CN102503020B - Reclaimed water reuse device and application thereof in treatment of hazardous waste - Google Patents
Reclaimed water reuse device and application thereof in treatment of hazardous waste Download PDFInfo
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- CN102503020B CN102503020B CN2011103188625A CN201110318862A CN102503020B CN 102503020 B CN102503020 B CN 102503020B CN 2011103188625 A CN2011103188625 A CN 2011103188625A CN 201110318862 A CN201110318862 A CN 201110318862A CN 102503020 B CN102503020 B CN 102503020B
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Abstract
The invention provides a reclaimed water reuse device. The device comprises a reclaimed water treatment unit, a reclaimed water supply unit and a high-temperature flue gas cooling unit which are connected in sequence. The reclaimed water supply device supplies reclaimed water from the top of the high-temperature flue gas cooling unit, to-be-cooled high-temperature flue gas is charged from the upper part of the high-temperature flue gas cooling unit, the reclaimed water and the high-temperature flue gas exchange heat to thereby cool the high-temperature flue gas, and the cooled high-temperature flue gas is discharged from the lower part of the high-temperature flue gas cooling unit. The inventive device can be used for a high-temperature flue gas cooling process in treatment of hazardous wastes, and has no influence to the high-temperature flue gas cooling process. The indices of the discharged gas meet the discharge requirement, and the consumption of softened water is reduced by 40 t every day.
Description
Technical field
The present invention relates to a kind of middle water recycling device, and should the application of middle water recycling device in Hazardous wastes is processed.
Background technology
Middle water, claim again reuse water, refers to that sewage after suitably processing, reaches certain water-quality guideline, meets certain service requirements, can carry out the water of useful use.Growing along with industry, also increase gradually to the use of water resources, utilizes sustainably limited water resources, and the benign cycle that realizes Ecology is the important goal of industrialization society.Simultaneously, the factory effluent amount that produces in industrial production is large, and processing cost is high.Therefore, factory effluent is processed through certain, continued to utilize, not only saved water resources but also saved cost of sewage disposal, have good Social benefit and economic benefit.
In Hazardous wastes, the treating processes of Hazardous wastes generally includes high temperature incineration or Pintsch process process, and these high-temperature process can produce a large amount of high-temperature flue gas.At present, these gases, usually by such as refrigerating units such as quench towers, carrying out cooling and dust removal process, were cooled to 195 ℃ with flue gas from 600 ℃ within 1 second before discharging, effectively suppress dioxins materials resynthesis under cold condition.
Existing quench tower adopts gas-liquid two-phase double-current method shower nozzle usually, and a road is softening water, and a road is pressurized air, the water of ejection is tiny atomized water, flue gas is in quench tower and water smoke generation heat exchange, and water smoke is evaporated fully, and hot flue gas is cooled into lesser temps simultaneously.Along with flowing of flue gas, in flue gas, heavier solid particulate falls into quench tower bottom flue-dust retainer, and this part can be got rid of through the manual overturning valve of flue-dust retainer bottom, and remainder is along with flue gas enters sack cleaner.During Hazardous wastes is processed, all directly to adopt softening water to carry out cooling for major part, but this process of cooling water loss is large, makes the processing cost of Hazardous wastes increase.
Summary of the invention
The object of the present invention is to provide a kind of middle water recycling device, be used for solving the production wastewater treatment cost high, and the large problem of high-temperature flue gas process of cooling water loss in the Hazardous wastes processing.
According to an embodiment of the invention, described middle water recycling device comprises middle water treatment device, middle water feeder and the high-temperature flue gas refrigerating unit that connects successively, described middle water feeder is water from described high-temperature flue gas refrigerating unit top is supplied with, high-temperature flue gas to be cooled is from the top charging of described refrigerating unit, and described middle water and described high-temperature flue gas carry out heat exchange, thereby make described high-temperature flue gas cooling.
According to an embodiment of the invention, described middle glassware for drinking water has the specific conductivity of 1～2.2 ten thousand μ s/cm, and the pH value is 8～9.
