Steam source control method and device under dual-module high-temperature gas-cooled reactor steam pressure composite control mode

Abstract

The application provides a steam source control method and device under a dual-module high-temperature gas cooled reactor steam pressure composite control mode, and belongs to the technical field of high-temperature gas cooled reactors. The control method comprises the following steps: when the power of at least one reactor of two reactors reaches a power preset value, a signal of the reactor steam entering a steam turbine is triggered, a first flow instruction is obtained according to the steam inlet results of the two reactors, and the first flow instruction is fed back to a pressure controller; when the two reactors are operated with steam turbines and steam source switching is required, the steam of one of the reactors is turned off, a second flow instruction is obtained according to the steam results of the two reactors, and the second flow instruction is fed back to the pressure controller; and the pressure controller obtains a total valve position reference value of a regulating valve according to a pressure deviation and the first flow instruction or the second flow instruction, so that when the steam of any one of the two reactors enters or exits the steam turbine, the steam pressure is stably operated at a constant pressure, and the stable operation of the other reactor with the steam turbine is not affected.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature gas-cooled reactor technology, specifically relating to a steam source control method and device under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode. Background Technology

[0002] The high-temperature gas-cooled reactor unit is configured as a dual-reactor-one-generator unit, meaning two reactors drive one turbine generator. The operating mode is reactor-following-reactor mode, where the reactors receive load commands from the grid dispatch center and control the unit's load. After the turbine is started up and connected to the grid with initial load, it enters a constant steam pressure automatic control mode—a feedforward / feedback composite control system. During normal operating conditions with power output, the digital electro-hydraulic control system (Digital...)

[0003] Electro-Hydraulic (DEH) reactors adjust the main steam pressure by setting the control valves to the appropriate opening degree based on the reactor's target load through feedforward control. At the same time, the pressure controller provides feedback control of the steam pressure to achieve constant and stable operation of the steam pressure.

[0004] Because there are many possible operating conditions involving two reactors operating with one turbine, and normal steam inlet to the turbine includes single-reactor steam inlet, dual-reactor steam inlet, and steam source switching, and steam inlet and switching can occur under both low and high pressure, unstable steam source control can lead to turbine shutdown. Current control methods cannot meet the requirements for all of these operating conditions, especially for complex conditions such as steam source switching or emergency reactor shutdown. Current control methods are inadequate for single-reactor steam inlet, dual-reactor steam inlet, and...

[0005] During the steam source switching process, the control valve cannot accurately feed back commands to the pressure control system, and therefore cannot accurately respond to changes in the steam source. As a result, large movements of the control valve cause fluctuations in the main steam pressure, affecting the operation of the steam turbine. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a steam source control method and device under the combined control mode of steam pressure in a dual-module high-temperature gas-cooled reactor.

[0007] In one aspect, the present invention provides a steam source control method under a combined steam pressure control mode for a dual-module high-temperature gas-cooled reactor, the control method comprising:

[0008] When the power of at least one of the two reactors reaches the preset power value, a signal is triggered to allow steam from at least one reactor to enter the turbine. A first flow command is obtained based on the steam intake results of the two reactors and the first flow command is fed back to the pressure controller.

[0009] When two reactors are operating with steam turbines and steam source switching is required, one of the reactors is desteamed. The second flow command is obtained based on the steam results of the two reactors and fed back to the pressure controller.

[0010] The pressure controller obtains the total valve position reference value of the regulating valve based on the pressure deviation and the first flow command or the second flow command.

[0011] Optionally, obtaining the first flow command based on the steam inlet results of the two reactors includes:

[0012] When steam from both reactors enters the turbine, the target load and the first upward speed of each reactor are multiplied to obtain two first steam inlet flow rates.

[0013] The first flow rate command is obtained by superimposing the two first steam inlet flow rates.

[0014] Optionally, obtaining the first flow command based on the steam inlet results of the two reactors includes:

[0015] When steam from one reactor enters the turbine while steam from the other reactor does not enter the turbine, the target load of one reactor is multiplied by the first upward rate to obtain the first steam inlet flow rate.

[0016] Multiply the target load of the other reactor by the second upflow rate to obtain the second steam inlet flow rate;

[0017] The first steam inlet flow rate and the second steam inlet flow rate are superimposed to obtain the first flow rate command.

[0018] Optionally, the first uplink rate is (0.01~0.1)% / cycle, and the second uplink rate is 0.

[0019] Optionally, when two reactors are operating with steam turbines and a steam source switch is required, performing a steam removal operation on one of the reactors and obtaining a second flow command based on the steam results of the two reactors includes:

[0020] When two reactors are operating with steam turbines and steam source switching is required, one of the reactors performs a steam removal operation. The target load of this reactor is multiplied by the first downward rate to obtain the first steam removal flow rate.

