Anti-scaling desulfurization wastewater evaporation tower

Abstract

The present application discloses an anti-scaling desulfurization wastewater evaporation tower, which relates to the technical field of zero discharge of desulfurization wastewater. The anti-scaling desulfurization wastewater evaporation tower comprises an evaporation tower body, an anti-scaling input device and a wall-attached wind anti-scaling device. The evaporation tower body has an input end and an output end. The wall-attached wind anti-scaling device is arranged on the evaporation tower body. The input end is connected with a first tube body, which is communicated with the evaporation tower body. An atomizing device is arranged at the end of the first tube body. The anti-scaling input device comprises a second tube body and a swirl assembly. A first channel is formed between the swirl assembly and the second tube body. The swirl assembly has a second channel. A flue gas cyclone is arranged in the second channel. The flue gas cyclone is used to change the running trajectory of high-temperature flue gas into a swirl state, and rotate and transport it into the evaporation tower body. The rotating high-temperature flue gas can entrain the atomized desulfurization wastewater. The high-temperature flue gas rotates and flows from the input end to the output end through the swirl assembly.

Description

Technical Field

[0001] The present application relates to the technical field of zero discharge of desulfurization wastewater, and more specifically, to an anti-scaling desulfurization wastewater evaporation tower. Background Art

[0002] Limestone-gypsum wet flue gas desulfurization is the most widely used and most efficient method for thermal power units. Due to the chlorine content in the coal, the chlorine content in the make-up water and the chlorine content in the limestone, the chloride ions in the desulfurization system are continuously concentrated after continuous circulation. When reaching a certain index, it will affect the desulfurization efficiency and increase the consumption of desulfurization limestone. According to the standard, the chloride ions in the desulfurization wastewater should not exceed 20,000 mg / L, so the desulfurization wastewater needs to be treated.

[0003] A large number of studies have shown that independent desulfurization wastewater evaporation towers are a good solution for zero discharge of desulfurization wastewater, but actual application cases of using evaporation towers for zero discharge of desulfurization wastewater all have serious scaling problems, which ultimately make the equipment unusable. In actual tracking of cases where evaporation towers are used for zero discharge of wastewater, the scaling location is mainly on the middle and lower inner walls. When the scaling is serious, the scaling will gradually move upwards, and in severe cases, the space in the tower will be reduced by more than 50%.

[0004] Therefore, there is an urgent need for a non-scaling desulfurization wastewater evaporation tower to achieve zero discharge of desulfurization wastewater. Summary of the invention

[0005] One object of the present application is to provide a new technical solution for an anti-scaling desulfurization wastewater evaporation tower.

[0006] According to one aspect of the present application, an anti-scaling desulfurization wastewater evaporation tower is provided. The anti-scaling desulfurization wastewater evaporation tower includes an evaporation tower body, an anti-scaling input device and a wall-attached wind anti-scaling device, the evaporation tower body has an input end and an output end arranged oppositely, the input end is connected to the anti-scaling input device, the diameter of the anti-scaling input device is smaller than the diameter of the input end, the anti-scaling input device is used to transport high-temperature flue gas to the evaporation tower body, the wall-attached wind anti-scaling device is arranged on the evaporation tower body, the input end is connected to a first tube body, the first tube body is in communication with the evaporation tower body, and the end of the first tube body located in the evaporation tower body is provided with an atomizing device; In the invention, the anti-scaling input device includes a second tube body and a cyclone component, the cyclone component is arranged in the second tube body, a first channel is formed between the cyclone component and the second tube body, the cyclone component has a second channel, a flue gas cyclone is arranged in the second channel, the flue gas cyclone is used to change the running trajectory of the high-temperature flue gas into a cyclone state, and rotate it into the evaporation tower body, the rotating high-temperature flue gas can entrain atomized desulfurization wastewater, the first channel is arranged along the circumferential direction of the second channel, and the high-temperature flue gas rotates and flows from the input end to the output end through the cyclone component.

[0007] Furthermore, the atomizing device is arranged corresponding to the flue gas cyclone, and when the flue gas cyclone and the atomizing device are started, the high-temperature flue gas can entrain the atomized droplets to rotate and flow; wherein, the atomizing device adopts a dual-fluid nozzle, and the droplet size formed after the desulfurization wastewater is atomized is less than 100 microns.

[0008] Furthermore, the anti-scaling input device also includes a bracket, the opposite ends of which are respectively connected to the second tube body and the swirl assembly, a plurality of the brackets are arranged in the first channel, and the plurality of the brackets are arranged along the circumferential direction of the swirl assembly.

[0009] Furthermore, the cyclone assembly includes a fixed plate and the smoke cyclone, the fixed plate and the smoke cyclone are both arranged in the second channel, and a plurality of the smoke cyclones are connected to the fixed plate.

[0010] Furthermore, the flue gas cyclone comprises a cyclone shell and cyclone blades, the cyclone blades are arranged in the cyclone shell, and a plurality of the cyclone blades are arranged along the circumferential direction of the cyclone shell.

[0011] Furthermore, the wall-attached wind anti-scaling device includes an air duct and an anti-scaling component, the anti-scaling component is arranged in the evaporation tower body, the anti-scaling component is provided with an air hole, the end of the air duct passes through the evaporation tower body and is connected with the air hole, the air hole passes through the anti-scaling component along the longitudinal direction of the evaporation tower body, and the air duct is used to transport the anti-scaling flue gas to the anti-scaling component.

[0012] Furthermore, the anti-scaling component has a third channel, the third channel is connected with the first channel and the second channel, and the air holes are arranged along the circumferential direction of the third channel.

[0013] Furthermore, the anti-scaling component has a cavity, the air hole is connected to the cavity, the air hole includes a first injection part and a second injection part, the first injection part and the second injection part are respectively arranged on opposite sides of the anti-scaling component in the axial direction, the second injection part is located between the first injection part and the third channel, and the anti-scaling flue gas forms an air flow layer along the inner wall of the evaporation tower body through the first injection part and the second injection part; wherein, the first injection part includes a plurality of first nozzles, and the plurality of first nozzles are arranged along the circumferential direction of the third channel, the second injection part includes a plurality of second nozzles, and the plurality of second nozzles are arranged along the circumferential direction of the third channel, and the first nozzles are arranged corresponding to the second nozzles.

