A power plant condensate water system water level control system

Abstract

The application discloses a power plant condensate water system water level control system, which comprises a condenser shell, a steam inlet arranged on the upper portion of the condenser shell and used for steam entering, a gas flow meter arranged at the steam inlet and used for actually detecting the flow of the steam, a hot well arranged below the condenser shell and used for collecting condensate water, a liquid level meter arranged on the lateral wall of the hot well and used for detecting the water level height of the condensate water, a condensate water pump connected with the hot well and used for discharging the condensate water, a water supplement unit connected with the hot well and used for supplementing water to the hot well, and a control unit arranged on the outer lateral wall of the condenser shell and used for controlling the condensate water pump and the water supplement unit. The application can accurately control the working conditions of the condensate water pump and the water supplement unit according to the steam flow in the condenser and the liquid level in the hot well, solves the problem of the hot well water level of the condenser, avoids the situation that the liquid level is too high or too low to a dangerous degree, maintains the water level in the hot well in a safe range, and thus guarantees the normal operation of the unit.

Description

Technical Field

[0001] This invention relates to the field of water level control technology, and in particular to a water level control system for a power plant condensate system. Background Technology

[0002] The condensate system, typically a crucial component of the unit's steam-water circulation, primarily transports condensate from the condenser hot well to the deaerator. It is divided into two types: water-cooled condensers and air-cooled condensers. Besides condensing turbine exhaust steam into water for boiler reuse, the condenser also establishes and maintains a vacuum at the turbine exhaust. As a condensing device, the condenser's operating condition determines the unit's thermal economy and operational reliability.

[0003] A hot well is a condensate collection well located at the bottom of the condenser, and is a vertical cylindrical component installed at the bottom of a surface condenser of a steam turbine. It is used to collect the main condensate generated by the continuous condensation of a large amount of exhaust steam.

[0004] The main function of the condensate pump is to work with the ejector to create a vacuum, forming a vacuum between the circulating water and steam. This facilitates water transport and saves a lot of energy, because deaerators are usually located at a high position, and without a condensate pump to create a vacuum, it would be very difficult to operate. The water circulates through the circulating water pump and the circulating water tank, and finally returns to the deaerator, thus completing the cycle. In actual power generation operation, the hot well water level is a crucial parameter for ensuring its normal operation. If the hot well water level is higher than the condenser air cooling zone and the evacuation pipes, air cannot be extracted from the condenser, preventing timely condensation of the exhaust steam from the low-pressure cylinder. In severe cases, it can submerge some copper tubes, reducing the condenser's heat exchange area and causing the unit's vacuum system to malfunction, leading to a drop in vacuum and unit tripping. Therefore, a high hot well water level significantly impacts the unit's vacuum. Conversely, a low hot well water level can easily cause condensate pump cavitation, potentially leading to condensate pump tripping. This can further result in a low deaerator water level, and in severe cases, feedwater pump vaporization, affecting normal boiler feedwater supply and jeopardizing unit operational safety. Therefore, ensuring a normal water level in the hot well is an urgent problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this invention is that existing transformer substation monitoring and control devices cannot accurately control the occurrence of high temperature, high humidity and smoke inside the transformer box.

[0006] To solve the above-mentioned technical problems, the present invention provides a water level control system for a power plant condensate system, comprising:

[0007] Condenser shell;

[0008] A steam inlet is located on the upper part of the condenser shell to allow steam to enter the condenser.

[0009] A gas flow meter is installed at the steam inlet to detect the flow rate of steam entering the condenser in real time.

[0010] A hot well, located below the condenser shell, is used to collect condensate.

[0011] A level gauge is installed on the side wall of the hot well to detect the water level of the condensate collected in the hot well in real time.

[0012] A condensate pump, connected to the hot well, is used to drain the condensate from the hot well;

[0013] A water supply unit, connected to the hot well, is used to supply water to the hot well;

[0014] The control unit is located on the outer wall of the condenser shell and is used to control the operation of the condensate pump and the water supply unit.

[0015] Furthermore, the water replenishment unit includes:

[0016] Water supply tank, used to store the supplied water;

[0017] A water supply pump is used to deliver water.

[0018] The control unit includes:

[0019] The data acquisition module is connected to the gas flow meter and the liquid level gauge respectively, and is used to acquire the detected flow rate and liquid level information data;

[0020] The processing module, connected to the acquisition module, is used to process and analyze the acquired and detected flow and liquid level information data, and to set relevant values;

[0021] The control module, connected to the processing module, is used to control the specific operating status of the condensate pump and the supply water pump based on the processing and analysis results.

