CN113860408A - High-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat - Google Patents
High-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat Download PDFInfo
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- CN113860408A CN113860408A CN202010619980.9A CN202010619980A CN113860408A CN 113860408 A CN113860408 A CN 113860408A CN 202010619980 A CN202010619980 A CN 202010619980A CN 113860408 A CN113860408 A CN 113860408A
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—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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- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
发明公开了一种利用工业中低温余热的高盐废水蒸发浓缩及淡水回收装置，包括设有废水池的填料式蒸发浓缩塔、淡水回收塔、连接风管、废水循环泵、废水加热器、冷却循环泵、蓄热水箱和冷却器；废水池通过排污管连接至污泥脱水车间；淡水收集池将淡水输送至淡水用户；表冷器的入口与冷却循环泵的出口相连，表冷器的出口顺次与蓄热水箱和冷却器相连，冷却器冷侧与厂区冷却塔冷却系统相连。本发明利用非金属弹性体填料式蒸发方式来蒸发浓缩废水，利用厂区丰富的中低品位余热资源来为蒸发设备提供热源，回收部分淡水凝结热用于生活热水，回收淡水给厂区淡水用户，达到节能环保、节约废水蒸发浓缩系统投资和节省运行能耗费用的目的。
The invention discloses a high-salt wastewater evaporative concentration and fresh water recovery device utilizing low-temperature waste heat in the industry, including a packed evaporative concentration tower with a wastewater pool, a fresh water recovery tower, a connecting air pipe, a wastewater circulating pump, a wastewater heater, a cooling Circulating pump, hot water storage tank and cooler; the waste water tank is connected to the sludge dewatering workshop through the sewage pipe; the fresh water collection tank transports fresh water to the fresh water users; the inlet of the surface cooler is connected to the outlet of the cooling circulation pump, and the The outlet is connected to the hot water storage tank and the cooler in sequence, and the cold side of the cooler is connected to the cooling system of the cooling tower in the plant area. The invention utilizes the non-metallic elastomer packing evaporation method to evaporate and concentrate the wastewater, utilizes the abundant medium and low-grade waste heat resources in the plant area to provide a heat source for the evaporation equipment, recovers part of the fresh water condensation heat for domestic hot water, and recovers the fresh water for the fresh water users in the plant area. To achieve the purpose of energy saving and environmental protection, saving waste water evaporation and concentration system investment and saving operating energy costs.
Description
Technical Field
The invention relates to the technical field of energy conservation and emission reduction of factories, in particular to a high-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat.
Background
The evaporation concentration zero discharge of industrial wastewater becomes an important subject in the field of environmental protection. The method for concentrating the high-salinity wastewater at the tail end by adopting the thermal evaporation method almost becomes a link which can not be avoided when zero discharge of the wastewater is realized. The traditional evaporation concentration equipment has the following defects that (1) the energy consumption is large; (2) expensive titanium materials which are resistant to chloride ion corrosion are generally used as heat exchange tube materials of the evaporator, so that the equipment investment is increased, the water quality fluctuation of effluent of the pretreatment process is restrained, the surface corrosion and scaling risks still exist, and the maintenance workload is large; (3) the requirement on the quality of high-salinity wastewater entering the evaporator is high, the water treatment cost of the system is increased, and the operation reliability and stability of the system are insufficient; (4) when the low-temperature flue gas evaporation method is adopted, although the evaporation cost is reduced, solid matters in the waste water are collected into the smoke dust, and harmful solid matters in the waste water are not collected and concentrated but diffused into the environment along with the smoke dust, so that the potential hazard is realized.
Research and development of a new generation of high-salinity wastewater evaporation and concentration technology and fresh water recovery equipment reduce wastewater evaporation and concentration cost, realize hazardous waste control and fresh water full recovery of a wastewater zero-discharge process, and have strong practical significance for improving the operation reliability of a tail-end wastewater zero-discharge system.
