A system and method for producing anhydrous semicoke from coal

Abstract

This invention discloses a system and method for producing anhydrous semi-coke from coal. The system includes: a feeding mechanism; a pyrolysis furnace, with the discharge end of the feeding mechanism corresponding to the inlet end of the pyrolysis furnace; a hot semi-coke conveying mechanism, with the discharge end of the pyrolysis furnace corresponding to the inlet end of the hot semi-coke conveying mechanism; a buffer mechanism, with the discharge end of the hot semi-coke conveying mechanism corresponding to the inlet end of the buffer mechanism; and a cooling furnace, with the discharge end of the buffer mechanism corresponding to the inlet end of the cooling furnace. This invention uses dry quenching, generating no quenching wastewater, and the system is completely closed, with no VOC emissions, making the production process environmentally friendly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-temperature pyrolysis of coal, and particularly relates to a system and method for producing anhydrous semi-coke from coal. BACKGROUND

[0002] Semi-coke, also known as semi-coke, is a new type of carbon material, which has the characteristics of high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum, low sulfur and low phosphorus. Because semi-coke can partially replace coke (metallurgical coke) and be used in chemical industry, smelting, gas making and other industries, and semi-coke can be used as clean coal, in recent years, the coal quality utilization with semi-coke as the main product has been greatly developed in China.

[0003] At present, the production of semi-coke from low-rank coal in China mainly uses the internal heating type vertical furnace process, the circulating fluidized bed rapid pyrolysis process and the external heating type rotary furnace process. The circulating fluidized bed rapid pyrolysis process has high tar yield and fast pyrolysis speed, but it uses coal powder with a particle size of ≤6mm, which has large dust quantity, difficult oil and dust separation, small product semi-coke particle size and high ash content, and therefore cannot be applied in large-scale industrialization. The external heating type rotary furnace process has high tar yield and high coal gas purity, but the material layer is disturbed greatly during the rotation of the rotary furnace, which causes the raw coal gas to carry a large amount of dust, easily causes system blockage, and the dust content in the tar is high, and therefore cannot be applied in large-scale industrialization for long-period operation.

[0004] At present, the mature industrialized device for producing semi-coke from low-rank coal in China only uses the internal heating type vertical furnace, which has been applied on a large scale in Yulin, Shaanxi Province. However, this method causes serious environmental pollution, and with the increasing attention of the country to environmental protection, the environmental protection problem has gradually become a bottleneck for its development. The main problems are as follows: first, the water-sealed cooling method is used for discharging coke, and the quenching wastewater meets the hot semi-coke, which produces high-concentration VOC (volatile organic compounds), causing a large amount of VOC to be discharged without organization; second, the semi-coke product contains quenching wastewater, and the use of semi-coke will cause serious negative impact on the environment. In addition to environmental protection, the process of semi-coke from high temperature to water quenching, use and drying has serious energy waste; the hot semi-coke is easily broken into small pieces when it falls into water, which increases the cracks of semi-coke and reduces the quality of semi-coke.

[0005] CN205676418U discloses a low-temperature dry distillation furnace for preparing semi-coke, which is cooled by spraying water from the top to the bottom of the cooling furnace section. The semi-coke at 600 DEG C is cooled by spraying water, and the temperature of the cooled semi-coke is reduced to below 100 DEG C. Although this device can alleviate the environmental problem to some extent, the direct water spraying method for cooling semi-coke still causes VOC unorganized emission because water meets the hot semi-coke. The semi-coke still contains some moisture, and the terminal user, especially calcium carbide production, still needs to dry the semi-coke twice. The moisture-containing semi-coke increases the transportation cost of semi-coke.

[0006] CN209652229U discloses a semi-coke low-moisture quenching device, which includes a coke collecting bin connected with a coke discharging bin at the bottom, a scraper at the bottom of the coke discharging bin, a waste heat recovery device for absorbing sensible heat installed at the top of the coke collecting bin, a first valve arranged between the coke collecting bin and the coke discharging bin, a second valve connected between the bottom of the coke discharging bin and the scraper, and a coke pusher connected to one side of the coke collecting bin. The coke discharging process is that the hot semi-coke at about 700 DEG C is preliminarily cooled by a water-cooled wall, and the cooled semi-coke is pushed into the coke collecting bin by the coke pusher and is extinguished in the coke collecting bin. The extinguished semi-coke passes through the two electro-hydraulic plug valves between the coke collecting bin and the coke discharging bin and between the coke discharging bin and the scraper, and realizes closed discharge through "one opening and one closing", which has the advantages of effectively saving energy and improving product quality. Although this device can alleviate the environmental problem to some extent and recover part of the sensible heat of semi-coke, the water-cooled wall cooling method is used, and the heat transfer of semi-coke is poor. Only a small part of semi-coke at the periphery can directly contact the water-cooled wall for heat exchange, and the heat exchange area is limited. Therefore, further water spraying or steam injection is still needed for cooling semi-coke, which still produces dirty steam. The semi-coke still contains some moisture, and the water-free semi-coke product cannot be obtained. SUMMARY

[0007] In order to solve the above problems in the prior art, the present application provides a system and method for producing water-free semi-coke from coal. The technical problems to be solved by the present application are solved by the following technical solutions:

[0008] A system for producing water-free semi-coke from coal, comprising:

[0009] a feeding mechanism;

[0010] a pyrolysis furnace, the discharge end of the feeding mechanism corresponding to the feeding end of the pyrolysis furnace;

[0011] a hot semi-coke conveying mechanism, the discharge end of the pyrolysis furnace corresponding to the feeding end of the hot semi-coke conveying mechanism;

[0012] a buffer mechanism, the discharge end of the hot semi-coke conveying mechanism corresponding to the feeding end of the buffer mechanism;

[0013] a cooling furnace, wherein the discharge end of the buffer mechanism corresponds to the feeding end of the cooling furnace.

[0014] In one embodiment of the present application, the pyrolysis furnace comprises a metering device, a pyrolysis furnace coal charging port, a furnace body, a waste heat recovery device and a coke discharging mechanism, wherein,

[0015] The feeding end of the metering device corresponds to the discharge end of the feeding mechanism, the discharge end of the metering device corresponds to the feeding end of the pyrolysis furnace coal charging port, the discharge end of the pyrolysis furnace coal charging port corresponds to the feeding end of the furnace body, the discharge end of the furnace body corresponds to the feeding end of the waste heat recovery device, and the waste heat recovery device is arranged above the coke discharging mechanism.

[0016] In one embodiment of the present application, a raw gas guide pipe is further arranged above the furnace body.

[0017] In one embodiment of the present application, a shell with a central through-hole structure is further included, the hot semi-coke conveying mechanism is arranged in the central through-hole structure of the shell, the shell is a shell with a hollow sandwich layer, and the flue in the furnace body is in communication with the hollow sandwich layer of the shell.

