Heat energy recovery device

Abstract

The invention discloses a heat energy recovery device for a gasification device. The heat energy recovery device comprises a gas collecting hood, a gas return pipe and a first gas flow multiplier, and the gas-collecting hood covers a gap between the furnace tube of the gasification device and the discharge tube. The gas return pipe is connected with the gas-collecting hood. The first gas flow multiplier is connected with one end, opposite to the gas collecting hood, of the gas return pipe and is annularly arranged on a feeding pipe of the gasification device. When the gasification device gasifies the treated object, internal gas is generated after the treated object is gasified, and the internal gas flows from a gap between the furnace tube and the discharge tube. Flowing internal gas is recycled into the feeding pipe through the gas collecting hood, the gas return pipe and the first gas flow multiplier. Therefore, the heat energy recovery device can collect the dissipated waste heat of the gasification device, and heat energy is used for heating and drying the processed object fed into the gasification device.

Description

Technical Field

[0001] The invention relates to a heat recovery device, in particular to a heat recovery device for a gasification device, which is used to collect the dissipated waste heat of the gasification device and use the heat energy to heat and dry the processed objects put into the gasification device. Background Art

[0002] Nowadays, waste disposal usually involves incineration before landfill. In incineration, waste is burned at high temperatures to reduce the weight and volume of the waste, thereby greatly reducing the space occupied by the waste being landfilled.

[0003] However, the incinerator equipment required for incineration is expensive, the unit volume construction cost is high, and a large investment is required. In addition, the incineration of waste is only an intermediate treatment, and the toxic waste gas, suspended particles, and inorganic residues produced in the end still need to be properly treated by other methods, which is still a burden on the environment.

[0004] As the amount of waste to be processed increases year by year, the incineration load of incinerators is also increasing. Excessive waste processing will affect the life of the incinerator, and new incinerators will be protested by environmentalists and cannot be built, making the waste processing capacity even more stretched. Therefore, new forms of waste treatment, such as gasification treatment, came into being.

[0005] Gasification treatment uses the principle of thermal cracking to decompose waste more effectively. Thermal cracking is different from the high-temperature combustion of traditional incineration treatment. It allows waste to react under limited isolation of oxygen or air. The advantage of gasification treatment is that it can recycle useful reaction byproducts (such as metals or compounds), which is very helpful for energy recovery and has the advantages of high efficiency and low pollution. Therefore, gasification treatment will become the mainstream technology for renewable energy utilization in future waste treatment.

[0006] However, the gasification device used in the gasification process will inevitably generate high-temperature exhaust gas during operation. Such high-temperature exhaust gas may escape into the atmosphere through the structural gaps of the gasification device, resulting in heat loss of the gasification device, which greatly reduces the gasification efficiency of the gasification device.

[0007] At the same time, the gasification efficiency of the gasification device is also limited by the type of waste to be gasified. When the waste has a high moisture content or the waste powder is agglomerated, the gasification efficiency of the gasification device will be reduced. Summary of the invention

[0008] In order to solve the problems faced by conventional technologies in the process of waste gasification treatment, the present invention proposes a heat recovery device for a gasification device, which not only prevents the waste heat of the gasification device from escaping, but also can use heat energy to heat and dry the treated material put into the gasification device.

[0009] The heat energy recovery device includes an air collecting hood, an air return pipe, and a first air flow multiplier. The air collecting hood is arranged between the furnace tube and the discharge pipe of the gasification device, and there is a gap between the furnace tube and the discharge pipe, and the air collecting hood surrounds the outside of the gap. The air return pipe is connected to the air collecting hood and is passed through the furnace body of the gasification device. The first air flow multiplier is connected to one end of the air return pipe opposite to the air collecting hood and is annularly arranged on the feed pipe of the gasification device. When the gasification device gasifies the processed object, the processed object generates internal gas after gasification, and the internal gas flows from the gap between the furnace tube and the discharge pipe. The flowing internal gas is recovered into the feed pipe via the air collecting hood, the air return pipe, and the first air flow multiplier.

[0010] In a preferred embodiment of the heat recovery device, the first airflow multiplier comprises a plurality of first ventilation channels annularly arranged on the feed pipe of the gasification device. The internal gas in the return pipe enters the feed pipe through the plurality of first ventilation channels.