Disclosure of Invention
The invention aims to overcome the defects of the existing wastewater evaporation technology and provide a high-salinity wastewater evaporation concentration and fresh water recovery device utilizing industrial low-temperature waste heat.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat, which comprises a filler type evaporative concentration tower and a fresh water recovery tower,
a wastewater tank is arranged at the bottom in the packed evaporation concentration tower, evaporation filler is arranged above the wastewater tank, the evaporation filler divides the space in the packed evaporation concentration tower into an upper cavity and a lower cavity, a water distributor is arranged above the evaporation filler, the water distributor is communicated with the wastewater tank through a pipeline, and a wastewater circulating pump and a wastewater heater are arranged on a communicated pipeline of the water distributor and the wastewater tank;
a fresh water collecting pool is arranged at the bottom in the fresh water recovery tower, a wet surface cooler is arranged above the fresh water collecting pool, and the wet surface cooler divides the space in the fresh water recovery tower into an upper cavity and a lower cavity;
the lower cavity of the packed evaporative concentration tower is communicated with the lower cavity of the fresh water recovery tower through an air guiding pipeline, a circulating fan is arranged in the air guiding pipeline, the upper cavity of the packed evaporative concentration tower is communicated with the upper cavity of the fresh water recovery tower through a connecting air pipe, the circulating fan is used for driving air and hot air circulation between the packed evaporative concentration tower and the fresh water recovery tower, a hot water outflow pipe with an inlet and an outlet connected to a wet surface cooler is arranged on the heat medium side of the wet surface cooler, a hot water storage tank, a cooler and a cooling circulating pump are arranged on the hot water outflow pipe, and under the driving of the cooling circulating pump, hot medium water in the hot water outflow pipe firstly enters the hot water storage tank to release heat and then enters the cooler to be cooled, and finally flows back to the wet surface cooler; the fresh water collecting pool is sent to fresh water users; and water in the hot water storage tank is delivered to a domestic hot water user.
The high-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat further comprises a first water baffle arranged at an air inlet of the air inducing pipeline, and a second water baffle arranged at an air outlet of the fresh water recovery tower.
Utilize high salt waste water evaporative concentration and fresh water recovery unit of low temperature waste heat in industry as above, furtherly, the wastewater disposal basin is connected with sludge thickening tank through the blow off pipe, sludge pipe connection to sludge dewatering workshop is passed through to sludge thickening tank's export, be provided with the sludge pump on the sludge pipe, the cooler still is connected to the cooling tower of factory circulating water cooling.
The high-salinity wastewater evaporative concentration and fresh water recovery device utilizing low-temperature waste heat in industry is characterized in that the evaporative filler is made of an elastomer material with acid corrosion resistance and temperature resistance; the water distributor adopts a plastic nozzle with wastewater corrosion resistance and temperature resistance.
The high-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat further adopts the coil type or tube plate type heat exchange core body which is made of 316L stainless steel.
The high-salinity wastewater evaporative concentration and fresh water recovery device utilizing the low-temperature waste heat in the industry further adopts a shell-and-tube or plate heat exchanger as the wastewater heater.
In the high-salinity wastewater evaporative concentration and fresh water recovery device using low-temperature waste heat in industry, furthermore, all parts in the wastewater heater which are in direct contact with the wastewater are made of materials for preventing chloride ions from corroding, and parts which are not in direct contact with the wastewater are made of stainless steel.
According to the high-salinity wastewater evaporative concentration and fresh water recovery device utilizing low-temperature waste heat in industry, furthermore, when the wastewater heater adopts a plate heat exchanger, the wastewater heater is made of titanium materials; when the wastewater heater adopts a shell-and-tube heat exchanger, the shell-and-tube heat exchanger adopts a baffle-plate-free three-dimensional reinforced heat exchange tube compact heat exchanger form.
According to the high-salinity wastewater evaporative concentration and fresh water recovery device utilizing the low-temperature waste heat in the industry, further, the heat source of the waste heat heater is hot water or exhaust steam with the temperature of 85-95 ℃ produced by waste heat recovery in a factory; when dead steam is adopted, the pressure of the dead steam is 0.1 MPa.
The high-salinity wastewater evaporative concentration and fresh water recovery device utilizing the industrial low-temperature waste heat further comprises a wet surface cooler, wherein the temperature of inlet hot water of the wet surface cooler is 40-45 ℃, and the hot water is softened water.
Compared with the prior art, the invention has the beneficial effects that: the invention utilizes the waste heat of factories as an evaporation and concentration heat source, utilizes the difference of the water vapor capacity carried by saturated air at different temperatures, and adopts the filler type evaporation technology to concentrate high-salinity wastewater and the wet surface type cooling and dehumidifying mode to recover fresh water carried by the air so as to achieve the purposes of zero-emission treatment of the high-salinity wastewater and recovery of the fresh water. Because the waste heat resources of factories are utilized and the condensation heat of fresh water is partially recovered, the energy cost of the system is greatly reduced; and because the difference of the water content mass fraction of saturated air at different temperatures is utilized, the purpose of evaporative concentration is achieved by improving the surface evaporation temperature of the wastewater, the air temperature is reduced through a dividing wall type wet surface condenser, the water content mass fraction of the air is reduced to dehumidify, fresh water is recovered, zero emission of waste gas is further realized through a hot air circulation mode, part of the condensation latent heat of the fresh water absorbed by the surface cooler is recovered and transferred into domestic hot water through a heat storage water tank, the cooling energy consumption and the water consumption of a circulating cooling system are reduced, and therefore the energy consumption of the whole system is reduced, and the energy cost is further reduced. Because of adopting the filler type surface evaporation and the large-flow plastic nozzle, the wastewater enters the evaporation concentration process and has no special requirements on the quality of the wastewater, even does not need softening treatment, the water treatment operation cost of the system is greatly reduced, but the anti-scaling requirement is provided for the material selection of the wastewater circulating pump when the wastewater is not softened.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
The reference numerals in the drawings mean: 1. an air inlet; 2. evaporating the filler; 3. a water distributor; 401. a first water baffle; 402. a second water baffle; 5. connecting an air pipe; 6. a wet surface cooler; 7. a circulating fan; 8. an evaporation concentration tower; 9. a fresh water recovery tower; 10. a wastewater tank; 11. a wastewater circulating pump; 12. a waste water heater; 13. a heat storage water tank; 14. a cooler; 15. a cooling circulation pump; 16. a fresh water collecting tank; A. waste heat from the plant (hot water/steam exhaust); B. pretreating the system to obtain wastewater; C. concentrated water is delivered to a sludge concentration tank; D. to a cooling tower; E. to the domestic hot water user; F. to the fresh water user.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Example (b):
referring to fig. 1, a high salinity wastewater evaporative concentration and fresh water recovery device using industrial low temperature waste heat comprises a filler type evaporative concentration tower 8, a fresh water recovery tower 9, a connecting air pipe 5, a wastewater circulating pump 11, a wastewater heater 12, a heat storage water tank 13, a cooler 14 and a cooling circulating pump 15; the evaporation concentration tower 8 comprises an evaporation filler 2, a water distributor 3 and a first water baffle 401, the evaporation concentration tower 8 is connected with a fresh water recovery tower 9 through a connecting air pipe 5, and the lower part of the evaporation concentration tower 8 is provided with a wastewater pool 10; the evaporation filler 2 is positioned in the evaporation concentration tower 8, and a water distributor 3 is arranged on the evaporation concentration tower 8 above the evaporation filler 2; a heat exchange core body is arranged in the fresh water recovery tower 9 and is a coil pipe type/pipe plate type wet surface cooler 6, and an air outlet of the fresh water recovery tower 9 is provided with a second water baffle 402. The filler type evaporation concentration tower is communicated with the fresh water recovery tower through an air introduction pipeline, a circulating fan 7 is arranged in the air introduction pipeline, the circulating fan 7 is used for driving air and hot air circulation between the filler type evaporation concentration tower and the fresh water recovery tower, the air introduction pipeline is connected with the evaporation concentration tower 8 and is an air inlet 1 of the evaporation concentration tower 8, the air introduction pipeline is connected with the fresh water recovery tower 9 and is an air outlet of the fresh water recovery tower 9, and an arrow indicates the wind direction.
An inlet of the wastewater circulating pump 11 is connected with the wastewater pool 10 through a connecting pipe, an outlet of the wastewater circulating pump 11 is communicated with the wastewater heater 12 through a connecting pipe, and an outlet of the wastewater heater 12 is communicated with the water distributor 3; the wastewater tank 10 is connected to a sludge concentration tank of a sludge dewatering plant through a sewage discharge pipe. The fresh water collecting pool 16 is provided with a fresh water conveying outlet which conveys the fresh water to fresh water users through a water pump; the inlet of the wet surface cooler 6 is connected with the outlet of the cooling circulation pump 15, and the outlet of the wet surface cooler 6 is sequentially connected with the heat storage water tank 13 and the cooler 14 through the outflow pipe; the inlet and outlet of the cold side of the heat storage water tank 13 are respectively connected to a plant domestic hot water system; the outlet of the hot side of the cooler 14 is connected with the inlet of a cooling circulating pump 15, and the inlet and the outlet of the cold side of the cooler 14 are respectively connected with the outlet and the inlet of a cooling tower cooled by circulating water in a plant area. The coil/tube plate type wet surface cooler 6 of the present invention is a wet surface cooler 6. Referring to fig. 1, arrows or letters in the drawing are respectively represented as: A. waste heat from the plant (hot water/steam exhaust); B. pretreating the system to obtain wastewater; C. concentrated water is delivered to a sludge concentration tank; D. to a cooling tower; E. to the domestic hot water user; F. to the fresh water user, the arrow indicates the wind direction.
Waste water passes through a waste water heater 12 through a waste water circulating pump 11, absorbs waste heat recovered by a low-temperature waste heat recovery system in a plant area, the temperature is raised to 80-90 ℃, then the waste water is sprayed into an evaporation filler 2 through a water distributor 3 to form a water film for evaporation, and the waste water is concentrated in continuous circulating spraying and evaporation; the bottom of the wastewater pool 10 is provided with a sludge or concentrated water discharge pipe, the thick and pus waste liquid is firstly pumped to a sludge concentration pool of a sludge dewatering workshop, dewatering is carried out by a dewatering machine after further concentration, the dewatered water can return to the wastewater pool 10 of the evaporation concentration tower 8, and the dewatered solid matters are separately treated. After the wastewater is evaporated in the filler type evaporation concentration tower 8, air completes a carrier gas extraction process in an evaporation filler, the air is driven by a circulating fan 7 to enter a fresh water recovery tower 9 through a connecting air pipe 5 after being heated and humidified, part of the air is condensed on the surface of a wet surface cooler 6 and finally converges into a fresh water collecting tank 16 at the lower part of the fresh water recovery tower 9, and part of the gas which is not liquefied reenters the filler type evaporation concentration tower 8 from an air guide pipeline to complete closed circulation of the air and hot air.
The evaporation filler 2 is a filler made of materials with acid corrosion resistance and temperature resistance, such as an elastomer filler made of polytetrafluoroethylene materials. The selected filler can increase the surface evaporation capacity, is convenient to wash and not easy to block, and the elastomer filler can be prepared to be convenient for removing dirt and scale on the surface by vibration during regular maintenance. The temperature resistance of the filler in the embodiment is a medium temperature resistant grade material, most of sprayed hot wastewater is in a water film shape on the surface of the filler, and the partial pressure of water vapor on the surface of the water film and the partial pressure of water vapor in air flow have a pressure difference to form a water film evaporation driving force to promote the evaporation of the wastewater; a small proportion of the water droplets undergo evaporation from the surface of the droplets in collisions with the air stream.
The water distributor 3 adopts a plastic nozzle with acid corrosion resistance and temperature resistance. The plastic nozzle has the advantages of good water distribution dispersibility, strong corrosion resistance and difficult blockage. The plastic nozzle of the water distributor 3 is made of a high-flow medium temperature resistant grade material, such as an ABS material non-blocking nozzle.
