Power plant desulfurization wastewater treatment equipment based on dynamic changes of unit load

Abstract

The utility model relates to waste water treatment equipment technical field discloses power plant desulfurization waste water treatment equipment based on unit load dynamic change, including power plant, drying system, waste water storage tank and PLC controller, the input of waste water storage tank is fixedly provided with low temperature flash evaporation concentration device, the inside of waste water storage tank is provided with liquid level sensor and concentration detector, one side of waste water storage tank is fixedly provided with spray water pump, the output of spray water pump is fixedly provided with flow sensor, the inside installation of drying system has data acquisition module. In the utility model, through power plant, PLC controller, liquid level sensor, concentration detector, waste water storage tank, flow sensor, spray water pump, data acquisition module, drying system and low temperature flash evaporation concentration device, thereby solve the system lack of dynamic perception and accurate control mechanism in prior art, difficult to adapt to the problem of frequent fluctuation of load working condition.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, and in particular to power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load. Background Technology

[0002] Desulfurization wastewater treatment equipment is a key environmental protection device in the wet desulfurization process of power plants. It is mainly used to purify wastewater with high salinity, high turbidity, and heavy metal ion content generated during the desulfurization process to meet zero discharge or emission standards. In existing desulfurization wastewater treatment systems, when the unit is not operating at full load, changes in air preheater resistance lead to insufficient bypass flue gas volume, and the wastewater and flue gas volumes are mismatched, causing the evaporation output to fail to meet design requirements.

[0003] A search revealed Chinese Patent Publication No. CN219546746U, which discloses a desulfurization wastewater drying system, belonging to the field of desulfurization wastewater drying technology. The system includes a wastewater storage tank, a rotary spray drying tower, a first flue, a second flue, a third flue, an air preheater, and an electrostatic precipitator. The wastewater storage tank is connected to the rotary spray drying tower, which is connected to the air preheater via the first flue, the electrostatic precipitator via the second flue, and the electrostatic precipitator via the third flue. A cyclone dust collector and a wear-resistant booster fan are installed on the third flue. When the coal-fired power plant unit is operating at high load, the dried wastewater flue gas directly enters the electrostatic precipitator. When the coal-fired power plant unit is operating at low load, the dried wastewater flue gas passes through the cyclone dust collector, enters the wear-resistant booster fan, and then enters the electrostatic precipitator. This effectively solves the problems of clogging and inability to operate at low loads in existing desulfurization wastewater drying systems, and improves the operating efficiency of the rotary spray drying tower.

[0004] The aforementioned system increases flue gas pressure using a wear-resistant booster fan to ensure flue gas delivery volume, thereby guaranteeing the operating efficiency of the rotary spray drying tower. However, this system lacks dynamic sensing and precise control mechanisms, making it difficult to adapt to operating conditions with frequent load fluctuations. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a power plant desulfurization wastewater treatment device based on dynamic changes in unit load, aiming to solve the problem that the existing system lacks dynamic sensing and precise control mechanisms, making it difficult to adapt to frequent load fluctuations.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a power plant desulfurization wastewater treatment device based on dynamic changes in unit load, comprising a power plant, a drying system, a wastewater storage tank, and a PLC controller. A low-temperature flash evaporation concentration device is fixedly installed at the input end of the wastewater storage tank. A level sensor and a concentration detector are installed inside the wastewater storage tank. A spray water pump is fixedly installed on one side of the wastewater storage tank. The output end of the spray water pump is fixedly installed on one side of the drying system. A flow sensor is fixedly installed at the output end of the spray water pump. One side of the power plant is connected to the other side of the drying system. A data acquisition module is installed inside the drying system. The PLC controller is electrically connected to the power plant, the spray water pump, the drying system, the level sensor, the concentration detector, the flow sensor, and the data acquisition module.

[0007] The above technical solution, which transmits data to a PLC controller via a power plant, level sensor, concentration detector, flow sensor, and data acquisition module, and then controls the spray water pump and drying system through the PLC controller, solves the problem of existing systems lacking dynamic sensing and precise control mechanisms and being unable to adapt to frequent load fluctuations.

[0008] Preferably, the data acquisition module includes a temperature sensor, a humidity sensor, and multiple pressure sensors, all of which are installed inside the drying system. The PLC controller is electrically connected to the temperature sensor, humidity sensor, and multiple pressure sensors.

