A super large triple-tube central pipe type rotating bed gasifier

Abstract

The application discloses a super-large triad central tube type rotating bed gasification furnace, which comprises a hearth with a gasification section and a dry distillation section, and the wall part of the hearth is provided with an annular channel extending in the circumferential direction; a triad central tube assembly is arranged at a relatively upper position in the dry distillation section and comprises three array tubes arranged in a circumferential array with the hearth central axis as a reference and a flow collecting mechanism connected to the top of the three array tubes. The triad central tube realizes multi-point uniform gas collection and primary separation, the triad structure guarantees uniform radial heating of the dry distillation section, reduces tar generation from the source, and then the gap and the annular channel are used to realize forced backflow of heavy tar, uncompletely combusted fine carbon particles and fly ash to the gasification section combustion chamber for secondary cracking, thereby reducing the tar content of the outlet coal gas, the array tube dispersion reduces the inlet flow rate, effectively reduces the fly ash entrainment in the coal gas, the uniform gas extraction point optimizes the bed layer gasification agent distribution, and the carbon conversion rate is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of biomass gasification furnace technology, and in particular to an ultra-large triple-unit central tube rotary bed gasification furnace. Background Technology

[0002] Coal gasification technology is the core process for converting coal into syngas, which is an important raw material for the synthesis of ammonia, methanol, liquid fuels, and various chemicals. As chemical plants develop towards larger scale and higher efficiency, traditional rotary bed gasifiers have gradually revealed several technical problems in their structural design that restrict their performance improvement and stable operation. Traditional single-center-pipe gas collection and distribution structures, with a single central pipe located on the central axis of the gasifier, are the mainstream design for collecting and transporting high-temperature gas from the gasification section. However, in ultra-large furnaces with increased diameters (typically greater than 6 meters, or a single furnace coal feed exceeding 500 tons / day, or a gasification section cross-sectional area ≥ 30 square meters), the high-temperature gas generated from the wide cross-section above the grate experiences varying flow paths and uneven resistance as it converges towards the central point. This easily leads to imbalances in the radial gas flow distribution within the furnace, affecting the uniformity of the gasification reaction. The gas composition and temperature collected by the single central pipe are essentially average values ​​across the entire cross-section, making it difficult to accurately reflect the potential differences in reaction states at different radial locations (such as the central and edge areas). This weakens the ability to accurately monitor and control furnace conditions through gas parameters. Therefore, traditional single-center pipes struggle to guarantee the uniformity and representativeness of the gas flow in ultra-large furnaces. Summary of the Invention

[0003] The purpose of this invention is to provide an ultra-large triple-unit central tube rotary bed gasifier to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides an ultra-large triple-unit central tube rotary bed gasifier, comprising: The furnace has a gasification section with a relatively large cross-sectional area and a dry distillation section with a relatively small cross-sectional area. The upper part of the dry distillation section is provided with a gasified gas outlet in the transverse direction. The wall of the furnace is provided with an annular channel extending in the circumferential direction. The lower end of the annular channel is connected to the gasification section. The triple-tube central assembly, located at a relatively upper position in the distillation section, includes three array tubes arranged in a circular array with reference to the central axis of the furnace, and a confluence mechanism connected to the top of the three array tubes. The confluence mechanism includes: A central common cavity located at the center of the array; Three inner connecting tubes that connect the top of each array tube to the side wall of the central common cavity; Three connecting pipes that guide the top of each array tube to the outer side wall of the furnace; And a guide pipe, one end of which is connected to the outer connecting pipe, and the other end is embedded in the annular channel with a notch in the embedded part. One end of the guide pipe passes through the furnace wall and is set in the gasification gas outlet for outputting gasification gas.

[0005] In operation, raw coal is added through an offset coal inlet and falls onto a rotating tower grate, forming a uniform material layer. This layer flows from top to bottom through a dry distillation section and a gasification section, with ash and slag discharged through the grate. During gasification and collection, a gasifying agent is introduced from a bottom gas supply device, generating high-temperature gasified gas in the combustion chamber of the gasification section. This rising gas is collected at specific radial positions by three evenly distributed array tubes. The gas is then divided at a confluence mechanism; one portion enters the central common cavity through an inner connecting pipe, where its sensible heat indirectly heats the coal in the dry distillation section through the cavity wall. The other portion flows to the gasified gas outlet through an outer connecting pipe and a guide pipe. In the guide pipe, some gas containing heavy components enters the annular channel of the furnace wall through a gap and returns to the high-temperature zone below for secondary reaction. The purified mainstream gas is then output from the gasified gas outlet.

