Thermocouple replacement device and method

Abstract

The present application discloses a thermocouple replacement device and method, which belongs to the field of petrochemical technology. Under the impetus of air added in the reverse direction, the cylinder carries the first thermocouple to push out of the sealing box, the gas pipeline introduces the medium gas into the combustion furnace via the preheating pipeline, the closed ball valve isolates the inner cavity of the sealing box from the combustion furnace, and under the condition that the gas pipeline and the preheating pipeline are in a closed state and the sealing box is in an open state, the connecting rod is disconnected; the first thermocouple is replaced by the second thermocouple, the sealing box is in a closed state, the cylinder and the second thermocouple are connected by the connecting rod, the preheating pipeline is opened, and the medium gas heats the second thermocouple, under the condition that the preheating pipeline is closed and the ball valve is opened, the cylinder carries the second thermocouple into the combustion furnace under the impetus of air added in the forward direction, and the replacement of the thermocouple is completed under the condition that the combustion furnace works normally and the medium gas is prevented from leaking, which simplifies the operation of replacing the thermocouple and improves the replacement efficiency.

Description

Technical Field

[0001] The present application relates to the field of petrochemical technology, and in particular to a thermocouple replacement device and method. Background Art

[0002] The combustion furnace can burn various substances to achieve material recovery. During the combustion process of the combustion furnace, a thermocouple needs to be placed to detect the temperature in the combustion furnace to determine whether the combustion furnace is in a safe operating state. In the related art, the thermocouple is easily damaged by the substances burned in the combustion furnace or the high temperature. Therefore, the combustion furnace needs to be shut down to complete the replacement of the thermocouple, which leads to a complicated process for replacing the thermocouple and low replacement efficiency. Summary of the invention

[0003] The embodiment of the present application provides a thermocouple replacement device and method, which completes the replacement of the thermocouple while preventing the leakage of the medium gas, simplifies the operation of replacing the thermocouple, and improves the replacement efficiency. The technical solution provided by the embodiment of the present application is as follows:

[0004] On the one hand, an embodiment of the present application provides a thermocouple replacement device, the device comprising: a cylinder, a sealing box, a gas pipeline, a preheating pipeline and a ball valve; the cylinder and the first thermocouple are connected by a connecting rod, the inner diameter of the sealing box is larger than the outer diameter of the first thermocouple, the sealing box is connected to the ball valve, the first ends of the gas pipeline and the preheating pipeline are respectively connected to the inner cavity of the sealing box, and the second end of the preheating pipeline is connected to the inner cavity of the combustion furnace;

[0005] The cylinder is used to carry the first thermocouple out of the sealing box under the push of the air added in the reverse direction; the gas pipeline is used to introduce the medium gas into the combustion furnace via the preheating pipeline; the ball valve in the closed state is used to isolate the inner cavity of the sealing box from the combustion furnace;

[0006] Wherein, when the gas pipeline and the preheating pipeline are in a closed state and the sealing box is in an open state, the connecting rod is disconnected; after the first thermocouple is replaced by the second thermocouple, the sealing box is in a closed state, and the cylinder and the second thermocouple are connected through the connecting rod; the medium gas is used to heat the second thermocouple when the preheating pipeline is in an open state; and when the preheating pipeline is in a closed state and the ball valve is in an open state, the cylinder is used to carry the second thermocouple into the combustion furnace under the impetus of the positively added air.

[0007] In a possible implementation, the first thermocouple includes a thermocouple junction box, a sealing surface, a sleeve, a thermoelectrode and corundum, the thermocouple junction box is connected to the sleeve, and the thermocouple junction box is connected to the thermoelectrode, the sealing surface is located inside the sleeve, and the sealing surface is connected to the thermocouple junction box, and the corundum is bonded to the lower part of the sleeve;

[0008] The thermocouple junction box is used to supply power to the thermoelectrode;

[0009] The hot electrode is used to detect the temperature inside the combustion furnace;

[0010] The sealing surface is used to isolate the thermocouple junction box from the interior of the combustion furnace;

[0011] The sleeve and the corundum are used to isolate the medium gas in the combustion furnace.

[0012] In another possible implementation, the temperature to which the sleeve is subjected is not less than 1000 degrees Celsius.

[0013] In another possible implementation, the sleeve includes a stainless steel cylinder.