[0014] Furthermore, a plurality of the anti-scaling components are disposed in the evaporation tower body, the plurality of the anti-scaling components are arranged along the longitudinal direction of the evaporation tower body, and the plurality of the anti-scaling components are respectively connected to the air duct.

[0015] Furthermore, the output end has a slag discharge port and a smoke discharge port, and the slag discharge port and the smoke discharge port are both arranged at the end of the evaporation tower body away from the anti-scaling input device.

[0016] In the embodiment of the present application, the desulfurized wastewater enters the evaporation tower body in an atomized form through the atomizing device, and the high-temperature flue gas is transported to the evaporation tower body through the cyclone component, and the high-temperature flue gas flows through the cyclone component to form a rotating airflow, which can not only concentrate the atomized desulfurized wastewater in the rotating airflow for high-temperature evaporation treatment, but also can entrain the desulfurized wastewater through the rotating high-temperature flue gas, thereby preventing the desulfurized wastewater from dripping and splashing onto the inner wall of the evaporation tower body during the transmission process, thereby achieving the anti-scaling effect on the inner wall of the evaporation tower body, and the cyclone high-temperature flue gas and the atomized desulfurized wastewater can not only be fully mixed through the cyclone rotation, but also the time of the flue gas-water vapor in the evaporation tower body can be prolonged, effectively enhancing the atomized desulfurization The evaporation effect of desulfurized wastewater is improved, and the diameter of the anti-scaling input device is smaller than the diameter of the input end, so that when the high-temperature flue gas enters the evaporation tower body to form a vortex, a gap is formed between the swirling airflow and the inner wall of the evaporation tower body, which effectively prevents the swirling airflow from splashing onto the inner wall of the evaporation tower body during the mixing process of the swirling airflow and the atomized desulfurized wastewater. By arranging the first channel and the wall-attached wind anti-scaling device, part of the high-temperature flue gas forms an airflow protection layer between the inner wall and the central area of ​​the evaporation tower body, which further prevents part of the desulfurized wastewater from splashing onto the inner wall of the evaporation tower body, so as to achieve anti-scaling effect on the evaporation tower body. The anti-scaling input device and the wall-attached wind anti-scaling device are used to implement multiple anti-scaling protections for the evaporation tower body, effectively improving the anti-scaling effect in the evaporation tower body.

[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0019] Figure 1 It is a schematic cross-sectional structure diagram of an anti-scaling desulfurization wastewater evaporation tower in an embodiment of the present application;

[0020] Figure 2 is a top view of the anti-scaling input device in an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the structure of the swirl assembly in the embodiment of the present application;

[0022] Figure 4 is a top view of the anti-scaling member in the embodiment of the present application;

[0023] Description of reference numerals:

[0024] 1- evaporation tower body; 11- input end; 12- output end;

[0025] 2-anti-scaling input device; 21-second tube body; 22-cyclone assembly; 221-second channel; 222-fixing plate; 223-smoke cyclone; 2231-cyclone housing; 2232-cyclone blades; 23-first channel; 24-bracket;

[0026] 3-wall wind anti-scaling device; 31-air duct; 32-anti-scaling member; 321-third channel; 322-first injection part; 3221-first nozzle; 323-second injection part; 3231-second nozzle;

[0027] 4-The first tube body;

[0028] 5- Atomization device;

[0029] 6- slag discharge port;

[0030] 7- Smoke exhaust outlet. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0034] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] According to one embodiment of the present application, an anti-scaling desulfurization wastewater evaporation tower is provided. The anti-scaling desulfurization wastewater evaporation tower includes an evaporation tower body 1, an anti-scaling input device 2 and a wall-attached wind anti-scaling device 3. The evaporation tower body 1 has an input end 11 and an output end 12 arranged opposite to each other. The input end 11 is connected to the anti-scaling input device 2. The diameter of the anti-scaling input device 2 is smaller than the diameter of the input end 11. The anti-scaling input device 2 is used to transport high-temperature flue gas to the evaporation tower body 1. The wall-attached wind anti-scaling device 3 is arranged on the evaporation tower body 1. The input end 11 is connected to a first tube body 4. The first tube body 4 is in communication with the evaporation tower body 1. The end of the first tube body 4 located in the evaporation tower body 1 is provided with an atomizing device 5. The inlet device 2 includes a second tube body 21 and a cyclone component 22, the cyclone component 22 is arranged in the second tube body 21, and a first channel 23 is formed between the cyclone component 22 and the second tube body 21. The cyclone component 22 has a second channel 221, and a flue gas cyclone 223 is arranged in the second channel 221. The flue gas cyclone 223 is used to adapt the movement trajectory of the high-temperature flue gas to a cyclone state, and rotate it to the evaporation tower body 1. The rotating high-temperature flue gas can entrain atomized desulfurization wastewater. The first channel 23 is arranged along the circumferential direction of the second channel 221, and the high-temperature flue gas rotates and flows from the input end 11 to the output end 12 through the cyclone component 22.

[0037] like Figure 1 As shown, the evaporation tower body 1 is a cylindrical structure with a columnar tower body and a conical bottom. For example, the top of the evaporation tower body 1 is horizontally arranged, and the bottom of the evaporation tower body 1 is a 50° to 120° conical head. The diameter size and height size ratio of the evaporation tower body 1 is 0.9:1.3.

[0038] In the embodiment of the present application, the evaporation tower body 1 is a cylindrical structure with a columnar tower body and a conical bottom. The axial direction of the evaporation tower body 1 is the longitudinal direction of the evaporation tower body 1 .

[0039] The top of the evaporation tower body 1 is the input end 11, and the conical bottom is the output end 12. The top of the evaporation tower body 1 is connected to a high-temperature flue gas input pipeline. The anti-scaling input device 2 is arranged in the high-temperature flue gas input pipeline and is close to the input end 11 of the evaporation body. The high-temperature flue gas enters the evaporation tower body 1 in a downward swirling manner through the anti-scaling input device 2.

