Denitration SCR reactor having regulable inlet flue gas temperature

Abstract

A denitration SCR reactor having a regulable inlet flue gas temperature, comprising an SCR device (100), and further comprising a distribution mechanism (200) arranged in a flue gas inlet pipe of the SCR device (100), wherein the distribution mechanism (200) comprises a gas distribution pipe (201); a shell (202) is connected to the gas distribution pipe (201); one end of the shell (202) is rotatably sleeved with a collar (203); a nozzle (204) is sleeved in the collar (203); a support (205) is connected to the end of the collar (203) located in the shell (202); a sleeve tube (207) is connected to the support (205) along the axial direction of the collar (203); fan blades (208) are fixedly sleeved on the sleeve tube (207); a long shaft (209) is inserted into the end of the sleeve tube (207) away from the collar (203); a reciprocating sliding block (210) is connected to the tail end of the long shaft (209); the reciprocating sliding block (210) is fixedly connected to the inner wall of the shell (202); and a connecting rod (211) is connected between the inner wall of the nozzle (204) and the long shaft (209). The SCR device (100) cyclically and reciprocatingly sprays high-temperature flue gas at different angles by means of the nozzle (204) of the distribution mechanism (200) in the flue gas inlet pipe, thereby effectively achieving full mixing of the high-temperature flue gas with low-temperature flue gas in the gas inlet pipe.

Description

Inlet flue gas temperature adjustable denitration SCR reactor TECHNICAL FIELD

[0001] The present application relates to the field of denitration equipment, in particular to an inlet flue gas temperature adjustable denitration SCR reactor. BACKGROUND

[0002] The working principle of the denitration SCR reactor of the thermal power plant is that NOx in the flue gas and NH3 occur reduction denitration reaction to generate nitrogen and water:

[0003] 4NO + 4NH3 + O2→ 4N2 + 6H2O

[0004] 2NO2 + 4NH3 + O2→ 3N2 + 6H2O

[0005] However, the above chemical reaction is only in a very narrow temperature range (about 980 DEG C) without catalyst, and the reaction temperature can be controlled at 280-420 DEG C with catalyst, which is equivalent to the flue gas temperature between the boiler economizer and the air preheater. Since the concentration of NOx in the flue gas is low, the temperature rise of the catalyst caused by the reaction can be ignored.

[0006] The current power market tends to be an economic market, and the deep peak shaving reconstruction of the thermal power plant becomes a normalization. The 2x660MW unit of our company is reconstructed, and the minimum load of the unit is reduced to 35%BMCR. The adjustable capacity interval is 230MW-660MW, which deviates from the original set value of 330MW-660MW of the unit. When the unit enters the deep adjustment working condition, the flue gas temperature at the outlet of the economizer will be lower than 280 DEG C, which cannot meet the denitration catalyst reaction temperature. Therefore, an inlet flue gas temperature adjustable denitration SCR reactor is proposed.

[0007] SUMMARY

[0008] In view of the above or the problem in the prior art that the SCR reactor inlet flue gas temperature is low when the thermal power plant unit operates at a low power, the present application is proposed.

[0009] Therefore, the purpose of the present application is to provide an inlet flue gas temperature adjustable denitration SCR reactor.

[0010] To solve the above technical problems, the application provides the following technical scheme: an inlet flue gas temperature adjustable denitration SCR reactor, comprising an SCR device, further comprising a distribution mechanism arranged in a flue gas inlet pipe of the SCR device, the distribution mechanism comprising a gas distribution pipe, and the gas distribution pipe is connected with a shell, one end of the shell is rotatably sleeved with a collar, the collar is sleeved with a nozzle inside, one end of the shell in the shell is connected with a support, the support is connected with a sleeve along the axial direction of the collar, the sleeve is fixedly sleeved with a fan blade, and one end of the sleeve away from the collar is inserted with a long shaft, the long shaft is connected with a reciprocating sliding block at the end, the reciprocating sliding block is fixedly connected with the inner wall of the shell, and the inner wall of the nozzle is connected with the long shaft.

[0011] As a preferred scheme of the application, the outer wall of the collar is provided with a bearing between the collar and the shell, and the inner wall of the collar is in a spherical shape, and the nozzle is connected with the collar in a spherical shape.

