CN212334914U - Waste water concentration system based on air humidification and dehumidification - Google Patents
Waste water concentration system based on air humidification and dehumidification Download PDFInfo
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- CN212334914U CN212334914U CN202020832151.4U CN202020832151U CN212334914U CN 212334914 U CN212334914 U CN 212334914U CN 202020832151 U CN202020832151 U CN 202020832151U CN 212334914 U CN212334914 U CN 212334914U
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Abstract
The utility model relates to a waste water concentration system based on air dehumidification, the humidification tower is equipped with water-locator, packing bed and tower bottom air distribution dish, and concentrate circulation pipeline one end is connected with the water-locator and communicates with each other, and the other end is connected with cold side heat transfer mouth B and communicates with each other, connects gradually concentrate elevator pump, heat main heat exchanger and first auxiliary heat exchanger on the concentrate circulation pipeline; the dehumidification tower is provided with a dehumidification air outlet E, a water distributor and a packing bed layer, one end of a clear liquid circulation pipeline is connected and communicated with the water distributor, the other end of the clear liquid circulation pipeline is connected and communicated with a hot-side heat exchange port D, a clear liquid lifting pump, a main heat exchanger and a second auxiliary heat exchanger are sequentially connected to the clear liquid circulation pipeline, one end of an inter-tower pipeline is connected and communicated with the humidification tower, the other end of the inter-tower pipeline is connected and communicated with the dehumidification tower, one end of the air circulation pipeline is connected and communicated with the dehumidification air outlet E of the dehumidification tower, and the other end of the. The utility model discloses the running energy consumption is little, reduces treatment cost low, can improve waste water concentration efficiency.
Description
Technical Field
The utility model relates to a concentrated system of waste water based on air increases wet, dehumidification belongs to the concentrated processing field of waste water, especially relates to permeate film concentrate and carries out innocent treatment.
Background
The currently widely used method for treating leachate is a Membrane Bioreactor (MBR) method, and the leachate after biochemical treatment enters a nanofiltration/reverse osmosis membrane integrated device for advanced treatment, and the treatment method can produce 10-30% of membrane concentrated solution. At present, the methods for treating the membrane concentrated solution are not many, and the typical process is an evaporation process, which mainly comprises an immersion combustion treatment technology (SCE) and a vapor recompression evaporation treatment technology (MVR/MVC): the SCE treatment technology is that high-temperature flue gas generated by burning methane and air is directly sprayed into concentrated solution and is heated and evaporated in a direct contact heat transfer mode. The MVR/MVC processing technology is an energy-saving technology which utilizes secondary steam generated by an evaporation system and energy thereof to compress and apply work through a steam compressor and improve heat energy of the secondary steam, and the heat is circularly supplied to a concentrated solution evaporation system, so that the requirement on external energy can be reduced.
The existing evaporation treatment technology needs the concentrated solution to be in a boiling state, so the concentrated solution needs to be operated under the condition of higher temperature, or the concentrated solution needs to be operated under the condition of reducing the boiling temperature of the concentrated solution under the condition of keeping a certain vacuum degree, so a large amount of energy needs to be consumed, the concentration treatment cost is high, and the application of the prior art is limited. The SCE treatment technology can only be applied to landfill sites with garbage anaerobic fermentation capacity or disposal sites with natural gas supply conditions, and the application is restricted but not popularized. Some concentration systems utilize hot air pressure swing circulation to concentrate wastewater, but the concentration systems need to be provided with a hot compression unit and an expansion unit to carry out air treatment, and the problems of high operation energy consumption, high treatment cost and low concentration treatment efficiency of the systems also exist.
Moreover, because the membrane concentrate often contains extremely high TDS and other pollutants, for example, a large amount of chloride ions contained in the membrane concentrate increase the risk of equipment corrosion under high temperature conditions, and because the membrane concentrate contains high-hardness ions, the scaling problem is particularly serious under the working condition of severe evaporation, and the equipment operation stability is poor.
Disclosure of Invention
The utility model aims at providing an operating energy consumption is little, reduces treatment cost and hangs down, improves waste water concentration efficiency, and system operation is reliable and stable, uses not to receive the restriction, and the waste water concentration system based on air dehumidification, dehumidification of being convenient for popularize and apply.
