CN206204082U - Wet desulphurization wastewater zero discharge and resource recovering system - Google Patents
Wet desulphurization wastewater zero discharge and resource recovering system Download PDFInfo
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- CN206204082U CN206204082U CN201621059449.6U CN201621059449U CN206204082U CN 206204082 U CN206204082 U CN 206204082U CN 201621059449 U CN201621059449 U CN 201621059449U CN 206204082 U CN206204082 U CN 206204082U
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Abstract
Desulfurizer is included the utility model discloses a kind of wet desulphurization wastewater zero discharge and resource recovering system, pretreatment unit and salt retracting device is also included；The desulfurizer is connected by waste water conveyance conduit with the reaction tank in the pretreatment unit；The clarified brine that the waste water processed through the pretreatment unit is formed is by salt recovery channel to the salt solution saturator of the salt retracting device；Desulfurizing tower in the desulfurizer is circumscribed with boiler and carrys out flue, and the boiler carrys out flue has branch pipe, and the branch pipe is connected with the salt solution saturator.The waste water produced using pretreatment unit treatment desulfurizer, obtains the clarified brine of soft；Clarified brine is sent into salt retracting device again；The branch pipe is connected with the salt solution saturator, is mixed in salt solution saturator with clarified brine come flue gas using boiler so that clarified brine is concentrated to give magma, and realization carries out recovery Nacl, the zero-emission of desulfurization wastewater, recycling treatment to desulfurization wastewater.
Description
Technical field
Resource, energy recovery the present invention relates to thermal power plant are utilized, energy-conserving and environment-protective technical fiel, more particularly to a kind of
Wet desulphurization wastewater zero discharge and resource recovering system.
Background technology
At present, in China Power energy resource structure, coal electricity accounts for 75%, and is not had in the period of considerably long from now on very big
Change.Coal fired thermal power plant during primary energy coal is converted into secondary energy sources electric power, can produce waste gas, waste water,
The pollutant such as lime-ash and noise, the SO in its waste gas2It is one of major pollutants of air, SO2Discharge cause China's large area
Acid rain harm, in order to reduce air pollution, China has promulgated a series of method of encouragement resource recyclings and energy-saving and emission-reduction
Laws ＆ Regulations, technical standard etc..
In existing flue gas desulfurization technique, Gypsum Wet flue gas washing technique is the most ripe, reliable
Property highest, absorbent aboundresources, be most widely used in the world desulfurization technology, occupation rate of market more than 80% at present.In stone
Because slurries absorb the F in flue gas in lime stone-gypsum wet sweetening process-And Cl-Dissolving, both ions in slurries can be made
Concentration gradually rises, and causes equipment corrosion, desulfuration efficiency decline, gypsum qualitt to decline.In order to maintain system stable operation, ensure
Gypsum product quality and guarantee desulfuration efficiency are, it is necessary to regular discharge part slurries.For 2 × 600 MW units, general desulfurization is given up
Water yield is 15 ~ 20 m3/ h, although total amount is less, because its water-quality constituents is complicated, mainly including suspension, high concentration
Sulphite, sulfate, chloride, fluoride and micro heavy metal ion (Hg, As, Cr, Ni, Pb etc.), to pipeline system
System, equipment have very strong corrosivity, cause the effluent part process and recycle it is extremely difficult, desulfurization wastewater be firepower hair
The maximum waste water of intractability in power plant.
Currently, the requirement of China's wastewater discharge standard is increasingly strict, especially newest promulgation《Water prevention and cure of pollution are taken action
Plan》" ten, water ", has even more risen to national strategy aspect by water environment protection.Thermoelectricity uses water as with water, draining rich and influential family
The 20% of industrial total amount is accounted for, from economical operation and environmental protection, using water wisely improves the recycling rate of waterused of water, realizes thermoelectricity
Factory's desulfurization wastewater " zero-emission " is significant.
To realize desulfurization wastewater " zero-emission ", its core is the treatment of high-concentration salt-containing wastewater.At present, " membrane filtration evaporates
Crystallization " technology is considered as the desulfurization wastewater treatment that comparing is adapted to power plant, and at home and abroad engineering project is invested to build and used.It is former
Manage and be：High-quality water or vapor and solid by desulfurization wastewater are separated into by membrane filtration, evaporation and drying equipment useless
Gurry, realizes the recycling of water.The method can efficiently accomplish Waste Water From Fire Power Plant zero-emission, but, the method lack
Point is investment and the operating cost for needing great number.
