CN115945143A - A fluidized bed reactor for solar fuel production - Google Patents

Abstract

The present invention relates to the fields of thermochemical energy storage concentrating solar power generation and fluidized bed, especially a fluidized bed reactor for solar fuel production, which consists of two concentric circular tubes connected on a section with a conical geometry, In the freeboard area, due to the increase of the section, the gas velocity gradually decreases, and the solid particles descend along the wall of the conical section, and are finally transported to the annulus section. The particles flow to the bottom of the annulus by gravity until they pass through the riser. The four small holes drilled again enter the riser, where the fluidized particles interact directly with the concentrated solar radiation to increase their temperature and promote endothermic chemistry for thermochemical energy storage and solar fuel production. reaction process.

Description

A fluidized bed reactor for solar fuel production

technical field

The invention relates to the field of thermochemical energy storage concentrated solar power generation and fluidized bed, in particular to a fluidized bed reactor for solar fuel production.

Background technique

Due to the intermittent, low density and instability of solar energy, which makes it difficult to supply continuously, there are still many problems to be solved for the wide application of pure solar thermal power generation. Among them, how to realize efficient and large-scale storage of solar energy and ensure continuous and stable supply is a key issue. The key to solar thermal power generation technology, storing solar energy in solar thermochemical fuels has the advantages of high energy conversion efficiency, convenient storage and transportation, and thermal chemical energy storage of solar energy allows for greater density and almost unlimited time scales. and schedulability, while the fluidized bed reactor can improve the uneven distribution of sunlight on the catalyst bed and increase the contact area between the reactant and the catalyst, reduce the temperature fluctuation of the reactor, and improve the uniformity of the temperature distribution, but the solar energy Fluidized bed reactors for fuel production are not widely used, and the utilization rate of radiant heat in heat conversion is not enough.

Contents of the invention

In order to maximize the collection of solar energy, withstand the high concentration flux of typical high-temperature concentrating solar thermal power generation systems, and ensure uniform temperature distribution of reaction materials, the present invention provides a new type of solar thermal power generation and solar fuel production Fluidized bed reactor.

The technical scheme of the present invention is: a fluidized bed reactor for solar fuel production, including an inner tube, an outer tube, a hole, a tapered part and a quartz window, the inner tube and the outer tube are assembled concentrically, and the angle between the upper part and the inner angle is 30° °, the conical part with a height of 120mm is connected, and the top of the conical part is closed by a transparent 3mm thick quartz window with a transmittance of 90% in the wavelength range of 250-2500μm, allowing solar radiation to enter the sealed reactor operation, The gas outlet is located on the upper part of the conical part, and four equidistant holes with a diameter of 6 mm are drilled on the side surface of the inner tube at a height of 40 mm from the bottom. All reactor components are made of stainless steel, and the reactor is covered with multi-layer rock wool blankets. Insulated to minimize heat loss to the outside environment.

The present invention has the following beneficial effects over the prior art: at the outlet of the riser, the fluidized particles interact directly with the concentrated solar radiation to increase their temperature and facilitate absorption for thermochemical energy storage and solar fuel production. During the thermochemical reaction process, in the freeboard area, due to the increase of the cross section, the gas velocity gradually decreases, and the solid particles descend along the wall of the conical section, and are finally transported to the annulus section, where the particles flow to the annulus by gravity. bottom, until it enters the riser again through four small holes drilled in the riser, From a heat transfer point of view, the riser and annulus section can be considered as a double tube heat exchanger where the bed solids are in Preheated by hot particles moving in the annulus section and heated by concentrated solar radiation in the freeboard section as it moves upwards in the riser, the apparent solids flow in the dryer section is recovered through a double-pipe heat exchanger. heat to preheat the bed solids stream entering the riser.

Description of drawings

Figure 1 is a structural diagram of a fluidized bed reactor for solar fuel production.

Figure 2 is a structural diagram of the inner tube and the outer tube.

Figure 3 is a partial enlarged view of the digging location.

In the figure: 1 inner tube, 2 outer tube, 3 hole, 4 tapered part, 5 quartz window.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on this The embodiments in the invention, and all other embodiments obtained by persons of ordinary skill in the art without creative efforts, all belong to the scope of protection of the present invention.

Please refer to Fig. 1, a kind of fluidized bed reactor of solar energy fuel production, comprises inner tube 1, outer tube 2, hole 3, conical part 4 and quartz window 5, and the inner diameter of inner tube is 10mm, and outer diameter is 12mm, The length is 120mm, the inner diameter of the outer pipe is 16mm, the outer diameter is 21mm, and the length is 70mm. The inner pipe and the outer pipe are assembled concentrically, and two areas are marked. The area inside the inner pipe is called the riser section, and the gap between the inner and outer pipes It is called the annulus segment, and accordingly, the inner pipe and the outer pipe will be referred to simply as the riser and the annulus, respectively.

Drill four equidistant holes with a diameter of 6mm on the side surface of the inner pipe at a height of 40mm from the bottom to realize the circulation of solids in the fluidized bed reactor from the annulus to the riser section. When the two pipes are assembled together, the riser The top protrudes about 10mm from the annulus.

Finally, a tube nozzle with an outer diameter of 6mm and an inner diameter of 4mm is located at the bottom of the riser as a fluidizing gas distributor, and the upper part of the annulus is connected to a conical section with an inner angle of 30° and a height of 120mm. The top of the conical section is formed by A transparent 3mm thick quartz window with a transmittance of 90% in the wavelength range of 250-2500μm is closed to allow solar radiation to enter the sealed reactor. The gas outlet is located in the upper part of the cone. All reactor components are made of stainless steel. As a result, the reactor is insulated with multi-layer rock wool blankets to minimize heat loss to the external environment.

The fluidized bed reactor for solar fuel production adjusts the hydrodynamics of the reactor by sending the fluidization gas through the tube nozzle into the riser, using different granular materials as inert bed materials, consisting of silica sand, mullite and alumina powder Composition, usually, the bed solid inert inventory is kept at about 10-12g, natural limestone is used as the reaction material, and the amount of limestone is about 2-3g.

Claims (2)

1. A fluidized bed reactor for producing solar fuel comprises an inner tube, an outer tube, holes, a conical part and a quartz window, wherein the inner tube and the outer tube are assembled concentrically, the upper part of the inner tube is connected with the conical part, the top of the conical part is closed by the quartz window, and four equidistant holes are drilled on the side surface of the inner tube.

2. A fluidized bed reactor for solar fuel production according to claim 1, characterized by comprising: the included angle of the inner angle of the conical section is 30 degrees, and the height of the conical section is 120mm; four equidistant small holes with the diameter of 6mm are drilled in the riser.

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