Wastewater concentration system based on supergravity device

Abstract

The utility model discloses a waste water concentration system based on a supergravity device, which comprises the supergravity device, a fan, a circulating pump, a waste water heater and a circulating box, a gas phase inlet of the supergravity device is connected with the fan through a pipeline, a gas inlet of the fan is directly communicated with the atmosphere, and a liquid phase outlet of the supergravity device is connected with the circulating box through a pipeline. A liquid outlet of the circulating box is connected with a liquid phase inlet of a supergravity device through a circulating pump and a wastewater heater in sequence by a pipeline, and a gas phase outlet of the supergravity device discharges gas carrying water vapor; wherein the inlet of the circulating box is connected with a water replenishing pipeline for replenishing wastewater, and the circulating box is also provided with a liquid level meter for monitoring the liquid level height of the wastewater. The waste water concentration system based on the supergravity device is automatically controlled, the operation effect of the concentration system is guaranteed, and the system is easy to control and operates stably.

Description

Technical Field

[0001] This application belongs to the field of water treatment control technology, specifically relating to a wastewater concentration system based on a hypergravity device. Background Technology

[0002] The principle of the flue gas thickening tower process is to extract low-temperature flue gas before desulfurization and evaporate and concentrate the wastewater. The wastewater is pumped to the thickening tower and continuously atomized by spraying at the top of the tower via a circulating pump. Part of the raw flue gas from the desulfurization tower is drawn from the flue between the induced draft fan and the desulfurization tower, pressurized by a booster fan, and then enters the thickening tower. Inside the thickening tower, the flue gas contacts the atomized circulating slurry, evaporating the water in the slurry. The flue gas and evaporated water are then de-liquidated by a demister and connected to the flue before the desulfurization absorption tower, entering the desulfurization system. The circulating slurry is continuously thickened, significantly reducing the wastewater volume. When the solid content of the slurry reaches a certain concentration, it is transported to a conditioning tank, where it is conditioned and then sent to the terminal drying system.

[0003] Wastewater evaporation requires a large amount of heat. The larger the evaporation capacity of the concentration tower, the larger the volume of hot flue gas extracted, and the larger the scale of the concentration tower equipment and the power of the booster fan, resulting in higher equipment investment and operating costs. Between hot water and hot flue gas, as heat sources carrying the same amount of heat, due to differences in density and specific heat, the power of the pump transporting hot water is much smaller than that of the fan transporting hot flue gas.

[0004] A wastewater concentration system based on a hypergravity device utilizes the principle of air-borne humidification, employing water or steam as a heat source. The hypergravity device enhances gas-liquid mass and heat transfer, achieving wastewater concentration and volume reduction. While Chinese patent CN220951265U discloses a wastewater concentration system based on a hypergravity device, it lacks a reasonable control system and does not address how to replenish fresh wastewater or discharge concentrated wastewater. Summary of the Invention

[0005] In view of the above-mentioned technical problems in the existing technology, the purpose of this application is to provide a wastewater concentration system based on a supergravity device.

[0006] The following technical solution is adopted in this application:

[0007] A wastewater concentration system based on a hypergravity device includes a hypergravity device, a blower, a circulating pump, a wastewater heater, and a circulating tank. The gas phase inlet of the hypergravity device is connected to the blower by a pipeline, and the air inlet of the blower is directly open to the atmosphere. The liquid phase outlet of the hypergravity device is connected to the circulating tank by a pipeline. The liquid outlet of the circulating tank is then connected to the liquid phase inlet of the hypergravity device by a pipeline through the circulating pump and the wastewater heater. The gas phase outlet of the hypergravity device discharges gas carrying water vapor.

[0008] The circulation tank has a water supply pipe connected to its inlet for replenishing wastewater, and a level gauge is also installed on the circulation tank to monitor the wastewater level.

[0009] Furthermore, it also includes an elevated tank containing wastewater. The outlet of the elevated tank is connected to the inlet of the circulation tank via the water replenishment pipeline. An automatic water replenishment control valve is installed on the water replenishment pipeline. The automatic water replenishment control valve and the level gauge are interlocked and controlled by a PLC control system. The level gauge is connected to the automatic water replenishment control valve via the PLC control system, feeding back the monitored level data to the PLC control system. When the level data monitored by the level gauge is lower than the set value, the PLC control system controls the automatic water replenishment control valve to open and replenish wastewater into the circulation tank. When the level data monitored by the level gauge is higher than the set value, the PLC control system controls the automatic water replenishment control valve to close and stop replenishing wastewater.

