A system for improving the efficiency of domestic sewage treatment in thermal power plants by utilizing hot water from heating stations.

Abstract

This utility model belongs to the field of wastewater treatment technology and relates to a system for improving the efficiency of domestic wastewater treatment in thermal power plants by utilizing hot water from heating stations. This utility model significantly improves the efficiency of domestic wastewater treatment in thermal power plants, including a hot water supply system, a temperature control system, and a wastewater mixing system. The hot water supply system uses stainless steel insulated branch pipes to connect the heating station and the domestic wastewater regulating tank, maximizing the utilization of waste heat from the heating station. The temperature control system monitors the temperature field distribution in the domestic wastewater regulating tank in real time through a distributed temperature sensor network, and achieves precise closed-loop control of wastewater temperature through the linkage of a PLC controller, regulating valves, and intelligent temperature controllers. The wastewater mixing system integrates aeration pipes and swirling nozzles. After the perforated aeration pipes achieve primary distribution of hot water, the swirling nozzles form a three-dimensional heat circulation. Combined with the mechanical disturbance of the agitator, this completely solves the common problems of temperature stratification and uneven mixing in traditional systems.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology and relates to a system for improving the efficiency of domestic wastewater treatment in thermal power plants by utilizing hot water from heating stations. Background Technology

[0002] Wastewater treatment is a crucial aspect of ensuring environmental safety and achieving water resource recycling during the operation of thermal power plants. Currently, wastewater treatment systems in thermal power plants face numerous challenges, particularly in improving treatment efficiency.

[0003] Existing domestic wastewater treatment systems for flue gas reheating in thermal power plants, such as the Chinese patent with publication number CN212799716U, disclose "a domestic wastewater treatment system for flue gas reheating in thermal power plants." This system uses a circulating water pipeline for domestic wastewater treatment connected to the system. A first heat exchanger and a second heat exchanger are sequentially installed on this pipeline. A flue gas water lifting system is installed in the flue gas duct after the desulfurization system of the thermal power plant. The condensate from this flue gas water lifting system enters the first heat exchanger for heat exchange. A gas-liquid heat exchanger is installed inside the chimney, and its circulating water pipeline enters the second heat exchanger for heat exchange. This flue gas reheating system recovers and utilizes the moisture and heat from the high-temperature, humid flue gas of the thermal power plant. The recovered heat is used to reheat the biological domestic wastewater treatment system, and the recovered moisture is used in the desulfurization process. The flue gas reheating system for domestic sewage treatment has defects, which increases the complexity of the process system. Since the primary and secondary heat exchangers are located in the flue and chimney after the desulfurization system, respectively, the flue gas is highly corrosive, and the equipment and pipelines have high requirements for corrosion resistance. This results in high investment, high inspection difficulty, and increases the difficulty of safe and stable operation of the equipment and pipelines in the later stage, as well as the risk to the safe and stable operation of the entire thermal power plant. In addition, since the system does not have a temperature sensor to monitor the domestic sewage temperature in real time, it cannot stably control the domestic sewage temperature, which can easily cause fluctuations in the aquatic environment of microorganisms, which is not conducive to improving the efficiency of domestic sewage treatment. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the prior art and provide a system for improving the efficiency of domestic sewage treatment in thermal power plants by utilizing hot water from heating stations. This system improves the efficiency of domestic sewage treatment and creates a stable growth environment for microbial communities.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a system for improving the efficiency of domestic sewage treatment in thermal power plants by utilizing hot water from heating stations, including a hot water supply system, a temperature control system, and a sewage mixing system;

[0007] The hot water supply system includes multiple stainless steel insulated branch pipes; one end of each stainless steel insulated branch pipe is connected to the hot water pipeline of the heating station, and the other end is connected to the domestic sewage regulating tank; a regulating valve is installed on each stainless steel insulated branch pipe.

