A partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system

Abstract

This invention discloses a dual-furnace coupled organic solid waste pyrolysis gasification system with zoned air intake, comprising a first pyrolysis gasification furnace and a second pyrolysis gasification furnace with identical structures. Both the first and second pyrolysis gasification furnaces include a furnace body and an inner liner disposed within the furnace body. The inner liner is divided into a combustion zone and a pyrolysis zone arranged vertically. The combustion zone and the pyrolysis zone are respectively equipped with a first air intake structure and a second air intake structure. The top and bottom of the furnace body are respectively provided with a flue gas outlet and a return air outlet, both communicating with the interior of the inner liner. The flue gas outlet of the first pyrolysis gasification furnace is connected to the return air outlet of the second pyrolysis gasification furnace via a pipe, and the flue gas outlet of the second pyrolysis gasification furnace is connected to the return air outlet of the first pyrolysis gasification furnace via a pipe. Using the organic solid waste pyrolysis gasification system of this application effectively improves the pyrolysis gasification efficiency and effect.

Description

Technical Field

[0001] This invention belongs to the field of organic solid waste treatment technology, specifically relating to a zoned air intake dual-furnace coupled organic solid waste pyrolysis gasification system. Background Technology

[0002] For small- to medium-sized organic solid wastes, such as household organic solid waste, traditional treatment methods include incineration. However, the flue gas composition after incineration is very complex, with high tar content and high concentrations of toxic and harmful gases, especially dioxins, which seriously affect the surrounding environmental quality and place a heavy burden on downstream exhaust gas treatment. To meet emission standards, significant investment in exhaust gas treatment is required, resulting in high investment and operating costs. Compared to incineration, pyrolysis gasification is a comprehensive technology that decomposes high-molecular-weight organic matter into small-molecule, high-quality energy fuels in an oxygen-deficient atmosphere under certain temperature conditions, achieving energy utilization. It effectively converts the organic matter in materials into a usable form, with lower secondary pollution emissions and higher energy utilization efficiency. Pyrolysis gasification produces combustible gases such as CO and H2, which are then used for high-temperature combustion to treat tar and decompose harmful gases such as dioxins, thereby reducing the need for exhaust gas treatment processes and lowering investment and operating costs.

[0003] In recent years, pyrolysis gasification technology in the solid waste treatment process has made great progress. However, it is limited by drawbacks such as the high moisture content of organic solid waste during pyrolysis and insufficient oxygen concentration during combustible combustion, which affect the efficiency and effect of pyrolysis gasification. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a zoned air intake dual-furnace coupled organic solid waste pyrolysis gasification system, so as to improve the efficiency and effect of organic solid waste pyrolysis gasification.

[0005] The present invention solves the above problems through the following technical means:

[0006] A dual-furnace coupled organic solid waste pyrolysis gasification system with zoned air intake includes a first pyrolysis gasifier and a second pyrolysis gasifier with identical structures. Both the first and second pyrolysis gasifiers include a furnace body and an inner liner disposed inside the furnace body. The inner liner is divided into a combustion zone and a pyrolysis zone arranged vertically. The combustion zone and the pyrolysis zone are respectively equipped with a first air intake structure and a second air intake structure. The top and bottom of the furnace body are respectively provided with a flue gas outlet and a return air outlet that communicate with the interior of the inner liner. The flue gas outlet of the first pyrolysis gasifier is connected to the return air outlet of the second pyrolysis gasifier through a pipe, and the flue gas outlet of the second pyrolysis gasifier is connected to the return air outlet of the first pyrolysis gasifier through a pipe.

[0007] Furthermore, the exhaust port is connected to an exhaust branch pipe, and the exhaust branch pipes of the two pyrolysis gasification furnaces are connected to the exhaust main pipe and the return air main pipe through a four-way junction. The return air main pipe is connected to the return air ports of the two pyrolysis gasification furnaces through two return air branch pipes respectively. The exhaust branch pipes of the first pyrolysis gasification furnace and the exhaust branch pipes of the second pyrolysis gasification furnace are respectively equipped with a first valve and a second valve. The return air branch pipes of the first pyrolysis gasification furnace and the return air branch pipes of the second pyrolysis gasification furnace are respectively equipped with a third valve and a fourth valve.

