CN211770955U - Double-hearth lime kiln with denitration equipment - Google Patents
Double-hearth lime kiln with denitration equipment Download PDFInfo
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- CN211770955U CN211770955U CN201922271389.4U CN201922271389U CN211770955U CN 211770955 U CN211770955 U CN 211770955U CN 201922271389 U CN201922271389 U CN 201922271389U CN 211770955 U CN211770955 U CN 211770955U
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Abstract
The utility model relates to a two thorax limekilns with denitration device, including two kiln thorax, feeding system, ash discharge system, fuel system, air feed system and exhaust emission system. The upper part of the kiln chamber is provided with a feed inlet and a smoke outlet, and the lower part of the kiln chamber is provided with a discharge outlet. A preheating zone, a calcining zone and a cooling zone are arranged in the kiln chamber, and the calcining zone is provided with an inserted burner. The double-hearth lime kiln is provided with a denitration agent preparation unit, at least 1 denitration beam is arranged in each kiln hearth, and the denitration beams are arranged in a calcining zone or a preheating zone. The denitration roof beam is equipped with the denitration nozzle, and the denitration roof beam is connected to denitration agent preparation unit. The utility model discloses an add denitration roof beam and denitration spray gun in two thorax limekilns, the oxynitrides of flue gas among the effective desorption limestone calcination process reduces the nitrogen oxide content that the limekiln discharged the flue gas, is favorable to protecting natural environment, has apparent social.
Description
Technical Field
The utility model belongs to the technical field of industrial furnace tail gas treatment, a two thorax limekilns with denitration device is related to.
Background
The flue gas is the main discharge of the lime kiln and is mixed gas generated by burning combustible materials in a kiln chamber and decomposing limestone. Since the flue gas contains a large amount of nitrogen oxides NOx, such as NO, which, if discharged directly into the atmosphere, pollute the air, form photochemical smog and acid rain, and are harmful to human health, the flue gas must be subjected to denitrification (i.e., denitration) before being discharged.
At present, the flue gas denitration technology mainly comprises two types: selective Catalytic Reduction (SCR) technology and selective non-catalytic reduction (SNCR) technology. The selective non-catalytic reduction (SNCR) denitration is to spray a reducing agent containing amino into a region with the flue gas temperature of 850-50 ℃ under the condition of not using a catalyst so as to selectively reduce NOx in the flue gas into N2And H2And O, so as to achieve the purpose of reducing nitrogen oxide emission. In addition, spraying reducing agents such as methane, hydrogen, carbon monoxide and the like into the high-temperature flue gas also has a certain denitration effect. The SNCR denitration technology in the prior art is applied to a circulating fluidized bed boiler, the denitration efficiency is 30-50%, the SNCR denitration technology is not found to be applied to the field of lime kiln flue gas denitration, and the prior art cannot fully meet the quality requirement of lime kiln flue gas emission.
Disclosure of Invention
The utility model aims at providing a two thorax limekilns with denitration device improves denitration effect to reduce the nitrogen oxide content that limekiln discharged the flue gas, satisfy the fume emission standard.
The technical scheme of the utility model is that: a double-chamber lime kiln with denitration equipment comprises two kiln chambers, a feeding system, an ash discharging system, a fuel system, an air supply system and a waste gas discharge system. The upper part of the kiln chamber is provided with a feed inlet and a smoke outlet, and the lower part of the kiln chamber is provided with a discharge outlet. A preheating zone, a calcining zone and a cooling zone are arranged in the kiln chamber, and the calcining zone is provided with an inserted burner. The double-hearth lime kiln is provided with a denitration agent preparation unit, at least 1 denitration beam is arranged in each kiln hearth, and the denitration beams are arranged in a calcining zone or a preheating zone. The denitration roof beam is equipped with the denitration nozzle, and the denitration roof beam is connected to denitration agent preparation unit.
The denitration beam includes but is not limited to a cylindrical structure or a box-type structure, and the denitration nozzle includes but is not limited to a lower portion of the cylindrical structure or the box-type structure. The denitration roof beam is equipped with the passageway of cooling medium circulation, and the passageway of cooling medium circulation is connected with the conduction oil circulation system, and the cooling medium includes but not limited conduction oil or air.
