A device for capturing large particles of dust in the flue gas before the SCR

Abstract

The application discloses an SCR front flue large-particle dust capturing device and relates to the technical field of flue gas treatment. The device comprises a main flue and two bypass dust capturing mechanisms. Two mounting holes are symmetrically arranged on the left and right sides of the main flue. Each shell is arranged on a mounting hole. A support frame is arranged inside the shell and is used for supporting the shell. A dust collecting hopper is connected to the lower part of the shell. The front and rear ends of a flue bending partition plate are arranged on the front and rear inner walls of the main flue. A horizontal dust intercepting assembly is arranged on the support frame and is arranged on the flue bending partition plate at one end close to the center of the main flue. A vertical dust intercepting assembly is arranged on the support frame and is arranged below the horizontal dust intercepting assembly at one side close to the center of the main flue. The device can capture large-particle dust in the high-temperature section before the SCR. The device reduces the large-particle dust entering the rear-end environmental protection system as a whole and systematically solves the series of problems caused by the large-particle dust in the flue gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas treatment, in particular to a large particle dust trapping device in front of a flue of SCR. BACKGROUND

[0002] The existing SCR denitration system, because the original flue gas directly enters the SCR reactor without being dedusted, the large particle dust in the flue gas is easy to cause the wear and blockage of the SCR catalyst, and further increase the dust removal pressure of the dust remover and the difficulty of auxiliary dust removal of the desulfurization tower. It can be said that the large particle dust in the flue gas causes the systematic influence of the environmental protection equipment of the coal-fired power plant, and even affects the control of the ultra-low emission index. For the large particle dust in the flue gas, the traditional solution is the efficiency improvement of the SCR, dust remover and desulfurization system, which can only solve the local problem and cannot solve the systematic problem. SUMMARY

[0003] To solve the above technical problems, the present application provides a large particle dust trapping device in front of a flue of SCR, which can trap large particle dust in the high temperature section in front of the SCR, and reduce the large particle dust entering the rear end environmental protection system as a whole, and systematically solve the series problems caused by the large particle dust in the flue gas.

[0004] To achieve the above purpose, the present application provides the following scheme:

[0005] The present application provides a large particle dust trapping device in front of a flue of SCR, which comprises a main flue and two bypass dust trapping mechanisms, the bypass dust trapping mechanism comprises a shell, a support frame, a dust collecting hopper, a horizontal dust interception assembly, a vertical dust interception assembly and a flue bending partition plate, two installation holes are symmetrically arranged on the left and right sides of the main flue, each shell is arranged on the installation hole, the support frame is arranged inside the shell and is used for supporting the shell, the dust collecting hopper is connected to the lower part of the shell, the front and rear ends of the flue bending partition plate are arranged on the front and rear inner walls of the main flue respectively, the upper ends of the two flue bending partition plates are connected, the lower ends of the two flue bending partition plates are connected, the horizontal dust interception assembly is installed on the support frame and is installed on the flue bending partition plate close to one end of the center of the main flue, and the vertical dust interception assembly is installed on the support frame and is located below the horizontal dust interception assembly and close to one side of the center of the main flue.

[0006] Preferably, the flue bending partition plate comprises an upper partition plate and a lower partition plate, the front and rear ends of the upper partition plate are arranged on the front and rear inner walls of the main flue respectively, the upper partition plate is arranged downwardly from one end close to the center of the main flue to one end far from the center of the main flue, the front and rear ends of the lower partition plate are arranged on the front and rear inner walls of the main flue respectively, the lower partition plate is arranged upwardly from one end close to the center of the main flue to one end far from the center of the main flue, one end far from the center of the main flue of the upper partition plate and one end far from the center of the main flue of the lower partition plate are connected, one end close to the center of the main flue of the two upper partition plates is connected, and one end close to the center of the main flue of the two lower partition plates is connected.

[0007] Preferably, the bypass dust collection mechanism further comprises a flow guide plate, the front and rear ends of the flow guide plate are arranged on the front and rear inner walls of the main flue respectively, and the flow guide plate is located below the lower partition plate.

