Pyrolysis combustion furnace

Abstract

The application provides a pyrolysis combustion furnace, and belongs to the technical field of energy-saving and environmental protection industry, wherein the combustion-supporting gas and the material for combustion are introduced into the top of a pyrolysis chamber, so that the semi-gasified gas is gathered in a combustion chamber above the pyrolysis chamber to form a flame, and almost no flame is formed in the pyrolysis chamber, the temperature in the pyrolysis chamber is relatively low, and the risks of coking and slagging are reduced; a special furnace bridge structure further reduces the risk of coking under the premise of meeting the efficient utilization of combustion materials; and the leakage ash structure is knocked by the action of a vibration unit, so that the risks of coking and slagging are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy-saving and environment-friendly industry, and particularly relates to a pyrolysis combustion furnace. BACKGROUND

[0002] Tobacco leaf drying treatment is a very important link in the process of tobacco production, which affects the quality and taste of tobacco, and is also related to the yield and economic benefits of tobacco. In the prior art, there are many methods for drying tobacco leaves, such as natural airing, air drying and baking, etc. Among them, baking tobacco leaves can quickly realize the drying treatment of a large amount of tobacco leaves, and has become the mainstream development direction of the current tobacco baking.

[0003] The heat source during tobacco baking is usually from a tobacco baking furnace. Most of the existing tobacco baking furnaces are direct-fired, and the fuels used are mostly coal, diesel and the like. These fuels may not be fully combusted during combustion, causing waste of energy, and a large amount of incompletely combusted fuel particles are easily discharged into the atmosphere, polluting the environment.

[0004] In recent years, biomass tobacco baking furnaces using biomass as fuel have emerged, which greatly improve the combustion efficiency and reduce the pollution to the environment. However, there are still some problems in the use of such tobacco baking furnaces, mainly including: 1. Compared with petrochemical fuels, biomass fuels are relatively clean, but the chlorine content in the exhaust gas after combustion is very high, and the emission amount of HCl gas is much higher than that of coal combustion; 2. Biomass fuels have the characteristics of high moisture content, many impurities, high ash content and high content of alkali metals, which are easy to form slag and coke in the furnace after combustion, thereby affecting the combustion efficiency and increasing the maintenance cost. Although the existing technology also proposes a method for reducing coking, the effect is not ideal; 3. The ignition speed is slow, and there are still some solid particles in the tail gas. When combustion is not sufficient, especially in the initial stage of ignition, black smoke is easily discharged from the chimney, polluting the environment.

[0005] Therefore, it is necessary to further improve the existing technology. SUMMARY

[0006] In view of the above problems existing in the prior art, the present application provides a pyrolysis combustion furnace, which aims to solve at least one of the above problems, improve the combustion effect of the existing biomass tobacco baking furnace, further improve the combustion efficiency, reduce the risk of slagging and coking in the furnace, and meet the environmental protection requirements.

[0007] In order to solve the above problems, the present application adopts the following technical scheme:

[0008] The pyrolysis combustion furnace comprises a pyrolysis furnace section, a first combustion furnace section, a second combustion furnace section, a dust-settling flue structure, heat dissipation fins, a chimney, a feeding hopper, a secondary air duct, a vertical communication pipe, a flue pipe and a top cover, wherein the pyrolysis furnace section, the first combustion furnace section, the vertical communication pipe, the second combustion furnace section, the flue pipe, the dust-settling flue structure and the top cover are sequentially connected from bottom to top, the interior of the pyrolysis furnace section is formed with a pyrolysis chamber, the interior of the first combustion furnace section is formed with a first combustion cavity, the interior of the second combustion furnace section is formed with a second combustion cavity, and the interior of the dust-settling flue structure is formed with a flue cavity, the feeding hopper is connected with the pyrolysis chamber in the interior of the pyrolysis furnace section through an auger structure and is used for conveying combustion materials to a position near the top of the pyrolysis chamber and close to the first combustion cavity, the pyrolysis chamber, the first combustion cavity, the second combustion cavity and the flue cavity are sequentially communicated from bottom to top, the combustion materials are semi-gasified and decomposed in the pyrolysis chamber, the decomposed gas enters the first combustion cavity for combustion, the gas after combustion in the first combustion cavity enters the second combustion cavity through the vertical communication pipe for further combustion, the flue gas after combustion in the second combustion cavity is discharged into the chimney through the flue pipe at the top of the second combustion cavity and is discharged into the atmosphere through the chimney, the outer periphery of the first combustion furnace section, the vertical communication pipe, the second combustion furnace section, the flue pipe and the dust-settling flue structure is formed with heat dissipation fins, the pyrolysis furnace section is connected with the secondary air duct, and the secondary air duct is connected with the top of the pyrolysis chamber.

[0009] Preferably, the pyrolysis furnace section comprises a pyrolysis furnace shell, and a first partition plate, a wind baffle, a second partition plate, an air inlet pipe, an air baffle, a dust baffle and a dust leakage structure arranged in the pyrolysis furnace shell, wherein the first partition plate is located above the second partition plate, the secondary air duct is arranged between the first partition plate and the second partition plate and is connected to the pyrolysis furnace shell, the air inlet pipe is fixedly connected to the middle part of the first partition plate and extends downward, a plurality of air inlet holes are uniformly arranged on the air inlet pipe, the bottom end of the air inlet pipe is fixedly connected with the dust baffle which extends downward, the dust leakage structure is fixedly connected to the middle part of the second partition plate, the wind baffle is fixedly arranged on the upper surface of the second partition plate between the dust leakage structure and the pyrolysis furnace shell and surrounds the dust leakage structure, the air baffle is fixedly arranged on the outer side of the whole formed by the fixed connection of the air inlet pipe and the dust baffle, the first gap is formed between the air baffle and the wind baffle, the second gap exists between the bottom of the dust baffle and the top of the dust leakage structure, and the diameter of the bottom of the dust baffle is substantially equal to the diameter of the top of the dust leakage structure, and the chamber surrounded by the air inlet pipe, the dust baffle and the dust leakage structure is the pyrolysis chamber.

