Bypass stream is a stream that skips one or more stages of the process and goes directly to another downstream stage. Purge stream is a stream bled off to remove an accumulation of inerts or unwanted material that might otherwise build up in the recycle stream.
What is recycle bypass and purge stream?
A recycle stream is one where a portion of the outlet of a process unit is combined with fresh feed and sent into the same unit again. A bypass stream is one where a portion of the inlet to a process unit is split from the feed and instead of entering the process is combined with the outlet from that process.
What is a purge stream?
A purge stream is a portion of a recycle stream that is withdrawn to prevent the buildup of a material that remains entirely in the recycle stream.
Why is it necessary to purge a recycle stream?
Purge streams are necessary to ensure there is little to no accumulation in the system from the recycle stream feeding back into the fresh feed, preventing dilution of reactants due to waste chemicals.
What is a reactor purge?
Purging is an inerting method commonly used in safety-critical process chambers such as reactors to eliminate oxygen and moisture when operations are started up or shut down.
Why bypass is used in chemical industry?
If a reaction releases a large amount of heat it makes the reactor hard and expensive to control thus the concentration of the fed stream can the lowered by diluting the stream with a bypass stream that acts as capacitance for the heat transfer. Thus lowering the temperature of the stream.
Which of the following is decreased by the bypass stream?
5. Which of the following is decreased by the bypass stream? Explanation: Bypass stream decreases the feed and increases the product.
What is recycle ratio in chemical engineering?
A recycle ratio is a key profitability measure of the oil and gas industry. The ratio is calculated by dividing the profit per barrel of oil by the cost of finding and developing that barrel of oil.
How many recycle streams are in the figure?
How many recycle streams are there in the following process? Explanation: There are two recycle streams, one from top reactor to left most reactor and other from right most to left most.
What is tie component?
10 – TIE COMPONENTS
nitrogen in the combustion air passes through unreacted and is used as the tie component. This principle can also be used to measure the flow of a process stream by introducing a measured flow of some easily analysed (compatible) material.
What is Singlepass conversion?
Single-Pass Conversion = reactant input to reactor – reactant output from reactor. reactant input to reactor. ×100%
What is inerting and purging?
Inerting and purging refer to replacing the atmosphere in a line, vessel or other area with an inert atmosphere, eg the space above liquid fuel in a fuel tank, to reduce the likelihood of combustion. Purging of supply lines, pipelines and tanks is a common step before commencing production or prior to shutdown.
Which gas is used for purging?
Why Is Nitrogen Used for Purging? Nitrogen is dry and non-combustible, and the nitrogen displacement of combustible gases will prevent an unstable and potentially ignitable atmosphere.
Why is nitrogen used to purge?
Why Nitrogen Purging Is Required? The benefits of nitrogen purging are numerous, but the most crucial reasons for nitrogen gas purging are to prevent chemical alteration of products and to prevent moisture-related equipment damage or even combustion.