[0008] Preferably, the lower partition plate and the flow guide plate are arc-shaped plates, and the convex directions of the lower partition plate and the flow guide plate both point to the center of the main flue.

[0009] Preferably, the flue bending partition plate further comprises a vertical connecting plate, one end far from the center of the main flue of the upper partition plate and one end far from the center of the main flue of the lower partition plate are connected through the vertical connecting plate, the front and rear ends of the vertical connecting plate are arranged on the front and rear inner walls of the main flue respectively, and one end close to the center of the main flue of the horizontal dust interception assembly is mounted on the vertical connecting plate.

[0010] Preferably, the horizontal dust interception assembly comprises two horizontal support plates and a plurality of first angle steels arranged in the horizontal direction in sequence, the front and rear ends of each first angle steel are fixed on the two horizontal support plates respectively, the bending part of the first angle steel points upward, and the two ends of each horizontal support plate are fixed on the support frame and the flue bending partition plate respectively.

[0011] Preferably, the setting density of the first angle steel decreases from one end close to the center of the main flue to one end far from the center of the main flue.

[0012] Preferably, the vertical dust interception assembly comprises two vertical support plates and a plurality of second angle steels arranged in the vertical direction in sequence, the front and rear ends of each second angle steel are fixed on the two vertical support plates respectively, the bending part of the second angle steel points upward, and the upper and lower ends of each vertical support plate are fixed on the support frame.

[0013] Preferably, the vertical dust interception assembly is provided in a plurality of parallel arrangements.

[0014] Preferably, the bypass dust collecting mechanism further comprises a plurality of legs, and the upper end of each of the legs is connected to the bottom of the shell.

[0015] The present application has the following technical effects relative to the prior art:

[0016] In the SCR pre-flue large particle dust collecting device, two mounting holes are symmetrically arranged on the left and right sides of the main flue, each shell is arranged on one mounting hole, the dust collecting hopper is connected to the lower part of the shell, the horizontal dust interception assembly is installed on the support frame and is installed on the flue bending partition plate at one end close to the center of the main flue, and the vertical dust interception assembly is installed on the support frame and is located below the horizontal dust interception assembly and close to one side of the center of the main flue. When working, the flue gas passes through the vertical dust interception assembly and the horizontal dust interception assembly in sequence from below the flue bending partition plate, and then enters the main flue from above the flue bending partition plate. Under the action of the vertical dust interception assembly and the horizontal dust interception assembly, the large particle dust is intercepted and settled in the dust collecting hopper. It can be seen that the device can collect large particle dust in the high-temperature section before the SCR, which reduces the large particle dust entering the rear-end environmental protection system as a whole, and systematically solves the series of problems caused by large particle dust in flue gas. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0018] Figure 1 The structure schematic diagram of the SCR pre-flue large particle dust collecting device provided by the present application is shown in the figure.

[0019] Figure 2 The structure schematic diagram of the SCR pre-flue large particle dust collecting device provided by the present application is shown in the figure. Figure 1 The local enlarged view of A in the figure.

[0020] The structure schematic diagram of the SCR pre-flue large particle dust collecting device provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0022] The purpose of the present application is to provide a large-particle dust trapping device for a flue before an SCR, which can trap large-particle dust in a high-temperature section before the SCR, and reduce the large-particle dust entering the rear-end environmental protection system as a whole, and systematically solve the series of problems caused by the large-particle dust in the flue gas.

