High-efficiency low-resistance medium-fine particle fly ash removal device used before denitration

Abstract

The invention relates to the technical field of denitration, in particular to a high-efficiency low-resistance medium-fine particle fly ash removal device before denitration, which comprises a flowing unit, a denitration unit and a denitration unit, the dust collecting unit comprises a first dust collecting unit body outer pipe arranged in the flowing air pipe, a first dust collecting unit body inner pipe arranged in the flowing air pipe, a second dust collecting unit body inner pipe arranged on one side of the first dust collecting unit body inner pipe and a second dust collecting unit body outer pipe arranged on the second dust collecting unit body inner pipe; the guide unit is arranged in the first outer pipe of the ash collecting unit, so that flue gas passes through the guide unit and is guided to rotate by the guide fan blades on the outer side of the bearing fixing block, fly ash in the flue gas is thrown to the inner wall of the first outer pipe of the ash collecting unit, and particulate matters in the flue gas are enriched on the inner wall of the first outer pipe of the ash collecting unit; and the flue gas flows to an inner channel of the inner pipe of the ash collecting unit body with smaller resistance, so that particulate matters in the flue gas are separated out, and the problem that the high-efficiency low-resistance medium-fine particle fly ash removal device cannot efficiently collect fly ash with the particle size of 50-200 microns before denitration is solved.

Description

Technical Field

[0001] The present invention relates to a technical field, and in particular to a device for removing medium and fine particle fly ash with high efficiency and low resistance before denitration. Background Art

[0002] As of the beginning of 2024, my country's coal-fired power generation installed capacity is about 1.4 billion kilowatts, with more than 3,000 units. From the moment the coal-fired flue gas enters the furnace after the economizer, it passes through the SCR denitrification device, air preheater, low-temperature economizer, dust collector and other systems, all of which are in high-dust areas. Fly ash wear and ash accumulation problems are very common. According to incomplete statistics, the annual losses of coal-fired power generation units across the country due to fly ash wear and ash accumulation are more than 10 billion yuan. Due to coal quality and combustion and other reasons, the dust concentration of many coal-fired boilers is high, with more coarse particles, and its erosion and wear are significantly increased, which is an important cause of equipment wear in the high-dust area after the furnace.

[0003] From the moment the coal-fired flue gas enters the furnace after the economizer, it passes through the SCR denitration device, air preheater, low-temperature economizer, dust collector and other systems, all of which are in a high-dust area. Fly ash erosion, wear and ash accumulation are very common, with wear and breakage of the struts in the flue, serious deformation of the support beams, cracking and even collapse of the flue, and collapse of the ash hopper. Most of the fly ash from coal-fired units contains a large amount of fly ash with a particle size of around 100um and fine particles (around 50um). This will further improve the collection capacity of flue gas fly ash before denitration, reduce the wear of medium and fine particles and above on downstream flue internals and equipment, and improve the problem of serious ash accumulation in the flue during low-load peak regulation of the boiler. At the same time, it will greatly reduce the burden on the dust collector and its ash conveying system, eliminate the structural safety risks of the flue and ash hopper, and effectively ensure the safe, economical and stable operation of environmental protection facilities, making contributions to energy conservation and emission reduction in the power industry. Summary of the invention

[0004] In view of the problems existing in the above-mentioned existing high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification, the present invention is proposed.

[0005] Therefore, the present invention provides a high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitrification, the purpose of which is to solve the problem that the high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitrification cannot efficiently collect fly ash with a particle size between 50um and 200um.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: including a flow unit, including a flow air pipe; an ash collecting unit, including an ash collecting unit external tube 1 arranged in the flow air pipe, an ash collecting unit internal tube 1 arranged in the flow air pipe, an ash collecting unit internal tube 2 arranged on one side of the ash collecting unit internal tube 1, and an ash collecting unit external tube 2 arranged on the ash collecting unit internal tube 2; and a guide unit, including a bearing and fixing block arranged in the ash collecting unit external tube 1, and a guide blade arranged on the bearing and fixing block.

[0007] As a preferred solution of the high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitrification described in the present invention, at least two groups of fly ash collection pipes are provided at the bottom of the flow air pipe, and the shapes of the fly ash collection pipes vary in their different installation positions.

[0008] As a preferred solution of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification described in the present invention, a collecting unit is provided at the bottom of the flow air pipe.

