A power plant wastewater zero discharge and heat energy recovery cogeneration water purification system

Abstract

The application provides a power plant wastewater zero discharge and heat energy recovery cogeneration water purification system, which comprises a flue gas purification and waste heat recovery unit, a desulfurization wastewater treatment unit, an air regeneration tower and a desalted water preparation unit, the flue gas purification and waste heat recovery unit comprises a flue gas heat exchanger, a desulfurization tower, a solution spraying tower, an atomizing spraying device and a dust collector; the desulfurization wastewater treatment unit comprises a desulfurization wastewater concentration tower, a desulfurization wastewater inlet of the desulfurization wastewater concentration tower is connected with a desulfurization wastewater outlet of the desulfurization tower, and a concentrated desulfurization wastewater outlet of the desulfurization wastewater concentration tower is connected with a nozzle of the atomizing spraying device; the desalted water preparation unit comprises a purification device and a concentrated water concentration tower, and a concentrated liquid outlet of the concentrated water concentration tower is connected with a desulfurization wastewater inlet of the desulfurization wastewater concentration tower; and the air regeneration tower provides circulating air for the concentrated water concentration tower and the desulfurization wastewater concentration tower. The application can realize the functions of wastewater zero discharge, waste heat recovery and improved gypsum quality.

Description

Technical Field

[0001] This invention relates to the field of energy conservation and environmental protection technology, and more specifically, to a power plant wastewater zero-discharge and heat recovery combined water purification system. Background Technology

[0002] Power plants generate large amounts of wastewater and exhaust gases during the power generation process. If these emissions are not properly treated, they can cause serious environmental pollution. Therefore, modern power plants are typically equipped with advanced wastewater and exhaust gas treatment systems to ensure compliance with stringent environmental regulations and minimize their environmental impact.

[0003] Meanwhile, power plant production processes utilize boilers, necessitating the preparation of demineralized water for boiler feedwater. The raw water for demineralized water requires preheating before preparation, and the prepared demineralized water must be heated before being fed into the corresponding deaerator in the boiler. The conventional method is steam preheating, which is energy-intensive.

[0004] The applicant knows that some existing power plant desulfurization wastewater zero discharge systems are basically small-scale and individual wastewater zero discharge systems, which cannot achieve the minimization of heat energy consumption and wastewater discharge from the perspective of overall plant water balance, heat balance, and ion balance. Therefore, this application is hereby submitted. Summary of the Invention

[0005] The purpose of this invention is to provide a power plant wastewater zero-discharge and heat recovery co-production water purification system, which can couple flue gas desulfurization, flue gas waste heat recovery and demineralized water preparation, which is beneficial to taking into account water balance, heat balance and ion balance.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a power plant wastewater zero-discharge and heat recovery co-production water purification system, comprising a flue gas purification and waste heat recovery unit, a demineralized water preparation unit, a desulfurization wastewater treatment unit, and an air regeneration tower.

[0008] The flue gas purification and waste heat recovery unit includes a flue gas heat exchanger, a desulfurization tower and a solution spray tower connected in sequence to the flue gas source. An atomizing spray device and a dust collector are also arranged in sequence between the flue gas source and the flue gas inlet of the desulfurization tower.

[0009] The desulfurization wastewater treatment unit includes a desulfurization wastewater concentration tower, the desulfurization wastewater inlet of the desulfurization wastewater concentration tower is connected to the desulfurization wastewater outlet of the desulfurization tower, and the concentrated desulfurization wastewater outlet of the desulfurization wastewater concentration tower is connected to the nozzle of the atomizing spray device.

[0010] The demineralized water preparation unit includes a purification device and a concentrated water tower connected in sequence to the raw water source. The outlet of the concentrated water tower is connected to the inlet of the desulfurized wastewater in the desulfurized wastewater concentration tower.

[0011] The regenerated air outlet of the air regeneration tower is connected to the circulating air inlet of the desulfurization wastewater concentration tower and the circulating air inlet of the concentrate concentration tower, respectively. The circulating air outlet of the desulfurization wastewater concentration tower and the circulating air outlet of the concentrate concentration tower are both connected to the circulating air inlet of the air regeneration tower.

[0012] In an optional embodiment, the flue gas heat exchanger is connected to a first circulation pipeline, and the desulfurization wastewater concentration tower is provided with a desulfurization wastewater concentration circulation pipeline. The first circulation pipeline is provided with a first heater for heating the liquid in the desulfurization wastewater concentration circulation pipeline.

[0013] In an optional embodiment, a conveying device and a triplet are sequentially connected to the desulfurization wastewater outlet of the desulfurization tower, and the outlet of the triplet is connected to the desulfurization wastewater inlet of the desulfurization wastewater concentration tower.