[0008] Furthermore, the first air intake structure includes a first blower and a first air duct surrounding and covering the outside of the combustion zone. The air outlet of the first blower is connected to the first air duct. The side wall of the combustion zone is uniformly provided with a plurality of first air guides for connecting the first air duct and the combustion zone.

[0009] Furthermore, the second air inlet structure includes a second blower and a second air duct surrounding and covering the outside of the pyrolysis zone. The air outlet of the second blower is connected to the second air duct. The sidewall of the pyrolysis zone is uniformly provided with a plurality of second air guides for connecting the second air duct and the pyrolysis zone.

[0010] Furthermore, the pyrolysis zone is equipped with a grate.

[0011] Furthermore, the furnace body is equipped with a biomass burner.

[0012] Furthermore, the biomass burner is provided with a biomass inlet.

[0013] Furthermore, the furnace body is equipped with a feed inlet and an ignition port.

[0014] The beneficial effects of this invention are:

[0015] This application provides a dual-furnace coupled organic solid waste pyrolysis gasification system with zoned air intake, including a first pyrolysis gasification furnace and a second pyrolysis gasification furnace with identical structures. Both the first and second pyrolysis gasification furnaces include a furnace body and an inner liner disposed inside the furnace body. The inner liner is divided into a combustion zone and a pyrolysis zone arranged vertically. The combustion zone and the pyrolysis zone are respectively equipped with a first air intake structure and a second air intake structure. The top and bottom of the furnace body are respectively provided with a flue gas outlet and a return air outlet that are both connected to the interior of the inner liner. The flue gas outlet of the first pyrolysis gasification furnace is connected to the return air outlet of the second pyrolysis gasification furnace through a pipe, and the flue gas outlet of the second pyrolysis gasification furnace is connected to the return air outlet of the first pyrolysis gasification furnace through a pipe. The organic solid waste pyrolysis gasification system of this application operates in two ways: firstly, two pyrolysis gasifiers work alternately in a cycle, and the reflux flue gas is used to dry the pyrolysis organic solid waste; secondly, the pyrolysis gasifiers are divided into zones for air intake. The first air intake structure blows in an oxygen-rich flow to ensure the oxygen concentration in the combustion zone, while the second air intake structure blows in an oxygen-deficient flow to ensure an oxygen-deficient environment for pyrolysis. Therefore, the pyrolysis gasification efficiency and effect are effectively improved.

[0016] In addition, the advantages of the present invention are reflected in the following aspects:

[0017] 1. Make full use of the temperature in the combustion zone to radiate heat to the organic solid waste in the pyrolysis zone, thereby achieving high-temperature pyrolysis and improving the pyrolysis efficiency of the organic solid waste in the pyrolysis zone.

[0018] 2. The pyrolysis zone and the combustion zone are separated in the same furnace without partitions. Different airflows are blown into the two zones separately, achieving a perfect combination of oxygen-deficient and oxygen-enriched conditions in the same furnace, which is conducive to improving pyrolysis efficiency and efficient utilization of combustible gas thermal energy.

[0019] 3. Under stable pyrolysis and normal gas production of combustible gas, the combustion zone can achieve self-sustaining combustion without the addition of external combustion means, reducing the need for fuel igniters and lowering operating costs;

[0020] 4. The dual-furnace coupled system design fully utilizes high-temperature flue gas to thoroughly dry and heat the organic solid waste in the unused furnaces, reducing the moisture content of the organic solid waste and significantly improving pyrolysis efficiency while producing less tar. The dual-furnace design effectively utilizes the high temperature of the flue gas to preheat the organic solid waste; at 150℃, the gasification rate of organic solid waste can reach 90%, which is 30% higher than traditional gasification devices. Compared with traditional incineration devices, tar is reduced by 80%, and dioxin content is reduced by 95%.

[0021] 5. The exhaust gas purification system is simple and meets emission standards;

[0022] 6. The air inlet pipes of the pyrolysis zone and combustion zone are heat-transferred through high-temperature resistant alloy metal. The air is preheated before entering the pyrolysis zone, which improves the pyrolysis gasification efficiency by more than 30%. The pyrolysis gas combustion zone ensures complete combustion with a combustion temperature of 1000℃.

