CN112444138A - Trapping system for improving carbon dioxide content in cement kiln flue gas and working principle thereof - Google Patents

Trapping system for improving carbon dioxide content in cement kiln flue gas and working principle thereof Download PDF

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Publication number
CN112444138A
CN112444138A CN202011384308.2A CN202011384308A CN112444138A CN 112444138 A CN112444138 A CN 112444138A CN 202011384308 A CN202011384308 A CN 202011384308A CN 112444138 A CN112444138 A CN 112444138A
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China
Prior art keywords
pipeline
flue gas
kiln
control valve
carbon dioxide
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CN202011384308.2A
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Chinese (zh)
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吴涛
康宇
王东
桑圣欢
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Nanjing Kisen International Engineering Co Ltd
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Nanjing Kisen International Engineering Co Ltd
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Priority to CN202011384308.2A priority Critical patent/CN112444138A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/36—Arrangements of air or gas supply devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/42—Arrangement of controlling, monitoring, alarm or like devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

The invention relates to a capture system for improving the content of carbon dioxide in flue gas of a cement kiln and a working principle thereof, and the capture system comprises a kiln tail system, a waste heat boiler, a dust collector, a first pipeline, a second pipeline, a grate cooler, a rotary kiln, a tertiary air pipe and a raw material mill system, wherein an air outlet of the kiln tail system is connected with an air inlet of the waste heat boiler; the invention reduces the capture cost of carbon dioxide, fully ensures the oxygen concentration required by the combustion of cement raw materials to ensure the effective implementation of oxygen-enriched combustion, and is further beneficial to the complete decomposition of the cement raw materials, thereby improving the purity of combustion products.

Description

Trapping system for improving carbon dioxide content in cement kiln flue gas and working principle thereof
Technical Field
The invention relates to a capture system for improving the content of carbon dioxide in flue gas of a cement kiln and a working principle thereof.
Background
The greenhouse effect is currently receiving more and more global attention, and the combustion of fuel and the decomposition of raw meal during the cement production process can generate a large amount of CO2The emission concentration of the coal-fired power plant boiler flue gas is even higher than that of the coal-fired power plant boiler flue gas, and the cement industry becomes the CO in China like the steel industry and the coal-fired power industry2The main source of emissions.
Only about 21 percent of oxygen in common air participates in combustion, the rest 79 percent of nitrogen does not participate in combustion to form waste gas to take away a large amount of heat, and the oxygen-enriched combustion technology is a technology which adopts combustion-supporting gas with higher oxygen concentration than that in the air to combust, and even adopts pure oxygen to support combustion; the oxygen-enriched combustion technology is suitable for all fuels (gas, liquid and solid) and industrial boilers, and is widely applied to the fields of the steel industry and glass industrial kilns from the last 70 th century.
At present, the oxygen-enriched combustion technology is gradually applied in the limestone and cement industries, and the oxygen-enriched combustion technology is mainly applied in the cement industries for achieving the purposes of reducing coal consumption, improving the output of coal clinker per ton and reducing NOxThe purpose of discharging.
In order to prevent kiln tail flue gas generated in the combustion process of cement raw materials from being directly discharged outwards, carbon dioxide in the kiln tail flue gas must be captured, and then the carbon dioxide is extracted in a separation and purification mode, such as a chemical absorption method and the like, because the content of the carbon dioxide in the cement kiln tail flue gas is not high, a large amount of waste flue gas needs to be processed to capture, separate and purify the carbon dioxide with a large quantity, a device with a large capacity needs to be configured to store the carbon dioxide, and the capture cost is overhigh; if the content or the concentration of carbon dioxide in the kiln tail flue gas is increased, the concentration of oxygen in the kiln can be reduced due to the fact that the concentration of the carbon dioxide is too high, oxygen-enriched combustion cannot be effectively conducted, decomposition of cement raw materials is not facilitated, and the purity of combustion products is low to be further improved.
