CN115367930A - Desulfurization wastewater treatment system and method - Google Patents
Desulfurization wastewater treatment system and method Download PDFInfo
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- CN115367930A CN115367930A CN202211001269.2A CN202211001269A CN115367930A CN 115367930 A CN115367930 A CN 115367930A CN 202211001269 A CN202211001269 A CN 202211001269A CN 115367930 A CN115367930 A CN 115367930A
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Abstract
The invention relates to the technical field of desulfurization wastewater treatment, and discloses a desulfurization wastewater treatment system and a desulfurization wastewater treatment method. The system comprises: the pretreatment device is used for pretreating the desulfurization wastewater to remove divalent ions in the desulfurization wastewater; the electrolysis device is used for electrolyzing the pretreated desulfurization wastewater; the gas-liquid separation device is used for carrying out gas-liquid separation on the gas-liquid mixture generated in the electrolysis device; a dechlorination device for dechlorinating the hydrogen separated from the gas-liquid separation device; the hydrogen pressurizing device is used for pressurizing, cooling and drying the dechlorinated hydrogen; and the hydrogen deoxidation device is used for deoxidizing the hydrogen after pressurization, cooling and drying. According to the technical scheme of the invention, the desulfurization wastewater is treated to prepare the sodium hypochlorite solution and hydrogen, and the whole process does not generate discharged wastes.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater treatment, in particular to a desulfurization wastewater treatment system and a desulfurization wastewater treatment method.
Background
At present, the wet desulphurization wastewater is generally treated by a dosing flocculation precipitation process, most of divalent ions are removed by flocculation precipitation, and then the wastewater is discharged into a receiving water body after the pH value is adjusted by adding acid/alkali. Along with the gradual improvement of the national requirements for environmental protection, more and more production enterprises require zero discharge of pollutants, the desulfurization wastewater contains a large amount of chloride ions and sodium ions after being treated conventionally, in order to meet the zero discharge requirement, an evaporation process is generally adopted, and the desulfurization wastewater evaporation process means that after being pretreated, the desulfurization wastewater is evaporated to dryness by heating to realize the zero discharge of the desulfurization wastewater, and the routine process route of the technology is as follows: pretreatment, membrane concentration and evaporative crystallization (MVR or MED), the evaporation process can realize zero emission of desulfurization wastewater, and there are engineering cases for successful operation, but the method has the following defects: the whole system occupies a large area due to the adoption of membrane concentration and evaporative crystallization processes, and the investment cost and the operation cost of the process are high; moreover, the salt generated by evaporative crystallization is generally mixed salt, is difficult to reuse and difficult to treat, and still has the discharge of pollutants, but the waste water is changed into solid waste.
Disclosure of Invention
The invention aims to solve the problems of large system floor area, high process investment cost, high operation cost, difficult treatment of miscellaneous salts generated in the evaporation process and the like of the conventional desulfurization wastewater treatment system and provide a novel desulfurization wastewater treatment system and a novel desulfurization wastewater treatment method.
In order to achieve the above object, the present invention provides a desulfurization wastewater treatment system, comprising:
the pretreatment device is used for pretreating the desulfurization wastewater to remove divalent ions in the desulfurization wastewater;
the electrolysis device is used for electrolyzing the pretreated desulfurization wastewater;
the gas-liquid separation device is used for carrying out gas-liquid separation on the gas-liquid mixture generated in the electrolysis device;
a dechlorination device for dechlorinating the hydrogen separated from the gas-liquid separation device;
the hydrogen pressurizing device is used for pressurizing, cooling and drying the dechlorinated hydrogen; and
and the hydrogen deoxidation device is used for deoxidizing the hydrogen after pressurization, cooling and drying.
Preferably, the pretreatment device comprises a pH value adjusting box, a reaction box, a flocculation box, a sedimentation box and a multi-media filter which are connected in sequence.