[0023] 7. The furnace body adopts a double-layer structure design. The inner liner is made of high-temperature resistant alloy, which can withstand temperatures above 1100℃ and has good heat transfer performance, allowing for sufficient preheating of the supplementary air. The cold air entering from the outside can cool down the locally hot areas of the inner wall, thereby preventing localized high-temperature deformation of the inner furnace material. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a front view of the pyrolysis gasification furnace according to a preferred embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of a pyrolysis gasification furnace according to a preferred embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the dual-furnace coupling according to a preferred embodiment of the present invention;

[0028] Figure 4 The effect of preheating temperature on gasification efficiency of organic solid waste;

[0029] Figure 5 The effect of moisture content of organic solid waste on gasification efficiency;

[0030] Figure 6 A comparison of the harmful gas production of the pyrolysis gasification system of this application with that of a conventional incinerator;

[0031] Figure 7 This paper compares the harmful gas production of the pyrolysis gasification system of this application with that of a traditional gasifier. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] like Figures 1 to 3 As shown, the partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system of this embodiment includes a first pyrolysis gasification furnace 14 and a second pyrolysis gasification furnace 15 with identical structures. Both the first and second pyrolysis gasification furnaces include a furnace body 21 and an inner liner 20 disposed inside the furnace body. The furnace body is equipped with a feed inlet 1, an ignition port 9 and a biomass burner 11. The biomass burner is provided with a biomass feed inlet 10. The inner liner is divided into a combustion zone 7 and a pyrolysis zone arranged vertically. The pyrolysis zone is provided with a grate 2.

[0036] The combustion zone and the pyrolysis zone are respectively equipped with a first air inlet structure and a second air inlet structure. Specifically, the first air inlet structure includes a first blower 4 and a first air duct 8 surrounding and covering the outside of the combustion zone. The air outlet of the first blower is connected to the first air duct. The side wall of the combustion zone is uniformly provided with a plurality of first air guides 5 for connecting the first air duct and the combustion zone. The second air inlet structure includes a second blower 3 and a second air duct 12 surrounding and covering the outside of the pyrolysis zone. The air outlet of the second blower is connected to the second air duct. The side wall of the pyrolysis zone is uniformly provided with a plurality of second air guides 6 for connecting the second air duct and the pyrolysis zone.

[0037] The top and bottom of the furnace body are respectively provided with a flue gas outlet 13 and a return air outlet 22, both of which are connected to the interior of the inner liner. The flue gas outlet of the first pyrolysis gasification furnace is connected to the return air outlet of the second pyrolysis gasification furnace through a pipe, and the flue gas outlet of the second pyrolysis gasification furnace is connected to the return air outlet of the first pyrolysis gasification furnace through a pipe. Specifically, the flue gas outlet is connected to a flue gas branch pipe, and the flue gas branch pipes of the two pyrolysis gasification furnaces are connected to a main flue gas pipe and a main return air pipe through a four-way junction. The main return air pipe is connected to the return air outlets of the two pyrolysis gasification furnaces through two return air branch pipes respectively. A first valve 16 and a second valve 17 are respectively provided on the flue gas branch pipes of the first and second pyrolysis gasification furnaces, and a third valve 18 and a fourth valve 19 are respectively provided on the return air branch pipes of the first and second pyrolysis gasification furnaces.

[0038] When a single furnace is operating, organic solid waste enters the pyrolysis zone through the feed inlet and is piled on the grate. The organic solid waste is ignited at the ignition point. A second blower blows oxygen-deficient air into the pyrolysis zone through a second air duct. The organic solid waste undergoes high-temperature pyrolysis in the pyrolysis zone, reaching temperatures of 600℃-800℃. When the pyrolysis temperature drops below 600℃ or during initial ignition, the biomass burner is activated to supplement the pyrolysis zone temperature and improve pyrolysis gasification efficiency. The combustible gas produced in the pyrolysis zone enters the combustion zone. A first blower blows oxygen-enriched air into the combustion zone through a first air duct. Under high-temperature, high-oxygen conditions, the combustible gas undergoes high-temperature combustion and decomposition, further decomposing tar into combustible gas and fully decomposing dioxins. The combustion zone temperature can reach 850℃. When it drops below 850℃, the biomass burner is activated to increase the combustion zone temperature. The high temperature generated by the combustion of the combustible gas can reach 1000℃, which can completely decompose tar and dioxins. The heat from the combustion radiates to the pyrolysis zone, achieving high-temperature pyrolysis. The high-temperature flue gas generated in the combustion zone is discharged through the exhaust port.

