Pulverized Coal Dry Distillation Equipment and Method

Abstract

This application provides a pulverized coal dry distillation apparatus and method. The pulverized coal dry distillation apparatus includes: a pyrolysis tower and a regeneration tower; a first conveying device connected to the pyrolysis tower for conveying pulverized coal into the pyrolysis tower; a second conveying device, connected to the pyrolysis tower and the regeneration tower, for conveying hot semi-coke produced in the pyrolysis tower to the regeneration tower; a third conveying device, connected to the pyrolysis tower and the third conveying device, for conveying fluidizing gas into the pyrolysis tower; a fourth conveying device, connected to the regeneration tower and the fourth conveying device, for conveying a gasifying agent into the regeneration tower; and a fifth conveying device, connected to the regeneration tower and the pyrolysis tower, for conveying high-temperature semi-coke produced in the regeneration tower to the pyrolysis tower. This application aims to solve the technical problem of low semi-coke utilization efficiency after pulverized coal pyrolysis in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulverized coal utilization, in particular to a pulverized coal dry distillation device and method. BACKGROUND

[0002] China is rich in coal resources, which is still an important primary energy at the present stage. How to efficiently utilize the complex coal has been an important issue in the field. With the continuous development of science and technology, the overall utilization of coal is developing from "rough eating" to precision and refinement. Coal pyrolysis is a production process born in this development process. From a technical point of view, pyrolysis is the most scientific and reasonable way for clean and efficient utilization of low-rank coal, and is the only way for coal utilization to change from "rough eating" to "delicate eating". First, it can effectively improve the resource utilization efficiency: low-rank coal is a large molecular aggregate formed by condensation of functional groups such as aromatic rings and aliphatic chains. Direct combustion will form a large amount of CO. If gasification treatment still has the problem of excessive splitting of the original material, high-value components will be converted into the most basic synthesis gas CO and H2. Through pyrolysis, the tar in the coal can be extracted, and pyrolysis gas and semi-coke can be produced, which can divide the raw coal into three parts and avoid resource waste. Second, the production process conditions are mild. The temperature of low-temperature pyrolysis of coal is generally 550-700℃, the reaction pressure is close to normal pressure, and air isolation heating is used. Third, it has good environmental protection. The semi-coke obtained by coal pyrolysis can be used as boiler fuel and gasification raw material, and contains much less pollutants than raw coal, which has less impact on the environment. Therefore, coal pyrolysis has become the main process for efficient utilization of coal.

[0003] Coal pyrolysis is divided into high-temperature pyrolysis and medium-low-temperature pyrolysis. Among them, medium-low-temperature pyrolysis is the decomposition of coal into gas (pyrolysis gas), liquid coal tar and solid semi-coke three-phase materials under the condition of air isolation or oxygen deficiency through medium-low-temperature dry distillation (pyrolysis), which is an important way to realize the quality utilization and clean and efficient conversion of coal, and also the most challenging field of coal pyrolysis.

[0004] However, the hot semi-coke obtained by pyrolysis of pulverized coal has low utilization efficiency as fuel or raw material. SUMMARY

[0005] The present application provides a pulverized coal dry distillation device and method, which aims to solve the technical problem of low utilization efficiency of hot semi-coke obtained by pyrolysis of pulverized coal in the prior art.

[0006] The present application provides a pulverized coal dry distillation device, which comprises:

[0007] a pyrolysis tower and a regeneration tower;

[0008] a first conveying device, which is connected with the pyrolysis tower and used for conveying pulverized coal into the pyrolysis tower;

[0009] a second conveying device, the pyrolysis tower and the regeneration tower being connected by the second conveying device, for conveying the hot semi-coke produced in the pyrolysis tower into the regeneration tower;

[0010] a third conveying device, the pyrolysis tower being connected with the third conveying device, for conveying fluidizing gas into the pyrolysis tower;

[0011] a fourth conveying device, the regeneration tower being connected with the fourth conveying device, for conveying gasifying agent into the regeneration tower;

[0012] a fifth conveying device, the regeneration tower and the pyrolysis tower being connected by the fifth conveying device, for conveying the high-temperature semi-coke produced in the regeneration tower into the pyrolysis tower.

[0013] Optionally, the second conveying device comprises a first conveying pipe, an input end of the first conveying pipe being connected with a bottom of the pyrolysis tower, for discharging the hot semi-coke from the bottom of the pyrolysis tower; an output end of the first conveying pipe being connected with a middle upper portion of the regeneration tower, for discharging the hot semi-coke into the middle upper portion of the regeneration tower.

[0014] Optionally, the second conveying device further comprises a first conveying valve, the first conveying valve being arranged on the first conveying pipe, the first conveying valve being connected with a gas supply device, for controlling a conveying speed of the hot semi-coke.

[0015] Optionally, the middle upper portion of the regeneration tower is provided with a second high-temperature semi-coke outlet and a hot semi-coke inlet arranged at the same height, the output end of the first conveying pipe being in communication with the hot semi-coke inlet, the second high-temperature semi-coke outlet being in communication with a semi-coke discharging pipe, for discharging a part of the hot semi-coke out of the regeneration tower.

[0016] Optionally, the fifth conveying device comprises a second conveying pipe, an input end of the second conveying pipe being connected with a bottom of the regeneration tower, for discharging the high-temperature semi-coke from the bottom of the pyrolysis tower; an output end of the second conveying pipe being connected with a middle portion of the pyrolysis tower, for discharging the high-temperature semi-coke into the middle portion of the pyrolysis tower.

[0017] Optionally, the second conveying device further comprises a second conveying valve, the second conveying valve being arranged on the second conveying pipe, the second conveying valve being connected with a second external gas supply device, for controlling a conveying speed of the hot semi-coke.

[0018] The application further provides a pulverized coal dry distillation method, comprising the following steps:

[0019] inputting pulverized coal into the pyrolysis tower through a first conveying device;

[0020] conveying high-temperature semi-coke produced in the regeneration tower into the pyrolysis tower through a second conveying device;

[0021] delivering fluidizing gas into the pyrolysis tower through a third conveying device,

[0022] in the pyrolysis tower, the pulverized coal, the high-temperature semi-coke and the fluidizing gas are mixed and boil, and tar, pyrolysis gas and hot semi-coke are generated;

[0023] delivering gasifying agent into the regeneration tower through a fourth conveying device;

[0024] delivering the hot semi-coke into the regeneration tower through a fifth conveying device;

[0025] in the regeneration tower, the temperature of the pyrolyzed semi-coke is raised to a preset temperature, so that the semi-coke becomes high-temperature semi-coke, and the high-temperature semi-coke is delivered into the pyrolysis tower through the third conveying device.

