An on-line replacement device for bed temperature element of circulating fluidized bed boiler

Abstract

The embodiment of the application discloses a circulating fluidized bed boiler bed temperature element online replacement device, which can realize online replacement of the bed temperature element and guarantee safe and stable operation of the unit under the condition of guaranteeing personal safety of workers. The application comprises a circulating fluidized bed body, a prefabricated temperature sleeve, a compressed air sleeve, a measuring pipeline assembly, a purging pipeline assembly, a purging pipeline pressure gauge, a purging pipeline temperature gauge and a connecting assembly. The prefabricated temperature sleeve is connected with the circulating fluidized bed body, the prefabricated temperature sleeve is connected with the compressed air sleeve, the measuring pipeline assembly is installed on the prefabricated temperature sleeve, the purging pipeline assembly is installed on the compressed air sleeve, the purging pipeline pressure gauge and the purging pipeline temperature gauge are both installed on the compressed air sleeve, the prefabricated temperature sleeve is used for placing a wear-resistant thermocouple, and the connecting assembly is installed on one side of the prefabricated temperature sleeve.

Description

Technical Field

[0001] This application relates to the field of circulating fluidized bed technology, and in particular to an online replacement device for bed temperature elements in a circulating fluidized bed boiler. Background Technology

[0002] The bed temperature of a circulating fluidized bed (CFB) typically ranges from 820℃ to 970℃, while the average bed pressure is 10 kPa. Bed temperature sensors undergo carbonization at high temperatures and are highly susceptible to wear and breakage due to the larger particle size of the bed material. This results in the loss of temperature monitoring in that area of ​​the CFB furnace, compromising the long-term safe operation of the CFB unit. Furthermore, because the furnace is under positive pressure, current measurement methods involve inserting the bed temperature sensor into the furnace through a prefabricated temperature sleeve, with external flange connections to prevent flue gas leakage. However, this method fails to isolate the high-temperature flue gas from the furnace, and online replacement could lead to the leakage of high-temperature flue gas, potentially causing personal injury or death. Therefore, this application provides an online replacement device for CFB boiler bed temperature sensors to address these problems. Summary of the Invention

[0003] This application provides an online replacement device for bed temperature elements in a circulating fluidized bed boiler. While ensuring the personal safety of operators, it enables online replacement of bed temperature elements, thus ensuring the safe and stable operation of the unit.

[0004] This application provides an online replacement device for bed temperature elements in a circulating fluidized bed boiler, comprising: a circulating fluidized bed body, a prefabricated temperature sleeve, a compressed air sleeve, a measuring pipeline assembly, a purge pipeline assembly, a purge pipeline pressure gauge, a purge pipeline temperature gauge, and a connecting assembly;

[0005] The prefabricated temperature sleeve is connected to the circulating fluidized bed body and the compressed air sleeve. The measuring pipeline assembly is installed on the prefabricated temperature sleeve, and the purging pipeline assembly is installed on the compressed air sleeve. The purging pipeline pressure gauge and the purging pipeline temperature gauge are both installed on the compressed air sleeve. The prefabricated temperature sleeve is used to place the wear-resistant thermocouple, and the connecting assembly is installed on one side of the prefabricated temperature sleeve.

[0006] Optionally, the connection between the compressed air sleeve and the pre-formed temperature sleeve is integrally formed, and the compressed air sleeve and the pre-formed temperature sleeve are in communication.

[0007] Optionally, the measuring pipeline assembly includes a primary measuring pipeline gate and a secondary measuring pipeline gate, both of which are mounted on the prefabricated temperature sleeve, and a preset distance is provided between the primary measuring pipeline gate and the secondary measuring pipeline gate.

[0008] Optionally, the primary valve of the measuring pipeline is located on one side of the connection between the compressed air sleeve and the pre-made temperature sleeve.

[0009] Optionally, the purge pipeline assembly includes a primary purge pipeline valve and a secondary purge pipeline valve, both of which are mounted on the compressed air sleeve, and a preset distance is provided between the primary purge pipeline valve and the secondary purge pipeline valve.

[0010] Optionally, the purge line pressure gauge is positioned above the primary valve of the purge line, and the purge line temperature gauge is positioned above the purge line pressure gauge.

