CFB stokehole storage device and monitoring method thereof

Abstract

The invention provides a CFB stokehole storage device and a monitoring method thereof. The CFB stokehole storage device comprises a stokehole bin, a main control system, an oxygen detector, a temperature detector and a gas protection assembly, wherein the oxygen detector, the temperature detector and the gas protection assembly are arranged in the stokehole bin; wherein the upper end of the furnace front bin is used for conveying stored articles through a supplied material conveying belt; the oxygen detector is used for detecting a real-time oxygen content signal in the furnace front bin and sending the real-time oxygen content signal to the main control system; the temperature detector is used for detecting a real-time temperature signal in the stored article and sending the real-time temperature signal to the main control system; the main control system is used for controlling the gas protection assembly to input protection gas into the furnace front bin according to the real-time oxygen content signal and the real-time temperature signal. By means of the system and method, multi-index automatic monitoring can be conducted on the stokehole bin in real time, the stokehole bin is protected in time through the protective gas under the condition that safety risks exist, and safety and reliability of stored objects are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler detection, and more specifically, to a CFB furnace front storage device and a monitoring method thereof. Background Art

[0002] As an environmentally friendly boiler, CFB boilers occupy a large proportion in domestic power generation and heating applications because they are suitable for low calorific value and cheap fuels. The characteristics of CFB boiler combustion are: it can be suitable for a variety of fuels, for example, the common combustion price is relatively low and the volatility is high. It can be seen that the characteristics of lignite are relatively low calorific value and relatively high volatility. It is particularly easy to oxidize in the air and cause spontaneous combustion. When it is stored in front of the boiler, if it is stacked for a long time or stored improperly, it is very easy to cause spontaneous combustion.

[0003] The existing CFB furnace front coal storage bunker often causes safety accidents due to spontaneous combustion of fuel, and in severe cases, explosions may occur, resulting in loss of life and property.

[0004] Therefore, there is an urgent need for a CFB furnace front storage device that can ensure the safety and reliability of the furnace front bin when storing various types of fuels. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a CFB furnace storage device and a monitoring method thereof to solve the problems that the existing transportation method is not suitable for scenarios with small space or short transportation distance, and the use of pipeline transportation will lead to complex equipment and high cost.

[0006] The CFB furnace front storage device provided by the present invention comprises: a furnace front warehouse, a main control system, an oxygen detector and a temperature detector arranged in the furnace front warehouse, and a gas protection component; wherein the upper end of the furnace front warehouse conveys the stored items through an incoming material conveyor belt; the oxygen detector is used to detect the real-time oxygen content signal in the furnace front warehouse and send it to the main control system; the temperature detector is used to detect the real-time temperature signal in the stored items and send it to the main control system; the main control system is used to control the gas protection component to input protective gas into the furnace front warehouse according to the real-time oxygen content signal and the real-time temperature signal.

[0007] In addition, an optional technical solution is that the oxygen detector is provided at least at one location, and the oxygen detector is distributed in the upper cavity of the furnace front chamber.

[0008] In addition, an optional technical solution is that the temperature detector is provided at least at one place, and the temperature detector is distributed in the middle and / or lower part of the furnace front warehouse; and the temperature detector is located inside the items stored in the furnace front warehouse.

[0009] In addition, an optional technical solution is that a horizontally extending support frame and a breathable protective cover are provided on the inner wall of the furnace front chamber; the temperature detector is fixed on the support frame and accommodated in the breathable protective cover.

[0010] In addition, an optional technical solution is that the gas protection component includes a protection gas tank connected to the furnace front chamber through a pipeline, and an electric valve arranged on the pipeline; the main control system is used to control the switch of the electric valve.

[0011] In addition, an optional technical solution is to provide at least one pipe connection port on the outer side wall of the furnace front chamber; the pipe connection port is connected to the protective gas tank through the pipe.

[0012] In addition, an optional technical solution is that the pipeline connection ports are evenly or symmetrically distributed with respect to the outer wall of the furnace front chamber.

[0013] In addition, an optional technical solution is to provide electric inspection valves connected to the main control system on both sides of the electric valve.

[0014] In addition, an optional technical solution is that the protective gas includes nitrogen, helium and argon.

[0015] On the other hand, the present invention also provides a monitoring method for a CFB furnace front storage device, which is used to perform real-time monitoring of the above-mentioned CFB furnace front storage device, and the method includes: detecting a real-time oxygen content signal in the furnace front bin by an oxygen detector, and sending it to a main control system; at the same time, detecting a real-time temperature signal in the furnace front bin by a temperature detector, and sending it to the main control system; judging whether the real-time oxygen content signal is lower than a first preset value, and whether the real-time temperature signal is higher than a second preset value; when the real-time oxygen content signal is lower than the first preset value, and the real-time temperature signal is higher than the second preset value, controlling the gas protection component to input protective gas into the furnace front bin by the main control system.

[0016] By utilizing the above-mentioned CFB furnace front storage device and the monitoring method thereof, the oxygen content and temperature in the furnace front warehouse can be monitored in real time through the oxygen detector and the temperature detector. When the oxygen content and the temperature both reach the corresponding preset value limits, it indicates that there is a natural risk in the furnace front warehouse. Then, the control system can be used to control the gas protection component to input protective gas into the furnace front warehouse. The stored items in the furnace front warehouse are protected by the protective gas. Compared with fire-fighting water, it is cleaner and will not cause adverse effects on the stored items. The safety and reliability of the furnace front warehouse can be guaranteed.

[0017] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0019] Figure 1 Schematic diagram of the structure of a CFB furnace front storage device according to an embodiment of the present invention;

[0020] Figure 2 The figure is a flow chart of a method for monitoring a CFB furnace storage device according to an embodiment of the present invention.

[0021] The reference numerals therein include: incoming material conveyor belt 1, furnace front bin 2, oxygen detector 3, signal converter 4, main control system 5, protective gas tank 6, electric valve 7, signal converter 8, temperature detector 9, pipeline connection port 10, safety valve 11, electric inspection valve 12.

[0022] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0023] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0024] In the description of the present invention, it is to 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”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0026] In order to describe the CFB furnace storage device and the monitoring method thereof in detail, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Figure 1 The schematic structure of the CFB furnace front storage device according to an embodiment of the present invention is shown.

[0028] like Figure 1 As shown, the CFB furnace front storage device implemented by the present invention includes a furnace front warehouse 2, a main control system 5, an oxygen detector 3 and a temperature detector 9 arranged in the furnace front warehouse 2, and a gas protection component; wherein, the uppermost part of the furnace front warehouse 2 conveys the stored items through the incoming material conveyor belt 1; the oxygen detector 3 and the temperature detector 9 are both arranged inside the furnace front warehouse 2, and are used to detect the real-time oxygen content signal and the real-time temperature signal in the furnace front warehouse 2, and send them to the main control system 5; the main control system 5 can judge the current environment in the furnace front warehouse 2 according to the received real-time oxygen content signal and real-time temperature signal, and when there is a natural risk, the gas protection component can be controlled to input protective gas into the furnace front warehouse 2, so as to effectively protect the items stored in the furnace front warehouse 2.

[0029] Among them, the oxygen detector 3 can adopt a sensor for detecting oxygen content or concentration, which can be set at at least one place, and the oxygen detector 3 can be set in the upper cavity of the furnace front warehouse 2 as much as possible; because the lower part of the furnace front warehouse 2 usually stores stored items, the oxygen detector 3 can be set in the upper part of the furnace front warehouse 2. Under normal circumstances, the upper space of the furnace front warehouse 2 will not be fully occupied, and the reliability of oxygen content detection is higher. In addition, according to the storage capacity of the furnace front warehouse 2, oxygen detectors 3 can be set at multiple positions inside it. During the processing of the main control system 5, the maximum value of each real-time oxygen content signal can be used as the judgment basis, or the average value of each real-time oxygen content signal can be used as the judgment basis.

[0030] Similarly, the temperature monitoring device can use a sensor to detect the current temperature in the furnace front warehouse 2. It can also be set at least one place and distributed in the middle and / or lower part of the furnace front warehouse 2 as much as possible. Unlike the detection of oxygen content, the temperature in the furnace front warehouse 2 is usually related to the stored material. To ensure the accuracy of the test results, the temperature detector 9 can be set inside the items stored in the furnace front warehouse 2.

[0031] Specifically, a support frame extending horizontally inward and a breathable protective cover arranged on the support frame can be provided on the inner wall of the front-of-furnace warehouse 2. The temperature detector 9 can be fixed on the extended support frame and accommodated in the breathable protective cover. This structure can not only perform temperature detection deep inside the objects to improve the accuracy of the detection, but also ensure that the temperature detector 9 will not be damaged when the stored objects enter and leave the warehouse.

