Pipeline conveying device and method for conveying waste incineration fly ash

Abstract

The present invention belongs to the technical field of stabilization treatment of fly ash from waste incineration power generation, and relates to a pipeline conveying device and method for conveying fly ash from waste incineration. The pipeline conveying device includes a fly ash conveying pipeline and a screw pump and a baler connected to both ends of the fly ash conveying pipeline, and the screw pump is arranged at one end close to the fly ash stabilization room and connected to the mixer discharge valve of the mixer in the fly ash stabilization room, and the baler is arranged at one end close to the fly ash curing room; an air injection system is connected to the end of the fly ash conveying pipeline close to the screw pump, so that the air injection system can blow compressed air in both directions along the axial direction of the fly ash conveying pipeline or blow compressed air in a direction perpendicular to the fly ash conveying pipeline; the fly ash conveying pipeline is also provided with a lubrication injection system for injecting lubricant into the fly ash conveying pipeline, and the lubrication injection system is arranged on the side of the air injection system close to the screw pump.

Description

Technical Field

[0001] The invention belongs to the technical field of stabilization treatment of fly ash from garbage incineration power generation, and relates to a pipeline conveying device and method for conveying fly ash from garbage incineration. Background Art

[0002] Waste incineration fly ash is a byproduct of municipal solid waste incineration. It is a light, fine-particle powder collected from flue gas ducts, flue gas purification systems, cyclones, and bag filters. It is rich in organic pollutants such as benzopyrene, benzanthracene, and dioxins, as well as heavy metals such as Cr, Cd, Hg, Pb, Cu, and Ni. Therefore, it is consistently listed as a hazardous waste in the National List of Hazardous Wastes, and its transportation and disposal are subject to extremely strict supervision and control. Fly ash is an inevitable byproduct of waste incineration. Incinerator fly ash is primarily composed of inorganic matter, followed by heavy metals with high leaching rates, and a certain amount of dioxins adsorbed in the fly ash. Direct landfill without pretreatment will cause heavy metals to leach and migrate, causing secondary contamination of soil and groundwater. Fly ash consists of the material captured by the waste incineration flue gas purification system and the bottom ash that settles from the flue. Fly ash must undergo necessary stabilization and solidification treatment at the source before it can be transported.

[0003] The "Technical Specifications for Municipal Waste Incineration Treatment Engineering" require that all devices in fly ash collection, storage, and treatment systems be kept sealed. Existing fly ash from municipal waste incineration power plants is typically transported, stored, and then chelated in a mixer in a fly ash stabilization room. The chelated fly ash is then packaged into ton bags using a baler. These bags are then transported by truck to a fly ash curing room for curing and storage. However, the harsh transportation environment for fly ash by truck poses a certain risk to the health of workers and the environment, as well as the risk of fly ash scattering and impacting the environment.

[0004] Therefore, it is necessary to propose a new device and method for conveying fly ash from waste incineration to replace the manual transfer process from the fly ash stabilization room to the fly ash curing room, and reduce the dust impact of transfer and bulk fly ash. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a pipeline conveying device and method for conveying fly ash from waste incineration, which adopts fly ash conveying pipeline to transport fly ash instead of the manual transportation process from the fly ash stabilization room to the fly ash curing room, while reducing the dust impact of transportation and bulk fly ash, which can effectively improve the factory environment and protect the health of workers.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A pipeline conveying device for conveying fly ash from waste incineration, the pipeline conveying device being arranged between a fly ash stabilization room and a fly ash curing room, comprising a fly ash conveying pipeline and a screw pump and a baler connected to both ends of the fly ash conveying pipeline, wherein the screw pump is arranged at one end close to the fly ash stabilization room and connected to a mixer discharge valve of a mixer in the fly ash stabilization room, and the baler is arranged at one end close to the fly ash curing room;

[0008] An air injection system is connected to one end of the fly ash conveying pipeline close to the screw pump, so that the air injection system can spray compressed air in both directions along the axial direction of the fly ash conveying pipeline or in a direction perpendicular to the fly ash conveying pipeline;

[0009] The fly ash conveying pipeline is also provided with a lubrication injection system for injecting lubricant into the fly ash conveying pipeline, and the lubrication injection system is arranged on a side of the air injection system close to the screw pump.

