CN205556350U - Desulfurization waste water zero release processing system - Google Patents

Desulfurization waste water zero release processing system Download PDF

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Publication number
CN205556350U
CN205556350U CN201620117101.1U CN201620117101U CN205556350U CN 205556350 U CN205556350 U CN 205556350U CN 201620117101 U CN201620117101 U CN 201620117101U CN 205556350 U CN205556350 U CN 205556350U
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water
nanofiltration
waste water
depositing reservoir
intercommunication
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CN201620117101.1U
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刘海洋
江澄宇
李叶红
夏爽
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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Abstract

The utility model provides a desulfurization waste water zero release processing system. Include: one removes calcium removes heavy pond, is equipped with first throw prescription unit, with remove the coagulating basin that calcium removed heavy pond intercommunication, be equipped with the second unit of offeing medicine, with a depositing reservoir of coagulating basin intercommunication, with a nanofiltration system of depositing reservoir intercommunication, be equipped with a third offer medicine an unit and a filter between depositing reservoir and the nanofiltration system, nanofiltration system includes an export of the dense water of a sulphate and a villaumite freshwater outlet, export of the dense water of sulphate and flue vaporization system intercommunication, the concentrated system of a villaumite freshwater outlet and membrane intercommunication, the concentrated system of membrane has a concentrated water export and a freshwater outlet, concentrated water export and sodium chloride electrolysis unit intercommunication. The demand that can adapt to the flue evaporation is handled desulfurization waste water to operation and treatment cost reduce by a wide margin.

