CN109092043A - boiler flue gas desulfurization device - Google Patents
boiler flue gas desulfurization device Download PDFInfo
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- CN109092043A CN109092043A CN201811045687.5A CN201811045687A CN109092043A CN 109092043 A CN109092043 A CN 109092043A CN 201811045687 A CN201811045687 A CN 201811045687A CN 109092043 A CN109092043 A CN 109092043A
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- desulfurization wastewater
- flue gas
- desulfurization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention discloses a kind of boiler flue gas desulfurization devices, it is related to boiler smoke processing technology field, including absorption tower interconnected, sulfur dioxide absorption system, the lime stone preparation circulatory system, gypsum dehydration system, desulfurization wastewater treatment system and exhaust system；Desulfurization wastewater treatment system is made of desulfurizer waste water treatment system, chemical medicine system, sludge dewatering system three subsystems；The effect for the content of beary metal for being handled by the mutually collaboration of each system, effectively boiler smoke being handled, had and improve its desulfurization stability, and then improve its desulfuration efficiency, while be effectively reduced in boiler smoke discharge.
Description
Technical field
The present invention relates to boiler smoke processing technology fields, more specifically, it relates to a kind of boiler flue gas desulfurization device.
Background technique
Boiler is a kind of energy conversion, and the energy inputted to boiler has chemical energy, electric energy in fuel, boiler output
Steam, high-temperature water or organic heat carrier with certain thermal energy.The original meaning of pot refers to that the water container heated on fire, furnace refer to burning
The place of fuel, boiler include pot and furnace two large divisions.The hot water or steam generated in boiler can directly be industrial production and people
The people's livelihood is living to provide required thermal energy, mechanical energy can also be converted to by Steam Power Equipment, or again turn mechanical energy by generator
It is changed to electric energy.Since cost is relatively low for the burning of coal, China's most enterprises are still using traditional coal as boiler oil.
But coal can generate more sulfide in combustion, direct emission will certainly cause environment can not estimate
The pollution of amount；With the development of society, the environmental consciousness of people is more and more stronger and the increasing of Environmental protection,
Country is set with discharge standard to the discharge of boiler smoke at present, so existing exhaust gas treatment requirement is also higher；Mesh
It is preceding for boiler flue gas desulfurization device in atm number, continuous processing flue gas, occur that desulfurization performance is unstable, and desulfuration efficiency is low
Problem.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of boiler flue gas desulfurization device, have
Its desulfurization stability is improved, and then improves the effect of its desulfuration efficiency.
To achieve the above object, the present invention provides the following technical scheme that
A kind of boiler flue gas desulfurization device, including absorption tower interconnected, sulfur dioxide absorption system, lime stone preparation circulation
System, gypsum dehydration system, desulfurization wastewater treatment system and exhaust system；The desulfurization wastewater treatment system includes successively connecting
Desulfurization wastewater collecting pit, desulfurization wastewater neutralization pond, desulfurization wastewater settling tank, the desulfurization wastewater flocculation basin, desulfurization wastewater clarification connect
Pond, desulfurization wastewater conditioning tank, desulfurization wastewater oxidation pond and desulfurization wastewater discharge bay, the desulfurization wastewater neutralization pond, desulfurization are useless
Water settling tank, desulfurization wastewater flocculation basin, desulfurization wastewater clarifying basin, desulfurization wastewater conditioning tank, desulfurization wastewater oxidation pond are separately connected
There are lime milk dosing case, clairtan dosing tank, flocculation aid dosing tank, organic sulfur compound dosing tank, hydrochloric acid dosing tank, oxidation
Agent dosing tank, the desulfurization wastewater settling tank and desulfurization wastewater flocculation basin are connected with sludge dewatering system.
