CN108371879B - System and method for carrying out electrolytic treatment on high-chlorine desulfurization wastewater and coupling denitration and demercuration - Google Patents

System and method for carrying out electrolytic treatment on high-chlorine desulfurization wastewater and coupling denitration and demercuration Download PDF

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CN108371879B
CN108371879B CN201810208255.5A CN201810208255A CN108371879B CN 108371879 B CN108371879 B CN 108371879B CN 201810208255 A CN201810208255 A CN 201810208255A CN 108371879 B CN108371879 B CN 108371879B
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flue gas
desulfurization
chlorine
waste water
desulfurization wastewater
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CN108371879A (en
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胡将军
汪远
张萌
胡泽
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Wuhan University WHU
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Abstract

The invention discloses a method and a system for zero-emission treatment of high-chlorine desulfurization wastewater and promotion of simultaneous demercuration and denitration of flue gas. Firstly, carrying out reverse reflux concentration on the desulfurization wastewater and part of flue gas, pretreating the wastewater, and pumping the pretreated wastewater into a cathode chamber of an electrolysis system to obtain alkaline slurry containing high-concentration chloride ions; the alkaline slurry flows back to the pretreatment coagulating sedimentation tank, high-concentration chloride ions penetrate through the anion exchange membrane to enter the anode chamber, chlorine and oxygen are generated by electrolysis in the anode chamber, and the chlorine, the oxygen, the anolyte and air are mixed and then enter the front SCO system to participate in Hg0And oxidation of part of the NO. The method carries out ex-situ coupling on the treatment of high-chlorine desulfurization wastewater and the denitration and demercuration of flue gas, not only achieves the aim of zero emission of the desulfurization wastewater, but also solves the problem of Hg through synchronous oxidation0Pollution problem and increase of NO in flue gas2The content of the denitration catalyst promotes the denitration reaction of the rapid SCR, and the denitration and demercuration of the flue gas are realized at the same time.

Description

System and method for carrying out electrolytic treatment on high-chlorine desulfurization wastewater and coupling denitration and demercuration
Technical Field
The invention belongs to the field of desulfurization wastewater treatment, and particularly relates to a method and a system for zero-emission treatment of high-chlorine desulfurization wastewater and promotion of simultaneous demercuration and denitration of flue gas.
Background
The coal-fired boiler wet flue gas desulfurization system (WFGD) discharges desulfurization waste water in the desulfurization process, the waste water contains a large amount of suspended matters, gypsum components, silicon dioxide and heavy metals, and the discharged waste water is the desulfurization waste water. The mass concentration of suspended substances in the desulfurization wastewater is 9000-12700 mg/L, the desulfurization wastewater containing heavy metals such as mercury, lead, nickel, zinc, cadmium, chromium and the like and nonmetallic pollutants such as arsenic, fluorine and the like is weak acidic (the pH is 4-6), and simultaneously contains a large amount of chloride ions (the concentration is 8000-20000 mg/L); on the other hand, in order to ensure the operation stability of the desulfurization system, the concentration of chloride ions in the slurry needs to be controlled to be lower than 20000mg/L, so that the chlorine-containing desulfurization wastewater cannot be reused in the desulfurization system for infinite times. In order to maintain the balance of the materials of the slurry circulation system of the desulfurization unit, prevent the concentration of the soluble fraction, i.e., chlorine, in the flue gas from exceeding a specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system.
At present, the treatment modes for desulfurization wastewater of coal-fired boilers at home and abroad are as follows: 1) and (6) neutralizing. Removing water as solid waste landfill by a filter press, drying and the like after treatment by neutralization, flocculation, precipitation, oxidation and the like; 2) evaporating through a flue between the electric dust collector and the heat exchanger; 3) the wastewater is treated by a wastewater treatment system independently and then is discharged after reaching the standard; 4) treating the desulfurization wastewater by membrane technologies such as electrodialysis, forward osmosis, reverse osmosis and the like; 5) the high-chlorine desulfurization wastewater is treated by adopting technologies such as multi-effect evaporation, membrane fractionation, a fluidized bed, a membrane separation method, ion exchange, electric flocculation and the like. However, these methods have many disadvantages and limitations, such as that the solid landfill technology after neutralization still cannot effectively solve the problem of chloride ions, and additional limestone needs to be added, which causes resource waste; electrodialysis, reverse osmosis and the like can not solve the problems of overhigh content of chloride ions and frequent membrane blockage, and the high-temperature evaporative crystallization technology has high requirements on equipment and high energy consumption.
