A rectifier grid structure with adjustable angle in different areas

Abstract

The present invention provides a rectifying grille structure with adjustable angles in different zones, wherein a guide plate is arranged on the air inlet side of the rectifying grille structure, and a first layer of catalyst is arranged on the air outlet side. The rectifying grille structure is composed of a plurality of rectifying grille bodies which are symmetrically arranged and connected by support rods, and each rectifying grille body is provided with an angle adjustment connecting rod mechanism for adjusting the internal ventilation angle of the rectifying grille body on the side away from the support rod. The internal ventilation angle of each rectifying grille body can be adjusted respectively by the angle adjustment connecting rod mechanism, so as to realize the zoned adjustment of the amount of flue gas passing through different areas in the same cross-section. The invention can effectively solve the problem of uneven flow field at the catalyst inlet and reduce the large ammonia slip at the denitrification outlet. Moreover, the structure of the present invention is novel and unique, simple and reasonable, the flow field can be adjusted at any time by the angle adjustment connecting rod mechanism, and it is flexible and convenient to use, with good effect and good social and economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of denitration of coal-fired boilers in thermal power plants, and in particular to a rectifying grid structure capable of adjusting angles by partition. Background Art

[0002] In the current coal-fired boilers, most power plants currently use the SCR catalytic reduction method to remove NOx. This method requires a certain catalyst area to achieve the designed denitrification efficiency, so the width of the vertical flue begins to increase after the horizontal section of the flue at the rear of the economizer, and the area reaches the maximum at the upper part of the catalyst. After the flue begins to widen, the flue begins to increase near the outer side on both sides, and the flue structure near the middle does not change. After widening, the deviation between the outer and inner flue gas flow is large. The flue gas flow near the middle is large, and the flow near the outer flue is relatively small. Although the widened section of the flue is equipped with a guide plate, it still cannot completely solve the problem of uneven flow field. The flue has uneven flow field after widening. At the flue position above the catalyst, the size reaches its maximum value. In order to ensure the uniformity of the flow field, a rectifying grid is installed in the vertical section of the elbow corner. However, after passing through the rectifying grid, the flow field is still uneven. When the amount of ammonia sprayed is the same, the denitrification efficiency is higher in places with smaller flue gas volume, and the ammonia escape is larger, and vice versa. Due to the uneven distribution of the flow field in the flue, problems such as large local ammonia escape and air preheater blockage will occur, affecting the safe operation of the unit. Summary of the invention

[0003] The object of the present invention is to provide a rectifying grid structure with adjustable angles in different zones, so as to solve the problem of uneven distribution of flue gas flow field in the flue behind the rectifying grid.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a rectifying grid structure with adjustable angle in different zones, a guide plate is arranged on the air intake side of the rectifying grid structure, and a first layer of catalyst is arranged on the air outlet side. The rectifying grid structure is composed of a plurality of rectifying grid bodies which are symmetrically arranged and connected by support rods. Each rectifying grid body is provided with an angle adjustment connecting rod mechanism on the side away from the support rod for adjusting the internal ventilation angle of the rectifying grid body. The internal ventilation angle of each rectifying grid body can be adjusted separately through the angle adjustment connecting rod mechanism, so as to realize the zoned adjustment of the amount of flue gas passing through different areas in the same cross-section.

[0005] Furthermore, the rectifier grid body is a grid-like structure composed of multiple fixed partitions and multiple adjustable angle partitions, the multiple fixed partitions are fixedly connected to the support rods, and the multiple adjustable angle partitions are mounted on the top of the multiple fixed partitions and can swing left and right relative to the adjustable angle partitions.

[0006] Furthermore, an angle adjustment actuating rod is detachably connected to the inner side of the top of the adjustable angle partition along the length direction, and the ends of the plurality of angle adjustment actuating rods are commonly provided with the angle adjustment connecting rod mechanism.