[0006] This invention achieves multi-point uniform gas collection and initial separation through a triple-tube central structure. The triple-tube structure ensures uniform radial heating in the dry distillation section, reducing tar generation at the source. Then, through gaps and annular channels, heavy tar, unburned fine carbon particles, and fly ash are forced back to the combustion chamber of the gasification section for secondary cracking, reducing the tar content of the outlet gas. The array tube dispersion reduces the inlet flow rate, effectively reducing fly ash entrainment in the gas. The uniform extraction points optimize the distribution of gasifying agent in the bed, effectively improving the carbon conversion rate.

[0007] As a further improvement of the present invention, the central axis of the three array tubes is located on the same circumference with the furnace central axis as the center and the radius between 1 / 4 and 1 / 2 of the furnace radius.

[0008] The three array tubes in this improved scheme are arranged in an annular area with a furnace radius of 1 / 4 to 1 / 2. This is precisely the area where the gasification reaction is most active and the temperature is most uniform. The sensible heat of the high-temperature coal gas is uniformly transferred upward to the entire cross-section of the furnace in the dry distillation section, avoiding the existence of low-temperature zones at the edges. This creates conditions for uniform and complete dry distillation of coal and reduces the heavy tar produced due to local low temperatures.

[0009] As a further improvement of the present invention, the flow cross-section of the inner connecting pipe and the outer connecting pipe gradually decreases from the end connected to the array tube to the other end. This improvement optimizes airflow dynamics, prevents tar and dust from accumulating and clogging the connection points, and enhances the long-term stability of the system.

[0010] As a further improvement of the present invention, the guide pipe is horizontally arranged, with one end connected to the outer connecting pipe via a flange, and the other end passing through the inner wall of the furnace into the annular channel. The notch is formed at the bottom of the guide pipe wall. This improved solution actively guides heavier, unreacted, and unburned substances into the annular channel for backflow, achieving active control over the quality of the outlet gas.

[0011] As a further improvement of the present invention, a furnace top cover is provided at the top of the furnace, and the furnace top cover has a dry distillation gas outlet communicating with the interior of the furnace. This improved solution achieves complete separation of dry distillation gas and gasification gas, laying the foundation for separate purification and high-value utilization, and improving economic efficiency.

[0012] As a further improvement of the present invention, the furnace top cover is provided with a coal feeding port, which is eccentrically positioned relative to the central axis of the furnace. This eccentric coal feeding port design ensures uniform material distribution over a large area, which is a prerequisite for ensuring uniform subsequent gasification reactions and complements the uniform gas collection function of the triple-tube central pipe.

[0013] As a further improvement of the present invention, a rotatable tower grate is provided at the center of the gasification section. The rotational motion, in conjunction with the eccentric coal feed port, spreads the falling coal into a uniformly thick annular material belt on the bed, and the continuous and uniform material distribution improves the uniformity of the gasification reaction across the entire cross-section.

[0014] As a further improvement of the present invention, the furnace wall of the gasification section is provided with a water jacket, which includes an upper atmospheric pressure water jacket and a lower high-pressure water jacket. This improved scheme adopts differentiated thermal protection. The high-pressure water jacket is located at the furnace wall between the oxide layer and the core area of ​​the combustion chamber, where the heat flux density is extremely high and the temperature is highest. This avoids the formation of a vapor film that affects heat transfer, ensures that a huge amount of heat can be carried away, and prevents the furnace wall from burning through, thus ensuring safety.

[0015] As a further improvement of the present invention, a plurality of flame detection holes are provided in the upper part of the gasification section and on the radially outer side of the annular channel. The flame detection holes are designed with different angles and are located on the radially outer side of the annular channel to avoid damaging the structural integrity and airtightness of the annular channel by opening the holes. Moreover, being located in the upper part of the gasification section, it is convenient to directly observe the position, thickness and combustion status of the combustion layer.

