An emission-reducing and environmentally friendly biomass boiler combustion equipment

Abstract

The present invention discloses an emission-reducing and environmentally friendly biomass boiler combustion equipment, which belongs to the technical field of biomass boilers. It includes a biomass boiler combustion chamber, an exhaust gas treatment module, a heat exchange duct, and a drive module. The output end of the drive module is located at the bottom of the biomass boiler combustion chamber as a whole, and a rotating furnace module that is movably sleeved on the bottom of the biomass boiler combustion chamber is configured on the output end. The surrounding scattering design realizes the surrounding scattering of limestone powder in the combustion chamber. It can be distributed more evenly in the combustion chamber. Because the limestone powder is finely dispersed, the chance of contact with the acidic gas generated during the combustion process is greatly increased, thereby significantly improving the desulfurization efficiency. In addition, this uniform distribution not only helps to reduce the emission concentration of sulfur dioxide, but also effectively reduces the generation of other harmful gases such as nitrogen oxides, and further improves the quality of exhaust gas emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass boilers, and more specifically to an emission-reducing and environmentally friendly biomass boiler combustion device. Background Art

[0002] In the modern industrial field, biomass boiler combustion equipment, as an efficient and environmentally friendly energy conversion device, is gradually becoming an ideal substitute for traditional fossil fuel boilers. The core of the biomass boiler lies in its furnace design. For the boiler with a cylindrical furnace structure, it not only has good pressure resistance and uniform temperature distribution, but also ensures that the fuel and air are fully mixed to improve the combustion efficiency.

[0003] In order to further improve the emission reduction and environmental protection performance of biomass boilers with cylindrical furnace structures, the existing technology will reduce the water content of fuel through pretreatment when processing biomass fuels with high ash content, and adopt appropriate feeding methods to ensure that the fuel fully releases energy during the combustion process and reduce the generation of unburned substances. However, even so, some biomass fuels will still produce acidic gases such as sulfur dioxide and hydrogen chloride during the combustion process, which poses a potential threat to the environment. Therefore, limestone powder is introduced as an auxiliary material during the combustion process of biomass boilers to cause the acidic gases generated in the furnace to undergo chemical reactions to form stable compounds, thereby effectively reducing the emission of acidic gases.

[0004] However, in the actual production line, the process of adding limestone powder faces several challenges. First, although the method of directly injecting it into the furnace is simple and quick to react, long-term use may cause increased wear of the equipment; second, if the injection position remains unchanged, it may cause uneven distribution of limestone powder, which not only affects the desulfurization effect, but also may cause excessive acid gas emissions in local areas, making it difficult to meet the increasingly stringent environmental emission standards, weakening the emission reduction and environmental protection goals originally intended to be achieved by biomass boiler combustion equipment, and may also have a negative impact on the environment. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide an emission-reducing and environmentally friendly biomass boiler combustion equipment, aiming to solve the above-mentioned technical problems.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A biomass boiler combustion device for emission reduction and environmental protection, comprising a biomass boiler combustion chamber, a corresponding exhaust gas treatment module is fixedly installed on the top of the biomass boiler combustion chamber, and a heat exchange conduit with one inlet and one outlet is fixedly installed in the exhaust gas treatment module, a driving module is arranged on the outer surface of the biomass boiler combustion chamber, the output end of the driving module is located at the bottom of the biomass boiler combustion chamber as a whole, and a rotating furnace module movably sleeved on the bottom of the biomass boiler combustion chamber is arranged on the output end;

[0008] The combustion chamber of the biomass boiler is also provided with a heat exchange module connected to the heat exchange conduit, and the rotary furnace module includes a bottom sleeve with a circular notch fixedly connected to the bottom of the combustion chamber of the biomass boiler, and the bottom of the bottom sleeve with a circular notch is movably clamped by the notch of the inner circle to hold a tray cylindrical cover, and biofuel is placed inside the tray cylindrical cover to heat the heat exchange module;

[0009] Among them, the surface of the tray cylindrical cover is configured with a scattering mechanism which is integrally sleeved on the outside of the heat exchange module, and the scattering mechanism includes a plurality of groups of ash storage units and a biomass auxiliary material annular storage box fixedly installed on the outer edge of the exhaust gas treatment module, and each group of ash storage units is communicated with the biomass auxiliary material annular storage box, and through the driving action of the driving module, the limestone powder in each group of ash storage units can be scattered into the combustion end in a circular manner while the biomass fuel inside the tray cylindrical cover is stirred.

[0010] As a further solution of the present invention: the heat exchange module includes a heating hood fixedly connected to the inner center position of the biomass boiler combustion chamber, the bottom of the heating hood is a hemispherical structure, and there is a cavity structure between the outer surface of the heating hood and the inner wall of the biomass boiler combustion chamber, the interior of the heating hood is fixedly installed with a threaded coil connected to the heat exchange conduit, the upper side of the heating hood is fixedly installed with a clamping circular ring plate connected to the bottom of the biomass auxiliary material circular storage box, and the surface of the clamping circular ring plate is circumferentially opened with a plurality of second leakage holes connected to the biomass auxiliary material circular storage box, and the lower side of the heating hood is located at the intersection with the hemispherical bottom and a circular ring frame with a protrusion is fixedly installed.

[0011] As a further solution of the present invention: the driving module includes a detachable auxiliary bracket inserted and installed on the outer side of the biomass boiler combustion bin, and one end of the detachable auxiliary bracket away from the biomass boiler combustion bin extends to the bottom of the biomass boiler combustion bin, and a servo motor is fixedly installed on the end extending to the bottom of the biomass boiler combustion bin, and the output end of the servo motor is fixedly connected to an electric telescopic rod.

