Plasma gas heating furnace

Abstract

The application discloses a plasma gas heating furnace, and relates to the technical field of heating furnaces.The heating furnace is of an inner-outer sleeve structure, and comprises a furnace body inner sleeve, which is a plasma gas passage and is provided with a gas outlet; a furnace body outer sleeve, which is a working gas passage and is sleeved on the outer side of the furnace body inner sleeve and is in communication with the furnace body inner sleeve; and an arc plasma torch, which is arranged at the end of the furnace body inner sleeve far from the gas outlet; and an air inlet assembly, which is arranged in communication with the furnace body outer sleeve and is used for feeding working gas into the furnace body outer sleeve. The arc plasma torch is used for spraying high-temperature plasma jet into the furnace body, and the working gas fed from the air inlet assembly is mixed with the high-temperature plasma jet to form target gas, so that high-temperature inert gas heated by electric energy is used to replace high-temperature flue gas generated by combustion of fossil fuel, a heat source is provided for an industrial furnace, and nearly zero carbon dioxide emission is realized in the whole heating process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating furnace, in particular to a plasma gas heating furnace. BACKGROUND

[0002] The heating furnace is applied in many industries such as petroleum, chemical industry, metallurgy, machinery, heat treatment, surface treatment, building materials, electronics, materials, light industry, daily chemical industry, and pharmaceutical industry. At present, the heating furnace in the oil refining and chemical industry usually uses fossil fuel combustion to heat. A large amount of carbon dioxide is emitted during the combustion of fossil fuel, which cannot meet the requirement of carbon dioxide emission reduction.

[0003] If electric power is used to replace traditional fossil fuel gas during the heating process, the emission of carbon dioxide can be greatly reduced. However, the heating furnace in the refining and chemical industry has the characteristics of large total power, high furnace temperature, large medium processing capacity, and long-term stability. The existing electric heating device cannot meet the above characteristics of the heating furnace. SUMMARY

[0004] The purpose of the present application is to provide a plasma gas heating furnace to solve the technical problem that the electric heating device cannot meet the characteristics of large total power, high furnace temperature, large medium processing capacity, and long-term stability of the heating furnace to some extent.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] The first aspect of the embodiment of the present application provides a plasma gas heating furnace. The heating furnace has an inner and outer sleeve structure. The plasma gas heating furnace comprises: a furnace body inner cylinder, which is a plasma gas passage, and is provided with a gas outlet; a furnace body outer cylinder, which is a working gas passage, is sleeved outside the furnace body inner cylinder, and is in communication with the furnace body inner cylinder; an electric arc plasma torch, which is arranged at one end of the furnace body inner cylinder away from the gas outlet; and a gas inlet assembly, which is arranged in communication with the furnace body outer cylinder, and is used for introducing working gas into the furnace body outer cylinder.

[0007] In some embodiments, the furnace body inner cylinder is provided with a plurality of rows of through holes arranged in a staggered manner and in communication with the furnace body outer cylinder.

[0008] In some embodiments, the diameters of the through holes in each row gradually increase from the electric arc plasma torch to the gas outlet.

[0009] In some embodiments, the heating furnace further comprises an adjusting cylinder, which is movably sleeved on the furnace body inner cylinder, and the diameters of the through holes are adjusted by sliding the adjusting cylinder on the outer wall of the furnace body inner cylinder.

[0010] In some embodiments, the first mounting plate is provided at one end of the furnace inner cylinder away from the gas outlet, and at least one arc plasma torch is arranged on the first mounting plate.

[0011] In some embodiments, an isolation unit is arranged on the arc plasma torch, and the isolation unit is used for quick sealing between the first mounting plate when the arc plasma torch is dismounted or mounted online.

[0012] In some embodiments, the second mounting plate is provided at one end of the furnace outer cylinder corresponding to the first mounting plate, and the gas inlet assembly including at least one gas inlet is arranged on the second mounting plate.

[0013] In some embodiments, the number of the gas inlets is more than 3, and the gas inlets are uniformly distributed around the arc plasma torch in the circumferential direction.

[0014] In some embodiments, the furnace inner cylinder is a cylinder in the low-temperature gas heating section, and the furnace outer cylinder is a cone, and the diameter of the cone gradually decreases from the gas inlet assembly to the gas outlet.

[0015] In some embodiments, the cone angle of the cone is 0°-60°.

