A flue gas purification system for lignite units

Abstract

The invention discloses a lignite unit flue gas purification system, which relates to the technical field of flue gas treatment, including a smoke exhaust pipe, a filter housing and a filter screen assembly, wherein the filter housing is fixedly arranged on the smoke exhaust pipe, the filter screen assembly is rotatably arranged in the filter housing, a plurality of filter screen frames are rotatably arranged on a driving disk, the rotation of the driving disk drives the plurality of filter screen frames to rotate, and then the filter screen in the smoke pipe is replaced, and particles on the filter screen are removed by a protrusion fixedly arranged on the filter housing and a rotatably arranged cleaning brush, so that the filter screen assembly can perform long-term and effective filtering treatment on the smoke, moisture in the smoke can be removed by a drying and condensing unit, and a plurality of condensing plates are rotatably arranged in the condensing housing, the dehydration strength of the drying and condensing unit is adjusted by adjusting the deflection angle of the condensing plates, so that the moisture in the smoke can be completely removed, and then the smoke purification efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, in particular to a lignite unit flue gas purification system. Background Art

[0002] Coal-fired power generation units are mechanical equipment that converts the chemical energy of fossil fuels such as coal into electrical energy. They are mainly used in thermal power plants. Lignite is the main type of coal used in thermal power plants. However, due to the low degree of coalification of lignite, the flue gas produced during the combustion of lignite contains a large amount of particulate matter, sulfur dioxide, nitrogen oxides and other pollutants. Direct emissions will pose a serious threat to the environment and human health, and the flue gas needs to be purified before being discharged.

[0003] At present, the steps of lignite flue gas purification mainly include dust removal, drying and dehydration, and desulfurization and denitrification. At present, dust removal mainly adopts bag dust collector for dust removal. However, due to the large amount of particulate matter in lignite, the dust removal efficiency of dust removal equipment is reduced after long-term use. In addition, with the accumulation of particulate matter, the dust removal resistance will increase, thereby affecting the air volume of the dust removal system and even damaging the dust removal equipment.

[0004] Therefore, it is necessary to provide a lignite unit flue gas purification system to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a lignite unit flue gas purification system, comprising a dust removal and filtration unit, a drying and condensing unit, a desulfurization unit and a denitrification unit, wherein the desulfurization unit uses a wet desulfurization technology for desulfurization, and the denitrification unit uses a selective catalytic reduction method for denitrification;

[0006] The dust removal and filtering unit comprises a smoke exhaust pipe, a filter housing and a filter assembly, wherein the filter housing is fixedly arranged on the smoke exhaust pipe, the smoke exhaust pipe is fan-shaped, a filter assembly is rotatably arranged in the filter housing, and a slide groove for sliding the filter assembly is provided on the smoke exhaust pipe, a conical dust exhaust cavity is arranged at the bottom of the filter housing, and the dust exhaust cavity is connected to the dust exhaust pipe outside;

[0007] The drying condensation unit includes a smoke inlet pipe, a condensation shell and a condensation plate, wherein a smoke inlet pipe is fixedly arranged at the bottom end of the condensation shell, a plurality of condensation plates are staggeredly arranged in the condensation shell, and an electric telescopic rod is hinged between the condensation plate and the condensation shell.

[0008] Further, preferably, the filter mesh assembly includes a drive disk and a filter mesh frame, wherein a plurality of filter mesh frames are arranged on the drive disk for circular rotation, the filter mesh frames slide along the slide groove, a filter mesh is laid in the filter mesh frame, and the filter mesh is in the same fan shape as the smoke exhaust pipe.

[0009] Further, as a preference, a limiting groove is provided on the bottom of the filter rack, and a clamping groove is provided on the filter rack;

[0010] A plurality of clamping rods are fixedly arranged on the driving disk, and the clamping rods are clamped into the clamping slots and slide along the clamping slots, and the driving disk can be clamped into the limiting slots.

[0011] Further, as a preference, a support plate 1 is fixedly provided on the filter frame;

[0012] A plurality of support plates 2 are fixedly arranged on the driving disk, and a spring is fixedly arranged between the support plates 1 and 2.

[0013] Further, as a preference, a plurality of protrusions are provided in the filter housing, and a slope is provided on the protrusions;

[0014] A guide rod is fixedly arranged on the outer side of the filter frame, and the guide rod can slide along the inclined surface.

