CN211585851U - Rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system - Google Patents
Rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system Download PDFInfo
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- CN211585851U CN211585851U CN201922280352.8U CN201922280352U CN211585851U CN 211585851 U CN211585851 U CN 211585851U CN 201922280352 U CN201922280352 U CN 201922280352U CN 211585851 U CN211585851 U CN 211585851U
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Abstract
The utility model relates to a fire-resistant lime industrial waste gas purification handles technical field, especially relates to a rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system. Comprises a flue gas pretreatment device, a dust removal and denitration integrated device, a chimney, a desulfurizer powder bin and desulfurizer grinding and conveying integrated equipment; the rotary kiln or the shaft kiln is connected with a flue gas pretreatment device through an original flue gas pipeline, the flue gas pretreatment device is connected with a dust removal and denitration integrated device through a desulfurization reaction pipeline, the dust removal and denitration integrated device is connected with a chimney through a flue gas purification pipeline, and a desulfurization and denitration induced draft fan is arranged on the flue gas purification pipeline; the desulfurizer powder bin is connected with the desulfurizer grinding and conveying integrated equipment through a pipeline, and the desulfurizer grinding and conveying integrated equipment is connected with the desulfurization reaction pipeline. The flue gas of the rotary kiln and the shaft kiln is discharged after dust removal, desulfurization, denitrification and purification treatment, so that the atmospheric pollution is reduced, the national industrial kiln pollutant discharge standard is met, and the clean production of the refractory lime industry is realized.
Description
Technical Field
The utility model relates to a fire-resistant lime industrial waste gas purification handles technical field, especially relates to a rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system.
Background
The history of calcining quicklime in China is long, the industry of refractory lime belongs to the high-pollution emission industry, and smoke dust discharged during calcining lime contains a large amount of harmful gases such as sulfur dioxide and nitrogen oxides and dust with the particle size of less than 10 microns. The harmful gas and dust can cause great harm to human body, if people inhale for a long time, respiratory diseases such as bronchus and lung can be caused, and the harm to children is more serious. The national stricter smoke emission standards in the industrial field promote the development of industrial flue gas purification treatment technology. The refractory lime industry is an integral part of industrial systems in China, and dust removal, desulfurization, denitrification and purification treatment are carried out on the flue gas discharged by the refractory lime industry, so that the method is a necessary way for realizing clean production of the refractory lime industry, meeting the requirements of energy conservation and environmental protection and building green plants.
SUMMERY OF THE UTILITY MODEL
In order to overcome prior art's not enough, the utility model provides a rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system, the utility model discloses remove dust, SOx/NOx control purification treatment back emission with the flue gas of rotary kiln and shaft kiln, reduce the atmosphere and pollute, reach national industrial furnace kiln pollutant emission standard, realize the clean production of fire-resistant lime trade.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a dust removal, desulfurization, denitrification and purification system for flue gas of a rotary kiln and a shaft kiln comprises a flue gas pretreatment device, a dust removal and denitrification integrated device, a chimney, a desulfurizer powder bin and desulfurizer grinding and conveying integrated equipment; the rotary kiln or the shaft kiln is connected with a flue gas pretreatment device through an original flue gas pipeline, the flue gas pretreatment device is connected with a dust removal and denitration integrated device through a desulfurization reaction pipeline, the dust removal and denitration integrated device is connected with a chimney through a flue gas purification pipeline, and a desulfurization and denitration induced draft fan is arranged on the flue gas purification pipeline; the desulfurizer powder bin is connected with the desulfurizer grinding and conveying integrated equipment through a pipeline, and the desulfurizer grinding and conveying integrated equipment is connected with the desulfurization reaction pipeline.
The dedusting and denitration integrated device comprises a bag type dedusting section, a denitration reaction section, a hot blast stove and a mixer; the bag-type dust removal section is connected with the denitration reaction section, and the denitration reaction section is respectively connected with the hot blast stove and the mixer.
The hot blast stove is connected with a smoke purifying pipeline; one end of the mixer is connected with the clean flue gas pipeline, an ammonia diluting fan is arranged on a pipeline connected with the mixer and the clean flue gas pipeline, and the other end of the mixer is connected with the ammonia pipeline.