So set, the SO in the hot fume that boiler generates2Removal carried out first in absorption tower, that is, sulfur dioxide
Absorption system prepares the lime stone absorbent slurry that the circulatory system provides by lime stone and is absorbed, while negative according to flue gas
SO in lotus, absorption tower2Concentration and pH value spray into the limestone slurry liquid measure on absorption tower to control, the work for reaching circulation preparation and utilizing
With；Secondly the lime stone slurry after absorbing flue gas to absorption tower is delivered to gypsum dehydration system and is carried out dehydrating, after dehydrated
Slurries form stone solid content paste and waste water, solidfied material are recycled and handle accordingly, waste water is then delivered to
Desulfurization wastewater treatment system carries out advanced treating；Waste water is firstly transferred to the collection of desulfurization wastewater collecting pit, and it is useless to then flow through desulfurization
Water neutralization pond is offerd medicine by lime milk dosing case and is neutralized, and being conducive to heavy metal ion in alkaline environment, (heavy metal refers to high ratio
The metal of weight；The espespecially metal that specific gravity is 5 or more, such as iron, cobalt, nickel, copper, lead, zinc, chromium, mercury, cadmium, niobium, tantalum, molybdenum, tungsten)
Precipitating, Ca (OH)2Addition increase the pH value of waste water, to make Fe3+、Zn2+、Cu2+、Ni2+、Cr3+Etc. heavy metal ion it is raw
Hydrate precipitating, when pH value reaches 9.0~9.5, most of heavy metal ion have been respectively formed indissoluble hydroxide.Together
When, the Ca in lime slurry2+It can also be with the F in waste water-Reaction, generates the CaF of indissoluble2；With As3+Complexing generates Ca3(AsO3)2
Equal indissolubles substance.Secondly, the waste water after neutralized precipitating is delivered to desulfurization wastewater settling tank, in waste water also containing there are many tiny and
The particle and colloidal substance of dispersion flocculate so medicament is added by clairtan dosing tank, it is useless to be subsequently passed desulfurization
It helps solidifying in water flocculation pond and by flocculation aid dosing tank, makes their coacervating large particles and deposit, further promote hydrogen-oxygen
The precipitating of compound and sulfide makes tiny flocculate slowly become floccule that is bigger, being easier to deposition, while in desulfurization wastewater
Suspended matter and other impurities also settle down, desulfurization wastewater settling tank and sediment and wadding under desulfurization wastewater flocculation basin
Condensate deposition is concentrated by gravity concentration at sludge, and by sludge dewatering system,；Waste water after flocculation is from desulfurization wastewater
Flocculation basin overflow enters desulfurization wastewater clarifying basin, is handled by organic sulfur compound dosing tank the microorganism in waste water, then
It is delivered to desulfurization wastewater conditioning tank and is adjusted to neutrality waste water by hydrochloric acid dosing tank；It is finally passed through desulfurization wastewater oxidation pond and leads to
The dispensing of peroxide agent dosing tank adjusts COD value and pH value, discharges after up to standard or circulation comprehensive utilizes again；Flue gas passes sequentially through
Absorption tower, sulfur dioxide absorption system, lime stone preparation the circulatory system, gypsum dehydration system, desulfurization wastewater treatment system and
Exhaust system absorbs its flue gas in advance, then is neutralized, flocculated to the lime stone slurry after absorption, precipitated, at adjusting
Reason, make its it is final it is up to standard after, flue gas, waste water, waste are carried out to the effect of discharge and recycling and reusing after up to standard, not only improve it
Desulfurization stability, and then the effect for the content of beary metal for improving its desulfuration efficiency, while being effectively reduced in boiler smoke discharge.
Further setting: it is respectively arranged with air inlet and exhaust outlet on the absorption tower, is set at the air inlet
It is equipped with accident spray water system, the exhaust ports are provided with demister and wet scrubber, air inlet is set to exhaust
The lower section of mouth, demister are set to below wet scrubber.
So set, boiler smoke is entered after absorption tower handled from below to up by air inlet, then pass through exhaust outlet
Absorption tower is discharged；By being provided with accident spray water system at air inlet, when air inlet smoke temperature is more than setting value, to entrance
The flue gas of absorption tower entrance carries out spraying cooling；Remove SO2And the flue gas of other pollutants through the demister above absorption tower into
Row removes droplet, then is dusted by wet scrubber, is then exhausted from absorption tower after up to standard, improves the treatment effeciency of its boiler smoke
And processing quality.
Further setting: the sulfur dioxide absorption system includes that the spraying layer being set in absorption tower and spraying layer connect
The slurry circulating pump that connects and the reaction collecting pit for being set to absorption tower bottom end, the slurry circulating pump and lime stone preparation recycle
System connection.
So set, flue gas flows from bottom to top after entering absorption tower, lime stone is prepared the circulatory system by slurry circulating pump
Slurries be delivered to spraying layer, make its slurries spray and under lime stone slurry haptoreaction, flue gas cools down and reached by slurries
It is saturated, the SO in flue gas2、SO3, the acid ingredients such as HCl, HF be absorbed, finally fall in reaction collecting pit and be collected, reach
The effect of harmful substance in absorption flue gas, while achieving the effect that desulfurization.
Further setting: the first agitating paddle is provided in the reaction collecting pit.
So set, making its slurries by the first agitating paddle after the slurries after absorption flue gas are fallen in reaction collecting pit
It is stirred, prevents from reacting grout curing in collecting pit, be handled again convenient for the later period.
Further setting: the spraying layer is provided with multilayer, and is connected between every layer of spraying layer by connection main pipe, spraying layer
Layout design is at uniform fold in the cross section on absorption tower.
So set, lime stone slurry spray after with after smoke contacts, SO2Equal gases and multilayer are covered in absorption tower
Cross section spraying layer contact, increase time of contact and the contact internal circulating load of lime stone and flue gas, also just increase lime stone
With SO2Haptoreaction chance, to improve SO2Removal rate.In addition, increasing the internal circulating load of lime stone, mixing slurry will be promoted
HSO in liquid3 ?It is oxidized to SO4 2-, be conducive to the formation of gypsum.
Further setting: the reaction collecting pit is connected with snorkel and emptying pump, and the snorkel is connected with oxidation
Blower, the emptying pump are connect with gypsum dehydration system.
So set, the oxidation air that oxidation fan is sent out enters reaction collecting pit, the sulfurous acid that desulphurization reaction is generated
Oxidation is forced to generate sulfuric acid, sulfuric acid and calcium carbonate reaction generate calcium sulfate and crystallize generation dihydrate gypsum；Another aspect part oxygen
Gas is in absorption tower, by a part of HSO3 ?On absorption tower, spraying zone is by the dioxygen oxidation in flue gas, the HSO of rest part3 ??
Air complete oxidation is oxidized in reaction tank, to guarantee dissolution and the SO of lime stone2Fully absorb, improve processing to flue gas
Effect.
Further setting: the pH value control range of slurries is between 5.2~5.8 in the lime stone preparation circulatory system.
So set, the slurry environments of the high pH of slurry pH value are conducive to SO in the lime stone preparation circulatory system2Absorption, and
Low pH then facilitates Ca2+Precipitation, be found by experiment that, in a certain range with the raising of absorption tower slurries pH, desulfurization degree
It is general also in rising trend, because high pH means the CaCO for having more in slurries3In the presence of, it is certainly beneficial to desulfurization, but pH >
Desulfurization degree will not continue to increase after 5.8, reduce instead, the reason is that with H+The reduction of concentration, Ca2+Precipitation it is more and more difficult,
Therefore, slurries pH control can be such that the Ca/S of desulphurization reaction is maintained at and set between 5.2~5.8 in the lime stone preparation circulatory system
In evaluation (1.03 or so), ideal desulfurization degree is obtained, while making CaCO in slurries again3Content be lower than 1%.
Further setting: the gypsum dehydration system includes gypsum slurries baffle-box, connect with gypsum slurries baffle-box
Gypsum cyclone and the vacuum hydroextractor connecting with gypsum cyclone are provided with overflow water outlet on the vacuum hydroextractor
Mouthful, the overflow water outlet is provided with filter cloth, and overflow water outlet is connected with filtrate box.
So set, by absorption tower be discharged gypsum slurries be transported to gypsum slurries baffle-box, then gypsum cyclone into
Row, which is concentrated into after concentration about 55%, to be flowed automatically to vacuum belt dewaterer for slurries and is dehydrated, and overflow water passes through overflow water outlet
Discharge, and filtered again by filter cloth, it is finally handled by filtrate box collection, the waste water formed after raising processing carries out again
The effect of processing, pollution when reducing discharge to environment.
Further setting: the exhaust system includes that the accident slurry tank connecting with absorption tower and lime stone preparation recycle
System and the drain of gypsum dehydration system connection, the drain are pumped by drain and are connect with accident slurry tank.
So set, when need to empty absorption tower overhauled when, the slurries in absorption tower drain into accident slurry tank, remaining
Slurries enter drain by flow by gravity, then squeeze into accident slurry tank by drain pump, improve the operation to slurries in absorption tower
Performance.
Further setting: the boiler flue gas desulfurization device further includes technique water system, control system and electrical system,
The technique water system is connect with absorption tower and sulfur dioxide absorption system respectively, the control system and electrical system point
The circulatory system, gypsum dehydration system, desulfurization wastewater treatment system are not prepared with absorption tower, sulfur dioxide absorption system, lime stone
And exhaust system connection.
So set, technique water system is convenient for providing water source supply to each system, control system and electrical system are just
In a system is managed collectively and is precisely controlled, the conveniently operation and managerial role to entire process flow.