[0015] Further, as a preference, a driving rod is fixedly provided on the driving disc, the driving rod is driven by a motor, and a bevel gear 1 is fixedly provided on the driving rod;

[0016] A rotating shaft is rotatably arranged in the filter housing, a cleaning brush is fixedly arranged on the rotating shaft in a circumferential manner, one end of the rotating shaft close to the driving disk penetrates the filter housing and is fixedly arranged with a second bevel gear, and the first bevel gear is meshed with the second bevel gear.

[0017] Furthermore, preferably, a cooling pipe is laid in the condensation plate, and the cooling pipe is connected to an external cooling circulation mechanism.

[0018] Further, as a preference, the condensation plate is provided with a plurality of water flow channels 1;

[0019] The condensing shell is provided with a plurality of water flow channels 2;

[0020] A conical water collecting chamber is arranged at the bottom of the condensing shell, and the water collecting chamber is connected with an external water collecting mechanism through a water collecting pipe.

[0021] Compared with the prior art, the present invention provides a lignite unit flue gas purification system, which has the following beneficial effects:

[0022] The present invention is equipped with a dust removal and filtering unit, and a filter assembly is used to filter particulate matter in the flue gas. A driving disk is provided in the filter assembly, and a plurality of filter racks are deflectedly provided on the driving disk. The rotation of the driving disk drives the plurality of filter racks to rotate, and then the filter in the flue pipe is replaced, and the particles on the filter are removed by the protrusions fixedly provided on the filter housing and the cleaning brush provided in rotation, so that the filter assembly can perform long-term and effective filtering treatment on the flue gas, thereby effectively improving the dust removal efficiency of the dust removal and filtering unit, and can adjust the rotation speed of the driving disk according to the amount of flue gas in the exhaust pipe, thereby changing the replacement speed and cleaning intensity of the filter. In addition, the moisture in the flue gas can be removed by the drying and condensing unit, and a plurality of condensing plates are deflectedly provided in the condensing housing, and the dehydration intensity of the drying and condensing unit is adjusted by adjusting the deflection angle of the condensing plate, so that the moisture in the flue gas can be completely removed, and the dehydration intensity is adjusted in real time according to the amount of flue gas and the water content of the flue gas, thereby effectively improving the purification efficiency of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the dust removal and filtering unit in the present invention.

[0024] Figure 2 It is a schematic diagram of the overall structure of the drying and condensing unit in the present invention.

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the dust removal and filtering unit in the present invention.

[0026] Figure 4 It is a structural schematic diagram of the filter screen assembly in the present invention.

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the drying and condensing unit in the present invention.

[0028] Figure 6 It is a schematic diagram of the cross-sectional structure of the condensation plate in the present invention.

[0029] In the figure: 1. exhaust pipe; 2. filter housing; 21. dust exhaust chamber; 22. dust exhaust pipe; 23. bump; 24. rotating shaft; 25. cleaning brush; 26. bevel gear 2; 3. filter assembly; 31. drive disc; 311. clamping rod; 312. support plate 2; 313. spring; 314. drive rod; 315. bevel gear 1; 316. motor; 32. filter rack; 321. limit groove; 322. clamping groove; 323. support plate 1; 324. guide rod; 33. filter; 4. smoke inlet pipe; 5. condensation housing; 51. water channel 2; 52. water collecting chamber; 6. condensation plate; 61. cooling pipe; 62. water channel 1; 7. electric telescopic rod. DETAILED DESCRIPTION

[0030] See also Figure 1 to Figure 6 In an embodiment of the present invention, a lignite unit flue gas purification system includes a dust removal and filtering unit, a drying and condensing unit, a desulfurization unit and a denitrification unit, wherein the desulfurization unit uses a wet desulfurization technology to perform desulfurization, and the denitrification unit uses a selective catalytic reduction method to perform denitrification;

[0031] The dust removal and filtering unit comprises a smoke exhaust pipe 1, a filter housing 2 and a filter assembly 3, wherein the filter housing 2 is fixedly arranged on the smoke exhaust pipe 1, the smoke exhaust pipe 1 is fan-shaped, the filter assembly 3 is rotatably arranged in the filter housing 2, and a slide groove for sliding the filter assembly 3 is provided on the smoke exhaust pipe 1, a conical dust exhaust cavity 21 is provided at the bottom of the filter housing 2, and a dust exhaust pipe 22 is connected to the outside of the dust exhaust cavity 21;

[0032] The drying condensation unit includes a smoke inlet pipe 4, a condensation shell 5 and a condensation plate 6, wherein the smoke inlet pipe 4 is fixedly arranged at the bottom end of the condensation shell 5, a plurality of condensation plates 6 are staggeredly arranged in the condensation shell 5, and an electric telescopic rod 7 is hinged between the condensation plate 6 and the condensation shell 5.