Preferably, the pH value adjusting box comprises a box body, a mixer, an acid liquid adding device, an alkali liquid adding device and a pH detector, wherein a main liquid inlet end of the mixer is connected with a desulfurization wastewater inlet, an auxiliary liquid inlet end of the mixer is connected to the acid liquid adding device and the alkali liquid adding device, and the pH detector is arranged between an outlet of the mixer and a liquid inlet of the box body.
Preferably, the settling tank comprises a tank body, a liquid inlet central pipe and an overflow weir, wherein the outlet at the lower end of the liquid inlet central pipe is 10-30cm away from the bottom of the tank body, and the overflow weir is arranged on the upper part of the inner wall of the tank body in a surrounding manner.
Preferably, the upper edge of the overflow weir is of a zigzag structure.
Preferably, the filtering material filled in the multi-media filter is one or any combination of at least two of quartz sand, activated carbon and anthracite.
Preferably, the electrolytic cell adopted by the electrolytic device is a plate electrode tube type electrolytic cell, a plate mesh type electrode plate type electrolytic cell or a concentric circular tube type electrolytic cell.
Preferably, the system further comprises a pickling device for cleaning scales generated during the operation of the electrolytic device.
Preferably, the hydrogen deoxidation device comprises a hydrogen primary deoxidation unit and a hydrogen secondary deoxidation unit, wherein the hydrogen primary deoxidation unit adopts a gas separation membrane for deoxidation, and the hydrogen secondary deoxidation unit adopts a palladium catalyst for deoxidation.
Preferably, the hydrogen deoxygenation device further comprises a hydrogen tertiary deoxygenation unit arranged behind the hydrogen secondary deoxygenation unit, and the hydrogen tertiary deoxygenation unit is deoxygenated by adopting a temperature and pressure swing adsorption device.
The invention also provides a desulfurization wastewater treatment method, which comprises the following steps:
(1) Pretreating desulfurization wastewater, and removing divalent ions in the desulfurization wastewater through flocculation and precipitation;
(2) Electrolyzing the pretreated desulfurization wastewater to generate a gas-liquid mixture containing a sodium hypochlorite solution and hydrogen;
(3) Performing gas-liquid separation on the gas-liquid mixture to separate into a sodium hypochlorite solution as a liquid phase and hydrogen as a gas phase;
(4) Dechlorinating the separated hydrogen to remove chlorine gas entrained in the hydrogen;
(5) Pressurizing, cooling and drying the dechlorinated hydrogen; and
(6) And deoxidizing the hydrogen after pressurization and cooling drying.
Preferably, the deoxidation comprises:
carrying out primary deoxidation by adopting a gas separation membrane;
carrying out secondary deoxidation by adopting a palladium catalyst; and
optionally, three deoxygenations are performed using a temperature and pressure swing adsorption unit.
According to the method and the system for treating the desulfurization wastewater, the desulfurization wastewater is pretreated, most of divalent ions are removed through flocculation and precipitation, the rest of divalent ions in a water body are basically sodium ions and chloride ions, then the chloride ions can be converted into sodium hypochlorite through electrolysis, the sodium hypochlorite can be used for plant disinfection, and pure hydrogen can be obtained through dechlorination, pressurization, cooling, drying and deoxidation of hydrogen generated in the electrolysis process. Therefore, the desulfurization wastewater is treated according to the technical scheme of the invention, the whole process does not generate discharged waste, and the whole system has small floor area and lower process investment cost and operation cost.
Drawings
FIG. 1 is a schematic view of a desulfurization waste water treatment system according to the present invention;
FIG. 2 is a schematic view of a pretreatment device in the desulfurization wastewater treatment system according to the present invention;
FIG. 3 is a flow chart of the desulfurization waste water treatment method of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, the desulfurization wastewater treatment system of the present invention comprises a pretreatment device, an electrolysis device, a gas-liquid separation device, a dechlorination device, a hydrogen pressurization device, and a hydrogen deoxygenation device, which are connected in sequence.
