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1. Information on the storage and transportation of light hydrocarbons in natural gas
Natural gas is a gaseous fossil fuel mainly composed of methane. It mainly exists in oil fields and natural gas fields, with a small amount also found in coal seams. When non fossil organic matter undergoes anaerobic decay, it produces methane rich gas, which is called biogas. The sources of biogas include swamps between forests and grasslands, landfills, sludge in sewers, and manure, which are produced by anaerobic decomposition of bacteria. Biogas also includes gastrointestinal distension (such as farts), which most commonly comes from livestock such as cows and sheep. When methane escapes into the atmosphere, it will be a greenhouse gas that directly contributes to the worsening of global warming. This scattered methane will be regarded as a pollutant rather than a useful energy source. However, once methane in the atmosphere oxidizes with ozone, it becomes carbon dioxide and water, so the greenhouse effect caused by methane emissions is relatively short-lived. And in terms of combustion, natural gas produces much less carbon dioxide than coal and other Carboniferous fuels. The important biological sources of methane are termites, ruminants (such as cows and sheep), and human cultivation of land. It is estimated that the annual emissions of these three are 1
5, 75, and 100 million tons respectively (the total annual emissions are about 100 million tons).
2. Valve Professional English! BALL VALVE A216 Gr. WCB/304+PTFE ANSI 150 # RF FULL B...
Valve List (Chinese English) Air compressor valve Automatic cut-out valve Backlash valve No clearance valve High temperature valve High temperature valve Hospital valve Water hose valve Pipe manifold valve Pipeline collector valve Pneumatic cylinder cock valve Pneumatic cylinder drain valve Pneumatic positioner Pneumatic sanding valve Pneumatic sanding valve Quick opening valve Quick opening valve Quick opening gate valve Quick opening valve Valve standby valve emergency valve; Backup valve two selenium double screw valve valve chest valve chamber valve clearance valve clearance; Valve clearance: Valve operator should wash out the valve, clean the adjusting valve, adjust the valve, and adjust the admission valve intake valve; Air admission valve, air bleed (ing) valve, exhaust valve; Air control valve for exhaust nozzle, air cylinder valve, air escape valve, air inlet valve (=air intake valve); Air operated throttle motor, air pilot valve, air guide valve, air pressure regulator valve, air relay valve, air release valve (=air relief valve), and exhaust valve; Air reversing valve, air shut-off valve, air signal reducing valve, air slide valve, air distribution valve, air starting (control) valve, air winding check valve, air filter dust check valve, air valve, air vent valve, pneumatic pressure regulating valve, air operated directional valve, air compressor valve, air operated valve, air proportional valve, air vacuum two way valve, air vacuum two position valve, alarm valve. Alarm valve aligned grid valve Electronic tube valve Allan valve Allen slide valve altitude valve [aviation] Height valve (adjustable valve for aviation engine vaporizer) Ammonia valve [industrial] Angle back pressure valve, angle globe valve, angle stop valve, curved check valve, angle water valve, angle water valve, annular ring valve; Anti-g valve [aviation] anti overweight valve, anti gravity valve applica