CN110159365B - Sequence control starting method of double-machine regenerative small steam turbine - Google Patents
Sequence control starting method of double-machine regenerative small steam turbine Download PDFInfo
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- CN110159365B CN110159365B CN201910507408.0A CN201910507408A CN110159365B CN 110159365 B CN110159365 B CN 110159365B CN 201910507408 A CN201910507408 A CN 201910507408A CN 110159365 B CN110159365 B CN 110159365B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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Abstract
The invention discloses a sequential control starting method of a double-machine regenerative small steam turbine, which comprises the following steps: judging that the small engine is in a state of allowing starting and the auxiliary system is in a normal state, and automatically starting the air extraction check valve, the steam supplementing valve and the overflow valve; judging that the check valve, the steam supplementing valve and the overflow valve are in a closed state, automatically starting the drain valve, and controlling the drain valve to stay for a preset time period after the drain valve is in an automatic state; judging that the small steam engine lubricating oil system is in a normal state; judging whether a main steam valve of the small steam turbine is closed and has no fault, and controlling a turning gear of a water feeding pump steam turbine to drive the rotating speed of the water feeding pump steam turbine to be larger than a preset rotating speed value; judging the closing state of the main throttle valve and the main regulating valve, controlling the bypass valve to be opened, and closing the exhaust overflow valve; judging whether the steam quality is qualified, starting the warming machine according to the set warming rotating speed, and keeping a steam supplementing valve and an overflow valve closed in the warming process; judging the end of warming, and setting and tracking the rotating speed to a preset target value; and judging that the actual rotating speed reaches a preset target value, setting the exhaust steam pressure to reach a preset pressure value, and automatically controlling the bypass.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a sequential control starting method of a double-machine regenerative small steam turbine.
Background
With the development of thermal power generation technology and the continuous improvement of unit parameters, the steam temperature, pressure and extraction superheat degree of the unit are higher and higher, and developed countries such as Europe, America and Japan are developing next generation high ultra supercritical unit, and the temperature of the unit can reach 700 ℃. To accommodate such high parameter conditions, the required system equipment material characteristics, grade requirements will increase, and the corresponding procurement and manufacturing costs will increase. Therefore, a double-machine heat regeneration scheme is provided for the mechanism: the conventional small steam turbine of the water supply pump is replaced by additionally arranging the small steam turbine of the high-parameter and high-power steam extraction back pressure type, meanwhile, the steam turbine middle pressure cylinder is not provided with regenerative steam extraction, and corresponding regenerative steam extraction at each stage is led out by the small steam turbine, so that the steam temperature of the extracted steam can be greatly reduced, the construction cost is reduced, and the safety is improved. The introduction of the small heat recovery machine not only meets the requirement of the traditional water feeding pump steam turbine on rotating speed control, but also considers the working conditions of steam extraction, steam exhaust, steam supplement, overflow and the like, has complex control and has great difference from the control mode of the traditional water feeding pump steam turbine. Because the starting of the small machine under the double-machine regenerative framework is designed with more auxiliary systems and the checking and judging of parameters such as the valve state of the steam turbine body, the cylinder temperature, the rotating speed, the pressure and the like, the related equipment types and the operation steps are various and complicated, and if a manual starting mode is adopted, operators are required to have high operation level and strong processing capacity. And the following disadvantages are inevitable when the manual start is carried out: the complicated manual operation can increase the error probability of the operation of an operator and increase the operation pressure of the operator; the manual operation inevitably causes delay of the operation process and low efficiency of the steam turbine because all steps need manual confirmation and judgment of operators.
At present, the sequential control starting research of a water feeding pump steam turbine under a double-machine regenerative system architecture is less, how to consider how to automatically finish the automatic coordination control of related auxiliary systems, steam extraction check valves, drain valves, small main steam valves, main regulating valves, bypass valves, overflow valves, air supply valves, steam quality, rotating speed and the like in the double-machine regenerative system in the starting process of a small machine, the running pressure of an operator in the starting process is reduced, the human-caused faults caused by operation errors of the operator are reduced, and the improvement of the starting efficiency of the small machine has very important significance.
Disclosure of Invention
The invention provides a sequential control starting method of a double-machine regenerative small steam turbine, which aims to solve the technical problem that the conventional sequential control starting can only be manually operated by a worker, so that the automatic starting of the double-machine regenerative water-feeding pump steam turbine is realized through automatic control sequence coordination control, the pressure of manual operation of the operator is reduced, and the starting efficiency of the water-feeding pump steam turbine is also improved.