Disclosure of Invention
In view of the current situation of the prior art, the technical problem to be solved by the present invention is to provide a capture system for increasing the carbon dioxide content in the flue gas of a cement kiln and the working principle thereof, wherein the capture cost is reduced by increasing the carbon dioxide concentration in the flue gas of the cement kiln, the oxygen concentration required by the combustion of cement raw materials is fully ensured to ensure that the oxygen-enriched combustion is effectively carried out, and the purity of combustion products is increased.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an improve capture system of carbon dioxide content in cement kiln flue gas, including kiln tail system, exhaust-heat boiler, the dust collector, first pipeline, the second pipeline, the grate cooler, the rotary kiln, cubic tuber pipe and raw materials mill system, the air outlet of kiln tail system links to each other with exhaust-heat boiler's air intake, exhaust-heat boiler's air outlet links to each other with the air intake of dust collector, kiln tail system's discharge gate links to each other with the feed inlet of rotary kiln, the discharge gate of rotary kiln links to each other with the feed inlet of grate cooler, the high temperature end air outlet of grate cooler links to each other with kiln tail system's air intake through cubic tuber pipe, the air outlet of dust collector and the low temperature end air outlet of grate cooler link to each other with two air intakes of raw materials mill system through: still include third pipeline, fourth pipeline, fifth pipeline, circulating fan, first fan, oxygenerator, second fan and carbon entrapment refining plant, the both ends of fourth pipeline link to each other with the air outlet of dust collector and the high temperature end air intake of the cold machine of comb respectively, circulating fan and first fan are all located on the fourth pipeline, circulating fan locates the upstream side of first fan, the one end of third pipeline is connected on the air intake of carbon entrapment refining plant, the other end of third pipeline is connected on first pipeline, the one end of fifth pipeline is connected on the fourth pipeline, oxygenerator locates on the fifth pipeline, the air outlet of second fan links to each other with the low temperature end air intake of the cold machine of comb.
Preferably, the system further comprises a first control valve and a second control valve, wherein the first control valve is arranged on the fourth pipeline and is arranged on the upstream side of the circulating fan; the second control valve is arranged on the fifth pipeline and is arranged on the downstream side of the oxygen generating device.
Preferably, still include cold blast pipe and cold blast valve, the one end of cold blast pipe is connected on the fourth pipeline and is located the air intake department of first fan and locate between circulating fan and the first fan, and the cold blast valve is located on the cold blast pipe.
Preferably, the system further comprises a third control valve, a fourth control valve and a fifth control valve, wherein the third control valve is arranged on the second pipeline, the fourth control valve is arranged on the first pipeline and arranged on the downstream side of the third pipeline, and the fifth control valve is arranged on the third pipeline.
The working principle of the trapping system for improving the carbon dioxide content in the flue gas of the cement kiln comprises the following steps:
(1) when the kiln is opened for production, the high-temperature flue gas discharged from the kiln tail system is cooled after being recycled by the waste heat boiler, and then enters the dust collector to remove dust, and after the fourth control valve is opened, a part of flue gas discharged from the dust collector is introduced into the raw material grinding system to be used for drying cement raw materials; air with lower external temperature enters the interior of the high-temperature end of the grate cooler through the cold air pipe under the action of the first fan to play a cooling role.
(2) And opening the cold air valve and the first control valve, closing the second control valve and the fifth control valve, starting the circulating fan, feeding the other part of the flue gas coming out of the dust collector into the fourth pipeline under the action of the circulating fan, and then conveying the flue gas into the high-temperature end of the grate cooler by the first fan, so that the content of carbon dioxide in the air entering the kiln system is increased to improve the concentration of carbon dioxide in the flue gas at the tail of the kiln.
(3) Gradually reducing the opening of the cold air valve along with the increasing of the concentration of the carbon dioxide in the air sent into the high-temperature end of the grate cooler, gradually increasing the opening of the second control valve, and simultaneously starting the oxygen generator, so that high-concentration oxygen generated by the oxygen generator gradually enters the low-temperature end of the grate cooler to gradually replace air with lower external temperature entering the grate cooler through the cold air valve and the cold air pipe, and the oxygen content of the cooling gas entering the kiln system is improved to reduce the influence of the high-concentration carbon dioxide on the calcination of the fuel in the kiln system; in the implementation process, the air volume fed into the high-temperature end of the grate cooler is ensured to be enough to prevent the high-concentration oxygen introduced into the low-temperature end of the grate cooler from mixing into the high-temperature end of the grate cooler, so that the interference on the circulating flue gas containing high-concentration carbon dioxide is avoided.