[0010] Preferably, the output end of the auger structure is connected with an inlet hopper, the inlet hopper is located in the pyrolysis chamber, the hopper body of the inlet hopper is upwardly open, the inlet hopper is provided with an expanding diameter at the connecting end of the inlet hopper and the auger structure in the direction of the opening end of the inlet hopper, and the opening end of the inlet hopper is formed with a plurality of elastic sheet grooves which are spaced apart along the extension direction of the inlet hopper and form elastic sheet claws, wherein the closer to the middle of the pyrolysis chamber, the longer the length of the elastic sheet groove, the opening end of the inlet hopper is formed with an inclined surface, an included angle b is formed between the inclined surface and the horizontal plane, and the highest point of the inclined surface is located at the middle of the pyrolysis chamber.

[0011] Compared with the prior art, the present application has at least the following beneficial effects:

[0012] 1. The combustion-supporting gas and the material for combustion are introduced into the top of the pyrolysis chamber, so that the semi-gasified gas converges into the combustion chamber above the pyrolysis chamber to form a flame in normal operation, and almost no flame is formed in the pyrolysis chamber, so that the temperature in the pyrolysis chamber is relatively low, and the risk of coking and slagging is reduced;

[0013] 2. The special furnace bridge structure further reduces the risk of coking under the premise of meeting the efficient utilization of the combustion material;

[0014] 3. The special setting mode of the inlet hopper can make the combustion material and the combustion-supporting gas mix more fully, and if the material is excessive, the material will fall to the bottom of the pyrolysis chamber for further pyrolysis, and even if the material in the pyrolysis chamber is not fully combusted or pyrolyzed, the cooperation of the first combustion chamber and the second combustion chamber can also meet the environmental protection requirements;

[0015] 4. The setting of the vibration unit can flatten the fuel falling above the ash discharge structure, increase the contact area of the fuel and oxygen, and achieve the purpose of full pyrolysis, and the damper structure is arranged on the ash discharge structure, so that damping vibration can be achieved by knocking once, the number of knocking times is reduced, and the service life of the ash discharge plate, the vibration rod and the vibration unit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which similar reference characters refer to similar elements throughout the several views. In the following description, like reference characters refer to like elements throughout the several views.

[0017] Figure 1 is a schematic view of the three-dimensional structure of the pyrolysis combustion furnace of the present application;

[0018] Figure 2 is a schematic view of the rear view structure of the pyrolysis combustion furnace of the present application without the heat dissipation fins;

[0019] Figure 3This is a schematic diagram of the main structure of the pyrolysis combustion furnace of the present invention;

[0020] Figure 4 This is a side view of the pyrolysis combustion furnace of the present invention;

[0021] Figure 5 This is a cross-sectional structural schematic diagram of the pyrolysis combustion furnace of the present invention;

[0022] Figure 6 yes Figure 5 A partially enlarged view of the pyrolysis combustion furnace shown;

[0023] Figure 7 This is a three-dimensional structural diagram of the ash-leaking structure used in this invention under the installation and assembly conditions;

[0024] Figure 8 yes Figure 7 A top view of the structure under the installation and assembly of the ash-leaking structure shown.

[0025] Figure 9 yes Figure 7 The diagram shows the main view of the ash-leaking structure under the installation and assembly conditions.

[0026] Figure 10 This is a schematic diagram of the feed hopper used in this invention;

[0027] Figure 11 This is a schematic diagram of a preferred auger structure used in this invention;

[0028] Figure 12 This is a top view of the pyrolysis combustion furnace of the present invention with the heat dissipation fins and top cover removed.

[0029] Figure 13 This is a cross-sectional schematic diagram of the dust-reducing flue structure of the present invention;

[0030] Figure 14 This is a schematic diagram of the structure of the pyrolysis combustion furnace and the baking chamber of the present invention used in conjunction;

[0031] Figure 15 This is a top view schematic diagram of another preferred ash-leaking plate provided by the present invention;

[0032] Figure 16 yes Figure 15 A schematic diagram of the three-dimensional structure of the ash-slip plate and the furnace bridge seat in conjunction.

[0033] Figure 17 Is with Figure 15 A schematic diagram of the damping structure that cooperates with the ash-straining plate shown.

[0034] in,

[0035] 1-pyrolysis furnace section, 2-first combustion furnace section, 3-second combustion furnace section, 4-dust falling chimney structure, 5-radiating fin, 6-chimney, 7-feeding hopper, 8-observation window, 9-inspection opening, 10-secondary air duct, 11-vertical communication pipe, 12-flue pipe, 13-top cover, 14-ash box, 15-protection plate, 16-ignition gun, 17-vibration unit, 18-power unit, 19-ash hole, 20-ash collecting cavity, 21-furnace bridge structure, 22-auger structure, 23-feeding hopper, 24-first combustion cavity, 25-second combustion cavity, 26-flue cavity, 27-pyrolysis furnace shell, 28-first partition plate, 29-wind shield, 30-second partition plate, 31-air inlet pipe, 32-wind shield plate, 33-ash shield, 34-ash leakage structure, 35-vibration rod, 36-reduced section, 37-heating chamber, 38-baking chamber, 39-hot air blower, 40-air baffle, 41-damping structure, 42-spring,

