CN212269893U - Low-nitrogen calcination ultralow-emission environment-friendly lime kiln - Google Patents
Low-nitrogen calcination ultralow-emission environment-friendly lime kiln Download PDFInfo
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- CN212269893U CN212269893U CN202022092068.0U CN202022092068U CN212269893U CN 212269893 U CN212269893 U CN 212269893U CN 202022092068 U CN202022092068 U CN 202022092068U CN 212269893 U CN212269893 U CN 212269893U
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Abstract
The utility model discloses a low nitrogen calcines ultralow emission type environmental protection lime kiln, its structural feature is: the flue gas outlet is connected with a flue gas mixer through a pipeline, the upper part of the flue gas mixer is connected with a humidifying and digesting feeder, and the lower part of the flue gas mixer is connected with a desulfurization flue; the bag-type dust remover is provided with three ends, the desulfurization flue is connected with the first end of the bag-type dust remover, and the second end of the bag-type dust remover is connected with the chimney through the smoke exhaust channel; the third end of the bag-type dust collector is connected with the ash conveying bucket lifting machine through a pipeline, the ash conveying bucket lifting machine is connected with the lime powder bin, and the lower part of the lime powder bin is connected with the humidifying and digesting feeder through a pipeline. The utility model has the advantages that: the utility model discloses an utilize desulfurization flue to carry out the desulfurization, the desulfurization ash passes through the sack cleaner separation, carries the ash conveyer through the fill and carries to furnace roof lime powder feed bin and send the desulfurization flue into the desulfurization ash humidification through humidification digestion dispenser again, realizes desulfurization ash high magnification cyclic utilization. The desulfurization efficiency is improved, and the cost for independently setting the desulfurization tower is saved.
Description
Technical Field
The utility model relates to a lime kiln, concretely relates to low nitrogen calcines ultralow emission type environmental protection lime kiln.
Background
At present, the quantity of domestic lime shaft kilns is very large, the production energy is different in size, most of lime shaft kilns are rough in production, dust and smoke emission pollution in the production process is serious, most enterprises are only provided with simple dust collectors and wet desulphurization tower devices, and increasingly strict environmental protection emission requirements are hardly met. An ultra-low emission type environment-friendly lime kiln process which can adapt to the production of a lime kiln and meet the future ultra-low emission requirement is urgently needed.
Disclosure of Invention
The utility model provides a low nitrogen calcines ultralow emission type environmental protection lime kiln, this lime kiln can make full use of kiln flue gas, desulfurization flue, lime carry out the harmless automatic processing of smoke and dust, saved the equipment investment promptly and realized the ultralow emission of flue gas again, and no waste water pollution, the lime-ash also can obtain comprehensive utilization.
In order to achieve the above purpose, the utility model adopts the following technical scheme: 1. a low-nitrogen calcination ultra-low emission type environment-friendly lime kiln mainly comprises a lime shaft kiln, a humidifying slaking feeder, a lime powder bin, a flue gas mixer, a desulfurization flue, a bag-type dust remover, an ash conveying bucket elevator, a chimney, a flue gas outlet and a smoke exhaust channel; the method is characterized in that: the lime shaft kiln is vertically arranged, and the topmost end of the lime shaft kiln is provided with a flue gas outlet; the flue gas outlet is connected with a flue gas mixer through a pipeline, the upper part of the flue gas mixer is connected with a humidifying and digesting feeder, and the lower part of the flue gas mixer is connected with a desulfurization flue; the bag-type dust remover is provided with three ends, the desulfurization flue is connected with the first end of the bag-type dust remover, and the second end of the bag-type dust remover is connected with the chimney through the smoke exhaust channel; the third end of the bag-type dust collector is connected with an ash conveying bucket elevator through a pipeline, the ash conveying bucket elevator is connected with a lime powder bin, and the lower part of the lime powder bin is connected with a humidifying and digesting feeder through a pipeline; forming a cyclic link.
Furthermore, the lime shaft kiln is made of steel materials, and the number of the lime shaft kilns is two.
Furthermore, an air distribution system is arranged in the lime shaft kiln, the air distribution system of one lime shaft kiln is connected with the air distribution system in the other lime shaft kiln through a smoke inlet channel, and a circulating fan is respectively arranged in the smoke inlet channels of the two lime shaft kilns; the other pipeline of the smoke inlet channel is connected with a chimney.
Furthermore, an induced draft fan is arranged in a pipeline, which is respectively connected with the chimney, of the smoke exhaust channel and the smoke inlet channel.
Furthermore, the heights of the humidifying and digesting feeder, the lime powder bin and the upper part of the ash conveying bucket elevator are all higher than the top of the lime shaft kiln, and the humidifying and digesting feeder is higher than the flue gas outlet of the lime shaft kiln.