[0016] In some embodiments, at least one temperature sensing unit is arranged on the furnace inner cylinder at the gas outlet.

[0017] According to the above technical solution, the present application has at least the following advantages and positive effects:

[0018] In the present application, the arc plasma torch is used to inject high-temperature plasma jet into the furnace, and the working gas introduced from the gas inlet assembly is mixed with the high-temperature plasma jet to form the target gas, so that the high-temperature inert gas heated by electric energy is used to replace the high-temperature flue gas generated by the combustion of fossil fuels, and the heat source is provided for the industrial furnace, and the entire heating process is almost zero carbon dioxide emission; at the same time, the working gas is introduced into the furnace inner cylinder, on the one hand, the temperature of the furnace inner cylinder is reduced through heat conduction, and on the other hand, the flowing working gas film layer is formed on the cylinder wall of the furnace inner cylinder, so that the low-temperature furnace inner cylinder is prevented from being scoured by the high-temperature plasma jet, the furnace inner cylinder is prevented from being burned out, and the service life and safety of the equipment are improved. In addition, the working gas is introduced into the furnace inner cylinder in a stepped manner, so that the mixing distance of the cold and hot gases is shortened, and the uniformity of the outlet gas temperature is ensured.

[0019] The application discloses a plasma gas heating furnace, which generates uniform high-temperature gas through an arc plasma torch, has the characteristics of large power, high heating temperature, real-time adjustment and continuous and stable working, and can be used as a heat source of various industrial furnaces. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a plasma gas heating furnace according to an embodiment;

[0022] Figure 2 FIG. 2 is a sectional view of the plasma gas heating furnace according to the embodiment;

[0023] Figure 3 FIG. 3 is a structural schematic diagram of an inner cylinder of the furnace body of the plasma gas heating furnace according to the embodiment;

[0024] Figure 4 FIG. 4 is an installation schematic diagram of the plasma gas heating furnace provided with one arc plasma torch according to the embodiment;

[0025] Figure 5 FIG. 5 is an installation schematic diagram of the plasma gas heating furnace provided with two arc plasma torches according to the embodiment;

[0026] Figure 6 FIG. 6 is an installation schematic diagram of the plasma gas heating furnace provided with three arc plasma torches according to the embodiment;

[0027] Figure 7 FIG. 7 is an installation schematic diagram of the plasma gas heating furnace provided with four arc plasma torches according to the embodiment.

[0028] The reference signs are explained as follows: 1, arc plasma torch; 2, gas inlet; 3, first mounting plate; 4, outer cylinder of furnace body; 5, inner cylinder of furnace body; 6, temperature sensing unit; 7, gas outlet; 8, isolation unit; 9, second mounting plate; and 10, adjusting cylinder. DETAILED DESCRIPTION

[0029] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "communication", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Please refer to Figure 1 and Figure 2 .

[0034] Figure 1 is a structural schematic diagram of a plasma gas heating furnace in the embodiments of the present application, Figure 2The application discloses a sectional view of a plasma gas heating furnace, and the heating furnace is in a sleeve structure, and the plasma gas heating furnace comprises a furnace body inner sleeve 5 which is a plasma gas channel, and an air outlet 7 is arranged on the furnace body inner sleeve 5; a furnace body outer sleeve 4 which is a working gas channel is sleeved outside the furnace body inner sleeve 5, and the furnace body outer sleeve 4 is communicated with the furnace body inner sleeve 5; an arc plasma torch 1 is arranged at one end of the furnace body inner sleeve 5 which is far away from the air outlet 7; and an air inlet assembly is arranged on the furnace body outer sleeve 4 and is communicated with the furnace body outer sleeve 4 and is used for feeding working gas into the furnace body outer sleeve 4. The arc plasma torch 1 is used for spraying high-temperature plasma jet into the furnace body, the working gas fed from the air inlet assembly is mixed with the high-temperature plasma jet to form target gas, the high-temperature inert gas heated by electric energy is used to replace high-temperature flue gas generated by combustion of fossil fuel, a heat source is provided for an industrial furnace, and nearly zero carbon dioxide emission is realized in the whole heating process. Meanwhile, the working gas is fed into the furnace body inner sleeve 5, and a flowing working gas film layer is formed on the wall of the furnace body inner sleeve 5, so that the temperature of the furnace body inner sleeve 5 is reduced, the furnace body inner sleeve 5 is prevented from being scoured by the high-temperature plasma jet, the furnace body inner sleeve 5 is prevented from being burnt out, and the service life and safety of the equipment are improved. The arc plasma torch 1 is used for generating uniform high-temperature gas, has the characteristics of large power, high heating temperature, real-time adjustment and continuous and stable work, and can be used as a heat source of various industrial furnaces. Meanwhile, the plasma gas heating furnace has high applicability, a large power adjustment range, realizes temperature adjustment and gas quantity adjustment of high-temperature gas, can provide part or all of heat sources for an industrial furnace, and meets the process requirements of the industrial furnace.

