Double-flue external heating type gasification device

Abstract

The invention provides a double-flue external heating type gasification device, which comprises a furnace body, a heat exchanger, a heat exchanger, a heat exchanger, a heat exchanger, a heat exchanger and a heat exchanger, wherein an accommodating space is formed in the furnace body; the outer furnace wall is arranged on the outer side of the furnace body, and an outer flue is formed between the outer furnace wall and the furnace body; the flue gas pipeline is vertically mounted in the accommodating space, and the upper part of the flue gas pipeline is communicated with the outer flue through a pipe fitting; the flue gas supply assembly is installed below the flue gas pipeline and suitable for providing flue gas into the flue gas pipeline from the lower portion, and the flue gas rises in the flue gas pipeline and then is discharged downwards from the bottom through the outer flue through a pipe fitting. The two-way heating device can indirectly and uniformly perform two-way heating on gasification raw materials flowing downwards and gasification agents flowing upwards in the containing space, so that the gasification raw materials are subjected to gasification reaction, the temperature of the containing space is kept high in the process that flue gas is discharged through the outer flue, sufficient gasification reaction is facilitated, and the gasification efficiency is improved.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to the field of gasification technology, and in particular to a double-flue external heating gasification device. Background Art

[0002] Current gasification technologies are mainly internally heated fluidized bed, molten bed and fluidized bed, all of which mainly use oxygen / air as gasifying agents. It is necessary to burn part of the raw materials during the gasification reaction to provide heat for the gasification process in order to ensure the continuous progress of the gasification reaction.

[0003] The heat source of the internal heat coal gasification method is single, and it sacrifices part of the raw materials. The external heat gasification method can utilize various forms of external heat sources, such as waste high-temperature flue gas, high-temperature flue gas generated by burning low-grade energy and waste fuel gas, high-temperature flue gas generated by burning part of the self-produced part of the synthesis gas, and other new energy sources such as light heat and electricity, which is conducive to improving the conversion rate of the gasification process and the effective gas yield of the device.

[0004] However, the traditional external heating gasification technology has a simple structure and low heat transfer efficiency due to the single-sided radiation method, making it difficult to effectively and quickly transfer heat to the raw coal in the furnace to maintain a stable reaction environment. Summary of the invention

[0005] In view of this, the present disclosure provides a double-flue external heating gasification device, which can improve the heat transfer efficiency.

[0006] As one aspect of an embodiment of the present disclosure, a double-flue external heating gasification device is provided, comprising a furnace body, an outer furnace wall, a flue gas duct and a flue gas supply assembly. A storage space is formed inside the furnace body, and the outer furnace wall is arranged on the outside of the furnace body, and an external flue gas is formed between the outer furnace wall and the furnace body. The flue gas duct is installed upright in the storage space, and the upper part of the flue gas duct is connected with the external flue gas through a pipe fitting. The flue gas supply assembly is installed below the flue gas duct, and is suitable for providing flue gas from the bottom to the flue gas duct, wherein the flue gas rises in the flue gas duct, and then passes through the pipe fitting and is discharged downward from the bottom via the external flue gas, so as to heat the gasification raw materials flowing downward in the storage space and the gasification agent flowing upward, so that the gasification raw materials undergo a gasification reaction.

[0007] According to an embodiment of the present disclosure, the furnace body further includes a feed pipe. The feed pipe passes through the outer furnace wall and is installed on the top of the furnace body to communicate with the accommodation space, wherein the gasified raw material from the outside enters the accommodation space via the feed pipe. The flue gas duct is located below the feed pipe, and the top of the flue gas duct is configured to be conical, so that the gasified raw material falling on the top of the flue gas duct is evenly dispersed in the accommodation space.

[0008] According to an embodiment of the present disclosure, the above-mentioned flue gas supply assembly includes a tubular member, which is extended in a horizontal direction and arranged below the above-mentioned flue gas duct and is connected to the above-mentioned flue gas duct. The above-mentioned tubular member passes through the two facing sides of the above-mentioned furnace body to guide the above-mentioned flue gas into the above-mentioned flue gas duct.

[0009] According to an embodiment of the present disclosure, the flue gas supply assembly further comprises a pair of burners, which are symmetrically arranged at both ends of the axial direction of the tubular member and are suitable for providing the flue gas by burning fuel.

