CN218443303U - Tubular heating furnace - Google Patents
Tubular heating furnace Download PDFInfo
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- CN218443303U CN218443303U CN202222281016.7U CN202222281016U CN218443303U CN 218443303 U CN218443303 U CN 218443303U CN 202222281016 U CN202222281016 U CN 202222281016U CN 218443303 U CN218443303 U CN 218443303U
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Abstract
The utility model discloses a tubular heating furnace, its is coaxial from interior to including outward: the two ends of the first-stage rectifying tube are sealed, and a plurality of rows of round holes are uniformly formed in the tube wall; two ends of the second-stage rectifying tube are sealed, and a plurality of rows of runway-shaped holes are uniformly formed in the tube wall; a metal fiber net surrounding the second-stage rectifying tubeAn outer side; and the top end of the hearth shell is provided with a smoke outlet, the bottom end of the hearth shell is provided with an air inlet, the air inlet is communicated with the bottom end of the primary rectifier tube, the smoke outlet is communicated with the flow divider, the smoke is divided into two paths by the flow divider, the first path of smoke is discharged outside, the second path of smoke is returned to the air inlet, and a furnace tube is arranged between the hearth shell and the metal fiber mesh. The utility model discloses a tubular heating furnace adopts metal fiber net and sets up the two-stage rectifier tube, can make heat distribution even, suppresses NOx's production. Through the backflow of flue gas and the injection of pure oxygen at an air inlet, the N in the furnace is reduced 2 The content of the NOx in the fuel gas fundamentally limits the formation of NOx, reduces the amount of flue gas and improves the combustion efficiency.
Description
Technical Field
The utility model relates to a tubular furnace technical field, in particular to a tubular heating furnace for refinery plant industry.
Background
At present, the tubular heating furnaces in refineries are still mostly made of fossil fuels. In the case of diffusion combustion, a certain amount of NOx will be formed in the exhaust gases from the combustion of fossil fuels. Once the NOx is discharged into the atmosphere, photochemical smog pollution is caused, even acid rain is formed, and the atmospheric environment and human health are seriously harmed. And carry out denitration treatment again will promote the burning cost to tail gas through external device. In addition, CO emitted from fossil fuel combustion 2 Is a major greenhouse gas, a large amount of CO 2 Emissions can lead to global temperature rise and other climate changes, and therefore CO 2 The development of emission limiting technologies is not slow.
On the other hand, when the working strength of the tube furnace changes, the combustion strength needs to be adjusted in time. However, the adjustable range of the combustion intensity of the traditional diffusion combustion tube furnace is very limited, and adverse phenomena such as tempering or blow-out and the like are very easy to occur in the power adjustment process, so that the safe operation of the combustion furnace is influenced. Therefore, the research on the development of the technology for optimizing the efficient combustion of the fuel and controlling the low pollution for the tubular heating furnace is of great significance.
The low-nitrogen combustion technology is a novel fossil fuel combustion technology, and has attracted extensive attention and developed rapidly in recent years due to its combustion characteristics of low temperature, high efficiency and low pollutant emission.
Patent document CN106415127a relates to a dispersed flameless combustor (mld), which realizes high dilution and heat exchange of reactants by high-speed jet entrainment of flue gas, and finally forms dispersed combustion in the whole furnace chamber, thereby realizing flameless, uniform and stable combustion reaction in the furnace, reducing peak temperature and inhibiting formation of thermal NOx.
Patent document CN210951320U relates to a low-concentration gas direct-fired metal fiber burner. When the metal fiber combustor works, the fan is started, the fan conveys air to the machine body through the air inlet box, impurities in the air can be filtered by the air through the filter element in the air inlet box, dust in the air is prevented from entering the machine body, and the drying agent layer dries the air, so that the humidity of the air is reduced.
Although the above technologies can realize flameless combustion, the combustion efficiency is improved to a certain extent, and the emission of NOx is reduced. However, the practical application is difficult to meet the requirements of the industrial tubular furnace of the refinery plant, and the realization of the large amount of CO in the flue gas cannot be realized 2 Trapping and recovering.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a tubular heating furnace, so as to improve the NOx and CO existing in the tubular heating furnace in the prior art 2 The problem of discharge.
