CN115654914A - Cement production method by utilizing alternative fuel oxy-fuel combustion coupled with carbon capture - Google Patents
Cement production method by utilizing alternative fuel oxy-fuel combustion coupled with carbon capture Download PDFInfo
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Abstract
The invention belongs to the technical field of carbon emission reduction in the cement industry, and particularly relates to a cement production method by coupling oxy-fuel combustion with carbon capture by using alternative fuels, wherein a smoke chamber is connected with a bypass air release system, and a two-stage cooler is connected with a raw material mill system; clean waste gas which is discharged from the preheater and passes through a waste heat power generation and treatment system enters a cooling and condensing device, the cooling and condensing device is connected with a reheating device, the reheating device is connected with a carbon capture and purification device through a fan E, the reheating device is connected with a first section of a two-section cooler, a kiln head burner and a kiln tail burner through a fan F, and a fan A and a fan C of a bypass air discharge system are connected; the oxygen generating system is respectively connected with the first section of the second section cooler, the kiln head burner, the kiln door cover or the tertiary air pipe. The invention provides a cement production method by coupling oxy-fuel combustion with carbon capture by using alternative fuels.
Description
Technical Field
The invention belongs to the technical field of carbon emission reduction in the cement industry, and particularly relates to a cement production method by coupling oxy-fuel combustion with carbon capture by using alternative fuels.
Background
The prior art is as follows:
the carbon emission reduction aspect mainly comprises industrial structure adjustment, energy conservation and consumption reduction, raw material optimization and fuel substitution; the carbon neutralization aspects are mainly cooperative disposal, waste utilization, peak shifting production, carbon trading mechanism, CCUS (carbon capture, transportation, utilization, storage), and the like.
At present, a novel dry production process is generally adopted in a cement production process, the fuels comprise coal, oil, natural gas and the like, and the utilization of alternative fuels is an important measure for carbon emission reduction. Heat substitution rate of alternative fuels applied to cement kiln in developed countries of the world
TSR (thermolSubstistionRate) generally reaches 30% -90%, and the average of all countries in the world is 7.6%. At present, the cement industry in China is still in a primary stage with low efficiency in the aspect of alternative fuel application technology, the heat substitution rate is low, the smoke emission is large, and CO is generated 2 The discharge is high.
Research on carbon emission reduction technology mainly faces to industries such as electric power, coal, steel and the like at home and abroad, and relatively few reports on carbon emission reduction technology related to cement industry exist. Carbon available in cement industry at presentThe emission reduction technology is to capture CO before combustion 2 And capturing CO after combustion 2 。
However, the inventors of the present application have found that the above prior art has at least the following technical problems:
after a large amount of alternative fuel is put into a cement kiln system, because the particle size of the alternative fuel is large, the heat value is low, the moisture is high, incomplete combustion is easy to occur in a decomposing furnace, the burnout rate is low, and a large amount of CO is easy to generate, the common solution is that a high-temperature fan is increased to draw air in the operation process, the excess air coefficient is increased, the furnace volume of the decomposing furnace is increased, and the air volume of a preheating pre-decomposing system is overhigh and can reach 1.7-1.8Nm 3 Cl, high temperature of the outlet of the preheater system, large air volume, 80-100kcal/kg of heat consumption of the system higher than that of the cement produced by normal fossil fuel combustion, and CO 2 The discharge amount is large.
CO capture before combustion 2 A significant disadvantage of (2) is that only CO produced by the combustion of the fuel can be separated off 2 And about 60% of calcium carbonate generated by decomposition is not treated along with the emission of flue gas, so that the technology has low feasibility in carbon emission reduction in the cement industry. Air is normally adopted for combustion supporting in the cement industry to cause CO 2 Low concentration (20-30%), high volume flow rate, and high dust and N content 2 After the alternative fuel is utilized, various pollutant emissions may occur, such as chlorine, sulfur, NOx, TOC, VOCs and the like, the subsequent environmental protection equipment for desulfurization, denitrification, VOCs removal and the like has large selection, high investment and poor economy, and the CO is captured after combustion 2 The application difficulty is high, the system is complex, the equipment investment is high, and the operation cost is high.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the cement production method utilizing the alternative fuel oxy-fuel combustion coupled carbon capture is provided, the heat replacement rate of the cement kiln using the alternative fuel oxy-fuel combustion coupled carbon capture technology is up to more than 90 percent, and the dry-based CO of the smoke at the outlet of the preheater is enabled to be 2 The concentration is more than or equal to 80 percent, the CO concentration is 4000-9000ppm, the pure oxygen consumption and the oxygen production cost are reduced, the air quantity of the whole kiln tail system is small, the heat consumption of a cement production system is low, and the environment-friendly facility for subsequent waste gas treatment can be greatly reducedSpare investment and CO 2 Capture purification and operating costs.
Disclosure of Invention
The application aims to solve the technical problems in the prior art and provide a cement production method by using alternative fuel oxy-fuel combustion coupled carbon capture, the alternative fuel oxy-fuel combustion coupled carbon capture technology is used, the heat substitution rate of the alternative fuel applied to a cement kiln can reach more than 90 percent, and the flue gas at the outlet of a preheater is dry-based CO 2 The concentration is more than or equal to 80 percent, the CO concentration is 4000-9000ppm, the pure oxygen consumption and the oxygen production cost are reduced, the air quantity of the whole kiln tail system is small, the heat consumption of a cement production system is low, and the investment of subsequent waste gas treatment environment-friendly equipment and the CO can be greatly reduced 2 Capture purification and operating costs.
The technical scheme adopted by the embodiment of the application to solve the technical problems in the prior art is as follows:
the cement process system for capturing the carbon by using the coupling of the oxy-fuel combustion of the alternative fuel comprises a preheater, a decomposing furnace, a smoke chamber, a rotary kiln and a secondary cooler which are sequentially connected, wherein the smoke chamber is connected with a bypass air release system, and the secondary cooler is connected with a raw material mill system;
clean waste gas which is discharged from the preheater and passes through a waste heat power generation and treatment system enters a cooling and condensing device, the cooling and condensing device is connected with a reheating device, the reheating device is connected with a carbon capture and purification device through a fan E, the reheating device is connected with a first section of a two-section cooler, a kiln head burner and a kiln tail burner through a fan F, and a fan A and a fan C of a bypass air discharge system are connected; the oxygen generating system is respectively connected with one section of the two-section cooler, the kiln head burner, the kiln door cover or the tertiary air pipe.
The embodiment of the application can also adopt the following technical scheme:
in the cement process system utilizing the alternative fuel oxy-fuel combustion coupled carbon capture, further, the waste heat power generation and waste gas treatment system comprises a waste heat power generation A and a humidifying tower which are connected in parallel, the waste heat power generation A and the humidifying tower are sequentially connected with a high-temperature fan, a dust collector A and a heat accumulating type incinerator after being connected in parallel, a waste heat power generation B and a water spraying device are connected in parallel, one end of the waste heat power generation B is connected with the heat accumulating type incinerator after being connected in parallel, and the other end of the waste heat power generation B is connected with a desulfurization device;
the bypass air bleeding system comprises a quenching chamber A, a dust collector B, a fan B and a quenching chamber B which are sequentially connected, wherein the quenching chamber A is connected with the fan A, the quenching chamber B is connected with the fan C, and the fan A and the fan C blow low-temperature high-concentration CO out of the fan F 2 The exhaust pipeline of the bypass air release system is communicated with the oxygen generation system and is connected with the first section of the second-section cooler;
the raw material mill system comprises a raw material mill and an air cooler which are connected in parallel, the raw material mill and the air cooler are sequentially connected with a dust collector C and a fan D after being connected in parallel, one part of air which is discharged out of the raw material mill system goes to a second section of a cooler to be used as cooling air, and the other part of the air goes to a chimney and is discharged into the atmosphere.