[0016] In an optional embodiment, the bottom of the furnace is provided with a gas supply device for introducing oxidant and gasifying agent. The gas supply device, along the gas inlet direction, includes, in sequence, a dry check valve, a bent-tube flow meter, an electrically adjustable butterfly valve, a steam mixer, and an air chamber located directly below the tower grate. The dry check valve prevents backflow of furnace gas into the return air pipe under abnormal conditions, which could lead to an explosion. The bent-tube flow meter measures the total gasifying agent flow rate online. The electrically adjustable butterfly valve adjusts the gas inlet flow rate according to the flow meter signal and process requirements, achieving load control. The steam mixer uniformly mixes the regulated gasifying agent with superheated steam to form the final gasification medium. The air chamber, located directly below the grate, distributes the mixed gasifying agent evenly throughout the bottom of the grate, ensuring uniform gas distribution at the bottom of the bed. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the structure of the rotating bed gasifier in the embodiment; Figure 2 This is a schematic diagram of the structure of the triplet central tube assembly in the embodiment; Figure 3 This is a schematic diagram of the structure of the triplet central tube assembly in an embodiment.

[0018] In the attached diagram: 100: Furnace, 110: Gasification section, 111: Atmospheric water jacket, 112: High-pressure water jacket, 120: Dry distillation section, 130: Gasified coal outlet, 140: Annular channel, 150: Furnace top cover, 160: Dry distillation gas outlet, 170: Coal feeding port, 171: Coal feeding mechanism, 172: Coal bunker, 180: Fire detection hole, 200: Tri-unit central tube assembly, 210: Array tube, 220: Central common cavity, 230: Inner connecting pipe, 240: Outer connecting pipe, 250: Guide pipe, 260: Notch, 300: Tower grate, 310: Ash pan, 410: Dry check valve, 420: Bend flow, 430: Electric regulating butterfly valve, 440: Steam mixer, 450: Wind chamber. Detailed Implementation

[0019] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1 to 3 The following are several embodiments of an ultra-large triple-unit central tube rotary bed gasifier of the present invention.

[0024] Embodiments of the present invention provide an ultra-large triple-unit central tube rotary bed gasifier, such as... Figures 1 to 3 As shown, it includes: The furnace 100 has a gasification section 110 with a relatively large cross-sectional area and a dry distillation section 120 with a relatively small cross-sectional area. The upper part of the dry distillation section 120 is provided with a gasification gas outlet 130 in the transverse direction. The wall of the furnace 100 is provided with an annular channel 140 extending in the circumferential direction. The lower end of the annular channel 140 is connected to the gasification section 110. The triple-tube central tube assembly 200 is located at a relatively upper position in the distillation section 120. It includes three array tubes 210 arranged in a circular array with reference to the central axis of the furnace 100, and a confluence mechanism connected to the top of the three array tubes 210. The confluence mechanism includes: A central common cavity 220 located at the center of the array; Three inner connecting pipes 230 that connect the top of each array tube 210 to the side wall of the central common cavity 220; Three outer connecting pipes 240 that guide the top of each array tube 210 to the side wall of the furnace 100; And a guide pipe 250, one end of which is connected to the outer connecting pipe 240, and the other end is embedded in the annular channel 140 with a notch 260 in the embedded part. One end of the guide pipe 250 passes through the wall of the furnace 100 and is set in the gasification gas outlet 130 for outputting gasification gas.

[0025] In this embodiment, the bottom inlets of the three array tubes are located near the upper part of the interface between the dry distillation section and the gasification section, that is, at 1 / 5 to 1 / 6 of the height of the dry distillation section, to ensure that the high-temperature gas that has completed the main gasification reaction is collected. Of the three outer guide tubes, only one is directly connected to the external gasification gas outlet main pipe, and the ends of the other two are located in the annular channel. The ends of the three guide tubes converge in the top area of ​​the annular channel, forming a common connected area with a significantly expanded flow cross section. This causes the gas flowing out of the guide tubes (ports or gaps) to suddenly decrease in velocity and the flow to become gentle. In this common connected area, due to the decrease in velocity and the change in flow direction, the denser tar droplets and dust and other heavy components in the gas are easily separated from the mainstream gas under the action of inertial force and gravity, and slide down along the inner wall of the annular channel, returning to the gasification section for secondary reaction. The mainstream gasification gas, driven by pressure, is stably output through the end of one of the guide tubes connected to the external gasification gas outlet main pipe.

