CN210855854U - Can realize CO2Zero-emission cement kiln system - Google Patents
Can realize CO2Zero-emission cement kiln system Download PDFInfo
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- CN210855854U CN210855854U CN201921297632.3U CN201921297632U CN210855854U CN 210855854 U CN210855854 U CN 210855854U CN 201921297632 U CN201921297632 U CN 201921297632U CN 210855854 U CN210855854 U CN 210855854U
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- 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
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Abstract
The utility model relates to a can realize CO2The zero-emission cement kiln system comprises a cyclone preheater, a decomposing furnace, a smoke chamber, a rotary kiln, a cooler, a heat exchanger, a dust collector, a chimney and a smoke purification device; the cooler is provided with a kiln door cover, a tertiary air pipe and a residual air pipeline; one end of each tertiary air pipe is connected with a cooler; the tertiary air pipe is divided into two paths through a switching part: one path is that the other end of the tertiary air pipe is connected with a decomposing furnace; the other path is that the other end of the tertiary air pipe is connected with a heat exchanger, and the heat exchanger is connected with a decomposing furnace through a pipeline; the air outlet of the cyclone preheater is connected with a dust collector through a pipeline, and the dust collector is connected with a flue gas purification device. The system of the utility model uses waterThe kiln head gas and the kiln tail gas released by the mud kiln capture all CO by using a flue gas purification carbon dioxide capture purification technology2Then released into the atmosphere, thereby realizing the CO in the cement kiln2And (4) zero emission.
Description
Technical Field
The utility model belongs to the technical field of cement manufacture equipment, especially, relate to a can realize CO2Zero-emission cement kiln system.
Background
In recent years, climate change and greenhouse gas emission have increasingly important influences on the development process of countries around the world. China, as the developing country with the best global economic growth and the largest manufacturing industry scale, is listed as the world with the largest carbon dioxide emission, and becomes the focus of global greenhouse gas emission reduction. 2014 Chinese CO2The emission is 94 hundred million tons, which accounts for 26 percent of the world, and the national government has a strict acceptance of CO for about 2030 years2Emissions peak. Carbon emissions from the cement industry account for about 20% of the carbon emissions from the industrial process, and certainly become a weight for emission reduction. In 2014, the total carbon dioxide recovery amount in China is 1040 ten thousand tons, and accounts for 0.1 percent of the total emission amount. The European carbon dioxide emission price is increased by 2 times to 20EUR/t within the last 1 yearCO2(ii) a Passing the law for CO in 2018 U.S2Permanent sealing and subsiding of $ 50, oil displacement and subsiding of $ 35, and utilization of subsidy of $ 15, European and American government policies describe CO in the future2Is used as a resource if the CO in the waste gas is treated2The CO is collected and purified, and can be widely used in the fields of metallurgy, steel, petrifaction, electronics, food, medical treatment and the like, so that the CO is generated2Is a valuable carbon and oxygen resource or is called carbon ore.
CO produced during cement production2CO per clinker emission from decomposition of carbonates and combustion of fuels2About 0.7 to about 0.9t/tClinkerCO per cement emission2About 0.5 to about 0.7t/tCementIn 2018, the world cement capacity reaches 57 hundred million tons, the Chinese cement industry accounts for half of the global capacity, and a large amount of CO is released to the atmosphere every year2. Although carbon emission reduction faces urgent situation requirements at home and abroad, the substantive technology and application of the cement industry are few, and the system solves the problem of CO in the cement kiln2Less process is discharged. The traditional energy-saving emission reduction technology, the fuel replacing technology and the new material technology for reducing the clinker consumption have few carbon emission reduction proportion which is about 10 to 20 percent, and can not meet the requirements of domestic and foreign ecological development. Therefore, a system was developed to address carbon emissions or CO2The zero emission technology is of great significance.
Carbon capture, utilization and sequestration, i.e. CCUS refers to the CO emitted from the utilization of fossil energy2The technology for capture, long-term storage and utilization, particularly CCU, is considered as the only technology capable of greatly reducing CO in fossil energy (especially coal)2The ultimate technology of emission is the hot spot of current research and application. The CCU is end treatment, or the problem of carbon emission reduction needs to be treated and researched from the source, and meanwhile, the method and cost for carbon capture and utilization and CO in the flue gas2Is directly related to the concentration of (c). For CO concentrations below 35%2Generally, a solvent absorption method is adopted for carbon capture, the operation cost is approximately the same within the concentration range, but the investment is reduced along with the increase of the concentration, and the reduction range is not large; CO 22When the concentration is higher and reaches 40% -75%, carbon capture can be carried out by adopting a pressure swing adsorption method; over 75% can be directly subjected to adsorption rectification. Over 40% CO2The operation cost and investment of the concentration gas source carbon capture can be obviously reduced, and the operation cost and the investment cost of the concentration gas source above 75 percent are reduced by nearly half.
