CN110566962A - Combustion control method of heat accumulating type single-burner aluminum melting furnace with adjustable air-fuel ratio - Google Patents
Combustion control method of heat accumulating type single-burner aluminum melting furnace with adjustable air-fuel ratio Download PDFInfo
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- CN110566962A CN110566962A CN201910916419.4A CN201910916419A CN110566962A CN 110566962 A CN110566962 A CN 110566962A CN 201910916419 A CN201910916419 A CN 201910916419A CN 110566962 A CN110566962 A CN 110566962A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/20—Arrangement of controlling, monitoring, alarm or like devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
- F27B2014/146—Recuperation of lost heat, e.g. regenerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/01—Charges containing mainly non-ferrous metals
- F27M2001/012—Aluminium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/13—Smelting
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention provides a combustion control method of a heat accumulating type single-burner aluminum melting furnace with an adjustable air-fuel ratio, which is characterized in that the method controls the gas flow of gas in a gas flow regulating valve into the heat accumulating type single-burner aluminum melting furnace according to the real-time detected hearth temperature and the gas flow; obtaining a real-time air-fuel ratio according to the real-time detected hearth temperature, the real-time detected exhaust gas temperature, the real-time detected combustion air temperature and the real-time detected fuel gas temperature, or setting the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace; and controlling the air flow of the combustion air in the combustion air flow regulating valve into the heat accumulating type single-burner aluminum melting furnace according to the air-fuel ratio and the combustion air flow detected in real time, so as to realize the real-time control and regulation of the gas flow and the air flow and improve the combustion heat efficiency of the heat accumulating type single-burner aluminum melting furnace. The control method can realize automatic adjustment of the air-fuel ratio, so that the system can better adapt to the change of the combustion characteristics of the aluminum melting furnace in different combustion stages, and the aims of saving energy, reducing consumption and improving the quality of molten aluminum are fulfilled.
Description
Technical Field
The invention relates to the technical field of combustion control, in particular to a combustion control method of a heat accumulating type single-burner aluminum melting furnace with an adjustable air-fuel ratio.
Background
The aluminum alloy smelting and casting are main energy consumption processes in the aluminum processing industry, and the energy consumption of the aluminum alloy smelting and casting accounts for about 60 percent of that of the aluminum production process; how to realize energy conservation and emission reduction by improving the existing production process and equipment has important significance for realizing green low-carbon economy in the aluminum processing industry.
Common energy-saving measures of the existing aluminum melting furnace are as follows:
1) Technological improvement, such as shortening and optimizing the fusion casting technological process.
2) And the heat accumulating type burners and other advanced burners are adopted, so that waste heat resource recovery is realized, and the smoke exhaust temperature is reduced.
3) The high-standard refractory material is selected, so that the heat exchange area is increased, and the heat dissipation loss of the wall body of the aluminum melting furnace is reduced.
4) And a heat exchanger is additionally arranged or a flue gas waste heat cascade utilization system is additionally arranged to realize waste heat recovery.
5) the excess air ratio of the aluminum melting furnace is controlled by adopting a more advanced mode such as automatic adjustment of the fuel-air ratio, so that the heat loss of exhaust smoke caused by excessive air quantity and the heat loss of incomplete combustion of fuel caused by insufficient air quantity are reduced.
In the above energy saving measures, the automatic fuel-air ratio adjusting technology is directly related to the heat efficiency of the aluminum melting furnace, and represents the level of automation of an aluminum processing enterprise.
At present, in the smelting equipment in the industry of aluminum profile extrusion forming products, a traditional combustion control system usually adopts a pressure balance (pressure equalizing) mode, and the defects are as follows:
1) Since only the pressure is controlled, there is a possibility that it does not match the combustor.
2) The adjustable range of the burner air to gas flow ratio is limited.
3) And the control precision is lower and the repeatability is poor during adjustment.
4) When using preheated air, temperature correction cannot be performed (i.e., the air to gas flow ratio cannot be adjusted).
5) Once the combustion characteristics of the aluminum melting furnace are changed, accurate control cannot be realized.
Therefore, the traditional fixed air-fuel ratio control mode cannot ensure higher thermal efficiency in the whole combustion process.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provide a combustion control method of a heat accumulating type single-burner aluminum melting furnace with an adjustable air-fuel ratio.
In order to achieve the purpose, the invention is realized by the following technical scheme: a combustion control method of a heat accumulating type single-burner aluminum melting furnace with an adjustable air-fuel ratio is characterized by comprising the following steps:
Controlling the gas flow of gas in the gas flow regulating valve into the heat accumulating type single-burner aluminum melting furnace according to the real-time detected hearth temperature and the gas flow;
Obtaining a real-time air-fuel ratio according to the real-time detected hearth temperature, the real-time detected exhaust gas temperature, the real-time detected combustion air temperature and the real-time detected fuel gas temperature, or setting the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace; and controlling the air flow of the combustion air in the combustion air flow regulating valve into the heat accumulating type single-burner aluminum melting furnace according to the air-fuel ratio and the combustion air flow detected in real time, so as to realize the real-time control and regulation of the gas flow and the air flow and improve the combustion heat efficiency of the heat accumulating type single-burner aluminum melting furnace.
The furnace temperature control of the aluminum melting furnace mainly comprises the control of gas flow and air flow. The air-fuel ratio is an important parameter of the heating equipment, and has great influence on exhaust emission, thermal efficiency and economic performance. Insufficient air flow can cause insufficient combustion of fuel gas, and waste of energy is caused; and if the air flow is too large, the air can be fully combusted, but a large amount of heat can be taken away by redundant air, and energy waste can also be caused. In order to obtain the maximum combustion efficiency of the aluminum melting furnace, the air-fuel ratio needs to be controlled within a reasonable range.
In the conventional proportional control method, an operator sets a fixed air-fuel ratio according to the common sense and experience of operation; in the combustion stage of the aluminum melting furnace, the control system can automatically control the opening of the air regulating valve and the gas regulating valve according to the temperature of the hearth or the flue gas. The disadvantage of this control method is that the opening ratio of the air regulating valve and the gas regulating valve is kept fixed during the combustion process, and the flexibility is poor. In fact, the aluminum melting furnace has the characteristics of multi-coupling and strong nonlinearity, and uncertain factors such as gas pressure and heat value which influence the combustion characteristics of the aluminum melting furnace are numerous, so that the control mode of the fixed air-fuel ratio cannot ensure higher thermal efficiency in the whole combustion process.
In the scheme, the air-fuel ratio adjustable combustion control mode is adopted, the air-fuel ratio is changed in real time according to the change conditions of the preheating temperature, namely the temperature of combustion-supporting air, the temperature of fuel gas, the temperature of a hearth and the temperature of exhaust smoke, and the air-fuel ratio is used as one of the input quantities of the air flow control unit to control and adjust the output quantity of the combustion-supporting air in the combustion-supporting air flow regulating valve entering the heat accumulating type single-burner aluminum melting furnace, so that the system can better adapt to the change of the combustion characteristics of the aluminum melting furnace in different combustion stages, the purposes of saving energy, reducing consumption and improving the quality of molten aluminum are achieved, and the.
Specifically, setting an initial hearth temperature and an initial gas flow; the initial hearth temperature and the real-time detected hearth temperature are used as input quantities of a furnace temperature control unit to obtain a hearth temperature control quantity; the hearth temperature control quantity, the initial gas flow and the gas flow detected in real time are used as input quantities of a gas flow control unit, and the gas flow of gas in a gas flow control valve entering the heat accumulating type single-burner aluminum melting furnace is controlled through a gas flow control unit.
