Biomass grate furnace device and biomass power generation device capable of achieving up-to-standard emission of nitrogen oxides

Abstract

The utility model relates to a biomass grate furnace device capable of achieving up-to-standard emission of nitrogen oxides and a biomass power generation device. The biomass grate furnace device comprises a biomass grate furnace mechanism, a biomass power generation device and a biomass power generation device, wherein the biomass grate furnace mechanism comprises a biomass grate furnace body and a transition flue assembly; the single-pipe cyclone dust removal mechanism comprises a first drainage pipeline, a single-pipe cyclone dust removal assembly and a second drainage pipeline, the first drainage pipeline communicates with the transition flue assembly and the single-pipe cyclone dust removal assembly, and an outlet of the single-pipe cyclone dust removal assembly communicates with the first end of the second drainage pipeline; the economizer mechanism comprises an economizer flue, a catalyst assembly and multiple sets of heat exchangers, the catalyst assembly and the multiple sets of heat exchangers are all arranged in the economizer flue, and the catalyst assembly is located on the side close to the second drainage pipeline; the upper end of the ash discharge mechanism is communicated with an ash outlet of the single-pipe cyclone dust removal assembly, and the lower end of the ash discharge mechanism is communicated with the slag conveying mechanism. According to the technical scheme, the purpose of up-to-standard emission of nitrogen oxide of the grate furnace is achieved, and compared with the prior art, the problems that a dust removal mechanism in front of a catalyst is high in manufacturing and maintaining cost, long in technical improvement time and the like are greatly solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass grate furnace ash removal, in particular to a biomass grate furnace device for standard emission of nitrogen oxides and a biomass power generation device. BACKGROUND

[0002] Standard emission of nitrogen oxides and ash deposition and hardening in the tail economizer passage are difficult problems for biomass grate furnaces, in order to achieve standard emission of nitrogen oxides, some enterprises adopt a high-investment and high-maintenance-cost ceramic filter cartridge dust removal and denitration integrated process or a high-temperature metal filter cartridge combined with a medium-high-temperature catalyst process, and some enterprises also adopt a SNCR process of excessively spraying urea or ammonia water solution in the furnace chamber, which causes excessive ammonia escape and easily forms deposition of ammonium bisulfate in the tail economizer passage of the boiler, resulting in corrosion and ash deposition of the heating surface.

[0003] The present application overcomes the above problems on the basis of meeting the standard emission of nitrogen oxides.

[0004] Meanwhile, the present application adopts a single-cylinder cyclone dust collector, which is more convenient to maintain than the boiler internal multi-pipe dust removal device of the application with the application number 201310386271.0. Practical new type content

[0005] The present application provides a biomass grate furnace device for standard emission of nitrogen oxides and a biomass power generation device to solve the problems of high manufacturing cost and long manufacturing period of the dust removal mechanism of the biomass grate furnace device in the prior art.

[0006] According to the biomass grate furnace device for standard emission of nitrogen oxides provided by the present application, the biomass grate furnace device comprises a biomass grate furnace mechanism, a single-tube cyclone dust removal mechanism, an economizer mechanism and an ash removal mechanism.

[0007] Further, the single-tube cyclone dust removal assembly comprises a dust removal shell, a spiral plate and a separation cylinder, the spiral plate and the separation cylinder are arranged in the dust removal shell, the spiral plate is spirally arranged on the outer wall of the separation cylinder, the side wall of the dust removal shell is provided with an inlet, the bottom wall of the dust removal shell is provided with an ash outlet, the top wall of the dust removal shell is provided with a smoke outlet, the outer edge of the spiral plate and the inner wall of the dust removal shell have a predetermined horizontal distance, and the upper outlet of the separation cylinder is connected with the first end of the second flow guide pipeline.

[0008] Further, the ratio of the predetermined horizontal distance between the outer edge of the spiral plate and the inner wall of the corresponding dust removal shell to the horizontal width of the corresponding spiral plate is between 1 / 8 and 1 / 3.

[0009] Further, the center axis of the separation cylinder is parallel to the center axis of the dust removal shell, and the separation cylinder body and the dust removal shell are arranged eccentrically.

[0010] Further, the ratio of the longest distance between the outer wall of the separation cylinder and the inner wall of the dust removal shell to the shortest distance between the outer wall of the separation cylinder and the inner wall of the dust removal shell is between 2 and 6.

[0011] Further, the biomass grate furnace device further comprises a pre-dust removal mechanism, and the pre-dust removal mechanism is arranged at the inlet of the transition flue assembly.

[0012] Further, the pre-dust removal mechanism comprises a filter screen mounting rack assembly and a filter screen assembly, the filter screen assembly is mounted on the filter screen mounting rack assembly, and the filter screen mounting rack assembly is mounted on the transition flue assembly.

[0013] Further, the inner wall of the transition flue assembly has a mounting plate, and the filter screen mounting rack assembly is mounted on the mounting plate through fasteners.

[0014] Further, the gap of the filter screen assembly is between 1.5 mm and 2.8 mm.

[0015] According to another aspect of the present application, a biomass power generation device is also provided, which comprises a biomass grate furnace device, a steam turbine and a generator connected in sequence, and the biomass grate furnace device is the biomass grate furnace device described above.

[0016] By applying the technical solution of the present application, the flue gas generated by the biomass grate furnace device is subjected to dust removal by the single-tube cyclone dust removal mechanism, the flue gas after dust removal enters the economizer flue through the second flow guide pipeline, is subjected to denitration by the catalyst assembly, and then passes through the multiple groups of heat exchangers for heat exchange. The single-tube cyclone dust removal mechanism only needs to be provided with one dust removal tube, and the cost of setting up more tubes is low, the processing efficiency is high, and the maintenance is convenient. The technical solution of the present application not only solves the problem of standard emission of nitrogen oxides of the grate furnace, but also greatly reduces the problems of high manufacturing and maintenance cost of the catalyst pre-dust removal mechanism and long technical improvement time compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings required by the embodiments or prior art description will be briefly introduced as follows. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0019] Figure 1 Fig. 1 shows the overall structure schematic diagram of the biomass grate furnace device of the embodiment of the present application;

[0020] Figure 2 Fig. 2 shows the internal structure schematic diagram of the single-tube cyclone dust removal mechanism of the biomass grate furnace device of the embodiment of the present application; Figure 1

[0021] Figure 3 Fig. 3 shows the overall structure schematic diagram of the biomass grate furnace device of the embodiment of the present application;

[0022] Figure 4 Fig. 4 shows the structure schematic diagram of the pre-dust removal mechanism of the biomass grate furnace device of the embodiment of the present application; Figure 3

[0023] Figure 5 Fig. 5 shows the installation structure schematic diagram of the pre-dust removal mechanism of the biomass grate furnace device of the embodiment of the present application; Figure 3

[0024] Figure 6 Fig. 6 shows the structure schematic diagram of the single-tube cyclone dust removal assembly of the biomass grate furnace device of the embodiment of the present application.

[0025] Among them, the above drawings include the following reference signs:

[0026] 10, biomass grate furnace mechanism; 11, biomass grate furnace body; 12, transition flue assembly; 20, single-tube cyclone dust removal mechanism; 21, first flow guide pipeline; 22, single-tube cyclone dust removal assembly; 221, dust removal shell; 222, spiral plate; 223, separation cylinder; 23, second flow guide pipeline; 30, coal economizer mechanism; 31, coal economizer flue; 32, catalyst assembly; 33, heat exchanger; 40, ash removal mechanism; 50, slag conveying mechanism; 60, pre-dust removal mechanism; 61, filter screen mounting rack assembly; 62, filter screen assembly; 70, rapping mechanism. DETAILED DESCRIPTION

[0027] ​​​It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0029] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned at 90 degrees or in other orientations in other different ways, and the spatial relative descriptions used herein are interpreted accordingly.

