Ignition-start-up-process depth coupled dry powder gasification burner

Abstract

The utility model discloses a kind of ignition-starting-process depth coupling's dry powder gasification burner, belong to coal gasification and coal chemical equipment technical field.Gasification burner includes burner body and ignition assembly, burner body is composed of ignition fuel pipe, ignition oxygen pipe, primary cooling pipe and secondary cooling pipe of coaxial round pipe sleeve, by inside to outside form ignition fuel passage, ignition oxygen passage, oxygen / water vapor passage, primary cooling jacket, pulverized coal passage, secondary cooling jacket, the outlet end surface of each passage is progressively retracted arrangement;The top side wall of pulverized coal passage is equipped with multiple inclined pulverized coal feed pipe, spiral winding shape axial extension to passage end, the end of pulverized coal passage, oxygen / water vapor passage is equipped with cyclone.The utility model ignition-starting-process depth coupling, pulverized coal passage, oxygen / water vapor passage can be reused, reduce control node, improve burner operation reliability, improve variable load regulation capability.

Description

Technical Field

[0001] This utility model relates to a dry powder gasification burner with deep coupling of ignition-start-up-process, belonging to the technical field of coal gasification and coal chemical equipment. Background Technology

[0002] Fluidized bed pulverized coal gasification technology has become one of the mainstream routes for clean coal conversion due to its advantages such as wide adaptability to different coal types, high carbon conversion rate, and high cold gas efficiency. As the core component of the fluidized bed gasifier, the burner's function covers the entire process of ignition, start-up heating, stable process operation, and load regulation. Therefore, the structure and configuration of the gasification burner are crucial to the safe, efficient, and long-term stable operation of the gasifier.

[0003] Existing pulverized coal gasifiers, such as Shell, Colin, and two-stage gasifiers, generally adopt a "functionally segmented, independently set" design for their burner systems. This means that ignition, start-up, and process burners are distributed along different heights and angles within the furnace, with each burner equipped with an independent water-cooled jacket. While the Colin burner combines the ignition and start-up burners into one, it still requires three additional process burners, resulting in cramped space at the furnace top and difficulties in disassembly and assembly. Traditional separate gasification burner channels have a single function: the ignition channel carries fuel gas, the start-up channel carries diesel or syngas, and the process channel carries pulverized coal and oxygen. The ignition process must be completed sequentially: ignition burner ignites → start-up burner ignites → process burner feeds → pre-stage burner withdraws. Each stage switching involves the coordination of more than ten parameters, including fuel properties, flow rate, oxygen-fuel ratio, cooling water volume, propulsion mechanism stroke, and valve sealing, resulting in a narrow operating window. Separate gasification burners have clear functions and are easy to maintain, but they also have problems such as single channel function, cumbersome cooling, decentralized control, large structure, long operation chain, and weak variable load capacity.

[0004] GSP furnaces, aerospace furnaces, Shenning furnaces, and Dongfang furnaces employ a "multi-channel parallel" design concept, forming a composite gasification burner that integrates ignition, start-up, and process control, simplifying the burner system and reducing its size. However, existing composite gasification burners use two channels for ignition fuel and start-up fuel, resulting in a large difference in fuel flow between the low-load ignition stage and the start-up heating stage. This leads to significant contradictions in regulating valve selection and makes the switching process prone to flameout and deflagration. Furthermore, the ignition burner is constantly placed in a high-temperature zone, resulting in a short head lifespan. Additionally, the flexible ignition energy under high pressure is insufficient, and if the main burner trips, it still needs to be depressurized to atmospheric pressure for re-ignition, failing to achieve true "hot standby-hot start-up." To withstand temperatures above 1400℃, existing composite gasification burners generally adopt a "multi-layer water-cooled jacket" structure. While the multi-layered cooling jacket can extend the head lifespan, it introduces significant thermal inertia, causing frequent cracking of welds in the head end cap and separator pipe, becoming a primary cause of unplanned maintenance. Utility Model Content

[0005] This utility model aims to provide a composite dry powder gasification burner and its usage method that deeply couples ignition, start-up, and process, allows for channel reuse, integrates cooling, and has a wide range of adjustable load.

