CN207786292U - A kind of sulfur trioxide and mercury removal system based on magnesium processes desulfurization - Google Patents
A kind of sulfur trioxide and mercury removal system based on magnesium processes desulfurization Download PDFInfo
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- CN207786292U CN207786292U CN201720816393.2U CN201720816393U CN207786292U CN 207786292 U CN207786292 U CN 207786292U CN 201720816393 U CN201720816393 U CN 201720816393U CN 207786292 U CN207786292 U CN 207786292U
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- magnesium
- flue
- mercury
- sulfur trioxide
- waste water
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Abstract
A kind of sulfur trioxide and mercury removal system based on magnesium processes desulfurization, the system comprises sequentially connected oxidation pond, curing tank, storage tank, metering distribution and spraying systems.The waste water that magnesium processes desulfurization is discharged first passes through waste water pretreatment system, magnesium sulfite and magnesium bisulfite in further oxidized waste water；Will it is magnesium oxide slaking made of magnesium hydroxide be used as absorbent, by metering distribute and spraying system between SCR reactors and air preheater flue and air preheater and electric precipitation between flue in sprayed.The utility model can not only be effectively reduced the content of sulfur trioxide in flue gas by two-stage injection, reduce the influence to equipment such as air preheaters, it can also convert the element mercury in flue gas to oxidation state mercury or particle mercury using the hydrogen chloride that the magnesium chloride in waste water is converted to and be trapped by electric precipitator, realize the joint removing of sulfur trioxide and mercury.
Description
Technical field
The utility model is related to coal-fired flue-gas processing technology field more particularly to a kind of sulfur trioxides based on magnesium processes desulfurization
With the removing system of mercury.
Background technology
The SO that coal will produce in combustion3With the substances such as Hg to electric power factory equipment, atmospheric environment and the body of the mankind
Health produces undesirable influence, and the chlorine ion concentration in the waste water that magnesium processes desulfurization generates is very high, can be generated to equipment and pipeline
Corrosion.
SO in flue gas3It can be reacted with vapor and generate sulfuric acid vapor, once pipe temperature is too low, sulfuric acid mist will corrode
Pipeline；SO3The ammonium hydrogen sulfate (ABS) generated with escape ammonia reaction is a kind of sticking substance, can be adhered to air preheater
With the surface of wind turbine, the corrosion to equipment is caused；Due to SO3It is easy to form aerosol, it is difficult to be removed, be easy in FGD towers
The pinniform flue gas of blue is formed, also known as " blue plumage phenomenon ".Mg(OH)2It can be with the SO in flue gas3Reaction generates magnesium sulfate, also may be used
It is still solid ammonium magnesium sulfate (AMS) when generating 1292 DEG C, magnesium sulfate and ammonium magnesium sulfate are last directly to be reacted with ammonium hydrogen sulfate
It can be removed by electric precipitation.
Mercury greatly and is the lasting noxious material of environmental pollution to human health damage.Generally there are three for mercury in flue gas
Kind form：Element mercury Hg0, oxidation state mercury Hg2+, particulate form Hgp。Hg0Volatility it is very strong, be not readily dissolved in water, the pole in flue gas
Difficulty is removed, Hg2+And HgpIt is easy to be removed in electric precipitation and FGD, therefore, by Hg0It is converted into the mercury of other forms, can be had
Effect effectively improves the removal rate of Hg.MgCl2It can be decomposed at 150 DEG C and generate HCl or Active Chlorine, element mercury can be converted to
Oxidation state mercury or particle mercury, and ash content can be improved in flue gas to the adsorptivity of mercury.
The patent No. 201210045064.4 discloses a kind of flue gas mercury removal system based on discharge activation halogen family substance, by halogen
Race's substance is injected into activation device, and activated halogen family substance can convert elemental mercury to oxidation state mercury and particulate form
Mercury, but device energy-wasting is larger in patent, economy is to be improved.
The patent No. 201610624013.5 discloses a kind of removing mercury in flue gas and sulfur trioxide based on electrostatic fabric filter
Control method and device describe in patent and spray solution in electrostatic fabric filter entrance, to remove SO3And Hg, and power plant sets
During received shipment row, ammonium hydrogen sulfate (ABS) is very big to the harm of air preheater, and patented method can not avoid ABS pre- to air
The corrosion of hot device.
Sulfur trioxide in flue gas can not only be realized using the magnesium chloride in magnesium hydroxide slurry and magnesium processes desulfurization wastewater
Removing, while also can improve capture rate of the electric precipitation to mercury by the elemental mercury in flue gas at oxidation state mercury.
