CN205347092U - Desulfurization waste water zero release processing system - Google Patents
Desulfurization waste water zero release processing system Download PDFInfo
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- CN205347092U CN205347092U CN201620078432.9U CN201620078432U CN205347092U CN 205347092 U CN205347092 U CN 205347092U CN 201620078432 U CN201620078432 U CN 201620078432U CN 205347092 U CN205347092 U CN 205347092U
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Abstract
The utility model discloses a desulfurization waste water zero release processing system, including one -level treatment by chemical precipitation system (1), second grade treatment by chemical precipitation system, multiple effect evaporation device and the solid -liquid separation equipment who sets gradually, still include the pipeline of introducing the mother liquor in the multiple effect evaporation device one -level treatment by chemical precipitation system (1). The beneficial effects of the utility model are that: reduce the scaling tendency of desulfurization waste water, avoided the scale deposit and influence the emergence that heat transfer, corruption ion pair evaporating chamber heat exchange tube led to the fact phenomenon such as corruption, it for the solution system that naCl gives first place to, utilizes the coal -fired power plant exhaust steam to carry out the concentrated crystallization of multiple -effect vacuum evaporation to desulfurization waste water to change desulfurization waste water into solute simultaneously to produce second grade industrial products salt by -product, realized the zero release of desulfurization waste water.
Description
Technical field
This utility model relates to field technical field of waste water processing, in particular it relates to a kind of desulfurization wastewater zero-discharge treatment system.
Background technology
Coal fired power plant is in wet fuel gas desulfurizing technology process, in order to maintain the balance of desulfurizer serum recycle system, it is necessary to regularly from absorption tower waste discharge, i.e. desulfurization wastewater.It is compared with the industrial wastewater that coal fired power plant is general, and water-quality ratio is more special, and wherein a lot of materials are require the strict first kind pollutant controlled in national environmental standard, are mainly manifested in the following aspects: (1) waste water is faintly acid, and PH is 4 ~ 6；(2) suspension content is high, and granule is little, and main component is Gypsum Fibrosum, secondly also from the calcium carbonate added in the flying dust of flue gas, sweetening process and calcium sulfite etc.；(3) containing the chloride of solubility, fluoride etc. in waste water；(4) containing heavy metal elements such as Pb, Cd, Cr, Ni, Hg, Co, Cu, Al, Zn, Mn in waste water, wherein most is the heavy metal element of restriction in the linear sewage drainage standard of thermal power plant (GB8978-1996).(5) from water quality index, in desulfurization wastewater, chemical oxygen consumption (COC) (COD) is also one of transnormal items.
Current domestic modal method for treating desulfurized wastewater is chemical precipitation method, and the method is to utilize physics, chemical method to remove the most suspended substances in desulfurization wastewater, heavy metal ion etc. by means such as neutralization, sedimentation, flocculate and clarify to make desulfurization wastewater reach the existing discharge standard of country.Waste water after treatment by using the treatment method still contains the Ca being dissolved in waste water2+、Mg2+、Cl-、SO4 2-Etc. the salinity of high concentration, can produce to have a strong impact on to surrounding water if long-time directly discharge is long.
Utility model content
Technical problem to be solved in the utility model is to provide and a kind of desulfurization wastewater carried out multiple-effect vacuum evaporating, concentrating and crystallizing, reclaim moisture and produces industrial goods salt, can be prevented effectively from fouling and desulfurization wastewater zero-discharge treatment system that vaporization chamber heat exchanger tube is impacted by corrosion.
The technical scheme in the invention for solving the above technical problem is:
A kind of desulfurization wastewater zero-discharge treatment system, including set gradually for removing heavy metal ion and F in desulfurization wastewater-The one-level chemical precipitation of ion processes system, passes through to add Na2CO3Solution is to remove the Ca in desulfurization wastewater2+、Mg2+Ion also generates the secondary chemical precipitation process system of NaCl, multi-effect evaporating device and equipment for separating liquid from solid, also includes that the mother solution in multi-effect evaporating device is introduced one-level chemical precipitation and processes the pipeline of system.
This utility model is by adding Na through chemical precipitation method in the waste water after processing2CO3Solution carries out secondary response process, with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduces the Ca in water2+、Mg2+Ion concentration, reduces the fouling tendency of desulfurization wastewater；Desulfurization wastewater is changed into solute to be simultaneously NaCl is main solution system.Desulfurization wastewater after secondary response processes, it being carried out multiple-effect vacuum evaporating, concentrating and crystallizing, makes moisture in desulfurization wastewater separate with salinity, moisture is recycled, and produce to be mainly composed of two grades of industrial goods salt side-products of NaCl, it is achieved the process system of desulfurization wastewater zero-emission.This process system is that the highly purified clear water of main generation is recycled, and produces to be mainly composed of two grades of industrial goods salt side-products of NaCl simultaneously, creates added value.
And in multi-effect evaporating device before the scale-forming ion fouling in mother solution, the partial mother liquid in multi-effect evaporating device introduces one-level chemical precipitation before reaching corrosion heat exchanger tube concentration and processes system by corrosive ions concentration, thus reducing the scale-forming ion of mother solution in multiple-effect evaporation concentration and crystallization device and the concentration of corrosive ions, it is to avoid the generation of fouling and corrosion.
