CN212151961U - System for zero release of desulfurization waste water of carrier gas extraction and bypass flue evaporation - Google Patents

Abstract

The utility model belongs to the technical field of waste water treatment, concretely relates to system of desulfurization waste water zero release of carrier gas extraction and bypass flue evaporation, including pretreatment integration processing system, carrier gas extraction concentrated system and evaporation crystallization solidification system. A system of desulfurization waste water zero release of carrier gas extraction and bypass flue evaporation overcome prior art not enough, entire system possesses that the process is simple, require not high, product later maintenance expense low, can use low temperature heat source drive and to advantages such as temperature variation insensitivity to the raw water, can finally guarantee the complete evaporation to dryness of desulfurization waste water, as power plant's waste water treatment's terminal, really realize the zero release of power plant's waste water.

Description

System for zero release of desulfurization waste water of carrier gas extraction and bypass flue evaporation

Technical Field

The utility model belongs to the technical field of waste water treatment, concretely relates to system of desulfurization waste water zero release of carrier gas extraction and bypass flue evaporation.

Background

At present, the domestic desulfurization wastewater treatment process adopting a triple box (physical and chemical method) has the defects of more configured equipment, higher investment, high operation cost and larger equipment overhaul and maintenance amount, and the defects cause that although a plurality of power plants are provided with the desulfurization wastewater treatment device, the actual operation process has the conditions of high operation and maintenance cost, high failure rate and low operation rate. The triple box process needs to add various chemical agents to treat the wastewater, the dosing system is too complex, the long-term stable operation of the system is further influenced, particularly, dosing pipelines of lime milk, coagulant aids and flocculating agents are blocked frequently, and the daily maintenance workload is greatly increased. Meanwhile, the reaction speed of the traditional additive agent and the desulfurization wastewater is slow, the reaction time of the agent is limited by the change of water quality, and the emission requirement is difficult to achieve through the adjustment of the additive agent in a short time.

The purpose of the concentration treatment is to separate the wastewater into concentrated water and fresh water by a separation process. The fresh water has low salt content and better water quality and is recycled. The water amount of the concentrated water is reduced, and the concentrated water enters a subsequent crystallization system for further crystallization treatment. At present, distillation methods and membrane processes are commonly used in the concentration treatment method, wherein the distillation method mainly comprises MVR, MED and other processes, and the membrane process mainly comprises a reverse osmosis method, a nanofiltration method and a forward osmosis method. The distillation method has high recovery rate, but has high requirements on equipment materials, and generally adopts titanium materials, so the investment is large, the energy consumption is high, and in addition, the problems of scaling and corrosion at high temperature need to be particularly noticed. The reverse osmosis method has small investment and low energy consumption, but the recovery rate is relatively low. The forward osmosis process has a recovery rate which is approximately the same as that of the distillation process, but is not superior in terms of technical economy because of high equipment investment and high operation. In recent years, the treatment of desulfurization waste water by air humidification and dehumidification has been attracting attention, and particularly, the concentration of waste water by using low-grade heat energy (plant waste heat) and renewable energy (solar energy, wind energy, geothermal energy) is favored. The method has the advantages of simple process, low requirement on raw water, low later maintenance cost of products, application of low-temperature heat source drive, insensitivity to temperature change and the like.

The evaporation pond in the curing treatment process is based on natural evaporation, is simple and practical, but is obviously influenced by factors such as seasons, temperature and the like, and the treatment capacity is obviously insufficient; the cost of the membrane concentration process is high, the failure rate of equipment is high, the occupied area is large, the forward osmosis technology is less researched at home at present, and the product also has the problems of low rejection rate of some pollutants, large concentration polarization in a supporting layer, high manufacturing cost and the like; although the mechanical atomization evaporation technology has low cost and large treatment capacity, the salt pollution of the surrounding environment caused by the loss of wind blowing is a key for restricting the development of the mechanical atomization evaporation technology; the evaporative concentration crystallization technology utilizes hot steam to evaporate the wastewater, the process system is complex, the investment operation cost is high, and in the actual operation process, the NaCl crystallized salt obtained by the salt separation process is low in quality, contains partial trace harmful elements and has hidden danger of becoming hazardous waste, and the economy and the applicability of the NaCl crystallized salt are to be further evaluated. The high-temperature bypass flue gas evaporation technology is provided with an independent evaporator, so that the desulfurization wastewater is completely evaporated to dryness, and the high-temperature bypass flue gas evaporation technology can be used as a terminal for wastewater treatment of a power plant, and the zero discharge of the wastewater of the power plant is really realized.

