Operation control method for shutdown and non-shutdown of thermal power generating unit under accident condition

Abstract

The invention belongs to the technical field of fire motors, and provides an operation control method for shutdown and non-shutdown of a thermal power generating unit under an accident working condition, and the method comprises the following steps: designing conditions for triggering and resetting the shutdown and non-shutdown working conditions; designing a large chain logic of the machine-furnace electric furnace; designing a boiler side rapid load reduction loop; designing bypass action logic and a desuperheating water regulating valve control strategy; designing main steam pressure disturbance and sliding pressure bias; optimization design of a related auxiliary machine system; according to the method, by designing triggering and resetting conditions of the working conditions of shutdown and no boiler shutdown, machine-boiler electric large chain logic, a boiler side rapid load reduction loop, bypass action logic, a desuperheating water regulating valve control strategy, main steam pressure disturbance and sliding pressure offset and optimization of related auxiliary machine systems, after a steam turbine or a power generator trips, the boiler side rapid load reduction loop can be rapidly desuperheated, and the boiler side rapid load reduction loop can be rapidly desuperheated. The boiler can still stably burn and keep the heat load stable, and steam parameters are ensured to be qualified, so that the time for restarting a unit is greatly shortened, and the operation efficiency and economic benefits of a power plant are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal power plants, in particular to an operation control method for thermal power plants to shut down without stopping the furnace under accident conditions. Background Art

[0002] At present, most domestic ultra-supercritical units are equipped with 100% BMCR high-pressure bypass and 65% BMCR low-pressure bypass. In conventional designs, after the steam turbine or generator trips, it often triggers the shutdown of the entire unit, resulting in the extinguishing of the boiler, which requires re-ignition, restart, and grid connection. This process is time-consuming and labor-intensive, which not only increases the consumption of production materials such as steam, water, oil, and electricity, increases production costs, but also has a certain impact on the regulation of the power grid.

[0003] Therefore, those skilled in the art have proposed an operation control method for stopping a thermal power unit without stopping the furnace under accident conditions to solve the problems raised by the background technology. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an operation control method for shutting down a thermal power unit without stopping the boiler under accident conditions, so as to solve the problem that in the prior art, after the steam turbine or generator trips, the entire unit is often triggered to shut down, resulting in the boiler being extinguished, and the need to re-ignite, restart, and connect to the grid. This process is time-consuming and labor-intensive, which not only increases the consumption of production materials such as steam, water, oil, and electricity, and increases production costs, but also has a certain impact on the regulation of the power grid.

[0005] The purpose of this specification is to provide an optimization method for the shutdown without stopping the boiler under accident conditions of a thermal power unit, so as to reduce the number of boiler MFTs and improve the economy of the power plant.

[0006] The content of this method includes the design of the triggering and resetting conditions for shutdown without stopping the boiler; the design of the interlocking logic of the machine, boiler and power plant; the design of the rapid load reduction circuit on the boiler side; the design of the bypass action logic and the control strategy of the desuperheating water regulating valve; the design of the main steam pressure disturbance and sliding pressure bias; and the optimization design of related auxiliary systems.

[0007] The triggering and resetting conditions for shutdown without stopping the furnace include:

[0008] Shutdown without stopping the furnace trigger (AND):

[0009] (1) Load greater than 330MW;

[0010] (2) RB input without stopping the furnace;

[0011] (3) Turbine tripping or turbine grid connection;

[0012] Shutdown without stopping the furnace reset conditions (AND):

[0013] (1) The superheater outlet pressure is less than the corresponding pressure of 330MW;

[0014] (2) 10 minutes after RB triggering;

[0015] (3) Manual reset;

[0016] The design of the large interlocking system of the boiler and power supply without stopping the boiler is:

[0017] 1) Boiler tripping: After the MFT is actuated, the MFT relay cabinet sends three hard-wired signals to the ETS cabinet (3 out of 2), triggering the steam turbine to trip;

[0018] 2) Machine tripping boiler: When the unit load is greater than 30% of the rated load and the high bypass opening is less than 5%, the steam turbine ETS sends three hard-wire signals (2 out of 3) to trigger the boiler tripping;

[0019] 3) Machine trip: After the steam turbine trips, the DEH system sends two hard-wire signals to the main steam valves to be fully closed (A-side high-pressure main steam valve MSV1 fully closed, B-side high-pressure main steam valve MSV2 fully closed, A-side medium-pressure main steam valve RSV1 fully closed, B-side medium-pressure main steam valve RSV2 fully closed (4 out of 2)) to the electrical protection panel to trigger the electrical protection action;

[0020] 4) Electric tripping: After the electrical protection is actuated, the electrical protection cabinets (A, B, C, D, E) each send 3 signals requesting closing the main steam valve to the ETS cabinet (2 out of 3) and then (1 out of 5) triggering the turbine tripping.

[0021] The logic of the bypass system is that after the boiler MFT is activated, the bypass needs to be opened quickly to release the steam channel; the bypass system has accelerated the opening logic:

[0022] High side quick opening condition (or)

[0023] (1) MFT and superheater outlet pressure is higher than 31.7 MPa;

[0024] (2) No MFT and unit load is higher than 462MW with a falling edge of 3 seconds and the turbine trips, pulse 3s;

[0025] (3) No MFT and unit load is higher than 462MW with a falling edge of 3 seconds and disconnected from the grid, pulse 3s;

[0026] High bypass quick open reset condition (or)

[0027] (1) There is no high bypass quick opening condition and the high bypass quick opening condition is triggered for 3s;

[0028] (2) There is no high bypass fast opening condition and the high bypass actual valve position feedback is greater than 70%;

[0029] Low bypass fast opening condition: high bypass valve fast opening and no low bypass fast closing condition;

[0030] Low bypass quick open reset action (or)

[0031] (1) There is no low bypass quick opening condition and the low bypass valve quick opening is triggered for 3S;

[0032] (2) There is no low bypass quick opening condition and the actual low bypass valve position is greater than 70%;

