CN106855228A - A kind of anti-dry protection device and method for fuel-oil or fuel-gas boiler - Google Patents
A kind of anti-dry protection device and method for fuel-oil or fuel-gas boiler Download PDFInfo
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- CN106855228A CN106855228A CN201510894888.2A CN201510894888A CN106855228A CN 106855228 A CN106855228 A CN 106855228A CN 201510894888 A CN201510894888 A CN 201510894888A CN 106855228 A CN106855228 A CN 106855228A
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Abstract
It is used for fuel oil the present invention relates to one kind, the anti-dry protection device of gas fired-boiler, its main controller for including controlling boiler operatiopn, main controller control is connected with alarm and actuator, the burner of actuator control connection boiler, water pump and water-suppling electromagnetic valve, it also includes the pressure sensor for measuring saturated vapour pressure in boiler, the first temperature sensor for measuring vapor (steam) temperature in boiler, second temperature sensor and three-temperature sensor for measuring coolant-temperature gage in boiler for measuring flue-gas temperature in boiler flue, pressure sensor output is connected with the pressure signal processor that pressure signal is converted into temperature signal, first, second and three-temperature sensor be connected to a temperature signal processor, pressure signal processor and temperature signal processor are connected with main controller.Present invention also offers a kind of anti-dry guard method for fuel-oil or fuel-gas boiler.This programme can be realized to fuel-oil or fuel-gas boiler accurately anti-dry protection in time.
Description
Technical field
The present invention relates to boiler combustion technology, specifically a kind of anti-dry protection device and method for fuel-oil or fuel-gas boiler.
Background technology
In etesian boiler explosion accident, middle-size and small-size gas-steam boiler accounts for the overwhelming majority, one of the main reasons precisely due to after boiler serious water shortage dry combustion method caused by operating personnel's misoperation.In the explosion accident of these boilers, it is existing operation it is improper the reason for, also have the incomplete reason of equipment.
Using technologies such as similar image furnace flame monitoring systems come prevention and control boiler dry combustion method, for medium small boiler system, cost is prohibitively expensive.By water level regulation and automatic protective system come anti-dry more than existing medium small boiler, wherein, the water level controller used during water level regulation mainly has four kinds of float-ball type, electric pole type, condenser type and temperature induction type.Due to often there is " falsity water level " phenomenon, the reliability of temperature induction type water level controller is higher than other three kinds of water level controllers, and low cost, thus is widely adopted.
But existing temperature induction type water level controller thermometric mode is single, with certain defect.A kind of temperature induction boiler limiting water level automatic alarming protector as disclosed in the Y of CN 2302476; propose to pass through temperature sensor measurement kettle temperature; again the temperature and design temperature are compared to judge water level; in the case that device incrustation scale in the poor stove of water quality is more; inner operating meeting off-design operating mode, predetermined temperature will no longer be applicable and wrong report can be caused to fail to report.A kind of and for example Anti-drying vertical type boiler disclosed in CN 201589253U, propose the change of direct measurement vertical boiler flue top metal temperature, so as to temperature signal to be directly passed to the excess temperature alarm device of outside and is shown, when the temperature of metal surface exceedes certain numerical value, judge that now boiler has been in exsiccosis, but the device is when in use, reference temperature is set according to the condition under rated pressure, and the normal wall temperature of flue changes with steam pressure change in stove, so single wall temperature measurement, lacks the accurate judgement to water shortage accident conditions.
The content of the invention
It is an object of the invention to provide a kind of anti-dry protection device and method for fuel-oil or fuel-gas boiler, its reliability is higher, can realize to fuel-oil or fuel-gas boiler accurately anti-dry protection in time.
Technical scheme is as follows：
One kind is used for fuel oil, the anti-dry protection device of gas fired-boiler, main controller including controlling boiler operatiopn, main controller control is connected with alarm and actuator, the burner of actuator control connection boiler, water pump and water-suppling electromagnetic valve, it also includes the pressure sensor for measuring saturated vapour pressure in boiler, the first temperature sensor for measuring vapor (steam) temperature in boiler, second temperature sensor and three-temperature sensor for measuring coolant-temperature gage in boiler for measuring flue-gas temperature in boiler flue, pressure sensor output is connected with the pressure signal processor that pressure signal is converted into temperature signal, first, second and three-temperature sensor be connected to a temperature signal processor, pressure signal processor and temperature signal processor are connected with main controller.
Further, pressure sensor is arranged on the pipeline of Boiler Steam outlet.
Further, the first temperature sensor and three-temperature sensor are arranged on the pipeline of boiler media outlet.
A kind of anti-dry guard method for fuel-oil or fuel-gas boiler, it comprises the following steps：
Step a：The pressure sensor of saturated vapour pressure in measurement boiler is set, first temperature sensor of vapor (steam) temperature in measurement boiler, the second temperature sensor of flue-gas temperature and the three-temperature sensor for measuring coolant-temperature gage in boiler in measurement boiler flue, the signal output part connection pressure signal processor of pressure sensor, the main controller of pressure signal processor output connection boiler, first, second and three-temperature sensor signal output part connection temperature signal processor, the main controller of temperature signal processor output connection boiler, the setting value of the default triggering alarm of main controller.
Step b：The corresponding temperature value of pressure signal that pressure signal processor calculation pressure sensor is surveyed simultaneously sends temperature value to main controller as steam reference temperature, temperature signal processor is sent to main controller after processing the temperature signal that first, second, and third temperature sensor is surveyed, and the temperature that three-temperature sensor is surveyed is set to hot water reference temperature by main controller.
Step c：Temperature difference between the flue-gas temperature that main controller calculating steam reference temperature and second temperature sensor are surveyed is used as the first temperature difference, the temperature difference that main controller is calculated between the vapor (steam) temperature that steam reference temperature and the first temperature sensor are surveyed is poor as second temperature, and the temperature difference between the flue-gas temperature that main controller calculating hot water reference temperature and second temperature sensor are surveyed is used as the 3rd temperature difference.
Step d：The temperature difference of main controller real-time monitoring first, second, and third with boiler operation time change; when at least one of first, second, and third temperature difference temperature difference gradually increase with run time and not less than triggering alarm setting value when; main controller judges that the running status of now boiler is dry-fire condition; send alarm signal to alarm equipment alarm; and operational order to actuator is sent, actuator controls burner, water pump and the water-suppling electromagnetic valve of boiler to shut down/close.
Further, main controller judges that boiler comprises the following steps as the detailed process of dry-fire condition in step d：
Step d1：Judge whether the first temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then entering step d2.
Step d2：Judge whether second temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then entering step d3.
Step d3：Judge whether the 3rd temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then rebound step d1.
This programme is realized to fuel-oil or fuel-gas boiler accurately anti-dry protection in time; it passes through saturated vapour pressure and is converted into saturated-steam temperature to be used as reference temperature; so that reference temperature changes in time with the change of boiler operatiopn load, the accuracy for therefore referring to temperature is not influenceed by gyp and boiler operatiopn load variations.This programme is also used as reference temperature by measuring the temperature of water in boiler so that reference temperature changes in time with the change of boiler operatiopn load, and the accuracy for therefore referring to temperature is not influenceed by gyp and boiler operatiopn load variations.This programme need not change the original system of boiler, and the measurement point of sensor need to be only set up on Boiler Steam outlet conduit, media outlet pipeline and flue, convenient to implement this programme on the boiler for having run.This programme can individually be implemented; existing water lev el control can be combined again and protection system is implemented; whether it judges boiler in dry-fire condition with using the method real-time and precise that two kinds of temperature differences compare; when the water lev el control and protection system failure that are carried in boiler; safeguard protection can be played a part of; whether accurate control boiler answers timely blowing out, the accident such as blast that effectively prevention is caused due to boiler dry combustion method.
Brief description of the drawings
Fig. 1 is a kind of system construction drawing of anti-dry protection device for fuel-oil or fuel-gas boiler of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment one：
A kind of anti-dry protection device for fuel-oil or fuel-gas boiler, its pressure sensor 1 is used for the saturated vapour pressure tested in boiler, and its second temperature sensor 3 is used to measure the temperature of flue gas in boiler flue.Pressure sensor 1 is set on the pipeline of Boiler Steam outlet and measures pressure signal；The probe segment of second temperature sensor 3 is in data measured signal in flue.The pressure signal that pressure sensor 1 will be measured is sent to pressure signal processor 5, pressure signal processor 5 is according to the one-to-one relationship between saturated vapour pressure and temperature, pressure signal is converted into temperature value, the temperature value is set to steam reference temperature and sends to main controller 7.The temperature signal that second temperature sensor 3 is surveyed is sent to temperature signal processor 6 and carries out data conversion, and the flue-gas temperature after conversion is sent to main controller 7.Main controller 7 carries out logical operation to steam reference temperature and flue-gas temperature, obtain the temperature difference of the two, main controller 7 presets a setting value, gradually increase with the time when this temperature difference and during more than setting value, main controller 7 judges that boiler is in dry-fire condition, sending a signal to alarm 8 carries out being also sent to actuator 9 while low-water alarm, and actuator 9 is immediately to burner, water pump（Small pump, water circulating pump etc.）, water-suppling electromagnetic valve etc. send shutdown/out code, so as to reach anti-dry protection purpose.
