CN114573062B - Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower - Google Patents
Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower Download PDFInfo
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- CN114573062B CN114573062B CN202210191633.XA CN202210191633A CN114573062B CN 114573062 B CN114573062 B CN 114573062B CN 202210191633 A CN202210191633 A CN 202210191633A CN 114573062 B CN114573062 B CN 114573062B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C1/14—Direct-contact trickle coolers, e.g. cooling towers comprising also a non-direct contact heat exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
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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
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a desulfurization waste liquid treatment method based on a natural ventilation wet cooling tower, which comprises the following steps: building a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower filler, a pump and a heat exchanger; high-temperature circulating water of the natural ventilation wet cooling tower is supplied to a heat exchanger; the desulfurization waste liquid is supplied to an evaporator spraying device from a waste liquid pool by a pump, sprayed to the filler of the evaporation tower by the evaporator spraying device, subjected to heat exchange by a heat exchanger, and returned to the waste liquid pool, so that the desulfurization waste liquid is recycled; the environmental air introduced from the inlet is upwards subjected to heat exchange through a heat exchanger, the hot air is upwards subjected to heat exchange with the desulfurization waste water in the filler of the evaporation tower in a water film form, and the hot air is continuously upwards subjected to heat exchange with the desulfurization waste liquid sprayed by the evaporator spraying device in the spraying area; the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes upwards from the outlet.
Description
Technical Field
The invention relates to a thermal power generation desulfurization waste liquid treatment, in particular to a desulfurization waste liquid treatment method based on a natural ventilation wet cooling tower.
Background
The natural ventilation cooling tower is industrial cooling equipment and is widely applied to thermal power plants. Natural draft cooling towers can be classified into wet cooling towers and indirect air cooling towers according to the cooling mode. The wet cooling tower discharges waste heat contained in the high-temperature water into the atmosphere by utilizing evaporation through direct contact of air and water; the indirect air cooling tower circulates the high temperature water in a pipeline in the radiator, and the waste heat contained in the high temperature water is discharged into the atmosphere by utilizing the air cooling radiator. Wet cooling towers are widely used in the south and northeast regions of China, while indirect air cooling towers are widely used in the northwest regions of water resource shortage. According to whether there is a water collecting tank, it is divided into a wet conventional cooling tower and a wet high-level water-collecting cooling tower.
In recent years, with the improvement of environmental protection requirements in China, new thermal power plants are all required to synchronously construct desulfurization devices, and the most widely applied desulfurization method at present is a limestone-gypsum wet desulfurization process.
The key step of the desulfurization waste liquid treatment is to make the desulfurization waste liquid evaporate and crystallize, and finally achieve zero emission. The concentration crystallization technique comprises: mechanical vapor compression (MVR) recycling techniques, forward osmosis (MBC) concentration techniques, and ionic membrane (electrodialysis) concentration techniques. The desulfurization waste liquid treatment technology has large investment and high operation cost, taking 30t/h equipment as an example, the equipment investment cost is about 7000-7500 ten thousand yuan according to the consideration of the secondary softening precipitation pretreatment, and the desulfurization waste liquid treatment cost is about 100-200 yuan/t.
In addition, in order to treat the desulfurization waste liquid, a thermal power plant is generally required to independently construct a desulfurization waste liquid facility, so that the occupied area is increased.
Aiming at the problem of high desulfurization waste liquid treatment cost, the Chinese patent application CN201611100990.1 filed by the south electric power design institute of China, inc. Zhang Chunlin and the like in 2016, 12 and 5 days discloses a desulfurization waste liquid treatment integrated facility suitable for an indirect air cooling tower. According to the invention, the mechanical ventilation evaporation tower is arranged in the indirect air cooling tower, the desulfurization waste liquid is sprayed in the evaporation tower, and high-temperature and low-humidity air in the evaporation tower provides conditions for evaporation, so that the defects of high investment and high operation cost of the desulfurization waste liquid treatment process in the prior art are overcome.
However, in the south and northeast areas of China, wet cooling towers are mostly adopted for cooling, but no system or method for treating desulfurization waste liquid by utilizing a natural ventilation wet cooling tower exists at present.
The above information disclosed in this section is only for the background of the inventive concept and thus may contain information that does not constitute prior art.
