CN218409992U

CN218409992U - Automatic disturbance device of air preheater entry deposition

Info

Publication number: CN218409992U
Application number: CN202222742073.0U
Authority: CN
Inventors: 黄尚军; 王江; 张焱; 杨�远; 余浪浪; 陈浩; 周灵灵; 朱帆; 周加红
Original assignee: Guizhou Xineng Electric Power Construction Co ltd
Current assignee: Guizhou Xineng Electric Power Construction Co ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2023-01-31
Anticipated expiration: 2032-10-18

Abstract

The utility model discloses an automatic disturbance device for ash deposition at an inlet of an air preheater, which comprises a disturbance steam branch pipe, wherein the disturbance steam branch pipe is transversely and horizontally arranged from a denitration outlet to the bottom of a slope section flue at the inlet of the air preheater, the head end of the disturbance steam branch pipe is connected with a steam main pipe, the tail end of the disturbance steam branch pipe is connected with an output pipe, and the disturbance steam branch pipe is arranged at the flue part and is transversely and uniformly provided with a plurality of disturbance nozzles at preset intervals; the steam main pipe is connected with a steam source, and a disturbance steam manual valve, a disturbance steam electric valve and a disturbance steam automatic control valve are respectively arranged on the steam main pipe; the tail end of the output pipe is connected with the sewage discharge tank, and the output pipe is provided with a manual primary valve and a manual secondary valve. This device reduces flue slope deposition through the automatic disturbance of timing to boiler denitration export to air preheater entry flue slope section deposition, reduces air preheater and blocks up the probability, guarantees the unit safety and stability operation when improving unit operation economy.

Description

Automatic disturbance device of air preheater entry deposition

Technical Field

The utility model belongs to the technical field of power plant boiler burning, concretely relates to automatic disturbance device of air preheater entry deposition.

Background

Coal fired boiler uses the long-time operation of high ash content coal kind, the flue gas ash content is big, denitration export is seriously piled up to air preheater entry slope section flying dust, pile up after the take the altitude, receive the influence of gravity, a large amount of deposition gliding to air preheater flue gas side, lead to heat accumulation component local blocking, air preheater differential pressure risees, the primary air differential pressure is high and undulant big, draught fan, primary air fan current rise, influence boiler operation combustion stability, reduce unit area load capacity, lead to unit economic operation efficiency to reduce.

In addition, after the heat storage element of the air preheater is partially blocked, the boiler unit can only be used for washing when being stopped and maintained, and the boiler unit needs to be unpacked and washed when being serious, so that the maintenance cost is increased, and the maintenance time is long.

SUMMERY OF THE UTILITY MODEL

The utility model provides an automatic disturbance device of air preheater entry deposition realizes exporting to air preheater entry flue slope section deposition timing automatic disturbance to boiler denitration, reduces flue slope deposition, reduces air preheater and blocks up the probability, ensures unit safety and stability operation when improving unit operation economy.

The utility model discloses a technical scheme be, an automatic disturbance device of air preheater entry deposition, including disturbance steam branch pipe, the horizontal arrangement of disturbance steam branch pipe exports to air preheater entry slope section flue bottom in the denitration, and the female pipe of steam is connected to disturbance steam branch pipe head end, trailing end connection output tube, and disturbance steam branch pipe is located the horizontal even interval predetermined distance of flue part and sets up a plurality of disturbance spout.

Preferably, the steam main pipe is connected with a steam source, and a disturbance steam manual valve, a disturbance steam electric valve and a disturbance steam automatic control valve are respectively arranged on the steam main pipe.

Preferably, a drain pipe is further arranged on the steam main pipe and connected with the soot blower, and a drain electric primary valve and a drain electric secondary valve are arranged on the drain pipe.

Preferably, the head end of the output pipe is connected with the disturbance steam branch pipe, the tail end of the output pipe is connected with the sewage draining box, and the output pipe is provided with a manual primary valve and a manual secondary valve.

Preferably, the air outlet direction of the disturbance nozzle is horizontal to and vertical to the bottom of the flue.

Preferably, the spacing between adjacent perturbation jets is 800mm.

Compared with the prior art, the beneficial effects of the utility model are that: the device utilizes the boiler steam to automatically and regularly disturb the accumulated ash on the slope section of the flue from the denitration outlet of the boiler to the inlet of the air preheater, thereby solving the problems that the accumulated ash on the slope section of the flue from the denitration outlet to the inlet of the air preheater is too thick, a large amount of accumulated ash simultaneously slides down to the heat storage element at the hot end of the air preheater, the local blockage of the heat storage element of the air preheater is serious, the differential pressure of the air preheater is increased, the differential pressure of primary air is high and fluctuates greatly, the current of an induced draft fan and a primary air fan is increased, and the combustion of the boiler is unstable; the device is simple in arrangement, convenient to operate and good in using effect.

Drawings

FIG. 1 is a schematic view of the present invention;

the figure is marked with: 1. the system comprises a disturbance steam branch pipe, a steam main pipe, a steam manual valve, a disturbance steam electric valve 22, a disturbance steam automatic control valve 23, a disturbance steam automatic control valve 3, an output pipe 31, a manual primary valve 32, a manual secondary valve 4, a disturbance nozzle 5, a drain tank 51, a drain electric primary valve 52 and a drain electric secondary valve.

Detailed Description

The invention will be further explained with reference to the drawings attached to the specification in order to facilitate better understanding by those skilled in the art.