In order to solve the above technical problem, an embodiment of the present invention provides a sequential control starting method for a dual-machine regenerative small steam turbine, including:
judging whether the small machine is in a starting allowed state, if so, automatically switching an air extraction check valve, a steam supplementing valve and an overflow valve;
judging whether all the check valves, the steam supplementing valves and the overflow valves are in a closed state, if so, automatically switching all the drain valves, and controlling all the drain valves to stay for a preset time period after being in an automatic state;
judging whether the lubricating oil system is in a normal state, if so, continuing to execute subsequent judgment;
judging whether a main throttle valve and a main regulating valve are closed or not and have no fault, if so, controlling a turning gear of a water supply pump steam turbine to drive the rotating speed of the water supply pump steam turbine to be larger than a preset rotating speed value;
judging whether the main throttle valve and the main regulating valve are in a fully closed state again, if so, controlling the bypass valve to be fully opened and controlling the exhaust overflow valve to be fully closed;
judging whether the steam quality is qualified, if so, controlling to start the warming machine according to a set warming rotating speed, and controlling the steam supplementing valve and the overflow valve to be kept closed in the warming process;
judging whether the warming is finished, if so, controlling the rotating speed to set and track to a preset target value;
and judging whether the actual rotating speed reaches a preset target value, if so, controlling the set exhaust pressure to reach a preset pressure value, automatically controlling the bypass, and finishing the starting of the water supply pump steam turbine after the bypass is completely and automatically closed.
As a preferred scheme, the basis for judging that all the check valves, the steam supplementing valves and the overflow valves are in the closed state is as follows: the valve opening degrees of the check valve, the steam supplementing valve and the overflow valve are all less than 5%.
Preferably, the preset time period for controlling all the steam traps to stay automatically is 30 seconds.
Preferably, the main throttle and the main throttle are closed according to the following basis: the main throttle opening is smaller than 3% and is in a closed state, and the main throttle opening is smaller than 3% and is in a closed state.
Preferably, the preset rotating speed value of the water feeding pump turbine which is greater than the rotating speed of the water feeding pump turbine is 9rmp by controlling the turning of the water feeding pump turbine.
Preferably, the criterion for controlling the opening of the bypass valve is that the opening of the bypass valve is greater than 98%.
Preferably, the standard for controlling the closing of the exhaust overflow valve is that the opening degree of the exhaust overflow valve is less than 2%.
As a preferred scheme, the basis for judging whether the steam quality is qualified is as follows: the superheat degree of the steam in front of a main steam valve is more than 56 ℃, the temperature difference of metal at the upper/lower half 3, 4, 5 and 6 pumping sections of an outer cylinder of the water supply pump meets the condition that the temperature is higher than-45 ℃ and lower than 30 ℃, and no fault is judged.
Preferably, the control speed is set to track to a preset target value of 2400 rpm.
Preferably, the preset pressure value reached by the control setting exhaust steam pressure is 0.3 Mpa.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the invention provides a sequential control starting method of a water feeding pump steam turbine under a double-machine regenerative system architecture, which realizes the automatic starting of the double-machine regenerative water feeding pump steam turbine through the sequential coordinated control of an automatic control device, reduces the pressure of manual operation of an operator and improves the starting efficiency of the water feeding pump steam turbine.
