Stokehole storage device of CFB (circulating fluid bed)

Abstract

The utility model provides a CFB stokehole storage device. 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 and the temperature detector are arranged in the stokehole bin; wherein 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 furnace front bin 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. According to the utility model, multi-index automatic monitoring can be carried out on the stokehole bin in real time, and the stokehole bin can be protected in time through the protective gas under the condition that safety risks exist, so that the safety and reliability of stored articles are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler detection technical field more specifically, relate to a CFB furnace front storage device. BACKGROUND

[0002] As a kind of environmental protection boiler, CFB boiler is suitable for low calorific value cheap fuel, and it occupies a large proportion in domestic power generation and heating application.CFB boiler combustion features are: it can be suitable for multiple fuels, for example, commonly used combustion price is relatively low, and volatile brown coal.It is known that the characteristics of brown coal are relatively low calorific value and relatively high volatility, and it is particularly easy to oxidize and cause spontaneous combustion in air, so when storing it in front of boiler, if it is long-term stacked or improperly stored, it is easy to cause spontaneous combustion.

[0003] The existing CFB furnace front coal storage bin often causes safety accidents due to fuel spontaneous combustion, and even explosion in serious cases, causing loss of life and property.

[0004] Therefore, a CFB furnace front storage device is needed to ensure the safety and reliability of the furnace front bin when storing various fuels. SUMMARY

[0005] In view of the above problems, the utility model aims at providing a CFB furnace front storage device to solve the problem that the existing conveying mode cannot be applied to small space or short conveying distance, and the use of pipeline transportation will lead to complex device and high cost.

[0006] The CFB furnace front storage device provided by the utility model comprises a furnace front bin, a main control system, an oxygen detector arranged in the furnace front bin, a temperature detector, and a gas protection assembly.The oxygen detector is used to detect the real-time oxygen content signal in the furnace front bin and send it to the main control system.The temperature detector is used to detect the real-time temperature signal in the furnace front bin and send it to the main control system.The main control system is used to control the gas protection assembly to input protective gas into the furnace front bin according to the real-time oxygen content signal and the real-time temperature signal.

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

[0008] In addition, the optional technical solution is that the temperature detector is provided with at least one, 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 stored goods in the furnace front bin.

[0009] In addition, the optional technical scheme is that a horizontally extending support frame and a gas permeable protective cover are arranged on the inner side wall of the furnace front bin; the temperature detector is fixed on the support frame and accommodated in the gas permeable protective cover.

[0010] In addition, the optional technical scheme is that the gas protection assembly comprises a protective gas tank connected with the furnace front bin through a pipeline, and an electric valve arranged on the pipeline; the main control system is used for controlling the opening and closing of the electric valve.

[0011] In addition, the optional technical scheme is that at least one pipeline connection port is arranged on the outer side wall of the furnace front bin; the pipeline connection port is connected with the protective gas tank through the pipeline.

[0012] In addition, the optional technical scheme is that the pipeline connection ports are uniformly or symmetrically distributed with respect to the outer wall of the furnace front bin.

[0013] In addition, the optional technical scheme is that electric maintenance valves in communication with the main control system are arranged on both sides of the electric valve.

[0014] In addition, the optional technical scheme is that a safety valve and a drainage device are further arranged on the protective gas tank.

[0015] In addition, the optional technical scheme is that the protective gas comprises nitrogen, helium and argon.

[0016] By using the above-mentioned CFB furnace front storage device, the oxygen content and temperature in the furnace front bin 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 limit, it indicates that the furnace front bin has natural risks, and then the control system can control the gas protection assembly to input the protective gas into the furnace front bin, the stored goods in the furnace front bin are protected by the protective gas, compared with the fire-fighting water, it is cleaner and will not cause adverse effects on the stored goods, and the safety and reliability of the furnace front bin can be guaranteed.

[0017] To the accomplishment of the foregoing and related ends, one or more aspects of the application, described in detail herein, include the features recited below. The foregoing Summary as well as the following Detailed Description and the embodiments described therin are intended to provide an overview of certain aspects of the application. Other aspects and advantages of the application will be apparent from the description contained herein. As such, these aspects are intended to provide an overview of certain aspects of the application. As such, these aspects are intended to provide an overview of certain aspects of the application and are not intended to provide an exclusive or exhaustive disclosure of the full scope of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other objects and advantages of the application will become apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 The figure shows a structure of the CFB furnace front storage device according to the embodiment of the present application.

[0020] The reference signs include: incoming material conveying belt 1, furnace front warehouse 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 maintenance valve 12.