In order to achieve the above object, the present invention provides a tubular heating furnace, which comprises from inside to outside: the two ends of the first-stage rectifying tube are sealed, and a plurality of rows of round holes are uniformly formed in the tube wall; two ends of the second-stage rectifier tube are sealed, and a plurality of rows of runway-shaped holes are uniformly arranged on the tube wall; the metal fiber net is arranged around the outer side of the secondary rectifying tube; and the top end of the hearth shell is provided with a smoke outlet, the bottom end of the hearth shell is provided with an air inlet, the air inlet is communicated with the bottom end of the primary rectifying tube, the smoke outlet is communicated with the splitter, the smoke is divided into two paths by the splitter, the first path of smoke is discharged outside, the second path of smoke flows back to the air inlet, and a furnace tube is arranged between the hearth shell and the metal fiber mesh.
Further, in the above technical scheme, the second path of flue gas is converged with the fuel gas and the oxygen gas by the mixing pump and then sprayed into the air inlet.
Furthermore, in the above technical solution, a tesla non-return tube is disposed between the air inlet and the first-stage rectifying tube.
Further, in the above technical scheme, the mixing pump is provided with a flow control valve, and the flow control valve regulates the flow of the second path of flue gas, the oxygen and the fuel gas.
Furthermore, in the above technical solution, the flow control valve makes the oxygen content in the mixed gas injected into the air inlet equivalent to the air excess coefficient of 1.02 to 1.05.
Further, in the above technical scheme, the fuel gas is methane.
Furthermore, in the above technical solution, the diameter of each row of circular holes of the first-stage rectifier tube gradually increases from the middle to the two ends; the length of each row of runway-shaped holes of the two-stage rectifier tube is gradually increased from the middle to the two ends.
Further, in the above technical solution, the height of the second-stage rectifier tube is greater than that of the first-stage rectifier tube; the height of the metal fiber net is the same as that of the two-stage rectifier tube.
Furthermore, in the above technical scheme, the inner wall of the hearth shell is laid with a glass wool noise reduction layer.
Further, in the technical scheme, the thickness of the glass wool noise reduction layer is greater than or equal to 50mm.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a tubular heating furnace adopts the metal fiber net as the combustor to set up the two-stage rectifier tube, in order to ensure to mix gas evenly distributed in advance on the metal fiber net, can make heat distribution even, avoid the formation of local high temperature, restrain NOx's production.
2. By the backflow of the flue gas and the injection of pure oxygen at the air inlet, the N in the furnace can be greatly reduced 2 The content of the (C) can fundamentally limit the formation of NOx, reduce the smoke amount and improve the combustion efficiencyAnd (4) rate.
3. High concentration of CO produced by combustion 2 Part of the flue gas flows back, the returned flue gas can be used as part of premixed gas to dilute the oxygen concentration, so that the safety of the combustion process is improved, and the high-temperature flue gas can preheat oxygen and fuel gas, so that the temperature of the premixed gas is improved, and finally the super-enthalpy combustion of the combustor is realized; another part of CO 2 Flue gas can flow into CO 2 A capture, compression and recovery system for realizing CO 2 And (4) near zero emission. CO in flue gas after circular combustion 2 The concentration is extremely high, not less than 80 percent, and is beneficial to CO 2 The capture and recovery of the flue gas can reduce CO in the flue gas 2 Energy consumption for recovery and purification.
4. The burner is a cylindrical metal fiber burner, the peak temperature is low in the combustion process, and the heat release is uniform. The energy generated by combustion is transmitted in a radiation mode by more than 70%, so that the comprehensive combustion and heat transfer efficiency of the combustor is improved, and the consumption of fuel can be reduced.
