An intelligent and clean biomass fluidized bed combustion furnace

Abstract

The present invention relates to the technical field of fluidized bed combustion furnaces, and in particular provides an intelligent and clean biomass fluidized bed combustion furnace. The intelligent and clean biomass fluidized bed combustion furnace includes an installation component, a mixed flow component, a feed component, a combustion furnace and an exhaust gas circulation component. The present invention can provide a uniform and continuous gas supply flow and biomass fuel to the combustion furnace, ensure the uniformity of the temperature of the combustion process in the combustion furnace, and use the gas supply flow to preheat and dry the biomass fuel, improve the combustion efficiency, reduce the influence of moisture on the combustion process, reduce fuel consumption and flue gas emissions, and improve the removal efficiency of sulfur dioxide in the flue gas, reduce the emission level of sulfur dioxide, and effectively control the generation of nitrogen oxides, improve energy efficiency, reduce energy waste, ensure that the combustion process is environmentally friendly and meets emission standards, and separate particulate matter from the initial combustion smoke generated by combustion, significantly reducing the pollution concentration of particulate matter in combustion emissions, meeting environmental protection requirements.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized bed combustion furnaces, and in particular provides an intelligent and clean biomass fluidized bed combustion furnace. Background Art

[0002] The biomass fluidized bed combustion furnace is a boiler equipment designed and manufactured based on fluidized bed combustion technology using biomass as fuel. Biomass includes renewable resources such as wood chips, straw, and wood waste. It has the advantages of low carbon emissions and renewability, and is widely used in the field of energy production. The biomass fluidized bed combustion furnace puts biomass particles or granular biomass fuel into the fluidized bed. Under the action of high temperature and high-speed airflow, the biomass particles are suspended and flowed in the bed to realize the combustion process. During the combustion process, the heat released by the biomass fuel is absorbed to generate high-temperature combustion gas, which is used to heat water vapor and generate steam to drive the steam turbine to generate electricity.

[0003] Biomass fluidized bed combustion furnaces have the advantages of high combustion efficiency, low emission of pollutants, and utilization of renewable resources, and are widely used in the fields of biomass energy utilization, biomass power generation, etc. At the same time, due to the complex and diverse characteristics of biomass fuels and the large variation in moisture content, the combustion process is more difficult to control, and the bed stability requirements are high. In addition, since the combustion of biomass fuels will produce more pollutants such as nitrogen oxides and particulate matter, there are higher requirements for tail gas recycling combustion treatment. Summary of the invention

[0004] Based on this, it is necessary to provide an intelligent and clean biomass fluidized bed combustion furnace to solve at least one technical problem in the background technology.

[0005] An intelligent and clean biomass fluidized bed combustion furnace, comprising an installation component, a mixing component, a feeding component, a combustion furnace and an exhaust gas circulation component. The installation component includes two mixing installation frames and a circulation installation frame. The bottoms of the two mixing installation frames are both installed at one end of the installation ground, and the two mixing installation frames are symmetrically inclined. The bottom of the circulation installation frame is installed at the other end of the installation ground. The mixing component is installed in the two mixing installation frames. The bottom of the feeding component is installed in the installation ground, and the feeding component is located between the mixing installation frame and the circulation installation frame. The top of the feeding component is connected to the mixing component. The bottom of the combustion furnace is installed in the installation ground, and the combustion furnace is located between the mixing installation frame and the circulation installation frame. The middle part of the combustion furnace is connected to the middle part of the feeding component. The interior of the combustion furnace is hollow to form a combustion cavity. A bed material layer is arranged at the bottom of the combustion cavity. The bed material layer is composed of limestone, quartz sand and alumina. A feeding groove is recessed at the bottom of the inner wall of the combustion cavity, and a feeding connecting pipe is convex on the outside of the feeding groove. A smoke outlet hole is recessed at the top of the combustion furnace, and a smoke outlet pipe is arranged at the top of the smoke outlet hole. A circulation return hole is recessed at the bottom of the combustion furnace, and a circulation return pipe is convex on the outside of the circulation return hole. The exhaust gas circulation component is installed in the circulation installation frame, and the exhaust gas circulation component is connected to the circulation return pipe and the smoke outlet pipe.

[0006] As a further improvement of the present invention, the mixing component includes two mixing elements, an oxygen inlet five-way pipe and an output five-way pipe. The two mixing elements are respectively installed in the two mixing installation frames. Each mixing element includes two mixing towers and a conical box. The middle parts of the two mixing towers are respectively installed at both ends of the top of the mixing installation frame. The middle part of the top surface of each mixing tower is convex with an air outlet elbow. The two ends of the top of the conical box are respectively installed at the bottoms of the two mixing towers. A suction pump is arranged at the bottom of the conical box. The oxygen inlet five-way pipe is in the shape of "仌". The two ends of both sides of the oxygen inlet five-way pipe are respectively fixedly connected to the tops of the four mixing towers, and the air inlet end of the oxygen inlet five-way pipe is arranged far away from the circulation installation frame. The air inlet end of the oxygen inlet five-way pipe is connected to an external oxygen conveyor through a pipeline. The output five-way pipe is in the shape of "仌". The two ends of both sides of the output five-way pipe are respectively connected to the tops of the four air outlet elbows, and the air outlet end of the output five-way pipe is arranged adjacent to the circulation installation frame.

[0007] As a further improvement of the present invention, the interior of each conical box is hollow to form a conical cavity, and a triangular separation block is convex in the middle of the top surface of the conical cavity.

[0008] As a further improvement of the present invention, the interior of each mixing tower is hollow to form a mixing cavity, and the mixing cavity is communicated with the conical cavity. A mixing air outlet groove is recessed at the top of the inner side of the mixing cavity, and an intake arc-shaped pipe is convex on the mixing air outlet groove. One end of the intake arc-shaped pipe is connected to the oxygen inlet five-way pipe. An air outlet hole is recessed in the middle of the top surface of the mixing cavity, and the air outlet hole is communicated with the inner cavity of the air outlet elbow. A conical inclined pipe is convex in the middle of the air outlet hole.

