CN112179138A - High-efficiency low NOXCombustion heating furnace discharging porous medium - Google Patents

High-efficiency low NOXCombustion heating furnace discharging porous medium Download PDF

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CN112179138A
CN112179138A CN202011009600.6A CN202011009600A CN112179138A CN 112179138 A CN112179138 A CN 112179138A CN 202011009600 A CN202011009600 A CN 202011009600A CN 112179138 A CN112179138 A CN 112179138A
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gas
combustion
furnace
heat exchange
chamber
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CN112179138B (en
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张劲松
田冲
杨振明
徐奕辰
高勇
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Institute of Metal Research of CAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0045—Radiant burner
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)

Abstract

The invention belongs to the technical field of petrochemical equipment, and relates to a high-efficiency low-NOXA combustion heating furnace for discharging porous media, in particular to a heating furnace in the field of petrochemical industry. The furnace body comprises a combustion chamber and a medium-low temperature convection heat exchange chamber, the furnace chamber in the tubular furnace body is of a cavity structure, the burner is arranged in the center of the furnace chamber, the bottom of the burner is provided with a gas/air premixed gas inlet, the cavity formed between the burner and the inner surface of the furnace chamber is the combustion chamber, the combustion chamber is also a radiation heat exchange chamber, a radiation heat exchange tube is arranged between the burner and the inner surface of the furnace chamber, and the inner surface of the furnace chamber is lined with a silicon carbide material radiation heatThe reflector and the smoke discharge channel are arranged above the radiation heat exchange chamber to form a convection heat exchange chamber. The heating furnace is based on the porous medium combustion technology with silicon carbide foamed ceramics as the medium, the heat radiation intensity can be improved by more than one time compared with the conventional open flame combustion, and the heating furnace has the advantages of obvious fuel gas saving and low NOXAnd CO emission, and tail gas can meet the requirement of environmental protection emission without treatment.

Description

High-efficiency low NOXDischarge porousMedium combustion heating furnace
Technical Field
The invention belongs to the technical field of petrochemical equipment, and relates to a high-efficiency low-NOXThe porous medium discharged combustion heating furnace is suitable for various heating furnaces, in particular to the heating furnace in the field of petrochemical industry.
Background
At present, in the petrochemical industry, heating furnaces are generally adopted to increase the temperature of materials in a production pipeline to meet process requirements, such heating furnaces include atmospheric pressure furnaces, vacuum furnaces, hydrogen production furnaces, reforming furnaces, coking furnaces, reforming furnaces, cracking furnaces and the like, and most of fuels are natural gas, liquefied gas, dry gas and the like.
The existing heating furnace mostly adopts open flame burners, and due to the characteristics of the burner in the combustion process, the content of nitrogen oxides in flue gas after full combustion usually exceeds the specified content, and the energy consumption is increased due to excessive air; if the combustion is insufficient, harmful gases such as carbon monoxide and black smoke can be generated, so that the environment is polluted, the fuel consumption is increased, and the unit production energy consumption is increased. The length of a tube array of a common tube heating furnace is large, some tube arrays even reach more than ten meters, the length of a burner flame is required to be very long, the uniformity of a temperature field in a combustion area is difficult to guarantee, the nonuniformity of the heat intensity of the upper part and the lower part exists, flame or high-temperature flue gas passes through radiation, convection and conduction heat transfer quantity to a medium to be heated in the operation process of the tube heating furnace, wherein the radiation is a main heat transfer mode, generally, 70-80% of the heat of the whole furnace is exchanged by the heat transfer quantity, the convection heat transfer accounts for 20-30%, the flue gas radiation does not have the full spectrum characteristic due to the complex components of the flue gas and the selectivity of different gas heat radiation2And H2The heat radiation capacity of O is in proportional relation with the 3.5 th power and the 3 rd power of the temperature respectively, the infrared radiation coefficient of the flue gas is about 0.23, and the heat transfer capacity of the infrared radiation is limited, so in order to improve the heat radiation intensity of the heating furnace and meet the heating requirement, the combustion temperature is inevitably improved, and the heat radiation capacity of the solid material is in proportional relation with the 4 th power of the temperature, the radiation capacity is greatly enhanced compared with that of gas, for example, the gas radiation can be converted into the solid radiation by technical means, so that the solid radiation can not onlyThe radiant heat transfer efficiency can be improved, and the combustion temperature can be reduced, so that the heat efficiency of the whole furnace is greatly improved, and the fuel gas is saved.