[0018] In one embodiment of the present application, the buffer mechanism comprises a buffer bin, a level meter and a feeding sealing device, wherein,

[0019] The feeding end of the buffer bin corresponds to the discharge end of the hot semi-coke conveying mechanism, the level meter is arranged in the buffer bin, and the feeding sealing device is arranged below the discharge end of the buffer bin.

[0020] In one embodiment of the present application, the system further comprises a gas guide pipe, and the buffer bin is in communication with the raw gas guide pipe through the gas guide pipe.

[0021] In one embodiment of the present application, the cooling furnace comprises a cooling furnace body, a plurality of cooling pipes and a cooling shell, wherein,

[0022] The plurality of cooling pipes are arranged at intervals around the inner wall of the cooling furnace body, the cooling shell is arranged around the outer wall of the cooling furnace body, the cooling shell and the outer wall of the cooling furnace body have a hollow sandwich layer structure, and the hollow sandwich layer structure between the cooling shell and the outer wall of the cooling furnace body is in communication with the outlet end of the cooling pipe.

[0023] One embodiment of the present application further provides a method for producing anhydrous semi-coke by using coal, wherein the anhydrous semi-coke is produced by using the system according to any one of the above embodiments, and the method comprises the following steps:

[0024] The coal of preset particle size is delivered to the pyrolysis furnace by the feeding mechanism, the flue gas generated by mixing the recycled coal gas and combustion air in the pyrolysis furnace is used to heat the coal, so that the coal is converted into semi-coke of a first preset temperature range, and then the semi-coke of the first preset temperature range is converted into semi-coke of a second preset temperature range by the pyrolysis furnace, wherein the first preset temperature range is greater than the second preset temperature range.

[0025] The semi-coke of the second preset temperature range is delivered to the buffer mechanism by the hot semi-coke delivery mechanism, and the buffer mechanism delivers the buffered semi-coke to the cooling furnace.

[0026] The semi-coke delivered by the buffer mechanism is cooled to a third preset temperature range by the cooling furnace, and the semi-coke of the third preset temperature range is obtained.

[0027] In an embodiment of the present application, the coal of preset particle size is delivered to the pyrolysis furnace by the feeding mechanism, the flue gas generated by mixing the recycled coal gas and combustion air in the pyrolysis furnace is used to heat the coal, so that the coal is converted into semi-coke of a first preset temperature range, and then the semi-coke of the first preset temperature range is converted into semi-coke of a second preset temperature range by the pyrolysis furnace, comprising:

[0028] The coal of preset particle size is delivered to the metering device by the feeding mechanism, a preset weight of the coal is weighed by the metering device, and the coal of the preset weight is delivered to the furnace body through the coal charging opening of the pyrolysis furnace.

[0029] The flue gas is released by burning the recycled coal gas and the combustion air in the flue of the furnace body, and the coal in the furnace body is heated by the flue gas, so that the coal is converted into semi-coke of the first preset temperature range, wherein the recycled coal gas is obtained by treating the raw coal gas led out through the raw coal gas leading pipe, and the combustion air is the air stored in the hollow interlayer of the shell.

[0030] The semi-coke of the first preset temperature range enters the waste heat recovery device and is cooled by the waste heat recovery device to obtain semi-coke of the second preset temperature range.

[0031] In an embodiment of the present application, the semi-coke of the second preset temperature range is delivered to the buffer mechanism by the hot semi-coke delivery mechanism, and the buffer mechanism delivers the buffered semi-coke of the second preset temperature range to the cooling furnace, comprising:

[0032] The hot semi-coke is transported into a buffer bin by the semi-coke conveying mechanism, and when the semi-coke in the buffer bin reaches a preset height, a feeding sealing device is opened, and the semi-coke in the buffer bin is transported into the cooling furnace through the feeding sealing device.

[0033] The present application has the following advantages:

[0034] The present application adopts dry quenching, and no quenching wastewater is generated, the system is fully closed, and no VOC organization emission is generated.

[0035] The present application recovers most of the sensible heat of the semi-coke in the pyrolysis furnace waste heat recovery section for reuse, so that the system achieves the effect of energy saving, and the semi-coke is cooled to below 80 DEG C by the cooling furnace which indirectly exchanges heat with water, and the produced anhydrous semi-coke is a clean energy product.

[0036] The present application preheats the combustion-supporting air through the hollow interlayer of the shell of the hot semi-coke conveying mechanism, which recovers part of the sensible heat of the hot semi-coke and cools the hot semi-coke conveying mechanism, thereby ensuring stable operation of the equipment.

[0037] The present application connects the hot semi-coke buffer bin and the raw gas guide pipe through a pipeline, so as to adjust the pressure of the hot semi-coke buffer bin and prevent the raw gas in the pyrolysis furnace from entering the cooling furnace.

[0038] The present application provides a feeding metering device for the pyrolysis furnace, which accurately meters the coal feeding amount to control the amount of recycled gas, thereby realizing automatic control of the system.

[0039] The present application will be further described in detail below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structure schematic diagram of a system for producing anhydrous semi-coke from coal according to an embodiment of the present application;

[0041] Figure 2 is a structure schematic diagram of a pyrolysis furnace according to an embodiment of the present application;

[0042] Figure 3 is a structure schematic diagram of a cooling furnace according to an embodiment of the present application;

[0043] Figure 4 is a flow schematic diagram of a method for producing anhydrous semi-coke from coal according to an embodiment of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS

[0045] Coal preparation process-1; feeding mechanism-2; pyrolysis furnace-3; hot semi-coke conveying mechanism-4; buffer mechanism-5; cooling furnace-6; product recovery system 7; metering device-31; pyrolysis furnace coal charging port-32; raw gas guide pipe-33; furnace body-34; waste heat recovery device-35; coke discharging mechanism-36; buffer bin-51; feed sealing device-52; cooling furnace body-61, cooling pipe-62; cooling shell-63; gear ring-64; rolling ring-65. DETAILED DESCRIPTION

[0046] The application will be described in further detail below with reference to specific embodiments, but the embodiments of the application are not limited thereto.

[0047] Example 1

[0048] See Figure 1 , Figure 1 is a structure schematic diagram of a system for producing anhydrous semi-coke from coal provided by the embodiments of the application. The embodiments of the application provide a system for producing anhydrous semi-coke from coal, which comprises a feeding mechanism 2, a pyrolysis furnace 3, a hot semi-coke conveying mechanism 4, a buffer mechanism 5, and a cooling furnace 6, wherein the discharge end of the feeding mechanism 2 is correspondingly arranged with the feeding end of the pyrolysis furnace 3, the discharge end of the pyrolysis furnace 3 is correspondingly arranged with the feeding end of the hot semi-coke conveying mechanism 4, the discharge end of the hot semi-coke conveying mechanism 4 is correspondingly arranged with the feeding end of the buffer mechanism 5, and the discharge end of the buffer mechanism 5 is correspondingly arranged with the feeding end of the cooling furnace 6.

