Back pressure and bypass heat supply safety protection control method and device

Abstract

The application discloses a back pressure and bypass heat supply safety protection control method and device, wherein the method comprises the following steps: according to a first group of preset conditions, carrying out lock control on the increase and decrease operation of a first group of specified valve positions, and triggering corresponding sound and light alarms; according to a second group of preset conditions, carrying out automatic cutting operation on the increase and decrease operation of a second group of specified valve positions; according to a third group of preset conditions, triggering a unit low alarm; according to a fourth group of preset conditions, triggering a unit low interlocking trip; according to a fifth group of preset conditions, carrying out corresponding interlocking control on a third group of specified valve positions, and according to the interlocking control operation, prompting an operator whether to restore the valve position which has carried out the automatic cutting operation; and according to a sixth group of preset conditions, carrying out corresponding interlocking control on the third group of specified valve positions. The application can reduce the influence of each heat supply working condition switching on the unit and the heat network, and enhance the safety and reliability of the back pressure and bypass combined heat supply system operation.

Description

Technical Field

[0001] This invention relates to the field of back pressure and bypass heating technology for cogeneration turbines, and particularly to a method and device for safety protection and control of back pressure and bypass heating. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] During the heating season, steam turbines operate in three heating modes: extraction, back pressure, and bypass. These three modes can meet the different demands of heat and power loads during the heating season, greatly improving the operational flexibility of thermal power units and truly achieving heat and power decoupling. Extraction heating is the conventional operating mode for cogeneration units during the heating season, and the heating steam is generally provided by the exhaust steam from the intermediate-pressure cylinder of the steam turbine. Switching between extraction and back pressure heating modes is mainly accomplished by operating the SSS clutch connecting the intermediate-pressure rotor and the low-pressure rotor. However, this design increases the overall shaft system complexity of the steam turbine generator unit. During the switch from extraction to back pressure heating, the exhaust pressure of the intermediate-pressure cylinder increases instantaneously, causing severe disturbances to the intermediate-pressure cylinder pressure ratio. Similarly, the switch from back pressure to extraction heating also interferes with the intermediate-pressure cylinder pressure ratio, affecting the safe operation of the unit. The frequent switching between extraction steam or back pressure heating mode and bypass heating mode leads to frequent changes in the operating and safety parameters of the turbine body, bypass and heating network. If the above parameters are not controlled, alarmed and limited in time, in extreme cases, various safety parameters may exceed the limits and damage the equipment, affecting the heating stability and safety under deep peak shaving of the unit. Summary of the Invention

[0004] This invention provides a back-pressure and bypass heating safety protection and control method to reduce the impact of switching between various heating conditions on the unit and heating network, and to enhance the safety and reliability of the back-pressure and bypass combined heating system. The method includes:

[0005] According to the first set of preset conditions, the first set of specified valve position increase / decrease operations are locked and controlled, and the corresponding audible and visual alarms are triggered. According to the second set of preset conditions, the second set of specified valve position increase / decrease operations are automatically cut off.

[0006] According to the third set of preset conditions, the unit's low alarm is triggered; according to the fourth set of preset conditions, the unit's low interlock trip is triggered.

[0007] Based on the fifth set of preset conditions, the corresponding interlock control is performed on the designated valve position of the third group. Based on the interlock control operation, the operator is prompted whether to restore the valve position that has been automatically cut off. Based on the sixth set of preset conditions, the corresponding interlock control is performed on the designated valve position of the third group.

[0008] This invention also provides a back pressure and bypass heating safety protection control device to reduce the impact of switching between various heating conditions on the unit and heating network, and to enhance the safety and reliability of the back pressure and bypass combined heating system. This device is used to execute the above-mentioned back pressure and bypass heating safety protection control method.

[0009] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned back pressure and bypass heating safety protection control method.

[0010] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned back pressure and bypass heating safety protection control method.

[0011] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the aforementioned back pressure and bypass heating safety protection control method.

[0012] In this embodiment of the invention, the addition and subtraction operations of a first group of designated valve positions are interlocked according to a first set of preset conditions, triggering corresponding audible and visual alarms. The addition and subtraction operations of a second group of designated valve positions are automatically cut off according to a second set of preset conditions. A low-level alarm is triggered based on a third set of preset conditions, and a low-level interlock trip is triggered based on a fourth set of preset conditions. Interlock control is applied to the designated valve positions of a third group according to a fifth set of preset conditions, and the operator is prompted whether to restore the valve positions that have undergone automatic cut-off. Interlock control is also applied to the designated valve positions of a third group according to a sixth set of preset conditions. In the above process, this embodiment of the invention performs corresponding valve position addition and subtraction operations and interlock control on designated valve positions based on multiple sets of preset conditions, thereby reducing the impact of switching between various heating conditions on the unit and the heating network, and enhancing the safety and reliability of the back pressure and bypass combined heating system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0014] Figure 1 This is a flowchart of the back pressure and bypass heating safety protection control method in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the back pressure and bypass heating safety protection control method in an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the valve position interlocking control mode for valves 2 and 4 in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the valve position interlocking control mode for valves 9 and 11 in an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the valve position interlocking control mode for valves 15 and 18 in an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the unit S2 low alarm and interlocking trip control mode in an embodiment of the present invention;

[0020] Figure 7 This is a schematic diagram of the interlocking control mode in an embodiment of the present invention; Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0022] The following is an explanation of the key terms.

[0023] 1. Pure condensing operation: For cogeneration units, all the steam discharged from the intermediate pressure cylinder of the turbine enters the low pressure cylinder through the intermediate and low pressure cylinder connecting pipe to generate electricity.

[0024] 2. Steam extraction heating operation: For cogeneration units, part of the steam discharged from the intermediate pressure cylinder of the turbine enters the low pressure cylinder through the intermediate and low pressure cylinder connecting pipe to continue to do power generation, and the other part enters the heat exchanger of the heat network through the steam extraction pipeline for heat exchange and heating.

[0025] 3. SSS (Synchro-self-shifting) clutch: The SSS clutch is a purely mechanical device. When the input speed tends to exceed the output speed, the clutch engages, and the output speed is driven. When the input speed tends to decrease relative to the output speed, a reverse torque is generated, and the clutch disengages. In a heating turbine, the low-pressure rotor is connected to the input end of the SSS clutch, and the intermediate-pressure rotor is connected to the output end, realizing the disengagement and engagement of the two rotors. Disengagement and engagement cannot be achieved in the locked state.

[0026] 4. Back pressure heating condition: For cogeneration units, all the steam discharged from the intermediate pressure cylinder of the steam turbine enters the heat exchanger of the heat network for heat exchange. The valve of the connecting pipe between the intermediate and low pressure cylinders is closed to isolate the steam from the low pressure cylinder. The low pressure rotor relies on the SSS clutch to disengage from the intermediate and high pressure rotors and coast to low speed rotation.

[0027] 5. Bypass heating mode: For cogeneration units, the high-pressure heating bypass and low-pressure heating bypass of the steam turbine are connected in series and put into operation at the same time. This allows a portion of the main steam from the boiler to pass through the high-pressure heating bypass and the low-pressure heating bypass in sequence to reduce the temperature and pressure, and then merge with the heating extraction steam discharged from the intermediate pressure cylinder to enter the heating network heater for heat exchange.

[0028] 6. Intermediate pressure cylinder pressure ratio: This is the ratio of the inlet steam pressure to the outlet steam pressure of the intermediate pressure cylinder. It is an important parameter for the safe operation of a steam turbine. If this value exceeds its upper or lower limit, it will trigger the turbine trip protection.

[0029] 7. Coasting and follow-up speed: When switching from extraction steam heating to back pressure heating, the low-pressure cylinder rotor starts to slow down from the rated speed. This process is called coasting. The stable speed that the low-pressure cylinder rotor can maintain after coasting is called the follow-up speed.

[0030] Figure 1 This is a flowchart of the back pressure and bypass heating safety protection control in an embodiment of the present invention. The method includes:

[0031] Step 101: According to the first set of preset conditions, the first set of specified valve position increase / decrease operations are locked and controlled, and the corresponding audible and visual alarms are triggered. According to the second set of preset conditions, the second set of specified valve position increase / decrease operations are automatically cut off.

[0032] Step 102: Trigger the low alarm of the unit according to the third set of preset conditions, and trigger the low interlock trip of the unit according to the fourth set of preset conditions.

[0033] Step 103: Perform corresponding interlock control on the designated valve position of the third group according to the fifth group of preset conditions, and prompt the operator whether to restore the valve position that has been automatically cut off according to the interlock control operation. Perform corresponding interlock control on the designated valve position of the third group according to the sixth group of preset conditions.

[0034] In step 101, the first set of specified valve position increase / decrease operations are locked according to the first set of preset conditions, and the corresponding audible and visual alarms are triggered. The second set of specified valve position increase / decrease operations are automatically cut off according to the second set of preset conditions.

[0035] In one embodiment, before performing interlocking control on the first set of specified valve position increment / decrement operations according to the first set of preset conditions, the method further includes:

[0036] When all execution conditions are met, the operation execution state is initiated, and the operation process is executed.

[0037] If any of the execution conditions are not met during the operation process, the operation process will be paused.