[0026] In this embodiment, raw coal is added through an offset coal inlet and falls onto a rotating tower grate, forming a uniform material layer. The material layer passes through a dry distillation section and a gasification section from top to bottom, with ash and slag discharged through the grate. During gasification and collection, a gasifying agent is introduced from a bottom gas supply device, generating high-temperature gasified gas in the combustion chamber of the gasification section. This gas rises and is collected from a specific radial position by three evenly distributed array tubes. The gas is split at a confluence mechanism; one portion enters the central common cavity through an inner connecting pipe, where its sensible heat indirectly heats the coal in the dry distillation section through the cavity wall. The other portion flows to the gasified gas outlet through an outer connecting pipe and a guide pipe. In the guide pipe, some gas containing heavy components enters the annular channel of the furnace wall through a gap and returns to the high-temperature zone below for secondary reaction. The purified mainstream gas is then output from the gasified gas outlet.

[0027] Traditional single-center tubes are located at the very center of the furnace. In ultra-large furnaces, this often results in the highest temperature in the central area, while the peripheral areas, due to longer heat transfer distances and weaker airflow distribution, tend to have lower temperatures. This radial temperature unevenness creates a breeding ground for tar (insufficient tar cracking in the low-temperature zone). In this embodiment, three array tubes are arranged in the most active and temperature-uniform area of ​​the furnace (the central region). This allows for the uniform upward transfer of the sensible heat of the high-temperature gas to the entire cross-section of the dry distillation section, reducing the amount of heavy tar generated due to localized low temperatures. Even if some heavy tar is generated, it will accumulate at the bottom of the guide tube as it rises with the gas due to its high inertia and easy condensation. At this point, through the backflow path formed by the notch and the annular channel, this portion of heavy tar is actively guided back to the high-temperature combustion chamber of the lower gasification section, where it undergoes secondary cracking and is converted into effective gases such as small molecules of CO and H2, thereby reducing the total tar content in the final outlet gas. Meanwhile, traditional single-center tubes are prone to entraining fine fly ash particles generated in the gasification section. In this embodiment, an array of three smaller diameter tubes (compared to the diameter of a traditional single center tube) is used. Under the same total gas volume, the local flow velocity at the inlet of a single array tube is reduced, thereby reducing the entrainment force of the airflow on the particles on the bottom ash layer surface.

[0028] The uneven airflow caused by a traditional single-center tube, with a strong center and weak edges, leads to insufficient contact between the gasifying agent (oxygen, steam) and coke in the edge area. Some carbon is discharged unreacted with the ash, resulting in a low carbon conversion rate. In this embodiment, three array tubes are evenly distributed above the active reaction zone, effectively providing three uniform extraction points in the furnace. This promotes a more uniform airflow distribution across the entire cross-section in the lower gasification section, allowing oxygen and steam to contact the coke bed more fully and evenly, reducing dead zones and ensuring that most of the carbon is effectively converted during its first pass through the bed. The incompletely burned fine carbon particles (carbon-containing fly ash) carried by the airflow, as well as residual carbon entering the annular channel with the returned tar, will have a second reaction opportunity after returning to the high-temperature combustion chamber, directly improving the overall carbon conversion rate.

[0029] This embodiment achieves multi-point uniform gas collection and initial separation through a triple-tube central structure. The triple-tube structure ensures uniform radial heating in the dry distillation section, reducing tar generation at the source. Then, through gaps and annular channels, heavy tar, unburned fine carbon particles, and fly ash are forced back to the combustion chamber of the gasification section for secondary cracking, reducing the tar content of the outlet gas. The array tube dispersion reduces the inlet flow rate, effectively reducing fly ash entrainment in the gas. The uniform extraction points optimize the distribution of gasifying agent in the bed, effectively improving the carbon conversion rate.

[0030] In an optional embodiment, such as Figure 1As shown, the central axis of the three array tubes 210 is located on the same circumference with the central axis of the furnace 100 as the center and the radius between 1 / 4 and 1 / 2 of the furnace radius.

[0031] In this embodiment, the three array tubes are arranged in an annular area with a furnace radius of 1 / 4 to 1 / 2. This is precisely the area where the gasification reaction is most active and the temperature is most uniform. The sensible heat of the high-temperature coal gas is uniformly transferred upward to the entire cross-section of the furnace in the dry distillation section, avoiding the existence of low-temperature zones at the edges. This creates conditions for uniform and complete dry distillation of coal and reduces the heavy tar produced due to local low temperatures.

[0032] In an optional embodiment, such as Figure 2 and Figure 3 As shown, the flow cross-sections of the inner connecting pipe 230 and the outer connecting pipe 240 gradually decrease from the end connected to the array pipe 210 to the other end.