[0010] According to an embodiment of the present disclosure, each of the above-mentioned burners includes a central channel, a gas fuel channel, a solid fuel channel and a combustion-supporting channel. The central channel is suitable for providing primary air or oxygen into the above-mentioned tubular member, and the gas fuel channel is arranged at the periphery of the above-mentioned central channel, and is suitable for conveying gas fuel into the above-mentioned tubular member, so that the above-mentioned gas fuel and the above-mentioned primary air or oxygen are preliminarily burned at the end of the above-mentioned nozzle. The solid fuel channel is arranged at the periphery of the above-mentioned gas fuel channel, and is suitable for conveying solid fuel into the above-mentioned tubular member. The combustion-supporting channel is arranged at the periphery of the above-mentioned solid fuel channel, and is suitable for conveying secondary air or oxygen into the above-mentioned tubular member, so as to mix with the above-mentioned solid fuel under the temperature environment provided by the above-mentioned preliminary combustion, and fully burn to provide the above-mentioned flue gas.

[0011] According to an embodiment of the present disclosure, a gas outlet is provided at the upper portion of the furnace body, which is suitable for allowing the target gas generated by the gasification reaction between the gasification raw material and the gasification agent to be discharged. A discharge port is provided at the bottom of the furnace body, which is suitable for allowing the residue generated by the gasification reaction of the gasification raw material to be discharged.

[0012] According to an embodiment of the present disclosure, the furnace body further comprises an air distribution plate, which is obliquely installed between the periphery of the discharge port and the furnace body, so that an air chamber adjacent to the accommodation space is formed between the air distribution plate and the bottom wall and side wall of the furnace body. The gasifying agent from the outside enters the air chamber from the air inlet located at the lower part of the air chamber, and enters the accommodation space through the multiple through holes on the air distribution plate, contacts the gasification raw material in the accommodation space, and discharges the residue falling on the air distribution plate through the discharge port.

[0013] According to an embodiment of the present disclosure, the double-flue external heat type gasification device further includes an air supply assembly configured to blow loose air toward the discharge port to prevent the residue from accumulating at the discharge port.

[0014] According to an embodiment of the present disclosure, the pipe fitting is connected between the upper part of the flue gas duct and the upper part of the furnace body, and the flue gas outlet of the external flue is located at the lower part of the external furnace wall to extend the residence time of the flue gas in the external flue.

[0015] According to an embodiment of the present disclosure, baffles are arranged in the smoke duct and the external smoke duct, so that the smoke flows along a serpentine path in the smoke duct and the external smoke duct.

[0016] According to the double flue external heating gasification device of the embodiment of the present disclosure, by installing a flue gas duct upright in the furnace body and providing flue gas from the lower part of the flue gas duct through a flue gas supply assembly, the flue gas rises in the flue gas duct, and can indirectly and evenly heat the gasification raw materials flowing downward and the gasification agent flowing upward in the accommodation space, and then the temperature of the accommodation space is kept high in the process of the flue gas being discharged through the external flue, so that the gasification raw materials undergo a gasification reaction under the action of the gasification agent and the high temperature, which is conducive to the full progress of the gasification reaction and improves the gasification efficiency. Through the arrangement of the flue gas duct and the external flue gas duct, the high-temperature flue gas conducts heat transfer from the flue gas duct and the external flue gas duct to the accommodation space in opposite directions, increasing the contact area between the accommodation space and the high-temperature flue gas, realizing a multi-faceted radiation heat transfer method, providing a more uniform heat distribution for the accommodation space, improving the uniformity of heating, improving the heat utilization efficiency of the high-temperature flue gas, and reducing heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic top view of a double-flue external heating gasification device according to an embodiment of the present disclosure is shown;

[0019] Figure 2 Schematically shows Figure 1 A cross-sectional view of the double-flue external heat gasification device taken along line AA shown; and

[0020] Figure 3 A partial cross-sectional view of a combustor according to an embodiment of the present disclosure is schematically shown.

