Flue gas desulfurization, denitrification and dust removal device

Abstract

A flue gas desulfurization, denitrification and dust removal device comprises a desulfurization and denitrification tower body, a flue gas inlet is formed in the bottom of the desulfurization and denitrification tower body, a flue gas outlet is formed in the upper portion of the desulfurization and denitrification tower body, a filtering mechanism and a spraying mechanism capable of spraying a desulfurization and denitrification agent downwards are sequentially arranged in the desulfurization and denitrification tower body from bottom to top, and a cleaning mechanism is arranged on the filtering mechanism; the filter mechanism comprises a filter screen rotationally arranged in the desulfurization and denitrification tower body; the cleaning mechanism comprises a liquid spraying pipe and a plurality of cleaning nozzles, the liquid spraying pipe is connected with the inner wall of the desulfurization and denitrification tower body through a connecting piece, the liquid spraying pipe is communicated with an external stock solution box, a cleaning brush is arranged on the outer side of each cleaning nozzle, the end, away from the cleaning nozzle, of each cleaning brush extends to the surface of the filter screen, and the cleaning nozzles face the filter screen. According to the utility model, the filter screen is rotated, the cleaning nozzle is used for spraying liquid onto the filter screen, and the upper surface and meshes of the filter screen can be easily and quickly cleaned in cooperation with the bristles of the cleaning brush, so that dust or a mixture on the filter screen is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a flue gas desulfurization, denitrification and dust removal device. Background Art

[0002] The flue gas generated by fuel combustion contains harmful gases and needs to be treated through desulfurization and denitrification processes to reduce sulfides and nitrogen oxides in the flue gas. Generally, the flue gas is introduced into a desulfurization and denitrification tower, and desulfurization and denitrification agents are sprayed in the desulfurization and denitrification tower to react with the flue gas. The desulfurization and denitrification tower is also equipped with a filter below the nozzle of the desulfurization and denitrification agent spray to filter large particles of impurities in the flue gas and improve the reaction efficiency of the flue gas with the desulfurization and denitrification agents.

[0003] In the prior art, the filter screens in small and medium-sized desulfurization and denitrification towers will become clogged after long-term use, which will affect the flue gas from passing through the filter screen and reacting with the sprayed desulfurization and denitrification agents. For this reason, there is a prior art means to set a cleaning scraper on the filter screen to clean the filter screen. Since the desulfurization and denitrification agents sprayed by the nozzle are atomized water droplets, they cannot clean the filter screen, so the cleaning scraper can only remove part of the dust on the filter screen or the mixture of the desulfurization and denitrification agents and the flue gas reactions. The cleaning effect is limited, and the dust or mixture easily adheres to the cleaning scraper and the filter screen, making cleaning inconvenient. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a flue gas desulfurization, denitrification and dust removal device.

[0005] The technical solution of this utility model is as follows:

[0006] A flue gas desulfurization, denitration and dust removal device comprises a desulfurization and denitration tower body, wherein the bottom of the desulfurization and denitration tower body is provided with a flue gas inlet, the top of the desulfurization and denitration tower body is provided with a flue gas outlet, a filtering mechanism and a spraying mechanism capable of spraying a desulfurization and denitration agent downward are sequentially arranged in the desulfurization and denitration tower body from bottom to top, and a cleaning mechanism is arranged on the filtering mechanism;

[0007] The filtering mechanism includes a filter screen rotatably arranged in the desulfurization and denitration tower body and a rotating shaft capable of rotating, the axis of the filter screen is parallel to or coincides with the axis of the desulfurization and denitration tower body, the axis of the rotating shaft is consistent with the axis of the filter screen, and one end of the rotating shaft is connected to the middle of the filter screen, and the other end passes through the desulfurization and denitration tower body downward to be connected to an external driving motor;

[0008] The cleaning mechanism includes a liquid spray pipe and multiple cleaning nozzles connected to the liquid spray pipe. The liquid spray pipe is connected to the inner wall of the desulfurization and denitrification tower body through a connecting piece, and its length direction is arranged in coordination with the upper surface of the filter. The liquid spray pipe is connected to the external raw liquid tank, and the cleaning nozzle is set toward the filter. A cleaning brush is provided on the outside of each cleaning nozzle, and the cleaning brush extends from one end away from the cleaning nozzle to the surface of the filter.

[0009] When it is necessary to clean the dust and impurities attached to the filter, rotate the filter and use the cleaning nozzle to spray liquid on the filter at the same time. The cleaning nozzle has a strong flushing effect, and the bristles of the cleaning brush can easily clean the upper surface and mesh of the filter quickly, reducing the dust or mixture on the filter, making it easier for the flue gas to pass through the filter smoothly and fully mix with the desulfurization and denitrification agents.

[0010] In order to increase the filtering area of ​​dust in the smoke, the filter is set to be a conical filter. Compared with a filter with a straight structure, it can increase the contact area with the smoke and the amount of smoke passing through.

[0011] Regarding the specific structure of the liquid spray pipe, at least one liquid spray pipe is provided and arranged along the generatrix direction of the filter screen, so that when the filter screen rotates, the cleaning nozzle and the cleaning brush on the liquid spray pipe can clean the entire filter screen.

[0012] The specific structure of the above-mentioned spray mechanism is that the spray mechanism includes a desulfurization and denitrification nozzle and a spray pipe connected thereto, the spray pipe is connected to a raw liquid tank, and the raw liquid tank is filled with a desulfurization and denitrification agent solution.

[0013] In order to reduce the occupied area of ​​the cleaning mechanism, the filter screen is flushed and cleaned with the liquid in the raw liquid tank. For this purpose, a liquid spray pipe is arranged to be connected with the spray pipe through a connecting pipe with a switch.

[0014] The specific structure of the above-mentioned filter screen installed inside the desulfurization and denitrification tower body is that an annular support seat is provided inside the desulfurization and denitrification tower body, and the lower end of the filter screen is arranged on the annular support seat and slidably connected thereto.

[0015] Regarding the distance between the cleaning nozzle and the filter, the distance between the cleaning nozzle and the upper surface of the filter is set to 1-5 cm, so that the cleaning nozzle can effectively flush and clean the filter.

[0016] The beneficial effects of the utility model are:

[0017] The flue gas from fuel combustion enters the desulfurization and denitrification tower through the flue gas inlet. The filter can initially filter the dust in the flue gas. The flue gas reacts with the desulfurization and denitrification solution sprayed downward. The flue gas after desulfurization and denitrification is defogged by the demister in the desulfurization and denitrification tower body and can enter the next process through the flue gas outlet, such as defog and discharge after heating.

[0018] The cleaning nozzle and the cleaning brush are fixedly arranged above the filter. The cleaning brush directly contacts the upper surface of the filter or its mesh. By rotating the filter, the cleaning nozzle sprays liquid to the filter, and cooperates with the cleaning brush to clean the upper surface and mesh of the filter, thereby reducing the phenomenon that the filter cannot be fully flushed during the cleaning process, resulting in unclean cleaning and affecting the flue gas desulfurization and denitrification reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the attached picture:

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure;

[0021] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0022] Figure 3 for Figure 1 The enlarged structural diagram at B in the middle;

[0023] Figure 4 It is a schematic diagram of the internal structure;

[0024] The components represented by the reference numerals in the figure are:

[0025] 1. Desulfurization and denitrification tower body; 101. Flue gas inlet; 102. Flue gas outlet; 103. Drain pipe; 2. Filter; 3. Liquid spray pipe; 4. Cleaning nozzle; 5. Cleaning brush; 6. Annular support seat; 7. Desulfurization and denitrification nozzle; 8. Spray pipe; 9. Connecting pipe; 10. Rotating shaft; 11. Driving motor; 12. Defogger; 13. Connecting parts. DETAILED DESCRIPTION

[0026] See also Figure 1 A flue gas desulfurization, denitrification and dust removal device is shown, comprising a desulfurization and denitrification tower body 1, wherein a flue gas inlet 101 and a sewage pipe 103 for discharging sewage are provided at the bottom of the desulfurization and denitrification tower body 1, and a flue gas outlet 102 is provided at the top. A filtering mechanism, a spraying mechanism capable of spraying desulfurization and denitrification agents downward, and a demister 12 are provided in the desulfurization and denitrification tower body 1 from bottom to top. The demister is located below the flue gas outlet 102 and is a prior art, wherein a cleaning mechanism is provided on the filtering mechanism.