[0026] Optionally, the preset temperature is 700-1000℃.

[0027] Optionally, a first control gas is injected into the pyrolysis tower from the bottom of the pyrolysis tower through a first control gas conveying pipe.

[0028] Optionally, a second control gas is injected into the regeneration tower from the bottom of the regeneration tower through a second control gas conveying pipe.

[0029] In the technical solution of the present application, the high-temperature semi-coke / hot semi-coke is circulated uninterruptedly through the connection of the second conveying device and the fifth conveying device between the pyrolysis tower and the regeneration tower, so that the dry distillation reaction of the pulverized coal proceeds smoothly, and the hot semi-coke generated in the dry distillation of the pulverized coal is used efficiently. In the technical solution of the present application, the fluidizing gas is delivered into the pyrolysis tower through the third conveying device, so that the pulverized coal is rapidly dry-distilled under the circulation of the high-temperature semi-coke and the participation of the fluidizing gas, and the tar yield of the pulverized coal is greatly improved. The gasifying agent is delivered into the regeneration tower through the fourth conveying device, so that the hot semi-coke is changed into high-temperature semi-coke under the action of the gasifying agent, which is used as the medium in the pyrolysis tower.

[0030] Compared with the prior art, the technical solution of the present application fully couples the high-temperature semi-coke, the hot semi-coke and the gasification technology. In the regeneration tower, the hot semi-coke is changed into high-temperature semi-coke by high temperature and gasifying agent, which is used in the pyrolysis tower. In the pyrolysis tower, the pulverized coal and the high-temperature semi-coke are directly pyrolyzed and gasified under the action of the fluidizing gas. In the technical solution of the present application, the high-temperature semi-coke and the fluidizing gas are coupled in the pyrolysis tower, and the hot semi-coke and the gasifying agent are coupled in the regeneration tower, so that the efficient pyrolysis and gasification of the pulverized coal are realized in stages and in different places, the energy consumption is greatly reduced, the hot semi-coke generated in the pyrolysis of the pulverized coal is used efficiently, and the utilization efficiency of the pulverized coal is maximized. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0032] Figure 1 is a structural schematic diagram of a pulverized coal dry distillation device provided in the embodiments of the present application;

[0033] Figure 2 is a structural schematic diagram of a pyrolysis tower in the pulverized coal dry distillation device provided in the embodiments of the present application;

[0034] Figure 3 is a structural schematic diagram of a regeneration tower in the pulverized coal dry distillation device provided in the embodiments of the present application.

[0035] Legend of reference signs

[0036]

[0037] DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0039] In the description of the present application, it should be understood that the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship 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 device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0040] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. Details are set forth in the following description for purpose of explanation. It should be appreciated that one of ordinary skill in the art will readily recognize that the application can be practiced without the use of these specific details. In other instances, well-known structures and processes have not been described in detail in order to avoid obscuring the description of the application. Thus, the present application is not intended to be limited by the embodiments shown, but is to be accorded with the widest scope consistent with the principles and features disclosed herein.

[0041] Medium-low temperature pyrolysis is an important way to realize coal quality utilization and clean and efficient conversion, which is also the most challenging field of coal pyrolysis. The coal is decomposed into gas, liquid coal tar and solid semi-coke under the condition of air isolation or oxygen deficiency. The powder coal accounts for a large part of coal mining, and the pyrolysis of the powder coal produces hot semi-coke, coal gas and coal oil. The hot semi-coke is often used as fuel or raw material, but its utilization efficiency is low. Therefore, the application provides a powder coal dry distillation device, which can recycle and utilize the hot semi-coke generated in the pyrolysis tower.

[0042] In the technical scheme of the embodiment of the application, the particle size of the powder coal is less than or equal to 6 mm.

[0043] The application provides a powder coal dry distillation device, as shown in Figure 1 The pyrolysis tower 100 is the place for powder coal dry distillation, and produces pyrolysis gas, tar and hot semi-coke. In the specific implementation process, in combination with Figure 2 The pyrolysis tower 100 includes a pyrolysis tower body 110. The pyrolysis tower body 110 defines a first reaction cavity S1. The pyrolysis tower body 110 is provided with a powder coal inlet 1121, a fluidized gas inlet 1123, a high-temperature semi-coke inlet 1122 and a hot semi-coke outlet 1124 which are in communication with the first reaction cavity S1; wherein the powder coal inlet 1121 and the high-temperature semi-coke inlet 1122 are located above the fluidized gas inlet 1123, and the hot semi-coke outlet 1124 is located below the fluidized gas inlet 1123. In the first reaction cavity S1, the flow direction of the powder coal and the high-temperature semi-coke is opposite to the airflow direction of the fluidized gas; under the action of the fluidized gas, the powder coal and the high-temperature semi-coke are mixed and boiled, so as to achieve the purpose of dry distillation of the powder coal, and the generated pyrolysis gas and tar are carried to the upper part of the pyrolysis tower body 110 by the airflow, and the generated hot semi-coke falls to the lower part of the pyrolysis tower body 110 under the action of gravity and can be discharged through the hot semi-coke outlet 1124.

[0044] The pulverized coal inlet 1121 is connected to the first conveying device. The fluidizing gas inlet 1123 is connected to the third conveying device. The high-temperature semi-coke inlet 1122 is connected to the fifth conveying device 400. The hot semi-coke outlet 1124 is connected to the second conveying device 300 or via the hot semi-coke downcomer 130.

[0045] By opening a high-temperature semi-coke inlet 1122 on the pyrolysis tower body 110, high-temperature semi-coke generated after the reaction of hot semi-coke is introduced from the regeneration tower 200, thereby achieving the recycling of hot semi-coke generated in the pyrolysis tower 100 and improving the utilization efficiency of hot semi-coke.

[0046] The pyrolysis tower 100 further includes a first gas distributor 120, which is disposed within the first reaction chamber S1. It is located above the fluidizing gas inlet 1123 and below the pulverized coal inlet 1121 and the high-temperature semi-coke inlet 1122. The first gas distributor 120 and the pyrolysis tower body 110 define a fluidizing gas chamber within the first reaction chamber S1. The fluidizing gas flows uniformly upwards through a plurality of first gas holes arranged in an array on the first gas distributor 120, ensuring sufficient contact with the pulverized coal and high-temperature semi-coke. This results in the formation of a stable pyrolysis zone (dry distillation reaction zone), a high-density zone, a low-density zone, and a gas-solid separation zone along the height direction of the pyrolysis tower body 110 from bottom to top within the first reaction chamber S1. The high-density zone, low-density zone, and gas-solid separation zone are defined based on solid density. The hot semi-coke formed after pyrolysis in the dry distillation reaction zone is discharged through the hot semi-coke outlet 1124. Under the influence of airflow and gravity difference, the generated pyrolysis gas and tar are separated from the semi-coke particles in the gas-solid separation zone, and the pyrolysis gas and tar can be discharged through the first gas outlet 1111.

