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Compact parallel connection type external fluidized bed heat exchanger

A technology of fluidized bed heat exchanger and circulating fluidized bed, which is applied to fluidized bed combustion equipment, combustion type, lighting and heating equipment, etc. Solve problems such as temperature fluctuations, achieve the effects of strengthening the heat transfer process, improving heat exchange capacity and heat exchange efficiency, improving the uniformity of returning materials and the fluctuation of bed temperature

Active Publication Date: 2012-12-26
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

[0004] The purpose of the present invention is to overcome the shortcomings of the existing external fluidized bed heat exchangers, to provide a compact parallel external fluidized bed heat exchanger, through the parallel arrangement of two heat exchange chambers, to solve the first The problem of low heat exchange efficiency caused by the low temperature and pressure of the two heat exchange chambers, and at the same time improve the problem of uneven feeding in the large-scale furnace and the fluctuation of bed temperature. Through the compact integrated design, the structure of the large circulating fluidized bed boiler Arrangement and operation adjustment are more flexible

Method used

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  • Compact parallel connection type external fluidized bed heat exchanger
  • Compact parallel connection type external fluidized bed heat exchanger
  • Compact parallel connection type external fluidized bed heat exchanger

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Embodiment 1

[0039] refer to Figure 1 to Figure 3 , a compact parallel external fluidized bed heat exchanger provided by the present invention includes a feed inlet 1 , a material distributor 2 , a heat exchanger 3 , a feed return chamber 4 and a feed return port 6 . The upper end of the feed port 1 is connected to the solid outlet of the cyclone separator, and the lower end is connected to the material distributor 2. The material distributor 2 is divided into a first feeding chamber 25 and a second feeding chamber 26 through a partition 22. The first feeding chamber The feed chamber 25 communicates with the second feed chamber 26 through the through hole at the top of the partition 22, the first feed chamber 25 communicates with the first heat exchange chamber 33 through the through hole 31 at the bottom of the partition 23, and the second feed chamber 26 communicates with the second heat exchange chamber 34 through the through hole 31' at the bottom of the partition 23', and the materia...

Embodiment 2

[0042] refer to Figure 5 to Figure 8 , a compact parallel external fluidized bed heat exchanger provided by the present invention includes a feed inlet 1 , a material distributor 201 , a material conveyor 202 , a heat exchanger 3 , a material return chamber 4 and a material return port 6 . The upper end of the feed port 1 is connected to the solid outlet of the cyclone separator, and the lower end is connected to the material distributor 201. The material distributor 201 is divided into a first feeding chamber 25 and a second feeding chamber 26 through a partition 22. The first feeding chamber The feed chamber 25 communicates with the second feed chamber 26 through the through hole at the top of the partition plate 22, the first feed chamber 25 communicates with the first return passage 27 through the through hole 24 at the top of the partition plate 23, and the second feed chamber 26 The through hole 24' on the top of the partition plate 23' communicates with the second retu...

Embodiment 3

[0045] refer to Figure 9 to Figure 11 , a compact parallel external fluidized bed heat exchanger provided by the present invention includes a feed inlet 1 , a material distributor 2 , a heat exchanger 3 , a feed return chamber 4 and a feed return port 6 . The upper end of the feed port 1 communicates with the solid outlet of the cyclone separator, and the lower end communicates with the material distributor 2. The material distributor 2 is divided into a first feeding chamber 25 and a second feeding chamber 26 through a partition 22. The first feeding chamber 25 communicates with the second feeding chamber 26 through the top through hole of the partition 22, and the material distributor 2 communicates with the return chamber 4 through the upper through hole 21, and the lowest point of the through hole 21 is higher than the upper surface of the partition 22. The heat exchanger 3 includes a first heat exchange chamber 33 and a second heat exchange chamber 34. The first heat exc...

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Abstract

The present invention discloses a compact parallel connection type external fluidized bed heat exchanger, and relates to a fluidized bed heat exchange technology. The compact parallel connection type external fluidized bed heat exchanger comprises a material inlet, a material dispenser, two heat exchange chambers arranged in a parallel connection manner, and a material returning chamber. According to the compact parallel connection type external fluidized bed heat exchanger of the present invention, a pneumatic way is adopted to precisely control the amounts of circulating ash entering the two parallel heat exchange chambers, such that independent adjustments and controls of heat exchange powers of the two heat exchange chambers according to requirements can be achieved; with arrangement of the two heat exchange chambers in the parallel connection manner, heat exchange of the two heat exchange chambers has high heat transfer temperatures and high heat transfer pressures, such that a heat exchange efficiency between high temperature circulating particles and the heat exchange pipe bundles is improved while uniformity of the returned material of the large-size hearth and stability of the bed temperature are improved; and with the compact integration design, structure arrangement and operation adjustment of the large circulating fluidized bed boiler are flexible.

Description

technical field [0001] The invention relates to a fluidized bed heat exchange device, in particular to a compact parallel external fluidized bed heat exchanger for a large circulating fluidized bed boiler. Background technique [0002] With the increase of circulating fluidized bed boiler capacity and steam parameters, the complete arrangement of the evaporation heating surface in the furnace can no longer fully meet the heat absorption requirements of the working fluid, which leads to the layout of the heating surface in the furnace. At present, the effective way to solve the problem of the heating surface layout in the furnace is to arrange an external heat exchanger in the main circulation loop, and transfer the heating surface from the inside of the furnace to the outside of the furnace, which effectively alleviates the wear of the heating surface caused by the high flow rate in the furnace. At the same time, the operation adjustment means of bed temperature and steam te...

Claims

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Application Information

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IPC IPC(8): F23C10/18
Inventor 宋国良孙运凯张缦王小芳王海刚王东宇吕清刚高鸣
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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