Pneumatic ash conveying system of thermal power plant
By setting up ash collection device and sub-pipes in each sub-region of the thermal power plant, and connecting the mother pipes only with the sub-pipes in the sub-region with a large amount of ash discharge, the problem of ash blockage in the mother pipes during high-load operation is solved, and a stable and efficient ash transmission system is achieved.
Patent Information
- Application Number
- CN202421349137.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-06-13
AI Technical Summary
During the high load operation of thermal power plants, the large amount of ash output of individual ash delivery units leads to ash blockage of ash from the ash discharge mother pipe. The traditional method cannot effectively solve this problem when multiple mother pipes are under high load.
A pneumatic ash delivery system for thermal power plants is designed, and the ash collection device and sub-pipes are set up in each sub-region, and the mother pipe is connected only to the sub-pipes in the sub-region with a large amount of ash discharge to achieve independent ash discharge.
It effectively reduces the risk of ash blockage in the mother pipeline, ensures the stability of the ash cycle and time, improves the ash efficiency, and reduces the wear rate and mechanical damage of the ash pipeline.
Smart Images
Figure CN222808888U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of ash conveying in thermal power plants, and in particular to a pneumatic ash conveying system in a thermal power plant. Background Art
[0002] Thermal power plants usually include multiple sub-fields, each with different ash conveying units. Traditional power plants usually connect the ash discharge branch pipes of multiple ash conveying units to the same ash discharge main pipe, and then discharge ash uniformly through the ash discharge main pipe.
[0003] During high-load, high-coal-flow operation of thermal power plant units, when individual ash handling units discharge large amounts of ash, the ash discharge pressure of their corresponding main pipes increases, leading to ash blockage within the main pipes and elevated hoppers in the ash handling units. To ensure normal ash discharge from the power plant during high-load periods, valves can be switched to selectively connect some of the ash discharge branches corresponding to the main pipes with higher ash discharge pressure to other main pipes for ash discharge. While this design can address the ash discharge problem to a certain extent, it cannot be resolved by switching valves when all the main pipes in a thermal power plant are operating at high load. Utility Model Content
[0004] The purpose of the present disclosure is to provide a pneumatic ash conveying system for a thermal power plant to at least partially solve the problems existing in the related art.
[0005] To achieve the above objectives, the present disclosure provides a pneumatic ash conveying system for a thermal power plant, wherein the thermal power plant includes an ash storage and multiple sub-areas. The pneumatic ash conveying system for the thermal power plant includes:
[0006] A plurality of ash collecting devices, at least one of which is provided in each of the sub-areas;
[0007] A plurality of sub-pipes, wherein the ash collecting devices in each of the sub-areas are connected in series via corresponding sub-pipes, so that the sub-pipes receive the ash in the corresponding ash collecting devices;
[0008] Multiple main pipes, one end of which is connected to the ash storage and the other end is connected to the corresponding sub-pipes; and
[0009] The air source is used to discharge the ash in the ash collecting device to the ash storage via the corresponding sub-pipeline and the corresponding main pipe,
[0010] Wherein, at least two of the mother pipes are connected to only one of the child pipes.
[0011] Optionally, at least three of the mother pipes are connected to only one of the child pipes.
[0012] Optionally, the thermal power plant also includes an economizer, and at least one ash collecting device is respectively provided on the first side and the second side of the economizer, and the ash collecting devices on the first side and the second side are respectively connected in series through corresponding sub-pipelines so that the sub-pipelines receive the ash in the corresponding ash collecting devices.
[0013] Optionally, the sub-pipes of the first side, the second side, and at least one of the sub-areas are connected to the same main pipe.
[0014] Optionally, the sub-pipelines of at least two of the sub-areas are connected to the same main pipe.
[0015] Optionally, each of the ash collecting devices includes an ash hopper and a silo pump, and the silo pump is connected between the ash hopper and the corresponding sub-pipeline to discharge the ash in the ash hopper to the corresponding sub-pipeline.
[0016] Optionally, a first valve is provided between the silo pump and the ash hopper, a second valve is provided between the silo pump and the sub-pipeline, and the silo pump is provided with an exhaust valve.
[0017] The gas source is connected to a position of the sub-pipe away from the corresponding main pipe through a first gas pipe, the silo pump is connected to the gas source, and a third valve is provided on the first gas pipe.
[0018] Optionally, the gas source is connected to a position of the sub-pipe close to the corresponding main pipe through a second gas pipe, and a fourth valve is provided on the second gas pipe.
[0019] Optionally, each of the silo pumps is provided with a pressure sensor connected to the fourth valve.
