Combined washing tower with tail gas desulfurization pre-absorption structure

Abstract

The utility model relates to the technical field of desulfurization of combined washing towers, and discloses a combined washing tower with a tail gas desulfurization pre-absorption structure, which comprises a combined washing tower and an absorption tower arranged on the right side of the combined washing tower. According to the combined washing tower with the tail gas desulfurization pre-absorption structure, the reverse spraying pre-absorption section is additionally arranged, so that the SO2 absorption efficiency can be improved, downward radial flow flue gas and upward spraying under-rich amine liquid are subjected to variable flow state turbulent bubble type contact to form a gas-in-liquid SO2 absorption reaction, and after the flue gas and spraying liquid are subjected to the variable flow state turbulent bubble type contact reaction, the SO2 absorption efficiency is improved. The gas-liquid mixture downwards enters a lower absorption chamber of the organic amine desulfurization tower for gas-liquid separation, so that the pre-absorption operation is completed, the desulfurization efficiency can be effectively improved, the emission of SO2 in tail gas is reduced, the risk of environmental protection accidents is avoided, meanwhile, the sulfur utilization rate is effectively improved, and better economic benefits are generated; the problems that the desulfurization efficiency is low, and tail gas exceeds the standard seriously are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of combined scrubbing tower desulfurization, in particular to a combined scrubbing tower with a tail gas desulfurization pre-absorption structure. Background Art

[0002] Desulfurization is a technical process that removes sulfide compounds (such as sulfur dioxide) produced during combustion through chemical or physical methods. It is mainly used in industries such as coal combustion, industrial production and power generation.

[0003] The combined scrubber is an exhaust gas treatment device that combines the functions of a spray tower and a packed tower. Combining the advantages of both, it purifies exhaust gas through full contact between the exhaust gas and the spray absorbent, and is widely used in desulfurization systems.

[0004] During the production process of the desulfurization system, gas distribution can ensure that the liquid sulfur dioxide output meets the standards. However, while ensuring the output of liquid sulfur dioxide, the exhaust gas emission indicators of the desulfurization system are difficult to meet the standards.

[0005] When the SO2 concentration at the desulfurization system inlet is 9000-10600ppm, i.e. 25714-30285mg / m³, and the gas volume is 85,000 Nm3 / h~95,000 Nm3 / h, one compressor can run at full load, and the exhaust emissions can basically be controlled within the range of 50~600mg / m³. However, this cannot meet the production requirements, resulting in low output.

[0006] If the inlet SO2 concentration exceeds 10600ppm (i.e. 30285mg / m³), the tail gas will immediately exceed the standard. If the production is completed, the tail gas will seriously exceed the standard, affecting and polluting the surrounding environment, resulting in a poor surrounding environment, low desulfurization efficiency, and shortcomings. Utility Model Content

[0007] The purpose of the utility model is to provide a combined scrubbing tower with a tail gas desulfurization pre-absorption structure to solve the problem of low desulfurization efficiency and serious tail gas exceeding the standard proposed in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a combined washing tower with a tail gas desulfurization pre-absorption structure, comprising a washing combination tower and an absorption tower, an absorption tower being arranged on the right side of the washing combination tower, a first flue being fixedly installed on the top of the washing combination tower, a second flue being fixedly arranged on the bottom end of the left side of the absorption tower, a connecting flue being arranged between the first flue and the second flue, a liquid separation pipe being arranged at the top inside the second flue, a stainless steel spiral nozzle being fixed on the top of the liquid separation pipe, brackets being fixed on both sides of the bottom end of the liquid separation pipe, a pre-absorption pump being arranged between the washing combination tower and the absorption tower, an input pipe being fixed to the input end of the pre-absorption pump, an output pipe being fixed to the output end of the pre-absorption pump, a first steel frame being fixed to the outside of the washing combination tower, a second steel frame being fixed to the outside of the absorption tower, and an operating platform being fixed between the first steel frame and the second steel frame.

