CN115560487A - Gas water heating equipment, control method and device thereof and computer readable storage medium - Google Patents

Abstract

The invention discloses a gas water heating device, a control method and a control device thereof, and a computer readable storage medium, wherein the control method of the gas water heating device comprises the following steps: acquiring the current water inlet temperature of the gas water heating equipment, the current water outlet temperature of the gas water heating equipment and the current water flow of the gas water heating equipment, and determining the current hot water yield of the gas water heating equipment; calculating a difference value between the current hot water yield of the gas water heating equipment and the reference hot water yield of the gas water heating equipment; and when the calculated difference is larger than a preset difference, controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode, and adjusting the flow of mixed gas entering a combustion chamber of the gas water heating equipment under the air-fuel ratio adjusting mode so that the calculated difference is not larger than the preset difference. The invention realizes the energy conservation and emission reduction of the water heater and reduces the emission of pollutants (CO and NOx).

Description

Gas water heating equipment, control method and device thereof and computer readable storage medium

Technical Field

The invention relates to the technical field of water heaters, in particular to a gas water heating device, a control method and a control device thereof and a computer readable storage medium.

Background

High temperature air combustion (high temperature air combustion) is called MILD and deep low oxygen dilution combustion, and is called a novel combustion mode for short, namely MILD combustion. The main characteristics of the combustion are: the chemical reaction mainly takes place in a high-temperature low-oxygen environment, the temperature of the reactants is higher than the autoignition temperature of the reactants, the maximum temperature rise in the combustion process is lower than the autoignition temperature of the reactants, and the volume fraction of oxygen is diluted by combustion products to an extremely low concentration, usually 3-10%. Compared with conventional combustion, in the combustion state, the pyrolysis of fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole hearth is very uniform during the combustion, and the emission of pollutants NOx and CO is greatly reduced.

Although the high-temperature air combustion has the advantages, a proper combustion mode is not automatically selected according to the heat load, and the problems of high energy consumption and low efficiency of the gas water heating equipment easily occur.

Disclosure of Invention

The invention mainly aims to provide a gas water heating device, a control method and a control device thereof, and a computer readable storage medium, aiming at realizing energy conservation and emission reduction of a water heater and reducing emission of pollutants (CO and NOx).

In order to achieve the above object, the present invention provides a control method of a gas-fired water heating apparatus, the control method of the gas-fired water heating apparatus comprising the steps of:

acquiring the water inlet temperature, the water outlet temperature and the water flow of the gas water heating equipment, and determining the current hot water yield of the gas water heating equipment;

calculating a difference value between the current hot water yield of the gas hot water equipment and a preset reference hot water yield; and (c) a second step of,

and when the calculated difference is larger than a preset difference, controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode, and adjusting the flow of mixed gas entering a combustion chamber of the gas water heating equipment in the air-fuel ratio adjusting mode so that the calculated difference is not larger than the preset difference.

Optionally, when the calculated difference is greater than a preset difference, the step of controlling the gas-fired water heating apparatus to enter an air-fuel ratio adjustment mode specifically includes:

and adjusting the opening degree of a gas valve of the gas water heating equipment to adjust the gas flow output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

Optionally, when the calculated difference is greater than a preset difference, the step of controlling the gas-fired water heating apparatus to enter an air-fuel ratio adjustment mode specifically includes:

and adjusting the rotating speed of a fan of the gas water heating equipment to adjust the air flow output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

Optionally, the gas water heating equipment further comprises a fan and a premixing chamber communicated with the combustion chamber of the gas water heating equipment, the premixing chamber comprises a gas inlet, an air inlet and a mixed gas outlet, the mixed gas outlet is communicated with the gas inlet and the air inlet to form a mixed gas channel, and the fan is arranged in the mixed gas channel;

when the calculated difference is greater than the preset difference, the step of controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode specifically comprises the following steps:

and adjusting the rotating speed of the fan to adjust the flow of the mixed gas output to the combustion chamber until the adjusted difference value is less than or equal to a preset difference value.

Optionally, the gas water heating equipment comprises a preheating burner and a high-temperature air burner which is connected into high-temperature flue gas formed by burning of the preheating burner so as to generate high-temperature air burning; the gas water heating equipment also comprises a gas supply assembly which is used for supplying gas to the combustion chamber where the preheating burner is located and the combustion chamber where the high-temperature air burner is located;

when the calculated difference is greater than a preset difference, the step of controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode specifically comprises the following steps:

and controlling the air feeding assembly to adjust the flow of the fuel gas and/or air output to the combustion chamber where the high-temperature air burner is located.

Optionally, after the step of calculating the difference between the current hot water production rate of the gas water heating device and the reference hot water production rate of the gas water heating device, the method further comprises:

and when the calculated difference is less than or equal to a preset difference, controlling the gas water heating equipment to maintain the current working mode.

Optionally, the step of obtaining the current water inlet temperature of the gas water heating device, the current water outlet temperature of the gas water heating device, and the current water flow rate of the gas water heating device, and determining the current hot water yield of the gas water heating device specifically includes:

calculating the temperature difference between the current water inlet temperature of the gas water heating equipment and the current water outlet temperature of the gas water heating equipment;

and calculating the product of the temperature difference and the current water flow of the gas water heating equipment to obtain the current hot water yield of the gas water heating equipment.

The invention also provides a gas water heating equipment control device which is characterized by comprising a processor, a memory and a gas water heating equipment control program which is stored on the memory and can run on the processor; wherein the gas water heater control program, when executed by the processor, implements the steps of the method of controlling a gas water heater as described above.

