CN210814704U

CN210814704U - SCR deNOx systems catalyst is clear to be arranged grey device

Info

Publication number: CN210814704U
Application number: CN201920588326.9U
Authority: CN
Inventors: 李超; 曲立涛; 于洪海; 杜佳; 齐晓辉; 王德鑫
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-06-23
Anticipated expiration: 2029-04-26

Abstract

The utility model discloses a clear ash device of arranging of SCR deNOx systems catalyst, clear ash device of arranging include deashing ware, windshield washer and row's ash groove. The ash removing device is arranged above the catalyst layer, the ash removing device can move to the ash discharging groove under the driving of the first motor, and the wind shield can realize the opening and closing of the ash discharging groove under the driving of the second motor. When the ash removing action is carried out, the wind shield is driven by the second motor to rotate, the wind shield is enabled to be in the same direction as the flowing direction of flue gas, the ash discharging groove is in an open state, the ash removing device is driven by the first motor to move slowly, and accumulated ash accumulated on the surface of the catalyst layer is removed to the ash discharging groove and discharged. When the ash removal action is not carried out, the ash removal devices are positioned on two sides of the SCR denitration reactor, and the wind shields are perpendicular to the flowing direction of flue gas, so that the ash discharge groove is ensured to be in a closed state. By adopting the device, the smoke dust on the surface of the catalyst layer can be effectively removed, the long-time dust deposition of the catalyst is avoided, and the device has excellent removing effect on the generated local or large-area serious dust deposition.

Description

SCR deNOx systems catalyst is clear to be arranged grey device

Technical Field

The utility model relates to a clear ash device that arranges of SCR deNOx systems catalyst is applicable to the trade that adopts SCR denitration technology such as thermal power plant, industrial furnace, can effectively clear away the smoke and dust on catalyst surface, is particularly useful for the condition that serious deposition has taken place on the catalyst surface.

Background

At present, a Selective Catalytic Reduction (SCR) method is a mainstream denitration process adopted by coal-fired generating sets in China. However, because the content of smoke dust at the inlet of the reactor of the SCR denitration device is very large and the flow field of the smoke dust is complicated and changeable, after a large amount of smoke dust enters the SCR reactor, under the driving of high-speed and uneven airflow, not only the abrasion on the surface of the catalyst is easily caused, but also the dust deposition on the surface of the catalyst is easily caused, even a large amount of dust deposition on the local part of the catalyst is caused, the flow area of the SCR reactor is narrowed, the flow rate of the smoke dust is increased, the abrasion of the catalyst is aggravated, the mechanical damage and even collapse of the catalyst can be caused in severe cases, and.

Most of the existing SCR denitration systems adopt steam soot blowers, sound wave soot blowers or the combination of the steam soot blowers and the sound wave soot blowers, for example, the Chinese patent with the application number of 201521141621.8, however, in the actual operation, no matter the steam soot blowers or the sound wave soot blowers have the conditions of small soot blowing range and poor soot cleaning effect due to the structural characteristics, after long-time operation, the surface of the catalyst is easy to form local or even large-area serious soot deposition, and the existing soot blowers can not clean the formed serious soot deposition. Therefore need improve current soot blower, utility model a novel clear ash device of arranging of catalyst, both realized effectively cleaing away of catalyst deposition, easily installation and maintenance again.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a simple structure, can effectively clear away the clear grey device of arranging of catalyst surface deposition, the device can not only effectively clear away catalyst surface smoke and dust, can clear away local or the serious deposition of large tracts of land moreover, guarantees that the catalyst does not take place the deposition and blocks up, ensures deNOx systems normal operating.

The utility model provides a technical scheme that above-mentioned problem adopted is: an SCR denitration system catalyst ash removal device comprises a boiler, wherein the boiler is communicated with an inlet of a flue, an outlet of the flue is communicated with an inlet of an SCR denitration reactor, an expansion joint and an ammonia injection grid are sequentially arranged in the flue along the flow direction of flue gas, and an outlet of the SCR denitration reactor is communicated with an air preheater; the SCR denitration reactor is characterized in that a guide plate, an ash cleaner, a wind shield, an ash discharge groove and a catalyst layer are arranged in the SCR denitration reactor, the guide plate is arranged at an inlet of the SCR denitration reactor, the number of the catalyst layers is a plurality of layers, the ash cleaner is arranged above each layer of the catalyst layer, the ash discharge groove is arranged in the middle of each layer of the catalyst layer, and the wind shield is arranged above the ash discharge groove.

Furthermore, the ash removing device is arranged on two sides of the SCR denitration reactor and consists of an ash removing brush, an ash removing shaft, a support rod and a motor, the ash removing brush is fixed with the ash removing shaft through the support rod, and the ash removing shaft is connected with the motor. The number of ash removers is such that the ash removal area covers the entire catalyst layer surface.