[0009] Furthermore, the washing combination tower is connected to the interior of the first flue, the first flue is connected to the interior of the second flue through a connecting flue, and the second flue is connected to the interior of the absorption tower.

[0010] Furthermore, the right side of the output pipe passes through the interior of the left side of the second flue and is fixedly connected to the left side of the liquid separation pipe.

[0011] Furthermore, ten groups of stainless steel spiral nozzles are fixed in a circular manner at equal intervals on the top of the liquid separation tube, one side of the bracket is fixedly connected to one side inside the second flue, and the bracket is symmetrically arranged about the vertical center line of the liquid separation tube.

[0012] Preferably, the bottom ends of the first flue and the outside of the connecting flue are respectively welded and fixed with a first connecting flange, and the top ends of the outsides of the connecting flue and the second flue are respectively welded and fixed with a second connecting flange, the bottom end of the second connecting flange is provided with a connecting bolt, the top end of the first connecting flange is provided with a connecting nut, and the interiors of the first connecting flange and the second connecting flange are respectively provided with multiple groups of through holes.

[0013] Furthermore, the connecting bolts and connecting nuts are respectively arranged in a ring at equal intervals at the bottom end of the second connecting flange and the top end of the first connecting flange, and the top ends of the connecting bolts respectively pass through the interior of the second connecting flange and the first connecting flange, and the connecting nuts are rotatably connected to the outside of the connecting bolts.

[0014] Preferably, a mounting slot is provided inside the top end of the connecting flue, and a mounting ring is provided inside the mounting slot, and a filter is fixed inside the mounting ring.

[0015] Preferably, a gas pipe is fixed to the bottom end of the left side of the washing combination tower, a first base is fixed to the bottom end of the washing combination tower, and a second base is fixed to the bottom end of the absorption tower.

[0016] Compared with the existing technology, the beneficial effects of the present invention are: the combined scrubber with the tail gas desulfurization pre-absorption structure not only effectively improves the desulfurization efficiency and reduces the SO2 emission in the tail gas, but also facilitates the disassembly, cleaning and maintenance of the flue gas conveying pipeline of the combined scrubber, and facilitates the auxiliary filtration of particulate matter contained in the flue gas;

[0017] A washing combination tower, a first steel frame, a first flue, a connecting flue, a liquid separator, a bracket, an operating platform, an output pipe, a second flue, a pre-absorption pump, an input pipe, a second steel frame and a stainless steel spiral nozzle are provided. A liquid separator is installed in the second flue, and ten groups of stainless steel spiral nozzles are fixed at equal intervals on the top of the liquid separator, which can spray the under-enriched amine liquid pumped into the stainless steel spiral nozzle upward. A reverse spray pre-absorption section is added in the middle of the flue gas pipeline from the tail gas desulfurization washing combination tower to the absorption tower to increase the SO2 absorption efficiency. The downward radially flowing flue gas and the upwardly sprayed under-enriched amine liquid are contacted in a variable flow turbulent bubble manner to form a liquid-in-gas type SO2 absorption reaction. After the flue gas and the spraying liquid are contacted in a variable flow turbulent bubble manner, the gas-liquid mixture descends into the lower absorption chamber of the organic amine desulfurization tower for gas-liquid separation, thereby completing the pre-absorption operation. The pre-absorption process does not generate any new waste acid, sewage, or exhaust gas emissions, and can effectively improve desulfurization efficiency and reduce SO2 emissions in tail gas, thus avoiding the risk of environmental accidents and reducing environmental pollution. At the same time, it effectively improves sulfur utilization and generates better economic benefits.

