Accurate temperature measuring device of fluidized bed boiler

Abstract

The utility model discloses an accurate temperature measuring device of a fluidized bed boiler, which belongs to the technical field of temperature measurement of fluidized bed boilers and comprises a bell-type hood for temperature measurement, the top of the bell-type hood is connected with a wear-resistant sleeve, and a top temperature sensing area of an armored thermocouple wire is arranged in the wear-resistant sleeve; the bell jar type air cap for measuring temperature is arranged on an air hole at a temperature measuring point in the boiling bed plate; the bottom end of the armored thermocouple wire penetrates through a through-wall pipe in the water-cooled wall and then is connected with a wear-resistant thermocouple junction box; and the armored thermocouple wire is fixed at the bottom of the wear-resistant sleeve through a first fixing clamping sleeve and is fixed with the through-wall pipe through a second fixing clamping sleeve. The top end temperature sensing area is arranged in the wear-resistant sleeve, and the wear-resistant sleeve is arranged at the top of the bell type hood for temperature measurement, so that high-pressure air at the air outlet is not interfered, and the top end temperature sensing area can be protected; the two ends of the sheathed thermocouple wire penetrating through the water-cooling air chamber are fixed through the first fixing clamping sleeve and the second fixing clamping sleeve, so that the sheathed thermocouple wire is prevented from vibrating and abrading an air pipe, a through-wall pipe and the like, and the service life of the sheathed thermocouple wire is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fluidized bed boiler temperature measurement technical field, concretely relates to a kind of accurate temperature measuring device of fluidized bed boiler. BACKGROUND

[0002] The statements in this part are only to provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] Fluidized bed boiler combustion is a new type of efficient, low-pollution clean coal combustion technology. During the operation of the fluidized bed boiler, the temperature of the fluidized bed boiler needs to be monitored so that timely adjustments can be made based on the temperature monitoring to ensure the safe operation of the boiler.

[0004] In the prior art, due to the large wear and tear inside the fluidized bed boiler and the difficulty of wiring, etc., the bed temperature measuring points inside the fluidized bed boiler are arranged by inserting from the side wall of the boiler. The monitoring positions are distributed relatively scattered, the wear-resistant sleeve of the temperature element on the boiling bed side cannot be deeply inserted, and the temperature monitoring on the boiling bed side can only monitor the wall temperature. The bed temperature inside the furnace and the center bed temperature cannot be measured (the center area is generally about 2.0m*7.0m), and the real combustion temperature cannot be reflected. Due to the fact that the temperature of the peripheral measuring points cannot reflect the real combustion situation, the difference between the internal bed temperature and the peripheral temperature is also increasing, causing problems such as lack of accurate basis for boiler adjustment, large fluctuations in environmental protection parameters, etc.

[0005] To solve the above problems, patent CN219550507U discloses a boiler furnace temperature measuring assembly, which comprises a temperature sensor and a sheath. The temperature sensor is vertically arranged on the air distribution plate in the furnace, and the sheath is sleeved on the temperature sensor with openings at both ends.

[0006] The above-mentioned scheme places the temperature sensor between the air caps. Although the bottom of the temperature sensor is protected by the sheath, the high-pressure air blown out of the air outlet is disturbed by the sheath, and the top end of the temperature sensor is not protected at all. A large amount of high-pressure air will inevitably cause impact and wear to the temperature sensor, affecting temperature measurement. UTILITY MODEL CONTENTS

[0007] To solve the above problems, the utility model provides an accurate temperature measuring device for a fluidized bed boiler. The armored thermocouple wire is arranged in the wear-resistant sleeve, and the wear-resistant sleeve is arranged at the top of the temperature-measuring bell-shaped air cap. It will not interfere with the high-pressure air blown out of the air outlet, and it can also protect the top of the armored thermocouple wire. It also cooperates with the wear-resistant sleeve through the first fixed sleeve, cooperates with the wall-penetrating pipe through the second fixed sleeve, and fixes the two ends of the armored thermocouple wire that passes through the water-cooled air chamber to prevent vibration and wear of the air pipe, the temperature-measuring bell-shaped air cap and the wall-penetrating pipe.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0009] The application discloses a precise temperature measuring device for a fluidized bed boiler.