The wet surface cooler 6 is a coil type or tube plate type condenser, and the material thereof is 316L stainless steel.
The heat source of the waste water heater 12 is hot water or exhaust steam produced by a low-temperature flue gas waste heat recovery heat exchanger in a plant area; when dead steam is adopted, the pressure of the dead steam is 0.1 MPa; when hot water supplied by the low-temperature flue gas waste heat recovery heat exchanger is adopted, the hot water temperature is 85-95 ℃.
The waste water heater 12 adopts a tubular or plate heat exchanger; parts which are in direct contact with the wastewater are made of materials such as titanium materials which can prevent chloride ions from corroding, and other parts which are not in direct contact with the wastewater are made of stainless steel materials; when the waste water heater 12 adopts a plate heat exchanger, the heater is made of titanium materials; when the wastewater heater 12 adopts a shell-and-tube heat exchanger, the shell-and-tube heat exchanger adopts a baffle-free three-dimensional reinforced heat exchange tube compact heat exchanger form.
After being heated by the waste water heater 12, the waste water is heated to 80-90 ℃, and then is dispersed to the evaporation filler 2 through the water distributor 3 for surface evaporation concentration.
The temperature of cooling water at the inlet of the wet surface cooler 6 is 40-45 ℃, preferably 42 ℃, the outlet temperature is 57-62 ℃, and the cooling water adopted by the hot water is softened water.
The carrier medium adopted by the evaporation of the waste water in the evaporation concentration tower 8 is air, and the air enters the fresh water recovery tower 9 after absorbing water vapor to finish the condensation and recovery of fresh water and then returns to the evaporation concentration tower 8 through the circulating fan 7. The evaporation concentration tower 8 and the fresh water recovery tower 9 adopt simple and easily-obtained air as a carrier medium, and the evaporation concentration of the wastewater and the condensation recovery of the fresh water are realized by using the difference of the moisture content of saturated air at different temperatures and the difference of the partial pressure of water vapor and the partial pressure of water vapor on the surface of a packing layer/wet wall water film as driving forces.
The high-salinity wastewater evaporative concentration and fresh water recovery device utilizing low-temperature waste heat in industry aims to develop a method and a technology for tail-end wastewater zero-emission treatment by concentrating high-salinity wastewater by adopting a filler type evaporation technology and recovering fresh water by wet surface type cooling, and the cheap waste heat of a factory is used as a wastewater evaporative concentration heat source, so that the energy cost for evaporative concentration is greatly reduced; by adopting a filler type evaporation low-temperature evaporation technology, warm waste water is sprayed to the surface of a filler through a large-flow plastic nozzle to form water film surface evaporation, the difference between the water vapor partial pressure on the water film surface and the water vapor partial pressure in the air is used as an evaporation driving force, and the evaporated water is brought to a fresh water recovery tower 9 by the air; the wet surface type cooling and condensing technology is adopted, fresh water is recovered through temperature reduction and humidity reduction, partial condensation latent heat is recovered through the heat storage water tank, and redundant low-temperature waste heat is dissipated through a cooling system of a plant cooling tower.