[0009] As a further improvement of the present invention, the feed assembly includes a feed installation tower, an air intake tower and a mixing element. A plurality of feed installation columns are protruding from the bottom of the outer wall of the feed installation tower, and the bottoms of the plurality of feed installation columns are all installed on the installation ground. A first conical tube is protruding from the top of the feed installation tower. The feed installation tower is hollow inside to form a feed cavity. A discharge trough is recessed on the side of the feed cavity away from the mixing flow assembly, a discharge connecting pipe is recessed on the outside of the discharge trough, a feed pipe is recessed on the top of the first conical tube, the feed pipe is connected to the feed cavity, the bottom of the air intake tower is installed on the top of the first conical tube, the air intake tower is hollow inside to form an air intake connecting cavity, a conical sliding ring is provided in the middle of the air intake connecting cavity, an air intake connecting groove is recessed in the middle of the inner side of the air intake connecting cavity, the air intake connecting groove is connected to the air outlet end of the output five-way pipe, and the top of the mixing element is slidably installed in the conical sliding ring.

[0010] As a further improvement of the present invention, the mixing element includes an elastic conical sliding shell, conical fan blades, a mounting shaft, a conical control seal and a plurality of distribution fan blades. The bottom of the outer wall of the elastic conical sliding shell is slidably installed in the conical sliding ring. The top surface of the elastic conical sliding shell is concavely provided with a conical compression chamber, and the middle part of the bottom surface of the conical compression chamber is concavely provided with a rotating ventilation hole. A ventilation mounting tube is convexly provided on the rotating ventilation hole. The bottom of the conical fan blade is installed on the top of the ventilation mounting tube. The top end of the mounting shaft is penetrated by the ventilation mounting tube and connected with the middle part of the conical fan blade. The conical control seal is rotatably installed in the middle part of the mounting shaft, and the top of the outer wall of the conical control seal is abutted against the inner wall of the first conical tube. The plurality of distribution fan blades are respectively installed at the bottom of the outer wall of the mounting shaft at intervals along the circumferential direction, and the distribution fan blades are located in the feed chamber.

[0011] As a further improvement of the present invention, the exhaust gas circulation component includes a primary screening and grading element, a secondary screening and separation element and a coal-saving dust collector. The primary screening and grading element, the secondary screening and separation element and the coal-saving dust collector are respectively installed in the circulation mounting frame at intervals along the length direction, and the primary screening and grading element is arranged adjacent to one end of the combustion furnace.

[0012] As a further improvement of the present invention, the primary screening and grading element includes a primary screening and grading tower, a primary screening air inlet pipe, a grading motor, a grading turbine fan and a conical diverter. The middle part of the primary screening and grading tower is installed on the top of the circulation mounting frame adjacent to one end of the combustion furnace. The inner wall of the primary screening and grading tower is hollow to form a primary screening and grading cavity. The bottom of the outer wall of the primary screening and grading cavity is concavely provided with a primary screening mounting hole. The bottom end of the primary screening and grading pipe is installed in the primary screening and grading hole, and the bottom end of the primary screening and grading pipe is connected to the end of the smoke outlet pipe away from the combustion furnace. The top end of the primary screening and grading pipe is arranged in the middle of the primary screening and grading cavity. A connecting hole is concavely provided in the part, a mounting tube is convexly provided on the top of the primary screening and grading tower, the inner cavity of the mounting tube is connected with the connecting hole, a primary screening smoke pipe is convexly provided on the end of the outer wall of the mounting tube away from the combustion furnace, the primary screening smoke pipe is connected with the inner cavity of the mounting tube, the top of the grading turbine fan is rotatably installed on the outer edge of the top surface of the primary screening and grading tower, the bottom of the grading motor is installed on the top of the mounting tube, the output shaft of the grading motor is convexly provided with a connecting column, the bottom end of the connecting column is penetrated through the connecting hole and connected with the top end of the grading turbine fan, the conical diverter is installed in the middle of the primary screening and grading cavity and is located directly above the top of the primary screening inlet pipe.

[0013] As a further improvement of the present invention, the secondary screen separation element includes a secondary screen separation tower, an arc-shaped air intake pipe and a separation smoke pipe. The secondary screen separation tower is installed in the middle of the circulation installation frame. The secondary screen separation tower is hollow inside to form a secondary screen separation chamber. A secondary screen air intake groove is recessed at the top of the secondary screen separation chamber. One end of the arc-shaped air intake pipe is installed in the secondary screen air intake groove, and the other end of the arc-shaped air intake pipe is connected to the primary screen smoke pipe. The bottom end of the separation smoke pipe is installed in the middle of the top surface of the secondary screen separation tower, and the internal cavity of the separation smoke pipe is connected to the secondary screen separation chamber. An arc-shaped smoke pipe is convexly provided on the top of the separation smoke pipe, and the arc-shaped smoke pipe is connected to the coal-saving dust collector.

[0014] As a further improvement of the present invention, a circulating reflux pipe is also arranged between the bottom of the secondary screening separation tower and the bottom of the primary screening and grading tower. The internal cavity of the circulating reflux pipe is connected with the secondary screening separation cavity and the primary screening and grading cavity, and one end of the circulating reflux pipe is connected with the circulating return pipe.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention can provide a uniform and continuous gas supply flow and biomass fuel for the combustion furnace, ensure the uniformity of the temperature of the combustion process in the combustion furnace, optimize the combustion process, avoid incomplete combustion or local coking problems caused by uneven temperature, and use the gas supply flow to preheat and dry the biomass fuel, thereby improving the combustion efficiency, reducing the impact of moisture on the combustion process, reducing fuel consumption and flue gas emissions, and improving the removal efficiency of sulfur dioxide in the flue gas, reducing the emission level of sulfur dioxide, and effectively controlling the generation of nitrogen oxides, improving energy efficiency, reducing energy waste, and ensuring that the combustion process is environmentally friendly and meets emission standards.