[0036] 231-spring sheet slot,

[0037] 261-inner shell, 262-outer shell, 263-baffle, 264-ring table, 265-ring groove, 266-baffle sheet,

[0038] 341-furnace bridge seat, 342-ash leakage plate, 343-ash leakage groove,

[0039] 3411-vibration limiting groove, 3412-rotating shaft hole, 3421-rotating shaft, 3422-link, 3423-damping plate. Embodiment

[0040] Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0041] Example 1

[0042] As Figures 1 to 13As shown, the present application provides a pyrolysis combustion furnace, which comprises a pyrolysis furnace section 1, a first combustion furnace section 2, a second combustion furnace section 3, a dust-settling flue structure 4, heat dissipation fins 5, a chimney 6, a feeding hopper 7, a secondary air duct 10, a vertical communication pipe 11, a flue pipe 12 and a top cover 13, wherein the pyrolysis furnace section 1, the first combustion furnace section 2, the vertical communication pipe 11, the second combustion furnace section 3, the flue pipe 12, the dust-settling flue structure 4 and the top cover 13 are sequentially connected from bottom to top, the inside of the pyrolysis furnace section 1 is formed with a pyrolysis chamber, the inside of the first combustion furnace section 2 is formed with a first combustion cavity 24, the inside of the second combustion furnace section 3 is formed with a second combustion cavity 25, and the inside of the dust-settling flue structure 4 is formed with a flue cavity 26, the feeding hopper 7 is connected with the pyrolysis chamber in the pyrolysis furnace section 1 through an auger structure 22 (screw conveyor) to convey the combustion material (such as biomass particles) to the position near the top of the pyrolysis chamber and close to the first combustion cavity 24, the pyrolysis chamber, the first combustion cavity 24, the second combustion cavity 25 and the flue cavity 26 are sequentially communicated from bottom to top, in use, the combustion material is semi-gasified and decomposed in the pyrolysis chamber, the decomposed gas enters the first combustion cavity 24 to be combusted, the gas combusted in the first combustion cavity 24 enters the second combustion cavity 25 through the vertical communication pipe 11 to continue to be combusted, the flue gas formed after being combusted in the second combustion cavity 25 is discharged through the flue pipe 12 at the top thereof into the chimney 6 and then into the atmosphere through the chimney 6, the periphery of the first combustion furnace section 2, the vertical communication pipe 11, the second combustion furnace section 3, the flue pipe 12 and the dust-settling flue structure 4 is formed with the heat dissipation fins 5, the pyrolysis furnace section 1 is connected with the secondary air duct 10, and the secondary air duct 10 is connected with the top of the pyrolysis chamber. Preferably, the top of the top cover 13 is also provided with the heat dissipation fins 5.

[0043] It should be noted that the biomass combustion furnace used in the prior art is generally composed of a combustion furnace and a heat exchanger arranged above and below, the combustion furnace is below and the heat exchanger is above, the decomposition and combustion of biomass are carried out in a furnace chamber in the combustion furnace below, the temperature in the furnace chamber is relatively high, which is easy to cause the generation of slagging and coking phenomena, and the combustion is also easy to be insufficient, and the heat exchanger at the top generally uses a detour pipeline for heat exchange. The pyrolysis combustion furnace of the present application sequentially forms a pyrolysis chamber, a first combustion chamber 24, a second combustion chamber 25 and a flue chamber 26 from bottom to top inside the pyrolysis combustion furnace, a secondary air duct 10 for feeding combustion-supporting gas (such as air, oxygen, etc.) is connected in communication with the top of the pyrolysis chamber, and a feeding hopper 7 is used to feed the material for combustion to the position near the top of the pyrolysis chamber close to the first combustion chamber 24. When entering the pyrolysis chamber, whether it is combustion-supporting gas or material for combustion, it is located near the top of the pyrolysis chamber. Since the flame of combustion is upward, a flame is formed in the first combustion chamber 24. During normal operation, the combustion-supporting gas introduced into the pyrolysis furnace is relatively small, so it is difficult to form a flame in the pyrolysis chamber, which makes the temperature in the pyrolysis chamber much lower than that in the combustion chamber (24, 25), thereby greatly reducing the risk of coking and slagging. With the continuous feeding of the material for combustion, the material continuously falls from the top of the pyrolysis chamber to the bottom of the pyrolysis chamber, and the material continues to decompose during the falling process, thereby forming a large amount of semi-gasification combustion gas. In addition, the semi-gasification combustion gas is subjected to secondary combustion through the first combustion chamber 24 and the second combustion chamber 25 arranged in communication with each other, the combustion is more complete, the first combustion chamber 24 and the second combustion chamber 25 are communicated through a plurality of vertical communication pipes 11, the cross-sectional area of the vertical communication pipe 11 is much smaller than that of the first combustion chamber 24 and the second combustion chamber 25, which can form a certain blockage to the smoke dust of the first combustion chamber 24, and at the same time facilitates the arrangement of more heat dissipation fins 5, thereby improving the heat utilization efficiency.

