CN114573062A - 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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- CN114573062A CN114573062A CN202210191633.XA CN202210191633A CN114573062A CN 114573062 A CN114573062 A CN 114573062A CN 202210191633 A CN202210191633 A CN 202210191633A CN 114573062 A CN114573062 A CN 114573062A
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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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Abstract
The invention discloses a desulfurization waste liquid treatment method based on a natural draft wet cooling tower, which comprises the following steps: constructing a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower packing, a pump and a heat exchanger; supplying high-temperature circulating water of the natural ventilation wet cooling tower to a heat exchanger; the desulfurization waste liquid is supplied to an evaporator spraying device from a waste liquid pool by a pump, is sprayed onto the filler of the evaporation tower by the evaporator spraying device, exchanges heat by a heat exchanger, returns to the waste liquid pool, and is circulated in a reciprocating manner; the ambient air introduced from the inlet exchanges heat upwards through the heat exchanger, the hot air exchanges heat upwards with the desulfurization wastewater in the filler of the evaporation tower in a water film mode, and continuously exchanges heat upwards with the desulfurization waste liquid sprayed by the spraying device of the evaporator in the spraying area; the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes from the outlet upwards.
Description
Technical Field
The invention relates to 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 draft cooling tower is an industrial cooling device, and is widely applied to thermal power plants. According to the cooling method, the natural draft cooling tower can be divided into a wet cooling tower and an indirect air cooling tower. The wet cooling tower discharges waste heat contained in high-temperature water into the atmosphere by utilizing evaporation through the direct contact between air and water; in the indirect air cooling tower, high-temperature water circularly flows in a pipeline in the radiator, and waste heat contained in the high-temperature water is discharged into the atmosphere by using the air cooling radiator. The wet cooling tower is widely applied to the south and northeast areas of China, and the indirect air cooling tower is widely applied to the northwest area where water resources are in short supply. The method is divided into a wet conventional cooling tower and a wet high-level water-collecting cooling tower according to whether a water collecting tank exists or not.
In recent years, with the improvement of the environmental protection requirement of China, newly-built thermal power plants need to be synchronously built with a desulfurization device, the most widely-applied desulfurization method at present is a limestone-gypsum wet desulfurization process, and slurry is fully contacted with flue gas in the desulfurization process, so that the discharged water of a desulfurization system contains salt and heavy metal with higher concentration, and how to treat and utilize the water with the most serious pollution is the key for realizing the zero emission of waste liquid of the power plants.
The key step of treating the desulfurization waste liquid is to evaporate and crystallize the desulfurization waste liquid, and finally zero emission is achieved. The concentration and crystallization technology comprises the following steps: 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, takes 30t/h equipment as an example, and takes secondary softening precipitation pretreatment into consideration, so that the equipment investment cost is about 7000 to 7500 ten thousand yuan, and the cost for treating the desulfurization waste liquid is about 100 to 200 yuan/t.
In addition, in order to treat the desulfurization waste liquid, a thermal power plant usually needs to separately construct a desulfurization waste liquid facility, so that the occupied area is increased.
In order to solve the problem of high treatment cost of the desulfurization waste liquid, the Chinese patent application CN201611100990.1 filed by Zhang Chunlin et al, Nanfeng Power design institute, China Power engineering consultant group in 2016, 12, and 5 discloses an integrated facility for treating desulfurization waste liquid, which is suitable for an indirect air cooling tower. According to the invention, a mechanical draft 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 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, wet cooling towers are mostly used for cooling in southern and northeast China, but at present, a system or a method for treating desulfurization waste liquid by using a natural ventilation wet cooling tower does not exist.
The above information disclosed in this section is only for background understanding of the inventive concept and, therefore, may contain information that does not constitute prior art.
Disclosure of Invention
In order to solve the problems of high treatment cost, difficult implementation, easy pollution and the like of the desulfurization waste liquid in the prior art, the invention provides an innovative desulfurization waste liquid treatment method based on a natural ventilation wet cooling tower.
