CN211782735U

CN211782735U - Tube furnace

Info

Publication number: CN211782735U
Application number: CN202020163583.0U
Authority: CN
Inventors: 付超; 任志恒; 孔凡磊; 朱凯; 王小艳; 战斗
Original assignee: Songshan Lake Materials Laboratory
Current assignee: Songshan Lake Materials Laboratory
Priority date: 2020-02-12
Filing date: 2020-02-12
Publication date: 2020-10-27
Anticipated expiration: 2030-02-12

Abstract

The application provides a tube furnace belongs to gas heating furnace technical field. The tube furnace comprises a furnace body, a radiation furnace tube and a porous medium burner. The furnace body is internally provided with a radiation chamber, and the radiation furnace tube is arranged in the radiation chamber. Porous medium combustor includes shell and perforated plate, has the reaction zone of keeping away from the air inlet in the shell, and the perforated plate is connected and the perforated plate sets up in the reaction zone with the shell, and the shell is connected in the furnace body, and the radiant chamber is configured into the flue gas that can let in perforated plate department burning production. The porous medium burner is arranged in the tubular furnace to heat the fluid in the radiation furnace tube, so that the fluid can be heated more uniformly, the defects of overheating burning loss, high-temperature coking, high-temperature ablation and the like of the radiation furnace tube are avoided, and the emission of NOx is reduced.

Description

Tube furnace

Technical Field

The application relates to the technical field of gas heating furnaces, in particular to a tube furnace.

Background

The tube furnace is the main heating equipment of oil refining and chemical equipment, and is also the energy consumption great household of the oil refining and chemical equipment. The fuel consumption accounts for a considerable proportion of the total energy consumption of oil refinery and chemical plants, with the fuel consumption of refinery tube furnaces accounting for around 40% of the total plant energy consumption.

In a tube furnace, the existing heating technologies are mostly free flame flue gas radiation, convection heating technology and furnace wall radiation heating technology formed by wall-attached flame. The free flame heating burner can only be arranged on the bottom plate of the furnace body, and the problem of uneven temperature exists after heating, so that the phenomena of high-temperature coking of the furnace tube, burning out of the furnace tube and the like are caused.

Taking a bottom-burning type tube furnace as an example, the temperature difference between the furnace top and the furnace bottom is large, so that the vertical material tube in the furnace has uneven upper and lower temperature, the utilization rate of the whole tube is not high (the upper temperature cannot meet the process requirement, the production efficiency is affected), and 1/3 of the whole tube is not effectively utilized. And the NOx in the tail gas is seriously out of standard and far higher than the requirement of 100mg/m in the industry³。

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tubular furnace adopts porous medium combustor as tubular furnace's combustor, can realize even heating to reduce NOx's emission.

In a first aspect, embodiments of the present application provide a tube furnace, which includes a furnace body, a radiant furnace tube, and a porous medium burner. The furnace body is internally provided with a radiation chamber, and the radiation furnace tube is arranged in the radiation chamber. Porous medium combustor includes shell and perforated plate, has the reaction zone of keeping away from the air inlet in the shell, and the perforated plate is connected and the perforated plate sets up in the reaction zone with the shell, and the shell is connected in the furnace body, and the radiant chamber is configured into the flue gas that can let in perforated plate department burning production.

After the mixed gas (fuel gas and air) is introduced into the porous medium burner, the mixed gas is burnt at the porous plate in the reaction zone, when the mixed gas is burnt, the flame is limited in countless pores of the porous plate, free flame is not generated, local high temperature is not generated, the emission of NOx is reduced, the generated heat is uniformly distributed, and the heat can be uniformly subjected to heat exchange with the fluid in the radiation furnace tube; meanwhile, free flame is not generated, so that the problems of local overheating burning loss, high-temperature coking, high-temperature ablation and the like of the radiation furnace tube can be avoided, and the production cost of the tube furnace can be saved.

In one possible embodiment, the radiant face of the perforated plate is parallel to the axis of the radiant furnace tube.

The radiation surface of the porous plate is parallel to the plane formed by the porous plate, the temperature of the porous plate is basically consistent at each position of the same radiation surface, and the axis of the radiation furnace tube is parallel to the radiation surface, so that the distance between the radiation surface and the radiation furnace tube is basically consistent, the radiation temperature of the fluid in the same radiation furnace tube for heat exchange is basically consistent when the temperature radiated by the radiation surface is subjected to heat exchange with the fluid in the radiation furnace tube, and the fluid can be uniformly heated.

In one possible embodiment, at least a portion of the walls of the irradiation chamber are perforated plates.

The heat generated at the perforated plate can be radiated directly into the radiant chamber to heat the radiant tubes within the radiant chamber. If the burner is a free flame burner, free flame cannot directly enter the radiation chamber (if the burner directly enters, the problems of local overheating burning loss, high-temperature coking, high-temperature ablation and the like caused by uneven heating of the radiation furnace tube can be caused), so the volume of the tube furnace can be reduced by using the porous medium burner, heat generated at the porous plate can directly enter the radiation chamber for heating, and the heat utilization rate is improved.

