Industrial waste heat and solar energy combined cross-season heat accumulation and regional heat supply system

Abstract

The invention discloses an industrial waste heat and solar energy combined cross-season heat accumulation and regional heat supply system, and belongs to the technical field of regional heat supply. The system comprises an industrial waste heat recycling device, a solar heat collector, a ground heat exchanger, a low-temperature hot water heat collecting tail end device, a connecting pipeline, a plurality of sets of circulation pumps and a plurality of sets of valves. The industrial waste heat recycling device is connected with the solar heat collector, the ground heat exchanger and the low-temperature hot water heat collecting tail end device in series or in parallel through the valves, the circulation pumps and the connecting pipeline to form a switchable heat accumulation and heat supply loop. The cross-season heat accumulation manner is adopted in the system, heat in summer is used in winter, and the yearly utilization rate of a solar system and an industrial waste heat system is increased. Meanwhile, the system heat taking and releasing procedure is optimized, the heat of soil is extracted through direct heat exchange in the manner of improving the temperature grade of the underground soil instead of adopting soil balance temperature heat supplementation, and waste of the energy grade due to utilization of a heat pump is avoided.

Description

technical field [0001] The invention belongs to the technical field of district heating, in particular to a cross-season heat storage and district heating system combining industrial waste heat and solar energy. Background technique [0002] District heating refers to the technology of supplying heating and domestic hot water to users in the whole city or in a certain area through the heating pipe network from the concentrated heat source in the city, using steam or hot water as the medium. As a renewable energy source, solar energy is inexhaustible, inexhaustible, clean and pollution-free. If solar energy can be used as the heat source to provide heat to the district heating network, it will bring considerable energy saving and environmental protection benefits. However, the instability, discontinuity and seasonal imbalance of solar energy resources limit the large-scale application of solar energy. Similarly, industrial waste heat has been used in district heating as a r...

AI Technical Summary

Problems solved by technology

However, in the absence of heat supply demand in summer, industrial waste heat cannot be effectively utilized and can only be discharged into the environment through cooling towers, resulting in idle equipment and waste of heat

[0003] Conventional systems that use soil as a heat storage body usually use the method of replenishing heat to the soil's annual equilibrium temperature. The heat storage temperature is low, and the low-grade heat stored in the soil needs to use electricity, high-temperature steam, etc. (such as heat pumps) ) high-grade heat source extraction, which causes waste of energy grade

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