CN211771109U - System for reducing desulfurization regeneration tail gas emission - Google Patents
System for reducing desulfurization regeneration tail gas emission Download PDFInfo
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- CN211771109U CN211771109U CN202020129543.4U CN202020129543U CN211771109U CN 211771109 U CN211771109 U CN 211771109U CN 202020129543 U CN202020129543 U CN 202020129543U CN 211771109 U CN211771109 U CN 211771109U
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Abstract
The utility model relates to a coke oven gas purifies technical field, especially relates to a reduce desulfurization regeneration tail gas discharge system. Comprises a first-stage regeneration tower, a second-stage regeneration tower, a third-stage regeneration tower, a first-stage supercharger, a second-stage supercharger and a third-stage supercharger; the one-level increases the machine and links to each other bottom the one-level regenerator tower through the pipeline, and the one-level regenerator tower top is passed through the pipeline and is increased the machine with the second grade and link to each other, and the second grade increases the machine and passes through the pipeline and link to each other bottom the second grade regenerator tower, and the second grade regenerator tower top is passed through the pipeline and is increased the machine with the third grade and link to each other, and the third grade increases the machine and. According to the invention, by recycling the regeneration tail gas, the utilization rate of oxygen in the regeneration tail gas is improved, the emission of the regeneration tail gas is reduced, and the requirements of energy conservation and emission reduction are met.
Description
Technical Field
The utility model relates to a coke oven gas purifies technical field, especially relates to a reduce desulfurization regeneration tail gas discharge system.
Background
Because the wet oxidation desulfurization process flow by the ammonia method is simple, the desulfurization and decyanation efficiency is high, the H in the coke oven gas after the tower is desulfurized through two stages to three stages2The S content can be reduced to 20mg/Nm3Therefore, the process is widely applied to the coking industry in China. In the process, the desulfurization rich solution enters the bottom of a regeneration tower, a large amount of compressed air is introduced to the bottom of the regeneration tower, and the desulfurization rich solution and the compressed air are mixed at the bottom of the regeneration tower and flow upwards, so that the desulfurization rich solution is oxidized and regenerated in the regeneration tower, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution returns to the desulfurization tower for recycling by utilizing the potential difference from the top, the sulfur foam floating on the top of the regeneration tower automatically flows to the foam tank by utilizing the potential difference, and a large amount of unreacted air escapes from a gas phase outlet at the top of the regeneration tower to become regeneration tail gas. Theories and practices prove that the oxygen content in the regeneration tail gas is 16-17%, the oxygen utilization rate is low, a certain amount of harmful impurities such as hydrogen sulfide, hydrogen cyanide, ammonia and the like are contained, the regeneration tail gas is not allowed to be directly discharged into the atmosphere, and the regeneration tail gas can be diffused only after the tail gas is treated to reach the discharge standard. How to improve the utilization rate of oxygen in the regeneration tail gas and reduce the emission of the regeneration tail gas is an urgent problem to be solved by the existing ammonia wet oxidation desulfurization process.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model provides a reduce desulfurization regeneration tail gas discharge system, the utility model discloses a regeneration tail gas's recycle improves the utilization ratio of oxygen in the regeneration tail gas, reduces regeneration tail gas discharge, realizes energy saving and emission reduction's requirement.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system for reducing the discharge amount of desulfurization regeneration tail gas comprises a primary regeneration tower, a secondary regeneration tower, a tertiary regeneration tower, a primary supercharger, a secondary supercharger and a tertiary supercharger; the one-level increases the machine and links to each other bottom the one-level regeneration tower through the pipeline, and the one-level regeneration tower top is passed through the pipeline and is increased the machine with the second grade and link to each other, and the second grade increases the machine and passes through the pipeline and link to each other bottom the second grade regeneration tower, and the second grade regeneration tower top is passed through the pipeline and is increased the machine with the third grade and link to each other, and the third grade increases the machine.