[0009] Preferably, the drying system includes a front main flue, one end of which is fixedly installed on one side of the power plant, and an air preheater is fixedly installed at the other end of the front main flue. A rear main flue is fixedly installed at the output end of the air preheater. A dust collector is fixedly installed at the end of the rear main flue away from the air preheater. A bypass high-temperature flue is fixedly installed on the outer wall of the front main flue. A drying tower is fixedly installed at the end of the bypass high-temperature flue away from the front main flue. A low-temperature flue is fixedly installed on one side of the drying tower. The end of the low-temperature flue away from the drying tower and the end of the rear main flue away from the air preheater are connected in parallel to the input end of the dust collector. Multiple pressure sensors are respectively installed at both ends of the air preheater. A temperature sensor is installed at the inlet of the drying tower. A humidity sensor is installed at the outlet of the drying tower. The PLC controller is electrically connected to the dust collector.

[0010] Preferably, a low-temperature booster flue is fixedly installed on one side of the dust collector, and the end of the low-temperature booster flue away from the dust collector is fixedly installed on the outer wall of the rear main flue. A variable frequency booster fan is installed on the low-temperature booster flue, and the PLC controller is electrically connected to the variable frequency booster fan.

[0011] Preferably, the drying tower is equipped with an atomizer, the output end of the spray water pump is fixedly located on one side of the atomizer, and the PLC controller is electrically connected to the atomizer.

[0012] Preferably, each of the bypass high-temperature flue, the rear main flue, the low-temperature flue, and the low-temperature pressurization flue is equipped with an electric regulating door, which is electrically connected to the PLC controller.

[0013] Preferably, the electric regulating door on the low-temperature booster flue is installed between the variable frequency booster fan and the rear main flue.

[0014] Preferably, the electric regulating door on the rear main flue is installed between the low-temperature pressurization flue and the low-temperature flue.

[0015] This utility model has the following beneficial effects: 1. In this utility model, the power plant feeds back its own operating status to the PLC controller, the liquid level sensor and concentration detector monitor the data of the wastewater storage tank in real time, the flow sensor monitors the flow rate at the output end of the spray water pump in real time, and the data acquisition module monitors the operating parameters of the drying system and cooperates with the low temperature flash evaporation and concentration device. This solves the problem that the existing system lacks dynamic perception and precise control mechanism and is difficult to adapt to the frequent load fluctuation conditions.

[0016] 2. In this utility model, the pressure sensor monitors the pressure at both ends of the air preheater in real time, and the temperature and humidity sensors monitor the temperature and humidity inside the drying tower in real time, thereby realizing the data acquisition module. The PLC controller controls and adjusts the variable frequency booster fan, dust collector, and spray water pump. Through the coordination of the electric regulating door, bypass high-temperature flue, front main flue, rear main flue, low-temperature booster flue, and low-temperature flue, dynamic perception and precise control of the drying system are achieved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structural process of the power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load proposed in this utility model. Figure 2 This is a schematic diagram of the drying system of the power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load proposed in this utility model. Figure 3 This is a three-dimensional schematic diagram of the power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load proposed in this utility model. Figure 4 This is a schematic diagram of the data acquisition module architecture of the power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load proposed in this utility model.

[0018] Legend: 1. Low-temperature flash evaporation and concentration unit; 2. Drying system; 3. Drying tower; 4. Electric regulating valve; 5. Bypass high-temperature flue; 6. Power plant; 7. Front main flue; 8. Air preheater; 9. Rear main flue; 10. Variable frequency booster fan; 11. Low-temperature booster flue; 12. Dust collector; 13. Low-temperature flue; 14. Spray water pump; 15. Wastewater storage tank. Detailed Implementation

[0019] 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. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] Reference Figure 1 , Figure 3 and Figure 4 This utility model provides an embodiment of a power plant desulfurization wastewater treatment device based on dynamic changes in unit load. The device includes a power plant 6, a drying system 2, a wastewater storage tank 15, and a PLC controller. A low-temperature flash evaporation concentration device 1 is fixedly installed at the input end of the wastewater storage tank 15. A level sensor and a concentration detector are installed inside the wastewater storage tank 15. A spray water pump 14 is fixedly installed on one side of the wastewater storage tank 15. The output end of the spray water pump 14 is fixedly installed on one side of the drying system 2, and a flow sensor is fixedly installed at the output end of the spray water pump 14. One side of the power plant 6 is connected to the other side of the drying system 2. A data acquisition module is installed inside the drying system 2. The PLC controller is electrically connected to the power plant 6, the spray water pump 14, the drying system 2, the level sensor, the concentration detector, the flow sensor, and the data acquisition module.

