A hole-type sieve plate with high gas-liquid mass transfer rate

Abstract

The present invention provides a hole-shaped sieve plate with a high gas-liquid mass transfer rate, wherein a first special-shaped hole and a second special-shaped hole are arranged on the sieve plate, wherein the first special-shaped hole includes a central main hole 1, a peripheral bifurcated auxiliary hole 1, and an edge line type 1, and the second special-shaped hole includes a central main hole 2, a peripheral bifurcated auxiliary hole 2, a peripheral bifurcated auxiliary hole 3, and an edge line type 2, wherein the first special-shaped hole is arranged in two dimensions on the sieve plate in an equidistant symmetrical manner, and the second special-shaped hole is also arranged on the sieve plate in an equidistant symmetrical manner, and the second special-shaped hole is arranged in the gap after the first special-shaped hole is arranged. The present invention enhances the disturbance capacity of the airflow, can better break the reaction liquid into smaller droplets, increases the height of the foamy gas-liquid mixture above the sieve plate, increases the reaction intensity and reaction time of the gas-liquid reactants, and improves the efficiency of the reaction.

Description

Technical Field

[0001] The invention belongs to the technical field of gas-liquid mass transfer, and in particular relates to a hole-type sieve plate with a high gas-liquid mass transfer rate. Background Art

[0002] The porous sieve plate is a component for optimizing the mass transfer rate in the gas-liquid mass transfer reactor and is widely used in various sieve plate reaction towers. In the chemical industry, sieve plate reactors are used in various aspects such as distillation, absorption, desorption, stripping, extraction, cooling, etc., and their application areas cover all chemical fields such as basic chemistry, petrochemicals, and chemical fibers. In the field of environmental protection, such as in the flue gas wet desulfurization spray tower, the porous sieve plate is also used to enhance the flue gas desulfurization and dust removal effects.

[0003] The basic working principle of the sieve plate reaction tower is that the reaction gas flows upward from the bottom of the sieve plate through the sieve plate holes, while the reaction liquid sprays downward from the top of the sieve plate and flows downward through the sieve plate holes. The reaction gas and the reaction liquid meet at the openings on the sieve plate, the gas flows upward from the openings, and the liquid flows downward from the openings, and the two collide and mix with each other, generating a foamy boiling layer above the sieve plate, thereby increasing the contact area and mixing degree of the reaction gas and reaction liquid, improving the mass transfer rate between the reaction gas and the reaction liquid, and accelerating the reaction rate of the reactants contained in the gas and liquid.

[0004] The advantages of the sieve plate reaction tower are that the flow rate of the reaction gas and the reaction liquid is large and it is not easy to get clogged. It can be used in occasions that require a large flow rate, such as the flue gas wet desulfurization device mentioned above. Due to structural limitations, the disadvantages of the sieve plate reaction tower are that the reaction time is short and the reaction efficiency is low. In order to increase the reaction efficiency, it is sometimes necessary to increase the gas flow rate. At this time, it is necessary to increase the pressure difference of the gas above and below the sieve plate and increase the liquid spray flow rate, which increases the energy consumption of the reaction tower.

[0005] In addition, when the flow rates of the reaction gas and the reaction liquid change, the foamy boiling layer above the sieve plate may become unstable, which may deteriorate the efficiency of the gas-liquid reaction.

[0006] Therefore, a sieve plate reactor with higher mass transfer rate, lower energy consumption and larger stable working range is needed. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a hole-shaped sieve plate with a high gas-liquid mass transfer rate, and a first special-shaped hole and a second special-shaped hole are arranged on the sieve plate. The first special-shaped hole includes a central main hole one, a peripheral branching secondary hole one, and an edge line type one. The second special-shaped hole includes a central main hole two, a peripheral branching secondary hole two, a peripheral branching secondary hole three, and an edge line type two. The first special-shaped holes are arranged in two dimensions on the sieve plate in an equidistant and symmetrical manner, and the second special-shaped holes are also arranged on the sieve plate in an equidistant and symmetrical manner, and the second special-shaped holes are arranged in the gap after the first special-shaped holes are arranged.