Therefore, based on the problems, it is of great practical significance to provide a cement kiln system capable of realizing zero emission of carbon dioxide systematically.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, the utility model provides a can realize CO2The cement kiln system with zero emission comprises a cyclone preheater and a decomposition deviceThe device comprises a furnace, a smoke chamber, a rotary kiln, a kiln door cover, a cooler, a heat exchanger, a dust collector, a chimney and a smoke purification device;
the cyclone preheater is connected with the decomposing furnace through a pipeline, the decomposing furnace is connected with a smoke chamber, the smoke chamber is connected with the rotary kiln, and the rotary kiln is connected with a cooler;
the cooler is provided with a kiln door cover, a tertiary air pipe and a residual air pipeline; one ends of the kiln door cover, the tertiary air pipe and the residual air pipeline are all connected with a cooler; the other end of the kiln door cover is connected with the rotary kiln; the tertiary air pipe is divided into two paths through a switching part: one path is that the other end of the tertiary air pipe is connected with a decomposing furnace; the other path is that the other end of the tertiary air pipe is connected with a heat exchanger, and the heat exchanger is connected with a decomposing furnace through a pipeline; the other end of the surplus air pipeline is connected with a dust collector which is connected with a chimney;
an air outlet of the cyclone preheater is connected with a dust collector through a pipeline, and the dust collector is connected with a flue gas purification device; the flue gas purification device comprises: the device comprises a desulfurization and denitrification device, a carbon dioxide absorption tower, a carbon dioxide desorption tower, a compression adsorption rectifying tower, a carbon dioxide storage device and a chimney, wherein the desulfurization and denitrification device is connected with the carbon dioxide absorption tower, the carbon dioxide absorption tower is connected with the carbon dioxide desorption tower, the carbon dioxide desorption tower is connected with the compression adsorption rectifying tower, and the compression adsorption rectifying tower is connected with the carbon dioxide storage device; the carbon dioxide absorption tower is connected with a chimney.
According to the utility model discloses an embodiment, cement kiln system still includes at least one of power generation facility, grinding device.
According to the embodiment of the utility model, one end of the residual air pipeline is connected with the cooling machine, the other end of the residual air pipeline is connected with the power generation device, the power generation device is connected with the dust collector, and the dust collector is connected with the chimney;
an air outlet of the cyclone preheater is connected with a power generation device through a pipeline, the power generation device is connected with a grinding device, the grinding device is connected with a dust collector, and the dust collector is connected with a flue gas purification device.
According to the embodiment of the utility model, one end of the residual air pipeline is connected with the cooler, the other end of the residual air pipeline is connected with the power generation device, the power generation device is connected with the grinding device, the grinding device is connected with the dust collector, and the dust collector is connected with the chimney;
the air outlet of the cyclone preheater is connected with a power generation device through a pipeline, the power generation device is connected with a dust collector, and the dust collector is connected with a flue gas purification device.
According to an embodiment of the invention, the switching member is selected from a valve.
According to an embodiment of the invention, the valve comprises a first valve, a second valve, a third valve;
a first valve is arranged on a tertiary air pipe connecting the cooler and the heat exchanger, and a second valve is arranged on a pipeline connecting the heat exchanger and the decomposing furnace; and a third valve is arranged on a tertiary air pipe connecting the cooler and the decomposing furnace.
According to the embodiment of the utility model, the cement kiln system also comprises a burner, and the burners are arranged at the outlet of the rotary kiln and on the decomposing furnace;
the number of the burners arranged at the outlet of the rotary kiln is 1;
the number of the burners provided on the decomposing furnace is 1 or more.
According to the utility model discloses an embodiment, cyclone preheater's air intake passes through the pipe connection dore furnace, and cyclone preheater's discharge gate passes through the pipe connection smoke chamber.
According to the embodiment of the utility model, the air inlet of the last cyclone separator of the cyclone preheater is connected with the decomposing furnace through a pipeline;
the discharge port of the last but one stage cyclone separator of the cyclone preheater is connected with the decomposing furnace through a pipeline;
the feed inlet of the last-but-one cyclone separator of the cyclone preheater is connected with the decomposing furnace through a pipeline; the discharge port of the last-but-one cyclone separator of the cyclone preheater is connected with the smoke chamber through a pipeline.
According to the embodiment of the utility model, the conveying pipeline connecting the discharge port of the penultimate cyclone separator of the cyclone preheater and the decomposing furnace comprises a conveying main road and conveying branch roads, and the number of the conveying branch roads is more than 2; all the conveying branches are connected in parallel, and a distributing valve is arranged at the joint of the conveying main road and the conveying branch; the material distributing valve regulates the amount of materials entering each conveying branch from the conveying main road; thereby realizing the multi-point feeding of the decomposing furnace and the adjustment of the temperature range.
