A self-produced gas combustion linkage type pyrolysis gasification device

Abstract

The present invention discloses a self-produced gas combustion linkage pyrolysis gasification device, which includes a pyrolysis furnace. A grate is arranged inside the pyrolysis furnace, and the grate is an active grate. A feed inlet is provided at the pyrolysis furnace above the grate, and a closed feeder is equipped at the feed inlet. A discharge port is provided at the pyrolysis furnace below the grate, and a closed discharger is equipped at the discharge port; it also includes an anaerobic medium-temperature gas source mechanism arranged outside the pyrolysis furnace and supplying flue gas to the pyrolysis furnace. A combustible gas collector is also arranged inside the pyrolysis furnace, and the combustible gas collector is led out to the outside of the pyrolysis furnace through a gas collection pipeline; a return branch pipe is connected in parallel to the gas collection pipeline, and the return branch pipe is connected to the input pipeline of the anaerobic medium-temperature gas source mechanism. The present invention realizes the supply of anaerobic medium-temperature flue gas to the pyrolysis furnace by the combustion of self-produced gas, forms a medium-temperature temperature field inside the pyrolysis furnace, and can effectively control the precipitation temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass pyrolysis, and particularly to a self-produced gas combustion linkage pyrolysis gasification device. Background Art

[0002] Biomass gasification is a process in which, under certain thermodynamic conditions, with the help of air (or oxygen) and steam, the polymers of biomass undergo pyrolysis, oxidation, and reduction reforming reactions, and finally are converted into combustible gases such as carbon monoxide, hydrogen, and low-molecular-weight hydrocarbons.

[0003] The key to biomass gasification lies in the gasifier. Currently, the gasifiers in use include updraft, downdraft, open type, and fluidized bed, etc. The reaction processes of different biomasses also vary. The common gasifier reactions can be divided into an oxidation layer, a reduction layer, a cracking layer, and a drying layer:

[0004] 1). Oxidation layer; The main reaction of biomass in the oxidation layer is the oxidation reaction. The gasifying agent is introduced from the lower part of the grate, absorbs heat through the ash layer, and then enters the oxidation layer, where it undergoes a combustion reaction with high-temperature carbon to generate a large amount of carbon dioxide and release heat at the same time. The temperature can reach 1000 - 1300 degrees Celsius; The combustion in the oxidation layer is all exothermic reactions, and the heat generated by this part of the reaction provides the heat source for the reduction reaction in the reduction layer, the cracking of the material, and the drying.

[0005] 2). Reduction layer; The carbon dioxide and carbon generated in the oxidation layer react with steam in the reduction layer.

[0006] 3). Cracking layer; The hot gas generated in the oxidation layer and the reduction layer passes through the cracking layer during the upward process, heating the biomass and causing the biomass in the cracking area to undergo a cracking reaction.

[0007] 4). Drying layer. The gas products passing through the oxidation layer, the reduction layer, and the cracking layer rise to this area, heating the biomass raw material, evaporating the moisture in the raw material, absorbing heat, and reducing the generated temperature. The outlet temperature of the biomass gasifier is generally 100 - 300 °C.

[0008] The above oxidation layer and reduction layer are collectively called the gasification zone, where the gasification reaction mainly takes place; the cracking layer and the drying layer are collectively called the fuel preparation zone.

[0009] The invention disclosed in the patent publication number CN110484306A discloses a compound biomass staged gasification furnace, which includes a furnace body. A grate is fixed on the lower side wall inside the furnace body. The space below the grate is the slag chamber. A dust discharge port is arranged on the furnace body side wall corresponding to the slag chamber. A filter screen is also fixed on the inner wall of the furnace body. The filter screen is located above the grate and forms a pyrolysis chamber with the grate. A fine filter is fixed on the top wall inside the furnace body. A feeding mechanism is fixed on the outside of the furnace body. An initial filter mechanism is fixed on the feeding mechanism. The initial filter mechanism is connected to the feeding mechanism through a feeding pipe. The initial filter mechanism is connected to the upper part of the side wall of the furnace body and the fine filter mechanism respectively through a gas pipe 1 and a gas pipe 2.