Compared with an evaporation concentration system represented by multi-effect evaporation or MVR evaporation, the evaporation process of the high-salinity wastewater evaporation concentration and fresh water recovery device using industrial low-temperature waste heat has lower requirement on heat consumption quality, can use a large amount of low-temperature waste heat resources in a factory, does not need high-quality fresh steam, does not need compression work in the process of recovering latent heat of water vapor condensation, only needs to drive a fan and a water pump of an intermediate medium (air or circulating water) to consume power, and has the power consumption of 15-20 kWh/t of wastewater per ton of water evaporation concentration (about 40-50% of the energy consumption of the MVR system per ton of water evaporation concentration); in addition, the evaporation concentration process is completed at a medium-low temperature, corrosion-resistant materials such as fluoroplastics and the like are adopted, wastewater can be free of softening treatment, the cost of wastewater pretreatment is greatly reduced, the adopted elastomer plastic filler is easy to wash and vibrate for cleaning, the problem of scaling and blocking of a heat exchanger is avoided, the operation reliability of a system is greatly improved, and meanwhile, the maintenance cost is greatly reduced. Compared with the flue evaporation type waste water treatment zero emission technology, although the equipment investment is increased, the problem of nozzle blockage is not worried about, the problem of influence on the operation performance of a rear system such as a dust remover and a desulfurizing tower worried about by a flue evaporation process is not worried about, the problem of flue blockage is not worried about, the coal consumption in the production of factory unit products is hardly influenced, and the worry that the salt content in smoke is improved to influence the resource utilization of the smoke caused by solid matters entering the smoke after waste water evaporation in the flue evaporation is avoided. The implementation case has no waste gas discharge, realizes 100 percent recycle of waste water, has extremely little high-grade energy consumption, and is a typical energy-saving and environment-friendly technology. The initial investment of the equipment is between an MVR evaporation concentration system and a bypass flue gas evaporation system, but the softening treatment is not needed, so that most of water treatment cost is saved, and the actual running comprehensive cost is about one third of that of an MVR evaporation crystallization wastewater zero-discharge treatment system.
It should be noted that, in the high-salinity wastewater evaporative concentration and fresh water recovery apparatus using low-temperature waste heat in industry according to the embodiment, the wastewater evaporative concentration method is also suitable for other industrial wastewater evaporative concentration and zero-emission processes having waste heat resources.
The invention adopts an air closed circulation system, waste heat of a factory is adopted to heat waste water, and in the evaporation and cooling processes, the carrier gas flow adopts closed circulation, so that the pollution caused by the emission of humid air to the surrounding environment is avoided; the recovery of latent heat is more controllable and the utilization mode is more flexible by a fresh water condensation heat recovery mode; partial waste heat of the fresh water recovery heat medium water is used for domestic hot water, so that the load of a circulating cooling system is reduced, the energy efficiency level of the system is improved, and the adjustment flexibility of the fresh water recovery system is enhanced; the invention adopts elastomer filler, and is easy to wash and shake for cleaning.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A high-salinity wastewater evaporation concentration and fresh water recovery device utilizing industrial low-temperature waste heat comprises a filler type evaporation concentration tower and a fresh water recovery tower, and is characterized in that,
a wastewater tank is arranged at the bottom in the packed evaporation concentration tower, evaporation filler is arranged above the wastewater tank, the evaporation filler divides the space in the packed evaporation concentration tower into an upper cavity and a lower cavity, a water distributor is arranged above the evaporation filler, the water distributor is communicated with the wastewater tank through a pipeline, and a wastewater circulating pump and a wastewater heater are arranged on a communicated pipeline of the water distributor and the wastewater tank;
a fresh water collecting pool is arranged at the bottom in the fresh water recovery tower, a wet surface cooler is arranged above the fresh water collecting pool, and the wet surface cooler divides the space in the fresh water recovery tower into an upper cavity and a lower cavity;
the lower cavity of the packed evaporative concentration tower is communicated with the lower cavity of the fresh water recovery tower through an induced air pipeline, a circulating induced draft fan is arranged in the induced air pipeline, the upper cavity of the packed evaporative concentration tower is communicated with the upper cavity of the fresh water recovery tower through a connecting air pipe, the circulating induced draft fan is used for driving air and hot air circulation between the packed evaporative concentration tower and the fresh water recovery tower, a hot water outflow pipe with an inlet and an outlet connected to a wet surface cooler is arranged on the hot medium side of the wet surface cooler, a hot water storage tank, a cooler and a cooling circulating pump are arranged on the hot water outflow pipe, and under the driving of the cooling circulating pump, hot medium water in the hot water outflow pipe firstly enters the hot water storage tank to release heat and then enters the cooler to be cooled, and finally flows back to the wet surface cooler; the fresh water collecting pool is sent to fresh water users; and water in the hot water storage tank is delivered to a domestic hot water user.
