CN107583445A - Inexpensive the mercury pollution control system and method for a kind of coal-burning boiler - Google Patents
Inexpensive the mercury pollution control system and method for a kind of coal-burning boiler Download PDFInfo
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- CN107583445A CN107583445A CN201710991554.6A CN201710991554A CN107583445A CN 107583445 A CN107583445 A CN 107583445A CN 201710991554 A CN201710991554 A CN 201710991554A CN 107583445 A CN107583445 A CN 107583445A
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Abstract
The invention discloses inexpensive the mercury pollution control system and method for a kind of coal-burning boiler, steam generator 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；Present invention utilizes desulfurization wastewater as oxidant, eliminate demercuration oxidant expense, reduce the operating cost of mercury pollution control, recycling desulfurization wastewater simultaneously, solves the high reluctant problem of halogen waste water, the advanced treating expense of desulfurization wastewater is saved, realizes the zero-emission of desulfurization wastewater；The present invention has the advantages of 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 invention belongs to environmental protection technical field, and in particular to it is a kind of based on wet process of FGD coal-burning boiler it is low into
This mercury pollution control system and method.
Background technology
Mercury is a kind of methyl Hg toxicity that can be converted with the virose chemical substance of tool of global range migration, 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 on mercury
Yu pacts》, this indicates that whole world mercury pollution preventing and treating has entered a new stage, and China ratified on April 28th, 2016
《Minamata pact on mercury》Will be formally effective to China from August in 2017 16 days, coal-burning boiler mercury emissions problem is
To increasing concern.
China sets for environmental protection and sustainable development, the typically all supporting desulphurization and denitration of coal-burning boiler and dedusting environment friendly
Apply, the heavy metal such as pollutant sulfur dioxide, nitrogen oxides, flue dust and mercury has strict emission limit requirement.Thermal power plant's pollutant
Discharge standard (GB 13223-2011) is distinctly claimed the μ g/Nm of mercury and mercuric compounds concentration limit 303, the prosperity such as the U.S. and Germany
The standard of country requires stricter.It is contemplated that the mercury emissions problem of coal-burning boiler is got growing concern for, mercury
And its compound emission concentration limit probably further reduces.
The smoke-gas wet desulfurization environmental protecting device of coal-burning boiler configuration, the technology have that calcium sulfur ratio is low, highly reliable, efficiency
The advantages that high, accessory substance can utilize, when such as making desulfurizing agent using lime stone, during Ca/S=1.05 or so, desulfuration efficiency is reachable
More than 90%.Countries in the world all account for 98% using smoke-gas wet desulfurization technology as main flow desulfurization technology, Japan, and the U.S. accounts for 92%,
Germany accounts for 90%, and China accounts for 91%, and the whole world averagely accounts for 85%.Nevertheless, smoke-gas wet desulfurization also has the deficiency of oneself
Part, substantial amounts of waste water is constantly produced in flue gas desulfurization course.Desulfurization wastewater can be by most of pollution by waste water processing station
Thing removes, but chlorine, the halogen such as bromine that desulfurization wastewater contains 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.
Mercury contaminants caused by coal-fired boiler combustion have been generally acknowledged that three kinds of forms, particulate Hg, bivalent mercury and Elemental Mercury, its
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 strengthening Elemental Mercury is to reduce the main direction of studying of mercury contaminants.At present, Elemental Mercury Pollutant Control Technology master
There are two kinds.One kind is absorption demercuration technology：Spray adsorbent in flue gas before cleaner, in absorption the adsorbent of mercury with
Flue dust is trapped by cleaner.Adsorbent is typically using the materials 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
The oxidants such as gas region addition halogen so that Elemental Mercury is oxidized to bivalent mercury, and bivalent mercury is in cleaner and wet desulphurization
Removed in device.Halogen typically 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.
The content of the invention
The shortcomings that in order to overcome above-mentioned prior art, it is an object of the invention to provide a kind of inexpensive mercury of coal-burning boiler
Pollution control system and method, there is demercuration efficiency height, recycling desulfurization wastewater, cost is low, applied widely, equipment is simple
The characteristics of single.
The present invention solves above-mentioned technical problem and is mainly resolved by following technical proposals：
A kind of inexpensive mercury pollution control system of coal-burning boiler, it is included in the Wet FGD 5 of coal-burning boiler 1
Desulfurization wastewater treating stations 7 export the oxidant adding set 8 set up, the combustion zone being connected with oxidant adding set 8 is defeated
System 10 and high-temperature flue gas region induction system 9 are sent, described combustion zone induction system 10 connects the as-fired coal of coal-burning boiler 1
System and combustion-aid air system, the economizer of described high-temperature flue gas region induction system 9 connection coal-burning boiler 1 is front and rear or afterbody
Flue high-temperature area, described combustion zone induction system 10 and high-temperature flue gas region induction system 9 can add oxidant
In the flue gas of the high halogen oxidant input coal-burning boiler 1 of device 8, the Elemental Mercury in flue gas is forced to be oxidized to bivalent mercury, portion
Point bivalent mercury is converted into particulate Hg and is captured in deduster 4, and 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.
