Radial fixed bed reactor for gas purification

Abstract

The utility model discloses a radial fixed bed reactor for gas purification, and belongs to the technical field of chemical reactors. Aiming at the problems that a traditional radial fixed bed reactor is low in catalyst utilization rate, pressure drop is increased due to catalyst blockage, reaction gas is prone to bias flow, and gas distribution is uneven, the radial fixed bed reactor comprises a reactor shell and a catalyst bed layer, and the reactor shell comprises a barrel, an upper seal head and a lower seal head. A central cylinder is arranged inside the reactor shell, an annular cylinder is sleeved outside the central cylinder, a catalyst bed layer consisting of a catalyst is arranged between the central cylinder and the annular cylinder, and a plurality of reaction gas inlets, a plurality of reaction gas outlets, a plurality of catalyst inlets and a plurality of catalyst outlets are formed in the reactor shell. Through reasonable reactor structure and configuration of the reaction gas inlet and the reaction gas inlet, uniform distribution of reaction gas is ensured, the utilization rate of the catalyst is improved, and the pressure drop is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical reactors, and in particular relates to a radial fixed bed reactor for gas purification. Background Art

[0002] Fixed bed reactors are divided into axial fixed bed reactors, radial fixed bed reactors, and tubular fixed bed reactors according to the flow mode. Among them, radial reactors have the characteristics of large processing capacity, large flow cross-sectional area, and low pressure drop. Due to the large gas flow rate, radial fixed bed reactors are preferred for gas purification. Traditional radial fixed bed reactors have the problems of low catalyst utilization, increased pressure drop due to catalyst clogging, easy deviation of reaction gas, and uneven gas distribution. Utility Model Content

[0003] In view of the problems existing in the existing radial reactors, the utility model proposes a radial fixed bed reactor for gas purification, in which the reaction gas flows radially through the catalyst bed. Through a reasonable reactor structure and configuration of the reaction gas inlet and reaction gas outlet, the reaction gas is ensured to be evenly distributed, the catalyst utilization rate is improved, and the pressure drop is reduced.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A radial fixed bed reactor for gas purification comprises a reactor shell and a catalyst bed, wherein the reactor shell comprises a cylinder, an upper end cap and a lower end cap, and the cylinder is connected to the upper end cap and the lower end cap respectively, a central cylinder is arranged inside the reactor shell, an annular cylinder is arranged outside the central cylinder, a catalyst bed composed of catalyst is arranged between the central cylinder and the annular cylinder, and a plurality of reaction gas inlets, a plurality of reaction gas outlets, a plurality of catalyst inlets and a plurality of catalyst outlets are arranged on the reactor shell.

[0006] Furthermore, the cylinder body, the central cylinder and the annular cylinder are on the same axis, and the top and bottom of the central cylinder and the annular cylinder are connected to the upper head and the lower head respectively.

[0007] Furthermore, the interior of the central tube is a first channel, and the reaction gas inlet is connected to the first channel; the second channel is between the annular tube and the cylinder body, and the reaction gas outlet is connected to the second channel.

[0008] Furthermore, the reaction gas inlet is arranged at the upper end cap and / or the lower end cap, and the reaction gas outlet is evenly distributed in the circumferential direction at the axial middle position of the cylinder.

[0009] Furthermore, the catalyst inlet is arranged at the upper end cover, the catalyst outlet is arranged at the lower end cover, and the number of the catalyst inlet and the catalyst outlet is at least two.

[0010] Furthermore, the central tube and the ring tube are polygonal structures.

[0011] Furthermore, a connecting rib plate is provided between the central tube and the annular tube.

[0012] Furthermore, both the central tube and the annular tube adopt a structure combining a metal wire mesh and louver blades.

[0013] Furthermore, the metal mesh is arranged near the catalyst bed; on the outside of the metal mesh, louver blades are arranged obliquely upward, and the angle α between the louver blades and the metal mesh in the vertical direction is 20° to 50°. The angle between the louver blades and the metal mesh is mainly to prevent the catalyst from overflowing into the gas channels 11 and 12 during filling and operation. If the catalyst enters the louver, the catalyst will automatically flow into the catalyst filling layer.

[0014] Furthermore, the spacing of the shutter blades is H, H is 5 to 20 times the catalyst particle size, the length of the shutter blades is L, and L:H=1.2 to 2.0. The first purpose is to ensure that the reaction gas passes uniformly at a certain gas velocity, and the catalyst cannot be taken out at this gas velocity; the second purpose is that if there is a catalyst overflowing from the metal wire mesh into the shutter, the catalyst will not accumulate and overflow into the gas channels 11 and 12.