[0033] The bypass action and desuperheating water control strategy described above is that the bypass opening still needs to be adjusted in accordance with the changes in the main and re-steam pressures; when the steam turbine trips or the generator is disconnected from the grid, the bypass is triggered to open without stopping the boiler. When the current load is less than 50% of the rated load, the high bypass override opens to an opening of 0.6 times the comprehensive valve position, with a pulse of 5S, and the low bypass override opens to an opening of 1.1 times the comprehensive valve position, with a pulse of 5S; the high and low bypass pressure adjustment setting values ​​are still the current pressure setting values, and tracking and adjustment are performed to maintain stability;

[0034] When the load is 50%<load<70% rated load, the high bypass override is opened to 60%, the pulse is 5S, and the low bypass override is opened to 80%, the pulse is 8S; the high bypass pressure setting value is automatically corrected to 17Mpa, and the sliding pressure rate is set to 1Mpa / min, and the low bypass pressure setting value is automatically corrected to 2.5MPa, and the sliding pressure rate is set to 1Mpa / min, and tracking adjustment; further, the high bypass cooling water setting value is automatically corrected to 330℃, and the low bypass cooling water setting value is automatically corrected to 80℃, and tracking adjustment;

[0035] When the load is greater than 70% of the rated load, both high and low bypass valves are quickly opened to 100%, with a pulse of 1S. The high bypass pressure setting value is automatically corrected to 17Mpa, and the sliding pressure rate is set to 1Mpa / min. The low bypass pressure setting value is automatically corrected to 2.5MPa, and the sliding pressure rate is set to 1Mpa / min, and tracking adjustment is performed. Furthermore, the high bypass cooling water regulating valve sends a 10-second pulse to open, and the setting value is automatically corrected to 330℃, and the low bypass cooling water full-open setting value is automatically corrected to 80℃, and tracking adjustment is performed.

[0036] When the load is less than 50% of the rated load, the shutdown without stopping the furnace will be automatically reset 10s after the action is triggered; when the load is greater than 50% of the rated load, the high-pressure superheater outlet pressure is less than 17.5MPa or the shutdown without stopping the furnace will be automatically reset 120S after triggering; it can also be reset manually or automatically by cutting off the bypass.

[0037] The design of the RB boiler load reduction circuit and the main steam pressure disturbance sliding pressure bias is that when the actual load is greater than 70% of the rated load, the turbine trip pulse is 3S or the generator is disconnected from the grid for 3S (the DEH grid-connected signal is negated) under the CCS coordinated control mode; after the logic is triggered, the CCS target meets 330MW, the load change rate is 330MW / min, the main steam pressure setting target value is corrected to 16Mpa, and the sliding pressure rate is 1Mpa / min; the unit control module cuts off the boiler master control automatic and the steam turbine master control automatic, the unit enters the BASE control mode, the load control cuts off the AGC mode, the boiler side control center cuts off the furnace oxygen automatic, and the intermediate point temperature control is prohibited from increasing or decreasing; the overrunning cooling water pulse is turned off for 15s and switched to manual mode.

[0038] The logic and parameter correction of the related auxiliary system is to further correct the control logic of the auxiliary system; shield the water supply main control cut-off condition: the deviation between the water supply flow setting and the actual value is large (500t / h) or the speed command feedback deviation in the small machine DCS speed control loop is large (600rpm); shield the small machine remote control cut-off condition: the deviation between the small machine speed command and the actual speed is greater than 800rpm; shield the boiler negative pressure automatic cut-off condition: the instruction and feedback deviation is large (25%) or the actual pressure and the pressure setting value deviation is large (1500pa); shield the primary wind pressure automatic cut-off condition: the instruction and feedback deviation is large (30%) and the actual pressure and the pressure setting value deviation is large (5kpa) cut-off automatic condition; shield the fuel main control cut-off condition: the coal supply setting value and the actual value deviation is large (60t / h), the fuel main control is prohibited from increasing for 60s, and the upper limit is corrected to 65t / h; since the shutdown logic is triggered, the three coal mills A, C, and B are stopped in turn every 10s, and D / E / F are retained. 3 coal mills are in operation; the main control setting value of water supply is 10S for the third-order inertia time. When two steam pumps are running in parallel, the steam pump recirculation valve is slowly opened to 30% within 3 minutes, and the pulse is 185S.

[0039] The invention discloses an operation control method for stopping a thermal power unit without stopping the boiler under accident conditions. The realization of this operation mode is based on the capacity configuration of 100% high-pressure bypass + 65% low-pressure bypass and above. After the steam turbine trips or the generator is disconnected from the grid, the boiler can maintain a safe operation state by rapidly reducing the evaporation amount, that is, the shutdown without stopping the boiler condition. The method mainly includes: the design of the triggering and resetting conditions of the shutdown without stopping the boiler condition; the design of the interlocking logic of the machine, boiler and power; the design of the rapid load reduction circuit on the boiler side; the design of the bypass action logic and the control strategy of the attemperating water regulating valve; the design of the main steam pressure disturbance and the sliding pressure bias; and the optimization design of the relevant auxiliary system.

[0040] After the steam turbine trips or the generator goes off the grid, the shutdown without stopping the boiler is triggered, and the boiler MFT does not operate; the high and low pressure bypasses are quickly opened to release the pressure, release the steam channel, and avoid boiler overpressure; the bypass opening is different according to the current corresponding load and the opening is inconsistent, and the amount of bypass cooling water changes according to the bypass opening; the boiler evaporation volume is further adjusted through the RB mode, the coal supply, water supply, and total air volume are reduced to ensure stable combustion of the boiler, and the change in boiler combustion volume is also different according to the current corresponding load reduction; finally, the boiler is stabilized to more than 40% of the rated evaporation volume to maintain dry operation; the embodiment of this specification can realize the rapid startup and grid-connected operation of the thermal power generating unit and reduce thermal loss.

