39results about How to "Improve carbon utilization" patented technology

The invention provides a method for preparation of methanol, dimethyl ether and low-carbon olefin with synthetic gas, which comprises contacting synthetic gas with a catalyst under the condition that the synthetic gas can be converted into methanol, dimethyl ether and low-carbon olefin. The catalyst contains amorphous alloy and a carrier, the amorphous alloy is a cladding material applied on the carrier and is composed of M and X, wherein X is B and / or P, and M is selected from one or more of IB, IVB, VIIB, VIII and lanthanide elements in the periodic table of elements. The method provided in the invention has the advantages of high CO conversion rate, high selectivity for target products and high carbon utilization rate.

The invention provides a comprehensive utilization method and a comprehensive utilization system for coal-based synthesis gas. The method comprises the following steps, namely, a step of carrying out contact reaction on a gas and a catalyst for methanol synthesis and / or a step of carrying out contact reaction on the gas and a catalyst for low-carbon alcohol synthesis; a step of carrying out contact reaction on the gas and a catalyst for oil synthesis and / or a step of carrying out contact reaction on the gas and a catalyst for natural gas synthesis; and a step of reacting the coal-based synthesis gas according to a process formed by combining the previous steps. In addition, the invention also provides the comprehensive utilization system for coal-based synthesis gas. The system comprises one or a combination of a reactor for methanol synthesis and a reactor for low-carbon alcohol synthesis; and one or a combination of a reactor for oil synthesis and a reactor for natural gas synthesis. By the comprehensive utilization method and a comprehensive utilization system for coal-based synthesis gas provided by the invention, the economical efficiency of the device can be improved to a larger extent and the utilization rate of carbon resources in coal-based synthesis gas is increased.

Aspects of the invention relate to improvements in the flexibility with which oxygen and hydrogen, for example from electrolysis, may be supplied to processes having both gasification and methanation steps, as well as improvements in how such processes may be operated in response to variations in carbonaceous feeds. Offsets, between the ideal quantity of hydrogen and the quantity available from a given source may be compensated for by adjusting one or more operations of the process, and in particular such operation(s) that ultimately impact the quantity of CO and / or CO2 available downstream of the gasifier for conversion to methane in an RNG product stream.

The invention discloses a novel lignite gasification process by using a fluidized bed with ash circulation and equipment of the novel lignite gasification process. According to the novel lignite gasification process, a dried lignite raw material is put into a fluidized bed gasification furnace, a gasifying agent is put into the gasification furnace to perform mixed reaction with the lignite, a synthetic gas generated by the reaction between the lignite and the gasifying agent leaves the gasification furnace and flows to a downstream section after being separated and filtered, and separated fine powder returns to the gasification furnace through a pipeline; one part of the ash generated by lignite combustion is returned to the gasification furnace to perform further burning, and the other part of the ash is discharged from the bottom of the gasification furnace; the ash returned to the gasification furnace can be further burnt in two modes including a gas flow conveying mode and a mechanical conveying mode. According to the process disclosed by the invention, two ash circulating modes including the gas flow conveying mode and the mechanical conveying mode are used to ensure that the ash can be returned to the gasification furnace for continuous burning so as to reduce carbon residues on the ash and improve the carbon utilization ratio when the lignite raw material is converted into the synthetic gas. The process and the equipment are simple and reliable, can effectively reduce investment and increase the running reliability, and have environment-friendly effect and less in pollutant discharge.