An automatic water feeding control method for a waste heat boiler drum

Abstract

The application discloses a kind of automatic water feeding control methods of waste heat boiler drum, and boiler water feeding program control is in progress, water feeding main regulating valve and water feeding bypass regulating valve are automatically put into automatic position, water feeding main regulating valve is automatically closed, the opening of water feeding bypass regulating valve is automatically controlled according to the operation condition of waste heat boiler, to match the best water feeding quantity of waste heat boiler, while controlling the wall temperature difference of waste heat boiler drum in the allowable working range of drum;When water supply side is unstable, then the opening of water feeding bypass regulating valve is automatically reduced;When water consumption side is unstable, then the opening of water feeding bypass regulating valve is automatically reduced, and the wall temperature difference of waste heat boiler drum is controlled in the allowable working range of drum;When actual water feeding flow is over high limit, water supply side parameter is over low limit or water consumption side parameter is over high limit, then water feeding bypass regulating valve is automatically locked during boiler water feeding program control, this method can realize the matching of boiler water feeding rate and current operation condition, realize the automatic control of waste heat boiler water feeding.

Description

Technical Field

[0001] This invention belongs to the field of thermal power generation control and relates to an automatic water filling control method for a waste heat boiler drum. Background Technology

[0002] Gas turbine units are often used as peak-shaving units due to their rapid start-up capability, and the daily boiler water filling workload is relatively large.

[0003] If water is added manually, a small amount of water will affect the unit's rapid start-up; a large amount of water will easily damage the inner wall of the steam drum due to the large temperature difference between the steam drum walls, and will also easily cause disturbances to the water supply system.

[0004] The default opening degree of the one-button start-up breakpoint for conventional waste heat boiler water supply is usually fixed. If the opening degree of the boiler water supply regulating valve is small, the water supply rate will be slow, affecting the rapid start-up of the unit. If the opening degree of the boiler water supply regulating valve is large, it is easy to damage the inner wall of the steam drum due to the large temperature difference of the steam drum wall, and it is also easy to cause insufficient water supply and start the standby pump on the water supply side, which will aggravate the disturbance of the water supply system. When the boiler is started under multiple operating conditions such as cold, warm and hot states, the boiler water supply rate does not match the current operating conditions.

[0005] When the waste heat boiler is initially filled with water, the water flow rate is low, and the measurement error of the water flow rate measuring equipment is large, which can easily affect the automatic control of the waste heat boiler water supply. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic water supply control method for waste heat boiler drum. This method can match the boiler water supply rate with the current operating conditions and realize automatic control of waste heat boiler water supply.

[0007] To achieve the above objectives, the automatic water supply control method for waste heat boiler drum of the present invention includes:

[0008] Once the conditions for one-button water filling of the waste heat boiler are met, the waste heat boiler will automatically fill water in stages. After the water level in the low-pressure steam drum is normal, water will be simultaneously added to the medium-pressure steam drum and the high-pressure steam drum.

[0009] During the boiler water filling process, the main feedwater control valve and the feedwater bypass control valve are automatically put into the automatic position, the main feedwater control valve is automatically closed, and the opening of the feedwater bypass control valve is automatically controlled according to the operating conditions of the waste heat boiler to match the optimal water filling volume of the waste heat boiler, while controlling the temperature difference of the waste heat boiler drum wall within the allowable operating range of the drum.

[0010] When the water supply side is unstable, the opening of the feedwater bypass regulating valve will be automatically reduced; when the water consumption side is unstable, the opening of the feedwater bypass regulating valve will be automatically reduced to control the temperature difference of the waste heat boiler drum wall within the allowable operating range of the drum; when the actual water flow exceeds the high limit, the water supply side parameter exceeds the low limit, or the water consumption side parameter exceeds the high limit, the feedwater bypass regulating valve will be automatically locked during the boiler water supply program.

[0011] The waste heat boiler drum automatic water supply control system includes a feedwater main control valve control circuit for controlling the opening of the feedwater main control valve and a feedwater bypass control valve control circuit for controlling the opening of the feedwater bypass control valve.

[0012] The feedwater main control valve control circuit includes a steam drum water level deviation block, a first feedwater main control valve setting module, a feedwater main control valve switching block, a second feedwater main control valve setting module, a feedwater main control valve control block, a boiler water supply program control block, a pulse block, and a feedwater main control valve operation block.

