CN209271192U - A kind of combined desulfurization and denitration mercury removal device based on calcium method - Google Patents
A kind of combined desulfurization and denitration mercury removal device based on calcium method Download PDFInfo
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- CN209271192U CN209271192U CN201821834874.7U CN201821834874U CN209271192U CN 209271192 U CN209271192 U CN 209271192U CN 201821834874 U CN201821834874 U CN 201821834874U CN 209271192 U CN209271192 U CN 209271192U
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Abstract
The utility model discloses a kind of combined desulfurization and denitration mercury removal devices based on calcium method, the device includes dioxygen water storage tank, hydrogen peroxide outlet connects dioxygen water stream injection pump entrance, connection promotor in promotor tank outlet measures pump intake, the outlet of dioxygen water stream injection pump connects hydrogen peroxide high-temperature water cooling atomizing lance entrance after converging with promotor metering pump export pipeline, spray gun is inserted into boiler back end ductwork, flue gas enters absorb the bottom of the tower through deduster, absorbing liquid of the slurry circulating pump countercurrent spray containing catalyst washs flue gas, absorb the bottom of the tower connects a second cyclone, second cyclone outlet at bottom connects nitrite treatments tank entrance, nitrite treatments tank outlet connection gypsum treatment system；The utility model realizes single column combined desulfurization and denitration demercuration, and simple process, removal efficiency is high, and operating cost is cheap, and the loss of catalyst is few；It can be applied to coal-fired power station boiler, Industrial Boiler, waste incinerator etc., especially suitable for built middle and small burn coal boiler is transformed, have a vast market application prospect.
Description
Technical field
The utility model belongs to coal-fired plant flue gas purification techniques field, and in particular to a kind of combined desulfurization based on calcium method
Denitration demercuration device.
Background technique
A large amount of flue dust, SO are discharged in coal unit operational process2, the atmosphere pollutions such as NOx and Hg, bring serious
Therefore environmental problem, the sustainable development for affecting the physical and mental health and economic society of people develop efficient pollutant catabolic gene
It is of great significance with purification techniques.
Currently, coal unit discharges pollutants, main control object is SO2, NOx and dust.
In addition, coal-fired flue-gas removing heavy metal Hg is imperative, and China was in 2011 with the continuous improvement of environmental requirement
The emission limit of clear stipulaties mercury is in " fossil-fuel power plant atmospheric pollutant emission standard " (the GB 13223-2011) newly implemented
0.03mg/m3.Common power plant pollution object control method is desulfurization by lime gypsum method, SCR denitration, electrostatic precipitation.Due to every kind
Pollutant catabolic gene means are removed primarily directed to Single Pollution object, cause the initial cost of each environmental protection equipment larger, system complex, factory
Land used is more, and operating cost is excessively high.There is presently no mature flue gas demercuration technology, existing environmental protection equipment takes off heavy metal Hg
Removing solid capacity is also limited.Wet process multi-pollutant joint removing sulfuldioxide can be realized in single column to be removed while multiple pollutant, is had
The advantages such as simple process, operating cost is low, are the developing direction of the following pollutant control technology.Wherein, it is preposition oxidation with efficiently
Absorb the hot spot for combining and realizing that the joint removing of wet process multi-pollutant is even more power environment protection area research in recent years.
Chinese invention patent (CN103463978B) is disclosed based on catalytic oxidation of hydrogen peroxide flue gas and desulfurizing and denitrifying
Device and method, in that patent hydrogen peroxide by be injected in catalyst surface catalysis generate active material；Chinese invention is special
Sharp (CN104923049B) discloses a kind of light radiation ozone/hydrogen peroxide solution simultaneous SO_2 and NO removal demercuration method, dioxygen in the patent
Water generates oxidisability hydroxyl radical free radical under ultraviolet radiation；Chinese utility model patent (CN1239235C) is disclosed while being taken off
The dry method flue gas cleaning technology and its system of sulphur denitration do not specify specific hydrogen peroxide spray technology, pollutant in that patent
It absorbs using individual dry desulfurization and Dry denitration technique.Chinese invention patent (CN100496675C) discloses while desulfurization
The wet ammonia flue gas cleaning technology and its system of denitration, hydrogen peroxide is injected in after deduster in flue gas in that patent, and
Demercuration effect is not referred to, and using ammonium hydroxide as desulfurization denitrification agent, reaction product setting oxidation fan carries out pressure oxidation.
