Device and method for measuring material level of vertical pipe of circulating fluidized bed boiler

Abstract

The invention provides a circulating fluidized bed boiler vertical pipe material level measuring device and method.The circulating fluidized bed boiler vertical pipe material level measuring device comprises a measuring body and a plurality of measuring points, the measuring body is installed in the pipe wall of a boiler vertical pipe through a fixing piece, and the boiler vertical pipe is provided with a material channel; the material channel is used for conveying materials, the extending direction of the measuring body is consistent with the extending direction of the boiler vertical pipe, the measuring body is located on the side, close to the material channel, of the boiler vertical pipe, and the multiple measuring points are arranged in the extending direction of the measuring body at intervals. The measuring points are used for measuring the temperature of the measuring points, monitoring and recording temperature changes of the multiple measuring points, and judging the material level height of materials in the boiler vertical pipe according to temperature data information. The material level measuring device for the vertical pipe of the circulating fluidized bed boiler has the advantages of being high in measuring precision, accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal control measurement of circulating fluidized bed boilers, and specifically, to a measuring device and method for the material level of a riser in a circulating fluidized bed boiler. Background Art

[0002] In a circulating fluidized bed boiler, the boiler riser cooperates with the return feeder to play a role in material transportation, enabling the material to be continuously and stably transported from a low pressure to a high pressure in the furnace. It realizes the flow of ash in the form of a moving bed, where the ash exists in the riser in the form of a material column, and the height of the material column represents the material level. This material level not only provides power for the flow of materials in the return feeder but also prevents the loosening air in the return feeder from flowing back into the separator, thus ensuring the efficiency of the separator. The material level is closely related to the operating load of the boiler, and its stability directly affects the operating efficiency and safety of the boiler.

[0003] In the related art, for the material level in the riser, the differential pressure can be measured through a pressure tapping pipe to indirectly reflect the material level. However, this method has certain drawbacks. First, since the looseness and density of the materials in the riser are different under different loads, the same differential pressure may correspond to different material level heights, resulting in inaccurate measurement results. Second, the pressure tapping pipe is prone to blockage, which leads to inaccurate pressure measurement and further affects the judgment of the material level.

[0004] In addition, a small number of temperature measurement points are installed in the riser. However, due to their easy wear and insufficient indication, these temperature measurement points have limited guiding significance for operators. With the increasing requirement for the operating flexibility of the boiler, problems such as the shedding of internal castables and the termination of material return occur frequently. These accidents caused by uneven material return seriously affect the normal operation of the boiler. Summary of the Invention

[0005] The present invention is made based on the inventor's discovery and recognition of the following facts and problems:

[0006] Currently, the measurement of the material level generally measures the differential pressure through a pressure tapping pipe to indirectly reflect the material level. This method has drawbacks. One is that the looseness of the materials in the riser is different under different loads, and the density is also different. There is a height difference under the same differential pressure, and it is not completely accurate. The other is that the pressure tapping pipe is prone to blockage, resulting in inaccurate pressure measurement.

[0007] Therefore, the present invention provides a measuring device and method for the material level of a riser in a circulating fluidized bed boiler, so as to judge the inventory and the material level height of the materials in the riser by measuring the temperature distribution and trend change in the height direction inside the riser.

[0008] The measuring device for the material level of a riser in a circulating fluidized bed boiler according to an embodiment of the present invention includes:

[0009] A measuring body is installed inside the wall of a boiler riser. The boiler riser has a material passage for conveying materials. The extending direction of the measuring body is the same as that of the boiler riser, and the measuring body is located on one side of the boiler riser adjacent to the material passage.

[0010] A fixing member is placed inside the wall of the boiler riser and connected to the wall surface of the boiler riser. The fixing member is used to fix the measuring body to the wall of the boiler riser.

[0011] There are multiple measuring points. The multiple measuring points are arranged at intervals along the extending direction of the measuring body. The measuring points are used to monitor the temperature inside the material passage.

