Title: Анализ качества исходного сырья, применяемого для получения компримированного природного газа
Abstract: The paper analyzes the sources of acquisition of the compressed natural gas used as motor fuel. Possibility to ful fill the requirements to the motor properties of the gas motor fuel depends on the values and tolerance of caloricity and methane number of raw materials of different origin (natural gas, liquefied natural gas, biomethane, coal-based methane) used for production of gas motor fuel. National standards of the European countries specify different requirements to caloricity and composition of raw products. Moreover, the gas-transport network is supplied with a refined biogas such as biomethane and with regasified liquefied natural gas. The characters of motor fuel gotten from compressed and liquefied natural gas, biogas, coal methane and shale gas have been investigated. The compressed gas motor fuel standards have been analyzed. As a result it is ascertained that increase in methane and higher hydrocarbons shares in a compressed natural gas will raise its caloricity and decrease its anti-knock value. A significant part of tradable liquefied natural gas supplied to gas-transport nets is saturated with the gas-condensate liquids in a far greater degree than it is specified for compressed natural gas. In some countries a mixture of the liquefied natural gas and oxygen commonly is injected into the supplied natural gas. Change of the quality of gas supplied to the motor-vehicle gasfilling compressor stations is able to degrade the anti-knock value of the compressed natural gas due to a heavy percentage of higher hydrocarbons in the raw product (liquefied natural gas), to the fluctuation of supplied gas parameters within a range of manufacturing tolerance or due to adding of liquefied natural gas in order to level out the parameters instability for gas being supplied through the gas-transport network at the period of peak demand. So, it is important to norm the component percentage (especially ethane and higher hydrocarbons percentage) and to control the anti-knock value of the compressed natural gas manufactured from the natural gas, which parameters fluctuations are smoothed by means of the hydrocarbon gas injection. Biomethane do not contain a lot of ethane and higher hydrocarbons as long as originally biogas contains small portions of these substances. That’s why biomethane is quite applicable for manufacturing of compressed natural gas. In order to insert the shale and coal gases into a pipeline or to use them as a motor fuel they need (due to their original composition) compression and require some processing equipment for gas conditioning (refining and removal of inert components) according to requirements standardized for the pipelined or compressed natural gas. A domestic standard (GOST 27577) for compressed natural gas do not cover limitation of the maximal caloricity values for compressed natural gas in contrast for example to the UNECE Regulation № 49. High caloricity could cause the thermal stress of gas-engines. The anti-knock value is rated by an octane number instead of a methane number. And this does not reflect the real anti-knock values. So, it’s necessary to remove these disadvantages from a new edition of GOST 27577 in order to meet the requirements of the international standards.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot