Washing system of recycle hydrogen desulfurization tower

Abstract

The utility model relates to the technical field of desulfurizing towers, and discloses a washing system of a circulating hydrogen desulfurizing tower. The washing system comprises a desulfurizing tower device, a barren liquor pipeline, a circulating hydrogen gas pipeline and a washing pipeline, a barren liquor inlet is formed in the upper part of the desulfurizing tower device and is connected with the barren liquor pipeline, and a rich liquor outlet is formed in the bottom of the desulfurizing tower device; the desulfurizing tower device is provided with a gas inlet and a gas outlet, the gas outlet is positioned at the top of the desulfurizing tower device, and the gas inlet and the gas outlet are respectively connected with a circulating hydrogen gas pipeline; the washing pipeline comprises a desalted water branch and a deoxygenated water branch which are connected in parallel, branch valves are mounted on the desalted water branch and the deoxygenated water branch, and the washing pipeline is connected with the barren liquor pipeline; the circulating hydrogen gas pipeline is provided with a first branch port at the upstream side of the gas inlet, the circulating hydrogen gas pipeline is provided with a second branch port at the downstream side of the gas outlet, an overline pipeline is connected between the first branch port and the second branch port, and an overline regulating valve is mounted on the overline pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization towers, in particular to a water washing system for a recycle hydrogen desulfurization tower. Background Art

[0002] At present, for a recycle hydrogen desulfurization tower, lean liquid is boosted in pressure and input into the upper tray, rinsed from top to bottom and then discharged from the bottom of the desulfurization tower. Recycle hydrogen enters the desulfurization tower from the bottom, flows upward to the top of the tower and enters the inlet liquid separator of the recycle hydrogen compressor.

[0003] As disclosed in the Chinese utility model patent with the authorization announcement number CN216654064U and the authorization announcement date of June 3, 2022, an anti-blocking desulfurization treatment system specifically includes a desulfurization tower. A gas outlet is arranged at the top of the desulfurization tower, a liquid inlet is arranged below the gas outlet, a gas inlet is arranged below the liquid inlet, a liquid outlet is arranged below the gas inlet, and the liquid outlet is communicated with a sedimentation and separation device; a plurality of stepped sieve plates are arranged in the desulfurization tower, and a convex-shaped desulfurization cavity is formed between the adjacent stepped sieve plates and the desulfurization tower. The stepped sieve plates are located between the liquid inlet and the gas inlet. Desulfurization liquid is sprayed from the upper sieve plate into the lower sieve plate, and the hydrogen sulfide-containing gas rises from the bottommost stepped sieve plate, and after passing through each layer of stepped sieve plate in turn, it is fully neutralized and adsorbed with the desulfurization liquid for desulfurization.

[0004] However, during the operation of the desulfurization tower, scale substances such as ammonium salts and sludge will be generated on the trays, and the trays are prone to blockage, requiring frequent shutdowns for maintenance. In addition, liquid carry-over in the desulfurization tower will bring accumulated liquid into the inlet liquid separator of the recycle hydrogen compressor, which may cause the compressor to trip and shut down. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is that during the operation of the desulfurization tower, scale substances such as ammonium salts and sludge will be generated on the trays, and the trays are prone to blockage, requiring frequent shutdowns for maintenance; moreover, liquid carry-over in the desulfurization tower will bring accumulated liquid into the inlet liquid separator of the recycle hydrogen compressor, which may cause the compressor to trip and shut down.

[0006] To solve the above technical problems, the utility model provides a water washing system for a recycle hydrogen desulfurization tower:

[0007] The water washing system of the recycle hydrogen desulfurization tower includes a desulfurization tower device, a lean liquid pipeline, a recycle hydrogen gas pipeline and a water washing pipeline. A lean liquid inlet is arranged at the upper part of the desulfurization tower device, the lean liquid inlet is connected with the lean liquid pipeline, and a rich liquid outlet is arranged at the bottom of the desulfurization tower device;

[0008] The desulfurization tower device is provided with a gas inlet and a gas outlet. The gas inlet is located below the lean liquid inlet, the gas outlet is located at the top of the desulfurization tower device, and the gas inlet and the gas outlet are respectively connected with the recycle hydrogen gas pipeline;

[0009] The water washing pipeline includes a demineralized water branch and a deaerated water branch arranged in parallel. Branch valves are installed on both the demineralized water branch and the deaerated water branch. The water washing pipeline is connected to the lean liquid pipeline;

[0010] A first sub-interface is provided on the upstream side of the gas inlet of the circulating hydrogen gas pipeline. A second sub-interface is provided on the downstream side of the gas outlet of the circulating hydrogen gas pipeline. A cross pipeline is connected between the first sub-interface and the second sub-interface. A cross pipeline regulating valve is installed on the cross pipeline.