[0021] Another reactor operates with a steam turbine. The target load of this other reactor is multiplied by the first upward speed to obtain the first steam inlet flow rate.

[0022] The first exhaust steam flow rate and the first intake steam flow rate are superimposed to obtain the second flow rate command.

[0023] Optionally, the first uplink rate is (0.01~0.1)% / cycle, and the first downlink rate is (0.01~0.1)% / cycle.

[0024] Optionally, the control method further includes:

[0025] When two reactors are operating with steam turbines and one reactor is reducing its power output, a third flow command is obtained based on the steam output of the two reactors and the third flow command is fed back to the pressure controller.

[0026] The pressure controller obtains the total valve position reference value of the regulating valve based on the pressure deviation and the third flow command.

[0027] Optionally, obtaining the third flow command when both reactors are operating with turbines and one reactor is reducing power includes:

[0028] When two reactors are operating with steam turbines and one of the reactors is reducing its power, the target load of that reactor and the second downward rate are multiplied to obtain the second exhaust steam flow rate.

[0029] Another reactor is running with a steam turbine. The target load of this other reactor is multiplied by the first upward rate to obtain the first steam inlet flow rate.

[0030] The second exhaust steam flow rate and the first intake steam flow rate are superimposed to obtain the third flow rate command.

[0031] Optionally, the first uplink rate is (0.01~0.1)% / cycle, and the second downlink rate is (1~10)% / cycle.

[0032] In another aspect, the present invention provides a steam source control device under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode, comprising:

[0033] The first acquisition module is used to trigger a signal for steam from at least one of the two reactors to enter the turbine when the power of at least one reactor reaches a preset power value, acquire a first flow command based on the steam intake results of the two reactors, and feed the first flow command back to the pressure controller.

[0034] The second acquisition module is used to perform a steam removal operation on one of the reactors when the two reactors are running with steam turbines and steam source switching is required. It acquires a second flow command based on the steam results of the two reactors and feeds the second flow command back to the pressure controller.

[0035] A pressure controller is used to obtain a total valve position reference value for the control valve based on the pressure deviation and the first flow command or the second flow command.

[0036] This invention proposes a steam source control method and apparatus under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode. The control method includes: when the power of at least one of the two reactors reaches a preset power value, triggering a signal for steam from that reactor to enter the turbine; obtaining a first flow command based on the steam inlet results of the two reactors; and feeding the first flow command back to the pressure controller; when both reactors are operating with the turbine and steam source switching is required, performing a steam removal operation on one of the reactors; obtaining a second flow command based on the steam inlet results of the two reactors; and feeding the second flow command back to the pressure controller; the pressure controller obtains the total valve position reference value of the regulating valve based on the pressure deviation and the first or second flow command, so as to ensure that the steam pressure is stable when steam from either reactor enters or exits the turbine, without affecting the stable operation of the other reactor with the turbine. Attached Figure Description

[0037] Figure 1 This is a flowchart of a steam source control method under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode according to an embodiment of the present invention.

[0038] Figure 2 This is a flowchart of a steam source control method under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode, according to another embodiment of the present invention.

[0039] Figure 3 The following is a logic control diagram of the steam source control method under the combined control mode of steam pressure in a dual-module high-temperature gas-cooled reactor according to another embodiment of the present invention.

[0040] Figure 4 This is a schematic diagram of the steam source control device under the combined control mode of steam pressure in a dual-module high-temperature gas-cooled reactor according to another embodiment of the present invention. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0042] like Figure 1 As shown, one aspect of the present invention provides a steam source control method S100 under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode, specifically including the following steps S110 to S130:

[0043] S110. When the power of at least one of the two reactors reaches the preset power value, a signal is triggered to allow steam from at least one reactor to enter the turbine. A first flow command is obtained based on the steam intake results of the two reactors, and the first flow command is fed back to the pressure controller.

[0044] Specifically, at least one reactor is started. When the power of at least one reactor reaches a preset power value (the preset power value is 30% of the rated power of a single reactor), a signal is triggered by the steam inlet button to allow steam from at least one reactor to enter the turbine. It is then further determined whether steam from at least one reactor has entered the turbine.

[0045] It should be understood that, in order to ensure the normal operation of the steam turbine, in actual operating conditions, steam from at least one reactor must enter the steam turbine to drive its operation. Therefore, in this embodiment, the steam inlet conditions for the dual-module high-temperature gas-cooled reactor include the following three types: steam from both reactors enters the steam turbine; steam from reactor #1 enters the steam turbine, but steam from reactor #2 does not enter the steam turbine; steam from reactor #2 enters the steam turbine, but steam from reactor #1 does not enter the steam turbine.

