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Part control phase change air preheating system and air preheating method

A technology of air preheating and air preheater, which is applied in the field of boiler air preheating, can solve the coupling problems of low temperature corrosion and thermal efficiency, achieve the coupling problem of low temperature corrosion and thermal efficiency, improve the adjustment ability, improve safety and adaptive effect

Inactive Publication Date: 2013-05-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the deficiencies of the existing air preheating system, the present invention proposes a split-controlled phase change air preheating system and an air preheating method. Through the hierarchical air preheating method, the low-temperature corrosion of the traditional air preheater and the Thermal Efficiency Coupling Problem

Method used

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  • Part control phase change air preheating system and air preheating method

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Effect test

Embodiment 1

[0081] A sub-controlled phase change air preheating system, the system includes an air channel 7, a non-phase change air preheater 8 and a flue gas channel 9; the air in the air channel 7 and the flue gas in the flue gas channel 9 Heat exchange is performed in the non-phase-change air preheater 8; the system also includes a flue gas heat exchanger and an air heater; the flue gas heat exchanger is located after the non-phase-change air preheater 8 according to the flue gas flow direction on the flue gas passage 9; the air heater is located on the air passage 7 before the non-phase-change air preheater 8 according to the air flow direction; the steam outlet of the flue gas heat exchanger is supplied with steam through the flue gas heat exchanger The pipe is connected with the steam inlet of the air heater; the condensed water outlet of the air heater is connected with the water inlet of the flue gas heat exchanger through the condensed water pipe of the air heater. The steam sup...

Embodiment 2

[0086] A sub-controlled phase change air preheating system, the system includes an air channel 7, a non-phase change air preheater 8 and a flue gas channel 9; the air in the air channel 7 and the flue gas in the flue gas channel 9 Heat exchange is performed in the non-phase-change air preheater 8; the system also includes a flue gas heat exchanger and an air heater; the flue gas heat exchanger is located after the non-phase-change air preheater 8 according to the flue gas flow direction on the flue gas passage 9; the air heater is located on the air passage 7 before the non-phase-change air preheater 8 according to the air flow direction; the steam outlet of the flue gas heat exchanger is supplied with steam through the flue gas heat exchanger The pipe is connected with the steam inlet of the air heater; the condensed water outlet of the air heater is connected with the water inlet of the flue gas heat exchanger through the condensed water pipe of the air heater.

[0087] The ...

Embodiment 3

[0105] A sub-controlled phase change air preheating system, the system includes an air channel 7, a non-phase change air preheater 8 and a flue gas channel 9; the air in the air channel 7 and the flue gas in the flue gas channel 9 Heat exchange takes place in the non-phase change air preheater 8 . The system also includes a flue gas heat exchanger and an air heater; the flue gas heat exchanger is located on the flue gas channel 9 behind the non-phase-change air preheater 8 according to the flue gas flow; It flows to the air channel 7 before the non-phase-change air preheater 8 .

[0106] The flue gas heat exchanger is divided into high-temperature flue gas heat exchanger 21 and low-temperature flue gas heat exchanger 22 according to the flue gas flow direction; the air heater is divided into high-temperature air heater 2 and low-temperature air heating Device 1. The steam outlets of the high-temperature flue gas heat exchanger 21 and the low-temperature flue gas heat exchang...

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Abstract

The invention relates to a part control phase change air preheating system and an air preheating method. The part control phase change air preheating system and the air preheating method well solve the coupling problem of traditional air preheater low temperature corrosion and heat efficiency, an operating method of the air preheating system can be timely adjusted according to actual operation parameters, adjusting capability is greatly increased, and not only is economy and high efficiency of a thermal circulation system guaranteed, but also security and adaptability of the air preheating system can be improved.

Description

technical field [0001] The invention belongs to the technical field of heat recovery and utilization of boiler flue gas and production process tail gas, in particular to the technical field of boiler air preheating, and specifically relates to a separate control phase change air preheating system and an air preheating method. Background technique [0002] Traditional air preheaters always have the coupling problem of low temperature corrosion and thermal efficiency. Transferring more flue gas heat to the air can improve the thermal efficiency of the system, but lowering the exhaust gas temperature makes it easier to cause low-temperature corrosion on the heat transfer surface, and at the same time cause serious ash plugging, which in turn reduces the heat transfer efficiency. If the exhaust gas temperature is increased, although the harm of low-temperature corrosion can be reduced, the thermal efficiency of the system will decrease. [0003] At present, there are two main a...

Claims

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Application Information

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IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 郝江平李静海刘新华闫润生梁世强
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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