[0039] When the two furnaces are coupled and operate alternately, closing the second and third valves allows some of the high-temperature flue gas generated by the first pyrolysis gasification furnace to flow back into the second pyrolysis gasification furnace, where the flue gas is used to dry the organic solid waste inside the second pyrolysis gasification furnace. Similarly, closing the first and fourth valves allows some of the high-temperature flue gas generated by the second pyrolysis gasification furnace to flow back into the first pyrolysis gasification furnace, where the flue gas is used to dry the organic solid waste inside the first pyrolysis gasification furnace.

[0040] Reference Figures 4 to 7 It can be seen that the organic solid waste pyrolysis gasification system of this application adopts two pyrolysis gasification furnaces to work alternately in a cycle, and uses the reflux flue gas to dry the organic solid waste, thereby increasing the temperature during the pyrolysis of organic solid waste and reducing the moisture content during the pyrolysis of organic solid waste; thus, it effectively improves the efficiency and effect of pyrolysis gasification.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A zoned air-inlet dual-furnace coupled organic solid waste pyrolysis gasification system, characterized in that: The system includes a first pyrolysis gasification furnace and a second pyrolysis gasification furnace with identical structures. Both furnaces include a furnace body and an inner liner inside the furnace body. The inner liner is divided into a combustion zone and a pyrolysis zone arranged vertically. The combustion zone and the pyrolysis zone are equipped with a first air inlet structure and a second air inlet structure, respectively. The top and bottom of the furnace body are respectively provided with a flue gas outlet and a return air outlet that communicate with the interior of the inner liner. The flue gas outlet of the first pyrolysis gasification furnace is connected to the return air outlet of the second pyrolysis gasification furnace through a pipe, and the flue gas outlet of the second pyrolysis gasification furnace is connected to the return air outlet of the first pyrolysis gasification furnace through a pipe. The exhaust port is connected to an exhaust branch pipe. The exhaust branch pipes of the two pyrolysis gasification furnaces are connected to the exhaust main pipe and the return air main pipe through a four-way junction. The return air main pipe is connected to the return air ports of the two pyrolysis gasification furnaces through two return air branch pipes respectively. The exhaust branch pipes of the first pyrolysis gasification furnace and the exhaust branch pipes of the second pyrolysis gasification furnace are respectively equipped with a first valve and a second valve. The return air branch pipes of the first pyrolysis gasification furnace and the return air branch pipes of the second pyrolysis gasification furnace are respectively equipped with a third valve and a fourth valve.

2. The partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system according to claim 1, characterized in that: The first air intake structure includes a first blower and a first air duct surrounding and covering the outside of the combustion zone. The air outlet of the first blower is connected to the first air duct. The side wall of the combustion zone is uniformly provided with a plurality of first air guides for connecting the first air duct and the combustion zone.

3. The partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system according to claim 2, characterized in that: The second air inlet structure includes a second blower and a second air duct surrounding and covering the outside of the pyrolysis zone. The air outlet of the second blower is connected to the second air duct. The side wall of the pyrolysis zone is uniformly provided with a plurality of second air guides for connecting the second air duct and the pyrolysis zone.

4. The partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system according to claim 3, characterized in that: The pyrolysis zone is equipped with a grate.

5. The partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system according to claim 4, characterized in that: The furnace body is equipped with a biomass burner.

6. The partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system according to claim 5, characterized in that: The biomass burner is equipped with a biomass inlet.

7. The partitioned air intake dual-furnace coupled organic solid waste pyrolysis gasification system according to claim 6, characterized in that: The furnace body is equipped with a feed inlet and an ignition port.

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