[0046] It should be noted that in this embodiment, the reactor rate corresponding to steam entering the turbine is set as the first upward rate, and the reactor rate corresponding to steam not entering the turbine is set as the second upward rate. The first or second upward rate refers to the actual load change value output by the reactor after triggering the signal for reactor steam to enter the turbine. Therefore, when reactor steam does not enter the turbine, the second upward rate is set to 0, indicating that the reactor is not outputting actual load. When reactor steam enters the turbine, the first upward rate is set to a small value 'a', where 'a' ranges from (0.01 to 0.1)% per cycle. Based on this first upward rate, the actual load of the reactor gradually increases until 100% single-reactor full power is achieved, ensuring the accuracy of the pressure control feedforward command and preventing abrupt changes to avoid interfering with the operation of the pressure controller. Therefore, the upward rate HL matches the actual load change value, and the actual load change value should be 0-100% single-reactor full power.

[0047] Furthermore, in response to the fact that steam from both reactors enters the turbine, the corresponding rates for both reactors are the first upward rate. The target loads of each reactor are multiplied by the first upward rate to obtain two first inlet steam flow rates. These two first inlet steam flow rates are then superimposed to obtain the first flow command. In other words, the target load of one reactor is multiplied by the first upward rate to obtain one first inlet steam flow rate, and the target load of the other reactor is multiplied by the first upward rate to obtain another first inlet steam flow rate. The two first inlet steam flow rates are then superimposed to obtain the first flow command.

[0048] Furthermore, in response to the situation where steam from one reactor enters the turbine while steam from the other reactor does not, the reactor rate corresponding to the steam entering the turbine is the first upward rate. The target load of that reactor is multiplied by its first upward rate to obtain the first inlet steam flow rate. The rate of the other reactor corresponding to the situation where steam does not enter the turbine is the second upward rate. The target load of that reactor is multiplied by its second upward rate to obtain the second inlet steam flow rate. The first inlet steam flow rate and the second inlet steam flow rate are then superimposed to obtain the first flow command.

[0049] It should be noted that whether to start one or two reactors depends on the actual situation. For example, if only a single reactor needs steam inlet, one reactor can be started, and its steam can be fed into the turbine. Another example is when a steam source switch is required, steam from one reactor can be fed into the turbine first, and then steam from the other reactor can be fed into the turbine, while steam from one reactor can be discharged. Yet another example is when dual reactor steam inlet is required, both reactors can be started, and both reactors can be driven by the turbine.

[0050] It should still be noted that the control logic of step S110 is as follows: Figure 3 As shown, where, Figure 3 The first selection module SEL1 is used to select the first and second upward speeds of reactor #1. SW1 represents the steam inlet button for reactor #1. When SW1 is true, it means that the steam inlet button is in the engaged state, i.e., steam is being introduced into reactor #1, and the first selection module SEL1 outputs IN2 (first upward speed a); when SW1 is false, the steam inlet button is in the disengaged state, i.e., steam is not being introduced into reactor #1, and the first selection module SEL1 outputs IN1 (second upward speed 0).

[0051] It should still be noted that you should continue to refer to this. Figure 3 Reactor #1 is also equipped with a first rate output module RATL1. In this module, HL is the uplink rate, corresponding to the output value of the first selection module SEL1, IN is the target load of reactor #1, corresponding to (0-100%) full power of a single reactor, and AV is the first or second inlet steam flow rate obtained by multiplying the target load of reactor #1 by the first or second uplink rate.

[0052] Similarly, please continue to refer to Figure 3The third selection module SEL3 is used to select the first and second upward speeds of reactor #2. SW2 represents the steam inlet button of reactor #2. When SW2 is true, it means that the steam inlet button is in the engaged state, that is, steam is being introduced into reactor #2, and the third selection module SEL3 outputs IN2 (first upward speed a); when SW2 is false, the steam inlet button is in the disengaged state, that is, steam is not being introduced into reactor #2, and the third selection module SEL3 outputs IN1 (second upward speed 0).

[0053] For further information, please continue to refer to [link / reference]. Figure 3 Reactor #2 is also equipped with a second rate output module RATL2. HL is the uplink rate, corresponding to the output value of the third selection module SEL3. IN is the target load of reactor #2, corresponding to (0-100%) full power of a single reactor. AV is the first or second inlet steam flow rate obtained by multiplying the target load of reactor #2 by the first or second uplink rate.

