Method of using ammonia process to remove carbon dioxide from generating plant smoke gas and system thereof

Abstract

The invention relates to a method for removing carbon dioxide from flue gas of power station by employing ammonia process and a system thereof. The method of the invention is that the spray of an ammonia empty tower circulation removes carbon dioxide; the ammonium hydrogen carbonate fell to tower bottom is divided into three paths: the first path is to circulate by means of a primary spray device at the upper part of a deposition pond; the second path is to circulate by means of a secondary spray device at the middle part of the deposition pond; the third path is that pumping the ammonium hydrogen carbonate out from the bottom of the deposition pond to process fertilizer ammonium bicarbonate after rotational flow, centrifugation and drying treatment; the flue gas after being removed carbon dioxide and defogged is emitted into atmosphere. The system comprises the primary spay device, the secondary spray device, a carbon dioxide absorbing tower of the defogging device from top to bottom, wherein, the primary spray device and the secondary spray device are respectively connected with the upper part and the middle of the deposition pond via a primary slurry circulation pump and a secondary circulation pump, and the water inlet of the primary spray device is provided with a ammonia supply device; the bottom of the deposition pond is serially connected with a cyclone separator, a centrifuge and a drier via a fluid thickening circulation pump; the invention is especially suitable for treating flue gas of power station with large flux and low carbon dioxide concentration, in addition, ammonium bicarbonate fertilizer can be obtained.

Description

technical field [0001] The invention relates to a purification treatment technology for flue gas at the tail of a coal-fired power plant boiler, in particular to a method and system for removing carbon dioxide from power plant flue gas by ammonia method. Background technique [0002] Atmospheric greenhouse effect is one of the most important environmental problems faced by human beings. Carbon dioxide is the main greenhouse gas, thermal power plants are the concentrated emission source of carbon dioxide, and its carbon dioxide emission accounts for about 30% of the total carbon dioxide emission caused by human activities. A 600MW thermal power plant can emit up to 500 tons of carbon dioxide per hour. Therefore, in order to reduce the carbon dioxide content in the atmosphere, the most important thing is to reduce the amount of carbon dioxide discharged into the atmosphere by the exhaust gas of the power plant boiler. [0003] At present, the methods for carbon dioxide treat...

AI Technical Summary

Problems solved by technology

Due to the inherent shortcomings of the above ammonia bubbling and filler absorption methods and the particularity of the flue gas at the tail of the power plant boiler, it is difficult to achieve the purpose of effectively removing carbon dioxide from the flue gas

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