Along with the social development and the improvement of environmental importance, the problem of mercury pollution of coal-fired flue gas becomes a prominent part of the atmospheric environmental problem, and the flue gas emission threshold of mercury and compounds thereof is regulated to be 0.03mg/m in the atmospheric pollutant emission Standard of thermal power plants (GB 13223-3. The mercury pollutant in coal-fired flue gas exists in three forms in the flue, namely, Hg in a particle statep、Hg2+The two proportions are only about 6-30%, and the Hg is easy to be wrapped in fly ash and collected by a dust remover or purified in a desulfurizing tower, and elemental Hg is0Has high vapor pressure and is difficult to dissolveIn water, it is not possible to purify it effectively, this part of Hg0The ratio of Hg in the flue gas reaches 70-94 percent0The removal in the flue gas becomes a very important part of the demercuration of the flue gas. At present, Hg in flue gas0The treatment technology comprises activated carbon, modified activated carbon, noble metal catalyst, transition metal oxide and the like. Due to the combined action of physical adsorption and chemical adsorption, the modified activated carbon has a good mercury removal effect, including S, halogen, metal oxide modification and the like. However, such modified activated carbon has high use cost, and can affect the quality of fly ash and increase the difficulty of disposal. Noble metal catalyst to Hg0The method also has a good oxidation removal effect, but the components of the flue gas of the fire coal are complex, and the fire coal in China is mostly low-chlorine coal, so that the activity of the fire coal is reduced, and the cost is self-evident. Other methods are also in the research stage at present, and each method has certain application range and advantages and disadvantages.
The Fast SCR Reaction (Fast SCR Reaction) has been proposed in the early days of this century by providing a catalytic oxidation type catalyst upstream of the SCR unit to convert 50% of the NO in the flue gas to NO2To achieve the SCR process NO and NO2High efficiency denitration reaction (2NO + O) of about 1:12→2NO2，2NH3+NO+NO2→2N2+3H2O). The NO content in the coal-fired flue gas is more than 90 percent, so that 50 percent of NO at the SCR inlet is controlled to be converted into NO by the methods of airspeed regulation and the like2The improvement of the SCR efficiency is greatly promoted, so that the use amount of an SCR catalyst can be reduced to reduce the cost.
Disclosure of Invention
Aiming at the defects of the prior art and combining engineering practice, the invention provides an atmospheric pollution control technology for treating high-chlorine desulfurization wastewater by an electrolytic method and coupling flue gas and simultaneously removing mercury and denitration, thereby realizing comprehensive utilization of resources.
The technical scheme provided by the invention is as follows:
a method for treating high-chlorine desulfurization wastewater by electrolysis and coupling denitration and demercuration comprises the following steps:
(1) a front SCO system is arranged in front of an ammonia injection unit of the SCR system to carry out combustionHg in coal boiler flue gas0And part of the NO; the oxidized flue gas sequentially enters an SCR system for denitration and enters a dust remover for dust removal;
(2) the flue gas after dust removal is shunted and enters a wet flue gas desulfurization system and a desulfurization waste water flue gas concentration tower which are arranged in parallel, the waste water discharged by the wet flue gas desulfurization system enters the top of the desulfurization waste water flue gas concentration tower for spraying and is in countercurrent contact with the flue gas in the desulfurization waste water flue gas concentration tower, and high-chlorine desulfurization waste water and low-temperature flue gas are obtained;
(3) the low-temperature flue gas enters a wet flue gas desulfurization system to remove SO under the action of a draught fan2Then discharged to the atmosphere; the high-chlorine desulfurization wastewater enters a pretreatment coagulation sedimentation tank for neutralization, coagulation and sedimentation;
(4) allowing the high-chlorine desulfurization wastewater treated in the step (3) to enter a cathode chamber for electrolysis to obtain alkaline slurry containing high-concentration chloride ions; the alkaline slurry flows back to the pretreatment coagulating sedimentation tank, high-concentration chloride ions penetrate through the anion exchange membrane to enter the anode chamber, chlorine and oxygen are generated by electrolysis in the anode chamber, and the chlorine, the oxygen, the anolyte and air are mixed and then enter the front SCO system to participate in Hg0And oxidation of part of the NO.
The front SCO system is filled with active alumina filler or catalyst the same as industrial SCR process.
The content of chloride ions in the high-chlorine desulfurization wastewater in the step (2) is not less than 30000 mg/L.
The anode is a rotary ruthenium-titanium mesh electrode.
The cathode chamber adopts an oxygen consumption cathode, and aeration is carried out at the bottom in a blowing mode.
The cathode is a three-dimensional PAN-based porous carbon felt cathode.
A system for treating high-chlorine desulfurization wastewater by electrolysis and coupling denitration and demercuration comprises a preposed SCO system, an SCR system, a dust remover, a wet flue gas desulfurization system and a desulfurization wastewater flue gas concentration tower which are connected in parallel, wherein the preposed SCO system, the SCR system, the dust remover, the wet flue gas desulfurization system and the desulfurization wastewater flue gas concentration tower are sequentially connected through a flue; the bottom of the desulfurization waste water flue gas concentration tower is connected with a flue and is provided with a waste water pipeline, and the top of the desulfurization waste water flue gas concentration tower is connected with a waste water pipe of a wet flue gas desulfurization system and is provided with a return flue for flue gas to flow into the wet flue gas desulfurization system; the wastewater pipeline at the bottom of the desulfurization wastewater flue gas concentration tower is sequentially connected with a pretreatment coagulating sedimentation tank and an electrolysis system, the electrolysis system comprises an anode chamber and a cathode chamber, an anion exchange membrane is arranged between the anode chamber and the cathode chamber, the anode chamber is sequentially connected with a gas-liquid mixing tank and a front SCO system through a pipeline, and the cathode chamber is sequentially connected with a catholyte backflow system and the pretreatment coagulating sedimentation tank through a pipeline.
The front SCO system is filled with activated alumina packing or the same catalyst as the industrial SCR process.
The anode chamber is provided with a stainless steel stirring device or a rotary ruthenium-titanium mesh electrode, and the cathode adopts a three-dimensional PAN-based porous carbon felt cathode.
The bottom of the cathode chamber is provided with a blower.
The system for treating the high-chlorine desulfurization wastewater by electrolysis and coupling denitration and demercuration comprises the following systems:
1. desulfurization wastewater pretreatment system
After contacting the high-chlorine desulfurization wastewater with part of flue gas, obtaining partial concentration (after SCR and before a desulfurization system), and after obtaining concentration (ensuring that the content of chloride ions is about 20000mg/L), entering a pretreatment device, and returning the flue gas participating in concentration to a main pipeline again to enter the desulfurization system together with the main flue gas; the desulfurization wastewater after partial concentration of the high-temperature flue gas enters a pretreatment tank, the pretreatment tank comprises alkaline slurry which flows back from a cathode chamber after electrolysis, the alkaline slurry and the weakly acidic desulfurization wastewater are subjected to neutralization reaction, and the precipitation reaction of metal ions under the alkaline condition is removed from a system after flocculation precipitation under the action of a flocculating agent; after the reaction of interception, precipitation and the like of pretreatment, the high-chlorine desulfurization wastewater enters a cathode chamber of an electrolysis system.
2. Electrolysis system
The electrolysis system consists of an anode chamber, a cathode chamber and an anion exchange membrane;
(1) cathode chamber
The cathode material mainly adopts three-dimensional PAN-based carbon felt, so that the contact area and the oxygen storage capacity are increased; the bottom of the cathode chamber is aerated by blast air to facilitate the uniform mixing of cathode solution, and the aeration is mainly positioned at the lower part of the cathode; the main functions of aeration are two parts: firstly, the dissolved oxygen content near the electrode is increased; but the uniform mixing effect on the cathode solution; the cathode compartment reacts mainly as follows:
2H2O+O2+4e-＝4OH-
alkaline slurry generated by the reaction in the cathode chamber flows back to the pretreatment coagulating sedimentation tank for the desulfurization wastewater.
