Dual alkali desulphurization energy-saving technique

Abstract

A dual-alkali desulphurization energy-saving technique is characterized in that the technique comprises the following steps: flue gas introduced out by a tunnel kiln hood is sent to an air heat exchange system and carries out heat exchange with cold air entering the air heat exchange system from outside; the heated cold air enters a gas generator through a connecting pipeline and is used as an oxidant; the cooled flue gas enters a desulphurization tower through the connecting pipeline and carries out atomization with alkali liquid sprayed from the top of the tower on a swirling plate to facilitate SO2 in the flue gas to be absorbed and react with the sprayed alkali liquid fully; the purified flue which is subjected to desulphurization and washing is discharged into atmosphere after the detection of sulfur dioxide on-line detection system, loop slurry discharged from the desulphurization tower is sent to a regenerative reactor provided with a stirring device, reacts with added slaked lime fully and then is sent to a precipitation tank for precipitation, supernatant liquid obtained by precipitation overflows into a desulphurization liquid tank and undergoes circular desulphurization after addition of alkali, and the precipitated calcium sulfite, calcium sulfate and calcium carbonate are removed regularly.

Description

technical field [0001] The invention relates to a double-alkali desulfurization and energy-saving process, in particular to a desulfurization and energy-saving process in the production process of refractory materials. This process is mainly used in refractory material production enterprises, and is also widely used in metallurgical fields such as coking, ceramics, carbon, lead smelting, zinc smelting, and copper smelting. Background technique [0002] In refractory material production enterprises, the sulfur dioxide in the tunnel kiln flue gas is removed by the double alkali desulfurization process. The double-alkali method is a kind of wet desulfurization process. The principle is to use soluble sodium-alkali liquid as an absorbent to absorb the SO discharged from the kiln. 2 , and then use calcium alkali to regenerate the absorption solution, because in SO 2 In the absorption and regeneration of the absorption liquid, different types of alkali are used, so it is called ...

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Problems solved by technology

[0003] However, the double alkali desulfurization process still has the disadvantage that NaSO 3 Oxidation by-reaction product Na 2 SO 4 Difficult to regenerate, need to constantly replenish NaOH or Na 2 CO 3 However, increasing the consumption of alkali also has the disadvantage of high operating costs; in addition, the waste heat of high-temperature flue gas is not fully utilized, which wastes energy and is not conducive to the effective desulfurization reaction. There is also a lack of online detection system for sulfur dioxide

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