Utility model content
Problem to be solved in the utility model is to provide one kind and can carry out recovery Nacl to desulfurization wastewater, realizes desulfurization
The zero-emission of waste water, the wet desulphurization wastewater zero discharge of resource and resource recovering system.
In order to solve the above technical problems, the technical solution adopted in the utility model is：Wet desulphurization wastewater zero discharge and money
Source recovery system includes desulfurizer, also includes pretreatment unit and salt retracting device；The desulfurizer passes through waste water
Conveyance conduit is connected with the reaction tank in the pretreatment unit；The clarification salt that the waste water processed through the pretreatment unit is formed
Water is by salt recovery channel to the salt solution saturator of the salt retracting device；Desulfurizing tower in the desulfurizer is circumscribed with pot
Stove carrys out flue, and the boiler carrys out flue has branch pipe, and the branch pipe is connected with the salt solution saturator.
Early stage desulfurization process are carried out come flue gas to boiler using desulfurizer, the waste water of formation by waste water conveyance conduit with
Reaction tank in the pretreatment unit is connected, the waste water produced using pretreatment unit treatment desulfurizer, obtains soft
Clarified brine；Clarified brine is sent into salt retracting device again, in the above-mentioned technical solutions, boiler carrys out flue has branch
Pipe, the branch pipe is connected with the salt solution saturator, is mixed in salt solution saturator with clarified brine come flue gas using boiler, its
Moisture is taken away by fume afterheat evaporation so that clarified brine is concentrated to give magma, and realization carries out recovery Nacl to desulfurization wastewater,
The zero-emission of desulfurization wastewater, resource are reclaimed.
Further improvement is that the reaction tank is communicated with flocculation basin；Material in the flocculation basin is defeated by pipeline
Deliver in depositing reservoir, the depositing reservoir bottom is connected with sludge delivery pump, the sludge delivery pump is connected with sludge dewatering equipment, institute
State sludge dewatering equipment and be provided with the sludge water feed back pipe for being connected to the depositing reservoir.
Reaction tank is used to make heavy metal ion, Ca in desulfurization wastewater2+、Mg2+Precipitate in solid form；Suspension and precipitation
Thing flocculates in flocculation basin；Sludge delivery pump is used to discharge the body refuse in depositing reservoir；During sludge dewatering equipment is used to remove sludge
Moisture, the moisture of removing is transported in depositing reservoir by sludge water feed back pipe.
Further improvement is have reaction tank agitator in the reaction tank；There is flocculation basin in the flocculation basin
Agitator；Mud scraper is provided with the depositing reservoir.
Further improvement is that the bottom of the salt solution saturator is connected with discharging pump, the discharging pump and Nacl
Dewaterer is connected, and the Nacl dewaterer is additionally provided with return pipe and is connected with the salt solution saturator；The industrial dehydration of salt
Machine lower section is provided with Nacl hopper.
Clarified brine is concentrated to give magma and is delivered to Nacl dewaterer by discharging pump and is dehydrated, and the water of removing passes through
Return pipe is back in salt solution saturator, the magma after dehydration, i.e. Nacl, the industry set by Nacl dewaterer lower section
Salt hopper is sent outside.
Further improvement is that the salt solution saturator is connected with concentration cycles pump.
Further improvement is that the bottom of the desulfurizing tower is connected with gypsum excavationg pump, and the gypsum excavationg pump is successively
Gypsum cyclone, waste water baffle-box and waste-water vortex device are connected with, the waste-water vortex device connects the waste water conveyance conduit.
Desulfurizing tower removes SO to flue gas2The gypsum for being formed afterwards is discharged by gypsum excavationg pump, and gypsum cyclone is used for gypsum
Concentration, moisture enters waste water baffle-box；Waste-water vortex device carries out removal of impurities, thickened solid for the waste water that waste water baffle-box comes
Grain, reduction waste water suspension concentration.
Further improvement is that the bottom of the waste-water vortex device connects belt dewaterer, and the belt dewaterer is also
Communicated with the gypsum cyclone.
