Cradle to Gate
Identity ID
0f5f51f9-0b20-4a46-bf48-e2cec10d5119
Waste treatment
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 incineration (MSWI) facilities in urban areas of Chongqing are as follows: kitchen waste 72.97%, paper 9.34%, rubber 8.4%, textiles (fibers) 3.16%, wood and bamboo 1.91%, ash and soil 1.48%, bricks, tiles and ceramics 0.92%, glass 1.46%, metals 0.36%, others 0%. Moisture content is 60.44%, higher heating value is 5117.07 kJ/kg, and lower heating value is 3105. 67 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 plastics, paper, cardboard, etc. If your waste is a specific waste mixture, please separately account for the corresponding waste streams. Each kg of this waste generates 0.205 kg of slag and 0.05 kg of fly ash: after precious metal recovery from fly ash and slag, the remaining is landfilled, with fly ash solidified at a 1:1 ratio with cement.
The average thermal efficiency for waste heat electricity generation is taken as 22%. Since no different forms of heat and energy conversion occur during the waste heat district heating process, the thermal efficiency is relatively high, with an average value of 64%. By integrating the thermal efficiencies of both the waste heat electricity generation and direct heating processes, 15% of the heat generated from the waste incineration process is used for electricity generation, and 56% is utilized for direct heating supply.
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
"Municipal solid waste" is primarily generated from a wide range of activities across many different sectors. "Municipal solid waste" includes the following components: kitchen waste, paper, rubber, textiles (fibers), wood and bamboo, ashes and soil, bricks, tiles and ceramics, glass, metals, and potentially other fractions. This by-product (recyclable or waste) arises from common transformation activities and can therefore be considered for modeling waste outputs of similar composition. In the HiQ database, treatment methods for this by-product include: landfilling – sanitary landfill, municipal incineration. Additionally, this by-product is used in the following process: clinker production.
Time period
2022
2026
Geography
China,Chongqing
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.