2. The device for evaporative concentration and fresh water recovery of high salinity wastewater with low temperature waste heat in industry as claimed in claim 1, wherein the air inlet of the induced air duct is provided with a first water baffle, and the air outlet of the fresh water recovery tower is provided with a second water baffle.
3. The high salinity wastewater evaporative concentration and fresh water recovery device using low temperature waste heat in industry as claimed in claim 1, wherein the wastewater tank is connected with a sludge concentration tank through a blow-off pipe, the outlet of the sludge concentration tank is connected to a sludge dewatering plant through a sludge pipe, the sludge pipe is provided with a sludge pump, and the cooler is further connected to a cooling tower cooled by plant circulating water.
4. The high salinity wastewater evaporative concentration and fresh water recovery device using low temperature waste heat in industry as claimed in claim 1, wherein the evaporative filler is made of an elastomer material with acid corrosion resistance and temperature resistance; the water distributor adopts a plastic nozzle with wastewater corrosion resistance and temperature resistance.
5. The device for evaporative concentration and fresh water recovery of high salinity wastewater with industrial low-temperature waste heat according to claim 1, wherein the wet surface cooler is a coil or tube-plate heat exchange core made of 316L stainless steel.
6. The high-salinity wastewater evaporative concentration and fresh water recovery device using low-temperature waste heat in industry according to claim 1, wherein the wastewater heater adopts a shell-and-tube or plate heat exchanger.
7. The apparatus for evaporation concentration and fresh water recovery of high salinity wastewater with low temperature waste heat in industry according to claim 6, wherein the parts of the wastewater heater that directly contact with the wastewater are made of materials that prevent corrosion of chloride ions, and the parts that do not directly contact with the wastewater are made of stainless steel.
8. The high-salinity wastewater evaporative concentration and fresh water recovery device using low-temperature waste heat in industry according to claim 6, wherein when the wastewater heater adopts a plate heat exchanger, the wastewater heater is made of titanium material; when the wastewater heater adopts a shell-and-tube heat exchanger, the shell-and-tube heat exchanger adopts a baffle-plate-free three-dimensional reinforced heat exchange tube compact heat exchanger form.
9. The high-salinity wastewater evaporative concentration and fresh water recovery device using industrial low-temperature waste heat according to claim 1, wherein the heat source of the waste heat heater is 85-95 ℃ hot water or exhaust steam produced by waste heat recovery in a factory; when dead steam is adopted, the pressure of the dead steam is 0.1 MPa.
10. The apparatus for evaporative concentration and fresh water recovery of high salinity wastewater using industrial low-temperature waste heat according to claim 1, wherein the temperature of the hot water at the inlet of the wet surface cooler is in the range of 40 to 45 ℃, and the hot water is softened water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619980.9A CN113860408A (en) | 2020-06-30 | 2020-06-30 | High-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010619980.9A CN113860408A (en) | 2020-06-30 | 2020-06-30 | High-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat |
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| CN113860408A true CN113860408A (en) | 2021-12-31 |
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| CN202010619980.9A Pending CN113860408A (en) | 2020-06-30 | 2020-06-30 | High-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat |
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| CN115304116A (en) * | 2022-06-17 | 2022-11-08 | 华电电力科学研究院有限公司 | High-salinity wastewater concentration treatment device and method based on enhanced natural evaporation |
| CN115745049A (en) * | 2022-11-21 | 2023-03-07 | 北京理工大学 | Ultralow-energy-consumption steam self-backheating and self-condensing water treatment device |
| JP2023100478A (en) * | 2022-01-06 | 2023-07-19 | 株式会社ワンワールド | Exhaust heat utilization equipment for buildings |
| CN117771700A (en) * | 2024-01-11 | 2024-03-29 | 河南省化工研究所有限责任公司 | A flexible filler super gravity evaporation system |
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| CN117771700A (en) * | 2024-01-11 | 2024-03-29 | 河南省化工研究所有限责任公司 | A flexible filler super gravity evaporation system |
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Application publication date: 20211231 |