It is the device adopting the traditional chemical sedimentation method to carry out desulfurization wastewater process that one-level chemical precipitation processes system, for legacy equipment, it generally comprises the neutralization case, flow tank, flocculation tanks and the primary-clarifiers that set gradually, desulfurization wastewater enters after neutralizing case, add aqua calcis adjustment pH value in case to neutralizing, make Mg simultaneously2+、Pb2+、Cr3+、Cd2+Plasma is precipitated out with hydroxide form, the F in waste water-Ion is with CaF2Form settles, and neutralizes the waste water completing reaction in case and enters flow tank, and add organic sulfur in flow tank, makes the Pb of remnants2+、Cr3+、Cd2+It is precipitated out with sulphided form etc. heavy metal ion, the waste water completing reaction in flow tank enters flocculation tanks, add flocculant (chloro sulphuric acid ferrum) in flocculation tanks, flocculation aid (PAM) makes precipitate combine sedimentation, through flocculation tanks discharge waste water through primary-clarifiers clarify after, enter secondary chemical precipitation process system.
Described secondary chemical precipitation process system includes the secondary response case, Secondary clarifier and the filter that set gradually.Na is added in secondary response case2CO3Solution is with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduces the Ca in water2+、Mg2+Ion concentration, reduces the fouling tendency of desulfurization wastewater, desulfurization wastewater changes into solute to be simultaneously NaCl be main solution system, enter multi-effect evaporating device after Secondary clarifier and filter remove precipitation.
Described multi-effect evaporating device includes multiple evaporating, concentrating and crystallizing device, and each evaporating, concentrating and crystallizing device is provided with the pipeline that its internal mother solution introduces one-level chemical precipitation process system.The steam of input is utilized repeatedly, the number of times that steam is utilized is called " effect number ", the vapours that adds of first effect is provided by external steam feeding mechanism, preferably, the vapours that adds of first effect is provided by exhaust steam of electric power plant, the indirect steam that previous effect evaporation produces enters next effect evaporating, concentrating and crystallizing device, as next effect evaporating, concentrating and crystallizing device add vapours, by that analogy, steam is repeatedly utilized, the indirect steam that the evaporation of end effect evaporated crystallization device produces is delivered to end effect vapour condensation device and is cooled with circulating water formation vacuum, improves heat transfer temperature difference.Dense salt slurry adopts and turns material mode by effect, and namely first effect concentrated solution proceeds to two effects and again concentrates, and two effect concentrated solutions proceed to next effect, by that analogy.The salt serosity of end effect evaporating, concentrating and crystallizing device enters equipment for separating liquid from solid.Increase and decrease according to system processing power during middle effect evaporating, concentrating and crystallizing device quantitative design.
Described evaporating, concentrating and crystallizing device includes adding hot cell, circulating pump and vaporization chamber, the drain pipe of vaporization chamber connects the water inlet of circulating pump, the discharge outlet of circulating pump connects the water inlet pipe of heater, the drain pipe of heater connects the water inlet pipe of vaporization chamber, liquid in vaporization chamber and heater circulates under the effect of circulating pump, row's steam pipe of vaporization chamber connects the steam input pipe adding hot cell of next effect evaporating, concentrating and crystallizing device, the steam input pipe adding hot cell of first effect evaporating, concentrating and crystallizing device connects SS, the pipeline that the mother solution of previous effect evaporating, concentrating and crystallizing device is introduced next effect evaporating, concentrating and crystallizing device it is provided with between adjacent two-effect evaporation concentration and crystallization device, the mother solution discharge pipe of end effect evaporating, concentrating and crystallizing device connects equipment for separating liquid from solid, the wastewater drainage pipe of secondary chemical precipitation process system is connected with each effect evaporating, concentrating and crystallizing device, wastewater drainage pipe connects the pipeline connecting the drain pipe of vaporization chamber and the water inlet of circulating pump of each effect evaporating, concentrating and crystallizing device.Desulfurization wastewater advection after making secondary response process enters the often effect in multiple-effect evaporation concentration and crystallization device, namely often imitates in vaporization chamber and all enters fresh desulfurization wastewater.
Adding hot cell is heat exchanger structure, adds after the steam input pipe of the heated room of vapours enters and add hot cell, carries out heat exchange with the liquid added in the pipeline of hot cell, be condensed into after condensed fluid and discharge Heat Room.Wastewater mother liquor circulates under the driving of circulating pump in adding hot cell and vaporization chamber.
Desulfurization wastewater in evaporating, concentrating and crystallizing device under forced circulation pumping action forced circulation, desulfurization wastewater advection after the process of secondary chemical precipitation process system sends into each effect evaporating, concentrating and crystallizing device circulation pipe, and after after forced circulation pump raising flow velocity, entrance heating room and steam heat-exchanging heat up, entrance vaporization chamber carries out gas-liquid separation.
Described evaporating, concentrating and crystallizing device adopts forced circulation to improve rate of circulating flow, improves heat transfer coefficient, reduces equipment investment, reduces heat exchanger tube fouling tendency simultaneously.
