Flue gas desulfurization wastewater treatment equipment for coal-fired boiler

Abstract

The invention relates to the technical field of wastewater treatment equipment, and discloses coal-fired boiler flue gas desulfurization wastewater treatment equipment which comprises an evaporation tower, a steam frame is arranged on the evaporation tower, a steam conveying pipe is installed on the evaporation tower, the steam conveying pipe communicates with the steam frame, and external steam enters the steam conveying pipe through the steam frame; in the use process, the steam conveying pipe is arranged to be in a spiral shape, the contact area between the steam and the waste water is increased, the contact time between the steam and the waste water is prolonged, the heat exchange effect between the steam and the waste water is improved, and the waste water can be evaporated and concentrated. Meanwhile, water vapor is adopted as power to drive the cleaning frame to reciprocate, the outer wall of the steam conveying pipeline is cleaned through the cleaning frame, and therefore a scale layer is prevented from being formed on the outer wall of the steam conveying pipeline.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, specifically to a wastewater treatment device for flue gas desulfurization from a coal-fired boiler. Background Technology

[0002] Currently, coal-fired power generation remains the primary method of power generation. During the combustion process, coal-fired power plants produce flue gas containing a large amount of sulfur dioxide, causing air pollution. To avoid this pollution, desulfurization is required to remove sulfur from the flue gas. Currently, wet limestone-gypsum desulfurization is widely used for flue gas desulfurization. Although this method can reduce air pollution, it generates a large amount of desulfurization wastewater containing high concentrations of chloride ions, sulfate ions, and heavy metal ions. Direct discharge of this wastewater would cause great harm to the environment, so it is necessary to treat this wastewater to render it harmless.

[0003] In existing technologies, the treatment of these flue gas desulfurization wastewater involves heating the wastewater, causing part of it to be discharged as steam. The steam is then condensed back into water, and the remaining wastewater forms concentrated crystal slurry or solid waste residue. This concentrated crystal slurry or solid waste residue is then separated from the solid salt by equipment such as a vortex salt separator or centrifuge, thus completing the treatment of the flue gas desulfurization wastewater. However, in this process, scale from the flue gas wastewater adheres to the surface of the heating equipment, forming a scale layer. The thermal resistance of the scale layer is much greater than that of the metal wall, resulting in a 20%-50% reduction in evaporation. At the same time, uneven scale layer can cause local overheating of the heating elements, accelerating metal corrosion and pipe deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater treatment device for flue gas desulfurization in coal-fired boilers to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a wastewater treatment device for flue gas desulfurization in coal-fired boilers, comprising an evaporation tower, a steam frame mounted on the evaporation tower, and a steam delivery pipe installed on the evaporation tower, which is connected to the steam frame. External steam enters the steam delivery pipe through the steam frame, and the heat contained in the steam is transferred to the wastewater in the evaporation tower through the thermal conductivity of the steam delivery pipe wall, thereby evaporating and concentrating the wastewater. A cleaning frame is mounted on the evaporation tower, and a cleaning ring is mounted on the cleaning frame, which contacts the outer wall of the steam delivery pipe. A power generating mechanism is mounted on the evaporation tower, which uses steam as power to drive the cleaning frame to move through a transmission component, so that the cleaning ring cleans the outer wall of the steam delivery pipe.

[0006] Furthermore, the steam generating mechanism consists of a steam pressurizing horn bucket, a fan roller, a transmission assembly, a reciprocating screw, and a connecting frame. The steam pressurizing horn bucket is installed on the evaporation tower with its smaller port facing upwards. The fan roller is rotatably installed on the evaporation tower, positioned above the steam pressurizing horn bucket. The reciprocating screw is rotatably installed on the evaporation tower. The transmission assembly is located on the evaporation tower and is used to drive the fan roller to rotate the reciprocating screw. The connecting frame is located on the evaporation tower and is connected to the reciprocating screw. The connecting frame is also connected to the cleaning frame and is used to move the cleaning frame as the reciprocating screw rotates.

