Two-stage degassing device and energy-saving operation control method

Abstract

The invention belongs to the technical field of water treatment, and provides a two-stage degassing device and an energy-saving operation control method.The device comprises a first-stage degassing unit, a second-stage degassing unit and a control system; the first-stage degassing unit is used for performing basic removal on free gas in circulating water, outputting the circulating water after first-stage degassing, and collecting and sending circulating water monitoring data to the control system; the control system is used for performing secondary start-stop condition judgment according to the circulating water monitoring data and a preset threshold comparison strategy to obtain a secondary start-stop condition judgment result, and controlling the start-stop state of the secondary degassing unit according to the secondary start-stop condition judgment result; and the second-stage degassing unit is used for deeply removing residual free gas and dissolved oxygen in the circulating water subjected to the first-stage degassing in a vacuum environment. According to the scheme, through cooperative linkage of the first-stage degassing unit, the second-stage degassing unit and the control system, layered treatment and intelligent regulation and control of circulating water degassing are achieved, and the system has the advantages of being excellent in degassing effect and saving energy.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a two-stage degassing device and an energy-saving operation control method. Background Technology

[0002] Circulating water systems are widely used in industrial and civil applications such as heating, air conditioning, and industrial cooling. The circulating water in these systems typically contains free gases and dissolved oxygen. The presence of these gases can have many adverse effects on the safe and stable operation of the circulating water system: free gases can easily form airlocks in the pipes, disrupting the hydraulic balance of the system and significantly reducing the heat exchange efficiency of the heat exchange equipment; dissolved oxygen can accelerate the metal corrosion of pipes and equipment, while providing suitable conditions for the growth of microorganisms, which not only shortens the service life of the system equipment, but also further affects the overall energy efficiency and operational stability of the circulating water system.

[0003] To address the aforementioned issues, various degassing devices for circulating water systems have emerged in the existing technology, mainly divided into two categories: basic degassing equipment and deep degassing equipment. Each type of equipment has its own technological advantages and significant drawbacks, and neither can independently meet the dual requirements of both effective degassing and energy-efficient operation in circulating water systems. Specifically, basic degassing equipment can achieve preliminary removal of free gases from circulating water without additional power, resulting in low energy consumption and a simple structure. However, it can only separate free gases and cannot effectively remove dissolved oxygen from the water, thus limiting its degassing effect and failing to meet the industry's stringent standards for dissolved oxygen content in circulating water. Deep degassing equipment, on the other hand, can create a vacuum environment to efficiently extract and remove residual free gases and dissolved oxygen from the water, achieving significant degassing effects and meeting the system's deep degassing requirements. However, this type of equipment requires a power unit to continuously operate and maintain the vacuum environment, resulting in high overall energy consumption and operating costs. Continuous operation under normal conditions of low gas content in the circulating water system would lead to substantial energy waste.

[0004] This shows that traditional degassing devices have a technical problem where it is difficult to balance operating costs and degassing quality. Summary of the Invention

[0005] This invention provides a two-stage degassing device and an energy-saving operation control method to solve the problem that traditional degassing devices cannot balance operating costs and degassing quality.

[0006] On one hand, the present invention provides a two-stage degassing device, comprising: a primary degassing unit, a secondary degassing unit, and a control system; The primary degassing unit and the secondary degassing unit are connected in series, and the control system is electrically connected to the primary degassing unit and the secondary degassing unit respectively. The primary degassing unit is used to perform basic removal of free gases in the circulating water, output the circulating water after primary degassing, and collect and send the circulating water monitoring data to the control system. The control system is used to determine the secondary start-stop conditions based on the circulating water monitoring data and according to a preset threshold comparison strategy, obtain the secondary start-stop condition determination result, and control the start-stop state of the secondary degassing unit based on the secondary start-stop condition determination result. The secondary degassing unit is used to deeply remove residual free gas and dissolved oxygen from the circulating water after the primary degassing in a vacuum environment.