Put into operation when desulfurization wastewater content of halogen is low, it is described to ensure the halogen concentration in oxidant adding set 8
Oxidant adding set 8 is provided with oxidant applying system,；When the content of halogen of the water outlet of desulfurization wastewater treating stations 7 is enough, then not
If oxidant applying system.
The combustion zone induction system 10 is provided with metering device, by as-fired coal or combustion air, by halogen oxidant
The burner hearth of coal-burning boiler 1 is inputted in proportion, is improved the oxidisability of flue gas in coal-burning boiler 1, is bivalent mercury by elemental mercury oxidation, two
Valency mercury is in deduster 4 and Wet FGD 5 by cooperation-removal.
High-temperature flue gas region induction system 9 is provided with metering device, and halogen oxidant is inputted to coal-burning boiler 1 in proportion
Economizer is front and rear or back-end ductwork high-temperature area, improve the oxidisability of the flue gas of coal-burning boiler 1, be divalence by elemental mercury oxidation
Mercury, bivalent mercury is in deduster 4 and Wet FGD 5 by cooperation-removal.
The combustion zone induction system 10 and high-temperature flue gas region induction system 9 are remote by the centralized control system of coal-burning boiler 1
Process control, there is craft and automatically control both of which, be capable of the addition of stability contorting halogen oxidant.
A kind of control method of the inexpensive mercury pollution control system of described coal-burning boiler, the burning of coal-burning boiler 1 produce
Flue gas in contain Elemental Mercury, high halogen waste water is conveyed as oxidant by combustion zone by the use of in oxidant adding set 8
System 10 or high-temperature flue gas region induction system 9 input coal-burning boiler 1, the oxidisability of flue gas are improved, by the simple substance in flue gas
Mercury is forced to be 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, reduced
Coal-burning boiler mercury pollution.
Compared to the prior art compared with, the invention has the advantages that：
1. by the use of desulfurization wastewater as oxidant, oxidizing simple substance mercury is forced, significantly saves demercuration oxidant expense, is reduced
The operating cost of mercury pollution control.2. by the use of desulfurization wastewater as oxidant, recycling desulfurization wastewater, solves high halogen
The reluctant problem of waste water.3. desulfurization wastewater is greatly decreased desulfurization wastewater amount, saves the depth of desulfurization wastewater as oxidant
Processing cost is spent, realizes the zero-emission of desulfurization wastewater.4. by the use of steam generator system itself waste water as oxidant, force oxidation single
The principle of matter mercury, there is the advantages of equipment is simple, easy to operate.5. desulfurization wastewater is used as into coal yard sprinkling water in dust removal, make high halogen
Element is uniformly added into coal, has the advantages of saving water resource.
Brief description of the drawings
Fig. 1 is the schematic diagram of present 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
9-- high-temperature flue gas region induction system 10-- combustion zones induction system
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings
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, be additionally arranged oxidant adding set 8, the as-fired coal content of halogen of coal-burning boiler 1 is too low or the discharged gas fume of chimney 6 in Elemental Mercury mistake
Gao Shi, combustion zone induction system 10 start, and high halogen desulfurization wastewater in oxidant adding set 8 by as-fired coal or helps
The burner hearth of air input coal-burning boiler 1 is fired, halogen forces Elemental Mercury in flue gas to be oxidized to bivalent mercury, a part of bivalent mercury conversion
It is captured down for particulate Hg in deduster 4, 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, be additionally arranged oxidant adding set 8, the as-fired coal content of halogen of coal-burning boiler 1 is too low or the discharged gas fume of chimney 6 in Elemental Mercury mistake
Gao Shi, high-temperature flue gas region induction system 9 start, and by high halogen desulfurization wastewater in oxidant adding set 8, input economizer 2
Front and rear or other back-end ductwork high-temperature areas, halogen force Elemental Mercury in flue gas to be oxidized to bivalent mercury, 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, oxidant adding set 8 is additionally arranged, when desulfurization wastewater content of halogen is too low, oxidant adding set 8 is provided with additional oxidation
Agent system starts, and ensures the content of halogen in oxidant adding set 8, starts combustion zone induction system 10 or high-temperature flue gas area
Domain induction system 9, high halogen solutions in oxidant adding set 8 are inputted into the system of coal-burning boiler 1, 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 that spirit of the present invention is illustrated.Technology belonging to the present invention is led
The technical staff in domain, various modifications or supplement can be made to described specific embodiment or is replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although more herein used oxidant adding set 8, high-temperature flue gas region induction system 9, combustion zone defeated
The grade term of system 10 is sent, but is not precluded from the possibility using other terms.It is used for the purpose of easily retouching using these terms
The essence of the present invention is stated and explained, any additional limitation is construed as and is all disagreed with spirit of the present invention.
It is described above that present disclosure is only further illustrated with embodiment, in order to be easier to understand, but do not represent
Embodiments of the present invention are only limitted to this, and any technology done according to the present invention extends or recreation, is protected by the present invention.
