CN210905302U - Cyclone ash-removing mixed flow device for rear flue of coal-fired boiler economizer - Google Patents

Abstract

The utility model relates to a cyclone ash removal mixed flow device of a flue behind a coal-fired boiler economizer, which adopts the technical proposal that two layers of cyclone cylinder supporting frames are arranged in a vertical flue below the economizer, each layer of cyclone cylinder supporting frame comprises two transverse track supporting rods, a plurality of transverse sliding sleeves are sleeved on the transverse track supporting rods in a sliding way, a longitudinal track supporting rod is connected between the corresponding transverse sliding sleeves, a plurality of longitudinal sliding sleeves are sleeved on the longitudinal track supporting rods in a sliding way, supporting plates are connected to the side surfaces of the longitudinal sliding sleeves, cyclone cylinder suspension rods are fixedly connected between the supporting plates on the corresponding longitudinal sliding sleeves, the lower ends of the cyclone cylinder suspension rods extend downwards and are fixedly connected with cyclone cylinders, the utility model has novel and unique structure, is simple and reasonable, carries out cyclone mixing and large-particle fly ash separation on flue gas by arranging a plurality of cyclone cylinders in the vertical flue at the lower, the use is flexible.

Description

Cyclone ash-removing mixed flow device for rear flue of coal-fired boiler economizer

Technical Field

The utility model relates to a flue behind the coal fired boiler economizer of thermal power plant, especially a flue whirl ash removal mixed flow device behind coal fired boiler economizer.

Background

In the existing coal-fired boiler, the flow rate behind the economizer is low, the fly ash deposition is more, the flue behind the economizer is directly denitration equipment, most of power plants adopt a method for removing NOx by an SCR catalytic reduction method at present, and the number of catalyst layers is about 3 generally after self-ultra-clean discharge. If the fly ash in the flue gas is more, the part of the catalyst can deposit and cause the jam of catalyst on the catalyst, causes denitration efficiency to be less than the design value, influences denitration system normal operating, need spout more ammonia when reaching design denitration efficiency, causes the equipartition ammonia escape great, produces ammonium bisulfate and blocks up the air preheater to the rear, produces a series of influences. And after passing through the low-temperature superheater and the low-temperature reheater, the flue gas temperature can generate certain deviation, and the temperature still deviates greatly when the denitration inlet is reached, so that improvement and innovation of the denitration inlet are imperative.

SUMMERY OF THE UTILITY MODEL

In view of the above situation, in order to overcome the defects of the prior art, the utility model aims to provide a cyclone dust-removing mixed flow device for the rear flue of a coal-fired boiler economizer, which can effectively solve the problem of flue gas mixed flow and fly ash separation in the rear flue of the economizer.

The utility model provides a technical scheme be:

a rotational flow ash removal mixed flow device for a rear flue of a coal-fired boiler economizer comprises a vertical flue at the lower part of the economizer and a horizontal flue connected to the lower end of the vertical flue, two layers of rotational flow cylinder support frames are arranged in the vertical flue below the economizer, each layer of rotational flow cylinder support frame comprises two transverse rail support rods which are symmetrically arranged at the front side and the rear side of the vertical flue in an inclined manner, a plurality of transverse sliding sleeves are slidably sleeved on the transverse rail support rods, the number of the transverse sliding sleeves on the two transverse rail support rods is equal and in one-to-one correspondence, a longitudinal rail support rod is connected between the corresponding transverse sliding sleeves, a plurality of longitudinal sliding sleeves are slidably sleeved on the longitudinal rail support rod, the side surfaces of the longitudinal sliding sleeves are connected with support plates, the number of the longitudinal sliding sleeves on the upper and lower rotational flow cylinder support frames is equal, the lower end of the cyclone cylinder suspension rod extends downwards and is fixedly connected with a cyclone cylinder, and an ash hopper for receiving fly ash is arranged at the bottom of the vertical flue right below the cyclone cylinder.

Preferably, the cyclone cylinder comprises a central cylinder body, a plurality of spiral cyclone blades are uniformly distributed on the outer wall of the central cylinder body, and the cyclone cylinder suspension rod is fixedly connected to the center of the upper end face of the central cylinder body.

The utility model discloses novel structure is unique, it is simple reasonable, reform transform on original economizer back flue basis can, carry out whirl mixture and large granule flying dust separation to the flue gas through set up a plurality of whirl section of thick bamboos in the vertical flue of economizer lower part, and whirl section of thick bamboo position is adjustable, use in a flexible way, the great problem of economizer back flue gas temperature deviation has been solved, reduce the flue gas temperature deviation of different positions in the flue, guarantee the normal safe operation of equipment, effectively separate the large granule flying dust in the flue gas through the whirl simultaneously, the risk that the flying dust caused catalyst blocking at the position deposit of catalyst has been reduced, high durability and convenient use, and high efficiency, be the innovation on flue whirl ash removal mixed flow device behind coal fired boiler economizer, and has good social and economic benefits.

Drawings

Fig. 1 is a sectional view of the present invention.

Fig. 2 is a partial enlarged view of the swirl tube support frame of the present invention.

Fig. 3 is the utility model discloses a cyclone cylinder support frame's top view, wherein only the 2 group cyclone cylinders in the lower right corner hang a pole installation cyclone cylinder, all the other cyclone cylinders hang a pole and do not install a cyclone cylinder.

Fig. 4 is a schematic structural view of the cyclone cartridge 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 a vertical flue 5 at the lower part of an economizer 3 and a horizontal flue 6 connected at the lower end of the vertical flue 5, two layers of cyclone cylinder supporting frames are arranged in the vertical flue 5 below the economizer 3, each layer of cyclone cylinder supporting frame comprises two transverse track supporting rods 8 which are symmetrically arranged at the front and the rear sides of the vertical flue in an inclined way, a plurality of transverse sliding sleeves 9a are sleeved on the transverse track supporting rods 8 in a sliding way, the transverse sliding sleeves on the two transverse track supporting rods are equal in number and correspond to each other one by one, a longitudinal track supporting rod 10 is connected between the corresponding transverse sliding sleeves, a plurality of longitudinal sliding sleeves 9b are sleeved on the longitudinal track supporting rod 10 in a sliding way, a supporting plate 11 is connected at the side of the longitudinal sliding sleeve 9b, the longitudinal sliding sleeves on the upper and lower layers of cyclone cylinder supporting frames are equal in number and, the lower end of the cyclone cylinder suspension rod 12 extends downwards and is fixedly connected with a cyclone cylinder 13, and an ash hopper 14 for receiving fly ash is arranged at the bottom of the vertical flue right below the cyclone cylinder 13.

In order to ensure the using effect, one end of the transverse track supporting rod 8, which is far away from the horizontal flue, is a higher end, one end of the transverse track supporting rod 8, which is close to the horizontal flue, is a lower end, the lengths of the cyclone cylinder suspension rods 12 are equal, because the transverse track supporting rod 8 is obliquely arranged, the heights of the cyclone cylinders 13 are sequentially reduced from the higher end to the lower end of the transverse track supporting rod, the cyclone cylinder at the higher end is far away from the horizontal flue, the part of wind power far away from the horizontal flue is smaller, a larger distance can be left for fly ash sedimentation, the influence of the flow direction of flue gas is smaller in the sedimentation process, and even if the transverse track supporting rod moves towards the horizontal pipeline in the descending process and drifts for a certain; the vortex exists at the corner of the left wall, and the vortex can be prevented from being influenced by the vortex at the corner because the vortex cylinder is far away from the vortex; the cyclone cylinder at the lower end is closer to the horizontal flue, and the settling distance after cyclone separation is short, so that the fly ash can quickly fall into the ash bucket after cyclone separation and is not brought into the horizontal flue by the flue gas, and the arrangement of high left and low right can more easily perform cyclone separation on the large-particle fly ash in the flue gas and fall into the ash bucket range under the action of gravity after separation. The upper and lower two-layer cyclone cylinder support frame plays a supporting role for the cyclone cylinder, and the cyclone cylinder is effectively prevented from deflecting under the supporting and positioning of the upper and lower two corresponding support plates.

