Method and device for coal gangue decarburization

Abstract

The invention discloses a coal gangue decarburization method and device, the device comprises a feeding bin, a cyclone preheating separator and a cyclone separator, the feeding bin is communicated with the cyclone preheating separator, and the cyclone preheating separator is provided with an auxiliary heating device; the cyclone preheating separator is communicated with the suspension furnace, and the cyclone preheating separator is communicated with the suspension furnace through the cyclone separator; one end of the suspension furnace is communicated with an air heater, and the other end is communicated with the cyclone separator; the cyclone separator is communicated with an air feeder; calcination at the sintering temperature not higher than 1050 DEG C is realized, so that the problems of overhigh ignition loss and sintering are solved, the ignition loss is effectively controlled to be 0.5% or below, and meanwhile, the carbon content is controlled to be 0.3% or below; the coal gangue powder can be calcined in 250 meshes, and the plasticity index of the coal gangue powder is not reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment, and particularly relates to a method and device for decarbonizing coal gangue. Background Art

[0002] Coal gangue is a by-product discharged during coal mining and washing. Coal gangue belongs to bulk industrial solid waste, and its main mineral components are inorganic silicates and kaolin minerals. At present, China has become the country with the largest stockpile and annual output of coal gangue. The direct stacking of coal gangue not only causes waste of resources, but also occupies land and causes environmental pollution.

[0003] In order to promote the resource utilization process of coal gangue, previous scholars have carried out a large number of studies; applications and treatments have been carried out in multiple fields, but large-scale utilization of coal gangue has not been achieved. In existing industrial applications, coal gangue is used to prepare cement. After decarbonization processing of coal gangue, it is used as a raw material for cement preparation. Aluminosilicate minerals in coal gangue generate hydrated calcium silicate, hydrated calcium aluminosilicate, etc. These hydrated products can improve the strength of coal gangue cement. Therefore, the application of coal gangue in cement has been widely studied and is one of the effective ways of resource utilization.

[0004] The existing technology for decarbonizing coal gangue usually adopts the sintering treatment method, and its technical routes are one is granular decarbonization technology and the other is powdered decarbonization technology.

[0005] The main process of granular decarbonization technology is to crush coal gangue to a certain particle size and then calcine it in a roasting machine for decarbonization. Since the material is granular, a relatively high sintering temperature is required to achieve decarbonization of the granular material. However, due to the high calcination temperature, the material is sintered, resulting in incomplete decarbonization of the granular material in the sintered block, a relatively high carbon content, and prone to the situation of black-hearted material, reducing the quality of cement; at the same time, the loss on ignition is also relatively high during the calcination process at this high calcination temperature, reducing the utilization rate.

[0006] Based on the physical properties of coal gangue, the sintering temperature of coal gangue is about 1050 °C, the refractoriness is 1300 - 1350 °C, the density is 1.8 g / cm3, and the viscosity is about 1.1; after being finely crushed, coal gangue has plasticity, and when crushed to 250 mesh, its plasticity index can reach 2.8 - 3.0, and the corresponding moisture content is 23% - 25%.

[0007] Regarding the decarbonization research of coal gangue, most are the technical routes of powdered decarbonization technology. For example, Chinese Patent CN118896488A discloses that at a calcination temperature of 1100 °C, the loss on ignition is 0.34%; although the loss on ignition is less than 0.5%, the high calcination temperature causes the material to sinter.

[0008] Chinese Patent CN119349910A discloses that the loss on ignition at a calcination temperature of 1100°C is 1.18%, and too high a calcination temperature causes sintering of the material; it also discloses that the loss on ignition at a sintering temperature of 1050°C is 1.5%; and the loss on ignition at a calcination temperature lower than the sintering temperature is higher than 1.5%, and in order to pursue a better calcination effect, the particles are less than 300 mesh, resulting in a decrease in its plasticity index.

[0009] At the same time, when sintering occurs at a temperature higher than 1050°C, it is also easy to cause blockage of the calcination equipment.

