A non-premixed swirl gas mixing device

Abstract

A non-premixed swirling gas mixing device includes an inner gas delivery pipe and an outer gas delivery pipe. The outer gas delivery pipe is sleeved outside the inner gas delivery pipe. One end of the outer gas delivery pipe is provided with a mixing chamber. The inner gas delivery pipe is provided with a tapered section at the end near the mixing chamber. The tapered section is provided with a hub. The hub is provided with a first blade along the circumference. The end face of the hub facing the mixing chamber is provided with a second blade. The first blade is provided with air holes.

Description

Technical Field

[0001] The invention relates to a gas mixing device, in particular to a non-premixed swirl gas mixing device. Background Art

[0002] The gas phase rapid mixing process is often encountered in the chemical and metallurgical industries. For example, 3-chloro-2-methyl-1-propene (chloroisobutylene) is prepared by the reaction of isobutylene and chlorine. The reaction between isobutylene and chlorine is extremely rapid, and the reaction is generally completed within 0.01 to 1 second. On the other hand, the reaction is a strongly exothermic process. The degree of mixing of isobutylene and chlorine directly affects the axial and radial temperature distribution in the subsequent reactor, and poor temperature distribution will increase the by-products in the reaction, resulting in a decrease in the yield of the target product 3-chloro-2-methyl-1-propene. Therefore, in order to ensure a high yield of 3-chloro-2-methyl-1-propene, isobutylene and chlorine must be fully mixed and uniform in an instant. In addition, in the field of carbonylation metallurgy, the two gases need to be uniformly mixed in a certain proportion to participate in the decomposition reaction, benzene hydrocarbonization reaction, gaseous hydrocarbon oxidation reaction, etc., which all involve a gas phase rapid mixing process. Uneven mixing of gas phase reactants will seriously affect the operation of subsequent processes. Gas phase rapid mixing technology has played a vital role in the chemical and metallurgical industries. Therefore, how to quickly and evenly mix two or more gases within a limited time and space has become an urgent problem to be solved in the chemical production process.

[0003] So far, public reports on gas mixing devices have been common. CN205760848U discloses a multi-component gas mixing device, the principle of which is to provide a plurality of layers of blades in a mixing shell, and drive the blades to rotate by an external driving device to generate a disturbed airflow to mix the multi-component gas in the mixing shell; its disadvantage is that the arrangement of the blades of the device will only accelerate the axial flow of the multi-component gas, while the radial diffusion produced is weak, which has an adverse effect on the mixing effect; in addition, the device needs to be provided with an external driving device, and the large footprint is also a disadvantage.

[0004] CN205613296U discloses a gas mixing device, which includes a mixing shell and an air outlet shell. A mixing chamber is provided in the mixing shell. A first gas enters the mixing chamber in a jetting manner from an air inlet pipe at the left end of the mixing shell to mix with a second gas.

[0005] US2013343147 discloses a mixing device, including a central distribution chamber, the cross-sectional shape of the distribution chamber is circular, and the distribution chamber is composed of a first tube sheet and a second tube sheet intersecting each other; a first air inlet, a second air inlet, and a single air outlet lead into the distribution chamber; the first tube sheet is arranged in the second air inlet, and is equipped with an injection pipe extending into the distribution chamber; the second tube sheet is arranged in the air outlet, and is equipped with a mixing tube in the form of a pipeline. The second gas flows through the injection pipe and enters the corresponding mixing tube, and mixes with the first gas inside the mixing tube.

[0006] CN10472221A discloses a gas mixing device with good mixing effect. The device has a bilaterally symmetrical structure with a mixing chamber in the middle. The main gas enters the gas distribution pipe from the main air inlet pipe, and then enters the mixing pipe from the gas input hole on the gas distribution pipe to mix with the mixed gas for the first time. The mixed gas passes through the tapered guide pipe and flows toward each other in the middle of the mixing chamber to perform a second mixing.

[0007] US4865820 discloses a gas mixer and distributor for a reactor, which is provided with two chambers, wherein the second gas inlet chamber is arranged between the first gas inlet chamber and the reactor inlet, and some tubular or slit-like channels extend from the first chamber through the second chamber and to the inlet of the reaction chamber. The two gases form turbulence in these channels to mix the gases.

[0008] The gas mixing method in the above-mentioned patents CN205613296U, US2013343147, CN10472221A, and CN10472221A is cross-flow mixing, which has the following limitations: if the air flow velocity is low, the fluid penetration is insufficient, and it is difficult to achieve main body diffusion, which affects the mixing effect; for high-velocity gas, it will cause excessive momentum loss, causing the air flow velocity to slow down and the residence time to be prolonged.

[0009] CN203139999U discloses a gas mixing reactor, including an inner cylinder and an outer cylinder, wherein the outer cylinder is arranged outside the inner cylinder, and an annular cavity is formed between the outer wall of the inner cylinder, and the first and second gas inlets are respectively arranged above the inner and outer cylinders, and the inner and outer cylinders are respectively provided with cyclones; two streams of gas enter the inner and outer cylinders respectively to form swirls, and then form jets through the constricted gas outlet to achieve the purpose of mixing, and the mixing method is jet mixing. According to the foreign literature "Forney LJ, Nafia N, Vo H X. Optimum jet mixing in a tubular reactor[J]. AIChEjournal, 1996, 42(11): 3113-3122", the aspect ratio of the parallel coaxial jet mixer to achieve uniform mixing must be greater than or equal to 250. The device forms a jet through the gas outlet end for mixing, but the mixing distance is short, which affects its mixing effect. Summary of the invention

[0010] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a non-premixed swirl gas mixing device with uniform mixing and short mixing distance.

[0011] The technical solution adopted by the present invention to solve its technical problems is: a non-premixed swirl gas mixing device, including a gas delivery inner tube and a gas delivery outer tube, the gas delivery outer tube is sleeved outside the gas delivery inner tube, one end of the gas delivery outer tube is provided with a mixing chamber, the gas delivery inner tube is provided with an inner tube tapered section at the end close to the mixing chamber, the inner tube tapered section is provided with a hub, the hub is provided with a first blade along the circumferential direction, the end face of the hub facing the mixing chamber is provided with a second blade, and the first blade is provided with an air hole.

[0012] Furthermore, a guide cone is provided on the end surface of the hub, and the second blades extend radially outward from the guide cone.

[0013] Preferably, the cone angle of the guide cone is 35° to 65°.

[0014] Furthermore, the angle between the second blade and the hub end face gradually increases along the extension direction of the blade, the vertical height from the top edge of the second blade to the hub end face gradually decreases along the extension direction of the second blade, and guide grooves are formed between adjacent second blades.

[0015] Furthermore, the length of the gas delivery outer tube is 3 to 6 times of its diameter, and the diameter ratio of the gas delivery outer tube to the gas delivery inner tube is 1.5 to 2.

[0016] Furthermore, the gas delivery inner tube is welded to the inner wall of the gas delivery outer tube through a bracket.

[0017] Furthermore, the rotation angle of the first blade is 30° to 45°.

[0018] Furthermore, the first blade is provided with a plurality of pores, and the diameter of the pores is 2 mm to 8 mm.

[0019] Preferably, the first blade is a hollow blade, each blade has 80 to 100 pores, and the number of openings is different, and the pore diameter is uniform or non-uniform.

[0020] Furthermore, the second blade is a curved rib-shaped structure.

[0021] The beneficial effects of the present invention are as follows: two gases are transported through concentric tubes without premixing, and the two gases can be temperature-regulated mutually; one gas reaches the hub through the gas transport inner tube, radially diffuses into the first blade, and then flows out from the pores on the first blade; the other gas is transported to the first blade through the annular gap between the gas transport inner tube and the gas transport outer tube, and drives the first blade to rotate; the special structural design enables the two gases to form a co-directional vortex, and the two gases spiral forward and entrain each other; the two gases are uniformly mixed at a low scale in a short time, and the mixing distance is effectively shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of the three-dimensional structure of an embodiment of the present invention;

[0023] Figure 2 It is a right side view of an embodiment of the present invention;

[0024] Figure 3 It is a three-dimensional diagram of a blade according to an embodiment of the present invention.

[0025] In the figure: 1. gas transmission outer tube, 2. gas transmission inner tube, 3. inner tube bracket, 4. inner tube tapering section, 5. hub, 6. first blade, 7. air hole, 8. second blade, 9. guide cone, 10. guide groove, 11. mixing chamber. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-2As shown, this embodiment includes a gas delivery inner tube 2 and a gas delivery outer tube 1, the gas delivery outer tube 1 is sleeved outside the gas delivery inner tube 2, the gas delivery outer tube 1 and the gas delivery inner tube 2 are coaxial circular tubes, one end of the gas delivery outer tube 1 is provided with a mixing chamber 11, the gas delivery inner tube 2 is provided with an inner tube tapered section 4 at the end close to the mixing chamber 11, the inner tube tapered section 4 is provided with a hub 5, the inner tube tapered section 4 of the gas delivery inner tube 5 is seamlessly connected with the hub 5, the hub 5 is provided with a first blade 6 along the circumferential direction, the end surface of the hub 5 facing the mixing chamber 11 is provided with a second blade 8, and the first blade 6 is provided with an air hole 7.