Furthermore, the third end of the bag-type dust collector is an ash discharge port of the bag-type dust collector.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses a be equipped with circulating fan in advancing the cigarette passageway, will carry to advancing the cigarette passageway and then transport again to the lime shaft kiln through circulating fan through some flue gas after the sack cleaner purifies in the exhaust passage, make circulating fan function control flue gas circulation, effectively utilized the kiln flue gas to carry out flue gas recirculation to thereby can reach the low nitrogen through controlling flue gas circulation volume control income stove oxygen content and calcination temperature and calcine the denitration target. The utility model discloses an utilize desulfurization flue to carry out the desulfurization, the desulfurization ash passes through the sack cleaner separation, carries ash conveyer through the fill and carries to the lime powder feed bin and send the desulfurization flue into the desulfurization ash humidification through humidification digestion dispenser again, realizes desulfurization ash high magnification cyclic utilization. The desulfurization efficiency is improved, the cost for independently arranging the desulfurization tower is saved, and the flue gas after desulfurization is subjected to cloth bag dust removal to realize ultralow emission. The utility model discloses a lime production overall process smoke and dust innocent automatic processing has realized dust pollution-free, the clean production mode of being convenient for operation, installation maintenance and automation, can realize the ultralow emission of kiln flue gas.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the system comprises a lime shaft kiln, 2, a humidifying, digesting and feeding device, 3, a lime powder bin, 4, a flue gas mixer, 5, a desulfurization flue, 6, a bag-type dust remover, 7, an air distribution system, 8, a circulating fan, 9, an induced draft fan, 10, a bucket lifting and ash conveying machine, 11, a chimney, 12, a flue gas outlet, 13, a smoke exhaust channel and 14, a smoke inlet channel.
Detailed Description
Referring to fig. 1, a low-nitrogen calcination ultralow-emission environment-friendly lime kiln comprises a lime shaft kiln 1, a lime powder bin 3, a desulfurization flue 5, a bag-type dust remover 6, an induced draft fan 9, a bucket lifting and ash conveying machine 10, a chimney 11, a humidifying and digesting feeder 2 and a flue gas mixer 4, wherein the humidifying and digesting feeder 2 is arranged below the lime powder bin 3, the humidifying and digesting feeder 2 is respectively connected with the lime powder bin 3 and the flue gas mixer 4, the flue gas mixer 4 is connected with the desulfurization flue 5, a flue gas outlet 12 of the lime shaft kiln 1 is connected with the desulfurization flue 5 through the flue gas mixer 4, the desulfurization flue 5 is connected with the bag-type dust remover 6, the bag-type dust remover 6 is connected with the chimney 11 through a flue gas exhaust channel 13, the induced draft fan 9 is arranged in the flue gas exhaust channel 13, the flue gas inlet channel 14 is connected with the lime shaft kiln, a circulating fan 8 for flue gas circulation is arranged in the flue gas, the other end is connected with a lime powder bin 3. The utility model discloses a set up in advancing cigarette passageway 14 and be used for gas recirculation's circulating fan 8, carry some flue gas after 6 purifications of sack cleaner to advancing cigarette passageway 13 and then transport to lime shaft kiln 1 again from smoke exhaust passage 13 through circulating fan 8, make circulating fan 8 can control gas recirculation, the high efficiency has utilized the kiln flue gas to carry out gas recirculation to thereby can control through control gas recirculation volume and go into stove oxygen content and calcination temperature and reach the low nitrogen and calcine the denitration target. The utility model discloses an utilize desulfurization flue 5 to carry out the desulfurization, the desulfurization ash passes through 6 separations of sack cleaner, carries ash conveyer 10 through the fill and carries to lime powder feed bin 3 and send the desulfurization ash humidification into desulfurization flue 5 through humidification digestion dispenser 2 again, realizes desulfurization ash high magnification cyclic utilization. The desulfurization efficiency is improved, the cost for independently arranging the desulfurization tower is saved, and the flue gas after desulfurization is subjected to cloth bag dust removal to realize ultralow emission. The utility model discloses a lime production overall process smoke and dust innocent automatic processing has realized dust pollution-free, the clean production mode of being convenient for operation, installation maintenance and automation, can realize the ultralow emission of kiln flue gas.
The working principle of desulfurization by using the high-rate fly ash circulating desulfurization flue 5 is as follows: the lime powder is sent into the humidifying and digesting feeder 2 by a delivery pump, and enters the desulfurizing flue 5 after humidifying and digesting to be mixed and reacted with the sulfur-containing flue gas in the desulfurizing flue 5 to achieve the aim of desulfurizing. The unreacted and completely reacted slaked lime is lifted to a lime powder bin 3 through a hopper ash lifting and conveying machine 10 after being separated by a cloth bag, and the high-magnification cyclic utilization of the desulfurized lime is realized through a humidifying slaking feeder 2 and a desulfurization flue 5 again, the cyclic magnification can reach more than 200, the desulfurization efficiency is more than 90%, and the requirements of ultralow-emission desulfurization and dust removal can be completely met.
