A dosing device and method for treating desulfurization wastewater from a coal-fired power plant

Abstract

This invention relates to the field of wastewater treatment technology, specifically to a dosing device and method for treating desulfurization wastewater from a coal-fired power plant. The dosing device includes a dosing mechanism, a flow channel, and a flow equalization component disposed within the flow channel. The dosing mechanism is used to add chemicals into the flow channel. The flow channel is connected to the inlet of a pretreatment tank, through which wastewater flows to the pretreatment tank. The flow equalization component is slidably connected to the flow channel and is used to intercept wastewater within the flow channel. The flow equalization component has a drain outlet for wastewater to pass through. In this dosing device for treating desulfurization wastewater from a coal-fired power plant, the flow equalization component, on the one hand, smooths out wastewater flow fluctuations by pre-intercepting wastewater, eliminating the need to adjust the metering pump when wastewater flow fluctuations are small; on the other hand, when wastewater flow is large, the flow equalization component diverts the wastewater before it converges, disrupting the wastewater's state and allowing chemicals to enter the middle and lower layers of the wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a dosing device and method for treating desulfurization wastewater from a coal-fired power plant. Background Technology

[0002] Coal-fired power plants still occupy an important position in my country's energy structure, generating large amounts of sulfur dioxide flue gas during power generation. Currently, the limestone-gypsum wet desulfurization process is widely used due to its high desulfurization efficiency and mature technology. This process absorbs sulfur dioxide from flue gas by spraying limestone slurry, and while purifying the flue gas, it continuously generates a certain amount of desulfurization wastewater.

[0003] The treatment of desulfurization wastewater generally adopts a process of "pretreatment + flue gas waste heat concentration + bypass tower rotary atomization drying". First, flocculants and organic sulfides are added to the wastewater for pretreatment, resulting in pretreated water with low hardness and acceptable turbidity. Then, the pretreated water is significantly concentrated using the waste heat from the power plant's low-grade flue gas. Finally, a small-flow, high-temperature flue gas (approximately 300-400℃) is drawn from the boiler flue (e.g., after the economizer) and sent to the top of the bypass drying tower to dry the atomized wastewater. Ultimately, the purified flue gas is discharged through the chimney after passing through the desulfurization system.

[0004] However, the current dosing equipment still has the following problems during use: First, since the wastewater inflow of desulfurization wastewater from coal-fired power plants often fluctuates (such as system flushing, unit load changes, etc.), the frequency or stroke of the metering pump controlling the reagents needs to be adjusted in real time. When the wastewater inflow fluctuates frequently, the metering pump also needs to be adjusted frequently. Secondly, the dosing point for the chemicals is usually located at the inlet of the pretreatment tank. When the inflow of wastewater is large, the chemicals may remain on the surface of the wastewater due to insufficient initial mixing energy, making it difficult to quickly penetrate into the middle and lower layers of the water. This can lead to areas with excessively high or low concentrations, requiring subsequent mixing units to operate for longer mixing times or with higher mixing power to achieve homogenization. Summary of the Invention

[0005] The purpose of this invention is to provide a dosing device and method for treating desulfurization wastewater from coal-fired power plants. This method solves the problems mentioned in the background art by smoothing out wastewater flow fluctuations and disrupting the state of the wastewater, namely, the frequent adjustment of the metering pump and the difficulty of the reagents to quickly penetrate into the middle and lower water layers.

[0006] To achieve the above objectives, one objective of this invention is to provide a chemical dosing device for desulfurization wastewater treatment in a coal-fired power plant, comprising a chemical supply mechanism, a flow channel, and a flow equalization component disposed within the flow channel. The chemical supply mechanism is used to add chemicals into the flow channel. The flow channel is connected to the inlet of a pretreatment tank, and wastewater flows to the pretreatment tank through the flow channel. The flow equalization component is slidably connected to the water tank and is used to intercept wastewater in the water tank; the flow equalization component has a drain outlet for wastewater to pass through; It also includes a drive unit for driving the flow equalization element to slide in order to change the water delivery volume of the drain outlet; A flow equalization component is provided with a flow divider on its back side. When the wastewater flow rate reaches a preset condition, the driving component drives the flow equalization component to position a portion of the drain outlet at the flow divider. The flow divider then diverts and re-converges the wastewater, thereby promoting the entry of the reagent into the wastewater.

