High-efficiency planar intermittent heating furnace

Abstract

The application discloses a high-efficiency planar intermittent heating furnace, which comprises a heating furnace body and a heating furnace chamber space formed by the heating furnace body; an internal heat insulation layer is arranged on the inner side of the heating furnace body, and an external heat insulation layer is arranged on the outer side of the heating furnace body; the heating furnace body is provided with a main fuel combustion nozzle, planar arrangement type combustion nozzles, a temperature measuring device, an oxygen content measuring device, a heating furnace door, a combustion tail gas outlet, various electromagnetic valves and corresponding fuel and air inlets; the planar arrangement type combustion nozzles are arranged on the upper, lower, left and right four sides of the heating furnace body; the electromagnetic valves of the fuel inlets and the air inlets are connected with the temperature measuring device and the oxygen content measuring device respectively; and the combustion tail gas outlet is arranged at the lower back of the heating furnace body. The main combustion nozzle and the uniform planar fuel combustion flame on the side are used as the heating heat source, the input power is regulated and controlled, the fuel supply mode is optimized, and the uniformity of the internal temperature distribution of the heating furnace chamber and the heating performance are improved.

Description

Technical Field

[0001] This invention relates to the field of thermal energy and power engineering technology, and in particular to a high-efficiency planar intermittent heating furnace. Background Technology

[0002] Industrial heating furnaces are essential equipment in industrial applications. They come in many varieties, are used on a large scale, and are energy-intensive, finding widespread application across various industries. They can account for up to 60% of industrial energy consumption. Currently, industrial heating furnaces in my country are primarily coal-fired. However, coal is a non-renewable energy source and emits large amounts of pollutants when burned. Therefore, finding alternative clean energy sources is urgently needed.

[0003] In recent years, to optimize my country's energy structure, the replacement of coal with natural gas has been vigorously promoted, with its production nearly doubling compared to ten years ago. The proportion of natural gas used in industrial heating furnaces is increasing. Studies have shown that the absolute heat utilization rate of natural gas in industrial heating furnaces can reach as high as 80%. However, due to the disadvantages of natural gas, such as slow flame propagation speed, poor combustion performance, and carbon emissions during combustion, its efficiency when directly burned in industrial heating furnaces is far lower than the theoretical value.

[0004] To address the shortcomings of common natural gas industrial heaters, optimization typically involves two aspects: co-firing fuels with better combustion performance and optimizing the heater structure. From the perspective of fuel optimization, hydrogen, as a carbon-free fuel, has a high energy density and produces no pollutants such as carbon dioxide upon complete combustion. Partially replacing natural gas with hydrogen can effectively reduce ignition energy, increase combustion temperature, accelerate combustion rate, and reduce carbon emissions, thereby significantly improving combustion efficiency. From the perspective of optimizing the heater structure, common natural gas heaters often suffer from uneven heating, meaning that the heating temperature near the wall gradually decreases as the flame propagates. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-efficiency planar intermittent heating furnace for wind and solar power needs. This device can form a uniformly heated gaseous hydrocarbon or hydrogen-blended fuel combustion flame in the heating furnace, which can improve fuel utilization and achieve energy saving and emission reduction while enhancing the uniformity of the high-temperature heating process.

[0006] This invention is achieved through the following technical solution: a high-efficiency planar intermittent heating furnace, comprising a heating furnace body and a heating furnace chamber space formed by the heating furnace body; an internal heat insulation layer is provided on the inner side of the heating furnace body, and an external heat insulation layer is provided on its outer side; the heating furnace body is provided with a main fuel combustion nozzle, a planar arrangement of combustion nozzles, a temperature measuring device, an oxygen content measuring device, a heating furnace door, a combustion exhaust gas outlet, various solenoid valves, and corresponding fuel and air inlets; the main fuel combustion nozzles are distributed on the front of the heating furnace body, with their nozzles facing the center of the heating furnace chamber space; the heating furnace door is located at the rear of the heating furnace body, and the main fuel combustion nozzles are positioned opposite the heating furnace door; several planar arrangement of combustion nozzles are provided, respectively distributed on the four sides of the heating furnace body; the solenoid valve of the fuel inlet is connected to the temperature measuring device, and the solenoid valve of the air inlet is connected to the oxygen content measuring device; the planar arrangement of combustion nozzles, the temperature measuring device, and the oxygen content measuring device are all located in the heating furnace chamber space within the heating furnace body, and the combustion exhaust gas outlet is located at the lower rear of the heating furnace body.

[0007] The main fuel combustion nozzles are distributed on the front of the furnace body, forming an elongated flame within the furnace chamber, constituting the main body of the furnace flame. Planar combustion nozzles are distributed on the four sides of the furnace body, forming uniform planar flames on all four sides. These planar combustion nozzles primarily inject less fuel, thus reducing temperature loss along the flame propagation direction. The solenoid valve at the fuel inlet is connected to a temperature measuring device, and the solenoid valve at the air inlet is connected to an oxygen content measuring device. By processing the corresponding temperature and oxygen content signals, the input of fuel and oxygen is specifically controlled. An internal insulation layer is located between the furnace body and the furnace chamber, preventing heat loss from the furnace chamber to the furnace body. An external insulation layer is located between the furnace body and the external environment, preventing heat loss from the furnace body to the external environment. The combustion exhaust gas outlet is located at the lower rear of the furnace body, discharging the combustion exhaust gas from the furnace chamber. This furnace body utilizes the uniform surface-shaped fuel combustion flame on the four sides of the heating furnace as an auxiliary heating heat source, which improves the uniformity of temperature distribution inside the heating furnace and enhances the heating performance of the furnace.

[0008] A water absorption device is installed inside the combustion exhaust gas outlet. Because the combustion products of hydrogen-infused fuel have a high water content, the amount of water vapor generated in the exhaust gas is large. Directly releasing high-temperature water vapor into the environment to form liquid water would be problematic. The water absorption device, by adding water-absorbing material, reduces the discharge of condensate in the exhaust gas.

[0009] The fuel injected into the heating furnace is at least one of gaseous hydrocarbons and gaseous pure hydrogen.

[0010] The volume of fuel injected by the planar combustion nozzle is one-eighth of the volume of fuel injected by the main fuel combustion nozzle.

[0011] The planar arrangement of combustion nozzles employs a diffusion burner. Each of the planar arrangement of combustion nozzles is evenly distributed on the wall of the heating furnace, with the spacing between them being 1.5 to 2 times the diameter of the main fuel combustion nozzle. The planar arrangement of combustion nozzles, using a diffusion burner, forms a planar flame through diffusion, thereby achieving the same heating effect with reduced fuel input and enhancing temperature uniformity within the heating furnace.

[0012] The spacing between the planar combustion nozzles located on opposite surfaces and in opposite positions is 1 to 1.5 times the maximum outer diameter of the main fuel combustion nozzle.

[0013] The injection direction of the planar arrangement of combustion nozzles is perpendicular to the injection direction of the main fuel combustion nozzles.

[0014] The combustion exhaust gas outlet is located in a horizontal direction at a distance of 5 to 10 times the diameter of the main fuel combustion nozzle from the planar arrangement of the combustion nozzles closest to the furnace door on that side.

[0015] The inner diameter of the combustion exhaust outlet is the same as the diameter of the main fuel combustion nozzle.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) Fuel gas (natural gas, hydrogen, or a mixture of both) and air pass through an injection nozzle suitable for diffusion combustion, forming a uniformly distributed fuel gas and air distribution in a planar manner, which can form a uniformly distributed planar combustion flame of natural gas, hydrogen, or a mixture of both. This improves the adaptability of the combustion nozzle to the combustion raw materials, alleviates the problem of the temperature decreasing along the propagation direction near the wall in the main fuel combustion zone, and enhances the temperature uniformity during fuel combustion.

[0018] (2) The fuel and air components injected in the planar combustion nozzles are the same, and the flame combustion process on adjacent planar nozzles has the same combustion atmosphere, thereby improving the combustion stability of adjacent flames on the planar burner.

[0019] (3) By rationally setting the structure of the main fuel combustion nozzle and the surface-arranged combustion nozzle, stable combustion of fuel gas (natural gas, hydrogen, and mixtures thereof) can be achieved. According to the required operating conditions of the industrial heating furnace, the burner structure that can stably burn under different fuel composition conditions is adjusted, thereby achieving stable combustion and a uniform temperature atmosphere under a wider range of fuel composition conditions.