In the cement process system utilizing the alternative fuel oxy-fuel combustion coupled carbon capture, further, the fan F is connected with the system air leakage equipment, and the system air leakage equipment comprises kiln head sealing equipment, kiln tail sealing equipment, a waste heat power generation A dust removal device, a dust collector A and a dust collector B dust removal device.
High concentration CO exiting the fan F 2 One part of the smoke is sent to the air leakage equipment of the system to replace air to enter the system.
The cement production method by using the alternative fuel oxy-fuel combustion coupled carbon capture adopts the cement process system by using the alternative fuel oxy-fuel combustion coupled carbon capture, and comprises the following steps:
step one, alternative fuels are respectively fed from a rotary kiln combustor and a decomposing furnace, and when the rotary kiln combustor and the decomposing furnace operate, O in flue gas at an outlet of the decomposing furnace is controlled 2 The content is less than 2.5%, the CO content is 5000-10000ppm, and the air quantity at the outlet of the decomposing furnace is 1.2-1.3Nm 3 Cl, dry basis of flue gas CO 2 The concentration is more than or equal to 80 percent;
step two, after the clean waste gas of the waste gas from the preheater after the waste heat power generation and treatment process is condensed by a cooling and condensing device to remove moisture, the clean waste gas is treated by a cooling and condensing deviceHeating to 35-45 deg.C by reheating device, wherein a part of high concentration CO 2 The flue gas is induced to a carbon capture and purification device by a fan E, and the other part of high-concentration CO is 2 The flue gas is respectively sent to a first section of a second-section cooler, a kiln head burner and a kiln tail burner, and a quenching chamber A and a quenching chamber B of a bypass air release system through a fan F;
o produced by oxygen production system 2 Respectively sprayed into the first section of the second-section cooler, a kiln head burner, a kiln door cover or a tertiary air pipe.
The invention passes low air flow and high concentration CO 2 Flue gas circulation realizes alternative fuel oxy-fuel combustion coupling carbon capture technology, reduces CO 2 Capture purification and operating costs.
In the above cement production method using oxy-fuel combustion coupled carbon capture as an alternative fuel, further, the waste heat power generation and treatment process in the second step includes the following steps: waste heat power generation A is carried out or the temperature is reduced through a humidifying tower to the waste gas of going out the preheater, and the waste gas is cooled to below 200 ℃, and the waste gas gets into dust collector A behind high temperature fan and gathers dust, the amount of wind and the CO concentration of going out the preheater are controlled to high temperature fan, and dust concentration of the waste gas of dust collector A export is controlled at 10mg/Nm 3 Then the waste gas enters a regenerative type incinerator, CO in the waste gas provides partial fuel for the waste gas, and harmful gas VOCs is burnt at high temperature to control the concentration of the VOCs to be 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation B or the water spraying device, and is desulfurized through the desulphurization device, SO that SO in the waste gas is removed 2 Emission control 35mg/Nm 3 The following.
CO in the waste gas provides part of fuel for the regenerative incinerator, so that the consumption of fossil fuel is reduced, and VOCs in the waste gas are treated at high temperature.
In the above cement production method using oxy-fuel combustion coupled carbon capture as alternative fuel, the second step is further followed by the following steps: a bypass air release process: 5-30% of flue gas discharged from the kiln is extracted from the smoke chamber, and the high-concentration CO with the temperature of 35-45 ℃ obtained in the second step is blown into the smoke chamber 2 The flue gas as cooling air enters a quenching bypass air bleeding system of a quenching chamber A, and then enters a dust collector B for collecting dustBlowing in the high-concentration CO with the temperature of 35-45 ℃ obtained in the second step 2 The flue gas is used as cooling air to carry out quenching bypass air release on the flue gas of a quenching bypass air release system in a quenching chamber B, and the bypass air release high-concentration CO after secondary cooling 2 The temperature of the flue gas reaches 100-150 ℃, and the flue gas is discharged from a bypass air discharge system to be low-temperature high-concentration CO 2 O produced by the flue gas and the oxygen production system obtained in the second step 2 And the mixed air is used as cooling air and enters a first section of a second section cooler.
The high-concentration CO at 35-45 ℃ obtained in the second step 2 Flue gas enters the bypass air-bleeding system for recycling as cooling air of the quenching chamber, heat of the flue gas of the bypass air-bleeding system is utilized, heat recovery is carried out, and waste gas of the bypass air-bleeding system does not need to be subjected to environment-friendly waste gas treatment independently.
In the above cement production method using oxy-fuel combustion coupled carbon capture as an alternative fuel, the second step is further followed by the following steps: the two-stage cooler process comprises: the front roller type crusher resistant to the temperature of 850 ℃ is arranged, a partition wall is arranged at the position of the crusher to separate a first section of a cooler from a second section of the cooler, and a first section of air blower of the cooler is introduced into O produced by the oxygen production system in the first step 2 Cooling air from the bypass air bleeding system and high concentration CO from the air outlet machine F 2 Flue gas; and introducing air or part of waste gas from a fan D of the raw material grinding system into a second-stage blower of the cooler.
The residual air temperature of the cooling machine is 250-300 ℃, and the air quantity is 1.0-1.3Nm 3 And/kg, cl, drying the raw material in a raw material mill system or cooling the raw material by an air cooler, then removing dust by a dust collector C, wherein the temperature of the waste gas discharged from the raw material mill is 100-150 ℃, one part of the waste gas enters a two-stage cooling air to cool the clinker in the two stages, and the rest part of the waste gas is discharged into the atmosphere.
In the above cement production method using oxy-fuel combustion coupled carbon capture as alternative fuel, the second step is further followed by the following steps: the cooler waste air heat recycling process comprises the following steps: after the residual air of the cooler goes to a raw material mill system for drying raw materials or is cooled by an air cooler, dust is removed by a dust collector, part of waste gas enters a second section of the second-section cooler, and the rest of waste gas is discharged into the atmosphere.
In the above cement production method using alternative fuel oxy-fuel combustion coupled carbon capture, further, an air lock device is arranged at a feeding point and a blanking pipe for feeding the alternative fuel of the decomposing furnace, so that O in the waste gas out of the preheater 2 The content is less than 2 percent, the CO content is 4000-9000ppm, and the flue gas dry basis is CO 2 The concentration is more than or equal to 80 percent, and the air quantity at the outlet of the preheater is 1.3-1.4Nm 3 /kg.cl；
The preheater or the decomposing furnace is provided with a denitration device for enabling NO x Discharge to 100mg/Nm 3 The following;
the alternative fuel is fed from the decomposing furnace in multiple layers, the fuel with the grain diameter 3D < -50mm, the fuel with the grain diameter 2D < -200mm is arranged in the middle of the decomposing furnace, the fuel with the grain diameter 3D < -5 mm and the fuel with the grain diameter 2D < -50mm are arranged in the lower part of the decomposing furnace.
The positions of the air locking device, the fire clay smearing and reinforcing blanking pipe air locking, a manhole door, a dust poking hole and the like are sealed, so that air leakage points of a preheater system are reduced. The alternative fuels in the decomposing furnace are distributed in a layered mode, the combustion of the alternative fuels is controlled in order, and the decomposition furnace is prevented from being crusted.
