Semi-dry humidification desulfurization tower

Abstract

The utility model relates to the technical field of desulfurizing towers, in particular to a semi-dry humidifying desulfurizing tower which comprises a smoke inlet flue, a venturi slow descending flue, a straight tube slow descending flue and a waste bin which are communicated in sequence, the smoke inlet flue is provided with a smoke inlet, the smoke inlet flue is sequentially provided with a first flow equalizing part and a second flow equalizing part, the first flow equalizing part is arranged at the smoke inlet, and the second flow equalizing part is arranged at the joint of the smoke inlet flue and the venturi slow descending flue; a desulfurizing agent spraying device is arranged at the top of the venturi slow descending flue, and the venturi slow descending flue is further provided with a venturi tube bundle; a first slow descending net, a second slow descending net and a third slow descending net are sequentially arranged on the straight-barrel slow descending flue from top to bottom; and a smoke outlet is further formed in one side of the bottom of the straight-barrel slow descending flue. By arranging the multiple layers of flow equalizing devices and the multiple layers of slow descending devices, it is ensured that flue gas can uniformly flow through all areas in the tower, meanwhile, the flow speed of the flue gas is reduced, the residence time of the flue gas in the desulfurization tower is prolonged, and the desulfurization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a desulfurization tower technical field especially relates to a semi-dry method humidification desulfurization tower. BACKGROUND

[0002] The existing semi-dry method humidification desulfurization tower as a kind of environmental protection equipment widely used in industrial flue gas treatment, its main function is by spraying into the flue gas with appropriate desulfurizer (such as lime milk, slaked lime etc.), in tower with the chemical reaction of sulfur dioxide (SO2) in flue gas, generate harmless substances such as sulfate, to achieve the purpose of reducing sulfur dioxide emission concentration in flue gas. However, when flue gas enters desulfurization tower at faster speed, flue gas often presents uneven distribution state, not only makes the flue gas concentration of partial area too high, causes the rapid consumption and blockage of desulfurizer in the area, simultaneously also makes the flue gas concentration of other area too low, and desulfurizer cannot be fully utilized. In addition, flue gas passes through in tower quickly can lead to the residence time of flue gas in tower too short, lead to the reaction time of desulfurizer and flue gas greatly shorten, and the shortage of reaction time directly leads to the decline of desulfurization efficiency, so that sulfur dioxide and other pollutants in flue gas cannot be fully removed. Therefore, it is necessary to make improvement to prior art to solve the above problems. SUMMARY

[0003] The utility model aims at providing a semi-dry method humidification desulfurization tower, to solve the problem of uneven distribution and fast through in the desulfurization tower in prior art.

[0004] In order to achieve the above purpose, the utility model provides a semi-dry method humidification desulfurization tower, including the smoke flue that communicates in proper order, venturi slow descending flue, straight cylinder slow descending flue and waste bin;The smoke flue is provided with smoke inlet, and the smoke flue is provided with first flow uniforming spare and second flow uniforming spare in proper order, and the first flow uniforming spare is arranged at the smoke inlet, and the second flow uniforming spare is arranged at the junction of the smoke flue and venturi slow descending flue;The top of venturi slow descending flue is provided with desulfurizer spraying device, and venturi slow descending flue is also provided with venturi tube bundle;Straight cylinder slow descending flue is provided with first slow descending net, second slow descending net and third slow descending net in proper order from top to bottom;The bottom side of straight cylinder slow descending flue is also provided with smoke outlet.

[0005] Further, the smoke flue includes first smoke straight cylinder pipe section, smoke convergent pipe section, second smoke straight cylinder pipe section, smoke elbow pipe section and smoke diffusion connecting pipe section that communicate in proper order;The smoke inlet is arranged at the first smoke straight cylinder pipe section, and the first flow uniforming spare is the descending ladder structure and is arranged at the first smoke straight cylinder pipe section, and the second flow uniforming spare is the ascending ladder structure and is arranged at the smoke diffusion connecting pipe section.

[0006] Further, the first flow equalizing member and the second flow equalizing member are each provided with a plurality of flow equalizing plates, the distance D1 between adjacent flow equalizing plates is 290-300 mm, the height difference H1 between adjacent flow equalizing plates is 145-155 mm, the height H2 of each flow equalizing plate is 1150-1250 mm, and the thickness T1 is 15-25 mm.

[0007] Further, the Venturi slow descent flue comprises, in sequence, a first slow descent straight cylinder pipe section, a slow descent converging pipe section, a second slow descent straight cylinder pipe section and a slow descent diffuser pipe section; the Venturi tube bundle is arranged in the second slow descent straight cylinder pipe section.

[0008] Further, the Venturi tube bundle is provided with a plurality of Venturi tubes, one of which is located at the center, and the rest are distributed around the center.

[0009] Further, the first slow descent net is a gradually expanding conical structure, and the first slow descent net is provided with a plurality of slow descent perforations.

[0010] Further, the diameter of the slow descent perforation is 290-310 mm.

[0011] Further, the second slow descent net and the third slow descent net are both net structures; the second slow descent net and the third slow descent net each comprise an upper layer of horizontal grids and a lower layer of vertical grids; the distance D2 between the upper layer of horizontal grids and the lower layer of vertical grids is 420-450 mm.

[0012] Further, the upper layer of horizontal grids is provided with a plurality of horizontal bars, and the plurality of horizontal bars are arranged equidistantly and in parallel; the lower layer of vertical grids is provided with a plurality of vertical bars, and the plurality of vertical bars are arranged equidistantly and in parallel; the distance D3 between adjacent horizontal bars is equal to the distance D4 between adjacent vertical bars.

[0013] Further, the distance D3 and the distance D4 are both 140-150 mm.

[0014] Compared with the prior art, in the semi-dry method humidifying desulfurization tower, flue gas enters the flue from the smoke inlet, sequentially flows through the first flow equalizing member and the second flow equalizing member, the first flow equalizing member performs primary distribution on the flue gas entering the desulfurization tower, then the second flow equalizing member performs secondary distribution on the flue gas, then when the flue gas enters the Venturi slow descent flue from the smoke flue, the desulfurizing agent spraying device sprays the desulfurizing agent, the flue gas and the desulfurizing agent sequentially pass through the Venturi tube bundle, the first slow descent net, the second slow descent net and the third slow descent net, and finally the flue gas is discharged from the smoke outlet and enters the next process. By arranging the multi-layer flow equalizing device, it is ensured that the flue gas can uniformly flow through each region in the tower, thereby providing guarantee for subsequent desulfurization reaction; by arranging the multi-layer slow descent device, the flow rate of the flue gas is reduced, the residence time of the flue gas in the desulfurization tower is prolonged, thereby increasing the reaction time of the flue gas and the desulfurizing agent, making the desulfurization reaction more sufficient, and improving the desulfurization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a sectional view of the utility model;

[0016] Figure 2 is a sectional view of the utility model;

[0017] Figure 3 is Figure 2 is an enlarged structural schematic view of part A in the middle;

[0018] Figure 4 is Figure 2 is an enlarged structural schematic view of part B in the middle;

[0019] Figure 5 is Figure 2 is an enlarged structural schematic view of part C in the middle;

[0020] Figure 6 is a three-dimensional structural schematic view of the first slow descent net;

[0021] Figure 7 is a plan view of the second slow descent net.

[0022] BRIEF DESCRIPTION OF DRAWINGS:

[0023] 1, the smoke inlet flue; 11, the smoke inlet; 12, the first flow uniforming piece; 121, the flow uniforming plate; 13, the second flow uniforming piece; 14, the first smoke inlet straight cylinder pipe section; 15, the smoke inlet contraction pipe section; 16, the second smoke inlet straight cylinder pipe section; 17, the smoke inlet elbow pipe section; 18, the smoke inlet diffusion connecting pipe section;

[0024] 2, the Venturi slow descent flue; 21, the Venturi pipe bundle; 211, the Venturi pipe; 22, the first slow descent straight cylinder pipe section; 23, the slow descent contraction pipe section; 24, the second slow descent straight cylinder pipe section; 25, the slow descent diffusion pipe section;

