CN216726614U - Desulfurization regeneration tail gas processing system - Google Patents
Desulfurization regeneration tail gas processing system Download PDFInfo
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- CN216726614U CN216726614U CN202123231691.0U CN202123231691U CN216726614U CN 216726614 U CN216726614 U CN 216726614U CN 202123231691 U CN202123231691 U CN 202123231691U CN 216726614 U CN216726614 U CN 216726614U
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Abstract
The utility model relates to a desulfurization regeneration tail gas treatment system, which comprises a regeneration tower, a gas-liquid separator and an incinerator; the regeneration tower is a regeneration tower in an ammonia wet oxidation desulfurization process system; the incinerator is an incinerator in a desulfurization waste liquid acid making process system; the utility model discloses send desulfurization regeneration tail gas to the burning furnace that burns of desulfurization waste liquid acidification technology as combustion-supporting gas to realize harmful impurity's desorption, the recycle of sulphur resource and regeneration tail gas's recycle among the regeneration tail gas.
Description
Technical Field
The utility model relates to a coke oven gas purifies technical field, especially relates to a desulfurization regeneration tail gas processing system.
Background
The wet oxidation desulfurization process by the ammonia method has simple flow and high desulfurization and decyanation efficiency, and the H in the coke oven gas after the tower is desulfurized by two stages to three stages2The S content can be reduced to 20mg/Nm3Therefore, the method is widely applied to the coking industry in China. In the above process, as shown in fig. 1, the rich desulfurization solution enters the bottom of the regeneration tower 1, and simultaneously a large amount of compressed air is introduced into the bottom of the regeneration tower 1, and the two flows upward after being mixed at the bottom of the tower, so that the rich desulfurization solution is oxidized and regenerated in the regeneration tower 1, and the generated elemental sulfur is floated out. The regenerated desulfurization barren solution flows out from the upper part of the regeneration tower 1 and naturally returns to the desulfurization tower for recycling by utilizing the potential difference; the sulfur foam floating on the top of the regeneration tower 1 automatically flows to a foam tank by using the potential difference; a large amount of air which does not participate in the reaction escapes from a gas phase outlet at the top of the regeneration tower 1 to become regeneration tail gas.
Because the regeneration tail gas contains a certain amount of harmful impurities such as hydrogen sulfide, ammonia and the like, the regeneration tail gas is not allowed to be directly discharged into the atmosphere and can be diffused only after the tail gas treatment reaches the emission standard. Meanwhile, the oxygen content in the regeneration tail gas is 15% -19%, and the utilization rate of oxygen in the treatment process is very low. How to remove harmful impurities in the regeneration tail gas and simultaneously improve the utilization rate of oxygen in the regeneration tail gas is a problem to be solved urgently by the existing ammonia wet oxidation desulfurization process.
Chinese patent application No. 201711243874.X discloses a coking desulfurization regeneration tower tail gas treatment system, Chinese patent application No. 201711351522.6 discloses a system for drying ammonium sulfate by utilizing desulfurization regeneration tail gas, Chinese patent application No. 201004912637. X discloses a coke oven gas desulfurization regeneration tower tail gas treatment process and system, and Chinese patent application No. 202110535881.7 discloses a purification treatment method for adsorbing regeneration tail gas by coke oven gas microcrystal, different technical schemes are provided for treating desulfurization regeneration tail gas respectively, but the technical schemes have the problems of long process flow, high investment, high operating cost, complex operation, no recovery and utilization of sulfur resources, low oxygen utilization rate and the like.
The process for preparing acid from the desulfurization waste liquid developed in recent years is a new technology for treating low-quality sulfur and secondary salt waste liquid generated in the coke oven gas ammonia wet oxidation desulfurization process. For example, the technical schemes of the method for preparing sulfuric acid from sulfur-containing waste liquid generated by a coal gas wet oxidation method disclosed in the Chinese patent application with the application number of 201610736196.X, the method for incinerating sulfuric acid from sulfur-containing waste liquid disclosed in the Chinese patent application with the application number of 201610777877.0, the process and the device for treating low-purity sulfur and byproduct waste liquid generated by coke oven gas desulfurization disclosed in the Chinese patent application with the application number of 201811607585.8, and the like are described in detail. The technical scheme includes that sulfur foam overflowing from the top of a regeneration tower is used as an initial raw material, sulfur slurry is prepared by a centrifugal separation and concentration method, then the sulfur slurry is sent to an incinerator, high-temperature incineration is carried out after atomization by compressed air, and elemental sulfur in the sulfur slurry and sulfur in secondary salt are converted into SO2. The main chemical reactions taking place inside the incinerator are as follows:
S+O2→SO2
NH4SCN+3O2→N2+CO2+SO2+2H2O
(NH4)2S2O3+5/2O2→N2+2SO2+4H2O
(NH4)2SO4+O2→N2+SO2+4H2O
4NH3+3O2→2N2+6H2O
the main product after burning the sulfur slurry is SO2、N2、CO2、H2The gaseous mixture of O is then subjected to different processes to produce sulfuric acid. And the combustion-supporting gas required by the high-temperature incineration of the incinerator is air or oxygen-enriched air.