[0007] Furthermore, the angle adjustment connecting rod mechanism includes an electric actuator, a transmission rod, and a plurality of wear-resistant parts of the same number as the angle adjustment connecting rod mechanism, each of the angle adjustment actuator rods is sleeved with one of the wear-resistant parts, and each of the angle adjustment actuator rods is sleeved with a connecting rod on the outside of the wear-resistant part, the free ends of the plurality of connecting rods are hinged on the transmission rod, and the end of one of the angle adjustment actuator rods is connected to the electric actuator.

[0008] Furthermore, the wear-resistant part is in the shape of a magnetic needle as a whole, which is wide in the middle and narrow at both ends, and the angle adjustment actuator rod passes through the end surface of the wear-resistant part along the center position.

[0009] Furthermore, at least one of the angle adjustment actuator rods is provided with a scale for displaying the rotation angle of the angle adjustment actuator rod.

[0010] Furthermore, the electric actuator includes but is not limited to a transmission mechanism consisting of a motor and a commutator.

[0011] Furthermore, the top of the fixed partition and the bottom of the adjustable angle partition are both provided with a plurality of through grooves that match each other and are used to enable the adjustable angle partition to swing left and right, and the thickness of the adjustable angle partition is smaller than the length of the through grooves provided on the fixed partition.

[0012] Furthermore, the height of the through slot provided on the adjustable angle partition is greater than the height of the through slot provided on the fixed partition.

[0013] Furthermore, the support rod is a rotatable structure, and bearings are provided at both ends of the support rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can adjust the internal ventilation angle of each rectifier grid body respectively through the angle adjustment connecting rod mechanism, so as to realize the zoning adjustment of the flue gas volume passing through different areas in the same cross-section. The invention can effectively solve the problem of uneven flow field at the catalyst inlet and reduce the large ammonia slip at the denitrification outlet. Moreover, the structure of the present invention is novel and unique, simple and reasonable. The flow field can be adjusted at any time through the angle adjustment connecting rod mechanism 5. It is flexible and easy to use, has good effect, and has good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the rectifying grid structure in the present invention;

[0017] Figure 3 It is a structural schematic diagram of the angle adjustment connecting rod mechanism in the present invention;

[0018] Figure 4 It is a schematic diagram of the positional relationship between the fixed partition and the angle-adjustable partition in the present invention;

[0019] Figure 5 It is a schematic diagram of the positional relationship between the adjustable angle partition and the angle adjustment actuator rod in the present invention;

[0020] Markings in the figure: 1. guide plate, 2. first layer catalyst, 3. support rod, 4. rectifier grid body, 401. fixed partition, 402. adjustable angle partition, 403. angle adjustment actuator rod, 404. ruler, 5. angle adjustment connecting rod mechanism, 501. electric actuator, 502. transmission rod, 503. wear-resistant parts, 504. connecting rod, 505 ruler. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, a rectifying grid structure with adjustable angle in different zones is provided, wherein a guide plate 1 is arranged on the air inlet side of the rectifying grid structure, and a first layer catalyst 2 is arranged on the air outlet side. The rectifying grid structure is composed of a plurality of rectifying grid bodies 4 which are symmetrically arranged and connected by support rods 3. Each rectifying grid body 4 is provided with an angle adjustment connecting rod mechanism 5 for adjusting the internal ventilation angle of the rectifying grid body 4 on the side away from the support rod 3. The internal ventilation angle of each rectifying grid body 4 can be adjusted respectively through the angle adjustment connecting rod mechanism 5, so as to realize the zoned adjustment of the amount of flue gas passing through different areas in the same cross section.

[0023] To further optimize this solution, Figure 2 As shown, the rectifier grid body 4 is a grid-like structure composed of a plurality of fixed partitions 401 and a plurality of adjustable angle partitions 402. The plurality of fixed partitions 401 are fixedly connected to the support rods 3, and the plurality of adjustable angle partitions 402 are mounted on the top of the plurality of fixed partitions 401 and can swing left or right relative to the adjustable angle partitions 402.

[0024] To further optimize the present solution, the inner side of the top of the adjustable angle partition 402 is detachably connected with an angle adjustment actuator rod 403 along the length direction, and the ends of the plurality of angle adjustment actuator rods 403 are commonly provided with the angle adjustment connecting rod mechanism 5.