[0010] The invention disclosed in the patent publication number CN110452736A discloses a downdraft carbon-gas co-production gasification furnace. Its main structure from top to bottom is respectively a feed hopper, a storage bin, a gasification reaction chamber, a double-section funnel-shaped water-cooled jacket, a tipping grate, and a sedimentation chamber. A carbon discharge auger is arranged at the bottom of the sedimentation chamber. A funnel-shaped feeding tray is arranged on the inner side of the lower part of the storage bin. A funnel-shaped ash tray is superimposed on the inner side of the upper part of the double-section funnel-shaped water-cooled jacket; Biomass fuel first undergoes a high-temperature cracking gasification reaction in the gasification reaction chamber to generate gas. The gas discharges downward from the gas outlet on the side wall of the sedimentation chamber; The biomass fuel that has not been completely reacted to generate gas in the gasification reaction chamber is carbonized and falls into the sedimentation chamber and cools to form biomass carbon, so that the biomass fuel can achieve carbon-gas co-production at the same time.

[0011] The invention provided in the patent publication number CN107083257B provides a biomass gasification system, including: a gasification furnace, which includes a furnace body and a feeding pipeline. The furnace body includes an air outlet, a grate, and a feeding port. The air outlet is arranged on the side wall of the furnace body. The grate is arranged at the bottom of the furnace body, and an air inlet is arranged thereon. The feeding pipeline is arranged corresponding to the feeding port at the top of the furnace body; The feeding device includes a storage bin, a feeding pipeline, a feeding mechanism, a first sealing door, a second sealing door, and a sealing component. The feeding pipeline is arranged on the top of the storage bin. The first sealing door is arranged on the feeding pipeline. The feeding mechanism is installed at the bottom of the storage bin. The second sealing door is arranged corresponding to the feeding pipeline, and a driving rod is arranged thereon. A sealing cover is arranged on the driving rod. The sealing cover includes an upper end face and a side wall. A small hole is opened on the upper end face; The sealing component includes a water tank arranged on the storage bin. A channel for passing through the driving rod is arranged in the water tank. The channel is tubular, and the sealing cover covers outside the channel.

[0012] The above technical solutions all adopt the conventional gasification furnace layout forms of an oxidation layer, a reduction layer, a cracking layer, and a drying layer. However, it is found in application that since the gasifying agent generally uses oxygen-containing normal-temperature air, which is introduced into the gasification zone from the lower part of the grate, it is difficult to control during the combustion reaction, and the temperature often exceeds the optimal temperature for the evolution of combustible gas from biomass, ultimately affecting the evolution effect of combustible gas; And the gas export of the conventional gasification furnace requires the cooperation of a high-power blower to continuously extract, resulting in large energy consumption. Summary of the Invention

[0013] The object of the present invention is to provide a self-produced gas combustion linkage pyrolysis gasification device.

[0014] To solve the above technical problems, the present invention adopts the following technical solutions:

[0015] A self-produced gas combustion linkage pyrolysis gasification device includes a pyrolysis furnace. A grate is arranged inside the pyrolysis furnace. There is a feed inlet at the pyrolysis furnace above the grate, and a closed feeder is provided at the feed inlet. There is a discharge port at the pyrolysis furnace below the grate, and a closed discharger is provided at the discharge port.

[0016] The grate is an active grate, which includes a plurality of horizontally arranged furnace rollers side by side. The adjacent furnace rollers are grouped in pairs, and the two furnace rollers in the same group rotate towards each other and away from each other alternately.

[0017] It also includes an oxygen-free medium-temperature gas source mechanism arranged outside the pyrolysis furnace and supplying flue gas to the pyrolysis furnace. The oxygen-free medium-temperature gas source mechanism includes a burner. The inlet of the burner is connected with an input pipeline for supplying gas to the burner. The gas burns in the burner to produce flue gas. The outlet of the burner is connected with a flue gas output pipeline, and the flue gas conveying pipeline is introduced into the interior of the pyrolysis furnace.