[0014] In another possible implementation, the sealing box includes a sealing cover and a sealing cylinder, and the sealing cover is connected to the sealing cylinder;

[0015] The sealing cover is used to compress the thermocouple;

[0016] The inner diameter of the sealing cylinder is larger than the outer diameter of the thermocouple.

[0017] In another possible implementation, the gas input by the gas pipeline includes nitrogen.

[0018] In another possible implementation, the device further includes a first valve, wherein the first valve is connected to the preheating pipeline;

[0019] The first valve is used to control the opening or closing of the preheating pipeline.

[0020] In another possible implementation, the device further includes a second valve, wherein the second valve is connected to the gas pipeline;

[0021] The second valve is used to control the opening or closing of the gas pipeline.

[0022] In another possible implementation, the temperature to which the ball valve is subjected is not less than 1000 degrees Celsius.

[0023] On the other hand, an embodiment of the present application provides a thermocouple replacement method, which is applied to a thermocouple replacement device, wherein the thermocouple replacement device includes: a cylinder, a sealing box, a gas pipeline, a preheating pipeline and a ball valve, wherein the cylinder and the first thermocouple are connected by a connecting rod, the inner diameter of the sealing box is larger than the outer diameter of the first thermocouple, the sealing box is connected to the ball valve, the first ends of the gas pipeline and the preheating pipeline are respectively connected to the inner cavity of the sealing box, and the second end of the preheating pipeline is connected to the inner cavity of the combustion furnace; the method includes:

[0024] Adding air to the cylinder in a reverse direction, so that the cylinder, under the push of the air added in a reverse direction, carries the first thermocouple out of the sealing box;

[0025] Controlling the ball valve to close, the ball valve isolating the inner cavity of the sealing box from the combustion furnace;

[0026] Inputting gas into the gas pipeline, and introducing the medium gas into the combustion furnace via the preheating pipeline;

[0027] Control the gas delivery pipeline and the preheating pipeline to close, control the sealing box to open, and disconnect the connecting rod;

[0028] replacing the first thermocouple with a second thermocouple, controlling the sealing box to close, and connecting the cylinder and the second thermocouple via the connecting rod;

[0029] Controlling the preheating pipeline to open, so that the medium gas in the combustion furnace heats the second thermocouple;

[0030] Control the preheating pipeline to close and the ball valve to open;

[0031] Air is positively added to the cylinder, and the cylinder carries the second thermocouple into the combustion furnace under the impetus of the positively added air.

[0032] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0033] The solution provided in the embodiment of the present application isolates the sealing box from the combustion furnace, and the gas pipeline and the preheating pipeline in the open state introduce the medium gas in the sealing box into the combustion furnace. The ball valve, the gas pipeline and the preheating pipeline in the closed state isolate the sealing box from the combustion furnace. The thermocouple is replaced without discharging the medium gas, and the replaced thermocouple is heated. The thermocouple enters the combustion furnace driven by the cylinder to complete the replacement of the thermocouple in the combustion furnace. The replacement of the thermocouple is completed when the combustion furnace is operating normally and the medium gas leakage is prevented, which simplifies the operation of replacing the thermocouple and improves the replacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a structural schematic diagram of a thermocouple replacement device provided in an embodiment of the present application.

[0036] Figure 2 It is a schematic diagram of the structure of a first thermocouple provided in an embodiment of the present application.

[0037] Figure 3 It is a flow chart of a thermocouple replacement method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0039] It is understood that the terms "first", "second", "third", "fourth", "fifth", "sixth", etc. used in this application can be used in this article to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of this application, the first arrangement order can be called the second arrangement order, and the second arrangement order can be called the first arrangement order.

[0040] The terms "each", "multiple", "at least one", "any" and the like used in this application include one, two or more than two, multiple include two or more than two, each refers to each of the corresponding multiple, and any refers to any one of the multiple. For example, multiple elements include 3 elements, and each refers to each of the 3 elements, and any refers to any one of the 3 elements, which can be the first, the second, or the third.

[0041] During the combustion process, the combustion furnace involved in the present application uses a thermocouple to measure the temperature inside the combustion furnace, and then adjusts the combustion temperature inside the combustion furnace according to the measured temperature, so that the combustion temperature inside the combustion furnace is controlled within a predetermined temperature range. However, if the thermocouple used to measure the combustion temperature in the combustion furnace is damaged, the thermocouple replacement device provided in the embodiment of the present application is used to replace the thermocouple when the combustion furnace is operating normally, thereby improving the efficiency of thermocouple replacement.

