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Supercritical circulating fluidized bed boiler with tail extension heated surface and tail smoke channel

A technology of circulating fluidized bed and tail flue, which is applied in the field of tail flue and supercritical circulating fluidized bed boiler, which can solve the problems of complex furnace structure, increased design difficulty, and complicated boiler operation, so as to reduce manufacturing cost and furnace height lowering effect

Active Publication Date: 2016-07-27
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all complicate the structure of the furnace, increase the difficulty of design, and some also complicate the operation of the boiler.

Method used

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  • Supercritical circulating fluidized bed boiler with tail extension heated surface and tail smoke channel
  • Supercritical circulating fluidized bed boiler with tail extension heated surface and tail smoke channel
  • Supercritical circulating fluidized bed boiler with tail extension heated surface and tail smoke channel

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Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 , figure 2 The supercritical circulating fluidized bed boiler shown includes an air chamber 1, a furnace 2, a cyclone separator 3, a feeder 4, an external heat exchanger 5, a horizontal flue at the outlet of the cyclone separator 6, a water-cooled wall 7, Low-temperature superheater 8, low-temperature reheater 9, economizer 10, air preheater 11, steam-water separator 12. Three cyclone separators 3 are arranged outside the rear wall of the furnace, and the lower parts of the three cyclone separators 3 are respectively connected with three feeders 4 and three external heat exchangers 5 . A medium-temperature superheater 51 is arranged in the left external heat exchanger 5 , a high-temperature superheater 52 is arranged in the middle external heat exchanger 5 , and a high-temperature reheater 53 is arranged in the right external heat exchanger 5 . A water-cooled wall 7 is arranged around the upper part of the tail flue, and a low-temperature superheater...

Embodiment 2

[0029] Such as image 3 As shown, the supercritical circulating fluidized bed boiler consists of an air chamber 1, a furnace 2, a cyclone separator 3, a feeder 4, a horizontal flue at the outlet of the cyclone separator 6, a wall-wrapped water wall 7, a low-temperature superheater 8, and a low-temperature reheater. Heater 9, economizer 10, air preheater 11, steam-water separator 12, etc. The front wall of the furnace is equipped with a high-temperature panel superheater 23 and a high-temperature panel reheater 24. Three cyclone separators 3 are arranged outside the rear wall of the furnace, and three returners 4 are respectively connected to the lower parts of the three cyclone separators 3 . A wall-wrapped water-cooled wall 7 is arranged around the upper part of the tail flue, and a low-temperature superheater 8, a low-temperature reheater 9, an economizer 10, and an air preheater 11 are arranged in sequence from top to bottom in the tail flue, and the low-temperature superhe...

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Abstract

The invention relates to a supercritical circulating fluidized bed boiler with a tail extension heated surface. The supercritical circulating fluidized bed boiler comprises a boiler hearth, a gas-solid separator, material returning devices and the tail smoke channel, wherein a boiler hearth water-cooled wall is arranged in the boiler hearth; an enclosure water-cooled wall is arranged in a high-temperature area of the tail smoke channel; the boiler hearth water-cooled wall is successively connected in series with the enclosure water-cooled wall; the heated area of the boiler hearth water-cooled wall is designed to be characterized in that outlet working medium dryness of the boiler hearth water-cooled wall is greater than or equal to 85% when the boiler is in a 35% load working condition; or the boiler hearth water-cooled wall is connected in parallel with the enclosure water-cooled wall; and the heat area of the boiler hearth water-cooled wall and the heated area of the enclosure water-cooled wall are designed to be characterized in that the outlet working medium dryness of the boiler hearth water-cooled wall and the enclosure water-cooled wall reaches 100% when the boiler is in the 35% load working condition. The invention also relates to a tail smoke channel. The tail smoke channel comprises the enclosure water-cooled wall arranged in the high-temperature area of the tail smoke channel; the enclosure water-cooled wall is suitably connected in series with the back of the boiler hearth water-cooled wall or is suitably connected in parallel with the boiler hearth water-cooled wall.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a supercritical circulating fluidized bed boiler with extended heating surface at the tail and a tail flue with extended heating surface. technical background [0002] Large-scale and high-parameterization are the inevitable trend of the development of circulating fluidized bed boiler technology. With the increase of circulating fluidized bed boiler capacity and the improvement of steam parameters, the heat release volume of the furnace increases faster than the evaporation heating area in the furnace , The unbalanced growth of heat release and heat absorption leads to the layout of the heating surface. Especially for circulating fluidized bed boilers with supercritical parameters, it is necessary to arrange more heating surfaces in the furnace to meet the heat absorption requirements of the working medium. It is very difficult to increase the evaporati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/18F22B31/08
Inventor 宋国良王东宇高鸣孙运凯吕清刚
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI