SNCR (selective non-catalytic reduction) denitration catalytic device

Abstract

The utility model relates to the technical field of flue gas denitration, in particular to an SNCR (selective non-catalytic reduction) denitration catalytic device which comprises a barrel, one end of the barrel is communicated with an external high-pressure flue gas channel, and a primary mixing mechanism and a secondary mixing mechanism are respectively arranged in the barrel; the primary mixing mechanism comprises a fan arranged in the barrel, the fan is hollow, a plurality of atomizing nozzles are arranged on fan blades of the fan, the fan is fixedly connected to a conveying pipe, the conveying pipe penetrates through the smoke channel to be fixedly connected with the output end of the motor, and the conveying pipe is hollow and communicates with the flow guide part and the hollow area in the fan; the secondary mixing mechanism comprises a mixer arranged in the barrel, and the flue gas and the reducing agent move in the mixer and continuously collide with the mixer. The reducing agent sequentially passes through the conveying pipe and the fan from the flow guide part, is sprayed out through the atomization nozzle and is preliminarily mixed with the flue gas, the motor drives the fan to rotate through the conveying pipe, the flow direction of the flue gas is disturbed, and the mixing uniformity of the flue gas and the fan is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flue gas denitration, in particular to a SNCR denitration catalytic device. BACKGROUND

[0002] SNCR, the full name in English is selective non-catalytic reduction, Chinese name is selective non-catalytic reduction, refers to the effect under the action of no catalyst, in the "temperature window" suitable for denitration reaction Spray reductant reduces nitrogen oxides in flue gas into harmless nitrogen and water. This technology does not use catalyst, so this method is called selective non-catalytic reduction method.

[0003] When using non-selective catalytic reduction method for denitration, flue gas needs to be injected into the denitration furnace, and the reductant is atomized and sprayed out, so that the reductant and flue gas are more uniformly contacted, and the flue gas is denitrated, but some denitration devices are relatively or annularly arranged to spray the reductant more uniformly, which can spray the reductant from multiple angles, but sometimes the reductant will collide with the reductant sprayed by other spray heads during spraying, thereby shortening the range of a single spray head, affecting the uniformity of reductant spraying, and thus reducing the mixing degree of flue gas and reductant, and reducing the denitration effect of flue gas. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a SNCR denitration catalytic device to solve the above-mentioned shortcomings in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A SNCR denitration catalytic device, comprising a cylinder, the cylinder is communicated with the outside high pressure flue gas passage at one end, and the cylinder is respectively provided with a primary mixing mechanism and a secondary mixing mechanism; the primary mixing mechanism comprises a fan arranged in the cylinder, the fan is hollow inside, and a plurality of atomizing nozzles are arranged on the fan blades of the fan, the fan is fixedly connected with a transmission pipe, the transmission pipe is fixedly connected with a motor output end through the flue gas passage, the transmission pipe is hollow inside and is communicated with the flow guide part and the hollow area inside the fan; the secondary mixing mechanism comprises a mixer arranged in the cylinder, and the flue gas and the reductant move in the mixer and continuously collide with the mixer.

[0007] Preferably, the cylinder comprises a horizontal cylinder and a vertical cylinder which are communicated with each other, the connection part of the horizontal cylinder and the vertical cylinder is arranged in an arc shape, the primary mixing mechanism is arranged in the horizontal cylinder, and the secondary mixing mechanism is arranged in the vertical cylinder.

[0008] Preferably, recessed parts are arranged on the corresponding areas of the horizontal cylinder and the vertical cylinder, drain channels are arranged on the recessed parts, and valves are arranged on the drain channels.

[0009] Preferably, the transmission pipe is coaxially arranged with the horizontal cylinder.

[0010] Preferably, the mixer includes a funnel-shaped annular belt fixedly disposed inside a vertical cylinder, with multiple fixing plates fixedly connected to the annular belt, and multiple mixing plates fixedly connected to the fixing plates. Adjacent mixing plates form a mixing channel, and each mixing plate includes multiple interconnected bent sections.

[0011] Preferably, an axial flow fan is fixedly installed at the top of the vertical cylinder.

[0012] Preferably, the flow guiding part includes a bushing that is rotatably connected to the transmission pipe, a slot adapted to the bushing is provided at the connection between the transmission pipe and the bushing, a flow guiding pipe is connected to the bushing, and flow guiding holes are provided on the bushing and the slot, and both ends of the connection between the transmission pipe and the bushing are sealed.

[0013] The SNCR denitrification catalytic device provided by this utility model has the following beneficial effects as described above:

[0014] Through the pre-mixing mechanism, the reducing agent passes through the guide section, the transmission pipe, and the fan in sequence, and is sprayed out through the atomizing nozzle. It is initially mixed with the flue gas flowing in from the flue gas channel. The motor drives the fan to rotate through the transmission pipe, which disrupts the flow direction of the flue gas and further improves the uniformity of the mixing between the flue gas and the fan.