The invention also provides a gas water heating device, which is provided with a cold water inlet pipe and a hot water outlet pipe, and is characterized by comprising the following components:

a burner having a combustion chamber formed therein;

and the gas water heating equipment control device is used for controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode when the difference value between the current hot water yield of the gas water heating equipment and the preset hot water yield is larger than the preset difference value.

Optionally, the gas-fired water heating apparatus further comprises:

a high temperature air burner installed in the combustion chamber;

a preheating burner installed in the combustion chamber and disposed adjacent to the high temperature air burner.

Optionally, the gas hot water apparatus further comprises an air supply assembly communicated with the combustion chamber, and the air supply assembly supplies gas to the combustion chamber where the preheating burner is located and to the combustion chamber where the high-temperature air burner is located respectively when the air supply assembly works.

Optionally, the gas-fired water heating apparatus further comprises:

and one end of the heat exchanger is communicated with the cold water inlet pipe, the other end of the heat exchanger is communicated with the hot water outlet pipe, and the heat exchanger is used for absorbing heat generated by combustion of the burner and exchanging the absorbed heat with water in the heat exchanger.

The present invention also provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium stores a gas-fired water heating apparatus control program, and the gas-fired water heating apparatus control program, when executed by a processor, implements the steps of the control method of the gas-fired water heating apparatus as described above.

The method comprises the steps of obtaining the current water inlet temperature of the gas water heating equipment, the current water outlet temperature of the gas water heating equipment and the current water flow of the gas water heating equipment, determining the current hot water yield of the gas water heating equipment, calculating the difference value between the current hot water yield of the gas water heating equipment and the preset reference hot water yield, controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode when the calculated difference value is larger than the preset difference value, and adjusting the flow of mixed gas entering a combustion chamber of the gas water heating equipment under the air-fuel ratio adjusting mode so that the calculated difference value is not larger than the preset difference value. According to the invention, the current hot water yield of the gas water heating equipment is obtained through real-time detection, and the state of the gas water heating equipment is analyzed according to the current hot water yield and the target benchmark hot water yield, so that the corresponding actions of the fan and the gas proportional valve are controlled, closed-loop control is realized, and the gas water heating equipment can be ensured to run in a better efficiency state during combustion.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow chart illustrating an embodiment of a method for controlling a gas-fired water heating apparatus according to the present invention;

FIG. 2 is a schematic flow chart illustrating a detailed process of step 300 in FIG. 1;

FIG. 3 is a schematic flow chart illustrating another embodiment of step 300 in FIG. 1;

FIG. 4 is a schematic flow chart illustrating another embodiment of step 300 in FIG. 1;

FIG. 5 is a flowchart illustrating an embodiment of step 300 of FIG. 1;

FIG. 6 is a schematic flow chart illustrating another embodiment of a method for controlling a gas-fired water heating apparatus according to the present invention;

FIG. 7 is a schematic view of a detailed flow chart of an embodiment of step 200 in FIG. 1;

FIG. 8 is a schematic structural view of an embodiment of the gas-fired water heating apparatus of the present invention;

FIG. 9 is a schematic structural view of another embodiment of the gas-fired water heating apparatus of the present invention;

FIG. 10 is a schematic view of the structure of an embodiment of the burner of FIG. 9;

FIG. 11 is a functional block diagram of an embodiment of a gas-fired water heating apparatus;

fig. 12 is a schematic terminal structure diagram of a hardware operating environment of a gas water heater control device according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name(s)	Reference numerals	Name(s)
				100	Burner with a burner head	510	Fan blower
110	High-temperature air burner	520	Gas-guide tube
				120	Preheating burner	530	Air duct
130	Air inlet cavity	540	Gas proportional valve
				140	Flame induction device	A2	Water flow sensor
150	Ignition device	T11	Inlet water temperature sensor
				200	Heat exchanger	T12	Water outlet temperature sensor
300	Smoke exhaust pipe	10	Cold water inlet pipe
				400	Exhaust fume collecting hood	20	Hot water outlet pipe
500	Air supply assembly
				600	Condensed water collector

The implementation, functional features and advantages of the object of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a control method of gas water heating equipment.

The gas water heating equipment comprises a preheating burner and a high-temperature air burner which is connected into high-temperature flue gas formed by burning of the preheating burner so as to generate high-temperature air burning. High temperature air combustion (high temperature air combustion) is called MILD and deep low oxygen dilution combustion, and is called a novel combustion mode for short, namely MILD combustion. The main characteristics of the combustion are as follows: the chemical reactions mainly take place in a high temperature, low oxygen environment, with the reactants at a temperature above their natural temperature and the maximum temperature rise during combustion below their natural temperature, with the oxygen volume fraction being diluted by the combustion products to an extremely low concentration, typically 3% to 5%. In this combustion state, compared to conventional combustion, pyrolysis of fuel is suppressed, the flame thickness becomes thick, and the flame front disappears. So that the temperature of the whole hearth is very uniform during the combustion, and the emission of pollutants of NOx and CO is greatly reduced. The high-temperature air combustion is volume combustion or dispersion combustion and is characterized by low reaction rate, less local heat release, uniform heat flow distribution, low combustion peak temperature and extremely low noise. Compared with the traditional local high-temperature combustion in a small area, the combustion is carried out in a large area or even the whole hearth, and the flame frontal surface disappears; the generation of pollutants such as NOx and CO is obviously reduced; the overall temperature of the hearth is increased, and the radiation heat transfer is enhanced. High-temperature air preheating and high-speed jet flow matching are main modes for realizing high-temperature air combustion; the technical key for maintaining the combustion of high-temperature air is to entrain high-temperature flue gas and dilute combustion air jet; the important conditions for establishing high-temperature air combustion are that the oxygen concentration at any position in the furnace after the jet flow mixing zone is lower than 5% -10%, and the temperature is higher than the self-ignition point of the fuel. This is achieved by means of intense internal recycle dilution of the reactants by the high temperature flue gases (flue gases rich in N2 and CO 2) in the furnace.

It can be understood that the gas water heating equipment using high-temperature air combustion is provided with a shell, the shell is sequentially provided with a preheating combustion chamber and a high-temperature air combustion chamber, the shell is also provided with a smoke outlet, and the preheating burner is arranged in the preheating combustion chamber; the high-temperature air burner is arranged in the high-temperature air combustion chamber, and the gas water heating equipment is also provided with a heat exchanger which is positioned between the smoke outlet and the high-temperature air combustion chamber; the shell is internally provided with a water inlet pipe for introducing water into the gas water heating equipment, a hot water outlet pipe for providing hot water to the outside, a smoke exhaust pipe connected with a smoke exhaust port, a gas inlet pipeline for introducing gas and an air inlet valve, which are all available, and detailed description is omitted. Wherein the preheating burner is used for heating the gas of the high-temperature air combustion chamber. The preheating burner may have a honeycomb structure effective for preventing backfire during combustion, and for example, the gas water heater may further include an igniter for igniting the gas injected from the preheating burner. Be provided with the gas injection pipe in the high temperature air burner, have gas import and gas export, the gas export of gas injection pipe is located in the high temperature air burner to be used for to the high temperature burner sprays the gas, makes carry out high temperature air combustion reaction in the high temperature air burner.

When the gas water heating equipment is started, the preheating burner can be controlled to burn, the gas and the air entering the preheating burner chamber are ignited and ignited by the preheating burner, so that the mixed gas mixed with the gas and the air is burnt to heat the air in the preheating burner chamber, and high-temperature flue gas is formed. It is understood that the air in the preheating combustion chamber can be heated to the target temperature, i.e., the above-mentioned target temperature, by controlling the heating temperature, so that the high-temperature preheating of the air is realized. After the high-temperature gas subjected to high-temperature preheating is sent into the high-temperature air combustion chamber, fuel gas is sprayed into the high-temperature air combustion chamber, the fuel gas is combined with the high-temperature gas, and the high-temperature gas ignites the fuel gas, so that MILD combustion is formed in the high-temperature air combustion chamber. It will be appreciated that heat exchange with the heat exchanger can also be achieved when the preheat burner is operating and heating air in the preheat combustion chamber.

It can also be understood that the gas water heating device can have a preheating function, water in a circulating pipeline can be preheated, the purpose that hot water is obtained by opening a valve when water is used is expected, namely, the zero-cold-water gas water heating device can realize that hot water is used immediately after being opened, and when the preheating function can be started, a built-in circulating pump arranged in the zero-cold-water gas water heating device runs, water stored in an external hot water outlet pipe and a water stored in a water return pipe of the zero-cold-water gas water heating device is pumped back to the zero-cold-water gas water heating device for preheating, so that a preheating circulating pipeline is formed, and preheating is realized. The zero-cold-water function can be applied to bathing scenes and washing zero-cold-water scenes, and certainly, the preheating function can be started by one key according to the requirements of a user, or the preheating time, the preheating temperature and the like can be set by the user. The preheating temperature and the required heat load are different according to different requirements of users. Furthermore, as the heating time increases during the heating process, the required heat load also changes. Alternatively, the water pressure, water flow rate, etc. may be changed depending on the time for which the user uses water. Or, the water inlet temperature can be different along with the difference of the use seasons of the water heater. If the control of the gas water heater is not changed according to the application scenario, for example, if the temperature required to be preheated by the user is low, and the low-load state also adopts high-temperature air combustion, the preheating time is long, the energy consumption is high, and the gas water heater cannot effectively respond to the requirements of the user. If the temperature required by the user for preheating is higher, and only ordinary combustion is adopted in a heavy load state, more pollutants such as NOx, CO and the like are generated.

Referring to fig. 1 to 11, in an embodiment of the present invention, the control method of the gas-fired water heating apparatus includes the steps of:

s100, acquiring the current water inlet temperature of the gas water heating equipment, the current water outlet temperature of the gas water heating equipment and the current water flow of the gas water heating equipment, and determining the current hot water yield of the gas water heating equipment;

in this embodiment, the current water flow may be obtained by calculating through the following process:

calculating the temperature difference between the current water inlet temperature of the gas water heating equipment and the current water outlet temperature of the gas water heating equipment; and calculating the product of the temperature difference and the current water flow of the gas water heating equipment to obtain the current hot water yield of the gas water heating equipment. According to the current outlet water temperature of the gas water heating equipment and the temperature difference between the current inlet water temperature of the gas water heating equipment and the current water flow of the water heater, the instantaneous hot water yield of the gas water heating equipment can be calculated according to the temperature difference and the flow, namely, the current hot water yield, specifically, the current inlet water temperature of the gas water heating equipment 100 is T1, the current outlet water temperature of the gas water heating equipment is T2, the current water flow of the gas water heating equipment 100 is Qw, and the temperature difference between the current inlet water temperature T1 of the gas water heating equipment and the current outlet water temperature T2 of the gas water heating equipment 100 is as follows: Δ T = T2-T1. The current hot water yield of the gas fired water heater 100 is: c1= (T2-T1) × Qw. In this way, the current heat value of the fuel gas is determined according to the hot water quantity which can be heated by the heat generated by the combustion of the fuel gas, namely the hot water yield, so that the current hot water yield can be matched with the target hot water yield.

