Device and method for treating fly ash through natural gas high-temperature melting

Abstract

The invention discloses a device and method for treating fly ash through natural gas high-temperature melting, and relates to the field of fly ash high-temperature melting treatment.The device comprises a melting furnace, a smoke settling and discharging port is formed in one side of the melting furnace, feeding ports are formed in the top and a middle tower section of the melting furnace, and a feeding mechanism is arranged on the top side of the melting furnace; a tower section and a molten pool part of the melting furnace are provided with a plurality of natural gas combustors, a preheating section and a melting section are sequentially arranged in the melting furnace from top to bottom, fly ash is molten in the melting furnace to form molten glass and high-temperature flue gas, the temperature in the high-temperature melting process is stabilized to be 1200 DEG C or above, and the molten glass and the high-temperature flue gas are separated from each other. Therefore, dioxin toxic substances in the fly ash are thoroughly decomposed, and heavy metal toxic substances such as lead and the like can be sealed in the vitreous slag. Harmless and resource utilization of the fly ash is achieved, the problem that resource treatment of the fly ash is difficult is solved, meanwhile, energy consumption in the fly ash treatment process is reduced, and high-mixing-amount and centralized treatment of the fly ash is achieved.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature melting treatment of fly ash, and in particular to a device and method for high-temperature melting of natural gas to treat fly ash. Background Art

[0002] According to the National List of Hazardous Wastes, fly ash is classified as hazardous waste, under the HW18 category, code: 772-002-18. Its primary components are calcium oxide and silicon dioxide, accounting for approximately 65% of its total mass, with soluble chloride salts making up approximately 35% of the total mass. Currently, the mainstream disposal method for fly ash in China is landfill, where heavy metals are solidified and stabilized before being sent to landfill.

[0003] High-temperature fly ash melting involves completely melting the fly ash at high temperatures, followed by rapid cooling, such as through water quenching, to form a dense glassy product. This process utilizes high temperatures to degrade organic pollutants in the fly ash and stabilize heavy metals within a dense ceramic and glassy structure. Silica forms a glassy network structure of [SiO₄] tetrahedrons. Depending on the charge, coordination number, and cation size of the heavy metal ions, the silica is distributed within the glassy structure as either network exosomes or network intermediates, thereby inhibiting heavy metal leaching. The increased density alone after fly ash melting can reduce volume by over 70%, and the resulting glassy product meets hazardous waste toxicity leaching standards, achieving volume reduction, toxicity reduction, and resource utilization. After melting, the fly ash significantly reduces its volume by 50%-70% and its weight by 15%-40%, significantly reducing dioxin release. The glassy product formed after cooling after melting can be effectively utilized as a building material.

[0004] However, existing high-temperature fly ash melting processes suffer from high energy consumption and costs. For example, the high melting point of plasma melting makes industrial application and promotion difficult. Furthermore, low-temperature heat treatment of fly ash can result in incomplete detoxification. Recycling hazardous wastes like fly ash to avoid secondary pollution and the waste of land resources caused by landfills is an urgent issue. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a device and method for high-temperature melting of natural gas to dispose of fly ash, realize the harmlessness and resource utilization of fly ash, solve the problem of difficult resource disposal of fly ash, and at the same time reduce the energy consumption in the fly ash disposal process. Compared with non-oxygen-enriched combustion, it has the advantages of lower cost and smaller flue gas volume. In addition, the fly ash incorporation ratio can reach more than 60% during the treatment process, realizing high-dosage and centralized disposal of fly ash.

[0006] The object of the present invention is achieved through the following technical solution: a device for high-temperature melting of natural gas to dispose of fly ash, comprising:

[0007] The melting furnace includes a reaction tower, which is sequentially provided with a top tower section, a middle tower section, and a bottom tower section from top to bottom. A top feed inlet is provided on the top tower section for connecting to an external feed system to introduce fly ash granulation materials into the top tower section. The materials are preheated through the middle tower section and then enter the bottom tower section.