Disclosure of Invention
In order to solve the problems of high desulfurization waste liquid treatment cost, difficult implementation, easy pollution and the like in the prior art, the invention provides an innovative desulfurization waste liquid treatment method based on a natural ventilation wet cooling tower, and the system is suitable for a thermal power plant adopting the natural ventilation wet cooling tower, effectively reduces the desulfurization waste liquid treatment cost by utilizing the characteristics of the natural ventilation cooling tower, avoids pollution of the desulfurization waste liquid to the cooling tower and is easy to implement.
The invention provides a desulfurization waste liquid treatment method based on a natural ventilation wet cooling tower, which comprises the following steps:
building a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower filler, a pump and a heat exchanger;
supplying high-temperature circulating water of the natural draft wet cooling tower to the heat exchanger;
the desulfurization waste liquid is supplied to the evaporator spraying device from the waste liquid pool by a pump, sprayed onto the filler of the evaporation tower by the evaporator spraying device, subjected to heat exchange by the heat exchanger, returned to the waste liquid pool, and circulated in a reciprocating manner;
the ambient air introduced from the inlet is subjected to heat exchange upwards through the heat exchanger, the hot air is subjected to heat exchange upwards with the desulfurization waste water in the evaporation tower filler in a water film mode, and the hot air is continuously subjected to heat exchange upwards in a spraying area with the desulfurization waste liquid sprayed by the evaporator spraying device;
the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes upwards from the outlet.
In a preferred embodiment, the construction of the closed evaporation tower further comprises: arranging the inlet of the closed evaporation tower in communication with the outside ambient air; an outlet of the closed evaporation tower is arranged in communication with the interior ambient air above the natural draft wet cooling tower water drenching area.
In a preferred embodiment, the construction of the closed evaporation tower further comprises: the closed evaporation tower is arranged inside or outside the natural ventilation wet cooling tower.
In a preferred embodiment, the method further comprises: the ambient air introduced from the inlet is preheated by means of a preheater.
In a preferred embodiment, the method further comprises: the pretreated desulfurization waste liquid to be evaporated is introduced into the waste liquid pool by means of a waste liquid supply pipe.
According to the desulfurization waste liquid treatment method based on the natural ventilation wet cooling tower, provided by the invention, the method has the following beneficial effects:
(1) And utilizing negative pressure. The outlet of the evaporation tower is communicated with the internal ambient air above the water spraying area of the natural ventilation wet cooling tower, namely, the air pressure at the outlet is negative pressure; while the inlet of the evaporation tower is in communication with the outside ambient air, i.e. the air pressure at the inlet is atmospheric (which may be approximately 0 Pa). Therefore, under the condition that no fan provides power, the pressure difference between the inlet and the outlet of the evaporation tower enables air to naturally flow into the evaporation tower, and the purpose of energy saving is achieved.
(2) Waste heat utilization. Because the heat exchanger in the form of the heat exchange coil is arranged in the evaporation tower, the heat exchanger is supplied with high-temperature circulating water by the water spraying device of the natural ventilation wet cooling tower, and the waste heat of the high-temperature circulating water in the natural ventilation cooling tower is fully utilized for evaporation, so that the purpose of waste heat utilization is realized.
(3) The evaporation efficiency is high. The desulfurization waste liquid is supplied to the evaporation tower spraying device from the waste liquid pool by means of the pump, sprayed to the evaporation tower filler by the evaporation tower spraying device, falls onto the heat exchange coil, exchanges heat by the heat exchanger, falls back to the waste liquid pool, and circularly reciprocates in this way, so that the circulation flow of the desulfurization waste liquid in the evaporation tower is realized. Ambient air introduced from the inlet escapes from the outlet via the air guide duct after passing upwardly through the heat exchange coil, the evaporator packing, the spray zone and the water receiver. On the one hand, in the circulating flow process, the desulfurization waste liquid continuously absorbs the heat of the high-temperature circulating water in the heat exchange coil, and the temperature of the desulfurization waste liquid gradually rises until the theoretical maximum temperature is approached. On the other hand, the ambient air introduced from the inlet is heated to hot air upwards through the heat exchange coil, the hot air heated through the heat exchange coil exchanges heat with the desulfurization waste liquid in a water film mode in an evaporation tower filling area additionally arranged in the evaporation tower, and further the hot air exchanges heat with the sprayed desulfurization waste liquid in a spraying area. The whole process ensures that the evaporation efficiency of the desulfurization waste liquid is high.
(4) The cooling capacity is improved. Because part of circulating water of the natural ventilation wet cooling tower enters the heat exchange coil in the evaporation tower, the heat of the circulating water is absorbed by the desulfurization waste liquid and the air, namely the evaporation tower assists the natural ventilation cooling tower to cool the circulating water, and the cooling capacity of the system is improved.
(5) Near zero pollution: the double water receiver arrangement of the water receiver of the natural ventilation wet cooling tower and the water receiver of the closed evaporation tower plays a role in double protection, and can effectively prevent the natural ventilation wet cooling tower and circulating water thereof from being polluted by desulfurization waste liquid drips in the closed evaporation tower.
(6) Easy to implement. The closed evaporation tower is placed outside the natural ventilation wet cooling tower, so that the operability is strong.
(7) Low investment cost and low running cost.
Drawings
Some example embodiments of the invention will be described more fully hereinafter with reference to the accompanying drawings; this invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, the drawings illustrate some example embodiments of the invention and, together with the description, serve to explain the principles and aspects of the invention.
In the drawings, the size may be exaggerated for clarity of illustration. Like numbers refer to like elements throughout.
Fig. 1 schematically illustrates a desulfurization waste liquid treatment method based on a natural draft wet cooling tower according to a preferred embodiment of the present invention.
Fig. 2 schematically illustrates a built-in system for implementing the desulfurization waste liquid treatment method of the natural draft wet cooling tower of the present invention.
Fig. 3 schematically illustrates an external system for implementing the desulfurization waste liquid treatment method of the natural draft wet cooling tower of the present invention.
Detailed Description
In the following detailed description, certain exemplary embodiments of the invention are shown and described, simply by way of illustration.
The invention will be further described with reference to the accompanying drawings.
Fig. 1 schematically illustrates a desulfurization waste liquid treatment method based on a natural draft wet cooling tower according to a preferred embodiment of the present invention.
As shown in fig. 1, a desulfurization waste liquid treatment method based on a natural ventilation wet cooling tower, the method comprising:
building a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower filler, a pump and a heat exchanger;
high-temperature circulating water of the natural ventilation wet cooling tower is supplied to a heat exchanger;
the desulfurization waste liquid is supplied to an evaporator spraying device from a waste liquid pool by a pump, sprayed to the filler of the evaporation tower by the evaporator spraying device, subjected to heat exchange by a heat exchanger, and returned to the waste liquid pool, so that the desulfurization waste liquid is recycled;
the environmental air introduced from the inlet is upwards subjected to heat exchange through a heat exchanger, the hot air is upwards subjected to heat exchange with the desulfurization waste water in the filler of the evaporation tower in a water film form, and the hot air is continuously upwards subjected to heat exchange with the desulfurization waste liquid sprayed by the evaporator spraying device in the spraying area;
the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes upwards from the outlet.
In one embodiment, constructing the closed evaporation tower further comprises: arranging the inlet of the closed evaporation tower in communication with the outside ambient air; the outlet of the closed evaporation tower is arranged in air communication with the interior environment above the water shower area of the natural draft wet cooling tower.
According to the present invention, the closed evaporation tower may be provided inside or outside the natural draft wet cooling tower.
Preferably, the ambient air introduced from the inlet may be preheated by means of a preheater.
Preferably, the pretreated waste liquid to be evaporated and desulfurized can be introduced into the waste liquid tank by means of a waste liquid supply pipe.
Detailed description of preferred embodiments
Fig. 2 schematically illustrates a built-in system for implementing the desulfurization waste liquid treatment method of the natural draft wet cooling tower of the present invention.
As shown in fig. 2, the natural draft wet cooling tower includes: a cooling tower housing 11, a support column 12 supporting the cooling tower housing, an air inlet 13 below the cooling tower housing 11, and an air outlet 14 at the top of the cooling tower housing 11. The water receiver 15, the water spraying device 16, the water spraying filler 17 and the water collecting tank 18 are sequentially arranged from top to bottom in the natural ventilation wet cooling tower.
