A method for putting into operation the external heat exchanger of a supercritical circulating fluidized bed boiler

A technology of external heat exchanger and circulating fluidized bed, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in a molten state, etc., to achieve the effects of promoting development and application, good social benefits, and avoiding operational errors

Active Publication Date: 2019-03-05
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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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: aim at the above existing problems, to provide a method that can effectively avoid and solve the main problems existing in the operation process of the existing external heat exchanger, and correctly guide the operation of the boiler technicians, so as to ensure that the external heat exchanger Operation method of supercritical circulating fluidized bed boiler with external heat exchanger for smooth operation and safe operation of the boiler

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: The external heat exchanger of a 600MW supercritical circulating fluidized bed boiler in Baima, Sichuan was put into operation.

[0027] Baima 600MW supercritical circulating fluidized bed boiler is the first large-capacity supercritical circulating fluidized bed boiler put into operation in China. At the initial stage of operation of the external heat exchanger of the boiler, the furnace bed temperature fluctuated up and down, and the outlet steam of the external heat exchanger appeared. Major problems such as large temperature changes, frequent adjustment of the fluidizing air volume of the external heat exchanger, oscillation of the ash control valve, and unstable ash intake, etc., lead to a long time for the external heat exchanger to be put into operation, or even fail to put into operation, which affects the external heat exchange Safe and stable operation of appliances and boilers. After analyzing and summarizing the reasons, adopting the technical sch...

Embodiment 2

[0028] Example 2: The external heat exchanger of a 660MW supercritical circulating fluidized bed boiler in Pingshuo, Shanxi was put into operation.

[0029] The first 660MW supercritical circulating fluidized bed boiler is the supercritical circulating fluidized bed boiler with the largest capacity in the world that will be put into operation after the domestic 600MW boiler. For the problem that the running time is too long or even fails to be put into operation, the technical solution of the present invention can be adopted, and the successful operation experience of the domestic 600MW boiler external heat exchanger can be used to create good technical conditions for the smooth operation of the boiler external heat exchanger , providing a reliable operating experience.

[0030] The present invention is proposed after analyzing the problems and causes in the operation process of the external heat exchanger according to the commissioning situation of the external heat exchanger...

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PUM

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Abstract

The invention discloses a commissioning method of an external heat exchanger of a supercritical circulating fluidized bed boiler. To solve the existing problems in a conventional external heat exchanger commissioning process, by commissioning the external heat exchanger of the large (super) supercritical circulating fluidized bed boiler, adopting appropriate commissioning time and an appropriate commissioning mode, improving automatic control logic and preventing an ash control valve from vibrating, substantial fluctuation of a hearth bed temperature and an outlet steam temperature of the external heat exchanger is avoided effectively, smooth commissioning and safe operation of the external heat exchanger and the (super) supercritical circulating fluidized bed boiler are ensured, technicalsupport and an operation guide can be provided for subsequent reliable commissioning and running debugging of the external heat exchanger of the (super) supercritical circulating fluidized bed boiler, and the commissioning method has good social benefits.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed boilers, in particular to a method for putting into operation an external heat exchanger of a supercritical circulating fluidized bed boiler. Background technique [0002] With the development of circulating fluidized bed (CFB) boilers towards large-scale and ultra-critical (ultra)critical parameters, the heating surface only arranged in the tail shaft of the furnace can no longer meet the parameter requirements, and part of the heating surface needs to be arranged outside the furnace, that is, outside Displacement Heater. [0003] At present, there are few circulating fluidized bed boilers with external heat exchangers put into operation in China, and only one supercritical circulating fluidized bed boiler with external heat exchangers is put into operation in Sichuan Baima 600MW boiler, which has an external heat exchanger Before it was put into operation, because there was no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/28F23C10/30F23C10/32
CPCF23C10/28F23C10/30F23C10/32
Inventor 郑兴胜周棋郭强周旭刘行磊聂立苏虎周龙龙
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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