Water level regulation control system applied to power frequency and variable frequency working conditions of condensation water system
By introducing bypass pipelines and bypass regulating valves into the condensate water system, the throttling loss problem of the condensate water pump during operation of the power frequency and variable frequency is solved, and energy consumption is reduced and system reliability is improved.
Patent Information
- Application Number
- CN202421764856.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-24
AI Technical Summary
In the condensate system, the condensate pump has a large throttling loss during operation of the power frequency and variable frequency, resulting in an increase in energy consumption and it is difficult to repair the deaerator water level bypass regulating valve in time when there is a problem with the deaerator water level bypass regulating valve.
A water level adjustment control system is designed, including condenser, deaerator, condensate pipe, condensate pump, deaerator water level main regulating valve and bypass pipeline. The deaerator water level bypass control valve on the bypass pipeline reduces throttling losses during frequency conversion operation, and disconnects the bypass pipeline when the bypass control valve fails for inspection.
It reduces the energy consumption of the condensate pump, ensures the normal operation of the system when the bypass regulating valve fails, and improves the reliability and economicality of the system.
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Figure CN223178820U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of steam turbine condensate water, and particularly to a water level regulating control system applied to the power frequency and variable frequency conditions of a condensate water system. Background Art
[0002] The condensate water system can pressurize the condensate water through a condensate pump, enable it to enter the deaerator, and control the water level in the deaerator, so as to facilitate the water in the subsequent deaerator to return to the boiler for continued use, and thus achieve the purpose of recycling the condensate water.
[0003] Among them, when the condensate pump operates at power frequency, the water level in the deaerator is controlled by the main deaerator water level regulating valve; when the condensate pump operates at variable frequency, the regulating valve in the upper water pipeline is in the fully open state, and the water level in the deaerator is adjusted by the speed of the condensate pump. Even so, there is still a large throttling loss in the pipeline, which increases the energy consumption of the condensate pump. Utility Model Content
[0004] The purpose of the present disclosure is to provide a water level regulating control system applied to the power frequency and variable frequency conditions of a condensate water system, so as to be able to reduce the throttling loss and perform maintenance in a timely manner when problems occur in the deaerator water level bypass regulating valve.
[0005] To achieve the above object, the present disclosure provides a water level regulating control system applied to the power frequency and variable frequency conditions of a condensate water system, including: a condenser; a deaerator; a condensate water pipeline, connected between the condenser and the deaerator; a condensate pump, arranged on the condensate water pipeline; a main deaerator water level regulating valve, the main deaerator water level regulating valve is arranged on the condensate water pipeline and downstream of the condensate pump; a bypass pipeline, parallel to the main deaerator water level regulating valve; a deaerator water level bypass regulating valve, arranged on the bypass pipeline, for reducing the throttling loss of the condensate water flowing through the main deaerator water level regulating valve when opened; two first isolation valves, arranged on the bypass pipeline and respectively on both sides of the deaerator water level bypass regulating valve.
[0006] Optionally, there are two main deaerator water level regulating valves, arranged in parallel on the condensate water pipeline.
[0007] Optionally, second isolation valves are arranged on both sides of the main deaerator water level regulating valve, and the second isolation valves are located between the two connection points of the bypass pipeline and the condensate water pipeline.
[0008] Optionally, the first isolation valve and the second isolation valve are configured as electric gate valves.
[0009] Optionally, the main deaerator water level regulating valve is configured as a regulating valve with a converging-diverging diameter at the front and rear interfaces.
[0010] Optionally, the deaerator water level bypass regulating valve is configured as a direct-through regulating valve.
[0011] Optionally, the condensate pump is configured as a multi-stage centrifugal pump.
[0012] Optionally, the condenser is provided with a hot well to collect the condensate in the condenser.
[0013] Optionally, the water level regulating control system further includes a low-pressure heater provided on the condensate pipeline, and the low-pressure heater is located downstream of the main deaerator water level regulating valve and the bypass pipeline.
[0014] Optionally, a condensate pump recirculation loop is further provided between the condenser and the outlet header of the condensate pump.