In the desulfurization wastewater treatment system, the pretreatment device is used for pretreating desulfurization wastewater to remove divalent ions in the desulfurization wastewater. In one embodiment, as shown in fig. 2, the pretreatment device comprises a pH adjusting tank, a reaction tank, a flocculation tank, a sedimentation tank and a multi-media filter which are connected in sequence.
In the pretreatment device, the pH value adjusting box comprises a box body, a mixer, an acid liquor adding device, an alkali liquor adding device and a pH detector. The main feed liquor end and the desulfurization waste water access connection of blender, the supplementary feed liquor end of blender is connected to acidizing fluid is thrown with device and alkali lye and is thrown with the device, the pH detector set up in the export of blender with between the inlet of box, specifically, the pH detector set up in the blender with the junction of box.
The acid liquid adding device comprises an acid liquid metering pump, an inlet of the acid liquid adding device is connected to an acid liquid storage tank, and acid liquid is injected into the mixer through the acid liquid metering pump.
The liquid-reducing adding device comprises an alkali liquor metering pump, an inlet of the alkali liquor adding device is connected to an alkali liquor storage tank, and alkali liquor is injected into the mixer through the alkali liquor metering pump.
The mixer may be selected from the group consisting of a static mixer, a dynamic mixer, and a line mixer.
In the pretreatment device, the reaction tank comprises a medicament feeding metering pump. The medicament added by the medicament adding and metering pump can be sodium carbonate, sodium hydroxide and the like, and the medicament adding and metering pump is correspondingly connected to respective liquid storage tanks.
In the pretreatment device, the flocculation tank comprises a flocculating agent feeding metering pump. The flocculant adding metering pump is connected to a flocculant storage tank, and the flocculant used can be selected conventionally in the field, and can be at least one of polyaluminium chloride, ferric chloride, ferrous sulfate, alum and aluminum sulfate.
In the pretreatment device, preferably, the settling tank comprises a tank body, a liquid inlet central pipe and an overflow weir, wherein the lower end outlet of the liquid inlet central pipe is 10-30cm away from the bottom of the tank body, and the overflow weir is arranged on the upper part of the inner wall of the tank body in a surrounding manner. According to the settling tank with the preferable structure, a better flocculation and sedimentation effect can be obtained. The configuration of the upper edge of the weir is not particularly limited. In a more preferred embodiment, the upper edge of the overflow weir is of a zigzag structure. The sawtooth structure can overcome the surface tension of water and promote the water flow to be uniform. In particular embodiments, the zigzag shape forming the upper edge of the weir may be square, semi-circular, triangular, or the like.
In the pretreatment device, the multi-media filter includes a tank and a filter material filled in the tank. The tank body can be made of glass fiber reinforced plastics, carbon steel lining plastics and the like. The filtering material filled in the multi-media filter is preferably one or any combination of at least two of quartz sand, activated carbon and anthracite.
In the desulfurization wastewater treatment system, the electrolysis device is used for electrolyzing the pretreated desulfurization wastewater to generate a sodium hypochlorite solution and hydrogen. The electrolysis device comprises an electrolysis bath and a power supply. The electrolytic bath is preferably a plate electrode tube type electrolytic bath, a plate mesh type electrode plate type electrolytic bath or a concentric circular tube type electrolytic bath. The power supply can adopt high-frequency current-stabilizing switch voltage and can also adopt a silicon controlled rectifier power supply. The electrolytic bath is preferably connected with the power supply through a cable or a copper bar.
