Waste plastic energy recovery

The energy recovery of waste plastics refers to the process of burning municipal solid wastes and industrial wastes, especially the waste plastics that are burned to obtain high heat energy and use them effectively. Incineration of waste can reduce its mass by 80% and its volume by more than 90%, making combustible waste an inert residue and then landfill. The heat generated by the combustion of waste can be comprehensively utilized. This energy recovery of waste plastics is also referred to as the fourth-level recovery, and is particularly suitable for the treatment of serious pollution and mixed species. Urban solid waste containing more impurities. In many countries that pay attention to environmental protection, waste filling is forbidden. Because of its advanced equipment and technology for energy recovery, high combustion efficiency, and better control of discharged pollutants, it has reached a level of large-scale commercial applications and has become an important recovery. method.

The value of untreated municipal solid waste is 9295. 2 ~ 13942 · 8kJ/kg (The thermal value of industrial coal is about 28000kJ/kg), while the pure calorific value of waste plastic is 2 to 4 times that of the former. The following are the main ways to recycle heat of combustion:

1 The use of steam generating incinerators to burn municipal waste, the heat generated can be used for household heating, industrial processing or power generation;

2 Burn garbage in heat exchangers of existing power plant boilers for use as supplementary fuels;

3 The municipal waste is heated and oxidized under a certain pressure, converted into heavy oil, and produces carbon monoxide and steam;

4 Urban wastes are pyrolyzed to produce transportable fuel;

5 The organic components in the waste are decomposed under anaerobic conditions to produce methane, which can be used as an alternative to natural gas.