Description

A kind of desulfurization wastewater zero-discharge treatment system
Technical field
The utility model relates to environmental protection technical field, is specifically related to a kind of desulfurization wastewater zero-discharge treatment system.
Background technology
Most of coal-burning power plant of China have employed Limestone-gypsum Wet Flue Gas Desulfurization Process technology, in order to remove the sulfur dioxide in flue gas.? In process of wet desulphurization, can produce desulfurization wastewater, desulfurization wastewater complicated component, containing high concentration suspended matter, oversaturated sulfurous Hydrochlorate, chlorion, sulfate and various heavy.Desulfurization wastewater mainly uses chemical precipitation method to process at present, part index number Difficulty up to standard, even if after process up to standard, due to sulfate substantial amounts of in waste water and muriatic existence, water outlet salt content is still up to About 3%, it is difficult to recycling, surface water and soil ecology also can be caused after outer row to break, cause secondary pollution.Therefore, desulfurization The exploitation of wastewater zero discharge treatment technology increasingly comes into one's own.
Flue facture is a kind of method that waste water carries out in flue spray evaporation process.Flue evaporation is used to process desulfurization During waste water, spraying in the flue before electric cleaner after being atomized by desulfurization wastewater initially with certain spray regime, waste water is with little The form of drop is evaporated rapidly gasification, suspension therein and soluble solids after high-temperature flue gas heats and is formed tiny solid Grain, then enters electric cleaner under the effect of carrying secretly of air-flow and is caught removal by electrode, to arrange outside dust form, finally realizing The waste water near-zero release of desulfurization processes.
Compared with existing desulfurization wastewater treatment technology, flue evaporation has many merits: equipment is simple, it is not necessary to add chemical drugs Agent, can effectively overcome that existing Waste Water Treatment equipment is many, investment is big, operating cost high and equipment repair and maintenance workload is big Shortcoming;Running simple to operate, the pollutant in waste water is discharged, without sludge treatment problem with ash form-separating;Owing to waste water is to cigarette Introduce in road, smoke moisture can be properly increased, thus reduce the ratio resistance of dust granule in flue gas, be conducive to improving dedusting effect Rate.
But, flue evaporation process there is also following weak point: first, and flue evaporation disposal ability is limited, for some Power plant, is affected by flue gas moisture content, flue-gas temperature, exhaust gas volumn etc., not unfavorable to subsequent technique generations such as dedustings in order to ensure Impact, this technique can only evaporation section waste water;Second, owing to useless impurities in water eventually enters in flyash, may serious shadow Ring the comprehensive utilization of flyash.
Therefore, in order to overcome the disadvantages mentioned above of flue evaporation, it is necessary to develop Novel desulphurization adaptable, that economy is high Wastewater zero emission treatment method.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide a kind of desulfurization wastewater zero-discharge treatment system.Can adapt to flue Desulfurization wastewater is processed by the demand of evaporation, and operation and processing cost are greatly reduced.
For reaching above-mentioned purpose, the concrete technical scheme that the utility model is taked is:
A kind of desulfurization wastewater zero-discharge treatment system, including:
One deliming, except weight pond, is provided with one first dispensing unit;
The coagulating basin connected except weight pond with described deliming, is provided with one second dispensing unit;
The depositing reservoir connected with described coagulating basin;
The nanofiltration system connected with described depositing reservoir;Between described depositing reservoir and nanofiltration system be provided with one the 3rd dispensing unit And a filter;
Described nanofiltration system includes a dense water out of sulfate and a villaumite water outlet, the dense water out of described sulfate and a flue Vapo(u)rization system connects;Described villaumite water outlet and film concentration systems connection;
Described film concentration systems has condensed water outlet and a water outlet, the outlet of described condensed water and monochlor(in)ate sodium electrolysis cells Connection.
Further, described deliming is bucket-shaped except the bottom of weight pond, coagulating basin and depositing reservoir, and described bucket-shaped tip is all communicated to One spoil disposal pipeline.
Further, described deliming removes weight pond and coagulating basin is equipped with a liquid mixing device.
Further, described liquid loads in mixture and is set to agitating device.
Further, described liquid loads in mixture and is set to aerator.
Further, described film concentration systems is in counter-infiltration system, positive osmosis system, electrodialysis system or Membrane Materials system One or more.
By taking technique scheme, waste water, after nanofiltration divides salt treatment, can steam by reduction flue effective, controllable Send out wastewater flow rate, the chlorion total amount that the reduction that simultaneously can control sprays in flue, be conducive to avoiding because flue evaporation process is drawn The flyash chlorinty wide fluctuations risen, and then avoid the comprehensive utilization of flyash is had a negative impact.Additionally, this practicality By controlling adding of agent in novel pretreatment, only carry out except heavily deliming, it is not necessary to demagging, owing to requiring during demagging that wastewater pH controls Higher, while avoiding heavy metal in waste water to enter in flyash, it is to avoid technology for removal of magnesium from phosphorous brings substantial amounts of reagent consumption.To sum up, The utility model has that flow process is simple, added amount of chemical is few, strong adaptability and the low advantage of processing cost.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram of the desulfurization wastewater zero-discharge treatment system in the utility model one embodiment.
Detailed description of the invention
For making features described above of the present utility model and advantage to become apparent, special embodiment below, and coordinate institute's accompanying drawing to make in detail Carefully it is described as follows.
As it is shown in figure 1, in an embodiment, it is provided that a kind of Novel desulphurization Wastewater zero-discharge treatment system, including: deliming is except weight Pond 1, is provided with one first dispensing unit;The coagulating basin 3 connected except weight pond 1 with deliming, is provided with one second dispensing unit;With coagulation The depositing reservoir 5 of pond 3 connection;The nanofiltration system 9 connected with depositing reservoir 5;Being provided with between depositing reservoir 5 and nanofiltration system 9 is true Empty pump 7, the 3rd dispensing unit and filter 8;
Nanofiltration system 9 includes a dense water out of sulfate and a villaumite water outlet, the dense water out of sulfate and flue vapo(u)rization system 10 connections;Villaumite water outlet connects with film concentration systems 11.