[0011] In a preferred embodiment of the heat recovery device, when the internal gas enters the first airflow multiplier through the plurality of first ventilation holes of the first airflow multiplier, the first airflow multiplier generates a first traction airflow toward the furnace tube of the gasification device. The first traction airflow tractions the processed object in the feed pipe to move.

[0012] In a preferred embodiment of the heat recovery device, external gas located outside the gasification device and the heat recovery device is injected into the first air flow multiplier through the plurality of first ventilation channels and mixed with the internal gas.

[0013] In a preferred embodiment of the heat recovery device, the heat recovery device further comprises a second airflow multiplier, which is arranged at one end of the return air pipe connected to the air collecting hood. The second airflow multiplier comprises a plurality of second ventilation channels arranged in an annular manner. External gas located outside the gasification device and the heat recovery device is injected into the second airflow multiplier through the plurality of second ventilation channels.

[0014] In a preferred embodiment of the heat energy recovery device, when the external gas is injected into the second airflow multiplier through the multiple second ventilation holes of the second airflow multiplier, the second airflow multiplier generates a second traction airflow toward one end of the return air pipe connected to the first airflow multiplier, and the second traction airflow draws the internal gas flow.

[0015] In a preferred embodiment of the heat recovery device, the external gas includes nitrogen.

[0016] In a preferred embodiment of the heat energy recovery device, the internal gas enters the feed pipe of the gasification device through the heat energy recovery device to heat and dry the processed object located in the feed pipe.

[0017] In a preferred embodiment of the heat energy recovery device, the gasification device heats a portion of the return air pipe located inside the furnace body of the gasification device and the internal gas in the return air pipe.

[0018] In a preferred embodiment of the heat energy recovery device, the gas collecting hood also covers a sedimentation tank connected to the discharge pipe of the gasification device.

[0019] The heat energy recovery device of the present invention sets the gas collecting hood between the furnace tube and the discharge pipe of the gasification device, and uses the gas collecting hood to collect the internal gas leaked from the gap between the furnace tube and the discharge pipe. The present invention recovers the leaked internal gas and sends it into the feed pipe via the gas collecting hood, the second airflow multiplier, the return air pipe, and the first airflow multiplier. The internal gas is the product of the gasification of the processed object and has high thermal energy, which can be used to heat and dry the processed object to be put into the gasification device. Since the processed object has been heated and dried before entering the gasification device, the gasification efficiency of the gasification device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic structural diagram of a heat recovery device and a feeding device for a gasification device of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the connection between the feeding device and the gasification device of the present invention.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the turbine blade assembly and the furnace tube of the present invention. DETAILED DESCRIPTION

[0024] The following describes the preferred embodiments of the present invention with reference to the drawings of the specification to prove that the present invention can be implemented. The embodiments of the invention can fully introduce the present invention to those skilled in the art, making its technical content clearer and easier to understand. The present invention can be embodied through many different forms of invention embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned in the text. In the drawings, components with the same structure are represented by the same numerical labels, and components with similar structures or functions are represented by similar numerical labels. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0025] In addition, the following descriptions of the various embodiments of the invention are made with reference to the attached diagrams to illustrate specific embodiments of the invention that the present invention can be implemented with. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] Please refer to Figure 1 , which is a schematic diagram of the structure of the heat recovery device and the feeding device for the gasification device of the present invention. The heat recovery device R for the gasification device of the present invention is arranged in the gasification device 200, and the gasification device 200 is connected to the feeding device 100.

[0027] The feeding device 100 is used to transport the processed object X (e.g., waste), and is connected to the first airflow multiplier R1 of the heat recovery device R of the gasification device 200. The first airflow multiplier R1 includes a plurality of first ventilation channels H1 arranged in an annular shape, and the external gas A2 is injected into the first airflow multiplier R1 through the plurality of first ventilation channels H1.

[0028] The gasification device 200 is used to gasify the processed object X, and the gasification device 200 includes a furnace tube 210, a discharge pipe 220, a furnace body 230, a feed pipe 240, and a sedimentation tank 250. The gasification device 200 also includes a heater 260. The heater 260 is used to heat the furnace tube 210 and the processed object X inside the furnace tube 210. The inner wall of the furnace tube 210 may also be provided with a spiral guide plate 211, and the furnace tube 210 may be a rotating furnace tube. Thereby, the processed object X that can be processed by the furnace tube 210 may be, for example, waste, cement or other industrial process products. The present invention does not limit the type of the processed object X. Therefore, the gasification device 200 of the present invention may also perform process steps with different temperature and pressure requirements, such as incineration, sintering or carbonization, and the present invention is not limited thereto.