A switchable air and oxy-fuel combustion cement production method, comprising the following steps:
when alternative fuel-air combustion methods are adopted: air is respectively sent to cooling air of a cooler, fuel air sent from the head and the tail of the kiln and cooling air of a bypass air discharge system through a fan;
when an alternative fuel oxy-fuel combustion coupled carbon capture method is adopted: removing most of water from the clean waste gas after waste heat power generation and environment-friendly waste gas treatment by cooling and condensing equipment to obtain dry-based CO of the flue gas 2 High concentration CO with concentration more than or equal to 80% 2 Heating the flue gas to 35-45 deg.C by reheater, wherein a part of high-concentration CO 2 The flue gas is induced to a carbon capture and purification device by a fan, and the other part of high-concentration CO 2 The flue gas is respectively sent to cooling air of a cooler, fuel air sent from the head and the tail of the kiln, cooling air of a bypass air release system and air used by equipment with easy air leakage of the system through a fan.
When alternative fuel-air combustion methods are adopted, the furnace outlet is reduced by the presence of COThe air quantity reduces the heat consumption of the whole system and the investment and the operation cost of the waste gas treatment environment-friendly equipment. When adopting the alternative fuel oxy-fuel combustion coupled carbon capture method, the high-concentration CO is used 2 Flue gas circulation realizes oxy-fuel combustion and carbon capture technology, reduces CO 2 Capturing, purifying and operating cost; the existence of CO reduces the air quantity at the outlet of the decomposing furnace, and reduces the heat consumption of the whole system and the investment and the operation cost of waste gas treatment environment-friendly equipment. The invention can rapidly switch air combustion and oxy-fuel combustion when CO is generated 2 When the utilization amount is small, an air combustion mode is adopted, and when CO is generated 2 When the utilization amount is large, a total oxygen combustion coupling carbon capture scheme is adopted.
One or more technical schemes provided in the embodiment of the application have at least the following beneficial effects:
1. the invention adopts the total oxygen combustion technology prepared by pure oxygen and circulating flue gas to process the alternative fuel, the oxygen concentration of the mixed gas is higher than the air oxygen concentration by 21 percent, which is beneficial to the combustion of the alternative fuel with low heat value, and the heat substitution rate of the alternative fuel applied to the cement kiln can reach more than 90 percent, because no N is present 2 Can obviously improve the CO content in the flue gas 2 Concentration, dry basis CO of flue gas at outlet of preheater 2 The concentration is more than or equal to 80 percent, the CO concentration is 4000-9000ppm, the pure oxygen consumption and the oxygen production cost can be reduced, the air quantity at the outlet of the preheater is greatly reduced, the heat consumption of the system is reduced by 80-100kcal/kg 2 Capture purification and operating costs.
2. The cooler adopts a two-section type front-end roller crushing cooler, the roller crushing temperature can endure the temperature of 850 ℃ for a long time, the sealing structure is reasonably designed, secondary air, tertiary air and kiln head residual air are not blown by each other, and dry-based CO of the smoke at the outlet of the kiln tail preheater is ensured in a total oxygen combustion mode 2 The concentration is more than or equal to 80 percent; the cooling machine adopts pure oxygen and high-concentration CO 2 Mixed gas of flue gas and high concentration CO 2 Cooling the smoke and the air in a subarea manner, and respectively utilizing the smoke and the air; the cooler can ensure that the heat efficiency of the grate cooler is not reduced under the condition that the secondary air quantity and the tertiary air quantity of the oxy-fuel combustion are greatly reduced.
3. Flue gas circulation device of bypass air release systemAnd (3) utilization and heat recovery: the bypass air release system is low-temperature and high-concentration CO 2 After the flue gas is cooled in two stages, the problem that the burning system is easy to crust and block due to the circulation of harmful components in the system is solved, and the cooled high-concentration CO 2 The flue gas can enter the cooler to be used as cooling air, so that the desulfurization and denitrification environmental-friendly equipment of a bypass air release system is saved, part of heat is recycled, and CO is also realized 2 And circulating the flue gas in the system.
4. The equipment (kiln head sealing equipment 37, kiln tail sealing equipment 38, waste heat power generation A7 dust removing device, dust collector A10 and dust collector B17 dust removing device) with easy air leakage of the system adopts high-concentration CO 2 The smoke prevents air leakage, and ensures the outlet of the preheater and CO 2 Collecting and purifying flue gas dry-based CO 2 The concentration is more than or equal to 80 percent.
5. The high-temperature fan is reasonably controlled to pull air, the air quantity at the outlet of the decomposing furnace is reduced through the existence of CO in the decomposing furnace, and the heat consumption of the whole system and the investment and the running cost of waste gas treatment environment-friendly equipment are reduced.
6. The invention can rapidly switch air combustion and oxy-fuel combustion modes when CO 2 When the utilization amount is small, an air combustion mode is adopted, and when CO is used 2 When the utilization amount is large, a total oxygen combustion coupling carbon capture scheme is adopted.
Drawings
Technical solutions of embodiments of the present application will be described in further detail below with reference to the accompanying drawings, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present application. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein only, and are not necessarily drawn to scale.
FIG. 1 is a flow chart of a production process provided by an embodiment of the present invention;
FIG. 2 is an enlarged partial view of the bypass venting system portion of FIG. 1 of the present specification;
FIG. 3 is a partial enlarged view of the cogeneration portion of FIG. 1 of the specification;
FIG. 4 is a partially enlarged view of the ground portion of the raw material shown in FIG. 1.
FIG. 5 is an enlarged view of a portion of the oxygen generation system of FIG. 1 of the specification.
Fig. 6 is a partially enlarged view of the carbon trapping part shown in fig. 1 in the specification.
In the figure:
in the figure, the dotted arrow lines indicate the direction of gas flow, the solid arrow lines indicate the direction of flow,
1. a preheater; 2. a decomposing furnace; 3. a smoking room; 4. a rotary kiln; 5. a kiln door cover; 6. a cooling machine; 601. a first section of a cooler; 602. a second section of a cooler;
7. generating power by waste heat A; 8. a humidifying tower; 9. a high temperature fan; 10. a dust collector A; 11. a regenerative incinerator; 12. generating power B by waste heat; 13. A water spraying device; 14. a desulfurization unit;
15. a quench chamber A; 16. a fan A; 17. a dust collector B; 18. a fan B; 19. a quench chamber B; 20. a fan C;
21. grinding raw materials; 22. an air cooler; 23. a dust collector C; 24. a fan D; 25. a chimney;
26: a denitration device; 27. a wind locking device;
28. a cooling and condensing device; 29. a reheating device; 30. a fan E; 31. a carbon capture purification device; 32. a fan F; 33. an oxygen generation system; 34. a kiln head burner; 35. a tertiary air pipe; 36. a kiln tail burner; 37. kiln head sealing equipment; 38. kiln tail sealing equipment; 39. a front roll crusher; 40. a partition wall.
Detailed Description
The cement production method by utilizing alternative fuel oxy-fuel combustion coupled carbon capture comprises the following steps:
the preheater 1 and the preheater 1 can specifically select the number of the preheater according to the requirement of drying the raw material moisture, the preheater 1 is connected with the decomposing furnace 2 for calcining the alternative fuel, the decomposing furnace 2 is connected with the smoke chamber 3, the smoke chamber 3 is connected with the rotary kiln 4, and the rotary kiln 4 is connected with the kiln door cover 5 and the two-stage cooler 6.