S200, calculating a difference value between the current hot water yield of the gas water heating equipment and the preset hot water yield of the gas water heating equipment under the current working condition;

it is understood that the hot water yield of the gas water heater may reflect the efficiency of converting the heat of gas combustion into hot water, which is mapped to the air-fuel ratio between gas and air. Namely, the air-fuel ratio is good, and the conversion rate of hot water is higher; conversely, the lower the conversion of hot water. Too large or too small a combustion air-fuel ratio in the combustion chamber of the gas-fired water heating apparatus adversely affects combustion. When the air-fuel ratio is too large, the heat can be taken away by the redundant air, the flame temperature and the heat efficiency are reduced, and the hot water yield is reduced because the heat is taken away; when the air-fuel ratio is too small, combustion is insufficient, the flame temperature and the thermal efficiency are also lowered, and the hot water yield is lowered due to insufficient reaction. The gas water heating equipment of the same model is provided with different reference hot water yields for the same working condition, and the reference hot water yield Co of the gas water heating equipment can understand the hot water yield of the gas water heating equipment detected under the condition of combustion at the optimal air-fuel ratio.

In actual use, gas hot water equipment often has deviation of gas heat values, gas pressure fluctuation and the like in different areas, for example, gas components for town gas are complex, heat values are unstable, differences in different areas are large, a use environment changes suddenly, air pressure and gas pressure are unstable in plateau areas or high floors or due to reasons such as air pressure and gas use peak periods, the gas quantity or the air quantity entering a combustion chamber is influenced in the combustion process, and further the air-fuel ratio in the combustion chamber can be changed. However, at present, when the gas water heating equipment leaves a factory, the constant temperature program setting is often performed only according to the standard gas source, and the requirements of different gas sources across the country are difficult to adapt, so that the preset air-fuel ratio cannot be applied to the current working condition of the gas water heating equipment, and the gas water heating equipment cannot burn under the condition of the optimal air-fuel ratio. Under each working condition, for example, when a user sets a certain temperature value, that is, a preset temperature value, the gas water heating device calculates a heat value according to the preset temperature value, the inlet water temperature, the outlet water temperature, the water flow rate and the like, and then provides corresponding air and gas according to the heat value required by the gas. Therefore, under each operating mode, all have a predetermined air-fuel ratio, change and influence the burning when external environment, lead to actual air-fuel ratio and predetermine when air-fuel ratio mismatch, energy resource consumption height probably appears for gas hot water equipment can not effectual response user's demand, perhaps leads to the burning insufficient, environmental pollution, dangerous condition such as detonation can appear even.

And step S300, when the calculated difference is larger than a preset difference, controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode, and adjusting the flow of mixed gas entering a combustion chamber of the gas water heating equipment in the air-fuel ratio adjusting mode so that the calculated difference is not larger than the preset difference.

In this embodiment, whether the air-fuel ratio in the combustion chamber at this time is reasonable can be determined by the difference between the obtained current hot water yield of the gas hot water apparatus and the reference hot water yield of the gas hot water apparatus under the current working condition, and when the obtained difference is greater than or equal to the preset difference, it indicates that the combustion air-fuel ratio in the combustion chamber at present is not matched with the set gas air-fuel ratio under the standard program. On the contrary, when the obtained difference is smaller than the preset difference, the combustion air-fuel ratio in the current combustion chamber is matched with the combustion air-fuel ratio set under the standard program, and the fuel gas and the air can be continuously conveyed to the combustion chamber according to the current fuel gas and air ratio. That is, when the calculated difference is less than or equal to a preset difference, the gas-fired water heating apparatus is controlled to maintain the current operating mode.

And adjusting the flow of the mixed gas, namely adjusting the flow of the gas and/or the air according to the relation between the target hot water yield and the air-fuel ratio, so that the combustion air-fuel ratio in the current combustion chamber can be in the optimal air-fuel ratio, and when the air-fuel ratio is optimal, the flame temperature reaches a peak value, and the real-time hot water yield of the gas hot water equipment is increased to the reference hot water yield. According to the principle, the flow of the mixed gas in the combustion chamber is adjusted, so that the mixed gas of the fuel gas and the air in the combustion chamber is adaptive to the air-fuel ratio under the current environment, the increase of the hot water quantity which can be heated by the heat generated by the combustion of the fuel gas water heating equipment is improved, the combustion state of the combustion chamber is analyzed through real-time detection, the flow of the mixed gas in the combustion chamber is controlled, the air-fuel ratio of the fuel gas and the air is further enabled to be better, closed-loop control can be achieved, and the current hot water yield of the fuel gas water heating equipment is enabled to be close to the reference hot water yield.

The method comprises the steps of obtaining the current water inlet temperature of the gas water heating equipment, the current water outlet temperature of the gas water heating equipment and the current water flow of the gas water heating equipment, determining the current hot water yield of the gas water heating equipment, calculating the difference value between the current hot water yield of the gas water heating equipment and the reference hot water yield of the gas water heating equipment, controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode when the calculated difference value is larger than a preset difference value, and adjusting the flow of mixed gas entering a combustion chamber of the gas water heating equipment under the air-fuel ratio adjusting mode so that the calculated difference value is not larger than the preset difference value. According to the invention, the current hot water yield of the gas water heating equipment is obtained through real-time detection, and the state of the gas water heating equipment is analyzed according to the current hot water yield and the target benchmark hot water yield, so that the corresponding actions of the fan and the gas proportional valve are controlled, closed-loop control is realized, and the gas water heating equipment can be ensured to run in a better efficiency state during combustion. The invention solves the problems that the gas water heating equipment can not effectively respond the requirements of users due to high energy consumption, or causes insufficient combustion, environmental pollution, even explosion and other dangers.

