CN209383589U - A kind of desulfurization wastewater multi-heat source coupled processing system - Google Patents
A kind of desulfurization wastewater multi-heat source coupled processing system Download PDFInfo
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Abstract
The utility model relates to a kind of desulfurization wastewater multi-heat source coupled processing systems, belong to coal-burning power plant waste water treatment field, including are concentrated by evaporation, three medicament neutralization, dry solidification flow elements.90~150 DEG C of low-temperature flue gas is realized under spray washing mode as heat source and is concentrated by evaporation decrement before wherein extracting desulfurizing tower using booster fan in evaporating concentration process；Air preheater is extracted during dry solidification and exports 250~350 DEG C of hot winds as drying source, and using fluidized bed dryer by saliferous slurries rapid draing, the dusty gas after drying enters flue before former plant dust catcher, realizes that solid is collected in deduster.The utility model is using the high-temperature hot-air two media of low-temperature flue gas and air preheater outlet before desulfurizing tower as heat source, pass through the high low-grade heat source of coupling, the solidification of waste water is realized, low energy consumption, the inexpensive dry solidification for realizing desulfurization wastewater solve the problems, such as desulfurization wastewater outlet.
Description
Technical field
The utility model relates to coal-burning power plant wastewater treating technology fields, and in particular to a kind of desulfurization wastewater multi-heat source coupling
Processing system.
Background technique
With the formal execution of new environmental law from January 1st, 2015 and in April, 2015 " water prevention and cure of pollution action meter
Draw " i.e. the promulgation of " ten, water ", China strengthens the management to water pollution, proposes full factory's waste water zero for coal-burning power plant
The requirement of discharge.Currently, the external discharge of wastewater in coal-burning power plant mainly has circulating sewage, precision processing strong brine and wet desulphurization
Waste water, wherein wet desulphurization waste water is the worst one kind of water quality, has with high salt, high TDS, high chloride ion, high suspended matter and by coal
Matter influences the features such as fluctuation, is the key that realize full factory waste water zero discharge process object.
Coal-burning power plant has mainly used for reference the processing of wet desulphurization waste water the technology of salt chemical engineering industry at present, passes through dosing
Softening, film concentration and MVR concentration etc., finally divide salt process using multiple-effect evaporation realization, complete waste water solidification.Such technology is being changed
Industrial and commercial bank applies in coal-burning power plant with a series of problems, such as already through very mature:
(1) softening agent additive amount is big, and use cost is high, and especially in variation water quality, dosing operating cost is mentioned rapidly
It is high；
(2) heat source using the steam of high added value as drying/crystallization, energy consumption is big, and operating cost is high；
(3) it is few that low value-added salt, the terminal processes channels such as sodium chloride are finally generated.
Since there are above-mentioned many problems, the processing cost of desulfurization wastewater is usually at 80~120 yuan/ton at present, to fire coal
Power plant brings heavier financial burden.It is real in consideration of it, developing the desulfurization wastewater curing technology of a kind of low energy consumption, low cost
The task of top priority of existing coal-burning power plant's wastewater treatment.
Utility model content
The utility model aim is to disclose a kind of desulfurization wastewater multi-heat source coupled processing system, solves existing desulfurization and give up
The technical problem that water treatment technology is at high cost, energy consumption is big, end product processing channel is few is arranged using the low temperature of coal-burning power plant
Two kinds of heat sources of flue gas and high-temperature hot-air are put, are matched by efficient coupling, the drying for realizing desulfurization wastewater of low energy consumption, are realized comprehensive
It closes and utilizes, while solving the problems, such as terminal processes.
