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WO2025055293A1 - Procédé et système à base de clinker de ciment calciné pour obtenir un gaz de combustion à haute concentration de dioxyde de carbone - Google Patents

Procédé et système à base de clinker de ciment calciné pour obtenir un gaz de combustion à haute concentration de dioxyde de carbone Download PDF

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Publication number
WO2025055293A1
WO2025055293A1 PCT/CN2024/082048 CN2024082048W WO2025055293A1 WO 2025055293 A1 WO2025055293 A1 WO 2025055293A1 CN 2024082048 W CN2024082048 W CN 2024082048W WO 2025055293 A1 WO2025055293 A1 WO 2025055293A1
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WO
WIPO (PCT)
Prior art keywords
fan
carbon dioxide
heat exchange
flue gas
speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/082048
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English (en)
Chinese (zh)
Inventor
张超
王彬
张思才
马爱国
陶瑛
迟大亮
张婉君
郑现明
邓玉华
姚秀丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBMI CONSTRUCTION Co Ltd
CBMI Construction Co Ltd
Original Assignee
CBMI CONSTRUCTION Co Ltd
CBMI Construction Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CBMI CONSTRUCTION Co Ltd, CBMI Construction Co Ltd filed Critical CBMI CONSTRUCTION Co Ltd
Publication of WO2025055293A1 publication Critical patent/WO2025055293A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 specially adapted for rotary-drum furnaces
    • 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 specially adapted for rotary-drum furnaces
    • F27B7/34—Arrangements of heating 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 specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling 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 specially adapted for 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases

Definitions

  • the present disclosure relates to the technical field of cement calcination, and in particular to a method and system for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker.
  • the carbon dioxide capture system is used to remove carbon dioxide from the gas stream or separate carbon dioxide as a gas product. Capture is the first step of carbon capture and storage (CCS technology). Carbon dioxide needs to be present in a high purity during transportation and storage, and in most cases the concentration of carbon dioxide in industrial exhaust gas does not meet this requirement, so carbon dioxide must be separated from the exhaust gas. This process is called carbon dioxide capture. Carbon dioxide capture systems can be divided into several categories, such as chemical absorption, physical absorption, physical adsorption, membrane separation, and cryogenic separation. When applied, the capture method and equipment must be selected based on the actual characteristics and parameters of the carbon dioxide emission source.
  • the embodiments of the present disclosure provide a method and system for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker, which can obtain high-concentration carbon dioxide flue gas with low energy consumption.
  • the present disclosure provides a system for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker, comprising: a rotary kiln, a smoke chamber and a kiln head cover are respectively arranged at the tail and the head of the rotary kiln, and the rotary kiln surrounds an electromagnetic induction device along the length direction; a pressure sensor and a gas analyzer are arranged in the kiln head cover;
  • the air cooling device being connected to the kiln head cover and used for cooling the clinker produced by the rotary kiln heating and calcining the raw material via the electromagnetic induction device by air, the kiln head cover being provided with a hot air duct for guiding out the air after the heat exchange;
  • a first heat exchange device connected to the smoke chamber, used for heat exchange between raw meal and smoke generated by calcining the raw meal in the rotary kiln, the first heat exchange device comprising a first raw meal inlet for introducing raw meal and a first raw meal outlet for leading the raw meal after heat exchange to the smoke chamber;
  • a second heat exchange device connected to the smoke chamber and the hot air duct respectively, used for exchanging heat between the raw meal and the air after heat exchange, the second heat exchange device comprising a second raw meal inlet for introducing the raw meal and a second raw meal outlet for leading the raw meal after heat exchange to the smoke chamber;
  • a flue gas duct connected to the first heat exchange device, wherein the flue gas duct is provided with a first fan for discharging the flue gas after heat exchange;
  • a control device the control device is respectively connected to the pressure sensor, the gas analyzer, the first fan and the second fan, and the control device is used to: when the carbon dioxide concentration monitored by the gas analyzer is greater than a threshold value, control the rotation speed of the first fan to gradually increase until it stays at a rotation speed that can reduce the carbon dioxide concentration to the threshold value, during which the pressure value monitored by the pressure sensor is within a preset range value; if in the process of controlling the rotation speed of the first fan to gradually increase, the pressure value monitored by the pressure sensor is greater than the upper limit of the preset range value, control the rotation speed of the second fan to gradually decrease, at this time the rotation speed of the first fan remains unchanged, until the first fan and the second fan remain at a rotation speed that can reduce the carbon dioxide concentration to the threshold value and the pressure value to the preset range value; if in the process of controlling the rotation speed of the second fan to gradually decrease, the carbon dioxide concentration has not yet dropped to the threshold when the pressure value monitored by the pressure sensor is less than the lower limit of the preset range value
  • the raw material in the rotary kiln is heated and calcined by an electromagnetic induction device, and the raw material decomposes to release carbon dioxide gas.