[0038] Figure 2 This is a schematic diagram of the back pressure and bypass heating safety protection control method in an embodiment of the present invention, which includes the following main equipment, valve positions, and meter names:

[0039] A) Boiler superheater; B) High-pressure cylinder; C) Boiler reheater; D) Low-pressure bypass system for turbine start-up and shutdown; E) Intermediate-pressure cylinder; F) SSS clutch; G) Low-pressure cylinder; G A Low-pressure cylinder final stage; H A Winter circulating cooling water pump system; H B Summer circulating cooling water pump system; H C Cooling tower system; I) ​​Condenser; I A I) Throat; J) Condensate pump group; K A #1 Heating Network Drainage Booster Pump Set; K B #2 Heat network condensate booster pump set; L) Condensate treatment, heating, and boosting system; M) Heat network users; N) M circulating water pump group; O) Heat network heater and condensate cooler system; P) Feedwater system; Q) Generator; R) Shaft seal steam supply system; S) Lubricating oil pump system; T) Low-pressure cylinder top shaft oil pump system; U) Control oil pump system; V) Vacuum pump system; W) I water replenishment system; X) Emergency drainage ditch; Y) Turning gear;

[0040] 1) Main steam shut-off valve; 2) Main steam regulating valve; 3) 4 upstream shut-off valve; 3.1) 3 bypass pre-opening shut-off valve; 4) High-pressure heating bypass steam regulating valve; 5) 6 upstream shut-off valve; 6) High-pressure heating bypass desuperheating water regulating valve; 7) High-pressure exhaust steam inlet A check valve; 8) Reheat steam shut-off valve; 9) Reheat steam regulating valve; 10) 11 upstream shut-off valve; 10.1) 10 bypass pre-opening shut-off valve; 11) Low-pressure heating bypass steam regulating valve; 12) 13 upstream shut-off valve ;13) Low-pressure heating bypass desuperheating water regulating valve;14) 11 downstream shut-off valve;15) Intermediate exhaust heating steam extraction regulating valve;15.1) 15 bypass shut-off valve;16) Intermediate exhaust heating steam extraction check valve;17) Intermediate exhaust inlet G steam shut-off valve;18) Intermediate exhaust inlet G steam regulating valve;19) 21 bypass shut-off valve;20) 21 upstream shut-off valve;21) 3 upstream steam trap;22) 21 downstream shut-off valve;23) 25 bypass shut-off valve;24) 25 upstream shut-off valve;25) 4. Upstream steam trap; 26) 25. Rear shut-off valve; 27) 29. Bypass shut-off valve; 28) 29. Front shut-off valve; 29) 10. Upstream steam trap; 30) 29. Rear shut-off valve; 31) 33. Bypass shut-off valve; 32) 33. Front shut-off valve; 33) 11. Upstream steam trap; 34) 33. Rear shut-off valve; 35) 37. Bypass shut-off valve; 36) 37. Front shut-off valve; 37) 14. Downstream steam trap; 38) 37. Rear shut-off valve; 39) 41. Bypass shut-off valve; 40) 41) Upstream shut-off valve; 41) 17) Upstream steam trap; 42) 41) Downstream shut-off valve; 43) 45) Bypass shut-off valve; 44) 45) Upstream shut-off valve; 45) 18) Upstream steam trap; 46) 45) Downstream shut-off valve; 47) J) Recirculation line regulating valve; 48) J) Outlet main regulating valve; 49) M) Circulating water outlet shut-off valve; 50) M) Circulating water inlet shut-off valve; 51) N) Recirculation line shut-off valve; 52) Heat network heater drain side #1 level regulating valve; 53) K A Recirculation line regulating valve; 53-1) 53 to #1 heating network heater shut-off valve; 53-2) 53 to #2 heating network heater shut-off valve; 54) K A Emergency water discharge shut-off valve; 55)K A 56) Shut-off valve L; 57) Level regulating valve #2 on the drain side of the heating network heater; B Recirculation line regulating valve; 57-3) 57 to #3 heating network heater shut-off valve; 57-4) 57 to #4 heating network heater shut-off valve; 58) K B Emergency water discharge shut-off valve; 59)K B To L shut-off valve; 60)G A Spray shut-off valve; 61)I A Water curtain spray shut-off valve; 62)I water supply shut-off valve; 63)I water supply regulating valve; 64)I drain shut-off valve; emergency drain shut-off valves on the drain side of each heating network heater in X-1, X-2, X-3, X-4)O.

[0041] T1) High-pressure heating bypass desuperheating water temperature; T2) A steam temperature; T3) Low-pressure heating bypass desuperheating water temperature; T4) C steam temperature; T5) High-pressure heating bypass to C steam temperature; T6) Low-pressure heating bypass to heating network main pipe steam temperature; T7) High-pressure exhaust to A steam temperature; T8) Medium exhaust steam temperature; T9, T 10 )G A Stator component metal temperature; T 11 T 12 )G A Steam temperature; T 13 Steam inlet temperature of the heating network main pipe; T 14 L supplies cooling to user temperature; T 15 T 16 T 17 T 18 The outlet temperature of circulating water for each branch of the heating network within the O-type heating network; T 混 O heating network user circulating water outlet temperature; T 19 O heating network user circulating water inlet temperature; T 20 The temperature of bearing #1 of Q; T 21 The oil return temperature of the #1 support bearing of Q; T 22 Temperature of bearing #2 in Q; T 23 The oil return temperature of bearing #2 in Q; T 24 B and E thrust bearing working surface temperatures; T 25 Temperature of the non-working surfaces of thrust bearings B and E; T 26 B and E thrust bearing return oil temperature; T 27 Temperature of bearing #1 in bearings B and E; T 28 Oil return temperature of bearing #1 in bearings B and E; T 29 Temperature of bearing #2 in bearings B and E; T 30 Oil return temperature of bearing #2 in bearings B and E; T 31 Intermediate rotor support bearing temperature; T 32 Intermediate rotor support bearing return oil temperature; T 33 F return oil temperature; T 34 Temperature of bearing #1 in bearing G; T 35 The oil return temperature of bearing #1 in bearing G; T 36 Temperature of bearing #2 in bearing G; T 37 The oil return temperature of bearing #2 in bearing G; T 38 )G thrust bearing working surface temperature; T 39 )G Thrust bearing non-working surface temperature; T 40 )G thrust bearing return oil temperature; T 41P1) Low-pressure shaft seal steam supply temperature; P2) High-pressure heating bypass desuperheating water pressure; P3) Low-pressure heating bypass desuperheating water pressure; P4) C steam pressure; P5) High-pressure heating bypass to A steam pressure; P6) Low-pressure heating bypass to heating network main pipe steam pressure; P7) B regulating stage steam pressure; P8) E inlet steam pressure; P9) Intermediate exhaust steam pressure; P 10 G is the inlet steam pressure; P is the outlet steam pressure. 11 P 12 )G A Steam pressure; P 13 J outlet main pipe pressure; P 14 Steam pressure at the heating network inlet; P 15 )K A Outlet header pressure; P 16 )K B Outlet header pressure; P 17 The pressure after condensate treatment and heating; P 18 L supplies cooling pressure to users; P 19 M Circulating water outlet pressure; P 20 M Circulating water inlet pressure; P 21 R main pipe pressure; P 22 S is the oil supply pressure at the center of the turbine rotor; P 23 )S filter screen pressure difference; P 24 T outlet header pressure; P 25 F1) High-pressure heating bypass desuperheating water flow rate; F2) High-pressure heating bypass inlet steam flow rate; F3) Low-pressure heating bypass desuperheating water flow rate; F4) Low-pressure heating bypass inlet steam flow rate; F5) B inlet steam flow rate; F6) E inlet steam flow rate; F7) J outlet header flow rate; F8) K A Outlet main pipe flow rate; F9)K B Outlet main pipe flow rate; F 10 M) Circulating water flow rate; S1) Rotor speed of B and E; S2) Rotor speed of G; Z1) Rotor shaft displacement of B and E; Z2) Rotor expansion difference of B and E; Z3) Misalignment of the two rotors on both sides of F; Z4) Rotor expansion difference of G; Z5) Rotor shaft displacement of G; Z6) Rotor eccentricity of G; V1) Rotor vibration at the #1 support bearing of Q; V2) Rotor vibration at the #2 support bearing of Q; V3) Rotor vibration at the #1 support bearing of B and E; V4) Rotor vibration at the #2 support bearing of B and E; V5) Rotor vibration at the support bearing of the intermediate rotor; V6) Rotor vibration at the #1 support bearing of G; V7) Rotor vibration at the #2 support bearing of G; H1, H2, H3, H4) Liquid level on the drain side of each heater in the heating network in O; H5) Liquid level of I; M1) Load of Q;

[0042] In a specific embodiment, the execution permission conditions include:

[0043] (1) All thermal measurement points meet the requirements: including temperature, pressure, flow rate, speed, shaft displacement, expansion difference, misalignment, eccentricity, vibration, liquid level, load and other measurement points related to the back pressure and bypass combined heating system, as well as related valves (such as open, closed, valve position feedback, etc.), equipment speed control devices (such as hydraulic coupling scoop tube valve position, frequency converter frequency, etc.), SSS clutches (such as disengagement, engagement, locking, unlocking feedback, etc.) and other feedback points that are not defective.

[0044] (2) The original steam extraction and heating operation signal of the unit has been triggered.

[0045] (3) The following K A K B All normal operating conditions are met: 1) K A K B 1) The preset number of heating network condensate booster pumps (e.g., 1) are running, and the corresponding inlet / outlet shut-off valve open feedback signal has been triggered while the close feedback signal has not been triggered; 2) The automatic control key of the running heating network condensate booster pump speed control device has been changed to the active position; 3) K A K B 4) The standby pump interlock start key has been changed to the active position; 5) The automatic control keys 52, 53, 56, and 57 have been changed to the active position; 5) The feedback signal is off and the feedback signal is not triggered in 54 and 58; 6) The feedback signal is on and the feedback signal is off in 55 and 59.

[0046] (4) All of the following normal operating conditions for N are met: 1) The preset number (e.g., ≥1 and ≤4) of circulating water pumps M within N are running, and the corresponding inlet / outlet shut-off valve open feedback signal has been triggered while the close feedback signal has not been triggered; 2) The automatic control key of the running circulating water pump speed regulating device has been changed to the active position; 3) The interlock start key of the standby pumps of N has been changed to the active position, and the start sequence of each standby pump within N has been pre-selected; 4) The open feedback signals of 49 and 50 have been triggered while the close feedback signal has not been triggered; 5) The close feedback signal of 51 has been triggered while the open feedback signal has not been triggered, and the interlock open key has been changed to the active position, with the interlock open condition being P. 19 If the value is less than or equal to the preset safety lower limit (e.g., 0.25 MPa), the reset condition is P. 19 ≥Preset lower limit (e.g., 0.45 MPa); 6)Preset safety upper limit (e.g., 0.5 MPa) ≥ P 19 ≥ Preset lower safety limit (e.g., 0.3 MPa.a); 7) Preset upper safety limit (e.g., 1.7 MPa.a) ≥ P 20 ≥Preset safety lower limit (e.g., 1.0 MPa).

