CN110274396B - 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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- CN110274396B CN110274396B CN201910575328.9A CN201910575328A CN110274396B CN 110274396 B CN110274396 B CN 110274396B CN 201910575328 A CN201910575328 A CN 201910575328A CN 110274396 B CN110274396 B CN 110274396B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 152
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 109
- 239000001301 oxygen Substances 0.000 claims abstract description 109
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 109
- 238000002485 combustion reaction Methods 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims description 29
- 239000002737 fuel gas Substances 0.000 claims description 23
- 239000000779 smoke Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001131 transforming effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000567 combustion gas Substances 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
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/005—Regulating air supply or draught using electrical or electromechanical means
-
- 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
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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, the fan flow and the excess oxygen content; if the current air flow is not consistent with the preset standard value and the fan flow and the air and excess oxygen content are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to enable the current air flow to be consistent with the preset standard value; and if the current excess oxygen content is not consistent with the preset standard value and the air 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 current excess oxygen content to be 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, the pressure of an air inlet fluctuates, and the external air 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 air flow, the fan flow and the excess oxygen content after the air and the gas are combusted;
if the current air 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 air flow is not consistent with a preset standard value and the fan 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 air flow input by the gas water heater to enable the current air 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 after the current air and the gas are combusted is not consistent with a preset standard value, and the air 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.
Optionally, the method further comprises:
and if the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted are not consistent with the corresponding preset standard values, adjusting the current air flow and the fan flow input by the gas water heater simultaneously, so that the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted are respectively consistent with the corresponding preset standard values.
Optionally, if the current air flow is not consistent with a preset standard value, and the fan 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 air flow input by the gas water heater to make the current air flow consistent with the preset standard value; the specific method comprises the following steps:
and if the current air flow is not consistent with the preset standard value and the fan flow and the excess oxygen content after the air and the fuel gas are combusted are respectively consistent with the corresponding preset standard value, adjusting the opening of a pipeline inputting the current air flow to enable the air flow to be consistent with the preset standard value.
Optionally, if the content of the excess oxygen after the current air and the gas are combusted is not consistent with a preset standard value, and the air flow and the flow of the fan 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 combusted current air and fuel gas is higher than a preset standard value and the air 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 current air and gas are combusted is lower than a preset standard value and the air 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 increased, so that the content of the excess oxygen 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, the gas pipeline is provided with a gas flowmeter, the air pipeline is provided with an air flow adjusting unit, 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 flowmeter, the air flow adjusting unit, the smoke detection device and the anemoscope are respectively electrically connected with the detection control module.
Optionally, the air flow regulating unit further comprises an air proportional valve and an air flow meter, and the air proportional valve and the air flow meter are arranged on the air pipeline; and the air proportional valve and the air flow meter 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 according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a fully premixed gas water heater according to 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.
As shown in fig. 1, a control method for a fully premixed gas water heater according to embodiment 1 of the present invention includes:
starting the gas water heater, and collecting the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted;
if the current air 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 air flow is not consistent with the preset standard value and the fan 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 air flow input by the gas water heater to enable the current air 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 air 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.
After the scheme is adopted, the current air flow, the fan flow and the excess oxygen content of air and fuel gas after combustion are input under the working state of the fuel gas water heater; 1) when the current air 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 air 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, adjusting the current air flow input by the gas water heater to enable the current air 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 when the air flow and the flow of the fan are respectively consistent with the corresponding preset standard values, the current air flow input by the gas water heater is adjusted 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.
Further, the method further comprises:
and if the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted are not consistent with the corresponding preset standard values, adjusting the current air flow and the fan flow input by the gas water heater simultaneously, so that the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted are respectively consistent with the corresponding preset standard values.
Further, if the current air flow is not consistent with a preset standard value and the fan flow and the excess oxygen content after air and gas combustion are respectively consistent with the corresponding preset standard values, adjusting the current air flow input by the gas water heater to enable the current air flow to be consistent with the preset standard value; the specific method comprises the following steps:
and if the current air flow is not consistent with the preset standard value and the fan flow and the excess oxygen content after the air and the fuel gas are combusted are respectively consistent with the corresponding preset standard value, adjusting the opening of a pipeline inputting the current air flow to enable the air flow to be consistent with the preset standard value.
