A small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants

Abstract

This utility model relates to the field of coal-containing wastewater treatment and reuse technology in power plants, specifically a small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants. It can easily remove pollutants from the wastewater, meeting the requirements for compliant discharge and reuse. The system includes a wastewater tank, a coal slurry water purifier, and a clear water tank. The wastewater tank has a central partition forming a coal-containing wastewater sedimentation tank and a regulating tank. Above the central partition is an overflow area. The regulating tank is equipped with a booster pump connected to the inlet of the coal slurry water purifier via a booster pipe. The booster pipe has a chemical dosing port connected to a coagulant supply device and a coagulant aid supply device. The outlet of the coal slurry water purifier is connected to the clear water tank via an outlet pipe.

Description

Technical Field

[0001] This utility model relates to the field of coal-containing wastewater treatment and reuse technology in power plants, specifically a small-scale coal-containing wastewater collection, sedimentation and reuse system for thermal power plants. Background Technology

[0002] Thermal power plants generate a large amount of coal-containing wastewater during the production process. This wastewater mainly comes from seepage water generated by dust suppression spraying in the coal yard, washing wastewater generated by the coal conveying system, rainwater from the coal yard, and dust removal drainage from the coal conveying system.

[0003] Coal-containing wastewater is characterized by high turbidity, high suspended solids concentration, fine particle size, and negatively charged surfaces, causing these particles to remain dispersed in the water. Due to the hydrophobic nature of coal, some tiny coal dust particles in the wastewater are particularly stable in water, and some ultrafine coal dust particles remain suspended and do not settle naturally even after prolonged standing. Currently, there is no particularly rapid and effective treatment system, and some pollutants remain after treatment, which can have a certain impact on the environment. Summary of the Invention

[0004] In order to effectively reduce the concentration of pollutants in coal-containing wastewater from thermal power plants and achieve the purification and resource utilization of coal-containing wastewater, this utility model provides a small-scale coal-containing wastewater collection, sedimentation and reuse system for thermal power plants, which can easily remove pollutants from wastewater and meet the requirements for compliant discharge and reuse.

[0005] The technical solution is as follows: a small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants, characterized in that it includes a wastewater tank, a coal slurry water purifier, and a clear water tank. The wastewater tank is equipped with a middle partition to form a coal-containing wastewater sedimentation tank and an equalization tank. Above the middle partition is an overflow area. The equalization tank is equipped with a booster pump and connected to the inlet of the coal slurry water purifier via a booster pipeline. The booster pipeline is equipped with a chemical dosing port, which is connected to a coagulant supply device and a coagulant aid supply device. The outlet of the coal slurry water purifier is connected to the clear water tank via an outlet pipeline.

[0006] A further feature is that the clear water tank is equipped with a recycled water pump and connected to a recycled water pipeline; The clear water tank is equipped with a backwash water pump, which is connected to the return port of the coal slurry water purifier via a return liquid pipeline. The waste liquid outlet of the coal slurry water purifier is connected to the coal-containing wastewater sedimentation tank through a waste liquid pipeline. Two coal slurry water purifiers are installed.

[0007] After adopting this utility model, the coal-containing wastewater undergoes initial sedimentation, and the supernatant overflows into the equalization tank. Then, the supernatant of the coal slurry is lifted to the coal slurry water purifier using a lift pump. Coagulants and coagulant aids are added along the lift pipeline to promote further flocculation and sedimentation of the supernatant of the coal slurry. After filtration by the coal slurry water purifier, the clarified water enters the clear water tank, meeting the requirements for discharge and reuse. Furthermore, a reuse water pump and a backwash water pump are installed, which can be further reused or used for backwashing of the coal slurry water purifier according to the actual situation of the plant area. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the new utility model system. Detailed Implementation

[0009] See Figure 1 As shown, a small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants includes a wastewater tank 1, a coal slurry water purifier 2, and a clear water tank 3. A partition 4 is installed in the wastewater tank 1 to form a coal-containing wastewater sedimentation tank 5 and a regulating tank 6. Above the partition 4 is an overflow area, allowing the supernatant in the coal-containing wastewater sedimentation tank 5 to overflow into the regulating tank 6. A booster pump 7 is installed in the regulating tank 6 and connected to the inlet of the coal slurry water purifier 2 via a booster pipe 8. Two coal slurry water purifiers 2 are installed, one for operation and one for standby, ensuring continuous operation of the entire system.

[0010] The booster pipe 8 is equipped with a dosing port, which is connected to the coagulant supply device 10 and the coagulant aid supply device 11, respectively, to provide coagulant and coagulant aid to promote further flocculation and sedimentation of the coal slime supernatant; the outlet of the coal slime water purifier 2 is connected to the clear water tank 3 through the outlet pipe 12. The clear water tank 3 is equipped with a recycled water pump 15 and connected to a recycled water pipeline 16, which can be further reused according to the actual situation of the plant area; the clear water tank 3 is equipped with a backwash water pump 13 and connected to the return liquid port of the coal slurry water purifier 2 through the return liquid pipe 9, which can be used for backwashing of the coal slurry water purifier. The wastewater after rinsing is sent back to the coal-containing wastewater sedimentation tank 5 through the waste liquid port of the coal slurry water purifier 2 and the waste liquid pipeline 14.

[0011] Various coal-containing wastewaters from the thermal power plant are collected through the drainage system and enter the coal-containing wastewater sedimentation tank 5. After initial sedimentation, the supernatant overflows into the equalization tank 6. The equalization tank 6 is equipped with a lift pump 7, which lifts the coal slurry supernatant to the coal slurry water purifier 2. The coagulant supply device 10 and the coagulant aid supply device 11 provide coagulant and coagulant aid respectively, which enter the coal slurry water purifier 2 together with the sludge supernatant, allowing for further flocculation and sedimentation. After filtration by the coal slurry water purifier 2, the clarified water enters the clear water tank 3 for temporary storage, which can be used for backwashing of the coal slurry water purifier and further reused according to the actual situation of the plant.

[0012] This application utilizes a process of collection, sedimentation, coagulation, filtration, and reuse to separate and utilize coal-containing wastewater. It also upgrades or modifies the coal-containing wastewater treatment system to meet the requirements for compliant discharge and reuse.

Claims

1. A small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants, characterized in that: It includes a wastewater tank, a coal slurry water purifier, and a clear water tank. The wastewater tank is equipped with a middle partition to form a sedimentation tank and a regulating tank for coal-containing wastewater. Above the middle partition is an overflow area. The regulating tank is equipped with a booster pump and is connected to the inlet of the coal slurry water purifier through a booster pipeline. The booster pipeline is equipped with a chemical dosing port, which is connected to a coagulant supply device and a coagulant aid supply device. The outlet of the coal slurry water purifier is connected to the clear water tank through an outlet pipeline.

2. The small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants according to claim 1, characterized in that, The clear water tank is equipped with a recycled water pump and connected to a recycled water pipeline.

3. The small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants according to claim 1, characterized in that, The clear water tank is equipped with a backwash water pump, which is connected to the return port of the coal slurry water purifier via a return pipeline.

4. A small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants according to claim 1, characterized in that, The wastewater outlet of the coal slurry water purifier is connected to the coal-containing wastewater sedimentation tank via a wastewater pipeline.

5. A small-scale coal-containing wastewater collection, sedimentation, and reuse system for thermal power plants according to claim 1, characterized in that, Two coal slurry water purifiers are installed.

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