CN109519232B - Synchronous automatic regulation control method for rotation speed of SHRT unit frequency converter and steam turbine - Google Patents
Synchronous automatic regulation control method for rotation speed of SHRT unit frequency converter and steam turbine Download PDFInfo
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- CN109519232B CN109519232B CN201811155295.4A CN201811155295A CN109519232B CN 109519232 B CN109519232 B CN 109519232B CN 201811155295 A CN201811155295 A CN 201811155295A CN 109519232 B CN109519232 B CN 109519232B
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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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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a synchronous automatic regulation control method for the rotating speed of a SHRT unit frequency converter and a steam turbine, which comprises the following steps: (1) setting a rotating speed regulation rate A in a frequency converter; (2) detecting the working condition in real time, and executing the step (3) if the unit needs to run at the speed increasing; if the unit is required to run at a reduced speed, executing the step (4); (3) and (3) controlling the operation of the unit at the reduced rotating speed: the method comprises the steps that a frequency converter sends a speed reduction preparation command to a DEH, a steam turbine is switched to a rotating speed regulation mode from a power regulation mode, after the switching is completed, an instrument control system judges whether a unit meets a speed reduction condition, if yes, the DEH feeds back a speed reduction permission signal to the frequency converter, and after the frequency converter receives the permission signal, the speed reduction regulation of the unit is executed; (4) and controlling the rotation speed increasing operation of the unit. The method of the invention does not need human intervention, and effectively solves the problem of frequency converter fault shutdown caused by motor current fluctuation in the speed regulation process. Meanwhile, the frequency conversion adjustment SHRT machine set generates great economic benefits for enterprises.
Description
Technical Field
The invention belongs to the field of waste heat power generation technology, is applied to energy recycling equipment in a ferrous metallurgy process, and particularly relates to a synchronous automatic regulation control method for the rotating speed of a SHRT unit frequency converter and a steam turbine.
Background
The energy consumption of the steel industry in China accounts for 16.3% of the total national energy consumption, the energy consumption sources mainly comprise two working sections of sintering and ironmaking, wherein the sintering working section accounts for 10-20% and is only 70% of the ironmaking working section, so that the optimization of a sintering process and a power equipment system to realize energy conservation and emission reduction is particularly important. The sintering main exhaust fan is necessary active equipment for a sintering process, and is driven by a motor to operate to supply air for a sintering system. The recovered waste heat of the sintering system is mainly generated at 3-5 smoke boxes behind the sintering machine and a first smoke hood of the cooling machine through a waste heat boiler, and a waste heat turbine is used for driving a generator to generate electricity.
The traditional sintering waste heat generating set and the motor dragging the sintering main exhaust fan set are two independent sets, belong to different plants and are power rotating equipment with different purposes. The sintering waste Heat energy Recovery and sintering main exhaust fan combined unit (Sinter gas residual Heat Recovery Turbine), abbreviated as SHRT unit, as shown in fig. 1, is formed by integrally matching a sintering waste Heat generator set and a sintering main exhaust fan set, and comprises a sintering fan 3, a variable speed clutch 2, a low-temperature waste Heat Turbine 1, a motor 4, an instrument control system 5 and an MCC system 6 (electrical control system). The SHRT unit configuration mode has the advantages that: firstly, a generator is cancelled, the energy recovered by sintering waste heat is directly supplemented on a shaft system as rotary mechanical energy by the unit, the main sintering exhaust fan is coaxially driven with a motor, and the motor only needs to output the power difference between the energy consumption of the main sintering exhaust fan and the work done by a waste heat turbine. The current of the original motor is reduced, so that the motor driving the sintering main exhaust fan reduces the current on line to realize energy conservation; secondly, power is not supplied to a local power grid, so that power supply approval procedures are reduced; thirdly, compared with a waste heat generator set, the energy recovery rate is improved by 6-8%; fourthly, recovering the residual heat energy of the unit by 60 to 80 percent; fifthly, the investment of equipment, factory buildings and other materials is reduced. On the basis, if the SHRT unit can realize variable frequency operation, the energy can be recovered efficiently, and meanwhile, the consumption of electric energy can be reduced more effectively.
At present, when an SHRT unit is used, in the process that a motor 4 regulates speed through a frequency converter 7, the speed reduction is taken as an example to illustrate that in the speed reduction process, the motor 4 bears a large reverse torque due to the work of a steam turbine 1, so that the current of the motor 4 is continuously reduced, and the motor 4 enters a power generation state (because the rotating speed of a stator of the motor 4 is less than the rotating speed of a rotor), the motor 4 reversely inputs electric energy to a power grid through the frequency converter 7, but a common two-quadrant frequency converter does not have the function of reverse input, in this case, the direct current bus voltage of the frequency converter 7 is continuously increased, and finally the frequency converter 7 is tripped due to failure to cause the interlocking stop of. Therefore, how to realize the stability of the speed regulation process of the set in the frequency conversion process by the SHRT set is an urgent problem to be solved.
Disclosure of Invention
Aiming at the problem of controlling the rotating speed of the set in the variable frequency process of the SHRT set, the invention aims to provide a control method for synchronous automatic adjustment of a steam turbine in the variable frequency and reduced speed process of the SHRT set.
In order to achieve the purpose, the invention adopts the following technical scheme to solve the problem:
a synchronous automatic regulation control method for rotation speeds of a frequency converter and a steam turbine of an SHRT unit specifically comprises the following steps:
(1) setting a rotating speed regulation rate A in a frequency converter;
(2) detecting the working condition in real time, and executing the step (3) if the unit needs to run at the speed increasing; if the unit is required to run at a reduced speed, executing the step (4);
(3) the method comprises the following steps of (1) controlling the operation of the unit by reducing the rotating speed, and specifically:
the frequency converter sends a 'preparation deceleration' instruction to the DEH, the steam turbine is switched to a rotating speed regulation mode from a power regulation mode, after the switching is completed, the instrument control system judges whether the unit meets the deceleration condition, if so, the DEH feeds back a 'speed reduction allowed' signal to the frequency converter, and after the frequency converter receives the allowed signal, the speed reduction regulation of the unit is executed, and the method comprises the following operations:
1) in the 1 st s, the motor reduces the rotation speed by A through a frequency converter;
2) and in the 2s, controlling the opening of a turbine regulating valve through DEH to turn the turbine down by A.
3) And (3) detecting the current of the motor in real time, and repeating the steps 1) and 2) after the current is stabilized until the rotating speed of the motor reaches a target value, and finishing the rotating speed reduction process.
(4) The unit speed rising operation control specifically operates as follows: and keeping the opening of the regulating valve of the steam turbine to be regulated unchanged, and increasing the rotating speed of the motor through the frequency converter until the rotating speed of the unit reaches a target value.
Further, the speed regulation precision of the frequency converter is equal to the regulation precision of DEH, unit: revolutions per second.
Further, in the step (4), the speed increasing rate of the motor is 6-10 revolutions per second.
Further, the method comprises the following steps: the inlet pressure control of the steam turbine is specifically operated as follows:
when the rotation speed of the unit is adjusted to the target rotation speed and the current of the motor is stable, the opening of the steam turbine is controlled through the DEH to adjust the opening of the steam valve, so that the inlet pressure of the steam turbine is always set pressure.
Compared with the prior art, the method has the following advantages:
1. the method of the invention does not need human intervention, ensures the stability of the motor current in the process of increasing the rotating speed of the unit, and effectively solves the problem of frequency converter fault tripping caused by the fluctuation of the motor current in the speed regulating process.
2. In the method, the rotating speed of the steam turbine changes along with the motor, and the control of the steam turbine belongs to follow-up control, so that the advantages are highlighted under the condition of low DEH control precision, and the requirement on a speed control algorithm is not high.
3. By applying the method of the invention, the SHRT unit is adjusted by frequency conversion, and the electric energy is further saved.
Drawings
Fig. 1 is a schematic structural diagram of an SHRT unit to which the method of the present invention is applied.
FIG. 2 is a block diagram of a dual closed loop control for turbine inlet pressure and turbine governor opening control.
The invention is further explained below with reference to the drawings and the detailed description.
Detailed Description
The invention firstly analyzes the problems of the unit in the variable-frequency speed regulation process by researching a process system of a combined driving unit of the sintering waste heat recovery and the sintering fan and the working principle of the motor and a matched frequency converter thereof, and provides a unit speed regulation control method.
The following problems possibly encountered in the speed regulation process of the variable-frequency SHRT set are analyzed according to the attached drawings: under the condition that the unit is started and normally operated, due to the change of working conditions (such as the requirement on sintering air draft is reduced), the unit needs to be operated at a reduced speed, the speed reduction process takes the motor 4 as a main part, the steam turbine 1 is matched for speed regulation, if the steam turbine 1 does not participate in the matched regulation, the rotating speed of the motor 4 is directly reduced through the frequency converter 7, as a result, although the rotating speed of a stator of the motor 4 is reduced, the rotating speed of a rotor of the motor 4 is not reduced (or is slowly reduced) under the dragging of the steam turbine 1, the motor 4 enters a power generation state, the current of the motor 4 is continuously reduced, the motor 4 starts to reversely input electric energy to the frequency converter 7, the direct-current bus voltage of the frequency converter 7 is. Based on this, the invention proposes that the steam turbine 1 must also participate in the regulation during the motor speed reduction process, and the idea is to regulate the speed of the steam turbine 1 to reduce together through the DEH502 (and the method is also used for regulating the unit speed increase).
