Coal gangue distributed homogeneous high-temperature activation calcination method and system

Abstract

The invention discloses a coal gangue distributed homogeneous high-temperature activation calcination method and system, and relates to the technical field of resources and environments, the system comprises a coal gangue powder preparation and feeding system, a coal gangue powder distributed homogeneous high-temperature activation calcination system, a high-temperature powder cooling system, a finished product collection system and a flue gas purification system; the coal gangue powder distributed homogeneous high-temperature activation calcining system comprises a primary cyclone preheating system and a distributed homogeneous high-temperature activation furnace; the air inlet end of the primary cyclone preheating system is communicated with the coal gangue powder preparing and feeding system, the primary cyclone preheating system is communicated with the homogeneous high-temperature activation furnace, materials in the distributed homogeneous high-temperature activation furnace are separated by the gas-solid cyclone separator and then are divided into two parts by the distributor, one part enters the high-temperature powder cooling system, and the other part enters the high-temperature powder cooling system; and the other part returns to the distributed homogeneous high-temperature activation furnace for circulation. According to the method, large-scale treatment of high-temperature activation and calcination of the coal gangue is realized, and the uniformity and controllability of product quality are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of resources and environmental technology, and more specifically to a method and system for distributed homogeneous high-temperature activation calcination of coal gangue. Background Technology

[0002] Coal production generates a large amount of coal gangue byproducts, with huge historical legacies and new additions, causing serious environmental pollution. Effective treatment and rational utilization are the only way to solve the current coal gangue pollution problem.

[0003] Therefore, a high-temperature activation method with large-scale and controllable product quality is needed to realize the high-value application of coal gangue and support the sustainable development of coal gangue resource utilization.

[0004] Coal gangue is mainly a mixture of inorganic matter and a small amount of organic matter, with a highly fluctuating calorific value. Its mineral composition primarily includes quartz, kaolinite, illite, feldspar, pyrite, and carbonates. After high-temperature activation and calcination, coal gangue can be used as an active cementitious material, a raw material for ceramic aluminosilicates, a raw material for the alumina and fiberglass industries, and for producing high-whiteness metakaolin and mullite. Different applications place different demands on the high-temperature activation and calcination of coal gangue. Current high-temperature activation processes for coal gangue mainly include tunnel kiln calcination, rotary kiln calcination, belt roasting calcination, and suspension calcination. However, these processes still have significant drawbacks that restrict the comprehensive utilization of coal gangue, mainly including: 1) The low output of a single rotary kiln calcination unit and the high energy consumption of calcination result in poor economic efficiency. The inability to effectively adjust the temperature field as required leads to poor product quality uniformity, which restricts large-scale promotion and application.

[0005] 2) Belt roasting is used for blocky materials. The decarburization depth of the surface, middle layer and core of the material is not uniform, the product quality is unstable, and the subsequent application range is narrow, which restricts the large-scale promotion and application.

[0006] 3) Existing suspension calcination technology cannot adapt to the large fluctuations in the calorific value of coal gangue. The temperature field of the high-temperature calcination system is difficult to adjust, the system operating conditions are unstable, and the homogeneous calcination effect cannot be achieved. Therefore, the unstable product performance restricts the large-scale promotion and utilization.

[0007] Therefore, it is necessary to develop a new method for homogeneous high-temperature activation treatment of coal gangue to achieve large-scale processing of coal gangue through high-temperature activation and calcination, and to significantly improve the uniformity and controllability of product quality. Summary of the Invention

[0008] The purpose of this invention is to address the aforementioned technical problems by providing a distributed homogeneous high-temperature activation and calcination method and system for coal gangue. This method adapts to the differences in characteristics of coal gangue from different sources, achieving high-temperature activation treatment of coal gangue to meet subsequent utilization requirements.

[0009] To achieve the above objectives, the present invention specifically adopts the following technical solution: One aspect of the present invention provides a distributed homogeneous high-temperature activation and calcination system for coal gangue, comprising a coal gangue powder preparation and feeding system, a distributed homogeneous high-temperature activation and calcination system for coal gangue powder, a high-temperature powder cooling system, a finished product collection system, and a flue gas purification system. The distributed homogeneous high-temperature activation and calcination system for coal gangue powder includes a primary cyclone preheating system and a distributed homogeneous high-temperature activation furnace. The air inlet of the primary cyclone preheating system is connected to the coal gangue powder preparation and feeding system, and the primary cyclone preheating system is connected to the homogeneous high-temperature activation furnace. The material in the distributed homogeneous high-temperature activation furnace is separated by a gas-solid cyclone separator and then divided into two parts by a distributor. One part enters the high-temperature powder cooling system, and the other part returns to the distributed homogeneous high-temperature activation furnace for circulation. The discharge end of the high-temperature powder cooling system is connected to the product collection system, the air outlet end of the high-temperature powder cooling system is connected to the flue gas purification system through the coal gangue powder distributed homogeneous high-temperature activation and calcination system, and the air inlet end of the high-temperature powder cooling system is connected to the ambient air pipeline.

[0010] In one embodiment, the coal gangue powder preparation and feeding system includes a coal gangue pretreatment system and a coal gangue powder metering and conveying system connected in sequence. The coal gangue pretreatment system includes a coal gangue pre-homogenization stockpile, a coal gangue powder preparation system, and a coal gangue powder homogenization silo, arranged sequentially. The coal gangue powder metering and conveying system includes a metering system connected to the coal gangue powder homogenization silo and a conveying system connected to the metering system. The conveying system feeds the coal gangue powder distributed homogenization high-temperature activation and calcination system into the coal gangue powder through pneumatic conveying or mechanical conveying.