[0010] The temperature measuring bell-shaped air cap is installed on a wind hole at a temperature measuring point position of a fluidized bed plate.

[0011] The bottom of the wear-resistant sleeve is fixed with the armored thermocouple wire through a first fixing sleeve.

[0012] Preferably, the wear-resistant sleeve is hollow inside, and the bottom is open and the top is closed.

[0013] Preferably, a threaded mounting hole is formed in the center of the top of the temperature measuring bell-shaped air cap, and a first threaded section is arranged at the bottom of the wear-resistant sleeve.

[0014] Preferably, the length of the first threaded section needs to satisfy: greater than twice the wall thickness of the temperature measuring bell-shaped air cap, and greater than the sum of the thickness of the first fixing sleeve and the wall thickness of the temperature measuring bell-shaped air cap.

[0015] Preferably, when the top end temperature sensing area of the armored thermocouple wire abuts against the top of the wear-resistant sleeve, a first fixing sleeve is arranged on the armored thermocouple wire, and the first fixing sleeve is connected with the first threaded section.

[0016] Preferably, a second threaded section is arranged at one end of the water wall outside the water wall.

[0017] Preferably, the second fixing sleeve is connected with the second threaded section.

[0018] Preferably, the water wall pipe passes through the gap of the water wall, and the water wall pipe is perpendicular to the wind hole at the temperature measuring point.

[0019] Preferably, after the wear-resistant sleeve is threadedly connected with the temperature measuring bell-shaped air cap, the connection between the wear-resistant sleeve and the temperature measuring bell-shaped air cap is welded again.

[0020] Preferably, the length of the wear-resistant sleeve without the first threaded section is not less than 300 mm, and not more than 400 mm.

[0021] Compared with the prior art, the application has the advantages and positive effects that:

[0022] The armored thermocouple wire is arranged in the wear-resistant sleeve, the wear-resistant sleeve is arranged at the top of the clock-shape air cap for temperature measurement, the high-pressure air blown out from the air outlet is not interfered, and the top of the armored thermocouple wire can be protected; the two ends of the armored thermocouple wire passing through the water-cooling air chamber are fixed through cooperation of the first fixed clamping sleeve and the wear-resistant sleeve and cooperation of the second fixed clamping sleeve and the wall-penetrating pipe, so that the wear of the armored thermocouple wire, the air pipe, the clock-shape air cap for temperature measurement and the wall-penetrating pipe is prevented, and the service life is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of this utility model form a part of the utility model and serve to provide further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions serve to explain the utility model, and do not constitute an improper limitation on the utility model.

[0024] Figure 1 is a temperature measuring device arrangement schematic view of the utility model embodiment;

[0025] In the drawings:

[0026] 1, clock-shape air cap for temperature measurement; 101, threaded mounting hole; 2, wear-resistant sleeve; 3, boiling bed plate; 4, water-cooling air chamber; 5, water-cooling wall; 6, wall-penetrating pipe; 7, armored thermocouple wire; 8, first fixed clamping sleeve; 9, wear-resistant thermocouple junction box; 10, second fixed clamping sleeve. DETAILED DESCRIPTION

[0027] It should be pointed out that the following detailed description is all exemplary, and aims at providing further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used in this paper have the same meaning as that generally understood by the ordinary skilled in the art to which the utility model belongs.