Drawings
FIG. 1: the invention is a flow chart of the steps of the double-machine backheating small steam turbine sequential control starting method in the embodiment of the invention;
FIG. 2: the curve of the rising speed of the steam turbine starting under the cold state and the hot state in the embodiment of the invention is shown.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The water feeding pump turbine under the double-machine regenerative system architecture utilizes steam before reheating to drive a backpressure steam extraction water feeding pump turbine, extracts steam from the water feeding pump turbine, utilizes the water feeding pump turbine with lower superheat degree to extract steam and exhaust steam, and heats condensed water and water supply through a heater. The economical efficiency of the whole unit is improved by reducing the end difference of the heater with higher extraction superheat degree. Typically, a 3-pumping 1-row scheme is adopted for a water supply pump turbine, namely, an air source is exhausted by a main engine high-pressure cylinder, the water supply pump turbine supplies 3#, 4# high pressure steam and a deaerator in pumping mode, and the exhausted steam is reduced to 6# low pressure steam. If the air quantity is insufficient, the steam is extracted from the middle pressure cylinder for supplement, and if the air quantity is excessive, the steam overflows to No. 7 low pressure cylinder. In order to realize the sequential control starting of the water feeding pump turbine, a reasonable starting step sequence needs to be established, the automatic control system MEH of the water feeding pump turbine is used for judging the state of the water feeding pump related to the whole unit, and then the control system executes the reasonable step sequence to complete the sequential control starting of the unit. The starting sequence of the water supply pump turbine under the double-machine regenerative system architecture mainly comprises the following processes as shown in fig. 1:
the method comprises the following steps: after the small engine is confirmed to be in a starting allowed state, the air suction check valve, the steam supplementing valve and the overflow valve are put into operation automatically;
step two: determining that all the check valves, the steam supplementing valves and the overflow valves are in a closed state (the opening degree of the valves is less than 5%), automatically putting all the drain valves, and staying for 30s after all the drain valves are in an automatic state;
step three: judging the state of the small turbine wheel lubricating oil system to be normal;
step four: whether a main valve and a main regulating valve are closed (the opening degree is less than 3%) and no fault exists is checked, and the rotating speed of a steam turbine with a water pump of a steam turbine barring of the water pump is more than 9 rmp;
step five: confirming that the main valve and the main regulating valve are in a fully closed state (the opening degree is less than 3%), the bypass valve is fully opened (the opening degree is more than 98%), and the exhaust steam overflow valve is fully closed (the opening degree is less than 2%);
step six: judging the steam quality (the superheat degree of the steam in front of a main steam valve is more than 56 ℃, the metal temperature difference of the upper/lower half 3, 4, 5 and 6 pumping sections of an outer cylinder of a water supply pump meets the condition that the temperature is higher than-45 ℃ and lower than 30 ℃, and no fault exists), starting warming according to the set warming rotating speed after the steam quality is qualified, and keeping the steam supplement and overflow valves closed in the warming process;
step seven: after the warming-up is determined to be finished, the rotating speed is set and tracked to a target value of 2400 rpm;
step eight: when the actual rotating speed reaches the target value, the exhaust pressure is set to be 0.3Mpa, the bypass control is started automatically, and the starting of the water supply pump turbine is finished after all the bypasses are automatically closed.
In this embodiment, the starting of the small steam engine is divided into two modes: cold and hot states. When the metal temperature of the inner wall of the inner cylinder of the small steam turbine is less than 150 ℃, the unit is defined as a cold state, and when the metal temperature of the inner wall of the inner cylinder of the small steam turbine is more than or equal to 150 ℃, the unit is defined as a hot state. The rising speed curves of the starting of the steam turbine under the cold state and the hot state are different, and the unit needs more warm-up time under the cold-state starting mode of the unit. The detailed curve is shown in fig. 2.
When the small turbine is started, the main turbine finishes starting and load increasing (the load of the main turbine of a 1000MW unit is about 300MW), cold and reheated steam of the main turbine is used as a starting steam source of the small turbine, steam source parameters are about 1.0-2.5 MPa (a), the temperature is 250-390 ℃, and the superheat degree requirement is not less than 56 ℃.
The system state when the steam turbine starts is as follows:
a, the main turbine has finished starting and load-up, and the load of the main engine is about 300MW (for a 1000MW unit);
b, #10, #9, #8, #7 low pressure heater complete the input, the steam source comes from the main turbine;
c, completing the input of a deaerator, wherein a steam source comes from auxiliary steam;
d, #1, #2, #3, #4 high pressure heater and #6 low pressure heater were not input.
And in the process of condition, entering a small machine sequential control starting mode, and controlling the small machine starting by adopting a sequential control module.
Before starting, all sleeves and equipment of the steam turbine are inspected, so that the condition is good and correct. The normal power supply, the standby power supply, the compressed air source and the like required by each device are all within normal specifications. The surrounding environment of the unit field is clean and tidy, and the unit field is confirmed to be in a good starting state.
Before the rotor is flushed, the starting test and the automatic starting test of each oil pump of the oil system reach the design requirements, the oil level of the oil tank reaches the design requirements, the oil level indicator works normally, the water inlet and outlet of the oil cooler are smooth, the oil type, the oil quality and the oil temperature meet the design requirements, the exhaust fan on the oil tank is started, before the main oil pump is started, the direct-current lubricating oil pump is used for filling oil into the oil system, after the pipelines, all sleeves and all chambers in the oil system are completely filled with oil, the main oil pump is allowed to supply oil, the oil pressure of each part is adjusted to enable the oil pressure of each part to be stable and meet the design requirements, and all oil pipelines must have no leakage.
