A PDH waste heat boiler inlet flue gas uniform flow grid

Abstract

The application discloses a PDH waste heat boiler inlet flue gas uniform flow grid, which comprises a group of ammonia conveying assemblies, a plurality of groups of sub-flow assemblies, a plurality of groups of smoke suction assemblies and a group of turbulence assemblies, wherein the ammonia conveying assembly comprises a main ammonia conveying pipe and a plurality of branch pipes, the ammonia conveying assembly is used for conveying mixed gas formed by ammonia gas and compressed air, an electromagnetic control valve is arranged in each branch pipe, and the electromagnetic control valve is used for controlling the on-off of fluid in the branch pipe. Ammonia gas output by the main ammonia conveying pipe flows into each sub-flow assembly in sequence, and when ammonia gas flows into a certain sub-flow assembly, the smoke suction assembly near the sub-flow assembly can actively suck boiler flue gas, so that the boiler flue gas and the ammonia gas are fully mixed. In this way, ammonia gas flows into only one group of sub-flow assemblies each time, and flue gas is actively sucked and mixed, so that the problem of uneven mixing caused by directly laying a plurality of sub-flow pipes to cover the flue gas can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas denitration, and particularly relates to a PDH waste heat boiler inlet flue gas uniform flow grid. BACKGROUND

[0002] The flue gas discharged by a boiler is rich in nitrogen oxides such as NO and NO2 with high concentration. In order to effectively respond to this environmental challenge, the SCR (selective catalytic reduction) technology has been widely used and recognized in the field of boiler flue gas treatment due to its excellent denitration performance, stable operation performance and smooth operation characteristics. As one of the core components of the SCR technology, the ammonia injection grid plays an important role in this process.

[0003] In order to make the ammonia injection grid and the boiler flue gas mix more fully, a boiler flue gas denitration turbulence type ammonia injection grid is disclosed in Chinese Patent Publication No. "CN210434278U", which mainly improves the mixing effect by setting multiple shunt pipes and nozzles and setting a turbulence ring. However, in this denitration scheme, although a large number of shunt pipes are designed to fully cover the large area of flue gas generated by the boiler, there is a challenge: uneven distribution of ammonia gas. Specifically, the shunt pipes close to the ammonia injection main pipe can smoothly receive sufficient ammonia gas supply, while the shunt pipes far away from the ammonia injection main pipe have significantly reduced ammonia gas flow. This uneven distribution directly leads to the non-uniformity of flue gas treatment, so that the flue gas area far away from the main pipe cannot obtain sufficient ammonia treatment, thereby affecting the overall flue gas purification effect, especially the flue gas treatment effect of the remote area is greatly discounted. In view of this, the present application proposes a PDH waste heat boiler inlet flue gas uniform flow grid. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art and to provide a PDH waste heat boiler inlet flue gas uniform flow grid.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A PDH waste heat boiler inlet flue gas uniform flow grid, comprising a group of ammonia conveying assemblies, a plurality of shunt assemblies, a plurality of smoke absorbing assemblies and a group of turbulence assemblies, wherein the ammonia conveying assembly comprises a main ammonia conveying pipe and a plurality of branch pipes, and the ammonia conveying assembly is used for conveying mixed gas formed by ammonia gas and compressed air;

[0007] Each shunt assembly comprises an arc-shaped pipe and two air guide pipes, and the shunt assembly is used for shunting and conveying ammonia gas;

[0008] The smoke absorbing assembly comprises a negative pressure box, a power box, a power fan and a centrifugal fan, wherein the power fan is installed in the power box, and the centrifugal fan is installed in the negative pressure box to generate negative pressure and actively absorb boiler flue gas.

[0009] The turbulence assembly comprises a turbulence plate, a support rod and a rolling ball, and is used to generate turbulence when the ammonia gas mixes with the flue gas, so as to make the ammonia gas mix with the flue gas more sufficiently.