[0049] Specifically, first, the coal of a preset particle size, for example, 5-50 mm, is prepared by the coal preparation process 1, that is, the coal preparation process 1 realizes the preparation of the raw coal into the coal with the particle size of 5-50 mm; then, the coal of the preset particle size is conveyed to the pyrolysis furnace 3 by the feeding mechanism 2, the flue gas is generated by the mixed combustion of the flue gas and the combustion air in the pyrolysis furnace 3, the heat of the flue gas is used to directly heat the coal in the pyrolysis furnace 3, so that the semi-coke of the first preset temperature range is obtained, for example, the high-temperature flue gas of 1100-1500℃ is generated by the mixed combustion of the flue gas and the combustion air, the high-temperature flue gas of 1100-1500℃ is used to heat the coal, and the semi-coke of the first preset temperature range (for example, the high-temperature semi-coke of 500-800℃) is formed; then, the semi-coke of the first preset temperature range is cooled by the pyrolysis furnace 3, and the semi-coke of the second preset temperature range is obtained after cooling, for example, 200-400℃, then the semi-coke of the second preset temperature range is conveyed to the buffer mechanism 5 by the hot semi-coke conveying mechanism 4 for buffering, when the semi-coke in the buffer mechanism 5 reaches the preset weight, the semi-coke in the buffer mechanism 5 is conveyed to the cooling furnace 6 for cooling, until the semi-coke of the second preset temperature range is cooled to the semi-coke of the third preset temperature range in the cooling furnace 6, then the semi-coke of the third preset temperature range is discharged from the cooling furnace 6, and the preparation of the semi-coke is completed, for example, the third preset temperature range is below 80℃.

[0050] Further, the feeding mechanism 2 is a belt conveyor, a chain bucket conveyor or a bucket elevator, and the feeding mechanism 2 can also be other solid material conveying devices, which are not limited in the embodiment, and the coal of 5-50 mm is conveyed to the top of the pyrolysis furnace 3 by the feeding mechanism 2.

[0051] Further, please refer to Figure 2 , the pyrolysis furnace 3 comprises a metering device 31, a pyrolysis furnace coal charging port 32, a furnace body 34, a waste heat recovery device 35 and a coke discharging mechanism 36 (i.e. a coke pusher), wherein the inlet end of the metering device 31 is correspondingly arranged with the outlet end of the feeding mechanism 2, the outlet end of the metering device 31 is correspondingly arranged with the inlet end of the pyrolysis furnace coal charging port 32, the pyrolysis furnace coal charging port 32 is located below the metering device 31, the outlet end of the pyrolysis furnace coal charging port 32 is correspondingly arranged with the inlet end of the furnace body 34, the furnace body 34 is located below the pyrolysis furnace coal charging port 32, the outlet end of the furnace body 34 is correspondingly arranged with the inlet end of the waste heat recovery device 35, the waste heat recovery device 35 is located below the furnace body 34, and the waste heat recovery device 35 is arranged above the coke discharging mechanism 36.

[0052] Specifically, the feeding mechanism 2 delivers coal into the metering device 31, which weighs the coal. When the weight of the coal meets the requirements, the coal on the metering device 31 can be delivered into the furnace body 34 through the pyrolysis furnace coal charging port 32. The pyrolysis furnace coal charging port 32 can be, for example, a pipeline connecting the metering device 31 and the furnace body 34. A flue (not shown in the figure) is arranged in the furnace body 34, and the flue stores recycled coal gas and combustion air. After the recycled coal gas and the combustion air are burned, a large amount of flue gas is generated, which is used to heat the coal in the furnace body 34. When the coal is converted into semi-coke in the first preset temperature range, the switch door at the bottom of the furnace body 34 is opened, so that the semi-coke in the first preset temperature range enters the inner cavity of the waste heat recovery device 35. The waste heat recovery device 35 can cool the semi-coke in the first preset temperature range, and the semi-coke in the second preset temperature range is obtained after the cooling treatment. Then, the switch door at the bottom of the waste heat recovery device 35 is opened, and the waste heat recovery device 35 delivers the semi-coke in the second preset temperature range to the coke discharging mechanism 36. Then, the coke discharging mechanism 36 delivers the semi-coke in the second preset temperature range to the hot semi-coke conveying mechanism 4. The switch door can be any door that can be opened and closed by control and is suitable for the environment. The present embodiment does not make specific limitations on this. In addition, the coke discharging mechanism 36 can adjust the discharging speed of the semi-coke.

[0053] Further, the metering device 31 can be a belt scale, a metering screw, a loss-in-weight scale, or other weighing and metering equipment.

[0054] In addition, the amount of recycled coal gas can be determined by the amount of coal in the pyrolysis furnace 3 measured by the metering device 31. The amount of recycled coal gas required for different types of coal is indefinite, and those skilled in the art can set it according to actual needs. The present embodiment does not make specific limitations on this.

[0055] Further, the waste heat recovery device 35 is a cavity box, and the inner wall of the box is provided with a membrane water cooling wall. The semi-coke in the first preset temperature range is converted into semi-coke in the second preset temperature range after indirect heat exchange with the desalted water in the membrane water cooling wall. For example, 20-80℃ desalted water is introduced into the membrane water cooling wall, and 500-800℃ high-temperature semi-coke (i.e., semi-coke in the first preset temperature range) is indirectly exchanged with 20-80℃ desalted water to generate 0.2-1.25MPa low-pressure steam, and the temperature of the semi-coke is reduced to 200-400℃ (i.e., semi-coke in the second preset temperature range).

[0056] In addition, the system of the embodiment can further include a raw gas guide pipe 33 arranged above the furnace body 34, the gas inlet end of the raw gas guide pipe 33 being communicated to the furnace body 34, and the raw gas guide pipe 33 being communicated to the chemical production recovery system 7. The raw gas generated in the furnace body 34 during the pyrolysis of the coal includes tar gas, coal gas, water vapor and a small amount of coal dust. Therefore, the raw gas generated during the pyrolysis of the coal can be discharged from the furnace body 34 through the raw gas guide pipe 33. The temperature of the raw gas is generally 70-110°C. In order to fully utilize the raw gas, the raw gas can be guided into the chemical production recovery system 7 through the raw gas guide pipe 33 for relevant treatment in the chemical production recovery process. The chemical production recovery process is a process of washing, cooling and purifying the raw gas containing tar gas, coal gas, water vapor and a small amount of solid coal dust, and finally obtaining coal gas and tar. 20-50% of the coal gas treated through the chemical production recovery process can be guided into the flue in the furnace body 34 through a gas guide pipe as a back-to-furnace gas. In this way, the raw gas can be fully utilized, and the cost and energy can be saved.