[0010] However, in the process of the inventors of this application implementing the technical solution of the invention in the embodiments of this application, it is found that the above-mentioned technology has at least the following technical problems: high loss on ignition, high carbon content, and reduction of the plasticity index. Summary of the Invention

[0011] The embodiments of this application provide a decarbonization device for coal gangue, which solves the problems of excessive loss on ignition and sintering in the prior art, realizes effective control of the loss on ignition below 0.5% and the carbon content below 0.3%, and at the same time enables the coal gangue powder to be calcined at 250 mesh, retaining the pozzolanic activity of the coal gangue after thermal activation without reducing the plasticity index of the coal gangue powder.

[0012] The embodiments of this application provide a decarbonization device for coal gangue, including a feeding bin (1), a cyclone preheater (2), and a cyclone separator (3). The feeding bin (1) is connected to the cyclone preheater (2), and an auxiliary heating device (10) is provided on the cyclone preheater (2); The cyclone preheater (2) is connected to a suspension furnace (4), and the cyclone preheater (2) is connected to the suspension furnace (4) through the cyclone separator (3); One end of the suspension furnace (4) is connected to a hot air blower (5), and the other end is connected to the cyclone separator (3); The cyclone separator (3) is connected to a forced draft fan (6).

[0013] Preferably, the cyclone preheater (2) includes a first cyclone preheater (21), a second cyclone preheater (22), a third cyclone preheater (23), and a fourth cyclone preheater (24); The cyclone separator (3) includes a first cyclone separator (31), a second cyclone separator (32), and a third cyclone separator (33).

[0014] Preferably, the length of the suspension furnace (4) is 15 - 25 m, the effective inner diameter of the suspension furnace is 325 - 360 mm, the thickness of the refractory material is 190 - 205 mm, and the thickness of the thermal insulation material is 95 - 105 mm.

[0015] Preferably, a first coal feeder (7) and a natural gas supply mechanism (8) are connected to the suspension furnace (4).

[0016] Preferably, the discharge port of the feeding bin (1) is connected to the rising pipe from the air outlet of the second cyclone preheater (22) to the air inlet of the first cyclone preheater (21); The discharge port of the first cyclone preheater (21) is connected to the rising pipe from the air outlets of the third cyclone preheater (23) and the fourth cyclone preheater (24) to the air inlet of the second cyclone preheater (22); The discharge port of the second cyclone preheater (22) is connected to the rising pipe from the air outlet of the first cyclone separator (31) to the air inlet of the third cyclone preheater (23); The discharge port of the third cyclone preheater (23) is connected to the rising pipe from the air outlet of the first cyclone separator (31) to the air inlet of the fourth cyclone preheater (24); The discharge port of the fourth cyclone preheater (24) is connected to the rising pipe from the air outlet of the second cyclone separator (32) to the suspension furnace (4).

[0017] Preferably, the discharge port of the first cyclone separator (31) is connected to the rising pipe from the air blower (6) to the air inlet of the second cyclone separator (32).

[0018] Preferably, the air inlet of the third cyclone separator (33) is connected to the end of the suspension furnace (4); the air outlet of the third cyclone separator (33) is connected to the air inlet of the first cyclone separator (31).

[0019] Preferably, the rising pipe from the air blower (6) to the air inlet of the second cyclone separator (32) passes through the hot air blower (5).

[0020] Preferably, the hot air blower (5) is connected to a second coal feeder (9).

[0021] A decarbonization method for coal gangue, based on the foregoing decarbonization device, to achieve the decarbonization of coal gangue, includes the following steps: S1, device preheating: hot air is sent into the suspension furnace (4) through the hot air blower (5), and the hot air passes through the end of the suspension furnace (4) and flows through the cyclone separator (3) to the cyclone preheater (2); S101, hot air flowing out of the end of the suspension furnace (4) passes through the third cyclone separator (33) and flows to the first cyclone separator (31). After being separated by the first cyclone separator (31), the hot air flows to the third cyclone preheating separator (23) and the fourth cyclone preheating separator (24). After flowing out, the hot air passes through the second cyclone preheating separator (22) and flows to the first cyclone preheating separator (21); S2, starting the blower (6), the blower (6) heats the fresh air in the suspension furnace (4) through a pipeline and sends it to the second cyclone separator (32), and then flows into the suspension furnace (4); S3, starting the auxiliary heating device (10). After the device is preheated in step S1, the auxiliary heating device (10) is used to adjust the cyclone preheating separators (2), and respectively adjust the temperatures of the first cyclone preheating separator (21), the second cyclone preheating separator (22), the third cyclone preheating separator (23), and the fourth cyclone preheating separator (24); S4, starting the first coal feeder (7) and the natural gas supply mechanism (8), and when the material is blown into the suspension furnace (4) through the air outlet of the second cyclone separator (32) to the ascending pipeline of the suspension furnace (4), the first coal feeder (7) and the natural gas supply mechanism (8) simultaneously blow the mixed fuel into the suspension furnace (4); S5, starting the feeding bin (1), and the feeding bin (1) conveys 250 mesh coal gangue powder to the cyclone preheating separator (2).