[0020] Optionally, an electrostatic device is further included on the ash hopper.
[0021] Through this technical solution, the two main pipes are connected only to the sub-pipes in the sub-areas of the electric field with the highest ash discharge volume, allowing for independent ash discharge from these areas, effectively reducing the risk of ash blockage in the main pipes. Furthermore, if sub-pipes in other sub-areas become blocked, the blocked sub-pipes can be connected to the main pipe operating at a lower load, ensuring a consistent ash conveying cycle and time. This improves ash conveying efficiency and reduces pipe wear. The reduced frequency of ash conveying significantly reduces mechanical damage to the pneumatic ash conveying equipment.
[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0024] Figure 1 and Figure 2 They are respectively schematic diagrams of partial structures of a thermal power plant provided by exemplary embodiments of the present disclosure.
[0025] Description of Reference Numerals
[0026] 1-ash collection device; 11-ash hopper; 12-silo pump; 2-sub-pipeline; 3-main pipeline; 4-gas source; 5-ash storage; 6-sub-area; 7-economizer; 71-first side; 72-second side; 81-first valve; 82-second valve; 83-third valve; 84-fourth valve; 85-exhaust valve; 91-first air pipe; 92-second air pipe DETAILED DESCRIPTION
[0027] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.
[0028] In this disclosure, unless otherwise indicated, directional terms such as "inner" and "outer" refer to the outlines of the corresponding components. Terms such as "first" and "second" are used to distinguish one element from another and do not imply order or importance. In addition, in the following description, when referring to the drawings, the same reference numerals in different drawings indicate the same or similar elements.
[0029] Reference Figure 1 and Figure 2 The present disclosure provides a pneumatic ash conveying system for a thermal power plant, which can be Figure 1 The A side of the dust removal is shown and the Figure 2On the ash removal B side shown, the thermal power plant may include an ash storage 5 and multiple sub-areas 6. In the present disclosure, a thermal power plant may include one electric field, two electric fields, three electric fields, four electric fields, five electric fields and an economizer 7, etc. The following disclosure will expand on the example of a thermal power plant including an economizer 7 and one to five electric fields. It should also be noted that in the present disclosure, taking one electric field as an example, one electric field may include one electric field A unit and one electric field B unit, etc., wherein one electric field A unit may be referred to as a sub-area 6. The pneumatic ash conveying system of a thermal power plant may include an ash collecting device 1, a sub-pipeline 2, a main pipeline 3 and an air source 4. The number of ash collecting devices 1 may be multiple, and at least one ash collecting device 1 may be provided in each sub-area 6 to meet the ash collection needs of each sub-area 6. The number of sub-pipes 2 can also be multiple, and the ash collecting device 1 in each sub-area 6 is connected in series through the corresponding sub-pipes 2, so that the sub-pipes 2 receive the ash in the corresponding ash collecting device 1. In this way, the ash in the sub-area 6 is collected in a targeted manner into the corresponding ash collecting device 1 through the sub-pipes 2, ensuring the ash collection accuracy of the sub-area 6. The number of mother pipes 3 can also be set to multiple accordingly. One end of the mother pipe 3 can be connected to the ash bin 5, and the other end of the mother pipe 3 can be connected to the corresponding sub-pipes 2 to transport the ash received by the sub-pipes 2 to the ash bin 5 respectively to avoid blockage. The air source 4 can be used to discharge the ash in the ash collecting device 1 to the ash bin 5 via the corresponding sub-pipes 2 and the corresponding mother pipes 3 to provide output power for the ash, thereby ensuring the adequacy and stability of the ash discharge of the mother pipe 3. In the embodiment provided in the present disclosure, at least two mother pipes 3 are only connected to one sub-pipe 2, such as Figure 1 and Figure 2 In the embodiment shown, when the ash discharge volume of the electric field unit 2 and the electric field unit 1 is large, one mother pipe 3 is only connected to the sub-pipe 2 in the electric field unit 2, and another mother pipe 3 is only connected to the sub-pipe 2 of the electric field unit 1. This can effectively ensure the smoothness of the ash transportation of the mother pipe 3 and avoid ash blockage.
[0030] Through the above technical solution, the two main pipes 3 are connected only to the sub-pipes 2 in the sub-areas 6 of the electric field with the largest ash discharge volume, allowing for independent ash discharge from these areas, effectively reducing the risk of ash blockage in the main pipes 3. Furthermore, if the sub-pipes 2 in other sub-areas 6 become blocked, the blocked sub-pipes 2 can be connected to the main pipe 3 operating at a lower load, ensuring the ash conveying cycle and time, thereby improving ash conveying efficiency and reducing the wear rate of the ash conveying pipes. The reduced ash conveying frequency significantly reduces mechanical damage to the pneumatic ash conveying equipment.
