Institute of Energy Process Engineering and Fuel Technology > Equipment > Investigations of solid, liquid and pulverized fuels in a swirling combustion chamber system at the semi-industrial scale

Investigations of solid, liquid and pulverized fuels in a swirling combustion chamber system at the semi-industrial scale

Contact person:Dr.-Ing. Marco Mancini

Changes to existing processes, for example for plant optimization, are for economical and technical reasons necessary. They are often associated with significant financial and technical risks. Many processes in the thermal process technology sector are, in terms of their efficiency and product quality, greatly dependent on a stable, clean, and reliable combustion procedure. Thus, modifications to the central components of the combustion process require a high level of attention in advance. Experiments conducted at a industrial-relevant scale can provide a significant contribution to the prevention of later difficulties.

The swirl combustion chamber (TBK) offers the IEVB a variable platform with which a number of questions concerning combustion with a thermal output of up to 1 MW can be investigated. In the past, this plant system was already implemented in a large number of research projects and industrial contracts in the area of gaseous, liquid and solid fuel combustion.

The 3.30 m long combustion chamber (5) is vertically oriented (Figure 3.3.2). Secondary air inlets at various heights as well as opportunities for exhaust gas recirculation are integrated into the combustion chamber. Certain measures can be implemented in the ensuing, nearly 10m long, horizontal tube reactor, for example to reduce polutants or to improve product quality (e.g. grain size, see Section 2.4). It is followed by a gas heat exchanger and a gas cleaning apparatus (fabric filters and activated carbon filters).

In general, prior to initial testing, the combustion chamber is fired with natural gas to heat the combustion chamber to the desired operating temperature. If a determined temperature (refractory lined walls; quasi-stationary state) is reached, then the natural gas is replaced over time by the pulverized or liquid fuel until the combustion chamber is exclusively operated with these dust or liquid fuels. During the entire trial period, the composition of the exhaust gas is analyzed for the following components: O2, CO2, CO, NOx, SO2. In order to assess the burnout behaviors of different coals, samples of the solid matter in the exhaust gas are taken. These samples undergo a proximate analysis to determine of Cfix, volatile compounds, water, and ash contents. Sampling can take place at a distances of 1 m from one another in the pipe reactor, whereby the particles collected in the exhaust gas have different residence times.

Figure 3.3.1: Swirl combustion chamber at IEVB

Technical Data

Thermal capacityup to 1 MW
Combustion chamber temperature1800°C
Fuel ow-rateNG

100 m3/h

Oil80 kg/h
Coal dust
Air staging, combustion air preheating
Air staging, combustion air preheating
Exhaust gas reinjection, fuel staging
Varitation der swirl number
Exhaust gas analysisO2, CO2, CO, NOx, SO2

Figure 3.3.2: Technical layout of the swirl combustion chamber


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