Low-carbon production process and system of high belite cement clinker

Abstract

The application belongs to the technical field of low-carbon cement materials, and particularly relates to a low-carbon production process and system of high belite cement clinker, wherein the low-carbon production system comprises a raw material pretreatment module, a clinker firing module, a flue gas control module and a product detection module; in the application, traditional limestone and paper mill filter residue are used as calcium raw materials, coal cinder and coal gangue are used as aluminum / silicon raw materials, phosphogypsum is used to completely replace natural gypsum as sulfur raw material, copper residue is used to adjust iron material, and finally, calcium fluoride sludge is used to replace fluorite, so that the effective utilization of solid waste is improved, resources are saved, and the adverse effects of solid waste on the surrounding environment are reduced; in the calcination process, low-temperature staged calcination is adopted, the calcination temperature is controlled to be 1200-1300 DEG C, and staged temperature rising is adopted; compared with the traditional portland cement calcination temperature, the temperature is 50-100 DEG C lower, energy consumption and carbon dioxide emission are effectively saved, and the theme of energy saving and environmental protection is met.

Description

Technical Field

[0001] This invention belongs to the field of low-carbon cement materials technology, specifically a low-carbon production process and system for high-belite cement clinker. Background Technology

[0002] Currently, the main products on the market are general-purpose silicate cements, which are widely applicable but have similar performance and lack customized, more precise material solutions. High-belite cement, as a green alternative to traditional silicate cement, typically refers to high-performance, low-heat silicate cement. It is a new type of cement with dicalcium silicate (C2S) as its main mineral, offering significant advantages such as low heat of hydration, high later-stage strength, and low carbon emissions.

[0003] However, existing firing processes still suffer from problems such as high energy consumption, large carbon emissions, and reliance on natural resources. Furthermore, the flue gas generated during firing is at high temperatures and contains various pollutants, thus requiring targeted purification. Existing methods that combine SNCR denitrification with bag filters are prone to insufficient treatment of pollutants in the flue gas, poor cooling effect, difficulty in effectively recovering heat from the flue gas, and the need for frequent disassembly and cleaning. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a low-carbon production process and system for high-belite cement clinker.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention proposes a low-carbon production system for high belite cement clinker, including a raw meal pretreatment module, a clinker firing module, a flue gas control module and a product testing module. The flue gas control module includes a flue gas treatment duct and a flue gas online detection system. The flue gas treatment duct is arranged in the outer area of ​​the tail of the rotary kiln of the clinker firing module and is connected to the flue gas emission pipe of the rotary kiln. The flue gas treatment duct is vertically arranged from bottom to top with an air inlet zone, a purification zone, and an outlet zone. The air inlet zone has an air inlet on its side wall, and the purification zone has sealing plates on its upper and lower sides. The purification zone has evenly distributed air guide pipes, which are vertically arranged and connect the upper and lower air inlet and outlet zones. The outlet zone has an air outlet on its side wall. The area between the air guide pipes in the purification zone is filled with cooling water. The air guide pipes are connected to an external purification liquid supply system through a purification pipe. The atomized purification liquid is sent into the air guide pipes through the purification pipes to contact the upward flue gas and achieve denitrification and cooling treatment.

[0006] Preferably, the purification tube is located in the middle of the air guide tube and extends vertically downward to the bottom opening of the air guide tube. An inflation chamber is provided at the top of the air outlet area. The inflation chamber is connected to the purification liquid supply system. The top of the purification tube extends upward through the top opening of the air guide tube and into the inflation chamber. The purification tube is rotatably connected to the side wall of the inflation chamber. The side wall of the purification tube is uniformly provided with spray nozzles, which are connected to the inside of the air guide tube.

[0007] Preferably, the outer surface of the sidewall of the purification tube is symmetrically provided with arc-shaped guide protrusions, so that the overall cross-section of the purification tube is elliptical. The spray nozzle is located in the gap area between the guide protrusions, and the purification tube is connected to the rotating device on the sidewall of the air filling chamber.

[0008] Preferably, an annular separation net is provided inside the air guide tube at the part located outside the purification tube. The bottom of the separation net is connected to the inner wall of the air guide tube, and the top of the separation net is connected to the fixed pipe opening provided at the top of the air guide tube. An intercepting net is installed inside the air intake area, located above the air intake port. The limiting frame on the outside of the intercepting net is slidably connected to the inner wall of the air intake area.

