Biomass boiler denitration mechanism and biomass boiler device
By introducing a pre-dust removal component and combining it with a medium-high temperature SCR catalyst in a biomass boiler, the problems of large footprint and easy catalyst poisoning and ash accumulation in biomass boiler denitrification devices have been solved, achieving efficient and stable denitrification effect and reducing operating costs.
Patent Information
- Application Number
- CN202423243005.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing biomass boiler denitrification devices occupy a large area and suffer from problems such as catalyst poisoning, ash accumulation, and high operating costs.
By combining a pre-dust removal component with a medium-high temperature SCR catalyst, flue gas and dust are separated by cyclones, reducing the need for an SNCR device. A soot blowing structure is set up to prevent ash accumulation on the catalyst. A medium-high temperature catalyst is used for denitrification. The flue gas first enters the pre-dust removal device and then enters the catalyst, reducing the footprint.
It effectively reduces the footprint of the denitrification unit, improves the stability and denitrification efficiency of the catalyst, reduces operating costs, and avoids catalyst poisoning and ash accumulation problems.
Smart Images
Figure CN223595963U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of biomass boiler denitration, in particular to a biomass boiler denitration mechanism and a biomass boiler device. BACKGROUND
[0002] At present, in order to meet the emission standard, the following several processes are used for denitration of nitrogen oxides of domestic biomass boiler:
[0003] The first kind: SNCR denitration. The SNCR denitration efficiency is limited, in order to meet the emission standard of nitrogen oxides, the consumption of urea or ammonia water is high, there is a risk of ammonia escape exceeding the standard, and high ammonia escape is easy to form ammonium salt deposition on the tail heating surface of the boiler, which causes the tail low-temperature heating surface to be blocked and cleaned online or the boiler to be stopped and cleaned frequently, and long-time high ammonia escape also causes corrosion of the tail low-temperature heating surface and the flue of the boiler, which greatly increases the operation cost and maintenance cost.
[0004] The second kind: SNCR+external high-temperature metal filter cylinder+medium-high-temperature SCR catalyst process. That is, SNCR preliminary denitration is first carried out in the furnace, and then the flue gas is introduced from the boiler transition flue, dusted by the high-temperature metal filter cylinder, introduced into the medium-high-temperature catalyst arranged at the top of the dust remover, and further denitration reaction is carried out. This process has large investment and occupies large area, and the temperature drop of the flue gas introduced and introduced is high, and the heat loss is large.
[0005] The third kind: SNCR+external high-temperature ceramic filter cylinder dusting and denitration integrated process. That is, SNCR preliminary denitration is first carried out in the furnace, and then the flue gas is introduced from the boiler transition flue, dusted by the outer layer of the high-temperature ceramic filter cylinder, and then catalytically denitration by the inner layer of the high-temperature denitration layer. The investment of this process is higher than that of the second kind of high-temperature metal filter process, and the technology has not been broken through at present. The longest ceramic filter cylinder is 3-3.5 meters, and the technical transformation occupies the largest area. Like the second kind of external metal filter process, the temperature drop of the flue gas introduced and introduced is high, and the heat loss is large.
[0006] The fourth kind: SNCR+tail desulfurization and dust removal+medium-low-temperature SCR catalyst process. That is, SNCR preliminary denitration is first carried out in the furnace, and then the flue gas is introduced from the boiler outlet, pre-dusted by a cyclone, desulfurized, and introduced into a bag filter, and then heated by steam to 220-260 DEG C, and then introduced into a medium-low-temperature catalyst for further denitration reaction. The medium-low-temperature catalyst is sensitive to the inlet sulfur dioxide concentration, and has high requirements for the operation efficiency and stability of desulfurization. At the same time, in order to meet the catalytic reaction, the flue gas needs to be reheated by steam, and the operation cost is extremely high. The surface layer of the catalyst is easy to form tar deposition, and needs to be periodically analyzed at high temperature, the operation stability is poor, and the maintenance workload is large.