[0011] In one embodiment, the primary cyclone preheating system includes a first cyclone preheater, a second cyclone preheater, a third cyclone preheater, and a fourth cyclone preheater connected in series. The outlet of the first cyclone preheater is connected to the flue gas purification system, the inlet of the first cyclone preheater is connected to the outlet of the second cyclone preheater through a heat exchange tube, and the material outlet of the first cyclone preheater is connected to the heat exchange pipe between the second cyclone preheater and the third cyclone preheater through a first discharge pipe. The air inlet of the second cyclone preheater is connected to the air outlet of the third cyclone preheater through a heat exchange pipe. The discharge port of the second cyclone preheater is connected to a first distributor. The outlet of the first distributor is connected to a second discharge pipe and a third discharge pipe. The second discharge pipe is connected to the heat exchange pipe between the third cyclone preheater and the fourth cyclone preheater. The third discharge pipe is connected to the side wall of the distributed homogeneous high-temperature activation furnace. The air inlet of the third cyclone preheater and the air outlet of the fourth cyclone preheater are connected through a heat exchange pipe. The outlet of the third cyclone preheater is connected to a second distributor. The outlet of the second distributor is connected to a fourth discharge pipe and a fifth discharge pipe. The fourth discharge pipe and the fifth discharge pipe are respectively connected to the side wall of the distributed homogeneous high-temperature activation furnace. The distribution ratio of the fourth discharge pipe and the fifth discharge pipe can be adjusted between 0 and 100%. The air inlet of the fourth cyclone preheater is connected to the material outlet of the distributed homogeneous high-temperature activation furnace. The discharge port of the fourth cyclone preheater is connected to a third distributor. The outlet of the third distributor is connected to a sixth discharge pipe and a seventh discharge pipe. The sixth discharge pipe is connected to the high-temperature powder cooling system. The seventh discharge pipe is connected to the side wall of the distributed homogeneous high-temperature activation furnace. The material distribution ratio of the sixth discharge pipe and the seventh discharge pipe can be adjusted between 0 and 100%. The output end of the conveying system is divided into two pipelines. One pipeline is connected to the heat exchange pipeline between the second cyclone preheater and the third cyclone preheater; the other pipeline is connected to the heat exchange pipeline between the first cyclone preheater and the second cyclone preheater.

[0012] In one embodiment, the primary cyclone preheating system includes a second cyclone preheater, a third cyclone preheater, and a fourth cyclone preheater connected in series. The outlet of the second cyclone preheater is connected to the flue gas purification system. The inlet of the second cyclone preheater is connected to the outlet of the third cyclone preheater through a heat exchange pipe. The outlet of the second cyclone preheater is connected to a first distributor. The outlet of the first distributor is connected to a second discharge pipe and a third discharge pipe. The second discharge pipe is connected to the heat exchange pipe between the third cyclone preheater and the fourth cyclone preheater. The third discharge pipe is connected to the side wall of the distributed homogeneous high-temperature activation furnace. The air inlet of the third cyclone preheater and the air outlet of the fourth cyclone preheater are connected through a heat exchange pipe. The outlet of the third cyclone preheater is connected to a second distributor. The outlet of the second distributor is connected to a fourth discharge pipe and a fifth discharge pipe. The fourth discharge pipe and the fifth discharge pipe are respectively connected to the side wall of the distributed homogeneous high-temperature activation furnace. The distribution ratio of the fourth discharge pipe and the fifth discharge pipe can be adjusted between 0 and 100%. The air inlet of the fourth cyclone preheater is connected to the material outlet of the distributed homogeneous high-temperature activation furnace. The discharge port of the fourth cyclone preheater is connected to a third distributor. The outlet of the third distributor is connected to a sixth discharge pipe and a seventh discharge pipe. The sixth discharge pipe is connected to the high-temperature powder cooling system. The seventh discharge pipe is connected to the side wall of the distributed homogeneous high-temperature activation furnace. The material distribution ratio of the sixth discharge pipe and the seventh discharge pipe can be adjusted between 0 and 100%. The output end of the conveying system is connected to the heat exchange pipeline between the second cyclone preheater and the third cyclone preheater via a pipeline.

[0013] In one embodiment, the high-temperature powder cooling system includes an initial cooling section and a final cooling section, wherein the initial cooling section has ≥1 cyclone cooler stage and the final cooling section has ≥0 cyclone cooler stages.

[0014] In one embodiment, the primary cooling section includes a first cyclone cooler and a second cyclone cooler; The final cooling section includes a third cyclone cooler; The air inlet of the third cyclone cooler is connected to the third cooling pipe, and the discharge outlet of the third cyclone cooler is connected to the finished product collection system through a pipe. The air inlet of the second cyclone cooler is connected to the first cooling pipe, the air outlet of the second cyclone cooler is connected to the air inlet of the first cyclone cooler through the second cooling pipe, and the discharge outlet of the second cyclone cooler is connected to the third cooling pipe of the third cyclone cooler through the ninth discharge pipe. The outlet of the first cyclone cooler is connected to the inlet of the distributed homogeneous high-temperature activation furnace, and the outlet of the first cyclone cooler is connected to the first cooling pipe through the eighth feeding pipe.

[0015] In one embodiment, the initial cooling section includes a first cyclone cooler; the final cooling section includes a third cyclone cooler. The air inlet of the third cyclone cooler is connected to the third cooling pipe, and the discharge outlet of the third cyclone cooler is connected to the finished product collection system through a pipe. The air inlet of the first cyclone cooler is connected to the second cooling pipe, the air outlet of the first cyclone cooler is connected to the air inlet of the distributed homogeneous high-temperature activation furnace, and the material outlet of the first cyclone cooler is connected to the first cooling pipe through the eighth material discharge pipe.

[0016] In one embodiment, the finished product collection system includes a finished product collection and conveying device and a bag filter dust collector connected to the outlet of the third cyclone cooler. A cooling fan is installed on the air outlet pipe of the bag dust collector, and the material outlet pipe of the bag dust collector is connected to the finished product collection and conveying device.

[0017] In one embodiment, the flue gas purification system includes a primary boiler, a nitrogen oxide purification device, a secondary boiler, a system fan, a dust removal and purification system, a booster fan, and a sulfur dioxide purification system.