SUMMERY OF THE UTILITY MODEL

For solving the defects of the prior art, the utility model provides a system for zero discharge of desulfurization wastewater of carrier gas extraction and bypass flue evaporation.

The utility model discloses a realize through following technical scheme:

a system for zero discharge of desulfurization wastewater of carrier gas extraction and bypass flue evaporation comprises a pretreatment integrated treatment system, a carrier gas extraction concentration system and an evaporation crystallization solidification system;

the pretreatment integrated treatment system comprises integrated treatment equipment (1), a spiral dosing machine (2) and a clear water tank (3);

the carrier gas extraction and concentration system comprises a heat recovery system and a humidification-dehumidification system, wherein the heat recovery system comprises a low-temperature economizer (5) and a heat exchange water tank (4), and the humidification-dehumidification system comprises a dehumidifier (14) and a cooling water tank (11);

the evaporative crystallization solidification system comprises a bypass flue evaporator (12) and a dust remover (13);

the integrated treatment equipment (1) is respectively connected with a wastewater buffer tank (16), a spiral dosing machine (2) and a clear water tank (3), the clear water tank is sequentially connected with a heat exchange water tank (4) and a low-temperature economizer (5), a fan (6), a coil heater (7), an ejector (8), an ultrasonic atomizer (9) and a condenser (10) are arranged inside a dehumidifier (14), the low-temperature economizer (5) is respectively connected with the coil heater (7) and the ultrasonic atomizer (9) through a feeding pump, the upper end of the condenser (10) is connected with the heat exchange water tank, and the lower end of the condenser is connected with a cooling water tank (11); the dehumidifier (14) is sequentially connected with a sludge pump (18), a bypass flue evaporator (12) and a dust remover (13).

Preferably, the coil heater (7) is a double-row coil heater, the outer diameter is 12.5, and the thickness is 2 mm.

Preferably, the bypass flue evaporator (12) is provided with a double-fluid high-efficiency atomizing spray head.

Preferably, the end of the dehumidifier is provided with a groove.

The wastewater treatment method of the system comprises the following steps:

(1) filtering the desulfurization wastewater and a high-efficiency polymer flocculant discharged from the spiral dosing machine, and feeding the filtered desulfurization wastewater into a clear water tank;

(2) the low-temperature desulfurization waste water of the clean water tank flows through the heat exchange water tank to be heated for the first time and then enters a low-temperature economizer which is arranged in a tail flue at the outlet of an air preheater of the boiler, part of heat of the boiler is recovered to heat the desulfurization waste water for the second time, and the desulfurization waste water enters a humidifying-dehumidifying system;

(3) air entering a fan (6) is heated by a coil heater (7) to become hot air, high-temperature desulfurization waste water is sprayed down from the upper end by an ejector (8) and is directly contacted with wet air flowing from the side in a cross flow mode, then the desulfurization waste water is evaporated into the air by an ultrasonic atomizer (9) to become high-temperature wet air, and cooling water is sprayed down from the upper part of a filler by a condenser (10) to exchange heat with the high-temperature wet air. At the moment, the hot air is cooled, the temperature is reduced, fresh water is separated out, and the separated fresh water and the cooling water are fused and then enter a cooling water tank (11) along with the filler;

(4) the residual concentrated water enters a bypass flue evaporator (12), a bypass is led out from a denitration outlet by the bypass flue evaporator, 3% -5% of high-temperature flue gas is led in from an inlet of an air preheater (17), the led-in high-temperature flue gas is rapidly vaporized and evaporated to the concentrated desulfurization wastewater, salt substances contained in the desulfurization wastewater are continuously separated out in the evaporation process, are attached to dust particles in the flue gas, enter a dust remover through an outlet of a bypass flue crystallizer and are trapped by the dust remover, and finally zero discharge of the desulfurization wastewater is realized.

Preferably, the temperature of the high-temperature flue gas in the step (4) is 300-350 ℃.

Preferably, the temperature of reheating of the low-temperature economizer in the step (2) is 80-90 ℃.