In a possible implementation mode, the perforated plate is cylindrical, the radiation furnace tube comprises a plurality of radiation tubes which are sequentially communicated end to end, each radiation tube is vertically arranged, the plurality of radiation tubes are arranged along the circumferential direction of the cylindrical perforated plate, and the radiation tubes are located on the outer side of the cylindrical perforated plate.

Can all vertically arrange the radiant tube in the circumference of cylindric perforated plate to can arrange more radiant tubes, can give more fluid heating, improve heating efficiency.

In one possible embodiment, the porous medium burner comprises a first porous medium burner and a plurality of second porous medium burners, the perforated plate of the first porous medium burner being cylindrical and the perforated plates of the plurality of second porous medium burners being flat, the flat perforated plates being located outside the plurality of radiant tubes, such that the plurality of radiant tubes are located between the cylindrical perforated plates and the flat perforated plates.

The porous medium burner has various porous plate shapes, so that the cylindrical porous plate may be set inside the furnace tube and the planar porous plate may be set outside the furnace tube for double-sided radiation of the radiation furnace tube and high heating efficiency.

In one possible embodiment, the radiant furnace tube is vertically arranged, the shell is connected to the side wall of the radiant chamber, and the air inlet direction of the porous medium burner is transversely arranged.

The porous medium burner can be installed on the side wall of the furnace body forming the radiation chamber, and then the radiation furnace tube which is vertically arranged is heated by the heat radiated at the porous plate. The fluid in the length direction in the radiation furnace tube can be heated, and the heating effect is better.

In a possible embodiment, the porous medium burner comprises a plurality of porous medium burners, the porous plate of each porous medium burner is flat, the radiation chamber is positioned in the middle of the furnace body, the porous plate is positioned outside the radiation chamber and is in direct contact with the cavity in the radiation chamber.

A plurality of porous medium burners can be arranged and heated, and the heating efficiency is higher.

In a possible embodiment, the porous medium burner comprises a plurality of porous medium burners, the porous plate of each porous medium burner is flat, the furnace body is also provided with an air inlet chamber, the radiation chamber is positioned at the periphery of the air inlet chamber, the porous medium burners are positioned between the radiation chamber and the air inlet chamber, the air inlet is communicated with the air inlet chamber, and the porous plates are in direct contact with the cavity in the radiation chamber.

The same air inlet chamber is used for air inlet, the radiation furnace tubes in the radiation chambers are heated through the porous medium burners, the heating efficiency is higher, and the porous medium burners are convenient to burn.

In a possible implementation mode, the perforated plate is in a flat plate shape, the shell of the porous medium burner is connected to the bottom of the furnace body, a radiation cylinder is arranged in the radiation chamber, two ends of the radiation cylinder are of an opening structure, the perforated plate is arranged at the lower end opening of the radiation cylinder, and the upper end opening of the radiation cylinder is communicated with the radiation chamber.

The heat generated at the perforated plate is radiated into the radiation cylinder, and then the radiation cylinder is uniformly heated and then is radiated into the radiation chamber, and the radiation furnace tube in the radiation chamber is heated. Wherein, the radiation furnace tube can be arranged in the circumferential direction of the radiation cylinder, more radiation furnace tubes can be heated, and the heating efficiency is improved.

In one possible embodiment, the radiant furnace tubes are corrugated tubes.

When setting the radiation furnace tube into the wave form pipe, owing to use the porous medium combustor to heat, the wave form furnace tube is heated more evenly, and fluid when flowing in the wave form furnace tube, can flow along the curve, and it has certain fluctuation inside, can have certain mixed effect to make fluidic inside also can heat better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.

FIG. 1 is a cross-sectional view of a tube furnace according to one embodiment of the present application;

FIG. 2 is a cross-sectional view of a porous media burner provided in accordance with an embodiment of the present disclosure;

FIG. 3 is a sectional view of a tube furnace according to the second embodiment of the present application;

FIG. 4 is a sectional view of a tube furnace according to a third embodiment of the present application;

FIG. 5 is a sectional view of a porous medium burner provided in accordance with a third embodiment of the present application;

FIG. 6 is a sectional view of a tube furnace according to a fourth embodiment of the present invention;

FIG. 7 is a sectional view of a tube furnace according to a fifth embodiment of the present invention;

fig. 8 is a combined cross-sectional view of a porous medium burner and a radiation cylinder according to a fifth embodiment of the present application.

Icon: 110-a furnace body; 120-furnace tube; 130-a porous medium burner; 111-a radiation chamber; 112-convection chamber; 121-radiation furnace tube; 122-convection furnace tube; 123-a fluid inlet; 124-a fluid outlet; 131-a housing; 132-a multi-well plate; 133-a flashback-preventing disc; 134-uniformly distributing disks; 135-an air inlet; 1321 — a first orifice plate; 1322-a second orifice plate; 136-a gas guiding disk; 210-an inlet chamber; 410-a first porous medium burner; 420-a second porous medium burner; 510-radiation cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In the prior art, the tubular furnace mainly uses free flame to heat fluid in the furnace tube, a distance needs to be reserved between the furnace tube and the burner, uneven heating of the furnace tube caused by direct contact of the free flame and the furnace tube is avoided, and the volume of the tubular furnace is large. And because the free flame heats, flame is upwards, and the free flame combustor can only be set up at the stove bottom of tubular furnace, and the mounted position of combustor is comparatively single. And the temperature of the free flame is uneven, the heating of the fluid in the furnace tube is also uneven, and the heating effect is not good.

Therefore, in the present application, the inventors have made an improvement to a burner using a porous medium burner as a heater in a tube furnace.

Example one

Fig. 1 is a cross-sectional view of a tube furnace provided in this embodiment, and referring to fig. 1, in this embodiment, the tube furnace includes a furnace body 110, a furnace tube 120, and a porous medium burner 130. The furnace body 110 has a radiation chamber 111 and a convection chamber 112 therein, the furnace tube 120 includes a radiation furnace tube 121 and a convection furnace tube 122, the radiation furnace tube 121 is communicated with the convection furnace tube 122, the radiation furnace tube 121 is disposed in the radiation chamber 111, and the convection furnace tube 122 is disposed in the convection chamber 112.

The furnace body 110 is assembled by a heat-resistant metal material member and a fire-resistant heat-insulating material member, the heat-resistant metal material (for example, a heat-resistant alloy steel structure) is formed into a rigid structure to form a shell, and then a fire-resistant heat-insulating layer (made of a fire-resistant heat-insulating material, for example, a commercially available fire-resistant heat-insulating fiber product — fire-resistant heat-insulating cotton) is disposed inside the shell to form the furnace body 110.

The furnace tube 120 is provided with a fluid inlet 123 and a fluid outlet 124, the fluid inlet 123 is located at one end of the radiant furnace tube 121 far away from the convection furnace tube 122, and the fluid outlet 124 is located at one end of the convection furnace tube 122 far away from the radiant furnace tube 121. Fluid enters the furnace tubes 120 through the fluid inlet 123, passes through the radiant and

convection chambers

111, 112 for heating, and exits the furnace tubes 120 through the fluid outlet 124.

In this embodiment, the radiation chamber 111 and the convection chamber 112 are both located inside the furnace body 110, the convection chamber 112 is located above the radiation chamber 111, the convection chamber 112 is directly communicated with the radiation chamber 111, and the lower portion of the radiation chamber 111 is sealed. Further, a high-temperature-resistant sealant (commercially available high-temperature-resistant sealant) is arranged on the fireproof heat-insulating layer, and the lower end of the furnace tube 120 penetrates through the bottom wall of the furnace body 110, then enters the radiation chamber 111, and then enters the convection chamber 112. The furnace tube 120 and the bottom wall of the furnace body 110 are sealed by the high temperature resistant sealant, so as to avoid heat dissipation.

In this embodiment, a plurality of hole structures are disposed on the sidewall of the radiation chamber 111 in the furnace body 110, and the hole structures are directly communicated with the radiation chamber 111. One porous medium burner 130 is disposed on each cell structure. Fig. 2 is a sectional view of the porous medium burner 130 provided in the present embodiment. Referring to fig. 1 and 2, each porous medium burner 130 includes a housing 131, a porous plate 132, an anti-backfire disk 133 and a distributor disk 134. The outer shell 131 is connected to the furnace body 110, the outer shell 131 is installed in the hole structure of the furnace body 110, the outer shell 131 and the furnace body 110 are bonded by a high temperature resistant sealant, or further connected by a fastener (for example, a bolt or a flange) on the basis of the high temperature resistant sealant. After the housing 131 is installed on the furnace body 110, the flue gas generated by the combustion at the porous plate 132 can enter the radiation chamber 111.

The structure of the housing 131 may be a revolving body, a square, an oval, etc., and the embodiment of the present application is not limited. The outer shell 131 may substantially conform to the shape of the wall of the hole structure provided in the furnace body 110, so as to connect the outer shell 131 and the furnace body 110 in a sealing manner by the aforementioned high temperature-resistant sealant.

Further, the porous plate 132, the anti-backfire disc 133 and the uniform distribution disc 134 are all plate-shaped structures and are arranged layer by layer, and a gap is formed between every two adjacent plate-shaped structures and is connected with the inner wall of the shell 131. The shapes of the perforated plate 132, the anti-backfire disc 133 and the equispaced disc 134 are also changed according to the structural change of the outer shell 131 (according to the shape change of the hole structure provided on the furnace body 110) so that the perforated plate 132, the anti-backfire disc 133 and the equispaced disc 134 are installed in the outer shell 131.

One end of shell 131 is provided with air inlet 135, follows the direction of admitting air, has set gradually in shell 131 and has thoughtlessly distinguished, fire prevention district and reaction zone in advance, and the perforated plate 132 sets up in the reaction zone, and fire prevention dish 133 sets up in fire prevention district, and equipartition dish 134 sets up in thoughtlessly distinguishing in advance.

The premixed gas entering from the gas inlet 135 can be uniformly distributed in the premixing area after passing through the uniform distribution disc 134, so that the subsequent gas can be uniformly combusted. The premixed gas is combusted in the reaction zone, the porous plate 132 is positioned in the reaction zone, and the premixed gas is combusted at the holes of the porous plate 132, so that the combustion in the reaction zone is more uniform, the flame is limited in countless pores of the porous plate 132, free flame is not generated, local high temperature is avoided, and the emission of NOx is reduced; meanwhile, because free flame is not generated, adverse effects such as overheating burning loss, high-temperature coking, high-temperature ablation and the like on the radiation furnace tube 121 in the radiation chamber 111 can be avoided.

