Flue gas desulfurization method and device

Abstract

The invention discloses a flue gas desulfurization method. The method is characterized by comprising the following steps of: 1) washing and cooling: washing and cooling the flue gas entering a desulfurization tower; 2) separation: separating the dust-containing solid-liquid mixture obtained in the step 1) into dust, ammonium salt granules and ammonium sulfate-containing aqueous solution; 3) absorption: spraying a desulfurizing agent to the purified flue gas obtained in the step 1), and performing gas-liquid countercurrent contact; 4) demisting: removing dust, mist foam and liquid drops entrained in the gas through a demister; and 5) condensation: delivering the gas from the demister to a condensation device, condensing the gas and discharging the condensed gas. The invention also discloses a desulfurization device for the flue gas desulfurization method. The desulfurization device comprises the condensation device, the desulfurization tower, an oxidation device, a desulfurizing agent supply device and a water supply device. The method provided by the invention purifies the flue gas; the discharged gas contains little water, dust and ammonia; byproducts such as ammonium sulfite, ammonium sulfate and the like can be produced; and equipment cost and operating cost for desorption and hydrolysis of urea waste solution are saved at the same time.

Description

technical field [0001] The invention relates to a flue gas desulfurization method and a device thereof. Background technique [0002] At present, flue gas desulfurization methods at home and abroad are divided into dry method and wet method. The dry method is characterized by simple process, low cost, and does not reduce the temperature of the flue gas, but low efficiency and low utilization rate of desulfurizer; the wet method is characterized by process Complexity, high cost, low flue temperature, high utilization rate of desulfurizer, high efficiency, but strong corrosion, the biggest advantage is the realization of the recycling of sulfur resources, the current ammonia desulfurization technology has many shortcomings and deficiencies, such as: High cost, strong corrosiveness, large amount of water carried out from the system, difficulty in separating fine dust from finished products make operation more difficult, and continuous operation time is shortened, all of which h...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of low efficiency or high corrosion in dry and wet desulfurization in the existing desulfurization technology, as well as the problem of dust separation and high cost in ammonia desulfurization, and replaces the hydrolysis and desorption of urea waste liquid process, saving its fixed cost investment and operating cost investment

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