Referring to fig. 1, the variable frequency regulation SHRT unit applied by the method of the present invention includes a steam turbine 1, a variable speed clutch 2, a sintering fan 3 with two output shafts, a motor 4, an instrument control system 5 (including MIS501, DEH502, PIC503), an MCC system (electrical control system) 6, a VFDS variable frequency speed regulation system 7, and an FCV (steam turbine regulating valve) 10, wherein one output shaft end of the sintering fan 3 is coaxially connected with the motor 4, and the other output shaft end is coaxially connected with the steam turbine 1 through the variable speed clutch 2 (when the rotating speed of the steam turbine 1 reaches the meshing rotating speed, the variable speed clutch 2 meshes and works as a shafting).
The main components in fig. 1 are explained first:
SE 12: and the rotating speed sensor is used for detecting the rotating speed of the steam turbine 1.
ZT 9: and the valve position transmitter is used for detecting the opening degree of the steam turbine regulating valve FCV 10.
PT 11: the turbine 4 inlet pressure transmitter.
DEH 502: the electrohydraulic adjusting system adjusts the opening degree of a turbine adjusting valve 10 by outputting a 4-20 mA control signal to a servo valve 8 (such as a VOITH valve), so that the rotation speed/power of a turbine can be adjusted. Which forms a closed loop control system by receiving a feedback signal of the valve position transmitter ZT9 and comparing it with a control signal.
VFDS 7: and the variable-frequency speed regulation driving system is a frequency converter.
The current transformer 202: included in the frequency converter 7 for the detection of the current of the motor 4.
MCC 6: and a motor control center, namely an electric control system.
PIC 503: the turbine inlet pressure controller is a closed-loop control loop, measured values come from a pressure transmitter PT11, and set values are manually set according to process requirements.
Engagement switch ZS 201: for detecting whether the transmission clutch and the coupling are engaged.
The following describes the specific implementation of the present invention:
step 1, speed regulation of a variable frequency SHRT unit. The method specifically comprises the following substeps:
(1) setting a rotating speed regulation rate in a frequency converter VFDS 7;
normally, the speed regulation accuracy of the frequency converter 7 is higher than that of the DEH502, so the minimum value of the regulation rate is limited by the regulation accuracy of the DEH502, that is, the regulation accuracy a of the DEH502 can be regarded as the rotation speed regulation rate, unit: revolutions per second.
(2) Detecting the working condition in real time, and executing the step (3) if the unit needs to run at the speed increasing; if the unit is required to run at a reduced speed, executing the step (4);
(3) the method comprises the following steps of (1) controlling the operation of the unit by reducing the rotating speed, and specifically:
converter VFDS7 sends "prepare the speed reduction" instruction to DEH502, and steam turbine 1 switches to the rotational speed regulation mode from the power regulation mode, and after the switching is accomplished, instrument control system 5 judges whether the unit satisfies the speed reduction condition (unit operation is normal promptly, does not have the alarm item), if satisfies, DEH502 feedback "allow the speed reduction" signal to converter 7, and after converter 7 received the permission signal, execution unit speed reduction regulation includes following operation:
1) in the 1 st s, the motor 4 reduces the rotation speed A through the frequency converter 7;
2) in the 2s, the opening degree of the turbine regulating valve 10 is controlled by the DEH502, and the turbine 1 is turned down by a (that is, the turbine 1 is turned down by a based on the actual rotation speed before speed regulation).
3) Detecting the current of the motor 4 in real time, repeating the steps 1) and 2) after the current is stabilized (the program automatically judges that the fluctuation is within an allowable range, such as +/-2%), until the rotating speed of the motor 4 reaches a target value (the target rotating speed value is manually set), and finishing the rotating speed reduction process.
(4) The method comprises the following steps of controlling the rotation speed increasing operation of the unit, and specifically:
in the speed increasing process, the rotating speed of the steam turbine 1 does not participate in regulation (namely the opening of a regulating valve FCV10 of the steam turbine is kept unchanged), and the rotating speed of the motor 4 is increased through a frequency converter 7 until the rotating speed of the unit reaches a target value (the target value of the rotating speed is manually and conventionally set); when the motor 4 rotates by 7 liters of the frequency converter, the steam turbine 1 is unloaded suddenly, and the rotating speed of the steam turbine 1 naturally rises along with the motor 4, so that the speed of the motor 4 is limited to 6-10 rpm in order to ensure that the steam turbine 1 can timely follow the motor 4 to rotate.