Optionally, the porous plate 132 includes a first porous plate 1321 and a second porous plate 1322, the first porous plate 1321 and the second porous plate 1322 are both located in the reaction region, the first porous plate 1321 and the second porous plate 1322 are attached, the first porous plate 1321 and the second porous plate 1322 are both connected to the housing 131, an aperture of the first porous plate 1321 is smaller than an aperture of the second porous plate 1322, the second porous plate 1322 is close to the radiation chamber 111, and the first porous plate 1321 is far from the radiation chamber 111. The larger pore size of the second orifice plate 1322 allows for more intense combustion and more heat generation, and its proximity to the radiant chamber 111 allows for more heat generated by the combustion of the porous media burner 130 to be radiated into the radiant chamber 111 to heat the fluid.

The first orifice 1321 and the second orifice 1322 may have a structure including, but not limited to, a foam, a honeycomb, an array, a filament winding, and the like. The first orifice plate 1321 has a small aperture, and the second orifice plate 1322 has a large aperture. The second orifice plate 1322 is close to the radiation chamber 111, the first orifice plate 1321 is close to the anti-tempering area, and after gas passes through the first orifice plate 1321, the gas is combusted at the second orifice plate 1322 with a larger aperture, so that the combustion is more sufficient, flame after the combustion is not easy to pass through the first orifice plate 1321 with a smaller aperture, so that a certain anti-tempering effect is achieved, most of the combustion is performed in the second orifice plate 1322, and a small part of the combustion is performed in the first orifice plate 1321, so that the combustion is more sufficient.

Optionally, the apertures of the small holes in the first orifice plate 1321 are 0.2mm to 3mm, for example: the apertures of the holes in the first orifice plate 1321 are 0.2mm, 0.5mm, 1mm, 2mm, or 3 mm. The pore size of the large pores in the second orifice plate 1322 is 3mm to 7mm, for example: the apertures of the holes in the second orifice plate 1322 are 3mm, 4mm, 5mm, 6mm, or 7 mm. The first orifice plate 1321 and the second orifice plate 1322 have a porosity of 10% to 80%, for example: the first orifice plate 1321 and the second orifice plate 1322 have a porosity of 10%, 30%, 50%, 70%, or 80%. The combustion at the second orifice plate 1322 can be made more uniform, and the temperature of the heat at the radiant location thereof can be made more uniform, so as to uniformly heat the fluid in the radiant burner tube 121.

Further, the material of the first orifice 1321 and the second orifice 1322 includes, but is not limited to, alumina ceramic, zirconia ceramic, silicon carbide ceramic, iron-chromium-aluminum alloy, chromium-nickel alloy, tungsten alloy, and other high temperature resistant materials.

In this embodiment, the anti-backfire disc 133 can further reduce the backfire rate of the flame in the porous medium burner 130, and through the arrangement of the anti-backfire disc 133, the flame can be effectively prevented from entering the premixing area, the combustion of the gas entering from the gas inlet 135 in the premixing area is avoided, and the use safety of the tube furnace is improved.

Alternatively, the housing 131 is a cylinder-like structure, and the lower end of the housing 131 gradually shrinks to form the air inlet 135 with a smaller diameter. The smaller diameter of the inlet 135 may cause the premixed gas to be unevenly distributed in the premixing area when the premixed gas is introduced into the premixing area of the chamber, so that the gas may not be evenly combusted in the subsequent stage. Therefore, a gas guide plate 136 is provided at the gas inlet 135.

The gas guide plate 136 is spaced apart from the housing, and the gas guide plate 136 is connected to the housing 131 by a plurality of connectors, so that the premixed gas can be introduced into the premixing zone from the periphery of the gas guide plate 136 (between the gaps between the gas guide plate 136 and the housing 131) after the premixed gas is introduced from the gas inlet 135, and the portion of the premixing zone adjacent to the housing 131 can be filled with the premixed gas.

In this embodiment, in order to burn the premixed gas in the reaction zone, an ignition electrode, a temperature measuring electrode, and a flame detecting electrode (not shown) are disposed in the reaction zone. The ignition electrode is used for burning the fuel gas in the reaction zone, the temperature measuring electrode is used for detecting the temperature in the reaction zone, and the flame detecting electrode is used for detecting whether the burning in the reaction zone is carried out or not.

In this embodiment, the radiant surfaces of the perforated plates 132 of the porous medium burner 130 are parallel to the axis of the radiant burner tube 121 (parallel means substantially parallel, and not perfectly parallel). The radiation surface of the porous plate 132 is substantially parallel to the plane on which the porous plate 132 is located, and the corresponding radiation temperature gradually decreases as the distance from the porous plate 132 increases; but the temperature is substantially equal everywhere on the radiant face at the same distance from the perforated plate 132 so that the radiant temperature is substantially uniform in the axial direction of the radiant furnace tubes 121. For example: the temperature of the radiation surface at a distance of 10cm from the perforated plate 132 coincides with the temperature of the radiation surface at a distance of 12cm from the perforated plate 132, and the temperature of the radiation surface at a distance of 14cm from the perforated plate 132, but the temperature of the radiation surface at a distance of 10cm from the perforated plate 132, the temperature of the radiation surface at a distance of 12cm from the perforated plate 132, and the temperature of the radiation surface at a distance of 14cm from the perforated plate 132 gradually decrease.

