CN108278632B - Control device and method for gas-fired machine and gas water heater - Google Patents
Control device and method for gas-fired machine and gas water heater Download PDFInfo
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- CN108278632B CN108278632B CN201810050049.6A CN201810050049A CN108278632B CN 108278632 B CN108278632 B CN 108278632B CN 201810050049 A CN201810050049 A CN 201810050049A CN 108278632 B CN108278632 B CN 108278632B
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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
- F23N1/007—Regulating fuel supply using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/04—Heating water
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Regulation And Control Of Combustion (AREA)
Abstract
The invention provides a control device and a control method for a machine burning by using gas and a gas water heater, and belongs to the technical field of control of machines burning by using gas. The control apparatus includes: receiving means for receiving the temperature and the thermal load of a catalytic module of said gas fired machine; and a gas valve control device for controlling an opening degree of a gas valve according to the temperature of the catalyst module and the thermal load. The invention controls the opening degree of the gas valve according to the temperature and the heat load of the catalytic module, improves the heat efficiency while reducing the emission of harmful gases, and ensures the heat efficiency and low-nitrogen emission.
Description
Technical Field
The present invention relates to a control technique of a machine that burns with gas, and particularly to a control apparatus and method of a machine that burns with gas, and a gas water heater.
Background
Natural gas is a cleaner energy source than coal and oil, but the conventional diffusion combustion method still generates a large amount of Nitrogen Oxides (NO)x) And carbon monoxide (CO). Clean combustion of natural gas has become a subject of common attention in the fields of energy and environmental protection, and strict NO is established and implemented in countries around the worldxEmission regulations, one of the best concern of the general public is CO color change. Solving the problems of CO and NO of a gas water heaterxThe problem of high emission is imminent, and is one of the key factors for restricting the smooth market entry.
According to the pairs of CO and NOxThere are two main types of clean combustion technologies at present, leading to the understanding of the mechanism: the first is dense-thin flame combustion, and the second is full-premix surface combustion.
The combustion of the thick and thin flame focuses on reasonably distributing the thin flame and the thick flame in space and reducing the local high-temperature area to reduce the thermal NOxWhile the rich flame can be post-combusted in the lean burn region to reduce the CO concentration. The combustion of the thick and thin flame has the disadvantages that the shape of the flame is greatly influenced by power, the thick and thin combustion is difficult to realize in the full power range without dynamically changing the size and the angle of a combustion hole, the air-fuel ratio is required to be controlled very accurately, and the requirements on a control system and a structure are higher.
The full-premixing surface combustion can be realized by spraying out from metal fiber micropores and igniting, has small local high-temperature area and NOxThe produced amount is low, and the molecular level mixing of air and fuel gas ensures that the produced amount of CO is little. The defects of the full-premixing surface combustion are that the requirement on the premixing technology is high, partial fire or partial long flame is possible due to incomplete premixing, the surface fiber pore channel is narrow and easy to be blocked by dust, hot spots can be generated after the blockage to burn out metal fibers, the overall control and maintenance cost is high, in addition, the requirement on the air-fuel ratio is high, and the system is not easy to control.
The prior art scheme has the following disadvantages: 1. the thick and thin combustion mode can only effectively reduce NOxThe emission of CO cannot be reduced; 2. after the flue gas is generated by combustion, CO is reduced in a catalytic degradation mode, which can result in NOx(ii) is increased; 3. the method of degradation by subsequent catalysis is a remedy which is eliminated after it has been produced and cannot be controlled from the source.
Disclosure of Invention
The invention aims to provide a control device and a control method of a machine for burning by using gas and a gas water heater, which are used for solving the problem of reducing harmful gas emission and improving heat efficiency.
In order to achieve the above object, the present invention provides a control apparatus of a machine that performs combustion with gas, the control apparatus including: receiving means for receiving the temperature and the thermal load of a catalytic module of said gas fired machine; and a gas valve control device for controlling an opening degree of a gas valve according to the temperature of the catalyst module and the thermal load.
Optionally, the control apparatus further comprises: the processing device is used for judging whether the temperature of the catalytic module is in a preset temperature range or not; and an ignition device for igniting the burner to heat the catalytic module to operate the catalytic module when the temperature of the catalytic module is less than the lower limit value of the temperature range; wherein the gas valve control means is further configured to decrease the opening degree of the gas valve in a case where the temperature of the catalytic module is greater than an upper limit value of the temperature range.