[0041] If any of the three main engines of a thermal power generating unit, namely the steam turbine, boiler and generator, trips, the entire unit will often be shut down due to the design of the conventional interlocking of the machine, boiler and electricity. After a conventional steam turbine or generator trips due to an accident, the boiler will immediately extinguish the fire, and it will be time-consuming and laborious to restart, ignite, run and connect to the grid, resulting in the consumption of production materials such as steam, water, oil and electricity, increased production costs, and a long time for recovery, which also has a certain impact on the regulation of the power grid. The design of the shutdown without stopping the boiler logic and auxiliary system greatly shortens the time for restarting and recovering after the steam turbine or generator trips. At the same time, since the boiler is not extinguished, the waste of production materials in the startup phase is also reduced, and the operation workload of the operating personnel is further reduced, which is extremely beneficial to the rapid recovery and grid-connected regulation of the entire unit.

[0042] The control logic of the related auxiliary system is further:

[0043] (1) Cold re-to auxiliary steam header regulating valve: the shutdown without stopping the boiler logic is activated and the steam turbine is tripped or the generator is off the grid and the small machine is started and the steam pump outlet electric door is open and the cold re-to auxiliary steam header regulating valve is less than 25% and the unit load is greater than 30% (falling edge 3 seconds) and there is no MFT; the regulating valve is overrun to 25%, pulse 5S, the auxiliary steam header pressure setting value is automatically corrected to 0.8MPa, and the setting value can be adjusted manually after a delay of 10S;

[0044] (2) The protection of the auxiliary steam to steam-driven feedwater pump steam supply isolation valve is open: the bypass is shut down without stopping the boiler and there is no MFT and the steam pump is not tripped and the outlet electric door is open and the auxiliary steam supply isolation valve is not open, pulse 10S,

[0045] (3) Condensate pump frequency control: When the bypass is shut down without stopping the boiler, the load is greater than 10% of the rated load and there is no MFT (turbine tripping or generator disconnection), the frequency is overrun to 43HZ, 30S, and automatically switched to pressure mode, the pressure setting value is 2MPa, and the setting value can be manually changed after 35S;

[0046] (4) Shaft seal steam supply regulating valve: When the bypass is shut down without stopping the boiler, the load is greater than 30% of the rated load and there is no MFT (turbine tripping or generator disconnection), the override is opened for 10S to 35%; it is automatically put into automatic, and the pressure setting value is corrected to 50kPa. After a delay of 12S, the setting value can be manually changed;

[0047] (5) Shaft seal overflow regulating valve: When the bypass is shut down without stopping the boiler, the load is greater than 30% of the rated load and there is no MFT (turbine tripping or generator disconnection), the override is closed for 10S to 0%; the automatic switch is automatic, the set value is 55%, and the delay is 12S. The set value can be changed manually;

[0048] (6) Deaerator water supply regulating valve: When the bypass is shut down without stopping the boiler, the unit load is greater than 10% of the rated load, the deaerator water level is greater than 1500mm and the condensate pump outlet main pipe pressure is lower than 1.5MPa, the steam turbine trips or the generator is disconnected from the grid and there is no MFT, the deaerator water supply regulating valve opening is locked.

[0049] An operation control system for stopping a thermal power unit without stopping the furnace under an accident condition, using the above-mentioned operation control method for stopping a thermal power unit without stopping the furnace under an accident condition, comprising:

[0050] The shutdown without stopping the furnace condition trigger and reset module is used to design and trigger the shutdown without stopping the furnace condition and design the reset conditions;

[0051] The interlocking logic module of the turbine, boiler and generator is used to redesign the interlocking logic between the turbine, boiler and generator in the unit to ensure the function of stopping the unit without stopping the boiler;

[0052] The boiler-side rapid load reduction circuit module is used to design the boiler-side rapid load reduction circuit to ensure the thermal load stability of the boiler under accident conditions and achieve safe load reduction;

[0053] The bypass action logic and desuperheating water regulating valve control strategy module is used to design the bypass action logic and the desuperheating water regulating valve control strategy to ensure the effective control and release of the steam channel and the stability of steam parameters;

[0054] The main steam pressure disturbance and sliding pressure bias module is used to design the control logic of the main steam pressure disturbance and sliding pressure bias to adjust the parameters to stabilize and prevent the boiler from over-temperature and over-pressure;

[0055] The related auxiliary system optimization module is used to optimize the control logic of the related auxiliary system to further ensure the safety of boiler feed water.

[0056] Preferably, the shutdown without stopping the furnace condition trigger and reset module design includes: the trigger condition is that the unit load is greater than the preset value, the shutdown without stopping the furnace is put into operation, the turbine is tripped or the generator is off the grid; the reset condition is that the superheater outlet pressure is less than the preset value, automatic reset within a preset time after RB is triggered, manual reset or automatic reset by cutting off the bypass.

[0057] Preferably, the design of the large interlocking logic module of the machine, boiler and electricity includes: redesigning the machine tripping and boiler tripping logic, when the unit load is greater than the preset rated load and the high-pressure bypass opening is less than the preset value, the turbine tripping signal triggers the boiler tripping; at the same time, designing the interlocking logic of the boiler tripping, the machine tripping and the electricity tripping.

[0058] Preferably, the boiler-side rapid load reduction loop module design includes: in the coordinated control mode, when the actual load is greater than the preset rated load and the turbine trips or the generator is disconnected from the grid, the RB load reduction logic is triggered, the target load and load change rate are set, the main steam pressure setting target and sliding pressure rate are adjusted, and the relevant automatic control is cut off.

[0059] Preferably, the bypass action logic and cooling water regulating valve control strategy module design includes: setting the override opening and pulse time of the high-pressure bypass and the low-pressure bypass according to the current load, and adjusting the bypass pressure setting value and sliding pressure rate, as well as the setting value and tracking adjustment of the cooling water regulating valve according to the load.

[0060] Preferably, the main steam pressure disturbance and sliding pressure bias module design includes: under shutdown but not furnace stopping conditions, adjusting the main steam pressure set value and sliding pressure rate according to load changes to maintain the stability of the main steam pressure.

[0061] Preferably, the design of the optimization module of the relevant auxiliary system includes: optimizing the control logic of auxiliary systems such as water supply main control, small machine remote control, boiler negative pressure automatic, primary air pressure automatic, fuel main control, and adding drain points and temperature measuring points to the small machine steam inlet pipe to ensure safety when switching the steam source of the small machine.

