CN205653297U - Desulfurization waste water zero release substep recovery unit - Google Patents
Desulfurization waste water zero release substep recovery unit Download PDFInfo
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- CN205653297U CN205653297U CN201620272191.1U CN201620272191U CN205653297U CN 205653297 U CN205653297 U CN 205653297U CN 201620272191 U CN201620272191 U CN 201620272191U CN 205653297 U CN205653297 U CN 205653297U
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Abstract
The utility model discloses a desulfurization waste water zero release substep recovery unit, soften clarification device, the soft clarification filter equipment of second grade, disk type reverse osmosis unit and crystallization including the one -level of connecting in order and divide the salt device. The one -level is softened clarification device and is included neutralization pond, depositing reservoir and magnetic separator. The second grade softens clarification filter equipment and includes efficient clarifier and rotary disc filter. Retrieval and utilization after disk type reverse osmosis unit's fresh water transport to the log raft sewage reuse system joint disposal that circulates. After the crystallization divided the salt device to pass through disk type reverse osmosis's dense water high temperature evaporation crystallization and retrieve anhydrous sodium sulphate, industry salt was prepared in the medium temperature evaporation crystallization of rethread. The utility model has the advantages of high -efficient, reliable, economy, substep recycle -water and solid useless in the zero release of realization desulfurization waste water, the soft clarification device of second grade retrieves the wet flue gas desulfurization system that calcium carbonate is used for power plant inside, the most genuine realization water and solid zero release and the utilization who gives up promptly.
Description
Technical field
This utility model belongs to wastewater zero discharge field；More particularly, it relates to a kind of desulfurization wastewater zero-emission substep retracting device.
Background technology
Limestone-gypsum flue gas desulfurizing technology is the flue gas desulfurization technique that current range of application is the widest.Limestone, as desulfurization absorbent, makes certain density lime stone slurry with water mix and blend, and in absorption tower, lime stone slurry mixes with smoke contacts, the SO in flue gas2Carrying out chemical reaction with the calcium carbonate in serosity and be removed, be finally oxidized to Gypsum Fibrosum, the flue gas after purification is reclaimed after dehydration by tower top smoke stack emission, desulfurated plaster serosity after removing, by demister, the droplet carried secretly in air-flow.Desulphurization system is in running, and lime stone slurry constantly accumulates Cl-、F-, heavy metal, the harmful substance such as float, need periodically to discharge a part of water and process, prevent from causing serious environmental pollution and device damage.This part water discharged is referred to as desulfurization wastewater.Desulfurization waste water quality is acidity, and salinity is high, and suspension content is high, and hardness is high, and corrosivity is strong, complicated component, and change of water quality is big, unprocessed can not directly discharge, and needs to be separately provided desulfurization wastewater treatment system.
At present, the process technique of desulfurization wastewater mainly comprises the steps that (1) neutralisation treatment: Calx sofening treatment, the pH value of raising waste water, formation hydroxide precipitates；(2) heavy metals removal: there was added machine sulfide in waste water, removes the heavy metal ion that cannot generate hydroxide precipitation further；(3) flocculation treatment: after premenstrual two-step pretreatment, by adding a certain proportion of flocculant and flocculation aid, promotes the precipitation of the floccule of colloid and the formation of other material, accelerates the precipitation of other hydroxide and sulfide simultaneously；(4) clarified separation: the waste water after flocculation enters depositing reservoir and carries out concentrating and separating, and thickened sludge enters sludge treatment equipment and is dehydrated, discharges after clear liquor regulation pH value.Generally, desulfurization wastewater, after above-mentioned PROCESS FOR TREATMENT, mainly reduces the turbidity of waste water, heavy metal and a small amount of hardness, but calcium ion etc. also can remain in waste water, and salinity the most significantly reduces, can't multiplexing.
Along with environmental requirement is improved constantly, desulfurization wastewater is administered extremely the most urgent as the zero-emission of coal-fired power plant's key industry waste water, and develop a kind of reliable, economic, efficient, energy-conservation desulfurization wastewater Zero-discharge treating process, and realize recycling and become emphasis and the difficult point of current field of wastewater.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of desulfurization wastewater zero-emission substep retracting device, there is efficient, reliable, economic dispatch advantage, substep recycle-water and solid waste while realizing desulfurization wastewater zero-emission, i.e. secondary softening clarifier reclaims calcium carbonate for the wet desulfurization system within power plant, the fresh water reuse that DTRO device produces is as the supplementary water of recirculated water, and crystallization point salt device reclaims anhydrous sodium sulfate and Nacl can be as the raw material of chemical industry.Desulfurization wastewater zero-emission substep reclaims (SDC) device and truly realizes water and the zero-emission of solid waste and recycling.