Referring to fig. 2 and 3, in an embodiment, the step of controlling the gas-fired water heating apparatus to enter the air-fuel ratio adjusting mode when the calculated difference is greater than a preset difference specifically includes:

and S310, adjusting the opening of a gas valve of the gas water heating equipment to adjust the gas flow output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

And/or step S320, adjusting the rotating speed of a fan of the gas water heating equipment to adjust the air flow output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

In this embodiment, the flow rate of the mixed gas is directly proportional to the opening of the gas valve and the rotation speed of the fan, that is, a mapping relationship. The setting of the gas valve opening degree adjusting value can be determined according to the obtained difference value between the current hot water yield and the reference hot water yield, and the larger the difference value between the current hot water yield and the reference hot water yield is, the larger the difference between the air-fuel ratio and the preferred air-fuel ratio is, the larger the gas valve opening degree adjusting value is set at the moment, and the gas valve opening degree adjusting value can be flexibly set according to specific conditions. Similarly, the setting of the fan rotation speed adjustment value may also be determined according to the difference between the obtained current hot water yield and the reference hot water yield, and the larger the difference between the current hot water yield and the reference hot water yield is, the larger the fan rotation speed adjustment value is set. It can be understood that, when detecting that the difference is greater than the difference of predetermineeing between current hot water productivity and the benchmark hot water productivity, can also be through gas pressure sensor, real-time detection wind pressure and gas pressure such as wind pressure sensor, and adjust fan rotational speed and gas valve aperture according to wind pressure and the gas pressure that detect, with the rotational speed of increase or reduction fan, with the proportion of adjusting the air in the mixed gas of output to the combustion chamber, or, reduce or increase gas valve aperture, with the proportion of adjusting the gas in the mixed gas of output to the combustion chamber, according to actual difference, the proportion between accurate control gas flow and the air mass flow, with improve flame temperature, guarantee that gas hot water equipment has best air-fuel ratio, be favorable to gas hot water equipment steady operation more.

Referring to fig. 4, in an embodiment, the gas water heater further includes a blower and a pre-mixing chamber communicated with a combustion chamber of the gas water heater, the pre-mixing chamber includes a gas inlet, an air inlet and a mixed gas outlet, the mixed gas outlet is communicated with the gas inlet and the air inlet to form a mixed gas channel, and the blower is disposed in the mixed gas channel;

when the calculated difference is greater than the preset difference, the step of controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode specifically comprises the following steps:

and S330, adjusting the rotating speed of the fan to adjust the flow of the mixed gas output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

In this embodiment, it can be understood that, in a gas water heater, especially a high temperature air combustion gas water heater, a pre-mixer may be further provided to supply mixed mixer gas to the preheating combustor and/or the high temperature air combustor when gas and air are supplied to the preheating combustor and the high temperature air combustor. According to whether the mixing gas proportion required by the preheating combustion chamber and the high-temperature air combustion chamber is the same or not, the premixer can be set as follows:

when the proportion requirement of the mixed gas needed by the preheating combustion chamber and the high-temperature air combustion chamber is different, the number of the pre-mixers of the gas water heating equipment can be two, wherein one pre-mixer is used for pre-mixing the accessed air and the accessed gas from the gas pipe and providing the mixed gas for the preheating combustion chamber. Because the pre-mixer provides the mixed gas containing the fuel gas and the air, and the mixed gas is output to the preheating combustion chamber, the preheating combustor can ignite and burn the mixed gas, and the high-temperature preheating air is realized. Another premixer then provides the mist to the high temperature air combustion chamber, because the mist including gas and air is provided through the premixer, the mist exports to the high temperature air combustion chamber, and pressurize the mist of carrying to the high temperature air combustion chamber through the combustor, it produces entrainment effect to form the injection gas that has certain jet velocity and cooperate, make the high temperature flue gas backward flow, realize on the one hand and keep warm and make the temperature be higher than the spontaneous combustion point of fuel, make the gas can the spontaneous combustion in the combustion chamber, on the other hand through jet entrainment dilution air, make oxygen concentration be less than a definite value, realize even combustion, so, make the high temperature air burning take place in the combustion chamber, can reach MILD burning requirement, reduce CO and NOx emission.

When the proportion requirements of the mixed gas needed by the two preheating combustion chambers and the high-temperature air combustion chamber are the same, the total air and the fuel gas can be mixed, namely, a full premixer is arranged, when full premixing is carried out, in order to facilitate the mixing of the gas, a mixed gas distribution chamber can be arranged or formed in the preheating combustion chamber, the gas inlet of the mixed gas distribution chamber is communicated with the full premixer, and the gas outlet of the mixed gas distribution chamber is communicated with the preheating combustion chamber and the high-temperature air combustion chamber so as to distribute the mixed gas of the gas conveyed to the preheating combustion chamber and the high-temperature air combustion chamber to be ignited. The full premixer mixes the accessed air and gas and then respectively outputs the mixed gas to the preheating combustion chamber and the high-temperature air combustion chamber.

