A biomass combustion boiler for purifying exhaust gas

Abstract

This invention discloses a biomass combustion boiler for purifying waste gas, relating to the field of environmentally friendly combustion furnaces. It solves the problem of incomplete biomass combustion leading to excessive black smoke in the waste gas, affecting purification efficiency. The biomass combustion boiler for purifying waste gas includes a metal support frame, a waste gas purification tower, and a waste gas guide pipe. The purification boiler structure is installed at the top of the metal support frame. The purification boiler structure includes a combustion-supporting telescopic rod, a cover-opening telescopic rod, an inner cylinder, and an outer cylinder. The output end of the cover-opening telescopic rod is connected to a combustion chamber top cover, which pushes the combustion chamber top cover to flip, opening and closing the outer cylinder. The output end of the combustion-supporting telescopic rod is connected to a metal support plate, which pushes the metal support plate up and down to shake the inner cylinder. This invention designs a double boiler (inner and outer cylinders) that can reduce boiler temperature. Biomass fuel is placed in the inner cylinder for combustion, and is cooled by incoming air, extending the boiler's combustion time, resulting in more complete combustion and introducing more air.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly combustion furnaces, specifically a biomass combustion boiler for purifying waste gas. Background Technology

[0002] The main components of exhaust gas from biomass boilers include particulate matter and toxic gases. Incomplete combustion of biomass fuel will produce black smoke emissions. At this time, the unburned carbon particles form black smoke, which appears as gray-black smoke to the naked eye. Its characteristics include high dust concentration, many types of pollutants, and large temperature fluctuations. At high temperatures, it is smoke, and after cooling, it becomes solid. Exhaust gas containing black smoke pollutes the environment and puts great pressure on the exhaust gas purification tower. The main reason for the generation of gray-black smoke is incomplete combustion. Complete combustion is characterized by grayish-white biomass combustion products appearing at the bottom of the cooled boiler. The combustible components in the fuel are completely oxidized, and the exhaust gas is white. At this time, the main components of the exhaust gas are carbon dioxide, water vapor, carbon monoxide, and hydrocarbons. The content of harmful substances in the exhaust gas is low, the smoke and dust emissions are low, and the exhaust gas purification tower has a low treatment pressure. Therefore, it can be seen that the main pain point in the purification and treatment of exhaust gas after combustion is the gray-black smoke caused by incomplete combustion. The main reasons for this situation are insufficient oxygen supply and insufficient boiler tolerance. When the boiler reaches a certain temperature and the combustion time is too long, its lifespan will also be affected. Although the boiler is made of high-temperature resistant materials, it is difficult to withstand high-temperature baking. Summary of the Invention

[0003] The purpose of this invention is to provide a biomass combustion boiler for purifying waste gas, so as to solve the problems mentioned in the background art.

[0004] The technical solution of the present invention is: a biomass combustion boiler for purifying waste gas, comprising a metal support frame, a waste gas purification tower and a waste gas guide pipe, wherein a purification boiler structure is installed at the top of the metal support frame and the purification boiler structure fully combusts biomass. The purified boiler structure includes a combustion-supporting telescopic rod, a cover-opening telescopic rod, an inner cylinder, and an outer cylinder. The output end of the cover-opening telescopic rod is connected to the combustion chamber top cover. The cover-opening telescopic rod pushes the combustion chamber top cover to flip and open / close the outer cylinder. The output end of the combustion-supporting telescopic rod is connected to a metal support plate. The combustion-supporting telescopic rod pushes the metal support plate up and down to shake the inner cylinder.

[0005] Furthermore, the purification boiler structure also includes a combustion chamber bottom shell, the bottom end of which is fixed to the top end of a metal support frame. A set of combustion chamber top covers is provided on both sides of the top end of the combustion chamber bottom shell, and the bottom end of the combustion chamber top cover is hinged to the combustion chamber bottom shell. The combustion chamber bottom shell and the two sets of combustion chamber top covers form a cylindrical shape. The telescopic rod for opening the lid is provided with a flip hinge on the side near the metal support frame, and the telescopic rod for opening the lid is hinged to the metal support frame through the flip hinge.