[0007] According to the two-stage degassing device provided by the present invention, the first-stage degassing unit includes: a centrifugal degassing tank, an automatic exhaust valve, and a data monitoring device; The inlet of the centrifugal deaerator is connected to the return water main of the circulating water system. The automatic air vent is installed on the top of the centrifugal deaerator. The data monitoring equipment is installed on the corresponding pipes of the centrifugal deaerator and the automatic air vent.

[0008] According to the two-stage degassing device provided by the present invention, the data monitoring equipment includes: a gas mass flow meter and a dissolved oxygen detector; The gas mass flow meter is installed on the exhaust port pipe of the automatic exhaust valve, and the gas mass flow meter is used to collect the flow rate of the gas released per unit time. The dissolved oxygen detector is installed on the outlet pipe of the centrifugal deaeration tank. The dissolved oxygen detector is used to monitor the dissolved oxygen content in the circulating water after primary deaeration.

[0009] According to the two-stage degassing device provided by the present invention, the two-stage degassing unit includes: a vacuum forced degassing device and a degassing pump; The inlet of the vacuum forced degassing device is connected to the outlet of the centrifugal degassing tank, and the outlet of the vacuum forced degassing device is connected to the water supply main of the circulating water system. The degassing pump is connected to the forced vacuum degassing device. The degassing pump is used to provide a vacuum environment for the forced vacuum degassing device and to discharge the degassed gas.

[0010] According to the two-stage degassing device provided by the present invention, the control system performs a second-stage start-stop condition judgment based on the circulating water monitoring data and a preset threshold comparison strategy to obtain the second-stage start-stop condition judgment result, including: When the secondary degassing unit is in a shutdown state, the circulating water monitoring data is compared with a set upper limit threshold to obtain the first comparison result; Based on the first comparison result, the result of the secondary start-up condition judgment is determined; When the secondary degassing unit is in the start-up state, the circulating water monitoring data is compared with the set lower limit threshold to obtain a second comparison result; Based on the second comparison result, the judgment result of the secondary shutdown condition is determined; The results of the second-level start-up condition judgment and the results of the second-level stop-down condition judgment are used as the results of the second-level start-stop condition judgment.

[0011] According to the two-stage degassing device provided by the present invention, the circulating water monitoring data includes: gas flow rate and dissolved oxygen content; The circulating water monitoring data is compared with a set upper limit threshold to obtain a first comparison result, including: The gas flow rate is compared with a preset upper limit value to obtain the upper limit comparison result. The dissolved oxygen content is compared with the preset upper limit of oxygen content to obtain the upper limit of oxygen content comparison result; The comparison results of the upper limit of flow rate and the upper limit of oxygen content are used as the first comparison results.

[0012] According to the two-stage degassing device provided by the present invention, the determination of the second-stage start-up condition judgment result based on the first comparison result includes: If the flow rate limit comparison result in the first comparison result satisfies that the gas flow rate is greater than the flow rate limit value, and / or the oxygen content limit comparison result in the first comparison result satisfies that the dissolved oxygen content is greater than the oxygen content limit value, then the secondary start-up condition judgment result is determined to be that the secondary start-up condition is met. If the flow rate upper limit comparison result in the first comparison result satisfies the condition that the gas flow rate is less than or equal to the flow rate upper limit value, and the oxygen content upper limit comparison result in the first comparison result satisfies the condition that the dissolved oxygen content is less than or equal to the dissolved oxygen content upper limit value, then the result of the secondary start-up condition judgment is determined to be that the secondary start-up condition is not met.

[0013] According to the two-stage degassing device provided by the present invention, the circulating water monitoring data includes: gas flow rate and dissolved oxygen content; The circulating water monitoring data is compared with a set lower threshold to obtain a second comparison result, including: The gas flow rate is compared with a preset lower limit value to obtain the lower limit comparison result. The dissolved oxygen content is compared with a preset lower limit value for oxygen content to obtain the lower limit comparison result for oxygen content. The comparison results of the lower limit of flow rate and the lower limit of oxygen content are used as the second comparison results.