The embodiment takes a full premixer as an example for description, when the difference between the current hot water yield and the reference hot water yield is greater than or equal to the preset difference, the rotating speed of the fan is increased or decreased to adjust the proportion of air in the mixed gas output to the combustion chamber, or the opening degree of the gas valve is decreased or increased to adjust the proportion of gas in the mixed gas output to the combustion chamber, and according to the actual current hot water yield, the proportion between the gas flow and the air flow is accurately controlled to improve the flame temperature, so that the gas water heating equipment is ensured to have the optimal air-fuel ratio, and the stable operation of the gas water heating equipment is facilitated.

Referring to fig. 5, in an embodiment, the gas-fired water heating apparatus includes a preheating burner and a high temperature air burner which is connected to high temperature flue gas formed by combustion of the preheating burner to generate high temperature air combustion; the gas water heating equipment also comprises a gas feeding assembly which is used for feeding gas to a combustion chamber where the preheating burner is located and a combustion chamber where the high-temperature air burner is located;

when the calculated difference is greater than the preset difference, the step of controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode specifically comprises the following steps:

and step S340, controlling the air feeding assembly to adjust the gas and/or air flow output to the combustion chamber where the high-temperature air combustor is located.

In this embodiment, the combustion chamber has two combustion chambers, namely a first combustion chamber and a second combustion chamber, and the air supply assembly has at least one air inlet and two air outlets, wherein one air outlet is used for delivering air to the first combustion chamber, and the other air outlet is used for delivering air to the second combustion chamber. It will be appreciated that by controlling the speed of the fan, the total amount of air drawn into the first and second combustion chambers can be controlled, and that at least one air adjustment valve for adjusting the flow of air is provided between the two outlets and the two combustion chambers, by adjusting which air adjustment valve the amount of air output to the first and second combustion chambers can be adjusted. The air delivery assembly also has at least one air inlet and two air outlets, one of which is for delivering air to the first combustion chamber and the other of which is for delivering air to the second combustion chamber. It is understood that the total amount of gas sucked into the first and second combustion chambers can be controlled by controlling the opening degree of the gas valve, and at least one gas regulating valve for regulating the flow rate of air is provided between the two air outlets and the two combustion chambers, and the amount of gas outputted to the first and second combustion chambers can be regulated by regulating the gas regulating valve. So, can realize according to actual current value, the proportion between accurate control gas flow and the air mass flow to improve flame temperature, guarantee that gas hot water equipment has the best air-fuel ratio, be favorable to gas hot water equipment more steady operation.

The invention also provides a gas water heating equipment control device, which comprises a processor, a memory and a gas water heating equipment control program which is stored on the memory and can run on the processor; wherein the gas water heater control program, when executed by the processor, implements the steps of the method of controlling a gas water heater as described above.

Referring to fig. 11, fig. 11 is a schematic terminal structure diagram of a hardware operating environment of a gas water heater control device according to an embodiment of the present invention.

The terminal of the embodiment of the invention can be a PC, and can also be a mobile terminal device with a display function, such as a smart phone, a tablet computer, an electronic book reader, an MP4 (Moving Picture Experts Group Audio Layer IV) player, a portable computer and the like. As shown in fig. 11, the terminal may include a processor 1001 (e.g., CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for implementing connection communication among the components; the user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface); the memory 1005 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as a disk memory, and the memory 1005 may optionally be a storage device separate from the processor 1001.

Those skilled in the art will appreciate that the terminal configuration of the hardware operating environment of the apparatus shown in fig. 11 does not constitute a limitation of the gas-fired water heating apparatus control apparatus of the present invention and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The invention also provides gas water heating equipment.

Referring to fig. 8 to 10, provided with a cold water inlet pipe and a hot water outlet pipe, the gas water heating apparatus includes:

a burner 100 having a combustion chamber formed therein; and (c) a second step of,

the gas water heating equipment control device is used for controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode when the difference value between the current hot water yield of the gas water heating equipment and the reference hot water yield of the gas water heating equipment is larger than a preset difference value.

In this embodiment, the detailed structure of the control device of the gas water heating apparatus can refer to the above embodiments, and is not described herein again; it can be understood that, because the gas water heating apparatus control device is used in the gas water heating apparatus of the present invention, the embodiment of the gas water heating apparatus of the present invention includes all technical solutions of all embodiments of the gas water heating apparatus control device, and the achieved technical effects are also completely the same, and are not described herein again. In addition, the gas water heating device may be a gas wall-hanging stove, a gas water heater, or the like.

In this embodiment, the hot water production rate also reaches a peak value when the air-fuel ratio is optimal, according to the relationship between the hot water production rate and the air-fuel ratio by the gas-fired hot water apparatus control device. According to the principle, the flow of the mixed gas in the combustion chamber is adjusted, so that the mixed gas of the gas and the air in the combustion chamber is adaptive to the air-fuel ratio under the current environment, the operation efficiency of the gas water heating equipment is improved, the hot water yield is analyzed through real-time detection, the flow of the mixed gas in the combustion chamber is controlled, the air-fuel ratio of the gas and the air is better, closed-loop control can be realized, and the combustion of the gas water heating equipment is ensured to operate in a high-efficiency state. In an embodiment, the gas water heating apparatus further includes a gas supply assembly 500, a fan 510 may be disposed in the gas supply assembly 500, and gas introduced into the gas guide tube 520 and air introduced into the air guide tube 530 are mixed by turbulent flow of the fan.