[0008] Preferably, the number of the peripheral branched secondary holes 1 is four, and the four peripheral branched secondary holes 1 are respectively arranged at the upper, lower, left and right positions of the central main hole 1, and the edge line type 1 is arranged at the outer edge position of the peripheral branched secondary hole 1.

[0009] Preferably, the number of the outer branched secondary holes 2 and the outer branched secondary holes 3 are both multiple, and the outer branched secondary holes 2 and the outer branched secondary holes 3 are alternately arranged outside the central main hole 2, and the number of the edge line types 2 is multiple, and the multiple edge line types 2 are respectively arranged at the outer edge positions of the outer branched secondary holes 2 and the outer branched secondary holes 3.

[0010] Preferably, the shapes of the peripheral bifurcated auxiliary hole 1, the peripheral bifurcated auxiliary hole 2, and the peripheral bifurcated auxiliary hole 3 are all one of trapezoidal, rectangular, elliptical or teardrop-shaped.

[0011] Preferably, the shapes of the first central main hole and the second central main hole are circular holes, elliptical holes, square holes or rectangular holes.

[0012] Preferably, the characteristic lengths of the first central main hole and the second central main hole are both 5-50 mm.

[0013] Preferably, the length of the peripheral branched secondary hole 1 is 0.5-3 times the characteristic length of the central main hole 1.

[0014] Preferably, the shapes of the edge line type 1 and the edge line type 2 are both sawtooth, and the tooth top angles of the edge line type 1 and the edge line type 2 are both 30-120°, and the tooth side lengths are both 1-5 mm.

[0015] Preferably, the sizes of the second peripheral branching auxiliary hole and the third peripheral branching auxiliary hole are different, and the number of the second peripheral branching auxiliary hole and the third peripheral branching auxiliary hole is 2-4.

[0016] Preferably, the opening rate of the sieve plate is 0.2-0.5, and the ratio of the perimeter of the hole edge of the sieve plate opening to the hole area is 0.2-1.0 mm / mm 2 .

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention arranges the first special-shaped holes and the second special-shaped holes on the screen plate in an equidistant and symmetrical manner, wherein the first special-shaped holes and the second special-shaped holes are both composed of a central main hole and a peripheral branched auxiliary hole, and the edge line of the hole is set to a sawtooth shape. Under the same opening rate, this hole opening method greatly improves the ratio of the hole edge perimeter of the screen plate opening to the hole area. The ratio of the hole edge perimeter of the screen plate opening to the hole area is 2-5 times larger than that of the ordinary screen plate, which significantly increases the contact area of ​​the gas-liquid reactants, improves the mass transfer rate between the gas-liquid reactants, and improves the efficiency of the gas-liquid reaction.

[0019] 2. The present invention comprises a central main hole and a peripheral branched auxiliary hole to form a special-shaped hole, and the shapes and sizes of the two special-shaped holes are different, which enhances the disturbance ability of the airflow, can better break the reaction liquid into smaller droplets, increases the height of the foamy gas-liquid mixture above the sieve plate, increases the reaction intensity and reaction time of the gas-liquid reactants, and improves the reaction efficiency.

[0020] 3. The central main hole and the peripheral branched auxiliary holes of the present invention are formed at different positions of the sieve plate to form holes of different shapes and sizes, so that the foamy gas-liquid mixture above the sieve plate can remain stable in a larger range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a first special-shaped hole of the present invention;

[0022] Figure 2 is a schematic structural diagram of the second special-shaped hole of the present invention;

[0023] Figure 3 It is a schematic diagram of the opening structure of the sieve plate composed of the first special-shaped hole and the second special-shaped hole of the present invention;

[0024] Figure 4 It is a top view of the reaction tower sieve plate in Example 1 of the present invention.