[0021] Description of reference numerals:

[0022] 1-furnace body;

[0023] 11- Accommodation space;

[0024] 12-feed pipe;

[0025] 13-discharging port;

[0026] 14-gas distribution plate;

[0027] 15-air chamber;

[0028] 16- Air inlet;

[0029] 17- Pipe fittings;

[0030] 2-External furnace wall;

[0031] 3-External flue;

[0032] 31-smoke outlet;

[0033] 4- Flue gas duct;

[0034] 5- Smoke supply assembly;

[0035] 51- tubular part;

[0036] 52-burner;

[0037] 521-Central channel;

[0038] 522-gas fuel channel;

[0039] 523-Solid fuel channel;

[0040] 524-combustion channel;

[0041] 6-Baffle. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0043] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0044] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0045] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0046] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0047] Figure 1 The top view of the double flue external heating gasification device according to the embodiment of the present disclosure is schematically shown. Figure 2 Schematically shows Figure 1 A cross-sectional view of AA of a double-flue external heating gasification device is shown.

[0048] As one aspect of the embodiments of the present disclosure, a double-flue external heat gasification device is provided. Figure 1 and Figure 2 As shown, the double flue external heating gasification device includes a furnace body 1, an outer furnace wall 2, a flue gas duct 4 and a flue gas supply assembly 5. A storage space 11 is formed inside the furnace body 1, and the outer furnace wall 2 is arranged outside the furnace body 1, and an outer flue 3 is formed between the furnace body 1 and the outer furnace wall 2. The flue gas duct 4 is installed upright in the storage space 11, and the upper part of the flue gas duct 4 is connected with the outer flue duct 3 through a pipe 17. The flue gas supply assembly 5 is installed below the flue gas duct 4, and is suitable for providing flue gas from the bottom to the flue gas duct 4, wherein the flue gas rises in the flue gas duct 4, and then the flue gas is discharged through the outer flue duct 3 to heat the gasification raw materials flowing downward in the storage space 11 and the gasification agent flowing upward, so that the gasification raw materials undergo a gasification reaction.

[0049] According to the double flue external heating gasification device of the embodiment of the present disclosure, by installing the flue gas duct 4 upright in the furnace body 1, and providing flue gas from the lower part of the flue gas duct 4 through the flue gas supply assembly 5, the flue gas rises in the flue gas duct 4, and can indirectly and evenly heat the gasification raw materials flowing downward and the gasification agent flowing upward in the storage space 11, and then the temperature of the storage space 11 is kept high in the process of the flue gas being discharged through the external flue duct 3, so that the gasification raw materials undergo a gasification reaction under the action of the gasification agent and the high temperature, which is conducive to the full progress of the gasification reaction and improves the gasification efficiency. Through the arrangement of the flue gas duct 4 and the external flue duct 3, the high-temperature flue gas conducts heat transfer from the flue gas duct 4 and the external flue duct 3 to the storage space 11 in opposite directions, increasing the contact area between the storage space 11 and the high-temperature flue gas, realizing a multi-faceted radiation heat transfer method, providing a more uniform heat distribution for the storage space 11, improving the uniformity of heating, improving the heat utilization efficiency of the high-temperature flue gas, and reducing heat loss.

[0050] According to the embodiments of the present disclosure, Figure 2 As shown, the pipe 17 is connected between the upper part of the flue gas duct 4 and the upper part of the furnace body 1, and the flue gas outlet 31 of the outer flue 3 is located at the lower part of the outer furnace wall 2. In this way, the residence time of the flue gas in the flue gas duct 4 and the outer flue 3 can be extended, thereby improving the heat exchange efficiency.

[0051] In an illustrative embodiment, Figure 1 As shown, the furnace body 1 includes but is not limited to being configured into a cylindrical or cubic cylindrical structure.

[0052] In an exemplary embodiment, the outer furnace wall 2 can be built with refractory bricks and heat-insulating castables, and the furnace body 1 can be built with refractory heat-conducting materials. An annular outer flue 3 is formed between the furnace body 1 and the outer furnace wall 2.

[0053] In an illustrative embodiment, the outer furnace wall 2 is built with silicon carbide refractory bricks and thermal insulation castables, and the exterior is a steel shell.

[0054] According to an embodiment of the present disclosure, the gasification raw material may be carbon-based energy such as coal tar, coal, biomass, etc.

[0055] In an exemplary embodiment, the pipe 17 may be a heat-resistant steel pipe lined with a refractory material.