[0022] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. By adopting a four-stage cyclone preheating separator to adjust the preheating temperature, the calcination temperature is effectively controlled below the sintering temperature of 1050°C through suspension calcination to solve the problem of excessive ignition loss, and then solve the sintering problem caused by the calcination temperature being higher than the sintering temperature. The technical solution of the present application realizes calcination at a sintering temperature of not more than 1050°C, effectively controls the ignition loss to below 0.5%, and controls the carbon content to below 0.3%.

[0023] 2. Due to the use of a four-stage cyclone preheating separator to adjust the preheating temperature, and then through the suspension calcination method, the coal gangue powder is calcined at a sintering temperature of no more than 1050°C with a mesh size of 250, which can achieve the purpose of decarbonization without reducing the plasticity index of the coal gangue powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the device structure in the embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a cyclone preheating separator in an embodiment of the present application; Figure 3 This is a schematic structural diagram of the cyclone separator in the embodiment of the present application. Specific embodiments

[0025] In the embodiment of the present application, by providing a decarbonization method and a decarbonization device for coal gangue, the problems in the prior art are solved. When calcining at a sintering temperature higher than 1050°C to improve the decarbonization effect, there are problems such as too high loss on ignition and sintering; and when the powder is more than 250 mesh to improve the decarbonization effect, the plasticity index of the coal gangue powder decreases when calcining at a sintering temperature higher than 1050°C.

[0026] The technical solution in the embodiment of the present application to solve the above problems is generally as follows: By using a four-stage cyclone preheater-separator to adjust the preheating temperature, and then through the way of suspension calcination, calcine in the suspension furnace at a sintering temperature not higher than 1050°C. At the same time, due to the tubular design of the suspension furnace, the coal gangue powder to be calcined is calcined in the tubular suspension furnace for a long time, so that the calcination is sufficient and the decarbonization effect is effectively improved.

[0027] The calcination temperature in the above suspension furnace is not higher than 1050°C, which solves the sintering problem caused by the calcination temperature higher than the sintering temperature.

[0028] In this way, the coal gangue powder can be calcined in the suspension furnace at 250 mesh, which can achieve the purpose of decarbonization and does not reduce the plasticity index of the coal gangue powder.

[0029] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0030] Embodiment 1 The embodiment of the present application provides a decarbonization device for coal gangue, including a feeding bin (1), a cyclone preheater-separator (2), and a cyclone separator (3). The feeding bin (1) is communicated with the cyclone preheater-separator (2), and an auxiliary heating device (10) is arranged on the cyclone preheater-separator (2); the cyclone preheater-separator (2) is communicated with a suspension furnace (4), and the cyclone preheater-separator (2) is communicated with the suspension furnace (4) through the cyclone separator (3); one end of the suspension furnace (4) is communicated with a hot air blower (5), and the other end is communicated with the cyclone separator (3); the cyclone separator (3) is communicated with a blower (6).

[0031] In this embodiment, the cyclone separator (3) includes a first cyclone separator (31), a second cyclone separator (32), and a third cyclone separator (33). The discharge port of the first cyclone separator (31) communicates with the rising pipeline from the air blower (6) to the air inlet of the second cyclone separator (32).

[0032] The air inlet of the third cyclone separator (33) is connected to the end of the suspension furnace (4), and the air outlet of the third cyclone separator (33) communicates with the air inlet of the first cyclone separator (31).