[0018] A combustible gas collector is also arranged inside the pyrolysis furnace. The combustible gas collector is led out to the outside of the pyrolysis furnace through a gas collection pipeline.

[0019] A return branch pipe is connected in parallel to the gas collection pipeline. The return branch pipe is connected with the input pipeline of the oxygen-free medium-temperature gas source mechanism, and a return control valve is arranged on the return branch pipe.

[0020] A gas calorific value detector is arranged at the end of the gas collection pipeline. The signal output end of the gas calorific value detector is connected with a control module, and the signal output end of the control module is connected with the active grate and the closed feeder.

[0021] A dust collector, a cooler and a conveying fan are sequentially connected to the gas collection pipeline.

[0022] A collection control valve is arranged on the gas collection pipeline downstream of the connection point of the return branch pipe.

[0023] The burner is connected with a blast fan.

[0024] Material stirring teeth are arranged on the surface of the furnace roller along the circumferential direction.

[0025] The closed feeder includes a feed cylinder connected with the feed inlet. The cross-section of the feed cylinder is a rectangular structure. Two horizontally arranged feed rollers are stacked up and down inside the feed cylinder. The feed rollers match and are sealed with the feed cylinder, and axially extending material grooves are arranged on the feed rollers along the circumferential direction.

[0026] The closed feeder is a screw conveyor connected to the discharge port and horizontally arranged.

[0027] A distributor is provided below the feed port inside the pyrolysis furnace.

[0028] The temperature of the flue gas produced by combustion in the burner is 570 - 600 °C.

[0029] The beneficial effects of the present invention are as follows:

[0030] 1. The present invention uses the oxygen-free medium-temperature flue gas with a temperature of about 570 - 600 °C generated by the burner to provide an oxygen-free medium-temperature heat source for the pyrolysis furnace, forming a medium-temperature (570 - 600 °C) temperature field inside the pyrolysis furnace, which can effectively control the precipitation temperature, ensure that the biomass inside the pyrolysis furnace is at the optimal precipitation temperature for precipitating combustible gases, and thus ensure the precipitation effect of combustible gases. Since the temperature field formed inside the pyrolysis furnace is a medium-temperature (570 - 600 °C) temperature field, the temperature for precipitating combustible gases is also relatively low, reducing the difficulty of subsequent cooling treatment.

[0031] Under the suction of the combustible gas collector, the raw material gradually undergoes oxygen-free medium-temperature pyrolysis to release combustible gas volatiles. At the same time, the released gas enters the gas collection pipeline from the combustible gas collector under the suction of the conveying fan and is discharged outside the pyrolysis furnace, and dust removal and cooling treatments are carried out in sequence.

[0032] And because pyrolysis is a pressure-increasing process, the required suction power of the conveying fan is relatively small, reducing energy consumption and improving work efficiency. At the same time, the suction power of the conveying fan is relatively small, and the dust carried out when the released combustible gas is discharged outward is less, reducing the difficulty of subsequent purification treatment.

[0033] At the same time, since the oxygen-free medium-temperature heat source provided for the pyrolysis furnace is used, the carbon in the biomass basically does not participate in the reaction, the calorific value of the released combustible gas is relatively high, and the slag after the release of combustible gas is carbonaceous slag, which falls to the discharge port through the grate and is discharged through the closed feeder for reuse.

[0034] 2. A return branch pipe is connected in parallel to the gas collection pipeline of the present invention. The return branch pipe is connected to the input pipeline of the oxygen-free medium-temperature gas source mechanism, and a return control valve is provided on the return branch pipe. Through this design, part of the combustible gas collected into the gas collection pipeline is transported to the input pipeline for supplying gas to the burner through the return branch pipe, realizing the supply of oxygen-free medium-temperature flue gas from the self-produced gas combustion to the pyrolysis furnace.

