CN213506212U - Wastewater hardness removal device and desulfurization wastewater zero-discharge treatment system - Google Patents
Wastewater hardness removal device and desulfurization wastewater zero-discharge treatment system Download PDFInfo
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- CN213506212U CN213506212U CN202021828361.2U CN202021828361U CN213506212U CN 213506212 U CN213506212 U CN 213506212U CN 202021828361 U CN202021828361 U CN 202021828361U CN 213506212 U CN213506212 U CN 213506212U
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Abstract
The utility model discloses a wastewater hardness removal device and a desulfurization wastewater zero-discharge treatment system, wherein the wastewater hardness removal device comprises a closed reaction tank body and a stirrer arranged in the reaction tank body; the reaction tank body is provided with a smoke inlet for accessing low-temperature clean smoke, a liquid inlet for accessing to-be-hardened desulfurization wastewater, a liquid outlet for discharging desulfurization wastewater after hardening is removed, and a smoke outlet for discharging smoke after reaction; a gas-liquid separator is arranged at the smoke outlet. The utility model removes calcium hardness in the wastewater by using carbon dioxide in the flue gas, reduces the cost of softening and adding chemicals, realizes the recycling of the flue gas discharged by a coal-fired power plant or a coal-fired power plant, and reduces the carbon emission; in the desulfurization wastewater zero-discharge treatment system, the desulfurization wastewater is treated by a hard combination chemical precipitation method for removing calcium by carbon dioxide in flue gas, microfiltration and filtration, nanofiltration salt separation and purification and MVR evaporation concentration crystallization treatment to generate recyclable evaporation condensate and sodium chloride crystal salt, so that zero discharge of the desulfurization wastewater is realized.
Description
Technical Field
The utility model relates to a desulfurization waste water treatment technical field especially relates to a waste water removes hard device and desulfurization waste water zero release processing system.
Background
The flue gas of the coal-fired power plant or the coal-fired power plant is subjected to denitration, dust removal and desulfurization treatment and then discharged to the air as clean flue gas, and the carbon dioxide content in the clean flue gas is about 13 percent, so the coal-fired power plant or the coal-fired power plant is one of main sources of urban carbon emission.
The desulfurization waste water generated by the flue gas desulfurization system is used as terminal waste water of a power plant or a power plant, and is a key treatment object for zero discharge of waste water of the coal-fired power plant or the coal-fired power plant. The desulfurization wastewater is high-concentration brine containing calcium sulfate, sodium chloride and other impurity ions, and has the characteristics of high salinity, high hardness and overproof heavy metal content.
At present, the desulfurization wastewater pretreatment usually adopts a chemical precipitation method to remove calcium and magnesium hardness ions, lime or sodium hydroxide, sodium carbonate and other medicaments are added, the lime or the sodium hydroxide reacts with the magnesium ions to generate magnesium hydroxide precipitates so as to remove magnesium hardness, and the sodium carbonate reacts with the calcium ions to generate calcium carbonate precipitates so as to remove calcium hardness. The chemical precipitation method has the defects that the cost of the medicament is high, particularly the cost of sodium carbonate accounts for 70-80% of the total cost of softening and dosing, so that the pretreatment softening cost is high, and further the running cost of a desulfurization wastewater zero-discharge system is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing an utilize hard waste water of carbon dioxide desorption desulfurization waste water calcium in the flue gas to remove hard device and have this waste water and remove the desulfurization waste water zero release processing system of hard device.
The utility model provides a technical scheme that its technical problem adopted is: providing a wastewater hardness removal device for removing calcium hardness in desulfurization wastewater, wherein the wastewater hardness removal device comprises a closed reaction tank body and a stirrer arranged in the reaction tank body;
the reaction tank body is provided with a smoke inlet for accessing low-temperature clean smoke, a liquid inlet for accessing to-be-hardened desulfurization wastewater, a liquid outlet for discharging desulfurization wastewater after hardening removal and a smoke outlet for discharging smoke after reaction; and a gas-liquid separator is arranged at the smoke outlet.
