A concentrated boron loop control method for an M310 nuclear power plant

Abstract

The present invention provides a concentrated boron circuit control method for an M310 nuclear power plant. A nuclear power plant concentrated boron circuit control device is disposed on the concentrated boron circuit. The device receives temperature signals of the boric acid solution from first and second thermometers. The device then controls the start and stop states of first and second boric acid circulating pumps based on the temperature signals and time, enabling alternating intermittent operation of the two pumps, intermittent operation of a single pump, or continuous operation of a single pump. The present invention is applicable to a variety of operating conditions, reduces energy consumption, and mitigates industrial safety risks.

Description

Technical Field

[0001] The present invention relates to the technical field of concentrated boron circuit operation of an M310 nuclear power plant, and in particular to a concentrated boron circuit control method for an M310 nuclear power plant. Background Art

[0002] Figure 1 The figure shows the concentrated boron loop of the nuclear power plant safety injection system. The concentrated boron loop is filled with a concentrated boric acid solution with a boron concentration of 17,000 to 19,000 ppm. The system is equipped with a circulation loop consisting of a boric acid circulation pump (a first boric acid circulation pump 2, a second boric acid circulation pump 3), a boric acid surge tank 1 and a boric acid injection tank 9. The entire loop is wrapped with an insulation layer, and a boric acid circulation pump maintains continuous operation to ensure the circulation state of the concentrated boric acid solution.

[0003] Under normal operating conditions, the first pneumatic valve 4 and the second pneumatic valve 5 remain open, the third pneumatic valve 6 and the fourth pneumatic valve 7 remain closed, and one of the two boric acid circulation pumps remains in operation to maintain the circulation of the concentrated boron circuit and ensure uniform temperature and boron concentration in the circuit.

[0004] Under accident conditions, after the injection signal is triggered, the first pneumatic valve 4 and the second pneumatic valve 5 are automatically closed, and the third pneumatic valve 6 and the fourth pneumatic valve 7 are automatically opened. The high-pressure injection pump provides power to inject the concentrated boron solution in the boric acid injection tank 9 into the reactor.

[0005] In order to avoid boron crystallization in concentrated boric acid solution, the temperature of the boric acid solution must be kept above the crystallization temperature of 50°C. In order to prevent crystallization, the temperature of the boric acid solution must be maintained above 68°C, but not above 80°C. Otherwise, there will be an industrial safety risk of burns due to excessive temperature. However, due to the continuous operation and circulation of the boric acid circulation pump, the temperature of the boric acid solution is maintained at around 90°C for a long time.

[0006] At present, a boric acid circulation pump in the concentrated boric acid circuit maintains continuous operation to ensure the circulation state of the concentrated boric acid solution. This has the following disadvantages: first, the temperature of the boric acid solution is maintained at around 90°C for a long time, posing an industrial safety risk of scalding people; second, a boric acid circulation pump is continuously running, resulting in a waste of electricity. Summary of the Invention

[0007] The purpose of the present invention is to provide a concentrated boron circuit control method for an M310 nuclear power plant, so as to solve the problem that the temperature of the boric acid solution is high for a long time and the boric acid circulation pump of the concentrated boron circuit has high energy consumption during continuous operation.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A concentrated boron circuit control method for an M310 nuclear power plant is disclosed. A concentrated boron circuit control device is arranged on the concentrated boron circuit. The device receives temperature signals of a boric acid solution from a first thermometer and a second thermometer. The device controls the start or stop state of a first boric acid circulation pump and a second boric acid circulation pump according to the temperature signals and time, thereby performing alternating intermittent operation of the two pumps, intermittent operation of a single pump, or continuous operation of a single pump.

[0010] As an implementable method, the control steps for the alternating intermittent operation of the dual pumps include:

[0011] Step 1.1: After the first boric acid circulation pump is started, the concentrated boron loop control device of the nuclear power plant controls the first boric acid circulation pump to automatically stop when all the following conditions are met at the same time. The conditions are as follows:

[0012] Condition A: The first boric acid circulation pump runs for a time of t1;

[0013] Condition B: The measured value of the first thermometer reaches T2;

[0014] Condition C: The measured value of the second thermometer reaches T2;

[0015] Step 1.2: After the first boric acid circulation pump is shut down, the second boric acid circulation pump is automatically started by the concentrated boron circuit control device of the nuclear power plant when any of the following conditions are met:

[0016] Condition D: The first boric acid circulation pump is shut down for a period of time equal to t2;