[0011] Optionally, the secondary valve of the purging pipeline is located on one side of the connection between the compressed air sleeve and the pre-heated sleeve.

[0012] Optionally, the connection assembly includes a connecting flange and a graphene gasket, one end of the prefabricated temperature sleeve is inserted into the circulating fluidized bed body, and the other end of the prefabricated temperature sleeve is detachably equipped with the connecting flange and the graphene gasket.

[0013] Optionally, the other end of the compressed air sleeve is connected to an external compressed air tank, and the connection between the compressed air sleeve and the external compressed air tank is sealed.

[0014] Optionally, the primary valve of the measuring pipeline, the secondary valve of the measuring pipeline, the primary valve of the purging pipeline, and the secondary valve of the purging pipeline are all high-temperature resistant valves.

[0015] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0016] This application's online replacement device for circulating fluidized bed boiler bed temperature elements includes a circulating fluidized bed body, a prefabricated temperature sleeve, a compressed air sleeve, a measuring pipeline assembly, a purge pipeline assembly, a purge pipeline pressure gauge, a purge pipeline temperature gauge, and a connecting assembly. The temperature and pressure inside the compressed air sleeve can be obtained through the purge pipeline pressure gauge and temperature gauge. When both temperature and pressure are normal, the wear-resistant thermocouple inside the prefabricated temperature sleeve is pulled out. At this time, the measuring pipeline assembly is in the open state. After the wear-resistant thermocouple is pulled out, the measuring pipeline assembly is closed. When it is necessary to insert a wear-resistant thermocouple, the measuring pipeline assembly is opened sequentially. After the wear-resistant thermocouple is fully inserted into the prefabricated temperature sleeve, it is connected using the connecting assembly to isolate it from the high-temperature flue gas. After all installations are completed, the purge pipeline assembly on the compressed air sleeve can be closed, allowing the wear-resistant thermocouple to slowly heat up. Therefore, it can be seen that the online replacement device of this application can replace the bed temperature element online while ensuring the personal safety of the operators, thus ensuring the safe and stable operation of the unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the online replacement device for bed temperature elements in a circulating fluidized bed boiler according to this application;

[0018] In the diagram: 1. Primary valve of the measuring pipeline; 2. Secondary valve of the measuring pipeline; 3. Primary valve of the purging pipeline; 4. Secondary valve of the purging pipeline; 5. Prefabricated temperature sleeve; 6. Pressure gauge of the purging pipeline; 7. Temperature gauge of the purging pipeline; 8. Circulating fluidized bed body; 9. Connecting flange; 10. Wear-resistant thermocouple; 11. Compressed air storage tank; 12. Compressed air sleeve. Detailed Implementation

[0019] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0020] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The existing measurement method involves inserting the bed temperature element into the furnace through a prefabricated temperature sleeve, with external flange connection to prevent flue gas from escaping. However, since it cannot isolate the high-temperature flue gas in the furnace, online replacement will cause the high-temperature flue gas to escape, resulting in personal injury or death.

[0025] Based on this, this application provides an online replacement device for bed temperature elements in a circulating fluidized bed boiler, which can replace bed temperature elements online while ensuring the personal safety of operators, thus ensuring the safe and stable operation of the unit.

[0026] Please see Figure 1 This application provides an online replacement device for bed temperature elements in a circulating fluidized bed boiler, comprising: a circulating fluidized bed body 8, a pre-fabricated temperature sleeve 5, a compressed air sleeve 12, a measuring pipeline assembly, a purge pipeline assembly, a purge pipeline pressure gauge 6, a purge pipeline temperature gauge 7, and a connecting assembly; the pre-fabricated temperature sleeve 5 is connected to the circulating fluidized bed body 8, the pre-fabricated temperature sleeve 5 is connected to the compressed air sleeve 12, the measuring pipeline assembly is installed on the pre-fabricated temperature sleeve 5, the purge pipeline assembly is installed on the compressed air sleeve 12, the purge pipeline pressure gauge 6 and the purge pipeline temperature gauge 7 are both installed on the compressed air sleeve 12, the pre-fabricated temperature sleeve 5 is used to house a wear-resistant thermocouple 10, and the connecting assembly is installed on one side of the pre-fabricated temperature sleeve 5.