[0030] As shown in FIGS. 1 and 2, the biomass grate furnace device for meeting the emission standard of nitrogen oxides according to the embodiment comprises a biomass grate furnace mechanism 10, a single-tube cyclone dust removal mechanism 20, an economizer mechanism 30, and an ash removal mechanism 40. Figure 1 As shown in FIGS. 1 and 2, the biomass grate furnace device for meeting the emission standard of nitrogen oxides according to the embodiment comprises a biomass grate furnace mechanism 10, a single-tube cyclone dust removal mechanism 20, an economizer mechanism 30, and an ash removal mechanism 40. Figure 2 As shown in FIGS. 1 and 2, the biomass grate furnace device for meeting the emission standard of nitrogen oxides according to the embodiment comprises a biomass grate furnace mechanism 10, a single-tube cyclone dust removal mechanism 20, an economizer mechanism 30, and an ash removal mechanism 40. The biomass grate furnace mechanism 10 comprises a biomass grate furnace body 11 and a transition flue assembly 12. The first end of the transition flue assembly 12 is in communication with the smoke outlet of the biomass grate furnace body 11, and the transition flue assembly 12 is vertically arranged. The single-tube cyclone dust removal mechanism 20 comprises a first flow guide pipe 21, a single-tube cyclone dust removal assembly 22, and a second flow guide pipe 23. The first end of the first flow guide pipe 21 is in communication with the outlet of the transition flue assembly 12, the second end of the first flow guide pipe 21 is in communication with the inlet of the single-tube cyclone dust removal assembly 22, and the outlet of the single-tube cyclone dust removal assembly 22 is in communication with the first end of the second flow guide pipe 23. The economizer mechanism 30 comprises an economizer flue 31, a catalyst assembly 32, and multiple sets of heat exchangers 33. The economizer flue 31 is in communication with the second end of the second flow guide pipe 23, the catalyst assembly 32 and the multiple sets of heat exchangers 33 are arranged in the economizer flue 31, and the catalyst assembly 32 is located on the side close to the second flow guide pipe 23. The upper end of the ash removal mechanism 40 is in communication with the ash outlet of the single-tube cyclone dust removal assembly 22, and the lower end of the ash removal mechanism 40 is in communication with the slag conveying mechanism 50. The biomass grate furnace device for meeting the emission standard of nitrogen oxides according to the embodiment has the following advantages.

[0031] Applying the technical solution of this embodiment, the flue gas generated by the biomass grate furnace mechanism 10 is dusted by a single-tube cyclone dust collector 20. After dust removal, the flue gas enters the economizer flue 31 through the second diversion pipe 23, undergoes denitrification through the catalyst assembly 32, and then passes through multiple sets of heat exchangers 33 for heat exchange. The single-tube cyclone dust collector 20 only requires one dust collector pipe, while the cost of installing multiple pipes is lower, the processing efficiency is high, and maintenance is convenient. The technical solution of this embodiment not only solves the problem of achieving nitrogen oxide emission standards in grate furnaces, but also significantly reduces the problems of high manufacturing and maintenance costs and long technical transformation time of the pre-catalyst dust collector mechanism compared with the prior art.

[0032] It should be noted that the single-tube cyclone dust collector 20 is also more convenient and efficient to maintain than multi-tube dust collectors. For example, multi-tube dust collectors may require the replacement of multiple tubes, while the single-tube cyclone dust collector 20 only requires local maintenance, making maintenance convenient.

[0033] like Figure 1 and Figure 2 As shown, in the technical solution of Embodiment 1, the single-tube cyclone dust removal assembly 22 includes a dust removal housing 221, a spiral plate 222, and a separation cylinder 223. The spiral plate 222 and the separation cylinder 223 are both disposed inside the dust removal housing 221. The spiral plate 222 is spirally disposed on the outer wall of the separation cylinder 223. An inlet is provided on the side wall of the dust removal housing 221, an ash outlet is provided on the bottom wall of the dust removal housing 221, and a smoke outlet is provided on the top wall of the dust removal housing 221. There is a predetermined horizontal distance between the outer edge of the spiral plate 222 and the inner wall of the dust removal housing 221. The upper outlet of the separation cylinder 223 is connected to the first end of the second diversion pipe 23. Under the guidance of the spiral plate 222, the flue gas containing soot is separated from the soot by centrifugal force. The soot passes through the gap between the outer edge of the spiral plate 222 and the inner wall of the dust collector housing 221, and enters the ash discharge mechanism 40 through the ash outlet under the action of gravity. The flue gas enters the second guide pipe 23 through the separation cylinder 223 under the action of negative pressure. The above structure has low cost and is easy to use. It should be noted that the lower outlet of the separation cylinder 223 is connected to the internal space of the dust collector housing 221. The central axis of the dust collector housing 221 is parallel to the central axis of the separation cylinder 223. The dust collector housing 221 includes an upper cylindrical structure and a lower conical structure. The lower port of the separation cylinder 223 is located inside the cylindrical structure of the dust collector housing 221 and is located near the lower end of the cylindrical structure.