[0044] In order to better achieve the purpose of the present application, the pyrolysis furnace section 1 of the present application comprises a pyrolysis furnace shell 27, and a furnace bridge structure 21 arranged in the pyrolysis furnace shell 27, which comprises a first partition plate 28, a wind baffle 29, a second partition plate 30, an air inlet cylinder 31, a wind baffle plate 32, a dust baffle cylinder 33 and a dust leakage structure 34 (see Figure 6), wherein the first baffle plate 28 is located above the second baffle plate 30, the secondary air duct 10 is arranged between the first baffle plate 28 and the second baffle plate 30 and communicates into the pyrolysis furnace shell 27, the middle part of the first baffle plate 28 is fixedly connected with the air inlet cylinder 31 which is downwardly flared and penetrates the first baffle plate 28 from top to bottom, a plurality of air inlet holes are uniformly arranged on the air inlet cylinder 31, the bottom end of the air inlet cylinder 31 is fixedly connected with the ash blocking cylinder 33 which is downwardly flared, the middle part of the second baffle plate 30 is fixedly connected with the ash leakage structure 34, the wind blocking cylinder 29 is fixedly arranged around the ash leakage structure 34 on the upper surface of the second baffle plate 30 between the ash leakage structure 34 and the pyrolysis furnace shell 27, the wind blocking plate 32 is further fixedly arranged outside the whole formed by the fixed connection of the air inlet cylinder 31 and the ash blocking cylinder 33, the first gap is formed between the wind blocking plate 32 and the wind blocking cylinder 29, the second gap exists between the bottom of the ash blocking cylinder 33 and the top of the ash leakage structure 34, and the diameter of the bottom of the ash blocking cylinder 33 is substantially equal to (may be slightly smaller than) the diameter of the top of the ash leakage structure 34, and the chamber surrounded by the air inlet cylinder 31, the ash blocking cylinder 33 and the ash leakage structure 34 is the pyrolysis chamber. The first gap and the second gap are mainly arranged to allow a small amount of combustion-supporting gas to enter the bottom of the pyrolysis chamber, to ensure the continuous pyrolysis of the falling materials, and to achieve the full use of the biomass fuel. The specific size is determined by the designer according to the actual needs, and will not be described in detail here. In use, referring to Figure 6 , the combustion-supporting gas flows upwardly after entering the secondary air duct 10 due to the shielding effect of the wind blocking cylinder 29, most of the combustion-supporting gas enters the air inlet cylinder 31 (i.e. the top of the pyrolysis chamber) through the air inlet holes on the air inlet cylinder 31, and a small amount of the combustion-supporting gas flows downwardly through the first gap and then enters the top of the ash leakage structure 34 (i.e. the bottom of the pyrolysis chamber) through the second gap. Through such an arrangement, the semi-gasification decomposition in the pyrolysis chamber is ensured, and the combustion requirements of the first combustion chamber 24 and the second combustion chamber 25 above are met, thereby reducing the risk of coking under the premise of meeting the efficient use of the combustion materials.

[0045] Preferably, the wind blocking cylinder 29 is further provided with the maintenance opening 9 which extends horizontally from the wind blocking cylinder 29 (not shown in the figure) to the outside of the pyrolysis furnace shell 27. The maintenance opening 9 is mainly arranged to prevent too much ash from blocking the second gap, especially the accumulation between the wind blocking cylinder 29 and the ash leakage structure 34.

[0046] Preferably, the first combustion furnace section 2 and / or the second combustion furnace section 3 are further provided with the fire observation window 8 which communicates to the respective internal chambers (the first combustion chamber 24 and the second combustion chamber 25) for observing the combustion conditions in the respective chambers.

[0047] Preferably, two secondary air ducts 10 are arranged on the left and right sides of the pyrolysis furnace section, and the secondary air ducts 10 are further formed with buffer cavities at the positions connected with the pyrolysis furnace shell 27. The above arrangement is to ensure uniform and stable air intake.

[0048] In a preferred embodiment, a dust collecting cavity 20 is formed below the second partition plate 30 in the pyrolysis furnace shell 27, and a dust removal box 14 is arranged on the pyrolysis furnace shell 27 corresponding to the dust collecting cavity 20. The dust removal box 14 is connected to the dust collecting cavity 20 through a dust removal hole 19 in the dust removal box 14, and is used to clean the ash accumulated in the dust collecting cavity 20 after falling down from the ash leakage structure 34. The dust removal hole 19 can be used as a supply channel for primary air, and is opened to supply combustion-supporting gas during ignition or normal combustion.

[0049] In order to better achieve the purpose of the present application, the output end of the auger structure 22 is connected with a feeding hopper 23, the feeding hopper 23 is located in the pyrolysis chamber, the hopper body of the feeding hopper 23 is upwardly open, the connecting end of the feeding hopper 23 connected with the auger structure 22 is arranged in the direction of the opening end of the feeding hopper 23, the feeding hopper 23 is arranged in an expanding diameter manner, and the opening end of the feeding hopper 23 is formed with a plurality of spring sheet grooves 231 arranged along the extension direction of the feeding hopper 23, the spring sheet grooves 231 separate the opening end of the feeding hopper 23 into spring sheet claws, wherein the closer to the middle of the pyrolysis chamber, the longer the length of the spring sheet grooves 231, the opening end of the feeding hopper 23 is formed with an inclined surface, an included angle b is formed between the inclined surface and the horizontal plane, the highest point of the inclined surface is located in the middle of the pyrolysis chamber, and the closer to the edge of the pyrolysis chamber (for example Figure 6The lower the inner wall of the middle air inlet cylinder 31 is. Through such a setting, when the material for combustion is transported by the auger structure 22 from the feeding hopper 7 to the feeding hopper 23, as the continuous transportation of the material, the material at the feeding hopper 23 continuously increases, at this time, the spring sheet claw is deformed under the extrusion of the material, so that the opening end of the feeding hopper 23 is expanded, and at the same time, the spacing of the spring sheet groove 231 is also expanded. Such a setting can on the one hand carry more material, so that more material is in contact with the combustion-supporting gas from the secondary air duct pipe 10, thereby improving the utilization rate of the biomass fuel, and on the other hand, if the material is too much, the spring sheet groove 231 will become very large, especially the spring sheet groove 231 near the middle of the pyrolysis chamber. At this time, the excess material can fall through the spring sheet groove 231 to the bottom of the pyrolysis chamber, avoiding excessive accumulation of the material at the opening end of the feeding hopper 23, which is easy to cause insufficient combustion of the material for combustion; in addition, the falling material is pyrolyzed in the pyrolysis chamber. Even if there is insufficient pyrolysis or combustion in the pyrolysis chamber, it can also be quickly burned with the help of the first combustion chamber 24 and the second combustion chamber 25, thereby ensuring that the tail gas discharged into the atmosphere meets the environmental protection requirements. It should be noted that the feeding hopper 23 and the auger structure 22 are detachably connected, which can be threaded connection, clamping, flange connection, positioning connection by bolts, or any other detachable connection mode. The purpose of detachable connection is to facilitate replacement, and different feeding hoppers 23 are selected for different materials.

