Biomass flue gas dust removal and denitration integrated treatment device

Abstract

The utility model relates to the technical field of biomass SCR (Selective Catalytic Reduction) denitration, in particular to a biomass flue gas dust removal and denitration integrated treatment device which comprises a barrel body, the bottom of the barrel body is conical, a dust discharge port is formed in the bottom of the barrel body, an intercepting net is fixed in the middle of the interior of the barrel body, and a catalyst layer is arranged in the barrel body above the intercepting net. A cyclone dust removal assembly is arranged in the cylinder body below the intercepting net, an air outlet is formed in the top of the cylinder body, and an air inlet is formed in the side wall of the cylinder body at the end of the cyclone dust removal assembly. According to the utility model, dust removal and denitration are integrated, particles and dust in flue gas are separated through the cyclone dust collector before denitration of the SCR reactor, the flue gas after dust removal rises and is further filtered through the intercepting net, and finally denitration is carried out, so that the problems of dust deposition and blockage of a catalyst are solved, the activity failure time of the catalyst is prolonged, and the energy consumption is reduced; and project investment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of biomass SCR denitrification, in particular to an integrated treatment device for biomass flue gas dust removal and denitrification. Background Art

[0002] As the country deepens its efforts to control air pollution, local governments have become more proactive in air pollution control. Most power plants did not consider the requirements for later denitrification and desulfurization capacity expansion during their initial construction, and the denitrification and desulfurization sites were very compact, which greatly increased the difficulty of later capacity expansion.

[0003] Selective Catalytic Reduction (SCR) flue gas denitrification is a technology widely used in biomass power plants to control NOx emissions. The SCR reactor is usually arranged outside the furnace, which is a high-ash arrangement. Since the SCR is arranged before the bag filter, high-concentration dust-containing flue gas enters the cyclone, some large particles settle into the cyclone ash hopper, and some enter the SCR reactor with the flue gas. After a long operation time, it is easy to cause bridging and blockage on the catalyst surface, which will seriously affect the catalyst activity and even cause catalyst collapse. Therefore, the use of integrated dust removal and denitrification can solve the risk of large particles blocking the catalyst and ash accumulation. Ensuring catalyst activity is the key to the stable operation of the SCR denitrification reactor.

[0004] Chinese patent CN212348290U discloses an integrated dust removal, desulfurization and denitrification treatment device, which includes a reaction tank, a support frame is installed at the lower end of the reaction tank, a denitrification structure is installed at the lower end of the inner cavity of the reaction tank, a dry dust collector is installed in the reaction tank, and the dry dust collector is located at the upper end of the denitrification structure, a desulfurization structure is installed in the reaction tank, and the desulfurization structure is located at the upper end of the dry dust collector, the reaction tank is equipped with a wet electrostatic precipitator, and the wet electrostatic precipitator is located at the upper end of the desulfurization structure, and an activated carbon layer is installed at the upper end of the reaction tank, the upper end of the reaction tank is connected to a smoke exhaust pipe, and the lower end of the reaction tank is connected to a smoke inlet pipe; the integrated dust removal, desulfurization and denitrification treatment device can effectively desulfurize and denitrify the flue gas through the denitrification structure and the desulfurization structure, and the denitrification structure can be disassembled, which is convenient for replacement, ensuring the denitrification function, and when desulfurization is performed, the flue gas is filled into an alkali liquid pool, which can effectively perform desulfurization.

[0005] The above patent integrates denitrification, dust removal and desulfurization, but the dry dust collector is installed at the upper end of the denitrification structure. After running for a period of time, it is easy to cause bridging and blockage on the catalyst surface, which will seriously affect the catalyst activity and greatly reduce the service life of the catalyst. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to propose an integrated biomass flue gas dust removal and denitrification treatment device, which solves the problem of catalyst blockage or collapse due to dust accumulation in the reactor by arranging a cyclone dust collector in the SCR denitrifier to remove dust before denitrification.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A biomass flue gas dust removal and denitrification integrated treatment device, comprising a cylinder, the bottom of the cylinder is conical, a dust discharge port is provided at the bottom of the cylinder, an interception net is fixed in the middle of the cylinder, a catalyst layer is provided in the cylinder above the interception net, a cyclone dust removal assembly is provided in the cylinder below the interception net, an air outlet is provided at the top of the cylinder, and an air inlet is provided on the side wall of the cylinder located at the end of the cyclone dust removal assembly;

