CN112146278B - Control method of full-premix gas water heater and gas water heater - Google Patents
Control method of full-premix gas water heater and gas water heater Download PDFInfo
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- CN112146278B CN112146278B CN201910575310.9A CN201910575310A CN112146278B CN 112146278 B CN112146278 B CN 112146278B CN 201910575310 A CN201910575310 A CN 201910575310A CN 112146278 B CN112146278 B CN 112146278B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 256
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000001301 oxygen Substances 0.000 claims abstract description 108
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 108
- 238000002485 combustion reaction Methods 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims description 31
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 239000002737 fuel gas Substances 0.000 claims description 18
- 239000000779 smoke Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
-
- 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
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a control method of a full-premix gas water heater, which comprises the following steps: starting a gas water heater, and collecting the current air flow and the output heat load value; if the current gas flow is not consistent with the preset standard value and the fan flow and the excess oxygen content of the air and the combusted gas are respectively consistent with the corresponding preset standard value, adjusting the current gas flow input by the gas water heater to enable the current gas flow to be consistent with the preset standard value; and if the current fan flow is not consistent with the preset standard value, and the gas flow and the excess oxygen content after the air and the gas are combusted are respectively consistent with the corresponding preset standard value, adjusting the current fan flow input by the gas water heater, so that the current fan flow is consistent with the preset standard value. According to the invention, by adjusting the current gas flow, air flow and fan flow, the phenomenon of difficult backfire and the effect of not reducing the fully premixed combustion load when the gas flow of the gas water heater fluctuates are effectively avoided.
Description
Technical Field
The invention belongs to the technical field of control of gas water heaters, and particularly relates to a control method of a full-premix gas water heater and the gas water heater.
Background
In the existing gas water heating device, the device can be divided into a full premix burner type and a partial premix burner type according to the combustion mode of gas, particularly different mixing ratios of air and gas. Wherein, the full premix has the following characteristics: the air and the fuel gas are fully mixed according to the chemical equivalent ratio before combustion, and then ignition combustion is carried out, so that the fuel gas burner has many advantages, such as full combustion of the fuel gas, high volumetric heat intensity, high heat efficiency, low harmful emission index and the like; however, when the pressure of the pipe network fluctuates and the external wind pressure fluctuates, the full premix combustion is easy to generate a backfire phenomenon, and the full premix combustion load may also be reduced.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a control method for a fully premixed gas water heater, which solves the problems in the prior art that when the pressure of a gas water heater pipe network fluctuates and the external wind pressure fluctuates, the backfire phenomenon easily occurs and the fully premixed combustion load is reduced.
The invention also aims to provide a gas water heater using the control method.
The technical scheme of the invention is realized as follows: a method of controlling a fully premixed gas water heater, the method comprising:
starting the gas water heater, and collecting the current gas flow, the fan flow and the excess oxygen content of air and gas after combustion;
if the current gas flow, the fan flow and the excess oxygen content of the air and the combusted gas are consistent with the corresponding preset standard values, the gas water heater does not carry out load control;
if the current gas flow is not consistent with the preset standard value, and the fan flow and the excess oxygen content of the air and the combusted gas are respectively consistent with the corresponding preset standard value, adjusting the current gas flow input by the gas water heater to enable the current gas flow to be consistent with the preset standard value;
if the current fan flow is not consistent with a preset standard value, and the gas flow and the excess oxygen content of the air and the gas after combustion are respectively consistent with the corresponding preset standard values, adjusting the current fan flow input by the gas water heater to enable the current fan flow to be consistent with the preset standard value;
and if the content of the excess oxygen generated after the current air and the gas are combusted is inconsistent with the preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater, so that the content of the current excess oxygen is consistent with the preset standard value.
Optionally, the method further comprises:
if the current gas flow, the fan flow and the excess oxygen content after the air and gas are combusted are all inconsistent with the corresponding preset standard values, the current gas flow, the fan flow and the air flow input by the gas water heater are adjusted simultaneously, so that the current gas flow, the fan flow and the excess oxygen content after the air and gas are combusted are respectively consistent with the corresponding preset standard values.