[0027] The filter mechanism is located above the flue gas inlet 101. The utility model can be applied to small and medium-sized desulfurization and denitrification towers to remove flue gas from the denitrification and dust treatment. Therefore, the filter mechanism includes a filter screen 2 rotatably arranged in the desulfurization and denitrification tower body 1 and a rotating shaft 10 that can rotate. The axis of the filter screen 2 is parallel to or coincides with the axis of the desulfurization and denitrification tower body 1. The axis of the rotating shaft 10 is consistent with the axis of the filter screen 2. One end of the rotating shaft 10 is connected to the middle of the filter screen 2 and is fixed by a reinforcing rib. The other end passes through the desulfurization and denitrification tower body 1 downward and is connected to an external drive motor 11. The drive motor 11 can drive the filter screen 2 to rotate. In order to increase the filtering area of ​​the filter screen 2 for filtering dust in the flue gas, the filter screen 2 is set as a conical filter screen 2 in this embodiment. Compared with the filter screen 2 with a straight structure, the contact area with the flue gas and the amount of flue gas passing through can be increased.

[0028] See also Figure 1 and Figure 3 As shown, the specific structure of the filter screen 2 installed inside the desulfurization and denitrification tower body 1 is that an annular support seat 6 is provided inside the desulfurization and denitrification tower body 1, and the filter screen 2 is installed in the desulfurization and denitrification tower body 1. Due to the difficulty of installation, the axis of the filter screen 2 may not completely coincide with the axis of the desulfurization and denitrification tower body 1. In order to facilitate the installation and rotation of the filter screen 2, an annular groove is provided on the upper surface of the annular support seat 6, and the lower end face of the filter screen 2 is arranged in the annular groove, and the filter screen 2 can rotate in the annular groove. In order to avoid water accumulation in the annular groove, a vertical downward through hole is opened in the annular groove for draining the solution in the annular groove.

[0029] The specific structure of the spray mechanism is that the spray mechanism includes a plurality of desulfurization and denitrification nozzles 7 and a spray pipe 8 connected thereto. The spray pipe 8 is connected to a raw liquid tank, and the raw liquid tank is filled with a configured desulfurization and denitrification agent solution.

[0030] See also Figure 1 , Figure 2 and Figure 4 As shown, the cleaning mechanism includes a liquid spray pipe 3 and a plurality of cleaning nozzles 4 connected thereto, the plurality of cleaning nozzles 4 are arranged along the length direction of the liquid spray pipe 3, the liquid spray pipe 3 is connected to the inner wall of the desulfurization and denitrification tower body 1 through a connecting piece 13, and its length direction is arranged in coordination with the busbar of the filter screen 2, the liquid spray pipe 3 is connected to the external raw liquid tank, a cleaning brush 5 is provided on the outside of each cleaning nozzle 4, the bristles of the cleaning brush 5 are arranged around the cleaning nozzle 4, the cleaning brush 5 extends away from one end of the cleaning nozzle 4 to the surface of the filter screen 2, and the cleaning nozzle 4 is arranged toward the filter screen 2.

[0031] See also Figure 4As shown, regarding the specific structure of the liquid spray pipe 3, at least one liquid spray pipe 3 is provided, and it is arranged along the generatrix direction of the filter screen 2, so that when the filter screen 2 rotates, the cleaning nozzle 4 and the cleaning brush 5 on the liquid spray pipe 3 can clean the entire filter screen 2. Regarding the spacing between the cleaning nozzle 4 and the filter screen 2, the spacing between the cleaning nozzle 4 and the upper surface of the filter screen 2 is set to 1-5 cm, so that the cleaning nozzle 4 can effectively flush and clean the filter screen 2. In this embodiment, four liquid spray pipes 3 are arranged at equal intervals along the circumferential direction of the filter screen 2, each liquid spray pipe 3 is arranged parallel to the generatrix of the filter screen 2, and the uppermost end of each liquid spray pipe 3 is connected, and the lower end of each liquid spray pipe 3 (close to the lower end of the filter screen 2) is fixed to the inner wall of the desulfurization and denitrification tower body 1 through a connector 13. The multiple liquid spray pipes 3 of this embodiment can form a stable liquid spray structure above the filter screen.

