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A circulating fluidized bed external heat exchanger to improve the heat transfer uniformity of gas-solid flow

A circulating fluidized bed, external technology, applied in fluidized bed heat exchangers, indirect heat exchangers, heat exchanger types, etc., can solve the problem of uneven gas-solid fluidization of external heat exchangers, and achieve The effect of reducing the cost of consumables, eliminating gas-solid stagnation zones, and improving uniformity

Active Publication Date: 2019-07-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly eliminates thermal deviation by avoiding the side wall area, but the uneven gas-solid fluidization in the external heat exchanger still exists

Method used

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  • A circulating fluidized bed external heat exchanger to improve the heat transfer uniformity of gas-solid flow
  • A circulating fluidized bed external heat exchanger to improve the heat transfer uniformity of gas-solid flow
  • A circulating fluidized bed external heat exchanger to improve the heat transfer uniformity of gas-solid flow

Examples

Experimental program
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Effect test

Embodiment 1

[0028] like figure 1 , figure 2 As shown, a circulating fluidized bed external heat exchanger for improving gas-solid flow and gas-solid heat exchange uniformity described in this embodiment includes a front wall 1, a rear wall 2, a top plate 3, a bottom air distribution plate 4, a left Side wall 5, right side wall 6, air chamber 8 of cooling chamber A, air chamber 9 of mixing chamber, partition wall A 10, mixing chamber 11, cooling chamber A 12, circulating ash inlet 15, circulating ash outlet 16, inlet steam Header A 17, outlet steam header A 18, heating surface tube panel A 19, inlet steam header 23 in partition wall A, outlet steam header 24 in partition wall A, membrane wall 25 in partition wall A.

[0029] The front wall 1, the rear wall 2, the top plate 3, the bottom air distribution plate 4, the left side wall 5, the right side wall 6 and the partition wall A 10 are made of refractory materials. The partition wall A 10 divides the external heat exchanger into a mixi...

Embodiment 2

[0033] like image 3 , Figure 4As shown, the fluidized bed external heat exchanger of this embodiment includes a front wall 1, a rear wall 2, a top plate 3, a bottom air distribution plate 4, a left wall 5, a right wall 6, and an air chamber 7 of the cooling chamber B. , Air chamber 8 of cooling chamber A, air chamber 9 of mixing chamber, partition wall A 10, mixing chamber 11, cooling chamber A 12, partition wall B 13, cooling chamber B 14, circulating ash inlet 15, circulating ash outlet 16, Inlet steam header A 17, outlet steam header A 18, heating surface tube panel A 19, inlet steam header B 20, outlet steam header B 21, heating surface tube panel B 22, inlet steam header in partition wall A Box 23, outlet steam header in partition A 24, membrane wall of partition A 25, inlet steam header in partition B 26, outlet steam header in partition B 27, membrane of partition B Type wall 28, inlet steam header 29 in the right wall, outlet steam header 30 in the right wall, memb...

Embodiment 3

[0039] like Figure 5 , Figure 6 As shown, the fluidized bed external heat exchanger of this embodiment includes a front wall 1, a rear wall 2, a top plate 3, a bottom air distribution plate 4, a left wall 5, a right wall 6, and an air chamber 8 of the cooling chamber A. , Air chamber 9 of mixing bin, partition wall A 10, mixing bin 11, cooling bin A 12, circulating ash inlet 15, circulating ash outlet 16, inlet steam header A 17, outlet steam header A 18, heating surface tube panel A19, inlet steam header 23 in partition wall A, outlet steam header 24 in partition wall A, membrane wall 25 of partition wall A, rear wall steam header I 35, rear wall steam header II 36.

[0040] The front wall 1, rear wall 2, top plate 3, bottom air distribution plate 4, left side wall 5 and right side wall 6 of the external heat exchanger adopt a membrane wall structure, and the diameter of the membrane wall tube is The range is 28-76mm; the membrane walls of the front wall 1 and the rear w...

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Abstract

The invention discloses a circulating fluidized bed external heat exchanger with improved gas-solid flow and gas-solid heat exchange uniformity. The circulating fluidized bed external heat exchanger comprises a front wall (1), a rear wall (2), a top plate (3), a bottom air distribution plate (4), a left wall (5), a right wall (6), a cooling bin A air chamber (8), a mixing bin air chamber (9), a partition wall A (10), a mixing bin (11), a cooling bin A (12), a circulating ash inlet (15), a circulating ash outlet (16), an inlet steam header A (17), an outlet steam header A (18) and a heated surface tube panel A (19). The roughness of the inner wall of the cooling bin A (12) is lower than 100 micrometers, the cooling bin A (12) and the bottom air distribution plate (4) form an angle of 80-90 degrees, so that stagnant areas on the peripheral wall of the cooling bin A (12) are effectively eliminated, gas-solid flow and gas-solid heat exchange uniformity of the external heat exchanger are improved, and heat deviation of a working medium is reduced.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of circulating fluidized bed power generation, and in particular relates to an external heat exchanger for a circulating fluidized bed boiler which improves the uniformity of gas-solid flow and gas-solid heat exchange. [0003] Background technique: [0004] Due to its high combustion efficiency, wide fuel adaptability, and low pollutant emissions, circulating fluidized bed boilers have become the best choice for processing large-scale inferior coal and low calorific value coal after raw coal washing. At present, circulating fluidized bed boilers are developing rapidly in the direction of large-scale, high-parameterization, and super (super) critical. With the continuous increase of boiler capacity and the continuous improvement of environmental protection emission requirements, the installation of external heat exchangers on the external circulation loop of circulating fluidized bed boilers has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D13/00F28D21/00F28F13/18
CPCF28D13/00F28D21/00F28D2021/0024F28F13/18
Inventor 李建波卢啸风王泉海孙思聪许臻郑雄
Owner CHONGQING UNIV
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