[0022] Furthermore, the processing module is used to set the high water level value S0 of the hot well, the acquisition module is used to acquire the water level value ΔS of the first hot well in real time, and the processing module is also used to determine whether the real-time acquired water level value ΔS of the first hot well is greater than the high water level value S0 of the hot well, and based on the determination result, to determine whether to adjust the pumping volume ΔL of the condensate pump:

[0023] When △S≤S0, the pumping capacity △L of the condensate pump is not adjusted;

[0024] When △S>S0, the pumping capacity △L of the condensate pump is adjusted.

[0025] Furthermore, when ΔS > S0, and the pumping rate ΔL of the condensate pump is adjusted, the acquisition module is used to acquire the water level value ΔS of the first hot well in real time, and adjust ΔL according to ΔS, wherein...

[0026] The processing module is used to preset the water level values ​​S1, S2, S3, and S4 of the first preset first hot well, and S0 < S1 < S2 < S3 < S4; the processing module is also used to preset the pumping volume adjustment coefficient x1, x2, x3, and x4 of the first preset condensate pump, and 1 < x1 < x2 < x3 < x4 < 1.3;

[0027] The pumping rate of the condensate pump is adjusted according to the relationship between the real-time water level value ΔS of the first hot well and the preset water level value Si of each first hot well:

[0028] When S1<△S≤S2, the pumping volume adjustment coefficient x1 of the first preset condensate pump is selected to adjust the pumping volume of the condensate pump. The adjusted pumping volume of the condensate pump is △L*x1.

[0029] When S2<△S≤S3, the pumping volume adjustment coefficient x2 of the second preset condensate pump is selected to adjust the pumping volume of the condensate pump. The adjusted pumping volume of the condensate pump is △L*x2.

[0030] When S3<△S≤S4, the pumping volume adjustment coefficient x3 of the third preset condensate pump is selected to adjust the pumping volume of the condensate pump. The adjusted pumping volume of the condensate pump is △L*x3.

[0031] When S4 < △S, the pumping capacity adjustment coefficient x4 of the fourth preset condensate pump is selected to adjust the pumping capacity of the condensate pump. The adjusted pumping capacity of the condensate pump is △L*x4.

[0032] Furthermore, after selecting the pumping rate adjustment coefficient xi of the i-th preset condensate pump to adjust the pumping rate of the condensate pump, and obtaining the adjusted pumping rate of the condensate pump as ΔL*xi, where i = 1, 2, 3, 4, including:

[0033] The acquisition module is used to acquire the first steam flow rate ΔA entering the condenser in real time.

[0034] The processing module is used to preset a first steam flow rate A1, a second preset first steam flow rate A2, a third preset first steam flow rate A3, and a fourth preset first steam flow rate A4, where A1 < A2 < A3 < A4; the processing module is also used to preset a first preset correction coefficient y1, a second preset correction coefficient y2, a third preset correction coefficient y3, and a fourth preset correction coefficient y4, where 1 < y1 < y2 < y3 < y4 < 1.3;

[0035] The pumping rate of the adjusted real-time condensate pump, ΔL*xi, is corrected based on the relationship between the real-time steam flow rate ΔA entering the condenser and each preset steam flow rate Ai.

[0036] When △A≤A1, the pumping capacity △L*xi of the condensate pump is not corrected;

[0037] When A1 < △A ≤ A2, the first preset correction coefficient y1 is selected to correct the pumping volume △L*xi of the condensate pump. The corrected real-time pumping volume of the condensate pump is △L*xi*y1.

[0038] When A2 < △A ≤ A3, the second preset correction coefficient y2 is selected to correct the pumping capacity △L*xi of the condensate pump. The corrected pumping capacity of the condensate pump is △L*xi*y2.

[0039] When A3 < △A ≤ A4, the third preset correction coefficient y3 is selected to correct the pumping capacity △L*xi of the condensate pump. The corrected pumping capacity of the condensate pump is △L*xi*y3.

[0040] When A4 < △A, the fourth preset correction coefficient y4 is selected to correct the pumping capacity △L*xi of the condensate pump. The corrected pumping capacity of the condensate pump is △L*xi*y4.

[0041] Furthermore, the processing module is used to set the low water level value B of the hot well, the acquisition module is used to acquire the water level value ΔB of the second hot well in real time, and the processing module is also used to determine whether the real-time acquired water level value ΔB of the second hot well is less than the low water level value B of the hot well, and based on the determination result, to determine whether to adjust the water supply volume ΔL of the supply pump.