[0042] Figure 1is a schematic diagram of the structure of a thermocouple replacement device provided in an embodiment of the present application, see Figure 1 The device includes: a cylinder 1, a sealing box 2, a gas transmission pipeline 3, a preheating pipeline 4 and a ball valve 5.

[0043] Among them, the cylinder 1 and the first thermocouple are connected by a connecting rod, the inner diameter of the sealing box 2 is larger than the outer diameter of the first thermocouple, the sealing box 2 is connected to the ball valve 5, the first ends of the gas pipeline 3 and the preheating pipeline 4 are respectively connected to the inner cavity of the sealing box 2, and the second end of the preheating pipeline 4 is connected to the inner cavity of the combustion furnace.

[0044] Optionally, the combustion furnace is used to recover sulfur, or to recover other substances. The combustion furnace will produce medium gas during the combustion recovery process. If the thermocouple is replaced, the combustion furnace needs to be closed to prevent leakage of the medium gas. For example, if the combustion furnace is used to recover sulfur, hydrogen chloride is produced during the recovery process, that is, the medium gas is hydrogen chloride gas. Alternatively, if the combustion furnace is used to recover other substances, the medium gas is other gases.

[0045] Optionally, the inner wall of the combustion furnace includes a heat insulation layer and a refractory layer. The heat insulation layer is used to isolate the inner wall of the combustion furnace from the refractory layer, thereby preventing the outer wall temperature of the combustion furnace from being too high and scalding the staff. The refractory layer is used to isolate the flame in the combustion furnace and prevent damage to the heat insulation layer.

[0046] In the embodiment of the present application, the cylinder 1 can reciprocate up and down according to the air added. For example, if air is added in the reverse direction to the cylinder 1, the cylinder 1 can move upward, and if air is added in the forward direction to the cylinder 1, the cylinder 1 can move downward. The cylinder 1 and the first thermocouple are connected by a connecting rod, so when the cylinder 1 moves upward or downward, the connecting rod drives the first thermocouple to move upward or downward.

[0047] Optionally, the connecting rod can be disconnected or connected, thereby achieving the disconnection or connection between the cylinder 1 and the thermocouple. If the connecting rod between the cylinder 1 and the thermocouple is disconnected, the thermocouple is disassembled, and if the connecting rod between the cylinder 1 and the thermocouple is connected, the thermocouple is installed.

[0048] In addition, if the inner diameter of the sealing box 2 is larger than the outer diameter of the first thermocouple, the first thermocouple can pass through the inner cavity of the sealing box 2 and enter the combustion furnace. For example, the inner diameter of the sealing box 2 is 20 cm, and the outer diameter of the first thermocouple is 17 cm, or the inner diameter of the sealing box 2 and the outer diameter of the first thermocouple are other values, and it is only necessary to ensure that the inner diameter of the sealing box 2 is larger than the outer diameter of the first thermocouple, and the embodiments of the present application are not limited thereto.

[0049] Optionally, the sealing box 2 provided in the embodiment of the present application includes a sealing cover and a sealing cylinder, and the sealing cover is connected to the sealing cylinder. For example, the sealing cover and the sealing cylinder are connected by threads, or the sealing cover and the sealing cylinder are connected by other means.

[0050] The sealing cover is used to compress the thermocouple to prevent a gap from appearing between the sealing cover and the thermocouple, thereby preventing the medium gas from leaking through the gap. The inner diameter of the sealing cylinder is larger than the outer diameter of the thermocouple, thereby ensuring that the thermocouple can pass through the sealing cylinder.

[0051] In addition, the sealing box 2 in the embodiment of the present application is connected to the ball valve 5, which can be opened or closed. If the ball valve 5 is in the open state, the sealing box 2 is connected to the inner cavity of the combustion furnace, and if the ball valve 5 is closed, the sealing box 2 is isolated from the combustion furnace.

[0052] It should be noted that the ball valve 5 in the embodiment of the present application is opened or closed manually, or opened or closed electrically, and the embodiment of the present application is not limited thereto.

