Inlet gas guide ring of gas phase reactor

Abstract

The utility model discloses an inlet gas guide ring of a gas phase reactor, which comprises a hollow guide ring body integrally in a circular ring shape, the center line of the guide ring body coincides with the axis of the gas phase reactor, the bottom of the guide ring body is open, an inner ring of the guide ring body is a complete conical ring, and an inner hole of the inner ring forms a gas flow channel I; the outer ring of the flow guide ring body is a conical ring uniformly provided with a plurality of gas distribution holes, the plurality of gas distribution holes form a gas flow channel II, and the flow guide ring body is erected on the upper side of a gas phase inlet in the bottom of the gas phase reactor and located on the lower side of a gas distribution plate in the gas phase reactor; and an annular gap is formed between the maximum outer diameter part of the flow guide ring body and the inner wall of the bottom sealing head of the gas phase reactor, and forms a gas flow channel III. The flow guide ring can uniformly distribute reaction gas entering the reactor into three gas flows, so that the gas flows can uniformly enter the fluidized bed through the gas distribution plate, the uniformity of the gas flows on a bed layer is ensured, the fluidization effect in the fluidized bed is optimized, and the reaction efficiency of the gas phase reactor is improved.

Description

Technical Field

[0001] The utility model belongs to the field of gas phase reaction, and in particular relates to a gas guide ring for an inlet of a gas phase reactor. Background Art

[0002] Gas phase fluidized bed reactor is a very important type of equipment in the chemical production process. After the reaction gas enters the reactor from the bottom, it undergoes fluidization reaction in the reaction bed through the gas distribution plate. The fluidization effect and reaction efficiency directly depend on the uniformity of gas distribution through the gas distribution plate. For the flat perforated gas distribution plate, the uniformity of gas passing through directly depends on the distribution effect of the gas guide ring, especially for reactors with large diameters. In current gas phase reactors, circular guide rings with triangular solid cross-sections (i.e., both sides and the bottom are closed) are mostly used. The circular guide ring can divide the inlet gas into two gas streams, the center and the side. The two gas streams enter the reactor through the radial inner channel and the radial outer channel of the circular guide ring respectively, and the distribution process is completed before reaching the gas distribution plate.

[0003] The existing circular guide ring with a triangular cross-section divides the inlet gas into two streams. Before reaching the gas distribution plate, the two gases are not evenly distributed. The center has more gas and a faster flow rate, while the reactor wall has less gas and a slower flow rate, resulting in sparse solid materials in the middle of the fluidized bed and dense solid materials around it, affecting the uniformity of the fluidized bed and reducing the reaction efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a gas guide ring at the inlet of a gas phase reactor in view of the deficiencies in the prior art, which can evenly distribute the reaction gas entering the reactor into three air flows: a center air flow, a middle air flow and an outer air flow, so that the air flow can evenly pass through a gas distribution plate into a fluidized bed, thereby ensuring the uniformity of the air flow on the bed layer of the gas phase reactor, optimizing the fluidization effect inside the fluidized bed, and thus improving the reaction efficiency of the gas phase reactor.

[0005] The utility model adopts the following technical solution to solve the above-mentioned technical problems: a gas guide ring for the inlet of a gas phase reactor, comprising a hollow guide ring body in the shape of an overall circular ring, the center line of the guide ring body coincides with the axis of the gas phase reactor, the bottom of the guide ring body is open, the inner ring of the guide ring body is a complete cone ring, the inner hole of the inner ring of the guide ring body constitutes a gas flow channel one, the outer ring of the guide ring body is a cone ring with a plurality of gas distribution holes evenly opened, the plurality of gas distribution holes constitute a gas flow channel two, the guide ring body is mounted on the upper side of the gas phase inlet at the bottom of the gas phase reactor, the guide ring body is located on the lower side of the gas distribution plate in the gas phase reactor, an annular gap is provided between the maximum outer diameter of the guide ring body and the inner wall of the bottom head of the gas phase reactor, and the annular gap constitutes a gas flow channel three.

[0006] The bottom of the guide ring of the utility model is open, and a gas distribution is provided on the outer ring of the guide ring body, so that the reaction gas enters the reactor from the gas phase inlet at the bottom of the reactor and is evenly distributed into three air flows, namely, the center, the middle ring and the outer ring. The air flow channels corresponding to the three air flows are channel one, channel two and channel three respectively, so that the air flow can evenly pass through the gas distribution plate into the fluidized bed, thereby ensuring the uniformity of the air flow on the bed layer of the gas phase reactor, optimizing the fluidization effect inside the fluidized bed, and thus improving the reaction efficiency of the gas phase reactor.

[0007] Preferably, the guide ring body is welded from steel plates, the cross section of the guide ring body is an isosceles right triangle with an open bottom, the inner ring and the outer ring of the guide ring body are welded at the top, the inner ring and the outer ring of the guide ring body respectively constitute two right-angled sides of an isosceles right triangle on the cross section, the bottom of the guide ring body constitutes the hypotenuse of the isosceles right triangle, the guide ring body is supported by a plurality of support plates, and the plurality of support plates are uniformly welded to the inner wall of the bottom head of the gas phase reactor at equal intervals. Under the premise of not affecting the gas circulation, the support plate supports the guide ring body to ensure its guide effect.

