CISDI has won the contract to carry out Tangshan Ganglu Steel’s plume removal project.

The task involves removing smoke plumes from the slag granulation processes of six blast furnaces at the steelworks on an EP basis.

The contract sees CISDI enter a new business sector and involves air-cooled tower condensation, smoke injection, exhaustion, and instrumentation systems.

CISDI’s innovative plume removal system carries a Chinese utility patent. It has a beneficial effect on the environment, boosts economies, requires a short process flow and is low cost.

One of its innovative techniques utilises excess heat from local low-temperature exhaust gas to remove the plume - a complex procedure, as re-collecting low temperature exhausts is difficult.

The condensate of plumes can also be recovered, while mixed gas in the chimneys can be kept on track online. The condensation system’s working proportion can be adjusted according to the seasonal and daily changes and the entire unit becomes more energy efficient.

Technological highlights:

Scientific definition on the atmospheric reference for plume removal can be made

Scientific demarcation on the critical region and safe region can be calculated

The optimised configuration on the plume removal system and unit can be found

To achieve these benefits, CISDI’s team carries out studies on the plume’s generation mechanism and smoke composition, temperature and humidity from various sources.

All available exhausts are brought into use, according to their excess heat conditions, as the main means to remove plumes and optimise a cost-competitive configuration on the removal system according to the defined atmospheric reference, divided critical and safe regions and plume and excess heat’s characteristics.

Establishing automatic control

To automate the removal system, CISDI has developed a basic data base and basic model to enable the system to automatically identify the removal’s critical and safe regions, judge the removal results and control the working points within a safe region, and to enable the system to automatically evaluate the cost competitiveness so as to control the OPEX.

China’s environmental control agency called for plume removal in early 2017 as part of its mission to develop a more environment-friendly, innovation-driven and sustainable steel industry.

In response, CISDI has been actively studying the mechanism and theoretical model, selecting targeted plants among over ten enquiries for site survey, technological development and control decision making and verification. CISDI’s plume removal unit is tailored to the actual conditions and has the operational cost under control.

CISDI’s plume removal system features the four main approaching aspects