[0053] Optionally, the temperature of the ball valve 5 is not less than 1000 degrees Celsius. In the embodiment of the present application, the ball valve 5 is close to the combustion furnace, and the medium gas in the combustion furnace is close to the ball valve 5. In order to prevent the ball valve 5 from being damaged by the temperature, the temperature that the ball valve 5 can withstand is not less than 1000 degrees Celsius.

[0054] The first ends of the gas pipeline 3 and the preheating pipeline 4 in the thermocouple replacement device are respectively connected to the inner cavity of the sealing box 2, and the second end of the preheating pipeline 4 is connected to the inner cavity of the combustion furnace, which also shows that the preheating pipeline 4 can connect the sealing box 2 with the inner cavity of the combustion furnace. If the gas pipeline 3 inputs gas into the sealing box 2, the input gas can push the medium gas in the sealing box 2 into the preheating pipeline 4, and then the medium gas is introduced into the inner cavity of the combustion furnace.

[0055] The connection position between the gas supply pipeline 3 and the preheating pipeline 4 in the embodiment of the present application is isolated by a ball valve 5. If the ball valve 5 is closed, the space between the input pipeline 3 and the preheating pipeline 4 is isolated. By inputting gas into the gas supply pipeline 3, the medium gas in the sealing box 2 is pushed into the preheating pipeline 4, and then the medium gas is introduced into the inner cavity of the combustion furnace.

[0056] Optionally, the device provided in the present application further includes a first valve, which is connected to the preheating pipeline 4 and is used to control the opening or closing of the preheating pipeline 4. For example, if the preheating pipeline 4 needs to be opened, the first valve is opened to open the preheating pipeline 4. If the preheating pipeline 4 needs to be closed, the first valve is closed to close the preheating pipeline 4.

[0057] Optionally, the device provided in the present application further includes a second valve, which is connected to the gas pipeline 3 and is used to control the opening or closing of the gas pipeline 3. For example, if the gas pipeline 3 needs to be opened, the second valve is opened to open the gas pipeline 3, and if the gas pipeline 3 needs to be closed, the second valve is closed to close the gas pipeline 3.

[0058] The embodiment of the present application describes the structure of the thermocouple replacement device in the above manner. Next, the process of replacing a thermocouple using the thermocouple replacement device is described.

[0059] In the present application, if the thermocouple used to measure the combustion furnace is damaged, the device provided in the embodiment of the present application is used to replace the thermocouple. Air is added to the cylinder 1 in the reverse direction. Under the push of the air added in the reverse direction, the cylinder 1 carries the first thermocouple connected by the connecting rod to push out the sealing box. After the cylinder 1 carries the first thermocouple out of the sealing box, the medium gas in the inner cavity of the combustion furnace will also reversely enter the cylinder 1 and the sealing box 2. The medium gas entering the cylinder 1 and the sealing box 2 needs to be introduced into the combustion furnace to prevent leakage of the medium gas.

[0060] Before the medium gas is introduced into the combustion furnace, the ball valve 5 is closed first, so that the ball valve 5 isolates the sealing box 2 from the combustion furnace. In addition, in the process of introducing the medium gas into the combustion furnace, the first end of the preheating pipeline 4 is connected to the sealing box 2, and the second end of the preheating pipeline 4 is connected to the inside of the combustion furnace. Therefore, the preheating pipeline 4 connects the sealing box 2 and the combustion furnace. When gas is input into the sealing box 2 through the gas transmission pipeline 3, the input gas can drive the medium gas to be introduced into the inner cavity of the combustion furnace through the preheating pipeline 4, so as to prevent the leakage of the medium gas.

[0061] In the process of inputting gas into the sealing box 2 through the gas pipeline 3, the pressure in the sealing box 2 will gradually increase, while the pressure in the inner cavity of the combustion furnace remains unchanged. If the pressure in the sealing box 2 is greater than the pressure in the inner cavity of the combustion furnace, the gas in the sealing box 2 can be introduced into the combustion furnace through the preheating pipeline 4.

[0062] Optionally, the gas input through the gas pipeline 3 includes nitrogen, or includes other types of inert gases, which is not limited in the embodiments of the present application.

[0063] Optionally, a preset volume of gas is input into the sealing box 2 through the gas pipeline 3 to ensure that all the medium gas is introduced into the combustion furnace. The preset volume is set by the operator or in other ways.