In the desulfurization wastewater treatment system, preferably, the system further comprises a pickling device for cleaning scales generated during the operation of the electrolysis device. In a more preferred embodiment, the acid wash apparatus includes an acid wash tank, an acid discharge pump, an acid wash pump, and an acid mist absorber. The pickling tank can be a PE tank body, a glass steel tank body or a steel-lined glue tank body. The acid discharge pump can adopt a magnetic pump or a centrifugal pump. The pickling pump can adopt a magnetic pump and can also adopt a centrifugal pump. The interior of the acid mist absorber can be filled with fillers such as Raschig rings and the like, and is filled with sodium hydroxide solution. The inlet of the acid unloading pump is connected with the pickling solution tank body, and the outlet of the acid unloading pump is connected with the pickling tank. The inlet of the pickling pump is connected with the pickling tank, the outlet of the pickling pump is connected with the inlet of the electrolytic cell, and the outlet of the pickling solution of the electrolytic cell is connected with the pickling tank. The inlet of the acid mist absorber is connected with the gas phase outlet at the top of the pickling tank.
In the desulfurization wastewater treatment system, the gas-liquid separation device is used for carrying out gas-liquid separation on the gas-liquid mixture generated in the electrolysis device. The inlet of the gas-liquid separation device is connected with the outlet of the electrolytic cell of the electrolytic device, the liquid outlet of the gas-liquid separation device is connected with the sodium hypochlorite solution storage tank, and the gas outlet of the gas-liquid separation device is connected with the gas inlet of the dechlorination device. In a more preferred embodiment, the inside of the gas-liquid separator has a spiral structure, and the liquid introduced into the gas-liquid separator centrifugally moves along the spiral structure of the gas-liquid separator to centrifugally separate the gas from the liquid, thereby separating the gas into a sodium hypochlorite solution as a liquid phase and a hydrogen gas as a gas phase.
In the desulfurization wastewater treatment system, the dechlorination device is used for dechlorinating the hydrogen separated in the gas-liquid separation device. The dechlorination device comprises a dechlorination tower, an alkali liquor tank and an alkali liquor pump. Wherein the dechlorination tower adopts a cylindrical tank body, and spray pipes are uniformly distributed in the dechlorination tower; the alkali liquor tank is made of a sodium hypochlorite corrosion resistant material; the lye pump can adopt a stainless steel centrifugal pump. The inlet of the alkali liquor pump is connected with the alkali liquor tank, and the outlet of the alkali liquor pump is connected with the spray pipe in the dechlorination tower.
In the desulfurization wastewater treatment system, the hydrogen pressurization device is used for pressurizing, cooling and drying the dechlorinated hydrogen. The hydrogen pressurizing device can adopt a hydrogen compressor and also can adopt a gas booster pump. The inlet of the hydrogen pressurizing device is connected with the gas outlet of the dechlorinating device. The gas pressurizing device also comprises a hydrogen gas cooling and drying device, and can be cooled by a gas air cooler or a cooling dryer.
In the desulfurization wastewater treatment system, the hydrogen deoxidation device is used for deoxidizing the hydrogen after pressurization and cooling drying. In a more preferred embodiment, the hydrogen deoxygenation device comprises a hydrogen primary deoxygenation unit, a hydrogen secondary deoxygenation unit and an optional hydrogen tertiary deoxygenation unit, wherein the hydrogen primary deoxygenation unit is deoxygenated by adopting a gas separation membrane to separate hydrogen and oxygen, and an inlet of the hydrogen primary deoxygenation unit is connected with an outlet of the hydrogen pressurization device; the hydrogen secondary deoxidation unit adopts a palladium catalyst for deoxidation, and an inlet of the hydrogen secondary deoxidation unit is connected with an outlet of the hydrogen primary deoxidation unit; the hydrogen tertiary deoxidation unit adopts a temperature and pressure swing adsorption device for deoxidation, and an inlet of the hydrogen tertiary deoxidation unit is connected with an outlet of the hydrogen secondary deoxidation unit.
