A two-stage biomass gasification mechanism

Abstract

The utility model belongs to the field of biomass gasification technology, especially relate to a two-stage gas production mechanism for biomass, a two-stage gas production mechanism for biomass, including front section gas production mechanism, charcoal gas separation tank, at least one connecting auger mechanism, rear section gas production mechanism, at least one discharging auger mechanism and dust collecting mechanism, the gas production mechanism is equipped with gas production mechanism feed inlet, gas production mechanism discharge port and combustible gas outlet, the charcoal gas separation tank is equipped with separation tank feed inlet, separation tank discharge port and separation tank combustible gas outlet, the outer wall of auger mechanism is equipped with auger mechanism feed inlet and auger mechanism discharge port, through increasing charcoal gas separation tank between front section gas production mechanism and rear section gas production mechanism and increasing protective gas inlet in connecting auger mechanism to input protective gas, maintaining positive pressure in connecting auger mechanism, preventing potential gas backflow risk, improving the quality of rear section gas production mechanism gas production and the safety of the utility model.

Description

Technical Field

[0001] This utility model belongs to the field of biomass gasification technology, and in particular relates to a two-stage biomass gasification mechanism. Background Technology

[0002] Biomass is a renewable organic material, encompassing all organic matter derived from living organisms, such as the accumulation of photosynthetic organisms by plants, animals, and microorganisms, and their excrement. It can be converted into solid, liquid, or gaseous fuels and used for power generation and the production of biofuels (such as bioethanol, biodiesel, and biogas). Biomass carbonization is the process of converting biomass raw materials (such as wood and straw) into carbon-rich solid products (biochar) and combustible gases under anaerobic or low-oxygen and high-temperature conditions. The utilization of biomass energy not only reduces dependence on fossil fuels but also helps mitigate the greenhouse effect, making it a renewable energy source of significant strategic importance. Currently, with increasing societal emphasis on environmental protection and renewable clean energy, the market demand for continuous, large-scale production of biomass carbonization and biochar gasification within a single facility is becoming increasingly urgent.

[0003] Chinese utility model CN222961376U discloses a two-stage biomass gasification mechanism, which includes a front-stage gasification mechanism, a connecting auger mechanism, a rear-stage gasification mechanism, a discharge auger mechanism, and an ash collection mechanism. The discharge and inlet ports of each mechanism are connected to each other sequentially. However, the gasification efficiency and safety of this mechanism are still insufficient. For example, the front-stage and rear-stage gasification mechanisms are only connected by the connecting auger mechanism, which may cause backflow of gas in the rear-stage gasification mechanism, resulting in cross-contamination of the gas in the two gasification mechanisms. In addition, the high temperature of the gasification mechanism during operation may also cause damage to the connection between the gasification mechanism and other equipment due to thermal expansion and contraction. Utility Model Content

[0004] In view of the problems that the gasification efficiency and safety of existing technologies are still insufficient, the purpose of this utility model is to provide a two-stage biomass gasification mechanism to solve the problems of existing technologies.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a two-stage biomass gasification mechanism, comprising a front-end gasification mechanism, a carbon-gas separation box, at least one connecting auger mechanism, a rear-end gasification mechanism, at least one discharge auger mechanism, and an ash collection mechanism. The gas production mechanism is equipped with a gas production mechanism inlet, a gas production mechanism outlet, and a combustible gas outlet; The carbon-gas separator is equipped with a separator inlet, a separator outlet, and a separator combustible gas outlet. The carbon-gas separator has two functions: first, to further promote the release of volatiles in the carbon; second, to separate the carbon and gas (volatiles), with the carbon falling to the bottom and the gas at the top and being discharged from the separator combustible gas outlet.

[0006] The outer wall of the auger mechanism is provided with an auger mechanism inlet and an auger mechanism outlet, and the interior is provided with an auger structure, which can be a shafted auger or a shaftless auger; after the biomass material enters the auger mechanism inlet, it is propelled by the auger structure within the auger mechanism and then enters the next connected mechanism through the auger mechanism outlet. The gas production mechanism of the front-end gas production mechanism is connected to the gas production mechanism outlet below the separation box inlet; The discharge port of the separation box is connected to the feed port of the auger mechanism. The auger mechanism outlet of the auger mechanism is connected to the gas generation mechanism inlet of the downstream gas generation mechanism below the auger mechanism outlet. The discharge port of the gas production mechanism of the rear gas production mechanism is connected to the feed port of the auger mechanism of the discharge auger mechanism below. The ash collection mechanism is connected below the discharge port of the discharge auger mechanism.

[0007] In some embodiments, at least one feeding auger mechanism is further provided above the gas generating inlet of the front gas generating mechanism; the structure of the feeding auger mechanism is the same as that of the auger mechanism; the gas generating inlet of the front gas generating mechanism is connected to the auger mechanism outlet of the feeding auger mechanism.