The porous medium combustion technology is a brand new combustion mode developed in the international combustion field in more than ten years. Compared with the 'open flame' combustion with local high temperature during combustion, the combustion has NO open flame, the temperature and the uniformity of the combustion surface can be obviously improved, NOXThe generation of pollutants (such as nitric oxide, nitrogen dioxide and the like) is obviously reduced (more than 70 percent), wherein NO is contained in the pollutantsXLess than 30ppm and CO less than 10ppm, the direct discharge can meet the environmental protection requirement, and the solid porous medium (infrared radiation coefficient)>0.9) greatly enhances the radiation heat transfer, and because the solid radiation has no wavelength selectivity to the infrared radiation, the radiation heat transfer capability of the solid radiation is greatly enhanced compared with that of flue gas, so that the combustion heat utilization efficiency is greatly improved (even more than 50 percent in some cases).
Along with the enhancement of environmental awareness, the requirement on the content control of nitrogen oxides in flue gas in the field of petrochemical industry is higher and higher, and the high-efficiency and energy-saving consideration is taken into consideration. The application of the porous medium combustion technology in the heating furnace in the field of petrochemical industry is not reported, so that the development of high-efficiency and low-NO is realizedXThe porous medium combustion heating furnace develops low NO of the full combustion surface enhanced radiation heat transferXEfficient combustion furnaces are desirable in the industry.
Disclosure of Invention
Aiming at the defects of the existing 'open flame' gas heating furnace, the invention aims to provide a more efficient low-NO heating furnaceXThe emission heating furnace is based on the porous medium combustion technology with silicon carbide foamed ceramics as the medium, the heat radiation intensity can be improved by more than one time compared with the conventional open flame combustion, and the emission heating furnace has the advantages of obvious fuel gas saving and low NOXThe emission effect is that the tail gas can reach the environmental protection emission requirement without being treated.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
high-efficiency low NOXA vented porous media fired furnace comprising: furnace body, combustor, radiation heat transfer room, convection current heat transfer room, radiation heat exchange tube, radiation reflector, the concrete structure as follows:
the tubular furnace body has a cavity structure, the burner is arranged in the center of the furnace, the bottom of the burner is provided with a gas/air premixed gas inlet, a cavity formed between the burner and the inner surface of the furnace is a combustion chamber, the combustion chamber is also a radiation heat exchange chamber, a radiation heat exchange tube is arranged between the burner and the inner surface of the furnace, the inner surface of the furnace is lined with a silicon carbide material radiation reflector, and a smoke discharge channel is arranged above the radiation heat exchange chamber to form a convection heat exchange chamber.
The high efficiency low NOXThe porous medium combustion heating furnace is discharged, the radiation heat exchange tube is a steel tube or a spiral coil, and flowing materials or heat-conducting fluid needing to be heated is arranged inside the radiation heat exchange tube.
The high efficiency low NOXThe porous medium combustion heating furnace is characterized in that a convection heat exchange tube composed of heat exchange tubes or spiral coils is arranged in a convection heat exchange chamber, the convection heat exchange tubes are arranged in order, a flue gas baffle is arranged on the inner side of the furnace body above the convection heat exchange chamber, and a chimney for tail gas emission is arranged above the flue gas baffle.
The high efficiency low NOXThe porous medium combustion heating furnace is provided with a heat insulating layer inside the whole furnace body, and the heat insulating layer is arranged between the inner surface of the part of the furnace body positioned outside the hearth and the radiation reflector.