The natural draft wet cooling tower based built-in desulfurization waste liquid treatment system 10 includes a closed evaporation tower 20 positioned within the natural draft wet cooling tower. The closed evaporation tower 20 penetrates the water spray packing 17 and extends out of the water spray device 16.
The closed evaporation tower 20 may be placed on the floor of the sump 18 of the natural draft wet cooling tower.
The closed vaporization tower 20 includes: an inlet 21, an outlet 22, a waste liquid pool 23, an evaporation tower spraying device 24, a pump 25 and a heat exchanger 26.
The inlet 21 of the closed type evaporation tower 20 is provided at the outer side of the closed type evaporation tower 20 away from the center, and is formed of a ventilation duct and extends to the outer side of the air intake 13 of the natural draft wet type cooling tower to communicate with the ambient air. The outlet 22 of the closed evaporation tower 20 is located at the top of the closed evaporation tower 20 and is arranged above the shower device 16. The outlet of the closed evaporation tower 20 is in communication with the internal environment of the natural draft wet cooling tower. The air pressure at the inlet 21 of the closed evaporator 20 is at atmospheric pressure (which may be approximately 0 Pa) and the air pressure at the outlet 22 of the closed evaporator 20 is negative, so that when no fan is providing power, air also flows into the evaporator, which achieves the energy saving purpose. Preferably, the closed evaporation tower 20 is located at the outside of the natural draft wet cooling tower away from the center, further facilitating air ingress.
Further, an outlet 22 of the closed evaporation tower 20 is provided between the water receiver 15 of the natural draft wet cooling tower and the shower device 16. The closed evaporator tower 20 also includes an additional water receiver 27 positioned between the evaporator tower spray apparatus 24 and the outlet 22. The water receiver 15 of the natural ventilation wet cooling tower and the water receiver 27 of the closed evaporation tower 20 play a double protection role, and can effectively prevent the natural ventilation wet cooling tower and circulating water thereof from being polluted by desulfurization waste liquid drips in the closed evaporation tower 20.
The waste liquid pool 23 is located at the bottom of the closed type evaporation tower 20. The closed evaporation tower 20 further includes a waste liquid supply pipe P, which is introduced from an inlet 21, and introduces desulfurization waste liquid to be evaporated into a waste liquid pool 23.
The evaporator spray apparatus 24 is located in the upper portion of the closed evaporator 20 below the outlet 22. The pump 25 is connected at one end to the waste liquid circulation pipe WP provided at the waste liquid pool 23 and at the other end to the evaporation tower spraying device 24. A heat exchanger 26 is provided below the evaporation tower spray device 24, the heat exchanger 26 being supplied with water by the shower device 16 and indirectly exchanging heat with the desulfurization waste liquid sprayed by the evaporation tower spray device 24.
The heat exchanger 26 takes the form of a heat exchange coil including a water inlet PI and a water outlet PO, the water inlet PI of the heat exchanger 26 being fed by the shower device 16.
Specifically, in the in-house desulfurization waste liquid treatment system 10 based on a natural draft wet type cooling tower shown in fig. 2, the water inlet PI of the heat exchanger 26 is connected to the water distribution pipe of the shower device 16, and the water outlet PO of the heat exchanger 26 protrudes outside the closed type evaporation tower 20 and is connected back to the water distribution pipe of the shower device 16.
Preferably, the closed type evaporation tower 20 further includes an evaporation tower packing 29 between the evaporation tower spraying device 24 and the heat exchanger 26, and the desulfurization waste liquid sprayed by the evaporation tower spraying device 24 passes through the evaporation tower packing to form a water film before being heat-exchanged with the high-temperature circulating water supplied to the heat exchanger 26 in the form of a heat exchanging coil by the water spraying device 16, so that the evaporation efficiency of the desulfurization waste water is high.
In addition, the closed vaporization tower 20 may further include a preheater (not shown) disposed at the inlet 21 to preheat the air flow entering the closed vaporization tower 20, further improving vaporization efficiency. Preferably, the closed vaporization tower 20 may also include a fan (not shown) disposed at the inlet 21 to further accelerate the air flow.