  • the rotation speed of the first fan and the second fan is regulated by the control device to control the carbon dioxide concentration to a threshold value and the pressure value to a preset range value, so that the carbon dioxide flue gas and the air after heat exchange each take their own paths and do not mix, thereby further ensuring a high concentration of carbon dioxide;
  • the entire system uses air to cool the clinker, and uses the carbon dioxide flue gas and the air after heat exchange to preheat the raw material, so that energy is reused and energy consumption is low.
  • the first heat exchange device comprises a plurality of cyclones arranged from top to bottom, the bottom material outlet of the lowest cyclone is connected to the smoke chamber, the gas inlet of the lowest cyclone is connected to the smoke chamber, and the top gas outlet of the highest cyclone is connected to the smoke duct; wherein the gas outlet of the lower cyclone is connected to the upper cyclone through a connecting duct, and the bottom material outlet of the upper cyclone is connected to the lower connecting duct;
  • the raw material is fed into the connecting pipe located at the top.
  • the second heat exchange device also includes a plurality of cyclone barrels arranged from top to bottom, the bottom material outlet of the cyclone barrel located at the bottom is connected to the smoke chamber, the gas inlet of the cyclone barrel located at the bottom is connected to the hot air duct, and the top gas outlet of the cyclone barrel located at the top is connected to the air duct; wherein the gas outlet of the cyclone barrel located at the bottom is connected to the cyclone barrel located at the top through a connecting pipe, and the bottom material outlet of the cyclone barrel located at the top is connected to the connecting pipe at the bottom;
  • the raw material is fed into the connecting pipe located at the top.
  • the wind cooling device includes a grate cooler, and a blower for introducing air is arranged at the bottom of the grate cooler.
  • the ratio of raw materials fed into the first heat exchange device and the second heat exchange device is 1:(2-5).
  • the flue gas discharged from the flue gas duct is further processed by a dust collector, and the processed flue gas can be connected to a carbon dioxide capture system.
  • the flue gas duct and/or the air duct is also connected to a waste heat boiler.
  • the present disclosure further provides a method for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker.
  • the system based on the above technical solution specifically comprises the following steps:
  • the raw material is heated and decomposed in a rotary kiln equipped with an electromagnetic induction device to produce carbon dioxide gas, while being calcined into clinker;
  • the flue gas containing the carbon dioxide gas generated by decomposition enters the first heat exchange device through the smoke chamber, and the clinker passes through the kiln head
  • the hood enters the air cooling device to exchange heat with the air for cooling, and the air after heat exchange enters the second heat exchange device;
  • the raw material Before entering the rotary kiln, the raw material is put into the first heat exchange device and the second heat exchange device respectively to exchange heat with the flue gas and air. After the heat exchange, the raw material enters the rotary kiln through the smoke chamber for calcination.
  • the flue gas and air after the heat exchange are discharged through the flue gas duct and the air duct respectively; wherein, the flue gas discharged through the flue gas duct is a high-concentration carbon dioxide flue gas, and the carbon dioxide concentration in the flue gas is greater than 80%;
  • the first fan when the carbon dioxide concentration monitored by the gas analyzer is greater than the threshold value, gradually increases the speed until it stays at the speed when the carbon dioxide concentration drops to the threshold value, and the pressure value monitored by the pressure sensor during this period is always within the preset range value; in the above process, if the pressure value monitored by the pressure sensor is greater than the upper limit of the preset range value but the carbon dioxide concentration has not dropped to the threshold value while the first fan is gradually increasing the speed, the second fan begins to gradually reduce the speed, while the first fan maintains the speed unchanged, until the first fan and the second fan respectively stay at the speeds when the carbon dioxide concentration drops to the threshold value and the pressure value drops to the preset range value; in the above process, if the second fan is gradually reducing the speed, the carbon dioxide concentration still does not drop to the threshold when the pressure value is less than the lower limit of the preset range value, the first fan continues to gradually increase the speed, while the second fan maintains the speed unchanged; repeat the above steps until the first fan and the second fan stay at the speeds when the carbon
  • the beneficial effects that can be obtained are at least:
  • the raw material in the rotary kiln is heated and calcined by an electromagnetic induction device, and the raw material decomposes to release carbon dioxide gas.