[0017] Condition E: The measured value of the first thermometer is lower than T1;

[0018] Condition F: The measurement value of the second thermometer is lower than T1;

[0019] Step 1.3: After the second boric acid circulation pump is started, the concentrated boron loop control device of the nuclear power plant controls the second boric acid circulation pump to automatically stop when all the following conditions are met:

[0020] Condition G: The second boric acid circulation pump runs for a time of t1;

[0021] Condition H: The measured value of the first thermometer reaches T2;

[0022] Condition I: The measured value of the second thermometer reaches T2;

[0023] Step 1.4: After the second boric acid circulating pump is shut down, the concentrated boron loop control device of the nuclear power plant controls the first boric acid circulating pump to automatically start when any of the following conditions are met:

[0024] Condition J: The second boric acid circulation pump is shut down for a period of time equal to t2;

[0025] Condition K: The measured value of the first thermometer is lower than T1;

[0026] Condition L: The measured value of the second thermometer is lower than T1;

[0027] Among them, t1 is the operating time of the boric acid circulation pump, t2 is the shutdown time of the boric acid circulation pump, T1 is the low temperature set value, and T2 is the high temperature set value.

[0028] As an practicable method, t1 is 60 minutes, t2 is 60 minutes, the low temperature set value T1 is 68°C, and the high temperature set value T2 is 73°C.

[0029] As an implementable approach, the control steps for the single pump alternating intermittent operation mode include:

[0030] Step 2.1: After the first boric acid circulation pump is started, it will automatically stop when all the following conditions are met:

[0031] Condition M: The first boric acid circulation pump runs for a time of t1;

[0032] Condition N: The measured value of the first thermometer reaches T2;

[0033] Condition O: The measured value of the second thermometer reaches T2;

[0034] Step 2.2: After the first boric acid circulation pump stops operating, it will automatically start when any of the following conditions are met:

[0035] Condition P: The first boric acid circulation pump is stopped for a period of time equal to t2;

[0036] Condition Q: The measurement value of the first thermometer is lower than T1;

[0037] Condition R: The measurement value of the second thermometer is lower than T1;

[0038] Among them, t1 is the operating time of the boric acid circulation pump, t2 is the shutdown time of the boric acid circulation pump, T1 is the low temperature set value, and T2 is the high temperature set value.

[0039] As an implementable manner, t1 is 30 to 720 minutes, t2 is 30 to 720 minutes, the low temperature set value T1 is 50 to 80°C, and the high temperature set value T2 is 60 to 90°C.

[0040] As an practicable method, t1 is 60 minutes, t2 is 60 minutes, the low temperature set value T1 is 68°C, and the high temperature set value T2 is 73°C.

[0041] As an implementable approach, the control steps for the single pump alternating intermittent operation mode include:

[0042] Step 3.1: After the second boric acid cycle is started, it will automatically stop when all the following conditions are met:

[0043] Condition S: The second boric acid circulation pump runs for a time of t1;

[0044] Condition T: The measured value of the first thermometer reaches T2;

[0045] Condition U: The measured value of the second thermometer reaches T2;

[0046] Step 3.2: After the second boric acid circulation pump stops operating, it will automatically start when any of the following conditions are met:

[0047] Condition V: The second boric acid circulation pump is shut down for a period of time equal to t2;

[0048] Condition W: The measurement value of the first thermometer is lower than T1;

[0049] Condition X: The measurement value of the second thermometer is lower than T1;

[0050] Among them, t1 is the operating time of the boric acid circulation pump, t2 is the shutdown time of the boric acid circulation pump, T1 is the low temperature set value, and T2 is the high temperature set value.

[0051] As an implementable manner, t1 is 30 to 720 minutes, t2 is 30 to 720 minutes, the low temperature set value T1 is 50 to 80°C, and the high temperature set value T2 is 60 to 90°C.

[0052] As an practicable method, t1 is 60 minutes, t2 is 60 minutes, the low temperature set value T1 is 68°C, and the high temperature set value T2 is 73°C.

[0053] As an implementable manner, the control steps of the single pump continuous operation mode include: the nuclear power plant concentrated boron loop control device controls any one of the first boric acid circulation pump and the second boric acid circulation pump to operate continuously.

[0054] Compared with the prior art, the concentrated boron loop control method for an M310 nuclear power plant provided by the present invention has the following beneficial effects:

[0055] The present invention is applicable to a variety of different operating conditions, can reduce energy consumption, and reduces industrial safety risks.