The utility model discloses a technical scheme who reaches above-mentioned purpose is: the utility model provides a concentrated system of waste water based on air is humidified, is dehumidified which characterized in that: comprises a humidifying unit, a dehumidifying unit, a dry and wet air circulating unit and a heat exchange unit;
the humidifying unit is used for concentrating and circulating wastewater and comprises a humidifying tower and a concentrated solution circulating pipeline, a water distributor is arranged at the upper part of the humidifying tower, a tower bottom gas distribution disc is arranged at the lower part of the humidifying tower, a packing bed layer used for increasing the contact area of a liquid phase and a gas phase is arranged between the water distributor and the tower bottom gas distribution disc of the humidifying tower, a wastewater inlet A and a cold side heat exchange port B are sequentially and downwards arranged at the lower part of the tower bottom gas distribution disc of the humidifying tower, one end of the concentrated solution circulating pipeline is communicated with the water distributor in the humidifying tower, and the other end of the concentrated solution circulating pipeline is communicated with the cold;
the dehumidification unit is used for dehumidifying and circulating air and comprises a dehumidification tower and a clear liquid circulation pipeline, wherein a water distributor is arranged at the upper part of the dehumidification tower, a dehumidification air outlet E is arranged at the top part of the dehumidification tower, a packing bed layer used for increasing the contact area of a liquid phase and a gas phase is arranged at the lower part of the water distributor of the dehumidification tower, a clear liquid water inlet C and a hot side heat exchange port D are sequentially and downwards arranged at the lower part of the dehumidification tower, one end of the clear liquid circulation pipeline is communicated with the water distributor in the dehumidification tower, and the other end of the clear liquid circulation pipeline is communicated with the hot side;
the dry and wet air circulation unit is used for closed air circulation of the humidifying tower and the dehumidifying tower and comprises an inter-tower fan and an air circulation pipeline, the inter-tower fan is arranged on the inter-tower pipeline, one end of the inter-tower pipeline is connected and communicated with the humidifying tower, the other end of the inter-tower pipeline is connected and communicated with the dehumidifying tower, one end of the air circulation pipeline is connected and communicated with a dehumidifying air outlet E of the dehumidifying tower, and the other end of the air circulation pipeline is connected and communicated with a tower bottom air distribution disc of the humidifying tower;
the heat exchange unit comprises a main heat exchanger, a first auxiliary heat exchanger and a second auxiliary heat exchanger, a concentrated liquid lifting pump, a heat main heat exchanger and a first auxiliary heat exchanger which are used for heat exchange step by step are sequentially connected to a concentrated liquid circulating pipeline, a clear liquid lifting pump, a main heat exchanger and a second auxiliary heat exchanger which are used for heat exchange step by step are sequentially connected to a clear liquid circulating pipeline, waste water in the concentrated liquid circulating pipeline and clear liquid in the clear liquid circulating pipeline exchange heat once in the main heat exchanger, and a super concentrated liquid discharge pipe is further connected to the front side of the heat main heat exchanger through the concentrated liquid circulating pipeline.
The utility model adopts a humidifying unit, a dehumidifying unit, a dry-wet air circulating unit and a heat exchange unit, wherein the humidifying unit adopts a humidifying tower and a concentrated liquid circulating pipeline communicated with the humidifying tower to continuously carry out concentrated circulation on waste water, the dehumidifying unit adopts a dehumidifying tower and a clear liquid circulating pipeline communicated with the dehumidifying tower to continuously carry out dehumidifying circulation on wet hot air entering the tower, filler beds for increasing the contact area of liquid phase and gas phase are arranged in the humidifying tower and the dehumidifying tower, the dehumidified air enters the humidifying tower to carry out mass transfer with the waste water on the surface of the filler bed, the moisture in the waste water is brought into the air to obtain the wet hot air and the concentrated liquid, the wet hot air is pumped into the filler bed of the dehumidifying tower by an inter-tower fan, the mass transfer and heat transfer are carried out on the surface of the filler bed and the clear liquid, the water vapor in the wet air reaches a condensation dew point and is separated out and enters the clear liquid, therefore, the heat loss is less, most of heat is transferred into clean clear liquid, and then the heat is exchanged with waste water newly entering the system, so that the running energy consumption is greatly saved. The utility model discloses an independent humidification tower and dehumidification tower need not to promote the liquid phase temperature, and the liquid evaporation can go on under the ordinary pressure operating mode and the temperature that is less than the boiling point, improves waste water concentration efficiency, and the system operation is reliable and stable, uses not receiving the restriction, and the facilitate promotion is used. The utility model discloses a dry humid air circulation unit adopts fan and air circulation pipeline between the tower, makes the humidification tower form closed dry humid air circulation with the dehumidification turriform, only adopts the tower between the fan constantly take out damp hot air in the dehumidification tower, need not hot compression unit and expansion unit, and the operation energy consumption is low, effectively reduces treatment cost. The utility model discloses a heat transfer unit adopts main heat exchanger, first auxiliary heat exchanger and the auxiliary heat exchanger of second, and waste water in the concentrate circulating line and the clear liquid in the clear liquid circulating line carry out a heat transfer in main heat exchanger, has saved required energy when the waste water heating again when the waste water temperature risees, and the clear liquid makes follow-up cooling step comparatively rapidly again when its temperature reduces, has not only practiced thrift the quantity of cooling water, also can improve the evaporation efficiency of system. The utility model discloses the waste water through a heat transfer gets into auxiliary heat exchanger and carries out the secondary heat transfer with the useless waste heat of industry as the heat source, reaches the required temperature of system, has further reduced the operation energy consumption of system. The utility model has compact and reasonable structure, small operation energy consumption and low processing cost.
Drawings
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is the utility model discloses concentrated system of waste water's structural schematic based on air increases wet, dehumidification.
Fig. 2 is a schematic structural view of the water distributor of the present invention.
Fig. 3 is a schematic view of the porous water distribution ring pipe structure of the water distributor of the present invention.
Fig. 4 is a schematic structural view of a one-level sieve pore water distribution plate of the water distributor of the utility model.
Fig. 5 is a schematic structural view of a second-stage sieve pore water distribution plate of the water distributor of the utility model.
Wherein: 1-a humidifying tower, 2-a water distributor, 2-1-a porous water distribution ring pipe, 2-11-a spray header, 2-12-a pipe ring, 2-13-an intermediate communicating pipe, 2-a first-stage sieve pore water distribution plate, 2-3-a second-stage sieve pore water distribution plate, 3-an air circulation pipeline, 4-a concentrated liquid circulation pipeline, 5-a clear liquid circulation pipeline, 6-an inter-tower pipeline, 7-an inter-tower fan, 8-a dehumidifying tower, 9-a packing bed layer, 10-an air distribution disc, 11-a tower bottom air distribution disc, 12-a pretreatment unit, 13-a cooling water tower, 14-a filter, 15-a concentrated liquid lifting pump, 16-a concentrated liquid discharge pipe row, 17-a second auxiliary heat exchanger, 18-a dryer, 19-a main heat exchanger, 20-a clear liquid lifting pump and 21-a first auxiliary heat exchanger.
Detailed Description
See fig. 1 and show, the utility model relates to a concentrated system of waste water based on air increases wet, dehumidification, including humidification unit, dehumidification unit and dry humid air circulation unit and heat transfer unit.
As shown in figure 1, the utility model discloses a humidification unit is used for the concentrated circulation of waste water, including humidification tower 1 and concentrate circulating line 4, concentrate circulating line 4 can adopt economic, the extensive polymeric polymer's of availability pipe fitting, can prevent the corrosive action of waste water especially concentrate to the system pipe. See fig. 1, the utility model discloses humidification tower 1 upper portion is equipped with water-locator 2, the lower part is equipped with tower bottom gas distribution dish 11, can water distribution to the packing bed 9 in humidification tower 1 evenly through water-locator 2, and the lower part in humidification tower 1 can be let in the air after the dehumidification to the gas distribution dish 11 at the bottom of the tower, humidification tower 1 is equipped with the packing bed 9 that is used for increasing liquid phase and gaseous phase area of contact between water-locator 2 and the gas distribution dish 11 at the bottom of the tower, this packing bed 9 is the multilayer that the individual layer or interval set up, packing bed 9 is for filling has a plurality of pall ring to pack, or a plurality of raschig ring packs, or a plurality of saddle ring type packs, increase the area of contact of waste water and mobile air through the packing bed 9 that is filled with a large amount of light regular packing, carry out abundant mass transfer heat, bring the moisture in the waste water into the dry. See fig. 1 and show, the utility model discloses humidifying tower 1 is located the lower part of tower bottom gas distribution dish 11 and is equipped with waste water import A and cold side heat transfer mouth B downwards in proper order, and cold side heat transfer mouth B can set up in humidifying tower 1 bottom, and the one end of dense liquid circulation line 4 is connected with water distributor 2 in humidifying tower 1 and is communicated with each other, and the other end is connected with cold side heat transfer mouth B and communicates with each other, can constantly concentrate the waste water that gets into humidifying tower 1 and flow into bottom circulation of the tower.
It is shown in the figure 1, the utility model discloses the waste water import A of humidifying tower 1 communicates with each other with waste water inlet tube connected, and waste water inlet tube communicates with each other with the delivery port of pretreatment unit 12 connected, and this pretreatment unit 12 is arranged in getting rid of the hardness ion in the waste water and preheats waste water, can adopt to have now with adjusting pH value, increase calcium magnesium hardness ion in methods such as electric charge or electromagnetism and get rid of the water, especially to the membrane concentrate, the degradation of calcium magnesium hardness ion to processing system under the better reduction high temperature condition, the utility model discloses preheat waste water at the preliminary treatment stage, make the waste water temperature that enters into humidifying tower 1 at 30 ℃ -40 ℃, and reduce the heat demand of concentrated system.