The ash bucket 14 is funnel-shaped with a large upper part and a small lower part, the lower opening of the ash bucket is connected with an inlet of the pump bin 15, an outlet of the pump bin 15 is connected with an ash outlet pipeline 16, a valve 17 is arranged on the ash outlet pipeline 16, the covering range of the upper opening of the ash bucket 14 is larger than that of the cyclone cylinder, conservative fly ash smoothly falls into the range of the ash bucket, when the fly ash in the pump bin needs to be cleared, the valve 17 is opened, and the fly ash in the pump bin is conveyed to the ash bin from the ash outlet pipeline through compressed air.

A first compression bolt 18a for fixing the position of the horizontal sliding sleeve 9a is screwed on the horizontal sliding sleeve 9a, a second compression bolt 18b for fixing the position of the vertical sliding sleeve 9b is screwed on the vertical sliding sleeve 9b, the horizontal positions of the vertical rail supporting rods corresponding to the upper layer and the lower layer can be adjusted by sliding the horizontal sliding sleeves on the horizontal rail supporting rods on the two sides of the upper layer and the lower layer of the cyclone cylinder supporting frames, and the horizontal position adjustment of the cyclone cylinder can be completed by screwing the first compression bolt after the horizontal position adjustment is in place; the longitudinal position of each cyclone cylinder suspension rod can be adjusted by sliding the corresponding longitudinal sliding sleeves on the upper and lower layers of cyclone cylinder support frames along the positions on the longitudinal rail support rods, and the longitudinal position adjustment of the cyclone cylinders can be completed by screwing the second compression bolts after the adjustment is in place; when the flue flow field is changed greatly, the position of the cyclone cylinder can be adjusted according to the flow field, the density of the cyclone cylinder at the position where the flow field is distributed greatly can be increased, and the complete separation is ensured.

The utility model discloses a denitration inlet, including economizer 3, be provided with in the flue on economizer 3 upper portion respectively low temperature reheater pipeline 1 and low temperature superheater pipeline 2 that arrange side by side, be provided with median septum 4 between low temperature reheater pipeline 1 and the low temperature superheater pipeline 2, high temperature flue gas can produce the cigarette temperature deviation after low temperature reheater and low temperature superheater, because low again with low in the pipeline deviation of water temperature cause, low temperature is higher again, low temperature is lower relatively, there is certain degree of mixing after getting into the economizer, but mix inhomogeneously, the flue gas temperature can produce certain deviation, it is great still to deviate the temperature when denitration entry to cause, in this application technical scheme, when the flue gas passes through the whirl section of thick bamboo, form the spiral flow under the water conservancy diversion of whirl blade, just so can carry out the whirl with the flue gas and mix, the flue gas temperature deviation after mixing is eliminated.

The cyclone tube 13 comprises a central tube 131, a plurality of spiral cyclone blades 132 are uniformly distributed on the outer wall of the central tube 131, a suspension rod 12 of the cyclone tube is fixedly connected to the center of the upper end face of the central tube 131, the cyclone tube has a three-dimensional structure as shown in fig. 4, flue gas enters the cyclone blades 132 from the top of the cyclone tube, and under the guiding action of the cyclone blades, the flue gas forms spiral flow, so that the flue gas can be uniformly mixed with the flue gas with larger deviation, and the flue gas is separated from the flue gas under the action of gravity and centrifugal force and naturally falls into an ash settling hopper, so that the large-particle fly ash in the flue gas can be effectively separated.

