CN111780154B - 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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- CN111780154B CN111780154B CN202010561301.7A CN202010561301A CN111780154B CN 111780154 B CN111780154 B CN 111780154B CN 202010561301 A CN202010561301 A CN 202010561301A CN 111780154 B CN111780154 B CN 111780154B
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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
Abstract
The invention provides a control device and a control method of a machine for burning by using gas and a gas water heater, and belongs to the technical field of control of machines for 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
RELATED APPLICATIONS
The application is a divisional application of Chinese patent application with the application numbers of 201810050049.6, the application dates of 2018, 01 and 18, and the name of the invention of 'control equipment and method for a machine combusting by using gas and a gas water heater'.
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 world x The common public speaks more about CO color change in the aspect of emission regulations. Solving the problems of CO and NO of a gas water heater x The high discharge problem is imminent and is one of the key factors restricting the smooth market entry.
According to the ratio of CO to NO x The understanding of the mechanism is generated, and at present, two clean combustion technologies are mainly adopted: 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 NO x While 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 NO x The produced amount is low, and the molecular level mixing of air and fuel gas ensures that the produced amount of CO is little. The disadvantage of the full-premixing surface combustion lies in the premixing technologyThe requirements for the height are high, partial fire or partial long flame is possible to occur due to incomplete premixing, surface fiber pore channels are narrow and easy to be blocked by dust, hot spots can be generated after blockage to burn out metal fibers, the overall control and maintenance cost is high, in addition, the requirement for 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 NO x The 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 NO x (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 improving the heat efficiency while reducing the emission of harmful gas.
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 device 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 reduce 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 device 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 means is also configured to increase 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.
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 outlet water temperature detection device is used for detecting the outlet water 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 thermal load of a catalytic module of the gas fired machine; and controlling the opening of the gas valve according to 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 a case where the heat load is less than a 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 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 gas 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 and not to limit 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 device of a gas-fired machine provided by the present invention, and as shown in fig. 1, the control device comprises a receiving device 101 and a gas valve control device 102, wherein the receiving device 101 is used for receiving the temperature and the 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 in general, it is desirable to increase the thermal load as much as possible, that is, the higher the thermal load, the better, and in case the thermal load is 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 may 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 combusted under the action of a catalyst, withCompared with direct combustion, the catalytic combustion temperature is lower, and NO is effectively inhibited x The 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 light-off temperature of the fuel, deepening the oxidation degree of the fuel, enabling organic matters to be subjected to flameless combustion under the condition of lower light-off temperature, and carrying out oxidative decomposition to obtain a combustion end product CO 2 And H 2 O, 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 inhibited x While the catalyst can oxidize CO to CO 2 Thereby achieving the purpose of reducing the emission of harmful gases.
The current relatively consistent opinion is: on the surface of a noble metal catalyst, CH 4 And O 2 Firstly, 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 CO 2 And H 2 O, or HCHO and HCHO chemically adsorbed or desorbed from the surface of noble metal and reacted with adsorbed oxygen to produce CO 2 And H 2 And O. HCHO is generally considered as an intermediate species that, once produced, rapidly decomposes into CO and H 2 And it is impossible to desorb into the gas phase as HCHO molecules.
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, the temperature range can be set to 650 ℃ to 1100 ℃, and the catalytic module can be considered to normally operate when the temperature is 650 ℃ to 1100 ℃ or not 650 ℃ to 1100 ℃, so that in order to ensure the normal operation of the catalytic module, the ignition device ignites the burner to heat the catalytic module when the temperature is too low (for example, lower than 650 ℃), and the gas valve control device reduces the opening degree of the gas valve when the temperature is too high (for example, higher than 1100 ℃) so as to reduce the gas amount, thereby achieving the purpose of reducing the temperature of the catalytic module.
The machine that burns with the gas is started, when detecting rivers (the detection of rivers signal is this area conventional technology), start the fan and clean waste gas, then ignite (generally ignition is igniteed), open the gas circuit and carry out the burning of full premix mode earlier, flame detection adopts the mode that detects flame ion (utilize flame ion detector) during the burning of full premix mode, the heat that the burning produced preheats catalytic module, think catalytic module begins to work when catalytic module's temperature reaches the temperature range of presetting, flame ion quantity becomes less this moment, catalytic module gets into the 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:
Step 204, the catalytic module is heated to increase the temperature of the catalytic module.
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 above-described technical solution, if the ignition device is not successfully ignited twice, an alarm device will give an alarm, where the unsuccessful ignition is determined by the flame ion detector, and the ignition is determined to be successful if the flame ion detector detects flame ions, otherwise the ignition is determined 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 blockage 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, not in the standard gas load range, namely, 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 and ensure the heat efficiency of the machine.