[0007] Taking the second and fourth kinds of denitration processes described above as examples, the denitration devices described above occupy a large area. CONTENT OF THE UTILITY MODEL
[0008] The application provides a biomass boiler denitration mechanism and a biomass boiler device to solve the problem of large occupation area of the biomass boiler denitration mechanism in the prior art.
[0009] According to the biomass boiler denitration mechanism provided by the application, the first end of the pre-dedusting assembly is in communication with the flue outlet of the biomass boiler, the second end of the pre-dedusting assembly is in communication with the first end of the denitration flue section, the outlet at the bottom of the pre-dedusting assembly is in communication with the smoke dust collecting assembly, and the second end of the denitration flue section is in communication with the economizer assembly.
[0010] Further, the pre-dedusting assembly comprises a pre-dedusting flue section, a pre-dedusting structure and a residue conveying structure, the first end of the pre-dedusting flue section is in communication with the flue outlet of the biomass boiler, the second end of the pre-dedusting flue section is in communication with the first end of the denitration flue section, the residue conveying structure is in communication with the ash outlet of the sidewall of the pre-dedusting flue section, and the pre-dedusting structure is arranged in the pre-dedusting flue section and is arranged in correspondence with the ash outlet of the sidewall of the pre-dedusting flue section.
[0011] Further, the pre-dedusting structure comprises a cyclone, the cyclone comprises a separation cylinder and a gas outlet cylinder, the gas outlet cylinder is at least partially arranged in the separation cylinder, the separation cylinder has a separation cylinder inlet and a separation cylinder outlet, the separation cylinder inlet is located at the upper sidewall of the separation cylinder, the separation cylinder outlet is located at the bottom of the separation cylinder, the inner wall surface of the separation cylinder inlet has a downward spiral guide arc, the lower end of the gas outlet cylinder is located in the separation cylinder, and the upper end of the gas outlet cylinder is located outside the separation cylinder.
[0012] Further, the separation cylinder comprises a cylindrical section and a conical section, the lower end of the cylindrical section is in communication with the upper end of the conical section, in the direction from top to bottom, the diameter of the conical section gradually shrinks, the lower end of the conical section has an ash outlet, the center axis of the gas outlet cylinder coincides with the center axis of the separation cylinder, and the lower end of the gas outlet cylinder has a predetermined distance from the inner wall of the conical section.
[0013] Further, the pre-dedusting structure comprises a partition plate, a plurality of mounting holes are arranged on the partition plate, the cyclone is a plurality of cyclones, and the separation cylinder inlets of the plurality of cyclones are in one-to-one correspondence with the mounting holes of the plurality of partition plates.
[0014] Further, the pre-dedusting structure further comprises an air inlet and outlet partition plate, the air inlet and outlet partition plate is located in the pre-dedusting flue section to divide the pre-dedusting flue section into an air inlet space and an air outlet space, the upper end of the gas outlet cylinder is located in the air outlet space, and the air outlet space is in communication with the denitration flue section.
[0015] Further, the soot blowing structure is a sonic soot blower, a steam soot blower, or a sonic soot blower combined with a steam soot blower.
[0016] Further, the biomass boiler denitration mechanism further comprises a denitration agent injection assembly, an outlet of the denitration agent injection assembly is arranged in the denitration flue section, and / or the outlet of the denitration agent injection assembly is arranged in the biomass boiler.
[0017] According to another aspect of the present application, a biomass boiler device is further provided, the biomass boiler device comprising a biomass boiler, a biomass boiler denitration mechanism, and an economizer assembly, the biomass boiler denitration mechanism being connected between the biomass boiler and the economizer assembly, and the biomass boiler denitration mechanism being the biomass boiler denitration mechanism described above.