[0006] Furthermore, an air inlet cover is installed at the end of the combustion chamber bottom shell away from the exhaust gas guide pipe. The air inlet cover has an internally hollowed-out conical shape and multiple sets of through holes on its surface. An air inlet is installed at the middle position of the air inlet cover. An exhaust port is installed on the side of the combustion chamber bottom shell near the exhaust gas guide pipe, and the exhaust port and the exhaust gas guide pipe are connected through each other.

[0007] Furthermore, dustproof side collars are installed on both sides inside the combustion chamber bottom shell, and the combustion-supporting telescopic rod is installed on both sides of the metal support frame near the bottom end of the combustion chamber bottom shell. The output end of the combustion-supporting telescopic rod and the bottom end of the combustion chamber bottom shell are connected through to the dustproof side collars. The metal support plate installed at the output end of the combustion-supporting telescopic rod has a concave arc shape, and two sets of metal support plates are located on both sides of the bottom end of the inner cylinder.

[0008] Furthermore, the inner cylinder includes an inner cylinder head, which is located on one side inside the bottom shell of the combustion chamber. A fuel inlet is connected to the side of the inner cylinder head near the air inlet, and a fuel nozzle is installed on the side of the fuel inlet near the inner cylinder head. A vortex generator is installed on the side of the fuel nozzle near the inner cylinder head, and an ignition device is connected to the top of the inner cylinder head.

[0009] Furthermore, the inner cylinder head is connected to the inner cylinder main combustion zone on the side away from the vortex generator, the inner cylinder main combustion zone is connected to the inner cylinder supplementary combustion zone on the side away from the inner cylinder head, and the inner cylinder supplementary combustion zone is connected to the gas conduit on the side away from the inner cylinder main combustion zone. The gas conduit is tapered with a constricted tail end.

[0010] Furthermore, the inner cylinder head, the inner cylinder main combustion zone, the inner cylinder supplementary combustion zone, and the gas conduit are internally connected. The inner cylinder main combustion zone, the inner cylinder supplementary combustion zone, and the gas conduit all have an expansion on one side and a contraction on the other side. The inner cylinder head, the inner cylinder main combustion zone, the inner cylinder supplementary combustion zone, and the gas conduit are sequentially nested and connected.

[0011] Furthermore, multiple sets of film cooling holes are segmented and embedded at the circumferential edge of the inner cylinder main combustion zone, inner cylinder afterburning zone, and gas conduit near the air inlet. The film cooling holes expand outward toward the air inlet, and the multiple sets of film cooling holes are distributed in a ring with equal spacing about the transverse centerline of the inner cylinder.

[0012] Furthermore, the surfaces of the main combustion zone and the afterburning zone of the inner cylinder are inlaid with multiple sets of air inlets, and the multiple sets of air inlets are distributed in a ring at equal intervals about the transverse centerline of the inner cylinder.

[0013] Furthermore, the output end of the gas outlet is connected to a waste gas guide pipe, and the end of the waste gas guide pipe away from the purification boiler structure is connected to a waste gas purification tower.