At each position of the same radiation surface with the same distance from the porous plate 132, the temperatures are substantially the same, and the axes of the radiation furnace tubes 121 are substantially parallel to the radiation surface, so that when the temperature radiated from the radiation surface exchanges heat with the fluid in the radiation furnace tubes 121, the radiation temperature of the fluid in the same radiation furnace tube 121 for exchanging heat is substantially the same, and the fluid can be uniformly heated.

However, for a perforated plate 132, the temperature of the radiation surface decreases with increasing distance. Therefore, optionally, the porous medium burner 130 comprises a plurality of porous medium burners 130, and the number of the porous medium burners 130 may be a plurality, for example: four, six, eight and the like, and the plurality of porous medium burners 130 are symmetrically arranged along the axis of the tube furnace, so that the radiation temperature at the radial position of the radiation furnace tube 121 can tend to be consistent. The porous plates 132 of each porous medium burner 130 are flat, the radiation chamber 111 is located in the middle of the furnace body 110, the porous plates 132 are located outside the radiation chamber 111, and the porous plates 132 are in direct contact with the cavity in the radiation chamber 111.

With reference to fig. 1, four porous medium burners 130 are illustrated as an example. Among them, four porous medium burners 130 are respectively disposed at both sides of the radiation chamber 111, for example: two porous medium burners 130 are disposed on the left side of the radiation chamber 111, two porous medium burners 130 are disposed on the right side of the radiation chamber 111, the two porous medium burners 130 on the left side are disposed one above the other, and the two porous medium burners 130 on the right side are also disposed one above the other.

The installation position of the porous medium burner 130 provided by the embodiment of the application is more random, and the porous medium burner is not required to be only arranged at the bottom of the furnace body 110. Four porous medium burners 130 are installed around the radiant coils 121 to better heat the fluid in the radiant coils 121.

Further, the porous medium burner 130 is installed on the furnace body 110, the pore structure is located on the side wall of the furnace body 110, the shell 131 is connected to the side wall of the furnace body 110, the radiation furnace tube 121 is vertically arranged, the axis of the pore structure is transversely arranged, and the air inlet direction of the porous medium burner 130 is transversely arranged. So that the flat plate-shaped porous plate 132 can uniformly heat the fluid in the radiant furnace tube 121.

Further, at least a portion of the chamber wall of the radiation chamber 111 is a porous plate 132. That is, at least a portion of the wall of the radiant chamber 111 is the second orifice plate 1322, and heat generated by combustion at the first orifice plate 1321 and the second orifice plate 1322 can directly enter the radiant chamber 111 and heat the radiant coils 121 within the radiant chamber 111. In the case of the free flame burner, the free flame cannot directly enter the radiation chamber 111 (if the free flame burner directly enters, the local heating of the radiation furnace tube 121 may be caused), so the use of the porous medium burner 130 can reduce the volume of the tube furnace, and the heat generated at the porous plate 132 can directly enter the radiation chamber 111 for heating, thereby improving the heat utilization rate.

In this embodiment, the radiation furnace tube 121 may be a corrugated tube, and the furnace tube 120 may be a corrugated tube, because the fluid in the radiation furnace tube 121 is heated by the porous medium burner 130, and the fluid in the radiation furnace tube 121 does not need to be heated by the free flame, so the waveform furnace tube is heated more uniformly during heating, and the fluid flows along a curve when flowing in the waveform furnace tube, and the fluid has certain fluctuation inside, and can have a certain mixing effect, so that the inside of the fluid can be heated better.

In other embodiments, the radiation furnace tube 121 may also be a straight tube, and the furnace tube 120 may also be a straight tube, which is not limited in this embodiment.

In this embodiment, the number of the radiation furnace tubes 121 may be one, one radiation furnace tube 121 is vertically disposed in the radiation chamber 111, the upper end of the radiation furnace tube 121 is communicated with the convection furnace tube 122, and the lower end passes through the bottom of the furnace body 110 and is disposed with a fluid inlet 123 for the fluid to enter.

In other embodiments, the radiant furnace tube 121 includes a plurality of radiant tubes sequentially connected end to end, each radiant tube is vertically disposed, the middle portions of the plurality of radiant tubes are substantially parallel, and the end portions of the plurality of radiant tubes are connected end to end and are communicated so as to heat more fluids.

In this embodiment, the convection furnace tube 122 is also vertically disposed, and after the heat generated at the second orifice plate 1322 enters the radiation chamber 111, the fluid in the radiation furnace tube 121 is heated first, and then enters the convection chamber 112, the fluid in the convection furnace tube 122 is further heated, so as to increase the utilization rate of the heat.