See fig. 1 and show, the utility model discloses a dehumidification unit is used for the circulation that dehumidifies to the air, including dehumidification tower 8 and clear liquid circulating line 5, clear liquid circulating line 5 can adopt ordinary carbon steel material plus spraying layer, and this spraying layer is chemical resistance, the high molecular organic coating that thermal stability is strong, functional group stability is strong, can greatly reduced the cost of material. See fig. 1, the utility model discloses dehumidification tower 8 upper portion is equipped with water-locator 2, the top is equipped with dehumidification air outlet E, dehumidification tower 8 is equipped with the bed of packing 9 that is used for increasing liquid phase and gas phase area of contact in the lower part of water-locator 2, the utility model discloses bed of packing 9 in the dehumidification tower 8 is the multilayer that individual layer or interval set up, bed of packing 9 is for packing a plurality of pall ring packings, raschig ring packing or saddle ring type packing, increase the area of contact of clear liquid and the hot humid air that flows through being filled with a large amount of light regular packing and carry out abundant mass transfer heat transfer, reach saturated dew point when the hot air that wets, gaseous steam in the air condenses into liquid water droplet, the water droplet that increases gradually flows to the bottom and gathers in the bottom because of gravity factor from the tower body top layer, and the air after the dehumidification rises to the top of the tower in the same direction as the tower body, to the air dehumidification circulation of air, dry air is carried to humidification tower 1 in the gas distribution dish Form air cycle, consequently the utility model discloses a liquid evaporation can go on under the ordinary pressure operating mode and the temperature that is less than the boiling point, and during most heat was transmitted to clean clear liquid, carries out the heat transfer with the waste water of new entering system afterwards, and calorific loss is less, saves the running energy consumption. It is shown in fig. 1 that the utility model discloses dehumidification tower 8's lower part is equipped with clear liquid water inlet C and hot side heat transfer mouth D downwards in proper order, adds dehumidification tower 8 lower part with the clear liquid through clear liquid water inlet C to satisfy system operation requirement, and hot side heat transfer mouth D can set up in dehumidification tower 8's bottom, and the one end of clear liquid circulation pipeline 5 is connected with water distributor 2 in dehumidification tower 8 and is communicated with each other, the other end is connected with hot side heat transfer mouth D and communicates with each other, constantly dehumidifies the hot air of the moisture that carries out dehumidification tower 8.
As shown in figures 1 and 2, the water distributor 2 of the utility model comprises a porous water distribution ring pipe 2-1 and a first-level sieve pore water distribution plate 2-2 arranged at the lower part of the porous water distribution ring pipe 2-1, wherein a plurality of spray heads 2-11 are evenly distributed on the porous water distribution ring pipe 2-1, and the quantity of water outlets on the first-level sieve pore water distribution plate 2-2 is larger than the quantity of the spray heads 2-11 on the porous water distribution ring pipe 2-1, the utility model discloses a ring pipe sieve plate carries out water distribution step by step, and the fluid coming from the upper porous water distribution ring pipe 2-1 carries out water distribution on the first-level sieve pore water distribution plate 2-2, thereby effectively slowing down the impact speed of the fluid to be distributed, enlarging the flow path area, being beneficial to the uniform wetting of the bed layer filler, simultaneously being capable of reducing the impact load of the fluid on the filler surface, protecting, Rapid water distribution, strong anti-scaling property and the like. As shown in figures 2 and 3, the porous water distribution ring pipe 2-1 of the utility model comprises at least more than two pipe rings 2-12 with different sizes and an intermediate communicating pipe 2-13, 2-12 circular or rectangular pipe rings can be adopted, 3-5 rings can be arranged on the 2-12 pipe rings, the distance between the rings is 150-210 mm, the pipe rings 2-12 are communicated with each other by at least two intermediate communicating pipes 2-13, and the pipe section extending outwards of the intermediate communicating pipe 2-13 is arranged at the interface, the diameter of the water outlet hole on the first-stage sieve pore water distribution plate 2-2 is less than or equal to the diameter of the water outlet hole of the spray header 2-11, water outlets which can be symmetrically distributed along the axis of the pipe rings 2-12, for example, 4-16 water outlets are arranged on each pipe ring 2-12, and the water outlet caliber of the spray header 2-11 is 25-30 mm, and the water flows out to the lower-layer first-stage sieve pore water distribution plate 2-2 for primary water distribution. The utility model discloses a one-level sieve mesh water distribution plate 2-2 can adopt the matrix cloth hole, and its aperture is at 20 ~ 25mm, the hole pitch is at 80 ~ 90mm, can be according to tower body size adjustment. As shown in figures 2-4, the water distributor 2 of the utility model also has a second-level sieve pore water distribution plate 2-3 positioned at the lower part of the first-level sieve pore water distribution plate 2-2, the first-level sieve pore water distribution plate 2-2 and the second-level sieve pore water distribution plate 2-3 can be detachably installed on the tower, the aperture of the water outlet hole on the second-level sieve pore water distribution plate 2-3 is smaller than that of the water outlet hole on the first-level sieve pore water distribution plate 2-2, and the water outlet hole on the second-level sieve pore water distribution plate 2-3 is staggered with the water outlet hole on the first-level sieve pore water distribution plate 2-2, the second-level sieve pore water distribution plate 2-3 can adopt matrix type distribution holes, the aperture is 10-15 mm, the hole distance is 80-90 mm, the fluid after water distribution falls to the second-level sieve pore water distribution plate 2-, the flow velocity of the fluid after the secondary water distribution is slower, the flow is thinner and the distribution is more uniform, thereby being beneficial to carrying out sufficient mass and heat transfer with the air.
See fig. 1, the utility model discloses dry humid air circulation unit is used for humidifying tower 1 and dehumidification tower 8's closed air circulation, fan 7 and air circulation pipeline 3 between the tower, fan 7 is installed on pipeline 6 between the tower, and pipeline 6's one end communicates with each other with humidifying tower 1 is connected, the other end communicates with each other with dehumidification tower 8 is connected between the tower, can adopt fan 7 between a tower or a plurality of tower fan 7, the utility model discloses be equipped with gas distribution dish 10 in dehumidification tower 8, can connect pipeline 6's the other end between the tower on gas distribution dish 10, constantly with humid hot-air suction dehumidification tower 8 in through fan 7 between the tower. As shown in figure 1, the utility model discloses the one end of air cycle pipeline 3 is connected with dehumidification air outlet E of dehumidification tower 8 and is communicated with each other, and the other end is connected with tower bottom gas distribution dish 11 and is communicated with each other, and the dry air after 8 dehumidifies of dehumidification tower lets in humidification tower 1 through tower bottom gas distribution dish 11 and carries out air cycle. The utility model discloses a gas distribution dish 11 at the bottom of the tower can adopt current gas distribution dish, evenly lay the air after the dehumidification in to humidification tower 1 through gas distribution dish 11 at the bottom of the tower.
See fig. 1 and show, the utility model discloses pipeline 6 is connected with a plurality of parallelly connected branch pipes at 7 rear portions of interbed fan, dehumidification tower 8 still is equipped with gas distribution dish 10 in the lower part of the bed of packing 9 that corresponds, this gas distribution dish 10 adopts current gas distribution dish, a plurality of branch pipes are connected with each other with the gas distribution dish 10 that corresponds separately, evenly lay damp and hot air in to dehumidification tower 8 through the gas distribution dish, available interbed fan 7 constantly takes out damp and hot air to dehumidification tower 8 in, carry out mass transfer heat transfer with the clear liquid in each bed of packing 9, further increase the area of contact of clear liquid and damp and hot air, promote evaporation efficiency. The utility model discloses a pipeline 6 is a plurality of between the tower, can adopt pipeline 6 between 3 ~ 10 towers, install fan 7 between the tower that corresponds on the pipeline 6 between each tower, dehumidification tower 8 still is equipped with air distribution dish 10 in the lower part that corresponds packing bed layer 9 separately, the one end of pipeline 6 is separated by and is connected on increasing the wet tower between each tower, the other end is connected with air distribution dish 10 that corresponds separately and communicates with each other, in fan 7 constantly takes out the damp hot air to dehumidification tower 8 between a plurality of towers, carry out mass transfer heat transfer with the clear solution in each packing bed layer 9, and promote evaporation efficiency.
See fig. 1 and show, the utility model discloses 6 outsourcing of pipeline have the heat preservation between humidification tower 1, dehumidification tower 8, dense liquid circulation pipeline 4, clear liquid circulation pipeline 5 and air circulation pipeline 3 and tower, and whole system water route pipeline and tower body all apply outside heat preservation cotton material, can further reduce system's calorific loss, the energy consumption of sparingly running.
