Zero-power-consumption self-adaptive distributed waste heat recovery and utilization system for ethylene device

A zero-power-consumption self-adaptive distributed waste heat recovery and utilization system for an ethylene device, comprising:

• a waste heat collection pipeline system, a plurality of waste heat recovery devices arranged in groups, and a waste heat return pipeline system, wherein
• the waste heat collection pipeline system is configured to lead out a working medium having waste heat from a waste heat source of the ethylene device and distribute the working medium to the plurality of waste heat recovery devices, the plurality of waste heat recovery devices are configured to heat combustion-supporting air of a bottom burner of an ethylene cracking furnace through the waste heat, and the waste heat return pipeline system is configured to transport the working medium that has undergone waste heat recovery and utilization back to the waste heat source;
• and
• the waste heat collection pipeline system is provided with flow control elements in stages, and flow rates in pipelines are distributed differentially through the flow control elements to allow flow rates in the groups of waste heat recovery devices to be distributed evenly;
• the plurality of waste heat recovery devices are arranged in groups, each of the groups comprises at least two waste heat recovery devices, and the plurality of waste heat recovery devices are connected in parallel and operate independently;
• the waste heat collection pipeline system comprises a collection master pipe, collection main pipes and collection branch pipes;
• the waste heat return pipeline system comprises a return master pipe, return main pipes and return branch pipes;
• the collection master pipe is configured to lead out the working medium having waste heat from the waste heat source, the working medium is transported to the groups of waste heat recovery devices through the collection main pipes, and is further transported to each of the waste heat recovery devices in a group through corresponding ones of the collection branch pipes;
• the working medium that has undergone waste heat recovery and utilization by each of the waste heat recovery devices in the group is returned, through corresponding ones of the return branch pipes, to a corresponding one of the return main pipes corresponding to the waste heat recovery devices in the group, and further returned to the waste heat source through the return master pipe;
• and
• the collection master pipe is provided with a master pipe flow control element, each of the collection main pipes is provided with a main pipe flow control element, and each of the collection branch pipes is provided with a branch pipe flow control element.