  • no air is introduced, no flue gas is generated from the combustion of fuel, the amount of waste gas is greatly reduced, and the carbon dioxide concentration in the generated carbon dioxide flue gas is high;
  • the rotation speed of the first fan and the second fan is regulated by the control device, and the carbon dioxide concentration is controlled to drop to a threshold value and the pressure value to drop to a preset range value, so as to prevent the carbon dioxide gas released by the decomposition of the raw material in the rotary kiln from mixing with the air after heat exchange, thereby further ensuring a high concentration of carbon dioxide.
  • FIG1 is an overall schematic diagram of a system for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker according to an embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram showing the connection between a control device and a pressure sensor, a gas analyzer, a first fan and a second fan in a system for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker according to an embodiment of the present disclosure.
  • the present disclosure provides a system 100 for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker, which is applied in the field of cement calcining technology to solve the problem of low carbon dioxide concentration in flue gas generated by existing cement calcining processes.
  • the system 100 includes a rotary kiln 110, an air cooling device, a first heat exchange device 130, a second heat exchange device 140, a flue gas duct 150, an air duct 160, and a control device 170.
  • the rotary kiln 110 is used to heat and calcine raw materials.
  • the air cooling device is used to air-cool the clinker generated by calcining the raw materials.
  • the first heat exchange device 130 is used to preheat the raw materials fed into the rotary kiln 110 with flue gas.
  • the second heat exchange device 140 is used to preheat the raw materials fed into the rotary kiln 110 with air.
  • the flue gas duct 150 is used to discharge the flue gas generated by the rotary kiln 110 to obtain high-concentration carbon dioxide flue gas.
  • the air duct 160 is used to discharge the air after heat exchange.
  • the control device 170 is used to control the pressure balance in the kiln head hood 112 so that the carbon dioxide flue gas generated in the rotary kiln 110 and the air passing through the kiln head hood 112 are not mixed to ensure a high concentration of carbon dioxide in the flue gas.
  • a smoke chamber 111 and a kiln head cover 112 are respectively provided at the tail and head of the rotary kiln 110.
  • the raw material enters the rotary kiln 110 through the smoke chamber 111.
  • the smoke is discharged outward through the smoke chamber 111.
  • the clinker is guided outward through the kiln head cover 112.
  • the rotary kiln 110 is a rotatable cylindrical structure.
  • the rotary kiln 110 may include an inlet section, a sintering section, and a cooling section.
  • the rotary kiln 110 surrounds an electromagnetic induction device 113 along the length direction, for example, an electromagnetic induction coil.
  • High-frequency alternating current generates an alternating magnetic field through the coil, causing the rotary kiln 110 to generate eddy current self-heating.
  • the raw material in the rotary kiln 110 is heated to decompose carbonates, and the decomposition product CaO of the raw material during the process of moving diffuses with SiO 2 , Fe 2 O 3 , Al 2 O 3 and the like in the raw material to react in a solid phase to form clinker minerals. In this process, carbonates decompose to produce carbon dioxide.
  • a pressure sensor 114 and a gas analyzer 115 are provided in the kiln head hood 112.
  • the pressure sensor 114 is used to monitor the pressure data in the kiln head hood 112 in real time.
  • the gas analyzer 115 is used to monitor the carbon dioxide concentration in the kiln head hood 112 in real time, and to understand whether the air in the kiln head hood 112 is mixed with smoke by monitoring whether the carbon dioxide concentration exceeds the normal carbon dioxide content in the air (the carbon dioxide content in the air is 0.03%).
  • the air cooling device is connected to the kiln head cover 112.
  • the air cooling device is used to use air to cool the clinker produced by heating and calcining raw materials in the rotary kiln 110 via the electromagnetic induction device 113.
  • the kiln head cover 112 is configured to conduct air after heat exchange.