[0007] Furthermore, the connecting frame consists of a lifting frame and a rotating frame. The lifting frame is connected to a reciprocating screw and is used to move up and down according to the rotation of the reciprocating screw. The rotating frame is rotatably connected to the lifting frame, so that the cleaning frame and the lifting frame are in a rotatably connected state.

[0008] Furthermore, the steam delivery pipe is designed in a spiral shape to increase the contact time between the steam and the wastewater.

[0009] Furthermore, an annular cleaning plate is installed on the cleaning frame. The annular cleaning plate contacts the inner wall of the evaporation tower and is used to clean the inner wall of the evaporation tower. Multiple stirring blades are installed between the annular cleaning plate and the cleaning frame, and filter screens are installed between the multiple stirring blades.

[0010] Furthermore, multiple agitator blades are all set at an angle, which allows for better agitation of the wastewater.

[0011] Furthermore, the steam pressurization funnel has multiple pressure-reducing holes, and a fixing ring is installed on the evaporation tower. A connecting rod is slidably installed on the fixing ring, and a sealing head is installed at the bottom of the connecting rod. The sealing head extends into the pressure-reducing hole to seal it. A pressure spring is sleeved on the connecting rod. The top of the pressure spring is connected to the fixing ring, and the bottom of the pressure spring is connected to the sealing head. When the pressure at the bottom of the steam pressurization funnel is too high, the pressure pushes the sealing head up and completes the pressure relief operation through the pressure-reducing hole.

[0012] Furthermore, the top port of the steam-pressurized funnel is rectangular, and the fan-blade roller portion is located above the steam-pressurized funnel.

[0013] Furthermore, a separator is installed on the inner wall of the bottom of the evaporator. The separator is used to separate the reciprocating screw from the wastewater, thereby reducing damage to the reciprocating screw.

[0014] Furthermore, a cleaning component is fitted onto the steam conveying pipe. The cleaning component is located at the lower part of the steam conveying pipe and contacts the bottom inner wall of the evaporation tower. The cleaning component is made of an elastic material and contacts the outer wall of the steam conveying pipe.

[0015] The present invention has the following beneficial effects: (1) In the process of use, the present invention sets the steam conveying pipe in a spiral shape and uses multiple pipes to increase the contact surface and contact time between steam and wastewater, thereby improving the heat exchange effect between steam and wastewater. At the same time, the steam conveying is used as the power to drive the fan blade roller to rotate, and then the reciprocating screw is driven to rotate through the transmission component, thereby driving the cleaning frame to move back and forth. The cleaning frame completes the cleaning of the outer wall of the steam conveying pipe, thereby avoiding the formation of scale on the outer wall of the steam conveying pipe, ensuring the evaporation effect of steam on wastewater. At the same time, the movement of steam in the evaporation tower is used as the power, so that the evaporation tower has a high self-cleaning function, no external power is required, saving cleaning costs, and making better use of steam resources.

[0016] (2) The present invention provides a steam pressurization funnel on the evaporation tower to regulate the steam delivery pressure in the evaporation tower, thereby ensuring that the steam has the impact force to drive the fan blade roller to rotate. The steam pressurization funnel is also provided with a pressure reduction hole and a plug to release pressure through the pressure reduction hole when the pressure in the evaporation tower is too high, thereby ensuring the safety of the evaporation tower.

[0017] (3) During the process of the cleaning frame moving with the reciprocating screw, the stirring plate will move. Under the action of the stirring plate, the wastewater can be stirred. By stirring the wastewater, the probability of impurities in the wastewater adhering to the steam conveying pipe can be reduced, and the probability of scale formation can be reduced. At the same time, stirring the wastewater can better promote the generation of steam from the wastewater, and improve the evaporation efficiency of the evaporation tower. Meanwhile, by setting a filter screen between the stirring plates, when the remaining concentrate in the evaporation tower is discharged, the impurities on the surface of the liquid can be pushed downwards. When they move to the level with the discharge pipe, they will be discharged first with the concentrate, avoiding the residue at the bottom of the evaporation tower when the concentrate is low in the later stage, which cannot be completely discharged. In summary, the cleaning effect of the evaporation tower can be guaranteed, and there is no need to stop the machine for cleaning, thus ensuring the wastewater treatment efficiency.