Advantageous effects

(1) A system and method of desulfurization waste water zero release of carrier gas extraction and bypass flue evaporation overcome prior art not enough, entire system possesses that the process is simple, not high, product later maintenance expense low, can use low temperature heat source drive and to advantages such as temperature variation insensitivity to the raw water requirement, can finally guarantee the complete evaporation to dryness of desulfurization waste water, as power plant's waste water treatment's terminal, really realize the zero release of power plant's waste water.

(2) The pretreatment integrated treatment system has the advantages that the equipment investment is less, the required space is small, the limitation of wastewater treatment equipment on the spatial position can be overcome, the installation in a desulfurization process system is modularized, after a high-efficiency flocculating agent is added, the heavy metal adsorption, coagulation, flocculation and sedimentation separation processes are rapidly completed in the system, pollutants such as suspended matters, heavy metals, chemical oxygen consumption, fluorides, sulfides and the like are removed, the stable operation of the desulfurization wastewater treatment system is ensured, and the effluent meets the discharge requirement. The prepared high-efficiency flocculating agent (polyaluminium chloride and polyacrylamide) is applied in the link, and flocculation and precipitation can be rapidly completed, and flocculation can be realized in 1-3 min generally. And forms a stable complex with the heavy metal, and can stabilize more than 87% of the heavy metal. The formed flocculating particles have certain polarity and have the unique characteristics of capturing and adsorbing fine suspended particles in the wastewater, the efficient flocculating agent which captures and adsorbs the fine particles forms a net-like structure, other fine suspended particles are further captured and adsorbed, a virtuous cycle is formed, and the wastewater contains fine suspended particles and is captured and adsorbed together to form large solid particles which have larger specific gravity and are easy to settle when the particles are longer and larger, so that the excellent solid-liquid separation effect is embodied. The integrated efficient flocculation technology only needs to add one treatment agent, and the agent is formed by compounding nontoxic and harmless conventional treatment agents, so that the management risk caused by using various dangerous chemicals in a three-header process is avoided. Meanwhile, the flocculating agent contains lime powder, so that the content of fluoride in the desulfurization wastewater can be effectively removed.

(2) Compared with the traditional treatment method, the desulfurization wastewater treatment method of the humidification-dehumidification system in the carrier gas extraction concentration system has the following advantages: 1) the equipment structure is simple and reliable, the early investment and the later maintenance cost are low, and the economic performance is good; 2) the equipment works at normal pressure, the heating temperature of the raw materials is more than 80-90 ℃, and low-grade heat energy (factory waste heat) and renewable energy sources (solar energy, wind energy and geothermal energy) can be used according to different production environments; 3) the device is suitable for small-scale production and is suitable for some occasions with small scale, and even if the production scale is large, the humidifying-dehumidifying equipment can be connected in series for production. The existing design needs external heat sources such as solar energy and electric energy, and the heat source of the system exchanges heat by utilizing the heat energy replaced by the low-temperature economizer so as to achieve the purposes of energy conservation and heat exchange; the system is completed in one device, and an ultrasonic humidifier is added in the second stage of humidification, so that the impact of air and water molecules can be increased, and the humidification rate is improved. The method is completed in one device, so that the space is saved, the installation difficulty is reduced, and the loss of heat energy is reduced because the transmission distance is short in one device

(3) The high-temperature bypass flue evaporation system adopted by the utility model realizes the high-efficiency evaporation of the desulfurization wastewater, does not need an additional heat source, and has low operation energy consumption; and the bypass flue can fully utilize the gap between the flues, the occupied area is small, and the engineering investment is saved. Meanwhile, the safety problems of corrosion and ash blockage of the flue, blockage of the dust remover and the like are avoided, the complete set of device is completely independent and separated from the host, online maintenance is easy, and potential safety hazards are avoided. The PLC system that is equipped with degree of automation is high, convenient operation, and the particle diameter of steerable atomizing nozzle, compressed air volume carry out effective control, seek the best operating condition when waste water yield quality of water changes, have improved the operation and maintenance level of system. The high-temperature bypass flue evaporation system can realize zero emission of desulfurization wastewater in the real sense of a coal-fired power plant, has small influence on the quality of an air preheater, fly ash and the like, and is a low-consumption and high-efficiency desulfurization wastewater zero emission technology.