[0057] Further, the hot semi-coke conveying mechanism 4 is a conveying device capable of conveying hot semi-coke at 200-400°C. The hot semi-coke conveying mechanism 4 can be a scraper conveyor, a chain bucket conveyor or other high-temperature-resistant solid material conveying device. The hot semi-coke conveying mechanism 4 must be airtight and can withstand a pressure of 100-15000 Pa.

[0058] Preferably, in order to make the hot semi-coke conveying mechanism 4 airtight, the system of the embodiment can further include an outer shell (not shown in the figure) having a central through-hole structure. The hot semi-coke conveying mechanism 4 is arranged in the central through-hole structure of the outer shell. The outer shell is a shell having a hollow sandwich, i.e., the outer shell includes an outer shell body and an inner shell body, and the outer shell body and the inner shell body form a cavity (i.e., a hollow sandwich). The hollow sandwich is filled with air or circulating cooling water. The hollow sandwich of the outer shell can be communicated with, for example, a blower, so that air can be input into the hollow sandwich of the outer shell through the blower. When the hollow sandwich of the outer shell is filled with air, the flue in the furnace body can be communicated with the hollow sandwich of the outer shell through a gas guide pipe. When the hot semi-coke conveying mechanism 4 conveys semi-coke, the heat of the semi-coke can heat the air in the hollow sandwich, so that the air conveyed into the flue can be preheated. The preheated air can be input into the flue through the gas guide pipe communicating the flue with the hollow sandwich of the outer shell, so as to serve as combustion air in the furnace body 34. In this way, not only can the semi-coke be conveyed through the airtight hot semi-coke conveying mechanism 4, but also the air can be fully utilized. The combustion air in the furnace body 34 does not need to be provided by other devices, so that the cost and the floor area occupied by the devices are saved, and the energy is fully utilized.

[0059] Further, the buffer mechanism 5 comprises a buffer bin 51, a level meter (not shown in the figure) and a feeding sealing device 52, wherein the feeding end of the buffer bin 51 is correspondingly arranged with the discharging end of the hot semi-coke conveying mechanism 4, the level meter is arranged in the buffer bin 51, and the feeding sealing device 52 is arranged below the discharging end of the buffer bin 51.

[0060] Specifically, the semi-coke conveyed by the discharging mechanism 36 is conveyed into the buffer bin 51 by the hot semi-coke conveying mechanism 4 for buffering and storage, the height of the semi-coke in the buffer bin 51 is measured by the level meter, and when the height reaches a preset height, the feeding sealing device 52 can be opened, so that the semi-coke in the buffer bin 51 is conveyed into the cooling furnace through the feeding sealing device 52 for cooling.

[0061] Further, the level meter can be a blocking-rotation level meter, a microwave-shooting level meter or a weighing type level meter, and the level meter can also be other devices capable of measuring the height of the semi-coke, which is not limited in the embodiment.

[0062] Further, the feeding sealing device 52 should be able to adjust the feeding speed and has the function of sealing air, so the feeding sealing device 52 can be a star-shaped feeder, a sealing type inclined plug valve, a heavy hammer air lock valve or a double flap valve.

[0063] In addition, the feeding sealing device 52 is connected with the level meter of the buffer bin 51 in a linkage manner, so that the semi-coke in the buffer bin 51 is always above the minimum level, thereby preventing the raw coal gas from flowing into the cooling furnace through the hot semi-coke conveying mechanism 4.

[0064] In addition, the system of the embodiment can further comprise a gas guide pipe (not shown in the figure), and the buffer bin 51 is connected with the raw coal gas guide pipe 33 through the gas guide pipe, because the semi-coke in the buffer bin 51 generally carries a certain amount of coal gas, so in order to balance the pressure, the buffer bin 51 is connected with the raw coal gas guide pipe 33 through a gas guide pipe, so that not only the pressure of the buffer bin 51 is balanced, but also the coal gas in the buffer bin 51 can be recycled through the raw coal gas guide pipe 33.

[0065] Further, referring to Figure 3 , the cooling furnace 6 comprises a cooling furnace body 61, a plurality of cooling pipes 62 and a cooling shell 63, wherein the plurality of cooling pipes 62 are arranged at intervals around the inner wall of the cooling furnace body 61, the cooling shell 63 is arranged around the outer wall of the furnace body, and the cooling shell 63 and the outer wall of the cooling furnace body 61 have a hollow sandwich structure, and the hollow sandwich structure between the cooling shell 63 and the outer wall of the cooling furnace body 61 is connected with the outlet end of the cooling pipe 62.

[0066] Specifically, the inlet end of the cooling pipe 62 is communicated with a device for providing cooling water, so that the device injects cooling water into the cooling pipe 62, and the outlet end of the cooling pipe 62 is also communicated with a hollow interlayer structure between the cooling shell 63 and the outer wall of the cooling furnace body 61, so that the cooling water can also enter the hollow interlayer structure through the cooling pipe 62, and when a drain valve is arranged on the cooling shell 63, the cooling water can be drained through the drain valve, so that when the semi-coke in the buffer bin 51 enters the cooling furnace body 61 through the feeding sealing device 52, the semi-coke with a certain temperature is in the cooling furnace body 61, the circulating cooling water is injected into all the cooling pipes 62 and the cooling shell 63, and the semi-coke in the cooling furnace body 61 is cooled by indirect heat exchange with the circulating cooling water.

[0067] In addition, the cooling furnace 6 can further include a gear ring 64 and two rolling rings 65, the gear ring 64 and the two rolling rings 65 are sleeved on the cooling furnace body 61, the two rolling rings 65 are respectively supported by a supporting roller mechanism and a blocking supporting roller mechanism, and the two rolling rings 65 support the cooling furnace body 61 and an operating weight together; the gear ring 64 is driven by meshing with a pinion on a transmission mechanism.

[0068] The present application adopts dry quenching, no quenching wastewater is generated, the system is fully closed, no VOC organization is discharged, and the production process is environmentally friendly.

[0069] The present application recovers most of the sensible heat of the semi-coke in the pyrolysis furnace waste heat recovery section and reuses the sensible heat, so that the system achieves the effect of energy saving, and the cooling furnace for indirect heat exchange with water cools the semi-coke to below 80 DEG C, and the produced anhydrous semi-coke belongs to a clean energy product.

[0070] The present application preheats the combustion-supporting air through a hollow interlayer sleeved on the shell of the hot semi-coke conveying mechanism, part of the sensible heat of the hot semi-coke is recovered, and the hot semi-coke conveying mechanism can be cooled, so that the stable operation of the equipment is ensured.

[0071] The present application communicates the hot semi-coke buffer bin and the raw gas guide pipe through a pipeline, so that the pressure of the hot semi-coke buffer bin can be adjusted, and the raw gas in the pyrolysis furnace is prevented from entering the cooling furnace.