[0050] To better achieve the purpose of the present invention, the ash-leaking structure 34 used in this embodiment includes a furnace bridge seat 341 and an ash-leaking plate 342 movably disposed in the furnace bridge seat 341. The ash-leaking plate 342 has a plurality of strip-shaped ash-leaking grooves 343. The furnace bridge seat 341 is a circular structure. The furnace bridge seat 341 is fixedly disposed in the central circular hole of the second partition 30 through its outer circumference, so that the ash formed by the combustion of the material above the ash-leaking plate 342 can leak into the ash collection chamber 20 below the second partition 30 through the ash-leaking grooves 343. Furthermore, the pyrolysis combustion furnace also includes a vibration unit 17 and a vibration rod 35. The vibration unit 17 (e.g., a vibration motor) is disposed outside the pyrolysis furnace shell 27. One end of the vibration rod 35 is connected to the vibration unit 17, and the other end of the vibration rod 35 extends to the bottom of the ash-straining plate 342 after passing through the pyrolysis furnace shell 27 (a hole is formed on the pyrolysis furnace shell 27 and the size of the hole is larger than the diameter of the vibration rod 35). It is used to vibrate and strike the ash-straining plate 342 when the vibration unit 17 is activated. The striking position of the vibration rod 35 on the ash-straining plate 342 is off-center from the center of the ash-straining plate 342. Preferably, the striking position is located near the edge of the ash-straining plate 342. In existing technologies, when treating ash leakage, the ash leakage plate 342 is typically moved up and down by a motor shaft or similar device. The motor shaft is usually fixed in the middle of the ash leakage plate 342. Although this method can improve the ash leakage effect, the effect is not ideal and cannot completely solve the problems of coking and slagging. The present invention uses a deviated tapping method. Under the action of high-frequency tapping, the ash leakage plate 342 bounces from side to side, resulting in a better ash leakage effect and effectively reducing the slagging problem at the ash leakage plate 342.

[0051] Furthermore, such as Figures 7 to 9 As shown, the radial axis of the ash-slip plate 342 corresponding to the striking position of the vibrating rod 35 against the ash-slip plate 342 ( Figure 8 The vertical axis shown is taken as the first axis, and the radial axis of the ash-straining plate 342 perpendicular to it is ( Figure 8 If the transverse axis shown is taken as the second axis, then the extension direction of the ash trough 343 forms an acute angle with either the first or second axis, for example... Figure 8 The included angle 'a' is shown. This method improves the ash leakage effect, similar to the effect of included angle 'c', which will be described in detail below and will not be repeated here.

[0052] In order to better achieve the purpose of the present application, preferably, the auger structure 22 comprises an auger sleeve and a rotating shaft with helical blades arranged in the auger sleeve, wherein a reduced diameter section 36 is formed in the middle of the extension direction of the auger sleeve, and the corresponding helical blades at the reduced diameter section 36 are thicker in thickness but smaller in outer diameter than the helical blades at other positions. Further preferably, cutting teeth (not shown in the figure) are arranged on the helical blades at the reduced diameter section 36. It should be noted that generally, qualified biomass particles have a diameter of 6-8 mm and a length of 10-30 mm, however, in actual production, manufacturers of biomass particles do not strictly produce according to the above sizes, and sometimes the size of the biomass particles used is much larger than that of the above qualified biomass particles, which leads to that the biomass particles cannot be fully decomposed after entering the pyrolysis chamber, and at the same time, such large-sized material particles are not conducive to the pre-ignition, affecting the ignition speed; therefore, the reduced diameter section 36 is formed in the middle of the extension direction of the auger sleeve, and the extrusion and cutting crushing of the conveyed biomass particles can be achieved by the reduced diameter, cutting teeth and thicker blades, which is more conducive to ensuring the combustion of the material particles entering the pyrolysis chamber.

[0053] Preferably, the pyrolysis furnace section 1 of the present embodiment is also provided with an ignition gun 16, and the ignition nozzle of the ignition gun 16 is preferably located at the second gap position. By arranging the ignition nozzle at this position, when ignition, the ash removal box 14 can be opened, and the external combustion-supporting gas can enter through the ash removal hole 19 (primary air inlet), at the same time, a part of the combustion-supporting gas from the secondary air duct 10 also reaches this position, when the particles reach the ignition point due to ignition, the particles are quickly ignited, and the temperature in the furnace reaches the pyrolysis combustion effect in a short time. Since the biomass particle fuel has a high volatile content, when the temperature reaches the volatilization temperature of the volatile content and under the condition of reasonable and balanced distribution of primary air, the fuel is quickly ignited and burned, which solves the problem of smoke during the ignition of biomass combustion. When the temperature in the pyrolysis chamber reaches a certain value, the ash removal box 14 can be closed, at this time, since only a small amount of combustion-supporting gas enters the pyrolysis chamber through the second gap, it does not reach the combustion condition, therefore, the biomass fuel in the pyrolysis chamber can only be continuously pyrolyzed under the action of high temperature, and it is almost impossible to form a combustion flame in the pyrolysis chamber, therefore, the coking problem in the pyrolysis chamber is controlled.