The device also comprises a first-stage desulfurizing tower, a second-stage desulfurizing tower, a third-stage desulfurizing tower, a first foam tank, a second foam tank and a third foam tank; the one-level desulfurizing tower passes through the pipeline and links to each other with the one-level regenerator, and the one-level regenerator top is passed through the pipeline and is linked to each other with first foam groove, and the second grade desulfurizing tower passes through the pipeline and links to each other with the second foam groove, and the second grade regenerator top passes through the pipeline and links to each other with the second foam groove, and the tertiary desulfurizing tower passes through the pipeline and links to each other with tertiary regenerator, and the tertiary regenerator top passes through the pipeline and links to each other with the third foam groove.
The bottoms of the first-stage regeneration tower, the second-stage regeneration tower and the third-stage regeneration tower are provided with gas-liquid mixers, and the gas-liquid mixers adopt Venturi mixers, static mixers or nozzles.
The first-stage supercharger, the second-stage supercharger and the third-stage supercharger adopt piston compressors, diaphragm compressors, screw compressors or centrifugal compressors.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model comprises a first-stage regeneration tower, a second-stage regeneration tower, a third-stage regeneration tower, a first-stage supercharger, a second-stage supercharger and a third-stage supercharger; the one-level increases the machine and links to each other bottom the pipeline and the one-level regenerator tower, and the one-level regenerator tower top is passed through the pipeline and is increased the machine with the second grade and link to each other, and the second grade increases the machine and says that the pipeline links to each other bottom the second grade regenerator tower, and the second grade regenerator tower top is passed through the pipeline and is increased the machine with the third grade and link to each other, and the third grade increases the machine and passes through. The first-stage regeneration tail gas escaping from the top of the first-stage regeneration tower enters a second-stage regeneration tower after being pressurized by a second-stage supercharger; the secondary regeneration tail gas escaping from the top of the secondary regeneration tower enters a tertiary regeneration tower after being pressurized by a tertiary supercharger; and (4) carrying out further treatment on the tertiary regeneration tail gas escaping from the top of the tertiary regeneration tower by using a tail gas treatment device, and then emptying after reaching the standard.
By recycling the regenerated tail gas, the utilization rate of oxygen in the regenerated tail gas is improved, and the emission of the regenerated tail gas is effectively reduced, so that the investment and the operating cost of a tail gas treatment device are reduced, and the requirements of energy conservation and emission reduction are met.
Drawings
Fig. 1 is a schematic structure and a schematic process diagram of the present invention.
In the figure: 1-first-stage regeneration tower 2-second-stage regeneration tower 3-third-stage regeneration tower 4-first-stage supercharger 5-second-stage supercharger 6-third-stage supercharger 7-first-stage desulfurizing tower 8-second-stage desulfurizing tower 9-third-stage desulfurizing tower 10-first foam groove 11-second foam groove 12-third foam groove
Detailed Description
The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings:
as shown in fig. 1, a system for reducing the emission of tail gas from desulfurization regeneration comprises a first-stage regenerator 1, a second-stage regenerator 2, a third-stage regenerator 3, a first-stage booster 4, a second-stage booster 5, a third-stage booster 6, a first-stage desulfurizing tower 7, a second-stage desulfurizing tower 8, a third-stage desulfurizing tower 9, a first foam tank 10, a second foam tank 11 and a third foam tank 12.
The one-level booster compressor 4 is connected with the bottom of the one-level regeneration tower 1 through a pipeline, the top of the one-level regeneration tower 1 is connected with the second-level booster compressor 5 through a pipeline, the second-level booster compressor 5 is connected with the bottom of the second-level regeneration tower 2 through a pipeline, the top of the second-level regeneration tower 2 is connected with the third-level booster compressor 6 through a pipeline, and the third-level booster compressor 6 is connected with the bottom of the third-level regeneration tower 3 through a pipeline.
One-level desulfurizing tower 7 passes through the pipeline and links to each other with one-level regenerator tower 1, and 1 top in one-level regenerator tower passes through the pipeline and links to each other with first foam groove 10, and second grade desulfurizing tower 8 passes through the pipeline and links to each other with second grade regenerator tower 2, and 2 tops in second grade regenerator tower pass through the pipeline and link to each other with second foam groove 11, and tertiary desulfurizing tower 9 passes through the pipeline and links to each other with tertiary regenerator tower 3, and 3 tops in tertiary regenerator tower pass through the pipeline and link to each other with third foam groove 12.