The working principle of the tube furnace provided by the embodiment is as follows:

fluid enters the furnace tubes 120 through the fluid inlet 123, then passes through the radiant and

convection chambers

111, 112 in sequence, and exits through the fluid outlet 124. Firstly, gas and air are introduced into the premixing area from the air inlet 135 of the shell 131 to be mixed, then the gas and the air sequentially pass through the anti-tempering area and the reaction area, the ignition electrode connected to the reaction area is ignited, whether flame is generated in the reaction area is detected through the flame detection electrode, and the temperature in the reaction area is detected through the temperature measurement electrode. The mixed gas is largely combusted at the second orifice plate 1322 of the reaction zone to generate a large amount of heat and a small amount of flue gas, and the large amount of heat is radiated into the radiation zone to heat the fluid in the radiation furnace tube 121; the remaining heat and a small amount of flue gas then enter the convection chamber 112, further heating the fluid in the convection coil 122, a small amount of flue gas exits above the convection chamber 112, and the heated fluid exits at the fluid outlet 124 for utilization.

When the fluid in the radiant tube is heated, since a part of the wall of the radiant chamber 111 is the second orifice plate 1322, the heat generated at the second orifice plate 1322 can directly enter the radiant chamber 111 to heat the fluid in the radiant tube 121. Because the second orifice 1322 is parallel to the axis of the radiant furnace tube 121, the fluid in the radiant furnace tube 121 can be heated more uniformly.

Example two

The embodiment also provides a tube furnace, and the embodiment is an improvement on the first embodiment, and the technical scheme described in the first embodiment is also applicable to the first embodiment. The technical solution disclosed in the first embodiment is not described again, and the difference between the first embodiment and the second embodiment is: the installation position of the porous medium burner 130 and the arrangement position of the radiation chamber 111 are different.

Fig. 3 is a sectional view of the tube furnace provided in this embodiment. Referring to fig. 3, in the present embodiment, the furnace body 110 further includes an air inlet chamber 210, the radiation chamber 111 is located at the periphery of the air inlet chamber 210, and the porous plate 132 is located between the radiation chamber 111 and the air inlet chamber 210 to communicate the air inlet 135 with the air inlet chamber 210. The air inlet chamber 210 is of a column-shaped structure, the radiation chamber 111 is of an annular structure, the radiation chamber 111 is positioned outside the air inlet chamber 210, and a plurality of hole structures are arranged on the furnace body 110 between the radiation chamber 111 and the air inlet chamber 210 and used for installing the porous medium burner 130, so that the porous medium burner 130 is positioned between the radiation chamber 111 and the air inlet chamber 210.

The radiant furnace tube 121 comprises a plurality of radiant tubes which are sequentially communicated end to end, each radiant tube is vertically arranged, the middle parts of the plurality of radiant tubes are basically parallel, and the end parts of the plurality of radiant tubes are connected end to end and communicated so as to heat more fluids. The plurality of radiant tubes are arranged in the radiant chamber 111 to form a substantially ring-shaped structure, and the plurality of radiant tubes are arranged in a manner consistent with the shape of the radiant chamber 111.

In this embodiment, the porous medium burner 130 includes a plurality of porous medium burners 130, and the number of the porous medium burners 130 may be a plurality, for example: four, six, eight, etc. The perforated plates 132 of each porous medium burner 130 are flat plates, and with continued reference to fig. 3, the following description will be made by taking four porous medium burners 130 as an example. Wherein, four porous medium burners 130 are respectively arranged on both sides of the intake chamber 210, for example: two porous medium burners 130 are arranged on the left side of the intake chamber 210, two porous medium burners 130 are arranged on the right side of the intake chamber 210, the two porous medium burners 130 on the left side are arranged one above the other, and the two porous medium burners 130 on the right side are also arranged one above the other. And the second orifice plate 1322 of each porous medium burner 130 is a part of the radiant chamber 111, and the four porous medium burners 130 are installed around the radiant furnace tubes 121, so that the fluid in the radiant furnace tubes 121 can be better heated.

In this embodiment, the convection chamber 112 is communicated with the radiation chamber 111, the convection chamber 112 is in a column structure, the lower end of the convection chamber 112 is communicated with the annular radiation chamber 111, and the convection furnace tubes 122 in the convection chamber 112 are transversely arranged, so that more fluids in the convection furnace tubes 122 can be heated, the heating time of the fluids can be prolonged, and the heating effect of the fluids can be better.

EXAMPLE III

The embodiment also provides a tube furnace, and the embodiment is an improvement on the first embodiment, and the technical scheme described in the first embodiment is also applicable to the first embodiment. The technical solution disclosed in the first embodiment is not described again, and the difference between the first embodiment and the second embodiment is: the porous medium burner 130 is different in structure and installation position.