By using above-mentioned technical proposal, the present invention compares compared with the prior art, has the advantage that
1, baffling comes into full contact with the slurries sprayed upwards after former flue gas enters absorption tower, and flue gas is cooled down and reached by slurries
It is saturated, the SO in flue gas2、SO3, the acid ingredients such as HCl, HF be absorbed, then flow in series through demister and remove contained droplet, mention
Height is to fume treatment performance and desulfidation；
2, the oxidation air that oxidation fan is sent out enters absorption tower after work of water sprinkling for better material moisture, and the sulfurous acid that desulphurization reaction is generated is strong
Oxygenerating generates sulfuric acid, and sulfuric acid and calcium carbonate reaction generate calcium sulfate and crystallize generation dihydrate gypsum, improve to sulfureous in flue gas
The process performance of object；
3, by the mutual cooperation of each system and successively, processing, flue gas pass sequentially through absorption tower, sulfur dioxide absorption system, stone
Lime stone prepares the circulatory system, gypsum dehydration system, desulfurization wastewater treatment system and exhaust system, inhales its flue gas in advance
Receive, handled in being carried out to the lime stone slurry after absorption with flocculation, precipitating, adjusting, make its it is final it is up to standard after, by flue gas, useless
The effect that discharge and recycling and reusing are carried out after water, waste are up to standard, not only improves its desulfurization stability, and then improve its desulfurization
Efficiency, while the effect for the content of beary metal being effectively reduced in boiler smoke discharge.
Detailed description of the invention
Fig. 1 is the flow diagram of boiler flue gas desulfurization device；
Fig. 2 is the structural schematic diagram on absorption tower in boiler flue gas desulfurization device；
Fig. 3 is the structural schematic diagram that lime stone prepares the circulatory system in boiler flue gas desulfurization device；
Fig. 4 is the structural schematic diagram of gypsum dehydration system in boiler flue gas desulfurization device；
Fig. 5 is desulfurization wastewater neutralization pond and the structural schematic diagram of milk of lime preparation in desulfurization wastewater treatment system；
Fig. 6 is the structural schematic diagram of lime milk dosing case；
Fig. 7 is the structural schematic diagram of drainage system in boiler flue gas desulfurization device.
In figure: 1, absorption tower；11, air inlet；12, exhaust outlet；13, accident spray equipment；131, jet pipe；132, valve；
133, emergency episode sprays water source；14, demister；15, wet scrubber；2, sulfur dioxide absorption system；21, spraying layer；
211, distribution arms；212, nozzle；213, main pipe is connected；22, slurry circulating pump；23, collecting pit is reacted；251, snorkel；
252, emptying pump；253, oxidation fan；26, the first agitating paddle；3, lime stone prepares the circulatory system；31, orlop Weighting type is fed
Machine；32, limestone slurry flow container；4, gypsum dehydration system；41, gypsum slurries baffle-box；42, gypsum cyclone；43, vacuum dehydration
Machine；44, overflow water outlet；45, filter cloth；46, filtrate box；5, desulfurization wastewater treatment system；51, waste water treatment system；511,
Desulfurization wastewater collecting pit；512, desulfurization wastewater neutralization pond；5121, pulverized limestone storage bin；5122, hopper is shaken；5123, spiral is given
Material machine；5124, milk of lime agitating solution case；5125, dosing pump；5126, belt dust-precipitator；5127, flapper is rotated；5128,
Second agitating paddle；513, desulfurization wastewater settling tank；514, desulfurization wastewater flocculation basin；515, desulfurization wastewater clarifying basin；516, desulfurization
Wastewater equalization pond；517, desulfurization wastewater oxidation pond；518, desulfurization wastewater discharge bay；52, chemical medicine system；521, milk of lime adds
Medicine-chest；522, clairtan dosing tank；523, flocculation aid dosing tank；524, organic sulfur compound dosing tank；525, hydrochloric acid dosing
Case；526, oxidant dosing tank；527, blow-down pipe；528, it is vented valve；529, non-return valve；53, sludge dewatering system；6, it discharges
System；61, accident slurry tank；62, drain；63, drain pumps；7, technique water system；8, control system；9, electrical system.
Specific embodiment
Boiler flue gas desulfurization device is described further referring to attached drawing.
A kind of boiler flue gas desulfurization device, as shown in Figure 1, including absorption tower 1 interconnected, sulfur dioxide absorption system
2, lime stone preparation the circulatory system 3, gypsum dehydration system 4, desulfurization wastewater treatment system 5, exhaust system 6, technique water system 7,
Control system 8 and electrical system 9.
Wherein, as shown in Fig. 2, absorption tower 1 use countercurrent spray tower, be respectively arranged on absorption tower 1 air inlet 11 with
And exhaust outlet 12, and air inlet 11 is set to the lower section of exhaust outlet 12, the hot fume come from boiler is by being set to air inlet 11
The air-introduced machine at place is introduced to absorption tower 1, and the exhaust outlet 12 that hot fume flows to top from bottom to top is discharged.
