Clean flue gas circulation system

Abstract

The invention discloses a clean flue gas circulation system consisting of a control system and a circulation flue, wherein the circulation flue is arranged between the outlet end of a draft fan and the inlet end of a desulfuration absorption tower. The clean flue gas circulation system is characterized in that a first airtight baffle door, a throttling device, an air damper and a second airtight baffle door are arranged on the circulation flue in sequence, a gas pressure gear, a gas flowmeter and a gas thermometer are arranged between the second airtight baffle door and the air damper, and the control system receives parameters output by the gas pressure meter, the gas flowmeter and the gas thermometer and outputs a result after comparison and calculation; when the calculation result is equal to or lower than a design threshold value, the two airtight baffle doors are opened manually or automatically or the air damper is adjusted at the same time; and when the calculation result is higher than the design threshold value, the two airtight baffle doors are closed manually or automatically. By using the clean flue gas circulation system provided in the invention, clean flue gas reflux quantity and required pressure drop can be adjusted conveniently, and the normal operation of a boil and a desulfuration system is not influenced during the starting or the stop of the system.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a circulating fluidized bed semi-dry flue gas desulfurization process and clean flue gas reflux technology, in particular to a clean flue gas circulation system. Background technique [0002] In the boiler flue gas desulfurization process technology, the circulating fluidized bed semi-dry flue gas desulfurization process has many advantages: desulfurization efficiency ≥ 90%; no waste water; no acid corrosion, buildings and equipment of the desulfurization device do not need anti-corrosion; surrounding environment Good, so it is widely used by many large and medium-sized thermal power plants and industrial boilers. [0003] However, due to the internal working principle of the circulating fluidized bed semi-dry desulfurization device, the fluidization state in the desulfurization absorption tower is sensitive to the change of the flue gas volume entering the tower...

AI Technical Summary

Problems solved by technology

[0004] Since the currently used net flue gas circulation system is simple to set up, it cannot effectively control the net flue gas return volume, and sometimes it will affect the normal operation of the boiler. Therefore, the net flue gas circulation system is often closed and used, which is useless

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