A desulfurization wastewater treatment system and method

Abstract

The present invention provides a treatment system and method for desulfurized wastewater. The treatment system includes a high-temperature flue gas pipeline, a dynamic wave scrubber and a scrubbing tower; the outlet of the high-temperature flue gas pipeline is connected to the gas phase inlet of the dynamic wave scrubber, and the gas phase outlet of the dynamic wave scrubber is connected to the gas inlet of the scrubbing tower; the sewage outlet of the dynamic wave scrubber is connected to the high-temperature flue gas pipeline through a circulating pump, and the dynamic wave scrubber is also provided with a desulfurized wastewater inlet as a liquid phase inlet. The treatment system utilizes the heat and mass transfer exchange between the high-temperature flue gas produced by the plant and the desulfurized wastewater in the dynamic wave scrubber in a cyclic manner to achieve the purpose of concentration. The treatment system has the advantages of short treatment process, low equipment cost, recovery of flue gas heat to reduce operating cost, and no wastewater scaling, etc., which solves the problems of long process flow, high operating difficulty, and very high investment and operating costs in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and in particular to a system and method for treating desulfurization wastewater. Background Art

[0002] "Limestone-gypsum" wet flue gas desulfurization wastewater is the difficulty of zero discharge of wastewater from power plants. Zero discharge of wastewater from power plants also mainly refers to zero discharge of desulfurization wastewater. The total salt content, chloride ion, hardness, suspended solids, and heavy metal content of wet flue gas desulfurization wastewater are very high, the reuse channels are very limited, and the treatment is also very difficult. Wet flue gas desulfurization wastewater treatment has become the focus of power plants.

[0003] However, there are many schools of thought on zero-emission technologies for desulfurization wastewater, and most of them are in the pilot and technical verification stages. Solving the problems of scaling, blockage, high energy consumption, and high cost in wastewater treatment is the current focus of industry research. Therefore, it is necessary to develop a safe, stable, low-cost zero-emission technology for wastewater.

[0004] At present, the processing principle of "(chemical softening + separation) + (membrane concentration / thermal concentration) + (evaporative crystallization / flue evaporation)" is generally adopted, such as the traditional MED process and MVR process. These processes have long flow, great difficulty in operation, and very high investment and operating costs.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The first purpose of the present invention is to provide a desulfurization wastewater treatment system, which utilizes the high-temperature flue gas produced by the plant and the desulfurization wastewater to achieve the purpose of concentration through cyclic heat and mass transfer in a dynamic wave scrubber. The treatment system has the advantages of short treatment process, low equipment cost, recovery of flue gas heat to reduce operating costs, and no wastewater scaling. It solves the problems of long process flow, high operating difficulty, and very high investment and operating costs in the prior art.

[0007] The second purpose of the present invention is to provide a method for treating desulfurization wastewater, which has the characteristics of short process, no complex and expensive equipment, ability to recover flue gas heat, and no scaling, and has significant advantages in the field of desulfurization wastewater treatment.

[0008] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0009] A desulfurization wastewater treatment system includes a high-temperature flue gas pipeline, a dynamic wave scrubber and a scrubbing tower;

[0010] The outlet of the high-temperature flue gas duct is communicated with the gas phase inlet of the power wave scrubber, and the gas phase outlet of the power wave scrubber is communicated with the gas inlet of the scrubbing tower;

[0011] The sewage outlet of the power wave scrubber is connected to the high-temperature flue gas pipeline through a circulation pump, and the power wave scrubber is also provided with a desulfurization wastewater inlet as a liquid phase inlet.

[0012] As mentioned above, the present invention only includes three main equipments: high temperature flue gas pipeline, dynamic wave scrubber and scrubber, and the high temperature flue gas pipeline and scrubber are usually the equipments owned by the desulfurization wastewater discharge plant (mainly power plant). Therefore, in order to treat the desulfurization wastewater with "zero" discharge, it is only necessary to add a dynamic wave scrubber.

