A flow guiding structure tower plate and plate tower thereof

Abstract

The present invention provides a tower plate guide plate, which relates to a plate tower structure of a distillation tower and an absorption tower. The technical solution provided by the present invention is to reduce the plate pressure drop and improve the plate efficiency. The present invention changes the gas flow channel to optimize the flow state and reduce eddy currents by setting a drainage channel, thereby achieving the purpose of reducing the plate pressure drop. The technical solution has a simple structure and is easy to manufacture and install.

Description

Technical Field

[0001] The invention relates to the technical field of industrial equipment, in particular to a flow-guiding structure tower plate and a plate tower thereof. Technical Background

[0002] The Bernoulli principle was proposed by Daniel Bernoulli in 1726. This is the basic principle used in hydraulics before the establishment of the continuous medium theory equation of hydraulics. Its essence is the conservation of mechanical energy of water. That is: kinetic energy + gravitational potential energy + pressure potential energy = constant. Its most famous corollary is: when the flow is at equal height, the greater the flow velocity, the smaller the pressure. Bernoulli's principle is often expressed as p+1 / 2ρv 2 +ρgh=C, this formula is called Bernoulli's equation. In the formula, p is the pressure at a point in the water, v is the velocity of the water at that point, ρ is the water density, g is the acceleration due to gravity, h is the height of the point, and C is a constant. It can also be expressed as p1+1 / 2ρv1 2 +ρgh1=p2+1 / 2ρv2 2 +ρgh2. The commonly used technical solution is the steam jet heat pump, which is mainly composed of a nozzle, a receiving chamber, a mixing chamber, a diffusion chamber and other parts. The working principle of the jet heat pump is to use the energy difference before and after the steam is decompressed as the power. When the high-pressure steam passes through the nozzle, a high-speed airflow is generated, and a low-pressure area is generated at the nozzle outlet. In this area, the low-pressure steam is sucked into the equipment. The high-pressure steam compresses the low-pressure steam while expanding, and the surplus pressure of the high-pressure steam is used to improve the quality of the low-pressure steam. Then, it is well mixed through the mixing chamber, and the mixed steam is restored through the diffusion chamber. Part of the pressure loss is restored, and the required steam pressure is reached before it is supplied to the heat user.

[0003] The tower plate is mainly used in tower equipment such as distillation, extraction, and absorption. It is an important structure of tower equipment mainly used for mass transfer and heat transfer of two-phase fluid contact. Common towers include packed towers and plate towers. Due to the advantages of large operating range, flexible operation, and not easy to be blocked, the plate tower is widely used in chemical tower equipment. Common plate towers include bubble cap tower plates, sieve plate tower plates, floating valve tower plates, injection pedals, three-dimensional tower plates, etc. The improvement of the prior art is mainly to improve the structure on the tower plate, mainly to increase the gas-liquid contact mass transfer efficiency, such as the three-dimensional tower plate studied in the prior art, but the impact of the gas phase affects the liquid phase from entering the cap. At the same time, since the flow channel suddenly decreases when the next layer of gas phase enters the tower plate opening, the static pressure head is converted to static pressure head according to the Bernoulli principle due to energy conservation at the tower plate opening. The pressure drops at the tower plate opening, and the flow channel suddenly increases after passing through the tower plate opening, and the dynamic pressure head is converted to static pressure head. The sudden change of pressure and flow channel easily leads to boundary layer separation and vortex generation, which leads to energy loss, increases the plate pressure drop, and increases the energy consumption of the tower. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and provide a method for optimizing the fluid flow channel, reducing the energy loss caused by eddy currents and sudden changes in flow diameter, thereby reducing the plate pressure drop to achieve energy-saving effects. The present invention is achieved through the following technical means.

[0005] A flow guide structure tower plate comprises a tower plate body and an opening on the plate body, wherein a flow guide hole is arranged on the lower side of the plate body opening, the upper part of the flow guide hole is correspondingly connected to the opening on the plate body, and the upper part of the flow guide hole is small and the lower part is large.

[0006] Furthermore, the openings on the plate body are circular openings or rectangular openings.

[0007] A flow guide structure tower plate according to claim 1, characterized in that a cap is provided on the opening of the plate body.

[0008] Further, the guide hole is arranged on the guide plate, and the guide plate is arranged on the lower side of the plate body.

[0009] Furthermore, the guide plate is a thin plate structure, and the corresponding positions of the guide plate and the tower plate body openings are bent upward to form a guide hole structure with a small upper opening and a large lower opening.

