CN218328202U

CN218328202U - Sealing device for soot blower and soot blower

Info

Publication number: CN218328202U
Application number: CN202221641166.8U
Authority: CN
Inventors: 段小云; 黄二仙
Original assignee: Guangzhou Zhongdian Lixin Thermal Power Co ltd
Current assignee: Guangzhou Zhongdian Lixin Thermal Power Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-01-17
Anticipated expiration: 2032-06-28

Abstract

The embodiment of the utility model provides a relate to soot blower technical field, especially relate to a sealing device and soot blower for soot blower. The sealing device for the soot blower comprises a furnace wall interface box body and a pipeline. The furnace wall interface box body is arranged at the position of a soot blowing gun inlet and outlet hole of a wall surface, and a soot blowing gun inlet is formed in the wall part of the furnace wall interface box body relative to the wall surface; the pipeline is equipped with air inlet, first gas outlet and second gas outlet, the external compressed air source of air inlet, first gas outlet intercommunication holds the chamber, forms first air current passageway between air inlet and the first gas outlet, the passageway of second gas outlet intercommunication soot blower gun, the one end that the soot blower deviates from the wall or keeps away from one section of wall is located with the junction of soot blower gun to the second gas outlet, forms second air current passageway between second gas outlet and the air inlet. That is, the utility model provides a sealing device for soot blower has solved the technical problem that dust got into soot blower in the boiler.

Description

Sealing device for soot blower and soot blowing equipment

Technical Field

The embodiment of the utility model provides a relate to soot blower technical field, especially relate to a sealing device and soot blower for soot blower.

Background

The large coal-fired boiler has huge heating surfaces, including a water-cooled wall, a reheater, a superheater, an economizer and the like. During the operation of the boiler, a large amount of flue gas carries fly ash to pass through the heating surfaces, and due to factors such as the viscosity, sedimentation and electrostatic induction of the fly ash, a plurality of fly ash particles are attached to the tube rows on the heating surfaces to form accumulated ash. The deposited ash has larger thermal resistance and certain corrosiveness, so the deposited ash on the tube bank of the heating surface must be cleaned regularly, the heating surface is kept clean, and the thermal resistance is reduced. The traditional heating surface cleaning technology adopts a telescopic soot blower, wherein nozzles are arranged on two sides of the top of a spray pipe of the soot blower, the nozzles are symmetrically arranged at 180 degrees, an outer sleeve of a soot blowing gun of the soot blower rotates forwards to advance and rotates backwards when the soot blower works, and the two nozzles rotate spirally along with the outer sleeve of the soot blower in the working process. The soot blowing medium (steam) is spirally sprayed by utilizing the traveling displacement of the soot blower, and the heating surface is swept, so that the soot blowing purpose is achieved.

The prior art has the following defects:

(1) The existing soot blower is vertically installed on the outer side of a furnace wall, and a circular hole slightly larger than a soot blowing gun nozzle is directly formed in the corresponding position on the furnace wall in order to ensure that the soot blowing gun stretches into and withdraws from the furnace wall during soot blowing. In order to ensure the normal advance and retreat of the soot blower, the nozzle of the soot blower must be over against the inlet and outlet hole, or a small section is left in the hole for guiding. When the soot blower works, the soot blowing gun is rotationally pushed in or withdrawn, so a certain gap is inevitably left at the joint surface of the soot blowing gun and a circular hole (an inlet and an outlet of the soot blowing gun) of a furnace wall, and when the positive pressure is generated in the furnace, furnace smoke and furnace ash can be sprayed out to pollute the environment.

(2) When the soot blower does not blow soot, in order to protect the soot blower from being burnt out by high-temperature flue gas, the soot blower needs to be withdrawn out of the furnace after soot blowing is finished, and a soot blowing steam source is automatically closed. If the soot blowing gun is completely withdrawn out of the furnace, the soot blowing gun inlet and outlet holes are necessarily exposed, and when the hearth is pressurized positively, the furnace dust and the furnace smoke are necessarily ejected from the holes to pollute the environment and the ground.

(3) If the spray head of the soot blower is left at the position of the soot blower gun inlet and outlet, a large amount of furnace ash is inevitably poured into the inner sleeve and the outer sleeve of the soot blower from the soot blower gun spray head and blown to the soot blower valve along the sleeves when the pressure in the boiler is positive. The soot blowing gun is composed of an inner sleeve and an outer sleeve, because the soot blower adopts high-pressure steam, a steam inlet pipe, namely an inner pipe, needs to be fixed, one section of the inner pipe is connected with a steam inlet valve, and the other end of the inner pipe is communicated with an outer pipe; in order to ensure the safety of the soot blower and the distance and length of soot blowing, the outer pipe is sleeved on the inner pipe; the outer tube is a telescopic gun tube, and under the drive of the traveling motor, the outer tube stretches into or withdraws from the furnace in a rotating way, and the top end of the outer tube is provided with a spray head. And filling materials are laid between the inner sleeve and the outer sleeve to realize the sealing between the outer pipe and the inner pipe. And realizes continuous sealing in the forward and backward rotating and propelling process of the soot blowing gun barrel. When the pressure in the furnace is positive, the furnace dust flows back into the soot blowing gun from the soot blower nozzle and is retained between the inner and outer sleeves, so that the sealing of the inner and outer sleeves generates gaps and fails, and the steam is sprayed outwards during soot blowing.