[0013] The working principle of the above processing system is:

[0014] The high-temperature flue gas in the high-temperature flue gas pipeline enters the dynamic wave scrubber through the gas phase inlet of the dynamic wave scrubber, and the desulfurized wastewater enters the dynamic wave scrubber at the same time. The two (gas-liquid two-phase) directly contact and collide in countercurrent in the dynamic wave scrubber to carry out efficient heat and mass transfer (close to adiabatic evaporation). At this time, the water in the desulfurized wastewater evaporates into the flue gas, so that the desulfurized wastewater is dehumidified and concentrated, and the high-temperature flue gas is humidified and cooled. At this time, concentrated wastewater and low-temperature flue gas are obtained. The concentrated wastewater circulates to the high-temperature flue gas pipeline through the sewage outlet of the dynamic wave scrubber to contact the flue gas. On the one hand, it purifies the flue gas, and on the other hand, it enters the dynamic wave scrubber at the same time as the flue gas to be further concentrated. In this way, the desulfurized wastewater is continuously concentrated until it reaches the predetermined concentration (the conventional salt concentration is required to reach 40-50%). At the same time, the low-temperature flue gas generated enters the washing tower through the gas phase outlet of the dynamic wave scrubber and is discharged after being washed with condensed water.

[0015] The present invention utilizes the above working mechanism to achieve the following technical effects:

[0016] 1. During the treatment process, the treatment of desulfurization wastewater is not limited by parameters such as osmotic pressure, boiling point rise and local evaporation intensity. Therefore, the wastewater can be concentrated to a saturated state, which maximizes the concentration and reduction of wastewater and significantly reduces the subsequent evaporation and crystallization investment and operating costs.

[0017] 2. The present invention recycles the heat of the flue gas discharged from the power plant and uses it to concentrate the desulfurization wastewater, further reducing energy consumption and operating costs.

[0018] 3. The present invention utilizes the principle of "dynamic wave" to achieve heat exchange between flue gas and wastewater. This process is close to an "adiabatic" process and can maximize the use of flue gas heat, which further reduces energy consumption. At the same time, the wastewater in the dynamic wave scrubber is always in a "turbulent" state, so it is not easy to scale and will not corrode the equipment.

[0019] 4. The concentrated wastewater circulated to the flue gas duct usually increases the humidity of the flue gas by about 0.25% and reduces the flue gas temperature by about 4°C. At this time, the flue gas is in an unsaturated state, which is higher than the acid dew point and will not corrode the flue and electrostatic precipitator. On the contrary, due to the reduction in flue gas temperature, the resistivity of fly ash in the electrostatic precipitator is reduced, which is beneficial to improve the dust removal efficiency (a dust collector can be set up for dust removal before the high-temperature flue gas enters the dynamic wave scrubber).

[0020] 5. Since the present invention does not require a pretreatment stage and does not have problems such as scaling and corrosion, the system can operate stably for a long time and has significant cost advantages.

[0021] In summary, the treatment system of the present invention utilizes the high-temperature flue gas produced by the plant and the desulfurization wastewater to achieve the purpose of concentration through cyclic heat and mass transfer in the dynamic wave scrubber. The treatment system has the advantages of short treatment process, low equipment cost, recovery of flue gas heat to reduce operating costs, and no wastewater scaling. It solves the problems of long process flow, high operation difficulty, and very high investment and operating costs in the prior art.

[0022] The power wave scrubber used in the present invention is a conventional device, generally composed of four main parts: a scrubbing pipe, a nozzle, a scrubbing agent and a circulating pump. It uses liquid (desulfurization wastewater is used as liquid in the present invention) as a scrubbing agent, and directly contacts with a high-speed airflow (high-temperature flue gas is used as a high-speed airflow in the present invention) to achieve heat and mass transfer between the two phases, so as to achieve the process requirements of purifying (equivalent to concentrating in the present invention), cooling and humidifying the gas.

[0023] On this basis, the processing system can be further optimized as follows.

[0024] Preferably, the power wave scrubber is connected to a liquid level meter for detecting the liquid level height in the power wave scrubber.

[0025] A liquid level meter is provided to control the liquid level so as not to exceed the upper limit of the power wave scrubber.

[0026] Preferably, the washing tower is connected to a liquid level meter for detecting the liquid level height in the washing tower.

[0027] A liquid level meter is provided to control the liquid level so as not to exceed the upper limit of the washing tower.

[0028] Preferably, the washing tower is a packed washing tower.

[0029] The packed scrubber has low operating costs and is easy to operate.

[0030] Preferably, the washing tower is provided with a condensed water inlet and a washing produced water outlet, and the condensed water inlet and the washing produced water outlet are connected via a heat exchanger and a circulating pump.

[0031] Reduce energy and water consumption through water recycling.

[0032] Preferably, the washing tower has multiple condensate water inlets.

[0033] The number of condensate inlets is usually determined by the requirements of the scrubber.

[0034] Preferably, the heat exchanger is a plate heat exchanger.