Preferably, the smoke inlet and the liquid outlet are respectively arranged at the lower end of the reaction tank body; the liquid inlet and the smoke outlet are respectively arranged at the upper end of the reaction tank body.
Preferably, the waste water hardness removal device further comprises a flue connected with the smoke inlet and a flue fan arranged on the flue.
Preferably, the wastewater hardness removal device further comprises a drainage pipeline connected with the drainage port, and a delivery pump arranged on the drainage pipeline.
Preferably, the wastewater hardness removal device further comprises a smoke distributor arranged in the reaction tank body;
the smoke distributor comprises an annular smoke through pipe and a connecting pipe connected between the smoke through pipe and the smoke inlet; the smoke through pipe is provided with a plurality of uniformly distributed air distribution holes.
Preferably, the wastewater hardness removal device further comprises a smoke exhaust pipe connected with the smoke exhaust port.
Preferably, the wastewater hardness removal device further comprises a pH detector arranged on the reaction tank body.
The utility model also provides a desulfurization waste water zero release processing system, including the equalizing basin that is used for the homogeneous even volume of desulfurization waste water, be used for advancing the primary reactor that softening treatment removed magnesium hard to desulfurization waste water, a primary clarifier for desulfurization waste water after softening is at wherein clarification processing, get rid of the hard waste water of calcium in the desulfurization waste water after the clarification and remove hard device, a secondary reaction clarifier for getting rid of surplus calcium hard and carrying out clarification processing, carry out the micro-filtration device of filtration treatment to the clarified liquid, carry out the nanofiltration device that divides salt purification processing to the filtrating, carry out the resin apparatus that ion exchange processed to the product water of nanofiltration device, carry out the MVR evaporation plant that evaporative concentration and evaporative crystallization handled to the product water that ion exchange processed the acquisition;
the wastewater hardness removal device is the wastewater hardness removal device in any one of the above modes; the adjusting tank, the first-stage reactor, the first-stage clarifier, the wastewater hardness removal device, the second-stage reaction clarifier, the microfiltration device, the nanofiltration device, the resin device and the MVR evaporation device are sequentially connected.
Preferably, the bottoms of the primary clarifier and the secondary reaction clarifier are respectively connected with a sludge conveying pipeline.
Preferably, a conveying pipeline is arranged on the concentrated water side of the nanofiltration device and connected with the regulating tank, and the concentrated water is conveyed to the regulating tank.
Preferably, the MVR evaporation device comprises an MVR evaporation concentration unit, an MVR evaporation crystallization unit, a dehydration unit and a drying unit which are connected in sequence; the MVR evaporation concentration unit is connected with the resin device.
The waste water hardness removing device of the utility model removes calcium hardness in waste water by using carbon dioxide in flue gas, reduces softening and dosing cost, realizes recycling of flue gas discharged by a coal-fired power plant, and reduces carbon emission of the coal-fired power plant; remove hard device with this waste water and be used for desulfurization waste water zero release processing system, the pretreatment is softened and is adopted in the flue gas carbon dioxide to get rid of calcium and combine chemical precipitation method, micro-filtration and filter, receive and strain salt purification, MVR evaporation concentration crystallization and handle desulfurization waste water, finally produces the evaporation condensate water and the sodium chloride crystal salt that can recycle, realizes desulfurization waste water's zero release.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic structural diagram of a desulfurization wastewater zero-discharge treatment system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wastewater hardness removal device according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the desulfurization wastewater zero-discharge treatment system of an embodiment of the present invention includes a regulating reservoir 10, a first-stage reactor 20, a first-stage clarifier 30, a wastewater hardness removal device 40, a second-stage reaction clarifier 50, a microfiltration device 60, a nanofiltration device 70, a resin device 80, and an MVR evaporation device 90, which are connected in sequence.
