33 results about "Annular fluidized bed" patented technology

An external heat extractor for catalytic cracking in which particles can be pre-distributed, suitable for catalytic cracking units in oil refineries, characterized in that the external heat extractor (4) is internally equipped with multiple unit heat exchangers with separate water inlets and water outlets The tube (6), the heat exchange tube (6) extends from the top of the external heat extractor (4) to the bottom, and its bottom end is provided with a guide bracket (2) that limits the lateral swing of the heat exchange tube (6). The lower part of the heat exchange tube (6) is submerged in the dense-phase fluidized bed (11) at the bottom of the external heat extractor (4). The hot catalyst particles that come in from the catalyst inlet (10) in the middle part of the external heat extractor (4) first enter an annular fluidized bed (17), and utilize the predistribution of the annular fluidized bed (17) to the particles to make the hot particles flow from the The upper edge of the inner side wall (15) of the annular fluidized bed (17) or the overflow slot (19) provided on the inner side wall (15) evenly flows into the dense phase fluidized bed (11). In the dense-phase fluidized bed (11), the hot particles flow out from the catalyst outlet (1) at the bottom of the external heat extractor (4) after being cooled by contacting the side wall of the heat exchange tube (6). The fluidizing gas of the dense-phase fluidized bed (11) is introduced from the gas distributor (2) at the bottom, and after passing through the dense-phase fluidized bed (11), it is mixed with the fluidizing gas of the annular fluidized bed (17) and then combined The gas enters the dilute phase space of the regenerator of the catalytic cracking unit through the gas outlet (7) provided on the top of the external heat extractor (4).

The invention relates to a tubular bilateral fluidized bed rapid pyrolysis device, and belongs to the technical field of utilization of renewable energy sources. The rapid pyrolysis device comprises an inner pipe, an outer pipe, a supporting sleeve, an annular air distribution plate, a round air distribution plate, a buffer sleeve, a carrier gas uniform distributor and a spiral plate heat exchanger which are coaxially arranged from top to bottom. According to the rapid pyrolysis device disclosed by the invention, the characteristic of high heat transfer efficiency of the fluidized bed and the wall surface of a container is utilized, the fluidized bed in the inner pipe is used as a reaction zone, an annular fluidized bed is additionally at the periphery as a heating zone, and high-temperature flue gas after combustion is used as fluidized carrier gas, so that the comprehensive heat transfer of a reactor is increased, heat absorbed by biomass pyrolysis can be supplemented, and the whole structure is more compact; meanwhile, the counter-flow type spiral plate heat exchanger is added, so that combustion flue gas waste heat can be fully utilized. By changing the flow of two branches in the rapid pyrolysis device, temperature regulation can be realized on the premise that the unchanged fluidizing gas speed of the reaction zone is ensured, and biomass pyrolysis reactions under different technological conditions can be adapted.

The invention provides a lift pipe and air-solid circulation bed coupling reaction device which at least includes a lift pipe, a shower head distributor, a guide cylinder, an annular space air distribution ring, an outer cylinder, an inner circulation pipe, an outer circulation fluidized bed, an outer circulation pipe and an air-solid separating system. Particles and air are transmitted upwards along the lift pipe, pass through the shower head distributor and enter the upper annular fluidized bed to form a central air lifting type circumfluence between the guide cylinder and the annular space. Part of the particles below the outer cylinder enters the lift pipe through the inner circulation pipe and another part enters the outer circulation fluidized bed to be mixed with the original particles in the outer circulation fluidized bed; the mixed particles enter the lift pipe through the outer circulation pipe; the positions where the inner circulation pipe and the outer circulation pipe enter the lift pipe can be flexibly arranged; the lift pipe and air-solid circulation bed coupling reaction device overcomes the limitations of system pressure balance and short reaction time and has the advantages that each area is flexible to be operated and controlled, the air-solid contact efficiency of the annular fluidized bed is high and the resistance above the distributor is small, etc. The device can be broadly applied to the fields of energy supply, chemical industries and particle combustion, etc.