[0012] As a preferred scheme of the application, the collar and the sleeve are coaxial, the support extends along the spherical surface of the inner wall of the collar in a circular arc shape, the support is arranged in a ring shape about the collar, the support is connected with a short shaft, and the short shaft is threadedly fastened with the sleeve.

[0013] As a preferred scheme of the application, the outer wall of the sleeve is provided with a straight wall parallel to the axial direction, the straight wall is arranged in a ring shape about the sleeve, the middle part of the fan blade is arranged in an olive shape, the fan blade is coaxial with the sleeve, the fan blade is matched with the outer wall of the sleeve and is sleeved, and the screw is fastened along the radial direction of the sleeve at the position of the straight wall of the peripheral wall of the fan blade.

[0014] As a preferred scheme of the application, the blade of the fan blade and the axis of the sleeve form an angle of 45 degrees, and the pitch of the blade root of the fan blade is greater than the pitch of the blade tip.

[0015] As a preferred scheme of the application, one end of the gas distribution pipe is in a circular tube shape, the gas distribution pipe is provided with a straight flat tube and a bent flat tube, the cross section profiles of the straight flat tube and the bent flat tube are both in a D shape, the straight flat tube is connected with the side wall of the shell, the bent flat tube is connected with one end of the shell away from the collar, the straight flat tube is connected above the axis of the fan blade, and the bent flat tube is connected below the axis of the fan blade.

[0016] As a preferred scheme of the application, one end of the long shaft is in a hexagonal prism shape and is matched with the sleeve and is slidably inserted, the other end of the long shaft is provided with a reciprocating spiral groove in the peripheral wall, and the reciprocating spiral groove is matched with the reciprocating sliding block.

[0017] As a preferred solution of the application, the adjustable inlet flue gas temperature denitration SCR reactor, wherein: one end of the connecting rod is hinged to the inner wall of the nozzle, and the other end of the connecting rod is hinged to the outer wall of the long shaft through the adjacent supports and through the adjacent blades of the fan.

[0018] As a preferred solution of the application, the adjustable inlet flue gas temperature denitration SCR reactor, wherein: the side wall of the flue gas inlet pipe of the SCR device is provided with a flange interface, and the flange interface is sealingly connected with a cover plate, the cover plate is provided with a hole in the middle, and the gas distribution pipe is connected with the hole in the middle of the cover plate.

[0019] As a preferred solution of the application, the adjustable inlet flue gas temperature denitration SCR reactor, wherein: the inner diameter of the flange interface is adapted to the outer shape size of the distribution mechanism.

[0020] The adjustable inlet flue gas temperature denitration SCR reactor has the following advantages: the SCR device can effectively realize the full mixing of high-temperature flue gas and low-temperature flue gas in the inlet pipe by reciprocatingly spraying high-temperature flue gas at different angles through the nozzles of the distribution mechanism in the flue gas inlet pipe, has a smaller pipe flow area ratio and smaller fluid resistance, effectively improves the inlet flue gas temperature of the denitration SCR reactor, improves the denitration reaction efficiency, ensures that the environmental protection parameters meet the standards, reduces the amount of ammonia injection, saves bulk materials, effectively solves the problem that the power generation unit cannot guarantee the inlet flue gas temperature of the denitration SCR reactor under deep adjustment conditions, improves the deep adjustment capacity interval of the unit, and increases the economic benefits of the power generation enterprise. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Fig. 1 is a schematic diagram of the overall structure of the adjustable inlet flue gas temperature denitration SCR reactor.

[0023] Fig. 2 is a partial structure sectional view of the adjustable inlet flue gas temperature denitration SCR reactor.

[0024] Fig. 3 is a schematic diagram of the structure of the adjustable inlet flue gas temperature denitration SCR reactor after further cutting in Fig. 2.

[0025] Fig. 4 is a schematic diagram of the structure of the adjustable inlet flue gas temperature denitration SCR reactor after further cutting in Fig. 3.

[0026] Fig. 5 is a schematic diagram of the structure of the distribution mechanism of the adjustable inlet flue gas temperature denitration SCR reactor.

[0027] Figure 6 is a sectional view of the partial structure of the denitration SCR reactor with adjustable inlet flue gas temperature.

[0028] Figure 7 is a structure schematic diagram of the fan side view of the denitration SCR reactor with adjustable inlet flue gas temperature.