[0014] This invention provides an improved biomass combustion boiler for purifying exhaust gas, which has the following improvements and advantages compared with the prior art: Firstly, this invention designs a dual-boiler system with inner and outer sections that can reduce boiler temperature. Biomass fuel is burned in the inner cylinder, where it is cooled by incoming air, extending the boiler's combustion time and resulting in more complete combustion. The inner cylinder has a barrel-shaped exterior, wider in the middle and narrower on both sides, and consists of an inner cylinder head, a main combustion zone, a secondary combustion zone, and a gas conduit. The gas conduit is conical with a tapered tail, and the inner cylinder head is connected to a vortex generator. Fuel is injected through the fuel inlet and ignited by an ignition device. The surfaces of the main combustion zone and secondary combustion zone are also equipped with multiple sets of annularly distributed air inlets. These inlets allow the incoming air to cool the inner cylinder wall to some extent, but this is insufficient; further measures are needed to reduce the temperature of the flame tube wall. Multiple sets of small film cooling holes are segmented along the circumferential edges of the main combustion zone, secondary combustion zone, and gas conduit near the air inlets, achieving film cooling through these holes. Figure 6 This is a schematic diagram of the airflow in this perforated film cooling method. The principle is that many small holes are made in sections around the circumference of the inner cylinder, allowing the airflow to enter the holes along the wall and travel a certain distance along the inner wall, effectively reducing the temperature of that section. Since one ring of small holes only reduces the temperature of one section, a multi-segment structure is used. The inner cylinder in the diagram has three segments. Figure 6 The arrows in the diagram indicate the direction of the cooling airflow through the orifice. Figures 6-10 This is a schematic diagram of a tubular combustion chamber with an inner cylinder equipped with a perforated film cooling method. There is a vortex generator and a fuel nozzle at the inlet of the inner cylinder, and an ignition device at the front end of the inner cylinder. The air intake cover installed on the side of the bottom shell of the combustion chamber near the air inlet is a hollow cone shape with multiple sets of through holes to increase the air intake in addition to the air inlet, and also plays a role in depressurization, alleviating the pressure difference between the inside and outside caused by the rapid expansion of the internal gas during combustion. The outer cylinder consists of a combustion chamber bottom shell and two sets of metal support plates. The air inlet end of the outer cylinder consists of an air inlet and an air expansion cover. The air outlet end of the outer cylinder is the air outlet. The air outlet is connected to the exhaust gas purification tower through an exhaust gas guide pipe. The white smoke generated after complete combustion is injected into the exhaust gas purification tower for final filtration before being discharged.

[0015] Secondly, it can be used for multiple combustions of denser and harder biomass types. After the first round of combustion, the inner cylinder is shaken up and down by activating the combustion-supporting telescopic rod to shake off the carbonized material on the surface of the biomass. The combustion-supporting telescopic rod retracts to return to its original shape, and then the second combustion is carried out. The metal support plate is used to support the two sides of the inner cylinder. The bottom end of the metal support plate is fixed to the inner rod of the combustion-supporting telescopic rod. The dustproof side collar plays a protective role, and the bottom end of the dustproof side collar has a through hole that matches the inner rod of the combustion-supporting telescopic rod to prevent the leakage of soot from the bottom when the metal support plate is raised and lowered. After combustion, activate the cover extension rod to retract the rod and open the top covers of the combustion chambers on both sides outward, allowing the outer cylinder to open. Then, the inner cylinder at the top of the metal tray can be removed. After rinsing the grayish-white carbonized powder left by the complete combustion inside the inner cylinder, it can be reused. This structure improves the combustion efficiency of biomass, minimizing the generation of black smoke in the exhaust gas through complete combustion. The boiler can purify the black smoke in the exhaust gas as much as possible before it reaches the exhaust gas purification tower, turning it into white smoke. This alleviates the working pressure on the exhaust gas purification tower and extends its service life. Furthermore, traditional purification towers require frequent maintenance when handling exhaust gases with large amounts of black smoke. Whether it's traditional spray tower dust collection, baghouse dust collection, or expensive electrostatic precipitators, the solids formed after the black smoke cools and condenses inside the exhaust gas purification tower need to be cleaned regularly. The exhaust gas purification system of biomass combustion boilers is the key to achieving environmental protection standards. Through scientific and reasonable process design and equipment selection, it can achieve ultra-low emissions of particulate matter and harmful gases, meeting the environmental protection requirements of key areas. Attached Figure Description