The bottoms of the first-stage regeneration tower 1, the second-stage regeneration tower 2 and the third-stage regeneration tower 3 are provided with gas-liquid mixers, and the gas-liquid mixers adopt Venturi mixers, static mixers or nozzles.
The first-stage supercharger 4, the second-stage supercharger 5 and the third-stage supercharger 6 are piston compressors, diaphragm compressors, screw compressors or centrifugal compressors.
The process flow of the utility model is as follows:
1) the first-stage desulfurization rich solution enters the bottom of a first-stage regeneration tower 1, compressed air introduced from the bottom of the same-stage regeneration tower 1 is mixed in a gas-liquid mixer at the bottom of the tower, the first-stage desulfurization rich solution is subjected to oxidation reaction in the first-stage regeneration tower 1, the regenerated desulfurization lean solution flows to a first-stage desulfurization tower 7 from the top of the tower by utilizing a potential difference, sulfur foam floating on the top of the tower automatically flows to a first foam tank 10 by utilizing the potential difference, and first-stage regeneration tail gas escapes from the top of the first-stage regeneration tower 1.
2) The first-stage regeneration tail gas escaped from the top of the first-stage regeneration tower 1 is pressurized by a second-stage supercharger 5, enters the bottom of the second-stage regeneration tower 2, and is mixed with the second-stage desulfurization rich liquid introduced from the bottom of the second-stage regeneration tower 2 in a gas-liquid mixer at the bottom of the second-stage regeneration tower, and the second-stage desulfurization rich liquid is subjected to oxidation reaction in the second-stage regeneration tower 2; the desulfurization barren solution flows to a secondary desulfurization tower 8 from the tower top by utilizing the potential difference, the sulfur foam floating on the tower top automatically flows to a second foam tank 11 by utilizing the potential difference, and secondary regeneration tail gas escapes from the top of a secondary regeneration tower 2.
3) The secondary regeneration tail gas escaped from the top of the secondary regeneration tower 2 enters the bottom of the tertiary regeneration tower 3 after being pressurized by the tertiary supercharger 6, and after being mixed with the tertiary desulfurization rich liquid introduced from the bottom of the tertiary regeneration tower 3 in a gas-liquid mixer at the bottom of the tower, the tertiary desulfurization rich liquid is subjected to oxidation reaction in the tertiary regeneration tower 3; the desulfurization barren solution flows to a third-stage desulfurization tower 9 from the tower top by utilizing a potential difference, sulfur foam floating on the tower top automatically flows to a third foam tank 12 by utilizing the potential difference, and the third-stage regeneration tail gas escaped from the top of the third-stage regeneration tower 3 is sent to a tail gas treatment device for further treatment and then is discharged after reaching the standard.
Example 1
The coke oven gas treatment capacity of the desulfurization unit of the gas purification device is 167000Nm3H, H in coke oven gas before desulfurization2The S content is 6g/Nm3Two-stage desulfurization is adopted, and H in coke oven gas after one-stage desulfurization2The S content is 0.2g/Nm3H in the coke oven gas after two-stage desulfurization2The S content was 0.02g/Nm3For example.
The first-stage desulfurization rich solution enters the bottom of a first-stage regeneration tower 1, and 0.6MPa of flow rate of 4700Nm is introduced into the bottom of the regeneration tower3The compressed air of/h is mixed vigorously in a gas-liquid mixer at the bottom of the tower in advance and flows upwards, so that the first-stage desulfurization rich solution is oxidized and regenerated in the first-stage regeneration tower, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution flows to a first-stage desulfurization tower 7 from the top by using potential difference for recycling; sulfur foam floating on the top of the primary regeneration tower automatically flows to the first foam tank 10 by utilizing the potential difference; the tail gas escaping from the top gas phase outlet of the primary regeneration tower 1 becomes primary regeneration tail gas. The first-stage regeneration tail gas amount is about 4476.5Nm3Dry gas, wherein the oxygen content is about 17.06% (dry gas).