[0018] Further, the biomass boiler comprises a boiler body, a superheater assembly, and a transition flue, an outlet of the boiler body is connected to a first end of the transition flue through the superheater assembly, a second end of the transition flue is connected to the pre-dust removal assembly, and the transition flue has a first flue gas guide structure at an end close to the pre-dust removal assembly, and the denitration flue section has a second flue gas guide structure at an end close to the pre-dust removal assembly.
[0019] By using the technical solution of the present application, the flue gas enters the pre-dust removal assembly for dust removal, so that the catalyst structure is not easily covered by a large amount of dust during subsequent denitration, and the flue gas treatment effect is good. In addition, after dust removal, the catalyst structure is not easily poisoned, and the flue gas treatment effect is improved. The denitration is performed by combining the pre-dust removal assembly and the SCR catalyst process, which reduces the SNCR device of the SNCR and SCR catalyst process in the prior art, and therefore, the device reduces the floor area. The technical solution of the present application effectively solves the problem of large floor area of the biomass boiler denitration mechanism in the prior art. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings required to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.
[0022] Figure 1 FIG. 1 shows a process structure schematic diagram of a biomass boiler denitration mechanism according to Embodiment One of the present application;
[0023] Figure 2 FIG. 2 shows a process structure schematic diagram of a biomass boiler denitration mechanism according to Embodiment Two of the present application;Figure 1 a partial view of a pre-dedusting structure of a biomass boiler denitration mechanism;
[0024] Figure 3 a partial view of a pre-dedusting structure of a biomass boiler denitration mechanism is shown; Figure 2 a partial view of a pre-dedusting structure of a biomass boiler denitration mechanism is shown;
[0025] Figure 4 a partial view of a pre-dedusting structure of a biomass boiler denitration mechanism is shown; Figure 1 a partial view of a pre-dedusting structure of a biomass boiler denitration mechanism is shown.
[0026] Wherein, the above drawings include the following reference signs:
[0027] 10, pre-dedusting assembly; 11, pre-dedusting flue section; 12, pre-dedusting structure; 121, separation cylinder; 122, gas outlet cylinder; 13, slag conveying structure; 20, denitration assembly; 21, denitration flue section; 23, catalyst structure; 24, soot blowing structure; 25, rectifying grid structure; 26, second flue gas guide structure; 30, biomass boiler; 31, boiler body; 32, superheater assembly; 321, first heating surface; 33, transition flue; 34, first flue gas guide structure; 40, economizer assembly; 41, second heating surface; 50, denitration agent injection assembly. DETAILED DESCRIPTION
[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.
[0029] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.
[0030] For ease 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 respect to 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 devices as described in the drawings. For example, if the devices in the drawings are 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.
[0031] As Figures 1 to 4 shown, the biomass boiler denitration mechanism of the embodiment one comprises: a pre-dust removal assembly 10 and a denitration assembly 20. The denitration assembly 20 comprises a denitration flue section 21, a catalyst structure 23 and a soot-blowing structure 24, the catalyst structure 23 is arranged in the denitration flue section 21, and the soot-blowing structure 24 is arranged corresponding to the catalyst structure 23. The first end of the pre-dust removal assembly 10 is in communication with the flue outlet of the biomass boiler, the second end of the pre-dust removal assembly 10 is in communication with the first end of the denitration flue section 21, the outlet at the bottom of the pre-dust removal assembly 10 is in communication with the dust collection assembly, and the second end of the denitration flue section 21 is in communication with the economizer assembly 40.
[0032] By applying the technical scheme of the embodiment, the flue gas enters the pre-dust removal assembly 10 for dust removal from the biomass boiler 30, so that the catalyst structure 23 is not easily covered by a large amount of dust during subsequent denitration work, and the flue gas treatment effect is better. In addition, after dust removal, the catalyst structure 23 is also not easy to be poisoned, and the flue gas treatment effect is improved. The denitration is performed by combining the pre-dust removal assembly 10 and the SCR catalyst process, which reduces the SNCR device of the SNCR and SCR catalyst process in the prior art, so that the device reduces the floor area. The technical scheme of the embodiment effectively solves the problem of large floor area of the biomass boiler denitration mechanism in the prior art.