[0054] Preferably, the ignition gun 16, the vibration unit 17, the power unit 18, the ash removal box 14 and the auger structure 22 are all located on the same side outside the pyrolysis furnace shell, and are shielded by the protective plate 15, the purpose is to facilitate operation.

[0055] In order to achieve the purpose of the present application, the dust fall chimney structure 4 comprises a bottom plate, an inner shell 261, an outer shell 262, a blocking piece 263, a ring table 264 and blocking pieces 266, wherein the inner shell 261 and the outer shell 262 are fixedly arranged in a ring shape (which can be welded or integrally formed, etc.) on the top surface of the bottom plate, thereby forming a ring-shaped chimney cavity 26 between the inner shell 261 and the outer shell 262, the top of the chimney cavity 26 is covered by the top cover 13, the ring table 264 is formed on the top surface of the bottom plate in the chimney cavity 26, the inner side of the ring table 264 matches the outer side of the inner shell 261 (which can be integrally connected), the outer diameter of the ring table 264 is smaller than the inner diameter of the outer shell 262, thereby forming a ring-shaped groove 265 between the ring table 264 and the outer shell 262, the chimney pipe 12 is bent after passing through the bottom plate from bottom to top, and then passes through the inner shell 261 to communicate with the chimney cavity 26, the outer side of the outer shell 262 is connected with the chimney 6, the inlet of the chimney 6 is staggered with the outlet of the chimney pipe 12 at the inner shell 261 and is blocked by the blocking piece 263 (in this way, the flue gas from the chimney pipe 12 can only move around the chimney cavity 26 until it reaches the inlet of the chimney 6, and cannot directly flow from the outlet of the chimney pipe 12 to the inlet of the chimney 6), and a plurality of blocking pieces 266 with different heights are arranged in the ring-shaped groove 265. Through such arrangement, the flue gas from the chimney pipe 12 can only move around the chimney cavity 26, which generates a certain centrifugal force, and the heavier particles such as soot are thrown outward to the ring-shaped groove 265 on the inner side of the outer shell 262, and are deposited in the ring-shaped groove 265 under the blocking effect of the blocking pieces 266. Due to the blocking of the blocking pieces 266 and the fact that the bottom of the ring-shaped groove 265 is lower than the ring table 264, the deposited particles are difficult to be discharged to the chimney 6, and the lighter gas is discharged from the chimney 6, which can further prevent the discharge of pollutant particles and improve the environmental protection performance.

[0056] Preferably, the blocking piece 263 is arranged in an arc shape near the outlet side of the chimney pipe 12, which facilitates the smooth guiding of the flue gas from the chimney pipe 12 into the chimney cavity 26.

[0057] In order to further improve the processing capacity of the flue gas, an upwardly open container can be selectively placed in the ring-shaped groove 265 between adjacent blocking pieces 266, and chemical substances such as water, sodium carbonate, etc. can be placed in the container as needed. The purpose of this is to further treat the flue gas, for example, biomass fuel is prone to produce a lot of HCl gas after combustion, by placing chemical substances such as sodium carbonate, the emission of HCl gas can be reduced, which is more in line with environmental protection requirements.

[0058] Preferably, the auger structure 22 is arranged in an upwardly inclined manner when entering the pyrolysis furnace section 1. By such arrangement, the material for combustion can only be fed into when the blades of the auger structure 22 are rotating, ensuring the stability and controllability of the feeding, and in addition, when the material for combustion is insufficient, the flame cannot burn downwardly into the auger structure 22.

[0059] Referring to Figure 14 The present application also relates to a pyrolysis combustion furnace system, in use, the pyrolysis combustion furnace of the embodiment is placed in a heat supply chamber 37, the chimney 6 thereof extends out of the heat supply chamber 37 and is discharged to the atmosphere, the heat supply chamber 37 is arranged at one side of a roasting chamber 38, heat transfer is performed between the two through a hot air fan 39, a wind baffle 40 is arranged at the heat supply chamber 37, a dryness and humidity sensor is arranged in the roasting chamber 38, wherein the dryness and humidity sensor, the wind baffle 40, the hot air fan 39, the vibration unit 17 and the power unit 18 are all connected to a PLC controller, the PLC controller adjusts the rotating speed of the hot air fan 39 and the opening degree of the wind baffle 40 according to the temperature and humidity in the roasting chamber 38 detected by the dryness and humidity sensor, controls the combustion of the pyrolysis combustion furnace, and regulates the actions of the vibration unit 17 and the power unit 18.