Optionally, the processing device is further configured to determine whether the heat load is in a standard gas load range; and the gas valve control means is also configured to increase the opening degree of the gas valve in a case where the heat load is smaller than a lower limit value of the standard gas load range.
Optionally, the control apparatus further comprises: the fan control module is used for increasing the fan speed under the conditions that the heat load is smaller than the lower limit value of the standard gas load range, the fan speed of the machine combusting the fuel gas is larger than a preset wind speed value, and the fan current of the machine combusting the fuel gas is smaller than a preset current value; the receiving device is further used for receiving the fan speed and the fan current; the gas valve control device is also used for increasing the opening degree of the gas valve when the heat load is smaller than the lower limit value of the standard gas load range and the fan current is not smaller than the preset current value.
Correspondingly, the invention also provides a gas water heater, comprising: a catalytic module for catalytic combustion; a thermocouple module for detecting a temperature of the catalytic module; the water inlet temperature detection device is used for detecting the water inlet temperature of the gas water heater; the water outlet temperature detection device is used for detecting the water outlet temperature of the gas water heater; the water flow detection device is used for detecting the water flow of the gas water heater in unit time; the calculating device is used for calculating the heat load according to the inlet water temperature, the outlet water temperature and the water flow of the gas water heater; the fan wind speed detection device is used for detecting the fan wind speed of the gas water heater; the current detection device is used for detecting the current of the gas water heater; and a control device of a machine for combustion with gas according to what has been described above; wherein the gas-fired machine is the gas water heater.
Optionally, the thermocouple module indirectly obtains the temperature of the catalytic module by detecting the temperature of a high-temperature heat conduction material pre-embedded in the catalytic module.
Correspondingly, the invention also provides a control method of the machine for combustion by using the gas, which comprises the following steps: receiving a temperature and a heat load of a catalytic module of the gas fired machine; and controlling the opening of the gas valve in accordance with the temperature of the catalytic module and the thermal load.
Optionally, the control method further includes: judging whether the temperature of the catalytic module is in a preset temperature range or not; igniting a burner to heat the catalytic module to operate the catalytic module if the temperature of the catalytic module is less than the lower limit of the temperature range; and reducing the opening degree of the gas valve in a case where the temperature of the catalyst module is greater than an upper limit value of the temperature range.
Optionally, the control method further includes: judging whether the heat load is in a standard gas load range or not; and increasing the opening degree of the gas valve in the case where the heat load is smaller than the lower limit value of the standard gas load range.
Optionally, the control method further includes: receiving the fan speed and the fan current; under the conditions that the heat load is smaller than the lower limit value of the standard gas load range, the fan wind speed of the machine combusting with the fuel gas is larger than a preset wind speed value, and the fan current of the machine combusting with the fuel gas is smaller than a preset current value, the fan wind speed is increased; and increasing the opening degree of the gas valve in the case where the heat load is less than the lower limit value of the standard gas load range and the fan current is not less than the predetermined current value.
Through the technical scheme, the opening degree of the gas valve is controlled according to the temperature and the heat load of the catalytic module, so that the heat efficiency is improved while the emission of harmful gases is reduced, and the heat efficiency and low-nitrogen emission are ensured.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a block diagram of a control device for a gas-fired machine according to the present invention;
FIG. 2 is a control flow diagram of a catalytic module provided by the present invention;
FIG. 3 is a flow chart of the present invention for adjusting the opening of a gas valve based on thermal load; and
fig. 4 is a flowchart of a method for controlling a gas-fired combustion device according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram of a control apparatus of a gas-fired machine according to the present invention, as shown in fig. 1, the control apparatus includes a receiving device 101 and a gas valve control device 102, the receiving device 101 is used for receiving a temperature and a heat load of a catalytic module of the gas-fired machine; the gas valve control device 102 is used to control the opening of the gas valve according to the temperature and thermal load of the catalytic module.
