A domestic waste gasification gas coupled coal powder mixed combustion simulation test bench device

Abstract

The application provides a household garbage gasification and gas-pulverized coal mixed combustion simulation test bench device, which comprises a coupling combustion unit, a household garbage gasification unit, a pulverized coal supply unit and a flue gas discharge unit; the coupling combustion unit is used for coupling and mixed combustion of combustible gas and pulverized coal; the household garbage gasification unit is used for gasifying household garbage into combustible gas and supplying the purified combustible gas to the coupling combustion unit; the pulverized coal supply unit is used for supplying pulverized coal to the coupling combustion unit; and the flue gas discharge unit is used for discharging tail gas generated by combustion of the coupling combustion unit. The test bench device can simulate the household garbage gasification process and the household garbage gasification and gas-pulverized coal mixed combustion process, help reveal the combustion stability, pollutant generation characteristics and heat efficiency optimization in the mixed combustion process, and provide theoretical support and engineering verification platform for flexible peak regulation modification of a household garbage gasification and coal-fired unit boiler.

Description

Technical Field

[0001] This application relates to municipal solid waste treatment technology and the field of low-load stable combustion of coal-fired power units. Specifically, it relates to a simulation test bench device for municipal solid waste gasification and gasification coupled with pulverized coal co-combustion. Background Technology

[0002] Traditional methods of municipal solid waste disposal (such as landfill and incineration) face bottlenecks such as secondary pollution and low energy efficiency.

[0003] Thermochemical gasification technology for municipal solid waste can convert organic components into a lower calorific value of approximately 4 MJ / m³. 3 Combustible gases are introduced into coal-fired boilers and coupled with pulverized coal for combustion, which can reduce fossil fuel consumption, realize the resource utilization of waste, and achieve stable combustion of pulverized coal at low load.

[0004] However, the mixed combustion process of municipal solid waste gasification fuel gas and pulverized coal involves a complex multiphase reaction mechanism. Its combustion stability, pollutant generation characteristics and thermal efficiency optimization have not yet been fully revealed. There is an urgent need to develop a dedicated simulation test bench to support subsequent technology research and development and engineering verification. Utility Model Content

[0005] This application provides at least one simulation test bench device for co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal. This test bench device can simulate the co-combustion process of municipal solid waste gasification fuel gas coupled with pulverized coal, revealing issues such as combustion stability, pollutant generation characteristics, and thermal efficiency optimization during the co-combustion process. It provides theoretical support and engineering verification platform for the flexible peak-shaving retrofit of municipal solid waste gasification coupled with coal-fired power units.

[0006] This application provides a simulated test bench device for gasification of municipal solid waste coupled with pulverized coal combustion, including: a coupled combustion unit, a municipal solid waste gasification unit, a pulverized coal supply unit, and a flue gas emission unit; The coupled combustion unit is used for coupled co-combustion of combustible gas and pulverized coal; The municipal solid waste gasification unit is used to gasify municipal solid waste into combustible gas and supply purified combustible gas to the coupled combustion unit; The pulverized coal supply unit is used to supply pulverized coal to the coupled combustion unit; The flue gas emission unit is used to discharge the exhaust gas generated by the combustion of the coupled combustion unit.

[0007] In one optional embodiment, the coupled combustion unit includes a combustion furnace; The combustion furnace has a first combustion chamber and a second combustion chamber, which are connected to each other. The first combustion chamber is used for the coupled combustion of combustible gas and pulverized coal, and the second combustion chamber is used for the combustion of combustible gas.

[0008] In one optional embodiment, the coupled combustion unit further includes an air injection unit; The air supply unit is connected to the first combustion chamber and is used to supply air to the first combustion chamber.

[0009] In one alternative embodiment, the coupled combustion unit further includes a heat exchanger; The heat exchanger is connected to the first combustion chamber and is used to preheat the primary and secondary air by the flue gas in the combustion furnace.

[0010] In one optional embodiment, the coupled combustion unit further includes a temperature regulating valve; The temperature regulating valve is installed in the outlet flue of the combustion furnace. The temperature regulating valve regulates the tail flue gas temperature of the combustion furnace by adjusting the flow rate of cold air drawn into the flue.

[0011] In one optional embodiment, the municipal solid waste gasification unit includes a waste conveyor, a gasifying agent conveyor, a waste gasification furnace, a first gas passage, and a second gas passage. The waste conveyor is used to feed domestic waste into the waste gasification furnace; The gasifying agent conveyor is used to feed the gasifying agent into the waste gasification furnace; The waste gasification furnace is used to gasify domestic waste into combustible gas; The first gas passage is used to deliver a portion of the combustible gas to the first combustion chamber; The second gas passage is used to deliver the remaining combustible gas to the second combustion chamber.

[0012] In one optional embodiment, the waste gasification furnace includes a drying zone, a pyrolysis zone, an oxidation zone, and a reduction zone, in which domestic waste undergoes drying, pyrolysis, oxidation, and reduction sequentially to produce combustible gas.

[0013] In one optional embodiment, the municipal solid waste gasification unit further includes a dechlorination tower; The dechlorination tower is installed in the first gas path and is used to dechlorinate the combustible gas passing through the first gas path.

[0014] In one optional embodiment, the pulverized coal supply unit includes a pulverized coal silo and a pulverized coal feeder; The coal powder silo is used to store coal powder; The pulverized coal feeder is used to transport pulverized coal to the coupled combustion unit.

[0015] In one alternative embodiment, the flue gas emission unit includes a dust removal device, an induced draft fan, and a chimney; The dust removal device is connected to the coupled combustion unit and is used to remove dust from the tail flue gas of the coupled combustion unit. The induced draft fan is connected to the dust removal device, and the induced draft fan is used to discharge the dust-removed tail gas into the chimney; The chimney is connected to the induced draft fan and is used to discharge the dust-removed tail gas into the atmosphere.

[0016] The above-mentioned technical solution of this application has the following beneficial technical effects: The municipal solid waste gasification gasification coupled with pulverized coal co-combustion simulation test bench device of this application embodiment can simulate the municipal solid waste gasification process and the municipal solid waste gasification gasification coupled with pulverized coal co-combustion process. By monitoring the municipal solid waste gasification process and the municipal solid waste gasification gasification coupled with pulverized coal co-combustion process, it can reveal issues such as combustion stability, pollutant generation characteristics and thermal efficiency optimization in the co-combustion process, and provide theoretical support and engineering verification platform for the flexible peak-shaving retrofit of municipal solid waste gasification coupled with coal-fired power unit boilers.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This illustration shows a schematic diagram of a simulated test bench device for gasification of municipal solid waste coupled with pulverized coal combustion, provided in an embodiment of this application. In the picture: 1. Combustion furnace; 2. Gasifier; 3. Heat exchanger; 4. Waste conveyor; 5. Gasifying agent conveyor; 6. Waste gasification furnace; 7. First blower; 8. Second blower; 9. Dechlorination tower; 10. Third blower; 11. Pulverized coal feeder; 12. Dust removal device; 13. Exhaust fan; 14. Chimney. Detailed Implementation

[0020] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0021] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] refer to Figure 1This application provides a simulated test bench device for co-combustion of municipal solid waste gasification gas and pulverized coal, comprising: a coupled combustion unit, a municipal solid waste gasification unit, a pulverized coal supply unit, and a flue gas emission unit. The coupled combustion unit is used for the coupled combustion of combustible gas and pulverized coal. The municipal solid waste gasification unit is used to gasify municipal solid waste into combustible gas and supply purified combustible gas to the coupled combustion unit. The pulverized coal supply unit is used to supply pulverized coal to the coupled combustion unit. The flue gas emission unit is used to discharge the exhaust gas generated by the combustion of the coupled combustion unit.

[0026] During use, this test bench device can simulate the gasification process of municipal solid waste and the co-combustion process of municipal solid waste gasification fuel coupled with pulverized coal. By monitoring the municipal solid waste gasification process and the co-combustion process of municipal solid waste gasification fuel coupled with pulverized coal, it can reveal issues such as combustion stability, pollutant generation characteristics and thermal efficiency optimization during the co-combustion process, providing theoretical support and engineering verification platform for the flexible peak-shaving retrofit of municipal solid waste gasification coupled with coal-fired power units.

[0027] Optionally, in this embodiment, the coupled combustion unit includes a combustion furnace 1. The combustion furnace 1 has a first combustion chamber and a second combustion chamber, which are connected. The first combustion chamber is used for the coupled co-combustion of combustible gas and pulverized coal, and the second combustion chamber is used for the combustion of the combustible gas. In a specific configuration, the combustion furnace 1 is composed of an upper vertical furnace and a lower horizontal furnace, forming an L-shape. The upper vertical furnace houses the first combustion chamber, and the lower horizontal furnace houses the second combustion chamber. Water-cooled pipes are laid inside the combustion furnace 1, and a corresponding cooling system is provided to achieve precise adjustment and control, simulating normal boiler operation. Additionally, the combustion furnace 1 can also be equipped with systems for temperature, pressure, differential pressure measurement, and sampling. In practical use, the first combustion chamber is used for the coupled co-combustion of combustible gas and pulverized coal at the required flow rate. This utilizes the high volatility and flammability of the combustible gas to promote the ignition and stable combustion of the pulverized coal, while also improving combustion conditions, making it easier for the pulverized coal to achieve complete combustion, thereby improving overall combustion efficiency and reducing incomplete combustion products. The second combustion chamber is used to completely combust any unused remaining combustible gases, ensuring that no unburned gases are directly emitted into the atmosphere, thus helping to reduce the emission of harmful gases. The flue gas from the first and second combustion chambers is finally combined and discharged through the flue gas emission unit.

[0028] Optionally, in this embodiment, the coupled combustion unit further includes an air supply unit 2. The air supply unit 2 is connected to the first combustion chamber and is used to supply air to the first combustion chamber. In practical use, by supplying air to the first combustion chamber, the combustible gas and pulverized coal can be fully combusted.

[0029] Optionally, in this embodiment, the coupled combustion unit further includes a heat exchanger 3. The heat exchanger 3 is connected to the first combustion chamber and is used to preheat the primary and secondary air by the flue gas in the combustion furnace 1. Specifically, the heat exchanger 3 is used to release heat from the flue gas to obtain hot air, which is then mixed with pulverized coal and combustible gas to obtain primary (pulverized) air and secondary air. For example, the first combustion chamber is equipped with a four-channel swirl burner, which respectively introduces central air, primary (pulverized) air, inner secondary air, and outer secondary air. The primary air (pulverized) air is a mixture of pulverized coal and hot air, the central air and outer secondary air are mixtures of combustible gas and hot air used to assist in the combustion of pulverized coal, and the inner secondary air is hot air.

[0030] Optionally, in this embodiment, the coupled combustion unit further includes a temperature regulating valve. The temperature regulating valve is located in the outlet flue of the combustion furnace 1, and regulates the flow rate of cold air drawn into the flue to adjust the tail gas temperature of the combustion furnace 1. In practical use, the temperature regulating valve can reduce the flue gas temperature to a set temperature (150°C) to avoid thermal stress damage to subsequent processing equipment (such as dust collectors, desulfurization devices, induced draft fans, etc.) and shorten the service life of these devices.

[0031] Optionally, in this embodiment, the municipal solid waste gasification unit includes a waste conveyor 4, a gasifying agent conveyor 5, a waste gasifier 6, a first gas path, and a second gas path. The waste conveyor 4 is used to feed municipal solid waste into the waste gasifier 6. The gasifying agent conveyor 5 is used to feed gasifying agent into the waste gasifier 6. The waste gasifier 6 is used to gasify municipal solid waste into combustible gas. The first gas path is equipped with a first blower 7, which is used to deliver the required flow rate of combustible gas to the first combustion chamber. The second gas path is equipped with a second blower 8, which is used to deliver the remaining combustible gas to the second combustion chamber. In a specific configuration, the waste gasifier 6 is a downdraft gasifier, including a drying zone, a pyrolysis zone, an oxidation zone, and a reduction zone, which are sequentially divided from top to bottom. In specific use, the waste gasifier 6 is used to process municipal solid waste through drying, pyrolysis, oxidation, and reduction to produce combustible gas. Specifically, municipal solid waste first enters the drying zone (100-200℃) at the top of the waste gasifier 6. Through contact with high-temperature gases, moisture is removed, forming a dry material. As the material moves downwards to the pyrolysis zone (300-600℃), in an oxygen-deficient environment, the organic matter undergoes pyrolysis and decomposition, with long-chain molecules breaking down into volatile gases (such as CO2, CH4, CO, H2), liquid tar, and solid coke. The dried and pyrolyzed mixture continues to move downwards to the high-temperature oxidation zone (700-1200℃). A gasifying agent (such as air) is fed into the furnace via a gasifying agent conveyor 5. The coke undergoes a violent exothermic reaction with oxygen (C + O2 → CO2), releasing heat to maintain the system's high temperature, while some of the tar is oxidized and decomposed. In the subsequent reduction zone (600-1000℃), the incandescent coke undergoes an endothermic reduction reaction with CO2 and H2O (C+CO2→2CO, C+H2O→CO+H2), generating combustible syngas rich in CO and H2. The residual tar is further decomposed into smaller molecule gases. The final syngas is discharged from the bottom, and the ash is removed by the slag removal system. The entire process, by controlling the gasifying agent flow rate, temperature gradient, and material residence time, achieves the efficient conversion of municipal solid waste into combustible gas (4-6 MJ / Nm³).

[0032] Optionally, in this embodiment, the municipal solid waste gasification unit further includes a dechlorination tower 9. The dechlorination tower 9 is located in the first gas path and is used to dechlorinate the combustible gas passing through the first gas path. Specifically, the dechlorination tower 9 is located at the outlet of the first fan 7, and a third fan 10 is also installed at the outlet of the dechlorination tower 9. The third fan 10 is used to draw the dechlorinated combustible gas into the first combustion chamber. In practical use, by removing chlorine from the gas, not only can the equipment be protected from corrosion damage and its service life extended, but the emission of harmful substances can also be significantly reduced, contributing to environmental protection and improving overall energy efficiency.

[0033] Optionally, in this embodiment, the pulverized coal supply unit includes a pulverized coal silo and a pulverized coal feeder 11. The pulverized coal silo is used to store pulverized coal. The pulverized coal feeder 11 is used to transport the pulverized coal to the coupled combustion unit. In a specific configuration, the pulverized coal feeder 11 and the silo are matched to achieve frequency conversion control, with a feed rate adjustment range of 0-100 kg / h and a feed error of less than 1%.

[0034] Optionally, in this embodiment, the flue gas emission unit includes a dust removal device 12, an induced draft fan 13, and a chimney 14. The dust removal device 12 is connected to the coupled combustion unit and is used to remove dust from the tail flue gas of the coupled combustion unit. The chimney 14 is connected to the dust removal device 12 and is used to discharge the dust-removed tail flue gas into the atmosphere. The induced draft fan 13 is located between the dust removal device 12 and the chimney 14 and is used to draw the tail flue gas into the dust removal device 12 and the chimney 14. In specific installations, the dust removal device 12 is equipped with pipelines, valves, an ash collection bin, and a wind cap. In actual use, the tail flue gas of the combustion furnace 1 enters the dust removal device 12 for purification under the traction of the induced draft fan 13, and is finally discharged into the atmosphere through the chimney 14. The flue gas treatment capacity is 13000-20000 m³ / h. 3 / h (temperature 200°C), dust removal efficiency >99%, pressure resistance less than 2000Pa.

[0035] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0036] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A test bench device for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal, characterized in that, include: Coupled combustion unit, municipal solid waste gasification unit, pulverized coal supply unit and flue gas emission unit; The coupled combustion unit is used for coupled co-combustion of combustible gas and pulverized coal; The coupled combustion unit includes a combustion furnace, which has a first combustion chamber and a second combustion chamber. The first combustion chamber and the second combustion chamber are connected. The first combustion chamber is used for coupled co-combustion of combustible gas and pulverized coal, and the second combustion chamber is used for combustion of combustible gas. The municipal solid waste gasification unit is used to gasify municipal solid waste into combustible gas and supply purified combustible gas to the coupled combustion unit; The pulverized coal supply unit is used to supply pulverized coal to the coupled combustion unit; The flue gas emission unit is used to discharge the exhaust gas generated by the combustion of the coupled combustion unit.

2. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 1, characterized in that, The coupled combustion unit also includes an air injection unit; The air supply unit is connected to the first combustion chamber and is used to supply air to the first combustion chamber.

3. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 1, characterized in that, The coupled combustion unit also includes a heat exchanger; The heat exchanger is connected to the first combustion chamber and is used to preheat the primary and secondary air by the flue gas in the combustion furnace.

4. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 1, characterized in that, The coupled combustion unit also includes a temperature regulating valve; The temperature regulating valve is installed in the outlet flue of the combustion furnace. The temperature regulating valve regulates the tail flue gas temperature of the combustion furnace by adjusting the flow rate of cold air drawn into the flue.

5. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 1, characterized in that, The municipal solid waste gasification unit includes a waste conveyor, a gasifying agent conveyor, a waste gasifier, a first gas passage, and a second gas passage; The waste conveyor is used to feed domestic waste into the waste gasification furnace; The gasifying agent conveyor is used to feed the gasifying agent into the waste gasification furnace; The waste gasification furnace is used to gasify domestic waste into combustible gas; The first gas passage is used to deliver a portion of the combustible gas to the first combustion chamber; The second gas passage is used to deliver the remaining combustible gas to the second combustion chamber.

6. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 5, characterized in that, The waste gasification furnace includes a drying zone, a pyrolysis zone, an oxidation zone, and a reduction zone. In the waste gasification furnace, domestic waste undergoes drying, pyrolysis, oxidation, and reduction in sequence to produce combustible gas.

7. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 5, characterized in that, The municipal solid waste gasification unit also includes a dechlorination tower; The dechlorination tower is installed in the first gas path and is used to dechlorinate the combustible gas passing through the first gas path.

8. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 1, characterized in that, The pulverized coal supply unit includes a pulverized coal silo and a pulverized coal feeder; The coal powder silo is used to store coal powder; The pulverized coal feeder is used to transport pulverized coal to the coupled combustion unit.

9. The experimental setup for simulating the co-combustion of municipal solid waste gasification fuel gas coupled with pulverized coal as described in claim 1, characterized in that, The flue gas emission unit includes a dust removal device, an induced draft fan, and a chimney; The dust removal device is connected to the coupled combustion unit and is used to remove dust from the tail flue gas of the coupled combustion unit. The induced draft fan is connected to the dust removal device, and the induced draft fan is used to discharge the dust-removed tail gas into the chimney; The chimney is connected to the induced draft fan and is used to discharge the dust-removed tail gas into the atmosphere.

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