[0014] And / or, the outlet of the concentrated liquid from the concentrate tower is connected to the inlet of the triplet tank.

[0015] In an optional embodiment, the purification device includes a raw water heater, a low-pressure reverse osmosis device, a high-pressure reverse osmosis device, and a mixed bed desalination device connected in sequence to the raw water source, wherein the concentrate outlet of the high-pressure reverse osmosis device is connected to the concentrate inlet of the concentrate concentration tower.

[0016] In an optional embodiment, a second circulation pipeline is also included. The solution spray tower is connected to a solution spray circulation pipeline, and a waste heat recovery heat exchanger is installed on the solution spray circulation pipeline. Both the waste heat recovery heat exchanger and the raw water heater are installed on the second circulation pipeline.

[0017] In an optional embodiment, a solution regenerator is connected to the solution spray tower, and a solution regeneration circulation pipeline is connected to the solution regenerator. An evaporator and a separation tank are sequentially arranged along the liquid flow direction on the solution regeneration circulation pipeline.

[0018] In an optional embodiment, the concentrate concentration tower is connected to a concentrate concentration circulation pipeline, and a second heater is installed on the concentrate concentration circulation pipeline. The second heater is connected to the steam outlet of the separator.

[0019] In an optional embodiment, a third heater is further provided on the concentrate circulation pipeline, and the second circulation pipeline passes through the third heater.

[0020] In an optional embodiment, the inlet of the mixed bed desalination device is connected to the purified water outlet of the low-pressure reverse osmosis device, the purified water outlet of the high-pressure reverse osmosis device, and the secondary condensate outlet of the second heater, respectively.

[0021] In an optional embodiment, the air regeneration tower is provided with a clean water circulation pipeline, and the clean water circulation pipeline is provided with a demineralized water heater capable of heating the clean water leaving the mixed bed demineralization device.

[0022] And / or, the clean water outlet of the air regeneration tower is connected to the water inlet of the desulfurization tower.

[0023] The beneficial effects of a power plant wastewater zero-discharge and heat recovery co-generation water purification system provided by this invention include:

[0024] This application enables more efficient recovery of heat from flue gas while producing demineralized water and higher-quality gypsum, and simultaneously reduces the consumption of raw water and the generation of solid and liquid waste. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This embodiment provides a flow chart of a power plant wastewater zero-discharge, heat recovery and co-production water purification system.

[0027] Icons: 110-Flue gas heat exchanger; 111-First circulation pipeline; 120-Desulfurization tower; 121-Conveying device; 122-Triple tank; 130-Solution spray tower; 131-Solution spray circulation pipeline; 132-Waste heat recovery heat exchanger; 133-Second circulation pipeline; 134-Solution regenerator; 135-Solution regeneration circulation pipeline; 136-Evaporator; 137-Separation tank; 140-Atomizing spray device; 150-Dust collector; 210-Raw water heater ; 220-Low-pressure reverse osmosis unit; 230-High-pressure reverse osmosis unit; 240-Mixed bed desalination unit; 250-Concentrate tower; 251-Concentrate circulation pipeline; 252-Second heater; 253-Third heater; 310-Desulfurization wastewater concentration tower; 320-Desulfurization wastewater concentration circulation pipeline; 330-First heater; 410-Air regeneration tower; 420-Clean water circulation pipeline; 430-Demineralized water heater; 510-Packaging material; 520-Demister. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0034] This invention provides a power plant wastewater zero-discharge, heat recovery and co-production water purification system, such as... Figure 1 As shown, it includes a flue gas purification and waste heat recovery unit, a demineralized water preparation unit, a desulfurization wastewater treatment unit, and an air regeneration tower 410.

[0035] The flue gas purification and waste heat recovery unit includes a flue gas heat exchanger 110, a desulfurization tower 120 and a solution spray tower 130 connected in sequence to the flue gas source. An atomizing spray device 140 and a dust collector 150 are also arranged in sequence between the flue gas source and the flue gas inlet of the desulfurization tower 120.

[0036] The desulfurization wastewater treatment unit includes a desulfurization wastewater concentration tower 310, the desulfurization wastewater inlet of the desulfurization wastewater concentration tower 310 is connected to the desulfurization wastewater outlet of the desulfurization tower 120, and the concentrated desulfurization wastewater outlet of the desulfurization wastewater concentration tower 310 is connected to the nozzle of the atomizing spray device 140.

[0037] The demineralized water preparation unit includes a purification device and a concentrated water tower 250 connected in sequence to the original water source. The concentrated liquid outlet of the concentrated water tower 250 is connected to the desulfurized wastewater inlet of the desulfurized wastewater concentration tower 310.