[0014] According to the two-stage degassing device provided by the present invention, the determination of the second-stage shutdown condition judgment result based on the second comparison result includes: If the flow rate lower limit comparison result in the second comparison result satisfies the gas flow rate being lower than the flow rate lower limit value, and the dissolved oxygen content lower limit comparison result in the second comparison result satisfies the dissolved oxygen content being lower than the oxygen content lower limit value, then the secondary shutdown condition judgment result is determined to meet the secondary shutdown condition. If the flow rate lower limit comparison result in the second comparison result satisfies the gas flow rate being greater than or equal to the flow rate lower limit value, and / or the oxygen content lower limit comparison result in the second comparison result satisfies the dissolved oxygen content being greater than or equal to the dissolved oxygen content lower limit value, then the result of the secondary shutdown condition judgment is determined to be that the secondary shutdown condition is not met.

[0015] On the other hand, the present invention also provides an energy-saving operation control method, based on any of the above-described two-stage degassing devices, the method comprising: The free gas in the circulating water is basically removed through the first-stage degassing unit, and the circulating water after the first-stage degassing is output. The circulating water monitoring data is collected and sent to the control system. The control system uses the circulating water monitoring data to determine the secondary start-stop conditions according to a preset threshold comparison strategy, obtains the secondary start-stop condition determination results, and controls the start-stop status of the secondary degassing unit based on the secondary start-stop condition determination results. The residual free gas and dissolved oxygen in the circulating water after the first stage of degassing are deeply removed in a vacuum environment through a two-stage degassing unit.

[0016] The two-stage degassing device and energy-saving operation control method provided by this invention achieve stratified treatment and intelligent regulation of circulating water degassing through the coordinated linkage of the primary degassing unit, the secondary degassing unit, and the control system. This results in both excellent degassing performance and significant energy-saving advantages. Specifically, the primary degassing unit efficiently removes free gases on a routine basis. The control system, relying on circulating water monitoring data and a preset threshold comparison strategy, enables the secondary degassing unit to start and stop on demand. This completely changes the traditional mode of continuous operation required for deep degassing equipment, significantly reducing the overall energy consumption and operating costs of the device. Simultaneously, the overall structural design is simple and tightly integrated, with clear division of labor and precise coordination among the units. It retains the low-consumption advantages of basic degassing equipment while leveraging the high-efficiency performance of deep degassing equipment. Under the premise of ensuring degassing meets standards, it achieves an organic unity of energy saving and long-term stable operation, possessing strong practicality and industry promotion value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the structural schematic diagrams of the two-stage degassing device provided in the embodiments of the present invention; Figure 2 This is the second schematic diagram of the two-stage degassing device provided in the embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the two-stage degassing device in an embodiment of the present invention; Figure 4 This is a schematic flowchart of an energy-saving operation control method based on a two-stage degassing device provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] The following is combined Figures 1 to 4 This invention describes the detailed scheme of the two-stage degassing device and energy-saving operation control method provided in the embodiments of the present invention.

[0021] like Figure 1 As shown, the two-stage degassing device provided in this embodiment of the invention specifically includes: a primary degassing unit 110, a secondary degassing unit 120, and a control system 130.

[0022] The primary degassing unit 110 and the secondary degassing unit 120 are connected in series, and the control system 130 is electrically connected to both the primary degassing unit 110 and the secondary degassing unit 120. Figure 1 It can be seen that the inlet of the primary degassing unit 110 is connected to the return water main pipe 140 of the circulating water system, and the outlet of the secondary degassing unit 120 is connected to the outlet water main pipe 150 of the circulating water system.

[0023] The primary degassing unit 110 is used to perform basic removal of free gases in the circulating water, output the circulating water after primary degassing, and collect and send the circulating water monitoring data to the control system 130. The control system 130 is used to determine the secondary start-stop conditions based on the circulating water monitoring data and according to the preset threshold comparison strategy, obtain the secondary start-stop condition determination results, and control the start-stop state of the secondary degassing unit 120 based on the secondary start-stop condition determination results. The secondary degassing unit 120 is used to deeply remove residual free gas and dissolved oxygen from the circulating water after primary degassing in a vacuum environment.