Claims (7)
- A kind of 1. 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 oxidant adding set (8) that desulfurization wastewater treating stations (7) outlet of method desulfurizer (5) is set up, with oxidant adding set (8) the combustion zone induction system (10) and high-temperature flue gas region induction system (9) of connection, described combustion zone induction system (10) the as-fired coal system and combustion-aid air system of coal-burning boiler (1) are connected, described high-temperature flue gas region induction system (9) is even Connect coal-burning boiler (1) economizer is front and rear or back-end ductwork high-temperature area, described combustion zone induction system (10) and high temperature Smoke-gas area induction system (9) can input the high halogen oxidant of oxidant adding set (8) flue gas of coal-burning boiler (1) In, the Elemental Mercury in flue gas is forced to be oxidized to bivalent mercury, part bivalent mercury is converted into particulate Hg and is caught in deduster (4) Collection, other bivalent mercuries are removed in Wet FGD (5).
- A kind of 2. inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The oxygen The water outlet of agent adding set (8) connection desulfurization wastewater treating stations (7), store oxidant desulfurization wastewater.
- A kind of 3. inexpensive mercury pollution control system of coal-burning boiler according to claim 2, it is characterised in that：Work as desulfurization Waste water content of halogen puts into operation when low, to ensure the halogen concentration in oxidant adding set (8), the oxidant addition dress Put (8) and be provided with oxidant applying system, when the content of halogen of desulfurization wastewater treating stations (7) water outlet is enough, then do not set outer oxygenation Agent system.
- A kind of 4. inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The combustion Burn region induction system (10) and be provided with metering device, by as-fired coal or combustion air, halogen oxidant is inputted to combustion in proportion The burner hearth of coal burning boiler (1), improve the oxidisability of flue gas in coal-burning boiler (1), be bivalent mercury by elemental mercury oxidation, bivalent mercury except Dirt device (4) and Wet FGD (5) are by cooperation-removal.
- A kind of 5. inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The height Warm smoke-gas area induction system (9) is provided with metering device, before halogen oxidant is inputted into the economizer of coal-burning boiler (1) in proportion Afterwards or back-end ductwork high-temperature area, the oxidisability of coal-burning boiler (1) flue gas is improved, is bivalent mercury by elemental mercury oxidation, bivalent mercury In deduster (4) and Wet FGD (5) by cooperation-removal.
- A kind of 6. inexpensive mercury pollution control system of coal-burning boiler according to claim 1, it is characterised in that：The combustion Burn region induction system (10) and high-temperature flue gas region induction system (9) and pass through coal-burning boiler (1) centralized control system remote control, tool There is craft and automatically control both of which, be capable of the addition of stability contorting halogen oxidant.
- 7. a kind of control method of the inexpensive mercury pollution control system of coal-burning boiler described in any one of claim 1 to 6, its It is characterised by：Contain Elemental Mercury in flue gas caused by coal-burning boiler (1) burning, utilize high halogen in oxidant adding set (8) Waste water inputs coal-burning boiler as oxidant by combustion zone induction system (10) or high-temperature flue gas region induction system (9) (1) oxidisability of flue gas, is improved, the Elemental Mercury in flue gas is forced to be oxidized to bivalent mercury, bivalent mercury is in deduster (4) and cigarette Gas wet desulphurization device (5) is overcome Elemental Mercury and is difficult to asking by coal-burning boiler (1) environmental protection equipment Collaborative Control by cooperation-removal Topic, the chimney (6) for reducing coal-burning boiler (1) are discharged into the mercury quantity of air, reduce coal-burning boiler mercury pollution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710991554.6A CN107583445A (en) | 2017-10-23 | 2017-10-23 | Inexpensive the mercury pollution control system and method for a kind of coal-burning boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710991554.6A CN107583445A (en) | 2017-10-23 | 2017-10-23 | Inexpensive the mercury pollution control system and method for a kind of coal-burning boiler |
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| CN107583445A true CN107583445A (en) | 2018-01-16 |
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| CN201710991554.6A Pending CN107583445A (en) | 2017-10-23 | 2017-10-23 | Inexpensive the mercury pollution control system and method for a kind of coal-burning boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701621A (en) * | 2019-09-29 | 2020-01-17 | 上海交通大学 | Conditioning agent for waste incineration and method for controlling emission reduction of flue gas mercury and nitrogen oxide by conditioning agent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202224052U (en) * | 2011-09-19 | 2012-05-23 | 华电环保系统工程有限公司 | Device for removing mercury in coal-fired power plant with wet flue gas desulfurization wastewater |
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2017
- 2017-10-23 CN CN201710991554.6A patent/CN107583445A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202224052U (en) * | 2011-09-19 | 2012-05-23 | 华电环保系统工程有限公司 | Device for removing mercury in coal-fired power plant with wet flue gas desulfurization wastewater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701621A (en) * | 2019-09-29 | 2020-01-17 | 上海交通大学 | Conditioning agent for waste incineration and method for controlling emission reduction of flue gas mercury and nitrogen oxide by conditioning agent |
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