[0012] The material level measuring device for the boiler riser of the embodiment of the present invention can measure the temperature inside the material passage by using multiple measuring points, and judge the material level height of the materials inside the boiler riser according to the temperature change of the measuring points. In addition, the measuring body is installed inside the boiler riser, avoiding forming an obstacle on the wall surface of the boiler riser, so as to ensure the stable flow of materials and the measurement accuracy. Compared with the traditional pressure-taking pipe, it also avoids the blockage problem of the measuring device and improves the reliability of the measuring device.

[0013] Therefore, the material level measuring device for the boiler riser of the embodiment of the present invention has the advantages of high measuring accuracy, accuracy and reliability.

[0014] In some embodiments, the wall of the boiler riser includes a wear-resistant castable layer and a heat-insulating material layer. The heat-insulating material layer is arranged along the circumferential direction of the wear-resistant castable layer. The measuring body is placed in the wear-resistant castable layer, and the ratio of the length of the measuring body in the wear-resistant castable layer to the height of the boiler riser is greater than or equal to and less than or equal to and the measuring body is located in the middle and lower part of the boiler riser in the height direction of the boiler riser.

[0015] In some embodiments, the distance between the measuring body and the inner circumferential wall of the wear-resistant castable layer is less than the distance between the measuring body and the outer circumferential wall of the wear-resistant castable layer.

[0016] In some embodiments, the distance between two adjacent measuring points is 50 mm to 100 mm, and the measuring temperature range of the measuring points is 350 °C to 950 °C.

[0017] In some embodiments, the material level measuring device for the boiler riser of the embodiment of the present invention further includes a sleeve, and the sleeve is sleeved on the measuring body along the circumferential direction of the measuring body.

[0018] In some embodiments, the riser level measuring device of the circulating fluidized bed boiler according to the embodiments of the present invention further includes a heat conduction layer and a heat insulation layer. There is an insulating gap between the inner peripheral wall of the sleeve and the outer peripheral wall of the measuring body. Both the heat conduction layer and the heat insulation layer are arranged in the insulating gap, and the heat conduction layer is located on the side of the measuring body adjacent to the material channel.

[0019] The riser level measuring method of the circulating fluidized bed boiler according to the embodiments of the present invention is completed according to the riser level measuring device of the circulating fluidized bed boiler described in any one of the above embodiments, and includes the following steps:

[0020] S1. Determine the measuring position of the boiler riser level;

[0021] S2. Install the measuring device, monitor and record the temperature changes at multiple measuring points;

[0022] S3. Screen the temperature data information reflecting the temperature change trend among the measuring points;

[0023] S4. Judge the level height of the material in the boiler riser according to the screened temperature data information.

[0024] In some embodiments, the measuring device includes an optical fiber, and the measuring accuracy of the measuring device is 0.5 °C.

[0025] In some embodiments, in step S2, the multiple measuring points are numbered, and the height of the boiler riser corresponding to each measuring point is recorded.

[0026] In some embodiments, according to the temperature data information fed back by the measuring points with corresponding numbers, the corresponding relationship between the measuring points and the boiler riser height is determined, and the level height in the boiler riser is obtained. Description of the Drawings

[0027] Figure 1 is the installation schematic diagram of the boiler riser level measuring method according to the embodiments of the present invention.

[0028] Figure 2 is the cross-sectional schematic diagram of the measuring body in the boiler riser level measuring method according to the embodiments of the present invention.

[0029] Reference Signs:

[0030] 100, material,

[0031] 1, measuring body, 11, measuring point,

[0032] 2, riser, 21, wear-resistant castable layer, 22, heat preservation material layer,

[0033] 3, sleeve

[0034] 4. Heat conduction layer

[0035] 5. Heat insulation layer Specific implementation manners

[0036] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0037] The material level measuring device for the riser 2 of the circulating fluidized bed boiler according to the embodiment of the present invention will be described below with reference to the drawings

[0038] The material level measuring device for the riser 2 of the circulating fluidized bed boiler according to the embodiment of the present invention includes a measuring body 1, a fixing member (not shown in the figure), and a plurality of measuring points 11.

