CN207722625U - A kind of inexpensive mercury pollution control system of coal-burning boiler - Google Patents
A kind of inexpensive mercury pollution control system of coal-burning boiler Download PDFInfo
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- CN207722625U CN207722625U CN201721364880.6U CN201721364880U CN207722625U CN 207722625 U CN207722625 U CN 207722625U CN 201721364880 U CN201721364880 U CN 201721364880U CN 207722625 U CN207722625 U CN 207722625U
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- desulfurization wastewater
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Abstract
The utility model discloses a kind of inexpensive mercury pollution control systems of coal-burning boiler, boiler system is added using the desulfurization wastewater of high halogen as pressure oxidant, increase the oxidisability of flue gas, Elemental Mercury in flue gas is forced to be oxidized to bivalent mercury, bivalent mercury is removed by Collaborative Control in deduster and wet desulphurization device, and the mercury emissions of coal-burning boiler are greatly decreased；Desulfurization wastewater is utilized as oxidant in the utility model, eliminate demercuration oxidant expense, reduce the operating cost of mercury pollution control, recycling desulfurization wastewater simultaneously, solve the problems, such as that high halogen waste water is reluctant, the advanced treating expense for saving desulfurization wastewater, realizes the zero-emission of desulfurization wastewater；The utility model has the advantages that equipment is simple, easy to operate and applied widely, can meet the removing of efficient, the inexpensive mercury contaminants of different coal-burning boilers.
Description
Technical field
The utility model belongs to environmental protection technical field, and in particular to a kind of based on wet process of FGD coal-burning boiler
Inexpensive mercury pollution control system.
Background technology
Mercury is a kind of methyl Hg toxicity that can be converted with the virose chemical substance of tool that global range migrates, transition process
It is stronger, there is carcinogenic, teratogenesis, mutagenic effect to human body.The discharge of mercury is divided into artificial source and natural source, in the world most of state
Family is all actively pushing forward artificial source mercury emission reduction plan, wherein five industries such as coal-burning power plant, coal-burned industrial boiler, are international mercury
Pact is directed to the main management and control source of air mercury control.2013, world community was in Japanese official signature《Water about mercury
Yu pacts》, this indicates that whole world mercury pollution prevention has entered a new stage, and China ratified on April 28th, 2016
《Minamata pact about mercury》Will be formally effective to China from August in 2017 16 days, coal-burning boiler mercury emissions problem is obtaining
To more and more concerns.
China sets for environmental protection and sustainable development, the generally all mating desulphurization and denitration of coal-burning boiler and dedusting environment friendly
It applies, the heavy metals such as pollutant sulfur dioxide, nitrogen oxides, flue dust and mercury have stringent emission limit requirement.Thermal power plant's pollutant
Discharge standard (GB 13223-2011) is distinctly claimed 30 μ g/Nm of mercury and mercuric compounds concentration limit3, the U.S. and Germany etc. are flourishing
The standard of country requires stringenter.It is contemplated that the mercury emissions problem of coal-burning boiler is being got growing concern for, mercury
And its compound emission concentration limit probably further decreases.
The smoke-gas wet desulfurization environmental protecting device of coal-burning boiler configuration, the technology low, highly reliable, efficiency with calcium sulfur ratio
The advantages that high, by-product can utilize, when such as making desulfurizing agent using lime stone, when Ca/S=1.05 or so, desulfuration efficiency is reachable
90% or more.Countries in the world are all using smoke-gas wet desulfurization technology as mainstream desulfurization technology, and Japan accounts for 98%, and the U.S. accounts for 92%,
Germany accounts for 90%, and China accounts for 91%, and the whole world averagely accounts for about 85%.Nevertheless, smoke-gas wet desulfurization also has the deficiency of oneself
Place constantly generates a large amount of waste water in flue gas desulfurization course.Desulfurization wastewater can be by most of pollution by waste water processing station
Object removes, but the halogens such as desulfurization wastewater chlorine, bromine for containing are difficult to remove.Content of halogen is high in general wastewater desulfurized by fume wet
Up to 15000mg/L or so, advanced treating somewhat expensive.
