CN105621514A - Salt-containing wastewater concentration treatment device with air as medium - Google Patents

Salt-containing wastewater concentration treatment device with air as medium Download PDF

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Publication number
CN105621514A
CN105621514A CN201610158397.6A CN201610158397A CN105621514A CN 105621514 A CN105621514 A CN 105621514A CN 201610158397 A CN201610158397 A CN 201610158397A CN 105621514 A CN105621514 A CN 105621514A
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air
water
water vapor
tower
temperature
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CN201610158397.6A
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张锁龙
戎铖
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Changzhou University
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Changzhou University
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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
    • C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
    • 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
    • C02F1/08—Thin film 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
    • 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
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/208—Off-grid powered water treatment
    • Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

本发明是一种新型的含盐废水浓缩处理装置。该装置由填料塔(蒸发器)、板式换热器(冷凝器)、加热模块(低品位热能、太阳能)组成，采用增湿减湿的方法，以流动的空气作为水蒸气的载体来蒸发浓缩处理含盐废水，空气在填料塔中被加热后的含盐废水增湿，携带一定量的水蒸气后，根据填料塔内不同的温度梯度，分别进入板式换热器中，经过冷凝除湿得到淡水，冷凝潜热通过预热含盐废水来进行回收。同时对填料塔内的水蒸气采用多级导出结构(一般为三级)，极大地提高了塔内热量的利用率。(结构图见说明书摘要附图)本发明的废水浓缩处理装置，解决了传统处理方法能耗高，先期投入和后期维护成本高，生产规模要求大，生产地区基础设施要求高的缺点。

The invention is a novel device for concentrating and treating salty waste water. The device consists of a packed tower (evaporator), a plate heat exchanger (condenser), and a heating module (low-grade heat energy, solar energy). It adopts the method of humidification and dehumidification, and uses the flowing air as the carrier of water vapor to evaporate and concentrate To treat saline wastewater, the air is heated in the packed tower to humidify the saline wastewater, and after carrying a certain amount of water vapor, it enters the plate heat exchanger respectively according to the different temperature gradients in the packed tower, and obtains fresh water through condensation and dehumidification , the latent heat of condensation is recovered by preheating the saline wastewater. At the same time, a multi-stage export structure (generally three stages) is adopted for the water vapor in the packed tower, which greatly improves the utilization rate of heat in the tower. (For the structural diagram, see the accompanying drawing in the abstract of the specification) The waste water concentration treatment device of the present invention solves the shortcomings of traditional treatment methods such as high energy consumption, high initial investment and later maintenance costs, large production scale requirements, and high infrastructure requirements in production areas.

Description

Air is the brine waste concentration device of medium
Technical field:
The present invention relates to and carry out concentrating to high-salt wastewater (total containing salt massfraction be 1%��3.5%) and obtain equipment and the technique thereof of fresh water, belong to the technical field of wastewater treatment, it is possible to be attributed to energy-saving and emission-reduction field.
Background technology
Fresh water belongs to basic natural resources and strategic economic resources, is the control selector of ecotope and the organic component of country's overall national strength. On the earth, only the water source of 3% can be drunk. The whole world about has the population of 25% to can not get enough fresh water, and the country more than 80% faces serious water resources shortage problem. Along with the expansion of world's arid and desertification, exacerbate the seriousness of water resources problems.
In order to tackle fresh water crisis, it is a kind of effective method that brine waste carries out concentration. Brine waste refers to always containing the inorganic salt waste water that salt massfraction is 1%��3.5%, and main source is the high-salt wastewater of seawater, underground shallow layer salt water, Industrial processes generation. Now main concentration method has multistage flash evaporation method, multiple-effect distillation, vapour compression method etc. Above-mentioned several method shortcoming mainly contain following some: 1, being consumed a large amount of electric power and fuel, on the one hand economy is poor, is unfavorable for economizing on resources on the other hand; 2, it is only suitable for scale operation, higher for cost for wastewater treatment on a small scale; 3, production unit drops into relatively big, and safeguards that these equipment needs bigger input; 4, most treatment process all needs just can carry out in area preferably in Infrastructure, is difficult in the area of poor infrastructure carry out. For the shortcoming of above several method, the wet waste water treatment process that dries that increases utilizing air to be medium in recent years obtains certain attention, this kind of method makes both waste water and carrier gas (being generally air) contact with each other, temperature and the humidity of carrier gas is improved with this, its condensation is obtained fresh water thereupon, raw material is concentrated, and condensation latent heat carries out the treatment process of effective recycling, increases the wet wastewater treatment equipment that dries and is generally made up of evaporator room, condensing chamber and heating module.
Packing tower is built with the gas-liquid mass transfer (contact) equipment of a large amount of fillers as alternate contact component taking tower. Waste water adds from tower top, pours on filler through shower nozzle spray, and flows down along filling surface. Gas is sent into from the bottom of tower, is the space that adverse current continues through filler with waste water. Surperficial gas-liquid two-phase at filler closely contacts and carries out mass transfer. Packing tower has that throughput is big, feature little, that liquid holdup is little, turndown ratio is big falls in separation efficiency height, pressure.
Plate-type heat exchanger is a kind of new type high efficient heat exchanger filled by a series of metal film stack with certain bellows-shaped. Form thin rectangular shape passage between various plate, carry out thermal exchange by plate. Plate-type heat exchanger is the ideal equipment that liquid-liquid, liquid-vapour carry out heat exchange. It has heat exchange efficiency height, thermosteresis is little, advantages of compact and light structure, floor space are little, install easy to clean, be widely used, the feature such as long service life. In uniform pressure loss situation, doubly, floor space is 1/3rd of tubular heat exchanger to its ratio of heat transfer coefficient tubular heat exchanger height 3-5, and heat recovery rate can up to more than 90%.
The present invention, using packing tower, plate-type heat exchanger as evaporator room, condensing chamber, selects suitable low grade residual heat, sun power to form sewage treatment equipment as heating module, and selects suitable working parameter according to different operating mode.
Summary of the invention
The present invention is directed to conventional concentration method consumed energy height, production cost input cost big, be unfavorable for small-scale production, need in the Infrastructure problem such as area preferably, utilize the principle increasing wet dehumidification, devise a kind of new concentration instrument and supplies.
The present invention is made up of packing tower (evaporator room), plate-type heat exchanger (condensing chamber), heating module. The technical scheme adopted is the carrier introducing flowing air as water vapour, and is separated with condensing chamber by evaporator room, and their temperature can independently be controlled; Air is increased wet in evaporator room by brine waste, enters in condensing chamber, obtain fresh water through dehumidification by condensation after carrying a certain amount of water vapour, and condensation latent heat is reclaimed by preheating brine waste. Heating module can utilize low grade residual heat and sun power to carry out energy supply. In order to obtain bigger treatment capacity, then several equipment can be carried out series connection combination producing.
The present invention is different from traditional salt-containing waste water treatment method, production cost and the treatment scale of the main flow treatment processs such as conventional treatment process such as multistage flash evaporation method, multiple-effect distillation, vapour compression method are closely related, relatively be applicable to large-scale treating processes, but these technology and be not suitable for process engineering on a small scale. And the input of purchase of equipment is relatively big in advance, and later maintenance cost is also higher. For the enterprise that some industrial scales are less, utilizing electric energy to carry out processing cost higher, particularly those have the enterprise enriching low grade residual heat, the treatment unit that urgent needs are compact simplified. Increasing the wet desalination techniques that dries and overcome an above difficult problem ingeniously, apparatus structure is simple, and does not consume fossil energy, is easy to operation and maintenance, although output is not as good as traditional method, but can carry out series connection production and supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of the brine waste concentration device of the present invention.
Number in the figure illustrates: 1-fresh water pond for recovering, 2,3,4-plate-type heat exchanger, 5-heating module, 6-packing tower, 7-shower nozzle, 8-gas blower, 9-concentrated solution outlet, 10-feed reservoir, 11-pump, 12,13-water vapour pipeline, 14,15-fluid pipeline.
Embodiment
During the device start of the present invention, water pump 11, by brine waste suction system from feed reservoir 10, leads to heating module 5 via plate-type heat exchanger 2,3,4. Raw material flows to packing tower 6 after being heated to 70��90 DEG C by heating module 5, evenly is spilt by shower nozzle 7 and forms water smoke to inner-tower filling material; Now have in tower by tower pucking blower fan 8 blow into normal temperature air. High temperature feedstock water smoke fully contacts generation mass-and heat-transfer with air on filler, and absorption of air moisture is saturated gradually by unsaturated state, and the temperature of air is in constantly uphill process simultaneously, and wettability power is also in continuous enhancing. Raw material moisture constantly evaporates and scatters and disappears and concentration rising, reaches concentrated object, is finally discharged outside tower. The air of moist high temperature enters plate-type heat exchanger 2,3,4 by the different gradient segmentations of temperature, and carries out pre-warmed raw material and carries out heat exchange, becomes liquid water, heated by the raw material waste water of normal temperature simultaneously after steam coagulation. The wet air that in tower, temperature is higher temperature after higher level's interchanger is consistent with subordinate interchanger inlet temperature and mixes, with ingress of subordinate water vapour, the heat transfer process participating in next interchanger through pipeline 13, utilizes the condensation latent heat of water vapour to greatest extent. Flow process like this, until final product obtains concentrated solution and fresh water. Water vapour produces certain negative pressure in liquefaction process simultaneously, accelerates raw materials evaporate in packing tower 6.

Claims (3)

1.空气为媒介的增湿减湿含盐废水浓缩处理装置，装置设备包括：1-淡水回收池，2、3、4-板式换热器，5-加热模块，6-填料塔，7-喷头，8-鼓风机，9-浓缩液出口，10-原料池，11-泵，12、13-水蒸气管道，14、15-液体管道。水泵11将含盐废水从原料池10中抽入系统，经由板式换热器2、3、4通向加热模块5。原料被加热模块5加热至70～90℃后流向填料塔6，通过喷头7均匀地洒向塔内填料形成水雾；此时塔内有由塔底鼓风机8吹进的常温空气。高温原料水雾在填料上与空气充分接触发生传质传热，空气吸收水分由不饱和状态而逐渐饱和，同时空气的温度在不断地上升过程中，吸水能力也在不断增强。原料水分不断蒸发散失而浓度升高，达到浓缩目的，最终被排出塔外。潮湿高温的空气按温度的不同梯度分段进入板式换热器2、3、4，与进行预加热的原料进行换热，水蒸气凝结后变成液态水，同时对常温的原料废水进行加热。塔内温度较高的湿空气经过上级换热器后温度与下级换热器进口温度一致并经管道13与下级进口处水蒸气混合参与下一换热器的换热过程，最大限度利用水蒸气的冷凝潜热。如此流程，直到最后产物得到浓缩液和淡水。同时水蒸气在液化过程中产生一定负压，加快填料塔6内原料蒸发。1. Humidification and dehumidification salty wastewater concentration treatment device with air as the medium. The equipment includes: 1-fresh water recovery tank, 2, 3, 4-plate heat exchanger, 5-heating module, 6-packed tower, 7- Nozzle, 8-blower, 9-concentrate outlet, 10-raw material pool, 11-pump, 12, 13-water vapor pipeline, 14, 15-liquid pipeline. The water pump 11 draws the saline wastewater from the raw material pool 10 into the system, and leads to the heating module 5 through the plate heat exchangers 2 , 3 , 4 . The raw material is heated to 70-90°C by the heating module 5, and then flows to the packed tower 6, and is evenly sprinkled on the packing in the tower by the nozzle 7 to form water mist; The high-temperature raw material water mist fully contacts with the air on the filler to conduct mass transfer and heat transfer, and the air absorbs water from an unsaturated state to gradually saturated. At the same time, the water absorption capacity of the air is constantly increasing as the temperature of the air continues to rise. The moisture of the raw material evaporates continuously and the concentration rises to achieve the purpose of concentration, and is finally discharged out of the tower. The humid and high-temperature air enters the plate heat exchangers 2, 3, and 4 in stages according to different temperature gradients, and exchanges heat with the preheated raw materials. The water vapor condenses and becomes liquid water, and at the same time, the raw material wastewater at room temperature is heated. The humid air with a higher temperature in the tower passes through the upper heat exchanger, and the temperature is the same as the inlet temperature of the lower heat exchanger, and is mixed with the water vapor at the inlet of the lower heat exchanger through the pipeline 13 to participate in the heat exchange process of the next heat exchanger, so as to maximize the use of water vapor latent heat of condensation. This process continues until the final product is concentrated liquid and fresh water. At the same time, the water vapor generates a certain negative pressure during the liquefaction process, which accelerates the evaporation of raw materials in the packed tower 6 . 2.根据权利1要求增湿减湿含盐废水浓缩处理装置其特征在于：填料塔6上的水蒸气导出结构为多级导出结构(一般为三级)，利用这种结构可以极大地利用塔内的热量，进而提高了水蒸气冷凝潜热的利用。2. According to the requirement of claim 1, the humidification and dehumidification salty wastewater concentration treatment device is characterized in that: the water vapor derivation structure on the packed tower 6 is a multi-stage derivation structure (generally three stages), and this structure can greatly utilize the tower The internal heat, thereby improving the utilization of the latent heat of condensation of water vapor. 3.根据权利1要求增湿减湿含盐废水浓缩处理装置其特征在于：以常温常压的空气作为水蒸气的载气媒介，该媒介来源广泛，装置运行时物理化学性质稳定可靠。3. According to claim 1, the humidification and dehumidification salty wastewater concentration treatment device is characterized in that: air at normal temperature and pressure is used as the carrier gas medium of water vapor, the medium comes from a wide range of sources, and the physical and chemical properties of the device are stable and reliable during operation.
CN201610158397.6A 2016-03-18 2016-03-18 Salt-containing wastewater concentration treatment device with air as medium Pending CN105621514A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451725A (en) * 2016-09-26 2017-02-22 常州大学 Solar energy and power-combined inorganic salt solution concentration system
CN108178218A (en) * 2018-03-21 2018-06-19 张建东 A kind of Waste water concentrating liquid stream crystallizing and drying system and method for air direct emission
CN108249497A (en) * 2018-03-21 2018-07-06 张建东 A kind of waste water airdistillation thickening-purification technology System and method for
CN109052526A (en) * 2018-08-28 2018-12-21 盛发环保科技（厦门）有限公司 Flue gas disappears white coupling high temperature bypass flue evaporation high slat-containing wastewater Zero discharging system
CN110117033A (en) * 2019-05-16 2019-08-13 河北工业大学 A kind of method and device of capillary low-temperature evaporation high slat-containing wastewater
CN110451711A (en) * 2019-08-13 2019-11-15 武汉宏澳绿色能源工程有限责任公司 A kind of system and method for realizing high-salt wastewater condensing crystallizing using air air lift
CN110540257A (en) * 2018-05-29 2019-12-06 中国科学院广州能源研究所 A coal-fired power plant desulfurization wastewater evaporation concentration and fresh water recovery device
CN112694224A (en) * 2021-01-08 2021-04-23 上海东硕环保科技股份有限公司 Zero-discharge treatment method and device for coking ammonia distillation wastewater by membrane-free process
CN113426257A (en) * 2021-06-08 2021-09-24 威海金宏科技有限公司 Wastewater recovery process and system based on low-grade heat source
CN113526594A (en) * 2021-07-31 2021-10-22 董春 Industrial wastewater desalting and desalting evaporator and desalting method