[0047] (5) All of the following normal operating conditions of O are met: 1) The 15.1 closing feedback signal has been triggered and the opening feedback signal has not been triggered; 2) The 16 opening feedback signal has been triggered and the closing feedback signal has not been triggered; 3) The 15 closing feedback signal has not been triggered and the valve position feedback is ≥ the preset lower limit value (e.g., 3%); 4) The opening feedback signals of the inlet / outlet shut-off valves of the heat network heaters and condensate coolers on the condensate side and the heat network user circulating water side within the preset number (e.g., 4 units) of O have been triggered and the closing feedback signals have not been triggered; 5) The interlock key of the outlet shut-off valve on the condensate side of each condensate cooler within O has been changed to the engaged position, and the interlock closing condition of each valve is that the corresponding liquid level H1 or H2 or H3 or H4 ≤ the preset low alarm value (e.g., normal liquid level -190mm), and the reset opening condition of each valve is that the corresponding liquid level H1 or H2 6) The open feedback signal of 53-1, 53-2, 57-3, and 57-4 has been triggered, but the close feedback signal has not been triggered; 7) The interlock open key of X-1 to X-4 has been changed to the engaged position, and the interlock open condition of each valve is that the corresponding liquid level H1 or H2 or H3 or H4 is ≥ the preset high alarm value (such as normal liquid level +220mm), and the reset close condition of each valve is that the corresponding liquid level H1 or H2 or H3 or H4 is ≤ the preset upper limit value (such as normal liquid level +100mm); 8) The preset safety upper limit value (such as normal liquid level +120mm) is ≥ H1 to H4 is ≥ the preset safety lower limit value (such as normal liquid level -110mm), and the preset high and low alarm switch signals of H1 to H4 have not been triggered; 9) T 13 ≤Preset safety upper limit (e.g., 290℃); 10)P 14 ≤Preset safety upper limit (e.g., 0.45 MPa.a); 11)Preset safety lower limit (e.g., 90℃) ≤T 15 ~T 18 ≤Preset safety upper limit (e.g., 110℃); 12)T 15 -T 19 T 16 -T 19 T 17 -T 19 T 18 -T 19 ≤Preset safety upper limit (e.g., 57℃); 13)T 15 ~T 18 The rate of temperature rise should be less than or equal to the preset safety upper limit (e.g., 0.3℃ / min).

[0048] (6) The following H A All normal operating conditions are met: 1) H A The preset number of units (e.g., ≥1 and ≤2) of the winter circulating cooling water pumps are already running, and the corresponding inlet / outlet shut-off valve open feedback signal has been triggered while the close feedback signal has not been triggered; 2) The automatic control key of the running winter circulating cooling water pump speed control device has been changed to the active position; 3) H A The standby pump interlock start button has been switched to the active position.

[0049] (7) The following H B All normal operating conditions are met: H B There are no pumps running inside, the interlock start key for the standby pumps has been switched to the active position, and the start sequence of each standby pump has been pre-selected.

[0050] (8) All of the following normal operating conditions are met: 1) The interlocking keys 60 and 61 have been switched to the engaged position, and the interlocking conditions are S2 ≥ preset value (e.g., 550 rpm) or M1 ≤ preset value (e.g., 15% rated load) or T 11 T 12 If either of these conditions is greater than or equal to the preset high alarm value (e.g., 65℃), the reset condition is either S2 < preset value (e.g., 550rpm) or M1 > preset value (e.g., 15% of rated load) or T. 11 T 12 1) H5 ≤ preset upper limit value (e.g., 60℃); 2) The interlock open key of 62 has been changed to the engaged position. The interlock open condition is H5 ≤ preset low 2 alarm value (e.g., 550mm), and the reset close condition is H5 ≥ preset lower limit value (e.g., 700mm); 3) The H5 automatic control key of 63 has been changed to the engaged position (the automatic tracking value can be referenced at 740mm); 4) The interlock open key of 64 has been changed to the engaged position. The interlock open condition is H5 ≥ preset high 2 alarm value (e.g., 1100mm), and the reset close condition is H5 ≤ preset upper limit value (e.g., 880mm); 5) The preset low 1 alarm value (e.g., 620mm) + preset safety offset value (e.g., 20mm) ≤ H5 ≤ preset high 1 alarm value (e.g., 940mm) - preset safety offset value (e.g., 20mm) and the preset high 1, 2 and low 1, 2 alarm switch signals of H5 are not triggered.

[0051] (9) All of the following normal operating conditions of J are met: 1) The preset number of condensate pumps in J (e.g., ≥0 and ≤2) are running, and the corresponding inlet / outlet shut-off valve open feedback signal has been triggered while the close feedback signal has not been triggered; 2) The automatic control key of the running condensate pump speed control device has been changed to the active position; 3) The standby pump interlock start key of J has been changed to the active position and the start sequence of each standby pump in J has been pre-selected; 4) The automatic control keys of 47 and 48 have been changed to the active position.

[0052] (10) All other auxiliary system operating conditions are met: 1) The standby pump interlock start key for each of the S, U, and V systems has been changed to the active position; 2) The interlock start sequence of each pump within T has been pre-selected, with the first pre-selected pump's interlock start condition being S2 ≤ preset upper limit (e.g., 1200 rpm), and the reset stop condition being S2 ≥ preset lower limit (e.g., 1000 rpm); 3) T 14 ≤Preset safety upper limit (e.g., 55℃); 4)Preset safety lower limit (e.g., 125℃)≤T 41 ≤Preset safety upper limit (e.g., 175℃); 5)P18 ≥ Preset safety lower limit (e.g., 0.45 MPa.a); 6) Preset safety lower limit (e.g., 0.12 MPa.a) ≤ P 21 ≤Preset safety upper limit (e.g., 0.14 MPa.a); 7)Preset safety lower limit (e.g., 0.12 MPa.a) ≤ P 22 ≤Preset safety upper limit (e.g., 0.15 MPa); 8)P 23 ≤Preset safety upper limit (e.g., 0.06 MPa.a); 9)Preset safety lower limit (e.g., 14.5 MPa.a) ≤ P 24 ≤Preset safety upper limit (e.g., 15.5 MPa.a); 10)Preset safety lower limit (e.g., 0.8 MPa.a)≤P 25 ≤Preset safety upper limit (e.g., 0.9 MPa.a).

[0053] (11) All normal operating conditions of the steam turbine body are met: 1) T5 ≤ preset safety upper limit (e.g., 430℃); 2) T6 ≤ preset safety upper limit (e.g., 290℃); 3) T7 ≤ preset safety upper limit (e.g., 430℃); 4) T8 ≤ preset safety upper limit (e.g., 280℃); 5) T9, T 10 ≤Preset safety upper limit (e.g., 160℃); 6)T 11 T 12 ≤Preset safety upper limit (e.g., 55℃); 7)T9~T 12 Temperature rise rate ≤ preset safety upper limit (e.g., 0.4℃ / min); 8)T 20 T 22 T 27 T 29 T 31 T 34 T 36 ≤Preset safety upper limit (e.g., 90℃); 9)T 21 T 23 T 26 T 28 T 30 T 32 T 35 T 37 T 40 ≤Preset safety upper limit (e.g., 70℃); 10)T 24 T 25 T 38 T 39 ≤Preset safety upper limit (e.g., 85℃); 11)T 3312) P2 Current heating condition constant sliding pressure automatic tracking value - preset bias value (e.g. 1.2MPa) ≤ P2 ≤ P2 Current heating condition constant sliding pressure automatic tracking value + preset bias value (e.g. 1.2MPa); 13) P4 Current heating condition constant sliding pressure automatic tracking value + preset bias value (e.g. 0.8MPa) ≤ P4 ≤ P4 Current heating condition constant sliding pressure automatic tracking value - preset bias value (e.g. 0.8MPa); 14) P5 ≤ preset safety upper limit value (e.g. 3.7MPa.a); 15) P6 ≤ preset safety upper limit value (e.g. 0.4MPa.a); 16) Preset low alarm value (calculated by substituting P7 into the preset B pressure ratio low alarm curve) + preset bias value (can be adjusted according to P) 7) Adjusted according to changes) ≤ B pressure ratio (P7 / P5) ≤ preset high alarm value (calculated by substituting P7 into the preset B pressure ratio high alarm curve) - preset bias value (can be adjusted according to changes in P7); 17) Preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve) + preset bias value (can be adjusted according to changes in P8) ≤ E pressure ratio (P8 / P9) ≤ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve) - preset bias value (can be adjusted according to changes in P8); 18) P8 ≥ preset safety lower limit value (e.g., 1.5MPa.a); 19) P9 ≤ preset safety upper limit value (e.g., 0.6MPa.a); 20) Under the conditions of combined back pressure and bypass heating or separate back pressure heating, P should meet the following requirements. 11 P 12 ≤Preset safety upper limit (e.g., 36 kPa·a), and should meet P under other heating conditions. 11 P 1221) F1+F2≤Preset safety upper limit (e.g., 380t / h); 22) F3+F4≤Preset safety upper limit (e.g., 480t / h); 23) F2-F4≤Preset safety upper limit (e.g., 50t / h); 24) F4-F2≤Preset safety upper limit (e.g., 170t / h); 25) S1≥S2-Preset safety offset (e.g., 50rpm); 26) The Y interlock start key has been changed to the engaged position. The interlock start condition is S2≤Preset value (initially 350rpm, adjustable later), and the reset stop condition is S2>Preset value (initially 350rpm, adjustable later); 27)Preset safety lower limit (e.g., -0.75mm). 27) Preset safety lower limit (e.g., -10mm) ≤ Z2 ≤ Preset safety upper limit (e.g., +6mm); 28) Preset safety lower limit (e.g., -0.1mm) ≤ Z3 ≤ Preset safety upper limit (e.g., +0.2mm); 29) Preset safety lower limit (e.g., -1mm) ≤ Z4 ≤ Preset safety upper limit (e.g., +13mm); 30) Preset safety lower limit (e.g., -0.7mm) ≤ Z5 ≤ Preset safety upper limit (e.g., +0.7mm); 31) When S2 ≤ 550rpm, then Z6 ≤ Preset safety upper limit (e.g., 60μm), otherwise this strip is cut off; 32) V1~V7 ≤ Preset safety upper limit (e.g., 80μm).

[0054] In one embodiment, locking control is performed on the first set of specified valve position increase / decrease operations according to a first set of preset conditions, including:

[0055] If any of the following conditions are met, then an operation to add a lockout control to the specified first valve position will be performed:

[0056] 0101) Boiler superheater steam pressure ≤ Boiler superheater steam pressure under heating conditions constant sliding pressure automatic tracking value - preset bias value;

[0057] 0102) High-pressure cylinder pressure ratio ≥ preset high alarm value;

[0058] 0103) Medium-pressure cylinder pressure ratio ≥ preset high alarm value;

[0059] If any of the following conditions are met, then an operation to add lockout control will be applied to the specified second valve position:

[0060] 0201) High-pressure cylinder pressure ratio ≤ preset low alarm value;

[0061] 0202) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value;

[0062] 0203) High-pressure heating bypass steam pressure to boiler superheater ≥ preset high alarm value;

[0063] 0204) The steam temperature of the high-pressure heating bypass to the boiler reheater is ≥ the preset high alarm value;

[0064] 0205) The sum of the desuperheating water flow rate of the high-pressure heating bypass and the steam flow rate of the high-pressure heating bypass is greater than or equal to the preset high alarm value;

[0065] 0206) The difference between the high-pressure heating bypass steam flow rate and the low-pressure heating bypass steam flow rate is greater than or equal to the preset high alarm value;

[0066] 0207) Boiler superheater steam pressure ≤ the difference between the current boiler superheater steam pressure under heating conditions constant sliding pressure automatic tracking value and the preset bias value;

[0067] 0208) Medium-pressure cylinder pressure ratio ≥ preset high alarm value;

[0068] If any of the following conditions are met, then an operation to add to the specified third valve position will be locked out:

[0069] 0301) High-pressure cylinder pressure ratio ≥ preset high alarm value;

[0070] 0302) Boiler reheater steam pressure ≤ the difference between the current boiler reheater steam pressure heating condition constant sliding pressure automatic tracking value and the preset bias value;

[0071] 0303) Medium-pressure cylinder pressure ratio ≥ preset high alarm value;

[0072] If any of the following conditions are met, then an operation will be added to the specified fourth valve position for interlocking control:

[0073] 0401) High-pressure cylinder pressure ratio ≥ preset high alarm value;

[0074] 0402) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value;

[0075] 0403) Medium-pressure cylinder pressure ratio ≤ preset low alarm value;

[0076] 0404) The temperature of the exhaust steam is greater than or equal to the preset high alarm value;

[0077] 0405) Steam pressure in the middle exhaust ≥ preset high alarm value;

[0078] 0406) The steam temperature of the low-pressure heating bypass to the heating network main pipe is greater than or equal to the preset high alarm value;

[0079] 0407) The steam pressure of the low-pressure heating bypass to the heating network main pipe is greater than or equal to the preset high alarm value;

[0080] 0408) The sum of the desuperheating water flow rate of the low-pressure heating bypass and the steam inlet flow rate of the low-pressure heating bypass is greater than or equal to the preset high alarm value;

[0081] 0409) The difference between the steam flow rate of the low-pressure heating bypass and the steam flow rate of the high-pressure heating bypass is greater than or equal to the preset high alarm value;

[0082] 0410) Boiler reheater steam pressure ≤ current boiler reheater steam pressure heating condition constant sliding pressure automatic tracking value and preset offset value;

[0083] If any of the following conditions are met, then an operation will be added to the specified fifth valve position for interlocking control:

[0084] 0501) The steam pressure at the low-pressure cylinder drops to a low alarm value that is preset to ensure the minimum flow rate of the low-pressure cylinder;

[0085] 0502) The feedback of the specified fifth valve position drops to the low alarm value that guarantees the minimum flow rate of the low-pressure cylinder;

[0086] 0503) The metal temperature of the last stage stator component of the low-pressure cylinder is greater than or equal to the preset high alarm value;

[0087] 0504) Low-pressure cylinder final stage steam temperature ≥ preset high alarm value;

[0088] 0505) The rate of temperature rise of either the metal temperature of the last stage stator component of the low-pressure cylinder or the steam temperature of the last stage of the low-pressure cylinder is greater than or equal to the preset high alarm value.

[0089] 0506) Medium-pressure cylinder pressure ratio ≥ preset high alarm value;

[0090] 0507) Any temperature at the outlet of the circulating water side of each branch of the heating network user within the heating network heater and condensate cooler system is greater than or equal to the preset high alarm value;

[0091] 0508) Any temperature ≥ preset high alarm value: outlet temperature of circulating water on the user side of each branch of the heating network heater and condensate cooler system and inlet temperature of circulating water on the user side of the heating network heater and condensate cooler system.

[0092] 0509) The rate of temperature rise at the outlet temperature of the circulating water side of each branch of the heating network user in the heating network heater and condensate cooler system is greater than or equal to the preset high alarm value.

[0093] If any of the following conditions are met, then an operation will be added to the specified sixth valve position for interlocking control:

[0094] 0601) Medium-pressure cylinder pressure ratio ≥ preset high alarm value;

[0095] 0602) When the unit is in back pressure heating mode and the signal has been triggered, the low-pressure cylinder rotor speed increase rate is greater than or equal to the preset high alarm value or the automatic tracking value of the low-pressure cylinder rotor speed is greater than or equal to the preset high alarm value.

[0096] In a specific embodiment, the triggering conditions for each heating condition are as follows:

[0097] 1. The signal indicating that the unit is in condensing extraction heating mode is triggered when all the following conditions are met, including: a) The original signal indicating that the unit is in condensing extraction heating mode has been triggered; b) The signal indicating that the unit is in backpressure heating mode has not been triggered. If any one of the above two conditions is not met, the signal indicating that the unit is in condensing extraction heating mode is reset and disappears.

[0098] 2. The signal indicating that the unit is in maximum condensing extraction heating mode is triggered when all the following conditions are met, including: a) The signal indicating that the unit is in condensing extraction heating mode has been triggered; b) P10 ≤ preset safety lower limit value (such as 0.16 MPa.a) or 18 valve position feedback ≤ preset safety lower limit value (such as 14%); c) The triggering conditions for 15 locked open and 18 locked closed have been met. If any one of the above three conditions is not met, the signal indicating that the unit is in maximum condensing extraction heating mode is reset and disappears.

[0099] 3. The signal indicating that the unit is in backpressure heating mode is triggered when all the following conditions are met, including: a) The original signal indicating that the unit is in condensing extraction heating mode has been triggered; b) The feedback signals for 17 and 18 being open have not been triggered; c) 18 valve position feedback ≤ preset upper limit value (such as 2%); d) The feedback signal for F being disengaged has been triggered and the feedback signal for meshing has not been triggered; e) The follow-up speed during the coast-down of the G rotor should satisfy the preset safety lower limit value (such as 100 rpm) ≤ S2 ≤ preset safety upper limit value (such as 550 rpm), or preset safety lower limit value (such as 550 rpm) < S2 ≤ preset safety upper limit value (such as 1200 rpm) and T9, T10 ≤ preset safety upper limit value (such as 160 °C) and T11, T12 ≤ preset safety upper limit value (such as 55 °C) and the temperature rise rate of T9 - T12 ≤ preset safety upper limit value (such as 0.4 °C / min). The signal indicating that the unit is in backpressure heating mode is reset and disappears when all the following conditions are met, including: a) The original signal indicating that the unit is in condensing extraction heating mode has not been triggered; b) The feedback signals for 17 and 18 being closed have not been triggered; c) 18 valve position feedback ≥ preset lower limit value (such as 9%); d) The feedback signal for F being meshed has been triggered and the feedback signal for disengagement has not been triggered; e) The determination of S1 = S2 is successful.

[0100] 4. The signal indicating that the unit is in bypass heating mode is triggered when all the following conditions are met, including: a) The original signal indicating that the unit is in condensing extraction heating mode has been triggered; b) The feedback signals for 10, 11, and 14 being closed have not been triggered; c) 11 valve position feedback ≥ preset lower limit value (such as 3%). The signal indicating that the unit is in bypass heating mode is reset and disappears when all the following conditions are met, including: a) The original signal indicating that the unit is in condensing extraction heating mode has not been triggered; b) The feedback signals for 10 and 11 being open have not been triggered; c) 11 valve position feedback ≤ preset upper limit value (such as 2%).

[0101] 5. The unit is triggered to operate under back pressure and bypass combined heating conditions if all of the following conditions are met: a) The unit is triggered to operate under back pressure heating conditions; b) The unit is triggered to operate under bypass heating conditions. If either of the above two conditions is not met, the unit is triggered to operate under back pressure and bypass combined heating conditions.

[0102] In one embodiment, locking control is performed on the first set of specified valve position increase / decrease operations according to a first set of preset conditions, including:

[0103] If any of the following conditions are met, then the specified first valve position reduction operation will be locked out:

[0104] 0701) High-pressure cylinder pressure ratio ≤ preset low alarm value;

[0105] 0702) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value;

[0106] 0703) High-pressure heating bypass steam pressure to boiler superheater ≥ preset high alarm value;

[0107] 0704) Boiler superheater steam pressure ≥ the sum of the current boiler superheater heating condition constant sliding pressure automatic tracking value and the preset bias value;

[0108] 0705) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value;

[0109] 0706) Medium-pressure cylinder pressure ratio ≤ preset low alarm value;

[0110] 0707) The temperature of the exhaust steam is greater than or equal to the preset high alarm value;

[0111] 0708) Steam pressure in the middle exhaust ≥ preset high alarm value;

[0112] If any of the following conditions are met, then the specified second valve position reduction operation will be locked out:

[0113] 0801) Boiler superheater steam pressure ≥ the sum of the current boiler superheater steam pressure under heating conditions, the automatic tracking value of constant sliding pressure, and the preset bias value;

[0114] 0802) High-pressure cylinder pressure ratio ≥ preset high alarm value;

[0115] 0803) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value;

[0116] 0804) Medium-pressure cylinder pressure ratio ≤ preset low alarm value;

[0117] 0805) The temperature of the exhaust steam is greater than or equal to the preset high alarm value;

[0118] 0806) Steam pressure in the middle exhaust ≥ preset high alarm value;

[0119] 0807) The difference between the steam flow rate of the low-pressure heating bypass and the steam flow rate of the high-pressure heating bypass is greater than or equal to the preset high alarm value;

[0120] If any of the following conditions are met, then the specified third valve position reduction operation will be locked out:

[0121] 0901) High-pressure cylinder pressure ratio ≤ preset low alarm value;

[0122] 0902) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value;

[0123] 0903) High-pressure heating bypass steam pressure to boiler superheater ≥ preset high alarm value;

[0124] 0904) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value;

[0125] 0905) Medium-pressure cylinder pressure ratio ≤ preset low alarm value;

[0126] 0906) The temperature of the exhaust steam is greater than or equal to the preset high alarm value;

[0127] 0907) Steam pressure in the middle exhaust ≥ preset high alarm value;

[0128] 0908) Boiler reheater steam pressure ≥ the sum of the current boiler reheater steam pressure under heating conditions, the automatic tracking value of constant sliding pressure, and the preset bias value;

[0129] If any of the following conditions are met, then the specified fourth valve position reduction operation will be locked out:

[0130] 1001) High-pressure cylinder pressure ratio ≤ preset low alarm value;

[0131] 1002) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value;

[0132] 1003) High-pressure heating bypass steam pressure to boiler superheater ≥ preset high alarm value;

[0133] 1004) The difference between the high-pressure heating bypass steam flow rate and the low-pressure heating bypass steam flow rate is greater than or equal to the preset high alarm value;

[0134] 1005) Boiler reheater steam pressure ≥ the sum of the current boiler reheater steam pressure under heating conditions, the automatic tracking value of constant sliding pressure, and the preset bias value;

[0135] 1006) Medium-pressure cylinder pressure ratio ≥ preset high alarm value;

[0136] If any of the following conditions are met, then the specified fifth valve position reduction operation will be locked out:

[0137] 1101) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value;

[0138] 1102) Medium-pressure cylinder pressure ratio ≤ preset low alarm value;

[0139] 1103) The temperature of the steam discharged from the middle outlet is greater than or equal to the preset high alarm value;

[0140] 1104) Steam pressure in the middle exhaust ≥ preset high alarm value;

[0141] If any of the following conditions are met, then the specified sixth valve position reduction operation will be locked out:

[0142] 1201) The low-pressure cylinder inlet pressure drops to a low alarm value that is preset to ensure the minimum flow rate of the low-pressure cylinder;

[0143] 1202) The feedback of the specified sixth valve position drops to the low alarm value that guarantees the minimum flow rate of the low-pressure cylinder;

[0144] 1203) The metal temperature of the last stage stator component of the low-pressure cylinder is greater than or equal to the preset high alarm value;

[0145] 1204) Low-pressure cylinder final stage steam temperature ≥ preset high alarm value;

[0146] 1205) The temperature rise rate of either the metal temperature of the last stage stator component of the low-pressure cylinder or the steam temperature of the last stage of the low-pressure cylinder is greater than or equal to the preset high alarm value.

[0147] 1206) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value;

[0148] 1207) Medium-pressure cylinder pressure ratio ≤ preset low alarm;

[0149] 1208) The temperature of the exhaust steam is greater than or equal to the preset high alarm value;

[0150] 1209) Steam pressure in the middle exhaust ≥ preset high alarm value;

[0151] 1210) When the unit is in back pressure heating mode and the signal has been triggered, the difference between the automatic tracking value of the low pressure cylinder rotor speed and the low pressure cylinder rotor speed is greater than or equal to the preset high alarm value.

[0152] In a specific embodiment, the conditions for adding or removing the interlocking control of 2) main steam regulating valve, 4) high-pressure heating bypass steam regulating valve, 9) reheat steam regulating valve, 11) low-pressure heating bypass steam regulating valve, 15) intermediate discharge heating extraction steam regulating valve, and 18) intermediate discharge inlet G steam regulating valve (hereinafter referred to as valve positions 2, 4, 9, 11, 15, and 18) are explained:

[0153] (1)2 Valve position lockout control conditions: 1) P2≤P2 current heating condition constant sliding pressure automatic tracking value - preset offset value (e.g. 1.5MPa); 2) B pressure ratio (P7 / P5)≥ preset high alarm value (calculated by substituting P7 into the preset B pressure ratio high alarm curve); 3) E pressure ratio (P8 / P9)≥ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve).

[0154] When the unit is in bypass heating mode, the signal has been triggered. If any of the above conditions are met, valve position 2 will be locked, operation will be increased, and the corresponding audible and visual alarm will be triggered.

[0155] (2) Valve position lockout reduction control conditions: 1) B pressure ratio (P7 / P5) ≤ preset low alarm value (calculated by substituting P7 into the preset B pressure ratio low alarm curve); 2) T7 ≥ preset high alarm value (e.g. 440℃); 3) P5 ≥ preset high alarm value (e.g. 3.9MPa.a); 4) P2 ≥ P2 current heating condition constant sliding pressure automatic tracking value + preset offset value (e.g. 1.5MPa); 5) P8 ≤ preset low alarm value (e.g. 1.3MPa.a); 6) E pressure ratio (P8 / P9) ≤ preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve); 7) T8 ≥ preset high alarm value (e.g. 290℃); 8) P9 ≥ preset high alarm value (e.g. 0.7MPa.a).

[0156] When the unit is in bypass heating mode and the signal has been triggered, if any of the above conditions are met, valve position 2 will be locked to reduce operation and trigger the corresponding audible and visual alarm.

[0157] (3) 4 Valve position lockout control conditions: 1) B pressure ratio (P7 / P5) ≤ preset low alarm value (calculated by substituting P7 into the preset B pressure ratio low alarm curve); 2) T7 ≥ preset high alarm value (e.g. 440℃); 3) P5 ≥ preset high alarm value (e.g. 3.9MPa.a); 4) T5 ≥ preset high alarm value (e.g. 440℃); 5) F1+F2 ≥ preset high alarm value (e.g. 400t / h); 6) F2-F4 ≥ preset high alarm value (e.g. 55t / h); 7) P2 ≤ P2 current heating condition constant sliding pressure automatic tracking value - preset offset value (e.g. 1.5MPa); 8) E pressure ratio (P8 / P9) ≥ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve).

[0158] When the unit is in bypass heating mode and the signal has been triggered, if any of the above conditions are met, valve position 4 will be locked, operation will be increased, and the corresponding audible and visual alarms will be triggered.

[0159] (4) 4-valve position lock-up reduction control conditions: 1) P2≥P2 current heating condition constant sliding pressure automatic tracking value + preset offset value (e.g. 1.5MPa); 2) B pressure ratio (P7 / P5)≥ preset high alarm value (calculated by substituting P7 into the preset B pressure ratio high alarm curve); 3) P8≤ preset low alarm value (e.g. 1.3MPa.a); 4) E pressure ratio (P8 / P9)≤ preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve); 5) T8≥ preset high alarm value (e.g. 290℃); 6) P9≥ preset high alarm value (e.g. 0.7MPa.a); 7) F4-F2≥ preset high alarm value (e.g. 185t / h).

[0160] When the unit is in bypass heating mode and the signal has been triggered, if any of the above conditions are met, valve position 4 will be locked to reduce operation and trigger the corresponding audible and visual alarm.

[0161] (5) 9 Valve position lockout control conditions: 1) B pressure ratio (P7 / P5) ≥ preset high alarm value (calculated by substituting P7 into the preset B pressure ratio high alarm curve); 2) P4 ≤ P4 current heating condition constant sliding pressure automatic tracking value - preset offset value (e.g. 1MPa); 3) E pressure ratio (P8 / P9) ≥ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve).

[0162] When the unit is in bypass heating mode and the signal has been triggered, if any of the above conditions are met, valve position 9 will be locked, operation will be increased, and the corresponding audible and visual alarm will be triggered.

[0163] (6) 9 Valve position lockout reduction control conditions: 1) B pressure ratio (P7 / P5) ≤ preset low alarm value (calculated by substituting P7 into the preset B pressure ratio low alarm curve); 2) T7 ≥ preset high alarm value (e.g. 440℃); 3) P5 ≥ preset high alarm value (e.g. 3.9MPa.a); 4) P8 ≤ preset low alarm value (e.g. 1.3MPa.a); 5) E pressure ratio (P8 / P9) ≤ preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve); 6) T8 ≥ preset high alarm value (e.g. 290℃); 7) P9 ≥ preset high alarm value (e.g. 0.7MPa.a); 8) P4 ≥ P4 current heating condition constant sliding pressure automatic tracking value + preset offset value (e.g. 1MPa).

[0164] When the unit is in bypass heating mode and the signal has been triggered, if any of the above conditions are met, valve position 9 will be locked to reduce operation and trigger the corresponding audible and visual alarm.

[0165] (7) Valve position lockout control conditions: 1) B pressure ratio (P7 / P5) ≥ preset high alarm value (calculated by substituting P7 into the preset B pressure ratio high alarm curve); 2) P8 ≤ preset low alarm value (e.g., 1.3 MPa); 3) E pressure ratio (P8 / P9) ≤ preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve); 4) T8 ≥ preset high alarm value (e.g., 290℃); 5) P9 ≥ 6) T6 ≥ preset high alarm value (e.g., 0.7 MPa.a); 7) P6 ≥ preset high alarm value (e.g., 300℃); 8) F3 + F4 ≥ preset high alarm value (e.g., 500 t / h); 9) F4 - F2 ≥ preset high alarm value (e.g., 185 t / h); 10) P4 ≤ P4 current heating condition constant sliding pressure automatic tracking value - preset offset value (e.g., 1 MPa).

[0166] When the unit is in bypass heating mode, the signal has been triggered. If any of the above conditions are met, valve position 11 will be locked, operation will be increased, and the corresponding audible and visual alarm will be triggered.

[0167] (8) 11 Valve position lockout reduction control conditions: 1) B pressure ratio (P7 / P5) ≤ preset low alarm value (calculated by substituting P7 into the preset B pressure ratio low alarm curve); 2) T7 ≥ preset high alarm value (e.g. 440℃); 3) P5 ≥ preset high alarm value (e.g. 3.9MPa.a); 4) F2-F4 ≥ preset high alarm value (e.g. 55t / h); 5) P4 ≥ P4 current heating condition constant sliding pressure automatic tracking value + preset offset value (e.g. 1MPa); 6) E pressure ratio (P8 / P9) ≥ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve).

[0168] When the unit is in bypass heating mode and the signal has been triggered, if any of the above conditions are met, valve position 11 will be locked to reduce operation and trigger the corresponding audible and visual alarm.