[0024] The solution provided in this embodiment features a complementary two-stage degassing design. The primary degassing unit is responsible for normal degassing, while the secondary degassing unit is responsible for enhanced degassing. This ensures that the gas and dissolved oxygen content of the circulating water system can be effectively controlled under various operating conditions, thereby improving the stability and reliability of the entire system.

[0025] In one embodiment, combined with Figure 2 As shown, the primary degassing unit includes: a centrifugal degassing tank 210, an automatic exhaust valve 220, and data monitoring equipment.

[0026] The inlet of the centrifugal deaerator 210 is connected to the return water main of the circulating water system. The automatic air vent valve 220 is installed on the top of the centrifugal deaerator 210. Data monitoring equipment is installed on the corresponding pipes of the centrifugal deaerator 210 and the automatic air vent valve 220.

[0027] In a specific implementation, such as Figure 2 As shown, the data monitoring equipment includes: a gas mass flow meter 230 and a dissolved oxygen detector 240.

[0028] The gas mass flow meter 230 is installed on the exhaust port pipe of the automatic exhaust valve 220. The gas mass flow meter 230 is used to collect the flow rate of the gas released per unit time.

[0029] The dissolved oxygen detector 240 is installed on the outlet pipe of the centrifugal deaerator 210. The dissolved oxygen detector 240 is used to monitor the dissolved oxygen content in the circulating water after primary deaeration.

[0030] In practical applications, the return water of the circulating water system enters the centrifugal deaeration tank 210 under the power of the main circulation pump. The water flow forms a high-speed rotating flow state in the centrifugal deaeration tank 210. Using the centrifugal force, the free gas with a specific gravity much smaller than water is separated from the water body. The separated free gas gathers upward in the top area of ​​the centrifugal deaeration tank 210. When the gas at the top of the tank accumulates to a preset amount, the automatic exhaust valve 220 automatically opens, thereby discharging the free gas.

[0031] During the exhaust process, the gas mass flow meter 230 collects and records the degassing flow rate data per unit time in real time, which is the gas flow rate in the circulating water monitoring data. The circulating water, having undergone basic degassing in the centrifugal degassing tank 210, flows out from its outlet and passes through the dissolved oxygen detector 240. The dissolved oxygen detector 240 monitors and collects the dissolved oxygen content data in the water in real time, which is the dissolved oxygen content in the circulating water monitoring data. The aforementioned gas flow rate and dissolved oxygen content can be sent to the control system in real time, thus providing data for determining the start and stop of the secondary degassing unit.

[0032] In one embodiment, such as Figure 2 As shown, the secondary degassing unit specifically includes: a vacuum forced degassing device 250 and a degassing pump 260.

[0033] The inlet of the vacuum forced degassing device 250 is connected to the outlet of the centrifugal degassing tank 210, and the outlet of the vacuum forced degassing device 250 is connected to the water supply main of the circulating water system.

[0034] The degassing pump 260 is connected to the vacuum forced degassing device 250. The degassing pump 260 is used to provide a vacuum environment for the vacuum forced degassing device 250 and to discharge the degassed gas.

[0035] In practical applications, the degassing pump 260 and the forced vacuum degassing device 250 are connected in a sealed manner. The degassing pump 260, as the power component of the secondary degassing unit, has its working status directly controlled by the control system. When the degassing pump 260 starts, it creates a stable negative pressure vacuum environment inside the forced vacuum degassing device 250, causing the circulating water entering the forced vacuum degassing device 250 to be forced to precipitate residual free gases and dissolved oxygen in the water in the form of tiny bubbles under vacuum conditions. The precipitated gases are quickly discharged from the system through the degassing pump 260, achieving deep degassing treatment of the circulating water. When the degassing pump 260 stops, the forced vacuum degassing device 250 stops vacuum degassing operations, and the circulating water flows directly from inside the forced vacuum degassing device 250 to the water supply main of the circulating water system.