(4) The concentration of oxygen entering the rotary kiln and the tertiary air pipe is continuously improved along with the gradual replacement of air entering from the cold air valve by high-concentration oxygen; meanwhile, along with the continuous entering of the circulating flue gas into the kiln system, the concentration of carbon dioxide in the flue gas generated by the rotary kiln and the kiln tail system is further improved; at the moment, opening the fifth control valve and starting the carbon capture refining device, wherein the flue gas with higher carbon dioxide concentration partially enters the carbon capture refining device to be captured and purified; through the operation, the concentration of the carbon dioxide in the kiln tail flue gas is improved, and the energy consumption cost of the later-stage carbon dioxide refining capture and purification is greatly reduced.
(5) After the carbon capture and purification device is operated, the operation load of the carbon capture and purification device is adjusted by adjusting the opening degrees of the first control valve and the fifth control valve and the power of the circulating fan.
(6) When the carbon capture refining device operates, the clinker is quenched by the circulating flue gas and the cold air with lower external temperature, so that the flue gas discharged by the waste heat boiler has lower temperature, and the flue gas entering the raw material mill system has lower temperature.
(8) When the carbon capture refining device runs and partial kiln tail waste gas is not enough for drying the raw material of the raw material grinding system, the third control valve is opened so that the waste gas discharged from the low-temperature end of the grate cooler is connected to the raw material grinding system, and partial hot air at the low-temperature end of the grate cooler enters the raw material grinding system to meet the requirement of drying the raw material.
(9) And when the carbon capture refining device does not operate, closing the first control valve, the circulating fan and the fifth control valve, and ensuring that the cold air valve is in an open state, so that all kiln tail flue gas is led into the raw material mill system.
Compared with the prior art, the invention has the advantages that: the invention improves the concentration of carbon dioxide in the flue gas of the cement kiln, and further can collect the carbon dioxide in the flue gas at the tail of the kiln in time without specially configuring a device with larger capacity to store the carbon dioxide, thereby reducing the collection cost, fully ensuring the oxygen concentration required by the combustion of cement raw materials to ensure the effective implementation of oxygen-enriched combustion, further being beneficial to the complete decomposition of the cement raw materials, and further improving the purity of combustion products.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a position diagram of the first control valve, the second control valve, the cold air duct, and the cold air valve of the present invention;
fig. 3 is a position diagram of the third, fourth and fifth control valves of the present invention.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
As shown in fig. 1 to 3, a capture system for increasing the carbon dioxide content in flue gas of a cement kiln comprises a kiln tail system 1, a waste heat boiler 2, a dust collector 3, a first pipeline 20, a second pipeline 21, a grate cooler 8, a rotary kiln 9, a tertiary air duct 10 and a raw material mill system 15, wherein an air outlet of the kiln tail system 1 is connected with an air inlet of the waste heat boiler 2, an air outlet of the waste heat boiler 2 is connected with an air inlet of the dust collector 3, a material outlet of the kiln tail system 1 is connected with a material inlet of the rotary kiln 9, a material outlet of the rotary kiln 9 is connected with a material inlet of the grate cooler 8, an air outlet at a high temperature end of the grate cooler 8 is connected with an air inlet of the kiln tail system 1 through the tertiary air duct 10, and an air outlet at a low temperature end of the dust collector 3 and an air outlet of the grate cooler 8 are respectively connected; the carbon capture refining device comprises a dust collector 3, a grate cooler 8, a circulating fan 5, a first fan 6, an oxygen generating device 12, a second fan 13 and a carbon capture refining device 18, wherein two ends of the fourth pipeline 23 are respectively connected with an air outlet of the dust collector 3 and an air inlet of a high-temperature end of the grate cooler 8, the circulating fan 5 and the first fan 6 are arranged on the fourth pipeline 23, the circulating fan 5 is arranged on the upstream side of the first fan 6, one end of the third pipeline 22 is connected with an air inlet of the carbon capture refining device 18, the other end of the third pipeline 22 is connected onto the first pipeline 20, one end of the fifth pipeline 24 is connected onto the fourth pipeline 23, the oxygen generating device 12 is arranged on the fifth pipeline 24, and an air outlet of the second fan 13 is connected with an air inlet of a low-temperature end of the grate cooler 8.