[0020] (4) Furthermore, by measuring the temperature and oxygen content near the wall surface and comparing the difference with the set value, the solenoid valves at the fuel and air inlets are controlled separately to regulate the intake volume of fuel and air. Therefore, a good heating effect can be achieved with reduced fuel input, thereby realizing energy saving and emission reduction and improving energy utilization. Attached Figure Description

[0021] Figure 1 This is a front view of an embodiment of the present invention;

[0022] Figure 2 This is a left view of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the planar arrangement combustion nozzle according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the main fuel combustion nozzle according to an embodiment of the present invention;

[0025] Figure 5a Temperature field distribution diagram of 100kW mixed fuel injected and burned only from the main fuel nozzle in an embodiment of the present invention;

[0026] Figure 5b Temperature field distribution diagram for combustion of 25kW mixed fuel injected only from the main fuel nozzle in an embodiment of the present invention;

[0027] Figure 5c The temperature field distribution diagram for combustion of 10kW of mixed fuel injected only from the main fuel nozzle in an embodiment of the present invention.

[0028] The following are the meanings of the reference numerals in the diagram: 1. Main fuel combustion nozzle; 2. Planar arrangement combustion nozzle; 3. Temperature measuring device; 4. Oxygen content measuring device; 5. Internal insulation layer; 6. Heating furnace body; 7. External insulation layer; 8. Heating furnace door; 9. Heating furnace chamber space; 10. Combustion exhaust gas outlet; A0. Air inlet of the main burner; F0. Fuel inlet of the main burner; A0'. Air outlet of the main burner; F0'. Fuel outlet of the main burner; A11. Air inlet of the first row of planar arrangement burners on the upper wall of the heating furnace; F11. Fuel inlet of the first row of planar arrangement burners on the upper wall of the heating furnace; e11. Air inlet solenoid valve of the first row of planar arrangement burners on the upper wall of the heating furnace; E11. Fuel inlet solenoid valve of the first row of planar arrangement burners on the upper wall of the heating furnace; A1 i The air inlet of the i-th column of planar burners on the upper wall of the heating furnace; F1 i The fuel inlet of the i-th column of planar burners on the upper wall of the heating furnace; e1 iThe air inlet solenoid valve of the i-th column of planar burners on the upper wall of the heating furnace; E1 i A1 is the fuel inlet solenoid valve for the i-th column of planar burners on the upper wall of the heating furnace. n The air inlet of the nth column of planar burners on the upper wall of the heating furnace; F1 n The fuel inlet of the nth column of planar burners on the upper wall of the heating furnace; e1 n The air inlet solenoid valve of the nth column of planar burners on the upper wall of the heating furnace; E1 n A21, the fuel inlet solenoid valve of the nth row of planar burners on the upper wall of the heating furnace; A22, the air inlet of the first row of planar burners on the lower wall of the heating furnace; F21, the fuel inlet of the first row of planar burners on the lower wall of the heating furnace; e21, the air inlet solenoid valve of the 1st row of planar burners on the lower wall of the heating furnace; E21, the fuel inlet solenoid valve of the 1st row of planar burners on the lower wall of the heating furnace; A2 i The air inlet of the i-th column of planar burners on the lower wall of the heating furnace; F2 i The fuel inlet of the i-th column of planar burners on the lower wall of the heating furnace; e2 i , The air inlet solenoid valve of the i-th column of planar burners on the lower wall of the heating furnace; E2 i 1. The fuel inlet solenoid valve of the i-th column of the planar burners on the lower wall of the heating furnace; A2 n The air inlet of the nth column of planar burners on the lower wall of the heating furnace; F2 n The fuel inlet of the nth column of planar burners on the lower wall of the internal heating furnace; e2 n The air inlet solenoid valve of the nth column of planar burners on the lower wall of the heating furnace; E2 n AX is the fuel inlet solenoid valve for the nth column of planar burners on the lower wall of the heating furnace. L1 (Where X = 1, 2, 3, 4) represent the air inlets of the planar burners arranged on the left side of the upper, lower, left, or right wall of the heating furnace, respectively; AX R1 (Where X = 1, 2, 3, 4) represent the air inlets of the planar burners arranged on the right side of the upper, lower, left, or right wall of the heating furnace; eX L1 (Where X = 1, 2, 3, 4) are the solenoid valves for the air inlets of the planar burners located on the left side of the upper, lower, left, or right wall of the heating furnace; AX R1 (Where X = 1, 2, 3, 4) are the solenoid valves for the air inlets of the planar burners located on the right side of the upper, lower, left, or right wall of the heating furnace; FX L1(Where X = 1, 2, 3, 4) represent the fuel inlets of the planar burners arranged on the left side of the upper, lower, left, or right wall of the heating furnace, respectively; FX R1 (Where X = 1, 2, 3, 4) represent the fuel inlets of the planar burners arranged on the right side of the upper, lower, left, or right wall of the heating furnace, respectively; EX L1 (Where X = 1, 2, 3, 4) are the solenoid valves for the fuel inlets of the planar burners located on the left side of the upper, lower, left, or right wall of the heating furnace; EX R1 (Where X = 1, 2, 3, 4) are the solenoid valves of the fuel inlet of the planar burner arranged on the right side of the upper, lower, left or right wall of the heating furnace. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] Example