[0072] The pyrolysis furnace of the present application is provided with a feeding metering device, the amount of coal is accurately metered, the amount of gas is controlled, and the automatic control of the system is realized.

[0073] Embodiment two

[0074] Please see Figure 4 , Figure 4 is a flowchart of a method for producing anhydrous semi-coke from coal provided by the embodiment of the present application. The embodiment provides a method for producing anhydrous semi-coke from coal on the basis of the above-mentioned embodiment, and the method comprises the following steps:

[0075] Step 1, using the feeding mechanism 2 to deliver the coal of preset particle size into the pyrolysis furnace 3, the flue gas generated by mixing the recycled gas and combustion air in the pyrolysis furnace 3 heats the coal, so that the coal is converted into semi-coke of the first preset temperature range, and then the semi-coke of the first preset temperature range is converted into semi-coke of the second preset temperature range by the pyrolysis furnace 3, wherein the first preset temperature range is greater than the second preset temperature range.

[0076] Step 1.1, using the feeding mechanism 2 to deliver the coal of preset particle size into the metering device 31, and weighing the coal of preset weight by the metering device 31, and delivering the coal of preset weight into the furnace body 34 through the pyrolysis furnace coal charging port 32.

[0077] Specifically, the raw coal is converted into coal of preset particle size (such as 5-50 mm) by the coal preparation process 1, and the coal of 5-50 mm particle size is delivered into the metering device 31 at the top of the furnace body 34 by the feeding mechanism 2, and then the coal of preset weight is loaded into the furnace body 34 through the pyrolysis furnace coal charging port 32.

[0078] Step 1.2, releasing flue gas by burning the recycled gas and combustion air in the flue of the furnace body 34, and heating the coal in the furnace body 34 by the flue gas, so that the coal is converted into semi-coke of the first preset temperature range, wherein the recycled gas is the gas obtained by treating the raw gas led out through the raw gas guide pipe 33, and the combustion air is the air stored in the hollow layer of the shell.

[0079] Specifically, the furnace body 34 is provided with a flue, the recycled gas and the combustion air are mixed in the flue, and the high-temperature hot flue gas of 1100-1500℃ generated after combustion directly heats the coal in the furnace body 34, so that the coal is converted into semi-coke of the first preset temperature range, and the first preset temperature range is 500-800℃. The coal pyrolysis generates raw gas containing tar gas, coal gas, water vapor and a small amount of coal dust, which is led out of the furnace body 34 from the raw gas guide pipe 33 at the top of the furnace body 34, and the raw gas with a temperature of 70-110℃ is sent to the production recovery system 7 for related treatment in the production recovery process. The production recovery process is to wash, cool and purify the raw gas containing tar gas, coal gas, water vapor and a small amount of solid coal dust, and finally obtain coal gas and tar. The combustion air is obtained by leading the air in the hollow layer of the shell into the flue.

[0080] Step 1.3, the semi-coke of the first preset temperature range enters the waste heat recovery device 35 and is cooled by the waste heat recovery device 35 to obtain semi-coke of the second preset temperature range, wherein the second preset temperature is for example 200-400℃.

[0081] Step 2, the semi-coke in the second preset temperature range is transported into the buffer mechanism 5 by the hot semi-coke transporting mechanism 4, and the semi-coke buffered in the buffer mechanism 5 is transported into the cooling furnace 6.

[0082] Specifically, the semi-coke is transported into the buffer bin 51 by the hot semi-coke transporting mechanism 4, and when the semi-coke in the buffer bin 51 reaches a preset height measured by a material level meter, the feeding sealing device 52 is opened, and the semi-coke in the buffer bin 51 is transported into the cooling furnace 6 through the feeding sealing device 52.

[0083] Step 3, the semi-coke buffered by the buffer mechanism is cooled to a third preset temperature range, for example, 80℃ or below, in the cooling furnace to obtain semi-coke in the third preset temperature range.

[0084] Further, the semi-coke in the temperature range of 200-400℃ is indirectly exchanged with the circulating cooling water in the cooling pipe 62 and the cooling shell 63 in the cooling furnace 6, and the temperature is reduced to 80℃ or below before being discharged out of the system.

[0085] Example Three

[0086] This embodiment introduces the method for producing anhydrous semi-coke from coal in a specific embodiment based on the above-mentioned embodiments. The method for producing anhydrous semi-coke from coal can specifically include:

[0087] (1) The raw coal is transported into the buffer bin 51 by the hot semi-coke transporting mechanism 4, and when the semi-coke in the buffer bin 51 reaches a preset height measured by a material level meter, the feeding sealing device 52 is opened, and the semi-coke in the buffer bin 51 is transported into the cooling furnace 6 through the feeding sealing device 52.

[0088]

[0089] (2) The coal in the particle size range of 5-20mm is transported to the metering device at the top of the pyrolysis furnace by the belt conveyor, the metering device is a belt scale, and the coal is loaded into the furnace body of the pyrolysis furnace through the coal loading port of the pyrolysis furnace.

[0090] (3) The furnace body of the pyrolysis furnace is provided with a flue, the furnace gas is mixed with the combustion air in the flue, and the high-temperature hot flue gas of 1100℃ generated after combustion directly heats the coal in the furnace body of the pyrolysis furnace. The furnace gas is 37% of the self-produced gas obtained after the raw gas is subjected to the chemical production and recovery process.

[0091] (4) The coal pyrolysis generates raw gas containing tar gas, coal gas, water vapor and a small amount of coal dust, and the outlet gas temperature is 70℃. The raw gas is guided from the raw gas guide pipe at the top of the furnace body of the pyrolysis furnace to the chemical production and recovery system.

[0092] (5) The raw gas containing tar gas, coal gas, water vapor and a small amount of solid coal dust is washed, cooled and purified in the chemical production and recovery system, and finally coal gas and tar are obtained. The composition of the coal gas is as follows:

[0093]

[0094]

[0095] Tar index as follows:

[0096] No. Test item Unit Test result 1 Density (20°C) g / cm 3 ]] 1.048 2 Toluene insolubles (anhydrous basis), coked products ％ 1.5 3 Naphthalene ％ 0.23 4 Ash ％ 0.04 5 Moisture ％ 4.6 6 Phenol ％ 10.46 7 Asphalt ％ 36.14 8 Pyridine ％ 2.21 9 Anthracene ％ 1.65 10 Sulfur ％ 0.12 11 Kinematic viscosity (80°C) mPa.S 1.89 12 Calorific value Kcal / kg 9000

[0097] (6) The high-temperature semi-coke at 500℃ generated by coal pyrolysis enters the waste heat recovery device of the pyrolysis furnace, and the temperature of the semi-coke is reduced to 200℃ by the waste heat recovery device, and then the semi-coke is discharged into the hot semi-coke conveying mechanism through the discharging mechanism. The discharging mechanism can adjust the discharging speed of the hot semi-coke, so that the coal stays in the pyrolysis furnace for 6 hours. The hot semi-coke conveying mechanism adopts a chain bucket conveyor, and the outer shell of the chain bucket conveyor adopts a hollow sandwich form. Normal temperature air is introduced into the sandwich, and the normal temperature air is preheated and used as combustion air of the pyrolysis furnace.