[0008] A molten pool is arranged below the reaction tower. A boss is provided in the molten pool opposite to the bottom tower section for a small amount of accumulation of the materials. An opening is provided on the side wall of the molten pool for installing a melting burner. The melting burner faces upward above the boss and is used to introduce preheated air and natural gas to melt the materials. A slag discharge port is opened on one side of the side wall of the molten pool away from the melting burner for discharging the molten glass liquid; and

[0009] A flue gas treatment system is arranged above one side of the molten pool close to the slag discharge port. The flue gas treatment system includes a flue gas separation and sedimentation device communicated with the molten pool, which is used to separate the molten glass droplets in the high-temperature flue gas. The separated flue gas leads to a high-temperature heat exchanger through a flue gas connection section for flue gas treatment.

[0010] As a further technical solution, a tower section middle burner is installed on the middle tower section for preheating the materials; a tail burner is arranged at the molten pool close to the flue gas separation and sedimentation device for assisting the flow of the molten glass liquid; a tower section feed inlet and a tower section bottom burner are provided on the bottom tower section.

[0011] As a further technical solution, air inlets and natural gas inlets are provided on the tower section middle burner, the tower section bottom burner, the melting burner, and the tail burner for correspondingly introducing preheated air and natural gas, so that the preheated air and natural gas are fully mixed, and the gas flow is controlled by adjusting the hand valve; the preheated air is formed by heating the air supplied by a Roots blower through a air supply pipeline into a hot air electric heating device.

[0012] As a further technical solution, the top tower section adopts a slope structure, and a top explosion relief port, a top pressure measurement port, and a top temperature measurement port are sequentially arranged on the side wall of the top tower section.

[0013] As a further technical solution, an observation port and a temperature measurement port are provided on the side wall of the molten pool. An observation sight glass is installed at the observation port for observing the melting condition of the materials in the molten pool. An infrared temperature detection device is installed at the temperature measurement port for detecting and displaying the real-time temperature in the molten pool. The infrared temperature detection device is communicatively connected to a remote control terminal for sending the real-time temperature; the observation port and the temperature measurement port are both arranged between the bottom tower section and the boss; support feet are arranged at the bottom of the molten pool, and the reaction tower is supported by a tower section support steel frame.

[0014] As a further technical solution, an induced draft fan is provided at the tail end of the flue gas treatment system, and the flue gas is filtered by a high-temperature heat exchanger and then discharged through a discharge device.

[0015] A method for treating fly ash by high-temperature melting of natural gas, using the device for treating fly ash by high-temperature melting of natural gas as described above, includes the following steps:

[0016] S1. Mix the fly ash with a flux and place it in a mixing and stirring machine for uniform stirring, and then send it into a granulating and forming machine to form granules;

[0017] S2. Convey the granular material made in S1 to the tower section feed port or the top feed port of the melting furnace through a feeding system for feeding. Heat the air through a hot wind electric heater to form preheated air, and then introduce the preheated air into the corresponding burner to mix and burn with natural gas to increase the temperature in the melting furnace;

[0018] S3. The material conveyed to the melting furnace falls onto the convex platform, and the material above the convex platform is melted by a melting burner. The molten glass liquid generated is discharged from the slag discharge port, and at the same time, the generated flue gas enters the flue gas treatment system to realize flue gas treatment and discharge.

[0019] As a further technical solution, in S1, the flux is soda ash, silica fume, and borax, and the weight ratio of fly ash to soda ash, silica fume, and borax is 6:2:1:1.

[0020] As a further technical solution, in S2, the air is heated to 200 °C by a hot wind electric heater, and the melting temperature range in the melting furnace is controlled between 1200 °C and 1400 °C. The operator obtains the real-time temperature in the molten pool through an infrared temperature detection device. When the detected temperature is higher or lower than the melting temperature range, the feeding speed is changed or the natural gas intake is adjusted so that the temperature in the molten pool is always within the fly ash melting temperature range; in S2, when performing a test feeding, the material particles are put into the tower section feed port, and the melting situation of the material is observed through the observation port.

[0021] As a further technical solution, in S3, the flue gas first passes through a flue gas separation and sedimentation device to separate the molten glass droplets in the high-temperature flue gas, and the molten glass droplets flow back into the molten pool; under the action of the induced draft fan, a negative pressure state is maintained in the melting furnace to ensure that the flue gas reaches the high-temperature heat exchanger along the flue gas connection section for flue gas treatment.