[0040] The anti-scaling input device 2 includes a second pipe body 21 and a cyclone assembly 22. The second pipe body 21 is a high-temperature flue gas input pipe. One end of the high-temperature flue gas input pipe is connected to the input end 11. The high-temperature flue gas pipe is connected to the evaporation tower body 1.

[0041] The diameter of the anti-scaling input device 2 is smaller than the diameter of the input end 11, that is, the diameter of the second tube body 21 is smaller than the diameter of the evaporation tower body 1. By setting the diameter of the second tube body 21 to be smaller than the diameter of the evaporation tower body 1, when the high-temperature flue gas enters the evaporation tower body 1 to form a vortex, a gap is formed between the vortex airflow and the inner wall of the evaporation tower body 1, which effectively prevents the vortex airflow from splashing onto the inner wall of the evaporation tower body 1 during the mixing process of the vortex airflow and the atomized desulfurization wastewater.

[0042] The diameter of the high-temperature flue gas input pipe is smaller than the diameter of the evaporation tower body 1. The inlet of the high-temperature flue gas input pipe is 200 mm to 500 mm away from the evaporation tower body. For example, if the diameter of the evaporation tower body 1 is 10000 mm, the diameter of the high-temperature flue gas input pipe is less than 1000 mm, and the distance between the inlet edge of the high-temperature flue gas input pipe and the evaporation tower body 1 is preferably 500 mm, which can prevent the droplets of desulfurization wastewater entrained by the high-temperature flue gas from adhering to the inner wall of the evaporation tower body 1 and forming scaling.

[0043] The cyclone assembly 22 is arranged in the high-temperature flue gas pipeline and is close to the input end 11. The wall-mounted wind anti-scaling device 3 is arranged in the evaporation tower body 1 and is located below the cyclone assembly 22. A first tube body 4 is arranged outside the input end 11. The first tube body 4 is arranged along the circumferential direction of the input end 11. The diameter of the high-temperature flue gas input pipeline is smaller than the diameter of the evaporation tower body 1. A supporting portion is formed between the edge of the evaporation tower body 11 and the wall of the high-temperature flue gas input pipe. One end of the first tube body 4 passes through the high-temperature flue gas input pipeline and extends into the input end 11 of the evaporation tower body 1. The supporting portion can support the first tube body 4 to prevent the first tube body 4 from bending due to gravity, pipeline vibration and other factors during the process of conveying desulfurized wastewater, which increases the difficulty of conveying desulfurized wastewater.

[0044] The end of the first tube body 4 located in the evaporation tower body 1 is provided with an atomizing device. That is, multiple first tube bodies 4 are provided at the top of the evaporation tower body 1, and one end of each of the first tube bodies 4 passes through the high-temperature flue gas pipeline and is connected to the evaporation tower body 1. For example, four first tube bodies 4 are provided at the top of the evaporation tower body 1, that is, there are four inlets for desulfurized wastewater. An atomizing device 5 is provided in the evaporation tower body 1 and at the end of the first tube body 4. The desulfurized wastewater is transported to the evaporation tower body 1 through the first tube body 4, and enters the evaporation tower body 1 in an atomized form through the atomizing device 5. The high-temperature flue gas is transported to the evaporation tower body 1 by the downward swirl of the swirl component 22, so that the high-temperature flue gas entrains the atomized desulfurized wastewater. The desulfurized wastewater atomized by the atomizing device 5 is more easily entrained by the downward swirl high-temperature flue gas generated by the swirl component 22. The desulfurized wastewater is transported and evaporated by the downward swirl high-temperature flue gas.

[0045] The swirl assembly 22 is arranged in the second tube body 21, and a first channel 23 is formed between the swirl assembly 22 and the inner wall of the second tube body 21. The distance between the first channel 23 and the inner wall of the evaporation tower body 1 is 200mm-500mm. In other words, the first channel 23 is an annular channel, and the dimension of the annular channel from the first channel 23 to the inner wall of the evaporation tower body 1 is 200mm-500mm. By setting a distance between the first channel 23 and the inner wall of the evaporation tower body 1, it is beneficial to generate a gap between the swirl generated during the operation of the swirl assembly 23 and the inner wall of the evaporation tower body 1, and effectively prevent the droplets of the desulfurization wastewater from splashing onto the inner wall of the evaporation tower body 1 to form scaling during the mixing process of the high-temperature flue gas and the atomized desulfurization wastewater.

[0046] Of course, in the embodiment of the present application, the first channel 23 is not limited to the above structure, and those skilled in the art can configure it according to actual needs.

[0047] In the process of high-temperature flue gas entering the evaporation tower body 1, part of the high-temperature flue gas enters the evaporation tower body 1 through the first channel 23, and this part of the high-temperature flue gas flows from the anti-scaling input device 2 to the wall wind anti-scaling device 3 to form an airflow protection layer on the inner wall of the evaporation tower body 1. Another part of the high-temperature flue gas enters the evaporation tower body 1 through the second channel 221 through the swirl component 22, and this part of the high-temperature flue gas rotates and transports downward, which increases the residence time of the high-temperature flue gas in the evaporation tower body 1, and can also form a swirl of the high-temperature flue gas, so that the high-temperature flue gas can concentrate the atomized desulfurization wastewater at the swirl, effectively preventing the droplets of the atomized desulfurization wastewater from splashing in the evaporation tower body 1. By setting the first channel 23, an airflow protection layer can be formed in the evaporation tower body 1. In the process of the swirl component 22 driving the desulfurization wastewater to be transported downward, part of the desulfurization wastewater is prevented from escaping from the swirl and splashing to the inner wall of the evaporation tower body 1, effectively preventing the internal structure of the evaporation tower body 1 and improving the anti-scaling effect.

[0048] The gas-liquid ratio of high-temperature flue gas and atomized desulfurization wastewater is 12000:1 or above, and the normal flue gas volume is not less than 96000m³ / h.