[0017] 2. The present invention can effectively separate the particulate matter from the initial combustion smoke generated by combustion, significantly reducing the pollution concentration of particulate matter in combustion emissions, meeting environmental protection requirements, and improving the environmental performance of the combustion system. The separated fine particle fuel and coarse particle fuel are returned to the combustion chamber through a circulating reflux pipe to participate in subsequent combustion, effectively utilizing recycled fuel, increasing the stability and continuity of combustion, and reducing the waste of raw materials. The present invention can also accurately control the reflux amount of fine particle fuel and coarse particle fuel, thereby finely adjusting the amount of fuel in the bed layer during the combustion process, thereby improving combustion efficiency and energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention.

[0019] Figure 2 It is a three-dimensional schematic diagram of another embodiment of the present invention.

[0020] Figure 3 FIG. 2 is a partial internal schematic diagram of an embodiment of the present invention.

[0021] Figure 4 FIG. 4 is an internal schematic diagram of another embodiment of the present invention.

[0022] Figure 5 It is a three-dimensional schematic diagram of yet another embodiment of the present invention.

[0023] Figure 6 Schematic diagram of the interior of the primary screening and grading element in one embodiment of the present invention.

[0024] Figure 7 Schematic diagram of the interior of a secondary screen separation element in one embodiment of the present invention.

[0025] In the figure:

[0026] 10. Installation assembly; 11. Mixed flow mounting frame; 12. Circulation mounting frame; 20. Mixed flow assembly; 21. Mixed flow element; 211. Mixed flow tower; 212. Conical box; 213. Air pump; 214. Air outlet elbow; 215. Conical cavity; 216. Triangular separation block; 217. Mixed flow cavity; 218. Mixed flow outlet slot; 219. Air inlet arc pipe; 241. Air outlet hole; 242. Conical inclined pipe; 22. Oxygen inlet five-way pipe; 23. Transport Outlet five-way pipe; 30, feed assembly; 31, feed installation tower; 311, feed installation column; 312, first tapered pipe; 313, feed cavity; 314, discharge trough; 315, discharge connecting pipe; 316, feed pipe; 32, air intake tower; 322, air intake connecting cavity; 321, tapered sliding ring; 323, air intake connecting groove; 33, mixing element; 331, elastic tapered sliding shell; 332, tapered fan blade; 333, installation shaft; 334 , conical control envelope; 335, distribution fan blade; 336, conical compression chamber; 337, rotating ventilation hole; 338, ventilation installation pipe; 40, combustion furnace; 41, smoke outlet; 42, smoke outlet pipe; 43, circulation return hole; 44, circulation return pipe; 45, feed connecting pipe; 50, tail gas circulation component; 51, primary screening and classification element; 511, primary screening and classification tower; 512, classification motor; 513, classification turbofan; 514, primary screening and classification Air pipe; 515, conical diverter; 516, primary screening and grading chamber; 517, mounting pipe; 518, connecting hole; 519, primary screening smoke pipe; 541, connecting column; 542, primary screening mounting hole; 52, secondary screening separation element; 521, secondary screening separation tower; 522, arc-shaped air inlet pipe; 523, separation smoke pipe; 524, secondary screening separation chamber; 525, secondary screening air inlet slot; 526, arc-shaped smoke pipe; 53, coal-saving dust collector; 55, circulation reflux pipe. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0028] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 7 A smart and clean biomass fluidized bed combustion furnace comprises an installation component 10, a mixed flow component 20, a feed component 30, a combustion furnace 40 and an exhaust gas circulation component 50. The installation component 10 comprises two mixed flow mounting frames 11 and a circulation mounting frame 12. The bottoms of the two mixed flow mounting frames 11 are both mounted on one end of the installation ground, and the two mixed flow mounting frames 11 are symmetrically inclined. The bottom of the circulation mounting frame 12 is mounted on the other end of the installation ground. The mixed flow component 20 is mounted in the two mixed flow mounting frames 11. The bottom of the feed component 30 is mounted in the installation ground, and the feed component 30 is located between the mixed flow mounting frame 11 and the circulation mounting frame 12. The top of the feed component 30 is connected to the mixed flow component 20. The bottom of the combustion furnace 40 is mounted in the installation ground. The combustion furnace 40 is located between the mixed flow mounting frame 11 and the circulation mounting frame 12, the middle part of the combustion furnace 40 is connected to the middle part of the feed assembly 30, the combustion furnace 40 is hollow inside to form a combustion chamber, a bed layer is arranged at the bottom of the combustion chamber, the bed layer is composed of limestone, quartz sand and alumina, a feed trough is recessed at the bottom of the inner wall of the combustion chamber, a feed connecting pipe 45 is convexly arranged on the outer side of the feed trough, a smoke outlet hole 41 is recessed at the top of the combustion furnace 40, a smoke outlet pipe 42 is arranged on the top of the smoke outlet hole 41, a circulation return hole 43 is recessed at the bottom of the combustion furnace 40, a circulation return pipe 44 is convexly arranged on the outer side of the circulation return hole 43, an exhaust gas circulation assembly 50 is installed in the circulation mounting frame 12, and the exhaust gas circulation assembly 50 is connected to the circulation return pipe 44 and the smoke outlet pipe 42.