The utility model also provides a use above-mentioned CO that can realize2A method for preparing cement clinker in a zero emission cement kiln system, said method comprising the steps of:
adding the raw materials into a cyclone preheater, and exchanging heat between the raw materials and the flue gas in the cyclone preheater;
the raw materials preheated by the cyclone preheater enter the decomposing furnace through one or more points;
the hot raw materials decomposed by the decomposing furnace leave the decomposing furnace and enter the rotary kiln through the smoke chamber, the hot raw materials are calcined in the rotary kiln to form clinker, the clinker enters a cooling machine through a kiln door cover at the outlet of the rotary kiln, and the clinker is cooled by air blown by a fan to obtain cement clinker;
kiln gas formed in the rotary kiln enters a decomposing furnace; kiln gas formed in the rotary kiln and flue gas formed in the decomposing furnace are subjected to gas-solid heat exchange of the cyclone preheater and then are discharged from an outlet of the uppermost stage cyclone separator of the cyclone preheater;
the flue gas discharged from the outlet of the cyclone preheater is dedusted by a dust collector and then enters a flue gas purification device, the flue gas is desulfurized and denitrated by a desulfurization and denitrification device to remove sulfur-containing compounds and nitrogen-containing compounds in the flue gas, and then enters a carbon dioxide absorption tower, and absorption liquid in the carbon dioxide absorption tower absorbs CO2Free of CO2The purified gas is discharged into the atmosphere through a chimney; then the absorption liquid enters a carbon dioxide desorption tower to release CO2Then CO2The CO enters a compression adsorption rectifying tower for compression and purification, and the compressed and purified CO2Entering a carbon dioxide storage device;
the air cools the high-temperature clinker through a cooler, and the air after heat exchange is divided into the following three paths:
the first path of high-temperature air as secondary air enters the rotary kiln through a kiln door cover for fuel combustion; the second path of air is divided into two paths by the switching component, and any one of the following paths is selected by adjusting the switching component: one path is that tertiary air enters a heat exchanger through a tertiary air pipe, oxygen enters the heat exchanger, the tertiary air and the oxygen perform heat exchange through the heat exchanger, the oxygen out of the heat exchanger enters a decomposing furnace, and the tertiary air out of the heat exchanger enters a waste heat utilization or treatment system; the other path is that the tertiary air directly enters the decomposing furnace through a tertiary air pipe, and the tertiary air in the tertiary air pipe directly enters the decomposing furnace; and the third path of air enters a dust collector through an after-air pipeline for dust removal, and the gas after dust removal is discharged into the atmosphere through a chimney.
According to the utility model discloses an embodiment, the hot raw material that the dore furnace decomposition was accomplished leaves the dore furnace and gets into cyclone preheater's first last cyclone, gets into the rotary kiln through the smoke chamber after the gas-solid separation.
According to the embodiment of the utility model, the air cools the high-temperature clinker through the cooler, the air with higher temperature after heat exchange enters the power generation device through the residual air pipeline for power generation, the flue gas discharged by the power generation device enters the dust collector for dust removal, and the gas after dust removal is discharged into the atmosphere through the chimney;
the flue gas discharged from the outlet of the cyclone preheater enters a power generation device for power generation, the flue gas discharged from the power generation device enters a grinding device for grinding, the flue gas discharged from the grinding device enters a dust collector for dust removal, and the flue gas discharged from the dust collector enters a flue gas purification device.
According to the embodiment of the utility model, the air is cooled by the cooler to the high-temperature clinker, the air with higher temperature after heat exchange enters the power generation device through the residual air pipeline for power generation, the flue gas discharged by the power generation device enters the grinding device for grinding, the flue gas discharged by the grinding device enters the dust collector for dust removal, and the gas discharged by the dust collector is discharged into the atmosphere through the chimney;
the flue gas discharged from the outlet of the cyclone preheater enters a power generation device for power generation, the flue gas discharged from the power generation device enters a dust collector for dust removal, and the gas discharged from the dust collector enters a flue gas purification device.
According to the utility model discloses an embodiment, the tertiary air divide into two the tunnel through the valve, selects following arbitrary all the way through adjusting the valve: one way is that the third valve is closed, the first valve and the second valve are opened, the tertiary air enters the heat exchanger through the tertiary air pipe, the oxygen enters the heat exchanger, the tertiary air and the oxygen perform heat exchange through the heat exchanger, the oxygen out of the heat exchanger enters the decomposing furnace, and the tertiary air out of the heat exchanger enters the waste heat utilization or treatment system; the other path is that a third valve is opened, the first valve and the second valve are closed, the tertiary air directly enters the decomposing furnace through a tertiary air pipe, and the tertiary air in the tertiary air pipe directly enters the decomposing furnace.