[0021] Specifically, the low-temperature flash evaporation concentration device 1 utilizes the principle that "the boiling point of a substance decreases as pressure decreases" to achieve efficient concentration and volume reduction of desulfurization wastewater, which is an existing technology. When using this equipment to treat desulfurization wastewater, the low-temperature flash evaporation concentration device 1 efficiently concentrates and reduces the volume of desulfurization wastewater, which is then stored in the wastewater storage tank 15. The concentration of wastewater in the wastewater storage tank 15 is monitored in real time by a concentration detector, and the data is transmitted to the PLC controller for processing and analysis. Combined with the remaining volume detected by the liquid level sensor, the PLC controller controls the power adjustment of the spray water pump 14, and through real-time feedback from the flow sensor, the wastewater in the wastewater storage tank 15 is drawn into the drying system 2 at a preset flow rate, and evaporated in the drying system 2 in conjunction with the high-temperature flue gas from the power plant 6.

[0022] The system collects the operating parameters and status data of the drying system 2 in real time through the data acquisition module. When the load of the power plant 6 changes, the PLC controller controls the wastewater treatment efficiency of the drying system 2 and adjusts the power of the spray water pump 14 to match the load changes of the power plant 6. This solves the problem that the existing system lacks dynamic perception and precise control mechanism and is difficult to adapt to the frequent load fluctuation conditions.

[0023] Reference Figure 3 and Figure 4 The data acquisition module includes a temperature sensor, a humidity sensor, and multiple pressure sensors. The temperature sensor, humidity sensor, and multiple pressure sensors are all installed inside the drying system 2. The PLC controller is electrically connected to the temperature sensor, humidity sensor, and multiple pressure sensors.

[0024] Specifically, the drying system 2's operating status and data are collected in real time through temperature sensors, humidity sensors, and multiple pressure sensors, and the signals are fed back to the PLC controller for processing and analysis, thus realizing the data acquisition module's function of collecting data.

[0025] Reference Figure 1 , Figure 2 and Figure 3 The drying system 2 includes a front main flue 7, one end of which is fixedly installed on one side of the power plant 6, and an air preheater 8 is fixedly installed at the other end of the front main flue 7. A rear main flue 9 is fixedly installed at the output end of the air preheater 8. A dust collector 12 is fixedly installed at the end of the rear main flue 9 away from the air preheater 8. A bypass high-temperature flue 5 is fixedly installed on the outer wall of the front main flue 7. A drying tower 3 is fixedly installed at the end of the bypass high-temperature flue 5 away from the front main flue 7. A low-temperature flue 13 is fixedly installed on one side of the drying tower 3. The end of the low-temperature flue 13 away from the drying tower 3 and the end of the rear main flue 9 away from the air preheater 8 are connected in parallel to the input end of the dust collector 12. Multiple pressure sensors are installed at both ends of the air preheater 8. A temperature sensor is installed at the inlet of the drying tower 3. A humidity sensor is installed at the outlet of the drying tower 3. A PLC controller is electrically connected to the dust collector 12.

[0026] Specifically, the dust collector 12 feeds back its operating status to the PLC controller. When the power plant 6 is operating at full load, the resistance of the air preheater 8 is the same as the resistance in the bypass high-temperature flue duct 5. The high-temperature flue gas is output to the front main flue duct 7 through the power plant 6 and is divided into two parts. One part is converted by the heat of the air preheater 8 and then enters the dust collector 12 through the rear main flue duct 9 for dust removal. The other part enters the drying tower 3 through the bypass high-temperature flue duct 5 to evaporate the wastewater. The evaporated low-temperature flue gas enters the dust collector 12 through the low-temperature flue duct 13 for dust removal. During this period, the operating power of the dust collector 12 is controlled by the PLC controller, and the feedback of the dust collector 12's own status to the PLC controller determines whether the dust collector 12 is operating abnormally. Thus, the function of the drying system 2 in treating wastewater is realized when the power plant 6 is operating at full load.

[0027] Reference Figure 1 , Figure 2 and Figure 3 A low-temperature booster flue 11 is fixedly installed on one side of the dust collector 12. The end of the low-temperature booster flue 11 away from the dust collector 12 is fixedly installed on the outer wall of the rear main flue 9. A variable frequency booster fan 10 is installed on the low-temperature booster flue 11. The PLC controller is electrically connected to the variable frequency booster fan 10.

[0028] Specifically, the variable frequency booster fan 10 feeds back its status to the PLC controller. When the power plant 6 is operating at low load or with fluctuating load, the resistance of the air preheater 8 decreases, and the high-temperature flue gas in the main flue 7 tends to flow into the air preheater 8, making it impossible for the wastewater treatment in the drying tower 3 to achieve the preset effect.