[0008] Preferably, a vertical inner reinforcing ring plate is welded to the lower part of the inner ring of the guide ring body, a horizontal inner reinforcing bottom plate is welded between the bottom end of the inner reinforcing ring plate and the bottom end of the inner ring of the guide ring body, a vertical outer reinforcing ring plate is welded to the lower part of the outer ring of the guide ring body, a horizontal outer reinforcing bottom plate is welded between the bottom end of the outer reinforcing ring plate and the bottom end of the outer ring of the guide ring body, and the bottom ends of the inner reinforcing bottom plate and the outer reinforcing bottom plate are respectively welded to the top ends of the several support plates. The reinforcing structure composed of the inner reinforcing ring plate, the inner reinforcing bottom plate, the outer reinforcing ring plate and the outer reinforcing bottom plate can not only connect the support plates, but also increase the rigidity of the guide ring body and maintain the shape of its inner and outer cone rings.

[0009] As a preference, the maximum outer diameter of the guide ring body is denoted as D 1 The diameter of the guide ring body at the vertex is recorded as D 2 , the height of the guide ring body is recorded as H, and the inner diameter of the gas phase inlet at the bottom of the gas phase reactor is recorded as dg, then: D2 = 1.2dg, H = D2 / 5.

[0010] Compared with the prior art, the utility model has the following advantages: the gas guide ring at the inlet of the gas phase reactor of the utility model guides the reaction gas entering the reactor into three streams, so that the reaction gas is distributed more evenly before reaching the gas distribution plate. Without changing the structure and arrangement of the gas distribution plate, the gas volume and gas velocity in the fluidized bed of the gas phase reactor can be distributed more evenly, effectively reducing the radial pressure drop change of the bed layer, thereby improving the "ring-core effect" of solid materials in large-diameter reactors, and improving the uniformity and reaction efficiency of the fluidized reaction process to a certain extent. The guide ring has a simple structure, is easy to manufacture and install, and is particularly suitable for gas phase fluidized bed reactors with large diameters (Di≥2000mm). BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The effect of the guide ring after installation in the embodiment is shown in FIG. Figure 1 ;

[0012] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 It is a partial top view schematic diagram of the guide ring in the embodiment;

[0014] Figure 4 The effect of the guide ring after installation in the embodiment is shown in FIG. Figure 2 ;

[0015] The specific reference numerals in the figure are as follows:

[0016] 1- flow guide ring body, 11- inner ring of the flow guide ring body, 12- outer ring of the flow guide ring body, 13- inner hole of the inner ring of the flow guide ring body, 14- gas distribution hole, 2- gas phase reactor, 21- gas phase inlet, 22- gas distribution plate, 23- annular gap, 24- bottom head, 3- support plate, 41- inner reinforcement ring plate, 42- inner reinforcement bottom plate, 43- outer reinforcement ring plate, 44- outer reinforcement bottom plate. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] The gas phase reactor inlet gas guide ring of the embodiment, such as Figure 1-Figure 4As shown, it includes a hollow guide ring body 1 in an overall circular shape, the center line of the guide ring body 1 coincides with the axis of the gas phase reactor 2, the bottom of the guide ring body 1 is open, the inner ring 11 of the guide ring body 1 is a complete cone ring, the inner hole 13 of the inner ring 11 of the guide ring body 1 constitutes the air flow channel one, the outer ring 12 of the guide ring body 1 is a cone ring with eight air distribution holes 14 evenly opened, the eight air distribution holes 14 constitute the air flow channel two, the guide ring body 1 is erected on the upper side of the gas phase inlet 21 at the bottom of the gas phase reactor 2, the guide ring body 1 is located on the lower side of the gas distribution plate 22 in the gas phase reactor 2, and there is an annular gap 23 between the maximum outer diameter of the guide ring body 1 and the inner wall of the bottom head 24 of the gas phase reactor 2, and the annular gap 23 constitutes the air flow channel three.

[0019] In this embodiment, the guide ring body 1 is welded from steel plates, and the cross-section of the guide ring body 1 is an isosceles right triangle with an open bottom. The top ends of the inner ring 11 and the outer ring 12 of the guide ring body 1 are welded, and the inner ring 11 and the outer ring 12 of the guide ring body 1 respectively constitute two right-angled sides of the isosceles right triangle in the cross-section, and the bottom of the guide ring body 1 constitutes the hypotenuse of the isosceles right triangle. The guide ring body 1 is supported by four support plates 3, and the four support plates 3 are evenly welded to the inner wall of the bottom head 24 of the gas phase reactor 2 at equal intervals. A vertical inner reinforcing ring plate 41 is welded to the lower part of the inner ring 11 of the guide ring body 1, a horizontal inner reinforcing bottom plate 42 is welded between the bottom end of the inner reinforcing ring plate 41 and the bottom end of the inner ring 11 of the guide ring body 1, a vertical outer reinforcing ring plate 43 is welded to the lower part of the outer ring 12 of the guide ring body 1, a horizontal outer reinforcing bottom plate 44 is welded between the bottom end of the outer reinforcing ring plate 43 and the bottom end of the outer ring 12 of the guide ring body 1, and the bottom ends of the inner reinforcing bottom plate 42 and the outer reinforcing bottom plate 44 are respectively welded to the top ends of the four support plates 3.