[0018] A second aspect of the present invention provides a distributed homogeneous high-temperature activation calcination method for coal gangue, employing the aforementioned distributed homogeneous high-temperature activation calcination system for coal gangue, comprising the following steps: S1. Coal Gangue Pretreatment System: During operation, incoming coal gangue is crushed and then enters the coal gangue pre-homogenization stockpile for the first stage of homogenization. After homogenization, the material enters the coal gangue powder preparation system, where the grinding fineness (40~1000 mesh) is controlled according to the particle size requirements of the final product. Simultaneously, a second homogenization is completed during the grinding process. After grinding, the material enters the coal gangue powder homogenization silo for further homogenization. Through the above comprehensive pretreatment, the standard deviation of the main oxides (alumina, silicon dioxide) is controlled within ±0.5%. S2. Coal gangue powder conveying and feeding: After pretreatment, the coal gangue powder is metered by the metering system and then fed into the coal gangue distributed homogeneous high-temperature activation calcination system. The feeding method is either pneumatic conveying followed by injection or mechanical conveying followed by feeding. S3, Distributed homogeneous high-temperature activation and calcination treatment of coal gangue: S31. Primary preheating treatment: The material enters the primary preheating cyclone system through the feeding point. Using the high-temperature flue gas of the distributed homogeneous high-temperature activation furnace as the heat source, it completes the step-by-step preheating and temperature rise, enters the dehydration stage, and after partial dehydration, it enters the distributed homogeneous high-temperature activation furnace. The flue gas after heat exchange enters the subsequent flue gas treatment system. S32. Homogeneous high-temperature activation: Centered on a distributed homogeneous high-temperature activation furnace with distributed feeding and fuel cascade replenishment functions, materials after primary preheating are fed into the distributed homogeneous high-temperature activation furnace at multiple points to avoid overburning caused by concentrated heat release from coal gangue within the furnace. When the coal gangue has low heat and cannot maintain the furnace temperature, fuel is replenished in stages to maintain a stable temperature field within the furnace. After completing deep heat treatment processes such as decarbonization, dehydroxylation, and desulfurization within the furnace, gas-solid separation is achieved through a cyclone separator. High-temperature flue gas enters the primary cyclone preheating system, while high-temperature materials enter the subsequent circulating calcination system and high-temperature powder cooling system.

[0019] S33. Circulating calcination treatment: The material exiting the distributed homogeneous high-temperature activation furnace is separated by a gas-solid cyclone separator and then divided into two parts by a distributor. One part enters the subsequent high-temperature powder cooling system, and the other part returns to the distributed homogeneous high-temperature activation furnace for circulation. S4. High-temperature powder cooling treatment: Ambient air is used as the heat exchange medium. The amount of cooling air is determined by the system fan. After heat exchange, the high-temperature air enters the distributed homogeneous high-temperature activation furnace as combustion air and suspension medium to complete the cooling of high-temperature powder and the recovery of sensible heat. The powder after preliminary cooling enters the terminal cooling system. The cooled material and air enter the finished product collection system and the dust-containing gas purification system, respectively.

[0020] S5. Flue gas purification treatment: The high-temperature flue gas in the coal gangue high-temperature activation and calcination system contains pollutants such as dust, sulfur dioxide, and nitrogen oxides. Under the action of the system fan, the flue gas passes through the primary boiler, the nitrogen oxide purification device, and the secondary boiler in sequence to complete the primary cooling, nitrogen oxide purification, and secondary cooling of the flue gas, thereby controlling the air temperature of the system fan to 180~200℃. Under the action of the booster fan, the flue gas at the outlet of the system fan enters the dust removal and purification device. After the dust is purified, the flue gas enters the sulfur dioxide purification system, and the purified flue gas is discharged in compliance with standards.

[0021] The beneficial effects of this invention are as follows: The advantages and positive effects of this invention are as follows: 1. This invention makes full use of the cyclone heat exchange gas-solid separation system to achieve full utilization of heat. In the primary preheating stage, it realizes heat recovery of high-temperature flue gas and completes the primary heat treatment of coal gangue. In the high-temperature powder cooling stage, it completes the cooling of high-temperature powder and recovers the sensible heat of high-temperature powder, providing high-temperature combustion air and suspension medium for the distributed homogeneous high-temperature activation calcining furnace.

[0022] 2. This invention fully utilizes a distributed feeding method, achieving variability in the actual number of preheater stages through multi-point feeding and material distribution. Taking a four-stage preheater as an example, the actual number of heat exchange cycles can be flexibly adjusted between 1 and 3 times according to fluctuations in the properties of the coal gangue, realizing the adaptability of a single device to changes in the characteristics of coal gangue. For coal gangue with low calorific value and volatile matter content, it can operate without material distribution, fully preheating and recovering heat from high-temperature flue gas; for coal gangue with high calorific value and volatile matter content, the actual number of preheating cycles can be adjusted by adjusting the feeding points and material distribution methods, avoiding premature large-scale combustion of coal gangue in the preheater and causing system malfunctions.

[0023] 3. The distributed feeding method of this invention changes the traditional feeding method. Based on the combustion characteristics of coal gangue, the coal gangue is dispersed in different areas and fed into the distributed homogeneous high-temperature activation furnace, avoiding the high-temperature activation failure caused by overburning phenomena such as passivation of powder surface due to concentrated heat release.

[0024] 4. The step-by-step fuel replenishment method of the present invention maintains the stability of the temperature field inside the high-temperature activation calcining furnace based on the combustion characteristics of coal gangue powder and fuel, avoids uncontrollable changes in the temperature field, and promotes the stability of the high-temperature activation process.

[0025] 5. The present invention further enhances the effect of high-temperature activation by using a method of partial circulation of materials in the high-temperature activation furnace after gas-solid separation, while reducing the overall heat intensity of the high-temperature activation furnace and saving energy.

[0026] 6. This invention adopts a method of connecting high-temperature powder cooling with a distributed homogeneous high-temperature activation furnace, which simplifies the system process and realizes the integration of primary preheating, distributed homogeneous high-temperature activation and cooling system, thereby improving the system's thermal utilization rate while completing high-temperature activation.

