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Device and method for realizing deep recovery of boiler flue gas waste heat and air humidification

A technology for the recovery of boiler flue gas and waste heat, which is applied in the types of heat exchangers, climate sustainability, and reduction of greenhouse gases. Effects of water consumption and NOx emission reduction

Pending Publication Date: 2020-05-29
HUANENG CLEAN ENERGY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the existing flue gas recirculation technology, there is a defect that the effect of reducing the amount of thermal NOx generation is not ideal

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  • Device and method for realizing deep recovery of boiler flue gas waste heat and air humidification

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the present invention provides a device for deep recovery of boiler flue gas waste heat and air humidification, including a boiler 1, a heat pump 2, a waste heat recovery tower 3, an upper tower packing layer 4, an upper tower cloth layer 5, an upper tower removal Fogger 6, chimney 7, first valve 8, first water pump 9, first overflow port 10, upper tower liquid storage tank 11, lower tower packing layer 12, lower tower cloth liquid layer 13, second valve 14, the first Two water pumps 15, the second overflow port 16, the lower tower liquid storage pool 17, the air duct demister 18, the first induced draft fan 19, the second induced draft fan 20, the blower fan 21 and the damper 22, wherein, the boiler 1 is provided with The natural gas inlet and the flue gas outlet of the boiler 1 are respectively connected with the first ind...

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Abstract

The invention provides a device and method for realizing deep recovery of boiler flue gas waste heat and air humidification. The exhaust gas temperature is lowered below the water dew point, so that the energy utilization efficiency is improved, and natural gas consumption is lowered. The recovered waste heat can also be used as a heat source for external heat users, so that a significant economicbenefit is achieved. By means of air humidification and flue gas recirculation, the oxygen concentration of combustion-supporting air entering the boiler is lowered; the combustion temperature is lowered; and the aim of lowering the NOx emission concentration is fulfilled. In addition, more heat can be provided for the combustion-supporting air humidification process through the flue gas recirculation, so that the air humidification amount is increased. The exhaust gas temperature is lowered below the water dew point, so that most of water vapor in the flue gas is condensed; the aim of recovering the water vapor in the flue gas can be fulfilled; the water consumption is lowered; and visual pollution of white smoke plume is relieved.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction of thermal power generation, and in particular relates to a device and method for realizing deep recovery of boiler flue gas waste heat and air humidification. Background technique [0002] Natural gas flue gas contains a large amount of water vapor, and the latent heat of vaporization of water vapor accounts for 10% to 11% of the low calorific value of natural gas. At present, the latent heat of natural gas flue gas is basically not utilized and is directly discharged into the environment. In addition, the water vapor in the flue gas is directly discharged into the atmosphere, which not only causes water loss, but also forms a white plume phenomenon, causing landscape pollution. Deep recycling of flue gas waste heat including water vapor condensation latent heat is of great significance to energy saving and pollutant emission reduction. The flue gas waste heat deep utilization...

Claims

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Application Information

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IPC IPC(8): F28C3/08F28F25/02F28F25/08F23J15/04F23J15/06F23N5/00
CPCF28C3/08F28F25/02F28F25/08F23J15/04F23J15/06F23N5/00Y02E20/30
Inventor 周贤彭烁钟迪王保民许世森姚国鹏
Owner HUANENG CLEAN ENERGY RES INST
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