[0009] Preferably, multiple sets of limiting blocks are evenly arranged on the outer surface of the separation net along the vertical direction. A set of limiting blocks at the same vertical height are circumferentially distributed around the central axis of the air guide pipe, and the ends of the limiting blocks are slidably embedded into the corresponding grooves provided on the inner wall of the air guide pipe, dividing the gap area between the inner wall of the air guide pipe and the separation net into various heating zones. A limiting rod is provided inside the groove, the bottom of the limiting rod is connected to the sliding bottom, and the top of the limiting rod slides through the limiting hole provided on the limiting block and is connected to the fixed pipe opening.

[0010] Preferably, the separating net includes a fixed part and an elastic part, which are staggered along the vertical direction. The fixed part is made of rigid metal, while the elastic part is made of elastic metal. The limiting blocks are distributed on the outer surface of the fixed part, and the cross-section of the elastic part is a continuously curved structure.

[0011] Preferably, a propulsion device is provided on the fixed pipe opening, the output end of the propulsion device is connected to the uppermost limiting block inside the air guide pipe, and the propulsion device is controlled by an external controller.

[0012] Preferably, a cleaning ring is fixedly connected to the inner ring of a group of limiting blocks at the same vertical height. The cleaning ring has a triangular cross-section, and the inner end of the cleaning ring points to the outer surface of the separation net.

[0013] A low-carbon production process for high-belite cement clinker, wherein the low-carbon production process utilizes the aforementioned low-carbon production system, and the specific steps of the low-carbon production process are as follows: S1, Raw material preparation and raw meal preparation: Using self-produced limestone and sandstone as raw materials, non-ferrous metal ash slag as iron corrective material, phosphogypsum and calcium fluoride sludge as composite mineralizer, the raw meal is mixed and ground according to the set ratio through an automated batching system, and finally the raw meal of the grinding number is tested to determine whether it meets the index. S2, Low-temperature calcination and clinker firing: Qualified raw materials are fed into a rotary kiln, and after transitioning to a new production line, they undergo calcination processing. The calcination temperature is controlled at 1200-1300℃, using a segmented heating method to stabilize the thermal regime within the kiln and avoid a reducing atmosphere. Rapid cooling using a grate cooler suppresses the crystal transformation of dicalcium silicate, resulting in highly active, low-carbon clinker. When all clinker indicators meet the control indicators for high-calcium silicate clinker, the clinker is transferred to the high-calcium silicate clinker silo. S3, High-Temperature Flue Gas Integrated Purification: The high-temperature flue gas flowing towards the tail of the rotary kiln enters the flue gas treatment flue. After preliminary filtration by the interceptor, it enters the purification zone. Then, it comes into contact with the purified airflow inside the array's air guide pipe, thereby removing harmful components from the high-temperature flue gas and controlling the temperature of the high-temperature flue gas to meet subsequent dust removal requirements. S4, Deep Purification and Standard Emission of Flue Gas: After cooling, the flue gas passes through the temperature detection zone. Once it meets the emission standards, the flue gas is discharged and introduced into a bag filter. The impurities in the flue gas are then deeply purified before being discharged. The discharge pipeline is equipped with an online flue gas detection system to ensure that the content of dust, acidic gases and nitrogen oxides in the flue gas remains stable within the emission standards.

[0014] The beneficial effects of this invention are as follows: The present invention discloses a low-carbon production process and system for high-belite cement clinker. In terms of raw materials, traditional limestone and paper mill filter residue (white mud) are used as calcareous raw materials, coal slag and coal gangue are used as aluminum / silica raw materials, phosphogypsum is used to completely replace natural gypsum as sulfurous raw materials, copper slag is used to adjust iron materials, and finally calcium fluoride sludge is used to replace fluorite. This effectively improves the utilization of solid waste, saves resources, and reduces the adverse impact of solid waste on the surrounding environment. In terms of calcination process, low-temperature segmented calcination is adopted, with the calcination temperature controlled at 1200-1300℃. Segmented heating is used (such as pre-calcination at 850-950℃ + main calcination at 1200-1300℃). Compared with the traditional silicate cement calcination temperature, it is 50-100℃ lower, which effectively saves energy consumption and carbon dioxide emissions, in line with the theme of energy conservation and environmental protection. For the flue gas generated during the calcination process, after being introduced into the flue gas treatment duct, the array of gas guide pipes and purification pipes are used to achieve uniform dispersion of the flue gas and full contact with the purified airflow, thereby removing harmful components in the high-temperature flue gas and recovering the heat of the high-temperature flue gas to meet the subsequent dust removal requirements. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a flowchart of the low-carbon production method in this invention; Figure 2 This is a perspective view of the flue gas treatment duct in this invention; Figure 3 This is a cross-sectional view of the flue gas treatment duct in this invention; Figure 4 yes Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a cross-sectional view of the air delivery tube in this invention; Figure 6 This is a perspective view of the limiting block and the cleaning ring in this invention.