[0047] The first gas distributor 120 is conical. Firstly, to facilitate the discharge of hot semi-coke from the first reaction chamber S1, the conical design of the first gas distributor 120 faces the bottom of the pyrolysis tower body 110. That is, the diameter of the first gas distributor 120 gradually decreases from top to bottom along the height direction of the pyrolysis tower body 110, thereby guiding the semi-coke out of the hot semi-coke outlet 1124. Secondly, the conical shape of the first gas distributor 120 increases the volume of the pyrolysis zone, thereby improving the production of pyrolysis gas and tar. Thirdly, the conical shape of the first gas distributor 120 ensures that the fluidizing gas flows not only along the height direction of the pyrolysis tower 100 but also along the radial direction of the pyrolysis tower 100, resulting in a relatively turbulent state of the fluidizing gas. This facilitates the thorough mixing of pulverized coal and high-temperature semi-coke by the fluidizing gas, achieving efficient dry distillation.

[0048] The pulverized coal inlet 1121 and the high-temperature semi-coke inlet 1122 are located above the first gas distributor 120. The fluidizing gas inlet 1123 is located below the first gas distributor 120. Inside the pyrolysis tower 100, the fluidizing gas, under the action of the first gas distributor 120, flows upward along the height direction of the pyrolysis tower 100 to fully mix with the pulverized coal and high-temperature semi-coke for a dry distillation reaction, forming a stable pyrolysis zone in the middle section of the pyrolysis tower 100. The pyrolysis gas produced by the dry distillation reaction continues to flow upward along the height direction of the pyrolysis tower 100 under the action of the airflow, forming a gas-solid separation zone in the upper or upper-middle section of the pyrolysis tower 100. The separated pyrolysis gas and tar are discharged from the pyrolysis tower 100 through the first gas outlet 1111 located at the top of the pyrolysis tower body 110. The generated hot semi-coke descends to the lower section of the pyrolysis tower 100 and is discharged from the pyrolysis tower 100 through the hot semi-coke outlet 1124.

[0049] The pyrolysis tower 100 further includes a hot semi-coke downcomer 130. The hot semi-coke downcomer 130 is connected to the first gas distributor 120 and extends out of the pyrolysis tower body 110 through the hot semi-coke outlet 1124. In specific implementation, the tapered portion of the first gas distributor 120 has an interface, and the hot semi-coke downcomer 130 is welded to this interface. The hot semi-coke formed in the pyrolysis zone is discharged into the hot semi-coke downcomer 130 through the interface. The hot semi-coke downcomer 130 extends out of the pyrolysis tower body 110 through the hot semi-coke outlet 1124, allowing the hot semi-coke to be discharged from the pyrolysis tower body 110 through the hot semi-coke outlet 1124. The hot semi-coke downcomer 130 is connected to a second conveying device 300 to introduce the hot semi-coke into the regeneration tower 200.

[0050] Furthermore, the pyrolysis tower 100 also includes a first control gas delivery pipe 140. The first control gas delivery pipe 140 is connected to the hot semi-coke downcomer 130 and extends into the pyrolysis tower 100 through the hot semi-coke downcomer 130. The first control gas delivery pipe 140 is used to deliver control gas to the dry distillation reaction zone to control the discharge rate of the hot semi-coke, adapting to the process conditions of the regeneration tower 200. The control gas can be coal gas, nitrogen, carbon dioxide, water vapor, or a mixture of these gases. Specifically, the hot semi-coke downcomer 130 has a connection hole through which the first control gas delivery pipe 140 is embedded, and the two are sealed together. The first control gas delivery pipe 140 extends into the pyrolysis tower 100 within the hot semi-coke downcomer 130 to blow control gas into the dry distillation reaction zone, controlling the discharge rate of the hot semi-coke.

[0051] Furthermore, there are multiple fluidizing gas inlets 1123, which are spaced apart circumferentially along the pyrolysis tower body 110. This arrangement ensures that each region in the first reaction chamber S1 has a fluidizing gas flow rate that is approximately the same, allowing for complete pyrolysis of pulverized coal.

[0052] Furthermore, the pulverized coal inlet 1121 and the high-temperature semi-coke inlet 1122 are located at the same height in the pyrolysis tower body 110. That is, pulverized coal and high-temperature semi-coke enter the pyrolysis tower body 110 from the same height, which facilitates the boiling and mixing of pulverized coal and high-temperature semi-coke under the action of fluidizing gas.

[0053] Furthermore, the pyrolysis tower 100 has a first pyrolysis section 111 and a second pyrolysis section 112 integrally connected sequentially from top to bottom along its height direction. The cross-sectional area of ​​the first pyrolysis section 111 is larger than the cross-sectional area of ​​the second pyrolysis section 112. The first pyrolysis section 111 corresponds to the gas-solid separation zone. By increasing the volume of the gas-solid separation zone, the pyrolysis gas can be effectively separated from the tar and semi-coke particles, reducing the amount of semi-coke particles carried by the pyrolysis gas and tar, and improving the separation efficiency. Optionally, the ratio of the cross-sectional area of ​​the first pyrolysis section 111 to the cross-sectional area of ​​the second pyrolysis section 112 is 1.5:1 to 6.5:1.

[0054] Furthermore, the first pyrolysis section 111 is provided with a first gas outlet 1111; the pulverized coal inlet 1121, the fluidizing gas inlet 1123, the high-temperature semi-coke inlet 1122, and the hot semi-coke outlet 1124 are all located in the second pyrolysis section 112. Generally, the first gas outlet 1111 is located at the top of the pyrolysis tower 100 (first pyrolysis section 111); the generated pyrolysis gas and tar gas mixture flows toward the top of the pyrolysis tower 100 and flows out of the pyrolysis tower body 110. The pulverized coal inlet 1121, the fluidizing gas inlet 1123, the high-temperature semi-coke inlet 1122, and the hot semi-coke outlet 1124 are provided in the second pyrolysis section 112, so that a pyrolysis zone, a high-density zone, and a low-density zone are formed in the second pyrolysis section 112.

[0055] It should be noted that the heating structure of the pyrolysis tower 100 is not the focus of this application's improvement, and therefore is not shown in the description of the embodiments in this application. The temperature inside the first reaction chamber S1 is 600-800 degrees Celsius.

