Intelligent ash conveying device for desulfurization of power generation boiler
Patent Information
- Application Number
- CN202522387955.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-11-11
AI Technical Summary
[0005]本实用新型的目的在于提供一种发电锅炉脱硫智能输灰装置，具备按需启停、智能调控与安全联锁功能，解决了现有技术中因周期性输灰模式导致的输灰效率低下、氮气资源浪费严重、设备磨损加剧的问题
[0012]与现有技术相比，本实用新型的优点和积极效果在于，
Smart Images
Figure CN224753714U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of desulfurization system for power generation boilers, and specifically relates to an intelligent ash conveying device for desulfurization of power generation boilers. Background Technology
[0002] A boiler is a mechanical device that uses the heat energy from the combustion of fuel or other heat energy to heat feedwater to produce steam or hot water with specified parameters and quality. Boilers used for power generation are called power generation boilers or power plant boilers. In a power generation boiler, the heat energy released from the combustion of fossil fuels is transferred to the water through the metal walls of the heating surface, heating the water into steam with a certain pressure and temperature. The steam then drives a steam turbine, converting the heat energy into mechanical energy. The steam turbine drives a generator, converting the mechanical energy into electrical energy to supply users. During the flue gas desulfurization process in a power generation boiler, desulfurization byproducts are generated, which need to be transported to an ash silo via an ash conveying system for storage and further processing.
[0003] Currently, the traditional periodic ash conveying mode is widely used, with the ash conveying system starting and stopping at fixed time intervals. When the amount of ash generated is small, the system idles or conveys a low-concentration ash-gas mixture, resulting in energy waste. The ash conveying process uses nitrogen as the conveying medium, and the periodic ash conveying, which operates under no-load or low-load conditions when the amount of ash is insufficient, causes a large waste of nitrogen. Frequent and unnecessary ash conveying operations exacerbate the wear and tear on components such as ash conveying pipes, valves, and pumps, shortening the service life of the equipment and increasing equipment maintenance and replacement costs.
[0004] There is an urgent need to develop a device that can make intelligent judgments based on actual working conditions and transport ash on demand, so as to improve ash transport efficiency, reduce operating costs, reduce equipment wear and tear and achieve energy conservation and emission reduction. Therefore, an intelligent ash transport device for desulfurization of power generation boilers is proposed. Summary of the Invention
[0005] The purpose of this utility model is to provide an intelligent ash conveying device for desulfurization of power generation boilers, which has the functions of on-demand start-up and shutdown, intelligent regulation and safety interlocking, and solves the problems of low ash conveying efficiency, serious waste of nitrogen resources and accelerated equipment wear caused by the periodic ash conveying mode in the prior art.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an intelligent ash conveying device for desulfurization of a power generation boiler, including a desulfurization system, an ash hopper, an ash conveying pipeline, and an ash bin. The outlet of the desulfurization system is equipped with a feed sensor, the side wall of the ash hopper is equipped with a temperature sensor, the ash conveying pipeline is equipped with a pressure sensor, and the ash bin is equipped with a level sensor. The signal output terminals of the feed sensor, temperature sensor, pressure sensor, and level sensor are electrically connected to a data processing unit, the output terminal of the data processing unit is connected to a control system, and the control output terminal of the control system is connected to a nitrogen supply system. The nitrogen supply system is connected to the ash conveying pipeline through a supply pipeline.
[0007] Preferably, the data processing unit has a built-in preset logic judgment module.
[0008] Preferably, at least two pressure sensors are provided at intervals along the conveying direction on the ash conveying pipe, namely a first pressure sensor near the ash hopper and a second pressure sensor near the ash bin.
[0009] Preferably, the nitrogen supply system includes a nitrogen source and a pressure tank, with a regulating valve installed on the pipeline between the nitrogen source and the pressure tank, and the outlet of the pressure tank connected to the ash conveying pipeline via a supply pipeline.
[0010] Preferably, a pneumatic slide gate valve and a feeder are provided at the bottom outlet of the ash hopper, and both the pneumatic slide gate valve and the feeder are electrically connected to the control system.
[0011] Preferably, it also includes a human-machine interface that is communicatively connected to the data processing unit and the control system.