[0029] Figure 8 is a structure schematic diagram of the fan axial view of the denitration SCR reactor with adjustable inlet flue gas temperature.

[0030] Figure 9 is a schematic diagram of the flue gas bypass of the denitration SCR reactor with adjustable inlet flue gas temperature.

[0031] Figure 10 is a schematic diagram of the denitration SCR inlet flue gas temperature adjustment interface of the denitration SCR reactor with adjustable inlet flue gas temperature.

[0032] In the figure: 100, SCR device; 101, flange interface; 102, cover plate; 200, distribution mechanism; 201, gas distribution pipe; 202, shell; 203, collar; 204, nozzle; 205, bracket; 206, short shaft; 207, sleeve; 208, fan blade; 209, long shaft; 210, reciprocating slider; 211, connecting rod; 201a, straight flat tube; 201b, bent flat tube; 207a, straight wall. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] Embodiment 1, referring to Figures 1-8, is the first embodiment of the present application, which provides a denitration SCR reactor with adjustable inlet flue gas temperature, which can achieve the effect of rapid mixing of high-temperature flue gas and low-temperature flue gas in a compact structure, which comprises an SCR device 100, and further comprises a distribution mechanism 200 arranged in the flue gas inlet pipe of the SCR device 100, the flue gas inlet pipe of the SCR device 100 is provided with a flange interface 101, and the flange interface 101 is sealingly connected with a cover plate 102, the cover plate 102 is provided with a hole in the middle, and a gas distribution pipe 201 is connected with the hole in the middle of the cover plate 102, the inner diameter of the flange interface 101 is adapted to the outer dimensions of the distribution mechanism 200, the distribution mechanism 200 comprises a gas distribution pipe 201, and the gas distribution pipe 201 is connected with a shell 202, one end of the shell 202 is rotatably sleeved with a collar 203, the collar 203 is sleeved with a nozzle 204, one end of the collar 203 located in the shell 202 is connected with a bracket 205, the bracket 205 is connected with a sleeve 207 along the axial direction of the collar 203, the sleeve 207 is fixedly sleeved with a fan blade 208, one end of the sleeve 207 away from the collar 203 is inserted with a long shaft 209, the long shaft 209 is connected with a reciprocating slider 210 at the end, the reciprocating slider 210 is fixedly connected with the inner wall of the shell 202, and the connecting rod 211 is connected between the inner wall of the nozzle 204 and the long shaft 209.

[0035] Specifically, the outer wall of the sleeve ring 203 is provided with a bearing between the shell 202, and the inner wall of the sleeve ring 203 is spherical, the nozzle 204 is spherical with the sleeve ring 203, the sleeve ring 203 and the sleeve pipe 207 are coaxial, the support 205 extends along the spherical surface of the inner wall of the sleeve ring 203 in a circular arc shape, the supports 205 are annularly arranged about the sleeve ring 203, the short shafts 206 are connected between the supports 205, and the short shafts 206 are threadedly fastened with the sleeve pipe 207, the outer wall of the sleeve pipe 207 is provided with straight walls 207a parallel to the axial direction, the straight walls 207a are annularly arranged about the sleeve pipe 207, the middle part of the fan blade 208 is provided in an olive shape, and the fan blade 208 is coaxial with the sleeve pipe 207, the fan blade 208 is matched with the outer wall of the sleeve pipe 207 to slide and sleeve, the screw is fastened along the sleeve pipe 207 in the radial direction at the position of the straight wall 207a of the peripheral wall of the fan blade 208, one end of the long shaft 209 is hexagonal and matched with the sleeve pipe 207 to slide and insert, the other end of the long shaft 209 is provided with a reciprocating spiral groove 209a on the peripheral wall, the reciprocating spiral groove 209a is matched with the reciprocating sliding block 210, one end of the connecting rod 211 is hinged with the inner wall of the nozzle 204, and the other end of the connecting rod 211 is hinged with the outer wall of the long shaft 209 through the adjacent supports 205 and through the adjacent blades of the fan blade 208.

