scope of application

Environmental governance, solid waste treatment, power generation industry

Technology provider

Everbright Environmental Protection (China) Co., Ltd

Brief description of technology

The combustion of domestic waste produces high-temperature flue gas that heats the water in the water wall tubes, and the water is transformed into superheated steam, which drives the steam turbine to drive the generator to operate and generate electricity. The incineration grate adopts "multi-stage reciprocating forward pushing + turning" mechanical grate furnace equipment. The average daily value of the flue gas after being treated through the "SNCR+ semi-dry + dry + activated carbon adsorption + bag dust removal" combined process reaches the EU 2010 emission standard. The leachate treatment system adopts the process of "pretreatment + high-efficiency anaerobic IOC+ aerobic A/O+ ultrafiltration + chemical softening + microfiltration + reverse osmosis". The produced water is reused in the plant.

technical information

A 400t/d incinerator, a set of waste heat boiler with a rated evaporation capacity of 35.7 t and a rated pressure of 4.0 MPA, and a 7.5MW turbo-generator set.

Commercial applications

Everbright Environmental Protection Energy (Can Tho) Co., Ltd.(hereinafter referred to as the "Can Tho Project") is a wholly foreign-owned enterprise invested by China Everbright Environment (Group) Co., Ltd. in Vietnam. Its main scope is to invest, build, manage and operate domestic waste incineration power plants, and carry out power production and operation activities through incineration and processing of domestic waste. The project was signed and obtained an investment license on December 20, 2016. Construction started on June 30, 2017, and was completed and put into operation on November 26, 2018. Can Tho Project is the first modern domestic waste power generation project put into operation in Vietnam, the first project completed in countries along the "Belt and Road", and the first overseas project constructed in EPC mode. The design scale of the project is a 400-ton daily domestic waste incinerator and a 7.5MW steam turbine generator set. The completion and operation of the project has received high attention from domestic media and Vietnamese media, and has been widely praised.

Help/support you hope to receive during the technology transfer process

1. Policy support 2. Financial subsidies

equipment investment

The Can Tho project is a Foreign Direct Investment model. The project has a business period of 22 years (including a 2-year construction period). It is equipped with an incinerator that processes 400 tons of domestic waste per day and a 7.5MW steam turbine generator unit, with a total investment of more than 47 million US dollars.

Annual operation and maintenance fee

During normal operation of the system, the cost per unit product is the garbage disposal fee per ton, which is about 150-210 yuan/ton, including raw material fees (Environmentally friendly materials such as limestone, ammonia water, chelating agents, activated carbon, and pharmaceuticals), water, electricity, spare parts, production safety, environmental protection, as well as labor costs (wages), depreciation of plants and machinery and equipment, repairs, management fees and other maintenance expenses, of which the relatively large account for raw material costs, labor costs (wages), equipment depreciation, and repair costs.

investment recovery period

The designed scale of the Can Tho project is an incinerator that treats domestic waste of 400 tons per day and a 7.5MW steam turbine generator unit. The total investment of the project is more than 47 million US dollars. Taking the operating situation in 2020 as an example, the total annual revenue of the project is approximately more than 50 million yuan, operating costs and controllable expenses are approximately more than 18 million yuan, and the profit before interest, tax, depreciation and amortization is approximately 32 million yuan. With the continuous increase in operating income and the continuous decrease in costs and expenses during the operation period, Net profit for each year during the operating period has generally maintained an upward trend, and total investment recovery is expected to be achieved within 12 years.

added benefit

Domestic waste incineration power generation technology used to be domestic waste sanitary landfill technology. After applying domestic waste incineration technology, the biggest additional economic benefit is increased power generation revenue. The average electricity per ton of garbage is 280-320 kilowatt-hours. Based on the daily average of domestic waste entering the plant of the Can Tho project, it can generate more than 50 million kilowatt-hours of electricity throughout the year.

comprehensive benefits

The Can Tho project processes 500 tons of domestic garbage per day, accounting for about 75% of the total daily garbage cleared and transported in Can Tho City. It basically solves the environmental pollution problem caused by the original landfill treatment method of local domestic garbage. Through waste incineration, smoke, leachate and fly ash have been environmentally friendly disposal, achieving harmless treatment of domestic waste; the proportion of fly ash after garbage incineration does not exceed 3%, saving a large amount of land resources and realizing the reduction of domestic waste; Through waste incineration and power generation, it provides more than 50 million kilowatt-hours of green electricity every year, which can be used by more than 8000 households for one year, equivalent to saving 25,000 tons of standard coal and reducing carbon dioxide emissions by 63,000 tons per year. At the same time, the slag after waste incineration can be used as a subgrade building material, realizing the resource utilization of domestic waste. In terms of social benefits, it has basically solved many problems caused by the open-air dumping of domestic garbage in the city, which is of great significance to reducing garbage pollution and improving people's living environment. The project recruits from local colleges and universities and from around enterprises, which has boosted local employment. Nearly 200 people.

Level of impact of obstacles on technology transfer

Local residents have low economic affordability and poor infrastructure conditions

technology maturity

Everbright Environment's domestic waste treatment project ranks first in China and the global market in both its operation scale and overall design scale. Domestic waste incineration power generation technology has been successfully applied and promoted in the China market for many years. Everbright Environment's independently developed incineration grate furnace adopts the "multi-stage reciprocating forward push + flip" process, has obtained EU CE product certification, and has the qualification to export to EU countries. Boiler incineration adopts ACC automatic combustion control technology. The average daily value of flue gas treated by the combined process of "SNCR+ semi-dry + dry + activated carbon adsorption + bag dust removal" reaches the EU 2010 emission standard. The leachate treatment system adopts the "pretreatment + high-efficiency anaerobic IOC+ aerobic A/O+ ultrafiltration + chemical softening + microfiltration + reverse osmosis" process. The produced water is reused in the plant. The membrane treatment equipment adopts integrated modular design.

technical applicability

Everbright Environmental Domestic Waste Incineration Power Generation Technology is suitable for the field of environmentally friendly disposal of municipal domestic waste. This technology is suitable for the characteristics of domestic waste in all cities. For example, the incineration grate is particularly suitable for treating "high moisture, high ash, and low calorific value" domestic waste, and is not affected by region, climate, environment, and resources. The upstream source is urban residents 'domestic waste, and the downstream is the local power supply department.

technical stability

This technology is not affected by environmental factors such as temperature, rainy season and dry season. Short-term fluctuations in the scale of domestic waste entering the plant can be guaranteed through operation adjustment. Environmental protection indicators of flue gas, leachate, fly ash, and slag continue to be stable. The overall equipment operation is reliable and stable, and the annual operating time of the unit is ≥8000 hours.

technical safety

This technology mainly treats daily domestic garbage and there are no highly toxic and easily leaked substances. During the design stage, the project fully considers the current strictest environmental emission standards and safety standards. During the production and operation stage, flue gas indicators including dioxins are burned. Adjustment and release of environmental protection materials can be fully guaranteed. Safety can also be effectively guaranteed through hardware investment and standardized operation management. The entire technology will not be limited by upstream resources and imperfect supporting facilities. Affected by systemic risk factors such as low market acceptance.

Barriers to technology transfer and promotion

Local residents have low economic affordability and poor local infrastructure conditions

intellectual property transfer

This technology has obtained nearly a thousand domestic technology patents, and China Everbright Environment Group is all the patentee. The localization degree of key links, processes and equipment of this technology can reach 99%, and the technology property rights transfer mechanism and policy channels are smooth.