[0018] (4) The present invention provides a cleaning component on the outside of the steam conveying pipe. The cleaning component is similar to a spring and is set on the bottom inner wall of the evaporation tower. During the descent of the cleaning frame, the cleaning component will be squeezed. During the contraction process, the cleaning component will scrape off the impurities adhering to the outside of the steam conveying pipe. When the cleaning frame rises too fast, the cleaning component is prone to rebound when it loses contact with the cleaning frame. This will cause a collision with the steam conveying pipe. The vibration generated by the collision further improves the cleaning effect on the outer wall of the steam conveying pipe. Due to the elasticity of the cleaning component, an elastic cleaning state can be formed at the bottom of the steam conveying pipe. At the same time, the elastic setting of the cleaning component also provides elasticity when the cleaning frame descends to the bottom, avoiding damage and wear to the reciprocating screw during the rapid descent of the moving device under the rotation of the reciprocating screw, thus ensuring the service life of the reciprocating screw.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a schematic diagram of the connection structure between the steam pressurized funnel and the sealing head in this invention; Figure 5 This is a schematic diagram of the steam-pressurized funnel bucket in this invention; Figure 6 This is a schematic diagram of the conductive component in this invention; Figure 7 This is a schematic diagram of the cleaning frame and cleaning ring in this invention; Figure 8 This is a schematic diagram of the steam pressurized horn bucket and fan blade roller in this invention.

[0022] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Evaporation tower; 2. Steam frame; 3. Steam exhaust pipe; 4. Water inlet pipe; 5. Drain pipe; 6. Steam inlet pipe; 7. Condensate exhaust pipe; 8. Steam pressurization funnel; 9. Fan blade roller; 10. Steam conveying pipe; 11. Reciprocating screw; 12. Movers; 13. Connecting frame; 1301. Lifting frame; 1302. Rotating frame; 14. Cleaning frame; 15. Cleaning ring; 16. Stirring blade; 17. Cleaning component. Detailed Implementation

[0023] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-8As shown, this invention relates to a wastewater treatment device for flue gas desulfurization in a coal-fired boiler, comprising an evaporation tower 1. A steam discharge pipe 3 is installed at the top of the evaporation tower 1 to discharge steam generated from the wastewater within the evaporation tower 1, as well as steam used for heating the wastewater. An inlet pipe 4 is installed on the evaporation tower 1 to input the wastewater to be evaporated. A drain pipe 5 is installed on the evaporation tower 1 to discharge the concentrated liquid remaining after the wastewater evaporation. A steam frame 2 is provided on the evaporation tower 1, and a steam inlet pipe 6 is installed on the steam frame 2 to transport steam generated by an external evaporator into the steam frame 2. In actual use, the pipe connected to the steam inlet pipe 6 or the steam discharge pipe... A pressurizing device is installed on top of the steam frame 2. This device can be a blower, with both its air inlet and outlet connected to the steam delivery pipeline. Starting the blower increases the steam's flowability, giving it a certain impact as it enters the evaporator tower 1, while also providing power for the rotation of the fan blades 9. A condensate drain pipe 7 is installed at the bottom of the steam frame 2 to drain the condensate generated during the steam delivery pipeline 10. A valve is installed on the condensate drain pipe 7. Normally, the valve is closed to prevent steam from escaping through the pipeline. When the condensate in the steam frame 2 reaches a certain capacity, the valve is opened to drain the condensate. During this process, [the following steps can be taken]. A sensor is installed on the steam frame 2 to monitor the volume of condensate inside the steam frame 2. A drain hole is provided on the inner wall of the bottom of the evaporator tower 1, which is connected to the steam frame 2 to discharge water flowing into the partition ring. A steam delivery pipe 10 is installed on the evaporator tower 1. The steam delivery pipe 10 is spirally arranged to increase the contact time between the steam and the wastewater. The steam delivery pipe 10 is connected to the steam frame 2, and external steam enters the steam delivery pipe 10 through the steam frame 2. The heat contained in the steam is transferred to the wastewater in the evaporator tower 1 through the thermal conductivity of the steam delivery pipe wall, evaporating and concentrating the wastewater. Multiple steam delivery pipes 10 are installed, and the evaporator tower 1 is equipped with a ring-shaped... The tops of multiple steam delivery pipes 10 are connected to an annular pipe. A steam outlet is provided on the annular pipe, which is set downward so that the steam comes into contact with the top of the wastewater after exiting the annular pipe, thereby improving the evaporation effect of the wastewater. The impact liquid of the steam can also partially impact and clean the moving cleaning frame 14. A cleaning frame 14 is provided on the evaporation tower 1, and a cleaning ring 15 is provided on the cleaning frame 14. The cleaning ring 15 contacts the outer wall of the steam delivery pipe 10. A power generating mechanism is provided on the evaporation tower 1. The power generating mechanism uses steam as power and drives the cleaning frame 14 to move through the transmission component. The cleaning ring 15 cleans the outer wall of the steam delivery pipe 10.