[0060] Embodiment two

[0061] On the basis of the first embodiment, the present embodiment provides another preferred ash leakage structure 34, which comprises a furnace bridge seat 341, an ash leakage plate 342 and a damping structure 41, wherein the ash leakage plate 342 comprises a disc for ash leakage, a plurality of parallel ash leakage grooves 343 are arranged on the disc, two rotating shafts 3421 are symmetrically arranged on the outer side of the circumference of the disc, the axes of the two rotating shafts 3421 are the same and pass through the center of the disc, two connecting rods 3422 are symmetrically arranged on the outer side of the circumference of the disc, the axes of the two connecting rods 3422 are the same and pass through the center of the disc, the axes of the two connecting rods 3422 are perpendicular to the axes of the two rotating shafts 3421, the ends of the two connecting rods 3422 away from the disc are respectively provided with damping plates 3423, the damping plates 3423 are placed in the damping structure 41, springs 42 are arranged in the damping structure 41 and are respectively located on the upper and lower sides of the damping plates 3423, rotating shaft holes 3412 and vibration limiting grooves 3411 are formed on the furnace bridge seat 341, the two rotating shafts 3421 are respectively arranged in the rotating shaft holes 3412, the disc is placed in the furnace bridge seat 341, the two connecting rods 3422 pass through the vibration limiting grooves 3411 on the furnace bridge seat 341 and are inserted into the damping structure 41 through the damping plates 3423, the damping structure 41 is fixedly installed on the second partition plate 30 (not shown in the figure), and initially, the disc is horizontally placed in the furnace bridge seat 341; the bottom of the ash leakage plate 342 is provided with a vibration rod 35, which also knocks the ash leakage plate 342 by means of the vibration unit 17, and the knocking position of the vibration rod 35 on the ash leakage plate 342 is located on the axes of the two connecting rods 3422. Through the above arrangement, when the ash leakage plate 342 is knocked by the vibration rod 35, referring to Figures 15 to 17 , the ash leakage plate 342 will swing back and forth around the axes of the two rotating shafts 3421, at this time, by means of the action of the damping structure 41, the swinging will be a damping motion, and one knocking can swing several times back and forth, so that the number of knockings can be effectively reduced.

[0062] In addition, it also needs to be explained that the present application is divided into two working modes when the ash leakage plate 342 is knocked by the vibration unit 17, which is controlled by the PLC controller, the first mode is a slight knocking mode, at this time, the main purpose is to flatten the fuel falling above the ash leakage structure, so that the contact area of the fuel and oxygen (which can come from the second gap or the primary air of the ash bucket 14) is increased, so as to achieve the purpose of sufficient pyrolysis; the second mode is a high-frequency and heavy knocking mode, at this time, the main purpose is to reduce the possibility of coking and slagging formed above the ash leakage plate 342, so that the ash particles after combustion can fall down as soon as possible.

[0063] Further, as Figure 15As shown, the extension direction of the ash chute 343 forms an acute angle c with the axis of the two connecting rods 3422, so that when the disc of the ash plate 342 rotates around the two rotating shafts 3421 due to the knocking, since the extension direction of the ash chute 343 is not parallel to the axis of the two connecting rods 3422, the ash on the grate (the blank position between the two adjacent ash chutes 343 in the figure) between the two adjacent ash chutes 343 can also be thrown into the ash chute 343 and fall down, thus improving the ash removal effect. For example, see Figure 7 and 15 If the extension direction of the ash chute 343 on the ash plate 342 is parallel to the axis of the two connecting rods 3422, since the space between the two parallel ash chutes 343 is a grate, if the grate is wide, when the disc of the ash plate 342 rotates around the two rotating shafts 3421, part of the ash on the grate will move back and forth on the grate and cannot fall down, so that it is easy to form ash accumulation and slagging on the grate as the pyrolysis proceeds, and the ash chute 343 will be blocked as the slagging gradually becomes serious. By providing the acute angle c, the ash on the grate is thrown to the adjacent ash chute 343 and falls down, thereby reducing the possibility of ash accumulation and slagging.

[0064] In addition, since the vibration rod 35 is arranged at the bottom of the ash plate 342, when the vibration knocking is performed, the spring 42 on the upper side of the damping plate 3423 is mainly compressed, and the spring 42 on the lower side of 3423 needs to play a certain supporting role in addition to the damping effect, to ensure that the disc is horizontally placed in the grate bridge seat 341 at the beginning (or when not knocking), therefore, in the preferred embodiment, the spring 42 on the lower side of 3423 has a larger elastic coefficient than the spring 42 on the upper side of 3423.

[0065] The above has described various embodiments of the present application, and the above description is exemplary and is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A pyrolysis combustion furnace comprising a pyrolysis furnace section (1), a first combustion furnace section (2), a second combustion furnace section (3), a dust-settling chimney structure (4), a heat dissipation fin (5), a chimney (6), a feeding hopper (7), a secondary air duct (10), a vertical communication pipe (11), a flue pipe (12), and a top cover (13), characterized in that, The pyrolysis furnace section (1), the first combustion furnace section (2), the vertical communication pipe (11), the second combustion furnace section (3), the flue pipe (12), the dust-settling flue structure (4) and the top cover (13) are sequentially connected from bottom to top, the inside of the pyrolysis furnace section (1) forms a pyrolysis chamber, the inside of the first combustion furnace section (2) forms a first combustion cavity (24), the inside of the second combustion furnace section (3) forms a second combustion cavity (25), the inside of the dust-settling flue structure (4) forms a flue cavity (26), the feeding hopper (7) is communicated with the pyrolysis chamber in the pyrolysis furnace section (1) through an auger structure (22) and is used for conveying combustion materials to a position close to the top of the first combustion cavity (24) in the pyrolysis chamber, the pyrolysis chamber, the first combustion cavity (24), the second combustion cavity (25) and the flue cavity (26) are sequentially communicated from bottom to top, the outer periphery of the first combustion furnace section (2), the vertical communication pipe (11), the second combustion furnace section (3), the flue pipe (12) and the dust-settling flue structure (4) are all formed with heat dissipation fins (5), the pyrolysis furnace section (1) is connected with a secondary air flue pipe (10), and the secondary air flue pipe (10) is communicated with the top of the pyrolysis chamber. The pyrolysis furnace section (1) comprises a pyrolysis furnace shell (27), a first partition plate (28), a wind baffle (29), a second partition plate (30), an air inlet pipe (31), a wind baffle plate (32), a dust baffle (33) and a dust leakage structure (34) which are arranged in the pyrolysis furnace shell (27), wherein the first partition plate (28) is located above the second partition plate (30), the secondary air flue pipe (10) is arranged between the first partition plate (28) and the second partition plate (30) and is communicated into the pyrolysis furnace shell (27), a downward flared air inlet pipe (31) is fixedly and connectedly arranged in the middle of the first partition plate (28) and penetrates the first partition plate (28) upward and downward, a plurality of air inlet holes are uniformly arranged on the air inlet pipe (31), a downward flared dust baffle (33) is fixedly and connectedly arranged at the bottom end of the air inlet pipe (31), the dust leakage structure (34) is fixedly and connectedly arranged in the middle of the second partition plate (30), the wind baffle (29) is fixedly arranged on the upper surface of the second partition plate (30) and surrounds the dust leakage structure (34) between the dust leakage structure (34) and the pyrolysis furnace shell (27), the wind baffle plate (32) is fixedly arranged on the outside of the whole formed by the fixed connection of the air inlet pipe (31) and the dust baffle (33), a first gap is formed between the wind baffle plate (32) and the wind baffle (29), a second gap exists between the bottom of the dust baffle (33) and the top of the dust leakage structure (34), the diameter of the bottom of the dust baffle (33) is basically equal to the diameter of the top of the dust leakage structure (34), and the chamber surrounded by the air inlet pipe (31), the dust baffle (33) and the dust leakage structure (34) is the pyrolysis chamber.