[0064] The gas delivery pipeline and preheating pipeline in the embodiment of the present application can introduce the medium gas in the sealing box into the combustion furnace, prevent the leakage of the medium gas, and ensure the safety of replacing the thermocouple.

[0065] In addition, after the medium gas is introduced into the combustion furnace through the gas pipeline 3 and the preheating pipeline 4, the gas pipeline 3 and the preheating pipeline 4 are closed. At this time, the sealing box 2 and the combustion furnace are in an isolated state, and the medium gas in the combustion furnace cannot enter the sealing box 2. At this time, the replacement of the first thermocouple is completed.

[0066] After replacing the first thermocouple, disconnect the connecting rod while the sealing box 2 is in the open state. After replacing the first thermocouple with the second thermocouple, close the sealing box 2 and connect the cylinder 1 and the second thermocouple through the connecting rod. When the preheating pipeline 4 is in the open state, the medium gas heats the second thermocouple. When the preheating pipeline 4 is in the closed state and the ball valve 5 is in the open state, positively add air to the cylinder 1. Driven by the positively added air, the cylinder 1 carries the second thermocouple into the combustion furnace.

[0067] Optionally, the replaced second thermocouple can detect the temperature of the current environment. Therefore, in the process of heating the second thermocouple through the preheating pipeline 4, the current heated temperature can be measured by the second thermocouple. If the current heated temperature of the second thermocouple meets the heating conditions, the heating of the second thermocouple can be stopped and the second thermocouple can be sent to the combustion furnace.

[0068] The heating condition is greater than 800 degrees Celsius, greater than 900 degrees Celsius, or greater than other temperatures.

[0069] In the embodiment of the present application, after the first thermocouple is replaced by the second thermocouple, the medium gas is brought close to the second thermocouple through the preheating pipeline. Since the medium gas starts from the combustion furnace, the medium gas carries heat. After the medium gas approaches the second thermocouple, the second thermocouple can be heated to prevent the second thermocouple from exploding when entering the combustion furnace at a low temperature, thereby improving the safety of replacing the thermocouple.

[0070] The process of replacing the first thermocouple includes:

[0071] Open the sealing box 2 and disconnect the connecting rod connecting the first thermocouple and the cylinder 1. At this time, the first thermocouple can be removed and a new second thermocouple can be installed to replace the first thermocouple. Close the sealing box 2 and connect the second thermocouple and the cylinder 1 through the connecting rod. At this time, the second thermocouple can move with the movement of the cylinder 1.

[0072] Open the preheating pipeline 4. At this time, the medium gas in the combustion furnace enters the sealing box 2 through the preheating pipeline 4. Since the medium gas has temperature, it can heat the second thermocouple located in the sealing box 2. After the second thermocouple is heated to the required working temperature, the preheating pipeline 4 is closed and the ball valve 5 is opened. At this time, the sealing box 2 is connected with the combustion furnace. By positively adding air to the cylinder 1, the cylinder 1 is pushed by the positively added air and carries the second thermocouple into the combustion furnace. At this time, the replacement of the thermocouple is completed.

[0073] The thermocouple replacement device provided in the embodiment of the present application isolates the sealing box from the combustion furnace. The gas pipeline and the preheating pipeline in the open state introduce the medium gas in the sealing box into the combustion furnace. The ball valve, the gas pipeline and the preheating pipeline in the closed state isolate the sealing box from the combustion furnace. The thermocouple is replaced without discharging the medium gas, and then the replaced thermocouple is heated. The thermocouple enters the combustion furnace driven by the cylinder to complete the replacement of the thermocouple in the combustion furnace. The replacement of the thermocouple is completed when the combustion furnace is operating normally and the medium gas leakage is prevented. The operation of replacing the thermocouple is simplified and the replacement efficiency is improved.

[0074] Optionally, Figure 2 It is a structural schematic diagram of a first thermocouple provided in an embodiment of the present application. The first thermocouple in the embodiment of the present application includes a thermocouple junction box 11, a sealing surface 12, a sleeve 13, a thermoelectrode 14 and a corundum 15. The thermocouple junction box 11 is connected to the sleeve 13, and the thermocouple junction box 11 is connected to the thermoelectrode 14. The sealing surface 12 is located inside the sleeve, and the sealing surface 12 is connected to the thermocouple junction box 11. The corundum 15 is bonded to the lower part of the sleeve 13.

[0075] In the embodiment of the present application, after the thermocouple junction box 11 is connected to the thermoelectrode 14, the thermocouple junction box 11 is used to supply power to the thermoelectrode 14, and the thermoelectrode 14 is used to detect the temperature inside the combustion furnace, and then the measured temperature is transmitted to the outside through the thermocouple junction box 11 to be fed back to the operator.

[0076] The first thermocouple needs to enter the interior of the combustion furnace, and the combustion furnace includes a medium gas. In order to prevent the medium gas in the combustion furnace from being diffused through the first thermocouple, a sealing surface 12 is provided inside the thermocouple. The sealing surface 12 isolates the thermocouple junction box 11 from the interior of the combustion furnace, thereby preventing the medium gas in the combustion furnace from entering the thermocouple junction box 11 and causing the medium gas to diffuse. The sleeve 13 and the corundum 15 are used to isolate the medium gas in the combustion furnace to prevent the medium gas in the combustion furnace from damaging the hot electrode 14.

[0077] Optionally, the temperature of the sleeve 13 is not less than 1000 degrees Celsius. In the embodiment of the present application, since the working environment of the first thermocouple is an environment with too high temperature, in order to ensure the normal operation of the first thermocouple, the temperature of the sleeve 13 should not be less than 1000 degrees Celsius.

[0078] Optionally, the sleeve 13 includes a stainless steel tube, or a tube made of other materials, which is not limited in the embodiment of the present application.

[0079] It should be noted that the structure of the second thermocouple in the embodiment of the present application is the same as that of the first thermocouple, and the structure of the second thermocouple will not be described in detail herein.

[0080] The above embodiments are all described by taking the structure of the thermocouple replacement device as an example, and the function of each structure in the thermocouple replacement device is also described. Next, the process of replacing a thermocouple using the thermocouple replacement device will be described. Figure 3 is a flow chart of a thermocouple replacement method provided in an embodiment of the present application, see Figure 3 The method is applied to a thermocouple replacement device, which includes: a cylinder, a sealing box, a gas pipeline, a preheating pipeline and a ball valve, wherein the cylinder and the first thermocouple are connected by a connecting rod, the inner diameter of the sealing box is larger than the outer diameter of the first thermocouple, the sealing box is connected to the ball valve, the first ends of the gas pipeline and the preheating pipeline are respectively connected to the inner cavity of the sealing box, and the second end of the preheating pipeline is connected to the inner cavity of the combustion furnace, and the method includes:

[0081] 301. Add air to the cylinder in a reverse direction. The cylinder, pushed by the air added in a reverse direction, carries the first thermocouple out of the sealing box.

[0082] In the embodiment of the present application, during the combustion process, excessively high temperature and medium gas will be generated inside the combustion furnace, which may damage the thermocouple for measuring the temperature, resulting in damage to the thermocouple and inability to accurately measure the temperature inside the combustion furnace. Therefore, a thermocouple replacement device is required to replace the thermocouple in the combustion furnace.

[0083] If it is determined that the thermocouple needs to be replaced, the damaged first thermocouple must be removed from the combustion furnace and reversely connected to the cylinder. The cylinder moves upward under the push of the reversely added air, and also carries the first thermocouple upward to push out the sealing box.

[0084] 302. Control the ball valve to close, and the ball valve isolates the inner cavity of the sealing box from the combustion furnace.

[0085] After the first thermocouple is extracted from the combustion furnace, the sealing box still contains the medium gas in the combustion furnace. It is necessary to discharge the medium gas in the sealing box into the combustion furnace first so that the sealing box no longer contains the medium gas.

[0086] In the embodiment of the present application, the ball valve is closed first. The closed ball valve can isolate the inner cavity of the sealing box from the combustion furnace, and the medium gas in the combustion furnace can no longer enter the inner cavity of the sealing box.

[0087] 303. Input gas into the gas pipeline, and introduce the medium gas into the combustion furnace through the preheating pipeline.

[0088] After isolating the inner cavity of the sealing box from the combustion furnace by the ball valve, the medium gas contained in the sealing box needs to be discharged into the combustion furnace. At this time, the preheating pipeline still connects the inner cavity of the sealing box with the combustion furnace, so gas is first input into the gas pipeline. The input gas will increase the pressure in the sealing box, and then push the medium gas through the preset pipeline connected to the combustion furnace and then into the combustion furnace.

