CN202546731U - Energy-saving device of industrial boiler water feeding system and controlling method of energy-saving device - Google Patents
Energy-saving device of industrial boiler water feeding system and controlling method of energy-saving device Download PDFInfo
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- CN202546731U CN202546731U CN2012201352269U CN201220135226U CN202546731U CN 202546731 U CN202546731 U CN 202546731U CN 2012201352269 U CN2012201352269 U CN 2012201352269U CN 201220135226 U CN201220135226 U CN 201220135226U CN 202546731 U CN202546731 U CN 202546731U
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- 238000000034 method Methods 0.000 title abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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Abstract
The utility model relates to an energy-saving device of an industrial boiler water feeding system and a controlling method of the energy-saving device, and belongs to the field of automation control. A transducer of the energy-saving device is connected with a water feeding pump, an electrically operated valve and a flow meter are arranged on an output pipeline in sequence and in connected mode, and the output pipeline is arranged between the water feeding pump and a coal economizer. A water feeding pressure transmitter is connected between the water feeding pump and the electrically operated valve, and a boiler drum is connected with a programmable logic controller (PLC) through a steam pressure transmitter. The flow meter and the water feeding pressure transmitter are connected with input ends of the PLC, and the transducer and the electrically operated valve are connected with signal output ends of the PLC. A boiler water feeding loop controlling software is installed in the PLC. The controlling method utilizes frequency conversion and valve conversion to jointly adjust to optimally control boiler water feeding, so that the purpose of maximum saving energy is achieved. Meanwhile, abrasion of flow process equipment is reduced greatly, and the service life of the flow process equipment can be prolonged.
Description
Technical field
The utility model relates to the energy saver and the control method thereof of a kind of industrial boiler water-supply system, belongs to automation field.
Background technology
Industrial Boiler generally adopts feed pump to supply water, and the power of feed pump does not wait from tens of kilowatts to hundreds of kilowatts, and the energy consumption of the big more water supply system of boiler capacity is high more.The main method of the discharge of industrial boiler water-supply system control at present is to control through the aperture of control motor-driven valve.Frequency converter has been installed by the industrial boiler water-supply system that has on feed pump, but the control target of frequency converter only is to stablize feed pressure, does not have fully to excavate the energy-saving potential of frequency converter.Though what have has installed motor-driven valve and frequency converter simultaneously, do not give full play to the combined optimization control action of motor-driven valve and frequency converter, still with frequency converter as constant voltage, motor-driven valve is not realized energy-conservation as flow-control better.Because the relation that the energy consumption of feed pump becomes with the rotating speed of feed pump square, so the rotating speed that under the prerequisite of guaranteeing water supply system safety, as far as possible reduces feed pump is energy-conservation key measure.Must keep enough pressure differentials (it is poor that vapour pressure is called for short in the back) just can guarantee boiler feed water between feedwater and the drum; Particularly when the boiler working condition variation needs less discharge; Should beg to surrender low speed of feedwater and reduce flow to require to improve rotating speed poor to keep enough vapour pressures; This just causes the big ups and downs of water supply system, and is not only dangerous but also waste of energy is serious, need control from frequency converter and motor-driven valve two aspects.
The vapour pressure difference can be regulated through frequency converter and these two equipment of motor-driven valve, and big more in the same more little water pressure difference of speed conditions lower valve aperture, the high hydraulic pressure difference is big more more for rotating speed under same valve opening condition, otherwise still.The more little water loss of energy that causes more easily of valve opening.Facts have proved that keep the spent electric energy of enough vapour pressure differences than big through changing the spent electric energy of valve opening through frequency converter fully, hour waste of electric energy is particularly serious at feedwater flow.Therefore need between frequency converter output quantity and valve opening, seek an optimum engagement point, to reach more obvious energy-saving effect.
The utility model content
In view of the problem and shortage of above-mentioned existence, the utility model provides the energy saver and the control method thereof of a kind of industrial boiler water-supply system, adopts frequency conversion and becomes valve and unite the way optimal control boiler feedwater of adjusting, reaches purpose of energy saving to greatest extent; Reduce simultaneously the wearing and tearing of flow sheet equipment greatly, can prolong the service life of flow sheet equipment.
The technical scheme that the utility model adopts is: energy saver hardware comprises frequency converter 3, feed pressure transmitter 5, steam pressure transmitter 7, motor-driven valve 9, flowmeter 10 and Programmable Logic Controller 11; Frequency converter 3 connects the control end of feed pump 4; Motor-driven valve 9, flowmeter 10 are installed on the output channel of feed pump 4 to economizer 16 successively; Connect between feed pump 4 and the motor-driven valve 9 feed pressure transmitter 5 is installed; Boiler-steam dome 8 is connected with Programmable Logic Controller 11 through steam pressure transmitter 7, and flowmeter 10 is connected with Programmable Logic Controller 11 inputs with feed pressure transmitter 5, and frequency converter 3 is connected with Programmable Logic Controller 11 output signal ends with motor-driven valve 9.
Boiler feedwater control loop software is installed in the Programmable Logic Controller, and software comprises comparator 1, increment type PID controller 2 and self-optimizing control device 6, and self-optimizing control device 6 comprises analyzes comparator 12, selector switch 13, control table 14 and searcher 15; Comparator 1 is connected in series through increment type PID controller 2 and frequency converter 3, feed pump 4, motor-driven valve 9, boiler-steam dome 8 successively; The flow meter signal input comparator 1 of feedwater flow set-point SP and motor-driven valve output; The analysis comparator 12 of feedwater flow set-point, feed pressure signal, steam pressure signal input self-optimizing control device 6; The output port of analyzing comparator 12 is connected with selector switch 13; The output port of selector switch 13 is connection control list 14 and searcher 15 respectively, and the output port of control table 14 and searcher 15 is connected motor-driven valve 9 respectively.
The beneficial effect of the utility model is that employing frequency conversion and change valve are united the way optimal control boiler feedwater of adjusting, reach purpose of energy saving to greatest extent; The wearing and tearing of flow sheet equipment can be reduced greatly, the service life of flow sheet equipment can be prolonged.
Description of drawings
Fig. 1 is the energy saver structural representation of the utility model;
Fig. 2 is the control principle sketch map of the utility model;
Fig. 3 is the self-optimizing control device schematic diagram of the utility model.
Among the figure: 1-comparator, 2-increment type PID controller, 3-frequency converter, 4-feed pump, 5-feed pressure transmitter, 6-self-optimizing control device, 7-steam pressure transmitter, 8-boiler-steam dome, 9-motor-driven valve, 10-flowmeter, 11-Programmable Logic Controller, 12-analyze comparator, 13-selector switch, 14-control table, 15-searcher, 16-economizer.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described further.
As shown in Figure 1; Energy saver hardware comprises frequency converter 3, feed pressure transmitter 5, steam pressure transmitter 7, motor-driven valve 9, flowmeter 10 and Programmable Logic Controller 11; Frequency converter 3 connects the control end of feed pump 4; Motor-driven valve 9, flowmeter 10 are installed on the output channel of feed pump 4 to economizer 16 successively, are connect between feed pump 4 and the motor-driven valve 9 feed pressure transmitter 5 is installed, boiler-steam dome 8 is connected with Programmable Logic Controller 11 through steam pressure transmitter 7; Flowmeter 10 is connected with Programmable Logic Controller 11 inputs with feed pressure transmitter 5, and frequency converter 3 is connected with Programmable Logic Controller 11 output signal ends with motor-driven valve 9.
Boiler feedwater control loop software is installed in the Programmable Logic Controller, and software comprises comparator 1, increment type PID controller 2 and self-optimizing control device 6, and self-optimizing control device 6 comprises analyzes comparator 12, selector switch 13, control table 14 and searcher 15; Comparator 1 is connected in series through increment type PID controller 2 and frequency converter 3, feed pump 4, motor-driven valve 9, boiler-steam dome 8 successively; The flow meter signal input comparator 1 of feedwater flow set-point SP and motor-driven valve output; The analysis comparator 12 of feedwater flow set-point, feed pressure signal, steam pressure signal input self-optimizing control device 6; The output port of analyzing comparator 12 is connected with selector switch 13; The output port of selector switch 13 is connection control list 14 and searcher 15 respectively, and the output port of control table 14 and searcher 15 is connected motor-driven valve 9 respectively.
In conjunction with Fig. 2 the control method of self-optimizing control device is further described,
After the hyphen device, carry out according to following step;
The first step: the measured value of discharge set-point SP and flowmeter is input comparator simultaneously, compares through comparator, and difference (SP-PV) is sent into the increment type PID controller;
Second step: the increment type PID controller outputs to frequency converter through calculating with the result, through frequency converter feed pump is controlled, and feedwater flow is controlled in the feedwater flow set-point scope;
The 3rd step: feed pressure P1, steam pressure P2, discharge set-point SP send into the analysis comparator in the self-optimizing control device, after signal analysis, select control table or searcher to control;
The control method of control table 14 is: the control algolithm according to feedwater flow, vapour pressure difference situation control and regulation valve opening is: at first draw the control aperture of control valve by the variation of the set-point of feedwater flow through lookup table mode, the feedwater flow measurement category is divided into { 0,1,2; 3,4,5,6; 7 } eight fuzzy grades, correspondence { 0,1,2 respectively; 3,4,6,8; 10 } eight valve opening grades are confirmed the fuzzy grade that it belongs to according to the feedwater flow set-point again, obtain the coarse adjustment value of valve opening according to corresponding relation, revise according to feedwater and drum pressure difference then; When vapour pressure difference during less than 0.15MPa, valve opening is turned down a grade, when vapour pressure difference during, valve opening is heightened a grade greater than 0.2MPa.
When selecting control table control, control table will obtain the control result according to the numerical value of SP, P1, P2 through tabling look-up; The control result will be through the aperture of Programmable Logic Controller output control motor-driven valve.
After feedwater flow set-point SP, feed pressure P1, steam pressure P2 send into and analyze comparator 12; When feedwater flow set-point amplitude of variation greater than 4t/h or pressure differential amplitude of variation during greater than 0.2MPa; Data comparison and data variation trend analysis are confirmed to select that a kind of control algolithm through front and back, and select through selector switch 13, select control table 14 to control; So that make the control system get into stable and comparatively energy-conservation state fast
After the hyphen device, carry out according to following step;
The first step: the measured value of discharge set-point SP and flowmeter is input comparator simultaneously, compares through comparator, and difference (SP-PV) is sent into the increment type PID controller;
Second step: the increment type PID controller outputs to frequency converter through calculating with the result, through frequency converter feed pump is controlled, and feedwater flow is controlled in the feedwater flow set-point scope;
The 3rd step: feed pressure P1, steam pressure P2, discharge set-point SP send into the analysis comparator in the self-optimizing control device, after signal analysis, select control table or searcher to control,
The control method of searcher 15 is: when the feedwater flow set-point change exceed rate range and adopt control table 14 to obtain comparatively rationally valve opening fast after, automatically switch to searcher 15 control modes of seeking the optimum valve aperture, the searching method of optimum valve aperture is: pressure differential is divided into { 0,0.05; 0.15,0.2,0.3 } and five grades, the corresponding search step-length is { 10; 5,1,2,5 }; Pressure differential is during less than 0.15MPa, and with per 10 seconds valve-offs of corresponding step-size in search 1 time, pressure differential is during greater than 0.2MPa; Opened valve 1 time in per 10 seconds with corresponding step-size in search,, suspend search when pressure differential is in 0.15 between 0.20MPa the time.
When selecting searcher, searcher will obtain the control result through progressively searching for according to the numerical value of SP, P1, P2, and the control result will control the aperture of motor-driven valve through Programmable Logic Controller output.
After feedwater flow set-point SP, feed pressure P1, steam pressure P2 send into and analyze comparator 12; When feedwater flow set-point amplitude of variation less than 4t/h and pressure differential amplitude of variation during less than 0.2MPa; Data comparison and data variation trend analysis confirm to select that a kind of control algolithm through front and back; And select through selector switch 13, select searcher 15 to control to seek best valve opening and frequency converter output quantity, the realization considerable energy saving.
The utility model describes through the practical implementation process; Under the situation that does not break away from the utility model scope; Can also carry out various conversion and be equal to replacement utility model; Therefore, the utility model is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the utility model claim scope.
Claims (2)
1. the energy saver of an industrial boiler water-supply system; It is characterized in that: energy saver comprises frequency converter, feed pressure transmitter, steam pressure transmitter, motor-driven valve, flowmeter and Programmable Logic Controller; Frequency converter connects feed pump; On the output channel between feed pump and the economizer, be connected motor-driven valve, flowmeter successively, be connected to the feed pressure transmitter between feed pump and the motor-driven valve, boiler-steam dome is connected with Programmable Logic Controller through the steam pressure transmitter; Flowmeter is connected with the Programmable Logic Controller input with the feed pressure transmitter, and frequency converter is connected with the Programmable Logic Controller output signal end with motor-driven valve.
2. the energy saver of a kind of industrial boiler water-supply according to claim 1 system; It is characterized in that: boiler feedwater control loop software is installed in the Programmable Logic Controller; Software comprises comparator, increment type PID controller and self-optimizing control device, and the self-optimizing control device comprises analyzes comparator, selector switch, control table and searcher; Comparator, increment type PID controller, frequency converter, feed pump, motor-driven valve, boiler-steam dome are connected in series successively in the control loop; The flow meter signal input comparator of feedwater flow set-point SP and motor-driven valve output; The analysis comparator of feedwater flow set-point, feed pressure signal, steam pressure signal input self-optimizing control device; The output port of analyzing comparator is connected with selector switch; The output port of selector switch is connection control list and searcher respectively, and the output port of control table and searcher is connected with motor-driven valve respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201352269U CN202546731U (en) | 2012-04-01 | 2012-04-01 | Energy-saving device of industrial boiler water feeding system and controlling method of energy-saving device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201352269U CN202546731U (en) | 2012-04-01 | 2012-04-01 | Energy-saving device of industrial boiler water feeding system and controlling method of energy-saving device |
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| CN202546731U true CN202546731U (en) | 2012-11-21 |
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| CN2012201352269U Expired - Fee Related CN202546731U (en) | 2012-04-01 | 2012-04-01 | Energy-saving device of industrial boiler water feeding system and controlling method of energy-saving device |
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Cited By (2)
| 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 |
| CN110469839A (en) * | 2019-08-28 | 2019-11-19 | 南京市晨枭软件技术有限公司 | A kind of energy saver and its control for industrial boiler water-supply control loop software |
-
2012
- 2012-04-01 CN CN2012201352269U patent/CN202546731U/en not_active Expired - Fee Related
Cited By (3)
| 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 |
| CN110469839A (en) * | 2019-08-28 | 2019-11-19 | 南京市晨枭软件技术有限公司 | A kind of energy saver and its control for industrial boiler water-supply control loop software |
| CN110469839B (en) * | 2019-08-28 | 2020-10-02 | 南京市晨枭软件技术有限公司 | Energy-saving device for industrial boiler water supply control loop software |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20150401 |
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| EXPY | Termination of patent right or utility model |