Therefore, the control equipment of the machine which burns by using the fuel gas further comprises a fan control module which is used for increasing the fan speed under the conditions that the heat load is less than the lower limit value of the standard gas load range, the fan speed of the machine which burns by using the fuel gas is greater than the preset wind speed value, and the fan current of the machine which burns by using the fuel gas is less than the 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 adapted to increase 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 thermal load is generally considered to be as high as possible, only the case where the thermal 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 in accordance with preset standard values, and generally, the characteristic values include the catalyst module temperature, the fan wind speed, and the heat 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 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 the actual situation. 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.
And step 306, increasing the opening of the gas valve.
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 water inlet temperature, the water outlet 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 specific details of the above embodiments, and various simple modifications may 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 these 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 source x The 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 inhibited x The 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 CO 2 And H 2 O, releasing a great deal of heat and enriching reactant molecules on the surface of the catalyst so as to improve the reaction rate and the reaction rateFuel utilization.
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 (8)
1. A control device for a machine for combustion with gas, characterized in that it comprises:
the ignition device is used for igniting and opening a gas path to burn in a full-premixing mode so as to preheat the catalytic module;
receiving means for receiving indirectly measured temperature and thermal load of a catalytic module of said gas fired machine;
a gas valve control means for controlling an opening degree of a gas valve in accordance with the indirectly measured temperature of the catalytic module and the heat load, the gas valve control means increasing the opening degree of the gas valve in a case where the heat load is less than a lower limit value of a standard gas load range and a fan current is not less than a predetermined current value; and
a fan control module for controlling the fan to drive the fan,
the receiving device is further used for receiving the wind speed of a fan and the current of the fan, and the fan control module is used for increasing the wind speed of the fan under the conditions that the heat load is smaller than the lower limit value of the standard gas load range, the wind speed of the fan of a machine combusting gas is larger than a preset wind speed value, and the current of the fan of the machine combusting gas is smaller than the preset current value.
2. The control apparatus according to claim 1, characterized in that the control apparatus further comprises:
the flame ion detector is used for detecting the flame ion state during the combustion in a full premixing mode;
the alarm device is used for giving an alarm when the ignition of the ignition device is unsuccessful twice or detecting that the temperature of the catalytic module is not in a preset temperature range; and
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 also 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.
3. The control apparatus of claim 2, wherein the processing device is further configured to determine whether the thermal load is within the standard air load range.
4. A gas water heater, comprising:
a catalytic module for catalytic combustion;
a burner for preheating and heating the catalytic module;
a thermocouple module for indirectly detecting the temperature of the catalytic module; and
a control device of a gas-fired machine according to any one of claims 1 to 3;
wherein, the machine that burns with the gas is gas heater, ignition is used for right the combustor ignites.
5. The gas water heater of claim 4, 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.
6. A method for controlling a machine for combustion with gas, characterized in that it comprises:
combusting in a full premixing mode to preheat the catalytic module;
receiving an indirect measurement of the temperature and heat load of a catalytic module of the gas fired machine;
controlling the opening degree of a gas valve according to the indirectly measured temperature of the catalytic module and the heat load, and increasing the opening degree of the gas valve under the conditions that the heat load is smaller than the lower limit value of a standard gas load range and the fan current is not smaller than a preset current value; and
receiving a fan speed and the fan current; and 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 the preset current value, the fan wind speed is increased.
7. The control method according to claim 6, characterized by further comprising:
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;
when the ignition is detected to be unsuccessful twice, or the temperature of the catalytic module is not within a preset temperature range, alarming is carried out.
8. The control method according to claim 7, characterized by further comprising: and judging whether the heat load is in the standard gas load range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561301.7A CN111780154B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
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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 |
| 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 Division CN108278632B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
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| CN111780154A CN111780154A (en) | 2020-10-16 |
| CN111780154B true CN111780154B (en) | 2023-01-24 |
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| CN202010561301.7A Active CN111780154B (en) | 2018-01-18 | 2018-01-18 | Control device and method for gas-fired machine and gas water heater |
| CN202010430082.9A Active CN111397219B (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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Also Published As
| Publication number | Publication date |
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| CN108278632A (en) | 2018-07-13 |
| CN111397219A (en) | 2020-07-10 |
| CN111397219B (en) | 2021-07-27 |
| CN108278632B (en) | 2020-07-31 |
| CN111780154A (en) | 2020-10-16 |
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