[0056] Under normal circumstances, after the high-temperature semi-coke is fully utilized, the solids in the pyrolysis tower 100 need to be discharged periodically to avoid solid accumulation. For this purpose, the pyrolysis tower body 110 is also provided with a first solid discharge port 1125. The first solid discharge port 1125 is located below the fluidizing gas inlet 1123.

[0057] The regeneration tower 200 is the secondary utilization site for the hot semi-coke. The hot semi-coke is heated in the regeneration tower 200 to produce high-temperature semi-coke. The high-temperature semi-coke is sent back to the pyrolysis tower 100 to be fully boiled and mixed with pulverized coal to achieve the dry distillation of pulverized coal, thereby enabling the hot semi-coke to be reused effectively.

[0058] In the specific implementation process, refer to Figure 3 As shown, the regeneration tower 200 includes a regeneration tower body 210. The regeneration tower body 210 defines a second reaction chamber, and the regeneration tower body 210 is provided with a hot semi-coke inlet 2111, a gasifying agent inlet 2121, and a first high-temperature semi-coke outlet 2122 communicating with the second reaction chamber; wherein, the hot semi-coke inlet 2111, the gasifying agent inlet 2121, and the first high-temperature semi-coke outlet 2122 are arranged sequentially from top to bottom along the height direction of the regeneration tower body 210.

[0059] Specifically, the hot semi-coke inlet 2111 is connected to the second conveying device 300. The hot semi-coke produced in the pyrolysis tower 100 is conveyed to the regeneration tower 210 through the hot semi-coke inlet 2111. The gasifying agent inlet 2121 is connected to the fourth conveying device. The gasifying agent is input into the regeneration tower 210 from the fourth conveying device. The fourth conveying device includes a gasifying agent storage tank, a gasifying agent pump, and a gasifying agent conveying pipe. The gasifying agent pump is used to convey the gasifying agent in the gasifying agent storage tank to the gasifying agent inlet 2121 through the gasifying agent conveying pipe, and then injecting it into the regeneration tower 200. Since the gasifying agent inlet 2121 is located below the hot semi-coke inlet 2111, the gasification agent flow is opposite to the flow direction of the hot semi-coke and reacts fully to generate high-temperature gas and high-temperature semi-coke. The high-temperature gas flows upward, and a portion of the high-temperature semi-coke flows downward under gravity and is discharged through the first high-temperature semi-coke outlet 2122. The first high-temperature semi-coke outlet 2122 is conveyed to the pyrolysis tower 100 through the second conveying device 300 to realize the circulation of hot semi-coke / high-temperature semi-coke.

[0060] It should be noted that the operating temperature inside the regeneration tower 200 is between 700 and 1000 degrees Celsius. The regeneration tower 200 also includes a heating structure. This heating structure can be an annular, partitioned heating structure. For example, the reaction chamber is equipped with vertical heat exchange tubes and multiple spiral heat exchange tube groups connected to them; the spiral heat exchange tube groups consist of multiple spiral heat exchange tubes with different shaft diameters, arranged in an alternating pattern with spiral heat exchange tubes of the same diameter and direction. This heating structure maintains the operating temperature inside the regeneration tower 200 between 700 and 1000 degrees Celsius to ensure complete reaction between the hot semi-coke and the gasifying agent.

[0061] The regeneration tower 200 of this application mainly utilizes the hot semi-coke from the pyrolysis tower 100 for secondary use, and generates high-temperature gas (a mixture of coal gas and kerosene) and high-temperature semi-coke that can be reused by the pyrolysis tower 100, so that the hot semi-coke / high-temperature semi-coke can be recycled.

[0062] The regeneration tower 210 has an integrally connected first regeneration section 211 and a second regeneration section 212 along the height direction from top to bottom. The hot semi-coke inlet 2111 is located on the first regeneration section 211, and the gasifying agent inlet 2121 is located on the second regeneration section 212. That is, the hot semi-coke inlet 2111 is located at the upper part of the regeneration tower 210, so that the hot semi-coke and the gasifying agent have sufficient reaction space. A temperature rise zone and a gas-solid separation zone are formed from bottom to top in the reaction chamber of the regeneration tower 200. Generally, a heating structure is provided in the temperature rise zone. In the temperature rise zone, the hot semi-coke and the gasifying agent react fully. In the gas-solid separation zone, the high-temperature gas separates from the high-temperature semi-coke.

[0063] The first regeneration section 211 has a protruding section that extends radially outward from the second regeneration section 212 in the regeneration tower body 210. The hot semi-coke inlet 2111 is located on the protruding section, and a second high-temperature semi-coke outlet 2113 is also provided on the protruding section. Within the reaction chamber, the high-temperature semi-coke particles vary in size. Finer high-temperature semi-coke has a wider range of applications, while coarser high-temperature semi-coke has relatively fewer applications and can be mixed with pulverized coal in the pyrolysis tower 100 to generate pyrolysis gas. Therefore, based on the gravity difference caused by the different particle sizes, the first regeneration section 211 has a protruding section that extends radially outward from the second regeneration section 212 in the regeneration tower body 210, and a second high-temperature semi-coke outlet 2113 is also provided on the protruding section. The gas carries the finer high-temperature semi-coke to the gas-solid separation zone, while the coarser high-temperature semi-coke flows towards the bottom of the regeneration tower 200 under gravity. In the gas-solid separation zone, the finer high-temperature semi-coke falls onto the convex section under gravity and is then discharged from the regeneration tower 200 by the second high-temperature semi-coke outlet 2113.

[0064] The inner diameter ratio of the first regeneration section 211 and the second regeneration section 212 is 1.5:1 to 6.5:1. The first regeneration section 211 corresponds to the gas-solid separation zone. By increasing the volume of the gas-solid separation zone, the pyrolysis gas can be effectively separated from the tar and high-temperature semi-coke particles, reducing the amount of high-temperature semi-coke particles carried by the pyrolysis gas and tar, and improving the separation efficiency. The finer high-temperature semi-coke particles fall into the protruding section, while the coarser high-temperature semi-coke particles descend to the first high-temperature semi-coke outlet 2122.

