A new layout structure of the water supply system for the evaporator of a high-parameter waste heat boiler

Abstract

The invention relates to the technical field of waste incineration waste heat boilers, and specifically to a new layout structure of a water supply system for an evaporator of a high-parameter waste heat boiler. The structure can completely eliminate the hidden dangers brought about by the traditional layout of the water supply system, improve the stability of boiler operation, and ensure the overall efficiency of the waste power plant. The lower part of the middle header of the rear wall water-cooled wall is connected to the rear wall water-cooled wall pipe, and the lower header of the water-cooled wall on the horizontal flue side includes a first header section located on one side of the evaporator and a second header section located below the evaporator and serving as a water supply header for the evaporator. The evaporator is connected to the second header section through a pull-down water supply connecting pipe, and the centralized downcomer is located below the second header section. One end of the second header section close to the rear wall water-cooled wall pipe is closed, and the other end is connected to the end of the centralized downcomer. The second header section is provided with a tail side wall water-cooled wall pipe connected to the tail side wall water-cooled wall.

Description

Technical Field

[0001] The invention relates to the technical field of waste incineration waste heat boilers, and in particular to a novel arrangement structure of a water supply system for an evaporator of a high-parameter waste heat boiler. Background Art

[0002] The high-parameter waste heat boiler has eliminated the rear evaporator, which causes the lower header of the water-cooled wall of the tail flue to be lifted up, and cannot form a certain height difference with the evaporator before the high-temperature superheater. Therefore, the evaporator cannot be supplied with water through the connecting pipe between it and the lower header of the water-cooled wall on the side wall of the horizontal flue. An additional evaporator water supply header must be added and connected to the evaporator through the water supply pipe to achieve water supply to the evaporator. The evaporator water supply header is placed under the lower header of the water-cooled wall on the side of the horizontal flue, at a 90° angle to it, and the length direction crosses the entire tail flue from left to right, and is connected to the centralized downcomer on the left and right sides of the tail flue, see Figure 1 As shown. This structure has the following disadvantages:

[0003] 1. Due to space limitations, the header must be fixed to the intermediate header of the rear wall water-cooled wall nearby through a steel plate, which results in additional tensile stress on the tube wall of the intermediate header of the rear wall water-cooled wall. Since the ash hopper at the bottom of the evaporator is also hung on the header through steel, it directly leads to an overload of the intermediate header of the rear wall water-cooled wall, and the stress condition of the header tube wall is poor, which poses certain hidden dangers to the operation of the boiler.

[0004] 2. Due to space limitations and economic reasons, it is impossible to leave enough space between the header and the evaporator in the front and rear directions of the boiler, resulting in the water supply system connecting pipe between the two being too short and too rigid, and the performance of absorbing expansion during boiler operation is poor.

[0005] 3. Adding an evaporator water supply header across the left and right sides of the horizontal flue increases the cost of the waste heat boiler and has poor economic efficiency.

[0006] In summary, one of the structural problems in the current high-parameter waste incineration waste heat boiler project is the layout of the evaporator water supply system. If you are not careful, it will bring great hidden dangers to the operation of the boiler. Summary of the invention

[0007] In order to solve the problem of potential safety hazards in the existing evaporator water supply system, the present invention provides a new layout structure of the evaporator water supply system of a high-parameter garbage waste heat boiler, which can completely eliminate the hidden dangers brought by the traditional water supply system layout, improve the stability of boiler operation, and ensure the overall benefits of the garbage power plant.

[0008] The technical solution is as follows: a new layout structure of a high-parameter garbage waste heat boiler evaporator water supply system, which includes an evaporator, a lower ash hopper, a centralized downcomer, a rear wall water-cooled wall intermediate header, and a horizontal flue side water-cooled wall lower header. The lower part of the rear wall water-cooled wall intermediate header is connected to the rear wall water-cooled wall pipe. It is characterized in that the horizontal flue side water-cooled wall lower header includes a first header section located on one side of the evaporator and a second header section located below the evaporator and serving as an evaporator water supply header. The evaporator is connected to the second header section through a pull-down water supply connecting pipe. The centralized downcomer is located below the second header section. One end of the second header section close to the rear wall water-cooled wall pipe is closed, and the other end is connected to the end of the centralized downcomer. The second header section is provided with a tail side wall water-cooled wall pipe connected to the tail side wall water-cooled wall.