See fig. 1, the utility model discloses heat transfer unit includes main heat exchanger 19, first auxiliary heat exchanger 21 and the auxiliary heat exchanger 17 of second, and main heat exchanger 19, first auxiliary heat exchanger 21 and the auxiliary heat exchanger 17 of second can adopt the plate heat exchanger of high-efficient anticorrosive material, and more traditional shell and tube type heat exchanger has that area is little, heat transfer area is big, heat exchange efficiency is high, advantage such as quick detachable washing. As shown in fig. 1, the utility model discloses connect gradually on the concentrate circulation pipeline 4 concentrated liquor lift pump 15 and be used for the heat main heat exchanger 19 and the first auxiliary heat exchanger 21 of heat transfer step by step, connect gradually on the clear liquor circulation pipeline 5 clear liquor lift pump 20 and be used for the main heat exchanger 19 and the second auxiliary heat exchanger 17 of heat transfer step by step, can be connected with filter 14 at concentrated liquor circulation pipeline 4 in the feed liquor front side of concentrated liquor lift pump 15, the clear liquor circulation pipeline 5 is connected with filter 14 in the feed liquor front side of clear liquor lift pump 20 similarly, carry out the counterpiltration to waste water and clear liquor through respective filter 14, waste water in the concentrated liquor circulation pipeline 4 and the clear liquor in the clear liquor circulation pipeline 5 carry out the heat transfer in main heat exchanger 19, to waste water, required energy when having saved waste water heating when its temperature risees; for the clear liquid, the temperature is reduced, meanwhile, the subsequent cooling step is quicker, the consumption of cooling water is saved, and the concentration treatment efficiency of the system is improved. The utility model discloses a first auxiliary heat exchanger 21 is connected with the useless waste heat of industry and is communicated with each other, and the waste water through a heat transfer gets into first auxiliary heat exchanger 21 and carries out the secondary heat transfer with the heat source, reaches the required temperature of system, owing to utilize the useless waste heat of industry as the heat source, has further reduced the operation energy consumption of system. The utility model discloses a second auxiliary heat exchanger 17 communicates with each other with cooling tower 13's comdenstion water, and the clear solution after once heat transfer cooling enters into second auxiliary heat exchanger 17 and carries out the secondary heat transfer cooling with the comdenstion water, and the cooling after-temperature reaches the required temperature of system operation 30 ℃ -40 ℃, in the filler bed layer 9 of uniform water distribution to the tower body in the water-locator 2 through dehumidification tower 8 afterwards.
As shown in figure 1, the utility model discloses thick liquid circulation pipeline 4 still is connected with super thick liquid delivery pipe 16 in the front side of hot main heat exchanger 19, and this super concentrated liquid is connected with desiccator 18, can make the super concentrated liquid of gathering at the humidification tower 1 tower bottom pass through thick liquid elevator pump 15 back row and carry out the secondary concentrated drying to desiccator 18 in, and the ton bag that has the inner bag is packed into to the salt mud that forms after the drying, backfills and handles.
The utility model discloses a pretreatment unit 12, humidification tower 1, dehumidification tower 8, inter-tower fan 7, main heat exchanger 19, first auxiliary heat exchanger 21, the auxiliary heat exchanger 17 of second, cooling tower 13, desiccator 18 and each on the pipeline valve accessible PLC automatic control system realize the automatic start, operation and the parking of the concentrated system of waste water, can effectively reduce by a wide margin and artificially control.
See fig. 1, the utility model discloses a waste water concentration system during operation based on air increases wet, the dehumidification, get rid of the waste water of hardness ion in the water after the preliminary treatment and add lower part in the tower from the water inlet A of humidification tower 1, this waste water can be filtration liquid or filtration liquid film concentrate etc. enter into humidification tower 1 in waste water temperature at 30 ℃ -40 ℃, waste water gets into in the dense liquid circulation pipeline 4 from the cold side heat transfer mouth A of humidification tower 1, the clear liquid adds the lower part in the tower and gets into in the clear liquid circulation pipeline 5 from the clear liquid water inlet C of dehumidification tower 8, this clear liquid temperature is at 85 ℃ -95 ℃, humidification tower 1 and dehumidification tower 8 are the ordinary pressure state.
As shown in figure 1, the utility model starts a concentrated solution lift pump 15 and a clear solution lift pump 20, wastewater is sent to a cold side fluid inlet end of a main heat exchanger 19 by the concentrated solution lift pump 15, clear solution is sent to a hot side fluid inlet end of the main heat exchanger 19 by the clear solution lift pump 20, wastewater and clear solution carry out primary heat exchange in the main heat exchanger 19, wastewater at 30-40 ℃ and high temperature clear solution at 85-95 ℃ carry out primary heat exchange, the temperature of the wastewater after heat exchange by the main heat exchanger 19 can reach 65-85 ℃, then the wastewater enters a first auxiliary heat exchanger 21 and is sent to a water distributor 2 at the upper part of a humidifying tower 1 after secondary heat exchange, the wastewater after heat exchange by the main heat exchanger 19 enters the first auxiliary heat exchanger 21 to carry out secondary heat exchange and temperature rise with industrial waste heat/waste heat, the temperature required by system operation reaches 85-95 ℃, and the wastewater reaching temperature can be sent to the top of the humidifying tower, then the water is uniformly distributed to a packing bed layer 9 of the tower body through a water distributor 2. The temperature of the clear liquid after heat exchange and temperature reduction by the main heat exchanger 19 can reach 55-65 ℃, the clear liquid after primary temperature reduction enters the second auxiliary heat exchanger 17, after secondary cooling, the clear liquid enters the water distributor 2 of the dehumidification tower 8, the clear liquid after primary heat exchange and temperature reduction enters the second auxiliary heat exchanger 17 to carry out secondary heat exchange and temperature reduction with the condensed water, the temperature required by system operation is 30-40 ℃, then the clear liquid is uniformly distributed into the filler bed layer 9 through the water distributor 2 at the top of the tower, the temperature of part of the clear liquid reaches the allowable discharge range, and the clear liquid is discharged.