[0008] In some embodiments, the number of feeding auger mechanisms is at least two, wherein the auger mechanism outlet and auger mechanism inlet of the multiple feeding auger mechanisms are alternately connected. Setting multiple auger mechanisms before the pre-gasification mechanism can further reduce the air entering with the material before the reaction, which is beneficial to improving the controllability of the subsequent input gasifying agent content, thereby further improving the reaction effect of the pre-gasification mechanism.

[0009] In some embodiments, the number of connecting auger mechanisms is at least two, wherein the auger mechanism outlet and auger mechanism inlet of the plurality of connecting auger mechanisms are alternately connected.

[0010] In some embodiments, the number of discharge auger mechanisms is at least two, wherein the discharge port and the feed port of the plurality of discharge auger mechanisms are alternately connected.

[0011] In some embodiments, the downstream gasification mechanism further includes at least one vaporizing agent inlet, and a gas distributor is provided at the end of the vaporizing agent inlet for inputting and dispersing the vaporizing agent to improve reaction efficiency. Preferably, the vaporizing agent input into the downstream gasification mechanism is one of water vapor, oxygen, oxygen-enriched air, a mixture of water vapor and oxygen, or a mixture of water vapor and oxygen-enriched air.

[0012] In some embodiments, the connecting auger mechanism and / or the carbon-gas separation box are further provided with a protective gas inlet. At least one protective gas inlet needs to be provided between the front-end gas generating mechanism and the rear-end gas generating mechanism for introducing protective gas. This is to ensure that positive pressure is maintained inside the section between the two gas generating mechanisms, preventing backflow or crossflow of gas between the front-end and rear-end gas generating mechanisms. The protective gas can be selected from gases that are non-flammable and non-explosive, and will not react with carbon under process conditions, such as at least one of water vapor, nitrogen, carbon dioxide, helium, neon, argon, krypton, and xenon. Preferably, the protective gas is water vapor.

[0013] In some embodiments, the front-end gas generating mechanism is further provided with at least one gasifying agent inlet, and a gas distributor is provided at the end of the gasifying agent inlet for inputting and dispersing the gasifying agent to improve reaction efficiency. Preferably, the gasifying agent here is a gas containing oxygen.

[0014] In some embodiments, the front-end gasification mechanism is provided with the screw conveyor structure inside, and the biomass material is squeezed and propelled by the screw conveyor structure in the mechanism and then enters the next connected mechanism.

[0015] In some embodiments, the outer wall of the front gas generating mechanism is provided with a first flue gas inlet.

[0016] In some embodiments, the outer wall of the front gasification mechanism is provided with a jacket, and the outer wall of the jacket is provided with a second flue gas inlet and a flue gas outlet. Hot flue gas can enter the jacket through the second flue gas inlet to indirectly heat the gasification mechanism, and the heated waste flue gas is discharged through the flue gas outlet.

[0017] In some embodiments, the side wall of the outlet opening of the front-end gas generating mechanism is provided with a first sealing groove, the width of which is greater than the inner width of the outlet. The side wall of the inlet opening of the separation box is provided with a second sealing groove, the bottom width of which is greater than the inner width of the inlet. A sealing protrusion is provided at the bottom of the second sealing groove. The inner width of the outlet is less than the inner width of the inlet. A communicating space is formed between the sealing protrusion, the first sealing groove, and the second sealing groove. This communicating space is filled with a sealing liquid, the height of which is lower than the height of the sealing protrusion, allowing a portion of the first sealing groove to be immersed in the sealing liquid. Preferably, the sealing liquid is water. The gas generating mechanism heats up during operation and cools down after operation stops. This may cause thermal expansion and contraction of the gas generating mechanism, and the gas generating mechanism and its outlet may expand and contract. The above technical solution can form a horizontally movable sealed connection between the two connected structures, thereby preventing the thermal expansion and contraction of the gas generating mechanism from damaging the connection between the gas generating mechanism and the equipment connected to the gas generating mechanism, and increasing the safety, stability and reliability of this utility model.

[0018] In some embodiments, the downstream gasification mechanism is equipped with the screw conveyor structure inside, and the biomass material is squeezed and propelled by the screw conveyor structure in the mechanism and then enters the next connected mechanism.

[0019] In some embodiments, the outer wall of the downstream gasification mechanism is provided with a jacket, and the outer wall of the jacket is provided with a second flue gas inlet and a flue gas outlet. Hot flue gas can enter the jacket through the second flue gas inlet to indirectly heat the gasification mechanism, and the heated waste flue gas is discharged through the flue gas outlet.

[0020] In some embodiments, the side wall of the outlet opening of the downstream gasification mechanism is provided with a first sealing groove, the width of which is greater than the inner width of the outlet. The side wall of the inlet opening of the auger mechanism of the discharge auger mechanism is provided with a second sealing groove, the bottom width of which is greater than the inner width of the inlet. A sealing protrusion is provided at the bottom of the second sealing groove. The inner width of the outlet of the gasification mechanism is less than the inner width of the inlet. A communicating space is formed between the sealing protrusion, the first sealing groove, and the second sealing groove. This communicating space is filled with sealing liquid, the height of which is lower than the height of the sealing protrusion, allowing a portion of the first sealing groove to be immersed in the sealing liquid. This arrangement serves the same purpose as the connection between the upstream gasification mechanism and the carbon-gas separation box.