[0031] See Figures 1 to 4 This is a high-efficiency planar intermittent heating furnace, comprising a heating furnace body 6 and a heating furnace chamber space 9 formed by the heating furnace body 6; the inner side of the heating furnace body 6 is provided with an internal heat insulation layer 5, and the outer side is provided with an external heat insulation layer 7; the heating furnace body 6 is provided with a main fuel combustion nozzle 1, a planar arrangement of combustion nozzles 2, a temperature measuring device 3, an oxygen content measuring device 4, a heating furnace door 8, a combustion exhaust gas outlet 10, various solenoid valves, and corresponding fuel and air inlets; the main fuel combustion nozzles 1 are distributed on the front of the heating furnace body 6, with their nozzles facing the heating furnace chamber space 9. At the center, the furnace door 8 is located behind the furnace body 6, and the main fuel combustion nozzle 1 is opposite to the furnace door 8; several planar combustion nozzles 2 are provided, which are distributed on the four sides of the furnace body 6, above, below, left, and right; the solenoid valve of the fuel inlet is connected to the temperature measuring device 3, and the solenoid valve of the air inlet is connected to the oxygen content measuring device 4; the planar combustion nozzles 2, the temperature measuring device 3, and the oxygen content measuring device 4 are all located in the furnace chamber space 9 inside the furnace body 6, and the combustion exhaust gas outlet 10 is located at the lower rear of the furnace body 6.

[0032] The main fuel combustion nozzles 1 are distributed on the front of the heating furnace body 6, forming an elongated flame within the heating furnace space 9, constituting the main part of the heating furnace flame (main temperature field); the planar arrangement of combustion nozzles 2 are distributed on the four sides of the heating furnace body 6, forming a uniform planar flame on all four sides within the heating furnace space 9, thereby compensating for temperature and improving the temperature uniformity within the heating furnace; the planar arrangement of combustion nozzles 2 mainly injects less fuel, thus reducing temperature loss along the flame propagation direction; the solenoid valve at the fuel inlet is connected to the temperature measuring device 3, and the air... The inlet solenoid valve is connected to the oxygen content measuring device 4, which processes the corresponding temperature and oxygen content signals to selectively regulate the input of fuel and oxygen. The internal insulation layer 5 is located between the furnace body 6 and the furnace chamber space 9, preventing heat loss from the furnace chamber space 9 to the furnace body 6. The external insulation layer 7 is located between the furnace body 6 and the external environment, preventing heat loss from the furnace body 6 to the external environment. The combustion exhaust gas outlet 10 is located at the lower rear of the furnace body 6, discharging the combustion exhaust gas from the furnace chamber. This furnace utilizes the uniform surface-shaped fuel combustion flames on the four sides of the furnace chamber as an auxiliary heating source, improving the uniformity of temperature distribution within the furnace chamber and enhancing the heating performance of the furnace.