[0011] Further, a first converging interface is provided on the lean liquid pipeline. The water washing pipeline further includes a first main water washing path. One end of the first main water washing path is respectively connected to the demineralized water branch and the deaerated water branch. The other end of the first main water washing path is connected to the first converging interface.

[0012] Further, a first inlet valve and a first booster pump are sequentially installed on the lean liquid pipeline along the liquid inlet direction. The first converging interface is arranged between the first inlet valve and the first booster pump.

[0013] Further, the water washing pipeline further includes a second main water washing path. The second main water washing path is arranged in parallel with the first main water washing path and is connected to the lean liquid pipeline.

[0014] Further, an auxiliary pipeline is also connected to the lean liquid pipeline. A second booster pump and a second inlet valve are sequentially installed on the auxiliary pipeline along the liquid inlet direction. A second converging interface is further provided between the second booster pump and the second inlet valve on the auxiliary pipeline. The second main water washing path is connected to the second converging interface.

[0015] Further, a pressure gauge is also installed on the deaerated water branch. The pressure gauge is located on the downstream side of the branch valve.

[0016] Further, both the first main water washing path and the second main water washing path adopt DN80 pipes. Main path valves are respectively installed on the first main water washing path and the second main water washing path.

[0017] Further, flow sensors are respectively installed at the lean liquid inlet and the rich liquid outlet. The flow sensors are used to detect the flow difference between the incoming lean liquid and the outgoing rich liquid.

[0018] Further, pressure sensors are respectively installed at the gas inlet and the gas outlet. The pressure sensors are used to detect the pressure difference between the incoming circulating hydrogen gas and the outgoing circulating hydrogen gas.

[0019] Further, the desulfurization tower device is also provided with an oil skimming line and an oil skimming pipeline, and the connection port of the oil skimming pipeline is arranged at the same height as the oil skimming line.

[0020] Compared with the prior art, the water washing system of a recycle hydrogen desulfurization tower of the present utility model has the beneficial effects that: the water washing system of the recycle hydrogen desulfurization tower adopts the design form of a desulfurization tower device, a lean liquid pipeline, a recycle hydrogen gas pipeline, a water washing pipeline and a crossover pipeline. The upper part of the desulfurization tower device is provided with a lean liquid inlet, and the lean liquid inlet is connected with the lean liquid pipeline. The lean liquid is transported to the upper lean liquid inlet through the lean liquid pipeline, and the lean liquid washes the internal trays of the desulfurization tower device from top to bottom and adsorbs sulfur to form rich liquid, and finally the rich liquid is discharged from the rich liquid outlet at the bottom of the desulfurization tower device. The desulfurization tower device is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are respectively connected with the recycle hydrogen gas pipeline. The recycle hydrogen gas enters the desulfurization tower device from the gas inlet and is discharged upward from the top gas outlet after being washed by the lean liquid.

[0021] Among them, the water washing pipeline includes a desalted water branch and a deoxygenated water branch arranged in parallel, and the water washing pipeline is connected with the lean liquid pipeline. During the operation of the desulfurization tower, the branch valves on the desalted water branch and the deoxygenated water branch can be controlled to be opened to perform on-line water washing on the desulfurization tower device. The desalted water and the deoxygenated water can carry away scale substances such as ammonium salts and sludge inside the trays, effectively extending the operation cycle of the recycle hydrogen desulfurization tower and avoiding the problems of easy blockage of the trays and frequent shutdown for maintenance. In addition, a crossover pipeline is connected between the first sub-interface and the second sub-interface of the recycle hydrogen gas pipeline. The intake air volume of the desulfurization tower can be dynamically adjusted through the crossover regulating valve, thereby reducing the liquid entrainment frequency of the recycle hydrogen desulfurization tower and preventing the interlock shutdown of the liquid separation tank at the inlet of the recycle hydrogen compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the water washing system of the recycle hydrogen desulfurization tower in an embodiment of the present utility model;