The high efficiency low NOXThe porous medium combustion heating furnace is characterized in that the lower end of the combustion chamber is a combustion chamber inlet, the upper end of the combustion chamber is a smoke outlet, the furnace body and the two ends of the combustion chamber are respectively connected in a sealing manner, a heated medium outlet is arranged on the wall of the furnace body close to the combustion chamber inlet, and a heated medium inlet is arranged on the wall of the furnace body close to the smoke outlet.
The high efficiency low NOXThe porous medium burning heating furnace has gas cavity as the inner layer, burning area as the surface layer, gas distributing board between the gas cavity and the burning area, and central burnerThe gas/air premixed gas enters the gas cavity through the gas/air premixed gas channel, is uniformly distributed by the gas distribution plate and then flows into the combustion area to be combusted in the combustion area to form a combustion surface, and the heat is radiated outwards to transfer heat.
The high efficiency low NOXAnd discharging the porous medium combustion heating furnace, wherein the combustion zone adopts silicon carbide foamed ceramics, the aperture of the silicon carbide foamed ceramics is 5-30 PPI, the porosity is 70-85%, and the surface of the silicon carbide foamed ceramics is coated with a high-temperature smoke corrosion and oxidation resistant thermal barrier coating which is required to resist the temperature of more than 1500 ℃.
The high efficiency low NOXAnd (3) discharging the porous medium combustion heating furnace, wherein the gas distribution plate is required to resist the temperature of more than 1400 ℃, the gas distribution plate is made of silicon carbide, cordierite, yttrium oxide, silicon nitride, alumina or ceramic fiber board, and straight-through holes with phi of 1-3 mm are uniformly distributed on the gas distribution plate.
The high efficiency low NOXThe heating furnace for burning the discharged porous medium uses a fuel gas with a calorific value ranging from 300 to 9000kcal/m3The method adopts refinery dry gas, coal gas, high-coke mixed coal gas, natural gas or liquefied gas.
The high efficiency low NOXThe furnace body inner hearth of the heating furnace is of a tubular cuboid cavity structure or a tubular cylindrical cavity structure, and is suitable for various heating furnaces, in particular to the heating furnace in the field of petrochemical industry.
The design idea of the invention is as follows: the method adopts the porous medium combustion technology which has the most advancement and development prospect in the prior combustion technology, utilizes the foam silicon carbide as the porous medium material, provides a modular burner assembly technology, and has the advantages of high thermal efficiency and high fuel utilization rate of a combustion system based on the characteristics of porous medium combustion, and the emission can meet the prior environmental protection requirement without treatment; meanwhile, the high infrared radiation performance of the silicon carbide material is combined, the silicon carbide material is innovatively provided to be used as the furnace lining to reflect infrared heat, so that the combustion-facing surface and the back surface of the heat exchanger are uniform in temperature field, the heat transfer effect is higher, and the efficiency and the pollution emission condition of the whole combustion furnace are the best choices in the existing combustion equipment.
One technical problem that the invention can solve is that: the existing gas heating furnace mostly adopts 'open flame' burners, and due to the characteristics of the burner in the combustion process, nitrogen oxides in flue gas after full combustion usually exceed the specified content, and the energy consumption is increased due to excessive air; if the combustion is insufficient, harmful gases such as carbon monoxide, black smoke and the like can be generated, so that the environment is polluted, and the energy consumption per unit production is reduced, and the space is limited. In order to solve the problems, the columnar porous medium combustor provided by the invention is based on the porous medium combustion theory, the combustion surface temperature and the uniformity thereof can be obviously improved, and NO isXAnd the generation of pollutants such as CO and the like is obviously reduced, the environment-friendly requirement can be met by directly discharging, and meanwhile, the gas can be saved by 30%.
