Heat flux test device

Abstract

The invention discloses a heat flux density test device, comprising a base, a first connector, a protection tube, a second connector, a sleeve, a thermocouple, a stopper and an elastic element; the base is fixed on a water-cooled wall; the first connector is fixed on the base; one end of the protection tube passes through the first connector and the base and one end of the protection tube is fixed to the first connector; the second connector is fixed to the other end of the protection tube; the sleeve is axially opposite to the other end of the protection tube and is threadedly connected with the second connector; the thermocouple passes through the sleeve, the second connector and the protection tube; the stopper is fixed on the outer peripheral surface of the thermocouple and is located in the sleeve; the elastic element is located in the sleeve and is arranged between the stopper and the end of the sleeve, so that the probe of the thermocouple is always pressed against the water-cooled wall. The thermocouple of the invention has accurate positioning, precise measurement, convenient maintenance and low maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of thermal engineering detection, and in particular to a heat flux density testing device. Background Art

[0002] The water-cooled wall of the boiler is composed of water-cooled wall fins and water-cooled wall fin tubes. The heat flux density test device is used to perform heat flux density test on the water-cooled wall of the boiler. The heat flux density test device is used to perform numerical simulation on the target water-cooled wall of the boiler to obtain the functional relationship between the temperature difference between the far end of the back-fire side of the water-cooled wall and the fin tube and the heat flux density of the water-cooled wall. During the on-site test, temperature measuring points are added to the far end of the back-fire side of the water-cooled wall fins and the water-cooled wall fin tubes to accurately obtain the temperatures at the two positions. The heat flux density of the water-cooled wall at the measuring point is calculated using the functional relationship obtained by numerical simulation.

[0003] In the existing heat flux density test, the thermocouple is usually welded directly to the water-cooled wall, or a simple base, thermocouple and connecting parts are set up, wherein the base is welded to the water-cooled wall fins, the thermocouple is fixed in the connecting part with the central opening, and the connecting part and the base are fixed with a self-locking nut to prevent falling off due to boiler vibration.

[0004] The existing heat flux density test device has the following main problems: First, during actual installation, since the furnace wall structure includes water-cooled wall, insulation layer, air layer and external protective steel plate from inside to outside, the thickness of the insulation layer is 30-40cm, the thickness of the air layer is 20-40cm, and the external protective steel plate is fully covered and cannot be removed separately. Therefore, the thermocouple or base, thermocouple and self-locking nut and other components are all buried in the foam layer. If the thermocouple needs to be maintained later, the external protective steel plate and insulation layer must be removed, which is time-consuming and labor-intensive, and the degree of damage to the furnace wall is large. The maintenance cost is high, and it cannot be replaced under the premise of boiler operation, and the furnace can only be stopped for replacement. Second, the on-site situation is relatively complicated, and there are size differences and welds. It is difficult to adjust the size of the base and connecting parts, and even if it is completed, it is difficult to achieve the corresponding accuracy requirements. Third, because the boiler vibrates during operation, the temperature of the boiler heating surface varies from room temperature to 500°C. The fluctuation within a large temperature difference will cause strong thermal expansion and contraction. The above vibration and thermal expansion will cause the thermocouple probe to be loose or not pressed tightly against the water-cooled wall. The clamping force of the thermocouple is uncertain, resulting in inaccurate measurement results, and the thermocouple probe is easily damaged and has a short life.

[0005] Due to the above problems of the existing heat flux density test device, its application scenarios are greatly limited. Modern power station intelligence urgently needs advanced power station boiler slagging monitoring, namely water-cooled wall heat flux density test technology, which can meet the requirements of low measurement cost, high prediction accuracy, and easy installation and maintenance. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a heat flux density testing device with accurate thermocouple positioning, precise measurement, convenient maintenance and low maintenance cost.