Deliming is bucket-shaped except the bottom of weight pond 1, coagulating basin 3 and depositing reservoir 5, and described bucket-shaped tip is all communicated to spoil disposal pipeline 6.
Deliming is equipped with a liquid mixing device except weight pond 1 and coagulating basin 3.In Fig. 1, this liquid mixing device is specially the first agitating device 2 With the second agitating device 4, in some other embodiment, it is also possible to realize liquid by aerator and mix function.
Film concentration systems 11 has condensed water outlet 13 and a water outlet 12, condensed water outlet and sodium chloride electrolysis unit 14 Connection.Sodium chloride electrolysis unit 14 has a basic agent outlet 16 and acid medicine outlet 15 respectively
One or more in counter-infiltration system, positive osmosis system, electrodialysis system or Membrane Materials system of film concentration systems 11. Choose according to different operating modes and actual demand.
Filter 8 main purpose is to remove the suspension in waste water, makes concentration of suspension in waste water meet the water inlet of nanofiltration system 9 Requirement, can be more medium filter, it is also possible to for the filtration system such as ultrafiltration or micro-filtration.
Utilize said system to carry out zero emission treatment of desulfured waste water, comprise the following steps:
First desulfurization wastewater enters deliming and removes weight pond, by medicament addition device to deliming except adding combination medicament A, group in weight pond Conjunction medicament is basic agent, carbonate and organic sulfur, and preferred agents is calcium hydroxide, sodium carbonate and organic sulfur, controls reaction In device, pH is 9~10.5, makes calcium in waste water generate precipitation of calcium carbonate, and the heavy metal such as chromium, zinc, mercury generates corresponding hydroxide Precipitation and sulfide precipitation.Then waste water enters coagulating basin by overflow or pipeline, opens agitating device, is simultaneously introduced combination medicine Agent B, combination medicament B include flocculant and flocculation aid, improve mud-water separation performance by flocculation reaction, remove part COD simultaneously; Calcium concentration in waste water is made to be reduced to 2~40mg/L;
In depositing reservoir, calcium ion concentration controls, and mainly guarantees that nanofiltration system can be properly functioning, can be according to the spirit of subsequent concentration multiple Live and control, it is ensured that economy;
Waste water in coagulating basin enters depositing reservoir by overflow or pipeline, and after mud-water separation, supernatant was entered by water pump Filter, adds certain density medicament C, i.e. hydrochloric acid by pipe-line mixer before entering filter, wastewater pH pulls back to 6~8, Deliming enters spoil disposal pipeline except the mud that weight pond, coagulating basin and depositing reservoir produce, and then thickening processes further;
After waste water is filtered, after then making filtration, in waste water, concentration of suspension meets nanofiltration inflow requirement;Filter water outlet Entering nanofiltration system, the dense water produced after nanofiltration processes mainly contains sulfate radical, inferior sulfate radical, magnesium ion, calcium ion etc., Dense water enters flue vapo(u)rization system and disposes;
The dense water of described nanofiltration system sprays into deduster leading portion flue by high-pressure nozzle, under high-temperature flue gas heats, and the liquid in waste water The impurity such as state water is evaporated to water vapour at short notice, inorganic salts then crystallize formation solid matter, enter follow-up then as flue gas Deduster, the magazine in final waste water is collected with the form of dirt;
The fresh water (solute solution based on sodium chloride) that described nanofiltration system produces enters film concentration systems;
Through film concentration systems process after, the fresh water of generation is back in power plant, according to power-plant flue gas generation amount, constituent, The parameters such as the characteristics such as temperature, fly ash in electric power plant comprehensive utilization situation, and this power plant desulfurization waste water water yield, water quality, determine that film is dense Compression system produces the processing mode of the dense water of sodium chloride;
If described film concentration systems produces dense water passes through flue evaporation process, total utilization of PCA will not be produced impact, then Film concentration systems produces the dense water of dense water and nanofiltration system generation and is combined into the process of flue vapo(u)rization system;
If fly ash in electric power plant comprehensively utilizes, or described film concentration systems produces dense water and passes through flue evaporation process, can be right Total utilization of PCA has a negative impact, then film concentration systems produces dense water and enters sodium chloride electrolysis unit, produces acid (hydrochloric acid) Sell with outside alkali (caustic soda).
As a example by a Practical Project, taking certain power plant desulfurization waste water, desulfurization wastewater initially enters deliming and removes weight pond, by adding hydrogen-oxygen Changing calcium, sodium carbonate and organic sulfur, in control reactor, pH is 9~10.5, makes the heavy metal such as the calcium in waste water and chromium, zinc, mercury Generate corresponding precipitation and remove.Then waste water enters coagulating basin, flocculant and flocculation aid, improves mud-water separation performance, goes simultaneously Except part COD;Make calcium concentration in waste water be reduced to 2~40mg/L, meet subsequent nano-filtration inflow requirement.
Then the waste water in coagulating basin enters depositing reservoir, and after mud-water separation, supernatant is logical enters filter, enters filter Before add certain density hydrochloric acid by pipe-line mixer, wastewater pH is pulled back to 6~8, deliming is except heavy pond, coagulating basin and clear The mud that clear pond produces enters spoil disposal pipeline, and then thickening processes further;After waste water is filtered, waste water enters Nanofiltration system, the dense water that nanofiltration produces after processing enters flue vapo(u)rization system and disposes;(solute is with sodium chloride for the fresh water that nanofiltration produces It is main solution) enter film concentration systems.
After film concentration systems processes, the fresh water of generation is back in power plant, produces dense water and enters sodium chloride electrolysis unit, produces Sell outside raw acid (hydrochloric acid) and alkali (caustic soda).
According to using film concentration technology different, through adjusting, ton water processing cost is about 15-25 unit;Relatively prior art significantly under Fall, and multi-products product water can be with reuse, by increasing capacitance it is possible to increase additional income or reduction respective handling cost, avoid in waste water simultaneously Chlorine total utilization of PCA is had a negative impact.
It should be noted that the utility model, for preferable case study on implementation of the present utility model, is not imposed any restrictions by the above, Every any simple modification, change and equivalent structure change above example made according to the utility model technical spirit, All still fall within the protection domain of technical solutions of the utility model.