[0015] The catalyst bed connects the first channel and the second channel, and the reaction gas flows radially from the first channel through the catalyst bed, which increases the flow cross-sectional area of ​​the reaction gas, increases the contact reaction time between the reaction gas and the catalyst, reduces the system pressure drop and energy consumption, and improves the reaction efficiency.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] (1) The reactor of the utility model has a simple structure and is easy to operate;

[0018] (2) Low reactor pressure drop and energy consumption;

[0019] (3) High catalyst utilization rate;

[0020] (4) The catalyst is easy to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 is a top view of a radial fixed bed reactor;

[0023] Figure 3 Schematic diagram of the central tube and the ring tube.

[0024] Figure numerals: 1. cylinder; 2. upper head; 3. lower head; 4. center cylinder; 5. annular cylinder; 6. catalyst; 7. reaction gas inlet; 8. reaction gas outlet; 9. catalyst inlet; 10. catalyst outlet; 11. first channel; 12. second channel; 13. rib plate; 14. louver blades; 15. wire mesh. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical solution of the present utility model, the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1 A radial fixed bed reactor for gas purification shown in the figure comprises a reactor shell and a catalyst bed, wherein the reactor shell comprises a cylinder 1, an upper head 2 and a lower head 3, and the cylinder 1 is connected to the upper head 2 and the lower head 3 respectively, a central cylinder 4 is provided inside the reactor shell, an annular cylinder 5 is provided outside the central cylinder 4, a catalyst bed composed of a catalyst 6 is provided between the central cylinder 4 and the annular cylinder 5, and a plurality of reaction gas inlets 7, a plurality of reaction gas outlets 8, a plurality of catalyst inlets 9 and a plurality of catalyst outlets 10 are provided on the reactor shell.

[0027] Furthermore, the cylinder body 1, the central cylinder 4 and the annular cylinder 5 are on the same axis, and the tops and bottoms of the central cylinder 4 and the annular cylinder 5 are connected to the upper head 2 and the lower head 3 respectively.

[0028] Furthermore, the interior of the central tube 4 is a first channel 11 , and the reaction gas inlet 7 is connected to the first channel 11 ; the second channel 12 is between the annular tube 5 and the cylinder body 1 , and the reaction gas outlet 8 is connected to the second channel 12 .

[0029] Furthermore, the reaction gas inlet 7 is arranged on the upper end cap 2 and / or the lower end cap 3 , and the reaction gas outlets 8 are evenly distributed in the axial middle position of the cylinder 1 in the circumferential direction.

[0030] Further, the catalyst inlet 9 is arranged at the upper end cover 2, and the catalyst outlet 10 is arranged at the lower end cover 3, and the number of the catalyst inlet 9 and the catalyst outlet 10 is at least two.

[0031] Furthermore, the central tube 4 and the annular tube 5 are polygonal structures.

[0032] Furthermore, a connecting rib plate 13 is provided between the central tube 4 and the annular tube 5 .

[0033] Furthermore, the central tube 4 and the annular tube 5 both adopt a structure in which a metal mesh 15 is combined with shutter blades 14 .

[0034] Furthermore, the metal mesh 15 is arranged near the catalyst bed; on the outer side of the metal mesh 15, louver blades 14 are arranged obliquely upward, and the included angle α between the louver blades 14 and the metal mesh 15 in the vertical direction is 20°~50°.

[0035] Furthermore, the spacing between the shutter blades 14 is H, H is 5 to 20 times the particle size of the catalyst 6, the length of the shutter blades 14 is L, and L:H=1.2 to 2.0.

[0036] Example 1

[0037] The radial fixed bed reactor for gas purification in this embodiment is provided with two reaction gas outlets 8, four catalyst inlets 9, and four catalyst outlets 10; the spacing H of the shutter blades 14 is 30 mm, and the length L of the shutter blades 14 is 60 mm. The included angle α between the shutter blades 14 and the metal wire mesh 15 in the vertical direction is 25°.

[0038] Catalyst 6 is a cylindrical dechlorination catalyst with a length of 6 mm and a particle size of 3 mm; the reactor pressure drop is 2.0 kPa, and the dechlorination efficiency is 95.4%.

[0039] Example 2

[0040] The radial fixed bed reactor for gas purification in this embodiment is provided with 4 reaction gas outlets 8, 6 catalyst inlets 9, and 6 catalyst outlets 10; the spacing H of the shutter blades 14 is 50 mm, and the length L of the shutter blades 14 is 70 mm. The included angle α between the shutter blades 14 and the metal wire mesh 15 in the vertical direction is 35°.

