CN111170543A - Desulfurization waste liquid recycling environment-friendly cooperative treatment system and method - Google Patents
Desulfurization waste liquid recycling environment-friendly cooperative treatment system and method Download PDFInfo
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- CN111170543A CN111170543A CN202010059386.9A CN202010059386A CN111170543A CN 111170543 A CN111170543 A CN 111170543A CN 202010059386 A CN202010059386 A CN 202010059386A CN 111170543 A CN111170543 A CN 111170543A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- 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
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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Abstract
The invention relates to a resource environment-friendly co-treatment system and method for desulfurization waste liquid, which integrate the environment-friendly treatment problem of desulfurization waste liquid water and the recycling problem of electric precipitator dust of a sintering machine head; stirring and dissolving the desulfurization waste liquid and the machine head ash according to a specific proportion; adding carbonate to precipitate calcium and magnesium ions, so that the final filtrate only contains common salts such as potassium, sodium and the like; meanwhile, the high-salinity wastewater transfer tank can be used as a cooling tank of the denitration system, so that the temperature of the high-salinity wastewater is synchronously increased, and the subsequent evaporative crystallization is facilitated; high-salt wastewater and high-pressure compressed air are synchronously introduced into an ultrafine atomizing spray head and sprayed into a high-temperature environment of not less than 180 ℃, atomized droplets are instantaneously evaporated, formed water vapor is discharged to the atmosphere along with flue gas, crystallized KCl and NaCl crystals are settled in a specified device, and the recycling of chloride ions is realized; the newly produced iron concentrate powder can be directly conveyed to a comprehensive stock yard for circular application because the newly produced iron concentrate powder does not contain a large amount of potassium, sodium elements and chloride ions.
Description
Technical Field
The invention belongs to the field of wastewater environment-friendly treatment in the steel industry, and particularly relates to an energy-saving environment-friendly treatment method for multi-material cooperative treatment.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the increase of the attention degree of the state to the environmental protection field, the pressure of the iron and steel industry which is taken as a row of households is the first place; the sintering process is the process with the largest total smoke emission in the steel industry process, and the desulfurization of the sintering smoke becomes the necessary process flow for each steel enterprise; in the wet desulphurization process, besides a large amount of desulphurization gypsum is generated, a large amount of desulphurization waste liquid needs to be subjected to deep environmental protection treatment;
the sintering desulfurization waste liquid contains a large amount of chloride ions, and the traditional methods comprise two methods, namely, the desulfurization waste liquid is discharged to a sintering mixing position to replace tap water to participate in production or is discharged to a blast furnace slag flushing position, and is mixed into slag flushing water to carry out slag flushing operation; the other is that the enterprise pays a disposal fee and hands the waste liquid to a third party with treated paper for harmless disposal; because the desulfurization waste liquid has stronger corrosivity, after entering the production system, chloride ions can rapidly erode all production pipelines along with the steam, cause incessant corrosion to metal pipeline and equipment, show the effective life who reduces equipment. If the waste liquid is handed over to a qualified third party for disposal, the enterprise is required to pay high disposal cost.
The electric dedusting ash of the sintering machine head is a byproduct of a sintering process, is misled by widely advocated cost reduction thoughts of circular economy, and after cyclic utilization, the potassium element of the machine head ash is as high as 40 percent, so that the serious grate bar pasting and blocking phenomenon is not caused, more potassium elements are substituted into a system, the degradation influence is caused on the hot coke of the blast furnace, the condition of the blast furnace is further influenced, and the problem is endless; tracing to this source, all chloride ions in the desulfurization waste liquid come from elegant sintering machine head electro-precipitator dust.