[0056] According to an embodiment of the present disclosure, a gas outlet (not shown in the figure) is disposed at the upper portion of the furnace body 1 , which is suitable for allowing the target gas generated by the gasification reaction between the gasified raw material and the gasifying agent to be discharged.

[0057] According to the embodiments of the present disclosure, Figure 2As shown, a discharge port 13 is provided at the bottom of the furnace body 1 , and the discharge port 13 is suitable for allowing the residue (for example, ash) generated after the gasification reaction of the gasified raw material to be discharged.

[0058] In an illustrative embodiment, the gasification raw material is reversely contacted with the gasifying agent (e.g., CO2 or H2O) under a high temperature environment to produce a gasification reaction, and the generated target gas with CO as the main component is drawn out from the gas outlet at the upper part of the gasification channel, and the harmless residue produced by the gasification is discharged through the discharge port 13 at the bottom.

[0059] According to the embodiments of the present disclosure, Figure 2 As shown, the furnace body 1 further includes an air distribution plate 14. The air distribution plate 14 is obliquely installed between the periphery of the discharge port 13 and the furnace body 1, so that an air chamber adjacent to the accommodation space 11 is formed between the air distribution plate 14 and the bottom wall and side wall of the furnace body 1. The gasifying agent from the outside enters the air chamber 15 from the air inlet 16 located at the lower part of the air chamber, and enters the accommodation space 11 through the multiple through holes on the air distribution plate 14, contacts the gasified raw materials in the accommodation space 11, and causes the residues falling on the air distribution plate 14 to be discharged through the discharge port 13.

[0060] In such an embodiment, the gas chamber 15 can stabilize the gasifying agent pressure, ensure that the gasifying agent can evenly pass through the through holes on the gas distribution plate 14, and further cool the residue around the discharge port 13, ensuring that the temperature of the discharge port 13 is controlled within the reasonable use temperature range of the material.

[0061] In an illustrative embodiment, Figure 2 As shown, the gas distribution plate 14 may be a conical structure, made of heat-resistant steel. The bottom of the gas distribution plate 14 is a discharge port 13, which is connected to the outside and is a discharge channel for the gasified residue.

[0062] In an illustrative embodiment, the gas distribution plate 14 is provided with evenly distributed through holes, and the gas distribution plate 14 is used to support the residue and adjust the distribution of the gasifying agent so that the gasifying agent entering the containing space 11 is evenly distributed.

[0063] In an illustrative embodiment, the angle between the gas distribution plate 14 and the horizontal plane can be between 15 and 70 degrees (for example, 15 degrees, 20 degrees, 30 degrees, 45 degrees, 60 degrees or 70 degrees) to promote the flow of residue to the discharge port 13 and improve the distribution of the gasification agent in the containing space 11.

[0064] In such an embodiment, the gasifying agent passing through the gas distribution plate 14 and the residue remaining after the gasification reaction of the gasification raw material are contacted and heat exchanged in reverse direction, the temperature of the residue is reduced, and the temperature of the gasifying agent is preheated to the gasification reaction temperature.

[0065] According to an embodiment of the present disclosure, the double flue external heat gasification device further includes an air supply assembly (not shown in the figure). The air supply assembly is configured to blow loose air toward the discharge port 13 to prevent residues from accumulating at the discharge port 13 .

[0066] In an illustrative embodiment, the dual-flue external heating gasification device further includes a valve (not shown in the figure), which cooperates with the loosening air component to allow or prevent the loosening air component from blowing loosening air toward the discharge port 13.

[0067] According to the embodiments of the present disclosure, Figure 2 As shown, baffles 6 are arranged in the smoke duct 4 and the outer smoke duct 3, so that the smoke flows along a serpentine path in the smoke duct 4 and the outer smoke duct 3, thereby prolonging the residence time of the smoke in the smoke duct 4 and the outer smoke duct 3.

[0068] In an illustrative embodiment, the baffle plate 6 may be made of heat-resistant steel.

[0069] According to the embodiments of the present disclosure, Figure 1 and Figure 2 As shown, the furnace body 1 further includes a feed pipe 12. The feed pipe 12 passes through the outer furnace wall 2 and is installed on the top of the furnace body 1 to communicate with the accommodation space 11, wherein the gasified raw materials from the outside enter the accommodation space 11 via the feed pipe 12. The flue gas duct 4 is located below the feed pipe 12, and the top of the flue gas duct 4 is configured to be conical, so that the gasified raw materials falling on the top of the flue gas duct are evenly dispersed in the accommodation space 11, which can prevent the raw materials from being concentrated, thereby ensuring that the gasification reaction in the entire accommodation space 11 is more uniform, which helps to improve the gasification efficiency.