[0033] During implementation, the flue gas is sequentially passed into the dust removal and filtering unit, the drying and condensing unit, the desulfurization unit and the denitrification unit for purification, so that the purified flue gas meets the emission standards. After the flue gas passes into the exhaust pipe 1, it is filtered through the filter assembly 3 so that the particulate matter in the flue gas is filtered and removed. In this process, the filter frame 32 is driven by the driving disk 31 to drive the filter 33 to slide along the slide groove, so that the filter 33 in the exhaust pipe 1 is replaced. The replaced filter 33 vibrates under the action of the protrusion 23 and the spring 313, so that most of the particles in the filter 33 are shaken out, and the fine particles in the filter 33 are further brushed out by the cleaning brush 25, so that the filter 33 can be effectively cleaned, so that the filter 33 in the exhaust pipe 1 is always kept in a clean state, thereby effectively improving the filtering effect of the filter assembly 3, and in the filtering process, it can be adjusted in real time according to the content of particulate matter in the flue gas and the amount of flue gas. The rotation speed of the driving disk 31 is adjusted, thereby adjusting the replacement speed and cleaning intensity of the filter 33, so that the filter assembly 3 can be suitable for flue gas filtration in various situations, and then the filtered flue gas is passed into the smoke inlet pipe 4, and the flue gas entering the smoke inlet pipe 4 flows from the bottom of the condensation shell 5 to the top of the condensation shell 5. During the flow, the flue gas contacts a plurality of staggered condensation plates 6, so that the moisture in the flue gas condenses into water and flows into the water collecting chamber 52. In this process, the inclination angle of the condensation plate 6 can be adjusted in real time according to the water content and the flue gas volume in the flue gas, so that the rate at which the flue gas passes through the condensation shell 5 is changed, thereby changing the condensation effect of the drying condensation unit, so that the drying condensation unit can be suitable for flue gas dehydration in various situations while ensuring the removal of moisture in the flue gas, and then the dried flue gas is discharged after being treated with desulfurization and denitrification, so that the discharged flue gas is cleaner and less polluting to the environment.

[0034] In this embodiment, Figure 4 The filter assembly 3 includes a driving disk 31 and a filter rack 32, wherein a plurality of filter racks 32 are arranged on the driving disk 31 in a circular rotation, the filter racks 32 slide along the slide groove, a filter 33 is laid in the filter rack 32, and the filter 33 is in the same fan shape as the smoke exhaust pipe 1.

[0035] In particular, a fan-shaped smoke exhaust pipe 1 and a fan-shaped filter 33 are provided so that the filter 33 can be effectively replaced by rotating the drive disk 31, and during the replacement process, the filter 33 in the multiple filter racks 32 always covers the entire smoke exhaust pipe 1, thereby effectively improving the filtering efficiency.

[0036] In this embodiment, Figure 4 The bottom of the filter rack 32 is provided with a limiting groove 321, and the filter rack 32 is provided with a clamping groove 322;

[0037] A plurality of clamping rods 311 are fixedly disposed on the driving disk 31 . The clamping rods 311 are clamped into the clamping slots 322 and slide along the clamping slots 322 . The driving disk 31 can be clamped into the limiting slots 321 .

[0038] In particular, the driving disk 31 can effectively drive the filter rack 32 to rotate through the clamping rod 311, and the clamping rod 311 can slide along the clamping groove 322, so that when the filter rack 32 is deflected, the driving disk 31 can still drive the filter rack 32 to rotate.

[0039] In this embodiment, Figure 4 A support plate 323 is fixedly provided on the filter frame 32;

[0040] A plurality of second support plates 312 are fixedly disposed on the driving disk 31 , and a spring 313 is fixedly disposed between the first support plate 323 and the second support plate 312 .

[0041] In this embodiment, Figure 3 and Figure 4 , a plurality of protrusions 23 are provided in the filter housing 2, and a slope is provided on the protrusion 23;

[0042] A guide rod 324 is fixedly disposed on the outer side of the filter frame 32 , and the guide rod 324 can slide along the inclined surface.