[0038] The regenerated air outlet of the air regeneration tower 410 is connected to the circulating air inlet of the desulfurization wastewater concentration tower 310 and the circulating air inlet of the concentrate concentration tower 250, respectively. The circulating air outlet of the desulfurization wastewater concentration tower 310 and the circulating air outlet of the concentrate concentration tower 250 are both connected to the circulating air inlet of the air regeneration tower 410.

[0039] This application provides a power plant wastewater zero-discharge and heat recovery combined water purification system, including a flue gas purification and waste heat recovery unit. The flue gas is divided into two paths. The main path recovers some heat after passing through the flue gas heat exchanger 110, while the branch path passes through the atomizing spray device 140 and the dust collector 150 before entering the desulfurization tower 120 for desulfurization, and then enters the solution spray tower 130 for further heat recovery. Desulfurization wastewater is generated in the desulfurization tower 120. The desulfurization wastewater enters the desulfurization wastewater concentration tower 310 for concentration. The concentrated desulfurization wastewater is transferred to the atomizing spray device 140. After being atomized by the nozzles of the atomizing spray device 140, the water in the wastewater is carried away by the flue gas, and the remaining ash is separated from the flue gas by the dust collector 150, thus achieving zero discharge of desulfurization wastewater.

[0040] In addition, the demineralized water preparation unit generates concentrated water while producing demineralized water. In this application, the concentrated water is concentrated and then transferred to a desulfurization water concentration tower for further concentration treatment along with the desulfurization wastewater. It then enters an atomizing spray device 140 and a dust collector 150 to separate salts and other contaminants, forming ash. The water then enters the desulfurization tower 120 with the flue gas, achieving zero discharge of concentrated water. Compared to the traditional method of directly feeding concentrated water into the desulfurization tower 120, this application uses purified water to feed the desulfurization tower 120, which reduces the chloride ion content in the desulfurization circulating water, thus reducing the amount of desulfurization wastewater and improving the quality of the desulfurization gypsum produced in the desulfurization tower 120. The reduction in desulfurization wastewater is greater than the reduction in concentrated water after further concentration, resulting in a lower overall amount of desulfurization wastewater.

[0041] Meanwhile, the air regeneration tower 410 in this application can provide circulating air and regenerate the circulating air for both the desulfurization wastewater concentration tower 310 and the concentrate concentration tower 250. Compared with the one-to-one arrangement of the desulfurization wastewater concentration tower 310 and the concentrate concentration tower 250 with the air regeneration tower 410, this is beneficial to improve equipment utilization and reduce equipment costs.

[0042] In an optional embodiment, the flue gas heat exchanger 110 is connected to a first circulation pipeline 111, the desulfurization wastewater concentration tower 310 is provided with a desulfurization wastewater concentration circulation pipeline 320, and the first circulation pipeline 111 is provided with a first heater 330 for heating the liquid in the desulfurization wastewater concentration circulation pipeline 320.

[0043] The flue gas heat exchanger 110 transfers heat to the first heater 330 through the first circulation pipeline 111 for heating and concentrating the desulfurization wastewater, thereby achieving heat recovery and utilization. The inlet and outlet of the desulfurization wastewater concentration circulation pipeline are located at the bottom and top of the desulfurization wastewater concentration tower 310, respectively.

[0044] In an optional embodiment, a conveying device 121 and a triplet 122 are sequentially connected to the desulfurization wastewater outlet of the desulfurization tower 120, and the outlet of the triplet 122 is connected to the desulfurization wastewater inlet of the desulfurization wastewater concentration tower 310.

[0045] In this application, the desulfurization wastewater outlet contains not only desulfurization wastewater but also gypsum. First, a conveying device 121, such as a belt conveyor, is used to transfer the slurry from the bottom of the desulfurization tower 120 to separate out the higher quality gypsum. Then, the liquid is transferred to the triple box 122 for further processing before entering the desulfurization wastewater concentration tower 310.

[0046] In an optional embodiment, the outlet of the concentrated liquid from the concentrate tower 250 is connected to the inlet of the triplet 122.

[0047] After the reverse osmosis concentrate is concentrated, it goes to the triplet 122, where it is mixed with the desulfurization wastewater and then concentrated again. The concentrated wastewater is then atomized and sprayed into the flue gas to achieve zero emissions.

[0048] In an optional embodiment, the purification device includes a raw water heater 210, a low-pressure reverse osmosis device 220, a high-pressure reverse osmosis device 230 and a mixed bed desalination device 240 connected in sequence to the raw water source, wherein the concentrate outlet of the high-pressure reverse osmosis device 230 is connected to the concentrate inlet of the concentrate concentration tower 250.