[0049] The flue gas cyclone 223 is fixedly arranged in the second channel 221. The high-temperature flue gas enters the second tube body 21 through power, and is guided by the flue gas cyclone 223, so that the high-temperature flue gas forms a rotating flow airflow along the guiding direction of the flue gas cyclone 223. Not only is the atomized desulfurized wastewater concentrated in the rotating flow airflow for high-temperature evaporation treatment, but the atomized desulfurized wastewater can also be entrained by the rotating flow of high-temperature flue gas to prevent the atomized desulfurized wastewater from splashing droplets to the inner wall of the evaporation tower body 1 during the transmission process, thereby achieving an anti-scaling effect on the inner wall of the evaporation tower body 1.

[0050] By setting the first channel 23, part of the high-temperature flue gas forms an airflow protection layer in the evaporation tower body 1 to prevent part of the desulfurization wastewater from splashing onto the inner wall of the evaporation tower body 1, so as to achieve a secondary anti-scaling effect on the evaporation tower body 1. The anti-scaling input device 2 and the wall-mounted wind anti-scaling device 3 are used to achieve double anti-scaling protection for the evaporation tower body 1, thereby effectively improving the anti-scaling effect in the evaporation tower body 1.

[0051] In the embodiment of the present application, the desulfurized wastewater enters the evaporation tower body in an atomized form through the atomizing device, and the high-temperature flue gas is transported to the evaporation tower body through the cyclone component, and the high-temperature flue gas flows through the cyclone component to form a rotating airflow, which can not only concentrate the atomized desulfurized wastewater in the rotating airflow for high-temperature evaporation treatment, but also can entrain the desulfurized wastewater through the rotating high-temperature flue gas, thereby preventing the desulfurized wastewater from dripping and splashing onto the inner wall of the evaporation tower body during the transmission process, thereby achieving the anti-scaling effect on the inner wall of the evaporation tower body, and the cyclone high-temperature flue gas and the atomized desulfurized wastewater can not only be fully mixed through the cyclone rotation, but also the time of the flue gas-water vapor in the evaporation tower body can be prolonged, effectively enhancing the atomized desulfurization The evaporation effect of desulfurized wastewater is improved, and the diameter of the anti-scaling input device is smaller than the diameter of the input end, so that when the high-temperature flue gas enters the evaporation tower body to form a vortex, a gap is formed between the swirling airflow and the inner wall of the evaporation tower body, which effectively prevents the swirling airflow from splashing onto the inner wall of the evaporation tower body during the mixing process of the swirling airflow and the atomized desulfurized wastewater. By arranging the first channel and the wall-attached wind anti-scaling device, part of the high-temperature flue gas forms an airflow protection layer between the inner wall and the central area of ​​the evaporation tower body, which further prevents part of the desulfurized wastewater from splashing onto the inner wall of the evaporation tower body, so as to achieve anti-scaling effect on the evaporation tower body. The anti-scaling input device and the wall-attached wind anti-scaling device are used to implement multiple anti-scaling protections for the evaporation tower body, effectively improving the anti-scaling effect in the evaporation tower body.

[0052] In one example, the atomizing device 5 is arranged corresponding to the flue gas cyclone 223. When the flue gas cyclone 223 and the atomizing device 5 are started, the high-temperature flue gas can entrain the atomized droplets to rotate and flow; wherein, the atomizing device 5 adopts a dual-fluid nozzle, and the droplet size formed after the desulfurization wastewater is atomized is less than 100 microns.

[0053] like Figure 1 As shown, one end of the first tube body 4 passes through the second tube body 21 and extends into the evaporation tower body 1, and an atomizing device 5 is arranged at the end of the first tube body 4 to atomize and spray the desulfurization wastewater transported near the evaporation tower body 1 through the first tube body 4 into the evaporation tower body 1.

[0054] Four first tube bodies 4 are arranged at the input end 11 of the evaporation tower body 1 to form four desulfurization wastewater inlets. Atomization devices 5 are arranged at the ends of the four first tube bodies 4 .

[0055] The atomizing device 5 adopts a dual-fluid nozzle, through which the spraying form and droplet size of the desulfurized wastewater can be adjusted. The droplet size of the desulfurized wastewater sprayed by the dual-fluid nozzle is less than 100 microns.

[0056] The atomizing device 5 is fixed at the top of the tower, extending into the tower, and is located below the central area of ​​the anti-scaling input device 2, and is lower than the plane of the top of the tower. Fixing the atomizing device 5 at the input end 11 of the evaporation tower body 1 can avoid vibration of the atomizing device 5, improve the atomization effect of the desulfurization wastewater, and facilitate the disassembly of the atomizing device 5, which is conducive to blockage cleaning or online replacement. The atomizing device 5 adopts a dual-fluid nozzle, and the droplets are 50 microns-100 microns. The atomizing device 5 is located in the central area of ​​the high-temperature flue gas transmitted by the cyclone component 22. The high-temperature flue gas wraps the atomization range when rotating and flowing, preventing the undried droplets from sticking to the inner wall of the evaporation tower and forming scaling.

[0057] A regulating valve is provided on the first pipe body 4. The flow rate, shape and droplet size of the desulfurization wastewater entering the evaporation tower body 1 are adjusted by setting the regulating valve, which can not only prevent the evaporation effect from being poor due to excessive flow rate and cause scaling inside the evaporation tower body 1, but also prevent the waste of resources caused by excessive anti-scaling flue gas in the evaporation tower body 1 due to too small flow rate.

[0058] In one example, the anti-scaling input device 2 also includes a bracket 24, the opposite ends of which are respectively connected to the second tube body 21 and the swirl assembly 22, and a plurality of the brackets 24 are arranged in the first channel 23, and the plurality of the brackets 24 are arranged along the circumferential direction of the swirl assembly 22.

[0059] like Figure 1 and Figure 2 As shown, the anti-scaling input device 2 includes a second pipe body 21, a bracket 24 and a cyclone assembly 22. A first channel 23 is formed between the second pipe body 21 and the cyclone assembly 22. The bracket 24 is disposed in the first channel 23, and opposite ends of the bracket 24 are connected to the inner wall of the second pipe body 21 and the outer wall of the cyclone assembly 22, respectively.

[0060] The bracket 24 can be connected to the second tube body 21 and the swirl component 22 by bonding, welding or integral molding.

