High-temperature flue gas circulation ejector for waste incineration system

Abstract

The utility model discloses a high-temperature flue gas circulation ejector for a waste incineration system, which comprises a machine base, a driving mechanism, an ejector shell and a conical shrinkage pipe are arranged on the machine base, and a flue gas inlet and a flue gas outlet are arranged on the ejector shell; the conical shrinkage pipe is connected with the ejector shell, the large-caliber end of the conical shrinkage pipe is communicated with the flue gas outlet, and the small-caliber end of the conical shrinkage pipe is provided with a flue gas injection pipe; a rotatable driving main shaft is arranged in the ejector shell, the output end of the driving mechanism is connected with the driving main shaft, the driving mechanism can drive the driving main shaft to rotate, the driving main shaft is sleeved with spiral fan blades, and the spiral fan blades are used for blowing air towards the smoke outlet. According to the utility model, the residence time of flue gas in the furnace can be prolonged, so that harmful substances in the flue gas can be fully decomposed; flue gas is injected, turbulent mixing of the flue gas and oxygen in the combustion chamber is enhanced, and decomposition of harmful substances is accelerated; the whole structure is compact, and placing, carrying and maintaining are convenient.

Description

Technical Field

[0001] This utility model relates to the field of waste incineration system technology, specifically to a high-temperature flue gas recirculation ejector for waste incineration systems. Background Technology

[0002] Traditionally, landfilling has been the primary method for treating solid waste. However, practice has shown that landfilling causes significant environmental pollution, directly contaminating groundwater and severely polluting land resources while also occupying a large amount of land. It was later discovered that incinerating waste has a lower environmental impact.

[0003] Waste incinerators are a crucial component of waste incineration systems. In existing incinerators, the residence time of flue gas within the furnace is typically short, resulting in the incomplete decomposition of harmful substances such as dioxins and chlorides. Furthermore, as the flue gas temperature decreases during emission, undecomposed substances can easily recombine into toxic compounds, causing secondary pollution. Some existing technologies address these issues by increasing the furnace volume or adding an external secondary combustion chamber. However, both methods suffer from high manufacturing costs, large size making placement and transportation difficult, and complex structures. Utility Model Content

[0004] To address some or all of the problems existing in the prior art, this utility model provides a high-temperature flue gas recirculation ejector for a waste incineration system, comprising a base, a drive mechanism, an ejector housing, and a conical contraction tube on the base. The ejector housing has a flue gas inlet and a flue gas outlet. The flue gas inlet is used to connect to the exhaust pipe of the waste incineration system. The conical contraction tube is connected to the ejector housing, and its large-diameter end is connected to the flue gas outlet. The small-diameter end of the conical contraction tube is provided with a flue gas injection pipe, which is used to connect to the combustion chamber of the waste incineration system. A rotatable drive shaft is provided inside the ejector housing. The output end of the drive mechanism is connected to the drive shaft, and the drive mechanism can drive the drive shaft to rotate. A spiral fan blade is sleeved on the drive shaft, and the spiral fan blade is used to blow air towards the flue gas outlet.

[0005] As a further improvement of this utility model, the driving mechanism includes a driving motor and a transmission assembly. The driving motor is connected to the base, and the transmission assembly is connected to the output end of the driving motor. One end of the driving spindle extends out of the ejector housing, and the transmission assembly is connected to the end of the driving spindle that extends out of the ejector housing.

[0006] As a further improvement of this utility model, the transmission assembly includes a drive pulley, a driven pulley, and a transmission belt. The drive pulley is connected to the output end of the drive motor, the driven pulley is sleeved on the end of the drive spindle that extends out of the ejector housing, and the transmission belt is sleeved on the drive pulley and the driven pulley respectively.

[0007] As a further improvement of this utility model, a sealing ring is sleeved on the drive spindle, the sealing ring is sealed to the ejector housing, and the sealing ring is slidably sealed to the drive spindle.