[0013] The output of the steam drum water level deviation block is connected to the input X1 of the feedwater main regulating valve control block. The output OUT of the feedwater main regulating valve control block is connected to the input A of the feedwater main regulating valve operation block. The output of the first feedwater main regulating valve setting module is connected to the input Y of the feedwater main regulating valve switching block. The output of the second feedwater main regulating valve setting module is connected to the input N of the feedwater main regulating valve switching block. The output of the boiler water supply program control block is connected to the input X1 of the feedwater main regulating valve switching block. The output OUT of the feedwater main regulating valve switching block is connected to the input X2 of the feedwater main regulating valve control block, serving as the upper limit of the PID output of the feedwater main regulating valve. The output of the boiler water supply program control block is connected to the input X1 of the pulse block. The output OUT of the pulse block is connected to the input T of the feedwater main regulating valve operation block.

[0014] The water supply bypass valve control circuit includes a water supply bypass valve control block, a water supply bypass valve operation block, a water supply bypass valve speed limiting block, an actual water flow module, a preset water supply flow module, a water supply side parameter module, a water consumption side parameter module, a preset water supply flow correction module, a water supply side correction module, a water consumption side correction module, a water supply side low limit block, an actual water flow high limit block, a water consumption side high limit block, an AND gate, an OR gate, and a multiplication block;

[0015] The output of the steam drum water level deviation block is connected to the input X1 of the feedwater bypass regulating valve control block; the output OUT of the feedwater bypass regulating valve control block is connected to the input X1 of the feedwater bypass regulating valve speed limiting block; the output OUT of the feedwater bypass regulating valve speed limiting block is connected to the input A of the feedwater bypass regulating valve operation block; the output of the boiler water supply program control block is connected to the input X2 of the gate block; the output OUT of the pulse block is connected to the input T of the feedwater bypass regulating valve operation block; the output of the preset water supply flow module is connected to the input X1 of the preset water supply flow correction module; the output OUT of the preset water supply flow correction module is connected to the input X1 of the multiplication block; the output of the water supply side parameter module is connected to the input X1 of the water supply side correction module; the output OUT of the water supply side correction module is connected to the input X2 of the multiplication block; and the output of the water supply side parameter module is connected to the input X2 of the water supply side correction module. The input terminal X1 of the block is connected to the multiplication block. The output terminal OUT of the water-side correction module is connected to the input terminal X3 of the multiplication block. The output terminal OUT of the multiplication block is connected to the input terminal X2 of the water supply bypass valve control block. The output terminal of the actual water flow module is connected to the input terminal X1 of the actual water flow high limit block. The output terminal OUT of the actual water flow high limit block is connected to the input terminal X1 of the OR gate block. The output terminal of the water supply side parameter module is connected to the input terminal X1 of the water supply side low limit block. The output terminal OUT of the water supply side low limit block is connected to the input terminal X2 of the OR gate block. The output terminal of the water-side parameter module is connected to the input terminal X1 of the water supply side high limit block. The output terminal OUT of the water supply side high limit block is connected to the input terminal X3 of the OR gate block. The output terminal OUT of the OR gate block is connected to the input terminal X1 of the AND gate block. The output terminal OUT of the AND gate block is connected to the input terminal X3 of the water supply bypass valve control block.

[0016] The pulse duration of the pulse block is 3 seconds.

[0017] The setting value of the first water supply main control valve setting module is 0%.

[0018] The setting value of the second water supply main control valve setting module is 100%.

[0019] When the input signal X1 of the main feedwater regulating valve switching block is true, the output signal Y of the main feedwater regulating valve switching block is 0%; when the input signal X1 of the main feedwater regulating valve switching block is false, the output signal N of the main feedwater regulating valve switching block is 100%.

[0020] The water supply side parameters output by the water supply side parameter module include the condenser water level and the pressure of the condensate pump outlet header.

[0021] The water parameters output by the water-side parameter module include the temperature difference value of the steam drum wall.