[0023] In the figure: 1-desulfurization tower device, 11-lean liquid inlet, 12-rich liquid outlet, 13-gas inlet, 14-gas outlet, 15-oil skimming pipeline, 2-lean liquid pipeline, 21-first converging interface, 22-first inlet valve, 23-first booster pump, 3-recycle hydrogen gas pipeline, 31-first sub-interface, 32-second sub-interface, 4-water washing pipeline, 40-branch valve, 41-desalted water branch, 42-deoxygenated water branch, 43-first water washing main path, 44-second water washing main path, 45-pressure gauge, 46-main path valve, 5-crossover pipeline, 50-crossover regulating valve, 6-auxiliary pipeline, 61-second booster pump, 62-second inlet valve, 63-second converging interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present utility model are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0027] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] As Figure 1 shown, a water washing system of a recycle hydrogen desulfurization tower according to an embodiment of the present utility model includes a desulfurization tower device 1, a lean liquid pipeline 2, a recycle hydrogen gas pipeline 3, and a water washing pipeline 4. A lean liquid inlet 11 is provided at the upper part of the desulfurization tower device 1, and the lean liquid inlet 11 is connected to the lean liquid pipeline 2. A rich liquid outlet 12 is provided at the bottom of the desulfurization tower device 1. The desulfurization tower device 1 is provided with a gas inlet 13 and a gas outlet 14. The gas inlet 13 is located below the lean liquid inlet 11, and the gas outlet 14 is located at the top of the desulfurization tower device 1. The gas inlet 13 and the gas outlet 14 are respectively connected to the recycle hydrogen gas pipeline 3.

[0029] The water washing pipeline 4 includes a demineralized water branch 41 and a deaerated water branch 42 arranged in parallel. Branch valves 40 are installed on both the demineralized water branch 41 and the deaerated water branch 42. The water washing pipeline 4 is connected to the lean liquid pipeline 2; A first sub-interface 31 is provided on the upstream side of the circulating hydrogen gas pipeline 3 relative to the gas inlet 13, and a second sub-interface 32 is provided on the downstream side of the circulating hydrogen gas pipeline 3 relative to the gas outlet 14. A crossover pipeline 5 is connected between the first sub-interface 31 and the second sub-interface 32, and a crossover regulating valve 50 is installed on the crossover pipeline 5.

[0030] The water washing system of this circulating hydrogen desulfurization tower adopts the design form of the desulfurization tower device 1, the lean liquid pipeline 2, the circulating hydrogen gas pipeline 3, the water washing pipeline 4 and the crossover pipeline 5. A lean liquid inlet 11 is provided at the upper part of the desulfurization tower device 1, and the lean liquid inlet 11 is connected to the lean liquid pipeline 2. The lean liquid is transported through the lean liquid pipeline 2 to the upper lean liquid inlet 11, and the lean liquid rinses the internal trays of the desulfurization tower device 1 from top to bottom and adsorbs sulfur to form rich liquid. Finally, the rich liquid is discharged from the rich liquid outlet 12 at the bottom of the desulfurization tower device 1. The desulfurization tower device 1 is provided with a gas inlet 13 and a gas outlet 14, and the gas inlet 13 and the gas outlet 14 are respectively connected to the circulating hydrogen gas pipeline 3. The circulating hydrogen gas enters the desulfurization tower device 1 from the gas inlet 13, and after being rinsed by the lean liquid, it discharges upward from the top gas outlet 14.