Preferably, the steam that described multi-effect evaporating device adopts is the exhaust steam that power station produces, namely the head of multi-effect evaporating device imitates the exhaust steam discharge pipe in the steam input pipe connection power station adding hot cell of evaporating, concentrating and crystallizing device, the exhaust steam that power station is sent here is delivered to first effect and is added hot cell desulfurization wastewater is heated, the indirect steam that first effect vaporization chamber produces adds the thermal source in hot cell as next effect, the like.Utilize exhaust steam of electric power plant that the desulfurization wastewater after secondary response processes is carried out multiple-effect vacuum evaporating, concentrating and crystallizing, make moisture in desulfurization wastewater separate with salinity.Thus taking full advantage of the heat energy of exhaust steam of electric power plant, save resource, it is to avoid the waste of heat energy.
Described evaporating, concentrating and crystallizing device also includes condensed water balance bucket, the condensed water discharge pipe adding hot cell connects condensed water balance bucket, add the condensed water inflow level of condensation weighing apparatus bucket that vapours is formed, condensed water balance bucket is provided with flash-off steam discharge pipe, and flash-off steam discharge pipe connects the steam input pipe adding hot cell.
Further, after the drain pipe of the condensed water balance bucket of previous effect evaporating, concentrating and crystallizing device connects, a condensed water imitating evaporating, concentrating and crystallizing device balances bucket, thus a rear effect condensed water balance bucket delivered to by the utilization of condensed water condensed water balance bucket that previous effect evaporating, concentrating and crystallizing device produces after collecting, deliver to next effect condensed water balance bucket after adding, with a rear effect, the condensed water mixing shwoot some vapor that hot cell produces, so circulate.
Preferably, described desulfurization wastewater zero-discharge treatment system also includes a preheater, the discharging tube of secondary chemical precipitation process system is connected with evaporating, concentrating and crystallizing device after connecting this preheater again, the drain pipe of the condensed water balance bucket of end effect evaporating, concentrating and crystallizing device connects condensed water bucket after connecting this preheater by pipeline again, thus desulfurization wastewater secondary chemical precipitation process system discharged by condensed water preheats, condensed water after heat exchange flow to condensed water bucket again and reclaims, thus taking full advantage of the heat energy of condensed water, namely the heat energy adding vapours is taken full advantage of.The condensed water that condensed water bucket is collected can be sent power plant back to and be recycled.
Described equipment for separating liquid from solid includes the thickener and the centrifuge that set gradually, and the liquid discharge tube of thickener and centrifuge connects mother vat, and the discharging tube of mother vat connects multiple-effect evaporation concentration and crystallization device.In multiple-effect evaporation concentration and crystallization device, the salt serosity of output delivers to suspension separation again in thickener, and the salt slurry recycling centrifuge after thickening carries out solid-liquid separation, isolates solid salt and takes out as Nacl, and isolated saline solution returns the interior evaporation of vaporization chamber.
Preferably, the discharging tube of mother vat connects one-level chemical precipitation also by pipeline and processes system, before in mother vat, the scale-forming ion concentration in mother solution reaches fouling concentration or corrosive ions concentration reach corrosion heat exchanger tube concentration before, partial mother liquid in mother vat is introduced one-level chemical precipitation and processes system, thus reducing the ion concentration of mother solution in multiple-effect evaporation concentration and crystallization device, it is to avoid the generation of fouling and corrosion.
Described desulfurization wastewater zero-discharge treatment system also includes end effect vapour condensation device, row's steam pipe of the vaporization chamber of the end effect evaporating, concentrating and crystallizing device of multi-effect evaporating device connects this end effect vapour condensation device, and the condensed water discharging tube of end effect vapour condensation device connects condensed water bucket.Described end effect vapour condensation device is surface condenser, it is preferred that surface condenser is connected to a vacuum pump that it carries out evacuation, for being emptied by fixed gas.
Utilize this utility model, for the desulfurization wastewater of different disposal amount, only need to calculate required heat exchange area, select suitable middle effect quantity to realize in conjunction with investment etc..
Multiple-effect vacuum evaporating, concentrating and crystallizing technology in this multiple-effect evaporation condensing crystallizing system adopts two kinds of inner loop modes to control the concentration of internal system corrosive ion and fouling tendency type ion in limits: 1) arranging multi-effect evaporating device mother liquor reflux pipe processes system to front end one-level chemical precipitation；2) mother liquor reflux that equipment for separating liquid from solid produces processes system to one-level chemical precipitation.
To sum up, the beneficial effects of the utility model are:
1, the salinity solved in the desulfurization wastewater after chemical precipitation method processes directly discharges the problems such as the pollution to surrounding water；Utilize coal fired power plant exhaust steam that desulfurization wastewater is carried out multiple-effect vacuum evaporating, concentrating and crystallizing, make moisture in desulfurization wastewater separate with salinity, reclaim water utilization, and produce to be mainly composed of two grades of industrial goods salt side-products of NaCl, it is achieved the zero-emission of desulfurization wastewater.
Utilize this utility model, for the water yield of the desulfurization wastewater that need to process, in conjunction with the desulfurization wastewater for different disposal amount, only need to calculate required heat exchange area, select suitable middle effect quantity to realize in conjunction with investment etc..
2, before the scale-forming ion fouling in vaporization chamber feed liquid before, corrosive ions concentration reaches corrosion heat exchanger tube concentration, the feed liquid discharging part vaporization chamber processes system to chemical precipitation, it is to avoid the scale-forming ion of high concentration can on the vaporization chamber heat exchanger tube fouling and after affecting heat transfer, enrichment method the corrosive ions of high concentration vaporization chamber heat exchanger tube can be caused the generation of the phenomenons such as corrosion.
