CN113031681A - Condensation depth frequency conversion optimization method for thermal generator set - Google Patents
Condensation depth frequency conversion optimization method for thermal generator set Download PDFInfo
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Abstract
The invention discloses a condensation depth variable frequency optimization method for a thermal generator set, which comprises the following steps of (1) enabling a control loop to be a function that the opening of a main regulating valve is a furnace side load, and enabling the main regulating valve to have no pressure regulating function; (2) a dead zone of 20MW is arranged at a switching point between the water level of the variable-frequency regulating deaerator and the water level of the main regulating valve regulating deaerator; (3) setting an important fixed value; (4) when the variable frequency pump operates, the standby power frequency pump is started in an interlocking manner; (5) the variable frequency pump operates, the standby power frequency pump is started in an interlocking manner, and the auxiliary regulating valve is closed forcibly; (6) when the main control instruction of the boiler is more than 450MW and the low bypass degree is more than 30%, and the industrial frequency pump is started in an interlocking way, the instruction of the variable frequency pump is increased by 300RPM instantly. The invention optimizes the work of deep frequency conversion of the coagulation pumps in series, and the power consumption of the coagulation pumps reaches the optimal level of the power consumption of the coagulation pumps of the same type of units, thereby being safe and reliable.
Description
Technical Field
The invention relates to a condensation water depth frequency conversion optimization method for a thermal generator set.
Background
A condensate pump in a thermal power plant supplies water to a deaerator by adopting frequency conversion control, and simultaneously needs to provide a water source for related users. The operating mode of the power generation system is that Jiangsu Nantong power generation Limited company (Soutong power plant for short) is put into production in 2014, condensed water at the initial stage of production is subjected to frequency conversion to adjust pressure, a main regulating valve is used for adjusting the water level of a deaerator, an auxiliary regulating valve is completely closed (the auxiliary regulating valve is only used for low-flow regulation at the initial stage of unit starting), the auxiliary regulating valve is completely closed under the full-load condition, the main regulating valve is throttled to a large extent, the regulating range of the regulating valve is 30-50%, the power consumption of a condensing pump is about 0.21%, and the power consumption of a plant is large.
Disclosure of Invention
The invention aims to provide a condensation water depth frequency conversion optimization method of a thermal generator set, which has low power consumption and safe operation.
The technical solution of the invention is as follows:
a method for optimizing condensation depth frequency conversion of a thermal generator set is characterized by comprising the following steps: comprises the following steps:
(1) the control loop is referred to as the 'main regulating valve opening is a function of the load on the furnace side', so that the main regulating valve does not have the pressure regulating function, and the following table is used for:
comparison table of main regulating valve opening and boiler main control instruction
(2) The dead zone that the switch point was equipped with 20MW between frequency conversion regulation oxygen-eliminating device water level or the main governing valve regulation oxygen-eliminating device water level:
a) when the furnace side load is larger than 530MW, the water level of the deaerator is adjusted in a frequency conversion mode, and the opening degree of a main adjusting valve is a function of the upper furnace side load;
b) when the load on the furnace side is less than 510MW, the main regulating valve regulates the water level of the deaerator, and the condensed water pressure is regulated through frequency conversion; (the pressure setting is already built into the control loop and the operator normally does not need to adjust the pressure according to the load, but can make corrections by means of the pressure offset).
(3) Important fixed value:
when the frequency and the frequency are changed, the set value of the outlet pressure of the condensing pump is 1.7 MPa;
when the frequency conversion water level is changed, and the condensed water pressure at the outlet of the fine processing device is lower than 1.6MPa, the frequency conversion rotating speed is forbidden to be reduced;
in a fine processing PLC "# 1 machine prefilter parameter setting" picture, the constant value that the system inlet pressure is low and the automatic fine processing quit is 1.2 MPa;
(4) when the variable frequency pump operates, the interlocking of the standby power frequency pump is started:
a) the main control instruction of the boiler is more than 450MW, and the low bypass degree is more than 30%;
b) the pressure of an outlet main pipe of the condensing pump is less than 1.5 MPa;
c) tripping the variable frequency pump;
note that: any power frequency joint start can make variable frequency control switch manually, and the main governing valve can be automatically switched to the deaerator water level regulating loop (the prerequisite is that the main governing valve control station is automatic). When the frequency conversion pump is tripped, after the interlocking of the power frequency pump is started, the main regulating valve is instantly closed to a certain opening (the opening is a function of the load of the boiler), but the interlocking of the power frequency pump caused by low-side opening (more than 30 percent of opening) and low pressure of the condensate pump outlet can not close the main regulating valve in an interlocking way.
