6 results about "Downdraft gasifier" patented technology

The utility model discloses a downdraft gasifier explosion-proof device which comprises an access hole, a mounting groove is vertically embedded in the inner wall of the access hole, a protective net is slidably inserted in the mounting groove, and the upper end of the mounting groove extends out of the side wall of the access hole and is provided with an insertion opening matched with the protective net; a reinforcing frame is arranged on the outer edge of the protective net, the reinforcing frame can be inserted into the mounting groove in a sliding mode through the insertion opening, and locking mechanisms are arranged in the side walls of the two sides of the reinforcing frame. The locking mechanism comprises a linkage rod rotationally installed in the side wall of the reinforcing frame, a locking block fixedly arranged on the linkage rod in a sleeving mode and a locking groove formed in the inner wall of the installation groove and corresponding to the locking block. The device is novel in design and simple in structure, can well avoid deflagration caused by fuel leakage when the gasification furnace sprays, is convenient to disassemble and assemble, does not affect gas inlet and maintenance of the gasification furnace, and ensures safe operation of the gasification furnace.

The utility model discloses a jacket type biomass downdraft gasifier which comprises an upper barrel, a lower barrel and a hearth, an overturning fire grate is arranged at the bottom of the hearth; an upper barrel fuel gas interlayer and an air preheating interlayer are arranged in the upper barrel, and a lower barrel fuel gas interlayer is arranged in the lower barrel; a first-stage air distribution system is arranged between the air preheating interlayer and the upper barrel, and a second-stage air distribution system is arranged between the air preheating interlayer and the hearth. Biomass raw materials are sequentially subjected to drying, pyrolysis, oxidation and reduction in the hearth to generate high-temperature biomass fuel gas, most tar in the fuel gas can be cracked through the high reduction area temperature, and the ash content in the fuel gas can be further reduced through the fuel gas interlayer; according to the invention, efficient gasification of biomass is realized, clean biomass fuel gas with low tar and low dust is generated, efficient utilization of heat energy in the process is realized, the temperature of the fuel gas is reduced, and necessary conditions are provided for fuel gas purification and internal combustion engine power generation procedures.

The invention discloses a biomass gasification system based on double-furnace linkage and intermediate product internal digestion, the biomass gasification system comprises a downdraft gasification furnace, a water gas gasification furnace and a heat insulation combustor, the downdraft gasification furnace can directionally gasify biomass, combustible gas and charcoal are generated, and advanced oxidation loss of a carbon source is avoided; the charcoal enters a water gas gasification furnace, combustible gas containing tar enters a heat insulation combustor and is mixed with oxygen-enriched air for combustion, and high-temperature flue gas and water vapor are generated; high-temperature flue gas and water vapor enter the water gas gasification furnace, the high-temperature flue gas can provide heat energy for water gas reaction in the water gas gasification furnace, the water vapor can serve as a gasifying agent to react with charcoal from the downdraft gasification furnace, and finally clean synthesis gas which does not contain tar and is rich in H2 and CO is generated by the water gas gasification furnace; the whole system does not need to additionally treat tar, the gasification efficiency and the target gas proportion are improved, the limitation of a traditional furnace type is broken through, and the requirement of high-value-added chemical synthesis for high-quality feed gas can be met.

The utility model discloses a downdraft gasifier adopting a transverse groove water-cooled anti-slagging grate, which relates to the technical field of gasifiers and comprises a gasifier body, a drying layer, a dry distillation layer, an oxidation layer and a reduction layer are sequentially arranged in the gasifier body from top to bottom, a gas outlet is arranged on the lower portion of the gasifier body, an ash hopper is arranged below the gasifier body, and an ash discharge port is arranged on the ash hopper. The gasification furnace further comprises a hopper connected with a feeding device, and is characterized in that a fire grate is installed in the furnace body and provided with a gasification air channel and a water cooling channel, the gasification air channel is provided with a gasification air outlet, and an inlet of the gasification air channel is communicated with an air blower; the water-cooling channel is tightly attached to the side part of the gasified air channel, an inlet of the water-cooling channel is communicated with the cooling water pump, and an outlet of the water-cooling channel is communicated with the water outlet pipe; according to the utility model, a water-cooling mode is adopted to dissipate heat of the fire grate, the heat dissipation effect is good, and the problem of high-temperature slagging in an oxidation area can be effectively prevented; and meanwhile, the fire grate can rotate, and slag breaking and slag discharging are facilitated.

The utility model discloses a combined type fixed bed gasification furnace, which relates to the technical field of gasification furnaces and comprises a furnace body, the furnace body comprises an upper layer furnace and a lower layer furnace which are overlapped up and down, the upper layer furnace is an updraft type gasification furnace, and the lower layer furnace is a downdraft type gasification furnace; a hopper is arranged above the furnace body and connected with a feeding pipe, and the feeding pipe extends into the upper-layer furnace and the lower-layer furnace and supplies materials to the upper-layer furnace and the lower-layer furnace. An ash hopper is arranged below the furnace body, the ash hopper is communicated with an ash falling opening of the lower-layer furnace, a deslagging auger is arranged at the lower part of the ash hopper, and the deslagging auger is connected with a deslagging header pipe; according to the utility model, the updraft gasifier and the downdraft gasifier are combined, so that the advantages and disadvantages of the two gasifiers are complementary, and the problems that fuel gas is not easy to ignite, stable in combustion, easy to accumulate dust and the like are solved; meanwhile, due to the stacked structural design, the space above the furnace body is fully utilized, so that the gas production rate of the furnace body is higher under the condition of the same occupied area.

The present application relates to biomass processing equipment technical field, specifically for a kind of biomass gas generation system, including downdraft gasifier and the sealing top cover being arranged at its top, further include: rotation is installed on the sealing top cover and extends into the guide material elbow pipe of downdraft gasifier inside;Rotation is installed on the bottom end of the guide material elbow pipe installation sleeve shell, the inside fixed mounting of the installation sleeve shell is equipped with a plurality of material dropping holes on the material dropping seat;The installation sleeve shell is provided with corresponding material dropping hole position on the material dropping seat top material mechanism and material dropping seat cover mechanism.The present application is driven installation sleeve shell by guide material elbow pipe in downdraft gasifier inside rotation and drives material dropping seat top material mechanism, and biomass fuel is extruded into group in material dropping hole, and biomass fuel is discharged in group, fundamentally eliminates the longitudinal stratification phenomenon of different fuel components due to the different natural falling speed of light and heavy, dry and wet, ensures that the material composition and density of entering gasification reaction layer are uniform.