Furthermore, the ash removal shaft is of a telescopic structure, the distance between the brush head at the lower part of the ash removal brush and the upper surface of the catalyst layer is not more than 10mm, and the overall height of the ash removal brush is not more than 150 mm. The length of the ash removing shaft meets the requirement that the ash removing brush is conveyed to the notch of the ash discharging groove.

Furthermore, the ash discharge groove is formed by gaps among the catalyst layers, the width of the ash discharge groove is 60 mm-100 mm, and the size and the position of the ash discharge groove among the catalyst layers are the same.

Furthermore, the windshield wiper comprises deep bead, axis of rotation and No. two motors, the deep bead welding is in the axis of rotation, the axis of rotation is connected with No. two motors.

Further, the wind shield is arranged on a notch of the ash discharge groove, and the length and the width of the wind shield are substantially equal to those of the ash discharge groove.

Furthermore, the ash removing brush, the ash removing shaft, the wind shield and the rotating shaft are all made of metal.

The working method comprises the following steps that when the ash removing action is not carried out, the ash removing brushes are positioned at two sides of the SCR denitration reactor, the surface of the wind shield and the surface of the catalyst layer are in the same plane, the wind shield is vertical to the flowing direction of flue gas, the ash discharging groove is in a closed state, and the phenomenon that the ash discharging groove is changed into a flue gas channel to cause the reduction of the removal effect of nitrogen oxides is avoided; when the ash removal instruction is sent, after the ash removal device starts to act, the wind shield rotates 90 degrees under the driving of the second motor in the wind shield, the surface of the wind shield is the same as the direction of flue gas, the ash discharge groove is in an open state, the ash removal brush moves towards the center of the SCR denitration reactor at a low speed under the driving of the first motor, and accumulated ash on the surface of the catalyst layer is removed to the ash discharge groove and is discharged from the SCR denitration reactor.

All the ash cleaners are started synchronously or sequentially, and the starting period of the ash cleaners meets the condition that the operation pressure difference of the catalyst layer is within a design value.

Compared with the prior art, the utility model, have following advantage and effect: the dust cleaning brush is adopted, so that the surface smoke dust of the catalyst layer can be effectively cleaned, the long-time dust deposition of the catalyst layer is avoided, the local or large-area serious dust deposition has a good cleaning effect, the dust deposition blockage of the catalyst layer can be avoided by using the dust cleaning brush in combination with the conventional sound wave soot blower, and the normal operation of a denitration system is ensured; by adopting the wind shield, when the ash removal action is not carried out, the ash discharge groove is prevented from being changed into a flue gas channel, and the effect of removing nitrogen oxides is reduced. The utility model discloses a clear ash device that arranges of catalyst, occupation space is little, and processing and installation of being convenient for, power consumption is few, is applicable to current SCR flue gas denitration system.

Drawings

Fig. 1 is a schematic view of an installation position of a catalyst ash removing device in an embodiment of the present invention.

Fig. 2 is a schematic sectional view taken along a-a in fig. 1.

FIG. 3 is a schematic structural view of the ash remover according to the embodiment of the present invention.

Fig. 4 is a schematic structural view of a windshield according to an embodiment of the present invention.

Numbering in the figures: the device comprises a boiler 1, an expansion joint 2, an ammonia injection grid 3, a guide plate 4, an ash remover 5, a wind shield 6, an ash discharge groove 7, a catalyst layer 8, an SCR denitration reactor 9, an air preheater 10, an ash removal brush 5-1, an ash removal shaft 5-2, a support rod 5-3, a first motor 5-4, a wind shield 6-1, a rotating shaft 6-2 and a second motor 6-3.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Fig. 1 is a schematic diagram of the position of the catalyst ash removal device installed in the SCR flue gas denitration system in this embodiment. As shown in figures 1 and 2, the flue gas generated by combustion of the boiler 1 passes through the expansion joints 2 of the horizontal and vertical flues in sequence and is mixed with the NH sprayed from the ammonia-spraying grid 3₃After being fully mixed, the flue gas enters an SCR denitration reactor 9 under the action of a guide plate 4, catalytic reduction reaction is carried out under the action of a catalyst in a catalyst layer 8, and the clean flue gas after nitrogen oxides are removed through reaction finally flows to a downstream air preheater 10.

The device for cleaning and discharging the ash of the catalyst of the SCR denitration system in the embodiment comprises an ash cleaner 5, a wind shield 6 and an ash discharge groove 7. The ash remover 5 is arranged on the surface of the first layer catalyst layer 8, high-concentration smoke dust in the smoke from the boiler 1 falls on the surface of the catalyst layer 8 and is gradually accumulated when passing through the SCR denitration reactor 9, and when ash removal action is carried out, the ash remover 5 removes the smoke dust on the surface of the catalyst layer 8 and discharges the smoke dust out of the SCR denitration reactor 9 through the ash discharge groove 7 (synchronously adjusting the surface of the wind shield 6-1 to be in the same direction as the smoke gas), so that continuous and stable operation of a denitration system is ensured.

