A water-cooled wall heat flow monitoring device

Abstract

The utility model relates to power station boiler water cooling wall heat flow monitoring technical field, concretely is a kind of water cooling wall heat flow monitoring device, including pipe support, temperature measuring element, lower shell plate and U-shaped shell plate, the pipe support upper end is equipped with multiple clamping slots, clamping slot is equipped with pipe inside, the tail end of lower shell plate is equipped with supporting plate, the top of U-shaped shell plate is equipped with upper convex plate, pipe support is detachably connected on upper convex plate, lower shell plate is detachably connected at the bottom of U-shaped shell plate, and accommodate space is formed between lower shell plate and U-shaped shell plate, the accommodate space is filled with heat preservation material, U-shaped shell plate is connected with outer cold wall, the head of U-shaped shell plate is equipped with elastic pressure mechanism, temperature measuring element passes through multiple pipes and is extruded and adheres on water cooling wall by heat preservation material.The utility model structure is simple, need not to punch groove on water cooling wall, will not damage water cooling wall strength structure, and also improve the accuracy of measurement, and installation maintenance are also convenient.

Description

Technical Field

[0001] This utility model relates to the field of heat flow monitoring technology for water-cooled walls of power plant boilers, specifically a water-cooled wall heat flow monitoring device. Background Technology

[0002] With the increasing parameters of thermal power generating units, the materials of the furnace heating tubes are approaching their temperature resistance limits, making accurate control of the furnace tube wall temperature crucial for safe operation. Existing heat flux meters for measuring heat flux density generally use water-cooling systems to maintain stable cold-end temperatures. While water-cooled heat flux meters offer advantages such as high accuracy and stability, their complex cooling systems result in bulky equipment, significantly increasing boiler structural complexity and posing a risk of overheating and damage to the heat flux meter due to cooling system malfunctions. This poses safety hazards and incurs high maintenance costs, making large-scale deployment in supercritical units difficult. Another type is the back-fire side differential temperature flow meter, which calculates heat flux density based on the temperature difference between the hot and cold ends of the thermocouples. However, due to various interference factors such as working fluid temperature, tube wall material properties, and ash accumulation, the same temperature difference may correspond to multiple heat flux values, making measurement accuracy difficult to guarantee. Calculation corrections are required, and drilling grooves in the water-cooled wall is necessary, affecting the strength of the water-cooled wall tubes and potentially leading to water-cooled wall cracking accidents during rapid boiler load changes. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a water-cooled wall heat flow monitoring device to solve the problems mentioned in the background art.

[0004] The technical solution of this utility model is:

[0005] A water-cooled wall heat flux monitoring device includes a tube-through bracket, a temperature sensing element, a lower shell plate, and a U-shaped outer shell plate. The upper end of the tube-through bracket is provided with multiple slots, in which tubes are installed. The tail end of the lower shell plate is provided with a support plate. The top end of the U-shaped outer shell plate is provided with an upper convex plate. The tube-through bracket is detachably connected to the upper convex plate. The lower shell plate is detachably connected to the bottom of the U-shaped outer shell plate. A receiving space is formed between the lower shell plate and the U-shaped outer shell plate, and the receiving space is filled with thermal insulation material. The U-shaped outer shell plate is connected to an outer cold wall. The head end of the U-shaped outer shell plate is provided with an elastic pressing mechanism for limiting the thermal insulation material. The temperature sensing element passes through multiple tubes and is pressed and adhered to the water-cooled wall by the thermal insulation material.

[0006] Preferably, the tube support is provided with at least two first mounting holes, a first bolt is provided in the first mounting hole, a first nut is provided on the first bolt, and the upper convex plate is provided with at least two second mounting holes for the first bolt to pass through.

[0007] Preferably, the insulation material is aluminum silicate.

[0008] Preferably, the contact surface between the insulation material and the water-cooled wall is provided with an insertion hole for inserting a temperature measuring element, and the depth of the insertion hole is 100~150mm.

[0009] Preferably, the temperature sensing element is a sheathed thermocouple.

[0010] Preferably, the elastic pressing mechanism includes four pressing components arranged in a rectangle on the U-shaped outer shell plate. Each pressing component includes a pressing plate and a second bolt. The head end of the second bolt has a telescopic groove. A slider is slidably disposed in the telescopic groove. The front part of the slider has an abutting rod. The head end of the telescopic groove has a limiting ring. An elastic element is disposed between the slider and the groove wall of the telescopic groove. The U-shaped outer shell plate has four first screw holes arranged in a rectangle and cooperating with the second bolt. The pressing plate is disposed in the receiving space. The pressing plate abuts against the insulation material. The abutting rod abuts against the back of the pressing plate.

[0011] Preferably, the elastic element is a spring.

[0012] Preferably, the support plate has a through hole, a third bolt is provided in the through hole, and the lower end of the U-shaped outer shell plate has a second screw hole that mates with the third bolt.

[0013] Preferably, the head end of the U-shaped outer shell plate is welded to the outer cold wall, and the head end of the support plate is fitted and abutted against the outer cold wall.

