CN201671667U - Turbine hot well water level control device - Google Patents
Turbine hot well water level control device Download PDFInfo
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- CN201671667U CN201671667U CN2010201899784U CN201020189978U CN201671667U CN 201671667 U CN201671667 U CN 201671667U CN 2010201899784 U CN2010201899784 U CN 2010201899784U CN 201020189978 U CN201020189978 U CN 201020189978U CN 201671667 U CN201671667 U CN 201671667U
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- water level
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Abstract
An embodiment of the utility model discloses a turbine hot well water level control device, which comprises a water level monitor, a PLC and a frequency converter. The water level monitor is arranged inside a turbine hot well; a signal output end of the water level monitor is connected with an input terminal of the PLC; a communication interface of the frequency converter is connected with an output terminal of the PLC; an input end of a main circuit wiring end of the frequency converter is connected with a power-frequency power supply; and an output end of the main circuit wiring end of the frequency converter is connected with a power supply interface of a turbine motor. The PLC defines output frequency of the frequency converter according to water level information inputted by the water level monitor and preset water level information, and provides the output frequency for the frequency converter, so that the frequency converter converts frequency for the power-frequency power supply according to the output frequency. Under the control of the turbine hot well water level control device, the motor and a condensed water pump driven by the motor no longer constantly work under rated power, thereby energy consumption is reduced, abrasion of the motor and the condensed water pump is simultaneously decreased, and the service life of equipment is prolonged.
Description
Technical field
The utility model relates to the steam turbine technology field, relates in particular to a kind of steam turbine water level of thermal well control gear.
Background technique
Steam turbine is the rotary power machinery that the transformation of energy of steam is become mechanical work, main prime mover as generating usefulness, also can directly drive various pumps, blower fan, compressor and propeller for vessels etc., can also utilize the exhaust of steam turbine or middle bleeding to satisfy production and heat supply needs in life.
After steam enters steam turbine, pass through the nozzle and the movable vane of a series of loop configurations successively, the heat energy of steam is converted into the mechanical energy of turbine rotor, steam becomes exhaust steam after doing work in steam turbine, exhaust steam enters condenser by steam-expelling port, be condensed into water in condenser, its volume-diminished is about 30,000 times in condensing into the process of water, thereby forms vacuum in vapour condenser.The water that is condensed into is flowed in the hot well, through condensate pump water of condensation is discharged.The hot well liquid level is lower, can cause the cavitation erosion of condensate pump, influences the working life and the working efficiency of condensate pump; The hot well liquid level is higher, when liquid level is flooded or partly flood bank of condenser pipes, can cause the vapour condenser heat exchange efficiency to descend, cause the vacuum of vapour condenser to descend, condenser vacuum descends can directly influence turbine work efficient, can cause that simultaneously the turbine discharge temperature rises, cause that Steam Turbine Vibration increases.So in the steam turbine operation process, regulate the water level of hot well, make it be in normal position, can not be too high or too low.
Many now employing throttling regulative modes are controlled water level of thermal well, its specific implementation is: the water of condensation in the hot well is discharged by condensate pump, the water of condensation of discharging is sent boiler back under the effect of high-pressure water pump, condensate tank of dehumidifier is set in hot well, when the water of condensation amount of entering of vapour condenser causes water level of thermal well to descend less than the discharge capacity of condensate pump, the water of condensation that condensate pump is discharged is sent into hot well by the modulating valve that is connected with hot well, guarantee that the water level of hot well is in normal range (NR).The power of condensate pump is to match according to the maximum displacement of steam turbine (being the maximum amount of entering of water of condensation), drive water of condensation pump motor and the supporting setting of selected condensate pump, motor is at rated power operation and drive condensate pump and turn round under the rated load state, because steam turbine can not work in maximum steam discharge state all the time, this moment, the amount of entering of condensed water can be controlled the adjustment of rate of water make-up realization to water level of thermal well by modulating valve less than the discharge capacity of condensate pump.