[0015] 2. Through the set two-mixing mechanism, the flue gas and reducing agent move into the mixing channel and continuously collide with the bending section of the mixing plate, which extends the path of the flue gas and reducing agent, making the reaction more thorough. In addition, it also allows the reducing agent droplets to remain in the mixing tube and react with the subsequent flue gas, further improving the utilization rate of the reducing agent.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0017] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0020] Figure 2 A cross-section structure schematic view is provided for the embodiment of the utility model;

[0021] Figure 3 A primary mixing mechanism structure schematic view is provided for the embodiment of the utility model;

[0022] Figure 4 A transmission pipe structure schematic view is provided for the embodiment of the utility model;

[0023] Figure 5 A flow guide part structure schematic view is provided for the embodiment of the utility model;

[0024] Figure 6 A mixer structure schematic view is provided for the embodiment of the utility model;

[0025] Figure 7 A fan structure schematic view is provided for the embodiment of the utility model.

[0026] Mark explanation:

[0027] Cylinder; 11, horizontal cylinder; 12, vertical cylinder; 2, primary mixing mechanism; 21, fan; 22, atomizing nozzle; 23, transmission pipe; 24, motor; 3, flow guide part; 31, shaft sleeve; 32, slot; 33, flow guide pipe; 34, flow guide hole; 4, secondary mixing mechanism; 41, mixer; 410, annular belt; 420, mixing plate; 430, mixing channel; 440, fixed plate; 5, recessed part; 51, liquid discharge channel; 52, valve; 6, axial flow fan. Specific implementation

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0029] Please refer to Figures 1-7The utility model provides an embodiment: a kind of SNCR denitration catalytic device, including cylinder 1, the cylinder 1 one end and external high-pressure flue gas passage are communicated, and cylinder 1 is equipped with respectively initial mixing mechanism 2 and two mixing mechanism 4;The cylinder 1 includes mutually communicating horizontal cylinder 11 and vertical cylinder 12, the junction of the horizontal cylinder 11 and vertical cylinder 12 is arranged in arc, and the initial mixing mechanism 2 is located in horizontal cylinder 11, and the two mixing mechanism 4 is located in vertical cylinder 12.The initial mixing mechanism 2 makes flue gas and reducing agent preliminary mixing, and the two mixing mechanism 4 improves the reaction degree of flue gas and reducing agent.

[0030] The initial mixing mechanism 2 includes fan 21 arranged in cylinder 1, the inside of fan 21 is hollow, and a plurality of atomizing nozzles 22 are arranged on the fan blade of fan 21, the fan 21 is fixedly connected to transmission pipe 23, the transmission pipe 23 is fixedly connected with motor 24 output end through flue gas passage, so that transmission pipe 23 does not hinder the flow of flue gas;The inside of transmission pipe 23 is hollow and is communicated with the hollow region inside fan 21 and flow guide part 3 respectively, and the transmission pipe 23 is coaxially arranged with horizontal cylinder 11.

[0031] Reducing agent sequentially passes through transmission pipe 23 and fan 21 from flow guide part 3, and is sprayed out through atomizing nozzle 22, and is preliminarily mixed with flue gas;Motor 24 drives fan 21 to rotate through transmission pipe 23, disturbs the flow direction of flue gas, and further improves the mixing uniformity of flue gas and fan 21.

[0032] The flow guide part 3 includes shaft sleeve 31 rotationally connected with transmission pipe 23, the connection of transmission pipe 23 and shaft sleeve 31 is provided with slot 32 matched with shaft sleeve 31, the shaft sleeve 31 is connected with flow guide pipe 33, the shaft sleeve 31 and slot 32 are provided with flow guide hole 34, and the connection of transmission pipe 23 and shaft sleeve 31 is sealed at both ends;Flow guide part 3 is connected with external reducing agent source, and reducing agent enters transmission pipe 23 through flow guide pipe 33 and flow guide hole 34 on shaft sleeve 31 and slot 32, and flow guide part 3 enables external reducing agent to enter transmission pipe 23 in rotation.

[0033] The second mixing mechanism 4 comprises a mixer 41 arranged in the barrel 1, and the flue gas and the reducing agent move in the mixer 41 and continuously collide with the mixer 41. The mixer 41 comprises a ring-shaped belt 410 in the shape of a bell mouth fixedly arranged in the vertical barrel 12, a plurality of fixed plates 440 are fixedly connected to the ring-shaped belt 410, a plurality of mixing plates 420 are fixedly connected to the fixed plates 440, adjacent mixing plates 420 form mixing channels 430, and each of the mixing plates 420 comprises a plurality of interconnected bending sections. The flue gas and the reducing agent move into the mixing channels 430 and continuously collide with the bending sections of the mixing plates 420, so that the path of the flue gas and the reducing agent is lengthened, the reaction is more thorough, in addition, the reducing agent droplets are retained in the mixing pipe to react with the subsequent flue gas, and the utilization rate of the reducing agent is further improved.