[0006] To address the problems existing in the industrial application of current composite dry powder gasification burners, this utility model proposes a new design concept of "deep coupling, channel reuse, and integrated cooling": From a structural design perspective, ignition fuel, ignition oxygen, main oxygen / steam, pulverized coal, and a two-stage water jacket are integrated into a single composite burner using a coaxial five-layer sleeve, forming four coaxial jets from the inside out: ignition fuel - ignition oxygen - main oxygen / steam - pulverized coal; the outlet end faces of each channel are recessed by 5~20mm to form a stepped flame anchor point, enabling the low-load ignition flame to directly ignite the start-up gas, and then use the start-up flame to ignite the pulverized coal step by step; the ignition rod adopts a reusable... The retractable high-voltage arc design allows the gasifier to exit the high-temperature zone after ignition, solving the problem of "long-term ablation." From a process perspective, the gasifier utilizes pulverized coal channels and oxygen / steam channels for the supply of start-up fuel gas and start-up oxygen. The process channels are reusable, eliminating the need to switch burners throughout the process and preventing flameout and deflagration that can occur with traditional composite gasification burners. By reusing the start-up and process channels, the more than ten control nodes of traditional composite burners are reduced to three sets of flow regulation, with a load regulation range of 10-110% and a 30% increase in heating rate. This enables the dry powder gasifier to start up under pressure and rapidly change load, providing core equipment support for the flexibility and large-scale development of modern coal chemical industry.

[0007] This utility model provides a dry powder gasification burner with deep coupling of ignition-start-up-process, including a burner body and an ignition component; The burner body is assembled from coaxial circular tubes, consisting of, from the inside out, an ignition fuel tube, an ignition oxygen tube, a primary cooling tube, and a secondary cooling tube. These tubes are connected by flanges, and the height of their tips decreases sequentially. An annular cavity exists between the inner and outer walls of the primary and secondary cooling tubes, with a vertical baffle in the center to form an internal and external reflux channel for the cooling medium. The coaxial circular tubes are stacked together to form a multi-layered annular / hollow cavity, consisting of, from the inside out, an ignition fuel channel, an ignition oxygen channel, an oxygen / water vapor channel, and a primary cooling tube. The system includes a cooling jacket, a pulverized coal channel, and a secondary cooling jacket. The top sidewalls of the ignition fuel channel, ignition oxygen channel, and oxygen / water vapor channel are respectively equipped with inlet pipes and flange joints. The top sidewalls of the primary and secondary cooling jackets are respectively equipped with circulating cooling water inlets and outlets; the medium enters from the outer layer, circulates, and flows out from the inner layer. The top sidewall of the pulverized coal channel is equipped with multiple pulverized coal feed pipes and flange joints, with each pulverized coal feed pipe evenly arranged along the circumferential direction at the same height. The angle between the pulverized coal feed pipe and the burner axis is 10~45 degrees. oThe coal powder channel is equipped with an equal number of coal powder conveying pipes inside. The coal powder conveying pipes extend axially to the end of the coal powder channel in a spiral winding shape. A cyclone separator is provided at the end of the coal powder channel to help improve the mixing effect of coal powder at the burner outlet. A cyclone separator is provided at the constriction section at the end of the oxygen / water vapor channel so that the gasifying agent is sprayed out after swirling.

[0008] The ignition assembly consists of an ignition rod and a displacement drive mechanism. The ignition rod is installed in the center of the ignition fuel channel, and a high-voltage electric igniter is installed at the head of the ignition rod, which can automatically adjust the ignition voltage and ignition energy to generate a high-voltage electric arc to ignite the fuel gas. The other end of the ignition rod passes through the ignition fuel channel and is connected to the displacement drive mechanism outside the burner. Under the action of the displacement drive mechanism, the ignition rod can extend 5~20mm outside the ignition fuel channel.

[0009] As a further supplement to the above technical solution, the outlet end of the ignition fuel channel is tapered, and the angle between it and the central axis of the burner is 5°. o ~30 o .

[0010] As a further supplement to the above technical solution, the outlet end of the pulverized coal channel is streamlined and tapered, which is conducive to the rapid mixing of pulverized coal and gasifying agent in the gasifier; the outlet end of the ignition oxygen channel is streamlined and tapered, which can improve the mixing rate of ignition oxygen and ignition fuel, forming a short and thick jet flame.