[0018] By providing a first flue, a connecting flue, a second flue, a first connecting flange, a connecting nut, a second connecting flange and connecting bolts, the first flue, the connecting flue and the second flue provided in the combined scrubbing tower can be used to convey sulfur-containing flue gas by unscrewing the connecting nut from the outside of the connecting bolt at the top end of the first connecting flange, and after the connecting bolts are pulled out and disassembled from the second connecting flange and the first connecting flange, the connecting flue can be removed from between the first flue and the second flue. The split-structure flue gas duct is convenient for disassembly, assembly, cleaning and maintenance of the interior of the flue gas conveying duct of the combined scrubbing tower;

[0019] By providing a connecting flue, an installation slot, a mounting ring and a filter screen, when the flue gas duct is used in a combined washing tower, a mounting ring can be installed inside the top of the connecting flue. Through the filter screen fixed inside the mounting ring, some particulate impurities contained in the conveyed flue gas can be assisted to be filtered and removed, thereby reducing the impurity content in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present utility model;

[0021] Figure 2 This is a schematic diagram of the enlarged structure of the stainless steel spiral nozzle of the utility model from a top view;

[0022] Figure 3 This is a front view enlarged structural diagram of the first connecting flange of the present invention;

[0023] Figure 4 This is a schematic diagram of an enlarged partial cross-section of the mounting ring of the present invention.

[0024] In the figure: 1. First base; 2. Washing combination tower; 3. First steel frame; 4. Gas transmission pipe; 5. First flue; 6. Connecting flue; 7. Liquid distribution pipe; 8. Bracket; 9. Operating platform; 10. Output pipe; 11. Second flue; 12. Pre-absorption pump; 13. Input pipe; 14. Absorption tower; 15. Second base; 16. Second steel frame; 17. Stainless steel spiral nozzle; 18. First connecting flange; 19. Connecting nut; 20. Second connecting flange; 21. Connecting bolt; 22. Mounting slot; 23. Mounting ring; 24. Filter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0026] See also Figure 1-4 , a combined washing tower with a tail gas desulfurization pre-absorption structure, comprising a washing combined tower 2 and an absorption tower 14, the absorption tower 14 is arranged on the right side of the washing combined tower 2, a first flue 5 is fixed on the top of the washing combined tower 2, a second flue 11 is fixed at the bottom end of the left side of the absorption tower 14, a connecting flue 6 is arranged between the first flue 5 and the second flue 11, a liquid separation pipe 7 is arranged at the top inside the second flue 11, and a stainless steel spiral nozzle 17 is fixed on the top of the liquid separation pipe 7, and brackets 8 are respectively fixed on both sides of the bottom end of the liquid separation pipe 7, a pre-absorption pump 12 is arranged between the washing combined tower 2 and the absorption tower 14, and an input pipe 13 is fixed to the input end of the pre-absorption pump 12, and an output pipe 10 is fixed to the output end of the pre-absorption pump 12, a first steel frame 3 is fixed to the outside of the washing combined tower 2, a second steel frame 16 is fixed to the outside of the absorption tower 14, and an operating platform 9 is fixed between the first steel frame 3 and the second steel frame 16;

[0027] The scrubbing combination tower 2 is connected to the interior of the first flue 5, which is connected to the interior of the second flue 11 via the connecting flue 6. The second flue 11 is connected to the interior of the absorption tower 14. The right side of the output pipe 10 passes through the interior of the left side of the second flue 11 and is fixedly connected to the left side of the liquid separation pipe 7. Ten groups of stainless steel spiral nozzles 17 are fixed in an annular manner at equal intervals at the top of the liquid separation pipe 7. One side of the bracket 8 is fixedly connected to one side of the interior of the second flue 11. The bracket 8 is symmetrically arranged about the vertical centerline of the liquid separation pipe 7.

[0028] Specifically, if Figure 1 and Figure 2 As shown, a liquid distributor 7 is installed in the second flue 11, and ten groups of stainless steel spiral nozzles 17 are fixed at equal intervals at the top of the liquid distributor 7, which can spray the less-enriched amine liquid pumped into the stainless steel spiral nozzles 17 upward. By adding a reverse spray pre-absorption section in the middle of the flue gas pipeline from the exhaust gas desulfurization and washing combination tower 2 to the absorption tower 14, the SO2 absorption efficiency can be increased. The downward radial flue gas and the upward sprayed less-enriched amine liquid are subjected to variable flow turbulent bubble contact to form a liquid-in-gas absorption SO2 reaction. After the flue gas and the spray liquid undergo variable flow turbulent bubble contact reaction, the gas-liquid mixture descends into the lower absorption chamber of the organic amine desulfurization tower for gas-liquid separation, thereby completing the pre-absorption operation. The pre-absorption process does not generate any additional waste acid, sewage, or waste gas emissions, and can effectively improve the desulfurization efficiency and reduce SO2 emissions in the exhaust gas.

