Substitute natural gas

About: Substitute natural gas is a research topic. Over the lifetime, 1216 publications have been published within this topic receiving 23604 citations. The topic is also known as: synthetic natural gas.

Influence of gaseous components and pressures on hydrogen embrittlement of natural gas pipeline

Abstract: Hydrogen usually penetrates metals through defects such as dislocations, vacancies, and crystalline imperfections and causes embrittlement, leading to cleavage fracture and intergranular fracture. Synthetic natural gas produced by coal gasification, biogas, and landfill gas inevitably contain hydrogen. Therefore, hydrogen embrittlement of pipeline materials should be considered when they are mixed with conventional natural gas and supplied to customers. To analyze hydrogen embrittlement of base metals and girth weld metals of API 5L X70 and X65 gas pipelines, a specimen was treated in 100 % hydrogen environment at 10 MPa to determine the hydrogen concentration in it. Small punch (SP) tests were performed under various gaseous components and pressures. When SP tests were performed at very low speed, hydrogen embrittlement could be observed. Specimens became very susceptible to hydrogen embrittlement with increasing hydrogen partial pressure in the hydrogen/methane gas mixture, and the SP energy also decreased dramatically.

Preparation method of synthetic gas methanation catalyst

Abstract: The invention discloses a preparation method of a synthetic gas methanation catalyst. The preparation method is characterized in that a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, one or more aluminum sources, nickel nitrate and one or more auxiliaries as raw materials undergo a one-step synthesis reaction according to a certain ratio by a solvothermal method to produce a desired product. The preparation method has simple processes. The synthetic gas methanation catalyst obtained by the preparation method has a mesoporous structure and controllable aperture sizes and catalyst particle dispersity, can show good sintering resistance, high activity at a low temperature, stability at a high temperature and high methane selectivity in methanation, and has important application values in synthesis of substitute natural gas and solution of the existing natural gas shortage problem.

Method and device for producing synthetic natural gas from organic waste water

Abstract: The invention relates to a method of producing natural gas from organic wastewater, which comprises the following steps: 1 making biogas by anaerobic treating with organic wastewater; 2 pressurizing the gas to 001-003MPa after collecting, cooling and dehydration; 3 removing impurities like sulfide and carbon dioxide from the compressed gas Synthetic natural gas with a methane concentration of over ninety percent can be obtained by the technology which can further produce qualified CNG and LNG The invention plays an important role in fully utilizing resources and increasing economic benefits by reducing pollution to the environment and green house gas emission

Development of a Sorption Enhanced Steam Hydrogasification Process for In-situ Carbon Dioxide (CO2) Removal and Enhanced Synthetic Fuel Production

Abstract: Energy security and climate change are two common challenges in the coming decades. The demand for energy is increasing. The CO2 in the atmosphere has increased to almost 400ppm, and it is mainly from energy usage. How to deal with energy-related CO2 emissions with the increasing demand for energy is becoming more crucial. Carbon capture and sequestration during energy production is an efficient way to guarantee enough energy supply with a smaller carbon footprint. One unique technique is using in-situ CO2 capture technology, which uses a sorbent to capture CO2 directly in the reactor. CO2 is removed quickly as it forms by the sorbent, which can change the equilibrium to promote more energetic production. This technology has great potential to lower CO2 emissions and get higher energy production simultaneously. A new concept of sorption enhanced steam hydrogasification reaction (SE-SHR) is the topic of this thesis. It combines sorption enhanced principles with the steam hydrogasification reaction (SHR). It was found that the addition of sorbent enhanced the CO2 removal and increased the production of H2 and CH4. Particularly, the amount of H2 was increased dramatically. It was found that the increase in H2 was enough to recycle when the CaO/C molar ratio was over 0.29. The sorption enhanced performance was also evaluated by varying other parameters including H2/C and Steam/C molar ratio, gasification temperature and sorbent particle size. A study of the kinetics of the system showed that higher gasification temperature favored faster formation rates of CO2, CO and CH4 during both SHR and SE-SHR. The formation rates of CO2 and CO at 650°C, 700°C and 750°C were much lower during SE-SHR. Several configurations based on SE-SHR for the production of Fischer Tropsch fuel and synthetic natural gas were developed and evaluated. The optimum gasification condition (H2/C-Steam/C) for Fischer Tropsch fuel production using SE-SHR based process was found to be 1.59-2.78. This process had lower total CO2 emissions with higher fuel yield compared to the optimum SHR based process. SE-SHR-Methanation based process for SNG production with the optimum gasification condition (H2/C-Steam/C) of 1.08-2.22 had the highest CH4% and near zero CO2% in the final gas product.

Hydrogen and synthetic natural gas production apparatus and method

Abstract: PROBLEM TO BE SOLVED: To provide a hydrogen and synthetic natural gas production apparatus and method in which the heat efficiency is improved.SOLUTION: A hydrogen and synthetic natural gas production apparatus 1 comprises a synthetic natural gas generation apparatus 2 for generating synthetic natural gas from hydrogen and carbon dioxide by reverse shift reaction and methanation reaction, and a hydrogen generation apparatus 3 for generating hydrogen from hydrogenated aromatic compound by dehydrogenation reaction. In order to utilize the reaction heat of the methanation reaction which is an exothermic reaction, in the dehydrogenation reaction which is an endothermic reaction, the heat is supplied from the synthetic natural gas generation apparatus to the hydrogen generation apparatus.