[0022] The present invention has the following beneficial effects:

[0023] In practical operation, the automatic water supply control method for waste heat boiler drum described in this invention automatically engages the main feedwater regulating valve and the feedwater bypass regulating valve to control the drum water level, eliminating the need for manual control by operators and reducing operational workload, thus achieving automatic control of waste heat boiler water supply. Furthermore, based on the operating conditions of the waste heat boiler, the opening degree of the feedwater bypass regulating valve is automatically controlled to match the optimal water supply volume, while simultaneously controlling the drum wall temperature difference within the drum's allowable operating range, thereby matching the boiler water supply rate with the current operating conditions. Additionally, when the water supply side is unstable, the opening degree of the feedwater bypass regulating valve is automatically reduced to minimize its impact; when the water consumption side is unstable, the opening degree of the feedwater bypass regulating valve is automatically reduced to control the drum wall temperature difference within the drum's allowable operating range; when the actual water flow exceeds the high limit, the water supply side parameters exceed the low limit, or the water consumption side parameters exceed the high limit, the feedwater bypass regulating valve is automatically locked during the boiler water supply process to improve system stability. Attached Figure Description

[0024] Figure 1 This is a diagram of the waste heat boiler water supply system of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention.

[0026] Among them, PID-01 is the feedwater main control valve control block, PID-02 is the feedwater bypass control valve control block, MA-01 is the feedwater main control valve operation block, MA-02 is the feedwater bypass control valve operation block, V-01 is the feedwater bypass control valve speed limiting block, T-01 is the feedwater main control valve switching block, E-01 is the steam drum water level deviation block, A-01 is the actual water flow module, A-02 is the first feedwater main control valve setting module, A-03 is the second feedwater main control valve setting module, and A-04 is the preset feedwater flow. The following modules are listed: A-05 (water supply side parameter module), A-06 (water user side parameter module), DI-01 (boiler water supply control block), F-01 (preset water supply flow correction module), F-02 (water supply side correction module), F-03 (water user side correction module), L-01 (water supply side low limit block), H-01 (actual water flow high limit block), H-02 (water user side high limit block), PLS-01 (pulse block), AND-01 (AND gate block), OR-01 (OR gate block), and MUL-01 (multiplication block). Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0028] The accompanying drawings show a schematic diagram of the structure according to an embodiment disclosed in the present invention.

[0029] The implementation of this invention may take different forms in different DCS, PLC, and other control systems due to variations in computer languages, but the implementation method and functions remain unchanged. Relevant parameter settings should be configured according to the actual operating parameters of the unit.

[0030] refer to Figure 1 The automatic water supply control method for waste heat boiler drum of the present invention includes the following steps:

[0031] Once the conditions for one-button water filling of the waste heat boiler are met, the waste heat boiler will automatically fill water in stages. After the water level in the low-pressure steam drum is normal, water will be simultaneously added to the medium-pressure steam drum and the high-pressure steam drum.

[0032] During the boiler water filling process, the main feedwater control valve and the feedwater bypass control valve are automatically put into the automatic position, the main feedwater control valve is automatically closed, and the opening of the feedwater bypass control valve is automatically controlled according to the operating conditions of the waste heat boiler to match the optimal water filling volume of the waste heat boiler, while controlling the temperature difference of the waste heat boiler drum wall within the allowable operating range of the drum.

[0033] When the water supply side is unstable, the opening of the feedwater bypass regulating valve is automatically reduced to minimize the impact on the water supply side. When the water consumption side is unstable, the opening of the feedwater bypass regulating valve is automatically reduced to control the temperature difference of the waste heat boiler drum wall within the allowable operating range of the drum. When the actual water flow exceeds the high limit, the water supply side parameter exceeds the low limit, or the water consumption side parameter exceeds the high limit, the feedwater bypass regulating valve is automatically locked during the boiler water supply process.

[0034] refer to Figure 2 The automatic water supply control method for the waste heat boiler drum is implemented by the automatic water supply control system for the waste heat boiler drum of the present invention, which includes a feedwater bypass regulating valve control circuit and a feedwater main regulating valve control circuit.

[0035] The feedwater main control valve control loop includes a steam drum water level deviation block E-01, a first feedwater main control valve setting module A-02, a feedwater main control valve switching block T-01, a second feedwater main control valve setting module A-03, a feedwater main control valve control block PID-01, a boiler water supply program control block DI-01, a pulse block PLS-01, and a feedwater main control valve operation block MA-01.