[0028] The utility model will be described in detail below in combination with the drawings. The precise temperature measuring device of the fluidized bed boiler disclosed in this embodiment comprises a clock-shape air cap for temperature measurement 1, a threaded wear-resistant sleeve 2 is connected to the top of the clock-shape air cap for temperature measurement 1, a top temperature sensing area of an armored thermocouple wire 7 is arranged in the wear-resistant sleeve 2, and the wear-resistant sleeve 2 and the armored thermocouple wire 7 are fixed through a first fixed clamping sleeve 8 at the bottom. Figure 1

[0029] Specifically, a threaded mounting hole 101 is formed in the top center of the clock-shape air cap for temperature measurement 1, a first threaded section is arranged at the bottom of the wear-resistant sleeve 2, and the threaded mounting hole 101 is matched with the first threaded section; after the first threaded section is threadedly connected with the threaded mounting hole, that is, after the wear-resistant sleeve 2 is connected with the clock-shape air cap for temperature measurement 1, it is necessary to ensure that the wear-resistant sleeve 2 is perpendicular to the clock-shape air cap for temperature measurement 1.

[0030] ​It should be noted that the length of the first threaded segment needs to meet: both greater than twice the wall thickness of the temperature measuring bell-shaped air cap 1, so as to ensure the fixed connection of the wear-resistant sleeve 2 and the temperature measuring bell-shaped air cap 1; and also greater than the sum of the wall thickness of the temperature measuring bell-shaped air cap 1 and the thickness of the first fixed sleeve 8, so as to be able to reserve the connection length of the first fixed sleeve 8. In some embodiments, after the wear-resistant sleeve 2 is threadedly connected with the temperature measuring bell-shaped air cap 1, the connection between the wear-resistant sleeve 2 and the temperature measuring bell-shaped air cap 1 is welded again to strengthen the connection.

[0031] As shown in Figure 1 , the temperature measuring bell-shaped air cap 1 is installed on the boiling bed plate 3. It can be understood that a plurality of air holes are provided on the boiling bed plate 3, and the bottom of the air hole is connected with a metal air pipe; the temperature measuring bell-shaped air cap 1 is fixedly installed on the air hole at the temperature measuring point position; the upper side of the boiling bed plate 3 is a boiling bed, and the lower side is a water-cooled air chamber 4, and the side of the water-cooled air chamber 4 away from the boiling bed plate 3 is a water-cooled wall 5, and the water-cooled wall 5 is provided with a through-wall pipe 6. It can be understood that when the temperature measuring bell-shaped air cap 1 with the wear-resistant sleeve 2 is installed on the boiling bed plate 3, the wear-resistant sleeve 2 is located in the boiling bed.

[0032] As shown in Figure 1 , the wear-resistant sleeve 2 is hollow inside, the bottom is open, and the top is closed, and is used for installing the top temperature sensing area of the armored thermocouple wire 7. It should be noted that the length of the wear-resistant sleeve 2 needs to meet: when not including the first threaded segment, i.e. the part of the temperature measuring bell-shaped air cap 1, this part of the length should not be less than 300 mm, and at the same time should not exceed 400 mm, the purpose is to ensure the temperature measuring accuracy of the top temperature sensing area of the armored thermocouple wire 7, and at the same time prevent the wear-resistant sleeve 2 from being too long and separated from the temperature measuring bell-shaped air cap 1 due to other actions in the boiling bed; therefore, the length of the wear-resistant sleeve 2 is between the length of the first threaded segment plus 300 mm to 400 mm.

[0033] As shown in Figure 1 , after the top temperature sensing area of the armored thermocouple wire 7 is inserted into the wear-resistant sleeve 2, and the top temperature sensing area of the armored thermocouple wire 7 is pressed against the top of the wear-resistant sleeve, the first fixed sleeve 8 is installed on the armored thermocouple wire 7, so that the first fixed sleeve 8 is connected with the first threaded segment. It can be understood that the first fixed sleeve 8 is prior art, including a sleeve, a joint body and a nut. The armored thermocouple wire 7 is fixed on the wear-resistant sleeve 2 through the first fixed sleeve 8, and the wear-resistant sleeve 2 is fixedly installed on the boiling bed plate 3, so as to realize the fixation of one end of the armored thermocouple wire 7.