(4) If the soot blowing gun head of the soot blower is left in the soot blowing hole on the furnace wall, the furnace ash not only can block the soot blower gun head, but also can deform the gun head due to the high-temperature radiation heat of the boiler, so that the path of the nozzle of the soot blowing gun head is changed slightly, the soot blowing effect cannot be achieved, the gun head is damaged if the nozzle is damaged, and the gun head or the soot blower is forced to be replaced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at: a sealing device for a soot blower is provided, which is used for solving the technical problem that dust in a boiler enters a soot blower.

A sealing device for a soot blower is provided that includes a furnace wall interface box and a conduit. The furnace wall interface box body is internally provided with a containing cavity, the furnace wall interface box body is arranged at a soot blowing gun inlet and outlet hole of a wall surface, and a soot blowing gun inlet is formed in the wall part of the furnace wall interface box body, which is opposite to the wall surface; the pipeline is equipped with air inlet, first gas outlet and second gas outlet, the external compressed air source of air inlet, first gas outlet intercommunication hold the chamber, form first air current passageway between air inlet and the first gas outlet, the second gas outlet intercommunication the passageway of soot blower, the second gas outlet with the junction of soot blower is located soot blower deviates from the one end of wall or keeps away from one section of wall, the second gas outlet with form second air current passageway between the air inlet.

Optionally, a first valve is disposed on the first air flow channel.

Optionally, a second valve is disposed on the second air flow channel.

Optionally, a three-way connector is arranged on the pipeline, the air inlet is arranged on the three-way connector, and the other two connectors of the three-way connector are respectively communicated with the first airflow channel and the second airflow channel.

Optionally, the pressure of the compressed air source is set to be 0.2-0.8MPa higher than atmospheric pressure.

Optionally, a sealing member is arranged between the furnace wall interface box body and the wall surface.

The utility model also provides a soot blower includes soot blower and sealing device. Wherein the soot blower includes soot blowing.

Compared with the prior art, the utility model discloses a sealing device for soot blower has following beneficial effect:

the sealing device for the soot blower comprises a furnace wall interface box body and a pipeline. The furnace wall interface box body is arranged at a soot blowing gun inlet and outlet hole of a wall surface, and a soot blowing gun inlet is formed in the wall part of the furnace wall interface box body relative to the wall surface; the pipeline is equipped with air inlet, first gas outlet and second gas outlet, the external compressed air source of air inlet, first gas outlet intercommunication hold the chamber, form first air current passageway between air inlet and the first gas outlet, the second gas outlet intercommunication the passageway of soot blower, the second gas outlet with the junction of soot blower is located soot blower deviates from the one end of wall or keeps away from one section of wall, the second gas outlet with form second air current passageway between the air inlet.

The compressed air flows in from the air inlet, is divided into two air flows and flows through the first air flow channel and the second air flow channel respectively. When the soot blowing gun extends into the soot blowing gun inlet and outlet hole of the wall surface, a gap is formed between the soot blowing gun and the soot blowing gun inlet and outlet hole, and the air flow in the first air flow channel flows from one side of the containing cavity to one side of the boiler along the gap to prevent dust in the boiler from leaking into the soot blower or air from the gap. And secondly, the air flow in the second air flow channel is blown out from one end of the soot blowing gun to the other end close to the wall surface, so that dust is prevented from entering the soot blowing gun when the soot blowing device stops. When the soot blower is in a working state, the pressure of the inner flow passage of the soot blower is greater than that of the second airflow passage, and the second airflow passage does not work temporarily. That is, the utility model provides a sealing device for soot blower has solved the technical problem that dust got into soot blower in the boiler.

Drawings

Fig. 1 is a schematic diagram of a sealing device for a soot blower and a soot blower according to an embodiment of the present invention.

FIG. 2 is a schematic view of another perspective of a sealing arrangement for a sootblower.

In the figure, 1, a sealing device for a soot blower; 100. a furnace wall interface box body; 101. a cavity;

200. a pipeline; 201. an air inlet; 202. a first air outlet; 203. a second air outlet; 204. a first air flow passage; 205. a second airflow channel; 210. a three-way interface;

300. a first valve;

400. a second valve;

2. a soot blower; 400. a soot blowing gun;

3. a wall surface.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and fig. 2, a schematic view of a sealing device 1 for a soot blower and a schematic view of another view angle of the sealing device 1 for the soot blower according to the embodiment of the present invention are respectively given. The sealing device 1 for the soot blower of the utility model comprises a furnace wall interface box body 100 and a pipeline 200. The furnace wall interface box 100 is internally provided with a cavity 101, the furnace wall interface box 100 is arranged at a soot blowing gun inlet and outlet of the wall surface 3, and the wall part of the furnace wall interface box 100 corresponding to the wall surface 3 is provided with a soot blowing gun 500 inlet. The pipeline 200 is provided with an air inlet 201, a first air outlet 202 and a second air outlet 203, the air inlet 201 is externally connected with a compressed air source, the first air outlet 202 is communicated with the cavity 101, a first air flow channel 204 is formed between the air inlet 201 and the first air outlet 202, the second air outlet 203 is communicated with a channel of the soot blowing gun 500, the joint of the second air outlet 203 and the soot blowing gun 500 is arranged at one end of the soot blowing gun 500 departing from the wall surface 3 or one section of the wall surface 3, and a second air flow channel 205 is formed between the second air outlet 203 and the air inlet 201.