Fig. 4 is a sectional view of the tube furnace provided in this embodiment, and fig. 5 is a sectional view of the porous medium burner 130 provided in this embodiment. Referring to fig. 4 and 5, in the present embodiment, the porous medium burner 130 includes a porous plate 132 and a housing 131, the porous plate 132 is cylindrical, that is, the porous medium burner 130 is a hollow structure and is a gas uniform distribution cylinder, and the lower end of the gas uniform distribution cylinder is an open structure for introducing gas and air. The lower extreme of perforated plate 132 is provided with shell 131 (shell 131 sets up the position at the open structure who is close to gaseous uniform distribution section of thick bamboo), and shell 131 is the platelike structure that the middle part was provided with the hole, and the width of shell 131 is greater than the width of perforated plate 132 (the periphery of shell 131 surpasss the periphery of perforated plate 132), and shell 131 extends towards the direction of keeping away from gaseous uniform distribution section of thick bamboo, and shell 131 is connected with furnace body 110, optionally, through flange joint between shell 131 and the furnace body 110, and gaseous uniform distribution section of thick bamboo and external environment intercommunication.

Further, the porous plate 132 includes a first porous plate 1321 and a second porous plate 1322, the aperture of the first porous plate 1321 is smaller than the aperture of the second porous plate 1322, where the aperture of the first porous plate 1321 is substantially the same as the aperture of the first porous plate 1321 in the first embodiment, and the aperture of the second porous plate 1322 is substantially the same as the aperture of the second porous plate 1322 in the first embodiment, which is not described in detail in this embodiment.

The first orifice 1321 is cylindrical, the second orifice 1322 is also cylindrical, the structure of the first orifice 1321 is identical to the structure of the second orifice 1322, the size of the first orifice 1321 is smaller than the size of the second orifice 1322, the first orifice 1321 is positioned inside the second orifice 1322, and there is substantially no gap between the first orifice 1321 and the second orifice 1322.

In this embodiment, the radiation chamber 111 is a column structure, the porous plate 132 is located in the radiation chamber 111, the radiation furnace tube 121 is also located in the radiation chamber 111, the radiation furnace tube 121 includes a plurality of radiation tubes that sequentially communicate end to end, each radiation tube is vertically disposed, the plurality of radiation tubes are arranged along the circumferential direction of the cylindrical porous plate 132 (the plurality of radiation tubes are arranged along the circumferential direction of the cylindrical second porous plate 1322, the inner wall of the radiation chamber 111 is the second porous plate 1322), and are both located outside the cylindrical porous plate 132 (both located outside the cylindrical second porous plate 1322). So that a plurality of radiant tubes can be heated using one porous medium burner 130.

In this embodiment, the convection chamber 112 is communicated with the radiation chamber 111, the convection chamber 112 is of a column structure, the lower end of the convection chamber 112 is communicated with the column-shaped radiation chamber 111, and the convection furnace tubes 122 in the convection chamber 112 are transversely arranged, so that more fluids in the convection furnace tubes 122 can be heated, the heating time of the fluids can be prolonged, and the heating effect of the fluids can be better.

Example four

The embodiment also provides a tube furnace, and the embodiment is an improvement on the basis of the third embodiment, and the technical scheme described in the third embodiment is also applicable to the third embodiment. The technical solutions disclosed in the third embodiment are not described again, and the difference between this embodiment and the third embodiment is that: the heating mode of the radiation furnace tube 121 is double-sided radiation heating.

Fig. 6 is a sectional view of the tube furnace provided in this embodiment. Referring to fig. 2, 5 and 6, the porous medium burner 130 includes a first porous medium burner 410 and a plurality of second porous medium burners 420, the porous plate 132 of the first porous medium burner 410 is cylindrical (the first porous medium burner 410 is the porous medium burner 130 provided in the third embodiment), the porous plates 132 of the plurality of second porous medium burners 420 are flat (the second porous medium burner 420 is the porous medium burner 130 provided in the first embodiment or the second embodiment), and the flat porous plates 132 are located outside the plurality of radiant tubes such that the plurality of radiant tubes are located between the cylindrical porous plate 132 and the flat porous plate 132.

The inner side of the radiation chamber 111 is subjected to radiation heating through the first porous medium burner 410, the outer side of the radiation chamber 111 is subjected to radiation heating through the second porous medium burner 420, double-sided radiation heating is performed on the radiation furnace tube 121, and the heating effect is better.

Optionally, a hole structure is provided on the furnace body 110 of the outer wall of the radiation chamber 111 to perform the installation of the second porous medium burner 420. Further, the second porous medium burner 420 includes a plurality of second porous medium burners 420, and the plurality of second porous medium burners 420 are arranged at intervals around the circumference of the radiation chamber 111 so as to achieve uniform heating of the radiation furnace tubes 121.

EXAMPLE five

The embodiment also provides a tube furnace, and the embodiment is an improvement on the first embodiment, and the technical scheme described in the first embodiment is also applicable to the first embodiment. The technical solution disclosed in the first embodiment is not described again, and the difference between the first embodiment and the second embodiment is: the porous medium burner 130 is installed at a different position.

FIG. 7 is a sectional view of the tube furnace provided in the present embodiment; fig. 8 is a sectional view of the combination of the porous medium burner 130 and the radiation tube 510 according to the present embodiment. Referring to fig. 2, 7 and 8, the porous plate 132 is a flat plate, the housing 131 of the porous medium burner 130 is connected to the bottom of the furnace body 110, the radiation cylinder 510 is disposed in the radiation chamber 111, two ends of the radiation cylinder 510 are open structures, the porous plate 132 is disposed at the lower opening of the radiation cylinder 510, and the upper opening of the radiation cylinder 510 is communicated with the radiation chamber 111.