[0010] Preferably, the power fan is connected with the centrifugal fan through a connecting mechanism, the connecting mechanism is used to drive the centrifugal fan to rotate, and the air duct is communicated with the power box through the air blowing pipe.

[0011] Preferably, the connecting mechanism comprises a connecting shaft and a plurality of connecting rods, the power fan is composed of an annular support and a plurality of fan blades, one end of the connecting rod is fixedly connected to the inner wall of the annular support, the other end of the connecting rod is fixedly connected to the side wall of the connecting shaft, and the connecting shaft is fixedly connected with the centrifugal fan.

[0012] Preferably, the smoking assembly further comprises an ammonia discharge pipe, an exhaust pipe, a mixing pipe, a driving rod, a connecting rod and a cleaning scraper, the ammonia discharge pipe is communicated with the mixing pipe and the power box, the exhaust pipe is communicated with the mixing pipe and the negative pressure box, a plurality of filter holes are formed in the side wall of the negative pressure box, the cleaning scraper is slidingly arranged on the side wall of the negative pressure box, one end of the connecting rod is fixedly connected with the cleaning scraper, the other end of the connecting rod is fixedly connected to the side wall of the driving rod, and the driving rod is driven to move by the driving mechanism.

[0013] Preferably, the driving mechanism comprises a driving box, an incomplete gear, a rack and a return spring, the driving box is fixedly installed on the side wall of the negative pressure box, the incomplete gear is rotatably arranged in the driving box, the rack is matched with the incomplete gear, the rack is slidingly arranged in the driving box, one end of the return spring is fixedly connected to the lower side of the rack, the other end of the return spring is fixedly connected to the bottom of the driving box, and the connecting shaft is fixedly connected with the incomplete gear.

[0014] Preferably, a plurality of turbulence rings are slidingly arranged in the mixing pipe, a plurality of turbulence plates are fixedly connected to the inner wall of the turbulence ring, the plurality of turbulence rings are fixedly connected together through a vertical rod, and one end of the driving rod away from the rack is fixedly connected with an adjacent turbulence ring.

[0015] Preferably, a plurality of turbulence grooves are formed in the lower end surface of the turbulence plate, and the plurality of turbulence grooves are distributed at equal intervals along the circumference of the turbulence plate.

[0016] Preferably, a hemispherical cover is fixedly connected to the lower end of the main ammonia conveying pipe, the rolling ball is rollingly arranged in the hemispherical cover, the upper end of the support rod is fixedly connected with the rolling ball, and the lower end of the support rod is fixedly connected to the upper end of the turbulence plate.

[0017] Preferably, a vibration spring is fixedly connected to the upper end of each mixing pipe, and the upper end of the vibration spring is fixedly connected to the lower end of the turbulence plate.

[0018] Preferably, an electromagnetic control valve is installed in each branch pipe for controlling the on-off of fluid in the branch pipe, and two air guide pipes are communicated at two ends of the arc-shaped pipe; the smoking assembly is arranged between the two air guide pipes of the adjacent flow distribution assembly, and the arc-shaped pipe is communicated with the adjacent branch pipe.

[0019] The present application has the following advantages:

[0020] 1. By arranging the flow distribution assembly and the smoking assembly, the electromagnetic control valves in the branch pipes are opened and closed in sequence, so that the ammonia gas output by the main ammonia pipe flows into the flow distribution assemblies in sequence, and when the ammonia gas flows into a flow distribution assembly, the smoking assembly near the flow distribution assembly can actively suck in the boiler flue gas and mix the boiler flue gas with the ammonia gas, so that the ammonia gas flows into a group of flow distribution assemblies and the smoking assembly actively sucks in the flue gas for mixing each time, which can avoid the problem of uneven mixing caused by directly laying multiple flow distribution pipes to cover the flue gas.