[0033] It should be noted that the end of the biomass boiler denitration mechanism is provided with a negative pressure device, such as a drainage fan, which discharges the gas in the biomass filtration denitration device to the economizer assembly 40, and the treated flue gas is discharged through the economizer assembly 40. The first end of the pre-dust removal assembly 10 is in communication with the flue outlet of the biomass boiler, which can be directly communicated or indirectly communicated. The embodiment is indirectly communicated, that is, communicated through other structures, such as communicated through a superheater assembly.
[0034] As Figure 1 and Figure 2As shown, in the technical scheme of the embodiment, the pre-dedusting assembly 10 comprises a pre-dedusting flue section 11, a pre-dedusting structure 12 and a slag conveying structure 13. The first end of the pre-dedusting flue section 11 is in communication with the flue outlet of the biomass boiler. The second end of the pre-dedusting flue section 11 is in communication with the first end of the denitration flue section 21. The slag conveying structure 13 is in communication with the ash outlet of the sidewall of the pre-dedusting flue section 11. The pre-dedusting structure 12 is arranged in the pre-dedusting flue section 11 and corresponds to the ash outlet of the sidewall of the pre-dedusting flue section 11. The arrangement of the pre-dedusting flue section 11 makes the arrangement of the pre-dedusting structure 12 more flexible and convenient. The pre-dedusting structure 12 can also be arranged directly, for example, the air inlet of the pre-dedusting structure 12 is in communication with the upstream biomass boiler 30. The air outlet of the pre-dedusting structure 12 is in communication with the denitration assembly 20. The ash outlet of the pre-dedusting structure 12 is in communication with the smoke dust collecting assembly.
[0035] In the technical scheme of Embodiment One, the pre-dedusting structure 12 comprises a cyclone. The cyclone comprises a separation cylinder 121 and an air outlet cylinder 122. The air outlet cylinder 122 is at least partially arranged in the separation cylinder 121. The separation cylinder 121 has a separation cylinder 121 inlet and a separation cylinder 121 outlet. The separation cylinder 121 inlet is located at the upper sidewall of the separation cylinder 121. The separation cylinder 121 outlet is located at the bottom of the separation cylinder 121. The inner wall surface of the separation cylinder 121 inlet has a downward spiral guide arc. The lower end of the air outlet cylinder 122 is located in the separation cylinder 121. The upper end of the air outlet cylinder 122 is located outside the separation cylinder 121. The gas and the smoke dust are separated by the cyclone. Thus, a special separation power mechanism does not need to be arranged. Such a separation structure is compact and saves energy. The gas mixture forms spiral motion between the separation cylinder 121 and the air outlet cylinder 122. The centrifugal forces of the gas and the solid of the gas mixture are different, so that the gas and the solid are separated. The gas is discharged through the air outlet cylinder. The solid is discharged through the outlet at the bottom of the separation cylinder 121. The inner wall surface of the separation cylinder 121 inlet has a downward spiral guide arc. Thus, the gas mixture enters to form spiral motion. It should be noted that the guide arc is at the end of the separation cylinder 121 inlet. Such processing cost is lower. The inner wall surface of the separation cylinder 121 inlet has a downward spiral guide arc. The structure at this position can form a guide arc by the inner wall structure of the separation cylinder 121 itself or by arranging an arc plate.