The adjusting tank 10 is used for carrying out homogenization and quantity equalization pretreatment on the desulfurization wastewater, and the pretreated desulfurization wastewater is uniform in solid and liquid and then is conveyed to the primary reactor 20 through a pipeline. The primary reactor 20 is used for softening the desulfurization wastewater to remove magnesium hardness and heavy metal ions and the like, and the softened desulfurization wastewater is conveyed from the primary reactor 20 to the primary clarifier 30 through a pipeline. The primary clarifier 30 is used for clarifying the softened desulfurization wastewater therein to obtain a clarified liquid, and the clarified liquid is conveyed to the wastewater hardness removal device 40 through a pipeline. The wastewater hardness removing device 40 removes calcium hardness in the clarified liquid by using carbon dioxide in the flue gas, and the desulfurized wastewater after the hardness removal treatment is conveyed to the secondary reaction clarifier 50 through a pipeline. The secondary reaction clarifier 50 is used for removing residual calcium hardness in the desulfurization wastewater, and also performs clarification treatment, and the obtained clarified liquid is conveyed to a microfiltration device 60. The microfiltration device 60 performs a filtration process on the clarified liquid to remove suspended substances and the like therein, and the filtrate is sent to the nanofiltration device 70. The nanofiltration device 70 carries out salt separation and purification treatment on the filtrate, and improves the purity of the produced water sodium chloride. The resin device 80 performs ion exchange treatment on the produced water of the nanofiltration device 70 to remove residual hardness, thereby playing a role in guaranteeing the quality of the effluent water. The MVR evaporation device 90 carries out evaporation concentration and evaporation crystallization treatment on the produced water obtained by the ion exchange treatment, and finally sodium chloride crystal salt and evaporation condensed water are obtained.
The conditioning tank 10 may include a tank body 11 and an agitator 12 disposed within the tank body 11. The tank body 11 receives desulfurization wastewater from a power plant, and the stirrer 12 stirs the desulfurization wastewater in the tank body 11, so that the desulfurization wastewater is uniform in solid and liquid and is not easy to settle.
The first-stage reactor 20 is used for softening and removing magnesium and hard in the desulfurization wastewater, and mainly removes magnesium and hard heavy metal ions and the like by adding lime, organic sulfur, coagulant aid and coagulant into the desulfurization wastewater, so that the concentration of magnesium ions in the effluent of the first-stage reactor 20 is controlled to be less than 10mg/l, and the pH value is controlled to be more than 11.
The primary clarifier 30 receives the effluent from the primary reactor 20, and clarifies the effluent therein, and the clarified liquid is then conveyed to a wastewater hardness removal device 40. In this embodiment, a mud scraper is provided in the primary clarifier 30 for scraping off the sludge deposited in the primary clarifier 30. The bottom of the mud scraper is conical, which is beneficial to discharging mud. Further, a sludge conveying pipeline is connected to the bottom of the primary clarifier 30 for discharging sludge, and is connected to the sludge dewatering treatment system through the sludge conveying pipeline, and the discharged sludge is sent to the sludge dewatering treatment system for dewatering treatment.
The wastewater hardness removal device 40 receives the clarified liquid from the primary clarifier 30, and uses carbon dioxide in the flue gas to perform hardness removal treatment on the clarified liquid.
Specifically, as shown in fig. 2, the wastewater hardness removal device 40 includes a closed reaction tank 41 and a stirrer 42 provided in the reaction tank 41. The reaction tank 41 is provided with a smoke inlet 411 for receiving low-temperature clean smoke, a liquid inlet 412 for receiving desulfurization waste water (i.e. clarified liquid) to be subjected to hardness removal, a liquid outlet 412 for discharging desulfurization waste water after hardness removal, and a smoke outlet 414 for discharging smoke after reaction.