[0029] At this time, the power plant 6 transmits its own operating status data to the PLC controller for processing and analysis. On the other hand, the pressure sensors at both ends of the air preheater 8 transmit the real-time measurement results to the PLC controller for processing and analysis. The PLC controller controls the variable frequency booster fan 10 to start and reach the preset power, pressurizing the low-temperature flue gas after dust removal in the low-temperature booster flue 11 and inputting it into the rear main flue 9, increasing the pressure in the rear main flue 9, so that the pressure in the rear main flue 9 and the pressure in the bypass high-temperature flue 5 are maintained within the preset range. This allows the high-temperature flue gas in the front main flue 7 to enter the bypass high-temperature flue 5 normally, maintaining the pressure in the bypass high-temperature flue 5, so that the drying tower 3 can efficiently evaporate wastewater.

[0030] On the other hand, the temperature of the high-temperature flue gas in the bypass high-temperature flue duct 5 is measured in real time by the temperature sensor at the flue gas inlet inside the drying tower 3. When the temperature fluctuates, the PLC controller controls and adjusts the power of the spray water pump 14 so that the wastewater in the drying tower 3 matches the current temperature in real time. The humidity is measured by the humidity sensor at the flue gas outlet of the drying tower 3 to provide real-time feedback on the wastewater treatment efficiency, thereby achieving continuous and efficient wastewater treatment function.

[0031] Reference Figure 2 and Figure 3 The drying tower 3 is equipped with an atomizer. The output end of the spray water pump 14 is fixedly installed on one side of the atomizer. The PLC controller is electrically connected to the atomizer.

[0032] Specifically, the atomizer feeds back its operating status to the PLC controller, which then controls the power of the atomizer to improve the atomization efficiency of the wastewater and thus enhance the wastewater treatment efficiency.

[0033] Reference Figure 1 and Figure 3 Electric regulating doors 4 are installed on the bypass high-temperature flue 5, the rear main flue 9, the low-temperature flue 13, and the low-temperature pressurization flue 11. The electric regulating doors 4 are electrically connected to the PLC controller.

[0034] Specifically, the electric regulating gate 4 feeds back its operating status to the PLC controller. The PLC controller controls the adjustment of the electric regulating gate 4, which in turn controls the flow rate of flue gas in the bypass high-temperature flue 5, the main flue 9, the low-temperature flue 13, and the low-temperature pressurized flue 11. This allows for intelligent adaptation to the treatment of wastewater with different flow rates and concentrations when the power plant 6 experiences load fluctuations.

[0035] Reference Figure 2 The electric regulating door 4 on the low-temperature booster flue 11 is installed between the variable frequency booster fan 10 and the rear main flue 9.

[0036] Specifically, by designing the position of the electric regulating door 4 on the low-temperature booster flue 11, when the power plant 6 is operating at a low load, the electric regulating door 4 can be opened to allow the boosted low-temperature flue gas to enter the rear main flue 9 to balance the pressure at both ends of the rear main flue 9, thereby helping to realize the intelligent control function of the equipment.

[0037] Reference Figure 2 The electric regulating door 4 on the rear main flue 9 is installed between the low-temperature pressurized flue 11 and the low-temperature flue 13.

[0038] Specifically, the electric regulating door 4 on the rear main flue 9 allows for simultaneous control of the flow rate of low-temperature flue gas flowing from the low-temperature booster flue 11 and the rear main flue 9 to the dust collector 12, reducing fluctuations when low-temperature flue gas merges into the low-temperature flue 13, thereby helping to improve the stability of low-temperature flue gas treatment.

[0039] Working principle: The desulfurization wastewater is efficiently concentrated and reduced in volume by the low-temperature flash concentration device 1, and then stored in the wastewater storage tank 15. The wastewater is then pumped into the drying tower 3 for atomization by the spray water pump 14. When the power plant 6 is operating at low load or with frequent load fluctuations, the pressure sensors at both ends of the air preheater 8 transmit the real-time measurement results to the PLC controller for processing and analysis. The PLC controller controls the variable frequency booster fan 10 to start and reach the preset power, pressurizing the low-temperature flue gas after dust removal in the low-temperature booster flue 11 and inputting it into the rear main flue 9, increasing the pressure in the rear main flue 9. This keeps the pressure in the rear main flue 9 and the bypass high-temperature flue 5 within the preset range, thereby allowing the high-temperature flue gas in the front main flue 7 to enter the bypass high-temperature flue 5 normally, maintaining the pressure in the bypass high-temperature flue 5, so that the drying tower 3 can efficiently evaporate the wastewater.