Comparison table of main regulating valve opening and boiler main control instruction when power frequency condensate pump is started jointly
(5) The variable frequency pump runs, the standby power frequency pump is started in an interlocking mode, and the auxiliary regulating valve is closed forcibly (pulse for 40 seconds);
(6) when the main control instruction of the boiler is more than 450MW and the low bypass degree is more than 30%, and the industrial frequency pump is started in an interlocking way, the instruction of the variable frequency pump is increased by 300RPM (the instruction rotating speed is not more than 1300RPM) instantly (1 second pulse).
And setting a manual variable-frequency pump jump alarm.
And setting the logic of a boiler MFT forced closing main adjusting valve and an auxiliary adjusting valve.
The aperture of the condensed water main regulating valve is a 16' pneumatic regulating valve. The pressure difference between the front and the back of the condensate main regulating valve is 0.2-0.35MPa after the condensate main regulating valve is modified, the current of the condensate pump is reduced by 20-40A, and the operation condition is normal.
Further carrying out deep frequency conversion, and reducing the lowest rotation speed of the condensate pump to 27HZ/810 rpm.
Further logic optimization is as follows:
(1) the dead zone that the switch point was equipped with 20MW between frequency conversion regulation oxygen-eliminating device water level or the main governing valve regulation oxygen-eliminating device water level:
a) when the furnace side load is larger than 420MW, the water level of the deaerator is adjusted in a frequency conversion mode, and the opening degree of a main adjusting valve is a function of the upper furnace side load;
b) when the load on the furnace side is less than 400MW, the main regulating valve regulates the water level of the deaerator, and the frequency conversion regulates the condensed water pressure;
(2) important fixed value:
a) when the frequency and the pressure are regulated, the set value of the outlet pressure of the condensing pump is 1.15 MPa;
b) when the frequency conversion water level is changed, and the condensed water pressure at the outlet of the fine processing device is lower than 1.15MPa, the frequency conversion rotating speed is forbidden to be reduced;
c) in a fine processing PLC "# 1 machine prefilter parameter setting" picture, the constant value that the system inlet pressure is low and the automatic fine processing quit is 0.8 MPa;
(3) when the variable frequency pump operates, the interlocking of the standby power frequency pump is started:
a) the main control instruction of the boiler is more than 450MW, and the low bypass degree is more than 30%;
b) the pressure of a condensate outlet main pipe (10LCA20CP001) < 1 MPa;
c) and tripping the variable frequency pump.
According to the invention, through the deep frequency conversion optimization work of the series coagulation pumps, the power consumption of the coagulation pumps reaches the optimal level of the power consumption of the coagulation pumps of the same type of units. The safety and the reliability are realized; meanwhile, the electricity consumption of the condensate pump is reduced by 0.075 percentage point compared with the initial production period, the annual electricity generation amount is 100 hundred million kilowatts, the plant electricity consumption can be saved by 750 ten thousand kilowatts per year, the average online electricity price per kilowatt hour in 2017 is 0.37 yuan, the economic benefit can be generated by about 277.5 ten thousand yuan per year, and the economic benefit is considerable.
The invention is further illustrated by the following figures and examples.
Fig. 1 is a condensate logic optimization curve.
FIG. 2 is a schematic diagram showing the power consumption trend of the condensing pump before and after optimization.
Detailed Description
A method for optimizing condensation depth frequency conversion of a thermal generator set comprises the following steps:
(1) the control loop is referred to as the 'main regulating valve opening is a function of the load on the furnace side', so that the main regulating valve does not have the pressure regulating function, and the following table is used for:
comparison table of main regulating valve opening and boiler main control instruction
(2) The dead zone that the switch point was equipped with 20MW between frequency conversion regulation oxygen-eliminating device water level or the main governing valve regulation oxygen-eliminating device water level:
a) when the furnace side load is larger than 530MW, the water level of the deaerator is adjusted in a frequency conversion mode, and the opening degree of a main adjusting valve is a function of the upper furnace side load;
b) when the load on the furnace side is less than 510MW, the main regulating valve regulates the water level of the deaerator, and the condensed water pressure is regulated through frequency conversion; (the pressure setting is already built into the control loop and the operator normally does not need to adjust the pressure according to the load, but can make corrections by means of the pressure offset).