The temperature of the catalytic module is too low or too high, the catalytic module can not work, the catalytic module can be heated by igniting the burner under the condition that the temperature of the catalytic module is too low, the gas volume is too much under the condition that the temperature of the catalytic module is too high, and the temperature of the catalytic module can be reduced by reducing the opening degree of the gas valve in a mode of reducing the gas volume.
The thermal load refers to the amount of heat released per unit time when the fuel is burned in the burner, and generally, it is desirable to increase the thermal load as much as possible, that is, the higher the thermal load, the better, and in the case of the thermal load being too low, that is, the thermal efficiency is too low, which may be caused by too little gas, and if so, the thermal efficiency of the machine can be ensured by increasing the gas amount by increasing the opening degree of the gas valve.
It will be appreciated by those skilled in the art that in existing gas fired machines, catalytic modules are employed in which a precious metal is used as a catalyst for the burner to achieve flameless catalytic combustion. The combustible is burnt under the action of the catalyst, and compared with direct combustion, the catalytic combustion temperature is lower, and NO is effectively inhibitedxThe catalytic combustion is complete, and the content of CO in the flue gas can be greatly reduced, so that the emission of harmful gases is effectively reduced. In the catalytic combustion process, the catalyst has the functions of reducing the ignition temperature of the fuel, deepening the oxidation degree of the fuel, enabling organic matters to undergo flameless combustion under the condition of lower ignition temperature, and carrying out oxidative decomposition to obtain a combustion end product CO2And H2O, releasing a large amount of heat, and enriching reactant molecules on the surface of the catalyst so as to improve the reaction rate and the fuel utilization rate.
The catalyst is preferably noble metal, the surface of the burner is coated with the noble metal, the ignition temperature can be reduced to 350 ℃ under the action of the noble metal, the temperature of a burner fire hole is effectively reduced, and NO is inhibitedxWhile the catalyst can oxidize CO to CO2Thereby achieving the purpose of reducing the emission of harmful gases.
The current relatively consistent view is as follows: on the surface of a noble metal catalyst, CH4And O2Firstly, the catalyst is adsorbed and activated on the surface of the catalyst, and dissociated into methyl or methylene, which reacts with adsorbed oxygen or directly generates CO2And H2O, or form chemisorbed HCHO and HCHO, or from noble metalsSurface desorption and reaction with adsorbed oxygen to produce CO2And H2And O. HCHO is generally considered as an intermediate species that, once produced, rapidly decomposes into CO and H2And desorption into the gas phase in the form of HCHO molecules is not possible.
The dynamic behavior of catalytic chemical reactions is the core of the study of catalytic combustion mechanisms. The catalytic reaction is a physicochemical process as a whole. The physical properties of the catalytic surface also have a very important influence on the catalytic chemodynamic behavior.
The adoption of a catalytic module in a machine for combustion with a gas and the use of a noble metal as a catalyst in the catalytic module are techniques commonly used in the art, and the principle thereof is not described herein in detail.
The control equipment of the machine for burning the fuel gas further comprises a processing device and an ignition device, wherein the processing device is used for judging whether the temperature of the catalytic module is in a preset temperature range or not; the ignition device is used for igniting the combustor to heat the catalytic module under the condition that the temperature of the catalytic module is smaller than the lower limit value of the temperature range so as to enable the catalytic module to work; wherein the gas valve control device is further configured to reduce the opening degree of the gas valve in a case where the temperature of the catalytic module is greater than the upper limit value of the temperature range.
Generally speaking, the temperature range can be set to 650 ℃ to 1100 ℃, the catalytic module can normally work when the temperature is 650 ℃ to 1100 ℃, and can not normally work when the temperature is not 650 ℃ to 1100 ℃, so in order to ensure the normal work of the catalytic module, the ignition device ignites the burner to heat the catalytic module when the temperature is too low (such as less than 650 ℃), and the gas valve control device reduces the opening degree of the gas valve when the temperature is too high (such as more than 1100 ℃), so that the gas amount is reduced, and the purpose of reducing the temperature of the catalytic module is achieved.
The machine that burns with gas starts, when detecting rivers (the detection of rivers signal is this field conventional technology), start the fan and clean waste gas, then ignite (generally ignition ignites), open the gas circuit and carry out full premix mode burning earlier, flame detection adopts the mode that detects flame ion (utilize flame ion detector) during full premix mode burning, the heat that the burning produced preheats catalytic module, think that catalytic module begins to work when catalytic module's temperature reaches preset temperature range, the flame ion quantity diminishes this moment, catalytic module gets into catalytic combustion mode.