[0021] In some embodiments, the downstream gasification unit has an internal tubular structure consisting of at least two pipes. A top space is formed between the gasification unit's inlet and the upper opening of the tubular structure, and a bottom space is formed between the gasification unit's outlet and the lower opening of the tubular structure. The combustible gas outlet is located on the outer wall of the downstream gasification unit and communicates with the top space. The gasifying agent inlet is located on the outer wall of the downstream gasification unit and communicates with the bottom space. A jacket is provided outside the tubular structure. The outer wall of the jacket is provided with a second flue gas inlet and a flue gas outlet. Hot flue gas can enter the jacket through the second flue gas inlet to indirectly heat the gasification unit, and the heated waste flue gas is discharged through the flue gas outlet.

[0022] In this invention, the flue gas can be high-temperature flue gas generated by the combustion of combustible gas produced by the first-stage gasification mechanism, or flue gas generated by direct gasification and combustion of biomass, or hot flue gas generated by direct combustion of biomass, or hot flue gas generated by combustion of other fuels. It is only required that it is a high-temperature gas flow. In this invention, selecting high-temperature flue gas generated by the combustion of combustible gas produced by the front-end gasification mechanism as a heat source is a preferred option.

[0023] In this invention, the gasification mechanism has various characteristics, which can be categorized based on their features. For example, based on external morphology, it can be classified into vertical and horizontal gasification mechanisms. Specifically, the horizontal gasification mechanism has a horizontally placed cavity, meaning it appears relatively "short and stout" during normal use; the vertical gasification mechanism has a vertically placed cavity, meaning it appears relatively "tall and slender" during normal use. It should be noted that "horizontally placed cavity" and "vertically placed cavity" do not necessarily mean absolutely horizontal; slight tilting downwards or upwards is permissible, provided the tilt angle is such that the biomass material will not automatically slide or roll downwards within the cavity. Similarly, "vertically placed" does not necessarily mean absolutely vertical; slight tilting is permissible, provided the tilt angle is such that the biomass material will not automatically slide or roll downwards within the cavity. As described above, the gasification mechanism may or may not include the auger structure, depending on actual needs. The gasification mechanism may also have a first flue gas inlet or not. With a first flue gas inlet, the gasification mechanism can choose whether to introduce hot flue gas into the gasification mechanism as needed. The gasification mechanism may also have a jacket and a second flue gas inlet and outlet located on the jacket. With a jacket, hot flue gas can enter the jacket through the second flue gas inlet to indirectly heat the material inside the gasification mechanism. To overcome the potential thermal expansion and contraction of the gasification mechanism, preferably, a horizontally movable sealed connection is used between the gasification mechanism outlet of the front-end gasification mechanism and the feed inlet of the connected separation box, and between the rear-end gasification mechanism and the feed inlet of the connected discharge auger mechanism. The above technical features are present in both the front-end and rear-end gasification mechanisms. However, for the rear-end gasification mechanism, there is also a preferred solution: a vertically placed cavity with an external jacket and an internal tubular structure. The above technical features can be combined according to actual needs, and then selected and combined separately according to the actual needs of the front-end gasification mechanism and the back-end gasification mechanism to form multiple embodiments of the biomass two-stage gasification mechanism of this utility model.

[0024] The beneficial effects of this utility model are: By adding a carbon-gas separator between the front-end and rear-end gas generating mechanisms and adding a protective gas inlet to the connecting auger mechanism to input protective gas, positive pressure is maintained in the connecting auger mechanism, preventing potential gas backflow risks, improving the quality of gas produced by the rear-end gas generating mechanism and the safety of this utility model. By setting sealing grooves, sealing protrusions and their liquid seal structure, the connection and sealing performance between the gas generating mechanism and other mechanisms are enhanced, reducing the impact of thermal expansion and contraction during the operation of the gas generating mechanism on the normal operation of this utility model, preventing damage to the connection parts of the mechanism, and making this utility model more stable and reliable. In some embodiments of the present invention, by setting a tube-type structure in the jacket of the downstream gasification mechanism, the heat transfer area is increased, which promotes the material reaction in the downstream gasification mechanism; at the same time, the radial thickness of the carbon layer in each tube is small, which helps to shorten the heat transfer path of the internal carbon layer. The combination of these two factors improves the heating efficiency of the carbon in the downstream gasification mechanism, thereby improving the working efficiency of the present invention. Attached Figure Description