Summary of the invention
The utility model existing pollutant combined removal technology there are aiming at the problem that, a kind of joint based on calcium method is provided
Desulfurization denitration demercuration device, using the efficiently preposition oxidation technology of flue, in conjunction with desulfurization by lime gypsum method, in addition organic catalyst
Effect, realize SO2、NOxIt is removed with the joint of Hg, the utility model can be applied to coal-fired power station boiler, Industrial Boiler, rubbish
Incinerator etc. has a vast market application prospect especially suitable for built middle and small burn coal boiler is transformed.
In order to realize that above-mentioned purpose of utility model, the technical solution adopted in the utility model are as follows:
A kind of combined desulfurization and denitration mercury removal device based on calcium method, including dioxygen water storage tank 1, the outlet of dioxygen water storage tank 1 connect
3 entrance of dioxygen water stream injection pump is connect, further includes promotor storage tank 2, connection 4 entrance of promotor metering pump in the outlet of promotor storage tank 2 is double
The outlet of oxygen water stream injection pump 3 connects 5 entrance of hydrogen peroxide high-temperature water cooling atomizing lance after converging with 4 export pipeline of promotor metering pump,
Hydrogen peroxide high-temperature water cooling atomizing lance 5 is inserted into 13 back-end ductwork of boiler, and back-end ductwork is connected to absorption tower 6, cigarette through deduster 12
Gas enters 6 bottom of absorption tower through deduster 12, and slurry circulating pump 7 is connected to 6 bottom absorbing liquid of absorption tower and top spray layer, adverse current
Absorbing liquid of 6 bottom of spray absorber containing organic catalyst washs flue gas, enters at the top of 6 bottom of absorption tower connection level-one cyclone 8
Mouthful, 8 middle part serum outlet of level-one cyclone connects 6 bottom of absorption tower, and 8 outlet at bottom of level-one cyclone connects second cyclone 9
Top entry, 9 middle part serum outlet of second cyclone connect 6 bottom of absorption tower, and 9 outlet at bottom of second cyclone connects nitrous acid
10 entrance of salt treatment tank, the outlet of nitrite treatments tank 10 connection gypsum treatment system 11.
The conical nozzle 14 of the hydrogen peroxide high-temperature water cooling atomizing lance 5 is symmetrical above and below, is mounted on hydrogen peroxide height at equal intervals
On the cold atomizing lance of warm water, for the narrow head of conical nozzle 14 as solution jet entrance and hydrogen peroxide solution pipeline connection, dioxygen is water-soluble
Liquid pipeline is connected to hydrogen peroxide inlet tube 15, and hydrogen peroxide solution pipeline is arranged in hydrogen peroxide high-temperature water cooling atomizing lance innermost layer；Spray
Rifle jet air pipeline 16 is arranged in hydrogen peroxide solution pipeline outer layer, and jet air enters from 14 side of conical nozzle, carries double
Oxygen aqueous solution is atomized from 14 wide opening position of conical nozzle to be sprayed；Spray gun water-cooled inner tube road connection spray gun water cooling tube inlet 17 is wrapped in
16 outer layer of spray gun jet air pipeline, the outer pipeline connection spray gun water cooling tube outlet 18 of spray gun water cooling are in hydrogen peroxide high-temperature water harl
Change the outermost layer arrangement of spray gun.
It is 300~500 DEG C that the hydrogen peroxide high-temperature water cooling atomization spray spray gun 5, which is inserted into the temperature section of 13 back-end ductwork of boiler,
The pressure limit of hydrogen peroxide solution is 0.1~0.3MPa, the pressure of spray gun jet air in hydrogen peroxide high-temperature water cooling atomizing lance 5
Range is 0.6MPa~0.8MPa, and spray gun water cooling tube exports the control of 18 temperature at 30~50 DEG C.