[0009] The cyclone dust removal assembly includes an upper partition, a lower partition and a plurality of cyclones, wherein the plurality of cyclones are evenly distributed in a cylinder located at the air inlet, the upper partition is fixed in the cylinder above the air inlet, the lower partition is fixed in the cylinder below the air inlet, the tops of the plurality of cyclones extend out of the upper partition, and the bottoms of the plurality of cyclones extend out of the lower partition.

[0010] Preferably, the cyclone includes a separation cylinder and a gas exhaust pipe. The lower end of the separation cylinder is conical and a limiting ring is also provided at the lower end of the separation cylinder. One end of the gas exhaust pipe is located in the separation cylinder and the other end extends out of the top of the separation cylinder. A plurality of swirl blades are connected between the outer wall of the gas exhaust pipe located in the separation cylinder and the inner wall of the separation cylinder. The plurality of swirl blades are arranged along the top of the inner wall of the separation cylinder and are evenly distributed. An extension pipe is also connected to the top of the gas exhaust pipe.

[0011] Preferably, the top of the extension tube extends out of the upper baffle, the lower end of the separation tube extends out of the lower baffle, and the angle between the swirl blade and the horizontal plane is 25-35°.

[0012] Preferably, the catalyst layer comprises multiple layers of catalyst, there are gaps between adjacent layers of the catalyst, and a catalyst support grid is provided under each layer of the catalyst, and the catalyst support grid is fixed on the inner wall of the cylinder.

[0013] Preferably, a temperature sensor is also installed on the inner wall of the cylinder, and the temperature sensor is located between the bottom catalyst support grid and the interception net; the temperature sensor is also electrically connected to a temperature controller, and the temperature controller is electrically connected to a heater, and the heater is fixed in the air inlet.

[0014] Preferably, the limiting ring abuts against the lower partition.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The treatment device designed by the utility model integrates dust removal and denitrification, separates particles and dust in the flue gas through a cyclone dust collector before denitrification in the SCR reactor, the flue gas after dust removal rises, is further filtered through an interception net, and finally denitrification is carried out, thus solving the problems of dust accumulation and clogging of the catalyst, improving the catalyst activity failure time, saving project floor space, saving energy consumption, and reducing project investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a biomass flue gas dust removal and denitrification integrated treatment device proposed by the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of a nozzle assembly of a construction dust-proof spray device proposed by the present invention;

[0019] In the figure: wherein: 1, cylinder; 2, air inlet; 3, catalyst layer; 4, cyclone dust removal assembly; 5, air outlet; 6, interception net; 7, dust outlet; 8, temperature sensor; 9, temperature controller; 10, heater; 31, catalyst; 32, catalyst support grid; 41, cyclone; 42, upper partition; 43, lower partition; 411, separation cylinder; 412, swirl blade; 413, gas discharge pipe; 414, extension pipe; 415, limit ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example

[0022] like Figure 1-2 As shown, a biomass flue gas dust removal and denitrification integrated treatment device comprises a cylinder 1, the bottom of the cylinder 1 is conical, a dust discharge port 7 is arranged at the bottom of the cylinder 1, an interception net 6 is fixed in the middle of the cylinder 1, a catalyst layer 3 is arranged in the cylinder 1 above the interception net 6, a cyclone dust removal component 4 is arranged in the cylinder 1 below the interception net 6, an air outlet 5 is arranged at the top of the cylinder 1, and an air inlet 2 is arranged on the side wall of the cylinder 1 at the end of the cyclone dust removal component 4;

[0023] The cyclone dust removal assembly 4 includes an upper partition 42, a lower partition 43 and a plurality of cyclones 41. The plurality of cyclones 41 are evenly distributed in the cylinder 1 located at the air inlet 2. The upper partition 42 is fixed in the cylinder 1 above the air inlet 2, and the lower partition 43 is fixed in the cylinder 1 below the air inlet 2. The tops of the plurality of cyclones 41 extend out of the upper partition 42, and the bottoms of the plurality of cyclones 41 extend out of the lower partition 43.