[0034] like Figure 1 and Figure 2 As shown, in the technical solution of Embodiment 1, the predetermined horizontal distance between the outer edge of the spiral plate 222 and the inner wall of the corresponding dust collector housing 221 is between 1 / 8 and 1 / 3 of the horizontal width of the corresponding spiral plate 222. Figure 2The ratio of N:M is between 1 / 8 and 1 / 3. The ratio of the above structure ensures the flow of most flue gas on the one hand, and the better separation of the centrifugal separation of the soot on the other hand. The embodiment adopts a predetermined horizontal distance between the outer edge of the spiral plate 222 and the inner wall of the corresponding dust removal shell 221, and the ratio of the horizontal width of the corresponding spiral plate 222 is 1 / 5.

[0035] As shown in Figure 2 In the technical solution of embodiment one, the center axis of the separation cylinder 223 is parallel to the center axis of the dust removal shell 221, and the separation cylinder 223 body is eccentrically arranged with the dust removal shell 221. By eccentric arrangement, the flue gas flow velocity changes, so that the centrifugal force acting on the soot also changes. Through experimental comparison, the center axis of the separation cylinder 223 is parallel to the center axis of the dust removal shell 221, which improves the separated soot effect by about 5% compared with the center axis of the separation cylinder 223 coinciding with the center axis of the dust removal shell 221. That is, in the area with higher flow rate, some smaller soot can also be removed, reducing the soot accumulation in the subsequent coal economizer.

[0036] As shown in Figure 3 In the technical solution of embodiment one, the ratio of the longest distance between the outer wall of the separation cylinder 223 and the inner wall of the dust removal shell 221 and the shortest distance between the outer wall of the separation cylinder 223 and the inner wall of the dust removal shell 221 is between 2 and 6. According to fluid mechanics and experimental results, the above structure is reasonable and has good separation effect. If the distance is small, the flow rate difference is small, and when the running time is long, the phenomenon of soot accumulation may occur. It should be noted that there will always be soot floating in the space of the dust removal shell 221. This floating soot will reach equilibrium and is not easy to form accumulation and blockage.

[0037] As known from the above, the high-temperature flue gas of the boiler furnace flows from the furnace through the heating surface to the first flow guide pipeline 21. The single-cylinder cyclone dust collector (single-pipe cyclone dust removal assembly 22) is arranged after the first flow guide pipeline 21. The single-pipe cyclone dust removal assembly 22 removes most of the particles in the flue gas, meeting the application conditions of the catalyst. Then, the flue gas enters the first layer of medium-temperature catalyst (the catalyst assembly 32 includes the first layer of medium-temperature catalyst, the second layer of medium-temperature catalyst, and the third layer of medium-temperature catalyst) through the second flow guide pipeline 23. A urea solution injection mechanism is arranged at the inlet of the first layer of medium-temperature catalyst to provide a reducing agent for denitration. A flow regulation grid is arranged in front of the first layer of medium-temperature catalyst to further ensure the uniformity of the flue gas before entering the first layer of medium-temperature catalyst. The soot blowers are arranged at the upper parts of the first layer of medium-temperature catalyst, the second layer of medium-temperature catalyst, and the third layer of medium-temperature catalyst, which are the first layer of medium-temperature catalyst upper part acoustic soot blower, the second layer of medium-temperature catalyst upper part acoustic soot blower, and the third layer of medium-temperature catalyst upper part acoustic soot blower, respectively. The above structure is not described in detail in this application.

[0038] The cyclone dust collector removes most of the smoke dust in the flue gas, and then the flue gas is directly discharged to the slag conveying mechanism 50 through the lower cyclone dust collector ash discharge pipe (ash discharge mechanism 40).

[0039] In this example, the high-temperature catalyst is selected as a honeycomb type, and three layers are arranged according to the design of the denitration efficiency to ensure that the outlet nitrogen oxide emission concentration is ≤50 mg / Nm 3 The technical scheme of the present application solves the problems of standard emission of nitrogen oxides and ash deposition and hardening of the tail heating surface of the biomass grate furnace.

[0040] The high-temperature flue gas after efficient denitration flows through the denitration tail coal economizer mechanism 30 to the lower tail heating surface, completes the complete denitration of the flue gas, and realizes the standard emission of nitrogen oxides.