(2) Anode chamber
The anode electrode adopts a rotary ruthenium-titanium electrode net, mainly generates chlorine evolution and oxygen evolution reactions, and Cl in the high-chlorine desulfurization wastewater in the cathode chamber is generated under the action of an anion exchange membrane-Continuously permeating an anion exchange membrane to enter an anode chamber for Cl-Supplementing, during work, the anode is electrolyzed under the stirring of a stainless steel stirring device, the concentration of chloride ions near the electrode is ensured, and the electrode reaction in the anode chamber is as follows:
2Cl-－2e-＝Cl2↑
2H2O－4e-＝4H++O2↑
3. back-spraying SCO system
The back spray material comprises nascent chlorine, oxygen, HCl-containing electrolyte and compressed air which are generated in an anode chamber, and are mixed to form a gas-liquid two-phase mixture, the gas-liquid two-phase mixture enters a preposed SCO system, and zero-valent mercury and NO are oxidized in the SCO system, and the main reaction is as follows:
Hg+Cl+M＝HgCl+M
HgCl+Cl2＝HgCl2+Cl
Hg+O＝HgO
2NO+Cl2＝2NOCl
NOCl+O＝NO2+Cl
NO+O＝NO2
the invention arranges a preposed SCO system at the injection front end of the SCR system, and simultaneously, nascent chlorine and nascent oxygen generated by anode electrolysis enter the preposed SCO system to be used for Hg0Oxidation and elimination of NH3While completing partial oxidation of NO to promote denitration efficiency in the subsequent SCR process; and the alkali liquor generated by cathode electrolysis flows backPumping the mixture to a desulfurizing tower for SO after the mixture of the limestone slurry tank and the limestone slurry is mixed2Absorption of (2). While SCO process converts part of NO to NO2The subsequent SCR reaction can be accelerated, and the indirect cost reduction can make up for the construction of a front SCO system.
The invention has the following advantages and beneficial effects:
(1) the invention adopts the three-dimensional porous oxygen-consuming cathode, increases the contact area of the electrolytic cathode and the electrolyte, enhances the oxygen storage capacity and simultaneously reduces the cathode discharge potential, and generates a large amount of alkali liquor which can be returned to the pretreatment coagulating sedimentation tank for the high-chlorine desulfurization wastewater for pretreatment of the high-chlorine desulfurization wastewater.
(2) The invention adopts the nascent Cl generated by the rotary electrolytic anode2Oxygen and an electrolyte containing HCl in a cathode electrolyte solution are mixed with air and then returned to a front SCO system for Hg0And NO oxidation, so that the problems of low HCl concentration and insufficient oxidation capacity of the low-chlorine coal in the flue gas Hg oxidation process are solved. Once, NO produced2Can promote Hg0Oxidation of (2); second, NO2The increase of the content can promote the generation of Fast-SCR and improve the subsequent SCR efficiency.
(3) Cl generated in anode chamber of the invention2Flows back to the SCO system to prevent the influence of the ammonia injection process on the oxidation reaction and oxidize NO to generate NO2Can promote the (NH) in the front SCO system4)2SO4And the toxicity of the sulfate to the SCR catalyst is reduced.
(4) The invention realizes zero discharge of the desulfurization wastewater by adopting the electrolysis technology and the ectopic coupling oxidation, and solves the problem of high Cl in the desulfurization wastewater-The discharge problem of salt-containing wastewater; realizing the ectopic coupling oxidation of Hg by an electrolysis technology0And NO, solves Hg in the smoke0Thereby promoting the improvement of the denitrification effect of the SCR.
Drawings
FIG. 1 is a flow chart of a process for treating high-chlorine desulfurization wastewater by electrolysis while coupling denitration and demercuration; the system comprises a coal-fired boiler 1, a 2-front SCO system, a 3-SCR system, a 4-electric dust remover, a 5-flue gas shunt pipeline, a 6-flue gas return pipeline, a 7-desulfurization wastewater flue gas concentration tower, an 8-wet flue gas desulfurization system, a 9-chimney, a 10-pump, an 11-desulfurization wastewater pipeline system, a 12-pretreatment coagulating sedimentation tank, a 13-electrolysis system, a 14-anion exchange membrane, a 15-anode chamber, a 16-cathode chamber, a 17-air blower, an 18-gas-liquid mixing tank and a 19-cathode electrolyte return system.