[0049] This application utilizes a combination of reverse osmosis and mixed-bed ion exchange resin to prepare demineralized water, which not only improves water resource utilization but also ensures the quality of boiler feedwater, and is of great significance for improving the operating efficiency and safety of power plants.

[0050] In an optional embodiment, a second circulation pipeline 133 is also included. A solution spraying circulation pipeline 131 is connected to the solution spraying tower 130. A waste heat recovery heat exchanger 132 is provided on the solution spraying circulation pipeline 131. Both the waste heat recovery heat exchanger 132 and the raw water heater 210 are provided on the second circulation pipeline 133.

[0051] In this application, the remaining heat in the flue gas is recovered through the second circulation pipeline 133 to heat the raw water, which helps to improve the heat recovery rate.

[0052] In an optional embodiment, a solution regenerator 134 is connected to the solution spray tower 130, and a solution regeneration circulation pipeline 135 is connected to the solution regenerator 134. An evaporator 136 and a separation tank 137 are sequentially arranged on the solution regeneration circulation pipeline 135 along the liquid flow direction.

[0053] In the solution regeneration circulation pipeline 135, the solution passes through the evaporator 136 and the separation tank 137 successively, evaporating a portion of the water. The liquid rich in residual heat after evaporation can also heat the solution before entering the evaporator 136 to reduce heat loss.

[0054] In an optional embodiment, the concentrate concentration tower 250 is connected to a concentrate concentration circulation pipeline 251, and a second heater 252 is provided on the concentrate concentration circulation pipeline 251. The second heater 252 is connected to the steam outlet of the separator 137.

[0055] The steam exiting from the separator 137 is used to heat the concentrated water in the concentrated water circulation pipeline 251, thereby recovering the heat from the steam.

[0056] In an optional embodiment, a third heater 253 is also provided on the concentrate circulation pipeline 251, and the second circulation pipeline 133 passes through the third heater 253.

[0057] The waste heat recovery heat exchanger 132 can preheat the concentrate in the concentrate circulation pipe through the second circulation pipe 133 and the heater, and the remaining heat can be used to heat the raw water.

[0058] In an optional embodiment, the inlet of the mixed bed desalination device 240 is connected to the purified water outlet of the low-pressure reverse osmosis device 220, the purified water outlet of the high-pressure reverse osmosis device 230, and the secondary condensate outlet of the second heater 252, respectively.

[0059] Since the secondary condensate does not come into direct contact with the flue gas, its water quality is relatively good and can be directly added to the mixed bed desalination unit 240, which can effectively save electricity for the reverse osmosis system.

[0060] In an optional embodiment, the air regeneration tower 410 is provided with a purified water circulation pipeline 420, and the purified water circulation pipeline 420 is provided with a demineralized water heater 430 capable of heating the purified water leaving the mixed bed demineralization device 240.

[0061] And / or, the clean water outlet of the air regeneration tower 410 is connected to the water inlet of the desulfurization tower 120.

[0062] It should be noted that the concentrated water tower 250, air regeneration tower 410, desulfurization tower 120 and solution spray tower 130 in this application are all equipped with packing material 510, and a demister 520 is provided at the top of the packing material 510. The top liquid of the desulfurization wastewater concentrated tower 310 is also equipped with a demister 520. The specific structure can be set by those skilled in the art as needed.

[0063] In summary, this application provides a power plant wastewater zero-discharge and heat recovery co-production water purification system that uses purified water to replenish the desulfurization tower 120, which can reduce the chloride ion content in the desulfurization circulating water, thereby reducing the amount of desulfurization wastewater and improving the quality of the desulfurization gypsum produced in the desulfurization tower 120.

[0064] In this application, more water is separated from the flue gas, which helps to reduce the amount of raw water used and save water resources. The reduction in the amount of raw water introduced also results in fewer ions being separated from the raw water, reducing the production of ash and slag. Compared with the conventional method of using flue gas at 300°C to treat the concentrated water, the atomizing spray device 140 can also use flue gas at a lower temperature, allowing more heat to be recovered from the flue gas.

