Novel heat supply system for gradient utilization of combined heat and power generation heat supply network energy

The invention discloses a novel heat supply system for the gradient utilization of combined heat and power generation heat supply network energy. Primary heat supply network return water is allocatedbetween a heating hot water subsystem and a domestic hot water subsystem through a combined pipeline of an electric regulating valve, a return water pressure pump, a one-way heat metering device, a ball valve and a check valve, so that heat contained in the return water is continuously used for system heat supply; and the gradient utilization of energy is realized, the heat supply capacity of thepipe network can be improved under the condition that an existing pipe network does not need to be subjected to system transformation, so that the situation that an urban heat supply network is insufficient in heat source and conveying capacity is improved, and meanwhile energy conservation, consumption reduction, environment protection and energy utilization efficiency increasing are facilitated. 一种热电联产热网能源梯级利用的新型供热系统，通过电