[0009] It is further characterized in that the second header section is arranged as the lower part of the horizontal flue along the front-rear direction of the boiler.

[0010] After adopting the present invention, the evaporator water supply header is still designed as a part of the lower header of the water-cooled wall on the rear horizontal flue side, so it can still be suspended and fixed through the water-cooled wall pipe on the rear side wall, and no longer needs to be fixed on the middle header of the rear wall water-cooled wall, thereby eliminating the adverse stress condition in which the middle header of the rear wall water-cooled wall needs to bear additional tension in addition to the hanging tension of the lower ash hopper, thereby avoiding the hidden dangers of boiler operation. In addition, the evaporator water supply header and the evaporator form a sufficient height difference, so that the pull-down water supply connecting pipe between the two is long enough and has good flexibility, which can fully absorb the expansion generated during boiler operation, eliminating the hidden danger of excessive operating stress between the two, improving the stability of boiler operation, and ensuring the overall efficiency of the waste power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the prior art structure;

[0012] Figure 2 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0013] See Figure 2As shown, a new layout structure of a high-parameter garbage waste heat boiler evaporator water supply system includes an evaporator 1, a lower ash hopper 6, a centralized downcomer 5, a rear wall water-cooled wall intermediate header 3, and a horizontal flue side water-cooled wall lower header. The lower part of the rear wall water-cooled wall intermediate header 3 is connected to the rear wall water-cooled wall pipe 9, and the horizontal flue side water-cooled wall lower header includes a first header section 7 located on one side of the evaporator 1 and a second header section 4 located below the evaporator 1 and serving as an evaporator water supply header. The evaporator 1 is connected to the second header section 4 by pulling down the water supply connecting pipe 2. The centralized downcomer 5 is located below the second header section 4. One end of the second header section 4 close to the rear wall water-cooled wall pipe 9 is closed, and the other end is connected to the end of the centralized downcomer 5 through an elbow. The second header section 4 is provided with a tail side wall water-cooled wall pipe 8 connected to the tail side wall water-cooled wall, which can be directly fixed in a hanging manner.

[0014] The second header section 4 is arranged as the lower part of the horizontal flue along the front-rear direction of the boiler, and is originally a part of the lower header on the horizontal flue side, so no additional header is added, which reduces part of the waste heat boiler cost and has better economy.

[0015] The present invention cuts off the section of the lower header of the water-cooled wall on the horizontal flue side of the tail located at the lower part of the evaporator 1 area, moves it downward, and connects it to the centralized downcomer 5 at the end. The second header section 4 that is cut off and moved downward forms a certain height difference with the evaporator 1, so the header can also serve as the evaporator water supply header, and is connected to the evaporator 1 by pulling down the water supply connecting pipe 2, thereby realizing the water supply of the evaporator.

Claims

1. A new layout structure of the water supply system of the evaporator of a high-parameter waste heat boiler, which includes an evaporator, a lower ash hopper, a centralized downcomer, a rear wall water-cooled wall intermediate header, and a horizontal flue side water-cooled wall lower header. The lower part of the rear wall water-cooled wall intermediate header is connected to the rear wall water-cooled wall pipe, characterized in that: The lower header of the water-cooled wall on the horizontal flue side includes a first header section located on one side of the evaporator and a second header section located below the evaporator and serving as a water supply header for the evaporator. The evaporator is connected to the second header section through a pull-down water supply connecting pipe. The centralized downcomer is located below the second header section. One end of the second header section close to the rear wall water-cooled wall tube is closed, and the other end is connected to the end of the centralized downcomer. The second header section is provided with a tail side wall water-cooled wall tube connected to the tail side wall water-cooled wall.

2. According to claim 1, a new layout structure of a high-parameter garbage waste heat boiler evaporator water supply system is characterized in that: The second header section is arranged as the lower part of the horizontal flue along the front-rear direction of the boiler.

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