As shown in Fig. 2, being provided with accident spray equipment 13 at air inlet 11, accident spray equipment 13 includes jet pipe
131 and valve 132, and emergency episode is connected with by water pump and sprays water source 133.When the hot fume temperature of air inlet 11 is more than to set
When definite value (generally 180 DEG C), control system 8 controls corresponding valve 132 in accident spray equipment 13 and opens, and absorbs to entering
The hot fume of 1 inlet port of tower carries out spraying cooling.
As shown in Fig. 2, sulfur dioxide absorption system 2 includes that the spraying layer 21 being set in absorption tower 1 and spraying layer 21 connect
It is prepared by the slurry circulating pump 22 that connects and the reaction collecting pit 23 for being set to 1 bottom end of absorption tower, slurry circulating pump 22 and lime stone
The circulatory system 3 connects.
In conjunction with shown in Fig. 2 and Fig. 3, lime stone prepare the circulatory system 3 preparation process it is as follows: finished powder through agstone from
Orlop Weighting type batcher 31 is discharged, into 32 slurrying of limestone slurry flow container；Agstone and technique in limestone slurry flow container 32
Process water mixing in water system 7, manufactured lime stone slurry is delivered to spraying layer 21 by slurry circulating pump 22, according to hot cigarette
SO at gas load, 1 air inlet 11 of absorption tower2Concentration and pH value spray into the limestone slurry liquid measure on absorption tower 1 to control.
As shown in Fig. 2, spraying layer 21 is set between air inlet 11 and exhaust outlet 12, and spraying layer 21 is high along absorption tower 1
Degree direction is provided with multilayer；Every layer of spraying layer 21 is by distribution arms 211 and the nozzle being set in distribution arms 211 212
Composition, 211 layout design of distribution arms is at uniform fold in the cross section on absorption tower 1；Distribution arms on every layer of spraying layer 21
It is connected between 211 by connection main pipe 213, connection main pipe 213 is connect with slurry circulating pump 22.
As shown in Fig. 2, absorbing SO from the lime stone that spraying layer 21 sprays2Slurries fall into reaction collecting pit 23, anti-
It answers and is provided with the first agitating paddle 26 in collecting pit 23, the first agitating paddle 26 may be provided with multiple, and the first agitating paddle 26 is set to
It is had concurrently on the bottom of reaction collecting pit 23 or side wall, or both.
As shown in Fig. 2, reaction collecting pit 23 is connected with snorkel 251 and emptying pump 252；Snorkel 251 be connected with by
Oxidation air blasts the oxidation fan 253 in reaction collecting pit 23, and oxidation fan 253 uses oxygen rifle formula, and laggard by being humidified
Enter absorption tower 1；Make part of it HSO3-Spraying layer 21 in absorption tower 1 by the dioxygen oxidation in hot fume, rest part
HSO3-Air complete oxidation is oxidized in reaction collecting pit 23；It is made of stones to be passed through lime for a part of slurries in reaction collecting pit 23
Have the function that recycling with new lime stone neutralization in the standby circulatory system 3, while adjusting in the lime stone preparation circulatory system 3
The pH value of slurries is between 5.2~5.8；It reacts another part slurries in collecting pit 23 and passes through emptying pump 252 and gypsum dehydration
System 4 connects.
As depicted in figs. 1 and 2, demister 14 and wet scrubber 15 are provided at exhaust outlet 12, demister 14 is set
It is placed in 15 lower section of wet scrubber, and is both connect with technique water system 7；Demister 14 is designed as level-one tubular demister 14
With twin-stage ridge type demister 14,1 top of absorption tower is arranged in using traditional overhead type, and demister 14 is by polypropylene material
It is made.
As shown in Fig. 2, flue gas is entered the spraying layer 21 on absorption tower 1 by air inlet 11, saturation temperature is cooled in this flue gas
It spends, the SO in flue gas2It is absorbed by lime stone, with misty slurries counter current contacting in uphill process, treated in tower flue gas
After demister 14 by being arranged in 1 top of absorption tower removes water droplet, make its water droplet carrying amount no more than 35mg/Nm3, enter back into
Wet-esp is dusted processing, is discharged finally by exhaust outlet 12.
As shown in Figure 2 and Figure 4, gypsum dehydration system 4 include the gypsum slurries baffle-box 41 being connect with emptying pump 252, with
The gypsum cyclone 42 that gypsum slurries baffle-box 41 connects and the vacuum hydroextractor 43 being connect with gypsum cyclone 42；In vacuum
It is provided with overflow water outlet 44 on dewaterer 43, filter cloth 45 is provided at overflow water outlet 44, and overflow water outlet 44 connects
It is connected to filtrate box 46.