[0041] Catalyst 6 is a spherical hydrolysis catalyst with a particle size of 4 mm; the reactor pressure drop is 2.5 kPa, and the hydrolysis efficiency is 96.3%.

[0042] Example 3

[0043] The radial fixed bed reactor for gas purification in this embodiment is provided with 8 reaction gas outlets 8, 8 catalyst inlets 9, and 8 catalyst outlets 10; the spacing H of the shutter blades 14 is 30 mm, and the length L of the shutter blades 14 is 40 mm. The included angle α between the shutter blades 14 and the metal wire mesh 15 in the vertical direction is 45°.

[0044] Catalyst 6 is a cylindrical desulfurization catalyst with a length of 8 mm and a particle size of 5 mm; the reactor pressure drop is 1.9 kPa and the desulfurization efficiency is 97.4%.

[0045] Example 4

[0046] The radial fixed bed reactor for gas purification in this embodiment is provided with 6 reaction gas outlets 8, 8 catalyst inlets 9, and 6 catalyst outlets 10; the spacing H of the shutter blades 14 is 25 mm, and the length L of the shutter blades 14 is 40 mm. The included angle α between the shutter blades 14 and the metal wire mesh 15 in the vertical direction is 50°.

[0047] Catalyst 6 is a cylindrical dechlorination catalyst with a length of 6 mm and a particle size of 3 mm; the reactor pressure drop is 2.5 kPa and the desulfurization efficiency is 97.8%.

[0048] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A radial fixed bed reactor for gas purification, comprising a reactor shell and a catalyst bed, characterized in that: The reactor shell comprises a cylinder (1), an upper end cap (2) and a lower end cap (3), wherein the cylinder (1) is connected to the upper end cap (2) and the lower end cap (3) respectively; a central cylinder (4) is provided inside the reactor shell, an annular cylinder (5) is provided outside the central cylinder (4); a catalyst bed composed of catalyst is provided between the central cylinder (4) and the annular cylinder (5); and a plurality of reaction gas inlets (7), a plurality of reaction gas outlets (8), a plurality of catalyst inlets (9) and a plurality of catalyst outlets (10) are provided on the reactor shell.

2. A radial fixed bed reactor for gas purification according to claim 1, characterized in that: The cylinder body (1), the central cylinder (4) and the annular cylinder (5) are on the same axis, and the top and bottom of the central cylinder (4) and the annular cylinder (5) are respectively connected to the upper head (2) and the lower head (3).

3. A radial fixed bed reactor for gas purification according to claim 1, characterized in that: The interior of the central cylinder (4) is a first channel (11), and the reaction gas inlet (7) is connected to the first channel (11); between the annular cylinder (5) and the cylinder body (1) is a second channel (12), and the reaction gas outlet (8) is connected to the second channel (12).

4. A radial fixed bed reactor for gas purification according to claim 1, characterized in that: The reaction gas inlet (7) is arranged on the upper end cap (2) and / or the lower end cap (3), and the reaction gas outlets (8) are evenly distributed in the circumferential direction at the axial middle position of the cylinder (1).

5. A radial fixed bed reactor for gas purification according to claim 1, characterized in that: The catalyst inlet (9) is arranged at the upper end cap (2), and the catalyst outlet (10) is arranged at the lower end cap (3). The number of the catalyst inlet (9) and the catalyst outlet (10) is at least two.

6. A radial fixed bed reactor for gas purification according to claim 1, characterized in that: The central tube (4) and the annular tube (5) are polygonal structures.

7. A radial fixed bed reactor for gas purification according to claim 1, characterized in that: A connecting rib plate (13) is provided between the central tube (4) and the annular tube (5).

8. The radial fixed bed reactor for gas purification according to claim 1, characterized in that: The central tube (4) and the annular tube (5) both adopt a structure in which a metal wire mesh (15) and shutter blades (14) are combined.

9. A radial fixed bed reactor for gas purification according to claim 8, characterized in that: The metal wire mesh (15) is arranged on one side close to the catalyst bed; shutter blades (14) are arranged obliquely upward on the outer side of the metal wire mesh (15); the included angle α between the shutter blades (14) and the metal wire mesh (15) in the vertical direction is 20-50 degrees.

10. A radial fixed bed reactor for gas purification according to claim 9, characterized in that: The spacing between the shutter blades (14) is H, H is 5 to 20 times the particle size of the catalyst (6), the length of the shutter blades (14) is L, and L:H=1.2 to 2.0.

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