Internal backmixing system for reaction blocks in rotating cylindrical reactors

Abstract

The invention relates to a system for backmixing of reaction lumps in a rotating cylindrical reactor. In this case, the invention provides a system for internal backmixing of reaction lumps in a rotating cylindrical reactor (2), which system comprises a first set of drag fins (27) designed to drag the reaction lumps in a first direction and a second set of drag fins (28) designed to drag the reaction lumps in a second direction opposite to the first direction, the first set of drag fins (27) and the second set of drag fins (28) being positioned internally over the entire length of the rotating cylindrical reactor (2). The system described above allows a part of the reaction lumps from a higher stage of the reactor to be mixed with another part of the reaction lumps from another processing stage preceding it, thereby homogenizing the temperature of the reaction lumps and increasing the productivity of the reactor.

Description

Technical Field

[0001] This invention relates to a system for remixing a reaction mass. Specifically, this invention relates to a system for remixing a reaction mass in a rotating cylindrical reactor. Background Technology

[0002] The most common applications of rotating cylindrical reactors include the drying of organic matter and food, the roasting of biomass and food, the pyrolysis of biomass, and the thermal treatment of mineral coal. Generally, these processes aim to improve the characteristics of rotating cylindrical reactors to achieve the highest possible productivity in relation to the quality of the solid products.

[0003] The pyrolysis process of biomass involves an initial endothermic reaction during drying (typically reaching 180°C) followed by calcination (typically reaching 340°C). Subsequently, a very intense exothermic chemical reaction occurs at around 350°C, characterized by significant mass loss of the reaction system and a dramatic transformation in the chemical structure of the solid product (biochar).

[0004] During pyrolysis, organic matter in biomass undergoes thermochemical decomposition under anaerobic conditions through heating, producing products with high carbon content. The characteristics of these products, their relative proportions in the gas, liquid, and solid phases, and the energy required for the process depend on several factors, such as the properties of the precursor biomass and the reaction atmosphere, pressure, drag rate of the reactant gases, temperature, heating rate, and particle size.

[0005] The pressure and drag rate of the reactant gases affect the recombination process of the reactant gases with the solid matrix product (biochar), a process known as chemical vapor deposition.

[0006] Temperature, heating rate, and particle size affect the overall heat transfer rate from the external medium to the interior of the biomass pellets, and thus the productivity of the process.

[0007] Considering the thermodynamic evolution of the biomass pyrolysis process, which has an endothermic initial stage and an exothermic final stage, and taking into account the goal of achieving high-yield rotary reactors, the main objective pursued by the designers of rotary cylindrical reactors is to mix a portion of the final stage reaction block with the reaction block introduced into the reactor during the initial processing stage.

[0008] In a rotating cylindrical reactor, this mixing is achieved via an external screw conveyor. The solid product at the reactor's outlet is broken up, and a portion is returned via a closed screw conveyor and reinjected into the reactor's feed. However, this is a complex system because the reaction chamber temperature is approximately 400°C or higher, and the product cannot come into contact with the atmosphere.

[0009] The present invention aims to solve the above-mentioned problems in a practical and effective manner. Summary of the Invention

[0010] The first objective of this invention is to provide an internal remixing system for reaction blocks in a rotating cylindrical reactor, which allows a portion of the reaction blocks in a higher stage of the reactor to be mixed with another portion of the reaction blocks in a previous processing stage, thereby homogenizing the temperature of the reaction blocks and increasing the productivity of the reactor.

[0011] A second objective of this invention is to provide an internal remixing system for the reaction block of a rotating cylindrical reactor, which eliminates the need for an external system for moving the reaction block, thereby greatly simplifying the reactor design.

[0012] To achieve the above objectives, the present invention provides an internal remixing system for a reaction block in a rotating cylindrical reactor, the system comprising (i) a first set of dragging blades adapted to drag the reaction block in a first direction, and (ii) a second set of dragging blades adapted to drag the reaction block in a second direction opposite to the first direction, wherein the first set of dragging blades and the second set of dragging blades are internally positioned along the length of the cylindrical rotating reactor. Attached Figure Description

[0013] The detailed description presented below refers to the accompanying drawings and their corresponding reference numerals.

[0014] Figure 1 A side cross-sectional view of a cylindrical reactor including a remixing system according to a preferred embodiment of the invention is shown.

[0015] Figure 2 A plan view of the inside of a rotating cylindrical reactor is shown. Detailed Implementation

[0016] Initially, it should be emphasized that the following description is based on preferred embodiments of the invention. However, it will be apparent to those skilled in the art that the invention is not limited to these specific embodiments.

[0017] The present invention solves the above-mentioned technical problem by providing a system for internal backmixing of reaction blocks in a rotating cylindrical reactor 2. For the purposes of this description only, the rotating cylindrical reactor 2 is defined as a cylindrical rotating body having an opening at its end.

[0018] according to Figure 1 and Figure 2 As shown in the preferred embodiment, the system of the present invention includes: a first set of drag blades 27 adapted to drag a reaction block in a first direction; and a second set of drag blades 28 adapted to drag the reaction block in a second direction opposite to the first direction, wherein the first set of drag blades 27 and the second set of drag blades 28 are internally positioned along the length of the rotating cylindrical reactor 2.

[0019] like Figure 1 As shown in the side sectional view, the drag blades in the first group of drag blades 27 and the second group of drag blades 28 are preferably metal sheets, and their height generally corresponds to about one-tenth of the diameter of the rotating cylindrical reactor 2.

