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System and method for heating primary air and condensation water by using bypass heat

A technology of condensed water and secondary air, applied in the field of coal-fired boilers, can solve the problem of low utilization rate of flue gas heat, and achieve the effects of improving the utilization rate of flue gas heat, convenient operation and simple structure

Pending Publication Date: 2020-01-24
江苏慧峰仁和环保科技有限公司 +1
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Problems solved by technology

Therefore, there is currently no more scientific system and method for heating the cold primary air and condensed water at the same time, and the heat utilization rate of the flue gas is low

Method used

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  • System and method for heating primary air and condensation water by using bypass heat

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 The shown system uses bypass heat to heat primary air and condensed water, including three-chamber air preheater 1, which also includes boiler hot flue gas inlet 7, condensed water heat exchanger 20, low-temperature shell-and-tube primary The air heater 22; the air preheater 1 of the three compartments includes the primary air chamber 2, the secondary air chamber 3, and the flue gas chamber 4, and the three communicate with each other; the primary air chamber 2, the secondary air chamber Chamber 3 and flue gas chamber 4 communicate with each other to reduce the air leakage problem of the three-part air preheater 1; the inlets of the primary air chamber 2 and the secondary air chamber 3 are respectively connected to the cold secondary air through pipelines. The inlet 5 is connected to each other, and the outlet...

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Abstract

The invention discloses a system and a method for heating primary air and condensation water by using bypass heat. The system for heating primary air and condensation water by using bypass heat comprises a tri-sectional air preheater which comprises a primary air cabin, a secondary air cabin and a flue gas cabin communicating to each other. A hot flue gas inlet of a boiler is separately connectedto a hot flue gas main road and a hot flue gas bypass. According to the method for heating primary air and condensation water by using bypass heat, the hot flue gas of the boiler entering into the hotflue gas bypass flows through a baffle door of a bypass flue, a water supplying heat exchanger, a high temperature tube shell type primary air heater, a condensation water heat exchanger and a low temperature tube shell type primary air heater successively to release heat and is converted into bypass cold flue gas, and the bypass cold flue gas flows out through a cold flue gas bypass. The systemand method can be used for heating cold primary and secondary air simultaneously. The condensation water heat exchanger heats the condensation water, so that the utilization ratio of flue gas heat isrelatively high, and the problem that the tri-sectional air preheater is large in resistance is solved.

Description

technical field [0001] The invention relates to a system and method for heating primary air and condensed water, in particular to a system and method for heating primary air and condensed water with bypass heat, and belongs to the technical field of coal-fired boilers. Background technique [0002] The air preheater is one of the important systems of the pulverized coal boiler, which plays the role of reducing the exhaust gas temperature, increasing the temperature of the combustion air, making the fuel easy to ignite, stable combustion and improving combustion efficiency. The air preheater mainly includes three compartments, shell and tube two forms. At present, more than 90% of coal-fired boilers in power stations use three-compartment air preheaters, and the three compartments circulate hot flue gas, primary air, and secondary air respectively. For the three-compartment air preheater, there have been two obvious problems that have not been resolved for a long time: on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/06F23L15/04F28B9/08
CPCF23J15/06F23L15/04F28B9/08Y02E20/34
Inventor 牛天文褚晓亮董帅苗雨旺
Owner 江苏慧峰仁和环保科技有限公司
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