[0033] A water absorption device is installed inside the combustion exhaust outlet 10. Because the combustion products of hydrogen-blended fuel have a high water content, the amount of water vapor generated in the exhaust gas is large. Directly releasing high-temperature water vapor into the environment to form liquid water would be problematic. The water absorption device, by adding water-absorbing material, reduces the discharge of condensate in the exhaust gas.

[0034] The fuel injected into the heating furnace body 6 is at least one of gaseous hydrocarbons and gaseous pure hydrogen.

[0035] The volume of fuel injected by the planar combustion nozzle 2 is one-eighth of the volume of fuel injected by the main fuel combustion nozzle 1.

[0036] The planar arrangement of the combustion nozzles 2 employs a diffusion burner. Each planar arrangement of the combustion nozzles 2 is evenly distributed on the wall of the heating furnace body 6, with the spacing between them being 1.5 to 2 times the diameter of the main fuel combustion nozzle 1. The planar arrangement of the combustion nozzles 2 uses a diffusion burner to form a planar flame through diffusion, thereby achieving the same heating effect with reduced fuel input and enhancing the temperature uniformity within the heating furnace.

[0037] The spacing between the planar combustion nozzles 2 located on opposite surfaces and in opposite positions is 1 to 1.5 times the maximum outer diameter of the main fuel combustion nozzle 1.

[0038] The injection direction of the planar combustion nozzle 2 is perpendicular to the injection direction of the main fuel combustion nozzle 1.

[0039] The combustion exhaust gas outlet 10 is located in the horizontal direction at a distance of 5 to 10 times the diameter of the main fuel combustion nozzle 1 from the planar arrangement of combustion nozzles 2 closest to the heating furnace door 8 on that side.

[0040] The inner diameter of the combustion exhaust outlet 10 is the same as the diameter of the main fuel combustion nozzle 1.

[0041] In this embodiment, the temperature measuring device 3, the oxygen content measuring device 4, the water absorption device, and the drive circuits or drive units driving each device are all existing technologies, so there is no need to conduct a detailed structural analysis. The planar arrangement of the combustion nozzles 2 adopts a diffusion burner. Individually, a diffusion burner is an existing device; this application has made partial design adjustments, only setting the arrangement to achieve the desired technical effect. Therefore, no specific structural analysis is needed for a single planar arrangement of the combustion nozzles 2. A burner designed according to the diffusion combustion method is called a diffusion burner. The primary air coefficient α of a diffusion burner is 0, and the air required for combustion is supplied during the combustion process. Depending on the air supply method, diffusion burners can be divided into two types: naturally induced draft and forced draft. The former is mostly used in civilian applications, while the latter is mostly used in industrial applications. The diffusion burner is designed based on the principle of diffusion combustion. Fuel is injected into the furnace through a gas nozzle, and the combustion air mixes with the fuel and burns in the furnace. Diffusive burners are characterized by stable combustion, no backfire issues, reliable operation, simple structure, and the ability to utilize low-pressure fuel gas. However, they produce a longer flame and require a larger combustion space. To ensure better fuel-air mixing, diffuser burners typically divide the fuel into multiple fine streams, increasing the contact area with air, or create an angle or swirling flow between the air and fuel gas, increasing mutual turbulence and thus improving fuel-air mixing.