[0029] During the gasification process of the gasification device 200, the processed object X is first transported from the feed device 100 to the feed pipe 240, and then continuously fed into the furnace tube 210. The furnace body 230 covers the continuously rotating furnace tube 210, and continuously heats the furnace tube 210 and the processed object X in the furnace tube 210. By controlling the air composition inside the furnace tube 210 and isolating oxygen from reacting with the processed object X to a limited extent, the processed object X is thermally cracked. After the processed object X is gasified by the gasification device 200, it is finally converted into carbonized inorganic matter and the internal gas A1 is discharged through the discharge pipe 220.

[0030] Generally speaking, in the product of the processed object X after gasification, the heavier carbonized inorganic substances will accumulate in the sedimentation tank 250 below the discharge pipe 220, while the lighter internal gas A1, because it contains some toxic substances, must be collected and wait for treatment or other subsequent treatment. It is worth mentioning that the carbonization rate of the processed object X can be controlled by multiplying the airflow (by controlling the oxygen content), which can reduce the demand for motor / mechanical power.

[0031] However, it is impossible to seal the continuously rotating furnace tube 210 and the stationary discharge tube 220 , so a ring gap G is generated. The internal gas A1 leaks from the gap and takes away part of the heat energy of the gasification device 200 .

[0032] like Figure 1 As shown, the heat recovery device R of the gasification device of the present invention includes an air collecting hood R3, an air return pipe R2 and the first air flow multiplier R1.

[0033] The gas collecting hood R3 is disposed between the furnace tube 210 and the discharge pipe 220 of the gasification device, and surrounds the outside of the gap G. The gas collecting hood R3 collects the leaked internal gas A1, so that the heat energy of the gasification device 200 is maintained in the gas collecting hood R3.

[0034] The gas collecting hood R3 is connected to the gas return pipe R2. The gas return pipe R2 is arranged in the furnace body 230 of the gasification device 200. The end of the gas return pipe R2 opposite to the gas collecting hood R3 is connected to the first airflow multiplier R1. The first airflow multiplier R1 is arranged in an annular manner on the feed pipe 240 of the gasification device 200.

[0035] The internal gas A1 leaking from the gap G between the furnace tube 210 and the discharge pipe 220 is first collected by the gas collecting hood R3, and then recycled into the feed pipe 240 through the return air pipe R2 and the first airflow multiplier R1, and the processed object X located in the feed pipe 240 is heated and dried.

[0036] At the same time, since the interior of the furnace body 230 is continuously kept at a high temperature during the gasification process of the gasification device 200, the return air pipe R2 passing through the furnace body 230 is indirectly heated. Therefore, the internal gas A1 flowing through the return air pipe R2 can also be kept warm or even reheated, and finally the heat is brought to the processed object X located in the feed pipe 240, so that the processed object X that has not yet entered the gasification device 200 can be fully heated and dried.

[0037] exist Figure 1 In the embodiment, the first air flow multiplier R1 includes a plurality of first ventilation holes H1 annularly arranged on the feed pipe 240 of the gasification device 200. The internal gas A1 in the return air pipe R2 can enter the feed pipe 240 through the plurality of first ventilation holes H1 annularly arranged, and perform 360-degree surrounding heating and drying on the processed object X located in the feed pipe 240.

[0038] The first airflow multiplier R1 is an air amplifier that utilizes the Coanda effect. When the external gas A2 enters the first airflow multiplier R1 through the plurality of first ventilation holes H1 of the first airflow multiplier R1, the first airflow multiplier R1 generates a first traction airflow F1 toward the furnace tube 210 of the gasification device 200 due to the gas wall attachment effect of the Coanda effect. In this way, the first traction airflow F1 generated by the first airflow multiplier R1 can traction the processed object X in the feed pipe 240 to move toward the furnace tube 210. At the same time, since the processed object X moves toward the gasification device 200 following the first traction airflow F1, the feeding speed of the processed object X into the furnace tube 210 can be adjusted through the flow rate of the first traction airflow F1.