[0033] The air blower (6) sends fresh air into the suspension furnace (4) through the second cyclone separator (32) to mix with the hot air sent into the suspension furnace (4) by the hot air blower (5). Then, through the long cylindrical suspension furnace (4), the hot air is blown into the third cyclone separator (33) at the end of the suspension furnace (4). Solid-gas separation is carried out by the third cyclone separator (33) to separate the solid particle product 1. Then, the separated hot gas is transported to the first cyclone separator (31) for solid-gas separation again. The hot air separated by the first cyclone separator (31) is transported to the cyclone preheating separator (2), and the separated solid particles enter the second cyclone separator (32) through the pipeline for solid-gas separation to separate the solid product 2.

[0034] The solid dust carried in the hot air after solid-gas separation by the third cyclone separator (33) is separated through two stages of the first cyclone separator (31) and the second cyclone separator (32), and solid-gas separation is more fully realized.

[0035] The hot air blower (5) is connected to the second coal feeder (9) to enable the hot air blower (5) to transport hot air into the suspension furnace (4).

[0036] Embodiment Two In the embodiment of the present application, the cyclone preheating separator (2) includes a first cyclone preheating separator (21), a second cyclone preheating separator (22), a third cyclone preheating separator (23), and a fourth cyclone preheating separator (24).

[0037] The feeding bin (1) is connected to the cyclone preheating separator (2). The coal gangue powder in the feeding bin (1) enters the first cyclone preheating separator (21) for solid-gas separation through the rising pipeline connecting the discharge port of the feeding bin (1) to the air inlet of the first cyclone preheating separator (21) from the air outlet of the second cyclone preheating separator (22).

[0038] It should be noted that the gas after solid-gas separation by the first cyclone preheating separator (21) enters the bag-type collector through the pipeline for dust collection, and the gas separated by the bag-type collector is transported to the chimney after being processed by the centrifugal fan.

[0039] The solid powder separated by the first cyclone preheater (21) enters the rising pipe connecting the discharge port of the first cyclone preheater (21) to the air inlets of the third cyclone preheater (23) and the fourth cyclone preheater (24) and then enters the second cyclone preheater (22) for solid-gas separation. The hot air enters the first cyclone preheater (21).

[0040] The solid powder separated by the second cyclone preheater (22) enters the rising pipe connecting the discharge port of the second cyclone preheater (22) to the air inlet of the third cyclone preheater (23) at the air outlet of the first cyclone separator (31) and then enters the third cyclone preheater (23) for solid-gas separation. The hot air enters the second cyclone preheater (22).

[0041] The solid powder separated by the third cyclone preheater (23) enters the rising pipe connecting the discharge port of the third cyclone preheater (23) to the air inlet of the fourth cyclone preheater (24) at the air outlet of the first cyclone separator (31) and then enters the fourth cyclone preheater (24) for solid-gas separation. The hot air enters the second cyclone preheater (22).

[0042] The solid powder separated by the fourth cyclone preheater (24) enters the rising pipe connecting the discharge port of the fourth cyclone preheater (24) to the suspension furnace (4) at the air outlet of the second cyclone separator (32).

[0043] In this example, since the hot air loses heat during the rising process through the third cyclone preheater (23) and the fourth cyclone preheater (24), and then successively through the second cyclone preheater (22) and the first cyclone preheater (21), the shell of the cyclone preheater (2) is designed as a double-layer structure, and an auxiliary heating device (10) is arranged in the middle. The auxiliary heating device (10) is an electric heating device in the prior art and is used to assist in adjusting and increasing the temperature.

[0044] Embodiment III In the embodiment of the present application, the length of the suspension furnace (4) is 15 - 25 m, the effective inner diameter of the suspension furnace is 325 - 360 mm, the thickness of the refractory material is 190 - 205 mm, and the thickness of the heat insulation material is 95 - 105 mm.

[0045] More preferably, the length of the suspension furnace (4) is 20 m, the effective inner diameter of the suspension furnace 4 is 350 mm, and hot air drives the gangue powder to travel in the suspension furnace (4) at a flow rate of 1.5 m / min to achieve suspension heat exchange.

[0046] The refractory material on the inner wall of the suspension furnace 4 is 200 mm thick, and the thermal insulation material on the outer wall is 100 m thick, so that the temperature inside the suspension furnace 4 can be controlled at 950 - 1050 °C.