To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of desulfurization wastewater multi-heat source coupled processing system, including desulfurizing tower, on the air supply duct of the desulfurizing tower front end
Boiler, air preheater, deduster and air-introduced machine, the preceding flue of the desulfurizing tower and the cigarette of air-introduced machine are successively set along flue gas conveying direction
Gas outlet, rear pass connect chimney, it is characterised in that:
It further include being concentrated by evaporation unit, medicament neutralisation unit and dry solidification unit；
The evaporation and concentration unit includes preliminary clarifier and concentration tower, and the liquid inlet of the preliminary clarifier connects desulfurizing tower
Desulfurization wastewater outlet, preliminary clarifier liquid outlet connection concentration tower inlet；The smoke inlet of the concentration tower and de-
The preceding flue of sulphur tower is connected to, by the low-temperature flue gas of flue before booster fan extraction desulfurizing tower as heat source, the flue gas of concentration tower
Outlet is also connected to the preceding flue of desulfurizing tower, and the wet flue gas after cooling returns to flue before desulfurizing tower, concentration tower after demister
The serum outlet of bottom is connected to medicament neutralisation unit by pipeline；
The medicament neutralisation unit includes quenched case and solid-liquid separator, and dosing mouth is set on the quenched case, quenched case
Injection point is connected to the serum outlet of concentration tower, and the serum outlet of quenched case is connected to the injection point of solid-liquid separator；Institute
The bottom for stating solid-liquid separator sets sludge outlet, and centre sets saliferous slurries delivery outlet and is connected to dry solidification unit；
The dry solidification unit includes drying bed, the injection point of the drying bed and the saliferous slurries of solid-liquid separator
Delivery outlet connection, the smoke inlet of the drying bed are connected to the gas vent of air preheater, extract air preheater by booster fan
As drying source, the exhanst gas outlet of the drying bed is connected to high-temperature hot-air in gas vent with the preceding flue of deduster, is done
Dusty gas after dry enters the preceding flue of deduster.
As the optimal technical scheme of the utility model, in the evaporation and concentration unit, extracted from the preceding flue of desulfurizing tower
Low-temperature flue gas temperature be 90~150 DEG C.
Further, in the dry solidification unit, the temperature of the high-temperature hot-air extracted from the gas vent of air preheater is
250~350 DEG C.
Further, the concentration tower is round or rectangular glass-reinforced plastic material tower, 2.0~4.0m/ of gas flow rate in tower
S, the saturation wet flue gas that the wet flue gas of outlet is 50~65 DEG C.
Further, circulating pump is set between the spraying layer of the concentration tower and tower bottom slurry pool, realizes serum recycle spray,
Spraying layer uses hollow cone pressure atomized fog jet, and tower top demister is mechanical demister.
Further, the drying bed uses fluidized bed dryer, and 3~6m/s of gas flow rate in bed exports dusty gas
Temperature be 120~180 DEG C.
Coal-burning power plant uses coal as fuel, burns in boiler furnace, and the high-temperature flue gas of generation passes through furnace water cooling
After the heat-transfer surfaces such as wall, reheater, superheater and economizer, boiler replenishing water is heated to the steam of certain temperature, realizes that energy turns
Change；90~130 DEG C are cooled to by air preheater by 300~400 DEG C of high-temperature flue gas of economizer, recycling heat is for heating
Air is used for coal burning, and the temperature of high-temperature hot-air is usually 250~300 DEG C；The flue gas of air preheater outlet successively passes through dedusting
After device dedusting, wet limestone-gypsum FGD realize gas cleaning, by smoke stack emission.Due to entering the flue gas of wet desulphurization
In need continuously discharge desulfurization wastewater to keep higher desulfuration efficiency containing the various impurity such as dust, HCl, taken off with reduction
Chloride ion, concentration of suspension in sulphur slurries.The utility model has coupled the heat source of the different grades in two kinds of coal-burning power plant, through too low
The serial procedures such as warm evaporation and concentration, slurries neutralization, high temperature and rapid drying realize the powdered form solidification of desulfurization wastewater, last solution
It has determined the emission problem of desulfurization wastewater.Compared with prior art, the utility model has the technical advantages that:
(1) high low-grade two kinds of heat sources are used, realize concentration decrement, then benefit first with 90~130 DEG C of low-temperature flue gas
Waste water dry solidification is realized with a small amount of 250~350 DEG C of high-temperature flue gas, and two-step method realizes the dry solidification of waste water, passes through two
Being coupled for kind heat source, realizes energy-saving.
(2) for desulfurization wastewater after drying, the crystallization water enters flue gas reuse with vapor form；Solid powder after drying
Form is mixed into flyash, realizes comprehensive utilization.
Detailed description of the invention
By made detailed description in conjunction with the following drawings, above-mentioned and/or other aspects and advantage of the utility model will
It becomes more apparent upon and is easier to understand, these attached drawings are only schematical, are not intended to limit the utility model, in which:
Fig. 1 be the utility model relates to desulfurization wastewater multi-heat source coupled processing system process flow diagram.
