Questions about the buffer tank
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What types of materials need to pass through a buffer tank? Is it okay if they don’t?
Used as a buffer, it can improve stability. In one series, there are buffer tanks at the inlet of both pumps and compressors
Whether it is necessary should be determined by the process engineering team; generally, it is required for gases or gas-liquid mixtures.
As the name suggests, a buffer tank is used for buffering purposes. Therefore, it is only necessary to install one when the process requirements dictate a stable pressure level – for example, at the inlet and outlet of positive-displacement compressors, at the inlet of feed pumps used in reactions, and at various points where processes meet. There is no strict requirement for this; it is up to the designer to decide based on the process requirements. The residence time is also determined based on the buffering needs of that particular process
As the name implies, the primary function of a buffer tank is to buffer gases. In the chemical industry, buffer tanks serve another important purpose as well: preventing backflow (in vacuum systems), and they are also used for vapor-liquid separation. The detailed analysis is as follows: 1. The volume of the gas buffer tank is much larger than that of the pipeline; when there are sudden changes in pressure within the pipeline, the pressure change in the tank is minimal. This makes it easier to control so that there are no sudden fluctuations in the pressure at the other outlet or inlet of the buffer tank, thereby reducing the sudden pressure spikes in the buffer pipeline ； 2. If the gas contains liquid, the buffer tank can be used as a gas-liquid separator; as the flow area increases and the gas velocity decreases, the liquid separates out. The liquid is then removed through the drain valve at the bottom of the buffer tank, thereby achieving separation. In air compressor systems, the compressed air discharged from the compressor outlet is pulsatory in nature, and the air demand also changes continuously; the function of the buffer tank is primarily to reduce the impact of these pulses in the compressed air.