[0007] A heat flux testing device according to an embodiment of the present invention comprises:

[0008] A base, wherein the base is fixed on the water-cooled wall;

[0009] a first connecting member, wherein the first connecting member is fixed on the base;

[0010] A protection tube, one end of which passes through the first connecting member and the base and one end of which is fixed to the first connecting member;

[0011] A second connecting piece, the second connecting piece being fixed to the other end of the protection tube;

[0012] A sleeve, the sleeve being axially opposite to the other end of the protection tube and being threadedly connected to the second connecting piece;

[0013] a thermocouple, the thermocouple passing through the sleeve, the second connecting piece and the protective tube;

[0014] A stopper, the stopper is fixed on the outer peripheral surface of the thermocouple and is located inside the sleeve;

[0015] An elastic element is located in the sleeve and is arranged between the stopper and the end of the sleeve, so that the probe of the thermocouple is always pressed against the water-cooled wall.

[0016] The heat flux density testing device according to the embodiment of the present invention has the following advantages: first, the thermocouple can be accurately positioned by the first connecting member and the protective tube, so that the probe of the thermocouple is aligned with the part to be measured on the water-cooled wall, thereby improving the accuracy of the measurement; second, the thermocouple is always pressed against the part to be measured on the water-cooled wall by the elastic element, thereby further improving the accuracy of the measurement; third, the sleeve can be disassembled by screwing the sleeve, the thermocouple can be pulled out, and a new thermocouple can be replaced without destroying the furnace wall structure. Even when the boiler is operating normally, the thermocouple can be replaced. Therefore, the thermocouple is easy to maintain, which greatly reduces the maintenance cost and maintenance time; fourth, the length of the elastic element in the axial direction, that is, the distance between the limiter and the end of the sleeve, can be adjusted by screwing the sleeve, thereby adjusting the preload force of the spring; fifth, since the thermocouple is arranged in the protective tube, the service life of the thermocouple is long.

[0017] According to an embodiment of the present invention, the thermocouple and the protection tube are in interference fit.

[0018] According to an embodiment of the present invention, a slide groove for the protection tube to pass through is provided on the base, and the first connecting member can be guided and slid on the base along the extension direction of the slide groove before being fixed to the base.

[0019] According to a further embodiment of the present invention, the first connecting member includes an upper plate, a lower plate and a side plate, the upper plate and the lower plate are fixed to the upper end and the lower end of the side plate, the upper plate, the lower plate and the side plate form a U-shaped structure, the upper plate cooperates with the upper end surface of the base, the lower plate cooperates with the lower end surface of the base, the side plate is located on the outer side surface of the base, and the side plate is provided with a through hole for the protective tube to pass through.

[0020] According to a further embodiment of the present invention, an internal thread is provided on the inner wall of the through hole, and an external thread is provided on the outer peripheral surface of one end of the protective tube. The one end of the protective tube cooperates with the internal thread on the inner wall of the through hole through the external thread, so that the one end of the protective tube is fixed to the first connecting member.

[0021] According to yet a further embodiment of the present invention, the first connecting member is fixed to the base by screws.

[0022] According to yet a further embodiment of the present invention, the first connecting member is further fixed to the base by welding.

[0023] According to an embodiment of the present invention, the limiting member is a nut, and the nut is threadedly fitted and fixed to the outer peripheral surface of the thermocouple.

[0024] According to an embodiment of the present invention, the elastic element is a spring or a reed, and the spring or the reed is sleeved on the outer circumference of the thermocouple.

[0025] According to an embodiment of the present invention, the second connecting member is fixed to the protection tube by threaded connection.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 Schematic diagram of a cross-section of a heat flux testing device according to an embodiment of the present invention.

[0029] Figure 2 It is a three-dimensional schematic diagram of a heat flux testing device according to an embodiment of the present invention.

[0030] Figure 3 Schematic diagram of application scenario of the heat flux testing device according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] Heat flux test device 1000

[0033] Water-cooled wall 1 Water-cooled wall fin 101 Water-cooled wall fin tube 102

[0034] Base 2 Slide 201

[0035] First connecting member 3 Upper plate 301 Lower plate 302 Side plate 303

[0036] Protection tube 4 Second connecting piece 5 Sleeve 6 Thermocouple 7 Limiting piece 8 Elastic element 9 Screw 10 DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] Combine the following Figure 1 to Figure 2 The heat flux testing device 1000 according to an embodiment of the present invention is described.

[0039] like Figure 1 and Figure 2 As shown, a heat flux testing device 1000 according to an embodiment of the present invention is used to perform a heat flux test on a water-cooled wall 1 , wherein the water-cooled wall 1 is composed of a water-cooled wall fin 101 and a water-cooled wall fin tube 102 .