2. A pyrolysis combustion furnace as claimed in claim 1, wherein, The auger structure (22) extends into the pyrolysis furnace section (1) in an inclined upward manner.

3. A pyrolysis combustion furnace as claimed in claim 2, wherein, The output end of the auger structure (22) is connected with an inlet hopper (23), the inlet hopper (23) is located in the pyrolysis chamber, the hopper body of the inlet hopper (23) is upwardly open, the connecting end of the inlet hopper (23) and the auger structure (22) is arranged in the direction of the opening end of the inlet hopper (23), the inlet hopper (23) is arranged in an expanding diameter manner, and the opening end of the inlet hopper (23) is formed with a plurality of spring sheet grooves arranged at intervals along the extending direction of the inlet hopper (23), the spring sheet grooves are formed as spring sheet claws by spacing the opening end of the inlet hopper (23), wherein the closer to the middle part of the pyrolysis chamber, the longer the length of the spring sheet groove, the opening end of the inlet hopper (23) is formed with an inclined surface, an included angle b is formed between the inclined surface and the horizontal plane, and the highest point of the inclined surface is located at the middle part of the pyrolysis chamber.

4. A pyrolysis combustion furnace as claimed in claim 3, wherein, The auger structure (22) comprises an auger sleeve and a rotating shaft with spiral blades arranged in the auger sleeve, wherein a reduced diameter section (36) is formed in the middle part of the extending direction of the auger sleeve, the corresponding spiral blade at the reduced diameter section (36) is thicker in thickness but smaller in outer diameter than the spiral blades at other positions, and a cutting tooth is further arranged on the spiral blade at the reduced diameter section (36).

5. A pyrolysis combustion furnace as claimed in claim 1, wherein, The dust falling chimney structure (4) comprises a bottom plate, an inner shell (261), an outer shell (262), a blocking piece (263), a ring table (264) and a blocking sheet (266), wherein the inner shell (261) and the outer shell (262) are arranged in a ring shape on the top surface of the bottom plate, thereby forming a ring-shaped chimney cavity (26) between the inner shell (261) and the outer shell (262), the top of the chimney cavity (26) is capped by a top cover (13), the ring table (264) is formed on the top surface of the bottom plate in the chimney cavity (26), the inner side of the ring table (264) matches the outer side of the inner shell (261), the outer diameter of the ring table (264) is smaller than the inner diameter of the outer shell (262), thereby forming a ring-shaped groove (265) between the ring table (264) and the outer shell (262), the chimney pipe (12) is bent after passing through the bottom plate from bottom to top, and then passes through the inner shell (261) to communicate with the chimney cavity (26), the outer side of the outer shell (262) is connected with a chimney (6), the inlet of the chimney (6) is located opposite to the outlet of the chimney pipe (12) at the inner shell (261) and is blocked by the blocking piece (263), a plurality of blocking sheets (266) with staggered heights are arranged in the ring-shaped groove (265).

6. A pyrolysis combustion furnace as claimed in claim 1, wherein, The ash leakage structure (34) comprises a furnace bridge seat (341) and an ash leakage plate (342) movably arranged in the furnace bridge seat (341), a plurality of strip-shaped ash leakage grooves (343) are formed on the ash leakage plate (342), the furnace bridge seat (341) is in a circular ring structure, and the furnace bridge seat (341) is fixedly arranged in a middle circular hole of the second partition plate (30) through an outer circumference thereof, so that the ash formed by combustion of the material for combustion above the ash leakage plate (342) can be leaked into a collection cavity (20) below the second partition plate (30) through the ash leakage grooves (343), the pyrolysis combustion furnace further comprises a vibration unit (17) and a vibration rod (35), the vibration unit (17) is arranged outside a pyrolysis furnace shell (27), one end of the vibration rod (35) is connected with the vibration unit (17), the other end of the vibration rod (35) extends to a bottom of the ash leakage plate (342) after penetrating through the pyrolysis furnace shell (27), and is used for knocking the ash leakage plate (342) when the vibration unit (17) is in action, wherein the knocking position of the vibration rod (35) on the ash leakage plate (342) is deviated from a central position of the ash leakage plate (342).

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