[0035] 3. In the present invention, a gas calorific value detector is provided at the end of the gas collection pipeline. The signal output end of the gas calorific value detector is connected to the control module, and the signal output end of the control module is connected to the active grate and the closed feeder. The calorific value of the combustible gas in the gas collection pipeline can be detected by the gas calorific value detector. If the calorific value level drops, the active grate is controlled to discharge the furnace slag to the discharge port, and the closed feeder is controlled to feed new materials.

[0036] 4. The grate in the present invention adopts an active grate, which includes a plurality of horizontally arranged furnace rollers side by side. The adjacent furnace rollers are grouped in pairs, and rotate towards each other and away from each other alternately in time, which can achieve active discharging and ensure the uniformity of discharging.

[0037] 5. In the present invention, a closed feeder is provided at the feed port, and a closed discharger is provided at the discharge port, ensuring the airtight effect in the pyrolysis furnace.

[0038] 6. A cooler is provided on the gas collection pipeline in the present invention. The cooler has multiple stages, and the multi-stage coolers are connected in series on the gas collection pipeline in turn to form a multi-stage cooling mechanism. After being cooled by the cooler, dry combustible gas at about 80 °C is obtained for use. At the same time, during the cooling process, the chemical substances in the combustible gas dissolve in the liquid to form chemical products such as wood vinegar liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of Embodiment 1 of the present invention;

[0040] Figure 2 is a schematic diagram of the closed feeder in Embodiment 1 of the present invention;

[0041] Figure 3 is a schematic diagram of the active grate rotating towards each other in Embodiment 1 of the present invention;

[0042] Figure 4 is a schematic diagram of the active grate rotating away from each other in Embodiment 1 of the present invention;

[0043] Figure 5 is a schematic diagram of Embodiment 2 of the present invention;

[0044] Figure 6 is a schematic diagram of Embodiment 3 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0045] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0046] Embodiment 1:

[0047] As Figure 1As shown in the figure, an anaerobic medium-temperature down-draft pyrolysis device of the present invention includes a pyrolysis furnace 1. A grate 2 is arranged inside the pyrolysis furnace 1. There is a feed inlet at the pyrolysis furnace 1 above the grate 2, and a closed feeder 3 is equipped at the feed inlet. A slag bin 4 is formed at the pyrolysis furnace 1 below the grate 2. The slag bin is provided with a discharge port downward, and a closed discharger 5 is equipped at the discharge port.

[0048] As Figure 2 shown in the figure, in this embodiment, the closed feeder 3 includes a feed cylinder 31 connected to the feed inlet. The cross-section of the feed cylinder 31 is a rectangular structure. Two horizontally arranged feed rollers 32 are tangent to each other up and down inside the feed cylinder 31. The feed rollers 32 are matched with and sealed with the feed cylinder 31. Axially extending material grooves 33 are arranged circumferentially on the feed rollers 31. The feed cylinder 31 is connected upward with a feed hopper 34 to achieve closed feeding. Inside the pyrolysis furnace 1, a distributor 35 is arranged below the feed inlet to achieve uniform distribution of materials.

[0049] In this embodiment, the closed discharger 5 is a screw conveyor connected to the discharge port and horizontally arranged.

[0050] In the present invention, the cooperation of the closed feeder 3 and the closed discharger 4 ensures the airtight effect inside the pyrolysis furnace.

[0051] As Figure 3 and Figure 4 shown in the figure, the grate 2 is an active grate, which includes a plurality of horizontally arranged side-by-side furnace rollers. The surface of the furnace roller 21 is provided with material-dialing teeth 22 arranged circumferentially. The furnace rollers 21 are adjacent to each other in pairs. Two furnace rollers in the same group rotate towards each other and away from each other alternately in time.

[0052] Taking six furnace rollers as an example for illustration, they are divided into three groups and form five discharge gaps. When two furnace rollers rotate towards each other, the discharge gaps of the first, third, and fifth ones discharge materials downward, and the discharge gaps of the second and fourth ones turn over materials upward; when two furnace rollers rotate away from each other, the discharge gaps of the first, third, and fifth ones turn over materials upward, and the discharge gaps of the second and fourth ones discharge materials downward. Alternating in this way, active discharging is achieved, and the uniformity of discharging is ensured.

