Reheater ash discharging system
The reheater ash discharge system addresses the inefficiencies and safety concerns of manual cleaning by implementing a pneumatic conveying system with ash hoppers and multi-stage pipelines, ensuring efficient and safe ash removal from the reheater.
Patent Information
- Application Number
- CN202323613458.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-28
AI Technical Summary
Manual cleaning of reheater ash in thermal power plants is labor-intensive, time-consuming, and poses safety risks to operators, while existing pneumatic systems are not widely implemented due to lighter ash accumulation and higher temperature, especially in smaller or less technologically advanced plants.
A reheater ash discharge system comprising an ash hopper, bin pump units, and multi-stage ash conveying pipelines, utilizing pneumatic conveying to efficiently transport ash to an ash bin, integrating with existing systems for comprehensive dust removal.
The system efficiently transports dust from the reheater to the ash bin, replacing manual labor-intensive methods, enhancing cleaning efficiency and safety, and integrating with existing systems for comprehensive dust removal.
Smart Images
Figure CN222211400U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of boiler soot blowing, and in particular to a reheater soot blowing system. Background Art
[0002] Thermal power generation is a method of generating electricity by using fuel to generate heat energy and then converting the heat energy into electrical energy. Thermal power generation is one of the most common and main methods of generating electricity today. Thermal power plants usually use fossil fuels such as coal, natural gas, and oil as fuel, generate high-temperature and high-pressure steam through combustion, and then use the steam to drive the turbine to rotate the generator, and finally convert mechanical energy into electrical energy. Among them, the combustion process of fuel in the boiler is one of the core of power generation.
[0003] In the steam boiler system, dust is generated when the boiler burns coal, natural gas, biomass and other fuels. If these dusts are not removed, it will affect the heat exchange efficiency, increase fuel consumption, and may cause equipment damage. Therefore, these dusts need to be discharged and cleaned in time to ensure the cleanliness and efficient operation of the system. The traditional way of cleaning is to use manual cleaning, which uses shovels, brushes, scrapers and other tools to clean the accumulated dust. However, manual cleaning is not only labor-intensive, low in cleaning efficiency, and time-consuming, but also workers need to face direct risks or potential threats such as high temperature, harmful gases and dust when entering the ash hopper to work. The labor intensity is high and it usually needs to be done when the boiler is shut down. Nowadays, more and more modern power plants have abandoned manual cleaning methods and switched to more efficient and safer automated cleaning methods. One of the most common automated cleaning methods is pneumatic conveying, which uses airflow to transport dust from the ash hopper to a predetermined storage or treatment location. Compared with traditional manual cleaning, pneumatic conveying has high cleaning efficiency, can transport dust over long distances, reduces manual intervention, and greatly improves safety.
[0004] According to analysis, the ash accumulation phenomenon of the boiler mainly occurs in the combustion chamber, water-cooled wall tubes, superheater, economizer and air preheater, but in actual use, the ash accumulation phenomenon also occurs in the reheater. The reheater is usually located at a higher position in the boiler. Compared with the superheater and economizer, the dust content in the flue gas it contacts is lower, and the higher temperature of the reheater is not conducive to the accumulation of dust. Therefore, the ash accumulation degree of the reheater is lighter than that of the combustion chamber and superheater.
[0005] At present, due to various considerations such as technology or funds, especially in some small-scale power plants or power plants with limited technical conditions, the pneumatic cleaning system is mainly used for the combustion chamber, water-cooled wall tubes, superheater, economizer and other components where the above-mentioned ash accumulation problem is more obvious, while the reheater with relatively light ash accumulation still uses the traditional manual cleaning method, which is time-consuming, labor-intensive and poses a threat to the safety of operators.
[0006] Therefore, the prior art has defects and needs to be improved and developed. Utility Model Content
[0007] The utility model aims to provide a reheater ash discharge system to solve the problems of time-consuming, labor-intensive and safety threats to operators in manual ash removal of the reheater in a boiler system.