[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. This utility model integrates sensors for feeding, temperature, pressure, and material level, and through intelligent analysis by the data processing unit, it achieves precise control and coordinated linkage of the entire ash conveying process, improves ash conveying efficiency, prevents pipeline blockage, and reduces manual operation intensity and cost. 2. This utility model has the functions of on-demand start / stop, intelligent control and safety interlock, which solves the problems of low ash conveying efficiency, serious waste of nitrogen resources and accelerated equipment wear caused by the periodic ash conveying mode in the prior art. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of an intelligent ash conveying device for desulfurization of a power generation boiler according to one embodiment. In the diagram above, 1 is the desulfurization system, 2 is the ash hopper, 3 is the ash conveying pipeline, 4 is the ash bin, 5 is the feed sensor, 6 is the temperature sensor, 7 is the pressure sensor, 8 is the material level sensor, 9 is the data processing unit, 10 is the control system, 11 is the nitrogen supply system, 12 is the supply pipeline, 13 is the logic judgment module, 14 is the pneumatic slide gate valve, 15 is the feeder, and 16 is the human-machine interface. Detailed Implementation
[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.
[0017] Example 1, as Figure 1 As shown, an intelligent ash conveying device for desulfurization of a power generation boiler includes a desulfurization system 1, an ash hopper 2, an ash conveying pipeline 3, and an ash bin 4. The desulfurization system 1 generates desulfurization byproducts during the flue gas desulfurization process. The ash hopper 2 temporarily stores desulfurized ash, serving as a buffer container to ensure continuous ash conveying. The ash bin 4 collects and stores the conveyed ash, acting as a terminal storage device. The ash conveying pipeline 3 connects the ash hopper 2 and the ash bin 4, serving as the channel for ash conveying. A feed sensor 5 is installed at the outlet of the desulfurization system 1 to monitor the ash discharge flow rate in real time. A temperature sensor 6 is installed on the side wall of the ash hopper 2 to monitor the internal temperature. A pressure sensor 7 is installed on the ash conveying pipeline 3 to monitor the internal pressure. A level sensor 8 is installed inside the ash bin 4 to monitor the ash level.
[0018] The signal output terminals of the feed sensor 5, temperature sensor 6, pressure sensor 7, and level sensor 8 are electrically connected to a data processing unit 9. The data processing unit 9 receives and processes the sensor signals and executes preset logic. The output terminal of the data processing unit 9 is connected to a control system 10. The control system 10 receives instructions from the data processing unit 9, controls the actuators, and coordinates the orderly and interlocked actions of each device. The control output terminal of the control system 10 is connected to a nitrogen supply system 11, which provides nitrogen as the conveying medium. The nitrogen supply system 11 is connected to the ash conveying pipeline 3 via a supply pipeline 12. The supply pipeline 12 delivers nitrogen to the ash conveying pipeline 3, serving as a power transmission channel.
[0019] The specific design of the aforementioned key components will be discussed in detail below: The data processing unit 9 has a built-in preset logic judgment module 13. The data processing unit 9 uses a programmable logic controller (PLC) or an industrial computer (IPC). The built-in preset logic judgment module 13 encapsulates the decision-making algorithm and implements "on-demand start / stop" and "safety monitoring" through the following logic: The logic judgment module 13 continuously receives the flow signal from the feed sensor 5 and the level signal from the level sensor 8. When both conditions are met simultaneously, namely "the feed flow rate is higher than the set value A for X seconds" and "the level of the ash hopper 4 is lower than the set value B", the module sends a "start ash conveying" command to the control system 10.
[0020] The logic judgment module 13 compares the reading of the temperature sensor 6 with the safety threshold D. Once the temperature exceeds the limit, the module will execute the safety interlock with the highest priority, immediately stop operation, and issue a high temperature alarm.
[0021] At least two pressure sensors 7 are spaced apart along the conveying direction on the ash conveying pipe 3, namely a first pressure sensor 7 near the ash hopper 2 and a second pressure sensor 7 near the ash bin 4. The first pressure sensor 7 is installed at the beginning of the ash conveying pipe 3 to detect the pressure at the starting point of the conveying process. The second pressure sensor 7 is installed at the end of the ash conveying pipe 3 to detect the pressure at the end point of the conveying process. Under stable conveying conditions, there is a reasonable pressure difference range between the two points. A significant increase in the pressure difference usually indicates that there is a blockage or ash accumulation in the middle section of the pipe; while an abnormal decrease in the pressure difference may indicate a feeding interruption or pipe leakage. The logic judgment module 13 calculates the pressure difference value ΔP between the first pressure sensor 7 and the second pressure sensor 7 in real time. When ΔP continuously exceeds the set threshold C, it is determined that the resistance of the ash conveying pipe 3 has increased abnormally, indicating a risk of blockage. A two-stage response is immediately triggered. First, a command is sent to the nitrogen supply system 11 to instantly increase the nitrogen pressure for purging. If the pressure difference still does not return to normal, an audible and visual alarm is issued and a shutdown procedure is executed.