[0008] As a further improvement of this utility model, a heat dissipation fan blade is sleeved on one end of the drive spindle that extends out of the ejector housing.

[0009] As a further improvement of this utility model, the spiral fan blade is made of high temperature resistant material, and the spiral fan blade is provided with multiple blades, the surface of which is provided with an anti-dust coating.

[0010] As a further improvement of this utility model, the flue gas injection pipe is detachably connected to the tapered contraction pipe via a connecting flange.

[0011] As a further improvement of this utility model, the inner diameter of the large-diameter end of the tapered contraction tube is not less than the inner diameter of the flue gas outlet.

[0012] As a further improvement of this utility model, the central axis of the conical contraction tube coincides with the rotation axis of the spiral fan blade.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model can re-extract high-temperature flue gas into the combustion chamber of the waste incineration system without increasing the furnace volume or requiring an external secondary combustion chamber, thus extending the residence time of the flue gas in the waste incinerator and allowing harmful substances such as dioxins and chlorides in the flue gas to be fully decomposed.

[0015] 2. This utility model uses a conical contraction tube to inject flue gas, which can increase the flow velocity of the flue gas, thereby enhancing the turbulent mixing of flue gas and oxygen in the combustion chamber, improving combustion efficiency, and accelerating the decomposition of harmful substances.

[0016] 3. The overall structure is compact, which can reasonably control the production cost and overall size of the equipment, making it easy to place and move. It also reduces mechanical structure and is conducive to maintenance and upkeep. Attached Figure Description

[0017] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the internal structure of the ejector housing in an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the external structure of an embodiment of this utility model. Detailed Implementation

[0020] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0021] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figure 1-2 As shown, a high-temperature flue gas recirculation ejector for a waste incineration system includes a base 1 with bolt holes for mounting the ejector to the side wall of the waste incinerator or other pre-set installation position. The base 1 includes a drive mechanism, an ejector housing 2, and a conical contraction tube 3. The ejector housing 2 has a flue gas inlet 21 and a flue gas outlet 22. The flue gas inlet 21 is used to connect to the exhaust pipe of the waste incineration system, allowing flue gas to enter the ejector housing 2 through the inlet. The flue gas outlet 22 is used to connect to the conical contraction tube 3.

[0024] Specifically, the conical contraction tube 3 is fixedly connected to the ejector housing 2 by bolts. The large-diameter end of the conical contraction tube 3 is connected to the flue gas outlet 22, and the small-diameter end of the conical contraction tube 3 is provided with a flue gas injection pipe 4, which is used to connect to the combustion chamber of the waste incineration system. The ejector housing 2 is provided with a rotatable drive shaft 5. The output end of the drive mechanism is connected to the drive shaft 5, and the drive mechanism can drive the drive shaft 5 to rotate inside the ejector housing 2. A spiral fan blade 6 is sleeved on the drive shaft 5, and the spiral fan blade 6 is used to blow air towards the flue gas outlet 22.

[0025] Before operation, connect the flue gas inlet 21 to the flue gas outlet pipe of the waste incineration system, and connect the flue gas injection pipe 4 to the combustion chamber of the waste incineration system. During operation, the flue gas generated by the waste incineration system flows into the ejector housing 2 through the flue gas inlet 21. The control drive mechanism operates, driving the drive shaft 5 to rotate the spiral fan blades 6. The rotating spiral fan blades 6 blow the flue gas in the ejector housing 2 towards the flue gas outlet 22, and then the flue gas enters the conical contraction tube 3. The flue gas flows from the large-diameter end to the small-diameter end of the conical contraction tube 3. As the diameter of the conical contraction tube 3 gradually decreases, the flow velocity of the flue gas increases, resulting in ejection. The high-speed flue gas flows out from the small-diameter end of the conical contraction tube 3 and then flows back into the combustion chamber of the waste incineration system through the flue gas injection pipe 4. Increasing the velocity of the flue gas flowing into the combustion chamber can enhance the turbulent mixing of the flue gas and oxygen in the combustion chamber, improve combustion efficiency, and accelerate the decomposition of harmful substances.