[0031] The mixed-flow component 20 includes two mixed-flow elements 21, an oxygen inlet five-way pipe 22 and an output five-way pipe 23. The two mixed-flow elements 21 are respectively installed in two mixed-flow mounting brackets 11. Each mixed-flow element 21 includes two mixed-flow towers 211 and a conical box 212. The middle parts of the two mixed-flow towers 211 are respectively installed at both ends of the top of the mixed-flow mounting bracket 11. The middle of the top surface of each mixed-flow tower 211 is convexly provided with an air outlet elbow 214. The two ends of the top of the conical box 212 are respectively installed at the bottoms of the two mixed-flow towers 211. A suction pump 213 is arranged at the bottom of the conical box 212. The oxygen inlet five-way pipe 22 is in the shape of "仌". The two ends of both sides of the oxygen inlet five-way pipe 22 are fixedly connected to the tops of the four mixed-flow towers 211. And the air inlet end of the oxygen inlet five-way pipe 22 is set away from the circulation mounting bracket 12. The air inlet end of the oxygen inlet five-way pipe 22 is connected to an external oxygen conveyor through a pipeline. The output five-way pipe 23 is in the shape of "仌". The two ends of both sides of the output five-way pipe 23 are respectively connected to the tops of the four air outlet elbows 214. And the air outlet end of the output five-way pipe 23 is set adjacent to the circulation mounting bracket 12.

[0032] The inside of each conical box 212 is hollow to form a conical cavity 215. The middle of the top surface of the conical cavity 215 is convexly provided with a triangular separation block 216.

[0033] The inside of each mixed-flow tower 211 is hollow to form a mixed-flow cavity 217. The mixed-flow cavity 217 is communicated with the conical cavity 215. A mixed-flow air outlet groove 218 is concavely arranged at the inner top of the mixed-flow cavity 217. An air inlet arc-shaped pipe 219 is convexly arranged on the mixed-flow air outlet groove 218. One end of the air inlet arc-shaped pipe 219 is connected to the oxygen inlet five-way pipe 22. An air outlet hole 241 is concavely arranged in the middle of the top surface of the mixed-flow cavity 217. The air outlet hole 241 is communicated with the inner cavity of the air outlet elbow 214. A conical inclined pipe 242 is convexly arranged in the middle of the air outlet hole 241.

[0034] The feeding component 30 includes a feeding installation tower 31, an air inlet tower 32 and a mixing and conveying element 33. A plurality of feeding installation columns 311 are convexly arranged at the bottom of the outer wall of the feeding installation tower 31. The bottoms of the plurality of feeding installation columns 311 are all installed on the installation ground. A first conical pipe 312 is convexly arranged at the top of the feeding installation tower 31. The inside of the feeding installation tower 31 is hollow to form a feeding cavity 313. A discharge groove 314 is concavely arranged on the side of the feeding cavity 313 away from the mixed-flow component 20. A discharge connecting pipe 315 is convexly arranged outside the discharge groove 314. A feeding pipe 316 is convexly arranged at the top of the first conical pipe 312. The feeding pipe 316 is communicated with the feeding cavity 313. The bottom of the air inlet tower 32 is installed at the top of the first conical pipe 312. The inside of the air inlet tower 32 is hollow to form an air inlet connection cavity 322. A conical sliding ring 321 is arranged in the middle of the air inlet connection cavity 322. An air inlet connection groove 323 is concavely arranged in the middle of the inner side of the air inlet connection cavity 322. The air inlet connection groove 323 is connected to the air outlet end of the output five-way pipe 23. The top of the mixing and conveying element 33 is slidably installed in the conical sliding ring 321.

[0035] The mixing element 33 includes an elastic conical sliding shell 331, a conical fan blade 332, a mounting shaft 333, a conical control seal 334 and a plurality of distribution fan blades 335. The bottom of the outer wall of the elastic conical sliding shell 331 is slidably mounted in the conical sliding ring 321. The top surface of the elastic conical sliding shell 331 is concavely provided with a conical compression chamber 336. The middle part of the bottom surface of the conical compression chamber 336 is concavely provided with a rotating ventilation hole 337. The rotating ventilation hole 337 is convexly provided with a ventilation mounting tube 338. The conical fan blade 335 is provided with a conical compression chamber 336. The bottom of 32 is installed on the top of the ventilation installation tube 338, the top of the installation shaft 333 is passed through the ventilation installation tube 338 and connected with the middle of the conical fan blade 332, the conical control seal 334 is rotatably installed in the middle of the installation shaft 333, and the top of the outer wall of the conical control seal 334 is abutted against the inner wall of the first conical tube 312, and a plurality of distribution fan blades 335 are respectively installed at the bottom of the outer wall of the installation shaft 333 at intervals along the circumferential direction, and the distribution fan blades 335 are located in the feed chamber 313.

[0036] The exhaust gas circulation component 50 includes a primary screening and grading element 51, a secondary screening and separation element 52 and a coal-saving dust collector 53. The primary screening and grading element 51, the secondary screening and separation element 52 and the coal-saving dust collector 53 are respectively installed in the circulation mounting frame 12 at intervals along the length direction, and the primary screening and grading element 51 is arranged adjacent to one end of the combustion furnace 40.

[0037] The primary screening and grading element 51 includes a primary screening and grading tower 511, a primary screening air inlet pipe 514, a grading motor 512, a grading turbofan 513 and a conical diverter 515. The middle part of the primary screening and grading tower 511 is installed at the top of the circulation mounting frame 12 near the end of the combustion furnace 40. The inner wall of the primary screening and grading tower 511 is hollow to form a primary screening and grading cavity 516. The bottom of the outer wall of the primary screening and grading cavity 516 is concavely provided with a primary screening installation hole 542. The bottom end of the primary screening and grading pipe 514 is installed in the primary screening installation hole 542, and the bottom end of the primary screening and grading pipe 514 is connected to the end of the smoke outlet pipe 42 away from the combustion furnace 40. The top end of the primary screening and grading pipe 514 is arranged in the middle of the primary screening and grading cavity 516. The middle of the top surface of the primary screening and grading cavity 516 is concavely provided with a connecting hole 518. A mounting tube 517 is protrudingly provided on the top of the primary screening and grading tower 511, and the internal cavity of the mounting tube 517 is connected to the connecting hole 518. A primary screening smoke pipe 519 is protrudingly provided on the end of the outer wall of the mounting tube 517 away from the combustion furnace 40, and the primary screening smoke pipe 519 is connected to the internal cavity of the mounting tube 517. The top of the grading turbine fan 513 is rotatably installed on the outer edge of the top surface of the primary screening and grading tower 511, and the bottom of the grading motor 512 is installed on the top of the mounting tube 517. The output shaft of the grading motor 512 is protrudingly provided with a connecting column 541, and the bottom end of the connecting column 541 is penetrated through the connecting hole 518 and connected to the top of the grading turbine fan 513. The conical diverter 515 is installed in the middle of the primary screening and grading cavity 516 and is located directly above the top of the primary screening air inlet pipe 514.

