CN213739208U - Double-chamber kiln reconstructed from shaft kiln - Google Patents
Double-chamber kiln reconstructed from shaft kiln Download PDFInfo
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- CN213739208U CN213739208U CN202022044955.0U CN202022044955U CN213739208U CN 213739208 U CN213739208 U CN 213739208U CN 202022044955 U CN202022044955 U CN 202022044955U CN 213739208 U CN213739208 U CN 213739208U
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Abstract
The utility model relates to a double-chamber kiln reconstructed from a shaft kiln, which comprises two kiln bodies, a feeding system, a waste gas discharge system, a fuel supply system, a discharging system and a control system. The upper part of each kiln body is provided with a charging hole, and the lower part is provided with a discharging hole. The kiln body calcining zone is provided with at least one fuel spray gun, the upper part of the preheating zone is provided with a flue gas/combustion-supporting air port, and the lower part of the cooling zone is provided with a cooling air inlet. An external annular channel, an internal annular channel or a flue gas channel opening is arranged between the calcining zone and the cooling zone of the kiln body, the external annular channel, the internal annular channel or the flue gas channel opening of the two kiln bodies are connected together through an external connecting channel, and a flue gas opening is arranged between the external annular channel or the internal annular channel and the kiln chamber. The utility model discloses a set up annular channel and interface channel and get up the kiln body coupling of two roof beam formula limekilns or ordinary shaft kiln and reform transform into two thorax kilns, energy-concerving and environment-protective, product quality is good, is suitable for reconstruction on current limekiln basis, increases enterprise economic benefits.
Description
Technical Field
The utility model belongs to the technical field of chemical building material production equipment, a two thorax kilns by shaft kiln reconstruction is related to.
Background
The double-hearth kiln is also called a double-hearth parallel-flow heat accumulating type lime kiln, and fuel enters from the upper end of a calcining zone and flows in parallel with raw materials. Since the fuel is injected from the upper part of the calcining zone, the raw material can absorb most of the heat released by the fuel, and the temperature of the calcining zone is 950 ℃ on average. Another important feature of the double-hearth kiln is heat storage, which is used to preheat a portion of the combustion air. The thermal characteristics of cocurrent calcination and countercurrent heat storage determine that the double-hearth kiln has high thermal efficiency, the heat energy consumption is the lowest in all types of lime kilns such as rotary kilns and sleeve kilns, and the total heat consumption for producing lime is lower than 3.8 GJ/ton lime.
The burning beam in the existing beam type lime kiln, such as the solid fuel lime calcination, is limited by the process, the calcination effect is not ideal enough, and the quality requirement of the lime kiln smoke emission can not be fully met. The common shaft kiln has limited adaptability to fuel and poor product quality due to the structural limitation of the common shaft kiln.
The kiln body of the two beam limekilns or the common shaft kiln is utilized, and the annular channel and the connecting channel which are necessary for the double-chamber kiln are constructed by arranging the external annular channel and the external connecting channel, so that the aim of transforming the double-chamber kiln is fulfilled.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a two thorax kilns rebuilt by shaft kiln reforms transform into the beam type lime kiln who has now through optimal design and becomes two thorax kilns of cocurrent flow formula, enlarges the productivity of device, reduces energy consumption, improves product quality, adapts to multiple fuel, reduces the equipment investment, increases economic benefits.
The technical scheme of the utility model is that: the double-chamber kiln reconstructed from the shaft kiln comprises two kiln bodies, a feeding system, a waste gas discharge system, a fuel supply system, a discharging system and a control system. The upper part of each kiln body is provided with a charging hole, and the lower part is provided with a discharging hole. The kiln body comprises a preheating zone, a calcining zone and a cooling zone, and the calcining zone is provided with at least one fuel spray gun. The upper part of the preheating zone is provided with a flue gas/combustion-supporting air port which is connected with a combustion-supporting fan and a waste gas discharge system through a three-way valve. The lower part of the cooling belt is provided with a cooling air inlet which is connected with a cooling fan. An external annular channel, an internal annular channel or a flue gas channel opening are arranged between the calcining zone and the cooling zone of the kiln bodies, and the external annular channel, the internal annular channel or the flue gas channel opening of the two kiln bodies are connected together through an external connecting channel. And a smoke port is arranged between the external annular channel or the internal annular channel and the kiln chamber.