The gas enters the fan 510 through the gas proportional valve 540 and the gas guide pipe 520, and is fully mixed with the air sucked by the fan 510 through the air guide pipe 530 under the disturbance of the fan impeller to form air-gas mixed gas with a certain proportion; this gas mixture is under the fan effect, and partly distribute to one-level preheating burner 120 and preheat the burning, produces high temperature hypoxemia flue gas, and another part is distributed to second grade high temperature air burner 110, and this part gas mixture is under the high temperature hypoxemia flue gas effect that one-level burner 120 produced, is heated and dilutes, forms the high temperature air burning. Finally, the flue gas is discharged through the heat exchanger 200, the smoke collecting hood 400 and the smoke exhaust pipe 300, and the function of the flue gas is that when the high-temperature flue gas passes through the heat exchanger 200, part of the high-temperature flue gas is condensed by the condensed water collector 600 to generate acid condensed water, and the acid condensed water is neutralized by acid and alkali and then discharged.

Referring to fig. 8 to 10, in an embodiment, the burner 100 includes:

a high temperature air burner 110 installed in the combustion chamber;

a preheating burner 120 installed in the combustion chamber and disposed adjacent to the high temperature air burner 110; and (c) a second step of,

and one end of the heat exchanger 200 is communicated with the cold water inlet pipe 10, the other end of the heat exchanger 200 is communicated with the hot water outlet pipe 20, and at least part of the heat exchange pipe of the heat exchanger 200 is arranged in the combustion chamber and used for absorbing heat generated by combustion of the burner 100 and exchanging the absorbed heat with water in the heat exchanger 200.

The heat exchanger 200 includes a main heat exchanger and a condensing heat exchanger disposed in the flow direction of the flue gas, at least a part of the main heat exchanger is disposed in the combustion chamber, and the condensing heat exchanger is used for absorbing heat in the high-temperature flue gas to preheat water in the heat exchange pipe.

Wherein the preheating burner 120 includes: a porous media burner comprising a fully premixed metal fiber mesh burner disposed within the combustion chamber;

a high temperature air burner 110 installed downstream of the preheating burner 120; the ignition device 150 is arranged in the combustion chamber and corresponds to the porous medium burner so as to ignite the porous medium burner;

a flame induction device 140, wherein the flame induction device 140 is used for detecting whether the preheating burner 120 is in a burning state, and controlling the ignition device 150 to ignite again when detecting that the preheating burner 120 is not in the burning state.

The burner 100 further comprises a mixing cavity and a baffle 160 arranged between the air inlet cavity 130 and the first combustion chamber, wherein a plurality of air holes are arranged on the baffle 160 to form a first flow path 1 for the gas in the air inlet cavity 130 to flow into the first combustion chamber 20;

the side edge of the baffle 160 and the wall of the air inlet chamber 130 form a second flow path 2 for the gas in the air inlet chamber 130 to flow into the second combustion chamber.

An air hole is arranged in the middle of the baffle 160 or at a position corresponding to the first combustion chamber, and the gas output by the air inlet cavity 130 flows into the first combustion chamber through the air hole, so as to provide air and fuel gas required by preheating combustion for the first combustion chamber. And a gas flow path flowing into at least the second combustion chamber is defined between the side edge of the baffle 160 and the wall of the air inlet cavity 130, and under the turbulent flow action of the baffle 160, the gas flows into the second combustion chamber through a second flow path formed between the side edge of the baffle 160 and the wall of the air inlet cavity 130, so that air and fuel gas required by high-temperature air combustion are provided for the second combustion.

The combustor 100 further includes a multi-hole spoiler 170, a plurality of spoiler through holes are provided on the multi-hole spoiler 170, and the aperture of the spoiler through holes is smaller than the aperture of the air hole of the baffle 160. The gas flowing into the first combustion chamber is more uniform by the multi-hole spoiler 170, thereby ensuring that the gas can be uniformly mixed with the mixed gas and air in each region of the first combustion chamber.

In this embodiment, a porous medium full premix combustion mode is adopted, after the ignition device 150 is ignited, preheat combustion is realized, a porous medium burner is arranged in the first combustion chamber, a specific preheat burner may be, for example, a wire mesh burner, to perform full premix combustion, and perform high temperature air combustion in the second combustion chamber, at least part of heat exchange tubes of the main heat exchanger of the heat exchanger 200 are arranged in the first combustion chamber and/or the second combustion chamber, so as to directly perform heat exchange in the radiation and heat conduction mode with the high temperature porous medium in the combustion chamber, during the flow of high temperature flue gas, secondary heat exchange is continuously performed with a condensing heat exchanger arranged in the flow direction of the flue gas, the heat exchange tubes of the condensing heat exchanger are communicated with a water inlet tube of a water heater, so that the flue gas can be quenched to condense water vapor, and further latent heat of the water vapor in the flue gas can be collected by the smoke collecting hood 400 and the condenser 200 communicated with the smoke collecting hood 400, thereby improving the heat efficiency.

Referring to fig. 7, further, in the above embodiment, the gas water heating apparatus control device further includes an inlet water temperature sensor T11 disposed at the inlet pipe side, an outlet water temperature sensor T12 disposed at the outlet pipe side, and a water flow sensor A2 disposed in the inlet pipe, the inlet water temperature is detected by the inlet water temperature sensor T11, the inlet water flow is detected by the water flow sensor A2, the mass M of water is obtained from the detected inlet water temperature and inlet water flow, and the inlet water temperature T1, the obtained mass M of water, and the target temperature T2 are used to calculate the heat load Q required by the gas water heating apparatus to heat the inlet water from the inlet water temperature to the target temperature. The invention solves the problems that the preheating time is long and the energy consumption is high due to the adoption of high-temperature air combustion when the gas water heating equipment is under low load, so that the gas water heating equipment cannot effectively respond to the requirements of users. Or the temperature required by a user to be preheated is higher, and the generation of pollutants such as NOx, CO and the like is more due to the adoption of only ordinary combustion in a large load state.