The decomposing furnace 2 adopts alternative combustion of fuel, and adopts high-concentration CO when the fuel enters the decomposing furnace for three times 2 The mixed gas of the flue gas and the pure oxygen is reduced to be discharged out of the decomposing furnace 2 The content of the waste gas at the outlet of the decomposing furnace is 5000-10000ppm CO, thereby reducing the purityThe oxygen consumption and the oxygen production cost are reduced, and the waste gas air volume at the outlet of the preheater is reduced to 1.3-1.4Nm 3 Cl, to achieve the aim of reducing the heat consumption of the system.
The waste gas outlet of the preheater 1 is connected with the waste heat power generation 7, the waste heat power generation 7 is connected with the humidifying tower 8 when not working, the cooled waste gas is pulled to the dust collector A10 through the high-temperature fan 9 to collect dust, then harmful gases such as CO and VOCs are treated through the heat accumulating type incinerator 11, and the CO can help the heat accumulating type incinerator 11 to save the consumption of fossil fuels. The treated waste gas is cooled again through the waste heat power generation B12 or the water spraying device 13 (the waste heat power generation 12 enters the water spraying device 13 when not working), and then enters the desulfurization device 14 for desulfurization treatment, so that the waste gas reaches the environmental-friendly emission index.
The desulfurizing device 14 is connected with a cooling condensing device 28 to remove most of water and obtain dry-based CO of the flue gas 2 The concentration is more than or equal to 80 percent, and then the mixture is heated to 35 to 45 ℃ by a reheating device 29, wherein part of high-concentration CO 2 The flue gas is induced to a carbon capture and purification device 31 by a fan E30, and the other part of high-concentration CO 2 The flue gas is respectively sent to a first section of a second-section cooler 6, a kiln head combustor 34, a kiln tail combustor 36, a bypass air discharge system quench chamber A15, a quench chamber B19 and equipment (a kiln head sealing device 37, a kiln tail sealing device 38, a waste heat power generation A7 dust removal device, a dust collector A10 and a dust collector B17 dust removal device) which is easy to leak air in the system through a fan F32.
O produced by oxygen production system 33 2 Respectively sprayed into a kiln head burner 34, a kiln door cover 5 or a first section of a second section cooler 6, or a tertiary air pipe 35 to be used for burning alternative fuel at the kiln head and the kiln tail; one end of the tertiary air pipe 35 is connected with the decomposing furnace 2, and the other end is connected with the kiln door cover 5 or the second-stage cooler 6.
The smoke chamber 3 is connected with a bypass air discharge system for treating harmful components such as chloralkali and the like, the exhaust gas from the kiln passes through a quenching chamber 15, and a fan A16 blows high-concentration CO at 35-45 DEG C 2 The flue gas enters a quenching chamber 15 for cooling, dust is collected by a dust collector 17, air is drawn by a fan 18, and high-concentration CO at 35-45 ℃ is blown by a fan C20 2 The flue gas enters a quenching chamber B19, the temperature of the waste gas is further reduced to 100-150 ℃, and then high-concentration CO is generated 2 The flue gas enters the second stage as cooling airThe segment cooler 6 cools the clinker.
The first-stage blower of the second-stage cooler 6 is introduced into the O produced by the oxygen production system 33 2 Low-temperature high-concentration CO discharged by bypass air discharge system 2 Flue gas and pure oxygen mixture, and high concentration CO after reheater 29 2 The flue gas and the clinker undergo heat exchange, and then become high-temperature secondary air and tertiary air for recycling. And introducing air or part of waste gas from a fan D24 of the raw material grinding system into a second-stage blower of the cooler.
And a cooling machine residual air outlet is connected with a raw material mill 21 for drying raw materials, the raw material mill 21 is connected with an air cooler 22 when not working, cooled waste gas is collected by a dust collector 23 and then passes through a fan D24, a part of cooled waste gas enters a two-stage cooler 6 as cooling air to cool clinker, and a part of cooled waste gas enters a chimney 25 for emission.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
The cement production method utilizing alternative fuel oxy-fuel combustion coupled carbon capture comprises the following steps:
alternative fuel oxy-fuel combustion technology: o produced by the oxygen production system 33 by feeding alternative fuel from the rotary kiln burner and the decomposing furnace respectively 2 Respectively spraying the mixture into a kiln head burner 34 and a first section of a second-section cooler 6, wherein one end of a tertiary air pipe 35 is connected with the decomposing furnace 2, and the other end of the tertiary air pipe is connected with a first section of an upper shell of the second-section cooler 6 so as to be used for burning alternative fuel at the kiln head and the kiln tail; a part of high concentration CO 2 The circulating flue gas enters a first section of a second section cooler 6, a kiln head burner 34, a kiln tail burner 36, a quenching chamber A15 and a quenching chamber B19 of a bypass air release system, and O in the flue gas at the outlet of the decomposing furnace 2 is controlled during operation 2 The content is less than 2.5 percent, the CO content is 5000-10000ppm, and the dry basis of the flue gas is CO 2 The concentration is more than or equal to 80 percent, and the air quantity at the outlet of the decomposing furnace 2 is 1.2-1.3Nm 3 Cl, the pure oxygen quantity required by the combustion of the alternative fuel and the air quantity at the outlet of the decomposing furnace are reduced through the oxy-fuel combustion technology and the existence of CO, and the dry basis CO of the flue gas is ensured 2 The concentration is more than or equal to 80 percent.
Waste heat power generation and environment-friendly waste gas treatment: the waste gas from the preheater is cooled through waste heat power generation or a humidifying tower 8, the waste gas enters a dust collector A10 for dust collection after passing through a high-temperature fan 9 and then enters a heat accumulating type incinerator 11, CO in the waste gas provides part of fuel for the waste gas, and harmful gas VOCs is combusted at high temperature, so that the concentration of the VOCs is controlled to be 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation B12 or the water spraying device 13, and is desulfurized through the desulfurizing device 14, SO that SO in the waste gas is 2 Emission control 35mg/Nm 3 The following.
A carbon capture system: the desulfurizer 14 is connected with a cooling and condensing device 28 to remove most of the water to obtain the flue gas dry basis CO 2 The concentration is more than or equal to 80 percent, and then the mixture is heated to 35 to 45 ℃ by a reheating device 29, wherein part of high-concentration CO 2 The flue gas is induced to a carbon capture and purification device 31 by a fan E30, and the other part of high-concentration CO 2 The flue gas is respectively sent to cooling air of a cooler, fuel air sent from the head and the tail of the kiln, cooling air of a bypass air release system and air used by equipment with easy air leakage of the system through a fan F32.
Bypass air-bleed flue gas circulation system and heat recovery utilize: extracting 5-30% (volume percentage) of flue gas discharged from kiln from smoke chamber, and blowing high-concentration CO at 35-45 deg.C 2 Quenching as cooling air, collecting dust in a dust collector B17, and blowing 35-45 deg.C high concentration CO 2 The secondary cooling flue gas temperature reaches 100-150 ℃, and the flue gas enters a first section of a two-section cooler 6 as cooling air to cool the clinker, thereby saving the desulfurization and denitrification environmental protection equipment of a bypass air release system, recycling a part of heat, and realizing CO 2 And circulating the flue gas in the system.
