Energy-saving and environment-friendly liquefied natural gas gasification heating system

An energy-saving and environment-friendly liquefied natural gas gasification heating system is characterized in that an inlet of a first heat exchanger is communicated with a steam pipeline, a pressure reducing valve and a flow regulating valve are arranged on the steam pipeline, and a vacuum breaking valve is arranged at the inlet of the first heat exchanger; the first heat exchanger is sequentially connected with a drain valve set, a condensate water collecting cabinet, a pneumatic diaphragm pump and a cabin hot water collecting cabinet through pipelines, the pneumatic diaphragm pump is communicated with compressed air through a compressed air pipeline, an electromagnetic valve is arranged on the compressed air pipeline, the pneumatic diaphragm pump is provided with a diaphragm pump bypass pipeline, and a stop valve is arranged on the diaphragm pump bypass pipeline. The first heat exchanger is connected with an inlet of the second heat exchanger through a water glycol outlet pipeline, a first temperature se