[0007] The diversion plate is horizontally positioned within the flow channel, with one end of the diversion plate slidably attached to the backwater side of the flow equalization component. This sliding attachment prevents wastewater above the diversion plate from flowing through gaps to below it. In the above technical solution, the flow equalization component with a drain outlet pre-accumulates wastewater by adjusting the size of the drain outlet, thereby mitigating flow fluctuations when wastewater flow fluctuates subsequently. When the wastewater flow increases, the drain outlet rises to the diversion plate, which divides the wastewater into two streams. When the wastewater from the top flows into the wastewater from the bottom, it carries the reagent into the wastewater.

[0008] Based on this, the drug supply mechanism includes a drug storage tank for storing the drug and a drug supply system. The drug supply system includes a metering pump and a PLC control cabinet. The PLC control cabinet automatically adjusts the frequency or stroke of the metering pump according to a preset program. The drain end of the metering pump is connected to the drug supply pipe. The drug delivery points of the drug supply pipe are set at converging points or diverting plates.

[0009] When the dosing point corresponds to the converging section, the agent is thrown into the wastewater at the bottom of the converging section by the wastewater at the top of the diversion plate; when the dosing point corresponds to the diversion plate, the agent first comes into contact with the wastewater at the top of the diversion plate, and then enters the wastewater at the bottom along with the wastewater at the top.

[0010] The water flow rate of the drain outlet is equal to or greater than the average drainage rate of wastewater discharged into the water channel.

[0011] Based on this, when the width of the drain outlet corresponds to the width of the water trough, the height of the drain outlet is less than the distance between the diversion plate and the bottom inner wall of the water trough, which causes a gap to be created between the wastewater at the bottom and the wastewater at the top of the diversion plate, increasing the kinetic energy of the wastewater at the top of the diversion plate flowing downward.

[0012] The second objective of this invention is to provide a method for a chemical dosing device for treating desulfurization wastewater from a coal-fired power plant, comprising the following steps: S1. Cover the drain outlet to raise the wastewater level to the preset height, then open the drain outlet to drain water at a rate of 4 liters / second. S2. When the wastewater level exceeds 50% of the preset height, calculate the upward movement distance of the flow equalization element. Upward movement distance = ; In the formula, The height of the manifold. The height of the middle part of the drain outlet; S3. After the flow equalization element moves upward, the wastewater in the lower half of the corresponding drain outlet flows to the bottom of the flow divider plate at a speed of 2 liters / second, and the wastewater in the upper half of the corresponding drain outlet flows to the top of the flow divider plate at a speed of 2 liters / second. S4. There is a height difference between the wastewater located below the diversion plate and the diversion plate, which causes the wastewater at the top to flow downwards and generate inertial force, so as to be flushed into the wastewater at the bottom for collection. S5. Part of the reagent in the dosing tank is discharged through the second discharge port to contact the wastewater at the top of the diversion plate, and the other part is discharged through the first discharge port to the collection area. The wastewater at the top of the diversion plate flows into the middle and lower layers of the bottom wastewater, which also causes the reagent to contact the middle and lower layers of the wastewater.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In this chemical dosing device and method for desulfurization wastewater treatment in a coal-fired power plant, a flow equalization element is installed. On the one hand, the flow equalization element smooths out wastewater flow fluctuations by pre-intercepting the wastewater, so that when the wastewater flow fluctuations are small, there is no need to adjust the metering pump. On the other hand, when the wastewater flow is large, the flow equalization element guides the wastewater to the top and bottom of the diversion plate by moving upward, so that the wastewater is diverted and then converged. The convergence disturbs the state of the wastewater, allowing the chemical agent to enter the middle and lower layers of the wastewater, reducing the subsequent stirring time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the drug supply mechanism of the present invention; Figure 3 This is a schematic diagram of the structure of the water tank of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the water tank of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the flow equalization element of the present invention; Figure 6 This is a schematic diagram of the dosing tank of the present invention; Figure 7 This is a schematic diagram of the working state of the flow equalization element of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the working state of the flow equalization element of the present invention. Figure 2 .