In the example shown in fig. 2, the desulfurization waste liquid is sprayed from the evaporation tower spraying device 24 onto the evaporation tower packing 29, falls onto the heat exchanger 26 in the form of a heat exchange coil, falls onto the waste liquid pool 23, and then returns to the evaporation spraying device 24 under the action of the pump 25, realizing a circulation flow. Ambient air introduced from inlet 21 escapes from outlet 22 after passing upwardly through heat exchanger 26 in the form of heat exchange coils, evaporator packing 29, spray zone and water receiver 27. On the one hand, in the circulating flow process, the desulfurization waste liquid continuously absorbs the heat of the high-temperature circulating water in the heat exchange coil, and the temperature of the desulfurization waste liquid gradually rises until the theoretical maximum temperature is approached. On the other hand, the ambient air introduced from the inlet 21 is heated up to hot air through the heat exchange coil, and the hot air heated by the heat exchange coil exchanges heat with the desulfurization waste liquid in the form of a water film in the evaporation tower packing 29 additionally provided in the evaporation tower 20, and further, the hot air exchanges heat with the sprayed desulfurization waste liquid in the spray zone. The whole process ensures that the evaporation efficiency of the desulfurization waste liquid is high.
Second preferred embodiment
Fig. 3 schematically illustrates an external system for implementing the desulfurization waste liquid treatment method of the natural draft wet cooling tower of the present invention.
In general, as shown in fig. 3, a natural draft wet cooling tower includes: a cooling tower casing 101, a strut 102 supporting the cooling tower casing, an air inlet 103 below the cooling tower casing 101, and an air outlet 104 at the top of the cooling tower casing 101. A water receiver 105, a water spraying device 106, a water spraying filler 107 and a water collecting tank 108 are arranged in the natural ventilation wet cooling tower from top to bottom.
The external desulfurization waste liquid treatment system 100 based on a natural draft wet cooling tower includes a closed evaporation tower 200 disposed within the natural draft wet cooling tower. The closed evaporation tower 200 includes: an inlet 201, an outlet 202, a waste tank 203, an evaporation tower spray 204, a pump 205, and a heat exchanger 206.
Referring to fig. 3, an inlet 201 of the closed type evaporation tower 200 is provided on a sidewall of a lower portion of the closed type evaporation tower 200 to communicate with ambient air. In an embodiment, the inlet 201 of the closed vaporization tower 200 may be an opening provided on a sidewall of a lower portion of the closed vaporization tower 200. In an alternative embodiment, the inlet 201 of the closed vaporization tower 200 is formed by one or more ventilation ducts connected to the side wall of the lower portion of the closed vaporization tower 200. A plurality of ventilation ducts are spaced along the side wall of the lower portion of the closed type evaporation tower 200.
The outlet 202 of the closed evaporation tower 200 is disposed above the water drenching device 106 and is in communication with the internal environment of the natural draft wet cooling tower. Preferably, the outlet 202 of the closed evaporation tower 200 is arranged between the water receiver 105 of the natural draft wet cooling tower and the water drenching device 106. In an alternative embodiment, the outlet 202 of the closed evaporation tower 200 may also be arranged above the water receiver 105.
The inlet 201 of the closed evaporation tower 200 communicates with ambient air, and the air pressure at the inlet 201 is atmospheric (may be approximately 0 Pa). The outlet 202 of the closed evaporation tower 200 is in air communication with the upper portion of the natural draft wet cooling tower, the air pressure at the outlet 202 being negative. Thus, in the absence of fan power, the pressure differential at the inlet 201 and outlet 202 of the closed-form evaporator 200 causes the natural flow of air into the evaporator, which achieves energy savings.
The evaporator spray apparatus 204 is located in the upper portion of the closed evaporator 200 below the outlet 202. The pump 205 has one end connected to the waste liquid circulation pipe WP provided at the waste liquid tank 203 and the other end connected to the evaporation tower spraying device 204, and realizes circulation of the desulfurization waste water in the closed type evaporation tower 200. A heat exchanger 206 is disposed below the evaporation tower spray apparatus 204, the heat exchanger 206 being supplied with water by the shower apparatus 106 and indirectly exchanging heat with the desulfurization waste liquid sprayed by the evaporation tower spray apparatus 204.