[0047] Example 4 In the embodiment of the present application, a first coal feeder (7) and a natural gas supply mechanism (8) are connected to the suspension furnace (4). When hot air drives the gangue powder to travel in the suspension furnace (4) at a flow rate of 1.5 m / min, the first coal feeder (7) blows pulverized coal into the suspension furnace (4) through a pipeline. At the same time, the natural gas supply mechanism (8) is connected to the pipeline for blowing pulverized coal. When entering the suspension furnace (4), the pulverized coal is mixed with natural gas and blown into the suspension furnace (4), ignited under the hot air in the suspension furnace (4), and realizes suspension calcination with the gangue powder.

[0048] Example 5 In the embodiment of the present application, the rising pipeline from the air blower (6) to the air inlet of the second cyclone separator (32) passes through the hot air blower (5). The air blower (6) blows fresh air into the second cyclone separator (32) to ensure the oxygen for the combustion of the pulverized coal and natural gas mixture in the suspension furnace (4), and the pipeline passes through the hot air blower (5) so that the coal in the hot air blower 5 heats the pipeline when burning, to ensure the temperature of the fresh air sent by the air blower (6) and not affect the temperature fluctuation in the suspension furnace (4).

[0049] Example 6 The embodiment of the present application provides a decarbonization method for gangue. Based on the foregoing decarbonization device, a method for realizing gangue decarbonization includes the following steps: S1. Device preheating: Send hot air into the suspension furnace (4) through the hot air blower (5). The hot air passes through the end of the suspension furnace (4) and flows to the cyclone preheater (2) through the cyclone separator (3); S101. The hot air flowing out from the end of the suspension furnace (4) flows to the first cyclone separator (31) through the third cyclone separator (33). After being separated by the first cyclone separator (31), the hot air flows to the third cyclone preheater (23) and the fourth cyclone preheater (24), and then flows to the first cyclone preheater (21) through the second cyclone preheater (22) after flowing out; S2. Start the air blower (6). The air blower (6) heats the fresh air in the pipeline in the suspension furnace (4) and then sends it to the second cyclone separator (32), and then flows into the suspension furnace (4); S3. Start the auxiliary heating device (10). After the device preheating is completed in step S1, the auxiliary heating device (10) is used to adjust the cyclone preheater (2), and separately adjust the temperatures of the first cyclone preheater (21), the second cyclone preheater (22), the third cyclone preheater (23), and the fourth cyclone preheater (24). S4. Start the first coal feeder (7) and the natural gas supply mechanism (8). When blowing materials into the suspension furnace (4) through the rising pipe from the air outlet of the second cyclone separator (32) to the suspension furnace (4), the first coal feeder (7) and the natural gas supply mechanism (8) simultaneously blow the mixed fuel into the suspension furnace (4). S5. Start the feed bin (1), and the feed bin (1) conveys the coal gangue powder of 250 mesh to the cyclone preheater (2).

[0050] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. Since a four-stage cyclone preheater is adopted to adjust the preheating temperature, and then through the method of suspension calcination, the calcination temperature is effectively controlled below the sintering temperature of 1050 °C to solve the problem of excessive loss on ignition, and further solve the sintering problem caused by the calcination temperature higher than the sintering temperature at the same time; the technical solution of the present application realizes calcination at a sintering temperature not greater than 1050 °C, effectively controls the loss on ignition below 0.5%, and at the same time controls the carbon content below 0.3%.

[0051] 2. Since a four-stage cyclone preheater is adopted to adjust the preheating temperature, and then through the method of suspension calcination, the coal gangue powder can be calcined at 250 mesh at a sintering temperature not greater than 1050 °C, which can achieve the purpose of decarbonization and at the same time does not reduce the plasticity index of the coal gangue powder.

[0052] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0053] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A decarbonization device for coal gangue, comprising a feeding bin (1), a cyclone preheating separator (2), and a cyclone separator (3), characterized in that: The feeding bin (1) is connected to the cyclone preheating separator (2), and the cyclone preheating separator (2) is provided with an auxiliary heating device (10); The cyclone preheating separator (2) is connected to the suspension furnace (4), and the cyclone preheating separator (2) is connected to the suspension furnace (4) through the cyclone separator (3); One end of the suspension furnace (4) is connected to the hot air blower (5), and the other end is connected to the cyclone separator (3); The cyclone separator (3) is connected to the air blower (6).