[0009] As a preferred solution of the high-efficiency, low-resistance, medium and fine particle fly ash removal device before denitrification described in the present invention, the collection unit includes a collection plate arranged at the bottom of the flow air pipe, a guide slope arranged in the collection plate, a slot opened on the guide slope, and an ash discharge plate arranged on one side of the collection plate.

[0010] As a preferred solution of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification described in the present invention, the inclination angle of the top of the guide slope is between 60° and 90°.

[0011] As a preferred solution of the high-efficiency, low-resistance and medium-fine particle fly ash removal device before denitrification described in the present invention, a fly ash guide block 1 is provided on the outside of the tube 1 in the ash collecting unit body, and a fly ash guide block 2 corresponding to the fly ash guide block 1 is provided on the outside of the tube 2 in the ash collecting unit body.

[0012] As a preferred solution of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification described in the present invention, a closed combination plate 1 is provided on the top of the outer tube 1 of the ash collecting unit body, and a closed combination plate 2 corresponding to the closed combination plate 1 is provided on the top of the outer tube 2 of the ash collecting unit body.

[0013] As a preferred solution of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification described in the present invention, at least two groups of connecting grooves are provided on the outer side surface of the bearing fixed block.

[0014] As a preferred solution of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification described in the present invention, the inside of the guide fan blade is provided with a fixing bolt corresponding to the bearing fixing block, and the bearing fixing block is provided with a focusing block.

[0015] As a preferred solution of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification described in the present invention, both ends of the guide blades are arc-shaped, and the shape of the focusing block is hemispherical.

[0016] The beneficial effects of the present invention are as follows: by arranging a guide unit inside the outer tube of the ash collecting unit, the flue gas passes through the guide unit and is guided by the guide blades on the outside of the supporting fixed block to form an effective rotation. Since the inertia force of fly ash in the flue gas is relatively large, most of the fly ash is thrown to and enriched on the inner wall of the outer tube of the ash collecting unit, and enters the gap between the outer tube of the ash collecting unit and the inner tube of the ash collecting unit under the action of gravity, and then enters the fly ash collecting pipe. Since the resistance of the fly ash collecting pipe is relatively large, the flue gas flows into a channel with relatively small resistance and enters the internal channel of the inner tube 203 of the ash collecting unit, thereby separating the medium and fine particles in the flue gas, thereby solving the problem that the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification cannot efficiently collect fly ash with a particle size between 50um and 200um. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the high-efficiency, low-resistance, medium and fine particle fly ash removal device before denitrification of the present invention.

[0019] Figure 2 It is a schematic diagram of the flow unit structure of the high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the ash collecting unit of the device for removing medium and fine particle fly ash with high efficiency and low resistance before denitrification according to the present invention.

[0021] Figure 4 This is a structural cross-sectional view of an external tube of the ash collecting unit of the device for removing medium and fine particle fly ash with high efficiency and low resistance before denitrification according to the present invention.

[0022] Figure 5 It is a schematic diagram of the guide unit structure of the device for removing medium and fine particle fly ash with high efficiency and low resistance before denitrification according to the present invention.

[0023] Figure 6 This is a structural diagram of Embodiment 2 of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the collection unit of the device for removing medium and fine particle fly ash with high efficiency and low resistance before denitrification according to the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] Example 1, reference Figure 1 - Figure 5 , which is the first embodiment of the present invention, provides a high-efficiency and low-resistance medium and fine particle fly ash removal device before denitrification, the device comprising a flow unit 100, including a flow air pipe 101; an ash collecting unit 200, including an ash collecting unit external tube 1 201 arranged in the flow air pipe 101, an ash collecting unit internal tube 1 203 arranged in the flow air pipe 101, an ash collecting unit internal tube 207 arranged on one side of the ash collecting unit internal tube 1 203, and an ash collecting unit external tube 206 arranged on the ash collecting unit internal tube 207; and a guide unit 300, including a bearing and fixing block 301 arranged in the ash collecting unit external tube 1 201, and a guide fan blade arranged on the bearing and fixing block 301 303, the flue gas entering the outer tube 201 of the ash collecting unit is guided and rotated by the guide blades 303, so that the ash-containing flue gas rotates strongly. Due to the different inertia forces of flue gas and fly ash, the inertia force of fly ash in flue gas is larger, and it is thrown to the inner wall of the outer tube 201 of the ash collecting unit, so that the particulate matter in the flue gas adheres and is enriched on the inner wall of the outer tube 201 of the ash collecting unit. Affected by the resistance, the flue gas will flow to the channel with smaller resistance, that is, the inner tube channel 203 of the ash collecting unit, and then carry out the subsequent work process, so as to form an efficient collection of fly ash in the flue gas, thereby reducing the wear of particulate fly ash on the downstream flue internals and equipment, and at the same time improving the problem of serious ash accumulation in the flue caused by flue gas fly ash deposition during low-load peak regulation of the boiler.