Utility model content
To solve the above-mentioned problems, according to Mg (OH)2With SO3Reaction mechanism and magnesium processes desulfurization wastewater in MgCl2In cigarette
Decomposition product in road to the oxidation mechanism of element mercury, the utility model proposes a kind of sulfur trioxide based on magnesium processes desulfurization and
The removing system of mercury is applied in the smoke gas treatment system of coal-burning power plant；The removing system includes sequentially connected oxidation
Pond, curing tank, storage tank, metering distribution and injection apparatus, wherein
The oxidation pond is used for the pretreatment of magnesium processes desulfurization wastewater, by being aerated the magnesium sulfite in magnesium processes desulfurization wastewater
It is aoxidized with magnesium bisulfite；
Magnesium hydroxide slurry is made for curing magnesia in the curing tank；
The storage tank is for storing the magnesium hydroxide slurry；
The metering distribution and spraying system, for being sprayed into flue through spray gun after diluting magnesium hydroxide slurry.
Further, further include being set to oxidation pond and the filter on the connecting line of curing tank and clean water tank, the mistake
Filter is used to filter the desulfurization wastewater that the oxidation pond comes out, and clarification is obtained by filtration for storing the filter in the clean water tank
Desulfurization wastewater.
Further, the flue refers to flue between SCR reactors and air preheater and air preheater and electricity
Flue between dedusting.
Further, installation form of the spray gun in flue is along flue gas stream installation.
Further, the spray gun uses air atomizer spray nozzle, and the atomizing particle size of nozzle is 20-100 μm, atomizing angle 30-
60°。
A kind of removing system of sulfur trioxide and mercury based on magnesium processes desulfurization of the utility model has the advantage that：
1, magnesium processes desulfurization wastewater recycling may be implemented, keep desulfurization useless the effect of element mercury using the chlorine in desulfurization wastewater
Water being capable of recycling.
2, the flue between SCR exhaust pass and air preheater and electric precipitation carries out two-stage injection, on the one hand can
More thoroughly removal SO3, reduce SO3Damage to air preheater and follow-up equipment, another aspect waste water are sprayed in level-one
After atomization and vaporization, by MgCl in waste water2The HCl of generation converts element mercury to oxidation state mercury or particle mercury, is more easy to electric precipitation
Device traps.
Description of the drawings
Fig. 1 is the process flow chart of the utility model
Fig. 2 is the eject position schematic diagram of the utility model
In figure, 1- oxidation fans, 2- oxidation ponds, 3- oxidation ponds pump, 4- filters, 5- clean water tanks, 6- clarified water pumps, 7- curings
Tank, 8- curing pumps, 9- storage tanks, 10- solution transfer pumps, 11- mixers, 12- meterings distribution and spraying system, 13- flues, 14-
SCR reactors, 15- level-ones injection flue, 16- air preheaters, 17- two-stage injection flues, 18- electric precipitators, 19 (1)/
(2)-spray gun.
Specific implementation mode
The tool of the removal methods of a kind of to the utility model sulfur trioxide and mercury based on magnesium processes desulfurization below in conjunction with the accompanying drawings
Body embodiment is described in detail, which is merely to illustrate the utility model rather than limits the model of the utility model
It encloses, those skilled in the art fall within the application appended claims to the modification of the various equivalent forms of the utility model and limited
Fixed range.
As shown in Figure 1, a kind of removing system of sulfur trioxide and mercury based on magnesium processes desulfurization.The system its be applied to fire coal
In the smoke gas treatment system of power plant, including sequentially connected oxidation pond, curing tank, storage tank, metering distribution and injection apparatus, also wrap
Filter and the clean water tank being set on the connecting line of oxidation pond and curing tank are included, the filter is for filtering the oxidation
Clear desulfurization wastewater is obtained by filtration for storing the filter in the desulfurization wastewater that pond comes out, the clean water tank.
The oxidation pond is used for the pretreatment of magnesium processes desulfurization wastewater, by being aerated the magnesium sulfite in magnesium processes desulfurization wastewater
It is further aoxidized with magnesium bisulfite；Magnesium hydroxide slurry is made for curing magnesia in the curing tank；The storage tank is used for
Store the magnesium hydroxide slurry.
The metering distribution and spraying system, for spraying into flue through spray gun after measuring and diluting magnesium hydroxide slurry
In, and spray gun dilutes magnesium hydroxide slurry when spraying into flue, is atomized using compressed air.The flue refers to
The flue between flue and air preheater and electric precipitation between SCR reactors and air preheater.The spray gun is in cigarette
Installation form in road is along flue gas stream installation.The spray gun uses air atomizer spray nozzle, and the atomizing particle size of nozzle is 20-100 μ
M, atomizing angle are 30-60 °.
