Air-water mixing method based on double regulation of dynamic flow and ozone inhalation amount

Abstract

The application relates to a kind of gas-water mixing methods based on double regulation of power flow and ozone gas suction amount, PLC automatic control system is according to the water temperature data of online temperature sensor output, ozone gas dosing amount is automatically adjusted according to the logic set;The ozone gas dosing amount can be actively adjusted;PLC automatic control system real-time acquisition ozone gas suction amount before jet suction, and monitor electromagnetic flowmeter signal of water pump flow, calculate the gas-water ratio λ of gas-water mixing;If the gas-water ratio value is in the preset range at this time, it is not necessary to adjust;If the gas-water ratio value is not in the preset range at this time, PLC automatic control system is according to the value of ozone gas suction amount output in front end, PID automatically adjusts the frequency of water pump, so that the power water flow meets the range setting of the gas-water ratio.

Description

Technical Field

[0001] This invention relates to a gas-water mixing method, and more particularly to a gas-water mixing method based on dual regulation of power flow rate and ozone intake, belonging to the field of gas-water mixing technology. Background Technology

[0002] Ozone, due to its high oxidation-reduction potential in water (2.07V, second only to fluorine), is frequently used for sterilization, disinfection, deodorization, decolorization, and oxidative decomposition of organic matter, and has wide applications in water treatment. When applied to circulating cooling water treatment, it achieves a balance between scale inhibition, corrosion inhibition, and sterilization, without leaving any toxic residues or causing secondary pollution.

[0003] Ozone mass transfer in water is an absorption process enhanced by chemical reactions. Under certain temperature and pressure conditions, the ozone mass transfer efficiency can be improved by increasing the gas-liquid contact area and reducing the ozone self-decomposition rate in the liquid phase. The jet contactor is a mixer based on the basic hydraulic principle of Venturi. It draws ozone into the mixture through vacuum suction. During the vigorous mixing process, the water flow turbulence forms smaller bubbles, which increases the gas-liquid contact area, reduces the thickness of the laminar sublayer, and enhances gas-liquid mass transfer. It is suitable for small-flow gas-water mass transfer systems.

[0004] Whether used alone or effectively combined with other advanced oxidation processes, the gas-water mass transfer efficiency is a key parameter for ozone hydrodynamic mass transfer reactors. Currently, ozone water treatment projects at home and abroad adopt gas-water mixing systems designed based on jet contactors and other gas-water mixing and diffusion devices. The ozone utilization rate can reach more than 70%. Stable and efficient gas-water mass transfer efficiency can improve ozone utilization, reduce exhaust gas emissions, and save system energy consumption.

[0005] However, during the operation of water treatment projects (especially ozone-treated circulating water projects), ozone consumption fluctuates due to changes in water quality and temperature, necessitating timely adjustments to the ozone generator output. Changes in the intake volume lead to variations in the gas-to-water ratio of the inhaler, resulting in unstable gas-to-water mass transfer (a low gas-to-water ratio wastes energy; a high ratio reduces mass transfer efficiency and ozone utilization). Therefore, providing a gas-to-water mixing method based on dual regulation of power flow rate and ozone intake volume is a pressing technical problem in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a gas-water mixing method based on dual regulation of power flow rate and ozone intake. By regulating the power flow rate and ozone intake of the gas-water mixing system according to the set ozone water concentration, the gas-water ratio is maintained within the set optimal range, so that the gas-water mass transfer efficiency can still operate stably at a high level (e.g., 95%) under dynamic adjustment of ozone flow rate, thereby improving ozone utilization and reducing exhaust gas production.

[0007] The present invention adopts the following technical solution:

[0008] A gas-water mixing method based on dual regulation of power flow rate and ozone inhalation volume is disclosed. During the initial operation of the gas-water mixing system, the ozone generator operates according to the ozone dosage determined under initial operating conditions, and the water pump starts operating at the initial frequency. Ozone gas and water are dissolved and mixed sequentially through a jet inhaler, a gas-water mixer, and a mixing tower. At this time, the PLC automatic control system automatically adjusts the ozone gas dosage (Q: g / h) according to the water temperature data output by the online temperature sensor and the logic set according to the ozone demand QD. The ozone gas dosage (Q: g / h) can be actively adjusted.

[0009]

[0010] Where QD is the ozone demand, in mg / h; D is the DO3 control value, in mg / L; and Qs is the circulating water flow rate, in m³ / h. 3 / s; η is the experimental data of ozone utilization rate; t is the water temperature at the injection point, with a value range of 0 < t < 40, in °C; L is the transmission distance from the injection point to the protected object, in m; d is the inner diameter of the transmission pipe from the injection point to the protected object, in m; T0 is the ozone half-life at water temperature t, in s; The PLC automatic control system collects the ozone intake volume (G: m / h) in front of the jet inhaler in real time, and the electromagnetic flowmeter signal (S: m / h) monitoring the water pump flow rate, and calculates the gas-water ratio λ (λ = G / S * 100%); if the gas-water ratio value is within the preset range, no adjustment is required; if the gas-water ratio value is not within the preset range, the PLC automatic control system automatically adjusts the frequency of the water pump according to the ozone intake volume (G: m / h) value output from the front end, so that the power water flow rate meets the set range of the gas-water ratio.

