CN105060545B - A kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water - Google Patents
A kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water Download PDFInfo
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Abstract
A kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water, the present invention is by setting first order reaction case, one-level depositing reservoir, second order reaction case, two level depositing reservoir, by adding milk of lime, sodium sulphate, bodied ferric sulfate, polyacrylamide into first order reaction case, carry out first order reaction, and by the clarification of one-level depositing reservoir, remove the Mg (OH) after first order reaction in waste water2And CaSO4·2H2O, second order reaction is then carried out in second order reaction case, settled by being passed through flue gas into second order reaction case, and through two level depositing reservoir, make CaCO3Precipitate, complete the sofening treatment to Desulphurization for Coal-fired Power Plant waste water, the system is simple in construction, it is easy to accomplish, it is easy to industrialized production.The present invention (Mg in the case where meeting sofening treatment effect2+≤ 5mg/L, Ca2+≤ 5mg/L), added amount of chemical is reduced, medicament operating cost is reduced, so as to reduce the operating cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system, there is important economic benefit and environmental benefit.
Description
Technical field
The invention belongs to coal-burning power plant waste water zero-discharge technology field, is related to a kind of sofening treatment Desulphurization for Coal-fired Power Plant waste water
System and method.
Background technology
Coal-burning power plant will realize desulfurization wastewater zero-emission, it is necessary to carry out curing process to desulfurization wastewater, curing process is general
Evaporative crystallization technique can be used.Contain the fouling tendency ions such as substantial amounts of calcium, magnesium, general Ca in desulfurization wastewater2+Concentration up to 600~
900mg/L, Mg2+Concentration is up to 3000~5000mg/L.Simultaneously as also exist containing substantial amounts of sulfate ion, in waste water
Calcium sulfate be in hypersaturated state, water quality is unstable, extremely easily evaporation crystallization equipment heat exchange surface formed fouling, greatly
It is big to influence equipment normal operating efficiency.Therefore desulfurization is greatly reduced, it is necessary to soften to desulfurization wastewater before evaporative crystallization
Ca in waste water2+And Mg2+Content, ensure the operation of evaporative crystallization technique normal table.
Desulfurization wastewater zero-emission at present runs the processing that preferable coal-burning power plant is combined using softening with evaporative crystallization
Technique, wherein sofening treatment technique use Dual alkali (lime adds sodium carbonate two-stage sofening treatment), system stable water outlet and water quality
Preferably (Mg2+≤ 5mg/L, Ca2+≤ 5mg/L), make the evaporation crystallization equipment Chemical cleaning cycle longer, and Chemical cleaning expense compared with
It is low, but the medicament operating cost of sofening treatment technique is up to 32.5 yuan/(m3﹒ waste water), medicament operating cost is too high to make the technique
Popularization be greatly limited, therefore the desulfurization wastewater zero-emission engineering construction of coal-burning power plant is also seldom.
To reduce desulfurization wastewater sofening treatment medicament operating cost, a kind of new softening Desulphurization for Coal-fired Power Plant waste water is developed
Technique and the method, (Mg in the case where meeting sofening treatment effect2+≤ 5mg/L, Ca2+≤ 5mg/L), added amount of chemical is reduced,
Operating cost is greatlyd save, there is good development and application prospect.
The content of the invention
To overcome the problems of the prior art, it is an object of the invention to provide a kind of sofening treatment Desulphurization for Coal-fired Power Plant waste water
System and method, (the Mg in the case where meeting sofening treatment effect2+≤ 5mg/L, Ca2+≤ 5mg/L), reduce adding of agent
Amount, medicament operating cost is reduced, so as to reduce the operating cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of system of sofening treatment Desulphurization for Coal-fired Power Plant waste water, including first order reaction case, one-level depositing reservoir, second order reaction
Case, two level depositing reservoir, wherein, one-level depositing reservoir carries water out and sludge outlet with two level depositing reservoir, first order reaction case
Outlet is connected with the entrance of one-level depositing reservoir, and the water out of one-level depositing reservoir is connected with second order reaction tank inlet, and two level is anti-
Case outlet is answered to be connected with two level depositing reservoir entrance.