[0035] Please refer to Figure 3 .

[0036] In some embodiments, the furnace inner cylinder 5 is provided with multiple rows of staggered annular through holes, and the working gas is introduced into the furnace inner cylinder 5 in stages through the through holes in each row after being introduced into the furnace outer cylinder 4. In the specific implementation of the present embodiment, the working gas enters the furnace inner cylinder 5 from the side close to the gas inlet 2 first, and then enters the furnace inner cylinder 5 from the through holes in each row in turn, so that the working gas is introduced into the furnace inner cylinder 5 in stages, which can shorten the mixing distance of the working gas and the high-temperature plasma jet while ensuring the uniformity of the temperature of the target gas sprayed from the gas outlet 7; the staggered arrangement between the through holes in each row can ensure that the working gas enters the furnace inner cylinder 5 from different positions and fully mixes with the high-temperature plasma jet; the working gas enters the furnace inner cylinder 5 through each through hole to form a flowing working gas film layer on the wall of the furnace inner cylinder 5, which can reduce the temperature of the furnace inner cylinder 5 and avoid the low-temperature furnace inner cylinder 5 from being scoured by the high-temperature plasma jet, thereby preventing the furnace inner cylinder 5 from being burned out and improving the service life and safety of the equipment. The number and size of the through holes of the furnace inner cylinder 5 are determined according to the actual gas volume and power of the heating furnace to ensure that the gas flow rate is within a reasonable range.

[0037] In some embodiments, the diameter of the through holes in each row gradually increases from the arc plasma torch 1 to the gas outlet. In the specific implementation of the present embodiment, the working gas enters the furnace inner cylinder 5 from the side close to the gas inlet 2, and the gas flow pressure is high on the side close to the gas inlet 2 and low on the side close to the gas outlet 7. By gradually increasing the diameter of the through holes in each row, the gas inlet amount of each through hole can be ensured to be the same, and the working gas can be uniformly introduced into the furnace inner cylinder through each through hole.

[0038] In some embodiments, the end of the furnace inner cylinder 5 away from the gas outlet 7 is provided with a first mounting plate 3, and at least one arc plasma torch 1 is arranged on the first mounting plate 3. Different numbers of arc plasma torches 1 can be arranged on the first mounting plate 3 according to the required power of the heating furnace, and the power, outlet gas temperature, and flow rate of the plasma gas heating furnace can be adjusted in real time by adjusting the power output of the arc plasma torch 1 and the working gas inlet amount.

[0039] In some embodiments, the heating furnace further comprises an adjusting cylinder 10, which is movably sleeved on the furnace inner cylinder 5 and adjusts the diameter of the through holes by sliding on the outer wall of the furnace inner cylinder 5.

[0040] In some embodiments, the arc plasma torch 1 is provided with an isolation unit 8, which is arranged at the connection between the arc plasma torch 1 and the first mounting plate 3, so as to realize quick sealing between the arc plasma torch and the first mounting plate during online dismounting or mounting. The isolation unit 8 can meet the requirement of online dismounting or mounting of a single arc plasma torch 1 without stopping the furnace. When online replacement is required, the single arc plasma torch 1 is replaced online through the isolation unit 8, and other arc plasma torches work normally, so as to ensure that the temperature in the inner cylinder 5 of the furnace body is in a normal state, prevent the backflow of the gas in the heating furnace caused by the stop of all arc plasma torches, and re-start the arc plasma torch 1 through the isolation unit 8 after the maintenance is completed.

[0041] In some embodiments, the power of the arc plasma torch 1 is 100KW-10MW.

[0042] Please refer to Figure 2 .