The solid obtained after waste-water vortex device removal of impurities connects belt dewaterer by pipeline；Gypsum cyclone is concentrated to gypsum
Solid afterwards is also to be delivered in belt dewaterer.
Further improvement is that the side of the desulfurizing tower is additionally provided with desulfuration recycle pump；In the upper of the desulfurizing tower
End external connection chimney.
Further improvement is to be provided with air exhauster between the branch pipe and the salt solution saturator.
Brief description of the drawings
Further described with implementation method of the present utility model below in conjunction with the accompanying drawings：
Fig. 1 is wet desulphurization wastewater zero discharge of the present utility model and resource recovering system structural representation；
Fig. 2 is wet desulphurization waste water reclaiming process chart；
Wherein：1- desulfurizers；101- desulfurizing towers；102- desulfuration recycle pumps；103- gypsum excavationg pumps；104- gypsum eddy flows
Device；105- belt dewaterers；106- waste water baffle-boxs；107- waste-water vortex devices；108- waste water conveyance conduits；109- boilers carry out cigarette
Feed channel；110- branch pipes；111- chimneys；2- pretreatment units；201- reaction tanks；202- reaction tank agitators；203- flocculation basins；
204- flocculation basin agitators；205- depositing reservoirs；206- mud scrapers；207- sludge delivery pumps；208- sludge dewatering equipments；209- sludge
Bucket；210- salt recovery channels；211- sludge water feed back pipes；3- salt retracting devices；301- air exhausters；302- salt solution saturators；
303- concentration cycles pumps；304- discharging pumps；305- Nacl dewaterers；306- Nacl hoppers；307- return pipes.
Specific embodiment
As shown in figure 1, wet desulphurization wastewater zero discharge of the present utility model and resource recovering system include desulfurizer
1, also include pretreatment unit 2 and salt retracting device 3；The desulfurizer 1 passes through waste water conveyance conduit 108 and the pre- place
Reaction tank 201 in reason device 2 is connected；The clarified brine that the waste water processed through the pretreatment unit 2 is formed is reclaimed by salt
In pipeline 210 to the salt solution saturator 302 of the salt retracting device 3；Desulfurizing tower 101 in the desulfurizer 1 is circumscribed with pot
Stove carrys out flue 109, and the boiler carrys out flue 109 with branch pipe 110, the branch pipe 110 and the salt solution saturator
302 are connected.
The reaction tank 201 is communicated with flocculation basin 203；Material in the flocculation basin 203 is by pipeline to clarification
In pond 205, the bottom of the depositing reservoir 205 is connected with sludge delivery pump 207, and the sludge delivery pump 207 is connected with sludge and takes off
Water dispenser 208, the sludge dewatering equipment 208 is provided with the sludge water feed back pipe 211 for being connected to the depositing reservoir 205, the reaction
There is reaction tank agitator 202 in pond 201；There is flocculation basin agitator 204 in the flocculation basin 203；In the depositing reservoir 205
It is provided with mud scraper 206；The bottom of the salt solution saturator 302 is connected with discharging pump 304, the discharging pump 304 and Nacl
Dewaterer 305 is connected, and the Nacl dewaterer 305 is additionally provided with return pipe 307 and is connected with the salt solution saturator 302；Institute
State the lower section of Nacl dewaterer 305 and be provided with Nacl hopper 306, the side of the salt solution saturator 302 is provided with concentration and follows
Ring pump 303, the bottom of the desulfurizing tower 101 is connected with gypsum excavationg pump 103, and the gypsum excavationg pump 103 is connected with stone in turn
Cream cyclone 104, waste water baffle-box 106 and waste-water vortex device 107, the waste-water vortex device 107 connect the waste water delivery pipe
Road 108, the waste-water vortex device 107 bottom connection belt dewaterer 105, the belt dewaterer 105 also with the gypsum
Cyclone 104 is communicated.
The side of the desulfurizing tower 101 is additionally provided with desulfuration recycle pump 102；Externally connect in the upper end of the desulfurizing tower 101
Cigarette receiving chimney 111, air exhauster 301 is provided between the branch pipe 110 and the salt solution saturator 302.