The mercury contaminants that coal-fired boiler combustion generates are generally acknowledged that there are three types of form, particulate Hg, bivalent mercury and Elemental Mercury,
Middle particulate Hg and bivalent mercury can be in cleaners and wet desulphurization device by cooperation-removal, and Elemental Mercury is discharged into air.Therefore,
The control removing for reinforcing Elemental Mercury is to reduce the main direction of studying of mercury contaminants.Currently, Elemental Mercury Pollutant Control Technology master
Will there are two types of.One is absorption demercuration technologies：Spray adsorbent in flue gas before cleaner, in absorption the adsorbent of mercury with
Flue dust is trapped by cleaner.Adsorbent generally uses the substances such as expensive activated carbon or modified activated carbon, absorption
The cost of agent is to limit the principal element of this technology development.Another kind is oxidation demercuration technology:In combustion zone or high temperature cigarette
Add the oxidants such as halogen in gas region so that Elemental Mercury is oxidized to bivalent mercury, and bivalent mercury is in cleaner and wet desulphurization
It is removed in device.Halogen generally uses villaumite or bromide, and burner hearth or back-end ductwork are added in the form of solid or liquid.Outside
Halogen oxidant is added to be added significantly to the operating cost of demercuration system, for using the increased cost of boiler demercuration of low chlorine coal more
Very.
Invention content
In order to overcome the disadvantages of the above prior art, the purpose of this utility model is to provide a kind of coal-burning boiler it is low at
This mercury pollution control system, with demercuration efficiency height, recycling desulfurization wastewater, at low cost, applied widely, equipment is simple
The characteristics of.
The utility model solves above-mentioned technical problem and is mainly resolved by following technical proposals：A kind of coal-burning boiler
Inexpensive mercury pollution control system, the desulfurization wastewater treating stations 7 for being included in the Wet FGD 5 of coal-burning boiler 1 export
The oxidant adding set 8 added, the combustion zone transport system 10 being connect with oxidant adding set 8 and high-temperature flue gas region
Transport system 9, the combustion zone transport system 10 connect the as-fired coal system and combustion-aid air system of coal-burning boiler 1, institute
The high-temperature flue gas region transport system 9 stated connect coal-burning boiler 1 economizer is front and back or back-end ductwork high-temperature area, it is described
Combustion zone transport system 10 and high-temperature flue gas region transport system 9 can be by the high halogen oxidants of oxidant adding set 8
It inputs in the flue gas of coal-burning boiler 1, the Elemental Mercury pressure in flue gas is oxidized to bivalent mercury, part bivalent mercury is converted into particulate Hg
It is captured in deduster 4, other bivalent mercuries are removed in Wet FGD 5.
The oxidant adding set 8 connects the water outlet of desulfurization wastewater treating stations 7, stores oxidant desulfurization wastewater.
It puts into operation when desulfurization wastewater content of halogen is low, it is described for the halogen concentration for ensureing in oxidant adding set 8
Oxidant adding set 8 is equipped with oxidant applying system, when the content of halogen that desulfurization wastewater treating stations 7 are discharged is enough, then not
If oxidant applying system.
The combustion zone transport system 10 is equipped with metering device, by as-fired coal or combustion air, by halogen oxidant
In proportion input coal-burning boiler 1 burner hearth, improve coal-burning boiler 1 in flue gas oxidisability, by elemental mercury oxidation be bivalent mercury, two
Valence mercury is in deduster 4 and Wet FGD 5 by cooperation-removal.
High-temperature flue gas region transport system 9 is equipped with metering device, and halogen oxidant is inputted to coal-burning boiler 1 in proportion
Economizer is front and back or back-end ductwork high-temperature area, improve the oxidisability of 1 flue gas of coal-burning boiler, be divalent by elemental mercury oxidation
Mercury, bivalent mercury is in deduster 4 and Wet FGD 5 by cooperation-removal.