According to an embodiment of the invention, described middle water treatment device comprises air flotation pool, reduction reaction groove, neutralization reaction groove, flocculation sedimentation tank and the BAF that connects successively.
According to another implementation of the invention, described middle water feeder comprises line strainer, middle water precipitation pond and filtered water tank.
According to another embodiment of the present invention, described middle water feeder further comprises softened water tank external between described filtered water tank and described high-temperature flue gas refrigerating unit.
The present invention also provides the application of described middle water recycling device in the Hazardous wastes treating processes.
Middle water recycling device provided by the invention reaches middle water quality standard after treatment with factory effluent and sanitary sewage, and be used for the high-temperature flue gas process of cooling that Hazardous wastes is processed, high-temperature flue gas process of cooling during Hazardous wastes is processed does not form impact, make the gas indices of discharging all can reach emission request, and can reduce approximately 40 tons of softening water consumptions every day.Simultaneously, middle water evaporates in the gas cooling process, and salinity wherein can be converted into lime-ash and remove, thereby has saved the desalination cost.
Description of drawings
Fig. 1 is the process flow sheet of the middle water treatment device of another embodiment according to the present invention.
Fig. 2 is the process flow sheet according to the middle water recycling device of one embodiment of the present invention.
Embodiment
Middle water recycling device of the present invention comprises middle water treatment device, middle water feeder and the high-temperature flue gas refrigerating unit that connects successively, described middle water feeder is water from described high-temperature flue gas refrigerating unit top is supplied with, high-temperature flue gas to be cooled is from described refrigerating unit top fed, and described middle water and described high-temperature flue gas carry out heat exchange, thereby make described high-temperature flue gas cooling, described high-temperature flue gas is discharged from described refrigerating unit bottom after cooling.
Describe middle water recycling device of the present invention in detail hereinafter with reference to Fig. 1 and Fig. 2.
Middle water treatment device
With reference to Fig. 1, middle water treatment device comprises air flotation pool, reduction reaction groove, neutralization reaction groove, flocculation sedimentation tank and BAF.
The wastewater source that the present invention processes is just like factory effluents such as laboratory draining, production plant drainings, and the sanitary sewages such as living drainage and rainwater.At first factory effluent enters air flotation pool and carries out the air supporting processing, removes Petroleum Wastewater pollutent and suspended substance.The waste water that process air supporting is processed enters and wherein is added with FeSO
4With the reduction reaction groove of hydrochloric acid, remove the part heavy metal ion in waste water, as chromium ion (with Cr
6+Be reduced into Cr
3+).The waste water of processing through reduction injects the neutralization reaction groove, injects wherein NaOH solution, NaOH solution one side and waste water generation neutralization reaction; On the other hand, with waste water in most of heavy metal ion (as Cr
3+, Pb
2+, Zn
2+, Ni
2+, Cu
2+Ion etc.) react, generate water-fast throw out.Control the pH value of waste water in 8～9.5 scope by online pH meter.
From and in reactive tank the waste water of discharging enter flocculation sedimentation tank.Flocculation sedimentation tank is to pass through flocculation agent, for example hydrolysis, bridge formation, absorption, the winding effect of polymerize aluminum chloride (PAC) and polyacrylamide (PAM), the small-particle throw out net that is generated by neutralization reaction in waste water is caught into the macrobead alumen ustum, thereby remove suspended substance and colourity in waste water.
Factory effluent after preliminary treatment mixes with sanitary sewage in intermediate pool, then enter BAF and carry out a biological disposal upon.Finally, the sewage after carrying out a biological disposal upon filters, and can obtain specific conductivity is that 1～2.2 ten thousand μ s/cm and pH value are 8～9 middle water.
Middle water feeder
Referring to Fig. 2, middle water feeder comprises line strainer, middle water precipitation pond and the filtered water tank that connects successively.The middle water that reaches Application standard after middle water treatment device is further removed impurity wherein in line strainer, middle water precipitation pond and filtered water tank.