Advantageous effects
The utility model discloses a cement kiln system becomes the carbon ore with the carbon dioxide that causes adverse effect to the ecological environment that discharges among the cement preparation process, has reduced the cost of carbon capture carbon enrichment, and it is showing to promote the meaning.
The utility model discloses the rotary kiln and the cooler of system do not relate to oxygen boosting or total oxygen burning, and the comb board of cooler, fan, the combustor of being connected with the rotary kiln, the firebrick in the rotary kiln all do not need to be special design, do not have the risk that the oxygen boosting burning needs redesign to reform transform equipment and material, easy to carry out.
The system of the utility model utilizes the flue gas purification carbon dioxide capture and purification technology to capture all CO with the kiln head gas and the kiln tail gas released by the cement kiln2Then released into the atmosphere, thereby realizing the CO in the cement kiln2Zero emission; simultaneously improves CO in the flue gas2Concentration, reduces the capture cost and improves the technical economy.
Drawings
FIG. 1 shows that the present invention provides a device capable of realizing CO in embodiment 12A zero-emission cement kiln system diagram.
FIG. 2 shows that the present invention provided in embodiment 2 can realize CO2A zero-emission cement kiln system diagram.
Fig. 3 is a schematic view of the flue gas purification device of the present invention.
The system comprises a cyclone preheater 1, a material distributing valve 2, a decomposing furnace 3, a burner 4, a smoke chamber 5, a rotary kiln 6, a fan 7, a cooler 8, a kiln door cover 9, a tertiary air pipe 10, an after-air pipeline 11, a valve A12, a valve B13, a valve C14, a heat exchanger 15, an oxygen preparation device 16, a power generation device 17, a dust collector 18, a chimney 19, a grinding device 20, a smoke purification device 21, a desulfurization and denitrification device 22, a carbon dioxide absorption tower 23, a carbon dioxide analysis tower 24, a compression adsorption rectification tower 25 and a carbon dioxide storage device 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in FIG. 1, CO can be realized2The zero-emission cement kiln system comprises a cyclone preheater (1), a decomposing furnace (3), a smoke chamber (5), a rotary kiln (6), a cooler (8), a fan (7), a heat exchanger (15), a power generation device (17), a grinding device (20), a dust collector (18), a chimney (19) and a flue gas purification device (21); the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, an air inlet of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, and a discharge port of the cyclone preheater (1) is connected with the smoke chamber (5) through a pipeline; the air inlet of the last-but-one cyclone separator of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline; the discharge port of the second last cyclone separator of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, the feed port of the first last cyclone separator of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, and the discharge port of the first last cyclone separator of the cyclone preheater (1) is connected with the smoke chamber (5) through a pipeline; cyclone preheater (1) The conveying pipeline for connecting the discharge port of the penultimate cyclone separator with the decomposing furnace (3) comprises 2 conveying main paths and 2 conveying branch paths; the two conveying branches are connected in parallel, and a distributing valve (2) is arranged at the joint of the conveying main branch and the conveying branch; the material distributing valve (2) adjusts the material quantity entering each conveying branch from the conveying main path; thereby realizing multi-point feeding of the decomposing furnace (3). The decomposing furnace (3) is connected with a smoke chamber (5), the smoke chamber (5) is connected with a rotary kiln (6), and the rotary kiln (6) is connected with a cooler (8); 1 burner (4) is arranged at the outlet of the rotary kiln (6), and 4 burners (4) are arranged on the decomposing furnace (3). The fuel is respectively added into the rotary kiln (6) and the decomposing furnace (3) to provide heat required by clinker calcination, the proportion of the fuel entering the kiln head is 30-50%, and the proportion of the fuel entering the kiln tail is about 50-70%.
A fan (7) is arranged below the cooler (8); the cooler (8) is provided with a kiln door cover (9), a tertiary air pipe (10) and a residual air pipeline (11); one ends of the kiln door cover (9), the tertiary air pipe (10) and the residual air pipeline (11) are all connected with a cooler (8); the other end of the kiln door cover (9) is connected with the rotary kiln (6); a valve A (12) and a valve C (14) are arranged on the tertiary air pipe (10); a valve A (12) is arranged on the tertiary air pipe (10) between the cooler (8) and the heat exchanger (15), and a valve B (13) is arranged on the tertiary air pipe (10) between the heat exchanger (15) and the decomposing furnace (3); a valve C (14) is arranged on a tertiary air pipe (10) which is directly connected with the cooler (8) and the decomposing furnace (3). The oxygen preparation device (16) is connected with the heat exchanger (15). The tertiary air pipe (10) is divided into two paths through a valve: one path is that the other end of the tertiary air pipe (10) is connected with the decomposing furnace (3); the other path is that the other end of the tertiary air pipe (10) is connected with a heat exchanger (15), and the heat exchanger (15) is connected with the decomposing furnace (3) through a pipeline; the other end of the residual air pipeline (11) is connected with a power generation device (17), the power generation device (17) is connected with a dust collector (18), and the dust collector (18) is connected with a chimney (19).
