 of the combustion section 13 .

[0028] Reference Figures 1 to 4 As shown, the working process of the hot blast furnace with uniform flue gas mixing provided by the utility model is as follows:

[0029] The burner 2 injects fuel into the inner furnace 131 of the combustion section 13, and the fuel burns in the inner furnace 131 to form high-temperature flue gas;

[0030] A small amount of recovered flue gas enters the end face cold air channel 16 from the end face cold air inlet 161, and then comes out from the end face cold air outlet 162, and is mixed with the high temperature flue gas generated by the burner 2 at the same time as cooling the burner 2;

[0031] Most of the recovered flue gas enters the cold air channel 17 between the cold air channel volute 171 and the inner furnace 131. After the recovered flue gas in the cold air channel 17 cools the wall of the inner furnace 131, it enters the jacket cold air channel 144 between the jacket cylinder 141 and the cooling section 14 to cool the jacket cylinder 141. A part of the recovered flue gas in the jacket cold air channel 144 enters the center of the jacket cylinder 141 from the cold air hole 142, and the other part enters and exits the multi-stage jacket cylinder 141 through the jacket gap air outlet 143 to achieve multi-stage mixing with the high-temperature flue gas.

[0032] A small amount of recovered flue gas coming out of the interlayer cold air channel 153 enters the jacket cold air channel 144, which is used to cool the mixing inner cylinder 151 and the mixing outer cylinder 152, which can avoid the high temperature problem of the mixing inner cylinder 151 and the mixing outer cylinder 152, and make the recovered flue gas and the high-temperature flue gas generated by combustion mix for a longer time in the mixing section 15, so as to make them fully mixed and uniform. Thirdly, the mixing structure has a low pressure loss. A reverse spoiler 154 is arranged on the wall of the inner cylinder in the front section of the mixing section, which is opposite to the tangential inlet of the volute, and a wind shield 155 is arranged in the middle section. After the cold and hot flue gases are fully mixed, they go out from the conical air outlet 156.

[0033] The hot blast furnace with uniform flue gas mixing can avoid the high temperature problem of the mixing inner cylinder by setting a cold air channel through the mixing inner cylinder and the interlayer in the mixing section, so that the recovered flue gas and the high-temperature flue gas generated by combustion can be mixed for a longer time in the mixing section. Compared with conventional hot blast furnaces, the hot blast furnace with uniform flue gas mixing of the utility model can avoid the high temperature problem of the mixing inner cylinder 151, can fully mix the recovered flue gas and the high-temperature flue gas generated by combustion, the pressure loss of the mixing structure is low, the load added to the induced draft fan is small, and the temperature uniformity of the mixed flue gas at the outlet of the hot blast furnace is effectively improved.

[0034] The above are only some specific implementation methods of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. A hot blast stove with uniform flue gas mixing, comprising a hot blast stove body and a burner, characterized in that: One end of the hot blast stove body is a closed end, and the other end is a hot blast outlet end. A cold air channel is arranged in the hot blast stove body. The hot blast stove body is divided into a combustion section, a cooling section and a mixing section from the closed end to the hot blast outlet end. A jacketed cylinder is arranged in the cooling section, and cold air holes connected to the cold air channel are opened on the jacketed cylinder. A mixing inner cylinder, a mixing mechanism and an interlayer cold air channel are arranged in the mixing section. The interlayer cold air channel is arranged on the outside of the mixing inner cylinder and connected to the cold air channel. The mixing mechanism is arranged in the mixing inner cylinder to mix the flue gas passing through the mixing inner cylinder.

2. The hot blast stove with uniform flue gas mixing according to claim 1, characterized in that: An inner furnace is arranged in the combustion section, the inner furnace is connected to the jacket cylinder, the burner is connected to the closed end of the hot blast stove body, and the burner sprays fuel into the combustion section.

3. The hot blast stove with uniform flue gas mixing according to claim 2, characterized in that: The hot blast furnace body is provided with a cold air channel volute, the cold air channel volute is arranged on the outer side of the inner furnace, a cold air channel is formed between the cold air channel volute and the outer side of the inner furnace, and a cold air channel air inlet is provided on the cold air channel volute.

4. The hot blast stove with uniform flue gas mixing according to claim 2, characterized in that: The closed end of the hot blast furnace body is provided with an end surface cold air channel, the end surface cold air channel comprises an end surface cold air inlet and at least one end surface cold air outlet, and the end surface cold air outlet is opened on the end surface of the closed end of the hot blast furnace body.

5. The hot blast stove with uniform flue gas mixing according to claim 1, characterized in that: A jacket cold air channel is left between the side wall of the jacket cylinder and the inner wall of the cooling section, and the jacket cold air channel is communicated with the cold air channel.

6. The hot blast stove with uniform flue gas mixing according to claim 1 or 5, characterized in that: The jacket cylinder comprises multiple sections, the multiple sections of the jacket cylinder are connected end to end, and a jacket gap air outlet is left at the connection.

7. The hot blast stove with uniform flue gas mixing according to claim 5, characterized in that: The mixing inner cylinder is connected to the jacket cylinder, and the interlayer cold air channel is communicated with the jacket cold air channel.

8. The hot blast stove with uniform flue gas mixing according to claim 1, characterized in that: It also includes a mixing outer cylinder, which is sleeved outside the mixing inner cylinder, and a gap between the mixing outer cylinder and the mixing inner cylinder is an interlayer cold air channel.

9. The hot blast stove with uniform flue gas mixing according to claim 1, characterized in that: The mixing mechanism comprises a spoiler and a wind shield. The spoiler is arranged on the inner wall of the mixing inner cylinder and is arranged opposite to the air inlet direction of the cold air channel. The wind shield is arranged in the middle of the mixing inner cylinder.

10. The hot blast stove with uniform flue gas mixing according to claim 1, characterized in that: It also includes a conical air outlet, which is connected to the mixing inner cylinder.

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