The technology of a two-stage cooler comprises the following steps: o produced by introducing a first blower of a second-stage cooler 6 into an oxygen production system 33 2 Low-temperature high-concentration CO discharged by bypass air discharge system 2 Flue gas and pure oxygen mixture, and high concentration CO after reheater 29 2 The flue gas and the clinker are subjected to heat exchange, and then become high-temperature secondary air and tertiary air for recycling. And introducing air or part of waste gas from a fan D24 of the raw material grinding system into a second-stage blower of the cooler. The residual air outlet of the cooler is connected with a raw material mill 21And drying the raw materials, connecting an air cooler 22 when a raw material mill 21 does not work, collecting dust of cooled waste gas by a dust collector 23, then feeding a part of the cooled waste gas into a secondary cooler 6 through a fan D24 to cool the clinker, and feeding a part of the cooled waste gas into a chimney 25 to discharge the cooled waste gas.
High-concentration CO is blown into equipment (kiln head sealing equipment 37, kiln tail sealing equipment 38, waste heat power generation A7 dust removal device, dust collector A10 and dust collector B17 dust removal device) with easy air leakage of the system 2 Circulating flue gas to make preheater outlet and CO 2 Collecting and purifying flue gas dry-based CO 2 The concentration is more than or equal to 80 percent.
Example 2
The cement production method utilizing alternative fuel oxy-fuel combustion coupled carbon capture comprises the following steps:
alternative fuel oxy-fuel combustion technology: o produced by the oxygen production system 33 by feeding alternative fuel from the rotary kiln burner and the decomposing furnace respectively 2 Respectively spraying the mixture into a kiln head burner 34 and a kiln door cover 5, wherein one end of a tertiary air pipe 35 is connected with the decomposing furnace 2, and the other end is connected with the kiln door cover 5 so as to be used for burning alternative fuel at the front and the tail of the kiln; a part of high concentration CO 2 The circulating flue gas enters a first section of a second section cooler 6, a kiln head burner 34, a kiln tail burner 36, a quenching chamber A15 and a quenching chamber B19 of a bypass air release system, and O in the flue gas at the outlet of the decomposing furnace 2 is controlled during operation 2 The content is less than 2.5 percent, the CO content is 5000-10000ppm, and the dry basis of the flue gas is CO 2 The concentration is more than or equal to 80 percent, and the air quantity at the outlet of the decomposing furnace 2 is 1.2-1.3Nm 3 Cl, the pure oxygen quantity required by the combustion of the alternative fuel and the air quantity at the outlet of the decomposing furnace are reduced through the oxy-fuel combustion technology and the existence of CO, and the dry basis CO of the flue gas is ensured 2 The concentration is more than or equal to 80 percent.
Waste heat power generation and environment-friendly waste gas treatment: the waste gas from the preheater is cooled through waste heat power generation or a humidifying tower 8, the waste gas enters a dust collector A10 for dust collection after passing through a high-temperature fan 9 and then enters a heat accumulating type incinerator 11, CO in the waste gas provides part of fuel for the waste gas, and harmful gas VOCs is combusted at high temperature, so that the concentration of the VOCs is controlled to be 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation B12 or the water spraying device 13, and is desulfurized through the desulfurizer 14,make SO in the waste gas 2 Emission control 35mg/Nm 3 The following.
A carbon capture system: the desulfurizer 14 is connected with a cooling and condensing device 28 to remove most of the water to obtain the flue gas dry basis CO 2 The concentration is more than or equal to 80 percent, and then the mixture is heated to 35 to 45 ℃ by a reheating device 29, wherein part of high-concentration CO 2 The flue gas is induced to a carbon capture and purification device 31 by a fan E30, and the other part of high-concentration CO 2 The flue gas is respectively sent to cooling air of a cooler, fuel air sent from the head and the tail of the kiln, cooling air of a bypass air release system and air used by equipment with easy air leakage of the system through a fan F32.
Bypass air-bleeding flue gas circulation system and heat recovery and utilization: 5-30% (volume percentage) of flue gas discharged from kiln is extracted from smoke chamber, and high-concentration CO is blown into the smoke chamber at 35-45 deg.C 2 Quenching as cooling air, collecting dust in a dust collector B17, and blowing 35-45 deg.C high concentration CO 2 The secondary cooling flue gas temperature reaches 100-150 ℃, and the secondary cooling flue gas enters a second-stage cooler 6 as cooling air to cool the clinker, so that the desulfurization and denitrification environmental protection equipment of a bypass air release system is saved, part of heat is recovered, and CO is realized 2 And circulating the flue gas in the system.
The technology of a two-stage cooler comprises the following steps: the second-stage cooler 6 first-stage blower is introduced into the low-temperature high-concentration CO discharged by the bypass air discharge system 2 Flue gas, and high concentration CO after reheater 29 2 The flue gas and the clinker are subjected to heat exchange, and then become high-temperature secondary air and tertiary air for recycling. And introducing air or part of waste gas discharged from a fan D24 of the raw material grinding system into a second-stage blower of the cooler.
And a cooling machine residual air outlet is connected with a raw material mill 21 for drying raw materials, the raw material mill 21 is connected with an air cooler 22 when not working, cooled waste gas is collected by a dust collector 23 and then passes through a fan D24, a part of cooled waste gas enters a two-stage cooler 6 as cooling air to cool clinker, and a part of cooled waste gas enters a chimney 25 for emission.
High-concentration CO is blown into equipment (kiln head sealing equipment 37, kiln tail sealing equipment 38, waste heat power generation A7 dust removal device, dust collector A10 and dust collector B17 dust removal device) with easy air leakage of the system 2 Circulating flue gas to make preheaterOutlet and CO 2 Collecting and purifying flue gas dry-based CO 2 The concentration is more than or equal to 80 percent.
Example 3
The cement production method utilizing alternative fuel oxy-fuel combustion coupled carbon capture comprises the following steps:
alternative fuel oxy-fuel combustion technology: o produced by the oxygen production system 33 by feeding alternative fuel from the rotary kiln burner and the decomposing furnace respectively 2 Respectively sprayed into a kiln head burner 34 and a kiln door cover 5 to be used for burning the kiln head substitute fuel, and the O produced by an oxygen production system 33 2 Spraying a tertiary air pipe for burning the kiln tail alternative fuel; one end of the tertiary air pipe 35 is connected with the decomposing furnace 2, and the other end is connected with the first section upper shell of the second section cooler 6; a part of the high concentration CO 2 The circulating flue gas enters a first section of a second section cooler 6, a kiln head burner 34, a kiln tail burner 36, a bypass air release system quenching chamber A15 and a quenching chamber B19, and O in the flue gas at the outlet of the decomposing furnace 2 is controlled during operation 2 The content is less than 2.5 percent, the CO content is 5000-10000ppm, and the dry basis of the flue gas is CO 2 The concentration is more than or equal to 80 percent, and the air quantity at the outlet of the decomposing furnace 2 is 1.2-1.3Nm 3 Cl, the pure oxygen quantity required by the combustion of the alternative fuel and the air quantity at the outlet of the decomposing furnace are reduced through the oxy-fuel combustion technology and the existence of CO, and the dry basis CO of the flue gas is ensured 2 The concentration is more than or equal to 80 percent.
Waste heat power generation and environment-friendly waste gas treatment: the waste gas from the preheater is cooled through waste heat power generation or a humidifying tower 8, the waste gas enters a dust collector A10 for dust collection after passing through a high-temperature fan 9 and then enters a regenerative incinerator 11, CO in the waste gas provides part of fuel for the waste gas, and harmful gas VOCs is combusted at high temperature, so that the concentration of the VOCs is controlled at 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation B12 or the water spraying device 13, and is desulfurized through the desulfurizing device 14, SO that SO in the waste gas is removed 2 Emission control 35mg/Nm 3 The following.