[0008] The utility model provides a reheater ash discharge system, comprising: an ash hopper, a first bin pump unit, a second bin pump unit and an ash bin connected in sequence;
[0009] The ash hopper is arranged below the reheater, and the feed end of the ash hopper is communicated with the reheater to receive the dust in the reheater;
[0010] The first bin pump unit includes a material sealing pump and a fluidizing plate, the feed end of the material sealing pump is connected to the discharge end of the ash hopper, and the discharge port of the material sealing pump is connected to the fluidizing plate;
[0011] The second bin pump unit comprises a cyclone barrel and a bin pump, and a feed end of the cyclone barrel is connected to a feed end of the bin pump;
[0012] The feed inlet of the ash silo is connected to the discharge end of the silo pump;
[0013] It also includes an air source part, which includes a fan and an air pipeline. The fan is connected to the material sealing pump through the air pipeline and is used to transport dust to the fluidizing disk and the rear of its output end.
[0014] Furthermore, there are multiple ash hoppers, and all of the ash hoppers are connected through a primary ash conveying pipeline and merge into the material sealing pump.
[0015] Furthermore, the primary ash conveying pipeline includes a plurality of primary ash conveying branch pipes and a plurality of primary ash conveying converging pipes;
[0016] Among them, the discharge end of each ash hopper is connected to each of the first-level ash conveying shunt pipes, and every two ash hoppers are connected in parallel to one of the first-level ash conveying converging pipes through the first-level ash conveying shunt pipes to the material sealing pump.
[0017] Furthermore, there are multiple second bin pump units, and all of the second bin pump units are commonly connected to the first bin pump unit through a secondary ash conveying pipeline, and are commonly connected to the ash storage through a tertiary ash conveying pipeline.
[0018] Furthermore, the secondary ash conveying pipeline includes a secondary ash conveying confluence pipe and a plurality of secondary ash conveying diversion pipes;
[0019] Among them, the discharge end of the fluidizing plate is connected to the secondary ash conveying confluence pipe, and is correspondingly diverted to each of the second bin pump parts through the secondary ash conveying diversion pipe.
[0020] Furthermore, the three-stage ash conveying pipeline includes a plurality of three-stage ash conveying branch pipes and three-stage ash conveying converging pipes;
[0021] Among them, the discharge end of each of the cyclones is correspondingly connected to each of the three-stage ash conveying and diversion pipes, and is connected in parallel through the three-stage ash conveying and diversion pipes to merge into the ash bin.
[0022] Furthermore, it also includes a spare ash conveying part, which includes a plurality of spare ash conveying pipes and a gate valve correspondingly arranged on each of the spare ash conveying pipes;
[0023] Among them, each of the spare ash conveying pipes is connected to each of the first-level ash conveying branch pipes or the first-level ash conveying converging pipes.
[0024] Furthermore, a valve is provided at the discharge end of the material sealing pump and / or the discharge end of the silo pump.
[0025] Furthermore, a filter is provided in the gas transmission pipeline.
[0026] Furthermore, the blower is a Roots blower.
[0027] Beneficial effects:
[0028] It can be seen from the above technical solutions that the technical solution of the utility model provides a reheater ash discharge system. Through the reasonable design of the ash hopper, various silo pump parts and various levels of ash conveying pipelines, the dust in the reheater can be quickly and efficiently transported to the ash bin. Pneumatic conveying replaces the traditional time-consuming and labor-intensive manual cleaning method, greatly improving the cleaning efficiency.
[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 A schematic diagram of the structure of the reheater ash discharge system provided in an embodiment of the present application.
[0031] Figure 2 A schematic structural diagram of a reheater ash discharge system provided in another embodiment of the present application.