[0015] By the above technical solution, when the condensate pump of the present disclosure is in a variable-frequency operation mode to regulate the water level in the deaerator, the throttling loss of the condensate flowing through the main deaerator water level regulating valve can be reduced by opening the deaerator water level bypass regulating valve on the bypass pipeline, thereby reducing the energy consumption of the condensate pump; in addition, when the deaerator water level bypass regulating valve fails, the bypass pipeline can be disconnected from the condensate pipeline by closing the isolation valve, so as to facilitate the maintenance of the deaerator water level bypass regulating valve and ensure the normal operation of the water level regulating control system.
[0016] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific implementation, but do not constitute a limitation to the present disclosure. In the drawings:
[0018] Figure 1 is a schematic diagram of a first embodiment of the water level regulating control system provided by the present disclosure;
[0019] Figure 2 is a schematic diagram of a second embodiment of the water level regulating control system provided by the present disclosure.
[0020] DESCRIPTION OF THE REFERENCE NUMERALS
[0021] 1 - Condenser; 2 - Deaerator; 3 - Condensate pipeline; 4 - Condensate pump; 5 - Main deaerator water level regulating valve; 6 - Bypass pipeline; 7 - Deaerator water level bypass regulating valve; 8 - First isolation valve; 9 - Second isolation valve; 10 - Hot well; 11 - Low-pressure heater; 12 - Condensate pump recirculation loop. DETAILED DESCRIPTION OF THE INVENTION
[0022] The following is a detailed description of the specific embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and illustrating the present disclosure, and are not used to limit the present disclosure.
[0023] In the present disclosure, unless otherwise stated, the terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another, and do not have sequentiality and importance. In addition, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure, and should not be construed as a limitation of the present disclosure.
[0024] To achieve the above object, as Figure 1 and Figure 2 shown, the present disclosure provides a water level regulation control system applied to the power frequency and variable frequency conditions of a condensate system, including: a condenser 1, a deaerator 2, a condensate pipeline 3, a condensate pump 4, a main deaerator water level regulating valve 5, a bypass pipeline 6, and two first isolation valves 8. Among them, the condensate pipeline 3 is connected between the condenser 1 and the deaerator 2; the condensate pump 4 is arranged on the condensate pipeline 3; the main deaerator water level regulating valve 5 is arranged on the condensate pipeline 3 and downstream of the condensate pump 4; the bypass pipeline 6 is connected in parallel with the main deaerator water level regulating valve 5; a deaerator water level bypass regulating valve 7 is arranged on the bypass pipeline 6 to reduce the throttling loss of the condensate flowing through the main deaerator water level regulating valve 5 when it is opened; one of the two first isolation valves 8 can be upstream of the deaerator water level bypass regulating valve 7 and the other can be downstream of the deaerator water level bypass regulating valve 7, that is, the two first isolation valves 8 are respectively arranged on the bypass pipeline 6 and on both sides of the deaerator water level bypass regulating valve 7. When the condensate system adjusts the water level of the deaerator 2, it has two adjustment modes: power frequency and variable frequency. When the condensate pump 4 is in the power frequency operation mode, the deaerator water level bypass regulating valve 7 is in the closed state, and the water level in the deaerator 2 is controlled by adjusting the opening degree of the main deaerator water level regulating valve 5. At this time, the bypass pipeline 6 can be used as an emergency pipeline; when the condensate pump 4 is in the variable frequency operation mode, the main deaerator water level regulating valve 5 is in the open state. Among them, when the load rate of the steam turbine unit is lower than the preset load rate, the deaerator water level bypass regulating valve 7 is in the closed state, and when the load rate of the steam turbine unit is higher than the preset load rate, the deaerator water level bypass regulating valve 7 is in a gradually opening state, thereby reducing the throttling loss of the condensate flowing through the main deaerator water level regulating valve 5; in addition, if the deaerator water level bypass regulating valve 7 fails, the first isolation valves 8 on both sides of it can be closed to disconnect the bypass pipeline 6 from the condensate pipeline 3. At this time, the main deaerator water level regulating valve 5 is still in the open state, so that the deaerator water level bypass regulating valve 7 can be repaired, and the condensate system can still operate normally.