The technological process of sulfur trioxide and mercury removal based on magnesium processes desulfurization in the present embodiment is as follows：
Wastewater Pretreatment, magnesium processes desulfurization wastewater pass through waste water pretreatment system, by passing through aeration oxygen in oxidation pond 2
Change, by magnesium processes desulfurization wastewater magnesium sulfite and magnesium bisulfite further aoxidize, be made oxidation desulfurization wastewater；
The desulfurization wastewater for the oxidation that the oxidation pond 2 comes out, clear desulfurization wastewater is obtained by filtration through filter 4.In order to
The solid impurity in water is filtered out, 4 optional pocket type of filter.
Magnesium hydroxide slurry is made by magnesium oxide slaking in curing tank 7, the concentration after slurry dilution is 10-25%.It is logical
Cross metering distribution and spraying system 12 between SCR reactors and air preheater flue and air preheater and electric precipitation it
Between flue in sprayed.Installation form of the spray gun in flue is along flue gas stream installation；Spray gun uses exterior mixing air mist
Change nozzle, the solid formed according to nebulisation time and atomization is of different sizes, and the atomizing particle size of nozzle is 20-100 μm.According to spraying
Area coverage requirement, the atomizing angle of atomizer is 30-60 °.
As shown in Fig. 2, the flue between the two-stage flue, i.e. SCR reactors 14 and air preheater 16 is as one
Grade injection flue 15, spray gun 19 (1) sprays in flue 15 to level-one and sprays absorbent solution, i.e. magnesium hydroxide slurry, in flue
It is atomization, remove most SO3, the MgCl in waste water2The hydrogen chloride or Active Chlorine being decomposed to form are by elemental mercury at oxidation
State mercury.Two-stage injection flue 17 is arranged between air preheater 16 and electric precipitator 18, suction of the spray gun 19 (2) to two-stage injection
Agent solution, i.e. magnesium hydroxide slurry are received, SO remaining in flue gas is removed3, the MgCl in waste water2It can decompose on a small quantity and generate hydrogen chloride
Continue oxidizing elemental mercury, reduced in this stage flue-gas temperature, ash content improves the adsorption capacity of mercury, is more advantageous to electric precipitation to mercury
Trapping.
The utility model can not only be effectively reduced SO in flue gas by two-stage injection3Content, reduce to air preheat
The influence of the equipment such as device, moreover it is possible to by the Cl in waste water converts the element mercury in flue gas to oxidation state mercury or particle mercury by
Electric precipitator traps, and realizes SO3It is removed with the joint of Hg.
Preferred embodiments of the present invention, still, the utility model and unlimited are described in detail above in association with attached drawing
Detail in the above embodiment can be to the skill of the utility model in the range of the technology design of the utility model
Art scheme carries out a variety of simple variants, these simple variants belong to the scope of protection of the utility model.
Claims (4)
1. a kind of sulfur trioxide and mercury removal system based on magnesium processes desulfurization are applied in the smoke gas treatment system of coal-burning power plant；
It is characterized in that, the removing system includes sequentially connected oxidation pond, curing tank, storage tank, metering distribution and spraying system,
Filter and clean water tank are provided on oxidation pond and the connecting line of curing tank, metering distribution is used for spraying system by hydroxide
It is sprayed into flue through spray gun after magnesium slurry dilution.
2. removing system according to claim 1, which is characterized in that the flue refers to SCR reactors and air preheat
The flue between flue and air preheater and electric precipitation between device.
3. removing system according to claim 1, which is characterized in that installation form of the spray gun in flue is along cigarette
Air-flow is installed.
4. removing system according to claim 1, which is characterized in that the spray gun uses air atomizer spray nozzle, nozzle
Atomizing particle size is 20-100 μm, and atomizing angle is 30-60 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720816393.2U CN207786292U (en) | 2017-07-07 | 2017-07-07 | A kind of sulfur trioxide and mercury removal system based on magnesium processes desulfurization |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720816393.2U CN207786292U (en) | 2017-07-07 | 2017-07-07 | A kind of sulfur trioxide and mercury removal system based on magnesium processes desulfurization |
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| CN207786292U true CN207786292U (en) | 2018-08-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107344061A (en) * | 2017-07-07 | 2017-11-14 | 北京清新环境技术股份有限公司 | A kind of sulfur trioxide and mercury removal system and its removal methods based on magnesium processes desulfurization |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107344061A (en) * | 2017-07-07 | 2017-11-14 | 北京清新环境技术股份有限公司 | A kind of sulfur trioxide and mercury removal system and its removal methods based on magnesium processes desulfurization |
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