[0070] According to the embodiments of the present disclosure, Figure 1 and Figure 2 As shown, the flue gas supply assembly 5 includes a tubular member 51 , which extends horizontally and is arranged below the flue gas duct 4 and is connected to the flue gas duct 4 . The tubular member 51 passes through two facing sides of the furnace body 1 to guide the flue gas into the flue gas duct 4 .

[0071] According to an embodiment of the present disclosure, the flue gas supply assembly 5 further comprises a pair of burners 52. The pair of burners 52 are symmetrically arranged at both ends of the axial direction of the tubular member 51, and are suitable for providing flue gas by burning fuel.

[0072] In an illustrative embodiment, the fuel may include a mixture of one or more of low-grade pulverized coal, biomass, or coal pyrolysis gas.

[0073] In an exemplary embodiment, the smoke supply assembly 5 includes two tubular members 51, which are arranged perpendicularly to each other below the smoke duct 4 and communicate with the smoke duct 4. It is understandable that the smoke supply assembly 5 may also include 1 or 3 tubular members 51, and the specific number may be selected according to actual needs.

[0074] In an exemplary embodiment, a pair of burners 52 are disposed opposite to each other at both ends of each tubular member 51. Specifically, the combustion flame of each burner 52 is sprayed into the tubular member 51, so that the tubular member 51 has the function of a furnace, and the smoke generated by the combustion is also discharged from the tubular member 51 to the smoke pipe 4 and transported upward, so as to stably and evenly heat the gasified raw materials. The tubular member 51 includes but is not limited to being made of heat-resistant steel.

[0075] In an illustrative embodiment, an air inlet 16 for allowing the gasification agent to enter is disposed at the bottom of the air chamber 15 , and the air inlet 16 is disposed parallel to and opposite to the smoke outlet 31 and the burner 52 .

[0076] Figure 3 A partial cross-sectional view of a combustor according to an embodiment of the present disclosure is schematically shown.

[0077] According to the embodiments of the present disclosure, Figure 3 As shown, each burner 52 includes a central channel 521, a gas fuel channel 522, a solid fuel channel 523 and a combustion-supporting channel 524. The central channel 521 is suitable for providing primary air or oxygen into the tubular member 51. The gas fuel channel 522 is arranged at the periphery of the central channel, and is suitable for conveying gas fuel into the tubular member 51, so that the gas fuel and the primary air or oxygen are preliminarily burned at the end of the nozzle. The solid fuel channel 523 is arranged at the periphery of the gas fuel channel 522, and is suitable for conveying solid fuel into the tubular member 51. The combustion-supporting channel 524 is arranged at the periphery of the solid fuel channel 523, and is suitable for conveying secondary air or oxygen into the tubular member 51, so as to mix with the solid fuel under the temperature environment provided by the preliminary combustion, and fully burn to provide flue gas.

[0078] In an alternative embodiment, the combustion of the fuel may be carried out inside the burner 52 , and the high-temperature flue gas generated by the burner 52 is sprayed into the tubular member 51 .

[0079] In such an embodiment, the tubular member 51 introduces the high-temperature flue gas into the flue gas duct 4. The high-temperature flue gas rises in the flue gas duct 4, enters the external flue 3 through the pipe 17, and is discharged from the flue gas outlet. During the movement of the high-temperature flue gas, the heat is diffused into the containing space 11 through the flue gas duct 4 and the wall of the external flue duct 3 on both sides of the containing space 11. The multi-faceted radiation heat transfer method increases the heat transfer area, improves the heat supply per unit time, and reduces the lateral heat transfer radius between the gasification raw material in the containing space 11 and the heat source, thereby ensuring the radiation intensity of the heat source and being able to provide heat for the gasification process in a timely and stable manner.

