CN106673101B - Deep treatment method and system for high-salt-content desulfurization wastewater - Google Patents
Deep treatment method and system for high-salt-content desulfurization wastewater Download PDFInfo
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- CN106673101B CN106673101B CN201611233561.1A CN201611233561A CN106673101B CN 106673101 B CN106673101 B CN 106673101B CN 201611233561 A CN201611233561 A CN 201611233561A CN 106673101 B CN106673101 B CN 106673101B
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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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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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
- C02F1/043—Details
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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
- C02F1/048—Purification of waste water by 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
- C02F1/02—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
- C02F2001/5218—Crystallization
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a high-salt-content desulfurization wastewater advanced treatment system which comprises a wastewater conveying device, an air path conveying device, a heat source device, a concentrated solution and crystal recovery device and a liquid drop size measuring device, wherein the wastewater conveying device comprises a wastewater liquid storage tank and a centrifugal pump; the gas path conveying device comprises an air compressor, a mixing chamber and a nozzle; the heat source device comprises a blower and low-temperature waste heat utilization equipment; the concentrated solution and crystal recovery device comprises a drying tower, a spiral distribution slide rail, a cyclone centrifuge, a salt recovery tank, a sieve plate, a concentrated solution storage tank and a preheater; the liquid drop size measuring device comprises an observation window, a liquid drop size measuring instrument and a computer. The system integrates the functions of high-salt-content desulfurization wastewater spray evaporation, droplet size detection and concentrated solution and crystal recovery, is simple and convenient to operate, has uniform temperature distribution in a field, good evaporation effect and less operation energy consumption.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method and a system for deeply treating high-salt-content desulfurization wastewater.
Background
Coal accounts for about 66% of primary energy consumption in China, the total coal consumption amount is about 37 hundred million tons, and the coal consumption amount accounts for about 50% of the global coal consumption amount. 70 percent of national smoke dust emission, 85 percent of sulfur dioxide emission and 67 percent of nitrogen oxide emission are all from fossil energy combustion mainly comprising coal, and are main factors influencing the quality of atmospheric environment.
The limestone-gypsum method and ammonia method are the most widely used desulfurization processes in petrochemical enterprises, and the produced wastewater contains a large amount of heavy metal ions and solid suspended matters, and is directly discharged to cause extremely strong pollution to the environment.
The conventional desulfurization wastewater mainly adopts a chemical precipitation method, but can not effectively remove chloride ions and sulfate ions in the wastewater and can not realize ultralow emission. Other treatment methods include nanofiltration membranes to retain dissolved salts in wastewater, but because membranes are extremely prone to contamination and are relatively costly, they have not been widely used; the direct combustion method produces less waste, but is only suitable for the case of low water content and large amount of combustible components in water.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a system for deeply treating high-salt-content desulfurization wastewater.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The deep treatment method and the system for the high-salt-content desulfurization wastewater are characterized by comprising five parts, namely a wastewater conveying device, an air path conveying device, a heat source device, a concentrated solution and crystal recovery device and a liquid drop size measuring device, wherein the wastewater conveying device, the air path conveying device, the heat source device, the concentrated solution and crystal recovery device are connected with a valve through pipelines, and the wastewater conveying device comprises a wastewater liquid storage tank 1 and a centrifugal pump 2; the gas path conveying device comprises an air compressor 7, a mixing chamber 5 and a nozzle 6; the heat source device comprises an air blower 8 and low-temperature waste heat utilization equipment 9; the concentrated solution and crystal recovery device comprises a drying tower 12, a spiral distribution slide rail 13, a cyclone centrifuge 14, a salt recovery tank 17, a sieve plate 21, a concentrated solution storage tank 22 and a preheater 25; the liquid drop size measuring device comprises an observation window 18, a liquid drop size measuring instrument 19 and a computer 20;