[0027] In this embodiment, during normal temperature measurement of the circulating fluidized bed 8, the measuring pipeline assembly is in the open state, while the purging pipeline assembly is in the closed state. Operators can measure the bed temperature of the circulating fluidized bed 8 through the measuring pipeline assembly and the prefabricated temperature sleeve 5. In practical applications, if operators discover that the temperature element is damaged, causing some areas within the circulating fluidized bed boiler furnace to lose temperature monitoring, then the temperature element needs to be replaced online. Specifically, when replacing the temperature element online, first check if the reading of the pressure gauge 6 in the purge line is normal. If it is normal, open the purge line assembly in sequence. After purge for a certain period of time, if the reading of the temperature gauge 7 in the purge line is normal, the operator should slowly pull out the wear-resistant thermocouple 10. During the process, the operator should wear heat-resistant clothing and high-temperature gloves to avoid burns caused by minor air leakage. It should be noted that when the operator pulls out the wear-resistant thermocouple 10, the measuring line assembly should not be completely closed only after the wear-resistant thermocouple 10 has been completely pulled out, but rather closed off step by step. Specifically, after the worker pulls the wear-resistant thermocouple 10 out to the primary valve 1 of the measuring pipeline, the primary valve 1 of the measuring pipeline should be closed quickly. At this time, the wear-resistant thermocouple 10 is between the primary valve 1 and the secondary valve 2 of the measuring pipeline. By quickly closing the primary valve 1 of the measuring pipeline, the flue gas can be effectively isolated. When the worker completely pulls the wear-resistant thermocouple 10 out of the prefabricated temperature sleeve 5, the secondary valve 2 of the measuring pipeline should be closed quickly.

[0028] After removing the damaged wear-resistant thermocouple 10, a new wear-resistant thermocouple 10 needs to be inserted into the prefabricated temperature sleeve 5. The wear-resistant thermocouple 10 can be used to monitor the temperature of the area inside the furnace. It should be noted that before inserting the wear-resistant thermocouple 10, the purge pipeline assembly on the compressed air sleeve 12 should be open, while the measuring pipeline assembly on the prefabricated temperature sleeve 5 should be closed. Specifically, when inserting the wear-resistant thermocouple 10, the secondary valve 2 and the primary valve 1 of the measuring pipeline should be opened sequentially. After the wear-resistant thermocouple 10 is fully inserted into the prefabricated temperature sleeve 5, it should be connected using the connecting flange 9, and a graphene gasket should be installed to isolate the high-temperature flue gas. After the wear-resistant thermocouple 10 is fully installed in the prefabricated temperature sleeve 5, the operator should close the purge pipeline assembly on the compressed air sleeve 12, allowing the wear-resistant thermocouple 10 to heat up slowly.

[0029] Optionally, the compressed air sleeve 12 and the pre-temperature sleeve 5 are integrally formed, and the compressed air sleeve 12 and the pre-temperature sleeve 5 are in communication.

[0030] In this embodiment, the compressed air sleeve 12 is connected to the pre-temperature sleeve 5. The connection between the compressed air sleeve 12 and the pre-temperature sleeve 5 is integrally formed, meaning that the connection between the compressed air sleeve 12 and the pre-temperature sleeve 5 is non-detachable, such as welding or integral casting. In this application, the connection method between the compressed air sleeve 12 and the pre-temperature sleeve 5 is not specifically limited, and can be set according to the actual situation.

[0031] Optionally, the measuring pipeline assembly includes a primary measuring pipeline gate 1 and a secondary measuring pipeline gate 2. Both the primary measuring pipeline gate 1 and the secondary measuring pipeline gate 2 are installed on the prefabricated temperature sleeve 5, and a preset distance is provided between the primary measuring pipeline gate 1 and the secondary measuring pipeline gate 2.

[0032] In this embodiment, the primary valve 1 of the measuring pipeline is located on one side of the connection between the compressed air sleeve 12 and the pre-temperature sleeve 5, that is, the primary valve 1 of the measuring pipeline is close to the connection between the compressed air sleeve 12 and the pre-temperature sleeve 5. The distance between the primary valve 1 and the secondary valve 2 of the measuring pipeline can be set according to the actual situation, and is not specifically limited here.