[0025] 3, the straight cylinder slow descent flue; 31, the first slow descent net; 311, the slow descent perforation; 32, the second slow descent net; 321, the upper layer horizontal grid; 322, the lower layer vertical grid; 323, the horizontal strip; 324, the vertical strip; 33, the third slow descent net; 34, the smoke outlet;

[0026] 4, the waste bin. DETAILED DESCRIPTION

[0027] The utility model will be described in detail below in combination with specific embodiments.

[0028] In this utility model, unless otherwise explicitly specified and limited, when terms such as "set in," "connected," or "linked" appear, these terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The directional terms appearing in this utility model are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the placement direction of this utility model changes, the direction of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute limitation on the characteristics of the features and the relationships between them in space, but only a relative limitation.

[0029] This utility model provides a semi-dry humidification desulfurization tower, such as Figures 1 to 7 As shown, it includes a flue gas inlet duct 1, a venturi descending flue duct 2, a straight descending flue duct 3, and a waste bin 4 connected in sequence. The flue gas inlet duct 1 is provided with a flue gas inlet 11. The flue gas inlet duct 1 is provided with a first flow equalizer 12 and a second flow equalizer 13 in sequence. The first flow equalizer 12 is located at the flue gas inlet 11, and the second flow equalizer 13 is located at the connection between the flue gas inlet duct 1 and the venturi descending flue duct 2. The top of the venturi descending flue duct 2 is provided with a desulfurizing agent spraying device, and the venturi descending flue duct 2 is also provided with a venturi tube bundle 21. The straight descending flue duct 3 is provided with a first descending net 31, a second descending net 32, and a third descending net 33 in sequence from top to bottom. The bottom side of the straight descending flue duct 3 is also provided with a flue gas outlet 34.

[0030] Based on the above structural configuration, the flue gas enters the flue gas duct 1 from the inlet 11 and flows sequentially through the first flow equalization element 12 and the second flow equalization element 13. The first flow equalization element 12 performs the initial distribution of the flue gas entering the desulfurization tower. Subsequently, the second flow equalization element 13 performs the secondary distribution of the flue gas. Then, when the flue gas enters the Venturi slow-falling flue duct 2 from the flue gas duct 1, the desulfurizing agent spraying device sprays the desulfurizing agent. The flue gas and the desulfurizing agent pass sequentially through the Venturi tube bundle 21, the first slow-falling net 31, the second slow-falling net 32 ​​and the third slow-falling net 33. Finally, the desulfurized flue gas is discharged from the outlet 34 and enters the next process, and the reaction waste falls into the waste bin 4. By setting up a multi-layer flow equalization device, it is ensured that the flue gas can flow evenly through all areas of the tower, providing a guarantee for the subsequent desulfurization reaction. By setting up a multi-layer slow-descent device, the flow rate of the flue gas is reduced, and the residence time of the flue gas in the desulfurization tower is extended, thereby increasing the reaction time between the flue gas and the desulfurizing agent, making the desulfurization reaction more complete and improving the desulfurization efficiency.

[0031] In the embodiment, the smoke inlet flue 1 comprises a first smoke inlet straight cylinder section 14, a smoke inlet contraction cylinder section 15, a second smoke inlet straight cylinder section 16, a smoke inlet elbow section 17 and a smoke inlet diffusion connecting cylinder section 18 which are sequentially communicated; the smoke inlet 11 is arranged in the first smoke inlet straight cylinder section 14, the first flow uniformizing member 12 is arranged in the first smoke inlet straight cylinder section 14 and has a descending ladder structure, and the second flow uniformizing member 13 is arranged in the smoke inlet diffusion connecting cylinder section 18 and has an ascending ladder structure. Through the ladder structure, the flue gas is preliminarily uniformly distributed when flowing through the first flow uniformizing member 12, and the second flow uniformizing member 13 further uniformly distributes the flue gas on the basis of the first flow uniformizing member 12, so that the flue gas is more uniformly distributed in the desulfurization tower, and the subsequent desulfurization reaction can be more fully carried out.