The low-temperature clean flue gas is clean flue gas (free of other impurities affecting the hardness removal reaction) with the temperature lower than 80 ℃ and the carbon dioxide content higher than 10%. The low-temperature clean flue gas is preferably tail-end low-temperature clean flue gas which is subjected to denitration, dust removal, desulfurization and wet-type electric precipitation treatment in a coal-fired power plant or a coal-fired power plant, and the flue gas of the coal-fired power plant or the coal-fired power plant is recycled. The clarified liquid (pH > 11) output from the primary clarifier 30 enters the reaction tank 41 through the liquid inlet 412, and the carbon dioxide in the low-temperature clean flue gas is dissolved into the clarified liquid under the stirring action of the stirrer 42, so that the carbon dioxide and the clarified liquid react (the pH is kept between 8.0 and 8.5), calcium carbonate precipitates are generated, and calcium hardness of the clarified liquid is removed. The clarified liquid after the calcium hardness removal is conveyed to the secondary reaction clarifier 50 through a liquid outlet 412, and the clean flue gas after the reaction is discharged out of the reaction tank body 41 through a smoke outlet 414. And a gas-liquid separator 43 is arranged at the smoke outlet 414 and is used for separating liquid drops carried in the discharged smoke. The gas-liquid separator 43 may employ a wire demister.
Preferably, the smoke inlet 411 and the liquid outlet 413 are provided at the lower end of the reaction tank 41, and more preferably, at different sides. The liquid inlet 412 and the smoke outlet 414 are provided at the upper end of the reaction tank 41, preferably at different sides. The liquid inlet 412 is connected with the primary clarifier 30 through a pipeline so as to introduce the clarified liquid into the reaction tank 41.
The waste water hardness removing device 40 also comprises a flue 44 connected with the smoke inlet 411, a flue fan 45 arranged on the flue 44, a liquid drainage pipeline 46 connected with the liquid drainage port 413, a conveying pump 47 arranged on the liquid drainage pipeline 46 and a smoke exhaust pipe 48 connected with the smoke exhaust port 414. The flue fan 45 provides power to the flue 44 to draw the treated clean flue gas from the coal-fired power plant or coal-fired power plant into the reaction tank 41. The flue fan 45 is a variable frequency fan, and the smoke inlet amount can be adjusted to adapt to the change of the water amount and the water quality of the desulfurization wastewater. 2 switch valves can be arranged at the inlet of the flue fan 45 for the on-off of the double protection. The outlet of the flue fan 45 is provided with 1 check valve for preventing the flue gas from flowing reversely. A drain 46 is connected between the reaction tank 41 and the secondary reaction clarifier 50. The transfer pump 47 provides power to transfer the clarified liquid after calcium hardness removal to the secondary reaction clarifier 50.
According to the requirement, the wastewater hardness removing device 40 can further comprise a smoke distributor 410 arranged in the reaction tank 41, so that carbon dioxide in the low-temperature clean flue gas entering the reaction tank 41 is uniformly and fully contacted with the wastewater to be subjected to hard desulfurization (i.e. the clarified liquid from the primary clarifier 30) in the reaction tank 41, and the reaction efficiency is improved.
In this embodiment, the smoke distributor 410 includes a ring-shaped smoke passing tube, and a connecting tube connected between the smoke passing tube and the smoke inlet. The whole smoke pipe may be circular or polygonal, and may be formed according to the shape of the inner circumference of the reaction tank 41. The smoke ventilation pipe is communicated with the smoke inlet 411 through a connecting pipe, so that the low-temperature clean smoke enters the smoke ventilation pipe from the smoke inlet 411 and the connecting pipe. The smoke pipe is provided with a plurality of uniformly distributed air distribution holes, and the smoke in the smoke pipe is uniformly output to the reaction tank 41 from the plurality of air distribution holes.
The wastewater hardness removing device 40 also comprises a pH detector 49 arranged on the reaction tank body 41.
The pH detector 49 is used for detecting the pH value of the mixed clarified liquid and carbon dioxide in the reaction tank body 41, and the change of the smoke gas volume is realized by adjusting the motor frequency of the flue fan 45 so as to control the pH value, so that the pH value is kept between 8.0 and 8.5, the thorough hardness removal reaction is ensured, and the overhigh alkalinity caused by bicarbonate radical is avoided.