[0042] When △B≥B, the water supply pump does not work;

[0043] When ΔB < B, the water supply pump is turned on, the water supply volume ΔL of the water supply pump is adjusted, and the condensate pump is stopped.

[0044] Furthermore, the acquisition module is used to acquire the water level value ΔB of the second hot well in real time. The acquisition module is also used to set the water level value B0 of the second hot well, where B0 < B. The processing module is also used to set the first preset water level difference b1, the second preset water level difference b2, the third preset water level difference b3, and the fourth preset water level difference b4 of the second hot well, where b1 < b2 < b3 < b4. The processing module is also used to set the first preset working condition M1, the second preset working condition M2, the third preset working condition M3, and the fourth preset working condition M4, where M1 to M4 are the first to fourth preset water supply volumes, respectively, where M1 < M2 < M3 < M4.

[0045] The preset water supply volume M is selected as the water supply volume of the water supply pump based on the difference between the water level value ΔB of the second hot well and the set water level value B0 of the second hot well.

[0046] When B0-△B≤b1, the first preset water supply M1 is selected as the water supply volume of the water supply pump;

[0047] When b1 < △B - B0 ≤ b2, the second preset water supply volume M2 is selected as the water supply volume of the water supply pump;

[0048] When b2 < △B - B0 ≤ b3, the third preset water supply M3 is selected as the water supply of the drying device;

[0049] When b3 < △B - B0 ≤ b4, the fourth preset water supply M4 is selected as the water supply volume of the water supply pump.

[0050] Furthermore, the acquisition module is used to acquire the second steam flow rate ΔN entering the condenser in real time, and the processing module is used to set a first preset second steam flow rate N1, a second preset second steam flow rate N2, a third preset second steam flow rate N3, and a fourth preset second steam flow rate N4, where N1 < N2 < N3 < N4; the acquisition module is also used to set a first preset correction coefficient m1, a second preset correction coefficient m2, a third preset correction coefficient m3, and a fourth preset correction coefficient m4, where 1 > m1 > m2 > m3 > m4 > 0.9;

[0051] The acquisition module is also used to acquire the second steam flow rate ΔT in real time. Furthermore, when the i-th preset operating condition matrix Mi is selected as the operating condition of the cooling device, the acquisition module selects a preset correction coefficient based on the relationship between the real-time second steam flow rate ΔT and each preset second steam flow rate T to correct the operating conditions in the i-th preset operating condition Mi.

[0052] When △T≤T1, the working conditions in the i-th preset working condition Mi are not modified;

[0053] When T1 < △T ≤ T2, the first preset correction coefficient m1 is selected to correct Mi, and the corrected value is Mi * m1.

[0054] When T2 < △T ≤ T3, the second preset correction coefficient m2 is selected to correct Mi, and the corrected value is Mi * m2.

[0055] When T3 < △T ≤ T4, the third preset correction coefficient m3 is selected to correct Mi, and the corrected value is Mi * m3.

[0056] When T4 < △T, the fourth preset correction coefficient m4 is selected to correct Mi, and the corrected value is Mi * m4.

[0057] Compared with the prior art, the water level control system for a power plant condensate system according to an embodiment of the present invention has the following advantages:

[0058] This invention solves the problem of condensate pump and water supply unit operation by precisely controlling the steam flow rate in the condenser and the liquid level in the hot well. It avoids dangerous situations where the liquid level is too high or too low, and keeps the water level in the hot well within a safe range, thereby ensuring the normal operation of the unit. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of the power plant condensate system water level control system in an embodiment of the present invention;

[0060] Figure 2 This is a schematic diagram of the water replenishment unit structure of the power plant condensate system water level control system in an embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of the control unit structure of the power plant condensate system water level control system in an embodiment of the present invention;

[0062] Figure 4 This is a schematic diagram of the data acquisition module connection in an embodiment of the power plant condensate system water level control system.

[0063] Figure 5 This is a schematic diagram of the connection of the control module of the power plant condensate system water level control system in an embodiment of the present invention.