[0033] This embodiment optimizes airflow dynamics to prevent tar and dust from accumulating and clogging at the joints, thus improving the long-term stability of the system. Fly ash particles have a high density and inertia. When the gas flows from the vertically rising array tubes to the horizontally flowing, tapering outer connecting pipes and guide pipes, the flow direction changes almost at a right angle. At this point, the fly ash particles with high inertia are difficult to flexibly change direction with the airflow and are more likely to lose kinetic energy by impacting the pipe walls at bends, or accumulate in the low-velocity boundary layer region at the bottom of the guide pipes. Ultimately, they are carried away by the backflow through the gaps and annular channels, reducing their entry into the gasification gas outlet.

[0034] In an optional embodiment, such as Figures 1 to 3 As shown, the guide pipe 250 is horizontally arranged, with one end connected to the outer connecting pipe 240 via a flange, and the other end passing through the inner wall of the furnace 100 into the annular channel 140. The notch is formed at the bottom of the guide pipe wall. In this embodiment, heavier, unreacted, and unburned substances are actively guided into the annular channel for backflow, achieving active control of the outlet gas quality.

[0035] In an optional embodiment, such as Figure 1 As shown, the furnace 100 is provided with a furnace top cover 150, and the furnace top cover 150 is provided with a dry distillation gas outlet 160 that communicates with the interior of the furnace 100. This embodiment achieves complete separation of dry distillation gas and gasification gas, laying the foundation for separate purification and high-value utilization (such as dry distillation gas to natural gas), and improving economic efficiency.

[0036] In an optional embodiment, such as Figure 1As shown, the furnace top cover 150 is provided with a coal feeding port 170, which is eccentrically positioned relative to the central axis of the furnace 100. The coal feeding port 170 is connected to the coal bunker 172 via a coal feeding mechanism 171. The amount of coal fed is controlled by controlling the coal feeding valve of the coal feeding mechanism 171. This coal feeding mechanism is implemented using a coal feeding device in the prior art, which will not be elaborated here. This embodiment adopts an offset coal feeding port design to ensure uniform material distribution over a very large area, which is a prerequisite for ensuring uniform gasification reaction in the subsequent process, and corresponds to the uniform gas collection function of the triple-tube central pipe.

[0037] In an optional embodiment, such as Figure 1 As shown, a rotatable tower grate 300 is located at the center of the gasification section 110. The grate (or furnace plate), serving as a movable base supporting the entire fuel bed, can slowly rotate around its central axis. An ash pan 310 is located on the outer side of the grate for discharging ash and slag. The rotational motion, combined with the eccentric coal feed port, spreads the falling coal into a uniformly thick annular material strip on the bed. This continuous and uniform material distribution improves the uniformity of the gasification reaction across the entire cross-section.

[0038] In an optional embodiment, such as Figure 1 As shown, the furnace wall of the gasification section 110 is equipped with a water jacket, which includes an upper atmospheric pressure water jacket 111 and a lower high-pressure water jacket 112. This embodiment employs differentiated thermal protection. The high-pressure water jacket is located in the furnace wall between the oxide layer and the core area of ​​the combustion chamber, where the heat flux density is extremely high and the temperature is highest. The high-pressure design (typically >1.6 MPa) aims to increase the boiling point of the cooling water, prevent the formation of a vapor film that affects heat transfer, and ensure that a large amount of heat is carried away, thus preventing furnace wall burn-through and ensuring safety. The atmospheric pressure water jacket is located in the upper part of the gasification section, where the heat load is relatively low, mainly recovering medium- and low-temperature sensible heat. The atmospheric pressure design simplifies the system and reduces manufacturing and maintenance costs.

[0039] In an optional embodiment, such as Figure 1 As shown, a number of fire detection holes 180 are provided on the upper part of the gasification section 110 and on the radial outer side of the annular channel 140. The fire detection holes are designed with different angles and are located on the radial outer side of the annular channel to avoid damaging the structural integrity and airtightness of the annular channel by opening the holes. They are located on the upper part of the gasification section, which makes it easy to directly observe the position, thickness and combustion status of the combustion layer (fire layer).

[0040] In an optional embodiment, such as Figure 1 As shown, the bottom of the furnace 100 is provided with a gas supply device for introducing oxidant and gasifying agent. The gas supply device includes, in sequence along the gas inlet direction, a dry check valve 410, a bent flow meter 420, an electric regulating butterfly valve 430, a steam mixer 440, and an air chamber 450 located directly below the tower grate 300.

