Three-circulation three-segment desulfurizing tower for sintered flue gas

Abstract

The invention provides a sintering flue gas ternary cycle three-stage thionizer. The grading absorption is realized by adopting three-stage absorption and strictly controlling the parameters of absorption liquid of each circulation section, thus being capable of guaranteeing that the sintering flue gas has higher SO2 absorptivity, the loss of the ammonia of a system outlet is minimum and ammonium sulfite with higher concentration and hydrogen sulfite ammonium acetate are output, and being beneficial to forming the final product serving as fertilizer to be sold. Finally, the changing waste into valuable of environment treatment is realized by treatment of wastes with processes of wastes against one another, which is line with recycling economy and sustainable development advocated by the nation.

Description

Technical field [0001] The invention relates to a flue gas desulfurization technology, in particular to a desulfurization tower suitable for sintering flue gas desulfurization in iron and steel enterprises. Background technique [0002] With the rapid development of my country’s economy, my country’s energy consumption is also increasing, SO 2 The degree of pollution from acid rain is also increasing, and it has become an important environmental factor restricting the coordinated and stable development of my country's economy. At present, the SO 2 The emission control methods mainly include: (1) Low-sulfur raw material blending method; (2) High chimney dilution emission; (3) Flue gas desulfurization method. Both the low-sulfur raw material blending method and the high stack dilution emission are restricted by energy and policies, and cannot fundamentally solve SO 2 Pollution, and my country’s sulfur dioxide control is a dual control of emission concentration and total emission. T...

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Problems solved by technology

[0004] like figure 1 As shown, the domestic ammonia-ammonium sulfate desulfurization process for sintering flue gas generally adopts a conventional single tower, adopts the self-circulation of the tower bottom solution, and forms three-stage spraying to desulfurize the flue gas. The main technical obstacles are as follows: Under the salt content, the higher the alkalinity of the solution, the higher the SO in the tail gas 2 The lower the equilibrium concentration, but the higher the alkalinity, the higher the equilibrium partial pressure of ammonia on the solution surface, and the greater the loss of ammonia in the tail gas, which affects the utilization rate of ammonia and causes secondary pollution of ammonia

Under acidic conditions, the circulating fluid contains para-SO 2 Ammonium sulfite, which has absorption effect, also contains a large amount of sulfuric acid according to the composition, and sulfuric acid is based on SO 2 There is no absorption capacity, so a large amount of sulfuric acid is involved in empty circulation according to the solution, resulting in a large consumption of circulation pump power, increasing the cost of operation, and affecting the desulfurization effect at the same time, so the removal of SO in flue gas 2 Reducing the loss of ammonia and preventing the formation of ammonia mist aerosol are mutually restrictive

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