[0040] The heat flux density testing device 1000 of the embodiment of the present invention includes a base 2, a first connecting piece 3, a protective tube 4, a second connecting piece 5, a sleeve 6, a thermocouple 7, a limiter 8 and an elastic element 9; wherein, the base 2 is fixed on the water-cooled wall 1; the first connecting piece 3 is fixed on the base 2; one end of the protective tube 4 passes through the first connecting piece 3 and the base 2 and one end of the protective tube 4 is fixed to the first connecting piece 3; the second connecting piece 5 is fixed to the other end of the protective tube 4; the sleeve 6 is axially opposite to the other end of the protective tube 4 and is threadedly connected to the second connecting piece 5; the thermocouple 7 passes through the sleeve 6, the second connecting piece 5 and the protective tube 4; the limiter 8 is fixed on the outer peripheral surface of the thermocouple 7 and is located in the sleeve 6; the elastic element 9 is located in the sleeve 6 and is arranged between the limiter 8 and the end of the sleeve 6, so that the probe of the thermocouple 7 is always pressed tightly against the water-cooled wall 1.

[0041] Specifically, the base 2 is fixed on the water-cooled wall 1; it can be understood that the base 2 mainly supports the protection tube 4 and the thermocouple 7; the base 2 can be a roughly rigid U-shaped frame plate, and the open end of the U-shaped frame plate can be fixed on the water-cooled wall fin 101, or on the water-cooled wall fin tube 102; the base 2 can be fixed on the water-cooled wall 1 by welding, which is more secure and not easy to loosen or fall off.

[0042] The first connecting piece 3 is fixed on the base 2; one end of the protection tube 4 passes through the first connecting piece 3 and the base 2 and one end of the protection tube 4 is fixed to the first connecting piece 3; it can be understood that the first connecting piece 3 is mainly used to facilitate the fixing of the protection tube 4. Since the temperature distribution of the water-cooled wall 1 is relatively complex when the boiler is running, the protection tube 4 and the thermocouple 7 in the protection tube 4 can be accurately positioned by arranging the first connecting piece 3 on the base, so that the probe of the thermocouple 7 is aimed at the part to be measured on the water-cooled wall 1, avoiding the probe of the thermocouple 7 deviating from the part to be measured on the water-cooled wall 1 and causing inaccurate temperature measurement; and the protection tube 4 is mainly used to protect the thermocouple 7.

[0043] The second connecting member 5 is fixed to the other end of the protective tube 4; the sleeve 6 is axially opposite to the other end of the protective tube 4 and is threadedly connected to the second connecting member 5; it can be understood that the second connecting member 5 is mainly used to connect the sleeve 6; the sleeve 6 and the second connecting member 5 are fixed by threaded cooperation, and the installation and disassembly operations of the sleeve 6 are convenient.

[0044] The thermocouple 7 passes through the sleeve 6, the second connector 5 and the protective tube 4; the stopper 8 is fixed on the outer circumference of the thermocouple 7 and is located in the sleeve 6; the elastic element 9 is located in the sleeve 6 and is arranged between the stopper 8 and the end of the sleeve 6, so that the probe of the thermocouple 7 is always pressed against the water-cooled wall 1. It can be understood that, please refer to Figure 3, since the furnace wall of the boiler includes a water-cooled wall 1, an insulation layer, an air layer and an external protective steel plate from the inside to the outside, wherein the thickness of the insulation layer is 30 to 40 cm, the thickness of the air layer is 20 to 40 cm, and the external protective steel plate is usually fully covered and cannot be removed separately, the protection tube 4 and the thermocouple 7 need to pass through the insulation layer, the air layer and the external protective steel plate, and the thermocouple 7 is arranged in the protection tube 4. The protection of the protection tube 4 can extend the service life of the thermocouple 7; by arranging the limiter 8, the elastic element 9 and the sleeve 6, the probe of the thermocouple 7 is always pressed against the part to be measured on the water-cooled wall 1, avoiding the water-cooled wall 1 caused by the high temperature operation of the boiler (above 300°C) The vibration may cause the probe to fail to press against the water-cooled wall 1 or deviate from the measured part of the water-cooled wall 1, resulting in inaccurate temperature measurement. When the probe of the thermocouple 7 is always pressed against the measured part of the water-cooled wall 1, the thermocouple 7 can accurately measure the temperature of the measured part of the water-cooled wall 1, and the measurement accuracy is high. When the thermocouple 7 needs to be maintained, there is no need to destroy the furnace wall structure, and the sleeve 6 exposed outside the external protective steel plate can be removed by screwing it, and the thermocouple 7 can be pulled out and replaced with a new one. Even when the boiler is running at high temperature, the thermocouple 7 can be replaced. Therefore, the thermocouple 7 is easy to install and disassemble, and the thermocouple 7 is easy to maintain with low maintenance cost.