Filtered water tank is connected with return water pipe by filling pipe with high-temperature flue gas refrigerating unit (as quench tower), and middle water injects quench tower via the moisturizing pipeline, and the middle water that surpasses institute's expense returns in filtered water tank via return water pipe.
Middle water feeder further comprises the softened water tank that is connected with return water pipe with filling pipe between filtered water tank and quench tower.In the middle of water shortage when answering the quench tower water, can start as standby soft water water supply installation, close middle water water supply installation, guarantee the normal operation of producing.
The high-temperature flue gas refrigerating unit
In the Hazardous wastes treating processes, Hazardous wastes is carried out thermal desorption and flue gas burning disposal process can produce a large amount of high-temperature flue gas, need to carry out these high-temperature flue gas coolingly to reach emission standard, the effect of high-temperature flue gas refrigerating unit is, within 1 second, high-temperature flue gas is cooled to 150～200 ℃ from 520～650 ℃.High-temperature flue gas refrigerating unit of the present invention can be quench tower, but is not limited to this.
Quench tower adopts gas-liquid two-phase double-current method shower nozzle, and a road is cooling water, and a road is pressurized air, and the water of ejection is tiny atomized water, and high-temperature flue gas is in quench tower and water smoke generation heat exchange.With reference to Fig. 2, the high-temperature flue gas that produces in the Hazardous wastes treating processes enters from quench tower top, and the middle water that meets service requirements injects from the quench tower top by above-mentioned middle water feeder, atomization under compressed-air actuated effect, thus carry out heat exchange with high-temperature flue gas.After heat exchange, water smoke is wherein evaporated fully, and high-temperature flue gas is cooled into lesser temps simultaneously.Along with flowing of flue gas, in flue gas, heavier solid particulate falls into quench tower bottom flue-dust retainer (not shown), and this part can be got rid of through the manual overturning valve of flue-dust retainer bottom, and remainder is along with flue gas enters sack cleaner.
In the Hazardous wastes treating processes, the quench tower feedwater flow is about 1.8 tons/hour, and every day, water consumption was about 40 tons.By water recycling device in the present invention with middle water reuse to quench tower, under the condition of same high temperature flue gas flow and discharge, detect the operation condition of quench tower, and test every discharge index, result is shown in table 1 and table 2.
Table 1 quench tower operation condition data
| Project | The quench tower input gas temperature (℃) | The quench tower exit gas temperature (℃) | Quench tower feedwater flow (m 3/h) |
| Soft water | 520～650 | 150～200 | 1.6～2.0 |
| Middle water | 520～650 | 180～200 | 1.8～2.0 |
Table 2 Hazardous wastes treatment unit tail gas monitoring result
| Monitoring project | HCl | CO | NO | SO 2 | DST | T |
| Emission limit | ≤60 | ≤55 | ≤500 | ≤200 | ≤30 | ＞100 |
| Unit | mg/m 3 | mg/m 3 | mg/m 3 | mg/m 3 | mg/m 3 | ℃ |
| In use, water 1 | 1.1-1.7 | 7.7-45 | 58.9-70.2 | 8.1-9.8 | 11.1-11.5 | 95.4-106.1 |
| In use, water 2 | 0.6-6.8 | 3.0-35.7 | 50.1-131.5 | 6.2-41.3 | 11.2-15.4 | 99.4-119.8 |
| Use soft water | 2.2-12.8 | 1.8-33.6 | 45.1-70.4 | 6.6-40.2 | 8.0-8.4 | 97.0-117.0 |
Can be found out by table 1 and table 2, replace softening water cooling for the high-temperature flue gas of Hazardous wastes treating processes with middle water, substantially suitable to the cooling performance of high-temperature flue gas, and every discharge index all can reach requirement, and every day can reuse water approximately 40 tons, saves more than 40 ton of softening water consumption.
In addition,, because middle water is weakly alkaline, can also play the effect of removing sour gas, reduce the pressure of deacidifying device, reduce the consumption of depickling auxiliary material; And middle water reuse, to quench tower, can, except the salinity in anhydrating, be translated into lime-ash and remove, thereby save the desalination cost.