[0020] In this embodiment, the maximum outer diameter of the guide ring body 1 is recorded as D 1 , the diameter of the annular vertex of the guide ring body 1 is recorded as D 2 , the height of the ring of the guide ring body 1 is recorded as H, and the inner diameter of the gas phase inlet 21 at the bottom of the gas phase reactor 2 is recorded as dg, then: D2 = 1.2dg, H = D2 / 5.

[0021] The guide ring in this embodiment is applied to a gas phase reactor with a larger diameter (Di≥2000mm). The schematic diagram of the effect after installation is as follows: Figure 1 and Figure 4 When the reaction gas enters the reactor 2 from the gas phase inlet 21 at the bottom of the reactor 2, the reaction gas is evenly distributed into three gas streams by the guide ring, as shown in FIG. Figure 4As shown by the middle arrow: the first airflow moves upward along the axis of the reactor 2, and diffuses and guides out along the cone ring of the inner ring 11 of the guide ring, that is, guides out through the airflow channel 1; the second airflow enters the guide ring through the open bottom of the guide ring, and guides out through the air distribution holes 14 on the cone ring of the outer ring 12 of the guide ring, that is, guides out through the airflow channel 2; the third airflow enters the annular gap 23 between the guide ring body 1 and the inner wall of the bottom head 24 of the gas phase reactor 2, and guides out along the inner wall of the bottom head 24, that is, guides out through the airflow channel 3. After passing through the guide ring, the three airflows move upward and diffuse to form the center, middle ring and outer ring airflows, which are evenly introduced into the air holes on the gas distribution plate 22, and then enter the fluidized bed layer of the gas phase reactor 2 to carry out fluidized polymerization reaction. The uniformity of the airflow on the bed layer of the gas phase reactor 2 is guaranteed, thereby optimizing the fluidization effect inside the fluidized bed and improving the reaction efficiency of the gas phase reactor 2.

Claims

1. A gas flow guide ring for an inlet of a gas phase reactor, characterized in that: It includes a hollow guide ring body in an overall circular shape, the center line of the guide ring body coincides with the axis of the gas phase reactor, the bottom of the guide ring body is open, the inner ring of the guide ring body is a complete cone ring, the inner hole of the inner ring of the guide ring body constitutes airflow channel one, the outer ring of the guide ring body is a cone ring with a plurality of air distribution holes evenly opened, the plurality of air distribution holes constitute airflow channel two, the guide ring body is mounted on the upper side of the gas phase inlet at the bottom of the gas phase reactor, the guide ring body is located on the lower side of the gas distribution plate in the gas phase reactor, an annular gap is provided between the maximum outer diameter of the guide ring body and the inner wall of the bottom head of the gas phase reactor, and the annular gap constitutes airflow channel three.

2. A gas guide ring for an inlet of a gas phase reactor according to claim 1, characterized in that: The guide ring body is welded from steel plates, the cross section of the guide ring body is an isosceles right triangle with an open bottom, the top ends of the inner ring and outer ring of the guide ring body are welded, the inner ring and outer ring of the guide ring body respectively constitute two right-angled sides of an isosceles right triangle on the cross section, the bottom of the guide ring body constitutes the hypotenuse of the isosceles right triangle, the guide ring body is supported by a plurality of support plates, and the plurality of support plates are evenly welded to the inner wall of the bottom head of the gas phase reactor at equal intervals.

3. A gas guide ring for an inlet of a gas phase reactor according to claim 2, characterized in that: A vertical inner reinforcing ring plate is welded to the lower part of the inner ring of the guide ring body, a horizontal inner reinforcing bottom plate is welded between the bottom end of the inner reinforcing ring plate and the bottom end of the inner ring of the guide ring body, a vertical outer reinforcing ring plate is welded to the lower part of the outer ring of the guide ring body, a horizontal outer reinforcing bottom plate is welded between the bottom end of the outer reinforcing ring plate and the bottom end of the outer ring of the guide ring body, and the bottom ends of the inner reinforcing bottom plate and the outer reinforcing bottom plate are respectively welded to the top ends of the several support plates.

4. A gas guide ring for an inlet of a gas phase reactor according to claim 3, characterized in that: The maximum outer diameter of the guide ring body is denoted as D1, the diameter at the vertex of the guide ring body is denoted as D2, the height of the guide ring body is denoted as H, and the inner diameter of the gas phase inlet at the bottom of the gas phase reactor is denoted as dg, then: D2=1.2dg, H=D2 / 5.

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