CN108758608A - Method for determining optimal bus pipe pressure of boiler feed water frequency conversion regulating system - Google Patents
Method for determining optimal bus pipe pressure of boiler feed water frequency conversion regulating system Download PDFInfo
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- CN108758608A CN108758608A CN201810611253.0A CN201810611253A CN108758608A CN 108758608 A CN108758608 A CN 108758608A CN 201810611253 A CN201810611253 A CN 201810611253A CN 108758608 A CN108758608 A CN 108758608A
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- piping pressure
- frequency
- boiler
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 title abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009183 running Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/18—Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps
- F22D5/20—Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps without floats
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention provides a method for determining the optimal pressure of a main pipe of a boiler feed water frequency conversion regulating system, which is used for determining the optimal pressure set value P of the main pipe of the boiler feed water systemZJGo throughThe process is as follows: setting an initial value P of a set value of the pressure of the main pipe0＝kPq(ii) a Operating the boiler water supply regulating system, manually reducing the frequency of the frequency converter, and when the pressure value of the main pipe is reduced to an initial value P0When the frequency of the frequency converter is adjusted, stopping adjusting the frequency of the frequency converter; observing the opening degree of the regulating valve at the moment, and finishing the regulation if the opening degree of the valve is 80-90 percent at the moment; if the valve opening is less than 80%, the initial value P of the set value of the pressure in the main pipe is reduced0If the opening is more than 90%, increasing the initial value P of the set value of the pressure of the main pipe0And ending the adjustment until the opening of the valve is 80-90%; the invention does not rely on simply adjusting the operating frequency of the frequency converter to adjust the water level of the boiler any more, the operating frequency of the frequency converter is adjusted to control the pressure of the water supply main pipe to operate at an optimal value, and under the pressure, the water level of the boiler is finely adjusted and controlled by respective water supply adjusting valves, thereby achieving the effects of saving energy and protecting equipment safety.
Description
Technical field
The present invention relates to energy-saving control technology field, more particularly to a kind of determining boiler feedwater Variable-frequency Regulating System is most preferably female
The method of pipe pressure.
Background technology
Currently, feed pump is the main equipment of the feed water system of boiler, supplied to the boiler of more paired runnings using piping-main scheme
Water ensures that boiler water level operates in normal value by respective feed-regulating valve, and energy waste is serious, equipment damage is frequent；Water supply
Higher position is still operated in, causes to become for more parallel boiler water supply securities of guarantee, main-piping pressure after pump frequency conversion transformation
Frequency device longtime running is in 48.5Hz or more, and there is no energy-saving effects.And frequency converter is run under this operating mode, temperature is high, equipment frequency
Numerous damage.There are many hidden danger for the safety and economic operation of boiler.
Invention content
In order to solve the problems, such as described in background technology, it is best that the present invention provides a kind of determining boiler feedwater Variable-frequency Regulating System
The method of main-piping pressure, no longer simple rely on adjust frequency converter running frequency to adjust boiler water level, adjust frequency converter operation frequency
Rate controls water supply main-piping pressure and is run in optimum value, at this pressure, by respective feed-regulating valve vernier control boiler water level,
Achieve the effect that energy saving and protection equipment safety.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of method of the determining best main-piping pressure of boiler feedwater Variable-frequency Regulating System, the boiler feedwater variable frequency adjustment
The control of system includes two closed loop adjustment processes：The closed loop adjustment process of main-piping pressure-pump variable frequency device, steam water-level-tune
Save the closed loop adjustment process of valve.
Before the closed loop adjustment process of main-piping pressure-pump variable frequency device, it is first determined the best mother of the feed water system of boiler
Pipe pressure setting value PZJ, using it as the pressure set points of the closed-loop regulating system of the frequency converter of main-piping pressure-water pump；It is described true
Determine the best main-piping pressure setting value P of the feed water system of boilerZJThe step of it is as follows：
Step 1: the initial value P of setting main-piping pressure setting value0=kPQ,K takes 1.2-1.3, PqIt is single for drum pressure value
Position MPa；
Step 2: operation boiler feedwater control system, when operation the execution of pump variable frequency device manually adjust process：From power frequency frequency
Rate maximum value runs pump variable frequency device, and adjusting reduces frequency converter frequency, while observing main-piping pressure value, when main-piping pressure value is down to
Initial value P0When, stop adjusting frequency converter frequency；
Step 3: observing the aperture of regulating valve at this time, if valve opening is 80%-90% at this time, adjustment terminates；
Step 4: if valve opening is less than 80%, reduce the initial value P of main-piping pressure setting value0, repeat step 1
To three process；If valve opening is higher than 90%, increase the initial value P of main-piping pressure setting value0, step 1 is repeated to three
Process；Until valve opening is 80%-90%, then adjustment terminates；
Step 5: the main-piping pressure setting value after adjustment is best main-piping pressure setting value PZJ, by input main-piping pressure-
The closed loop adjustment process of pump variable frequency device executes closed loop and adjusts program；
Step 6: adjustment main-piping pressure protection definite value is best main-piping pressure setting value (PZJ- X) MPa, under main-piping pressure
When being down to protection definite value, stand-by pump starts automatically, ensures boiler safety, X is constant, value 0.2-0.7.
Compared with prior art, the beneficial effects of the invention are as follows：
1, after water supply main-piping pressure is set in optimum value, enable frequency converter longtime running in 44Hz, power saving rate reaches
24%.
2, frequency converter operates in the frequency less than 45Hz after being adjusted by this method, since rotating speed reduces, feed pump and motor
Daily maintenance amount all drastically decline, while ensure that frequency converter transport safety and stability.
3, adjustment main-piping pressure protects definite value, ensure that safe and economical boiler is run.
Description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the boiler feedwater control system water pump main circuit diagram of the embodiment of the present invention；
Fig. 3 is the boiler feedwater control system diagram of the embodiment of the present invention.
Specific implementation mode
Specific implementation mode provided by the invention is described in detail below in conjunction with attached drawing.
A kind of method of the determining best main-piping pressure of boiler feedwater Variable-frequency Regulating System, the boiler feedwater variable frequency adjustment
The control of system includes two closed loop adjustment processes：The closed loop adjustment process of main-piping pressure-pump variable frequency device, steam water-level-tune
Save the closed loop adjustment process of valve.
Before the closed loop adjustment process of main-piping pressure-pump variable frequency device, it is first determined the best mother of the feed water system of boiler
Pipe pressure setting value PZJ, using it as the pressure set points of the closed-loop regulating system of the frequency converter of main-piping pressure-water pump；Such as Fig. 1
It is shown, the best main-piping pressure setting value P of the determining feed water system of boilerZJThe step of it is as follows：
Step 1: the initial value P of setting main-piping pressure setting value0=kPQ,K takes 1.2-1.3, and the present embodiment is with k=1.25
For.PqFor drum pressure rated value, units MPa；
Step 2: operation boiler feedwater control system, when operation the execution of pump variable frequency device manually adjust process：From 50 hertz
Pump variable frequency device is run, manually or automatically adjusting reduces frequency converter frequency, while observing main-piping pressure value, when main-piping pressure value drops
To initial value P0When, stop adjusting frequency converter frequency；
See Fig. 2-3, is the boiler water pump feed water control system figure of embodiment.
In Fig. 2, QS1~QS5 and K6 is closed, K1, K4 interlocking, K2, K3 interlocking, K2, K5 interlocking, K5, K6 interlocking, one is given
Pump variable frequency is run, and another feed pump power frequency is spare, and main-piping pressure is reduced to protection definite value automatically starting, to meet safety
Production requirement.
It is the parallel control system figure of two feed water systems of boiler in Fig. 3, two boilers share a set of water supply system (4
Feed pump), every boiler is equipped with a regulating valve.
Step 3: observing the aperture of regulating valve at this time, if valve opening is 80%-90% at this time, adjustment terminates；
Step 4: if valve opening is less than 80%, reduce the initial value P of main-piping pressure setting value0, repeat step 1
To three process；If valve opening is higher than 90%, increase the initial value P of main-piping pressure setting value0, step 1 is repeated to three
Process；Until valve opening is 80%-90%, then adjustment terminates；
Step 5: the main-piping pressure setting value after adjustment is best main-piping pressure setting value PZJ, by input main-piping pressure-
The closed loop adjustment process of pump variable frequency device executes closed loop and adjusts program；
Step 6: adjustment main-piping pressure protection definite value is best main-piping pressure setting value PZJ- 0.5MPa, under main-piping pressure
When being down to protection definite value, stand-by pump starts automatically, ensures boiler safety.
Determine the best main-piping pressure setting value P of the feed water system of boilerZJTheoretical foundation be：
According to the performance characteristic of boiler feed pump, when water supply pump discharge pressure is 1.25 times of drum pressures, feed pump
The boiler amount of water required should be able to be met by providing flow.
The feed water system of boiler is after above-mentioned method has adjusted best main-piping pressure given value, frequency converter running frequency control
Water supply main-piping pressure processed is run in optimum value, at this pressure, passes through feed-regulating valve vernier control boiler water level.
Water supply main-piping pressure after optimum value, enables frequency converter longtime running in 44Hz by the present embodiment process setting,
Power saving rate reaches 24%, and frequency converter operates in 44Hz, since rotating speed reduces, the daily maintenance amount of feed pump and motor all drastically under
Drop, while ensure that frequency converter transports safety and stability.It adjusts main-piping pressure and protects definite value, ensure that safe and economical boiler is run.
Above example is being implemented down based on the technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
It is conventional method not mentionlet alone bright.
Claims (1)
1. a kind of method of the determining best main-piping pressure of boiler feedwater Variable-frequency Regulating System, the boiler feedwater variable frequency adjustment system
The control of system includes two closed loop adjustment processes：The closed loop adjustment process of main-piping pressure-pump variable frequency device, steam water-level-adjusting
The closed loop adjustment process of valve；
It is characterized in that, before the closed loop adjustment process of main-piping pressure-pump variable frequency device, it is first determined the feed water system of boiler
Best main-piping pressure setting value PZJ, using it as the pressure set points of the closed-loop regulating system of the frequency converter of main-piping pressure-water pump；
The best main-piping pressure setting value P of the determining feed water system of boilerZJThe step of it is as follows：
Step 1: the initial value P of setting main-piping pressure setting value0=kPq, k takes 1.2-1.3, PqFor drum pressure value, unit
MPa；
Step 2: operation boiler feedwater control system, when operation the execution of pump variable frequency device manually adjust process：Most from work frequency
Big value operation pump variable frequency device, adjusting reduces frequency converter frequency, while observing main-piping pressure value, when main-piping pressure value is down to initially
Value P0When, stop adjusting frequency converter frequency；
Step 3: observing the aperture of regulating valve at this time, if valve opening is 80%-90% at this time, adjustment terminates；
Step 4: if valve opening is less than 80%, reduce the initial value P of main-piping pressure setting value0, step 1 is repeated to three
Process；If valve opening is higher than 90%, increase the initial value P of main-piping pressure setting value0, repeat the mistake of step 1 to three
Journey；Until valve opening is 80%-90%, then adjustment terminates；
Step 5: the main-piping pressure setting value after adjustment is best main-piping pressure setting value PZJ, by input main-piping pressure-water pump
The closed loop adjustment process of frequency converter executes closed loop and adjusts program；
Step 6: adjustment main-piping pressure protection definite value is best main-piping pressure setting value (PZJ- X) MPa, it is dropped in main-piping pressure
When protecting definite value, stand-by pump starts automatically, ensures boiler safety, X is constant, value 0.2-0.7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810611253.0A CN108758608B (en) | 2018-06-14 | 2018-06-14 | Method for determining optimal bus pipe pressure of boiler feed water frequency conversion regulating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810611253.0A CN108758608B (en) | 2018-06-14 | 2018-06-14 | Method for determining optimal bus pipe pressure of boiler feed water frequency conversion regulating system |
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| CN108758608A true CN108758608A (en) | 2018-11-06 |
| CN108758608B CN108758608B (en) | 2019-08-27 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607012A (en) * | 2012-04-01 | 2012-07-25 | 昆明理工大学 | Energy-saving device and control method for industrial boiler water feeding system |
| JP5350076B2 (en) * | 2009-05-26 | 2013-11-27 | 株式会社日立製作所 | Power plant condensate system controller |
| CN205937081U (en) * | 2016-08-23 | 2017-02-08 | 希望森兰科技股份有限公司 | Variable frequency speed governing(VFSG) is electronic directly to be driven for water pump system |
| CN206160096U (en) * | 2016-10-08 | 2017-05-10 | 广东惠州天然气发电有限公司 | Give pump variable frequency control system based on 9F level gas steam integral unit |
-
2018
- 2018-06-14 CN CN201810611253.0A patent/CN108758608B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5350076B2 (en) * | 2009-05-26 | 2013-11-27 | 株式会社日立製作所 | Power plant condensate system controller |
| CN102607012A (en) * | 2012-04-01 | 2012-07-25 | 昆明理工大学 | Energy-saving device and control method for industrial boiler water feeding system |
| CN205937081U (en) * | 2016-08-23 | 2017-02-08 | 希望森兰科技股份有限公司 | Variable frequency speed governing(VFSG) is electronic directly to be driven for water pump system |
| CN206160096U (en) * | 2016-10-08 | 2017-05-10 | 广东惠州天然气发电有限公司 | Give pump variable frequency control system based on 9F level gas steam integral unit |
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