[0010] Furthermore, the fly ash curing room is also provided with an electric hoist connected to the baler to lift the ton bags after the baling by the baler to a designated location.

[0011] Furthermore, the air injection system includes at least two air injection ports tangentially connected to the fly ash conveying pipeline, and a part of the air injection ports are arranged opposite to another part of the air injection ports to inject compressed air in two directions along the axial direction of the fly ash conveying pipeline.

[0012] Furthermore, the air injection system includes at least one air injection port vertically connected to the fly ash conveying pipeline to spray compressed air in a direction perpendicular to the fly ash conveying pipeline.

[0013] Furthermore, the pipe between the screw pump and the air injection system in the fly ash conveying pipeline is a straight pipe, and the capacity of this section of the straight pipe matches the capacity of the ton bag in the baler.

[0014] Furthermore, the pipeline conveying device also includes a PLC automation control module, and the air injection system, mixing mixer, screw pump and baler are all connected to the PLC automation control module to achieve automatic control of the pipeline conveying device.

[0015] A pipeline transportation method for conveying fly ash from garbage incineration, using the pipeline transportation device for conveying fly ash from garbage incineration using compressed air, specifically comprises the following steps:

[0016] a. After chelation and stabilization in the mixer, the fly ash enters the mixer through the discharge valve and the screw pump connected to the mixer discharge valve;

[0017] b. The chelated and stabilized fly ash enters the fly ash conveying pipeline under the action of the screw pump;

[0018] c. The air injection system injects compressed air perpendicular to the fly ash conveying pipeline or injects compressed air in two directions along the axial direction of the fly ash conveying pipeline, forming a compressed air cut-off point. As the screw pump continuously conveys fly ash into the fly ash conveying pipeline, the fly ash between the screw pump and the compressed air cut-off point is compacted;

[0019] d. Pause the air injection system to inject compressed air into the fly ash conveying pipeline, use the screw pump to advance the compacted fly ash to the compressed air cut-off point, then restart the air injection system to inject compressed air into the fly ash conveying pipeline to cut off the compacted fly ash, and use the compressed air as power to transport the cut-off fly ash to the baler for baling, while simultaneously carrying out the next stage of fly ash compaction between the screw pump and the compressed air cut-off point;

[0020] e. Repeat the above steps until the chelated and stabilized fly ash is transferred between the fly ash stabilization room and the fly ash curing room.

[0021] Furthermore, in step d, the lubricant injection system injects lubricant into the fly ash conveying pipeline.

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

[0023] The present invention provides a pipeline conveying device and method for conveying fly ash from waste incineration. The fly ash is transported through a fly ash conveying pipeline to replace the manual transportation process from a fly ash stabilization room to a fly ash curing room, while reducing the dust impact of transportation and bulk fly ash, effectively improving the factory environment and ensuring the health of workers.

[0024] Secondly, the pipeline conveying device uses a screw pump and an air injection system connected to the fly ash conveying pipeline to control the flow of fly ash. The screw pump continuously feeds fly ash into the fly ash conveying pipeline. Once the fly ash between the screw pump and the compressed air cutoff point (where compressed air vertically enters the fly ash conveying pipeline) is properly compacted, the compressed air injection is stopped. The force exerted by the fly ash compression at the screw pump outlet propels the compacted fly ash forward to beyond the compressed air cutoff point (away from the screw pump). The compressed air is then resumed to cut off the compacted fly ash. This cutoff compressed air serves as power to transport the cutoff fly ash to the baler, while simultaneously carrying out the next stage of fly ash compaction between the screw pump and the compressed air cutoff point. This operation compresses and cuts the fly ash into small segments compatible with the baler. The fly ash is then fed into the baler using the pressure differential between the compressed air and the baler inlet (at atmospheric pressure). This reduces the impact of dust from both transfer and bulk handling of fly ash, while improving both transfer and baling efficiency.

[0025] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0027] Figure 1 Schematic diagram of the structure of a pipeline conveying device for conveying fly ash from waste incineration in an embodiment.