This utility model provides a kind of desulfurization wastewater zero-emission substep retracting device, clarifier is softened including the one-level being sequentially connected with, secondary softening clarification filtration device, disc-type reverse osmosis unit and crystallization point salt device, described one-level softens the neutralization pond that clarifier includes being sequentially connected with, depositing reservoir and magnetic separator, described depositing reservoir connects described secondary softening clarification filtration device, described secondary softening clarification filtration device includes interconnective high-efficiency clarifier and rotary disc filter, described high-efficiency clarifier connects described one-level and softens clarifier, described rotary disc filter connects described disc-type reverse osmosis unit, described crystallization divides salt device to include interconnective high temperature evaporation crystallization apparatus and middle temperature evaporated crystallization device, described high temperature evaporation crystallization apparatus is connected with the dense water end (W.E.) of described disc-type reverse osmosis unit.
Further, high temperature evaporation crystallization apparatus and middle temperature evaporated crystallization device all use vapor recompression flash distillation plant.
This utility model has advantages in that
(1) this utility model one-level softens neutralization and the removal of magnesium of clarification steps feeding lime realization acid in neutralization pond, flocculant, flocculation aid and magnetic powder is added in depositing reservoir, accelerate the precipitate and separate of calcium sulfate, improve secondary softening clarification filtration device and reclaim the purity of sodium carbonate, simultaneously, reduce the dosage of follow-up sodium carbonate, reduce the operating cost softening clarification unit.
(2) this utility model secondary softening clarification filtration device realizes the resource recovery of calcium carbonate while removing the float in waste water, hardness etc. further, and reducing calcium, magnesium etc. to follow-up disc-type reverse osmosis unit and the adverse effect of crystallization point salt device, the calcium carbonate that this step is separated can be back to the wet desulfurization system within power plant.
(3) this utility model realizes the concentration of salinity and the decrement of waste water by disc-type reverse osmosis (DTRO) device, the fresh water reuse produced is as the supplementary water of recirculated water, dense water enters the further evaporation and concentration of evaporation and crystallization system and obtains crystal salt, really realize zero-emission and the resource of desulfurization wastewater, dense water enters crystallization point salt device, produces crystal salt by evaporative crystallization.
Accompanying drawing explanation
Desulfurization wastewater zero-emission that Fig. 1 provides for this utility model and salt making apparatus.
In figure: 1 neutralization pond；2 depositing reservoirs；3 magnetic separators；4 high-efficiency clarifiers；5 rotary disc filters；6 disc-type reverse osmosis units；7 high temperature evaporation crystallization apparatus；8 middle temperature evaporated crystallization devices.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in further detail.
This utility model provides a kind of desulfurization wastewater zero-emission substep retracting device, it is abbreviated as SDC device, its structure softens clarification (Softening clarification), disc-type reverse osmosis (Disk-Tube Reverse as it is shown in figure 1, SDC is core process unit
Osmosis), the combination abbreviation of the initial of the English name of crystallization point salt (Crystal salt).Described desulfurization wastewater has high salinity, high rigidity, high Cl-Deng feature, there is stronger corrosivity and fouling tendency, therefore waste water this utility model before entering disc-type reverse osmosis unit designs it sequentially through one-level softening clarification filtration device, secondary softening clarification filtration device with the float removing in water, hardness, basicity, heavy metal etc., reduces the adverse effect that disc-type reverse osmosis unit and crystallization divide salt device.Described one-level softens neutralization pond 1, depositing reservoir 2 and the magnetic separator 3 that clarifier includes being sequentially connected with, and described secondary softening clarification filtration device includes interconnective high-efficiency clarifier 5 and rotary disc filter 6.After described desulfurization wastewater enters neutralization pond 1, feeding lime realizes neutralization and the removal of magnesium of acid wherein.Neutralization pond 1 is connected with depositing reservoir 2, adds flocculant (PAC), flocculation aid (PAM) and magnetic powder at depositing reservoir 2, removes basicity, Mg2+, heavy metal, fluorine and part SO4 2-Deng composition influential on subsequent technique, the mud (including magnetic powder) that depositing reservoir 2 precipitates then enters magnetic separator 3, realizes the separation of magnetic powder and mud in magnetic separator 3, and magnetic powder recycle and reuse adds in depositing reservoir 2.The supernatant of described depositing reservoir 2 is connected with high-efficiency clarifier 4, adds sodium carbonate and flocculation aid, remove permanent hardness, basicity, float etc. further, it is achieved the recovery of calcium carbonate and recycling in high-efficiency clarifier 4.The supernatant of high-efficiency clarifier 4 is connected with rotary disc filter 5, is connected with disc-type reverse osmosis unit 6, carries out the concentration of salinity and the decrement of waste water through disc-type reverse osmosis unit 6 after rotary disc filter 5 filters.Sodium carbonate, flocculation aid is added, it is achieved reclaim sodium carbonate, can be used for the wet desulfurization system within power plant in described high-efficiency clarifier 4.The fresh water reuse that described disc-type reverse osmosis unit 6 produces is connected with crystallization point salt device as the supplementary water of recirculated water, dense water.Described crystallization divides the high temperature evaporation crystallization apparatus 7 and middle temperature evaporated crystallization device 8 that salt device includes being sequentially connected with.After disc-type reverse osmosis unit 6 dense water out reclaims anhydrous sodium sulfate by high temperature evaporation crystallization apparatus 7, produce Nacl by middle temperature evaporated crystallization device 8 again, and the Recycling Mother Solution of described middle temperature evaporated crystallization device 8 obtains obtaining anhydrous sodium sulfate by evaporative crystallization to high temperature evaporated crystallization device 7 further.Described high temperature evaporation crystallization apparatus 7 and middle temperature evaporated crystallization device 8 all use vapor recompression flash distillation (MVC) device, high temperature evaporation crystallization apparatus 7 controls evaporating temperature at 110 ~ 115 DEG C, and middle temperature evaporated crystallization device 8 controls evaporating temperature at about 60 ~ 70 DEG C.
