Double medium hanging pipe structure for deep peak regulation tower type boiler

Abstract

A double medium hanging pipe structure for a deep peak regulation tower type boiler belongs to the technical field of coal-fired power generation boilers, and is used to solve the problems that the cooling capacity of the existing hanging pipe structure is seriously insufficient under the working condition of long time wet state operation, there is a risk of pipe explosion shutdown, and the safe and stable operation of the unit is seriously affected. The application comprises a separator, a separator outlet connecting pipe, a separator inlet connecting pipe, a superheater, a water wall and a plurality of in-furnace hanging pipe panels. The water wall and the plurality of in-furnace hanging pipe panels are in communication. The plurality of in-furnace hanging pipe panels are in communication with the separator through the separator inlet connecting pipe. The separator is in communication with the superheater through the separator outlet connecting pipe. The steam-water double medium discharged by the water wall passes through the plurality of in-furnace hanging pipe panels from bottom to top, enters the separator, and is separated into steam and water in the separator. The steam medium enters the superheater. The application is mainly used as a hanging pipe structure for a deep peak regulation tower type boiler.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal-fired power generation boilers, and particularly relates to a double-medium hanged pipe structure for a deep peak-regulation tower-type boiler. BACKGROUND

[0002] Since the tower-type boiler has certain advantages in the control of heating surface deviation compared with the Π-shaped furnace, with the improvement of unit parameters, more and more efficient ultra-supercritical units adopt the tower-type arrangement. The heating surfaces of the tower-type arrangement are arranged horizontally, and the hanged pipes in the furnace are hanged together from top to bottom. Therefore, the safety of the hanged pipes of the tower-type boiler becomes the focus of the design of the whole boiler.

[0003] The existing hanged pipe structure and process adopt the superheated steam at the outlet of the separator for cooling the medium in the pipe. The function of the separator is to separate the steam-water double medium into steam and water, wherein the steam separated by the separator enters the superheater, and the water separated by the separator reenters the feedwater pipe through the starting circulating pump. When the unit is in wet state operation, the dryness of the steam is small, and the separator is filled with steam-water double medium. The steam separated by the separator enters the hanged pipe, and the amount of the steam is small, which is not the full flow of steam and water, and the cooling capacity of the hanged pipe is weak. The load conditions of the existing unit are in dry state operation, and the wet state condition is basically the starting condition, which is quickly passed in actual operation and has a short time. Although the cooling capacity of the hanged pipe is weak, the time is short, and the safety hazard of the hanged pipe is small.

[0004] With the decrease of the deep peak-regulation load of the unit, the boiler will exist the working condition of long-time wet state operation. Under this working condition, the existing hanged pipe structure causes the sharp reduction of the steam flow for cooling in the pipe, and the cooling capacity of the hanged pipe is seriously insufficient, which has the risk of pipe explosion and shutdown and seriously affects the safe and stable operation of the unit.

[0005] In addition, the existing hanged pipe adopts the flow mode from top to bottom, and a large pipe is connected with the low-temperature superheater outside the furnace, the weight of the large pipe is large, which leads to high cost of the boiler and weak market competitiveness. SUMMARY

[0006] The present application is to solve the problems that the cooling capacity of the existing hanged pipe structure is seriously insufficient under the working condition of long-time wet state operation, there is the risk of pipe explosion and shutdown, and the safe and stable operation of the unit is seriously affected, and the existing hanged pipe adopts the flow mode from top to bottom, which makes the large pipe outside the furnace be connected with the low-temperature superheater, leading to high cost of the boiler, and further provides a double-medium hanged pipe structure for a deep peak-regulation tower-type boiler.

[0007] A dual-medium hanging pipe structure for a deep peak-shaving tower boiler includes a separator, a separator outlet connecting pipe, a separator inlet connecting pipe, a superheater, a water-cooled wall, and a plurality of in-furnace hanging pipe panels. The water-cooled wall and the plurality of in-furnace hanging pipe panels are connected. The plurality of in-furnace hanging pipe panels are connected to the separator via the separator inlet connecting pipe. The separator is connected to the superheater via the separator outlet connecting pipe. The steam-water dual medium discharged from the water-cooled wall passes through the plurality of in-furnace hanging pipe panels from bottom to top and enters the separator. After steam and water are separated in the separator, the steam medium enters the superheater.

