Analyze the low temperature waste heat power generation technology in detail

At present, all countries in the world attach great importance to the useful use of power, and some developed countries have a power utilization rate of more than 50%, and the power utilization rate has exceeded 60%, while China is only about 30%. An important reason for the low power utilization rate in our country is that the low-temperature waste heat power has not been fully used.

Low-temperature heat sources generally refer to heat sources with a temperature less than 250 ° C but greater than 80 ° C, including industrial process waste heat, solar energy, ocean temperature difference, geothermal, etc. In the industrial field, the general low-temperature residual heat refers to the residual heat, condensate and hot water that occur in the industrial production process below 200℃; The gas below 150℃ and the exhaust gas of boilers and industrial heating furnaces.

Because this part of the waste heat grade is low, the initial investment of the recovery system is large, and the recovery period is long, therefore, the low temperature waste heat resources have not attracted sufficient attention in a long period of time. Low-temperature waste heat power generation is to generate electricity by recovering low-grade heat contained in low-temperature waste gas, steam, hot water, etc. discharged in the production process of steel, cement, petrochemical and other occupations. It is a high-efficiency energy-saving skill to turn waste into treasure.

This skill uses waste heat without directly consuming power, not only does not cause any damage to the environment and pollution, but helps to reduce and reduce the pollution to the environment caused by waste heat directly discharged into the air. Because most of the low-temperature waste heat power generation uses a heat source with a temperature less than 150 ° C, the traditional power generation system with water (steam) as the circulating working medium at this time has low steam pressure, resulting in low power generation power and unable to generate economic benefits.