[0043] In this embodiment, Figure 3 A driving rod 314 is fixedly provided on the driving disk 31, and the driving rod 314 is driven by a motor 316. A bevel gear 315 is fixedly provided on the driving rod 314;

[0044] A rotating shaft 24 is rotatably provided in the filter housing 2 , a cleaning brush 25 is fixedly provided on the rotating shaft 24 in a circumferential manner, one end of the rotating shaft 24 close to the driving disk 31 penetrates the filter housing 2 and is fixedly provided with a bevel gear 26 , and the bevel gear 1 315 is meshed with the bevel gear 26 .

[0045] During implementation, when the filter rack 32 rotates so that the guide rod 324 contacts the protrusion 23, the guide rod 324 slides along the inclined surface, thereby causing the filter rack 32 to deflect, that is, the end of the filter rack 32 having the guide rod 324 is lifted, and then when the guide rod 324 is separated from the inclined surface, the filter rack 32 is reset under the action of the spring 313, and hits the driving disk 31 under the action of the limiting groove 321, so that the particles adhered to the surface of the filter 33 and stuck in the surface layer of the filter 33 are shaken out. And it falls into the dust exhaust chamber 21, and then the rotating shaft 24 rotates under the action of bevel gear 1 315 and bevel gear 2 26 and drives the cleaning brush 25 to rotate to deeply clean the filter 33, so that the fine particles in the filter 33 are completely removed, and then during the circulation and replacement of the filter assembly 3 in the smoke exhaust pipe 1, the filter 33 entering the smoke exhaust pipe 1 is always in a clean state, so that the filter assembly 3 can always maintain a good filtering effect during long-term use, thereby effectively improving the smoke filtration efficiency.

[0046] In this embodiment, Figure 5 and Figure 6 A cooling pipe 61 is laid in the condensation plate 6, and the cooling pipe 61 is connected to an external cooling circulation mechanism.

[0047] In this embodiment, Figure 5 and Figure 6 The condensation plate 6 is provided with a plurality of water flow channels 62;

[0048] The condensation housing 5 is provided with a plurality of water flow channels 51;

[0049] A conical water collecting chamber 52 is provided at the bottom of the condensing shell 5 , and the water collecting chamber 52 is connected to an external water collecting mechanism through a water collecting pipe.

[0050] During implementation, the water droplets condensed on the condensation plate 6 can gather in the water flow channel 1 62, and flow through the water flow channel 1 62 to the water flow channel 2 51, so that the condensed water is effectively collected in the water collecting chamber 52 and discharged through the water collecting pipe, thereby preventing the flue gas from taking away the condensed water again during the upward flow, and effectively improving the dehydration efficiency.

[0051] To sum up, when the present invention is implemented, the filter assembly 3 is used to filter the particulate matter in the flue gas, and the rotation of the driving disk 31 drives the multiple filter racks 32 to rotate, thereby replacing the filter 33 in the flue pipe, and the particles on the filter 33 are removed by the protrusion 23 fixedly arranged on the filter housing 2 and the cleaning brush 25 arranged to rotate, so that the filter assembly 3 can perform long-term and effective filtering treatment on the flue gas, thereby effectively improving the dust removal efficiency of the dust removal filter unit, and can adjust the rotation speed of the driving disk 31 according to the amount of flue gas in the exhaust pipe 1 to change the replacement speed and cleaning intensity of the filter 33. In addition, the moisture in the flue gas can be removed by the drying and condensing unit, and the dehydration intensity of the drying and condensing unit is adjusted by adjusting the deflection angle of the condensation plate 6, so that the moisture in the flue gas can be completely removed, and the dehydration intensity is adjusted in real time according to the flue gas volume and the water content of the flue gas, thereby effectively improving the flue gas purification efficiency.