[0036] The output terminal of the steam drum water level deviation block E-01 is connected to the input terminal X1 of the feedwater main regulating valve control block PID-01; the output terminal OUT of the feedwater main regulating valve control block PID-01 is connected to the input terminal A of the feedwater main regulating valve operation block MA-01; the output terminal of the first feedwater main regulating valve setting module A-02 is connected to the input terminal Y of the feedwater main regulating valve switching block T-01; the output terminal of the second feedwater main regulating valve setting module A-03 is connected to the input terminal N of the feedwater main regulating valve switching block T-01; on the boiler... The output terminal of the water flow control block DI-01 is connected to the input terminal X1 of the feedwater main regulating valve switching block T-01; the output terminal OUT of the feedwater main regulating valve switching block T-01 is connected to the input terminal X2 of the feedwater main regulating valve control block PID-01, serving as the upper limit of the PID output of the feedwater main regulating valve; the output terminal of the boiler water supply control block DI-01 is connected to the input terminal X1 of the pulse block PLS-01; and the output terminal OUT of the pulse block PLS-01 is connected to the input terminal T of the feedwater main regulating valve operation block MA-01.

[0037] The water supply bypass control valve control loop includes a water supply bypass control valve control block PID-02, a water supply bypass control valve operation block MA-02, a water supply bypass control valve speed limiting block V-01, an actual water flow module A-01, a preset water flow module A-04, a water supply side parameter module A-05, a water consumption side parameter module A-06, a preset water flow correction module F-01, a water supply side correction module F-02, a water consumption side correction module F-03, a water supply side low limit block L-01, an actual water flow module A-01 high limit block, a water consumption side high limit block H-02, an AND gate block AND-01, an OR gate block OR-01, and a multiplication block MUL-01.

[0038] The output terminal of the steam drum water level deviation block E-01 is connected to the input terminal X1 of the feedwater bypass regulating valve control block PID-02. The output terminal OUT of the feedwater bypass regulating valve control block PID-02 is connected to the input terminal X1 of the feedwater bypass regulating valve speed limiter block V-01. The output terminal OUT of the feedwater bypass regulating valve speed limiter block V-01 is connected to the input terminal A of the feedwater bypass regulating valve operation block MA-02. The output terminal of the boiler water supply control block DI-01 is connected to the input terminal X2 of the AND gate block AND-01. The output terminal OUT of the pulse block PLS-01 is connected to the feedwater bypass regulating valve operation block MA-02. The input terminal T of module A-02 is connected to the output terminal of module F-04, which is connected to the input terminal X1 of module F-01. The output terminal OUT of module F-01 is connected to the input terminal X1 of multiplication block MUL-01. The output terminal of module A-05 is connected to the input terminal X1 of module F-02, which is connected to the input terminal X2 of multiplication block MUL-01. The output terminal of module A-06 is connected to the input terminal X2 of module F-03. The input terminal X1 of the water-side correction module F-03 is connected to the input terminal X3 of the multiplication block MUL-01. The output terminal OUT of the multiplication block MUL-01 is connected to the input terminal X2 of the water supply bypass control block PID-02. The output terminal of the actual water flow module A-01 is connected to the input terminal X1 of the actual water flow module A-01 high limit block. The output terminal OUT of the actual water flow high limit block H-01 is connected to the input terminal X1 of the OR gate block OR-01. The output terminal of the water supply side parameter module A-05 is connected to the water supply side low limit block L-01. The input terminal X1 of the water supply side low limit block L-01 is connected to the input terminal X2 of the OR gate block OR-01. The output terminal of the water supply side parameter module A-06 is connected to the input terminal X1 of the water supply side high limit block H-02. The output terminal OUT of the water supply side high limit block H-02 is connected to the input terminal X3 of the OR gate block OR-01. The output terminal OUT of the OR gate block OR-01 is connected to the input terminal X1 of the AND gate block AND-01. The output terminal OUT of the AND gate block AND-01 is connected to the input terminal X3 of the water supply bypass regulating valve control block PID-02.

[0039] Additionally, it should be noted that the pulse duration of the pulse block PLS-01 is 3 seconds; the setting value of the first water supply main control valve setting module A-02 is 0%; and the setting value of the second water supply main control valve setting module A-03 is 100%.

[0040] When the input signal X1 of the main feedwater regulating valve switching block T-01 is true, the output signal Y of the main feedwater regulating valve switching block T-01 is 0%; when the input signal X1 of the main feedwater regulating valve switching block T-01 is false, the output signal N of the main feedwater regulating valve switching block T-01 is 100%.

[0041] In addition, the preset water flow module A-04 determines the current optimal water flow based on the current operating conditions of the boiler, and converts it into the optimal water opening degree of the feedwater bypass regulating valve through the preset water flow correction module F-01.

