What should be turned off in case of an accident with an ammonia absorption system?

In the context of an ammonia absorption system, turning off the steam to the generator in the event of an accident is a critical safety measure. The generator is responsible for producing the high-pressure steam that drives the absorption process. If an accident occurs—such as a leak or rupture—it is imperative to cease steam supply to prevent worsening the situation or exacerbating any potential hazard from the ammonia.

By cutting off the steam, the system can halt the absorption cycle, which helps to minimize the risk of further release of ammonia or unwanted pressure build-up in the system. This action can protect personnel and the environment by reducing the chance of exposure to ammonia, which can be hazardous.

Turning off the ammonia pump, water supply to the condenser, or absorber pressure may also be important, but they are not as directly related to stopping the process that produces emissions or pressure at the site of the accident—hence, turning off the steam is the most crucial immediate action to ensure safety.