CN113375134B - Control method of steam system - Google Patents
Control method of steam system Download PDFInfo
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- CN113375134B CN113375134B CN202110711324.6A CN202110711324A CN113375134B CN 113375134 B CN113375134 B CN 113375134B CN 202110711324 A CN202110711324 A CN 202110711324A CN 113375134 B CN113375134 B CN 113375134B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a control method of a steam system, which comprises the following steps: the rotating speed of the fan is controlled to change to form a plurality of wind speed gears, a high-speed gear and a low-speed gear exist in the gears, and the valve opening of the proportional valve changes along with the wind speed; detecting the state of a steam valve to determine the number of the unit cabinets in work, and matching a high-speed gear and a low-speed gear according to the number of the unit cabinets in work; a temperature sensor in the unit cabinet body in work senses the temperature in the unit cabinet body to obtain a measured temperature, and if any obtained measured temperature is less than or equal to a set lower limit temperature, the gear of the fan is switched to a high-speed gear; and if all the obtained measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a low-speed gear. The application aims to provide a control method of a steam system, and the control method of the steam system can reduce the energy consumption of the steam system and achieve the effects of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the field of steam heating cooking, in particular to a control method of a steam system.
Background
The steam system generally comprises a steam generator, a steam cabinet and other equipment, wherein a water tank and a combustion heat exchange chamber are arranged in the steam generator, so that steam is generated after water in the water tank is heated, and the steam is conveyed into the steam cabinet for heating; the amount of steam that produces in the steam generator generally can not be controlled to current steam system, and is too much when steam production, carries back in the steam chest because pressure is too big in the steam chest, and steam can be discharged through the relief valve on the steam chest, avoids producing the accident, and direct exhaust steam has just led to the loss of the energy, is unfavorable for whole steam system's energy saving and emission reduction.
Disclosure of Invention
The invention aims to solve the technical problems and provides a control method of a steam system, which reduces the energy consumption of the steam system through the control mode and achieves the effects of energy conservation and emission reduction.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a control method of a steam system comprises a steam generator, a steam cabinet, a fan and a proportional valve; the steam cabinet is internally provided with a plurality of unit cabinet bodies, each unit cabinet body is internally provided with a temperature sensor, the steam loop respectively forms a steam branch circuit to be communicated with each unit cabinet body, a steam valve is arranged at a steam inlet communicated with the steam branch circuit of each unit cabinet body, and the steam valve is used for opening or closing the corresponding steam branch circuit of the unit cabinet body; the control method comprises the following steps:
the rotating speed of the fan is controlled to change to form a plurality of wind speed gears, a high-speed gear and a low-speed gear exist in the gears, and the valve opening of the proportional valve changes along with the wind speed;
detecting the state of a steam valve to determine the number of the unit cabinets in work, and matching a high-speed gear and a low-speed gear according to the number of the unit cabinets in work;
a temperature sensor in the unit cabinet body in work senses the temperature in the unit cabinet body to obtain a measured temperature, and if any obtained measured temperature is less than or equal to a set lower limit temperature, the gear of the fan is switched to a high-speed gear; and if all the obtained measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a low-speed gear.
According to the control mode of the steam system, a plurality of wind speed gears are formed by controlling the rotation speed change of the fan, the wind speed is related to the opening degree of the proportional valve, and the mixing proportion of gas and air is controlled by the opening degree of the proportional valve, so that premixed gas with different mixing proportions is formed according to the wind speed and is blown to the steam generator, and the steam generator can generate steam with different quantities according to the change of the gears; the wind speed gear is controlled by monitoring the steam temperature in the unit cabinet body, so that the quantity of steam provided by the steam generator for the unit cabinet body is controlled, the pressure relief of the steam caused by starting a pressure relief valve due to overhigh steam temperature and steam pressure in the unit cabinet body is avoided, and the problem that the steam temperature is too low to achieve a good steam heating cooking effect is also avoided; when the measured temperature of any unit cabinet body is less than or equal to the set lower limit temperature, the gear of the fan is switched to a high-speed gear, and the fuel gas supply is increased, so that the steam generator can generate more steam supply, and the temperature in the unit cabinet body is increased; when all the obtained measured temperatures are greater than or equal to the set upper limit temperature, the gear of the fan is switched to a low-speed gear, the gas supply is reduced, the steam supply of the steam generator is reduced, and the temperature in the unit cabinet body is reduced.
