The invention provides a method and device for producing synthetic natural gas The method comprises the continuous technological process that coal or a biomass gasification product is taken as raw materials to produce methane-rich gas containing methane with the mole percent of 94% or above, and the specific technological process comprises the following steps that feed gas (or synthetic gas) is divided into two streams after being preheated, wherein the first-stream feed gas is mixed with recycle gas, and then the mixed gas enters a first methanation reactor segment to be subjected to a reaction to prepare first-segment product gas; the second-stream feed gas is mixed with the cooled first-segment product gas, and then the mixed gas enters a second methanation reactor segment to be subjected to a reaction to prepare second-segment product gas; the prepared second-segment product gas is divided into two streams after being cooled, the first-stream second-segment product gas serves as the recycle gas and then enters the first methanation reactor segment after being pressurized through a recycle compressor, and the second-stream second-segment product gas enters a third methanation reactor segment to be subjected to a reaction to prepare third-segment product gas; the product gas is obtained after gas-liquid separation is performed on the third-segment product gas

Method and device for producing synthetic natural gas

The invention discloses a low-temperature high-activity methanation catalyst and a preparation method thereof. The catalyst comprises metallic nickel as an active component, AL2O3 as a carrier and MgO as a structure auxiliary agent, and an appropriate amount of lanthanum oxide and manganese oxide are added as active auxiliary agents. The catalyst comprises the following main components in percentage by mass: 18-45% of NiO, 40-70% of Al2O3, 5-30% of MgO, 0.4-5% of La2O3 and 0.1-5% of MnO2. The catalyst disclosed by the invention has the advantages of large specific area, uniform nickel dispersity, good heat stability, strong oxidation resistance, low active temperature, adaptability to low hydrogen-carbon ratio and the like. The catalyst is applicable to preparation of LNG (liquefied natural gas) through methanation of industrial gases including coke oven gas, coal synthesis gas, semi coke exhaust gas and the like rich in CO, CO2 and H2, is particularly applicable to a methanation reaction in a low-temperature section, and can effectively improve the quality of synthetic natural gas. Meanwhile, the invention also provides the preparation method of the catalyst, and the preparation method is simple in process flow and can realize industrial production easily.

Low-temperature high-activity methanation catalyst and preparation method thereof

The invention discloses a magnesium aluminate spinel-supported sulphur-tolerant methanation catalyst. The magnesium aluminate spinel-supported sulphur-tolerant methanation catalyst comprises 0-20 parts (by weight) of catalyst auxiliary (M1) AOB (ammonia oxidizing bacteria), 5-90 parts (by weight) of catalyst active component (M2) COD (chemical oxygen demand), 5-90 parts (by weight) of support modifier (M3) EOF (electroosmotic flow), and 100 parts (by weight) of porous support-magnesium aluminate spinel, wherein M1 is Co, Ni, La and/or K; M2 is Mo, W and/or V; and M3 is Ce, Zr, Ti and/or Si.

Magnesium aluminate spinel-supported sulphur-tolerant methanation catalyst

The invention relates to a methanation catalyst for synthesizing substitute natural gas and a preparation method thereof The methanation catalyst comprises Al2o3, MgO, NiO, La2O3, TiO2, CeO2 or ZrO2 and the mixture thereof Compared with the existing methanation catalyst, the methanation catalyst prepared by using the method disclosed by the invention has high conversion ratio, great space velocity, high activity and good thermostability, so that the methanation catalyst and the preparation method thereof are suitable for the adiabatic non-circulation process and the adiabatic cycle process for synthesizing the substitute natural gas through the tail gas in hydrocarbon industries

Methanation catalyst for synthesizing substitute natural gas and preparation method thereof

Methanation method for synthesizing substitute natural gas by using industrial hydrocarbon exhaust gas

Catalyst for preparing substitute natural gas by using coal based synthesis gas, and preparation method thereof

The invention which belongs to the technical field of catalysis relates to a catalyst for methanation and a preparation method thereof. The preparation method comprises the following steps: 1, fully mixing alumina (or pseudoboehmite) with a pore forming agent and a binder, adding deionized water, granulating, drying, compression-molding, and roasting to prepare a catalyst carrier; and 2, dipping the catalyst carrier in a solution of nickel nitrate and lanthanum nitrate (or potassium nitrate, or potassium carbonate, or cerium nitrate, or cerous nitrate), drying, and roasting to prepare the catalyst. The catalyst prepared through the method of the invention, which has the advantages of high mechanical strength and good hydrothermal stability, is suitable for methanation reactions carried out under conditions that the CO content is high and the reaction temperature is high, and can effectively prevent carbon deposition.

Catalyst for methanation and preparation method thereof

The invention belongs to the technical field of catalysis, and relates to a preparation method of a catalyst carrier for preparing substitute natural gas from coal-based syngas. The catalyst carrier is prepared by the steps of mixing alumina (or pseudo-boehmite) with a soluble salt of magnesium, adding deionized water, fully mixing evenly, placing for a certain time, then drying, roasting, smashing, pelletizing with adding an adhesive, drying, carrying out tabletting forming, and roasting to obtain the catalyst carrier. The catalyst carrier prepared by the method has good hydrothermal stability, and has the water absorption rate of 35%-50%. A catalyst prepared by adopting the catalyst carrier and used for preparing the substitute natural gas from the coal-based syngas is suitable for a methanation reaction under conditions of relatively high CO content and relatively high reaction temperature, and can effectively prevent carbon deposition.

Preparation method of catalyst carrier for preparing substitute natural gas from coal-based syngas

Preparation method of methane synthetic catalyst carrier

The invention belongs to the field of energy chemical industry, and discloses a methanation technique for preparing synthetic natural gas from coal-base synthetic gas, which comprises the following steps: synthetic gas, which is obtained by carrying out fine desulfurization on methane synthetic gas from a gas purification section, is divided into three fresh gas streams A, B and C; first-section inlet gas formed by mixing the fresh gas A and circulation gas enters a first section of a methane synthesis reactor, second-section inlet gas formed by mixing first-section outlet gas and fresh gas B enters a second section of the first methane synthesis reactor, and second-section outlet gas of the first methane synthesis reactor and fresh gas C are mixed and enter a second methane synthesis reactor; after outlet gas of the second methane synthesis reactor is cooled, part of gas enters a circulating compressor to be pressurized and returns to the inlet of the first section of the first methane synthesis reactor as circulating gas, and the rest of gas sequentially enters a third methane synthesis reactor and a fourth methane synthesis reactor to be subjected to methane synthetic reaction; and outlet gas of the fourth methane synthesis reactor, in which the methane content is higher than 94% on dry basis, is cooled and dehydrated to obtain satisfactory synthetic natural gas SNG

Zhu Yanfang

Papers

Catalyst for preparing substitute natural gas by using coal based synthesis gas, and preparation method thereof

Catalyst for methanation and preparation method thereof

Preparation method of catalyst carrier for preparing substitute natural gas from coal-based syngas

Preparation method of methane synthetic catalyst carrier

Methanation technique for preparing synthetic natural gas from coal-based synthetic gas