High-temperature solid waste gasification coupling coal-fired boiler direct combustion system

Abstract

The utility model discloses a high-temperature solid waste gasification coupling coal-fired boiler direct combustion system, which belongs to the technical field of solid waste utilization and comprises a micro-positive-pressure circulating fluidized bed gasification furnace, a high-temperature solid waste gasification fuel gas conveying pipeline and a coal-fired boiler. A high-temperature solid waste gasified fuel gas inlet of the coal-fired boiler is connected with a high-temperature solid waste gasified fuel gas outlet of the micro-positive-pressure circulating fluidized bed gasification furnace through a high-temperature solid waste gasified fuel gas conveying pipeline, and the micro-positive-pressure circulating fluidized bed gasification furnace is used for gasifying solid wastes to obtain high-temperature solid waste gasified fuel gas rich in CO, H2 and CH4; the coal-fired boiler is used for blending combustion of high-temperature solid waste gasified fuel gas; according to the device disclosed by the utility model, the high-temperature solid waste gasified fuel gas is directly fed into the coal-fired boiler after being discharged from the micro-positive-pressure circulating fluidized bed gasification furnace without being cooled or only being slightly cooled. According to the utility model, the sensible heat loss of the high-temperature solid waste gasified gas can be reduced, tar condensation generated in the conveying process of the medium-temperature (about 400 DEG C) gasified gas is avoided, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solid waste utilization, and specifically relates to a high-temperature solid waste gasification coupled coal-fired boiler direct combustion system. Background Art

[0002] After solid waste is gasified, the generated gas is sent to the boiler for mixed combustion and power generation, which is an advanced technology for resource utilization of solid waste. Circulating fluidized bed gasifier is a conventional equipment for solid waste gasification. The gasified gas generated by solid waste gasification in a circulating fluidized bed gasifier usually has a temperature between 800-1000℃. At present, in the technical process of domestic solid waste gasification coupled with coal-fired boiler power generation, the high-temperature solid waste gasification gas needs to be cooled by heat transfer oil or heat exchanger before being sent to the coal-fired boiler, and then sent to the boiler for mixed combustion and power generation. The temperature of the cooled gasification gas needs to match the selection of the gasification gas transmission fan and the design of the boiler gasification gas burner. During the cooling process, the high-temperature solid waste gasification gas will not only produce sensible heat loss and reduce energy quality, but also produce tar condensation, leading to corrosion and blockage of the transmission pipeline, and increasing maintenance costs. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a high-temperature solid waste gasification coupled coal-fired boiler direct combustion system, which directly sends the high-temperature solid waste gasification gas from the circulating fluidized bed gasifier into the boiler for co-combustion and power generation without intermediate cooling treatment, or only performs light cooling treatment. The temperature of the high-temperature solid waste gasification gas after the light cooling treatment is higher than 550°C, ensuring that tar in the high-temperature solid waste gasification gas is not precipitated.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a high-temperature solid waste gasification coupled coal-fired boiler direct combustion system, including a micro-positive pressure circulating fluidized bed gasification furnace, a high-temperature solid waste gasification gas transmission pipeline and a coal-fired boiler, and the high-temperature solid waste gasification gas inlet of the coal-fired boiler is connected to the high-temperature solid waste gasification gas outlet of the micro-positive pressure circulating fluidized bed gasification furnace through the high-temperature solid waste gasification gas transmission pipeline.

[0005] Furthermore, a slightly positive pressure circulating fluidized bed gasifier is used to gasify solid waste to obtain high-temperature solid waste gasification fuel gas rich in CO, H2, and CH4; it includes a gasifier furnace, a cyclone separator, and a returner, the cyclone separator is connected to the outlet of the gasifier furnace, the upper end of the returner is connected to the lower end of the cyclone separator, and the outlet of the returner is connected to the gasifier furnace.

[0006] Furthermore, the inlet end of the high-temperature solid waste gasification gas transmission pipeline is connected to the gas outlet at the top of the cyclone separator; the height of the outlet end of the high-temperature solid waste gasification gas transmission pipeline is higher than the height of the coal-fired boiler burner.

[0007] Furthermore, the inlet end of the high-temperature solid waste gasification fuel gas delivery pipeline is connected to the top outlet of the gasifier furnace; the height of the outlet end of the high-temperature solid waste gasification fuel gas delivery pipeline is higher than the height of the coal-fired boiler burner.

[0008] Furthermore, the high-temperature solid waste gasification fuel gas transmission pipeline adopts an anti-wear and heat-insulating structure: from the outside to the inside, it includes a pipeline body, a thermal insulation layer, and a fire-resistant and wear-resistant layer. The pipeline body adopts a steel plate or a membrane wall structure, and there is another insulation layer outside the pipeline body.

[0009] Furthermore, the furnace of the gasifier is provided with a pressure monitoring element and a temperature monitoring element.

[0010] Furthermore, a curved channel is provided at the outlet of the returner to connect to the furnace of the gasifier. The curved channel first extends upward from the returner and then extends obliquely downward to connect to the furnace of the gasifier.

[0011] Furthermore, a slag discharge port is provided at the bottom of the furnace of the gasifier, and the slag discharge time is determined according to the temperature and pressure in the furnace of the gasifier, and the slag discharge port is connected to a slag cooler.

[0012] Furthermore, a solid waste conveying device is arranged in front of the micro-positive pressure circulating fluidized bed gasifier for conveying solid waste raw materials to the furnace of the gasifier; a gasifier input port is arranged at the lower end of the furnace of the gasifier, which is connected to the gasifier conveying device for conveying water vapor and air to the furnace of the gasifier.

[0013] Furthermore, the high-temperature solid waste gasification fuel gas coming out of the gasifier furnace contains a large amount of solid particles. The cyclone separator is used to separate the dust-containing high-temperature solid waste gasification fuel gas into gas and solid. The solid separation outlet is connected to the gasifier furnace through a return feeder.

[0014] Compared with the prior art, the utility model has at least the following beneficial effects: the micro-positive pressure circulating fluidized bed gasifier utilizes the operating principle of the circulating fluidized bed to recycle and reuse hot ash through a circulating return system, and fine-grained solid waste is used as raw material during the gasification process; the particulate matter in the furnace is fluidized under the action of the airflow, similar to the flow of liquid, which helps to fully mix the particulate matter with the gasification agent and make the gasification process more efficient; by adjusting the gas pressure in the gasifier, the combustion conditions can be optimized, so that the waste can be better gasified in the furnace, thereby improving the gasification efficiency and heat release; the device described in the utility model can not only avoid the tar condensation of medium-temperature (about 400°C) gasification fuel gas during transportation, but also reduce the loss of sensible heat of the gasification fuel gas during the cooling process. This arrangement realizes the resource utilization of solid waste and power generation, while also improving the energy efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure, 1. slightly positive pressure circulating fluidized bed gasifier; 2. high-temperature solid waste gasification fuel gas transmission pipeline; 3. coal-fired boiler; 11. gasifier body; 12. cyclone separator; 13. return device. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0020] The high-temperature solid waste gasification gas from the circulating fluidized bed gasifier is directly sent to the boiler for mixed combustion and power generation without intermediate cooling treatment, or only light cooling treatment. The temperature of the high-temperature solid waste gasification gas after light cooling treatment is higher than 550°C, ensuring that the tar in the high-temperature solid waste gasification gas does not precipitate. However, the direct transportation of high-temperature solid waste gasification gas also puts forward higher technical requirements. High-temperature solid waste gasification gas places higher standards on the heat and wear resistance of the transmission pipeline and related equipment, requiring the use of more advanced materials and structural designs; the expansion, support suspension, insulation and reliability problems that may arise in the high-temperature solid waste gasification gas transmission pipeline also need to be properly resolved through technical means.

[0021] The utility model provides a high-temperature solid waste gasification coupled coal-fired boiler direct combustion system, comprising a micro-positive pressure circulating fluidized bed gasifier 1, a high-temperature solid waste gasification fuel gas transmission pipeline 2 and a coal-fired boiler 3, wherein the high-temperature solid waste gasification fuel gas inlet of the coal-fired boiler 3 is connected to the high-temperature solid waste gasification fuel gas outlet of the micro-positive pressure circulating fluidized bed gasifier 1 through the high-temperature solid waste gasification fuel gas transmission pipeline 2.