Disclosure of Invention
The utility model provides a desulfurization regeneration tail gas processing system sends desulfurization regeneration tail gas to the burning furnace that burns of desulfurization waste liquid acidification technology as combustion-supporting gas to realize harmful substance's desorption, the recycle of sulphur resource and the recycle of regeneration tail gas among the regeneration tail gas.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a desulfurization regeneration tail gas treatment system comprises a regeneration tower, a gas-liquid separator and an incinerator; the regeneration tower is a regeneration tower in an ammonia wet oxidation desulfurization process system; the incinerator is used in a desulfurization waste liquid acid making process system; a gas phase outlet at the top of the regeneration tower is connected with a regeneration tail gas inlet of the gas-liquid separator through a regeneration tail gas pipeline; a regeneration tail gas outlet of the gas-liquid separator is connected with a combustion-supporting gas inlet of the incinerator through a regeneration tail gas pipeline II; and a desulfurization barren liquor outlet of the gas-liquid separator is connected with a desulfurization barren liquor inlet of a regeneration tower or a desulfurization tower in an ammonia wet oxidation desulfurization process system through a desulfurization barren liquor pipeline.
The desulfurization regeneration tail gas treatment system also comprises a tail gas heater; the tail gas heater is a tail gas heater in a desulfurization waste liquid acid making process system; the regeneration tail gas outlet of the gas-liquid separator is connected with the regeneration tail gas inlet of the tail gas heater through a regeneration tail gas pipeline II, and the regeneration tail gas outlet of the tail gas heater is connected with the combustion-supporting gas inlet of the incinerator through a regeneration tail gas pipeline III.
The gas-liquid separator is a gravity separator, a cyclone separator, a filtering separator, a baffle separator or an adsorption separator.
And a desulfurization barren solution outlet of the gas-liquid separator is higher than a desulfurization barren solution inlet of the regeneration tower, and a liquid seal device is arranged on a desulfurization barren solution pipeline.
The liquid seal device is a liquid seal groove or a U-shaped liquid seal pipe.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the ammonia wet oxidation desulfurization process system and the desulfurization waste liquid acid making process are integrated, the process flow of desulfurization regeneration tail gas treatment is short, the equipment investment is low (only one gas-liquid separator needs to be additionally arranged), the operation cost is low, and the operation is simple;
2) the sulfur resource in the desulfurization regeneration tail gas is recycled, and the yield of sulfuric acid is increased;
3) the desulfurization regeneration tail gas is used as combustion-supporting gas to be sent to the incinerator, so that the removal of harmful impurities in the regeneration tail gas and the recycling of sulfur resources are realized, the regeneration tail gas is not discharged outside, the environment-friendly effect is good, and the utilization rate of oxygen in the desulfurization regeneration tail gas is high.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization regeneration tail gas treatment system according to an embodiment of the present invention.
In the figure: 1. regeneration tower 2, gas-liquid separator 3, tail gas heater 4, incinerator 5, U-shaped liquid seal pipe
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the system for treating tail gas generated by desulfurization regeneration of the present invention comprises a regeneration tower 1, a gas-liquid separator 2 and an incinerator 4; the regeneration tower 1 is a regeneration tower in an ammonia wet oxidation desulfurization process system; the incinerator 4 is an incinerator in a desulfurization waste liquid acid making process system; a gas phase outlet at the top of the regeneration tower 1 is connected with a regeneration tail gas inlet of the gas-liquid separator 2 through a regeneration tail gas pipeline; a regeneration tail gas outlet of the gas-liquid separator 2 is connected with a combustion-supporting gas inlet of the incinerator 4 through a regeneration tail gas pipeline II; and a desulfurization barren liquor outlet of the gas-liquid separator is connected with a desulfurization barren liquor inlet of the desulfurizing tower in the regenerating tower 1 or the ammonia wet oxidation desulfurization process system through a desulfurization barren liquor pipeline.
The desulfurization regeneration tail gas treatment system also comprises a tail gas heater 3; the tail gas heater 3 is a tail gas heater in a desulfurization waste liquid acid making process system; the regeneration tail gas outlet of the gas-liquid separator 2 is connected with the regeneration tail gas inlet of the tail gas heater 3 through a regeneration tail gas pipeline II, and the regeneration tail gas outlet of the tail gas heater 3 is connected with the combustion-supporting gas inlet of the incinerator 4 through a regeneration tail gas pipeline III.
The gas-liquid separator 2 is a gravity separator, a cyclone separator, a filtering separator, a baffle separator or an adsorption separator.
And a desulfurization barren solution outlet of the gas-liquid separator 2 is higher than a desulfurization barren solution inlet of the regeneration tower 1, and a desulfurization barren solution pipeline is provided with a liquid seal device 5.