Drawings

FIG. 1 is a schematic diagram of the overall system architecture;

FIG. 2 is a schematic view of a carrier gas extraction concentration system;

FIG. 3 is a schematic view of an evaporative crystallization solidification system;

in fig. 1: 1. an integrated processing device; 2. a spiral dosing machine; 3. a clear water tank; 4. a heat exchange water tank; 5. a low-temperature economizer; 6. a fan; 7. a coil heater; 8. an ejector; 9. an ultrasonic atomizer; 10. a condenser; 11. a cooling water tank; 12. a bypass flue evaporator; 13. a dust remover; 14. a dehumidifier; 15. a boiler; 16. a wastewater buffer tank; 17. an air preheater; 18. a sludge discharge pump; 19. a feed pump; 20. sludge; 21. hot flue gases; 22. wet air, 23, drain, 24, temperature sensor; 25. a humidity sensor; 26. a groove; 27. air.

Detailed Description

In order to further illustrate the technical means and effects of the present invention for achieving the objectives of the present invention, the following embodiments are combined with the accompanying drawings and preferred embodiments to further illustrate the specific embodiments, structures, features and effects of a system for treating desulfurization waste water by using waste heat of flue gas according to the present invention.

Example 1

A system for zero discharge of desulfurization wastewater of carrier gas extraction and bypass flue evaporation comprises a pretreatment integrated treatment system, a carrier gas extraction concentration system and an evaporation crystallization solidification system;

the pretreatment integrated treatment system comprises integrated treatment equipment (1), a spiral dosing machine (2) and a clear water tank (3);

the carrier gas extraction and concentration system comprises a heat recovery system and a humidification-dehumidification system, wherein the heat recovery system comprises a low-temperature economizer (5) and a heat exchange water tank (4), and the humidification-dehumidification system comprises a dehumidifier (14) and a cooling water tank (11);

the evaporative crystallization solidification system comprises a bypass flue evaporator (12) and a dust remover (13);

the integrated treatment equipment (1) is respectively connected with a wastewater buffer tank (16), a spiral dosing machine (2) and a clear water tank (3), the clear water tank is sequentially connected with a heat exchange water tank (4) and a low-temperature economizer (5), a fan (6), a coil heater (7), an ejector (8), an ultrasonic atomizer (9) and a condenser (10) are arranged inside a dehumidifier (14), the low-temperature economizer (5) is respectively connected with the coil heater (7) and the ultrasonic atomizer (9) through a feeding pump, the upper end of the condenser (10) is connected with the heat exchange water tank, and the lower end of the condenser is connected with a cooling water tank (11); the dehumidifier (14) is connected with the bypass flue evaporator (12) and the dust remover (13) in sequence.

The pretreatment integrated treatment system comprises: the technical scheme mainly combines the high-efficiency flocculating agent in the spiral dosing machine with the integrated equipment, and pollutants in water can be removed in a short time by adding the high-efficiency flocculating agent into the integrated treatment equipment through the spiral dosing machine.

The novel efficient flocculant is prepared by compounding PAC and PAM according to a certain proportion, the mass ratio is 1:3.5, the efficient flocculant is a powdery medicament material, and the efficient flocculant is uniformly mixed according to the mass ratio, so that suspended matters in water can be rapidly flocculated and settled, and solid-liquid separation is finally realized.

The integrated processing system comprises the following working procedures: and (3) the desulfurization wastewater reacts with the high-efficiency polymer flocculant from the spiral dosing machine under the stirring action of the submersible stirrer to form a stable heavy metal-high-efficiency flocculant complex. The key characteristics of the high-efficiency flocculating agent are that the high-efficiency flocculating agent is not dissolved in water before and after treatment, has a specific gravity larger than that of water, always exists in wastewater in the form of solid suspended matters, and is beneficial to subsequent precipitation separation; meanwhile, due to the wetting and polarity effects of water, the polymer chain is extended and unfolded and has certain polarity, the polymer chain has the unique characteristics of capturing and adsorbing fine suspended particles in the wastewater, the efficient flocculant which captures and adsorbs the fine particles forms a net-like structure, other fine suspended particles are further captured and adsorbed, a virtuous cycle is formed, the larger the particles are, the more the particles are, the wastewater containing the fine suspended particles is captured and adsorbed together to form large solid particles which have larger specific gravity and are easy to settle, and the large solid particles are rapidly settled in a settling tank, so that the excellent solid-liquid separation effect is realized. Meanwhile, the integral efficient flocculation technology has limited fluoride removal capacity, so that lime powder can be added in the reactor to reduce the fluoride content according to the fluoride content in the raw water of the desulfurization wastewater, so as to achieve the aim of removing the fluoride.