[0064] In the diagram, 1 is the condenser shell; 2 is the steam inlet; 3 is the gas flow meter; 4 is the hot well; 5 is the level gauge; 6 is the condensate pump; 7 is the water supply unit; 8 is the control unit; 9 is the water supply tank; and 10 is the water supply pump. Detailed Implementation

[0065] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0066] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0067] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0069] like Figure 1 As shown in the embodiments of this application, a power plant condensate system water level control system is provided, including: a condenser shell 1, a steam inlet 2, a gas flow meter 3, a hot well 4, a level gauge 5, a condensate pump 6, a water supply unit 7, and a control unit 8; the condenser shell 1 is a hollow shell structure, which allows steam to condense inside; the steam inlet 2 is located on the upper part of the condenser shell 1 to allow steam to enter the condenser; the gas flow meter 3 is located at the steam inlet 2 to detect the amount of steam entering the condenser in real time. The steam flow rate; the hot well 4 is located below the condenser shell 1 and is used to collect condensate; the level gauge 5 is located on the side wall of the hot well 4 and is used to detect the water level of the condensate collected in the hot well 4 in real time; the condensate pump 6 is connected to the hot well 4 and is used to discharge the condensate in the hot well 4; the water replenishment unit 7 is connected to the hot well 4 and is used to replenish water to the hot well 4; the control unit 8 is located on the outer side wall of the condenser shell 1 and is used to control the operation of the condensate pump 6 and the water replenishment unit 7.

[0070] Furthermore, by precisely controlling the operation of the condensate pump 6 and the water supply unit 7 based on the steam flow rate in the condenser and the liquid level in the hot well 4, the problem of the water level in the condenser hot well 4 is solved, avoiding dangerous situations where the liquid level is too high or too low, thus ensuring that the water level in the hot well 4 is maintained within a safe range and guaranteeing the normal operation of the unit.

[0071] like Figure 2 As shown in the embodiments of this application, a water level control system for a power plant condensate system is provided. The water replenishment unit 7 includes: a water replenishment tank 9 and a water supply pump 10; the water replenishment tank 9 is used to store water supply; the water supply pump 10 is connected to the water replenishment tank 9 and is used to transport water supply, wherein the connection between the water replenishment units 7 is made through a delivery pipe.

[0072] Furthermore, when the liquid level in the hot well 4 is too low, the water supply pump 10 pumps water from the water replenishment tank 9 into the hot well 4, which can replenish the hot well 4 in a timely manner and keep the water level in the hot well 4 within a safe range.

[0073] like Figure 3 As shown in Figure 5, the control unit 8 includes: a data acquisition module, a processing module, and a control module; the data acquisition module is connected to the gas flow meter 3 and the liquid level gauge 5 respectively, and is used to acquire the detected flow rate and liquid level information data; the processing module is connected to the data acquisition module, and is used to process and analyze the acquired flow rate and liquid level information data, and to set relevant values; the control module is connected to the processing module, and is used to control the specific working state of the condensate pump 6 and the water supply pump 10 according to the processing and analysis results.

[0074] In an embodiment of this application, a condensate system water level control system for a power plant is provided. The processing module is used to set the high water level value S0 of the hot well 4, and the acquisition module is used to acquire the water level value ΔS of the first hot well 4 in real time. The processing module is also used to determine whether the real-time acquired water level value ΔS of the first hot well 4 is greater than the high water level value S0 of the hot well 4, and based on the determination result, to determine whether to adjust the pumping rate ΔL of the condensate pump 6.

[0075] When △S≤S0, the pumping volume △L of the condensate pump 6 is not adjusted;

[0076] When △S>S0, the pumping volume △L of the condensate pump 6 is adjusted.

[0077] Furthermore, when the water level in the hot well 4 reaches a certain level, some copper pipes are submerged, reducing the heat exchange area of ​​the condenser and affecting the unit's vacuum. When the liquid level exceeds the warning value, water will enter the turbine, potentially causing serious equipment damage. The impact of water will also cause damage to the blades, friction between moving and stationary parts, cylinder cracks or permanent deformation, and damage to the thrust bearing. Therefore, by setting a high water level value, the adjustment scheme is activated when the water level in the hot well 4 exceeds this value, to avoid the water level being too high and affecting the normal operation of the unit.

[0078] In an embodiment of this application, a water level control system for a power plant condensate system is provided. When ΔS > S0, and the pumping rate ΔL of the condensate pump 6 is adjusted, the acquisition module is used to acquire the water level value ΔS of the first hot well 4 in real time, and adjust ΔL according to ΔS.

[0079] The processing module is used to preset the water level values ​​S1, S2, S3, and S4 of the first preset first hot well 4, and S0 < S1 < S2 < S3 < S4; the processing module is also used to preset the pumping volume adjustment coefficient X1, X2, X3, and X4 of the first preset condensate pump 6, and 1 < X1 < X2 < X3 < X4 < 1.3;

[0080] The pumping rate of the condensate pump 6 is adjusted according to the relationship between the real-time water level value ΔS of the first hot well 4 and the preset water level value SI of each first hot well 4:

[0081] When S1<△S≤S2, the pumping volume adjustment coefficient X1 of the first preset condensate pump 6 is selected to adjust the pumping volume of the condensate pump 6. The adjusted pumping volume of the condensate pump 6 is △L*X1.