[0045] The heat flux test device 1000 according to the embodiment of the present invention has the following advantages: first, the thermocouple 7 can be accurately positioned by the first connecting member 3 and the protective tube 4, so that the probe of the thermocouple 7 is aligned with the part to be measured of the water-cooled wall 1, thereby improving the accuracy of the measurement; second, the thermocouple 7 is always pressed against the part to be measured of the water-cooled wall 1 by the elastic element 9, thereby further improving the accuracy of the measurement; third, the sleeve 6 can be disassembled by screwing the sleeve 6, the thermocouple 7 can be pulled out, and a new thermocouple 7 can be replaced without destroying the furnace wall structure, and the thermocouple 7 can be replaced even when the boiler is operating normally, thereby making the thermocouple 7 easy to maintain, greatly reducing the maintenance cost and maintenance time; fourth, the length of the elastic element 9 in the axial direction, that is, the distance between the limiter and the end of the sleeve 6, can be adjusted by screwing the sleeve 6, thereby adjusting the preload force of the spring; fifth, since the thermocouple 7 is arranged in the protective tube 4, the service life of the thermocouple 7 is long.

[0046] According to one embodiment of the present invention, there is an interference fit between the thermocouple 7 and the protection tube 4. It can be understood that, on the one hand, the thermocouple 7 is more accurately installed and positioned; on the other hand, due to the high temperature operation of the boiler, the water-cooled wall 1 vibrates, which also causes the base 2 and the protection tube 4 to vibrate. Therefore, by interfering the thermocouple 7 with the protection tube 4, the displacement of the thermocouple 7 can be avoided, and the measurement accuracy of the thermocouple 7 is guaranteed.

[0047] According to one embodiment of the present invention, the base 2 is provided with a slide groove 201 for the protection tube 4 to pass through, and the first connecting member 3 can be guided to slide on the base 2 along the extension direction of the slide groove 201 before being fixed to the base 2. It can be understood that since the first connecting member 3 can be guided to slide on the base 2 along the extension direction of the slide groove 201 before being fixed to the base 2, the installation and positioning of the protection tube 4 can be facilitated. For example, the protection tube 4 can be first passed through the first connecting member 3 and the slide groove 201, the protection tube 4 can be fixed on the first connecting member 3, and then the first connecting member 3 can be moved to a suitable position, and then the first connecting member 3 can be fixed to the base 2, so that the positioning and installation are accurate.

[0048] According to a further embodiment of the present invention, the first connecting member 3 includes an upper plate 301, a lower plate 302 and a side plate 303, the upper plate 301 and the lower plate 302 are fixed to the upper end and the lower end of the side plate 303, the upper plate 301, the lower plate 302 and the side plate 303 form a U-shaped structure, the upper plate 301 cooperates with the upper end surface of the base 2, the lower plate 302 cooperates with the lower end surface of the base 2, the side plate 303 is located on the outer side surface of the base 2, and the side plate 303 is provided with a through hole for the protection tube 4 to pass through. In this way, the installation of the protection tube 4 can be facilitated and the positioning is reliable.

[0049] According to a further embodiment of the present invention, an internal thread is provided on the inner wall of the perforation, and an external thread is provided on the outer peripheral surface of one end of the protection tube 4, and the one end of the protection tube 4 cooperates with the internal thread on the inner wall of the perforation through the external thread, so that the one end of the protection tube 4 is fixed to the first connecting member 3. Therefore, the protection tube 4 and the first connecting member 3 are easy to install and firmly fixed, which can meet the requirements of normal use.