The invention also provides a desulfurization wastewater treatment method, as shown in figure 3, the method comprises the following steps:
(1) Pretreating desulfurization wastewater, and removing divalent ions in the desulfurization wastewater through flocculation and precipitation;
(2) Electrolyzing the pretreated desulfurization wastewater to generate a gas-liquid mixture containing a sodium hypochlorite solution and hydrogen;
(3) Performing gas-liquid separation on the gas-liquid mixture to separate into a sodium hypochlorite solution as a liquid phase and hydrogen as a gas phase;
(4) Dechlorinating the separated hydrogen to remove chlorine gas entrained in the hydrogen;
(5) Pressurizing, cooling and drying the dechlorinated hydrogen; and
(6) And deoxidizing the hydrogen after pressurization and cooling drying.
In a preferred embodiment, the desulfurization waste water treatment method is implemented by using the desulfurization waste water treatment system described above.
In another preferred embodiment, the deoxidation comprises:
carrying out primary deoxidation by adopting a gas separation membrane;
carrying out secondary deoxidation by adopting a palladium catalyst; and
optionally, three deoxygenations are performed using a temperature and pressure swing adsorption unit.
According to the desulfurization wastewater treatment method, the desulfurization wastewater is treated, so that a sodium hypochlorite solution and a relatively pure hydrogen product can be obtained, and no waste is discharged in the whole process.
The desulfurization wastewater treatment system and method of the present invention are further illustrated by the following examples. The embodiments are implemented on the premise of the technical scheme of the invention, and detailed implementation modes and specific operation processes are given, but the scope of the invention is not limited to the following embodiments.
The experimental procedures in the following examples are, unless otherwise specified, conventional in the art. The experimental materials used in the following examples are commercially available unless otherwise specified.
The exfoliation wastewater used in the following examples contained 18g/L of chloride ions, 11.4g/L of sodium ions, 0.2g/L of sulfate ions, 0.2g/L of calcium ions, and 0.05g/L of magnesium ions.
Example 1
As shown in fig. 1-2, the desulfurization wastewater treatment system used in this embodiment includes a pretreatment device, an electrolysis device, a gas-liquid separation device, a dechlorination device, a hydrogen pressurization device, a hydrogen deoxidation device, and a pickling device for cleaning the electrolysis device, which are connected in sequence, wherein the pretreatment device includes a pH adjustment tank, a reaction tank, a flocculation tank, a settling tank, and a multi-media filter, which are connected in sequence. The pH value regulating box comprises a box body, a mixer, an acid liquor feeding device, an alkali liquor feeding device and a pH detector, wherein a main liquid inlet end of the mixer is connected with a desulfurization wastewater inlet, an auxiliary liquid inlet end of the mixer is connected to the acid liquor feeding device and the alkali liquor feeding device, and the pH detector is arranged at the joint of the mixer and the box body. The settling tank comprises a tank body, a liquid inlet central pipe and an overflow weir, wherein the outlet of the lower end of the liquid inlet central pipe is 10-30cm away from the bottom of the tank body, the overflow weir is arranged on the upper portion of the inner wall of the tank body in a surrounding mode, and the upper edge of the overflow weir is of a sawtooth structure. The multi-media filter comprises a tank body and a filter material filled in the tank body, wherein the filter material is quartz sand. The electrolysis device comprises an electrolysis bath and a power supply, wherein the electrolysis bath is a plate electrode tube type electrolysis bath. The acid cleaning device comprises an acid cleaning tank, an acid cleaning pump and an acid mist absorber, wherein an inlet of the acid cleaning pump is connected with an acid cleaning solution tank body, an outlet of the acid cleaning pump is connected with the acid cleaning tank, an inlet of the acid cleaning pump is connected with the acid cleaning tank, an outlet of the acid cleaning pump is connected with an inlet