[0169] (9) 15 Valve position lockout control conditions: 1) P 10 1) Reduce the pressure to a preset low alarm value (e.g., 0.13 MPa) to ensure minimum flow rate of the low-pressure cylinder; 2) Reduce the pressure at valve position 18 to a preset low alarm value (e.g., 9%) to ensure minimum flow rate of the low-pressure cylinder; 3) T9, T 10 Either of the two is greater than or equal to the preset high alarm value (e.g., 180℃); 4) T 11 T 12 Either of these two values ​​is greater than or equal to the preset high alarm value (e.g., 60℃); 5) T9~T 12 6) Any of the four temperature rise rates ≥ preset high alarm value (e.g., 0.5℃ / min); 7) E pressure ratio (P8 / P9) ≥ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve); 8) T 15 ~T 18Any one of the four values ​​is greater than or equal to the preset high alarm value (e.g., 120℃); 8)T 15 -T 19 T 16 -T 19 T 17 -T 19 T 18 -T 19 Any one of the four values ​​is greater than or equal to the preset high alarm value (e.g., 60℃); 9)T 15 ~T 18 The rate of temperature rise of any one of the four components is greater than or equal to the preset high alarm value (e.g., 0.4℃ / min).

[0170] If any of the above conditions are met, the operation of valve position 15 will be increased and the corresponding audible and visual alarm will be triggered. If either of the following two situations occurs, conditions 1) to 5) above will be automatically deactivated, including: 1) The unit is in the maximum extraction steam heating condition signal and the F unlock feedback signal have been triggered but the F lock feedback signal has not been triggered; 2) The unit is in the back pressure heating condition signal has been triggered.

[0171] (10) 15 Valve position lockout reduction control conditions: 1) P8 ≤ preset low alarm value (e.g. 1.3MPa.a); 2) E pressure ratio (P8 / P9) ≤ preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve); 3) T8 ≥ preset high alarm value (e.g. 290℃); 4) P9 ≥ preset high alarm value (e.g. 0.7MPa.a).

[0172] If any of the above conditions are met, valve position 15 will be locked to reduce operation and trigger the corresponding audible and visual alarm.

[0173] (11) 18 Valve Position Lockout Control Conditions: 1) E pressure ratio (P8 / P9) ≥ preset high alarm value (calculated by substituting P8 into the preset E pressure ratio high alarm curve); 2) When the "unit is in back pressure heating mode" signal has been triggered, the S2 ramp rate ≥ preset high alarm value (e.g., 550 rpm). 2 Or the S2-S2 automatic tracking value is greater than or equal to the preset high alarm value (e.g., 250 rpm).

[0174] If any of the above conditions are met, the operation of valve position 18 will be increased and a corresponding audible and visual alarm will be triggered.

[0175] (12) 18 Valve position lockout control conditions: 1) P 10 1) Reduce the pressure to a preset low alarm value (e.g., 0.13 MPa) to ensure minimum flow rate of the low-pressure cylinder; 2) Reduce the pressure at valve position 18 to a preset low alarm value (e.g., 9%) to ensure minimum flow rate of the low-pressure cylinder; 3) T9, T 10 Either of the two is greater than or equal to the preset high alarm value (e.g., 180℃); 4) T 11 T 12Either of these two values ​​is greater than or equal to the preset high alarm value (e.g., 60℃); 5) T9~T 12 6) Any of the four temperature rise rates ≥ preset high alarm value (e.g., 0.5℃ / min); 7) P8 ≤ preset low alarm value (e.g., 1.3MPa.a); 8) E pressure ratio (P8 / P9) ≤ preset low alarm value (calculated by substituting P8 into the preset E pressure ratio low alarm curve); 9) T8 ≥ preset high alarm value (e.g., 290℃); 10) P9 ≥ preset high alarm value (e.g., 0.7MPa.a); 11) When the unit is in back pressure heating mode and the signal has been triggered, the S2 automatic tracking value -S2 ≥ 250rpm.

[0176] If any of the above conditions are met, the operation of valve position 18 will be reduced and the corresponding audible and visual alarm will be triggered. If either of the following two situations occurs, conditions 1) to 5) above will be automatically deactivated, including: 1) The unit is in the maximum extraction steam heating condition signal and the F unlock feedback signal have been triggered but the F lock feedback signal has not been triggered; 2) The unit is in the back pressure heating condition signal has been triggered.

[0177] In one embodiment, automatically cutting off the second set of specified valve position increase / decrease operations according to the second set of preset conditions includes:

[0178] If any of the following conditions are met, items 0501) to 0505) of the interlock control conditions for adding operation to the fifth valve position will be automatically deactivated:

[0179] 1301) The unit is in maximum extraction steam heating condition signal and SSS clutch unlock feedback signal have both been triggered, while SSS clutch lock feedback signal has not been triggered.

[0180] 1302) The signal that the unit is in back pressure heating mode has been triggered.

[0181] In one embodiment, automatically cutting off the second set of specified valve position increase / decrease operations according to the second set of preset conditions includes:

[0182] If any of the following conditions are met, then conditions 1201) to 1205) of the lockout control conditions for the sixth valve position reduction operation will be automatically deactivated:

[0183] 1401) The unit is in maximum extraction steam heating condition signal and SSS clutch unlock feedback signal have both been triggered, while SSS clutch lock feedback signal has not been triggered.

[0184] 1402) The signal that the unit is in back pressure heating mode has been triggered.

[0185] In step 102, the unit low alarm is triggered according to the third set of preset conditions, and the unit low interlock trip is triggered according to the fourth set of preset conditions.

[0186] In one embodiment, when the third set of preset conditions is satisfied, a low alarm of the unit is triggered, including:

[0187] When the signal of the unit being in the back-pressure heating operation mode has been triggered, if the preset low trip value < the rotational speed of the low-pressure cylinder rotor < the preset low alarm value, a low alarm for the rotational speed of the low-pressure cylinder rotor of the unit is triggered.

[0188] In one embodiment, when the fourth set of preset conditions is satisfied, a low interlock trip of the unit is triggered, including:

[0189] When the signal of the unit being in the back-pressure heating operation mode has been triggered, if the rotational speed of the low-pressure cylinder rotor ≤ the preset low trip value, a low interlock trip for the rotational speed of the low-pressure cylinder rotor of the unit is triggered.

[0190] In a specific embodiment, when the signal of the unit being in the back-pressure heating operation mode has been triggered, if the preset low trip value (such as 60 rpm) < S2 < the preset low alarm value (100 rpm), a low alarm for S2 of the unit is triggered; if S2 ≤ 60 rpm, a low interlock trip for S2 of the unit is triggered.

[0191] In step 103, corresponding interlock control is performed on the third set of designated valve positions according to the fifth set of preset conditions, and according to the interlock control operation, it is prompted to the operator whether to restore the valve positions that have been automatically cut off, and corresponding interlock control is performed on the third set of designated valve positions according to the sixth set of preset conditions.

[0192] In one embodiment, performing corresponding interlock control on the third set of designated valve positions according to the fifth set of preset conditions includes:

[0193] When the signals of the unit being in the maximum extraction heating operation mode, the close feedback signals of the steam shut-off valve and the steam regulating valve for the middle exhaust entering the low-pressure cylinder have all been triggered, and the open feedback signal has not been triggered, if any of the following conditions is satisfied, the steam shut-off valve for the middle exhaust entering the low-pressure cylinder is interlocked to be fully opened, and the steam regulating valve for the middle exhaust entering the low-pressure cylinder is opened to the preset value:

[0194] 1501) The rotational speed of the low-pressure cylinder rotor ≥ the preset value after a preset time value at the start of the coast-down process;

[0195] 1502) The preset safety lower limit value < the rotational speed of the low-pressure cylinder rotor ≤ the preset safety upper limit value, and the steam temperature at the last stage of the low-pressure cylinder > the preset safety upper limit value, or the steam temperature at the last stage of the low-pressure cylinder > the preset safety upper limit value, or the temperature rise rate of any one of the metal temperature of the stator components at the last stage of the low-pressure cylinder and the steam temperature at the last stage of the low-pressure cylinder > the preset safety upper limit value;

[0196] 1503) The rotational speed of the low-pressure cylinder rotor > the preset safety upper limit value after a preset time at the start of the coast-down process.

[0197] In one embodiment, performing corresponding interlock control on the third set of designated valve positions according to the sixth set of preset conditions includes:

[0198] When the signals of the back-pressure heating operation mode of the unit and the feedback signal of the opening of the steam shut-off valve for the intermediate extraction to the low-pressure cylinder are both triggered, and the feedback signal of the closing is not triggered, and the automatic control key of the low-pressure cylinder rotor speed of the steam regulating valve for the intermediate extraction to the low-pressure cylinder has become the enabled position, if any of the following conditions is satisfied, then interlock and fully close the steam shut-off valve for the intermediate extraction to the low-pressure cylinder and the steam regulating valve for the intermediate extraction to the low-pressure cylinder:

[0199] 1601) When the low-pressure cylinder rotor speed after a preset time from the start of the speed-up process ≤ the preset value;

[0200] 1602) The relevant safety parameters of each device ≥ the preset high trip value or │low-pressure cylinder rotor speed - low-pressure cylinder rotor speed automatic tracking value│≥ the preset high trip value for a duration ≥ the preset time from the start of the speed-up process or the low-pressure cylinder rotor speed acceleration rate ≥ the preset high trip value for a duration ≥ the preset time from the start of the speed-up process.

[0201] In a specific embodiment, interlock control of the valve positions of 17 and 18 is performed according to different conditions:

[0202] (1) When the signal of the maximum extraction heating operation mode of the unit is triggered, and at the same time the feedback signals of the closing of 17 and 18 are triggered and the feedback signal of the opening is not triggered, if any of the following conditions is satisfied, including: 1) S2≥ the preset value (such as 2900 rpm) after a preset time value (such as 1 min) from the start of the coast-down process; 2) When the preset safety lower limit value (such as 550 rpm) < S2 ≤ the preset safety upper limit value (such as 1200 rpm), and either of T9 and T 10 either > the preset safety upper limit value (such as 160 °C) or T 11 、T 12 either > the preset safety upper limit value (such as 55 °C) or the temperature rise rate of any one of T9 to T 12 any one of the four > the preset safety upper limit value (such as 0.4 °C / min); 3) S2 > 1200 rpm after a preset time (such as 60 min) from the start of the coast-down process, then interlock and fully open 17 and feedback interlock the valve position of 18 to the preset value (such as 9%), and at the same time remind the operator whether to lock F and restore the cut-off 15 and 18 locking control modes.