[0062] A processor is configured to execute the above-mentioned operation control method for shutting down a thermal power unit without stopping the furnace under an accident condition.

[0063] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned operation control method for shutting down a thermal power unit without stopping the furnace under an accident condition.

[0064] Compared with the prior art, the present invention has the following beneficial effects:

[0065] 1. The present invention reduces the number of boiler MFT actions, reduces the cost of startup ignition, run-up, grid connection and other processes, and reduces the waste of production materials;

[0066] 2. After the steam turbine or generator trips, the boiler can maintain a safe operating state, greatly shortening the time for the unit to restart and recover;

[0067] 3. The present invention reduces the impact on grid regulation and enhances the stability of the grid because the unit can quickly resume grid connection;

[0068] 4. The present invention reduces the operation workload of operators and improves work efficiency by optimizing control logic;

[0069] 5. The present invention avoids the risk of boiler overpressure and ensures the safe operation of the boiler by quickly opening the bypass steam release channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a schematic diagram of the operation control of the thermal power unit of the present invention for shutting down without stopping the furnace under accident conditions;

[0071] Figure 2 It is a schematic diagram of the triggering adjustment state of the shutdown without stopping the furnace action of the present invention;

[0072] Figure 3 It is a drainage design diagram for the unit to be shut down without stopping the furnace according to the present invention;

[0073] Figure 4 The invention is a framework diagram of an operation control system for shutting down a thermal power unit without stopping the furnace under accident conditions. DETAILED DESCRIPTION

[0074] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0075] like Figure 1 As shown:

[0076] Embodiment: A method for controlling the operation of a thermal power unit without stopping the furnace under an accident condition, comprising: designing an operation condition without stopping the furnace, including the design of triggering and resetting conditions of the operation condition without stopping the furnace;

[0077] Design the interlocking logic of the machine, boiler and power plant;

[0078] Design a rapid load reduction circuit on the boiler side;

[0079] Design bypass action logic and cooling water regulating valve control strategy

[0080] Design main steam pressure disturbance and sliding pressure bias;

[0081] Design optimization of related auxiliary systems;

[0082] Also includes:

[0083] The above logic and system action design is designed to ensure stable combustion of the boiler and stable thermal load of the boiler after the turbine or generator trips, and to ensure that the parameters are qualified and the unit can be started quickly;

[0084] The triggering and resetting conditions of the shutdown without stopping the furnace are designed to distinguish from other conditions and confirm the output conditions after the condition is triggered and the next action logic and equipment system;

[0085] The design of the machine, boiler and power interlocking has changed the original logic of the three main machines, ensuring the realization of the function of stopping the machine without stopping the furnace.

[0086] The design of the boiler quick load reduction circuit is to ensure the stability of the boiler's thermal load and achieve safe load reduction of the boiler instead of direct fire extinguishing, laying the foundation for the next step of quick start;

[0087] The design of bypass action and desuperheating water control strategy ensures controlled discharge of boiler steam, controlled switching of turbine steam to bypass, and maintenance of stable steam parameters;

[0088] The above 4 parts are the framework and execution steps of the shutdown without stopping the furnace function;

[0089] The design of main steam pressure disturbance and sliding pressure bias is to stabilize the adjustment parameters and ensure that the boiler will not be over-heated or over-pressured;

[0090] The optimized design of the auxiliary system also further ensures the safety of boiler feed water. These two parts further refine and improve the design of this function from the auxiliary link.

[0091] Furthermore, in the design of the rapid load reduction (RB) loop on the boiler side, a dynamic load adjustment algorithm is used to more accurately control the load change, and the formula is as follows:

[0092] P(t)=P0·e -λt +p i ·(1-e -λt );

[0093] Where P(t) is the actual load at time t; P0 is the initial load; P i is the target load; λ is the attenuation coefficient, which determines the rate of load change.

[0094] Furthermore, in order to further improve the safety and reliability of the system, a risk assessment and early warning algorithm is incorporated, that is, a Bayesian network is used to assess the risks under different failure modes. The formula is as follows:

[0095]

[0096] Among them, H represents the hypothesis (a certain failure mode); E represents the evidence (monitored abnormal data); P(H|E) is the probability that the hypothesis H is true given the evidence E.

[0097] From the above, it can be seen that an operation control method for shutting down a thermal power unit without stopping the boiler under accident conditions is implemented. By designing the triggering and resetting conditions of the shutdown condition, the machine, boiler and power interlocking logic, the boiler-side rapid load reduction circuit, the bypass action logic and the attemperation water regulating valve control strategy, the main steam pressure disturbance and sliding pressure bias, and the optimization of related auxiliary systems, the boiler can still burn stably and maintain a stable heat load after the turbine or generator trips, ensuring that the steam parameters are qualified, thereby greatly shortening the restart time of the unit and improving the operation efficiency and economic benefits of the power plant; at the same time, the method also effectively avoids the increased equipment loss and maintenance cost due to frequent starting and stopping of the boiler, and ensures the stable power supply of the power grid.

[0098] Furthermore, boundary conditions and reset conditions for triggering the operating condition are set: the conditions include the current load during the operation of the unit;

[0099] RB input without stopping the furnace;

[0100] The operating status of the steam turbine and generator;

[0101] The trigger logic action is determined according to the load. If the unit load is less than or equal to 50% of the rated load, the boiler will not trigger any logic and maintain the current boiler heat load; if the unit load is greater than 50% of the rated load, the unit will trigger the shutdown but not stop RB action.

[0102] It can be seen from the above that under the accident condition of the thermal power unit, by setting the boundary conditions and reset conditions for triggering the shutdown without stopping the boiler condition, including the current load during the operation of the unit, the input state of the shutdown without stopping the boiler RB, and the operating state of the turbine and the generator, the operating state of the unit can be controlled more accurately; in particular, the shutdown without stopping the boiler RB action will be triggered only when the unit load is greater than 50% of the rated load, which effectively avoids unnecessary operations under low load and reduces the complexity of unit operation; at the same time, when the unit load is less than or equal to 50% of the rated load, the boiler maintains the current thermal load without triggering any logic, which ensures stable operation under low load and avoids safety hazards caused by misoperation; this design not only improves the operating efficiency of the unit, but also enhances the stability and safety of the unit, providing a strong guarantee for the long-term reliable operation of the thermal power unit.