Hydrogen peroxide solution concentration is 20%~50wt% in the dioxygen water storage tank 1, and the amount of injection of hydrogen peroxide is H2O2/NO
Molar ratio=1.05~2；Promotor in the promotor storage tank 2 is sodium peroxydisulfate, sodium bicarbonate, hydroxylamine hydrochloride, resists
Bad hematic acid and sodium sulfite are one such or a variety of, and concentration range is 0.01% to 2% after mixing with hydrogen peroxide solution.
The organic catalyst contained in absorbing liquid in the absorption tower 6 is a kind of organic matter with aliphatic hydrocarbon, fat
Hydrocarbon includes any one of methyl, ethyl, propyl, butyl etc., and the addition concentration of organic catalyst is 0.1%~5%；
The catalyst recovery yield of the level-one cyclone 8 is greater than 95%, and the catalyst recovery yield of second cyclone 9 is greater than
90%.
6 bottom of absorption tower is not provided with oxidation fan.
A kind of combined desulfurization and denitration demercuration method of combined desulfurization and denitration mercury removal device based on calcium method, dioxygen
Water is sprayed into 13 tail portion high-temperature flue of boiler after mixing with promotor by hydrogen peroxide high-temperature water cooling atomizing lance 5, moment orientation
Strong oxidizing property free radical OH is generated by the NO and Hg in flue gas0It is oxidized to NO2And Hg2+, the absorbing liquid in absorption tower 6, which contains, to be had
Machine catalyst absorbs SO by spraying layer countercurrent spray2、NO2And Hg2+, realize combined desulfurization and denitration demercuration, having in absorbing liquid
Machine catalyst passes through 9 recycling and reusing of level-one cyclone 8 and second cyclone；The slurries of absorb the bottom of the tower are introduced into level-one eddy flow
Device 8 contains a large amount of organic catalyst, pumps after being extracted since organic catalyst is not soluble in water in the slurries of upper layer after eddy flow
Absorption tower 6 is gone back to, the slurries containing a large amount of gypsum enter second cyclone 9 in lower layer's slurries；Second cyclone 9 continues separation catalysis
Upper layer is contained the slurries of a small amount of catalyst, further returns absorption tower by agent, guarantees the rate of recovery of catalyst, second level eddy flow
9 lower layer's slurries of device enter gypsum treatment system 11 after the processing of nitrite treatments tank 10, and nitrite anions end reaction generates nitrogen
Gas, sulfur dioxide and nonvalent mercury generate gypsum and bivalent mercury discharge system.
Joint elimination reaction principle is as follows:
Hg+4·OH→Hg2++2H2O+O2
NO+·OH→NO2+·H
SO2+H2O→H2SO3
H2SO3+ catalyst → catalyst H2SO3
Catalyst H2SO3+2NO2+H2O→2HNO2+H2SO4+ catalyst
Ca(OH)2+H2SO4→CaSO4↓+2H2O
Ca(OH)2+HNO2→Ca(NO2)2+2H2O
Sulfur dioxide is dissolved in the inferior sulfate radical of water generation in absorption tower, is combined into more stable complexing with organic catalyst
Object, this complex compound and NO2Contact occurs redox reaction and generates nitrous acid, and the inferior sulfate radical of organic catalyst complexing occurs anti-
Ying Hou, organic catalyst can continue that H is complexed2SO3It completes to recycle, certain organic catalysis agent content can guarantee in absorbing liquid
A certain amount of inferior sulfate radical in absorbing liquid guarantees NO2Removal efficiency.
Absorb the bottom of the tower is not provided with oxidation fan, by NO2It is carried out freely with the inferior sulfate radical not being complexed by catalyst
Base chain reaction generates sulfate radical, and reaction speed is exceedingly fast, and is not required to setting oxidation fan i.e. and can guarantee that the crystallization of gypsum generates, reaction
Principle is as follows:
The utility model has the following characteristics:
1) oxidation efficiency is high, and hydrogen peroxide waste is few: the utility model selection hydrogen peroxide is atomized in high-temperature flue gas, moment
The free group of strong oxidizing property is excited, NO and Hg is aoxidized0, oxidation efficiency height；Before dioxygen water atomization, by adding radical-scavenging
Agent reduces atomizing pressure and increases the means such as spray gun cooling effect, reduces the invalid selfdecomposition of hydrogen peroxide, hydrogen peroxide waste
It is few.
