Method for recovering sulfur dioxide from flue gas and producing hydroxylamine sulphate and system thereof

The invention discloses a method for recovering sulfur dioxide from flue gas and producing hydroxylamine sulphate and a system thereof. After the flue gas enters into a desulfurizing device, the method comprises the following steps of: NH4HSO3 concentration working procedure, SO2 main absorption working procedure, demisting and ammonia removing working procedure and production working procedure of the hydroxylamine sulphate. The invention utilizes the improved ammonia method desulfurization technology to recover SO2 resource in the flue gas and produce the hydroxylamine sulphate with higher production value, and the hydroxylamine sulphate is very important medicine and pesticide intermediates and has the valve of being 4-6 times higher than that of chemical fertilizer ammonium sulfate, sothat SO2 resource can be maximally recovered, and the aim of 'changing waste into valuable' can be achieved.