[0036] The working principle and advantages of the device are further illustrated in combination with the prior art: the flue gas from the main flue of the thermal power equipment needs to pass through the economizer before entering the inlet of the SCR device 100. The economizer uses high-temperature flue gas to heat the feed water to collect waste heat, so the temperature of the flue gas at the outlet of the economizer will decrease, and it will be difficult to meet the temperature requirement of 280-420℃ for the catalytic reduction reaction. Therefore, the high-temperature flue gas that has not been heat-exchanged is mixed with the low-temperature flue gas that has been heat-exchanged through a bypass to input the mixed flue gas into the SCR device 100, so that the temperature requirement of the catalytic reduction reaction can be met. Obviously, if the high-temperature flue gas and the low-temperature flue gas are not mixed uniformly, local flue gas may not be fully heat-exchanged and the temperature may be too low. Therefore, the mixing effect of the high-temperature flue gas and the low-temperature flue gas is crucial. Currently, a common device for uniformly dispersing one substance in another flowing fluid is a disperser. The gas disperser usually has a structure in which a plurality of thin sub-pipes are uniformly welded to the peripheral wall of a thick main pipe, and holes are uniformly opened on the side walls of the main pipe and the sub-pipes. The disperser is placed in the flowing gas that needs to be mixed, and the gas that needs to be mixed can be dispersed in the flowing gas from different positions of the small holes. The mixing effect of the gas disperser depends on the number and sufficient position extension of the sub-pipes, as well as the number of holes on the sub-pipes. Obviously, using the conventional gas disperser to achieve a better mixing effect at the inlet of the SCR device 100 will seriously reduce the internal flow area of the flue gas inlet pipe of the SCR device 100, and will cause a relatively significant flue gas flow resistance. Moreover, the drawbacks of the gas disperser cannot be solved by enlarging the flue gas inlet pipe of the SCR device 100, because the internal diameter of the inlet pipe is enlarged, and in order to prevent the flue gas from bypassing the gas disperser, more sub-pipes and holes need to be added to maintain the mixing effect.

[0037] The present application provides an SCR device 100 for mixing inlet gas by injection, mainly providing a dispersing mechanism 200. The dispersing mechanism 200 realizes the sufficient mixing of high-temperature flue gas and low-temperature flue gas in the inlet pipe by cyclically and reciprocally injecting the high-temperature flue gas at different angles in the flue gas inlet pipe of the SCR device 100. More specifically, the angle between the injection direction of the nozzle 204 and the axis direction of the sleeve 207 changes synchronously during the continuous rotation of the nozzle 204 around the axis of the sleeve 203, and the change range of the angle is close to (less than) ninety degrees. Therefore, the high-temperature flue gas is quickly and comprehensively injected and dispersed in the flue gas pipe. Moreover, the device itself has a compact structure, a small projection area (in the axial direction of the flue gas pipe), and a small fluid resistance.

[0038] The specific workflow is as follows: high-temperature flue gas drives the fan blade 208 to rotate through the gas distribution pipe 201. The fan blade 208 drives the sleeve 207, bracket 205, collar 203 and nozzle 204 to rotate. Since the long shaft 209 is connected to the sleeve 207 through a hexagonal prism, the fan blade 208 also drives the long shaft 209 to rotate. The long shaft 209 can only move along the axial direction of the sleeve 207. The reciprocating spiral groove 209a at the other end of the long shaft 209 rotates in the reciprocating slider 210 with the long shaft 209. Since the reciprocating slider 210 is fixed relative to the housing 202, the long shaft 209 reciprocates along the axial direction of the sleeve 207. The connecting rod 211 rotates synchronously with the long shaft 209, and the connecting rod 211 repeatedly pushes and pulls the nozzle 204 with the reciprocating motion of the long shaft 209, so that the nozzle 204 rotates and swings at the same time, so that the spray range of the nozzle 204 fully covers the inside of the flue gas duct.

[0039] In summary, the SCR device 100 uses the nozzles 204 of its flue gas inlet pipe distribution mechanism 200 to repeatedly spray high-temperature flue gas at different angles, effectively achieving full mixing of high-temperature flue gas and low-temperature flue gas in the inlet pipe, while having a small pipe flow area ratio and low fluid resistance.

