CN210021746U

CN210021746U - Boiler SCR reactor inlet guiding device

Info

Publication number: CN210021746U
Application number: CN201920776964.3U
Authority: CN
Inventors: 陈育; 祝英浩; 朱家英; 李有信; 黄金磊; 程金武; 安敬学; 赵瑞松; 杨正凯
Original assignee: Huazhong Electric Power Test Research Institute China of Datang Corp Science and Technology Research Institute Co Ltd
Current assignee: Huazhong Electric Power Test Research Institute China of Datang Corp Science and Technology Research Institute Co Ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-02-07
Anticipated expiration: 2029-05-28

Abstract

The utility model relates to a boiler SCR reactor inlet guiding device, which adopts the technical proposal that the boiler SCR reactor inlet guiding device comprises an SCR reactor and an inlet flue connected to the flue gas inlet at the upper part of the SCR reactor, wherein the inlet flue comprises a first horizontal flue positioned below the flue gas inlet of the SCR reactor, a vertical flue connected at one end of the first horizontal flue and a second horizontal flue connected at the upper end of the vertical flue, the outlet of the second horizontal flue is connected with the flue gas inlet of the SCR reactor, and a plurality of angle-adjustable guide plates are arranged between the vertical flue and the second horizontal flue, the utility model has the advantages of novel and unique structure, simplicity and reasonableness, can flexibly adjust the angle of the guide plates according to the coal quality condition, meets the requirement of preventing the increase of downstream ammonia escape caused by uneven flue gas flow distribution under different coal qualities, is convenient to use and has good effect, and is an innovation on the guiding device, has good social and economic benefits.

Description

Boiler SCR reactor inlet guiding device

Technical Field

The utility model belongs to the technical field of thermal power plant pulverized coal fired boiler SCR reactor entry guiding device technique and specifically relates to a boiler SCR reactor entry guiding device.

Background

Because the nitrogen oxide emission of China increases fast, coal fired power plants have all carried out the denitration transformation in recent years, for preventing that flue gas flow inequality from causing the nitrogen oxide to distribute unevenly, influence the denitration effect, set up the guide plate between vertical flue of SCR reactor entry and horizontal flue. The guide plate is designed by comprehensive consideration, the coal quality and the smoke gas amount of the checked coal quality are subjected to numerical simulation to determine the optimal angle, and the guide plate is fixed after installation. However, at present, because the coal quality source of a thermal power plant changes greatly, the coal quality used for actual combustion changes greatly compared with the coal quality of the original design and the coal quality checking, the change of the smoke gas amount is obvious, and the fixed guide plate does not meet the actual requirements, the ammonia escape amount at the outlet of the SCR reactor is increased, and the using effect is not satisfactory, so the improvement and the innovation of the device are imperative.

SUMMERY OF THE UTILITY MODEL

To the above situation, for overcoming the defects of the prior art, the utility model aims to provide a boiler SCR reactor entry guiding device, which can effectively solve the problem of SCR reactor entry flue flow field regulation.

The technical scheme of the utility model provides a, a boiler SCR reactor entry guiding device, including the SCR reactor and connect the entry flue on SCR reactor upper portion flue gas entry, the entry flue is including being located the first horizontal flue of SCR reactor flue gas entry below, connecting the vertical flue of first horizontal flue one end and connecting the second horizontal flue of vertical flue upper end, the export of second horizontal flue links to each other with the flue gas entry of SCR reactor, is provided with the guide plate of a plurality of adjustable angles between vertical flue and the second horizontal flue, is equipped with the flue gas flow detection device who is used for detecting flue gas flow in the first horizontal flue, is provided with ammonia escape detection device in the export of SCR reactor lower part, and the drive part of flue gas flow detection device, ammonia escape detection device and guide plate links to each other with the computer respectively.

The guide plate is provided with a rotating shaft which is fixed together, the two ends of the rotating shaft are rotatably connected with the two side walls of the inlet flue, one end of the rotating shaft extends out of the outer side of the side wall of the inlet flue, a first gear is fixedly sleeved on the extended end, a motor is fixed on the side wall of the inlet flue, and a second gear meshed with the first gear is fixedly sleeved on the rotating shaft of the motor to form an angle adjusting driving structure of the guide plate.

The utility model discloses novel structure is unique, and is simple reasonable, can be according to the coal quality condition, and the angle of nimble guide plate of adjusting satisfies under the different coal qualities and prevents that flue gas flow distributes the inequality and cause the requirement of low reaches ammonia escape increase, convenient to use, effectual is the innovation on SCR reactor entry flue guiding device, has good society and economic benefits.