[0034] As shown in Figure 1As shown, the other end of the armored thermocouple wire 7 passes through the water cooling air chamber, and then connects the wear-resistant thermocouple junction box 9 through the wall pipe 6; it should be noted that the wall pipe 6 is provided with a second threaded section at one end outside the water cooling wall 5, which is used to set the second fixed sleeve 10. It can be understood that the second fixed sleeve 10 is also prior art, and the difference between the first fixed sleeve 8 and the second fixed sleeve 10 is that due to the difference in the outer diameter size of the wall pipe 6 and the wear-resistant sleeve 2, the first fixed sleeve 8 and the second fixed sleeve 10 are different in model, both of which are temperature-resistant sleeves, and the fixed sleeves used in this embodiment are all made of stainless steel 316. The armored thermocouple wire 7 is fixed on the wall pipe 6 through the second fixed sleeve 10, and the purpose is to straighten the armored thermocouple wire 7 between the first fixed sleeve 8 and the second fixed sleeve 10, prevent the armored thermocouple wire 7 from vibrating, and reduce the friction between the armored thermocouple wire 7 and the wall pipe 6, the air pipe and the air cap.

[0035] In this embodiment, the armored thermocouple wire 7 adopts prior art, mainly composed of a K-type thermocouple and an insulation protective layer, and a stainless steel armored material, which can withstand high temperature up to 2000℃. The air flows in the water cooling air chamber 4, and its temperature is about 200℃, and there is no other physical fluid medium such as water to flush the armored thermocouple wire 7, so the wear-resistant sleeve 2 does not need to be set in the water cooling air chamber 4.

[0036] In this embodiment, it also includes a non-temperature measuring bell-shaped air cap, which can be understood that the temperature measuring bell-shaped air cap 1 is fixedly arranged on the air hole at the temperature measuring point, and the non-temperature measuring bell-shaped air cap is fixedly arranged on the other air holes. The non-temperature measuring bell-shaped air cap and the temperature measuring bell-shaped air cap are both provided with air outlets at the bottom, for high-pressure air to pass through.

[0037] In this embodiment, the high-pressure air is blown into the boiling bed from the air outlets of the non-temperature measuring bell-shaped air cap and the temperature measuring bell-shaped air cap; the top end temperature sensing area of the armored thermocouple wire 7 is arranged at the top of the temperature measuring bell-shaped air cap 1 through the wear-resistant sleeve 2, which does not affect the high-pressure air of the air outlet, and the wear-resistant sleeve 2 can protect the top end temperature sensing area of the armored thermocouple wire 7.

[0038] In this embodiment, when determining the temperature measuring point, the gap of the water cooling wall, the height of the water cooling air chamber, the laying condition of the boiler bottom pipeline and the position of the air hole on the boiling bed plate need to be considered comprehensively, and the appropriate installation position is determined through analysis. It needs to be ensured that the wall pipe 6 passes through the gap of the water cooling wall, and the position of the wall pipe 6 and the point of the temperature measuring point are perpendicular, that is, the wall pipe 6 is perpendicular to the air hole of the temperature measuring point; the armored thermocouple wire 7 remains straight before the wear-resistant sleeve 2 and the wall pipe 6.

[0039] Installation process:

[0040] Firstly, according to the boiler drawing, the water cooling wall gap, the water cooling air chamber layer height, the boiler bottom pipeline laying condition and the position of the air hole on the boiling bed plate, the position of the temperature measuring point is determined; the air hole of the temperature measuring point is perpendicular to the wall pipe through the water cooling wall gap;

[0041] Then, according to the length of the wear-resistant sleeve 2, the height of the temperature measuring bell-shaped air cap 1, the layer height of the water cooling air chamber 4, the thickness of the water cooling wall 5, the distance between the water cooling wall 5 and the wear-resistant thermocouple junction box 9, the length of the armored thermocouple wire 7 is determined;

[0042] Then, according to the number of temperature measuring points, a certain number of temperature measuring bell-shaped air caps 1 are processed, and the wear-resistant sleeve 2 is installed and welded on the temperature measuring bell-shaped air cap 1;

[0043] Install the temperature measuring point wall pipe;

[0044] Install the temperature measuring bell-shaped air cap 1 of the temperature measuring point;