[0042] This paper analyzes and describes the specific structures of the main fuel combustion nozzle 1 and the planar arrangement combustion nozzle 2. To better demonstrate the specific structural design of this application and avoid confusion caused by overlapping structural components, the following content refers to the main fuel combustion nozzle 1 as the main burner and the planar arrangement combustion nozzle 2 as the planar arrangement burner. The inlet, outlet, and solenoid valves of the two burners are described as follows: A0 is the air inlet of the main burner; F0 is the fuel inlet of the main burner; A0' is the air outlet of the main burner; F0' is the fuel outlet of the main burner; A11 is the air inlet of the first row of planar arrangement burners on the upper wall of the heating furnace; F11 is the fuel inlet of the first row of planar arrangement burners on the upper wall of the heating furnace; e11 is the air inlet solenoid valve of the first row of planar arrangement burners on the upper wall of the heating furnace; E11 is the fuel inlet solenoid valve of the first row of planar arrangement burners on the upper wall of the heating furnace; A1 i F1 is the air inlet for the i-th column of planar burners on the upper wall of the heating furnace. i e1 is the fuel inlet for the i-th column of planar burners on the upper wall of the heating furnace; i E1 is the air inlet solenoid valve for the i-th column of planar burners on the upper wall of the heating furnace; i A1 is the fuel inlet solenoid valve for the i-th column of planar burners on the upper wall of the heating furnace; n F1 is the air inlet for the nth column of the planar burners on the upper wall of the heating furnace. n e1 is the fuel inlet for the nth column of planar burners on the upper wall of the heating furnace. n E1 is the air inlet solenoid valve for the nth column of planar burners on the upper wall of the heating furnace. n A21 is the fuel inlet solenoid valve for the nth row of planar burners on the upper wall of the heating furnace; A21 is the air inlet for the first row of planar burners on the lower wall of the heating furnace; F21 is the fuel inlet for the first row of planar burners on the lower wall of the heating furnace; e21 is the air inlet solenoid valve for the 1st row of planar burners on the lower wall of the heating furnace; E21 is the fuel inlet solenoid valve for the 1st row of planar burners on the lower wall of the heating furnace; A2 i F2 is the air inlet for the i-th column of planar burners on the lower wall of the heating furnace. i e2 is the fuel inlet for the i-th column of planar burners on the lower wall of the heating furnace; i E2 is the air inlet solenoid valve for the i-th column of planar burners on the lower wall of the heating furnace; i A2 is the fuel inlet solenoid valve for the i-th column of planar burners on the lower wall of the heating furnace; n F2 is the air inlet for the nth column of the planar burners on the lower wall of the heating furnace. ne2 is the fuel inlet for the nth column of planar burners on the lower wall of the internal heating furnace; n E2 is the air inlet solenoid valve for the nth column of planar burners on the lower wall of the heating furnace. n AX is the fuel inlet solenoid valve for the nth column of planar burners on the lower wall of the heating furnace. L1 (Where X = 1, 2, 3, 4) represent the air inlets of the planar burners arranged on the left side of the upper, lower, left, or right wall of the heating furnace, respectively; AX R1 (Where X = 1, 2, 3, 4) represent the air inlets of the planar burners arranged on the right side of the upper, lower, left, or right wall of the heating furnace; eX L1 (Where X = 1, 2, 3, 4) are the solenoid valves for the air inlets of the planar burners located on the left side of the upper, lower, left, or right wall of the heating furnace; AX R1 (Where X = 1, 2, 3, 4) are the solenoid valves for the air inlets of the planar burners located on the right side of the upper, lower, left, or right wall of the heating furnace; FX L1 (Where X = 1, 2, 3, 4) represent the fuel inlets of the planar burners arranged on the left side of the upper, lower, left, or right wall of the heating furnace, respectively; FX R1 (Where X = 1, 2, 3, 4) represent the fuel inlets of the planar burners arranged on the right side of the upper, lower, left, or right wall of the heating furnace, respectively; EX L1 (Where X = 1, 2, 3, 4) are the solenoid valves for the fuel inlets of the planar burners located on the left side of the upper, lower, left, or right wall of the heating furnace; EX R1 (Where X = 1, 2, 3, 4) are the solenoid valves of the fuel inlet of the planar burner arranged on the right side of the upper, lower, left or right wall of the heating furnace.

[0043] See Figures 1 to 4 This application provides a high-efficiency planar arrangement industrial heater (high-efficiency planar intermittent heater) suitable for natural gas, hydrogen, and mixed fuels. Fuel and air can be ejected from either the main combustion nozzle or from the planar arrangement combustion nozzle 2, improving fuel utilization and forming a uniform heating temperature field.

[0044] See Figure 1 , Figure 1This paper demonstrates the structure of a high-efficiency planar intermittent industrial heater suitable for natural gas, hydrogen, and mixtures of both fuels. It includes a main fuel combustion nozzle 11 and planar combustion nozzles 2 distributed around the perimeter. The main fuel combustion nozzle 11 forms most of the diffusion flame required for heating by connecting the air inlet A0 and the fuel inlet F0 of the main burner. The planar combustion nozzles 2 arranged on each of the perimeter surfaces mainly form supplementary planar diffusion flames on each wall surface by connecting the air inlet and the fuel inlet, thereby mitigating the problem of uneven temperature distribution caused by heat loss. The planar combustion nozzles 2 all adopt a structure suitable for diffusion combustion, which effectively mitigates backfire problems and improves the stability of combustion of natural gas, hydrogen, and mixtures of both fuels by separating the combustion of fuel and air.