First order reaction agitator and first order reaction case pH meter are provided with the first order reaction case；In the second order reaction case
It is provided with second order reaction agitator and second order reaction case pH meter.
Intermediate water tank, water out and the centre of one-level depositing reservoir are provided between the one-level depositing reservoir and second order reaction case
The entrance of water tank is connected, and intermediate water tank outlet is connected with the entrance of second order reaction case；Use is provided with the intermediate water tank
In the middle water pump that the water in intermediate water tank is transported to second order reaction case.
Two level clarification feed pump is provided between the second order reaction case outlet and two level depositing reservoir entrance.
Also include filter press, the sludge outlet of one-level depositing reservoir, the sludge outlet of two level depositing reservoir enter with filter press
Mouth is connected, and the water out of filter press is connected with the entrance of first order reaction case.
One-level sludge pump is provided between the sludge outlet and filter press entrance of the one-level depositing reservoir；The two level clarification
Two level sludge pump is provided between the sludge outlet and filter press entrance in pond.
A kind of method of sofening treatment Desulphurization for Coal-fired Power Plant waste water, comprises the following steps：
1) first order reaction is carried out：First, desulfurization wastewater enters first order reaction case, while starts first order reaction agitator,
And to first order reaction case feeding lime breast, sodium sulphate, bodied ferric sulfate, polyacrylamide, adjusted by first order reaction pH meter
The dosage of milk of lime, control ph are 11.0~11.5, and sodium sulphate dosage is 20~30g/L, bodied ferric sulfate dosage
For 20~30mg/L, the dosage of polyacrylamide is 0.5~1mg/L；
2) one-level is clarified：After first order reaction terminates, desulfurization wastewater enters one-level depositing reservoir and clarified, and makes Mg (OH)2
And CaSO4·2H2O is precipitated；
3) second order reaction is carried out：One-level depositing reservoir water outlet flows automatically to intermediate water tank, and second order reaction is transported to through middle water pump
In case, the flue gas that is passed through in second order reaction case after desulfurization, while start second order reaction agitator, by second order reaction pH meter come
Control CO in flue gas2Dosage, control ph be 9.0~10.0；
4) two level is clarified：After second order reaction terminates, waste water is pumped into two level depositing reservoir through two level clarification feedwater and carried out
Clarification, makes CaCO3Precipitation, complete the sofening treatment of Desulphurization for Coal-fired Power Plant waste water.
The body refuse to be precipitated after being clarified in the step 2) is pumped into filter press through one-level spoil disposal and carries out press filtration；It is described
The body refuse to be precipitated after being clarified in step 4) is pumped into filter press through two level spoil disposal carries out press filtration.
The filtrate water of the filter press returns to first order reaction case, mud cake outward transport；The water out row of the two level depositing reservoir
The liquid gone out is evaporated crystallization.
Add polyacrylamide in the step 4) into two level depositing reservoir, and the dosage of polyacrylamide be 1~
2mg/L。
Compared with prior art, the device have the advantages that：
The method that the present invention proposes milk of lime-sodium sulphate-flue gas sofening treatment desulfurization wastewater, during first order reaction, throw
Add the medicaments such as milk of lime, sodium sulphate, bodied ferric sulfate, polyacrylamide, the magnesium ion in desulfurization wastewater is formed magnesium hydroxide
Precipitate, meanwhile, sodium sulphate and calcium hydroxide reaction generation sodium hydroxide；Flue gas is added during second order reaction, is made in flue gas
Carbon dioxide and the sodium hydroxide reaction generation sodium carbonate of first order reaction generation, make the calcium ion in desulfurization wastewater form calcium carbonate
Precipitate；Flue gas is passed through in second order reaction case simultaneously, fully aeration and stripping are carried out to waste water, desulfurization wastewater can be reduced
In ammonia nitrogen, ammonia-nitrogen content in the desulfurization wastewater after softening is less than 10mg/L；It is existing due to using sodium sulphate to replace in this method
There is the sodium carbonate in technology, medicament operating cost can reduce 60% or so than double alkali tenderizers；While wastewater treatment is realized
Solidification utilization is carried out to the carbon dioxide in coal-fired plant flue gas, reduces the discharge of greenhouse gases, is coal-burning power plant's carbon dioxide
Emission reduction provides new development and utilization measure；The present invention is using in waste water after milk of lime, sodium sulphate, flue gas combined sofening treatment
Mg2+≤ 2mg/L, Ca2+≤5mg/L；The present invention (Mg in the case where meeting sofening treatment effect2+≤ 5mg/L, Ca2+≤5mg/
L), added amount of chemical is reduced, medicament operating cost is reduced, so as to reduce the running cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system
With having important economic benefit and environmental benefit.
Further, the sodium sulphate that first order reaction uses, source can be the sodium sulphate in evaporative crystallization mother liquor, can also
It is the sodium sulphate added outside system.Using the sodium sulphate in the sodium sulphate or evaporative crystallization mother liquor added outside system, can drop
Low cost.
The present invention is by setting first order reaction case, one-level depositing reservoir, second order reaction case, two level depositing reservoir, by one-level
The medicaments such as milk of lime, sodium sulphate, bodied ferric sulfate, polyacrylamide are added in reaction chamber, carry out first order reaction, and pass through one-level
After depositing reservoir clarification, the Mg (OH) in desulfurization wastewater is removed2And CaSO4·2H2O, it is anti-that two level is then carried out in second order reaction case
Should, by being passed through flue gas into second order reaction case, second order reaction is carried out, and settled through two level depositing reservoir, make CaCO3It is heavy
Form sediment, complete the processing to Desulphurization for Coal-fired Power Plant waste water, the system is simple in construction, it is easy to accomplish, it is easy to industrialized production.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Wherein, 1- first order reactions case, 2- first order reaction box mixers, 3- first order reaction case pH meters, 4- one-level depositing reservoirs, 5-
Intermediate water tank, 6- middle water pumps, 7- second order reaction casees, 8- second order reaction box mixers, 9- second order reaction case pH meters, 10- two levels
Clarify feed pump, 11- two level depositing reservoirs, 12- one-level sludge pumps, 13- two level sludge pumps, 14- filter presses.
Embodiment
The present invention is described in further detail with reference to example：
Referring to Fig. 1, the present invention includes first order reaction case 1, one-level depositing reservoir 4, intermediate water tank 5, second order reaction case 7 and two level
Depositing reservoir 11, wherein, one-level depositing reservoir 4 carries water out and sludge outlet with two level depositing reservoir 11, and first order reaction case 1 goes out
Mouth is connected with the entrance of one-level depositing reservoir 4, and the water out of one-level depositing reservoir 4 is connected with the entrance of intermediate water tank 5, intermediate water tank
5 outlets are connected with the entrance of second order reaction case 7, and second order reaction case 7 is exported through two level clarification feed pump 10 and two level depositing reservoir 11
Entrance is connected, and the water out of two level depositing reservoir 11 discharges treated water, is evaporated crystallization, one-level depositing reservoir 4 and two
The sludge outlet of level depositing reservoir 11 is used to discharge the body refuse by sedimentation, and the sludge outlet of one-level depositing reservoir 4 is through one-level spoil disposal
Pump 12 is connected with filter press, and the sludge outlet of two level depositing reservoir 11 is connected through two level sludge pump 13 with filter press, from one-level
The body refuse of depositing reservoir 4 and the sludge outlet of two level depositing reservoir 11 returns to first order reaction case 1 through the press filtration of filter press 14, filtrate water,
Mud cake is transported outward.