[0203] (2) When the signal of the back-pressure heating operation mode of the unit is triggered, and at the same time the feedback signal of the opening of 17 is triggered and the feedback signal of the closing is not triggered, and the S2 automatic control key of 18 has become the enabled position, if any of the following conditions is satisfied, including: 1) When S2 ≤ the preset value (such as follow-up speed + preset offset value such as 50 rpm) 1 min after the start of the speed-up process; 2) The relevant safety parameters of devices such as F and G (including but not limited to T 33 ~T 40The duration of the S2 automatic tracking value (e.g., S2-S2) ≥ preset high trip value (e.g., 300 rpm) is ≥ 1 min, or the S2 ramp rate is ≥ preset high trip value (e.g., 600 rpm). 2 If the duration of the interlock is ≥1 minute, then the interlock is fully closed (17, 18).

[0204] In one embodiment, the first set of designated valve positions includes: a main steam regulating valve, a high-pressure heating bypass steam regulating valve, a reheat steam regulating valve, a low-pressure heating bypass steam regulating valve, a mid-exhaust heating extraction steam regulating valve, and a mid-exhaust low-pressure cylinder steam regulating valve; the second set of designated valve positions includes: a mid-exhaust heating extraction steam regulating valve and a mid-exhaust low-pressure cylinder steam regulating valve; and the third set of designated valve positions includes: a mid-exhaust low-pressure cylinder steam shut-off valve and a mid-exhaust low-pressure cylinder steam regulating valve.

[0205] This invention is based on a 300MW cogeneration unit with a turbine back pressure and bypass combined heating system equipped with an SSS clutch. Details of the equipment and physical quantities corresponding to the serial numbers used in the following logic block diagrams are provided below. Figure 3 — Figure 7 In the diagram, "And" represents the "logical AND" operation, "Or" represents the "logical OR" operation, and "N" represents the "logical NOT" operation. Operating condition 1 represents "the unit is in the extraction steam heating condition", operating condition 2 represents "the unit is in the maximum extraction steam heating condition", operating condition 3 represents "the unit is in the back pressure heating condition", operating condition 4 represents "the unit is in the bypass heating condition", and operating condition 5 represents "the unit is in the combined back pressure and bypass heating condition".

[0206] Figure 3 This is a schematic diagram of the 2-valve-position and 4-valve-position interlocking control modes, which are used for interlocking control of the 2-valve-position (main steam regulating valve) and the 4-valve-position (high-pressure heating bypass steam regulating valve).

[0207] Figure 4 This is a schematic diagram of the 9 and 11 valve position interlocking control modes, which are used for interlocking control of valve position 9 (reheat steam regulating valve) and valve position 11 (low-pressure heating bypass steam regulating valve).

[0208] Figure 5 This is a schematic diagram of the 15 and 18 valve position interlocking control modes, which are used for interlocking control of valve position 15 (middle exhaust heating steam extraction regulating valve) and valve position 18 (middle exhaust low pressure cylinder steam regulating valve);

[0209] Figure 6 This is a schematic diagram of the unit's S2 low alarm and interlocking trip control mode, which triggers the unit's S2 low interlocking trip.

[0210] Figure 7This is a schematic diagram of the interlocking control mode for valve positions 17 and 18, which implements interlocking control for valve position 17 (steam shut-off valve for middle discharge into low-pressure cylinder) and valve position 18 (steam regulating valve for middle discharge into low-pressure cylinder).

[0211] This invention also provides a back pressure and bypass heating safety protection control device, as described in the following embodiments. Since the principle by which this device solves the problem is similar to the back pressure and bypass heating safety protection control method, its implementation can be referred to the implementation of the back pressure and bypass heating safety protection control method, and repeated details will not be elaborated further. This device is used to execute the aforementioned back pressure and bypass heating safety protection control method.

[0212] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned back pressure and bypass heating safety protection control method.

[0213] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned back pressure and bypass heating safety protection control method.

[0214] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the aforementioned back pressure and bypass heating safety protection control method.

[0215] In this embodiment of the invention, the addition and subtraction operations of a first group of designated valve positions are interlocked according to a first set of preset conditions, triggering corresponding audible and visual alarms. The addition and subtraction operations of a second group of designated valve positions are automatically cut off according to a second set of preset conditions. A low-level alarm is triggered based on a third set of preset conditions, and a low-level interlock trip is triggered based on a fourth set of preset conditions. Interlock control is applied to the designated valve positions of a third group according to a fifth set of preset conditions, and the operator is prompted whether to restore the valve positions that have undergone automatic cut-off. Interlock control is also applied to the designated valve positions of a third group according to a sixth set of preset conditions. In the above process, this embodiment of the invention performs corresponding valve position addition and subtraction operations and interlock control based on multiple sets of preset conditions, thereby reducing the impact of switching between various heating conditions on the unit and the heating network, and enhancing the safety and reliability of the back pressure and bypass combined heating system.