[0016] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the first structure of the purification boiler of the present invention; Figure 3 This is a schematic diagram of the second structure of the purification boiler of the present invention; Figure 4 This is a front view schematic diagram of the purification boiler structure of the present invention; Figure 5 This is an exploded structural diagram of the purification boiler structure of the present invention; Figure 6 This is a schematic diagram of the airflow direction in the combustion chamber of the present invention; Figure 7 This is a schematic diagram of the airflow direction of the gas film cooling orifice and the cross-sectional structure of the inner cylinder of the present invention. Figure 8 This is a three-dimensional view of the inner cylinder of the present invention; Figure 9This is a first cross-sectional perspective view of the inner cylinder of the present invention; Figure 10 This is a second cross-sectional perspective view of the inner cylinder of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Metal support frame; 2. Exhaust gas purification tower; 3. Purification boiler structure; 301. Combustion chamber bottom shell; 302. Expansion air inlet cover; 303. Gas conduit; 304. Combustion chamber top cover; 305. Combustion-supporting telescopic rod; 306. Opening telescopic rod; 307. Air inlet; 308. Flip hinge; 309. Air outlet; 310. Dustproof side collar; 311. Metal support plate; 312. Inner cylinder head; 313. Main combustion zone of the inner cylinder; 314. Secondary combustion zone of the inner cylinder; 315. Air inlet hole; 316. Fuel inlet; 317. Swirl generator; 318. Ignition device; 319. Gas film cooling hole; 320. Fuel nozzle; 4. Exhaust gas guide pipe. Detailed Implementation