The liquid seal device 5 is a liquid seal groove or a U-shaped liquid seal pipe.
The working method of the desulfurization regeneration tail gas treatment system is as follows: the desulfurization regeneration tail gas discharged from the top of a regeneration tower 1 in the ammonia wet oxidation desulfurization process is firstly sent to a gas-liquid separator 2 to separate entrained desulfurization barren solution fog drops, and then sent to an incinerator 4 of a desulfurization waste liquid acid making process to be used as combustion-supporting gas; the separated desulfurization barren solution is returned to the regeneration tower 1 or sent to the desulfurization tower.
The gas separated by the gas-liquid separator 2 is firstly sent to a tail gas heater 3 of the process for preparing acid from the desulfurized waste liquid, and then sent to an incinerator 4 after indirect heat exchange with water vapor.
The desulfurized barren solution separated by the gas-liquid separator 2 firstly passes through the liquid seal device 5 and then automatically flows back to the regeneration tower 1 or the desulfurization tower.
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples.
[ examples ] A method for producing a compound
As shown in fig. 1, in this embodiment, the desulfurization regeneration tail gas treatment system includes a regeneration tower 1, a gas-liquid separator 2, a tail gas heater 3, an incinerator 4, and a U-shaped liquid seal pipe 5 in the ammonia wet oxidation desulfurization process system, and the tail gas heater and the incinerator 4 in the desulfurization waste liquid acid production process system. The working principle is as follows:
the regeneration tail gas from the top of the regeneration tower 1 is firstly sent to a gas-liquid separator 2 by the self pressure, and the desulfurization barren solution fog drops carried in the regeneration tail gas are separated. The separated desulfurized lean solution flows out from the bottom of the gas-liquid separator 2, passes through a U-shaped liquid seal pipe 5, and is returned to the regeneration tower 1 (or may be sent to the desulfurization tower as another embodiment).
And (3) sending the regenerated tail gas from the top of the gas-liquid separator 2 to a tail gas heater 3 of the process for preparing acid from the desulfurized waste liquid, and carrying out indirect heat exchange with water vapor. The regeneration tail gas is heated and then sent to the incinerator 4 to be used as combustion-supporting gas. In the incinerator 4, harmful impurities in the regeneration tail gas undergo pyrolysis and oxidation reactions, and the reaction formula is as follows:
4NH3+3O2→2N2+6H2O
2H2S+3O2→2SO2+2H2O
after the reaction, the ammonia in the regeneration tail gas is decomposed into harmless nitrogen and water; the hydrogen sulfide in the regeneration tail gas is oxidized into sulfur dioxide and water, wherein the sulfur dioxide can increase the yield of the sulfuric acid.
As the regeneration tail gas of the combustion-supporting gas, the oxygen in the regeneration tail gas is further utilized, and the utilization rate of the oxygen is improved.
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 (5)
1. A desulfurization regeneration tail gas treatment system is characterized by comprising a regeneration tower, a gas-liquid separator and an incinerator; the regeneration tower is a regeneration tower in an ammonia wet oxidation desulfurization process system; the incinerator is used in a desulfurization waste liquid acid making process system; a gas phase outlet at the top of the regeneration tower is connected with a regeneration tail gas inlet of the gas-liquid separator through a regeneration tail gas pipeline; a regeneration tail gas outlet of the gas-liquid separator is connected with a combustion-supporting gas inlet of the incinerator through a regeneration tail gas pipeline II; and a desulfurization barren liquor outlet of the gas-liquid separator is connected with a desulfurization barren liquor inlet of a regeneration tower or a desulfurization tower in an ammonia wet oxidation desulfurization process system through a desulfurization barren liquor pipeline.
2. The system of claim 1, further comprising a tail gas heater; the tail gas heater is a tail gas heater in a desulfurization waste liquid acid making process system; the regeneration tail gas outlet of the gas-liquid separator is connected with the regeneration tail gas inlet of the tail gas heater through a regeneration tail gas pipeline II, and the regeneration tail gas outlet of the tail gas heater is connected with the combustion-supporting gas inlet of the incinerator through a regeneration tail gas pipeline III.
3. The system of claim 1 or 2, wherein the gas-liquid separator is a gravity separator, a cyclone separator, a filter separator, a baffle separator or an adsorption separator.
4. The desulfurization regeneration tail gas treatment system according to claim 1 or 2, wherein the desulfurization lean solution outlet of the gas-liquid separator is higher than the desulfurization lean solution inlet of the regeneration tower, and a liquid seal device is arranged on the desulfurization lean solution pipeline.
5. The desulfurization regeneration tail gas treatment system of claim 4, wherein the liquid seal device is a liquid seal tank or a U-shaped liquid seal pipe.
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| CN202123231691.0U CN216726614U (en) | 2021-12-21 | 2021-12-21 | Desulfurization regeneration tail gas processing system |
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| CN202123231691.0U CN216726614U (en) | 2021-12-21 | 2021-12-21 | Desulfurization regeneration tail gas processing system |
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