A multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas

Abstract

This invention discloses a multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas. The device includes a shell, a heating chamber, a mixing chamber, and a funnel-shaped structure inside the shell. The gas is heated in the heating chamber and then enters the mixing chamber for mixing. The top of the mixing chamber is connected to a blended gas outlet pipe for outputting the blended gas. This invention achieves low-cost, low-energy-consumption, and high-efficiency gas blending, improving the quality and efficiency of gas blending in heating furnace production lines.

Description

Technical Field

[0001] This invention relates to the field of gas mixer technology, and more specifically to a multi-element gas mixing device based on the utilization of waste heat from heating furnace exhaust gas. Background Technology

[0002] In the field of heating furnaces, blending different components of fuel gas has become a common fuel utilization method. Blending fuel gas optimizes the combustion process by combining the combustion characteristics of each component, improving energy efficiency and reducing pollutant emissions. Secondly, blending fuels with different prices allows for flexible control of production costs, especially when certain fuels are expensive or limited in supply; using cheaper fuels can effectively reduce costs. Furthermore, some fuels may pose high risks at high purity; blending with other fuels can reduce these risks.

[0003] Uneven mixing of blended gas can lead to incomplete and unstable combustion, increased pollutant emissions, damage to the heating furnace, and an increased risk of combustion and explosion. Therefore, gas blending devices are crucial for heating furnaces utilizing blended gas. Currently, gas mixing methods are mainly divided into free mixing and stirred mixing. Free mixing involves introducing different gases into a mixing tank, where they mix freely due to diffusion. However, due to differences in gas density, lighter gases rise while heavier gases sink, resulting in stratification and poor mixing. Free mixing is slow and inefficient, making it unsuitable for large-scale gas mixing applications. Stirred mixing is the commonly used method in industry. It requires installing a stirring mechanism and power system in the mixing tank. The power system drives the stirring mechanism to agitate the gas and achieve mixing. While stirred mixing improves mixing efficiency, the required stirring mechanism and power system increase the size and cost of the device, and also consume significant energy during operation. Furthermore, the stirring mechanism cannot fully agitate the gas at the bottom, top, and corners, potentially leading to insufficient and uneven mixing. Summary of the Invention

[0004] To overcome the above problems, achieve low-cost, low-energy-consumption, and efficient gas blending, and improve the quality and efficiency of gas blending in heating furnace production lines, this invention proposes a multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A multi-element gas mixing device based on the utilization of waste heat from heating furnace exhaust gas includes a shell 1. The shell 1 is provided with a heating chamber 3, a mixing chamber 4, and a funnel-shaped structure. The heating chamber 3 covers the bottom and lower sidewall of the mixing chamber 4, and the top of the mixing chamber 4 is provided with a funnel-shaped structure.

[0007] The heating chamber 3 is hollow inside, and a through hole is opened at the bottom of the heating chamber 3. The low-density gas pipeline 8 passes through the through hole. One end of the low-density gas pipeline 8 is connected to the low-density gas source, and the other end is connected to the low-density gas distribution plate 81. The low-density gas distribution plate 81 is located at the bottom of the mixing chamber 4. The central axis of the low-density gas distribution plate 81 coincides with the central axis of the mixing chamber 4. Several gas outlet holes I are provided on the low-density gas distribution plate 81.

[0008] A through hole is opened on the lower side of the heating chamber 3, through which a medium-density gas pipe 9 passes. One end of the medium-density gas pipe 9 is connected to a medium-density gas source, and the other end of the medium-density gas pipe 9 is a coil, which is set inside the heating chamber 3. The outlet of the medium-density gas pipe 9 is connected to a medium-density gas distribution plate 91. The medium-density gas distribution plate 91 is set at the bottom of the mixing chamber 4. The central axis of the medium-density gas distribution plate (91) coincides with the central axis of the mixing chamber 4. Several gas outlet holes II are set on the medium-density gas distribution plate 91.