[0012] As a further solution of the present invention: a plurality of threaded sockets are provided at the bottom edge of the tray cylindrical cover, and an ash collecting cylinder is installed at the bottom of the tray cylindrical cover by arranging bolts through the threaded sockets, the telescopic end of the electric telescopic rod is fixedly installed at the center of the bottom of the ash collecting cylinder by bolts, a leakage base communicating with the ash collecting cylinder is fixedly installed on the bottom surface of the tray cylindrical cover, a feeding pipe for injecting biomass fuel into the tray cylindrical cover is fixedly connected to the outer side surface of the biomass boiler combustion bin, and the biomass boiler combustion bin and the bottom sleeve with a circular groove are an integrated structure.

[0013] As a further solution of the present invention: a plurality of first leakage holes are opened in a circular manner from top to bottom on the outer surface of the heating hood, the inner bottom of the biomass auxiliary material ring storage box is a bevel structure facing the second leakage holes, and a sealing cover is arranged on the outer side of the biomass auxiliary material ring storage box, the circular ring frame with protrusions is a circular ring structure with a plurality of circular protrusions arranged at the outer edge position as a whole, and a gear circular ring sleeve is also fixedly installed on the inner wall of the biomass boiler combustion chamber, and a tooth opening is opened on the inner circular ring edge of the gear circular ring sleeve.

[0014] As a further solution of the present invention: the scattering mechanism also includes a multi-row gear rod sleeve fixedly installed at the middle position of the upper surface of the leakage base, a semi-circular arc bracket is fixedly connected to the upper side of the multi-row gear rod sleeve, a first scraper plate that fits the hemispherical structure at the bottom of the heating hood is fixedly installed on the inner ring of the semi-circular arc bracket, a group of vertical auxiliary plates flush with the heating hood are fixedly connected at the two side ends of the upper surface of the semi-circular arc bracket, and a first scraper plate that fits the outer side of the heating hood is also fixedly installed on the side of the vertical auxiliary plate facing the heating hood, a first arc sleeve frame is fixedly connected at the hinge position of the semi-circular arc bracket and the vertical auxiliary plate, and the first arc sleeve frame is located as a whole on the outside of the heating hood.

[0015] As a further scheme of the present invention: the ash storage units are arranged in a circular manner on the first arc sleeve frame in sequence, and each ash storage unit includes an L-shaped discharge pipe fixedly connected to the edge of the first arc sleeve frame, and an inner opening is opened inside the L-shaped discharge pipe, and a third sleeve is fixedly connected to the side of the outer side of the L-shaped discharge pipe that is flush with the heating hood, and a semicircular reserved cavity is fixedly connected to the side of the outer side of the L-shaped discharge pipe that is flush with the surface of the leakage base, and the semicircular reserved cavity is located on the upper side of the inner opening, and a limiting slot is opened between the semicircular reserved cavity and the inner opening, and a plurality of spring return rods are fixedly installed inside the semicircular reserved cavity, and a bow-shaped cover plate that slides in the limiting slot is fixedly installed on the protruding end of the spring return rod, and a clamping plate is fixedly connected to both side ends of the bow-shaped cover plate, and slots for the clamping plate to engage are opened on both sides of the inner side of the semicircular reserved cavity.

[0016] As a further solution of the present invention: the bow-shaped cover plate extends into the inner opening through a limiting groove, and a trigger head and an extension rod are fixedly connected to the bow-shaped cover plate extending on one side of the inner opening, one in front and one in the back, respectively. The trigger head extends out of one side of the L-shaped discharge pipe as a whole, and is tightly attached to the circular ring of the circular ring frame with a protrusion, and the direction of the extension rod is opposite to that of the trigger head. A bottom plate cover is fixedly connected to the side of the L-shaped discharge pipe opposite to the semicircular reserved cavity, and a plurality of ash discharge grooves are provided on the bottom plate cover. An arc-shaped scraper plate that fits the bottom plate cover is fixedly installed on the outer protruding end of the extension rod, and a second scraper plate is also fixedly installed on the outer rod surface of the extension rod, and the bottom of the second scraper plate is also fitted with the bottom plate cover.

[0017] As a further solution of the present invention: a concave socket tube is provided on the upper circular ring edge of the third sleeve, and the first sleeve is movably inserted and installed through the concave socket tube, and the bottom of the first sleeve is fixedly connected with a convex socket tube corresponding to the concave socket tube at one end of the third sleeve, a convex socket tube is also fixedly installed on the upper side of the first sleeve, and a second sleeve is movably inserted and installed through the convex socket tube on the upper side, the bottom of the second sleeve is also provided with a concave socket tube corresponding to the convex socket tube on the upper side of the first sleeve, and a gear sleeve block is fixedly installed on the outer surface of the first sleeve, and the gear sleeve blocks are meshed with the gear ring sleeve on the inner wall of the biomass boiler combustion chamber.

[0018] As a further solution of the present invention: the interior of the first sleeve is fixedly connected with an impeller rod, and the two sides of the impeller rod extend into the second sleeve and the third sleeve respectively, a second circular arc sleeve frame is fixedly installed on the upper side of the second sleeve, and a transfer module is fixedly installed on the upper side of the second circular arc sleeve frame, the transfer module includes a circular clamping cavity movably sleeved in the clamping of the clamping circular ring plate, the interior of the circular clamping cavity is provided with an oblique opening corresponding to each second sleeve, and each oblique opening is provided with a reserved circular opening communicated with the second sleeve on the same side, and each impeller rod extending in the second sleeve extends into the oblique opening through the reserved circular opening, and a stirring plate is fixedly installed on the impeller rod extending into the oblique opening.

[0019] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0020] The design of surrounding scattering enables the surrounding scattering of limestone powder in the combustion chamber. Compared with the traditional direct injection method, this design ensures that the limestone powder can be more evenly distributed in the combustion chamber. Since the limestone powder is finely dispersed, its chance of contact with the acidic gas generated during the combustion process is greatly increased, thereby significantly improving the desulfurization efficiency. In addition, this uniform distribution not only helps to reduce the emission concentration of sulfur dioxide, but also effectively reduces the generation of other harmful gases such as nitrogen oxides, further improving the quality of exhaust gas emissions.