2) simple process is widely used: the utility model only increases double on the basis of not changing power plant's existing equipment
Oxygen water injection system and catalyst recovery devices add a small amount of organic catalyst, and it is de- that efficient combined desulfurization and denitration can be realized
Mercury, simple process, operating cost is cheap, is widely used in existing limestone-gypsum method absorption tower transformation.
3) pollutant does not generate secondary pollution: sulfureous in flue gas oxide is finally reflected generation gypsum, nitrogen oxidation by this method
Object end reaction generates nitrogen, and bivalent mercury is finally discharged with gypsum, and content is extremely low not to generate secondary pollution.
Detailed description of the invention
Fig. 1 is a kind of method and device thereof system signal of combined desulfurization and denitration demercuration based on calcium method of the utility model
Figure.
Fig. 2 is the schematic diagram of the utility model hydrogen peroxide high-temperature water cooling atomizer.
In figure, 1 is dioxygen water storage tank, and 2 be promotor storage tank, and 3 be dioxygen water stream injection pump, and 4 be promotor metering pump, and 5 are
Hydrogen peroxide high-temperature water cooling atomizing lance, 6 be absorption tower, and 7 be slurry circulating pump, and 8 be level-one cyclone, and 9 be second cyclone, 10
It is nitrite treatments tank, 11 be gypsum treatment system, and 12 be deduster, and 13 be boiler, and 14 be conical nozzle, and 15 be hydrogen peroxide
Inlet tube, 16 be spray gun jet air pipeline, 17 spray gun water cooling tube inlets, the outlet of 18 spray gun water cooling tubes.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
Embodiment 1:
A kind of combined desulfurization and denitration demercuration method based on calcium method of the present embodiment, process flow is as shown in Figure 1, selection tail portion
Flue gas temperature installs hydrogen peroxide high-temperature water cooling atomization spray spray gun 5 at 350 DEG C, and the concentration of hydrogen peroxide solution is 27.5wt%, double
Oxygen water and NO and Hg0Injection molar ratio be 1.1:1, realize that the oxygenation efficiency of nitrogen oxides and nonvalent mercury is greater than 98%.
As preferred embodiments of the present invention, the promotor in promotor storage tank is sodium peroxydisulfate, adds concentration
It is 0.1%.
As preferred embodiments of the present invention, the pressure of jet stream compressed air in dioxygen high-temperature water cooling atomizing lance
For 0.8MPa, the pressure for pumping hydrogen peroxide solution is 0.2MPa, adjusts the flow of cooling compressed air in spray gun, controls hydrogen peroxide
Temperature is lower than 40 DEG C in entrance pipe.
As preferred embodiments of the present invention, selecting the concentration of catalyst in absorption tower is 0.1%, guarantees to absorb
Desulfuration efficiency is greater than 99% in tower, and denitration efficiency is greater than 95%, and demercuration efficiency is greater than 90%.
Level-one eddy flow is chosen as preferred embodiments of the present invention for the recovery efficiency for guaranteeing organic catalyst
The swirl velocity of device is greater than second cyclone, and the catalyst recovery yield of level-one cyclone is not less than 95%, urges in second cyclone
The rate of recovery of agent is not less than 90%, it is ensured that the proportion of goods damageds of catalyst are smaller.
Embodiment 2:
The present embodiment selection back-end ductwork smoke temperature installs hydrogen peroxide high-temperature water cooling atomization spray spray gun 5, hydrogen peroxide at 500 DEG C
The concentration 50% of solution, addition promotor are sodium peroxydisulfate and sodium bicarbonate, concentration 0.5%, hydrogen peroxide and NO and Hg0Rub
, than being 1.05:1, the compressed air pressure of hydrogen peroxide high-temperature water cooling atomization spray spray gun 5 is 0.6MPa for you, pumps hydrogen peroxide solution pressure
Power is 0.3MPa, so that temperature is lower than 50 DEG C in hydrogen peroxide entrance pipe, nitrogen oxides and nonvalent mercury oxidation efficiency may be implemented
Not less than 98%, catalyst 1% is added in absorption tower, realizes that desulfuration efficiency is greater than 99%, denitration efficiency is greater than 95%, demercuration effect
Rate is greater than 95%.