[0031] To further enhance the ash conveying capacity of the ash conveying system, in some embodiments, at least three main pipelines 3 may be connected to only one sub-pipeline 2. Specifically, the sub-pipelines 2 in the three sub-areas 6 with the highest ash discharge pressure within the thermal power plant may each be associated with a single main pipeline 3, with this main pipeline 3 not connected to any other sub-pipelines 2. Furthermore, in other embodiments, the sub-pipelines 2 in the remaining four or five sub-areas 6 may each be associated with a single main pipeline 3.
[0032] Reference Figure 1 and Figure 2 In some embodiments provided in the present disclosure, the thermal power plant may further include an economizer 7, and the first side 71 and the second side 72 of the economizer 7 may be respectively provided with at least one ash collecting device 1, and the ash collecting devices 1 of the first side 71 and the second side 72 may be respectively connected in series through corresponding sub-pipes 2, so that the sub-pipes 2 receive the ash in the corresponding ash collecting device 1, thereby discharging the coal ash of the first side 71 and the second side 72 to the ash collecting device 1 through the corresponding sub-pipes 2, so as to be discharged to the external ash storage 5 through the ash collecting device 1.
[0033] The sub-pipelines 2 of the first side 71, the second side 72, and at least one sub-area 6 are connected to the same main pipe 3. In the embodiments provided herein, in actual operation, the sub-area 6 with lower ash discharge pressure can be selected to share the same sub-pipeline 2 with the first side 71 and the second side 72, thereby conserving pipeline resources and reducing the complexity and cost of the pipeline layout within the thermal power plant.
[0034] In order to save pipeline resources and reduce the complexity and cost of pipeline layout in thermal power plants, refer to Figure 1 and Figure 2 , the sub-pipes 2 of at least two sub-areas 6 can be connected to the same main pipe 3. Specifically, for example, in some embodiments provided by the present disclosure, the sub-pipes 2 of two sub-areas 6 with smaller ash discharge volumes can be connected to the same main pipe 3. In addition, in some other embodiments, the sub-pipes 2 of three or four sub-areas 6 with smaller ash discharge volumes can also be connected to the same main pipe 3.
[0035] Reference Figure 1 and Figure 2 Each ash collection device 1 includes an ash hopper 11 and a silo pump 12. The ash hopper 11 can be used to collect coal ash. The silo pump 12 can be connected between the ash hopper 11 and the corresponding sub-pipeline 2 to pump the ash in the ash hopper 11 to the corresponding sub-pipeline 2. The specific working principles of the ash hopper 11 and the silo pump 12 are well known to those skilled in the art and will not be repeated here.
[0036] Reference Figure 1 and Figure 2A first valve 81 may be provided between the silo pump 12 and the ash hopper 11 to control the ash discharge volume of the ash hopper 11. A second valve 82 may be provided between the silo pump 12 and the sub-pipeline 2 to control the amount of coal ash outputted from the silo pump 12 to the sub-pipeline 2. Furthermore, an exhaust valve 85 may be provided on the silo pump 12. By opening the exhaust valve 85, the gas in the silo pump 12 is discharged. A vacuum is then created and the first valve 81 is opened to suck out the coal ash in the ash hopper 11. The gas source 4 may be connected to a location of the sub-pipeline 2 away from the corresponding main pipeline 3 via a first air pipe 91. That is, the gas source 4 supplies gas to the sub-pipeline 2 via the first air pipe 91 to blow out the coal ash in the sub-pipeline 2. The silo pump 12 may be connected to the gas source 4 to pass the gas in the gas source 4 into the silo pump 12, thereby blowing the coal ash in the silo pump 12 into the sub-pipeline 2. A third valve 83 may be provided on the first air pipe 91 to control the flow or interruption of the first air pipe 91.