As shown in Figure 1, desulfurization wastewater treatment system 5 is by desulfurizer waste water treatment system 51, chemical medicine system 52, dirt
53 three subsystems of mud dewatering system are constituted.
As shown in Figure 1, desulfurizer waste water treatment system 51 includes sequentially connected desulfurization wastewater collecting pit 511, desulfurization
Wastewater neutralizer 512, desulfurization wastewater settling tank 513, desulfurization wastewater flocculation basin 514, desulfurization wastewater clarifying basin 515, desulfurization wastewater
Conditioning tank 516, desulfurization wastewater oxidation pond 517 and desulfurization wastewater discharge bay 518；Desulfurization wastewater collecting pit 511 and filtrate box 46
Connection, desulfurization wastewater settling tank 513 and desulfurization wastewater flocculation basin 514 are connect with sludge dewatering system 53.
As shown in Figure 1, chemical medicine system 52 include respectively with desulfurization wastewater neutralization pond 512, desulfurization wastewater settling tank
513, desulfurization wastewater flocculation basin 514, desulfurization wastewater clarifying basin 515, desulfurization wastewater conditioning tank 516, desulfurization wastewater oxidation pond 517 connect
The lime milk dosing case 521 that connects, clairtan dosing tank 522, flocculation aid dosing tank 523, organic sulfur compound dosing tank 524,
Hydrochloric acid dosing tank 525, oxidant dosing tank 526.
As shown in Figure 1, wherein pH value is 9.5~10 in desulfurization wastewater neutralization pond 512, is helped in flocculation aid dosing tank 523 solidifying
Agent is coagulant PAM；PH value is 6~9 in desulfurization wastewater conditioning tank 516；Lime milk dosing case 521, clairtan dosing tank
522, flocculation aid dosing tank 523, organic sulfur compound dosing tank 524, hydrochloric acid dosing tank 525, oxidant dosing tank 526 are carbon steel
Anti-corrosion dosing tank.As shown in connection with fig. 6, for convenience of safeguarding and overhauling, in lime milk dosing case 521, clairtan dosing tank
522, flocculation aid dosing tank 523, organic sulfur compound dosing tank 524, hydrochloric acid dosing tank 525, be respectively provided on oxidant dosing tank 526
There are blow-down pipe 527 and emptying valve 528, in lime milk dosing case 521, clairtan dosing tank 522, flocculation aid dosing tank
523, organic sulfur compound dosing tank 524, hydrochloric acid dosing tank 525, oxidant dosing tank 526 exit be provided with non-return valve
529。
As shown in figure 5, being provided with pulverized limestone storage bin 5121, pulverized limestone storing in the top of desulfurization wastewater neutralization pond 512
Storehouse 5121 is connected with vibration hopper 5122, is provided with screw(-type) feeder 5123, screw(-type) feeder 5123 in vibration hopper 5122
Outlet end be connected with milk of lime agitating solution case 5124, milk of lime agitating solution case 5124 passes through dosing pump 5125 and milk of lime
Dosing tank 521 connects；Make the Ca (OH) in pulverized limestone storage bin 51212Powder passes through vibration hopper 5122 and screw(-type) feeder 5123
Metering conveying Ca (OH)2To milk of lime agitating solution case 5124.
As shown in figure 5, belt dust-precipitator 5126 is provided in 5121 upper end of pulverized limestone storage bin, in pulverized limestone storage bin
5121 bottom ends are equipped with rotation flapper 5127；And it is useless in desulfurization wastewater neutralization pond 512, desulfurization wastewater conditioning tank 516 and desulfurization
It is provided with the second agitating paddle 5128 in water oxidation pond 517, reaches uniformly mixed and well-mixed effect.
As shown in fig. 7, exhaust system 6 includes that the accident slurry tank 61 connecting with absorption tower 1 and lime stone prepare cyclic system
The drain 62 that system 3 and gypsum dehydration system 4 connect；Drain 62 is connect by drain pump 63 with accident slurry tank 61.
As shown in Figure 1, technique water system 7 is connected to absorption tower 1, sulfur dioxide absorption system 2, lime stone preparation cyclic system
All Water District domains in system 3, gypsum dehydration system 4, desulfurization wastewater treatment system 5 and exhaust system 6；Control system 8 and
Electrical system 9 is connected to absorption tower 1, sulfur dioxide absorption system 2, lime stone the preparation circulatory system 3, gypsum dehydration system
4, all pump housings and valve body in desulfurization wastewater treatment system 5 and exhaust system 6.
