Monitoring device for fire facing side temperature of water cooling wall of power station boiler

Abstract

The utility model discloses a power station boiler water cooling wall fire facing side temperature monitoring device, which belongs to the technical field of power station boiler water cooling wall temperature monitoring and comprises a plurality of water cooling pipes and fins. The water cooling pipes and the fins are arranged at intervals; a heat collection block is mounted on the outer surface of the water cooling pipe; fins on the two sides of each water cooling pipe are symmetrically provided with fixing frames, and a fixing structure is installed between the fixing frames on the two sides of each water cooling pipe. The heat collection block is detachably installed on the outer side of the water cooling pipe through a fixing structure. According to the device for monitoring the temperature of the fire-facing side of the water cooling wall of the power station boiler, the heat collection block is detachably installed on the outer side of the water cooling pipe through the fixing structure, disassembly and assembly of the heat collection block and replacement of the temperature sensing probe are facilitated, the heat collection block can be fixed to a proper position according to actual conditions, detection is more convenient, and the detection effect is good.

Description

Technical Field

[0001] The utility model specifically relates to a monitoring device for the temperature of a water-cooled wall of a power station boiler on the fire side, belonging to the technical field of water-cooled wall temperature monitoring of power station boilers. Background Art

[0002] Under the conditions of high-parameter operation and deep peak-shaving operation of generator sets, new challenges are posed to the technical supervision of metal components of power station boilers. Complex operating conditions can easily cause unstable combustion in the furnace of power station boilers, and metal damage problems such as over-temperature operation, low-cycle fatigue damage, and accelerated generation and shedding of oxide scale on the heating surface of the water-cooling tube of the power station boiler facing the fire side. The main factors causing damage to metal components of power stations are temperature, stress and strain, and operating time. Therefore, it is necessary to monitor the factors that cause damage to metal components of power stations, especially temperature factors. Usually, the water vapor mixture flowing in the water-cooling tube of a power station boiler is heated by the combustion flame and high-temperature flue gas in the furnace through radiation, convection, etc. Under normal circumstances, the temperature of the high-temperature flue gas in the furnace is around 2000MW. The temperature of the heating surface is about 1200℃, and the temperature inside the heating surface tube is between 450 and 650℃. The common method for monitoring the temperature of the water-cooled tube heating surface is to install a thermocouple near the tube seat of the inner header of the large package outside the furnace of the power station boiler, and then calculate the tube wall temperature of the water-cooled tube on the fire side in the furnace according to the empirical formula. The temperature measurement of the tube wall in the furnace can also be carried out by precious metal alloy armored thermocouples, but this monitoring equipment is expensive and not suitable for the furnace, especially the high temperature, high wind speed, fly ash and slag wear environment where the water-cooled tube is located. Generally, the precious metal alloy armored thermocouple fails within 2 months, and the replacement of the precious metal alloy armored thermocouple can only be completed under the shutdown condition (generally the shutdown and maintenance cycle is 1 year). This creates a monitoring blind spot in time, making the safe operation of the boiler without support.

[0003] In order to solve the above-mentioned problems, a monitoring device for the fire-facing side temperature of the water-cooled wall of a power station boiler is proposed in the prior art. The device is provided with a temperature sensing probe and a temperature sensing optical fiber inside a heat collecting block, the heat collecting block is installed on the fire-facing side of a water-cooling pipe, and the temperature sensing probe is made to fit with the inner wall of the water-cooling pipe, thereby performing temperature monitoring operation on the fire-facing side of the water-cooled wall of the power station boiler. In order to ensure the connection stability between the heat collecting block and the water-cooling pipe, the heat collecting block and the water-cooling pipe are usually fixedly connected. However, when the temperature sensing probe located inside the heat collecting block is damaged, this fixed connection method is not convenient for removing the heat collecting block and replacing the temperature sensing probe. At the same time, the heat collecting block is fixedly connected to the water-cooling pipe, so that the heat collecting block is in a fixed position, and the temperature sensing probe inside it can only detect the temperature of the fixed position, and the detection effect is limited. Therefore, the present application proposes a new monitoring device for the fire-facing side temperature of the water-cooled wall of a power station boiler. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a monitoring device for the temperature of the water-cooled wall of a power station boiler on the fire side. The heat collecting block is detachably installed on the outside of the water-cooling tube through a fixed structure, which is convenient for the disassembly and assembly of the heat collecting block and the replacement of the temperature sensing probe. The heat collecting block can be fixed in a suitable position according to actual conditions, which makes detection more convenient and has a good detection effect.

