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A system and method for adjusting the air temperature at the inlet of a coal mill by using water supply

A coal mill and water supply technology, applied in the control system, combustion method, supplementary water supply, etc., can solve the problems of inefficient utilization of boilers, inability to improve boiler thermal efficiency, etc. Short length to avoid the effect of inefficient use

Active Publication Date: 2018-07-20
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of these two methods belong to boiler waste heat utilization technology, neither of which can improve the thermal efficiency of the boiler, but only use part of the waste heat of the boiler inefficiently

Method used

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  • A system and method for adjusting the air temperature at the inlet of a coal mill by using water supply

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Embodiment

[0020] Such as figure 1 As shown, this embodiment provides a system for adjusting the air temperature at the inlet of the coal mill by using water supply, including an air preheater 1, a heat exchanger 2, and an economizer 3, wherein the heat exchanger 1 is a surface heat exchange The economizer adopts countercurrent heat exchange. The feedwater inlet of the economizer 3 is respectively connected with the inlet and outlet of the inner pipe of the heat exchanger 2 through two pipelines. The first feedwater regulating valve 4 and the The second feed water adjustment valve 5, the feed water of the economizer 3 enters the economizer after passing through the inner pipe of the heat exchanger 2, the first feed water adjustment valve 4 and the second feed water adjustment valve 5 are used to adjust the feed water entering the heat exchanger 2 water volume. The outlet of the air preheater 1 is connected to the inlet of the coal mill 6 through the heat exchanger 2, wherein the primary...

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Abstract

The invention discloses a system for adjusting the air temperature of an inlet of a coal mill through fed water. The system is mainly used for a utility boiler with the temperature of primary air higher than that of the fed water. The system comprises an air preheater, a heat exchanger and an economizer. An inlet of the economizer communicates with the heat exchanger, and the fed water entering the economizer partly or wholly passes through the heat exchanger and then enters the economizer. A primary air outlet of the air preheater communicates with the inlet of the coal mill through the heat exchanger. The primary air of the outlet of the air preheater enters the coal mill through the heat exchanger. The invention further provides a method for adjusting the air temperature of the inlet of the coal mill through the fed water. Boiler exhaust gas temperature rising caused by cold air temperature adjusting is avoided or relieved, the efficiency of the boiler is effectively improved, low-efficiency utilization of heat of the boiler is avoided, and the economical efficiency of a generator set is also obviously improved; and the air temperature of the coal mill can be rapidly adjusted, the flue gas temperature of an inlet of an SCR denitration reactor of the boiler can be improved in the underload condition, normal input of SCR in the underload condition is facilitated, and it is ensured that a boiler powder manufacturing system can safely run.

Description

technical field [0001] The invention belongs to the technical field of coal mills, and in particular relates to a system and method for adjusting the air temperature at the inlet of coal mills by using water supply. Background technique [0002] During the operation of the coal-fired generating set, the outlet air temperature of the coal mill must be strictly controlled for safety considerations. The hot air comes from the primary air of the boiler air preheater, and the outlet air temperature requirement of the coal mill can only be reached by adding cold air to reduce the temperature. The addition of cold air will cause the air preheater to reduce the same amount of primary air volume, reduce the heat absorption of the air preheater, increase the exhaust gas temperature of the boiler, and reduce the thermal efficiency of the boiler, resulting in poor power generation economy of the unit. According to the calculation of power plant operating data, for a supercritical 600MW...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22D1/36F22D11/06F23L15/00F23K1/00F22B35/00
CPCF22B35/00F22D1/36F22D11/06F23K1/00F23L15/00Y02E20/34
Inventor 周克毅胡引引唐海宁
Owner SOUTHEAST UNIV
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