Optionally, if the current fan flow is not consistent with the preset standard value, and the gas flow and the excess oxygen content after the air and gas are combusted are respectively consistent with the corresponding preset standard value, the current fan flow input by the gas water heater is adjusted, so that the current fan flow is consistent with the preset standard value, and the specific method comprises the following steps:
if the current gas flow is inconsistent with the preset standard value, and when the fan flow and the excess oxygen content after air and gas combustion are respectively consistent with the corresponding preset standard value, the opening degree of the pipeline inputting the current gas flow is adjusted, so that the gas flow is consistent with the preset gas flow.
Optionally, if the content of the excess oxygen after the current air and gas combustion is inconsistent with a preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to make the current content of the excess oxygen consistent with the preset standard value; the specific method comprises the following steps:
if the excess oxygen content of the current air and the burnt gas is higher than a preset standard value and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of a pipeline inputting the current air flow is reduced, so that the heat excess oxygen content is consistent with the preset standard value;
if the excess oxygen content of the current air and the burnt gas is lower than the preset standard value and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of the pipeline inputting the current air flow is increased, so that the heat excess oxygen content is consistent with the preset standard value.
Optionally, the method for detecting the excess oxygen content comprises:
collecting the excess oxygen content of air and fuel gas in the gas water heater after combustion, and if the excess oxygen content exceeds the preset oxygen content, judging that the excess oxygen content is higher than a preset standard value; and if the excess oxygen content is lower than the preset oxygen content, judging that the excess oxygen content is lower than a preset standard value.
Optionally, the step of starting the gas water heater and collecting the current air flow input by the gas water heater and the output excess oxygen content further comprises:
the oxygen content required by combustion of the fuel gas is x, the oxygen content in the current air flow is alpha ', and the ratio of alpha' to x is more than 1.
The other technical scheme of the invention is realized as follows: a full-premix gas water heater comprises a combustor for generating energy, a heat exchanger for outputting heat, a fan for transforming pressure, a flue gas detection device for detecting the content of excess oxygen after combustion, a mixing pipeline for inputting air and gas, a detection control module and an anemoscope, wherein the mixing pipeline comprises a gas pipeline and an air pipeline, a gas flow regulating unit is arranged on the gas pipeline, an air proportional valve is arranged on the air pipeline, the gas pipeline and the air pipeline are respectively communicated with the fan, the fan is also communicated with the combustor, the combustor is communicated with the heat exchanger, the output end of the heat exchanger is communicated with the flue gas detection device, and the output end of the flue gas detection device is connected with the anemoscope; the gas flow regulating unit, the air proportional valve, the smoke detection device and the anemoscope are respectively and electrically connected with the detection control module.
Optionally, the gas flow regulating unit further comprises a gas proportional valve and a gas flowmeter, and the gas proportional valve and the gas flowmeter are arranged on the gas pipeline; and the gas proportional valve and the gas flowmeter are electrically connected with the detection control module.
Optionally, the fan further comprises a driven impeller for guiding the airflow, and the driven impeller is arranged on a pipeline of the mixing pipeline communicated with the fan.
Optionally, the water inlet end of the heat exchanger is provided with a water regulating valve, the water outlet end of the heat exchanger is also provided with a water temperature sensor, and the water regulating valve and the water temperature sensor are both electrically connected with the detection control module.
Compared with the prior art, the invention effectively realizes the functions that the full-premix combustion is not easy to generate the backfire phenomenon and the full-premix combustion load is not reduced when the air pressure of the inlet fluctuates, the external back pressure fluctuates and the pipe network pressure fluctuates by adjusting the current gas flow, the air flow and the fan flow input by the gas water heater.
Drawings
Fig. 1 is a flowchart of a control method of a fully premixed combustion gas water heater provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a fully premixed combustion gas water heater provided in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment 1 of the invention provides a control method of a fully premixed gas water heater, which comprises the following steps:
starting the gas water heater, and collecting the current gas flow, the fan flow and the excess oxygen content of air and gas after combustion;
if the current gas flow, the fan flow and the excess oxygen content of the air and the combusted gas are consistent with the corresponding preset standard values, the gas water heater does not carry out load control;
if the current gas flow is not consistent with the preset standard value, and the fan flow and the excess oxygen content of the air and the combusted gas are respectively consistent with the corresponding preset standard value, adjusting the current gas flow input by the gas water heater to enable the current gas flow to be consistent with the preset standard value;
if the current fan flow is not consistent with a preset standard value, and the gas flow and the excess oxygen content of the air and the gas after combustion are respectively consistent with the corresponding preset standard values, adjusting the current fan flow input by the gas water heater to enable the current fan flow to be consistent with the preset standard value;
and if the excess oxygen content of the current air and the burnt gas is inconsistent with the preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to ensure that the current excess oxygen content is consistent with the preset standard value.
Further, the method also includes:
if the current gas flow, the fan flow and the excess oxygen content after the air and gas are combusted are all inconsistent with the corresponding preset standard values, the current gas flow, the fan flow and the air flow input by the gas water heater are adjusted simultaneously, so that the current gas flow, the fan flow and the excess oxygen content after the air and gas are combusted are respectively consistent with the corresponding preset standard values.
Further, if the current fan flow is not consistent with a preset standard value, and the gas flow and the excess oxygen content after the air and the gas are combusted are respectively consistent with the corresponding preset standard value, the current fan flow input by the gas water heater is adjusted, so that the current fan flow is consistent with the preset standard value, and the specific method comprises the following steps:
if the current gas flow is inconsistent with the preset standard value, and when the fan flow and the excess oxygen content after air and gas combustion are respectively consistent with the corresponding preset standard value, the opening degree of the pipeline inputting the current gas flow is adjusted, so that the gas flow is consistent with the preset gas flow.
In a specific implementation process, if the content of the excess oxygen after the current air and gas are combusted is not consistent with a preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to enable the content of the current excess oxygen to be consistent with the preset standard value; the specific method comprises the following steps:
if the excess oxygen content of the current air and the burnt gas is higher than a preset standard value and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of a pipeline inputting the current air flow is reduced, so that the heat excess oxygen content is consistent with the preset standard value;
if the excess oxygen content of the current air and the burnt gas is lower than a preset standard value and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of a pipeline inputting the current air flow is increased, so that the heat excess oxygen content is consistent with the preset standard value;
further, in one embodiment, the method for detecting the excess oxygen content includes:
collecting the excess oxygen content of air and fuel gas in the gas water heater after combustion, and if the excess oxygen content exceeds the preset oxygen content, judging that the excess oxygen content is higher than a preset standard value; and if the excess oxygen content is lower than the preset oxygen content, judging that the excess oxygen content is lower than a preset standard value.
Further, the step of starting the gas water heater and collecting the current air flow input by the gas water heater and the output excess oxygen content further comprises the following steps:
the oxygen content required by combustion of the fuel gas is x, the oxygen content in the current air flow is alpha ', and the ratio of alpha' to x is more than 1.
The control method provided by the embodiment 1 of the invention comprises the following operation steps:
step S1: preparation of
Taking natural gas as a reference, configuring an air-fuel ratio according to a combustion reaction formula (the following formula), and taking the excess oxygen content (alpha) to be 5-10%:
secondly, measuring a curve of the rotating speed of the fan to the air quantity in advance, adjusting the air quantity of the motor, and storing the curve to a storage of the gas water heater;
thirdly, assuming that the thermal load interval of the gas water heater is [ QL, QH ], the regulating interval corresponding to the direct current fan is [ PL1, PH1 ]; the adjusting range of the fuel gas proportional valve is [ PL2, PH2 ]; the air proportional valve regulating interval is [ PL3, PH3 ];
setting an initial value: taking an initial value
At this time correspond to
，
，
。
Step S2: initialization
Electrifying the gas water heater, electrifying the gas water heater for self-detection, and detecting whether all components work normally through a controller;
and secondly, loading the data prepared in the first step, and initializing the set data to hardware.
③ pass
Calculating gas flow
And converting the air flow rate into the air flow rate according to the chemical reaction equivalent and the excess oxygen content alpha, wherein the air flow rate is
；
Fourthly, by
、
Determining fan flow and fan 102Adjustment value of
；
Controlling the air flow through the air proportional valve 108 and the smoke detection device 103 until the system runs stably;
sixthly, the flow of the fan is controlled by the fan (preferably a direct current fan) 12 and the anemoscope 106 to adapt to the external pressure, so that the heat load of the hot water device is accurately controlled until the system runs stably.
Step S3: detecting, collecting data and operating
Firstly, data (mainly including heat load, 108-degree opening of an air regulating valve, fan control parameters, excess oxygen content and the like) are collected, Q,
、
、
、
、
、
；
When the other parameters are not changed,
in time of change (due to pipe network pressure change, etc.)
If it is not
When the pressure of the pipe network is increased, the gas proportional valve 1071 is adjusted to be small;
if it is not
When the pressure of the pipe network is reduced, the gas proportional valve 1072 is increased;
if it is not
If not, entering the fourth step;
when the other parameters are not changed, the parameters are changed,
when changed (due to air inlet pressure change)
If it is not
When the back pressure becomes lower, the air proportional valve 108 is adjusted to be smaller;
if it is used
When the back pressure becomes higher, the air proportional valve 108 is increased;
if it is not
If not, entering the fourth step;
when other parameters are not changed, the data of the,
when changed (caused by back pressure change)
If it is used
When the back pressure is increased, the air quantity of the fan is adjusted to be small;
if it is used
When the back pressure is increased, the air quantity of the fan is increased;
if it is not
If not, entering the fourth step;
and when other parameters are unchanged, changing the load (setting and adjusting by a user).
Calculating gas flow by Q
Calculating an air coefficient according to a chemical reaction formula and the excess oxygen coefficient alpha, and accurately controlling the air flow through a fuel gas proportional valve 1071;
by passing
And with
Determining the flow and regulation value of the fan
；
The air flow is accurately controlled through the air proportional valve 108 and the smoke detection device 103;
regulating value by fan
The anemometer 106 controls the flow of the fan, so that the heat load is accurately controlled;
until combustion is smooth
After the scheme is adopted, the current gas flow, the fan flow and the excess oxygen content of air and gas after combustion are input under the working state of the gas water heater; 1) when the current gas flow, the fan flow and the excess oxygen content of the air and the combusted gas are consistent with the corresponding preset standard values, the gas water heater does not carry out load control; 2) if the current gas flow is not consistent with the corresponding preset standard value, and the fan flow and the corresponding preset standard values of the air and the excess oxygen content after gas combustion are respectively consistent, adjusting the current gas flow input by the gas water heater to enable the current gas flow to be consistent with the preset standard value; 3) when the current fan flow is not consistent with the corresponding preset standard value, and the gas flow and the corresponding preset standard values of the excess oxygen content after the air and the gas are combusted are consistent, the current fan flow input by the gas water heater is adjusted, so that the current fan flow is consistent with the preset standard value; 4) when the content of the excess oxygen after the combustion of the current air and the gas is inconsistent with the corresponding preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard value, adjusting the current air flow input by the gas water heater to ensure that the content of the current excess oxygen is consistent with the preset standard value; therefore, the effects that when the air pressure at the inlet fluctuates, the external back pressure fluctuates and the pressure of the pipe network fluctuates, the full-premixing combustion is not easy to generate the tempering phenomenon and the full-premixing combustion load cannot be reduced are effectively realized.
Embodiment 2 of the present invention provides a fully premixed gas water heater, as shown in fig. 2, including a burner 100 for generating energy, a heat exchanger 101 for outputting heat, a blower 102 for changing pressure, a flue gas detection device 103 for detecting excess oxygen content after combustion, a mixing pipe 104 for inputting air and gas, a detection control module 105, and an anemometer 106, where the mixing pipe 104 includes a gas pipe 1041 and an air pipe 1042, a gas flow regulating unit 107 is arranged on the gas pipeline 1041, an air proportional valve 108 is arranged on the air pipeline 1042, the gas pipe 1041 and the air pipe 1042 are respectively communicated with a fan 102, the fan 102 is also communicated with the burner 100, the burner 100 is communicated with the heat exchanger 101, the output end of the heat exchanger 101 is communicated with a smoke detection device 103, and the output end of the smoke detection device 103 is connected with an anemometer 106; the gas flow regulating unit 107, the air proportional valve 108, the smoke detection device 103 and the anemoscope 106 are respectively electrically connected with the detection control module 105;
by adopting the gas water heater with the structure, when the gas water heater is used, when the current gas flow, the fan flow and the excess oxygen content of air and gas after combustion are consistent with the corresponding preset standard values, the gas water heater does not carry out load control; when the current gas flow is not consistent with the corresponding preset standard value, and the fan flow and the corresponding preset standard values of the excess oxygen content after the air and the gas are combusted are consistent, the gas flow is consistent with the preset gas flow by adjusting the opening of a gas proportional valve 1071 arranged on the current gas pipeline 1041; when the excess oxygen content of the combusted current air and fuel gas is higher than the corresponding preset standard values, and the fuel gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of a pipeline inputting the current fuel gas flow is increased, so that the heat excess oxygen content is consistent with the preset standard values; if the current fan flow is not consistent with the corresponding preset standard value, and the gas flow and the excess oxygen content after the air and the gas are combusted are respectively consistent with the corresponding preset standard value, adjusting the current fan flow of the fan 12 input by the gas water heater, so that the current fan flow is consistent with the preset standard value; if the excess oxygen content of the current air and the burnt gas is higher than the corresponding preset standard values, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of an air proportional valve 108 arranged on a current air pipeline 1042 is reduced, so that the heat excess oxygen content is consistent with the preset standard values; if the content of the excess oxygen after the combustion of the current air and the gas is lower than the corresponding preset standard values, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the content of the excess oxygen is made to be consistent with the preset standard values by increasing the opening degree of an air proportional valve 108 arranged on a current air pipeline 1042; therefore, the effects that when the air pressure at the inlet fluctuates, the external back pressure fluctuates and the pressure of the pipe network fluctuates, the full-premixing combustion is not easy to generate the tempering phenomenon and the full-premixing combustion load cannot be reduced are effectively realized.
Further, the gas flow regulating unit 107 further includes a gas proportional valve 1071 and a gas flow meter 1072, the gas proportional valve 1071 and the gas flow meter 1072 being disposed on the gas pipeline 1041; the gas proportional valve 1071 and the gas flowmeter 1072 are electrically connected with the detection control module 105.
Further, a passive impeller 109 for guiding the air flow is further included, and the passive impeller 109 is disposed on a duct where the mixing duct 104 communicates with the fan 102.
Furthermore, a water regulating valve 110 is disposed at a water inlet end of the heat exchanger 101, a water temperature sensor 111 is disposed at a water outlet end of the heat exchanger, and the water regulating valve 110 and the water temperature sensor 111 are both electrically connected to the detection control module 105.
The working principle of the fully premixed combustion gas water heater provided by the embodiment 2 of the invention is as follows:
according to the characteristics of full-premix combustion, air and gas are fully mixed according to a chemical equivalent ratio before combustion, then ignition combustion is carried out, and the combustion is relatively full.
The gas and air are determined according to the chemical reaction equivalent and the excess oxygen content alpha (5-10 percent can be selected), so when the load is constant, the flow of the gas and the air can be determined, and when the pressure of a gas pipe network fluctuates, the gas proportional valve 1071 and the gas flow meter 1072 can accurately control the gas flow (a PID control method); when the air inlet pressure changes, the air flow is accurately controlled through the air proportional valve 108 and the smoke detection device 103; after being fully mixed by a driven impeller, the fuel gas and the air enter a combustor through pressurization of a direct current fan; the direct current fan is used for pressurizing a mixture of fuel gas and air and controlling combustion load; the flow of the fan is determined by the heat load (which can be converted into gas flow) and the excess oxygen content alpha (which can be 5% -10%); after the gas combustion passes through the heat exchanger, the gas is discharged outwards through the smoke detection device and the anemoscope.
When the back pressure changes, the air volume of the fan 102 also changes, and is accurately controlled by the fan 102 and the anemometer 106.
When the content alpha of the excess oxygen changes, the control is accurately carried out through the smoke detection device 103 and the air proportional valve 108.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A control method for a fully premixed gas water heater, the method comprising:
starting the gas water heater, and collecting the current gas flow, the fan flow and the excess oxygen content of air and gas after combustion;
if the current gas flow, the fan flow and the excess oxygen content of the air and the combusted gas are consistent with the corresponding preset standard values, the gas water heater does not carry out load control;
if the current gas flow is not consistent with the preset standard value, and the fan flow and the excess oxygen content of the air and the combusted gas are respectively consistent with the corresponding preset standard value, adjusting the current gas flow input by the gas water heater to enable the current gas flow to be consistent with the preset standard value;
if the current fan flow is not consistent with a preset standard value, and the gas flow and the excess oxygen content of the air and the gas after combustion are respectively consistent with the corresponding preset standard values, adjusting the current fan flow input by the gas water heater to enable the current fan flow to be consistent with the preset standard value;
if the content of the excess oxygen after the current air and gas are combusted is inconsistent with a preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to enable the content of the excess oxygen to be consistent with the preset standard value;
if the current gas flow, the fan flow and the excess oxygen content after the air and gas are combusted are all inconsistent with the corresponding preset standard values, the current gas flow, the fan flow and the air flow input by the gas water heater are adjusted simultaneously, so that the current gas flow, the fan flow and the excess oxygen content after the air and gas are combusted are respectively consistent with the corresponding preset standard values.
2. The control method of the fully premixed gas water heater according to claim 1, wherein if the current fan flow rate is not consistent with a preset standard value, and the gas flow rate and the excess oxygen content of the air and the gas after combustion are respectively consistent with the corresponding preset standard values, the current fan flow rate input by the gas water heater is adjusted so that the current fan flow rate is consistent with the preset standard value, and the specific method is as follows:
if the current gas flow is inconsistent with the preset standard value, and when the fan flow and the excess oxygen content after air and gas combustion are respectively consistent with the corresponding preset standard value, the opening degree of the pipeline inputting the current gas flow is adjusted, so that the gas flow is consistent with the preset gas flow.
3. The control method of a fully premixed gas water heater according to claim 2,
if the content of the excess oxygen after the current air and gas are combusted is inconsistent with a preset standard value, and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to enable the content of the excess oxygen to be consistent with the preset standard value; the specific method comprises the following steps:
if the excess oxygen content of the current air and the burnt gas is higher than a preset standard value and the gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening of a pipeline inputting the current air flow is reduced, so that the excess oxygen content is consistent with the preset standard value;
if the content of the excess oxygen after the combustion of the current air and the fuel gas is lower than the preset standard value, and the fuel gas flow and the fan flow are respectively consistent with the corresponding preset standard values, the opening degree of a pipeline inputting the current air flow is increased, so that the content of the excess oxygen is consistent with the preset standard value.
4. The control method of a fully premixed gas water heater as claimed in claim 1 or 3, wherein the detection method of the excess oxygen content comprises:
collecting the excess oxygen content of air and fuel gas in the gas water heater after combustion, and if the excess oxygen content exceeds the preset oxygen content, judging that the excess oxygen content is higher than a preset standard value; and if the excess oxygen content is lower than the preset oxygen content, judging that the excess oxygen content is lower than a preset standard value.
5. The control method of a fully premixed gas water heater according to claim 4,
the step of starting the gas water heater and collecting the current air flow input by the gas water heater and the output excess oxygen content further comprises the following steps:
the oxygen content required by combustion of the fuel gas is x, the oxygen content in the current air flow is alpha ', and the ratio of alpha' to x is more than 1.
6. A full-premix gas water heater is characterized by comprising a burner (100) for generating energy, a heat exchanger (101) for outputting heat, a fan (102) for changing pressure, a smoke detection device (103) for detecting the content of excess oxygen after combustion, a mixing pipeline (104) for inputting air and gas, a detection control module (105) and an anemograph (106), wherein the mixing pipeline (104) comprises a gas pipeline (1041) and an air pipeline (1042), a gas flow regulating unit (107) is arranged on the gas pipeline (1041), an air proportional valve (108) is arranged on the air pipeline (1042), the gas pipeline (1041) and the air pipeline (1042) are respectively communicated with the fan (102), the fan (102) is also communicated with the burner (100), and the burner (100) is communicated with the heat exchanger (101), the output end of the heat exchanger (101) is communicated with a smoke detection device (103), and the output end of the smoke detection device (103) is connected with an anemograph (106); the gas flow regulating unit (107), the air proportional valve (108), the smoke detection device (103) and the anemoscope (106) are respectively electrically connected with the detection control module (105).
7. A fully premixed gas water heater according to claim 6, characterized in that said gas flow regulating unit (107) further comprises a gas proportional valve (1071) and a gas flow meter (1072), said gas proportional valve (1071) and gas flow meter (1072) being provided on the gas pipe (1041); the gas proportional valve (1071) and the gas flowmeter (1072) are both electrically connected with the detection control module (105).
8. A fully premixed gas water heater according to claim 6 or 7, further comprising a passive impeller (109) for guiding the gas flow, said passive impeller (109) being arranged on the duct of the mixing duct (104) communicating with the fan (102).
9. The fully premixed gas water heater according to claim 8, wherein the water inlet end of the heat exchanger (101) is provided with a water regulating valve (110), the water outlet end of the heat exchanger is further provided with a water temperature sensor (111), and the water regulating valve (110) and the water temperature sensor (111) are electrically connected with the detection control module (105).
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