[0025] The steam generating mechanism consists of a steam pressurized horn bucket 8, a fan roller 9, a transmission assembly, a reciprocating screw 11, and a connecting frame 13. The steam pressurized horn bucket 8 is mounted on the evaporation tower 1, with its smaller end facing upwards. The fan roller 9 is rotatably mounted on the evaporation tower 1, positioned above the steam pressurized horn bucket 8. The reciprocating screw 11 is rotatably mounted on the evaporation tower 1. The transmission assembly is located on the evaporation tower 1 and is used to drive the fan roller 9 to rotate the reciprocating screw 11. The transmission assembly consists of a mounting frame, on which a transmission rod is rotatably mounted. The top end of the reciprocating screw 11 extends into the mounting frame and is rotatably connected to it. One end of the fan roller 9 is fitted with a bevel gear 1, and the top end of the transmission rod is fitted with a bevel gear 2, which is rotatably connected to the transmission rod. The bottom end of the transmission rod is fitted with a circular gear 1. The reciprocating screw 1... A circular gear 2 is fitted at the top of the evaporator 1, and a circular gear 3 is rotatably installed inside the mounting frame. The circular gear 3 meshes with the circular gear 1 and the circular gear 2. A connecting frame 13 is installed on the evaporator 1 and is connected to the reciprocating screw 11 and the cleaning frame 14. The connecting frame 13 is used to drive the cleaning frame 14 to move with the rotation of the reciprocating screw 11. A matching mover 12 is installed on the reciprocating screw 11. The mover 12 moves cyclically under the action of the reciprocating screw 11. In actual use, a corrugated sleeve needs to be fitted on the reciprocating screw 11. The corrugated sleeve has a certain heat resistance and is used to protect the reciprocating screw 11 and reduce its impact from steam. A separator is installed on the bottom inner wall of the evaporator 1. The separator is used to separate the reciprocating screw 11 from the wastewater and reduce the damage to the reciprocating screw 11.

[0026] The connecting frame 13 consists of a lifting frame 1301 and a rotating frame 1302. The lifting frame 1301 is connected to the reciprocating screw 11 and moves up and down according to the rotation of the reciprocating screw 11. The rotating frame 1302 is rotatably connected to the lifting frame 1301, so that the cleaning frame 14 and the lifting frame 1301 are in a rotatably connected state. The lifting frame 1301 consists of a concave strip and a moving ring. The concave strip is bolted to the mover 12. The moving ring is sleeved on the separator cylinder and is slidably connected to the separator cylinder. A sliding groove is provided on the side, and a slider is installed on the moving ring. The slider is slidably connected to the sliding groove. One side of the concave strip is connected to the moving ring. The rotating frame 1302 is composed of a T-shaped ring and a connecting plate. A T-shaped ring groove is provided on the moving ring. The T-shaped ring is rotatably installed in the T-shaped ring groove. The connecting plate is installed on the T-shaped ring. During the process of the lifting frame 1301 moving up and down with the reciprocating screw 11, the rotating frame 1302 rotates under the limiting action of the steam conveying pipe 10, thereby adapting to the cleaning needs of the surface of the steam conveying pipe 10.

