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Turbomachinery for Nitric Acid Plants - MAN Diesel & Turbo

Turbomachinery for Nitric Acid Plants - MAN Diesel & Turbo

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Processes<br />

For the production of nitric acid there<br />

are four basic processes which are distinguished<br />

by their pressure levels <strong>for</strong><br />

combustion and absorption:<br />

4<br />

Low/medium and medium/high<br />

two-pressure process<br />

6<br />

1 Air compressor<br />

2 NH 3 burner<br />

3 NO compressor<br />

1<br />

4 Absorption tower<br />

5 Tail gas expander<br />

6 Steam turbine<br />

2<br />

1. Low/medium two-pressure process<br />

Combustion at atmospheric pressure,<br />

absorption at medium pressure (4-6 bar)<br />

2. Medium-pressure process<br />

Combustion and absorption at medium<br />

pressure (4-6 bar)<br />

3. Medium/high two-pressure process<br />

Combustion at medium pressure (4-6 bar),<br />

absorption at high pressure (10-12 bar)<br />

3<br />

5<br />

4<br />

4. High-pressure process<br />

Combustion and absorption at high<br />

pressure (8-13 bar)<br />

<strong>MAN</strong> <strong>Turbo</strong> has supplied machines <strong>for</strong><br />

all four processes. These are, depending<br />

on the process:<br />

air compressors (cooled and uncooled)<br />

nitrous gas compressors<br />

tail gas expanders<br />

steam turbines.

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