Integrated system for utilizing residual heat of boiler smoke and removing sulfur

The invention relates to an integrated system for utilizing residual heat of boiler smoke and removing sulfur. A tubular heat exchanger is used as a heat exchange main body of the system and is arranged on a tail flue between a booster fan and a desulfurization absorber, wherein the tubular heat exchanger is connected to a condensed water heating system; sets of nozzles are arranged in the heat exchanger for intermittently washing the inner tube wall of the heat exchanger and the wall of the flue; the processing water from a desulfurization system or limestone size or the mixture of the processing water and the limestone size are used as washing fluid for washing the walls; and the washing fluid is recovered and reused by returning to the desulfurization absorber after gathering on the bottom of the heat exchanger. By using the integrated system provided by the invention, the temperature of the smoke on the tail part of the boiler can be reduced to 50-70DEG C, thereby recovering the residual heat of boiler smoke and increasing the boiler efficiency. Meanwhile, the smoke within the temperature range which enters into the absorber of the desulfurization system on the tail part still meets the requirement of the temperature for desulfurization reaction, and the water consumption for desulfurization is reduced by 50-80%. Without designing a single size preparation and sewage treatment process, the water-saving and energy-saving properties, the anticorrosion property and reuse of the whole system are finally realized.