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0024] As shown in Figure 1 and Figure 2 The present embodiment provides a large-particle dust trapping device for a flue before an SCR 100, which includes a main flue 1 and two bypass dust trapping mechanisms. The bypass dust trapping mechanism includes a shell 2, a support frame 3, a dust collecting hopper 4, a horizontal dust interception assembly 5, a vertical dust interception assembly 6 and a flue bending partition. The main flue 1 in the present embodiment is a rectangular flue. Two installation holes are symmetrically arranged on the left and right sides of the main flue 1. The two bypass dust trapping mechanisms in the present embodiment are symmetrically arranged. Each shell 2 is arranged on one installation hole. The shell 2 is connected with the main flue 1. The support frame 3 is arranged inside the shell 2 and is used for supporting the shell 2. The shell 2 is connected with the support frame 3. The dust collecting hopper 4 is connected to the lower part of the shell 2. The shell 2 is connected with the dust collecting hopper 4. The front and rear ends of the flue bending partition are arranged on the front and rear inner walls of the main flue 1 respectively. The upper ends of the two flue bending partitions are connected. The lower ends of the two flue bending partitions are connected. Specifically, the bending part of the flue bending partition faces away from the center of the main flue 1. The upper ends of the two flue bending partitions meet at the center of the main flue 1 for connection. The lower ends of the two flue bending partitions meet at the center of the main flue 1 for connection. The horizontal dust interception assembly 5 is installed on the support frame 3 and is installed on the flue bending partition near one end of the center of the main flue 1. The vertical dust interception assembly 6 is installed on the support frame 3 and is located below the horizontal dust interception assembly 5 near one side of the center of the main flue 1.

[0025] In operation, flue gas passes through the vertical dust interception assembly 6 and the horizontal dust interception assembly 5 in turn from below the flue gas bending partition plate, and then enters the main flue 1 from above the flue gas bending partition plate. Under the action of the vertical dust interception assembly 6 and the horizontal dust interception assembly 5, large-particle dust is intercepted and settles into the dust collecting hopper 4. The dust collected in the dust collecting hopper 4 can be transported to a designated location through a warehouse pump and a dust conveying pipeline and other dust conveying equipment.

[0026] The device can produce the following benefits through partial capture of large-particle dust in flue gas: first, the plugging and wear of the SCR catalyst and the air preheater caused by large-particle dust are reduced, and the operation stability of the SCR and the air preheater is improved; second, the dust content at the inlet of the dust collector is reduced, the dust removal efficiency of the dust collector is improved, the stable and efficient operation of the dust collector is ensured, and the pressure of the dust conveying system of the dust collector is reduced; third, the reduction of dust at the outlet of the dust collector can reduce the dust removal pressure of the desulfurization tower, improve the usability of the desulfurization slurry, and improve the quality of the desulfurization gypsum; fourth, the collected high-temperature ash does not contain SO3 and hydrosulfuric acid, which affect the quality of ash, and the high-temperature ash can be recycled.

[0027] It can be seen that the device can capture large-particle dust in the high-temperature section before the SCR, which reduces the large-particle dust entering the rear-end environmental protection system as a whole and systematically solves the series of problems caused by large-particle dust in flue gas. At the same time, the device has a simple structure, uses a physical method for natural settlement, has stable and reliable operation, and does not consume electric energy; the pressure difference is increased by about 200 Pa, which has little effect on the induced draft fan; the investment is small, the benefits are huge, the cost performance is high, and the application scenarios are numerous.

[0028] Specifically, the flue gas bending partition plate includes an upper partition plate 7 and a lower partition plate 8. The front and rear ends of the upper partition plate 7 are arranged on the front and rear inner walls of the main flue 1, respectively. The upper partition plate 7 is arranged downwardly from one end close to the center of the main flue 1 to one end away from the center of the main flue 1, and an upper portion passage is formed between the upper partition plate 7 and the upper portion of the shell 2. The front and rear ends of the lower partition plate 8 are arranged on the front and rear inner walls of the main flue 1, respectively. The lower partition plate 8 is arranged upwardly from one end close to the center of the main flue 1 to one end away from the center of the main flue 1, and a lower portion passage is formed between the lower partition plate 8 and the lower portion of the shell 2. The one end away from the center of the main flue 1 of the upper partition plate 7 and the one end away from the center of the main flue 1 of the lower partition plate 8 are connected. The one end close to the center of the main flue 1 of the horizontal dust interception assembly 5 is installed at the connection of the upper partition plate 7 and the lower partition plate 8. The one end close to the center of the main flue 1 of the two upper partition plates 7 is connected. The one end close to the center of the main flue 1 of the two lower partition plates 8 is connected.