[0009] Another through hole is provided above the through hole of the medium density gas pipe 9 on the side of the heating chamber 3. The high density gas pipe 7 passes through this through hole. One end of the high density gas pipe 7 is connected to the high density gas source, and the other end of the high density gas pipe 7 is a coil, which is set inside the heating chamber 3. The outlet of the high density gas pipe 7 is connected to the high density gas distribution plate 71. The high density gas distribution plate 71 is set on the side wall of the mixing chamber 4. The central axis of the high density gas distribution plate 71 coincides with the central axis of the mixing chamber 4. Several gas outlet holes III are provided on the high density gas distribution plate 71.

[0010] A gas inlet 5 is provided at the bottom of the heating chamber 3, and the gas inlet 5 is hollowly connected to the interior of the heating chamber 3. A gas outlet 6 is provided on the side of the heating chamber 3.

[0011] A mixed gas outlet 13 is provided at the top of the funnel-shaped structure.

[0012] The air outlet I is a through hole that faces outward from the central axis of the mixing chamber 4 at an angle of 0 to 70°; the air outlet II is a through hole that faces inward from the central axis of the mixing chamber 4 at an angle of 20 to 70°; and the air outlet III is a through hole that faces inward from the central axis of the mixing chamber 4 at a horizontal angle of -80 to 80°.

[0013] The outer diameter of the medium-density gas distribution plate 91 is smaller than the inner diameter of the mixing chamber 4, and the outer diameter of the low-density gas distribution plate 81 is smaller than the inner diameter of the medium-density gas distribution plate 91.

[0014] A porous medium 12 is provided in the upper part and the funnel-shaped structure at the top of the mixing chamber 4; the porosity of the porous medium 12 increases from bottom to top.

[0015] The heating chamber 3, the mixing chamber 4, and the funnel-shaped structure are covered with a heat insulation layer 2.

[0016] Electronic flow meters and one-way throttle valves are installed at the inlets of the low-density gas pipeline 8, medium-density gas pipeline 9, and high-density gas pipeline 7.

[0017] A gas sensor 14, a commercially available product, is installed at the mixed gas outlet 13. It is used to collect and output parameters such as pressure, temperature, composition, and flow rate of the mixed gas and transmit them to an external controller. Based on the information obtained, the external controller adjusts the flow rate of the one-way throttle valves at the inlets of the low-density gas pipeline 8, the medium-density gas pipeline 9, and the high-density gas pipeline 7 in real time, taking into account operating conditions and safety requirements.

[0018] This invention promotes the full heating of high-density and medium-density gas by the exhaust gas of the heating furnace through a multi-layered, complexly arranged arrangement of high-density and medium-density gas pipelines, thereby increasing the gas temperature, enhancing gas diffusion, and improving gas mixing.

[0019] This invention heats the bottom and lower sidewalls of the mixing chamber, which helps the high-density gas components deposited at the bottom of the mixing chamber to expand and rise, thereby achieving a better mixing effect and providing power for the upward movement of the gas.

[0020] This invention achieves convective collision mixing by staggered relative ejection of gas.

[0021] This invention improves the mixing effect by setting a porous medium in the funnel-shaped structure at the top of the mixing chamber, reducing the cross-sectional area, increasing the flow velocity of the mixed gas, enhancing the turbulence characteristics of the gas, promoting gas mixing, and further improving the mixing effect by disturbing the flow field through the porous medium.

[0022] This invention improves the problem of uneven mixing caused by the gas tending to pass between the porous medium and the wall surface. It sets multiple layers of porous medium at the top of the mixing chamber, with the porosity increasing from bottom to top. A small-porosity porous medium is set below the funnel-shaped high-porosity porous medium area at the top of the mixing chamber for premixing.

[0023] The present invention includes a gas sensor installed inside the mixed gas outlet pipeline, which is connected to an external controller.

[0024] The heat of the heating layer in this invention is provided by the exhaust gas of a high-temperature heating furnace. The exhaust gas enters the heating chamber through the exhaust gas inlet, heats the fuel pipeline, the bottom of the mixing chamber and the lower side wall, and is then discharged through the exhaust gas outlet. This eliminates the need to expend additional energy to heat the mixed gas and improve the blending effect, and also makes better use of the waste heat in the exhaust gas of the heating furnace.