This utility model reclaims sodium carbonate, Zhong Shui, anhydrous sodium sulfate, Nacl by desulfurization wastewater zero-emission substep retracting device (SDC device) substep, reclaims for material composition substep in desulfurization wastewater, it is achieved water and the recycling of solid waste.
The substep retracting device that this utility model provides, economical and efficient, saving power and preventing pollution contaminates, stable, practical, it is as a kind of desulfurization wastewater zero-emission and salt making apparatus, and one-level secondary softening clarifier is effectively removed the total dissolved solid (TDS) in waste water, hardness, basicity etc., realized recovery and the recycling of sodium carbonate simultaneously.The condensed water producing water and crystallization point salt device of disc-type reverse osmosis unit can realize 100% reuse, without outer row, effectively utilizes water resource, produces anhydrous sodium sulfate and Nacl by high temperature, middle temperature evaporative crystallization sub-prime simultaneously, can reclaim as industrial chemicals.In a word, this processing means well makes up the deficiency in existing desulfurization wastewater zero-discharge technology, truly achieves " zero-emission " target of water and solid waste, realizes the resource of solid waste simultaneously.
Above content is to combine concrete to be preferable to carry out by novel made further description, it is impossible to assert that this utility model is embodied as being confined to these explanations above-mentioned.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple modifications or replacement, all should be considered as protection domain of the present utility model.
Claims (2)
1. a desulfurization wastewater zero-emission substep retracting device, it is characterized in that, clarifier is softened including the one-level being sequentially connected with, secondary softening clarification filtration device, disc-type reverse osmosis unit and crystallization point salt device, described one-level softens the neutralization pond that clarifier includes being sequentially connected with, depositing reservoir and magnetic separator, described depositing reservoir connects described secondary softening clarification filtration device, described secondary softening clarification filtration device includes interconnective high-efficiency clarifier and rotary disc filter, described high-efficiency clarifier connects described one-level and softens clarifier, described rotary disc filter connects described disc-type reverse osmosis unit, described crystallization divides salt device to include interconnective high temperature evaporation crystallization apparatus and middle temperature evaporated crystallization device, described high temperature evaporation crystallization apparatus is connected with the dense water end (W.E.) of described disc-type reverse osmosis unit.
2. according to the desulfurization wastewater zero-emission substep retracting device described in claim 1, it is characterised in that high temperature evaporation crystallization apparatus and middle temperature evaporated crystallization device all use vapor recompression flash distillation plant.
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| CN201620272191.1U CN205653297U (en) | 2016-04-05 | 2016-04-05 | Desulfurization waste water zero release substep recovery unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107522297A (en) * | 2017-09-15 | 2017-12-29 | 北京高能时代环境技术股份有限公司 | A kind of system that desulfurization wastewater softening is carried out using flue gas |
| CN110330165A (en) * | 2019-06-05 | 2019-10-15 | 中国石油天然气集团有限公司 | Strong brine zero-emission and sub-prime crystallizing treatment process and processing system |
-
2016
- 2016-04-05 CN CN201620272191.1U patent/CN205653297U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107522297A (en) * | 2017-09-15 | 2017-12-29 | 北京高能时代环境技术股份有限公司 | A kind of system that desulfurization wastewater softening is carried out using flue gas |
| CN110330165A (en) * | 2019-06-05 | 2019-10-15 | 中国石油天然气集团有限公司 | Strong brine zero-emission and sub-prime crystallizing treatment process and processing system |
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