Working principle: the SO in hot fume that boiler generates2Removal carried out in absorption tower 1 first, that is, sulfur dioxide
Absorption system 2 prepares the lime stone absorbent slurry that the circulatory system 3 provides by lime stone and is absorbed, while negative according to flue gas
SO in lotus, absorption tower 12Concentration and pH value spray into the limestone slurry liquid measure on absorption tower 1 to control, and reach circulation preparation and utilize
Effect.
It is carried out dehydrating secondly, absorbing the lime stone slurry after flue gas to absorption tower 1 and being delivered to gypsum dehydration system 4,
Slurries after dehydrated form stone solid content paste and waste water, solidfied material are recycled and handle, and waste water is delivered to
Desulfurization wastewater treatment system 5 carries out advanced treating.
Finally, waste water is first delivered to the collection of desulfurization wastewater collecting pit 511, desulfurization wastewater neutralization pond 512 is then flowed through, is passed through
The dispensing of lime milk dosing case 521 neutralizes, and is conducive to the precipitating of heavy metal ion, Ca (OH) in alkaline environment2Addition increase
The pH value of waste water, to make Fe3+、Zn2+、Cu2+、Ni2+、Cr3+Etc. heavy metal ion generate hydroxide precipitating, when pH value reaches
When to 9.0~9.5, most of heavy metal ion have been respectively formed indissoluble hydroxide.Meanwhile the Ca in lime slurry2+It can also be with
F in waste water-Reaction, generates the CaF of indissoluble2；With As3+Complexing generates Ca3(AsO3)2Equal indissolubles substance.After neutralized precipitating
Waste water is delivered to desulfurization wastewater settling tank 513, and medicament is added by clairtan dosing tank 522 and flocculates, is subsequently passed
It in desulfurization wastewater flocculation basin 514 and helps solidifying by flocculation aid dosing tank 523, makes its coacervating large particle and deposit, into one
Step promotes the precipitating of hydroxide and sulfide, so that tiny flocculate is slowly become floccule that is bigger, being easier to deposition, simultaneously
Suspended matter and other impurities in desulfurization wastewater also settle down, desulfurization wastewater settling tank 513 and desulfurization wastewater flocculation basin 514
Under sediment and flocculate deposition be concentrated by gravity concentration at sludge, and by sludge dewatering system 53,；Flocculation
Waste water afterwards enters desulfurization wastewater clarifying basin 515 from 514 overflow of desulfurization wastewater flocculation basin；Pass through organic sulfur compound dosing tank 524
Microorganism in waste water is handled, then is delivered to desulfurization wastewater conditioning tank 516 and is adjusted waste water by hydrochloric acid dosing tank 525
To neutrality；It is finally passed through desulfurization wastewater oxidation pond 517 and is offerd medicine by oxidant dosing tank 526, adjust COD value and pH value, reach
Discharge or circulation comprehensive utilization again after mark.
Flue gas passes sequentially through absorption tower 1, sulfur dioxide absorption system 2, lime stone the preparation circulatory system 3, gypsum dehydration system
System 4, desulfurization wastewater treatment system 5 and exhaust system 6, absorb its flue gas in advance, to the limestone slurry after absorption
Liquid neutralized, flocculated, being precipitated, adjusting processing, make its it is final it is up to standard after, by flue gas, waste water, waste it is up to standard after carry out discharge and
The effect of recycling and reusing not only improves its desulfurization stability, and then improves its desulfuration efficiency, while boiler smoke is effectively reduced
The effect of content of beary metal in gas discharge.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of boiler flue gas desulfurization device, it is characterised in that: absorb system including absorption tower interconnected (1), sulfur dioxide
It unites (2), lime stone prepares the circulatory system (3), gypsum dehydration system (4), desulfurization wastewater treatment system (5) and exhaust system
(6)；The desulfurization wastewater treatment system (5) includes sequentially connected desulfurization wastewater collecting pit (511), desulfurization wastewater neutralization pond
(512), desulfurization wastewater settling tank (513), desulfurization wastewater flocculation basin (514), desulfurization wastewater clarifying basin (515), desulfurization wastewater tune
Section pond (516), desulfurization wastewater oxidation pond (517) and desulfurization wastewater discharge bay (518), the desulfurization wastewater neutralization pond (512),
Desulfurization wastewater settling tank (513), desulfurization wastewater flocculation basin (514), desulfurization wastewater clarifying basin (515), desulfurization wastewater conditioning tank
(516), desulfurization wastewater oxidation pond (517) is connected separately with lime milk dosing case (521), clairtan dosing tank (522), helps
Solidifying agent dosing tank (523), organic sulfur compound dosing tank (524), hydrochloric acid dosing tank (525), oxidant dosing tank (526), it is described
Desulfurization wastewater settling tank (513) and desulfurization wastewater flocculation basin (514) are connected with sludge dewatering system (53).