[0008] The temperature control system includes a PLC controller, an intelligent temperature controller, and multiple temperature sensors; the multiple temperature sensors are evenly distributed in the domestic sewage equalization tank, and each of the multiple temperature sensors is connected to the PLC controller; the PLC controller is connected to the intelligent temperature controller and the regulating valve respectively; the intelligent temperature controller is installed in the domestic sewage equalization tank.

[0009] The wastewater mixing system is installed in the domestic wastewater regulating tank and includes an aeration pipe, a swirl nozzle, and a stirrer; the swirl nozzle is connected to the aeration pipe and the stainless steel insulated branch pipe; the aeration pipe has multiple perforations evenly distributed on it.

[0010] Preferably, the surface of the stainless steel insulated branch pipe is provided with a polyurethane insulation layer and an aluminum foil protective layer.

[0011] Preferably, a Y-type filter is installed on the stainless steel insulated branch pipe.

[0012] Preferably, the temperature sensor is a PT100 temperature sensor.

[0013] Preferably, the temperature sensor is located at a depth of 50% of the total depth of the domestic sewage regulating tank.

[0014] Preferably, the swirling nozzle is made of 316 stainless steel and its hot water spray angle is 120°.

[0015] Preferably, the arrangement density of the swirl nozzles in the domestic sewage equalization tank is 1 nozzle / 10m². 2 .

[0016] Preferably, the diameter of the perforation is 8 mm; the spacing between adjacent perforations is 200 mm.

[0017] Preferably, it also includes an audible and visual alarm device; the audible and visual alarm device is connected to the PLC controller.

[0018] Preferably, the inner wall of the domestic sewage regulating tank is provided with a heat insulation layer.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] Stainless steel insulated branch pipes maximize the utilization of waste heat from the heating station; temperature sensors monitor the temperature field distribution in the domestic sewage regulating tank in real time, and combined with the linkage regulation of PLC controller, regulating valve and intelligent temperature controller, precise closed-loop control of sewage temperature is achieved, improving the efficiency of domestic sewage treatment and creating a stable growth environment for microbial communities; after the initial distribution of hot water is achieved through perforation, a three-dimensional heat circulation is formed by swirl nozzles, which, together with the mechanical disturbance of the agitator, completely solves the common problems of temperature stratification and uneven mixing in traditional systems. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the system of this utility model.

[0023] The components include: 1. Domestic sewage regulating tank; 2. Hot water pipeline of heating station; 3. Regulating valve; 4. Y-type filter; 5. Aeration pipe; 6. Agitator; 7. Temperature sensor; 8. Swirl nozzle. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings:

[0031] This utility model provides a system for improving the efficiency of domestic sewage treatment in thermal power plants by utilizing hot water from heating stations. Figure 1 As shown, this utility model achieves a significant improvement in the efficiency of domestic sewage treatment in thermal power plants by constructing a hot water supply system, a temperature control system, and a sewage mixing system, with the three operating in a coordinated manner.

[0032] The hot water supply system includes multiple stainless steel insulated branch pipes; one end of the stainless steel insulated branch pipe is connected to the hot water pipeline 2 of the heating station, and the other end is connected to the domestic sewage regulating tank 1; a regulating valve 3 is installed on the stainless steel insulated branch pipe.

[0033] The temperature control system includes a PLC controller, an intelligent temperature controller, and multiple temperature sensors 7; the multiple temperature sensors 7 are evenly distributed in the domestic sewage equalization tank 1, and each of the multiple temperature sensors 7 is connected to the PLC controller; the PLC controller is connected to the intelligent temperature controller and the regulating valve 3 respectively; the intelligent temperature controller is installed in the domestic sewage equalization tank 1.

[0034] The sewage mixing system is set in the domestic sewage equalization tank 1, including aeration pipe 5, swirl nozzle 8 and agitator 6; swirl nozzle 8 is connected to stainless steel insulated branch pipe through aeration pipe 5; multiple perforations are evenly arranged on aeration pipe 5; the diameter of the perforation is 8mm and the spacing between adjacent perforations is 200mm.