[0052] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lignite unit flue gas purification system, characterized in that: It includes a dust removal and filtration unit, a drying and condensing unit, a desulfurization unit and a denitration unit, wherein the desulfurization unit uses a wet desulfurization technology for desulfurization, and the denitration unit uses a selective catalytic reduction method for denitration; The dust removal and filtering unit comprises a smoke exhaust pipe (1), a filter housing (2) and a filter screen assembly (3), wherein the filter housing (2) is fixedly arranged on the smoke exhaust pipe (1), the smoke exhaust pipe (1) is fan-shaped, the filter screen assembly (3) is rotatably arranged in the filter housing (2), and a slide groove for the filter screen assembly (3) to slide is provided on the smoke exhaust pipe (1), a conical dust exhaust cavity (21) is provided at the bottom of the filter housing (2), and the dust exhaust cavity (21) is externally connected to the dust exhaust pipe (22); The drying condensation unit comprises a smoke inlet pipe (4), a condensation shell (5) and a condensation plate (6), wherein the smoke inlet pipe (4) is fixedly arranged at the bottom end of the condensation shell (5), a plurality of condensation plates (6) are staggeredly rotatably arranged in the condensation shell (5), and an electric telescopic rod (7) is hinged between the condensation plate (6) and the condensation shell (5); The filter screen assembly (3) comprises a drive disk (31) and a filter screen frame (32), wherein a plurality of filter screen frames (32) are arranged on the drive disk (31) to rotate in a circular motion, the filter screen frames (32) slide along the slide grooves, a filter screen (33) is laid in the filter screen frame (32), and the filter screen (33) is in the same sector shape as the smoke exhaust pipe (1); A limiting groove (321) is provided at the bottom of the filter mesh frame (32), and a clamping groove (322) is provided on the filter mesh frame (32); A plurality of clamping rods (311) are fixedly arranged on the driving disk (31), and the clamping rods (311) are clamped into the clamping grooves (322) and slide along the clamping grooves (322), so that the driving disk (31) can be clamped into the limiting grooves (321); A support plate 1 (323) is fixedly arranged on the filter frame (32); A plurality of second support plates (312) are fixedly arranged on the driving disk (31), and a spring (313) is fixedly arranged between the first support plate (323) and the second support plate (312); A plurality of protrusions (23) are provided in the filter housing (2), and a slope is provided on the protrusion (23); A guide rod (324) is fixedly arranged on the outside of the filter frame (32), and the guide rod (324) is capable of sliding along the inclined surface; During implementation, the filter rack (32) is driven by the driving disk (31) to drive the filter (33) to slide along the slide groove, thereby replacing the filter (33) in the smoke exhaust pipe (1). When the filter rack (32) rotates so that the guide rod (324) contacts the protrusion (23), the guide rod (324) slides along the inclined surface, thereby causing the filter rack (32) to deflect. One end of the filter rack (32) having the guide rod (324) is lifted. Subsequently, when the guide rod (324) is separated from the inclined surface, the filter rack (32) is reset under the action of the spring 313 and is locked in the limit groove ( The filter (321) impacts the driving disk (31) under the action of the driving disk (321), so that particles adhering to the surface of the filter (33) and stuck in the surface layer of the filter (33) are shaken out, and the filter (33) is effectively cleaned, thereby allowing the filter (33) in the smoke exhaust pipe (1) to always remain in a clean state, effectively improving the filtering effect of the filter assembly (3), and during the filtering process, the rotation speed of the driving disk (31) is adjusted in real time according to the content of particulate matter in the smoke and the amount of smoke, thereby adjusting the replacement speed and cleaning intensity of the filter (33), thereby making the filter assembly (3) suitable for smoke filtering in various situations.

2. A lignite unit flue gas purification system according to claim 1, characterized in that: A driving rod (314) is fixedly disposed on the driving disk (31), the driving rod (314) is driven by a motor (316), and a bevel gear 1 (315) is fixedly disposed on the driving rod (314); A rotating shaft (24) is rotatably disposed in the filter housing (2), a cleaning brush (25) is fixedly disposed on the rotating shaft (24) in a circumferential manner, one end of the rotating shaft (24) close to the driving disk (31) penetrates the filter housing (2) and is fixedly disposed with a second bevel gear (26), and the first bevel gear (315) is meshed with the second bevel gear (26).

3. A lignite unit flue gas purification system according to claim 1, characterized in that: A cooling pipe (61) is laid in the condensation plate (6), and the cooling pipe (61) is connected to an external cooling circulation mechanism.

4. A lignite unit flue gas purification system according to claim 1, characterized in that: A plurality of water flow channels (62) are provided on the condensation plate (6); A plurality of water flow channels 2 (51) are provided on the condensation housing (5); A conical water collection chamber (52) is provided at the bottom of the condensing shell (5), and the water collection chamber (52) is connected to an external water collection mechanism via a water collection pipe.

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