An air outlet of the cyclone preheater (1) is connected with a power generation device (17) through a pipeline, the power generation device (17) is connected with a grinding device (20), the grinding device (20) is connected with a dust collector (18), and the dust collector (18) is connected with a flue gas purification device (21); the flue gas purification device (21) comprises: the device comprises a desulfurization and denitrification device (22), a carbon dioxide absorption tower (23), a carbon dioxide desorption tower (24), a compression adsorption rectifying tower (25), a carbon dioxide storage device (26) and a chimney (19), wherein the desulfurization and denitrification device (22) is connected with the carbon dioxide absorption tower (23), the carbon dioxide absorption tower (23) is connected with the carbon dioxide desorption tower (24), the carbon dioxide desorption tower (24) is connected with the compression adsorption rectifying tower (25), and the compression adsorption rectifying tower (25) is connected with the carbon dioxide storage device (26); the carbon dioxide absorption tower (23) is connected with a chimney (19).
When the cement kiln system is used, raw materials are added into the cyclone preheater (1), and the heat exchange between the raw materials and flue gas is carried out in the cyclone preheater (1); the raw meal preheated by the cyclone preheater (1) enters the decomposing furnace (3) through one or more points; the hot raw materials decomposed by the decomposing furnace (3) leave the decomposing furnace (3) and enter a first-stage cyclone separator at the reciprocal of the cyclone preheater (1), the hot raw materials enter a rotary kiln (6) through a smoke chamber (5) after gas-solid separation, clinker is calcined in the rotary kiln (6) and is at the temperature of about 1450 ℃, the clinker enters a cooling machine (8) from the outlet of the rotary kiln (6), and air blown by a fan (7) cools the clinker to 65-150 ℃ to obtain the cement clinker.
Kiln gas formed in the rotary kiln (6) enters the decomposing furnace (3); kiln gas formed in the rotary kiln (6) and flue gas formed in the decomposing furnace (3) are subjected to gas-solid heat exchange of the cyclone preheater (1) and then discharged from an outlet of a first-stage cyclone separator at the top of the cyclone preheater (1); flue gas discharged from an outlet of a cyclone preheater (1) enters a power generation device (17) for power generation, the flue gas discharged from the power generation device (17) enters a grinding device (20) for grinding, the flue gas discharged from the grinding device (20) enters a dust collector (18) for dust removal, the flue gas discharged from the dust collector (18) enters a flue gas purification device (21), the flue gas is subjected to desulfurization and denitrification by a desulfurization and denitrification device (22) to remove sulfur-containing compounds and nitrogen-containing compounds in the flue gas and then enters a carbon dioxide absorption tower (23), and absorption liquid in the carbon dioxide absorption tower (23) absorbs CO2Free of CO2The purified gas is discharged into the atmosphere through a chimney (19); then the absorption liquid enters a carbon dioxide desorption tower (24) to release CO2，CO2The CO enters a compression adsorption rectifying tower (25) for compression and purification, and the compressed and purified CO2Entering a carbon dioxide storage device (26);
the air cools the high-temperature clinker through a cooler (8), and the air after heat exchange is divided into the following three paths: the first path of high-temperature air as secondary air enters the rotary kiln (6) through a kiln door cover (9) for fuel combustion; the second path of air selects any one of the following paths through adjusting a valve: one way is that the valve C (14) is closed, the valve A (12) and the valve B (13) are opened, the tertiary air enters the heat exchanger (15) through the tertiary air pipe (10), the oxygen prepared by the oxygen preparation device (16) enters the heat exchanger (15), the tertiary air and the oxygen carry out heat exchange through the heat exchanger (15), the temperature of the heated oxygen can be raised to be above 300 ℃, the oxygen out of the heat exchanger (15) enters the decomposing furnace (3) to provide the oxygen required by fuel combustion in the decomposing furnace (3), and the tertiary air out of the heat exchanger (15) enters a waste heat utilization or treatment system; the other path is that a valve C (14) is opened, a valve A (12) and a valve B (13) are closed, tertiary air directly enters the decomposing furnace (3) through a tertiary air pipe (10) without passing through a heat exchanger, and the tertiary air in the tertiary air pipe (10) directly enters the decomposing furnace (3); and the third path of air with higher temperature enters a power generation device (17) through an after-air pipeline (11) for power generation, flue gas discharged by the power generation device (17) enters a dust collector (18) for dust removal, and the gas after dust removal is discharged into the atmosphere through a chimney (19).