The combustion zone transport system 10 is remote by 1 centralized control system of coal-burning boiler with high-temperature flue gas region transport system 9
Process control has craft and automatically controls both of which, is capable of the addition of stability contorting halogen oxidant.
A kind of control method of the inexpensive mercury pollution control system of coal-burning boiler, the burning of coal-burning boiler 1 generate
Flue gas in contain Elemental Mercury, conveyed by combustion zone as oxidant using high halogen waste water in oxidant adding set 8
System 10 or high-temperature flue gas region transport system 9 input coal-burning boiler 1, the oxidisability of flue gas are improved, by the simple substance in flue gas
Mercury pressure is oxidized to bivalent mercury, and bivalent mercury, by cooperation-removal, overcomes Elemental Mercury in deduster 4 and Wet FGD 5
The problem of being difficult to by 1 environmental protection equipment Collaborative Control of coal-burning boiler, the chimney 6 for reducing coal-burning boiler 1 are discharged into the mercury quantity of air, reduce
Coal-burning boiler mercury pollution.
Compared to the prior art compared with the utility model has the following advantages that：
1. using desulfurization wastewater as oxidant, oxidizing simple substance mercury is forced, demercuration oxidant expense is substantially saved, reduced
The operating cost of mercury pollution control.2. using desulfurization wastewater as oxidant, recycling desulfurization wastewater solves high halogen
The reluctant problem of waste water.3. desulfurization wastewater amount is greatly decreased as oxidant in desulfurization wastewater, the depth of desulfurization wastewater is saved
Processing cost is spent, the zero-emission of desulfurization wastewater is realized.4. using boiler system itself waste water as oxidant, force oxidation single
The principle of matter mercury has the advantages that equipment is simple, easy to operate.5. desulfurization wastewater, which is used as coal yard, sprays water in dust removal, make high halogen
Element is uniformly added into coal, has the advantages that save water resource.
Description of the drawings
Fig. 1 is the schematic diagram of Tthe utility model system.
In figure：
1-- coal-burning boiler 2-- economizer 3-- air preheaters
4-- deduster 5-- Wet FGD 6-- chimneys
7-- desulfurization wastewater treating stations 8-- oxidant adding sets
The 9-- high-temperature flue gas region combustion zones transport system 10-- transport system
Specific implementation mode
The utility model is described in detail in the following with reference to the drawings and specific embodiments
Embodiment one：
As shown in Figure 1, the present embodiment goes out in the desulfurization wastewater treating stations 7 of the Wet FGD 5 of coal-burning boiler 1
Mouthful, it is additionally arranged oxidant adding set 8, Elemental Mercury mistake during 1 as-fired coal content of halogen of coal-burning boiler is too low or 6 discharged gas fume of chimney
Gao Shi, combustion zone transport system 10 start, high halogen desulfurization wastewater in oxidant adding set 8 by as-fired coal or help
The burner hearth of air input coal-burning boiler 1 is fired, Elemental Mercury pressure in flue gas is oxidized to bivalent mercury, a part of bivalent mercury conversion by halogen
It is captured down in deduster 4 for particulate Hg, other bivalent mercuries obtain cooperation-removal in wet desulphurization device 5, reduce fire coal
The mercury emissions of boiler 1.
Embodiment two：
As shown in Figure 1, the present embodiment goes out in the desulfurization wastewater treating stations 7 of the Wet FGD 5 of coal-burning boiler 1
Mouthful, it is additionally arranged oxidant adding set 8, Elemental Mercury mistake during 1 as-fired coal content of halogen of coal-burning boiler is too low or 6 discharged gas fume of chimney
Gao Shi, high-temperature flue gas region transport system 9 start, and by high halogen desulfurization wastewater in oxidant adding set 8, input economizer 2
Elemental Mercury pressure in flue gas is oxidized to bivalent mercury by front and back or other back-end ductwork high-temperature areas, halogen, and bivalent mercury is in deduster 4
Cooperation-removal is obtained with wet desulphurization device 5, reduces the mercury emissions of coal-burning boiler 1.