Preferably, the steam cabinet is provided with three unit cabinet bodies, the number of the temperature sensors and the steam valve matching unit cabinet bodies is set, and the control method comprises the following steps:
controlling the rotation speed of the fan to change to form at least six wind speed gears, wherein the wind speeds of the gears comprise a first low-speed gear, a second low-speed gear, a third low-speed gear, a first high-speed gear, a second high-speed gear and a third high-speed gear from low to high;
detecting the state of a steam valve to determine the number of the unit cabinets in work;
when the number of the unit cabinet bodies in work is 1, matching a first low-speed gear with a first high-speed gear; if the measured temperature is less than or equal to the set lower limit temperature, the gear of the fan is switched to a first high-speed gear, and if the measured temperature is greater than or equal to the set upper limit temperature, the gear of the fan is switched to a first low-speed gear;
when the number of the unit cabinet bodies in work is 2, matching a second low-speed gear with a second high-speed gear; if any one of the measured temperatures is less than or equal to the set lower limit temperature, the gear of the fan is switched to a second high-speed gear, and if all the measured temperatures are greater than or equal to the set upper limit temperature, the gear of the fan is switched to a second low-speed gear;
when the number of the unit cabinet bodies in work is 3, matching a third low-speed gear with a third high-speed gear; and if any one measured temperature is less than or equal to the set lower limit temperature, switching the gear of the fan to a third high-speed gear, and if all measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a third low-speed gear.
Further, the steam valve further comprises a proximity switch, and the proximity switch is used for detecting the switch state of the steam valve. The proximity switch is used for detecting the switch state of the steam valve, so that the working state of steam heating of the unit cabinet bodies is judged.
Still further, the steam loop further comprises a loop pump and a tee joint, the steam generator is connected into the steam loop through the tee joint, and the loop pump is arranged between the tee joint and a steam outlet of the unit cabinet body.
Still further, the steam generator comprises a water tank, a blowoff valve and a water level sensor are arranged in the water tank, the water level sensor is used for sensing the water level in the water tank, and the control method comprises the following steps:
and opening a blowdown valve for blowdown, and judging that the blowdown is finished when the water level sensor senses that the water level signal in the water tank is lower than the set low water level signal and the state of the water level signal lower than the set low water level signal is maintained for a first set time. General steam generator can persist the sewage that has impurity such as solid residue in the water tank, if not in time get rid of sewage, then influence steam generator's that can be very big heat exchange efficiency and life-span, and generally have level sensor in current steam generator's the water tank, current level sensor is used for detecting the water level in the water tank, thereby keep the water tank in suitable water level, the low water level signal that current level sensor formed is provided in this application, be in the duration of low water level signal according to the water tank and carry out the judgement basis whether the blowdown is successful, thereby form the control method to the blowdown.
Still further, the control method includes the steps of:
and when the steam system runs for a second set time, sending a pollution discharge reminding signal, suspending the starting function of the steam system, and recovering the starting function of the steam system after judging that the pollution discharge is finished. The method can discharge pollution forcibly to protect the steam generator.
Still further, the blowoff valve is a mechanical valve. The inventor discovers through long-term tests that when the sewage containing a large amount of solid residues in the steam generator of the application is discharged by adopting automatically controlled valves such as an electric valve, the service life of the valve is obviously shortened, the subsequent maintenance cost of the product is high, and the service life of the valve is short, so that the blowdown valve of the application adopts a mechanical valve, the product cost is reduced, and the product reliability is improved.
Drawings
FIG. 1 is a schematic view of a steam system of the present invention.
Detailed Description
The control method of a steam system of the present invention is described with reference to the accompanying drawings.
