Air-cooled jacket type slagging pipe

Abstract

An air-cooled jacket type slagging pipe comprises a slagging pipe body, a main body part of the slagging pipe body is arranged in an air chamber below a hearth, the upper end of the slagging pipe body extends into the hearth, and the lower end of the slagging pipe body extends out of the air chamber; the slagging pipe body comprises an inner sleeve and an outer sleeve arranged on the outer wall of the inner sleeve in a sleeving mode, and the outer sleeve is of a hollow structure. The bottom of the outer sleeve is closed and the top is provided with an air spray hole; the outer wall of the outer sleeve is provided with an air source interface communicated with an inner cavity of the outer sleeve; the outer wall of the inner sleeve is provided with cooling fins which are arranged in the circumferential direction of the outer wall of the inner sleeve and arranged in an inner cavity of the outer sleeve. According to the air-cooled jacket type slagging pipe, on one hand, compressed air is adopted as a cooling medium, the overall operation temperature of the slagging pipe is reduced, the expansion difference generated by thermal expansion of the slagging pipe is reduced, and therefore the service life of the slagging pipe is prolonged; on the other hand, the cooled compressed air is fed into the hearth through a small hole formed in the upper part of the slag tap jacket, so that the fluidization of materials around the slag tap is increased, and the slag tap is assisted.

Description

Technical Field

[0001] The utility model relates to the field of boilers, in particular to an air-cooled jacketed slag discharge pipe. Background Art

[0002] The slag discharge pipe of a circulating fluidized bed boiler refers to a pipe at the bottom of the boiler used to discharge the ash in the furnace. In a circulating fluidized bed boiler, the bottom ash generated by combustion in the furnace is discharged through the slag discharge pipe to maintain a certain bed pressure and bed temperature. The slag discharge pipes currently used in the industry are mainly divided into two structural types: water-cooled and insulated. The water-cooled slag discharge pipe is generally composed of an inner and outer jacket. The hot slag is discharged downward from the inner jacket, and the cooling water cools the jacket to take away the heat; its advantage is that the slag discharge pipe has a lower operating temperature, and the expansion difference with the water-cooled air chamber is small, so there is no need to consider the expansion seal with the furnace bottom air chamber, and the degree of wear is not high; the disadvantage is that the upper weld of the jacket often fails due to wear and tear due to the violent disturbance of the material in the furnace, thereby leaking cooling water into the furnace, seriously affecting the overall safe operation of the boiler. The insulated slag dropping pipe is generally made of a wear-resistant insulation layer and a metal steel pipe; its advantage is that the structure is simple to process, but its overall operating temperature is relatively high (the ash temperature in the furnace is about 850-950°C), resulting in an expansion difference of about 50-80mm between the slag dropping pipe and the furnace bottom wind chamber. The sealing expansion structure at the furnace bottom must be considered during design and manufacturing. The sealing structure often fails, resulting in ash leakage and the furnace is forced to shut down, which affects the safe and stable operation of the boiler unit. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide an air-cooled jacketed slag tapping pipe to solve the technical problems involved in the above-mentioned background technology.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] An air-cooled jacketed slag tapping pipe comprises a slag tapping pipe body, the main body of which is placed in a wind chamber below a furnace, the upper end of the slag tapping pipe body extends to the inside of the furnace, and the lower end of the slag tapping pipe body extends to the outside of the wind chamber;

[0006] The slag discharge pipe body includes an inner sleeve and an outer sleeve sleeved on the outer wall of the inner sleeve, and the outer sleeve is a hollow structure; the bottom of the outer sleeve is closed and an air nozzle is provided on the top, and an air source interface connected to the inner cavity of the outer sleeve is provided on the outer wall of the outer sleeve; the outer wall of the inner sleeve is provided with heat dissipation fins arranged circumferentially along the outer wall of the inner sleeve and placed in the inner cavity of the outer sleeve.

[0007] In the above utility model, further, the air spray holes include a plurality of air spray holes arranged in an array along the circumference of the outer sleeve.

[0008] In the above utility model, further, a check valve is provided on the gas source interface.

[0009] In the above utility model, further, the inner sleeve and the outer sleeve are both made of GH4145 nickel-based alloy steel.

[0010] In the above utility model, further, the heat dissipation fins are copper heat dissipation fins.

[0011] The beneficial effects of the utility model are:

[0012] The air-cooled jacketed slag tapping pipe provided herein uses compressed air as a cooling medium to reduce the overall operating temperature of the slag tapping pipe. As the temperature decreases, the expansion difference caused by its thermal expansion will also decrease, thereby increasing its service life; on the other hand, the cooled compressed air is sent into the furnace through the small holes provided on the upper part of the slag tapping port jacket, thereby increasing the fluidization of the material around the slag tapping port and assisting in slag tapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the matching structure of the utility model and the furnace;

[0014] Figure 2 It is a front view of the utility model;

[0015] Figure 3 It is a top view of the utility model;

[0016] Figure 4 It is a cross-sectional view of the utility model.