[0036] In this embodiment, the control system is the core of the entire two-stage degassing device. It has a preset threshold comparison strategy, and also has preset upper and lower threshold values ​​corresponding to the circulating water monitoring data. The upper threshold value includes a preset upper limit value for flow rate and a preset upper limit value for oxygen content. The lower threshold value includes a preset lower limit value for flow rate and a preset lower limit value for oxygen content.

[0037] In one embodiment, combined with Figure 3 The control system uses circulating water monitoring data and a preset threshold comparison strategy to determine the secondary start-up and shutdown conditions, obtaining the results of the secondary start-up and shutdown condition determination, specifically including: First, with the secondary degassing unit in a shutdown state, the entire device is in a normal degassing stage. The circulating water monitoring data is compared with the set upper limit threshold to obtain the first comparison result.

[0038] In this embodiment, the circulating water monitoring data specifically includes: gas flow rate and dissolved oxygen content.

[0039] Furthermore, the circulating water monitoring data is compared with the set upper limit threshold to obtain the first comparison result, which specifically includes: The first step is to compare the gas flow rate with the preset upper limit of the flow rate to obtain the upper limit of the flow rate comparison result.

[0040] In practical applications, the upper limit of the flow rate can be set to 1 to 1.2 times the actual measured gas flow rate after one hour of stable operation following formal commissioning; the lower limit of the flow rate can be set to 0% to 30% of the upper limit of the flow rate.

[0041] The second step is to compare the dissolved oxygen content with the preset upper limit of oxygen content to obtain the upper limit comparison result.

[0042] In practical applications, the upper limit of oxygen content can be reasonably set according to actual needs, for example, it can be set to 0.1 mg / L.

[0043] The third step is to use the comparison results of the upper limit of flow rate and the upper limit of oxygen content as the first comparison result.

[0044] Then, based on the first comparison result, the result of the second-level start-up condition judgment is determined.

[0045] In this embodiment, the determination of the secondary startup condition judgment result based on the first comparison result specifically includes: If the flow rate limit comparison result in the first comparison result satisfies that the gas flow rate is greater than the flow rate limit value, and / or the dissolved oxygen content limit comparison result in the first comparison result satisfies that the dissolved oxygen content is greater than the dissolved oxygen content limit value, then the result of the second-level start-up condition judgment is determined to be that the second-level start-up condition is met.

[0046] In this situation, when the control system determines that the secondary start-up condition is met, it can control the secondary degassing unit to start operation. Specifically, it can immediately send a start command to the degassing pump to start the secondary degassing unit for deep degassing. At this time, the entire device enters the enhanced degassing stage.

[0047] If the flow rate limit comparison result in the first comparison result satisfies that the gas flow rate is less than or equal to the flow rate limit value, and the dissolved oxygen content limit comparison result in the first comparison result satisfies that the dissolved oxygen content is less than or equal to the dissolved oxygen content limit value, then the result of the second-level start-up condition judgment is determined to be that the second-level start-up condition is not met.

[0048] In this situation, the control system determines that the secondary start-up condition is not met. At this time, the secondary degassing unit remains shut down, and the device is only operated by the primary degassing unit for routine degassing.

[0049] In addition, when the secondary degassing unit is in the start-up state, the circulating water monitoring data is compared with the set lower limit threshold to obtain a second comparison result.

[0050] In this embodiment, the circulating water monitoring data specifically includes: gas flow rate and dissolved oxygen content.

[0051] Furthermore, the circulating water monitoring data is compared with the set lower threshold to obtain a second comparison result, which specifically includes: The first step is to compare the gas flow rate with the preset lower limit value to obtain the lower limit comparison result.

[0052] The second step is to compare the dissolved oxygen content with the preset lower limit of oxygen content to obtain the lower limit comparison result.