The first-stage regeneration tail gas is pressurized by a second-stage supercharger 5 at 0.6MPa, then is sent to the bottom of a second-stage regeneration tower 2, and is also sent to a second-stage desulfurization rich liquid at the bottom of the second-stage regeneration tower 2, and after being mixed vigorously in a gas-liquid mixer at the bottom of the tower, the mixture flows upwards in a parallel flow manner, so that the second-stage desulfurization rich liquid is oxidized and regenerated in the second-stage regeneration tower 2, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution flows to a secondary desulfurization tower 8 from the top by using potential difference for recycling; the sulfur foam floating on the top of the secondary regeneration tower automatically flows to a second foam tank 11 by utilizing the potential difference; the tail gas escaping from the gas phase outlet at the top of the secondary regeneration tower 2 becomes secondary regeneration tail gas. The secondary regeneration tail gas amount is about 4469.5Nm3Dry gas, wherein the oxygen content is about 16.92% (dry gas). And the secondary regeneration tail gas is delivered to a tail gas treatment device for further treatment and then is exhausted after reaching the standard.
If the original desulfurization regeneration process is adopted, the total discharge amount of the regenerated tail gas is about 9170Nm3H (dry gas). Therefore, the utility model discloses the regeneration tail gas of technology compares with former technology, and the emission reduces about 51.3%, reduces the investment and the running cost that have reduceed tail gas processing apparatus greatly.
Example 2
The coke oven gas treatment capacity of the desulfurization unit of the gas purification device is 167000Nm3H, H in coke oven gas before desulfurization2S contentIs 10g/Nm3Adopting three-stage desulfurization, and H in the coke oven gas after the first-stage desulfurization2The S content is 1.0g/Nm3H in the coke oven gas after the second-stage desulfurization2The S content was 0.1g/Nm3H in the coke oven gas after three-stage desulfurization2The S content was 0.02g/Nm3For example.
The first-stage desulfurization rich solution enters the bottom of a first-stage regeneration tower 1, and 0.6MPa of flow of 6000Nm is introduced into the bottom of the first-stage regeneration tower3The compressed air of/h is mixed vigorously in a gas-liquid mixer at the bottom of the tower in advance and flows upwards, so that the first-stage desulfurization rich solution is oxidized and regenerated in the first-stage regeneration tower 1, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution flows to a first-stage desulfurization tower 7 from the top by using potential difference for recycling; sulfur foam floating on the top of the primary regeneration tower 1 automatically flows to a first foam tank 10 by utilizing a potential difference; the tail gas escaping from the top gas phase outlet of the primary regeneration tower 1 becomes primary regeneration tail gas. The first-stage regeneration tail gas amount is about 5653.2Nm3Dry gas, wherein the oxygen content is about 16.15% (dry gas).
The first-stage regeneration tail gas is pressurized by a second-stage supercharger to 0.6MPa, then is sent to the bottom of a second-stage regeneration tower 2, and is also sent to a second-stage desulfurization rich liquid at the bottom of the second-stage regeneration tower 2, and after being mixed vigorously in a gas-liquid mixer at the bottom of the tower, the second-stage desulfurization rich liquid flows upwards in a parallel flow manner, so that the second-stage desulfurization rich liquid is oxidized and regenerated in the second-stage regeneration tower 2, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution flows to a secondary desulfurization tower 8 from the top by using potential difference for recycling; the sulfur foam floating on the top of the secondary regeneration tower 2 automatically flows to a second foam tank 11 by utilizing the potential difference; the tail gas escaping from the gas phase outlet at the top of the secondary regeneration tower 2 becomes secondary regeneration tail gas. The secondary regeneration tail gas amount is about 5619.2Nm3Dry gas, wherein the oxygen content is about 15.65% (dry gas).