[0025] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of some embodiments of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the auger mechanism of this utility model, which adopts an axle auger structure. Figure 3 This is a schematic diagram of the shaftless auger structure of the auger mechanism of this utility model; Figure 4 This is a schematic diagram of the structure of a vertical gas generation mechanism according to some embodiments of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of a vertical gas generation mechanism according to some embodiments of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the vertical gas generation mechanism in some embodiments of the present invention. Figure 3 ; Figure 7 This is a schematic diagram of the horizontal gas generation mechanism in some embodiments of the present invention. Figure 1 ; Figure 8 This is a partial cross-sectional view of the connection between the front-end gasification mechanism and the carbon-gas separation box in some embodiments of this utility model. Figure 9 This is a partial cross-sectional view of the connection between the rear gas generation mechanism and the discharge auger mechanism in some embodiments of this utility model. Figure 10 This is a schematic diagram of the horizontal gas generation mechanism in some embodiments of the present invention. Figure 2 ; Figure 11 This is a schematic diagram of the horizontal gas generation mechanism in some embodiments of the present invention. Figure 3 ; Figure 12 This is a schematic diagram of the structure of a tubular vertical gas generation mechanism according to some embodiments of the present invention; Figure 13 This is a schematic diagram of the overall structure of some embodiments of the present utility model. Figure 2 ; Figure 14 This is a schematic diagram of the overall structure of some embodiments of the present utility model. Figure 3 .

[0026] In the diagram: 101, front-end gasification mechanism; 102, rear-end gasification mechanism; 111, gasification mechanism inlet; 112, gasification mechanism outlet; 113, combustible gas outlet; 114, gasifying agent inlet; 115, auger structure; 116, first flue gas inlet; 117, second flue gas inlet; 118, flue gas outlet; 119, jacket; 201, feeding auger mechanism; 211, auger mechanism inlet; 212, auger mechanism outlet; 202, connecting auger mechanism; 203, discharging auger mechanism; 204, ash collection mechanism; 300, carbon-gas separation box; 301, separation box inlet; 302, separation box combustible gas outlet; 303, separation box outlet; 401, first sealing groove; 402, second sealing groove; 403, sealing protrusion; 404, sealing liquid; 500, protective gas inlet. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0028] Please see Figure 1 A two-stage biomass gasification mechanism includes a front-end gasification mechanism 101, a charcoal-gas separation box 300, at least one connecting auger mechanism 202, a rear-end gasification mechanism 102, at least one discharge auger mechanism 203, and an ash collection mechanism 204. The gasification mechanism has a gasification inlet 111 at the top, a gasification outlet 112 at the bottom, and a combustible gas outlet 113 on at least one side. The charcoal-gas separation box 300 has a separation box inlet 301, a separation box outlet 303, and a separation box combustible gas outlet 302. The auger mechanism has an auger mechanism inlet 211 and an auger mechanism outlet 212 on its outer wall, and an auger structure 115 inside. The auger structure 115 can be a shafted auger or a shaftless auger. Figure 2 The auger structure 115 in the auger mechanism shown is a shafted auger, such as... Figure 3The diagram shows a shaftless auger. Biomass material enters the auger mechanism's inlet 211 and is propelled by the auger structure 115 within the auger mechanism, then passes through the auger mechanism's outlet 212 into the next connected mechanism. The outlet 112 of the front-end gasification mechanism 101 is connected to the separation box inlet 301. The separation box outlet 303 is connected to the auger mechanism inlet 211 of the connecting auger mechanism 202. The outlet 212 of the connecting auger mechanism 202 is connected to the gasification mechanism inlet 111 of the rear-end gasification mechanism 102. The outlet 112 of the rear-end gasification mechanism 102 is connected to the auger mechanism inlet 211 of the discharge auger mechanism 203. The outlet 212 of the discharge auger mechanism 203 is connected to the ash collection mechanism 204.

[0029] As a preferred embodiment of this utility model, such as Figure 1 As shown, at least one feeding auger mechanism 201 is also provided above the gas-generating inlet 111 of the front gas-generating mechanism 101; the structure of the feeding auger mechanism 201 is the same as that of the auger mechanism; the gas-generating inlet 111 of the front gas-generating mechanism 101 is connected to the auger mechanism outlet 212 of the feeding auger mechanism 201.

[0030] When necessary, the number of feeding auger mechanisms 201 is at least two, wherein the auger mechanism outlet 212 and auger mechanism inlet 211 of the plurality of feeding auger mechanisms 201 are alternately connected; and / or, the number of connecting auger mechanisms 202 is at least two, wherein the auger mechanism outlet 212 and auger mechanism inlet 211 of the plurality of connecting auger mechanisms 202 are alternately connected; and / or, the number of discharging auger mechanisms 203 is at least two, wherein the auger mechanism outlet 212 and auger mechanism inlet 211 of the plurality of discharging auger mechanisms 203 are alternately connected.

[0031] As a preferred embodiment of this utility model, such as Figures 4-7 , Figures 10-12 As shown, the downstream gasification mechanism 102 is also provided with at least one gasifying agent inlet 114, and a gas distributor (not shown in the figure) is provided at the end of the gasifying agent inlet 114 to input and disperse the gasifying agent to improve the reaction efficiency.