[0022] The beneficial effects of the present invention are:

[0023] 1. Granulation is carried out using fly ash and flux. Since fly ash is relatively light in weight, powdered fly ash is likely to be carried out by the outlet flue gas when entering the furnace through pneumatic conveying, so that the fly ash cannot completely fall into the melting pool for melting. At the same time, it increases the burden on the subsequent flue gas treatment process. The granulation method of fly ash improves the stability of fly ash, and at the same time, with the addition of flux, it reduces the melting temperature of fly ash.

[0024] 2. Under the fully mixed combustion atmosphere of natural gas and air, using air as the combustion aid reduces the cost and flue gas volume compared with the oxygen-enriched condition. Preheating the air and then mixing it with natural gas to ignite also increases the temperature of the combustion flame. Introducing heated air helps to increase the temperature in the melting pool, which can be stably maintained at up to 1200°C to 1400°C, enabling thorough and harmless treatment of fly ash, improving the melting efficiency, and enhancing the economy.

[0025] 3. The molten glass liquid produced by melting can be collected and utilized subsequently. For example, it can be directly water-quenched into small granular glass bodies for use in building materials, or it can directly enter the cotton-making equipment in combination with the wire-drawing process, realizing the resource utilization of fly ash and turning waste into treasure, saving the land resource waste and secondary pollution problems caused by the landfill of fly ash, and indirectly reducing the operating cost at the same time. Description of the Drawings

[0026] Figure 1 It is a schematic flow chart of Embodiment 2 in the present invention.

[0027] Figure 2 It is a front view structural schematic diagram of Embodiment 1 in the present invention.

[0028] Figure 3 It is a side view structural schematic diagram of Embodiment 1 in the present invention.

[0029] Figure 4 It is a sectional view structural schematic diagram of the melting pool in the present invention.

[0030] Figure 5 It is a structural schematic diagram of the burner in the present invention.

[0031] Figure 6 It is a schematic diagram of the furnace heating-up curve of the melting furnace in Embodiment 2 of the present invention.

[0032] Description of the reference numerals: top tower section 1, tower section support steel frame 2, tower section middle burner 3, middle tower section 4, bottom tower section 5, tower section bottom burner 6, melting burner 7, melting pool 8, support foot 9, boss 10, slag outlet 11, tail burner 12, flue gas separation and sedimentation device 13, flue gas connection section 14, high-temperature heat exchanger 15, top feed port 16, tower section feed port 17, observation port 18, temperature measurement port 19, top explosion vent 20, top pressure measurement port 21, top temperature measurement port 22, air inlet 23, natural gas inlet 24. Detailed implementation mode

[0033] The present invention will be described in detail below with reference to the accompanying drawings:

[0034] Example 1: As shown in the accompanying drawings, a device for high-temperature melting treatment of fly ash with natural gas includes a top tower section 1, a tower section support steel frame 2, a tower section middle burner 3, a middle tower section 4, a bottom tower section 5, a tower section bottom burner 6, a melting burner 7, a melting pool 8, support feet 9, a boss 10, a slag discharge port 11, a tail burner 12, a flue gas separation and settlement device 13, a flue gas connection section 14, a high-temperature heat exchanger 15, a top feed port 16, a tower section feed port 17, an observation port 18, a temperature measurement port 19, a top tower explosion vent 20, a top tower pressure measurement port 21, a top tower temperature measurement port 22, an air inlet 23, a natural gas inlet 24, and a melting furnace.

[0035] Refer to the attached Figure 2 , 3 , the melting furnace includes a reaction tower, and the reaction tower is sequentially provided with a top tower section 1, a middle tower section 4, and a bottom tower section 5 (the three are connected in sequence) from top to bottom. A top feed port 16 is provided on the top tower section 1, which can be connected to an external feeding system to introduce fly ash granulated materials into the top tower section 1, preheat the materials through the middle tower section 4, and then enter the bottom tower section 5. Further, a tower section middle burner 3 is installed on the middle tower section 4, which can preheat the materials.

[0036] A melting pool 8 is arranged below the reaction tower (melting furnace). A boss 10 is arranged in the melting pool 8 opposite to the bottom tower section 5, which can be used for a small amount of material accumulation (the fly ash granulated materials in the melting section of the melting pool fall onto the boss 10). An opening is made on the side wall of the melting pool 8 and a melting burner 7 is installed. The melting burner 7 faces upward above the boss 10, and can introduce preheated air and natural gas to melt the materials. A slag discharge port 11 is opened on one side of the side wall of the melting pool 8 away from the melting burner 7, through which the molten glass liquid can be discharged.

[0037] Preferably, an observation port 18 and a temperature measurement port 19 are provided on the side wall of the melting pool 8. An observation sight glass is installed at the observation port 18, and the melting situation of the materials in the melting pool 8 can be observed by using the observation sight glass. An infrared temperature detection device is installed at the temperature measurement port 19, and the infrared temperature detection device can detect and display the real-time temperature in the melting pool 8. In addition, the infrared temperature detection device is also communicatively connected to a remote control terminal and can send the real-time temperature, so as to facilitate the operator to timely know the actual temperature in the melting pool 8 and adjust in time when the detected temperature is higher or lower than the melting temperature range, such as changing the feeding speed or adjusting the natural gas flow rate, so that the temperature in the melting pool 8 is always within the fly ash melting temperature range. The observation port 18 and the temperature measurement port 19 are both arranged between the bottom tower section 5 and the boss 10, which is convenient for observation and temperature measurement. Support feet 9 are arranged at the bottom of the melting pool 8, and the reaction tower is supported by a tower section support steel frame 2.

[0038] Further, a flue gas treatment system is arranged above the side of the molten pool 8 close to the slag discharge port 11. The flue gas treatment system includes a flue gas separation and sedimentation device 13 communicated with the molten pool 8. The flue gas separation and sedimentation device 13 can separate the molten glass droplets in the high-temperature flue gas. The separated flue gas leads to a high-temperature heat exchanger 15 through a flue gas connection section 14 for flue gas treatment.

[0039] An induced draft fan is arranged at the tail end of the flue gas treatment system (high-temperature heat exchanger 15), which can keep the fly ash melting system operating in a slightly negative pressure state, ensure that the flue gas of the system flows along the flue to the flue gas treatment system, reduce the gas leakage around the reaction tower and the molten pool. The flue gas is discharged through a discharge device after being filtered by the high-temperature heat exchanger 15. The discharge device can be a chimney or other flue gas discharge equipment. The high-temperature flue gas enters the discharge device of the flue gas treatment system to absorb waste heat, remove acid and dust for harmless discharge.

[0040] Further, as Figure 2 shown, a tail burner 12 is arranged at the molten pool 8 close to the flue gas separation and sedimentation device 13, which can assist the flow of molten glass liquid. The molten glass liquid passes through the slag discharge port 11 to the collection device for air cooling or water quenching to finally form glass bodies, realizing the recycling of resources. A tower section feed port 17 and a tower section bottom burner 6 are arranged on the bottom tower section 5.

[0041] An air inlet 23 and a natural gas inlet 24 are arranged on each of the burners, namely the tower section middle burner 3, the tower section bottom burner 6, the melting burner 7 and the tail burner 12. As Figure 5 shown, preheated air and natural gas can be correspondingly introduced, so that the preheated air and natural gas are fully mixed, and the gas flow rate is controlled by adjusting the hand valve. The preheated air is formed by heating the air supplied by a Roots blower through a air supply pipeline in a hot wind electric heating device. The set electric heating temperature is 200 °C, and then the air is introduced into the air inlet 23 of the burner. Preferably, the gas inlet of the burner is connected to the air duct and the natural gas pipeline through a hose, the gas flow rate is controlled by adjusting the hand valve, and after premixing in front of the burner nozzle, it is ignited and inserted into the burner installation flange.

[0042] As a preferred technical solution, the reaction tower tower section adopts a steel plate welded shell, and refractory castable and insulating bricks are poured inside. The melting furnace adopts a steel shell, is insulated with asbestos outside, and is lined with refractory castable and refractory bricks inside to reduce heat dissipation to the outside. Further, the top tower section 1 adopts a slope structure, and a top explosion relief port 20, a top pressure measuring port 21 and a top temperature measuring port 22 are sequentially arranged on the side wall of the top tower section 1. The reaction tower is also provided with thermocouples and pressure sensors, which can obtain the top pressure and temperature, facilitate pressure relief, observe the temperature of the preheating section of the reaction tower, and understand the preheating situation.

[0043] Example 2: A method for treating fly ash by high-temperature melting of natural gas, using the device for treating fly ash by high-temperature melting of natural gas in Example 1, includes the following steps:

[0044] S1. Mix the fly ash with fluxes (soda ash, silica fume, borax) and place them in a mixing blender for uniform stirring. The weight ratio of the fly ash to soda ash, silica fume, and borax is 6:2:1:1. Then, send them into a granulation and forming machine to make granules. Preferably, the melting temperature range of the granulated material after compatibility and forming is controlled at about 1200°C.

[0045] S2. Convey the granulated material made in S1 to the tower section feed port 17 or the top feed port 16 of the melting furnace through a feeding system for feeding. The feeding speed of the material is 124.5 kg / h, and the fly ash ratio can reach 65% (converted to fly ash: 80.9 kg / h). The natural gas consumption is 21.5 Nm3 / h.

[0046] Heat the air supplied by the roots blower to 200°C through a hot air and electric heater to form preheated air. Then, introduce the preheated air into the corresponding burner to mix and burn with natural gas to increase the temperature in the melting furnace. Preferably, in the early stage of the melting furnace, it is necessary to heat up according to the furnace drying curve in time periods. At the beginning of furnace drying, the flame temperature should be small, and first use a small flow of gas for operation, and heat up according to the Figure 6 shown heating curve.

[0047] Furthermore, the melting temperature range in the melting furnace is controlled between 1200°C and 1400°C. The operator obtains the real-time temperature in the molten pool 8 through an infrared temperature detection device. When the detected temperature is higher or lower than the melting temperature range, change the feeding speed or adjust the natural gas intake volume so that the temperature in the molten pool 8 is always within the fly ash melting temperature range.

[0048] In addition, during the experimental feeding, put the material particles into the tower section feed port 17, and observe the melting situation of the material through the observation port 18, so as to understand the melting situation of the material in advance and avoid the blockage phenomenon when feeding in a large scale at the top. During the operation process, the molten glass liquid in the molten pool needs to form a liquid level of about 10 cm, so as to increase the heat radiation intensity in the molten pool, thereby increasing the temperature of the molten pool and the temperature of the flue gas at the rear end, which is convenient for discharging the slag of the material.

[0049] S3. The materials conveyed to the melting furnace fall onto the boss 10, and the materials above the boss 10 are melted by the melting burner 7. The generated molten glass liquid is discharged from the slag discharge port 11, and at the same time, the generated flue gas enters the flue gas treatment system to realize flue gas treatment and emission. The flue gas first passes through the flue gas separation and sedimentation device 13 to separate the molten glass droplets in the high-temperature flue gas, so that the molten glass droplets flow back into the molten pool 8, avoiding the entry of high-temperature molten glass liquid into the flue gas disposal system; under the action of the induced draft fan, a negative pressure state is maintained in the melting furnace to ensure that the flue gas reaches the high-temperature heat exchanger 15 along the flue gas connection section 14 for flue gas treatment.

[0050] It can be understood that for those skilled in the art, equivalent substitution or change of the technical solution and inventive concept of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. An apparatus for high-temperature melting treatment of fly ash from natural gas, characterized in that, Comprising: A melting furnace, including a reaction tower. The reaction tower is successively provided with a top tower section (1), a middle tower section (4), and a bottom tower section (5) from top to bottom. A top feed inlet (16) is provided on the top tower section (1) for connecting to an external feed system to introduce fly ash granulation material into the top tower section (1). The material is preheated through the middle tower section (4) and then enters the bottom tower section (5). A molten pool (8) is arranged below the reaction tower. A boss (10) is provided in the molten pool (8) opposite to the bottom tower section (5) for a small amount of accumulation of the material. An opening is provided on the side wall of the molten pool (8) for installing a melting burner (7). The melting burner (7) faces upward above the boss (10) for introducing preheated air and natural gas to melt the material. A slag discharge port (11) is opened on one side of the side wall of the molten pool (8) away from the melting burner (7) for discharging molten glass liquid. And A flue gas treatment system is arranged above the side of the molten pool (8) near the slag discharge port (11). The flue gas treatment system includes a flue gas separation and sedimentation device (13) communicated with the molten pool (8) for separating molten glass droplets in high-temperature flue gas. The separated flue gas leads to a high-temperature heat exchanger (15) through a flue gas connection section (14) for flue gas treatment.

2. The device for high-temperature melting treatment of fly ash from natural gas according to claim 1, wherein: A tower section middle burner (3) is installed on the middle tower section (4) for preheating the material; a tail burner (12) is arranged near the flue gas separation and sedimentation device (13) of the molten pool (8) for assisting the flow of molten glass liquid; a tower section feed inlet (17) and a tower section bottom burner (6) are provided on the bottom tower section (5).

3. The device for high-temperature melting treatment of fly ash by natural gas according to claim 2, characterized in that: Air inlets (23) and natural gas inlets (24) are provided on the tower section middle burner (3), the tower section bottom burner (6), the melting burner (7), and the tail burner (12) for correspondingly introducing preheated air and natural gas, so that the preheated air and natural gas are fully mixed, and the gas flow is controlled by adjusting a manual valve; the preheated air is formed by heating the air supplied by a Roots blower through a blast air pipeline in a hot wind electric heating device.

4. The device for disposing fly ash by high-temperature melting of natural gas according to claim 1, characterized in that: The top tower section (1) adopts a slope structure, and a top explosion relief port (20), a top pressure measurement port (21), and a top temperature measurement port (22) are successively arranged on the side wall of the top tower section (1).

5. The device for high-temperature melting treatment of fly ash by natural gas according to claim 1, characterized in that: Observation ports (18) and temperature measurement ports (19) are provided on the side wall of the molten pool (8). An observation sight glass is installed at the observation port (18) for observing the melting condition of the material in the molten pool (8). An infrared temperature detection device is installed at the temperature measurement port (19) for detecting and displaying the real-time temperature in the molten pool (8). The infrared temperature detection device is communicatively connected to a remote control terminal for sending the real-time temperature; both the observation port (18) and the temperature measurement port (19) are arranged between the bottom tower section (5) and the boss (10); support feet (9) are arranged at the bottom of the molten pool (8), and the reaction tower is supported by a tower section support steel frame (2).

6. The device for high-temperature melting treatment of fly ash by natural gas according to claim 1, characterized in that: An induced draft fan is arranged at the tail end of the flue gas treatment system, and the flue gas is discharged through an emission device after being filtered by the high-temperature heat exchanger (15).

7. A method for treating fly ash by high-temperature melting of natural gas, using the device for treating fly ash by high-temperature melting of natural gas according to claims 1 to 6, characterized in that, Including the following steps: S1. Mix the fly ash with the flux and place them in a mixing blender for uniform stirring, and then send them into a granulation molding machine to make granules. S2. Convey the granular material made in S1 to the tower section feed port (17) or the top feed port (16) of the melting furnace through a feeding system for feeding. Heat the air through a hot wind electric heater to form preheated air, and then introduce the preheated air into the corresponding burner to mix and burn with natural gas to increase the temperature in the melting furnace. S3. The material conveyed to the melting furnace drops onto the boss (10), and the material above the boss (10) is melted by the melting burner (7). The generated molten glass liquid is discharged from the slag outlet (11), and at the same time, the generated flue gas enters the flue gas treatment system to realize flue gas treatment and emission.

8. The method for treating fly ash by high-temperature melting of natural gas according to claim 7, characterized in that: In S1, the flux is soda ash, silica fume, and borax, and the weight ratio of fly ash to soda ash, silica fume, and borax is 6:2:1:

1.

9. The method for treating fly ash by high-temperature melting of natural gas according to claim 7, characterized in that: In S2, the air is heated to 200 °C through a hot wind electric heater, and the melting temperature range in the melting furnace is controlled between 1200 °C and 1400 °C. The operator obtains the real-time temperature in the molten pool (8) through an infrared temperature detection device. When the detected temperature is higher or lower than the melting temperature range, change the feeding speed or adjust the natural gas intake to make the temperature in the molten pool (8) always within the fly ash melting temperature range; in S2, when conducting a pilot feeding, the material particles are put in from the tower section feed port (17), and the melting situation of the material is observed through the observation port (18).

10. The method for treating fly ash by high-temperature melting of natural gas according to claim 7, characterized in that: In S3, the flue gas first passes through the flue gas separation and sedimentation device (13) to separate the molten glass droplets in the high-temperature flue gas, and the molten glass droplets flow back into the molten pool (8); under the action of the induced draft fan, a negative pressure state is maintained in the melting furnace to ensure that the flue gas reaches the high-temperature heat exchanger (15) along the flue gas connection section (14) for flue gas treatment.

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