  • the air cooling device may be a prior art device.
  • the air cooling device may be a grate cooler 120.
  • a blower 121 for introducing air may be provided at the bottom of the grate cooler 120.
  • the cooling gas in this embodiment may be air, or other cooling gases may be used, and the gas object monitored by the gas analyzer 115 may be adaptively adjusted accordingly.
  • the first heat exchange device 130 is connected to the smoke chamber 111.
  • the first heat exchange device 130 is used for heat exchange between raw materials and smoke generated by calcining raw materials in the rotary kiln 110.
  • the first heat exchange device 130 includes a first raw material inlet for introducing raw materials and a first raw material outlet for leading the raw materials after heat exchange to the smoke chamber 111.
  • the first heat exchange device 130 can be a prior art device.
  • the second heat exchange device 140 is connected to the smoke chamber 111 and the hot air duct 122 respectively.
  • the second heat exchange device 140 is used for heat exchange between the raw material and the air after heat exchange.
  • the second heat exchange device 140 includes a second raw material inlet for introducing the raw material and a second raw material outlet for leading the raw material after heat exchange to the smoke chamber 111.
  • the second heat exchange device 140 can be a prior art device.
  • the flue gas duct 150 is connected to the first heat exchange device 130.
  • the flue gas duct 150 is equipped with a first fan 151 for discharging the flue gas after heat exchange. Under normal circumstances, the first fan 151 operates at a certain speed.
  • the air duct 160 is connected to the second heat exchange device 140.
  • the air duct 160 is equipped with a second fan 161 for discharging the air after the secondary heat exchange. Under normal circumstances, the second fan 161 operates at a certain speed.
  • the control device 170 is connected to the pressure sensor 114, the gas analyzer 115, the first fan 151 and the second fan 161 respectively.
  • the control device 170 controls the rotation speed of the first fan 151 to gradually increase until it stays at the rotation speed when the carbon dioxide concentration drops to the threshold value, during which the pressure value monitored by the pressure sensor 114 is within the preset range, for example, between negative 10Pa and negative 35Pa.
  • the control device 170 controls the rotation speed of the second fan 161 to gradually decrease, and the rotation speed of the first fan 151 remains unchanged (i.e., the rotation speed when the second fan 161 starts to be adjusted) until the first fan 151 and the second fan 161 stay at the rotation speed when the carbon dioxide concentration drops to the threshold value and the pressure value drops to the preset range.
  • the control device 170 controls the speed of the first fan 151 to continue to increase gradually, and the speed of the second fan 161 remains unchanged (i.e., the speed at which the speed of the first fan 151 is adjusted is maintained). The above process is repeated until the first fan 151 and the second fan 161 stay at the speed at which the carbon dioxide concentration drops to the threshold value and the pressure value drops to within the preset range value.
  • control device 170 cooperates with the pressure sensor 114, the gas analyzer 115, and the first fan 151
  • the adjustment made with the second fan 161 is aimed at achieving a pressure balance point in the rotary kiln 110 at the kiln outlet end (near the kiln head hood 112), so that the carbon dioxide gas generated by the thermal decomposition of the raw materials in the rotary kiln 110 is discharged only through the rotary kiln 110, the smoke chamber 111 and the first heat exchange device 130, and the air that exchanges heat with the clinker passes through the kiln head hood 112 and is discharged only through the hot air duct 122 and the second heat exchange device 140, and the two are not mixed, thereby ensuring a high concentration of carbon dioxide in the flue gas.
  • the first heat exchange device 130 may include a plurality of cyclones 180 arranged from top to bottom.
  • the number of cyclones 180 may not be limited, for example, it may be 5, 6 or other numbers.
  • the bottom material outlet of the cyclone 180 located at the bottom is connected to the smoke chamber 111.
  • the gas inlet of the cyclone 180 located at the bottom is connected to the smoke chamber 111.
  • the top gas outlet of the cyclone 180 located at the top is connected to the flue gas duct 150.
  • the gas outlet of the cyclone 180 located at the bottom is connected to the cyclone 180 located at the top through the connecting pipe 181.
  • the bottom material outlet of the cyclone 180 located at the top is connected to the connecting pipe 181 at the bottom.
  • the raw material is put into the connecting pipe 181 located at the top.
  • the second heat exchange device 140 may also include a plurality of cyclones 180 arranged from top to bottom.