[0027] 7. The distributed homogeneous high-temperature activation method for coal gangue of the present invention can control the loss on ignition of coal gangue within the range of ≤0.2%. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a distributed homogeneous high-temperature activation and calcination system for coal gangue in Example 1; Figure 2This is a partially enlarged view of the coal gangue powder preparation and feeding system; Figure 3 yes Figure 1 A partially enlarged view of one implementation structure of a distributed homogeneous high-temperature activation and calcination system for coal gangue powder; Figure 4 yes Figure 1 A partial enlarged view of a medium-to-high temperature powder cooling system; Figure 5 yes Figure 1 A close-up view of the intermediate product collection system; Figure 6 yes Figure 1 A partial enlarged view of the flue gas purification system; Figure 7 This is a schematic diagram of the structure of a distributed homogeneous high-temperature activation and calcination system for coal gangue in Example 2; Figure 8 yes Figure 7 A partially enlarged view of the distributed homogeneous high-temperature activation and calcination system for coal gangue powder; Figure 9 yes Figure 7 A partial enlarged view of a medium-to-high temperature powder cooling system; Reference numerals: 1. First distributor; 2. Second distributor; 3. Third distributor; 4. Distributed homogenizing high-temperature activation furnace; C1, First cyclone preheater; C2, Second cyclone preheater; C3, Third cyclone preheater; C4, Fourth cyclone preheater; C5, First cyclone cooler; C6, Second cyclone cooler; C7, Third cyclone cooler; F1, First feeding pipe; F2, Second feeding pipe; F3, Third feeding pipe; F4, Fourth feeding pipe; F5, Fifth feeding pipe; F6, Sixth feeding pipe; F7, Seventh feeding pipe; F8, Eighth feeding pipe; F9, Ninth feeding pipe. Detailed Implementation

[0030] To make the technical problems, technical solutions, and technical effects of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0034] Example 1 like Figures 1 to 6 As shown, this embodiment provides a distributed homogeneous high-temperature activation and calcination system for coal gangue, including a coal gangue powder preparation and feeding system, a distributed homogeneous high-temperature activation and calcination system for coal gangue powder, a high-temperature powder cooling system, a finished product collection system, and a flue gas purification system. The distributed homogeneous high-temperature activation and calcination system for coal gangue powder includes a primary cyclone preheating system and a distributed homogeneous high-temperature activation furnace 4. The air inlet of the primary cyclone preheating system is connected to the coal gangue powder preparation and feeding system, and the primary cyclone preheating system is connected to the homogeneous high-temperature activation furnace. The material in the distributed homogeneous high-temperature activation furnace 4 is separated by a gas-solid cyclone separator and then divided into two parts by a distributor. One part enters the high-temperature powder cooling system, and the other part returns to the distributed homogeneous high-temperature activation furnace 4 for circulation. The discharge end of the high-temperature powder cooling system is connected to the finished product collection system, the air outlet end of the high-temperature powder cooling system is connected to the flue gas purification system through the distributed homogeneous high-temperature activation and calcination system for coal gangue powder, and the air inlet end of the high-temperature powder cooling system is connected to the ambient air pipeline.

[0035] like Figure 2 As shown, the coal gangue powder preparation and feeding system includes a coal gangue pretreatment system and a coal gangue powder metering and conveying system connected in sequence. The coal gangue pretreatment system includes a coal gangue pre-homogenization stockpile, a coal gangue powder preparation system, and a coal gangue powder homogenization silo, which are arranged in sequence. The coal gangue powder metering and conveying system includes a metering system connected to the coal gangue powder homogenization silo and a conveying system connected to the metering system. The conveying system feeds the coal gangue powder into the distributed homogenized high-temperature activation and calcination system via pneumatic conveying or mechanical conveying.

[0036] The qualified coal gangue entering the site undergoes preliminary homogenization in the coal gangue pre-homogenization stockpile. After pre-homogenization, the coal gangue is metered and then enters the coal gangue grinding system. The fineness of the ground material is 200-400 mesh, and it is further homogenized during the grinding process. The ground material is stored in the coal gangue powder homogenization silo, and is homogenized again during the silo entry and exit processes. The material exiting the silo is fed into the coal gangue powder distributed homogenization heat treatment system through the coal gangue powder metering and conveying system.

[0037] like Figure 3 As shown, the main body of the coal gangue distributed homogeneous high-temperature activation and calcination system consists of a cyclone preheater composed of a first cyclone preheater C1, a second cyclone preheater C2, a third cyclone preheater C3, and a fourth cyclone preheater C4, as well as a distributed homogeneous high-temperature activation furnace 4.

[0038] After being metered, the coal gangue powder is transported to the heat treatment system and fed into the heat exchange tube between the first cyclone preheater C1 and the second cyclone preheater C2 through the first feeding point. The flue gas flows from the second cyclone preheater C2 to the first cyclone preheater C1. After gas-solid heat exchange, it enters the first cyclone preheater C1 and completes gas-solid separation. The separated high-temperature flue gas enters the flue gas purification system, while the solid powder enters the heat exchange tube between the third cyclone preheater C3 and the second cyclone preheater C2 through the first discharge pipe F1.

[0039] In the heat exchange tube between the third cyclone preheater C3 and the second cyclone preheater C2, the flue gas flows from the third cyclone preheater C3 to the second cyclone preheater C2. After gas-solid heat exchange, it enters the second cyclone preheater C2 and completes gas-solid separation. The separated high-temperature flue gas enters the heat exchange tube between the first cyclone preheater C1 and the second cyclone preheater C2. The solid powder enters the heat exchange tube between the third cyclone preheater C3 and the fourth cyclone preheater C4 in sequence through the C2-1 feed pipe, the first distributor 1, and the second feed pipe F2.

[0040] In the heat exchange tube between the third cyclone preheater C3 and the fourth cyclone preheater C4, the flue gas flows from the fourth cyclone preheater C4 to the third cyclone preheater C3. After gas-solid heat exchange, it enters the third cyclone preheater C3 and completes gas-solid separation. The separated high-temperature flue gas enters the heat exchange tube between the third cyclone preheater C3 and the second cyclone preheater C2. The solid powder enters the second distributor 2 through the C3-1 feed pipe. Under the action of the second distributor 2, the powder is divided into two paths and enters the first furnace inlet point and the third furnace inlet point through the fourth feed pipe F4 and the fifth feed pipe F5, respectively. The ratio of the two feed paths can be adjusted arbitrarily between 0 and 100%.