[0053] In practical applications, the lower limit of oxygen content can be set as a fixed percentage of the upper limit of oxygen content. For example, the lower limit of oxygen content can be set as 50% of the upper limit of oxygen content.

[0054] The third step is to use the comparison results of the lower limit of flow rate and the lower limit of oxygen content as the second comparison results.

[0055] Next, based on the second comparison result, the judgment result of the second-level shutdown condition is determined.

[0056] In this embodiment, the determination of the secondary shutdown condition judgment result based on the second comparison result specifically includes: If the flow rate lower limit comparison result in the second comparison result satisfies that the gas flow rate is lower than the flow rate lower limit value, and the dissolved oxygen content lower limit comparison result in the second comparison result satisfies that the dissolved oxygen content is lower than the dissolved oxygen content lower limit value, then the result of the second-level shutdown condition judgment is determined to be that the second-level shutdown condition is met.

[0057] In this situation, the control system determines that the secondary shutdown condition is met. At this time, the secondary degassing unit can be stopped. Specifically, a shutdown command can be sent to the degassing pump to shut down the secondary degassing unit. The entire dual-machine degassing device will then switch back to the normal degassing stage where only the primary degassing unit is working.

[0058] If the flow rate lower limit comparison result in the second comparison result satisfies that the gas flow rate is greater than or equal to the flow rate lower limit value, and / or the oxygen content lower limit comparison result in the second comparison result satisfies that the dissolved oxygen content is greater than or equal to the oxygen content lower limit value, then the result of the second-level shutdown condition judgment is determined to be that the second-level shutdown condition is not met.

[0059] In this situation, the control system determines that the secondary shutdown condition is not met. At this time, the secondary degassing unit needs to remain running and continue to perform deep degassing.

[0060] Finally, the results of the second-level start-up condition judgment and the second-level stop condition judgment are used as the second-level start-stop condition judgment results.

[0061] Under normal operating conditions, only the primary degassing unit is working, while the secondary degassing unit is in standby mode. After the primary degassing unit removes the free gases, the circulating water is directly returned to the circulating water system.

[0062] During the normal degassing phase, the control system continuously receives and analyzes the circulating water monitoring data of the primary degassing unit. When the circulating water monitoring data triggers the secondary start-up conditions, the secondary degassing unit is immediately started, and the enhanced degassing phase begins, which can perform deep degassing on the circulating water. During the operation of the secondary degassing unit, the control system continues to monitor the data until the circulating water monitoring data simultaneously meets the secondary shutdown conditions. At this point, the secondary degassing unit is shut down, and the entire unit returns to the normal degassing phase.

[0063] Through the aforementioned cyclical intelligent control, the device can start and stop the secondary degassing unit as needed based on the gas content and dissolved oxygen content of the circulating water system. While ensuring the degassing effect of the circulating water, it minimizes the running time of the high-energy-consuming component, the degassing pump, thereby achieving energy saving and consumption reduction, and effectively improving the operational stability of the circulating water system.

[0064] In summary, the two-stage degassing device provided in this embodiment has at least the following advantages compared with existing degassing solutions: First, by using low-energy centrifugal degassing as the normal operating mode and only activating high-energy vacuum degassing when the gas flow rate or dissolved oxygen content exceeds the standard, the operating time of the degassing pump is significantly shortened, thereby achieving significant energy saving and consumption reduction.

[0065] Secondly, based on real-time monitoring of gas flow rate and dissolved oxygen content, closed-loop automatic control of the degassing process is realized, enabling the entire device to accurately respond to changes in water quality. This not only prevents excessive gas and dissolved oxygen content but also avoids ineffective operation of the vacuum degasser, ensuring that the degassing effect always meets the requirements.

[0066] Third, the two-stage degassing design complements each other. The first stage is responsible for normal degassing, while the second stage is responsible for enhanced degassing, ensuring that the gas and dissolved oxygen content of the circulating water system can be effectively controlled under various operating conditions, thereby improving the stability and reliability of the entire system.