[0098] (7) The hot semi-coke conveying mechanism sends the hot semi-coke at 200℃ to the buffer bin, and the buffer bin is provided with a level meter to detect the level height of the buffer bin. The buffer bin is connected with the raw gas guide pipe of the pyrolysis furnace through the guide pipe, so that the pressure in the buffer bin can be adjusted to prevent the raw gas in the pyrolysis furnace from entering the cooling furnace.

[0099] (8) The hot semi-coke in the buffer bin is discharged into the cooling furnace through the feeding sealing device. The feeding sealing device is connected with the buffer bin level, and the buffer bin level is always controlled to be above the lowest level, so as to prevent the raw gas from entering the cooling furnace through the hot semi-coke conveying process.

[0100] (9) The hot semi-coke at 200℃ is indirectly heated with the cooling pipe and the 20℃ circulating cooling water in the cooling shell in the cooling furnace, and then the temperature is reduced to below 60℃ and discharged out of the system. The semi-coke index is shown in the following table:

[0101] No. Test item Analysis result 1 Moisture Mad% 0.02 2 Ash Ad% 6 3 Volatile matter Vdaf% 8 4 Received base low heat value Qnet,ar 7210 Kcal / kg

[0102] Example four

[0103] This embodiment introduces the method for producing anhydrous semi-coke from coal according to another specific embodiment based on the above-mentioned embodiments. The method for producing anhydrous semi-coke from coal can specifically include:

[0104] (1) The raw coal is sent to the coal preparation process to obtain coal with a particle size of 10-30mm, and the coal quality analysis index is as shown in the following table:

[0105]

[0106] (2) The coal with a particle size of 10-30mm is sent to the metering device at the top of the pyrolysis furnace by the belt conveyor, the metering device is a loss-in-weight scale, and the coal is loaded into the furnace body of the pyrolysis furnace through the coal loading port of the pyrolysis furnace.

[0107] (3) The flue is arranged in the furnace body of the pyrolysis furnace, the recycled gas is mixed with the combustion air in the flue, and the high-temperature hot flue gas at 1200°C generated after combustion directly heats the coal in the pyrolysis furnace. The recycled gas is 50% of the self-produced gas obtained after the raw coal gas is subjected to the production recovery process.

[0108] (4) The coal pyrolysis generates the raw coal gas containing tar gas, coal gas, water vapor and a small amount of coal dust, and the out-gas temperature is 80°C. The raw coal gas is guided from the raw coal gas guide pipe at the top of the pyrolysis furnace to the production recovery process.

[0109] (5) The production recovery process washes, cools and purifies the raw coal gas containing tar gas, coal gas, water vapor and a small amount of solid coal dust, and finally obtains the coal gas and tar. The composition of the coal gas is as follows:

[0110] Component CO2 CO [H2] CH4 [N2] O2 CmHn Volume percentage % 6.19 11.6 30.8 6.54 43.82 0.43 0.62

[0111] The tar index is as follows:

[0112]

[0113]

[0114] (6) The high-temperature semi-coke at 550°C generated by the coal pyrolysis enters the waste heat recovery device of the pyrolysis furnace, the temperature of the semi-coke is reduced to 250°C through the waste heat recovery device, and then the semi-coke is discharged into the hot semi-coke conveying mechanism through the discharging mechanism. The discharging mechanism can adjust the discharging speed of the hot semi-coke, so that the coal stays in the pyrolysis furnace for 7 hours. The hot semi-coke conveying mechanism adopts a scraper conveyor, and the outer shell of the scraper conveyor adopts a hollow sandwich form. Normal temperature air is introduced into the sandwich, and the normal temperature air is preheated and used as the combustion air of the pyrolysis furnace.

[0115] (7) The hot semi-coke conveying mechanism sends the hot semi-coke at 250°C to the buffer bin, and the buffer bin is provided with a material level meter to detect the material level height of the buffer bin. The buffer bin is communicated with the raw coal gas guide pipe through the guide pipe, so that the pressure in the buffer bin can be adjusted to prevent the raw coal gas in the pyrolysis furnace from entering the cooling furnace.

[0116] (8) The hot semi-coke in the buffer bin is discharged into the cooling furnace through the feeding sealing device. The feeding sealing device is connected with the buffer bin material level, so that the material level of the buffer bin is always above the lowest material level, thereby preventing the raw coal gas from entering the cooling furnace through the hot semi-coke conveying mechanism.

[0117] (9) The hot semi-coke at 250°C is indirectly heated with the cooling pipe and the 30°C circulating cooling water in the cooling shell in the cooling furnace, and then the temperature is reduced to below 70°C and discharged out of the system. The semi-coke index is shown in the following table:

[0118] No. Test item Analysis result 1 Moisture Mad% 0.06 2 Ash Ad% 6.1 3 Volatile matter Vdaf% 7 4 Received base low heat value Qnet,ar 7260 Kcal / kg

[0119] Example Five

[0120] This example introduces the method for producing anhydrous semi-coke from coal in another specific embodiment based on the above examples. The method for producing anhydrous semi-coke from coal can specifically include:

[0121] (1) The raw coal is passed through the coal preparation process to obtain coal with a particle size of 20-40 mm, and the coal quality analysis indexes are as follows:

[0122]

[0123] (2) The coal with a particle size of 20-40 mm is sent to the metering device at the top of the pyrolysis furnace by the belt conveyor, and the metering device is a screw metering device, which is loaded into the furnace body of the pyrolysis furnace through the coal loading port of the pyrolysis furnace.

[0124] (3) The furnace body of the pyrolysis furnace is provided with a flue, and the furnace gas is mixed with the combustion air in the flue, and the high-temperature hot flue gas of 1365°C generated after combustion directly heats the coal in the furnace body of the pyrolysis furnace. The furnace gas is 20% of the self-produced gas obtained after the raw gas is subjected to the chemical production and recovery process.

[0125] (4) The coal pyrolysis generates raw gas containing tar gas, coal gas, water vapor and a small amount of coal dust, and the outlet gas temperature is 90°C. The raw gas is guided from the raw gas guide pipe at the top of the pyrolysis furnace to the chemical production and recovery process.