[0018] The following will be combined with the appendix Figures 1 to 10 This invention will be described in detail, and the technical solutions in the embodiments of this invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0019] The present invention provides a biomass combustion boiler for purifying waste gas by means of improvements, including a metal support frame 1, a waste gas purification tower 2 and a waste gas guide pipe 4, wherein a purification boiler structure 3 is installed at the top of the metal support frame 1, and the purification boiler structure 3 fully combusts biomass. The purification boiler structure 3 includes a combustion-supporting telescopic rod 305, a cover-opening telescopic rod 306, an inner cylinder, and an outer cylinder. This design can reduce the boiler temperature of the inner and outer dual boilers. Biomass fuel is placed in the inner cylinder for combustion and is cooled by the air entering, which prolongs the combustion time of the boiler, making the combustion more complete and introducing more air. The output end of the cover-opening telescopic rod 306 is connected to the combustion chamber top cover 304. The cover-opening telescopic rod 306 pushes the combustion chamber top cover 304 to flip to open and close the outer cylinder. The output end of the combustion-supporting telescopic rod 305 is connected to a metal support plate 311. The combustion-supporting telescopic rod 305 pushes the metal support plate 311 up and down to shake the inner cylinder. After combustion, activate the cover extension rod 306 to retract the rod and open the combustion chamber top cover 304 on both sides outward so that the outer cylinder can be opened. Then, the inner cylinder at the top of the metal tray 311 can be taken out. The gray-white carbonized powder left by the complete combustion inside the inner cylinder can be rinsed clean and reused. The purification boiler structure 3 also includes a combustion chamber bottom shell 301. The bottom end of the combustion chamber bottom shell 301 is fixed to the top end of the metal support frame 1. A set of combustion chamber top covers 304 are respectively provided on both sides of the top end of the combustion chamber bottom shell 301, and the bottom end of the combustion chamber top cover 304 is hinged to the combustion chamber bottom shell 301. The combustion chamber bottom shell 301 and the two sets of combustion chamber top covers 304 form a cylindrical shape. The opening telescopic rod 306 is provided with a flip hinge 308 on the side near the metal support frame 1, and the opening telescopic rod 306 is hinged to the metal support frame 1 through the flip hinge 308. An expansion air intake cover 302 is installed at the end of the combustion chamber bottom shell 301 away from the exhaust gas guide pipe 4. The expansion air intake cover 302 has an internally hollowed-out conical shape and multiple sets of through holes on its surface. An air inlet 307 is installed at the middle position of the expansion air intake cover 302. The expansion air intake cover 302 has multiple sets of through holes, which can increase the air intake in addition to the air inlet 307 and play a role in depressurization, alleviating the pressure difference between the inside and outside of the gas caused by the rapid expansion of the internal gas during combustion. An outlet 309 is installed on the side of the combustion chamber bottom shell 301 near the exhaust gas guide pipe 4, and the outlet 309 and the exhaust gas guide pipe 4 are connected through each other. Dustproof side collars 310 are installed on both sides inside the combustion chamber bottom shell 301. Combustion-supporting telescopic rods 305 are installed on both sides of the metal support frame 1 near the bottom of the combustion chamber bottom shell 301. The output end of the combustion-supporting telescopic rods 305 and the bottom end of the combustion chamber bottom shell 301 and the dustproof side collars 310 are connected through the rods. The metal support plate 311 installed at the output end of the combustion-supporting telescopic rods 305 has a concave arc shape. Two sets of metal support plates 311 are located on both sides of the bottom of the inner cylinder. The outer cylinder is composed of the combustion chamber bottom shell 301 and two sets of metal support plates 311. The air inlet end of the outer cylinder is composed of an air inlet 307 and an air expansion cover 302. The air outlet end of the outer cylinder is an air outlet 309. The air outlet 309 is connected to the exhaust gas purification tower 2 through the exhaust gas guide pipe 4. The white smoke generated after complete combustion is injected into the exhaust gas purification tower 2 for final filtration and then discharged. The inner cylinder includes an inner cylinder head 312, which is located on one side inside the combustion chamber bottom shell 301. A fuel inlet 316 is connected to the side of the inner cylinder head 312 near the air inlet 307, through which fuel is injected. A fuel nozzle 320 is installed on the side of the fuel inlet 316 near the inner cylinder head 312, and a vortex generator 317 is installed on the side of the fuel nozzle 320 near the inner cylinder head 312. An ignition device 318 is connected to the top of the inner cylinder head 312, through which the fuel is ignited. The inner cylinder head 312 is connected to the inner cylinder main combustion zone 313 on the side away from the vortex generator 317. The inner cylinder main combustion zone 313 is connected to the inner cylinder supplementary combustion zone 314 on the side away from the inner cylinder head 312. The inner cylinder supplementary combustion zone 314 is connected to the gas conduit 303 on the side away from the inner cylinder main combustion zone 313. The gas conduit 303 is conical with a tapered tail end. The inner cylinder has a barrel-shaped exterior that is wide in the middle and narrows on both sides. It is composed of the inner cylinder head 312, the inner cylinder main combustion zone 313, the inner cylinder supplementary combustion zone 314 and the gas conduit 303. The inner cylinder head 312, the inner cylinder main combustion zone 313, the inner cylinder supplementary combustion zone 314 and the gas conduit 303 are internally connected. The inner cylinder main combustion zone 313, the inner cylinder supplementary combustion zone 314 and the gas conduit 303 are all in the shape of one side expanding and the other side contracting. The inner cylinder head 312, the inner cylinder main combustion zone 313, the inner cylinder supplementary combustion zone 314 and the gas conduit 303 are sequentially nested and connected. Multiple sets of film cooling holes 319 are segmentally embedded at the circumferential edges of the inner cylinder main combustion zone 313, inner cylinder afterburning zone 314, and gas conduit 303 near the air inlet 307. These film cooling holes 319 expand outwards towards the air inlet 307. The multiple sets of film cooling holes 319 are distributed in a ring with equal spacing about the transverse centerline of the inner cylinder. The film cooling method is achieved through these small-hole film cooling holes 319. Figure 6 This is a schematic diagram of the airflow in this perforated film cooling method. The principle is that many small holes are made in sections around the circumference of the inner cylinder, allowing the airflow to enter the holes along the wall and travel a certain distance along the inner wall, effectively reducing the temperature of that section. Since one ring of small holes only reduces the temperature of one section, a multi-segment structure is used. The inner cylinder in the diagram has three segments. Figure 6 The arrows in the diagram indicate the direction of the cooling airflow through the orifice. Figures 6-10 This is a schematic diagram of a tubular combustion chamber with an inner cylinder equipped with a perforated film cooling system. The surfaces of the main combustion zone 313 and the secondary combustion zone 314 of the inner cylinder are inlaid with multiple sets of air inlets 315, and the multiple sets of air inlets 315 are distributed in a ring at equal intervals about the transverse centerline of the inner cylinder. The surfaces of the main combustion zone 313 and the secondary combustion zone 314 of the inner cylinder are also provided with multiple sets of air inlets 315 distributed in a ring. The air entering the inner cylinder through the air inlets 315 can play a certain cooling role on the inner cylinder wall, but it is not enough. Some measures are needed to reduce the temperature of the flame tube wall. The outlet 309 is connected to the exhaust gas guide pipe 4 at its output end, and the end of the exhaust gas guide pipe 4 away from the purification boiler structure 3 is connected to the exhaust gas purification tower 2. Example 1: For biomass types with higher density and harder structure, multiple combustion cycles can be performed. After the first round of combustion, the inner cylinder is shaken up and down by activating the combustion-supporting telescopic rod 305 to shake off the carbonized material from the surface of the biomass. The combustion-supporting telescopic rod 305 retracts to its original shape, and then a second combustion cycle is performed. The metal support plate 311 is used to support both sides of the inner cylinder. The bottom end of the metal support plate 311 is fixed to the inner rod of the combustion-supporting telescopic rod 305. The dustproof side collar 310 serves a protective function, and the bottom end of the dustproof side collar 310 is provided with a through hole that cooperates with the inner rod of the combustion-supporting telescopic rod 305 to prevent the leakage of soot from the bottom when the metal support plate 311 is raised and lowered. In summary, this structure improves the combustion efficiency of biomass, minimizing the generation of black smoke in the exhaust gas through complete combustion. The boiler can purify the black smoke in the exhaust gas as much as possible before it reaches the exhaust gas purification tower 2, turning it into white smoke. This alleviates the working pressure on the exhaust gas purification tower 2 and extends its service life. Traditional purification towers require frequent maintenance when handling exhaust gases with large amounts of black smoke. Whether it's traditional spray tower dust removal, bag filter dust removal, or expensive electrostatic precipitators, the solids generated after the black smoke cools and solidifies inside the exhaust gas purification tower 2 need to be cleaned regularly. The biomass combustion boiler exhaust gas purification system is key to achieving environmental compliance. Through scientific and reasonable process design and equipment selection, it achieves ultra-low emissions of particulate matter and harmful gases, meeting the environmental requirements of key areas.