[0067] Fourth, by effectively controlling the dissolved oxygen content, the corrosion rate of pipes and equipment can be significantly slowed down, extending the service life of the entire circulating water system. At the same time, reducing the operating time of the deaeration pump also indirectly extends its own service life.

[0068] Based on the same general inventive concept, this invention also protects an energy-saving operation control method based on a two-stage degassing device. The energy-saving operation control method provided by this invention is described below, and the energy-saving operation control method described below can be referred to in correspondence with the two-stage degassing device described above.

[0069] like Figure 4 As shown, the energy-saving operation control method provided in this embodiment of the invention can be implemented based on the two-stage degassing device provided in the above embodiments. The method specifically includes the following steps: Step 310: Perform basic removal of free gases in the circulating water through the primary degassing unit, output the primary degassed circulating water, and collect and send the circulating water monitoring data to the control system.

[0070] Step 320: The control system judges the secondary start-stop conditions based on the circulating water monitoring data and according to the preset threshold comparison strategy, obtains the secondary start-stop condition judgment results, and controls the start-stop status of the secondary degassing unit based on the secondary start-stop condition judgment results.

[0071] Step 330: Deeply remove residual free gas and dissolved oxygen from the circulating water after primary degassing in a vacuum environment through a secondary degassing unit.

[0072] Regarding the methods in the above embodiments, the specific implementation of each step has been described in detail in the embodiments of the relevant apparatus, and will not be elaborated further here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-stage degassing device, characterized in that, include: Primary degassing unit, secondary degassing unit, and control system; The primary degassing unit and the secondary degassing unit are connected in series, and the control system is electrically connected to the primary degassing unit and the secondary degassing unit respectively; The primary degassing unit is used to perform basic removal of free gases in the circulating water, output the circulating water after primary degassing, and collect and send the circulating water monitoring data to the control system. The control system is used to determine the secondary start-stop conditions based on the circulating water monitoring data and according to a preset threshold comparison strategy, obtain the secondary start-stop condition determination result, and control the start-stop state of the secondary degassing unit based on the secondary start-stop condition determination result. The secondary degassing unit is used to deeply remove residual free gas and dissolved oxygen from the circulating water after the primary degassing in a vacuum environment.

2. The two-stage degassing device according to claim 1, characterized in that, The primary degassing unit includes: a centrifugal degassing tank, an automatic exhaust valve, and data monitoring equipment; The inlet of the centrifugal deaerator is connected to the return water main of the circulating water system. The automatic air vent is installed on the top of the centrifugal deaerator. The data monitoring equipment is installed on the corresponding pipes of the centrifugal deaerator and the automatic air vent.

3. The two-stage degassing device according to claim 2, characterized in that, The data monitoring equipment includes: a gas mass flow meter and a dissolved oxygen detector; The gas mass flow meter is installed on the exhaust port pipe of the automatic exhaust valve, and the gas mass flow meter is used to collect the flow rate of the gas released per unit time. The dissolved oxygen detector is installed on the outlet pipe of the centrifugal deaeration tank. The dissolved oxygen detector is used to monitor the dissolved oxygen content in the circulating water after primary deaeration.

4. The two-stage degassing device according to claim 2, characterized in that, The secondary degassing unit includes: a vacuum forced degassing device and a degassing pump; The inlet of the vacuum forced degassing device is connected to the outlet of the centrifugal degassing tank, and the outlet of the vacuum forced degassing device is connected to the water supply main of the circulating water system. The degassing pump is connected to the forced vacuum degassing device. The degassing pump is used to provide a vacuum environment for the forced vacuum degassing device and to discharge the degassed gas.

