Questions regarding town gas compressors
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What are the main types of urban gas compressors, and what requirements should be met when selecting them?
At present, there are generally two types of town gas in use: natural gas and liquefied gas. For things like artificial gas, mixed gases basically no longer exist. I’ll explain it separately: 1. Apart from long-distance CNG transport (which is rare), compressors are only needed at CNG filling stations. For gas stations, the main types of compressors used are reciprocating, centrifugal, axial flow, and rotary types. The reciprocating type is the preferred choice, suitable for applications with low displacement and high compression ratios. Structurally, compressors come in vertical, horizontal, and angled types; the horizontal type is the best, as it operates stably with low noise. The main parameters considered for selection are: suction pressure, discharge pressure, and displacement volume. 2. Liquefied petroleum gas is used at storage and distribution stations where compressors are employed. Similar to natural gas, it is mainly of the ZW series. Reference can be made to \"Quality of Scrap Products from Oil-Free Lubricated LPG Recirculating Compressors\" JB/T 53187. 3. Common features when selecting between the two types of compressors: 1> Both prefer oil-free reciprocating types; 2> The same parameters are taken into consideration during selection. 4、. . . . . . . . . Difference: 1> Both compressors are dedicated for specific purposes; 2> The compressors used in CNG compression stations are designed to raise gas pressure from low to high, with a high pressure ratio, and the outlet pressure can reach 250 kilograms ； Compressors used for liquefied gas are employed for unloading and transferring gas; they have a low pressure ratio, with an outlet pressure of only around ten to twenty kilograms per square centimeter. The flow rate of these compressors is not high. Compressors used in CNG filling stations have a much higher flow rate compared to those used in liquefied petroleum gas storage and distribution stations. For specific details, refer to the Gas Engineering Design Manual.