Example 2
As shown in FIG. 2, CO can be realized2The zero-emission cement kiln system comprises a cyclone preheater (1), a decomposing furnace (3), a smoke chamber (5), a rotary kiln (6), a cooler (8), a fan (7), a heat exchanger (15), a power generation device (17), a grinding device (20), a dust collector (18), a chimney (19) and a flue gas purification device (21); the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, an air inlet of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, and a discharge port of the cyclone preheater (1) is connected with the smoke chamber (5) through a pipeline; the air inlet of the last-but-one cyclone separator of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline; the discharge port of the second last cyclone separator of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, the feed port of the first last cyclone separator of the cyclone preheater (1) is connected with the decomposing furnace (3) through a pipeline, and the discharge port of the first last cyclone separator of the cyclone preheater (1) is connected with the smoke chamber (5) through a pipeline; the conveying pipeline for connecting the discharge port of the penultimate cyclone separator of the cyclone preheater (1) and the decomposing furnace (3) comprises 2 conveying main paths and 2 conveying branch paths; two conveyingThe branch circuits are connected in parallel, and a distributing valve (2) is arranged at the joint of the conveying main circuit and the conveying branch circuit; the material distributing valve (2) adjusts the material quantity entering each conveying branch from the conveying main path; thereby realizing multi-point feeding of the decomposing furnace (3). The decomposing furnace (3) is connected with a smoke chamber (5), the smoke chamber (5) is connected with a rotary kiln (6), and the rotary kiln (6) is connected with a cooler (8); 1 burner (4) is arranged at the outlet of the rotary kiln (6), and 4 burners (4) are arranged on the decomposing furnace (3). The fuel is respectively added into the rotary kiln (6) and the decomposing furnace (3) to provide heat required by clinker calcination, the proportion of the fuel entering the kiln head is 30-50%, and the proportion of the fuel entering the kiln tail is about 50-70%.
A fan (7) is arranged below the cooler (8); the cooler (8) is provided with a kiln door cover (9), a tertiary air pipe (10) and a residual air pipeline (11); one ends of the kiln door cover (9), the tertiary air pipe (10) and the residual air pipeline (11) are all connected with a cooler (8); the other end of the kiln door cover (9) is connected with the rotary kiln (6); a valve A (12) and a valve C (14) are arranged on the tertiary air pipe (10); a valve A (12) is arranged on a tertiary air pipe (10) connecting the cooler (8) and the heat exchanger (15), and a valve B (13) is arranged on a pipeline connecting the heat exchanger (15) and the decomposing furnace (3); a tertiary air pipe (10) directly connecting the cooler (8) and the decomposing furnace (3) is provided with a valve C (14). The oxygen preparation device (16) is connected with the heat exchanger (15). The tertiary air pipe (10) is divided into two paths through a valve: one path is that the other end of the tertiary air pipe (10) is connected with the decomposing furnace (3); the other path is that the other end of the tertiary air pipe (10) is connected with a heat exchanger (15), and the heat exchanger (15) is connected with the decomposing furnace (3) through a pipeline; the other end of the residual air pipeline (11) is connected with a power generation device (17), the power generation device (17) is connected with a grinding device (20), the grinding device (20) is connected with a dust collector (18), and the dust collector (18) is connected with a chimney (19).
An air outlet of the cyclone preheater (1) is connected with a power generation device (17) through a pipeline, the power generation device (17) is connected with a dust collector (18), and the dust collector (18) is connected with a flue gas purification device (21); the flue gas purification device (21) comprises: the device comprises a desulfurization and denitrification device (22), a carbon dioxide absorption tower (23), a carbon dioxide desorption tower (24), a compression adsorption rectifying tower (25), a carbon dioxide storage device (26) and a chimney (19), wherein the desulfurization and denitrification device (22) is connected with the carbon dioxide absorption tower (23), the carbon dioxide absorption tower (23) is connected with the carbon dioxide desorption tower (24), the carbon dioxide desorption tower (24) is connected with the compression adsorption rectifying tower (25), and the compression adsorption rectifying tower (25) is connected with the carbon dioxide storage device (26); the carbon dioxide absorption tower (23) is connected with a chimney (19).
