Sealed primary air fan and garbage power generation system

Abstract

The invention discloses a sealed primary fan and a garbage power generation system, and the sealed primary fan is characterized in that an exhaust pipe is connected to a rotating shaft sealing cover on an inlet air pipe of the primary fan, and the rotating shaft sealing cover is additionally arranged on the periphery of the side surface of a fan rotating shaft so as to seal a gap between the fan rotating shaft and an impeller volute; and the rotating shaft is subjected to shell packaging by using a PVC material. Therefore, under the driving of centrifugal force generated by the primary fan, strong negative pressure is applied to the inlet air pipe, and negative pressure suction force is transmitted to the rotating shaft sealing cover located at the gap between the suction rotating shaft and the impeller volute through the exhaust pipe, so that odor in the gap between the rotating shaft and the impeller volute and heat emitted by the rotating shaft are effectively sucked; and stable operation of the primary air fan is ensured. Furthermore, the sealing effect is effectively improved through the negative pressure self-sealing mode at the gap between the rotating shaft of the primary air fan and the volute of the impeller.

Description

Technical Field

[0001] The present application relates to the technical field of incineration power generation, and more specifically, to a sealed primary fan and a garbage power generation system. Background Art

[0002] In the operation system of modern waste-to-energy plants, primary fans are core equipment and their self-sealing design is of great significance to the stable operation of the power generation system and environmental safety.

[0003] The current self-sealing technology of primary fans uses sealing rings to seal and isolate the inside of the fan from the external environment. The sealing ring is a key component in the primary fan system, and its performance is directly related to the operating efficiency and service life of the fan. For example, when running at full load, if the sealing effect of the sealing ring is improved by 1%, it can greatly reduce gas leakage by millions of cubic meters, significantly reducing energy consumption and operating costs.

[0004] Traditional sealing rings are mostly made of metal materials such as carbon steel or stainless steel. Although they have certain mechanical strength and corrosion resistance, under high temperature conditions (greater than 150°C), metal sealing rings are prone to increase the sealing gap due to thermal expansion. In addition, their high friction coefficient aggravates the wear of the sealing surface, seriously weakening the sealing effect, resulting in frequent odor (hydrogen sulfide, hydrogen chloride, ammonia, etc.) leakage in the gap between the fan shaft and the volute. Summary of the invention

[0005] In view of the above problems, the present application provides a sealed primary fan and a garbage power generation system to avoid odor leakage.

[0006] In order to achieve the above objectives, the specific plan is proposed as follows:

[0007] A sealed primary fan comprises a fan inlet duct, a fan shaft, an impeller volute, a fan outlet duct and a sealing component;

[0008] The sealing component includes an exhaust pipe and a shaft sealing cover. The fan inlet air pipe is connected to the shaft sealing cover through the exhaust pipe. The shaft sealing cover is installed around the side surface of the fan shaft to seal the gap between the fan shaft and the impeller volute.

[0009] Optionally, the fan shaft is a cylinder, the shaft sealing cover is a hollow cylinder, and the fan shaft is embedded in the hollow part of the shaft sealing cover.

[0010] Optionally, the exhaust pipe is connected to the side surface of the shaft sealing cover.

[0011] Optionally, the outer shell of the fan shaft is attached with PVC material.

[0012] Optionally, the exhaust pipe is made of PVC material.

[0013] Optionally, the material of the rotating shaft sealing cover is PVC material.

[0014] A garbage power generation system comprises the sealed primary fan as described above.

[0015] By means of the above technical solution, the present application connects an exhaust pipe to the shaft sealing cover on the inlet air duct of the primary fan, and the shaft sealing cover is installed around the side surface of the fan shaft to seal the gap between the fan shaft and the impeller volute, and the shaft is encapsulated with a shell made of PVC material. It can be seen that, driven by the centrifugal force generated by the primary fan, a strong negative pressure is applied to the inlet air duct, and the negative pressure suction force is transmitted to the shaft sealing cover located at the gap between the suction shaft and the impeller volute through the exhaust pipe, thereby effectively absorbing the odor in the gap between the shaft and the impeller volute and the heat emitted by the shaft, thereby ensuring the stable operation of the primary fan. Furthermore, the sealing effect is effectively extended by the negative pressure self-sealing method at the gap between the primary fan shaft and the impeller volute. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0017] Figure 1 A structural schematic diagram of a sealed primary fan provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the structure of a waste-to-energy system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] Figure 1 A structural schematic diagram of a sealed primary fan provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the structure of the sealed primary fan may include:

[0021] Fan inlet duct, fan shaft, impeller volute, fan outlet duct and sealing components.