[0029] The excess capacity of rich amine liquid to absorb SO2 is utilized, and the flue gas is pre-sprayed to enhance the absorption effect.

[0030] Increasing the SO32+ concentration per unit volume of rich amine solution is more conducive to increasing sulfur dioxide production. Example 2

[0031] A first connecting flange 18 is welded and fixed to the bottom ends of the outsides of the first flue 5 and the connecting flue 6, respectively. A second connecting flange 20 is welded and fixed to the top ends of the outsides of the connecting flue 6 and the second flue 11, respectively. A connecting bolt 21 is provided at the bottom end of the second connecting flange 20, and a connecting nut 19 is provided at the top end of the first connecting flange 18. Multiple groups of through holes are respectively defined inside the first connecting flange 18 and the second connecting flange 20. Multiple groups of connecting bolts 21 and connecting nuts 19 are respectively provided at equal intervals in an annular manner at the bottom end of the second connecting flange 20 and the top end of the first connecting flange 18. The top ends of the connecting bolts 21 respectively penetrate the interiors of the second connecting flange 20 and the first connecting flange 18, and the connecting nuts 19 are rotatably connected to the outsides of the connecting bolts 21.

[0032] Specifically, if Figure 1 and Figure 3As shown, the connecting nut 19 can be unscrewed from the outside of the connecting bolt 21 at the top of the first connecting flange 18, and the connecting bolt 21 can be pulled out and disassembled from the second connecting flange 20 and the first connecting flange 18. Then, the connecting flue 6 can be removed from between the first flue 5 and the second flue 11. The split-structure flue gas duct can conveniently clean and maintain the inside of the flue gas conveying duct of the combined washing tower.

[0033] Example 3: A mounting slot 22 is provided inside the top of the connecting flue 6, and a mounting ring 23 is provided inside the mounting slot 22, and a filter screen 24 is fixed inside the mounting ring 23;

[0034] Specifically, if Figure 1 and Figure 4 As shown, a mounting ring 23 is installed inside the top of the connecting flue 6. Through the filter mesh 24 fixed inside the mounting ring 23, some particulate impurities contained in the conveyed flue gas can be assisted filtered and removed to reduce the impurity content in the flue gas.

[0035] An air delivery pipe 4 is fixed to the bottom end of the left side of the washing combination tower 2 , a first base 1 is fixed to the bottom end of the washing combination tower 2 , and a second base 15 is fixed to the bottom end of the absorption tower 14 .