[0056] According to calculations, in dual-pump alternating intermittent operation mode or single-pump intermittent operation mode, the temperature of the concentrated boron circuit will stabilize between 71.85°C and 73°C. That is, after the boric acid circulating pump is shut down for 60 minutes, the temperature of the boric acid solution drops to 71.58°C. Then, after the boric acid circulating pump is restarted, the temperature of the boric acid solution reaches 73°C after 2.15 hours of operation. The present invention can significantly lower the temperature of the boric acid solution, reducing the industrial safety risk of burns. It can also maintain the boric acid solution at above 71.85°C, which is higher than the crystallization temperature of the boric acid solution, to prevent boric acid crystallization. It can also significantly shorten the operating time of the boric acid pump, effectively reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the technical description.

[0058] Figure 1 This is a schematic diagram of a concentrated boron circuit in the prior art;

[0059] Figure 2 Schematic diagram of the concentrated boron circuit provided by the present invention;

[0060] Figure 3 This is a logic diagram of the dual pump alternating intermittent operation mode provided by the present invention;

[0061] Figure 4 This is a logic diagram of the single pump intermittent operation mode of the first boric acid circulation pump provided by the present invention;

[0062] Figure 5 This is a logical diagram of the single pump intermittent operation mode of the second boric acid circulation pump provided by the present invention.

[0063] Description of reference numerals:

[0064] 1. Boric acid surge tank; 2. First boric acid circulation pump; 3. Second boric acid circulation pump; 4. First pneumatic valve; 5. Second pneumatic valve; 6. Third pneumatic valve; 7. Fourth pneumatic valve; 8. First thermometer; 9. Boric acid injection tank; 10. Second thermometer. DETAILED DESCRIPTION

[0065] The following is further explained in detail through specific implementation methods.

[0066] like Figures 2 to 5 As shown, the present invention provides a concentrated boron circuit control method for an M310 nuclear power plant. This control method is a new concentrated boron circuit operation mode for a nuclear power plant, which can be applied to a variety of different operating conditions, can reduce energy consumption, and reduce industrial safety risks.

[0067] The present invention adds a nuclear power plant concentrated boron circuit control device (control device 11) to the existing concentrated boron circuit. This device receives temperature signals of the boric acid solution from a first thermometer 8 and a second thermometer 10. Based on the temperature signals and time, control device 11 controls the start / stop status of two boric acid circulation pumps (first boric acid circulation pump 2 and second boric acid circulation pump 3). Three operating modes are available: alternating intermittent operation of two pumps, intermittent operation of a single pump, and continuous operation of a single pump.

[0068] The present invention is based on Figure 2 The following parameters are set for the loop to control the start / stop time and temperature interval of the two boric acid circulation pumps:

[0069] (1) Set the boric acid circulation pump operation time t1: the time is 60 minutes, which can be adjusted between 30 minutes and 720 minutes according to actual conditions.

[0070] (2) Set the boric acid circulation pump shutdown time t2: the time is 60 minutes, which can be adjusted between 30 minutes and 720 minutes according to actual conditions.

[0071] (3) Set the low temperature set value T1: The low temperature set value is 68℃, which can be adjusted between 50℃ and 80℃ according to actual conditions.

[0072] (4) Set the high temperature set value T2: The high temperature set value is 73℃, which can be adjusted between 60℃ and 90℃ according to actual conditions.

[0073] Mode 1 of the present invention: Dual pumps alternate intermittent operation mode, used under normal circumstances, the logic diagram is shown in Figure 3 The control steps of the dual pump alternating intermittent operation mode include:

[0074] Step 1.1: After the first boric acid circulation pump 2 is started, the control device 11 controls the first boric acid circulation pump 2 to automatically stop when all the following conditions are met at the same time. The conditions are as follows:

[0075] Condition A: The first boric acid circulation pump 2 runs for a time of t1 (60 min);

[0076] Condition B: The measured value of the first thermometer 8 reaches the fixed value T2;

[0077] Condition C: The measured value of the second thermometer 10 reaches the constant value T2;

[0078] Step 1.2: After the first boric acid circulating pump 2 stops operating, the control device 11 controls the second boric acid circulating pump 3 to automatically start when any of the following conditions are met:

[0079] Condition D: The first boric acid circulation pump 2 is stopped for a period of time equal to t2 (60 min).