[0008] Furthermore, the superheater is a low-temperature superheater;

[0009] Furthermore, a water-cooled wall intermediate header is provided at the inlet end of the water-cooled wall, and the water-cooled wall and the water-cooled wall intermediate header are connected;

[0010] Furthermore, a water-cooled wall outlet header is provided at the outlet end of the water-cooled wall, and the water-cooled wall is connected to the water-cooled wall outlet header;

[0011] Furthermore, a plurality of hanging tube panels in the furnace are arranged in sequence and at equal intervals along the extension direction of the water-cooled wall outlet header;

[0012] Furthermore, each furnace hanging tube panel includes a plurality of furnace hanging tubes, and the plurality of furnace hanging tubes are arranged in sequence and at equal intervals along the extension direction of the water wall outlet header;

[0013] Furthermore, the dual-medium hanging pipe structure further includes a hanging pipe upper header, and the outlet ends of the plurality of hanging pipe panels in the furnace are connected to the separator inlet connecting pipe through the hanging pipe upper header;

[0014] Furthermore, a hanging pipe lower header is provided at the inlet end of each hanging pipe panel in the furnace, and each hanging pipe panel in the furnace is connected to the hanging pipe lower header;

[0015] Furthermore, a suspension pipe is provided between each suspension pipe lower header and the water-cooled wall outlet header, and each suspension pipe lower header is connected to the water-cooled wall outlet header via a suspension pipe.

[0016] The beneficial effects of this application compared to the prior art are as follows:

[0017] 1. The double medium hanging pipe structure for the deep peak shaving tower type boiler provided in the application, compared with the traditional hanging pipe structure, the steam flow process is re-adjusted, the medium at the outlet of the water cooling wall is used for cooling, and the working medium in the hanging pipe flows from bottom to top. When the deep peak shaving tower type boiler is in long time wet state operation, the outlet of the water cooling wall is steam-water double medium, on the one hand, the cooling flow is full flow of steam-water because the working medium in the hanging pipe does not pass through the separator, and the cooling flow is greatly increased compared with the existing structure. On the other hand, the cooling capacity of the steam-water double medium is also greatly improved compared with the existing superheated steam. In this way, the safety of the hanging pipe is ensured, and the whole steam-water flow process is simplified, and the steam-water resistance of the whole system is reduced.

[0018] 2. The double medium hanging pipe structure for the deep peak shaving tower type boiler provided in the application, wherein the water cooling wall outlet header directly enters the hanging pipe and its pipe panel of the lower furnace outlet through the suspension pipe outside the furnace, then flows from bottom to top along the hanging pipe, and finally enters the separator through the hanging pipe upper header arranged at the top of the furnace. The separator enters the low-temperature superheater through the separator outlet pipeline, thereby reducing the weight of the large pipeline outside the furnace. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure diagram of the double medium hanging pipe structure for the deep peak shaving tower type boiler described in the application;

[0020] In the figure, 1 is a separator, 2 is a separator outlet connecting pipe, 3 is a hanging pipe upper header, 4 is an in-furnace hanging pipe, 5 is a hanging pipe lower header, 6 is a separator inlet connecting pipe, 8 is a suspension pipe, 9 is a water cooling wall outlet header, 10 is a superheater, and 11 is a water cooling wall. DETAILED DESCRIPTION

[0021] DETAILED DESCRIPTION Figure 1 In this embodiment, a double medium hanging pipe structure for the deep peak shaving tower type boiler is provided, and the double medium hanging pipe structure comprises a separator 1, a separator outlet connecting pipe 2, a separator inlet connecting pipe 6, a superheater 10, a water cooling wall 11, and a plurality of in-furnace hanging pipe panels. The water cooling wall 11 and the plurality of in-furnace hanging pipe panels are in communication, the plurality of in-furnace hanging pipe panels are in communication with the separator 1 through the separator inlet connecting pipe 6, the separator 1 is in communication with the superheater 10 through the separator outlet connecting pipe 2, the steam-water double medium discharged from the water cooling wall 11 passes through the plurality of in-furnace hanging pipe panels from bottom to top and then enters the separator 1, and the steam medium enters the superheater 10 after steam-water separation in the separator 1.