[0103] Furthermore, the design of the large interlocking of the generator and the boiler during shutdown without stopping the boiler is different from the logic of the large interlocking of the traditional units where the generator and the boiler trip each other:

[0104] The steam turbine and generator trip. Due to the design of the conventional unit startup bypass, the boiler cannot operate alone, which will inevitably lead to the action of the boiler MFT;

[0105] To realize this function, the logic design of the machine trip furnace is changed;

[0106] When the unit load is greater than 30% of the rated load and the high bypass opening is less than 5%, the steam turbine ETS sends three hard-wire signals (2 out of 3) to trigger the boiler to trip.

[0107] From the above, it can be seen that the design of the large interlocking of the machine and boiler electricity that can shut down without stopping the boiler effectively avoids the direct triggering of the boiler MFT action when the turbine or generator trips by changing the traditional logic of mutual tripping of the machine and boiler electricity, thereby ensuring the continuous and safe operation of the boiler under specific conditions; specifically, when the unit load is greater than 30% of the rated load and the high-pressure bypass opening is less than 5%, the three-way hard-wired signal (2 out of 3) of the turbine ETS will trigger the boiler trip. This design not only improves the flexibility of unit operation, but also can achieve shutdown without stopping the boiler under the premise of ensuring safety, reducing downtime and economic losses caused by accidents; at the same time, this design also helps to maintain the stability of the power grid and avoid the impact of unexpected shutdown of the unit on the power grid.

[0108] Furthermore, the logic of the bypass system for shutdown without stopping the boiler is different from the action logic of starting the bypass. After the boiler MFT is actuated, the bypass needs to be opened quickly to release the steam channel;

[0109] In addition, since there is no safety door on the boiler side, the bypass also needs to be responsible for the rapid pressure relief of boiler overpressure to ensure boiler safety;

[0110] The bypass system has been enhanced with quick-open logic.

[0111] From the above, it can be seen that the innovative design of the bypass system logic for shutdown without stopping the boiler, especially the added bypass quick-opening logic, has significantly improved the safety and response speed of the thermal power unit under accident conditions; when the boiler main fuel trip (MFT) is actuated, the bypass system can be quickly opened to effectively discharge the steam channel and prevent the damage to the boiler caused by a sharp increase in steam pressure; at the same time, since there is no safety door on the boiler side, the bypass system also assumes the function of rapid pressure relief when the boiler is over-pressured, ensuring the safe operation of the boiler; this design not only enhances the self-protection capability of the unit, but also reduces the downtime and maintenance costs caused by accidents, which is of great significance to improving the overall operating efficiency and economic benefits of thermal power units.

[0112] Furthermore, the bypass opening still needs to be adjusted in accordance with the changes in the main and re-steam pressures;

[0113] When the steam turbine trips or the generator is disconnected from the grid, the bypass is triggered to open without stopping the boiler. When the current load is less than 50% of the rated load, the high bypass override opens to 0.6 times the opening of the comprehensive valve position, with a pulse of 5S; the low bypass override opens to 1.1 times the opening of the comprehensive valve position, with a pulse of 5S; the high and low bypass pressure adjustment setting values ​​are still the current pressure setting values, and tracking adjustment is required to maintain stability;

[0114] When 50%<load<70% rated load, the high bypass override is opened to 60%, with a pulse of 5S, and the low bypass override is opened to 80%, with a pulse of 8S; the high bypass pressure setting value is automatically corrected to 17Mpa, and the sliding pressure rate is set to 1Mpa / min, the low bypass pressure setting value is automatically corrected to 2.5MPa, and the sliding pressure rate is set to 1Mpa / min, and tracking adjustment is performed.

[0115] As can be seen from the above, the bypass system flexibly adjusts its action opening according to different load conditions, and cooperates with the changes in the main and re-steam pressures, which significantly improves the response speed and stability of the thermal power unit under accident conditions; specifically, when the steam turbine trips or the generator is disconnected from the grid, resulting in the shutdown without stopping the boiler, the bypass system can respond quickly: when the current load is less than 50% of the rated load, the high bypass and low bypass are opened with appropriate opening overrides, and the current pressure setting value is maintained, effectively balancing the steam pressure; and when the load is between 50% and 70% of the rated load, the bypass system not only quickly opens to a larger opening, but also automatically corrects the pressure setting value and sets the sliding pressure rate, achieving precise control of steam parameters; this design not only speeds up the recovery process of the unit from the accident state to the stable state, but also ensures the safe operation of the boiler and turbine, effectively reducing the economic losses caused by accidents.

[0116] Furthermore, the high bypass cooling water setting value is automatically corrected to 330°C, and the low bypass cooling water setting value is automatically corrected to 80°C, and tracked and adjusted;

[0117] When the load is greater than 70% of the rated load, both high and low bypass are quickly opened to 100%, with a pulse of 1S. The high bypass pressure setting value is automatically corrected to 17Mpa, and the sliding pressure rate is set to 1Mpa / min. The low bypass pressure setting value is automatically corrected to 2.5MPa, and the sliding pressure rate is set to 1Mpa / min, and tracking adjustment is performed. Further, the high bypass cooling water is adjusted to open with a 10-second pulse, and the setting value is automatically corrected to 330℃, and the low bypass cooling water full-open setting value is automatically corrected to 80℃, and tracking adjustment is performed.

[0118] When the load is less than 50% of the rated load, the shutdown without stopping the furnace will be automatically reset 10s after the action is triggered; when the load is greater than 50% of the rated load, the high-pressure superheater outlet pressure is less than 17.5MPa or the shutdown without stopping the furnace will be automatically reset 120S after triggering; it can also be reset manually or automatically by cutting off the bypass.

