CN112194318A - Flue gas waste heat concentration method and device for desulfurization wastewater - Google Patents
Flue gas waste heat concentration method and device for desulfurization wastewater Download PDFInfo
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- CN112194318A CN112194318A CN202011041575.XA CN202011041575A CN112194318A CN 112194318 A CN112194318 A CN 112194318A CN 202011041575 A CN202011041575 A CN 202011041575A CN 112194318 A CN112194318 A CN 112194318A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 41
- 230000023556 desulfurization Effects 0.000 title claims abstract description 41
- 239000002351 wastewater Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000003546 flue gas Substances 0.000 title claims abstract description 29
- 239000002918 waste heat Substances 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 238000000926 separation method Methods 0.000 claims abstract description 30
- 238000005352 clarification Methods 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000005496 tempering Methods 0.000 claims abstract description 16
- 239000006228 supernatant Substances 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 12
- 239000010802 sludge Substances 0.000 claims abstract description 8
- 238000001704 evaporation Methods 0.000 claims abstract description 6
- 230000008020 evaporation Effects 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 3
- 230000000171 quenching effect Effects 0.000 claims abstract description 3
- 238000007711 solidification Methods 0.000 claims abstract description 3
- 230000008023 solidification Effects 0.000 claims abstract description 3
- 230000003750 conditioning effect Effects 0.000 claims description 22
- 239000010440 gypsum Substances 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 5
- 208000028659 discharge Diseases 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention provides a method and a device for concentrating flue gas waste heat of desulfurization wastewater. The method comprises the steps of concentrating the waste heat of the flue gas of the wastewater and separating the solid and the liquid of the concentrated solution, and the treated desulfurization wastewater can enter a subsequent system for solidification treatment, so that the zero emission of the desulfurization wastewater is finally realized. Specifically, the method of the present invention comprises: the desulfurization wastewater enters a concentration unit for flue gas evaporation concentration; the concentrated solution generated by the concentration unit enters a tempering unit to adjust the pH value of the concentrated solution; after the concentrated solution after the quenching and tempering enters a cyclone unit for primary solid-liquid separation, the top flow enters a clarification unit and the bottom flow is discharged out of the cyclone unit; separating the top flow into sludge and supernatant in the clarification unit, wherein the sludge flows back to the tempering unit and the supernatant enters the filtering unit; and carrying out solid-liquid separation on the supernatant in a filtering unit to obtain a clear liquid. The method can realize the high-efficiency concentration and solid-liquid separation of the desulfurization wastewater, and the reduction of the wastewater and the solid-liquid separation of the concentrated solution.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to concentration and solid-liquid separation treatment of desulfurization wastewater generated by wet flue gas desulfurization.
Background
The limestone-gypsum wet desulphurization has the advantages of high desulphurization efficiency and low investment and operation cost, so that the limestone-gypsum wet desulphurization method is widely applied to flue gas desulphurization. However, the method can generate the desulfurization wastewater with large pollution in the desulfurization process, and the direct discharge of the wastewater can cause great harm to the environment, so that the zero discharge treatment of the desulfurization wastewater gradually becomes the development trend of the industry. In recent years, various desulfurization wastewater zero-discharge technologies appear in the market, wherein the flue gas waste heat concentration technology is a popular technology in the desulfurization wastewater zero-discharge market at the present stage due to low investment and operation cost. For example, patent numbers CN208762185U and CN108275744A both describe flue gas waste heat concentration technology of desulfurization waste water. However, the flue gas waste heat concentration technology of the desulfurization wastewater can generate a concentrated solution with high solid content, high salt content, low pH and high corrosivity in the desulfurization wastewater treatment process, and the concentrated solution is often required to be subjected to solid-liquid separation in the zero emission treatment process of the desulfurization wastewater so as to meet the subsequent wastewater treatment requirements. The main treatment mode of the solid-liquid separation of the concentrated solution at the present stage is as follows: separating the concentrated solution with a filter press, performing spray evaporation on the separated concentrated solution, and treating the separated solid as mud cake. Such a treatment method has the following disadvantages: firstly, the filter pressing equipment is high in price, the mounted civil engineering quantity is large, and the investment cost is high; secondly, the filter press needs to be attended by operators for a long time, the labor intensity is high, and the labor cost is high; thirdly, the concentrated solution has high salt content and strong corrosivity, so that the failure rate of the filter press is high in the operation process; finally, the mud cake produced by the filter press device is also difficult to digest.
Disclosure of Invention
The invention provides a flue gas waste heat concentration method of desulfurization wastewater, which introduces a cyclone on the basis of the prior art to assist in solid-liquid separation of concentrated solution generated in a flue gas waste heat concentration process. The concentrated liquid solid-liquid separation device solves the problems of high investment cost, high operation failure rate and high labor intensity of the concentrated liquid solid-liquid separation device in the existing desulfurization wastewater flue gas waste heat concentration process.