Step 2, the steam turbine 1 enters an inlet pressure control mode
Since the steam at the inlet of the steam turbine 1 comes from the boiler, if the steam turbine inlet pressure PT11 is not controlled, the safe operation of the boiler is directly influenced, so that the stability of the steam turbine inlet pressure PT11 is very important for the process. The specific operation is as follows:
when the rotation speed of the unit is adjusted to the target rotation speed and the current of the motor 4 is stable, a double closed loop system (shown in fig. 2) consisting of a PIC503 controller, a DEH502, a servo valve 8, a valve position transmitter ZT9 and a pressure transmitter 11 is subjected to automatic control, namely, the DEH502 is used for controlling the opening of a steam turbine regulating valve 10 to stabilize the inlet pressure of the steam turbine 1 to be the set pressure all the time. Therefore, the steam turbine 1 can do work for the whole shafting on the premise of stable inlet pressure, the power consumption of the motor 4 is reduced, and the energy-saving effect is achieved. And ending the speed reduction process of the unit, and normally operating the unit.
The method solves the problems existing in the speed regulation process of the variable frequency regulation SHRT unit, and can be seen that the rotating speed of the steam turbine 1 is actively regulated along with the motor 4 in the method, so that the method has more advantages under the condition of higher control precision of DEH502, the current of the motor 4 is stable in the whole speed regulation process, no manual intervention is needed in the speed regulation process, and the method has high automation degree. In addition, the SHRT unit improves the recovery rate of energy from the working principle, and the variable frequency regulation SHRT unit is not more than better and more expensive, and saves electric energy to a greater extent, so the method has great significance and can bring great economic benefit and value to enterprises. The method of the invention is verified in a Handan iron and steel SHRT project unit, the motor current is relatively stable in the whole speed regulating process, the speed regulating process is fully automatic, no human intervention is needed, and the problem of frequency converter fault shutdown caused by motor current fluctuation in the speed reducing process is effectively solved.
Claims (4)
1. A synchronous automatic regulation control method for the rotating speed of a frequency converter and a steam turbine of an SHRT unit is characterized by comprising the following steps:
(1) setting a rotating speed regulation rate A in a frequency converter;
(2) detecting the working condition in real time, and executing the step (3) if the unit needs to operate at a reduced rotating speed; if the unit is required to run at the speed increasing, executing the step (4);
(3) the method comprises the following steps of (1) controlling the operation of the unit by reducing the rotating speed, and specifically:
the frequency converter sends a 'preparation deceleration' instruction to the DEH, the steam turbine is switched to a rotating speed regulation mode from a power regulation mode, after the switching is completed, the instrument control system judges whether the unit meets the deceleration condition, if so, the DEH feeds back a 'speed reduction allowed' signal to the frequency converter, and after the frequency converter receives the allowed signal, the speed reduction regulation of the unit is executed, and the method comprises the following operations:
1) in the 1 st s, the motor reduces the rotation speed by A through a frequency converter;
2) in the 2s, controlling the opening of a turbine regulating valve through DEH, and rotating the turbine by A;
3) detecting the current of the motor in real time, and repeating the steps 1) and 2) after the current is stable until the rotating speed of the motor reaches a target value, and finishing the rotating speed reduction process;
(4) the unit speed rising operation control specifically operates as follows: and keeping the opening of the regulating valve of the steam turbine to be regulated unchanged, and increasing the rotating speed of the motor through the frequency converter until the rotating speed of the unit reaches a target value.
2. The synchronous automatic regulation and control method for the rotating speed of the frequency converter and the steam turbine of the SHRT unit according to claim 1, characterized in that the speed regulation precision of the frequency converter is equal to the regulation precision of DEH, unit: revolutions per second.
3. The method for controlling synchronous automatic regulation of the rotating speed of the frequency converter and the turbine of the SHRT unit according to claim 1, wherein in the step (4), the speed increasing rate of the motor is 6-10 r/s.
4. The synchronous automatic regulating and controlling method for the rotating speed of the frequency converter and the turbine of the SHRT unit according to claim 1, characterized by further comprising the steps of: the inlet pressure control of the steam turbine is specifically operated as follows:
when the rotation speed of the unit is adjusted to the target rotation speed and the current of the motor is stable, the opening of the steam turbine is controlled through the DEH to adjust the opening of the steam valve, so that the inlet pressure of the steam turbine is always set pressure.
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| CN110067757B (en) * | 2019-04-02 | 2021-04-02 | 南通常安能源有限公司 | Steam-electricity dual-drive control system and control method based on induced draft fan |
| CN111412023A (en) * | 2020-04-03 | 2020-07-14 | 荣信汇科电气技术有限责任公司 | Coordination control method for realizing stable operation of steam-electricity dual-drive system |
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| CN113389604B (en) | 2021-07-20 | 2023-05-02 | 海南极锐浩瀚动力***科技有限公司 | Automatic load regulation, operation and protection method for combined dragging power generation of converter saturated steam turbine and motor |
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