CN100561043C - A kind of boiler feedwater flow control and pressure compensating system - Google Patents
A kind of boiler feedwater flow control and pressure compensating system Download PDFInfo
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- CN100561043C CN100561043C CNB2008101721632A CN200810172163A CN100561043C CN 100561043 C CN100561043 C CN 100561043C CN B2008101721632 A CNB2008101721632 A CN B2008101721632A CN 200810172163 A CN200810172163 A CN 200810172163A CN 100561043 C CN100561043 C CN 100561043C
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Abstract
The invention provides a kind of boiler feedwater flow control and pressure compensating system, comprise boiler, boiler feed pump and feed pipe; Also comprise prefix flow control pump, be used for the revolution driver and the flow control and pressure compensation adjuster of flow-control; Described revolution driver is electrically connected with the drive motors and the described flow control and pressure compensation adjuster of described prefix flow control pump respectively.Described flow control and pressure compensation adjuster is monitored the adjusting parameter of described boiler feed pump, change the flow of described prefix flow control pump by the rotating speed that changes described revolution driver, and then the lift that changes described prefix flow control pump changes, thereby realizes flow-control and pressure compensation to described boiler feed pump.The prior art water injecting pump departs from efficient district, and efficient reduces, and pollutes electrical network, and can only unidirectionally regulate, and it is stable to ensure to water pressure, invests huge.The present invention realizes the confluent step-less adjustment, and feed pressure is stable, and power consumption reduces, and efficient improves.
Description
Technical field
The present invention relates to the power plant boiler water supply system, relate in particular to the feedwater flow control and the pressure stability system of the feed water system of boiler.
Background technology
Boiler feed pump is the key equipment of power plant steam boiler safe and continuous running.At present, be the safeguards system steady running, feed pump design in power plant all leaves suitable surplus, and the steam boiler in power plant develops to big capacity, and the steam discharge capacity is big, temperature is high, pressure is high, so feed water system of boiler power consumption is bigger.Particularly when power supply, heat supply and other device (as steam turbine) load variations or environmental change (as the summer in winter, round the clock), steam flow and pressure also all change thereupon.Usually the method for this variation of reply is to return stream by valve regulated throttling or feed pump now, realizes regulating.So not only lose part energy extraly, cause very big waste, and this control method can influence the boiler steady running.Now, there are indivedual power plants to drive (more than the 1600Kw) employing big frequency conversion of high pressure (6000V) on the big motor, in the hope of the pressure flow VFC at feed pump.The result of way can make water injecting pump depart from efficient district like this, and efficient reduces, and pollutes electrical network, and can only unidirectionally regulate, and it is stable to ensure to water pressure, invests huge.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of boiler feedwater flow control and pressure compensating system, with realization confluent step-less adjustment, and feed pressure is stable, and power consumption reduces, and efficient improves.
The objective of the invention is to be achieved through the following technical solutions:
A kind of boiler feedwater flow control and pressure compensating system comprise boiler, boiler feed pump and feed pipe; Described boiler links to each other with described boiler feed pump, it is characterized in that:
Also comprise prefix flow control pump, be used for the revolution driver and the flow control and pressure compensation adjuster of flow-control;
Described prefix flow control pump is arranged on before the described boiler feed pump, and the outlet of described prefix flow control pump links to each other with the inlet of described boiler feed pump, and the inlet of described prefix flow control pump links to each other with described feed pipe;
Described revolution driver is electrically connected with the drive motors and the described flow control and pressure compensation adjuster of described prefix flow control pump respectively.
Described flow control and pressure compensation adjuster is monitored the adjusting parameter of described boiler feed pump, change the flow of described prefix flow control pump by the rotating speed that changes described revolution driver, and then the lift that changes described prefix flow control pump changes, thereby realizes flow-control and pressure compensation to described boiler feed pump.
Implement boiler feedwater flow control of the present invention and pressure compensating system, by before boiler feed pump, adding a flow control pump, and to existing boiler feed pump tear open the level or cutting impeller, cut down the consumption of energy, make boiler feed pump and flow control pump flow pressure coupling, it is stepless regulated to reach confluent, the effect that feed pressure is stable, and can make feed pump at efficient district steady operation, raise the efficiency, save the energy.
Description of drawings
The present invention will be further described in detail below in conjunction with drawings and Examples.
Fig. 1 is boiler feedwater flow control according to an embodiment of the invention and pressure compensating system schematic diagram;
Fig. 2 is the boiler feedwater flow control shown in Figure 1 and the performance plot of the boiler feed pump in the pressure compensating system;
Fig. 3 is the boiler feedwater flow control shown in Figure 1 and the performance plot of the prefix flow control pump in the pressure compensating system.
Reference numeral wherein is as follows:
1, boiler
2, boiler feed pump
3, prefix flow control pump
4, revolution driver
5, flow control and pressure compensation adjuster
6, flowmeter
7, return valve
8, pressure transmitter
9, steam-flow meter
The specific embodiment
As shown in Figure 1, in one embodiment of the invention, boiler feedwater flow control and pressure compensating system comprise boiler 1, boiler feed pump 2, prefix flow control pump 3, revolution driver 4, flow control and pressure compensation adjuster 5, flowmeter 6, return valve 7, pressure transmitter 8, steam-flow meter 9 and differential pressure transmitter (not shown).
Boiler feed pump 2 links to each other with boiler 1 by pipeline; Prefix flow control pump 3 is installed in before the boiler feed pump 2, and the outlet of prefix flow control pump 3 is linked to each other by the inlet of pipeline with boiler feed pump 2, and the inlet of prefix flow control pump 3 links to each other with feed pipe by pipeline.Prefix flow control pump 3 is a centrifugal pump.Because two pumps are gone here and there mutually, boiler feed pump 2 outlet pressures are increased, therefore, tear level or cutting transformation open to boiler feed pump 2, two pumpss in series reach coupling, so that meet the requirement of feed pressure value, and cut down the consumption of energy.Good for two pumps coupling, the pump efficiency of prefix flow control pump 3 is than the pump efficiency height of boiler feed pump 2, and the zone is wide.
Revolution driver 4 links to each other by the drive motors of cable with prefix flow control pump 3, thereby by changing the flow that its rotating speed changes described prefix flow control pump, and then change described prefix flow control pump and can compensate the boiler feedwater pump lift and change.Revolution driver 4 can adopt frequency control, also can adopt pulse chopper and magnetic control speed regulator etc., adopts variable-frequency governor in the present embodiment.
Flowmeter 6 can be installed between boiler feed pump 2 and the prefix flow control pump 3 or on the inlet duct of flow control pump 3; Pressure transmitter 8 is installed on the outlet conduit of boiler feed pump 2, and steam-flow meter 9 is installed on the drum outlet conduit of boiler 1.Revolution driver 4, flowmeter 6, steam-flow meter 9, differential pressure transmitter and pressure transmitter 8 link to each other with flow control and pressure compensation adjuster 5 by cable respectively.
Flow control and pressure compensation adjuster 5 is used for monitoring the adjusting parameter of boiler feed pump 2, realizes the adjusting of flow-control and pressure compensation.Flow control and pressure compensation adjuster 5 receives steam water-level signal from differential pressure transmitter, from the feedwater flow signal of flowmeter 6, from the steam flow signal of steam-flow meter 9 with from the feed pressure signal of pressure transmitter 8, control calculating; According to the output signal of flow control and pressure compensation adjuster 5, the rotating speed of corresponding change revolution driver 4, and then the duty of change prefix flow control pump 3 are controlled or are manually controlled thereby the realization closed loop is automatic then.
5 pairs of feedwater flow control actions of revolution driver 4 and flow control and pressure compensation adjuster are to control water-supply valve by output signal in the feedwater three momentum Principles of Regulation of the prior art, have made into by output signal control revolution driver.In this patent feedwater flow, steam flow and three variablees of steam water-level signal are input to flow control and pressure compensation adjuster 5, after computing; The rotating speed that changes revolution driver 4 according to the output signal of flow control and pressure compensation adjuster 5 changes the flow of prefix flow control pump 3.
5 pairs of pressure compensation effects of revolution driver 4 and flow control and pressure compensation adjuster: boiler feed pump 2 is because flow changes, cause its feed pressure to change, by the feed pressure signal is input to flow control and pressure compensation adjuster 5, after comparing; The rotating speed that the output signal of flow control and pressure compensation adjuster 5 changes revolution driver 4 changes the flow of prefix flow control pump 3, has correspondingly changed the lift of prefix flow control pump 3 simultaneously, in order to the variation of the feed pressure of balance boiler feed pump 2.
Flow control and pressure compensation adjuster 5 can adopt WP series, S series, automation control apparatus meter apparatus such as DCS.
Fig. 2 is the performance plot (ordinate initial point H20 is the migration value of boiler feed pump 2 lifts) of boiler feed pump 2;
Fig. 3 is the performance plot of prefix flow control pump 3.Below in conjunction with Fig. 2 and Fig. 3 boiler feedwater flow control of the present invention and pressure compensation process are described:
When the rotating speed of revolution driver 4 is n3,
Boiler feed pump 2 operating points are A, and flow at this moment is QA, and lift is H2A;
The operating point of prefix flow control pump 3 is A ', and flow is QA, and lift is H3A '.
The control action of revolution driver 4 and flow control and pressure compensation adjuster 5, with revolution driver 4 when original rotation speed n 3 becomes n2:
Prefix flow control pump 3 operating points are B ', and flow is increased to QB, and lift rises to H3B '; Boiler feed pump 2 operating points are B, and flow at this moment is increased to QB, and lift drops to H2B.
Because flow is increased to QB from QA, boiler feed pump 2 lift decline H2A-H2B=Δ H2, and this moment is because the control action of flow control and pressure compensation adjuster 5, the lift of prefix flow control pump 3 rises to H3B ' by H3A ', at this moment H3A '-H3B '=-Δ H3, because prefix flow control pump 3 matches with boiler feed pump 2, just therefore Δ H2+ (Δ H3)=0 is compensated.
Return valve 7 is installed on the outlet conduit of boiler feed pump 2, and return valve 7 or in case of emergency guarantees safe operation of the boiler when the start-stop pump.
Claims (5)
1, a kind of boiler feedwater flow control and pressure compensating system comprise boiler (1), boiler feed pump (2), feed pipe, prefix flow control pump (3), the revolution driver (4) that is used for flow-control and flow control and pressure compensation adjuster (5); Wherein, described boiler (1) links to each other with described boiler feed pump (2); Described prefix flow control pump (3) is arranged on described boiler feed pump (2) before, and the outlet of described prefix flow control pump (3) links to each other with the inlet of described boiler feed pump (2), and the inlet of described prefix flow control pump (3) links to each other with described feed pipe; Described revolution driver (4) is electrically connected with the drive motors and the described flow control and pressure compensation adjuster (5) of described prefix flow control pump (3) respectively; It is characterized in that:
Described flow control and pressure compensation adjuster (5) is monitored the adjusting parameter of described boiler feed pump (2), change the flow of described prefix flow control pump (3) by the rotating speed that changes described revolution driver (4), and then the lift that changes described prefix flow control pump (3) changes, thereby realizes flow-control and pressure compensation to described boiler feed pump (2);
When described revolution driver (4) rotating speed was first rotating speed: the flow of described prefix flow control pump (3) was a first flow, and the lift of described boiler feed pump (2) is first lift; The lift of described prefix flow control pump (3) is second lift;
When described revolution driver (4) rotating speed was second rotating speed: the flow of described prefix flow control pump (3) was second flow, and the lift of described boiler feed pump (2) is the 3rd lift; The lift of described prefix flow control pump (3) is the 4th lift;
Wherein, (first lift-the 3rd lift)+(second lift-the 4th lift)=0.
2, feedwater flow control according to claim 1 and pressure compensating system is characterized in that:
Also comprise flowmeter (6), steam-flow meter (9) and differential pressure transmitter; Described flowmeter (6) is arranged between described boiler feed pump (2) and the described prefix flow control pump (3) or on the suction line of prefix flow control pump (3); Described steam-flow meter (9) is arranged on the exit of described boiler (1);
Described flow control and pressure compensation adjuster (5) and described flowmeter (6), described steam-flow meter (9), described differential pressure transmitter are electrically connected,
Described flow control and pressure compensation adjuster (5) is accepted the monitor signal of described flowmeter (6), described steam-flow meter (9) and described differential pressure transmitter, controls calculating; Output signal according to described flow control and pressure compensation adjuster (5) changes the rotating speed of described revolution driver (4), and then changes the duty of described prefix flow control pump (3).
3, feedwater flow control according to claim 1 and 2 and pressure compensating system is characterized in that:
Also comprise pressure transmitter (8), be arranged between described boiler (1) and the described boiler feed pump (2); And be electrically connected with described flow control and pressure compensation adjuster (5),
Described flow control and pressure compensation adjuster (5) is accepted the monitor signal of pressure transmitter (8), compares calculating; Output signal according to described flow control and pressure compensation adjuster (5) changes the rotating speed of described revolution driver (4), and then changes the duty of described prefix flow control pump (3).
4, feedwater flow control according to claim 1 and 2 and pressure compensating system is characterized in that:
The pump efficiency of described prefix flow control pump (3) is than the pump efficiency height of described boiler feed pump (2), and the zone is wide.
5, feedwater flow control according to claim 1 and 2 and pressure compensating system is characterized in that:
Described boiler feed pump (2) is torn open level or cutting transformation, to meet the requirement of feed pressure value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101721632A CN100561043C (en) | 2008-11-12 | 2008-11-12 | A kind of boiler feedwater flow control and pressure compensating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101721632A CN100561043C (en) | 2008-11-12 | 2008-11-12 | A kind of boiler feedwater flow control and pressure compensating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101435572A CN101435572A (en) | 2009-05-20 |
| CN100561043C true CN100561043C (en) | 2009-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2008101721632A Expired - Fee Related CN100561043C (en) | 2008-11-12 | 2008-11-12 | A kind of boiler feedwater flow control and pressure compensating system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033220A (en) * | 2012-12-14 | 2013-04-10 | 安徽蓝德三元智能系统集成有限公司 | Measuring method and device for steam flow of boiler |
| CN103422919B (en) * | 2013-07-19 | 2015-03-11 | 高椿明 | System and method for water spray injection type pulse steam electric power generation |
| CN107355770B (en) * | 2017-06-26 | 2019-04-05 | 华电电力科学研究院 | By steam feed pump to the method for boiler water filling when a kind of Unit Commitment |
| CN110848124B (en) * | 2019-09-30 | 2021-07-16 | 国电浙能宁东发电有限公司 | Automatic switching control method and device for electric pump and steam pump and storage medium |
| CN111794936A (en) * | 2020-08-13 | 2020-10-20 | 刘亚辉 | Method for changing steam feed pump system into full frequency-conversion high-rotation-speed electric feed pump system and brand new logic control system thereof |
| CN114251852A (en) * | 2021-08-24 | 2022-03-29 | 佛山市顺德区美的饮水机制造有限公司 | Instantaneous heating device, control method and control device thereof, water treatment device and medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533337A (en) * | 1993-07-23 | 1996-07-09 | Hitachi, Ltd. | Feed water supply system of power plant |
-
2008
- 2008-11-12 CN CNB2008101721632A patent/CN100561043C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533337A (en) * | 1993-07-23 | 1996-07-09 | Hitachi, Ltd. | Feed water supply system of power plant |
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| CN101435572A (en) | 2009-05-20 |
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