[0038] The secondary sieve separation element 52 includes a secondary sieve separation tower 521, an arc-shaped air inlet pipe 522 and a separation smoke pipe 523. The secondary sieve separation tower 521 is installed in the middle of the circulation installation frame 12. The secondary sieve separation tower 521 is hollow inside to form a secondary sieve separation chamber 524. A secondary sieve air inlet groove 525 is recessed on the top of the secondary sieve separation chamber 524. One end of the arc-shaped air inlet pipe 522 is installed in the secondary sieve air inlet groove 525, and the other end of the arc-shaped air inlet pipe 522 is connected to the primary sieve smoke pipe 519. The bottom end of the separation smoke pipe 523 is installed in the middle of the top surface of the secondary sieve separation tower 521, and the internal cavity of the separation smoke pipe 523 is connected to the secondary sieve separation chamber 524. An arc-shaped smoke pipe 526 is convexly provided on the top of the separation smoke pipe 523, and the arc-shaped smoke pipe 526 is connected to the coal-saving dust collector 53.

[0039] A circulating reflux pipe 55 is also provided between the bottom of the secondary screening separation tower 521 and the bottom of the primary screening and grading tower 511 . The internal cavity of the circulating reflux pipe 55 is connected to the secondary screening separation chamber 524 and the primary screening and grading chamber 516 . One end of the circulating reflux pipe 55 is connected to the circulating return pipe 44 .

[0040] For example, in one embodiment: a plurality of heating wires are arranged in the mixing chamber 217 at intervals along the height direction, the feed pipe 316 is connected to an external biomass fuel feeder through a pipeline, and a drop control valve is provided at the bottom of the primary screening and grading tower 511 and the secondary screening and separation tower 521.

[0041] For example, in one embodiment: when it is necessary to feed for combustion, the external oxygen conveyor and two air pumps 213 will be started, the air pump 213 will perform suction and form a uniform temperature airflow in the conical cavity 215, the uniform temperature airflow will be evenly divided into the mixed flow cavity 217 under the diversion effect of the triangular separation block 216, and then a plurality of heating wires will be started to uniformly heat the uniform temperature airflow, at the same time, the external oxygen conveyor will enter the oxygen intake five-way pipe 22 through the air intake end of the oxygen intake five-way pipe 22 and be evenly delivered to the four mixed flow towers 211 through the oxygen intake five-way pipe 22, and then through the four air intake arc pipes. The gas supply airflow in the four mixing towers 211 will enter the output five-way pipe 23 synchronously through the gas outlet elbow 214, and then enter the gas inlet connecting chamber 322 through the gas outlet end of the output five-way pipe 23 through the gas inlet connecting groove 323, and impact the elastic conical sliding shell 331, so that the elastic conical sliding shell 331 is compressed and deformed and moves downward along the conical sliding ring 321, so that the mounting shaft 333 moves downward with it, so that the conical control seal 334 moves downward with it, so that the sealing action of the conical control seal 334 is completed. The gas flow disappears, so that the biomass fuel falling from the feed pipe 316 is carried into the feed chamber 313 together, and the biomass fuel is preheated and dried. At the same time, when the gas flow enters the bottom of the intake connecting chamber 322 from the rotating ventilation hole 337, the mounting shaft 333 is rotated, and then the multiple distribution blades 335 are rotated, and the biomass fuel carried by the gas flow is evenly mixed and sent to the discharge trough 314, and then enters the bed layer of the combustion chamber through the discharge connecting pipe 315 and the feed connecting pipe 45, and then the biomass fuel is ignited for combustion. Combustion heating produces initial combustion smoke, and because the gas supply flow can continuously and evenly carry the biomass fuel into the combustion chamber, the temperature in the combustion chamber is lower than that of the fossil energy combustion furnace and the combustion is even, so that the ash produced after the combustion of the biomass fuel will not melt, so when exchanging heat with the surface of the heat exchanger (not shown) during combustion, the problems of coking and corrosion are reduced, and the continuous delivery of the gas supply flow will increase the flow rate of the initial combustion smoke, accelerate the heat transfer and combustion process, and control the temperature of the combustion chamber, optimize the combustion conditions, and minimize the generation of nitrogen oxides. At the same time, the limestone in the bed layer can desulfurize the initial combustion smoke, reduce the emission level of sulfur dioxide, and ensure the environmental protection and energy efficiency requirements of the combustion emission flue gas.