Claims (5)
1. water recycling device in a kind, comprise the middle water treatment device, middle water feeder and the high-temperature flue gas refrigerating unit that connect successively, described middle water feeder is water from described high-temperature flue gas refrigerating unit top is supplied with, high-temperature flue gas to be cooled is from the top charging of described refrigerating unit, and described middle water and described high-temperature flue gas carry out heat exchange in described refrigerating unit, thereby make described high-temperature flue gas cooling, wherein said high-temperature flue gas refrigerating unit is quench tower;
Wherein said middle glassware for drinking water has the specific conductivity of 1～2.2 ten thousand μ s/cm, and 8～9 pH value;
Wherein said middle water treatment device comprises successively:
Air flotation pool, be used for removing Petroleum Wastewater pollutent and suspended substance;
The reduction reaction groove, be used for removing the part heavy metal ion from the waste water of described air flotation pool output;
The neutralization reaction groove, be used for the waste water of neutralization from described reduction reaction groove output, and make the heavy metal ion precipitation;
Flocculation sedimentation tank, be used for removing suspended substance and colourity from the waste water of described neutralization reaction groove output; With
BAF, be used for removing organism and biology from the waste water of described flocculation sedimentation tank output.
2. middle water recycling device according to claim 1, wherein said middle water feeder comprise line strainer, middle water precipitation pond and the filtered water tank that connects successively, further to remove the impurity in the middle water after middle water treatment.
3. middle water recycling device according to claim 2, wherein said filtered water tank is connected with return water pipe by filling pipe with described high-temperature flue gas refrigerating unit, and described middle water injects described high-temperature flue gas refrigerating unit via described filling pipe, and over the described middle water of institute's expense, via described return water pipe, returns to described filtered water tank.
4. middle water recycling device according to claim 3, wherein said middle water feeder further comprise between described filtered water tank and described high-temperature flue gas refrigerating unit with described filling pipe be connected the softened water tank that return water pipe is connected, described softened water tank when the middle water yield is under-supply as standby water supply installation.
5. the application of the described middle water recycling device of any one in the Hazardous wastes treating processes in claim 1 to 4.
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|---|---|---|---|
| CN2011103188625A CN102503020B (en) | 2011-10-19 | 2011-10-19 | Reclaimed water reuse device and application thereof in treatment of hazardous waste |
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|---|---|---|---|
| CN2011103188625A CN102503020B (en) | 2011-10-19 | 2011-10-19 | Reclaimed water reuse device and application thereof in treatment of hazardous waste |
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| CN102503020B true CN102503020B (en) | 2013-11-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188888A (en) * | 2011-04-12 | 2011-09-21 | 王晓晔 | A wet method treatment process of purified flue gas with a water collection function in the process and a processing apparatus thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188888A (en) * | 2011-04-12 | 2011-09-21 | 王晓晔 | A wet method treatment process of purified flue gas with a water collection function in the process and a processing apparatus thereof |
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Owner name: HEBEI JINYU MANGROVE ENVIRONMENTAL TECHNOLOGY LTD. Free format text: FORMER OWNER: BEIJING ECO-ISLAND SCIENCE AND TECHNOLOGY CO.,LTD. Effective date: 20150428 |
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Effective date of registration: 20150428 Address after: 065201 Yanjiao Development Zone, Hebei, Sanhe Patentee after: Hebei Jinyu mangrove green technology Co., Ltd Address before: 102402 Beijing City, Fangshan District Doudian town Yaxinlu No. 33 Patentee before: Beijing Eco-Island Science and Technology Co.,Ltd. |
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Effective date of registration: 20181204 Address after: Room 608, North Control Science and Technology Building, No. 10, Baifuquan Road, Changping District Science and Technology Park, Beijing 102200 Co-patentee after: Beijing Eco-Island Science and Technology Co.,Ltd. Patentee after: Beijing Jinyu Hongshulin Environment Protecting Techn Co., Ltd. Address before: 065201 Pioneer Building, Yanjiao Development Zone, Sanhe City, Hebei Province Patentee before: Hebei Jinyu mangrove green technology Co., Ltd |