Disclosure of Invention
In order to overcome the problems, the invention provides a resource-friendly co-treatment system and method for desulfurization waste liquid. The method realizes the cooperative treatment of the desulfurization waste liquid and the sintering machine head ash, forms a resource way while realizing a high environment-friendly goal, realizes the win-win of energy conservation and environment protection, and also provides a new way for enterprises to reduce the production cost.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a desulfurization waste liquid resource environmental protection is dealt with system in coordination, includes: a sintering machine head ash intermediate storage bin 1, a desulfurization waste liquid tank 4, a machine head ash preliminary dissolving tank A, a machine head ash fully stirring tank B, a high-salinity wastewater transfer tank C, an iron fine powder storage tank D and a waste heat centralized discharge chimney E; storehouse 1, desulfurization waste liquid pond 4, aircraft nose ash intensive mixing pond B, high salt waste water transfer pond C link to each other respectively in the middle of aircraft nose ash preliminary dissolving tank A and the aircraft nose ash, aircraft nose ash intensive mixing pond B links to each other with fine iron powder storage tank D, high salt waste water transfer pond C still links to each other with the spray set that the chimney E was discharged in the waste heat concentration.
The application integrates the rapid evaporative crystallization technology of high-salinity wastewater, the spray evaporation technology of ultrafine particle size and the full utilization technology of low-quality heat source, and the desulfurization waste liquid and the sintering machine head electro-precipitator dust are subjected to linkage cooperative treatment, so that multiple purposes are achieved.
In some embodiments, a plate filter press 11 is disposed above the fine iron powder storage tank D.
In some embodiments, an annular high-salinity wastewater supply pipeline 16 is further arranged between the high-salinity wastewater transfer pond C and the spraying device of the residual heat concentrated discharge chimney E.
In some embodiments, the annular high salinity wastewater feed line 16 is connected to a compressed air manifold 18.
In some embodiments, the waste heat concentrated discharge chimney E is a discharge chimney of a hot blast stove, a steel rolling heating furnace or a denitration flue gas heating furnace of a steel enterprise.
In some embodiments, the sintering machine head ash intermediate storage silo 1 is provided with an automatic metering device.
In some embodiments, two sides of the plate filter press 11 are respectively provided with a pipeline connected to the machine head ash preliminary dissolving tank a and the high-salinity wastewater transfer tank C.
In some embodiments, the plate filter press 11 is provided with control valves 10 between the two sides and the machine head ash preliminary dissolving tank a.
In some embodiments, the plate filter press 11 is provided with a control valve 12 between the high salinity wastewater transfer tank C and each of the two sides.
The invention also provides a resource environment-friendly co-treatment method of the desulfurization waste liquid, which comprises the following steps:
dissolving the machine head ash in the desulfurization waste liquid, uniformly mixing, adding carbonate, and precipitating;
filtering the precipitated wastewater to form high-salinity wastewater;
mixing the high-salinity wastewater with compressed air, atomizing, evaporating, and collecting KCl and NaCl crystals.
The invention has the beneficial effects that:
(1) the application solves the problem that the desulfurization waste liquid water is difficult to be environmentally-friendly and treated due to high chloride ion content.
(2) The method solves the problems that sintering machine head ash is rich in K element, so that sintering grate bars are stuck and blocked, and the thermal state performance of blast furnace coke is deteriorated;
(3) according to the method, the machine head ash and the desulfurization waste liquid are cooperatively treated in an environment-friendly manner, so that the chlorine element is recycled;
(4) the method adopts an ultra-fine atomization rapid evaporative crystallization technology, and solves the problem of high energy consumption of membrane high-temperature evaporative crystallization;
(5) the application not only serves as the function of cooling and heat exchange of part of high-temperature flue gas in the sintering flue gas denitration process, but also utilizes a low-quality heat source in a plant area.
(6) The operation method is simple, low in cost, universal and easy for large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic structural view of the apparatus of embodiment 1.