[0042] For example, in one embodiment, when the primary combustion smoke is sent into the primary screening air inlet pipe 514 through the smoke outlet pipe 42 and enters the primary screening classification chamber 516, the primary combustion smoke will be diverted into the top of the primary screening classification chamber 516 through the conical diverter 515, and then the classification motor 512 will be started, driving the connecting column 541 to rotate and driving the classification turbine fan 513 to rotate rapidly, sucking the primary combustion smoke, sending the primary combustion smoke into the classification turbine fan 513 and then into the primary screening smoke pipe 519 through the connecting hole 518 and the mounting pipe 517 to form secondary combustion smoke. When the primary combustion smoke enters the interior of the grading turbine fan 513, the particles in the primary combustion smoke will be separated into coarse and fine particles under the centrifugal force generated by the rotation of the grading turbine fan 513. The fine particle fuel that meets the particle size requirements will enter the primary screening smoke pipe 519 through the gaps between the multiple turbine blades on the outer wall of the grading turbine fan 513, while the fine particle fuel agglomerates and the coarse particle fuel will be thrown out by the rotation of the multiple turbine blades and hit the top of the outer wall of the primary screening and grading chamber 516, so that the fine particle fuel agglomerates are separated into multiple fine particles. The fuel then falls to the middle of the primary screening and grading chamber 516. The separated multiple fine particles of fuel will be transported by the subsequent primary combustion smoke due to their smaller weight and merged into the subsequent primary combustion smoke, while the coarse particles of fuel will enter the bottom of the primary screening and grading chamber 516 due to their larger weight, and enter the circulation return pipe 55 through the drop control valve. The secondary combustion smoke flow will form a tangential airflow under the guidance of the arc-shaped air inlet pipe 522. The tangential airflow has a large inertial centrifugal force, so that the fine particles of fuel in the tangential airflow are thrown to the outer wall and separated, which has an impact on the secondary combustion smoke. The flow is then separated again and sent to the economizer 53, thereby greatly reducing the pollution concentration of particulate matter in the exhaust gas, and allowing the fine particle fuel to fall into the bottom of the secondary sieve separation chamber 524, enter the circulation reflux pipe 55 through the material drop control valve, and then flow back to the combustion chamber through the circulation reflux pipe 55 to participate in subsequent combustion. The reflux amount of fine particle fuel and coarse particle fuel can be accurately controlled by controlling the opening and closing degree of the material drop control valve, thereby further controlling the amount of fuel in the bed layer, thereby further realizing control of the combustion process.

[0043] Installation process: install the bottoms of the two mixed flow mounting frames 11 at one end of the installation ground, and the two mixed flow mounting frames 11 are symmetrically inclined, the bottom of the circulation mounting frame 12 is installed at the other end of the installation ground, the bottom of the combustion furnace 40 is installed in the installation ground, and the combustion furnace 40 is located between the mixed flow mounting frame 11 and the circulation mounting frame 12, the middle parts of the two mixed flow towers 211 are respectively installed at the two ends of the top of the mixed flow mounting frame 11, the two ends of the top of the conical box 212 are respectively installed at the bottom of the two mixed flow towers 211, the two ends on both sides of the oxygen inlet five-way pipe 22 are respectively fixedly connected to the tops of the four mixed flow towers 211, and the air inlet end of the oxygen inlet five-way pipe 22 is set away from the circulation mounting frame 12, and the air inlet end of the oxygen inlet five-way pipe 22 is connected to the outside through a pipeline. The oxygen conveyor of the boundary is connected, the two ends of both sides of the output five-way pipe 23 are respectively connected to the top of the four air outlet elbows 214, and the air outlet end of the output five-way pipe 23 is arranged adjacent to the circulation mounting frame 12, one end of the air inlet arc pipe 219 is connected to the oxygen inlet five-way pipe 22, the bottoms of multiple feed mounting columns 311 are all installed on the mounting ground, the bottom of the air inlet tower 32 is installed on the top of the first conical pipe 312, the bottom of the outer wall of the elastic conical sliding shell 331 is slidably installed in the conical sliding ring 321, the bottom of the conical fan blade 332 is installed on the top of the ventilation mounting pipe 338, the top of the mounting shaft 333 is penetrated through the ventilation mounting pipe 338 and connected to the middle of the conical fan blade 332, the conical control seal 334 is rotatably installed in the middle of the mounting shaft 333, and The top of the outer wall of the conical control seal 334 is against the inner wall of the first conical tube 312, and a plurality of distribution blades 335 are respectively installed at intervals along the circumferential direction at the bottom of the outer wall of the mounting shaft 333, and the distribution blades 335 are located in the feed chamber 313, and the middle part of the primary screening and grading tower 511 is installed on the top of the circulation mounting frame 12 adjacent to the end of the combustion furnace 40, and the bottom end of the primary screening air inlet pipe 514 is installed in the primary screening mounting hole 542, and the bottom end of the primary screening air inlet pipe 514 is connected to the end of the smoke outlet pipe 42 away from the combustion furnace 40, and the top end of the primary screening air inlet pipe 514 is arranged in the middle of the primary screening and grading chamber 516, and the top of the grading turbine fan 513 is rotatably installed on the outer edge of the top surface of the primary screening and grading tower 511, and the bottom of the grading motor 512 is installed on the top of the mounting pipe 517, The bottom end of the connecting column 541 is penetrated through the connecting hole 518 and connected to the top of the grading turbine fan 513. The conical diverter 515 is installed in the middle of the primary screening grading chamber 516 and is located directly above the top of the primary screening air inlet pipe 514. The secondary screening separation tower 521 is installed in the middle of the circulation mounting frame 12. One end of the arc-shaped air inlet pipe 522 is installed in the secondary screening air inlet groove 525. The other end of the arc-shaped air inlet pipe 522 is connected to the primary screening smoke pipe 519. The bottom end of the separation smoke pipe 523 is installed in the middle of the top surface of the secondary screening separation tower 521, and the internal cavity of the separation smoke pipe 523 is connected to the secondary screening separation chamber 524. One end of the circulation reflux pipe 55 is connected to the circulation return pipe 44. The coal-saving dust collector 53 is installed on the circulation mounting frame 12 away from the end of the primary screening grading tower 511.

[0044] The present invention can achieve:

[0045] 1. The present invention can provide a uniform and continuous gas supply flow and biomass fuel for the combustion furnace 40, ensure the uniformity of the temperature of the combustion process in the combustion furnace 40, optimize the combustion process, avoid incomplete combustion or local coking problems caused by uneven temperature, and use the gas supply flow to preheat and dry the biomass fuel, thereby improving the combustion efficiency, reducing the impact of moisture on the combustion process, reducing fuel consumption and flue gas emissions, and improving the removal efficiency of sulfur dioxide in the flue gas, reducing the emission level of sulfur dioxide, and effectively controlling the generation of nitrogen oxides, improving energy efficiency, reducing energy waste, and ensuring that the combustion process is environmentally friendly and meets emission standards.