[0050] According to a further embodiment of the present invention, the first connecting member 3 is fixed to the base 2 by screws 10. For example, the upper plate 301 and the upper end surface of the base 2 can be fixed by screws 10, the lower plate 302 and the lower end surface of the base 2 can be fixed by screws 10, and the side plate 303 and the outer side surface of the base 2 can be fixed by screws 10.

[0051] According to a further embodiment of the present invention, the first connecting member 3 is also fixed to the base 2 by welding. Thereby, the connection between the first connecting member 3 and the base 2 can be further strengthened to prevent the first connecting member 3 from loosening during use when the boiler is running. According to one embodiment of the present invention, the limiter 8 is a nut, and the nut is fixed to the outer peripheral surface of the thermocouple 7 by threaded cooperation. It can be understood that by placing the nut on the limiter 8, on the one hand, the nut is directly screwed on the outer peripheral surface of the thermocouple 7 by threaded cooperation, which can limit the elastic element 9, so that the elastic element 9 squeezes the limiter 8, thereby pressing the probe of the thermocouple 7 tightly against the part to be measured on the water-cooled wall 1; on the other hand, by screwing the nut, the axial position of the nut on the thermocouple 7 is adjusted, so that the length of the elastic element 9 in the axial direction can be adjusted.

[0052] According to one embodiment of the present invention, the elastic element 9 is a spring or a reed, and the spring or the reed is sleeved on the outer periphery of the thermocouple 7. It can be understood that the spring or the reed can press the thermocouple 7 against the part to be measured on the water-cooled wall 1. The spring or the reed is sleeved on the outer periphery of the thermocouple 7 and will not fall off.

[0053] According to an embodiment of the present invention, the second connecting member 5 and the protective tube 4 are fixed by threaded connection, which is convenient and reliable.

[0054] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat flux testing device, characterized in that: include: A base, wherein the base is fixed on the water-cooled wall; a first connecting member, wherein the first connecting member is fixed on the base; A protection tube, one end of which passes through the first connecting member and the base and one end of which is fixed to the first connecting member; A second connecting piece, the second connecting piece being fixed to the other end of the protection tube; A sleeve, the sleeve being axially opposite to the other end of the protection tube and being threadedly connected to the second connecting piece; a thermocouple, the thermocouple passing through the sleeve, the second connecting piece and the protective tube; A stopper, the stopper is fixed on the outer peripheral surface of the thermocouple and is located inside the sleeve; An elastic element, the elastic element is located in the sleeve and is arranged between the stopper and the end of the sleeve, so that the probe of the thermocouple is always pressed against the water-cooled wall; The thermocouple and the protection tube are in interference fit; The base is provided with a slide groove for the protection tube to pass through, and the first connecting member can be guided and slid on the base along the extension direction of the slide groove before being fixed to the base; The first connecting member includes an upper plate, a lower plate and a side plate, wherein the upper plate and the lower plate are fixed to the upper end and the lower end of the side plate, and the upper plate, the lower plate and the side plate form a U-shaped structure, the upper plate cooperates with the upper end surface of the base, the lower plate cooperates with the lower end surface of the base, the side plate is located on the outer side surface of the base, and the side plate is provided with a through hole for the protective tube to pass through.

2. The heat flux testing device according to claim 1, characterized in that: An internal thread is provided on the inner wall of the through hole, and an external thread is provided on the outer circumferential surface of one end of the protection tube. The one end of the protection tube cooperates with the internal thread on the inner wall of the through hole through the external thread, so that the one end of the protection tube is fixed to the first connecting member.

3. The heat flux testing device according to claim 2, characterized in that: The first connecting member is fixed to the base by screws.

4. The heat flux testing device according to claim 3, characterized in that: The first connecting member is also fixed on the base by welding.

5. The heat flux testing device according to claim 1, characterized in that: The limiting member is a nut, and the nut is threadedly matched and fixed to the outer peripheral surface of the thermocouple.

6. The heat flux testing device according to claim 1, characterized in that: The elastic element is a spring or a reed, and the spring or the reed is sleeved on the outer circumference of the thermocouple.

7. The heat flux testing device according to claim 1, characterized in that: The second connecting member is fixed to the protection tube by threaded connection.

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