CN204203797U - Oxygen-eliminating device automatic control system - Google Patents
Oxygen-eliminating device automatic control system Download PDFInfo
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- CN204203797U CN204203797U CN201420489337.9U CN201420489337U CN204203797U CN 204203797 U CN204203797 U CN 204203797U CN 201420489337 U CN201420489337 U CN 201420489337U CN 204203797 U CN204203797 U CN 204203797U
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- steam
- oxygen
- solenoid valve
- eliminating device
- temperature sensor
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Abstract
The utility model discloses a kind of oxygen-eliminating device automatic control system, comprise PLC, input end electrical connection cooling-water temperature sensor, steam temperature sensor and the hydraulic pressure sensor of described PLC, the output terminal electrical connection of PLC controls boiler water solenoid valve, steam regulating valve and steam discharge solenoid valve.PLC accepts cooling-water temperature sensor, steam temperature sensor and hydraulic pressure sensor and signal detected, discriminatory analysis output regulation signal, controls the size and Orientation of boiler water solenoid valve, steam regulating valve and steam discharge solenoid valve, to keep temperature stabilization, remain on 104 ± 1 DEG C, lower oxygen-eliminating device concussion, noise-decreasing, initial steam pressure is stablized, and avoids pressure reduction excessive, and temperature is unstable, to feedwater heat control valve impact etc., thermofor pressure stability, effectively energy-conservation, ensure heat power equipment safety, stable operation.
Description
Technical field
The utility model belongs to boiler accessory machinery control technology field, specifically a kind of automatic control system of oxygen-eliminating device.
Background technology
Oxygen-eliminating device plays an important role in industrial processes, is related to the safe operation of steam generator system, so people have used thousand and one way to control oxygen-eliminating device.At present, industrial more be adopt the pressure controlling the oxygen-eliminating device vapor space to reach to control the object that feedwater is heated to saturation temperature.Even if oxygen-eliminating device pressure reaches the corresponding temperature of 0.02Mpa 104 DEG C. but reality has hysteresis effect due to Single-loop Fuzzy controller PID controlled pressure, make oxygen-eliminating device pressure extremely unstable, when pressure is less than 0.02Mpa, water temperature does not reach 104 DEG C, does not play deaerating effect; Pressure is excessive, and the thermal capacity started due to deoxygenation water tank is large, and the temperature of water can not rise, thus make water enter unsaturation state, the corresponding increase of oxygen level in water, subsequently because oxygen-eliminating device exhausr port aperture is according to rated pressure adjustment, can not change in operation, when lengthy pressure is higher than rated pressure, air capacity is inevitable very large, and this just causes extra loss of steam and water and thermal loss, and feed pump also can be caused to be cavitated, cannot boiler feed water be given, have potential safety hazard.
Its utility model 2012220372978 of up-to-date announcement, proposes a kind of oxygen-eliminating device temperature control system, uses deaerator storage tank internal temperature sensor, and fuzzy controller controls oxygen-eliminating device inlet adjusting valve opening size, since reach deoxygenation object.Because before variable valve, vapor pressure is excessive, admission fast and Single-loop Fuzzy controller PID control to relatively lag behind, thus cause thermofor water temperature at 104 ± 8 DEG C, temperature is too low does not remove oxygen, and temperature is too high, and feed pump easily cavitates, feed pump cannot give boiler feed water, has potential safety hazard.In addition, before and after variable valve, pressure reduction is excessive, also causes variable valve easily to damage.
In order to ensure deaerating effect, thermal deaerator must possess two conditions: the first, water must be heated to temperature corresponding to oxygen-eliminating device pressure; The second, the gas being separated spilling in water must be discharged in time.First condition does not possess, and gas can not all be separated from water; When second condition does not possess, the gas separated can come back in water.
The utility model can overcome the above problems, and can meet above two conditions, oxygen-eliminating device water temperature can be made to reach 104 ± 1 DEG C, reach deoxygenation object, ensures the stable operation of heat power equipment safety economy.
Utility model content
In order to solve prior art Problems existing, the utility model provides a kind of oxygen-eliminating device automatic control system of deoxygenation stable operation.
In order to realize above object, the technical scheme that the utility model is taked is: a kind of oxygen-eliminating device automatic control system, comprise PLC, input end electrical connection cooling-water temperature sensor, steam temperature sensor and the hydraulic pressure sensor of described PLC, the output terminal electrical connection of PLC controls boiler water solenoid valve, steam regulating valve and steam discharge solenoid valve.
Compared with prior art, the utility model oxygen-eliminating device automatic control system is owing to being provided with PLC, cooling-water temperature sensor is accepted by controller, steam temperature sensor and hydraulic pressure sensor detect signal, discriminatory analysis output regulation signal, control boiler water solenoid valve, the size and Orientation of steam regulating valve and steam discharge solenoid valve, to keep temperature stabilization, remain on 104 ± 1 DEG C, lower oxygen-eliminating device concussion, noise-decreasing, initial steam pressure is stablized, avoid pressure reduction excessive, temperature is unstable, to feedwater heat control valve impact etc., thermofor pressure stability, effectively energy-conservation, ensure heat power equipment safety, stable operation.
Accompanying drawing explanation
Fig. 1 is the block scheme of oxygen-eliminating device automatic control system.
Fig. 2 is the structural representation of oxygen-eliminating device.
Embodiment
As shown in Figure 1, oxygen-eliminating device automatic control system comprises water temperature control loop, control of steam temperature loop and hydraulic pressure control loop.Cooling-water temperature sensor, steam temperature sensor and hydraulic pressure sensor access PLC respectively, and PLC controls boiler water solenoid valve, steam regulating valve and steam discharge solenoid valve.
Deoxygenation 1 layout steam temperature sensor 8 and a steam discharge solenoid valve 7 of oxygen-eliminating device, the water tank 2 of oxygen-eliminating device arranges cooling-water temperature sensor 3 and hydraulic pressure sensor 4.The boiler water import of water tank 2 arranges boiler water solenoid valve 5.The steam inlet of deoxygenation 2 arranges steam regulating valve 6.
The utility model is a kind of controlled system with self-regulation to the deoxygenation of steam boiler oxygen-eliminating device, and oxygen-eliminating device water temperature can be made to reach 104 ± 1 DEG C, and deoxygenation reaches optimum efficiency.This control system is made up of water temperature control loop, control of steam temperature loop and hydraulic pressure control loop, and its device is made up of controller PLC, temperature sensor, pressure transducer, steam regulating valve, boiler water solenoid valve, steam discharge solenoid valve and reduction valve.
Water temperature control loop: be control admission boiler water solenoid valve bottom oxygen-eliminating device with thermofor cooling-water temperature sensor.First take thermofor water temperature sensor signal and setting value (namely 104 DEG C) to carry out com-parison and analysis computing at controller PLC, judge solenoid valve whether action, make water temperature arrive setting value.
Control of steam temperature loop: be control oxygen-eliminating device upper steam variable valve with thermofor upper end throttle (steam) temperature sensor.First take air-temperature sensor signal to compare analysis to controller PLC and temperature desired temperature (namely 104 DEG C), judge that output signal size direction is to steam regulating valve, makes waterborne of thermofor keep 104 DEG C.
Hydraulic pressure control loop: be control oxygen-eliminating device upper end steam drain steam discharge solenoid valve with thermofor hydraulic pressure sensor.First take thermofor hydraulic pressure sensor signal and setting value (generally arranging 0.06) to carry out com-parison and analysis computing at controller PLC, judge solenoid valve whether action, discharge the steam overflowed in water in time, make hydraulic pressure remain on 0.02Mpa.
Water temperature control loop and control of steam temperature loop achieve and water must be heated to temperature corresponding to oxygen-eliminating device pressure, and hydraulic pressure control loop achieves timely exhaust steam, ensure deaerating effect.
In addition, thermofor initial steam pressure is from boiler cylinders, so thermofor initial steam pressure is far longer than the pressure in thermofor, can make like this admission and thermofor water slug excessive, cannot allow temperature stabilization, and have concussion and noise greatly, make thermofor be in concussion state, variable valve is fragile, has potential safety hazard.In order to address this problem, before admission solenoid valve and variable valve, a stable reduction valve must be installed, make initial steam pressure keep about 0.2Mpa.
Claims (1)
1. an oxygen-eliminating device automatic control system, comprise PLC, it is characterized in that: input end electrical connection cooling-water temperature sensor, steam temperature sensor and the hydraulic pressure sensor of described PLC, the output terminal electrical connection of PLC controls boiler water solenoid valve, steam regulating valve and steam discharge solenoid valve;
Described steam temperature sensor and steam discharge solenoid valve are arranged in the deoxygenation head of oxygen-eliminating device, described cooling-water temperature sensor and hydraulic pressure sensor are arranged in the water tank of oxygen-eliminating device, boiler water solenoid valve is arranged at the boiler water import of water tank, and steam regulating valve is arranged at the steam inlet of deoxygenation head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420489337.9U CN204203797U (en) | 2014-08-27 | 2014-08-27 | Oxygen-eliminating device automatic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420489337.9U CN204203797U (en) | 2014-08-27 | 2014-08-27 | Oxygen-eliminating device automatic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204203797U true CN204203797U (en) | 2015-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420489337.9U Expired - Fee Related CN204203797U (en) | 2014-08-27 | 2014-08-27 | Oxygen-eliminating device automatic control system |
Country Status (1)
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| CN (1) | CN204203797U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180147A (en) * | 2015-10-27 | 2015-12-23 | 张荣斌 | Deoxidizing equipment for thermal power unit of thermal power plant |
| CN105198027A (en) * | 2015-10-27 | 2015-12-30 | 张荣斌 | 300 MW thermal power generating unit rotating-film deoxygenation system |
| CN107143842A (en) * | 2017-06-29 | 2017-09-08 | 大唐贵州兴仁发电有限公司 | A kind of high-pressure heater quick start system |
| CN109931583A (en) * | 2017-12-18 | 2019-06-25 | 贵州中烟工业有限责任公司 | A kind of constant pressure oxygen-eliminating device and its control system |
| CN113528258A (en) * | 2021-08-24 | 2021-10-22 | 燕京啤酒(玉林)有限公司 | Pressure control system of boiling pot |
-
2014
- 2014-08-27 CN CN201420489337.9U patent/CN204203797U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180147A (en) * | 2015-10-27 | 2015-12-23 | 张荣斌 | Deoxidizing equipment for thermal power unit of thermal power plant |
| CN105198027A (en) * | 2015-10-27 | 2015-12-30 | 张荣斌 | 300 MW thermal power generating unit rotating-film deoxygenation system |
| CN107143842A (en) * | 2017-06-29 | 2017-09-08 | 大唐贵州兴仁发电有限公司 | A kind of high-pressure heater quick start system |
| CN109931583A (en) * | 2017-12-18 | 2019-06-25 | 贵州中烟工业有限责任公司 | A kind of constant pressure oxygen-eliminating device and its control system |
| CN113528258A (en) * | 2021-08-24 | 2021-10-22 | 燕京啤酒(玉林)有限公司 | Pressure control system of boiling pot |
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Legal Events
| 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: 20150311 Termination date: 20190827 |
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| CF01 | Termination of patent right due to non-payment of annual fee |