[0039] Please refer to Figure 2 , which is a schematic diagram of the structure of the connection between the feeding device and the gasification device of the present invention. In one embodiment, the feeding device 100 further includes a rotary discharge valve 110, and the first airflow multiplier R1 is connected to the rotary discharge valve 110. When the processed object X is put into the feeding device 100, it is first stored in the rotary discharge valve 110. The impeller of the rotary discharge valve 110 is designed to continuously release the piled processed object X and maintain the air tightness of the gasification device 200 at the rear end of the feeding device 100. The rotary discharge valve 110 uses a variable frequency motor to drive the impeller, and the discharge amount of the processed object X can be adjusted through the speed of the impeller rotation, which is convenient for operation and maintenance.

[0040] In one embodiment, the external gas A2 contains nitrogen. The external gas A2 is not only injected into the first gas flow multiplier R1 to assist in generating the first traction gas flow F1, and the first traction gas flow F1 is enhanced when the heat recovery device R circulates the internal gas A1 back into the feed pipe 240, but the external gas A2 containing nitrogen isolates the processed object X from oxygen. Thereby, the feed device 100 at the front end of the gasification device 200 is filled with nitrogen, and the first traction gas flow F1 saturated with nitrogen is used to draw the processed object X into the gasification device 200, which can reduce and limit the reaction between oxygen and the processed object X during the gasification process of the gasification device 200. In other embodiments, the external gas A2 can be oxygen, nitrogen and a mixture thereof, or other gases such as air; in actual applications, the reaction temperature and gas composition can also be adjusted according to the actual reactants, for example, it can be oxygen-enriched combustion, oxygen-deficient combustion or other reaction states, and the present invention is not limited thereto.

[0041] exist Figure 1 In the embodiment, the heat recovery device R further comprises a second airflow multiplier R4. The second airflow multiplier R4 is arranged at one end of the return air pipe R2 connected to the air collecting hood R3, and comprises a plurality of second air vents H2 arranged in an annular manner.

[0042] The second airflow multiplier R4 is also a gas amplifier using the Coanda effect. When the external gas A2 is injected into the second airflow multiplier R4 through the plurality of second ventilation holes H2, due to the gas wall attachment effect of the Coanda effect, the second airflow multiplier R4 will generate a second traction airflow F2 toward the end of the return air pipe R2 connected to the first airflow multiplier R1. The second traction airflow F2 generated by the second airflow multiplier R4 can pull the internal gas A1 toward the feed pipe 240 connected to the first airflow multiplier R1.

[0043] As mentioned above, through the configuration of the first multiplier R1 and the second airflow multiplier R4, the heat recovery device R of the present invention can circulate the internal gas A1 back into the feed pipe 240 when processing the internal gas A1, so that the internal gas A1, which is lighter and contains some toxic substances, can enter the feed pipe 240 again for circulation after being collected in the discharge pipe 220 and before waiting for treatment, without the need for other subsequent treatment processes, such as secondary heating, secondary combustion or catalytic conversion, to meet the emission standards of relevant regulations (such as dioxin content), so that the heat recovery device R of the present invention can further reduce carbon emissions, reduce overall process energy loss and reduce related costs.

[0044] In one embodiment, the gas collecting hood R3 also covers the sedimentation tank 250 connected to the discharge pipe 220 of the gasification device 200. The gas collecting hood R3 completely covers all outlets of the gasification device 200, so the gasification device 200 is not easy to lose heat energy during the gasification process.

[0045] Continue to refer to Figure 1 And with reference Figure 3 , Figure 3 1 is a three-dimensional structural diagram of the turbine blade assembly 120 and the rotary furnace tube 210 of the present invention. The feeding device 100 of the present invention further comprises a turbine blade assembly 120. The turbine blade assembly 120 is connected to the first airflow multiplier R1 to disperse the processed object X.

[0046] The turbine blade assembly 120 includes a first turbine blade 121 and a second turbine blade 122. The first turbine blade 121 faces the first airflow multiplier R1. The second turbine blade 122 is arranged on a side of the first turbine blade 121 that faces away from the first airflow multiplier R1. The first turbine blade 121 and the second turbine blade 122 rotate relative to each other to disperse the processed object X.

[0047] The first turbine blade 121 and the second turbine blade 122 have different blade angle designs, and can perform relative rotation when the first traction airflow F1 flows through the turbine blade group 120 .