[0065] The waste heat in the flue gas is utilized three times: through the flue gas heat exchanger 110, the atomizing device, and the solution spraying. The first two times utilize sensible heat, and the latter time utilizes latent heat. If the concentrated water is directly discharged into the desulfurization tower 120, the waste heat of the flue gas after dust removal cannot be largely utilized. For example, if the flue gas temperature after dust removal is generally around 150°C, directly discharging the concentrated water into the desulfurization tower 120 will only reduce the flue gas temperature to a maximum of 110°C. If it is lowered further, the amount of desulfurization wastewater will decrease too much, making it impossible to absorb the reverse osmosis concentrated water. However, in this application, since the reverse osmosis concentrated water does not need to be discharged into the desulfurization tower 120, the temperature of the flue gas after dust removal can be reduced to 90°C, resulting in more thorough recovery of sensible heat.

[0066] In this application, the latent heat recovery of flue gas adopts open heat pump technology, and the secondary condensate water quality is good. Before being directly added to the mixed bed, it can effectively save electricity in the reverse osmosis system.

[0067] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A power plant wastewater zero-discharge, heat recovery and co-production water purification system, characterized in that, It includes a flue gas purification and waste heat recovery unit, a demineralized water preparation unit, a desulfurization wastewater treatment unit, and an air regeneration tower. The flue gas purification and waste heat recovery unit includes a flue gas heat exchanger, a desulfurization tower and a solution spray tower connected in sequence to the flue gas source. An atomizing spray device and a dust collector are also arranged in sequence between the flue gas source and the flue gas inlet of the desulfurization tower. The desulfurization wastewater treatment unit includes a desulfurization wastewater concentration tower, the desulfurization wastewater inlet of the desulfurization wastewater concentration tower is connected to the desulfurization wastewater outlet of the desulfurization tower, and the concentrated desulfurization wastewater outlet of the desulfurization wastewater concentration tower is connected to the nozzle of the atomizing spray device. The demineralized water preparation unit includes a purification device and a concentrated water tower connected in sequence to the raw water source. The outlet of the concentrated water tower is connected to the inlet of the desulfurized wastewater in the desulfurized wastewater concentration tower. The regenerated air outlet of the air regeneration tower is connected to the circulating air inlet of the desulfurization wastewater concentration tower and the circulating air inlet of the concentrate concentration tower, respectively. The circulating air outlet of the desulfurization wastewater concentration tower and the circulating air outlet of the concentrate concentration tower are both connected to the circulating air inlet of the air regeneration tower.

2. The power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 1, characterized in that, The flue gas heat exchanger is connected to a first circulation pipeline, and the desulfurization wastewater concentration tower is equipped with a desulfurization wastewater concentration circulation pipeline. The first circulation pipeline is equipped with a first heater for heating the liquid in the desulfurization wastewater concentration circulation pipeline.

3. The power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 1, characterized in that, The desulfurization tower has a conveying device and a triple box connected in sequence to the desulfurization wastewater outlet. The outlet of the triple box is connected to the desulfurization wastewater inlet of the desulfurization wastewater concentration tower. And / or, the outlet of the concentrated liquid from the concentrate tower is connected to the inlet of the triplet tank.

4. The power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 1, characterized in that, The purification device includes a raw water heater, a low-pressure reverse osmosis device, a high-pressure reverse osmosis device, and a mixed bed desalination device, which are connected in sequence to the raw water source. The concentrate outlet of the high-pressure reverse osmosis device is connected to the concentrate inlet of the concentrate concentration tower.

5. A power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 4, characterized in that, It also includes a second circulation pipeline, on which the solution spray tower is connected. A waste heat recovery heat exchanger is installed on the solution spray circulation pipeline, and both the waste heat recovery heat exchanger and the raw water heater are installed on the second circulation pipeline.

6. The power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 5, characterized in that, The solution spray tower is connected to a solution regenerator, which is connected to a solution regeneration circulation pipeline. An evaporator and a separation tank are sequentially arranged along the liquid flow direction on the solution regeneration circulation pipeline.

7. A power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 6, characterized in that, The concentrate concentration tower is connected to a concentrate concentration circulation pipeline, and a second heater is installed on the concentrate concentration circulation pipeline. The second heater is connected to the steam outlet of the separator.

8. A power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 7, characterized in that, A third heater is also installed on the concentrated water circulation pipeline, and the second circulation pipeline passes through the third heater.

9. A power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 7, characterized in that, The inlet of the mixed bed desalination device is connected to the purified water outlet of the low-pressure reverse osmosis device, the purified water outlet of the high-pressure reverse osmosis device, and the secondary condensate outlet of the second heater, respectively.

10. A power plant wastewater zero-discharge, heat recovery and co-production water purification system according to claim 7, characterized in that, The air regeneration tower is equipped with a clean water circulation pipeline, and the clean water circulation pipeline is equipped with a demineralized water heater that can heat the clean water leaving the mixed bed demineralization device. And / or, the clean water outlet of the air regeneration tower is connected to the water inlet of the desulfurization tower.

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