[0030] Among them, at least two groups of fly ash collection pipes 102 are provided at the bottom of the flow air pipe 101, and the shape of the fly ash collection pipes 102 changes in its different installation positions. Multiple groups of fly ash collection pipes 102 are installed at the bottom of multiple groups of ash collecting unit body tubes 1 203 and ash collecting unit body tubes 207, so as to collect and transport the particulate matter separated from the flue gas.

[0031] Among them, a fly ash guide block 205 is provided on the outer side of the inner tube 203 of the ash collecting unit, and a fly ash guide block 208 corresponding to the fly ash guide block 205 is provided on the outer side of the inner tube 207 of the ash collecting unit. By combining the fly ash guide block 205 and the fly ash guide block 208, particles falling into the gap between the inner tube 203 of the ash collecting unit and the inner tube 207 of the ash collecting unit will slide to both sides along the top of the two, thereby preventing the separated particles from accumulating in the contact gap between the inner tube 203 of the ash collecting unit and the inner tube 207 of the ash collecting unit.

[0032] Among them, the top of the ash collecting unit external tube 201 is provided with an ash collecting unit external tube 201, and the top of the ash collecting unit external tube 206 is provided with a closed combination plate 209 corresponding to the closed combination plate 202. The ash collecting unit external tube 201 and the closed combination plate 209 are used in combination, and the ash collecting unit external tube 201 and the closed combination plate 209 are connected to the inner wall of the flowing air pipe 101 at the same time, so as to close the upper part of the fly ash collection pipe 102 at the bottom of the ash collecting unit internal tube 1 203 and the ash collecting unit internal tube 2 207, thereby ensuring that all the ash-containing flue gas in the system enters the ash collecting unit, thereby efficiently collecting the flue gas fly ash.

[0033] During use, all ash collecting units are arranged in a large-section flue after the economizer before denitrification, and the overall flue gas flow rate is between 4m / s and 6m / s. At this time, the flue gas passes through four groups of guide units 300 and is guided by the guide blades 303 on the outside of the supporting fixed block 301 to form an effective rotation. Due to the large inertia force of fly ash in the flue gas, most of the fly ash is thrown to and enriched on the inner wall of the outer tube 201 of the ash collecting unit body. Since the resistance of the fly ash collection pipe is large, the flue gas flows into a channel with smaller resistance and enters the internal channel of the inner tube 203 of the ash collecting unit body, and enters the subsequent flue gas process along the internal channel of the inner tube 203 of the ash collecting unit body, thereby separating the medium and fine particles in the flue gas; at the same time, the particles enriched on the inner wall of the outer tube 201 of the ash collecting unit body The particles will flow downward along its inner wall due to its own gravity, and then enter the gap between the outer tube 201 of the ash collecting unit body and the top of the inner tube 203 of the ash collecting unit body, and fall along the gap to the outside of the inner tube 203 of the ash collecting unit body, and then the particles will continue to move downward along the outside of the inner tube 203 of the ash collecting unit body under the action of gravity. There are particles all around the inner tube 203 of the ash collecting unit body. The particles that fall on the fly ash guide block 205 will move downward along the top of the fly ash guide block 205, and then fall into the gap between the inner tube 203 of the ash collecting unit body and the inner tube 207 of the ash collecting unit body, that is, the fly ash collection pipe 102 installed at the bottom of multiple groups of inner tubes 203 of the ash collecting unit body and the inner tube 207 of the ash collecting unit body, that is, Figure 2 Similarly, the particles in the gap between the tube 1 203 in the ash collecting unit and the flow air pipe 101 will also fall into the fly ash collecting pipe 102, that is, Figure 2 The triangular fly ash collecting pipe 102 in the flue gas separates the fly ash particles in the flue gas and collects them centrally, and sends them to the ash conveying system for transportation, which reduces the cost of gas-solid separation. At the same time, the separated flue gas will flow along the internal channel of the tube 203 in the ash collecting unit and continue to enter the subsequent flue gas system, thereby reducing the wear of the particle fly ash on the downstream flue internals and equipment, and at the same time improving the serious ash accumulation problem in the flue caused by fly ash deposition during low-load peak-shaving of the boiler.