[0011] As a further explanation of the above technical solution, the wear-resistant layer or wear-resistant ceramic is provided on the inner and outer walls of the streamlined constriction of the pulverized coal channel, which can effectively improve the service life of the burner.

[0012] As a further supplement to the above technical solution, in order to ensure uniform distribution of pulverized coal at the burner outlet, the number of pulverized coal feed pipes is ≥3, preferably 3~6.

[0013] As a further supplement to the above technical solution, the coal powder pipe outlet end face, the main oxygen pipe outlet end face, the ignition oxygen pipe outlet end face, and the ignition fuel pipe outlet end face of the burner body are arranged in a progressively recessed manner, and the recess between adjacent pipe outlet end faces is 5~20mm.

[0014] As a further supplement to the above technical solution, the number of swirls of the hydrocyclones installed at the ends of the pulverized coal channel and the oxygen / water vapor channel is 1 to 5; preferably, the number of swirls is 3 to 5.

[0015] As a further supplement to the above technical solution, the primary cooling jacket between the pulverized coal channel and the oxygen / steam channel can be eliminated. Preferably, a cooling jacket is provided, that is, only the outermost cooling jacket is retained.

[0016] As a further supplement to the above technical solution, the cooling medium in the cooling jacket can be one of water, refrigerant, mineral oil, or silicone oil; preferably, the cooling medium is water at 120~200℃, and the refrigerant is one of ethylene glycol, propylene glycol, or fluorinated liquid.

[0017] This utility model provides a method for using a dry powder gasification burner that deeply couples ignition, start-up, and process. Using the aforementioned dry powder gasification burner includes the following steps: (1) Start the burner circulating cooling water system to ensure that the primary cooling jacket and the secondary cooling jacket are operating normally; use high-pressure nitrogen to purge the pipeline and burner channel to remove combustible gases (oxygen content ≤0.5%) in the furnace and ensure ignition safety; (2) Introduce fuel gas into the ignition channel and oxygen into the ignition oxygen channel, and start the high-voltage electric igniter to ignite; (3) After confirming successful ignition, start the ignition displacement drive mechanism to withdraw the ignition gun, gradually increase the ignition fuel gas and ignition oxygen flow rate to form a stable flame, and control the jet velocity at the outlet of the ignition fuel channel to be 20~40m / s and the jet velocity at the outlet of the ignition oxygen channel to be 10~20m / s. (4) Introduce start-up gas into the pulverized coal channel and start-up oxygen into the oxygen / steam channel, and ignite the start-up gas with an ignition flame; (5) Confirm whether the start-up flame has been ignited. If it has been successfully ignited, switch the medium in the ignition fuel channel and the ignition oxygen channel to carbon dioxide or nitrogen protective gas, and the ignition flame will be extinguished. (6) Gradually increase the amount of start-up gas and start-up oxygen to form a stable flame, and control the jet velocity of the start-up gas outlet to be 10~30m / s and the jet velocity of the oxygen outlet to be 35~60m / s; (7) Control the furnace temperature to gradually increase. When the furnace temperature is ≥500℃, pulverized coal is introduced into the pulverized coal channel. The pulverized coal and the start-up gas mixture are injected into the furnace through the pulverized coal channel. After the pulverized coal is burned, it gradually replaces the start-up gas. (8) When the furnace temperature reaches ≥1000℃, stop supplying start-up gas to the pulverized coal channel and the system enters the gasification and pressurization stage, gradually increasing to the gasifier operating pressure.

[0018] As described in step (2) above, the ignition fuel can be one or more of LPG, diesel, methane, and propane; when multiple fuels are selected, they are a mixture in any proportion. As described in step (4) above, the start-up fuel can be one or more of LPG, diesel, methane, and propane; when multiple fuels are selected, they are a mixture in any proportion. As described in step (7) above, during the start-up phase of the gasifier, when starting the pulverized coal feeding, the initial feeding mass of pulverized coal is 2 to 10% of the rated mass flow rate.