[0021] 2. By arranging the power fan, the connecting mechanism and the centrifugal fan, the power of the ammonia gas and the compressed air during discharge can be used to drive the power fan to rotate, and then the connecting mechanism drives the centrifugal fan to rotate to generate negative pressure to actively absorb the boiler flue gas, on the one hand, no additional electrically driven equipment needs to be erected, energy consumption is saved, and on the other hand, the ammonia gas is delivered to a certain place, and the flue gas is also absorbed to the same position, so that the flue gas can be thoroughly and sufficiently treated.

[0022] 3. By arranging the filter holes on the surface of the negative pressure box, solid particles in the flue gas can be effectively filtered out, and the purification effect of the flue gas is improved, and by arranging the driving mechanism, the driving rod and the cleaning scraper, the driving mechanism can continuously drive the driving rod and the cleaning scraper to clean the surface of the negative pressure box, so that the solid particles adsorbed on the surface of the negative pressure box can be quickly cleaned, and the filter holes are prevented from being blocked due to the aggregation of the solid particles.

[0023] 4. By arranging the mixing pipe, the turbulence ring and the turbulence plate, when the flue gas and the ammonia gas flow into the mixing pipe for mixing, the driving mechanism can also drive the turbulence plate to move up and down, so that the mixed gas in the mixing pipe can be continuously stirred, the ammonia gas and the flue gas can be further mixed, and the mixed gas can be more fully reacted.

[0024] 5. By arranging the mixing pipe, the vibration spring and the turbulence plate, since the electromagnetic control valves in the flow distribution assemblies are opened and closed in sequence, the ammonia gas flows into the flow distribution assemblies in sequence, so the mixed gas in each mixing pipe is also discharged in sequence, so that the mixed gas discharged from each mixing pipe can impact the turbulence plate in sequence, the turbulence plate can swing in various directions, the mixed gas passing below can be turbulent, the residence time of the mixed gas is increased, the reaction is more complete, and the mixed gas can be effectively stirred, so that the ammonia gas and the flue gas can be uniformly mixed. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall external structure of the inlet flue gas equalization grid of a PDH waste heat boiler proposed in this invention;

[0026] Figure 2 This is a schematic diagram of the connection structure between a group of flow components, a smoke extraction component, and a turbulence component in this invention;

[0027] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0028] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B in the diagram;

[0029] Figure 5 This is a schematic diagram of the connection structure of components such as the inside of the negative pressure box, the power fan, the centrifugal fan, the connecting mechanism, the drive rod, the connecting rod, the cleaning scraper, and the turbulence ring in this invention.

[0030] Figure 6 This is a schematic diagram of the connection structure of the negative pressure box interior, the power fan, and part of the drive mechanism in this invention;

[0031] Figure 7 This is a schematic diagram of the connection structure of components such as the mixing pipe, the turbulence ring, the turbulence plate, the drive rod, the connecting rod, the cleaning scraper, the rack, and the return spring in this invention.

[0032] Figure 8 This is a schematic diagram of the bottom structure of the turbulence plate in this invention;

[0033] Figure 9 This is a schematic diagram of the connection structure of the main ammonia delivery pipe, turbulence assembly, vibrating spring and mixing pipe in this invention.

[0034] In the diagram: 1 Main ammonia supply pipe, 2 Branch pipe, 3 Arc-shaped pipe, 4 Air guide pipe, 5 Hemispherical hood, 6 Roller ball, 7 Support rod, 8 Smoke extraction assembly, 801 Power box, 802 Negative pressure box, 803 Drive box, 804 Mixing pipe, 805 Exhaust pipe, 806 Ammonia discharge pipe, 807 Drive rod, 808 Blower pipe, 809 Connecting rod, 810 Scraper, 811 Filter hole, 9 Turbulence plate, 10 Vibrating spring, 11 Turbulence groove, 12 Power fan, 13 Connecting shaft, 14 Connecting rod, 15 Centrifugal fan, 16 Spoiler, 17 Spoiler ring, 18 Vertical rod, 19 Incomplete gear, 20 Rack, 21 Return spring. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Embodiment one:

[0036] Referring to Figure 1 A PDH waste heat boiler inlet flue gas uniform flow grid, comprising a group of ammonia conveying assemblies, a plurality of component flow assemblies, a plurality of smoke suction assemblies 8 and a group of turbulence assemblies, wherein the ammonia conveying assembly comprises a main ammonia conveying pipe 1 and a plurality of branch pipes 2, the ammonia conveying assembly is used for conveying mixed gas formed by ammonia and compressed air, an electromagnetic control valve is installed in each branch pipe 2, and the electromagnetic control valve is used for controlling the on-off of fluid in the branch pipe 2.

