摘要:
A method of firing a biofuel is provided. The method includes: introducing the biofuel into a combustion chamber having a first stage and a second stage; combusting the biofuel in a suspended state while flowing from the first stage to the second stage; and introducing a first air stream and a second air stream into the combustion chamber at the first stage and at the second stage, respectively, to facilitate combustion of the biofuel.
摘要:
A cylindrical furnace having a vertical axis controls combustion. Solid fuel, particulates, and gases inside the furnace rotate around the axis, inducing radial stratification using centrifugal forces. Fuel and particulates drag on the wall of the cylinder, slipping in and out of suspension, thereby increasing particle residence times. The solid particles comprise combustible fuel particles, and non-combustible ash and contaminants. Control of the temperature of non-combustible particles and the wall surface prevents these non-combustible particles from adhering to, and building up on, the furnace wall. It is also advantageous to control the gas temperature leaving the furnace to minimize temperature-driven corrosion of downstream heat-exchange surfaces. Method and apparatuses are described to control the gas, non-combustible particle, and wall temperatures. The furnace can be integrated into a stand-alone boiler or as a combustor in which a portion of the pyrolysis gas from the combusting fuel is burned in a separate vessel.
摘要:
A system includes a solid feed pump having a housing, a rotor disposed in the housing, a curved passage disposed between the rotor and the housing, a solid feed inlet coupled to the curved passage, and a solid feed outlet coupled to the curved passage. Also, a solids packing device is coupled to the solid feed inlet of the solid feed pump. The solids packing device includes a first channel configured to receive a solid feed with a first range of sizes, a second channel configured to receive transport assisting particles (TAP) with a second range of sizes. The first range is different from the second range. A third channel is configured to receive and mix the solid feed and the TAP to provide a solid feed-TAP mixture with the TAP filling interspatial spaces between the solid feed. The third channel is coupled to the solid feed inlet.
摘要:
A system for generating energy from biomass uses an arc-produced gas, either in the primary burn process to achieve higher burning temperatures, in a secondary after-burn process to reduce pollutants, or in both the primary burn process and after-burn process. The use of arc-produced gas results in increased efficiency, reduced emissions, and additional heat energy. Heat produced is used, for example, to generate electricity. In some embodiments, the arc-produced gas is combined with another fuel such as oil or natural gas for desired burn characteristics and/or for economic reasons.
摘要:
The present invention may be embodied as a biofuel heating system for converting biofuel to heat energy to be delivered to a load comprising a combustion chamber defining a combustion zone, an under-fire zone, and an over-fire zone. A controller operates at least one of a fan, an under-fire damper, and an over-fire damper based on at least one operating parameter such that air flows along a flow path extending from at least one of an under-fire port and an over-fire port, through the combustion chamber, through a burn-out port, through a burn-out chamber, through a heat exchange port, through a heat exchange chamber, and out of an exhaust port. The heat exchange system transfers heat energy from air flowing through the heat exchange chamber to the working fluid.
摘要:
Embodiments of apparatuses and methods for controlling heat for rapid thermal processing of carbonaceous material are provided herein. The apparatus comprises a reheater for containing a fluidized bubbling bed comprising an oxygen-containing gas, inorganic heat carrier particles, and char and for burning the char into ash to form heated inorganic particles. An inorganic particle cooler is in fluid communication with the reheater to receive a first portion of the heated inorganic particles. The inorganic particle cooler is configured to receive a cooling medium for indirect heat exchange with the first portion of the heated inorganic particles to form first partially-cooled heated inorganic particles that are fluidly communicated to the reheater and combined with a second portion of the heated inorganic particles to form second partially-cooled heated inorganic particles. A reactor is in fluid communication with the reheater to receive the second partially-cooled heated inorganic particles.
摘要:
A ground supported single drum power boiler is described combining a refractory lined and insulated stepped floor; refractory lined and insulated combustion chamber; integrated fuel chutes configured to pre-dry wet solid fuel; internal chamber walls; configurable combustion air systems; a back pass with after-burner ports and cross flow superheaters; and a rear wall that acts as the downcomers feeding the other walls. A second embodiment is adaptable as a gasifier.
摘要:
Waste burning means, gas treating means in communication with said waste burning means and gas separating means in communication with said gas treating means and waste burning means, said waste burning means includes a burning chamber and pressurized pyrolysis chamber, wherein burning chamber is being made such that it is capable of burning completely organic wastes thereof, whereby gas products of combustion are produced, and said pyrolysis chamber being made such that it is capable of converting plastic wastes into synthesis gases through utilization of heat from the burning chamber, heat exchanging means disposed within the burning chamber being arranged in a manner wherein water from a water source is capable of conversion into steam thereof through utilization of heat in the burning chamber, said gas treating means includes a secondary treatment chamber in communication with the burning chamber, wherein high temperature gas products of combustion coming from the burning chamber is capable of mixing with low temperature steam, said gas separating means being arranged such that the gas products mixed with steam coming from the gas treating means is capable of swirling cyclonic motion thereof, thereby allowing the lighter gases to be discharged to the atmosphere and be separated from particulates and heavier gases which are subsequently recycled and feed back into the burning chamber, and steam and synthesis gas lines provided in the waste burning means being arranged such that it is capable of introduction to the burning chamber the steam produced by the heat exchanging means and synthesis gas coming from the pyrolysis chamber.