[0043] In some embodiments, the furnace body outer cylinder 4 is provided with a second mounting plate 9 at one end corresponding to the first mounting plate 3, the gas inlet assembly comprises a gas inlet 2, one end of the gas inlet 2 is connected to the second mounting plate 9, and the other end of the gas inlet 2 is connected to the gas source of the working gas. In the specific implementation process of the embodiment, four gas inlets 2 are arranged, which are distributed in a ring around the arc plasma torch 1, and the working gas is introduced from different positions to ensure that the working gas enters the furnace body inner cylinder from different angles and is fully mixed with the high-temperature plasma jet.

[0044] In some embodiments, the working gas can be one of nitrogen, carbon dioxide and inert gas or mixed gas, and the temperature of the working gas is 0-500℃.

[0045] In some embodiments, the furnace body inner cylinder 5 is a cylinder in the low-temperature gas heating section, and the furnace body outer cylinder 4 is a cone, the diameter of the cone gradually decreases from the gas inlet assembly to the gas outlet, and the taper angle of the furnace body outer cylinder 4 is 0-60°. The working gas enters the furnace body inner cylinder 5 through the taper surface of the furnace body outer cylinder 4, so as to ensure that the working gas is uniformly distributed through the furnace body inner cylinder 5.

[0046] In some embodiments, at least one temperature sensing unit 6 is arranged on the wall of the furnace body inner cylinder 5 at the gas outlet, and the temperature sensing unit 6 is a thermocouple for detecting the temperature of the high-temperature gas. By detecting the temperature of the high-temperature gas through the thermocouple, the power of the arc plasma torch 1 and the amount of working gas can be adjusted to control the outlet temperature and flow of the high-temperature gas, so as to better meet the temperature control requirements of the industrial furnace.

[0047] In some embodiments, the furnace inner cylinder 5 is provided with a metal cylinder lining near one end of the gas outlet 7, which is made of high alumina brick or corundum brick. The metal cylinder lining meets the requirements of high temperature resistance and erosion resistance of the gas outlet 7.

[0048] In some embodiments, the furnace outer cylinder 4 is provided with an insulation layer, which reduces heat loss in the furnace outer cylinder 4 and improves the thermal efficiency of the plasma gas heating furnace.

[0049] In some embodiments, the furnace outer cylinder 4 is made of one of carbon steel, low alloy steel or high alloy steel. The specific material of the furnace outer cylinder 4 is determined by the heating temperature required by the heating furnace.

[0050] In some embodiments, the furnace inner cylinder 5 is provided with a lining layer made of a high-temperature resistant material or a composite of multiple high-temperature resistant materials. The lining layer meets the requirements of high temperature resistance and erosion resistance of the furnace inner cylinder 5.

[0051] In some embodiments, the gas outlet 7 is provided with a metal cylinder lining, which is made of high alumina brick or corundum brick. The metal cylinder lining meets the requirements of high temperature resistance and erosion resistance of the gas outlet 7.

[0052] Please refer to Figures 4-7 ;

[0053] Figure 4 The installation schematic diagram of the electric arc plasma torch 1 provided on the first mounting plate 3 in this embodiment is shown in the following figure, Figure 5 The installation schematic diagram of the electric arc plasma torch 1 provided on the first mounting plate 3 in this embodiment is shown in the following figure, Figure 6 The installation schematic diagram of the electric arc plasma torch 1 provided on the first mounting plate 3 in this embodiment is shown in the following figure, Figure 7 The installation schematic diagram of the electric arc plasma torch 1 provided on the first mounting plate 3 in this embodiment is shown in the following figure. According to the required power of the heating furnace, different numbers of electric arc plasma torches 1 are provided on the first mounting plate 3 to control the heating temperature of the heating furnace.

[0054] From the above technical solutions, the present application has at least the following advantages and positive effects:

[0055] The application discloses a plasma gas heating furnace, which realizes the replacement of high-temperature flue gas generated by combustion of fossil fuels by high-temperature inert gas heated by electric energy, provides a heat source for an industrial furnace, and realizes almost zero carbon dioxide emission in the whole heating process; meanwhile, the working gas is introduced into the inner cylinder of the furnace body, so that the temperature of the inner cylinder of the furnace body is reduced through heat conduction, a flowing working gas film layer is formed on the wall of the inner cylinder of the furnace body, the inner cylinder of the furnace body is prevented from being scoured by the high-temperature plasma jet, the service life and safety of the equipment are improved, and the working gas is introduced into the inner cylinder of the furnace body in a grading mode, so that the mixing distance of the cold and hot gases is shortened and the uniformity of the outlet gas temperature is ensured.