[0027] An annular cleaning plate is installed on the cleaning frame 14. The annular cleaning plate contacts the inner wall of the evaporation tower 1 and is used to clean the inner wall of the evaporation tower 1. Multiple stirring plates 16 are installed between the annular cleaning plate and the cleaning frame 14. A filter screen is installed between each of the multiple stirring plates 16. The multiple stirring plates 16 are all inclined. The inclined stirring plates 16 can better agitate the wastewater.

[0028] The steam pressurized funnel 8 has multiple pressure-reducing holes. A fixing ring is installed on the evaporator tower 1, and a connecting rod is slidably installed on the fixing ring. A sealing head is installed at the bottom of the connecting rod, and the sealing head extends into the pressure-reducing hole to seal it. A pressure spring is sleeved on the connecting rod. The top of the pressure spring is connected to the fixing ring, and the bottom of the pressure spring is connected to the sealing head. When the pressure at the bottom of the steam pressurized funnel 8 is too high, the pressure pushes the sealing head up and completes the pressure relief operation through the pressure-reducing hole. The top port of the steam pressurized funnel 8 is rectangular, and part of the fan roller 9 is located above the steam pressurized funnel 8.

[0029] A cleaning component 17 is fitted onto the steam conveying pipe 10. The cleaning component 17 is located at the lower part of the steam conveying pipe 10 and is in contact with the bottom inner wall of the evaporation tower 1. The cleaning component 17 is made of elastic material and is in contact with the outer wall of the steam conveying pipe 10.

[0030] In operation, wastewater to be treated is input into the evaporator tower 1 through the inlet pipe 4, and steam is then input into the steam frame 2 through the steam inlet pipe 6. The steam enters the evaporator tower 1 through the steam conveying pipe 10, heating and evaporating the wastewater. The steam from the wastewater evaporation, along with the steam entering the evaporator tower 1 through the steam conveying pipe 10, is discharged through the steam outlet pipe 3 and enters the steam treatment equipment. As the steam rises within the evaporator tower 1, it passes through the steam pressurization funnel 8 and acts on the fan blade roller 9, causing it to rotate. This rotation, via the transmission assembly, drives the reciprocating screw 11 to rotate, and then the connecting frame 13 moves the cleaning frame 14. The cleaning frame 14 cleans the outer wall of the steam conveying pipe 10, ensuring the cleanliness of the steam and wastewater within the steam conveying pipe 10. The heat exchange effect is improved. During the movement of the cleaning frame 14, the wastewater can be stirred by the stirring plate 16, thereby improving the evaporation efficiency of the wastewater. After the cleaning frame 14 moves down a certain distance, it will squeeze the cleaning component 17, which can further clean the steam conveying pipe 10. The elastic setting of the cleaning component 17 can provide a buffer for the descending cleaning frame 14, reducing the damage to the reciprocating screw 11. At the same time, the elastic setting of the cleaning component 17 can also effectively remove stubborn impurities on the steam conveying pipe 10, ensuring the cleaning effect of the steam cleaning pipe. After the wastewater evaporates to a certain extent, the remaining wastewater will form a concentrated liquid, which will be discharged through the drain pipe 5, completing the evaporation treatment of the wastewater.