First order reaction agitator 2 and first order reaction case pH meter 3 are provided with the first order reaction case 1；
Second order reaction agitator 8 and second order reaction case pH meter 9 are provided with the second order reaction case 1；
The middle water pump for the water in intermediate water tank 5 to be transported to second order reaction case 7 is provided with the intermediate water tank 5
6。
A kind of method of sofening treatment Desulphurization for Coal-fired Power Plant waste water, comprises the following steps：
1) first order reaction is carried out：First, desulfurization wastewater enters first order reaction case 1, while starts first order reaction agitator
2, and to medicaments such as first order reaction case feeding lime breast, sodium sulphate, bodied ferric sulfate, polyacrylamides, it is main in first order reaction case
React as follows：
MgSO4+Ca(OH)2→Mg(OH)2↓+CaSO4↓
Na2SO4+Ca(OH)2+2H2O→NaOH+CaSO4·2H2O↓
The dosage of milk of lime is adjusted by first order reaction pH meter 3, pH value general control is 11.0~11.5.Sodium sulphate
Dosage is 20~30g/L, and bodied ferric sulfate dosage is 20~30mg/L, and the dosage of polyacrylamide is 0.5~1mg/
L。
2) one-level is clarified：After first order reaction terminates, desulfurization wastewater enters one-level depositing reservoir 4 and clarified, and makes Mg (OH)2
And CaSO4·2H2O precipitates, and the body refuse to settle down is transported to filter press with one-level sludge pump 11 and carries out press filtration.
3) second order reaction is carried out：The water outlet of one-level depositing reservoir 4 flows automatically to intermediate water tank 5, and it is anti-to be transported to two level through middle water pump 6
Answer in case 7, the flue gas being passed through in second order reaction case 7 after desulfurization, while start second order reaction agitator 8, in second order reaction case
Key reaction is as follows；
2NaOH+CO2→Na2CO3+H2O
Na2CO3+CaSO4→CaCO3↓+Na2SO4
CO in flue gas is controlled by second order reaction pH meter 92Dosage, pH value general control is 9.0~10.0, it is ensured that
CO2It is not excessive.
4) two level is clarified：After second order reaction terminates, waste water is transported in two level depositing reservoir 11 by two level clarification feed pump 10
Clarified, and polyacrylamide is added into two level depositing reservoir 11, and the dosage of polyacrylamide is 1~2mg/L, is made
CaCO3Precipitate, body refuse is transported in filter press with two level sludge pump 13 and carries out press filtration.
The body refuse of one-level depositing reservoir 4, two level depositing reservoir 11, press filtration is carried out into filter press 14, filtrate water returns to one-level
Reaction chamber 1, mud cake outward transport.
The present invention (Mg in the case where meeting sofening treatment effect2+≤ 5mg/L, Ca2+≤ 5mg/L), reduce adding of agent
Amount, medicament operating cost is reduced, so as to reduce the operating cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system, there is important warp
Benefit of helping and environmental benefit.
The present invention mainly has the characteristics that：
1) medicament such as first order reaction feeding lime breast, sodium sulphate, bodied ferric sulfate, polypropylene milling amine, makes in desulfurization wastewater
Magnesium ion form magnesium hydrate precipitate and get off, meanwhile, sodium sulphate and calcium hydroxide reaction generation sodium hydroxide；
2) sodium sulphate that first order reaction uses, source can be sodium sulphate or system in evaporative crystallization mother liquor
The sodium sulphate added outside；
3) second order reaction adds flue gas, generates the carbon dioxide in flue gas and the sodium hydroxide reaction of first order reaction generation
Sodium carbonate, the calcium ion in desulfurization wastewater is formed precipitation of calcium carbonate and get off；
4) method due to the system and method using sodium sulphate instead of sodium carbonate, medicament operating cost is than double alkali tenderizers
60% or so can be reduced；
5) the system and method solidify while wastewater treatment is realized to the carbon dioxide in coal-fired plant flue gas
Utilize, reduce the discharge of greenhouse gases, new development and utilization measure is provided for coal-burning power plant's carbon dioxide discharge-reduction；
6) using the Mg in waste water after milk of lime, sodium sulphate, flue gas combined sofening treatment2+≤ 2mg/L, Ca2+≤5mg/L；
7) flue gas is passed through in second order reaction case simultaneously, fully aeration and stripping is carried out to waste water, desulfurization can be reduced and given up
Ammonia nitrogen in water, ammonia-nitrogen content in the desulfurization wastewater after softening is set to be less than 10mg/L.