[0032] In the figure, the meanings of the reference numerals are as follows:
[0033] 1-ash hopper, 2-first bin pump unit, 201-material sealing pump, 202-fluidizing plate, 3-second bin pump unit, 301-cyclone, 302-bin pump, 4-ash storage, 5-air source unit, 501-fan, 502-gas pipeline, 503-filter, 6-spare ash conveying unit, 601-spare ash conveying pipe, 602-gate valve, 7-first-level ash conveying pipeline, 701-first-level ash conveying diversion pipe, 702-first-level ash conveying confluence pipe, 8-second-level ash conveying pipeline, 801-second-level ash conveying confluence pipe, 802-second-level ash conveying diversion pipe, 9-third-level ash conveying pipeline, 901-third-level ash conveying diversion pipe, 902-third-level ash conveying confluence pipe, 10-gate valve, 11-feed valve. DETAILED DESCRIPTION
[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0037] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0038] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.
[0039] In the steam boiler system, the dust generated by boiler combustion needs to be discharged and cleaned in time. The traditional method of cleaning is manual cleaning, which is labor-intensive, inefficient, and has potential risks such as high temperature, harmful gases and dust. Therefore, more and more power plants are using more efficient and safer automated cleaning methods, such as transporting dust to designated locations through pneumatic and hydraulic forces. According to analysis, boiler ash accumulation mainly occurs in the combustion chamber, water-cooled wall tubes, superheaters, economizers and air preheaters, and there is also ash accumulation in the reheater, but the degree is lighter than other parts. Therefore, in some power plants, the traditional manual cleaning method is still used for the dust in the reheater.
[0040] Based on the above situation, the embodiment of the present application provides a reheater ash discharge system, which transforms the ash discharge part of the reheater so that it can be directly applied to the original pneumatic ash conveying system. Figure 1 The reheater ash discharge system includes an ash hopper 1, a first bin pump unit 2, a second bin pump unit 3 and an ash storage 4 which are sequentially connected by pipelines.
[0041] Reference Figure 1 , wherein the ash hopper 1 is arranged below the reheater in the boiler system, and the feed end of the ash hopper 1 is connected to the reheater to receive the dust falling from the reheater.
[0042] The first bin pump unit 2 includes a material sealing pump 201 and a fluidizing plate 202 . The feed end of the material sealing pump 201 is connected to the discharge end of the ash hopper 1 , and the discharge port of the material sealing pump is connected to the fluidizing plate 202 .
[0043] The second bin pump unit 3 includes a cyclone barrel 301 and a bin pump 302 , and a feed end of the cyclone barrel 301 is connected to a feed end of the bin pump 302 .
[0044] The feed inlet of the ash bin 4 is connected to the discharge end of the bin pump 302 .
[0045] It also includes an air source unit 5, which includes a fan 501 and an air pipeline 502. The fan 501 is connected to the material sealing pump 201 through the air pipeline 502 to transport dust to the fluidizing disk 202 and the rear of its output end.
[0046] In this embodiment, the ash hopper 1 and the second bin pump part 3 can be multiple. In another embodiment, the ash hopper 1 and the second bin pump part 3 can also be one. Among them, the ash hopper 1 is connected to and merged into the material seal pump 201 in the first bin pump part 2 through the primary ash conveying pipeline 7, the feed end of the second bin pump part 3 is connected to the fluidizing plate 202 in the first bin pump part 2 through the secondary ash conveying pipeline 8, and the discharge end of the second bin pump part 3 is connected to the ash bin 4 through the tertiary ash conveying pipeline 9. The specific difference between the two embodiments can be referred to. Figure 1 and Figure 2 To further clarify, I will not elaborate on this here.
[0047] Reference Figure 1 The dust generated in the reheater falls into the ash hopper 1 below under its own gravity, and is sequentially transported to the material seal pump 201 and the fluidizing plate 202 through the primary ash conveying pipeline 7. At this time, the fan 501 delivers a stable airflow to the material seal pump 201 through the air delivery pipeline 502. Under the fluidization of the fluidizing plate 202, the dust is then transported to the cyclone 301 through the secondary ash conveying pipeline 8. Subsequently, in the cyclone 301, the dust is separated from the airflow under its centrifugal action and falls into the silo pump 302 below, and finally transported to the ash silo 4 through the tertiary ash conveying pipeline 9 for subsequent processing.
