摘要:
A system and method for the pyrolysis of a pyrolysis feedstock utilizes a pyrolysis reactor having a pyrolysis conduit and a solids return conduit segment. Each segment is configured with an outlet and an inlet to receive and discharge solid materials that are circulated through the reactor through the different segments. A solids conveyor is disposed within the pyrolysis conduit segment to facilitate conveying solid materials from the solids inlet upward through the pyrolysis conduit segment toward the solids discharge outlet. A pyrolysis feedstock is introduced into the pyrolysis reactor and at least a portion of the feedstock is converted to pyrolysis gases within the pyrolysis conduit segment, which are discharged through a gas outlet. An eductor condenser unit with an eductor assembly having a venturi-restricted flow path for receives a pressurized coolant fluid. A second flow path for receiving the discharged pyrolysis gases intersects the venturi-restricted flow path so that the received pyrolysis gases are combined with the coolant fluid and are discharged together to a mixing chamber that is used to condense pyrolysis gases.
摘要:
The invention relates to a process and a plant for staged separation of concomitants from a raw synthesis gas stream to produce synthesis gas and a sulfur-free naphtha product as a by-product, To remove naphtha compounds and sulfur-containing concomitants, raw synthesis gas is treated with a scrubbing medium in a prescrubbing stage and withdrawn from the prescrubbing stage, and the laden scrubbing medium is mixed with water to bring about a phase separation into a scrubbing medium-water mixture and naphtha, wherein sulfur-containing concomitants are in solution in naphtha. To remove the sulfur-containing concomitants the naphtha is heated to obtain sulfur-free naphtha as a by-product of the gas scrubbing.
摘要:
The present invention provides a process for the manufacture of a synthetic fuel comprising gasifying a carbonaceous feedstock comprising waste materials and/or biomass to generate a raw synthesis gas; supplying the raw synthesis gas to a primary clean-up zone to wash particulates and ammonia or HCl out of the raw synthesis gas; contacting the synthesis gas in a secondary clean-up zone with a physical solvent for sulphurous materials; contacting the desulphurised raw synthesis gas in a tertiary clean-up zone with a physical solvent for CO2 effective to absorb CO2; removing at least part of the absorbed CO2 in a solvent regeneration stage to recover CO2 in a form sufficiently pure for sequestration or other use; and supplying the clean synthesis gas to a further reaction train to generate a synthetic fuel.
摘要:
The invention relates to a process and plant for purifying a raw synthesis gas containing hydrogen and carbon monoxide as target components and carbon dioxide and sulfur components as disruptive components by gas scrubbing with a physically acting, liquid scrubbing medium selective for carbon dioxide and sulfur components. The process/the plant comprise an absorption apparatus, a hot regeneration apparatus, a preferably multistage flash regeneration apparatus and a reabsorber column supplied with the first portion of a stripping gas. According to the invention the flash regeneration apparatus is supplied with the second portion of the stripping gas
摘要:
A method and device for gas scrubbing, in which, in a first scrubbing step, substances of a first kind and, in a subsequent second scrubbing step, substances of a second kind are selectively washed out from the gas mixture that is made to flow in countercurrent to physically acting scrubbing agents, wherein part of the scrubbing agent that is free from substances of the first kind but laden with substances of the second kind in the second scrubbing step is used in the first scrubbing step, and so there occurs a scrubbing agent stream that is laden with substances of the first and second kinds, during the regeneration of which a partly regenerated scrubbing agent stream (semilean); that contains substances of the first and second kinds but has a lower content of substances of the first kind than the scrubbing agent stream laden in the first scrubbing step is generated.
摘要:
The process comprises: introducing a feed flow in a synthesis gas generation unit to form a synthesis gas flow and introducing the synthesis gas flow in a Fischer-Tropsch synthesis unit at least partially removing carbon dioxide from a first flow formed from a Fischer-Tropsch tail gas flow to form a carbon dioxide depleted flow; forming a tail gas recycle flow from the carbon dioxide depleted flow; introducing the tail gas recycle flow in the synthesis gas generation unit and/or in the synthesis gas flow. The process comprises adjusting the carbon dioxide content in the tail gas recycle flow to control the hydrogen to carbon monoxide molar ratio in the synthesis gas flow to a target hydrogen to carbon monoxide molar ratio.
摘要:
An integrated plant to generate chemical grade syngas from a steam biomass reforming in a multiple stage bio reforming reactor for use with either a high temperature or low temperature Fischer-Tropsch synthesis process to produce fuel from biomass is discussed. The first stage has a reactor to cause a chemical devolatilization of a biomass feedstock from the biomass feedstock supply lines into its constituent gases of CO, H2, CO2, CH4, tars, chars, and other components into a raw syngas mixture. A second stage performs further reforming of the raw syngas from the first stage into the chemical grade syngas by further applying heat and pressure to chemically crack at least the tars, reform the CH4, or a combination of both, into their corresponding syngas molecules. The second stage feeds the chemical grade syngas derived from the biomass feedstock to the downstream Fischer-Tropsch train to produce the fuel from the biomass. One or more recycle loops supply tail gas or FT product back into the plant.
摘要:
Sour syngas treatment apparatuses and processes for treating a sour syngas stream are provided herein. In an embodiment, a process for treating a sour syngas stream that includes sulfur components and carbon dioxide includes absorbing the sulfur components and carbon dioxide from the sour syngas stream in a primary liquid/vapor phase absorption stage with a solvent to produce a liquid absorbent stream. The liquid absorbent stream includes the solvent, the sulfur components, and carbon dioxide. A portion of the sulfur components from the liquid absorbent stream is directly oxidized in the presence of a direct oxidation catalyst to produce elemental sulfur and a recycle stream. The recycle stream includes an unconverted portion of the sulfur components and carbon dioxide. The recycle stream is recycled for further absorption of the unconverted portion of the sulfur components and carbon dioxide through liquid/vapor phase absorption.
摘要:
A method to reduce formation of waste water in coal gasification and syngas pretreatment process by increasing the salinity of the waste water thereby reducing the overall volume of waste water formed.
摘要:
A method for cooling and washing biomass syngas, the method including the following steps: 1) introducing biomass syngas having a temperature of between 1000 and 1100° C., a dust content of less than 20 g/Nm3, and a tar content of less than 3 g/Nm3 to a quench tower for condensing a slag; 2) introducing the biomass syngas after slag condensation to a waste heat boiler for recovering waste heat and condensing a heavy tar in the syngas; 3) introducing the biomass syngas from the waste heat boiler to a scrubbing-cooling tower for removing dust and decreasing a temperature of the syngas; and 4) introducing the biomass syngas after dust removal and temperature decrease from the scrubbing-cooling tower to an electro-precipitator for further removal of the dust and the tar.