A carbon capture system: the desulfurizer 14 is connected with a cooling and condensing device 28 to remove most of the water to obtain the flue gas dry basis CO 2 The concentration is more than or equal to 80 percent, and then the mixture is heated to 35 to 45 ℃ by a reheating device 29, wherein part of high-concentration CO 2 The flue gas is induced to carbon capture by a fan E30Purification apparatus 31, another part of high concentration CO 2 The flue gas is respectively sent to cooling air of a cooler, fuel air sent from the head and the tail of the kiln, cooling air of a bypass air release system and air used by equipment with easy air leakage of the system through a fan F32.
Bypass air-bleed flue gas circulation system and heat recovery utilize: extracting 5-30% (volume percentage) of flue gas discharged from kiln from smoke chamber, and blowing high-concentration CO at 35-45 deg.C 2 Quenching as cooling air, collecting dust in a dust collector B17, and blowing 35-45 deg.C high concentration CO 2 The secondary cooling flue gas temperature reaches 100-150 ℃, and the secondary cooling flue gas enters a second-stage cooler 6 as cooling air to cool the clinker, so that the desulfurization and denitrification environmental protection equipment of a bypass air release system is saved, part of heat is recovered, and CO is realized 2 And circulating the flue gas in the system.
Two-stage cooler technology: the second-stage cooler 6 first-stage blower is introduced into the low-temperature high-concentration CO discharged by the bypass air discharge system 2 Flue gas, and high concentration CO after reheater 29 2 The flue gas and the clinker undergo heat exchange, and then become high-temperature secondary air and tertiary air for recycling. And introducing air or part of waste gas from a fan D24 of the raw material grinding system into a second-stage blower of the cooler.
And a cooling machine residual air outlet is connected with a raw material mill 21 for drying raw materials, the raw material mill 21 is connected with an air cooler 22 when not working, cooled waste gas is collected by a dust collector 23 and then passes through a fan D24, a part of cooled waste gas enters a two-stage cooler 6 as cooling air to cool clinker, and a part of cooled waste gas enters a chimney 25 for emission.
High-concentration CO is blown into equipment (kiln head sealing equipment 37, kiln tail sealing equipment 38, waste heat power generation A7 dust removal device, dust collector A10 and dust collector B17 dust removal device) with easy air leakage of the system 2 Circulating flue gas to make preheater outlet and CO 2 Collecting and purifying flue gas dry-based CO 2 The concentration is more than or equal to 80 percent.
Example 4
When alternative fuel-air combustion methods are adopted:
the substitute fuel with 35-55% heat proportion is fed from the rotary kiln burner, and the substitute fuel with 45-65% heat proportion is fed from the decomposing furnace, whereinLarge particle size (3D)<50mm，2D<200 mm) is arranged in the middle of the decomposing furnace, and the grain diameter is small (3D)<5mm，2D<50 mm) is arranged at the lower part of the decomposing furnace, and the alternative fuels in the decomposing furnace are distributed in a layered manner, so that the combustion of the alternative fuels is controlled in order, and the crusting of the decomposing furnace is avoided. The high-temperature fan 9 is used for controlling the O in the flue gas at the outlet of the decomposing furnace 2 2 The content is less than 2.5 percent, the CO content is 5000-10000ppm, and the air quantity at the outlet of the decomposing furnace 2 is 1.3-1.4Nm 3 Cl, the air quantity at the outlet of the decomposing furnace and the NOx emission are reduced to 300-500mg/Nm through the existence of CO 3 。
Three air locking devices are arranged at the feeding point of the solid alternative fuel feeding decomposing furnace to strengthen the sealing of the air locking device of the feeding pipe, a manhole door, a dust poking hole and the like so as to reduce air leakage points of a preheater system and ensure that O in waste gas discharged out of the preheater 2 The content is less than 2 percent, the CO content is 4000-9000ppm, and the air quantity at the outlet of the preheater is 1.35-1.55Nm 3 Cl, a preheater or a decomposing furnace is provided with a denitration device, and NOx is discharged to 100mg/Nm 3 The following.
Waste heat power generation and environment-friendly waste gas treatment: waste gas discharged from the preheater is subjected to waste heat power generation or is cooled through a humidifying tower 8, the temperature of the waste gas is reduced to be below 200 ℃, the waste gas enters a dust collector A10 through a high-temperature fan for dust collection, and the concentration of dust in the waste gas at the outlet of the dust collector is controlled to be 10mg/Nm 3 Then the waste gas enters a regenerative thermal oxidizer 11, CO in the waste gas provides partial fuel for the waste gas, and harmful gas VOCs is burnt at high temperature to control the concentration of the VOCs to be 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation or water spraying device 13, and is desulfurized through the desulfurizing device 14, SO that SO in the waste gas is removed 2 Emission control 35mg/Nm 3 The following. CO in the waste gas provides part of fuel for the regenerative thermal oxidizer 11, so that the consumption of fossil fuel is reduced, and VOCs in the waste gas is treated at high temperature.
Bypass air bleeding system and heat recovery: and (3) extracting flue gas which is discharged from the kiln in a proportion (volume percentage) of 5-30% from a smoke chamber, blowing air as cooling air for quenching, then entering a dust collector for dust collection, blowing air again for secondary cooling to ensure that the temperature of the flue gas is 100-150 ℃, and taking the flue gas as cooling air to enter a cooling machine for cooling clinker. The heat of the flue gas of the bypass air release system is utilized, heat recovery is carried out, and the waste gas of the bypass air release system does not need environment-friendly waste gas treatment.
And (3) recycling the waste heat of the cooler: the residual air temperature of the cooler is 250-300 ℃, and the air quantity is 1.0-1.3Nm 3 And (c) cl, drying the raw material in a raw material mill system or cooling the raw material by an air cooler, then removing dust by a dust collector, wherein the temperature of the waste gas discharged from the raw material mill is 100-150 ℃, one part of the waste gas is used as cooling air to cool the clinker, and the rest is discharged into the atmosphere.
When the alternative fuel oxy-fuel combustion coupled carbon capture method is adopted:
the substitute fuel with 35-55% heat proportion is fed from the kiln head burner 34, and the substitute fuel with 45-65% heat proportion is fed from the decomposing furnace 2, wherein the particle size is large (3D)<50mm，2D<200 mm) is arranged in the middle of the decomposing furnace, and the grain diameter is small (3D)<5mm，2D<50 mm) is arranged at the lower part of the decomposing furnace, and the alternative fuels in the decomposing furnace 2 are distributed in a layered way, so that the combustion of the alternative fuels is controlled in order, and the crusting of the decomposing furnace is avoided. O produced by oxygen production system 33 2 Respectively sprayed into a kiln head burner 34, a kiln door cover 5 or a first section of a second section of a cooler 6 or a tertiary air pipe 35 to be used for burning alternative fuel at the kiln head and the kiln tail; the high-temperature fan 9 is used for controlling the O in the flue gas at the outlet of the decomposing furnace 2 2 The content is less than 2.5 percent, the CO content is 5000-10000ppm, and the dry basis of the flue gas is CO 2 The concentration is more than or equal to 80 percent, and the air quantity at the outlet of the decomposing furnace 2 is 1.2-1.3Nm 3 Cl, reducing the air quantity at the outlet of the decomposing furnace and the NOx emission to 300-500mg/Nm through the existence of CO 3 。
Three air locking devices are arranged at feeding points of the solid alternative fuel feeding decomposing furnace, and the air locking devices of the discharging pipe, the manhole door, the ash poking hole and the like are enhanced to be sealed, so that air leakage points of a preheater system are reduced, and O in waste gas discharged out of the preheater is enabled 2 The content is less than 2 percent, the CO content is 4000-9000ppm, and the air quantity at the outlet of the preheater is 1.3-1.4Nm 3 Cl, a preheater or a decomposing furnace is provided with a denitration device, and NOx is discharged to 100mg/Nm 3 The following.
Waste heat power generation and environment-friendly waste gas treatment: waste gas from the preheater is subjected to waste heat power generation or is cooled through a humidifying tower 8, and the waste gas is cooledWhen the temperature is below 200 ℃, the waste gas enters a dust collector A10 for dust collection after passing through a high-temperature fan 9, and the concentration of the waste gas and dust at the outlet of the dust collector is controlled at 10mg/Nm 3 Then the waste gas enters a regenerative thermal oxidizer 11, CO in the waste gas provides partial fuel for the waste gas, and harmful gas VOCs is burnt at high temperature to control the concentration of the VOCs to be 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation B12 or the water spraying device 13, and is desulfurized through the desulfurizing device 14, SO that SO in the waste gas is 2 Emission control 35mg/Nm 3 The following. CO in the waste gas provides part of fuel for the regenerative thermal oxidizer 11, so that the consumption of fossil fuel is reduced, and VOCs in the waste gas is treated at high temperature.
Oxy-fuel combustion and carbon capture system: the desulfurizer 14 is connected with a cooling and condensing device 28 to remove most of the water to obtain the flue gas dry basis CO 2 The concentration is more than or equal to 80 percent, and then the mixture is heated to 35 to 45 ℃ by a reheating device 29, wherein part of high-concentration CO 2 The flue gas is induced to a carbon capture and purification device 31 by a fan E30, and the other part of high-concentration CO 2 The flue gas is respectively sent to cooling air of a cooler, fuel air sent from the head and the tail of the kiln, cooling air of a bypass air release system and air used by equipment with easy air leakage of the system through a fan F32.
Bypass air bleeding system and heat recovery: extracting 5-30% (volume percentage) of flue gas discharged from kiln from smoke chamber, and blowing high-concentration CO at 35-45 deg.C 2 Quenching as cooling air, collecting dust in a dust collector B17, and blowing 35-45 deg.C high concentration CO 2 The secondary cooling flue gas temperature reaches 100-150 ℃, and the secondary cooling flue gas is used as cooling air to enter a secondary cooling machine 6 to cool the clinker. The heat of the flue gas of the bypass air release system is utilized, heat recovery is carried out, and the waste gas of the bypass air release system does not need environment-friendly waste gas treatment.
And (3) recycling the waste heat of the cooler: the residual air temperature of the two-stage cooler 6 is 250-300 ℃, and the air quantity is 1.0-1.3Nm 3 And/kg, after the raw material is sent to a raw material mill system for raw material drying or is cooled by an air cooler, dust is removed by a dust collector C23, the temperature of the waste gas discharged from the raw material mill is 100-150 ℃, one part of the waste gas is used as cooling air to cool the clinker, and the rest is discharged into the atmosphere.
This implementationFor example, air combustion and oxy-fuel combustion modes can be rapidly switched within 3-4 hours, the heat substitution rate of the cement kiln for applying alternative fuels can reach more than 90%, although a decomposing furnace generates CO, the air volume of the whole kiln tail system is small, CO in waste gas is used as fuel, the heat accumulating type incinerator is helped to reduce fossil fuels, and harmful gases such as CO, VOCs and the like are removed; the system also utilizes bypass air release and heat recovery of the raw material mill, the waste gas of the bypass air release system does not need to be subjected to environmental protection treatment independently, the heat consumption of the whole cement production system is low, and the investment of waste gas treatment environmental protection equipment is greatly reduced. In addition, the invention couples the carbon capture technology under the oxy-fuel combustion mode, so that the flue gas at the outlet of the preheater is dry-based CO 2 The concentration is more than or equal to 80 percent, and the subsequent CO can be greatly reduced 2 Capture purification and operating costs.
The present invention has been described in detail with reference to the above examples, but the above description is only for the purpose of describing the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. Utilize alternative fuel oxy-fuel combustion coupling carbon entrapment's cement process systems, its characterized in that: the cement process system utilizing the alternative fuel oxy-fuel combustion coupled carbon capture comprises a preheater, a decomposing furnace, a smoke chamber, a rotary kiln and a secondary cooler which are sequentially connected, wherein the smoke chamber is connected with a bypass air discharge system, and the secondary cooler is connected with a raw material mill system;
clean waste gas which is discharged from the preheater and passes through a waste heat power generation and treatment system enters a cooling and condensing device, the cooling and condensing device is connected with a reheating device, the reheating device is connected with a carbon capture and purification device through a fan E, the reheating device is connected with a first section of a second-section cooler, a kiln head burner and a kiln tail burner through a fan F, and a fan A and a fan C of a bypass air discharge system are connected; the oxygen generating system is respectively connected with one section of the two-section cooler, the kiln head burner, the kiln door cover or the tertiary air pipe.
2. The cement process system with alternate fuel oxy-fuel combustion coupled carbon capture as claimed in claim 1, wherein:
the waste heat power generation and waste gas treatment system comprises a waste heat power generation A and a humidifying tower which are connected in parallel, the waste heat power generation A and the humidifying tower are sequentially connected with a high-temperature fan, a dust collector A and a heat accumulating type incinerator after being connected in parallel, a waste heat power generation B and a water spraying device are connected in parallel, one end of the waste heat power generation B is connected with the heat accumulating type incinerator after being connected in parallel, and the other end of the waste heat power generation B is connected with a desulfurization device;
the bypass air release system comprises a quenching chamber A, a dust collector B, a fan B and a quenching chamber B which are sequentially connected, wherein the quenching chamber A is connected with the fan A, the quenching chamber B is connected with the fan C, and the fan A and the fan C blow low-temperature high-concentration CO out of the fan F 2 The exhaust pipeline of the bypass air discharge system is communicated with the oxygen generation system and is connected with one section of the second-section cooler;
the raw material mill system comprises a raw material mill and an air cooler which are connected in parallel, the raw material mill and the air cooler are sequentially connected with a dust collector C and a fan D after being connected in parallel, one part of air which is discharged out of the raw material mill system is sent to a two-section cooler to be used as cooling air, and the other part of the air is sent to a chimney and is discharged into the atmosphere.
3. The cement process system with alternate fuel oxy-fuel combustion coupled carbon capture as claimed in claim 1, wherein: the fan F is connected with the system easy air leakage equipment, and the system easy air leakage equipment comprises kiln head sealing equipment, kiln tail sealing equipment, a waste heat power generation A dust removal device, a dust collector A and a dust collector B dust removal device.