[0037] Reference Figure 1 and Figure 2 The gas source 4 can be connected to the position of the sub-pipeline 2 near the corresponding main pipe 3 through the second gas pipe 92. That is, one end of the second gas pipe 92 can be connected to the gas source 4 to output the gas in the gas source 4, and the other end of the second gas pipe 92 can be connected to the sub-pipeline 2, and the connection position is close to the main pipe 3 corresponding to the sub-pipeline 2, so that the second gas pipe 92 can output the gas in the gas source 4 to the sub-pipeline 2 in the direction close to the main pipe 3. In this way, when the sub-pipeline 2 has a tendency to be blocked and it is difficult to meet the ash transportation demand, the sub-pipeline 2 is supplemented with gas to ensure the stable transportation of the coal ash, and at the same time, the transportation efficiency of the coal ash can be improved, ensuring that the coal ash is smoothly transported from the sub-pipeline 2 to the main pipe 3. A fourth valve 84 can be provided on the second air pipe 92. In this way, according to the air supply demand of the main pipeline 3, the opening of the fourth valve 84 can be controlled to adjust the air intake of the second air pipe 92 to supply the gas from the gas source 4 into the main pipeline 3 through the sub-pipeline 2. This can achieve precise control of the air supply, avoid overpressure or instability in each pipeline due to improper air supply, and improve the safety of the ash conveying system.
[0038] Further, refer to Figure 1 and Figure 2 Each silo pump 12 can be provided with a pressure sensor (not shown in the figure) that can be connected to the fourth valve 84. The pressure sensor can be used to monitor and detect the pressure changes in the silo pump 12 in real time, and then adjust the valve 81 according to the working status of the silo pump 12 to ensure that the silo pump 12 maintains normal operation within a safe range.
[0039] Reference Figure 1 and Figure 2The ash conveying system provided by the present disclosure also includes an electrostatic device (not shown in the figure) arranged on the ash hopper 11, which is used to prevent dust from gathering and accumulating in the ash hopper 11, so as to effectively avoid dust from gathering in the ash hopper 11, thereby helping to maintain the cleanliness and smoothness of the ash hopper 11, thereby improving the ash conveying efficiency of the ash collecting device 1 and extending the service life of the ash hopper 11.
[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.
[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0042] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A pneumatic ash conveying system for a thermal power plant, the thermal power plant comprising an ash silo and a plurality of sub-areas, characterized in that: The pneumatic ash conveying system of the thermal power plant comprises: A plurality of ash collecting devices, at least one ash collecting device is arranged in each of the sub-areas; A plurality of sub-pipes, wherein the ash collecting devices in each of the sub-areas are connected in series via corresponding sub-pipes, so that the sub-pipes receive ash in the corresponding ash collecting devices; Multiple mother pipes, one end of which is connected to the ash storage and the other end is connected to the corresponding sub-pipes; and The air source is used to discharge the ash in the ash collecting device to the ash storage via the corresponding sub-pipeline and the corresponding main pipe, Wherein, at least two of the mother pipes are connected to only one of the child pipes.
2. A pneumatic ash conveying system for a thermal power plant according to claim 1, characterized in that: At least three of the mother pipes are connected to only one of the child pipes.
3. A pneumatic ash conveying system for a thermal power plant according to claim 1 or 2, characterized in that: The thermal power plant also includes an economizer, and at least one ash collecting device is respectively arranged on the first side and the second side of the economizer. The ash collecting devices on the first side and the second side are respectively connected in series through corresponding sub-pipelines so that the sub-pipelines receive ash in the corresponding ash collecting devices.
4. A pneumatic ash conveying system for a thermal power plant according to claim 3, characterized in that: The sub-pipes of the first side, the second side, and at least one of the sub-areas are connected to the same main pipe.
5. A pneumatic ash conveying system for a thermal power plant according to claim 1 or 2, characterized in that: The sub-pipelines of at least two of the sub-areas are connected to the same main pipe.
6. A pneumatic ash conveying system for a thermal power plant according to claim 1, characterized in that: Each of the ash collecting devices includes an ash hopper and a silo pump, and the silo pump is connected between the ash hopper and the corresponding sub-pipeline to discharge the ash in the ash hopper to the corresponding sub-pipeline.
7. A pneumatic ash conveying system for a thermal power plant according to claim 6, characterized in that: A first valve is provided between the silo pump and the ash hopper, a second valve is provided between the silo pump and the sub-pipeline, and the silo pump is provided with an exhaust valve. The gas source is connected to a position of the sub-pipeline away from the corresponding mother pipe through a first air pipe, the silo pump is connected to the gas source, and a third valve is provided on the first air pipe.
8. A pneumatic ash conveying system for a thermal power plant according to claim 7, characterized in that: The gas source is communicated with the position of the sub-pipeline close to the corresponding main pipe through a second gas pipe, and a fourth valve is arranged on the second gas pipe.
9. A pneumatic ash conveying system for a thermal power plant according to claim 8, characterized in that: Each of the silo pumps is provided with a pressure sensor connected to the fourth valve.
10. A pneumatic ash conveying system for a thermal power plant according to claim 6, characterized in that: It also includes an electrostatic device arranged on the ash hopper.