[0005] The utility model discloses a monitoring device for the temperature of the water-cooled wall of a power station boiler on the fire side, comprising a plurality of water-cooled tubes and fins; the water-cooled tubes and fins are installed at intervals; a heat collecting block is installed on the outer surface of the water-cooled tube; fixed frames are symmetrically arranged on the fins on both sides of each water-cooled tube, and a fixed structure is installed between the fixed frames on both sides of each water-cooled tube; the heat collecting block is detachably installed on the outer side of the water-cooled tube through the fixed structure;

[0006] A probe mounting hole is provided on one side of the heat collecting block close to the water cooling pipe; a temperature sensing probe is installed inside the probe mounting hole; a temperature measuring optical fiber for connecting with the temperature sensing probe is provided in the heat collecting block; the temperature sensing probe is communicatively connected with the processor via the temperature measuring optical fiber, and the pipe wall temperature detected by the temperature sensing probe is converted into an optical signal and transmitted to the processor via the temperature measuring optical fiber, thereby monitoring the temperature of the water cooling wall of the power station boiler on the fire side.

[0007] Furthermore, the heat collecting block is fitted on the outer surface of the water cooling pipe, and the heat collecting block has an arc-shaped structure on one side close to the water cooling pipe; the temperature sensing probe is fitted on the outer surface of the water cooling pipe.

[0008] Furthermore, a plurality of fixing sockets for connecting with a fixing structure are sequentially provided on a side of the heat collecting block away from the water cooling pipe along a height direction of the heat collecting block.

[0009] Furthermore, a magnetic plate is fixedly mounted on the inner wall of the fixing frame on a side close to the fins; and a mounting hole for connecting with a fixing structure is provided on a side of the fixing frame away from the fins.

[0010] Furthermore, the fixing structure includes a U-shaped clamping frame; a fixing rod is arranged in the center of the U-shaped clamping frame; the fixing rod is inserted in the fixing socket; a handle is installed on the side of the U-shaped clamping frame away from the fixing rod; movable plates are symmetrically arranged on both sides of the U-shaped clamping frame; a movable rod is connected to the side of the movable plate away from the U-shaped clamping frame; a fixing spring is sleeved on the outer side of the movable rod; a limit block is detachably installed on the end of the movable rod away from the movable plate; the limit block is magnetically attracted to the magnetic plate.

[0011] Furthermore, a connecting threaded rod is provided at the center of one side of the limit block close to the movable rod; the limit block is threadedly connected to the end of the movable rod through the connecting threaded rod.

[0012] Furthermore, one end of the fixing spring is in contact with the fixing frame, and the other end of the fixing spring is in contact with the limiting block.

[0013] Compared with the prior art, the utility model of the monitoring device for the fire side temperature of the water-cooled wall of a power station boiler can detachably install the heat collecting block on the outside of the water-cooling tube through a fixed structure, so that the installation and disassembly operations of the heat collecting block are relatively simple; when the temperature sensing probe is damaged, it is convenient to remove the heat collecting block and replace the temperature sensing probe, which improves the efficiency of replacing the temperature sensing probe, and can fix the heat collecting block in a suitable position according to actual conditions, thereby improving the practicality of the monitoring device, making detection more convenient and having a good detection effect; in addition, through the magnetic connection between the magnetic plate and the limit block, the fixation of the movable rod is more secure, so that the fixed plug rod can be stably inserted into the interior of the fixed plug hole, and the connection threaded rod makes the installation and disassembly of the limit block relatively simple, so that when the elasticity of the fixed spring is reduced or damaged, it is convenient to replace the fixed spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model.

[0015] Figure 2 It is a side structural schematic diagram of Example 1 of the utility model.

[0016] Figure 3 It is a partial cross-sectional structural schematic diagram of Example 1 of the utility model.

[0017] Figure 4 This is a schematic diagram of the installation structure of the temperature sensing probe of Example 1 of the utility model in the heat collecting block.

[0018] Figure 5 This is a schematic diagram of the fixed frame structure of Example 1 of the utility model.

[0019] Figure 6 It is a schematic diagram of the fixing structure and the fixing frame installation structure of Example 1 of the utility model.

[0020] Figure 7 This is a schematic diagram of the explosion structure of the fixed structure of Example 1 of the utility model.