[0021] Through the rotating furnace module, the biomass fuel is continuously stirred during the combustion process, and the limestone powder is simultaneously scattered in a circular manner. This not only promotes the full mixing of the biomass fuel and the air, ensuring a more complete combustion process, but also increases the time and opportunity for the limestone powder to contact the acidic components in the flue gas, thereby enhancing the efficiency of the chemical reaction. At the same time, through the optimized heat exchange module design, the heat generated by the combustion can be more efficiently transferred to the water or other heat transfer medium in the heat exchange conduit, generating steam or hot water for heating or power generation, thereby improving the overall energy utilization and thermal efficiency.

[0022] Through the surrounding scattering technology, by controlling the scattering angle and speed of the powder, the powder is prevented from directly hitting the inner wall of the furnace, reducing the risk of equipment wear. In addition, the automatic cleaning function can clean the dust accumulation on the surface of key components during operation to prevent slagging, thereby extending the service life of the equipment and reducing maintenance costs. This series of improvement measures work together to make the entire system more reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a side view of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a biomass boiler combustion chamber in a semi-section state of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a semi-sectioned state of a tray cylindrical cover of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the heat exchange module of the present invention in a disassembled state;

[0029] Figure 6 It is a structural schematic diagram of a biomass auxiliary material annular storage box in a half-section state of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the scattering mechanism of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the transfer module of the present invention;

[0032] Fig. 9It is a schematic diagram of the partial structure of the ash storage unit of the present invention;

[0033] Fig.10 It is a schematic diagram of the structure of the first sleeve of the present invention in a half-section view and in a disassembled state;

[0034] Fig.11 It is a schematic diagram of the resetting effect of the L-shaped discharge pipe of the present invention in a half-section state.

[0035] Reference numerals

[0036] 1. Biomass boiler combustion chamber; 2. Exhaust gas treatment module; 3. Heat exchange duct;

[0037] 4. Driving module; 41. Removable auxiliary bracket; 42. Servo motor; 43. Electric telescopic rod;

[0038] 5. Rotating furnace module; 51. Bottom sleeve with circular notch; 52. Tray cylinder cover; 53. Leakage base; 54. Threaded sleeve; 55. Ash receiving cylinder;

[0039] 6. heat exchange module; 61. heating cover; 62. first leakage hole; 63. threaded coil; 64. clamping ring plate; 65. second leakage hole; 66. ring frame with protrusions;

[0040] 7. Biomass auxiliary material ring storage box; 8. Gear ring sleeve;

[0041] 9. Spreading mechanism; 91. Multi-row gear rod sleeve; 92. Semicircular arc bracket; 93. First circular arc sleeve bracket; 94. Vertical auxiliary plate; 95. First scraping plate;

[0042] 96, ash storage unit; 961, first sleeve; 962, convex socket cylinder; 963, second sleeve; 964, third sleeve; 965, concave socket cylinder; 966, gear sleeve; 967, impeller rod; 968, stirring plate; 969, L-shaped discharge pipe; 9610, inner opening; 9611, semicircular reserved cavity; 9612, spring return rod; 9613, limit notch; 9614, bow cover plate; 9615, card plate; 9616, trigger head; 9617, extension rod; 9618, second scraper plate; 9619, bottom plate cover; 9620, ash discharge notch; 9621, arc scraper;

[0043] 97. Second arc sleeve;

[0044] 98. Transfer module; 981. Circular clamp cavity; 982. Oblique opening; 983. Reserved circular opening.

[0045] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0046] The following is a detailed description of an emission reduction and environmentally friendly biomass boiler combustion device provided by the present invention in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are listed as the best and preferred embodiments, and other alternatives can also be used by technicians in some known technical fields; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0047] like Figures 1 to 11 As shown, an embodiment of the present invention provides an emission reduction and environmentally friendly biomass boiler combustion device, including a biomass boiler combustion chamber 1, a corresponding exhaust gas treatment module 2 is fixedly installed on the top of the biomass boiler combustion chamber 1, and a heat exchange conduit 3 with one inlet and one outlet is fixedly installed in the exhaust gas treatment module 2, and a driving module 4 is arranged on the outer surface of the biomass boiler combustion chamber 1, and the output end of the driving module 4 is located at the bottom of the biomass boiler combustion chamber 1 as a whole, and a rotating furnace module 5 that is movably sleeved in the bottom of the biomass boiler combustion chamber 1 is arranged on the output end;

[0048] The biomass boiler combustion chamber 1 is further provided with a heat exchange module 6 connected to the heat exchange conduit 3. The rotary furnace module 5 includes a bottom sleeve 51 with a circular notch fixedly connected to the bottom of the biomass boiler combustion chamber 1. The bottom of the bottom sleeve 51 with a circular notch is movably clamped with a tray cylindrical cover 52 through the notch of the inner circle. Biofuel is placed inside the tray cylindrical cover 52 to heat the heat exchange module 6.

[0049] Among them, the surface of the tray cylindrical cover 52 is configured with a scattering mechanism 9 which is integrally sleeved on the outside of the heat exchange module 6, and the scattering mechanism 9 includes a plurality of groups of ash storage units 96 and a biomass auxiliary material annular storage box 7 fixedly installed on the outer edge of the exhaust gas treatment module 2, and each group of ash storage units 96 is communicated with the biomass auxiliary material annular storage box 7. Through the driving action of the driving module 4, the limestone powder in each group of ash storage units 96 can be scattered in a circular manner into the combustion end while the biomass fuel inside the tray cylindrical cover 52 is stirred.