[0082] When S2<△S≤S3, the pumping volume adjustment coefficient X2 of the second preset condensate pump 6 is selected to adjust the pumping volume of the condensate pump 6. The adjusted pumping volume of the condensate pump 6 is △L*X2.

[0083] When S3<△S≤S4, the pumping volume adjustment coefficient X3 of the third preset condensate pump 6 is selected to adjust the pumping volume of the condensate pump 6. The adjusted pumping volume of the condensate pump 6 is △L*X3.

[0084] When S4 < △S, the pumping volume adjustment coefficient X4 of the fourth preset condensate pump 6 is selected to adjust the pumping volume of the condensate pump 6. The adjusted pumping volume of the condensate pump 6 is △L*X4.

[0085] Furthermore, the pumping volume of the condensate pump 6 is adjusted based on the relationship between the real-time collected water level value of the first hot well 4 and the preset water level values ​​of each first hot well 4, so that the water level in the hot well 4 does not exceed the maximum safe value. The pumping volume of the condensate pump 6 is precisely controlled by the water level coverage, which can accurately adjust the entire pumping process and ensure the safe operation of the unit while reducing energy consumption.

[0086] In an embodiment of this application, a condensate system water level control system for a power plant is provided. After selecting a preset condensate pumping rate adjustment coefficient XI to adjust the pumping rate of the condensate pump 6, and obtaining the adjusted real-time pumping rate of the condensate pump 6 as ΔL*XI, where I = 1, 2, 3, 4, the system includes:

[0087] The acquisition module is used to acquire the first steam flow rate ΔA entering the condenser in real time.

[0088] The processing module is used to preset a first steam flow rate A1, a second preset first steam flow rate A2, a third preset first steam flow rate A3, and a fourth preset first steam flow rate A4, where A1 < A2 < A3 < A4; the processing module is also used to preset a first preset correction coefficient Y1, a second preset correction coefficient Y2, a third preset correction coefficient Y3, and a fourth preset correction coefficient Y4, where 1 < Y1 < Y2 < Y3 < Y4 < 1.3;

[0089] The pumping capacity of the condensate pump 6 is corrected to ΔL*XI based on the relationship between the real-time steam flow rate ΔA entering the condenser and the preset steam flow rates AI.

[0090] When △A≤A1, the pumping volume △L*XI of condensate pump 6 is not corrected;

[0091] When A1 < △A ≤ A2, the first preset correction coefficient Y1 is selected to correct the pumping volume △L*XI of the condensate pump 6. The corrected real-time pumping volume of the condensate pump 6 is △L*XI*Y1.

[0092] When A2 < △A ≤ A3, the second preset correction coefficient Y2 is selected to correct the pumping volume △L*XI of the condensate pump 6. The corrected pumping volume of the condensate pump 6 is △L*XI*Y2.

[0093] When A3 < △A ≤ A4, the third preset correction coefficient Y3 is selected to correct the pumping volume △L*XI of the condensate pump 6. The corrected pumping volume of the condensate pump 6 is △L*XI*Y3.

[0094] When A4 < △A, the fourth preset correction coefficient Y4 is selected to correct the pumping volume △L*XI of the condensate pump 6. The corrected pumping volume of the condensate pump 6 is △L*XI*Y4.

[0095] Furthermore, since the steam flow rate entering the condenser also affects the water level in the hot well 4, it is also necessary to adjust the pumping rate of the adjusted condensate pump 6 according to the relationship between the real-time steam flow rate entering the condenser and each preset steam flow rate, so as to ensure that the accuracy of the water level in the hot well 4 is not affected by the fluctuation of the steam flow rate entering the condenser.

[0096] In an embodiment of this application, a water level control system for a power plant condensate system is provided. The processing module is used to set a low water level value B for the water level of the second hot well 4. The acquisition module is used to acquire the water level value ΔB of the second hot well 4 in real time. The processing module is also used to determine whether the real-time acquired water level value ΔB of the second hot well 4 is less than the low water level value B of the hot well 4, and based on the determination result, to determine whether to adjust the water supply volume ΔL of the water supply pump 10.

[0097] When △B≥B, the water supply pump 10 does not work;

[0098] When ΔB < B, the water supply pump 10 is turned on, the water supply volume ΔL of the water supply pump 10 is adjusted, and the condensate pump 6 is stopped.