[0032] As a preferred embodiment of this utility model, such as Figure 1 , Figure 13 , Figure 14 As shown, the connecting auger mechanism 202 and / or the carbon gas separation box 300 are also provided with a protective gas inlet 500.

[0033] The general process of this utility model is as follows: biomass is fed into the front-end gasification unit 101 through the feeding auger mechanism 201 and becomes char and gas. The char and gas fall into the char-gas separation box 300, where char and gas are separated. The char is then fed into the rear-end gasification unit 102 through the auger and becomes combustible gas and ash (or char-containing ash). The ash falls into the discharge auger mechanism 203 and is transported out to the ash collection mechanism 204.

[0034] In this utility model, the gas generating mechanism has various different types of features. Based on these features, the gas generating mechanism can be classified into several categories. For example, based on its external shape, it can be classified into vertical gas generating mechanisms and horizontal gas generating mechanisms. Specifically, the horizontal gas generating mechanism has a horizontally placed cavity, such as... Figure 7 , Figure 10 , Figure 11 As shown, its appearance during normal use is rather "short and stout"; the vertical gas generating mechanism has a vertically placed cavity, such as... Figures 4-6 , Figure 12 As shown, its appearance during normal use is relatively "tall and slender". It should be noted that "horizontally placed chamber" and "vertically placed chamber" do not necessarily mean absolutely horizontal; slight tilting downwards or upwards is permissible, provided the tilt angle is such that the biomass material will not automatically slide or roll downwards within the chamber. Similarly, "vertically placed" does not necessarily mean absolutely vertical; slight tilting is permissible, provided the tilt angle is such that the biomass material will not automatically slide or roll downwards within the chamber.

[0035] The gas-generating mechanism may or may not include the auger structure 115, depending on actual needs. The gas-generating mechanism may also include a first flue gas inlet 116 or not. With the first flue gas inlet 116, the gas-generating mechanism can choose whether to introduce hot flue gas into the mechanism as needed. The gas-generating mechanism may also include a jacket 119 and a second flue gas inlet 117 and a flue gas outlet 118 located on the jacket 119. With the jacket 119, hot flue gas can enter the jacket 119 through the second flue gas inlet 117 to indirectly heat the gas-generating mechanism. To overcome the potential thermal expansion and contraction of the gas-generating mechanism, preferably, the gas-generating mechanism outlet 112 of the front-end gas-generating mechanism 101 and the separation box inlet 301 connected thereto, and the auger mechanism inlet 211 of the rear-end gas-generating mechanism 102 and the discharge auger mechanism 203 connected thereto, are connected by a horizontally movable sealed connection. The aforementioned technical features are present in both the front-end gasification mechanism 101 and the rear-end gasification mechanism 102. However, for the rear-end gasification mechanism 102, there is a preferred embodiment: a vertically placed cavity with an external jacket 119 and an internal tubular structure. These various technical features can be combined according to actual needs to form multiple embodiments of the gasification mechanism. Furthermore, by selecting and combining these features according to the actual needs of the front-end gasification mechanism 101 and the rear-end gasification mechanism 102, multiple embodiments of the biomass two-stage gasification mechanism of this utility model can be formed.

[0036] [Gas generation mechanism according to a specific embodiment of this utility model] Example 1 Please see Figure 4 A vertical gasification mechanism is described, with a cylindrical upper part and a funnel-shaped lower part. It can be used in a front-end gasification mechanism 101 and / or a rear-end gasification mechanism 102. In this embodiment, the vertical gasification mechanism has a gasification inlet 111 at the center of the top and a gasification outlet 112 at the center of the bottom. A combustible gas outlet 113 is located on one side of the upper part, and three gasifying agent inlets 114 are located on the other side of the upper part. Preferably, a gas distributor (not shown in the figure) is provided at the end of each gasifying agent inlet 114 to input and disperse the gasifying agent, improving reaction efficiency. Optionally, the gasifying agent inlets 114 are positioned as close as possible to the outlet. A first flue gas inlet 116 is located on one side of the lower part. When this embodiment is used as the front-end gasification mechanism 101, hot flue gas can be introduced into the gasification mechanism through the first flue gas inlet 116 to directly heat the material and promote the reaction. Please refer to [link to previous document]. Figure 1 , Figure 4When this embodiment is used as the downstream gas generation mechanism 102, the hot flue gas is generally not introduced because the composition of the hot flue gas is relatively complex. Therefore, the first flue gas inlet 116 can be closed or the first flue gas inlet 116 can be omitted. In this case, the heating effect is generally achieved by introducing a hot gasifying agent or by generating heat when the oxygen contained in the gasifying agent reacts with the carbon.