[0041] The process design of the present application avoids the problems of ash deposition and poisoning of the catalyst, which leads to short-term blockage and failure of the catalyst during the application of the medium-high temperature catalyst in the biomass grate furnace on the market, ensures the continuous operation of the catalyst, and greatly improves the ammonium bisulfate deposition and ash deposition of the tail heating surface due to the spraying of a large amount of urea or ammonia water solution into the furnace.

[0042] As shown in Figure 4 and Figures 3 to 5 The technical scheme of Example Two and the technical scheme of Example One differ in that the biomass grate furnace device further comprises a pre-dust removal mechanism 60, and the pre-dust removal mechanism 60 is arranged at the inlet of the transition flue assembly 12. The arrangement of the pre-dust removal mechanism 60 reduces the burden on the single-tube cyclone dust collector 20, and the single-tube cyclone dust collector 20 can be mainly designed for small particle ash under the conditions of the arrangement of the mechanical structure and the operating process parameters such as negative pressure. On the other hand, the arrangement of the pre-dust removal mechanism 60 greatly reduces the wear of the superheater (such as the primary superheater and the secondary superheater) by ash, in addition, reduces the passage of large particle ash through the superheater, and further improves the heat exchange efficiency of the superheater.

[0043] As shown in Figure 5 In the technical scheme of Example Two, the pre-dust removal mechanism 60 comprises a filter screen mounting rack assembly 61 and a filter screen assembly 62, the filter screen assembly 62 is mounted on the filter screen mounting rack assembly 61, and the filter screen mounting rack assembly 61 is mounted on the transition flue assembly 12. The above structure facilitates the installation of the pre-dust removal mechanism 60, so that the service life of the pre-dust removal mechanism 60 is longer.

[0044] As shown in Figure 6As shown, in the technical solution of Embodiment 2, the inner wall of the transition flue assembly 12 has a mounting plate, and the filter mounting bracket assembly 61 is mounted on the mounting plate by fasteners. The mounting plate is divided into an upper mounting plate and a lower mounting plate. The filter mounting bracket assembly 61 is located between the upper mounting plate and the lower mounting plate. The gap between the upper mounting plate and the lower mounting plate is greater than the thickness of the filter mounting bracket assembly 61. A spring is installed between the filter mounting bracket assembly 61 and the upper mounting plate. This embodiment also includes a rapping mechanism 70, which includes a motor, a drive shaft, and a rapping hammer. The motor is located outside the transition flue assembly 12 and passes through the transition flue assembly 12 via the drive shaft. The rapping hammer is installed inside the transition flue assembly 12. The two ends of the drive shaft are connected to the output shaft of the motor and the rapping hammer, respectively. The drive shaft and the transition flue assembly 12 are sealed with high-temperature resistant materials, such as stainless steel rings. The contact surface between the ring and the drive shaft has high machining precision, which can ensure the rotation of the drive shaft and prevent the leakage of flue gas. It should be noted that the pre-dust removal mechanism 60 can be installed horizontally or at a predetermined angle to the horizontal plane.

[0045] In this embodiment, the gap of the filter assembly 62 is between 1.5mm and 2.8mm. In this embodiment, the pre-dust removal mechanism 60 and the single-tube cyclone dust removal mechanism 20 work together. That is, the pre-dust removal mechanism 60 does not need to remove all the dust. The pre-dust removal mechanism 60 removes some of the larger dust particles, while the single-tube cyclone dust removal mechanism 20 removes the smaller dust particles.

[0046] like Figure 5 As shown, the difference between the technical solution of Embodiment 3 and that of Embodiment 1 is that the spiral spacing of the spiral plate 222 gradually decreases from top to bottom. This further improves the efficiency of the single-tube cyclone dust collector 20. During the separation process of the flue dust within the single-tube cyclone dust collector 20, the flue dust particles are gradually separated from large to small. It should be noted that in the technical solution of this embodiment, ​ The upper spiral spacing D is three times the lower spiral spacing d.

[0047] According to another aspect of this application, a biomass power generation device is also provided, comprising a connected biomass grate furnace, a steam turbine, and a generator, wherein the biomass grate furnace is the aforementioned biomass grate furnace. The biomass power generation device of this application has high power generation efficiency.