Specifically, the application method of the above-mentioned wet desulphurization wastewater zero discharge of the utility model and resource recovering system is, such as
Flow chart shown in Fig. 2, arrow is the trend of material, first by the waste water produced with chemical reagent pretreatment desulfurizing device,
Obtain the clarified brine of soft；Boiler smoke evaporation clarified brine is recycled, magma is concentrated to give, finally magma is consolidated
Liquid is separated, and obtains solid industrial salt, and device of the present utility model can effectively divide the heavy metal in desulfurization wastewater, suspension
From the solid industrial salt of recovery can be used for salt industrial, and the moisture in waste water is then used for the humidifying cooling of boiler smoke, the present invention
Suitable for wet desulphurization waste water reclaiming treatment method, realize salt, the recycling of moisture in waste water, reach waste water
The purpose of zero-emission.
Chemical reagent process step includes：The H in active ingredient and waste water in chemical reagent+Neutralization reaction, and with it is de-
Heavy metal ion, Ca in sulphur waste water2+、Mg2+Precipitate in solid form, add flocculant make the suspension generated after reaction and
Sediment flocculation sediment, clarified device obtains sludge and clarified brine.
The effect of preferable desulfurization wastewater softening, removing heavy metals, suspension can be realized by above-mentioned process step.
In salt retracting device, salt separate processing step includes：Using boiler smoke temperature it is high, humidity is low the characteristics of, it is high
Warm flue gas and pretreated brine waste directly contact, complete heat transfer, mass transfer, form saturated flue gas and send desulfurization island removing back to
SO2；Clarified brine obtains concentrate because evaporating moisture, forms the magma of certain solid content；Magma is obtained by separation of solid and liquid
Solid industrial salt.
The moisture evaporating completely in clarified brine can be ensured by above-mentioned salt recycling step, solid industrial salt is obtained, and
And it is high by Nacl quality that above-mentioned steps are obtained, can be used as the raw material of salt chemical engineering.Above-mentioned salt separating step make use of electricity
Factory's boiler exhaust gas waste heat, the moisture of desulfurization wastewater is used for flue gas cool-down humidification, and has reclaimed the salt in waste water.
In the presence of above-mentioned pretreatment unit, the utility model desulfurization wastewater can be realized preferable removing heavy metals,
Reduce desulfurization wastewater hardness, reduce the effect of desulfurization wastewater suspension.
In the presence of salt retracting device, it is ensured that the moisture evaporating completely in clarified brine, solid industrial salt is obtained,
And it is high by Nacl quality that above-mentioned steps are obtained, power plant can be make use of as the raw material of salt chemical engineering, salt recycling step
Boiler exhaust gas waste heat, the moisture of desulfurization wastewater is used for flue gas cool-down humidification, and has reclaimed the salt in waste water.
Compared with prior art, wet desulphurization wastewater zero discharge of the present utility model and resource recovering system can realize with
Lower beneficial effect：
1st, first desulfurization wastewater pre-process obtain by softening, removing heavy metals, suspension clarified brine, recycle
Smoke evaporative concentrating clarifying salt solution obtains magma, is finally separating magma and obtains solid industrial salt.It is of the invention de- suitable for wet method
The method of sulphur waste water reclaiming treatment realizes salt, the recycling of moisture in waste water, reaches the purpose of wastewater zero discharge.
2nd, using flue gas and the clarified brine directly contact being atomized, heat transfer area is big, and heat-transfer effect is good, and takes full advantage of
Boiler exhaust gas waste heat.Offer suitable for the treatment of wet desulphurization waste water reclaiming of the invention realizes salt, moisture waste water
Recycling, reach the purpose of wastewater zero discharge.
3rd, using flue gas and the heat transfer type of liquid directly contact, efficiency high, without large-scale heat transmission equipment, apparatus structure letter
Single, on other systems of coal-burning power plant without influence, new technology is practical, and investment and running cost are low, promote with extensive and
Use value.
General principle of the present utility model, principal character and advantage has been shown and described above.The technical staff of the industry
It should be appreciated that the utility model is not restricted to the described embodiments, the simply explanation described in above-described embodiment and specification is originally
The principle of utility model, on the premise of the utility model spirit and scope are not departed from, the utility model also has various change
And improvement, these changes and improvements are both fallen within the range of claimed the utility model.The utility model claims scope
By appending claims and its equivalent thereof.