FIG. 2 is a control flow diagram of a catalytic module provided by the present invention, as shown in FIG. 2, the flow diagram including:
In step 205, the gas flow is reduced to lower the temperature of the catalytic module, wherein the gas flow is reduced by reducing the opening of the gas valve.
In the technical scheme described above, if the ignition of the ignition device is unsuccessful twice, an alarm is given through the alarm device, wherein the unsuccessful ignition is judged through the flame ion detector, and the ignition is judged to be successful under the condition that the flame ion detector detects flame ions, otherwise, the ignition is judged to be unsuccessful. Further, in the case where the temperature of the catalyst module is not within the preset temperature range, if it is considered that the gas path supply air is abnormal or the fan supply air is abnormal, the alarm device may give an alarm and may close the gas valve (this operation may be performed by the gas valve control device).
Wherein the processing device is further configured to determine whether the thermal load is within a standard gas load range; the gas valve control means is also for increasing the opening degree of the gas valve in the case where the thermal load is less than the lower limit value of the standard gas load range.
Generally, if the heat load is not in the standard gas load range, when the wind speed of the fan is high and the current of the fan is reduced, the external backflow wind or the blocking of the exhaust channel can be considered, at this time, the wind speed can be increased to enable the current of the fan to reach a specified value, but if the wind speed of the fan and the current of the fan are both in the standard range and the heat load is still low (namely, the wind speed of the fan is not in the standard gas load range, namely, the wind speed of the fan is lower than the lower limit value of the standard gas load range), the heat value of the gas can be considered to be insufficient or the pressure of the primary gas supply is insufficient, the opening degree of the gas valve can be increased to increase the gas output amount and ensure.
Therefore, the control equipment for the machine combusting by using the fuel gas further comprises a fan control module, a fan control module and a control module, wherein the fan control module is used for increasing the fan speed under the conditions that the heat load is smaller than the lower limit value of the standard gas load range, the fan speed of the machine combusting by using the fuel gas is larger than a preset wind speed value, and the fan current of the machine combusting by using the fuel gas is smaller than a preset current value; the receiving device is also used for receiving the wind speed and the current of the fan; the gas valve control means is also for increasing the opening degree of the gas valve in the case where the heat load is less than the lower limit value of the standard gas load range and the fan current is not less than the predetermined current value.
Since the heat load is generally considered to be as high as possible, only the case where the heat load is less than the lower limit value of the standard gas load range is considered in the present invention. For the judgment of high wind speed of the fan and the reduction of the current of the fan, a technician can set a judgment rule according to the actual condition, the high wind speed of the fan is determined by judging that the wind speed of the fan is greater than the preset wind speed, and the reduction of the current of the fan is determined by judging that the current of the fan is less than a preset current value. Of course, the present invention is not limited thereto, and the technician may set the strategy for determining the fan current drop based on experience.
The above-described gas valve control apparatus performs the reduction of the opening degree of the gas valve and the increase of the opening degree of the gas valve based on preset standard values, and generally, the characteristic values include the temperature of the catalyst module, the wind speed of the fan, and the thermal load, and determines the opening degree of the gas valve based on these several characteristic values when the opening degree of the gas valve needs to be adjusted, thereby determining the adjustment value of the opening degree of the gas valve. It should be understood by those skilled in the art that the temperature of the catalytic module, the wind speed of the fan, the thermal load and the opening degree of the gas valve corresponding to these characteristic values may be stored in advance through a table, and when the opening degree of the gas valve needs to be adjusted, the corresponding opening degree of the gas valve is obtained through the characteristic values of the respective characteristics in the table, and generally, the characteristic value is a range value, but the present invention is not limited thereto, and the skilled person may set the characteristic value and the opening degree of the gas valve corresponding thereto according to actual situations. The present invention is not limited to this, and the opening degree adjustment value of the gas valve, that is, a fixed value, may be adjusted, that is, increased or decreased, each time the opening degree of the gas valve is adjusted, and the final object, that is, the desired heat load, may be achieved by adjusting a plurality of times.