[0080] In an illustrative embodiment, the burner 52 may be cylindrical, with a diameter of 200 to 400 mm, and adopts a four-channel design, including a central channel 521, a gas fuel channel 522, a solid fuel channel 523, and a combustion-supporting channel 524 from the inside to the outside. The width of each channel may be 10 to 50 mm, and it is in the shape of a ring. The nozzles at the ends of the three outer channels narrow toward the central channel, forming a horizontal angle of 10 to 30 degrees, and each end of the channel (the end close to the tubular member 51) is protected by a cooling water jacket. The gas fuel is initially burned with the primary air / oxygen at the nozzle at the end of the burner 52 (the end extending into the tubular member 51), and then the solid fuel is fully burned with the secondary air / oxygen in the tubular member 51 to produce high-temperature flue gas.

[0081] In an illustrative embodiment, the flue gas outlet 31 is located below the burner 52, and the flue gas outlet 31 is arranged parallel to the burner 52. The waste flue gas is discharged from the flue gas outlet 31 after heat exchange, and the heat carried by the waste flue gas can be reused downstream through waste heat utilization methods such as heat exchangers and dryers.

[0082] In an exemplary embodiment, the burner 52 includes but is not limited to burning low-rank coal and / or biomass fuel under air conditions to produce high-temperature flue gas. In this way, it can replace the current combustion method of pure oxygen combustion, and does not require the configuration of air separation equipment to produce oxygen, thereby avoiding the high-grade power consumption of the air separation equipment.

[0083] In an illustrative embodiment, coal char is used as the gasification raw material and CO2 is used as the gasification agent. The raw coal char with a particle size of 2 to 50 mm after screening passes through the feed pipe 12 and enters the accommodation space 11. The raw coal char slowly moves downward under the action of gravity. The fuel and air are evenly mixed and sent to the burner 52 to burn and generate high-temperature flue gas of 1200-1400°C, which provides heat for the gasification reaction of the gasification raw material and the gasification agent in the accommodation space 11.

[0084] According to the double-flue external heating gasification device of the embodiment of the present disclosure, compared with the traditional single-sided radiation external heating device, the "sandwich-type containing space 11" multi-sided radiation method is adopted, which increases the inner heat transfer surface of the containing space 11. While increasing the heat exchange area of ​​the containing space 11, the inner and outer heat transfer surfaces of the containing space 11 simultaneously transfer heat to the containing space 11 in two directions, shortening the heat transfer radius and ensuring the uniformity and stability of the heat in the containing space 11.

[0085] According to the embodiments of the present disclosure, the burner 52 can utilize low-grade energy raw materials or a mixture of multiple raw materials, such as cheap low-grade foamed coal, industrial exhaust gas from a park, etc., and burn them with air or pure oxygen to provide heat for the gasification reaction, thereby reducing operating costs and improving the technical and economic efficiency of the gasification process.

[0086] In an illustrative embodiment, the fuel can be industrial residual lignite foam, coke foam and pure oxygen. While providing heat for the gasification reaction, the main component of the high-temperature flue gas is carbon dioxide (CO2). The high-temperature CO2 at the flue gas outlet can be directly sent into the containing space 11 as a gasifying agent to react with the gasification raw material, thereby converting the exhaust gas mainly into raw materials and making full use of its sensible heat.

[0087] In an alternative embodiment, the burner 52 uses air combustion, and the high-temperature waste flue gas of 800-1000°C discharged from the flue gas outlet exchanges heat with the CO2 gasifying agent in an external heat exchanger, thereby fully utilizing the waste heat of the high-temperature flue gas to preheat the gasifying agent.

[0088] In an illustrative embodiment, CO2 introduced from the air inlet 16 enters the gas chamber 15, flows upward through the through holes on the air distribution plate 14, enters the containing space 11, and contacts the coke flowing downward in reverse direction under the temperature condition of 900-1100°C to generate a gasification reaction to generate carbon monoxide (CO). The heat required for the gasification reaction is provided by the high-temperature flue gas in the flue gas duct 4 and the external flue 3 through indirect heat transfer.

[0089] As CO2 flows from bottom to top, its concentration gradually decreases, and the concentration of CO gradually increases until CO2 is completely reacted. CO is discharged from the gas outlet at the top of the containing space 11. The temperature of CO can reach 600-800°C, and it enters the downstream for comprehensive utilization, such as directly mixing with hydrogen (H2) produced in the water electrolysis process to produce chemicals.