[0048] In this embodiment, the reheater ash discharge system can be used as an independent system or in combination with the existing pneumatic conveying system in the boiler system. When used in combination, the three-stage ash conveying pipeline 9 mentioned above can be connected to the pipeline of the existing pneumatic conveying system, that is, the dust at the reheater is transported to the ash bin 4 together with the dust of the combustion chamber, water-cooled wall tubes, superheater, economizer, air preheater and other components in the boiler system.
[0049] When the ash hopper 1 and the second bin pump unit 3 are both provided in multiple configurations, the pipelines connected to the discharge end / feed end thereof are also adjusted accordingly to cope with the change in the ash delivery amount, thereby ensuring the stable operation of the system. Figure 1 The primary ash conveying pipeline 7 includes a plurality of primary ash conveying shunt pipes 701 and a plurality of primary ash conveying converging pipes 702; wherein, the discharge end of each ash hopper 1 is connected to each primary ash conveying shunt pipe 701, and each two ash hoppers 1 are connected in parallel to one primary ash conveying converging pipe 702 through the primary ash conveying shunt pipe 701 to the material sealing pump 201. Figure 1 The secondary ash conveying pipeline 8 includes a secondary ash conveying confluence pipe 801 and a plurality of secondary ash conveying branch pipes 802; wherein the discharge end of the fluidizing plate 202 is connected to the secondary ash conveying confluence pipe 801, and is correspondingly branched to each of the second bin pump parts 3 through the secondary ash conveying branch pipes 802. Figure 1 The three-level ash conveying pipeline 9 includes a plurality of three-level ash conveying shunt pipes 901 and a three-level ash conveying converging pipe 902; wherein, the discharge end of each of the cyclones 301 is correspondingly connected to each of the three-level ash conveying shunt pipes 901, and is connected in parallel through the three-level ash conveying shunt pipes 901 to merge into the ash bin 4.
[0050] In order to better control the dust flow during the conveying process, the discharge end of the material seal pump 201 and / or the discharge end of the silo pump 302 are provided with valves. Different pipes also use valves with different functions corresponding to the functional differences of the connected components. Specifically, a gate valve 10 can be provided on the secondary ash conveying confluence pipe 801 and / or the secondary ash conveying diversion pipe 802 to open or close the fluid channel on the discharge end side of the second silo pump part 3; and a feed valve 11 or a butterfly valve can be provided on the tertiary ash conveying diversion pipe 901 and / or the tertiary ash conveying confluence pipe 902. The feed valve 11 can more accurately control the on-off of the conveying channel and the size of the dust flow, while the butterfly valve has a similar function and is more suitable for rapid switching and flow regulation.
[0051] Reference Figure 1In this embodiment, the reheater ash discharge system further includes a spare ash conveying part 6 disposed on one side of the discharge end of the ash hopper 1, and the spare ash conveying part 6 includes a plurality of spare ash conveying pipes 601 and a gate valve 602 correspondingly disposed on each of the spare ash conveying pipes 601; wherein each of the spare ash conveying pipes 601 is correspondingly connected to each of the first-level ash conveying branch pipes 701 or the first-level ash conveying converging pipe 702. When the reheater ash discharge system operates normally, the gate valve 602 is in a closed state, and when the system fails or is undergoing routine maintenance, the gate valve 602 can be opened to divert the dust in the ash hopper 1 to be discharged from the spare ash conveying pipe 601 for processing.
[0052] Reference Figure 1 and Figure 2 In this embodiment, the fan 501 may be a Roots blower, which provides a more stable airflow for the system at relatively lower energy consumption and lower noise. Of course, a centrifugal blower or a turbine blower may also be used when a larger flow rate or higher pressure is required. In addition, to prevent dust or other impurities from entering the fan 501, a filter 503 is also provided in the air delivery pipeline 502 to prevent wear or blockage of key components such as the impeller of the fan 501, thereby causing the fan 501 to malfunction and affect the normal operation of the system.