[0045] The top temperature sensing area of the armored thermocouple wire 7 passes through the wall pipe 6, reaches the temperature measuring bell-shaped air cap 1 through the water cooling air chamber 4, and the top temperature sensing area of the armored thermocouple wire 7 is worn to the top of the wear-resistant sleeve 2, and the armored thermocouple wire 7 is fixed with the wear-resistant sleeve 2 through the first fixed sleeve 8;

[0046] In the water cooling air chamber 4, the armored thermocouple wire 7 is straightened, and after the armored thermocouple wire 7 is straightened, the armored thermocouple wire 7 is locked outside the water cooling wall 5 by the second fixed sleeve 10; prevent the armored thermocouple wire 7 from touching the temperature measuring bell-shaped air cap 1, the air pipe and the metal edge of the wall pipe;

[0047] The end of the armored thermocouple wire 7 outside the water cooling wall 5 is connected to the wear-resistant thermocouple junction box 9, and the wear-resistant thermocouple junction box 9 collects temperature information.

[0048] It can be understood that the cable is laid to connect the wear-resistant thermocouple junction box 9 and the existing system, which is used to transmit the temperature signal to the system for collection and configuration display on the system.

[0049] Although the specific embodiments of the utility model have been described above with reference to the drawings, it is not a limitation on the protection scope of the utility model, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. A precise temperature measuring device for a fluidized bed boiler, characterized in that The temperature measuring bell-shaped air cap is provided with a wear-resistant sleeve at the top, and a top temperature sensing area of an armored thermocouple wire is arranged in the wear-resistant sleeve. The temperature measuring bell-shaped air cap is installed on the air hole at the temperature measuring point position of the boiling bed plate. The bottom end of the armored thermocouple wire is connected to a wear-resistant thermocouple junction box after passing through a wall pipe arranged in the water-cooled wall at the temperature measuring point position.

2. A precise temperature measuring device for a fluidized bed boiler as claimed in claim 1, characterized in that The bottom of the wear-resistant sleeve is fixed with the armored thermocouple wire through a first fixing sleeve.

3. A precise temperature measuring device for a fluidized bed boiler as claimed in claim 1, characterized in that The wall pipe is fixed with the armored thermocouple wire through a second fixing sleeve.

4. A precise temperature measuring device for a fluidized bed boiler according to claim 3, characterized in that The wear-resistant sleeve is hollow inside, with an open bottom and a closed top.

5. A precise temperature measuring device for a fluidized bed boiler as defined in claim 3, characterized in that A threaded mounting hole is arranged in the center of the top of the temperature measuring bell-shaped air cap, and a first threaded section is arranged at the bottom of the wear-resistant sleeve.

6. A precise temperature measuring device for a fluidized bed boiler as defined in claim 1, characterized in that The length of the first threaded section needs to be greater than twice the wall thickness of the temperature measuring bell-shaped air cap, and greater than the sum of the thickness of the first fixing sleeve and the wall thickness of the temperature measuring bell-shaped air cap.

7. A precise temperature measuring device for a fluidized bed boiler according to claim 6, characterized in that When the top temperature sensing area of the armored thermocouple wire is pressed against the top of the wear-resistant sleeve, a first fixing sleeve is installed on the armored thermocouple wire, and the first fixing sleeve is connected with the first threaded section.

8. A precise temperature measuring device for a fluidized bed boiler as defined in claim 1, characterized in that A second threaded section is arranged at one end of the water-cooled wall outside the wall pipe.

9. A precise temperature measuring device for a fluidized bed boiler as claimed in claim 1, characterized in that The second fixing sleeve is connected with the second threaded section.

10. A precise temperature measuring device for a fluidized bed boiler as claimed in claim 1, characterized in that The wall pipe passes through the gap of the water-cooled wall, and is perpendicular to the air hole at the temperature measuring point. After the wear-resistant sleeve is threadedly connected with the temperature measuring bell-shaped air cap, the connection between the wear-resistant sleeve and the temperature measuring bell-shaped air cap is welded again. The length of the wear-resistant sleeve without the first threaded section should be no less than 300 mm, and no more than 400 mm.

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