CN218763467U

CN218763467U - Cyclone double-layer nozzle with lower spray pipe of pneumatic soot blowing system of coal-fired boiler

Info

Publication number: CN218763467U
Application number: CN202222646408.9U
Authority: CN
Inventors: 冯旭; 宁玉琴; 孙少鹏
Original assignee: Hangzhou Huadian Energy Engineering Co ltd
Current assignee: Hangzhou Huadian Energy Engineering Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-03-28
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses a whirlwind double-layer equation nozzle of coal fired boiler strength soot blowing system lower spray tube, including cylindrical air chamber, air chamber head and lower spray tube, the welding of air chamber head has seted up the gas port at the middle part of cylindrical air chamber at the top of cylindrical air chamber, lower spray tube welding on the cylindrical air chamber, and the spout has been seted up to gas port and lower spray tube intercommunication on the cylindrical air chamber, and the spout is located the top of lower spray tube, and the bottom of cylindrical air chamber is provided with the formula of sinking connector for connect compressed air or steam medium pipeline. The utility model has simple structure, low cost, convenient use and wide market prospect; the design adopts a directional and cyclone double-layer mode to improve the soot blowing effect of the pneumatic soot blowing system, improve the soot blowing capacity of the soot blowing system and effectively solve the problem of soot deposition at dead corners of a flue of a coal-fired boiler.

Description

Cyclone double-layer nozzle with lower spray pipe of pneumatic soot blowing system of coal-fired boiler

Technical Field

The utility model relates to a whirlwind double-deck formula nozzle that is used for pneumatic soot blowing system area lower spray tube of coal fired boiler level of thermal power factory and afterbody flue, the serious department of deposition carries out directional and whirlwind double-deck formula pneumatic soot blowing in mainly used coal fired boiler level of thermal power factory and the afterbody flue, can effectively solve the deposition problem of coal fired boiler level and afterbody flue.

Background

When a coal-fired boiler of a large-scale thermal power plant operates, a large amount of dust can be generated in horizontal and tail flues generally, and if the dust in the flues can not be taken away by flue gas in time, the situation that the dust is more and more serious can be caused, and the operation safety of the coal-fired boiler is damaged.

When a coal-fired boiler of a large-scale thermal power plant operates, ash is easily accumulated in horizontal and tail flues, the horizontal flue cannot be carried away by smoke due to the fact that smoke flows to form a negative pressure backflow area in a certain area, smoke turbulence and flowing dead angle areas exist in the tail flues, particularly at reducing positions, elbows and the like, and the smoke cannot be carried away by the smoke to form a large amount of ash. A large amount of dust in the flue firstly influences a flue gas flow field in the flue, so that the flue gas flow is uneven, and the local heat exchanger is scoured and worn; a large amount of accumulated dust is accumulated on the surface of the heat exchanger, so that the heat exchange of the heat exchanger is influenced; a large amount of dust is accumulated in the tail flue, so that flue collapse accidents can be caused, and the safe operation of the boiler is seriously influenced.

The conventional soot blowers on coal-fired boilers of thermal power plants respectively have advantages and disadvantages, such as steam soot blowers, sound wave soot blowers, gas pulse soot blowers and the like. The steam soot blowing effect is good, but soot blowing dead angles exist, and blowing damage is caused to a heat exchange surface; the acoustic soot blowing effect is limited; the pulse soot blower generates huge sound energy and a large amount of high-temperature and high-speed gas instantly, so that accumulated soot is splashed and taken away with flue gas, and the heat exchange surface is oscillated, impacted and flushed in a shock wave mode; the three common soot blowers can not effectively remove the accumulated soot in horizontal, elbow and dead-angle flues.

At present, a pneumatic soot blowing system using steam or compressed air as a medium is demonstrated and applied to a coal-fired boiler, and the pneumatic soot blowing mode can effectively perform pneumatic soot blowing on an area where soot is easy to accumulate in a flue at fixed points and at fixed time, so that the accumulated soot is blown upwards and taken away by flue gas. Among the published chinese patents, patent with application number CN201720765889.1 discloses a soot blowing system for a horizontal flue of a boiler, which includes a compressed air main pipe and a plurality of soot blowing units, each of which includes a compressed air branch pipe, a manual gate valve, an electromagnetic valve, a pressure gauge, a plurality of blast caps and a plurality of wear-resistant tiles. The nozzle is used as a key part, has a single structure, has dead corners in a soot blowing area, and has the problem of limited soot blowing effect.