[0020] Working Principle: First, this invention designs an inner and outer dual boiler that can reduce boiler temperature. Biomass fuel is placed in the inner cylinder for combustion, and is cooled by the incoming air, extending the boiler's combustion time and making combustion more complete. It also introduces more air. The inner cylinder has a barrel-shaped exterior, wider in the middle and narrower on both sides, and is composed of an inner cylinder head 312, an inner cylinder main combustion zone 313, an inner cylinder supplementary combustion zone 314, and a gas conduit 303. The gas conduit 303 is conical with a tapered tail. The inner cylinder head 312 is connected to a vortex generator 317, and fuel is injected through the fuel inlet 316. Fuel is introduced and ignited by ignition device 318. Multiple sets of annularly distributed air inlets 315 are also provided on the surfaces of the main combustion zone 313 and the afterburning zone 314 of the inner cylinder. These air inlets 315 allow the air entering the inner cylinder to provide some cooling to the inner cylinder wall, but this is insufficient. Further measures are needed to reduce the temperature of the flame tube wall. Multiple sets of film cooling holes 319 are segmented along the circumferential edge of the main combustion zone 313, the afterburning zone 314, and the gas conduit 303 near the air inlet 307. These film cooling holes 319 achieve film cooling. Figure 6 This is a schematic diagram of the airflow in this perforated film cooling method. The principle is that many small holes are made in sections around the circumference of the inner cylinder, allowing the airflow to enter the holes along the wall and travel a certain distance along the inner wall, effectively reducing the temperature of that section. Since one ring of small holes only reduces the temperature of one section, a multi-segment structure is used. The inner cylinder in the diagram has three segments. Figure 6The arrows in the diagram indicate the direction of the cooling airflow through the orifice. Figures 6-10 This is a schematic diagram of a tubular combustion chamber with an inner cylinder equipped with a perforated film cooling method. At the inlet of the inner cylinder, there is a vortex generator 317 and a fuel nozzle 320. At the front end of the inner cylinder, there is also an ignition device 318. The diffuser air intake cover 302 installed on the side of the combustion chamber bottom shell 301 near the air intake port 307 has an internally hollow conical shape and is provided with multiple sets of through holes to increase the air intake in addition to the air intake port 307, and also plays a role in depressurization, alleviating the pressure difference between the inside and outside of the gas caused by the rapid expansion of the internal gas during combustion.