[0017] In the diagram: flue gas treatment duct 1, air inlet zone 11, air inlet 111, purification zone 12, air outlet zone 13, air filling chamber 131, air outlet 132, air guide pipe 14, chute 141, heating zone 142, limiting rod 143, purification pipe 15, blowing nozzle 151, guide protrusion 152, separation net 16, fixed pipe opening 161, limiting block 162, limiting hole 163, fixing part 164, elastic part 165, propulsion device 166, cleaning ring 167, interception net 17, limiting frame 171. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: As shown in the attached diagram of the instruction manual. Figure 2-6 As shown, this application proposes a low-carbon production system for high-belite cement clinker. The low-carbon production system for high-belite cement clinker includes a raw meal pretreatment module, a clinker firing module, a flue gas control module, and a product testing module. The flue gas control module includes a flue gas treatment duct 1 and a flue gas online detection system. The flue gas treatment duct 1 is arranged in the outer area of ​​the tail of the rotary kiln in the clinker firing module and is connected to the flue gas emission pipe of the rotary kiln. The flue gas treatment duct 1 is vertically arranged from bottom to top with an inlet zone 11, a purification zone 12, and an outlet zone 13. The inlet zone 11 has an inlet 111 on its side wall. The purification zone 12 has sealing plates on its upper and lower sides. The purification zone 12 has evenly distributed air guide pipes 14, which are vertically arranged and connect the inlet zone 11 and the outlet zone 13 on its upper and lower sides. The outlet zone 13 has an outlet 132 on its side wall. The area between the air guide pipes 14 in the purification zone 12 is filled with cooling water. The purification zone 12 has an inlet water pipe and an outlet water pipe on its two sides, which are connected to the external cooling water recycling system. Cold water is sent into the purification zone 12, and then heated hot water is output for utilization, so as to make full use of the heat in the exhaust gas and reduce energy consumption. The air duct 14 is connected to the external purification liquid supply system through the purification pipe 15. The atomized purification liquid is sent into the air duct 14 through the purification pipe 15 to contact the upward flue gas to achieve denitrification and cooling treatment. The purification liquid supply system includes a purification liquid storage tank, an atomizer and an air pump. The purification liquid is atomized and sent into the air inlet of the air pump, and then a purified airflow containing purification liquid water mist is sent into the purification pipe 15. The purification liquid includes various types, such as ammonia water purification liquid for nitrogen oxides.

[0020] Specific workflow: In the preparation of high belite cement clinker, various raw materials of high belite cement raw meal are prepared. The raw materials mainly include self-produced limestone, self-produced sandstone, non-ferrous metal ash slag, phosphogypsum and calcium fluoride sludge, etc. The raw meal mill in the raw meal pretreatment module is used to grind and process the above raw materials until the fineness of the raw materials meets the processing standards. Then, the processed raw materials are prepared according to the proportion through the existing automated batching system and sent into the clinker firing module for firing. Considering the narrow firing range, fine particle size, and low free calcium control of high-belite cement clinker, this application chooses to use a rotary kiln to enhance operation, stabilize operation, control clinker particle uniformity, ensure that all indicators meet the requirements, and output the fired clinker after processing. For the finished fired clinker, manual sampling is performed, and X-ray fluorescence detection, chemical analysis, and other detection methods and related testing instruments in the product testing module are used to analyze the various indicators of the clinker. After meeting the standard requirements, the clinker can be sent to the storage warehouse for later use. To address the flue gas generated during the firing process, the kiln tail flue of the rotary kiln is connected to the flue gas treatment flue 1, allowing the high-temperature flue gas generated during firing to flow into the flue gas treatment flue 1 and then upward into the purification zone 12. Because the gas guide pipes 14 are evenly arrayed in the purification zone 12, the upward flue gas is dispersed into multiple streams that flow into the gas guide pipes 14 in sequence. The purification liquid supply system is activated to atomize the stored purification liquid and send it into the purification pipe 15 through a pump. Then, the purification pipe 15 sends the purified airflow into the gas guide pipe 14. The upward flue gas and the downward purified airflow collide and contact each other. The purification liquid can be prepared by diluting with ammonia water. The ammonia water component comes into contact with the nitrogen and oxygen components in the flue gas and is purified under high temperature. Furthermore, the ammonia component in the purified airflow can neutralize the hydrogen fluoride component in the flue gas upon contact, removing harmful substances such as hydrogen fluoride and effectively purifying the flue gas. Additionally, the flue gas impacts the purified airflow within the narrow duct 14, ensuring more thorough contact. On one hand, the moisture in the purified airflow absorbs heat through evaporation, cooling the high-temperature flue gas. On the other hand, the high-temperature and corrosion-resistant metal sidewalls of the duct 14 allow heat from the high-temperature flue gas to be transferred to the cooling water between the ducts in the purification zone 12. This further purifies the high-temperature flue gas while simultaneously recovering its heat. The increased cooling water temperature allows for resource utilization of the hot water and generated high-temperature steam, reducing energy consumption. Furthermore, when the purified and cooled flue gas is sent to the outlet zone 13, a temperature sensor is installed to detect whether the flue gas temperature has reached a predetermined value. When the temperature is lower than the safe value, it can be discharged from the outlet 132 and sent to the bag filter to filter and purify the dust and impurities in the flue gas, thereby reducing the adverse impact on the surrounding environment during the subsequent emission of flue gas. The pre-cooling during the purification process can reduce the flue gas temperature to a safe range acceptable to the bag filter, avoiding the bag burning situation due to excessively high flue gas temperature during the operation of the bag filter. Finally, an online flue gas detection system is installed at the flue gas emission location, including sensors for detecting pollutants such as hydrogen fluoride, nitrogen oxides, carbon dioxide, and particulate impurities. This system can determine whether the content of these pollutants in the final emitted flue gas is within the allowable emission range. If any abnormality occurs, the emission should be stopped immediately and an investigation should be conducted.