In order to solve the problems, the invention adopts the following technical scheme:
in one aspect, the present invention provides a method for concentrating residual heat from flue gas of desulfurization wastewater, comprising:
(1) the desulfurization waste water enters a concentration unit to carry out flue gas evaporation concentration,
(2) the concentrated solution generated by the concentration unit enters a tempering unit to adjust the pH value of the concentrated solution,
(3) the concentrated solution after the quenching and tempering enters a cyclone unit for primary solid-liquid separation, wherein the top flow enters a clarification unit and the bottom flow is discharged from the cyclone unit,
(4) the top flow is separated in the clarification unit into sludge and supernatant, wherein the sludge is returned from the bottom of the clarification unit to the conditioning unit and the supernatant is passed to the filtration unit, and
(5) and carrying out solid-liquid separation on the supernatant in a filtering unit to obtain a clear liquid.
In some embodiments, the desulfurized wastewater is atomized in a concentration unit and the atomized desulfurized wastewater is heated to evaporate and concentrate using residual heat of flue gas to produce a concentrated solution.
In some embodiments, the desulfurization waste water has a solid content of 1 to 5 wt.%.
In some embodiments, the concentration unit produces a concentrate having a solids content of 10 to 20 weight percent.
In some embodiments, the concentration unit comprises a flue gas concentration column.
In some embodiments, a conditioning agent is added into the conditioning unit to adjust the concentrated solution from acidity (pH < 4) to neutrality or alkalescence (pH 6-8) so as to improve the solid-liquid separation efficiency and reduce the corrosion effect of the concentrated solution on equipment.
In some embodiments, the conditioning agent is calcium carbonate or calcium hydroxide.
In some embodiments, the residence time of the concentrate in the conditioning unit is from 0.5 to 2.0 hours.
In some embodiments, the conditioning unit comprises a conditioning tank or a conditioning bath.
In some embodiments, the conditioning unit comprises an agitator, such as an overhead agitator.
In some embodiments, the underflow is discharged from the cyclonic unit to a gypsum solid-liquid separation device of the desulfurization system.
In some embodiments, the gypsum solid-liquid separation device of the desulfurization system is a vacuum belt dehydrator or a disc dehydrator.
In some embodiments, the cyclonic unit comprises at least one cyclone. When the cyclone unit comprises more than one cyclone, the cyclones are connected in series.
In some embodiments, when more than one cyclone is connected in series (referred to in turn as first stage cyclone, second stage cyclone … …, nth stage cyclone), the top stream of a previous stage cyclone is fed to a next stage cyclone and the underflow of the next stage cyclone is returned to the previous stage cyclone, wherein the underflow of the first stage cyclone enters the gypsum solid-liquid separation unit of the desulfurization system and the top stream of the last stage cyclone enters the clarification unit.
In some embodiments, the overhead stream separated by the cyclonic unit has a solids content of from 1 to 5 wt%.
In some embodiments, the overhead stream separated by the cyclonic flow unit is subjected to a secondary separation in the clarification unit using gravity settling.
In some embodiments, the clarification unit is a settling tank.
In some embodiments, the filtration unit performs a deep solid-liquid separation of the supernatant from the clarification unit to meet subsequent atomized water quality requirements.
In some embodiments, the filtration unit is a filter.
In some embodiments, the filtration unit comprises at least one filter.
In some embodiments, the filter comprises a sand filter or a bag filter.
In some embodiments, the precision of the filter is 200 μm or less.
In some embodiments, the clear liquid from the filtration unit is discharged into a wastewater solidification system.
In another aspect, the invention provides a flue gas waste heat concentration device for desulfurization wastewater, which comprises a concentration unit, a conditioning unit, a cyclone unit, a clarification unit and a filtering unit, wherein the concentration unit, the conditioning unit, the cyclone unit, the conditioning unit and the clarification unit, the cyclone unit and the clarification unit are connected through pipelines. The flue gas waste heat concentration method is carried out by the flue gas waste heat concentration device.
The desulfurization wastewater flue gas waste heat concentration method and the device provided by the invention use the cyclone unit (cyclone) as a primary solid-liquid separation device, and then are matched with an original vacuum belt conveyor or a disc dehydrator in a wet desulfurization system for use, so that a filter press in the prior art is replaced. The method and the device can realize the high-efficiency concentration and the solid-liquid separation of the desulfurization wastewater, and can realize the reduction of the wastewater and the solid-liquid separation of the concentrated solution. In one aspect, the method and apparatus of the present invention can reduce investment costs; on the other hand, the method and the device of the invention can realize the advantages of continuous automatic operation, large treatment capacity, low labor intensity of operators and no mud cake disposal problem.