[0025] In the figure:

[0026] 1. The first special-shaped hole; 11. The first central main hole; 12. The first peripheral branching auxiliary hole; 13. The first edge line shape; 2. The second special-shaped hole; 21. The second central main hole; 22. The second peripheral branching auxiliary hole; 23. The third peripheral branching auxiliary hole; 24. The second edge line shape. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings:

[0028] Example:

[0029] As attached Figure 1-3As shown, the present invention provides a hole-shaped sieve plate with a high gas-liquid mass transfer rate, wherein a first special-shaped hole 1 and a second special-shaped hole 2 are arranged on the sieve plate, wherein the first special-shaped hole 1 includes a central main hole 11, a peripheral branched auxiliary hole 12, and an edge line 13, wherein the number of the peripheral branched auxiliary holes 12 is four, and the four peripheral branched auxiliary holes 12 are respectively arranged at the upper, lower, left, and right positions of the central main hole 11, and the edge line 13 is arranged at the outer edge position of the peripheral branched auxiliary hole 12; the second special-shaped hole 2 includes a central main hole 21, a peripheral branched auxiliary hole 22, a peripheral branched auxiliary hole 3 23, an edge line 13, and a plurality of peripheral branched auxiliary holes 12. The number of the peripheral branched secondary holes 22 and the peripheral branched secondary holes 3 23 is multiple, and the peripheral branched secondary holes 22 and the peripheral branched secondary holes 3 23 are alternately arranged outside the central main hole 21. The number of the edge line type 24 is multiple, and the multiple edge line types 24 are respectively arranged at the outer edge positions of the peripheral branched secondary holes 22 and the peripheral branched secondary holes 3 23; the first special-shaped holes 1 are two-dimensionally arranged on the sieve plate in an equidistant and symmetrical manner, and the second special-shaped holes 2 are also arranged on the sieve plate in an equidistant and symmetrical manner, and the second special-shaped holes 2 are arranged in the gap after the first special-shaped holes 1 are arranged.

[0030] Specifically, the shapes of the peripheral branched auxiliary hole 12, the peripheral branched auxiliary hole 22, and the peripheral branched auxiliary hole 3 23 are all trapezoidal, rectangular, elliptical or teardrop-shaped.

[0031] Specifically, the shapes of the first central main hole 11 and the second central main hole 21 are both round holes, elliptical holes, square holes or rectangular holes.

[0032] Specifically, the characteristic lengths of the first central main hole 11 and the second central main hole 21 are both 5-50 mm.

[0033] Specifically, the length of the peripheral branched secondary hole 12 is 0.5-3 times the characteristic length of the central main hole 11.

[0034] Specifically, the shape of the edge line type 1 13 and the edge line type 2 24 are both sawtooth, and the tooth top angles of the edge line type 1 13 and the edge line type 2 24 are both 30-120°, and the tooth side lengths are both 1-5 mm.

[0035] Specifically, the sizes of the second peripheral branching auxiliary hole 22 and the third peripheral branching auxiliary hole 23 are different, and the number of the second peripheral branching auxiliary hole 22 and the third peripheral branching auxiliary hole 23 is 2-4.

[0036] Specifically, the opening rate of the sieve plate is 0.2-0.5, and the ratio of the perimeter of the hole edge of the sieve plate opening to the hole area is 0.2-1.0 mm / mm 2 .

[0037] Embodiment 1:

[0038] As attached Figure 4 As shown, the sieve plate of the present invention is used in a wet desulfurization spray tower:

[0039] The wet desulfurization spray tower has a vertical cylindrical tower body with an atomizing spray nozzle on the top of the tower body, spraying CaCO 3 The boiler flue gas enters from the lower part of the tower, and the SO in the flue gas 2 With CaCO in the spray slurry 3 Reaction to generate CaSO 3 , CaSO 3 The slurry pool that falls into the bottom of the tower reacts with the oxygen that is blown into the slurry pool to produce CaSO 4 ·H 2 O, and then be recycled. After the reaction, SO in the flue gas 2 The content is reduced to the level required by environmental protection standards.

[0040] The sieve plate with the hole type of the present invention is installed in the middle of the desulfurization tower, above the flue gas inlet and below the slurry spray nozzle. The flue gas and the sprayed slurry meet at the sieve plate, and the mixture of the flue gas and the slurry forms a foamy boiling reaction layer above the sieve plate, so that the SO2 in the flue gas reacts with the CaCO3 in the slurry to remove the sulfide contained in the flue gas. Practice shows that the sieve plate with the hole type of the present invention can still improve the desulfurization rate of the flue gas and reduce the sulfide content in the exhaust flue gas while reducing the flue gas inlet pressure and the slurry spray flow rate.

[0041] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0043] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A perforated sieve plate with high gas-liquid mass transfer rate, characterized in that: A first special-shaped hole (1) and a second special-shaped hole (2) are arranged on the sieve plate. The first special-shaped hole (1) includes a central main hole (11), a peripheral branched auxiliary hole (12), and an edge line (13). The second special-shaped hole (2) includes a central main hole (21), a peripheral branched auxiliary hole (22), a peripheral branched auxiliary hole (23), and an edge line (24). The first special-shaped holes (1) are arranged in two dimensions on the sieve plate in an equidistant and symmetrical manner. The second special-shaped holes (2) are also arranged on the sieve plate in an equidistant and symmetrical manner. The second special-shaped holes (2) are arranged in the gap after the first special-shaped holes (1) are arranged.

2. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The number of the peripheral branched auxiliary holes (12) is four, and the four peripheral branched auxiliary holes (12) are respectively arranged at the upper, lower, left and right positions of the central main hole (11), and the edge line type (13) is arranged at the outer edge position of the peripheral branched auxiliary hole (12).

3. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The number of the peripheral branched secondary holes 2 (22) and the peripheral branched secondary holes 3 (23) are both multiple, and the peripheral branched secondary holes 2 (22) and the peripheral branched secondary holes 3 (23) are respectively arranged alternately outside the central main hole 2 (21); the number of the edge line types 2 (24) is multiple, and the multiple edge line types 2 (24) are respectively arranged at the outer edge positions of the peripheral branched secondary holes 2 (22) and the peripheral branched secondary holes 3 (23).

4. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The shapes of the peripheral branched auxiliary hole 1 (12), the peripheral branched auxiliary hole 2 (22), and the peripheral branched auxiliary hole 3 (23) are all one of a trapezoid, a rectangle, an ellipse or a teardrop shape.

5. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The shapes of the central main hole 1 (11) and the central main hole 2 (21) are both round holes, elliptical holes, square holes or rectangular holes.

6. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The characteristic lengths of the central main hole 1 (11) and the central main hole 2 (21) are both 5-50 mm.

7. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The length of the peripheral branched secondary hole (12) is 0.5-3 times the characteristic length of the central main hole (11).

8. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The shapes of the edge line type 1 (13) and the edge line type 2 (24) are both sawtooth-shaped, and the tooth top angles of the edge line type 1 (13) and the edge line type 2 (24) are both 30-120°, and the tooth side lengths are both 1-5 mm.

9. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The sizes of the second peripheral branching auxiliary hole (22) and the third peripheral branching auxiliary hole (23) are different, and the number of the second peripheral branching auxiliary hole (22) and the third peripheral branching auxiliary hole (23) are both 2-4.

10. A perforated sieve plate with high gas-liquid mass transfer rate as claimed in claim 1, characterized in that: The opening rate of the sieve plate is 0.2-0.5, and the ratio of the perimeter of the hole edge of the sieve plate opening to the hole area is 0.2-1.0 mm / mm 2 .

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