[0035] The hot water supply system uses stainless steel insulated branch pipes to connect the heating station and the domestic sewage equalization tank 1. This ensures clean hot water delivery while effectively reducing heat loss through insulation design, maximizing the utilization of waste heat from the heating station. The temperature control system monitors the temperature field distribution within the domestic sewage equalization tank 1 in real time through a distributed temperature sensor network 7. Combined with the coordinated regulation of the PLC controller, regulating valve 3, and intelligent temperature controller, it achieves precise closed-loop control of sewage temperature, creating a stable growth environment for the microbial community. Specifically, the PLC controller receives water temperature data transmitted from the temperature sensors 7, compares it with the preset temperature range suitable for microbial growth, and sends a control signal to the regulating valve 3 based on the comparison result to adjust the hot water flow and maintain the domestic sewage temperature within the appropriate range. Simultaneously, the PLC controller controls the intelligent temperature controller to dynamically adjust the heating or cooling of the tank water according to real-time temperature changes to maintain the temperature within the set range. The wastewater mixing system integrates the aeration pipe 5 with the swirl nozzle 8. After the perforated aeration pipe 5 achieves the initial distribution of hot water, the swirl nozzle 8 forms a three-dimensional heat circulation. Combined with the mechanical disturbance of the agitator 6, it completely solves the common problems of temperature stratification and uneven mixing in traditional systems.

[0036] This utility model system achieves seamless connection of each functional unit through modular design, which greatly reduces energy consumption while ensuring treatment effect. Its intelligent control characteristics significantly reduce the need for manual intervention, making it particularly suitable for long-term stable operation under complex working conditions in thermal power plants. It provides a new high-efficiency and energy-saving solution for the field of industrial wastewater treatment.

[0037] A Y-type filter 4 is installed on the stainless steel insulated branch pipe, with a polyurethane insulation layer and an aluminum foil protective layer on its surface. The Y-type filter 4 effectively intercepts impurities in the hot water of the heating station, preventing pipe blockage and equipment wear, and ensuring long-term stable operation of the system. The polyurethane insulation layer reduces heat loss during hot water transportation, maintains stable hot water temperature, and improves energy efficiency. The outer aluminum foil protective layer not only enhances the durability of the insulation structure and resists external environmental corrosion, but also forms a light-reflecting surface to further reduce radiative heat loss. In addition, the diameter of the stainless steel insulated branch pipe is designed according to the hot water flow rate of the heating station and the heat required by the domestic sewage regulating tank 1, ensuring an adequate supply of hot water.

[0038] Temperature sensor 7 is a PT100 temperature sensor, characterized by high measurement accuracy, good stability, and strong anti-interference capability. Furthermore, the excellent corrosion resistance of the PT100 temperature sensor makes it particularly suitable for wastewater treatment environments, ensuring the accuracy of long-term monitoring and the stability of system operation. Temperature sensor 7 is located at 50% of the total water depth of the domestic wastewater equalization tank 1, accurately reflecting the temperature distribution within the tank and avoiding measurement deviations caused by environmental influences on surface temperature or interference from sediment at the bottom layer.

[0039] The swirl nozzle 8 is made of 316 stainless steel, making it suitable for corrosive media such as chloride ions and hydrogen sulfide present in wastewater treatment environments. The hot water jet angle of the swirl nozzle 8 is 120°, creating a three-dimensional swirling field. This ensures thorough mixing of hot water and wastewater while preventing localized overheating that could damage the microbial community, achieving efficient and uniform heat distribution. The swirl nozzle 8 is arranged at a density of 1 nozzle per 10m² in the domestic wastewater equalization tank 1. 2 This approach optimizes equipment investment costs while ensuring uniform temperature throughout the pool, preventing heat waste and ensuring the overall thermal balance of the wastewater treatment system.

[0040] This utility model system also includes an audible and visual alarm device; the audible and visual alarm device is connected to the PLC controller. When the temperature control system detects an abnormal water temperature, it can trigger the audible and visual alarm device to provide an intuitive and visual alarm of the abnormal state, facilitating timely maintenance by operation and maintenance personnel.