Further, if the content of the excess oxygen after the combustion of the current air and the gas is inconsistent with a preset standard value, and the air flow and the flow of the fan 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 combusted current air and fuel gas is higher than a preset standard value and the air 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 current air and gas are combusted is lower than a preset standard value and the air 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 increased, so that the content of the excess oxygen is consistent with the preset standard value;
further, the detection method of the excess oxygen content comprises the following steps:
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
The air-fuel ratio is configured according to a combustion reaction formula (the following formula) by taking natural gas as a reference, and the excess oxygen content (alpha) is 5-10 percent:
CH4+2O2＝CO2+2H2O+ΔH
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 memory of the gas water heater;
thirdly, assuming that the thermal load interval of the gas water heater is [ QL, QH ], the adjusting interval corresponding to the fan 102 is [ PL1, PH1 ]; the air proportional valve 1081 regulates the interval [ PL3, PH3 ].
Setting an initial value: taking an initial value Q0∈[QL，QH]At this time, P1 is corresponded0∈[PL1，PH1]，P30∈[PL3，PH3]
Step S2: initialization
Electrifying the gas water heater, electrifying the gas water heater for self-detection, and detecting whether each part of components normally work or not through a controller;
and secondly, loading the data prepared in the first step, and initializing the set data to hardware.
(iii) passing Q0Calculating gas flow q10And the air flow rate is converted into the air flow rate according to the stoichiometric equivalent and the excess oxygen alpha, and the air flow rate is q20；
Fourthly, q10、q20Determining a fan flow and a regulation value P1 for fan 1020；
Controlling the air flow through an air proportional valve 1081 and the smoke detection device 103 until the system runs stably;
and sixthly, the flow of the fan is controlled by the fan 102 and the anemograph 106 to adapt to the external pressure, so that the heat load of the gas water heater is accurately controlled until the system runs stably.
Step S3: detecting, collecting data and operating
Collecting data (mainly comprising heat load, opening degree of an air proportional valve 1081, control parameters of a fan 102, excess oxygen content and the like), and collecting Q, P1, P3, q1, q2, alpha and v;
② when other parameters are unchanged and q2 is changed (caused by pipe network pressure change, etc.)
If q2 becomes greater, indicating that inlet air pressure is greater, air proportional valve 1081 is adjusted smaller;
if q2 becomes smaller, indicating that the wellhead air pressure becomes smaller, then air proportional valve 1081 is adjusted larger;
if q2 is not changed, go to (iv);
③ when other parameters are not changed and alpha is changed (caused by air inlet pressure change)
If alpha is larger, the back pressure is smaller, and the air proportional valve 1081 is adjusted to be smaller;
if alpha becomes smaller, indicating that the back pressure becomes larger, the air proportional valve 1081 is adjusted larger;
if alpha is not changed, entering the fourth step;
iv when other parameters are unchanged and v is changed (caused by change of back pressure)
If v is larger, which indicates that the back pressure is smaller, the fan flow of the fan 102 is reduced;
if v becomes smaller, which indicates that the back pressure becomes larger, the fan flow of the fan 102 is increased;
if v is not changed, entering into (iv);
and when other parameters are unchanged, changing the load (setting and adjusting by a user).
Calculating gas flow Q1 'through Q, calculating air flow Q2' according to a chemical reaction formula and the excess oxygen content (alpha), and accurately controlling the air flow through an air proportional valve 1081 and an air flow meter 1082;
determining a fan flow and a regulating value P1 ' through q1 ' and q2 ';
the air flow is accurately controlled through the air proportional valve 1081 and the smoke detection device 103, so that the gas flow is indirectly controlled;
the flow of the fan is controlled by the adjusting value P1' of the fan 102 and the anemometer 106, so that the heat load of the gas water heater is accurately controlled and the external pressure is adapted;
until combustion is smooth.
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 the content of excess oxygen 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 flowmeter 107 is arranged on the gas pipeline 1041, an air flow adjusting unit 108 is arranged on the air pipeline 1042, the gas pipeline 1041 and the air pipeline 1042 are respectively communicated with a fan 102, the fan 102 is also communicated with the burner 100, the combustor 100 is communicated with a 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 flowmeter 107, the air flow adjusting unit 108), the smoke detecting device 103 and the anemometer 106 are electrically connected with the detection control module 105 respectively.
The fan 102 is preferably a direct current fan
Further, the air flow rate adjusting unit 108 further comprises an air proportional valve 1081 and an air flow meter 1082, wherein the air proportional valve 1081 and the air flow meter 1082 are disposed on the air pipe 1042; air proportional valve 1081 and air flow meter 1082 are both electrically connected to test control module 105.
Further, a passive impeller (109) for guiding the air flow is further included, and the passive impeller (109) is arranged on a pipeline of the mixing pipeline 104 communicated with the fan 102.