Flue gas channels are arranged at the lower parts of the two kiln chambers, denitration spray guns are arranged on the flue gas channels, and the denitration spray guns are connected to the denitration agent preparation unit. Denitration roof beam is replaced by peripheral denitration nozzle, replaces denitration roof beam with peripheral denitration nozzle and sprays the denitrifier and carries out the denitration. Peripheral denitration nozzle can insert in the lime kiln, makes the denitrifier spray more evenly.
The denitration agent preparation unit comprises a denitration agent storage tank, a liquid evaporating pot, a buffer tank, a mixer and a fan, wherein the denitration agent storage tank is connected to the mixer through the liquid evaporating pot and the buffer tank, and the fan is connected to the mixer through an air pipeline. The mixer is connected to the denitration beams and the denitration spray guns of the kiln chambers on the two sides. The denitration agent in the denitration agent storage tank comprises but is not limited to ammonia water with mass concentration of 20% -25% or urea solution with mass concentration of 30% -50%
The waste gas discharge system is provided with a chimney, an induced draft fan and a dust remover, the smoke outlets of the kiln chambers at two sides are connected to the dust remover through a three-way valve, and the outlet of the dust remover is connected to the chimney through the induced draft fan. The operating regime for a double-chamber lime kiln includes, but is not limited to, the following: when the kiln chamber A is burnt, a denitration agent is simultaneously sprayed into a denitration beam in the kiln chamber B and a denitration spray gun of a flue gas channel at the side of the kiln chamber A; after the direction is changed, the kiln chamber B is burnt, and the denitration agent is sprayed into the denitration spray gun of the denitration beam in the kiln chamber A and the denitration spray gun of the flue gas channel at the side of the kiln chamber B. The switching-over operation is realized through the opening and closing of the valve 10 on the denitration branch pipeline.
Through add denitration roof beam and denitration spray gun in two thorax limekilns, utilize the denitration nozzle of denitration roof beam and the denitration spray gun of flue gas passageway to spout the denitrifier into the preheating zone or the calcining zone of two thorax limekilns, the oxynitrides of flue gas in the effective desorption lime calcination process reduces the nitrogen oxide content of limekilns exhaust flue gas, and NOx emission concentration reduces to accord with national emission standard, has alleviateed atmospheric pollution, is favorable to protecting the natural environment, has showing social.
Drawings
FIG. 1 is a schematic structural view of a double-chamber lime kiln with a denitration system of the utility model;
wherein: 1-chimney, 2-draught fan, 3-dust remover, 4-three-way valve, 5-kiln chamber, 6-plug-in burner, 7-denitration nozzle, 8-denitration spray gun, 9-feed inlet, 11-denitration roof beam, 12-discharge gate, 13-blender, 14-buffer tank, 15-liquid evaporating pot, 16-denitrifier storage tank, 17-fan.
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.