Detailed Description
The invention provides a treatment method and a treatment system for treating high-chlorine desulfurization wastewater by an electrolytic method and coupling synchronous denitration and demercuration, which are further described by combining the accompanying drawings and examples, but the contents of the examples are not used for limiting the protection scope of the invention.
As shown in fig. 1, an electrolytic treatment high-chlorine desulfurization wastewater and coupling denitration and demercuration system comprises a preposed SCO system, an SCR system, a dust remover, a wet flue gas desulfurization system and a desulfurization wastewater flue gas concentration tower which are connected in parallel, which are connected in sequence through a flue; the bottom of the desulfurization waste water flue gas concentration tower is connected with a flue and is provided with a waste water pipeline, and the top of the desulfurization waste water flue gas concentration tower is connected with a waste water pipe of a wet flue gas desulfurization system and is provided with a return flue for flue gas to flow into the wet flue gas desulfurization system; the wastewater pipeline at the bottom of the desulfurization wastewater flue gas concentration tower is sequentially connected with a pretreatment coagulating sedimentation tank and an electrolysis system, the electrolysis system comprises an anode chamber and a cathode chamber, an anion exchange membrane is arranged between the anode chamber and the cathode chamber, the anode chamber is sequentially connected with a gas-liquid mixing tank and a front SCO system through a pipeline, and the cathode chamber is sequentially connected with a catholyte backflow system and the pretreatment coagulating sedimentation tank through a pipeline.
The front SCO system is filled with activated alumina packing or the same catalyst as the industrial SCR process.
Flue gas generated by the coal-fired boiler enters a preposed SCO system before an ammonia injection unit of an SCR system to Hg0Oxidizing part of NO (the used oxidant is nascent chlorine generated by an electrolysis anode), and then enabling the flue gas to enter an SCR system for denitration reaction; then, the flue gas enters an electric dust collector to remove particulate matters in the flue gas; after dust removal, starting flue gas diversion under the action of a draught fan; as shown in FIG. 1, most of the flue gas enters the wet flue gas desulfurization system directly, and the part of the flue gas is about 70%; and about 30% of the smoke is inThe flue gas enters the bottom of a desulfurization waste water flue gas concentration tower through a flue gas diversion pipeline under the action of an induced draft fan, the waste water discharged by a wet flue gas desulfurization system enters the top of the desulfurization waste water flue gas concentration tower for spraying, the desulfurization waste water is partially concentrated after countercurrent contact, the cooled flue gas enters a main pipeline again through a flue return pipe under the action of the induced draft fan, then the flue gas is merged into the wet flue gas desulfurization system, and the flue gas treated by the wet flue gas desulfurization system is discharged into the atmosphere through a chimney; the desulfurization wastewater of the wet flue gas desulfurization system enters the top of a desulfurization wastewater high-temperature flue gas concentration tower through a desulfurization wastewater drainage pipeline, is partially concentrated and then enters a pretreatment coagulating sedimentation tank through a pump and a desulfurization wastewater pipeline system; the desulfurization wastewater in the pretreatment coagulating sedimentation tank and alkaline electrolyte at the cathode of a reflux electrolysis system are subjected to neutralization sedimentation reaction, sedimentation is performed under the action of a flocculating agent, and the pretreated high-chlorine desulfurization wastewater enters a cathode chamber of the electrolysis system to be subjected to electrolysis reaction; high-concentration chloride ions penetrate through the anion exchange membrane to enter the anode chamber, generate nascent chlorine and oxygen under the action of electrolysis, then enter the gas-liquid mixing tank with air introduced by the air blower under the action of the induced draft fan, and then enter the front SCO system for Hg in the mixed gas0And oxidation of NO. The method solves the problem of chloride ion discharge of the desulfurization wastewater and realizes zero discharge of the desulfurization wastewater and Hg0In the simultaneous catalytic oxidation, the catalytic oxidation increases NO2The content of the active carbon in the SCR catalyst is increased, the denitrification effect in the SCR reaction process is improved, a rapid SCR reaction system is formed, and the time of an SCR reaction section is shortened.