[0032] In the embodiment, the first flow uniformizing member 12 and the second flow uniformizing member 13 are both provided with a plurality of flow uniformizing plates 121, the distance D1 between adjacent flow uniformizing plates 121 is 290-300 mm, preferably 295 mm, the height difference H1 between adjacent flow uniformizing plates 121 is 145-155 mm, preferably 150 mm, the height H2 of each flow uniformizing plate 121 is 1150-1250 mm, preferably 1200 mm, and the thickness T1 is 15-25 mm, preferably 20 mm. Through the above structure and parameter design, the flue gas in the tower can be uniformly distributed, so that the flue gas and the desulfurizing agent are more fully contacted and reacted, and the desulfurization efficiency is improved.

[0033] In the embodiment, the Venturi slow descent flue 2 comprises a first slow descent straight cylinder section 22, a slow descent contraction cylinder section 23, a second slow descent straight cylinder section 24 and a slow descent diffusion cylinder section 25 which are sequentially communicated; and the Venturi tube bundle 21 is arranged in the second slow descent straight cylinder section 24. When the flue gas enters the second slow descent straight cylinder section 24 through the slow descent contraction cylinder section 23, the flow rate is significantly increased, and the static pressure is correspondingly reduced, which is helpful for the flue gas and the desulfurizing agent to be fully mixed in the Venturi tube bundle 21 in the second slow descent straight cylinder section 24.

[0034] In the embodiment, the Venturi tube bundle 21 is provided with a plurality of Venturi tubes 211, one of which is located at the center position, and the remaining Venturi tubes 211 are uniformly distributed around. Since the Venturi tube bundle 21 is provided with a plurality of Venturi tubes 211, the contact area between the desulfurizing agent and the flue gas is increased, so that the desulfurizing agent can more fully contact and react with the sulfur dioxide in the flue gas, and the desulfurization efficiency is further improved. In the embodiment, the first slow descent net 31 has a gradually expanding conical structure, and the first slow descent net 31 is provided with a plurality of slow descent perforations 311.

[0035] In the embodiment, the diameter of the slow descent perforation 311 is 290-310 mm, preferably 300 mm.

[0036] Through the above structure and parameter design, the first slow descending net 31 can effectively guide the flue gas to flow in the tower, so that the flue gas stays in the tower for a longer time, increases the contact area and contact time of the flue gas and the desulfurizing agent, helps to improve the desulfurization efficiency, and ensures that the sulfur dioxide in the flue gas is more effectively removed.

[0037] In the embodiment, the second slow descending net 32 and the third slow descending net 33 are both in a net structure; the second slow descending net 32 and the third slow descending net 33 each include an upper layer of horizontal lattices 321 and a lower layer of vertical lattices 322; the distance D2 between the upper layer of horizontal lattices 321 and the lower layer of vertical lattices 322 is 420-450mm, preferably 443mm. The layout of the upper layer of horizontal lattices 321 and the lower layer of vertical lattices 322 makes the flue gas form a multi-level flow path in the tower, increases the contact area and contact time of the flue gas and the desulfurizing agent, helps the sulfur dioxide in the flue gas to fully react with the desulfurizing agent, and improves the desulfurization efficiency.

[0038] In the embodiment, the upper layer of horizontal lattices 321 is provided with a plurality of horizontal bars 323, and the plurality of horizontal bars 323 are arranged equidistantly and in parallel; the lower layer of vertical lattices 322 is provided with a plurality of vertical bars 324, and the plurality of vertical bars 324 are arranged equidistantly and in parallel; the distance D3 between adjacent horizontal bars 323 is equal to the distance D4 between adjacent vertical bars 324, and further preferably, the distance D3 and the distance D4 are both 140-150mm, preferably 143mm. Through reasonable arrangement of the horizontal bars 323 and the vertical bars 324, the airflow distribution in the desulfurization tower can be optimized, so that the desulfurizing agent and the flue gas can be more fully contacted and reacted.

[0039] In summary, the semi-dry method humidification desulfurization tower can solve the problem of fast passing and uneven distribution of flue gas in the desulfurization tower in the prior art.

[0040] In the case of no conflict, the above embodiments and features in the embodiments can be combined with each other.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A semi-dry humidification desulfurization tower, characterized in that: It includes a flue gas inlet (1), a venturi descending flue (2), a straight descending flue (3), and a waste bin (4) connected in sequence; a flue gas inlet (11) is provided on one side of the bottom of the flue gas inlet (1), and a first flow equalization element (12) and a second flow equalization element (13) are provided in the flue gas inlet (11), and the second flow equalization element (13) is provided at the connection between the flue gas inlet (1) and the venturi descending flue (2); a desulfurizing agent spraying device is provided at the top of the venturi descending flue (2), and a venturi tube bundle (21) is also provided in the venturi descending flue (2); a first descending net (31), a second descending net (32), and a third descending net (33) are provided in sequence from top to bottom in the straight descending flue (3); a flue gas outlet (34) is also provided on one side of the bottom of the straight descending flue (3).

2. The semi-dry humidification desulfurization tower according to claim 1, characterized in that: The flue (1) includes a first inlet straight pipe section (14), an inlet shrink pipe section (15), a second inlet straight pipe section (16), an inlet bend pipe section (17), and an inlet diffuser connecting pipe section (18) connected in sequence; the inlet (11) is located in the first inlet straight pipe section (14), the first flow equalization element (12) is a descending stepped structure and is located in the first inlet straight pipe section (14), and the second flow equalization element (13) is an ascending stepped structure and is located in the inlet diffuser connecting pipe section (18).

3. The semi-dry humidification desulfurization tower according to claim 2, characterized in that: The first flow equalization element (12) and the second flow equalization element (13) are each provided with multiple flow equalization plates (121). The distance D1 between adjacent flow equalization plates (121) is 290-300mm; the height difference H1 between adjacent flow equalization plates (121) is 145-155mm; the height H2 of each flow equalization plate (121) is 1150-1250mm, and the thickness T1 is 15-25mm.

4. The semi-dry humidification desulfurization tower according to claim 1, characterized in that: The Venturi slow-descent flue (2) includes a first slow-descent straight pipe section (22), a slow-descent contraction pipe section (23), a second slow-descent straight pipe section (24), and a slow-descent diffusion pipe section (25) connected in sequence; the Venturi tube bundle (21) is located in the second slow-descent straight pipe section (24).

5. The semi-dry humidification desulfurization tower according to claim 4, characterized in that: The Venturi tube bundle (21) is provided with multiple Venturi tubes (211), one of which is located at the center and the rest of the Venturi tubes (211) are distributed around the circumference.

6. The semi-dry humidification desulfurization tower according to claim 1, characterized in that: The first deceleration net (31) is a gradually expanding conical structure, and the first deceleration net (31) is provided with multiple deceleration perforations (311).

7. The semi-dry humidification desulfurization tower according to claim 6, characterized in that: The diameter of the slow-descent perforation (311) is 290-310 mm.

8. The semi-dry humidification desulfurization tower according to claim 1, characterized in that: The second descent mesh (32) and the third descent mesh (33) are both mesh structures; the second descent mesh (32) and the third descent mesh (33) each include an upper horizontal grid (321) and a lower vertical grid (322); the distance D2 between the upper horizontal grid (321) and the lower vertical grid (322) is 420-450mm.

9. The semi-dry humidification desulfurization tower according to claim 8, characterized in that: The upper horizontal grid (321) has multiple horizontal bars (323) arranged in parallel at equal intervals; the lower vertical grid (322) has multiple vertical bars (324) arranged in parallel at equal intervals; the distance D3 between adjacent horizontal bars (323) is equal to the distance D4 between adjacent vertical bars (324).

10. The semi-dry humidification desulfurization tower according to claim 9, characterized in that: The distances to D3 and D4 are both 140-150mm.

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