[0040] Example 2, referring to Figures 3, 4, 7, and 8, is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a drive structure for a denitrification SCR reactor with adjustable inlet flue gas temperature. This achieves the effect of fully utilizing the airflow to obtain the swirl jet driving force of the nozzle 204 within the limited space inside the shell 202. It includes a fan blade 208 with its blades forming a 45-degree angle with the axis of the sleeve 207, and the pitch at the root of the fan blade 208 being greater than that at the blade tip. The pitch is such that one end of the air distribution pipe 201 is round, and the air distribution pipe 201 is provided with a straight flat pipe 201a and a bent flat pipe 201b. The cross-sectional profiles of the straight flat pipe 201a and the bent flat pipe 201b are both D-shaped. The straight flat pipe 201a is connected to the side wall of the housing 202, and the bent flat pipe 201b is connected to the end of the housing 202 away from the collar 203. The straight flat pipe 201a is connected above the axis of the fan blade 208, and the bent flat pipe 201b is connected below the axis of the fan blade 208.

[0041] The device adopts high-temperature flue gas to drive the fan blade 208 to rotate and provide power for the rotation of the nozzle 204, but unlike the general airflow-driven fan blade 208, the fan blade 208 of the device is approximately shaped like a shuttlecock, and the blade is inclined to the axis direction of the fan blade 208, so that the blade of the fan blade 208 obtains a longer length and a larger force area in the limited space of the shell 202. Referring to FIGS. 7 and 8, the blade of the fan blade 208 has a large projection area in the axial and lateral directions. Under the premise of not reducing the diameter of the gas distribution pipe 201 and ensuring the flow of high-temperature flue gas, the gas distribution pipe 201 is relatively compact compared to the shell 202 and the fan blade 208, which is large. Therefore, the device drives the fan blade 208 from two directions, one is to drive the fan blade 208 from the side of the fan blade 208, to directly align the upper part of the fan blade 208 above the axis with the upper half of the gas distribution pipe 201, and to close the area of the fan blade 208 below the axis on the side of the fan blade 208, so as to improve the driving efficiency of the airflow from the side of the fan blade 208. In addition, the blade tip pitch of the fan blade 208 is relatively small compared to the root, which increases the projection area of the blade tip far from the axis relative to the straight pipe 201a, further improving the driving efficiency. The other is to introduce the lower half of the gas distribution pipe 201 from the axial direction of the fan blade 208, which can drive the whole fan blade 208 and fully utilize the remaining flow while balancing the force of the fan blade 208.

[0042] The remaining structure is the same as that of Example 1.

[0043] In summary, the distribution mechanism 200 effectively obtains the driving force of the nozzle 204 rotation in the limited space of the shell 202 by using high-temperature flue gas flow.

[0044] Example 3, referring to FIGS. 9 and 10, is the third embodiment of the present application. Unlike the previous embodiment, this embodiment provides an inlet smoke temperature adjustable denitration SCR reactor smoke inlet temperature adjusting process. The specific scheme is to increase the flue gas bypass to bypass the economizer and connect with the SCR device 100 smoke inlet pipeline, add a full-stroke electric shut-off door and a full-stroke electric regulating door on the flue gas bypass pipeline, control the bypass flue gas flow by changing the opening degree of the regulating door to control the inlet flow of the denitration SCR device 100, and increase a half-stroke flue adjusting door on the main road of the economizer outlet flue gas to realize the function of the shunt flue gas. When the full-open flue gas bypass regulating door still cannot increase the inlet temperature of the denitration SCR device 100, the flue gas main road regulating door is appropriately closed to increase the bypass flue gas flow by changing the flue gas flow of the flue gas main road.

[0045] Corresponding connection relationship: when the unit enters the deep regulation condition, the denitration SCR device 100 inlet flue gas temperature is lower than the set value, the damper is automatically opened, the opening is greater than 5%, the flue gas bypass electric closing door interlock is automatically fully opened, when the flue gas bypass damper is fully opened, the denitration SCR device 100 inlet flue gas temperature is still lower than the set value, the flue gas main road damper starts to slowly close, when the unit load starts to rise, the interlocking action is opposite to the above.

[0046] The rest of the structure is the same as that of example 2.

[0047] In summary, the process can effectively improve the denitration SCR device 100 inlet flue gas temperature, improve the denitration reaction efficiency, ensure that the environmental protection parameters meet the standards, reduce the ammonia injection amount, save the bulk consumables, effectively solve the problem that the thermal power unit cannot guarantee the denitration SCR device 100 inlet flue gas temperature under the deep regulation condition, improve the unit deep regulation capacity interval, increase the economic benefit of the thermal power enterprise, the transformation cost is low, the feasibility is strong and the system operation is simple.