In this embodiment, the radiation chamber 111 is a column structure, the radiation cylinder 510 is located in the radiation chamber 111, the radiation furnace tube 121 is also located in the radiation chamber 111, the radiation furnace tube 121 includes a plurality of radiation tubes sequentially connected end to end, each radiation tube is vertically disposed, and the plurality of radiation tubes are arranged along the circumferential direction of the radiation cylinder 510 and are located outside the radiation cylinder 510. So that a plurality of radiant tubes can be uniformly heated using one porous medium burner 130.

The heat generated at the porous plate 132 is first radiated into the radiation cylinder 510, and then is uniformly radiated to the radiation furnace tube 121 outside the radiation cylinder 510 through the radiation cylinder 510, so as to heat the fluid in the radiation furnace tube 121.

The application provides a tubular furnace's beneficial effect includes:

(1) the porous medium burner 130 is used as the burner of the tube furnace, the installation position of the porous medium burner 130 is more diversified, and the requirements of various tube furnaces can be met.

(2) The arrangement of the radiation furnace tubes 121 in the radiation chamber 111 is more diversified, and the heating efficiency of the tube furnace can be improved.

(3) The porous plate 132 structure can be used as a part of the wall of the radiation chamber 111, and the heat generated by the porous plate 132 can directly enter the radiation chamber 111 by radiation, thereby improving the heating efficiency of the fluid in the radiation furnace tube 121.

(4) The radiation surface of the porous plate 132 is parallel to the axis of the radiation furnace tube 121, and the heating temperature of the fluid in the same radiation furnace tube 121 is substantially the same, so that the fluid is heated more uniformly.

(5) The free flame burner is not needed for heating, the problems of local overheating burning loss, high-temperature coking, high-temperature ablation and the like of the radiation furnace tube 121 in the fluid heating process can be avoided, and the volume of the tube furnace can be reduced to a certain extent.

(6) The porous medium combustion technology is adopted, so that the combustion temperature is uniform, the temperature of a combustion area is uniformly distributed, the pollutant emission is reduced (the emission of nitrogen oxides and carbon monoxide is ultralow), the energy consumption is reduced, the radiation heat transfer is enhanced, and the treatment efficiency and the treatment capacity of the tubular furnace are improved.

The above description is only a few examples of the present application and is not intended to limit the present application, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tube furnace, comprising:

a furnace body having a radiation chamber therein;

the radiation furnace tube is arranged in the radiation chamber;

porous medium combustor, porous medium combustor includes shell and perforated plate, have the reaction zone of keeping away from the air inlet in the shell, the perforated plate with the shell is connected just the perforated plate set up in the reaction zone, the shell connect in the furnace body, the radiant chamber is configured into and can lets in the flue gas that perforated plate department burning produced.

2. The tube furnace of claim 1 wherein the radiant face of the perforated plate is parallel to the axis of the radiant furnace tube.

3. The tube furnace of claim 2, wherein at least a portion of the chamber wall of the radiant chamber is the perforated plate.

4. The tube furnace of claim 3, wherein the perforated plate is cylindrical, the radiant furnace tube comprises a plurality of radiant tubes sequentially communicated end to end, each radiant tube is vertically arranged, and the radiant tubes are arranged along the circumferential direction of the cylindrical perforated plate and are located outside the cylindrical perforated plate.

5. The tube furnace according to claim 4, wherein the porous medium burner comprises a first porous medium burner and a plurality of second porous medium burners, the perforated plate of the first porous medium burner is cylindrical, the perforated plates of the plurality of second porous medium burners are flat plate-shaped, and the flat plate-shaped perforated plates are positioned outside the plurality of radiant tubes such that the plurality of radiant tubes are positioned between the cylindrical perforated plates and the flat plate-shaped perforated plates.

6. The tube furnace of claim 3, wherein the radiant furnace tube is vertically disposed, the housing is connected to a sidewall of the radiant chamber, and an air intake direction of the porous medium burner is transversely disposed.

7. The tube furnace of claim 6, wherein the porous medium burner comprises a plurality of porous medium burners, the porous plate of each porous medium burner is flat, the radiation chamber is located in the middle of the furnace body, the porous plate is located outside the radiation chamber and is in direct contact with the cavity in the radiation chamber.

8. The tube furnace of claim 6, wherein the porous medium burner comprises a plurality of porous medium burners, the porous plate of each porous medium burner is flat, the furnace body further comprises an air inlet chamber, the radiation chamber is located on the periphery of the air inlet chamber, the porous medium burner is located between the radiation chamber and the air inlet chamber, the air inlet is communicated with the air inlet chamber, and the porous plate is in direct contact with the cavity in the radiation chamber.

9. The tube furnace as claimed in claim 3, wherein the perforated plate is flat, the housing of the porous medium burner is connected to the bottom of the furnace body, a radiation tube is disposed in the radiation chamber, two ends of the radiation tube are open, the perforated plate is disposed at the lower opening of the radiation tube, and the upper opening of the radiation tube is communicated with the radiation chamber.

10. The tube furnace of any of claims 1-9, wherein the radiant furnace tubes are corrugated tubes.