[0036] Working principle: When the present invention is in use, a liquid separation pipe 7 is installed in the second flue 11, and ten groups of stainless steel spiral nozzles 17 are fixed at equal intervals on the top of the liquid separation pipe 7, which can spray the less-rich amine liquid pumped into the stainless steel spiral nozzle 17 upwards. A reverse spray pre-absorption section is added in the middle of the flue gas pipeline from the tail gas desulfurization and washing combination tower 2 to the absorption tower 14, which can increase the SO2 absorption efficiency. The downward radial flue gas and the upward sprayed less-rich amine liquid are in variable flow turbulent bubble contact here to form a liquid-in-gas absorption SO2 reaction. After the flue gas and the spray liquid are in variable flow turbulent bubble contact reaction, the gas-liquid mixture descends into the lower absorption chamber of the organic amine desulfurization tower for gas-liquid separation, thereby completing the pre-absorption operation, improving the desulfurization efficiency and reducing SO2 emissions in the tail gas. When the flue gas duct in the combined washing tower is used, a mounting ring 23 can be installed inside the top of the connecting flue 6. Through the filter screen 24 fixed inside the mounting ring 23, some particulate impurities contained in the transported flue gas can be assisted to be filtered and removed. When the first flue 5, the connecting flue 6 and the second flue 11 set in the combined washing tower are used to transport sulfur-containing flue gas, the connecting nut 19 can be unscrewed from the outside of the connecting bolt 21 at the top of the first connecting flange 18, and the connecting bolt 21 can be pulled out from the second connecting flange 20 and the first connecting flange 18. After disassembly, the connecting flue 6 can be removed from between the first flue 5 and the second flue 11, and the inside of the flue gas transport duct of the combined washing tower can be cleaned and maintained. The flue gas duct has a split structure.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A combined scrubbing tower with a tail gas desulfurization pre-absorption structure, comprising a combined scrubbing tower (2) and an absorption tower (14), characterized in that: An absorption tower (14) is provided on the right side of the washing combination tower (2), a first flue (5) is fixedly mounted on the top of the washing combination tower (2), a second flue (11) is fixedly mounted on the bottom of the left side of the absorption tower (14), a connecting flue (6) is provided between the first flue (5) and the second flue (11), a liquid separation pipe (7) is provided at the top of the second flue (11), and a stainless steel spiral nozzle (17) is fixed on the top of the liquid separation pipe (7), and both sides of the bottom of the liquid separation pipe (7) are provided. A bracket (8) is fixed to each of the washing combination tower (2) and the absorption tower (14), a pre-absorption pump (12) is provided between the washing combination tower (2) and the absorption tower (14), an input pipe (13) is fixed to the input end of the pre-absorption pump (12), and an output pipe (10) is fixed to the output end of the pre-absorption pump (12), a first steel frame (3) is fixed to the outside of the washing combination tower (2), a second steel frame (16) is fixed to the outside of the absorption tower (14), and an operating platform (9) is fixed between the first steel frame (3) and the second steel frame (16).

2. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 1, characterized in that: The washing combination tower (2) is connected to the interior of the first flue (5), the first flue (5) is connected to the interior of the second flue (11) via the connecting flue (6), and the second flue (11) is connected to the interior of the absorption tower (14).

3. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 1, characterized in that: The right side of the output pipe (10) passes through the interior of the left side of the second flue (11) and is fixedly connected to the left side of the liquid separation pipe (7).

4. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 1, characterized in that: Ten groups of the stainless steel spiral nozzles (17) are fixed at equal intervals in a ring at the top end of the liquid separation tube (7). One side of the bracket (8) is fixedly connected to one side inside the second flue (11). The bracket (8) is symmetrically arranged with respect to the vertical center line of the liquid separation tube (7).

5. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 1, characterized in that: A first connecting flange (18) is welded and fixed to the bottom ends of the first flue (5) and the connecting flue (6), and a second connecting flange (20) is welded and fixed to the top ends of the connecting flue (6) and the second flue (11), respectively. A connecting bolt (21) is provided at the bottom end of the second connecting flange (20), and a connecting nut (19) is provided at the top end of the first connecting flange (18). A plurality of through holes are respectively provided inside the first connecting flange (18) and the second connecting flange (20).

6. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 5, characterized in that: The connecting bolts (21) and the connecting nuts (19) are respectively arranged in a ring at equal intervals at the bottom end of the second connecting flange (20) and the top end of the first connecting flange (18), and the top ends of the connecting bolts (21) respectively penetrate the inside of the second connecting flange (20) and the first connecting flange (18), and the connecting nuts (19) are rotatably connected to the outside of the connecting bolts (21).

7. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 1, characterized in that: A mounting slot (22) is provided inside the top end of the connecting flue (6), and a mounting ring (23) is provided inside the mounting slot (22), and a filter screen (24) is fixed inside the mounting ring (23).

8. The combined scrubber with a tail gas desulfurization pre-absorption structure according to claim 1, characterized in that: A gas delivery pipe (4) is fixed to the bottom end of the left side of the washing combination tower (2), a first base (1) is fixed to the bottom end of the washing combination tower (2), and a second base (15) is fixed to the bottom end of the absorption tower (14).

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