The invention relates to a method for coupling and simultaneously denitrifying and removing mercury in the process of electrolyzing high-chlorine desulfurization wastewater, which comprises the following steps:
(1) firstly, partial concentration is carried out on the flue gas desulfurization wastewater, and the concentration method adopts a mode of shunting high-temperature flue gas evaporation concentration by a desulfurization wastewater flue gas concentration tower 7 shown in figure 1 and is used for ensuring that the content of chloride ions is not lower than 30000 mg/L;
(2) pumping the partially concentrated high-chlorine desulfurization wastewater into a desulfurization wastewater pretreatment coagulating sedimentation tank, wherein the pH of the desulfurization wastewater is 4-6, the pH of the desulfurization wastewater is obviously increased in the system under the action of an electrolytic cathode alkaline reflux liquid and a flocculating agent, reactions such as neutralization and coagulating sedimentation occur, particulate matters in the desulfurization wastewater are removed from the system through slag discharge after coagulating sedimentation, and metal ions such as Ca, Mg, Al, Fe, Cr, Hg, Cd and the like generate precipitates under the alkaline condition and the action of the flocculating agent and are removed together because the reflux pH of an alkali liquor is adjusted to be 8-10;
(3) the pretreated desulfurization wastewater enters a cathode chamber of an electrolysis system, and 20000mg/L NaCl solution is adopted as an anode in a starting stage; the cathode chamber electrode adopts a three-dimensional PAN-based carbon felt cathode, has larger comparative area and oxygen storage capacity, the bottom of the electrode chamber adopts a bubbling aeration and air mixing mode, and aeration is mainly positioned at the lower part of the anode electrode; the main functions of aeration are two parts: firstly, the dissolved oxygen content near the electrode is increased; secondly, the electrode solution is uniformly mixed, so that the mass transfer effect is enhanced; the cathode compartment is alkaline and the main reactions are as follows:
2H2O+O2+4e-＝4OH-
the side reactions also include: ca. Precipitation reaction of metal ions such as Mg, Al, Fe and the like under alkaline conditions. Continuous water feeding is adopted, and the pH value is controlled to be about 12-13 during normal operation.
(4) Under the action of anion exchange membrane, Cl in the high-chlorine desulfurization wastewater in the cathode chamber-Continuously penetrates through an anion exchange membrane to enter an anode chamber, and the anode of the electrolysis chamber generates an electrolysis reaction under the action of a rotating ruthenium-titanium electrode network as follows:
2Cl-－2e-＝Cl2↑
2H2O－4e-＝4H++O2↑
under the normal operation condition, the electrolyte in the anode chamber is stirred by the mechanical stirring device to enhance the mixing of the electrolyte and enhance the mass transfer effect;
(5) subsequently, nascent Cl is produced2The oxygen is uniformly mixed with air introduced by a blower in an air mixing tank and then sprayed back to a preposed SCO system, and zero-valent mercury and NO are oxidized on the surface of a carrier or a catalyst, and the main reaction is as follows:
Hg+Cl+M＝HgCl+M
HgCl+Cl2＝HgCl2+Cl
Hg+O＝HgO
side main reaction: 2NO + Cl2＝2NOCl
NOCl+O＝NO2+Cl
NO+O＝NO2
The invention solves the problem of discharging chloride ions in the desulfurization wastewater and realizes zero discharge of the desulfurization wastewater and Hg0Simultaneous catalytic oxidation of (2) with the catalytic oxidation increasing NO2The content of the active carbon in the SCR catalyst is increased, the denitrification effect in the SCR reaction process is improved, a rapid SCR reaction system is formed, and the time of an SCR reaction section is shortened.
The foregoing embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the present invention. Many other variations and modifications in the form and details of the disclosed embodiments will become apparent to those skilled in the art upon reading the foregoing description. But it is understood that obvious variations or modifications can be made within the scope of the present invention.