Drawings
The invention is further described below with reference to the following figures and examples:
fig. 1 is a schematic diagram of a flue gas waste heat concentration method in example 1 (1 concentration unit, 2 tempering unit, 3 cyclone unit, 4 clarification unit, 5 filtration unit).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in FIG. 1, the desulfurization waste water produced from the wet desulfurization system of a coal-fired power plant has a solid content of 1% by weight. The desulfurization waste water directly enters a flue gas waste heat concentration tower, and is concentrated into a concentrated solution with the solid content of 10 weight percent and the pH value of 1 after low-temperature flue gas contact heat exchange evaporation. The concentrated solution enters a tempering unit, the pH value of the concentrated solution is adjusted to 7 by taking limestone slurry as a tempering agent in a tempering box, and then the concentrated solution enters a cyclone device. The cyclone device comprises 1 cyclone, underflow with the solid content of 16 weight percent after cyclone flows back to the vacuum belt conveyor for dehydration separation, and overflow with the solid content of 1 weight percent enters the clarification tank for gravity settling. Supernatant fluid of the clarification tank overflows into a sand filter for filtering, the filtered supernatant fluid is discharged for subsequent treatment, and slurry at the bottom of the clarification tank is sent into a conditioning box through a sludge pump. After the process is adopted, the desulfurization wastewater realizes the concentration of the waste heat of the flue gas and the high-efficiency solid-liquid separation, the content of the separated liquid suspended matters is lower than 200mg/L, the maximum particle size of the suspended matters is smaller than 2 mu m, the atomization requirement of a double-fluid spray gun is met, and the flue evaporation can be directly carried out. The solid is mixed into the gypsum through a vacuum belt conveyor.
Claims (9)
1. A method for concentrating flue gas waste heat of desulfurization wastewater comprises the following steps:
(1) the desulfurization waste water enters a concentration unit for flue gas evaporation concentration,
(2) the concentrated solution generated by the concentration unit enters a tempering unit to adjust the pH value of the concentrated solution,
(3) the concentrated solution after the quenching and tempering enters a cyclone unit for primary solid-liquid separation, wherein the top flow enters a clarification unit and the bottom flow is discharged from the cyclone unit,
(4) the top stream is separated in the clarification unit into sludge and supernatant, wherein the sludge is returned to the conditioning unit and the supernatant enters a filtration unit, and
(5) and carrying out solid-liquid separation on the supernatant in the filtering unit to obtain a clear liquid.
2. The device comprises a concentration unit, a conditioning unit, a rotational flow unit, a clarification unit and a filtering unit, wherein the concentration unit is connected with the conditioning unit, the conditioning unit is connected with the rotational flow unit, the conditioning unit is connected with the clarification unit, the rotational flow unit is connected with the clarification unit and the clarification unit are connected with the filtering unit through pipelines.
3. The method according to claim 1 or the apparatus according to claim 2, wherein the desulfurization waste water is atomized in the concentration unit and the atomized desulfurization waste water is heated, evaporated and concentrated using residual heat of flue gas to produce a concentrated solution,
preferably, the concentration unit comprises a flue gas concentration column.
4. The method according to claim 1 or the apparatus according to claim 2, wherein a conditioning agent is added to the conditioning unit to adjust the concentrate from acidic to neutral or weakly basic,
preferably, the conditioning agent is calcium carbonate or calcium hydroxide,
preferably, the residence time of the concentrated solution in the tempering unit is 0.5 to 2.0 hours,
preferably, the tempering unit comprises a tempering box or a tempering tank,
preferably, the conditioning unit comprises an agitator, such as an overhead agitator.
5. The method of claim 1 or the apparatus of claim 2, wherein an underflow is discharged from the cyclone unit to a gypsum solid-liquid separation unit of a desulfurization system,
preferably, the gypsum solid-liquid separation device of the desulfurization system is a vacuum belt dehydrator or a disc dehydrator,
preferably, the solids content of the overhead stream separated by the cyclone unit is from 1 to 5% by weight.
6. The method according to claim 1 or the apparatus according to claim 2, wherein the cyclone unit comprises at least one cyclone,
preferably, when the cyclone unit comprises more than one cyclone, the cyclones are connected in series,
preferably, when more than one cyclone is connected in series, the top flow of the previous cyclone is used as the feed of the next cyclone, the bottom flow of the next cyclone is returned as the feed of the previous cyclone, wherein the bottom flow of the first cyclone enters the gypsum solid-liquid separation device of the desulfurization system, and the top flow of the last cyclone enters the clarification unit.
7. The method according to claim 1 or the device according to claim 2, wherein the secondary separation is carried out on the top flow separated by the cyclone unit in the clarification unit by using gravity sedimentation, the sludge at the bottom of the clarification unit returns to the tempering unit, the supernatant of the clarification unit enters the filtering unit,
preferably, the clarification unit is a sedimentation tank.
8. The method according to claim 1 or the apparatus according to claim 2, wherein the filtration unit performs a deep solid-liquid separation of the supernatant from the clarification unit,
preferably, the filter unit is a filter,
preferably, the filtration unit comprises at least one filter,
preferably, the filter comprises a sand filter or a bag filter,
preferably, the precision of the filter is 200 μm or less.
9. The method of claim 1 or the apparatus of claim 2, wherein the supernatant from the filtration unit is discharged into a wastewater solidification system.
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| CN111423046A (en) * | 2020-04-23 | 2020-07-17 | 大唐环境产业集团股份有限公司 | Power plant desulfurization wastewater advanced treatment and resource utilization system and method |
| CN111675370A (en) * | 2020-05-13 | 2020-09-18 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Method and device for modifying desulfurization wastewater concentrated solution |
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Application publication date: 20210108 |