Below by an example, the present invention will be described.
Certain coal-fired electric main Analysis Results of Water Quality of desulfurization wastewater is shown in Table 1.
Certain the Desulphurization for Coal-fired Power Plant waste water quality analysis of table 1
Using the method for milk of lime-sodium sulphate of the present invention-flue gas sofening treatment Desulphurization for Coal-fired Power Plant waste water, wherein desulfurization
Waste water is entered in first order reaction case 1, while starts first order reaction agitator 2, in first order reaction case feeding lime breast, sulfuric acid
The medicaments such as sodium, bodied ferric sulfate, polyacrylamide, carry out Chemical Physics reaction, pH value control 11.0~11.5 or so, after reaction
Clarified in into one-level depositing reservoir 4, make the Mg in waste water2+Ion forms Mg (OH)2Precipitate, Mg after one-level softening2+
≤2mg/L.The clear water of one-level depositing reservoir 4 is transported to second order reaction case 7 from being flowed into intermediate water tank 5 by middle water pump 6,
The flue gas after desulfurization is added in second order reaction case 7, is clarified and fed water by two level after pH value control 9.0~10.0 or so, fully reaction
Pump 10 is transported to two level depositing reservoir 11 and clarified, and polyacrylamide, and polyacrylamide are added into two level depositing reservoir 11
Dosage be 1~2mg/L, make the Ca in waste water2+Ion forms CaCO3Precipitate, Ca after secondary softening2+≤5mg/L.One
Level depositing reservoir 4, the body refuse of two level depositing reservoir 11 are pumped into filter press 14 with body refuse and carry out press filtration, and it is anti-that filtrate water returns to one-level
Answer in case 1, mud cake outward transport.
Claims (3)
- A kind of 1. method of sofening treatment Desulphurization for Coal-fired Power Plant waste water, it is characterised in that comprise the following steps：1) first order reaction is carried out：First, desulfurization wastewater enters first order reaction case (1), while starts first order reaction agitator (2), and to first order reaction case feeding lime breast, sodium sulphate, bodied ferric sulfate, polyacrylamide, pass through first order reaction pH meter (3) To adjust the dosage of milk of lime, control ph is 11.0~11.5, and sodium sulphate dosage is 20~30g/L, bodied ferric sulfate Dosage is 20~30mg/L, and the dosage of polyacrylamide is 0.5~1mg/L；2) one-level is clarified：After first order reaction terminates, desulfurization wastewater enters one-level depositing reservoir (4) and clarified, and makes Mg (OH)2With CaSO4·2H2O is precipitated；3) second order reaction is carried out：One-level depositing reservoir (4) water outlet flows automatically to intermediate water tank (5), and two level is transported to through middle water pump (6) In reaction chamber (7), the flue gas after being passed through desulfurization in second order reaction case (7), while start second order reaction agitator (8), pass through Second order reaction pH meter (9) controls CO in flue gas2Dosage, control ph be 9.0~10.0；4) two level is clarified：After second order reaction terminates, waste water is clarified feed pump (10) through two level and is transported in two level depositing reservoir (11) Clarified, make CaCO3Precipitation, complete the sofening treatment of Desulphurization for Coal-fired Power Plant waste water；To adding polyacrylamide in two level depositing reservoir (11) in the step 4), and the dosage of polyacrylamide be 1~ 2mg/L。
- A kind of 2. method of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 1, it is characterised in that the step The body refuse to be precipitated after rapid 2) middle clarification is transported to filter press (14) through one-level sludge pump (12) and carries out press filtration；The step 4) The body refuse to be precipitated after middle clarification is transported to filter press (14) through two level sludge pump (13) and carries out press filtration.
- A kind of 3. method of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 1, it is characterised in that filter press (14) filtrate water returns to first order reaction case (1), mud cake outward transport；The liquid of the water out discharge of the two level depositing reservoir (11) It is evaporated crystallization.
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| CN204752423U (en) * | 2015-07-17 | 2015-11-11 | 西安西热水务环保有限公司 | System for softening coal fired power plant desulfurization waste water |
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