4. The cement production method by utilizing alternative fuel oxy-fuel combustion coupled carbon capture is characterized by comprising the following steps of: the cement production method by using alternative fuel oxy-fuel combustion coupled carbon capture adopts the cement process system by using alternative fuel oxy-fuel combustion coupled carbon capture as claimed in claims 1-3, and the cement production method by using alternative fuel oxy-fuel combustion coupled carbon capture comprises the following steps:
step one, alternative fuels are respectively fed from a rotary kiln combustor and a decomposing furnace, and when the rotary kiln combustor and the decomposing furnace operate, O in flue gas at an outlet of the decomposing furnace is controlled 2 The content is less than 2.5%, and the content of CO isThe amount is 5000-10000ppm, and the air quantity at the outlet of the decomposing furnace is 1.2-1.3Nm 3 Cl, dry basis of flue gas CO 2 The concentration is more than or equal to 80 percent;
step two, after the clean waste gas from the waste gas out of the preheater through the waste heat power generation and treatment process is condensed by a cooling and condensing device to remove moisture, the clean waste gas is heated to 35-45 ℃ through a reheating device, wherein part of high-concentration CO is 2 The flue gas is induced to a carbon capture and purification device by a fan E, and the other part of high-concentration CO is 2 The flue gas is respectively sent to a first section of a second-section cooler, a kiln head burner and a kiln tail burner, and a quenching chamber A and a quenching chamber B of a bypass air release system through a fan F;
o produced by oxygen production system 2 Respectively spraying the mixture into a first section of a second-section cooler, a kiln head burner, a kiln door cover or a tertiary air pipe.
5. The method for producing cement by coupling oxy-fuel combustion with carbon capture as an alternative fuel according to claim 4, characterized in that: the waste heat power generation and treatment process of the second step comprises the following steps: waste heat power generation A is carried out or the temperature is reduced through a humidifying tower to the waste gas of going out the preheater, and the waste gas is cooled to below 200 ℃, and the waste gas gets into dust collector A behind high temperature fan and gathers dust, the amount of wind and the CO concentration of going out the preheater are controlled to high temperature fan, and dust concentration control is at 10mg/Nm in dust collector A export waste gas dust concentration 3 Then the waste gas enters a regenerative type incinerator, CO in the waste gas provides partial fuel for the waste gas, and harmful gas VOCs is burnt at high temperature to control the concentration of the VOCs to be 20mg/Nm 3 Then, the waste gas without VOCs and CO is cooled to 100 ℃ again through the waste heat power generation B or the water spraying device, and is desulfurized through the desulphurization device, SO that SO in the waste gas is removed 2 Emission control 35mg/Nm 3 The following.
6. The method for producing cement by coupling oxy-fuel combustion with carbon capture as an alternative fuel according to claim 4, characterized in that: the second step is followed by the following steps: a bypass air release process: drawing 5-30% volume percentage of flue gas out of the kiln from a smoke chamber, and blowing the high-concentration CO with the temperature of 35-45 ℃ obtained in the step two 2 Flue gas as cooling airThe flue gas enters a quenching bypass air release system of a quenching chamber A, then enters a dust collector B for dust collection, and the high-concentration CO with the temperature of 35-45 ℃ obtained in the step two is blown in again 2 The flue gas is used as cooling air to carry out quenching bypass air release on the flue gas of a quenching bypass air release system in a quenching chamber B, and the bypass air release high-concentration CO after secondary cooling 2 The temperature of the flue gas reaches 100-150 ℃, and the flue gas is discharged from a bypass air discharge system to be low-temperature high-concentration CO 2 O produced by the flue gas and the oxygen production system obtained in the step two 2 And the mixed air is used as cooling air and enters a first section of a second section cooler.
7. The method for producing cement by coupling oxy-fuel combustion with carbon capture as an alternative fuel according to claim 4, characterized in that: the second step is followed by the following steps: the two-stage cooler process comprises: a front roller type crusher resistant to about 850 ℃ is arranged, a partition wall is arranged at the position of the crusher to separate one section of a cooler from the two sections of the cooler, and a first section of a cooler blower is introduced into O produced by the oxygen production system in the first step 2 Cooling air from the bypass air bleeding system and high concentration CO from the air outlet machine F 2 Flue gas; and introducing air or part of waste gas from a fan D of the raw material grinding system into a two-stage blower of the cooler.
8. The method for producing cement by coupling oxy-fuel combustion with carbon capture as an alternative fuel according to claim 4, characterized in that: the second step is followed by the following steps: the cooler waste air heat recycling process comprises the following steps: after the residual air of the cooler goes to a raw material mill system for drying raw materials or is cooled by an air cooler, dust is removed by a dust collector, part of waste gas enters a second section of the second-section cooler, and the rest of waste gas is discharged into the atmosphere.
9. The method for producing cement by coupling oxy-fuel combustion with carbon capture as an alternative fuel according to claim 4, characterized in that: the feeding point and the blanking pipe for feeding the alternative fuel of the decomposing furnace are provided with air locking devices, so that O in the waste gas out of the preheater 2 The content is less than 2 percent, the CO content is 4000-9000ppm, and the dry basis of the flue gas is CO 2 Concentration is more than or equal to 80%, at the outlet of the preheaterThe air quantity is 1.3-1.4Nm 3 /kg.cl；
The preheater or the decomposing furnace is provided with a denitration device for enabling NO x Discharge to 100mg/Nm 3 The following;
alternative fuels are fed from a decomposition furnace in multiple layers, fuels with the grain sizes of 3D < -50mm, 2D < -200mm are arranged in the middle of the decomposition furnace, and fuels with the grain sizes of 3D < -5 mm and 2D < -50mm are arranged in the lower part of the decomposition furnace.
10. An air combustion and oxy-fuel combustion switchable cement production method, comprising the following steps:
when alternative fuel-air combustion methods are adopted: air is respectively sent to cooling air of a cooler, fuel air at the head and the tail of the kiln and cooling air of a bypass air discharge system through a fan;
when the alternative fuel oxy-fuel combustion coupled carbon capture method is adopted: removing most of water from the clean waste gas after waste heat power generation and environment-friendly waste gas treatment by cooling and condensing equipment to obtain dry-based CO of the flue gas 2 High concentration CO with concentration more than or equal to 80% 2 Heating the flue gas to 35-45 deg.C by reheater, wherein a part of high concentration CO is 2 The flue gas is induced to a carbon capture and purification device by a fan, and the other part of high-concentration CO 2 The flue gas is respectively sent to cooling air of a cooler, fuel air at the head and the tail of the kiln, cooling air of a bypass air release system and air used by equipment with easy air leakage of the system through a fan.
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|---|---|---|---|---|
| CN116105492A (en) * | 2023-04-12 | 2023-05-12 | 中材建设有限公司 | Carbon capture auxiliary system for cement production line and CO2 sealing method |
| CN116878264A (en) * | 2023-07-28 | 2023-10-13 | 中材建设有限公司 | Rotary kiln treatment system and method for clay minerals with low water content |
-
2022
- 2022-11-03 CN CN202211369382.6A patent/CN115654914A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116105492A (en) * | 2023-04-12 | 2023-05-12 | 中材建设有限公司 | Carbon capture auxiliary system for cement production line and CO2 sealing method |
| CN116105492B (en) * | 2023-04-12 | 2023-06-16 | 中材建设有限公司 | Carbon capture auxiliary system for cement production line and CO2 sealing method |
| WO2024041244A1 (en) * | 2023-04-12 | 2024-02-29 | 中材建设有限公司 | Carbon capture auxiliary system for cement production line and co2 sealing method |
| CN116878264A (en) * | 2023-07-28 | 2023-10-13 | 中材建设有限公司 | Rotary kiln treatment system and method for clay minerals with low water content |
| CN116878264B (en) * | 2023-07-28 | 2024-01-30 | 中材建设有限公司 | Rotary kiln treatment system and method for clay minerals with low water content and high water content |
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