[0041] In the distributed homogeneous high-temperature activation calcining furnace, the material enters the furnace through a distributed feeding system consisting of a first, second, third, and fourth inlet point. High-temperature combustion air enters from the bottom of the furnace via the first cyclone cooler C5. Supplemental heat is provided by a distributed combustion supply system consisting of a first, second, and third burner (through distributed multi-point feeding and supplementary combustion, with ≥2 feeding points and ≥2 supplementary combustion points). In the distributed homogeneous high-temperature activation furnace 4, the flue gas temperature is ≥800℃. After homogeneous high-temperature activation and calcination, the gas enters the fourth cyclone preheater C4 and undergoes gas-solid separation. The high-temperature flue gas then enters the heat exchange tube between the fourth cyclone preheater C4 and the third cyclone preheater C3. The solid powder enters the third distributor 3 through the C4-1 feed pipe. Under the action of the third distributor 3, the powder is divided into two paths and enters the high-temperature powder cooling system and the fourth circulating material inlet point through the sixth feed pipe F6 and the seventh feed pipe F7, respectively. The ratio of the two paths can be adjusted arbitrarily between 0 and 100%, and the specific ratio is adjusted according to the actual working conditions.

[0042] like Figure 5 As shown, the high-temperature powder cooling system includes an initial cooling section and a final cooling section. The initial cooling section has ≥1 cyclone cooler stage, and the final cooling section has ≥0 cyclone cooler stages.

[0043] In one embodiment, the primary cooling section includes a first cyclone cooler C5 and a second cyclone cooler C6; The final cooling section includes the third cyclone cooler C7; The cooling section consisting of the first cyclone cooler C5 and the second cyclone cooler C6 is connected to the distributed homogeneous high-temperature activation furnace 4. The cooling air enters the first cooling pipe from the ambient air under the action of the system fan. The third cyclone cooler C7 is an independent cooling section, and the cooling air enters the third cooling pipe under the action of the cooling fan.

[0044] High-temperature powder material enters the second cooling pipe between the first cyclone cooler C5 and the second cyclone cooler C6 through the fifth feed pipe F5. The cooling gas flows from the second cyclone cooler C6 to the first cyclone cooler C5. After gas-solid heat exchange, it enters the first cyclone cooler C5 and completes gas-solid separation. The separated high-temperature gas enters the distributed homogeneous high-temperature activation calcining furnace. Solid powder enters the first cooling pipe between the ambient atmosphere and the first cyclone cooler C5 through the eighth feed pipe F8. After gas-solid heat exchange, it enters the second cyclone cooler C6. The separated gas enters the second cooling pipe between the first cyclone cooler C5 and the second cyclone cooler C6, completing the initial cooling and sensible heat recovery of the high-temperature powder. Solid powder enters the third cooling pipe between the ambient atmosphere and the third cyclone cooler C7 through the ninth feed pipe F9, completing the final cooling.

[0045] like Figure 6 As shown, this is the finished product collection system. When the material leaving the heat treatment system through the ninth discharge pipe F9 is too hot, it cannot directly enter the finished product storage and packaging system. Therefore, ambient air is used as the cooling medium in the finished product collection system. The material is cooled through the third cooling pipe to reduce its temperature to a reasonable temperature that is permissible for material storage and packaging. The cooled gas-powder mixture undergoes gas-solid separation in the third cyclone cooler C7. The separated powder enters the finished product collection and conveying device. The separated dust-laden gas is further collected through a bag dust collector and enters the finished product collection and conveying device to complete the collection of finished materials for subsequent processes.

[0046] like Figure 4 As shown, the flue gas purification system consists of a primary boiler, a nitrogen oxide purification device, a secondary boiler, a system fan, a dust removal and purification system, a booster fan, and a sulfur dioxide purification system.

[0047] Under the action of the system fan, the high-temperature flue gas from the distributed homogeneous high-temperature activation and calcination system of coal gangue powder first enters the primary boiler. Under the action of the primary boiler, the flue gas temperature is controlled within the range of 350±10℃. Then it enters the nitrogen oxide purification device. After completing the nitrogen oxide purification, it enters the secondary boiler for further cooling to 200±20℃. After passing through the system fan, it enters the dust removal and purification device. The purified flue gas enters the sulfur dioxide purification system under the action of the booster fan. After completing the purification, it meets the emission standards.

[0048] Example 2 like Figure 2 , Figure 4 , Figures 6 to 9 As shown, this embodiment provides a distributed homogeneous high-temperature activation and calcination system for coal gangue, including a coal gangue powder preparation and feeding system, a distributed homogeneous high-temperature activation and calcination system for coal gangue powder, a high-temperature powder cooling system, a finished product collection system, and a flue gas purification system. The distributed homogeneous high-temperature activation and calcination system for coal gangue powder includes a primary cyclone preheating system and a distributed homogeneous high-temperature activation furnace 4. The air inlet of the primary cyclone preheating system is connected to the coal gangue powder preparation and feeding system, and the primary cyclone preheating system is connected to the homogeneous high-temperature activation furnace. The material in the distributed homogeneous high-temperature activation furnace 4 is separated by a gas-solid cyclone separator and then divided into two parts by a distributor. One part enters the high-temperature powder cooling system, and the other part returns to the distributed homogeneous high-temperature activation furnace 4 for circulation. The discharge end of the high-temperature powder cooling system is connected to the finished product collection system, the air outlet end of the high-temperature powder cooling system is connected to the flue gas purification system through the distributed homogeneous high-temperature activation and calcination system for coal gangue powder, and the air inlet end of the high-temperature powder cooling system is connected to the ambient air pipeline.

[0049] like Figure 2As shown, the coal gangue powder preparation and feeding system includes a coal gangue pretreatment system and a coal gangue powder metering and conveying system connected in sequence. The coal gangue pretreatment system includes a coal gangue pre-homogenization stockpile, a coal gangue powder preparation system, and a coal gangue powder homogenization silo, which are arranged in sequence. The coal gangue powder metering and conveying system includes a metering system connected to the coal gangue powder homogenization silo and a conveying system connected to the metering system. The conveying system feeds the coal gangue powder into the distributed homogenized high-temperature activation and calcination system via pneumatic conveying or mechanical conveying.

[0050] The qualified coal gangue entering the site undergoes preliminary homogenization in the pre-homogenization stockpile. After pre-homogenization, the coal gangue is metered and then enters the coal gangue grinding system. The fineness of the ground material is 200-400 mesh, and it is further homogenized during the grinding process. The ground material is stored in the powder homogenization silo, and it is homogenized again during the silo entry and exit process. The material exiting the silo is fed into the coal gangue powder distributed homogenization heat treatment system through the coal gangue powder metering and conveying system.

