摘要:
Improvements in a gasification system and process for gasifying carbonaceous feedstock with improved energy efficiency. Improved methods and systems for more efficient removal of particulates from a raw synthesis gas while simultaneously providing a novel mechanism for fluxing agent addition to the gasification reactor. A conditioning agent, in the form of coarse fluxing agent particles, is added to the raw synthesis gas upstream from the particle filtration unit. The conditioning agent allows more rapid turnaround of the filtration unit following filter element replacement, extend filter life, facilitates the removal of filter cake from the particle filters, and combines with removed filter cake for recycling to the gasifier. Addition of fluxing agent via this route eliminates the need to premix fluxing agent with the carbonaceous feedstock, thereby maximizing the rate of feedstock addition to the gasification reactor.
摘要:
The invention relates to the field of power engineering and, more specifically, to systems for generating electricity based on the use of solid fuel, primarily brown and black coal. In the coal gasification method, a gasifier is fed with a uniform activated coal water fuel, the droplets of which are of equal size and the coal particles in said droplets having a similar granulometric composition. The fuel droplets are introduced intermittently in separate doses of fuel with a certain amount of motion being imparted thereto. The milling of the coal for the activated coal water fuel preparation method is adjusted adaptively according to the criterion of the actual amount of volatile substances given off by the coal, and the coal is thoroughly classified according to its granulometric composition. The invention provides for more extensive recovery of thermal energy from coal and more efficient electricity generation.
摘要:
A method (100) of recovering tar from the gasification of a carbonaceous feedstock includes gasifying (12) a carbonaceous feedstock (14) to produce a raw gas (20) which includes at least CO, H2, tar and entrained solids, the raw gas (20) being at a temperature of at least 250° C. and a pressure of at least 15 bar (g). The raw gas (20) is quenched and washed (22) with a quench liquid (24) producing a solids-containing liquid stream (32) which includes tars, the solids-containing liquid stream being at a temperature of at least 150° C. and a pressure of at least 15 bar (g). Solids (56) are separated (46) from the solids-containing liquid stream (32) to provide a tar recovery stream (102). The tar recovery stream (102) is treated by at least cooling (34) and pressure expansion (36) thereof to produce a tar stream (58).
摘要:
This invention relates to a power recovery process in waste steam/CO2 reformers whereby a waste stream can be made to release energy without having to burn the waste or the syngas. This invention does not make use of fuel cells as its critical component but makes use of highly exothermic chemical reactors using syngas to produce large amounts of heat, such as Fischer-Tropsch. It also relates to control or elimination of the emissions of greenhouse gases in the power recovery process of this invention with the goal of producing energy in the future carbonless world economy. A New Concept for a duplex kiln was developed that has the combined functionality of steam/CO2 reforming, heat transfer, solids removal, filtration, and heat recovery. New methods of carbon-sequestering where the syngas produced by steam/CO2 reforming can be used in Fischer-Tropsch processes that make high-carbon content compounds while recycling the methane and lighter hydrocarbons back to the reformer to further produce syngas at a higher H2/CO ratio.
摘要:
In one embodiment, a gasification system component, such as a quench unit or scrubber may retain of pool of a cooling fluid for cooling another fluid. The gasification system component includes a flow damping mechanism designed to dampen flow of the cooling fluid, the other fluid, or both, within the gasification system component. The flow damping mechanism may be disposed in an inner chamber formed between a dip tube and a draft tube or disposed in an outer chamber formed between the walls of the gasification system component and the draft tube. The flow damping mechanism also may be disposed between the inner chamber and the outer chamber.
摘要:
A process of gasification and the production of synthesis gas. A process of biomass gasification and the reduction or elimination of tars from the hydrocarbon-rich product gas derived from biomass gasification. Systems and methods for the reduction of tar from a synthesis gas derived from biomass gasification are provided.
摘要:
The present invention relates to a method for the treatment of a feedstock material, the method comprising: (i) thermally treating a feedstock material to produce an syngas; and (ii) plasma-treating the syngas in a plasma treatment unit in the presence of additional carbon dioxide to produce a refined syngas, wherein the additional carbon dioxide is added to the feedstock material during the thermal treatment and/or to the syngas before plasma treatment and/or introduced in the plasma treatment unit.
摘要:
A two-step gasification process and apparatus for the conversion of solid or liquid organic waste into clean fuel, suitable for use in a gas engine or a gas burner, is described. The waste is fed initially into a primary gasifier, which is a graphite arc furnace. Within the primary gasifier, the organic components of the waste are mixed with a predetermined amount of air, oxygen or steam, and converted into volatiles and soot. The volatiles consist mainly of carbon monoxide and hydrogen, and may include a variety of other hydrocarbons and some fly ash. The gas exiting the primary gasifier first passes through a hot cyclone, where some of the soot and most of the fly ash is collected and returned to the primary gasifier. The remaining soot along with the volatile organic compounds is further treated in a secondary gasifier where the soot and the volatile compounds mix with a high temperature plasma jet and a metered amount of air, oxygen or steam, and are converted into a synthesis gas consisting primarily of carbon monoxide and hydrogen. The synthesis gas is then quenched and cleaned to form a clean fuel gas suitable for use in a gas engine or a gas burner. This offers higher thermal efficiency than conventional technology and produces a cleaner fuel than other known alternatives.
摘要:
A method of reforming a gasification gas, in order to decompose the impurities contained therein, and a use of a noble metal catalyst in the pre-reforming of gasification gas. The gas is brought into contact with a metal catalyst in the presence of an oxidizing agent. The reformation is carried out in several stages, wherein in at least one of the first stages a noble metal catalyst is used, and in a second stage which follows the first stage the catalyst used is a metal catalyst. The use of a noble metal catalyst can reduce the risk of deactivation of the metal catalysts and can increase the operating life of the catalyst.
摘要:
A process for the discharge of slag and ash from a gasification reactor is disclosed. These solids are directed from the gasification reactor into a water bath housed with the gasification reactor in a pressure vessel. There are at least two lock hoppers underneath the water bath which are fed with a stream of water/solids via a pipe and a flow divider element, it being possible to supply the lock hoppers individually and in a controlled manner with a stream of water/solids via shut-off devices. The filling is performed in a manner that encourages the sett-ling process by withdrawing a stream of liquid from the lock hopper being filled, the filling time being controlled so as to prevent the solids settling above the valves and lock hoppers. Also disclosed is an apparatus with at least two lock hoppers underneath the water bath of a gasification reactor, there being, in an advantageous embodiment, a flow divider element and shut-off devices between the water bath and the lock hoppers.