In conclusion, the pneumatic soot blowing system can effectively solve the problem of soot deposition at dead corners of horizontal and tail flues of the coal-fired boiler. However, the nozzle is used as a key part, plays an important role in the pneumatic soot blowing effect, and has important significance in pertinently applying nozzles in different forms according to the characteristics of different flue soot deposits.

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 novel structural design, simple structure, cost are lower, work safety, be used for improving thermal power factory coal fired boiler level and afterbody flue's the strength soot blowing system soot blowing ability the coal fired boiler strength blow the whirlwind double-layer type nozzle of spray tube down of soot system.

The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a coal fired boiler strength soot blowing system area whirlwind double-deck formula nozzle of spray tube down, includes cylindrical air chamber, air chamber head and lower spray tube, characterized by, the welding of air chamber head is at the top of cylindrical air chamber, the middle part of spray tube welding at cylindrical air chamber down, the gas port has been seted up on the cylindrical air chamber, gas port and lower spray tube intercommunication, the spout has been seted up on the cylindrical air chamber, the spout is located the top of spray tube down, the bottom of cylindrical air chamber is provided with sunken formula connector for connect compressed air or steam medium pipeline.

Furthermore, six nozzles are uniformly arranged on the cylindrical air chamber in the circumferential direction and are positioned at the upper part of the cylinder.

Furthermore, the cylindrical air chamber is evenly provided with four air ports in the circumferential direction, the lower spray pipes are also provided with four air ports, and the air ports are located at the welding positions of the lower spray pipes and correspond to the lower spray pipes one to one.

Further, the air chamber end socket is of a circular structure.

Furthermore, the included angle between the jet flow direction of all the nozzles and the tangent line of the side wall of the cylindrical air chamber is 45 degrees.

Furthermore, an included angle between the jet flow direction of the lower spray pipe and the side wall of the cylindrical air chamber is 45 degrees.

Furthermore, the pipe orifice of the lower spray pipe faces the direction of the wall surface or the heat exchange surface of the flue, and the section of the pipe orifice of the lower spray pipe is parallel to the direction of the wall surface or the heat exchange surface of the flue.

The working principle is as follows: the nozzle is arranged in the areas where dust easily deposits in horizontal and tail flues of the coal-fired boiler, compressed air or steam is used as a medium for soot blowing, the compressed air or steam enters the cylindrical air chamber through the sunken connecting port, one path of medium is sprayed out from six nozzles, because the included angle between the jet flow direction of the nozzles and the tangent line of the side wall of the cylindrical air chamber is 45 degrees, the medium is sprayed and swept in the direction of the included angle of 45 degrees with the tangent line of the cylindrical air chamber, and the medium sprayed out from the six nozzles forms a cyclone type compressed air or steam jet flow field to blow and fluidize the dust in the flues; another way medium flows from four gas ports, gets into four lower spray tubes, and the medium is spout by the mouth of pipe of lower spray tube, because contained angle between the efflux direction of lower spray tube and the lateral wall of cylindrical air chamber becomes 45 degrees, and the mouth of pipe of lower spray tube is towards the direction of flue wall or heat-transfer surface, and compressed air or steam medium carry out directional injection towards the direction of flue wall or heat-transfer surface through the mouth of pipe of lower spray tube, blows the deposition in the flue and rises the fluidization, and four lower spray tubes guarantee that the nozzle all around can both blow, and the directional efflux of lower spray tube has strengthened the disturbance to the deposition, has effectively solved the flue deposition and has piled up the problem. Two paths of media are sprayed in two different blowing modes, and disturbance to accumulated dust is enhanced by cyclone jet flow, so that the nozzle can be blown in all directions of 360 degrees.

Furthermore, a plurality of groups of nozzles can be arranged in the soot deposition area of the flue according to the soot cleaning area.

Furthermore, the installation direction of the nozzle is that the central line of the cylindrical air chamber is vertical to the wall surface or the heat exchange surface of the flue.

