System for deep cooling and waste heat recovery of smoke gas in boiler

A waste heat recovery system, deep cooling technology, applied in lighting and heating equipment, combustion methods, indirect carbon dioxide emission reduction, etc., can solve the problems of waste heat waste, low operation reliability, long installation work cycle, etc. temperature, improve boiler efficiency, simple and reliable structure

Active Publication Date: 2010-05-19
XI AN JIAOTONG UNIV +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the installation of a gas-gas heat exchanger (GGH) does not bring significant economic benefits, and the waste heat of the flue gas of more than 100 degrees is wasted in vain, and the

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  • System for deep cooling and waste heat recovery of smoke gas in boiler
  • System for deep cooling and waste heat recovery of smoke gas in boiler

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Embodiment Construction

[0021] The structural principle and working principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Referring to the accompanying drawings, a boiler flue gas deep cooling waste heat recovery system includes: a flue gas cryogenic cooler 8 and an air heater 4, and the flue gas cryogenic cooler 8 includes a cold water inlet and a hot water outlet , 1 flue gas inlet and 1 flue gas outlet to realize heat exchange between flue gas and cold water. The inlet flue of the flue gas cryogenic cooler 8 is connected through the outlet flue of the electrostatic precipitator 3 , and the outlet flue of the flue gas cryogenic cooler 8 is connected through the inlet flue of the desulfurization tower 9 . The air heater 4 includes 1 hot water inlet, 1 cold water outlet, 1 cold air inlet, and 1 hot air outlet to realize heat exchange between hot water and cold air. The cold air inlet of the air heater 4 and the blower 5 connected...

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Abstract

The invention relates to a system for deep cooling and waste heat recovery of smoke gas in a boiler with an independent operating system, which comprises a smoke gas deep cooler, an air heater and an independent water circulation system comprising the smoke gas deep cooler and the air heater. The smoke gas of which the dust is removed by an electrostatic dust remover is used for heating the cold water in the smoke gas deep cooler to recover the waste heat of the exhausted smoke, and the hot water at the outlet of the smoke gas deep cooler is transferred to the air heater for preheating the air, thereby increasing the temperature of the combustion-supporting air in the boiler; after the smoke gas passes through the smoke gas deep cooler, the smoke gas is directly introduced into a desulfurizing tower for desulfurization and recovery processing; and finally, the smoke gas is exhausted through a wet chimney. The system of the invention does not need to change the traditional thermodynamic system of the machine unit, and the long-period safe operation of the system can not be influenced in the process of recovering the waste heat of the smoke gas, thereby lowering the temperature of the exhausted smoke, saving the desulfurization water consumption, improving the machine unit efficiency and increasing the machine unit output.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery and utilization, and in particular relates to a waste heat recovery and utilization system for deep cooling of flue gas of power station boilers and industrial boilers. Background technique [0002] Exhaust heat loss is the largest item among various heat losses of boilers, generally ranging from 5% to 12%, accounting for 80% or more of the total heat loss of boilers. In order to recycle the exhaust heat of boilers, the following two forms are mainly adopted for different units: [0003] 1) For traditional coal-fired units that are not equipped with a desulfurization system, the existing technology usually installs a low-pressure economizer between the air preheater and the electrostatic precipitator of the boiler, and uses the waste heat of the flue gas to heat the condensate in the reheating system. After the water absorbs heat, it returns to the low-pressure heater, and then the lo...

Claims

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Application Information

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IPC IPC(8): F23J15/06F23L15/00
CPCY02E20/34
Inventor 赵钦新王云刚姜尚旭王海超张建福张知翔
Owner XI AN JIAOTONG UNIV
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