[0048] Continue to refer to Figure 3 , when the first turbine blade 121 and the second turbine blade 122 perform relative rotational motion when the first traction airflow F1 flows through, each blade of the first turbine blade 121 and each blade of the second turbine blade 122 will be in a state of continuous staggering. In other words, the processed object X pulled by the first traction airflow F1 will be broken up by the multiple blades that are constantly staggered. And the partially agglomerated processed object X is broken up into powder, that is, the kinetic energy and heating area of ​​the processed object X entering the furnace tube 210 are increased. At the same time, each blade of the first turbine blade 121 and each blade of the second turbine blade 122 that are constantly staggered can produce an effect similar to the opening and closing of a valve. Since the nozzle of the furnace tube 210 of the gasification device 200 is an area where heat energy is easily dissipated, the turbine blade group 120 can serve as a valve at the nozzle of the furnace tube 210, so that the gasification device 200 can continuously perform gasification treatment.

[0049] Next, the first traction airflow F1 flowing through the turbine blade assembly 120 has a first rotation direction D1. The spiral guide plate 211 of the furnace tube 210 has a second rotation direction D2. The second rotation direction D2 is opposite to the first rotation direction D1.

[0050] like Figure 3As shown, the spiral guide plate 211 disposed on the inner wall of the furnace tube 210 can generate a local flow field inside the furnace tube 210 and increase the effective heat exchange path. When the gasification device 200 performs gasification treatment on the processed object X, the fluid inside the furnace tube 210 moves in the tube in a laminar flow. Because the path inside the furnace tube 210 with the spiral guide plate 211 is curved and spiral, the centripetal force effect generated by the fluid at the bend causes the fluid located at the center of the furnace tube 210 to move outward, and at the same time forces the fluid originally located in the tube wall area to rotate toward the center of the furnace tube 210 in the second rotation direction D2. Since the first rotation direction D1 and the second rotation direction D2 are designed to rotate in opposite directions, a vortex flow (Dean vortex flow) is formed in the furnace tube 210, which will produce a better heat transfer effect than a straight-through furnace tube.

[0051] Please refer to Figure 1 , the heater 260 of the gasification device 200 also includes a plurality of heating sources 261, which are used to heat the furnace tube 210 and the processed object X inside the furnace tube 210 in different regions. The heater 260 of the gasification device 200 of the present invention has the function of multi-zone heating control and monitoring. By means of the plurality of heating sources 261, the temperature can be controlled respectively for different regions before and after the furnace tube 210. In addition, different types of processed objects X have different endothermic and exothermic reactions, which also require corresponding heating settings. The plurality of heating sources 261 with the function of heating the furnace tube 210 in different regions can change the heating temperature of different regions in real time according to different heating requirements. At the same time, the heater 260 also has an automatic adjustment function. When the target temperature setting value changes, data will be collected and a model will be established to perform adjustment, calculate reasonable heating power, and issue component abnormality warnings.

[0052] In order to optimize the gasification processing efficiency of the gasification device 200, in addition to monitoring and adjusting the multiple heating sources 261 of the heater 260, the present invention can also monitor and adjust: the feed speed of the processed object X pulled by the first traction airflow F1, the interleaving frequency of the first turbine blades 121 and the second turbine blades 122, the rotation speed of the furnace tube 210, etc.

[0053] The heat energy recovery device R of the present invention is provided with the gas collecting hood R3 between the furnace tube 210 and the discharge pipe 220 of the gasification device 200, and the internal gas A1 leaked from the gap G between the furnace tube 210 and the discharge pipe 220 is collected by the gas collecting hood R3. The present invention recovers the leaked internal gas A1 and feeds it into the feed pipe 240 via the gas collecting hood R3, the second airflow multiplier R4, the return air pipe R2, and the first airflow multiplier R1. The internal gas A1 is a product of the gasification of the processed object X and has high thermal energy, and can be used to heat and dry the processed object X to be put into the gasification device 200. Since the processed object X has been heated and dried before entering the gasification device 200, the gasification efficiency of the gasification device 200 is improved. In addition, in the present invention, the first airflow multiplier R1 and the turbine blade group 120 of the feeding device 100 can increase the kinetic energy and heating area of ​​the processed object X entering the furnace tube 210; the spiral guide plate 211 of the furnace tube 210 in the gasification device 200 can provide the processed object X with a better heat transfer effect. The heat energy recovery device for the gasification device of the present invention can not only solve the problems faced by the conventional technology in the waste gasification treatment process, but also further improve the efficiency of the waste gasification treatment.