[0039] As Figure 1 and Figure 2 shown, the measuring body 1 is installed inside the pipe wall of the boiler riser 2. The boiler riser 2 has a material 100 passage for transporting the material 100. The extending direction of the measuring body 1 is the same as that of the boiler riser 2, and the measuring body 1 is located on the side of the boiler riser 2 adjacent to the material 100 passage. The fixing member is placed inside the pipe wall of the boiler riser and is connected to the wall surface of the boiler riser. The fixing member is used to fix the measuring body to the pipe wall of the boiler riser. The plurality of measuring points 11 are arranged at intervals along the extending direction of the measuring body 1, and the measuring points 11 are used to monitor the temperature inside the material 100 passage.

[0040] Specifically, as Figure 1 shown, the extending direction of the boiler riser 2 (i.e., the height direction of the boiler riser 2) is the same as the up-and-down direction. The material 100 placed inside the boiler riser 2 generally flows in the direction from top to bottom. Since the extending direction of the measuring body 1 is the same as that of the boiler riser 2, the plurality of measuring points 11 are arranged at intervals in sequence along the height direction of the boiler riser 2, so as to be able to accurately monitor the temperature inside the material 100 passage at different heights, and thus judge the stock quantity and the material level height of the material 100 inside the boiler riser 2 by analyzing the temperature distribution and the change trend. The measuring body 1 is located on the side of the boiler riser 2 adjacent to the material 100 passage, that is, to ensure that the measuring body 1 is as close as possible to the material 100 side, so as to make the measurement result more accurate.

[0041] The fixing member can be a pin, that is, the pin can be fixed on the pipe wall of the boiler riser 2. The measuring body 1 can be connected to the pin by welding to prevent the measuring body 1 from falling off the pipe wall of the boiler riser 2. In addition, the measuring body 1 and the fixing member can also be connected by other means, such as clamping, plugging, etc.

[0042] It can be understood that the measuring device can adopt equipment such as optical fibers that can be used to monitor the temperature in the boiler riser 2. Of course, it can be selected according to the process requirements, operation adjustment and temperature measurement accuracy requirements in the actual working conditions, or a combination of multiple temperature measuring devices can be adopted to ensure the measurement accuracy.

[0043] It should be noted that during the operation of the circulating fluidized bed, a small amount of flue gas is introduced into the boiler riser 2 to be mixed with the material 100. Among them, when the pure gas (i.e., flue gas) or pure solid (i.e., material 100) in the boiler riser 2 passes through the measurement point 11, since the temperatures of the pure gas and the pure solid are stable with each other, the temperatures measured by multiple measurement points 11 are generally the same, or there will be small fluctuations. Then, the temperature at the interface between the flue gas and the material 100 (i.e., the gas-solid mixing place) is unstable. Therefore, by marking the unstable points, it can be determined which temperature measurement the material level specifically corresponds to, so as to determine the height of the material level.

[0044] In other words, the material level measuring device for the boiler riser 2 of the circulating fluidized bed boiler in the embodiment of the present invention can measure the temperature in the material 100 passage by using multiple measurement points 11, and judge the height of the material level of the material 100 in the boiler riser 2 according to the temperature change of the measurement points 11. In addition, the measuring body 1 is installed inside the boiler riser 2, avoiding forming an obstacle on the wall surface of the boiler riser 2, so as to ensure the stable flow of the material 100 and ensure the measurement accuracy. Compared with the traditional pressure tapping pipe, it also avoids the blockage problem of the measuring device and improves the reliability of the measuring device.

[0045] Therefore, the material level measuring device for the boiler riser 2 of the circulating fluidized bed boiler in the embodiment of the present invention has the advantages of high measurement accuracy, accuracy and reliability.

[0046] In some embodiments, the pipe wall of the boiler riser 2 includes a wear-resistant castable layer 21 and a heat-insulating material layer 22. The heat-insulating material layer 22 is arranged along the circumferential direction of the wear-resistant castable layer 21. The measuring body 1 is placed in the wear-resistant castable layer 21, and the ratio of the height of the measuring body 1 in the wear-resistant castable layer 21 to the height of the boiler riser 2 is greater than or equal to and less than or equal to and the measuring body 1 is located in the middle and lower part of the boiler riser 2 in the height direction of the boiler riser 2.

[0047] Specifically, as Figure 1As shown, both the thermal insulation layer 22 and the wear-resistant castable layer 21 are annular. The thermal insulation layer 22 is located on the outer peripheral wall of the wear-resistant castable layer 21, and the wear-resistant castable layer 21 encloses the material 100 passage. It can be understood that the wear-resistant castable layer 21 has high wear resistance and high temperature resistance (such as high-aluminum materials, etc.), directly contacts the material 100 inside the riser pipe, and protects the pipe wall from being worn by the high-speed flowing material 100. The wear-resistant castable can withstand high temperatures and mechanical impacts, thus ensuring the long-term stable operation of the riser pipe. The thermal insulation layer 22 is located outside the wear-resistant castable layer 21, and its main function is to maintain the heat inside the riser pipe and reduce heat loss. Thermal insulation materials usually have good heat insulation performance (such as clay materials, aluminosilicate materials, etc.), which helps to improve the overall thermal efficiency of the boiler.

[0048] The length of the measuring body 1 inside the wear-resistant castable layer 21 has a certain proportional relationship with the length of the boiler riser pipe 2, which can ensure that the measuring body 1 can cover the key area where the material 100 flows in the boiler riser pipe 2, so as to accurately monitor the temperature change in the material 100 passage. If this ratio is too low, the measuring body 1 may not be able to cover the area where the material level change is most obvious, affecting the accuracy of the measurement result.

[0049] In some embodiments, the distance between the measuring body 1 and the inner peripheral wall of the wear-resistant castable layer 21 is less than the distance between the measuring body 1 and the outer peripheral wall of the wear-resistant castable layer 21.

[0050] It can be understood that, as Figure 1 shown, the distance between the measuring body 1 and the inner peripheral wall of the wear-resistant castable layer 21 is a, and the distance between the measuring body 1 and the outer peripheral wall of the wear-resistant castable layer 21 is b, then a < b. That is to say, the measuring body 1 is closer to the inner wall of the wear-resistant castable layer 21 so as to be able to more directly monitor the situation of the material level change of the material 100.

[0051] That is to say, the measuring body 1 being closer to the inner wall of the boiler riser pipe 2 can reduce the interference to the measurement caused by external environmental factors (such as thermal expansion, vibration, etc.). Since the measuring body 1 is closer to the material 100, it can respond to the change of the material level faster, improving the real-time performance of the measurement. The measuring body 1 is close to the core area where the material 100 flows, and can more accurately capture the actual height of the material level, reducing the error caused by the deviation of the measurement position.

[0052] Preferably, the distance a between the measuring body 1 and the inner peripheral wall of the wear-resistant castable layer 21 is 10 - 40 mm.

[0053] Optionally, the distance between two adjacent measuring points 11 is 50 mm - 200 mm, and the measuring temperature range of the measuring point 11 is 350 °C - 950 °C.

[0054] It is understandable that the minimum distance between two adjacent measurement points 11 is set to 100 mm to ensure that the distribution of the measurement points 11 is dense enough to capture the details of the material level change. If the distance between the measurement points 11 is too small, it may lead to overly discrete measurement results and unable to accurately reflect the continuous change of the material level. Setting the maximum distance to 200 mm is to avoid too large a distance between the measurement points 11, resulting in missed measurements or inability to accurately capture the rapid change of the material level. A relatively large distance between the measurement points 11 may cause the material level change between the two measurement points 11 to not be detected in time, affecting the stable operation of the boiler.

[0055] In some embodiments, the material level measuring device for the riser 2 of the circulating fluidized bed boiler according to the embodiment of the present invention further includes a sleeve 3, and the sleeve 3 is sleeved on the measuring body 1 along the circumferential direction of the measuring body 1. It is understandable that the setting of the sleeve 3 is to protect the measuring body 1 and prevent the material 100 from directly contacting the measuring device, thereby extending the service life of the measuring device.