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JP2009072734A (en) * 2007-09-23 2009-04-09 Motohide Takezaki Seawater desalting apparatus using air stream circulation
WO2010063341A1 (en) * 2008-12-02 2010-06-10 Rolls-Royce Plc Desalination method
CN102205993A (en) * 2011-03-18 2011-10-05 清华大学 Adverse current closed type multistage seawater desalination system and method
CN105174332A (en) * 2015-07-16 2015-12-23 浙江大学 Method for processing garbage leachate and device thereof

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Publication number Priority date Publication date Assignee Title
JP2009072734A (en) * 2007-09-23 2009-04-09 Motohide Takezaki Seawater desalting apparatus using air stream circulation
WO2010063341A1 (en) * 2008-12-02 2010-06-10 Rolls-Royce Plc Desalination method
CN102205993A (en) * 2011-03-18 2011-10-05 清华大学 Adverse current closed type multistage seawater desalination system and method
CN105174332A (en) * 2015-07-16 2015-12-23 浙江大学 Method for processing garbage leachate and device thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451725A (en) * 2016-09-26 2017-02-22 常州大学 Solar energy and power-combined inorganic salt solution concentration system
CN108178218A (en) * 2018-03-21 2018-06-19 张建东 A kind of Waste water concentrating liquid stream crystallizing and drying system and method for air direct emission
CN108249497A (en) * 2018-03-21 2018-07-06 张建东 A kind of waste water airdistillation thickening-purification technology System and method for
CN108178218B (en) * 2018-03-21 2023-06-30 张建东 System and method for crystallizing and drying wastewater concentrate by directly discharging air
CN110540257A (en) * 2018-05-29 2019-12-06 中国科学院广州能源研究所 A coal-fired power plant desulfurization wastewater evaporation concentration and fresh water recovery device
CN109052526A (en) * 2018-08-28 2018-12-21 盛发环保科技（厦门）有限公司 Flue gas disappears white coupling high temperature bypass flue evaporation high slat-containing wastewater Zero discharging system
CN110117033A (en) * 2019-05-16 2019-08-13 河北工业大学 A kind of method and device of capillary low-temperature evaporation high slat-containing wastewater
CN110117033B (en) * 2019-05-16 2021-09-28 河北工业大学 Method and device for evaporating high-salt-content wastewater at low temperature through capillary
CN110451711A (en) * 2019-08-13 2019-11-15 武汉宏澳绿色能源工程有限责任公司 A kind of system and method for realizing high-salt wastewater condensing crystallizing using air air lift
CN112694224A (en) * 2021-01-08 2021-04-23 上海东硕环保科技股份有限公司 Zero-discharge treatment method and device for coking ammonia distillation wastewater by membrane-free process
CN113426257A (en) * 2021-06-08 2021-09-24 威海金宏科技有限公司 Wastewater recovery process and system based on low-grade heat source
CN113526594A (en) * 2021-07-31 2021-10-22 董春 Industrial wastewater desalting and desalting evaporator and desalting method

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Application publication date: 20160601