[0035] The heat transfer efficiency of the plate heat exchanger is higher.

[0036] Preferably, the sewage outlet of the power wave scrubber is connected to the high-temperature flue gas pipeline through a circulation pump and a three-way valve in sequence;

[0037] The inlet of the three-way valve is connected to the circulation pump, and the two outlets are connected to the high-temperature flue gas pipeline and the concentrated salt collection pipe respectively.

[0038] The three-way valve is provided to facilitate recovery through the concentrated salt collection pipe when the concentrated wastewater concentration meets the requirements (for example, reaches a saturated state).

[0039] Preferably, the high-temperature flue gas duct is a flue gas exhaust duct of a boiler.

[0040] Preferably, the outlet of the high-temperature flue gas duct is connected to the gas phase inlet of the dynamic wave scrubber via a dust collector.

[0041] Before the high-temperature flue gas enters the dynamic wave scrubber, dust removal can achieve the following effects:

[0042] The concentrated wastewater circulated to the flue gas pipeline is sprayed into the flue, where the atomized concentrated brine is rapidly vaporized, and the solidified matter and ash in the wastewater are suspended in the flue gas and captured in the electrostatic precipitator along with the flue gas. The solid content in the concentrated brine is about 76kg / h (only the conventional concentration listed), which will not affect the physical properties and comprehensive utilization of the ash. On this basis, dust removal is also achieved, providing a favorable basis for the "zero" emission of flue gas.

[0043] The present invention also provides a treatment method matching the above-mentioned desulfurization wastewater treatment system, comprising the following steps:

[0044] Step A: high-temperature flue gas and desulfurized wastewater are subjected to heat and mass transfer in a dynamic wave scrubber to concentrate the desulfurized wastewater to obtain concentrated wastewater and low-temperature flue gas;

[0045] Step B: the concentrated wastewater is circulated back to contact with the high-temperature flue gas, and simultaneously re-enters the dynamic wave scrubber to transfer heat and mass with the desulfurized wastewater to concentrate the desulfurized wastewater to obtain concentrated wastewater and low-temperature flue gas;

[0046] Step C: The concentrated wastewater continuously repeats the treatment of step B until the concentration of the concentrated wastewater meets the preset requirements; the low-temperature flue gas continuously enters the washing tower, and discharges hot water and tail gas after water washing.

[0047] The principle of this method is the same as the above-mentioned treatment system, and the effect achieved is also the same. It has the characteristics of short process, no complex and expensive equipment, ability to recover flue gas heat, and no scaling. It has significant advantages in the field of desulfurization wastewater treatment.

[0048] On this basis, the method can be further optimized as follows.

[0049] Preferably, the method further comprises: monitoring the liquid level in the power wave scrubber to control the liquid level not to exceed the upper limit of the power wave scrubber.

[0050] Preferably, the method further comprises: monitoring the liquid level in the washing tower to control the liquid level not to exceed the upper limit of the washing tower.

[0051] Preferably, the washing tower is a packed washing tower.

[0052] Preferably, the washing tower is a water circulation washing tower.

[0053] The high-temperature flue gas used in the present invention can be from any source in the factory area. The flue gas from different sources has different temperatures, so the process conditions during treatment are somewhat different.

[0054] Preferably, when the temperature of the high-temperature flue gas is 130-200° C., the flow ratio of the high-temperature flue gas to the desulfurization wastewater in the power wave scrubber is 70000-80000:5, preferably 75000-75400:5;

[0055] Preferably, the flow rate of the high temperature flue gas is 70000-80000m 3 / h;

[0056] Preferably, the flow rate of the desulfurization wastewater is 3 to 5 m 3 / h;

[0057] Preferably, the flow rate of the concentrated wastewater recirculation in step B is 2 to 3 m / s. 3 / h, preferably 2.5 to 3m 3 / h.

[0058] Preferably, when the temperature of the high-temperature flue gas is 300-450° C., the flow ratio of the high-temperature flue gas to the desulfurization wastewater in the power wave scrubber is 20000-23000:5, preferably 22000-22460:5;

[0059] Preferably, the flow rate of the high-temperature flue gas is 20000-23000m3 / h;

[0060] Preferably, the flow rate of the desulfurization wastewater is 3 to 5 m 3 / h;

[0061] Preferably, the flow rate of the concentrated wastewater recirculation in step B is 2 to 3 m / s. 3 / h, preferably 2.5 to 3m 3 / h.