[0048] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A denitration SCR reactor with adjustable inlet flue gas temperature, comprising an SCR device (100), characterized in that: Also include the setting in the SCR device (100) flue gas inlet pipe within the dispersion mechanism (200), the dispersion mechanism (200) includes the gas distribution pipe (201), and the gas distribution pipe (201) is connected with the shell (202), one end of the shell (202) is rotatably sleeved with the collar (203), the collar (203) is sleeved with the nozzle (204) inside, and the collar (203) is located in the shell (202) one end is connected with the support (205), and the support (205) is connected with the sleeve (207) along the axial direction of the collar (203), the sleeve (207) is fixedly sleeved with the fan blade (208), and the sleeve (207) is inserted with the long shaft (209) away from the collar (203) one end, the long shaft (209) end is connected with the reciprocating slider (210), the reciprocating slider (210) is fixedly connected with the inner wall of the shell (202), the inner wall of the nozzle (204) and the long shaft (209) are connected with the connecting rod (211).

2. The inlet smoke temperature adjustable denitration SCR reactor according to claim 1, characterized in that: The outer wall of the collar (203) and the shell (202) are provided with a bearing, and the inner wall of the collar (203) is spherical, the nozzle (204) and the collar (203) are spherical.

3. The inlet smoke temperature adjustable denitration SCR reactor according to claim 2, characterized in that: The collar (203) and the sleeve (207) are coaxial, the support (205) extends along the spherical surface of the inner wall of the collar (203) and is arc-shaped, and the support (205) is annularly arranged about the collar (203), the short shaft (206) is connected between the supports (205), and the short shaft (206) is threadedly fastened with the sleeve (207).

4. The inlet smoke temperature adjustable denitration SCR reactor according to claim 3, characterized in that: The outer wall of the sleeve (207) is provided with a straight wall (207a) parallel to the axial direction, the straight wall (207a) is annularly arranged about the sleeve (207), the middle part of the fan blade (208) is olive-shaped, and the fan blade (208) is coaxial with the sleeve (207), the fan blade (208) is slidingly sleeved with the outer wall of the sleeve (207), and the circumferential wall of the fan blade (208) is provided with a screw at the straight wall (207a) along the radial direction of the sleeve (207).

5. The inlet smoke temperature adjustable denitration SCR reactor according to claim 4, characterized in that: The blade of the fan blade (208) forms an angle of 45 degrees with the axis of the sleeve (207), and the pitch of the blade root of the fan blade (208) is greater than the pitch of the blade tip.

6. The inlet smoke temperature adjustable denitration SCR reactor according to claim 5, characterized in that: One end of the gas distribution pipe (201) is circular, the gas distribution pipe (201) is provided with a straight flat tube (201a) and a bent flat tube (201b), the cross-sectional profile of the straight flat tube (201a) and the bent flat tube (201b) is D-shaped, the straight flat tube (201a) is connected with the side wall of the shell (202), the bent flat tube (201b) is connected with the end of the shell (202) away from the collar (203), and the straight flat tube (201a) is connected above the axis of the fan blade (208), and the bent flat tube (201b) is connected below the axis of the fan blade (208).

7. The inlet smoke temperature adjustable denitration SCR reactor according to claim 6, characterized in that: One end of the long shaft (209) is in the shape of a hexagonal prism and is slidably inserted into the sleeve (207), and the other end of the long shaft (209) is provided with a reciprocating spiral groove (209a) in the peripheral wall, which is connected with a reciprocating sliding block (210).

8. The inlet smoke temperature adjustable denitration SCR reactor according to claim 7, characterized in that: One end of the connecting rod (211) is hingedly connected to the inner wall of the nozzle (204), and the other end of the connecting rod (211) is hingedly connected to the outer wall of the long shaft (209) through the adjacent supports (205) and the adjacent blades of the fan blades (208).

9. The inlet smoke temperature adjustable denitration SCR reactor according to claim 8, characterized in that: The sidewall of the flue gas inlet pipe of the SCR device (100) is provided with a flange interface (101), and the flange interface (101) is sealingly connected with a cover plate (102), the cover plate (102) is provided with a hole in the middle, and the gas distribution pipe (201) is connected to the hole in the middle of the cover plate (102).

10. The inlet smoke temperature adjustable denitration SCR reactor according to claim 9, characterized in that: The inner diameter of the flange interface (101) is adapted to the outer shape of the distribution mechanism (200).

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