refinery flare & slope systam?

Question

any refinery flare how it's work?,what r the importances for that?

Answer 1

A refinery flare is there to burn off normal waste gas flows and gas flows resulting from abnormal and emergency process conditions (for example pressure safety relief systems). Pressure drop is critical in flare systems and the flare is normally just an open pipe with an alloy tip to prolong life (although there may be features such as steam injection to improve combustion) and pilot burners to ignite the flame (or reignite if it goes out)

The flare system will normally have a ground level drum to separate out any liquids.

The flare tip is elevated so that the combustion products are dispersed and do not cause a nuisance at ground level.

A recent development in some refineries is flare gas recovery systems where normal gaseous flows are recovered and do not enter the flare stack. The flare is kept purged by a flow of nitrogen to prevent ingress of air and possible explosive mixtures in the flare stack. There are systems which in the event of pressure build up due to relief valve operation or other causes relieve this flow to the flare and ignite the flare.

Answer 2

Any vessel, drum, tower or any other equipment that holds gases and works under pressure, must be connected to a network of pipelines.
These network of pipelines at the end are connected to knock out drums first. The knock out drums are normally big vessels that has lower pressure than the pressure of the gas in the pipelines.
The purpose of those knockout drums is to make sure that the gases going to be burnt in the flare are only gases. i.e due to the pressure drop, gases goes up and liquid is condensed down to the slop system.
Slops system is (in short) a system for recovery of hydrocarbons and recycling it back to the crude distillation units.