(3) Important fixed value:
when the frequency and the frequency are changed, the set value of the outlet pressure of the condensing pump is 1.7 MPa;
when the frequency conversion water level is changed, and the condensed water pressure at the outlet of the fine processing device is lower than 1.6MPa, the frequency conversion rotating speed is forbidden to be reduced;
in a fine processing PLC "# 1 machine prefilter parameter setting" picture, the constant value that the system inlet pressure is low and the automatic fine processing quit is 1.2 MPa;
(4) when the variable frequency pump operates, the interlocking of the standby power frequency pump is started:
a) the main control instruction of the boiler is more than 450MW, and the low bypass degree is more than 30%;
b) the pressure of an outlet main pipe of the condensing pump is less than 1.5 MPa;
c) tripping the variable frequency pump;
note that: any power frequency joint start can make variable frequency control switch manually, and the main governing valve can be automatically switched to the deaerator water level regulating loop (the prerequisite is that the main governing valve control station is automatic). When the frequency conversion pump is tripped, after the interlocking of the power frequency pump is started, the main regulating valve is instantly closed to a certain opening (the opening is a function of the load of the boiler), but the interlocking of the power frequency pump caused by low-side opening (more than 30 percent of opening) and low pressure of the condensate pump outlet can not close the main regulating valve in an interlocking way.
Comparison table of main regulating valve opening and boiler main control instruction when power frequency condensate pump is started jointly
(5) The variable frequency pump runs, the standby power frequency pump is started in an interlocking mode, and the auxiliary regulating valve is closed forcibly (pulse for 40 seconds);
(6) when the main control instruction of the boiler is more than 450MW and the low bypass degree is more than 30%, and the industrial frequency pump is started in an interlocking way, the instruction of the variable frequency pump is increased by 300RPM (the instruction rotating speed is not more than 1300RPM) instantly (1 second pulse).
And setting a manual variable-frequency pump jump alarm.
And setting the logic of a boiler MFT forced closing main adjusting valve and an auxiliary adjusting valve.
The aperture of the condensed water main regulating valve is a 16' pneumatic regulating valve. The pressure difference between the front and the back of the condensate main regulating valve is 0.2-0.35MPa after the condensate main regulating valve is modified, the current of the condensate pump is reduced by 20-40A, and the operation condition is normal.
Further carrying out deep frequency conversion, and reducing the lowest rotation speed of the condensate pump to 27HZ/810 rpm.
Further logic optimization is as follows:
(1) the dead zone that the switch point was equipped with 20MW between frequency conversion regulation oxygen-eliminating device water level or the main governing valve regulation oxygen-eliminating device water level:
a) when the furnace side load is larger than 420MW, the water level of the deaerator is adjusted in a frequency conversion mode, and the opening degree of a main adjusting valve is a function of the upper furnace side load;
b) when the load on the furnace side is less than 400MW, the main regulating valve regulates the water level of the deaerator, and the frequency conversion regulates the condensed water pressure;
(2) important fixed value:
a) when the frequency and the pressure are regulated, the set value of the outlet pressure of the condensing pump is 1.15 MPa;
b) when the frequency conversion water level is changed, and the condensed water pressure at the outlet of the fine processing device is lower than 1.15MPa, the frequency conversion rotating speed is forbidden to be reduced;
c) in a fine processing PLC "# 1 machine prefilter parameter setting" picture, the constant value that the system inlet pressure is low and the automatic fine processing quit is 0.8 MPa;
(3) when the variable frequency pump operates, the interlocking of the standby power frequency pump is started:
a) the main control instruction of the boiler is more than 450MW, and the low bypass degree is more than 30%;
b) the pressure of a condensate outlet main pipe (10LCA20CP001) < 1 MPa;
c) and tripping the variable frequency pump.
Through further logic optimization, under extreme working conditions, logic is automatically triggered to meet user requirements, dynamic management of partial parameters of red line pressing operation and subsequent operation is carried out, sufficient operation of the condensate main valve and the condensate bypass valve under medium and low loads is ensured, and the electricity consumption of the condensate pump is reduced to 0.135% at minimum.