further, the waste water liquid storage tank 1 is connected with the centrifugal pump 2 through a pipeline; the output pipeline of the centrifugal pump 2 comprises a glass rotameter 3 and a pressure gauge 4; the mixing chamber 5 ensures the thorough mixing of the desulfurization wastewater and the air;
further, the air compressor 7 is connected with the mixing chamber 5 through a pipeline, and generates the desulfurization wastewater mist through the nozzle 6 after fully mixing by adjusting the gas-liquid ratio of the compressed air and the desulfurization wastewater;
further, the low-temperature waste heat utilization equipment 9 directly utilizes a heat exchanger to heat air or utilizes a mechanical compression heat pump and an absorption heat converter to recover the waste heat of the industrial waste gas to heat the air and reduce energy consumption; the low-temperature waste heat utilization equipment 9 supplies air through the blower 8 and is connected with the gas flowmeter 10, the gas flowmeter 10 is connected with the heat source incidence end 11, and the heat source incidence end 11 supplies hot air in a circular tangent mode to generate spirally rising heat flow;
further, the spirally distributed slide rails 13 are connected with the nozzle 6 by using a spherical clamp embedded in the slide rails, and the desulfurization wastewater mist generated by the nozzle is evaporated in the drying tower 12; the steam at the outlet of the upper end of the drying tower 12 is stabilized in pressure through a buffer 24, the buffer 24 is connected with a preheater 25, the preheater 25 heats the stock solution pumped out by the centrifugal pump 2, and the preheater 25 is connected with a reuse water storage tank 26; the lower end of the drying tower 12 is separated into concentrated solution and salt through a sieve plate 21, evaporated crystal salt particles falling under the action of gravity are separated through a cyclone centrifuge 14, and the salt particles are collected into a salt recovery tank 17 through a discharge valve 16; concentrated solution filtered by the sieve plate 21 flows into a concentrated solution storage tank 22 through a conical outlet at the bottom of the drying tower, and is led back to the wastewater storage tank 1 through a circulating pump 23 for circulating treatment;
furthermore, the nozzles 6 can freely adjust the working positions through the spiral distribution slide rails 13, and can realize upward and downward spraying in the same direction or the opposite direction to the upward direction of the flow direction of the spiral rising heat flow, so that the temperature field in the tower is uniformly distributed, the heat source is fully utilized, the distance between the nozzles is 0.4m, and the number of the nozzles 6 depends on the treatment capacity of the desulfurization wastewater and the flow rate of the hot air; the spirally distributed sliding rails 13 comprise fluoroplastic, stainless steel and a corrosion-resistant composite material, and the nozzles on the spirally distributed sliding rails 13 are arranged in a vertically staggered manner;
further, one end of the droplet size measuring instrument 19 is connected with the observation window 18, the other end is connected with the computer 20, and the observation window 18 is used for observing the macroscopic effect of droplet atomization; the liquid drop size measuring instrument 19 adopts a Laser Doppler (LDV) system or a high-speed camera to measure the diameter and the distribution of liquid drops, the size of the liquid drops is controlled to be below 50 mu m by adjusting the gas-liquid ratio of the air compressor 7 entering the mixing chamber 5 and the size of the atomized liquid drops of the nozzle; the computer (20) analyzes and processes data used by the meter.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow diagram of a method and a system for deeply treating high-salinity desulfurization wastewater.
In the figure 1, a waste water storage tank, 2, a centrifugal pump, 3, a glass rotameter, 4, a pressure gauge, 5, a mixing chamber, 6, a nozzle, 7, an air compressor, 8, a blower, 9, low-temperature waste heat utilization equipment, 10, a gas flowmeter, 11, a heat source incidence end, 12, a drying tower, 13, a spiral distribution slide rail, 14, a cyclone centrifuge, 15, an induced draft fan, 16, a discharge valve, 17, a salt recovery tank, 18, an observation window, 19, a liquid drop size measuring instrument, 20, a computer, 21, a sieve plate, 22, a concentrated solution storage tank, 23, a circulating pump, 24, a buffer tank, 25, a preheater, 26 and a condensed water storage tank are arranged.
Detailed Description
In fig. 1, a waste water reservoir 1 is connected with a centrifugal pump 2 through a pipeline; and (3) opening the centrifugal pump 2, adjusting the liquid inlet flow through the readings of the glass rotameter 3 and the pressure gauge 4, and allowing the liquid inlet flow to enter a mixing chamber 5 for fully mixing the desulfurization wastewater and the air. Starting the air compressor 7, and adjusting the gas-liquid ratio of the compressed air to the desulfurization wastewater to be 2: 1, after fully mixing, generating desulfurization waste water mist through a nozzle 6.