[0022] Specifically, the sealing component may include an exhaust pipe and a rotating shaft sealing cover.

[0023] The fan inlet air duct is connected to the shaft sealing cover through the exhaust duct. The shaft sealing cover is installed around the side surface of the fan shaft to seal the gap between the fan shaft and the impeller volute.

[0024] It can be understood that after a fan is started, the motor drives the impeller to rotate at a high speed. The impeller is composed of multiple blades, and a gas flow channel is formed between the blades. As the impeller rotates, the gas is driven by the blades to perform circular motion. When the impeller rotates, the gas constantly changes its direction and speed under the action of the blades. Due to the high speed of the impeller, the gas obtains a large acceleration in a very short time, thereby producing a centrifugal trend. The centrifugal force formed causes the gas to move outward along the radius of the impeller and be discharged from the periphery of the impeller volute. The gas obtains kinetic energy under the action of centrifugal force. After being discharged from the periphery of the impeller, it is guided by the impeller volute to flow along the fan outlet duct to the fan outlet. Therefore, when the primary fan generates centrifugal force, a strong negative pressure is applied to the inlet air duct. The negative pressure suction is transmitted to the shaft sealing cover located at the gap between the suction shaft and the impeller volute through the exhaust duct, thereby effectively absorbing the odor in the gap between the shaft and the impeller volute and the heat emitted by the shaft, avoiding the temperature increase caused by poor heat dissipation of the primary fan shaft, and ensuring the stable operation of the primary fan.

[0025] Furthermore, the exhaust pipe can be made of PVC material, and the shaft sealing cover can be made of PVC material, avoiding the use of traditional alloy materials as sealing materials. The cost is low, and the sealing effect can be effectively extended through negative pressure self-sealing at the gap between the fan shaft and the impeller volute.

[0026] The sealed primary fan provided in this embodiment is connected to the shaft sealing cover through an exhaust pipe on the inlet air duct of the primary fan. The shaft sealing cover is installed around the side surface of the fan shaft to seal the gap between the fan shaft and the impeller volute, and the shaft is encapsulated with a shell made of PVC material. It can be seen that, driven by the centrifugal force generated by the primary fan, a strong negative pressure is applied to the inlet air duct, and the negative pressure suction force is transmitted to the shaft sealing cover located at the gap between the suction shaft and the impeller volute through the exhaust pipe, thereby effectively absorbing the odor in the gap between the shaft and the impeller volute and the heat emitted by the shaft, thereby ensuring the stable operation of the primary fan. Furthermore, the sealing effect is effectively extended by the negative pressure self-sealing method at the gap between the primary fan shaft and the impeller volute.

[0027] In some embodiments of the present application, the fan shaft mentioned in the above embodiments is introduced. The fan shaft can be a cylinder. Since the shaft sealing cover is installed around the side surface of the fan shaft, it can be seen that the fan shaft is embedded in the hollow part of the shaft sealing cover, so the structure of the shaft sealing cover can be a hollow cylinder.

[0028] It is understandable that the fan shaft adopts a cylindrical structure, which can ensure that the shaft is evenly stressed when rotating at high speed, reduce fatigue damage and deformation caused by excessive local stress, and thus extend the service life of the shaft. The mass distribution of the cylinder is relatively symmetrical, and its moment of inertia is relatively uniform in all directions, thereby increasing more sufficient centrifugal force. When subjected to external interference, it can better maintain a balanced state.

[0029] Furthermore, since the structure of the rotating shaft sealing cover is a hollow cylinder, the exhaust pipe is connected to the side surface of the rotating shaft sealing cover. Figure 1 shown.

[0030] The exhaust pipe can be connected to a position of the fan shaft close to the impeller volute.