[0025] The bottom of the mixing chamber of this invention is heated by the heating chamber. Combined with the jet characteristics of the gas distribution plate and the preheating of the gas fuel, it overcomes the stratification problem caused by the difference in gas density. It can realize the convective collision mixing and rising of multiple gases in the lower part of the mixing chamber, and further mixing under accelerated turbulent flow in the funnel-shaped porous medium at the top. The mixed gas with excellent uniformity is obtained by non-powered stirring and mixing. Attached Figure Description

[0026] Figure 1 This is a perspective view of the multi-element gas mixing device based on the utilization of waste heat from heating furnace exhaust gas according to the present invention.

[0027] Figure 2 This is a cross-sectional view of the multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas according to the present invention.

[0028] Figure 3 This is a structural diagram of the gas pipeline of the multi-element gas blending device based on the utilization of waste heat from the exhaust gas of the heating furnace according to the present invention.

[0029] Figure 4 This is a structural diagram of the jet disc of the multi-element gas mixing device based on the utilization of waste heat from the exhaust gas of the heating furnace according to the present invention.

[0030] In the diagram: 1-Shell; 2-Insulation layer; 3-Heating chamber; 4-Mixing chamber; 5-Exhaust gas inlet; 6-Exhaust gas outlet; 7-High-density gas pipeline; 71-High-density gas distribution plate; 8-Low-density gas pipeline; 81-Low-density gas distribution plate; 9-Medium-density gas pipeline; 91-Medium-density gas distribution plate; 10-Electronic flow meter; 11-One-way throttle valve; 12-Porous medium; 121-Small porosity porous medium; 122-Large porosity porous medium; 13-Mixed gas outlet; 14-Gas sensor. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present patent.

[0032] The gas sensor 14 used in this invention is a commercially available product. The model of the gas sensor 14 used in the embodiment is NND-8103LXY, which can measure temperature, pressure, composition, instantaneous flow rate, cumulative flow rate, etc.

[0033] Example 1

[0034] A multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas, such as Figure 1 , 2 As shown in Figures 3 and 4, the device includes a housing 1. Inside the housing 1, there is a heating chamber 3, a mixing chamber 4, and a funnel-shaped structure. The heating chamber 3 is a groove type, which wraps around the bottom and lower sidewall of the mixing chamber 4. The top of the mixing chamber 4 is provided with a funnel-shaped structure, and the top of the funnel-shaped structure is funnel-shaped and converges at 90 to 160 degrees.

[0035] The heating chamber 3 is hollow inside, and a through hole is opened at the bottom of the heating chamber 3. The low-density gas pipe 8 passes through the through hole. One end of the low-density gas pipe 8 is connected to the low-density gas source, and the other end is connected to the low-density gas distribution plate 81. The low-density gas distribution plate 81 is located at the bottom of the mixing chamber 4, and its axis coincides with the central axis of the mixing chamber 4. Several gas outlet holes I are provided on the low-density gas distribution plate 81. The gas outlet holes I are through holes that are 0 to 70° outward from the central axis of the mixing chamber 4.

[0036] A through hole is opened on the lower side of the heating chamber 3, through which a medium-density gas pipe 9 passes. One end of the medium-density gas pipe 9 is connected to a medium-density gas source, and the other end of the medium-density gas pipe 9 is a coil. The multi-layer coil is set inside the heating chamber 3. The outlet of the medium-density gas pipe 9 is connected to a medium-density gas distribution plate 91. The medium-density gas distribution plate 91 is set at the bottom of the mixing chamber 4, and its axis coincides with the central axis of the mixing chamber 4. Several gas outlet holes II are provided on the medium-density gas distribution plate 91. The gas outlet holes II are through holes pointing inward at 20-70° towards the central axis of the mixing chamber 4.

[0037] Above the through hole of the medium-density gas pipeline 9 on the side of the heating chamber 3, another through hole is provided. The high-density gas pipeline 7 passes through this through hole. One end of the high-density gas pipeline 7 is connected to a high-density gas source, and the other end of the high-density gas pipeline 7 is a coil. The multi-layer coil is set inside the heating chamber 3. The outlet of the high-density gas pipeline 7 is connected to a high-density gas distribution plate 71, which is set on the side wall of the mixing chamber 4. Its axis coincides with the central axis of the mixing chamber. Several gas outlet holes III are provided on the high-density gas distribution plate 71. The gas outlet holes III are through holes with a horizontal included angle of -80 to 80° pointing inward toward the central axis of the mixing chamber 4.