The invention provides a desulfurization waste liquid treatment method based on a natural draft wet cooling tower, which comprises the following steps:
constructing a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower packing, a pump and a heat exchanger;
supplying the 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, is sprayed onto the filler of the evaporation tower by the evaporator spraying device, exchanges heat by the heat exchanger, returns to the waste liquid pool, and circulates in a reciprocating way;
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 wastewater in the filler of the evaporation tower in a water film mode, and is continuously subjected to heat exchange upwards with the desulfurization waste liquid sprayed by the spraying device of the evaporator in the spraying area;
the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes from the outlet upwards.
In a preferred embodiment, the constructing a closed evaporation tower further comprises: placing an inlet of the closed evaporation tower in communication with outside ambient air; arranging an outlet of the closed evaporation tower in communication with the internal ambient air above the natural draft wet cooling tower water spray zone.
In a preferred embodiment, the constructing a closed evaporation tower further comprises: and arranging the closed evaporation tower inside or outside the natural draft 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: and introducing the pretreated desulfurization waste liquid to be evaporated into the waste liquid pool by means of a waste liquid supply pipe.
The desulfurization waste liquid treatment method based on the natural ventilation wet cooling tower has the following beneficial effects:
(1) and (5) 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 external 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 air naturally flows into the evaporation tower due to the pressure difference between the inlet and the outlet of the evaporation tower, and the purpose of energy conservation is achieved.
(2) And (4) utilizing waste heat. 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 drenching device of the natural ventilation wet cooling tower, the waste heat of the high-temperature circulating water in the natural ventilation cooling tower is fully utilized for evaporation, and the purpose of waste heat utilization is realized.
(3) The evaporation efficiency is high. The desulfurization waste liquid is supplied to the evaporation tower sprinkler from the waste liquid pool with the help of the pump, is sprayed to the evaporation tower filler by the evaporation tower sprinkler, drops to the heat exchange coil pipe, carries out heat exchange through the heat exchanger, drops again and returns to the waste liquid pool, so the circulation is reciprocal, and the circulation flow of the desulfurization waste liquid in the evaporation tower is realized. Ambient air introduced from the inlet upwards passes through the heat exchange coil, the evaporation tower filler, the spraying area and the water collector and then escapes from the outlet through the air guide pipe. On one hand, in the circulating flow process, the desulfurization waste liquid continuously absorbs the heat of high-temperature circulating water in the heat exchange coil, and the temperature of the desulfurization waste liquid gradually rises until the temperature approaches the theoretical highest temperature. On the other hand, the ambient air introduced from the inlet is heated upwards to hot air through the heat exchange coil, 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 filling area additionally arranged in the evaporation tower, and the hot air further exchanges heat with the sprayed desulfurization waste liquid in the spraying area. The whole process ensures that the desulfurization waste liquid has high evaporation efficiency.
(4) The cooling capacity is improved. Because partial circulating water of the natural draft wet cooling tower enters the heat exchange coil in the evaporation tower, the heat of the heat exchange coil is absorbed by the desulfurization waste liquid and the air, namely, the evaporation tower assists the natural draft cooling tower to cool the circulating water, and the cooling capacity of the system is improved.
(5) Near zero pollution: the arrangement of the double water collectors of the water collector of the natural ventilation wet cooling tower and the water collector of the closed evaporation tower plays a role in double protection, and the pollution of the desulfurization waste liquid in the natural ventilation wet cooling tower and the circulating water in the natural ventilation wet cooling tower caused by drifting can be effectively prevented.
(6) Is easy to implement. The closed evaporation tower is arranged outside the natural ventilation wet cooling tower, and the operability is strong.
(7) The investment cost is low and the operating cost is low.
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, together with the description, and 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 shows 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 shows 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 present invention are shown and described, simply by way of illustration.
The present 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 method for treating desulfurization waste liquid based on a natural draft wet cooling tower 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 fillers, a pump and a heat exchanger;
supplying high-temperature circulating water of the natural ventilation wet cooling tower to a heat exchanger;
the desulfurization waste liquid is supplied to an evaporator spraying device from a waste liquid pool by a pump, is sprayed onto the filler of the evaporation tower by the evaporator spraying device, exchanges heat by a heat exchanger, returns to the waste liquid pool, and is circulated in a reciprocating manner;
the ambient air introduced from the inlet exchanges heat upwards through the heat exchanger, the hot air exchanges heat upwards with the desulfurization wastewater in the filler of the evaporation tower in a water film mode, and continuously exchanges heat upwards with the desulfurization waste liquid sprayed by the spraying device of the evaporator in the spraying area;
the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes from the outlet upwards.
