Low-grade steam heating and using system of waste heat boiler

The utility model provides a low-grade steam heating and using system of a waste heat boiler. The system comprises kiln tail heat recovery boiler SP, a turbine, an intelligent heat exchanger and a condenser. The system is characterized in that the intelligent heat exchanger is arranged between a kiln tail heat recovery boiler II section steam pipeline and a last-stage steam inlet of the turbine, and a steam inlet of the intelligent heat exchanger is communicated with a kiln tail II section steam outlet pipeline. Low-grade hot steam exhausted from a kiln tail is absorbed to heat water of a heating system, and the aims of energy saving and emission reduction are achieved. The water used for heating is heated after the steam enters the tube-type heat exchanger from the pipelines, hot water after being heated is sent to users for heating through a conveying water pump, and water condensed from the steam flows back to the condenser due to communication of the pipelines and the condenser and enters a condensed wate