[0038] The outer diameter of the medium-density gas distribution plate 91 is smaller than the inner diameter of the mixing chamber 4, and the outer diameter of the low-density gas distribution plate 81 is smaller than the inner diameter of the medium-density gas distribution plate 91.

[0039] A tail gas inlet 5 is provided at the bottom of the heating chamber 3, and the tail gas inlet 5 is hollowly connected to the interior of the heating chamber 3. A tail gas outlet 6 is provided on the top side of the heating chamber 3.

[0040] A porous medium 12 is provided in the upper part of the mixing chamber 4 and the funnel-shaped structure at its top. The porous medium 12 has smaller pores and larger pores from bottom to top. The porous medium 12 includes a lower layer of small porosity porous medium 121 with a porosity of 20 to 50% and an upper layer of large porosity porous medium 122 with a porosity of 50 to 80%.

[0041] The top of the funnel-shaped structure is equipped with a mixed gas outlet 13. A gas sensor 14 is installed at the mixed gas outlet 13. This sensor is a commercially available product and is used to collect and output parameters such as pressure, temperature, composition and flow rate of the mixed gas. The sensor is then transmitted to an external control computer. Based on the information obtained, the external control computer adjusts the flow rate of the one-way throttle valves at the inlets of the low-density gas pipeline 8, the medium-density gas pipeline 9 and the high-density gas pipeline 7 in real time, taking into account the operating conditions and safety requirements.

[0042] Heating chamber 3, mixing chamber 4, and the outer wall of the funnel-shaped structure are wrapped with a heat insulation layer 2;

[0043] Except for the pipe interface, the heating chamber 3 is a closed hollow structure. The mixing chamber 4 has no top surface, and the porous medium 12 forms the top surface. The overlapping surface of the mixing chamber 4 and the heating chamber 3 is a common surface, that is, the bottom surface of the mixing chamber 4 is the top surface of the heating chamber 3. The overlapping side surface of the mixing chamber 4 and the heating chamber 3 is a common surface. The mixing chamber 4 and the heating chamber 3 share the bottom surface and part of the side surface. The common surface is made of metal material with good thermal conductivity and can be used as a heat transfer wall to further heat the mixing chamber 4. The upper part of the mixing chamber 4 is not sealed and is equipped with the porous medium 12.

[0044] Example 2

[0045] The blending device of Example 1 is used to blend ammonia-hydrogen-natural gas. Ammonia has the highest density among the components and is transported through high-density gas pipeline 7. Natural gas has a medium density and is transported through medium-density gas pipeline 9. Hydrogen has the lowest density and is transported through low-density gas pipeline 8. The fuel ratio is set on an external control computer to control the input of each gas component according to the specific working conditions. Feedback and control are provided through electronic flow meters and one-way throttle valves in each pipeline.

[0046] The exhaust gas from the high-temperature heating furnace enters the heating chamber 3 through the exhaust gas inlet 5. During the flow of the high-temperature exhaust gas, it heats the gas fuel in the high-density gas pipeline 7, the low-density gas pipeline 8, and the medium-density gas pipeline 9, as well as the bottom and lower side wall of the mixing chamber 4. Finally, it is discharged from the exhaust gas outlet 6 on the upper side wall of the heating chamber 3.

[0047] The exhaust gas from the high-temperature heating furnace also heats the bottom and lower sidewalls of the mixing chamber 4. This helps the high-density gas components deposited at the bottom of the mixing chamber 4 to expand and rise due to the heat, achieving a better mixing effect. Heating provides power for the upward movement of the gas. The insulation layer 2 can reduce heat loss, increase the gas mixing temperature, strengthen the gas diffusion movement, and increase the gas mixing rate.