[0050] In order to solve the problems of equipment wear and uneven desulfurization caused by direct injection and fixed injection position of existing limestone powder in actual production line, the above technical scheme is adopted to solve the problem. The above technical scheme mainly consists of biomass boiler combustion chamber 1, tail gas treatment module 2, heat exchange conduit 3, drive module 4, rotary furnace module 5, heat exchange module 6, biomass auxiliary material annular storage box 7, and throwing mechanism 9. The biomass boiler combustion chamber 1 is used as the combustion chamber of the device, which is a high-strength burning-resistant material of biomass in the prior art, and the tail gas treatment module 2 configured on the outside is a The tail gas treatment facilities include but are not limited to cyclone separators, electrostatic precipitators, bag filters, and desulfurization and denitrification devices, etc., which are used to reduce the concentration of particulate matter and other pollutants in the emissions and purify the pollutants generated in the rotary furnace module 5, which is a prior art, and the heat exchange conduit 3 configured on the tail gas treatment module 2 is a conduit for injecting clean water, one in and one out to utilize heat energy, which is also a prior art, and the configured drive module 4 is an external motor drive structure in the prior art, which is used to drive the rotary furnace module 5 at the output end to rotate at the bottom of the biomass boiler combustion bin 1;

[0051] The rotary furnace module 5 includes a bottom sleeve 51 with a circular notch fixedly connected to the bottom of the biomass boiler combustion chamber 1, and a tray cylindrical cover 52 movably installed at the bottom of the bottom sleeve 51 with a circular notch. The tray cylindrical cover 52 is used to place biomass fuel, belongs to the furnace in the prior art, is the place where biomass fuel is burned, and is made of high-temperature resistant materials. The heat exchange module 6 is arranged as a whole inside the biomass boiler combustion chamber 1. During the combustion of biomass materials inside the tray cylindrical cover 52, the heat exchange module 6 is heated, so that the conduit of the heat exchange conduit 3 inside the heat exchange module 6 is heated to perform heat exchange, that is, the heat generated by the combustion is exchanged. The heat is transferred to the water or other heat transfer medium in the conduit in a manner to generate steam or hot water for heating or power generation. The purpose of the rotary combustion through the configured drive module 4 is to improve the fluidity of the combustion end, so that the fuel and air are more fully mixed, ensuring a more complete combustion process, thereby improving energy utilization and thermal efficiency. Fluidity combustion helps to evenly distribute heat in the furnace, reduce local overheating or cooling, extend the service life of the equipment, and reduce the risk of slagging. In addition, for the addition of auxiliary materials such as limestone powder, the rotary combustion can promote better contact between the limestone powder and the acidic components in the flue gas, increase the chance of chemical reaction, and thus improve the desulfurization efficiency.

[0052] The configured throwing mechanism 9 includes a plurality of groups of ash storage units 96 and a biomass auxiliary material annular storage box 7 fixedly mounted on the outer edge of the tail gas treatment module 2. Each group of ash storage units 96 is connected to the biomass auxiliary material annular storage box 7 to form a complete material conveying system. Through the action of the driving module 4, not only can the cylindrical cover 52 of the stirring tray be effectively stirred, but also the limestone powder in each group of ash storage units 96 can be thrown into the combustion end in a circular manner while the biomass fuel inside the cylindrical cover 52 of the stirring tray is stirred, thereby improving the desulfurization efficiency.

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 6 As shown, the heat exchange module 6 includes a heating hood 61 fixedly connected to the inner center position of the biomass boiler combustion chamber 1, the bottom of the heating hood 61 is a hemispherical structure, and there is a cavity structure between the outer surface of the heating hood 61 and the inner wall of the biomass boiler combustion chamber 1, the interior of the heating hood 61 is fixedly installed with a threaded coil 63 connected to the heat exchange conduit 3, the upper side of the heating hood 61 is fixedly installed with a clamping ring plate 64 connected to the bottom of the biomass auxiliary material ring storage box 7, and the surface of the clamping ring plate 64 is circumferentially opened with a plurality of second leakage holes 65 connected to the biomass auxiliary material ring storage box 7, and the lower side of the heating hood 61 is located at the junction with the hemispherical bottom and a ring frame 66 with a protrusion is fixedly installed.

[0054] Among them, the interior of the configured biomass auxiliary material annular storage box 7 is used to store limestone powder, and the bottom of the heating hood 61 is set to a hemispherical structure to allow the internal flue gas impurities to be discharged more smoothly, and the threaded coil 63 is an integrated structure connected to the heat exchange conduit 3, and the path of the conduit is specifically through the heat exchange conduit 3 introduced from the outside to the threaded coil 63, and after rotating several times, it passes through one end of the exhaust gas treatment module 2, so that cold water and then hot water can be discharged for heat exchange.

[0055] like Figure 1 , Figure 2 As shown, the driving module 4 includes a detachable auxiliary bracket 41 inserted and installed on the outer side of the biomass boiler combustion chamber 1, and one end of the detachable auxiliary bracket 41 away from the biomass boiler combustion chamber 1 extends to the bottom of the biomass boiler combustion chamber 1, and a servo motor 42 is fixedly installed on the end extending to the bottom of the biomass boiler combustion chamber 1, and the output end of the servo motor 42 is fixedly connected to an electric telescopic rod 43.

[0056] Among them, the configured detachable auxiliary bracket 41 is a detachable bracket structure of the upper and lower plug-in type in the prior art. The purpose of ensuring that it can be disassembled is to allow the servo motor 42 to be disassembled later, and then the components at the output end of the servo motor 42 to be disassembled for dust removal and daily maintenance. Correspondingly, in order to better disassemble, the output end of the driving end is provided with an electric telescopic rod 43 that can be extended up and down to ensure that the upper and lower ends can give way during the disassembly process.

[0057] like Figure 3 , Figure 4 , Figure 5 As shown, a plurality of threaded sockets 54 are provided at the bottom edge of the tray cylindrical cover 52, and an ash receiving cylinder 55 is installed at the bottom of the tray cylindrical cover 52 by bolts arranged through the threaded sockets 54, the telescopic end of the electric telescopic rod 43 is fixedly installed at the center of the bottom of the ash receiving cylinder 55 by bolts, and a leakage base 53 communicating with the ash receiving cylinder 55 is fixedly installed on the bottom surface of the tray cylindrical cover 52, and a feeding pipe for injecting biomass fuel into the tray cylindrical cover 52 is fixedly connected to the outer side surface of the biomass boiler combustion bin 1, and the biomass boiler combustion bin 1 and the bottom sleeve 51 with a circular groove are an integral structure.