In one embodiment, constructing a closed evaporation tower further comprises: arranging an inlet of a closed evaporation tower to be in communication with outside ambient air; the outlet of the closed evaporation tower is arranged to communicate with the internal ambient air above the natural draft wet cooling tower water spray zone.
According to the present invention, the closed evaporation tower may be disposed 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 desulfurization waste liquid to be evaporated can be introduced into the waste liquid pool by means of a waste liquid supply pipe.
Preferred embodiment 1
Fig. 2 schematically shows 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 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 collector 15, the water spraying device 16, the water spraying filler 17 and the water collecting tank 18 are sequentially arranged in the natural draft wet cooling tower from top to bottom.
The built-in desulfurization waste liquid treatment system 10 based on the natural draft wet cooling tower comprises a closed evaporation tower 20 positioned in the natural draft wet cooling tower. The closed evaporation tower 20 penetrates through the water spraying packing 17 and extends out of the water spraying device 16.
The closed evaporation tower 20 may be placed on the bottom surface of the sump 18 of a natural draft wet cooling tower.
The closed evaporation tower 20 includes: inlet 21, outlet 22, waste reservoir 23, evaporation tower spray 24, pump 25 and heat exchanger 26.
The inlet 21 of the closed evaporation tower 20 is arranged on the outer side of the closed evaporation tower 20 far away from the center, and the inlet is composed of a ventilation pipeline and extends to the outer side of the air inlet 13 of the natural ventilation wet cooling tower so as to be communicated 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 water spraying 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 evaporation tower 20 is atmospheric (which may be approximately 0Pa) and the air pressure at the outlet 22 of the closed evaporation tower 20 is negative, so that when no fan is used for power supply, air flows into the evaporation tower, which achieves the purpose of energy saving. Preferably, the closed evaporation tower 20 is located outside of the center in the natural draft wet cooling tower, further facilitating the entry of air.
Further, the outlet 22 of the closed evaporation tower 20 is arranged between the water receiver 15 and the water spraying device 16 of the natural draft wet cooling tower. The closed evaporation tower 20 further comprises an additional water collector 27 located between the evaporation tower sprinkler 24 and the outlet 22. The water collector 15 of the natural draft wet cooling tower and the water collector 27 of the closed evaporation tower 20 play a double protection role, and the pollution of the desulfurization waste liquid in the closed evaporation tower 20 caused by floating drops in the natural draft wet cooling tower and the circulating water in the natural draft wet cooling tower can be effectively prevented.
A waste liquid pool 23 is located at the bottom of the closed evaporation tower 20. The closed evaporation tower 20 further comprises a waste liquid feed pipe P, which is introduced from the inlet 21, and introduces the desulfurization waste liquid to be evaporated into the waste liquid pool 23.
The evaporation tower sprinkler 24 is located in the upper portion of the closed evaporation tower 20 below the outlet 22. The pump 25 has one end connected to a waste liquid circulating pipe WP provided at the waste liquid tank 23 and the other end connected to the evaporation tower sprinkler 24. The heat exchanger 26 is disposed below the evaporation tower spraying device 24, and the heat exchanger 26 is supplied with water from the water spraying device 16 and performs indirect heat exchange with the desulfurization waste liquid sprayed from the evaporation tower spraying device 24.
The heat exchanger 26 is in the form of a heat exchange coil and includes a water inlet PI and a water outlet PO, and the water inlet PI of the heat exchanger 26 is supplied with water by the water spraying device 16.
Specifically, in the built-in desulfurization waste liquid treatment system 10 based on the natural draft wet cooling tower shown in fig. 2, the water inlet PI of the heat exchanger 26 is connected to the water distribution pipe of the water spray device 16, and the water outlet PO of the heat exchanger 26 extends out of the closed evaporation tower 20 and is connected to the water distribution pipe of the water return device 16.
Preferably, the closed evaporation tower 20 further comprises an evaporation tower packing 29 located 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 subjected to heat exchange with the high-temperature circulating water supplied to the heat exchanger 26 in the form of a heat exchange coil by the water spraying device 16, so that the desulfurization waste water is evaporated efficiently.