[0032] In the CFB furnace storage device of the present invention, the gas protection component further includes a protective gas tank 6 connected to the furnace warehouse 2 through a pipeline, and an electric valve 7 arranged on the pipeline. The main control system 5 can control the electric valve 7 to open or close by judging the current risk situation in the furnace warehouse 2. Among them, at least one pipeline connection port 10 can be set on the outer wall of the furnace warehouse 2. The pipeline connection port 10 is connected to the protective gas tank 6 through a pipeline, and the protective gas can be quickly input into the furnace warehouse 2 to ensure the safe storage of items. Among them, the pipeline connection port 10 can be evenly or symmetrically distributed about the outer wall of the furnace warehouse 2, and then the protective gas can be quickly and evenly input into the furnace warehouse 2 through multiple inlets.

[0033] In a specific embodiment of the present invention, electric inspection valves 12 are provided on both sides of the electric valve 7 and are connected to the main control system 5. When the electric valve 7 is abnormal or needs to be repaired offline, the electric inspection valve 12 can be manually closed or opened to ensure the reliability of the device under special circumstances. In addition, since the protective gas tank 6 is a pressure vessel, a safety valve 11 is also required to be provided on the protective gas tank 6 to ensure the safe operation of the entire CFB furnace storage device.

[0034] The protective gas can be set according to the characteristics of the items to be stored. For example, when the stored items are lignite with high volatility, the protective gas can be a rare gas such as nitrogen, helium or argon.

[0035] It should be noted that the above-mentioned real-time oxygen content signal and real-time temperature signal can be directly sent to the main control system 5 for analysis and processing, or they can be converted in advance through corresponding signal converters (including signal converter 4 and signal converter 8). After the real-time oxygen content signal and real-time temperature signal are converted into electrical signals, they are continuously transmitted to the main control system 5, and risk prediction is performed through the main control system 5.

[0036] Corresponding to the above-mentioned CFB furnace front storage device, the present invention also provides a monitoring method for the CFB furnace front storage device.

[0037] Specifically, Figure 2 The schematic flow chart of the CFB furnace front storage device monitoring method according to an embodiment of the present invention is shown.

[0038] like Figure 2 As shown, the CFB furnace storage device monitoring method according to the embodiment of the present invention includes:

[0039] S100: Detect the real-time oxygen content signal in the target furnace front bin through the oxygen detector and send it to the main control system;

[0040] S200: Detecting the real-time temperature signal in the furnace front chamber through a temperature detector and sending it to the main control system;

[0041] S300: Determine whether the real-time oxygen content signal is lower than a first preset value, and whether the real-time temperature signal is higher than a second preset value;

[0042] S400: When the real-time oxygen content signal is lower than the first preset value and the real-time temperature signal is higher than the second preset value, the main control system controls the gas protection component to input protective gas into the furnace front chamber.

[0043] The first preset value may be set to 12%, and the second preset value may be set to 45°C. The specific settings may be made through the main control system according to the type of stored items (different parameters such as ignition point) and storage requirements.

[0044] In a specific embodiment of the present invention, a temperature detector installed at the lower part of the furnace front bin and an oxygen concentration detector installed at the air side of the upper part of the coal bunker are used to detect the temperature of the items stored in the furnace front bin and the oxygen concentration in the air at all times. Once the oxygen content is lower than 12% and the fuel temperature in the bin is higher than 45°C, the abnormal oxygen content signal and the abnormal temperature signal can be transmitted to the main control system through the signal converter. The main control system sends a control signal to start the electric valve through logical judgment, so that the protective gas in the protective gas tank enters the furnace front bin through the pipeline, quickly replaces the oxygen, thereby destroying the spontaneous combustion conditions in the furnace front bin, protecting the safety of the furnace front bin and the stable operation of the CFB boiler.

[0045] It can be seen that the current prevention of spontaneous combustion in the furnace warehouse mainly adopts wet fire-fighting pipes. Once an accident occurs, the fire-fighting water will cause pollution to the production area, and the increase of moisture in the fuel will also suffocate the CFB boiler fire, and restarting is time-consuming and labor-intensive. The implementation process of the present invention requires that the oxygen detector be installed in the air part of the furnace warehouse to fully contact with the air. According to the size and shape of the furnace warehouse, multiple oxygen detectors and temperature detectors can be evenly distributed; and the temperature detector is installed on the inner wall of the furnace warehouse to fully contact with the stored items to improve the accuracy of signal detection and monitoring.