Embodiment 3:
The present embodiment selection back-end ductwork smoke temperature installs hydrogen peroxide high-temperature water cooling atomization spray spray gun 5, hydrogen peroxide at 400 DEG C
The concentration 35% of solution, addition promotor are ascorbic acid and sodium sulfite, concentration 1%, hydrogen peroxide and NO and Hg0Mole
Than being 0.7MPa, pumping hydrogen peroxide solution pressure for the compressed air pressure of 1.1:1, hydrogen peroxide high-temperature water cooling atomization spray spray gun 5
Nitrogen oxides and nonvalent mercury oxidation efficiency may be implemented not so that temperature is lower than 30 DEG C in hydrogen peroxide entrance pipe for 0.25MPa
Lower than 99%, catalyst 3% is added in absorption tower, realizes that desulfuration efficiency is greater than 99%, denitration efficiency is greater than 95%, demercuration efficiency
Greater than 98%.
Claims (3)
1. a kind of combined desulfurization and denitration mercury removal device based on calcium method, which is characterized in that including dioxygen water storage tank (1), hydrogen peroxide
Connection dioxygen water stream injection pump (3) entrance in storage tank (1) outlet further includes promotor storage tank (2), promotor storage tank (2) outlet connection
Promotor metering pump (4) entrance, dioxygen water stream injection pump (3) outlet connect double after converging with promotor metering pump (4) export pipeline
Oxygen water high-temperature water cooling atomizing lance (5) entrance, hydrogen peroxide high-temperature water cooling atomizing lance (5) are inserted into boiler (13) back-end ductwork,
Back-end ductwork is connected to absorption tower (6) through deduster (12), and flue gas enters absorption tower (6) bottom, serum recycle through deduster (12)
(7) connection absorption tower (6) bottom absorbing liquid and top spray layer are pumped, countercurrent spray absorption tower (6) bottom is containing organic catalyst
Absorbing liquid washs flue gas, and absorption tower (6) bottom connects level-one cyclone (8) top entry, and slurries go out in the middle part of level-one cyclone (8)
Mouth connection absorption tower (6) bottom, level-one cyclone (8) outlet at bottom connect second cyclone (9) top entry, second cyclone
(9) middle part serum outlet connects absorption tower (6) bottom, and second cyclone (9) outlet at bottom connects nitrite treatments tank (10)
Entrance, nitrite treatments tank (10) outlet connection gypsum treatment system (11).
2. a kind of combined desulfurization and denitration mercury removal device based on calcium method as described in claim 1, it is characterised in that: the dioxygen
The conical nozzle (14) of water high-temperature water cooling atomizing lance (5) is symmetrical above and below, is mounted on the atomization spray of hydrogen peroxide high-temperature water cooling at equal intervals
On rifle, conical nozzle (14) narrow head is as solution jet entrance and hydrogen peroxide solution pipeline connection, hydrogen peroxide solution pipeline connection
Hydrogen peroxide inlet tube (15), hydrogen peroxide solution pipeline are arranged in hydrogen peroxide high-temperature water cooling atomizing lance innermost layer；Spray gun jet stream is empty
Air pipe (16) is arranged in hydrogen peroxide solution pipeline outer layer, and jet air enters from conical nozzle (14) side, carries hydrogen peroxide
Solution is atomized from conical nozzle (14) wide opening position to be sprayed；Spray gun water-cooled inner tube road connection spray gun water cooling tube inlet (17) is wrapped in
Spray gun jet air pipeline (16) outer layer, the outer pipeline connection spray gun water cooling tube outlet (18) of spray gun water cooling are in hydrogen peroxide high-temperature water
The cold outermost layer arrangement of atomizing lance.
3. a kind of combined desulfurization and denitration mercury removal device based on calcium method as described in claim 1, it is characterised in that: the absorption
Tower (6) bottom is not provided with oxidation fan.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173718A (en) * | 2018-11-08 | 2019-01-11 | 华能国际电力股份有限公司 | A kind of method and device thereof of the combined desulfurization and denitration demercuration based on calcium method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173718A (en) * | 2018-11-08 | 2019-01-11 | 华能国际电力股份有限公司 | A kind of method and device thereof of the combined desulfurization and denitration demercuration based on calcium method |
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