Further, a water regulating valve 110 is arranged at the water inlet end of the heat exchanger 101, a water temperature sensor 111 is further arranged at the water outlet end of the heat exchanger, and the water regulating valve 110 and the water temperature sensor 111 are both electrically connected with the detection control module 105.
By adopting the gas water heater with the structure, when the gas water heater is used, 1) if the current air flow, the fan flow and the excess oxygen content of the combusted air and gas are consistent with the corresponding preset standard values, the gas water heater does not carry out load control; 2) when the current air 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 fuel gas are combusted are consistent, the air flow is consistent with the preset fuel gas flow by adjusting the opening degree of an air proportional valve 1081 arranged on the current air pipeline 1042; 3) 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; 4) if the content of the excess oxygen after the combustion of the current air and the fuel gas is higher than the corresponding preset standard values, and the air 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 reducing the opening of an air proportional valve 1081 arranged on the current air pipeline 1042; if the content of the excess oxygen after the combustion of the current air and the fuel gas is lower than the corresponding preset standard values, and the air 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 1081 arranged on the 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.
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.
Since the gas and the air are determined according to the chemical reaction equivalent and the excess oxygen content (α) (preferably 5% to 10%), the flow rate of the gas and the air can be determined when the load is constant; the gas directly enters a combustion system from a pipe network, and the gas flow is indirectly controlled through an air proportional valve 1081, a gas flow meter 107 and a motor of the fan 102 (a PID control method); air flow is precisely controlled (PID) by air proportional valve 1081 and air flow meter 1082 as air inlet pressure varies;
after being fully mixed by the passive impeller 109, the fuel gas and the air enter the combustor 100 through the pressurization of the fan 102; the fan 102 is used for pressurizing a gas and air mixture and controlling a combustion load; the flow rate of the fan is determined by the heat load (which can be converted into the gas flow rate) and the excess oxygen content alpha (which can be 5-10%); after the gas combustion passes through the heat exchanger, the gas is discharged outside through the smoke detection device 103 and the anemometer 106.
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 excess oxygen content α changes, the excess oxygen content (α) is controlled by indirect control of the flue gas detection device 103, the air proportional valve 1081, and the gas flow meter 1082.
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 air flow, the current fan flow and the current excess oxygen content after the air and the gas are combusted;
if the current air 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 air flow is not consistent with a preset standard value and the fan 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 air flow input by the gas water heater to enable the current air 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 the gas are combusted is not consistent with a preset standard value, and the air 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;
and if the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted are not consistent with the corresponding preset standard values, adjusting the current air flow and the fan flow input by the gas water heater simultaneously, so that the current air flow, the fan flow and the excess oxygen content after the air and the gas are combusted are respectively consistent with the corresponding preset standard values.
2. The control method of a fully premixed gas water heater according to claim 1, wherein if the current air flow is not consistent with the preset standard value and the fan flow and the excess oxygen content after the air and gas are combusted are respectively consistent with the corresponding preset standard values, the current air flow input by the gas water heater is adjusted so that the current air flow is consistent with the preset standard value; the specific method comprises the following steps:
and if the current air flow is not consistent with the preset standard value and the fan flow and the excess oxygen content after the air and the fuel gas are combusted are respectively consistent with the corresponding preset standard value, adjusting the opening of a pipeline inputting the current air flow to enable the air flow to be consistent with the preset standard value.
3. The control method of a fully premixed gas water heater as claimed in 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 air 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 combusted current air and fuel gas is higher than a preset standard value and the air 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 air 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 method of claim 4, wherein the step of turning on the gas water heater and collecting the current air flow input and the excess oxygen output 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.
6. A fully premixed gas water heater applying the control method of any one of claims 1 to 5, comprising a burner (100) for generating energy, a heat exchanger (101) for outputting heat, a fan (102) for transforming 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 flowmeter (107) is arranged on the gas pipeline (1041), an air flow regulating unit (108) is arranged on the air pipeline (1042), the gas pipeline (1041) and the air pipeline (1042) are respectively communicated with the fan (102), and the fan (102) is also communicated with the burner (100), the combustor (100) is communicated with a 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 flowmeter (107), the air flow adjusting unit (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 air flow regulating unit (108) further comprises an air proportional valve (1081) and an air flow meter (1082), said air proportional valve (1081) and air flow meter (1082) being arranged on the air duct (1042); and the air proportional valve (1081) and the air flow meter (1082) are 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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