[0056] That is to say, the sleeve 3 is sleeved on the circumference of the measuring body 1, and the sleeve 3 provides all-round protection for the measuring body 1. The presence of the sleeve 3 can prevent the wear of the measuring body 1 and damage caused by high temperature or corrosive environment.

[0057] Optionally, the sleeve 3 can be of a sheathed structure. It is understandable that the sheathed structure provides additional mechanical protection, enabling the measuring device to withstand higher mechanical stress and thermal stress, thereby improving its durability in harsh environments; reducing conduction and electrical interference, and contributing to maintaining the accuracy of the thermocouple signal. The sheathed sleeve 3 is usually designed to be easy to install and maintain, reducing the on-site workload. Of course, the sheathed structure can be adjusted according to different application environments. For example, by selecting stainless steel sheaths of different materials to adapt to different temperature and corrosive conditions.

[0058] In some embodiments, the material level measuring device for the riser 2 of the circulating fluidized bed boiler according to the embodiment of the present invention further includes a heat conducting layer 4 and a heat insulating layer 5. There is an insulating gap between the inner circumferential wall of the sleeve 3 and the outer circumferential wall of the measuring body 1, and both the heat conducting layer 4 and the heat insulating layer 5 are arranged in the insulating gap, and the heat conducting layer 4 is located on the side of the measuring body 1 adjacent to the material 100 passage.

[0059] Specifically, as Figure 2 shown, there is an insulating gap between the inner circumferential wall of the sleeve 3 and the inner circumferential wall of the measuring body 1, and the insulating gap allows the heat conducting layer 4 and the heat insulating layer 5 to be placed therein. The design of the insulating gap ensures that the heat conduction performance of the measuring body 1 is not affected by the direct contact of the sleeve 3, and at the same time further helps to protect the measuring body 1 from wear.

[0060] The heat-conducting layer 4 is located on the side of the measuring body 1 adjacent to the material 100 passage. Its main function is to quickly and accurately conduct the heat from the material 100 passage to the measuring body 1 so that the measuring body 1 can detect the temperature change of the material level. Optionally, the heat-conducting layer 4 is usually made of materials with high thermal conductivity, such as copper, aluminum, or special high-temperature-resistant metal alloys, which can effectively transfer heat.

[0061] The heat-insulating layer 5 is located on the other side of the heat-conducting layer 4 in the insulating gap. The presence of the heat-insulating layer 5 can reduce the heat dissipation through the sleeve 3 and keep the temperature of the measuring body 1 stable. The heat-insulating layer 5 is usually made of materials with good heat-insulating performance, such as glass fiber, asbestos, rock wool, or other high-temperature-resistant heat-insulating materials.

[0062] That is to say, the heat-conducting layer 4 can quickly conduct heat, enabling the temperature of the measuring body 1 to reflect the actual temperature of the material 100 passage, thereby improving the measurement accuracy. The heat-insulating layer 5 reduces the heat dissipation through the sleeve 3, protects the measuring body 1 from the influence of external environmental temperature fluctuations, and improves the stability of the measuring device. Through the protection of the heat-conducting layer 4 and the heat-insulating layer 5, there is a certain isolation between the measuring body 1 and the high-temperature material 100 and the external environment, reducing wear and thermal shock, and thus extending the service life of the measuring device. In addition, the materials and thicknesses of the heat-conducting layer 4 and the heat-insulating layer 5 can also be adjusted according to different working environments and requirements to meet different heat-insulating and heat-conducting needs.

[0063] The following describes the method for measuring the material level of the riser of a circulating fluidized bed boiler according to an embodiment of the present invention.