Wherein, 1, a sintering machine head ash middle storage bin, 2 machine head ash feeding control valves, 3 sewage pumps, 4 desulfurization waste liquid pools, 5 desulfurization waste liquid control valves, 6 stirring pumps, 7 sewage pumps, 8 stirring pumps, 9 sewage pumps, 10 desulfurization waste liquid control valves, 11-plate filter presses, 12 desulfurization waste liquid control valves, 13 sewage pumps, 14 desulfurization waste liquid control valves, 15 compressed air control valves, 16-ring-shaped desulfurization waste liquid supply pipelines, 17-ring-shaped compressed air supply pipelines, 18 compressed air header pipes and 19 atomizing nozzles;
a machine head ash preliminary dissolving tank A, a machine head ash fully stirring tank B, a high-salinity wastewater transfer tank C, a fine iron powder storage tank D and a waste heat concentrated discharge chimney E;
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the method aims at the problems of poor treatment effect and large environmental hazard of the prior desulfurization waste liquid and sintering machine head electro-precipitator dust. Therefore, the invention provides a resource process flow for realizing the cooperative deep treatment of the desulfurization waste liquid and the sintering machine head electro-precipitator dust, which comprises the following steps: a desulfurization waste liquid dissolving machine head ash system, a solid-liquid separation system and a high-salinity wastewater evaporative crystallization system;
conveying machine head ash in a sintering procedure to a temporary intermediate storage bin 1, and feeding the machine head ash to a primary dissolving tank A through a star-shaped feeding valve 2; the desulfurization waste liquid of the synchronous sintering flue gas desulfurization system is directly conveyed to the primary dissolving tank A by a sewage pump 3. The desulfurization waste liquid is used as a flux to form uniform turbid liquid together with the machine head ash under the action of the stirring pump 6; the turbid liquid is conveyed to a fully stirring pool B by a sewage pump 7; the fully stirred turbid liquid is conveyed to a plate type filter press 11 by a sewage pump 9; fine iron powder with water content of about 7% can be obtained after water is filtered by the filter press, and meanwhile, filtrate water flows back to the preliminary dissolving tank A through a control valve 10; when the salt content of the circulating water reaches a certain concentration, opening a valve 12, closing a valve 10, and allowing the high-salt wastewater to enter an atomization evaporation crystallization system; the high-salinity wastewater is conveyed to an annular high-salinity wastewater supply pipeline through a sewage pump 13, then is distributed to a plurality of branch pipelines, and is sent to an atomizing nozzle 20 through a control valve 14; meanwhile, high-pressure compressed air is also sent to the atomizing nozzle 20 to form a double-flow high-pressure atomizing mode, so that high-salt wastewater in an atomizing state with the droplet diameter of about 10 microns is obtained; in the chimney with concentrated waste heat discharge (about 200 deg.C), small drops are instantaneously evaporated and crystallized, the steam directly discharges crystals to naturally settle down, and the collected crystals are crystal salt with KCl as main body and can be used as raw material for chemical industry and fertilizer industry.
Preferably: the water level in the preliminary dissolving tank can be automatically controlled, and the wastewater in the desulfurization waste liquid tank can be controlled by a sewage pump, a flowmeter and a control valve, so that the supply at any time is realized, and the normal operation of a sintering flue gas desulfurization system is not influenced;
preferably: the intermediate storage bin for the sintering machine head ash is provided with an automatic metering device, so that the ash amount input into the preliminary dissolving tank can be accurately metered;
preferably: the full stirring pool is used for fully dissolving salts in the machine head ash by using the desulfurization waste liquid water, simultaneously adding carbonate, and forming precipitates from calcium ions and magnesium ions with the highest specific gravity in the machine head ash so as to prepare for subsequent solid-liquid separation and purification of filtrate water.
Preferably: when the chloride ions do not reach the set standard, the filtrate water generated by the plate filter press flows back to the preliminary dissolving tank through the control valve 10; when the content of chloride ions exceeds a set value, filtrate water enters a high-salinity wastewater transfer pool through a control valve 12;
the plate filter press is used for filter pressing the mixed turbid liquid of the head electric precipitator dust fully dissolved by the desulfurization waste liquid, and the solid collected by filter pressing mainly comprises fine iron powder and contains a small amount of CaCO3、MgCO3Solid precipitate can be directly fed into stock ground to participate in batching;
preferably: the annular high-salinity wastewater supply pipeline can be branched from 360 degrees and is connected to the ultra-fine atomizing spray head; the atomization power source can be directly from a compressed air pipeline which is more than or equal to 0.3MPa in a plant area; the double-flow atomizing nozzle can realize ultra-fine atomization with the grain diameter of 10 microns;
preferably: the waste heat centralized discharge chimney can be selected from discharge chimneys of hot blast stoves, steel rolling heating furnaces, denitration flue gas heating furnaces and the like of steel enterprises, and the flue gas temperature can be controlled to be more than 180 ℃ to meet the requirements.