[0037] Each component flow assembly comprises an arc-shaped pipe 3 and two air guide pipes 4, the component flow assembly is used for conveying ammonia in a shunt manner, and the two air guide pipes 4 are communicated at two ends of the arc-shaped pipe 3; the smoke suction assembly 8 is arranged between the two air guide pipes 4 of adjacent component flow assemblies, and the arc-shaped pipe 3 is communicated with the adjacent branch pipe 2.

[0038] The smoke suction assembly 8 comprises a negative pressure box 802, a power box 801, a power fan 12 and a centrifugal fan 15, wherein the power fan 12 is installed in the power box 801, the centrifugal fan 15 is installed in the negative pressure box 802 and is used for generating negative pressure and actively absorbing boiler flue gas, the power fan 12 is connected with the centrifugal fan 15 through a connecting mechanism, the connecting mechanism is used for driving the centrifugal fan 15 to rotate by the power fan 12, and the air guide pipe 4 is communicated with the power box 801 through an air blowing pipe 808.

[0039] In the embodiment, the mixed gas of ammonia and compressed air is directly input into the main ammonia conveying pipe 1 of the ammonia conveying assembly, at this time, the electromagnetic control valves in the branch pipes 2 are opened and closed in turn, specifically, when the electromagnetic control valve in a certain branch pipe 2 is opened, the electromagnetic control valves in the remaining branch pipes 2 are all closed, that is, the branch pipes 2 convey the mixed gas of ammonia and compressed air in turn.

[0040] When the mixed gas of ammonia and compressed air is input into a certain branch pipe 2, the mixed gas can be conveyed into the corresponding arc-shaped pipe 3 from the branch pipe 2, and is output into the power box 801 through the two air guide pipes 4 and the two air blowing pipes 808, finally, the mixed gas can drive the power fan 12 to rotate, and drive the centrifugal fan 15 to rotate through the connecting mechanism, after the centrifugal fan 15 rotates, negative pressure can be generated, and the passing boiler flue gas can be actively sucked into the negative pressure box 802, in this way, the ammonia flows into a group of component flow assemblies each time, and the flue gas is actively sucked for mixing, which can avoid the problem of uneven mixing caused by directly laying a plurality of shunt pipes to cover the flue gas. Embodiment two:

[0041] Compared with embodiment one, the embodiment further has that the connecting mechanism comprises a connecting shaft 13 and a plurality of link rods 14, the power fan 12 is composed of a ring-shaped support and a plurality of fan blades, one end of the link rod 14 is fixedly connected to the inner wall of the ring-shaped support, the other end of the link rod 14 is fixedly connected to the side wall of the connecting shaft 13, and the connecting shaft 13 is fixedly connected with the centrifugal fan 15.

[0042] The smoking assembly 8 further comprises an ammonia discharge pipe 806, an exhaust pipe 805, a mixing pipe 804, a driving rod 807, a connecting rod 809 and a cleaning scraper 810. The ammonia discharge pipe 806 is connected between the power box 801 and the mixing pipe 804, the exhaust pipe 805 is connected between the negative pressure box 802 and the mixing pipe 804, the side wall of the negative pressure box 802 is provided with a plurality of filter holes 811, the cleaning scraper 810 is slidingly arranged on the side wall of the negative pressure box 802, one end of the connecting rod 809 is fixedly connected with the cleaning scraper 810, the other end of the connecting rod 809 is fixedly connected to the side wall of the driving rod 807, and the driving rod 807 is driven to move by the driving mechanism.