[0064] The method for measuring the material level of the riser of a circulating fluidized bed boiler according to an embodiment of the present invention is completed according to the material level measuring device of the riser of a circulating fluidized bed boiler in any one of the above embodiments, and includes the following steps:

[0065] S1. Determine the measuring position of the material level of the boiler riser 2. It can be understood that the operator will determine the optimal material level measuring position according to the structure of the boiler riser 2 and the specific design of the boiler. Preferably, the measuring position is in the vertical part of the boiler riser 2 to facilitate the installation and monitoring of the subsequent measuring device.

[0066] S2. Install the measuring device and monitor and record the temperature changes of multiple measuring points 11. That is to say, install the material level measuring device at the determined position, and the device includes multiple temperature measuring points 11. These measuring points 11 are distributed along the height direction of the riser to monitor and record the temperature change conditions at different heights.

[0067] S3. Screen the temperature data information reflecting the temperature change trend among the measurement points 11. It can be understood that a computer data acquisition and processing system can be used to screen out the data information reflecting the temperature change trend. That is to say, the measuring device can be connected to a computer through a data recording and transmission device, which can record the temperature data information detected by the measuring device, send the temperature data information to the computer by wire or wirelessly, and use the computer for data processing.

[0068] S4. Judge the material level height of the material 100 in the boiler riser 2 according to the screened temperature data information. It can be understood that in the boiler riser 2, there is a difference in temperature when it is immersed in the material 100 and when it is not immersed in the material 100. According to the change of the temperature difference at each measurement point 11, it can be judged whether the position of the measurement point 11 is immersed in the material 100. Through the corresponding relationship between the position of the measurement point 11 and the height, the material level height can be obtained.

[0069] That is to say, when not immersed in the material 100, the temperature measured by the measuring device is the air temperature, which is relatively low and stable; when immersed in the material 100, the temperature measured is the temperature of the material 100, which is relatively high and has small fluctuations; for the upper layer of the material 100, the measured temperature fluctuates frequently. The air temperature and the temperature of the material 100 are different, and the fluctuation ranges of the air temperature and the temperature of the material 100 are also different. According to the operating state, if the temperature and the temperature fluctuation range at each measurement point 11 are determined, then it can be determined that the material 100 has buried a certain measurement point 11, and the material level height can be determined by combining the height of the measurement point 11.

[0070] Optionally, the measuring device includes an optical fiber, and the measuring accuracy of the measuring device is 0.5 °C. It can be understood that according to the specific measurement requirements and environmental conditions of the boiler riser 2, one or more temperature measuring devices can be used in combination. Preferably, the measuring device uses an optical fiber. That is to say, different sensors are suitable for different measurement environments and temperature ranges, enabling the measuring device to adapt to various complex conditions in the boiler. Accurate temperature measurement helps to better control the combustion process and improve the operating efficiency and economic benefits of the boiler.

[0071] In some embodiments, in step S2, a plurality of measurement points 11 are numbered, and the height of the corresponding boiler riser 2 for each measurement point 11 is recorded. It can be understood that after installing the measuring device, a plurality of measurement points 11 in the boiler riser 2 are numbered to facilitate the identification and recording of the data of each measurement point 11. The numbering can be a simple number sequence or a numbering system containing more information (such as the position and type of the measurement point 11).

[0072] In some embodiments, according to the temperature data information feedback from the measurement point 11 on the corresponding number, the corresponding relationship between the measurement point 11 and the height of the boiler riser 2 is determined, and the material level height in the boiler riser 2 is obtained.

[0073] It can be understood that by analyzing the temperature data feedback from the numbered measurement points 11, the temperature change trend of each measurement point 11 can be determined. Combining the temperature data with the numbers and corresponding heights of the measurement points 11 can establish the corresponding relationship between the temperature of the measurement points 11 and the height of the boiler riser 2, which helps to identify the relationship between the temperature change and the material level height. By analyzing the filtered temperature data, the material level height can be inferred. For example, if the temperature of a certain measurement point 11 suddenly drops, this may indicate that the interface between the flue gas and the material 100 is near this measurement point 11; if the temperatures of multiple measurement points 11 show a similar trend, the position of the material level can be determined as the measurement points 11.