[0011] Preferably, the temperature sensor is located before the water pump to monitor the water temperature.

[0012] Preferably, the electromagnetic flow meter is located behind the jet inlet to monitor the water flow at that location.

[0013] Preferably, the gas-water mixer includes a primary mixer and a secondary mixer arranged sequentially.

[0014] Preferably, the ozone gas-water mixing system comprises a water intake pump, a jet inhaler, a primary mixer, a secondary mixer, and a mixing tower connected in sequence.

[0015] Furthermore, the mixing tower includes an automatic exhaust gas emission device.

[0016] Preferably, a filter is added before the water pump.

[0017] Preferably, it also includes an ozone content monitoring instrument, and the active adjustment of the ozone gas dosage (Q: g / h) is based on the monitoring value of the ozone content monitoring instrument.

[0018] Furthermore, the ozone content monitoring instrument includes an ozone concentration meter for monitoring the ozone concentration in water, or an instrument for monitoring the ozone flow rate and concentration in exhaust gas.

[0019] Preferably, the protected objects are the various heat exchange devices in the system.

[0020] The beneficial effects of this invention are as follows: According to the set ozone water concentration, the PLC automatic control system collects the ozone intake volume (G: m / h) before the jet inhaler in real time, and the electromagnetic flowmeter signal (S: m / h) monitoring the water pump flow rate, and calculates the gas-water ratio λ (λ = G / S * 100%). If the gas-water ratio is within the preset range, no adjustment is needed; if the gas-water ratio is not within the preset range, the PLC automatic control system automatically adjusts the frequency of the water pump based on the ozone intake volume (G: m / h) output from the front end, ensuring that the power water flow rate meets the set range of the gas-water ratio. Thus, through dual regulation of the power flow rate and ozone intake volume of the gas-water mixing system, the gas-water ratio is maintained within the set optimal range, ensuring that the gas-water mass transfer efficiency operates stably above 95%, improving ozone utilization and reducing exhaust gas production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process flow of a gas-water mixing system based on dual regulation of power flow rate and ozone intake.

[0022] Figure 2 This is a schematic diagram of the logic control of the gas-water mixing method based on the dual regulation of power flow rate and ozone inhalation volume of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1As shown, a gas-water mixing system based on dual regulation of power flow rate and ozone intake volume provides an ozone gas-water mixing system including a water intake pump, a jet inhaler, a primary mixer, a secondary mixer, and a mixing tower (including an automatic exhaust gas emission device). This system ensures that the mass transfer efficiency of the gas-water mixing system reaches more than 95% through dual regulation of power flow rate and ozone intake volume, so that the ozone gas produced by the ozone generator is utilized to the maximum extent.

[0025] Specifically, the work process is as follows, combined with Figure 1 and Figure 2 :

[0026] When the gas-water mixing system is first run, the ozone generator is operated according to the ozone dosage determined under the test conditions (20℃). The water pump is started at the power frequency. The ozone gas and water are fully dissolved and mixed after passing through the jet inhaler, primary mixer, secondary mixer and mixing tower in sequence. A small amount of unused ozone gas enters the digester through the automatic exhaust valve at the top of the degassing tower.

[0027] The PLC automatic control system automatically adjusts the ozone gas dosage (Q: g / h) according to the water temperature data output by the online temperature sensor and the set logic.

[0028] The ozone gas dosage (Q: g / h) can be actively adjusted;

[0029]

[0030] Where QD represents ozone demand, in mg / h;

[0031] D represents the DO3 control value, in mg / L;

[0032] Qs represents the circulating water flow rate, in meters (m³). 3 / s;

[0033] η represents experimental data on ozone utilization efficiency;

[0034] t is the water temperature at the injection point, with a range of 0 < t < 40, in °C;

[0035] L is the transmission distance from the injection point to the protected object, in meters (m).

[0036] d is the inner diameter of the transfer pipe from the injection point to the protected object, in meters (m).

[0037] T0 is the ozone half-life at water temperature t, in seconds;

[0038] The PLC automatic control system collects ozone intake (G: m / h) and electromagnetic flowmeter signal (S: m / h) in real time, and calculates the gas-water ratio λ of the mixing system (λ=G / S*100%).

[0039] If the air-to-water ratio is within the preset range (determined through pilot testing), no adjustment is needed. If the air-to-water ratio is outside the preset range, the mixing system automatically adjusts the water pump frequency using a PID controller based on the ozone intake value output from the front end, ensuring that the motive water flow meets the air-to-water ratio requirements.

[0040] The automatic control system collects ozone concentration data (W: mg / L), calculates and outputs gas-water mass transfer efficiency data η (η=W*S / Q*100%).

[0041] In this embodiment, see Figure 1 The temperature sensor is installed before the water pump to monitor the water temperature.