The secondary reaction clarifier 50 is used for further softening and removing calcium hardness from the desulfurized wastewater, and removing the residual calcium hardness in the wastewater from the wastewater hardness removing device 40 by adding sodium carbonate, coagulant aid and flocculant agent. A mud scraper is arranged in the second-stage reaction clarifier 50, and the bottom of the second-stage reaction clarifier is conical, so that mud is discharged conveniently. Further, a sludge conveying pipeline is connected to the bottom of the secondary reaction clarifier 50 for discharging sludge, and is connected to the sludge dewatering treatment system through the sludge conveying pipeline, and the discharged sludge is sent to the sludge dewatering treatment system for dewatering treatment.
The microfiltration device 60 receives the clarified liquid from the secondary reaction clarifier 50, and filters the clarified liquid to further remove sludge, suspended matters and the like in the clarified liquid. In this embodiment, the microfiltration device 60 employs a tubular microfiltration membrane, and performs cross-flow filtration to control the effluent turbidity SDI to be less than 1 NTU. The bottom of the microfiltration device 60 can also be connected with a sludge dewatering treatment system through a sludge pipeline.
The nanofiltration device 70 receives the produced water from the microfiltration device 60, wherein the nanofiltration membrane has a function of intercepting divalent ions, so that sulfate ions are intercepted to the concentrated water side, the concentration of sodium chloride at the water production side is purified, the salt separation and purification treatment can be carried out on the desulfurization wastewater, and the sodium chloride product salt with the purity of more than 97.5 percent can be produced by the subsequent MVR evaporation device 90. The nanofiltration device 70 conveys the produced water obtained after the treatment to the inlet end of the resin device 80 through a pipeline. In addition, a conveying pipeline 71 is arranged on the concentrated water side of the nanofiltration device 70 and connected with the adjusting tank 10, and the concentrated water obtained after treatment is conveyed to the adjusting tank 10 for further treatment. Preferably, the nanofiltration device 70 employs a nanofiltration membrane resistant to high concentration brine and having a high interception rate of sulfate ions.
The resin device 80 receives the produced water from the nanofiltration device 70 and performs an ion exchange treatment thereon to remove residual hardness ions. Preferably, the resin device 80 is made of chelate resin with high processing precision, and the total hard (calculated by calcium carbonate) concentration in the produced water of the resin device 80 is controlled to be less than 5 mg/l.
The MVR evaporation device 90 may include an MVR evaporation concentration unit, an MVR evaporation crystallization unit, a dehydration unit, and a drying unit, which are connected in sequence. The MVR evaporation concentration unit is connected with a resin device 80. The produced water after the salt separation and purification by a nanofiltration device 70 and the hardness removal by a resin device 80 are thickened and concentrated in an MVR evaporation and concentration unit, and the processed concentrated water is concentrated until the TDS is more than 200000 mg/l; the input end of the MVR evaporative crystallization unit is connected with the output end of the MVR evaporative concentration unit, the produced water of the MVR evaporative concentration unit is subjected to evaporative crystallization treatment, the processable concentrated water is concentrated to TDS > 400000mg/l, and sodium chloride crystal salt (evaporative crystal salt) is separated out.
In the MVR evaporation apparatus 90, the dehydration unit employs a pusher centrifuge, and the drying unit employs a fluidized bed vibration dryer. And (3) carrying out solid-liquid separation and dehydration treatment on the sodium chloride crystal salt obtained by concentration and crystallization through a pusher centrifuge of a dehydration unit, and then carrying out heating and drying treatment through a fluidized bed vibration dryer of a drying unit to further reduce the water content to obtain the dried sodium chloride crystal salt.
The MVR evaporation plant 90 may also comprise a packaging unit, which may be an automatic packaging machine, to weigh the sodium chloride crystallized salt, apply the salt to bags, sew the edges, and belt-transport the salt to obtain bagged product salt.