[0119] It can be seen from the above that under the accident conditions of the thermal power unit, the bypass system automatically adjusts the desuperheating water set value and the bypass opening according to the load changes, and sets the corresponding sliding pressure rate, thereby realizing fine control of the steam parameters; when the load is greater than 70% of the rated load, the high and low bypasses are quickly fully opened, and the desuperheating water system responds quickly, effectively preventing the damage to the equipment caused by excessive steam temperature; when the load is low, the system ensures that the bypass system can operate stably within a safe range through automatic reset or manual intervention; this design not only improves the self-regulation ability of the unit under accident conditions, but also reduces the need for operator intervention, thereby reducing the complexity and risk of accident handling and enhancing the safety and reliability of the thermal power unit.

[0120] Furthermore, the shutdown without stopping the boiler logic action executes the RB boiler load reduction loop. In the CCS coordinated control mode, when the actual load is greater than 70% of the rated load, the turbine trip pulse is 3S or the generator is disconnected from the grid for 3S (the DEH grid-connected signal is negated);

[0121] After the logic is triggered, the CCS target meets 330MW, the variable load rate is 330MW / min, the main steam pressure setting target value is corrected to 16Mpa, and the sliding pressure rate is 1Mpa / min; the unit control module cuts off the boiler master control automatic and the steam turbine master control automatic, the unit enters the BASE control mode, the load control cuts off the AGC mode, the boiler side control center cuts off the furnace oxygen automatic, and the intermediate point temperature control is prohibited from increasing or decreasing; the overrunning cooling water pulse is turned off for 15s and switched to manual mode.

[0122] As can be seen from the above, when a thermal power unit encounters an accident condition, the shutdown without stopping the boiler logic quickly executes the RB boiler load reduction loop, especially in the CCS coordinated control mode, when the actual load exceeds 70% of the rated load and the turbine trips or the generator is disconnected from the grid, the load reduction logic can be triggered immediately; this design can quickly adjust the unit load to a safe level (such as 330MW), and reduce the load at a fast and controllable rate, while finely adjusting the main steam pressure and sliding pressure rate to ensure the stable operation of the boiler and turbine; at the same time, by cutting off multiple automatic control modules and switching to the BASE control mode, as well as manually intervening in the cooling system, this logic effectively prevents large fluctuations in parameters and ensures the safety and stability of the unit; this rapid response and fine adjustment capability significantly improves the self-protection capability of the thermal power unit under accident conditions, reduces accident losses, and ensures the continuity and stability of power supply.

[0123] Furthermore, the shielding water supply main control cut-off conditions are: the deviation between the water supply flow setting and the actual flow is large (500t / h) or the speed command feedback deviation in the small machine DCS speed control loop is large (600rpm);

[0124] Conditions for shielding small machine remote control removal: the deviation between the small machine speed command and the actual speed is greater than 800rpm;

[0125] Automatic cut-off conditions for negative pressure of shielded boiler: large deviation between instruction and feedback (25%) or large deviation between actual pressure and pressure setting value (1500pa);

[0126] Shielding the automatic cut-off conditions of primary air pressure: large deviation between instruction and feedback (30%) and large deviation between actual pressure and pressure setting value (5kpa) will cut off the automatic conditions;

[0127] Shielding fuel master control cut-off conditions: The deviation between the set value and the actual value of the coal feed rate is large (60t / h), the fuel master control is prohibited from increasing for 60s, and the upper limit is corrected to 65t / h;

[0128] From the time the shutdown without stopping the furnace logic is triggered, the three coal mills A, C, and B are stopped in sequence every 10 seconds, and the three coal mills D / E / F are kept running;

[0129] The water supply main control setting value, the third-order inertia time is 10S. When two steam pumps are running in parallel, the steam pump recirculation valve is slowly opened to 30% within 3 minutes, and the pulse is 185S.

[0130] From the above, it can be seen that under the accident conditions of the thermal power unit, by shielding the cut-off conditions of the water supply main control, small machine remote control, boiler negative pressure automatic, primary air pressure automatic and fuel main control systems, and orderly stopping the operation of some coal mills after the shutdown without stopping the boiler logic is triggered, and at the same time, finely adjusting the water supply main control set value and the opening of the steam pump recirculation valve, this series of measures effectively prevents the malfunction of the automatic control system caused by parameter deviation or equipment failure, and ensures the stable operation of the boiler during the load reduction process; at the same time, a certain number of coal mills are retained to continue to operate, ensuring the minimum heat load demand of the boiler and avoiding the risk of boiler flameout; this refined auxiliary system control strategy significantly improves the self-regulation ability and operation safety of the thermal power unit under accident conditions, and provides a strong guarantee for the rapid recovery and stable operation of the unit.

[0131] Working principle: When a thermal power unit encounters an accident condition, such as a turbine or generator tripping, the preset shutdown without stopping the boiler condition trigger condition is used to keep the boiler from tripping immediately but enter a safe operating state; this method redesigns the machine, boiler and generator interlocking logic to ensure that under certain conditions, the boiler does not shut down immediately with the tripping of the turbine or generator; at the same time, a rapid load reduction circuit is designed on the boiler side, and the boiler evaporation volume is adjusted using the RB mode to maintain stable combustion of the boiler; the bypass system is quickly opened and the steam parameters are adjusted according to the current load, and the main steam pressure disturbance and sliding pressure offset design are used to maintain the stability of the boiler parameters; at the same time, the control logic of the relevant auxiliary system is optimized to ensure water supply safety and rapid recovery of the unit, so as to achieve shutdown without stopping the boiler under accident conditions, reduce the boiler restart time, and improve the operating efficiency and economic benefits of the power plant.

[0132] The beneficial effects of the operation control method of a thermal power unit without stopping the furnace under an accident condition in this embodiment are compared with the conventional prior art (manual control of thermal power unit accidents), as shown in the following table:

[0133]

[0134]

[0135] It can be seen from the above table that the operation control method of the thermal power unit of this embodiment for shutting down without stopping the boiler under accident conditions is superior to the existing technology in terms of unit shutdown response, boiler restart time, production materials consumption, power grid impact, safety, equipment loss and maintenance cost, automation and intelligence level, flexibility and adaptability, auxiliary system control optimization, steam parameter stability, and economic and social benefits. This method is suitable for large-scale promotion and application.