of the electrolytic cell, an outlet of the acid cleaning solution of the electrolytic cell is connected with the acid cleaning tank, and an inlet of the acid mist absorber is connected with a gas phase outlet at the top of the acid cleaning tank. The inlet of the gas-liquid separation device is connected with the outlet of the electrolytic cell of the electrolytic device, the liquid outlet of the gas-liquid separation device is connected with the sodium hypochlorite solution storage tank, and the gas outlet of the gas-liquid separation device is connected with the gas inlet of the dechlorination device. The dechlorination device comprises a dechlorination tower, an alkali liquor tank and an alkali liquor pump, spray pipes are uniformly distributed in the dechlorination tower, an inlet of the alkali liquor pump is connected with the alkali liquor tank, and an outlet of the alkali liquor pump is connected with the spray pipes in the dechlorination tower. The hydrogen pressurization device adopts a hydrogen compressor, and the inlet of the hydrogen pressurization device is connected with the gas outlet of the dechlorination device. The hydrogen deoxygenation device comprises a primary hydrogen deoxygenation unit, a secondary hydrogen deoxygenation unit and a tertiary hydrogen deoxygenation unit, wherein the primary hydrogen deoxygenation unit is deoxygenated by adopting a gas separation membrane to separate hydrogen and oxygen, and an inlet of the primary hydrogen deoxygenation unit is connected with an outlet of the hydrogen pressurization device; the hydrogen secondary deoxidation unit adopts a palladium catalyst for deoxidation, and an inlet of the hydrogen secondary deoxidation unit is connected with an outlet of the hydrogen primary deoxidation unit; the hydrogen tertiary deoxidation unit adopts a temperature and pressure swing adsorption device for deoxidation, and an inlet of the hydrogen tertiary deoxidation unit is connected with an outlet of the hydrogen secondary deoxidation unit.
The desulfurization wastewater treatment process comprises the following steps: injecting desulfurization wastewater into the desulfurization wastewater treatment system for treatment, and adding flocculant polyaluminum chloride (obtained from Jinan Jiayang chemical Co., ltd., wherein Al is added) into the pretreatment device 2 O 3 More than or equal to 28 percent) and removing divalent ions in the desulfurization wastewater through flocculation and precipitation; then, electrolyzing the pretreated desulfurization wastewater in an electrolysis device to generate a gas-liquid mixture containing a sodium hypochlorite solution and hydrogen; then, performing gas-liquid separation on the gas-liquid mixture to separate the gas-liquid mixture into a sodium hypochlorite solution as a liquid phase and hydrogen as a gas phase; secondly, dechlorinating the separated hydrogen to remove trace chlorine gas carried in the hydrogen; subsequently, the dechlorinated hydrogen is pressurized, cooled and dried; then, the hydrogen gas after pressurization and cooling drying was deoxygenated three times. The purity of the hydrogen prepared by the method is 99.999 percent, and the prepared hydrogen is used as a catalystThe concentration of the sodium chlorate solution is 8g/L, and the amount of the prepared hydrogen is 1800L for each cubic meter of the desulfurization wastewater.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (12)
1. A desulfurization wastewater treatment system, comprising:
the pretreatment device is used for pretreating the desulfurization wastewater to remove divalent ions in the desulfurization wastewater;
the electrolysis device is used for electrolyzing the pretreated desulfurization wastewater;
the gas-liquid separation device is used for carrying out gas-liquid separation on the gas-liquid mixture generated in the electrolysis device;
a dechlorination device for dechlorinating the hydrogen separated from the gas-liquid separation device;
the hydrogen pressurizing device is used for pressurizing, cooling and drying the dechlorinated hydrogen; and
and the hydrogen deoxidation device is used for deoxidizing the hydrogen after pressurization, cooling and drying.
2. The system of claim 1, wherein the pretreatment device comprises a pH value adjusting tank, a reaction tank, a flocculation tank, a sedimentation tank and a multi-media filter which are connected in sequence.