[0054] It is worth further explaining that by applying the heat recovery device of the present invention to the gasification device, it is helpful to further dry the processed object compared with the prior art to reduce the moisture content in the processed object. In addition, the heat energy generated by the reaction is recycled to preheat the processed object before entering the furnace tube, reducing the temperature drop of the processed object before entering the furnace tube, and there is no need to perform multi-stage temperature rise and fall operations on the furnace tube as in the prior art, thus helping to reduce the overall volume of the gasification device.

[0055] In addition, compared to conventional furnace tubes or sintering furnaces, since the gasification device of the present invention is capable of continuous operation rather than batch reaction, the amount of the processed material (taking general waste as an example) processed per unit time can be increased from an average of about 50 kg / hour (kg / hr) in the prior art to about 200 kg / hr. In addition, the thermal efficiency of the currently available rotary furnace tubes is about 50-65%. By using the heat recovery device of the present invention, the gas generated by the processed material processed once by the gasification device is subjected to secondary treatment by the first airflow multiplier and the second airflow multiplier, and the thermal efficiency of the gasification device (rotary furnace tube) can be increased to about 80%.

[0056] A heat recovery device provided in an embodiment of the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical scheme and core idea of ​​the present invention. Ordinary technicians in this field should understand that they can still modify the technical schemes recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the present invention.

Claims

1. A heat recovery device for a gasification device, characterized in that: The heat recovery device comprises: A gas collecting hood is arranged between the furnace tube and the discharge pipe of the gasification device, there is a gap between the furnace tube and the discharge pipe, and the gas collecting hood surrounds the outside of the gap; a gas return pipe connected to the gas collecting hood and passing through the furnace body of the gasification device; and A first airflow multiplier connected to one end of the air return pipe opposite to the air collecting hood and annularly arranged on the feed pipe of the gasification device; When the gasification device gasifies the processed object, the processed object generates internal gas after gasification, and the internal gas flows from the gap between the furnace tube and the discharge pipe. The flowing internal gas is recovered into the feed pipe through the gas collecting hood, the return air pipe, and the first airflow multiplier.

2. The heat recovery device according to claim 1, characterized in that: The first air flow multiplier includes a plurality of first ventilation holes annularly arranged on the feed pipe of the gasification device, and the internal gas in the return pipe enters the feed pipe through the plurality of first ventilation holes.

3. The heat recovery device according to claim 2, characterized in that: When the internal gas enters the first airflow multiplier through the multiple first ventilation channels of the first airflow multiplier, the first airflow multiplier generates a first traction airflow toward the furnace tube of the gasification device, and the first traction airflow pulls the processed object located in the feed pipe to move.

4. The heat recovery device according to claim 3, characterized in that: External gas located outside the gasification device and the heat recovery device is injected into the first air flow multiplier through the plurality of first ventilation channels and mixed with the internal gas.

5. The heat recovery device according to claim 1, characterized in that: The heat energy recovery device also includes a second air flow multiplier, which is arranged at one end of the return air pipe connected to the air collecting hood, and the second air flow multiplier includes a plurality of second ventilation channels arranged in a ring, and the external gas located outside the gasification device and the heat energy recovery device is injected into the second air flow multiplier through the plurality of second ventilation channels.

6. The heat recovery device according to claim 5, characterized in that: When the external air is injected into the second air flow multiplier through the plurality of second ventilation holes of the second air flow multiplier, the second air flow multiplier generates a second traction air flow toward one end of the return air duct connected to the first air flow multiplier, and the second traction air flow draws the internal air flow.

7. The heat recovery device according to claim 4 or 5, characterized in that: The external gas includes nitrogen.

8. The heat recovery device according to claim 1, characterized in that: The internal gas enters the feed pipe of the gasification device through the heat energy recovery device to heat and dry the processed object in the feed pipe.

9. The heat recovery device according to claim 1, characterized in that: The gasification device heats a portion of the gas return pipe located inside the furnace body of the gasification device and the internal gas in the gas return pipe.

10. The heat recovery device according to claim 1, characterized in that: The gas collecting hood also covers a sedimentation tank connected to the discharge pipe of the gasification device.

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