2. boiler flue gas desulfurization device according to claim 1, it is characterised in that: set respectively on the absorption tower (1)
It is equipped with air inlet (11) and exhaust outlet (12), accident spray water system is provided at the air inlet (11), in the row
Demister (14) and wet scrubber (15) are provided at port (12), air inlet (11) is set under exhaust outlet (12)
Side, demister (14) are set to below wet scrubber (15).
3. boiler flue gas desulfurization device according to claim 1, it is characterised in that: the sulfur dioxide absorption system (2)
Including the spraying layer (21) being set in absorption tower (1), the slurry circulating pump (22) being connect with spraying layer (21) and it is set to
The reaction collecting pit (23) of absorption tower (1) bottom end, the slurry circulating pump (22) connect with the lime stone preparation circulatory system (3).
4. boiler flue gas desulfurization device according to claim 3, it is characterised in that: set in the reaction collecting pit (23)
It is equipped with the first agitating paddle (26).
5. boiler flue gas desulfurization device according to claim 3, it is characterised in that: the spraying layer (21) is provided with more
Layer, and connected between every layer of spraying layer (21) by connection main pipe (213), spraying layer (21) layout design is at uniform fold in absorption
The cross section of tower (1).
6. according to boiler flue gas desulfurization device described in claim 3 or 4 or 5, it is characterised in that: the reaction collecting pit (23)
It is connected with snorkel (251) and emptying pump (252), the snorkel (251) is connected with oxidation fan (253), the discharge
Pump (252) is connect with gypsum dehydration system (4).
7. boiler flue gas desulfurization device according to claim 3, it is characterised in that: the lime stone prepares the circulatory system
(3) the pH value control range of slurries is between 5.2~5.8 in.
8. boiler flue gas desulfurization device according to claim 1, it is characterised in that: the gypsum dehydration system (4) includes
Gypsum slurries baffle-box (41), the gypsum cyclone (42) being connect with gypsum slurries baffle-box (41) and with gypsum cyclone
(42) vacuum hydroextractor (43) connected, is provided with overflow water outlet (44) on the vacuum hydroextractor (43), overflows described
It is provided with filter cloth (45) at the outflow mouth of a river (44), and overflow water outlet (44) is connected with filtrate box (46).
9. boiler flue gas desulfurization device according to claim 1, it is characterised in that: the exhaust system (6) includes and suction
It receives the accident slurry tank (61) of tower (1) connection, prepare what the circulatory system (3) and gypsum dehydration system (4) were connect with lime stone
Drain (62), the drain (62) are connect by drain (62) pump with accident slurry tank (61).
10. boiler flue gas desulfurization device according to claim 1, it is characterised in that: the boiler flue gas desulfurization device is also
Including technique water system (7), control system (8) and electrical system (9), the technique water system (7) respectively with absorption tower (1)
And sulfur dioxide absorption system (2) connection, the control system (8) and electrical system (9) respectively with absorption tower (1), two
Absorption of sulfur oxides system (2), lime stone preparation the circulatory system (3), gypsum dehydration system (4), desulfurization wastewater treatment system (5) with
And exhaust system (6) connection.
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| CN201811045687.5A CN109092043A (en) | 2018-09-07 | 2018-09-07 | boiler flue gas desulfurization device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN111675370A (en) * | 2020-05-13 | 2020-09-18 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Method and device for modifying desulfurization wastewater concentrated solution |
| CN112744946A (en) * | 2020-12-01 | 2021-05-04 | 安徽金禾实业股份有限公司 | Lime wet flue gas desulfurization effluent treatment plant |
| CN113546501A (en) * | 2021-07-08 | 2021-10-26 | 山东竣鸿环保科技有限公司 | High-quality fly ash production system and application thereof |
| CN113797739A (en) * | 2021-11-02 | 2021-12-17 | 福建龙净环保股份有限公司 | Limestone-gypsum method flue gas desulfurization system and limestone-gypsum method flue gas desulfurization method |
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| CN112744946A (en) * | 2020-12-01 | 2021-05-04 | 安徽金禾实业股份有限公司 | Lime wet flue gas desulfurization effluent treatment plant |
| CN113546501A (en) * | 2021-07-08 | 2021-10-26 | 山东竣鸿环保科技有限公司 | High-quality fly ash production system and application thereof |
| CN113797739A (en) * | 2021-11-02 | 2021-12-17 | 福建龙净环保股份有限公司 | Limestone-gypsum method flue gas desulfurization system and limestone-gypsum method flue gas desulfurization method |
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Application publication date: 20181228 |