5. The two-stage degassing device according to claim 1, characterized in that, The control system, based on the circulating water monitoring data, performs secondary start-up and shutdown condition judgment according to a preset threshold comparison strategy, and obtains the secondary start-up and shutdown condition judgment result, including: When the secondary degassing unit is in a shutdown state, the circulating water monitoring data is compared with a set upper limit threshold to obtain the first comparison result; Based on the first comparison result, the result of the secondary start-up condition judgment is determined; When the secondary degassing unit is in the start-up state, the circulating water monitoring data is compared with the set lower limit threshold to obtain a second comparison result; Based on the second comparison result, the judgment result of the secondary shutdown condition is determined; The results of the second-level start-up condition judgment and the results of the second-level stop-down condition judgment are used as the results of the second-level start-stop condition judgment.

6. The two-stage degassing device according to claim 5, characterized in that, The circulating water monitoring data includes: gas flow rate and dissolved oxygen content; The circulating water monitoring data is compared with a set upper limit threshold to obtain a first comparison result, including: The gas flow rate is compared with a preset upper limit value to obtain the upper limit comparison result. The dissolved oxygen content is compared with the preset upper limit of oxygen content to obtain the upper limit of oxygen content comparison result; The comparison results of the upper limit of flow rate and the upper limit of oxygen content are used as the first comparison results.

7. The two-stage degassing device according to claim 6, characterized in that, Based on the first comparison result, the secondary start-up condition judgment result is determined, including: If the flow rate limit comparison result in the first comparison result satisfies that the gas flow rate is greater than the flow rate limit value, and / or the oxygen content limit comparison result in the first comparison result satisfies that the dissolved oxygen content is greater than the oxygen content limit value, then the secondary start-up condition judgment result is determined to be that the secondary start-up condition is met. If the flow rate upper limit comparison result in the first comparison result satisfies the condition that the gas flow rate is less than or equal to the flow rate upper limit value, and the oxygen content upper limit comparison result in the first comparison result satisfies the condition that the dissolved oxygen content is less than or equal to the dissolved oxygen content upper limit value, then the result of the secondary start-up condition judgment is determined to be that the secondary start-up condition is not met.

8. The two-stage degassing device according to claim 5, characterized in that, The circulating water monitoring data includes: gas flow rate and dissolved oxygen content; The circulating water monitoring data is compared with a set lower threshold to obtain a second comparison result, including: The gas flow rate is compared with a preset lower limit value to obtain the lower limit comparison result. The dissolved oxygen content is compared with a preset lower limit value for oxygen content to obtain the lower limit comparison result for oxygen content. The comparison results of the lower limit of flow rate and the lower limit of oxygen content are used as the second comparison results.

9. The two-stage degassing device according to claim 8, characterized in that, Based on the second comparison result, the judgment result of the secondary shutdown condition is determined, including: If the flow rate lower limit comparison result in the second comparison result satisfies the gas flow rate being lower than the flow rate lower limit value, and the dissolved oxygen content lower limit comparison result in the second comparison result satisfies the dissolved oxygen content being lower than the oxygen content lower limit value, then the secondary shutdown condition judgment result is determined to meet the secondary shutdown condition. If the flow rate lower limit comparison result in the second comparison result satisfies the gas flow rate being greater than or equal to the flow rate lower limit value, and / or the oxygen content lower limit comparison result in the second comparison result satisfies the dissolved oxygen content being greater than or equal to the dissolved oxygen content lower limit value, then the result of the secondary shutdown condition judgment is determined to be that the secondary shutdown condition is not met.

10. An energy-saving operation control method, characterized in that, Based on the two-stage degassing apparatus as described in any one of claims 1 to 9, the method comprises: The free gas in the circulating water is basically removed through the first-stage degassing unit, and the circulating water after the first-stage degassing is output. The circulating water monitoring data is collected and sent to the control system. The control system uses the circulating water monitoring data to determine the secondary start-stop conditions according to a preset threshold comparison strategy, obtains the secondary start-stop condition determination results, and controls the start-stop status of the secondary degassing unit based on the secondary start-stop condition determination results. The residual free gas and dissolved oxygen in the circulating water after the first stage of degassing are deeply removed in a vacuum environment through a two-stage degassing unit.

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