Project introduction
Adjacent to Dalingshan Town and Liaobu Town, the urban garbage disposal plant of Dongguan is located at the foot of Shuilian Mountain in Nancheng District and in the highland in the south of the downtown area. The project realized the goal of enhancing the level of reduction, resource utilization and pollution-free treatment of domestic garbage, controlled effectively secondary pollution, had less impact on the environment and enjoyed better environmental effects. The waste-burning power generation technology is adopted and the original site is in Huangcui Village waste landfill site. It is estimated that 3000tons of wastes, also 175,214m2 land area will be disposed per day via three 400t/d circulating fluidized bed (CFB) waste burners and two 15MW condensing turbo-generator sets, with the first stage capable of disposing of 1000tons per day, occupying 83,375m2 land area.

The first stage adopts BOT mode and CFB waste burning power generation system developed by Beijing China Science General Energy and Environment Co. Ltd., so that the heat value of the wastes can be fully utilized and the steam produced be used to compensate the partial costs during the operation stage. The waste disposal capacity will be 1000 to 1200 tons per day and 380,000 tons per year, with the annual power generation being about 226.8million kwh and the annual on-grid electricity up to some 180million kwh. Profits can be reaped during the operation stage (charted business period) and a win-win situation between government and the project company can be ensured.

Characteristics of the project
CFB waste burning power generation system, being the forth generation product developed by BeiJing China Science General Energy and Environment Co. Ltd., boasts the following characteristics:
1. Considering the lower heat value and moisture of the current urban domestic wastes, less evaporating heating surfaces are arranged in the hearth, so as to reduce the heat absorption rate and maintain the designed temperature; in case of insufficient evaporating heating surfaces, convection heating surfaces arranged in the tail flue will be used as substitute.
2. The patent technology external heat exchanger is adopted so as to place the superheater in the staff return device with lower concentration of HCl, Cl2 and etc, avoiding the superheater erosion from high temperature and ensuring the consistency between the material of the superheater and the medium pressure boiler at medium temperature, and therefore reducing the equipment investment and operation costs.
3. Advanced burning technology is adopted: a. Oil is ignited in circulating fluidized boiler bed, improving the ignition rate and reducing the labor intensity; b. Wind is distributed by stages, ensuring the fluidization of wastes at certain speed and facilitating the burning adjustment; c. Self-balanced high pressure wind multi-point staff return technology is used to ensure reliable staff return under the large staff return quantity and wide load variations.
4. The supporting burning system is advanced and reliable. The waste feeding system, coal feeding system, cinder discharging system, and ash circulating system of the boiler adopt sophisticated and steady technology, so as to ensure the normal and stable operation.
5. Effective anti-abrasion technology is adopted. At the initial stage of development, abrasion posed as the chief defect of CFB; while, this problem found its solution upon the upgrading of technology.
6. The updated DCS controlling system is adopted in the boiler, so as to reflect accurately and timely the working condition inside the boiler and to effectively adjust the burning and steam system based on monitoring results.