[0080] Condition E: The measured value of the first thermometer 8 is lower than the set value T1;

[0081] Condition F: The measured value of the second thermometer 10 is lower than the set value T1;

[0082] Step 1.3: After the second boric acid circulation pump 3 is started, the control device 11 controls the second boric acid circulation pump 3 to automatically stop when all the following conditions are met at the same time. The conditions are as follows:

[0083] Condition G: The running time of the second boric acid circulation pump 3 reaches time t1 (60 min);

[0084] Condition H: The measured value of the first thermometer 8 reaches the fixed value T2;

[0085] Condition I: The measured value of the second thermometer 10 reaches the fixed value T2;

[0086] Step 1.4: After the second boric acid circulating pump 3 stops operating, the control device 11 controls the first boric acid circulating pump 2 to automatically start when any of the following conditions are met:

[0087] Condition J: The second boric acid circulation pump 3 is shut down for a period of time equal to t2 (60 min).

[0088] Condition K: The measured value of the first thermometer 8 is lower than the set value T1;

[0089] Condition L: The measurement value of the second thermometer 10 is lower than the T1 set value.

[0090] Mode 2 of the present invention: Single pump alternating intermittent operation mode, used when a certain boric acid circulation pump fails, the logic diagram is shown in Figure 4 and Figure 5 , the control steps of single pump alternating intermittent operation mode include:

[0091] (1) Control of the first boric acid circulation pump 2 includes:

[0092] Step 2.1: After the first boric acid circulation pump 2 is started, it will automatically stop when all the following conditions are met:

[0093] Condition M: the operation time of the first boric acid circulation pump 2 reaches time t1 (60 min);

[0094] Condition N: the measured value of the first thermometer 8 reaches the fixed value T2;

[0095] Condition O: The measured value of the second thermometer 10 reaches the fixed value T2;

[0096] Step 2.2: After the first boric acid circulation pump 2 stops operating, it will automatically start when any of the following conditions are met:

[0097] Condition P: The first boric acid circulation pump 2 is stopped for a period of time equal to t2 (60 min).

[0098] Condition Q: The measured value of the first thermometer 8 is lower than the set value T1;

[0099] Condition R: The measured value of the second thermometer 10 is lower than the set value T1;

[0100] (2) Control of the second boric acid circulation pump 3 includes:

[0101] Step 3.1: After the second boric acid circulation pump 3 is started, it will automatically stop when all the following conditions are met:

[0102] Condition S: The second boric acid circulation pump 3 runs for a time of t1 (60 min);

[0103] Condition T: The measured value of the first thermometer 8 reaches the fixed value T2;

[0104] Condition U: The measured value of the second thermometer 10 reaches the constant value T2;

[0105] Step 3.2: After the second boric acid circulation pump 3 stops operating, it will automatically start when any of the following conditions are met:

[0106] Condition V: The second boric acid circulation pump 3 is stopped for a period of time equal to t2 (60 min).

[0107] Condition W: The measured value of the first thermometer 8 is lower than the set value T1;

[0108] Condition X: The measured value of the second thermometer 10 is lower than the T1 set value.

[0109] Mode 3 of the present invention: single pump continuous operation mode, which is used in the boric acid solution preparation process, because the boric acid solution preparation process requires a boric acid circulation pump to operate continuously.