[0032] The cleaning mechanism of the present embodiment can be arranged on the upper surface and / or the lower surface of the filter 2. The cleaning mechanism is arranged on the upper surface of the filter 2, so that the flue gas and the desulfurization and denitrification agent reaction mixture on the upper surface of the filter 2 can be cleaned; the lower surface of the filter 2 is directly in contact with the flue gas entering from the flue gas inlet 101, and there are more dust and impurities. The cleaning mechanism is arranged on the lower surface of the filter 2, so that the dust and impurities on the lower surface of the filter 2 can be cleaned. Since the mixture may agglomerate on the upper surface of the filter 2 for a long time, it brings difficulty to cleaning. For this reason, the present embodiment adopts a solution in which the cleaning mechanism can be arranged on the upper surface of the filter 2.

[0033] In order to reduce the occupied area of ​​the cleaning mechanism, this embodiment uses the liquid in the raw liquid tank to flush and clean the filter screen 2. For this purpose, a liquid spray pipe 3 is arranged to be connected with the spray pipe 8 through a connecting pipe 9 with a switch. A valve switch is also provided on the spray pipe 8. According to actual conditions, the cleaning nozzle 4 and the desulfurization and denitrification nozzle 7 can work simultaneously or separately.

Claims

1. A flue gas desulfurization, denitration and dust removal device, comprising a desulfurization and denitration tower body (1), wherein the desulfurization and denitration tower body (1) is provided with a flue gas inlet (101) at the bottom and a flue gas outlet (102) at the top, characterized in that: A filtering mechanism and a spraying mechanism capable of spraying desulfurization and denitrification agents downward are arranged in sequence from bottom to top inside the desulfurization and denitrification tower body (1), and a cleaning mechanism is arranged on the filtering mechanism; The filtering mechanism comprises a filter screen (2) rotatably arranged in a desulfurization and denitration tower body (1) and a rotatable rotating shaft (10), the axis of the filter screen (2) is parallel to or coincides with the axis of the desulfurization and denitration tower body (1), the axis of the rotating shaft (10) is consistent with the axis of the filter screen (2), and one end of the rotating shaft (10) is connected to the middle of the filter screen (2); The cleaning mechanism comprises a liquid spray pipe (3) and a plurality of cleaning nozzles (4) which are connected to each other. The liquid spray pipe (3) is connected to the inner wall of the desulfurization and denitration tower body (1), and its length direction is arranged in coordination with the upper surface of the filter screen (2). The cleaning nozzle (4) is arranged toward the filter screen (2), and a cleaning brush (5) is arranged on the outer side of each cleaning nozzle (4), and one end of the cleaning brush (5) extends to the surface of the filter screen (2).

2. A flue gas desulfurization, denitrification and dust removal device according to claim 1, characterized in that: The filter screen (2) is a conical filter screen (2).

3. A flue gas desulfurization, denitrification and dust removal device according to claim 2, characterized in that: At least one liquid spray pipe (3) is provided and arranged along the generatrix direction of the filter screen (2).

4. The flue gas desulfurization, denitrification and dust removal device according to claim 1, characterized in that: The spray mechanism comprises a desulfurization and denitration nozzle (7) and a spray pipe (8) connected thereto, and the spray pipe (8) is connected to the raw liquid tank.

5. A flue gas desulfurization, denitrification and dust removal device according to claim 4, characterized in that: The liquid spray pipe (3) is connected to the spray pipe (8) via a connecting pipe (9) with a switch.

6. The flue gas desulfurization, denitrification and dust removal device according to claim 1, characterized in that: An annular support seat (6) is provided inside the desulfurization and denitration tower body (1), and the lower end of the filter screen (2) is arranged on the annular support seat (6) and is slidably connected thereto.

7. A flue gas desulfurization, denitrification and dust removal device according to claim 1 or 2, characterized in that: The distance between the cleaning nozzle (4) and the upper surface of the filter screen (2) is 1-5 cm.

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