[0034] Further, the corresponding regions of the horizontal barrel 11 and the vertical barrel 12 are provided with recesses 5, the recesses 5 are provided with liquid discharge channels 51, and the liquid discharge channels 51 are provided with valves 52. The flue gas and the reducing agent product water are accumulated in the recesses 5 and can be discharged by opening the valves 52.

[0035] Further, the top of the vertical barrel 12 is fixedly provided with an axial flow fan 6, the axial flow fan 6 improves the moving speed of the flue gas and the reducing agent in the mixer 41, prevents the slow speed, cannot effectively impact the inner wall of the mixing pipe, and makes the reducing agent droplets unable to be retained in the mixing channels 430.

[0036] Working principle: The reducing agent passes through the transmission pipe 23 and the fan 21 from the flow guide part 3 in sequence, is sprayed out through the atomizing nozzle 22, is preliminarily mixed with the flue gas flowing in from the flue gas channel, the motor 24 drives the fan 21 to rotate through the transmission pipe 23, disturbs the flue gas flow direction, and further improves the mixing uniformity of the flue gas and the fan 21. The flue gas and the reducing agent move into the mixing channels 430 and continuously collide with the bending sections of the mixing plates 420, so that the path of the flue gas and the reducing agent is lengthened, the reaction is more thorough, in addition, the reducing agent droplets are retained in the mixing pipe to react with the subsequent flue gas, and the utilization rate of the reducing agent is further improved.

[0037] The above only describes some exemplary embodiments of the present application by way of illustration, without doubt, for ordinary skilled in the art, without departing from the spirit and scope of the present application, the described embodiments can be modified in various ways. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the present application.

Claims

1. An SNCR denitrification catalytic device, characterized in that: It includes a cylinder (1), one end of which is connected to an external high-pressure flue gas channel, and a primary mixing mechanism (2) and a secondary mixing mechanism (4) are respectively provided inside the cylinder (1). The initial mixing mechanism (2) includes a fan (21) disposed inside the cylinder (1). The fan (21) is hollow inside, and the fan blades of the fan (21) are provided with multiple atomizing nozzles (22). The fan (21) is fixedly connected to the transmission pipe (23). The transmission pipe (23) passes through the flue gas channel and is fixedly connected to the output end of the motor (24). The transmission pipe (23) is hollow inside and is connected to the guide section (3) and the hollow area inside the fan (21) respectively. The two-mixing mechanism (4) includes a mixer (41) located inside the cylinder (1). The flue gas and reducing agent move inside the mixer (41) and continuously collide with the mixer (41).

2. The SNCR denitrification catalytic device according to claim 1, characterized in that, The cylinder (1) includes a horizontal cylinder (11) and a vertical cylinder (12) that are connected to each other. The connection between the horizontal cylinder (11) and the vertical cylinder (12) is arranged in an arc shape. The initial mixing mechanism (2) is located in the horizontal cylinder (11), and the secondary mixing mechanism (4) is located in the vertical cylinder (12).

3. The SNCR denitrification catalytic device according to claim 2, characterized in that, The horizontal cylinder (11) and the vertical cylinder (12) are provided with a recess (5), the recess (5) is provided with a drain channel (51), and the drain channel (51) is provided with a valve (52).

4. The SNCR denitrification catalytic device according to claim 2, characterized in that, The transmission tube (23) is coaxially arranged with the horizontal cylinder (11).

5. The SNCR denitrification catalytic device according to claim 2, characterized in that, The mixer (41) includes a funnel-shaped annular belt (410) fixedly disposed inside a vertical cylinder (12). Multiple fixing plates (440) are fixedly connected to the annular belt (410). Multiple mixing plates (420) are fixedly connected to the fixing plates (440). Adjacent mixing plates (420) form a mixing channel (430). Each mixing plate (420) includes multiple interconnected bent sections.

6. The SNCR denitrification catalytic device according to claim 2, characterized in that, An axial flow fan (6) is fixedly installed at the top of the vertical cylinder (12).

7. The SNCR denitrification catalytic device according to claim 1, characterized in that, The flow guide (3) includes a bushing (31) rotatably connected to the transmission pipe (23). A slot (32) adapted to the bushing (31) is provided at the connection between the transmission pipe (23) and the bushing (31). A flow guide (33) is connected to the bushing (31). A flow guide hole (34) is provided on the bushing (31) and the slot (32). Both ends of the connection between the transmission pipe (23) and the bushing (31) are sealed.

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