[0026] This high-temperature flue gas recirculation ejector for waste incineration systems can re-extract flue gas into the combustion chamber of the waste incineration system, extending the residence time of the flue gas in the incinerator. This allows for the full decomposition of harmful substances such as dioxins and chlorides in the flue gas, reducing the amount of harmful substances in the final emitted flue gas and improving the environmental performance of the waste incineration system. Furthermore, its simple mechanical structure eliminates the need to increase the furnace volume or add an external secondary combustion chamber, allowing for better control of manufacturing costs and overall size, facilitating placement, transportation, maintenance, and upkeep.

[0027] In this embodiment, the spiral fan blade 6 is made of a high-temperature resistant alloy material. The use of this material ensures that high-temperature flue gas will not affect the stability of the spiral fan blade 6. The spiral fan blade 6 has multiple blades, and each blade has an anti-dust accumulation coating. This coating reduces the adhesion of particulate matter from the flue gas to the spiral fan blade 6, extending its service life and reducing maintenance costs.

[0028] To improve flue gas flow, in this embodiment, the inner diameter of the large-diameter end of the tapered contraction tube 3 is slightly larger than the inner diameter of the flue gas outlet 22. This ensures that the flue gas does not encounter obstruction as it flows from the ejector housing 2 to the tapered contraction tube 3, allowing it to flow more smoothly. In other embodiments, the inner diameter of the large-diameter end of the tapered contraction tube 3 is the same as the inner diameter of the flue gas outlet 22.

[0029] On the other hand, the central axis of the conical contraction tube 3 coincides with the rotation axis of the spiral fan blade 6, which allows the flue gas blown out by the spiral fan blade 6 to flow smoothly into the conical contraction tube 3, preventing the flue gas from forming eddies in the conical contraction tube 3, improving the flue gas flowability, and facilitating the ejection of the flue gas through the conical contraction tube 3 to increase the speed of the flue gas.

[0030] In this embodiment, the flue gas injection pipe 4 is detachably connected to the tapered contraction pipe 3 via the connecting flange 7. The detachable connection method facilitates replacement and maintenance, as well as assembly, thereby improving the convenience of operation.

[0031] The drive mechanism includes a drive motor 8 and a transmission assembly. The drive motor 8 is fixedly mounted on the base 1. The transmission assembly is connected to the output end of the drive motor 8. One end of the drive spindle 5 extends out of the ejector housing 2, and this end is connected to the transmission assembly. In operation, the drive motor 8 drives the transmission assembly to move. The movement of the transmission assembly causes the drive spindle 5 to rotate, which in turn drives the spiral fan blades 6 to rotate. This causes the flue gas inside the ejector housing 2 to be blown out towards the flue gas outlet 22, allowing the flue gas to flow into the conical contraction tube 3 for ejection. Finally, the flue gas is injected into the combustion chamber of the waste incineration system through the flue gas injection pipe 4.

[0032] In this embodiment, the transmission assembly includes a drive pulley 9, a driven pulley 10, and a transmission belt 11. The drive pulley 9 is connected to the output shaft of the drive motor 8. The driven pulley 10 is sleeved on one end of the drive shaft 5 extending out of the ejector housing 2. The transmission belt 11 is sleeved on both the drive pulley 9 and the driven pulley 10. When the drive motor 8 operates, it drives the drive pulley 9 to rotate, which in turn pulls the transmission belt 11. The transmission belt 11 then drives the driven pulley 10, the drive shaft 5, and the spiral fan blades 6 to rotate, thereby achieving the purpose of blowing flue gas into the conical contraction tube 3.

[0033] In other embodiments, the transmission component may also be other structures, such as gear sets, sprocket structures, etc.

[0034] In this embodiment, there are two transmission belts 11, which can improve the stability of transmission; in other embodiments, the number of transmission belts 11 can be any other number.