[0136] In summary: this technology has the following beneficial effects:

[0137] 1) Reduce boiler restart time: Through the operation control method of stopping the machine without stopping the boiler, the boiler can be kept burning after the turbine or generator trips, avoiding time-consuming and laborious processes such as re-ignition, restarting, and grid connection, thereby significantly reducing the restart time of the boiler;

[0138] 2) Improve the economic efficiency of power plants: Reducing the time it takes to restart boilers means reducing the consumption of production materials such as steam, water, oil, and electricity, thereby improving the economic efficiency of power plants;

[0139] 3) Enhanced grid stability: This technology avoids the impact on the grid caused by frequent boiler starts and stops, and enhances the stability of the grid;

[0140] 4) Improve equipment service life: Reducing the number of boiler starts and stops helps reduce equipment wear and fatigue, thereby extending the service life of the equipment;

[0141] 5) Improve emergency response capability: In the event of an accident, this technology can respond quickly and maintain stable operation, improving the emergency response capability of the unit;

[0142] 6) Simplify the operation process: Through the automated control system and optimized control logic, the operation process of the operator is simplified and the risk of misoperation is reduced;

[0143] 7) Enhanced system flexibility: This technology allows the boiler to be kept running under certain conditions, enhancing the operational flexibility of the unit;

[0144] 8) Ensure safe operation: Through precise parameter control and optimized auxiliary system logic, the safe operation of the unit under accident conditions is guaranteed;

[0145] 9) Strong adaptability: This technology can be applied to different types of thermal power units and has strong versatility and adaptability;

[0146] 10) Improve the automation level: Through the integrated control system and computer program, the automation level of the unit is improved, laying the foundation for future intelligent upgrades.

[0147] The above embodiment is further described below in conjunction with the accompanying drawings and descriptions:

[0148] like Figure 2 As shown in the figure, the shutdown without stopping the furnace action triggers the opening of high-pressure bypass 1 and low-pressure bypass 2. When the current load is less than 50% of the rated load, the high bypass valve 1 is overrun to open to 0.6 times the opening of the comprehensive valve position, the pulse is 5S, and the low bypass valve 2 is overrun to open to 1.1 times the opening of the comprehensive valve position, the pulse is 5S; the pressure adjustment setting value of the high bypass valve 1 and the low bypass valve 2 is still the current pressure setting value, tracking and adjusting to maintain the current pressure;

[0149] When the load is 50%<load<70% rated load, the high bypass valve 1 is overrun to 60%, the pulse is 5S, and the low bypass valve 2 is overrun to 80%, the pulse is 8S; the high bypass valve pressure setting value is automatically corrected to 17Mpa, and the sliding pressure rate is set to 1Mpa / min, and the low bypass valve 2 pressure setting value is automatically corrected to 2.5MPa, and the sliding pressure rate is set to 1Mpa / min, and tracking adjustment; further, the high bypass cooling water regulating valve 3 setting value is automatically corrected to 330℃, and the low bypass cooling water regulating valve 4 setting value is automatically corrected to 80℃, and tracking adjustment;

[0150] When the load is greater than 70% of the rated load, the high bypass valve 1 and the low bypass valve 2 are both opened quickly to 100%, with a pulse of 1S. The pressure setting value of the high bypass valve 1 is automatically corrected to 17Mpa, and the sliding pressure rate is set to 1Mpa / min. The pressure setting value of the low bypass valve 2 is automatically corrected to 2.5MPa, and the sliding pressure rate is set to 1Mpa / min, and tracking adjustment is performed. Further, the high bypass cooling water regulating valve 3 is opened by a 10-second pulse, and the setting value is automatically corrected to 330℃, the low bypass cooling water regulating valve 4 is fully opened and the setting value is automatically corrected to 80℃, and tracking adjustment is performed.

[0151] like Figure 3 As shown: In order to realize the function of shutting down the unit without stopping the furnace, the steam source of the small unit needs to be switched quickly. During normal operation, the steam source of the small unit is supplied by a four-stage steam extraction pipeline. When the turbine trips and triggers the shutdown without stopping the furnace function, when the four-stage steam extraction is lost, the steam supply valve from the auxiliary steam header to the small unit must be opened quickly, and at the same time, the pneumatic regulating valve from the cold to the auxiliary steam header is opened to 25%, and the target pressure is automatically set to 0.8Mpa to ensure that the opening speed and flow rate meet the minimum requirements of the small unit steam source switching moment; in addition, the pipeline system related to the small unit steam source switching must have sufficient drainage, and the drainage pipe diameter design must meet the requirements that when the steam is not circulating in the pipeline, the steam parameters in the pipeline can always meet the use requirements of the small unit; the pipe diameter design should be no less than Φ57mm.

[0152] The drainage design of the steam inlet pipe of the small machine is not perfect, such as Figure 3 As shown, a drain point 3 is added to the steam inlet pipe of the small machine with four extractions; a drain point 5 is added to the front of the steam supply valve of the small machine and a drain point 6 is added to the back of the valve; auxiliary steam is added to the drain point 7 in front of the steam supply valve of the small machine and a drain point 8 behind the valve; cold steam is added to the drain point 10 in front of the steam supply valve of the small machine. If the drain cannot extract the cold steam in the pipeline out of the system during the switching process, it will make the switching of the steam source very difficult; it is easy to cause cold steam and cold water to enter the small machine, sudden change of axial displacement, and burning of thrust bearings, which is very risky.

[0153] Therefore, the above-mentioned drains are added and steam temperature measuring points are added in the pipeline at each drain. When the temperature after the drain valve 1-11 is less than 60℃, the drain valve is interlocked to open, and when the drain temperature is greater than 150℃, the drain valve is interlocked to close. At the same time, when the turbine trips and triggers the shutdown without stopping the boiler function, the drain valves 1-11 are quickly opened, thereby ensuring that when the steam source of the small machine is switched, the small machine works normally, the boiler water supply is not interrupted, and the safe operation of the boiler is ensured.