[0022] Examples, such as Figure 1 As shown, a high-temperature solid waste gasification coupled coal-fired boiler direct combustion system includes a micro-positive pressure circulating fluidized bed gasifier 1, a high-temperature solid waste gasification fuel gas transmission pipeline 2, and a coal-fired boiler 3.

[0023] Among them, the micro-positive pressure circulating fluidized bed gasifier 1 is used to gasify solid waste to obtain high-temperature solid waste gasification gas rich in CO, H2 and CH4. The micro-positive pressure circulating fluidized bed gasifier 1 includes a gasifier furnace 11, a cyclone separator 12 and a returner 13. The gasifier furnace 11 is used to gasify solid waste to obtain preliminary high-temperature gasification gas rich in CO, H2 and CH4. The cyclone separator 12 is connected to the outlet of the gasifier furnace 11. The cyclone separator 12 is used to settle larger particles in the high-temperature solid waste gasification gas to the returner 13 below. The upper end of the returner 13 is connected to the lower end of the cyclone separator 12, and the outlet of the returner 13 is connected to the gasifier furnace 11. The returner 13 is used to return the particles separated from the high-temperature solid waste gasification gas to the gasifier furnace 11.

[0024] The micro-positive pressure circulating fluidized bed gasifier utilizes the operating principle of the circulating fluidized bed to recycle hot ash through a circulating return system. In the gasification process, fine-grained solid waste is used as raw material; the particles in the furnace are fluidized under the action of the airflow, similar to the flow of liquid, which helps to fully mix the particles with the gasification agent and make the gasification process more efficient; by adjusting the gas pressure in the gasifier, the combustion conditions can be optimized, so that the waste can be better gasified in the furnace, thereby improving the gasification efficiency and heat release.

[0025] The gasifier furnace 11 is provided with a pressure monitoring element and a temperature monitoring element. The normal operation of the combustion furnace requires the maintenance of a certain combustion pressure. Too high or too low pressure may cause damage to the equipment in the furnace or an unstable combustion process, affecting production efficiency and safety. The pressure monitoring element can be used to feedback the pressure in real time, which helps to adjust the operating parameters and ensure the safe and efficient operation of the gasifier furnace 11. At the same time, a temperature monitoring element is provided to monitor the temperature and pressure in pairs to provide effective monitoring data.

[0026] The inlet end of the high-temperature solid waste gasification fuel gas delivery pipeline 2 is connected to the slightly positive pressure circulating fluidized bed gasification furnace 1 , and the outlet end is connected to the coal-fired boiler 3 .

[0027] When a cyclone separator 12 and a return material 13 are provided, the inlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is connected to the gas outlet at the top of the cyclone separator 12; the height of the outlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is higher than the height of the burner of the coal-fired boiler 3. The main function of the cyclone separator 12 is to collect and separate solid particles in the gasification gas generated in the furnace of the gasifier. The solid particles may be raw materials that are not completely gasified or solid byproducts generated by the reaction. The cyclone separator separates the gas and solid particles through the rotating airflow inside it. The solid particles are separated and collected under the action of centrifugal force, and the clean gas is discharged from the gas outlet at the top of the cyclone separator. The inlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is connected to the gas outlet at the top of the cyclone separator 12, and the clean gasification gas separated from the cyclone separator directly enters the high-temperature solid waste gasification gas delivery pipeline 2, and the delivery pipeline 2 transports the high-temperature gasification gas processed by the cyclone separator from the gasifier to the coal-fired boiler 3 or other combustion equipment. The outlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is connected to the burner of the coal-fired boiler 3. The height of the outlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is usually designed to be higher than the height of the burner of the coal-fired boiler 3. In order to ensure that the gasification gas can flow smoothly into the burner and burn after mixing with the air inside the burner. The return device 13 is usually connected to the solid particle outlet of the cyclone separator 12, and is used to return the solid particles collected by the cyclone separator to the gasifier furnace for re-gasification. Through the return device 13, the recycling of raw materials in the gasifier furnace can be achieved, the gasification efficiency can be improved and the emission of solid waste can be reduced.

