Boiler tail portion smoke heat energy recovery and low-temperature sulfur removal device and method

Abstract

The invention relates to a boiler tail portion smoke heat energy recovery and low-temperature sulfur removal device and method. The boiler tail portion smoke heat energy recovery and low-temperature sulfur removal device comprises a boiler tail portion flue, wherein a partition valve is arranged in the flue and divides the flue into a waste smoke entering section flue and a waste smoke exhausting section flue. A heat exchanger is arranged above the flue and is provided with multiple heat exchange pipes arranged in the vertical direction, the heat exchange pipes are respectively located above the waste smoke entering section flue and the waste smoke exhausting section flue, and a liquid recovery groove is formed in the lower portion of the flue. Boiler waste smoke is led into the waste smoke entering section flue through an induced draft fan, and waste smoke is discharged through the waste smoke exhausting section flue through the heat exchanger. Sulfur dioxide in the waste smoke is subjected to cold condensation in the heat exchange pipes to form water drops, and the water drops fall into the liquid recovery groove formed in the lower portion of the flue to achieve recovery of sulfur dioxide and other impurities.

Description

technical field [0001] The invention relates to a device and method for heat energy recovery and low-temperature desulfurization of flue gas at the tail of a boiler. Background technique [0002] Boilers are production equipment widely used in factories, enterprises and society, such as boilers for power generation in thermal power plants, boilers for generating steam and heat in factories, heating boilers for heating people's lives, etc. These boilers all have a common problem, that is, the national boiler design code stipulates that the exhaust gas temperature of the boiler is 150°C-160°C. For each ton of the boiler, about 3,500 cubic meters of waste heat above 150°C must be discharged into the atmosphere per hour, that is, the flue gas generated when the fuel in the boiler is burned. The heat energy contained in the flue gas enters the atmosphere with the discharge of the flue gas, resulting in a waste of energy, and the flue gas also contains a certain amount of sulfur ...

AI Technical Summary

Problems solved by technology

[0003] The existing solution is to transform the boiler, use calcium carbonate desulfurization method to separate the sulfur dioxide discharged from the boiler, and then recover it, but the heat energy discharged from the boiler cannot be recovered and utilized, and the method of recovering sulfur requires large investment and high cost

heavy burden on the business

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