Another technical problem that the invention can solve is: the radiation heat transfer in the radiation heat exchange chamber of the existing gas heating furnace is mainly based on high-temperature flue gas radiation, the infrared radiation coefficient of the radiation heat transfer chamber is lower than 0.23, and the radiation heat transfer efficiency is low. Aiming at the problems, the columnar combustor based on porous medium combustion can realize high-efficiency combustion of fuel and improve the utilization rate of the fuel; the combustion surface temperature is uniform, the combustion temperature can be well controlled, and NO is avoidedXCO, etc., wherein NO is producedXLess than 30ppm, less than 10ppm of CO, and the tail gas can reach the national emission standard without treatment; the combustion surface is made of silicon carbide foam ceramic material, the infrared emission coefficient of the silicon carbide foam ceramic material is above 0.9, and meanwhile, the inner side of the furnace wall is lined with a ceramic reflection lining with high infrared emission coefficient, so that the combination of the ceramic reflection lining and the ceramic reflection lining can greatly improve the radiation heat exchange efficiency of the heating furnace and the heat exchange efficiency of the heating furnace.
The invention has the following advantages and beneficial effects:
1. in the petrochemical process, a gas heating furnace is widely adopted, and the source of gas fuel is gas or natural gas, liquefied gas and the like produced in the production process. The heating furnace is based on the porous medium combustion theory, adopts the silicon carbide foamed ceramic as the porous medium, has no open flame during combustion, has sufficient combustion and uniform combustion surface temperature, and can avoid local combustionWhen the temperature is too high, thermal NO is generatedXTo achieve low NOXEmission, NO in the tail gasXLess than 30ppm and less than 10ppm of CO, thereby reducing the treatment cost of pollutants.
2. The heating furnace of the invention is suitable for the fuel gas with a large variation range of 300-9000 kcal/m3The fuel can be various types of gas fuel such as refinery dry gas, coal gas, high-coke mixed gas, natural gas or liquefied gas and the like.
3. The ceramic reflection lining with high infrared emission coefficient is lined on the inner side of the furnace wall, and the radiation heat transfer efficiency is greatly improved compared with the flue gas radiation of an open flame burner by matching with the combustion surface of the columnar porous medium burner, so that the radiation heat transfer efficiency is enhanced.
4. The furnace body and the combustion chamber of the heating furnace are various forms such as a tubular round furnace chamber or a square furnace chamber, and the heating furnace can be manufactured into various forms such as a tubular high-temperature high-pressure heating furnace, a tubular steam generation furnace, a tubular heat-conducting medium heating furnace and the like according to actual requirements.
In a word, the novel porous medium combustion heating furnace enhances the infrared radiation heat transfer efficiency, and has obvious high-efficiency energy-saving and low NOXAnd the like.
Drawings
FIG. 1 is a schematic view of a porous medium combustion furnace.
In the figure, 1, a furnace body; 2. a burner; 3. a radiant heat exchange chamber; 4. a convective heat exchange chamber; 5. a radiant heat exchange tube; 6. a convection heat exchange tube; 7. a heat-insulating layer; 8. a radiation mirror; 9. a gas/air premix gas inlet; 10. a flue gas baffle; 11. and (4) a chimney.
FIG. 2 is a schematic view of a square column porous media burner. In the figure, 9, a gas/air premix gas inlet; 21. a burning surface; 26. a cube combustion unit module.
FIG. 3 is a schematic view of a cylindrical porous medium burner. In the figure, 9, a gas/air premix gas inlet; 21. a burning surface; 27. and the arc-shaped body combustion unit module.
FIG. 4 is a schematic half-section view of a square or cylindrical porous medium burner. In the figure, 21, the combustion surface; 22. a gas chamber; 23. a silicon carbide ceramic foam combustion zone; 24. a gas distribution plate; 25. a gas/air premix gas passage.
Detailed Description
The present invention will be described in further detail below by way of examples and figures.
Examples
The specific embodiment of the heating furnace using the porous medium burner is described by taking a porous medium combustion heating furnace with a square furnace body as an example.
As shown in figures 1-4, the invention has high efficiency and low NO contentXThe porous medium discharging combustion heating furnace mainly comprises: furnace body 1, combustor 2, radiation heat transfer room 3 (combustion chamber), convection current heat transfer room 4, radiation heat exchange tube 5, convection current heat exchange tube 6, heat preservation 7, radiation reflector 8, gas/air premix gas inlet 9, flue gas baffle 10, chimney 11 etc. and specific structure is as follows:
the inner surface of the furnace body of the combustion chamber is lined with a high infrared radiation coefficient ceramic reflector which is made of silicon carbide, and the surface facing the heat exchanger is subjected to certain polishing treatment to increase the infrared reflection effect.