[0021] Example 2: Based on Embodiment 1, the purification pipe 15 is located in the middle of the air guide pipe 14 and extends vertically downward to the bottom opening of the air guide pipe 14. The top of the air outlet area 13 is provided with an inflation chamber 131, which is connected to the purification liquid supply system. The top of the purification pipe 15 extends upward through the top opening of the air guide pipe 14 and into the interior of the inflation chamber 131. The purification pipe 15 is rotatably connected to the side wall of the inflation chamber 131. The side wall of the purification pipe 15 is uniformly provided with spray nozzles 151, which are connected to the interior of the air guide pipe 14.

[0022] Specific workflow: Based on the specific workflow in Example 1, in order to improve the contact between the purified airflow and the flue gas, a purification pipe 15 is set to extend into the air guide pipe 14 and be located in the middle of the air guide pipe 14, so that the purification pipe 15 is surrounded by the upward flue gas. Then, the purification liquid supply system is activated to send the purified airflow into the purification pipe 15, and then it flows out from the evenly distributed nozzles 151 on the side wall of the purification pipe 15. This allows the purified airflow to be evenly distributed in different areas of the vertical direction inside the air guide pipe 14 and to fully contact the vertically upward flue gas. This allows the flue gas flowing inside the air guide pipe 14 to be impacted by the purified airflow released from the inside out by the purification pipe 15 which is surrounded in the middle. This is conducive to the full mixing of flue gas and purified airflow, promoting the combination and purification of harmful components in the flue gas with the purified airflow, and also promoting the flue gas to cool down faster.