[0028] The high-temperature solid waste gasification gas transmission pipeline 2 adopts an anti-wear and heat-insulating structure: from the outside to the inside, it includes a pipeline body, a heat-insulating layer, and a fire-resistant and wear-resistant layer. The pipeline body adopts a steel plate or a membrane wall structure, and there is another heat-insulating layer outside the pipeline body; the heat-insulating layer is located outside the pipeline body, which plays a role in reducing heat loss and preventing heat transfer. High-efficiency heat-insulating materials such as ceramic fiber and aluminum silicate fiber are usually used. Ceramic fiber and aluminum silicate fiber have excellent heat-insulating properties and high-temperature resistance. The setting of the heat-insulating layer can effectively reduce the temperature of the pipeline surface, reduce heat loss, and improve energy utilization efficiency. The fire-resistant and wear-resistant layer is located inside the heat-insulating layer and directly contacts the high-temperature gas. It is usually made of high-temperature refractory materials and wear-resistant materials, such as refractory bricks and wear-resistant ceramics. Refractory bricks and wear-resistant ceramics can maintain stable performance at high temperatures and have good wear resistance. They can resist the scouring and wear of solid particles in the gas. The setting of the fire-resistant and wear-resistant layer can protect the pipeline body from wear and erosion and extend the service life of the pipeline. The entire pipeline structure is designed and manufactured with attention paid to sealing to ensure that gas does not leak and to ensure a safe working environment. Considering the thermal expansion and contraction that may occur in pipelines at high temperatures, the pipeline structure is designed with a certain degree of elasticity to reduce the impact of temperature changes on the pipeline. In addition, in order to facilitate the maintenance and overhaul of the pipeline, corresponding inspection ports and connectors are usually set up so that the pipeline can be partially repaired and replaced without affecting the overall operation.

[0029] When the cyclone separator 12 and the return device 13 are not set, the inlet end of the high-temperature solid waste gasification gas transmission pipeline 2 is connected to the top outlet of the gasifier furnace 11; the height of the outlet end of the high-temperature solid waste gasification gas transmission pipeline 2 is higher than the height of the burner of the coal-fired boiler 3.

[0030] Its working process is as follows: When the high-temperature solid waste gasification coupled coal-fired boiler direct combustion system starts working, the high-temperature solid waste gasification gas generated in the micro-positive pressure circulating fluidized bed gasifier 1 enters the cyclone separator 12 from the gasifier furnace 11, and the cyclone separator 12 separates the larger particles in the high-temperature solid waste gasification gas and returns it to the gasifier furnace 11 through the return device 13 below. After this preliminary purification, the high-temperature solid waste gasification gas enters the high-temperature solid waste gasification gas transmission pipeline 2 from the cyclone separator 12, and finally enters the coal-fired boiler 3 for combustion. In the entire system, the power for the flow of the high-temperature solid waste gasification gas is the pressure difference between the gasifier furnace 11 and the coal-fired boiler 3.

[0031] Optionally, based on the above embodiments, the micro-positive pressure circulating fluidized bed gasifier described in the present application may not be provided with the cyclone separator 12 and the return feeder 13, and whether or not to provide them is related to the specific composition of the solid waste and the gasification pressure and temperature in the gasifier furnace 11. When the cyclone separator 12 and the return feeder 13 are not provided, the inlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is connected to the top outlet of the gasifier furnace 11; the height of the outlet end of the high-temperature solid waste gasification gas delivery pipeline 2 is higher than the height of the burner of the coal-fired boiler 3.

[0032] Optionally, a curved channel is provided at the outlet of the returner 13 to connect to the furnace 11 of the gasifier. The curved channel first extends upward from the returner 13 and then extends obliquely downward to connect to the furnace 11 of the gasifier.

[0033] According to the process requirements of the gasifier and the characteristics of the raw materials, the ratio of water vapor and air can be adjusted to achieve the best gasification effect. The ratio of the gasifier is adjusted in real time according to the operating status of the gasifier and the type of raw materials. The gasifier conveying device should ensure the stable supply and precise control of the gasifier. The metering pump and flow meter can be used to accurately control the flow of water vapor and air.

[0034] A mixer or static mixer can be installed in the conveying pipeline to ensure the mixing uniformity of the gasifier. For the gasifier conveying device, safety monitoring measures should be set up to ensure the safe operation of the equipment. For possible gas leaks, a gas detection alarm system should be installed to detect and deal with leakage problems in time.