The heat exchanger 206 is in the form of a heat exchange coil, and comprises a water inlet P1 and a water outlet P2, wherein the water inlet P1 of the heat exchanger 206 is supplied by the water spraying device 106.
Specifically, in the external desulfurization waste liquid treatment system 100 based on a natural draft wet type cooling tower shown in fig. 3, the water inlet P1 of the heat exchanger 206 is connected to the water distribution pipe of the water shower device 106, and the water outlet P2 of the heat exchanger 206 protrudes outside the closed type evaporation tower 200 and discharges water into the water collection tank 108.
The closed evaporation tower 200 further comprises a further water receiver 207 located between the evaporation tower spray 204 and the outlet 202. The water receiver 105 of the natural ventilation wet cooling tower and the water receiver 207 of the closed evaporation tower 200 play a double protection role, and can effectively prevent the natural ventilation wet cooling tower and circulating water thereof from being polluted by the desulfurization waste liquid drips in the closed evaporation tower 200.
The closed evaporation tower 200 is connected to a natural draft wet cooling tower by a top air guide duct 208.
The closed type evaporation tower 200 further comprises an evaporation tower filler 209 positioned between the evaporation tower spraying device 204 and the heat exchanger 206, wherein the desulfurization waste liquid sprayed by the evaporation tower spraying device 204 passes through the evaporation tower filler to form a water film, and the desulfurization waste liquid exchanges heat with high-temperature circulating water in the heat exchanger 206 in a water film form and a heat exchange coil form, so that the evaporation efficiency of the desulfurization waste water is high.
The closed evaporation tower 200 further comprises an upper wind tunnel 210. In one embodiment, the air duct 210 takes the form of a cylinder, and the diameter of the air duct 210 is constant in the height direction. However, the present invention is not limited thereto. For example, in an alternative embodiment, the air duct 210 may also be in the form of a truncated cone.
In the example shown in fig. 3, the desulfurization waste liquid is sprayed from the evaporation tower spraying device 204 onto the evaporation tower packing 209, falls onto the heat exchanger 206 in the form of a heat exchange coil, falls onto the waste liquid tank 203, and then returns to the evaporation spraying device 204 by the pump 205, realizing a circulation flow. Ambient air introduced from inlet 201 escapes from outlet 202 via air duct 208 after passing upwardly through heat exchanger 206 in the form of heat exchange coils, evaporator packing 209, spray zone and water receiver 207. On the one hand, in the circulating flow process, the desulfurization waste liquid continuously absorbs the heat of the high-temperature circulating water in the heat exchange coil, and the temperature of the desulfurization waste liquid gradually rises until the theoretical maximum temperature is approached. On the other hand, the ambient air introduced from the inlet 201 is heated up to hot air through the heat exchange coil, and the hot air heated through the heat exchange coil exchanges heat with the desulfurization waste liquid in the form of a water film in the evaporation tower packing 209 additionally arranged in the evaporation tower, and further, the hot air exchanges heat with the sprayed desulfurization waste liquid in the spraying area. The whole process ensures that the evaporation efficiency of the desulfurization waste liquid is high.
The closed vaporization tower 200 may further include a preheater 211 disposed at the inlet 201 to preheat the air stream entering the closed vaporization tower 200 to further enhance vaporization efficiency. Preferably, the closed evaporation tower 200 may also include a fan (not shown) disposed at the inlet 201 to further accelerate the air flow, facilitating the air intake.
The waste liquid tank 203 is located at the bottom of the closed evaporation tower 101. The closed type evaporation tower 200 further includes a waste liquid supply pipe P that introduces desulfurization waste liquid to be evaporated into the waste liquid tank 203.
Although certain exemplary embodiments and implementations have been described herein, as will be appreciated by those of ordinary skill in the art, the drawings and descriptions are exemplary and not limiting, and the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the invention. Accordingly, the present inventive concept is not limited to such embodiments, but rather is limited to the broad scope of the appended claims and the various obvious modifications and equivalent arrangements that will be apparent to those skilled in the art.