Claims (10)

1. A method for treating high-chlorine desulfurization wastewater by electrolysis and coupling denitration and demercuration is characterized by comprising the following steps:
(1) a front SCO system is arranged in front of an ammonia injection unit of the SCR system to combust Hg in flue gas of the coal-fired boiler0And part of the NO; the oxidized flue gas sequentially enters an SCR system for denitration and enters a dust remover for dust removal;
(2) the flue gas after dust removal is shunted and enters a wet flue gas desulfurization system and a desulfurization waste water flue gas concentration tower which are arranged in parallel, the waste water discharged by the wet flue gas desulfurization system enters the top of the desulfurization waste water flue gas concentration tower for spraying and is in countercurrent contact with the flue gas in the desulfurization waste water flue gas concentration tower, and high-chlorine desulfurization waste water and low-temperature flue gas are obtained;
(3) the low-temperature flue gas enters a wet flue gas desulfurization system to remove SO under the action of a draught fan2Then discharged to the atmosphere; the high-chlorine desulfurization wastewater enters a pretreatment coagulation sedimentation tank for neutralization, coagulation and sedimentation;
(4) high chlorine desulfurization waste treated in step (3)Water enters a cathode chamber for electrolysis to obtain alkaline slurry containing high-concentration chloride ions; the alkaline slurry flows back to the pretreatment coagulating sedimentation tank, high-concentration chloride ions penetrate through the anion exchange membrane to enter the anode chamber, chlorine and oxygen are generated by electrolysis in the anode chamber, and the chlorine, the oxygen, the anolyte and air are mixed and then enter the front SCO system to participate in Hg0And oxidation of NO.
2. The method of claim 1, wherein: the front SCO system is filled with active alumina filler or catalyst the same as industrial SCR process.
3. The method of claim 1, wherein: the content of chloride ions in the high-chlorine desulfurization wastewater in the step (2) is not less than 30000 mg/L.
4. The method of claim 1, wherein: the anode is a rotary ruthenium-titanium mesh electrode.
5. The method of claim 1, wherein: the cathode chamber adopts an oxygen consumption cathode, and aeration is carried out at the bottom in a blowing mode.
6. The method of claim 5, wherein: the cathode is a three-dimensional PAN-based porous carbon felt cathode.
7. The utility model provides an electrolysis is handled high chlorine desulfurization waste water and is coupled denitration demercuration system which characterized in that: the system comprises a preposed SCO system, an SCR system, a dust remover, a wet flue gas desulfurization system and a desulfurization waste water flue gas concentration tower which are connected in parallel, wherein the preposed SCO system, the SCR system, the dust remover, the wet flue gas desulfurization system and the desulfurization waste water flue gas concentration tower are sequentially connected through a flue; the bottom of the desulfurization waste water flue gas concentration tower is connected with a flue and is provided with a waste water pipeline, and the top of the desulfurization waste water flue gas concentration tower is connected with a waste water pipe of a wet flue gas desulfurization system and is provided with a return flue for flue gas to flow into the wet flue gas desulfurization system; the wastewater pipeline at the bottom of the desulfurization wastewater flue gas concentration tower is sequentially connected with a pretreatment coagulating sedimentation tank and an electrolysis system, the electrolysis system comprises an anode chamber and a cathode chamber, an anion exchange membrane is arranged between the anode chamber and the cathode chamber, the anode chamber is sequentially connected with a gas-liquid mixing tank and a front SCO system through a pipeline, and the cathode chamber is sequentially connected with a catholyte backflow system and the pretreatment coagulating sedimentation tank through a pipeline.
8. The system for electrolytically treating high-chlorine desulfurization wastewater and coupling denitration and demercuration as claimed in claim 7, wherein: the front SCO system is filled with activated alumina packing or the same catalyst as the industrial SCR process.
9. The system for electrolytically treating high-chlorine desulfurization wastewater and coupling denitration and demercuration as claimed in claim 7, wherein: the anode chamber is provided with a stainless steel stirring device or a rotary ruthenium-titanium mesh electrode, and the cathode adopts a three-dimensional PAN-based porous carbon felt cathode.
10. The system for electrolytically treating high-chlorine desulfurization wastewater and coupling denitration and demercuration as claimed in claim 7, wherein: the bottom of the cathode chamber is provided with a blower.
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