The utility model discloses two thorax limekilns with denitration device is shown in figure 1, including two kiln thorax 5, feeding system, ash discharge system, fuel system, air feed system and exhaust emission system. The upper part of the kiln chamber is provided with a feed inlet 9 and a flue gas outlet, the lower part of the kiln chamber is provided with a discharge outlet 12, the feed inlet is connected with a feeding system, the flue gas outlet is connected to a waste gas discharge system through a three-way valve, and the discharge outlet is connected to an ash discharge system. A preheating zone, a calcining zone and a cooling zone are arranged in the kiln chamber, flue gas channels are arranged at the lower parts of the two kiln chambers, and the flue gas channels are provided with denitration spray guns 8. The calcining zone is provided with an inserted burner 6 which is connected with a fuel system. The double-hearth lime kiln is provided with a denitration agent preparation unit, 3 denitration beams 11 are respectively arranged in the kiln hearths 5 on two sides of the double-hearth lime kiln, and the denitration beams 11 are arranged on the lower portion of the plug-in burner 6. The denitration beam 11 is a cylindrical structure, and the denitration nozzle 7 is arranged at the lower part of the beam body of the cylindrical structure. The denitration beam 11 is provided with a channel for circulation of a cooling medium, the channel for circulation of the cooling medium is connected with a heat conduction oil circulating system, and the heat conduction oil can be replaced by air. The denitration agent preparation unit comprises a denitration agent storage tank 16, a liquid evaporation tank 15, a buffer tank 14, a mixer 13 and a fan 17, wherein the denitration agent of the denitration agent storage tank 16 is ammonia water. The denitration agent storage tank 16 is connected to the mixer 13 through the liquid evaporation tank 15 and the buffer tank 14, and the fan 17 is connected to the mixer 13 through an air pipe. The mixer 13 is connected to the denitration beams 11 of the kiln chambers on the two sides and the denitration spray gun 8 of the flue gas channel through a denitration pipeline, and the connecting pipeline is provided with a valve 10. The waste gas discharge system is provided with a chimney 1, an induced draft fan 2 and a dust remover 3, smoke outlets of the kiln chamber A and the kiln chamber B on two sides are connected to the dust remover 3 through a three-way valve, and the dust remover is connected to the chimney through the induced draft fan.
The utility model discloses double-chamber limekiln with denitration device's operation process does: liquid ammonia is conveyed to a denitration agent storage tank by a tank car, the liquid ammonia output by the denitration agent storage tank is evaporated into ammonia gas in a liquid evaporator, and the ammonia gas is heated to normal temperature and then conveyed to a buffer tank 14 for later use. The ammonia in the buffer tank is through the air-vent valve decompression back, passes through the blender with the dilution wind that dilutes the fan and mixes, and the concentration of ammonia is far less than the explosion lower limit in the blender, generally controls about 5%. And thirdly, conveying the mixed denitration agent of the mixer to the denitration beam 11 through the denitration pipeline, spraying the denitration agent to the calcining zone of the kiln chamber through the denitration nozzle 7 and spraying the denitration agent into the flue gas through the denitration spray guns 8 of the flue gas channels at the lower parts of the two kiln chambers. The denitrifier is ammonia gas mixed gas and nitrogen oxide in the flue gas are subjected to chemical reaction to generate nitrogen and water, and the nitrogen oxide is removed, so that the aim of denitration is fulfilled. The denitration agent sprayed by the spray gun in the flue gas channel is subjected to primary denitration, and the denitration agent sprayed by the denitration beam is subjected to secondary denitration. According to the process requirements, the control of the spraying amount of the denitration agent of the calcining zone and the flue gas channel in the kiln chamber is realized by adjusting the valve 10 from the denitration pipeline to the denitration beam 11 and the branch pipeline of the denitration spray gun 8.
And the denitration beam of the kiln chamber A and the denitration beam of the kiln chamber B are subjected to reversing operation through opening and closing of the valve according to the requirement of the calcining process. The denitration beam 11 and the denitration lance 8 may be used alone or in combination. The denitration beam can also be matched with a denitration spray gun arranged at the channel, the combustion-supporting air inlet, the plug-in burner and the lime cooling air inlet, or can be used independently.
When the kiln chamber A is burnt, the denitration agent is simultaneously sprayed into the denitration spray gun of the denitration beam in the kiln chamber B and the flue gas channel on the side of the kiln chamber A. After the direction is changed, the kiln chamber B is burnt, and the denitration agent is sprayed into the denitration spray gun of the denitration beam in the kiln chamber A and the denitration spray gun of the flue gas channel at the side of the kiln chamber B. The switching-over operation is realized through the opening and closing of the valve 10 on the denitration branch pipeline.
The denitration agent is sprayed to the periphery burner nozzles instead of the denitration beams to realize denitration, and the denitration spray gun can be inserted into the lime kiln, so that denitration is more uniform.
And allowing denitration to be performed in the channel, and adding a denitration beam on the basis of channel denitration to perform secondary denitration. Denitration spray guns can be additionally arranged in the channel, and denitration is carried out for the first time through the denitration spray guns in the channel.