[0126] (5) The chemical production and recovery process washes, cools and purifies the raw gas containing tar gas, coal gas, water vapor and a small amount of solid coal dust, and finally obtains coal gas and tar. The composition of the coal gas is as follows:

[0127] Component CO2 CO [H2] CH4 [N2] O2 CmHn Volume percentage % 6.21 14.6 26.8 10.54 40.82 0.2 0.83

[0128] The tar indexes are as follows:

[0129] No. Test item Unit Test result 1 Density (20°C) g / cm 3 ]] 1.06 2 Toluene insolubles (anhydrous basis), coked products ％ 2.1 3 Naphthalene ％ 0.21 4 Ash ％ 0.09 5 Moisture ％ 3.4 6 Phenol ％ 8.23 7 Asphalt ％ 32.11 8 Pyridine ％ 2.26 9 Anthracene ％ 1.8 10 Sulfur ％ 0.14 11 Kinematic viscosity (80°C) mPa.S 2

[0130] (6) The high-temperature semi-coke of 610°C generated by the coal pyrolysis enters the waste heat recovery device of the pyrolysis furnace, and the temperature of the semi-coke is reduced to 311°C by the waste heat recovery device, and then discharged into the hot semi-coke conveying mechanism by the discharging mechanism. The discharging mechanism can adjust the discharging speed of the hot semi-coke, so that the coal stays in the pyrolysis furnace for 8 hours. The hot semi-coke conveying mechanism adopts a buried scraper conveyor, and the outer shell of the buried scraper conveyor adopts a hollow sandwich form. The sandwich is filled with normal temperature air, which is preheated and used as combustion air for the pyrolysis furnace.

[0131] (7) The hot semi-coke conveying mechanism sends the 310℃ hot semi-coke to the buffer bin, which is provided with a material level meter to detect the material level height of the buffer bin. The buffer bin is connected with the raw gas guide pipe to adjust the pressure in the buffer bin and prevent the raw gas in the pyrolysis furnace from entering the cooling furnace.

[0132] (8) The hot semi-coke in the buffer bin is discharged into the cooling furnace through the feeding sealing device. The feeding sealing device is connected with the buffer bin material level to control the buffer bin material level to be always above the lowest material level, preventing the raw gas from entering the cooling furnace through the hot semi-coke conveying mechanism.

[0133] (9) The 310℃ hot semi-coke is indirectly exchanged with the 32℃ circulating cooling water in the cooling pipe and the cooling shell in the cooling furnace, and the temperature is reduced to below 75℃ to be discharged out of the system. The semi-coke indexes are shown in the following table:

[0134] No. Test item Analysis result 1 Moisture Mad% 0.03 2 Ash Ad% 9 3 Volatile matter Vdaf% 6 4 Received base low heat value Qnet,ar 6790 Kcal / kg

[0135] Example Six

[0136] This example introduces the method for producing anhydrous semi-coke from coal in another specific embodiment based on the above-mentioned embodiments. The method for producing anhydrous semi-coke from coal can specifically include:

[0137] (1) The raw coal is sent to the coal preparation process to obtain coal with a particle size of 30-50mm, and the coal quality analysis indexes are shown in the following table:

[0138]

[0139] (2) The coal with a particle size of 30-50mm is sent to the metering device at the top of the pyrolysis furnace by the belt conveyor, the metering device is a belt scale, and the coal is loaded into the furnace body through the coal loading port of the pyrolysis furnace.

[0140] (3) The furnace body of the pyrolysis furnace is provided with a flue, the furnace gas is mixed with the combustion air in the flue, and the high-temperature hot flue gas with a temperature of 1470℃ generated after combustion directly heats the coal in the furnace body. The furnace gas is 33% of the self-produced gas obtained after the raw gas is subjected to the chemical production and recovery process.

[0141] (4) The coal pyrolysis generates raw gas containing tar gas, coal gas, water vapor and a small amount of coal dust, and the outlet gas temperature is 110℃. The raw gas is guided to the chemical production and recovery process through the raw gas guide pipe at the top of the pyrolysis furnace.

[0142] (5) The raw gas containing tar gas, coal gas, water vapor and a small amount of solid coal dust is washed, cooled and purified in the chemical production and recovery process to obtain coal gas and tar. The composition of the coal gas is as follows:

[0143] Component CO2 CO [H2] CH4 [N2] O2 CmHn Volume percentage % 7.62 13.1 30.1 6.43 42.1 0.22 0.43

[0144] Tar index as follows:

[0145] No. Test item Unit Test result 1 Density (20°C) g / cm 3 ]] 1.1 2 Toluene insolubles (anhydrous basis), coked products ％ 2.18 3 Naphthalene ％ 0.24 4 Ash ％ 0.11 5 Moisture ％ 2.3 6 Phenol ％ 7.21 7 Asphalt ％ 33.17 8 Pyridine ％ 2.29 9 Anthracene ％ 1.9 10 Sulfur ％ 0.34 11 Kinematic viscosity (80°C) mPa.S 2.05

[0146] (6) The high-temperature semi-coke at 800 DEG C generated by coal pyrolysis enters the waste heat recovery device of the pyrolysis furnace, and the temperature of the semi-coke is reduced to 400 DEG C by the waste heat recovery device, and then the semi-coke is discharged into the hot semi-coke conveying mechanism by the discharging mechanism. The discharging mechanism can adjust the discharging speed of the hot semi-coke, so that the coal stays in the pyrolysis furnace for 9 hours. The hot semi-coke conveying mechanism adopts a chain bucket conveyor, and the outer shell of the chain bucket conveyor adopts a hollow sandwich form, and normal temperature air is introduced into the sandwich, and the normal temperature air is preheated and used as combustion air of the pyrolysis furnace.

[0147] (7) The hot semi-coke conveying mechanism sends the 400 DEG C hot semi-coke to the buffer bin, and the buffer bin is provided with a material level meter, which can detect the material level height of the buffer bin. The buffer bin is communicated with the raw gas guide pipe through the guide pipe, so that the pressure in the buffer bin can be adjusted, and the raw gas in the pyrolysis furnace is prevented from entering the cooling furnace.

[0148] (8) The hot semi-coke in the buffer bin is discharged into the cooling furnace through the feeding sealing device. The feeding sealing device is connected with the buffer bin material level, and the buffer bin material level is always controlled to be above the lowest material level, so that the raw gas is prevented from entering the cooling furnace through the hot semi-coke conveying mechanism.