[0046] 2. The present invention can effectively separate the particulate matter from the initial combustion smoke generated by combustion, significantly reducing the pollution concentration of particulate matter in the combustion emissions, meeting environmental protection requirements, and improving the environmental performance of the combustion system. The separated fine particle fuel and coarse particle fuel are returned to the combustion chamber through the circulation reflux pipe 55 to participate in subsequent combustion, effectively utilizing the recycled fuel, increasing the stability and continuity of combustion, and reducing the waste of raw materials. The present invention can also accurately control the reflux amount of fine particle fuel and coarse particle fuel, thereby finely adjusting the amount of fuel in the bed layer during the combustion process, thereby improving the combustion efficiency and energy utilization efficiency.

[0047] The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An intelligent and clean biomass fluidized bed combustion furnace, characterized in that: It includes an installation component (10), a mixed-flow component (20), a feeding component (30), a combustion furnace (40) and an exhaust gas circulation component (50). The installation component (10) includes two mixed-flow mounting frames (11) and a circulation mounting frame (12). The bottoms of the two mixed-flow mounting frames (11) are both installed at one end of the installation ground, and the two mixed-flow mounting frames (11) are symmetrically inclined. The bottom of the circulation mounting frame (12) is installed at the other end of the installation ground. The mixed-flow component (20) is installed in the two mixed-flow mounting frames (11). The bottom of the feeding component (30) is installed in the installation ground, and the feeding component (30) is located between the mixed-flow mounting frame (11) and the circulation mounting frame (12). The top of the feeding component (30) is connected to the mixed-flow component (20). The bottom of the combustion furnace (40) is installed in the installation ground, and the combustion furnace (40) is located between the mixed-flow mounting frame (11) and the circulation mounting frame (12). The middle part of the combustion furnace (40) is connected to the middle part of the feeding component (30). The interior of the combustion furnace (40) is hollow to form a combustion cavity. A bed material layer is arranged at the bottom of the combustion cavity. The bed material layer is composed of limestone, quartz sand and alumina. A feeding groove is recessed at the bottom of the inner wall of the combustion cavity, and a feeding connecting pipe (45) protrudes outside the feeding groove. A smoke outlet hole (41) is recessed at the top of the combustion furnace (40), and a smoke outlet pipe (42) is arranged at the top of the smoke outlet hole (41). A circulation return hole (43) is recessed at the bottom of the combustion furnace (40), and a circulation return pipe (44) protrudes outside the circulation return hole (43). The exhaust gas circulation component (50) is installed in the circulation mounting frame (12), and the exhaust gas circulation component (50) is connected to the circulation return pipe (44) and the smoke outlet pipe (42); The mixed-flow component (20) includes two mixed-flow elements (21), an oxygen inlet five-way pipe (22) and an output five-way pipe (23). The two mixed-flow elements (21) are respectively installed in the two mixed-flow mounting frames (11). Each mixed-flow element (21) includes two mixed-flow towers (211) and a conical box (212). The middle parts of the two mixed-flow towers (211) are respectively installed at both ends of the top of the mixed-flow mounting frame (11). The middle of the top surface of each mixed-flow tower (211) protrudes with an air outlet elbow pipe (214). The two ends of the top of the conical box (212) are respectively installed at the bottoms of the two mixed-flow towers (211). A suction pump (213) is arranged at the bottom of the conical box (212). The oxygen inlet five-way pipe (22) is in the shape of "仌". The two ends of both sides of the oxygen inlet five-way pipe (22) are fixedly connected to the tops of the four mixed-flow towers (211), and the air inlet end of the oxygen inlet five-way pipe (22) is arranged far away from the circulation mounting frame (12). The air inlet end of the oxygen inlet five-way pipe (22) is connected to an external oxygen conveyor through a pipeline. The output five-way pipe (23) is in the shape of "仌". The two ends of both sides of the output five-way pipe (23) are respectively connected to the tops of the four air outlet elbow pipes (214), and the air outlet end of the output five-way pipe (23) is arranged adjacent to the circulation mounting frame (12).

2. The intelligent and clean biomass fluidized bed combustion furnace according to claim 1 is characterized in that: The interior of each conical box (212) is hollow to form a conical cavity (215). A triangular separation block (216) protrudes from the middle of the top surface of the conical cavity (215).

3. The intelligent and clean biomass fluidized bed combustion furnace according to claim 2 is characterized in that: Each mixed flow tower (211) is hollow inside and has a mixed flow cavity (217) formed therein. The mixed flow cavity (217) is communicated with the conical cavity (215). A mixed flow outlet groove (218) is concavely provided at the top of the inner side of the mixed flow cavity (217). An air inlet arc tube (219) is convexly provided at the mixed flow outlet groove (218). One end of the air inlet arc tube (219) is connected to the oxygen inlet five-way tube (22). An air outlet hole (241) is concavely provided at the middle of the top surface of the mixed flow cavity (217). The air outlet hole (241) is communicated with the inner cavity of the air outlet elbow (214). A conical inclined tube (242) is convexly provided at the middle of the air outlet hole (241).

4. The intelligent and clean biomass fluidized bed combustion furnace according to claim 3 is characterized in that: The feed assembly (30) comprises a feed installation tower (31), an air intake tower (32) and a mixing element (33); a plurality of feed installation columns (311) are protrudingly provided at the bottom of the outer wall of the feed installation tower (31); the bottoms of the plurality of feed installation columns (311) are all installed on the installation ground; a first conical tube (312) is protrudingly provided at the top of the feed installation tower (31); a feed cavity (313) is formed in a hollow interior of the feed installation tower (31); a discharge trough (314) is concavely provided on a side of the feed cavity (313) away from the mixing flow assembly (20); a discharge connecting pipe (315) is protrudingly provided on the outer side of the discharge trough (314); and a first conical tube (312) is protrudingly provided on the top of the feed installation tower (31). A feed pipe (316) is protruding from the top of the conical tube (312), and the feed pipe (316) is communicated with the feed cavity (313). The bottom of the air intake tower (32) is mounted on the top of the first conical tube (312). An air intake connecting cavity (322) is formed in the hollow interior of the air intake tower (32). A conical sliding ring (321) is arranged in the middle of the air intake connecting cavity (322). An air intake connecting groove (323) is recessed in the middle of the inner side of the air intake connecting cavity (322). The air intake connecting groove (323) is connected to the air outlet end of the output five-way tube (23), and the top of the mixing element (33) is slidably mounted in the conical sliding ring (321).