[0021] The components in the accompanying drawings are marked as: 1-water cooling pipe, 2-fin, 3-heat collecting block, 4-fixed socket, 5-fixed frame, 6-magnetic plate, 7-fixed structure, 701-movable rod, 702-connecting threaded rod, 703-limiting block, 704-fixed spring, 705-movable plate, 706-U-shaped clamping frame, 707-fixed plug, 708-handle, 8-temperature sensing probe, 9-temperature measuring optical fiber, 10-probe mounting hole, 11-mounting hole. DETAILED DESCRIPTION

[0022] Embodiment 1:

[0023] like Figures 1 to 4 The monitoring device for the temperature of the water-cooled wall of a power station boiler on the fire side shown in the figure comprises a plurality of water-cooled tubes 1 and fins 2; the water-cooled tubes 1 and the fins 2 are installed at intervals; a heat collecting block 3 is installed on the outer surface of the water-cooled tube 1; a fixing frame 5 is symmetrically arranged on the fins 2 on both sides of each water-cooled tube 1, and a fixing structure 7 is installed between the fixing frames 5 on both sides of each water-cooled tube 1; the heat collecting block 3 is detachably installed on the outer side of the water-cooled tube 1 through the fixing structure 7;

[0024] The heat collecting block 3 is provided with a probe mounting hole 10 on the side close to the water cooling pipe 1; a temperature sensing probe 8 is installed inside the probe mounting hole; a temperature measuring optical fiber 9 for connecting to the temperature sensing probe 8 is provided in the heat collecting block 3; the temperature sensing probe 8 is communicatively connected with a processor (not shown) via the temperature measuring optical fiber 9, and the pipe wall temperature detected by the temperature sensing probe 8 is converted into an optical signal and transmitted to the processor via the temperature measuring optical fiber 9, thereby monitoring the temperature of the water-cooled wall of the power station boiler on the fire side.

[0025] The heat collecting block 3 is arranged on the outer surface of the water cooling pipe 1, and the heat collecting block 3 is in an arc-shaped structure on the side close to the water cooling pipe 1. The arc-shaped side of the heat collecting block 3 is in contact with the outer surface of the water cooling pipe 1, so that the heat collecting block 3 and the water cooling pipe 1 are more closely attached; the temperature sensing probe 8 is in contact with the outer surface of the water cooling pipe 1. The heat collecting block 3 is away from the water cooling pipe 1, and a plurality of fixing sockets 4 for connecting with the fixing structure are sequentially opened along the height direction of the heat collecting block 3.

[0026] like Figure 5 As shown, a magnetic plate 6 is fixedly mounted on the inner wall of the fixing frame 5 close to the fin 2 ; and a mounting hole 11 for connecting with a fixing structure is provided on the side of the fixing frame 5 away from the fin 2 .

[0027] like Figure 6 and Figure 7As shown, the fixing structure 7 includes a U-shaped clamping frame 706; a fixing rod 707 is arranged in the center of the U-shaped clamping frame 706; the fixing rod 707 is inserted into the fixing hole 4, and the fixing rod 707 is adapted to the size of the fixing hole 4, so that the fixing rod 707 can be smoothly connected to the fixing hole 4; a handle 708 is installed on the side of the U-shaped clamping frame 706 away from the fixing rod 707; movable plates 705 are symmetrically arranged on both sides of the U-shaped clamping frame 706; the movable plates 705 are symmetrically arranged on both sides of the U-shaped clamping frame 706; the movable plates 705 are symmetrically arranged on the ... A movable rod 701 is connected to the side of the movable plate 705 facing away from the U-shaped clamping frame 706; a fixed spring 704 is sleeved on the outer side of the movable rod 701; a limit block 703 is detachably installed on the end of the movable rod 701 facing away from the movable plate 705; the limit block 703 is magnetically attracted to the magnetic plate 6, and the material of the limit block 703 is iron. The position of the limit block 703 corresponds to that of the magnetic plate 6, and the size of the limit block 703 is matched with that of the magnetic plate 6, so that the limit block 703 can be more stably connected to the magnetic plate 6. A connecting threaded rod 702 is arranged at the center of the side of the limit block 703 close to the movable rod 701; the limit block 703 is threadedly connected to the end of the movable rod 701 through the connecting threaded rod 702. When the elasticity of the fixed spring 704 decreases, the limit block 703 is rotated to separate it from the movable rod 701. At this time, the fixed spring 704 can be removed and replaced with a new fixed spring 704, and then the connecting threaded rod 702 is reconnected to the movable rod 701, so as to complete the operation of replacing the fixed spring 704. One end of the fixed spring 704 contacts the fixed frame 5, and the other end of the fixed spring 704 fits with the limit block 703, so that the fixed spring 704 can produce elastic deformation with the movement of the limit block 703; and the fixed frame 5 can be stably limited to avoid the deviation of the fixed frame 5.