[0099] Furthermore, when the water level in the hot well 4 drops to a certain level, the condensate pump 6 will be cavitated and unable to pump water. The water level in the deaerator cannot be guaranteed, which will cause the unit to shut down. Therefore, by setting a low water level value for the hot well 4, the water level in the hot well 4 will not fall below the minimum safe value. Once it falls below the low water level value, the water replenishment unit 7 will replenish water into the hot well 4 to avoid the occurrence of danger.

[0100] In an embodiment of this application, a water level control system for a power plant condensate system is provided. The acquisition module is used to acquire the water level value ΔB of the second hot well 4 in real time. The acquisition module is also used to set the water level value B0 of the second hot well 4, where B0 < B. The processing module is further used to set a first preset water level difference value B1, a second preset water level difference value B2, a third preset water level difference value B3, and a fourth preset water level difference value B4 of the second hot well 4, where B1 < B2 < B3 < B4. The processing module is also used to set a first preset working condition M1, a second preset working condition M2, a third preset working condition M3, and a fourth preset working condition M4, where M1 to M4 are the first to fourth preset water supply amounts, respectively, where M1 < M2 < M3 < M4.

[0101] The preset water supply volume M is selected as the water supply volume of the water supply pump 10 based on the difference between the water level value △B of the second hot well 4 and the set water level value B0 of the second hot well 4.

[0102] When B0-△B≤B1, the first preset water supply volume M1 is selected as the water supply volume of the water supply pump 10;

[0103] When B1 < △B - B0 ≤ B2, the second preset water supply volume M2 is selected as the water supply volume of the water supply pump 10.

[0104] When B2 < △B - B0 ≤ B3, the third preset water supply M3 is selected as the water supply of the drying device;

[0105] When B3 < △B - B0 ≤ B4, the fourth preset water supply M4 is selected as the water supply volume of the water supply pump 10.

[0106] Furthermore, the water supply volume of the water pump 10 is selected based on the difference between the water level value of the second hot well 4 and the set water level value of the second hot well 4, so as to accurately adjust the amount of water supply and prevent the water level in the hot well 4 from exceeding the preset value, thereby avoiding the need for adjustment after the water level in the hot well 4 becomes too high and reducing energy consumption.

[0107] In an embodiment of this application, a condensate system water level control system for a power plant is provided. The acquisition module is used to acquire the second steam flow rate ΔN entering the condenser in real time. The processing module is used to set a first preset second steam flow rate N1, a second preset second steam flow rate N2, a third preset second steam flow rate N3, and a fourth preset second steam flow rate N4, where N1 < N2 < N3 < N4. The acquisition module is also used to set a first preset correction coefficient M1, a second preset correction coefficient M2, a third preset correction coefficient M3, and a fourth preset correction coefficient M4, where 1 > M1 > M2 > M3 > M4 > 0.9.

[0108] The acquisition module is also used to acquire the second steam flow rate ΔT in real time. Furthermore, when the first preset operating condition matrix MI is selected as the operating condition of the cooling device, the acquisition module selects a preset correction coefficient based on the relationship between the real-time second steam flow rate ΔT and each preset second steam flow rate T to correct the operating conditions in the first preset operating condition MI.

[0109] When △T≤T1, the working conditions in the first preset working condition MI are not modified;

[0110] When T1 < △T ≤ T2, the first preset correction coefficient M1 is selected to correct MI, and the corrected value is MI * M1;

[0111] When T2 < △T ≤ T3, the second preset correction coefficient M2 is selected to correct MI, and the corrected value is MI * M2.

[0112] When T3 < △T ≤ T4, the third preset correction coefficient M3 is selected to correct MI, and the corrected value is MI * M3.

[0113] When T4 < △T, the fourth preset correction coefficient M4 is selected to correct MI, and the corrected value is MI * M4.

[0114] Furthermore, since the steam flow rate entering the condenser also affects the water level in the hot well 4, it is also necessary to adjust the water supply of the adjusted water pump 10 according to the relationship between the real-time steam flow rate entering the condenser and each preset steam flow rate, so as to ensure that the accuracy of the water level in the hot well 4 is not affected by the fluctuation of the steam flow rate entering the condenser.