[0015] The meanings of the labels in the diagram are as follows: 100. Drug supply mechanism; 101. Drug storage tank; 102. Drug supply system; 103. Drug supply pipe; 110. Water flow channel; 111. Sensor; 112. Sealing part; 120. Flow equalization component; 121. Drain outlet; 122. Water blocking part; 123. Water permeable part; 124. Water retaining part; 125. Driving component; 130. Diverter plate; 140. Dosing tank; 141. First drug discharge port; 142. Second drug discharge port; 200. Pretreatment tank. Detailed Implementation

[0016] The technical solutions in 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.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] To address the problems of frequent metering pump adjustments and difficulty in quickly penetrating the middle and lower water layers, one objective of this invention is to provide a dosing device for desulfurization wastewater treatment in coal-fired power plants. For example... Figure 1As shown, the wastewater treatment dosing device includes a dosing mechanism 100, a flow channel 110, and a flow equalization component 120 disposed within the flow channel 110. In this embodiment, the wastewater treatment agents include sodium hydroxide (NaOH), organic sulfides (such as TMT-15), polyaluminum chloride (PAC), polyacrylamide (PAM) (prepared into an aqueous solution of a certain concentration using specialized equipment), hydrochloric acid (HCl), or citric acid, etc.

[0020] like Figure 1 As shown, a wastewater treatment dosing device is used in wastewater treatment equipment, which has multiple pretreatment tanks 200 connected in sequence. A flow channel 110 is connected to the inlet of the first pretreatment tank 200, and wastewater flows to the pretreatment tank 200 through the flow channel 110. A stirring unit is installed inside the pretreatment tank 200 to uniformly stir the wastewater and chemicals.

[0021] exist Figure 2 In the illustrated embodiment, the drug supply mechanism 100 mainly consists of a drug storage tank 101 for storing drugs and a drug supply system 102. The drug storage tank 101 is typically made of corrosion-resistant materials such as polyethylene (PE) or fiberglass (FRP); it is equipped with a level gauge (such as a magnetic float level gauge or an ultrasonic level gauge) to monitor the drug quantity in real time; and it has a breather valve and a manhole (for personnel to enter the equipment). The drug supply system 102 includes a metering pump and a PLC control cabinet. The PLC control cabinet can automatically adjust the frequency or stroke of the metering pump according to a preset program (such as PID control); the drain end of the metering pump is connected to the drug supply pipe 103, one end of which extends above the water tank 110, allowing the drug to be poured into the water tank 110.

[0022] The flow channel 110 is a U-shaped structure with one end closed. The closed end is used to cooperate with the flow equalization component 120 to intercept wastewater, while the unclosed end is connected to the inlet of the pretreatment tank 200, allowing the wastewater in the flow channel 110 to flow into the pretreatment tank 200.

[0023] Wastewater from the coal-fired power plant flows into the flow channel 110, where the flow equalization element 120 smooths out the flow fluctuations and changes the flow state when the wastewater reaches a preset flow rate, thereby preventing localized excessively high or low concentrations. Specifically, for example... Figure 3As shown, the flow equalization component 120 is used to intercept wastewater in the flow tank 110, and a drain outlet 121 is provided through the side wall of the flow equalization component 120 along the wastewater flow direction, allowing the wastewater to continue flowing through the drain outlet 121. The flow equalization component 120 is slidably connected to the flow tank 110, and its sliding direction is perpendicular to the wastewater flow direction. Furthermore, a driving component 125 (e.g., a cylinder, electric push rod, etc.) is provided on the top of the flow equalization component 120, and the driving component 125 drives the flow equalization component 120 to slide to change the water delivery volume of the drain outlet 121. Next, a diversion plate 130 is horizontally arranged in the flow tank 110, and the diversion plate 130 is located on the back side of the flow equalization component 120. Figure 3 (On the right side of the image), when the wastewater flow rate reaches the preset condition, the drive component 125 drives the flow equalization component 120 to partially position the drain outlet 121 at the diversion plate 130, causing the diversion plate 130 to divert and then re-converge the wastewater. Through the diversion and re-convergence effect, the reagent is encouraged to enter the lower layer of the wastewater. This design reduces frequent fluctuations in wastewater flow rate and the phenomenon of excessively high or low local concentrations.

[0024] The drug supply pipe 103 is installed at the corresponding converging point to deliver the drug to the converging point.