[0022] The double medium hanging pipe structure for the deep peak regulation tower type boiler provided in the embodiment changes the medium form in the hanging pipe compared with the traditional hanging pipe structure, optimizes the medium form from the traditional steam medium to the steam-water double medium, optimizes the medium flow, and after the optimization, the cooling flow is the steam-water full flow because the working medium in the hanging pipe does not pass through the separator, the cooling flow is greatly increased compared with the existing structure, the cooling capacity of the steam-water double medium is also greatly improved compared with the existing superheated steam, the safety of the hanging pipe is ensured, the whole steam-water flow is simplified, and the steam-water resistance of the whole system is reduced.

[0023] Specific embodiment two: combination Figure 1 The embodiment is explained, and the difference between the embodiment and the specific embodiment one is that the superheater 10 is a low-temperature superheater. The other components and connection modes are the same as those of the specific embodiment one.

[0024] Specific embodiment three: combination Figure 1 The embodiment is explained, and the difference between the embodiment and the specific embodiment two is that the inlet end of the water wall 11 is provided with a water wall intermediate header, and the water wall 11 is in communication with the water wall intermediate header. The other components and connection modes are the same as those of the specific embodiment two.

[0025] Specific embodiment four: combination Figure 1 The embodiment is explained, and the difference between the embodiment and the specific embodiment three is that the outlet end of the water wall 11 is provided with a water wall outlet header 9, and the water wall 11 is in communication with the water wall outlet header 9. The other components and connection modes are the same as those of the specific embodiment three.

[0026] Specific embodiment five: combination Figure 1 The embodiment is explained, and the difference between the embodiment and the specific embodiment four is that a plurality of in-furnace hanging pipe panels are arranged along the extension direction of the water wall outlet header 9. The other components and connection modes are the same as those of the specific embodiment four.

[0027] Specific embodiment six: combination Figure 1 The embodiment is explained, and the difference between the embodiment and the specific embodiment five is that each in-furnace hanging pipe panel includes a plurality of in-furnace hanging pipes 4, and the plurality of in-furnace hanging pipes 4 are arranged along the extension direction of the water wall outlet header 9. The other components and connection modes are the same as those of the specific embodiment five.

[0028] Specific embodiment seven: combination Figure 1The embodiment is described, and the difference between the embodiment and the seventh embodiment is that the double-medium hanging pipe structure further comprises a hanging pipe upper header 3, and the outlet end of each in-furnace hanging pipe panel is connected to the separator inlet connecting pipe 6 through the hanging pipe upper header 3. The other components and connection modes are the same as those in the seventh embodiment.

[0029] The eighth embodiment is described. Figure 1 The embodiment is described, and the difference between the embodiment and the seventh embodiment is that the inlet end of each in-furnace hanging pipe panel is provided with a hanging pipe lower header 5, and each in-furnace hanging pipe panel is connected to the hanging pipe lower header 5. The other components and connection modes are the same as those in the eighth embodiment.

[0030] The ninth embodiment is described. Figure 1 The embodiment is described, and the difference between the embodiment and the eighth embodiment is that a suspension pipe 8 is arranged between each hanging pipe lower header 5 and the water wall outlet header 9, and each hanging pipe lower header 5 is connected to the water wall outlet header 9 through the suspension pipe 8. The other components and connection modes are the same as those in the ninth embodiment.

[0031] In the embodiment, the steam-water double medium directly enters the hanging pipe lower header 5 through the water wall outlet header 9 and the out-furnace suspension pipe 8, which can effectively reduce the weight of the out-furnace large pipe.

[0032] The application has been disclosed in the above preferred embodiments, but is not intended to limit the application, and any person skilled in the art can make some changes or modifications to the above-mentioned disclosed structures and technical contents without departing from the technical solution range of the application to obtain equivalent embodiments with equivalent changes, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the application shall still fall within the technical solution range of the application.