Claims (8)
1. A double-chamber lime kiln with denitration equipment comprises two kiln chambers (5), a feeding system, an ash discharging system, a fuel system, an air supply system and a waste gas discharge system, wherein the upper part of each kiln chamber is provided with a feeding hole (9) and a flue gas outlet, and the lower part of each kiln chamber is provided with a discharging hole (12); be equipped with preheating zone, calcining zone and cooling zone in the kiln thorax, calcining zone is provided with bayonet nozzle (6), characterized by: the double-hearth lime kiln is provided with a denitration agent preparation unit, at least 1 denitration beam (11) is arranged in each kiln hearth, and the denitration beams (11) are arranged in a calcining zone or a preheating zone; denitration roof beam (11) are equipped with denitration nozzle (7), and denitration roof beam (11) are connected to denitration agent preparation unit.
2. The double-chamber lime kiln with a denitration device as set forth in claim 1, wherein: the denitration beam (11) is of a cylindrical structure or a box-type structure, and the denitration nozzle (7) is positioned at the lower part of the cylindrical structure or the box-type structure.
3. The double-chamber lime kiln with a denitration device as set forth in claim 1, wherein: the denitration beam (11) is provided with a channel for circulating a cooling medium, the channel for circulating the cooling medium is connected with a heat conduction oil circulating system, and the cooling medium is heat conduction oil or air.
4. The double-chamber lime kiln with a denitration device as set forth in claim 1, wherein: flue gas channels are arranged at the lower parts of the two kiln chambers (5), the flue gas channels are provided with denitration spray guns (8), and the denitration spray guns are connected to a denitration agent preparation unit.
5. The double-chamber lime kiln with a denitration device as set forth in claim 1, wherein: the denitration beam (11) is replaced by a peripheral denitration nozzle, and the peripheral denitration nozzle is used for replacing the denitration beam to spray a denitration agent for denitration; the peripheral denitration nozzle can be inserted into the lime kiln, so that the denitration agent is sprayed more uniformly.
6. The double-chamber lime kiln with a denitration device as set forth in claim 1, wherein: the denitration agent preparation unit comprises a denitration agent storage tank (16), a liquid evaporation tank (15), a buffer tank (14), a mixer (13) and a fan (17), wherein the denitration agent storage tank (16) is connected to the mixer (13) through the liquid evaporation tank (15) and the buffer tank (14), and the fan (17) is connected to the mixer (13) through an air pipeline; the mixer (13) is connected to the denitration beams (11) and the denitration spray guns (8) of the kiln chambers on the two sides.
7. The double-chamber lime kiln with a denitration device as set forth in claim 6, wherein: the denitration agent in the denitration agent storage tank (16) is ammonia water with the mass concentration of 20% -25% or urea solution with the mass concentration of 30% -50%.
8. The double-chamber lime kiln with a denitration device as set forth in claim 1, wherein: the waste gas discharge system is provided with a chimney (1), an induced draft fan (2) and a dust remover (3), the smoke outlets of the kiln chambers on two sides are connected to the dust remover (3) through a three-way valve, and the dust remover outlet is connected to the chimney through the induced draft fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922271389.4U CN211770955U (en) | 2019-12-17 | 2019-12-17 | Double-hearth lime kiln with denitration equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922271389.4U CN211770955U (en) | 2019-12-17 | 2019-12-17 | Double-hearth lime kiln with denitration equipment |
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| CN211770955U true CN211770955U (en) | 2020-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479607A (en) * | 2020-12-01 | 2021-03-12 | 石家庄新华能源环保科技股份有限公司 | Hanging cylinder type parallel-flow heat storage double-hearth kiln with cooling structure |
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2019
- 2019-12-17 CN CN201922271389.4U patent/CN211770955U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479607A (en) * | 2020-12-01 | 2021-03-12 | 石家庄新华能源环保科技股份有限公司 | Hanging cylinder type parallel-flow heat storage double-hearth kiln with cooling structure |
| CN112479607B (en) * | 2020-12-01 | 2022-05-20 | 石家庄新华能源环保科技股份有限公司 | Hanging cylinder type parallel-flow heat storage double-hearth kiln with cooling structure |
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