[0065] The regeneration tower 200 further includes a second gas distributor 220, which is disposed within the second reaction chamber. The second gas distributor 220 is located between the hot semi-coke inlet 2111 and the gasifying agent inlet 2121. Within the regeneration tower 200, the gasifying agent, through the action of the second gas distributor 220, flows upwards along the height direction of the regeneration tower 200 to fully mix with the hot semi-coke, thereby "regenerating" the hot semi-coke and forming high-temperature semi-coke that can be reused by the pyrolysis tower 100. Under the action of the gasifying agent flow, a gas-solid separation zone, a low-density zone, a high-density zone, and a high-temperature zone (or regeneration zone) are sequentially formed from bottom to top along the height direction of the regeneration tower 200. In the gas-solid separation zone, the generated high-temperature gas separates from the solid particles; the low-density and high-density zones are areas divided according to different high-temperature semi-coke particle sizes; the high-temperature zone (or regeneration zone) is used to heat the hot semi-coke to form high-temperature semi-coke. The separated high-temperature gas mixture is discharged from the regeneration tower 200 through the first gas outlet 1111 located at the top of the regeneration tower body 210. The coarser high-temperature semi-coke produced falls to the lower section of the regeneration tower 200 and is discharged through the first high-temperature semi-coke outlet 2122. The finer high-temperature semi-coke produced is carried by the gas flow to the gas-solid separation zone where it is separated, falls onto the protruding section, and is discharged from the regeneration tower 200 through the second high-temperature semi-coke outlet 2113.

[0066] The regeneration tower 200 also includes a high-temperature semi-coke downcomer 230, which is connected to the second gas distributor 220 and extends out of the regeneration tower body 210 through the first high-temperature semi-coke outlet 2122. In specific implementation, the second gas distributor 220 is conical in shape, with an interface at its conical portion, to which the high-temperature semi-coke downcomer 230 is welded. The coarser high-temperature semi-coke formed in the regeneration zone is discharged into the high-temperature semi-coke downcomer 230 through the interface. The high-temperature semi-coke downcomer 230 extends out of the regeneration tower body 210 through the high-temperature semi-coke outlet, allowing the high-temperature semi-coke to be discharged from the regeneration tower body 210 through the first high-temperature semi-coke outlet 2122. This high-temperature semi-coke downcomer 230 is connected to the fifth conveying device 400, introducing the coarser high-temperature semi-coke into the pyrolysis tower 100 for recycling.

[0067] In some embodiments, the regeneration tower 200 further includes a control gas delivery pipe connected to the high-temperature semi-coke downcomer 230 and extending through the high-temperature semi-coke downcomer 230 into the regeneration tower body 210. A second control gas delivery pipe 240 is connected to the high-temperature semi-coke downcomer 230 and extends through the high-temperature semi-coke downcomer 230 into the regeneration tower 200. The second control gas delivery pipe 240 is used to deliver control gas to the regeneration zone to control the discharge rate of the high-temperature semi-coke, adapting to the process conditions of the regeneration tower 200. The control gas can be coal gas, nitrogen, carbon dioxide, water vapor, or a mixture of these gases. Specifically, the high-temperature semi-coke downcomer 230 has a connection hole through which the second control gas delivery pipe 240 is embedded and sealed. The second control gas delivery pipe 240 extends within the high-temperature semi-coke downcomer 230 into the regeneration tower 200 to blow control gas into the high-temperature zone, controlling the discharge rate of the high-temperature semi-coke.

[0068] In some embodiments, there are multiple gasifying agent inlets 2121, which are spaced apart circumferentially along the regeneration tower 210. This arrangement facilitates the presence of gasifying agent with approximately the same flow rate in each region of the second reaction chamber, ensuring thorough mixing of the gasifying agent with the hot semi-coke and stratifying the high-temperature semi-coke according to particle size. From top to bottom, the regeneration tower 210 consists of a gas-solid separation zone, a low-density zone, a high-density zone, and a high-temperature zone. The low-density and high-density zones are formed by the high-temperature semi-coke due to its different particle size under the action of the gasifying agent flow. The high-temperature zone is where the hot semi-coke is heated. Therefore, a heating structure is typically provided in the high-temperature zone, which is similar to or identical to the high-temperature structure of the pyrolysis tower 100, used to heat the hot semi-coke to 700 to 1000 degrees Celsius under the action of the gasifying agent.

[0069] In some embodiments, the regeneration tower body 210 further includes a second gas outlet 2112 located above the hot semi-coke inlet 2111. The high-temperature gas mixture generated within the regeneration tower body 210 is discharged from the regeneration tower 200 through the second gas outlet 2112. Generally, the second gas outlet 2112 is located at the top of the regeneration tower 200 (first regeneration section 211); the generated high-temperature gas mixture of pyrolysis gas and tar flows toward the top of the regeneration tower 200 and is discharged from the pyrolysis tower 100 through the second gas outlet 2112. The second regeneration section 212 is provided with the gasifying agent inlet 2121 and the high-temperature semi-coke outlet.

[0070] In some embodiments, after the hot semi-coke has been fully utilized, the solids in the regeneration tower 200 need to be periodically discharged to avoid solid accumulation. Therefore, the regeneration tower body 210 is also provided with a second solid discharge port 2123 located below the gasifying agent inlet 2121. By providing the second solid discharge port 2123, the solids in the regeneration tower body 210 are periodically discharged from the regeneration tower 200.

[0071] In summary, the regeneration tower 200 includes a regeneration tower body 210 and a second gas distributor 220 disposed within the regeneration tower body 210. The regeneration tower body 210 is provided with a hot semi-coke inlet 2111, a first high-temperature semi-coke outlet 2122, a second high-temperature semi-coke outlet 2113, and a gasifying agent inlet 2121. The second high-temperature semi-coke outlet 2113 and the second solids discharge outlet 2123 are disposed above the second gas distributor 220. The first high-temperature semi-coke outlet 2122 is disposed at the lower part of the regeneration tower body 210. The gasifying agent inlet 2121 is disposed above the second gas distributor 220.

[0072] The fourth conveying device transports the gasifying agent through the gasifying agent inlet 2121 into the regeneration tower 200. After passing through the second gas distributor 220, the gasifying agent inlet 2121 flows upward along the height direction of the regeneration tower 200, generating an airflow that forms convection with the hot semi-coke entering from the upper part of the regeneration tower 200. Simultaneously, the hot semi-coke is heated to a preset temperature to form high-temperature semi-coke. The finer-sized high-temperature semi-coke is carried by the airflow to the upper part of the regeneration tower 200 and can be discharged from the second high-temperature semi-coke outlet 2113. The coarser-sized high-temperature semi-coke descends to the bottom of the regeneration tower 200 under gravity and is discharged from the regeneration tower 200 through the second high-temperature semi-coke outlet 2113. The second high-temperature semi-coke outlet 2113 is connected to the fifth conveying device 400, which then recycles the coarser-sized high-temperature semi-coke back into the pyrolysis tower 100 for further utilization.