[0031] Among them, the water washing pipeline 4 includes a demineralized water branch 41 and a deaerated water branch 42 arranged in parallel. The water washing pipeline 4 is connected to the lean liquid pipeline 2. During the operation of the desulfurization tower, the branch valves 40 on the demineralized water branch 41 and the deaerated water branch 42 can be controlled to open for on-line water washing of the desulfurization tower device 1. The demineralized water and the deaerated water can carry away scale substances such as ammonium salts and sludge inside the trays, effectively extending the operation cycle of the circulating hydrogen desulfurization tower and avoiding the problems of easy blockage of the trays and frequent shutdown for maintenance. In addition, a crossover pipeline 5 is connected between the first sub-interface 31 and the second sub-interface 32 of the circulating hydrogen gas pipeline 3. The intake air volume of the desulfurization tower can be dynamically adjusted through the crossover regulating valve 50, thereby reducing the frequency of liquid carry-over in the circulating hydrogen desulfurization tower and preventing the interlock shutdown of the liquid separation tank at the inlet of the circulating hydrogen compressor.

[0032] In this embodiment, a first convergence interface 21 is provided on the lean liquid pipeline 2. The water washing pipeline 4 further includes a first main water washing path 43. One end of the first main water washing path 43 is respectively connected to the demineralized water branch 41 and the deaerated water branch 42, and the other end of the first main water washing path 43 is connected to the first convergence interface 21. Specifically, a first inlet valve 22 and a first booster pump 23 are installed on the lean liquid pipeline 2 in the liquid inlet direction in sequence, and the first convergence interface 21 is arranged between the first inlet valve 22 and the first booster pump 23. The demineralized water and the deaerated water enter the first convergence interface 21 through the first main water washing path 43 and are transported to the desulfurization tower device 1 under the pressure of the first booster pump 23, thereby achieving the purpose of on-line water washing.

[0033] Moreover, the water washing pipeline 4 further includes a second main water washing path 44. The second main water washing path 44 is arranged in parallel with the first main water washing path 43 and is connected to the lean liquid pipeline 2. Correspondingly, an auxiliary pipeline 6 is also connected to the lean liquid pipeline 2. Along the liquid inlet direction, a second booster pump 61 and a second inlet valve 62 are sequentially installed on the auxiliary pipeline 6. A second converging interface 63 is further provided between the second booster pump 61 and the second inlet valve 62 on the auxiliary pipeline 6, and the second main water washing path 44 is connected to the second converging interface 63. Another water washing path is formed by the second main water washing path 44 and the auxiliary pipeline 6, so that the demineralized water and deaerated water can not only be jointly input into the desulfurization tower device 1 along with the lean liquid, but also be specially used to convey the demineralized water and deaerated water into the desulfurization tower device 1 for water washing work when the conveyance of the lean liquid is stopped.

[0034] As a further preferred solution, a pressure gauge 45 is also installed on the deaerated water branch 42. The pressure gauge 45 is located on the downstream side of the branch valve 40 and can accurately detect the conveying pressure of the deaerated water to ensure an appropriate water washing flow rate. Specifically, both the first main water washing path 43 and the second main water washing path 44 adopt DN80 pipes, and main path valves 46 are respectively installed on the first main water washing path 43 and the second main water washing path 44. The water washing conveyance path can be flexibly switched through the main path valves 46 to meet the water washing requirements under different conditions.

[0035] In this embodiment, flow sensors (not shown in the figure) are respectively installed at the lean liquid inlet 11 and the rich liquid outlet 12. The flow sensors are used to detect the flow rate difference between the incoming lean liquid and the outgoing rich liquid. Moreover, pressure sensors are respectively installed at the gas inlet 13 and the gas outlet 14. The pressure sensors are used to detect the pressure difference between the incoming recycle hydrogen gas and the outgoing recycle hydrogen gas. According to the detected flow rate difference between the incoming lean liquid and the outgoing rich liquid and the pressure difference between the incoming recycle hydrogen gas and the outgoing recycle hydrogen gas, the clogging degree of the trays inside the desulfurization tower device 1 is judged, so as to accurately control the water washing pipeline to start the water washing work.