In the embodiment, after the lubricating oil pressure is established and the rotating speed of the rotor is determined to be zero, the rotating equipment is started, and the turning gear is thrown in, wherein the turning gear rotating speed is 103 r/min. In order to ensure that the steam turbine rotor does not bend and deform and avoid the generation of unnecessary vibration after the impact rotation, the cold-state starting rotary equipment runs for at least more than 45min before the impact rotation.
And after the rotary equipment is put into operation, confirming that the condenser of the main turbine is vacuumized, and opening the exhaust bypass valve of the small turbine. And simultaneously, putting the steam seal system into operation to send steam to the shaft seal.
Note that: the rotary equipment is not allowed to send steam to the shaft seal when not put into operation, so that the phenomenon that the steam turbine rotor is not bent and deformed due to uneven local heating of the steam turbine rotor to influence the starting and safe operation of the steam turbine is avoided.
And opening a drain valve on a steam pipeline in front of a main valve of the small steam turbine to perform warm pipe work of the steam pipeline, and opening all the drain valves of the body to prepare for starting.
The driven steam feed pump and the feed system confirm that the start-up conditions are met.
Regarding the thrust and the speed of the turbine, the conditions before the thrust: A. after the steam turbine is put into the rotary equipment, the interior of the steam turbine and each shaft seal are monitored to have no abnormal noise, the steam turbine rotor can normally perform turning operation, and the steam-driven water feed pump set has no abnormality; B. steam supply of the front and rear steam seals: the steam pressure range of the shaft seal steam supply is 0.117-0.131 MPa (a), and the temperature range is 280-320 ℃. The extracted steam (gas) of each steam seal of the steam turbine enters a steam seal cooler of a main steam turbine; C. the pressure of a lubricating oil main pipe (corrected to the central line of the unit at 2.8-3.5 bar) is normal, and the EH oil pressure is normal; the temperature of the lubricating oil is normal (after an oil cooler at 46-52 ℃); the oil level of the oil tank is normal (the distance between the normal liquid level and the lower edge of the top plate of the oil tank is 636 mm); D. the state of the small turbine valve in preparation for the kick is given in table 1 below:
TABLE 1 valve State in preparation for Small steam turbine rushing
Testing before impact: note that the following pre-stroke tests were performed to confirm that the isolation valves in front of the main gates of the small turbines were all in a tight closure, to avoid the risk of steam entering the turbine. And after the test is finished, the isolating valve can be fully opened when the main throttle valve and the regulating valve of the small steam turbine are all in the closed positions. The method comprises the following steps: a, quick-closing solenoid valve test: and (3) the quick-closing electromagnetic valve is in a working state, then the main throttle valve and the regulating throttle valve of the small steam turbine are opened, the electromagnetic valve acts, and whether the main throttle valve and the regulating throttle valve of the small steam turbine are normally closed or not is observed. The closing time of each valve is not more than 0.5s (subject to technical agreement). b, oil system test: the oil pumps can be automatically switched according to the oil pressure range specified by the oil system, and the performance is good.
When the steam turbine meets the flushing condition, operators receive a starting instruction, the quick-closing solenoid valves on the main throttle valve servomotor and the regulating throttle valve servomotor of the small steam turbine can be electrified to act according to the situation, after the main throttle valve is fully opened, the servomotor can be slowly (slowly) opened to drive the regulating throttle valve to be opened, and the steam turbine starts to flush. When the rotating speed of the steam turbine is higher than that of the turning gear, the turning gear clutch is automatically disengaged and gives an instruction, so that the turning gear motor stops working, and the lubricating oil supply is cut off. The states of the small turbine valve at the time of the impulse rotation and the speed rise are shown in table 2 below:
TABLE 2 valve State during Small steam turbine revulsions
In the process of the turbine running, if the vibration is larger than the alarm value, the unit alarms; if the vibration is larger than the stop value, the unit is interrupted, and the motor is flushed and rotated after the problem is eliminated. Slowly increasing the speed to 1000r/min idling speed, controlling the speed increasing process, increasing the speed at a speed increasing rate of about 100r/min/min in a cold state, increasing the speed at a speed increasing rate of about 200r/min/min in a hot state, and comprehensively checking the running condition of the unit during the idling speed: the vibration condition of the rotor is normal, abnormal noise does not need to be generated in the monitoring turbine and at each shaft seal position, monitoring and checking are carried out on each instrument, and all the instruments are required to be within a normal range. During idling, namely low-speed warming up, the cold state is not less than 30min, and the hot state is not less than 10 min.