[0010] A plate tower with a flow-guiding structure comprises a tower body and a downcomer, and is characterized in that the tower body is provided with the tower plate with the flow-guiding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The invention is described hereinafter with reference to the accompanying drawings, in which:

[0012] Figure 1 A schematic diagram of a flow guide structure tower plate according to an embodiment of the present invention;

[0013] Figure 2 An exploded view of a flow guide structure tower plate according to an embodiment of the present invention;

[0014] Figure 3 An exploded view of a flow guide structure tower plate according to an embodiment of the present invention;

[0015] Figure 4 A view of a flow guide structure tray according to an embodiment of the present invention;

[0016] Figure 5 A view of a flow guide structure tray according to an embodiment of the present invention;

[0017] Figure 6 A view of a flow guide structure tray according to an embodiment of the present invention;

[0018] Figure 7 A schematic diagram of a plate tower with a flow guide structure according to an embodiment of the present invention;

[0019] Figure 8 A schematic diagram of a plate tower with a flow guide structure according to an embodiment of the present invention;

[0020] Fig. 9 A schematic diagram of a plate tower with a flow guide structure according to an embodiment of the present invention;

[0021] Fig.10 A schematic diagram of the gas phase flow trajectory of a common plate tower according to an embodiment of the present invention;

[0022] Fig.11 The figure is a schematic diagram of the gas phase flow trajectory of a plate tower with a guide structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0024] Embodiment 1

[0025] Reference Figure 1 , Figure 1 A view of a tower plate with a flow guide structure of the present invention comprises a tower plate body 1, wherein the tower plate body 1 is horizontally installed inside the tower body 3, and the present invention does not specifically state that the tower plate body is horizontally installed and the following embodiments will not be repeated, as well as the tower plate openings 101 and flow guide holes 201 opened on the tower plate body; wherein the flow guide holes 201 have the function of guiding the flow of gas, the flow guide holes 102 are connected to the tower plate openings 101 and the contour lines of the lower connection coincide, and the cross-sectional diameter of the other side where the flow guide holes are not connected to the plate openings 101 is larger than the cross-sectional diameter where the flow guide holes 201 are connected to the tower plate openings 101. When in use, the tower plate body is installed inside the tower body, and the gas flows from the flow guide holes 201 into the tower plate openings 101, and then enters the flow guide holes and tower plate openings of the previous tower plate until it is discharged from the tower body. The specific operation method and working principle are shown in the following embodiment of a plate tower with a flow guide structure. Combined with Figures 5 to 6 It can be known that the tower plate opening 2 can be circular or rectangular, and the guide hole 201 on the guide plate 2 can be circular or rectangular.

[0026] Embodiment 2

[0027] Referring to Example 1, it can be found that in order to set the guide hole 201, the tower plate needs to have sufficient thickness. The increase in the thickness of the tower plate body will lead to an increase in the weight of the tower plate, which is not conducive to processing and manufacturing, and the material cost increases. For this reason, this embodiment provides a detachable guide plate 2 structure. Since it can be detached, the main function of the guide plate 2 at this time is to provide a guide effect, so it can be manufactured using lightweight materials to reduce the weight of the equipment, thereby facilitating processing and manufacturing while facilitating installation, which is more conducive to practical applications.

[0028] Reference Figure 2 , Figure 2 A view of a tower plate with a guide structure of the present invention includes a tower plate body 1, a tower plate opening 101 opened on the tower plate body, a guide plate 2, and a guide hole 201 opened on the guide plate, wherein the guide plate 2 is connected to the tower plate body 1, and the guide hole 201 corresponds to the tower plate opening 101, wherein the guide hole 201 has the function of guiding the flow of gas, the guide hole 201 is connected to the tower plate opening 101, and the contour lines of the lower connection coincide, and the cross-sectional diameter of the other side where the guide hole and the plate opening 101 are not connected is larger than the cross-sectional diameter where the guide hole 201 is connected to the tower plate opening 101. When in use, the tower plate body is installed inside the tower body, and the gas flows from the guide hole 201 into the tower plate opening 101, and then enters the guide hole and tower plate opening of the previous tower plate until it is discharged from the tower body. The specific operation method and working principle are shown in the following embodiment of a plate tower with a guide structure. Combined with Figures 5 to 6 It can be known that the tower plate opening 2 can be circular or rectangular, and the guide hole 201 on the guide plate 2 can be circular or rectangular.

[0029] Embodiment 3

[0030] Referring to the second embodiment, it can be found that although the guide plate is provided to facilitate installation and reduce the mass, since the guide hole requires a certain height, the guide plate 2 also needs to be thick enough to open the guide hole 201. Therefore, in order to further reduce the mass of the guide plate, this embodiment provides a thin-shell structure guide plate 2. The thin-shell structure guide plate 2 provided in this embodiment can be formed by stamping or casting a steel plate.

[0031] Reference Figure 3 , Figure 3 A view of a tower plate with a guide structure of the present invention includes a tower plate body 1, a tower plate opening 101 opened on the tower plate body, a guide plate 2, and a guide hole 201 opened on the guide plate, wherein the guide plate 2 is connected to the tower plate body 1, and the guide hole 201 corresponds to the tower plate opening 101, wherein the guide hole 201 has the function of guiding the flow of gas, the guide hole 201 is connected to the tower plate opening 101, and the contour lines of the lower connection coincide, and the cross-sectional diameter of the other side where the guide hole and the plate opening 101 are not connected is larger than the cross-sectional diameter where the guide hole 201 is connected to the tower plate opening 101. When in use, the tower plate body is installed inside the tower body, and the gas flows from the guide hole 201 into the tower plate opening 101, and then enters the guide hole and tower plate opening of the previous tower plate until it is discharged from the tower body. The specific operation method and working principle are shown in the following embodiment of a plate tower with a guide structure. Combined with Figures 5 to 6 It can be known that the tower plate opening 2 can be circular or rectangular, and the guide hole 201 on the guide plate 2 can be circular or rectangular.

