Low-grade waste heat recovery and application technology

Abstract

The invention discloses a low-grade waste heat recovery and application technology. A special vacuum heat pipe is introduced to the hot source end for collecting waste heat, the vacuum heat pipe extends towards a terminal user in an upward oblique-pulling mode, middle-end heat exchanging towers are built at certain intervals, the vacuum heat pipe at the previous period transmits the heat energy from the hot source end into the liquid in each middle-end heat exchanging tower, another vacuum heat pipe with the same specification material is additionally introduced in the heat exchanging tower toabsorb the heat energy of the liquid after heating, and cascade heat energy transmission is conducted continuously in the same way; and during storing and using of the terminal, the long-distance transmission can be achieved through cascade heat energy exchanging and transmission, the heat energy transmission of each heat pipe is high in speed and less in system energy consumption, a heat transmitting structure of each heat pipe is simple and easy to operate, automatic and continuous operation can be achieved, a screw-rod-type expansion power generator can still obtain higher internal efficiency under lower volume flow conditions, the fuel is not only saved, the secondary utilization rate of the energy is improved, the environmental pollution can also be reduced, and the energy using andconverting efficiency is high.

Description

technical field [0001] The invention relates to the technical fields of low-grade industrial waste heat recovery and utilization, long-distance cascade transmission of low-grade heat energy, heat pipe technology, water source heat pump and screw expander power generation technology, specifically a low-grade waste heat recovery and utilization technology. Background technique [0002] Existing technical solutions: Ground source heat pump technology: Ground source heat pump technology uses the relatively stable characteristics of surface water, groundwater, and rock and soil layers throughout the year to transfer heat from these low-level heat sources to the required supply in winter through heat pump units. In hot places, in summer, the waste heat in the room is transferred to these low-level heat sources to achieve the purpose of cooling. [0003] Shortcomings and deficiencies of prior art solutions: [0004] (1) The thermal energy transmission distance is short, and the un...

AI Technical Summary

Problems solved by technology

[0004] (1) The thermal energy transmission distance is short, and the underground thermal energy can only be extracted nearby

[0005] (2) The scope of use is narrow

[0006] (3) Long-term large-scale pumping of groundwater is likely to cause adverse effects such as surface subsidence and water pollution

If the pipeline leaks, it is very easy to pollute the surrounding soil environment

[0007] (4) Higher economic cost

In the initial investment of the ground source heat pump system, the cost of the underground heat exchanger accounts for a large proportion, and the cost of the underground heat exchanger is relatively high, which is the main reason why the initial investment of the ground source heat pump system is higher than that of other traditional air conditioning and heating systems.

[0008] (5) Higher ecological cost

Especially in the northern region, many winter heating projects revolve around ground-source heat pumps. In winter, the heat from the ground-source rock and soil layer is unrestrainedly developed and absorbed, and in summer, air-conditioning is rarely used for cooling, so heat cannot be fed back to the rock-soil layer. , resulting in a serious imbalance in the heat ratio of the ground source rock and soil in winter and summer. Over time, the temperature of the ground source rock and soil cannot be balanced, and may even lead to ecological imbalance

[0009] (6) The heat source is relatively unstable due to the complex thermophysical properties and hydrological conditions of the underground rock and soil.

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