[0036] In addition, the desulfurization tower device 1 is further provided with a skimming line and a skimming pipeline 15. The connection port of the skimming pipeline 15 is arranged at the same height as the skimming line. With the design of the skimming line and the skimming pipeline 15, the on-line skimming treatment of the recycle hydrogen desulfurization tower can be realized. When serious liquid entrainment occurs in the recycle hydrogen desulfurization tower, the operation of the water washing system is as follows: on the basis of the lean liquid pipeline 2, the demineralized water and deaerated water processes are added. The desulfurization tower device 1 can be subjected to on-line water washing one to two times a week, with the water inlet flow rate of 30 t / h each time, the total demineralized water + lean liquid inlet tower flow rate of 60 t / h, and the interval between each tower washing of 3 h. The actual operation can meet the normal production requirements of the recycle hydrogen desulfurization tower.

[0037] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A water washing system for a recycle hydrogen desulfurization tower, characterized in that, It includes a desulfurization tower device, a lean liquid pipeline, a recycle hydrogen gas pipeline, and a water washing pipeline. A lean liquid inlet is provided at the upper part of the desulfurization tower device. The lean liquid inlet is connected to the lean liquid pipeline. A rich liquid outlet is provided at the bottom of the desulfurization tower device. The desulfurization tower device is provided with a gas inlet and a gas outlet. The gas inlet is located on the lower side of the lean liquid inlet. The gas outlet is located at the top of the desulfurization tower device. The gas inlet and the gas outlet are respectively connected to the recycle hydrogen gas pipeline. The water washing pipeline includes a desalted water branch and a deaerated water branch arranged in parallel. Branch valves are installed on both the desalted water branch and the deaerated water branch. The water washing pipeline is connected to the lean liquid pipeline. A first branch interface is provided on the upstream side of the gas inlet of the recycle hydrogen gas pipeline. A second branch interface is provided on the downstream side of the gas outlet of the recycle hydrogen gas pipeline. A cross-line pipeline is connected between the first branch interface and the second branch interface. A cross-line regulating valve is installed on the cross-line pipeline.

2. The water washing system of the recycle hydrogen desulfurization tower according to claim 1, wherein, A first converging interface is provided on the lean liquid pipeline. The water washing pipeline further includes a first main water washing path. One end of the first main water washing path is respectively connected to the desalted water branch and the deaerated water branch. The other end of the first main water washing path is connected to the first converging interface.

3. The water washing system of the recycle hydrogen desulfurization tower according to claim 2, characterized in that, A first inlet valve and a first booster pump are sequentially installed on the lean liquid pipeline along the liquid inlet direction. The first converging interface is arranged between the first inlet valve and the first booster pump.

4. The water washing system of the recycle hydrogen desulfurization tower according to claim 3, characterized in that, The water washing pipeline further includes a second main water washing path. The second main water washing path is arranged in parallel with the first main water washing path and is connected to the lean liquid pipeline.

5. The water washing system of the recycle hydrogen desulfurization tower according to claim 4, characterized in that, An auxiliary pipeline is further connected to the lean liquid pipeline. A second booster pump and a second inlet valve are sequentially installed on the auxiliary pipeline along the liquid inlet direction. A second converging interface is further provided between the second booster pump and the second inlet valve on the auxiliary pipeline. The second main water washing path is connected to the second converging interface.

6. The water washing system of the recycle hydrogen desulfurization tower according to claim 1, characterized in that, A pressure gauge is further installed on the deaerated water branch. The pressure gauge is located on the downstream side of the branch valve.

7. The water washing system of the recycle hydrogen desulfurization tower according to claim 4, wherein Both the first main water washing path and the second main water washing path adopt DN80 pipes. Main path valves are respectively installed on the first main water washing path and the second main water washing path.

8. The water washing system of the recycle hydrogen desulfurization tower according to claim 1, wherein, Flow sensors are respectively installed at the lean liquid inlet and the rich liquid outlet. The flow sensors are used to detect the flow difference between the lean liquid entering and the rich liquid discharging.

9. The water washing system of the recycle hydrogen desulfurization tower according to claim 8, characterized in that, Pressure sensors are respectively installed at the gas inlet and the gas outlet. The pressure sensors are used to detect the pressure difference between the recycle hydrogen gas entering and the recycle hydrogen gas discharging.

10. The water washing system of the recycle hydrogen desulfurization tower according to claim 1, characterized in that, The desulfurization tower device is further provided with a skimming line and a skimming pipeline. The connection port of the skimming pipeline is arranged at the same height as the skimming line.

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