Specifically, an initial air flow rate is set; the real-time detected hearth temperature, the smoke exhaust temperature, the combustion air temperature and the fuel gas temperature are used as input quantities of an air-fuel ratio control unit to obtain a real-time air-fuel ratio; the air-fuel ratio, the initial air flow and the air flow detected in real time are used as input quantities of an air flow control unit, and the air flow control unit is used for controlling the air flow of combustion air in a combustion air flow regulating valve into the heat accumulating type single-burner aluminum melting furnace.
the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace is as follows: in a working interval which is usually set by a heat accumulating type single-burner aluminum melting furnace, the optimal air-fuel ratio is determined by taking the fastest temperature rise as a target or according to the flame characteristics of a hearth, and the optimal air-fuel ratio is taken as the set air-fuel ratio.
Or, the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace means: selecting an optimal air-fuel ratio as an initial air-fuel ratio, and setting an upper temperature limit set value; and performing combustion control by using the optimal air-fuel ratio, and gradually changing the air-fuel ratio when the temperature reaches the upper temperature limit set value to finally determine the set air-fuel ratio.
Or, the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace means: and in an experience database of the work of the heat accumulating type single-burner aluminum melting furnace, searching numerical values corresponding to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace to calculate the air-fuel ratio, wherein the air-fuel ratio is used as the set air-fuel ratio.
And a furnace temperature measuring thermocouple is arranged on the side wall of the middle part of the heat accumulating type single-burner aluminum melting furnace so as to detect the hearth temperature of the heat accumulating type single-burner aluminum melting furnace in real time.
And a smoke discharge temperature thermocouple is arranged at the smoke discharge position at the top of the heat accumulating type single-burner aluminum melting furnace so as to detect the smoke discharge temperature of the heat accumulating type single-burner aluminum melting furnace in real time.
A combustion-supporting fan and an air supply pipeline are arranged, and the combustion-supporting fan is connected with the heat accumulating type single-burner aluminum melting furnace through the air supply pipeline; the combustion air flow regulating valve is arranged on the air supply pipeline; and a combustion-supporting air temperature thermocouple is also arranged on the air supply pipeline so as to detect the temperature of combustion-supporting air entering the heat accumulating type single-burner aluminum melting furnace in real time.
Arranging a fuel gas supply device and a fuel gas supply pipeline, wherein the fuel gas supply device is connected with the heat accumulating type single-burner aluminum melting furnace through the fuel gas supply pipeline; the gas flow regulating valve is arranged on the gas supply pipeline; and a thermocouple for measuring the gas temperature is also arranged on the gas supply pipeline so as to detect the temperature of the gas entering the heat accumulating type single-burner aluminum melting furnace in real time.
Compared with the prior art, the invention has the following advantages and beneficial effects: the combustion control method of the heat accumulating type single-burner aluminum melting furnace with the adjustable air-fuel ratio can realize automatic adjustment of the air-fuel ratio, so that the system can better adapt to the change of the combustion characteristics of the aluminum melting furnace in different combustion stages, and the purposes of saving energy, reducing consumption and improving the quality of aluminum melting are achieved.
Drawings
FIG. 1 is a schematic control principle diagram of a heat accumulating type single burner combustion control method with adjustable air-fuel ratio of the invention;
FIG. 2 is a schematic view of a control system implementing the control method of the present invention;
FIG. 3 is a schematic diagram of the input and output signal components of the control mechanism in the control system;
Wherein, 1 is a heat accumulating type single burner aluminum melting furnace, 2 is a combustion fan, 3 is a heat exchanger, 4 is an air supply pipeline, 5 is a gas supply pipeline, 6 is a combustion air flow regulating valve, 7 is a combustion air flow meter, 8 is a gas flow regulating valve, 9 is a gas flow meter, 10 is a programmable logic controller PLC, 11 is a thermocouple for measuring furnace temperature, 12 is a combustion air temperature thermocouple, 13 is a thermocouple for measuring gas temperature, 14 is a combustion air pressure gauge, 15 is a pressure measuring sensor before the combustion air flow regulating valve, 16 is a pressure measuring sensor after the combustion air flow regulating valve, 17 is a pressure measuring sensor before the gas flow regulating valve, 18 is a pressure measuring sensor after the gas flow regulating valve, 19 is a gas pressure gauge, 20 is a gas electromagnetic valve, 21 is a gas safety cut-off valve, 22 is a gas diffusion electromagnetic valve, 23 is a gas leakage detecting electromagnetic valve, 24 is a touch screen, and 25 is a gas pressure regulating valve.