[0149] (9) The 400 DEG C hot semi-coke is indirectly exchanged with the cooling pipe and the 35 DEG C circulating cooling water in the cooling shell in the cooling furnace, and then the temperature is reduced to below 80 DEG C and discharged out of the system. The semi-coke index is shown in the following table:

[0150] No. Test item Analysis result 1 Moisture Mad% 0.02 2 Ash Ad% 10.1 3 Volatile matter Vdaf% 5 4 Received base low heat value Qnet,ar 6890 Kcal / kg

[0151] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0152] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0153] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0154] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or data point described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or data points described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0155] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A system for producing anhydrous semicoke from coal, characterized by, The system comprises: a feeding mechanism for conveying coal with a particle size of 10-50 mm, the feeding mechanism being a belt conveyor, a chain bucket conveyor or a bucket elevator; a pyrolysis furnace comprising a metering device, a pyrolysis furnace coal charging port, a furnace body, a waste heat recovery device, a coke discharging mechanism and a raw coal gas guide pipe, wherein the inlet end of the metering device is arranged correspondingly to the outlet end of the feeding mechanism, the outlet end of the metering device is arranged correspondingly to the inlet end of the pyrolysis furnace coal charging port, the outlet end of the pyrolysis furnace coal charging port is arranged correspondingly to the inlet end of the furnace body, the furnace body is used to generate flue gas at 1100-1500°C to heat coal with a particle size of 10-50 mm and convert the coal into semi-coke at 500-800°C, the outlet end of the furnace body is arranged correspondingly to the inlet end of the waste heat recovery device and the waste heat recovery device is located below the furnace body, the waste heat recovery device is a box with a cavity, the inner wall of the box is provided with a membrane water cooling wall, which is used to convert semi-coke at 500-800°C into semi-coke at 200-400°C by indirect heat exchange with desalted water at 20-80°C in the membrane water cooling wall, while generating low-pressure steam at 0.2-1.25 MPa, the raw coal gas guide pipe is arranged above the furnace body and is used to guide raw coal gas at 70-110°C into a chemical production recovery system for chemical production recovery process treatment, the coal gas treated by the chemical production recovery process is guided into the furnace body through a guide pipe, and the waste heat recovery device is arranged above the coke discharging mechanism, the metering device being a belt scale, a metering screw or a loss-in-weight scale; a hot semi-coke conveying mechanism, the outlet end of the pyrolysis furnace being arranged correspondingly to the inlet end of the hot semi-coke conveying mechanism, the system further comprising an outer shell with a central through-hole structure, the hot semi-coke conveying mechanism being arranged in the central through-hole structure of the outer shell, the outer shell being a shell with a hollow sandwich, the hollow sandwich being in communication with a flue of the furnace body and being used to make air filled in the hollow sandwich preheated by semi-coke and then input into the flue as combustion air of the furnace body, the hot semi-coke conveying mechanism being a chain bucket conveyor or a scraper conveyor with a closed structure to withstand a pressure of 100-15000 Pa; a buffer mechanism comprising a buffer bin, a level meter and a feeding sealing device, wherein the inlet end of the buffer bin is arranged correspondingly to the outlet end of the hot semi-coke conveying mechanism, the level meter is arranged in the buffer bin, the feeding sealing device is arranged below the outlet end of the buffer bin and is connected to the level meter, which is used to open the sealing device when the semi-coke reaches a preset height to make the semi-coke in the buffer bin conveyed into a cooling furnace through the feeding sealing device for cooling, while controlling the semi-coke in the buffer bin to be above the lowest level, the buffer bin being in communication with the raw coal gas guide pipe through a guide pipe, the level meter being a rotary resistance level meter, a microwave level meter or a load cell level meter, and the feeding sealing device being a star-shaped feeder, a sealing type inclined flap valve, a heavy hammer air lock valve or a double flap valve. A cooling furnace is arranged at the outlet end of the buffer mechanism; the cooling furnace is a horizontal rotary cooling furnace, which comprises a cooling furnace body, a plurality of cooling pipes and a cooling shell, wherein the plurality of cooling pipes are arranged at intervals around the inner wall of the cooling furnace body, the cooling shell is arranged around the outer wall of the cooling furnace body, and the cooling shell and the outer wall of the cooling furnace body have a hollow interlayer structure, and the hollow interlayer structure between the cooling shell and the outer wall of the cooling furnace body is communicated with the outlet end of the cooling pipe; a gear ring and a rolling ring are arranged on the cooling furnace body, and the gear ring is driven by a transmission mechanism; the semi-coke enters the cooling furnace body from the inlet in a horizontal direction and is cooled to below 60℃, and the semi-coke discharged from the cooling furnace body is anhydrous semi-coke with a moisture content of less than or equal to 0.06%.

2. A method of producing anhydrous char from coal, characterized by, The system of claim 1 is used to produce anhydrous semi-coke, and the method comprises: The feeding mechanism is used to deliver 10-50mm coal into a pyrolysis furnace, the back-furnace gas in the pyrolysis furnace is mixed with combustion air to generate 1100-1500℃ flue gas to heat the 10-50mm coal, so that the coal is converted into 500-800℃ semi-coke, and then the 500-800℃ semi-coke is cooled by the waste heat recovery device of the pyrolysis furnace to be converted into 200-400℃ semi-coke; the back-furnace gas is the gas obtained by treating the raw gas led out through the raw gas guide pipe, and the combustion air is the air preheated by the semi-coke in the hollow interlayer of the hot semi-coke conveying mechanism shell; The hot semi-coke conveying mechanism is used to deliver the 200-400℃ semi-coke into the buffer mechanism for buffering, and the air in the hollow interlayer of the hot semi-coke conveying mechanism shell is preheated by the semi-coke to be used as combustion air; The buffer mechanism measures the height of the semi-coke in the buffer bin by a level meter, opens the feeding sealing device when the height of the semi-coke reaches a preset height, delivers the semi-coke in the buffer bin into the cooling furnace for cooling, controls the semi-coke in the buffer bin to be always above the lowest level, and leads the raw gas in the buffer mechanism into the raw gas guide pipe; The cooling furnace is used to cool the semi-coke delivered by the buffer mechanism to below 60℃ to obtain semi-coke with a moisture content of less than or equal to 0.06%.

3. The method of claim 2, wherein, The feeding mechanism is used to deliver 10-50mm coal into a pyrolysis furnace, the back-furnace gas in the pyrolysis furnace is mixed with combustion air to generate 1100-1500℃ flue gas to heat the 10-50mm coal, so that the coal is converted into 500-800℃ semi-coke, and then the 500-800℃ semi-coke is cooled by the waste heat recovery device of the pyrolysis furnace to be converted into 200-400℃ semi-coke, comprising: The feeding mechanism is used to deliver 10-50mm coal into a metering device, the metering device is used to weigh the coal, and the coal is delivered into the furnace body through the coal charging opening of the pyrolysis furnace; The flue gas of 1100-1500 DEG C is released by burning the backset gas in the flue of the furnace body and the combustion air, the coal in the furnace body is heated by the flue gas, so that the coal is converted into semi-coke of 500-800 DEG C, wherein the backset gas is the gas obtained by treating the raw coal gas led out through the raw coal gas leading pipe, and the combustion air is the air preheated by the semi-coke in the hollow interlayer of the shell. The semi-coke of 500-800 DEG C enters the waste heat recovery device, and is cooled in the waste heat recovery device to obtain semi-coke of 200-400 DEG C.

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