[0023] Example 3: Based on Embodiment 2, the outer surface of the sidewall of the purification tube 15 is symmetrically provided with arc-shaped guide protrusions 152, so that the overall cross-section of the purification tube 15 is elliptical. The nozzle 151 is located in the gap area between the guide protrusions 152. The purification tube 15 is connected to the rotating device on the sidewall of the inflation chamber 131. Regarding the specific method of controlling the rotation of the purification tube 15, a rotating device is provided at the rotating connection part of the sidewall of the inflation chamber 131, including a drive motor. A drive gear is provided on the output end of the drive motor. The drive gear meshes with the ring gear on the outer surface of the purification tube 15 to indirectly drive the rotation of the purification tube 15 without affecting the introduction of purified airflow from the inflation chamber 131. An annular separation net 16 is provided inside the air duct 14 at the part outside the purification pipe 15. The bottom of the separation net 16 is connected to the inner wall of the air duct 14, and the top of the separation net 16 is connected to the fixed pipe port 161 provided at the top opening of the air duct 14. An intercepting net 17 is provided inside the air intake area 11, located above the air intake 111. The limiting frame 171 on the outside of the intercepting net 17 is slidably connected to the inner wall of the air intake area 11, and the limiting frame 171 can be pulled out to the outside. Specific workflow: Based on the specific workflow in Example 2, by setting the flow guide protrusion 152, the cross-section of the purification tube 15 is made to be elliptical. The end of the flow guide protrusion 152 is close to the separation net 16 set on the inner wall of the air guide tube 14, and a gap is maintained between it and the surface of the separation net 16. This makes the distance between different parts of the surface of the purification tube 15 and the inner wall of the air guide tube 14 in the horizontal direction different, and this difference presents a continuous curve change. The separation mesh 16 surrounds the purification pipe 15 and maintains a gap with the inner wall of the air guide pipe 14. This allows the flue gas to penetrate the separation mesh 16 to remove large particles of dust and impurities before contacting the inner wall of the air guide pipe 14. This reduces the adhesion of dust and impurities to the inner wall of the air guide pipe 14, thereby reducing the adverse effects of these adherents during heat conduction. Furthermore, because the separation mesh 16 is made of metal and is surrounded by flue gas, it can better transfer heat to the inner wall of the connected air guide pipe 14 and then to the cooling water on the outside, improving the heat conduction efficiency of the flue gas and the cooling efficiency of the flue gas. The rotating device indirectly connected to the end of the control purification pipe 15 is started, causing the purification pipe 15 to rotate in the middle part inside the air guide pipe 14. This causes the mixed airflow of flue gas and purified airflow inside the air guide pipe 14 to rotate as well, and under the centrifugal force, it permeates outward through the separation net 16 and enters the contact gap area between the separation net 16 and the inner wall of the air guide pipe 14, accelerating the transfer of heat through the side wall of the air guide pipe 14 to the cooling water on the outside. In addition, the rotation process accelerates the horizontal flow of the mixed airflow, so that the purified airflow and flue gas in the mixed airflow are fully combined, improving the purification efficiency. On the other hand, because the cross-section of the purification pipe 15 is elliptical, as the mixed airflow rotates, when the mixed airflow passes through the gap between the guide protrusion 152 and the separation net 16, it is pressurized and accelerated to scour the surface of the separation net 16 due to the small gap, and penetrates into the contact gap area on the outside of the separation net 16. As the mixed airflow moves to the gap between the middle area of ​​the guide protrusion 152 and the separation net 16, the gap is larger, and the mixed airflow is no longer pressurized. It returns from the contact gap area to the area surrounded by the separation net 16. This process is repeated, and the mixed airflow experiences continuous pressure changes during rotation and repeatedly passes through both sides of the separation net 16. This can enhance the degree of purification of the purified airflow and the flue gas, and also prevent dust and impurities in the flue gas from being too rich in the separation net 16, affecting the passability of the separation net 16. Furthermore, by setting a sliding limit frame 171 and an interceptor net 17, the flue gas flowing into the intake zone 11 is initially filtered, so that larger and more adhesive particulate impurities are separated onto the lower surface of the interceptor net 17, reducing the adhesion inside the air guide pipe 14. During the rest period after the clinker firing process, in order to clean and purify the impurities accumulated inside the separation net 16 and the air guide pipe 14, a cleaning process can be initiated. First, close the air inlet (111) and the air outlet (132), remove the interceptor net 17 and replace and clean its lower surface, then allow the purified airflow to pass through normally, and connect the recovery air pipe to the lower side of the interceptor net 17 so that the purified airflow flows downward to flush the separation net 16 and the air guide pipe 14 before penetrating the interceptor net 17 and flowing to the outside through the recovery air pipe. In this way, the dust and impurities cleaned by flushing the inner wall of the separation net 16 and the air guide pipe 14 fall into the air inlet area 11 due to the impact and are located on the upper side of the interceptor net 17. After cleaning for a period of time, the limit frame 171 can be removed and the interceptor net 17 can be replaced and cleaned to ensure that the interceptor net 17 functions properly. Effective cleaning of the inner wall of the separation net 16 and the air guide pipe 14 can also ensure the smooth progress of subsequent flue gas purification operations.

[0024] Example 4: Based on Embodiment 3, multiple sets of limiting blocks 162 are uniformly arranged on the outer surface of the separation net 16 along the vertical direction. A set of limiting blocks 162 at the same vertical height are circumferentially distributed around the central axis of the air guide pipe 14, and the ends of the limiting blocks 162 slide into the corresponding grooves 141 provided on the inner wall of the air guide pipe 14, dividing the gap area between the inner wall of the air guide pipe 14 and the separation net 16 into various heating zones 142. A limiting rod 143 is provided inside the groove 141. The bottom of the limiting rod 143 is connected to the sliding bottom, and the top of the limiting rod 143 slides through the limiting hole 163 provided on the limiting block 162 and is connected to the fixed pipe opening 161.