[0053] In summary, the technical solution in the above embodiment provides a reheater ash discharge system, which, through the reasonable design of the ash hopper 1, each bin pump unit and each level of ash conveying pipeline, enables the dust in the reheater to be quickly and efficiently transported to the ash bin 4, and utilizes pneumatic conveying to replace the traditional time-consuming and labor-intensive manual cleaning method, thereby greatly improving the cleaning efficiency.
[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0055] The above is a detailed introduction to a reheater ash discharge system provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.
Claims
1. A reheater ash discharge system, characterized in that: include: An ash hopper, a first bin pump unit, a second bin pump unit and an ash silo are connected in sequence; The ash hopper is arranged below the reheater, and the feed end of the ash hopper is communicated with the reheater to receive the dust in the reheater; The first bin pump unit includes a material sealing pump and a fluidizing plate, the feed end of the material sealing pump is connected to the discharge end of the ash hopper, and the discharge port of the material sealing pump is connected to the fluidizing plate; The second bin pump unit comprises a cyclone barrel and a bin pump, and a feed end of the cyclone barrel is connected to a feed end of the bin pump; The feed inlet of the ash silo is connected to the discharge end of the silo pump; It also includes an air source part, which includes a fan and an air pipeline. The fan is connected to the material sealing pump through the air pipeline and is used to transport dust to the fluidizing disk and the rear of its output end.
2. The reheater ash discharge system according to claim 1, characterized in that: There are multiple ash hoppers, and all of the ash hoppers are connected through a primary ash conveying pipeline and merge into the material sealing pump.
3. The reheater ash discharge system according to claim 2, characterized in that: The primary ash conveying pipeline includes a plurality of primary ash conveying branch pipes and a plurality of primary ash conveying converging pipes; Among them, the discharge end of each ash hopper is connected to each of the first-level ash conveying shunt pipes, and every two ash hoppers are connected in parallel to one of the first-level ash conveying converging pipes through the first-level ash conveying shunt pipes to the material sealing pump.
4. The reheater ash discharge system according to claim 1, characterized in that: There are multiple second bin pump parts, and all of the second bin pump parts are connected to the first bin pump part through a secondary ash conveying pipeline, and are connected to the ash storage through a tertiary ash conveying pipeline.
5. The reheater ash discharge system according to claim 4, characterized in that: The secondary ash conveying pipeline includes a secondary ash conveying confluence pipe and a plurality of secondary ash conveying diversion pipes; Among them, the discharge end of the fluidizing plate is connected to the secondary ash conveying confluence pipe, and is correspondingly diverted to each of the second bin pump parts through the secondary ash conveying diversion pipe.
6. The reheater ash discharge system according to claim 4, characterized in that: The three-level ash conveying pipeline includes a plurality of three-level ash conveying branch pipes and a three-level ash conveying converging pipe; Among them, the discharge end of each of the cyclones is correspondingly connected to each of the three-stage ash conveying and diversion pipes, and is connected in parallel through the three-stage ash conveying and diversion pipes to merge into the ash bin.
7. The reheater ash discharge system according to claim 3, characterized in that: It also includes a spare ash conveying part, which includes a plurality of spare ash conveying pipes and a gate valve correspondingly arranged on each of the spare ash conveying pipes; Wherein, each of the spare ash conveying pipes is connected to each of the first-level ash conveying branch pipes or the first-level ash conveying confluence pipes.
8. The reheater ash discharge system according to claim 1, characterized in that: The discharge end of the material sealing pump and / or the discharge end of the silo pump is provided with a valve.
9. The reheater ash discharge system according to claim 1, characterized in that: A filter screen is arranged in the gas transmission pipeline.
10. The reheater ash discharge system according to claim 1, characterized in that: The blower is a Roots blower.