[0110] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A concentrated boron loop control method for an M310 nuclear power plant, characterized in that: A nuclear power plant concentrated boron circuit control device is arranged on the concentrated boron circuit, a first thermometer is connected to a boric acid surge tank, a second thermometer is connected to a boric acid injection tank, a second boric acid circulation pump is arranged on a connecting pipeline between the boric acid surge tank and the boric acid injection tank, the first boric acid circulation pump and the second boric acid circulation pump are arranged in parallel, and a temperature signal of the boric acid solution is received from the first thermometer and the second thermometer. The nuclear power plant concentrated boron circuit control device controls the start or stop state of the first boric acid circulation pump and the second boric acid circulation pump according to the temperature signal and time, and performs alternating intermittent operation of the two pumps, intermittent operation of a single pump, or continuous operation of a single pump; The control steps for alternating intermittent operation of dual pumps include: Step 1.1: After the first boric acid circulation pump is started, the concentrated boron loop control device of the nuclear power plant controls the first boric acid circulation pump to automatically stop when all the following conditions are met at the same time. The conditions are as follows: Condition A: The first boric acid circulation pump runs for a time of t1; Condition B: The measured value of the first thermometer reaches T2; Condition C: The measured value of the second thermometer reaches T2; Step 1.2: After the first boric acid circulation pump is shut down, the second boric acid circulation pump is automatically started by the concentrated boron circuit control device of the nuclear power plant when any of the following conditions are met: Condition D: The first boric acid circulation pump is shut down for a period of time equal to t2; Condition E: The measured value of the first thermometer is lower than T1; Condition F: The measurement value of the second thermometer is lower than T1; Step 1.3: After the second boric acid circulation pump is started, the concentrated boron loop control device of the nuclear power plant controls the second boric acid circulation pump to automatically stop when all the following conditions are met: Condition G: The second boric acid circulation pump runs for a time of t1; Condition H: The measured value of the first thermometer reaches T2; Condition I: The measured value of the second thermometer reaches T2; Step 1.4: After the second boric acid circulating pump is shut down, the concentrated boron loop control device of the nuclear power plant controls the first boric acid circulating pump to automatically start when any of the following conditions are met: Condition J: The second boric acid circulation pump is shut down for a period of time equal to t2; Condition K: The measured value of the first thermometer is lower than T1; Condition L: The measured value of the second thermometer is lower than T1; Among them, t1 is the running time of the boric acid circulation pump, t2 is the stopping time of the boric acid circulation pump, T1 is the low temperature set value, and T2 is the high temperature set value; The control steps for single pump alternating intermittent operation mode include: Step 2.1: After the first boric acid circulation pump is started, it will automatically stop when all the following conditions are met: Condition M: The operation time of the first boric acid circulation pump reaches t1'; Condition N: The measured value of the first thermometer reaches T2'; Condition O: The measured value of the second thermometer reaches T2'; Step 2.2: After the first boric acid circulation pump stops operating, it will automatically start when any of the following conditions are met: Condition P: The first boric acid circulation pump is stopped for a period of time equal to t2'; Condition Q: The measured value of the first thermometer is lower than T1'; Condition R: The measurement value of the second thermometer is lower than T1'; Among them, t1' is the running time of the boric acid circulation pump, t2' is the stopping time of the boric acid circulation pump, T1' is the low temperature set value, and T2' is the high temperature set value.

2. The concentrated boron loop control method for an M310 nuclear power plant according to claim 1, characterized in that: t1 is 60min, t2 is 60min, low temperature set value T1 is 68℃, and high temperature set value T2 is 73℃.

3. The concentrated boron loop control method of the M310 nuclear power plant according to claim 1, characterized in that: t1' is 30~720min, t2' is 30~720min, low temperature set value T1' is 50~80℃, and high temperature set value T2' is 60~90℃.

4. The concentrated boron loop control method for an M310 nuclear power plant according to claim 3, characterized in that: t1' is 60min, t2' is 60min, the low temperature set value T1' is 68℃, and the high temperature set value T2' is 73℃.

5. The concentrated boron loop control method for an M310 nuclear power plant according to claim 1, characterized in that: The control steps for single pump alternating intermittent operation mode include: Step 3.1: After the second boric acid cycle is started, it will automatically stop when all the following conditions are met: Condition S: The second boric acid circulation pump runs for a time of t1”; Condition T: The measured value of the first thermometer reaches T2"; Condition U: The measured value of the second thermometer reaches T2"; Step 3.2: After the second boric acid circulation pump stops operating, it will automatically start when any of the following conditions are met: Condition V: The second boric acid circulation pump is shut down for a period of time equal to t2”; Condition W: The measured value of the first thermometer is lower than T1"; Condition X: The measurement value of the second thermometer is lower than T1"; Among them, t1” is the operating time of the boric acid circulation pump, t2” is the shutdown time of the boric acid circulation pump, T1” is the low temperature set value, and T2” is the high temperature set value.

6. The concentrated boron loop control method for an M310 nuclear power plant according to claim 5, characterized in that: t1” is 30~720min, t2” is 30~720min, low temperature set value T1” is 50~80℃, high temperature set value T2” is 60~90℃.

7. The concentrated boron loop control method for an M310 nuclear power plant according to claim 6, characterized in that: t1” is 60min, t2” is 60min, low temperature set value T1” is 68℃, and high temperature set value T2” is 73℃.

8. The concentrated boron loop control method for an M310 nuclear power plant according to claim 1, characterized in that: The control steps of the single pump continuous operation mode include: the nuclear power plant concentrated boron loop control device controls any one of the first boric acid circulation pump and the second boric acid circulation pump to operate continuously.

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