[0061] At least two groups of brackets 24 are arranged in the first channel 23. For example, Figure 2 As shown, four groups of brackets 24 are arranged in the first channel 23, and each group has two brackets 24. The four groups of brackets 24 are evenly distributed in the first channel 23, and the swirl assembly 22 is fixed in the second tube body 21 through the brackets 24.

[0062] The cyclone assembly 22 is fixed in the second tube body 21 by the bracket 24, so that when the high-temperature flue gas is transported through the cyclone assembly 22, part of the flue gas passes through the first channel 23 to form an airflow protection layer in the evaporation tower body 1, thereby realizing anti-scaling protection for the evaporation tower body 1.

[0063] In one example, the cyclone assembly 22 includes a fixed plate 222 and the smoke cyclone 223 , the fixed plate 222 and the smoke cyclone 223 are both arranged in the second channel 221 , and a plurality of the smoke cyclones 223 are connected to the fixed plate 222 .

[0064] like Figures 1 to 3 As shown, the swirl assembly 22 includes a fixing plate 222. The fixing plate 222 is disposed in the second channel 221, and the fixing plate 222 divides the second channel 221 into a plurality of swirl channels along the axial direction, so that the high-temperature flue gas is transported to the evaporation tower body 1 through the plurality of swirl channels.

[0065] Each cyclone channel is provided with a smoke cyclone 223. The outer wall of the smoke cyclone 223 is connected to the fixing plate 222. The smoke cyclone 223 can be connected by bonding, welding or integral molding.

[0066] In one example, the flue gas cyclone 223 includes a cyclone shell 2231 and cyclone blades 2232 , wherein the cyclone blades 2232 are disposed in the cyclone shell 2231 , and a plurality of the cyclone blades 2232 are arranged along the circumferential direction of the cyclone shell 2231 .

[0067] like Figure 2 and Figure 3 As shown, the flue gas cyclone 223 includes a cyclone housing 2231 and a cyclone blade 2232. The cyclone housing 2231 is in the shape of a hollow column, and the top and bottom of the cyclone housing 2231 are both open. The outer wall of the cyclone housing 2231 is connected to the fixing plate 222, and the cyclone housing 2231 is fixed in the cyclone channel, so that when the high-temperature flue gas passes through the cyclone channel, the running trajectory of the high-temperature flue gas transported downward is changed by the flue gas cyclone 223.

[0068] A plurality of cyclone blades 2232 are provided in the cyclone housing 2231. For example, four cyclone blades 2232 are provided in the cyclone housing 2231. One end of the cyclone blade 2232 is connected to the inner wall of the cyclone housing 2231, and the four cyclone blades 2232 are evenly provided in the cyclone housing 2231. The cyclone blade 2232 has a bent portion at one end away from the cyclone housing 2231. The cyclone strength of the high-temperature flue gas can be effectively enhanced by providing the bent portion.

[0069] In one example, the wall-attached wind anti-scaling device 3 includes an air duct 31 and an anti-scaling component 32. The anti-scaling component 32 is arranged in the evaporation tower body 1. The anti-scaling component 32 is provided with an air hole. The end of the air duct 31 passes through the evaporation tower body 1 and is connected with the air hole. The air hole passes through the anti-scaling component 32 along the longitudinal direction of the evaporation tower body 1. The air duct 31 is used to transport the anti-scaling flue gas to the anti-scaling component 32.

[0070] like Figure 1 and Figure 4 As shown, the wall-attached wind anti-scaling device 3 includes an air duct 31 and an anti-scaling member 32. The air duct 31 is an anti-scaling flue gas conveying air duct 31. The anti-scaling member 32 is arranged in the evaporation tower body 1, and one end of the air duct 31 passes through the side wall of the evaporation tower body 1 and is connected to the anti-scaling member 32, so that the anti-scaling flue gas is conveyed to the anti-scaling member 32 through the air duct 31, and the anti-scaling flue gas is sprayed into the evaporation tower body 1 through the anti-scaling member 32, so as to realize the anti-scaling protection of the evaporation tower body 1.

[0071] The anti-scaling member 32 is annular and cylindrical, and is a hollow structure. The air holes penetrate the anti-scaling member 32 in the direction from the input end to the output end. In other words, the air holes are arranged along the longitudinal direction of the anti-scaling member 32.

[0072] The air duct 31 is connected to the anti-scaling member 32, that is, the air duct 31 is connected to the air hole. The anti-scaling flue gas enters the anti-scaling member 32 through the air duct 31, and the anti-scaling flue gas is sprayed out through the air hole. That is to say, the anti-scaling flue gas enters the anti-scaling member 32 and is sprayed along the inner wall of the evaporation tower body 1 through the air hole. The air hole penetrates the anti-scaling member 32 in the longitudinal direction, so that the anti-scaling flue gas is sprayed along the longitudinal direction of the evaporation tower body 1, forming an airflow protection layer on the inner wall of the evaporation tower body 1, and preventing the desulfurization wastewater from scaling on the inner wall of the evaporation tower body 1.

[0073] In one example, the anti-fouling member 32 has a third channel 321 , the third channel 321 is in communication with the first channel 23 and the second channel 221 , and the air holes are arranged along the circumferential direction of the third channel 321 .

[0074] like Figure 1 and Figure 4As shown, the anti-scaling member 32 is annular and cylindrical, and the anti-scaling member is a hollow structure. The outer wall of the anti-scaling member 32 is connected to the inner wall of the evaporation tower body 1, that is, the axial direction of the inner circle of the anti-scaling member 32 is consistent with the axial direction of the evaporation tower body 1, and the third channel 321 of the anti-scaling member 32 is connected with the first channel 23 and the second channel 221. By connecting the third channel 321 with the first channel 23 and the second channel 221, the high-temperature flue gas with desulfurized wastewater transmitted by the cyclone assembly 22 passes through the third channel 321 and is discharged from the evaporation tower body 1.

[0075] The air holes are arranged along the circumferential direction of the third channel 321 so that the anti-scaling flue gas can flow along the inner wall of the evaporation tower body 1 through the air holes, which is conducive to the anti-scaling flue gas forming an airflow protection layer in the evaporation tower body 1 to prevent scaling of the inner wall of the evaporation tower body 1.