[0028] Reference numerals: screw pump 1 , fly ash conveying pipeline 2 , baler 3 , air injection system 4 , lubrication injection system 5 , mixer discharge valve 6 , mixer 7 . DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Example 1

[0033] See also Figure 1 , is a pipeline conveying device for conveying fly ash from waste incineration by using compressed air. The pipeline conveying device is arranged between the fly ash stabilization room and the fly ash curing room, and includes a fly ash conveying pipeline 2 and a screw pump 1 and a baler 3 connected to both ends of the fly ash conveying pipeline 2. The screw pump 1 is arranged at one end close to the fly ash stabilization room and connected to the discharge port of the mixing mixer 7 in the fly ash stabilization room. The baler 3 is arranged at one end close to the fly ash curing room; an air injection system 4 is connected to the end of the fly ash conveying pipeline 2 close to the screw pump 1, so that the air injection system 4 can blow compressed air in both directions along the axial direction of the fly ash conveying pipeline 2 or blow compressed air in a direction perpendicular to the fly ash conveying pipeline 2.

[0034] The pipeline conveying device also includes a mixer discharge valve 6 connected between the mixer 7 and the screw pump 1. The fly ash conveying pipeline 2 is also equipped with a lubrication injection system 5 for injecting lubricant into the fly ash conveying pipeline 2. The lubrication injection system 5 is arranged on the side of the air injection system 4 close to the screw pump 1. The fly ash curing room is also equipped with a crane connected to the baler 3 to lift the completed ton bags to a designated location.

[0035] Preferably, the pipeline conveying device further includes a PLC automation control module, and the air injection system 4, the mixing mixer 7, the screw pump 1 and the baler 3 are all connected to the PLC automation control module to achieve automated control of the pipeline conveying device.

[0036] Specifically, the air injection system 4 includes at least one air jet vertically connected to the fly ash conveying pipeline 2 to spray compressed air in a direction perpendicular to the fly ash conveying pipeline 2. In this embodiment, there is only one air jet. After the compressed air is vertically injected into the fly ash conveying pipeline 2 through the air jet, it is dispersed to both sides due to the obstruction of the pipeline wall, thereby simultaneously compacting the fly ash on the side near the screw pump 1 and transporting the fly ash on the side near the baler 3.

[0037] The mixing mixer 7 is arranged directly below the fly ash bin. The mixing mixer 7 adopts the upper-in and lower-out feeding and discharging form and is provided with an operating platform. It has two feeding ports: a fly ash feeding port and a water feeding port, and one exhaust port, and the exhaust port is connected to the water film dust collector through a PVC pipe. The motor protection level of the mixing mixer 7 is not lower than IP55. The motor and reducer should be provided with protective plates and must not be directly exposed to the outside. The mixing mixer 7 has two inspection and discharge ports, one in the front and one in the back, which are used to remove the residue in the mixing mixer 7. There is no grille in the inspection port. A mixing mixer discharge valve 6 is provided under the discharge port of the mixing mixer 7. A sealing structure is provided between the mixing mixer 7 and the screw pump 1 to prevent fly ash from scattering. A water film dust collector is used in the mixing mixer 7 area to collect and treat water vapor, dust, etc.

[0038] The air injection system 4 includes an air jet and an air pipe connected to the air jet. The air pipe is provided with a solenoid valve connected to a PLC control module, and the air source is compressed air from the factory. The pipe between the screw pump 1 and the air injection system 4 in the fly ash conveying pipeline 2 is a straight pipe, and the air jet is vertically connected to the fly ash conveying pipeline 2. Compressed air is injected into the fly ash conveying pipeline 2 to cut off the fly ash on the straight section of the screw pump 1 outlet, forming a compressed air cut-off point. As the screw pump 1 continuously conveys fly ash into the pipeline, the fly ash between the screw pump 1 and the compressed air cut-off point is compacted, and the compressed air injection is cut off. The power of the fly ash squeezed at the screw pump 1 outlet is used to push the compacted fly ash forward to the side behind the compressed air cut-off point (away from the screw pump 1), and then the compressed air is opened to cut off the compacted fly ash. The cut-off compressed air is used as power to deliver the cut-off fly ash to the baler 3, and the next stage of fly ash compaction between the screw pump 1 and the compressed air cut-off point is carried out simultaneously. In this embodiment, the fly ash at the outlet of the screw pump 1 is transported using the factory's public compressed air, which can reduce the outlet pressure of the screw pump 1, reduce pipeline costs and energy consumption, and reduce on-site pipeline installation costs.