The evaporative condensed water discharged after the MVR evaporation device 90 treats the wastewater meets the requirements of indirect cooling open type circulating cooling water of GBT50050-2017 design Specification for treating industrial circulating cooling water, and can be reused in a power plant; the sodium chloride product salt is obtained by dehydrating and drying the sodium chloride crystal salt, meets the second-level (97.5%) standard of industrial salt (GB/T5462-2015) refining industrial salt, and can be sold.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A wastewater hardness removal device is used for removing calcium hardness in desulfurization wastewater and is characterized by comprising a closed reaction tank body and a stirrer arranged in the reaction tank body;
the reaction tank body is provided with a smoke inlet for accessing low-temperature clean smoke, a liquid inlet for accessing to-be-hardened desulfurization wastewater, a liquid outlet for discharging desulfurization wastewater after hardening removal and a smoke outlet for discharging smoke after reaction; and a gas-liquid separator is arranged at the smoke outlet.
2. The wastewater hardness removal device according to claim 1, wherein the smoke inlet and the liquid outlet are respectively arranged at the lower end of the reaction tank body; the liquid inlet and the smoke outlet are respectively arranged at the upper end of the reaction tank body.
3. The wastewater hardness removal device as claimed in claim 1, further comprising a flue connected to the smoke inlet, a flue blower disposed on the flue, a drain line connected to the drain port, and a delivery pump disposed on the drain line.
4. The wastewater hardness removal device according to claim 1, further comprising a smoke distributor provided in the reaction tank body;
the smoke distributor comprises an annular smoke through pipe and a connecting pipe connected between the smoke through pipe and the smoke inlet; the smoke through pipe is provided with a plurality of uniformly distributed air distribution holes.
5. The wastewater hardness removal device of claim 1, further comprising a smoke exhaust pipe connected to the smoke exhaust.
6. The wastewater hardness removal device according to any one of claims 1 to 5, further comprising a pH detector provided on the reaction tank body.
7. A desulfurization wastewater zero-emission treatment system is characterized by comprising a regulating reservoir for homogenizing and uniformly measuring desulfurization wastewater, a primary reactor for softening the desulfurization wastewater to remove magnesium hardness, a primary clarifier for clarifying the softened desulfurization wastewater in the primary clarifier, a wastewater hardness removal device for removing calcium hardness in the clarified desulfurization wastewater, a secondary reaction clarifier for removing residual calcium hardness and performing clarification treatment, a microfiltration device for performing filtration treatment on clarified liquid, a nanofiltration device for performing salt separation and purification treatment on filtrate, a resin device for performing ion exchange treatment on produced water of the nanofiltration device, and an MVR evaporation device for performing evaporation concentration and evaporative crystallization treatment on the produced water obtained by the ion exchange treatment;
the wastewater hardness removal device is the wastewater hardness removal device of any one of claims 1-6; the adjusting tank, the first-stage reactor, the first-stage clarifier, the wastewater hardness removal device, the second-stage reaction clarifier, the microfiltration device, the nanofiltration device, the resin device and the MVR evaporation device are sequentially connected.
8. The desulfurization waste water zero-discharge treatment system of claim 7, wherein the bottoms of the primary clarifier and the secondary reaction clarifier are respectively connected with a sludge conveying pipeline.
9. The desulfurization waste water zero-discharge treatment system of claim 7, wherein a delivery pipeline is arranged on the concentrated water side of the nanofiltration device and connected with the regulating tank to deliver the concentrated water to the regulating tank.
10. The desulfurization wastewater zero-emission treatment system of claim 7, wherein the MVR evaporation device comprises an MVR evaporation concentration unit, an MVR evaporation crystallization unit, a dehydration unit and a drying unit which are connected in sequence; the MVR evaporation concentration unit is connected with the resin device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115057582A (en) * | 2022-06-19 | 2022-09-16 | 中石化石油工程技术服务有限公司 | Process and device for reducing drilling wastewater treatment cost |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115057582A (en) * | 2022-06-19 | 2022-09-16 | 中石化石油工程技术服务有限公司 | Process and device for reducing drilling wastewater treatment cost |
| CN115057582B (en) * | 2022-06-19 | 2024-03-05 | 中石化石油工程技术服务有限公司 | Process and device for reducing drilling and production wastewater treatment cost |
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