[0025] Specific workflow: Based on the specific workflow in Example 3, the contact gap area between the separation net 16 and the air guide pipe 14 is divided into multiple heating zones 142 by the ring-shaped limiting blocks 162, which prevent the exchange of mixed airflow between the heating zones 142 in the contact gap area. In the cleaning process, as the purification pipe 15 rotates, when the guide protrusion 152 rotates closer to the heating zone 142, due to the small gap, part of the pressurized mixed airflow is squeezed through the separation net 16 and enters the interior of the heating zone 142. On the other hand, it accelerates through the gap between the surface of the guide protrusion 152 and the separation net 16, causing the inner surface of the separation net 16 to be laterally washed away, thereby removing the dust and impurities adhering to the surface of the separation net 16 and ensuring the passability of the separation net 16. As the purification pipe 15 continues to rotate, when the guide protrusion 152 rotates away from the heating zone 142, the gap area increases and the pressure decreases. The mixed airflow that was originally forced into the heating zone 142 flows back to the area surrounded by the separation net 16. The reverse washing can wash and clean the surface of the separation net 16, accelerating the removal of dust and impurities adhering to the separation net 16.

[0026] Example 5: Based on Embodiment 4, the separating net 16 includes a fixing part 164 and an elastic part 165. The fixing part 164 and the elastic part 165 are staggered along the vertical direction. The fixing part 164 is made of rigid metal, while the elastic part 165 is made of elastic metal. The limiting block 162 is distributed on the outer surface of the fixing part 164. The cross section of the elastic part 165 is a continuous curved structure. A propulsion device 166 is provided on the fixed pipe port 161. The propulsion device 166 can be an electric telescopic device. The output end of the propulsion device 166 is connected to the uppermost limiting block 162 inside the air guide pipe 14, and the propulsion device 166 is controlled by an external controller. A cleaning ring 167 is fixedly connected to the top part of the inner ring of a set of limiting blocks 162 at the same vertical height. The cleaning ring 167 has a triangular cross section, and the inner end of the cleaning ring 167 points to the outer surface of the separation net 16. The upper and lower conical ends can scrape the inner wall surface of the air guide tube (14). Specific workflow: Based on the specific workflow in Example 4, in the cleaning process, to better remove the dust and impurities adhering to the separation net 16, the separation net 16 can be configured as a whole consisting of several fixed parts 164 and elastic parts 165 arranged alternately along the vertical direction. The continuously curved elastic parts 165 provide a large deformation margin for the overall deformation of the separation net 16. Thus, as the pushing device 166 starts and pulls the top of the separation net 16 and the limiting block 162, the separation net 16 as a whole is subjected to an upward pulling force and begins to elongate. During this process, the elastic parts... As the elastic part 165 is gradually stretched and elongated, the deformation causes the dirt and impurities adhering to the surface of the elastic part 165 to fall downwards. As the separation net 16 as a whole elongates upwards, the fixing part 164 also moves vertically upwards. The limiting block 162 connected to the fixing part 164 can only deform and move along the vertical movement trajectory due to the cooperation of the limiting rod 143 and the limiting hole 163. The deformation of the elastic part 165 relative to the fixing part 164 helps to peel off the layered impurities adhering to the surface of the separation net 16 due to the deformation and pulling action of different areas, causing the adhering dirt and impurities to fall downwards. Furthermore, the same set of limiting blocks 162 are connected in series through the annular cleaning ring 167 and move synchronously; the conical ends on the upper and lower sides of the cleaning ring 167 contact the inner wall of the air guide pipe 14, and the conical end of the cleaning ring 167 near the separation net 16 maintains a gap with the separation net 16. In this way, when the propulsion device 166 drives the cleaning ring 167 to move vertically back and forth, the conical ends on the upper and lower sides of the cleaning ring 167 scrape away the impurities adhering to the inner wall of the air guide pipe 14, and let them pass through the gap between the cleaning ring 167 and the separation net 16 under the action of airflow, and fall down onto the interception net 17. Similarly, the inclined surfaces on the upper and lower sides of the cleaning ring 167 guide the flue gas flowing upward along the heating zone 142 to backwash the outer surface of the separation net 16 when the flue gas flows vertically upward. When the separation net 16 needs to be cleaned, the purified airflow flows downward along the air guide pipe 14, and the purified airflow flowing downward in the heating zone 142 flows along the inclined surface on the upper side of the cleaning ring 167. While carrying away the impurities scraped off the inner wall of the air guide pipe 14 by the cleaning ring 167, it backwashes the separation net 16 from the outside to the inside. At the same time, the rotating purification pipe 15 squeezes the airflow in the area surrounded by the separation net 16 outward into the heating zone 142, washing the separation net 16 from the inside to the outside. This process is repeated to achieve full automatic cleaning of the separation net 16 and ensure the smooth progress of the subsequent flue gas cooling and purification process.