As shown in FIG. 3, a group of ash cleaning devices 5 is composed of an ash cleaning brush 5-1, an ash cleaning shaft 5-2, two inclined supporting rods 5-3 and a motor 5-4. The ash removal brush 5-1 is made of metal materials and can do low-speed reciprocating motion along the ash removal shaft 5-2, when the ash removal action is not performed, the ash removal brush 5-1 is located on one side of the SCR denitration reactor 9, when the ash removal action is performed, the ash removal brush 5-1 is driven by a motor 5-4 to move at a low speed until smoke and dust are removed to an ash discharge groove 7, the ash removal action is completed, and an inclined support rod 5-3 is arranged between the ash removal brush 5-1 and the ash removal shaft 5-2 to improve the structural strength of the whole device. The number of the ash cleaning devices 5 is a plurality, and the ash cleaning brushes 5-1 are required to cover the surface of the whole catalyst layer 8, so that the ash cleaning dead angle of the prior art is eliminated. All the ash cleaners 5 are started synchronously or sequentially, and the starting period is required to meet the condition that the operating pressure difference of the catalyst is within the designed value.

As shown in FIG. 4, the windshield 6 is composed of a windshield 6-1, a rotating shaft 6-2 and a second motor 6-3. The wind shield 6-1 is welded on the rotating shaft 6-2, and the wind shield 6-1 and the rotating shaft 6-2 are driven by the second motor 6-3 to rotate. When the ash removing action is not carried out, the surface of the wind shield 6-1 and the surface of the catalyst layer 8 are in the same plane, and the ash discharging groove 7 is in a closed state; when the ash removing instruction is sent out, after the ash removing device 5 starts to act, the wind shield 6-1 rotates 90 degrees under the driving of the second motor 6-3, the surface of the wind shield 6-1 is the same as the flowing direction of the flue gas, and the ash discharging groove 7 is in an open state. The wind shield 6 is mainly used for opening and closing the ash discharge groove 7, the ash discharge groove 7 is in an open state during ash removal, and the removed smoke is discharged out of the SCR denitration reactor 9 through the ash discharge groove 7; when the ash removing action is not carried out, in order to avoid the ash discharging groove 7 from becoming a flue gas channel and reduce the effect of removing nitrogen oxides, the wind shield 6 is arranged to enable the ash discharging groove 7 to be in a closed state.

Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as being included in the following claims.

Claims

1. An SCR denitration system catalyst ash removal device comprises a boiler (1), wherein the boiler (1) is communicated with a flue inlet, a flue outlet is communicated with an inlet of an SCR denitration reactor (9), an expansion joint (2) and an ammonia injection grid (3) are sequentially arranged in the flue along the flow direction of flue gas, and an outlet of the SCR denitration reactor (9) is communicated with an air preheater (10); the SCR denitration catalyst is characterized in that a guide plate (4), an ash remover (5), a wind shield (6), an ash discharge groove (7) and a catalyst layer (8) are arranged in an SCR denitration reactor (9), the guide plate (4) is arranged at an inlet of the SCR denitration reactor (9), the number of the catalyst layers (8) is a plurality of layers, the ash remover (5) is arranged above each layer of the catalyst layer (8), the ash discharge groove (7) is arranged in the middle of each layer of the catalyst layer (8), and the wind shield (6) is arranged above the ash discharge groove (7).

2. The catalyst ash removing and discharging device of the SCR denitration system according to claim 1, wherein the ash removing device (5) is arranged on two sides of the SCR denitration reactor (9), the ash removing device (5) is composed of an ash removing brush (5-1), an ash removing shaft (5-2), a support rod (5-3) and a motor (5-4), the ash removing brush (5-1) is fixed with the ash removing shaft (5-2) through the support rod (5-3), and the ash removing shaft (5-2) is connected with the motor (5-4).

3. The catalyst ash removing and discharging device of the SCR denitration system according to claim 2, wherein the ash removing shaft (5-2) is of a telescopic structure, the distance between the brush head at the lower part of the ash removing brush (5-1) and the upper surface of the catalyst layer (8) is not more than 10mm, and the overall height of the ash removing brush (5-1) is not more than 150 mm.

4. The catalyst ash removing and discharging device of the SCR denitration system according to claim 1, wherein the ash discharging groove (7) is formed by the gap between each catalyst layer (8), the width of the ash discharging groove (7) is 60mm to 100mm, and the size and the position of the ash discharging groove (7) between each catalyst layer (8) are the same.

5. The SCR denitration system catalyst ash removal device of claim 1, wherein the wind shield (6) comprises a wind shield (6-1), a rotating shaft (6-2) and a second motor (6-3), the wind shield (6-1) is welded on the rotating shaft (6-2), and the rotating shaft (6-2) is connected with the second motor (6-3).

6. The SCR denitration system catalyst ash removing device of claim 5, wherein the wind shield (6) is arranged at the notch of the ash discharging groove (7), and the length and the width of the wind shield (6-1) are equal to those of the ash discharging groove (7).