[0021] Then, the outer cylinder is composed of the combustion chamber bottom shell 301 and two sets of metal support plates 311. The air inlet end of the outer cylinder is composed of the air inlet 307 and the air expansion cover 302. The air outlet end of the outer cylinder is the air outlet 309. The air outlet 309 is connected to the exhaust gas purification tower 2 through the exhaust gas guide pipe 4. The white smoke generated after complete combustion is injected into the exhaust gas purification tower 2 for final filtration and then discharged.

[0022] Finally, for biomass types with higher density and harder structure, multiple combustion cycles can be performed. After the first round of combustion, the inner cylinder is shaken up and down by activating the combustion-supporting telescopic rod 305 to shake off the carbonized material from the surface of the biomass. The combustion-supporting telescopic rod 305 then retracts to its original shape, and a second combustion cycle is performed. The metal support plate 311 is used to support both sides of the inner cylinder. The bottom end of the metal support plate 311 is fixed to the inner rod of the combustion-supporting telescopic rod 305. The dustproof side collar 310 serves a protective function, and the bottom end of the dustproof side collar 310 has a through hole that mates with the inner rod of the combustion-supporting telescopic rod 305 to prevent soot leakage from the bottom when the metal support plate 311 is raised or lowered. After combustion is complete, activate the cover extension rod 306 to retract the rod and open the combustion chamber top covers 304 on both sides outward, allowing the outer cylinder to open. Then, the inner cylinder at the top of the metal tray 311 can be removed. After rinsing the grayish-white carbonized powder left by the complete combustion inside the inner cylinder, it can be reused.

[0023] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A biomass combustion boiler for purifying waste gas, comprising a metal support frame (1), a waste gas purification tower (2), and a waste gas guide pipe (4), characterized in that: The top of the metal support frame (1) is equipped with a purification boiler structure (3), and the purification boiler structure (3) fully combusts biomass; The purification boiler structure (3) includes a combustion-supporting telescopic rod (305), a cover-opening telescopic rod (306), an inner cylinder, and an outer cylinder. The output end of the cover-opening telescopic rod (306) is connected to the combustion chamber top cover (304). The cover-opening telescopic rod (306) pushes the combustion chamber top cover (304) to flip to open and close the outer cylinder. The output end of the combustion-supporting telescopic rod (305) is connected to a metal support plate (311). The combustion-supporting telescopic rod (305) pushes the metal support plate (311) to rise and fall to shake the inner cylinder.

2. The biomass combustion boiler for purifying waste gas according to claim 1, characterized in that: The purification boiler structure (3) also includes a combustion chamber bottom shell (301). The bottom end of the combustion chamber bottom shell (301) is fixed to the top end of the metal support frame (1). A set of combustion chamber top covers (304) are provided on both sides of the top end of the combustion chamber bottom shell (301). The bottom end of the combustion chamber top cover (304) is hinged to the combustion chamber bottom shell (301). The combustion chamber bottom shell (301) and the two sets of combustion chamber top covers (304) form a cylindrical shape. The opening telescopic rod (306) is provided with a flip hinge (308) on the side near the metal support frame (1), and the opening telescopic rod (306) is hinged to the metal support frame (1) through the flip hinge (308).