[0025] In the above, the wastewater flow rate is monitored by sensor 111. Sensor 111 can be a level sensor, flow sensor, etc. Taking a level sensor as an example, the level sensor is installed in the flow tank 110 and located on the water-facing side of the flow equalization component 120. When the water level on the water-facing side of the flow equalization component 120 rises, it indicates that the wastewater flow rate increases; conversely, it indicates that the wastewater flow rate decreases.

[0026] Specifically, such as Figure 4 As shown, the flow equalization element 120 has a plate-like structure, with both ends extending to the inner wall of the water tank 110 to intercept wastewater. Simultaneously, a vertical groove is provided on the inner wall of the water tank 110, allowing the flow equalization element 120 to slide up and down along the groove. Furthermore, a sealing portion 112 protrudes downwards at the bottom of the water tank 110 corresponding to the flow equalization element 120. The sealing portion 112 has a hollow structure to allow the sliding flow equalization element 120 to enter. Thus, when the drain outlet 121 enters the sealing portion 112, the sealing portion 112 blocks the entry point of the drain outlet 121, reducing the space for wastewater to pass through, thereby reducing the wastewater flow rate. When the drain outlet 121 is not within the sealing portion 112, there is no obstruction problem, and the water flow rate of the drain outlet 121 is at its maximum.

[0027] In practice, the water flow rate of the drain outlet 121 should be equal to or greater than the average drainage volume of wastewater discharged into the water trough 110. If the water flow rate of the drain outlet 121 is less than the drainage volume of wastewater discharged into the water trough 110, the water level on the water-facing side of the flow equalization component 120 will gradually increase, causing wastewater to overflow from the top of the water trough 110.

[0028] In addition, this solution also includes a dosing tank 140 inside the water tank 110. The dosing tank 140 is located below the supply pipe 103. The bottom of the dosing tank 140 is provided with a first discharge port 141, and a second discharge port 142 is provided on the side near the diversion plate 130. The height of the second discharge port 142 is higher than that of the first discharge port 141. When the amount of medicine is small, the medicine is discharged only through the first discharge port 141, while when the amount of medicine is large, the medicine is discharged simultaneously through the first discharge port 141 and the second discharge port 142.

[0029] by Figure 5 The dotted line in the diagram serves as a dividing line. The flow equalization component 120 is divided from top to bottom into a water-blocking section 122, a water-permeable section 123, and a water-retaining section 124. The drain outlet 121 is located at the water-permeable section 123. Based on the above, the working principle of this invention will be further described in detail below: First, the flow equalization element 120 is driven downward, so that the drain outlet 121 is fully inserted into the sealing part 112. When the wastewater is discharged into the water tank 110, the drain outlet 121 is blocked by the sealing part 112, and the water-blocking part 122 blocks the flow of wastewater. At this time, the wastewater accumulates on the water-facing side of the flow equalization element 120, causing the wastewater level to rise. Then, when the wastewater level rises to the preset height A, the drain outlet 121 is controlled to move upward according to the wastewater discharge volume. The water delivery volume after the drain outlet 121 moves upward corresponds to the wastewater discharge volume. Therefore, when the wastewater is discharged through the drain outlet 121, the wastewater level height on the water-facing side of the flow equalization element 120 will not change significantly. The PLC control cabinet adjusts the frequency or stroke of the metering pump according to the water delivery volume of the drain outlet 121 at this time. At this time, the corresponding reagent flows into the dosing tank 140 through the supply pipe 103 and drips into the flowing wastewater through the first discharge port 141. During this process, if the wastewater discharge volume fluctuates briefly, the wastewater level on the water-facing side of the flow equalization component 120 will change, but the flow equalization component 120 does not need to be moved, thus avoiding the need to adjust the metering pump.

[0030] Then as Figure 8As shown, when the wastewater discharge increases and the wastewater level rises to height B, the control outlet 121 moves upward to the diversion plate 130, and the water-blocking part 124 blocks the wastewater in the lower layer. In this way, the wastewater in the lower half of the outlet 121 flows below the diversion plate 130, and the wastewater in the upper half of the outlet 121 flows above the diversion plate 130. The two parts of wastewater are separated by the diversion plate 130. After the wastewater at the top of the diversion plate 130 flows past one end, it flows downward into the wastewater at the bottom and converges at area C. During this process, the PLC control cabinet adjusts the frequency or stroke of the metering pump according to the water flow of the drain outlet 121. At this time, the amount of agent entering the dosing tank 140 increases. Part of it is discharged through the second discharge outlet 142 and comes into contact with the wastewater at the top of the diversion plate 130, while the other part is discharged through the first discharge outlet 141 to area C. The wastewater at the top of the diversion plate 130 flows into the middle and lower layers of the bottom wastewater, which also drives the agent to come into contact with the middle and lower layers of the wastewater.