[0010] Furthermore, the liquid level gauge can have upper and lower limit values ​​for better automated control. When the liquid level in the circulation tank is lower than the lower limit, the automatic water replenishment valve opens to add wastewater to the circulation tank, causing the liquid level to rise continuously. When the liquid level in the circulation tank is higher than the upper limit, the automatic water replenishment valve closes to stop adding wastewater to the circulation tank.

[0011] Furthermore, the wastewater pump outlet pipe is equipped with an external discharge bypass connected to the inlet of the terminal drying system, and an automatic control valve for the external discharge pipeline is installed on the external discharge bypass.

[0012] Furthermore, a conductivity analyzer is installed on the outlet pipe of the circulating pump, and an automatic control valve for the circulating pipeline is installed on the inlet pipe of the wastewater heater. The conductivity analyzer, the automatic control valve for the circulating pipeline, and the automatic control valve for the discharge pipeline are interlocked and controlled by a PLC control system. When the wastewater conductivity data monitored by the conductivity analyzer is lower than the set value, the PLC control system controls the automatic control valve for the circulating pipeline to open and the automatic control valve for the discharge pipeline to close. When the wastewater conductivity data monitored by the conductivity analyzer is higher than the set value, the PLC control system controls the automatic control valve for the discharge pipeline to open and the automatic control valve for the circulating pipeline to close, discharging concentrated wastewater into the terminal drying system.

[0013] Furthermore, the conductivity analyzer can have an upper and lower limit for conductivity settings to facilitate better automated control. When the conductivity of the wastewater at the circulating pump outlet is higher than the upper limit, the automatic control valve of the discharge pipeline opens and the automatic control valve of the circulating pipeline closes, discharging concentrated wastewater into the terminal drying system. At this time, as the liquid level in the circulating tank gradually decreases until it falls below the lower limit, wastewater is added to the circulating tank, causing the liquid level to rise continuously. The wastewater is gradually diluted, the salt concentration in the wastewater decreases, and the conductivity of the wastewater at the circulating pump outlet also gradually decreases until it falls below the lower limit. When the conductivity analyzer detects that the conductivity of the wastewater at the outlet of the circulating pump is lower than the lower limit of conductivity, it controls the automatic control valve of the circulating pipeline to open and the automatic control valve of the discharge pipeline to close, stopping the discharge of concentrated wastewater to the terminal drying system. The wastewater at the outlet of the circulating pump then re-enters the wastewater heater and the supergravity device for concentration.

[0014] Furthermore, a circulation pipeline regulating valve is installed on the outlet pipeline of the circulation pump.

[0015] Furthermore, the wastewater heater is a horizontal shell-and-tube heat exchanger that uses hot water as a heat source.

[0016] Furthermore, the wastewater heater has a hot channel on the tube side and a cold channel on the shell side. The outlet of the circulation tank is connected to the liquid inlet of the hypergravity device via a pipeline through a circulation pump and the cold channel on the shell side of the wastewater heater. A hot medium water inlet pipe and a hot medium water outlet pipe are connected to the hot channel on the tube side of the wastewater heater. A hot medium water regulating valve is installed on the hot medium water inlet pipe.

[0017] Furthermore, the gas phase outlet of the supergravity device is connected to the desulfurization inlet flue of the desulfurization absorption tower.

[0018] This application presents an operation control method for a wastewater concentration system based on a centrifugal device, comprising the following steps:

[0019] 1) Control the airflow by adjusting the fan frequency;

[0020] 2) The wastewater circulation flow rate is controlled by adjusting the opening of the regulating valve in the circulation pipeline at the outlet of the circulation pump;

[0021] 3) Adjust the appropriate rotation speed of the hypergravity device according to the gas-liquid ratio of the material introduced into the hypergravity device;

[0022] 4) Adjust the flow rate of the heat transfer medium in the wastewater heater, thereby controlling the heating temperature of the wastewater in the cold channel of the wastewater heater;

[0023] 5) Based on the real-time feedback from the conductivity analyzer at the outlet of the circulating pump, when the conductivity exceeds the upper limit, the automatic control valve of the circulating pipeline will be automatically closed and the automatic control valve of the discharge pipeline will be opened; when the conductivity is lower than the lower limit, the automatic control valve of the discharge pipeline will be automatically closed and the automatic control valve of the circulating pipeline will be opened.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] This application realizes the automatic control of a wastewater concentration system based on a supergravity device, ensuring the operation effect of the concentration system, and the system is easy to control and operates stably. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the wastewater concentration system based on a hypergravity device in this application;

[0027] Figure 1 In the middle: 1-Supergravity device, 2-Fan, 3-Circulation pump, 4-Circulation pipeline regulating valve, 5-Wastewater heater, 6-Circulation tank, 7-Make-up water automatic control valve, 8-Heat medium water regulating valve, 9-Circulation pipeline automatic control valve, 10-Outlet discharge pipeline automatic control valve. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0029] The present invention adopts the following technical solution: a wastewater concentration control system based on a hypergravity device, including a hypergravity device 1, a blower 2, a circulation pump 3, a circulation pipeline regulating valve 4, a wastewater heater 5, and a circulation tank 6.