[0048] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the exemplary embodiments of this application is limited only by the appended claims. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0049] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an ordinal meaning. Rather, such terms are used to distinguish between similar objects or actions. It should also be noted that the terms "coupled" and "connected" along with their derivatives, as used herein, can be used in

[0050] The only limitation of the present application is the claims as they appear hereinafter. The foregoing description, for the purpose of exemplification, has been presented in connection with what is presently considered to be the most practical and preferred embodiments. However, it is recognized that various modifications or changes in form and detail could be made to the above described embodiments without departing from the spirit and scope of the application. Therefore, the scope of the application should not be limited by the embodiments described above, but should be defined only in accordance with the following claims.

Claims

1. A biomass grate furnace device that achieves nitrogen oxide emission standards, characterized in that, include: Biomass grate furnace mechanism (10), the biomass grate furnace mechanism (10) includes a biomass grate furnace body (11) and a transition flue assembly (12), the first end of the transition flue assembly (12) is connected to the flue outlet of the biomass grate furnace body (11), and the transition flue assembly (12) is vertically arranged; A single-tube cyclone dust collector (20) includes a first diversion pipe (21), a single-tube cyclone dust collector assembly (22), and a second diversion pipe (23). The first end of the first diversion pipe (21) is connected to the outlet of the transition flue assembly (12), the second end of the first diversion pipe (21) is connected to the inlet of the single-tube cyclone dust collector assembly (22), and the outlet of the single-tube cyclone dust collector assembly (22) is connected to the first end of the second diversion pipe (23). Economizer mechanism (30), the economizer mechanism (30) includes economizer flue (31), catalyst assembly (32) and multiple heat exchangers (33), the economizer flue (31) is connected to the second end of the second diversion pipe (23), the catalyst assembly (32) and the multiple heat exchangers (33) are all arranged in the economizer flue (31), and the catalyst assembly (32) is located on the side close to the second diversion pipe (23); The ash discharge mechanism (40) is connected at its upper end to the ash outlet of the single-tube cyclone dust collector assembly (22), and at its lower end to the slag conveying mechanism (50).

2. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 1, characterized in that, The single-tube cyclone dust collector assembly (22) includes a dust collector housing (221), a spiral plate (222), and a separation cylinder (223). The spiral plate (222) and the separation cylinder (223) are both disposed inside the dust collector housing (221). The spiral plate (222) is spirally disposed on the outer wall of the separation cylinder (223). The side wall of the dust collector housing (221) is provided with an inlet. The bottom wall of the dust collector housing (221) is provided with an ash outlet. The top wall of the dust collector housing (221) is provided with a smoke outlet. The outer edge of the spiral plate (222) is at a predetermined horizontal distance from the inner wall of the dust collector housing (221). The upper outlet of the separation cylinder (223) is connected to the first end of the second diversion pipe (23).

3. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 2, characterized in that, The predetermined horizontal distance between the outer edge of the spiral plate (222) and the inner wall of the corresponding dust removal housing (221) is between 1 / 8 and 1 / 3 of the horizontal width of the corresponding spiral plate (222).

4. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 2, characterized in that, The central axis of the separation cylinder (223) is parallel to the central axis of the dust removal housing (221), and the separation cylinder (223) is eccentrically positioned relative to the dust removal housing (221).

5. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 4, characterized in that, The ratio of the longest distance between the outer wall of the separation cylinder (223) and the inner wall of the dust removal housing (221) to the shortest distance between the outer wall of the separation cylinder (223) and the inner wall of the dust removal housing (221) is between 2 and 6.

6. The biomass grate furnace device for achieving nitrogen oxide emission standards according to any one of claims 1 to 5, characterized in that, The biomass grate furnace device also includes a pre-dust removal mechanism (60), which is located at the inlet of the transition flue assembly (12).

7. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 6, characterized in that, The pre-dust removal mechanism (60) includes a filter mounting bracket assembly (61) and a filter assembly (62), wherein the filter assembly (62) is mounted on the filter mounting bracket assembly (61) and the filter mounting bracket assembly (61) is mounted on the transition flue assembly (12).

8. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 7, characterized in that, The inner wall of the transition flue assembly (12) has a mounting plate, and the filter mounting bracket assembly (61) is mounted on the mounting plate by fasteners.

9. The biomass grate furnace device for achieving nitrogen oxide emission standards according to claim 7, characterized in that, The gap of the filter assembly (62) is between 1.5 mm and 2.8 mm.

10. A biomass power generation device, characterized in that, The biomass power generation device includes a connected biomass grate furnace device, a steam turbine, and a generator, wherein the biomass grate furnace device is the biomass grate furnace device according to any one of claims 1 to 9.

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