[0027] Example 6: Based on the above embodiments, as shown in the accompanying drawings of the specification. Figure 1 As shown, a low-carbon production process for high-belite cement clinker utilizes the aforementioned low-carbon production system. The specific steps of the low-carbon production process are as follows: S1, Raw material preparation and raw meal preparation: Using self-produced limestone and sandstone as raw materials, non-ferrous metal ash slag as iron corrective material, phosphogypsum and calcium fluoride sludge as composite mineralizer, the raw meal is mixed and ground according to the set ratio through an automated batching system, and finally the raw meal of the grinding number is tested to determine whether it meets the index. S2, Low-temperature calcination and clinker firing: Qualified raw materials are fed into a rotary kiln, and after transitioning to a new production line, they undergo calcination processing. The calcination temperature is controlled at 1200-1300℃, and a segmented heating method is used to stabilize the calcination environment inside the kiln. Rapid cooling using a grate cooler inhibits the crystal transformation of dicalcium silicate, resulting in highly active, low-carbon clinker. When all clinker indicators meet the control indicators for high-calcium silicate clinker, the clinker is transferred to the high-calcium silicate clinker silo. S3, High-temperature flue gas integrated purification: The high-temperature flue gas flowing towards the tail of the rotary kiln enters the flue gas treatment flue 1, and after preliminary filtration by the interceptor 17, it enters the purification zone 12. Then, it comes into contact with the purified airflow inside the array of air guide pipes 14, thereby removing harmful components in the high-temperature flue gas and controlling the temperature of the high-temperature flue gas to meet the subsequent dust removal requirements. S4, Deep purification and emission compliance of flue gas: After cooling, the flue gas passes through the temperature detection zone 13. Once it meets the emission standards, the flue gas is discharged and introduced into a bag filter. The impurities in the flue gas are then deeply purified before being discharged. The discharge pipeline is equipped with an online flue gas detection system to ensure that the content of dust, acidic gases and nitrogen oxides in the flue gas remains stable within the emission standards.

[0028] In summary, this application uses traditional limestone and paper mill filter residue (white mud) as calcareous raw materials, coal slag and coal gangue as aluminum / silica raw materials, phosphogypsum to completely replace natural gypsum as sulfurous raw materials, copper slag to adjust iron materials, and finally calcium fluoride sludge to replace fluorite. This effectively improves the utilization of solid waste, saves resources, and reduces the adverse impact of solid waste on the surrounding environment. In terms of calcination process, low-temperature segmented calcination is adopted, with the calcination temperature controlled at 1200-1300℃. Segmented heating is used (such as pre-calcination at 850-950℃ + main calcination at 1200-1300℃). Compared with the traditional silicate cement calcination temperature, it is 50-100℃ lower, which effectively saves energy consumption and carbon dioxide emissions, in line with the theme of energy conservation and environmental protection.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-carbon production system of high belite cement clinker, comprising a raw meal pretreatment module, a clinker firing module, a flue gas control module and a product detection module, characterized in that: The flue gas control module includes a flue gas treatment duct (1) and a flue gas online detection system. The flue gas treatment duct (1) is located in the outer area of ​​the tail of the rotary kiln of the clinker firing module and is connected to the flue gas emission pipe of the rotary kiln. The flue gas treatment flue (1) is provided with an air inlet (11), a purification zone (12) and an air outlet (13) in the vertical direction from bottom to top. The side wall of the air inlet (11) is provided with an air inlet (111), and the upper and lower sides of the purification zone (12) are provided with sealing plates. The purification zone (12) is evenly distributed with air guide pipes (14). The air guide pipes (14) are vertically arranged and connect the air inlet zone (11) and the air outlet zone (13) on the upper and lower sides. The side wall of the air outlet zone (13) is provided with an air outlet (132). The area inside the purification zone (12) located between the air guide pipes (14) is filled with cooling water. The air guide pipes (14) are connected to the external purification liquid supply system through the purification pipe (15). The atomized purification liquid is sent into the air guide pipes (14) through the purification pipe (15) and comes into contact with the upward flue gas to achieve denitrification and cooling treatment.

2. The low-carbon production system for high-belite cement clinker according to claim 1, characterized in that: The purification tube (15) is located in the middle of the air guide tube (14) and extends vertically downward to the bottom opening of the air guide tube (14). The top of the air outlet area (13) is provided with an inflation chamber (131), which is connected to the purification liquid supply system. The top of the purification tube (15) extends upward through the top opening of the air guide tube (14) and into the inflation chamber (131). The purification tube (15) is rotatably connected to the side wall of the inflation chamber (131). The side wall of the purification tube (15) is evenly provided with spray nozzles (151), which are connected to the inside of the air guide tube (14).