[0089] 304. Control the gas pipeline and the preheating pipeline to close, control the sealing box to open, and disconnect the connecting rod.

[0090] After the medium gas in the sealing box is discharged into the combustion furnace through step 303, the gas supply pipeline and the preheating pipeline are controlled to be closed. At this time, the inner cavity of the sealing box is completely isolated from the combustion furnace, and the medium gas in the combustion furnace will no longer enter the inner cavity of the sealing box. At this time, the sealing box is opened, the connecting rod between the cylinder and the first thermocouple is disconnected, and the first thermocouple is removed.

[0091] 305. Replace the first thermocouple with the second thermocouple, control the sealing box to close, and connect the cylinder and the second thermocouple through a connecting rod.

[0092] The first thermocouple is replaced by the second thermocouple, the sealing box is closed, and the cylinder and the second thermocouple are connected by a connecting rod. At this time, the cylinder can drive the second thermocouple to move upward or downward again.

[0093] 306. Control the preheating pipeline to open, and the medium gas in the combustion furnace heats the second thermocouple.

[0094] After the second thermocouple is installed, the temperature of the second thermocouple is relatively low. If the second thermocouple is directly installed in the combustion furnace, the second thermocouple may be damaged due to excessive temperature. To prevent the above phenomenon, the preheating pipeline is first controlled to be opened. At this time, the medium gas in the combustion furnace will enter the sealing box through the preheating pipeline, and the heat carried by the medium gas will heat the second thermocouple.

[0095] Furthermore, in an embodiment of the present application, during the process of heating the second thermocouple by the medium gas input through the preheating pipeline, the second thermocouple can display the temperature of the current environment. If the temperature of the second thermocouple reaches the operating temperature, the heating of the second thermocouple can be stopped.

[0096] 307. Control the preheating pipeline to close and the ball valve to open.

[0097] When it is determined that the second thermocouple no longer needs to be heated, the preheating pipeline is closed. At this time, the medium gas in the combustion furnace can no longer enter the sealing box, and the second thermocouple cannot be heated any further. Then the ball valve is opened, and the second thermocouple can pass through to enter the combustion furnace.

[0098] 308. Air is positively added to the cylinder, and the cylinder, driven by the positively added air, carries the second thermocouple into the combustion furnace.

[0099] When it is determined that the second thermocouple needs to be sent into the combustion furnace, air is positively added to the cylinder. At this time, the cylinder moves downward under the impetus of the positively added air, and also carries the second thermocouple downward to enter the combustion furnace.

[0100] It should be noted that the embodiments of the present application are only used to illustrate how to use the thermocouple replacement device to replace the thermocouple. Figure 1 and Figure 2 In the embodiment, the structure of the thermocouple replacement device is described in detail, and the structure of the thermocouple replacement device is also applicable to Figure 3 Thermocouple replacement device in an embodiment.

[0101] The method provided in the embodiment of the present application uses an open gas pipeline and a preheating pipeline to introduce the medium gas in the sealing box into the combustion furnace, isolates the sealing box from the combustion furnace by closing the ball valve and the gas pipeline and the preheating pipeline, replaces the thermocouple, and then heats the replaced thermocouple, and carries the thermocouple into the combustion furnace through the movement of the cylinder. The replacement of the thermocouple is completed when the combustion furnace is operating normally and leakage of the medium gas is prevented, thereby simplifying the operation of replacing the thermocouple and improving the replacement efficiency.