Subsequently, large solid particles in the desulfurization wastewater are rapidly settled, so that an excellent solid-liquid separation effect is embodied. The technical index of the effluent quality after the treatment of the treated effluent meets the specified requirement of the Wet desulphurization wastewater quality control index DL/T997-2006 standard.

And then, the sludge precipitated by the integrated processor is periodically discharged to sludge dewatering equipment for dewatering treatment.

The carrier gas extraction and concentration system comprises a heat recovery system and a humidification-dehumidification system, wherein the heat recovery system comprises a low-temperature economizer (5) and a heat exchange water tank (4), the humidification-dehumidification system comprises a dehumidifier (14) and a cooling water tank (11), and a fan (6), a coil heater (7), an ejector (8), an ultrasonic atomizer (9) and a condenser (10) are sequentially arranged in the dehumidifier;

the carrier gas extraction and concentration system is a closed air circulation unit, based on the humidification-dehumidification technology, desulfurization wastewater heated by a regenerative system enters the humidification-dehumidification system to change air into saturated wet steam, and then the wet steam is subjected to water-steam separation in a condensation section to generate low-salinity fresh water. The reflux heat enters the heat exchange water tank, and the concentrated water enters the bypass flue evaporator.

The carrier gas extraction and concentration system mainly comprises two parts: a regenerative system and a humidification-dehumidification system. The structure of the system is shown in fig. 2.

The heat recovery system mainly comprises a low-temperature economizer and a heat exchange water tank. Wherein the heat exchange water tank mainly comprises a water pump and a plate heat exchanger, and is mainly used for preheating desulfurization wastewater entering the system.

The low-temperature desulfurization wastewater entering the carrier gas extraction concentration system from the clear water tank flows through the heat exchange water tank to be heated for the first time, then enters the low-temperature economizer, the low-temperature economizer is installed in a tail flue at the outlet of the boiler air preheater, partial heat of the boiler is recovered to heat the desulfurization wastewater for the second time, and the desulfurization wastewater reaches 80-90 ℃ and enters the humidification-dehumidification system.

The humidifying-dehumidifying system consists of two stages of humidifying and one stage of dehumidifying. Mainly comprises a fan (6), a coil heater (7), an ejector (8), an ultrasonic atomizer (9) and a condenser (10).

The existing humidification and dehumidification system is formed by connecting two tanks in series, the system is completed in one device, and an ultrasonic humidifier is added in the second stage of humidification, so that the impact of air and water molecules can be increased, and the humidification rate is improved. Firstly, saved the space, reduced the installation degree of difficulty, secondly because in an equipment, the distance is short, has reduced the loss of heat energy.

The fan adopts a centrifugal fan.

The coil heater is characterized in that the outer pipe is made of copper, the outer diameter is 12.5, the thickness is 2mm, and the coil heater is arranged in double rows to increase the heat transfer area.

The humidification process employs two successive stages. In a first stage, spraying part of the water on the path of the hot air; air (27) entering the fan (6) is heated by the coil heater (7) to become hot air, high-temperature desulfurization waste water is sprayed down from the upper end by the ejector (8) and is in direct contact with wet air flowing from the side surface in a cross flow mode to perform heat and mass exchange. Since air itself has a certain capacity to carry water vapor and as the temperature increases, it carries more water vapor, becoming humid air. The wet air is heated by the high-temperature desulfurization waste water, and the wet air continuously absorbs moisture, so that the temperature and the moisture content of the wet air are increased. The distilled concentrate is then pumped to a next stage for humidification, where a small amount of water is present in the tank and is drained out of the apparatus through a drain valve (23) until the level of the water in the tank reaches 2/3. And in the second stage, the desulfurization wastewater is evaporated into the air through an ultrasonic atomizer (9) so as to improve the humidification rate. The ultrasonic atomizer (9) can increase the humidity of the air generated in the first stage under the condition of almost the same temperature as the water mist.

In the humidification-dehumidification system, cooling water is sprayed by a condenser (10) from above the packing to exchange heat with high-temperature humid air. At this time, the hot air is cooled to lower the temperature, and fresh water is precipitated. The separated fresh water and the cooling water are merged and then enter the cooling water tank (11) along with the filler. Since the water tank is full at first, all the excessive overflowing fresh water is the fresh water amount of the water produced by the humidifying-dehumidifying system. And the cooling water in the cooling tank will be sprayed again into the filling of the dehumidifier of the stage under the drive of the pump. The air circulation and the water circulation are closed circulation in the whole process. The condensed heat flows back into the heat exchange water tank to be used for preheating the desulfurization wastewater newly entering the system. The remaining concentrated water enters a bypass flue evaporator (12).