[0021] The same reference signs in all the figures indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0022] In the following description, for the purpose of providing a comprehensive understanding of one or more embodiments, a number of specific details are set forth. It is apparent, however, that the embodiments can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or server including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] In order to describe the CFB furnace front storage device in the present application in detail, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0026] Figure 1 The schematic structure of the CFB front storage device is shown.

[0027] As Figure 1 shown, the CFB front storage device comprises a front furnace bin 2, a main control system 5, an oxygen detector 3 arranged in the front furnace bin 2, a temperature detector 9, and a gas protection assembly; wherein the oxygen detector 3 and the temperature detector 9 are arranged inside the front furnace bin 2, for detecting real-time oxygen content signals and real-time temperature signals in the front furnace bin 2 and sending them to the main control system 5; the main control system 5 can judge the current environment in the front furnace bin 2 according to the received real-time oxygen content signals and real-time temperature signals, and when there is a natural risk, the gas protection assembly can be controlled to input protective gas into the front furnace bin 2, thereby effectively protecting the stored goods in the front furnace bin 2.

[0028] In a specific embodiment of the present application, the uppermost part of the front furnace bin 2 transports the stored goods through the incoming material conveying belt 1; the stored goods can also be usually stored in the lower part of the front furnace bin 2.

[0029] The oxygen detector 3 can adopt a sensor for detecting oxygen content or concentration, and at least one can be arranged, and the oxygen detector 3 is arranged in the upper cavity of the front furnace bin 2 as much as possible; since the lower part of the front furnace bin 2 usually stores goods, the oxygen detector 3 can be arranged in the upper part of the front furnace bin 2, and in general, the upper space of the front furnace bin 2 is not completely occupied, and the reliability of oxygen content detection is higher, in addition, the oxygen detector 3 can also be arranged at multiple positions inside the front furnace bin 2 according to the storage capacity, and in the processing of the main control system 5, the maximum value in 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 also be used as the judgment basis.

[0030] Similarly, the temperature monitoring device can adopt a sensor for detecting the current temperature in the front furnace bin 2, and at least one can be arranged, and is distributed in the middle and / or lower part of the front furnace bin 2 as much as possible; unlike the detection of oxygen content, the temperature in the front furnace bin 2 is usually related to the stored material, in order to ensure the accuracy of the detection result, the temperature detector 9 can be arranged inside the stored goods.

[0031] Specifically, a support frame extending horizontally into the inside and a gas-permeable protective cover arranged on the support frame can be arranged on the inner side wall of the front furnace bin 2, and the temperature detector 9 can be fixed on the extended support frame and accommodated in the gas-permeable protective cover, which not only enables the temperature detector 9 to detect the temperature inside the goods, improving the accuracy of detection, but also ensures that the stored goods will not damage the temperature detector 9 when entering and leaving the bin.

[0032] In the CFB furnace front storage device, the gas protection assembly further comprises a protective gas tank 6 connected with the furnace front bin 2 through a pipeline, and an electric valve 7 arranged on the pipeline, and the main control system 5 can control the electric valve 7 to be opened or closed by judging the current risk condition in the furnace front bin 2. Wherein, at least one pipeline connection port 10 can be arranged on the outer wall of the furnace front bin 2, the pipeline connection port 10 is in communication with the protective gas tank 6 through a pipeline, and the protective gas can be quickly input into the furnace front bin 2, so as to ensure the safe storage of the goods. Wherein, the pipeline connection port 10 can be uniformly or symmetrically distributed about the outer wall of the furnace front bin 2, and then the protective gas can be quickly and uniformly input into the furnace front bin 2 through multiple inlets.

[0033] In one specific embodiment of the present application, electric maintenance valves 12 in communication with the main control system 5 are further arranged on both sides of the electric valve 7, and when the electric valve 7 is abnormal or needs to be offline for maintenance, the electric maintenance 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 container, a safety valve 11 needs to be arranged on the protective gas tank 6 to ensure the safe operation of the whole CFB furnace front storage device.

[0034] The above-mentioned protective gas can be set according to the characteristics of the goods to be stored, for example, when the stored goods 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 real-time oxygen content signal and the real-time temperature signal can be directly sent to the main control system 5 for analysis and processing, or can be pre-converted by a corresponding signal converter (including signal converter 4 and signal converter 8). The real-time oxygen content signal and the real-time temperature signal are converted into electrical signals and continuously transmitted to the main control system 5, and the risk is predicted by the main control system 5.

[0036] In the application process of the CFB furnace front storage device, first, the real-time oxygen content signal in the target furnace front bin is detected by the oxygen detector and sent to the main control system; and the real-time temperature signal in the furnace front bin is detected by the temperature detector and sent to the main control system; then, whether the real-time oxygen content signal is lower than the first preset value and whether the real-time temperature signal is higher than the second preset value are judged; finally, 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 assembly to input the protective gas into the furnace front bin.