[0041] The inner wall of the domestic sewage equalization tank 1 is equipped with an insulation layer, which effectively reduces heat exchange between the tank and the external environment, significantly reduces heat loss, and keeps the sewage temperature stable. At the same time, it avoids changes in the water temperature inside the tank caused by fluctuations in the external temperature, providing a constant growth environment for the microbial community and ensuring the stability of biological treatment efficiency.

[0042] In one embodiment of this utility model, when the temperature sensor 7 detects that the water temperature exceeds a preset value ±1℃, the PLC controller adjusts the opening of the regulating valve 3; when the temperature sensor 7 detects that the water temperature exceeds a preset value ±3℃, the PLC controller triggers an audible and visual alarm and adjusts the opening of the regulating valve 3; when the temperature sensor 7 detects that the water temperature exceeds a preset value ±5℃, the PLC controller closes the regulating valve 3, cutting off the hot water supply. Simultaneously, when the operator detects an abnormality, they can also manually adjust the opening of the regulating valve 3 or directly close the regulating valve 3.

[0043] This embodiment significantly improves the system's reliability and operational flexibility by employing a multi-layered safety protection mechanism that combines a three-level temperature gradient control strategy with manual intervention. The PLC controller adopts progressive response measures based on the degree of water temperature deviation, avoiding the impact of frequent start-stop cycles on the equipment and effectively preventing damage to the microbial system from temperature runaway. Simultaneously, the retained manual operation permissions provide emergency handling methods for special situations, ensuring automated operation of the system under normal conditions while providing dual protection against emergencies. This ensures both effective wastewater treatment and enhanced safety and operational fault tolerance.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A system for improving the efficiency of domestic sewage treatment in a thermal power plant by utilizing hot water from a heating station, characterized in that, This includes a hot water supply system, a temperature control system, and a wastewater mixing system; The hot water supply system includes multiple stainless steel insulated branch pipes; one end of the stainless steel insulated branch pipe is connected to the hot water pipeline (2) of the heating station, and the other end is connected to the domestic sewage regulating tank (1); a regulating valve (3) is installed on the stainless steel insulated branch pipe. The temperature control system includes a PLC controller, an intelligent temperature controller, and multiple temperature sensors (7); the multiple temperature sensors (7) are evenly distributed in the domestic sewage regulating tank (1), and the multiple temperature sensors (7) are all connected to the PLC controller; the PLC controller is connected to the intelligent temperature controller and the regulating valve (3) respectively; the intelligent temperature controller is installed in the domestic sewage regulating tank (1); The sewage mixing system is installed in the domestic sewage regulating tank (1) and includes an aeration pipe (5), a swirl nozzle (8) and a stirrer (6); the swirl nozzle (8) is connected to the stainless steel heat-insulated branch pipe through the aeration pipe (5); the aeration pipe (5) is evenly provided with multiple perforations.

2. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... The surface of the stainless steel insulated branch pipe is provided with a polyurethane insulation layer and an aluminum foil protective layer.

3. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... A Y-type filter (4) is installed on the stainless steel insulated branch pipe.

4. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... The temperature sensor (7) is a PT100 temperature sensor.

5. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... The temperature sensor (7) is located at 50% of the total depth of the domestic sewage regulating tank (1).

6. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... The swirling nozzle (8) is made of 316 stainless steel and has a hot water spray angle of 120°.

7. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... The swirl nozzles (8) are arranged at a density of 1 per 10m³ in the domestic sewage equalization tank (1). 2 .

8. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... The diameter of the perforation is 8mm; the distance between adjacent perforations is 200mm.

9. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station, as described in claim 1, is characterized in that... It also includes an audible and visual alarm device; the audible and visual alarm device is connected to the PLC controller.

10. A system for improving the efficiency of domestic sewage treatment in a thermal power plant using hot water from a heating station according to claim 1, characterized in that, The inner wall of the domestic sewage regulating tank (1) is provided with a heat insulation layer.

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