[0028] The first blade 6 is a hollow blade, each blade has 80-100 pores, and the number of pores varies.

[0029] Chlorine is transported by the gas transport inner tube 2, passes through the inner tube tapered section 4 to reach the hub 5, and after a short stay in the hub 5, radially diffuses into the first blade 6, and finally flows out from the pore 7; isobutylene is transported to the first blade 6 through the pipeline annular gap between the gas transport outer tube 1 and the gas transport inner tube 2, and drives the first blade 6 to rotate; the number of the first blades 6 is 5, and the rotation angle is 45°; the top surface of the hub 5 is lower than the highest point of the first blade 6; a guide cone 9 is provided at the center of the top surface of the hub 5.

[0030] The second blade 8 is a curved rib-like structure, extending radially outward from the guide cone 9, and the vertical height from the top edge of the second blade 8 to the top surface of the hub 5 gradually decreases along the extension direction of the blade, and a guide groove 10 is formed between two adjacent second blades 8; the angle between the second blade 8 and the end surface of the hub 5 gradually increases along the extension direction of the second blade 8, that is, the above angle is the smallest when approaching the guide cone 9, and the angle gradually increases in the radial divergence direction of the second blade 8 until the outermost end of the top surface of the hub 5, at which time the angle is 90°. In this way, the surface of the second blade 8 is a twisted arc surface, and the beneficial effect of this design is that the airflow is subjected to less resistance during the flow process.

[0031] like Figure 3 As shown, the upward edge is the top edge of the second blade 8 , and the upward end surface is the top surface of the hub 5 .

[0032] When the present invention is in operation, the airflow directions generated by the first blade 6 and the second blade 8 are opposite, and the second blade 8 drives the surrounding airflow to move forward, forming a low-pressure area behind the second blade 8. Due to the pressure difference, the isobutylene after the rotation of the first blade 6 is quickly replenished to the low-pressure area along the guide groove 10, and moves forward with the rotation of the second blade 8. Such a structural design allows the two gases to form a co-directional swirl, and the two gases spiral forward and entrain each other, so that the two gases can be uniformly mixed at a low scale in a short time.

[0033] Those skilled in the art may make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalents, then these modifications and variations are also within the protection scope of the present invention.

[0034] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. A non-premixed cyclonic gas mixing device, comprising a gas delivery inner tube and a gas delivery outer tube, wherein the gas delivery outer tube is sleeved outside the gas delivery inner tube, characterized in that: A mixing chamber is provided at one end of the gas delivery outer tube, an inner tube tapered section is provided at the end of the gas delivery inner tube close to the mixing chamber, a hub is provided at the inner tube tapered section, a first blade is provided at the hub along the circumferential direction, a second blade is provided at the end surface of the hub facing the mixing chamber, and an air hole is provided on the first blade; Chlorine is transported by the gas transport inner tube, passes through the inner tube tapered section to reach the hub, and after a short stay in the hub, radially diffuses into the first blade, and finally flows out from the pores; isobutylene is transported to the first blade through the pipeline annular gap between the gas transport outer tube and the gas transport inner tube, and drives the first blade to rotate; the number of the first blades is 5, and the rotation angle is 30° to 45°; the top surface of the hub is lower than the highest point of the first blade, and a guide cone is provided at the center of the top surface of the hub; The second blade is a curved rib-like structure, extending radially outward from the guide cone, and the vertical height from the top edge of the second blade to the top surface of the hub gradually decreases along the extension direction of the blade, and a guide groove is formed between two adjacent second blades; the angle between the second blade and the end surface of the hub gradually increases along the extension direction of the second blade, that is, the above-mentioned angle is the smallest when approaching the guide cone, and the angle gradually increases in the radial divergence direction of the second blade until the outermost end of the top surface of the hub, at which time the angle is 90°.

2. The non-premixed cyclonic gas mixing device according to claim 1, characterized in that: The length of the gas delivery outer tube is 3 to 6 times of its diameter, and the diameter ratio of the gas delivery outer tube to the gas delivery inner tube is 1.5 to 2.

3. The non-premixed cyclonic gas mixing device according to claim 1, characterized in that: The gas delivery inner tube is welded to the inner wall of the gas delivery outer tube through a bracket.

4. The non-premixed cyclonic gas mixing device according to claim 1, characterized in that: The first blade is provided with a plurality of pores, and the diameter of the pores is 2mm-8mm.

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