[0216] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0217] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0218] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0219] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0220] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for back pressure and bypass heating safety protection and control, characterized in that, include: According to the first set of preset conditions, the first set of specified valve position increase / decrease operations are locked and controlled, and the corresponding audible and visual alarms are triggered. According to the second set of preset conditions, the second set of specified valve position increase / decrease operations are automatically cut off. According to the third set of preset conditions, the unit's low alarm is triggered; according to the fourth set of preset conditions, the unit's low interlock trip is triggered. According to the fifth set of preset conditions, the corresponding interlock control is performed on the designated valve position of the third group. According to the interlock control operation, the operator is prompted whether to restore the valve position that has been automatically cut off. According to the sixth set of preset conditions, the corresponding interlock control is performed on the designated valve position of the third group. The first set of designated valve positions includes: main steam regulating valve, high-pressure heating bypass steam regulating valve, reheat steam regulating valve, low-pressure heating bypass steam regulating valve, intermediate exhaust heating extraction steam regulating valve, and intermediate exhaust inlet low-pressure cylinder steam regulating valve; the second set of designated valve positions includes: intermediate exhaust heating extraction steam regulating valve and intermediate exhaust inlet low-pressure cylinder steam regulating valve; the third set of designated valve positions includes: intermediate exhaust inlet low-pressure cylinder steam shut-off valve and intermediate exhaust inlet low-pressure cylinder steam regulating valve. Based on the first set of preset conditions, the first set of specified valve position increase / decrease operations are interlocked, including: If any of the following conditions are met, then an operation to add a lockout control to the specified first valve position will be performed: 0101) Boiler superheater steam pressure ≤ Boiler superheater steam pressure under heating conditions constant sliding pressure automatic tracking value - preset bias value; 0102) High-pressure cylinder pressure ratio ≥ preset high alarm value; 0103) Medium-pressure cylinder pressure ratio ≥ preset high alarm value; If any of the following conditions are met, then an operation to add lockout control will be applied to the specified second valve position: 0201) High-pressure cylinder pressure ratio ≤ preset low alarm value; 0202) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value; 0203) The steam pressure from the high-pressure heating bypass to the boiler superheater is greater than or equal to the preset high alarm value; 0204) The steam temperature of the high-pressure heating bypass to the boiler reheater is ≥ the preset high alarm value; 0205) The sum of the desuperheating water flow rate of the high-pressure heating bypass and the steam inlet flow rate of the high-pressure heating bypass is greater than or equal to the preset high alarm value; 0206) The difference between the high-pressure heating bypass steam flow rate and the low-pressure heating bypass steam flow rate is greater than or equal to the preset high alarm value; 0207) Boiler superheater steam pressure ≤ the difference between the current boiler superheater steam pressure under heating conditions and the preset bias value; 0208) Medium-pressure cylinder pressure ratio ≥ preset high alarm value; If any of the following conditions are met, then an operation to add to the specified third valve position will be locked out: 0301) High-pressure cylinder pressure ratio ≥ preset high alarm value; 0302) Boiler reheater steam pressure ≤ the difference between the current boiler reheater steam pressure under heating conditions and the preset offset value; 0303) Medium-pressure cylinder pressure ratio ≥ preset high alarm value; If any of the following conditions are met, then an operation will be added to the specified fourth valve position for interlocking control: 0401) High-pressure cylinder pressure ratio ≥ preset high alarm value; 0402) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value; 0403) Medium-pressure cylinder pressure ratio ≤ preset low alarm value; 0404) The temperature of the exhaust steam is greater than or equal to the preset high alarm value; 0405) Steam pressure in the middle exhaust ≥ preset high alarm value; 0406) The steam temperature of the low-pressure heating bypass to the heating network main pipe is greater than or equal to the preset high alarm value; 0407) The steam pressure of the low-pressure heating bypass to the heating network main pipe is greater than or equal to the preset high alarm value; 0408) The sum of the desuperheating water flow rate of the low-pressure heating bypass and the steam inlet flow rate of the low-pressure heating bypass is greater than or equal to the preset high alarm value; 0409) The difference between the steam flow rate of the low-pressure heating bypass and the steam flow rate of the high-pressure heating bypass is greater than or equal to the preset high alarm value; 0410) Boiler reheater steam pressure ≤ current boiler reheater steam pressure heating condition constant sliding pressure automatic tracking value and preset offset value; If any of the following conditions are met, then an operation will be added to the specified fifth valve position for interlocking control: 0501) The steam pressure at the low-pressure cylinder drops to a low alarm value that is preset to ensure the minimum flow rate of the low-pressure cylinder; 0502) The feedback from the specified fifth valve position drops to a low alarm value that guarantees the minimum flow rate of the low-pressure cylinder; 0503) The metal temperature of the last stage stator component of the low-pressure cylinder is greater than or equal to the preset high alarm value; 0504) Low-pressure cylinder final stage steam temperature ≥ preset high alarm value; 0505) The rate of temperature rise of either the metal temperature of the last stage stator component of the low-pressure cylinder or the steam temperature of the last stage of the low-pressure cylinder is greater than or equal to the preset high alarm value; 0506) Medium-pressure cylinder pressure ratio ≥ preset high alarm value; 0507) Any temperature at the outlet of the circulating water side of each branch of the heating network user in the heating network heater and condensate cooler system is greater than or equal to the preset high alarm value; 0508) Any temperature of the outlet temperature of the circulating water side of each branch of the heating network user in the heating network heater and condensate cooler system and the inlet temperature of the circulating water side of the heating network user in the heating network heater and condensate cooler system is greater than or equal to the preset high alarm value. 0509) The rate of temperature rise at the outlet temperature of the circulating water side of each branch of the heating network user in the heating network heater and condensate cooler system is greater than or equal to the preset high alarm value. If any of the following conditions are met, then an operation will be added to the specified sixth valve position for interlocking control: 0601) Medium-pressure cylinder pressure ratio ≥ preset high alarm value; 0602) When the unit is in back pressure heating mode and the signal has been triggered, the low-pressure cylinder rotor speed increase rate is greater than or equal to the preset high alarm value or the automatic tracking value between the low-pressure cylinder rotor speed and the low-pressure cylinder rotor speed is greater than or equal to the preset high alarm value. Based on the first set of preset conditions, the first set of specified valve position increase / decrease operations are interlocked, including: If any of the following conditions are met, then the specified first valve position reduction operation will be locked out: 0701) High-pressure cylinder pressure ratio ≤ preset low alarm value; 0702) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value; 0703) High-pressure heating bypass steam pressure to boiler superheater ≥ preset high alarm value; 0704) Boiler superheater steam pressure ≥ the sum of the current boiler superheater heating condition constant sliding pressure automatic tracking value and the preset bias value; 0705) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value; 0706) Medium-pressure cylinder pressure ratio ≤ preset low alarm value; 0707) The temperature of the exhaust steam is greater than or equal to the preset high alarm value; 0708) Steam pressure in the middle exhaust ≥ preset high alarm value; If any of the following conditions are met, then the specified second valve position reduction operation will be locked out: 0801) Boiler superheater steam pressure ≥ the sum of the current boiler superheater steam pressure under heating conditions, the automatic tracking value of constant sliding pressure, and the preset bias value; 0802) High-pressure cylinder pressure ratio ≥ preset high alarm value; 0803) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value; 0804) Medium-pressure cylinder pressure ratio ≤ preset low alarm value; 0805) The temperature of the exhaust steam is greater than or equal to the preset high alarm value; 0806) Steam pressure in the middle exhaust ≥ preset high alarm value; 0807) The difference between the steam flow rate of the low-pressure heating bypass and the steam flow rate of the high-pressure heating bypass is greater than or equal to the preset high alarm value; If any of the following conditions are met, then the specified third valve position reduction operation will be locked out: 0901) High-pressure cylinder pressure ratio ≤ preset low alarm value; 0902) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value; 0903) High-pressure heating bypass steam pressure to boiler superheater ≥ preset high alarm value; 0904) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value; 0905) Medium-pressure cylinder pressure ratio ≤ preset low alarm value; 0906) The temperature of the exhaust steam is greater than or equal to the preset high alarm value; 0907) Steam pressure in the middle exhaust ≥ preset high alarm value; 0908) Boiler reheater steam pressure ≥ the sum of the current boiler reheater steam pressure under heating conditions, the automatic tracking value of constant sliding pressure, and the preset bias value; If any of the following conditions are met, then the specified fourth valve position reduction operation will be locked out: 1001) High-pressure cylinder pressure ratio ≤ preset low alarm value; 1002) High exhaust steam temperature at the boiler superheater ≥ preset high alarm value; 1003) The steam pressure from the high-pressure heating bypass to the boiler superheater is greater than or equal to the preset high alarm value; 1004) The difference between the high-pressure heating bypass steam flow rate and the low-pressure heating bypass steam flow rate is greater than or equal to the preset high alarm value; 1005) Boiler reheater steam pressure ≥ the sum of the current boiler reheater steam pressure under heating conditions, the automatic tracking value of constant sliding pressure, and the preset bias value; 1006) Medium-pressure cylinder pressure ratio ≥ preset high alarm value; If any of the following conditions are met, then the specified fifth valve position reduction operation will be locked out: 1101) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value; 1102) Medium-pressure cylinder pressure ratio ≤ preset low alarm value; 1103) The temperature of the steam discharged from the middle outlet is greater than or equal to the preset high alarm value; 1104) Steam pressure in the middle exhaust ≥ preset high alarm value; If any of the following conditions are met, then the specified sixth valve position reduction operation will be locked out: 1201) The steam pressure at the low-pressure cylinder drops to a low alarm value that is preset to ensure the minimum flow rate of the low-pressure cylinder; 1202) The feedback of the specified sixth valve position drops to the low alarm value that guarantees the minimum flow rate of the low-pressure cylinder; 1203) The metal temperature of the last stage stator component of the low-pressure cylinder is greater than or equal to the preset high alarm value; 1204) Low-pressure cylinder final stage steam temperature ≥ preset high alarm value; 1205) The rate of temperature rise of either the metal temperature of the last stage stator component of the low-pressure cylinder or the steam temperature of the last stage of the low-pressure cylinder is greater than or equal to the preset high alarm value; 1206) The steam inlet pressure of the intermediate pressure cylinder is less than or equal to the preset low alarm value; 1207) Medium-pressure cylinder pressure ratio ≤ preset low alarm; 1208) The temperature of the exhaust steam is greater than or equal to the preset high alarm value; 1209) Steam pressure in the middle exhaust ≥ preset high alarm value; 1210) When the unit is in back pressure heating mode and the signal has been triggered, the difference between the automatic tracking value of the low pressure cylinder rotor speed and the low pressure cylinder rotor speed is greater than or equal to the preset high alarm value.

2. The method as described in claim 1, characterized in that, Before performing interlock control on the first set of specified valve position increase / decrease operations based on the first set of preset conditions, the following is also included: When all execution conditions are met, the operation execution state is initiated, and the operation process is executed. If any of the execution conditions are not met during the operation process, the operation process will be paused.

3. The method as described in claim 1, characterized in that, The system automatically cuts off the specified valve position increase / decrease operations based on the second set of preset conditions, including: If any of the following conditions are met, items 0501) to 0505) of the interlock control conditions for adding operation to the fifth valve position will be automatically deactivated: 1301) The unit is in maximum extraction steam heating condition signal and the SSS clutch unlock feedback signal have both been triggered, while the SSS clutch lock feedback signal has not been triggered. 1302) The signal that the unit is in back pressure heating mode has been triggered.

4. The method as described in claim 1, characterized in that, The system automatically cuts off the specified valve position increase / decrease operations based on the second set of preset conditions, including: If any of the following conditions are met, then conditions 1201) to 1205) of the lockout control conditions for the sixth valve position reduction operation will be automatically deactivated: 1401) The unit is in maximum extraction steam heating condition signal and SSS clutch unlock feedback signal have both been triggered, while SSS clutch lock feedback signal has not been triggered. 1402) The signal that the unit is in back pressure heating mode has been triggered.

5. The method as described in claim 1, characterized in that, When the third set of preset conditions is met, a low-level alarm is triggered on the unit, including: When the unit is in back pressure heating mode and the signal has been triggered, if the preset low trip value < low pressure cylinder rotor speed < preset low alarm value, the unit's low pressure cylinder rotor speed low alarm will be triggered.

6. The method as described in claim 1, characterized in that, When the fourth set of preset conditions is met, the unit's low-level interlock trip is triggered, including: When the unit is in back pressure heating mode and the signal has been triggered, if the low pressure cylinder rotor speed is less than or equal to the preset low trip value, the low pressure cylinder rotor speed interlock trip will be triggered.

7. The method as described in claim 1, characterized in that, Based on the preset conditions of the fifth group, corresponding interlock control is performed on the designated valve positions of the third group, including: When the unit is in maximum extraction steam heating operation, the closing feedback signals of the intermediate discharge inlet low-pressure cylinder steam shut-off valve and the intermediate discharge inlet low-pressure cylinder steam regulating valve have all been triggered, and the opening feedback signal has not been triggered, if any of the following conditions are met, the intermediate discharge inlet low-pressure cylinder steam shut-off valve will be fully opened, and the intermediate discharge inlet low-pressure cylinder steam regulating valve will be opened to the preset value: 1501) The low-pressure cylinder rotor speed is ≥ preset value after the preset time value of the coasting process begins; 1502) The preset safety lower limit value < low-pressure cylinder rotor speed ≤ preset safety upper limit value, and the low-pressure cylinder final stage steam temperature > preset safety upper limit value, or the low-pressure cylinder final stage steam temperature > preset safety upper limit value, or the temperature rise rate of either the low-pressure cylinder final stage stator component metal temperature or the low-pressure cylinder final stage steam temperature > preset safety upper limit value. 1503) After the coasting process begins and the preset time has elapsed, the low-pressure cylinder rotor speed exceeds the preset safety upper limit.

8. The method as described in claim 1, characterized in that, Based on the preset conditions of the sixth group, corresponding interlock control is performed on the designated valve positions of the third group, including: When the unit is in back pressure heating mode, the feedback signal for the opening of the steam shut-off valve of the intermediate discharge inlet low-pressure cylinder has been triggered, and the feedback signal for the closing valve has not been triggered, and the automatic control key for the rotor speed of the low-pressure cylinder of the intermediate discharge inlet low-pressure cylinder steam regulating valve has been turned into the active position, if any of the following conditions are met, the interlocking valves of the intermediate discharge inlet low-pressure cylinder steam shut-off valve and the intermediate discharge inlet low-pressure cylinder steam regulating valve will be fully closed: 1601) When the low-pressure cylinder rotor speed is less than or equal to the preset value after a preset time has elapsed since the start of the acceleration process; 1602) The relevant safety parameters of each device are ≥ preset high trip value or |low pressure cylinder rotor speed - low pressure cylinder rotor speed automatic tracking value| ≥ the maintenance time of preset high trip value ≥ the preset time of start of speed-up process or the speed-up rate of low pressure cylinder rotor speed ≥ the maintenance time of preset high trip value ≥ the preset time of start of speed-up process.

9. A back pressure and bypass heating safety protection and control device, characterized in that, The apparatus is used to perform the method according to any one of claims 1 to 8.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of any one of claims 1 to 8.

12. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 8.

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