Appended drawing reference: 1- boiler, 2- air preheater, 3- deduster, 4- air-introduced machine, 5- desulfurizing tower, 6- chimney, 7- presettling
Pond, 8- concentration tower, 9- booster fan, 10- circulating pump, 11- slurry discharge pump, the quenched case of 12-, 13- solid-liquid separator, 14- contain
Salt slurries, 15- drying bed, 16- desulfurization wastewater, 17- low-temperature flue gas, 18- wet flue gas, 19- concentrated slurry, 20- calcium hydroxide, 21-
Sludge, 22- flyash, 23- high-temperature hot-air, 24- dusty gas.
Specific embodiment
Hereinafter, the implementation of the desulfurization wastewater multi-heat source coupled processing system of the utility model is described with reference to the accompanying drawings
Example.
The embodiment recorded herein is the specific specific embodiment of the utility model, for illustrating the utility model
Design, be it is explanatory and illustrative, should not be construed as the limit to the utility model embodiment and the scope of the utility model
System.In addition to the embodiment recorded herein, those skilled in the art can also be public based on the claim of this application book and specification institute
For the content opened using obvious other technical solutions, these technical solutions include using doing to the embodiment recorded herein
The technical solution of any obvious substitutions and modifications out.The attached drawing of this specification is schematic diagram, and it is practical new to aid in illustrating this
The design of type, it is schematically indicated the shape and its correlation of each section.It note that for the ease of clearly showing this reality
With the structure of each component of new embodiment, do not drawn according to identical ratio between each attached drawing.Identical reference marker is used
In the identical part of expression.
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.The utility model efficiently uses the existing heat source of coal-burning power plant, passes through coupling
Two kinds of heat sources of low-temperature flue gas and high-temperature hot-air are closed, the inexpensive dry solidification for realizing desulfurization wastewater solves desulfurization wastewater
The problem of outlet.As shown in Figure 1, the desulfurization wastewater multi-heat source coupled processing system of the utility model, including desulfurizing tower 5, desulfurization
Boiler 1, air preheater 2, deduster 3 and air-introduced machine 4, desulfurizing tower 5 are successively set along flue gas conveying direction on the air supply duct of 5 front end of tower
Preceding flue be connected to the exhanst gas outlet of air-introduced machine 4, rear pass connects chimney 6, further includes being concentrated by evaporation unit, in medicament and single
Member and dry solidification unit；
Being concentrated by evaporation unit includes preliminary clarifier 7 and concentration tower 8, and the liquid inlet connection desulfurizing tower 5 of preliminary clarifier 7 takes off
Sulphur wastewater outlet, the inlet of the liquid outlet connection concentration tower 8 of preliminary clarifier 7；The smoke inlet and desulfurizing tower 5 of concentration tower 8
Preceding flue connection, by booster fan 9 extract desulfurizing tower 5 before flue low-temperature flue gas 17 be used as heat source, the flue gas of concentration tower 8
Outlet is also connected to the preceding flue of desulfurizing tower 5, and the wet flue gas 18 after cooling returns to flue before desulfurizing tower after demister, concentration
The serum outlet of 8 bottom of tower is connected to medicament neutralisation unit by pipeline；Untreated desulfurization wastewater 16 enters preliminary clarifier
Enter concentration tower after clarification, circulated sprinkling is realized by circulating pump, spraying layer；Using booster fan extract desulfurizing tower before 90~
150 DEG C of low-temperature flue gas 17 is used as heat source, realizes under spray washing mode and is concentrated by evaporation decrement, and the wet flue gas 18 after cooling passes through
Flue before desulfurizing tower is returned after crossing demister, forms concentrated slurry 19 after wastewater minimisation 80~90%.It removes using before desulfurizing tower 5
90~130 DEG C of low temperature exhaust heat is concentrated by evaporation, outside recycling waste heat as heat source, realization waste water, and there is also following features:
(1) concentration tower 8 is using round or square glass steel FRP material, 2.0~4.0m/s of gas flow rate in tower, exports and is
50~65 DEG C of temperature of saturation wet flue gas；