Embodiment two：
Main controller 7 judges dry-fire condition by calculating the steam reference temperature in the vapor (steam) temperature in boiler and embodiment one.Pressure sensor 1 and pressure signal processor 5 specifically are set by embodiment one, in addition, it is used to measure the vapor (steam) temperature in boiler using the first temperature sensor 2, first temperature sensor 2 is arranged on the pipeline of boiler media outlet and measures temperature signal, the temperature signal that first temperature sensor 2 is surveyed is sent to temperature signal processor 6 and carries out data conversion, and the vapor (steam) temperature after conversion is sent to main controller 7.Main controller 7 carries out logical operation to steam reference temperature and vapor (steam) temperature, obtains the temperature difference of the two.When boiler is in more serious dry-fire condition, the saturated vapor in boiler can excessively and progressively be changed into superheated steam because of caloric receptivity, and because superheated steam caloric receptivity increases the rising that can cause vapor (steam) temperature, temperature difference now can gradually increase with the time.Main controller 7 presets a setting value, and when temperature difference reaches setting value, main controller 7 judges that boiler is in serious dry-fire condition, and sending a signal to alarm 8 carries out the alarm of serious water shortage, while being also sent to actuator 9, actuator 9 is in time to burner, water pump（Small pump, water circulating pump etc.）, water-suppling electromagnetic valve etc. send shutdown/out code, prevent boiler operator from boiler explosion accident occurring to boiler feed water rashly.
Embodiment three：
Using the water temperature in the measurement boiler of three-temperature sensor 4, three-temperature sensor 4 is arranged on and temperature signal is measured on the pipeline of boiler media outlet, using the temperature of flue gas in the measurement boiler flue of second temperature sensor 3 in embodiment one, temperature signal measured by second temperature sensor 3 and three-temperature sensor 4 carries out data conversion through temperature signal processor 6, and the temperature data after conversion is sent to main controller 7.Temperature value measured by three-temperature sensor 4 carries out logical operation, obtains the temperature difference of the two as hot water reference temperature, main controller 7 is set to hot water reference temperature and flue-gas temperature.When boiler is in dry-fire condition, temperature difference now can gradually increase with the time.Main controller 7 presets a setting value, and when temperature difference reaches setting value, main controller 7 judges that boiler is in dry-fire condition, and sending a signal to alarm 8 carries out low-water alarm, while being also sent to actuator 9, actuator 9 is in time to burner, water pump（Small pump, water circulating pump etc.）, water-suppling electromagnetic valve etc. send shutdown/out code.
Above three embodiment both can individually be implemented, and can be complementary to one another again carries out multiple protective, improve reliability.Such as above three embodiment is combined; carry out triple protection; so main controller 7 can incessantly carry out dry-fire condition judgement in real time by certain priority; if the temperature difference between steam reference temperature and flue-gas temperature is the first temperature difference; if temperature difference between steam reference temperature and vapor (steam) temperature is poor for second temperature; if the temperature difference between hot water reference temperature and flue-gas temperature is the 3rd temperature difference, detailed process can be performed by following three step：
Step d1：Judge whether the first temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then entering step d2.
Step d2：Judge whether second temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then entering step d3.
Step d3：Judge whether the 3rd temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then rebound step d1.
This programme can be applied to individually in production, also, to play a part of multiple protective, can improve reliability as the control of existing normal water level and a supplement of protection device.
Boiler to carrying the sensor group of measurement furnace pressure and temperature, the sensor group that pressure sensor 1, the first temperature sensor 2 and three-temperature sensor 4 in this programme can be carried using boiler is substituted.In normal conditions, above three temperature difference should be 0 DEG C, it is considered to measurement error, it is believed that boiler is in accidental conditions when temperature difference is less than a certain setting value.
Claims (5)
1. a kind of main controller of anti-dry protection device for fuel-oil or fuel-gas boiler, including control boiler operatiopn, main controller control is connected with alarm and actuator, and actuator control connects burner, water pump and the water-suppling electromagnetic valve of boiler, it is characterised in that：Also include for measuring the pressure sensor of saturated vapour pressure in boiler, the first temperature sensor for measuring vapor (steam) temperature in boiler, the second temperature sensor for measuring flue-gas temperature in boiler flue and the three-temperature sensor for measuring coolant-temperature gage in boiler, pressure sensor output is connected with the pressure signal processor that pressure signal is converted into temperature signal, first, second, and third temperature sensor is connected to a temperature signal processor, and pressure signal processor and temperature signal processor are connected with main controller.
2. a kind of anti-dry protection device for fuel-oil or fuel-gas boiler according to claim 1, it is characterised in that：Pressure sensor is arranged on the pipeline of Boiler Steam outlet.
3. a kind of anti-dry protection device for fuel-oil or fuel-gas boiler according to claim 1 and 2, it is characterised in that：First temperature sensor and three-temperature sensor are arranged on the pipeline of boiler media outlet.
4. a kind of anti-dry guard method for fuel-oil or fuel-gas boiler, it is characterised in that：Comprise the following steps：
Step a：The pressure sensor of saturated vapour pressure in measurement boiler is set, first temperature sensor of vapor (steam) temperature in measurement boiler, the second temperature sensor of flue-gas temperature and the three-temperature sensor for measuring coolant-temperature gage in boiler in measurement boiler flue, the signal output part connection pressure signal processor of pressure sensor, the main controller of pressure signal processor output connection boiler, first, second and three-temperature sensor signal output part connection temperature signal processor, the main controller of temperature signal processor output connection boiler, the setting value of the default triggering alarm of main controller；
Step b：The corresponding temperature value of pressure signal that pressure signal processor calculation pressure sensor is surveyed simultaneously sends temperature value to main controller as steam reference temperature, temperature signal processor is sent to main controller after processing the temperature signal that first, second, and third temperature sensor is surveyed, and the temperature that three-temperature sensor is surveyed is set to hot water reference temperature by main controller；
Step c：Temperature difference between the flue-gas temperature that main controller calculating steam reference temperature and second temperature sensor are surveyed is used as the first temperature difference, the temperature difference that main controller is calculated between the vapor (steam) temperature that steam reference temperature and the first temperature sensor are surveyed is poor as second temperature, and the temperature difference between the flue-gas temperature that main controller calculating hot water reference temperature and second temperature sensor are surveyed is used as the 3rd temperature difference；
Step d：The temperature difference of main controller real-time monitoring first, second, and third with boiler operation time change; when at least one of first, second, and third temperature difference temperature difference gradually increase with run time and not less than triggering alarm setting value when; main controller judges that the running status of now boiler is dry-fire condition; send alarm signal to alarm equipment alarm; and operational order to actuator is sent, actuator controls burner, water pump and the water-suppling electromagnetic valve of boiler to shut down/close.
5. a kind of anti-dry guard method for fuel-oil or fuel-gas boiler according to claim 4, it is characterised in that：
Main controller judges that boiler comprises the following steps as the detailed process of dry-fire condition in step d：
Step d1：Judge whether the first temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then entering step d2；
Step d2：Judge whether second temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then entering step d3；
Step d3：Judge whether the 3rd temperature difference gradually increases and not less than setting value with run time, if being then judged to dry-fire condition, if not then rebound step d1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510894888.2A CN106855228A (en) | 2015-12-08 | 2015-12-08 | A kind of anti-dry protection device and method for fuel-oil or fuel-gas boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510894888.2A CN106855228A (en) | 2015-12-08 | 2015-12-08 | A kind of anti-dry protection device and method for fuel-oil or fuel-gas boiler |
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| CN106855228A true CN106855228A (en) | 2017-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109814464A (en) * | 2019-02-25 | 2019-05-28 | 高正昊 | A kind of family's gas-cooker dryouies monitor control system and control method with intelligent waterproof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109814464A (en) * | 2019-02-25 | 2019-05-28 | 高正昊 | A kind of family's gas-cooker dryouies monitor control system and control method with intelligent waterproof |
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