[0039] Specifically, the hopper of the screw pump 1 features a material level control system that automatically adjusts the pump speed based on the incoming material volume. The screw pump 1 also implements variable frequency control to adjust the delivery volume per unit time. The lubricant injection system 5 is connected to the fly ash delivery pipeline 2 to deliver lubricant directly to the pipeline, ensuring the normal and stable delivery of fly ash. This lubricant injection system 5 is a readily available lubricant injection system 5 in the prior art and is therefore not described in detail.

[0040] An automatic baler 3 is installed in the fly ash curing room. After baling, the balers are moved to the designated curing area via an electric hoist or crane in the fly ash curing room. Baler 3 requirements include the ability to hang ton bags at an adjustable height; a sealable connection between the ton bag outlet and the ton bag, with a pressure control system ensuring close contact between the ton bag receiving port and the equipment; a manual ladder and a platform for manually cleaning the baler 3 hopper are required; the bag hanging hook is electrically and pneumatically released and automatically reset; and the bag clamping device is electrically and pneumatically clamped and released. The double-station conveyor is electrically and pneumatically operated, automatically stopping upon reaching its designated position. The ash outlet and feed hopper are equipped with electric hammer vibration functions.

[0041] After the fly ash has been transported by chelation, it can be emptied from the fly ash conveying pipeline 2 without accumulation, thus preventing internal agglomeration and blockage. This embodiment uses a PLC control module as the control system. The mixer 7, mixer discharge valve 6, screw pump 1, lubricant injection system 5, air injection system, and baler 3 are all connected to the PLC control module, enabling pressure and flow monitoring throughout the fly ash conveying process. It can also control the flow (fly ash, lubricant) and compressed air injection volume, as well as monitor the fly ash level, achieving automated control.

[0042] A method for transporting waste incineration fly ash using compressed air, specifically comprising the following steps:

[0043] a. A mixer discharge valve 6 is provided at the discharge port of the mixer 7 in the fly ash stabilization workshop so that the fly ash after chelation stabilization in the mixer 7 enters the screw pump 1 connected to the mixer discharge valve 6 through the mixer discharge valve 6;

[0044] b. The chelated and stabilized fly ash enters the fly ash conveying pipe 2 under the action of the screw pump 1;

[0045] c. The air injection system injects compressed air perpendicular to the fly ash conveying pipeline 2 into the fly ash conveying pipeline 2, forming a compressed air cut-off point. As the screw pump 1 continuously conveys fly ash into the fly ash conveying pipeline 2, the fly ash between the screw pump 1 and the compressed air cut-off point is compacted;

[0046] d. Pause the air injection system to inject compressed air into the fly ash conveying pipe 2, use the screw pump 1 to push the compacted fly ash forward to the compressed air cut-off point, then restart the air injection system to inject compressed air into the fly ash conveying pipe 2 to cut off the compacted fly ash. Use the compressed air as power to deliver the cut-off fly ash to the baler 3, and simultaneously carry out the next stage of fly ash compaction between the screw pump 1 and the compressed air cut-off point;

[0047] e. Repeat the above steps until the chelated and stabilized fly ash is transferred between the fly ash stabilization room and the fly ash curing room.

[0048] Preferably, in step d, the lubricant injection system 5 injects lubricant into the fly ash conveying pipeline 2 to prevent the fly ash conveying pipeline 2 from having excessive conveying resistance and severe wear.

[0049] Preferably, in step c, the pipe in the fly ash conveying pipeline 2 between the screw pump 1 and the compressed air cut-off point is a straight pipe, and the capacity of this section of the straight pipe matches the capacity of the ton bag in the baler 3, so that the capacity of the compacted fly ash after the compressed air cut-off point matches the capacity of the ton bag in the baler 3.

[0050] Example 2

[0051] The difference between this embodiment and embodiment 1 is that the air injection system 4 includes at least two air injection ports tangentially connected to the fly ash conveying pipeline 2, and a part of the air injection ports are arranged opposite to another part of the air injection ports to spray compressed air in two directions along the axial direction of the fly ash conveying pipeline 2.