[0014] Preferably, the bottom of the U-shaped outer shell plate is provided with two symmetrically arranged bending plates, and a slot is formed between the bending plates and the U-shaped outer shell plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention has a simple structure, eliminates the need for drilling holes or slots in the water-cooled wall, does not damage the structural strength of the water-cooled wall, improves measurement accuracy, and is easy to install and maintain. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the water-cooled wall heat flux monitoring device of this utility model;

[0018] Figure 2 This is a side view of the water-cooled wall heat flux monitoring device of this utility model;

[0019] Figure 3 This is a partial structural schematic diagram of the water-cooled wall heat flux monitoring device of this utility model;

[0020] Figure 4 This is a partial cross-sectional view of the elastic pressure-resistant mechanism of this utility model.

[0021] In the picture:

[0022] 1. Pipe support; 11. Slot; 12. Pipe; 13. First bolt; 14. First nut; 2. Lower shell plate; 21. Support plate; 22. Third bolt; 3. U-shaped outer shell plate; 31. Upper convex plate; 32. Second bolt hole; 33. Bending plate; 34. Slot; 4. Accommodation space; 5. Insulation material; 6. Elastic pressing mechanism; 61. Pressing plate; 62. Second bolt; 621. Telescopic groove; 622. Slider; 623. Abutment rod; 624. Limiting ring; 63. Spring. Detailed Implementation

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

[0024] Please see Figure 1-4 The present invention will describe the above technical solution in detail through the following embodiments:

[0025] A water-cooled wall heat flow monitoring device includes a tube support 1, a temperature sensing element, a lower shell plate 2, and a U-shaped outer shell plate 3. The upper end of the tube support 1 is provided with multiple slots 11, in which tubes 12 are installed. The tail end of the lower shell plate 2 is provided with a support plate 21. The top end of the U-shaped outer shell plate 3 is provided with an upper convex plate 31. The tube support 1 is detachably connected to the upper convex plate 31. The lower shell plate 2 is detachably connected to the bottom of the U-shaped outer shell plate 3. A receiving space 4 is formed between the lower shell plate 2 and the U-shaped outer shell plate 3. The receiving space 4 is filled with thermal insulation material 5. The U-shaped outer shell plate 3 is connected to the outer cold wall. The head end of the U-shaped outer shell plate 3 is provided with an elastic pressing mechanism 6 for limiting the thermal insulation material 5. The temperature sensing element passes through multiple tubes 12 and is pressed and adhered to the water-cooled wall by the thermal insulation material 5.

[0026] This invention uses insulation material 5 to insulate the temperature measuring element, reducing the error caused by the temperature difference between the temperature measuring element and the ambient temperature due to the lack of insulation. The elastic pressing mechanism 6 allows the insulation material 5 to adhere to the water-cooled wall, improving stability.

[0027] The tube 12 can also be fixed to the slot 11 by locking it with a nut or by welding.

[0028] The pipe support 1 is provided with at least two first mounting holes, a first bolt 13 is provided in the first mounting hole, a first nut 14 is provided on the first bolt 13, and the upper protrusion plate 31 is provided with at least two second mounting holes for the first bolt 13 to pass through.

[0029] The pipe support 1 can be quickly disassembled by the cooperation of the first bolt 13 and the first nut 14.

[0030] Insulation material 5 is aluminum silicate and aluminum carbonate, which are resistant to high temperatures, have good thermal insulation properties, and are also soft, lightweight, and elastic.

[0031] The surface of the insulation material 5 that contacts the water-cooled wall is provided with a socket for inserting a temperature measuring element, and the depth of the socket is 100~150mm.

[0032] The temperature sensing element is a sheathed thermocouple.

[0033] Armored thermocouples are used to directly measure or control the temperature of fluids, steam, and gaseous media, as well as solid surfaces, within the range of 0-1800℃ in various production processes. Armored thermocouples have many advantages, including flexibility, high pressure resistance, fast thermal response time, and durability.

[0034] The diameter of the armored thermocouple is slightly smaller than the diameter of the socket to facilitate insertion; however, the diameter of both should not exceed 1 mm.

[0035] The elastic pressing mechanism 6 includes four pressing components arranged in a rectangle on the U-shaped outer shell plate 3. Each pressing component includes a pressing plate 61 and a second bolt 62. The head end of the second bolt 62 is provided with a telescopic groove 621. A slider 622 is slidably arranged in the telescopic groove 621. An abutting rod 623 is provided at the front of the slider 622. A limiting ring 624 is provided at the head end of the telescopic groove 621. An elastic element is provided between the slider 622 and the groove wall of the telescopic groove 621. The U-shaped outer shell plate 3 is provided with four first screw holes arranged in a rectangle and cooperating with the second bolt 62. The pressing plate 61 is arranged in the receiving space 4. The pressing plate 61 abuts against the insulation material 5. The abutting rod 623 abuts against the back of the pressing plate 61.