In addition, the closed evaporation tower 20 may further include a preheater (not shown) disposed at the inlet 21 to preheat the air stream entering the closed evaporation tower 20, further improving the evaporation efficiency. Preferably, the closed evaporation 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 spray device 24 onto the evaporation tower packing 29, drops onto the heat exchanger 26 in the form of a heat exchange coil, drops to the waste liquid pool 23, and then returns to the evaporation spray device 24 by the pump 25, achieving a circulating flow. Ambient air introduced from the inlet 21 passes upwardly through the heat exchanger 26 in the form of a heat exchange coil, the evaporation tower packing 29, the spray zone and the water receiver 27 before escaping from the outlet 22. On 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 temperature approaches the theoretical highest temperature. On the other hand, the ambient air introduced from the inlet 21 is heated upwards through the heat exchange coil to hot air, 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 arranged in the evaporation tower 20, and further the hot air exchanges heat with the sprayed desulfurization waste liquid in the spraying area. The whole process ensures that the desulfurization waste liquid has high evaporation efficiency.
Preferred embodiment two
Fig. 3 schematically shows an external system for implementing the desulfurization waste liquid treatment method of the natural draft wet cooling tower of the present invention.
Generally, as shown in fig. 3, a natural draft wet cooling tower includes: a cooling tower housing 101, a column 102 supporting the cooling tower housing, an air intake 103 below the cooling tower housing 101, and an air outlet 104 at the top of the cooling tower housing 101. The natural draft wet cooling tower is provided with a water collector 105, a water spraying device 106, a water spraying filler 107 and a water collecting tank 108 which are sequentially arranged from top to bottom.
The external desulfurization waste liquid treatment system 100 based on the natural draft wet cooling tower includes a closed evaporation tower 200 disposed in the natural draft wet cooling tower. The closed evaporation tower 200 includes: an inlet 201, an outlet 202, a waste reservoir 203, 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 evaporation tower 200 may be an opening provided on a sidewall of a lower portion of the closed evaporation tower 200. In an alternative embodiment, the inlet 201 of the closed evaporation tower 200 is formed by one or more ventilation ducts connected to the side wall of the lower part of the closed evaporation tower 200. A plurality of ventilation ducts are spaced along the side walls of the lower portion of the closed evaporation tower 200.
The outlet 202 of the closed evaporation tower 200 is disposed above the water spray 106 and is in communication with the interior 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 and the water spraying device 106 of the natural draft wet cooling tower. In an alternative embodiment, the outlet 202 of the closed evaporation tower 200 may also be arranged above the water collector 105.
The inlet 201 of the closed evaporation tower 200 is in communication with ambient air, and the air pressure at the inlet 201 is atmospheric pressure (which may be approximately 0 Pa). The outlet 202 of the closed evaporation tower 200 is in air communication with the upper part of the natural draft wet cooling tower, and the air pressure at the outlet 202 is negative. Therefore, when no fan is used for providing power, the pressure difference between the inlet 201 and the outlet 202 of the closed evaporation tower 200 enables air to naturally flow into the evaporation tower, and the purpose of energy conservation is achieved.
The evaporation tower sprinkler 204 is located at the upper portion of the closed evaporation tower 200 below the outlet 202. One end of the pump 205 is connected to a waste liquid circulating pipe WP arranged at the waste liquid tank 203, and the other end is connected to the evaporation tower spraying device 204, so that the circulation of the desulfurization waste water in the closed evaporation tower 200 is realized. The heat exchanger 206 is disposed below the evaporation tower spraying device 204, and the heat exchanger 206 is supplied with water by the water spraying device 106 and performs indirect heat exchange with the desulfurization waste liquid sprayed by the evaporation tower spraying device 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, and the water inlet P1 of the heat exchanger 206 is supplied with water by the water spraying device 106.
Specifically, in the external desulfurization waste liquid treatment system 100 based on the natural draft wet 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 spray device 106, and the water outlet P2 of the heat exchanger 206 protrudes to the outside of the closed evaporation tower 200 and discharges water into the water collection tank 108.
