Energy-saving system and method for preventing coal economizer from boiling through low-load flue gas diversion

A flue gas diversion and energy-saving system technology, which is applied to steam generation methods, combustion methods, and feedwater heaters using pressure combustion to achieve the effects of improving combustion stability, reducing heat absorption, and reducing ignition heat.

Pending Publication Date: 2021-12-03
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology fails to fully consider the characteristics of deep peak shaving conditions, making the above two factors become the bottleneck for deep peak shaving of units

Method used

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  • Energy-saving system and method for preventing coal economizer from boiling through low-load flue gas diversion

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] see figure 1 , a low-load flue gas diversion prevention economizer boiling energy-saving system provided by the present invention includes a boiler 1, a primary economizer 2, a flue gas regulating baffle 3, a diversion flue 4, and a hot primary air heater 5 , Secondary economizer 6, air preheater 7, hot primary air reheating air passage isolation door 8, hot primary air reheating air passage 9.

[0022] Among them, the split flue 4 is arranged side by side next to the main flue of the primary economizer 2, and the hot primary air reheating air duct 9 is arranged side by side next to the main hot air duct.

[0023] When running at low load, open the baffle plate at the entrance of the diverter flue of the economizer to divert part of the flue gas to enter, reduce the amount of flue gas in the main flue, reduce the heat absorption of the economizer, and...

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Abstract

The invention discloses an energy-saving system and method for preventing coal economizer boiling through low-load flue gas shunting, the energy-saving system comprises a primary coal economizer communicated with a boiler, shunting flues are arranged beside a main flue of the primary coal economizer in parallel, and the shunting flues can bypass part of flue gas to prevent the flue gas from passing through the primary coal economizer. Aiming at the requirement of a drum boiler provided with a graded economizer under the working condition of deep peak regulation, by taking prevention of the economizer from boiling and improvement of the stable combustion capacity of primary air powder airflow as a main starting point, part of flue gas is shunted by utilizing bypass flues arranged in parallel in a primary economizer main flue under the working condition of low load; the amount of flue gas flowing through the economizer is reduced, the heat absorption capacity of supplied water of the economizer is reduced, enthalpy increase of the supplied water in the primary economizer is reduced, and therefore the phenomenon that the supplied water at an outlet of the economizer is not boiled at the low saturation temperature is avoided.

Description

technical field [0001] The invention belongs to the technical field of flexible transformation and deep peak regulation of coal-fired power plants, and in particular relates to an energy-saving system and method for diverting low-load flue gas to prevent economizer boiling. Background technique [0002] At present, most coal-fired units have completed the wide-load denitrification transformation, and the graded economizer technology is one of the main technical routes. For the units that have implemented the graded economizer transformation, the normal operation of denitrification can be realized during deep peak regulation. However, when the subcritical unit is running under low load, the drum pressure decreases with the load, and the corresponding saturation temperature also decreases, which makes the economizer boil risk. At the same time, because the temperature of the hot primary air is relatively low when the load is low, the temperature of the primary air flow at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/22F22D1/36F23C10/00F23C10/18F23J15/06F23K3/02F23L15/00
CPCF22B1/22F22D1/36F23C10/00F23C10/18F23J15/06F23K3/02F23L15/00Y02E20/34
Inventor 王慧青冯斌赵帅查琼亮王昭韩雨龙鹿家麒
Owner XIAN THERMAL POWER RES INST CO LTD
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