Manual D-LX-700 en.pdf - Durag Group

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Page 18 D-LX 700 Air Coal Air Coal Air Coal LE703-04-001 (Fig. 10) Changes in the flame viewing range in tilting burner applications
D-LX 700 Page 19 13. Purge and Cooling Air The amount of purge and cooling air required for the fibre optic system depends on the site conditions. The purge air should protect the optical surfaces from dust deposits or contamination. A gas-fired burner will require significantly less purge air than a coal-fired burner that creates a great deal of ash. 13.1 Purge and cooling air for the D-LL 703 fibre optic system With purge airflow of 1.5 Nm 3 /h, the exit velocity at the optics is approximately 5 m/s. This corresponds to an air pressure at the purge air inlet of approximately 250 mbar. This purge rate is sufficient for average applications. At installations that have a higher chance of optics contamination, a purge air volume of 3 Nm 3 /h (exit velocity of 10 m/s) is recommended. This corresponds to an inlet pressure of about 500 mbar. Purge air must be oil- and dust-free. The cooling air is needed to protect the system from overheating. For an air velocity of 5 m/s in the outer carrier tube, a flow rate of approximately 12.5 Nm 3 /h is required. To achieve this flow rate, the cooling air pressure at the inlet should be about 100 mbar. With higher ambient temperatures, such as those in gas turbine applications, a cooling air volume of 25 Nm 3 /h or higher may be necessary. This volume can be achieved with a cooling air inlet pressure of approximately 500 mbar. The required air pressure at the inlet port for a given purge or cooling air volume can be determined from the following graph (fig 18). Pressure drops through the supply lines must be taken into account. The curves on this graph do not compensate for any backpressure from the combustion chamber. The supply pressure may need to be increased to achieve the same flow rate and compensate for the furnace pressures on site. LE703-05-001 (Fig. 11) Graph of purge and cooling air volumes for the D-LL 703
Page 1 and 2: English 03/2005 Fibre Optic System
Page 3 and 4: D-LX 700 Table of Contents 1. Gener
Page 5 and 6: D-LX 700 Page 1 1. General Informat
Page 7 and 8: D-LX 700 Page 3 3. Functional Descr
Page 9 and 10: D-LX 700 Page 5 If the cause of the
Page 11 and 12: D-LX 700 Page 7 7.1. Setting the Fl
Page 13 and 14: D-LX 700 Page 9 7.3. Setting the Am
Page 15 and 16: D-LX 700 Page 11 9.2. Selection Cri
Page 17 and 18: D-LX 700 Page 13 10.3. D-LX 700 Dim
Page 19 and 20: D-LX 700 Page 15 10.4.1. Cable and
Page 21: D-LX 700 Page 17 The back end of th
Page 25 and 26: D-LX 700 Page 21 14. Technical Data
Page 27 and 28: D-LX 700 Page 23 17.2 Uninstalling
Page 29 and 30: D-LX 700 Page 25 LE703-12-001 (Fig.
Page 31 and 32: D-LX 700 Page 27 18.3 Mounting the
Page 33 and 34: D-LX 700 Page 29 20. Dimensional Dr
Page 35 and 36: D-LX 700 Page 31 22. Optional Acces

Manual D-LX-700 en.pdf - Durag Group

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