[0115] In summary, this invention provides a condensate system level control system for a power plant, comprising: a condenser shell 1; a steam inlet 2 located on the upper part of the condenser shell 1 for allowing steam to enter the condenser; a gas flow meter 3 located at the steam inlet 2 for real-time detection of the steam flow rate entering the condenser; a hot well 4 located below the condenser shell 1 for collecting condensate; a level gauge 5 located on the side wall of the hot well 4 for real-time detection of the water level of the condensate collected in the hot well 4; a condensate pump 6 connected to the hot well 4 for discharging the condensate from the hot well 4; a water replenishment unit 7 connected to the hot well 4 for replenishing the hot well 4; and a control unit 8 located on the outer side wall of the condenser shell 1 for controlling the operation of the condensate pump 6 and the water replenishment unit 7. This invention solves the problem of water level in the condenser hot well 4 by precisely controlling the operation of the condensate pump 6 and the water supply unit 7 based on the steam flow rate in the condenser and the liquid level in the hot well 4. This avoids dangerous situations where the liquid level is too high or too low, and keeps the water level in the hot well 4 within a safe range, thereby ensuring the normal operation of the unit.

[0116] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water level control system for a power plant condensate system, characterized in that, include: Condenser shell; A steam inlet is located on the upper part of the condenser shell to allow steam to enter the condenser. A gas flow meter is installed at the steam inlet to detect the flow rate of steam entering the condenser in real time. A hot well, located below the condenser shell, is used to collect condensate. A level gauge is installed on the side wall of the hot well to detect the water level of the condensate collected in the hot well in real time. A condensate pump, connected to the hot well, is used to drain the condensate from the hot well; A water replenishment unit, connected to the hot well, is used to replenish water to the hot well; A control unit, located on the outer wall of the condenser shell, is used to control the operation of the condensate pump and the water supply unit. The water replenishment unit includes: Water supply tank, used to store the supplied water; A water supply pump is used to deliver water. The control unit includes: The data acquisition module is connected to the gas flow meter and the liquid level gauge respectively, and is used to acquire the detected flow rate and liquid level information data; The processing module, connected to the acquisition module, is used to process and analyze the acquired and detected flow and liquid level information data, and to set relevant values; A control module, connected to the processing module, is used to control the specific operating status of the condensate pump and the supply water pump based on the processing and analysis results. The processing module is used to set the high water level value S0 of the hot well, and the acquisition module is used to acquire the water level value ΔS of the first hot well in real time. The processing module is also used to determine whether the real-time acquired water level value ΔS of the first hot well is greater than the high water level value S0 of the hot well, and based on the determination result, to determine whether to adjust the pumping rate ΔL of the condensate pump. When △S≤S0, the pumping capacity △L of the condensate pump is not adjusted; When △S>S0, the pumping capacity △L of the condensate pump is adjusted. When ΔS > S0, and the pumping rate ΔL of the condensate pump is adjusted, the acquisition module is used to acquire the water level value ΔS of the first hot well in real time, and adjust ΔL according to ΔS, wherein... The processing module is used to preset the water level values ​​S1, S2, S3, and S4 of the first preset first hot well, and S0 < S1 < S2 < S3 < S4; the processing module is also used to preset the pumping volume adjustment coefficient x1, x2, x3, and x4 of the first preset condensate pump, and 1 < x1 < x2 < x3 < x4 < 1.3; The pumping rate of the condensate pump is adjusted according to the relationship between the real-time water level value ΔS of the first hot well and the preset water level value Si of each first hot well: When S1 < ΔS ≤ S2, the pumping capacity of the first preset condensate pump is adjusted by selecting the pumping capacity adjustment coefficient x1. The adjusted pumping capacity of the condensate pump is ΔL. x1; When S2 < ΔS ≤ S3, the pumping capacity adjustment coefficient x2 of the second preset condensate pump is selected to adjust the pumping capacity of the condensate pump. The adjusted pumping capacity of the condensate pump is ΔL. x2; When S3 < ΔS ≤ S4, the pumping capacity adjustment coefficient x3 of the third preset condensate pump is selected to adjust the pumping capacity of the condensate pump. The adjusted pumping capacity of the condensate pump is ΔL. x3; When S4 < ΔS, the pumping capacity of the fourth preset condensate pump is adjusted by selecting the pumping capacity adjustment coefficient x4, and the adjusted pumping capacity of the condensate pump is ΔL. x4; The processing module is used to set the low water level value B of the hot well, and the acquisition module is used to acquire the water level value ΔB of the second hot well in real time. The processing module is also used to determine whether the real-time acquired water level value ΔB of the second hot well is less than the low water level value B of the hot well, and based on the determination result, to determine whether to adjust the water supply volume ΔL of the supply pump. When △B≥B, the water supply pump does not work; When ΔB < B, the water supply pump is turned on, the water supply volume ΔL of the water supply pump is adjusted, and the condensate pump is stopped. The acquisition module is used to acquire the water level value ΔB of the second hot well in real time. The acquisition module is used to set the water level value B0 of the second hot well, where B0 < B. The processing module is also used to set the first preset water level difference b1, the second preset water level difference b2, the third preset water level difference b3, and the fourth preset water level difference b4 of the second hot well, where b1 < b2 < b3 < b4. The processing module is also used to set the first preset water supply M1, the second preset water supply M2, the third preset water supply M3, and the fourth preset water supply M4, where M1 to M4 are the first to fourth preset water supply, respectively, and M1 < M2 < M3 < M4. The preset water supply volume M is selected as the water supply volume of the water supply pump based on the difference between the water level value ΔB of the second hot well and the set water level value B0 of the second hot well. When B0-△B≤b1, the first preset water supply volume M1 is selected as the water supply volume of the water supply pump; When b1 < △B - B0 ≤ b2, the second preset water supply volume M2 is selected as the water supply volume of the water supply pump; When b2<△B-B0≤b3, the third preset water supply M3 is selected as the water supply volume of the water supply pump; When b3 < △B - B0 ≤ b4, the fourth preset water supply M4 is selected as the water supply volume of the water supply pump.