[0076] In one example, the anti-scaling member 32 has a cavity, the air hole is connected to the cavity, the air hole includes a first injection part 322 and a second injection part 323, the first injection part 322 and the second injection part 323 are respectively arranged on opposite sides of the anti-scaling member 32 in the axial direction, the second injection part 323 is arranged between the first injection part 322 and the third channel 321, and the anti-scaling flue gas forms an air flow layer along the inner wall of the evaporation tower body 1 through the first injection part 322 and the second injection part 323. The first injection part 322 includes a plurality of first nozzles 3221, and the plurality of first nozzles 3221 are arranged along the circumferential direction of the third channel 321, and the second injection part 323 includes a plurality of second nozzles 3231, and the plurality of second nozzles 3231 are arranged along the circumferential direction of the third channel 321, and the first nozzles 3221 and the second nozzles 3231 are arranged correspondingly.

[0077] like Figure 1 and Figure 4 As shown, the anti-scaling member 32 is annular, and a cavity is provided inside the annular anti-scaling member 32. The air duct 31 is connected to the cavity. The first injection part 322 and the second injection part 323 are respectively provided on opposite sides of the anti-scaling member 32. That is, the first injection part 322 is provided at the top of the anti-scaling member 32, and the second injection part 323 is provided at the bottom. Anti-scaling flue gas is input into the cavity through the air duct 31, and the anti-scaling flue gas is sprayed upward along the inner wall of the evaporation tower body 1 through the first injection part 322, and sprayed downward along the inner wall of the evaporation tower body 1 through the second injection part 323. An anti-scaling flue gas airflow layer is formed on the inner wall of the evaporation tower body 1 through the first injection part 322 and the second injection part 323, so as to prevent the high-temperature flue gas and the atomized desulfurization wastewater from splashing to the inner wall of the evaporation tower body 1 during the downward rotation, and the inner wall of the evaporation tower body 1 is protected by the anti-scaling flue gas airflow layer.

[0078] The air hole includes a first injection portion 322 and a second injection portion 323. The first injection portion 322 and the second injection portion 323 both penetrate the anti-scaling member 32 in the longitudinal direction. That is, the first injection portion 322 and the second injection portion 323 are opened in the anti-scaling member 32 along the direction from the input end 11 to the output end 12.

[0079] The first injection portion 322 and the second injection portion 323 are both arranged in an annular shape on the anti-scaling member 32, and the diameter of the first injection portion 322 is greater than the diameter of the second injection portion 323. In other words, the first injection portion 322 is close to the outer wall of the anti-scaling member 32, and the second injection portion 323 is close to the third channel 321 of the anti-scaling member 32.

[0080] like Figure 1 and Figure 4 As shown, the first injection part 322 and the second injection part 323 are both annular, wherein the second injection part 323 is located between the third channel 321 and the first injection part 322. By providing a double-layer injection part to form a double-layer airflow protection for the evaporation tower body 1, the double-layer anti-scaling protection for the inner wall of the evaporation tower body 1 is enhanced.

[0081] The anti-scaling member 32 is a hollow annular structure. The upper surface and the lower surface of the anti-scaling member 32 are both provided with a first injection portion 322 and a second injection portion 323 .

[0082] The first injection part 322 includes an upper injection part and a lower injection part, which are respectively arranged on opposite sides of the hollow annular anti-fouling member in the axial direction. The upper injection part and the lower injection part are in communication.

[0083] The second injection part 323 includes an upper injection part and a lower injection part, which are respectively arranged on opposite sides of the hollow annular anti-fouling member in the axial direction. The upper injection part and the lower injection part are in communication.

[0084] That is, the upper layer injection part and the lower layer injection part are arranged on the hollow annular anti-scaling part along the longitudinal direction of the evaporation tower body 1. The upper layer injection part is arranged at the upper part of the hollow annular anti-scaling part, and the lower layer injection part is arranged at the lower part of the hollow annular anti-scaling part. The upper layer injection part and the lower layer injection part are connected, so that the anti-scaling flue gas passes through the upper layer injection part from the hollow annular anti-scaling part to the top of the evaporation tower body 1 to form an airflow protection layer, and passes through the lower layer injection part from the hollow annular anti-scaling part to the bottom of the evaporation tower body 1 to form an airflow protection layer, so as to form airflow protection for the evaporation tower body 1 and enhance the double-layer anti-scaling protection for the inner wall of the evaporation tower body 1.

[0085] As shown in the top view of the anti-fouling member, the first injection portion 322 includes a plurality of arc-shaped first nozzles 3221. The second injection portion 323 includes a plurality of arc-shaped second nozzles 3231. The sizes of the first and second nozzles are both 50 mm × 5 mm arc-shaped nozzles. The spacing between two adjacent first nozzles 3221 is 40 mm. The spacing between two adjacent second nozzles 3231 is 40 mm. The spacing between the adjacent first nozzles 3221 and the second nozzles 3231 is 10 mm.

[0086] Of course, in the embodiment of the present application, the anti-scaling member is not limited to the above structure, and those skilled in the art can set it according to actual needs. For example, the anti-scaling member 32 is provided with a spraying portion, which is a nozzle of a plurality of columnar through holes, and the plurality of columnar through holes are arranged along the circumferential direction of the third channel 321.

[0087] In one example, a plurality of the anti-scaling components 32 are disposed in the evaporation tower body 1 , the plurality of the anti-scaling components 32 are arranged along the longitudinal direction of the evaporation tower body 1 , and the plurality of the anti-scaling components 32 are respectively connected to the air duct 31 .

[0088] like Figure 1 As shown, two anti-scaling components 32 are arranged in the evaporation tower body 1. The two anti-scaling components 32 are arranged up and down in the evaporation tower body 1. That is, the two anti-scaling components 32 are arranged in the direction from the input end 11 to the output end 12 or from the output end 12 to the input end 11.

[0089] The air duct 31 is communicated with two anti-scaling parts respectively. By providing a plurality of anti-scaling parts to enhance the pressure of the anti-scaling flue gas in the evaporation tower body 1 , the anti-scaling protection in the evaporation tower body 1 is effectively improved.