[0073] Generally, the upper middle part of the regeneration tower 200 is provided with a second high-temperature semi-coke outlet 2113 and a hot semi-coke inlet 2111 at the same height. The output end of the first conveying pipe is connected to the hot semi-coke inlet 2111, and the second high-temperature semi-coke outlet 2113 is connected to the semi-coke discharge pipe, which is used to discharge a portion of the hot semi-coke from the regeneration tower 200.

[0074] The pulverized coal dry distillation apparatus also includes a first conveying device (not shown). The first conveying device is connected to the pyrolysis tower 100 and is used to convey pulverized coal into the pyrolysis tower 100. In specific implementation, the first conveying device can be a screw conveyor. Pulverized coal is screwed into the pyrolysis tower 100.

[0075] The pulverized coal dry distillation apparatus further includes a second conveying device 300. The pyrolysis tower 100 and the regeneration tower 200 are connected via the second conveying device 300, which is used to convey the hot semi-coke produced in the pyrolysis tower 100 to the regeneration tower 200. The hot semi-coke produced in the pyrolysis tower 100 is discharged from the pyrolysis tower 100 via the second conveying device 300 and conveyed to the regeneration tower 200 for regeneration.

[0076] The pulverized coal dry distillation unit also includes a third conveying device (not shown), connected to the pyrolysis tower 100, for conveying fluidizing gas into the pyrolysis tower 100. When the fluidizing gas is injected into the pyrolysis tower 100, pulverized coal and high-temperature semi-coke form a pyrolysis zone to produce pyrolysis gas, tar, and hot semi-coke. The third conveying device includes a fluidizing gas pump, a fluidizing gas tank, and a sulfide gas conveying pipe. The fluidizing gas pump is used to convey the fluidizing gas from the fluidizing gas tank through the fluidizing gas conveying pipe to the fluidizing gas inlet, thereby injecting the fluidizing gas into the pyrolysis tower.

[0077] The pulverized coal dry distillation unit also includes a fourth conveying device (not shown), which is connected to the regeneration tower 200 and is used to convey the gasifying agent into the regeneration tower 200. Inside the regeneration tower 200, the hot semi-coke reacts with the gasifying agent, raising the temperature of the semi-coke to 800-1000℃ to produce high-temperature semi-coke.

[0078] The pulverized coal dry distillation apparatus also includes a fifth conveying device 400. The regeneration tower 200 and the pyrolysis tower 100 are connected by the fifth conveying device 400, which is used to convey the high-temperature semi-coke generated in the regeneration tower 200 to the pyrolysis tower 100. The high-temperature semi-coke generated in the regeneration tower 200 is conveyed to the pyrolysis tower 100 by the fifth conveying device 400, thereby recycling the hot semi-coke.

[0079] Combination Figure 1 As shown, in the technical solution of this application, the connection between the pyrolysis tower 100 and the regeneration tower 200 via the second conveying device 300 and the fifth conveying device 400 enables uninterrupted circulation of high-temperature semi-coke / hot semi-coke, facilitating the smooth progress of the pulverized coal dry distillation reaction and efficiently utilizing the hot semi-coke produced during pulverized coal dry distillation. In the technical solution of this application, fluidizing gas is conveyed into the pyrolysis tower 100 via the third conveying device. With the circulation of high-temperature semi-coke and the participation of the fluidizing gas, the rapid dry distillation reaction of pulverized coal is achieved, greatly improving the tar yield of pulverized coal. A gasifying agent is conveyed into the regeneration tower 200 via the fourth conveying device, causing the hot semi-coke to transform into high-temperature semi-coke under the action of the gasifying agent, which can then be directly used as a reaction medium in the pyrolysis tower 100.

[0080] Compared to existing technologies, the technical solution of this application fully couples high-temperature semi-coke, hot semi-coke, and gasification technologies. Within the regeneration tower 200, high temperature and a gasifying agent are used to transform the hot semi-coke into high-temperature semi-coke usable within the pyrolysis tower 100. Within the pyrolysis tower 100, the high-temperature semi-coke and pulverized coal can be directly pyrolyzed and gasified under the action of fluidizing gas. The technical solution of this application utilizes the coupling of high-temperature semi-coke and fluidizing gas, and the coupling of hot semi-coke and a gasifying agent within the pyrolysis tower 100 and regeneration tower 200, respectively, to achieve efficient pyrolysis and gasification of pulverized coal in a staged and location-specific manner. This significantly reduces energy consumption and efficiently utilizes the hot semi-coke generated from pulverized coal, thereby maximizing the utilization efficiency of pulverized coal.

[0081] In the technical solution of this application, the fluidizing gas can generally be at least one of air, nitrogen, carbon dioxide, and self-produced coal gas. The gasifying agent can generally be at least one of air, pure oxygen, oxygen-enriched gas, steam, and carbon dioxide gas.

[0082] As an optional embodiment of the above embodiments, the second conveying device 300 includes a first conveying pipe. The input end of the first conveying pipe is connected to the bottom of the pyrolysis tower 100 for discharging the hot semi-coke from the bottom of the pyrolysis tower 100. Generally, the input end of the first conveying pipe is connected to the hot semi-coke downcomer 130. The output end of the first conveying pipe is connected to the upper middle part of the regeneration tower 200 for discharging the hot semi-coke to the upper middle part of the regeneration tower 200. Generally, the output end of the first conveying pipe is connected to the inlet 2111. Inside the pyrolysis tower 100, under the action of fluidizing gas, the tar, pyrolysis gas, and hot semi-coke produced by pyrolysis are initially separated. Under the action of gravity, the hot semi-coke descends from the dry distillation reaction zone to the bottom of the pyrolysis tower 100, is discharged through the hot semi-coke downcomer 130 into the first conveying pipe, and is then conveyed to the regeneration tower 200 by the first conveying pipe.

[0083] The output end of the first conveying pipe is connected to the upper middle part of the regeneration tower 200 (specifically, the hot semi-coke inlet 2111) to convey the hot semi-coke into the regeneration tower 200. This allows the hot semi-coke to fully contact the gasifying agent as it falls from top to bottom within the regeneration tower 200, generating high-temperature semi-coke of different particle sizes at different locations within the regeneration tower 200. Furthermore, different outlets can be opened at different locations on the regeneration tower body 210 of the regeneration tower 200 to discharge high-temperature semi-coke of different particle sizes. For example, typically, a first high-temperature semi-coke outlet 2122 is provided at the bottom of the regeneration tower 200. This first high-temperature semi-coke outlet 2122 is connected to the high-temperature semi-coke inlet 1122 of the pyrolysis tower 100 to discharge the high-temperature semi-coke within the regeneration tower 200 that meets the requirements for dry distillation into the pyrolysis tower 100.