Example 1

As shown in figure 1, the automatic disturbance device for the ash deposition at the inlet of the air preheater comprises a disturbance steam branch pipe 1, a steam main pipe 2 and an output pipe 3. Disturbance steam branch pipe 1 is horizontal arranges in denitration export to air preheater entry slope section flue bottom, and the main pipe of steam 2 is connected to disturbance steam branch pipe 1 head end, and the main pipe of steam 2 is connected the steam source (boiler steam output tube), and the output tube 3 of 1 end connection of disturbance steam branch pipe, and disturbance steam branch pipe 1 lies in the horizontal even interval predetermined distance of flue part and sets up a plurality of disturbance spout 4, utilizes boiler steam to carry out the disturbance to the deposition and sweeps.

Specifically, the air outlet direction of the disturbance nozzle 4 is horizontal and vertical to the bottom of the flue, so that the disturbance purging effect on the bottom of the flue is best; the distance between the adjacent disturbing nozzles 4 is 800mm, and the steam pressure is insufficient due to too small distance, and the steam disturbance coverage range is small due to too large distance.

Preferably, two groups of disturbance steam branch pipes 1 are arranged, the two groups of disturbance steam branch pipes 1 are arranged in parallel at the horizontal width of the flue at a preset interval, the disturbance area of the bottom of the flue is increased, disturbance steam flow is formed at the bottom of the flue, the overall disturbance effect is enhanced, and disturbance dead angles are reduced.

And a disturbance steam manual valve 21, a disturbance steam electric valve 22 and a disturbance steam automatic control valve 23 are sequentially arranged on the steam main pipe 2. The manual disturbance steam valve 21 is a standby valve and is used when the electric disturbance steam valve 22 fails, so that the use reliability of the device is ensured. The automatic control valve 23 for disturbing steam is set to start and close time, so that the automatic control valve can be started and stopped at regular time, and workers do not need to operate on site, thereby being beneficial to reducing the labor cost and reducing the personal safety hidden danger.

Still be equipped with drain pipe 5 on the female pipe 2 of steam, drain pipe 5 connects the flash tank of surely arranging, be equipped with hydrophobic electronic primary valve 51 and hydrophobic electronic secondary valve 52 on the drain pipe 5, guarantee that the female pipe 2 of steam exports the steam of sufficient atmospheric pressure to disturbance steam branch pipe 1.

The head end of the output pipe 3 is connected with the disturbance steam branch pipe 1, the tail end of the output pipe is connected with the sewage discharge tank, and the output pipe 3 is provided with a manual primary valve 31 and a manual secondary valve 32; when the interior of the output pipe 3 has dust or foreign matters, the manual primary valve 31 and the manual secondary valve 32 are opened to perform blow-down purging so as to ensure that the disturbance nozzle 4 is not blocked by the foreign matters or the dust.

The working principle is as follows: disturbance steam passes through the steam main pipe 2, is controlled by the electric primary drainage valve 51 and the electric secondary drainage valve 52 of the drainage pipe 5 to drain, is controlled by the manual disturbance steam valve 21 and the electric disturbance steam valve 22 to enter, realizes the timed disturbance dust deposition function by setting the opening and closing time of the automatic steam control valve 23, and when in purging, the manual primary valve 31 and the manual secondary valve 32 on the output pipe 3 are closed. When the interior of the output pipe 3 has dust or foreign matters, the manual primary valve 31 and the manual secondary valve 32 on the output pipe 3 are opened to blow down and purge, and the dust or the foreign matters are discharged to a blow-down box, so that the disturbance nozzle 4 is not blocked by the foreign matters or the dust.

By adopting the technology, the timing automatic disturbance of the accumulated ash on the slope section of the flue from the denitration outlet of the boiler to the inlet of the air preheater can be realized, the accumulated ash on the slope of the flue is reduced, the blockage probability of the air preheater is reduced, and the safe and stable operation of the unit is ensured while the operation economy of the unit is improved.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit and principles of the present invention, various modifications and improvements of the technical solution of the present invention will be considered by those skilled in the art within the scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides an automatic disturbance device of air preheater entry deposition, its characterized in that, includes disturbance steam branch pipe (1), the horizontal level of disturbance steam branch pipe (1) is arranged and is exported to air preheater entry slope section flue bottom in the denitration, and the female pipe of steam (2) is connected to disturbance steam branch pipe (1) head end, trailing end connection output tube (3), and disturbance steam branch pipe (1) lie in the horizontal even interval predetermined distance of flue part and set up a plurality of disturbance spout (4).

2. The automatic disturbance device for the ash deposition at the inlet of the air preheater according to claim 1, wherein the steam main pipe (2) is connected with a steam source, and a manual disturbance steam valve (21), an electric disturbance steam valve (22) and an automatic disturbance steam control valve (23) are respectively arranged on the steam main pipe (2).

3. The automatic disturbance device for the ash deposition at the inlet of the air preheater according to claim 2, wherein a drain pipe (5) is further arranged on the steam main pipe (2), and a drain electric primary valve (51) and a drain electric secondary valve (52) are arranged on the drain pipe (5).

4. The automatic disturbance device for the ash deposition at the inlet of the air preheater according to claim 1, wherein the head end of the output pipe (3) is connected with the disturbance steam branch pipe (1), the tail end of the output pipe is connected with the blowdown tank, and the output pipe (3) is provided with a manual primary valve (31) and a manual secondary valve (32).

5. The automatic disturbance device for the ash deposition at the inlet of the air preheater according to claim 1, wherein the air outlet direction of the disturbance nozzle (4) is horizontal and vertical to the bottom of the flue.

6. The automatic stirring device for the ash deposition at the inlet of the air preheater as claimed in claim 1, wherein the distance between the adjacent stirring nozzles (4) is 800mm.