[0090] A regulating valve is provided on the air duct 31. When the air duct 31 is connected to a plurality of anti-scaling parts 32 respectively, the air duct 31 pipe bodies connected to the corresponding anti-scaling parts 32 are all provided with regulating valves. By providing a regulating valve to adjust the pressure of the anti-scaling flue gas flowing through the corresponding anti-scaling parts 32, the regulating valve can not only prevent the anti-scaling flue gas pressure transported to the evaporation tower body 1 from being too high to cause waste of resources, but also prevent the anti-scaling flue gas pressure from being too low to cause poor protection effect.

[0091] The regulating valve on the air duct 31 can adjust the injection height and intensity of the anti-scaling flue gas to ensure that the inner wall of the evaporation tower body 1 has anti-scaling flue gas with higher temperature and flow rate, protect the inner wall of the evaporation tower body 1, and ensure that the droplets of desulfurization wastewater do not stick to the inner wall of the evaporation tower body 1.

[0092] The anti-scaling flue gas transported through the air duct 31 is the flue gas after the dust collector, and the flue gas does not contain dust, thereby preventing the flue gas from wearing the evaporation tower body 1. By adjusting the anti-scaling flue gas pressure, it is ensured that the desulfurization wastewater entrained by the high-temperature flue gas cannot reach the inner wall of the evaporation tower body 1.

[0093] In one example, the output end 12 has a slag discharge port 6 and a flue gas discharge port 7 , and the slag discharge port 6 and the flue gas discharge port 7 are both arranged at the end of the evaporation tower body 1 away from the anti-scaling input device 2 .

[0094] like Figure 1 As shown, the bottom of the evaporation tower body 1 is conical. The slag discharge port 6 is arranged at the bottom of the evaporation tower body 1. By setting the bottom of the evaporation tower body 1 to be conical, it is beneficial to the deposition of ash and slag in the evaporation tower body 1 and to facilitate the discharge of ash and slag in the evaporation tower body 1.

[0095] The slag discharge port 6 is provided with an electric gate valve, which is provided to automatically discharge the evaporated ash, thereby reducing manual labor intensity and improving work efficiency.

[0096] The flue gas outlet 7 is a low-temperature flue gas outlet 7, which is used to discharge the flue gas in the evaporation tower body 1 and the waste gas generated by evaporating the desulfurized wastewater. The flue gas outlet 7 is provided with a temperature measuring device for measuring the temperature of the low-temperature flue gas, so as to adjust the ratio of the high-temperature flue gas and the desulfurized wastewater to ensure that the whole set of equipment works normally. The temperature of the low-temperature flue gas needs to be greater than the acid dew point of the flue gas after mixing, so as to prevent the waste gas and waste liquid remaining in the evaporation tower body 1 from corroding the inside of the evaporation tower body 1 when the temperature of the low-temperature flue gas is lower than the acid dew point of the flue gas after mixing.

[0097] The flue gas outlet 7 is located at the middle and upper part of the conical part at the bottom of the evaporation tower body 1. By arranging the flue gas outlet 7 at a position higher than the slag outlet 6, it is not only conducive to the discharge of low-temperature flue gas, but also prevents ash from blocking the flue gas outlet 7 during the deposition process.

[0098] In one example, the anti-scaling desulfurization wastewater evaporation tower further includes a manhole and an observation port, and the manhole and the observation port are both arranged on the evaporation tower body 1 .

[0099] like Figure 1 As shown, a manhole is opened in the evaporation tower for maintenance.

[0100] Preferably, a manhole may be provided between two sets of wall-attached wind anti-scaling devices 3 of the evaporation tower body 1, so as to facilitate the inspection and repair of the wall-attached wind anti-scaling devices 3 through the manhole.

[0101] The observation port is located at the top of the evaporation tower body 1. The observation port is located 200mm below the top of the side wall of the evaporation tower body 1. The observation port is made of high-temperature resistant glass in a window mode, which is used to observe the internal desulfurization wastewater atomization and the scaling of the inner wall of the evaporation tower body 1, which is convenient for adjusting the high-temperature flue gas flow, anti-scaling flue gas flow, desulfurization wastewater flow, and timely cleaning of scaling.

[0102] Of course, in the embodiment of the present application, the observation port and the manhole are not limited to the above structure, and those skilled in the art can set them according to actual needs. Example

[0103] A thermal power plant originally had 2×330MW water-cooled pure condensing units, with a daily coal content of about 1%. The wastewater discharge was adjusted according to the standard chloride ion concentration in the desulfurization wastewater. After testing, the chloride ion content in the desulfurization wastewater was about 20,000 mg / m³, and 192t / d (8t / h) of desulfurization wastewater needed to be treated daily. The high-temperature flue gas evaporation method was used to treat the desulfurization wastewater.

[0104] An anti-scaling desulfurization wastewater evaporation tower is used to treat desulfurization wastewater. The diameter of the evaporation tower body 1 is 10.5m, the height of the evaporation tower body 1 is 13 meters, and the lower conical part is 3m high. The high-temperature flue gas is connected to the flue gas after the economizer. The flue gas temperature range is 350℃-420℃. The flue gas volume is 12000 gas-water ratio. The high-temperature flue gas volume and the gas-liquid ratio of the desulfurization wastewater to be evaporated are 12000:1 and above, and the normal flue gas volume is not less than 96000m³ / h. The anti-scaling flue gas is connected to the clean flue gas after the induced draft fan, and the temperature is about 130℃.

[0105] After being treated by the triple box, the desulfurized wastewater is sprayed into the evaporation tower body 1 through the first pipe body 4 and the atomizing device 5. The high-temperature flue gas flows into the evaporation tower body 1 through the cyclone component 22. According to the structural characteristics of the cyclone component 22, the middle part of the high-temperature flue gas passes through the cyclone component 22 and the annular first channel 23, and is mixed with the atomized desulfurized wastewater at the atomizing device 5. The mixed flue gas and desulfurized wastewater are heat exchanged in the evaporation tower body 1. After the water in the wastewater evaporates, it is discharged from the flue gas outlet 7 together with the low-temperature flue gas. The salt crystals in the wastewater and the ash in the flue gas are mixed and fall into the slag outlet 6 for external transportation.