Embodiment three：
As shown in Figure 1, the present embodiment goes out in the desulfurization wastewater treating stations 7 of the Wet FGD 5 of coal-burning boiler 1
Mouthful, it is additionally arranged oxidant adding set 8, when desulfurization wastewater content of halogen is too low, oxidant adding set 8 is equipped with additional oxidation
Agent system starts, and ensures the content of halogen in oxidant adding set 8, starts combustion zone transport system 10 or high-temperature flue gas area
High halogen solutions in oxidant adding set 8 are inputted 1 system of coal-burning boiler by domain transport system 9, and the halogen into flue gas will be single
Matter mercury oxidation is bivalent mercury, and bivalent mercury obtains cooperation-removal in deduster 4 and wet desulphurization device 5, reduces coal-burning boiler 1
Mercury emissions.
Specific embodiment described herein is only to be illustrated to the spirit of the present invention.The utility model institute
Belong to those skilled in the art, can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Although more herein used oxidant adding set 8, high-temperature flue gas region transport system 9, combustion zone defeated
The terms such as system 10 are sent, but the possibility using other terms is not precluded.The use of these items is only for easily retouch
The essence for stating and explaining the utility model, being construed as any one of the additional limitations all is and the spirit of the present invention phase
It violates.
The above only further illustrates the content of the utility model with embodiment, in order to be easier to understand, but not
The embodiment for representing the utility model is only limitted to this, and any technology for being done according to the utility model extends or recreation, by
The protection of the utility model.
Claims (5)
1. a kind of inexpensive mercury pollution control system of coal-burning boiler, it is characterised in that：The flue gas for being included in coal-burning boiler (1) is wet
The desulfurization wastewater treating stations (7) of method desulfurizer (5) export the oxidant adding set (8) added, with oxidant adding set
(8) the combustion zone transport system (10) and high-temperature flue gas region transport system (9) connected, the combustion zone transport system
(10) the as-fired coal system and combustion-aid air system of connection coal-burning boiler (1), the high-temperature flue gas region transport system (9) is even
Connect coal-burning boiler (1) economizer is front and back or back-end ductwork high-temperature area.
2. a kind of inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The oxygen
Agent adding set (8) connects the water outlet of desulfurization wastewater treating stations (7), stores oxidant desulfurization wastewater.
3. a kind of inexpensive mercury pollution control system of coal-burning boiler according to claim 2, it is characterised in that：The oxygen
Agent adding set (8) is equipped with oxidant applying system or does not set oxidant applying system.
4. a kind of inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The combustion
It burns region transport system (10) and is equipped with metering device.
5. a kind of inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The height
Warm smoke-gas area transport system (9) is equipped with metering device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721364880.6U CN207722625U (en) | 2017-10-23 | 2017-10-23 | A kind of inexpensive mercury pollution control system of coal-burning boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721364880.6U CN207722625U (en) | 2017-10-23 | 2017-10-23 | A kind of inexpensive mercury pollution control system of coal-burning boiler |
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| Publication Number | Publication Date |
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| CN207722625U true CN207722625U (en) | 2018-08-14 |
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ID=63090880
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| CN201721364880.6U Active CN207722625U (en) | 2017-10-23 | 2017-10-23 | A kind of inexpensive mercury pollution control system of coal-burning boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109865415A (en) * | 2019-04-08 | 2019-06-11 | 福建省特种设备检验研究院 | CFB boiler, which is mixed, burns anthracite and sawdust sludge gas mercury oxidation control technique |
-
2017
- 2017-10-23 CN CN201721364880.6U patent/CN207722625U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109865415A (en) * | 2019-04-08 | 2019-06-11 | 福建省特种设备检验研究院 | CFB boiler, which is mixed, burns anthracite and sawdust sludge gas mercury oxidation control technique |
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