3, the indirect steam that evaporation produces is as the vapours that adds of next effect, and steam is repeatedly utilized, and has saved the energy.
4, before in mother vat, the scale-forming ion concentration in mother solution reaches fouling concentration or corrosive ions concentration reach corrosion heat exchanger tube concentration before, partial mother liquid in mother vat is introduced one-level chemical precipitation and processes system, avoid the mother solution with high concentration scale-forming ion and corrosive ions and enter multiple-effect evaporation concentration and crystallization device, it is to avoid the scale-forming ion of high concentration can on the vaporization chamber heat exchanger tube fouling and after affecting heat transfer, enrichment method the corrosive ions of high concentration vaporization chamber heat exchanger tube can be caused the generation of the phenomenons such as corrosion.
5, vaporization chamber form adopts forced-circulation evaporation room, and each effect vaporization chamber is configured with forced circulation pump, strengthens desulfurization wastewater flow velocity in vaporization chamber heat exchanger tube, improves vaporization chamber heat transfer coefficient, reduces equipment investment, reduces salinity fouling probability on heat exchanger tube simultaneously.
6, multi-effect evaporation system feeding manner adopts advection charging, reduces fouling tendency.
7, each salt imitating vaporization chamber output goes to middle effect from head effect, goes to end effect successively, discharges from end effect, reduces and discharges salt slurry temperature, reduces system thermal loss, reduce steam consumption, save the energy.
8, steam condensate (SC) condensed water balances bucket collection, and shwoot goes out some vapor as adding vapours, reduces steam consumption, saves the energy.
9, utilize steam condensate (SC) that desulfurization wastewater is preheated, improve and enter vaporization chamber desulfurization wastewater temperature, reduce steam consumption, save the energy.
10, vacuum pump is set, the incoagulable gas in extraction system, improves end effect vacuum, improves effective heat transfer temperature difference, reduce steam consumption, save the energy.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Labelling and corresponding parts title in accompanying drawing:
1-one-level chemical precipitation processes system, 2-secondary response case, 3-Secondary clarifier, 4-filter, 5-preheater, 6-circulating pump, 7-adds hot cell, 8-vaporization chamber, 9-condensed water balance bucket, 10-thickener, 11-centrifuge, 12-mother vat, 13-surface condenser, 14-condensed water bucket, 15-vacuum pump.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, this utility model is done detailed description further, but embodiment of the present utility model is not limited to this.
Embodiment:
As it is shown in figure 1, a kind of desulfurization wastewater zero-discharge treatment system, including set gradually for removing heavy metal ion and F in desulfurization wastewater-The one-level chemical precipitation of ion processes system 1, passes through to add Na2CO3Solution is to remove the Ca in desulfurization wastewater2+、Mg2+Ion also generates the secondary chemical precipitation process system of NaCl, multi-effect evaporating device and equipment for separating liquid from solid, also includes that the mother solution in multi-effect evaporating device is introduced one-level chemical precipitation and processes the pipeline of system 1.
This utility model is by adding Na through chemical precipitation method in the waste water after processing2CO3Solution carries out secondary response process, with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduces the Ca in water2+、Mg2+Ion concentration, reduces the fouling tendency of desulfurization wastewater；Desulfurization wastewater is changed into solute to be simultaneously NaCl is main solution system.Desulfurization wastewater after secondary response processes, it being carried out multiple-effect vacuum evaporating, concentrating and crystallizing, makes moisture in desulfurization wastewater separate with salinity, moisture is recycled, and produce to be mainly composed of two grades of industrial goods salt side-products of NaCl, it is achieved the process system of desulfurization wastewater zero-emission.This process system is that the highly purified clear water of main generation is recycled, and produces to be mainly composed of two grades of industrial goods salt side-products of NaCl simultaneously, creates added value.
And in multi-effect evaporating device before the scale-forming ion fouling in mother solution, the partial mother liquid in multi-effect evaporating device introduces one-level chemical precipitation before reaching corrosion heat exchanger tube concentration and processes system 1 by corrosive ions concentration, thus reducing the scale-forming ion of mother solution in multiple-effect evaporation concentration and crystallization device and the concentration of corrosive ions, it is to avoid the generation of fouling and corrosion.
It is the device adopting the traditional chemical sedimentation method to carry out desulfurization wastewater process that one-level chemical precipitation processes system 1, for legacy equipment, it generally comprises the neutralization case, flow tank, flocculation tanks and the primary-clarifiers that set gradually, desulfurization wastewater enters after neutralizing case, add aqua calcis adjustment pH value in case to neutralizing, make Mg simultaneously2+、Pb2+、Cr3+、Cd2+Plasma is precipitated out with hydroxide form, the F in waste water-Ion is with CaF2Form settles, and neutralizes the waste water completing reaction in case and enters flow tank, and add organic sulfur in flow tank, makes the Pb of remnants2+、Cr3+、Cd2+It is precipitated out with sulphided form etc. heavy metal ion, the waste water completing reaction in flow tank enters flocculation tanks, add flocculant chloro sulphuric acid ferrum in flocculation tanks, flocculation aid PAM makes precipitate combine sedimentation, through flocculation tanks discharge waste water through primary-clarifiers clarify after, enter secondary chemical precipitation process system.