[0045] Figure 2 This is a cross-sectional view of the high-efficiency planar arrangement industrial heating furnace (high-efficiency planar intermittent heating furnace), with four identical planar diffusion flames distributed on four faces perpendicular to the main burner. Furthermore, to ensure that the planar flames provide consistent heating effect, the shape of the furnace's cross-section is as close to a square as possible. Figure 3 It has the structure of a planar burner; Figure 4 It is a non-premixed main burner structure.

[0046] It should be noted that the number and arrangement of the planar fuel nozzles designed in this application can be adjusted according to specific application conditions. For example... Figure 3 As shown, in this embodiment, the burners (planar fuel nozzles) on the wall of the heating furnace are composed of multiple small burners with identical structures. The spacing between the nozzles in each small burner and the combination of different burners can be adjusted according to the actual situation.

[0047] As an optional implementation, in some embodiments, it includes a main fuel combustion nozzle 1 and a planar arrangement of combustion nozzles 2 distributed around the perimeter. Figure 1 The figure shows an example of the structural design of an industrial heating furnace in an implementation case of this application, wherein the main fuel combustion nozzle 1 has four facets of surface-arranged combustion nozzles 2 installed in the vertical direction.

[0048] As an optional implementation, some embodiments include an arrangement of a main fuel combustion nozzle 1 and a surrounding planar arrangement of combustion nozzles 2. The nozzle size of the main fuel combustion nozzle 1 is designed primarily based on the specific heating conditions. The nozzles of the planar arrangement heater are equidistantly spaced, with the distance between adjacent nozzles being 1.5-2 times the main fuel combustion nozzle 1. Furthermore, the spacing between the opposing planar arrangement of combustion nozzles 2 is 1-1.5 times the maximum outer diameter of the main fuel combustion nozzle 1.

[0049] As an optional implementation, in some embodiments, the amount of fuel input by the planar combustion nozzle 2 is determined by the measured temperature near the wall and the difference between it and the set temperature; the amount of air input is regulated by judging whether the measured oxygen content meets the set equivalence ratio.

[0050] As an optional implementation, in some embodiments, the housing materials of the main fuel combustion nozzle 1 and the planar arrangement combustion nozzle 2 include, but are not limited to, copper, titanium alloy, and stainless steel.

[0051] As an alternative implementation, in some instances, the combustion exhaust gas outlet 10 containing the water absorption device should be located in the horizontal direction at a distance of 5-10 times the diameter of the main fuel combustion nozzle 1 from the surface-arranged combustion nozzles 2 closest to the heating furnace door 8.

[0052] Figures 5a to 5c This is a combustion simulation diagram (combustion effect comparison diagram) of one type of high-efficiency planar intermittent industrial heating furnace (high-efficiency planar intermittent heating furnace). The furnace measures 2.4m in length, 10m in width, and 1.4m in height. Planar combustion nozzles 2 are installed on the side of the furnace (combustion furnace), with a spacing of 2m between adjacent nozzles. Figure 5a Temperature field distribution diagram for combustion of an 80% CH4 / 20% H2 mixed fuel with a heating power of 100kW, injected only from the main fuel nozzle. Figure 5a As can be seen, the temperature distribution is uneven along the direction of flame propagation. Figure 5b The main burner uses the same composition fuel with a heating power of 25kW, and auxiliary surface nozzles with a power of approximately 3.125kW are arranged at equal intervals of 2m along the flow direction. From Figure 5b As can be seen, under a total load of 50kW, the temperature field generated by fuel combustion is significantly higher than that of fuel combustion. Figure 5a It is more uniform, which not only saves fuel input but also improves the uniformity of heating. Figure 5c The main burner is fed with fuel with a heating power of 10kW, and the auxiliary nozzles with a power of about 1.25kW are arranged at equal intervals of 2m. As can be seen from the figure, even with about one-fifth of the fuel being fed into the main burner, the heating effect of the high-efficiency planar arrangement industrial heating furnace (high-efficiency planar intermittent heating furnace) is still good.