[0025] To further optimize this solution, Figure 3 As shown, the angle adjustment link mechanism 5 includes an electric actuator 501, a transmission rod 502, and a plurality of wear-resistant parts 503 of the same number as the angle adjustment link mechanism 5, each of the angle adjustment actuator rods 403 is sleeved with one of the wear-resistant parts 503, and each of the angle adjustment actuator rods 403 is sleeved with a connecting rod 504 on the outer side of the wear-resistant part 503, and the free ends of the plurality of connecting rods 504 are hinged to the transmission rod 502, and the end of one of the angle adjustment actuator rods 403 is connected to the electric actuator 501, and when connected with the electric actuator 501, the angle adjustment actuator rod 403 is connected to the transmission rod 502. When the angle adjustment actuator rod 403 connected to the electric actuator 501 rotates, the connecting rod 504 drives the transmission rod 502 to move. At the same time, the transmission rod 502 further drives multiple angle adjustment actuator rods 403 to rotate synchronously, thereby realizing the synchronous rotation of multiple adjustable angle partitions 402, completing the adjustment of the internal ventilation angle of a single rectifying grid body 4, and then adjusting the internal ventilation angle of each rectifying grid body 4 separately according to the different positions, thereby realizing the zoning adjustment of the amount of smoke passing through different areas in the same cross-section.

[0026] Among them, the electric actuator 501, the transmission rod 502 and multiple connecting rods 504 are all arranged on the outside of the flue, while the multiple wear-resistant parts 503 are located on the inside of the flue. The wear-resistant parts 503, the flue shell and the connecting rods 504 are used together to achieve the supporting effect on the angle adjustment actuator rod 403.

[0027] To further optimize the present solution, the wear-resistant part 503 is shaped like a magnetic needle which is wide in the middle and narrow at both ends, and the angle adjustment actuator rod 403 passes through the end surface of the wear-resistant part 503 along the center position. The design of the wear-resistant part 503 can reduce the resistance with the inner wall of the flue while meeting the requirements of installing the angle adjustment actuator rod 403 and providing stable support.

[0028] To further optimize the present solution, at least one of the angle adjustment actuator rods 403 is provided with a scale 505 for displaying the rotation angle of the angle adjustment actuator rod 403, and the scale 505 is also provided on the outside of the flue for the operator to view at any time. To further optimize the present solution, in order to achieve the purpose of reducing costs, the scale 505 can be in the form of a dial and a pointer, the pointer is fixed to the angle adjustment actuator rod 403 and rotates synchronously with the angle adjustment actuator rod 403, the dial is fixed on the outer wall of the flue, and before use, the original zero point of the dial and the pointer needs to be calibrated. Of course, in order to achieve the best use effect, a scale 505 can also be provided on each angle adjustment actuator rod 403 to achieve the purpose of intuitive and real-time detection of the working status of the adjustable angle partition 402 on each angle adjustment actuator rod 403.

[0029] To further optimize the present solution, the electric actuator 501 includes but is not limited to a transmission mechanism consisting of a motor and a commutator, and both the motor and the commutator are fixedly disposed on the outer wall of the flue.

[0030] To further optimize this solution, Figure 4 and Figure 5 As shown, the top of the fixed partition 401 and the bottom of the adjustable angle partition 402 are both provided with a plurality of through slots 404 that match each other and are used to enable the adjustable angle partition 402 to swing left and right, and the thickness of the adjustable angle partition 402 is smaller than the length of the through slots 404 opened on the fixed partition 401.

[0031] To further optimize the present solution, the height of the through slot 404 provided on the adjustable angle partition 402 is greater than the height of the through slot 404 provided on the fixed partition 401 .

[0032] To further optimize the present solution, the support rod 3 is a rotatable structure with bearings provided at both ends. By rotating the support rod 3, the working surface of the rectifier grid structure can be rotated to different cross-sections to achieve zoning regulation of the amount of flue gas passing through different areas within different cross-sections.