[0053] The present invention also includes an anaerobic medium-temperature gas source mechanism arranged outside the pyrolysis furnace 1 and supplying flue gas to the pyrolysis furnace 1. The anaerobic medium-temperature gas source mechanism includes a burner 6. The inlet of the burner 6 is connected with an input pipeline 61 for supplying gas to the burner 6. The burner is also connected with a blower 63. The gas burns in the burner 6 to produce anaerobic medium-temperature flue gas (the temperature of the flue gas is 570 - 600 °C, preferably about 600 °C). The outlet of the burner 6 is connected with a flue gas output pipeline 62, and the flue gas conveying pipeline 62 is introduced into the interior of the pyrolysis furnace.

[0054] The pyrolysis furnace 1 is also provided with a combustible gas collector 7. The combustible gas collector 7 is led out to the outside of the pyrolysis furnace 1 through a gas collection pipeline 71. A dust collector 8, a cooler 9 and a delivery fan 10 are sequentially connected to the gas collection pipeline. The evolved combustible gas enters the gas collection pipeline 71 from the combustible gas collector 7 under the suction of the delivery fan 10 and is discharged to the outside of the pyrolysis furnace 1, and is sequentially subjected to dust removal and temperature reduction treatment.

[0055] In this embodiment, the cooler 9 is a shell-and-tube cooler. The cooler 9 has four stages. The four-stage coolers are sequentially connected in series on the gas collection pipeline to form a multi-stage cooling mechanism.

[0056] A return branch pipe 12 is connected in parallel to the gas collection pipeline 71. The return branch pipe 12 is connected to the input pipeline 61 of the anaerobic medium-temperature gas source mechanism. A return control valve 13 is provided on the return branch pipe 12. A collection control valve 14 is provided on the gas collection pipeline 71 downstream of the connection point of the return branch pipe 12. Through this design, a part of the combustible gas collected into the gas collection pipeline 71 is transported through the return branch pipe 12 to the input pipeline 61 for supplying gas to the burner, and the self-produced gas is burned to supply anaerobic medium-temperature flue gas to the pyrolysis furnace.

[0057] And a gas calorific value detector 15 is provided at the end of the gas collection pipeline. The signal output end of the gas calorific value detector 15 is connected to the control module. The signal output end of the control module is connected to the active grate and the sealed feeder 3. The calorific value of the combustible gas in the gas collection pipeline 71 can be detected through the gas calorific value detector 15. If the calorific value level drops, the active grate is controlled to discharge furnace slag to the discharge port, and the sealed feeder 3 is controlled to feed new materials.

[0058] The working principle of the present invention is as follows: Biomass materials (such as garbage, sludge, rubber, etc.) enter the pyrolysis furnace 1 through the sealed feeder 3, and the formed material layer indication line is as Figure 1 shown in 11 in the figure.

[0059] The anaerobic medium-temperature flue gas with a temperature of about 570 - 600 °C generated by the burner 6 provides an anaerobic medium-temperature heat source for the pyrolysis furnace 1, and a medium-temperature (570 - 600 °C) temperature field is formed in the pyrolysis furnace 1, which can effectively control the evolution temperature, ensure that the biomass in the pyrolysis furnace is at the optimal evolution temperature for evolving combustible gas, and further ensure the evolution effect of the combustible gas. Since a medium-temperature (570 - 600 °C) temperature field is formed in the pyrolysis furnace 1, the temperature for evolving combustible gas is also relatively low (about 300 °C), reducing the difficulty of subsequent temperature reduction treatment.