And the lower part of the bag type dust removal section is provided with a pneumatic conveying device, and the pneumatic conveying device is connected with the desulfurization ash bin through a pneumatic conveying pipeline.
The flue gas pretreatment device is connected with a tail preheater of the rotary kiln or the shaft kiln; the length of the desulfurization reaction pipeline and the size of the section of the pipeline ensure that the flow time of the flue gas is more than 2 seconds.
The SOx/NOx control draught fan is frequency conversion regulation draught fan, and SOx/NOx control draught fan suction end is equipped with electrical control valve.
Compared with the prior art, the beneficial effects of the utility model are that:
1) SO in flue gas of rotary kiln and shaft kiln2The desulfurization pipeline and the bag type dust removal section are fully contacted with a desulfurizing agent to carry out two times of desulfurization reaction, so that the desulfurization efficiency is high;
2) the desulfurization pipeline replaces a desulfurization tower, and desulfurization, dust removal, denitration and denitration catalysts are thermally resolved to be integrated, so that initial investment, operation cost and floor area are saved;
3) bag-type dust removal is carried out before denitration, so that the abrasion consumption of flue gas on the denitration catalyst is reduced, and the denitration catalyst is saved;
4) the denitration catalyst is thermally analyzed on line, and an independent catalyst analyzing and regenerating system is not required to be arranged.
Drawings
Fig. 1 is a schematic structure and a schematic process diagram of the present invention.
In the figure: 1-lime rotary kiln or shaft kiln 2-pretreatment device 3-desulfurizer powder bin 4-desulfurizer grinding and conveying integrated equipment 5-desulfurization reaction pipeline 6-dust removal and denitration integrated device 7-bag type dust removal section 8-denitration reaction section 9-hot blast stove 10-mixer 11-ammonia dilution fan 12-desulfurization and denitration induced draft fan 13-chimney 14-raw flue gas pipeline 15-clean flue gas pipeline 16-pneumatic conveying device 17-desulfurization ash bin 18-pneumatic conveying pipeline 19-electric regulating valve
Detailed Description
The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings:
example (b):
as shown in fig. 1, a dedusting, desulfurization, denitrification and purification system for flue gas of a rotary kiln and a shaft kiln comprises a flue gas pretreatment device 2, a desulfurization reaction pipeline 5, a desulfurizer powder bin 3, a desulfurizer grinding and conveying integrated device 4, a dedusting and denitrification integrated device 6, a desulfurization and denitrification draught fan 12, a chimney 13, an original flue gas pipeline 14 and a clean flue gas pipeline 15.
The flue gas pretreatment device 2 is sequentially connected with a desulfurization reaction pipeline 5, a dust removal and denitration integrated device 6, a desulfurization and denitration fan 12 and a chimney 13 through pipelines. One end of the desulfurizer grinding and conveying integrated equipment 4 is connected to a desulfurization reaction pipeline 5, the desulfurizer is ground into powder and then conveyed into the desulfurization reaction pipeline 5, and meanwhile, the other end of the desulfurizer grinding and conveying integrated equipment is connected with a desulfurizer powder bin 3, and the desulfurizer with larger particles is obtained from the desulfurizer powder bin 3.
The dust removal and denitration integrated device 6 comprises a bag type dust removal section 7, a denitration reaction section 8, a hot blast stove 9, an ammonia dilution fan 11 and a mixer 10. The denitration reaction section 8 is respectively connected with a hot blast stove 9 and a mixer 10.
Hot-blast furnace 9 is connected with clean flue gas pipeline 15, and 10 one ends of blender link to each other with clean flue gas pipeline 15, and ammonia dilution fan 11 sets up on the pipeline that blender 10 links to each other with clean flue gas pipeline 15, and the 10 other ends of blender link to each other with the ammonia pipeline, inserts the extranet that provides the ammonia through the ammonia pipeline, dilutes the denitration reaction section 8 of sending into after reducing below the explosive concentration with clean flue gas with the ammonia.