Based on the method for recycling and environment-friendly co-processing the desulfurization waste liquid, the desulfurization waste liquid and the machine head ash simultaneously enter a primary dissolving tank according to a specific proportion to be stirred and dissolved, carbonate is added into the fully-stirred dissolving tank, calcium and magnesium ions form precipitates, and the final filtrate water only contains common salts such as potassium, sodium and the like; the high-salinity wastewater transfer tank can be used as a cooling tank of a pin removal system, so that the temperature of the high-salinity wastewater is synchronously increased, and the subsequent evaporative crystallization is facilitated; introducing high-salt wastewater and high-pressure compressed air into an ultrafine atomizing spray head synchronously, spraying the high-temperature environment with the environment temperature not lower than 180 ℃, evaporating atomized droplets instantaneously, discharging the formed vapor to the atmosphere along with flue gas, and settling crystallized KCl and NaCl crystals into a specified device;
the present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
a resource process flow for realizing cooperative deep treatment of desulfurization waste liquid and sintering machine head electro-precipitator dust comprises the following steps: a desulfurization waste liquid dissolving machine head ash system, a solid-liquid separation system and a high-salinity wastewater evaporative crystallization system;
conveying machine head ash in a sintering procedure to a temporary intermediate storage bin 1, and feeding the machine head ash to a primary dissolving tank A through a star-shaped feeding valve 2; the desulfurization waste liquid of the synchronous sintering flue gas desulfurization system is directly conveyed to the primary dissolving tank A by a sewage pump 3. The desulfurization waste liquid is used as a flux to form uniform turbid liquid together with the machine head ash under the action of the stirring pump 6; the turbid liquid is conveyed to a fully stirring pool B by a sewage pump 7; the fully stirred turbid liquid is conveyed to a plate type filter press 11 by a sewage pump 9; fine iron powder with water content of about 7% can be obtained after water is filtered by the filter press, and meanwhile, filtrate water flows back to the preliminary dissolving tank A through a control valve 10; when the salt content of the circulating water reaches a certain concentration, opening a valve 12, closing a valve 10, and allowing the high-salt wastewater to enter an atomization evaporation crystallization system; the high-salinity wastewater is conveyed to an annular high-salinity wastewater supply pipeline through a sewage pump 13, then is distributed to a plurality of branch pipelines, and is sent to an atomizing nozzle 20 through a control valve 14; meanwhile, high-pressure compressed air is also sent to the atomizing nozzle 20 to form a double-flow high-pressure atomizing mode, so that high-salt wastewater in an atomizing state with the droplet diameter of about 10 microns is obtained; in the chimney with concentrated waste heat discharge (about 200 deg.C), small drops are instantaneously evaporated and crystallized, the steam directly discharges crystals to naturally settle down, and the collected crystals are crystal salt with KCl as main body and can be used as raw material for chemical industry and fertilizer industry.
Based on the method for recycling and environment-friendly co-processing the desulfurization waste liquid, the desulfurization waste liquid and the machine head ash simultaneously enter a primary dissolving tank according to a specific proportion to be stirred and dissolved, carbonate is added into the fully-stirred dissolving tank, calcium and magnesium ions form precipitates, and the final filtrate water only contains common salts such as potassium, sodium and the like; the high-salinity wastewater transfer tank can be used as a cooling tank of a pin removal system, so that the temperature of the high-salinity wastewater is synchronously increased, and the subsequent evaporative crystallization is facilitated; introducing high-salt wastewater and high-pressure compressed air into an ultrafine atomizing spray head synchronously, spraying the high-temperature environment with the environment temperature not lower than 180 ℃, evaporating atomized droplets instantaneously, discharging the formed vapor to the atmosphere along with flue gas, and settling crystallized KCl and NaCl crystals into a specified device;
it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a desulfurization waste liquid resourceization environmental protection is processing system in coordination which characterized in that includes: a sintering machine head ash intermediate storage bin 1, a desulfurization waste liquid tank 4, a machine head ash preliminary dissolving tank A, a machine head ash fully stirring tank B, a high-salinity wastewater transfer tank C, an iron fine powder storage tank D and a waste heat centralized discharge chimney E; storehouse 1, desulfurization waste liquid pond 4, aircraft nose ash intensive mixing pond B, high salt waste water transfer pond C link to each other respectively in the middle of aircraft nose ash preliminary dissolving tank A and the aircraft nose ash, aircraft nose ash intensive mixing pond B links to each other with fine iron powder storage tank D, high salt waste water transfer pond C still links to each other with the spray set that the chimney E was discharged in the waste heat concentration.