[0033] Working principle

[0034] In the working process of the application, the steam-water double medium first enters the water wall 11 through the water wall intermediate header, and then enters the water wall outlet header 9 in the downward direction. Since the water wall outlet header 9 is connected to the hanging pipe lower header 5 through the suspension pipe 8, the steam-water double medium directly enters the hanging pipe lower header 5 through the water wall outlet header 9 and the suspension pipe 8, and then enters the hanging pipe upper header 3 in the downward direction after passing through the in-furnace hanging pipe 4. The hanging pipe upper header 3 introduces the steam-water double medium into the separator 1 through the separator inlet connecting pipe 6. The steam-water double medium is separated into steam and liquid in the separator 1, and the separated steam enters the superheater 10 through the separator outlet connecting pipe 2, thereby completing the medium process in the application.

[0035] Based on the optimization of the medium form, the hanging pipe structure and the medium flow in the present application, the cooling flow and the cooling capacity under the deep peak-shaving wet operation can be effectively increased, the safety of the hanging pipe is ensured, the whole steam-water flow is simplified, the steam-water resistance of the whole system is reduced, and the structure and the flow developed this time reduce the traditional superheater inlet connecting pipe, that is, the weight of the large pipe outside the furnace is reduced, which is beneficial to saving the manufacturing cost of the structure.

Claims

1. A dual-medium hanging pipe structure for a deep peak-shaving tower boiler, characterized by: The dual-medium hanging pipe structure includes a separator (1), a separator outlet connecting pipe (2), a separator inlet connecting pipe (6), a superheater (10), a water-cooled wall (11) and a plurality of in-furnace hanging pipe panels. The water-cooled wall (11) and the plurality of in-furnace hanging pipe panels are all connected. The plurality of in-furnace hanging pipe panels are all connected to the separator (1) through the separator inlet connecting pipe (6). The separator (1) is connected to the superheater (10) through the separator outlet connecting pipe (2). The steam-water dual medium discharged from the water-cooled wall (11) passes through the plurality of in-furnace hanging pipe panels from bottom to top and enters the separator (1). After steam and water are separated in the separator (1), the steam medium enters the superheater (10). The dual-medium hanging pipe structure further includes a hanging pipe upper header (3), and the outlet ends of the plurality of hanging pipe panels in the furnace are all connected to the separator inlet connecting pipe (6) through the hanging pipe upper header (3); A hanging pipe lower header (5) is provided at the inlet end of each furnace hanging pipe panel, and each furnace hanging pipe panel is connected to the hanging pipe lower header (5); A suspension pipe (8) is provided between each suspension pipe lower header (5) and the water-cooled wall outlet header (9), and each suspension pipe lower header (5) is connected to the water-cooled wall outlet header (9) via a suspension pipe (8).

2. The dual-medium hanging pipe structure for a deep peak-shaving tower boiler according to claim 1, characterized in that: The superheater (10) is a low-temperature superheater.

3. The dual-medium hanging pipe structure for a deep peak-shaving tower boiler according to claim 2, characterized in that: A water-cooled wall intermediate header is provided at the inlet end of the water-cooled wall (11), and the water-cooled wall (11) is connected to the water-cooled wall intermediate header.

4. The dual-medium hanging pipe structure for a deep peak-shaving tower boiler according to claim 3, characterized in that: A water-cooled wall outlet header (9) is provided at the outlet end of the water-cooled wall (11), and the water-cooled wall (11) is connected to the water-cooled wall outlet header (9).

5. The dual-medium hanging pipe structure for a deep peak-shaving tower boiler according to claim 4, characterized in that: A plurality of in-furnace hanging tube panels are arranged in sequence and at equal intervals along the extension direction of the water-cooled wall outlet header (9).

6. The dual-medium hanging pipe structure for a deep peak-shaving tower boiler according to claim 5, characterized in that: Each furnace hanging tube panel includes a plurality of furnace hanging tubes (4), and the plurality of furnace hanging tubes (4) are arranged in sequence and at equal intervals along the extension direction of the water-cooled wall outlet header (9).

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