When the cement kiln system is used, raw materials are added into the cyclone preheater (1), and the heat exchange between the raw materials and flue gas is carried out in the cyclone preheater (1); the raw meal preheated by the cyclone preheater (1) enters the decomposing furnace (3) through one or more points; the hot raw materials decomposed by the decomposing furnace (3) leave the decomposing furnace (3) and enter a first-stage cyclone separator at the reciprocal of the cyclone preheater (1), the hot raw materials enter a rotary kiln (6) through a smoke chamber (5) after gas-solid separation, clinker is formed by calcining in the rotary kiln (6), the temperature of the clinker is about 1450 ℃, the clinker enters a cooling machine (8) from the outlet of the rotary kiln (6), and the clinker is cooled to 65-150 ℃ by air blown by a fan (7) to obtain the cement clinker.
Kiln gas formed in the rotary kiln (6) enters the decomposing furnace (3); kiln gas formed in the rotary kiln (6) and flue gas formed in the decomposing furnace (3) are subjected to gas-solid heat exchange of the cyclone preheater (1) and then discharged from an outlet of the uppermost stage cyclone separator of the cyclone preheater (1).
Flue gas discharged from an outlet of the cyclone preheater (1) enters a power generation device (17) for power generation, the flue gas discharged from the power generation device (17) enters a dust collector (18) for dust removal, the flue gas discharged from the dust collector (18) enters a flue gas purification device (21), the flue gas is subjected to desulfurization and denitrification by a desulfurization and denitrification device (22) to remove sulfur-containing compounds and nitrogen-containing compounds in the flue gas, and then enters a carbon dioxide absorption tower (23), and absorption liquid in the carbon dioxide absorption tower (23) absorbs CO2Free of CO2The purified gas is discharged into the atmosphere through a chimney (19); then the absorption liquid enters a carbon dioxide desorption tower (24) to release CO2，CO2The CO enters a compression adsorption rectifying tower (25) for compression and purification, and the compressed and purified CO2Into a carbon dioxide storage unit (26).
The air cools the high-temperature clinker through a cooler (8), and the air after heat exchange is divided into the following three paths: the first path of high-temperature air as secondary air enters the rotary kiln (6) through a kiln door cover (9) for fuel combustion; the second path of air is divided into two paths by the switching component, and any one of the following paths is selected by adjusting the valve: one way is that the valve C (14) is closed, the valve A (12) and the valve B (13) are opened, the tertiary air enters the heat exchanger (15) through the tertiary air pipe (10), the oxygen prepared by the oxygen preparation device (16) enters the heat exchanger (15), the tertiary air and the oxygen carry out heat exchange through the heat exchanger (15), the temperature of the heated oxygen can be raised to be more than 300 ℃, the oxygen out of the heat exchanger (15) enters the decomposing furnace (3), and the tertiary air out of the heat exchanger (15) enters the waste heat utilization or treatment system; the other path is that a valve C (14) is opened, a valve A (12) and a valve B (13) are closed, tertiary air directly enters the decomposing furnace (3) through a tertiary air pipe (10) without passing through a heat exchanger, and the tertiary air in the tertiary air pipe (10) directly enters the decomposing furnace (3); and the third path of air with higher temperature enters a power generation device (17) through an exhaust air pipeline (11) for power generation, the flue gas discharged by the power generation device (17) enters a grinding device (20) for grinding, the flue gas discharged by the grinding device (20) enters a dust collector (18) for dust removal, and the gas discharged by the dust collector (18) is discharged into the atmosphere through a chimney (19).
The above is only the preferred embodiment of the present invention, and the present invention is not limited to any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention, for example, the cyclone preheater is replaced by a third to sixth grade preheater or a double-row preheater, the cooler is a third generation or a fourth generation cooler, the gas provided by the oxygen generator is full oxygen or oxygen enriched, and the full oxygen or oxygen enriched combustion in the decomposing furnace should be included in the protection scope of the present invention.
Claims (10)
1. Can realize CO2The zero-emission cement kiln system is characterized by comprising a cyclone preheater, a decomposing furnace, a smoke chamber, a rotary kiln, a kiln door cover, a cooler, a heat exchanger, a dust collector, a chimney and a smoke purification device;
the cyclone preheater is connected with the decomposing furnace through a pipeline, the decomposing furnace is connected with a smoke chamber, the smoke chamber is connected with the rotary kiln, and the rotary kiln is connected with a cooler through a kiln door cover;
the cooler is provided with a kiln door cover, a tertiary air pipe and a residual air pipeline; one ends of the kiln door cover, the tertiary air pipe and the residual air pipeline are all connected with a cooler; the other end of the kiln door cover is connected with the rotary kiln, and the kiln door cover is used for providing secondary air for the rotary kiln; the tertiary air pipe is divided into two paths through a switching part: one path is that the other end of the tertiary air pipe is connected with a decomposing furnace; the other path is that the other end of the tertiary air pipe is connected with a heat exchanger, and the heat exchanger is connected with a decomposing furnace through a pipeline; the other end of the surplus air pipeline is connected with a dust collector which is connected with a chimney;
an air outlet of the cyclone preheater is connected with a dust collector through a pipeline, and the dust collector is connected with a flue gas purification device; the flue gas purification device comprises: the device comprises a desulfurization and denitrification device, a carbon dioxide absorption tower, a carbon dioxide desorption tower, a compression adsorption rectifying tower, a carbon dioxide storage device and a chimney, wherein the desulfurization and denitrification device is connected with the carbon dioxide absorption tower, the carbon dioxide absorption tower is connected with the carbon dioxide desorption tower, the carbon dioxide desorption tower is connected with the compression adsorption rectifying tower, and the compression adsorption rectifying tower is connected with the carbon dioxide storage device; the carbon dioxide absorption tower is connected with a chimney.
