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Wall enclosure superheater for supercritical circulating fluid bed (CFB) boiler and wall enclosure method

A superheater and supercritical technology, which is used in steam superheating, lighting and heating equipment, steam generation, etc., can solve the problems of high total resistance, high flow resistance, and limited number of pipes in the intermediate partition wall of the wall-clad superheater system. Achieve the effect of controllability, stable water circulation system, and reduced mass flow rate

Pending Publication Date: 2020-12-25
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tail wrapping process is as follows: the superheated steam enters the header on the side wrapping wall through the connecting pipe, goes down to the lower header of the wrapping wall through the side wrapping wall, and then goes up to the header on the front and rear wrapping walls through the front and rear wrapping wall superheaters. Finally, it goes down through the middle partition wall, enters the lower header of the middle partition wall, and then introduces the inlet header of the low-temperature superheater through the connecting pipe; in the two descending processes, due to the limited number of pipes in the side wall and the middle partition wall, two The descending process resistance is higher, so that the total resistance of the whole cladding superheater system is relatively high

Method used

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  • Wall enclosure superheater for supercritical circulating fluid bed (CFB) boiler and wall enclosure method
  • Wall enclosure superheater for supercritical circulating fluid bed (CFB) boiler and wall enclosure method
  • Wall enclosure superheater for supercritical circulating fluid bed (CFB) boiler and wall enclosure method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A wall-enclosed superheater for a supercritical CFB boiler, said wall-enclosed superheater for a supercritical CFB boiler comprising a front wall-enclosed superheater 1, a rear wall-enclosed superheater 2, a side wall-enclosed superheater 3, Intermediate partition wall superheater 4, superheater suspension pipe 5, suspension pipe upper header 6, side wall header 7, wall lower header 8, front and rear wall headers 9, and middle partition wall lower header box 10;

[0022] The superheater suspension pipes are arranged in four rows in the tail flue: the two rows of suspension pipes close to the front and rear wall superheaters are connected in parallel with the side wall to form a group in the wall superheater system Downward loop; two rows of hanging pipes close to the middle partition wall superheater are connected in parallel with the middle partition wall superheater to form another set of downlink loops in the wall-wrapped superheater system; the front and rear wall-w...

Embodiment 2

[0024] According to the wall-enclosed superheater for a supercritical CFB boiler described in Example 1, the two sets of downlinks and one set of uplinks are connected in series through headers to finally form a wall-enclosed superheater system.

Embodiment 3

[0026] A wall-wrapping method for a wall-wrapped superheater of a supercritical CFB boiler, the method includes the following steps: the superheated steam drawn from the steam-cooled separator first enters the upper header of the hanging tube and the side wrap at the top of the tail flue The header on the wall goes down to the lower header of the wall through the side wall and the two-way hanging pipes close to the front and rear walls, and then goes up to the header on the front and rear walls through the superheaters of the front and rear walls (the middle header on the partition wall), and finally, go down through the middle partition wall and two rows of hanging pipes close to the middle partition wall, and enter the lower header of the middle partition wall (the inlet of the low-temperature superheater), and introduce the superheater to the low-temperature superheater to complete The entire process of the superheater in the wall superheater is understood.

[0027] The boi...

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Abstract

The invention discloses a wall enclosure superheater for a supercritical circulating fluid bed (CFB) boiler and a wall enclosure method. The number of side enclosure walls and the number of middle partition wall pipes are limited, so that the resistance of two descending processes is high, and the total resistance of a whole wall enclosure superheater system is high. The wall enclosure superheaterfor the supercritical CFB boiler comprises a front wall enclosure superheater (1), a rear wall enclosure superheater (2), a side wall enclosure superheater (3), a middle partition wall superheater (4), superheater hanging pipes (5), a hanging pipe upper header (6), a side wall enclosure upper header (7), a wall enclosure lower header (8), a front and rear wall enclosure upper header (9) and a middle partition wall lower header (10). The superheater hanging pipes are arranged in the tail flue in four rows: the two rows of hanging pipes close to the front wall enclosure superheater and the rearwall enclosure superheater are connected with the side enclosure walls in parallel to form a group of descending loops in the wall enclosure superheater system; and the two rows of hanging pipes close to the middle partition wall superheater are connected with the middle partition wall superheater in parallel to form the other group of descending loops in the wall enclosure superheater system. The invention discloses the wall enclosure superheater for the supercritical CFB boiler.

Description

Technical field: [0001] The invention relates to a wall-wrapping superheater and a wall-wrapping method for a supercritical CFB boiler. Background technique: [0002] With the increase of the steam pressure of the boiler, the economic efficiency of the power plant will be significantly improved. If the boiler is increased from the ultra-high pressure parameter to the subcritical parameter, the economic efficiency of the power plant will be increased by about 1.7%; if the subcritical parameter is increased to the supercritical parameter, the economic efficiency of the power plant will be increased by about 1.8%. Therefore, high parameters and large scale have become an important direction for the development of circulating fluidized bed boilers, and a 350MW supercritical circulating fluidized bed boiler scheme has been formed. With the further application of the 350MW supercritical circulating fluidized bed boiler scheme in different units, There is room for further optimiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G7/12
CPCF22G7/12
Inventor 夏良伟姜雪胡雪赵翠晶马明华
Owner HARBIN BOILER
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