[0051] like Figure 8 As shown, the main body of the coal gangue distributed homogeneous high-temperature activation and calcination system consists of a cyclone preheater composed of a second cyclone preheater C2, a third cyclone preheater C3, and a fourth cyclone preheater C4, and a distributed homogeneous high-temperature activation furnace 4.

[0052] After being metered, the coal gangue powder is transported to the heat treatment system and fed into the heat exchange tube between the third cyclone preheater C3 and the second cyclone preheater C2 through the second feeding point. The flue gas flows through the third cyclone preheater C3 and the second cyclone preheater C2. After gas-solid heat exchange, it enters the second cyclone preheater C2 and completes gas-solid separation. The separated solid powder is divided into two parts by the first distributor 1 and enters the heat exchange tube between the fourth cyclone preheater C4 and the third cyclone preheater C3 and the distributed homogeneous high-temperature activation furnace 4 through the second discharge pipe F2 and the third discharge pipe F3, respectively. The distribution ratio of the two powders can be adjusted arbitrarily between 0 and 100%. The separated high-temperature flue gas enters the pipeline between the first cyclone preheater C1 and the second cyclone preheater C2, where gas-solid separation occurs. The separated flue gas then enters the flue gas purification system.

[0053] In the heat exchange tube between the third cyclone preheater C3 and the fourth cyclone preheater C4, the flue gas flows from the fourth cyclone preheater C4 to the third cyclone preheater C3. After gas-solid heat exchange, it enters the third cyclone preheater C3 and completes gas-solid separation. The separated high-temperature flue gas enters the heat exchange tube of the third cyclone preheater C3 and the second cyclone preheater C2. The solid powder enters the second distributor 2 through the C3-1 feed pipe. Under the action of the second distributor 2, the powder is divided into two paths and enters the first furnace inlet point and the third furnace inlet point through the fourth and fifth feed pipes F5 respectively. The ratio of the two paths can be adjusted arbitrarily between 0 and 100%.

[0054] In the distributed homogeneous high-temperature activation furnace 4, the material enters the furnace through a distributed feeding system consisting of the first, second, third, and fourth inlet points. High-temperature combustion air enters from the bottom of the furnace body through the first cyclone cooler C5. Supplemental heat source is provided by a distributed combustion supply system consisting of the first, second, and third burners. In the distributed homogeneous high-temperature activation furnace 4, the flue gas temperature is ≥800℃. After homogenization heat treatment under the action of high-temperature flue gas, the flue gas enters the fourth cyclone preheater C4 and completes gas-solid separation. The high-temperature flue gas then enters the heat exchange tube between the fourth cyclone preheater C4 and the third cyclone preheater C3. The solid powder enters the third distributor 3 through the C4-1 discharge pipe. Under the action of the third distributor 3, the powder is divided into two paths, which enter the high-temperature powder cooling system and the fourth inlet point through the sixth discharge pipe F6 and the seventh discharge pipe F7, respectively. The ratio of the two paths can be adjusted arbitrarily between 0% and 100%, and the specific ratio is adjusted according to the actual working conditions.

[0055] C1, First Cyclone Preheater C1; C2, Second Cyclone Preheater C2; C3, Third Cyclone Preheater C3; C4, Fourth Cyclone Preheater C4; C5, First Cyclone Cooler C5; C6, Second Cyclone Cooler C6; C7, Third Cyclone Cooler C7; like Figure 9 As shown, the high-temperature powder cooling system includes an initial cooling section and a final cooling section. The initial cooling section has ≥1 cyclone cooler stage, and the final cooling section has ≥0 cyclone cooler stages.

[0056] The primary cooling section includes the first cyclone cooler C5 and the second cyclone cooler C6; The final cooling section includes the third cyclone cooler C7; The outlet of the first cyclone cooler C5 is connected to the distributed homogeneous high-temperature activation furnace 4. The cooling air enters the second cooling pipe from the ambient air under the action of the system fan. The third cyclone cooler C7 is an independent cooling section. The cooling air enters the third cooling pipe under the action of the cooling fan.

[0057] High-temperature powder material enters the second cooling pipe between the ambient atmosphere and the first cyclone cooler C5 through the sixth feed pipe F6. The cooling gas flows from the ambient air to the first cyclone cooler C5. After gas-solid heat exchange, it enters the first cyclone cooler C5 and completes gas-solid separation. The separated high-temperature gas enters the distributed homogeneous high-temperature activation furnace 4 to complete the initial cooling and sensible heat recovery of the high-temperature powder. The solid powder enters the third cooling pipe between the ambient atmosphere and the third cyclone cooler C7 through the eighth feed pipe F8 to complete the final cooling.

[0058] like Figure 6 As shown in the diagram, the finished product collection system is as follows: After the high-temperature material passes through the first cyclone cooler C5, when the material leaving the heat treatment system through the eighth discharge pipe F8 is too hot, it cannot directly enter the finished product storage and packaging system. Therefore, in the finished product collection system, ambient air is used as the cooling medium, and the material is cooled through the third cooling pipe to reduce the material temperature to a reasonable temperature permissible for material storage and packaging. The cooled gas-powder mixture undergoes gas-solid separation in the third cyclone cooler C7. The separated powder enters the finished product collection and conveying device, and the separated dust-containing gas is further collected through a bag dust collector and enters the finished product collection and conveying device to complete the collection of finished materials for subsequent processes.

[0059] like Figure 4 As shown, the flue gas purification system consists of a primary boiler, a nitrogen oxide purification device, a secondary boiler, a system fan, a dust removal and purification system, a booster fan, and a sulfur dioxide purification system.

[0060] Under the action of the system fan, the high-temperature flue gas from the distributed homogeneous high-temperature activation and calcination system of coal gangue powder first enters the primary boiler. Under the action of the primary boiler, the flue gas temperature is controlled within the range of 340±20℃. Then it enters the nitrogen oxide purification device. After completing the nitrogen oxide purification, it enters the secondary boiler for further cooling to 200±20℃. After passing through the system fan, it enters the dust removal and purification device. The purified flue gas enters the sulfur dioxide purification system under the action of the booster fan. After completing the purification, it meets the emission standards.