The closed evaporation tower 200 further comprises an additional water collector 207 located between the evaporation tower sprinkler 204 and the outlet 202. The water collector 105 of the natural draft wet cooling tower and the water collector 207 of the closed evaporation tower 200 play a double protection role, and the pollution of the desulfurization waste liquid in the closed evaporation tower 200 caused by the drift of the natural draft wet cooling tower and the circulating water in the natural draft wet cooling tower can be effectively prevented.
The closed evaporation tower 200 is connected to a natural draft wet cooling tower by a top air duct 208.
The closed evaporation tower 200 further comprises an evaporation tower filler 209 located between the evaporation tower spraying device 204 and the heat exchanger 206, the desulfurization waste liquid sprayed by the evaporation tower spraying device 204 forms a water film through the evaporation tower filler, and the desulfurization waste liquid exchanges heat with high-temperature circulating water in the heat exchanger 206 in the form of a heat exchange coil in the form of the water film, so that the evaporation efficiency of the desulfurization waste water is high.
The closed evaporation tower 200 also comprises an upper chimney 210. In one embodiment, the air duct 210 takes a cylindrical form, 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 desulfurized waste liquid is sprayed from the evaporation tower spray 204 onto the evaporation tower packing 209, drops onto the heat exchanger 206 in the form of a heat exchange coil, drops to the waste liquid tank 203, and then returns to the evaporation spray 204 under the action of the pump 205, achieving a circulating flow. Ambient air introduced from inlet 201 passes upwardly through heat exchanger 206 in the form of heat exchange coil, evaporative tower packing 209, spray area and water collector 207 before escaping from outlet 202 via air duct 208. On 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 temperature approaches the theoretical highest temperature. On the other hand, the ambient air introduced from the inlet 201 is heated upwards through the heat exchange coil to be hot air, 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 filler 209 area 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 desulfurization waste liquid has high evaporation efficiency.
The closed evaporation tower 200 may further include a preheater 211 disposed at the inlet 201 to preheat the air stream entering the closed evaporation tower 200 to further improve evaporation 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 to facilitate the air intake.
The waste liquid pool 203 is located at the bottom of the closed evaporation tower 101. The closed evaporation tower 200 further includes a waste liquid supply pipe P that introduces the desulfurization waste liquid to be evaporated into the waste liquid tank 203.
While certain exemplary embodiments and implementations have been described herein, as will be recognized by those of ordinary skill in the art, the figures and descriptions herein are illustrative and not restrictive, and the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The inventive concept is therefore not limited to this embodiment, but is to be defined by the full breadth of the appended claims and any and all modifications and equivalent arrangements which may 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 is characterized by comprising the following steps:
constructing a closed evaporation tower, wherein the closed evaporation tower comprises an inlet, an outlet, a waste liquid pool, an evaporator spraying device, evaporation tower packing, a pump and a heat exchanger;
supplying the 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, is sprayed onto the filler of the evaporation tower by the evaporator spraying device, exchanges heat by the heat exchanger, returns to the waste liquid pool, and circulates in a reciprocating way;
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 wastewater in the filler of the evaporation tower in a water film mode, and is continuously subjected to heat exchange upwards with the desulfurization waste liquid sprayed by the spraying device of the evaporator in the spraying area;
the desulfurization waste water continuously absorbs heat to evaporate, and water vapor formed by evaporation escapes from the outlet upwards.
2. The method of treating desulfurization waste liquid based on natural draft wet cooling tower according to claim 1, wherein said constructing the closed evaporation tower further comprises:
placing an inlet of the closed evaporation tower in communication with outside ambient air;
arranging an outlet of the closed evaporation tower in communication with the internal ambient air above the natural draft wet cooling tower water spray zone.
3. The method for treating desulfurization waste liquid based on natural draft wet cooling tower according to any one of claims 1 to 2, wherein the constructing of the closed evaporation tower further comprises:
the closed evaporation tower is arranged inside or outside the natural draft wet cooling tower.
4. The method for treating desulfurization waste liquid based on a natural draft wet cooling tower of 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 method for treating desulfurization waste liquid based on a natural draft wet cooling tower according to any one of claims 1 to 2, further comprising: and introducing the pretreated desulfurization waste liquid to be evaporated 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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| Publication Number | Publication Date |
|---|---|
| CN114573062A true CN114573062A (en) | 2022-06-03 |
| CN114573062B CN114573062B (en) | 2023-08-15 |
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Citations (5)
| 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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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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