3. The system according to claim 2, wherein the pH value adjusting box comprises a box body, a mixer, an acid liquid adding device, an alkali liquid adding device and a pH detector, a main liquid inlet end of the mixer is connected with a desulfurization wastewater inlet, an auxiliary liquid inlet end of the mixer is connected to the acid liquid adding device and the alkali liquid adding device, and the pH detector is arranged between an outlet of the mixer and a liquid inlet of the box body.
4. The system of claim 2, wherein the settling tank comprises a tank body, a liquid inlet central pipe and an overflow weir, a lower end outlet of the liquid inlet central pipe is 10-30cm away from the bottom of the tank body, and the overflow weir is arranged on the upper part of the inner wall of the tank body in a surrounding manner.
5. The system of claim 4, wherein the upper edge of the weir is a saw-tooth configuration.
6. The system according to claim 2, wherein the filtering material filled in the multi-media filter is one or any combination of at least two of quartz sand, activated carbon and anthracite.
7. The system of claim 1, wherein the electrolyzer used in the electrolyzer is a plate electrode tube electrolyzer, a plate mesh type electrode plate electrolyzer or a concentric circular tube electrolyzer.
8. The system of any one of claims 1-7, further comprising a pickling unit for cleaning scale generated during operation of the electrolysis unit.
9. The system according to any one of claims 1 to 7, wherein the hydrogen deoxygenation device comprises a hydrogen primary deoxygenation unit and a hydrogen secondary deoxygenation unit, the hydrogen primary deoxygenation unit is deoxygenated by using a gas separation membrane, and the hydrogen secondary deoxygenation unit is deoxygenated by using a palladium catalyst.
10. The system of claim 9, wherein the hydrogen deoxygenation device further comprises a hydrogen tertiary deoxygenation unit disposed after the hydrogen secondary deoxygenation unit, wherein the hydrogen tertiary deoxygenation unit is deoxygenated using a temperature swing adsorption device.
11. A desulfurization wastewater treatment method is characterized by comprising the following steps:
(1) Pretreating desulfurization wastewater, and removing divalent ions in the desulfurization wastewater through flocculation and precipitation;
(2) Electrolyzing the pretreated desulfurization wastewater to generate a gas-liquid mixture containing a sodium hypochlorite solution and hydrogen;
(3) Performing gas-liquid separation on the gas-liquid mixture to separate the gas-liquid mixture into a sodium hypochlorite solution serving as a liquid phase and hydrogen serving as a gas phase;
(4) Dechlorinating the separated hydrogen to remove chlorine gas entrained in the hydrogen;
(5) Pressurizing, cooling and drying the dechlorinated hydrogen; and
(6) And deoxidizing the hydrogen after pressurization and cooling drying.
12. The method of claim 11, wherein the deoxygenating comprises:
carrying out primary deoxidation by adopting a gas separation membrane;
carrying out secondary deoxidation by adopting a palladium catalyst; and
optionally, three deoxygenations are performed using a temperature and pressure swing adsorption unit.
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| CN202211001269.2A CN115367930A (en) | 2022-08-19 | 2022-08-19 | Desulfurization wastewater treatment system and method |
| PCT/CN2023/091495 WO2024037041A1 (en) | 2022-08-19 | 2023-04-28 | Desulfurization wastewater treatment system and method |
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| WO2024037041A1 (en) * | 2022-08-19 | 2024-02-22 | 国家能源集团新能源技术研究院有限公司 | Desulfurization wastewater treatment system and method |
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| JP4955015B2 (en) * | 2005-12-20 | 2012-06-20 | セラマテック・インク | Electrolytic process of sodium hypochlorite production using Na ion conductive ceramic membrane |
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| CN106967996A (en) * | 2017-04-18 | 2017-07-21 | 碧海舟（北京）节能环保装备有限公司 | The hydrogen manufacturing of clean energy resource seawater and sodium hypochlorite system |
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| CN106567103A (en) * | 2016-11-08 | 2017-04-19 | 中广核工程有限公司 | Co-production method and system for sodium hypochlorite and high-purity hydrogen |
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