When the utility model is used, the high temperature flue gas can generate flue gas temperature deviation after passing through the low temperature reheater and the low temperature superheater, because the low temperature is caused by the deviation of the water temperature in the low temperature reheater and the low temperature superheater, the low temperature is higher, the low temperature is relatively lower, and the flue gas can be mixed to a certain degree after entering the economizer, but the mixing is not uniform, after the flue gas enters the cyclone blade from the top of the cyclone cylinder (the flue gas flow direction is shown as the solid arrow a in figure 1), under the guiding action of the cyclone blade, the flue gas forms spiral flow (shown as the dotted arrow b in figure 2), firstly, the flue gas with larger deviation can be uniformly mixed, secondly, in the cyclone process, because the gravity of large particle fly ash is larger, the flue gas is separated from the flue gas under the action of gravity and centrifugal force, the natural sedimentation falls into the ash bucket, thus, the large particle fly ash in, the utility model discloses novel structure is unique, and is simple reasonable, carry out the whirl to the flue gas through set up a plurality of whirl section of thick bamboos in the vertical flue of economizer lower part and mix and the separation of large granule flying dust, and whirl section of thick bamboo position is adjustable, and is flexible to use, the great problem of flue gas temperature deviation behind the economizer has been solved, reduce the flue gas temperature deviation of different positions in the flue, guarantee the normal safe operation of equipment, simultaneously effectively separate the large granule flying dust in the flue gas through the whirl, the risk that the flying dust caused catalyst blocking at the position deposit of catalyst has been reduced, high durability and convenient use, and is effectual, be the innovation on flue whirl ash removal mixed flow device behind coal fired boiler economizer, and has good social and economic benefits.

Claims (6)

1. A cyclone ash removal mixed flow device for a rear flue of a coal-fired boiler economizer comprises a vertical flue (5) at the lower part of the economizer (3) and a horizontal flue (6) connected to the lower end of the vertical flue (5), and is characterized in that two layers of cyclone cylinder support frames are arranged in the vertical flue (5) below the economizer (3), each layer of cyclone cylinder support frame comprises two horizontal rail support rods (8) which are symmetrically arranged at the front side and the rear side of the vertical flue in an inclined manner, a plurality of horizontal sliding sleeves (9a) are sleeved on the horizontal rail support rods (8), the number of the horizontal sliding sleeves on the two horizontal rail support rods is equal and in one-to-one correspondence, a longitudinal rail support rod (10) is connected between the corresponding horizontal sliding sleeves, a plurality of longitudinal sliding sleeves (9b) are sleeved on the longitudinal rail support rod (10), and a support plate (11) is connected to the side surface, the vertical sliding sleeves on the upper and lower layers of the cyclone cylinder supporting frames are equal in number and correspond to one another one by one, a cyclone cylinder suspension rod (12) is fixedly connected between the supporting plates on the corresponding vertical sliding sleeves, the lower end of the cyclone cylinder suspension rod (12) extends downwards and is fixedly connected with a cyclone cylinder (13), and an ash hopper (14) for receiving fly ash is arranged at the bottom of a vertical flue right below the cyclone cylinder (13).

2. The rotational flow ash-removing mixed flow device for the rear flue of the coal-fired boiler economizer as claimed in claim 1, wherein the end of the transverse track support rod (8) far away from the horizontal flue is a higher end, and the end close to the horizontal flue is a lower end.

3. The cyclone ash-removing mixing flow device for the back flue of the coal-fired boiler economizer as claimed in claim 1, wherein the ash hopper (14) is funnel-shaped with a large top and a small bottom, the lower opening of the ash hopper is connected with the inlet of the pump chamber (15), the outlet of the pump chamber (15) is connected with an ash discharge pipeline (16), and the ash discharge pipeline (16) is provided with a valve (17).

4. The rotational flow ash removal mixed flow device for the back flue of the coal-fired boiler economizer as claimed in claim 1, wherein a first compression bolt (18a) for fixing the position of the lateral sliding sleeve (9a) is screwed on the lateral sliding sleeve, and a second compression bolt (18b) for fixing the position of the longitudinal sliding sleeve (9b) is screwed on the longitudinal sliding sleeve.

5. The rotational flow ash removal mixed flow device for the rear flue of the coal-fired boiler economizer according to claim 1, wherein a low-temperature reheater pipeline (1) and a low-temperature superheater pipeline (2) which are arranged side by side are respectively arranged in the flue at the upper part of the economizer (3), and a middle partition plate (4) is arranged between the low-temperature reheater pipeline (1) and the low-temperature superheater pipeline (2).

6. The cyclone dust-removing mixing flow device for the rear flue of the coal-fired boiler economizer as claimed in claim 1, wherein the cyclone barrel (13) comprises a central barrel (131), a plurality of spiral cyclone blades (132) are uniformly distributed on the outer wall of the central barrel (131), and the cyclone barrel suspension rod (12) is fixedly connected to the center of the upper end face of the central barrel (131).

Images