[0062] Taking the hot flue gas from a power plant as an example, its temperature is usually 130-200°C. The appropriate process conditions are:

[0063] The flow rate of the desulfurized wastewater is 5m 3 / h, high temperature flue gas flow rate 75390m 3 / h. After passing through the dynamic wave scrubber, the flue gas temperature dropped to 56.2℃ and the flow rate changed to about 77889m 3 / h, the flow rate of the concentrated wastewater reflux cycle in step B is 2.524m 3 / h.

[0064] Taking the flue gas from a hot boiler as an example, the flue gas temperature is generally 300-450°C. At this time, the appropriate process conditions are:

[0065] The flow rate of the desulfurized wastewater is 5m 3 / h, the flue gas temperature is 325℃, and the flow rate of high temperature flue gas is 22460m 3 / h, after passing through the dynamic wave scrubber, the flue gas temperature is 56.2℃, and the flow rate is 24935m 3 / h, the flow rate of the concentrated wastewater reflux cycle in step B is 2.524m 3 / h.

[0066] Preferably, in step B, after the concentrated wastewater is circulated back to contact the high-temperature flue gas, it is also dedusted by a dust collector before re-entering the dynamic wave scrubber for heat and mass transfer with the desulfurization wastewater.

[0067] In summary, compared with the prior art, the present invention achieves the following technical effects.

[0068] (1) During the treatment process, the treatment of desulfurization wastewater is not limited by parameters such as osmotic pressure, boiling point rise and local evaporation intensity. Therefore, the wastewater can be concentrated to a saturated state, achieving the maximum concentration and reduction of wastewater, significantly reducing the subsequent evaporation and crystallization investment and operating costs.

[0069] (2) The present invention recovers the heat of the flue gas discharged from the power plant and uses it to concentrate the desulfurization wastewater, further reducing energy consumption and operating costs.

[0070] (3) The present invention utilizes the principle of "dynamic wave" to achieve heat exchange between flue gas and wastewater. This process is close to an "adiabatic" process and can maximize the use of flue gas heat, which further reduces energy consumption. At the same time, the wastewater in the dynamic wave scrubber is always in a "turbulent" state, so it is not easy to scale and will not corrode the equipment.

[0071] (4) The concentrated wastewater circulated to the flue gas duct usually increases the humidity of the flue gas by about 0.25% and reduces the flue gas temperature by about 4°C. At this time, the flue gas is in an unsaturated state, which is higher than the acid dew point and will not cause corrosion to the flue and electrostatic precipitator. On the contrary, due to the reduction in flue gas temperature, the resistivity of the fly ash in the electrostatic precipitator is reduced, which is beneficial to improving the dust removal efficiency (a dust collector can be set up before the high-temperature flue gas enters the dynamic wave scrubber for dust removal).

[0072] (5) Since the present invention does not require a pretreatment stage and does not have problems such as scaling and corrosion, the system can operate stably for a long time and has significant cost advantages.

[0073] (6) Add a liquid level gauge to detect the liquid level in the equipment to ensure stable and safe operation of the system.

[0074] (7) The concentrated wastewater circulated into the flue will not have a negative impact on the dust removal of the flue gas, that is, it will not affect the normal dust removal and there is no need to modify the relevant dust removal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0076] Figure 1 A schematic diagram of the structure of a desulfurization wastewater treatment system provided in Example 1 of the present invention;

[0077] Reference numerals:

[0078] 1- High temperature flue gas duct, 2- Power wave scrubber, 3- Packing scrubber,

[0079] 4-the first level gauge, 5-the second level gauge, 6-the three-way valve,

[0080] 7- first circulation pump, 8- heat exchanger, 9- second circulation pump. DETAILED DESCRIPTION

[0081] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0082] Example 1

[0083] like Figure 1 As shown, a desulfurization wastewater treatment system includes a high-temperature flue gas pipeline 1, a dynamic wave scrubber 2 and a packed scrubbing tower 3.

[0084] The outlet of the high-temperature flue gas duct 1 is communicated with the gas phase inlet of the power wave scrubber 2 , and the gas phase outlet of the power wave scrubber 2 is communicated with the gas inlet of the packed scrubbing tower 3 .

[0085] The sewage outlet of the power wave scrubber 2 is connected to the high-temperature flue gas pipeline 1 through the first circulation pump 7 and the three-way valve 6 in sequence. The power wave scrubber 2 is also provided with a desulfurization wastewater inlet as a liquid phase inlet.

[0086] The power wave scrubber 2 is connected to a first liquid level meter 4 for detecting the liquid level height in the power wave scrubber 2 .