[0084] As an optional implementation of the above embodiments, the second conveying device 300 further includes a first conveying valve, which is disposed on the first conveying pipe and connected to a gas supply device for controlling the conveying speed of the hot semi-coke. The gas supply device injects gas into the first conveying valve to provide the flow power for the hot semi-coke in the first conveying pipe. The conveying speed of the hot semi-coke can be controlled by controlling the flow rate and pressure of the gas injected into the first conveying valve by the gas supply device. On the one hand, if the pyrolyzed hot semi-coke cannot be directly utilized at a high temperature, it is difficult to utilize it efficiently. Therefore, the conveying speed of the hot semi-coke affects the temperature when it enters the regeneration tower 200; generally, the higher the temperature of the hot semi-coke entering the regeneration tower 200, the more conducive it is to its efficient utilization. On the other hand, the conveying speed of the hot semi-coke affects the amount of high-temperature semi-coke produced per unit time in the regeneration tower 200. The conveying speed of the hot semi-coke is an important process parameter of this pulverized coal dry distillation unit, affecting the output of pyrolysis gas and kerosene, as well as the utilization efficiency of high-temperature semi-coke. Therefore, it is essential to reasonably control the conveying speed of hot semi-coke for the efficiency of the pulverized coal dry distillation unit. To this end, this embodiment of the application sets a first conveying valve on the first conveying pipe and controls the conveying speed of hot semi-coke through a gas supply device.

[0085] Generally, a gas supply device may include a gas pressurization device such as a compressor and a first gas supply pipe. The gas injected into the first delivery valve by the gas supply device may be air, nitrogen, carbon dioxide, self-produced coal gas, or a mixture thereof.

[0086] As an optional embodiment of the above embodiments, the fifth conveying device 400 includes a second conveying pipe. The input end of the second conveying pipe is connected to the bottom of the regeneration tower 200 for discharging the high-temperature semi-coke from the bottom of the pyrolysis tower 100. The input end of the second conveying pipe is connected to the first high-temperature semi-coke outlet 2122. The output end of the second conveying pipe is connected to the middle of the pyrolysis tower 100 for discharging the high-temperature semi-coke to the middle of the pyrolysis tower 100. The output end of the second conveying pipe is connected to the high-temperature semi-coke inlet 1122.

[0087] Generally, the regeneration tower 200 has a first high-temperature semi-coke outlet 2122 at the bottom. High-temperature semi-coke with larger particle size is discharged from the first high-temperature semi-coke outlet 2122 of the regeneration tower 200 and is transported from the second conveying pipe to the high-temperature semi-coke inlet 1122 located in the middle of the pyrolysis tower 100. The high-temperature semi-coke is then fed into the pyrolysis tower 100 from the middle, completing the recycling of hot semi-coke / high-temperature semi-coke.

[0088] As an optional embodiment of the above embodiments, the second conveying device 300 further includes a second conveying valve, which is disposed on the second conveying pipe. The second conveying valve can control the amount of high-temperature semi-coke input into the pyrolysis tower 100.

[0089] This application also proposes a method for the dry distillation of pulverized coal, comprising the following steps:

[0090] S100, pulverized coal is fed into pyrolysis tower 100 through the first conveying device;

[0091] S200, the high-temperature semi-coke generated in the regeneration tower 200 is transported to the pyrolysis tower 100 through the second conveying device 300;

[0092] S300, the fluidizing gas is conveyed to the pyrolysis tower 100 via the third conveying device.

[0093] Inside the pyrolysis tower 100, the pulverized coal, the high-temperature semi-coke, and the fluidizing gas are mixed in a boiling manner, producing tar, pyrolysis gas, and hot semi-coke.

[0094] S400, the gasifying agent is transported to the regeneration tower 200 through the fourth conveying device;

[0095] S500, the hot semi-coke is returned to the regeneration tower 200 via the fifth conveying device 400;

[0096] Inside the regeneration tower 200, the temperature of the pyrolyzed semi-coke is raised to a preset temperature, making it a high-temperature semi-coke, and then the high-temperature semi-coke is transported to the pyrolysis tower 100 through the second conveying device.

[0097] In the technical solution of this application, a continuous circulation of high-temperature semi-coke / hot semi-coke is achieved between the pyrolysis tower 100 and the regeneration tower 200 through the connection of the second conveying device 300 and the fifth conveying device 400, enabling the smooth progress of the pulverized coal dry distillation reaction and highly efficient utilization of the hot semi-coke generated from the pulverized coal dry distillation. In the technical solution of this application, fluidizing gas is conveyed into the pyrolysis tower 100 through the third conveying device. With the circulation of high-temperature semi-coke and the participation of fluidizing gas, a rapid pulverized coal dry distillation reaction is achieved, greatly improving the tar yield of pulverized coal. A gasifying agent is conveyed into the regeneration tower 200 through the fourth conveying device, causing the hot semi-coke to generate high-temperature semi-coke under the action of the gasifying agent and high temperature, which can be directly used as a reaction medium in the pyrolysis tower 100.

[0098] Compared to existing technologies, the technical solution of this application fully couples high-temperature semi-coke, hot semi-coke, and gasification technologies. Within the regeneration tower 200, high temperature and a gasifying agent are used to transform the hot semi-coke into high-temperature semi-coke usable within the pyrolysis tower 100. Within the pyrolysis tower 100, the high-temperature semi-coke and pulverized coal can be directly pyrolyzed and gasified under the action of fluidizing gas. The technical solution of this application utilizes the coupling of high-temperature semi-coke and fluidizing gas, and the coupling of hot semi-coke and a gasifying agent within the pyrolysis tower 100 and regeneration tower 200, respectively, to achieve efficient pyrolysis and gasification of pulverized coal in a staged and location-specific manner. This significantly reduces energy consumption and efficiently utilizes the hot semi-coke generated from pulverized coal, thereby maximizing the utilization efficiency of pulverized coal.

[0099] As an optional implementation of the above embodiments, the preset temperature is 700°C to 1000°C. The operating temperature inside the regeneration tower 200 is maintained between 700°C and 1000°C to allow the hot semi-coke and the gasifying agent to react fully.