[0031] When the wastewater discharge volume is less than the water delivery volume of the drain outlet 121, the drain outlet 121 is controlled to move downward, so that the drain outlet 121 partially blocks the drain outlet 121, thereby changing the water delivery volume of the drain outlet 121 accordingly.

[0032] It should be noted that the diversion plate 130 may not be set corresponding to the converging part, but may be set directly above the diversion plate 130. The agent is added to the top of the diversion plate 130 so that the agent first contacts the wastewater at the top of the diversion plate 130 and then flows into the wastewater at the bottom.

[0033] Understandably, the flow diversion plate 130 plays a crucial role in diverting the flow. To improve stability, this design slides one end of the flow diversion plate 130 against the backwater side of the flow equalization component 120. This design prevents gaps from forming between the flow diversion plate 130 and the flow equalization component 120, thus avoiding wastewater above the flow diversion plate 130 from flowing through gaps to below the flow diversion plate 130.

[0034] Furthermore, when there is a significant height difference between the wastewater at the top and bottom of the diversion plate 130, the wastewater at the top of the diversion plate 130 will have greater kinetic energy to flow into the lower middle layer of the wastewater at the bottom. Therefore, this solution adjusts the liquid level of the wastewater discharged through the drain outlet 121 to be lower than the height of the diversion plate 130. See details... Figure 3 When the width of the drain outlet 121 corresponds to the width of the water trough 110, the height H1 of the drain outlet 121 is less than the distance H2 between the diversion plate 130 and the bottom inner wall of the water trough 110. As a result, a larger gap will be generated between the wastewater at the bottom and the wastewater at the top of the diversion plate 130, which increases the kinetic energy of the wastewater at the top of the diversion plate 130 flowing downward.

[0035] In summary, this solution utilizes the flow equalization element 120. On one hand, the flow equalization element 120 smooths out wastewater flow fluctuations by pre-intercepting wastewater, eliminating the need to adjust the metering pump when wastewater flow fluctuations are small. On the other hand, when wastewater flow is large, the flow equalization element 120 guides the wastewater to the area above and below the diversion plate 130 by moving upwards, allowing the wastewater to be diverted and then converged. This convergence disrupts the state of the wastewater, enabling the reagent to enter the middle and lower layers of the wastewater and reducing subsequent stirring time.

