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ARCA Regler GmbH
Kempener Str. 18
D-47918 Tönisvorst
[ T ] +49(0)2156-7709 0
[ F ] +49(0)2156-7709 55
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1) Main control/shut-off valve for oxygen to the burner
The medium is pure oxygen at an operating pressure of up to 90 bar and a temperature of approximately 40 °C. Drops in pressure are minimal during operation; the valve, however, must reliably block passage when subjected to 90 bar (leakage rate V). Series 6H7-P1 control valves, whose housing and internal parts are made from Monel® or Inconel®, are used.

2) Control valve for oxygen to the inner burner
Operating conditions are identical to those for the main control/shut-off valve. Series 6H1-P1 control valves with housing and internal parts made from Monel® or Inconel® 625 are used due to their smaller nominal size.

3) Blow-off valve for oxygen
This valve is used to divert oxygen into the atmosphere when the plant is started and shut down. Its design and downstream fixed valve stages must, therefore, be able to withstand an operating differential pressure of approximately 90 bar. This valve remains closed and must be leaktight at 90 bar when the plant is operated under normal conditions (leakage rate V) to keep the loss of oxygen at as low a level as possible. The valves used in this application are series 6H7-L3 valves with a downstream LS3 perforated disk assembly; the housing and internal parts as well as the perforated disks are made from Monel® or Inconel®.

4) Control valve for nitrogen
This valve inerts the plant when it is started and shut down and during emergency shutdowns. Nitrogen pressure (typically 130 bar) is considerably higher than the operating pressure of the plant. The nominal width of the 6H1-P1 control valves ranges from DN 25 to DN 40 (1" to 1 ½"). These valves must also be leaktight to prevent any nitrogen from entering the plant during normal operation. Stainless steel provides sufficient strength for the valve housing and internal parts, since nitrogen is all that flows through the valve at this stage of operation and oxygen is only present when the valve is closed.

5) Control valve for injecting steam into coal slurry
A certain amount of high-pressure steam is injected into the coal slurry to disperse it and set the stoichiometric reaction process. The available steam has a pressure in excess of 100 bar and a temperature of approximately 540 °C. Series 6H1-L1 control valves made from heat-resistant cast steel 1.7379 (A217 WC9) are used.

6) Main control valve for syngas
Maintains pressure in the reactor/gas scrubber and regulates the flow of gas to the downstream process. These valves have a large nominal width (typically DN 300/12") in order to manage the high-speed gas stream and are almost always from the 6H7-L1-LN series. Syngas valves are made from cast steel, whereby it is critical that the stuffing box be leaktight due to the high concentration of poisonous carbon monoxide.

7) Blow-off valve for syngas to flare
Additional, series 6H7-P1 shut-off valves are typically used in addition to the flare control valve to direct syngas to the flare. These valves can have a soft seal, since they are designed for a maximum cvs value and thereby low differential pressure. As a result, no syngas dissipates into the flare when the plant operates under normal conditions.

The ARCA team
Rainer Müller
Senior Engineer
[ T ] +49 (0) 2156/7709-205
[ F ] +49 (0) 2156/7709-4205
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