[0019] The beneficial effects of this utility model are: (1) The ignition process is short and the flame temperature is low. The multi-layer cooling jacket outside the oxygen and oxygen / water vapor channel of the traditional composite gasification burner is eliminated, making the cooling integrated. The burner structure is simple, the size is reduced, and the processing and manufacturing difficulty is reduced. (2) Start-up and process are deeply coupled. The start-up gas and start-up oxygen are transported by pulverized coal channel and oxygen / steam channel respectively. The process channel can be reused, breaking through the traditional "multi-body parallel" mode of composite burners, simplifying the structure of gasification burners, reducing control nodes, and improving the reliability of burner operation. (3) Compared with traditional composite gasification burners, this utility model deeply couples ignition, start-up and process functions, improves the variable load adjustment capability of gasification burners, and meets the needs of flexible production in modern coal chemical plants. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a composite dry powder gasification burner with deep coupling of ignition-start-up-process of the present invention. Figure 2 This is an enlarged structural schematic diagram of the burner outlet end of this utility model; Figure 3 This is a logic diagram of the start-up and process coupling switching of the composite dry powder gasification burner of this utility model.

[0021] In the diagram: 1-Burn body, 2-Ignition assembly, 3-Ignition fuel pipe, 4-Ignition oxygen pipe, 5-First-stage cooling pipe, 6-Second-stage cooling pipe, 7-Baffle plate, 8-Ignition fuel channel, 9-Ignition oxygen channel, 10-Oxygen / water vapor channel, 11-First-stage cooling jacket, 12-Pulverized coal channel, 13-Second-stage cooling jacket, 14-Ignition fuel inlet pipe, 15-Ignition channel inlet flange, 16-Ignition oxygen inlet pipe, 17-Ignition oxygen inlet flange, 18-Oxygen / water vapor inlet pipe, 19-Oxygen / water vapor inlet flange, 20-Circulating cooling medium inlet, 21-Circulating cooling medium outlet, 22-Pulverized coal feed pipe, 23-Pulverized coal feed pipe flange, 24-Pulverized coal conveying circular pipe, 25-Cyclone separator, 26-Ignition rod, 27-High-voltage electric igniter, 28-Displacement drive mechanism. Detailed Implementation

[0022] The following describes some specific embodiments of the present invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. This embodiment is implemented based on the technical solution of the present invention and provides detailed implementation methods, but the protection scope of the present invention is not limited to the following embodiments.

[0023] like Figure 1 , 2 As shown in Figure 3, this utility model provides a composite dry powder gasification burner with deep coupling of ignition-start-up-process. The burner mainly consists of a burner body 1 and an ignition assembly 2. The burner body is assembled from coaxial circular tubes, which, from the inside out, are: an ignition fuel tube 3, an ignition oxygen tube 4, a primary cooling tube 5, and a secondary cooling tube 6. These tubes are connected by flanges, and the height of the top of each tube decreases sequentially. An annular cavity is formed between the inner and outer walls of the primary cooling tube 5 and the secondary cooling tube 6, with a vertical partition 7 in the middle of the annular cavity to form an internal and external reflux channel for the cooling medium. The coaxial circular tubes are stacked to form a multi-layered annular, hollow cavity, which, from the inside out, consists of: an ignition fuel channel 8, an ignition oxygen channel 9, an oxygen / water vapor channel 10, a primary cooling jacket 11, a pulverized coal channel 12, and a secondary cooling jacket 13. An ignition fuel inlet is provided on the top side wall of the ignition fuel channel 8. Pipe 14 and ignition channel inlet flange 15; the top side wall of ignition oxygen channel 9 is provided with ignition oxygen inlet pipe 16 and ignition oxygen inlet flange 17; the top side wall of oxygen / water vapor channel 10 is provided with oxygen / water vapor inlet pipe 18 and oxygen / water vapor inlet flange 19 respectively; the top side wall of the primary cooling jacket and the secondary cooling jacket is provided with circulating cooling medium inlet 20 and circulating cooling medium outlet 21 respectively, the medium enters from the outer layer, circulates and flows out from the inner layer; the top side wall of pulverized coal channel 12 is provided with multiple pulverized coal feed pipes 22 and pulverized coal feed pipe flanges 23, each feed pipe is evenly arranged along the circumferential direction at the same height, and the angle between the pulverized coal feed pipe 22 and the burner axis is 10~45 degrees. oThe coal powder channel is equipped with an equal number of coal powder conveying circular pipes 24, which extend axially to the end of the coal powder channel in a spiral winding shape. A cyclone separator 25 is provided at the end of the coal powder channel, which helps to improve the mixing effect of coal powder at the burner outlet. A cyclone separator 25 is provided at the constriction section at the end of the oxygen / water vapor channel, so that the gasifying agent is sprayed out after swirling. The ignition assembly 2 consists of an ignition rod 26 and a displacement drive mechanism 28. The ignition rod 26 is installed in the center of the ignition fuel channel 8. A high-voltage electric igniter 27 is installed at the head of the ignition rod, which can automatically adjust the ignition voltage and ignition energy to generate a high-voltage electric arc to ignite the fuel gas. The other end of the ignition rod passes through the ignition fuel channel 8 and is connected to the displacement drive mechanism 28 outside the burner. Under the action of the displacement drive mechanism, the ignition rod can extend 5~20mm outside the ignition fuel channel.