Detailed Description
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Examples
as shown in fig. 1 and fig. 2, the combustion control method of the heat accumulating type single burner aluminum melting furnace with adjustable air-fuel ratio of the present invention is realized by the control system of fig. 2, and the control system comprises a heat accumulating type single burner aluminum melting furnace 1 as a combustion object, a combustion fan 2, a gas supply device, a heat exchanger 3, an air supply pipeline 4, a gas supply pipeline 5, a combustion air flow regulating valve 6, a combustion air flow meter 7, a gas flow regulating valve 8, a gas flow meter 9, a programmable logic controller PLC10 and a detection mechanism, wherein the combustion fan 2 is connected with the heat accumulating type single burner aluminum melting furnace 1 through the air supply pipeline 4, and the combustion air flow meter 7, the heat exchanger 3 and the combustion air flow regulating valve 6 are sequentially arranged on the air supply pipeline 4; the gas supply device is connected with the heat accumulating type single-burner aluminum melting furnace 1 through a gas supply pipeline 5, and a gas flow meter 9 and a gas flow regulating valve 8 are sequentially arranged on the gas supply pipeline 5. The programmable controller PLC10 is connected to the combustion fan 2, the gas supply device, the combustion air flow meter 7, and the gas flow meter 9.
The programmable controller PLC10 also comprises a furnace temperature control unit, a gas flow control unit, an air flow control unit and an air-fuel ratio control unit, and the detection mechanism comprises a furnace temperature measuring thermocouple 11 for measuring the furnace temperature of the heat accumulating type single-burner aluminum melting furnace 1, a combustion air temperature thermocouple 12 for measuring the temperature of combustion air and a gas temperature measuring thermocouple 13 for measuring the temperature of gas. The measuring furnace temperature thermocouple 11 is arranged on the side wall of the middle part of the heat accumulating type single-burner aluminum melting furnace 1 and is sequentially in signal connection with the furnace temperature control unit, the gas flow regulating valve 8 and the heat accumulating type single-burner aluminum melting furnace 1; the furnace temperature control unit and the air-fuel ratio control unit are respectively connected with the air flow control unit, the combustion air flow regulating valve 6 and the heat accumulating type single burner aluminum melting furnace 1 in sequence through signals. A combustion air temperature thermocouple 12 is arranged on the air supply pipeline 4 and is in signal connection with the air flow control unit, and a gas temperature measuring thermocouple 13 is arranged on the gas supply pipeline 5 and is in signal connection with the gas flow control unit. And the furnace temperature measuring thermocouple 11, the combustion air temperature thermocouple 12 and the gas temperature measuring thermocouple 13 are respectively connected with an air-fuel ratio control unit, so that the air-fuel ratio of the heat accumulating type single-burner aluminum melting furnace 1 is automatically adjusted.