[0042] In this embodiment, see Figure 1 The electromagnetic flowmeter is located behind the jet inlet to monitor the water flow at that location.

[0043] In this embodiment, see Figure 1 The gas-water mixer includes a primary mixer and a secondary mixer arranged sequentially.

[0044] In this embodiment, see Figure 1 The ozone-water mixing system comprises a water intake pump, a jet inhaler, a primary mixer, a secondary mixer, and a mixing tower connected in sequence. The mixing tower includes an automatic exhaust gas emission device.

[0045] In this embodiment, see Figure 1 A filter is added before the water pump.

[0046] In this embodiment, see Figure 1 It also includes an ozone content monitoring instrument, and the active adjustment of the ozone gas dosage (Q: g / h) is based on the monitoring value of the ozone content monitoring instrument. Furthermore, the ozone content monitoring instrument includes an ozone concentration meter for monitoring the ozone concentration in water, or an instrument for monitoring the ozone flow rate and concentration in exhaust gas.

[0047] In this embodiment, the protected objects are the various heat exchange devices in the system. Here, "protection" refers to the protective function of ozone on the inner wall of the pipes, achieving the effects of scale inhibition, corrosion slowing, and sterilization.

[0048] In summary, this invention, based on a set ozone water concentration, uses a PLC automatic control system to collect real-time ozone intake volume (G: m / h) before the jet inhaler and electromagnetic flowmeter signal (S: m / h) monitoring the water pump flow rate. It then calculates the gas-water ratio λ (λ = G / S * 100%). If the gas-water ratio is within a preset range, no adjustment is needed. If it is outside this range, the PLC automatic control system automatically adjusts the water pump frequency using a PID controller based on the ozone intake volume (G: m / h) output from the front end, ensuring the power water flow rate meets the set gas-water ratio range. Thus, through dual regulation of the power flow rate and ozone intake volume of the gas-water mixing system, the gas-water ratio is maintained within the optimal range, resulting in a stable gas-water mass transfer efficiency of over 95%, improving ozone utilization, and reducing exhaust gas production.

[0049] The above are preferred embodiments of the present invention. Those skilled in the art can make various modifications or improvements based on these embodiments. Without departing from the overall concept of the present invention, such modifications or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A gas-water mixing method based on dual regulation of dynamic flow rate and ozone uptake, characterized in that: When the gas-water mixing system is initially started, the ozone generator operates according to the ozone dosage determined under initial operating conditions, and the water pump starts operating at the initial frequency. Ozone gas and water are dissolved and mixed sequentially after passing through the jet inhaler, gas-water mixer, and mixing tower. At this time... The PLC automatic control system automatically adjusts the ozone gas dosage (Q: g / h) according to the water temperature data output by the online temperature sensor and the logic set according to the ozone demand QD; the ozone gas dosage (Q: g / h) can be actively adjusted. Where QD represents ozone demand, in mg / h; D represents the DO3 control value, in mg / L; Qs represents the circulating water flow rate, in meters (m³). 3 / s η represents experimental data on ozone utilization efficiency; t represents the water temperature at the injection point, with a range of 0 < t < 40°C. L is the transmission distance from the injection point to the protected object, in meters (m). d is the inner diameter of the transfer pipe from the injection point to the protected object, in meters (m). T0 is the ozone half-life at water temperature t, measured in seconds. The PLC automatic control system collects the ozone inhalation volume G in front of the jet inhaler in real time, where G is the ozone gas volumetric flow rate in m³ / h; and the electromagnetic flowmeter signal S that monitors the water pump flow rate, where S is the water volumetric flow rate in m³ / h; and calculates the gas-water ratio λ of the gas-water mixture, which satisfies: λ = G / S × 100%. If the air-to-water ratio is within the preset range, no adjustment is needed; if the air-to-water ratio is not within the preset range, the PLC automatic control system will automatically adjust the frequency of the water pump based on the ozone intake volume (G: m³ / h) output from the front end, so that the power water flow meets the set range of the air-to-water ratio.

2. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: The temperature sensor is installed before the water pump to monitor the water temperature.

3. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: The electromagnetic flow meter is installed behind the jet inlet to monitor the water flow at that location.

4. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: The gas-water mixer includes a primary mixer and a secondary mixer arranged sequentially.

5. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: The ozone gas-water mixing system comprises a water intake pump, a jet inhaler, a primary mixer, a secondary mixer, and a mixing tower connected in sequence.

6. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 5, characterized in that: The mixing tower includes an automatic exhaust gas emission device.

7. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: A filter is added before the water intake pump.

8. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: It also includes an ozone content monitoring instrument, and the active adjustment of the ozone gas dosage (Q: g / h) is based on the monitoring value of the ozone content monitoring instrument.

9. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 8, characterized in that: The ozone content monitoring instruments include ozone concentration meters for monitoring ozone concentration in water bodies, or instruments for monitoring ozone flow rate and concentration in exhaust gases.

10. The gas-water mixing method based on dual regulation of power flow rate and ozone inhalation rate as described in claim 1, characterized in that: The protected objects are the various heat exchange devices in the system.

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