[0024] The outlet end of the ignition fuel channel 8 tapers towards the central axis of the burner, forming an angle of 5° with the central axis of the burner. o ~30 o .

[0025] The outlet end of the pulverized coal channel 12 is streamlined, which is conducive to the rapid mixing of pulverized coal and gasifying agent in the gasifier; the outlet end of the ignition oxygen channel 9 is streamlined, which can improve the mixing rate of ignition oxygen and ignition fuel, forming a short and thick jet flame.

[0026] In particular, by setting a wear-resistant layer or installing wear-resistant ceramics on the inner and outer walls of the streamlined constriction of the pulverized coal channel, the service life of the burner can be effectively improved.

[0027] The number of pulverized coal feed pipes 22 is ≥3, preferably 3~6.

[0028] Among them, the coal powder pipe outlet end face, the main oxygen pipe outlet end face, the ignition oxygen pipe outlet end face, and the ignition fuel pipe outlet end face of the burner body are arranged in a progressively recessed manner, and the recess between adjacent pipe outlet end faces is 5~20mm.

[0029] The number of swirls at the ends of the pulverized coal channel 12 and the oxygen / water vapor channel 10 is 1 to 5; preferably, the number of swirls is 3 to 5.

[0030] The cooling medium in the cooling jacket can be one of water, refrigerant (ethylene glycol, propylene glycol or fluorinated liquid), mineral oil, or silicone oil. Preferably, the cooling medium is water at 120~200°C.

[0031] This utility model provides a method for using the dry powder gasification burner with deep coupling of the above-mentioned ignition-start-up-process, including the following steps: (1) Start the burner circulating cooling water system to ensure that the primary cooling jacket 11 and the secondary cooling jacket 13 are operating normally; use high-pressure nitrogen to purge the pipelines and burner channels to remove combustible gases (oxygen content ≤0.5%) in the furnace and ensure ignition safety. (2) Ignition gas is introduced into the ignition fuel passage 8 and oxygen is introduced into the ignition oxygen passage 9. The high-voltage electric igniter 27 is started to ignite; (3) Confirm whether the ignition is successful. If the ignition is successful, start the ignition displacement drive mechanism 28 to withdraw the ignition gun, gradually increase the ignition gas and ignition oxygen flow rate to form a stable flame, and control the jet velocity at the outlet of the ignition fuel channel 8 to be 20~40m / s and the jet velocity at the outlet of the ignition oxygen channel 9 to be 10~20m / s. (4) Introduce start-up gas into the pulverized coal channel 12 and start-up oxygen into the oxygen / steam channel 10, and ignite the start-up fuel gas with an ignition flame. (5) Confirm whether the start-up flame has been ignited. If it has been successfully ignited, switch the medium in the ignition fuel channel 8 and the ignition oxygen channel 9 to carbon dioxide or nitrogen protective gas, and the ignition flame will be extinguished. (6) Gradually increase the amount of start-up gas and start-up oxygen to form a stable flame, and control the jet velocity of the start-up gas outlet to be 10~30m / s and the jet velocity of the oxygen outlet to be 35~60m / s; (7) Control the furnace temperature to gradually increase. When the furnace temperature is ≥500℃, pulverized coal is introduced into the pulverized coal channel 12. The pulverized coal and the start-up gas mixture are injected into the furnace through the pulverized coal channel 12. After the pulverized coal is burned, it gradually replaces the start-up gas. (8) When the furnace temperature reaches ≥1000℃, stop supplying start-up gas to the pulverized coal channel 12, and the system enters the gasification and pressurization stage, gradually increasing to the gasifier operating pressure.