[0058] The dust collecting cylinder 55 is installed and fixed by assembling bolts on a plurality of threaded sleeves 54, and the dust collecting cylinder 55 is configured as a detachable structure in order to cooperate with the electric telescopic rod 43 that can be extended up and down to complete the disassembly of the bottom.

[0059] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a plurality of first leakage holes 62 are opened in a circular manner from top to bottom on the outer surface of the heating cover 61, the inner bottom of the biomass auxiliary material annular storage box 7 is a bevel structure facing the second leakage hole 65, and a sealing cover is arranged on the outer side of the biomass auxiliary material annular storage box 7, the annular frame 66 with protrusions is an annular structure with a plurality of circular protrusions arranged at the outer edge position as a whole, and a gear annular sleeve 8 is also fixedly installed on the inner wall of the biomass boiler combustion chamber 1, and a tooth opening is opened on the inner ring edge of the gear annular sleeve 8.

[0060] Among them, the first leakage holes 62 are configured to allow heat and high-temperature smoke to better enter the interior of the heating cover 61 to heat the threaded coil 63 structure inside the heating cover 61;

[0061] The specific heat exchange process for the heat exchange module 6 is:

[0062] First, open the sealing cover configured on the biomass auxiliary material annular storage box 7, and inject the auxiliary material limestone powder into the interior of the biomass auxiliary material annular storage box 7. Different from the traditional one-time addition, it is first stored in the external biomass auxiliary material annular storage box 7, and is added in real time when it is used later. The cold water is introduced into the threaded coil 63 through the heat exchange conduit 3 outside the tail gas treatment module 2;

[0063] Then, biomass fuel is injected into the tray cylindrical cover 52 through the feeding pipe on the outer side of the biomass boiler combustion bin 1, and the fuel inside the tray cylindrical cover 52 is clamped and burned. During the combustion process, the ash receiving cylinder 55 at the output end can be controlled to rotate by the servo motor 42 on the outer side of the detachable auxiliary bracket 41. Since the ash receiving cylinder 55 and the tray cylindrical cover 52 are fixed by bolts at the threaded sleeve 54, the synchronous tray cylindrical cover 52 will also rotate in the bottom sleeve 51 with annular grooves at the bottom of the biomass boiler combustion bin 1. Its rotation can improve the fluidity of the internal fuel and ensure sufficient combustion on the one hand, and on the other hand, it drives the scattering mechanism 9 to rotate and scatter limestone powder;

[0064] Finally, the water in the heated threaded coil 63 is discharged again through the heat exchange conduit 3 to achieve a reciprocating working state, and the biomass fuel burning in the tray cylinder cover 52 also enters the ash receiving cylinder 55 through the leakage base 53 at the bottom under the action of rotation, waiting for subsequent centralized maintenance and cleaning.

[0065] like Figure 3 , Figure 4 , Figure 7 , Figure 8 As shown, the scattering mechanism 9 also includes a multi-row gear rod sleeve 91 fixedly installed at the middle position of the upper surface of the leakage base 53, and a semi-circular arc bracket 92 is fixedly connected to the upper side of the multi-row gear rod sleeve 91. A first scraper plate 95 that fits the hemispherical structure at the bottom of the heating cover 61 is fixedly installed on the inner ring of the semi-circular arc bracket 92. A group of vertical auxiliary plates 94 flush with the heating cover 61 are fixedly connected at the two side ends of the upper surface of the semi-circular arc bracket 92, and the side of the vertical auxiliary plate 94 facing the heating cover 61 is also fixedly installed with a first scraper plate 95 that fits the outer side of the heating cover 61. The first arc sleeve frame 93 is fixedly connected at the hinge position of the semi-circular arc bracket 92 and the vertical auxiliary plate 94, and the first arc sleeve frame 93 is located on the outside of the heating cover 61 as a whole.

[0066] Among them, the multi-row gear rod sleeve 91 is used to lift the semi-circular arc bracket 92 as a bracket on the one hand, and on the other hand, it is directly arranged on the upper surface of the leakage base 53, so it also plays a stirring role. Although the two structures rotate synchronously, they can also achieve a separation effect during the rotation process, which is convenient for the export of burnt materials. The semi-circular arc bracket 92 is a semi-circular arc bracket structure as the name implies, which is used to be sleeved on the bottom of the heating hood 61. It is an integral structure with the vertical auxiliary plates 94 on both sides. The first scraper plate 95 arranged on the inner side is a high-strength burn-resistant structure that has a scraping effect. During the rotation process, since the heating hood 61 is stationary, the outer surface of the heating hood 61 can be scraped and the leakage on the outer surface of the heating hood 61 can be cleaned simultaneously. The first arc sleeve 93 at the intersection position plays a supporting role for the ash storage unit 96.

[0067] like Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the ash storage units 96 are sequentially arranged on the first arc sleeve 93 in a circular manner, and each ash storage unit 96 includes an L-shaped discharge pipe 969 fixedly connected to the edge of the first arc sleeve 93, and an inner opening 9610 is opened inside the L-shaped discharge pipe 969. The outer side of the L-shaped discharge pipe 969 that is flush with the heating cover 61 is fixedly connected to the third sleeve 964, and the outer side of the L-shaped discharge pipe 969 that is flush with the surface of the leakage base 53 is fixedly connected to a semicircular reserved cavity 9611, and the semicircular reserved cavity 9611 is located at On the upper side of the inner through opening 9610, a limiting slot 9613 is provided between the semicircular reserved cavity 9611 and the inner through opening 9610, a plurality of spring return rods 9612 are fixedly installed inside the semicircular reserved cavity 9611, a bow-shaped cover plate 9614 which is slidably sleeved in the limiting slot 9613 is fixedly installed on the protruding end of the spring return rod 9612, and both side ends of the bow-shaped cover plate 9614 are fixedly connected with a clamping plate 9615, and slots for the clamping plate 9615 to engage are provided on both sides of the interior of the semicircular reserved cavity 9611.