3. A biomass combustion boiler for purifying waste gas according to claim 2, characterized in that: The bottom shell (301) of the combustion chamber is equipped with an air inlet cover (302) at the end away from the exhaust gas guide pipe (4). The air inlet cover (302) has a hollow cone shape and multiple through holes on its surface. An air inlet (307) is installed at the middle position of the air inlet cover (302). An outlet (309) is installed on the side of the combustion chamber bottom shell (301) near the exhaust gas guide pipe (4), and the outlet (309) and the exhaust gas guide pipe (4) are connected through each other.

4. A biomass combustion boiler for purifying waste gas according to claim 3, characterized in that: Dustproof side collars (310) are installed on both sides inside the combustion chamber bottom shell (301). The combustion-supporting telescopic rod (305) is installed on both sides of the metal support frame (1) near the bottom end of the combustion chamber bottom shell (301). The output end of the combustion-supporting telescopic rod (305) and the bottom end of the combustion chamber bottom shell (301) are connected through to the dustproof side collar (310). The metal support plate (311) installed at the output end of the combustion-supporting telescopic rod (305) has a concave arc shape. Two sets of metal support plates (311) are located on both sides of the bottom end of the inner cylinder.

5. A biomass combustion boiler for purifying waste gas according to claim 4, characterized in that: The inner cylinder includes an inner cylinder head (312), and the inner cylinder head (312) is located on one side inside the combustion chamber bottom shell (301). The inner cylinder head (312) is connected to a fuel inlet (316) on the side near the air inlet (307), and a fuel nozzle (320) is installed on the side of the fuel inlet (316) near the inner cylinder head (312). A vortex generator (317) is installed on the side of the fuel nozzle (320) near the inner cylinder head (312). An ignition device (318) is connected to the top of the inner cylinder head (312).

6. A biomass combustion boiler for purifying waste gas according to claim 5, characterized in that: The inner cylinder head (312) is connected to the inner cylinder main combustion zone (313) on the side away from the vortex generator (317). The inner cylinder main combustion zone (313) is connected to the inner cylinder supplementary combustion zone (314) on the side away from the inner cylinder head (312). The inner cylinder supplementary combustion zone (314) is connected to the gas conduit (303) on the side away from the inner cylinder main combustion zone (313). The gas conduit (303) is a tapered shape with a constricted tail end.

7. A biomass combustion boiler for purifying waste gas according to claim 6, characterized in that: The inner cylinder head (312), the inner cylinder main combustion zone (313), the inner cylinder supplementary combustion zone (314), and the gas conduit (303) are internally connected. The inner cylinder main combustion zone (313), the inner cylinder supplementary combustion zone (314), and the gas conduit (303) all have an expansion on one side and a contraction on the other side. The inner cylinder head (312), the inner cylinder main combustion zone (313), the inner cylinder supplementary combustion zone (314), and the gas conduit (303) are sequentially nested and connected.

8. A biomass combustion boiler for purifying waste gas according to claim 7, characterized in that: The inner cylinder main combustion zone (313), inner cylinder supplementary combustion zone (314) and gas conduit (303) are segmented at the circumferential edge near the air inlet (307) with multiple sets of gas film cooling holes (319), and the gas film cooling holes (319) are expanded outward towards the air inlet (307), and the multiple sets of gas film cooling holes (319) are distributed in a ring with equal spacing about the transverse centerline of the inner cylinder.

9. A biomass combustion boiler for purifying waste gas according to claim 8, characterized in that: The surfaces of the main combustion zone (313) and the supplementary combustion zone (314) of the inner cylinder are inlaid with multiple sets of air inlets (315), and the multiple sets of air inlets (315) are distributed in a ring with equal spacing about the transverse centerline of the inner cylinder.

10. A biomass combustion boiler for purifying waste gas according to claim 3, characterized in that: The outlet (309) is connected to a waste gas guide pipe (4) at its output end, and the end of the waste gas guide pipe (4) away from the purification boiler structure (3) is connected to a waste gas purification tower (2).

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