Claims (5)
1. A desulfurization waste liquid treatment method based on a natural draft wet cooling tower, the natural draft wet cooling tower comprising: the cooling tower shell, support the pillar of cooling tower shell, air intake below the cooling tower shell and the air outlet that is located the top department of cooling tower shell, the water receiver that arranges in proper order from the top down in natural draft wet cooling tower, drenching device, drenching packing and water collecting tank, its characterized in that, the method includes:
building a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower filler, a pump and a heat exchanger, and the outlet of the closed evaporation tower is arranged between a water receiver and a water spraying device of a natural ventilation wet cooling tower;
supplying high-temperature circulating water of the natural draft wet cooling tower to the heat exchanger;
the desulfurization waste liquid is supplied to the evaporator spraying device from the waste liquid pool by a pump, sprayed onto the filler of the evaporation tower by the evaporator spraying device, subjected to heat exchange by the heat exchanger, returned to the waste liquid pool, and circulated in a reciprocating manner;
the ambient air introduced from the inlet is subjected to heat exchange upwards through the heat exchanger, the hot air is subjected to heat exchange upwards with the desulfurization waste water in the evaporation tower filler in a water film mode, and the hot air is continuously subjected to heat exchange upwards in a spraying area with the desulfurization waste liquid sprayed by the evaporator spraying device;
the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes upwards from the outlet to the position above the water spraying device of the natural ventilation wet cooling tower.
2. The method for treating desulfurization waste liquid based on a natural draft wet cooling tower according to claim 1, wherein said constructing a closed type evaporation tower further comprises:
arranging the inlet of the closed evaporation tower in communication with the outside ambient air;
an outlet of the closed evaporation tower is arranged in communication with the interior ambient air above a water spray zone of the natural draft wet cooling tower.
3. The desulfurization waste liquid treatment method based on a natural draft wet type cooling tower according to any one of claims 1 to 2, wherein the construction of the closed type evaporation tower further comprises:
the closed evaporation tower is arranged inside or outside the natural ventilation wet cooling tower.
4. The natural draft wet cooling tower based desulfurization waste liquid treatment method according to any one of claims 1 to 2, further comprising: the ambient air introduced from the inlet is preheated by means of a preheater.
5. The natural draft wet cooling tower based desulfurization waste liquid treatment method according to any one of claims 1 to 2, further comprising: the pretreated desulfurization waste liquid to be evaporated is introduced into the waste liquid pool by means of a waste liquid supply pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210191633.XA CN114573062B (en) | 2022-02-28 | 2022-02-28 | Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210191633.XA CN114573062B (en) | 2022-02-28 | 2022-02-28 | Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower |
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| WO2007143798A1 (en) * | 2006-06-16 | 2007-12-21 | Richard Hunwick | Systems and methods for conserving water, cooling tower and heat exchanger |
| CN106629946A (en) * | 2016-12-05 | 2017-05-10 | 中国电力工程顾问集团中南电力设计院有限公司 | Desulfurization wastewater treatment integrated facility and desulfurization wastewater treatment method applicable to indirect air-cooling towers |
| CN110240212A (en) * | 2019-07-09 | 2019-09-17 | 青岛达能环保设备股份有限公司 | A kind of waste water evaporation concentration system and technique based on low temperature spray desulfurization |
| CN112456586A (en) * | 2020-10-26 | 2021-03-09 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower |
| CN112607809A (en) * | 2020-12-11 | 2021-04-06 | 杭州蕴泽环境科技有限公司 | Desulfurization wastewater concentration system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007143798A1 (en) * | 2006-06-16 | 2007-12-21 | Richard Hunwick | Systems and methods for conserving water, cooling tower and heat exchanger |
| CN106629946A (en) * | 2016-12-05 | 2017-05-10 | 中国电力工程顾问集团中南电力设计院有限公司 | Desulfurization wastewater treatment integrated facility and desulfurization wastewater treatment method applicable to indirect air-cooling towers |
| CN110240212A (en) * | 2019-07-09 | 2019-09-17 | 青岛达能环保设备股份有限公司 | A kind of waste water evaporation concentration system and technique based on low temperature spray desulfurization |
| CN112456586A (en) * | 2020-10-26 | 2021-03-09 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower |
| CN112607809A (en) * | 2020-12-11 | 2021-04-06 | 杭州蕴泽环境科技有限公司 | Desulfurization wastewater concentration system and method |
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