Claims (6)
1. A method for optimizing condensation depth frequency conversion of a thermal generator set is characterized by comprising the following steps: comprises the following steps:
(1) the control loop is referred to as the 'main regulating valve opening is a function of the load on the furnace side', so that the main regulating valve does not have the pressure regulating function, and the following table is used for:
comparison table of main regulating valve opening and boiler main control instruction
(2) The dead zone that the switch point was equipped with 20MW between frequency conversion regulation oxygen-eliminating device water level or the main governing valve regulation oxygen-eliminating device water level:
a) when the furnace side load is larger than 530MW, the water level of the deaerator is adjusted in a frequency conversion mode, and the opening degree of a main adjusting valve is a function of the upper furnace side load;
b) when the load on the furnace side is less than 510MW, the main regulating valve regulates the water level of the deaerator, and the condensed water pressure is regulated through frequency conversion;
(3) important fixed value:
when the frequency and the frequency are changed, the set value of the outlet pressure of the condensing pump is 1.7 MPa;
when the frequency conversion water level is changed, and the condensed water pressure at the outlet of the fine processing device is lower than 1.6MPa, the frequency conversion rotating speed is forbidden to be reduced;
in a fine processing PLC "# 1 machine prefilter parameter setting" picture, the constant value that the system inlet pressure is low and the automatic fine processing quit is 1.2 MPa;
(4) when the variable frequency pump operates, the interlocking of the standby power frequency pump is started:
a) the main control instruction of the boiler is more than 450MW, and the low bypass degree is more than 30%;
b) the pressure of an outlet main pipe of the condensing pump is less than 1.5 MPa;
c) tripping the variable frequency pump;
comparison table of main regulating valve opening and boiler main control instruction when power frequency condensate pump is started jointly
(5) The variable frequency pump operates, the standby power frequency pump is started in an interlocking manner, and the auxiliary regulating valve is closed forcibly;
(6) when the main control instruction of the boiler is more than 450MW and the low bypass degree is more than 30%, and the industrial frequency pump is started in an interlocking way, the instruction of the variable frequency pump is increased by 300RPM instantly.
2. The thermal generator set condensation water depth frequency conversion optimization method according to claim 1, which is characterized in that: and setting a manual variable-frequency pump jump alarm.
3. The thermal generator set condensation water depth frequency conversion optimization method according to claim 1 or 2, characterized in that: and setting the logic of a boiler MFT forced closing main adjusting valve and an auxiliary adjusting valve.
4. The thermal generator set condensation water depth frequency conversion optimization method according to claim 1 or 2, characterized in that: the aperture of the condensed water main regulating valve is a 16' pneumatic regulating valve.
5. The thermal generator set condensation water depth frequency conversion optimization method according to claim 1 or 2, characterized in that: further carrying out deep frequency conversion, and reducing the lowest rotation speed of the condensate pump to 27HZ/810 rpm.
6. The thermal generator set condensation water depth frequency conversion optimization method according to claim 1 or 2, characterized in that: further logic optimization is as follows:
(1) the dead zone that the switch point was equipped with 20MW between frequency conversion regulation oxygen-eliminating device water level or the main governing valve regulation oxygen-eliminating device water level:
a) when the furnace side load is larger than 420MW, the water level of the deaerator is adjusted in a frequency conversion mode, and the opening degree of a main adjusting valve is a function of the upper furnace side load;
b) when the load on the furnace side is less than 400MW, the main regulating valve regulates the water level of the deaerator, and the frequency conversion regulates the condensed water pressure;
(2) important fixed value:
a) when the frequency and the pressure are regulated, the set value of the outlet pressure of the condensing pump is 1.15 MPa;
b) when the frequency conversion water level is changed, and the condensed water pressure at the outlet of the fine processing device is lower than 1.15MPa, the frequency conversion rotating speed is forbidden to be reduced;
c) in a fine processing PLC "# 1 machine prefilter parameter setting" picture, the constant value that the system inlet pressure is low and the automatic fine processing quit is 0.8 MPa;
(3) when the variable frequency pump operates, the interlocking of the standby power frequency pump is started:
a) the main control instruction of the boiler is more than 450MW, and the low bypass degree is more than 30%;
b) the pressure of a condensate outlet main pipe (10LCA20CP001) < 1 MPa;
c) and tripping the variable frequency pump.
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Cited By (1)
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