[0033] When measuring the temperature inside the prefabricated temperature sleeve 5, the primary valve 3 and the secondary valve 4 of the purge pipeline should be closed, while the primary valve 1 and the secondary valve 2 of the measuring pipeline should be fully opened. The wear-resistant thermocouple 10 is inserted into the prefabricated temperature sleeve 5, and the outside is connected by a flange. A graphene gasket should be installed in the middle of the flange to ensure that the high-temperature flue gas will not burn the external temperature measuring element.

[0034] The primary valve 1 and secondary valve of the measuring pipeline should be high-temperature resistant ball valves with a valve body diameter slightly larger than that of the wear-resistant thermocouple 10. The primary valve 1 and secondary valve 2 of the measuring pipeline should be separated by a certain distance to allow time to close the primary valve 1 when replacing the wear-resistant thermocouple 10, thereby promptly blocking the flue gas circuit. After closing the primary valve 1, the secondary valve 2 of the measuring pipeline should be closed as soon as possible to completely seal the measuring system and ensure the safety of the operators.

[0035] Optionally, the purge pipeline assembly includes a primary purge pipeline door 3 and a secondary purge pipeline door 4. Both the primary purge pipeline door 3 and the secondary purge pipeline door 4 are installed on the compressed air sleeve 12, and a preset distance is provided between the primary purge pipeline door 3 and the secondary purge pipeline door 4.

[0036] In this embodiment, the purge line pressure gauge 6 is positioned above the primary purge line valve 3, the purge line temperature gauge 7 is positioned above the purge line pressure gauge 6, and the purge line secondary valve 4 is positioned on one side of the connection between the compressed air sleeve 12 and the pre-temperature sleeve 5, that is, the purge line secondary valve 4 is close to the connection between the compressed air sleeve 12 and the pre-temperature sleeve 5. The distance between the primary purge line valve 3 and the secondary purge line valve 4 can be set according to the actual situation, and is not specifically limited here.

[0037] Because there is a gap between the wear-resistant thermocouple 10 and the prefabricated temperature sleeve 5, fine ash from the bed material can enter this gap during unit operation, causing blockage of the wear-resistant thermocouple 10 and making it difficult to extract it from the prefabricated temperature sleeve 5. Therefore, when replacing the wear-resistant thermocouple 10 online, the primary valve 3 and secondary valve 4 of the purge pipeline on the compressed air sleeve 12 should be opened first to purge the accumulated ash inside the prefabricated temperature sleeve 5. Before opening the primary valve 3 and secondary valve 4 of the purge pipeline, the reading of the pressure gauge 6 of the purge pipeline should be checked to ensure it is normal. If the pressure is normal, after opening the primary valve 3 and secondary valve 4 of the purge pipeline, the reading of the temperature gauge 7 of the purge pipeline should be observed for any abnormal temperature rise, thus confirming that the flue gas in the furnace has not backflowed into the compressed air sleeve 12.

[0038] One end of the compressed air sleeve 12 is connected to an external compressed air tank 11, and the set compressed air pressure is 0.6 MPa, which is greater than the internal pressure of the furnace. The primary valve 3 and the secondary valve 4 of the purge pipeline are both high-temperature resistant valves to prevent high-temperature flue gas from damaging the purge pipeline components during normal measurement.

[0039] The primary valve 3 and the secondary valve 4 of the purging pipeline are both double-sealed, which can effectively prevent compressed air from leaking in during normal measurement, reducing the bed temperature measurement value, and thus affecting the accuracy of the measurement.

[0040] In practical applications, specifically when replacing temperature elements online, first check if the reading of pressure gauge 6 in the purge line is normal. If it is normal, open the primary valve 3 and the secondary valve 4 of the purge line in sequence. After purge for a certain period of time, if the reading of temperature gauge 7 in the purge line is normal, the operator should slowly pull out the wear-resistant thermocouple 10. During this process, the operator should wear heat-resistant clothing and high-temperature gloves to avoid burns caused by minor air leaks. It should be noted that when the operator pulls out the wear-resistant thermocouple 10, Instead of completely shutting down the measuring pipeline assembly only after the wear-resistant thermocouple 10 has been completely withdrawn, the assembly is shut down and blocked step by step. Specifically, when the worker withdraws the wear-resistant thermocouple 10 to the primary valve 1 of the measuring pipeline, the primary valve 1 of the measuring pipeline should be closed quickly. At this time, the wear-resistant thermocouple 10 is between the primary valve 1 and the secondary valve 2 of the measuring pipeline. By quickly closing the primary valve 1 of the measuring pipeline, the flue gas can be effectively isolated. When the worker completely withdraws the wear-resistant thermocouple 10 from the prefabricated temperature sleeve 5, the secondary valve 2 of the measuring pipeline should be closed quickly.