[0037] Since this embodiment is a vertical gasification mechanism, in most cases the input biomass or char is easily affected by gravity and falls to the bottom. Subsequently, this biomass or char is discharged through an auger mechanism connected to the outlet 112 of the gasification mechanism. Therefore, preferably, this embodiment does not include an auger structure 115 by default. However, in certain special cases (e.g., when inputting certain viscous materials), users can consider adding an auger structure 115 to this embodiment and select either a shafted or shaftless auger as needed. Figure 5 The embodiment shown is equipped with a shaftless auger as the auger structure 115, which is suitable for inputting viscous biomass. Since the outlet 112 of the gasification mechanism in this embodiment is located on the central axis, the position of the central axis will not change when the vertical gasification mechanism expands and contracts with heat. Therefore, the outlet 112 of the gasification mechanism in this embodiment does not need to use the horizontally movable sealing connection.

[0038] Example 2 Please see Figure 6 A vertical gasification mechanism is provided, which can be used in the front gasification mechanism 101 and / or the rear gasification mechanism 102. It is basically the same as that in Embodiment 1, except that the vertical gasification mechanism in this embodiment is further provided with a jacket 119 on its outer wall. The jacket 119 is provided with a second flue gas inlet 117 for introducing hot flue gas into the jacket 119 and a flue gas outlet 118 for discharging waste flue gas. After the hot flue gas is introduced, the jacket 119 can indirectly heat the material in the gasification mechanism.

[0039] Example 3 Please see Figure 7A horizontal gasification mechanism can be used in a front gasification mechanism 101 and / or a rear gasification mechanism 102. It has a gasification mechanism inlet 111 on the top of one side and a gasification mechanism outlet 112 on the bottom of the other side. It also has a combustible gas outlet 113 on one side. Since it has a horizontally placed cavity, the transport of materials in the gasification mechanism is mainly lateral movement. Preferably, the horizontal gasification mechanism is provided with an auger structure 115. A shafted auger or a shaftless auger can be selected according to actual needs. Other structures that can realize horizontal material movement can also be selected according to actual needs. The horizontal gasification mechanism has three gasifying agent inlets 114 on one side of its bottom. Preferably, a gas distributor (not shown in the figure) is provided at the end of each gasifying agent inlet 114 to input and disperse the gasifying agent and improve reaction efficiency. In this embodiment, the horizontal gasification mechanism also has a first flue gas inlet 116 on its outer wall. When this embodiment is used as the front-end gasification mechanism 101, hot flue gas can be introduced into the gasification mechanism through the first flue gas inlet 116 to directly heat the material and promote the reaction. Please refer to [link to previous text]. Figure 7 , Figure 13 Similar to Example 1, when this example is used as the downstream gas generation mechanism 102, since the composition of hot flue gas is relatively complex, hot flue gas is generally not introduced. Therefore, the first flue gas inlet 116 can be closed or the first flue gas inlet 116 can be omitted.

[0040] Please see Figure 8 For horizontal gasification mechanisms, the thermal expansion and contraction caused by temperature changes during operation have a greater impact on the outlet 112 of the gasification mechanism than on vertical ones. Therefore, a first sealing groove 401 is provided on the side wall of the outlet 112 of the gasification mechanism. The width of the first sealing groove 401 is greater than the inner width of the outlet 112 of the gasification mechanism. Correspondingly, when using this embodiment as the front-end gasification mechanism 101, a second sealing groove 402 is provided on the side wall of the inlet 301 of the separation box. The bottom of the second sealing groove 402... The width is greater than the inner width of the separation box inlet 301. A sealing protrusion 403 is provided at the bottom of the second sealing groove 402. The inner width of the gas generating mechanism outlet 112 is less than the inner width of the separation box inlet 301. A communicating space is formed between the sealing protrusion 403, the first sealing groove 401, and the second sealing groove 402. A sealing liquid 404 is contained within this communicating space. The height of the sealing liquid 404 is lower than the height of the sealing protrusion 403, causing a portion of the first sealing groove 401 to be immersed in the sealing liquid 404. (See also...) Figure 9 When this embodiment is used as the downstream gas generation mechanism 102, the auger mechanism inlet 211 of the discharge auger mechanism 203 should also be provided with a second sealing groove 402, and the bottom width of the second sealing groove 402 is greater than the inner width of the auger mechanism inlet 211 of the discharge auger mechanism 203.

[0041] Example 4 Please see Figure 10 A horizontal gasification mechanism is provided, which can be used in the front gasification mechanism 101 and / or the rear gasification mechanism 102. This embodiment is basically the same as embodiment 3, except that the horizontal gasification mechanism in this embodiment is further provided with a jacket 119 on its outer wall. The jacket 119 is provided with a second flue gas inlet 117 for introducing hot flue gas into the jacket 119 and a flue gas outlet 118 for discharging waste flue gas. After the hot flue gas is introduced, the jacket 119 can indirectly heat the material in the gasification mechanism.

[0042] Example 5 Please see Figure 11 A horizontal gasification mechanism can be used in the front gasification mechanism 101 and / or the rear gasification mechanism 102. The difference between this embodiment and embodiment 4 is that the horizontal gasification mechanism in this embodiment no longer has a first flue gas inlet 116 on its outer wall. That is to say, in this embodiment, only the jacket 119 indirectly heats the material in the gasification mechanism, and the hot flue gas will not enter the gasification mechanism.