[0042] The water supply side parameters output by the water supply side parameter module A-05 include the condenser water level and the condensate pump outlet header pressure. Taking the condensate pump outlet pressure as an example: the water supply side correction module F-02 corrects the pressure to 1 based on the optimal condensate pump outlet header pressure when the boiler is filled with water, and corrects it to 0.2 based on the standby pump start-up pressure. It automatically corrects the opening of the feedwater bypass regulating valve according to the condensate pump outlet header pressure to improve the stability of the water supply system. When the water supply side is unstable, it automatically reduces the opening of the feedwater bypass regulating valve to reduce the impact on the water supply side.

[0043] The water parameters output by the water-side parameter module A-06 include the steam drum wall temperature difference value. For example, the water-side correction module F-03 corrects the steam drum wall temperature difference value of 10℃ to 1 and 50℃ to 0.2. It automatically corrects the opening of the feedwater bypass regulating valve according to the boiler steam drum wall temperature difference value to improve the stability of the water system. When the steam drum wall temperature difference is large, it automatically reduces the opening of the feedwater bypass regulating valve to control the waste heat boiler steam drum wall temperature difference within the allowable operating range of the steam drum.

[0044] When the actual water flow module A-01 exceeds the optimal water supply correction value, the condensate outlet header pressure is lower than the standby pump start-up pressure correction value, the condenser water level is lower than the preset water level, or the steam drum wall temperature difference exceeds 40℃, the feedwater bypass regulating valve will be locked to improve the stability of the boiler water supply system.

[0045] During the boiler water filling process, the main feedwater control valve and the feedwater bypass control valve are automatically put into the automatic position. The main feedwater control valve is automatically kept in the closed position, and the feedwater bypass control valve is gradually opened after adjustment and speed limiting to reduce disturbance to the water supply side.

[0046] Finally, it should be noted that the parameters of the preset water flow correction module F-01, water supply side correction module F-02, water consumption side correction module F-03, water supply side low limit block L-01, actual water flow high limit block H-01, and water consumption side high limit block H-02 are set according to the size of the waste heat boiler drum, the change in drum wall temperature, the output of the pump, the flow rate of the valve, and the flow characteristics.