And starting the air blower 8 and the low-temperature waste heat utilization equipment 9, wherein the low-temperature waste heat utilization equipment 9 directly utilizes a heat exchanger to heat air or utilizes a mechanical compression type heat pump and an absorption type heat exchanger to recover industrial waste gas waste heat, heats air and reduces energy consumption. Air sent by the air blower 8 is heated by the low-temperature waste heat utilization equipment 9, the air inflow is adjusted by the gas flowmeter 10, and the air enters the drying tower from the heat source incidence end 11 in a circular tangent mode to generate spiral rising heat flow to heat and evaporate waste liquid mist.
Uniformly mixed gas and liquid are sprayed out of a nozzle 6, the position of the nozzle 6 is fixed through a spirally-distributed sliding rail 13 and a spherical clamp embedded in the sliding rail, the desulfurization wastewater mist generated by the nozzle is evaporated in a drying tower 12, the gas containing a small amount of salt particles is treated at an outlet at the upper end of the drying tower 12 and is separated through a cyclone centrifuge 14, the gas is pumped away through a draught fan 15, and the small amount of salt particles are collected in a salt recovery tank 17; the lower end of the drying tower 12 separates the concentrated solution and the salt through a sieve plate 21, evaporated crystal salt particles falling under the action of gravity are separated through a cyclone centrifuge 14, and the salt particles are collected into a salt recovery tank 17 through a discharge valve 16; the concentrated solution filtered by the sieve plate 21 passes through a conical outlet at the bottom of the drying tower, flows into a concentrated solution storage tank 22, and is guided back to the wastewater storage tank 1 through a circulating pump 23 for circulating treatment.
In the specific implementation, the distance between the nozzles is 0.4m, and the number of the nozzles 6 depends on the treatment capacity of the desulfurization wastewater and the flow of hot air; the spirally distributed sliding rails 13 comprise fluoroplastic, stainless steel and corrosion-resistant composite materials, and the arrangement mode of the nozzles on the spirally distributed sliding rails 13 is that the nozzles are arranged in a vertically staggered mode.
And starting the liquid drop size measuring instrument 19, wherein one end of the liquid drop size measuring instrument 19 is connected with the observation window 18, the other end of the liquid drop size measuring instrument 19 is connected with the computer 20, and the observation window 18 is used for observing the macroscopic effect of liquid drop atomization. The droplet size measuring instrument 19 measures the diameter and distribution of droplets by using a Laser Doppler (LDV) system or a high-speed camera, the droplet size is controlled to be below 50 mu m by adjusting the gas-liquid ratio of the air compressor 8 entering the mixing chamber 5 and the size of the atomized droplets colliding with the nozzle, and the computer 20 analyzes and processes the data used by the measuring instrument.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. The deep treatment system for the high-salt-content desulfurization wastewater is characterized by comprising five parts, namely a wastewater conveying device, an air path conveying device, a heat source device, a concentrated solution and crystal recovery device and a liquid drop size measuring device, wherein the wastewater conveying device, the air path conveying device, the heat source device, the concentrated solution and crystal recovery device are connected with a valve through pipelines, and the wastewater conveying device comprises a wastewater liquid storage tank (1) and a centrifugal pump (2); the air path conveying device comprises an air compressor (7), a mixing chamber (5) and a nozzle (6); the heat source device comprises a blower (8) and low-temperature waste heat utilization equipment (9); the concentrated solution and crystal recovery device comprises a drying tower (12), a spiral distribution slide rail (13), a cyclone centrifuge (14), a salt recovery tank (17), a sieve plate (21), a concentrated solution storage tank (22) and a preheater (25); the liquid drop size measuring device comprises an observation window (18), a liquid drop size measuring instrument (19) and a computer (20);
the waste water liquid storage tank (1) is connected with the centrifugal pump (2) through a pipeline; the output pipeline of the centrifugal pump (2) comprises a glass rotameter (3) and a pressure gauge (4); the mixing chamber (5) ensures the thorough mixing of the desulfurization wastewater and the air;
the air compressor (7) is connected with the mixing chamber (5) through a pipeline, and desulfurization wastewater mist is generated through the nozzle (6) after full mixing by adjusting the gas-liquid ratio of compressed air and desulfurization wastewater;