5. The glass wool noise reduction layer is laid on the inner wall of the hearth shell, so that high-frequency noise generated in the premixed gas injection and combustion processes can be reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means easier to be implemented according to the content of the description, and to make the above and other objects, technical features, and advantages of the present invention easier to understand, one or more preferred embodiments are described below, and the following detailed description is given with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of a tube heating furnace according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a one-stage rectifier according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a two-stage rectifier according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a tesla check tube according to an embodiment of the present invention.
Description of the main reference numerals:
11-a first-stage rectifying tube, 111-a circular hole, 12-a second-stage rectifying tube, 121-a runway-shaped hole, 13-a metal fiber mesh, 20-a furnace tube, 30-a hearth shell, 31-an air inlet, 32-a smoke outlet, 40-a mixing pump, 41-a flow control valve, 50-a flow divider, 51-a first path of smoke, 52-a second path of smoke, 60-a glass wool noise reduction layer, 70-fuel gas, 80-oxygen and 90-a Tesla non-return tube.
Detailed Description
The following detailed description of the present invention is provided with reference to the accompanying drawings, but it should be understood that the scope of the invention is not limited by the detailed description.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the article in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The articles may have other orientations (rotated 90 degrees or otherwise) and the spatially relative terms used herein should be interpreted accordingly.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
As shown in fig. 1 to 3, according to the tubular heating furnace of the embodiment of the present invention, a cylindrical metal fiber burner is coaxially disposed in the furnace casing 30. The cylindrical metal fiber burner comprises a first-stage rectifying pipe 11, a second-stage rectifying pipe 12 and a metal fiber net 13 from inside to outside. Two ends of the first-stage rectifying tube 11 are sealed, and a plurality of rows of round holes 111 are uniformly arranged on the tube wall; two ends of the second-stage rectifying tube 12 are sealed, and a plurality of rows of runway-shaped holes 121 are uniformly formed in the tube wall; the metal fiber net 13 is arranged around the outer side of the secondary rectifying pipe 12. The top end of the hearth shell 30 is provided with a smoke outlet 32, the bottom end of the hearth shell is provided with an air inlet 31, the air inlet 31 is communicated with the bottom end of the first-stage rectifying tube 11, and the smoke outlet 32 is externally connected with a flow divider 50. The flue gas is divided into two paths by the flow divider 50, the first path of flue gas 51 is discharged outside, for example, to a flue gas enrichment and recovery device, the second path of flue gas 52 flows back to the gas inlet 31, and a furnace tube 20 is arranged between the furnace shell 30 and the metal fiber mesh 13.
Further, in one or more exemplary embodiments of the present invention, a mixing pump 40 is provided upstream of the air inlet 31. The mixing pump 40 is provided with three gas inlets, the second path of flue gas 52, the fuel gas 70 and the oxygen 80 are respectively injected, and the three paths of gas are converged by the mixing pump 40 to form combustible premixed gas and then are injected into the gas inlet 31. Further, as shown in fig. 4, in one or more exemplary embodiments of the present invention, a tesla check pipe 90 is disposed between the air inlet 31 and the first-stage rectifying pipe 11, and the combustible premixed gas is injected into the first-stage rectifying pipe 11 of the cylindrical metal fiber burner through the tesla check pipe 90. The combustible premixed gas is divided by the first-stage rectifying pipe 11 and the second-stage rectifying pipe 12 and then is uniformly distributed on the metal fiber net 13 for combustion. High-temperature flue gas generated after combustion is discharged into the flow divider 50 from the smoke outlet 32, and the first path of flue gas 51 is high-concentration CO 2 Flue gas can be collected and recovered to realize CO 2 Near zero emission; the second flue gas 52 flows back into the mixing pump 40.
Further, in one or more exemplary embodiments of the present invention, the mixing pump 40 is provided with a flow control valve 41, and under different operating conditions, the flow control valve 41 can be adjusted according to actual conditions to adjust the proportion and flow rate of the second flue gas 52, the oxygen 80 and the fuel gas 70.
Further, in one or more exemplary embodiments of the present invention, the flow control valve 41 makes the oxygen content of the combustible premixed gas injected into the gas inlet 31 equivalent to the air excess coefficient of 1.02 to 1.05.