[0032] In step (2), the ignition gas can be one or more of LPG, diesel, methane, and propane. When multiple types are selected, they are mixtures in any proportion.

[0033] In step (4), the start-up gas can be one or more of LPG, diesel, methane, and propane. When multiple types are selected, they are mixtures in any proportion.

[0034] In step (7), during the start-up phase of the gasifier, when starting the pulverized coal feeding, the initial feeding amount of pulverized coal is recommended to be 2 to 10% of the rated mass flow rate.

[0035] The following specific embodiment will enable those skilled in the art to have a more concrete understanding of the present invention.

[0036] A water-cooled wall dry powder fluidized bed gasifier has a processing capacity of 100 tons / day. Its gasification chamber has a diameter of 1200mm and a height of 5000mm. The coal type for gasification is Shenmu bituminous coal, the conveying gas is carbon dioxide, the operating pressure of the gasifier is 4.0MPa, and the gasification temperature is 1350℃.

[0037] The present invention improves the design of the gasifier burner. The specific dimensions of the composite dry powder gasification burner are as follows: inner diameter of the ignition fuel channel outlet is 16mm, outer diameter of the ignition oxygen channel outlet is 19.5mm, outer diameter of the oxygen / steam channel outlet is 50.5mm, outer diameter of the pulverized coal channel outlet is 117mm, and outer diameter of the burner body is 267mm. Three pulverized coal feed pipes are provided on the top side wall of the pulverized coal channel, evenly distributed along the circumference at the same height, with the angle between the feed pipes and the burner axis being 30°. o The number of swirls installed at the end of the pulverized coal channel is 3, and the number of swirls installed at the end of the oxygen / steam channel is 5. The indentation distance of the oxygen / steam pipe outlet face relative to the burner body outlet is 11 mm, and the indentation distance of the ignition fuel pipe outlet face is 13.5 mm. The indentation distance is based on the bottom plane of the outermost secondary cooling jacket, i.e., the distance from the pipe outlet to the bottom plane of the outermost secondary cooling jacket.

[0038] The operating parameters of the composite dry powder gasification burner with deep coupling of ignition, start-up, and process are as follows: During the preparation stage, the circulating water volume of the primary cooling jacket is 15m³. 3 / h, the circulating water volume of the secondary cooling jacket is 35m³ / h. 3 The circulating cooling water inlet temperature is 140℃, and the high-pressure nitrogen purging time is 5 minutes, with an outlet oxygen content of <0.5%. During the ignition phase, the ignition fuel is LPG with an initial flow rate of 40 Nm³. 3 / h (outlet velocity 30m / s), initial oxygen flow rate for ignition is 20.2Nm 3 / h (outlet velocity is 13.5m / s), ignition rod electric ignition voltage is 10kV, high-voltage electric igniter extends 5mm out of ignition gas channel; 5 minutes after successful ignition, LPG start-up gas (initial flow rate is 120Nm³) is introduced into the pulverized coal channel. 3 / h), oxygen / water vapor is introduced into the start-up oxygen channel (initial flow rate is 60.5 Nm³ / h). 3 / h), ignite the start-up gas with an ignition flame; after successful ignition, gradually increase the start-up gas volume to 350Nm. 3 / h (outlet velocity is 10.3 m / s), the oxygen supply is increased to 177 Nm³. 3The furnace temperature rise rate is approximately 5℃ / min (outlet velocity is 48.3 m / s). When the furnace temperature is >650℃, Shenmu bituminous coal with a particle size of <100μm is introduced into the pulverized coal channel (initial flow rate is 200 kg / h), and the flow rate of the start-up gas gradually decreases. When the furnace temperature is >1000℃, the start-up gas is stopped from being introduced into the pulverized coal channel, and the system is slowly pressurized to 3.5~4.0 MPa. The pulverized coal feed rate is 60% of the rated flow rate. After stabilizing for 2 hours, the system is switched to normal process operation.