The temperature sensor and the humidity sensor sense the change of temperature and humidity when the device operates. The temperature sensor and the humidity sensor are calibrated and installed at respective positions and used for monitoring the temperature and humidity changes of the operation of the humidification-dehumidification system, so that the air inflow of the fan (6) and the spraying amount of the sprayer (8) are adjusted, the air mass flow is 0.4kg/s-0.6kg/s, and the hot water spraying ratio is 0.25-0.4.

The evaporative crystallization solidification system comprises a bypass flue evaporator (12) and a dust remover (13);

the evaporative crystallization solidification system comprises a bypass flue evaporator (12), a pipeline connected with the bypass flue evaporator, a dust remover (13) and a sludge pump (18). The concentrated desulfurization wastewater after passing through the humidification and dehumidification system is introduced into a bypass flue evaporator by a sludge discharge pump (18), the bypass flue evaporator leads out a bypass from a denitration outlet, 3% -5% of high-temperature hot flue gas (21) is introduced from an inlet of an air preheater, the introduced high-temperature hot flue gas is rapidly vaporized and evaporated to the concentrated desulfurization wastewater, and 100% of the concentrated desulfurization wastewater is subjected to total evaporation treatment in a high-temperature bypass evaporation chamber. The inlet and the outlet of the bypass flue evaporative crystallizer are respectively provided with a temperature sensor, so that the evaporation condition of the waste water is indirectly judged. An electric adjusting baffle is additionally arranged at the inlet of the bypass flue so as to adjust the flow and the flow speed of the flue gas and ensure the efficient evaporation of liquid drops. The evaporated water vapor enters the desulfurizing tower along with the flue gas, and the water for the desulfurizing process is indirectly supplemented after the water vapor is condensed in the desulfurizing tower, so that the zero discharge of the desulfurization wastewater is finally realized.

Claims (4)

1. A system for zero discharge of desulfurization wastewater of carrier gas extraction and bypass flue evaporation comprises a pretreatment integrated treatment system, a carrier gas extraction concentration system and an evaporation crystallization solidification system; it is characterized in that the preparation method is characterized in that,

the pretreatment integrated treatment system comprises integrated treatment equipment (1), a spiral dosing machine (2) and a clear water tank (3);

the carrier gas extraction and concentration system comprises a heat recovery system and a humidification-dehumidification system, wherein the heat recovery system comprises a low-temperature economizer (5) and a heat exchange water tank (4), and the humidification-dehumidification system comprises a dehumidifier (14) and a cooling water tank (11);

the evaporative crystallization solidification system comprises a bypass flue evaporator (12) and a dust remover (13);

the integrated treatment equipment (1) is respectively connected with a wastewater buffer tank (16), a spiral dosing machine (2) and a clear water tank (3), the clear water tank is sequentially connected with a heat exchange water tank (4) and a low-temperature economizer (5), a fan (6), a coil heater (7), an ejector (8), an ultrasonic atomizer (9) and a condenser (10) are arranged inside a humidifying-dehumidifying device (14), the low-temperature economizer (5) is respectively connected with the coil heater (7) and the ultrasonic atomizer (9) through a feeding pump (19), the upper end of the condenser (10) is connected with the heat exchange water tank, and the lower end of the condenser is connected with a cooling water tank (11); the dehumidifier (14) is sequentially connected with a sludge pump (18), a bypass flue evaporator (12) and a dust remover (13).

2. The system for zero emission of desulfurization waste water of carrier gas extraction and bypass flue evaporation as recited in claim 1, characterized in that said coil heater (7) is a double-row coil heater with 12.5 of outer diameter and 2mm of thickness.

3. The system for zero emission of desulfurization waste water of carrier gas extraction and bypass flue evaporation as recited in claim 1, characterized in that said bypass flue evaporator (12) is provided with a two-fluid high-efficiency atomizing nozzle.

4. The system for zero emission of desulfurization waste water of carrier gas extraction and bypass flue evaporation as claimed in claim 1, wherein the end of said dehumidifier is provided with a groove (26).

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