Described secondary chemical precipitation process system includes the secondary response case 2, Secondary clarifier 3 and the filter 4 that set gradually.Na is added in secondary response case 22CO3Solution is with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduces the Ca in water2+、Mg2+Ion concentration, reduces the fouling tendency of desulfurization wastewater, desulfurization wastewater changes into solute to be simultaneously NaCl be main solution system, enter multi-effect evaporating device after Secondary clarifier 3 and filter 4 remove precipitation.
Described multi-effect evaporating device includes multiple evaporating, concentrating and crystallizing device, and each evaporating, concentrating and crystallizing device is provided with the pipeline that its internal mother solution introduces one-level chemical precipitation process system 1.The steam of input is utilized repeatedly, the number of times that steam is utilized is called " effect number ", the vapours that adds of first effect is provided by external steam feeding mechanism, preferably, the vapours that adds of first effect is provided by exhaust steam of electric power plant, the indirect steam that previous effect evaporation produces enters next effect evaporating, concentrating and crystallizing device, as next effect evaporating, concentrating and crystallizing device add vapours, by that analogy, steam is repeatedly utilized, the indirect steam that the evaporation of end effect evaporated crystallization device produces is delivered to end effect vapour condensation device and is cooled with circulating water formation vacuum, improves heat transfer temperature difference.Dense salt slurry adopts and turns material mode by effect, and namely first effect concentrated solution proceeds to two effects and again concentrates, and two effect concentrated solutions proceed to next effect, by that analogy.The salt serosity of end effect evaporating, concentrating and crystallizing device enters equipment for separating liquid from solid.Increase and decrease according to system processing power during middle effect evaporating, concentrating and crystallizing device quantitative design.
Described evaporating, concentrating and crystallizing device includes adding hot cell 7, circulating pump 6 and vaporization chamber 8, the drain pipe of vaporization chamber 8 connects the water inlet of circulating pump 6, the discharge outlet of circulating pump 6 connects the water inlet pipe of heater, the drain pipe of heater connects the water inlet pipe of vaporization chamber 8, liquid in vaporization chamber 8 and heater circulates under the effect of circulating pump 6, row's steam pipe of vaporization chamber 8 connects the steam input pipe adding hot cell 7 of next effect evaporating, concentrating and crystallizing device, the steam input pipe adding hot cell 7 of first effect evaporating, concentrating and crystallizing device connects SS, the pipeline that the mother solution of previous effect evaporating, concentrating and crystallizing device is introduced next effect evaporating, concentrating and crystallizing device it is provided with between adjacent two-effect evaporation concentration and crystallization device, the mother solution discharge pipe of end effect evaporating, concentrating and crystallizing device connects equipment for separating liquid from solid, the wastewater drainage pipe of secondary chemical precipitation process system is connected with each effect evaporating, concentrating and crystallizing device, wastewater drainage pipe connects the pipeline connecting the drain pipe of vaporization chamber 8 and the water inlet of circulating pump 6 of each effect evaporating, concentrating and crystallizing device, mother solution within evaporating, concentrating and crystallizing device is introduced the water inlet pipe that one-level chemical precipitation processes pipeline one end connection one-level chemical precipitation process system 1 of system 1, the pipeline connecting the drain pipe of vaporization chamber 8 and the water inlet of circulating pump 6 of evaporating, concentrating and crystallizing device, one end connects.Desulfurization wastewater advection after making secondary response process enters the often effect in multiple-effect evaporation concentration and crystallization device, namely often imitates in vaporization chamber 8 and all enters fresh desulfurization wastewater.
Add hot cell 7 for heat exchanger structure, add after the steam input pipe of the heated room 7 of vapours enters and add hot cell 7, carry out heat exchange with the liquid added in the pipeline of hot cell 7, after being condensed into condensed fluid, discharge Heat Room.Wastewater mother liquor circulates under the driving of circulating pump 6 in adding hot cell 7 and vaporization chamber 8.
Desulfurization wastewater in evaporating, concentrating and crystallizing device forced circulation pump 6 act under forced circulation, desulfurization wastewater advection after the process of secondary chemical precipitation process system sends into each effect evaporating, concentrating and crystallizing device circulation pipe, enters vaporization chamber 8 and carry out gas-liquid separation after forced circulation pump 6 improves flow velocity after entering heating room 7 and steam heat-exchanging intensification.
Described evaporating, concentrating and crystallizing device adopts forced circulation to improve rate of circulating flow, improves heat transfer coefficient, reduces equipment investment, reduces heat exchanger tube fouling tendency simultaneously.
Preferably, the steam that described multi-effect evaporating device adopts is the exhaust steam that power station produces, namely the head of multi-effect evaporating device imitates the exhaust steam discharge pipe in the steam input pipe connection power station adding hot cell 7 of evaporating, concentrating and crystallizing device, the exhaust steam that power station is sent here is delivered to first effect and is added hot cell 7 desulfurization wastewater is heated, the indirect steam that first effect vaporization chamber 8 produces adds the thermal source in hot cell 7 as next effect, the like.Utilize exhaust steam of electric power plant that the desulfurization wastewater after secondary response processes is carried out multiple-effect vacuum evaporating, concentrating and crystallizing, make moisture in desulfurization wastewater separate with salinity.Thus taking full advantage of the heat energy of exhaust steam of electric power plant, save resource, it is to avoid the waste of heat energy.