And (4) accelerating the speed of the steam turbine to the lowest working rotating speed, namely 2400r/min, and feeding water for coordinated control after the rotating speed is stabilized. The speed increasing process is controlled, the cold state speed increasing rate is about 250r/min/min, the hot state speed increasing rate is about 300r/min/min, and the speed increasing rate is 500r/min/min when the speed is over the critical rotating speed.
The attention points in the process of the turbine running and the speed raising are as follows: and A, in the speed increasing process, the rotating speed is near the first-order critical rotating speed, and the stopping is avoided. The critical rotation speed value is subject to the actual critical rotation speed value measured in the power station. B, paying attention to the peak-peak value of shaft vibration (relative bearing seat) at the front bearing and the rear bearing of the steam turbine at any time: the turbine must not exceed 0.076mm in the continuous operating speed range. The turbine must not exceed 0.125mm above the critical speed. And C, after the rotating speed of the steam turbine rises, paying attention to the temperature of the lubricating oil, adjusting the amount of cooling water to control the oil temperature at the outlet of the oil cooler to be a stable value of 50 ℃, and controlling the oil temperature of the inlet oil of each bearing to be 46-52 ℃. D, noting that the return oil temperature of the thrust bearing is less than 70 ℃ and not more than 80 ℃ at most; the metal shoe temperature of any bearing must not exceed 107 ℃. And E, gradually closing the drain valves of the drain pipelines according to the drain quantity when the load of the main unit reaches about 40%. F, the running condition of the driven steam feed water pump is also noticed in the process of the turbine running and the speed increasing.
And (3) steam exhaust switching: according to an instruction of inputting a #6 low-pressure heater by the DCS, slowly opening a butterfly valve (DCS control) on a #6 low-pressure steam extraction pipeline to switch the steam exhaust to #6 low-pressure steam extraction, controlling the opening speed of the butterfly valve by the DCS, and maintaining the change rate of the #6 low heating degree not to exceed 3 ℃/min; the small turbine exhaust bypass valve follows the backpressure set value of 0.3MPa (a), the small turbine exhaust bypass valve is gradually closed along with the opening of the butterfly valve, and after the butterfly valve is completely opened, the exhaust switching is finished; and the steam exhaust pressure, the steam exhaust temperature and the final-stage combined pressure ratio protection are required to be put into the switching process. The state of the small turbine valve at the time of back pressure switching is shown in table 3 below:
TABLE 3 valve State at Small steam turbine exhaust steam switch
Closing the exhaust bypass valve: the small turbine exhaust bypass valve continuously tracks the set value of backpressure of 0.3MPa (a), and the small turbine exhaust bypass valve is sequentially fed into a deaerator (#5), #4 high pressure addition and #3 high pressure addition. After #3 high pressure input is finished, the state of the small turbine exhaust bypass valve is checked, and if the small turbine exhaust bypass valve is in an open state, the small turbine exhaust bypass valve is turned off. The valve states of the small turbine are as follows 4:
| valve gate | Status of state |
| Main steam valve of small steam turbine | Open |
| Steam regulating valve for small steam turbine | Opening, controlling the rotational speed |
| Small steam turbine exhaust safety valve 1 | Close off |
| Exhaust check valve of small steam turbine | Open |
| Small steam turbine exhaust safety valve 2 | Close off |
| Small turbine overflow butterfly valve (DCS) | Close off |
| Overflow regulating valve of small steam turbine | Close off |
| Overflow check valve for small steam turbine | Close off |
| #6 low-filling steam-supplementing check valve | Close off |
| #6 low-pressure steam supply regulating valve | Close off |
| #6 Low steam supplementing butterfly valve (DCS) | Close off |
| Exhaust bypass valve of small steam turbine | Close off |
| #6 steam extraction butterfly valve (DCS) | Open |
| #6 steam extraction check valve | Open |
TABLE 4 valve State at the completion of Small steam turbine Start
So far, the small turbine completes the whole process of starting and increasing the speed to the working speed, switching the steam exhaust to #6 low pressure, and closing the steam exhaust bypass valve of the small turbine, and can prepare for switching the electric pump and the steam pump.