[0034] Example 2, reference Figure 1 Reference Figure 1 - Figure 7, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that a collecting unit 400 is provided at the bottom of the flowing air pipe 101. The collecting unit 400 includes a collecting plate 401 arranged at the bottom of the flowing air pipe 101, a guiding slope 402 arranged in the collecting plate 401, a slot 403 opened on the guiding slope 402, and an ash discharge plate 404 arranged on one side of the collecting plate 401. The collecting plate 401 is wrapped around the outer side of the bottom of the flowing air pipe 101, so as to collect the particulate matter that falls on the outer side of the tube 203 in the ash collecting unit body, so as to facilitate the staff to recycle and clean the particulate matter, thereby increasing the comfort of the staff.

[0035] Compared with Example 1, the inclination angle of the top of the guide slope 402 is further between 60° and 90°, so that the particles falling into the collection plate 401 in the fly ash collection pipe 102 will move toward the ash discharge plate 404 along the slope of the guide slope 402 under the action of gravity.

[0036] During use, multiple groups of ash collecting unit internal tube 1 203 and ash collecting unit internal tube 207 will pass through the collecting plate 401 and be plugged into each other in the slot 403, so that the collecting plate 401 is wrapped around the bottom outer side of the flowing air pipe 101, so that the particles along the gap between the ash collecting unit external tube 1 201 and the ash collecting unit internal tube 1 203 will be collected by the collecting plate 401 when they fall downward. At this time, the particles will accumulate on the guide slope 402 in the collecting plate 401, and the angle between the guide slope 402 and the horizontal plane is between 60° and 90°, so that the particles accumulated on the guide slope 402 The particles will move along its inclined surface toward the ash outlet plate 404, and then fall out from the ash outlet plate 404 to be collected again for recycling, thereby reducing the cost of flue gas separation; at the same time, when the flue gas collides with the inner wall of the outer tube 201 of the ash collecting unit, part of the flue gas will enter the collecting plate 401 along the gap between the outer tube 201 of the ash collecting unit and the inner tube 203 of the ash collecting unit along with the particles, so that this part of the flowing flue gas will drive the particles accumulated on the guide inclined surface 402 to move toward the ash outlet plate 404 and be collected, thereby reducing the particles accumulated on the guide inclined surface 402.

[0037] The remaining structures are the same as those of Example 1.

[0038] Example 3, reference Figure 1 - Figure 7, which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: at least two groups of connecting grooves 302 are provided on the outer side of the supporting and fixing block 301, and fixing bolts 304 corresponding to the supporting and fixing block 301 are provided inside the guide blades 303. A focusing block 305 is provided on the supporting and fixing block 301. Through multiple groups of connecting grooves 302, the staff can adjust the angle of the guide blades 303 according to the flow speed and system resistance of the flue gas in the flowing air pipe 101, so that the flue gas passing through the guide blades 303 can form an effective rotation, and most of the medium and fine particles of fly ash are thrown to the inner wall of the outer tube 201 of the ash collecting unit, and the flue gas flows to the inner channel 203 of the inner tube of the ash collecting unit with smaller resistance. Because the particulate matter in the flue gas is enriched on the inner wall of the outer tube 201 of the ash collecting unit due to the large inertia force, the particulate matter in the flue gas entering the inner tube 203 of the ash collecting unit is reduced.

[0039] Compared with Example 2, both ends of the guide blades 303 are arc-shaped, and the shape of the focusing block 305 is hemispherical. The hemispherical focusing block 305 reduces the smoke flow resistance, so that the smoke can pass through the guide blades 303 and effectively throw it to the inner wall of the outer tube 201 of the ash collecting unit body, so that the fly ash particles in the smoke are enriched on the inner wall of the outer tube 201 of the ash collecting unit body, thereby reducing the resistance of the focusing block 305 during the smoke flow process.