Further, in one or more exemplary embodiments of the present invention, the fuel gas 70 is methane.
Further, in one or more exemplary embodiments of the present invention, the diameter of each row of the circular holes 111 of the first-stage rectifying pipe 11 gradually increases from the middle to both ends; the length of each row of racetrack shaped holes 121 of the two-stage rectifier tube 12 gradually increases from the middle to the two ends. That is, the cross-sectional areas of the circular holes 111 and the racetrack-shaped holes 121 are small in the middle and large at both ends in the axial direction to ensure uniform distribution of the combustible premixed gas over the metal fiber web.
Further, in one or more exemplary embodiments of the present invention, the height of the secondary rectifier tube 12 is greater than the height of the primary rectifier tube 11; the height of the metal fiber net 13 is the same as that of the secondary rectifier tube 12.
Further, in one or more exemplary embodiments of the present invention, the inner wall of the furnace shell 30 is coated with a glass wool noise reduction layer 60. Illustratively, the glass wool noise reduction layer 60 has a thickness of not less than 50mm to reduce high frequency noise generated during the injection and combustion of the combustible premixed gas.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the invention and various alternatives and modifications. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments shall fall within the scope of the present invention.
Claims (10)
1. A tube heater, comprising, coaxially from inside to outside:
the two ends of the first-stage rectifying tube are sealed, and a plurality of rows of round holes are uniformly formed in the tube wall;
two ends of the second-stage rectifying tube are sealed, and a plurality of rows of runway-shaped holes are uniformly formed in the tube wall;
the metal fiber net is arranged around the outer side of the secondary rectifying tube; and
the top end of the hearth shell is provided with a smoke outlet, the bottom end of the hearth shell is provided with an air inlet, the air inlet is communicated with the bottom end of the first-stage rectifying tube, the smoke outlet is communicated with the flow divider, smoke is divided into two paths by the flow divider, the first path of smoke is discharged outwards, the second path of smoke flows back to the air inlet, and a furnace tube is arranged between the hearth shell and the metal fiber mesh.
2. The tube furnace of claim 1, wherein the second flue gas is injected into the inlet after being merged with fuel gas and oxygen by a mixing pump.
3. The tube furnace according to claim 2, wherein a Tesla return tube is provided between the inlet and the primary rectifier tube.
4. The tube furnace of claim 3, wherein the mixing pump is provided with a flow control valve that regulates the flow of the second flue gas, oxygen and fuel gas.
5. The tube furnace according to claim 4, wherein the flow control valve is configured such that the oxygen content of the mixed gas injected into the gas inlet is equivalent to an air excess coefficient of 1.02 to 1.05.
6. The tube furnace according to claim 2, wherein the fuel gas is methane.
7. The tube furnace according to claim 1, wherein the diameter of each row of the circular holes of the primary rectifying tube is gradually increased from the middle to the two ends; the length of each row of runway-shaped holes of the two-stage rectifier tube is gradually increased from the middle to the two ends.
8. The tube furnace according to claim 1, wherein the height of the secondary rectifier tube is greater than the height of the primary rectifier tube; the height of the metal fiber net is the same as that of the two-stage rectifying tube.
9. The tube furnace according to claim 1, wherein the inner wall of the furnace shell is coated with a glass wool noise reduction layer.
10. The tube furnace according to claim 9, wherein the glass wool noise reduction layer has a thickness of 50mm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222281016.7U CN218443303U (en) | 2022-08-29 | 2022-08-29 | Tubular heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222281016.7U CN218443303U (en) | 2022-08-29 | 2022-08-29 | Tubular heating furnace |
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| Publication Number | Publication Date |
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| CN218443303U true CN218443303U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222281016.7U Active CN218443303U (en) | 2022-08-29 | 2022-08-29 | Tubular heating furnace |
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| CN (1) | CN218443303U (en) |
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- 2022-08-29 CN CN202222281016.7U patent/CN218443303U/en active Active
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