[0074] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by 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", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 should not be construed as a limitation of the present invention.

[0075] 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0076] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0078] In the present invention, the terms "an embodiment", "some embodiments", "exemplifications", "specific exemplifications", or "some exemplifications", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or exemplification are included in at least one embodiment or exemplification of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or exemplification. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or exemplifications in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or exemplifications described in this specification and the features of different embodiments or exemplifications.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A riser inventory measurement device for a circulating fluidized bed boiler, characterized in that Comprising: A measurement body, which is installed inside the wall of a boiler riser. The boiler riser has a material passage for conveying materials. The extending direction of the measurement body is consistent with that of the boiler riser, and the measurement body is located on the side of the boiler riser adjacent to the material passage; A fixing member, which is placed inside the wall of the boiler riser and connected to the wall surface of the boiler riser. The fixing member is used to fix the measurement body to the wall of the boiler riser; Measurement points, there are multiple of them. The multiple measurement points are arranged at intervals along the extending direction of the measurement body. The measurement points are used to monitor the temperature inside the material passage.

2. The riser inventory measurement device of the circulating fluidized bed boiler according to claim 1, characterized in that The pipe wall of the boiler riser includes a wear-resistant castable layer and a heat-insulating material layer. The heat-insulating material layer is arranged circumferentially along the wear-resistant castable layer. The measuring body is placed in the wear-resistant castable layer, and the ratio of the length of the measuring body in the wear-resistant castable layer to the height of the boiler riser is greater than or equal to and less than or equal to and the measuring body is located in the middle and lower part of the boiler riser in the height direction of the boiler riser.

3. The standpipe inventory measurement device for a circulating fluidized bed boiler according to claim 2, characterized in that, The distance between the measurement body and the inner peripheral wall of the wear-resistant castable layer is less than the distance between the measurement body and the outer peripheral wall of the wear-resistant castable layer.

4. The standpipe material level measuring device of the circulating fluidized bed boiler according to claim 1, characterized in that The distance between two adjacent measurement points is 50 mm to 100 mm, and the measurement temperature range of the measurement points is 350 °C to 950 °C.

5. The riser level measuring device for a circulating fluidized bed boiler according to claim 1, wherein It further includes a sleeve, which is sleeved on the measurement body along the circumferential direction of the measurement body.

6. The standpipe material level measuring device for a circulating fluidized bed boiler according to claim 5, wherein, It further includes a heat-conducting layer and a heat-insulating layer. There is an insulating gap between the inner peripheral wall of the sleeve and the outer peripheral wall of the measurement body. The heat-conducting layer and the heat-insulating layer are both arranged in the insulating gap, and the heat-conducting layer is located on the side of the measurement body adjacent to the material passage.

7. A method for measuring the material level in the riser of a circulating fluidized bed boiler, wherein the method for measuring the material level in the riser of the circulating fluidized bed boiler is completed according to the measuring device for the material level in the riser of the circulating fluidized bed boiler described in any one of the above claims 1-6, and is characterized in that, Including the following steps: S1. Determine the measurement position of the material level in the boiler riser; S2. Install a measurement device to monitor and record the temperature changes of multiple measurement points; S3. Screen the temperature data information reflecting the temperature change trend among the measurement points; S4. Judge the material level height of the materials inside the boiler riser according to the screened temperature data information.

8. The method for measuring the riser inventory level of a circulating fluidized bed boiler according to claim 7, characterized in that, The measurement device includes an optical fiber, and the measurement accuracy of the measurement device is 0.5 °C.

9. The method for measuring the riser inventory level of a circulating fluidized bed boiler according to claim 8, wherein In step S2, number the multiple measurement points and record the height of the corresponding boiler riser for each measurement point.

10. The method for measuring the riser inventory level of a circulating fluidized bed boiler according to claim 9, characterized in that, According to the temperature data information fed back by the measurement points with corresponding numbers, determine the corresponding relationship between the measurement points and the height of the boiler riser, and obtain the material level height inside the boiler riser.

Images