[0154] Working principle:

[0155] An operation control system for a thermal power unit that shuts down without stopping the furnace under accident conditions, such as Figure 4 As shown, the operation control method for stopping the power plant without stopping the furnace under the above-mentioned accident condition comprises:

[0156] The shutdown without stopping the furnace condition trigger and reset module is used to design and trigger the shutdown without stopping the furnace condition and design the reset conditions;

[0157] The interlocking logic module of the turbine, boiler and generator is used to redesign the interlocking logic between the turbine, boiler and generator in the unit to ensure the function of stopping the unit without stopping the boiler;

[0158] The boiler-side rapid load reduction circuit module is used to design the boiler-side rapid load reduction circuit to ensure the thermal load stability of the boiler under accident conditions and achieve safe load reduction;

[0159] The bypass action logic and desuperheating water regulating valve control strategy module is used to design the bypass action logic and the desuperheating water regulating valve control strategy to ensure the effective control and release of the steam channel and the stability of steam parameters;

[0160] The main steam pressure disturbance and sliding pressure bias module is used to design the control logic of the main steam pressure disturbance and sliding pressure bias to adjust the parameters to stabilize and prevent the boiler from over-temperature and over-pressure;

[0161] Related auxiliary system optimization module is used to optimize the control logic of related auxiliary systems to further ensure the safety of boiler feed water.

[0162] The embodiment of the present application provides an electronic device, which is applicable to the operation control method of shutting down the above-mentioned thermal power unit without stopping the furnace under the accident condition, including:

[0163] Memory, used to protect computer programs and data;

[0164] Processor, used to run system programs.

[0165] The embodiment of the present application provides a computer storage medium, which is applicable to the operation control method of shutting down the thermal power unit without stopping the furnace under accident conditions, and performs hierarchical confidentiality management on the above-mentioned system and data in accordance with confidentiality management requirements.

[0166] Those skilled in the art will appreciate that the embodiments of the present application may be provided as a system or a computer program product. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0167] The present application is described with reference to the flowcharts and / or block diagrams of the devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0168] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0169] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0170] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0171] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0172] Computer readable media include permanent and non-permanent, removable and non-removable media, and can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0173] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, commodity or device including the elements.

[0174] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for controlling the operation of a thermal power unit during shutdown without stopping the furnace under accident conditions, characterized in that: include: S1. Design the triggering and resetting conditions of shutdown without stopping the furnace, including unit load, shutdown without stopping the furnace RB input status, and the operating status of the steam turbine and generator; S2. Design the interlocking logic of the machine, boiler and generator to ensure that when the steam turbine or generator trips, the boiler does not trip immediately but maintains a safe operating state; S3. Design a rapid load reduction circuit on the boiler side to adjust the boiler evaporation capacity through the RB mode to maintain stable boiler combustion; S4. Design bypass action logic and desuperheating water regulating valve control strategy to ensure rapid opening of steam channel and adjust steam parameters; S5. Design main steam pressure disturbance and sliding pressure bias to ensure boiler parameter stability; S6. Optimize the control logic of related auxiliary systems to ensure water supply safety and rapid recovery of the unit.

2. The operation control method for a thermal power unit that shuts down without stopping the furnace under an accident condition as claimed in claim 1, characterized in that: The triggering conditions of the shutdown without stopping the furnace working condition include: the unit load is greater than 50% of the rated load, the shutdown without stopping the furnace RB is put into operation, and the turbine trips or the generator is disconnected from the grid.

3. The operation control method for a thermal power unit that shuts down without stopping the furnace under an accident condition as claimed in claim 1, characterized in that: The boiler-turbine interlocking logic is designed as follows: when the unit load is greater than 30% of the rated load and the high bypass opening is less than 5%, the three-way hard-line signal from the steam turbine ETS triggers the boiler to trip.

4. The operation control method for a thermal power unit that shuts down without stopping the furnace under an accident condition as claimed in claim 1, characterized in that: The logic of the bypass system includes a quick opening logic to ensure that the bypass is quickly opened to release the steam channel when the boiler MFT is activated or under certain load conditions.

5. The operation control method for a thermal power unit that shuts down without stopping the furnace under an accident condition as claimed in claim 1, characterized in that: Under the condition of shutting down but not stopping the boiler, the bypass opening and the regulation of cooling water are adjusted according to the current load to maintain the stability of steam parameters.

6. The operation control method for a thermal power unit that shuts down without stopping the furnace under an accident condition as claimed in claim 1, characterized in that: The control logic optimization of the related auxiliary system includes the cut-off conditions of shielding water supply main control, small machine remote control, boiler negative pressure automatic, primary air pressure automatic and fuel main control, and adjusting the operating status of coal mill and steam pump recirculation regulating valve equipment.

7. An operation control system for thermal power units that can shut down without stopping the furnace under accident conditions, characterized in that: The operation control method for a thermal power unit according to any one of claims 1 to 6, comprising: The shutdown without stopping the furnace condition trigger and reset module is used to design and trigger the shutdown without stopping the furnace condition and design the reset conditions; The interlocking logic module of the turbine, boiler and generator is used to redesign the interlocking logic between the turbine, boiler and generator in the unit to ensure the function of stopping the unit without stopping the boiler; The boiler-side rapid load reduction circuit module is used to design the boiler-side rapid load reduction circuit to ensure the thermal load stability of the boiler under accident conditions and achieve safe load reduction; The bypass action logic and desuperheating water regulating valve control strategy module is used to design the bypass action logic and the desuperheating water regulating valve control strategy to ensure the effective control and release of the steam channel and the stability of steam parameters; The main steam pressure disturbance and sliding pressure bias module is used to design the control logic of the main steam pressure disturbance and sliding pressure bias to adjust the parameters to stabilize and prevent the boiler from over-temperature and over-pressure; The related auxiliary system optimization module is used to optimize the control logic of the related auxiliary system to further ensure the safety of boiler feed water.

8. A processor, characterized in that: The method is configured to execute the operation control method of shutting down a thermal power unit without stopping the furnace under an accident condition according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the operation control method for shutting down a thermal power unit without stopping the furnace under an accident condition of any one of claims 1 to 6 is implemented.

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