(2) realize that slurries spray using circulating pump and spraying layer in concentration tower 8, spraying layer is sprayed using hollow cone pressure atomization
Mouth；
(3) the mechanical demister of 8 top layout of concentration tower reduces wet flue gas 18 and exports drop carrying amount；
(4) concentrated slurry 19 in concentration tower has washed the HCL in flue gas, and canonical parameter is that pH value is 0~2, chloride ion
100~300g/L of concentration, 150~600g/L of salt content, 1050~1300kg/m of density3。
Medicament neutralisation unit includes quenched case 12 and solid-liquid separator 13, and dosing mouth is set on quenched case 12, quenched case 12
Injection point is connected to the serum outlet of concentration tower 8, and the serum outlet of quenched case 12 and the injection point of solid-liquid separator 13 connect
It is logical；The bottom of solid-liquid separator 13 sets sludge outlet, and centre sets saliferous slurries delivery outlet and is connected to dry solidification unit；Using
Calcium hydroxide 20 is used as neutralizer, and the PH of concentrated slurry 19 is neutralized to 7~13 and passes through separation of solid and liquid, solid is in the form of sludge 21
In the presence of saliferous slurries 14 enter subsequent dry solidification unit.This stage, there are following features:
(1) using calcium hydroxide solid powder as neutralizer, the plasm PH value after neutralization is 7~12；
(2) purity of calcium hydroxide powder is not less than 85%；
(3) the sludge solid content 10~60% after being separated by solid-liquid separation；Saliferous slurry solid content 5~30%, density 1050~
1300kg/m3。
Dry solidification unit includes drying bed 15, and the injection point of drying bed 15 and the saliferous slurries of solid-liquid separator 13 are defeated
The smoke inlet of outlet, drying bed 15 is connected to the gas vent of air preheater 2, extracts 2 gas of air preheater by booster fan 9
High-temperature hot-air 23 in body outlet is used as drying source, and the exhanst gas outlet of drying bed 15 is connected to the preceding flue of deduster 3, dry
Dusty gas 24 afterwards enters the preceding flue of deduster 3.This stage drying bed 15 extracts air preheater and exports 250~350 DEG C of hot winds
23 are used as drying source, and using fluidized bed dryer by 14 rapid draing of saliferous slurries, the dusty gas 24 after drying enters former
Flue before plant dust catcher realizes that solid is collected in deduster, uniformly blends with flyash 22, realizes subsequent comprehensive utilization.
Drying bed 15 uses fluidized bed dryer, is typically characterized by 3~6m/s of gas flow rate in bed, outlet temperature 120~180
℃；Solid after slurries are dry exists in the form of powdered form, 5~100 μm of granularity, is all carried along into cigarette before deduster by hot wind
Road.
It is further illustrated below with reference to case study on implementation.
For certain 1000MW coal unit desulfurizing waste water processing device, in conjunction with attached drawing to the working principle of the utility model,
Process and way of realization are described further:
15 ton/hours of present case design rating desulfurization wastewater, wherein waste water solid content 0.5%, pH value 4~6, density
1050kg/m3, 20000~30000mg/L of chlorine ion concentration.
(1) " evaporation and concentration " flow elements:
After untreated desulfurization wastewater enters preliminary clarifier clarification, 8 meters of clarifying basin diameter, 12 meters of height, after clarification
Waste water solid content is reduced to 0.2%, into concentration tower as moisturizing；
One glass reinforced plastic concentration tower is set, and 6.5 meters of tower diameter, tower is interior to arrange two layers spraying layer (mating two circulating pumps), one
Layer demister；360000Nm is extracted by booster fan3/ h flue gas enters concentration tower as evaporation medium, and 110 DEG C of flue-gas temperature,
Flue-gas temperature is reduced to 55 DEG C after waste water spray washing, and wet flue gas returns to flue before desulfurizing tower after passing through demister；
Waste water is reduced 90% after being concentrated by evaporation in concentration tower, 1.5 ton/hours of concentrated slurry flow, pH value 0.2 is close
Spend 1250kg/m3, chlorine ion concentration 295g/L.
(2) " medicament neutralization " flow elements:
Using calcium hydroxide as neutralizer, the PH of concentrated slurry is adjusted to 9~11, the consumption of calcium hydroxide is 10kg/m3
Concentrated slurry, neutral slurry is after being separated by solid-liquid separation, and sludge is delivered to coal yard and mixes burning, and the lower saliferous slurries of solid content are delivered to
" dry solidification " unit.