[0068] The configured L-shaped discharge pipe 969 is L-shaped as a whole, and the side of the outer side of the L-shaped discharge pipe 969 that is flush with the heating cover 61 is fixedly connected to the third sleeve 964, and the side of the outer side of the L-shaped discharge pipe 969 that is flush with the surface of the leakage base 53 is fixedly connected to a semicircular reserved cavity 9611, and the configured spring reset rod 9612 will make the outer trigger head 9616 pop outward under the elastic reset action when there is no external force pressure, and the so-called semicircular reserved cavity 9611 is set on the L-shaped discharge pipe. A semicircular cavity above the inner opening 9610 on the outer side of the material tube 969 is mainly used to configure a plurality of spring return rods 9612 so that the spring return rods 9612 do not interfere with the material in the inner opening 9610. The so-called bow cover plate 9614 is a semicircular plate structure. The clamping plates 9615 on both sides are slidably engaged with the engaging grooves opened on both sides of the semicircular reserved cavity 9611. The clamping on both sides is set to make the bow cover plate 9614 smoother in the process of sliding back and forth.

[0069] like Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the bow-shaped cover plate 9614 extends into the inner opening 9610 through the limiting slot 9613, and a trigger head 9616 and an extension rod 9617 are fixedly connected to the bow-shaped cover plate 9614 extending into one side of the inner opening 9610, one in front and one in the back, respectively. The trigger head 9616 extends out of one side of the L-shaped discharge pipe 969 as a whole, and is tightly attached to the ring of the ring frame 66 with a protrusion, while the extension rod 9617 is oriented opposite to the trigger head 9616. A bottom plate cover 9619 is fixedly connected to the side of 969 opposite to the semicircular reserved cavity 9611, and a plurality of ash outlet slots 9620 are opened on the bottom plate cover 9619. An arc-shaped scraper 9621 that fits with the bottom plate cover 9619 is fixedly installed on the outer protruding end of the extension rod 9617. A second scraper plate 9618 is also fixedly installed on the outer rod surface of the extension rod 9617, and the bottom of the second scraper plate 9618 is also in contact with the bottom plate cover 9619.

[0070] The outer side of the trigger head 9616 is a spherical structure, and the spherical structure is set so that the trigger head 9616 can be better squeezed by the bumps on the ring frame 66 with bumps during the rotation process, and the trigger head 9616 squeezed by the bumps will move the extension rod 9617 inward, that is, drive the arc scraper 9621 on the extension rod 9617 to move inwardly of the inner opening 9610, and because the ring frame 66 with bumps is equipped with a plurality of bumps, the arc scraper 9621 will be pushed back and forth multiple times during the rotation process. 21 moves to scrape out the powder on the inner side of the inner opening 9610 reciprocatingly, and the configured second scraper plate 9618 is shown in the figure. A scraping end is provided on one end thereof which is in contact with the bottom plate cover 9619. When the trigger head 9616 is not squeezed by external force, it is just located on the ash outlet slot 9620 on the surface of the bottom plate cover 9619, blocking the ash outlet slot 9620, that is, the powder is not discharged, but the powder is discharged in the rotating state. Furthermore, the ash outlet slot 9620 can be cleaned in the process of reciprocating pushing to ensure the flow of the leak.

[0071] like Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, a concave socket tube 965 is provided on the upper circular ring edge of the third sleeve 964, and the first sleeve 961 is movably inserted and installed through the concave socket tube 965, and the bottom of the first sleeve 961 is fixedly connected with a convex socket tube 962 corresponding to the concave socket tube 965 at one end of the third sleeve 964, and a convex socket tube 962 is also fixedly installed on the upper side of the first sleeve 961, and a second sleeve 963 is movably inserted and installed through the convex socket tube 962 on the upper side, and the bottom of the second sleeve 963 is also provided with a concave socket tube 965 corresponding to the convex socket tube 962 on the upper side of the first sleeve 961, and a gear sleeve block 966 is fixedly installed on the outer surface of the first sleeve 961, and the gear sleeve block 966 is meshed with the gear ring sleeve 8 on the inner wall of the biomass boiler combustion chamber 1.

[0072] Among them, the configured first sleeve 961, second sleeve 963, and third sleeve 964 are actually independent of each other, and are only movably fitted together through the convex socket tube 962 and the concave socket tube 965 at the interface position. Since the second sleeve 963 and the third sleeve 964 are fixed on the outside, only the middle first sleeve 961 is in a relatively active state during the rotation. Precisely because of the characteristics of the movable connection, it can be driven by the fixed gear ring sleeve 8 to enable each individual first sleeve 961 to complete self-rotation during the overall rotation. The self-rotation of the first sleeve 961 can, on the one hand, cooperate with the internal impeller rod 967 to stably transport the powder material, and on the other hand, it can also enable the stirring plate 968 outside the impeller rod 967 to rotate in the inclined warehouse 982. By rotating the entire conveying path of the powder, the powder in the conveying state can be made to flow, on the one hand to avoid caking and blocking the conveying end, and on the other hand to make it loose enough.

[0073] like Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the interior of the first sleeve 961 is fixedly connected with an impeller rod 967, and the two sides of the impeller rod 967 extend into the second sleeve 963 and the third sleeve 964 respectively, and the second circular arc sleeve frame 97 is fixedly installed on the upper side of the second sleeve 963, and the transfer module 98 is fixedly installed on the upper side of the second circular arc sleeve frame 97, and the transfer module 98 includes a circular clamping cavity 981 that is movably sleeved in the clamping of the clamping circular ring plate 64, and the interior of the circular clamping cavity 981 is provided with an oblique opening 982 corresponding to each second sleeve 963, and each oblique opening 982 is provided with a reserved circular opening 983 that communicates with the second sleeve 963 on the same side, and each impeller rod 967 extending in the second sleeve 963 extends into the oblique opening 982 through the reserved circular opening 983, and a stirring plate 968 is fixedly installed on the impeller rod 967 extending into the oblique opening 982.