  • the number of cyclones 180 may not be limited, for example, it may be 5, 6 or other numbers.
  • the bottom material outlet of the cyclone 180 located at the bottom is connected to the smoke chamber 111.
  • the gas inlet of the cyclone 180 located at the bottom is connected to the hot air duct 122.
  • the top gas outlet of the cyclone 180 located at the top is connected to the air duct 160.
  • the gas outlet of the cyclone 180 located at the bottom is connected to the cyclone 180 located at the top through the connecting duct 181.
  • the bottom material outlet of the cyclone 180 located at the top is connected to the connecting duct 181 at the bottom.
  • the raw material is put into the connecting duct 181 located at the top.
  • the ratio of raw materials fed into the first heat exchanger 130 and the second heat exchanger 140 is 1:(2-5). For example, about 1/4 of the raw materials are fed into the first heat exchanger 130, and about 3/4 of the raw materials are fed into the second heat exchanger 140.
  • the raw meal is fed from the connecting pipe 181 between the cyclone C2A and C1-A1, C1-A2, and the connecting pipe 181 between C2B and C1-B1, C1-B2 of the first heat exchange device 130. About 1/4 of the raw meal is fed into the connecting pipe 181 between C2A and C1-A1, C1-A2, and 3/4 of the raw meal is fed into the connecting pipe 181 between C2B and C1-B1, C1-B2.
  • the raw meal is dispersed and heat-exchanged in the connecting pipe 181, and enters the cyclone C1-A1, C1-A2, C1-B1, C1-B2 with the air flow.
  • the raw meal is separated in the cyclone 180, and the gas is discharged from the top of the cyclone 180.
  • the cyclone C1-A1 and C1-A2 discharges high-concentration carbon dioxide flue gas, and the cyclone C1-B1 and C1-B2 discharges hot air.
  • the raw meal is collected in the cone of the cyclone 180 and discharged.
  • the raw meal discharged from the cone of C1-A1 and C1-A2 cyclones is fed into the connecting pipe 181 between C2A and C3A; the raw meal discharged from the cone of C1-B1 and C1-B2 cyclones is fed into the connecting pipe 181 between C2B and C3B.
  • the raw meal is dispersed and heat-exchanged in the connecting pipe 181, and enters the C2A and C2B cyclones with the airflow.
  • the material gas is separated in the cyclone 180, and the gas is discharged from the top of the cyclone 180.
  • the C2A cyclone discharges high-concentration carbon dioxide flue gas
  • the C2B cyclone discharges hot air.
  • the raw meal is collected in the cone of C2A and C2B cyclones and discharged. Similarly, the materials pass through the C3A, C3B, C4A, C4B, C5A, C5B, C6A, C6B cyclones, and the raw meal after heating is finally discharged from the cone of C6A and C6B cyclones and fed into the smoke chamber 111.
  • the raw material After heating, the raw material is fed into the smoke chamber 111 and then enters the rotary kiln 110.
  • the high-frequency alternating current generates an alternating magnetic field through the coil, causing the rotary kiln 110 to generate eddy current self-heating.
  • the raw material is heated in the kiln to decompose carbonates.
  • the decomposition product CaO of the material during the process diffuses with SiO 2 , Fe 2 O 3 , Al 2 O 3 and the like in the raw material to react in the solid phase to form clinker minerals.
  • the material passes through the kiln, completing the above clinker calcination process.
  • the carbon dioxide gas generated by the decomposition of carbonates is transported from the kiln and the kiln tail smoke chamber 111 to the inlet of the cyclone C6A.
  • the calcined clinker is fed into the front section of the grate cooler 120.
  • the clinker moves continuously from the inlet to the outlet on the grate cooler 120, and at the same time exchanges heat with the air entering from the blower 121 at the bottom of the grate cooler 120, completing the cooling of the clinker and heat recovery.
  • the high-temperature hot air of 700-850 degrees enters the inlet of the cyclone C6B through the kiln head cover 112 and the hot air duct 122.
  • the pressure balance point in the kiln is located at the kiln outlet.
  • the end (close to the kiln head cover 112) is used to realize that the CO2 decomposed in the kiln only goes through the rotary kiln 110 and enters the kiln tail smoke chamber 111, and the high-temperature hot air only enters the hot air duct 122 through the kiln head cover 112, so that the two gases each go their own way and do not mix.