The present invention also proposes a computer readable storage medium having stored thereon a gas water heating apparatus control program which, when executed by a processor, implements the steps of the control method of a gas water heating apparatus as described above.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (13)

1. A control method of a gas water heating device is characterized by comprising the following steps:

acquiring the water inlet temperature, the water outlet temperature and the water flow of the gas water heating equipment, and determining the current hot water yield of the gas water heating equipment;

calculating a difference value between the current hot water yield of the gas hot water equipment and a preset reference hot water yield; and the number of the first and second groups,

and when the calculated difference is larger than a preset difference, controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode, and adjusting the flow of mixed gas entering a combustion chamber of the gas water heating equipment in the air-fuel ratio adjusting mode so that the calculated difference is not larger than the preset difference.

2. The method for controlling a gas-fired water heating apparatus according to claim 1, wherein the step of controlling the gas-fired water heating apparatus to enter an air-fuel ratio adjusting mode when the calculated difference is greater than a preset difference specifically comprises:

and adjusting the opening degree of a gas valve of the gas water heating equipment to adjust the gas flow output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

3. The method for controlling the gas-fired water heating apparatus according to claim 1, wherein the step of controlling the gas-fired water heating apparatus to enter an air-fuel ratio adjusting mode when the calculated difference is greater than a preset difference specifically comprises:

and adjusting the rotating speed of a fan of the gas water heating equipment to adjust the air flow output to the combustion chamber until the adjusted difference is smaller than or equal to a preset difference.

4. The control method of the gas water heating device according to claim 1, wherein the gas water heating device further comprises a fan and a premixing chamber communicated with a combustion chamber of the gas water heating device, the premixing chamber comprises a gas inlet, an air inlet and a mixed gas outlet, the mixed gas outlet is communicated with the gas inlet and the air inlet to form a mixed gas channel, and the fan is arranged in the mixed gas channel;

when the calculated difference is greater than a preset difference, the step of controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode specifically comprises the following steps:

and adjusting the rotating speed of the fan to adjust the flow of the mixed gas output to the combustion chamber until the adjusted difference value is less than or equal to a preset difference value.

5. The control method of the gas-fired water heating apparatus according to claim 1, wherein the gas-fired water heating apparatus comprises a preheating burner and a high temperature air burner which is connected to high temperature flue gas formed by combustion of the preheating burner to generate high temperature air combustion; the gas water heating equipment also comprises a gas feeding assembly which is used for feeding gas to a combustion chamber where the preheating burner is located and a combustion chamber where the high-temperature air burner is located;

when the calculated difference is greater than a preset difference, the step of controlling the gas water heating equipment to enter an air-fuel ratio adjusting mode specifically comprises the following steps:

and controlling the air feeding assembly to adjust the flow of the fuel gas and/or air output to the combustion chamber where the high-temperature air combustor is located.

6. The gas-fired water heating apparatus control method according to claim 1, further comprising after the step of calculating a difference between a current hot water production rate of the gas-fired water heating apparatus and a reference hot water production rate of the gas-fired water heating apparatus:

and when the calculated difference is less than or equal to a preset difference, controlling the gas water heating equipment to maintain the current working mode.

7. The method for controlling a gas-fired water heating apparatus according to claim 1, wherein the step of obtaining the current water inlet temperature of the gas-fired water heating apparatus, the current water outlet temperature of the gas-fired water heating apparatus, and the current water flow rate of the gas-fired water heating apparatus, and determining the current hot water yield of the gas-fired water heating apparatus specifically comprises:

calculating the temperature difference between the current water inlet temperature of the gas water heating equipment and the current water outlet temperature of the gas water heating equipment;

and calculating the product of the temperature difference and the current water flow of the gas water heating equipment to obtain the current hot water yield of the gas water heating equipment.

8. A gas-fired water heating equipment control device is characterized by comprising a processor, a memory and a gas-fired water heating equipment control program which is stored on the memory and can run on the processor; wherein the gas-fired water heating apparatus control program when executed by the processor implements the steps of the control method of the gas-fired water heating apparatus according to any one of claims 1 to 7.

9. The utility model provides a gas hot water equipment, is provided with cold water inlet tube and hot water outlet pipe, its characterized in that, gas hot water equipment includes:

a burner having a combustion chamber formed therein;

and the gas-fired water heating equipment control device according to claim 8, the gas-fired water heating equipment control device is used for controlling the gas-fired water heating equipment to enter an air-fuel ratio regulation mode when the difference value between the current hot water yield of the gas-fired water heating equipment and the reference hot water yield of the gas-fired water heating equipment is greater than a preset difference value.

10. The gas-fired water heating apparatus of claim 9, further comprising:

a high temperature air burner installed in the combustion chamber;

a preheating burner installed in the combustion chamber and disposed adjacent to the high temperature air burner.

11. The gas fired water heating apparatus according to claim 10, further comprising a gas feed assembly in communication with said combustion chamber, said gas feed assembly in operation feeding gas to the combustion chamber in which said preheating burner is located and to the combustion chamber in which said high temperature air burner is located, respectively.

12. The gas-fired water heating apparatus of claim 9, further comprising:

and one end of the heat exchanger is communicated with the cold water inlet pipe, the other end of the heat exchanger is communicated with the hot water outlet pipe, and the heat exchanger is used for absorbing heat generated by combustion of the burner and exchanging the absorbed heat with water in the heat exchanger.

13. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a gas-fired water heating apparatus control program which, when executed by a processor, implements the steps of the control method of the gas-fired water heating apparatus according to any one of claims 1 to 8.

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