What We Do

Coke Dry Quenching (CDQ) System

NIPPON STEEL CORPORATION / Nagoya Works / No.5 Coke Oven / CDQ

CDQ is a heat recovery system to cool the hot coke from coke ovens. It is one of the most renowned energy-efficient and environmentally-friendly facilities within steel production.

CDQ is a system where hot coke removed from coke ovens at a temperature of approximately 1,000°C is cooled and kept dry with inert gas and the resulting steam produced in a waste heat recovery boiler is used to generate electricity. As the sensible heat recovered by heat transfer in the cooling chamber is utilized as a heat source for steam generation, electricity generated by CDQ is clean, environmentally-friendly energy. In addition, compared to the conventional wet quenching type, CDQ brings about advantages such as the reduction of dust emissions and improvement of coke quality.

Nippon Steel & NIPPON STEEL ENGINEERING CO., LTD. has developed the world’s largest single-chamber CDQ system, with a capacity of 280 t/h, and we are the one and only supplier capable of providing CDQ systems of various capacities – from 56 t/h to 280 t/h – depending on the needs of each customer.

We have developed a technique to increase the quantity of steam generated using the surplus gas from steel production, and we also offer an automatic operation system that contributes to the stabilization of operations.

In 1976, we constructed the first CDQ plant at the Yawata Works of NIPPON STEEL CORPORATION, with a capacity of 56 t/h. Since then, we have not only recorded a large number of construction achievements, but we have also expanded this technology to other countries, constructing more than 110 CDQ plants all over the world.

We have bases in China and India, Beijing JC Energy & Environment Engineering Co., Ltd. (BJCEEE) and NIPPON STEEL ENGINEERING INDIA Pvt. Ltd.(NSEI), which carry out our business activities and manage our projects.