[0048] An electronic flow meter at the inlet of the low-density gas pipeline 8 detects the hydrogen flow rate. A one-way throttle valve controls the direction and flow rate of the gas. The low-density gas pipeline 8 vertically passes through the bottom center of the heating chamber 3 and connects to the bottom of the mixing chamber 4. Hydrogen is ejected radially upward and radially horizontally away from the central axis of the mixing chamber 4 through the low-density gas distribution plate 81. Since hydrogen has the lowest density compared to ammonia and natural gas, it has a spontaneous upward tendency when the three gases are mixed. Hydrogen is ejected through the low-density gas distribution plate 81, which has an outer diameter of 67% of the inner diameter of the bottom of the mixing chamber 4 and has 12 radial jet holes and 18 45° radial outward jet holes away from the central axis of the mixing chamber 4. Combined with the heating effect at the bottom of the mixing chamber 4, it can provide the spontaneous upward mixing power for the gas mixture.

[0049] At the inlet of the medium-density gas pipeline 9, an electronic flow meter 10 detects the natural gas flow rate, and a one-way throttle valve 11 controls the gas inflow direction and flow rate. The medium-density gas pipeline 9 is distributed in two layers, with eight interlaced turns in the heating chamber 3, before entering the mixing chamber 4. Natural gas is ejected radially upwards towards the central axis of the mixing chamber 4 through a semi-circular tubular medium-density gas distribution plate 91, which has an outer diameter of 89% of the inner diameter of the bottom of the mixing chamber 4 and is equipped with 36 jet holes at 45° radially inwards pointing towards the central axis of the mixing chamber 4. Combined with the heating effect at the bottom of the mixing chamber 4, it can provide sufficient power for the natural gas to disturb the flow field and convective collisions radially upwards towards the axis, so as to achieve more effective and uniform mixing.

[0050] At the inlet of the high-density gas pipeline 7, an electronic flow meter detects the ammonia flow rate. A one-way throttle valve controls the direction and flow rate of the gas. The high-density gas pipeline 7 enters the mixing chamber 4 after passing through three layers of large-diameter single-loop gas in the heating chamber 3. Ammonia is ejected through the high-density gas distribution plate 71, which is located at 1 / 5 of the height of the mixing chamber 4. The high-density gas distribution plate 71 has 30 horizontal radial through holes pointing inward toward the central axis of the mixing chamber 4. Since ammonia has the highest density compared to hydrogen and natural gas, it is relatively underheated. After being injected into the mixing chamber 4, ammonia has a tendency to settle. After initial mixing with the rising hydrogen and natural gas below, it rises under the heating at the bottom of the mixing chamber 4 and the support of the hydrogen and natural gas.

[0051] After hydrogen, natural gas, and ammonia undergo a single convective collision mixing, the gas rises into the upper porous medium 12 region of the mixing chamber 4. It flows through the small-porosity porous medium 121 with a porosity of 20-50%, achieving initial turbulence mixing. This improves the problem of uneven mixing caused by the gas tending to pass between the porous medium 12 and the wall. Subsequently, it flows through the 50-80% large-porosity porous medium 122 filled in the 146° funnel-shaped converging region at the top of the mixing chamber 4. The secondary mixing is achieved by increasing the gas flow velocity to enhance turbulence characteristics and by the relatively large-porosity porous medium 122 disturbing the flow field.

[0052] The mixed gas flowing out from the porous medium 12 flows out through the mixed gas outlet 13. A gas sensor 14 is installed in the mixed gas outlet 13 pipe to monitor the pressure, temperature, composition and flow rate of the output mixed gas and transmit the information to an external control computer. Based on the information obtained, combined with the operating conditions and safety requirements, the external control computer adjusts the flow rate in real time at the one-way throttle valves installed at the inlets of the low-density gas pipeline 8, medium-density gas pipeline 9 and high-density gas pipeline 7. At the same time, the electronic flow meter at the inlet monitors the flow rate and feeds back the monitoring data to the control computer, which stores the data.

[0053] Example 3

[0054] When the blending device of Example 1 is used to blend gas, and the required blended gas is a two-component gas, a combination of high-density gas pipeline 7 + low-density gas pipeline 8 or medium-density gas pipeline 9 + low-density gas pipeline 8 can be used.

[0055] When the required gas components are three or more, multiple blending units can be used in series.