[0039] The foregoing has shown and described the main features and advantages of this utility model. It will be apparent to those skilled in the art that the specific embodiments of this utility model are not limited to the details of the exemplary embodiments described above. Furthermore, without departing from the spirit or essential characteristics of this utility model, the inventive concept and design ideas of this utility model can be implemented in other specific forms, and these should be equivalently included within the protection scope disclosed in the technical solution of this utility model. Therefore, in all respects, the embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dry powder gasification burner with deep coupling of ignition-start-up-process, characterized in that: Including the burner body and ignition assembly; The burner body is assembled from coaxial circular tubes, consisting of, from the inside out, an ignition fuel tube, an ignition oxygen tube, a primary cooling tube, and a secondary cooling tube. These tubes are connected by flanges, and the height of their tips decreases sequentially. An annular cavity exists between the inner and outer walls of the primary and secondary cooling tubes, with a vertical baffle in the center to form an internal and external reflux channel for the cooling medium. The coaxial circular tubes are stacked together to form a multi-layered annular / hollow cavity, consisting of, from the inside out, an ignition fuel channel, an ignition oxygen channel, an oxygen / water vapor channel, and a primary cooling tube. The system includes a cooling jacket, a pulverized coal channel, and a secondary cooling jacket. The top sidewalls of the ignition fuel channel, ignition oxygen channel, and oxygen / water vapor channel are respectively equipped with inlet pipes and flange joints. The top sidewalls of the primary and secondary cooling jackets are respectively equipped with circulating cooling water inlets and outlets; the medium enters from the outer layer, circulates, and flows out from the inner layer. The top sidewall of the pulverized coal channel is equipped with multiple pulverized coal feed pipes and flange joints, with each pulverized coal feed pipe evenly arranged along the circumferential direction at the same height. The angle between the pulverized coal feed pipe and the burner axis is 10~45 degrees. o The coal powder channel is equipped with an equal number of coal powder conveying circular pipes, which extend axially to the end of the coal powder channel in a spiral winding shape. A hydrocyclone is provided at the end of the coal powder channel to help improve the mixing effect of coal powder at the burner outlet. A hydrocyclone is provided at the constriction section at the end of the oxygen / water vapor channel so that the gasifying agent is sprayed out after swirling. The ignition assembly consists of an ignition rod and a displacement drive mechanism. The ignition rod is installed in the center of the ignition fuel channel, and a high-voltage electric igniter is installed at the head of the ignition rod, which can automatically adjust the ignition voltage and ignition energy to generate a high-voltage electric arc to ignite the fuel gas. The other end of the ignition rod passes through the ignition fuel channel and is connected to the displacement drive mechanism outside the burner. Under the action of the displacement drive mechanism, the ignition rod extends 5-20mm outside the ignition fuel channel.

2. The dry powder gasification burner with deep coupling of ignition-start-up-process as described in claim 1, characterized in that: The outlet end of the ignition fuel channel tapers in a gradually narrowing shape, forming an angle of 5° with the central axis of the burner. o ~30 o The pulverized coal pipe outlet face, main oxygen pipe outlet face, ignition oxygen pipe outlet face, and ignition fuel pipe outlet face of the burner body are arranged in a recessed manner, with the recess between adjacent pipe outlet faces being 5~20mm.

3. The dry powder gasification burner with deep coupling of ignition-start-up-process as described in claim 1, characterized in that: The outlet end of the pulverized coal channel has a streamlined constriction, which is conducive to the rapid mixing of pulverized coal and gasifying agent in the gasifier; the outlet end of the ignition oxygen channel has a streamlined constriction, which can improve the mixing rate of ignition oxygen and ignition fuel, forming a short and thick jet flame.

4. The dry powder gasification burner with deep coupling of ignition-start-up-process as described in claim 3, characterized in that: The streamlined inlet of the pulverized coal channel has a wear-resistant layer or wear-resistant ceramic installed on its inner and outer walls.

5. The dry powder gasification burner with deep coupling of ignition-start-up-process as described in claim 1, characterized in that: The number of coal powder feed pipes is ≥3; the number of swirls of the swirl generators installed at the ends of the coal powder channel and the oxygen / water vapor channel is 1~5.

6. The dry powder gasification burner with deep coupling of ignition-start-up-process as described in claim 1, characterized in that: The primary cooling jacket between the pulverized coal channel and the oxygen / steam channel can be eliminated, meaning only the outermost cooling jacket is retained.

7. The dry powder gasification burner with deep coupling of ignition-start-up-process as described in claim 1, characterized in that: The cooling medium inside the cooling jacket is one of water, refrigerant, mineral oil, or silicone oil.

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