2. The achievable CO of claim 12The zero-emission cement kiln system is characterized by further comprising at least one of a power generation device and a grinding device.
3. The achievable CO of claim 22The zero-emission cement kiln system is characterized in that,
one end of the residual air pipeline is connected with the cooler, the other end of the residual air pipeline is connected with the power generation device, the power generation device is connected with the dust collector, and the dust collector is connected with the chimney;
an air outlet of the cyclone preheater is connected with a power generation device through a pipeline, the power generation device is connected with a grinding device, the grinding device is connected with a dust collector, and the dust collector is connected with a flue gas purification device.
4. The achievable CO of claim 22The zero-emission cement kiln system is characterized in that,
one end of the residual air pipeline is connected with the cooler, the other end of the residual air pipeline is connected with the power generation device, the power generation device is connected with the grinding device, the grinding device is connected with the dust collector, and the dust collector is connected with the chimney;
the air outlet of the cyclone preheater is connected with a power generation device through a pipeline, the power generation device is connected with a dust collector, and the dust collector is connected with a flue gas purification device.
5. The achievable CO of claim 12A zero emission cement kiln system, characterized in that the switching means are selected from valves.
6. The achievable CO of claim 52The zero-emission cement kiln system is characterized in that the valve comprises a first valve, a second valve and a third valve;
a first valve is arranged on a tertiary air pipe connecting the cooler and the heat exchanger, and a second valve is arranged on a pipeline connecting the heat exchanger and the decomposing furnace; and a third valve is arranged on a tertiary air pipe connecting the cooler and the decomposing furnace.
7. The achievable CO of claim 12The zero-emission cement kiln system is characterized by further comprising a combustor, wherein the combustor is arranged at the outlet of the rotary kiln and on the decomposing furnace;
the number of the burners arranged at the outlet of the rotary kiln is 1;
the number of the burners provided on the decomposing furnace is 1 or more.
8. The achievable CO of claim 12The zero-emission cement kiln system is characterized in that,
the air inlet of the cyclone preheater is connected with the decomposing furnace through a pipeline, and the discharge port of the cyclone preheater is connected with the smoke chamber through a pipeline.
9. The achievable CO of claim 82The zero-emission cement kiln system is characterized in that,
the air inlet of the last-but-one cyclone separator of the cyclone preheater is connected with the decomposing furnace through a pipeline;
the discharge port of the last but one stage cyclone separator of the cyclone preheater is connected with the decomposing furnace through a pipeline;
the feed inlet of the last-but-one cyclone separator of the cyclone preheater is connected with the decomposing furnace through a pipeline; the discharge port of the last-but-one cyclone separator of the cyclone preheater is connected with the smoke chamber through a pipeline.
10. The achievable CO of claim 82The zero-emission cement kiln system is characterized in that a conveying pipeline for connecting a discharge port of a penultimate cyclone separator of a cyclone preheater with a decomposing furnace comprises conveying main roads and conveying branches, and the number of the conveying branches is more than 2; all the conveying branches are connected in parallel, and a distributing valve is arranged at the joint of the conveying main road and the conveying branch; the material distributing valve regulates the amount of materials entering each conveying branch from the conveying main road; thereby realizing the multi-point feeding of the decomposing furnace and the adjustment of the temperature range.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321183A (en) * | 2020-11-12 | 2021-02-05 | 天津水泥工业设计研究院有限公司 | Cement kiln system for realizing zero emission of carbon dioxide and cement clinker preparation method |
| WO2023056495A1 (en) * | 2021-10-04 | 2023-04-13 | Scheuch Management Holding GmbH | Process and plant for producing cement clinker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321183A (en) * | 2020-11-12 | 2021-02-05 | 天津水泥工业设计研究院有限公司 | Cement kiln system for realizing zero emission of carbon dioxide and cement clinker preparation method |
| WO2023056495A1 (en) * | 2021-10-04 | 2023-04-13 | Scheuch Management Holding GmbH | Process and plant for producing cement clinker |
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