摘要:
A downdraft gasifier (1) has an oxidant inlet (3), a biomass injector (2), a grate (9), a gas exit port (7), and an ash removal system (11). A sensor (10) maintains the height of the bed and a rotating paddle (5) maintains the top of the bed (4) at an even height. The grate arrangement (9) is preferably a sliding grate arrangement which actively moves ash material through the grate. An in-bed oxidant distributor (6) injects oxidant within the bed.
摘要:
A method for controlling the output composition from a gasification device for use in the gasification of biomass using a gasifier in which the biomass and gas both flow in a downward direction. The method combines the use of steam and oxygen as a mixed oxidation stream to control the processes occurring within the gasifier. The oxidants are introduced into the gasifier using a number of injection rings. Each injection ring is comprised of a number of injection nozzles each radially distributed at the same vertical height and possibly connected to the same supply source. Particularly satisfactory results can be achieved through the use of three injection rings, one at the top of the gasifier, one at the interface of the oxidation and reduction zone and one a small distance below the grate assembly. The produced syngas also contains extremely low concentrations of tar and low molecular weight hydrocarbons.
摘要:
A downdraft gasifier (1) has an oxidant inlet (3), a biomass injector (2), a grate (9), a gas exit port (7), and an ash removal system (11). A sensor (10) maintains the height of the bed and a rotating paddle (5) maintains the top of the bed (4) at an even height. The grate arrangement (9) is preferably a sliding grate arrangement which actively moves ash material through the grate. An in-bed oxidant distributor (6) injects oxidant within the bed.
摘要:
A method for controlling the output composition from a gasification device for use in the gasification of biomass using a gasifier in which the biomass and gas both flow in a downward direction. The method combines the use of steam and oxygen as a mixed oxidation stream to control the processes occurring within the gasifier. The oxidants are introduced into the gasifier using a number of injection rings. Each injection ring is comprised of a number of injection nozzles each radially distributed at the same vertical height and possibly connected to the same supply source. Particularly satisfactory results can be achieved through the use of three injection rings, one at the top of the gasifier, one at the interface of the oxidation and reduction zone and one a small distance below the grate assembly. The produced syngas also contains extremely low concentrations of tar and low molecular weight hydrocarbons.
摘要:
An apparatus and method for the continuous production of biofuel by the transesterification of a triglyceride. The apparatus comprises a high shear homogenizer; a reaction chamber; a gravity driven separation device; an evacuated packed thin film stripper; a counter current pack water contactor; and, an evacuated packed spray drier, wherein each component operates with minimal heat and mass transfer resulting in a high capacity process with a reduced footprint.
摘要:
Biomass is preferably first prepared so as to produce the desired size, shape and moisture content. The prepared biomass is introduced along with a gasifying oxidant into a suitable gasification device to produce syngas. A mixture of air and steam may be used as the gasifying oxidant. The syngas is purified to remove particulate matter, ash, aerosols, halogens, sulphur containing compounds and volatile organometallics. The ash produced from the gasifier is collected for later use. The purified syngas is passed through a water gas shift reactor and any carbon monoxide or carbon dioxide are removed from the syngas. The gas is then passed through an ammonia synthesis reactor. The resulting ammonia is then converted into a desired ammonia product. Finally, the ammonia product and the previously removed ash are then mixed to produce a fertilizer.
摘要:
Biomass or refuse-derived fuels (10) and seawater or other non-potable water are used as an input to a combustor/evaporator (15, 20). The resulting steam heats a working fluid in an Organic Rankine Cycle (30, 50, 60, 75) process which drives a turbine (50) to produce mechanical rotation. This rotation can be used to directly drive a process or to generate electricity. The heating of the working fluid cools the steam to produce purified water. The evaporator provides a water purification process for both the separation of dissolved components as well as providing for thermal pasteurization/sterilization. Suitable water inputs are seawater, brackish water and water with those waterborne diseases and pathogens which can be killed through pasteurization/sterilization.
摘要:
A method allowing the efficient conduction of highly exothermic, catalyst initiated reactions, particularly ones in which the product spectrum is highly dependant upon the temperature at which the process is conducted and to diffusional resistances within the catalyst particle matrix. The process occurs in a heat transfer device which consists of at least two channels which have at least one wall in common. Preferably two distinct sets of flow channels exist in which the process proceeds in one set of channels and heat transfer fluid passes through the second. The area of contact between the two sets of channels is sufficiently large to allow the efficient transfer of heat. These dimensions are controlled through the use of hollow catalyst particles through which the process gas can diffuse through either the inside or outside.
摘要:
The invention comprises, in one form thereof, a chemical processing method to thermally contact an endothermic and an exothermic reaction without mixing the two streams, utilizing a thermally coupled monolith reactor (TCMR). A ceramic or metal monolith is modified to produce a structure containing at least two sets of discrete flow paths and which are separated by a number of common walls. Manifolds are arranged such that one reaction mixture flows through one set of channels and a different reaction mixture flows through the second. Catalytic material, which is active for the relevant reaction, is coated onto the inner walls of each of the sets of channels. The two reactions are chosen such that one is exothermic and one is endothermic, such that the energy required by the endothermic process is supplied directly through the dividing wall from the exothermic process occurring on the opposing side. This method of heat transfer completely decouples the gas phase hydrodynamics from the heat transfer process.
摘要:
Biomass is devolatilized to produce both a combustible fuel (syngas) and activated carbon. The activated carbon is used as an adsorbent to capture a contaminant, such as mercury, and stored in a landfill, is impregnated with components with inherent fertilizer properties and tilled into arable land, is used along with coal in an electric power generation facility, or is used to remove mercury or other heavy metals from the flue gas of a coal fired power generation station prior to being stored so as to sequester both carbon and the heavy metal. Thus, both the carbon and the adsorbed mercury or other chemical are sequestered.