The external annular channel is arranged outside the kiln body, the internal annular channel is arranged inside the kiln body, and the flue gas channel openings are formed in the outer walls of the two kiln bodies. The external annular channel is arranged around the outside of the kiln bodies through a bracket, and the external connecting channel is arranged between the two kiln bodies through a bracket. The waste gas discharge system comprises a dust remover, an induced draft fan and a chimney, and the dust remover, the induced draft fan and the chimney are connected in sequence. The kiln body is formed by rebuilding the kiln body of a beam lime kiln or a common shaft kiln. The fuel spray gun is an inserted burner, and the inserted burner is a gas fuel burner, a liquid fuel burner or a solid fuel burner or a combination of any two burners. The external annular channel and the external connecting channel are made of steel structures, and are lined with a heat-insulating layer and a wear-resistant layer. The built-in annular channel is of a steel structure and is externally lined with a heat insulation layer and a wear-resistant layer. The double-chamber kiln is provided with air cannons which are positioned around the kiln body and are connected to a calcining zone in the kiln body through pipelines.
The utility model discloses the two thorax kilns reconstructed by shaft kiln are through optimal design, set up external annular channel at beam type limekiln or ordinary shaft kiln, built-in annular channel or flue gas flue mouth, and be in the same place two kiln body coupling through external connecting channel, reconstruct beam type limekiln or ordinary shaft kiln into the two thorax kilns of concurrent flow formula, the productivity of device has been enlarged, energy consumption is reduced, the lime product quality is improved, adapt to multiple fuel, the effect of lime stone production lime is calcined to two thorax kilns has been realized, especially, be suitable for reconstructing on current limekiln basis. The kiln is reconstructed on the basis of the old kiln body, the existing resources are fully utilized, the construction investment is saved, and the economic benefit of enterprises is increased.
Drawings
FIG. 1 is a schematic view of a double-chamber kiln reconstructed from a shaft kiln according to the present invention;
FIG. 2 is a view A-A of FIG. 1;
FIG. 3 is a view B-B of FIG. 1;
FIG. 4 is a schematic view of another embodiment of the present invention;
fig. 5 is a view C-C of fig. 4.
Wherein: the device comprises a material inlet 1, a kiln body 2, a fuel spray gun 3, an external annular channel 4, an external connecting channel 5, a dust remover 6, a material outlet 7, a cooling fan 8, a cooling air inlet 9, a flue gas/combustion-supporting air port 10, a waste gas fan 11, a chimney 12, a combustion-supporting fan 13, a three-way valve 14, a support 15, an air gun 16, a flue gas port 17 and a flue gas port 18.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The protection scope of the present invention is not limited to the embodiments, and those skilled in the art can make any changes within the scope defined by the claims.
Example 1
The utility model discloses a double-chamber kiln reconstructed by shaft kiln is shown in figure 1, comprising two kiln bodies 2, a feeding system, a waste gas discharge system, a fuel supply system, a discharging system and a control system. The two kiln bodies 2 are formed by rebuilding the kiln bodies of the beam lime kiln, the outer shell of each kiln body is of a steel structure, and a heat-insulating layer and a wear-resistant layer are lined inside each kiln body. The two kiln bodies are a kiln chamber A and a kiln chamber B, the upper part of each kiln body is provided with a feed inlet 1, the lower part of each kiln body is provided with a discharge port 7, the feed inlets are connected with feeding equipment, and the discharge ports are connected with discharging equipment. Each kiln body comprises a preheating zone, a calcining zone and a cooling zone, the calcining zone is provided with 40 fuel spray guns 3, and the fuel spray guns are solid fuel plug-in type burners. The upper part of the preheating zone is provided with a flue gas/combustion-supporting air port 10 which is connected with a combustion-supporting fan 13 and a waste gas discharge system through a three-way valve 14. The waste gas discharge system comprises a dust remover 6, an induced draft fan 11 and a chimney 12, and the dust remover, the induced draft fan and the chimney are connected in sequence. An air cannon 16 and a cooling fan 8 are arranged outside the double-chamber kiln, a cooling air inlet 9 is arranged at the lower part of the cooling zone, and the cooling air inlet 9 is connected with the cooling fan 8. As shown in fig. 3, air cannons 16 are located at the four corners of the kiln body and are connected by piping to the calcining zone within the kiln body. External annular channels 4 are arranged outside the two kiln bodies 2 respectively, external connecting channels 5 are arranged between the two kiln bodies, the external annular channels 4 are installed around the outside of the kiln bodies through supports 15, and the external connecting channels 5 are installed between the two kiln bodies through the supports 15. As shown in figure 2, the external annular channels 4 of the two kiln bodies are connected together through an external connecting channel 5, and a smoke port 17 is arranged between the external annular channel 4 and the kiln chamber. The external annular channel and the external connecting channel are made of steel structures, and are lined with a heat-insulating layer and a wear-resistant layer.
The utility model discloses the operation process of the double-chamber kiln rebuilt by shaft kiln does, and when kiln chamber A calcines, fuel passes through 3 blowout fuels of kiln chamber A's fuel spray gun, and combustion-supporting wind gets into kiln chamber A from flue gas combustion-supporting wind gap 10 through three-way valve 14 and carries out combustion-supporting burning, calcines the lime stone material in the kiln chamber A. The flue gas generated by calcination is sent to the kiln chamber B through the external annular channel 4 and the external connecting channel 5 to preheat the materials in the kiln chamber, and then is sent to a waste gas discharge system through a flue gas/combustion-supporting tuyere 10 and a three-way valve 14 of the kiln chamber B to be discharged. When in calcination, the fuel is uniformly distributed on the cross section of the whole kiln chamber, and the temperature fields on the cross sections of the calcination zone are uniform, which is favorable for uniform calcination of limestone. And reversing after 12 minutes of operation, calcining in a kiln chamber B after reversing, storing heat in the kiln chamber A, alternately performing cocurrent flow calcination and countercurrent heat storage in the kiln chambers at two sides, and realizing automatic reversing operation through the action of a valve. The calcined lime enters a cooling zone, exchanges heat with cooling air entering from a cooling air inlet 9 to reduce the temperature of the lime to 60-80 ℃, and then is discharged from the kiln through a discharge hole 7. The temperature of the cooling air after lime cooling rises, the cooling air rises to the external annular channel 4 to be mixed with combustion flue gas, and then the cooling air enters the kiln chamber which is storing heat through the external connecting channel 5. The mixed gas and limestone directly carry out heat exchange, and the temperature is reduced to about 160-180 ℃ after the heat energy is transferred to the limestone, and the limestone is discharged by a waste gas discharge system. The external annular channel and the external connecting channel are arranged on the outer side of the kiln body, so that flue gas generated by combustion in one period can uniformly enter the external annular channel and enter another kiln chamber through the external connecting channel. The air cannons of the calcining zone are periodically sprayed to prevent material accumulation.
When blast furnace gas with low calorific value is used as fuel, gas fuel is inserted into the burner, and unburnt fuel in the calcining kiln chamber and lime cooling air from a cooling zone of the calcining kiln chamber are converged in an external connecting channel and then continuously combusted, so that the combustion efficiency is improved.
