ENOTEC – Solutions for waste incineration plants

ENOTEC products offer a wide range of applications in various incineration plants, as they can be used in flue gas temperatures of up to 1400 °C, with high dust loads and in corrosive or reducing exhaust gases. The field of application ranges from coal and gas-fired power plants to waste incineration plants, shipbuilding, refineries and crematoria to cement and steel works and the chemical industry. In other words, wherever combustion needs to be controlled efficiently, quickly and precisely.

Our promise:
We at ENOTEC will find a solution for every application, whether customised or from series production. Our customers benefit from our experienced staff and our globally active and well-versed sales and service team.

Around the clock and all over the world.

This application note describes the need to measure oxygen and the sum of combustible components at different installation sites of a waste incineration plant.

Thermal waste treatment is a complex chemical process. Precise knowledge of the conditions in the combustion chamber and downstream of the boiler (where the O₂ value is measured) allows the system to be optimised: maximum throughput of waste (thus maximum energy generation) with minimum residues and minimum pollution.

As some of the waste on the grate is incinerated sub-stoichiometrically, secondary air must be supplied in an afterburner zone in order to completely oxidise the unburnt components. This ‘two-stage’ combustion is used to keep the combustion chamber grate temperature as low as possible so as not to exceed the melting point of the ash and thus prevent caking from molten ash. In addition, a requirement of the 17th BImSchV must be met: a flue gas temperature after the last combustion air supply of at least 850°C, a dwell time of at least 2 seconds and a minimum oxygen content of 6 %.

The high quality and versatility of ENOTEC products means that the customer can cover all important measuring points for combustion monitoring and flue gas cleaning control with just one supplier:

O₂ boiler end (after economiser before E-filter):Combustion control and combustion monitoring: The residual oxygen can be used to make a statement about the quality of combustion. Target min. 6 vol. % O₂. The COe value (i.e. the sum of the combustible components in the flue gas) serves as a backup for combustion control and monitoring.

O₂ after electrostatic precipitator: With the O₂ value before and after the electrostatic precipitator, leakage monitoring and an assessment of the effect of dust separation can also be achieved here. This is also the O₂ reference value for flue gas cleaning.

O₂ after DeNO_x: The O₂ delta before and after the cleaning stages can be used to make a statement about the quality of the cleaning. The O₂ value is also an indicator of leakages.

O₂ after scrubber: The O₂ delta before and after the cleaning stages can be used to make a statement about the quality of cleaning. The O₂ value is also an indicator for leaks and the reference value for the activated carbon filter.

O₂ at the chimney: The O₂ value at the chimney is required as a reference value in order to fulfil the requirements of the 17th BImSchV. ENOTEC also offers complete turnkey emission measurement at.