2. The decarbonization device according to claim 1, characterized in that: The cyclone preheating separator (2) comprises a first cyclone preheating separator (21), a second cyclone preheating separator (22), a third cyclone preheating separator (23), and a fourth cyclone preheating separator (24); The cyclone separator (3) comprises a first cyclone separator (31), a second cyclone separator (32), and a third cyclone separator (33).

3. The decarbonization device according to claim 1, characterized in that: The suspension furnace (4) has a length of 15-25 m, an effective inner diameter of 325-360 mm, a refractory material thickness of 190-205 mm, and a thermal insulation material thickness of 95-105 mm.

4. The decarbonization device according to claim 1, characterized in that: The suspension furnace (4) is connected to a first coal feeder (7) and a natural gas supply mechanism (8).

5. The decarbonization device according to claim 2, characterized in that: The discharge port of the feeding bin (1) is connected to the ascending pipeline from the air outlet of the second cyclone preheating separator (22) to the air inlet of the first cyclone preheating separator (21); The discharge port of the first cyclone preheating separator (21) is connected to the ascending pipeline from the air outlets of the third cyclone preheating separator (23) and the fourth cyclone preheating separator (24) to the air inlet of the second cyclone preheating separator (22); The discharge port of the second cyclone preheating separator (22) is connected to the ascending pipeline from the air outlet of the first cyclone separator (31) to the air inlet of the third cyclone preheating separator (23); The discharge port of the third cyclone preheating separator (23) is connected to the ascending pipeline from the air outlet of the first cyclone separator (31) to the air inlet of the fourth cyclone preheating separator (24); The discharge port of the fourth cyclone preheating separator (24) is connected to the air outlet of the second cyclone separator (32) to the ascending pipeline of the suspension furnace (4).

6. The decarbonization device according to claim 5, characterized in that: The discharge port of the first cyclone separator (31) is connected to the ascending pipe from the air supply fan (6) to the air inlet of the second cyclone separator (32).

7. The decarbonization device according to claim 6, characterized in that: The air inlet of the third cyclone separator (33) is connected to the end of the suspension furnace (4); and the air outlet of the third cyclone separator (33) is connected to the air inlet of the first cyclone separator (31).

8. The decarbonization device according to claim 6, characterized in that: The ascending pipe from the air supply fan (6) to the air inlet of the second cyclone separator (32) passes through the hot air blower (5).

9. The decarbonization device according to claim 1, characterized in that: The hot air blower (5) is connected to the second coal feeder (9).

10. A method for decarbonizing coal gangue, based on the device according to any one of claims 1 to 9, to achieve the method for decarbonizing coal gangue, characterized in that: The following steps are involved: S1, preheating the device, sending hot air into the suspension furnace (4) through the hot air blower (5), and the hot air passes through the end of the suspension furnace (4) through the cyclone separator (3) and flows to the cyclone preheating separator (2); S101, hot air flowing out of the end of the suspension furnace (4) passes through the third cyclone separator (33) and flows to the first cyclone separator (31). After being separated by the first cyclone separator (31), the hot air flows to the third cyclone preheating separator (23) and the fourth cyclone preheating separator (24). After flowing out, the hot air passes through the second cyclone preheating separator (22) and flows to the first cyclone preheating separator (21); S2, starting the blower (6), the blower (6) heats the fresh air in the suspension furnace (4) through a pipeline, sends the fresh air to the second cyclone separator (32), and then flows into the suspension furnace (4); S3, starting the auxiliary heating device (10). After the device is preheated in step S1, the auxiliary heating device (10) is used to adjust the cyclone preheating separators (2), and respectively adjust the temperatures of the first cyclone preheating separator (21), the second cyclone preheating separator (22), the third cyclone preheating separator (23), and the fourth cyclone preheating separator (24); S4, starting the first coal feeder (7) and the natural gas supply mechanism (8), and when the material is blown into the suspension furnace (4) through the air outlet of the second cyclone separator (32) to the ascending pipeline of the suspension furnace (4), the first coal feeder (7) and the natural gas supply mechanism (8) simultaneously blow the mixed fuel into the suspension furnace (4); S5, starting the feeding bin (1), and the feeding bin (1) conveys 250 mesh coal gangue powder to the cyclone preheating separator (2).

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