[0024] The dusty flue gas enters the cylinder 1 from the air inlet 2, and is sealed between the upper baffle 42 and the lower baffle 43. The dusty flue gas enters the cyclone 41 for gas-solid separation.

[0025] In this embodiment, the cyclone 41 includes a separation cylinder 411 and a gas exhaust pipe 413. The lower end of the separation cylinder 411 is conical, and a limiting ring 415 is also provided at the lower end of the separation cylinder 411. One end of the gas exhaust pipe 413 is located in the separation cylinder 411, and the other end extends out of the top of the separation cylinder 411. A plurality of swirl blades 412 are connected between the outer wall of the gas exhaust pipe 413 located in the separation cylinder 411 and the inner wall of the separation cylinder 411. The plurality of swirl blades 412 are arranged along the top of the inner wall of the separation cylinder 411 and are evenly distributed. An extension pipe 414 is also connected to the top of the gas exhaust pipe 413.

[0026] The dust-laden flue gas enters the separation cylinder 411 through the swirl blades 412, and is separated into gas and solid under the action of centrifugal force. The particles in the dust-laden flue gas settle downward due to their weight and fall into the cone at the lower part of the cylinder 1, and are discharged through the dust outlet 7. The flue gas rises through the gas exhaust pipe 413, and is discharged through the extension pipe 414 to the space between the interception net 6 and the upper partition 42. The rising flue gas is further filtered out with smaller dust through the interception net 6, and finally enters the catalyst layer 3.

[0027] In this embodiment, the top of the extension tube 414 extends out of the upper baffle 42, the lower end of the separation cylinder 411 extends out of the lower baffle 43, and the angle between the swirl blade 412 and the horizontal plane is 25-35 degrees.

[0028] In this embodiment, the catalyst layer 3 includes multiple layers of catalysts 31 , and there are gaps between adjacent layers of the catalysts 31 . A catalyst support grid 32 is provided under each layer of the catalyst 31 , and the catalyst support grid 32 is fixed on the inner wall of the cylinder 1 .

[0029] The catalyst support grid 32 is fixed on the inner wall of the cylinder 1 and is used to place the catalyst 31. The flue gas passes through the interception net 6 to filter out small dust and enters the catalyst layer 3, and undergoes a denitration reaction with the multi-layer catalyst 31. Finally, the denitrated flue gas is discharged from the cylinder 1 through the gas outlet 5 and sent to the downstream device. The dust and particulate matter in the flue gas are separated by the cyclone 41 and the interception net 6, which greatly reduces the risk of catalyst dust accumulation and clogging, increases the catalyst activity failure time, and increases the service life of the catalyst.

[0030] In this embodiment, a temperature sensor 8 is also installed on the inner wall of the cylinder 1, and the temperature sensor 8 is located between the bottom catalyst support grid 32 and the interception net 6; the temperature sensor 8 is also electrically connected to a temperature controller 9, and the temperature controller 9 is electrically connected to a heater 10, and the heater 10 is fixed in the air inlet 2.

[0031] The flue gas requires a certain temperature for the denitration reaction. The temperature sensor 8 is used to monitor the temperature inside the cylinder 1 and display it on the temperature controller. When the monitored temperature is lower than the temperature range required for the reaction, the temperature controller 9 controls the heater 10 to heat and maintain a constant temperature, thereby ensuring the normal reaction conditions of the denitration reaction.

[0032] In this embodiment, the limiting ring 415 abuts against the lower partition plate 43 .