[0017] In the figure, 1-slag discharge pipe body, 2-furnace, 3-wind chamber, 1.1-inner casing, 1.2-outer casing, 1.3-air spray hole, 1.4-air source interface, 1.5-heat dissipation fins, 1.6-check valve. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0020] Example:

[0021] An air-cooled jacketed slag tapping pipe, see the attached Figure 2 As shown, it includes a slag tapping pipe body 1, the main part of which is placed in a wind chamber 3 below a furnace 2, the upper end of the slag tapping pipe body 1 extends to the inside of the furnace 2, and the lower end of the slag tapping pipe body 1 extends to the outside of the wind chamber 3;

[0022] Please continue to refer to the attached Figure 1 As shown, the slag tapping pipe body 1 comprises an inner sleeve 1.1 and an outer sleeve 1.2 sleeved on the outer wall of the inner sleeve 1.1, wherein the outer sleeve 1.2 is a hollow structure; the bottom of the outer sleeve 1.2 is closed, and the outer sleeve 1.2 is used for the attachment. Figure 3 As shown, the top of the outer sleeve 1.2 is provided with an air spray hole 1.3, and the air spray hole 1.3 is placed inside the furnace 2. The outer wall of the outer sleeve 1.2 is provided with an air source interface 1.4 that is connected to the inner cavity of the outer sleeve 1.2; Figure 4 As shown, the outer wall of the inner sleeve 1.1 is provided with heat dissipation fins 1.5 which are arranged along the circumference of the outer wall of the inner sleeve 1.1 and placed in the inner cavity of the outer sleeve 1.2.

[0023] In the implementation of the utility model, the hot slag in the furnace 2 is discharged outward through the inner sleeve 1.1. During the slag discharge process, the compressed air is forced into the outer sleeve 1.2 through the air source interface 1.4. The compressed air takes away the heat of the heat dissipation fins 1.5, reducing the slag discharge temperature of the inner sleeve 1.1. As the temperature decreases, the expansion difference caused by the thermal expansion of the slag discharge pipe body 1 will also decrease, thereby increasing its service life. At the same time, the temperature of the compressed air is high, and the heated compressed air is sent into the furnace through the air nozzle 1.3. The high-temperature compressed air can not only improve the combustion efficiency in the furnace 2, but also increase the fluidization of the materials around the slag discharge port, playing a role in assisting the slag discharge.

[0024] In the above embodiment, please refer to the attached Figure 3 As shown, the air spray holes 1.3 include a plurality of air spray holes arranged in an array along the circumference of the outer sleeve 1.2, which can not only increase the air output of the outer sleeve 1.2 and improve the cooling efficiency, but also increase the material fluidization area around the slag discharge port, which is more conducive to slag discharge.

[0025] Preferably, a check valve 1.6 is provided on the air source interface 1.4 to prevent the compressed air from flowing back to the outside, and the inner sleeve 1.1 and the outer sleeve 1.2 are both made of GH4145 nickel-based alloy steel, which has high strength and good corrosion resistance and oxidation resistance, thereby improving the service life of the slag discharge pipe body 1. The heat dissipation fins 1.5 are copper heat dissipation fins, which have high thermal conductivity and have higher heat dissipation efficiency than other aluminum alloy heat dissipation fins under large air flow conditions.

[0026] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. An air-cooled jacketed slag tapping pipe, characterized in that: It comprises a slag discharge pipe body, the main body of which is placed in the wind chamber below the furnace, the upper end of the slag discharge pipe body extends to the inside of the furnace, and the lower end of the slag discharge pipe body extends to the outside of the wind chamber; The slag discharge pipe body includes an inner sleeve and an outer sleeve sleeved on the outer wall of the inner sleeve, and the outer sleeve is a hollow structure; the bottom of the outer sleeve is closed and an air nozzle is provided on the top, and an air source interface connected to the inner cavity of the outer sleeve is provided on the outer wall of the outer sleeve; the outer wall of the inner sleeve is provided with heat dissipation fins arranged circumferentially along the outer wall of the inner sleeve and placed in the inner cavity of the outer sleeve.

2. The air-cooled jacketed slag tapping pipe according to claim 1, characterized in that: The air spray holes include a plurality of air spray holes arranged in an array along the circumference of the outer sleeve.

3. The air-cooled jacketed slag tapping pipe according to claim 1, characterized in that: A check valve is arranged on the gas source interface.

4. The air-cooled jacketed slag tapping pipe according to claim 1, characterized in that: The inner sleeve and the outer sleeve are both made of GH4145 nickel-based alloy steel.

5. The air-cooled jacketed slag tapping pipe according to claim 1, characterized in that: The heat dissipation fins are copper heat dissipation fins.

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