Claims

1. A distributed homogeneous high-temperature activation calcination system for coal gangue, characterized in that, It includes a coal gangue powder preparation and feeding system, a coal gangue powder distributed homogeneous high-temperature activation and calcination system, a high-temperature powder cooling system, a finished product collection system, and a flue gas purification system; The distributed homogeneous high-temperature activation and calcination system for coal gangue powder includes a primary cyclone preheating system and a distributed homogeneous high-temperature activation furnace (4). The air inlet of the primary cyclone preheating system is connected to the coal gangue powder preparation and feeding system. The primary cyclone preheating system is connected to the homogeneous high-temperature activation furnace. The material in the distributed homogeneous high-temperature activation furnace (4) is separated by a gas-solid cyclone separator and then divided into two parts by a distributor. One part enters the high-temperature powder cooling system, and the other part returns to the distributed homogeneous high-temperature activation furnace (4) for circulation. The discharge end of the high-temperature powder cooling system is connected to the product collection system, the air outlet end of the high-temperature powder cooling system is connected to the flue gas purification system through the coal gangue powder distributed homogeneous high-temperature activation and calcination system, and the air inlet end of the high-temperature powder cooling system is connected to the ambient air pipeline.

2. The distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 1, characterized in that, The coal gangue powder preparation and feeding system includes a coal gangue pretreatment system and a coal gangue powder metering and conveying system connected in sequence. The coal gangue pretreatment system includes a coal gangue pre-homogenization stockpile, a coal gangue powder preparation system, and a coal gangue powder homogenization silo, arranged sequentially. The coal gangue powder metering and conveying system includes a metering system connected to the coal gangue powder homogenization silo and a conveying system connected to the metering system. The conveying system feeds the coal gangue powder distributed homogenization high-temperature activation and calcination system into the coal gangue powder through pneumatic conveying or mechanical conveying.

3. The distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 2, characterized in that, The primary cyclone preheating system includes a first cyclone preheater (C1), a second cyclone preheater (C2), a third cyclone preheater (C3), and a fourth cyclone preheater (C4) connected in series. The outlet of the first cyclone preheater (C1) is connected to the flue gas purification system, the inlet of the first cyclone preheater (C1) is connected to the outlet of the second cyclone preheater (C2) through a heat exchange tube, and the material outlet of the first cyclone preheater (C1) is connected to the heat exchange pipe between the second cyclone preheater (C2) and the third cyclone preheater (C3) through a first discharge pipe (F1). The air inlet of the second cyclone preheater (C2) is connected to the air outlet of the third cyclone preheater (C3) through a heat exchange pipe. The outlet of the second cyclone preheater (C2) is connected to a first distributor (1). The outlet of the first distributor (1) is connected to a second discharge pipe (F2) and a third discharge pipe (F3). The second discharge pipe (F2) is connected to the heat exchange pipe between the third cyclone preheater (C3) and the fourth cyclone preheater (C4). The third discharge pipe (F3) is connected to the side wall of the distributed homogeneous high-temperature activation furnace (4). The air inlet of the third cyclone preheater (C3) is connected to the air outlet of the fourth cyclone preheater (C4) through a heat exchange pipe. The outlet of the third cyclone preheater (C3) is connected to a second distributor (2). The outlet of the second distributor (2) is connected to a fourth discharge pipe (F4) and a fifth discharge pipe (F5). The fourth discharge pipe (F4) and the fifth discharge pipe (F5) are respectively connected to the side wall of the distributed homogeneous high-temperature activation furnace (4). The distribution ratio of the fourth discharge pipe (F4) and the fifth discharge pipe (F5) can be adjusted between 0 and 100%. The air inlet of the fourth cyclone preheater (C4) is connected to the material outlet of the distributed homogenizing high-temperature activation furnace (4). The outlet of the fourth cyclone preheater (C4) is connected to the third distributor (3). The outlet of the third distributor (3) is connected to the sixth discharge pipe (F6) and the seventh discharge pipe (F7). The sixth discharge pipe (F6) is connected to the high-temperature powder cooling system. The seventh discharge pipe (F7) is connected to the side wall of the distributed homogenizing high-temperature activation furnace (4). The material distribution ratio of the sixth discharge pipe (F6) and the seventh discharge pipe (F7) can be adjusted between 0 and 100%. The output end of the conveying system is divided into two pipelines. One pipeline is connected to the heat exchange pipeline between the second cyclone preheater (C2) and the third cyclone preheater (C3); the other pipeline is connected to the heat exchange pipeline between the first cyclone preheater (C1) and the second cyclone preheater (C2).

4. The distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 2, characterized in that, The primary cyclone preheating system includes a second cyclone preheater (C2), a third cyclone preheater (C3), and a fourth cyclone preheater (C4) connected in series. The outlet of the second cyclone preheater (C2) is connected to the flue gas purification system. The inlet of the second cyclone preheater (C2) is connected to the outlet of the third cyclone preheater (C3) through a heat exchange pipe. The outlet of the second cyclone preheater (C2) is connected to a first distributor (1). The outlet of the first distributor (1) is connected to a second discharge pipe (F2) and a third discharge pipe (F3). The second discharge pipe (F2) is connected to the heat exchange pipe between the third cyclone preheater (C3) and the fourth cyclone preheater (C4). The third discharge pipe (F3) is connected to the side wall of the distributed homogeneous high-temperature activation furnace (4). The air inlet of the third cyclone preheater (C3) is connected to the air outlet of the fourth cyclone preheater (C4) through a heat exchange pipe. The outlet of the third cyclone preheater (C3) is connected to a second distributor (2). The outlet of the second distributor (2) is connected to a fourth discharge pipe (F4) and a fifth discharge pipe (F5). The fourth discharge pipe (F4) and the fifth discharge pipe (F5) are respectively connected to the side wall of the distributed homogeneous high-temperature activation furnace (4). The distribution ratio of the fourth discharge pipe (F4) and the fifth discharge pipe (F5) can be adjusted between 0 and 100%. The air inlet of the fourth cyclone preheater (C4) is connected to the material outlet of the distributed homogenizing high-temperature activation furnace (4). The outlet of the fourth cyclone preheater (C4) is connected to the third distributor (3). The outlet of the third distributor (3) is connected to the sixth discharge pipe (F6) and the seventh discharge pipe (F7). The sixth discharge pipe (F6) is connected to the high-temperature powder cooling system. The seventh discharge pipe (F7) is connected to the side wall of the distributed homogenizing high-temperature activation furnace (4). The material distribution ratio of the sixth discharge pipe (F6) and the seventh discharge pipe (F7) can be adjusted between 0 and 100%. The output end of the conveying system is connected to the heat exchange pipeline between the second cyclone preheater (C2) and the third cyclone preheater (C3) via a pipeline.

