Air Pollution Control

Flue GAS Cleaning System

The system consists essentially of the following major components:

 Flue Gas System inlet Duct

 Reactor and Product Recirculation System

 Bag House Filter

 Sorbent Handling System

 End Product Handling System

 Process Water System

 Auxiliary Systems (Compressed Air System, Nitrogen Inserting System)

 Flue Gas Treatment

Pollution from WtE projects remain a area of high concern both for the regulators and society at large. There is high level of dissatisfaction with the current status of waste management in India. At the same time, there are also apprehensions about likely environmental fall out from the better alternative of WtE projects. Combustion based projects are considered one of the most environment friendly technology provided due care is taken for control of air pollution. Air pollution control technology has been developed to take care of all concerns through elaborate arrangement of multi stage treatment and control and monitoring system.

Provisions are made in the design of the combustion system of boilers to minimize the level of pollutants present in the flue gas coming out of the boiler. Further treatment is required to bring the levels below the prescribed values as per SWM Rules and CPCB norms. Since norms become stringent over a period of time, care is to be taken to select treatment section so that future requirements are also met without much modification.

The flue gas treatment system consisting of lime and activated carbon injection system, quenching chamber and reaction tower followed by bag filters ensure total compliance with the most stringent regulation anywhere in the world. Process control for the flue gas treatment facility consists of three loops, in which the first loop continuously controls the flow of re-circulated absorbent to the reactor by continuously monitoring the quantity of flue gas.

The second loop is controlled by a temperature measurement of the outlet gas, which ensures that the flue gas is cooled down by controlling the quantity of water sprayed. The third loop is used to control the adding quantity of fresh slaked lime powder through acid gases (HCl, SO2) of the outlet loop. Flue gas flowing out from the reactor then goes into the bag filter removal of micro particles including hazardous substances. The purified flue gas is discharged by ID fan and vented into the atmosphere. The number of components and their footprints and quite large, requiring large amount of land area.

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