[0030] The fan 2 is connected to the gas phase inlet of the supergravity device 1, the air inlet of the fan 2 is directly open to the atmosphere, and the gas phase outlet of the supergravity device 1 is connected to the desulfurization inlet flue of the desulfurization absorption tower.

[0031] The outlet of the circulation tank 6 is connected to the inlet of the circulation pump 3 by a pipeline. A circulation pipeline regulating valve 4 is installed on the outlet pipeline of the circulation pump 3 and is connected to the wastewater inlet of the wastewater heater 5. The wastewater outlet of the wastewater heater 5 is connected to the liquid phase inlet of the hypergravity device 1, and the liquid phase outlet of the hypergravity device 1 is connected to the inlet of the circulation tank 6.

[0032] The circulation tank 6 has a wastewater replenishment pipeline at its inlet, and an automatic replenishment control valve 7 is installed on the pipeline. The automatic replenishment control valve 7 is interlocked with the level gauge via a PLC control system. The level gauge has upper and lower limit settings. The wastewater volume at the upper limit is 80% of the circulation tank 6's volume, and the wastewater volume at the lower limit is 20% of the circulation tank 6's volume. When the circulation tank 6 level is below 20%, the automatic replenishment control valve opens to replenish wastewater into the circulation tank. When the circulation tank 6 level is above 80%, the automatic replenishment control valve closes to stop replenishing wastewater into the circulation tank.

[0033] The outlet pipe of wastewater pump 3 is equipped with an external discharge bypass connected to the inlet of the terminal drying system. An automatic control valve 10 for the external discharge pipeline is installed on this bypass. A conductivity analyzer is installed on the outlet pipe of the circulating pump 3, and an automatic control valve 9 for the circulating pipeline is installed on the inlet pipe of the wastewater heater 5. The conductivity analyzer, the automatic control valve 9 for the circulating pipeline, and the automatic control valve 10 for the external discharge pipeline are interlocked via a PLC control system. The conductivity analyzer has upper and lower conductivity limits to facilitate automated control. When the conductivity of the wastewater at the outlet of the circulating pump exceeds the upper limit, the automatic control valve for the external discharge pipeline opens and the automatic control valve for the circulating pipeline closes, discharging concentrated wastewater into the terminal drying system. When the conductivity analyzer detects that the conductivity of the wastewater at the outlet of the circulating pump is lower than the lower limit of conductivity, it controls the automatic control valve of the circulating pipeline to open and the automatic control valve of the discharge pipeline to close, stopping the discharge of concentrated wastewater to the terminal drying system. The wastewater at the outlet of the circulating pump then re-enters the wastewater heater and the supergravity device for concentration.

[0034] Specifically, fan 2 uses frequency conversion regulation to adjust the air volume.

[0035] Specifically, a circulation pipeline regulating valve 4 is installed on the outlet pipeline of circulation pump 3 to regulate the wastewater circulation flow rate.

[0036] Specifically, the hypergravity device 1 uses frequency conversion to adjust the rotation speed, with the rotation speed adjustment range being 600-1200 r / min.

[0037] Specifically, the wastewater heater 5 adopts a horizontal shell and tube heat exchanger and uses hot water as the heat source.

[0038] Comparison Figure 1 The wastewater heater 5 has a hot channel on the tube side and a cold channel on the shell side. The outlet of the circulation tank 6 is connected to the liquid inlet of the hypergravity device 1 via a pipeline through the circulation pump 3 and the cold channel on the shell side of the wastewater heater 5. A hot medium water inlet pipe and a hot medium water outlet pipe are connected to the hot channel on the tube side of the wastewater heater 5. A hot medium water regulating valve 8 is installed on the hot medium water inlet pipe to regulate the wastewater temperature at the outlet of the wastewater heater.