Note that 1: and in the whole starting process, the small steam turbine overflow regulating valve and the #6 low-pressure steam-supplementing regulating valve are both in a closed state.
Note that 2: commands for putting the #6 low-pressure heater, the oxygen remover (#5), the #4 high-pressure heater and the #3 high-pressure heater are from DCS.
Opening butterfly valve (DCS): after the small turbine finishes starting, the DCS controls to open the small turbine overflow butterfly valve and the #6 low-steam-adding butterfly valve.
The method realizes the sequential control starting of the small steam turbine under the double-machine regenerative system architecture by combing the reasonable complex starting process of the small steam turbine under the double-machine regenerative system architecture and designing the reasonable sequential control step, avoids the influence of human factors such as misoperation of operators and the like on the safe and stable starting of the steam turbine, shortens the starting time and improves the operating efficiency. Because the sequential control starting of the first double-machine small heat-regenerative machine is carried out globally, the method has reference and demonstration significance for the subsequent double-machine small heat-regenerative machines.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (10)
1. A sequential control starting method of a double-machine regenerative small steam turbine is characterized by comprising the following steps:
judging whether the small machine is in a starting allowed state, if so, automatically switching an air extraction check valve, a steam supplementing valve and an overflow valve;
judging whether all the check valves, the steam supplementing valves and the overflow valves are in a closed state, if so, automatically switching all the drain valves, and controlling all the drain valves to stay for a preset time period after being in an automatic state;
judging whether the lubricating oil system is in a normal state, if so, continuing to execute subsequent judgment;
judging whether a main throttle valve and a main regulating valve are closed or not and have no fault, if so, controlling a turning gear of a water supply pump steam turbine to drive the rotating speed of the water supply pump steam turbine to be larger than a preset rotating speed value;
judging whether the main throttle valve and the main regulating valve are in a fully closed state again, if so, controlling the bypass valve to be fully opened and controlling the exhaust overflow valve to be fully closed;
judging whether the steam quality is qualified, if so, controlling to start the warming machine according to a set warming rotating speed, and controlling the steam supplementing valve and the overflow valve to be kept closed in the warming process;
judging whether the warming is finished, if so, controlling the rotating speed to set and track to a preset target value;
and judging whether the actual rotating speed reaches a preset target value, if so, controlling the set exhaust pressure to reach a preset pressure value, automatically controlling the bypass, and finishing the starting of the water supply pump steam turbine after the bypass is completely and automatically closed.
2. The sequential control starting method of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the basis for judging that all the check valves, the steam supplementing valve and the overflow valve are in the closed state is as follows: the valve opening degrees of the check valve, the steam supplementing valve and the overflow valve are all less than 5%.
3. The method for the sequential control starting of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the time period for controlling all the steam traps to stay automatically and then stay is set to 30 seconds.
4. The sequential control starting method of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the closing of the main steam valve and the main regulating valve is based on the following steps: the main throttle opening is smaller than 3% and is in a closed state, and the main throttle opening is smaller than 3% and is in a closed state.
5. The method for the sequential control starting of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the preset rotating speed value for controlling the turning of the water feeding pump turbine to bring the rotating speed of the water feeding pump turbine to be higher than the rotating speed of the water feeding pump turbine is 9 rmp.
6. The method for the sequential control starting of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the standard for controlling the opening of the bypass valve is that the opening degree of the bypass valve is greater than 98%.
7. The sequential control starting method of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the standard for controlling the closing of the exhaust steam overflow valve is that the opening degree of the exhaust steam overflow valve is less than 2%.
8. The sequential control starting method of the double-machine regenerative small steam turbine as claimed in claim 1, wherein the criterion for judging the qualified steam quality is as follows: the superheat degree of the steam in front of a main steam valve is more than 56 ℃, the temperature difference of metal at the upper/lower half 3, 4, 5 and 6 pumping sections of an outer cylinder of the water supply pump meets the condition that the temperature is higher than-45 ℃ and lower than 30 ℃, and no fault is judged.
9. The method for controlling the start-up of a twin regenerative steam turbine as set forth in claim 1, wherein the control speed is set to track to a preset target value of 2400 rpm.
10. The method for controlling the start of a twin regenerative steam turbine as set forth in claim 1, wherein the preset pressure value to which the set exhaust pressure is set is 0.3 Mpa.
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| CN112012803B (en) * | 2020-07-29 | 2023-08-18 | 陕西北元化工集团股份有限公司 | Operation method for optimized starting of steam turbine |
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