Device and method for utilizing plastic manufacturing technique waste gas and low temperature exhaust heat to generate electricity

Abstract

The invention discloses a device and a method for utilizing plastic manufacturing technique waste gas and low temperature exhaust heat to generate electricity. Plastic manufacturing technique waste gas enters an evaporator through a pipeline to carry out heat exchange. Hot waste gas which is produced after the heat exchange is carried out on the waste gas enters a material recoverer to be recovered. A high pressure gaseous state power generation medium after absorbing heat enters a double-screw expander, expansion is acted to push the double-screw expander to operate and therefore a generator is driven to generate the electricity. A later discharged low pressure gas-liquid two-phase power generation medium enters a condenser to carry out the heat exchange with cooling water and then becomes a liquid state. The liquid state power generation medium enters a preheater through a high pressure working medium pump to be preheated and then enters the evaporator to be continuous to absorb waste heat of the waste gas, the cooling water discharged from the condenser enters a water cooling tower, and heat of cooling is released for duty-cycle operation. The device is simple in structure, stable in operation, low in cost and high in power generation efficiency, solves the problem of low recovery and use ratio of the plastic manufacturing technique waste gas low temperature exhaust heat and has a certain economic and environmental benefits.

Description

technical field [0001] The invention belongs to the low-temperature waste heat recovery technology, and relates to the waste heat recovery of gaseous substances in the cooling process, in particular to the recovery and utilization of waste heat when cooling the exhausted waste heat gas in the plastic production process. Background technique [0002] In recent years, the recovery and utilization of industrial waste heat has become an increasingly important role in energy conservation and emission reduction. 50% of the heat energy used by human beings is finally discharged directly in the form of low-grade waste heat. Industrial waste heat is generally divided into high-temperature waste heat above 400°C, medium-temperature waste heat between 400°C-150°C and low-temperature waste heat below 150°C. In recent years, the high-temperature waste heat and medium-temperature waste heat power generation technologies used to recover flue gas have been widely promoted, and have achieve...

AI Technical Summary

Problems solved by technology

When using this device to treat exhaust gas, a large amount of low-temperature waste heat is released during the cooling process, but it cannot be effectively utilized and all of it is discharged into the environment

This process not only wastes a lot of energy, but also greatly pollutes the environment.

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