[0029] Specifically, the bypass dust collection mechanism further comprises a guide plate 10, both ends of the guide plate 10 are arranged on the front and rear inner walls of the main flue 1, and the guide plate 10 is located below the lower partition plate 8. By arranging the guide plate 10, the flue gas passes through the guide plate 10 from below the lower partition plate 8, enters the vertical dust interception assembly 6, then passes through the horizontal dust interception assembly 5, and enters the main flue 1 from above the upper partition plate 7.

[0030] In the embodiment, the lower partition plate 8 and the guide plate 10 are both arc-shaped plates, and the convex directions of the lower partition plate 8 and the guide plate 10 both point to the center of the main flue 1.

[0031] Specifically, the flue bending partition plate further comprises a vertical connecting plate 9, one end of the upper partition plate 7 and the lower partition plate 8 away from the center of the main flue 1 is connected through the vertical connecting plate 9, both ends of the vertical connecting plate 9 are arranged on the front and rear inner walls of the main flue 1, and one end of the horizontal dust interception assembly 5 close to the center of the main flue 1 is installed on the vertical connecting plate 9.

[0032] Specifically, the horizontal dust interception assembly 5 comprises two horizontal support plates 51 and a plurality of first angle steels 52 arranged in sequence in the horizontal direction, both ends of each first angle steel 52 are fixed on the two horizontal support plates 51 respectively, the plurality of first angle steels 52 are all arranged obliquely and have the same oblique angle, the bending part of the first angle steel 52 points to the upper side, and the setting density of the first angle steel 52 can be adjusted to adjust the collection efficiency of large particle dust, both ends of each horizontal support plate 51 are fixed on the support frame 3 and the flue bending partition plate respectively, and specifically, one end of each horizontal support plate 51 close to the center of the main flue 1 is fixed on the vertical connecting plate 9. The horizontal support plate 51 in the embodiment is a horizontally arranged I-beam.

[0033] Since the vertical dust interception assembly 6 is arranged below the horizontal dust interception assembly 5 close to the center of the main flue 1, the dust close to the center of the main flue 1 below the horizontal dust interception assembly 5 is more, and in order to adapt to the distribution of the dust, the setting density of the first angle steel 52 in the embodiment decreases from one end close to the center of the main flue 1 to one end away from the center of the main flue 1.

[0034] Specifically, the vertical dust interception assembly 6 comprises two vertical support plates 61 and a plurality of second angle steels 62 arranged in sequence in the vertical direction, both ends of each second angle steel 62 are fixed on the two vertical support plates 61 respectively, the plurality of second angle steels 62 are all arranged obliquely and have the same oblique direction, the bending part of the second angle steel 62 points to the upper side, and the setting density of the second angle steel 62 can be adjusted to adjust the collection efficiency of large particle dust, and both ends of each vertical support plate 61 are fixed on the support frame 3. The vertical support plate 61 in the embodiment is a vertically arranged I-beam.

[0035] In the embodiment, the vertical dust interception assemblies 6 are arranged in multiple and parallel to each other, thereby improving the dust removal effect.

[0036] Specifically, the bypass dust collection mechanism further comprises a plurality of legs 11, the upper end of each leg 11 is connected with the bottom of the shell 2, thereby supporting the bottom of the shell 2, so that the shell 2 is more stable.

[0037] In the embodiment, the shell 2 is made of a thermal insulation composite board, which comprises an inner steel plate, a thermal insulation layer and an outer steel plate arranged from inside to outside, and the thermal insulation layer is made of asbestos.