The internal hearth of the tubular furnace body 1 is of a cuboid cavity structure, the square column-shaped porous medium burner 2 is installed in the center of the hearth, a gas/air premixed gas inlet 9 is installed at the bottom of the burner 2, gas/air premixed gas enters from the gas/air premixed gas inlet 9 and is uniformly distributed into each burner unit, the gas/air premixed gas is uniformly distributed and flows out through a gas distribution plate 24 to enter a silicon carbide foamed ceramic combustion area 23 for combustion, and a furnace door for maintenance is installed in front of the furnace body 1. The cavity that forms between combustor 2 and the furnace internal surface is the combustion chamber, also is radiation heat transfer chamber 3, be equipped with radiation heat exchange tube 5 between combustor 2 and the furnace internal surface, radiation heat exchange tube 5 can be steel tubulation or spiral coil, the inside material or the heat-conducting fluid that need heat for flowing of radiation heat exchange tube 5, furnace internal surface is lined with carborundum material radiation reflector 8 of high infrared emission coefficient, can play the effect of reinforcing radiation heat transfer, it is certain polishing treatment to face radiation heat transfer chamber 3 one side, increase infrared reflection effect. A smoke discharge channel is arranged above the radiation heat exchange chamber 3 (combustion chamber) to form a convection heat exchange chamber 4, a convection heat exchange tube 6 consisting of heat exchange tubes or spiral coils is arranged in the convection heat exchange chamber 4, and the convection heat exchange tubes 6 are arranged in order and used for low-temperature heat exchange at 300-500 ℃. The inner side of the furnace body above the convection heat exchange chamber 4 is provided with a flue gas baffle plate 10, a chimney 11 for tail gas emission is arranged above the flue gas baffle plate 10, a heat preservation layer 7 is arranged in the whole furnace body to play a role in heat preservation and heat insulation, and a heat preservation layer is arranged between the inner surface of the part of the furnace body 1 positioned outside the hearth and the radiation reflector 8. The lower extreme of combustion chamber is the combustion chamber entry, and the upper end of combustion chamber is the exhaust port, and sealing connection respectively between the both ends of furnace body 1 and combustion chamber is being close to be equipped with the heated medium export on the furnace body wall of combustion chamber entry, be equipped with the heated medium entry on the furnace body wall of being close to the exhaust port, the total length of tubular furnace body is 5 ~ 45 times of its diameter. The medium to be heated enters the heat exchanger channel for the medium to be heated, flows through the heat exchange tubes, passes through the high-temperature radiation heat exchange chamber and the medium-low temperature heat exchange chamber, is heated to the process required temperature after heat exchange, and then flows out from the heated medium outlet.
As shown in fig. 2, the square column-shaped porous medium burner 2 is formed by arranging and combining a plurality of square combustion unit modules 26, four side surfaces of the square column-shaped porous medium burner 2 are combustion surfaces 21, and the bottom of the square column-shaped porous medium burner 2 is provided with a gas/air premixed gas inlet 9.
As shown in fig. 1 and 4, the combustor 2 is composed of a plurality of cube combustion unit modules 26 or arc combustion unit modules 27, and has the following internal half-section structure: the inner layer of the combustor 2 is a gas cavity 22, the surface layer of the combustor 2 is a silicon carbide ceramic foam combustion area 23, a gas distribution plate 24 is arranged between the gas cavity 22 and the silicon carbide ceramic foam combustion area 23, a gas/air premixed gas channel 25 is arranged in the center of the combustor 2, the lower end of the gas/air premixed gas channel 25 is a gas/air premixed gas inlet 9, the middle of the side surface of the gas cavity 22 is communicated with the gas/air premixed gas channel 25, and the gas/air premixed gas enters the gas cavity 22 through the gas/air premixed gas channel 25, is uniformly distributed by the gas distribution plate 24, flows into the silicon carbide ceramic foam combustion area 23, is combusted in the silicon carbide ceramic foam combustion area to form a combustion surface 21, and radiates and transfers heat outwards.