[0043] Example 6 Please see Figure 12 A vertical gasification mechanism, which can only be used in the downstream gasification mechanism 102, wherein the downstream gasification mechanism 102 has a tubular structure consisting of at least two pipes inside. The gasification mechanism inlet 111 and the upper opening of the tubular structure form a connected top space, and the gasification mechanism outlet 112 and the lower opening of the tubular structure form a connected bottom space. The combustible gas outlet 113 is located on the outer wall of the downstream gasification mechanism 102 and is connected to the top space. The gasifying agent inlet 114 is located on the outer wall of the downstream gasification mechanism 102 and is connected to the bottom space. Preferably, a gas distributor (not shown in the figure) is provided at the end of the gasifying agent inlet 114 to input and disperse the gasifying agent to improve the reaction efficiency. The tubular structure is provided with a jacket 119, and the outer wall of the jacket 119 is provided with a second flue gas inlet 117 and a flue gas outlet 118.

[0044] In this embodiment, during operation, the gas generated in each tube of the tubular structure reaches the top through that tube and collects in the top space. Similarly, the carbon is naturally distributed from the top space to each tube, and finally, the ash is discharged from the bottom of the tubes and collects in the bottom space, and is discharged through the discharge auger mechanism 203. By setting the tubular structure in the jacket 119 of the downstream gasification mechanism 102, the heat transfer area is increased, promoting the material reaction in the downstream gasification mechanism 102; at the same time, the radial thickness of the carbon layer in each tube is small, which helps to shorten the heat transfer path of the internal carbon layer. The combination of these two factors improves the heating efficiency of the carbon in the downstream gasification mechanism 102.

[0045] [A two-stage biomass gasification mechanism according to a specific embodiment of this utility model] Example 7 Please see Figure 1 In this embodiment, both the front-end gas generating mechanism 101 and the rear-end gas generating mechanism 102 adopt Embodiment 1, and neither of the two gas generating mechanisms in Embodiment 1 is equipped with an auger structure 115. The protective gas inlet 500 is located on one side of the carbon gas separation box 300, and the selected protective gas is water vapor. Since the rear-end gas generating mechanism 102 generally does not introduce hot flue gas, the Embodiment 1 used in the rear-end gas generating mechanism 102 does not have a first flue gas inlet 116.

[0046] Example 8 Please see Figure 13 In this embodiment, the front-end gas generating mechanism 101 is selected from Embodiment 1, which does not have an internal auger structure 115; the rear-end gas generating mechanism 102 is selected from Embodiment 3, where the protective gas inlet 500 is located on one side of the auger mechanism 202, and there is only one auger mechanism 202. The selected protective gas is water vapor. Since the rear-end gas generating mechanism 102 generally does not introduce hot flue gas, the Embodiment 3 used for the rear-end gas generating mechanism 102 does not have a first flue gas inlet 116.

[0047] Example 9 Please see Figure 14 In this embodiment, the front-end gas generating mechanism 101 is selected from embodiment 1, and its internal screw conveyor structure 115 is not provided; the rear-end gas generating mechanism 102 is selected from embodiment 6, and the protective gas inlet 500 is located on one side of the carbon gas separation box 300, and the selected protective gas is water vapor.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0050] In the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0051] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

Claims

1. A two-stage biomass gasification mechanism, characterized in that: It includes a front-end gasification mechanism (101), a carbon-gas separation box (300), at least one connecting auger mechanism (202), a rear-end gasification mechanism (102), at least one discharge auger mechanism (203), and an ash collection mechanism (204). The gas generating mechanism is provided with a gas generating mechanism inlet (111), a gas generating mechanism outlet (112), and a combustible gas outlet (113). The carbon gas separator (300) is provided with a separator inlet (301), a separator outlet (303), and a separator combustible gas outlet (302). The outer wall of the auger mechanism is provided with an auger mechanism inlet (211) and an auger mechanism outlet (212), and the interior is provided with an auger structure (115), which is a shafted auger or a shaftless auger; after the biomass material enters the auger mechanism inlet (211), it is pushed by the auger structure (115) in the auger mechanism and then enters the next connected mechanism through the auger mechanism outlet (212); The gas generating mechanism (101) of the front gas generating mechanism (101) is connected to the gas generating mechanism outlet (112) below the separation box inlet (301). The discharge port (303) of the separation box is connected to the feed port (211) of the auger mechanism of the connecting auger mechanism (202); The auger mechanism outlet (212) of the auger mechanism (202) is connected to the gas generation mechanism inlet (111) of the rear gas generation mechanism (102) below. The gas production mechanism outlet (112) of the rear gas production mechanism (102) is connected to the auger mechanism inlet (211) of the discharge auger mechanism (203) below. The ash collection mechanism (204) is connected below the auger outlet (212) of the auger mechanism (203).