[0074] The specific working state of the configured ash storage unit 96 is:

[0075] First, when the tray cylindrical cover 52 in the combustion chamber 1 of the biomass boiler cooperates with the biomass fuel to generate heat, the rotating furnace module 5 at the output end can be rotated by controlling the driving module 4. In this rotating state, since the multi-row gear rod sleeve 91 is fixed to the leak base 53, the first arc sleeve frame 93 at one end of the multi-row gear rod sleeve 91 will also rotate synchronously;

[0076] Then, the ash storage unit 96 arranged on the first arc sleeve frame 93 can rotate synchronously. During the rotation process, the upper and lower ends of the first sleeve 961 will perform different tasks respectively. For the upper side of the first sleeve 961, that is, the side of the second sleeve 963, the gear sleeve block 966 driven by the gear ring sleeve 8 will make the first sleeve 961 and the impeller rod 967 inside the first sleeve 961 rotate, and the stirring plate 968 on the upper side of the impeller rod 967 will rotate in the oblique warehouse opening 982 on the same side, so that the powder leaked from the second leakage hole 65 at the bottom of the biomass auxiliary material annular storage box 7 into the oblique warehouse opening 982 flows and better enters the bottom of the first sleeve 961, that is, the third sleeve 964 and the L-shaped discharge pipe 969, that is, enters the inner opening 9610;

[0077] Then, after the stably transported powder enters the inner opening 9610 at the bottom, similarly, during the rotation of the bottom, the trigger head 9616 extended by the spring return rod 9612 will also be reciprocated and squeezed by the protrusion of the protruding ring frame 66, so that the trigger head 9616 is pushed inward, and the reciprocating control arc scraper 9621 stably brings the powder at the bottom to the side of the ash outlet slot 9620 of the bottom plate cover 9619, and the whole is rotating, so the overall state of the powder is to surround the outer surface of the heating cover 61 and throw it to the side of the tray cylindrical cover 52, which is different from the traditional throwing of limestone powder, and it can ensure that the limestone powder is more evenly distributed in the combustion chamber. This uniform distribution helps to improve the contact efficiency between the desulfurizer and the acid gas, thereby more effectively reducing harmful gas emissions.

[0078] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An emission reduction and environmentally friendly biomass boiler combustion device, comprising a biomass boiler combustion chamber (1), characterized in that: A corresponding tail gas treatment module (2) is fixedly installed on the top of the biomass boiler combustion chamber (1), and a heat exchange conduit (3) with one inlet and one outlet is fixedly installed in the tail gas treatment module (2). A driving module (4) is arranged on the outer surface of the biomass boiler combustion chamber (1), and the output end of the driving module (4) is located at the bottom of the biomass boiler combustion chamber (1) as a whole, and a rotating furnace module (5) movably sleeved in the bottom of the biomass boiler combustion chamber (1) is arranged on the output end; The biomass boiler combustion chamber (1) is further provided with a heat exchange module (6) connected to the heat exchange conduit (3); the rotary furnace module (5) comprises a bottom sleeve (51) with a circular notch fixedly connected to the bottom of the biomass boiler combustion chamber (1); the bottom of the bottom sleeve (51) with a circular notch movably clamps a tray cylindrical cover (52) through the notch of the inner ring; biofuel is placed inside the tray cylindrical cover (52) to heat the heat exchange module (6); The surface of the tray cylindrical cover (52) is provided with a scattering mechanism (9) which is integrally sleeved on the outside of the heat exchange module (6); the scattering mechanism (9) comprises a plurality of groups of ash storage units (96) and a biomass auxiliary material annular storage box (7) fixedly mounted on the outer edge of the tail gas treatment module (2); each group of ash storage units (96) is connected to the biomass auxiliary material annular storage box (7); and the driving action of the driving module (4) is used to stir the biomass fuel inside the tray cylindrical cover (52) while scattering the limestone powder in each group of ash storage units (96) into the combustion end in a circular manner; The heat exchange module (6) comprises a heating hood (61) fixedly connected to the center of the biomass boiler combustion chamber (1); the bottom of the heating hood (61) is a hemispherical structure, and a cavity structure exists between the outer surface of the heating hood (61) and the inner wall of the biomass boiler combustion chamber (1); a threaded coil (63) communicating with the heat exchange conduit (3) is fixedly installed inside the heating hood (61); a clamping annular plate (64) connected to the bottom of the biomass auxiliary material annular storage box (7) is fixedly installed on the upper side of the heating hood (61); a plurality of second leakage holes (65) communicating with the biomass auxiliary material annular storage box (7) are opened in a circular manner on the surface of the clamping annular plate (64); and a ring frame (66) with a protrusion is fixedly installed on the lower side of the heating hood (61) at a position where it intersects with the hemispherical bottom.

2. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 1 is characterized in that: The driving module (4) comprises a detachable auxiliary bracket (41) inserted and installed on the outer side of the biomass boiler combustion chamber (1), and one end of the detachable auxiliary bracket (41) away from the biomass boiler combustion chamber (1) extends to the bottom of the biomass boiler combustion chamber (1), and a servo motor (42) is fixedly installed on the end extending to the bottom of the biomass boiler combustion chamber (1), and the output end of the servo motor (42) is fixedly connected to an electric telescopic rod (43).

3. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 2 is characterized in that: A plurality of threaded sleeves (54) are provided at the bottom edge of the tray cylindrical cover (52), and an ash receiving cylinder (55) is installed at the bottom of the tray cylindrical cover (52) by bolts arranged through the threaded sleeves (54); the telescopic end of the electric telescopic rod (43) is fixedly installed at the center of the bottom of the ash receiving cylinder (55) by bolts; a leaking base (53) communicating with the ash receiving cylinder (55) is fixedly installed on the bottom surface of the tray cylindrical cover (52); a feeding pipe for injecting biomass fuel into the tray cylindrical cover (52) is fixedly connected to the outer side surface of the biomass boiler combustion chamber (1); and the biomass boiler combustion chamber (1) and the bottom cover (51) with the circular notch are an integral structure.

4. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 3 is characterized in that: A plurality of first leakage holes (62) are provided on the outer surface of the heating cover (61) in a circular manner from top to bottom, the inner bottom of the biomass auxiliary material annular storage box (7) is a beveled structure facing the second leakage hole (65), and a sealing cover is arranged on the outer side of the biomass auxiliary material annular storage box (7), the annular frame (66) with protrusions is an annular structure with a plurality of circular protrusions arranged at the outer edge position, and a gear annular sleeve (8) is fixedly mounted on the inner wall of the biomass boiler combustion chamber (1), and a tooth opening is arranged on the inner annular edge of the gear annular sleeve (8).

5. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 4 is characterized in that: The scattering mechanism (9) further comprises a multi-row gear rod sleeve (91) fixedly mounted at a middle position on the upper surface of the leakage opening base (53); a semi-circular arc bracket (92) is fixedly connected to the upper side of the multi-row gear rod sleeve (91); a first scraping plate (95) that fits with the hemispherical structure at the bottom of the heating cover (61) is fixedly mounted on the inner ring of the semi-circular arc bracket (92); a group of vertical auxiliary plates (94) flush with the heating cover (61) are fixedly connected at both side ends of the upper surface of the semi-circular arc bracket (92); a first scraping plate (95) that fits with the outer side surface of the heating cover (61) is also fixedly mounted on one side of the vertical auxiliary plates (94) facing the heating cover (61); a first circular arc bracket (93) is fixedly connected at a hinged position between the semi-circular arc bracket (92) and the vertical auxiliary plates (94); the first circular arc bracket (93) is located as a whole on the outer side of the heating cover (61).

6. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 5 is characterized in that: The ash storage units (96) are sequentially arranged on the first circular arc sleeve (93) in a circular pattern, and each ash storage unit (96) comprises an L-shaped discharge pipe (969) fixedly connected to the edge of the first circular arc sleeve (93), an inner opening (9610) is provided inside the L-shaped discharge pipe (969), a third sleeve (964) is fixedly connected to the side of the outer side of the L-shaped discharge pipe (969) that is flush with the heating cover (61), and a semicircular reserved cavity opening (9611) is fixedly connected to the side of the outer side of the L-shaped discharge pipe (969) that is flush with the surface of the leakage port base (53), and the semicircular reserved cavity opening (9611) is located On the upper side of the inner opening (9610), a limiting slot (9613) is provided between the semicircular reserved cavity (9611) and the inner opening (9610), a plurality of spring return rods (9612) are fixedly installed inside the semicircular reserved cavity (9611), a bow-shaped cover plate (9614) which is slidably sleeved in the limiting slot (9613) is fixedly installed on the protruding end of the spring return rod (9612), and both side ends of the bow-shaped cover plate (9614) are fixedly connected with a clamping plate (9615), and slots for the clamping plate (9615) to be engaged are provided on both sides of the inner side of the semicircular reserved cavity (9611).

7. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 6 is characterized in that: The arched cover plate (9614) extends into the inner opening (9610) through the limiting notch (9613), and a trigger head (9616) and an extension rod (9617) are fixedly connected to the arched cover plate (9614) extending into the inner opening (9610) on one side, one in front of the other, respectively. The trigger head (9616) extends out of one side of the L-shaped discharge pipe (969) as a whole and is in close contact with the ring of the protruding ring frame (66), while the extension rod (9617) is oriented opposite to the trigger head (9616). The L-shaped discharge pipe (969) is A bottom plate cover (9619) is fixedly connected to the side opposite to the semicircular reserved cavity (9611) on the extension rod (9617), and a plurality of ash outlet slots (9620) are provided on the bottom plate cover (9619). An arc-shaped scraper (9621) that fits the bottom plate cover (9619) is fixedly installed on the outer protruding end of the extension rod (9617). A second scraper plate (9618) is also fixedly installed on the outer rod surface of the extension rod (9617), and the bottom of the second scraper plate (9618) is also in contact with the bottom plate cover (9619).

8. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 7 is characterized in that: The third sleeve (964) is provided with a concave socket tube (965) on the upper side of the circular ring, and the first sleeve (961) is movably inserted into the concave socket tube (965), and the bottom of the first sleeve (961) is fixedly connected with a convex socket tube (962) that is plugged into and corresponds to the concave socket tube (965) at one end of the third sleeve (964), and the upper side of the first sleeve (961) is also fixedly installed with a convex socket tube (962), and the concave socket tube (965) is movably inserted into the first sleeve (961). The convex socket tube (962) on the side is movably inserted with a second sleeve (963), and the bottom of the second sleeve (963) is also provided with a concave socket tube (965) corresponding to the convex socket tube (962) on the upper side of the first sleeve (961). Gear sleeve blocks (966) are fixedly installed on the outer surface of the first sleeve (961), and the gear sleeve blocks (966) are meshed with the gear ring sleeve (8) on the inner wall of the biomass boiler combustion chamber (1).

9. The emission reduction and environmentally friendly biomass boiler combustion equipment according to claim 8 is characterized in that: The first sleeve (961) is fixedly connected to an impeller rod (967) at its interior, and the two sides of the impeller rod (967) extend into the second sleeve (963) and the third sleeve (964) respectively. A second circular arc sleeve frame (97) is fixedly mounted on the upper side of the second sleeve (963), and a transfer module (98) is fixedly mounted on the upper side of the second circular arc sleeve frame (97). The transfer module (98) comprises a circular ring clamping cavity (981) movably sleeved in the clamping mouth of the clamping circular ring plate (64). An oblique opening (982) corresponding to each second sleeve (963) is provided inside the cavity (981), and a reserved circular opening (983) communicating with the second sleeve (963) on the same side is provided in each oblique opening (982), and each impeller rod (967) extending from the second sleeve (963) extends from the oblique opening (982) through the reserved circular opening (983), and a stirring plate (968) is fixedly mounted on the impeller rod (967) extending from the inside of the oblique opening (982).

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