A clean flue gas circulation system is arranged in a flue gas outlet 12 pipeline of the bag-type dust collector 6, a part of flue gas enters a kiln cloth air system 7 through a recirculation fan 8, and the rest clean flue gas is discharged into a chimney 11 through a draught fan 9. One part of the clean flue gas after cloth bag dust removal is sent to a kiln air distribution system 7 through a recirculation fan 8, and the low-nitrogen calcination effect is achieved by changing and controlling the oxygen content at the inlet of the lime kiln and the calcination temperature of the kiln through controlling the circulation amount of the flue gas. The production of kiln nitrogen oxide is mainly caused by fuel coal calcination, overhigh calcination temperature and excessive air coefficient are main factors for producing the kiln nitrogen oxide, the balance of most circulating fans for ensuring yield and ventilation is large at present, so that the excessive air is far greater than the actual theoretical combustion air amount, after clean flue gas circulation is adopted, the oxygen content in the kiln can be adjusted through the flue gas circulation amount, after the oxygen content in the kiln is reduced, the theoretical combustion air amount is ensured, the ventilation of the kiln is not influenced, the generation of the nitrogen oxide caused by fuel calcination is realized and controlled, and low-nitrogen calcination is realized.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A low-nitrogen calcination ultra-low emission type environment-friendly lime kiln mainly comprises a lime shaft kiln, a humidifying slaking feeder, a lime powder bin, a flue gas mixer, a desulfurization flue, a bag-type dust remover, an ash conveying bucket elevator, a chimney, a flue gas outlet and a smoke exhaust channel; the method is characterized in that: the lime shaft kiln is vertically arranged, and the topmost end of the lime shaft kiln is provided with a flue gas outlet; the flue gas outlet is connected with a flue gas mixer through a pipeline, the upper part of the flue gas mixer is connected with a humidifying and digesting feeder, and the lower part of the flue gas mixer is connected with a desulfurization flue; the bag-type dust remover is provided with three ends, the desulfurization flue is connected with the first end of the bag-type dust remover, and the second end of the bag-type dust remover is connected with the chimney through the smoke exhaust channel; the third end of the bag-type dust collector is connected with an ash conveying bucket elevator through a pipeline, the ash conveying bucket elevator is connected with a lime powder bin, and the lower part of the lime powder bin is connected with a humidifying and digesting feeder through a pipeline; forming a cyclic link.
2. The low-nitrogen calcination ultra-low emission type environment-friendly lime kiln as claimed in claim 1, wherein: the lime shaft kiln is made of steel materials, and the number of the lime shaft kilns is two.
3. The low-nitrogen calcination ultra-low emission type environment-friendly lime kiln as claimed in claim 2, wherein: an air distribution system is arranged in the lime shaft kilns, the air distribution system of one lime shaft kiln is connected with the air distribution system in the other lime shaft kiln through a smoke inlet channel, and a circulating fan is arranged in the smoke inlet channels of the two lime shaft kilns respectively; the other pipeline of the smoke inlet channel is connected with a chimney.
4. The low-nitrogen calcination ultra-low emission type environment-friendly lime kiln as claimed in claim 3, wherein: wherein, the smoke exhaust channel and the smoke inlet channel are respectively provided with an induced draft fan in the pipeline connected with the chimney.
5. The low-nitrogen calcination ultra-low emission type environment-friendly lime kiln as claimed in claim 1, wherein: the heights of the humidifying and digesting feeder, the lime powder bin and the upper part of the ash conveying bucket elevator are all higher than the top of the lime shaft kiln, and the condition that the humidifying and digesting feeder is higher than the flue gas outlet of the lime shaft kiln is taken as the standard.
6. The low-nitrogen calcination ultra-low emission type environment-friendly lime kiln as claimed in claim 1, wherein: the third end of the bag-type dust collector is the dust discharge port of the bag-type dust collector.
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| CN202022092068.0U CN212269893U (en) | 2020-09-22 | 2020-09-22 | Low-nitrogen calcination ultralow-emission environment-friendly lime kiln |
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| CN202022092068.0U CN212269893U (en) | 2020-09-22 | 2020-09-22 | Low-nitrogen calcination ultralow-emission environment-friendly lime kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112047650A (en) * | 2020-09-22 | 2020-12-08 | 南昌江能热动工程技术有限责任公司 | Low-nitrogen calcination ultralow-emission environment-friendly lime kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112047650A (en) * | 2020-09-22 | 2020-12-08 | 南昌江能热动工程技术有限责任公司 | Low-nitrogen calcination ultralow-emission environment-friendly lime kiln |
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