Specifically, the pipe 200 is provided with a first valve 300 and a second valve 400. The first valve 300 is disposed on the first gas flow path 204, and the second valve 400 is disposed on the second gas flow path 205. The first valve 300 and the second valve 400 are used to adjust the pressure of the gas flow path in addition to functioning as a closed path. In addition, a three-way connector 210 is arranged on the pipeline 200, the air inlet 201 is arranged on the three-way connector 210, and the other two connectors of the three-way connector 210 are respectively communicated with the first air flow channel 204 and the second air flow channel 205.

Preferably, the pressure of the compressed air source is set to 0.2-0.8MPa above atmospheric pressure. The first valve 300 and the second valve 400 may function to adjust the pressure value of the compressed air entering the flow passage. Conventionally, a seal (not shown) is provided between the furnace wall interface box 100 and the wall surface 3.

The utility model also provides a soot blower, including any kind of sealing device 1 that is used for the soot blower more than soot blower 2. Wherein the sootblower 2 comprises a sootblower gun 500.

The utility model discloses an implementation: the furnace wall interface box 100 covers the soot blowing gun inlet and outlet holes of the wall surface 3, and the soot blowing gun 500 is coaxially arranged with the holes. When the soot blower 2 stops operating, the gun head of the soot blowing gun 500 retreats and remains in the accommodating cavity 101; when the soot blower 2 is operated, the soot blowing gun 500 forwards passes through the cavity 101 and then enters a wall body and a working area in the furnace. After the compressed air source is turned on, the pressure on one side of the chamber 101 is maintained higher than the pressure on one side of the interior of the boiler, so that dust in the boiler cannot flow out from the gap between the sootblower 500 and the wall hole. In addition, when the soot blower 2 is started, the pressure of the airflow in the soot blowing gun 500 is greater than that of the second airflow channel 205, and the second airflow channel 205 is in a closed state; when the soot blower 2 stops, the pressure of the second airflow channel 205 can prevent the boiler flue gas from invading the soot blowing gun 500, and meanwhile, a certain cooling effect is also achieved, so that the soot blowing gun 500 can be cooled continuously, the radiation heat damage of the high-temperature flue gas in the boiler is reduced, and the service life of the soot blower 2 is prolonged.

To sum up, the utility model discloses can prevent the dust in the boiler to get into the soot blower for the probability that the packing between inside sleeve pipe of soot blower, interior overcoat intertube is sealed, the soot blower valve receives the flue gas erosion reduces by a wide margin, and the life-span extension has reduced the maintenance volume, reduces cost of maintenance. After the first installation and debugging are completed, the whole process of the device can realize automatic sealing, the service life of the soot blower is greatly prolonged, and a good protection effect on the field environment is also realized.

It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention; further, it will be apparent to those skilled in the art that modifications and variations can be made in the light of the above teachings, and all such modifications and variations are intended to be within the scope of the present invention.

Claims

1. A sealing device for a sootblower comprising:

the furnace wall interface box body is internally provided with a containing cavity, the furnace wall interface box body is arranged at a soot blowing gun inlet and outlet hole of a wall surface, and the wall part of the furnace wall interface box body, which is opposite to the wall surface, is provided with a soot blowing gun inlet;

the pipeline, it is equipped with air inlet, first gas outlet and second gas outlet, the external compressed air source of air inlet, first gas outlet intercommunication hold the chamber, form first air current passageway between air inlet and the first gas outlet, the second gas outlet intercommunication the passageway of soot blower gun, the second gas outlet with the junction of soot blower gun is located soot blower gun deviates from the one end of wall or keeps away from one section of wall, the second gas outlet with form second air current passageway between the air inlet.

2. The sealing device for a sootblower of claim 1, wherein a first valve is disposed on said first air flow passage.

3. The sealing device for a sootblower of claim 1, wherein a second valve is provided on said second air flow channel.

4. The sealing device for a soot blower of claim 1, wherein a three-way connection is provided on the pipe, the air inlet is provided on the three-way connection, and the other two connections of the three-way connection are respectively communicated with the first air flow channel and the second air flow channel.

5. The sealing device for a sootblower of claim 1, wherein the pressure of the compressed air source is set 0.2-0.8MPa above atmospheric pressure.

6. The sealing device for a sootblower of claim 1, wherein a seal is provided between said furnace wall interface box and a wall surface.

7. A sootblower, comprising:

a sootblower including a sootblower gun;

the sealing device for a sootblower of any of claims 1-6.