[0037] Wherein, the first preset value can be set to 12%, and the second preset value can be set to 45℃, and the type (ignition point and other parameters) of the stored goods and the storage requirement can be set by the main control system.

[0038] In one specific embodiment of the utility model, through the temperature detector installed at the lower part of the furnace front bin and the oxygen concentration detector installed at the air side of the upper part of the coal bin, the temperature of the stored goods inside the furnace front bin and the oxygen concentration in the air are detected at all times, once the oxygen content is below 12% and the fuel temperature inside the bin is higher than 45 DEG C, the oxygen content abnormal signal and the temperature abnormal signal can be transmitted to the main control system through the signal converter, the main control system issues a control signal to start the electric valve, so that the protective gas in the protective gas tank enters the furnace front bin through the pipeline, rapidly replaces the oxygen, thereby destroying the spontaneous combustion condition inside the furnace front bin, and protecting the safety of the furnace front bin and the stable operation of the CFB boiler.

[0039] It can be known that the wet fire-fighting pipeline is mainly adopted for preventing spontaneous combustion of the furnace front bin at present, once an accident occurs, the fire-fighting water will cause pollution of the production area, and the fuel will also increase the moisture, which will cause the CFB boiler to suffocate fire, and the time and effort are consumed for restarting, the oxygen detector needs to be installed in the air part inside the furnace front bin and fully contact with the air in the implementation process of the utility model, and according to the size and shape of the furnace front bin, a plurality of oxygen detectors and temperature detectors can be uniformly distributed, and the temperature detector is installed on the inner wall of the furnace front bin and fully contacts with the stored goods, so that the accuracy of signal detection and monitoring is improved.

[0040] The main control system needs to set the limit value (preset value) of the temperature and the oxygen concentration in advance, in order to avoid misjudgment, the 3-to-1 mode can be adopted according to the temperature and the oxygen signal, that is, the detection signals are selected for judgment through a certain frequency, or the length of time of the abnormal signal is judged in a continuous time period, when the length of time exceeds the preset value, it is indicated that safety protection is needed. In addition, a safety valve and a drain device can be arranged on the protective gas tank for protecting the safety of the entire inert gas system.

[0041] According to the CFB furnace front storage device of the utility model, the oxygen content and the temperature inside the furnace front bin 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 limit, the control system controls the gas protection assembly to input the protective gas into the furnace front bin, the device structure is simple, the operation is convenient, the whole protection system can be completed through the PLC control, and the CFB boiler combustion has no negative influence, which is clean, safe and reliable.

[0042] The CFB furnace front storage device according to the utility model is described above with reference to the drawings in an exemplary manner. However, those skilled in the art should understand that various improvements can be made to the CFB furnace front storage device of the utility model described above without departing from the content of the utility model. Therefore, the protection scope of the utility model should be determined by the content of the appended claims.

Claims

1. A CFB furnace front storage device, characterized in that, The CFB furnace front storage device comprises a furnace front bin, a main control system, an oxygen detector, a temperature detector and a gas protection assembly arranged in the furnace front bin. The oxygen detector is arranged to detect the real-time oxygen content signal in the furnace front bin and send it to the main control system. The temperature detector is arranged to detect the real-time temperature signal in the furnace front bin and send it to the main control system. The main control system is arranged to control the gas protection assembly to input protective gas into the furnace front bin 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, wherein the oxygen detector is arranged at least one, and the oxygen detector is distributed in the upper cavity of the furnace front bin.

3. The CFB furnace front storage device according to claim 1, wherein the temperature detector is arranged at least one, 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 stored goods in the furnace front bin.

4. The CFB furnace front storage device according to claim 3, wherein a support frame and a gas permeable protective cover are arranged on the inner side wall of the furnace front bin; the temperature detector is fixed on the support frame and accommodated in the gas permeable protective cover.

5. The CFB furnace front storage device according to claim 1, wherein the gas protection assembly comprises a protective gas tank connected with the furnace front bin through a pipeline, and an electric valve arranged on the pipeline; the main control system is arranged to control the electric valve. At least one pipeline connection port is arranged on the outer side wall of the furnace front bin; the pipeline connection port is connected with the protective gas tank through the pipeline.

7. The CFB furnace front storage device according to claim 6, wherein the pipeline connection ports are uniformly 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, wherein an electric maintenance valve is arranged on both sides of the electric valve and connected with the main control system.

9. The CFB furnace front storage device according to claim 5, wherein a safety valve and a drainage device are further arranged on the protective gas tank.

10. The CFB furnace front storage device according to claim 1, wherein the protective gas comprises nitrogen, helium and argon. ​ ​ ​ 6. A CFB furnace front storage device according to claim 5, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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