2. The power plant condensate system water level control system according to claim 1, characterized in that, The pumping rate of the condensate pump is adjusted by selecting the preset pumping rate adjustment coefficient xi for the i-th condensate pump, and the adjusted real-time pumping rate of the condensate pump is obtained as ΔL. After xi, i = 1, 2, 3, 4, including: The acquisition module is used to acquire the first steam flow rate ΔA entering the condenser in real time. The processing module is used to preset a first steam flow rate A1, a second preset first steam flow rate A2, a third preset first steam flow rate A3, and a fourth preset first steam flow rate A4, where A1 < A2 < A3 < A4; the processing module is also used to preset a first preset correction coefficient y1, a second preset correction coefficient y2, a third preset correction coefficient y3, and a fourth preset correction coefficient y4, where 1 < y1 < y2 < y3 < y4 < 1.3; Based on the relationship between the real-time steam flow rate ΔA entering the condenser and each preset steam flow rate Ai, the pumping capacity of the adjusted real-time condensate pump is ΔL. xi was corrected: When △A≤A1, the pumping volume △L of the condensate pump is not considered. xi was corrected; When A1 < ΔA ≤ A2, the first preset correction coefficient y1 is selected to adjust the pumping volume ΔL of the condensate pump. The xi is corrected, and the corrected pumping capacity of the real-time condensate pump is △L. xi y1; When A2 < △A ≤ A3, the second preset correction coefficient y2 is selected to adjust the pumping volume △L of the condensate pump. The xi is corrected, and the corrected pumping capacity of the condensate pump is △L. xi y2; When A3 < △A ≤ A4, the third preset correction coefficient y3 is selected to adjust the pumping volume △L of the condensate pump. The xi is corrected, and the corrected pumping capacity of the condensate pump is △L. xi y3; When A4 < △A, the fourth preset correction coefficient y4 is selected to adjust the pumping volume △L of the condensate pump. The xi is corrected, and the corrected pumping capacity of the condensate pump is △L. xi y4.

3. The power plant condensate system water level control system according to claim 1, characterized in that, The acquisition module is used to acquire the second steam flow rate ΔN entering the condenser in real time. The processing module is used to set a first preset second steam flow rate N1, a second preset second steam flow rate N2, a third preset second steam flow rate N3, and a fourth preset second steam flow rate N4, where N1 < N2 < N3 < N4. The acquisition module is also used to set a first preset correction coefficient m1, a second preset correction coefficient m2, a third preset correction coefficient m3, and a fourth preset correction coefficient m4, where 1 > m1 > m2 > m3 > m4 > 0.

9. The acquisition module is also used to acquire the second steam flow rate ΔT in real time. Furthermore, when the i-th preset water supply matrix Mi is selected as the operating condition of the water supply pump, the acquisition module selects a preset correction coefficient based on the relationship between the real-time second steam flow rate ΔT and each preset second steam flow rate T to correct the operating conditions in the i-th preset water supply matrix Mi. When △T≤T1, the working conditions in the i-th preset water supply Mi are not modified; When T1 < ΔT ≤ T2, the first preset correction coefficient m1 is selected to correct Mi, and the corrected value is Mi. m1; When T2 < ΔT ≤ T3, the second preset correction coefficient m2 is selected to correct Mi, and the corrected value is Mi. m2; When T3 < ΔT ≤ T4, the third preset correction coefficient m3 is selected to correct Mi, and the corrected value is Mi. m3; When T4 < ΔT, the fourth preset correction coefficient m4 is selected to correct Mi, and the corrected value is Mi. m4.

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