Cradle to Gate
Identity ID
de70895b-374c-4751-b00a-460eb5564fed
Energy
Associated ID
ffb43e14-9941-4752-80e7-18bdbbe4f460
Included activities starts
Included activities ends
Description
The composition of municipal solid waste treated by municipal solid waste incinerators (MSWI) in Shaanxi are as follows: kitchen waste 38.6%, paper 9.3%, rubber 10.1%, textiles (fibers) 1.4%, wood and bamboo 7.4%, ash and soil 0%, bricks, tiles and ceramics 23.3%, glass 6.5%, metals 3.4%, others 0%. Moisture content is 45.85%, gross calorific value is 5445.04 kJ/kg, and net calorific value is 3802. 42 kJ/kg.
Waste treatment activities are based on an average municipal/public waste mix and are not suitable for single specific waste types such as plastic, paper, cardboard, etc. If your waste is a specific waste mixture, please account for the corresponding waste separately. Each kg of this waste generates 0.205 kg of slag and 0.05 kg of fly ash: after recovery of precious metals from fly ash and slag, they are landfilled, and the fly ash is solidified with cement at a ratio of 1:1.
The average thermal efficiency for waste heat electricity generation is taken as 22%; during the waste heat heating process, no different forms of heat and energy conversion are involved, resulting in higher thermal efficiency, with an average value of 64%. By considering the thermal efficiency of both the waste heat electricity generation process and the direct heating process, 15% of the heat generated from waste incineration is used for electricity generation, and 56% is used for direct heating.
Activity Description
After waste enters the incineration plant, it is first piled and stored, during which leachate is generated due to the high moisture content of the waste. Subsequently, the stored waste is fed into the incinerator for combustion. The flue gas produced during incineration is treated through flue gas purification systems. The resulting solid residues include bottom ash and fly ash, with bottom ash deposited at the bottom of the incinerator and fly ash carried away with the flue gas. The heat generated from incineration is utilized for power generation or heating, achieving resource recovery. The electricity produced from waste heat recovery can be sold externally or reused within the incineration plant.
Process Description
Heat is generated during waste incineration activities and is typically reused within the activity itself.
Time period
2022
2026
Geography
China,Shaanxi
Geography comment
National statistics, literature research
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
In China, 90% of waste-to-energy power plants use mechanical grate incinerators for their furnaces, with waste heat boilers configured in vertical, horizontal, or II-type arrangements, primarily adopting the horizontal layout. These facilities are typically equipped with the following systems: in-furnace denitrification system, semi-dry flue gas desulfurization tower, dry powder injection, activated carbon injection adsorption system, and baghouse dust collector. The in-furnace denitrification systems mainly employ selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) technologies.