[0056] Choose the pipeline based on the actual situation.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas, characterized in that, Includes a shell (1), inside which are provided a heating chamber (3), a mixing chamber (4), and a funnel-shaped structure. The heating chamber (3) covers the bottom and lower sidewall of the mixing chamber (4), and the top of the mixing chamber (4) is provided with a funnel-shaped structure. The heating chamber (3) is hollow inside. A through hole is opened at the bottom of the heating chamber (3). A low-density gas pipeline (8) passes through the through hole. One end of the low-density gas pipeline (8) is connected to a low-density gas source, and the other end is connected to a low-density gas distribution plate (81). The low-density gas distribution plate (81) is located at the bottom of the mixing chamber (4). The central axis of the low-density gas distribution plate (81) coincides with the central axis of the mixing chamber (4). Several gas outlet holes I are provided on the low-density gas distribution plate (81). A through hole is opened on the lower side of the heating chamber (3), and a medium-density gas pipe (9) passes through the through hole. One end of the medium-density gas pipe (9) is connected to a medium-density gas source, and the other end of the medium-density gas pipe (9) is a coil, which is set inside the heating chamber (3). The outlet of the medium-density gas pipe (9) is connected to a medium-density gas distribution plate (91). The medium-density gas distribution plate (91) is set at the bottom of the mixing chamber (4). The central axis of the medium-density gas distribution plate (91) coincides with the central axis of the mixing chamber (4). Several gas outlet holes II are set on the medium-density gas distribution plate (91). Another through hole is provided above the through hole of the medium density gas pipe (9) on the side of the heating chamber (3). The high density gas pipe (7) passes through this through hole. One end of the high density gas pipe (7) is connected to the high density gas source. The other end of the high density gas pipe (7) is a coil and is set inside the heating chamber (3). The outlet of the high density gas pipe (7) is connected to the high density gas distribution plate (71). The high density gas distribution plate (71) is set on the side wall of the mixing chamber (4). The central axis of the high density gas distribution plate (71) coincides with the central axis of the mixing chamber (4). Several gas outlet holes III are set on the high density gas distribution plate (71). A tail gas inlet (5) is provided at the bottom of the heating chamber (3), and the tail gas inlet (5) is hollowly connected to the interior of the heating chamber (3). A tail gas outlet (6) is provided on the top side of the heating chamber (3). A mixed gas outlet (13) is provided at the top of the funnel-shaped structure.

2. The multi-element gas blending device based on the utilization of waste heat from heating furnace tail gas according to claim 1, characterized in that, The air outlet I is a through hole that is 0 to 70° outward away from the central axis of the mixing chamber (4); the air outlet II is a through hole that is 20 to 70° inward pointing towards the central axis of the mixing chamber (4); and the air outlet III is a through hole that is 80 to 80° inward pointing towards the central axis of the mixing chamber (4).

3. The multi-element gas blending device based on the utilization of waste heat from heating furnace tail gas according to claim 1, characterized in that, The outer diameter of the medium-density gas distribution plate (91) is smaller than the inner diameter of the mixing chamber (4), and the outer diameter of the low-density gas distribution plate (81) is smaller than the inner diameter of the medium-density gas distribution plate (91).

4. The multi-element gas blending device based on the utilization of waste heat from heating furnace tail gas according to claim 1, characterized in that, Porous media (12) are provided in the upper part and the funnel-shaped structure at the top of the mixing chamber (4).

5. The multi-element gas blending device based on the utilization of waste heat from heating furnace exhaust gas according to claim 4, characterized in that, The porosity of the porous medium (12) increases from bottom to top.

6. The multi-element gas blending device based on the utilization of waste heat from heating furnace tail gas according to claim 1, characterized in that, The heating chamber (3), the mixing chamber (4), and the funnel-shaped structure are covered with a heat insulation layer (2).

7. The multi-element gas blending device based on the utilization of waste heat from heating furnace tail gas according to claim 1, characterized in that, Electronic flow meters and one-way throttle valves are installed at the inlets of the low-density gas pipeline (8), medium-density gas pipeline (9), and high-density gas pipeline (7).

8. The multi-element gas blending device based on the utilization of waste heat from heating furnace tail gas according to claim 1, characterized in that, A gas sensor (14) is installed at the gas outlet (13).

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