[0031] Specifically, the exhaust pipe can be a structure in which two cylindrical pipes are spliced ​​at right angles, such as Figure 1 As shown, one of the right angle sides is connected to the fan inlet air duct, and the other right angle side is connected to the side surface of the shaft sealing cover. In addition, the exhaust pipe can also be a curved pipe structure, with one end connected to the fan inlet air duct and the other end connected to the side surface of the shaft sealing cover. The exhaust pipe can also be a straight pipe structure or other structures, with the two ends respectively connected to the fan inlet air duct and the side surface of the shaft sealing cover.

[0032] Furthermore, the outer shell of the fan shaft is attached with PVC material to replace the traditional alloy material, reducing the cost of the sealing ring. This effectively avoids the phenomenon that the physical properties of the traditional alloy material will be significantly degraded at high temperatures, and also avoids the accelerated aging of the traditional alloy material due to environmental factors (such as humidity, chemical corrosive gases, acidic gases, etc.), which reduces its service life.

[0033] In some embodiments of the present application, based on the sealed primary fan mentioned in the above embodiments, a garbage power generation system is proposed. Specifically, Figure 2 A schematic diagram of a waste-to-energy system provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the structure of the waste-to-energy system may include a sealed primary fan.

[0034] It is understandable that the burning of garbage in the incinerator requires sufficient oxygen to support the chemical reaction. The sealed primary fan is responsible for transporting external air into the incinerator so that the garbage can be fully burned and release heat, which in turn heats the water into steam and drives the turbine to rotate and generate electricity. In addition, a large amount of odor will be generated in the garbage storage pit. The sealed primary fan extracts the air in the garbage bin to keep the garbage bin in a negative pressure state to prevent the odor from overflowing. At the same time, the odor-containing air is transported to the incinerator for combustion treatment to achieve the deodorization effect and reduce pollution to the surrounding environment. The air transported by the sealed primary fan can provide combustion support for the combustion of garbage, making the garbage burn more fully and improving the combustion efficiency, thereby increasing the power generation of the garbage power generation system and improving the energy utilization efficiency of the entire system.

[0035] Furthermore, the waste-to-energy system may also include a thermal system. In terms of the thermal operation of the waste-to-energy system, the operating condition of the sealed primary fan directly affects the thermal system in the waste-to-energy system. If the sealed primary fan does not supply enough air, it will lead to incomplete combustion, reduce the amount of steam generated by the waste heat boiler and reduce its quality, which will in turn affect the power generation capacity of the steam turbine generator set; on the contrary, if the sealed primary fan supplies too much air, it may cause the temperature in the incinerator to be too high, affecting the service life of the equipment, and at the same time increase the heat loss of the flue gas and reduce the thermal efficiency of the system. Therefore, the sealed primary fan can adjust the air supply and accurately control the amount of air entering the incinerator according to factors such as the type and calorific value of the garbage, to ensure the smooth progress of the combustion process, reduce the unstable combustion caused by unstable air supply, and thus cause equipment failures and energy waste, so as to stabilize the combustion conditions.

[0036] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealed primary fan, characterized in that: It includes a fan inlet duct, a fan shaft, an impeller volute, a fan outlet duct and a sealing component; The sealing component includes an exhaust pipe and a shaft sealing cover. The fan inlet air pipe is connected to the shaft sealing cover through the exhaust pipe. The shaft sealing cover is installed around the side surface of the fan shaft to seal the gap between the fan shaft and the impeller volute.

2. The sealed primary fan according to claim 1, characterized in that: The fan shaft is a cylinder, the shaft sealing cover is a hollow cylinder, and the fan shaft is embedded in the hollow part of the shaft sealing cover.

3. The sealed primary fan according to claim 2, characterized in that: The exhaust pipe is connected to the side surface of the rotating shaft sealing cover.

4. The sealed primary fan according to claim 2, characterized in that: The outer shell of the fan shaft is attached with PVC material.

5. The sealed primary fan according to any one of claims 1 to 4, characterized in that: The exhaust pipe is made of PVC material.

6. The sealed primary fan according to any one of claims 1 to 4, characterized in that: The material of the rotating shaft sealing cover is PVC material.

7. A garbage power generation system, characterized in that: It comprises a sealed primary fan as described in any one of claims 1 to 6.

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