Liquefied natural gas is demanded in various spheres of activity of the person - in the industry, in the road transport, in medicine, in agriculture, in science and so forth. Liquefied gases won considerable popularity due to convenience of their use and transportation and also ecological purity and low cost.
Instruction
1. Before liquefaction of hydrocarbon gas it needs to be cleaned and removed previously water vapor. Carbon dioxide is removed, using the system of three-stage molecular filters. The natural gas purified thus in small amounts is used as regeneration. The restored gas either is burned, or applied to receiving the electric power in power generators.
2. Drying happens to the help of 3 molecular filters. One filter absorbs water vapor. Another dries gas which heats up further and passes through the third filter. For fall of temperature gas is passed via the water cooler.
3. After cleaning and drying of natural gas process of its liquefaction which is consistently carried out on stages begins. Natural gas at each stage of liquefaction is condensed from 5 to 12 times, further is cooled and passes to other stage. At end of the last stage of compression to cooling there is actually a liquefaction of natural gas. Its volume decreases approximately by 600 times.
4. It is possible to receive liquefied gas in several ways: in the turbodetanderny, nitric way mixed, etc. At a turbodetanderny way on GRS receive liquefied natural gas, using energy of pressure difference. It is possible to carry small energy consumption and capital investments to pluses of this method. And to minuses – the low efficiency of liquefaction, dependence on stable pressure, nonflexible production.
5. The nitric way means production of liquefied petroleum gas from any gas sources. It is possible to refer simplicity of technology, high level of safety, flexibility of production, ease and low-cost intensity of operation to advantages of this method. Restrictions of this method - need of a power source and high capital expenditure.
6. At the mixed way of production of liquefied gas as coolant use mix of nitrogen and methane. Receive gas also from any sources. This method differs in flexibility of a production cycle and small variable costs on production. If to compare to a nitric way of liquefaction, here capital expenditure is more essential. The power source is also necessary.