5. A distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 3 or 4, characterized in that, The high-temperature powder cooling system includes an initial cooling section and a final cooling section. The initial cooling section has ≥1 cyclone cooler stage, and the final cooling section has ≥0 cyclone cooler stages.

6. The distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 5, characterized in that, The primary cooling section includes a first cyclone cooler (C5) and a second cyclone cooler (C6). The final cooling section includes a third cyclone cooler (C7). The air inlet of the third cyclone cooler (C7) is connected to the third cooling pipe, and the discharge outlet of the third cyclone cooler (C7) is connected to the finished product collection system through a pipe. The air inlet of the second cyclone cooler (C6) is connected to the first cooling pipe, the air outlet of the second cyclone cooler (C6) is connected to the air inlet of the first cyclone cooler (C5) through the second cooling pipe, and the discharge outlet of the second cyclone cooler (C6) is connected to the third cooling pipe of the third cyclone cooler (C7) through the ninth discharge pipe (F9). The outlet of the first cyclone cooler (C5) is connected to the inlet of the distributed homogeneous high-temperature activation furnace (4), and the outlet of the first cyclone cooler (C5) is connected to the first cooling pipe through the eighth discharge pipe (F8).

7. The distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 6, characterized in that, The finished product collection system includes a finished product collection and conveying device and a bag filter dust collector connected to the outlet of the third cyclone cooler (C7). A cooling fan is installed on the air outlet pipe of the bag dust collector, and the material outlet pipe of the bag dust collector is connected to the finished product collection and conveying device.

8. The distributed homogeneous high-temperature activation calcination system for coal gangue according to claim 7, characterized in that, The flue gas purification system includes a primary boiler, a nitrogen oxide purification device, a secondary boiler, a system fan, a dust removal and purification system, a booster fan, and a sulfur dioxide purification system.

9. A method for distributed homogeneous high-temperature activation calcination of coal gangue, characterized in that, The coal gangue distributed homogeneous high-temperature activation calcination system according to any one of claims 1 to 8 is adopted.

10. A distributed homogeneous high-temperature activation calcination method for coal gangue according to claim 9, characterized in that, Includes the following steps: S1. Coal gangue pretreatment system pretreatment: During operation, the incoming coal gangue is crushed and then enters the coal gangue pre-homogenization stockpile to complete the first stage of homogenization; the homogenized material enters the coal gangue powder preparation system, where a second homogenization is completed during the grinding process; the ground material enters the coal gangue powder homogenization silo for further homogenization; through pretreatment, the standard deviation of the main oxides is controlled within ±0.5%; S2. Coal gangue powder conveying and feeding: After pretreatment, the coal gangue powder is metered by the metering system and then fed into the coal gangue distributed homogeneous high-temperature activation calcination system. The feeding method is either pneumatic conveying followed by injection or mechanical conveying followed by feeding. S3, Distributed homogeneous high-temperature activation and calcination treatment of coal gangue: S31, Primary preheating treatment: The material enters the primary preheating cyclone system through the feeding point. The high-temperature flue gas of the distributed homogeneous high-temperature activation furnace (4) is used as the heat source to complete the stepped preheating and temperature rise, enter the dehydration stage, and enter the distributed homogeneous high-temperature activation furnace (4) after partial dehydration. The flue gas after heat exchange enters the subsequent flue gas treatment system. S32. Homogeneous high-temperature activation: The distributed homogeneous high-temperature activation furnace (4) with distributed feeding and fuel cascade replenishment functions is the core. After primary preheating treatment, the material is fed into the distributed homogeneous high-temperature activation furnace (4) at multiple points to avoid the concentrated release of heat from the coal gangue in the distributed homogeneous high-temperature activation furnace (4) and the resulting overburning. When the coal gangue has low heat and cannot maintain the furnace temperature, the temperature field in the distributed homogeneous high-temperature activation furnace (4) is kept stable by cascade fuel replenishment. After the deep heat treatment process of decarbonization, dehydroxylation, and desulfurization is completed in the distributed homogeneous high-temperature activation furnace (4), the gas-solid separation is completed by the cyclone separator. The high-temperature flue gas enters the primary cyclone preheating system, and the high-temperature material enters the subsequent circulating calcination system and the high-temperature powder cooling system. S33, Circulating calcination treatment: The material exiting the distributed homogeneous high-temperature activation furnace (4) is separated by a gas-solid cyclone separator and then divided into two parts by a distributor. One part enters the subsequent high-temperature powder cooling system, and the other part returns to the distributed homogeneous high-temperature activation furnace (4) for circulation. S4. High-temperature powder cooling treatment: Ambient air is used as the heat exchange medium. The amount of cooling air is determined by the system fan. After heat exchange, the high-temperature air enters the distributed homogeneous high-temperature activation furnace (4) as combustion air and suspension medium to complete the cooling of high-temperature powder and the recovery of sensible heat. After preliminary cooling, the powder enters the terminal cooling system. The cooled material and air enter the finished product collection system and the dust-containing gas purification system, respectively. S5. Flue gas purification treatment: The high-temperature flue gas in the coal gangue high-temperature activation and calcination system contains dust, sulfur dioxide and nitrogen oxide pollutants. Under the action of the system fan, the flue gas passes through the primary boiler, the nitrogen oxide purification device and the secondary boiler in sequence to complete the primary cooling, nitrogen oxide purification and secondary cooling of the flue gas, and control the air temperature of the system fan to 180~200℃. Under the action of the booster fan, the flue gas at the outlet of the system fan enters the dust removal and purification device. After the dust is purified, the flue gas enters the sulfur dioxide purification system, and the purified flue gas is discharged in compliance with standards.

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