The annular channel can also be a built-in annular channel which is arranged on the inner side of the kiln body and is of a steel structure, and the outer lining is provided with a heat preservation layer and a wear-resistant layer. The kiln body structure supporting mode above the calcining zone can also adopt a bracket or a suspension cylinder mode. The section of the kiln body can also be a section with any shape.
Example 2
Another embodiment of the utility model is shown in fig. 4, including two kiln bodies 2, two kiln bodies 2 are rebuilt by the kiln body of beam type lime kiln and are formed, and kiln body shell is the steel construction, inside lining heat preservation and wearing layer. The two kiln bodies are a kiln chamber A and a kiln chamber B, the upper part of each kiln body is provided with a feed inlet 1, the lower part of each kiln body is provided with a discharge port 7, the feed inlets are connected with feeding equipment, and the discharge ports are connected with discharging equipment. Each kiln body comprises a preheating zone, a calcining zone and a cooling zone, the calcining zone is provided with 35 fuel spray guns 3, and the fuel spray guns are solid fuel plug-in type burners. The upper part of the preheating zone is provided with a flue gas/combustion-supporting air port 10 which is connected with a combustion-supporting fan 13 and a waste gas discharge system through a three-way valve 14. The two kiln bodies 2 are respectively provided with flue gas ports 18, and as shown in fig. 5, the flue gas ports 18 of the two kiln bodies are connected together through an external connecting channel 5. The other structures of the present invention are the same as those of embodiment 1.
The operation process of the embodiment is as follows: when the kiln chamber A is calcined, fuel is sprayed out through the fuel spray gun 3 of the kiln chamber A, combustion-supporting air enters the kiln chamber A from the flue gas/combustion-supporting air inlet 10 through the three-way valve 14 to be combusted in a combustion-supporting mode, and limestone materials in the kiln chamber A are calcined. The flue gas generated by calcination is sent to the kiln chamber B through the external connecting channel 5 to preheat the materials in the kiln chamber, and then is sent to a waste gas discharge system through a flue gas/combustion-supporting air port 10 and a three-way valve 14 of the kiln chamber B to be discharged. When in calcination, the fuel is uniformly distributed on the cross section of the whole kiln chamber, and the temperature fields on the cross sections of the calcination zone are uniform, which is favorable for uniform calcination of limestone. And reversing after 12 minutes of operation, calcining in a kiln chamber B after reversing, storing heat in the kiln chamber A, alternately performing cocurrent flow calcination and countercurrent heat storage in the kiln chambers at two sides, and realizing automatic reversing operation through the action of a valve. The calcined lime enters a cooling zone, exchanges heat with cooling air entering from a cooling air inlet 9 to reduce the temperature of the lime to 60-80 ℃, and then is discharged from the kiln through a discharge hole 7. The temperature of the cooling air after lime cooling rises, the cooling air is mixed with the combustion flue gas after rising, and then the mixture enters the kiln chamber which is storing heat through an external connecting channel 5. The mixed gas and limestone directly carry out heat exchange, and the temperature is reduced to about 160-180 ℃ after the heat energy is transferred to the limestone, and the limestone is discharged by a waste gas discharge system. Only one pipeline is arranged between the outer sides of the two kiln bodies to serve as an external connecting channel, so that flue gas generated by combustion in one period can uniformly enter the other kiln chamber. The air cannons of the calcining zone are periodically sprayed to prevent material accumulation.
When blast furnace gas with low calorific value is used as fuel, gas fuel is inserted into the burner, and unburnt fuel in the calcining kiln chamber and lime cooling air from a cooling zone of the calcining kiln chamber are converged in an external connecting channel and then continuously combusted, so that the combustion efficiency is improved.
The kiln body structure above the calcining zone can also adopt a bracket or suspension cylinder form; the section of the kiln body can also be a section with any shape.