[0033] The number of groups of rectifying grid bodies 4 in each flue can be designed according to the size of the flue. In the present embodiment, every five fixed partitions 401 and every five adjustable angle partitions 402 are used as a group and are cross-arranged to form a rectifying grid body 4. The size of each compartment in the rectifying grid body 4 is 20cm×20cm, and the angle adjustment range of each adjustable angle partition 402 is -30° to +30°. The two rectifying grid bodies 4 are symmetrically arranged on both sides of the support rod 3. Both sides of the support rod 3 are provided with bearings installed on the outer wall of the flue. The adjustment of different cross-sections in the flue is achieved by rotating the support rod 3, and then the internal ventilation angle of each rectifying grid body 4 is adjusted separately by the angle adjustment connecting rod mechanism 5, so as to realize the zoned adjustment of the amount of smoke passing through different areas in the same cross-section.

[0034] The invention has a novel and unique structure, is simple and reasonable, can adjust the flow field at any time through the angle adjustment connecting rod mechanism 5, is flexible and convenient to use, has good effect, and has good social and economic benefits.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rectifying grid structure with adjustable angles in different zones, wherein a guide plate (1) is arranged on the air inlet side of the rectifying grid structure, and a first layer of catalyst (2) is arranged on the air outlet side, characterized in that: The rectifying grid structure is composed of a plurality of rectifying grid bodies (4) which are symmetrically arranged and connected via support rods (3); each rectifying grid body (4) is provided with an angle adjustment connecting rod mechanism (5) for adjusting the internal ventilation angle of the rectifying grid body (4) on a side away from the support rod (3); the internal ventilation angle of each rectifying grid body (4) can be adjusted respectively via the angle adjustment connecting rod mechanism (5), thereby realizing zoned adjustment of the amount of smoke passing through different areas within the same cross section; The rectifying grid body (4) is a grid-like structure composed of a plurality of fixed baffles (401) and a plurality of adjustable angle baffles (402), the plurality of fixed baffles (401) are all fixedly connected to the support rods (3), and the plurality of adjustable angle baffles (402) are mounted on top of the plurality of fixed baffles (401); An angle adjustment actuating rod (403) is detachably connected to the inner side of the top of the adjustable angle partition (402) along the length direction, and the ends of the plurality of angle adjustment actuating rods (403) are commonly provided with the angle adjustment connecting rod mechanism (5); The top of the fixed partition (401) and the bottom of the adjustable angle partition (402) are both provided with a plurality of through slots that match each other and are used to enable the adjustable angle partition (402) to swing left or right, and the thickness of the adjustable angle partition (402) is smaller than the length of the through slots provided on the fixed partition (401); The support rod (3) is a rotatable structure, with bearings provided at both ends.

2. The rectifier grid structure with adjustable angle in different zones according to claim 1, characterized in that: The angle adjustment connecting rod mechanism (5) comprises an electric actuator (501), a transmission rod (502), and a plurality of wear-resistant parts (503) of the same number as the angle adjustment connecting rod mechanism (5); each angle adjustment actuator rod (403) is sleeved with one of the wear-resistant parts (503); and each angle adjustment actuator rod (403) is sleeved with a connecting rod (504) on the outer side of the wear-resistant part (503); the free ends of the plurality of connecting rods (504) are hinged to the transmission rod (502); and the end of one of the angle adjustment actuator rods (403) is connected to the electric actuator mechanism (501).

3. The rectifier grid structure with adjustable angle in different zones according to claim 2, characterized in that: The wear-resistant part (503) is in the shape of a magnetic needle that is wide in the middle and narrow at both ends, and the angle adjustment actuator rod (403) passes through the end surface of the wear-resistant part (503) along the center position.

4. The rectifier grid structure with adjustable angle in different zones according to claim 2, characterized in that: At least one of the angle adjustment actuating rods (403) is provided with a scale (505) for displaying the rotation angle of the angle adjustment actuating rod (403).

5. The rectifier grid structure with adjustable angle in different zones according to claim 2, characterized in that: The electric actuator (501) includes but is not limited to a transmission mechanism consisting of a motor and a commutator.

6. The rectifier grid structure with adjustable angle in different zones according to claim 1, characterized in that: The height of the through slot (404) provided on the adjustable angle partition (402) is greater than the height of the through slot (404) provided on the fixed partition (401).

Images