Furthermore, the installation height of the nozzle is flexibly adjusted according to the height of accumulated dust in the flue, and the maximum installation height is 500mm away from the wall surface or the heat exchange surface of the flue.

Compared with the prior art, the utility model, have following advantage and effect:

1. the problem of dust deposition at dead corners of the flue of the coal-fired boiler can be effectively solved.

2. Simple structure, low cost, convenient use and wide market prospect.

3. The design adopts a directional and cyclone double-layer mode to improve the soot blowing effect of the pneumatic soot blowing system and improve the soot blowing capacity of the soot blowing system.

4. The directional and cyclone double-layer compressed air or steam jet flow is formed to blow the deposited dust in the flue, the cyclone jet flow enhances the disturbance to the deposited dust, the nozzle can be blown to the full 360-degree direction, the directional jet flow of the lower spray pipe enhances the disturbance to the deposited dust, and the problem of the accumulated dust accumulation of the flue is effectively solved.

Drawings

Fig. 1 is a schematic view of the overall structure of the nozzle of the present invention.

Fig. 2 is a schematic sectional view of the plane B-B in fig. 1.

Fig. 3 is a schematic sectional view of the plane C-C in fig. 1.

In the figure: the device comprises a cylindrical air chamber 1, an air chamber end enclosure 2, a lower spray pipe 3, a nozzle 4, an air port 5 and a sinking type connecting port 6.

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.

Examples

Referring to fig. 1 to 3, in the embodiment, a cyclone double-layer nozzle with a lower spray pipe of a coal-fired boiler pneumatic soot blowing system comprises a cylindrical air chamber 1, an air chamber end enclosure 2 and a lower spray pipe 3, wherein the air chamber end enclosure 2 is welded at the top of the cylindrical air chamber 1, the lower spray pipe 3 is welded at the middle part of the cylindrical air chamber 1, an air port 5 is formed in the cylindrical air chamber 1, the air port 5 is communicated with the lower spray pipe 3, a nozzle 4 is formed in the cylindrical air chamber 1, the nozzle 4 is located above the lower spray pipe 3, and a sunken connecting port 6 is formed in the bottom of the cylindrical air chamber 1 and used for connecting a compressed air or steam medium pipeline.

In this embodiment, six nozzles 4 are uniformly arranged in the circumferential direction of the cylindrical air chamber 1, and the nozzles 4 are located at the upper portion of the cylinder.

In this embodiment, the cylindrical air chamber 1 is uniformly provided with four air ports 5 in the circumferential direction, the lower spray pipes 3 are also provided with four air ports, and the air ports 5 are located at the welding positions of the lower spray pipes 3 and correspond to the lower spray pipes 3 one by one.

In this embodiment, the gas chamber end enclosure 2 is a circular structure.

In this embodiment, the included angle between the jet flow direction of all the nozzles 4 and the tangent of the side wall of the cylindrical air chamber 1 is 45 degrees.

In this embodiment, the included angle between the jet direction of the lower nozzle 3 and the side wall of the cylindrical air chamber 1 is 45 degrees.

In this embodiment, the nozzle of the lower nozzle 3 faces the direction of the wall surface or the heat exchange surface of the flue, and the nozzle section of the lower nozzle 3 is parallel to the direction of the wall surface or the heat exchange surface of the flue.

In the embodiment, a plurality of groups of nozzles are arranged in the soot deposition area of the flue according to the soot cleaning area, and the installation direction of the nozzles is that the central line of the cylindrical gas chamber 1 is vertical to the wall surface or the heat exchange surface of the flue. The mounting height of the nozzle is flexibly adjusted according to the height of dust deposition in the flue, and the maximum mounting height is 500mm away from the wall surface or the heat exchange surface of the flue.