[0039] The operation and control method of a wastewater concentration system based on a centrifugal device includes the following steps:

[0040] 1) Airflow is controlled by adjusting the frequency of fan 2;

[0041] 2) The wastewater circulation flow rate is controlled by adjusting the opening of the circulation pipeline regulating valve 4 at the outlet of the circulation pump 3;

[0042] 3) Adjust the appropriate rotation speed of the hypergravity device 1 according to the gas-liquid ratio of the material introduced into the hypergravity device 1;

[0043] 4) By adjusting the heat transfer water regulating valve 8, the wastewater temperature at the outlet of the wastewater heater 5 is controlled to the set value;

[0044] 5) Based on the real-time feedback from the conductivity analyzer at the outlet of the circulating pump 3, when the conductivity exceeds the upper limit, the automatic control valve 9 of the circulating pipeline is automatically closed and the automatic control valve 10 of the external discharge pipeline is opened; when the conductivity is lower than the lower limit, the automatic control valve 10 of the external discharge pipeline is automatically closed and the automatic control valve 9 of the circulating pipeline is opened.

[0045] The contents described in this specification are merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of this invention should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A wastewater concentration system based on a centrifugal device, characterized in that... The device includes a hypergravity device (1), a fan (2), a circulating pump (3), a wastewater heater (5), and a circulating tank (6). The gas phase inlet of the hypergravity device (1) is connected to the fan (2) by a pipeline. The air inlet of the fan (2) is directly connected to the atmosphere. The liquid phase outlet of the hypergravity device (1) is connected to the circulating tank (6) by a pipeline. The liquid outlet of the circulating tank (6) is then connected to the liquid phase inlet of the hypergravity device (1) by a pipeline through the circulating pump (3) and the wastewater heater (5). The gas phase outlet of the hypergravity device (1) discharges gas carrying water vapor. The inlet of the circulation tank (6) is connected to a water supply pipeline for replenishing wastewater, and the circulation tank (6) is also equipped with a level gauge for monitoring the wastewater level.

2. The wastewater concentration system based on a hypergravity device as described in claim 1, characterized in that... It also includes a high-level tank containing wastewater, the outlet of which is connected to the inlet of the circulation tank (6) through the water replenishment pipeline. The water replenishment pipeline is equipped with an automatic water replenishment control valve (7), which is interlocked with the level gauge through a PLC control system.

3. The wastewater concentration system based on a hypergravity device as described in claim 1, characterized in that... The outlet pipe of the circulating pump (3) is connected to the inlet of the terminal drying system via an external discharge bypass. An automatic control valve (10) for the external discharge pipeline is installed on the external discharge bypass.

4. The wastewater concentration system based on a hypergravity device as described in claim 3, characterized in that... A conductivity analyzer is installed on the outlet pipe of the circulating pump (3), and an automatic control valve (9) for the circulating pipeline is installed on the inlet pipe of the wastewater heater (5). The conductivity analyzer, the automatic control valve (9) for the circulating pipeline, and the automatic control valve (10) for the discharge pipeline are interlocked and controlled by a PLC control system. When the conductivity data of the wastewater monitored by the conductivity analyzer is lower than the set value, the PLC control system controls the automatic control valve (9) for the circulating pipeline to open and the automatic control valve (10) for the discharge pipeline to close. When the conductivity data of the wastewater monitored by the conductivity analyzer is higher than the set value, the PLC control system controls the automatic control valve (10) for the discharge pipeline to open and the automatic control valve (9) for the circulating pipeline to close, and discharges concentrated wastewater to the terminal drying system.

5. A wastewater concentration system based on a hypergravity device as described in claim 1, characterized in that... A circulation pipeline regulating valve (4) is installed on the outlet pipeline of the circulation pump (3).

6. A wastewater concentration system based on a hypergravity device as described in claim 1, characterized in that... The wastewater heater (5) is a horizontal tube heat exchanger that uses hot water as a heat source.

7. A wastewater concentration system based on a hypergravity device as described in claim 6, characterized in that... The wastewater heater (5) has a hot channel in the tube side and a cold channel in the shell side. The outlet of the circulation tank (6) is connected to the liquid inlet of the hypergravity device (1) by a pipeline through the circulation pump (3) and the cold channel in the shell side of the wastewater heater (5). The hot channel in the tube side of the wastewater heater (5) is connected to a hot medium water inlet pipe and a hot medium water outlet pipe. A hot medium water regulating valve (8) is installed on the hot medium water inlet pipe.

8. A wastewater concentration system based on a hypergravity device as described in claim 1, characterized in that... The gas phase outlet of the supergravity device (1) is connected to the desulfurization inlet flue of the desulfurization absorption tower.

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