As shown in fig. 2, the capture system for increasing the carbon dioxide content in the flue gas of the cement kiln further comprises a first control valve 4 and a second control valve 11, wherein the first control valve 4 is arranged on the fourth pipeline 23 and is arranged on the upstream side of the circulating fan 5; the second control valve 11 is provided on the fifth pipe 24 and on the downstream side of the oxygen production plant 12.
As shown in FIG. 2, the capture system for increasing the carbon dioxide content in the flue gas of the cement kiln further comprises a cold air pipe 19 and a cold air valve 7, wherein one end of the cold air pipe 19 is connected to a fourth pipeline 23 and is arranged at an air inlet of the first fan 6 and is arranged between the circulating fan 5 and the first fan 6, and the cold air valve 7 is arranged on the cold air pipe 19.
As shown in FIG. 3, the capturing system for increasing the carbon dioxide content in the flue gas of the cement kiln further comprises a third control valve 14, a fourth control valve 16 and a fifth control valve 17, wherein the third control valve 14 is arranged on the second pipeline 21, the fourth control valve 16 is arranged on the first pipeline 20 and is arranged at the downstream side of the third pipeline 22, and the fifth control valve 17 is arranged on the third pipeline 22.
The working principle of the trapping system for improving the carbon dioxide content in the flue gas of the cement kiln comprises the following steps:
(1) when the kiln is opened for production, high-temperature flue gas discharged from the kiln tail system 1 is recycled by the waste heat boiler 2 and then cooled, and then enters the dust collector 3 to remove dust, and after the fourth control valve 16 is opened, a part of flue gas discharged from the dust collector 3 is introduced into the raw material grinding system 15 to be used for drying cement raw materials; air with lower external temperature enters the interior of the high-temperature end of the grate cooler 8 through the cold air pipe 19 under the action of the first fan 6 to play a cooling role.
(2) And opening the cold air valve 7 and the first control valve 4, closing the second control valve 11 and the fifth control valve 17, starting the circulating fan 5, feeding the other part of flue gas coming out of the dust collector 3 into a fourth pipeline 23 under the action of the circulating fan 5, and then sending the flue gas into the high-temperature end of the grate cooler 8 by the first fan 6, so that the content of carbon dioxide in the air entering the kiln system is increased to improve the concentration of carbon dioxide in the flue gas at the tail of the kiln.
(3) Along with the increasing of the concentration of carbon dioxide in the air sent into the interior of the high-temperature end of the grate cooler 8, the opening degree of the cold air valve 7 is gradually reduced, the opening degree of the second control valve 11 is gradually increased, and the oxygen making device 12 is started at the same time, so that high-concentration oxygen generated by the oxygen making device 12 gradually enters the interior of the low-temperature end of the grate cooler 8 to gradually replace the air with lower external temperature entering the grate cooler 8 through the cold air valve 7 and the cold air pipe 19, and the oxygen content of the cooling gas entering the kiln system is improved to reduce the influence of the high-concentration carbon dioxide on the fuel calcination in the kiln system; in the implementation process, the air volume sent by the high-temperature end of the grate cooler 8 is ensured to be enough to prevent the high-concentration oxygen introduced into the low-temperature end of the grate cooler 8 from mixing into the high-temperature end of the grate cooler 8, so that the interference to the circulating flue gas containing high-concentration carbon dioxide is avoided.
(4) The concentration of oxygen entering the rotary kiln 9 and the tertiary air pipe 10 is continuously improved along with the gradual replacement of air entering from the cold air valve 7 by high-concentration oxygen; meanwhile, along with the continuous entering of the circulating flue gas into the kiln system, the concentration of carbon dioxide in the flue gas generated by the rotary kiln 9 and the kiln tail system 1 is further improved; at this time, the fifth control valve 17 is opened and the carbon capture and purification device 18 is started, and part of the flue gas with higher carbon dioxide concentration enters the carbon capture and purification device 18 for capture and purification; through the operation, the concentration of the carbon dioxide in the kiln tail flue gas is improved, and the energy consumption cost of the later-stage carbon dioxide refining capture and purification is greatly reduced.