The flue gas pretreatment device 2 is connected with the tail preheaters of the rotary kiln and the shaft kiln 1. The lower parts of the pretreatment device 2 and the bag type dust removal section 7 are provided with pneumatic conveying devices 16 which are connected with a desulfurization ash bin 17 through pneumatic conveying pipelines 18. The desulfurization and denitrification draught fan 12 has a frequency conversion adjusting function and can adjust the discharge amount of flue gas of the lime rotary kiln or the shaft kiln. An electric regulating valve 19 is arranged at the suction end of the desulfurization and denitrification draught fan 12, so that the exhaust gas discharge ports of the rotary kiln and the shaft kiln tail preheater maintain negative pressure of about 4500 Pa. And ammonia gas is sprayed in the denitration reaction section 8 after flue gas desulfurization.
The technical process of the utility model specifically comprises the following steps:
1) flue gas pretreatment: flue gas of the lime rotary kiln and the shaft kiln 1 leaves the tail preheater and then enters a flue gas pretreatment device 2, large particle dust with the particle size of more than 30 microns, such as CaO, MgO and the like in the flue gas are separated from the flue gas under the action of gravity settling and inertia, and enter a desulfurization ash bin 17 through a pneumatic conveying pipeline 18 under the action of a pneumatic conveying device 16.
2) Flue gas desulfurization: flue gas leaving the pretreatment device 2 and desulphurizing agent NaHCO ground into fine powder3Entering a desulfurization reaction pipeline 5 together, and adopting NaHCO in the desulfurization reaction pipeline 53Dry desulfurization, desulfurizing agent NaHCO3Thermally decomposed to highly reactive Na2CO3The flue gas flows in the desulfurization reaction pipeline 5 for more than 2 seconds, during which the SO in the flue gas2With highly reactive Na2CO3Fully contacting to perform primary desulfurization. Entering the bag type dust removal section 7 of the integrated desulfurization and denitrification device 6, and SO in the flue gas2And is attached toUnreacted Na in the filter bag2CO3And non-decomposed NaHCO3And carrying out secondary desulfurization reaction.
3) Flue gas dust removal: flue gases and dust (fly ash), Na2SO4、NaHSO3(desulfurized fly ash) and unreacted NaHCO3、Na2CO3The flue gas enters a bag type dust removal section 7 in the dust removal and denitration integrated device 6 together for filtering and dedusting, wherein the collected desulfurized ash and the collected dedusted ash are conveyed to a desulfurized ash bin 17 and a pretreatment device together through a pneumatic conveying device 16 and a pneumatic conveying pipeline 18, and the collected desulfurized ash and the collected dedusted ash are conveyed outside the automobile together, and the flue gas after desulfurization, dedusting and purification enters a denitration reaction section 8.
4) Flue gas denitration: mixing and diluting the ammonia gas connected with the outer net and the clean flue gas subjected to dust removal, desulfurization and denitrification in a mixer 10 through an ammonia gas dilution fan 11, and then sending the mixture into a denitrification reaction section 8 in the dust removal and denitrification integrated device 6, wherein the denitrification reaction section 8 adopts an NH3-SCR method and uses a low-temperature catalyst for denitrification; ammonia gas and NO in flue gas after desulfurization, dust removal and purificationXReacting under the condition of a low-temperature catalyst to generate nitrogen and water; meanwhile, a part of clean flue gas is heated by a hot blast stove 9 and is sent to a denitration reaction section 8 for on-line thermal analysis of the catalyst after participating in the denitration reaction, so that the catalyst can be recycled.
5) And (3) discharging flue gas: the clean flue gas after desulfurization, dust removal and denitration is discharged from a chimney 13 to the outside through a clean flue gas pipeline 15 under the action of a desulfurization and denitration induced draft fan 12.
The utility model discloses make SO in rotary kiln and shaft kiln flue gas2The desulfurization pipeline and the bag type dust removal section are fully contacted with a desulfurizing agent to carry out two times of desulfurization reaction, so that the desulfurization efficiency is high; the desulfurization pipeline replaces a desulfurization tower, and desulfurization, dust removal, denitration and denitration catalysts are thermally resolved to be integrated, so that initial investment, operation cost and floor area are saved; bag-type dust removal is carried out before denitration, so that the abrasion consumption of flue gas on the denitration catalyst is reduced, and the denitration catalyst is saved; the denitration catalyst is thermally analyzed on line, and an independent catalyst analyzing and regenerating system is not required to be arranged.