Claims (9)
1. a kind of wet desulphurization wastewater zero discharge and resource recovering system, include desulfurizer, it is characterised in that also include
Pretreatment unit and salt retracting device；The desulfurizer is by the reaction tank in waste water conveyance conduit and the pretreatment unit
It is connected；The clarified brine that the waste water processed through the pretreatment unit is formed is by salt recovery channel to the salt retracting device
In salt solution saturator；Desulfurizing tower in the desulfurizer is circumscribed with boiler and carrys out flue, and the boiler carrys out fume pipe stage property
There is branch pipe, the branch pipe is connected with the salt solution saturator.
2. wet desulphurization wastewater zero discharge according to claim 1 and resource recovering system, it is characterised in that the reaction
Pond communicates with flocculation basin；Material in the flocculation basin is by the way that in pipeline to depositing reservoir, the depositing reservoir bottom is connected with
Sludge delivery pump, the sludge delivery pump is connected with sludge dewatering equipment, and the sludge dewatering equipment is provided with and is connected to the clarification
The sludge water feed back pipe in pond.
3. wet desulphurization wastewater zero discharge according to claim 2 and resource recovering system, it is characterised in that the reaction
There is reaction tank agitator in pond；There is flocculation basin agitator in the flocculation basin；Mud scraper is provided with the depositing reservoir.
4. wet desulphurization wastewater zero discharge according to claim 1 and resource recovering system, it is characterised in that the salt solution
The bottom of saturator is connected with discharging pump, and the discharging pump is connected with Nacl dewaterer, and the Nacl dewaterer also sets up
There is return pipe to be connected with the salt solution saturator；The Nacl dewaterer lower section is provided with Nacl hopper.
5. wet desulphurization wastewater zero discharge according to claim 4 and resource recovering system, it is characterised in that the salt solution
Saturator is provided with concentration cycles pump.
6. wet desulphurization wastewater zero discharge according to claim 1 and resource recovering system, it is characterised in that the desulfurization
The bottom of tower is connected with gypsum excavationg pump, and the gypsum excavationg pump is connected with gypsum cyclone, waste water baffle-box and waste water in turn
Cyclone, the waste-water vortex device connects the waste water conveyance conduit.
7. wet desulphurization wastewater zero discharge according to claim 6 and resource recovering system, it is characterised in that the waste water
The bottom connection belt dewaterer of cyclone, the belt dewaterer is also communicated with the gypsum cyclone.
8. wet desulphurization wastewater zero discharge according to claim 7 and resource recovering system, it is characterised in that the desulfurization
Tower is additionally provided with desulfuration recycle pump；In the upper end external connection chimney of the desulfurizing tower.
9. the wet desulphurization wastewater zero discharge and resource recovering system according to claim any one of 1-8, it is characterised in that
Air exhauster is provided between the branch pipe and the salt solution saturator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621059449.6U CN206204082U (en) | 2016-09-18 | 2016-09-18 | Wet desulphurization wastewater zero discharge and resource recovering system |
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|---|---|---|---|
| CN201621059449.6U CN206204082U (en) | 2016-09-18 | 2016-09-18 | Wet desulphurization wastewater zero discharge and resource recovering system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107324371A (en) * | 2017-06-22 | 2017-11-07 | 合肥通用机械研究院 | A kind of centrifugal production technology for separating gypsum |
| CN108339392A (en) * | 2018-04-19 | 2018-07-31 | 福建龙净环保股份有限公司 | Wet desulfurization system and its desulfurizing waste water processing device |
| CN108821484A (en) * | 2018-08-23 | 2018-11-16 | 南京科莱恩环境工程有限公司 | A kind of pretreatment combination size device and method of semi-coke wastewater |
-
2016
- 2016-09-18 CN CN201621059449.6U patent/CN206204082U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107324371A (en) * | 2017-06-22 | 2017-11-07 | 合肥通用机械研究院 | A kind of centrifugal production technology for separating gypsum |
| CN107324371B (en) * | 2017-06-22 | 2018-12-04 | 合肥通用机械研究院有限公司 | A kind of centrifugal production technology separating gypsum |
| CN108339392A (en) * | 2018-04-19 | 2018-07-31 | 福建龙净环保股份有限公司 | Wet desulfurization system and its desulfurizing waste water processing device |
| CN108821484A (en) * | 2018-08-23 | 2018-11-16 | 南京科莱恩环境工程有限公司 | A kind of pretreatment combination size device and method of semi-coke wastewater |
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