Fig. 3 is a flow chart for adjusting the opening of the gas valve according to the thermal load according to the present invention, and as shown in fig. 3, the flow chart includes:
In step 303, it is determined whether the heat load calculated in step 302 is smaller than the lower limit of the standard air load range (the upper limit of the standard air load is not considered in the present invention), if yes, step 304 is executed, and if no, step 301 is executed again, that is, no operation is performed.
In step 304, it is determined whether the fan current is smaller than a predetermined current value, if yes, step 305 is executed, and if no, step 306 is executed.
And 305, increasing the wind speed of the fan.
Correspondingly, the invention also provides a gas water heater, comprising: a catalytic module for catalytic combustion; the thermocouple module is used for detecting the temperature of the catalytic module; the water inlet temperature detection device is used for detecting the water inlet temperature of the gas water heater; the water outlet temperature detection device is used for detecting the water outlet temperature of the gas water heater; the water flow detection device is used for detecting the water flow of the gas water heater in unit time; the calculating device is used for calculating the heat load according to the inlet water temperature, the outlet water temperature and the water flow of the gas water heater; the fan wind speed detection device is used for detecting the fan wind speed of the gas water heater; the current detection device is used for detecting the current of the gas water heater; and a control device of a machine for combustion with gas according to what has been described above; wherein, the machine which burns by using gas is a gas water heater.
Wherein, in order to avoid the pyrometry of thermocouple, improve the life-span of thermocouple, can be at the inside pre-buried high temperature heat conduction material's of catalysis module mode, adopt the thermocouple to measure the temperature of heat conduction material and then outside the module, calculate the temperature of catalysis module. That is to say, the thermocouple module obtains the temperature of catalysis module indirectly through detecting the temperature of the high temperature heat conduction material of pre-buried inside catalysis module.
Fig. 4 is a flowchart of a method for controlling a gas-fired machine according to the present invention, as shown in fig. 4, the method including:
in step 402, the opening of the gas valve is controlled based on the temperature and thermal load of the catalytic module.
It should be noted that the specific details and advantages of the control method for a gas-fired machine according to the present invention are similar to those of the control apparatus for a gas-fired machine according to the present invention, and are not described herein again.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
The invention adopts a flameless catalytic combustion mode to control CO and NO from the sourcexThe traditional flame combustion mode is changed, and the noble metal is used as the catalyst of the combustor to realize flameless catalytic combustion. The combustible is burnt under the action of the catalyst, and compared with direct combustion, the catalytic combustion temperature is lower, and NO is effectively inhibitedxThe generation of the catalyst is complete, and the content of CO in the flue gas is reduced, so that the emission of harmful gases is effectively reduced. In the catalytic combustion process, the catalyst is used for reducing the ignition temperature of the fuel and deepening the oxidation degree of the fuel, so that organic matters are subjected to flameless combustion under the condition of lower ignition temperature and are oxidized and decomposed into combustion final products CO2And H2O, releasing a large amount of heat, and enriching reactant molecules on the surface of the catalyst so as to improve the reaction rate and the fuel utilization rate.
The invention judges the working state of the catalytic module by measuring the temperature by the thermocouple, can safely control the working state of the module, improves the reliability of the system, and can automatically improve the heat load when the gas supply pressure is low or the heat value of the gas is low, thereby ensuring the heat efficiency and low nitrogen emission.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (4)
1. A control device for a machine for combustion with gas, characterized in that it comprises:
receiving means for receiving the temperature and the thermal load of a catalytic module of said gas fired machine; and
a gas valve control device for controlling an opening degree of a gas valve according to a temperature of the catalytic module and the thermal load;
the processing device is used for judging whether the temperature of the catalytic module is in a preset temperature range or not; and
the ignition device is used for igniting the combustor to heat the catalytic module under the condition that the temperature of the catalytic module is smaller than the lower limit value of the temperature range so as to enable the catalytic module to work;
wherein the gas valve control means is further configured to decrease the opening degree of the gas valve in a case where the temperature of the catalytic module is greater than an upper limit value of the temperature range;
the processing device is also used for judging whether the heat load is in a standard gas load range; and
the gas valve control device is also used for increasing the opening degree of the gas valve when the heat load is smaller than the lower limit value of the standard gas load range;
the control apparatus further includes:
the fan control module is used for increasing the fan speed under the conditions that the heat load is smaller than the lower limit value of the standard gas load range, the fan speed of the machine combusting the fuel gas is larger than a preset wind speed value, and the fan current of the machine combusting the fuel gas is smaller than a preset current value;
the receiving device is further used for receiving the fan speed and the fan current;
the gas valve control device is also used for increasing the opening degree of the gas valve when the heat load is smaller than the lower limit value of the standard gas load range and the fan current is not smaller than the preset current value.