[0025] Under normal circumstances, the preset load value can be set to 50%. That is, when the load rate of the steam turbine unit is lower than 50%, the deaerator water level bypass regulating valve 7 is in the closed state; when the load rate of the steam turbine unit is higher than 50%, the deaerator water level bypass regulating valve 7 opens, and the opening amplitude increases with the increase of the load rate of the steam turbine unit. When the load rate of the steam turbine unit is 80% of the rated load, the deaerator water level bypass regulating valve 7 is in the fully open state.
[0026] Among them, in order to ensure that the water in the condensate pipeline 3 can smoothly enter the deaerator 2, the flow rate of the bypass pipeline 6 is 100% of the flow rate of the condensate pipeline 3.
[0027] In the embodiments of the present disclosure, as Figure 2 shown, there are two main deaerator water level regulating valves 5, which are arranged in parallel on the condensate pipeline 3. The regulating pipeline formed by the two pipelines where the two main deaerator water level regulating valves 5 are located together is 100% of the flow rate of the condensate pipeline 3. For example, the pipeline where one main deaerator water level regulating valve 5 is located is 30% of the flow rate of the condensate pipeline 3, and the pipeline where the other main deaerator water level regulating valve 5 is located is 70% of the flow rate of the condensate pipeline 3, so as to facilitate the adjustment of the flow rate of the condensate passing through the main deaerator water level regulating valve 5, and further improve the accuracy of adjusting the water level in the deaerator 2.
[0028] In addition, as Figure 1 and Figure 2 shown, in order to facilitate the maintenance and replacement of the main deaerator water level regulating valve 5, a second isolation valve 9 can also be provided on both sides of the main deaerator water level regulating valve 5, which is located between the two connection points of the bypass pipeline 6 and the condensate pipeline 3. In this way, when the main deaerator water level regulating valve 5 has problems, closing the second isolation valve 9 can perform maintenance and replacement on the main deaerator water level regulating valve 5.
[0029] In some embodiments, as Figure 1 and Figure 2 shown, the first isolation valve 8 and the second isolation valve 9 are configured as electric gate valves, so that the staff can directly remotely control the opening and closing of the stop valve through the control system, thus simply and efficiently completing the control of the first isolation valve 8 and the second isolation valve 9.
[0030] In the embodiments of the present disclosure, as Figure 1 and <� Figure 2 shown, the main deaerator water level regulating valve 5 can be configured as a regulating valve with reduced and enlarged diameters at the front and rear interfaces to improve the control accuracy of the condensate flow rate. In order to further reduce the throttling loss of the condensate system, the deaerator water level bypass regulating valve 7 can be selected as a regulating valve with straight-through type at the front and rear interfaces.
[0031] In addition, to ensure the working efficiency of the condensate system and improve reliability, the condensate pump 4 is configured as a multistage centrifugal pump.
[0032] Among them, as Figure 1 and Figure 2 shown, the condenser 1 is provided with a hot well 10 to collect the condensate in the condenser 1. The hot well 10 can collect the condensate in the condenser 1 and monitor the water level in the condenser 1, so as to ensure the normal operation of the condensate system while preventing the condensate from being supercooled or the vacuum from dropping due to the too high water level in the condenser 1, which affects the safe and economic operation.
[0033] In addition, as Figure 1 and Figure 2 shown, the water level regulation control system further includes a low-pressure heater 11 provided on the condensate pipeline 3. The low-pressure heater 11 is located downstream of the main deaerator water level regulating valve 5 and the bypass pipeline 6. The low-pressure heater 11 can heat the condensate to the required temperature, reduce energy loss, and thus improve the overall economy of the steam turbine unit.
[0034] In some embodiments of the present disclosure, as Figure 1 and Figure 2 shown, a condensate pump recirculation loop 12 is provided between the condenser 1 and the outlet header of the condensate pump 4. Thus, when the condensate flow rate is lower than the minimum protection flow rate, the regulating valve in the condensate pump recirculation loop 12 can be quickly opened to avoid low-flow cavitation of the condensate pump 4 and ensure the safe operation of the condensate pump 4.
[0035] In summary, the working principle of the present disclosure is as follows: After the condensed water in the condenser 1 is collected in the hot well 10, the condensate pump 4 on the condensate pipeline 3 sends the condensed water into the deaerator 2. During this process, when the condensate pump 4 operates in the power frequency mode, the opening degree of the main deaerator water level regulating valve 5 regulates the flow rate and water level of the condensed water entering the deaerator 2. At this time, the bypass pipeline 6 is used as an emergency pipeline and is opened in time when the main deaerator water level regulating valve 5 has problems to ensure the normal operation of the condensate water system. When the condensate pump 4 operates in the variable frequency mode, the main deaerator water level regulating valve 5 and the first isolation valve 8 on the bypass pipeline 6 are adjusted to the fully open state. If the load rate of the steam turbine unit is lower than 50%, the bypass deaerator water level regulating valve 7 is in the closed state. If the load rate of the steam turbine unit is higher than 50%, the bypass deaerator water level regulating valve 7 opens, and the opening amplitude increases with the increase of the load rate of the steam turbine unit. When the load rate of the steam turbine unit is 80% of the rated load, the bypass deaerator water level regulating valve 7 is in the fully open state, so as to reduce the throttling loss generated when the condensate pipeline 3 passes through the main deaerator water level regulating valve 5. In addition, when the bypass deaerator water level regulating valve 7 fails, the bypass pipeline 6 can be disconnected from the condensate pipeline 3 by closing the first isolation valve 8, so as to facilitate the maintenance and replacement of the bypass deaerator water level regulating valve 7 and ensure the normal operation of the condensate water system. After the condensed water passes through the main deaerator water level regulating valve 5 or the bypass deaerator water level regulating valve 7, it enters the low-pressure heater 11, and after being heated to the specified temperature by the low-pressure heater 11, it is then transported to the deaerator 2 again.
[0036] Among them, two condensate pumps 4 can be provided, and the two condensate pumps 4 are arranged in parallel and operate in a one-running-one-standby mode. In this way, when one of the condensate pumps 4 has problems, the other condensate pump 4 can be used as a standby pump to ensure the normal operation of the condensate water system.
[0037] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0038] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.
[0039] In addition, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.
Claims
1. A water level regulation control system applied to the power frequency and variable frequency conditions of the condensate system, characterized in that, Comprising: Condenser; Deaerator; Condensate pipeline, connected between the condenser and the deaerator; Condensate pump, arranged on the condensate pipeline; Main regulating valve for deaerator water level, the main regulating valve for deaerator water level is arranged on the condensate pipeline and downstream of the condensate pump; Bypass pipeline, in parallel with the main regulating valve for deaerator water level; Bypass regulating valve for deaerator water level, arranged on the bypass pipeline for reducing the throttling loss of the condensate flowing through the main regulating valve for deaerator water level when opened; Two first isolation valves, arranged on the bypass pipeline and respectively on both sides of the bypass regulating valve for deaerator water level.
2. The water level adjustment control system according to claim 1, characterized in that There are two main regulating valves for deaerator water level, arranged in parallel on the condensate pipeline.
3. The water level adjustment control system according to claim 2, characterized in that Second isolation valves are arranged on both sides of the two main regulating valves for deaerator water level, and the second isolation valves are located between the two connection points of the bypass pipeline and the condensate pipeline.
4. The water level regulation control system according to claim 3, wherein, The first isolation valve and the second isolation valve are configured as electric gate valves.
5. The water level adjustment control system according to claim 1, characterized in that, The main regulating valve for deaerator water level is configured as a regulating valve with converging-diverging diameters at the front and rear interfaces.
6. The water level adjustment control system according to claim 1, characterized in that The bypass regulating valve for deaerator water level is configured as a regulating valve with straight-through interfaces at the front and rear.
7. The water level regulation control system according to claim 1, characterized in that, The condensate pump is configured as a multistage centrifugal pump.
8. The water level adjustment control system according to claim 1, characterized in that The condenser is provided with a hot well for collecting the condensate in the condenser.
9. The water level adjustment control system according to claim 1, wherein, The condensate system further includes a low-pressure heater arranged on the condensate pipeline, and the low-pressure heater is located downstream of the main regulating valve for deaerator water level and the bypass pipeline.
10. The water level adjustment control system according to claim 9, characterized in that, A condensate pump recirculation loop is provided between the condenser and the outlet header of the condensate pump.