Table 1, the main geometric dimensions of the porous medium combustion heating furnace can be given as follows:
Figure BDA0002697130670000061
the device of the invention is applied, and the following are specific examples:
as shown in fig. 1-4, heat conducting oil is selected as a heated medium for comparison, the heat conducting oil flows in from an inlet of the convection heat exchange tube 6 and flows out from the radiation heat exchange tube 5, the gas/air premixed gas is respectively introduced into each combustion unit through the gas/air premixed gas channel 25, high-temperature flue gas generated by combustion respectively heats heat conducting oil fluid in the convection heat exchange tube 6 and the radiation heat exchange tube 5 through convection heat exchange and radiation heat exchange, and the heat conducting oil flow rates of different furnace types are different.
Heat load: through gas flow calculation, the equivalent thermal load of the combustion surface of each burner unit module is 20 KW; 1#The heat load of the furnace type whole furnace is 1920 kW; 2#The heat load of the furnace type whole furnace is 2560 kW; 3#The heat load of the furnace type whole furnace is 3200 kW.
Heating effect: 1#The flow of furnace type heat conduction oil is 2.91 tons/hour, and the temperature of the heat conduction oil rises to 250 ℃; the flow of the 2# furnace type heat conduction oil is 4.01 tons/hour, and the temperature of the heat conduction oil rises to 253 ℃; the flow rate of the 3# furnace type heat conduction oil is 5.05 tons/hour, and the temperature rise of the heat conduction oil is 249 ℃.
The heat efficiency of the whole furnace is as follows: 1#The furnace type is 95 percent; 2#Furnace type 97%, 3#The furnace type is 97%.
And (3) tail gas emission: 1#Furnace type NOX：15ppm、CO：5ppm；2#Furnace type NOX：18ppm、CO：8ppm；3#Furnace type NOX：20ppm、CO：7ppm。
In this embodiment, only three implementation cases of a square furnace chamber combustion furnace are listed, and the internal furnace chamber of the furnace body 1 can be designed to be a tubular cylindrical cavity structure, and the specific implementation manner is similar to this embodiment, except that the combination of the square combustion unit modules 26 is replaced by the combination of the arc combustion unit modules 27, and the structures such as the heat exchange tubes in the furnace body 1 are replaced by the tubular cylindrical cavity structure. As shown in FIG. 3, the cylindrical porous medium burner 2 is formed by arranging and combining a plurality of arc-shaped combustion unit modules 27, the side surface of the cylindrical porous medium burner 2 is a combustion surface 21, and the bottom of the cylindrical porous medium burner 2 is provided with a gas/air premixed gas inlet 9.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
The results of the examples show that the invention provides a novel high-efficiency low NOXThe porous medium combustion furnace has high heat efficiency, low tail gas pollutant content, obvious economic performance and environment friendship.

Claims (10)

1. High-efficiency low NOXAn exhaust porous medium combustion furnace, comprising: furnace body, combustor, radiation heat transfer room, convection current heat transfer room, radiation heat exchange tube, radiation reflector, the concrete structure as follows:
the tubular furnace body has a cavity structure, the burner is arranged in the center of the furnace, the bottom of the burner is provided with a gas/air premixed gas inlet, a cavity formed between the burner and the inner surface of the furnace is a combustion chamber, the combustion chamber is also a radiation heat exchange chamber, a radiation heat exchange tube is arranged between the burner and the inner surface of the furnace, the inner surface of the furnace is lined with a silicon carbide material radiation reflector, and a smoke discharge channel is arranged above the radiation heat exchange chamber to form a convection heat exchange chamber.
2. High efficiency low NO according to claim 1XThe combustion heating furnace with porous medium exhaust is characterized in that the radiation heat exchange tube is a steel tube or a spiral coil, and the inside of the radiation heat exchange tube is provided with a flowThe moving materials or heat transfer fluids to be heated.