[0032] Embodiment 4

[0033] Reference Figure 7 , Figure 8 A schematic diagram of a plate tower with a diversion structure, wherein a downcomer 302 and a horizontal plate 1 are installed in a tower wall 301, wherein the plate is a diversion structure plate with diversion holes as described in Embodiments 1 to 3 of the present invention, wherein the plate 1 is provided with a plate opening 101, and a diversion hole 201 is provided below the plate opening, wherein the downcomer can be arranged on both sides of the tower body such as Figure 7 Figure 8 As shown; it can also be set on both sides and the center of the tower body, and one layer is set in the center and one layer is set on both sides alternately. Fig. 9 shown.

[0034] During operation, liquid flows down from the upper horizontal tower plate, and flows into the upper part of the tower plate body 1 of this layer through the downcomer 302, and flows along the tower plate 2 of this layer toward the downcomer 303 of the lower layer, thereby forming a liquid layer above the tower plate body 1. The rising gas passes through the tower plate opening 101 through the guiding effect of the guide hole 201, and then passes through the liquid layer gas on the tower plate body 1 and continues to rise into the upper tower plate; thereby achieving contact between the liquid phase and the gas phase, realizing mass transfer and heat transfer, and achieving the purpose of separating the components.

[0035] Combination Fig.10 and Fig.11 It can be seen that the tower plate structure without the guide hole 201 forms a flow as shown by the vortex 401 at the tower plate opening 101 due to the sudden reduction of the gas phase flow channel. The existence of the vortex will cause the flow energy to be dissipated as heat energy, resulting in increased flow losses, and even more energy required for the gas phase to pass through the tower plate, thereby increasing the plate pressure drop and causing the tower plate efficiency to decrease. Fig.11 The use of guide holes can guide the gas phase, thereby avoiding vortices caused by the sudden contraction of the gas phase flow channel, thereby effectively reducing energy loss and plate pressure drop, thereby helping to increase the efficiency of the tower plate and the efficiency of the distillation tower, thereby achieving the effect of energy saving and emission reduction.

[0036] In order to verify the role of the guide hole, the engineering fluid simulation software was used to simulate the pressure drop of the tower plate with and without flow control. The simulation model has a diameter of 300mm, a tower body length of 500mm on both sides of the tower plate, a rectangular opening of 200mm×200mm, a tower plate thickness of 6mm, and a circular chamfer with a chamfer radius of 20mm. In the engineering simulation, the viscous model uses the ke model, the simulated gas phase is set to air, the inlet uses a speed-controlled inlet, and the inlet velocity is 1m / s. The experimental results show that the pressure drop of a single-layer plate without a guide hole 201 is 182.0Pa, and the pressure drop of a plate with a guide hole 201 is 95.7Pa, and there is no guide hole 201; at the same time, simulations are carried out at different inlet velocities. At 5m / s, the experimental results show that the pressure drop of a single-layer plate without a guide hole 201 is 490.0Pa, and the pressure drop of a plate with a guide hole 201 is 500.0Pa. The plate pressure drop of flow hole 201 is 253.4Pa; at 10m / s, the experimental results show that the pressure drop of a single-layer plate without flow hole 201 is 925.0Pa, and the pressure drop of the plate with flow hole 201 is 210.0Pa; at 20m / s, the experimental results show that the pressure drop of a single-layer plate without flow hole 201 is 8570.0Pa, and the pressure drop of the plate with flow hole 201 is 4090.0Pa; this shows that adding flow hole 201 can significantly reduce the plate pressure drop.

[0037] It must be noted that the invention is described herein in terms of several most preferred embodiments. It should therefore be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various combinations or modifications of its features and several other applications included within the scope of the invention as defined by the appended claims. The features described in conjunction with the different embodiments may also be utilized in conjunction with other embodiments within the basic concept of the invention and / or combined in different combinations, if so desired and if there is a technical possibility for these.

Claims

1. A flow guide structure tower plate, comprising a tower plate body and openings on the plate body, characterized in that: A guide plate is arranged under the tower plate, and a guide hole is arranged on the guide plate. The upper part of the guide hole is correspondingly connected with the opening on the tower plate body, and the upper opening of the guide hole is small and the lower opening is large.

2. A flow guide structure tray according to claim 1, characterized in that: The openings on the plate body are circular openings and rectangular openings.

3. A flow guide structure tray according to claim 1, characterized in that: A cap is provided on the opening of the plate body.

4. A flow guide structure tray according to claim 1, characterized in that: The guide plate is a thin plate structure, and the corresponding positions of the guide plate and the tower plate body openings are bent upward to form a guide hole structure with a small upper opening and a large lower opening.

5. A plate tower with a flow guide structure, comprising a tower body and a downcomer, characterized in that: At least one flow-guiding structure tower plate as claimed in claims 1 to 4 is arranged in the tower body.

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