The working method comprises the following steps: when the pneumatic soot blowing system blows soot, compressed air or steam enters the cylindrical air chamber 1 through the sunken connecting port 6, one path of medium is sprayed out from the six nozzles 4, because the included angle between the jet flow direction of the nozzles 4 and the tangent line of the side wall of the cylindrical air chamber 1 is 45 degrees, the medium is sprayed and swept in the direction of the included angle of 45 degrees with the tangent line of the cylindrical air chamber 1, and the medium sprayed out from the six nozzles 4 forms a cyclone compressed air or steam jet flow field to blow and fluidize the soot in a flue; another way medium flows from four gas ports 5, get into four lower spray pipes 3, the medium is spout by the mouth of pipe of lower spray pipe 3, because the contained angle between the efflux direction of lower spray pipe 3 and the lateral wall of cylindrical air chamber 1 becomes 45 degrees, the mouth of pipe of lower spray pipe 3 is towards the direction of flue wall or heat-transfer surface, compressed air or steam medium carry out directional injection towards the direction of flue wall or heat-transfer surface through the mouth of pipe of lower spray pipe 3, blow the deposition in the flue and rise the fluidization, four lower spray pipes 3 guarantee that the all directions all around of nozzle can both blow, the disturbance to the deposition has been strengthened to the directional efflux of lower spray pipe 3, flue deposition pile up the problem has effectively been solved. Two paths of media are sprayed in two different blowing modes, and the disturbance of the cyclone jet flow on accumulated dust is enhanced, so that the nozzle can be blown in all directions of 360 degrees.

In the embodiment, the adopted soot blowing medium is compressed air or steam with the pressure of 0.8-1MPa, and the consumption and the pressure of the compressed air or the steam are ensured.

In the embodiment, an intermittent soot blowing mode is adopted, the blowing time is 3 minutes each time, and the interval is 5 minutes each time.

Those not described in detail in this specification are well within the skill of the art.

In addition, it should be noted that the above contents described in the present specification are only illustrations of the structure of the present invention. All equivalent changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions by those skilled in the art may be made to the described embodiments without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a coal fired boiler strength soot blowing system area whirlwind double-deck formula nozzle of spray tube down, includes cylindrical air chamber (1), air chamber head (2) and lower spray tube (3), characterized by, the top at cylindrical air chamber (1) is welded in air chamber head (2), lower spray tube (3) welding is at the middle part of cylindrical air chamber (1), gas port (5) have been seted up on cylindrical air chamber (1), gas port (5) and lower spray tube (3) intercommunication, spout (4) have been seted up on cylindrical air chamber (1), spout (4) are located the top of lower spray tube (3), the bottom of cylindrical air chamber (1) is provided with formula connector (6) that sinks for connect compressed air or steam medium pipeline.

2. The cyclone double-layer nozzle with the lower spray pipe of the coal-fired boiler pneumatic soot blowing system as claimed in claim 1, wherein six spray nozzles (4) are uniformly arranged on the cylindrical air chamber (1) in the circumferential direction, and the spray nozzles (4) are positioned at the upper part of the cylinder.

3. The cyclone double-layer type nozzle with the lower spray pipe of the coal-fired boiler pneumatic soot blowing system according to claim 1 is characterized in that four air ports (5) are uniformly arranged on the cylindrical air chamber (1) in the circumferential direction, the number of the lower spray pipes (3) is also four, and the air ports (5) are positioned at the welding position of the lower spray pipes (3) and correspond to the lower spray pipes (3) one by one.

4. The cyclone double-layer nozzle with the lower spray pipe of the pneumatic soot blowing system of the coal-fired boiler as claimed in claim 1, characterized in that the air chamber end enclosure (2) is of a circular structure.

5. The cyclone double-layer nozzle with the lower spray pipe of the coal-fired boiler pneumatic soot blowing system according to claim 1 or 2, characterized in that the included angle between the jet direction of all the nozzles (4) and the tangent of the side wall of the cylindrical air chamber (1) is 45 degrees.

6. The cyclone double-layer nozzle with the lower spray pipe of the coal-fired boiler pneumatic soot blowing system as claimed in claim 1, wherein the included angle between the jet direction of the lower spray pipe (3) and the side wall of the cylindrical air chamber (1) is 45 degrees.

7. The cyclone double-layer nozzle with the lower spray pipe of the coal-fired boiler pneumatic soot blowing system as claimed in claim 1 or 6, wherein the nozzle of the lower spray pipe (3) faces the direction of the wall surface or the heat exchange surface of the flue, and the section of the nozzle of the lower spray pipe (3) is parallel to the direction of the wall surface or the heat exchange surface of the flue.