[0031] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wastewater treatment device for flue gas desulfurization from a coal-fired boiler, comprising an evaporation tower (1), characterized in that: A steam frame (2) is provided on the evaporator (1), and a steam conveying pipe (10) is installed on the evaporator (1). The steam conveying pipe (10) is connected to the steam frame (2). External steam enters the steam conveying pipe (10) through the steam frame (2). The heat contained in the steam is converted into the wastewater in the evaporator (1) through the thermal conductivity of the steam conveying pipe wall, so as to evaporate and concentrate the wastewater. An evaporator (1) is provided with a cleaning frame (14) and a cleaning ring (15) is provided on the cleaning frame (14). The cleaning ring (15) contacts the outer wall of the steam conveying pipe (10). An evaporator (1) is provided with a power generating mechanism. The power generating mechanism uses steam as power and drives the cleaning frame (14) to move through the transmission component, so that the cleaning ring (15) can clean the outer wall of the steam conveying pipe (10).

2. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 1, characterized in that: The steam generating mechanism consists of a steam pressurized horn bucket (8), a fan roller (9), a transmission assembly, a reciprocating screw (11), and a connecting frame (13). The steam pressurized horn bucket (8) is installed on the evaporation tower (1), with the smaller port of the steam pressurized horn bucket (8) facing upwards. The fan roller (9) is rotatably installed on the evaporation tower (1) and is located above the steam pressurized horn bucket (8). The reciprocating screw (11) is rotatably installed on the evaporation tower (1). The transmission assembly is installed on the evaporation tower (1) and is used to make the fan roller (9) drive the reciprocating screw (11) to rotate. The connecting frame (13) is installed on the evaporation tower (1) and is connected to the reciprocating screw (11). The connecting frame (13) is connected to the cleaning frame (14) and is used to drive the cleaning frame (14) to move with the rotation of the reciprocating screw (11).

3. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 2, characterized in that: The connecting frame (13) consists of a lifting frame (1301) and a rotating frame (1302). The lifting frame (1301) is connected to the reciprocating screw (11) and is used to move up and down according to the rotation of the reciprocating screw (11). The rotating frame (1302) is rotatably connected to the lifting frame (1301) so that the cleaning frame (14) and the lifting frame (1301) are in a rotatably connected state.

4. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 3, characterized in that: The steam delivery pipe (10) is spirally designed to increase the contact time between steam and wastewater.

5. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 4, characterized in that: An annular cleaning plate is installed on the cleaning frame (14). The annular cleaning plate contacts the inner wall of the evaporator (1) and is used to clean the inner wall of the evaporator (1). Multiple stirring plates (16) are installed between the annular cleaning plate and the cleaning frame (14), and filter screens are provided between the multiple stirring plates (16).

6. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 5, characterized in that: Multiple stirring plates (16) are set at an angle, which can better agitate the wastewater.

7. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 6, characterized in that: Multiple pressure-reducing holes are provided on the steam pressurized horn bucket (8). A fixed ring is installed on the evaporator tower (1). A connecting rod is slidably installed on the fixed ring. A sealing head is installed at the bottom of the connecting rod. The sealing head extends into the pressure-reducing hole to complete the sealing of the pressure-reducing hole. A pressure spring is sleeved on the connecting rod. The top of the pressure spring is connected to the fixed ring. The bottom of the pressure spring is connected to the sealing head. When the pressure at the bottom of the steam pressurized horn bucket (8) is too high, the pressure pushes the sealing head up and completes the pressure relief operation through the pressure-reducing hole.

8. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 7, characterized in that: The top port of the steam-pressurized horn bucket (8) is rectangular, and part of the fan blade roller (9) is located above the steam-pressurized horn bucket (8).

9. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 8, characterized in that: A separator is installed on the bottom inner wall of the evaporator (1). The separator is used to separate the reciprocating screw (11) from the wastewater and reduce the damage to the reciprocating screw (11).

10. The wastewater treatment equipment for flue gas desulfurization of a coal-fired boiler according to claim 9, characterized in that: A cleaning component (17) is fitted onto the steam conveying pipe (10). The cleaning component (17) is located at the lower part of the steam conveying pipe (10) and is in contact with the bottom inner wall of the evaporation tower (1). The cleaning component (17) is made of elastic material and is in contact with the outer wall of the steam conveying pipe (10).

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