[0036] Tightening the second bolt 62 allows the pressure plate 61 to fit tightly against the insulation material 5 within the accommodating area. However, due to the natural expansion of the water-cooled wall, the insulation material 5 may not fit tightly against the wall, leading to measurement errors. This can be prevented by the elastic element. The elastic force of the element drives the slider 622 outward, which in turn causes the abutment rod 623 to extend outward. The abutment rod 623 transmits force to the pressure plate 61, causing it to press firmly against the insulation material 5, thus ensuring a tight fit between the insulation material 5 and the water-cooled wall.

[0037] The elastic element is spring 63, which uses its elastic force to abut against the pressure plate 61.

[0038] The support plate 21 has a through hole, and a third bolt 22 is installed in the through hole. The lower end of the U-shaped outer shell plate 3 has a second screw hole 32 that mates with the third bolt 22, which improves the ease of installation of the support plate 21.

[0039] The head end of the U-shaped outer shell plate 3 is welded to the outer cold wall, and the head end of the support plate 21 is attached to the outer cold wall, which ensures that the water-cooled wall can expand naturally.

[0040] The bottom of the U-shaped outer shell plate 3 is provided with two symmetrically arranged bending plates 33. A slot 34 is formed between the bending plates 33 and the U-shaped outer shell plate 3. The bending plates 33 can limit the support plate 21 and prevent the support plate 21 from accidentally shifting.

Claims

1. A water-cooled wall heat flux monitoring device, characterized in that: The device includes a tube support (1), a temperature sensing element, a lower shell plate (2), and a U-shaped outer shell plate (3). The tube support (1) has multiple slots (11) at its upper end, in which tubes (12) are installed. The lower shell plate (2) has a support plate (21) at its tail end. The U-shaped outer shell plate (3) has an upper convex plate (31) at its top end. The tube support (1) is detachably connected to the upper convex plate (31), and the lower shell plate (2) is detachably connected to... At the bottom of the U-shaped outer shell plate (3), a receiving space (4) is formed between the lower shell plate (2) and the U-shaped outer shell plate (3). The receiving space (4) is filled with thermal insulation material (5). The U-shaped outer shell plate (3) is connected to the outer cold wall. The head end of the U-shaped outer shell plate (3) is provided with an elastic pressing mechanism (6) for limiting the thermal insulation material (5). The temperature measuring element passes through multiple through tubes (12) and is pressed and adhered to the water-cooled wall by the thermal insulation material (5).

2. The water-cooled wall heat flux monitoring device according to claim 1, characterized in that: The pipe support (1) is provided with at least two first mounting holes, a first bolt (13) is provided in the first mounting hole, a first nut (14) is provided on the first bolt (13), and the upper convex plate (31) is provided with at least two second mounting holes for the first bolt (13) to pass through.

3. The water-cooled wall heat flux monitoring device according to claim 1, characterized in that: The insulation material (5) is aluminum silicate.

4. The water-cooled wall heat flux monitoring device according to claim 1 or 3, characterized in that: The thermal insulation material (5) has a socket for inserting a temperature measuring element on the contact surface with the water-cooled wall. The depth of the socket is 100~150mm.

5. The water-cooled wall heat flux monitoring device according to claim 4, characterized in that: The temperature sensing element is a sheathed thermocouple.

6. The water-cooled wall heat flux monitoring device according to claim 1, characterized in that: The elastic pressing mechanism (6) includes four pressing components arranged in a rectangle on the U-shaped outer shell plate (3). The pressing components include a pressing plate (61) and a second bolt (62). The head end of the second bolt (62) is provided with a telescopic groove (621). A slider (622) is slidably provided in the telescopic groove (621). The front part of the slider (622) is provided with an abutting rod (623). The head end of the telescopic groove (621) is provided with a limiting ring (624). An elastic element is provided between the slider (622) and the groove wall of the telescopic groove (621). The U-shaped outer shell plate (3) is provided with four first screw holes arranged in a rectangle and cooperating with the second bolt (62). The pressing plate (61) is set in the accommodating space (4). The pressing plate (61) abuts against the thermal insulation material (5). The abutting rod (623) abuts against the back of the pressing plate (61).

7. The water-cooled wall heat flux monitoring device according to claim 6, characterized in that: The elastic element is a spring (63).

8. The water-cooled wall heat flux monitoring device according to claim 1, characterized in that: The support plate (21) has a through hole, and a third bolt (22) is provided in the through hole. The lower end of the U-shaped outer shell plate (3) is provided with a second screw hole (32) that cooperates with the third bolt (22).

9. The water-cooled wall heat flux monitoring device according to claim 1, characterized in that: The head end of the U-shaped outer shell plate (3) is welded to the outer cold wall, and the head end of the support plate (21) is attached to and abuts against the outer cold wall.

10. The water-cooled wall heat flux monitoring device according to claim 1, characterized in that: The bottom of the U-shaped outer shell plate (3) is provided with two symmetrically arranged bending plates (33), and a slot (34) is formed between the bending plates (33) and the U-shaped outer shell plate (3).

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