  • Excess preheat at the tail end of the grate cooler 120 is discharged from the tail end and can enter the waste heat boiler 190 or be used for drying materials, etc.
  • the present disclosure also provides a method for obtaining high-concentration carbon dioxide flue gas based on calcining cement clinker, and a system 100 based on the above technical solution.
  • the method specifically comprises the following steps:
  • the flue gas containing the decomposed carbon dioxide gas enters the first heat exchange device 130 through the smoke chamber 111.
  • the clinker enters the air cooling device through the kiln head cover 112 to exchange heat with the air for cooling, and the air after heat exchange enters the second heat exchange device 140.
  • the raw material Before entering the rotary kiln 110, the raw material is respectively put into the first heat exchange device 130 and the second heat exchange device 140 for heat exchange with flue gas and air. After heat exchange, the raw material enters the rotary kiln 110 through the smoke chamber 111 for calcination.
  • the flue gas and air after heat exchange are discharged through the flue gas duct 150 and the air duct 160 respectively; wherein, the flue gas discharged through the flue gas duct 150 is high-concentration carbon dioxide flue gas, and the carbon dioxide concentration in the flue gas is greater than 80%.
  • the first fan 151 when the carbon dioxide concentration monitored by the gas analyzer 115 is greater than the threshold value, the first fan 151 gradually increases the speed until it stays at the speed when the carbon dioxide concentration drops to the threshold value, and the pressure value monitored by the pressure sensor 114 is always within the preset range value during the process; in the above process, if the pressure value monitored by the pressure sensor 114 is greater than the upper limit of the preset range value but the carbon dioxide concentration has not dropped to the threshold value during the process of gradually increasing the speed of the first fan 151, the second fan 161 begins to gradually reduce the speed, while the first fan 151 keeps the speed unchanged, until the first fan 151 and the second fan 161 respectively stay at the speed when the carbon dioxide concentration drops to the threshold value and the pressure value drops to the preset range value; in the above process, if the second fan 161 is in the process of gradually reducing the speed, the carbon dioxide concentration still does not drop to the threshold value when the pressure value is less than the lower limit of the preset range value, the first fan 151 continues to gradually increase the

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Abstract

La présente divulgation concerne un procédé et un système à base de clinker de ciment calciné pour obtenir un gaz de combustion à haute concentration de dioxyde de carbone. Le système comprend : un four rotatif, pourvu d'une chambre de fumée et d'un couvercle de tête de four, le four rotatif entourant un appareil à induction électromagnétique le long de la direction de la longueur, et un capteur de pression et un analyseur de gaz étant disposés dans le couvercle de tête de four; un appareil de refroidissement à air, conçu pour refroidir, à l'aide de l'air, un clinker produit par chauffage et calcination d'une matière première dans le four rotatif au moyen de l'appareil à induction électromagnétique; un premier appareil d'échange de chaleur, conçu pour effectuer un échange de chaleur entre la matière première et un gaz de combustion produit par calcination de la matière première dans le four rotatif; un second appareil d'échange de chaleur, conçu pour effectuer un échange de chaleur entre la matière première et l'air après l'échange de chaleur; un premier ventilateur étant monté dans une conduite de gaz de combustion et conçu pour évacuer le gaz de combustion après l'échange de chaleur; un second ventilateur étant monté dans une conduite d'air et conçu pour évacuer l'air après un échange de chaleur secondaire; et un appareil de commande, conçu pour réguler les vitesses de rotation du premier ventilateur et du second ventilateur, de telle sorte que la concentration de dioxyde de carbone est réduite à un seuil et que la valeur de pression est réduite à une plage prédéfinie. Le système selon la présente divulgation peut obtenir un gaz de combustion à haute concentration de dioxyde de carbone.
PCT/CN2024/082048 2023-09-15 2024-03-15 Procédé et système à base de clinker de ciment calciné pour obtenir un gaz de combustion à haute concentration de dioxyde de carbone Pending WO2025055293A1 (fr)

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CN202311194724.X 2023-09-15
CN202311194724.XA CN117213227B (zh) 2023-09-15 2023-09-15 基于煅烧水泥熟料获得高浓度二氧化碳烟气的方法和系统

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WO2025055293A1 true WO2025055293A1 (fr) 2025-03-20

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