[0040] The temperature of the high-temperature flue gas in the bypass high-temperature flue duct 5 is measured in real time by a temperature sensor at the flue gas inlet inside the drying tower 3. When the temperature fluctuates, the PLC controller controls and adjusts the power of the spray water pump 14 by combining the measurement of wastewater concentration by the concentration detector, the measurement of wastewater balance by the liquid level sensor, and the feedback of the output flow of the spray water pump 14 by the flow sensor. This ensures that the wastewater in the drying tower 3 matches the current temperature in real time. The humidity is measured by the humidity sensor at the flue gas outlet of the drying tower 3, and the wastewater treatment efficiency is fed back in real time. This solves the problem that the existing system lacks dynamic perception and precise control mechanism and is difficult to adapt to frequent load fluctuations.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power plant desulfurization wastewater treatment device based on dynamic changes in unit load, comprising a power plant (6), a drying system (2), a wastewater storage tank (15), and a PLC controller, characterized in that: The input end of the wastewater storage tank (15) is fixedly equipped with a low-temperature flash evaporation concentration device (1). The wastewater storage tank (15) is equipped with a liquid level sensor and a concentration detector. A spray water pump (14) is fixedly installed on one side of the wastewater storage tank (15). The output end of the spray water pump (14) is fixedly installed on one side of the drying system (2). A flow sensor is fixedly installed on the output end of the spray water pump (14). One side of the power plant (6) is connected to the other side of the drying system (2). A data acquisition module is installed inside the drying system (2). The PLC controller is electrically connected to the power plant (6), the spray water pump (14), the drying system (2), the liquid level sensor, the concentration detector, the flow sensor, and the data acquisition module.

2. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 1, characterized in that: The data acquisition module includes a temperature sensor, a humidity sensor and multiple pressure sensors. The temperature sensor, humidity sensor and multiple pressure sensors are all installed inside the drying system (2). The PLC controller is electrically connected to the temperature sensor, humidity sensor and multiple pressure sensors.

3. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 2, characterized in that: The drying system (2) includes a front main flue (7), one end of which is fixedly installed on one side of the power plant (6), and the other end of which is fixedly installed with an air preheater (8). The output end of the air preheater (8) is fixedly installed with a rear main flue (9). The end of the rear main flue (9) away from the air preheater (8) is fixedly installed with a dust collector (12). The outer wall of the front main flue (7) is fixedly installed with a bypass high-temperature flue (5). The end of the bypass high-temperature flue (5) away from the front main flue (7) is fixedly installed with a bypass high-temperature flue (5). A drying tower (3) is fixedly installed, and a low-temperature flue (13) is fixedly installed on one side of the drying tower (3). The end of the low-temperature flue (13) away from the drying tower (3) and the end of the rear main flue (9) away from the air preheater (8) are connected in parallel to the input end of the dust collector (12). Multiple pressure sensors are respectively installed at both ends of the air preheater (8). The temperature sensor is installed at the inlet of the drying tower (3). The humidity sensor is installed at the outlet of the drying tower (3). The PLC controller is electrically connected to the dust collector (12).

4. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 3, characterized in that: A low-temperature booster flue (11) is fixedly installed on one side of the dust collector (12). The end of the low-temperature booster flue (11) away from the dust collector (12) is fixedly installed on the outer wall of the rear main flue (9). A variable frequency booster fan (10) is installed on the low-temperature booster flue (11). The PLC controller is electrically connected to the variable frequency booster fan (10).

5. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 3, characterized in that: The drying tower (3) is equipped with an atomizer inside, the output end of the spray water pump (14) is fixedly installed on one side of the atomizer, and the PLC controller is electrically connected to the atomizer.

6. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 3, characterized in that: Electric regulating doors (4) are installed on the bypass high-temperature flue (5), the rear main flue (9), the low-temperature flue (13) and the low-temperature pressurization flue (11), and the electric regulating doors (4) are electrically connected to the PLC controller.

7. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 6, characterized in that: The electric regulating door (4) on the low-temperature booster flue (11) is installed between the variable frequency booster fan (10) and the rear main flue (9).

8. The power plant desulfurization wastewater treatment equipment based on dynamic changes in unit load according to claim 6, characterized in that: The electric regulating door (4) on the rear main flue (9) is installed between the low-temperature pressurized flue (11) and the low-temperature flue (13).

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