[0041] In this embodiment, the dry check valve is used to prevent backflow of furnace gas into the return air pipe under abnormal conditions, which could lead to an explosion. The elbow flow meter is used to measure the total gasifying agent (air / oxygen) flow rate online. The electrically adjustable butterfly valve adjusts the gas flow rate into the furnace according to the flow meter signal and process requirements to achieve load control. The steam mixer uniformly mixes the regulated gasifying agent with superheated steam to form the final gasification medium. The air chamber is located directly below the grate, and its function is to evenly distribute the mixed gasifying agent to the bottom of the grate, ensuring uniform gas distribution at the bottom of the bed. The control methods and implementation principles of this embodiment, such as adjusting the gas flow rate into the furnace according to the flow meter signal and process requirements, the steam mixing method, and the uniform flow distribution in the air chamber, can be achieved using conventional methods of existing technology, and will not be elaborated here.

[0042] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A super-large triple-unit central tube rotary bed gasifier, characterized in that, include: The furnace (100) has a gasification section (110) with a relatively large cross-sectional area and a dry distillation section (120) with a relatively small cross-sectional area. The upper part of the dry distillation section (120) is provided with a gasification gas outlet (130) in the transverse direction. The wall of the furnace (100) is provided with an annular channel (140) extending in the circumferential direction. The lower end of the annular channel (140) is connected to the gasification section (110). The triple-tube central tube assembly (200), located at the upper position in the distillation section (120), includes three array tubes (210) arranged in a circular array with reference to the central axis of the furnace (100) and a confluence mechanism connected to the top of the three array tubes (210). The central axis of the three array tubes (210) is located on the same circumference with the central axis of the furnace (100) as the center and the radius between 1 / 4 and 1 / 2 of the radius of the furnace (100). The confluence mechanism includes: A central common cavity (220) located at the center of the array; Three inner connecting tubes (230) that connect the top of each array tube (210) to the side wall of the central common cavity (220). Three outer connecting pipes (240) guide the top of each array tube (210) to the side wall of the furnace (100). The flow cross section of the inner connecting pipe (230) and the outer connecting pipe (240) gradually decreases from the end connected to the array tube (210) to the other end. And a guide pipe (250), one end of which is connected to the outer connecting pipe (240), and the other end is embedded in the annular channel (140) with a notch (260) in the embedded part. One end of the guide pipe (250) passes through the wall of the furnace (100) and is set in the gasification gas outlet (130) for outputting gasification gas. The guide pipe (250) is set horizontally, one end of which is connected to the outer connecting pipe (240) through a flange, and the other end passes through the inner wall of the furnace (100) to the annular channel (140). The notch (260) is opened on the bottom pipe wall of the guide pipe (250).

2. The ultra-large triple-unit central tube rotary bed gasifier according to claim 1, characterized in that: The furnace (100) is provided with a furnace top cover (150) at the top, and the furnace top cover (150) is provided with a dry distillation gas outlet (160) communicating with the interior of the furnace (100).

3. The ultra-large triple-unit central tube rotary bed gasifier according to claim 2, characterized in that: The furnace top cover (150) is provided with a coal feeding port (170), which is eccentrically positioned relative to the central axis of the furnace (100).

4. The ultra-large triple-unit central tube rotary bed gasifier according to claim 1, characterized in that: The gasification section (110) is equipped with a rotatable tower grate (300) at its center.

5. The ultra-large triple-unit central tube rotary bed gasifier according to claim 4, characterized in that: The furnace (100) wall of the gasification section (110) is provided with a water jacket, which includes an upper atmospheric pressure water jacket (111) and a lower high pressure water jacket (112).

6. The ultra-large triple-unit central tube rotary bed gasifier according to claim 5, characterized in that: Several fire detection holes (180) are provided on the upper part of the gasification section (110) and on the radial outer side of the annular channel (140).

7. The ultra-large triple-unit central tube rotary bed gasifier according to claim 5, characterized in that: The bottom of the furnace (100) is provided with a gas supply device for introducing gasifying agent. The gas supply device includes, in sequence along the gas inlet direction, a dry check valve (410), a bent flow meter (420), an electric regulating butterfly valve (430), a steam mixer (440), and an air chamber (450) located directly below the tower grate (300).

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