3. High efficiency low NO according to claim 1XThe combustion heating furnace for discharging porous media is characterized in that convection heat exchange tubes consisting of heat exchange tubes or spiral coils are arranged in a convection heat exchange chamber and are arranged in order, a flue gas baffle is arranged on the inner side of the furnace body above the convection heat exchange chamber, and a chimney for discharging tail gas is arranged above the flue gas baffle.
4. High efficiency low NO according to claim 1XThe combustion heating furnace with porous medium exhaust is characterized in that a heat insulation layer is arranged in the whole furnace body, and the heat insulation layer is arranged between the inner surface of the part of the furnace body positioned outside the hearth and the radiation reflector.
5. High efficiency low NO according to claim 1XThe combustion heating furnace for discharging the porous media is characterized in that the lower end of the combustion chamber is a combustion chamber inlet, the upper end of the combustion chamber is a smoke outlet, the furnace body and the two ends of the combustion chamber are respectively connected in a sealing manner, a heated medium outlet is arranged on the wall of the furnace body close to the combustion chamber inlet, and a heated medium inlet is arranged on the wall of the furnace body close to the smoke outlet.
6. High efficiency low NO according to claim 1XThe combustion heating furnace for discharging the porous media is characterized in that the inner layer of the combustor is a gas cavity, the surface layer of the combustor is a combustion area, a gas distribution plate is arranged between the gas cavity and the combustion area, a gas/air premixed gas channel is arranged in the center of the combustor, a gas/air premixed gas inlet is formed in the lower end of the gas/air premixed gas channel, the middle of the side face of the gas cavity is communicated with the gas/air premixed gas channel, and the gas/air premixed gas enters the gas cavity through the gas/air premixed gas channel, is uniformly distributed through the gas distribution plate and then flows into the combustion area to be combusted in the combustion area to form a combustion surface and radiates and transfers heat outwards.
7. High efficiency low NO according to claim 6XThe combustion heating furnace with the discharged porous medium is characterized in that a combustion zone adopts silicon carbide foamed ceramics, the aperture of the silicon carbide foamed ceramics is 5-30 PPI, the porosity is 70-85%, and the surface of the silicon carbide foamed ceramics is coated with a high-temperature smoke corrosion and oxidation resistant thermal barrier coating which is required to resist the temperature of more than 1500 ℃.
8. High efficiency low NO according to claim 6XThe discharged porous medium combustion heating furnace is characterized in that the gas distribution plate is required to resist the temperature of more than 1400 ℃, the material of the gas distribution plate is silicon carbide, cordierite, yttrium oxide, silicon nitride, alumina or ceramic fiber board, and straight through holes with phi of 1-3 mm are uniformly distributed on the gas distribution plate.
9. High efficiency low NO according to claim 1XThe discharged porous medium combustion heating furnace is characterized in that the variation range of the calorific value of fuel gas used by the heating furnace is 300-9000 kcal/m3The method adopts refinery dry gas, coal gas, high-coke mixed coal gas, natural gas or liquefied gas.
10. High efficiency low NO according to claim 6XThe combustion heating furnace for discharging porous media is characterized in that a furnace hearth in a furnace body of the heating furnace is of a tubular cuboid cavity structure or a tubular cylindrical cavity structure, and is suitable for various heating furnaces, particularly the heating furnace in the field of petrochemical industry.
CN202011009600.6A 2020-09-23 2020-09-23 High-efficiency low NOXCombustion heating furnace discharging porous medium Active CN112179138B (en)

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CN115650567A (en) * 2022-11-01 2023-01-31 松山湖材料实验室 Glass tempering heating furnace

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CN114017762A (en) * 2021-11-09 2022-02-08 江苏双良锅炉有限公司 Horizontal internal combustion steam boiler with porous ceramic medium combustion
CN115650567A (en) * 2022-11-01 2023-01-31 松山湖材料实验室 Glass tempering heating furnace
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