[0043] The driving mechanism comprises a driving box 803, an incomplete gear 19, a rack 20 and a return spring 21. The driving box 803 is fixedly installed on the side wall of the negative pressure box 802, the incomplete gear 19 is rotatably arranged in the driving box 803, the rack 20 is matched with the incomplete gear 19, the rack 20 is slidingly arranged in the driving box 803, one end of the return spring 21 is fixedly connected to the lower side of the rack 20, the other end of the return spring 21 is fixedly connected to the bottom of the driving box 803, and the connecting shaft 13 is fixedly connected with the incomplete gear 19. It should be noted that, referring to Figure 6 The incomplete gear 19 is specifically a gear with only part of teeth. When it rotates, it can intermittently drive the rack 20 to move.

[0044] Referring to Figure 2 , Figure 5 and Figure 6 When the mixed gas of ammonia and compressed air is input from the air blowing pipes 808 on both sides of the power box 801, it will act on the fan blades of the power fan 12 and drive the power fan 12 to rotate. The power fan 12 can drive the centrifugal fan 15 to rotate through the connecting shaft 13 and the connecting rod 14. At the same time, the solid particles in the boiler flue gas can be filtered out by the filter holes 811 on the surface of the negative pressure box 802, so that the boiler flue gas can be effectively purified.

[0045] In addition, referring to Figure 6 When the connecting shaft 13 rotates, it will also drive the incomplete gear 19 to rotate. When the incomplete gear 19 rotates, the toothed part will periodically pass through the rack 20. When the toothed part of the incomplete gear 19 passes through the rack 20, it can engage with the rack 20 and drive the rack 20 to move a distance. Then the incomplete gear 19 is disengaged from the rack 20, and the return spring 21 immediately pulls the rack 20 back to reset. Thus, during the continuous rotation of the incomplete gear 19, the rack 20 can move up and down reciprocatingly. The rack 20 can drive the cleaning scraper 810 to move up and down synchronously through the driving rod 807 and the connecting rod 809. Referring to Figure 4When the scraper 810 is sliding on the surface of the negative pressure box 802 and moving up and down, the solid particles trapped on the surface of the negative pressure box 802 can be effectively removed and cleaned, avoiding the blockage of the filter hole 811 caused by the aggregation of the solid particles.

[0046] Further, the mixed gas of the ammonia gas and the compressed air can be discharged into the mixing pipe 804 through the ammonia discharge pipe 806 after driving the power fan 12 to rotate, referring to Figure 4 The boiler flue gas sucked by the negative pressure box 802 can also enter the mixing pipe 804 through the exhaust pipe 805, and finally the ammonia gas and the flue gas can be mixed and reacted to perform the denitration treatment on the flue gas.

[0047] Implementation three:

[0048] Compared with the first and second embodiments, the mixing pipe 804 in the present embodiment is slidingly provided with a plurality of turbulence rings 17, and the inner wall of the turbulence ring 17 is fixedly connected with a plurality of turbulence plates 16. The plurality of turbulence rings 17 are fixedly connected together through a vertical rod 18, and the end of the driving rod 807 away from the rack 20 is fixedly connected with an adjacent turbulence ring 17.

[0049] In the present embodiment, according to the above-mentioned content in the second embodiment, the rack 20 in the driving mechanism can drive the driving rod 807 to move up and down reciprocally, so that the turbulence ring 17 fixedly connected with the driving rod 807 also moves up and down reciprocally, and drives the remaining turbulence rings 17 to move together through the vertical rod 18, referring to Figure 5 and 7 When the turbulence ring 17 moves up and down reciprocally in the mixing pipe 804, the turbulence ring 17 and the turbulence plate 16 can stir the mixed gas of the ammonia gas and the flue gas passing through the mixing pipe 804, so that the mixing of the two is more sufficient and uniform, and the denitration treatment reaction of the flue gas is more sufficient and complete, thereby improving the effective degree of the treatment of the flue gas. Fourth embodiment:

[0050] Compared with the first to third embodiments, the turbulence assembly in the present embodiment includes a turbulence plate 9, a support rod 7 and a rolling ball 6. The turbulence assembly is used to generate turbulence when the ammonia gas and the flue gas are mixed, so that the mixing of the ammonia gas and the flue gas is more sufficient. The lower end surface of the turbulence plate 9 is provided with a plurality of turbulence grooves 11, and the plurality of turbulence grooves 11 are distributed equidistantly along the circumference of the turbulence plate 9. By providing the turbulence grooves 11, when the mixed gas of the ammonia gas and the flue gas which is not completely reacted is discharged from the mixing pipe 804, turbulence occurs when the mixed gas blows to the turbulence grooves 11 of the turbulence plate 9, the residence time of the mixed gas in the device is increased, so that the reaction is more complete and thorough.

[0051] The lower end of the main ammonia conveying pipe 1 is fixedly connected with a hemispherical cover 5, a rolling ball 6 is arranged in the hemispherical cover 5, the upper end of a supporting rod 7 is fixedly connected with the rolling ball 6, and the lower end of the supporting rod 7 is fixedly connected with the upper end of a turbulence plate 9. The upper end of each mixing pipe 804 is fixedly connected with a vibration spring 10, and the upper end of the vibration spring 10 is fixedly connected with the lower end of the turbulence plate 9. Specifically, the rolling ball 6 rolling in the hemispherical cover 5 is arranged, and the rolling ball 6 is connected with the turbulence plate 9 through the supporting rod 7, so that the turbulence plate 9 can be conveniently swung in all directions, and the rolling ball 6 can roll in the corresponding direction.

[0052] In addition, the vibration spring 10 is arranged, on one hand, the turbulence plate 9 is connected with the upper end of each mixing pipe 804, and on the other hand, the turbulence plate 9 can be pulled back to the original position after swinging.

[0053] It can be found from the contents of the first to third embodiments that: since the mixed gas of ammonia and compressed air is input into each shunt assembly through the electromagnetic control valves in each branch pipe 2 in turn, and the flue gas is also absorbed to the same position where the ammonia is delivered, finally, the mixed gas of ammonia and ammonia is also discharged from each mixing pipe 804 in turn, referring to Figure 1 and Figure 9 When the mixed gas of ammonia and flue gas is discharged from each mixing pipe 804, the mixed gas flow will impact the corresponding side of the turbulence plate 9, so that the turbulence plate 9 is turned by a certain angle, and when the mixed gas is sprayed out from the mixing pipe 804 in turn, the turbulence plate 9 can be swung in all directions, so that the mixed gas passing below can be turbulent, the residence time of the mixed gas is increased, the reaction is more complete, and the turbulence plate 9 which is continuously swung can effectively stir the mixed gas, so that the mixing of ammonia and flue gas is more uniform.

[0054] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A PDH waste heat boiler inlet flue gas equalization grid, comprising a set of ammonia conveying components, a multi-component flow assembly, a multi-set smoke extraction assembly (8), and a set of turbulence assembly, characterized in that, The ammonia delivery assembly includes a main ammonia delivery pipe (1) and multiple branch pipes (2), and the ammonia delivery assembly is used to deliver a mixture of ammonia and compressed air. Each of the diversion components includes an arc-shaped tube (3) and two gas guide tubes (4), the diversion components being used to divert and transport ammonia gas; The smoke extraction assembly (8) includes a negative pressure box (802), a power box (801), a power fan (12) and a centrifugal fan (15), wherein the power fan (12) is installed in the power box (801) and the centrifugal fan (15) is installed in the negative pressure box (802) to generate negative pressure and actively absorb boiler flue gas; The turbulence assembly includes a turbulence plate (9), a support rod (7), and a ball (6). The turbulence assembly is used to generate turbulence when ammonia and flue gas are mixed, so that ammonia and flue gas are mixed more thoroughly. The power fan (12) is connected to the centrifugal fan (15) through a connecting mechanism. The connecting mechanism is used for the power fan (12) to drive the centrifugal fan (15) to rotate. The air guide pipe (4) is connected to the power box (801) through the air blower pipe (808). The smoking assembly (8) also includes an ammonia discharge pipe (806), an exhaust pipe (805), a mixing pipe (804), a drive rod (807), a connecting rod (809), and a cleaning scraper (810). The ammonia discharge pipe (806) connects the power box (801) and the mixing pipe (804). The exhaust pipe (805) connects the negative pressure box (802) and the mixing pipe (804). The side wall of the negative pressure box (802) is provided with multiple filter holes (811). The cleaning scraper (810) is slidably disposed on the side wall of the negative pressure box (802). One end of the connecting rod (809) is fixedly connected to the cleaning scraper (810), and the other end of the connecting rod (809) is fixedly connected to the side wall of the drive rod (807). The drive rod (807) is driven to move by the drive mechanism. Each of the branch pipes (2) is equipped with an electromagnetic control valve, which is used to control the flow of fluid in the branch pipe (2). The two air guide pipes (4) are connected to the two ends of the arc pipe (3). The smoking assembly (8) is set between the two air guide pipes (4) of the adjacent diversion assembly. The arc pipe (3) is connected to the adjacent branch pipe (2).

2. The PDH waste heat boiler inlet flue gas equalization grid according to claim 1, characterized in that, The connecting mechanism includes a connecting shaft (13) and multiple connecting rods (14). The power fan (12) is composed of an annular bracket and multiple fan blades. One end of the connecting rod (14) is fixedly connected to the inner wall of the annular bracket, and the other end of the connecting rod (14) is fixedly connected to the side wall of the connecting shaft (13). The connecting shaft (13) is fixedly connected to the centrifugal fan (15).

3. The PDH waste heat boiler inlet flue gas equalization grid according to claim 2, characterized in that, The drive mechanism includes a drive box (803), an incomplete gear (19), a rack (20), and a return spring (21). The drive box (803) is fixedly installed on the side wall of the negative pressure box (802). The incomplete gear (19) is rotatably disposed inside the drive box (803), and the rack (20) is engaged with the incomplete gear (19). The rack (20) is slidably disposed inside the drive box (803). One end of the return spring (21) is fixedly connected to the lower side of the rack (20), and the other end of the return spring (21) is fixedly connected to the bottom of the drive box (803). The connecting shaft (13) is fixedly connected to the incomplete gear (19).

4. The PDH waste heat boiler inlet flue gas equalization grid according to claim 3, characterized in that, Multiple slidable swirl rings (17) are provided inside the mixing tube (804), and multiple swirl plates (16) are fixedly connected to the inner wall of the swirl rings (17). The multiple swirl rings (17) are fixedly connected together by the uprights (18), and the end of the drive rod (807) away from the rack (20) is fixedly connected to an adjacent swirl ring (17).

5. The PDH waste heat boiler inlet flue gas equalization grid according to claim 1, characterized in that, The lower end face of the turbulence plate (9) is provided with a plurality of turbulence grooves (11), and the plurality of turbulence grooves (11) are distributed at equal intervals along the circumference of the turbulence plate (9).

6. The PDH waste heat boiler inlet flue gas equalization grid according to claim 1, characterized in that, The lower end of the main ammonia pipeline (1) is fixedly connected to a hemispherical cover (5), the ball (6) is rolled inside the hemispherical cover (5), the upper end of the support rod (7) is fixedly connected to the ball (6), and the lower end of the support rod (7) is fixedly connected to the upper end of the turbulence plate (9).

7. The PDH waste heat boiler inlet flue gas equalization grid according to claim 1, characterized in that, Each of the mixing tubes (804) is fixedly connected to a vibrating spring (10) at its upper end, and the upper end of the vibrating spring (10) is fixedly connected to the lower end of the turbulence plate (9).

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