(5) After the carbon-trapping refining device 18 is operated, the operation load of the carbon-trapping refining device 18 is adjusted by adjusting the opening degrees of the first control valve 4 and the fifth control valve 17 and the power of the circulation fan 5.
(6) When the carbon capture refining device 18 is in operation, the clinker is quenched by the circulating flue gas and the cold air with lower external temperature, so that the flue gas discharged by the waste heat boiler 2 has lower temperature, and the flue gas entering the raw material mill system 15 has lower temperature.
(8) When the carbon capture refining device 18 is in operation and part of kiln tail waste gas is not enough for drying the raw material of the raw material grinding system 15, the third control valve 14 is opened, so that the waste gas discharged from the low-temperature end of the grate cooler 8 is connected to the raw material grinding system 15, and part of hot air at the low-temperature end of the grate cooler 8 enters the raw material grinding system 15 to meet the requirement for drying the raw material.
(9) When the carbon capture refining device 18 does not operate, the first control valve 4, the circulating fan 5 and the fifth control valve 17 are closed, the cold air valve 7 is ensured to be in an open state, and all kiln tail flue gas is led into the raw material mill system 15.
The invention improves the concentration of carbon dioxide in the flue gas of the cement kiln, and further can collect the carbon dioxide in the flue gas at the tail of the kiln in time without specially configuring a device with larger capacity to store the carbon dioxide, thereby reducing the collection cost, fully ensuring the oxygen concentration required by the combustion of cement raw materials to ensure the effective implementation of oxygen-enriched combustion, further being beneficial to the complete decomposition of the cement raw materials, and further improving the purity of combustion products.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. The utility model provides an improve capture system of carbon dioxide content in cement kiln flue gas, including kiln tail system, exhaust-heat boiler, the dust collector, first pipeline, the second pipeline, the grate cooler, the rotary kiln, cubic tuber pipe and raw materials mill system, the air outlet of kiln tail system links to each other with exhaust-heat boiler's air intake, exhaust-heat boiler's air outlet links to each other with the air intake of dust collector, kiln tail system's discharge gate links to each other with the feed inlet of rotary kiln, the discharge gate of rotary kiln links to each other with the feed inlet of grate cooler, the high temperature end air outlet of grate cooler links to each other with kiln tail system's air intake through cubic tuber pipe, the air outlet of dust collector and the low temperature end air outlet of grate cooler link to each other with two air intakes of raw materials mill system through: still include third pipeline, fourth pipeline, fifth pipeline, circulating fan, first fan, oxygenerator, second fan and carbon entrapment refining plant, the both ends of fourth pipeline link to each other with the air outlet of dust collector and the high temperature end air intake of the cold machine of comb respectively, circulating fan and first fan are all located on the fourth pipeline, circulating fan locates the upstream side of first fan, the one end of third pipeline is connected on the air intake of carbon entrapment refining plant, the other end of third pipeline is connected on first pipeline, the one end of fifth pipeline is connected on the fourth pipeline, oxygenerator locates on the fifth pipeline, the air outlet of second fan links to each other with the low temperature end air intake of the cold machine of comb.
2. The capture system for increasing the content of carbon dioxide in the flue gas of the cement kiln according to claim 1, characterized in that: the first control valve is arranged on the fourth pipeline and is arranged on the upstream side of the circulating fan; the second control valve is arranged on the fifth pipeline and is arranged on the downstream side of the oxygen generating device.
3. The capture system for increasing the content of carbon dioxide in the flue gas of the cement kiln according to claim 1, characterized in that: still include cold blast pipe and cold blast valve, the one end of cold blast pipe is connected on the fourth pipeline and is located the air intake department of first fan and locate between circulating fan and the first fan, and the cold blast valve is located on the cold blast pipe.
4. The capture system for increasing the content of carbon dioxide in the flue gas of the cement kiln according to claim 1, characterized in that: the pipeline control device is characterized by further comprising a third control valve, a fourth control valve and a fifth control valve, wherein the third control valve is arranged on the second pipeline, the fourth control valve is arranged on the first pipeline and arranged on the downstream side of the third pipeline, and the fifth control valve is arranged on the third pipeline.