2. The biomass two-stage gasification mechanism according to claim 1, characterized in that: At least one feeding auger mechanism (201) is also provided above the gas-generating inlet (111) of the front gas-generating mechanism (101); the structure of the feeding auger mechanism (201) is the same as that of the auger mechanism; the gas-generating inlet (111) of the front gas-generating mechanism (101) is connected to the auger mechanism outlet (212) of the feeding auger mechanism (201).

3. The biomass two-stage gasification mechanism according to claim 2, characterized in that: The number of the feeding auger mechanisms (201) is at least two, wherein the auger mechanism outlet (212) and auger mechanism inlet (211) of the plurality of feeding auger mechanisms (201) are alternately connected; and / or, The number of the connecting auger mechanisms (202) is at least two, wherein the auger mechanism outlet (212) and auger mechanism inlet (211) of the multiple connecting auger mechanisms (202) are alternately connected; and / or, The number of discharge auger mechanisms (203) is at least two, wherein the auger mechanism discharge port (212) and auger mechanism feed port (211) of the plurality of discharge auger mechanisms (203) are alternately connected.

4. The biomass two-stage gasification mechanism according to claim 3, characterized in that: The downstream gasification mechanism (102) is also provided with at least one gasifying agent inlet (114), and a gas distributor is provided at the end of the gasifying agent inlet (114) for inputting and dispersing the gasifying agent to improve reaction efficiency.

5. The biomass two-stage gasification mechanism according to claim 4, characterized in that: The connecting auger mechanism (202) and / or the carbon gas separator (300) are also provided with a protective gas inlet (500).

6. The biomass two-stage gasification mechanism according to claim 5, characterized in that: The front-end gasification mechanism (101) is further provided with at least one gasifying agent inlet (114), and a gas distributor is provided at the end of the gasifying agent inlet (114) for inputting and dispersing the gasifying agent to improve reaction efficiency; and / or, Its interior is provided with the aforementioned auger structure (115); and / or, Its outer wall is provided with a first flue gas inlet (116); and / or, Its outer wall is provided with a jacket (119), and the outer wall of the jacket (119) is provided with a second flue gas inlet (117) and a flue gas outlet (118); and / or, The gas generating mechanism has a first sealing groove (401) on the side wall of the outlet (112) opening. The width of the first sealing groove (401) is greater than the inner width of the outlet (112) of the gas generating mechanism. The separation box inlet (301) has a second sealing groove (402) on the side wall of the opening. The bottom width of the second sealing groove (402) is greater than the inner width of the separation box inlet (301). The bottom of the second sealing groove (402) has a sealing protrusion (403). The inner width of the outlet (112) of the gas generating mechanism is less than the inner width of the separation box inlet (301). The sealing protrusion (403), the first sealing groove (401) and the second sealing groove (402) form a communicating space. The communicating space is filled with sealing liquid (404). The height of the sealing liquid (404) is lower than the height of the sealing protrusion (403) and a part of the first sealing groove (401) is immersed in the sealing liquid (404).

7. The biomass two-stage gasification mechanism according to claim 6, characterized in that: The rear gas production mechanism (102) is internally provided with the auger structure (115); and / or, Its outer wall is provided with a jacket (119), and the outer wall of the jacket (119) is provided with a second flue gas inlet (117) and a flue gas outlet (118); and / or, The gas generating mechanism has a first sealing groove (401) on the side wall of the outlet (112) opening. The width of the first sealing groove (401) is greater than the inner width of the outlet (112) of the gas generating mechanism. The auger mechanism inlet (211) of the discharge auger mechanism (203) has a second sealing groove (402) on the side wall of the opening. The bottom width of the second sealing groove (402) is greater than the inner width of the auger mechanism inlet (211). The bottom of the second sealing groove (402) has a sealing protrusion (403). The inner width of the outlet (112) of the gas generating mechanism is less than the inner width of the auger mechanism inlet (211). The sealing protrusion (403), the first sealing groove (401) and the second sealing groove (402) form a communicating space. The communicating space is filled with sealing liquid (404). The height of the sealing liquid (404) is lower than the height of the sealing protrusion (403) and a part of the first sealing groove (401) is immersed in the sealing liquid (404).

8. The biomass two-stage gasification mechanism according to claim 6, characterized in that: The downstream gasification mechanism (102) has a tubular structure consisting of at least two pipes inside. The gasification mechanism inlet (111) and the upper opening of the tubular structure form a connected top space, and the gasification mechanism outlet (112) and the lower opening of the tubular structure form a connected bottom space. The combustible gas outlet (113) is located on the outer wall of the downstream gasification mechanism (102) and is connected to the top space. The gasifying agent inlet (114) is located on the outer wall of the downstream gasification mechanism (102) and is connected to the bottom space. The tubular structure is provided with a jacket (119), and the outer wall of the jacket (119) is provided with a second flue gas inlet (117) and a flue gas outlet (118).

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