5. The intelligent and clean biomass fluidized bed combustion furnace according to claim 4 is characterized in that: The mixing and conveying element (33) comprises an elastic conical sliding shell (331), conical blades (332), a mounting shaft (333), a conical control seal (334) and a plurality of distribution blades (335). The bottom of the outer wall of the elastic conical sliding shell (331) is slidably mounted in the conical sliding ring (321). A conical compression chamber (336) is concavely provided on the top surface of the elastic conical sliding shell (331). A rotating ventilation hole (337) is concavely provided in the middle of the bottom surface of the conical compression chamber (336). A ventilation mounting tube (338) is convexly provided on the rotating ventilation hole (337). The conical blades The bottom of the mounting shaft (332) is mounted on the top of the ventilation mounting tube (338), the top of the mounting shaft (333) passes through the ventilation mounting tube (338) and is connected to the middle of the conical fan blade (332), the conical control seal (334) is rotatably mounted on the middle of the mounting shaft (333), and the top of the outer wall of the conical control seal (334) is abutted against the inner wall of the first conical tube (312), and a plurality of distribution fan blades (335) are respectively installed at intervals along the circumferential direction at the bottom of the outer wall of the mounting shaft (333), and the distribution fan blades (335) are located in the feed chamber (313).

6. The intelligent and clean biomass fluidized bed combustion furnace according to claim 5 is characterized in that: The exhaust gas circulation component (50) comprises a primary screening and grading element (51), a secondary screening and separation element (52) and a coal-saving dust collector (53). The primary screening and grading element (51), the secondary screening and separation element (52) and the coal-saving dust collector (53) are respectively installed in the circulation installation frame (12) at intervals along the length direction, and the primary screening and grading element (51) is arranged adjacent to one end of the combustion furnace (40).

7. The intelligent and clean biomass fluidized bed combustion furnace according to claim 6 is characterized in that: The primary screening and grading element (51) comprises a primary screening and grading tower (511), a primary screening and grading air intake pipe (514), a grading motor (512), a grading turbofan (513) and a conical diverter (515). The middle part of the primary screening and grading tower (511) is installed on the top of the circulation mounting frame (12) adjacent to one end of the combustion furnace (40). The inner wall of the primary screening and grading tower (511) is hollow to form a primary screening and grading cavity (516). The bottom of the outer wall of the primary screening and grading cavity (516) is concavely provided with a primary screening mounting hole (542). The bottom end of the primary screening and grading air intake pipe (514) is installed in the primary screening and grading hole (542), and the bottom end of the primary screening and grading air intake pipe (514) is connected to one end of the smoke outlet pipe (42) away from the combustion furnace (40). The top end of the primary screening and grading air intake pipe (514) is arranged in the middle part of the primary screening and grading cavity (516). The middle part of the top surface of the primary screening and grading cavity (516) is concavely provided with a connecting hole (518). ), a mounting tube (517) is protrudingly provided on the top of the primary screening and grading tower (511), the internal cavity of the mounting tube (517) is communicated with the communicating hole (518), a primary screening smoke pipe (519) is protrudingly provided on the end of the outer wall of the mounting tube (517) away from the combustion furnace (40), the primary screening smoke pipe (519) is communicated with the internal cavity of the mounting tube (517), the top of the grading turbine fan (513) is rotatably mounted on the outer edge of the top surface of the primary screening and grading tower (511), the bottom of the grading motor (512) is mounted on the top of the mounting tube (517), the output shaft of the grading motor (512) is protrudingly provided with a connecting column (541), the bottom end of the connecting column (541) is passed through the communicating hole (518) and is connected to the top of the grading turbine fan (513), and the conical diverter (515) is installed in the middle of the primary screening and grading cavity (516) and is located directly above the top of the primary screening air inlet pipe (514).

8. The intelligent and clean biomass fluidized bed combustion furnace according to claim 7 is characterized in that: The secondary sieve separation element (52) comprises a secondary sieve separation tower (521), an arc-shaped air intake pipe (522) and a separation smoke pipe (523). The secondary sieve separation tower (521) is installed in the middle of the circulation installation frame (12). The secondary sieve separation tower (521) is hollow inside to form a secondary sieve separation chamber (524). A secondary sieve air intake groove (525) is recessed at the top of the secondary sieve separation chamber (524). One end of the arc-shaped air intake pipe (522) is installed in the secondary sieve air intake groove (525), and the other end of the arc-shaped air intake pipe (522) is connected to the primary sieve smoke pipe (519). The bottom end of the separation smoke pipe (523) is installed in the middle of the top surface of the secondary sieve separation tower (521), and the internal cavity of the separation smoke pipe (523) is connected to the secondary sieve separation chamber (524). An arc-shaped smoke pipe (526) is convexly provided at the top of the separation smoke pipe (523), and the arc-shaped smoke pipe (526) is connected to the economizer dust collector (53).

9. The intelligent and clean biomass fluidized bed combustion furnace according to claim 8 is characterized in that: A circulation reflux pipe (55) is further provided between the bottom of the secondary screening separation tower (521) and the bottom of the primary screening classification tower (511); the internal cavity of the circulation reflux pipe (55) is in communication with both the secondary screening separation chamber (524) and the primary screening classification chamber (516); and one end of the circulation reflux pipe (55) is connected to the circulation return pipe (44).

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