5. The working principle of the trapping system for improving the carbon dioxide content in the flue gas of the cement kiln comprises the following steps:
(1) when the kiln is opened for production, the high-temperature flue gas discharged from the kiln tail system is cooled after being recycled by the waste heat boiler, and then enters the dust collector to remove dust, and after the fourth control valve is opened, a part of flue gas discharged from the dust collector is introduced into the raw material grinding system to be used for drying cement raw materials; air with lower external temperature enters the interior of the high-temperature end of the grate cooler through the cold air pipe under the action of the first fan to play a cooling role.
(2) And opening the cold air valve and the first control valve, closing the second control valve and the fifth control valve, starting the circulating fan, feeding the other part of the flue gas coming out of the dust collector into the fourth pipeline under the action of the circulating fan, and then conveying the flue gas into the high-temperature end of the grate cooler by the first fan, so that the content of carbon dioxide in the air entering the kiln system is increased to improve the concentration of carbon dioxide in the flue gas at the tail of the kiln.
(3) Gradually reducing the opening of the cold air valve along with the increasing of the concentration of the carbon dioxide in the air sent into the high-temperature end of the grate cooler, gradually increasing the opening of the second control valve, and simultaneously starting the oxygen generator, so that high-concentration oxygen generated by the oxygen generator gradually enters the low-temperature end of the grate cooler to gradually replace air with lower external temperature entering the grate cooler through the cold air valve and the cold air pipe, and the oxygen content of the cooling gas entering the kiln system is improved to reduce the influence of the high-concentration carbon dioxide on the calcination of the fuel in the kiln system; in the implementation process, the air volume fed into the high-temperature end of the grate cooler is ensured to be enough to prevent the high-concentration oxygen introduced into the low-temperature end of the grate cooler from mixing into the high-temperature end of the grate cooler, so that the interference on the circulating flue gas containing high-concentration carbon dioxide is avoided.
(4) The concentration of oxygen entering the rotary kiln and the tertiary air pipe is continuously improved along with the gradual replacement of air entering from the cold air valve by high-concentration oxygen; meanwhile, along with the continuous entering of the circulating flue gas into the kiln system, the concentration of carbon dioxide in the flue gas generated by the rotary kiln and the kiln tail system is further improved; at the moment, opening the fifth control valve and starting the carbon capture refining device, wherein the flue gas with higher carbon dioxide concentration partially enters the carbon capture refining device to be captured and purified; through the operation, the concentration of the carbon dioxide in the kiln tail flue gas is improved, and the energy consumption cost of the later-stage carbon dioxide refining capture and purification is greatly reduced.
(5) After the carbon capture and purification device is operated, the operation load of the carbon capture and purification device is adjusted by adjusting the opening degrees of the first control valve and the fifth control valve and the power of the circulating fan.
(6) When the carbon capture refining device operates, the clinker is quenched by the circulating flue gas and the cold air with lower external temperature, so that the flue gas discharged by the waste heat boiler has lower temperature, and the flue gas entering the raw material mill system has lower temperature.
(7) When the carbon capture refining device runs and partial kiln tail waste gas is not enough for drying the raw material of the raw material grinding system, the third control valve is opened so that the waste gas discharged from the low-temperature end of the grate cooler is connected to the raw material grinding system, and partial hot air at the low-temperature end of the grate cooler enters the raw material grinding system to meet the requirement of drying the raw material.
(8) And when the carbon capture refining device does not operate, closing the first control valve, the circulating fan and the fifth control valve, and ensuring that the cold air valve is in an open state, so that all kiln tail flue gas is led into the raw material mill system.
CN202011384308.2A 2020-11-30 2020-11-30 Trapping system for improving carbon dioxide content in cement kiln flue gas and working principle thereof Pending CN112444138A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113803990A (en) * 2021-09-24 2021-12-17 中信锦州金属股份有限公司 Method for treating smoke of vanadium extraction rotary kiln by using burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113803990A (en) * 2021-09-24 2021-12-17 中信锦州金属股份有限公司 Method for treating smoke of vanadium extraction rotary kiln by using burner
CN113803990B (en) * 2021-09-24 2023-11-21 中信锦州金属股份有限公司 Method for treating vanadium extraction rotary kiln flue gas by using burner

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