[0090] The coal coke moves downward as it is consumed by the gasification reaction with the CO2 introduced from outside the furnace. The powdery ash produced after the coke gasification is concentrated at the bottom of the furnace. After heat exchange with the CO2 introduced from the gas distribution plate 14, it is discharged through the discharge port 13. The ash temperature after heat exchange can be reduced to 100~400℃.

[0091] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A double flue external heating gasification device, characterized in that: include: A furnace body, forming a containing space inside; An outer furnace wall is arranged outside the furnace body and forms an outer flue with the furnace body; A smoke duct is vertically installed in the accommodation space, and the upper part of the smoke duct is connected with the external flue through a pipe fitting; as well as A flue gas supply assembly is installed below the flue gas duct and is suitable for providing flue gas into the flue gas duct from the bottom, wherein the flue gas rises in the flue gas duct and is then discharged downward from the bottom through the pipe fitting via the external flue to heat the gasification raw materials flowing downward and the gasification agent flowing upward in the accommodating space, so that the gasification raw materials undergo a gasification reaction.

2. The double flue external heating gasification device according to claim 1, characterized in that: The furnace body also includes: a feed pipe, passing through the outer furnace wall and installed on the top of the furnace body to communicate with the accommodation space, wherein the gasification raw material from the outside enters the accommodation space via the feed pipe; The flue gas duct is located below the feed duct, and the top of the flue gas duct is configured to be conical, so that the gasified raw materials falling on the top of the flue gas duct are evenly dispersed in the accommodation space.

3. The double flue external heating gasification device according to claim 1, characterized in that: The smoke supply assembly comprises: The tubular member is horizontally extended and arranged below the smoke duct and communicated with the smoke duct. The tubular member passes through two opposite sides of the furnace body to guide the smoke into the smoke duct.

4. The double-flue external heating gasification device according to claim 3, characterized in that: The smoke supply assembly also includes: The paired burners are symmetrically arranged at two axial ends of the tubular member and are suitable for providing the flue gas by burning fuel.

5. The double-flue external heating gasification device according to claim 4, characterized in that: Each of the burners comprises: a central passage adapted to provide primary air or oxygen into the tubular member; A gas fuel channel, arranged at the periphery of the central channel, adapted to convey the gas fuel into the tubular member so that the gas fuel and the primary air or oxygen are preliminarily burned at the nozzle end; a solid fuel channel, disposed at the periphery of the gas fuel channel, adapted to transport the solid fuel into the tubular member; and The combustion-supporting channel is arranged at the periphery of the solid fuel channel and is suitable for conveying secondary air or oxygen into the tubular member so as to mix with the solid fuel under the temperature environment provided by the primary combustion and fully burn to provide the flue gas.

6. The double-flue external heating gasification device according to claim 1, characterized in that: The upper part of the furnace body is provided with a gas outlet, which is suitable for allowing the target gas generated by the gasification reaction between the gasification raw material and the gasification agent to be discharged; A discharge port is provided at the bottom of the furnace body, and the discharge port is suitable for allowing the residue generated by the gasification reaction of the gasified raw material to be discharged.

7. The double-flue external heating gasification device according to claim 6, characterized in that: The furnace body also includes: An air distribution plate is obliquely installed between the periphery of the discharge port and the furnace body, so that an air chamber adjacent to the accommodation space is formed between the air distribution plate and the bottom wall and side wall of the furnace body; Among them, the gasifying agent from the outside enters the air chamber from the air inlet located at the lower part of the air chamber, and enters the containing space through multiple through holes on the air distribution plate, contacts the gasification raw material in the containing space, and makes the residue falling on the air distribution plate be discharged through the discharge port.

8. The double-flue external heating gasification device according to claim 6, characterized in that: Also includes: The air supply component is configured to blow loose air toward the discharge port to prevent the residue from accumulating at the discharge port.

9. The double-flue external heating gasification device according to claim 1, characterized in that: The pipe is connected between the upper part of the flue gas duct and the upper part of the furnace body, and the flue gas outlet of the external flue is located at the lower part of the external furnace wall to extend the residence time of the flue gas in the external flue.

10. The double-flue external heating gasification device according to any one of claims 1 to 9, characterized in that: Baffles are arranged in the smoke duct and the outer smoke duct, so that the smoke flows along a serpentine path in the smoke duct and the outer smoke duct.

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