[0041] After removing the damaged wear-resistant thermocouple 10, a new wear-resistant thermocouple 10 needs to be inserted into the prefabricated temperature sleeve 5. The wear-resistant thermocouple 10 can be used to monitor the temperature of the area inside the furnace. It should be noted that before inserting the wear-resistant thermocouple 10, the primary valve 3 and secondary valve 4 of the purge line on the compressed air sleeve 12 are both open, while the primary valve 1 and secondary valve 2 of the measuring line on the prefabricated temperature sleeve 5 are closed. Specifically, when inserting the wear-resistant thermocouple 10, the secondary valve 2 and primary valve 1 of the measuring line should be opened sequentially. After the wear-resistant thermocouple 10 is fully inserted into the prefabricated temperature sleeve 5, it should be connected using the connecting flange 9, and a graphene gasket should be installed to isolate the high-temperature flue gas. After the wear-resistant thermocouple 10 is fully installed in the prefabricated temperature sleeve 5, the operator can use the purge line assembly on the compressed air sleeve 12 to slowly heat the wear-resistant thermocouple 10.

[0042] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online replacement device for bed temperature elements in a circulating fluidized bed boiler, characterized in that, include: The circulating fluidized bed body, prefabricated temperature sleeve, compressed air sleeve, measuring pipeline assembly, purging pipeline assembly, purging pipeline pressure gauge, purging pipeline temperature gauge, and connecting assembly; The prefabricated temperature sleeve is connected to the circulating fluidized bed body and the compressed air sleeve. The measuring pipeline assembly is installed on the prefabricated temperature sleeve, and the purging pipeline assembly is installed on the compressed air sleeve. The purging pipeline pressure gauge and the purging pipeline temperature gauge are both installed on the compressed air sleeve. The prefabricated temperature sleeve is used to place a wear-resistant thermocouple. The connecting assembly is installed on one side of the prefabricated temperature sleeve. The measuring pipeline assembly includes a primary measuring pipeline valve and a secondary measuring pipeline valve. Both the primary and secondary measuring pipeline valves are installed on the prefabricated temperature sleeve. A preset distance is provided between the primary and secondary measuring pipeline valves. The primary measuring pipeline valve is located on one side of the connection between the compressed air sleeve and the prefabricated temperature sleeve.

2. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 1, characterized in that, The compressed air sleeve and the pre-formed temperature sleeve are integrally formed, and the compressed air sleeve and the pre-formed temperature sleeve are in communication.

3. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 1, characterized in that, The purging pipeline assembly includes a primary purging pipeline valve and a secondary purging pipeline valve. Both the primary purging pipeline valve and the secondary purging pipeline valve are installed on the compressed air sleeve, and a preset distance is provided between the primary purging pipeline valve and the secondary purging pipeline valve.

4. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 3, characterized in that, The pressure gauge of the purging line is located above the primary valve of the purging line, and the temperature gauge of the purging line is located above the pressure gauge of the purging line.

5. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 3, characterized in that, The secondary valve of the purging pipeline is located on one side of the connection between the compressed air sleeve and the pre-temperature sleeve.

6. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 1, characterized in that, The connection assembly includes a connecting flange and a graphene gasket. One end of the prefabricated temperature sleeve is inserted into the circulating fluidized bed body, and the other end of the prefabricated temperature sleeve is detachably equipped with the connecting flange and the graphene gasket.

7. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 1, characterized in that, The other end of the compressed air sleeve is connected to an external compressed air storage tank, and the connection between the compressed air sleeve and the external compressed air storage tank is sealed.

8. The online replacement device for bed temperature elements in a circulating fluidized bed boiler according to claim 1, characterized in that, The primary valve of the measuring pipeline, the secondary valve of the measuring pipeline, the primary valve of the purging pipeline, and the secondary valve of the purging pipeline are all high-temperature resistant valves.

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