Example 1
A control method of a steam system comprises a steam generator 1, a steam cabinet, a fan and a proportional valve; a premixed fuel gas 2 is provided for a steam generator 1 through the fan and the proportional valve, a steam loop is formed in the steam cabinet, the steam generator 1 generates steam and conveys the steam into the steam loop, the steam cabinet is provided with a plurality of unit cabinet bodies 3, a temperature sensor is arranged in each unit cabinet body 3, the steam loop respectively forms a steam branch and is communicated with each unit cabinet body 3, a steam valve 4 is arranged at a steam inlet communicated with the steam branch of each unit cabinet body 3, and the steam valve 4 is used for opening or closing the corresponding steam branch of the unit cabinet body 3; the control method comprises the following steps:
the rotating speed of the fan is controlled to change to form a plurality of wind speed gears, a high-speed gear and a low-speed gear exist in the gears, and the valve opening of the proportional valve changes along with the wind speed;
detecting the state of the steam valve 4 to determine the number of the unit cabinets 3 in work, and matching a high-speed gear and a low-speed gear according to the number of the unit cabinets 3 in work;
a temperature sensor in the unit cabinet body 3 in work senses the temperature in the unit cabinet body 3 to obtain measured temperature, and if any one obtained measured temperature is less than or equal to a set lower limit temperature, the gear of the fan is switched to a high-speed gear; and if all the obtained measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a low-speed gear.
According to the control mode of the steam system, a plurality of wind speed gears are formed by controlling the rotation speed change of the fan, the wind speed is related to the opening of the proportional valve, and the mixing proportion of gas and air is controlled by the opening of the proportional valve, so that premixed gas 2 with different mixing proportions is formed according to the wind speed and is blown to the steam generator 1, and the steam generator 1 can generate steam with different quantities according to the change of the gears; the wind speed gear is controlled by monitoring the steam temperature in the unit cabinet body 3, so that the amount of steam provided by the steam generator 1 for the unit cabinet body 3 is controlled, the pressure relief of the steam by starting a pressure relief valve due to overhigh steam temperature and steam pressure in the unit cabinet body 3 is avoided, and the problem that the steam temperature is too low to achieve a good steam heating cooking effect is also avoided; when the measured temperature of any unit cabinet body 3 is less than or equal to the set lower limit temperature, the gear of the fan is switched to a high-speed gear, the fuel gas supply is increased, the steam generator 1 can generate more steam supply, and the temperature in the unit cabinet body 3 is increased; when all the obtained measured temperatures are greater than or equal to the set upper limit temperature, the gear of the fan is switched to a low-speed gear, the gas supply is reduced, the steam supply of the steam generator 1 is reduced, and the temperature in the unit cabinet body 3 is reduced.
And a proximity switch for detecting the switch state of the steam valve 4. The proximity switch is used for detecting the switch state of the steam valve 4, so as to judge how many unit cabinets 3 are in the steam heating working state.
The steam loop further comprises a loop pump 5 and a tee joint, the steam generator 1 is connected into the steam loop through the tee joint, and the loop pump 5 is arranged between the tee joint and a steam outlet of the unit cabinet body 3.
Example 2
As shown in fig. 1, a more preferred embodiment is provided on the basis of example 1, the steam cabinet is provided with three unit cabinets 3, and the temperature sensors and the steam valves 4 are arranged in accordance with the number of the unit cabinets 3, and the control method includes the following steps:
controlling the rotation speed of the fan to change to form at least six wind speed gears, wherein the wind speeds of the gears comprise a first low-speed gear, a second low-speed gear, a third low-speed gear, a first high-speed gear, a second high-speed gear and a third high-speed gear from low to high;
detecting the state of the steam valve 4 to determine the number of the unit cabinets 3 in work;
when the number of the unit cabinet bodies 3 in work is 1, matching a first low-speed gear with a first high-speed gear; if the measured temperature is less than or equal to the set lower limit temperature, the gear of the fan is switched to a first high-speed gear, and if the measured temperature is greater than or equal to the set upper limit temperature, the gear of the fan is switched to a first low-speed gear;
when the number of the unit cabinet bodies 3 in work is 2, matching a second low-speed gear with a second high-speed gear; if any one of the measured temperatures is less than or equal to the set lower limit temperature, the gear of the fan is switched to a second high-speed gear, and if all the measured temperatures are greater than or equal to the set upper limit temperature, the gear of the fan is switched to a second low-speed gear;
when the number of the unit cabinet bodies 3 in operation is 3, a third low-speed gear and a third high-speed gear are matched; and if any measured temperature is less than or equal to the set lower limit temperature, switching the gear of the fan to a third high-speed gear, and if all measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a third low-speed gear.
Example 3
On the basis of the embodiment 1 and the embodiment 2, the energy-saving effect of the steam system is further improved.
The steam generator 1 comprises a water tank, a blowdown valve and a water level sensor are arranged in the water tank, the water level sensor is used for sensing the water level in the water tank, and the control method comprises the following steps:
and opening a blowdown valve for blowdown, and judging that the blowdown is finished when the water level sensor senses that the water level signal in the water tank is lower than the set low water level signal and the state of the water level signal lower than the set low water level signal is maintained for a first set time. General steam generator 1 can persist the sewage that has impurity such as solid residue in the water tank, if not in time get rid of sewage, then influence steam generator 1's that can be very big heat exchange efficiency and life-span, and generally have level sensor in current steam generator 1's the water tank, current level sensor is used for detecting the water level in the water tank, thereby keep the water tank in suitable water level, this application provides the low water level signal that current level sensor formed, whether the duration that is in low water level signal according to the water tank carries out the judgement basis that the blowdown is successful, thereby form the control method to the blowdown.
The control method comprises the following steps:
and when the steam system runs for a second set time, sending a pollution discharge reminding signal, suspending the starting function of the steam system, and recovering the starting function of the steam system after judging that the pollution discharge is finished. The method forcibly discharges the sewage to protect the steam generator 1.
The blowdown valve is a mechanical valve. The inventor discovers through long-term test that automatic control's such as motorised valve, when discharging the sewage that contains a large amount of solid residue in the steam generator 1 of this application, the life-span can show to shorten, causes the subsequent maintenance cost of product high, and the life-span is short, therefore the blowoff valve of this application adopts mechanical type valve, reduces product cost, improves product reliability.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. The control method of the steam system is characterized by comprising a steam generator, a steam cabinet, a fan and a proportional valve; the steam cabinet is internally provided with a plurality of unit cabinet bodies, each unit cabinet body is internally provided with a temperature sensor, the steam loop respectively forms a steam branch circuit to be communicated with each unit cabinet body, a steam valve is arranged at a steam inlet communicated with the steam branch circuit of each unit cabinet body, and the steam valve is used for opening or closing the corresponding steam branch circuit of the unit cabinet body; the control method comprises the following steps:
the rotating speed of the fan is controlled to change to form a plurality of wind speed gears, a high-speed gear and a low-speed gear exist in the gears, and the valve opening of the proportional valve changes along with the wind speed;
detecting the state of a steam valve to determine the number of the unit cabinets in work, and matching a high-speed gear and a low-speed gear according to the number of the unit cabinets in work;
a temperature sensor in the unit cabinet body in work senses the temperature in the unit cabinet body to obtain a measured temperature, and if any obtained measured temperature is less than or equal to a set lower limit temperature, the gear of the fan is switched to a high-speed gear; if all the obtained measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a low-speed gear;
the steam cabinet is provided with three unit cabinet bodies, the temperature sensors and the steam valves are matched with the unit cabinet bodies in quantity, and the control method comprises the following steps:
controlling the rotation speed of the fan to change to form at least six wind speed gears, wherein the wind speeds of the gears comprise a first low-speed gear, a second low-speed gear, a third low-speed gear, a first high-speed gear, a second high-speed gear and a third high-speed gear from low to high;
detecting the state of a steam valve to determine the number of the unit cabinets in work;
when the number of the unit cabinet bodies in work is 1, matching a first low-speed gear with a first high-speed gear; if the measured temperature is less than or equal to the set lower limit temperature, the gear of the fan is switched to a first high-speed gear, and if the measured temperature is greater than or equal to the set upper limit temperature, the gear of the fan is switched to a first low-speed gear;
when the number of the unit cabinet bodies in work is 2, matching a second low-speed gear with a second high-speed gear; if any one of the measured temperatures is less than or equal to the set lower limit temperature, the gear of the fan is switched to a second high-speed gear, and if all the measured temperatures are greater than or equal to the set upper limit temperature, the gear of the fan is switched to a second low-speed gear;
when the number of the unit cabinet bodies in work is 3, matching a third low-speed gear with a third high-speed gear; and if any measured temperature is less than or equal to the set lower limit temperature, switching the gear of the fan to a third high-speed gear, and if all measured temperatures are greater than or equal to the set upper limit temperature, switching the gear of the fan to a third low-speed gear.
2. The method of claim 1, further comprising a proximity switch for detecting a switch state of the steam valve.
3. The control method of a steam system according to claim 1, wherein the steam circuit further comprises a circuit pump and a tee, the steam generator being connected into the steam circuit through the tee, the circuit pump being disposed between the tee and the steam outlet of the unit cabinet.
4. The method of controlling a steam system according to claim 1, wherein the steam generator includes a water tank having a blowoff valve and a water level sensor therein for sensing a water level in the water tank, the method comprising the steps of:
and opening a blowdown valve for blowdown, and judging that the blowdown is finished when the water level sensor senses that the water level signal in the water tank is lower than the set low water level signal and the state of the water level signal lower than the set low water level signal is maintained for a first set time.
5. The control method of a steam system according to claim 4, characterized in that the control method comprises the steps of:
and when the steam system runs for a second set time, sending a pollution discharge reminding signal, suspending the starting function of the steam system, and recovering the starting function of the steam system after judging that the pollution discharge is finished.
6. The method of claim 4, wherein the blowdown valve is a mechanical valve.
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| CN202110711324.6A CN113375134B (en) | 2021-06-25 | 2021-06-25 | Control method of steam system |
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| CN202110711324.6A CN113375134B (en) | 2021-06-25 | 2021-06-25 | Control method of steam system |
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| CN113375134A CN113375134A (en) | 2021-09-10 |
| CN113375134B true CN113375134B (en) | 2023-01-24 |
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| JPH10246431A (en) * | 1997-03-07 | 1998-09-14 | Hanshin Electric Co Ltd | Calibrating method of fuel flow regulating valve for combustion apparatus and air-sending fan motor |
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| CN107334372A (en) * | 2017-06-06 | 2017-11-10 | 山东东方方圆厨房设备有限公司 | Steamer |
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| CN108451370A (en) * | 2018-04-12 | 2018-08-28 | 无锡市启山林科技有限公司 | Commercial gas premixes ratio control energy-saving steam cabinet and its control method entirely |
| CN112773183A (en) * | 2021-01-27 | 2021-05-11 | 宁波方太厨具有限公司 | Steam box and fan rotating speed control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160157658A1 (en) * | 2014-12-05 | 2016-06-09 | Timothy L. Cupp | Steam cooking oven and method |
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2021
- 2021-06-25 CN CN202110711324.6A patent/CN113375134B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10246431A (en) * | 1997-03-07 | 1998-09-14 | Hanshin Electric Co Ltd | Calibrating method of fuel flow regulating valve for combustion apparatus and air-sending fan motor |
| CN102454975A (en) * | 2010-10-26 | 2012-05-16 | 佛山市顺德区盛熙电器制造有限公司 | Steam supply device, hanging-type ironer, steam mop, steam humidifier, steam cleaner and electric food steamer |
| CN107334372A (en) * | 2017-06-06 | 2017-11-10 | 山东东方方圆厨房设备有限公司 | Steamer |
| CN107340736A (en) * | 2017-06-06 | 2017-11-10 | 山东东方方圆厨房设备有限公司 | The control system of steamer |
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| CN112773183A (en) * | 2021-01-27 | 2021-05-11 | 宁波方太厨具有限公司 | Steam box and fan rotating speed control method thereof |
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| CN113375134A (en) | 2021-09-10 |
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