[0035] A sealing ring 12 is fitted onto the drive spindle 5, and the sealing ring 12 is in a sealing connection with the ejector housing 2, and the sealing ring 12 is in a sliding sealing connection with the drive spindle 5. By setting the sealing ring 12, the sealing performance between the drive spindle 5 and the ejector housing 2 can be improved, and flue gas leakage can be prevented.

[0036] A cooling fan blade 13 is fitted onto one end of the drive spindle 5 extending from the ejector housing 2. The cooling fan blade 13 blows air onto the driven pulley 10, thereby cooling the driven pulley 10 and the transmission belt 11 and extending their service life. During operation, the rotation of the drive spindle 5 drives the cooling fan blade 13 to rotate, which in turn blows air onto the driven pulley 10 and the transmission belt 11, achieving the purpose of cooling the driven pulley 10 and the transmission belt 11.

[0037] Working principle:

[0038] During processing, flue gas enters the ejector housing 2 through flue gas inlet 21. The drive motor 8 operates, driving the drive pulley 9 to rotate. The drive pulley 9 pulls the transmission belt 11, which in turn drives the driven pulley 10, the drive shaft 5, and the spiral fan blades 6 to rotate. The rotating spiral fan blades 6 blow the flue gas inside the ejector housing 2 towards the conical contraction tube 3. The flue gas flows in from the large-diameter end of the conical contraction tube 3 and then flows out from the small-diameter end to the flue gas injection pipe 4. Finally, it is re-injected into the combustion chamber of the waste incineration system through the flue gas injection pipe 4. As the flue gas flows through the conical contraction tube 3, the gradually decreasing diameter of the tube increases the flow velocity, causing the flue gas to be ejected. The high-speed flue gas, injected into the combustion chamber through the flue gas injection pipe 4, mixes with oxygen in a turbulent flow, improving combustion efficiency and accelerating the decomposition of harmful substances.

[0039] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A high temperature flue gas circulation ejector for a waste incineration system, characterized by: The utility model relates to a smoke injection device for waste incineration system, which comprises a base, a driving mechanism, an ejector housing and a tapered contraction pipe. The tapered contraction pipe is connected with the ejector housing, the large-diameter end of the tapered contraction pipe is communicated with the smoke outlet, and the small-diameter end of the tapered contraction pipe is provided with a smoke injection pipe which is used to connect with the combustion chamber of the waste incineration system. The driving mechanism comprises a driving motor and a transmission assembly, the driving motor is connected with the base, the transmission assembly is connected with the output end of the driving motor, one end of the driving main shaft extends out of the ejector housing, and the transmission assembly is connected with the end of the driving main shaft extending out of the ejector housing.

2. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 1 wherein: The transmission assembly comprises a driving pulley, a driven pulley and a transmission belt, the driving pulley is connected with the output end of the driving motor, the driven pulley is sleeved on the end of the driving main shaft extending out of the ejector housing, and the transmission belt is sleeved on the driving pulley and the driven pulley respectively.

3. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 2 wherein: The driving main shaft is sleeved with a sealing ring, the sealing ring is sealingly connected with the ejector housing, and the sealing ring is slidingly connected with the driving main shaft.

4. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 1 wherein: The end of the driving main shaft extending out of the ejector housing is sleeved with a heat dissipation fan blade.

5. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 2 wherein: The spiral fan blade is made of high-temperature resistant material, a plurality of blades are arranged on the spiral fan blade, and the surface of the blade is provided with an anti-dust coating.

6. The high-temperature flue gas circulation ejector for a waste incineration system according to any one of claims 1 to 5, characterized in that: The smoke injection pipe is detachably connected with the tapered contraction pipe through a connecting flange.

7. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 6 wherein: The inner diameter of the large-diameter end of the tapered contraction pipe is not less than the inner diameter of the smoke outlet.

8. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 6 wherein: The central axis of the tapered contraction pipe coincides with the rotation axis of the spiral fan blade.

9. The high temperature flue gas circulation ejector for waste incineration system as claimed in claim 6 wherein: ​

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