[0020] Preferably, the drag blades in the first set of drag blades 27 and the second set of drag blades 28 are attached to the inside of the rotating cylindrical reactor 2 by welding. However, these blades can be attached to the inside of the rotating cylindrical reactor 2 by any attachment method known in the art.

[0021] Figure 2 A plan view of the inner surface of the side of the rotating cylindrical reactor 2 is shown. In the cylindrical form, point A coincides with point A', and point B coincides with point B'. In this example, which is actually composed of manufacturing planes, the inner side plate of the rotating cylindrical reactor 2 is divided into 36 segments along its length and 8 segments along its width. It is worth noting that this segmentation is merely exemplary and illustrative, and other configurations can be made by those skilled in the art.

[0022] In this example, the length and diameter of the rotating cylindrical reactor 2 are L and D, respectively; the number of dashed lines along the length and width of the planar side are n and m, respectively; and the blades are mounting plates inclined relative to the longitudinal lines a, b, c, d, e, f, g, h. The inclination of the propeller blades describes the angle α relative to these longitudinal lines, such that... Where x and y are the dimensions of each segment, such as Figure 2 As shown. Considering and Therefore, the tilt of the airfoil can be written as:

[0023]

[0024] Figure 2The plan view also shows different groups of dragging vanes 27, 28 arranged along longitudinal lines a, b, c, d, e, f, g, h, said groups of dragging vanes 27, 28 adjacent to each other and parallel to the longitudinal axis of the cylindrical rotary reactor 2. The first group of dragging vanes 27 is adapted to drag the reaction block from the inlet to the outlet (from left to right). The second group of dragging vanes 28 is then adapted to drag the reaction block from the outlet to the inlet (from right to left). Clearly, since the ultimate goal is for all reaction blocks entering the inlet to be processed at the outlet, the total area of ​​the vanes in the first group 27 in contact with the reaction block is greater than the total area of ​​the vanes in the second group 28. For example, this can be achieved by having more vanes in the first group 27 than in the second group 28. Alternatively, it is also possible that the two groups have the same number of vanes, but the vanes in the first group 27 are longer and / or wider than the vanes in the second group 28.

[0025] In implementations where a larger number of blades are in the first group of dragging blades 27, the number of blades carrying the reaction block forward (from the inlet to the outlet) is always greater than the number of blades carrying the reaction block backward. For example, for every eight (8) blades in a rotating cylindrical reactor 2, six (6) blades may belong to the first group of dragging blades 27, while two (2) blades belong to the second group of dragging blades 28. In this case, effectively, six (six) blades are used to carry the material forward, while the other two (two) blades perform the work of remixing the reaction block, thereby mixing the portion of the reaction block in the higher reaction (hotter) stage with the portion of the reaction block in the previous reaction (cooler) stage.

[0026] The wing is The distribution in the vertical bands repeats along the entire internal length of the rotating cylindrical reactor 2, thereby creating a forward-dragging chain of reaction blocks, where the regular sections of the vanes carry the hottest reaction blocks to the rear. This arrangement includes a method that promotes heat exchange among the reaction blocks, thereby increasing the productivity of the rotating cylindrical reactor 2.

[0027] Therefore, as shown above, the present invention provides a system for internal backmixing of reaction blocks in a rotating cylindrical reactor. This system allows a portion of the reaction blocks from a higher stage of the reactor to be mixed with another portion of the reaction blocks from a previous processing stage, thereby homogenizing the temperature of the reaction blocks and improving the reactor's productivity. Consequently, this system eliminates the need for an external system for moving the reaction blocks, thus greatly simplifying the reactor design.

[0028] Numerous variations affecting the scope of protection of this claim are also permitted. Therefore, it should be emphasized that the present invention is not limited to the specific configuration / specific example described above.

Claims

1. An internal remixing system comprising a reaction block in a rotating cylindrical reactor (2), characterized in that, The system includes: A first set of drag vanes (27) is arranged to drag the reaction block in a first direction; and A second set of drag vanes (28) is arranged to drag the reaction block in a second direction opposite to the first direction. The first set of drag vanes (27) and the second set of drag vanes (28) are internally positioned along the length of the rotating cylindrical reactor (2); and In this process, the drag blades in the first group of drag blades (27) and the second group of drag blades (28) are attached to the inside of the rotating cylindrical reactor (2) by welding, thereby forming a drag string along a continuous spiral path.

2. The system according to claim 1, characterized in that, The first set of drag blades (27) are arranged to drag the reaction block from the feed port of the rotating cylindrical reactor (2) to the outlet.

3. The system according to claim 1 or 2, characterized in that, The second set of drag vanes (28) is arranged to drag the reaction block from the outlet of the rotating cylindrical reactor (2) to the inlet.

4. The system according to claim 1, characterized in that, The first set of drag blades (27) is adjacent to the second set of drag blades (28), and both the first set of drag blades (27) and the second set of drag blades (28) are parallel to the longitudinal axis of the rotating cylindrical reactor (2).

5. The system according to claim 1, characterized in that, The total area of ​​the first group of drag blades (27) in contact with the reaction block is greater than the total area of ​​the second group of drag blades (28).

6. The system according to claim 5, characterized in that, The system includes a greater number of blades in the first group of drag blades (27) than in the second group of drag blades (28).

7. The system according to claim 5, characterized in that, The blades in the first set of drag blades (27) are longer and / or wider than the blades in the second set of drag blades (28).

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