[0040] During use, the staff sets the arrangement angle of the guide blades 303 according to the flow speed of the flue gas in the flow air pipe 101 and the system resistance, installs it in the connecting groove 302, and fixes it with the fixing bolts 304, so that the ash-containing flue gas guided by the guide blades 303 can effectively rotate and be thrown toward the inner wall of the outer tube 201 of the ash collecting unit. Since the inertia force of fly ash is large and the resistance of the ash collecting channel is large, the flue gas entering the gap between the outer tube 201 of the ash collecting unit and the inner tube 203 of the ash collecting unit is reduced, and the flue gas is prevented from overflowing into the atmosphere and polluting it. At the same time, the particulate matter that flows with the flow direction of the flue gas and enters the channel of the inner tube 203 of the ash collecting unit is reduced, and the wear of the downstream flue internal parts and equipment by the particulate fly ash is further reduced. At the same time, the problem of serious ash accumulation in the flue caused by the deposition of flue gas fly ash during low-load peak regulation of the boiler is improved; The flue gas entering the flow air pipe 101 will be diverted and guided by the eight groups of guide blades 303 on the outside of the supporting fixed block 301, so that the flue gas is thrown to the inner wall of the outer tube 201 of the ash collecting unit, thereby enriching the particulate matter in the flue gas on the inner wall of the outer tube 201 of the ash collecting unit, and the flue gas flows to the internal channel of the inner tube 203 of the ash collecting unit due to the large resistance of the fly ash channel, and enters the subsequent process, and the particulate matter enriched on the inner wall of the outer tube 201 of the ash collecting unit will slide downward along the inner wall of the outer tube 201 of the ash collecting unit under the action of gravity, and the particulate matter passes through the gap between the outer tube 201 of the ash collecting unit and the inner tube 203 of the ash collecting unit, and falls into the fly ash collecting pipe 102 at the bottom of multiple groups of inner tubes 203 and 207 of the ash collecting unit, and then the particulate matter is collected through the fly ash collecting pipe 102 and transported into the ash conveying system to the fly ash storage site.

[0041] The remaining structure is the same as that of Example 2.

[0042] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0043] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitrification, characterized in that: include, A flow unit (100) comprising a flow air pipe (101); The ash collecting unit (200) comprises an outer tube (201) of the ash collecting unit disposed in the flow air pipe (101), an inner tube (203) of the ash collecting unit disposed in the flow air pipe (101), an inner tube (207) of the ash collecting unit disposed on one side of the inner tube (203) of the ash collecting unit, and an outer tube (206) of the ash collecting unit disposed on the inner tube (207) of the ash collecting unit; and The guide unit (300) comprises a bearing and fixing block (301) arranged in an outer tube (201) of the dust collecting unit, and a guide fan blade (303) arranged on the bearing and fixing block (301).

2. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 1 is characterized in that: At least two groups of fly ash collection pipes (102) are arranged at the bottom of the flow air pipe (101), and the shapes of the fly ash collection pipes (102) vary at different installation positions.

3. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 1 is characterized in that: A collecting unit (400) is provided at the bottom of the flow air pipe (101).

4. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 3 is characterized in that: The collection unit (400) comprises a collection plate (401) arranged at the bottom of the flow air pipe (101), a guide slope (402) arranged inside the collection plate (401), a slot (403) opened on the guide slope (402), and a ash discharge plate (404) arranged on one side of the collection plate (401).

5. The device for removing medium and fine particles of fly ash with high efficiency and low resistance before denitration according to any one of claim 4, characterized in that: The inclination angle of the top of the guiding inclined surface (402) is between 60° and 90°.

6. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 5 is characterized in that: A fly ash guide block 1 (205) is provided on the outer side of the inner tube 1 (203) of the ash collecting unit, and a fly ash guide block 2 (208) corresponding to the fly ash guide block 1 (205) is provided on the outer side of the inner tube 2 (207) of the ash collecting unit.

7. The device for removing medium and fine particles of fly ash with high efficiency and low resistance before denitration according to claim 6 is characterized in that: A closed combination plate 1 (202) is provided on the top of the outer tube 1 (201) of the ash collecting unit body, and a closed combination plate 2 (209) corresponding to the closed combination plate 1 (202) is provided on the top of the outer tube 2 (206) of the ash collecting unit body.

8. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 7 is characterized in that: At least two groups of connection grooves (302) are provided on the outer side surface of the supporting fixing block (301).

9. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 8 is characterized in that: A fixing bolt (304) corresponding to the bearing fixing block (301) is provided inside the guide blade (303), and a focusing block (305) is provided on the bearing fixing block (301).

10. The high-efficiency, low-resistance, medium-fine particle fly ash removal device before denitration according to claim 9, characterized in that: Both ends of the guide blade (303) are arc-shaped, and the focusing block (305) is hemispherical in shape.

Images