[0036] As Figure 2As shown, in the technical solution of Embodiment 1, the separation cylinder 121 includes a cylindrical section and a conical section. The lower end of the cylindrical section is connected to the upper end of the conical section. The diameter of the conical section gradually decreases from top to bottom. The lower end of the conical section has an ash outlet. The central axis of the gas outlet cylinder 122 coincides with the central axis of the separation cylinder 121, and the lower end of the gas outlet cylinder 122 is at a predetermined distance from the inner wall of the conical section. The arrangement of the cylindrical and conical sections allows for the staged separation of the gas mixture. In the initial stage when the gas mixture (unseparated flue gas) enters the separation cylinder 121, the space in the cylindrical section is relatively large, and the flow of the gas mixture is relatively gentle. After entering the conical section, the flow velocity of the gas mixture gradually increases, thus improving the separation effect of the gas mixture. It should be noted that, combined with... Figure 1 and Figure 2 It can be seen that the ash outlet at the lower end of the conical section is connected to the slag conveying structure 13. The slag conveying structure 13 transports dust and other substances to the dust collection component. The slag conveying structure 13 is a slag conveying pipeline.
[0037] In the technical solution of Embodiment 1, the pre-dust removal structure 12 includes a partition plate with multiple mounting holes and multiple cyclones. The inlet of the separation cylinder 121 of the multiple cyclones is connected to the mounting holes of the partition plate one-to-one. This structural arrangement results in better separation efficiency, better separation effect, and stronger separation order.
[0038] like Figure 1 As shown, in the technical solution of Embodiment 1, the pre-dust removal structure 12 also includes an inlet / outlet partition plate located within the pre-dust removal flue section 11, dividing the pre-dust removal flue section 11 into an inlet space and an outlet space. The upper end of the outlet cylinder 122 is located within the outlet space, which is connected to the denitrification flue section 21. The simultaneous arrangement of the inlet and outlet spaces within the pre-dust removal flue section 11 makes the structure more compact. The inlet and outlet spaces are isolated from each other and do not affect each other, thus preventing cross-contamination between the unseparated flue gas and the separated flue gas. It should be noted that there can be one or more inlet / outlet partition plates, whose main function is to divide the pre-dust removal flue section 11 into an inlet space and an outlet space, ensuring that the flue gas can only enter the denitrification flue section 21 after being separated by cyclones. Specifically, the upper part of the second end of the pre-dust removal flue section 11 is the outlet.
[0039] like Figure 4 As shown, in the technical solution of Embodiment 1, the soot blowing structure 24 is an acoustic soot blower. At least two acoustic soot blowers correspond to the catalyst structure 23 in the same layer. Adjacent acoustic soot blowers are parallel, and their outlets are staggered. When the working part of the acoustic soot blower rotates and blows along the axis, adjacent acoustic soot blowers can clean each other's accumulated ash.
[0040] As can be seen from the above, the biomass boiler denitration mechanism of the embodiment one realizes the standard emission of nitrogen oxides by using the medium-high temperature SCR catalyst process. In order to realize the continuous and stable operation of the medium-high temperature catalyst, the pre-dedusting device (pre-dedusting assembly 10) is specially added at the front end of the catalyst (catalyst structure 23) in the embodiment. The pre-dedusting assembly 10 is of an internal type, and the pre-dedusting can adopt various types such as a settling chamber and a tank type separator. The embodiment adopts the cyclone principle for separation. The main purpose is to remove most of the smoke dust in the flue gas before the flue gas enters the medium-high temperature catalyst, effectively prevent the catalyst from being fouled and alkali metal poisoning, and ensure the stable operation of the catalyst.
[0041] The reducing agent adopts urea or ammonia solution which is sprayed out through the outlet of the denitration agent spraying assembly 50. The high-temperature flue gas of the boiler first enters the pre-dedusting device and then enters the medium-high temperature catalyst. The smoke temperature entering the catalyst is about 300-420℃, which is the best temperature for the medium-high temperature catalyst reaction (the temperature can be monitored and controlled and adjusted). The catalyst selects the catalyst that prevents alkali metal poisoning. After the nitrogen oxides pass through the medium-high temperature catalyst, the standard emission of nitrogen oxides is realized.