[0038] The principles and implementation manners of the present application are described in the specification by using specific examples, and the above description of the examples is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A device for capturing large particle dust from the flue gas upstream of an SCR, characterized in that The bypass dust trapping mechanism comprises a shell, a supporting frame, a dust collecting hopper, a horizontal dust intercepting assembly, a vertical dust intercepting assembly and a flue bending partition plate, two mounting holes are symmetrically arranged on the left and right sides of the main flue, each shell is arranged on one mounting hole, the supporting frame is arranged inside the shell and is used for supporting the shell, the dust collecting hopper is connected to the lower part of the shell, the front and rear ends of the flue bending partition plate are arranged on the front and rear inner walls of the main flue respectively, the upper ends of the two flue bending partition plates are connected, the lower ends of the two flue bending partition plates are connected, the horizontal dust intercepting assembly is installed on the supporting frame and is installed on the flue bending partition plate close to one end of the center of the main flue, and the vertical dust intercepting assembly is installed on the supporting frame and is located below the horizontal dust intercepting assembly and close to one side of the center of the main flue.

2. The SCR pre-flue large particle dust capturing device according to claim 1, characterized in that, The flue bending partition plate comprises an upper partition plate and a lower partition plate, the front and rear ends of the upper partition plate are arranged on the front and rear inner walls of the main flue respectively, the upper partition plate is arranged to be inclined downward from one end close to the center of the main flue to one end away from the center of the main flue, the front and rear ends of the lower partition plate are arranged on the front and rear inner walls of the main flue respectively, the lower partition plate is arranged to be inclined upward from one end close to the center of the main flue to one end away from the center of the main flue, one end of the upper partition plate and one end of the lower partition plate away from the center of the main flue are connected, one end of the two upper partition plates close to the center of the main flue is connected, and one end of the two lower partition plates close to the center of the main flue is connected.

3. The SCR pre-flue large particle dust capturing device according to claim 2, characterized in that, The bypass dust trapping mechanism further comprises a guide plate, the front and rear ends of the guide plate are arranged on the front and rear inner walls of the main flue respectively, and the guide plate is located below the lower partition plate.

4. The SCR pre-flue large particle dust capturing device according to claim 3, characterized in that, The lower partition plate and the guide plate are both arc-shaped plates, and the convex directions of the lower partition plate and the guide plate both point to the center of the main flue.

5. The SCR pre-flue large particle dust collection device according to claim 2, characterized by, The flue bending partition plate further comprises a vertical connecting plate, one end of the upper partition plate and one end of the lower partition plate away from the center of the main flue are connected through the vertical connecting plate, the front and rear ends of the vertical connecting plate are arranged on the front and rear inner walls of the main flue respectively, and one end of the horizontal dust intercepting assembly close to the center of the main flue is installed on the vertical connecting plate.

6. The SCR pre-flue large particle dust collection device according to claim 1, characterized by, The horizontal dust intercepting assembly comprises two horizontal supporting plates and a plurality of first angle steels arranged in the horizontal direction in sequence, the front and rear ends of each first angle steel are fixed on the two horizontal supporting plates respectively, the bending part of the first angle steel points to the upper, and the two ends of each horizontal supporting plate are fixed on the supporting frame and the flue bending partition plate respectively.

7. The SCR pre-flue large particle dust capturing device according to claim 6, characterized in that, The setting density of the first angle steel decreases in sequence from one end close to the center of the main flue to one end away from the center of the main flue.

8. The SCR pre-flue large particle dust collection device according to claim 1, characterized by, The vertical dust interception assembly comprises two vertical support plates and a plurality of second angle steels arranged in sequence in the vertical direction, the front and rear ends of each second angle steel are fixed on the two vertical support plates respectively, the bending part of the second angle steel points upwards, and the upper and lower ends of each vertical support plate are fixed on the support frame.

9. The SCR pre-flue large particle dust collection device according to claim 1, characterized by, The vertical dust interception assemblies are arranged in parallel.

10. The SCR pre-flue large particle dust collection device according to claim 1, characterized by, The bypass dust capturing mechanism further comprises a plurality of supporting legs, and the upper end of each supporting leg is connected with the bottom of the shell.

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