[0028] During installation, first place the heat collecting block 3 on the outer surface of the water-cooling pipe 1, and then connect the fixing structure 7 to the fixing frame 5 and the heat collecting block 3 respectively, so that the heat collecting block 3 can be stably installed on the outside of the water-cooling pipe 1; specifically, first hold the handle 708 of the fixing structure 7, and align the movable rod 701 with the mounting hole on the fixing frame 5, and at the same time, put the fixing spring 704 into the fixing frame 5, so that the movable rod 701 can pass through the fixing spring 704 while being inserted into the mounting hole; then, compress the fixing spring 704, and thread the limit block 703 on the end of the movable rod 701 by connecting the threaded rod 702; then, the limit block 703 is attracted to the magnetic plate 6; then, the fixing plug rod 707 is inserted into the fixing socket 4 to fix the heat collecting block 3.

[0029] The utility model provides a monitoring device for the temperature of the water-cooled wall of a power station boiler on the fire side. By coordinating the water-cooling pipe, the heat collecting block, the fixed jack, the fixed frame, the magnetic plate, the fixed structure, the temperature sensing probe and the temperature measuring optical fiber, the connection between the heat collecting block and the water-cooling pipe is no longer a fixed connection, and the installation and disassembly operations of the heat collecting block are relatively simple. When the temperature sensing probe is damaged, it is convenient to remove the heat collecting block and replace the temperature sensing probe, which improves the efficiency of replacing the temperature sensing probe, and the heat collecting block can be fixed in a suitable position according to actual conditions, thereby improving the practicality of the monitoring device.

[0030] In addition, the magnetic connection between the magnetic plate and the limit block makes the fixation of the movable rod more secure, so that the fixed plug rod can be stably inserted into the interior of the fixed socket, and the connecting threaded rod makes the installation and removal of the limit block easier, so that it is convenient to replace the fixed spring when the elasticity of the fixed spring is reduced or damaged.

[0031] The above embodiments are only preferred implementations of the present utility model, so all equivalent changes or modifications made according to the structures, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A monitoring device for the temperature of a water-cooled wall of a power station boiler on the fire side, comprising a plurality of water-cooled tubes and fins; the water-cooled tubes and fins are installed at intervals; a heat collecting block is installed on the outer surface of the water-cooled tube; Features: The fins on both sides of each water-cooling tube are symmetrically provided with fixing frames, and a fixing structure is respectively installed between the fixing frames on both sides of each water-cooling tube; the heat collecting block is detachably installed on the outside of the water-cooling tube through the fixing structure; A probe mounting hole is provided on one side of the heat collecting block close to the water cooling pipe; a temperature sensing probe is installed inside the probe mounting hole; a temperature measuring optical fiber for connecting to the temperature sensing probe is provided in the heat collecting block; the temperature sensing probe is communicatively connected to the processor via the temperature measuring optical fiber.

2. The monitoring device for the temperature of the water-cooled wall of a power station boiler facing the fire side according to claim 1, Features: The heat collecting block is arranged on the outer surface of the water cooling pipe, and the heat collecting block is in an arc-shaped structure on the side close to the water cooling pipe; the temperature sensing probe is in contact with the outer surface of the water cooling pipe.

3. The monitoring device for the temperature of the water-cooled wall of a power station boiler facing the fire side according to claim 1, Features: A plurality of fixing sockets for connecting with a fixing structure are sequentially provided along the height direction of the heat collecting block on the side of the heat collecting block away from the water cooling pipe.

4. The monitoring device for the temperature of the water-cooled wall of a power station boiler facing the fire side according to claim 1, Features: A magnetic plate is fixedly mounted on the inner wall of the fixing frame on the side close to the fins; and a mounting hole for connecting with the fixing structure is provided on the side of the fixing frame away from the fins.

5. The monitoring device for the temperature of the water-cooled wall of a power station boiler facing the fire side according to claim 1, Features: The fixing structure includes a U-shaped clamping frame; a fixing rod is arranged in the center of the U-shaped clamping frame; the fixing rod is inserted into the fixing hole; a handle is installed on the side of the U-shaped clamping frame away from the fixing rod; movable plates are symmetrically arranged on both sides of the U-shaped clamping frame; a movable rod is connected to the side of the movable plate away from the U-shaped clamping frame; a fixing spring is sleeved on the outer side of the movable rod; a limiting block is detachably installed on the end of the movable rod away from the movable plate; the limiting block is magnetically attracted to the magnetic plate.

6. The monitoring device for the temperature of the water-cooled wall of a power station boiler facing the fire side according to claim 5, Features: A connecting threaded rod is arranged at the center of one side of the limit block close to the movable rod; the limit block is threadedly connected to the end of the movable rod through the connecting threaded rod.

7. The device for monitoring the temperature of the water-cooled wall of a power station boiler facing the fire side according to claim 5, Features: One end of the fixing spring is in contact with the fixing frame, and the other end of the fixing spring is in contact with the limiting block.

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