Described evaporating, concentrating and crystallizing device also includes condensed water balance bucket 9, the condensed water discharge pipe adding hot cell 7 connects condensed water balance bucket 9, add the condensed water inflow level of condensation weighing apparatus bucket 9 that vapours is formed, condensed water balance bucket 9 is provided with flash-off steam discharge pipe, and flash-off steam discharge pipe connects the steam input pipe adding hot cell 7.
Further, after the drain pipe of the condensed water balance bucket 9 of previous effect evaporating, concentrating and crystallizing device connects, a condensed water imitating evaporating, concentrating and crystallizing device balances bucket 9, thus a rear effect condensed water balance bucket 9 delivered to by the utilization of condensed water condensed water balance bucket 9 that previous effect evaporating, concentrating and crystallizing device produces after collecting, deliver to next effect condensed water balance bucket 9 after adding, with a rear effect, the condensed water mixing shwoot some vapor that hot cell 7 produces, so circulate.
Preferably, described desulfurization wastewater zero-discharge treatment system also includes a preheater 5, the discharging tube of secondary chemical precipitation process system is connected with evaporating, concentrating and crystallizing device after connecting this preheater 5 again, the drain pipe of the condensed water balance bucket 9 of end effect evaporating, concentrating and crystallizing device connects condensed water bucket 14 after connecting this preheater 5 by pipeline again, thus desulfurization wastewater secondary chemical precipitation process system discharged by condensed water preheats, condensed water after heat exchange flow to condensed water bucket 14 again and reclaims, thus taking full advantage of the heat energy of condensed water, namely the heat energy adding vapours is taken full advantage of.The condensed water that condensed water bucket 14 is collected can be sent power plant back to and be recycled.
Described equipment for separating liquid from solid includes the thickener 10 and the centrifuge 11 that set gradually, and the liquid discharge tube of thickener 10 and centrifuge 11 connects mother vat 12, and the discharging tube of mother vat 12 connects multiple-effect evaporation concentration and crystallization device.In multiple-effect evaporation concentration and crystallization device, the salt serosity of output delivers to suspension separation again in thickener 10, and the salt slurry recycling centrifuge 11 after thickening carries out solid-liquid separation, isolates solid salt and takes out as Nacl, and isolated saline solution returns the interior evaporation of vaporization chamber 8.
Preferably, the discharging tube of mother vat 12 connects one-level chemical precipitation also by pipeline and processes system 1, before in mother vat 12, the scale-forming ion concentration in mother solution reaches fouling concentration or corrosive ions concentration reach corrosion heat exchanger tube concentration before, partial mother liquid in mother vat 12 is introduced one-level chemical precipitation and processes system 1, thus reducing the ion concentration of mother solution in multiple-effect evaporation concentration and crystallization device, it is to avoid the generation of fouling and corrosion.
Described desulfurization wastewater zero-discharge treatment system also includes end effect vapour condensation device, row's steam pipe of the vaporization chamber 8 of the end effect evaporating, concentrating and crystallizing device of multi-effect evaporating device connects this end effect vapour condensation device, and the condensed water discharging tube of end effect vapour condensation device connects condensed water bucket 14.Described end effect vapour condensation device is surface condenser 13, it is preferred that surface condenser 13 is connected to a vacuum pump 15 that it carries out evacuation, for being emptied by fixed gas.
Utilize this utility model, for the desulfurization wastewater of different disposal amount, only need to calculate required heat exchange area, select suitable middle effect quantity to realize in conjunction with investment etc..
Multiple-effect vacuum evaporating, concentrating and crystallizing technology in this multiple-effect evaporation condensing crystallizing system adopts two kinds of inner loop modes to control the concentration of internal system corrosive ion and fouling tendency type ion in limits: 1 arranges multi-effect evaporating device mother liquor reflux pipe processes system 1 to front end one-level chemical precipitation；The mother liquor reflux that 2 equipment for separating liquid from solid produce processes system 1 to one-level chemical precipitation.
Adopt the zero emission treatment of desulfured waste water of described process system, comprise the following steps: desulfurization wastewater processes after system 1 process through one-level chemical precipitation, in desulfurization wastewater, add sodium carbonate react, then desulfurization wastewater is precipitated, send into multi-effect evaporating device after filtration to be evaporated, the steam of evaporation output obtains condensed water after repeatedly heat exchange, the salt slurry of evaporation output enters equipment for separating liquid from solid and carries out solid-liquid separation, obtain solid salt, in multi-effect evaporating device before the scale-forming ion fouling of mother solution, partial mother liquid in multi-effect evaporating device is introduced one-level chemical precipitation process system 1 before reaching corrosion heat exchanger tube concentration and processes by corrosive ions concentration, this partial mother liquid processes system through chemical precipitation and processes, reduce in mother solution after scale-forming ion concentration and corrosive ions concentration, it is again introduced into multi-effect evaporating device to be evaporated.
This utility model is by adding Na through chemical precipitation method in the waste water after processing2CO3Solution carries out secondary response process, with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduces the Ca in water2+、Mg2+Ion concentration, reduces the fouling tendency of desulfurization wastewater；Desulfurization wastewater is changed into solute to be simultaneously NaCl is main solution system.Desulfurization wastewater after secondary response processes, it being carried out multiple-effect vacuum evaporating, concentrating and crystallizing, makes moisture in desulfurization wastewater separate with salinity, moisture is recycled, and produce to be mainly composed of two grades of industrial goods salt side-products of NaCl, it is achieved the process system of desulfurization wastewater zero-emission.This process system is that the highly purified clear water of main generation is recycled, and produces to be mainly composed of two grades of industrial goods salt side-products of NaCl simultaneously, creates added value.In multi-effect evaporating device before the scale-forming ion fouling in mother solution, the partial mother liquid in multi-effect evaporating device introduces one-level chemical precipitation before reaching corrosion heat exchanger tube concentration and processes system 1 by corrosive ions concentration, thus reducing the ion concentration of mother solution in multiple-effect evaporation concentration and crystallization device, it is to avoid the generation of fouling and corrosion.
Further, the step that the mother solution introducing also including solid-liquid separation being obtained is evaporated to multi-effect evaporating device.
Further, be additionally included in the scale-forming ion concentration of the mother solution that solid-liquid separation obtains reach fouling concentration before, before corrosive ions concentration reaches corrosion heat exchanger tube concentration, this mother solution is introduced one-level chemical precipitation and processes system 1 and process.Avoid the mother solution with high concentration scale-forming ion and corrosive ions and enter multiple-effect evaporation concentration and crystallization device, so avoid high concentration scale-forming ion can on vaporization chamber 8 heat exchanger tube fouling and after affecting heat transfer, enrichment method the corrosive ions of high concentration vaporization chamber 8 heat exchanger tube can be caused the generation of the phenomenons such as corrosion.
Further, the step that the desulfurization wastewater before entering multi-effect evaporating device is preheated by the condensed water also including being produced by multi-effect evaporating device.Thus namely scale-forming ion and corrosive ions are removed by desulfurization wastewater before entering multi-effect evaporating device.
Preferably, the exhaust steam that multi-effect evaporating device employing power station is sent here, as adding vapours, utilizes exhaust steam of electric power plant that desulfurization wastewater is carried out multiple-effect vacuum evaporating, concentrating and crystallizing, makes moisture in desulfurization wastewater separate with salinity.Thus taking full advantage of the heat energy of exhaust steam of electric power plant, save resource, it is to avoid the waste of heat energy.
Further, the step that described desulfurization wastewater entrance multi-effect evaporating device is evaporated is:
Desulfurization wastewater advection enters multiple evaporating, concentrating and crystallizing devices of multi-effect evaporating device, the vapours that adds of first effect evaporating, concentrating and crystallizing device is provided by external steam source, the indirect steam that previous effect produces enters next effect evaporating, concentrating and crystallizing device, dense salt slurry adopts and turns material mode, the mother solution improving salinity through previous effect enters next effect evaporating, concentrating and crystallizing device, and the mother solution of end effect evaporating, concentrating and crystallizing device enters equipment for separating liquid from solid.
Further, in each effect evaporating, concentrating and crystallizing device, add the condensed water inflow level of condensation weighing apparatus bucket 9 that vapours is formed, the flash-off steam produced in condensed water balance bucket 9 returns and adds hot cell 7, after the utilization of condensed water condensed water balance bucket 9 that previous effect evaporating, concentrating and crystallizing device produces is delivered to after collecting, one imitates condensed water balance bucket 9, delivers to next effect condensed water and balance bucket 9 after adding, with a rear effect, the condensed water mixing shwoot some vapor that hot cell 7 produces.
Preferably, the desulfurization wastewater before entering multi-effect evaporating device is preheated by the condensed water introducing preheater 5 in the condensed water balance bucket 9 of end effect evaporating, concentrating and crystallizing device.
Further, the steam of the vaporization chamber 8 of last effect evaporating, concentrating and crystallizing device enters vapour condensation device.
Further, described desulfurization wastewater processes, through one-level chemical precipitation, the step existing routine techniques of employing that system 1 processes, and generally comprises the steps: desulfurization wastewater introduces neutralizing case, adds aqua calcis adjustment pH value to neutralizing, make Mg simultaneously in case2+、Pb2+、Cr3+、Cd2+Plasma is precipitated out with hydroxide form, the F in waste water-Ion is with CaF2Form settles, and neutralizes the waste water completing reaction in case and enters flow tank, and add organic sulfur in flow tank, makes the Pb of remnants2+、Cr3+、Cd2+It is precipitated out with sulphided form etc. heavy metal ion, the waste water completing reaction in flow tank enters flocculation tanks, add flocculant chloro sulphuric acid ferrum in flocculation tanks, flocculation aid PAM makes precipitate combine sedimentation, after the clarified device clarification of waste water that flocculation tanks is discharged, complete one-level chemical precipitation process system 1 and process.
Treatment method adopt two kinds of inner loop modes control the concentration of internal system corrosive ion and fouling tendency type ion in limits: 1 arranges multi-effect evaporating device mother liquor reflux pipe processes system to front end chemical precipitation；The mother liquor reflux that 2 equipment for separating liquid from solid produce processes system to chemical precipitation.
As it has been described above, this utility model can be realized preferably.