The control system of the embodiment further comprises a smoke discharge temperature thermocouple for measuring the smoke discharge temperature of the heat accumulating type single-burner aluminum melting furnace 1, wherein the smoke discharge temperature thermocouple is arranged at the smoke discharge position at the top of the heat accumulating type single-burner aluminum melting furnace 1 and is in signal connection with the air-fuel ratio control unit. The control system further comprises a combustion air pressure gauge 14, a combustion air flow regulating valve front pressure measuring sensor 15 and a combustion air flow regulating valve rear pressure measuring sensor 16 which are connected with the programmable controller PLC10, wherein the combustion air pressure gauge 14, the combustion air flow regulating valve front pressure measuring sensor 15 and the combustion air flow regulating valve rear pressure measuring sensor 16 are all arranged on the air supply pipeline 4. And a combustion air flow regulating valve front pressure measuring sensor 15 and a combustion air flow regulating valve rear pressure measuring sensor 16 are respectively connected with the input end and the output end of the combustion air flow regulating valve 6.
the control system further comprises a gas flow regulating valve front pressure measuring sensor 17 and a gas flow regulating valve rear pressure measuring sensor 18 which are connected with the programmable controller PLC10, wherein the gas flow regulating valve front pressure measuring sensor 17 and the gas flow regulating valve rear pressure measuring sensor 18 are both arranged on the gas supply pipeline 5 and are respectively connected with the input end and the output end of the gas flow regulating valve 8. In addition, the invention also comprises a gas pressure gauge 19, a gas electromagnetic valve 20, a gas safety cut-off valve 21, a gas diffusion electromagnetic valve 22, a gas leakage detection electromagnetic valve 23 and a gas pressure regulating valve 25 which are arranged on the gas supply pipeline 5, wherein the gas electromagnetic valve 20, the gas safety cut-off valve 21, the gas diffusion electromagnetic valve 22, the gas leakage detection electromagnetic valve 23 and the gas pressure regulating valve 25 are all connected with the programmable controller PLC 10. The control system also includes a touch screen 24, and a programmable logic controller PLC10 is connected to the touch screen 24.
in the embodiment, a Siemens S7-200 PLC, an expansion I/O module and an analog quantity module are used as core control mechanisms and are matched with a heat accumulating type single-burner aluminum melting furnace 1 to form a hardware platform integrating the collection and control of combustion pressure, flow, temperature, reversing valve position, electromagnetic valve, electric actuator, flame signal and fan data signal. Wherein, S7-200 PLC is the core processor of the control mechanism, and the algorithms of furnace temperature control, pressure correction, air-fuel ratio adjustment and the like are all realized in the control mechanism. The input and output signals are shown in fig. 3. The system can freely set the air-fuel ratio and has the function of automatic temperature/pressure correction. Compared with the traditional constant air-fuel ratio control system, the system can realize more accurate combustion control in the whole combustion range, thereby more stably controlling the atmosphere of the smelting furnace, improving the quality of molten aluminum, reducing the emission of nitrogen oxide and protecting the environment while realizing energy conservation.
The air-fuel ratio adjustable heat accumulating type single burner combustion control method comprises the following steps: controlling the gas flow of the gas in the gas flow regulating valve 8 entering the heat accumulating type single-burner aluminum melting furnace 1 according to the real-time detected hearth temperature and the gas flow;
Obtaining a real-time air-fuel ratio according to the real-time detected hearth temperature, the real-time detected exhaust gas temperature, the real-time detected combustion air temperature and the real-time detected fuel gas temperature, or setting the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace 1; and controlling the air flow of the combustion air entering the heat accumulating type single-burner aluminum melting furnace 1 from the combustion air flow regulating valve 6 according to the air-fuel ratio and the combustion air flow detected in real time, so as to realize the real-time control and regulation of the gas flow and the air flow and improve the combustion heat efficiency of the heat accumulating type single-burner aluminum melting furnace 1.
specifically, an initial hearth temperature and an initial gas flow are set, the initial hearth temperature and the real-time detected hearth temperature are used as input quantities of a furnace temperature control unit to obtain a hearth temperature control quantity, the initial gas flow and the real-time detected gas flow are used as input quantities of a gas flow control unit, and the gas flow control unit is used for controlling the gas flow of gas in a gas flow control valve 8 into the heat accumulating type single-burner aluminum melting furnace 1.
setting an initial air flow rate; the real-time detected hearth temperature, the smoke exhaust temperature, the combustion air temperature and the fuel gas temperature are used as input quantities of an air-fuel ratio control unit to obtain a real-time air-fuel ratio; the air-fuel ratio, the initial air flow and the air flow detected in real time are used as input quantities of an air flow control unit, and the air flow control unit is used for controlling the air flow of combustion air in a combustion air flow regulating valve 6 into the heat accumulating type single burner aluminum melting furnace 1.
The setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace 1 means that: in a frequently set working interval of the heat accumulating type single-burner aluminum melting furnace 1, the optimal air-fuel ratio is determined by taking the fastest temperature rise as a target or according to the flame characteristics of a hearth, and the optimal air-fuel ratio is taken as the set air-fuel ratio.
Or, the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace 1 means: selecting an optimal air-fuel ratio as an initial air-fuel ratio, and setting an upper temperature limit set value; and performing combustion control by using the optimal air-fuel ratio, and gradually changing the air-fuel ratio when the temperature reaches the upper temperature limit set value to finally determine the set air-fuel ratio.
Or, the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace 1 means: in an experience database of the work of the heat accumulating type single-burner aluminum melting furnace 1, values corresponding to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace are searched to calculate the air-fuel ratio, and the air-fuel ratio is used as the set air-fuel ratio.
In the conventional proportional control method, an operator sets a fixed air-fuel ratio according to the common sense and experience of operation; in the combustion stage of the aluminum melting furnace, the control system can automatically control the opening of the air regulating valve and the gas regulating valve according to the temperature of the hearth or the flue gas. The disadvantage of this control method is that the opening ratio of the air regulating valve and the gas regulating valve is kept fixed during the combustion process, and the flexibility is poor. In fact, the aluminum melting furnace has the characteristics of multi-coupling and strong nonlinearity, and uncertain factors such as gas pressure and heat value which influence the combustion characteristics of the aluminum melting furnace are numerous, so that the control mode of the fixed air-fuel ratio cannot ensure higher thermal efficiency in the whole combustion process. The invention adopts a combustion control mode with adjustable air-fuel ratio, changes the air-fuel ratio in real time according to the change conditions of the preheating temperature, namely the temperature of combustion-supporting air, the temperature of fuel gas, the temperature of a hearth and the temperature of exhaust smoke, and the air-fuel ratio is used as one of the input quantities of the air flow control unit to control and adjust the output quantity of the combustion-supporting air in the combustion-supporting air flow regulating valve 6 entering the heat accumulating type single-burner aluminum melting furnace 1, so that the system can better adapt to the change of the combustion characteristics of the aluminum melting furnace at different combustion stages, thereby achieving the purposes of saving energy, reducing consumption and improving the quality of aluminum melting.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A combustion control method of a heat accumulating type single-burner aluminum melting furnace with an adjustable air-fuel ratio is characterized by comprising the following steps:
Controlling the gas flow of gas in the gas flow regulating valve into the heat accumulating type single-burner aluminum melting furnace according to the real-time detected hearth temperature and the gas flow;
obtaining a real-time air-fuel ratio according to the real-time detected hearth temperature, the real-time detected exhaust gas temperature, the real-time detected combustion air temperature and the real-time detected fuel gas temperature, or setting the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace; and controlling the air flow of the combustion air in the combustion air flow regulating valve into the heat accumulating type single-burner aluminum melting furnace according to the air-fuel ratio and the combustion air flow detected in real time, so as to realize the real-time control and regulation of the gas flow and the air flow and improve the combustion heat efficiency of the heat accumulating type single-burner aluminum melting furnace.
2. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: setting initial hearth temperature and initial gas flow; the initial hearth temperature and the real-time detected hearth temperature are used as input quantities of a furnace temperature control unit to obtain a hearth temperature control quantity; the hearth temperature control quantity, the initial gas flow and the gas flow detected in real time are used as input quantities of a gas flow control unit, and the gas flow of gas in a gas flow control valve entering the heat accumulating type single-burner aluminum melting furnace is controlled through a gas flow control unit.
3. the combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: setting an initial air flow rate; the real-time detected hearth temperature, the smoke exhaust temperature, the combustion air temperature and the fuel gas temperature are used as input quantities of an air-fuel ratio control unit to obtain a real-time air-fuel ratio; the air-fuel ratio, the initial air flow and the air flow detected in real time are used as input quantities of an air flow control unit, and the air flow control unit is used for controlling the air flow of combustion air in a combustion air flow regulating valve into the heat accumulating type single-burner aluminum melting furnace.
4. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace is as follows: in a working interval which is usually set by a heat accumulating type single-burner aluminum melting furnace, the optimal air-fuel ratio is determined by taking the fastest temperature rise as a target or according to the flame characteristics of a hearth, and the optimal air-fuel ratio is taken as the set air-fuel ratio.
5. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace is as follows: selecting an optimal air-fuel ratio as an initial air-fuel ratio, and setting an upper temperature limit set value; and performing combustion control by using the optimal air-fuel ratio, and gradually changing the air-fuel ratio when the temperature reaches the upper temperature limit set value to finally determine the set air-fuel ratio.
6. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: the setting of the air-fuel ratio according to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace is as follows: and in an experience database of the work of the heat accumulating type single-burner aluminum melting furnace, searching numerical values corresponding to the combustion stage and the combustion mode of the heat accumulating type single-burner aluminum melting furnace to calculate the air-fuel ratio, wherein the air-fuel ratio is used as the set air-fuel ratio.
7. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: and a furnace temperature measuring thermocouple is arranged on the side wall of the middle part of the heat accumulating type single-burner aluminum melting furnace so as to detect the hearth temperature of the heat accumulating type single-burner aluminum melting furnace in real time.
8. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: and a smoke discharge temperature thermocouple is arranged at the smoke discharge position at the top of the heat accumulating type single-burner aluminum melting furnace so as to detect the smoke discharge temperature of the heat accumulating type single-burner aluminum melting furnace in real time.
9. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: a combustion-supporting fan and an air supply pipeline are arranged, and the combustion-supporting fan is connected with the heat accumulating type single-burner aluminum melting furnace through the air supply pipeline; the combustion air flow regulating valve is arranged on the air supply pipeline; and a combustion-supporting air temperature thermocouple is also arranged on the air supply pipeline so as to detect the temperature of combustion-supporting air entering the heat accumulating type single-burner aluminum melting furnace in real time.
10. The combustion control method of the heat accumulating type single burner aluminum melting furnace with the adjustable air-fuel ratio as claimed in claim 1, characterized in that: arranging a fuel gas supply device and a fuel gas supply pipeline, wherein the fuel gas supply device is connected with the heat accumulating type single-burner aluminum melting furnace through the fuel gas supply pipeline; the gas flow regulating valve is arranged on the gas supply pipeline; and a thermocouple for measuring the gas temperature is also arranged on the gas supply pipeline so as to detect the temperature of the gas entering the heat accumulating type single-burner aluminum melting furnace in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910916419.4A CN110566962A (en) | 2019-09-26 | 2019-09-26 | Combustion control method of heat accumulating type single-burner aluminum melting furnace with adjustable air-fuel ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910916419.4A CN110566962A (en) | 2019-09-26 | 2019-09-26 | Combustion control method of heat accumulating type single-burner aluminum melting furnace with adjustable air-fuel ratio |
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| CN111425857A (en) * | 2020-04-16 | 2020-07-17 | 苏州鼎佳炉窑科技有限公司 | Self-diagnosis control device and method for valve in heat accumulating type burner combustion system |
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Application publication date: 20191213 |