[0100] As an optional implementation of the above embodiments, a first control gas is injected into the pyrolysis tower 100 from the bottom via a sixth conveying device. For example, the sixth conveying device has a first control gas delivery pipe 140. The first control gas delivery pipe 140 is connected to the hot semi-coke downcomer 130 and extends into the pyrolysis tower 100 through the hot semi-coke downcomer 130. The first control gas delivery pipe 140 is used to deliver control gas to the dry distillation reaction zone to control the discharge rate of the hot semi-coke, adapting to the process conditions of the regeneration tower 200. The control gas can be coal gas, nitrogen, carbon dioxide, water vapor, or a mixture of these gases. Specifically, the hot semi-coke downcomer 130 has a connection hole through which the control gas delivery pipe is embedded and sealed. The control gas delivery pipe extends into the pyrolysis tower 100 within the hot semi-coke downcomer 130 to blow control gas into the dry distillation reaction zone, controlling the discharge rate of the hot semi-coke.

[0101] As an optional implementation of the above embodiments, a second control gas is injected into the regeneration tower 200 from the bottom via a seventh conveying device. For example, the seventh conveying device has a second control gas delivery pipe 240. The second control gas delivery pipe 240 is connected to the high-temperature semi-coke downcomer 230 and extends into the regeneration tower body 210 through the high-temperature semi-coke downcomer 230. The second control gas delivery pipe 240 is used to deliver control gas to the regeneration zone to control the discharge rate of the high-temperature semi-coke to adapt to the process conditions of the regeneration tower 200. The control gas can be coal gas, nitrogen, carbon dioxide, water vapor, or a mixture of these gases. Specifically, the high-temperature semi-coke downcomer 230 has a connection hole through which the second control gas delivery pipe 240 is inserted and sealed. The second control gas delivery pipe 240 extends from the high-temperature semi-coke downcomer 230 into the regeneration tower 200 to blow control gas into the high-temperature zone and control the discharge rate of the high-temperature semi-coke.

[0102] The above provides a detailed description of a pulverized coal dry distillation apparatus and method provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A coal dry distillation apparatus characterized by comprising: The application relates to a pyrolysis and regeneration system for producing high-temperature semi-coke, which comprises a pyrolysis tower and a regeneration tower; the regeneration tower comprises a regeneration tower body which is integrally connected with a first regeneration section and a second regeneration section arranged in a height direction from top to bottom; a hot semi-coke inlet, a first high-temperature semi-coke outlet, a second high-temperature semi-coke outlet and a gasification agent inlet are arranged on the regeneration tower body, and the first high-temperature semi-coke outlet is arranged at the lower part of the regeneration tower body; the hot semi-coke inlet is arranged on the first regeneration section, the gasification agent inlet is arranged on the second regeneration section, the first regeneration section has a protruding section which protrudes the second regeneration section in a radial direction of the regeneration tower body, the hot semi-coke inlet is arranged on the protruding section, and the second high-temperature semi-coke outlet is arranged on the protruding section; a first conveying device is connected with the pyrolysis tower and used for conveying pulverized coal into the pyrolysis tower; a second conveying device is connected with the pyrolysis tower and the regeneration tower and used for conveying hot semi-coke produced in the pyrolysis tower into the regeneration tower; a third conveying device is connected with the pyrolysis tower and used for conveying fluidizing gas into the pyrolysis tower; a fourth conveying device is connected with the regeneration tower and used for conveying a gasification agent into the regeneration tower; and a fifth conveying device is connected with the regeneration tower and the pyrolysis tower and used for conveying high-temperature semi-coke produced in the regeneration tower into the pyrolysis tower. The second conveying device comprises a first conveying pipe, an input end of the first conveying pipe is connected with the bottom of the pyrolysis tower and used for discharging the hot semi-coke from the bottom of the pyrolysis tower; and an output end of the first conveying pipe is connected with the middle upper part of the regeneration tower and used for discharging the hot semi-coke into the middle upper part of the regeneration tower. The second conveying device further comprises a first conveying valve arranged on the first conveying pipe, the first conveying valve is connected with a gas supply device and used for controlling the conveying speed of the hot semi-coke. the middle upper part of the regeneration tower is provided with the second high-temperature semi-coke outlet and the hot semi-coke inlet arranged at the same height, the output end of the first conveying pipe is communicated with the hot semi-coke inlet, 2. The coal dry distillation apparatus according to claim 1, wherein the second high-temperature semi-coke outlet is communicated with a semi-coke discharging pipe and used for discharging a part of the high-temperature semi-coke from the regeneration tower. The fifth conveying device comprises a second conveying pipe, 3. The coal dry distillation apparatus according to claim 2, wherein an input end of the second conveying pipe is connected with the bottom of the regeneration tower and used for discharging the high-temperature semi-coke from the bottom of the pyrolysis tower; and an output end of the second conveying pipe is connected with the middle part of the pyrolysis tower and used for discharging the high-temperature semi-coke into the middle part of the pyrolysis tower. The second conveying device further comprises a second conveying valve arranged on the second conveying pipe.

4. The coal dry distillation apparatus according to claim 2 or 3, wherein The application further discloses a pyrolysis and regeneration method for producing high-temperature semi-coke, which comprises the following steps: inputting pulverized coal into the pyrolysis tower through a first conveying device; conveying high-temperature semi-coke produced in the regeneration tower into the pyrolysis tower through a fifth conveying device; 5. The coal dry distillation apparatus according to claim 1, wherein conveying fluidizing gas into the pyrolysis tower through a third conveying device, in the pyrolysis tower, the pulverized coal, the high-temperature semi-coke and the fluidizing gas are boiled and mixed to produce tar, pyrolysis gas and hot semi-coke; 6. The coal dry distillation apparatus according to claim 5, wherein conveying a gasification agent into the regeneration tower through a fourth conveying device; and 7. A method of dry distilling fine coal, which is carried out in the fine coal dry distillation apparatus according to any one of claims 1 to 6, characterized by, conveying the hot semi-coke from the bottom of the pyrolysis tower to the middle upper part of the regeneration tower through the first conveying pipe. ​ ​ ​ ​ ​ The hot semi-coke is sent back into the regeneration tower by a second conveying device; In the regeneration tower, the temperature of the pyrolyzed semi-coke is raised to a preset temperature, so that the semi-coke becomes high-temperature semi-coke, and the high-temperature semi-coke is conveyed into the pyrolysis tower by the fifth conveying device.

8. The coal dry distillation method according to claim 7, characterized by, The preset temperature is 700-1000°C.

9. The coal dry distillation method according to claim 7, wherein A first control gas is injected into the pyrolysis tower from the bottom of the pyrolysis tower by a first control gas conveying pipe.

10. The coal dry distillation method according to claim 7, wherein A second control gas is injected into the regeneration tower from the bottom of the regeneration tower by a second control gas conveying pipe.

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