3. The low-carbon production system for high-belite cement clinker according to claim 2, characterized in that: The outer surface of the side wall of the purification pipe (15) is symmetrically provided with arc-shaped guide protrusions (152), so that the overall cross-section of the purification pipe (15) is elliptical. The nozzle (151) is located in the gap area between the guide protrusions (152). The purification pipe (15) is connected to the rotating device on the side wall of the air chamber (131).

4. A low-carbon production system for high-belite cement clinker according to claim 3, characterized in that: An annular separation net (16) is provided inside the air duct (14) at the part outside the purification pipe (15). The bottom of the separation net (16) is connected to the inner wall of the air duct (14), and the top of the separation net (16) is connected to the fixed pipe opening (161) provided at the top opening of the air duct (14). An intercepting net (17) is provided inside the air intake area (11) above the air intake port (111). The limiting frame (171) on the outside of the intercepting net (17) is slidably connected to the inner wall of the air intake area (11).

5. A low-carbon production system for high-belite cement clinker according to claim 4, characterized in that: Multiple sets of limiting blocks (162) are evenly arranged on the outer surface of the separation net (16) along the vertical direction. A set of limiting blocks (162) at the same vertical height are arranged in a circle around the central axis of the air guide pipe (14). The ends of the limiting blocks (162) slide into the corresponding grooves (141) provided on the inner wall of the air guide pipe (14), dividing the gap area between the inner wall of the air guide pipe (14) and the separation net (16) into various heating zones (142). A limiting rod (143) is provided inside the groove (141). The bottom of the limiting rod (143) is connected to the sliding bottom. The top of the limiting rod (143) slides through the limiting hole (163) provided on the limiting block (162) and is connected to the fixed pipe opening (161).

6. A low-carbon production system for high-belite cement clinker according to claim 5, characterized in that: The separation net (16) includes a fixed part (164) and an elastic part (165). The fixed part (164) and the elastic part (165) are staggered along the vertical direction. The fixed part (164) is made of rigid metal, while the elastic part (165) is made of elastic metal. The limiting block (162) is distributed on the outer surface of the fixed part (164). The cross section of the elastic part (165) is a continuous curved structure.

7. A low-carbon production system for high-belite cement clinker according to claim 6, characterized in that: A propulsion device (166) is provided on the fixed port (161). The output end of the propulsion device (166) is connected to the uppermost limiting block (162) inside the air guide pipe (14), and the propulsion device (166) is controlled by an external controller.

8. A low-carbon production system for high-belite cement clinker according to claim 7, characterized in that: A cleaning ring (167) is fixed to the inner ring of a set of limiting blocks (162) at the same vertical height. The cleaning ring (167) has a triangular cross-section and the inner end of the cleaning ring (167) points to the outer surface of the separation net (16).

9. A low-carbon production process for high-belite cement clinker, wherein the low-carbon production process utilizes the low-carbon production system described in any one of claims 1-8, characterized in that, The specific steps of the low-carbon production process are as follows: S1, Raw material preparation and raw meal preparation: Using self-produced limestone and sandstone as raw materials, non-ferrous metal ash slag as iron corrective material, phosphogypsum and calcium fluoride sludge as composite mineralizer, the raw meal is mixed and ground according to the set ratio through an automated batching system, and finally the raw meal of the grinding number is tested to determine whether it meets the index. S2, Low-temperature calcination and clinker firing: Qualified raw materials are fed into a rotary kiln, and after transitioning to a new production line, they undergo calcination processing. The calcination temperature is controlled at 1200-1300℃, and a segmented heating method is used to stabilize the calcination environment inside the kiln. Rapid cooling using a grate cooler inhibits the crystal transformation of dicalcium silicate, resulting in highly active, low-carbon clinker. When all clinker indicators meet the control indicators for high-calcium silicate clinker, the clinker is transferred to the high-calcium silicate clinker silo. S3, High-temperature flue gas integrated purification: The high-temperature flue gas flowing to the tail of the rotary kiln enters the flue gas treatment flue (1), and after the initial filtration by the interception net (17), it enters the purification zone (12). Then, it comes into contact with the purification water mist inside the array's air guide pipe (14), thereby removing harmful components in the high-temperature flue gas and controlling the temperature of the high-temperature flue gas to meet the subsequent dust removal requirements. S4, deep purification and emission compliance of flue gas: After the cooled flue gas passes through the temperature detection of the outlet zone (13), and meets the emission standards, the flue gas is discharged and introduced into the bag filter. The impurities in the flue gas are deeply purified and then discharged. The discharge pipeline is equipped with an online flue gas detection system to ensure that the content of dust, acidic gas and nitrogen oxides in the flue gas is stable within the emission standards.

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