Drawings

Fig. 1 is a schematic structural diagram (the inlet flue is partially cut open), in which the direction of the arrow indicates the flow direction of the flue gas.

Fig. 2 is a sectional side view of the deflector of the present invention.

Fig. 3 is a partial enlarged view of the baffle of fig. 1 according to the present invention.

Fig. 4 is a circuit connection frame diagram of the present invention.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in the figures 1-4, the utility model comprises an SCR reactor 4 and an inlet flue connected with the flue gas inlet at the upper part of the SCR reactor 4, wherein the inlet flue comprises a first horizontal flue 1 positioned below the flue gas inlet of the SCR reactor, a vertical flue 2 connected with one end of the first horizontal flue 1 and a second horizontal flue 3 connected with the upper end of the vertical flue 2, the outlet of the second horizontal flue 3 is connected with the flue gas inlet of the SCR reactor 4, a plurality of angle-adjustable guide plates 6 are arranged between the vertical flue 2 and the second horizontal flue 3, a flue gas flow detection device 9 for detecting the flue gas flow is arranged in the first horizontal flue 1, an ammonia escape detection device 5 and a flue gas flow detection device 9 are arranged on the outlet 4a at the lower part of the SCR reactor 4, the ammonia escape detection device 5 and the driving part of the guide plate 6 are respectively connected with a computer.

In order to ensure the using effect, the guide plate 6 is provided with a rotating shaft 7 which is fixed together, two ends of the rotating shaft 7 are rotatably connected with two side walls of the inlet flue, one end of the rotating shaft 7 extends out of the outer side of the side wall of the inlet flue, the extending end is fixedly sleeved with a first gear 12, a motor 13 is fixed on the side wall of the inlet flue, a second gear 14 meshed with the first gear 12 is fixedly sleeved on the rotating shaft of the motor 13 to form an angle adjusting driving structure of the guide plate, and the motor 13 is a driving part of the guide plate 6 and is connected with a computer in the embodiment.

The guide plate 6 is fixedly connected with the rotating shaft 7 through a clamp 10, the clamp 10 and the guide plate 6 can be welded and fixed, and the clamp 10 and the rotating shaft 7 can also be welded and fixed.

A bearing 11 is arranged between the rotating shaft 7 and the inlet flue, a first protective cover 16 and a second protective cover 15 are respectively fixed on the inlet flue outside the bearing 11 at two sides, the first gear 12 and the second gear 14 are both positioned in the second protective cover 15, and the motor 13 is fixed in the second protective cover 15; as shown in fig. 2, the motor 13 may be fixed to the bottom plate of the second shield 15 by bracket welding. The protection casing protects the transmission part.

The transmission ratio of the first gear 12 to the second gear 14 is 1: 4-6, namely the second gear 14 rotates for 4-6 circles, and the first gear 12 meshed with the second gear rotates for 1 circle, so that the rotating amplitude of the guide plate 6 can be reduced, and the position adjustment of the guide plate is more accurate.

The guide plate 6 is an arc-shaped panel with a circular arc-shaped section, the side of the concave surface of the arc-shaped panel is close to the flue gas in the vertical flue 2, and the guide plate 6 is used for enabling the flue gas in the vertical flue 2 to smoothly and uniformly transit from the vertical flue to the second horizontal flue 3 and then enter the SCR reactor 4, so that the increase of downstream ammonia escape caused by uneven distribution of flue gas flow is prevented.

And auxiliary transition guide plates 8 with downward concave surfaces are arranged at corners at the upper ends of the vertical flue 2 and the second horizontal flue 3, so that uneven flow distribution or eddy current at the corners is prevented.

The SCR reactor is a boiler selective catalytic reduction reactor of a coal-fired power plant, and the technology is the prior art of the coal-fired power plant.

In the above description, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the invention.