[0053] This embodiment controls the fuel input by comparing the measured temperature near the wall with the set temperature of the main heating zone. Then, based on the measured oxygen content near the wall, it determines whether the equivalence ratio at that location matches the preset equivalence ratio, and subsequently controls the air input by adjusting the air input. By regulating the fuel and air input, the impact of uneven heating caused by near-wall losses in the heating furnace is reduced. The drive circuits in the fuel and air inlets are controlled by processing the temperature and oxygen content signals at corresponding locations of each burner unit, thereby regulating the compensation power of the planar burner (planar combustion nozzle 2).

[0054] By improving the structure and rationally setting and distributing the burner's heating power, a uniform heating temperature field can be formed while saving energy, effectively improving fuel utilization. This embodiment is applicable to high-efficiency industrial heating furnaces for the combustion of natural gas, hydrogen fuel, and their mixtures, contributing to the achievement of energy conservation and emission reduction goals and showing promising prospects.

[0055] The above detailed description is a specific description of feasible embodiments of the present invention. These embodiments are not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the patent scope of this case.

Claims

1. A high-efficiency planar intermittent heating furnace, characterized in that: The furnace includes a heating furnace body and the heating furnace chamber space formed by the heating furnace body; the inner side of the heating furnace body is provided with an internal heat insulation layer, and its outer side is provided with an external heat insulation layer; the heating furnace body is provided with a main fuel combustion nozzle, a planar arrangement of combustion nozzles, a temperature measuring device, an oxygen content measuring device, a heating furnace door, a combustion exhaust gas outlet, various solenoid valves, and corresponding fuel and air inlets; the main fuel combustion nozzles are distributed on the front of the heating furnace body, with their nozzles facing the center of the heating furnace chamber space; the heating furnace door is located at the rear of the heating furnace body, and the main fuel combustion nozzles are positioned opposite the heating furnace door; the planar arrangement of combustion nozzles... Several nozzles are provided, distributed on the four sides of the heating furnace body, namely the top, bottom, left, and right. The solenoid valve of the fuel inlet is connected to the temperature measuring device, and the solenoid valve of the air inlet is connected to the oxygen measuring device. The planar arrangement of combustion nozzles, the temperature measuring device, and the oxygen measuring device are all located in the heating furnace chamber space inside the heating furnace body. The combustion exhaust gas outlet is located at the rear lower part of the heating furnace body. The planar arrangement of combustion nozzles adopts a diffusion burner. Each planar arrangement of combustion nozzle is evenly distributed on the wall of the heating furnace body, and the interval distance is 1.5 to 2 times the diameter of the main fuel combustion nozzle.

2. The high-efficiency planar intermittent heating furnace according to claim 1, characterized in that: A water suction device is installed inside the combustion exhaust gas outlet.

3. The high-efficiency planar intermittent heating furnace according to claim 1, characterized in that: The fuel injected into the heating furnace is at least one of gaseous hydrocarbons and gaseous pure hydrogen.

4. The high-efficiency planar intermittent heating furnace according to claim 3, characterized in that: The volume of fuel injected by the planar combustion nozzle is one-eighth of the volume of fuel injected by the main fuel combustion nozzle.

5. The high-efficiency planar intermittent heating furnace according to claim 1, characterized in that: The spacing between the planar arrangement of combustion nozzles located on opposite surfaces and in opposite positions is 1 to 1.5 times the maximum outer diameter of the main fuel combustion nozzle.

6. The high-efficiency planar intermittent heating furnace according to claim 1, characterized in that: The injection direction of the planar arrangement of combustion nozzles is perpendicular to the injection direction of the main fuel combustion nozzles.

7. The high-efficiency planar intermittent heating furnace according to claim 1, characterized in that: The combustion exhaust gas outlet is located in a horizontal direction at a distance of 5 to 10 times the diameter of the main fuel combustion nozzle from the planar arrangement of the combustion nozzles closest to the furnace door on that side.

8. The high-efficiency planar intermittent heating furnace according to claim 1, characterized in that: The inner diameter of the combustion exhaust outlet is the same as the diameter of the main fuel combustion nozzle.

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