[0046] Among them, the main control system needs to set the temperature and oxygen concentration limits (preset values) in advance. In order to avoid misjudgment, the temperature and oxygen signals can be used in a 1-out-of-3 manner, that is, each detection signal is selected for judgment at a certain frequency, or the duration of the abnormal signal is judged within a continuous time period. When it exceeds the preset value, it indicates that safety protection is required. In addition, a safety valve and a drain device can be set on the protective gas tank to protect the safety of the entire inert gas system.

[0047] It should be noted that the embodiments of the above-mentioned CFB furnace front storage device monitoring method can refer to the description in the CFB furnace front storage device embodiment, and will not be repeated here.

[0048] According to the CFB furnace front storage device and the monitoring method thereof of the present invention, the oxygen content and temperature in the furnace front bin can be monitored in real time through the oxygen detector and the temperature detector, and when the oxygen content and the temperature reach the corresponding preset value limits, the gas protection component is controlled by the control system to input the protection gas into the furnace front bin. The device has a simple structure and is easy to operate. The entire protection system can be completed through PLC control, and has no negative impact on the combustion of the CFB boiler. It is clean, safe and reliable.

[0049] As described above, the CFB furnace storage device and the monitoring method thereof according to the present invention are described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the CFB furnace storage device and the monitoring method thereof proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A CFB furnace storage device, characterized in that: include: A furnace front chamber, a main control system, an oxygen detector, a temperature detector, and a gas protection component arranged in the furnace front chamber; wherein, The upper end of the furnace front warehouse conveys the stored items through the incoming material conveyor belt; The oxygen detector is used to detect the real-time oxygen content signal in the furnace front chamber and send it to the main control system; The temperature detector is used to detect the real-time temperature signal in the stored items and send it to the main control system; The main control system is used to control the gas protection component to input protective gas into the furnace front chamber according to the real-time oxygen content signal and the real-time temperature signal.

2. The CFB furnace front storage device according to claim 1, characterized in that: The oxygen detector is provided at least at one location, and the oxygen detector is distributed in the upper cavity of the furnace front bin.

3. The CFB furnace storage device according to claim 1, characterized in that: The temperature detector is provided at least at one place, and the temperature detector is distributed in the middle and / or lower part of the furnace front bin; and, The temperature detector is located inside the items stored in the furnace front bin.

4. The CFB furnace front storage device according to claim 3, characterized in that: A support frame and a breathable protective cover extending horizontally are provided on the inner side wall of the furnace front bin; The temperature detector is fixed on the support frame and accommodated in the breathable protective cover.

5. The CFB furnace storage device according to claim 1, characterized in that: The gas protection assembly includes a protection gas tank connected to the furnace front chamber through a pipeline, and an electric valve arranged on the pipeline; The main control system is used to control the switch of the electric valve.

6. The CFB furnace storage device according to claim 5, characterized in that: At least one pipe connection port is provided on the outer side wall of the furnace front bin; The pipeline connecting port is connected to the protective gas tank through the pipeline.

7. The CFB furnace storage device according to claim 6, characterized in that: The pipeline connection ports are evenly or symmetrically distributed with respect to the outer wall of the furnace front bin.

8. The CFB furnace front storage device according to claim 5, characterized in that: Electric inspection valves communicated with the main control system are respectively arranged on both sides of the electric valve.

9. The CFB furnace front storage device according to claim 1, characterized in that: The protective gas includes nitrogen, helium and argon.

10. A monitoring method for a CFB furnace storage device, characterized in that: For real-time monitoring of the CFB furnace storage device according to any one of claims 1 to 9, the method comprises: The real-time oxygen content signal in the furnace front bin is detected by an oxygen detector and sent to the main control system; at the same time, the real-time temperature signal in the furnace front bin is detected by a temperature detector and sent to the main control system; Determining whether the real-time oxygen content signal is lower than a first preset value, and whether the real-time temperature signal is higher than a second preset value; When the real-time oxygen content signal is lower than the first preset value and the real-time temperature signal is higher than the second preset value, the main control system controls the gas protection component to input protective gas into the furnace front chamber.

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