[0052] In this embodiment, there are two air jets, and the timing of controlling the compressed air injection is the same as in Example 1. The difference is that the compressed air is directly injected in two directions along the axial direction of the fly ash conveying pipe 2 from the air jets, thereby avoiding the energy loss caused by the compressed air colliding with the pipe wall, thereby enhancing the compaction of the fly ash and the transmission speed after the fly ash is cut off.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A pipeline transportation method for transporting fly ash from garbage incineration, characterized in that: A pipeline conveying device for conveying fly ash from garbage incineration is provided. The pipeline conveying device is arranged between a fly ash stabilization room and a fly ash curing room, and comprises a fly ash conveying pipeline (2) and a screw pump (1) and a baler (3) connected to both ends of the fly ash conveying pipeline (2). The screw pump (1) is arranged at one end close to the fly ash stabilization room and connected to a mixer discharge valve (6) of a mixer (7) in the fly ash stabilization room. The baler (3) is arranged at one end close to the fly ash curing room. An air injection system (4) is connected to one end of the fly ash conveying pipeline (2) close to the screw pump (1), so that the air injection system (4) can spray compressed air in both directions along the axial direction of the fly ash conveying pipeline (2) or in a direction perpendicular to the fly ash conveying pipeline (2); The fly ash conveying pipeline (2) is also provided with a lubricant injection system (5) for injecting lubricant into the fly ash conveying pipeline (2), and the lubricant injection system (5) is arranged on a side of the air injection system (4) close to the screw pump (1); The pipeline transportation method specifically comprises the following steps: a. The fly ash after chelation stabilization in the mixer (7) enters the screw pump (1) connected to the mixer discharge valve (6) through the mixer discharge valve (6); b. The chelated and stabilized fly ash enters the fly ash conveying pipeline (2) under the action of the screw pump (1); c. The air injection system (4) injects compressed air perpendicular to the fly ash conveying pipeline (2) or injects compressed air bidirectionally along the axial direction of the fly ash conveying pipeline (2) into the fly ash conveying pipeline (2), and forms a compressed air cut-off point. As the screw pump (1) continuously conveys fly ash into the fly ash conveying pipeline (2), the fly ash between the screw pump (1) and the compressed air cut-off point is compacted; d. Pause the air injection system (4) to inject compressed air into the fly ash conveying pipe (2), use the screw pump (1) to push the compacted fly ash forward to the compressed air cut-off point, then open the air injection system (4), inject compressed air into the fly ash conveying pipe (2) to cut off the compacted fly ash, and use the compressed air as power to transport the cut-off fly ash to the baler (3) for baling, and simultaneously carry out the next stage of fly ash compaction between the screw pump (1) and the compressed air cut-off point; e. Repeat the above steps until the chelated and stabilized fly ash is transferred between the fly ash stabilization room and the fly ash curing room.

2. The pipeline transportation method for transporting waste incineration fly ash according to claim 1 is characterized in that: The fly ash curing room is also provided with an electric hoist connected to the baler (3) to lift the ton bags after baling by the baler (3) to a designated location.

3. The pipeline transportation method for transporting waste incineration fly ash according to claim 1 is characterized in that: The air injection system (4) comprises at least two air injection ports tangentially connected to the fly ash conveying pipeline (2), and a portion of the air injection ports is arranged opposite to another portion of the air injection ports, so as to bidirectionally inject compressed air in the axial direction of the fly ash conveying pipeline (2).

4. The pipeline transportation method for transporting waste incineration fly ash according to claim 1 is characterized in that: The air injection system (4) comprises at least one air injection port vertically connected to the fly ash conveying pipeline (2) for spraying compressed air in a direction perpendicular to the fly ash conveying pipeline (2).

5. The pipeline transportation method for transporting waste incineration fly ash according to claim 1 is characterized in that: The pipe in the fly ash conveying pipe (2) between the screw pump (1) and the air injection system (4) is a straight pipe, and the capacity of this section of the straight pipe matches the capacity of the ton bag in the baler (3).

6. The pipeline transportation method for transporting waste incineration fly ash according to claim 1, characterized in that: The pipeline conveying device further comprises a PLC automation control module, and the air injection system (4), the mixing mixer (7), the screw pump (1) and the baler (3) are all connected to the PLC automation control module to achieve automated control of the pipeline conveying device.

7. The pipeline transportation method for transporting waste incineration fly ash according to claim 1, characterized in that: In step d, the lubricant injection system (5) injects lubricant into the fly ash conveying pipeline (2).

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