[0036] The second objective of this invention is to provide a method for a chemical dosing device for treating desulfurization wastewater from a coal-fired power plant, comprising the following steps: S1. Block the drain outlet 121 to raise the wastewater level to the preset height, and then open the drain outlet 121 to drain water at a rate of 4 liters / second. S2. When the wastewater level exceeds 50% of the preset height, calculate the upward movement distance of the flow equalization component 120. Upward movement distance = ; In the formula, The height of the splitter plate 130. The height of the middle part of the drain outlet 121; S3. After the flow equalization component 120 moves upward, the wastewater in the lower half of the corresponding drain outlet 121 flows to the bottom of the flow divider plate 130 at a speed of 2 liters / second, and the wastewater in the upper half of the corresponding drain outlet 121 flows to the top of the flow divider plate 130 at a speed of 2 liters / second. S4. There is a height difference between the wastewater located below the diversion plate 130 and the diversion plate 130, which causes the wastewater at the top to flow downward and generate inertial force, so as to be flushed into the wastewater at the bottom for collection. S5. Part of the reagent in the dosing tank 140 is discharged through the second discharge port 142 to contact the wastewater at the top of the diversion plate 130, and the other part is discharged through the first discharge port 141 to the collection area. The wastewater at the top of the diversion plate 130 flows into the middle and lower layers of the bottom wastewater, which also causes the reagent to contact the middle and lower layers of the wastewater.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dosing device for desulfurization wastewater treatment in a coal-fired power plant, characterized in that: It includes a drug supply mechanism (100), a water flow channel (110), and a flow equalization component (120) disposed in the water flow channel (110). The drug supply mechanism (100) is used to add a drug into the water flow channel (110). The water flow channel (110) is connected to the inlet of the pretreatment tank (200), and wastewater flows to the pretreatment tank (200) through the water flow channel (110). The flow equalization component (120) is slidably connected to the water tank (110), and its sliding direction is perpendicular to the wastewater flow direction, which is used to intercept the wastewater in the water tank (110); the flow equalization component (120) has a drain outlet (121) for wastewater to pass through. It also includes a drive (125) for driving the flow equalization element (120) to slide to change the water delivery of the drain (121); The flow equalization component (120) is provided with a flow divider plate (130) on the back side. When the wastewater flow rate reaches the preset condition, the driving component (125) drives the flow equalization component (120) to make the drain outlet (121) partially located at the flow divider plate (130). The flow divider plate (130) divides and re-converges the wastewater. Through the effect of dividing and re-converging, the agent is promoted to enter the wastewater. The diversion plate (130) is horizontally arranged inside the water tank (110); One end of the diverter plate (130) is slidably attached to the back water side of the flow equalization component (120); The bottom of the water trough (110) protrudes downwards at the part corresponding to the flow equalization component (120) to form a sealing part (112) for the flow equalization component (120) to enter. The sealing part (112) reduces the space for wastewater to pass through the drain outlet (121) by blocking the drain outlet (121); The flow equalization component (120) has a plate-like structure, with both ends extending to the inner wall of the water tank (110); When the width of the drain outlet (121) corresponds to the width of the water trough (110), the height of the drain outlet (121) is less than the distance between the diversion plate (130) and the bottom inner wall of the water trough (110), which causes a gap to be generated between the wastewater at the bottom and the wastewater at the top of the diversion plate (130), increasing the kinetic energy of the wastewater at the top of the diversion plate (130) flowing downward. The water trough (110) is provided with a dosing tank (140); the bottom of the dosing tank (140) is provided with a first dosing outlet (141), and the side near the diversion plate (130) is provided with a second dosing outlet (142).

2. The chemical dosing device for desulfurization wastewater treatment in coal-fired power plants according to claim 1, characterized in that: The drug supply mechanism (100) includes a drug storage tank (101) for storing drugs and a drug supply system (102). The drug supply system (102) includes a metering pump and a PLC control cabinet. The PLC control cabinet automatically adjusts the frequency or stroke of the metering pump according to a preset program. The drain end of the metering pump is connected to the drug supply pipe (103).

3. The chemical dosing device for desulfurization wastewater treatment in coal-fired power plants according to claim 2, characterized in that: The dosing point of the drug supply pipe (103) is set at the corresponding converging part or the diversion plate (130).

4. The chemical dosing device for desulfurization wastewater treatment in coal-fired power plants according to claim 3, characterized in that: The dosing tank (140) is located below the dosing pipe (103).

5. A method for using a chemical dosing device for treating desulfurization wastewater from a coal-fired power plant as described in any one of claims 2-4, characterized in that: The methods and steps include the following: S1. Cover the drain outlet (121) to raise the wastewater level to the preset height, and then open the drain outlet (121) to drain water at a rate of 4 liters / second. S2. When the wastewater level exceeds 50% of the preset height, calculate the upward movement distance of the flow equalization component (120). Upward movement distance = ; In the formula, The height of the manifold (130) The height of the middle part of the drain outlet (121); S3. After the flow equalization component (120) moves upward, the wastewater in the lower half of the corresponding drain (121) flows to the bottom of the flow divider (130) at a speed of 2 liters / second, and the wastewater in the upper half of the corresponding drain (121) flows to the top of the flow divider (130) at a speed of 2 liters / second. S4. There is a height difference between the wastewater located below the diversion plate (130) and the diversion plate (130), which causes the wastewater at the top to flow downward and generate inertial force, so as to be flushed into the wastewater at the bottom for collection. S5. Part of the agent in the dosing tank (140) is discharged through the second discharge port (142) and comes into contact with the wastewater at the top of the diversion plate (130). The other part is discharged through the first discharge port (141) to the collection area. The wastewater at the top of the diversion plate (130) flows into the middle and lower layers of the bottom wastewater, which also drives the agent to come into contact with the middle and lower layers of the wastewater.

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