The invention relates to an indirectly heated fluidized bed dryer (1) for drying moist fine-grained bulk material. The fluidized bed dryer (1) comprises a housing (2) with an aerated bottom (6), heat exchanger inners extending above the aerated bottom (6) and at least one (6) The lower discharge device for the dried loose material. The fluidized bed dryer (1) according to the invention is characterized in that the available flow cross section of the housing (2) in the region of the heat exchanger inserts is constant over the entire height of the heat exchanger inserts in the cross section of the housing The case increases in the flow direction of the fluidized medium. Inadmissible expansion of the steady-state fluidized bed is reliably prevented in this way.

The present invention relates to a process for producing metal oxide from metal com pounds, in particular metal hydroxide or metal carbonate, in which the metal compound is conveyed into a reactor (25) with fluidized bed, heated there to a temperature of 650 15 to 1150 DEG C by combustion of fuel, and metal oxide is generated, as well as to a corre-sponding plant. To improve the utilization of energy, it is proposed to introduce a first gas or gas mixture from below through a gas supply tube (26) into a mixing chamber (20) of the reactor (25), the gas supply tube (26) being at least partly surrounded by a stationary annular fluidized bed (27) which is fluidized by supplying fluidizing gas, and 20 to adjust the gas velocities of the first gas or gas mixture and of the fluidizing gas for the annular fluidized bed (27) such that the Particle-Froude numbers in the gas supply tube (26) lie between 1 and 100, in the annular fluidized bed (27) between 0.02 and 2, and in the mixing chamber (20) between 0.3 and 30.

The present invention relates to a method for the conveyance of fine-grained solids in a fluidized bed reactor and also to a corresponding plant. It is proposed to introduce a first gas or gas mixture from below through a central tube ( 3 ) into a mixing chamber ( 7 ) of the reactor ( 1 ), the central tube ( 3 ) being at least partly surrounded by a stationary annular fluidized bed ( 10 ) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed ( 10 ) are adjusted such that the particle Froude numbers in the central tube ( 3 ) are between 1 and 100, in the annular fluidizied bed ( 10 ) between 0.02 and 2 in the mixing chamber ( 7 ) between 0.3 and 30.

The invention provides a circulating accelerating pipe used in an annular fluidized bed reactor, which comprises a 90-degree elbow pipe, a riser pipe, a reducing joint, a three-way pipe, a straight-through pipe joint, a connecting pipe, a first nut, a conical pipe, an O-shaped ring, a gasket and a second nut. The upper end of a main pipe of the three-way pipe is vertically successively connected with the reducing joint, the riser pipe and the 90-degree elbow pipe, the lower end of the main pipe of the three-way pipe is vertically successively connected with the straight-through pipe joint and the connecting pipe, the straight-through pipe joint is fixedly connected with the connecting pipe via the first nut, the conical pipe is mounted in the straight-through pipe joint, the lower end of the conical pipe is clamped in a sunken table at the lower end of a center through hole of the straight-through pipe joint, the top end of the conical pipe is higher than the axis of a side branch pipe of the three-way pipe, the O-shaped ring is disposed between the lower end surface of the conical pipe and the upper end surface of the connecting pipe, the lower end of the connecting pipe is a spraying nozzle, and the side branch pipe of the three-way pipe is an air inlet of the circulating accelerating pipe. The conical pipe is added in the circulating accelerating pipe, so that fluid circulation can be accelerated, and the conversion rate of objective products is improved.

The present invention relates to a method and apparatus for thermal treatment of sulfide ores, in which the solids are heated in a fluidized bed reactor (1) to a temperature of about 450-1500°C. In order to improve the energy utilization, it is proposed to introduce the first gas or gas mixture from below into the mixing chamber (7) of the reactor (1) through a gas supply pipe (3) which is at least partially fluidized by the supply fluidizing gas Surrounded by a fixed annular fluidized bed (35). Adjust the gas velocity of the first gas or gas mixture and the fluidizing gas for the annular fluidized bed (35) so that the particle Froude number in the gas supply pipe (3) is 1-100, and the annular fluidized bed (35) The Froude number of the particles in the mixing chamber (7) is 0.02-2, and the Froude number of the particles in the mixing chamber (7) is 0.3-30.