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Circulating fluidized bed boiler with four separators arranged in parallel and arrangement method thereof

A circulating fluidized bed and four-separator technology, which is applied in the directions of fluidized bed combustion equipment, combustion methods, and fuel burned in a molten state, can solve the problem that the structure of the tail flue at the outlet of the separator cannot be symmetrical, and the four circulation loops The problems of uneven gas-solid flow and difficulty in ensuring gas-solid flow uniformity can improve the phenomenon of particle concentration aggregation, facilitate gas-solid separation, and ensure performance.

Pending Publication Date: 2020-11-10
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

(2) Modular design is adopted. This method adopts the mature layout method of small-capacity cyclone separators, and through modular amplification, the gas-solid flow uniformity among multiple cyclone separators in this method is improved due to the significant change in the cross-sectional scale of the furnace. Difficult to guarantee
(4) For ultra-supercritical boilers with larger capacity and higher parameters, such as 1000MW ultra-supercritical circulating fluidized bed boilers, multiple cyclone separators are symmetrically arranged on both sides of the furnace to improve the uniformity of gas-solid flow. The new patent 201620647494.7 discloses a 1000MW class ultra-supercritical parameter circulating fluidized bed boiler. Eight cyclone separators are symmetrically arranged on both sides of the furnace to improve the flow uniformity of the furnace. Although the eight cyclone separators are symmetrically arranged in this method, the The flue structure at the tail of the separator outlet cannot achieve symmetry, and due to the mismatch of multiple flue resistances, it is difficult to ensure the uniformity of gas-solid flow
[0006] (2) When four cyclone separators are arranged side by side on one side of the furnace, due to the increase in the number of cyclone separators and circulation circuits on one side, the gas-solid flow in the four circulation circuits is uneven, resulting in a large deviation between the bed temperature and the steam temperature

Method used

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  • Circulating fluidized bed boiler with four separators arranged in parallel and arrangement method thereof
  • Circulating fluidized bed boiler with four separators arranged in parallel and arrangement method thereof
  • Circulating fluidized bed boiler with four separators arranged in parallel and arrangement method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] like figure 1 As shown, a circulating fluidized bed boiler with four separators arranged side by side, including:

[0048] Furnace, the cross-section of the furnace is octagonal, consisting of a front wall, a rear wall, a left wall, a right wall and four cut-cornea walls. The cross-section of the furnace is axisymmetric about these two center lines; the left wall of the furnace OA, the right wall PQ, the left rear cut angle ON1 and the right rear cut angle PN4, the left front cut angle AX and the right front cut angle YQ are about the front and rear walls of the furnace The center line of the vertical furnace section is axisymmetric;

[0049] Four cyclone separators, including the first cyclone separator C1, the second cyclone separator C2, the third cyclone separator C3 and the fourth cyclone separator C4, are arranged side by side on the furnace rear wall N1N4 in sequence.

[0050] Among them, the four cyclone separators are all composed of inlet flue and cylinder, ...

Embodiment 2

[0065] like figure 2 As shown, a circulating fluidized bed boiler with four separators arranged side by side, including:

[0066] The furnace is composed of four membrane walls, the front wall, the rear wall, the left side wall and the right side wall. Axisymmetric;

[0067] Four cyclone separators, including the first cyclone separator C1', the second cyclone separator C2', the third cyclone separator C3' and the fourth cyclone separator C4', are arranged side by side on the rear wall of the furnace; the four cyclone separators The four cyclone separators are all composed of an inlet flue and a cylinder, and the structure and size of the cylinders of the four cyclone separators are the same; the first cyclone separator C1', the fourth cyclone separator C4', the second cyclone separator C2' It is arranged axisymmetrically with the third cyclone separator C3' with respect to the center line of the front and rear walls of the furnace.

[0068] The outer side walls of the inl...

Embodiment 3

[0081] like image 3 As shown, a circulating fluidized bed boiler with four separators arranged side by side, the difference between this embodiment and embodiment 1 is that the angle β of the outer side wall of the inlet flue of the four cyclone separators is between 90° and 105°; The angle α between the inner side wall of the inlet flue of a cyclone separator is between 60° and 80°; the angle θ between the left wall of the furnace and the left rear chamfered furnace wall is between 120° and 150°;

[0082] And, the positions of the inlet flues of the first cyclone separator C1 and the second cyclone separator C2 satisfy the following relationship:

[0083] M1N2=(1.0~1.5)×M2M3+N2M2 / 2×cotα

[0084] 2×N1O×OA×sinθ+N1X^2×cotα=2×M1N2×(0.8~1.2)×N1X

[0085] Among them, N1O is the distance between N1 and O; OA is the distance between O and A.

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Abstract

The invention discloses a circulating fluidized bed boiler with four separators arranged in parallel. The circulating fluidized bed boiler comprises a hearth and four cyclone separators. The hearth comprises a front wall, a rear wall, a left side wall and a right side wall. The cross section of the hearth is symmetrical about the hearth front-rear wall center line and the hearth left-right side wall center line. Each of the four cyclone separators is composed of an inlet flue and a barrel. The four cyclone separators are arranged on the rear wall of the hearth in parallel. The lengths of intersecting lines of the inlet flues of the four cyclone separators and the rear wall of the hearth are equal. The invention further discloses an arrangement method of the separators in the circulating fluidized bed boiler. The circulating fluidized bed boiler with the four separators arranged in parallel and the arrangement method thereof have the beneficial effects that through the four cyclone separators being arranged on the single side of the boiler in parallel, a hearth of a conventional large circulating fluidized bed boiler is simplified into four circulating loops, the system structure and running operation are simplified, and the uniformity of the circulating loops is improved. Due to the arrangement of the inlet flue of each cyclone separator, the flow distribution of smoke and particles is more uniform, and the consistency of the performance of each cyclone separator is ensured.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed boilers, and in particular relates to a circulating fluidized bed boiler with four separators arranged side by side and an arrangement method thereof. Background technique [0002] The cyclone separator is one of the key components of the circulating fluidized bed boiler. Its main function is to separate a large amount of high-temperature solid materials from the flue gas and send them back to the combustion chamber to ensure efficient combustion and heat transfer in the furnace. With the enlargement and high parameterization of circulating fluidized bed boilers, the diameter and number of cyclones continue to increase. When more than two cyclones are arranged side by side on the same side of the furnace, the gas-solid flow between multiple cyclones This non-uniform gas-solid flow will lead to uneven combustion and heat transfer in the furnace, which will cause uneven temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/18
CPCF23C10/10F23C10/18F23C2206/10
Inventor 宋国良刘志成杨召吕清刚那永洁
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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