The computer is a computer of a power plant DCS control system, the power plant DCS control system is called a distributed control system for short, and the distributed control system integrates an execution component and a data acquisition function, acquires the flue gas flow in the first horizontal flue 1 through a flue gas flow detection device 9 connected with the computer, and displays the flue gas flow on a display, wherein the flue gas flow detection device 9 is a prior art, such as a matrix flow measurement device which is sold by Nanjing Watt technology Limited and has a model number of WTFM1201SP120 or WTFM1201SH 160; meanwhile, an ammonia escape detection device 5 connected with the ammonia escape detection device is used for collecting an ammonia escape value at an outlet of the SCR reactor 4 and displaying the value on a display, the ammonia escape detection device 5 is the prior art, such as a Siemens LDS6 ammonia escape laser analyzer sold by Roche Automation technology Limited, Shantou, with the model number of 7MB6121-0CF00-0FX1LDS6, which collects flue gas flow and the ammonia escape value through a DCS control system and displays the value on the display as the prior art, and is clear to technicians in the field, the ammonia escape value on the display is used, if the ammonia escape value is increased and exceeds a set value, a computer is used for controlling a motor to rotate forwards or backwards, the angle of a guide plate 6 is adjusted, the flue gas flow field is changed, so that the increase of downstream escape ammonia caused by uneven flue gas flow distribution is prevented under different coal qualities, and the flue gas flow value can play a certain early warning role, if the flue gas flow is greatly increased, the downstream ammonia escape amount is likely to be immediately increased, and technicians need to prepare to adjust the angle of the guide plate 6 at any time, when the guide plate is adjusted specifically, the computer is used for controlling the motor to rotate forwards and backwards for manual work, if the motor is rotated forwards and backwards, the second gear drives the first gear to rotate so as to drive the rotating shaft to rotate, the guide plate is rotated to drive the guide plate to rotate, after a certain angle is adjusted, the ammonia escape amount on the display is observed, and if the ammonia escape amount is gradually reduced but is not reduced to a set value, the adjustment is continued until the ammonia escape amount is lower than the set value; a plurality of ammonia escape continues the increase, then notifies computer antiport motor, makes the ammonia escape volume of observing on the display, until ammonia escape volume be less than the setting value can, compare with prior art, the utility model discloses novel structure is unique, and is simple reasonable, can be according to the coal quality condition, nimble angle of adjusting the guide plate satisfies the requirement that prevents flue gas flow distribution inequality under the different coal qualities and cause low reaches ammonia escape increase, convenient to use, and is effectual, is the innovation on SCR reactor entry flue guiding device, has good society and economic benefits.

Claims

1. The utility model provides a boiler SCR reactor entry guiding device, includes SCR reactor (4) and connects the entry flue on SCR reactor (4) upper portion flue gas entry, its characterized in that, the entry flue is including first horizontal flue (1) that is located SCR reactor flue gas entry below, connect in vertical flue (2) of first horizontal flue (1) one end and connect in second horizontal flue (3) of vertical flue (2) upper end, the export of second horizontal flue (3) links to each other with the flue gas entry of SCR reactor (4), is provided with guide plate (6) of a plurality of adjustable angles between vertical flue (2) and second horizontal flue (3), is equipped with flue gas flow detection device (9) that are used for detecting flue gas flow in first horizontal flue (1), is provided with ammonia escape detection device (5) on export (4a) of SCR reactor (4) lower part, and the driving parts of the smoke flow detection device (9), the ammonia escape detection device (5) and the guide plate (6) are respectively connected with the computer.

2. The boiler SCR reactor inlet diversion device of claim 1, wherein the diversion plate (6) is provided with a rotating shaft (7) fixed together, two ends of the rotating shaft (7) are rotatably connected with two side walls of the inlet flue, one end of the rotating shaft (7) extends out of the side wall of the inlet flue, a first gear (12) is fixedly sleeved on the extended end, a motor (13) is fixed on the side wall of the inlet flue, and a second gear (14) meshed with the first gear (12) is fixedly sleeved on the rotating shaft of the motor (13) to form an angle adjustment driving structure of the diversion plate.

3. Boiler SCR reactor inlet guide device according to claim 2, characterized in that the deflector (6) is fixedly connected to the shaft (7) by means of a clamp (10).

4. The boiler SCR reactor inlet flow guiding device according to claim 2, wherein a bearing (11) is arranged between the rotating shaft (7) and the inlet flue, a first protective cover (16) and a second protective cover (15) are respectively fixed on the inlet flue outside the bearings (11) at two sides, the first gear (12) and the second gear (14) are both positioned in the second protective cover (15), and the motor (13) is fixed in the second protective cover (15).

5. The boiler SCR reactor inlet baffle device of claim 2, wherein the gear ratio of the first gear (12) to the second gear (14) is 1: 4-6.

6. The boiler SCR reactor inlet guide device according to claim 1, wherein the guide plate (6) is a cambered plate with a circular arc-shaped cross section, and the side of the cambered plate where the concave surface is located is close to the flue gas in the vertical flue (2) in the incoming direction.

7. The boiler SCR reactor inlet baffle device of claim 1, wherein a concave downward auxiliary transition baffle (8) is disposed at a corner of the upper end of the vertical flue (2) and the second horizontal flue (3).