See fig. 1 and show, the utility model discloses waste water 2 cloth in humidification tower 1 is to packing bed 9 on and flow to the tower bottom under the effect of gravity, air after the dehumidification in the dehumidification tower 8 lets in the tower bottom gas distribution dish 11 of humidification tower 1 through air circulation pipeline 3 and upwards flows, the air carries out mass transfer heat transfer with waste water convection on packing bed 9 surface, enlarge the area of contact of waste water and flowing air through the regular packing of a large amount of light in the bed, moisture in the waste water is brought into and is obtained damp and hot air and concentrate in the air, the concentrate flow that obtains carries out waste water concentrated circulation in getting into concentrated liquid circulation pipeline 4 again to the tower bottom and entering system, cold dry air in the humidification tower 1 becomes damp and hot air gradually this moment. As shown in figure 1, the utility model discloses in the humid and hot air in humidification tower 1 is by the inter-tower fan 7 suction dehumidification tower 8, the clear solution after the cooling is distributed on packing bed 9 through water-locator 2 in dehumidification tower 8 and flows to the bottom of the tower under the effect of gravity, humid and hot air carries out mass transfer heat transfer at packing bed 9 surface and the clear solution after the cooling, enlarge the area of contact of clear solution and flowing air through a large amount of light regular packing in the bed, water is separated out when gaseous steam in the humid and hot air reaches the condensation dew point, obtain the water droplet and rise to the air after the top of the tower is dehumidified, because gaseous steam in the air condenses into liquid water droplet and gets into in the clear solution, the water droplet that obtains flows to the bottom of the tower and dehumidifies the circulation to the air, the air after the dehumidification gets into air circulation pipeline 3 from dehumidification air outlet E and then gets into the bottom of the tower gas distribution dish 11 in humidification tower 1 and forms the dry and dehumidif, continuously concentrating the wastewater.
As shown in figure 1, the utility model discloses the hyperconcentration of gathering at the humidification tower bottom carries out the secondary concentrated drying from hyperconcentration delivery pipe 16 row to desiccator 18 through the concentrate elevator pump, and the solid matter after the drying is backfilled and is handled, the utility model discloses can regularly carry out drying process with the hyperconcentration of humidification tower bottom.
Claims (11)
1. The utility model provides a concentrated system of waste water based on air is humidified, is dehumidified which characterized in that: comprises a humidifying unit, a dehumidifying unit, a dry and wet air circulating unit and a heat exchange unit;
the humidifying unit is used for concentrating and circulating wastewater and comprises a humidifying tower and a concentrated solution circulating pipeline, a water distributor is arranged at the upper part of the humidifying tower, a tower bottom gas distribution disc is arranged at the lower part of the humidifying tower, a packing bed layer used for increasing the contact area of a liquid phase and a gas phase is arranged between the water distributor and the tower bottom gas distribution disc of the humidifying tower, a wastewater inlet A and a cold side heat exchange port B are sequentially and downwards arranged at the lower part of the tower bottom gas distribution disc of the humidifying tower, one end of the concentrated solution circulating pipeline is communicated with the water distributor in the humidifying tower, and the other end of the concentrated solution circulating pipeline is communicated with the cold;
the dehumidification unit is used for dehumidifying and circulating air and comprises a dehumidification tower and a clear liquid circulation pipeline, wherein a water distributor is arranged at the upper part of the dehumidification tower, a dehumidification air outlet E is arranged at the top part of the dehumidification tower, a packing bed layer used for increasing the contact area of a liquid phase and a gas phase is arranged at the lower part of the water distributor of the dehumidification tower, a clear liquid water inlet C and a hot side heat exchange port D are sequentially and downwards arranged at the lower part of the dehumidification tower, one end of the clear liquid circulation pipeline is communicated with the water distributor in the dehumidification tower, and the other end of the clear liquid circulation pipeline is communicated with the hot side;
the dry and wet air circulation unit is used for closed air circulation of the humidifying tower and the dehumidifying tower and comprises an inter-tower fan and an air circulation pipeline, the inter-tower fan is arranged on the inter-tower pipeline, one end of the inter-tower pipeline is connected and communicated with the humidifying tower, the other end of the inter-tower pipeline is connected and communicated with the dehumidifying tower, one end of the air circulation pipeline is connected and communicated with a dehumidifying air outlet E of the dehumidifying tower, and the other end of the air circulation pipeline is connected and communicated with a tower bottom air distribution disc of the humidifying tower;
the heat exchange unit comprises a main heat exchanger, a first auxiliary heat exchanger and a second auxiliary heat exchanger, a concentrated liquid lifting pump, a heat main heat exchanger and a first auxiliary heat exchanger which are used for heat exchange step by step are sequentially connected to a concentrated liquid circulating pipeline, a clear liquid lifting pump, a main heat exchanger and a second auxiliary heat exchanger which are used for heat exchange step by step are sequentially connected to a clear liquid circulating pipeline, waste water in the concentrated liquid circulating pipeline and clear liquid in the clear liquid circulating pipeline exchange heat once in the main heat exchanger, and a super concentrated liquid discharge pipe is further connected to the front side of the heat main heat exchanger through the concentrated liquid circulating pipeline.
2. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the water distributor comprises a porous water distribution ring pipe and a first-stage sieve pore water distribution plate positioned at the lower part of the porous water distribution ring pipe, a plurality of spray heads are uniformly distributed on the porous water distribution ring pipe, and the number of water outlets on the first-stage sieve pore water distribution plate is larger than that of the spray heads on the porous water distribution ring pipe.
3. The air humidification and dehumidification-based wastewater concentration system according to claim 2, wherein the system comprises: the porous water distribution ring pipe comprises at least more than two pipe rings with different sizes and an intermediate communicating pipe, each pipe ring is communicated through at least two intermediate communicating pipes, and a pipe section extending outwards from the intermediate communicating pipe is arranged at an interface.
4. The air humidification and dehumidification-based wastewater concentration system according to claim 2, wherein the system comprises: the water-locator still has the second grade sieve mesh water distribution plate that is located one-level sieve mesh water distribution plate lower part, and the apopore aperture on the second grade sieve mesh water distribution plate is less than the apopore aperture on the one-level sieve mesh water distribution plate, and the apopore on the second grade sieve mesh water distribution plate sets up with the apopore on the one-level sieve mesh water distribution plate in a mutually wrong way.
5. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the packing bed layers in the humidifying tower and the dehumidifying tower are single layers or multiple layers arranged at intervals, and the packing bed layers are filled with a plurality of pall ring packings, Raschig ring packings or saddle ring packings.
6. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the pipeline between the towers is connected with a plurality of branch pipes which are connected in parallel at the rear part of the fan between the towers, the lower part of the dehumidification tower corresponding to the packing bed layer is also provided with a gas distribution disc, and the plurality of branch pipes are communicated with the respective corresponding gas distribution discs.
7. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the dehumidification tower is characterized in that a plurality of pipelines are arranged among the towers, the lower portion of the corresponding packing bed layer is provided with an air distribution disc, one end of each pipeline among the towers is connected to the humidification tower at intervals, and the other end of each pipeline among the towers is connected to the corresponding air distribution disc.
8. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the concentrated solution circulation pipeline is connected with a filter on the liquid inlet front side of the concentrated solution lift pump, and the clear solution circulation pipeline is connected with a filter on the liquid inlet front side of the clear solution lift pump.
9. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the first auxiliary heat exchanger is communicated with industrial waste/waste heat, and the second auxiliary heat exchanger is communicated with condensed water of the cooling water tower.
10. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: and the humidifying tower, the dehumidifying tower, the concentrated solution circulating pipeline, the clear solution circulating pipeline, the air circulating pipeline and the inter-tower pipeline are all externally coated with heat insulating layers.
11. The air humidification and dehumidification-based wastewater concentration system according to claim 1, wherein the system comprises: the wastewater inlet A of the humidifying tower is communicated with a wastewater inlet pipe, the wastewater inlet pipe is communicated with a water outlet of a pretreatment unit, and the pretreatment unit is used for removing hardness ions in wastewater and preheating the wastewater.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111453915A (en) * | 2020-05-18 | 2020-07-28 | 上海蜀库环保科技中心 | Wastewater concentration system based on air humidification and dehumidification and concentration method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111453915A (en) * | 2020-05-18 | 2020-07-28 | 上海蜀库环保科技中心 | Wastewater concentration system based on air humidification and dehumidification and concentration method thereof |
| CN111453915B (en) * | 2020-05-18 | 2024-07-16 | 维尔利环保科技集团股份有限公司 | Wastewater concentration system and method based on air humidification and dehumidification |
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