The utility model utilizes NaHCO3Dry desulfurization, bag type dust removal and NH3-SCR processThe online thermal desorption process of the nitrate and denitration catalyst is used for dedusting, desulfurizing, denitrating, purifying and then discharging flue gas of the rotary kiln and the shaft kiln, so that the atmospheric pollution is reduced, the national industrial kiln pollutant discharge standard is met, and the clean production of the refractory lime industry is realized.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system, wherein include the flue gas preconditioning plant, dust removal and NOx control integrated device, chimney, desulfurizer powder storehouse and desulfurizer grind and transport the integrated apparatus; the rotary kiln or the shaft kiln is connected with a flue gas pretreatment device through an original flue gas pipeline, the flue gas pretreatment device is connected with a dust removal and denitration integrated device through a desulfurization reaction pipeline, the dust removal and denitration integrated device is connected with a chimney through a flue gas purification pipeline, and a desulfurization and denitration induced draft fan is arranged on the flue gas purification pipeline; the desulfurizer powder bin is connected with the desulfurizer grinding and conveying integrated equipment through a pipeline, and the desulfurizer grinding and conveying integrated equipment is connected with the desulfurization reaction pipeline.
2. The rotary kiln and shaft kiln flue gas dedusting, desulfurization, denitrification and purification system as claimed in claim 1, wherein the dedusting and denitrification integrated device comprises a bag-type dedusting section, a denitrification reaction section, a hot blast stove and a mixer; the bag-type dust removal section is connected with the denitration reaction section, and the denitration reaction section is respectively connected with the hot blast stove and the mixer.
3. The system for dedusting, desulfurizing, denitrifying and purifying the flue gas of the rotary kiln and the shaft kiln as claimed in claim 2, wherein the hot blast stove is connected with a clean flue gas pipeline; one end of the mixer is connected with the clean flue gas pipeline, an ammonia diluting fan is arranged on a pipeline connected with the mixer and the clean flue gas pipeline, and the other end of the mixer is connected with the ammonia pipeline.
4. The rotary kiln and shaft kiln flue gas dedusting, desulfurization and denitration purification system as claimed in claim 2, wherein a pneumatic conveying device is arranged at the lower part of the bag type dedusting section, and the pneumatic conveying device is connected with the desulfurization ash bin through a pneumatic conveying pipeline.
5. The system for dedusting, desulfurizing, denitrifying and purifying the flue gas of the rotary kiln and the shaft kiln as recited in claim 1, wherein the flue gas pretreatment device is connected with a tail preheater of the rotary kiln or the shaft kiln; the length of the desulfurization reaction pipeline and the size of the section of the pipeline ensure that the flow time of the flue gas is more than 2 seconds.
6. The rotary kiln and shaft kiln flue gas dedusting, desulfurization and denitration purification system as claimed in claim 1, wherein the desulfurization and denitration induced draft fan is a variable frequency regulation induced draft fan, and an electric regulating valve is arranged at the suction end of the desulfurization and denitration induced draft fan.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922280352.8U CN211585851U (en) | 2019-12-18 | 2019-12-18 | Rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922280352.8U CN211585851U (en) | 2019-12-18 | 2019-12-18 | Rotary kiln and shaft kiln flue gas dust removal SOx/NOx control clean system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110841416A (en) * | 2019-12-18 | 2020-02-28 | 中冶焦耐(大连)工程技术有限公司 | Dedusting, desulfurization, denitrification and purification system and process for flue gas of rotary kiln and shaft kiln |
| CN114345120A (en) * | 2021-12-16 | 2022-04-15 | 中煤科工集团西安研究院有限公司 | Novel ultralow emission device and process for flue gas pollutants in dry cement process |
-
2019
- 2019-12-18 CN CN201922280352.8U patent/CN211585851U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110841416A (en) * | 2019-12-18 | 2020-02-28 | 中冶焦耐(大连)工程技术有限公司 | Dedusting, desulfurization, denitrification and purification system and process for flue gas of rotary kiln and shaft kiln |
| CN114345120A (en) * | 2021-12-16 | 2022-04-15 | 中煤科工集团西安研究院有限公司 | Novel ultralow emission device and process for flue gas pollutants in dry cement process |
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