[0042] The high-temperature flue gas of the boiler furnace flows from the first heating surface 321 (part of the superheater assembly 32) to the transition flue 33. The transition flue 33 and the pre-dedusting assembly 10 are connected. The transition flue 33 and the pre-dedusting assembly 10 can adapt to the high-temperature flue gas of 300-420℃. That is, the high-temperature flue gas first removes most of the smoke dust through the pre-dedusting structure 12 and then enters the first layer of medium-high temperature catalyst in the rear. At the same time, the ammonia water spraying device (denitration agent spraying assembly 50) at the inlet of the medium-high temperature catalyst sprays the reducing agent ammonia water. The high-efficiency denitration is realized by the first layer of medium-high temperature catalyst and the second layer of medium-high temperature catalyst.
[0043] In order to ensure the uniform flow distribution of the flue gas between the first heating surface 321 and the pre-dedusting structure 12, the guide plate (first flue gas guide structure 34) is arranged at the inlet of the pre-dedusting assembly 10 in the transition flue 33, which ensures the uniform flow of the high-temperature flue gas into the pre-dedusting assembly 10.
[0044] After most of the smoke dust in the flue gas is removed by the pre-dedusting assembly 10, the flue gas is directly discharged to the slag conveying device (flue dust collecting assembly) through the lower slag conveying structure 13.
[0045] In order to ensure the uniform flow of the high-temperature flue gas into the first layer of medium-high temperature catalyst, the medium-high temperature catalyst inlet guide plate (second flue gas guide structure 26) and the flow regulating grid (flow regulating grid structure 25) are respectively arranged at the upper part of the first layer of medium-high temperature catalyst. That is, the high-temperature flue gas from the outlet of the pre-dedusting assembly 10 to the first layer of medium-high temperature catalyst passes through two stages of uniform flow, which ensures the uniformity of the flue gas in the entire cross-sectional passage before entering the first layer of medium-high temperature catalyst.
[0046] The high-temperature catalyst in the example is selected as a honeycomb type, and two layers are arranged according to the design of the denitration efficiency to ensure that the outlet nitrogen oxide emission concentration is ≤50 mg / Nm3, which are a first layer of high-temperature catalyst layer and a second layer of high-temperature catalyst layer. In order to prevent the accumulation of ash on the surface of the catalyst, a first layer of high-temperature catalyst upper soot blower (soot blowing structure 24) is arranged on the upper part of the first layer of high-temperature catalyst, and a second layer of high-temperature catalyst upper soot blowing structure 24 is arranged on the upper part of the second layer of high-temperature catalyst.
[0047] The high-temperature flue gas after efficient denitration flows through the lower second heating surface 41 and enters the tail heating surface, realizing the standard emission of nitrogen oxides.
[0048] The design of the embodiment avoids the short-term plugging and failure of the catalyst caused by ash accumulation and poisoning in the application process of the high-temperature catalyst used in the biomass boiler on the market at present, ensures the continuous operation of the catalyst, and greatly improves the ammonium bisulfate deposition and ash accumulation in the tail heating surface caused by the spraying of a large amount of urea or ammonia water solution into the furnace.
[0049] The technical scheme of the second embodiment is different from that of the first embodiment in that a spiral plate is arranged between the separation cylinder 121 and the gas outlet cylinder 122, which can realize the separation of the gas and the solid of the gas mixture, but the smoke dust is easy to accumulate on the spiral plate and needs to be cleaned regularly.
[0050] The technical scheme of the third embodiment is different from that of the first embodiment in that the soot blowing structure 24 is a steam soot blower.
[0051] The technical scheme of the fourth embodiment is different from that of the first embodiment in that the soot blowing structure 24 is a combination of a sonic soot blower and a steam soot blower.
[0052] The technical scheme of the fifth embodiment is different from that of the first embodiment in that the denitration medicament injection assembly 50 is arranged in the biomass boiler 30. The reducing agent (urea, ammonia water solution or other reducing agent) is injected through the denitration medicament injection assembly 50.