Claims (10)
1. a desulfurization wastewater zero-discharge treatment system, it is characterized in that, process system (1), secondary chemical precipitation process system, multi-effect evaporating device and equipment for separating liquid from solid including the one-level chemical precipitation set gradually, also include that the mother solution in multi-effect evaporating device is introduced one-level chemical precipitation and process the pipeline of system (1).
2. a kind of desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterised in that described one-level chemical precipitation processes neutralization case, flow tank, flocculation tanks and the primary-clarifiers that system (1) includes setting gradually.
3. a kind of desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterised in that described secondary chemical precipitation process system includes the secondary response case (2), Secondary clarifier (3) and the filter (4) that set gradually.
4. a kind of desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterized in that, described multi-effect evaporating device includes multiple evaporating, concentrating and crystallizing device, each evaporating, concentrating and crystallizing device is provided with the pipeline that its internal mother solution introduces one-level chemical precipitation process system (1), described evaporating, concentrating and crystallizing device includes adding hot cell (7), circulating pump (6) and vaporization chamber (8), the drain pipe of vaporization chamber (8) connects the water inlet of circulating pump (6), the discharge outlet of circulating pump (6) connects the water inlet pipe of heater, the drain pipe of heater connects the water inlet pipe of vaporization chamber (8), row's steam pipe of vaporization chamber (8) connects the steam input pipe adding hot cell (7) of next effect evaporating, concentrating and crystallizing device, the steam input pipe adding hot cell (7) of first effect evaporating, concentrating and crystallizing device connects SS, the pipeline that the mother solution of previous effect evaporating, concentrating and crystallizing device is introduced next effect evaporating, concentrating and crystallizing device it is provided with between adjacent two-effect evaporation concentration and crystallization device, the mother solution discharge pipe of end effect evaporating, concentrating and crystallizing device connects equipment for separating liquid from solid, the wastewater drainage pipe of secondary chemical precipitation process system is connected with each effect evaporating, concentrating and crystallizing device.
5. a kind of desulfurization wastewater zero-discharge treatment system according to claim 4, it is characterised in that the head of described multi-effect evaporating device imitates the exhaust steam discharge pipe in the steam input pipe connection power station adding hot cell (7) of evaporating, concentrating and crystallizing device.
6. a kind of desulfurization wastewater zero-discharge treatment system according to claim 4, it is characterized in that, described evaporating, concentrating and crystallizing device also includes condensed water balance bucket (9), the condensed water discharge pipe adding hot cell (7) connects condensed water balance bucket (9), condensed water balance bucket (9) is provided with flash-off steam discharge pipe, and flash-off steam discharge pipe connects the steam input pipe adding hot cell (7).
7. a kind of desulfurization wastewater zero-discharge treatment system according to claim 6, it is characterized in that, after the drain pipe of condensed water balance bucket (9) of described previous effect evaporating, concentrating and crystallizing device connects, a condensed water imitating evaporating, concentrating and crystallizing device balances bucket (9), described desulfurization wastewater zero-discharge treatment system also includes a preheater (5), the discharging tube of secondary chemical precipitation process system is connected with evaporating, concentrating and crystallizing device after connecting this preheater (5) again, the drain pipe of condensed water balance bucket (9) of end effect evaporating, concentrating and crystallizing device connects condensed water bucket (14) after connecting this preheater (5) by pipeline again.
8. a kind of desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterized in that, described equipment for separating liquid from solid includes the thickener (10) and the centrifuge (11) that set gradually, the liquid discharge tube of thickener (10) and centrifuge (11) connects mother vat (12), and the discharging tube of mother vat (12) connects multiple-effect evaporation concentration and crystallization device.
9. a kind of desulfurization wastewater zero-discharge treatment system according to claim 8, it is characterised in that the discharging tube of described mother vat (12) connects one-level chemical precipitation also by pipeline and processes system (1).
10. a kind of desulfurization wastewater zero-discharge treatment system according to claim 9, it is characterized in that, also include end effect vapour condensation device, row's steam pipe of the vaporization chamber (8) of the end effect evaporating, concentrating and crystallizing device of multi-effect evaporating device connects this end effect vapour condensation device, and the condensed water discharging tube of end effect vapour condensation device connects condensed water bucket (14).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105523677A (en) * | 2016-01-27 | 2016-04-27 | 成都锐思环保技术股份有限公司 | Treatment system capable of realizing zero discharge of desulfurization wastewater |
| CN107739122A (en) * | 2017-10-30 | 2018-02-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | The method that zero-emission recycles thermal power plant desulfurization wastewater |
| CN111003866A (en) * | 2019-12-06 | 2020-04-14 | 安徽晨晰洁净科技有限公司 | Waste salt concentration treatment device |
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2016
- 2016-01-27 CN CN201620078432.9U patent/CN205347092U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105523677A (en) * | 2016-01-27 | 2016-04-27 | 成都锐思环保技术股份有限公司 | Treatment system capable of realizing zero discharge of desulfurization wastewater |
| CN107739122A (en) * | 2017-10-30 | 2018-02-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | The method that zero-emission recycles thermal power plant desulfurization wastewater |
| CN111003866A (en) * | 2019-12-06 | 2020-04-14 | 安徽晨晰洁净科技有限公司 | Waste salt concentration treatment device |
| CN111003866B (en) * | 2019-12-06 | 2024-05-17 | 安徽晨晰洁净科技有限公司 | Waste salt concentration treatment device |
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