[0035] Embodiment 2, on the basis of embodiment 1, a curved channel is provided at the outlet of the returner 13 to connect with the furnace 11 of the gasifier, and the curved channel first extends upward from the returner 13 and then extends obliquely downward to connect with the furnace 11 of the gasifier; a carefully planned curved channel is designed at the outlet of the returner 13, and the channel is cleverly connected with the furnace 11 of the gasifier. The curved channel first extends upward from the returner 13, then extends obliquely downward, and finally connects smoothly with the furnace 11 of the gasifier, which not only improves the flow characteristics of the material, effectively prevents the direct scouring of the pipeline by high-temperature gas and ash, thereby significantly extending the service life of the pipeline, but also optimizes the distribution of the material in the furnace, and improves the gasification efficiency.

[0036] Ordinary technicians in this field can determine the length and angle of the bending channel according to the actual operating conditions and material characteristics of the gasifier to ensure that the material can enter the furnace of the gasifier smoothly and smoothly, reducing failures caused by poor material flow. This not only improves the operating efficiency of the gasifier, but also reduces maintenance costs, providing a strong guarantee for the safe and efficient operation of the gasifier.

[0037] Optionally, the outer walls of the micro-positive pressure circulating fluidized bed gasifier 1 and the high-temperature solid waste gasification gas transmission pipeline 2 can both adopt a membrane wall structure or a steel plate insulation structure. The membrane wall structure includes a wall composed of steel pipes and steel plates welded at intervals, and a wear-resistant and refractory material covering the inner wall of the wall. The steel pipe extends from bottom to top along the height direction of the equipment, and the cooling medium flows in the steel pipe. The lower end of the steel pipe is the cooling medium inlet, and the upper end of the steel pipe is the cooling medium outlet; the steel plate insulation structure includes a steel plate, and a wear-resistant and refractory material covering the inner wall of the wall.

[0038] The temperature in the furnace of the gasifier has an important influence on the progress of the gasification reaction. Generally, the higher the temperature, the more favorable the gasification reaction. However, too high a temperature may increase the CO2 content in the coal gas, thereby reducing the cold gas efficiency. The determination of the slag discharge time needs to take into account the temperature in the furnace to ensure that the gasification reaction is carried out within the optimal temperature range. The pressure in the furnace of the gasifier also has an impact on the gasification reaction. Although the increase in pressure is not conducive to the progress of the gasification reaction, the pressurized operation can increase the concentration of the reactants, accelerate the reaction rate, and improve the gasification efficiency. The determination of the slag discharge time also needs to take into account the pressure in the furnace to ensure that the gasification reaction is carried out under appropriate pressure. The slag discharge port is connected to the slag cooler to effectively discharge and cool the ash in the furnace. The slag cooler usually has cooling and crushing functions, which can cool the high-temperature ash to a suitable temperature and crush it into small pieces; the connection method of the slag discharge port and the slag cooler may vary depending on the model and scale of the gasifier. The slag discharge port needs to be designed to be large enough so that the ash can be discharged smoothly. At the same time, the processing capacity of the slag cooler must also be considered to ensure that the ash can be cooled and crushed in time.

[0039] A solid waste conveying device is provided in front of the micro-positive pressure circulating fluidized bed gasifier 1, which is used to convey solid waste raw materials to the gasifier furnace 11; a gasifier input port is provided at the lower end of the gasifier furnace 11, which is connected to the gasifier conveying device, and is used to convey water vapor and air to the gasifier furnace 11; it can be designed as an automatic control system to ensure that the solid waste raw materials can be continuously and stably conveyed to the gasifier furnace; the conveying device can be customized according to the properties and particle size of the raw materials to adapt to different types of solid waste. In addition to traditional mechanical conveying and pneumatic conveying, vibration conveying, chain conveying and other methods can also be used to meet the conveying needs in different occasions; during the conveying process, metal detectors, iron removers and other equipment can be set to remove impurities in the raw materials to prevent damage to the gasifier.

[0040] During the transportation process, dust removal equipment, such as bag dust collectors, cyclone dust collectors, etc., can be installed to reduce dust emissions and protect the environment; for solid waste that is prone to produce harmful gases, a gas collection and treatment system can be set up to ensure that emissions meet environmental protection requirements.

[0041] In summary, the utility model provides a high-temperature solid waste gasification coupled coal-fired boiler direct combustion system, which mainly solves the problems of reduced energy quality and tar condensation caused by cooling of high-temperature solid waste gasification gas in the existing solid waste gasification coupled coal-fired boiler technology. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system includes a micro-positive pressure circulating fluidized bed gasifier, a high-temperature solid waste gasification gas transmission pipeline and a coal-fired boiler. A micro-positive pressure circulating fluidized bed gasifier for generating high-temperature solid waste gasification gas is provided upstream of the high-temperature solid waste gasification gas transmission pipeline; a coal-fired boiler is provided downstream of the high-temperature solid waste gasification gas transmission pipeline. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system can reduce the loss of sensible heat of high-temperature solid waste gasification gas during the cooling process, and at the same time avoid tar condensation of medium-temperature (about 400°C) gasification gas during the transportation process, thereby realizing the resource utilization of solid waste and power generation, and improving the energy efficiency of the entire system.

[0042] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A high-temperature solid waste gasification coupled coal-fired boiler direct combustion system, characterized in that: The invention comprises a micro-positive pressure circulating fluidized bed gasifier (1), a high-temperature solid waste gasification gas transmission pipeline (2) and a coal-fired boiler (3), wherein the high-temperature solid waste gasification gas inlet of the coal-fired boiler (3) is connected to the high-temperature solid waste gasification gas outlet of the micro-positive pressure circulating fluidized bed gasifier (1) via the high-temperature solid waste gasification gas transmission pipeline (2).

2. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 1 is characterized in that: The micro-positive pressure circulating fluidized bed gasifier (1) is used for gasifying solid waste; the micro-positive pressure circulating fluidized bed gasifier (1) comprises a gasifier furnace (11), a cyclone separator (12) and a material returner (13); the cyclone separator (12) is connected to the outlet of the gasifier furnace (11); the upper end of the material returner (13) is connected to the lower end of the cyclone separator (12); and the outlet of the material returner (13) is connected to the gasifier furnace (11).

3. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 2 is characterized in that: The inlet end of the high-temperature solid waste gasification gas delivery pipeline (2) is connected to the gas outlet at the top end of the cyclone separator (12); the height of the outlet end of the high-temperature solid waste gasification gas delivery pipeline (2) is higher than the height of the burner of the coal-fired boiler (3).

4. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 2 is characterized in that: The high-temperature solid waste gasification fuel gas transmission pipeline (2) adopts an anti-wear and heat-insulating structure: from the outside to the inside, it is the pipeline body, the heat-insulating layer, and the fire-resistant and wear-resistant layer. The pipeline body adopts a steel plate or a membrane wall structure, and a heat-insulating layer is added outside the pipeline body.

5. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 2 is characterized in that: The gasifier furnace (11) is provided with a pressure monitoring element and a temperature monitoring element.

6. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 2 is characterized in that: A curved channel is arranged at the outlet of the returner (13) to communicate with the furnace (11) of the gasifier. The curved channel first extends upward from the returner (13) and then extends obliquely downward to communicate with the furnace (11) of the gasifier.

7. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 2 is characterized in that: A solid waste conveying device is arranged in front of the micro-positive pressure circulating fluidized bed gasifier (1) for conveying solid waste raw materials to the gasifier furnace (11); a gasifying agent input port is arranged at the lower end of the gasifier furnace (11), and the gasifying agent input port is connected to the gasifying agent conveying device for conveying water vapor and air to the gasifier furnace (11).

8. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 1 is characterized in that: The inlet end of the high-temperature solid waste gasification gas delivery pipeline (2) is connected to the top outlet of the gasifier furnace (11); the height of the outlet end of the high-temperature solid waste gasification gas delivery pipeline (2) is higher than the height of the burner of the coal-fired boiler (3).

9. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 1 is characterized in that: A slag discharge port is arranged at the bottom of the gasifier furnace (11). The slag discharge time is determined according to the temperature and pressure in the gasifier furnace. The slag discharge port is connected to a slag cooler.

10. The high-temperature solid waste gasification coupled coal-fired boiler direct combustion system according to claim 1, characterized in that: The high-temperature solid waste gasification gas coming out of the gasifier furnace (11) contains a large amount of solid particles. The cyclone separator (12) is used to separate the dust-containing high-temperature solid waste gasification gas into gas and solid. The solid separation outlet is connected to the gasifier furnace (11) through the return device (13).

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