[0022] The nitrogen supply system 11 includes a nitrogen source and a pressure tank. A regulating valve is installed on the pipeline between the nitrogen source and the pressure tank. The outlet of the pressure tank is connected to the ash conveying pipeline 3 via a supply pipeline 12. The nitrogen source provides the gas supply, and the regulating valve is an electrically operated regulating valve. The control signal terminal of the regulating valve is connected to the control system 10. The control system 10 precisely controls the opening degree according to the instructions of the data processing unit 9. The pressure tank is a buffer container for pressure stabilization and energy storage. It is connected after the regulating valve to smooth airflow pulsations and quickly release the compressed nitrogen stored in the tank when a large instantaneous flow is required, providing a strong purging force. After initial pressure regulation by the regulating valve, the nitrogen enters the pressure tank for pressure stabilization and is finally injected into the ash conveying pipeline 3 through the supply pipeline 12 at a stable and controllable pressure and flow rate.
[0023] A pneumatic slide gate valve 14 and a feeder 15 are installed at the bottom outlet of the ash hopper 2. Both the pneumatic slide gate valve 14 and the feeder 15 are electrically connected to the control system 10. At the outlet of the ash hopper 2, the pneumatic slide gate valve 14 and the feeder 15 are installed in sequence and controlled by the control system 10. During the start-up phase, the control system 10 first drives the pneumatic slide gate valve 14 to open fully, allowing material to fall onto the feeder 15. Then, the feeder 15 is started and rises to the set speed. During the stop phase, the control system 10 first stops the feeder 15, and the residual ash in the feeder 15 is purged clean by nitrogen gas. Then, the pneumatic slide gate valve 14 is closed.
[0024] It also includes a human-machine interface 16 that is communicatively connected to the data processing unit 9 and the control system 10. The human-machine interface 16 is a touch screen operation panel that establishes bidirectional communication with the data processing unit 9 and the control system 10 via a communication bus.
[0025] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.
Claims
1. A smart ash conveying device for desulfurization of a power generation boiler, comprising a desulfurization system, an ash hopper, an ash conveying pipeline, and an ash bin, characterized in that, The desulfurization system is equipped with a feed sensor at its outlet, a temperature sensor on the side wall of the ash hopper, a pressure sensor on the ash conveying pipeline, and a level sensor inside the ash silo. The signal output terminals of the feed sensor, temperature sensor, pressure sensor, and level sensor are electrically connected to a data processing unit. The output terminal of the data processing unit is connected to a control system. The control output terminal of the control system is connected to a nitrogen supply system. The nitrogen supply system is connected to the ash conveying pipeline through a supply pipeline.
2. The intelligent ash conveying device for desulfurization of a power generation boiler according to claim 1, characterized in that, The data processing unit has a built-in preset logic judgment module.
3. The intelligent ash conveying device for desulfurization of a power generation boiler according to claim 1 or 2, characterized in that, At least two pressure sensors are spaced apart along the conveying direction on the ash conveying pipe, namely a first pressure sensor near the ash hopper and a second pressure sensor near the ash bin.
4. The intelligent ash conveying device for desulfurization of a power generation boiler according to claim 1, characterized in that, The nitrogen supply system includes a nitrogen source and a pressure tank. A regulating valve is installed on the pipeline between the nitrogen source and the pressure tank. The outlet of the pressure tank is connected to the ash conveying pipeline through a supply pipeline.
5. The intelligent ash conveying device for desulfurization of a power generation boiler according to claim 1, characterized in that, A pneumatic slide gate valve and a feeder are installed at the bottom outlet of the ash hopper. Both the pneumatic slide gate valve and the feeder are electrically connected to the control system.
6. The intelligent ash conveying device for desulfurization of a power generation boiler according to claim 1, characterized in that, It also includes a human-machine interface that is communicatively connected to the data processing unit and the control system.