2. The recycling environmental-friendly synergistic treatment system for the desulfurization waste liquid as claimed in claim 1, wherein a plate filter press 11 is arranged above the fine iron powder storage tank D.
3. The recycling, environmental-friendly and co-processing system for the desulfurization waste liquid as claimed in claim 1, wherein an annular high-salinity wastewater supply pipeline 16 is further arranged between the high-salinity wastewater transfer tank C and the spraying device of the waste heat concentrated discharge chimney E.
4. The recycling environmental-friendly cooperative disposal system for desulfurization waste liquid as recited in claim 1, wherein said annular high-salt waste water supply pipe 16 is connected to a compressed air main pipe 18.
5. The recycling environmental-friendly co-disposal system for desulfurization waste liquid as recited in claim 1, wherein said waste heat concentrated discharge chimney E is a discharge chimney of a hot blast stove, a steel rolling heating furnace or a denitration flue gas heating furnace of a steel enterprise.
6. The recycling environmental-friendly co-disposal system for desulfurization waste liquid as recited in claim 1, wherein said sintering machine head ash intermediate storage bin 1 is provided with an automatic metering device.
7. The recycling, environment-friendly and cooperative disposal system for desulfurization waste liquid as recited in claim 2, wherein pipelines connected to the machine head ash preliminary dissolving tank a and the high-salinity wastewater transfer tank C are respectively disposed at two sides of the plate filter press 11.
8. The recycling environmental-friendly synergistic treatment system for the desulfurization waste liquid as claimed in claim 2, wherein control valves 10 are respectively arranged on two sides of the plate filter press 11 and between the plate filter press and the machine head ash primary dissolving tank A.
9. The recycling environmental-friendly synergistic treatment system for the desulfurization waste liquid as claimed in claim 2, wherein control valves 12 are respectively arranged on two sides of the plate-type filter press 11 and between the two sides of the plate-type filter press and the high-salinity wastewater transfer tank C.
10. A resource environment-friendly co-treatment method for desulfurization waste liquid is characterized by comprising the following steps:
dissolving the machine head ash in the desulfurization waste liquid, uniformly mixing, adding carbonate, and precipitating;
filtering the precipitated wastewater to form high-salinity wastewater;
mixing the high-salinity wastewater with compressed air, atomizing, evaporating, and collecting KCl and NaCl crystals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010059386.9A CN111170543A (en) | 2020-01-19 | 2020-01-19 | Desulfurization waste liquid recycling environment-friendly cooperative treatment system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010059386.9A CN111170543A (en) | 2020-01-19 | 2020-01-19 | Desulfurization waste liquid recycling environment-friendly cooperative treatment system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114835327A (en) * | 2022-05-31 | 2022-08-02 | 中冶赛迪工程技术股份有限公司 | Method for cooperatively treating desulfurization wastewater and sintering machine head ash |
| CN114956424A (en) * | 2022-05-31 | 2022-08-30 | 中冶赛迪技术研究中心有限公司 | Sintering machine head ash deamination method using desulfurization waste liquid treatment system |
-
2020
- 2020-01-19 CN CN202010059386.9A patent/CN111170543A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114835327A (en) * | 2022-05-31 | 2022-08-02 | 中冶赛迪工程技术股份有限公司 | Method for cooperatively treating desulfurization wastewater and sintering machine head ash |
| CN114956424A (en) * | 2022-05-31 | 2022-08-30 | 中冶赛迪技术研究中心有限公司 | Sintering machine head ash deamination method using desulfurization waste liquid treatment system |
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Application publication date: 20200519 |