[0033] The working principle of the integrated treatment device for dust removal and denitrification of biomass flue gas in the utility model is as follows:

[0034] The dusty flue gas enters the space between the upper baffle 42 and the lower baffle 43 in the cylinder 1 from the air inlet 2, and enters the separation cylinder 411 through the swirl blade 412. Under the action of centrifugal force, gas-solid separation is performed. The particles in the dusty flue gas settle downward due to weight and fall into the cone at the bottom of the cylinder 1. The flue gas rises through the gas discharge pipe 413 and is discharged from the extension pipe 414 to the space between the interception net 6 and the upper baffle 42. The rising flue gas enters the catalyst layer 3 after filtering out small dust through the interception net 6, and reacts with the multi-layer catalyst 31 for denitration. Finally, the denitrated flue gas is discharged from the cylinder 1 through the air outlet 5 and sent to the downstream device. The temperature sensor 8 is used to monitor the temperature in the cylinder 1 and display it on the temperature controller 9. When the temperature is lower than the temperature range required for the reaction, the temperature controller 9 controls the heater 10 to heat and maintain a constant temperature, thereby ensuring the normal reaction conditions of the denitration reaction.

[0035] The above description 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 within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A biomass flue gas dust removal and denitrification integrated treatment device, comprising a cylinder (1), characterized in that: The bottom of the cylinder (1) is conical, a dust discharge port (7) is provided at the bottom of the cylinder (1), an interception net (6) is fixed in the middle of the cylinder (1), a catalyst layer (3) is fixed in the cylinder (1) above the interception net (6), a cyclone dust removal assembly (4) is fixed in the cylinder (1) below the interception net (6), an air outlet (5) is provided at the top of the cylinder (1), and an air inlet (2) is provided on the side wall of the cylinder (1) at the end of the cyclone dust removal assembly (4); The cyclone dust removal assembly (4) comprises an upper partition (42), a lower partition (43) and a plurality of cyclones (41); the plurality of cyclones (41) are evenly distributed in a cylinder (1) located at an air inlet (2); the upper partition (42) is fixed in the cylinder (1) above the air inlet (2); the lower partition (43) is fixed in the cylinder (1) below the air inlet (2); the tops of the plurality of cyclones (41) extend out of the upper partition (42); and the bottoms of the plurality of cyclones (41) extend out of the lower partition (43).

2. The integrated biomass flue gas dust removal and denitrification treatment device according to claim 1 is characterized in that: The cyclone (41) comprises a separation cylinder (411) and a gas discharge pipe (413). The lower end of the separation cylinder (411) is conical. A limiting ring (415) is also provided at the lower end of the separation cylinder (411). One end of the gas discharge pipe (413) is located inside the separation cylinder (411), and the other end extends out of the top of the separation cylinder (411). A plurality of swirl blades (412) are connected between the outer wall of the gas discharge pipe (413) located inside the separation cylinder (411) and the inner wall of the separation cylinder (411). The plurality of swirl blades (412) are arranged along the top of the inner wall of the separation cylinder (411) and are evenly distributed. An extension pipe (414) is also connected to the top of the gas discharge pipe (413).

3. The integrated biomass flue gas dust removal and denitrification treatment device according to claim 2 is characterized in that: The top of the extension tube (414) extends out of the upper baffle (42), the lower end of the separation cylinder (411) extends out of the lower baffle (43), and the angle between the swirl blade (412) and the horizontal plane is 25 to 35 degrees.

4. The integrated biomass flue gas dust removal and denitrification treatment device according to claim 1 is characterized in that: The catalyst layer (3) comprises multiple layers of catalyst (31), there are gaps between adjacent layers of the catalyst (31), a catalyst support grid (32) is provided below each layer of the catalyst (31), and the catalyst support grid (32) is fixed on the inner wall of the cylinder (1).

5. The integrated treatment device for dust removal and denitrification of biomass flue gas according to claim 4 is characterized in that: A temperature sensor (8) is also installed on the inner wall of the cylinder (1), and the temperature sensor (8) is located between the bottom catalyst support grid (32) and the interception net (6); the temperature sensor (8) is also electrically connected to a temperature controller (9), and the temperature controller (9) is electrically connected to a heater (10), and the heater (10) is fixed in the air inlet (2).

6. The biomass flue gas dust removal and denitrification integrated treatment device according to claim 2, characterized in that: The limiting ring (415) abuts against the lower partition (43).

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