Claims (6)

1. a desulfurization wastewater zero-discharge treatment system, it is characterised in that including:
One deliming, except weight pond, is provided with one first dispensing unit;
The coagulating basin connected except weight pond with described deliming, is provided with one second dispensing unit;
The depositing reservoir connected with described coagulating basin;
The nanofiltration system connected with described depositing reservoir;It is provided with one a 3rd dispensing unit and filter between described depositing reservoir and nanofiltration system;
Described nanofiltration system includes a dense water out of sulfate and a villaumite water outlet, the dense water out of described sulfate and flue vapo(u)rization system connection;Described villaumite water outlet and film concentration systems connection;
Described film concentration systems has condensed water outlet and a water outlet, and the outlet of described condensed water connects with monochlor(in)ate sodium electrolysis cells.
2. desulfurization wastewater zero-discharge treatment system as claimed in claim 1, it is characterised in that described deliming is bucket-shaped except the bottom of weight pond, coagulating basin and depositing reservoir, and described bucket-shaped tip is all communicated to a spoil disposal pipeline.
3. desulfurization wastewater zero-discharge treatment system as claimed in claim 1, it is characterised in that described deliming is equipped with a liquid mixing device except weight pond and coagulating basin.
4. desulfurization wastewater zero-discharge treatment system as claimed in claim 3, it is characterised in that described liquid loads in mixture and is set to agitating device.
5. desulfurization wastewater zero-discharge treatment system as claimed in claim 3, it is characterised in that described liquid loads in mixture and is set to aerator.
6. desulfurization wastewater zero-discharge treatment system as claimed in claim 1, it is characterised in that one or more in counter-infiltration system, positive osmosis system, electrodialysis system or Membrane Materials system of described film concentration systems.
CN201620117101.1U 2016-02-05 2016-02-05 Desulfurization waste water zero release processing system Active CN205556350U (en)

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Application Number Priority Date Filing Date Title
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