And the secondary regeneration tail gas is pressurized by 0.6MPa through a three-stage supercharger 6, then is sent to the bottom of the three-stage regeneration tower 3, and is also sent to the three-stage desulfurization rich liquid at the bottom of the three-stage regeneration tower 3, and after being mixed vigorously in a gas-liquid mixer at the bottom of the tower, the two-stage desulfurization rich liquid flows upwards in a parallel flow manner, so that the three-stage desulfurization rich liquid is oxidized and regenerated in the three-stage regeneration tower 3, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution is utilized from the topThe potential difference flows to a three-stage desulfurizing tower 9 for recycling; the sulfur foam floating on the top of the third-stage regeneration tower 3 automatically flows to a third foam tank 12 by using a potential difference; the tail gas escaping from the gas phase outlet at the top of the third-stage regeneration tower 3 becomes the third-stage regeneration tail gas. The three-stage regeneration tail gas amount is about 5616.2Nm3Dry gas, wherein the oxygen content is about 15.60% (dry gas). And the tertiary regeneration tail gas treatment device is used for further treatment and then is emptied after reaching the standard.
If the original desulfurization regeneration process is adopted, the total emission of the regeneration tail gas is about 16667.8Nm3H (dry gas). Therefore, compared with the prior art, the regeneration tail gas of the process of the utility model reduces the emission by about 66.3 percent, and greatly reduces the investment and the running cost of the tail gas treatment device.
The utility model discloses a regeneration tail gas's recycle improves the utilization ratio of oxygen in the regeneration tail gas, effectively reduces regeneration tail gas's emission to reduce tail gas processing apparatus's investment and working costs, realize energy saving and emission reduction's requirement.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. A system for reducing the discharge amount of desulfurization regeneration tail gas is characterized by comprising a primary regeneration tower, a secondary regeneration tower, a tertiary regeneration tower, a primary supercharger, a secondary supercharger and a tertiary supercharger; the one-level booster compressor passes through the pipeline and links to each other bottom the one-level regenerator column, and the one-level regenerator column top is passed through the pipeline and is increased the machine with the second grade and link to each other, and the second grade increases the machine and passes through the pipeline and link to each other bottom the second grade regenerator column, and the second grade regenerator column top is passed through the pipeline and is increased the machine with the third grade and link to each other, and the third grade increases the machine and.
2. The system for reducing the emission of the tail gas generated by desulfurization regeneration according to claim 1, further comprising a primary desulfurization tower, a secondary desulfurization tower, a tertiary desulfurization tower, a first foam tank, a second foam tank and a third foam tank; the one-level desulfurizing tower passes through the pipeline and links to each other with the one-level regenerator, and the one-level regenerator top is passed through the pipeline and is linked to each other with first foam groove, and the second grade desulfurizing tower passes through the pipeline and links to each other with the second foam groove, and the second grade regenerator top passes through the pipeline and links to each other with the second foam groove, and the tertiary desulfurizing tower passes through the pipeline and links to each other with tertiary regenerator, and the tertiary regenerator top passes through the pipeline and links to each other with the third foam groove.
3. The system for reducing the emission of the desulfurization regeneration tail gas according to claim 1, wherein a gas-liquid mixer is arranged at the bottom of the first-stage regeneration tower, the second-stage regeneration tower and the third-stage regeneration tower, and the gas-liquid mixer adopts a Venturi mixer, a static mixer or a nozzle.
4. The system for reducing the emission of the desulfurization regeneration tail gas according to claim 1, wherein the first-stage supercharger, the second-stage supercharger and the third-stage supercharger employ a piston compressor, a diaphragm compressor, a screw compressor or a centrifugal compressor.
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| CN115305121A (en) * | 2021-05-08 | 2022-11-08 | 宝武碳业科技股份有限公司 | Process method for improving oxygen utilization rate in HPF (high pressure fluidized bed) desulfurization regeneration air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115305121A (en) * | 2021-05-08 | 2022-11-08 | 宝武碳业科技股份有限公司 | Process method for improving oxygen utilization rate in HPF (high pressure fluidized bed) desulfurization regeneration air |
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