2. A gas water heater, comprising:
a catalytic module for catalytic combustion;
a thermocouple module for detecting a temperature of the catalytic module;
the water inlet temperature detection device is used for detecting the water inlet temperature of the gas water heater;
the water outlet temperature detection device is used for detecting the water outlet temperature of the gas water heater;
the water flow detection device is used for detecting the water flow of the gas water heater in unit time;
the calculating device is used for calculating the heat load according to the inlet water temperature, the outlet water temperature and the water flow of the gas water heater;
the fan wind speed detection device is used for detecting the fan wind speed of the gas water heater;
the current detection device is used for detecting the current of the gas water heater; and
control device of a gas-fired machine according to claim 1;
wherein the gas-fired machine is the gas water heater.
3. The gas water heater of claim 2, wherein the thermocouple module indirectly obtains the temperature of the catalytic module by detecting the temperature of a high-temperature heat-conducting material pre-embedded inside the catalytic module.
4. A method for controlling a machine for combustion with gas, characterized in that it comprises:
receiving a temperature and a heat load of a catalytic module of the gas fired machine; and
controlling an opening of a gas valve according to a temperature of the catalytic module and the thermal load;
judging whether the temperature of the catalytic module is in a preset temperature range or not;
igniting a burner to heat the catalytic module to operate the catalytic module if the temperature of the catalytic module is less than the lower limit of the temperature range; and
reducing the opening degree of the gas valve in a case where the temperature of the catalytic module is greater than an upper limit value of the temperature range;
judging whether the heat load is in a standard gas load range or not; and
increasing the opening degree of the gas valve in a case where the heat load is less than a lower limit value of the standard gas load range;
the control method further comprises the following steps:
receiving the wind speed and current of a fan;
under the conditions that the heat load is smaller than the lower limit value of the standard gas load range, the fan wind speed of the machine combusting with the fuel gas is larger than a preset wind speed value, and the fan current of the machine combusting with the fuel gas is smaller than a preset current value, the fan wind speed is increased; and
and increasing the opening degree of the gas valve under the conditions that the heat load is smaller than the lower limit value of the standard gas load range and the fan current is not smaller than the preset current value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010561301.7A CN111780154B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
| CN202010430082.9A CN111397219B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
| CN201810050049.6A CN108278632B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
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| CN201810050049.6A CN108278632B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
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| CN202010561301.7A Division CN111780154B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
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| CN108278632A CN108278632A (en) | 2018-07-13 |
| CN108278632B true CN108278632B (en) | 2020-07-31 |
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| CN201810050049.6A Active CN108278632B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
| CN202010561301.7A Active CN111780154B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
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| CN109631319A (en) * | 2018-10-17 | 2019-04-16 | 中山市思源电器有限公司 | A kind of energy-saving water heater for the natural gas that burns |
| CN112747476B (en) * | 2020-12-30 | 2022-04-08 | 广东万和新电气股份有限公司 | Control method and control system of water heater and water heater |
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| Publication number | Publication date |
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| CN108278632A (en) | 2018-07-13 |
| CN111397219B (en) | 2021-07-27 |
| CN111397219A (en) | 2020-07-10 |
| CN111780154B (en) | 2023-01-24 |
| CN111780154A (en) | 2020-10-16 |
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Effective date of registration: 20221026 Address after: 241000 west side of 3 / F, No.5 office building, new energy and new materials gathering area, Fuzhou Road, Jiangbei District, Wuhu City, Anhui Province Patentee after: Wuhu Midea intelligent kitchen electricity Manufacturing Co.,Ltd. Address before: 241000 Wanchun East Road, East District, Wuhu Economic and Technological Development Zone, Anhui Province Patentee before: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. |