[0087] Likewise, the packed washing tower 3 is connected to a second liquid level meter 5 for detecting the liquid level height in the packed washing tower 3 .

[0088] The packed washing tower 3 is provided with two condensed water inlets and a washing water outlet, and the condensed water inlet is connected to the washing water outlet via a heat exchanger 8 and a second circulation pump 9 to ensure the recycling of the condensed water.

[0089] The above embodiment can achieve low cost, low energy consumption, high efficiency treatment of desulfurization wastewater, and meet tail gas emission standards and high value recovery of salt. The system working principle of this embodiment is as follows:

[0090] The high-temperature flue gas of the high-temperature flue gas pipeline 1 enters the dynamic wave scrubber 2 through the gas phase inlet of the dynamic wave scrubber 2, and the desulfurized wastewater enters the dynamic wave scrubber 2 at the same time. The two (gas-liquid two-phase) directly contact and collide in countercurrent in the dynamic wave scrubber 2 to carry out efficient heat and mass transfer (close to adiabatic evaporation). At this time, the water in the desulfurized wastewater evaporates into the flue gas, so that the desulfurized wastewater is dehumidified and concentrated, and the high-temperature flue gas is humidified and cooled. At this time, concentrated wastewater and low-temperature flue gas are obtained. The concentrated wastewater circulates to the high-temperature flue gas pipeline 1 through the sewage outlet of the dynamic wave scrubber 2 to contact the flue gas. On the one hand, the flue gas is purified, and on the other hand, it enters the dynamic wave scrubber 2 at the same time as the flue gas to be further concentrated. In this way, the desulfurized wastewater is continuously concentrated until it reaches a predetermined concentration (the conventional salt concentration is required to reach 40-50%). At the same time, the low-temperature flue gas generated enters the washing tower through the gas phase outlet of the dynamic wave scrubber 2 and is discharged after being washed with condensed water.

[0091] In the above process, the flow rate of concentrated wastewater is controlled by the circulation pump, and two liquid level meters respectively control the liquid levels in the dynamic wave scrubber 2 and the packed scrubber 3 to ensure the normal operation of the device.

[0092] This embodiment is only one of the implementations of the present invention. On this basis, other structures may be added or some structures may be replaced to change the technical effects, such as the aspects listed below.

[0093] The level gauge can be replaced with other detection devices or sensors, or manual monitoring of the level can be chosen.

[0094] The structure of the washing tower can be selected in other ways and is not limited to the packed type.

[0095] The sources of the high-temperature flue gas duct 1 are various, such as a power plant or a heating boiler.

[0096] Usually, in order to purify high-temperature flue gas, dust removal is usually performed before the high-temperature flue gas enters the dynamic wave scrubber 2, that is, the outlet of the high-temperature flue gas duct 1 and the gas phase inlet of the dynamic wave scrubber 2 are connected through a dust collector.

[0097] In practical applications, other parts to be developed can be added according to needs.

[0098] When the system of this embodiment uses high-temperature flue gas from different sources, the process conditions for treating desulfurization wastewater will be different, but by optimizing the conditions, the goals of meeting emission standards (even "zero" emissions) and high salt recovery rate, low cost and high efficiency can be achieved.

[0099] Taking the hot flue gas from a power plant as an example, its temperature is usually 130-200°C. The appropriate process conditions are:

[0100] The flow rate of the desulfurized wastewater is 5m3 / h, high temperature flue gas flow rate 75390m 3 / h. After passing through the dynamic wave scrubber, the flue gas temperature dropped to 56.2℃ and the flow rate changed to about 77889m 3 / h, the flow rate of the concentrated wastewater reflux cycle in step B is 2.524m 3 / h.

[0101] Taking the flue gas from a hot boiler as an example, the flue gas temperature is generally 300-450°C. At this time, the appropriate process conditions are:

[0102] The flow rate of the desulfurized wastewater is 5m 3 / h, the flue gas temperature is 325℃, and the flow rate of high temperature flue gas is 22460m 3 / h, after passing through the power wave scrubber, the flue gas temperature dropped to 56.2℃, and the flow rate was 24935m 3 / h, the flow rate of the concentrated wastewater reflux cycle in step B is 2.524m 3 / h.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for treating desulfurization wastewater, characterized in that: The following steps are involved: Step A: high-temperature flue gas and desulfurized wastewater are subjected to heat and mass transfer in a dynamic wave scrubber to concentrate the desulfurized wastewater to obtain concentrated wastewater and low-temperature flue gas; Step B: the concentrated wastewater circulates back to contact the high-temperature flue gas, and simultaneously re-enters the dynamic wave scrubber to transfer heat and mass with the desulfurized wastewater, so as to concentrate the desulfurized wastewater to obtain concentrated wastewater and low-temperature flue gas; When the high temperature flue gas temperature is 130-200°C, the flow rate of the high temperature flue gas is 70000-80000m 3 / h, the flow rate of the concentrated wastewater reflux cycle in step B is 2~3m 3 / h; When the high temperature flue gas temperature is 300-450°C, the flow rate of the high temperature flue gas is 20000-23000m 3 / h, the flow rate of the concentrated wastewater reflux cycle in step B is 2~3m 3 / h; Step C: The concentrated wastewater continuously repeats the treatment of step B until the concentration of the concentrated wastewater meets the preset requirements; the low-temperature flue gas continuously enters the washing tower, and discharges hot water and tail gas after water washing; The desulfurization wastewater treatment system used in the desulfurization wastewater treatment method includes a high-temperature flue gas pipeline, a dynamic wave scrubber and a scrubbing tower; The outlet of the high-temperature flue gas duct is communicated with the gas phase inlet of the power wave scrubber, and the gas phase outlet of the power wave scrubber is communicated with the gas inlet of the scrubbing tower; The sewage outlet of the power wave scrubber is connected to the high-temperature flue gas pipeline through a circulation pump, and the power wave scrubber is also provided with a desulfurization wastewater inlet as a liquid phase inlet.

2. The method for treating desulfurization wastewater according to claim 1, characterized in that: The power wave scrubber is connected to a liquid level meter for monitoring the liquid level in the power wave scrubber to control the liquid level not to exceed the upper limit of the power wave scrubber.

3. The method for treating desulfurization wastewater according to claim 1, characterized in that: The washing tower is connected with a liquid level meter for monitoring the liquid level in the washing tower to control the liquid level not to exceed the maximum limit of the washing tower.

4. The method for treating desulfurization wastewater according to claim 1, characterized in that: The washing tower is a packed washing tower.

5. The method for treating desulfurization wastewater according to claim 1, characterized in that: The washing tower is a water circulation washing tower, and is provided with a condensed water inlet and a washing water outlet. The condensed water inlet and the washing water outlet are connected through a heat exchanger and a circulation pump.

6. The method for treating desulfurization wastewater according to claim 5, characterized in that: The washing tower has multiple condensed water inlets.

7. The method for treating desulfurization wastewater according to claim 5, characterized in that: The heat exchanger is a plate heat exchanger.

8. The method for treating desulfurization wastewater according to claim 1, characterized in that: When the temperature of the high-temperature flue gas is 130-200° C., the flow ratio of the high-temperature flue gas to the desulfurization wastewater in the dynamic wave scrubber is 70,000-80,000:

5.

9. The method for treating desulfurization wastewater according to claim 8, characterized in that: In the dynamic wave scrubber, the flow ratio of the high-temperature flue gas to the desulfurization wastewater is 75000~75400:

5.

10. The method for treating desulfurization wastewater according to claim 8, characterized in that: The flow rate of the desulfurization wastewater is 3~5m 3 / h.

11. The method for treating desulfurization wastewater according to claim 8, characterized in that: The flow rate of the concentrated wastewater reflux cycle in step B is 2.5~3m 3 / h.

12. The method for treating desulfurization wastewater according to claim 1, characterized in that: When the temperature of the high-temperature flue gas is 300-450° C., the flow ratio of the high-temperature flue gas to the desulfurization wastewater in the dynamic wave scrubber is 20000-23000:

5.

13. The method for treating desulfurization wastewater according to claim 12, characterized in that: In the dynamic wave scrubber, the flow ratio of the high-temperature flue gas to the desulfurization wastewater is 22000~22460:

5.

14. The method for treating desulfurization wastewater according to claim 12, characterized in that: The flow rate of the desulfurization wastewater is 3~5m 3 / h.

15. The method for treating desulfurization wastewater according to claim 12, characterized in that: The flow rate of the concentrated wastewater reflux cycle in step B is 2.5~3m 3 / h.

16. The method for treating desulfurization wastewater according to claim 1, characterized in that: In the step B, after the concentrated wastewater is circulated back to contact the high-temperature flue gas, it is also dedusted by a dust collector before re-entering the dynamic wave scrubber to transfer heat and mass with the desulfurization wastewater.

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