Showing papers on "Substitute natural gas published in 2002"

Substitute natural gas production system and related method

Abstract: A method and apparatus for producing substitute natural gas are disclosed as including a plasma reactor (PR) which has arc discharge electrodes and a large number of minute arc passages (35) formed in solid carbon materials filled in the plasma reactor. Feed water is converted into steam in steam generating zone (34A) of the plasma reactor and the steam is fed through the minute arc passages in which steam reacts the solid carbon materials in the presence of arc plasmas to produce synthesis gas. The synthesis gas is supplied to a methanation reactor which converts the synthesis gas into substitute natural gas. The arc discharge electrodes may be supplied with controlled electric power such that a H2/CO ratio is maintained at a fixed value. The substitute natural gas may be cooled to separate condensed water, which is recycled to the plasma reactor for production of the steam therein.

Operation of Existing Light Oil Gas-making in Natural Gas Supply

Abstract: Two different ways of operation of the light oil gas-making plant during the period from manufactured gas into natural gas are disscussed. By undirect way, using naphtha, LPG or natural gas as raw material makes reformed gas carbureted with natural gas to get the product gas, which is completely suitable to the existing networks and utensils. And the cost using natural gas as raw material is lower. Using naphtha, LPG as row material makes reformed gas, which blends with LPG in proportion, to get substitute natural gas having basic property of natural gas, as peak-shaving and spare gas source of natural gas for direct way.

A New Preparation Process of Low - Cost Synthesis Gas from Natural Gas and Coal and Its Thermodynamic Analysis

Abstract: As a clean energy, natural gas has been widely used in many developed countries. However, a chemical plant with natural gas as its feed may be often disturbed by the high - cost and insufficient supply of natural gas, which may lead to a decrease of the operation period. To solve these problems, a new process for the preparation of low - cost synthesis gas from natural gas and coal is presented in this paper. Cheaper coal, which serves as a heating material and also a reactant, is fed into the furnace to partially substitute the expensive and largely consumed natural gas. In this way low - cost synthesis gas can be produced. To reduce the investment cost of the gasification unit of coal (about 60% of the total investment) , the preparation furnace can be reconstructed on a small or medium blast furnace left unused in iron steel factories. This new process provides the flexibility to the price fluctuation of natural gas.

Method for producing substitute natural gas and apparatus therefor

Abstract: PROBLEM TO BE SOLVED: To provide both a method for producing a substitute natural gas by which the clean substitute natural gas can be mass-produced at a low cost by using inexpensive water and an inexpensive carbon material as raw materials and an apparatus for producing the substitute natural gas. SOLUTION: A plasma gas composed of steam is subjected to a contact reaction with a solid carbon material at a high temperature in a synthesis gas-producing part 34B of a thermal plasma reactor PR to thereby produce the synthesis gas. The resultant synthesis gas is then subjected to a methanation reaction in a methanation reactor MR to produce a methane-rich gas, which is cooled to separate condensed water. The resultant condensed water is converted into steam to produce the substitute natural gas SNG while circulating the steam as a plasma gas through the synthesis gas-producing part 34B. The H2 /CO ratio is regulated to a prescribed value by controlling an arc current of arc electrodes 36, 38 and 40 with a controller 106.