[0054] For example, based on the above control logic, combined with Figure 3 The steam inlet operation for reactor #1 is as follows: Start reactors #1 and #2. When the power output of reactor #1 exceeds the preset power value, and the power output of reactor #2 does not exceed the preset power value, trigger the steam inlet button to signal that steam from reactor #1 enters the turbine. At this time, steam from the steam generator outlet of reactor #1 enters the turbine and operates under load connected to the grid (e.g., Figure 3 In the process of steam inlet for reactor #1 (SW1 is true), when steam from reactor #1 enters the turbine, the first selection module SEL1 outputs IN2 (first upward rate is a). This first upward rate is then multiplied by the target load of reactor #1 to obtain the AV value of the first rate output module RATL1, which is the first steam inlet flow rate for reactor #1. At this time, since steam from reactor #2 has not entered, the third selection module SEL3 outputs IN1 (second upward rate is 0). The target load of reactor #2 and the second upward rate 0 are multiplied to obtain the second steam inlet flow rate. Then, the first and second steam inlet flow rates are superimposed to obtain the first flow command, and this OC feedforward value is fed back to the pressure controller.

[0055] It should be understood that during the steam inlet operation of reactor #1, there is also a situation where reactor #2 is also inlet. Under this condition, the third selection module SEL3 outputs IN2 (with a first upward rate of a). The target load of reactor #2 is multiplied by the first upward rate a to obtain the first steam inlet flow rate. Then, the first steam inlet flow rate of reactor #1 is superimposed with the first steam inlet flow rate of reactor #2 to obtain the first flow command, and this OC feedforward value is fed back to the pressure controller.

[0056] For example, combined Figure 3Based on the same control logic, the steam inlet operation for reactor #2 is as follows: The startup process of reactor #2 is the same as that of reactor #1. When the steam quality at the outlet of the steam generator of reactor #2 is the same as that of reactor #1, that is, when the power of reactor #2 is greater than the preset power value (30% of the rated power of reactor #2), the steam inlet button triggers the signal for steam to enter the turbine of reactor #2. At this time, the steam at the outlet of the steam generator of reactor #2 enters the turbine (e.g., Figure 3 In the context of the No. 2 reactor steam inlet (SW2 is true), the third selection module SEL3 outputs IN2 (first upward rate is a). This first upward rate is then multiplied by the target load of the No. 2 reactor to obtain the AV value of the second rate output module RATL2, which is the first steam inlet flow rate of the No. 2 reactor.

[0057] It should be understood that during the steam intake process of reactor #2, there are also operating conditions where steam is not introduced into reactor #1 and operating conditions where steam is introduced into reactor #1. The specific control logic is the same as that of the steam intake process of reactor #1 described above, and will not be repeated here.

[0058] S120. When two reactors are running with steam turbines and steam source switching is required, one of the reactors is desteamed. A second flow command is obtained based on the steam results of the two reactors and the second flow command is fed back to the pressure controller.

[0059] It should be understood that during steam source switching, if one reactor is running with a turbine, steam from the other reactor needs to be introduced into the turbine as well. In this case, both reactors should be running with turbines. This is equivalent to the situation where both reactors are running with turbines and steam source switching is required. In this case, one reactor is de-steamed to reduce its target load. The first downward rate is set to b. The first de-steam flow rate is obtained based on the first downward rate and the target load. The first inlet steam flow rate is obtained by taking the target load of the other reactor and its first upward rate. Then, the second flow command is obtained based on the first de-steam flow rate and the first inlet steam flow rate.

[0060] It should be noted that in this embodiment, there is no specific limitation on the steam source switching operation between reactor #1 and reactor #2. It can be determined based on the actual operating conditions. It is easy to understand that when reactor #1 is fed steam and reactor #2 is de-steamed, the obtained flow rates should be the first steam inlet flow rate of reactor #1 and the first steam de-steam flow rate of reactor #2. Similarly, when reactor #2 is fed steam and reactor #1 is de-steamed, the obtained flow rates should be the first steam de-steam flow rate of reactor #1 and the first steam inlet flow rate of reactor #2.

[0061] It should be further noted that when excluding steam from reactor #1 or reactor #2, the corresponding steam inlet button for reactor #1 or reactor #2 is in the off state, meaning that steam no longer enters the turbine. At this time, the first downward speed b can be set to a small value, with the range of b being (0.01~0.1)% / cycle, to ensure the accuracy of the pressure control feedforward command and to prevent sudden changes, so as to avoid interfering with the operation of the pressure controller.

[0062] It should be noted that the control logic for step S120 should be referred to [reference needed]. Figure 3 ,in, Figure 3 The second selection module SEL2 is used to select the first and second downflow rates for reactor #1. During reactor #1 annealing, the second selection module SEL2 outputs IN1 (first downflow rate b); during reactor #1 power reduction, the second selection module SEL2 outputs IN2 (second downflow rate c). In the first rate output module RATL1, LL is the downflow rate, corresponding to the output value of the second selection module SEL2, and AV is the first or second annealing flow rate obtained by multiplying the target load of reactor #1 by the first or second downflow rate.

[0063] It should still be noted that, Figure 3 The fourth selection module SEL4 is used to select the first and second downflow rates for reactor #2. During reactor #2 descaling, SEL4 outputs IN1 (first downflow rate b); during reactor #2 power reduction, SEL4 outputs IN2 (second downflow rate c). In the second rate output module RATL2, LL is the downflow rate, corresponding to the output value of SEL4, and AV is the first or second descaling flow rate obtained by multiplying the target load of reactor #2 by the first or second downflow rate.

[0064] For example, please refer to Figure 3Taking the steam removal operation of reactor #1 as an example, after reactor #2 is introduced into the reactor, SW2 in the third selection module SEL3 is true, and both reactors #1 and #2 are running with turbines. At this time, reactor #1 is subjected to steam removal operation. The second selection module SEL2 outputs IN1 (first downward speed b), and the corresponding first belt speed output module RATL1 receives the downward speed LL signal. Then, the downward speed LL is multiplied by the target load IN value of reactor #1 to obtain the first steam removal flow rate. At this time, reactor #2 is running with turbines, and the third selection module SEL3 outputs IN2 (first upward speed a). The corresponding second belt speed output module RATL2 receives the upward speed HL signal, and the target load of reactor #2 is multiplied by its first upward speed a to obtain the first steam inlet flow rate. The first steam removal flow rate and the first steam inlet flow rate are superimposed to obtain the second flow command, i.e., the OC feedforward value, and then the OC feedforward value is fed back to the pressure controller.

[0065] For example, please continue to refer to Figure 3 Taking the steam removal operation of reactor #2 as an example, after steam is introduced into reactor #1, SW1 in the first selection module SEL1 is true, and both reactor #1 and reactor #2 are running with turbines. At this time, reactor #2 is subjected to steam removal operation, and the fourth selection module SEL4 outputs IN1 (first downward speed b). The corresponding second speed output module RATL2 receives the downward speed LL signal and multiplies the downward speed LL by the target load IN value of reactor #2 to obtain the first steam removal flow rate. At this time, reactor #1 is running with turbines, and the first selection module SEL1 outputs IN2 (first upward speed a). The corresponding first speed output module RATL1 receives the upward speed HL signal and multiplies reactor #1 by its first upward speed a to obtain the first steam inlet flow rate. The first steam removal flow rate and the first steam inlet flow rate are superimposed to obtain the second flow command, i.e., the OC feedforward value, and then the OC feedforward value is fed back to the pressure controller.

[0066] S130, the pressure controller obtains the total valve position reference value of the regulating valve based on the pressure deviation and the first flow command or the second flow command.

[0067] It should be further noted that this embodiment does not specifically limit the order of the above steps. The above steps are only used to illustrate how to realize the control process of the steam of the dual-module high-temperature gas-cooled reactor under operating conditions. The above step S130 can be executed after either step S110 or step S120. That is, the pressure controller can output the regulating valve command according to the first flow command or the second flow command obtained in steps S110 and S120 respectively.

[0068] In this embodiment, under the dual-module high-temperature gas-cooled reactor steam pressure composite control mode, the process of steam entering or exiting the turbine of one reactor does not affect the stable operation of the turbine of the other reactor. Based on the above control method, the control of steam source switching can be realized, the pressure control feedforward command can be accurately obtained, and sudden changes can be avoided. The control valve adjusts itself according to the flow command to ensure the stability of steam pressure.

[0069] Furthermore, such as Figure 2 As shown, after step S110, the control method S100 of the present invention further includes step S140:

[0070] S140. When the two reactors with steam turbines are running in step S110, and one of the reactors reduces its power, a third flow command is obtained based on the steam results of the two reactors, and the third flow command is fed back to the pressure controller. The pressure controller obtains the total valve position reference value of the control valve based on the pressure deviation and the third flow command.

[0071] It should be noted that in step S140, one of the reactor power reduction conditions includes two operating conditions: emergency shutdown power reduction and operator active power reduction. Both of these operating conditions are power reduction in the state where the steam inlet button is not turned off. At this time, the power reduction will cause the actual load of the reactor to drop rapidly. Therefore, the second downlink rate is set to a large value c, and the range of c is (1~10)% / cycle, so that the OC feedforward value can quickly respond to the change in reactor power.

[0072] Specifically, when two reactors are operating with turbines and one reactor is reducing its power, the target load of one reactor is multiplied by its second downward speed c to obtain the second exhaust steam flow rate; when the other reactor is operating with turbines, the other reactor is multiplied by its first upward speed to obtain the first inlet steam flow rate; the second exhaust steam flow rate and the first inlet steam flow rate are superimposed to obtain the third flow command. This third flow command OC will quickly respond to changes in reactor power and feed back to the pressure controller, which will execute the corresponding valve command, placing the valve at the position corresponding to the remaining reactor power, and then the pressure controller will perform fine-tuning of the pressure through feedback.

[0073] It should be further noted that, in this embodiment, there is no specific limitation on the power reduction of reactor #1 or reactor #2. For example, when reactor #1 reduces its power, the obtained data is the second exhaust steam flow rate of reactor #1 and the first inlet steam flow rate of reactor #2. When reactor #2 reduces its power, the obtained data is the second exhaust steam flow rate of reactor #2 and the first inlet steam flow rate of reactor #1.

[0074] It should be noted that the control logic for step S140 is the same as that for step S120. The difference is that the second downlink rate is set to c as (1-10)% / cycle. Please refer to the previous text for the specific logic process.

[0075] For example, please refer to Figure 3 When both reactors are running with turbines and reactor #1 is in emergency shutdown, the second selection module SEL2 outputs IN2 (second downlink rate c). The corresponding first belt rate output module RATL1 receives the downlink rate LL signal and multiplies the downlink rate LL by the target load IN value of reactor #1 to obtain the second exhaust steam flow. At this time, reactor #2 is running normally with turbines, and the third selection module SEL3 outputs IN2 (first uplink rate a). The corresponding second belt rate output module RATL2 receives the uplink rate HL signal and multiplies reactor #2 by its first uplink rate a to obtain the first inlet steam flow. The second exhaust steam flow is superimposed on the first inlet steam flow to obtain the third flow command. At this time, the remaining reactor is reactor #2, the control valve is placed at the corresponding position of reactor #2, and the pressure is finely adjusted by the feedback action of the pressure controller.

[0076] For example, please refer to Figure 3 When both reactors are running with turbines and reactor #2 is actively reducing power, the fourth selection module SEL4 outputs IN2 (second downward speed c). The corresponding second belt speed output module RATL2 receives the downward speed LL signal and multiplies the downward speed LL by the target load IN value of reactor #2 to obtain the second exhaust steam flow. At this time, reactor #1 is running normally with turbines, and the first selection module SEL1 outputs IN2 (first upward speed a). The corresponding first belt speed output module RATL1 receives the upward speed HL signal and multiplies reactor #1 by its first upward speed a to obtain the first inlet steam flow. The second exhaust steam flow is superimposed on the first inlet steam flow to obtain the third flow command. At this time, the remaining reactors are reactor #1 and reactor #2. That is, the pressure controller performs fine-tuning of the pressure based on the OC feedforward value (third flow command) and the pressure deviation.

[0077] It should be noted that the pressure deviation mentioned above is the feedback value of the pressure controller, which is obtained by subtracting the pressure setpoint of 13.24 MPa from the actual steam pressure. The first flow command, the second flow command, or the third flow command are all feedforward values ​​of the pressure controller. In other words, the steam pressure of the steam turbine is controlled by both the feedforward value and the feedback value to maintain the stable operation of the steam turbine.

[0078] It should be further noted that the first uplink rate, the first downlink rate, and the second downlink rate in this embodiment can all be adjusted according to the actual situation of the unit. There is no specific limitation on this, as long as the first uplink rate and the first downlink rate are relatively small values ​​so that the feedforward value OC has a slowly changing and non-abrupt signal, and the second downlink rate is relatively large values ​​so that the feedforward value OC can respond quickly to changes in reactor power.

[0079] In this embodiment, based on the configuration of the feedforward input OC logic of the pressure controller, when one of the reactors undergoes an emergency shutdown and active power reduction, the control valve responds quickly to the reactor power change to ensure the stability of the steam pressure.

[0080] like Figure 4 As shown, another aspect of the present invention proposes a steam source control device 200 under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode, comprising: a first acquisition module 210, used to trigger a signal for steam from at least one of the two reactors to enter the turbine when the power of at least one reactor reaches a preset power value, acquire a first flow command based on the steam intake results of the two reactors, and feed the first flow command back to the pressure controller; a second acquisition module 220, used to perform a steam removal operation on one of the reactors when the two reactors are running with the turbine and steam source switching is required, acquire a second flow command based on the steam intake results of the two reactors, and feed the second flow command back to the pressure controller; and a pressure controller 230, used to obtain a reference value for the total valve position of the regulating valve based on the pressure deviation and the first or second flow command.

[0081] In this embodiment, such as Figure 4 As shown, the control device 200 also includes a third acquisition module 240, which is used to acquire a third flow command when both reactors are running with steam turbines and one of the reactors is reducing power, and to feed the third flow command back to the pressure controller 230; the pressure controller 230 is also used to obtain the total valve position reference value of the control valve based on the pressure deviation and the third flow command.

[0082] It should be noted that in this embodiment, the control process of the steam source under the pressure composite control mode of the dual-module high-temperature gas-cooled reactor is described in the control method above. It includes the processes of steam source entry, switching, and steam source exit. The specific control process will not be described in detail here.

[0083] It should be further noted that the device embodiments described in this invention are merely illustrative. For example, the division of the modules can be a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed.

[0084] The steam source control method under the combined steam pressure control mode of a dual-module high-temperature gas-cooled reactor will be further explained below with reference to specific embodiments:

[0085] Example 1

[0086] This example illustrates a steam source control method for a dual-module high-temperature gas-cooled reactor under a combined steam pressure control mode, including the following steps:

[0087] S1. Based on the unit operation data, obtain the relationship curve between the reactor target load and the total valve position reference (output of the pressure controller), and write it into the DEH function f(x).

[0088] S2. Using the DEH system, configure the feedforward input OC logic of the pressure controller.

[0089] S3. The steam inlet signal for reactor #1 or reactor #2 is triggered by the steam inlet button. In other words, the steam inlet button is activated when the reactor steam enters the turbine.

[0090] S4. Determine whether steam from reactor #1 and reactor #2 has entered the turbine. If steam has not entered the turbine, the target load is not output by selecting the second upward speed of 0. When steam enters the turbine, the first upward speed is set to a small value (0.01% / cycle) to prevent the feedforward value OC from changing abruptly.

[0091] For example, when both reactor #1 and reactor #2 have been introduced with steam, a first flow command is obtained based on the first steam inlet flow rate of reactor #1 and the first steam inlet flow rate of reactor #2.

[0092] For example, when steam has been introduced into reactor #1 but not into reactor #2, a first flow command is obtained based on the first steam inlet flow rate of reactor #1 and the second steam inlet flow rate of reactor #2.

[0093] For example, when No steam has entered Reactor 1 but No steam has entered Reactor 2, the first flow command is obtained based on the second steam flow rate of Reactor 1 and the first steam flow rate of Reactor 2.

[0094] S5. When steam source switching is required after dual reactor startup, the target load will decrease after the steam removal operation of reactor #1 or reactor #2. The first decrease rate is set to (0.01~0.1)% / cycle. The OC will not change abruptly and will not interfere with the operation of the pressure controller.

[0095] For example, when steam has been introduced into reactor #1 and steam has been de-escalated into reactor #2, a second flow command is obtained based on the first steam inlet flow rate of reactor #1 and the first steam de-escalation flow rate of reactor #2.

[0096] For example, when steam has been introduced into reactor #2 and steam has been de-escalated into reactor #1, a second flow command is obtained based on the first steam inlet flow rate of reactor #2 and the first steam de-escalation flow rate of reactor #1.

[0097] S6. When the power of reactor #1 or reactor #2 is reduced, a larger second downward speed c (e.g., (1~10)% / cycle) is set to achieve rapid closure of the control valve, ensuring that the steam pressure does not drop, and at the same time ensuring that the pressure controller does not exit due to a large deviation between the set pressure and the actual pressure.

[0098] For example, when the two reactors are operating with steam turbines and the No. 2 reactor is reducing its power, the third flow command is obtained based on the first steam inlet flow rate of the No. 1 reactor and the second steam outlet flow rate of the No. 2 reactor.

[0099] For example, when the two reactors are operating with steam turbines and the No. 1 reactor is reducing its power, the third flow command is obtained based on the first steam inlet flow of the No. 2 reactor and the second steam outlet flow of the No. 1 reactor.

[0100] S7. The pressure controller obtains the total reference value of the valve position of the regulating valve based on the pressure deviation and the first flow command, the second flow command, or the third flow command.

[0101] This invention proposes a steam source control method and device under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode, which has the following beneficial effects:

[0102] First, in the dual-module high-temperature gas-cooled reactor steam pressure composite control mode, during the process of steam entering or leaving the turbine of one reactor, the accuracy of the pressure control feedforward command is ensured, and there are no sudden changes, so as not to affect the stable operation of the turbine of the other reactor, so as to realize the control of various operating conditions such as steam source entry, exit and steam source switching.

[0103] Second, in the dual-module high-temperature gas-cooled reactor steam pressure composite control mode, when one of the reactors reduces power or undergoes an emergency shutdown, the control valve responds quickly to changes in reactor power to ensure stable steam pressure, thereby enabling control over operator-initiated power reduction and emergency shutdown conditions.

[0104] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A steam source control method under a dual-module high-temperature gas-cooled reactor steam pressure composite control mode, characterized in that, The control method includes: When the power of at least one of the two reactors reaches the preset power value, a signal is triggered to allow steam from the at least one reactor to enter the turbine. A first flow command is obtained based on the steam intake results of the two reactors and the first flow command is fed back to the pressure controller. The process of obtaining the first flow command based on the steam inlet results of the two reactors includes: When steam from both reactors enters the turbine, the target load and the first upward speed of each reactor are multiplied to obtain two first steam inlet flow rates. The first flow rate command is obtained by superimposing the two first steam inlet flow rates; Also includes: When steam from one reactor enters the turbine while steam from the other reactor does not, the target load of one reactor is multiplied by the first upward flow rate to obtain the first steam inlet flow rate; the first upward flow rate is the reactor rate at which steam enters the turbine. Multiply the target load of the other reactor by the second upward rate to obtain the second steam inlet flow rate; the second upward rate is the reactor rate at which steam enters the turbine. The first steam inlet flow rate and the second steam inlet flow rate are superimposed to obtain the first flow rate command; When two reactors are operating with steam turbines and steam source switching is required, one of the reactors performs a steam removal operation. The target load of this reactor is multiplied by the first downward rate to obtain the first steam removal flow rate. The first downward rate is the rate when one reactor performs steam removal and the corresponding steam inlet button of the reactor is in the off state. Another reactor operates with a steam turbine. The target load of this other reactor is multiplied by the first upward speed to obtain the first steam inlet flow rate. The first exhaust steam flow rate and the first intake steam flow rate are superimposed to obtain the second flow command, and the second flow command is fed back to the pressure controller; The pressure controller obtains the total valve position reference value of the regulating valve based on the pressure deviation and the first flow command or the second flow command. The pressure deviation is the feedback value of the pressure controller, which is obtained by subtracting the pressure setpoint of 13.24 MPa from the actual steam pressure value.

2. The steam source control method under the combined steam pressure control mode of the dual-module high-temperature gas-cooled reactor according to claim 1, characterized in that, The first uplink rate is (0.01~0.1)% / cycle, and the second uplink rate is 0.

3. The steam source control method under the dual-module high-temperature gas-cooled reactor steam pressure composite control mode according to claim 1, characterized in that, The first downlink rate is (0.01~0.1)% / cycle.

4. The steam source control method under the combined steam pressure control mode of the dual-module high-temperature gas-cooled reactor according to claim 1, characterized in that, The control method further includes: When two reactors are operating with steam turbines and one reactor is reducing its power output, a third flow command is obtained based on the steam output of the two reactors and the third flow command is fed back to the pressure controller. The pressure controller obtains the total valve position reference value of the regulating valve based on the pressure deviation and the third flow command.

5. The steam source control method under the dual-module high-temperature gas-cooled reactor steam pressure composite control mode according to claim 4, characterized in that, The process of obtaining a third flow command when two reactors are operating with turbines and one reactor is reducing power includes: When two reactors are operating with steam turbines and one reactor is reducing its power, the target load of that reactor and the second downward rate are multiplied to obtain the second exhaust steam flow rate; the second downward rate is the rate when one reactor is reducing its power and the steam inlet button is not disengaged; Another reactor is running with a steam turbine. The target load of this other reactor is multiplied by the first upward rate to obtain the first steam inlet flow rate. The second exhaust steam flow rate and the first intake steam flow rate are superimposed to obtain the third flow rate command.

6. The steam source control method under the combined steam pressure control mode of the dual-module high-temperature gas-cooled reactor according to claim 5, characterized in that, The second downlink rate is (1~10)% / cycle.

7. A steam source control device for a steam source control method in the steam pressure composite control mode of a dual-module high-temperature gas-cooled reactor as described in any one of claims 1-6, characterized in that, The steam source control device includes: The first acquisition module is used to trigger a signal for steam from at least one of the two reactors to enter the turbine when the power of at least one reactor reaches a preset power value, acquire a first flow command based on the steam intake results of the two reactors, and feed the first flow command back to the pressure controller. The second acquisition module is used to perform a steam removal operation on one of the reactors when the two reactors are running with steam turbines and steam source switching is required. It acquires a second flow command based on the steam results of the two reactors and feeds the second flow command back to the pressure controller. A pressure controller is used to obtain a total valve position reference value for the control valve based on the pressure deviation and the first flow command or the second flow command.

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