[0060] Under the suction of the combustible gas collector 7, the raw materials are gradually pyrolyzed in an oxygen-free medium temperature to release the volatile components of the combustible gas. At the same time, the released gas enters the gas collection pipeline 71 from the combustible gas collector 7 under the suction of the delivery fan 10 and is discharged outside the pyrolysis furnace 1, and then undergoes dust removal and cooling treatments in sequence. The released gas is cooled by the cooler 9 to obtain dry combustible gas at about 80 °C for use. At the same time, during the cooling process, the chemical substances in the combustible gas dissolve in the liquid to form chemical products such as wood vinegar liquid.

[0061] And since pyrolysis is a pressure-increasing process, the required suction power of the delivery fan 10 is relatively small, which reduces energy consumption and improves work efficiency. At the same time, the suction power of the delivery fan is relatively small, and less dust is carried out when the released combustible gas is discharged outward, reducing the difficulty of subsequent purification treatment.

[0062] And since an oxygen-free medium temperature heat source is provided for the pyrolysis furnace 1, the carbon in the biomass basically does not participate in the reaction, the calorific value of the released combustible gas is relatively high, and the slag after the combustible gas is released is carbon slag. It falls to the discharge port through the grate and is discharged through the sealed discharger 5 for reuse.

[0063] The present invention is completely different from the conventional gasifier layout form and principle, effectively ensuring that the biomass in the pyrolysis furnace is at the optimal pyrolysis temperature for releasing combustible gas, thereby ensuring the release effect of the combustible gas and realizing resource-based comprehensive treatment.

[0064] This embodiment adopts a down-draft structure. The flue gas delivery pipeline 62 is located above the grate 2 adjacent to the top of the pyrolysis furnace 1. Preferably, the end of the flue gas delivery pipeline 62 is located below the top indication line 11 of the material layer in the pyrolysis furnace 1. The combustible gas collector 7 is located below the grate 2.

[0065] Embodiment Two:

[0066] The difference between this embodiment and Embodiment One is that as Figure 5 shown, this embodiment adopts an up-draft structure. The flue gas delivery pipeline 62 is located below the grate 2, and the end of the flue gas delivery pipeline 62 points upward to the grate 2 and is connected with a medium temperature heater 64.

[0067] In this embodiment, the medium temperature heater 64 is a cone structure communicated with the end of the flue gas delivery pipeline. The tip of the cone also points upward to the grate, and the side wall of the cone is provided with exhaust ports to realize the uniform supply of oxygen-free medium temperature flue gas in the pyrolysis furnace 1 and ensure the uniformity of the medium temperature field formed in the pyrolysis furnace 1.

[0068] The combustible gas collector 7 is provided with a combustible gas collection port at the top of the pyrolysis furnace adjacent to the grate. In this embodiment, the combustible gas collection port is located above the top indication line 11 of the material layer in the pyrolysis furnace 1.

[0069] Embodiment Three:

[0070] The difference between this embodiment and the first embodiment is that, as Figure 6 shown, this embodiment adopts a side suction structure. The flue gas conveying pipeline 62 is located below the grate 2, and the end of the flue gas conveying pipeline 62 points upward to the grate 2 and is connected with a medium-temperature heater 64.

[0071] In this embodiment, the medium-temperature heater 64 is a cone structure communicated with the end of the flue gas conveying pipeline. The tip of the cone also points upward to the grate. The side wall of the cone is provided with exhaust ports, so as to realize the uniform supply of oxygen-free medium-temperature flue gas in the pyrolysis furnace 1 and ensure the uniformity of the medium-temperature temperature field formed in the pyrolysis furnace 1.

[0072] The combustible gas collector 7 is provided with a combustible gas collecting mechanism at the side wall above the grate. The combustible gas collecting mechanism includes exhaust ports arranged on the side wall in the middle of the pyrolysis furnace. In this embodiment, the exhaust ports are located above the top indication line 11 of the material layer in the pyrolysis furnace 1. The exhaust ports are arranged around the pyrolysis furnace to form an exhaust belt. A collecting hood 72 that wraps it is arranged around the outside of the exhaust belt. The collecting hood 72 is hermetically fixed to the pyrolysis furnace 1. The collecting hood 72 is filled with granular packing 73. The collecting hood 72 is connected outward with a gas collecting pipeline 71. With the above structure, the combustible gas volatiles decomposed from the raw materials in the pyrolysis furnace 1 are directly sucked away from the exhaust ports on the side wall in the middle of the pyrolysis furnace 1, optimizing the path for the combustible gas to be discharged from the pyrolysis furnace and avoiding the explosion risk caused by the formation of gas pockets in the pyrolysis furnace.