Claims

1. A method of automatically filling a steam drum of a waste heat boiler, characterized by, include: Once the conditions for one-button water filling of the waste heat boiler are met, the waste heat boiler will automatically fill water in stages. After the water level in the low-pressure steam drum is normal, water will be simultaneously added to the medium-pressure steam drum and the high-pressure steam drum. During the boiler water filling process, the main feedwater control valve and the feedwater bypass control valve are automatically put into the automatic position, the main feedwater control valve is automatically closed, and the opening of the feedwater bypass control valve is automatically controlled according to the operating conditions of the waste heat boiler to match the optimal water filling volume of the waste heat boiler, while controlling the temperature difference of the waste heat boiler drum wall within the allowable operating range of the drum. When the water supply is unstable, the opening of the feedwater bypass regulating valve is automatically reduced; when the water consumption is unstable, the opening of the feedwater bypass regulating valve is automatically reduced to control the temperature difference of the waste heat boiler drum wall within the allowable operating range of the drum; when the actual water flow exceeds the high limit, the water supply parameters exceed the low limit, or the water consumption parameters exceed the high limit, the feedwater bypass regulating valve is automatically locked during the boiler water filling process. This method is implemented through an automatic water supply control system for the waste heat boiler drum. The automatic water supply control system for the waste heat boiler drum includes a feedwater main control valve control circuit for controlling the opening of the feedwater main control valve and a feedwater bypass control valve control circuit for controlling the opening of the feedwater bypass control valve. The feedwater main control valve control loop includes a steam drum water level deviation block (E-01), a first feedwater main control valve setting module (A-02), a feedwater main control valve switching block (T-01), a second feedwater main control valve setting module (A-03), a feedwater main control valve control block (PID-01), a boiler water supply program control block (DI-01), a pulse block (PLS-01), and a feedwater main control valve operation block (MA-01). The output of the steam drum water level deviation block (E-01) is connected to the input X1 of the feedwater main regulating valve control block (PID-01); the output OUT of the feedwater main regulating valve control block (PID-01) is connected to the input A of the feedwater main regulating valve operation block (MA-01); the output of the first feedwater main regulating valve setting module (A-02) is connected to the input Y of the feedwater main regulating valve switching block (T-01); the output of the second feedwater main regulating valve setting module (A-03) is connected to the input N of the feedwater main regulating valve switching block (T-01); on the boiler... The output terminal of the water flow control block (DI-01) is connected to the input terminal X1 of the feedwater main control valve switching block (T-01); the output terminal OUT of the feedwater main control valve switching block (T-01) is connected to the input terminal X2 of the feedwater main control valve control block (PID-01), serving as the upper limit of the PID output of the feedwater main control valve; the output terminal of the boiler water supply control block (DI-01) is connected to the input terminal X1 of the pulse block (PLS-01); the output terminal OUT of the pulse block (PLS-01) is connected to the input terminal T of the feedwater main control valve operation block (MA-01). The water supply bypass valve control loop includes a water supply bypass valve control block (PID-02), a water supply bypass valve operation block (MA-02), a water supply bypass valve speed limit block (V-01), an actual water flow module (A-01), a preset water supply flow module (A-04), a water supply side parameter module (A-05), a water consumption side parameter module (A-06), a preset water supply flow correction module (F-01), a water supply side correction module (F-02), a water consumption side correction module (F-03), a water supply side low limit block (L-01), an actual water flow high limit block (H-01), a water consumption side high limit block (H-02), an AND gate block (AND-01), an OR gate block (OR-01), and a multiplication block (MUL-01). The output terminal of the steam drum water level deviation block (E-01) is connected to the input terminal X1 of the feedwater bypass regulating valve control block (PID-02). The output terminal OUT of the feedwater bypass regulating valve control block (PID-02) is connected to the input terminal X1 of the feedwater bypass regulating valve speed limiter block (V-01). The output terminal OUT of the feedwater bypass regulating valve speed limiter block (V-01) is connected to the input terminal A of the feedwater bypass regulating valve operation block (MA-02). The output terminal of the boiler water supply control block (DI-01) is connected to the input terminal X2 of the AND gate block (AND-01). The output terminal OUT of the pulse block (PLS-01) is connected to the input terminal A of the feedwater bypass regulating valve operation block (MA-02). The input terminal T of the water supply side parameter module (A-02) is connected to the input terminal X1 of the preset water supply flow correction module (F-01). The output terminal OUT of the preset water supply flow correction module (F-01) is connected to the input terminal X1 of the multiplication block (MUL-01). The output terminal of the water supply side parameter module (A-05) is connected to the input terminal X1 of the water supply side correction module (F-02). The output terminal OUT of the water supply side correction module (F-02) is connected to the input terminal X2 of the multiplication block (MUL-01). The output terminal of the water supply side parameter module (A-06) is connected to the input terminal X2 of the water supply side correction module (F-03). The input terminal X1 of the water-side correction module (F-03) is connected to the input terminal X3 of the multiplication block (MUL-01). The output terminal OUT of the multiplication block (MUL-01) is connected to the input terminal X2 of the water supply bypass control valve block (PID-02). The output terminal of the actual water flow module (A-01) is connected to the input terminal X1 of the high limit block of the actual water flow module (A-01). The output terminal OUT of the high limit block of the actual water flow (H-01) is connected to the input terminal X1 of the OR gate block (OR-01). The output terminal of the water supply side parameter module (A-05) is connected to the low limit block of the water supply side (L-01). The input terminal X1 of the water supply side low limit block (L-01) is connected to the input terminal X2 of the OR gate block (OR-01). The output terminal of the water supply side parameter module (A-06) is connected to the input terminal X1 of the water supply side high limit block (H-02). The output terminal OUT of the water supply side high limit block (H-02) is connected to the input terminal X3 of the OR gate block (OR-01). The output terminal OUT of the OR gate block (OR-01) is connected to the input terminal X1 of the AND gate block (AND-01). The output terminal OUT of the AND gate block (AND-01) is connected to the input terminal X3 of the water supply bypass valve control block (PID-02). The pulse duration of the pulse block (PLS-01) is 3 seconds; The setting value of the first water supply main control valve setting module (A-02) is 0%; The setting value of the second water supply main control valve setting module (A-03) is 100%; When the input signal X1 of the main feedwater regulating valve switching block (T-01) is true, the output signal Y of the main feedwater regulating valve switching block (T-01) is 0%; when the input signal X1 of the main feedwater regulating valve switching block (T-01) is false, the output signal N of the main feedwater regulating valve switching block (T-01) is 100%. The water supply side parameters output by the water supply side parameter module (A-05) include the condenser water level and the pressure of the condensate pump outlet header. The water parameters output by the water-side parameter module (A-06) include the temperature difference value of the steam drum wall.

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