Waste Heat Recovery Power Plant

F-46 Keywords

X3

factory

Y3

equipment or facility

Z4

electricity

F26

general machinery

Kawasaki Heavy Industries, Ltd.

Waste Heat Recovery Power Plant Features ◆ The waste heat recovery boiler recovers electric energy from the heat energy in the high-temperature waste gas discharged from various plants. ◆ Many cement plants have installed the system because of its excellent energy-saving effect. ◆ The system is being used to recover waste heat not only at cement plants but also at steel-making and non-nonferrous smelting plants.

Waste heat recovery power plant for coke oven (SOL CST in Brazil)

PH boiler AQC boiler

Waste heat recovery power plant for cement plant (Conch Cement in China)

Waste heat recovery power plant for sintering cooler (Wuhan Steel in China)

Basic Concept or Summary PH waste gas

◆ The principle is explained based on a waste heat recovery power plant for cement plants where many systems have been installed.

AQC waste gas

◆ The waste heat recovery power plant for cement plants consists of two waste recovery boilers - a PH boiler and an AQC boiler - both of which are installed in the waste gas line. ◆ The PH boiler recovers waste heat from the pre-heater used for pre-heating raw materials (Boiler inlet gas temperature: 320ºC). ◆ The AQC boiler recovers waste heat from the air quenching cooler that quenches baked clinker (Boiler inlet gas temperature: 320ºC). The heat exchangers using the heat from the two boilers are sequenced to ensure high efficiency.

Waste heat recovery power plant for cement plant

Steam turbine Generator

Condenser Cooler PH boiler

AQC boiler

System diagram of waste heat recovery power plant for cement plant

F-46 Effects or Remarks ◆ Self-developed technology ◆ Cement plants have reduced electric energy used at the entire plant by 30%. ◆ At a standard plant where daily production of clinker is 5,000 tons, 95,000 kW can be saved at the generating end, worth ¥550,000,000 annually (assuming the unit price of electric energy is ¥7.9/kWh). ◆ In terms of CO2 emission, this reduction is equivalent to 540,000 tons, which is significant for the clean development mechanism.

Installation in Practice or Schedule Domestic

◆ Since the first waste heat recovery power plant was delivered to a cement plant (Sumitomo Osaka Cement, Gifu Plant) in 1980, we have supplied about 10 of the 21 plants installed in Japan. ◆ Three waste heat recovery power plants for sintering coolers were delivered to JFE Steel and other companies.

Overseas

◆ Waste heat recovery power plants for cement plants have been delivered to Taiwan, China, India, Vietnam, and Korea since 1990. Especially in China, our plant with a high heat recovery rate has been highly evaluated, and we received a bulk order for 11 plants for the eight cement companies affiliated to Anhui Conch Cement Company Limited, the largest cement maker in China, in March 2005. And our company established a joint venture in January 2007, which is primarily engaged in the design, procurement, and manufacture of waste heat recovery power plants for cement plants. ◆ We delivered a waste heat recovery power plant for a coke plant of American Suncoke, which was constructed in the Arcelor-Mittal-Turbarao Ironworks in Brazil. This is the third largest waste heat recovery power plant in the world, and is designed to recover electric energy from dusty high-temperature waste gas at 1,000ºC or more. It was the largest plant and the first plant to be installed outside of the U.S. The generating capacity is 98 MW x 2 systems.

Contact:

Waste heat recovery power plant for coke oven (SOL CST in Brazil)

Kawasaki Plant Systems, Ltd., Overseas Sales Department, Power Group Tel: 03-3615-6974 Fax: 03-3615-9667 URL: http://www.khi.co.jp/kplant/products/PowerPlant/02.html