[0073] At the same time, since the collecting hood 72 is filled with granular packing 73, the granular packing 73 is preferably vermiculite, and gaps are formed between the granular packing 73. When the combustible gas enters the granular packing, it travels along the gaps, so that the dust in the combustible gas is absorbed by the granular packing as much as possible.

[0074] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be modified or equivalently replaced, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

[0075] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "upper", "lower", "left", "right", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the protection content of the present invention.

Claims

1. A self-produced gas combustion linkage pyrolysis gasification device, comprising a pyrolysis furnace. A grate is arranged inside the pyrolysis furnace. There is a feed inlet at the pyrolysis furnace above the grate, and a closed feeder is provided at the feed inlet. There is a discharge outlet at the pyrolysis furnace below the grate, and a closed discharger is provided at the discharge outlet. It is characterized in that: The grate is an active grate, which includes a plurality of horizontally arranged furnace rollers side by side. The furnace rollers are adjacent to each other in pairs, and the two furnace rollers in the same group rotate towards each other and away from each other alternately; The surface of the furnace roller is provided with feeding teeth arranged circumferentially. It also includes an oxygen-free medium-temperature gas source mechanism arranged outside the pyrolysis furnace and supplying flue gas to the pyrolysis furnace. The oxygen-free medium-temperature gas source mechanism includes a burner. The inlet of the burner is connected with an input pipeline for supplying gas to the burner. The gas burns in the burner to produce flue gas. The outlet of the burner is connected with a flue gas output pipeline, and the flue gas conveying pipeline is introduced into the interior of the pyrolysis furnace. The temperature of the flue gas produced by combustion in the burner is 570 - 600 °C. A combustible gas collector is also arranged inside the pyrolysis furnace. The combustible gas collector is led out to the outside of the pyrolysis furnace through a gas collection pipeline. A return branch pipe is connected in parallel to the gas collection pipeline. The return branch pipe is connected with the input pipeline of the oxygen-free medium-temperature gas source mechanism, and a return control valve is arranged on the return branch pipe. The gas collection pipeline is provided with a collection control valve downstream of the connection point of the return branch pipe.

2. The self-produced gas combustion linkage pyrolysis gasification device according to claim 1, It is characterized in that: A gas calorific value detector is arranged at the end of the gas collection pipeline. The signal output end of the gas calorific value detector is connected with a control module, and the signal output end of the control module is connected with the active grate and the closed feeder.

3. The self-produced gas combustion linkage pyrolysis gasification device according to claim 1, It is characterized in that: A dust collector, a cooler and a conveying fan are sequentially connected to the gas collection pipeline.

4. The self-produced gas combustion linkage pyrolysis gasification device according to claim 1, It is characterized in that: The burner is connected with a blower fan.

5. The self-produced gas combustion linkage pyrolysis gasification device according to claim 1, It is characterized in that: The closed feeder includes a feed cylinder connected to the feed inlet. The cross-section of the feed cylinder is a rectangular structure. Two horizontally arranged feed rollers are stacked up and down inside the feed cylinder. The feed rollers are matched with the feed cylinder and are in sealing cooperation. Axially extending troughs are arranged on the feed rollers circumferentially.

6. The self-produced gas combustion linkage pyrolysis gasification device according to claim 1, It is characterized in that: The closed discharger is a spiral conveyor connected to the discharge outlet and horizontally arranged.

7. The self-produced gas combustion linkage pyrolysis gasification device according to claim 1, It is characterized in that: A distributor is arranged inside the pyrolysis furnace below the feed inlet.

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