Claims (8)
1. A double-chamber kiln reconstructed from a shaft kiln comprises two kiln bodies (2), a feeding system, a waste gas discharge system, a fuel supply system, a discharging system and a control system, wherein the upper part of each kiln body is provided with a feeding port (1), and the lower part of each kiln body is provided with a discharging port (7); the kiln body comprises a preheating zone, a calcining zone and a cooling zone, and the calcining zone is provided with at least one fuel spray gun (3); the upper part of the preheating zone is provided with a flue gas/combustion-supporting air port (10), and the flue gas/combustion-supporting air port is connected with a combustion-supporting fan (13) and a waste gas discharge system through a three-way valve (14); a cooling air inlet (9) is formed in the lower part of the cooling belt, and the cooling air inlet (9) is connected with a cooling fan (8); the method is characterized in that: an external annular channel (4) and an internal annular channel or a flue gas channel opening (18) are arranged between the calcining zone and the cooling zone of the kiln body (2), the external annular channels (4) and the internal annular channels or the flue gas channel openings (18) of the two kiln bodies are connected together through an external connecting channel (5), and a flue gas opening (17) is arranged between the external annular channel (4) or the internal annular channel and the kiln chamber.
2. The dual-chamber kiln as set forth in claim 1, wherein: the external annular channel (4) is arranged outside the kiln body (2), the internal annular channel is arranged inside the kiln body (2), and the flue gas port opening (18) is formed in the outer wall corresponding to the two kiln bodies.
3. The dual-chamber kiln as set forth in claim 1, wherein: the external annular channel (4) is arranged around the outside of the kiln bodies through a support (15), and the external connecting channel (5) is arranged between the two kiln bodies through the support (15).
4. The dual-chamber kiln as set forth in claim 1, wherein: the waste gas discharge system comprises a dust remover (6), an induced draft fan (11) and a chimney (12), wherein the dust remover, the induced draft fan and the chimney are sequentially connected.
5. The dual-chamber kiln as set forth in claim 1, wherein: the kiln body (2) is formed by reconstructing a beam type lime kiln or a common shaft kiln.
6. The dual-chamber kiln as set forth in claim 1, wherein: the fuel spray gun (3) is an inserted burner, and the inserted burner is a gas fuel burner, a liquid fuel burner or a solid fuel burner or a combination of any two burners.
7. The dual-chamber kiln as set forth in claim 1, wherein: the outer shells of the external annular channel (4) and the external connecting channel (5) are of steel structures, and are lined with a heat-insulating layer and a wear-resistant layer; the built-in annular channel is of a steel structure, and is externally lined with a heat insulation layer and a wear-resistant layer.
8. The dual-chamber kiln as set forth in claim 1, wherein: the double-hearth kiln is provided with air cannons (16) which are positioned around the kiln body and connected to a calcining zone in the kiln body through pipelines.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022044955.0U CN213739208U (en) | 2020-09-17 | 2020-09-17 | Double-chamber kiln reconstructed from shaft kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022044955.0U CN213739208U (en) | 2020-09-17 | 2020-09-17 | Double-chamber kiln reconstructed from shaft kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094058A (en) * | 2020-09-17 | 2020-12-18 | 石家庄新华能源环保科技股份有限公司 | Double-chamber kiln reconstructed from shaft kiln |
| CN114353505A (en) * | 2021-12-15 | 2022-04-15 | 广西柳州钢铁集团有限公司 | Environment-friendly efficient double-chamber kiln |
-
2020
- 2020-09-17 CN CN202022044955.0U patent/CN213739208U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094058A (en) * | 2020-09-17 | 2020-12-18 | 石家庄新华能源环保科技股份有限公司 | Double-chamber kiln reconstructed from shaft kiln |
| CN114353505A (en) * | 2021-12-15 | 2022-04-15 | 广西柳州钢铁集团有限公司 | Environment-friendly efficient double-chamber kiln |
| CN114353505B (en) * | 2021-12-15 | 2023-11-21 | 广西柳州钢铁集团有限公司 | Environment-friendly high-efficiency double-hearth kiln control method |
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