[0106] During operation, the atomization condition can be observed through the observation port to ensure the normal operation of the atomization device 5. The scaling condition of the inner wall of the evaporation tower body 1 can be observed through the observation port, and the strength of the anti-scaling flue gas can be adjusted by the wall wind anti-scaling device 3 to ensure that the inner wall of the evaporation tower body 1 is not scaled.

[0107] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An anti-scaling desulfurization wastewater evaporation tower, characterized in that: The invention comprises an evaporation tower body (1), an anti-scaling input device (2) and a wall-attached wind anti-scaling device (3), wherein the evaporation tower body (1) has an input end (11) and an output end (12) arranged opposite to each other, wherein the input end (11) is connected to the anti-scaling input device (2), the diameter of the anti-scaling input device (2) is smaller than the diameter of the input end (11), the anti-scaling input device (2) is used to transport high-temperature flue gas to the evaporation tower body (1), the wall-attached wind anti-scaling device (3) is arranged on the evaporation tower body (1), the input end (11) is connected to a first tube (4), the first tube (4) is in communication with the evaporation tower body (1), and an atomizing device (5) is arranged at the end of the first tube (4) located inside the evaporation tower body (1); The anti-scaling input device (2) comprises a second tube body (21) and a cyclone component (22); the cyclone component (22) is arranged in the second tube body (21); a first channel (23) is formed between the cyclone component (22) and the second tube body (21); the cyclone component (22) has a second channel (221); a flue gas cyclone (223) is arranged in the second channel (221); the flue gas cyclone (223) is used to change the running trajectory of the high-temperature flue gas into a cyclone state, and convey it to the evaporation tower body (1) in a rotatable manner; the high-temperature flue gas in a rotatable flow can entrain atomized desulfurized wastewater; the first channel (23) is arranged along the circumferential direction of the second channel (221); the high-temperature flue gas flows in a rotatable manner from the input end (11) to the output end (12) through the cyclone component (22).

2. The anti-scaling desulfurization wastewater evaporation tower according to claim 1, characterized in that: The atomizing device (5) is arranged corresponding to the smoke cyclone (223), and when the smoke cyclone (223) and the atomizing device (5) are started, the high-temperature smoke can entrain the atomized liquid droplets to rotate and flow; Wherein, the atomizing device (5) adopts a dual-fluid nozzle, and the droplet size formed after the desulfurization wastewater is atomized is less than 100 microns.

3. The anti-scaling desulfurization wastewater evaporation tower according to claim 1, characterized in that: The anti-scaling input device (2) further comprises a bracket (24), the opposite ends of the bracket (24) being respectively connected to the second tube body (21) and the swirl assembly (22), a plurality of the brackets (24) being arranged in the first channel (23), and the plurality of the brackets (24) being arranged along the circumferential direction of the swirl assembly (22).

4. The anti-scaling desulfurization wastewater evaporation tower according to claim 1, characterized in that: The cyclone assembly (22) comprises a fixed plate (222) and the smoke cyclone (223); the fixed plate (222) and the smoke cyclone (223) are both arranged in the second channel (221); and a plurality of the smoke cyclones (223) are connected to the fixed plate (222).

5. The anti-scaling desulfurization wastewater evaporation tower according to claim 4, characterized in that: The flue gas cyclone (223) comprises a cyclone shell (2231) and cyclone blades (2232); the cyclone blades (2232) are arranged in the cyclone shell (2231); and a plurality of the cyclone blades (2232) are arranged along the circumferential direction of the cyclone shell (2231).

6. The anti-scaling desulfurization wastewater evaporation tower according to claim 1, characterized in that: The wall-attached wind anti-scaling device (3) comprises an air duct (31) and an anti-scaling component (32); the anti-scaling component (32) is arranged in the evaporation tower body (1); an air hole is provided on the anti-scaling component (32); an end of the air duct (31) passes through the evaporation tower body (1) and is connected to the air hole; the air hole passes through the anti-scaling component (32) along the longitudinal direction of the evaporation tower body (1); and the air duct (31) is used to transport the anti-scaling flue gas to the anti-scaling component (32).

7. The anti-scaling desulfurization wastewater evaporation tower according to claim 6, characterized in that: The anti-fouling member (32) has a third channel (321), the third channel (321) is in communication with the first channel (23) and the second channel (221), and the air holes are arranged along the circumferential direction of the third channel (321).

8. The anti-scaling desulfurization wastewater evaporation tower according to claim 7, characterized in that: The anti-scaling member (32) has a cavity, the air hole is connected to the cavity, the air hole comprises a first injection portion (322) and a second injection portion (323), the first injection portion (322) and the second injection portion (323) are respectively arranged on two opposite sides of the anti-scaling member (32) in the axial direction, the second injection portion (323) is located between the first injection portion (322) and the third channel (321), and the anti-scaling flue gas passes through the first injection portion (322) and the second injection portion (323) to form an airflow layer along the inner wall of the evaporation tower body (1); Wherein, the first injection portion (322) includes a plurality of first nozzles (3221), and the plurality of first nozzles (3221) are arranged along the circumferential direction of the third channel (321); the second injection portion (323) includes a plurality of second nozzles (3231), and the plurality of second nozzles (3231) are arranged along the circumferential direction of the third channel (321), and the first nozzles (3221) and the second nozzles (3231) are arranged correspondingly.

9. The anti-scaling desulfurization wastewater evaporation tower according to claim 6, characterized in that: A plurality of anti-scaling components (32) are arranged in the evaporation tower body (1); the plurality of anti-scaling components (32) are arranged along the longitudinal direction of the evaporation tower body (1); and the plurality of anti-scaling components (32) are respectively connected to the air duct (31).

10. The anti-scaling desulfurization wastewater evaporation tower according to claim 1, characterized in that: The output end (12) has a slag discharge port (6) and a flue gas discharge port (7), and the slag discharge port (6) and the flue gas discharge port (7) are both arranged at an end of the evaporation tower body (1) away from the anti-scaling input device (2).

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