[0102] The above is only to facilitate those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A thermocouple replacement device, characterized in that: The device comprises: a cylinder (1), a sealing box (2), a gas pipeline (3), a preheating pipeline (4) and a ball valve (5); the cylinder (1) and a first thermocouple are connected via a connecting rod, the inner diameter of the sealing box (2) is larger than the outer diameter of the first thermocouple, the sealing box (2) is connected to the ball valve (5), the first ends of the gas pipeline (3) and the preheating pipeline (4) are respectively connected to the inner cavity of the sealing box (2), and the second end of the preheating pipeline (4) is connected to the inner cavity of the combustion furnace; The cylinder (1) is used to carry the first thermocouple out of the sealing box (2) under the impetus of the air added in the reverse direction; the gas pipeline (3) is used to introduce the medium gas into the combustion furnace via the preheating pipeline (4); the ball valve (5) in the closed state is used to isolate the inner cavity of the sealing box (2) from the combustion furnace; Wherein, when the gas delivery pipeline (3) and the preheating pipeline (4) are in a closed state and the sealing box (2) is in an open state, the connecting rod is disconnected; after the first thermocouple is replaced by the second thermocouple, the sealing box (2) is in a closed state, and the cylinder (1) and the second thermocouple are connected via the connecting rod; the medium gas is used to heat the second thermocouple when the preheating pipeline (4) is in an open state; and when the preheating pipeline (4) is in a closed state and the ball valve (5) is in an open state, the cylinder (1) is used to carry the second thermocouple into the combustion furnace under the impetus of the positively added air.

2. The device according to claim 1, characterized in that The first thermocouple comprises a thermocouple junction box (11), a sealing surface (12), a sleeve (13), a thermoelectrode (14) and a corundum (15); the thermocouple junction box (11) is connected to the sleeve (13), and the thermocouple junction box (11) is connected to the thermoelectrode (14); the sealing surface (12) is located inside the sleeve (13), and the sealing surface (12) is connected to the thermocouple junction box (11); and the corundum (15) is bonded to the lower part of the sleeve (13); The thermocouple junction box (11) is used to supply power to the thermoelectrode (14); The hot electrode (14) is used to detect the temperature inside the combustion furnace; The sealing surface (12) is used to isolate the thermocouple junction box (11) from the interior of the combustion furnace; The sleeve (13) and the corundum (15) are used to isolate the medium gas in the combustion furnace.

3. The device according to claim 2, characterized in that The temperature borne by the sleeve (13) is not less than 1000 degrees Celsius.

4. The device according to claim 2, characterized in that The sleeve (13) comprises a stainless steel cylinder.

5. The device according to claim 1, characterized in that The sealing box (2) comprises a sealing cover and a sealing cylinder, wherein the sealing cover is connected to the sealing cylinder; The sealing cover is used to compress the thermocouple; The inner diameter of the sealing cylinder is larger than the outer diameter of the thermocouple.

6. The device according to claim 1, characterized in that The gas input by the gas pipeline (3) includes nitrogen.

7. The device according to claim 1, characterized in that The device further comprises a first valve, wherein the first valve is connected to the preheating pipeline (4); The first valve is used to control the opening or closing of the preheating pipeline (4).

8. The device according to claim 1, characterized in that The device further comprises a second valve, wherein the second valve is connected to the gas transmission pipeline (3); The second valve is used to control the opening or closing of the gas transmission pipeline (3).

9. The device according to claim 1, characterized in that The temperature borne by the ball valve (5) is not less than 1000 degrees Celsius.

10. A method for replacing a thermocouple, characterized in that: Applied to a thermocouple replacement device, the thermocouple replacement device comprises: a cylinder, a sealing box, a gas pipeline, a preheating pipeline and a ball valve, the cylinder and the first thermocouple are connected by a connecting rod, the inner diameter of the sealing box is larger than the outer diameter of the first thermocouple, the sealing box is connected to the ball valve, the first ends of the gas pipeline and the preheating pipeline are respectively connected to the inner cavity of the sealing box, and the second end of the preheating pipeline is connected to the inner cavity of the combustion furnace; the method comprises: Adding air to the cylinder in a reverse direction, so that the cylinder, under the push of the air added in a reverse direction, carries the first thermocouple out of the sealing box; Controlling the ball valve to close, the ball valve isolating the inner cavity of the sealing box from the combustion furnace; Inputting gas into the gas pipeline, and introducing the medium gas into the combustion furnace via the preheating pipeline; Control the gas delivery pipeline and the preheating pipeline to close, control the sealing box to open, and disconnect the connecting rod; replacing the first thermocouple with a second thermocouple, controlling the sealing box to close, and connecting the cylinder and the second thermocouple via the connecting rod; Controlling the preheating pipeline to open, so that the medium gas in the combustion furnace heats the second thermocouple; Control the preheating pipeline to close and the ball valve to open; Air is positively added to the cylinder, and the cylinder carries the second thermocouple into the combustion furnace under the impetus of the positively added air.

Images