But, in the whole service process, motor and condensate pump run under the rated power all the time, caused a large amount of energy losses in throttling process, and motor and condensate pump long-time running are under the rated load state, increase the weight of the wearing and tearing of motor and condensate pump, reduced service life of equipment.In addition, modulating valve is a kind of throttling arrangement, and when water of condensation was passed through modulating valve, because sectional area reduces, flow velocity strengthened, and static pressure reduces; After flowing through modulating valve, it is big that sectional area becomes, static pressure is replied gradually, but water of condensation has produced the loss of energy in the process of modulating valve of flowing through, can not reach initial static pressure, condensed water is sent into by the high-pressure water pump supercharging in the process of boiler, needed the more merit of high-pressure water pump consumption to carry out supercharging, cause a large amount of energy losses because the water of condensation static pressure reduces.
The model utility content
In view of this, the purpose of this utility model is to provide a kind of steam turbine water level of thermal well control gear, can reduce energy loss, and can reduce the wearing and tearing of motor and condensate pump, prolongs the working life of equipment.
For achieving the above object, the utility model provides following technological scheme:
A kind of steam turbine water level of thermal well control gear comprises: water level monitor, programmable controller (PLC) and frequency variator; Described water level monitor is arranged in the described steam turbine hot well, and its signal output part is connected with the input terminal of described PLC; The communication interface of described frequency variator is connected with the Out let of described PLC, and the input end of the main circuit connection end of described frequency variator is connected with power frequency supply, and the output terminal of described main circuit connection end is connected with the power interface of the motor of described steam turbine; Wherein, the output frequency that described PLC determines described frequency variator according to the water level information and the preset water level information of the input of described water level monitor, and offer frequency variator by its Out let, according to described output frequency power frequency supply is carried out frequency conversion by frequency variator.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, described steam turbine is provided with first motor and second motor, the power interface of described first motor and second motor is connected with the output terminal of described main circuit of converter terminal respectively, and described control gear also comprises: first contactor and second contactor; The coil of described first contactor and second contactor is connected with the Out let of described PLC respectively; The main contact of described first contactor is series between described frequency variator and described first motor; The main contact of described second contactor is series between described frequency variator and described second motor.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, the power interface of described first motor and described second motor further is connected with power frequency supply, and described control gear also comprises: the 3rd contactor and the 4th contactor; The coil of described the 3rd contactor and the 4th contactor is connected with the Out let of described PLC respectively; The main contact of described the 3rd contactor is series between described power frequency supply and described first motor; The main contact of described the 4th contactor is series between described power frequency supply and described second motor.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, further comprise first thermorelay and second thermorelay; The normally closed interlock of described first thermorelay and second thermorelay is connected with the input terminal of described PLC respectively; The thermoelement of described first thermorelay is series between described first motor and described the 3rd main noddle on contactor; The thermoelement of described second thermorelay is series between described second motor and described the 4th main noddle on contactor.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, further comprise first circuit breaker, second circuit breaker and the 3rd circuit breaker; Described first circuit breaker is series between described the 3rd main noddle on contactor and the described power frequency supply; Described second circuit breaker is series between described the 4th main noddle on contactor and the described power frequency supply; Described the 3rd circuit breaker is series between the input end and described power frequency supply of described main circuit of converter terminal.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, further comprise the touch screen that is connected with described PLC.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, further comprise the control knob that is connected with the input terminal of described PLC.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, the communication interface of described frequency variator is connected by shielded cable with the Out let of described PLC.
Preferably, in above-mentioned steam turbine water level of thermal well control gear, described preset water level information is by decentralized control system (DCS) input.
This shows, the beneficial effects of the utility model are: when the amount of entering of the water of condensation of turbine condenser not simultaneously, water level in the hot well can change thereupon, PLC adjusts the rotating speed of motor according to real-time water level of thermal well information, by the water displacement of electric motor driven condensate pump also along with changing, water level of thermal well is controlled in the normal range (NR), under the control of steam turbine water level of thermal well control gear, motor and work in rated power no longer all the time by the condensate pump of its driving, reduced the loss of energy thus, also reduced simultaneously wearing and tearing, prolonged the working life of equipment motor and condensate pump.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment, to do simple introduction to the accompanying drawing of required use among the embodiment below, apparently, accompanying drawing in describing below only is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the disclosed first kind of steam turbine water level of thermal well control gear of the utility model embodiment;
Fig. 2 is the structural representation of the disclosed second kind of steam turbine water level of thermal well control gear of the utility model embodiment;
Fig. 3 is the structural representation of disclosed the third steam turbine water level of thermal well control gear of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technological scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making under the creative work prerequisite, and the every other embodiment who is obtained belongs to the utility model protection domain.
The utility model discloses a kind of steam turbine water level of thermal well control gear, can reduce energy loss, can reduce wearing and tearing simultaneously, prolong the working life of equipment motor and condensate pump.
Referring to Fig. 1, Fig. 1 is the structural representation of the disclosed first kind of steam turbine water level of thermal well control gear of the utility model embodiment.
Comprise: water level monitor 1, PLC2 and frequency variator 3.Wherein, water level monitor 1 is arranged in the hot well of steam turbine, its signal output part is connected with the input terminal of PLC2, the communication interface of frequency variator 3 is connected with the Out let of PLC, input end R, the S of the main circuit connection end of frequency variator 3 is connected with power frequency supply 4 with T, and output terminal U, the V of its main circuit connection end is connected with the power interface of motor with W.
Water level in 1 pair of hot well of water level monitor detects, the water level of thermal well information that detection is obtained transfers among the PLC2 by the signal output part of himself, carry out the PID computing by PLC2 according to the water level information and the preset water level information of water level monitor 1 input, determine the output frequency of frequency variator 3, because the output frequency of frequency variator 3 directly determines the rotating speed of motor, can realize stepless speed regulation to the control of frequency variator 3 output frequencies to motor by PLC2.
When the amount of entering of the water of condensation of turbine condenser not simultaneously, water level in the hot well can change thereupon, PLC2 adjusts the rotating speed of motor according to real-time water level of thermal well information,, also along with changing water level of thermal well is controlled in the normal range (NR) by the water displacement of electric motor driven condensate pump.Under the control of steam turbine water level of thermal well control gear, motor and work in rated power no longer all the time by the condensate pump of its driving, reduced the loss of energy thus, also reduced wearing and tearing simultaneously, prolonged the working life of equipment motor and condensate pump.In addition,, no longer need modulating valve to carry out moisturizing, also avoided the low high-pressure water pump power consumption that brings of water of condensation differential static pressure thus because the adjusting of water level of thermal well is finished by the work of condensate pump fully.
In concrete the enforcement, can in a steam turbine hot well system, dispose many condensate pumps, dispose many accordingly as the condensate pump drive electric motor, supporting condensate pump and motor form a working group, adopt working method by turns between a plurality of working groups, can further prolong the working life of each motor and condensate pump.With the steam turbine hot well system layout first motor M1 and the second motor M2 and the condensate pump that matches is example, and steam turbine water level of thermal well control gear is described.
Referring to Fig. 2, Fig. 2 is the structural representation of the disclosed second kind of steam turbine water level of thermal well control gear of the utility model embodiment.
The first contactor KM1 and the second contactor KM2 are set in steam turbine water level of thermal well control gear, the coil of the coil of the first contactor KM1 and the second contactor KM2 is connected with the Out let of PLC respectively, the main contact of the first contactor KM1 is series between the output terminal of main circuit connection end of the power interface of the first motor M1 and frequency variator 3, and the main contact of the second contactor KM2 is series between the output terminal of main circuit connection end of the power interface of the second motor M2 and frequency variator 3.
Can switch the working state of the first motor M1 and the second motor M2 by the break-make situation that changes the first contactor KM1 and the second contactor KM2.For example, PLC2 is by the coil output useful signal (as output high level signal) of Out let to the first contactor KM1, the coil of the first contactor KM1 get electric after, its main contact changes closed state into by normally open, the connected first motor M1 put in circuit, PLC2 carries out the PID computing according to the water level of thermal well information of water level monitor 1 input with the water level information of presetting, obtain the output frequency of frequency variator 3, and output frequency transferred in the frequency variator 3, frequency variator 3 carries out frequency conversion according to output frequency to power frequency supply 4, power supply after the frequency conversion is as the driving power of the first motor M1, PLC2 passes through the control of the output frequency realization of control frequency variator 3 to the first motor M1 rotating speed, and then water level of thermal well is controlled in the normal range (NR).Behind first motor M1 work certain hour (as month), carry out rotating of working group, this moment, PLC2 stopped the coil output useful signal (as the output low level signal) to the first contactor KM1, the coil losing electricity of the first contactor KM1, its main contact changes normally open into by closed state, the connected first motor M1 excises from circuit, subsequently, PLC2 is to the coil output useful signal (as the output high level signal) of the second contactor KM2, the coil of the second contactor KM2 get electric after, its main contact changes closed state into by normally open, and the second motor M2 put in circuit that is attached thereto is realized the switching of working group thus.
May there be some limit cases in force, for example the displacement of steam turbine is very big, the condensing capacity that forms in hot well thus is also very big, the amount of entering of water of condensation is greater than the specified water displacement of a condensate pump, this moment, the work of a condensate pump can not be controlled in normal range (NR) with water level of thermal well, need two condensate pumps to carry out drain operation simultaneously, wherein a condensate pump works in the power frequency state, and another condensate pump works in frequency conversion state or power frequency state.Driving first motor M1 of condensate pump and the power interface of the second motor M2 needs to be connected with the output terminal and the power frequency supply 4 of frequency variator 3 main circuit connection ends simultaneously, and the working state of two condensate pumps need be adjusted by steam turbine water level of thermal well control gear.
Referring to Fig. 3, Fig. 3 is the structural representation of disclosed the third steam turbine water level of thermal well control gear of the utility model embodiment.
The 3rd contactor KM3 and the 4th contactor KM4 are set in steam turbine water level of thermal well control gear, wherein the coil of the coil of the 3rd contactor KM3 and the 4th contactor KM4 is connected with the Out let of PLC2, the main contact of the 3rd contactor KM3 is series between the power interface of the power frequency supply 4 and the first motor M1, and the main contact of the 4th contactor KM4 is series between the power interface of the power frequency supply 4 and the second motor M2.
The first motor M1 and the second motor M2 be can control by the break-make situation that changes the first contactor KM1, the second contactor KM2, the 3rd contactor KM3 and the 4th contactor KM4, its isolated operation or operation simultaneously made.
Below in conjunction with specific embodiment the control procedure of steam turbine water level of thermal well control gear to the first motor M1 and the second motor M2 described.
At the steam turbine operation initial stage, the selected first motor M1 at first starts, PLC2 is by the coil output useful signal of Out let to the first contactor KM1, the coil of the first contactor KM1 get electric after, its main contact changes closed state into by normally open, the connected first motor M1 put in circuit also runs on the frequency conversion state, PLC2 carries out the PID computing according to the water level of thermal well information of water level monitor 1 input with the water level information of presetting, obtain the output frequency of frequency variator 3, and output frequency transferred in the frequency variator 3, frequency variator 3 carries out frequency conversion according to output frequency to power frequency supply 4, and the power supply after the frequency conversion is as the driving power of the first motor M1.
Displacement increase when steam turbine, the amount of entering of its water of condensation is during greater than the specified water displacement of a condensate pump, control gear need add pump operated, control the first motor M1 and the second motor M2 moves simultaneously, drive connected condensate pump and simultaneously the water of condensation in the hot well is carried out drain operation.At first, PLC2 stops the coil output useful signal to the first contactor KM1, and behind the coil losing electricity of the first contactor KM1, the main contact of the first contactor KM1 changes normally open into by closed state, and the first motor M1 removes from the converting operation state; Then, PLC2 is to the coil of the 3rd contactor KM3 output useful signal, the coil of the 3rd contactor KM3 get electric after, its main contact changes closed state into by normally open, the first motor M1 inserts work frequency circuit and also runs on the power frequency state; Secondly, PLC2 is to the coil output useful signal of the second contactor KM2, the coil of the second contactor KM2 get electric after, its main contact closure, the second motor M2 is access in frequency changer circuit and runs on the frequency conversion state, so far, there are two condensate pumps that the water of condensation in the hot well is carried out drain operation in the turbine system simultaneously, if the first motor M1 runs on the power frequency state, the second motor M2 runs on the frequency conversion state still can not satisfy the draining needs, can also run on the power frequency state by the switching controls second motor M2 to the second contactor KM2 and the 4th contactor KM4, at this moment, two condensate pumps all reach specified water displacement.
When the displacement of steam turbine reduces, when the water of condensation amount of entering in the hot well reduced thereupon, steam turbine water level of thermal well control gear will subtract pump operated.If the first motor M1 and the second motor M2 all run on the power frequency state, can by PLC2 wherein a motor switch to the frequency conversion state from power frequency, another still operates in the power frequency state.Under the ever-reduced state of steam turbine air displacement, the motor frequency that is under the frequency conversion state constantly descends, and after motor frequency drops to less than 1Hz, this motor is excised from circuit, another motor switches to the frequency conversion state from retch power frequency state, has finished the work that subtracts pump this moment.
It should be noted that, the interlocking mutually of the inside " soft contact " of two contactors that the control first motor M1 and the second motor M2 " power frequency-frequency conversion " switch in PLC2, to guarantee reliable switching, prevent that output terminal U, the V of main circuit connection end of frequency variator 2 and W and power frequency supply 4 are short-circuited and damage.
In steam turbine water level of thermal well control gear, circuit breaker and thermorelay can be set, realize being specially protection to control gear with this: between the power interface of power frequency supply 4 and the first motor M1, connect the successively main contact of first circuit breaker, the 3rd contactor KM3 and the thermoelement of first thermorelay; Between the power interface of power frequency supply 4 and the second motor M2, connect the successively main contact of second circuit breaker, the 4th contactor KM4 and the thermoelement of second thermorelay; The 3rd circuit breaker of between the input end of power frequency supply 4 and frequency variator 3 main circuit connection ends, connecting; The normally closed interlock of the normally closed interlock of first thermorelay and second thermorelay is connected with the input terminal of PLC2 respectively.
Circuit breaker is series in the circuit; can automatic shutdown circuit when fault such as serious overload, short circuit and decompression takes place when circuit; protection is connected on electric equipment thereafter effectively; thermorelay utilizes the thermal effect principle of electric current; when the overload that motor can not bear occurring, cut off the power supply of motor, for motor provides overload protection.
In force, for the man-machine interaction that increases steam turbine water level of thermal well control gear can be provided with touch screen, be connected by private cable between PLC and the touch screen, the touch screen key command can be loaded into the control program of PLC2 inside to carry out corresponding operation by private cable.
In steam turbine water level of thermal well control gear, the control knob that is connected with the input terminal of PLC2 can be set, the user realizes the start and stop of the first motor M1 and the second motor M2 are controlled by the operation to control knob.
Between the Out let of the communication interface of frequency variator 3 and PLC2, be connected, can improve the level of noise jamming, reduce in the main circuit forceful electric power signal the interference of communication signal by shielded cable or twisted-pair feeder.
Preset water level information among the PLC can be determined that (Dlstributed Control System DCS) determines also can to pass through decentralized control system by the user by touch screen.DCS is the complicated day by day complex control system of arising at the historic moment that requires along with the continuous rise of the modern large scale industry production automation and process control, it is the product that computer technology, system's control technique, network communications technology and multimedia technology combine, window close friend's man-machine interface and powerful communication function can be provided, it is the sophisticated equipment of complete process control, process management, DCS is connected with PLC by the current signal of 4～20mA, to PLC input preset water level information.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and other embodiments' difference that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make related domain professional and technical personnel can realize or use the utility model.Multiple modification to these embodiments will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to these embodiments shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. a steam turbine water level of thermal well control gear is characterized in that, comprising: water level monitor, programmable controller PLC and frequency variator;
Described water level monitor is arranged in the hot well of described steam turbine, and its signal output part is connected with the input terminal of described PLC;
The communication interface of described frequency variator is connected with the Out let of described PLC, and the input end of the main circuit connection end of described frequency variator is connected with power frequency supply, and the output terminal of described main circuit connection end is connected with the power interface of the motor of described steam turbine;
Wherein, the output frequency that described PLC determines described frequency variator according to the water level information and the preset water level information of described water level monitor input, and offer described frequency variator by described Out let, according to described output frequency described power frequency supply is carried out frequency conversion by described frequency variator.
2. steam turbine water level of thermal well control gear according to claim 1, described steam turbine is provided with first motor and second motor, the power interface of described first motor and second motor is connected with the output terminal of described main circuit of converter terminal respectively, it is characterized in that described control gear also comprises: first contactor and second contactor;
The coil of described first contactor and second contactor is connected with the Out let of described PLC respectively;
The main contact of described first contactor is series between described frequency variator and described first motor;
The main contact of described second contactor is series between described frequency variator and described second motor.
3. steam turbine water level of thermal well control gear according to claim 2, the power interface of described first motor and described second motor further is connected with described power frequency supply, it is characterized in that described control gear also comprises: the 3rd contactor and the 4th contactor;
The coil of described the 3rd contactor and the 4th contactor is connected with the Out let of described PLC respectively;
The main contact of described the 3rd contactor is series between described power frequency supply and described first motor;
The main contact of described the 4th contactor is series between described power frequency supply and described second motor.
4. steam turbine water level of thermal well control gear according to claim 3 is characterized in that, further comprises first thermorelay and second thermorelay;
The normally closed interlock of described first thermorelay and second thermorelay is connected with the input terminal of described PLC respectively;
The thermoelement of described first thermorelay is series between described first motor and described the 3rd main noddle on contactor;
The thermoelement of described second thermorelay is series between described second motor and described the 4th main noddle on contactor.
5. steam turbine water level of thermal well control gear according to claim 4 is characterized in that, further comprises first circuit breaker, second circuit breaker and the 3rd circuit breaker;
Described first circuit breaker is series between described the 3rd main noddle on contactor and the described power frequency supply;
Described second circuit breaker is series between described the 4th main noddle on contactor and the described power frequency supply;
Described the 3rd circuit breaker is series between the input end and described power frequency supply of described main circuit of converter terminal.
6. steam turbine water level of thermal well control gear according to claim 5 is characterized in that, further comprises the touch screen that is connected with described PLC.
7. steam turbine water level of thermal well control gear according to claim 6 is characterized in that, further comprises the control knob that is connected with the input terminal of described PLC.
8. steam turbine water level of thermal well control gear according to claim 1 is characterized in that the communication interface of described frequency variator is connected by shielded cable with the Out let of described PLC.
9. steam turbine water level of thermal well control gear according to claim 1 is characterized in that, described preset water level information is by decentralized control system DCS input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201899784U CN201671667U (en) | 2010-05-14 | 2010-05-14 | Turbine hot well water level control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201899784U CN201671667U (en) | 2010-05-14 | 2010-05-14 | Turbine hot well water level control device |
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| CN201671667U true CN201671667U (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201899784U Expired - Lifetime CN201671667U (en) | 2010-05-14 | 2010-05-14 | Turbine hot well water level control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106547281A (en) * | 2016-10-28 | 2017-03-29 | 河南师范大学 | Condenser hotwell tank level control system |
| CN110456835A (en) * | 2019-08-28 | 2019-11-15 | 西安陕鼓动力股份有限公司 | Condenser hotwell tank level control system |
-
2010
- 2010-05-14 CN CN2010201899784U patent/CN201671667U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106547281A (en) * | 2016-10-28 | 2017-03-29 | 河南师范大学 | Condenser hotwell tank level control system |
| CN106547281B (en) * | 2016-10-28 | 2019-08-23 | 河南师范大学 | Condenser hotwell tank level control system |
| CN110456835A (en) * | 2019-08-28 | 2019-11-15 | 西安陕鼓动力股份有限公司 | Condenser hotwell tank level control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101215 |
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| CX01 | Expiry of patent term |