CN204678308U - One is low adds water level and hydrophobic control device - Google Patents
One is low adds water level and hydrophobic control device Download PDFInfo
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- CN204678308U CN204678308U CN201520300487.5U CN201520300487U CN204678308U CN 204678308 U CN204678308 U CN 204678308U CN 201520300487 U CN201520300487 U CN 201520300487U CN 204678308 U CN204678308 U CN 204678308U
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Abstract
The utility model discloses and a kind of lowly add water level and hydrophobic control device, comprise low-pressure heater, also include pneumatic actuator, guide wave radar liquid level gauge, DCS system and intelligent positioner; Described pneumatic actuator is used for controlling hydrophobic valve and opens or closes; Its water level signal for measuring low-pressure heater water level, and is transported to DCS system by described guide wave radar liquid level gauge; The information that described DCS system is transmitted for the treatment of guide wave radar liquid level gauge, and send instruction and be transported to intelligent positioner; Described low-pressure heater connects DCS system by guide wave radar liquid level gauge, and described DCS system controls pneumatic actuator by intelligent positioner, and described pneumatic actuator connects low-pressure heater.Described DCS system comprises AI card, PID controller and AO card, the signal transmission that guide wave radar liquid level gauge is carried by described AI card to PID controller, described PID controller by AO card by intracellular signaling to intelligent positioner.
Description
Technical field
The utility model relates to a kind of automatic control device, more particularly, relates to and a kind of lowly adds water level and hydrophobic control device.
Background technology
So-called fired power generating unit comprises water supply heat back system, and it is the steam doing merit from some intergrade extraction section of steam turbine, sends into heating boiler feed water in bleeder heater, improves the feed temperature of boiler, improves the heat-economy of unit.
Water supply heat back system generally comprises high-pressure heater, oxygen-eliminating device and low-pressure heater.Extracted steam from turbine carries out exchange heat with feedwater and in steam chest, condenses into the water of heat in high-pressure heater, and this area is generally referred to as hydrophobic.
In recent years, the draining system of high-pressure heater generally adopts the mode of flowing automatically step by step, namely utilizes the pressure differential of high-pressure heater, and make hydrophobic step by step from the steam chest flowing into the lower heater of adjacent pressure, the hydrophobic of the high-pressure heater that pressure is minimum flow to oxygen-eliminating device.Adopt mode of flowing automatically step by step, the feedwater that the hydrophobic heating of higher level's high-pressure heater is at the corresponding levels can be made full use of, improve the efficiency of unit.
In Steam Turbine in Fire Power Plant auxiliary system, water level when low-pressure heater runs is very large to the performance of heater and aging effects, this is because the performance indications of low-pressure heater ensure based on ordinary water level.Low-pressure heater must be have water level to run when running, and cannot be in anhydrous for a long time or run lower than under low water line, otherwise except causing that drain temperature is higher, except poor thermal efficiency, also can cause the erosion failure of U-tube.Heater ordinary water level and controlling water level.When heater reach running temperature and stable operation time, must ensure controlling water level, water level indicating gage fixing on low-pressure heater housing can clearly illustrate that this water level.For making heater normally run, need to keep certain water level.
But in reality, certain unit is low adds water level and drainage control system is pneumatic field mounted adjusting apparatus, and exist and measure inaccuracy, the easy malfunction of executing agency, tripping, cause the low water level that adds easily to fluctuate, affect unit safety, economy.Not only bring economic loss to factory, and greatly reduce the operating efficiency of unit.
Utility model content
The technical problems to be solved in the utility model be to provide a kind of rational in infrastructure and unit work can be improved time operating efficiency, in time regulate the low device adding water level.
In order to solve the problem, the utility model embodiment proposes and a kind of lowly adds water level and hydrophobic control device, comprises low-pressure heater, also includes pneumatic actuator, guide wave radar liquid level gauge, DCS system and intelligent positioner;
Described pneumatic actuator is used for controlling hydrophobic valve and opens or closes;
Its water level signal for measuring low-pressure heater water level, and is transported to DCS system by described guide wave radar liquid level gauge;
The information that described DCS system is transmitted for the treatment of guide wave radar liquid level gauge, and send instruction and be transported to intelligent positioner;
The signal control pneumatic actuator that described intelligent positioner transmits for receiving DCS system, pneumatic actuator can also be controlled hydrophobic valve switching value information Quantitative Feedback to DCS system by described intelligent positioner;
Described low-pressure heater connects DCS system by guide wave radar liquid level gauge, and described DCS system controls pneumatic actuator by intelligent positioner, and described pneumatic actuator connects low-pressure heater.
Wherein, low-pressure heater water level variable can be transformed into 4-20MA analog signals by described guide wave radar liquid level gauge, is transported to DCS system.
Wherein, described DCS system comprises AI card, PID controller and AO card, the signal transmission that guide wave radar liquid level gauge is carried by described AI card to PID controller, described PID controller by AO card by intracellular signaling to intelligent positioner.
Wherein, 4-20MA analog signals that guide wave radar liquid level gauge can be sent here by described AI card converts the data signal that PID controller can identify to.
Wherein, PID controller can be sent data signal and convert 4-20MA analog signals that intelligent positioner can identify to by described AO card.
Wherein, described AI card is SM481 analog-digital converter.
Wherein, described AO card is SM520 digital to analog converter.
Wherein, described intelligent positioner adopts SIPATT PS2 series 6DR5020 intelligent electric valve positioner.
Compared with prior art, the beneficial effect of technique scheme of the present utility model is as follows:
In such scheme, transform traditional low level measurement device that adds as guide wave radar liquid level gauge, accurately can measure and lowly add water level, and signal is accessed DCS system; Intelligent positioner is installed additional in executing agency of the present utility model, controls pneumatic actuator action, can realize long-distance intelligent control by DCS system after carrying out logical operation.
Accompanying drawing explanation
Fig. 1 is the low functional-block diagram adding water level and hydrophobic control device of the utility model embodiment.
Description of reference numerals:
1, pneumatic actuator;
2, low-pressure heater;
3, guide wave radar liquid level gauge;
4, DCS system;
41, AI card;
42, PID controller;
43, AO card;
5, intelligent positioner.
Detailed description of the invention
For making the technical problems to be solved in the utility model, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, the utility model proposes and a kind of lowly add water level and hydrophobic control device, comprise low-pressure heater 2, also include pneumatic actuator 1, guide wave radar liquid level gauge 3, DCS system 4 and intelligent positioner 5; Described pneumatic actuator 1 is used for controlling hydrophobic valve and opens or closes; Its water level signal for measuring the water level of low-pressure heater 2, and is transported to DCS system 4 by described guide wave radar liquid level gauge 3; The information that described DCS system 4 is transmitted for the treatment of guide wave radar liquid level gauge 3, and send instruction and be transported to intelligent positioner 5; The signal control pneumatic actuator 1 that described intelligent positioner 5 transmits for receiving DCS system 4, pneumatic actuator 5 can also be controlled hydrophobic valve switching value information Quantitative Feedback to DCS system by described intelligent positioner 5; Described low-pressure heater 2 connects DCS system 4 by guide wave radar liquid level gauge 3, and described DCS system 4 controls pneumatic actuator 1 by intelligent positioner 5, and described pneumatic actuator 1 connects low-pressure heater 2.
Wherein, described DCS system 4 comprises AI card 41, PID controller 42 and AO card 43, the signal transmission that guide wave radar liquid level gauge 3 is carried by described AI card 41 to PID controller 42, described PID controller 42 by AO card 43 by intracellular signaling to intelligent positioner 5.
Particularly, described AI card 41 is SM481 analog-digital converter.
Particularly, described AO card 42 is SM520 digital to analog converter.
Particularly, described intelligent positioner 5 adopts SIPATT PS2 series 6DR5020 intelligent electric valve positioner.
The course of work of the present utility model is as described below:
When this device works, first guide wave radar liquid level gauge 3 detects the height of the water level amount of low-pressure heater 2, and is delivered to DSC system 4;
4-20MA analog signals that guide wave radar liquid level gauge 3 transports by the AI card of DSC system 4 converts the data signal that PID controller can identify to;
At this moment the numerical value that the numerical value of the water level amount of low-pressure heater 2 that preset by operating personnel of DSC system 4 and guide wave radar liquid level gauge 3 are transported compares;
When the numerical value that guide wave radar liquid level gauge 3 transports is less than the numerical value of DSC system 4 setting, DSC system 4 sends signal;
Described DSC system 4 sends signal and converts through AO card 4-20MA analog signals that intelligent positioner 5 can identify to;
After described intelligent positioner 5 Received signal strength, intelligent positioner 5 opens hydrophobic valve by controlling pneumatic actuator 1, the water level of low-pressure heater 2 is increased, so just reaches the object that remote auto controls.
In such scheme, transform traditional low level measurement device that adds as guide wave radar liquid level gauge, accurately can measure and lowly add water level, and signal is accessed DCS system; Intelligent positioner is installed additional in executing agency of the present utility model, controls pneumatic actuator action, can realize long-distance intelligent control by DCS system after carrying out logical operation.
The above is preferred embodiment of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. lowly add water level and a hydrophobic control device, comprise low-pressure heater, it is characterized in that, also include pneumatic actuator, guide wave radar liquid level gauge, DCS system and intelligent positioner;
Described pneumatic actuator is used for controlling hydrophobic valve and opens or closes;
Its water level signal for measuring low-pressure heater water level, and is transported to DCS system by described guide wave radar liquid level gauge;
The information that described DCS system is transmitted for the treatment of guide wave radar liquid level gauge, and send instruction and be transported to intelligent positioner;
The signal control pneumatic actuator that described intelligent positioner transmits for receiving DCS system, pneumatic actuator can also be controlled hydrophobic valve switching value information Quantitative Feedback to DCS system by described intelligent positioner;
Described low-pressure heater connects DCS system by guide wave radar liquid level gauge, and described DCS system controls pneumatic actuator by intelligent positioner, and described pneumatic actuator connects low-pressure heater.
2. according to claim 1ly lowly add water level and hydrophobic control device, it is characterized in that, low-pressure heater water level variable can be transformed into 4-20MA analog signals by described guide wave radar liquid level gauge, is transported to DCS system.
3. according to claim 1ly lowly add water level and hydrophobic control device, it is characterized in that, described DCS system comprises AI card, PID controller and AO card, the signal transmission that guide wave radar liquid level gauge is carried by described AI card to PID controller, described PID controller by AO card by intracellular signaling to intelligent positioner.
4. according to claim 3ly lowly add water level and hydrophobic control device, it is characterized in that, 4-20MA analog signals that guide wave radar liquid level gauge can be sent here by described AI card converts the data signal that PID controller can identify to.
5. according to claim 3ly lowly add water level and hydrophobic control device, it is characterized in that, PID controller can be sent data signal and convert 4-20MA analog signals that intelligent positioner can identify to by described AO card.
6. low according to claim 3 or 4 adds water level and hydrophobic control device, and it is characterized in that, described AI card is SM481 analog-digital converter.
7. low according to claim 3 or 5 adds water level and hydrophobic control device, and it is characterized in that, described AO card is SM520 digital to analog converter.
8. according to claim 1ly lowly add water level and hydrophobic control device, it is characterized in that, described intelligent positioner adopts SIPATT PS2 series 6DR5020 intelligent electric valve positioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520300487.5U CN204678308U (en) | 2015-05-11 | 2015-05-11 | One is low adds water level and hydrophobic control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520300487.5U CN204678308U (en) | 2015-05-11 | 2015-05-11 | One is low adds water level and hydrophobic control device |
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| CN204678308U true CN204678308U (en) | 2015-09-30 |
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| CN201520300487.5U Active CN204678308U (en) | 2015-05-11 | 2015-05-11 | One is low adds water level and hydrophobic control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028277A (en) * | 2018-07-11 | 2018-12-18 | 华北电力大学（保定） | Low-pressure heater water level flexible control method under thermal power plant unit depth peak regulation operating condition |
| CN110940206A (en) * | 2019-12-16 | 2020-03-31 | 广西电网有限责任公司电力科学研究院 | Real-time control system and method for end difference of low-pressure heater with drainage cooling area |
-
2015
- 2015-05-11 CN CN201520300487.5U patent/CN204678308U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028277A (en) * | 2018-07-11 | 2018-12-18 | 华北电力大学（保定） | Low-pressure heater water level flexible control method under thermal power plant unit depth peak regulation operating condition |
| CN109028277B (en) * | 2018-07-11 | 2020-11-03 | 华北电力大学（保定） | Flexible control method for water level of low-pressure heater under deep peak regulation working condition of heat supply unit |
| CN110940206A (en) * | 2019-12-16 | 2020-03-31 | 广西电网有限责任公司电力科学研究院 | Real-time control system and method for end difference of low-pressure heater with drainage cooling area |
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