[0056] The application discloses a plasma gas heating furnace, which realizes the replacement of high-temperature flue gas generated by combustion of fossil fuels by high-temperature inert gas heated by electric energy, provides a heat source for an industrial furnace, and realizes almost zero carbon dioxide emission in the whole heating process; meanwhile, the working gas is introduced into the inner cylinder of the furnace body, so that the temperature of the inner cylinder of the furnace body is reduced through heat conduction, a flowing working gas film layer is formed on the wall of the inner cylinder of the furnace body, the inner cylinder of the furnace body is prevented from being scoured by the high-temperature plasma jet, the service life and safety of the equipment are improved, and the working gas is introduced into the inner cylinder of the furnace body in a grading mode, so that the mixing distance of the cold and hot gases is shortened and the uniformity of the outlet gas temperature is ensured.

[0057] The application discloses a plasma gas heating furnace, which realizes the replacement of high-temperature flue gas generated by combustion of fossil fuels by high-temperature inert gas heated by electric energy, provides a heat source for an industrial furnace, and realizes almost zero carbon dioxide emission in the whole heating process; meanwhile, the working gas is introduced into the inner cylinder of the furnace body, so that the temperature of the inner cylinder of the furnace body is reduced through heat conduction, a flowing working gas film layer is formed on the wall of the inner cylinder of the furnace body, the inner cylinder of the furnace body is prevented from being scoured by the high-temperature plasma jet, the service life and safety of the equipment are improved, and the working gas is introduced into the inner cylinder of the furnace body in a grading mode, so that the mixing distance of the cold and hot gases is shortened and the uniformity of the outlet gas temperature is ensured.

Claims

1. A plasma gas heating furnace characterized by, The heating furnace is of an inner-outer sleeve structure, and the plasma gas heating furnace comprises: a furnace body inner sleeve, which is a plasma gas passage and is provided with a gas outlet; a furnace body outer sleeve, which is a working gas passage and is sleeved outside the furnace body inner sleeve and is in communication with the furnace body inner sleeve; an arc plasma torch, which is arranged at one end of the furnace body inner sleeve away from the gas outlet; an air inlet assembly, which is arranged in communication with the furnace body outer sleeve and is used for introducing working gas into the furnace body outer sleeve.

2. The plasma gas heating furnace according to claim 1, wherein The furnace body inner sleeve is provided with a plurality of rows of through holes which are arranged in a staggered manner and are in communication with the furnace body outer sleeve.

3. The plasma gas heating furnace according to claim 2, wherein The hole diameter of each row of through holes gradually increases in the direction from the arc plasma torch to the gas outlet.

4. The plasma gas heating furnace of claim 2, wherein, The heating furnace further comprises an adjusting sleeve, which is movably sleeved on the furnace body inner sleeve and is used for adjusting the hole diameter of the through holes by sliding on the outer wall of the furnace body inner sleeve.

5. The plasma gas heating furnace of claim 1, wherein, The one end of the furnace body inner sleeve away from the gas outlet is provided with a first mounting plate, and the first mounting plate is provided with at least one arc plasma torch.

6. The plasma gas heating furnace according to claim 5, wherein The arc plasma torch is provided with an isolation unit, which is used for quick sealing between the first mounting plate when the arc plasma torch is removed or installed online.

7. The plasma gas heating furnace of claim 5, wherein, The one end of the furnace body outer sleeve corresponding to the first mounting plate is provided with a second mounting plate, and the second mounting plate is provided with the air inlet assembly, and the air inlet assembly comprises at least one air inlet.

8. The plasma gas heating furnace of claim 7, wherein, The number of the air inlets is more than three, and the air inlets are uniformly distributed in the circumferential direction around the arc plasma torch.

9. The plasma gas heating furnace of claim 1, wherein, The furnace body inner sleeve is a cylinder in the low-temperature gas heating section, and the furnace body outer sleeve is a cone, and the diameter of the cone gradually decreases in the direction from the air inlet assembly to the gas outlet.

10. The plasma gas heating furnace of claim 1, wherein, The furnace body inner sleeve is provided with at least one temperature sensing unit at the gas outlet.

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