the low-temperature waste heat utilization equipment (9) directly utilizes a heat exchanger to heat air or utilizes a mechanical compression heat pump and an absorption heat converter to recover the waste heat of the industrial waste gas, so as to heat the air and reduce the energy consumption; the low-temperature waste heat utilization equipment (9) supplies air through the air blower (8) and is connected with the gas flowmeter (10), the gas flowmeter (10) is connected with the heat source incidence end (11), and the heat source incidence end (11) supplies hot air in a circular tangent mode to generate spirally rising heat flow;
the spiral distribution slide rail (13) is connected with the nozzle (6) by utilizing a spherical clamp embedded into the slide rail, and the desulfurization wastewater mist generated by the nozzle is evaporated in the drying tower (12); the steam at the outlet of the upper end of the drying tower (12) is stabilized through a buffer (24), the buffer (24) is connected with a preheater (25), the preheater (25) heats the stock solution pumped out by the centrifugal pump (2), and the preheater (25) is connected with a reuse water storage tank (26); the lower end of the drying tower (12) is separated into concentrated solution and salt through a sieve plate (21), evaporated crystal salt particles falling by the action of gravity are separated through a cyclone centrifuge (14), and the salt particles are collected to a salt recovery tank (17) through a discharge valve (16); concentrated solution filtered by the sieve plate (21) flows into a concentrated solution storage tank (22) through a conical outlet at the bottom of the drying tower, and is guided back to the wastewater storage tank (1) through a circulating pump (23) for circulating treatment;
the working position of the nozzles (6) can be freely adjusted through the spiral distribution slide rails (13), the upward and downward spraying in the direction tangential to the flow direction of the spiral rising heat flow can be realized, the temperature field in the tower is uniformly distributed, a heat source is fully utilized, the distance between the nozzles is 0.4m, and the number of the nozzles (6) depends on the treatment capacity of the desulfurization wastewater and the flow of hot air; the spirally distributed sliding rails (13) comprise fluoroplastic, stainless steel and a corrosion-resistant composite material, and the nozzles on the spirally distributed sliding rails (13) are arranged in a vertically staggered manner;
one end of the liquid drop size measuring instrument (19) is connected with the observation window (18), the other end of the liquid drop size measuring instrument is connected with the computer (20), and the observation window (18) is used for observing the macroscopic effect of liquid drop atomization; the liquid drop size measuring instrument (19) adopts a Laser Doppler (LDV) system or a high-speed camera to measure the diameter and the distribution of liquid drops, the size of the liquid drops is controlled to be below 50 mu m by adjusting the gas-liquid ratio of the liquid drops entering the mixing chamber (5) through the air compressor (7) and adjusting the size of the atomized liquid drops of the nozzle; the computer (20) analyzes and processes data used by the meter.
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| CN107445229A (en) * | 2017-08-05 | 2017-12-08 | 周维民 | A kind of feces of livestock and poultry penetrating fluid reclaims enrichment facility |
| CN110550682B (en) * | 2018-05-30 | 2022-04-12 | 中国科学院广州能源研究所 | Small-size waste water concentration system |
| CN109336203A (en) * | 2018-11-26 | 2019-02-15 | 广东威特宝土壤修复科研中心有限公司 | Waste water evaporation process system and the processing system that water is evaporated by change water quality |
| CN109557062A (en) * | 2018-12-10 | 2019-04-02 | 徐州工程学院 | A kind of desulfurization wastewater drop evaporation test device and test method |
| CN110420471A (en) * | 2019-08-18 | 2019-11-08 | 天津格林泰格科技有限公司 | A kind of energy saving vapo(u)rization system for liquid evaporation |
| CN111087034B (en) * | 2019-12-12 | 2022-02-22 | 西安交通大学 | Desulfurization waste water and salt recovery system and method of integrated absorption heat pump |
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| CN105460993A (en) * | 2016-01-13 | 2016-04-06 | 大连科林能源工程技术开发有限公司 | Dry environment-friendly treating and solid salt recycling system for high-concentration salt-containing waste water |
| CN106145228A (en) * | 2016-09-08 | 2016-11-23 | 国投百川环保科技（北京）有限公司 | The two-part vaporising device of desulfurization wastewater and processing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105460993A (en) * | 2016-01-13 | 2016-04-06 | 大连科林能源工程技术开发有限公司 | Dry environment-friendly treating and solid salt recycling system for high-concentration salt-containing waste water |
| CN106145228A (en) * | 2016-09-08 | 2016-11-23 | 国投百川环保科技（北京）有限公司 | The two-part vaporising device of desulfurization wastewater and processing method thereof |
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