[0053] The technical solution of the embodiment six is different from the technical solution of the embodiment one in that the outlet of the denitration reagent injection assembly 50 is arranged in the denitration flue section 21, and the outlet of the denitration reagent injection assembly 50 is arranged in the biomass boiler 30, that is, the denitration flue section 21 and the biomass boiler 30 are both provided with the outlet of the denitration reagent injection assembly 50. It should be noted that the structure can be selected according to the process requirement to separately open the denitration reagent injection assembly 50 in the biomass boiler 30 for injection, or separately open the denitration reagent injection assembly 50 in the denitration flue section 21 for injection, or simultaneously open the denitration reagent injection assemblies 50 in the biomass boiler 30 and the denitration flue section 21.
[0054] According to another aspect of the present application, a biomass boiler device is also provided, which comprises a biomass boiler 30, a biomass boiler denitration mechanism and an economizer assembly 40, the biomass boiler denitration mechanism being connected between the biomass boiler 30 and the economizer assembly 40, and the biomass boiler denitration mechanism being the above-mentioned biomass boiler denitration mechanism. The biomass boiler device further comprises a tail end desulfurization assembly and a chimney, which are not described herein again. The biomass boiler 30 comprises a boiler body 31, a superheater assembly 32 and a transition flue 33, the smoke outlet of the boiler body 31 is connected with the first end of the transition flue 33 through the superheater assembly 32, the second end of the transition flue 33 is connected with the pre-dust removal assembly 10, the end of the transition flue 33 close to the pre-dust removal assembly 10 is provided with a first flue gas guide structure 34, and the end of the denitration flue section 21 close to the pre-dust removal assembly 10 is provided with a second flue gas guide structure 26. The first flue gas guide structure 34 and the second flue gas guide structure 26 are guide arc-shaped plates. Because the flue section of the superheater assembly 32 is vertically arranged, the pre-dust removal flue section 11 is horizontally arranged, the transition flue 33 is at least partially arc-shaped arranged, and the denitration flue section 21 is vertically arranged, the gas mixture is easy to generate large resistance loss when turning, and the flue gas mixture is relatively disordered. The first flue gas guide structure 34 and the second flue gas guide structure 26 are arranged to make the flow resistance of the flue gas mixture small and the flow relatively ordered. The denitration assembly 20 further comprises a rectifying grid structure 25, which is arranged in the interior of the denitration flue section 21 and located between the second flue gas guide structure 26 and the catalyst structure 23. As an embodiment of the biomass boiler device of the present application, the denitration reducing agent injection structure is arranged in the hearth of the boiler body 31. As another embodiment of the biomass boiler device of the present application, the denitration reducing agent injection structure is not arranged in the hearth of the boiler body 31.
[0055] 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.
[0056] 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
[0057] The only limitation of the application is set forth in the accompanying claims and the application encompasses modifications and variations of the preferred embodiments thereof as come within the scope of the appended claims. It is intended that the specification and figures be considered as illustrative only and not restrictive in character. It is therefore wished to be protected in the full scope by the appended claims and their equivalents.
Claims
1. A biomass boiler denitration mechanism, characterized in that, The application relates to a biomass boiler flue gas denitration device. The device comprises: a pre-dedusting assembly (10); a denitration assembly (20) comprising a denitration flue section (21), a catalyst structure (23) arranged in the denitration flue section (21), and a soot-blowing structure (24) arranged in correspondence with the catalyst structure (23); 2. The biomass boiler denitration mechanism according to claim 1, characterized in that, a first end of the pre-dedusting assembly (10) is in communication with a flue outlet of a biomass boiler, a second end of the pre-dedusting assembly (10) is in communication with a first end of the denitration flue section (21), an outlet at the bottom of the pre-dedusting assembly (10) is in communication with a dust collection assembly, and a second end of the denitration flue section (21) is in communication with an economizer assembly (40).
3. The biomass boiler denitration mechanism according to claim 2, characterized in that, The pre-dedusting assembly (10) comprises a pre-dedusting flue section (11), a pre-dedusting structure (12), and a slag conveying structure (13), a first end of the pre-dedusting flue section (11) is in communication with a flue outlet of a biomass boiler, a second end of the pre-dedusting flue section (11) is in communication with a first end of the denitration flue section (21), the slag conveying structure (13) is in communication with a dust outlet of a side wall of the pre-dedusting flue section (11), and the pre-dedusting structure (12) is arranged in the pre-dedusting flue section (11) and in correspondence with the dust outlet of the side wall of the pre-dedusting flue section (11).
4. The biomass boiler denitration mechanism according to claim 3, characterized in that, The pre-dedusting structure (12) comprises a cyclone, the cyclone comprises a separation cylinder (121) and a gas outlet cylinder (122), the gas outlet cylinder (122) is arranged at least partially in the separation cylinder (121), the separation cylinder (121) has a separation cylinder (121) inlet and a separation cylinder (121) outlet, the separation cylinder (121) inlet is located at an upper side wall of the separation cylinder (121), the separation cylinder (121) outlet is located at the bottom of the separation cylinder (121), an inner wall surface of the separation cylinder (121) inlet has a spiral downward guide arc, a lower end of the gas outlet cylinder (122) is located in the separation cylinder (121), and an upper end of the gas outlet cylinder (122) is located outside the separation cylinder (121).
5. The biomass boiler denitration mechanism according to claim 3, characterized in that, The separation cylinder (121) comprises a cylindrical section and a conical section, a lower end of the cylindrical section is in communication with an upper end of the conical section, in a direction from top to bottom, the diameter of the conical section gradually shrinks, a lower end of the conical section has a dust outlet, a central axis of the gas outlet cylinder (122) coincides with a central axis of the separation cylinder (121), and a lower end of the gas outlet cylinder (122) has a predetermined distance from an inner wall of the conical section. The pre-dedusting structure (12) comprises a partition plate, a plurality of mounting holes are arranged on the partition plate, the cyclone is in plurality, and the separation cylinder (121) inlets of the plurality of cyclones are in one-to-one correspondence with the mounting holes of the plurality of partition plates.
6. The biomass boiler denitration mechanism according to claim 3, characterized in that, The pre-dedusting structure (12) further comprises an inlet-outlet air partition plate located in the pre-dedusting flue section (11) to divide the pre-dedusting flue section (11) into an inlet air space and an outlet air space, the upper end of the outlet air cylinder (122) being located in the outlet air space, and the outlet air space being in communication with the denitration flue section (21).
7. The biomass boiler denitration mechanism according to any one of claims 1 to 6, characterized in that, The soot blowing structure (24) is an acoustic soot blower, a steam soot blower, or an acoustic soot blower combined with a steam soot blower.
8. The biomass boiler denitration mechanism according to any one of claims 1 to 6, characterized in that, The biomass boiler denitration mechanism further comprises a denitration agent injection assembly (50), the outlet of the denitration agent injection assembly (50) being arranged in the denitration flue section (21) and / or in the biomass boiler (30).
9. A biomass boiler apparatus, characterized by The biomass boiler device comprises a biomass boiler (30), a biomass boiler denitration mechanism, and an economizer assembly (40), the biomass boiler denitration mechanism being connected between the biomass boiler (30) and the economizer assembly (40), and the biomass boiler denitration mechanism being the biomass boiler denitration mechanism according to any one of claims 1 to 8.
10. The biomass boiler apparatus of claim 9, wherein, The biomass boiler (30) comprises a boiler body (31), a superheater assembly (32), and a transition flue (33), the smoke outlet of the boiler body (31) being in communication with the first end of the transition flue (33) through the superheater assembly (32), the second end of the transition flue (33) being in communication with the pre-dedusting assembly (10), and the end of the transition flue (33) close to the pre-dedusting assembly (10) having a first flue gas flow guide structure (34), and the end of the denitration flue section (21) close to the pre-dedusting assembly (10) having a second flue gas flow guide structure (26).