(3) " dry solidification " flow elements:
Extract 15000Nm3(300 DEG C) of hot Secondary Air of/h are used as drying source, and saliferous slurries are realized in fluidized bed
Rapid draing, flow velocity 3m/s in fluidized bed, 1.6 meters of bed body diameter, 8 meters of height, it is dry after dusty gas temperature be about 150
DEG C, dust content 30g/Nm3。
Dust sauter diameter after drying is 15 μm, is finally mixed into flyash, the mass ratio of Zhan Quan factory flyash
0.6%；Chlorine ion concentration 0.3% in final chemical examination flyash does not influence to sell and downstream comprehensively utilizes.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (6)
1. a kind of desulfurization wastewater multi-heat source coupled processing system, including desulfurizing tower (5), the air supply tube of desulfurizing tower (5) front end
Boiler (1), air preheater (2), deduster (3) and air-introduced machine (4), the desulfurizing tower (5) are successively set along flue gas conveying direction on road
Preceding flue be connected to the exhanst gas outlet of air-introduced machine (4), rear pass connect chimney (6), it is characterised in that:
It further include being concentrated by evaporation unit, medicament neutralisation unit and dry solidification unit；
The evaporation and concentration unit includes preliminary clarifier (7) and concentration tower (8), the liquid inlet connection of the preliminary clarifier (7)
The desulfurization wastewater of desulfurizing tower (5) exports, the inlet of liquid outlet connection concentration tower (8) of preliminary clarifier (7)；The concentration tower
(8) smoke inlet is connected to the preceding flue of desulfurizing tower (5), and the low temperature of flue before desulfurizing tower (5) is extracted by booster fan (9)
Flue gas (17) is used as heat source, and the exhanst gas outlet of concentration tower (8) is also connected to the preceding flue of desulfurizing tower (5), the wet flue gas after cooling
(18) flue, the serum outlet and medicament neutralisation unit of concentration tower (8) bottom pass through pipe before return desulfurizing tower after demister
Road connection；
The medicament neutralisation unit includes quenched case (12) and solid-liquid separator (13), sets dosing mouth on the quenched case (12),
The injection point of quenched case (12) is connected to the serum outlet of concentration tower (8), the serum outlet and separation of solid and liquid of quenched case (12)
The injection point of device (13) is connected to；The bottom of the solid-liquid separator (13) sets sludge outlet, and centre sets the output of saliferous slurries
Mouth is connected to dry solidification unit；
The dry solidification unit includes drying bed (15), injection point and solid-liquid separator (13) of the drying bed (15)
The connection of saliferous slurries delivery outlet, the smoke inlet of the drying bed (15) are connected to the gas vent of air preheater (2), pass through pressurization
Blower (9) extracts the high-temperature hot-air (23) in air preheater (2) gas vent and is used as drying source, the flue gas of the drying bed (15)
Outlet is connected to the preceding flue of deduster (3), and the dusty gas (24) after drying enters the preceding flue of deduster (3).
2. desulfurization wastewater multi-heat source coupled processing system according to claim 1, it is characterised in that: the evaporation and concentration is single
In member, the temperature of the low-temperature flue gas (17) extracted from the preceding flue of desulfurizing tower (5) is 90~150 DEG C.
3. desulfurization wastewater multi-heat source coupled processing system according to claim 1, it is characterised in that: the dry solidification list
In member, the temperature of the high-temperature hot-air (23) extracted from the gas vent of air preheater (2) is 250~350 DEG C.
4. desulfurization wastewater multi-heat source coupled processing system according to claim 1, it is characterised in that: the concentration tower (8)
For round or rectangular glass-reinforced plastic material tower, 2.0~4.0m/s of gas flow rate in tower, the wet flue gas (18) of outlet is 50~65 DEG C
Saturation wet flue gas.
5. desulfurization wastewater multi-heat source coupled processing system according to claim 1, it is characterised in that: the concentration tower (8)
Spraying layer and tower bottom slurry pool between set circulating pump (10), realize serum recycle spray, spraying layer use hollow cone pressure mist
Change nozzle, tower top demister is mechanical demister.
6. desulfurization wastewater multi-heat source coupled processing system described in any one according to claim 1~5, it is characterised in that: institute
It states drying bed (15) and uses fluidized bed dryer, 3~6m/s of gas flow rate in bed, the temperature of outlet dusty gas (24) is 120
~180 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109607907A (en) * | 2018-10-17 | 2019-04-12 | 北京国电龙源环保工程有限公司 | A kind of desulfurization wastewater multi-heat source coupled processing system and processing method |
| CN112607945A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment |
-
2018
- 2018-10-17 CN CN201821681289.8U patent/CN209383589U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109607907A (en) * | 2018-10-17 | 2019-04-12 | 北京国电龙源环保工程有限公司 | A kind of desulfurization wastewater multi-heat source coupled processing system and processing method |
| CN112607945A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment |
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Address after: 100039 room 901, 9 / F, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Patentee after: Guoneng Longyuan environmental protection Co.,Ltd. Address before: 100039 room 911, 1 building, 16 West Fourth Ring Road, Haidian District, Beijing. Patentee before: BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |