Boiler furnace thermocouple mounting device

Abstract

The utility model relates to a boiler furnace thermocouple mounting device, which belongs to the technical field of boilers and particularly comprises a constant pressure bin and a thermocouple, the bottom of the constant pressure bin is connected onto a thermocouple mounting sleeve through a flange, a top plate is mounted at the top of the constant pressure bin, a thermocouple connecting seat is mounted on the top plate, and a first pressure maintaining ball valve is mounted in the constant pressure bin. A valve rod of the pressure maintaining ball valve extends to the outside of the constant-pressure bin, a control rod is installed on the valve rod, the thermocouple is installed on the thermocouple connecting base, a probe of the thermocouple extends into the thermocouple installation sleeve through a valve hole of the first pressure maintaining ball valve, a pressure maintaining pipe is further installed on the constant-pressure bin and communicates with the constant-pressure bin, and the thermocouple is installed on the thermocouple installation sleeve. The rapid thermocouple replacement device has the advantages that the rapid thermocouple replacement device is simple in structure and reasonable in design, and the thermocouples can be rapidly replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of boiler furnace thermocouple installation devices, belong to boiler technical field. BACKGROUND

[0002] At present, furnace temperature is main control technical index in high temperature and high pressure circulating fluidized bed boiler, and the temperature of general boiler furnace is controlled at about 850-950 degrees Celsius due to normal working temperature of boiler, and alarm will be reported when furnace temperature is higher than 1000 degrees Celsius, and the car will be jumped when furnace temperature is higher than 1150 degrees Celsius, and the present high temperature and high pressure circulating fluidized bed boiler adopts six measuring points, and six takes four temperature high jump car. And due to that furnace is full of slag, coal ash and coal slime particles in the operation of boiler, the temperature sheath is seriously eroded, and the temperature sheath is often burned through in operation, thereby causing temperature damage and maximum temperature display.

[0003] The traditional method is to enter the furnace with a hammer to knock out the temperature sheath after stopping the boiler. But due to the time of temperature sheath erosion is not fixed, or in emergency, the thermocouple core needs to be replaced under the condition of opening the boiler. But due to the normal working pressure of the boiler is about 15KPa, once the thermocouple core is disassembled, the coal ash and slag in the furnace will be immediately flushed into the sheath, causing the replacement of the core to be unable to insert into the sheath, and the replacement fails. Therefore, there is an urgent need for a replacement installation device to ensure that the sheath is not blocked when replacing the thermocouple core. UTILITY MODEL CONTENT

[0004] To solve the technical problems existing in the prior art, the utility model provides a boiler furnace thermocouple installation device which is simple in structure, reasonable in design and capable of quickly replacing thermocouple.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a kind of boiler furnace thermocouple installation device, including constant pressure bin and thermocouple, the constant pressure bin bottom is connected on thermocouple installation sheath through flange, the top of constant pressure bin is equipped with top plate, the top plate is equipped with thermocouple connecting seat, first pressure-keeping ball valve is installed in constant pressure bin, the valve stem of pressure-keeping ball valve extends to the outside of constant pressure bin, and the valve stem is equipped with control rod, the thermocouple is installed on thermocouple connecting seat, and the probe of the thermocouple extends to the thermocouple installation sheath through the valve hole of first pressure-keeping ball valve, pressure-keeping pipe is also installed on constant pressure bin, the pressure-keeping pipe is communicated with constant pressure bin, second pressure-keeping ball valve is installed on pressure-keeping pipe, and quick pipe joint is installed on the end of pressure-keeping pipe.

[0006] Preferably, the constant pressure bin is a variable-diameter pipe structure, the first pressure-keeping ball valve is installed at the upper part of the constant pressure bin, and the flanges at both ends of the first pressure-keeping ball valve are fully welded to the inner wall of the constant pressure bin.

[0007] Preferably, the valve orifice of the first pressure-holding ball valve is larger than the probe diameter of the thermocouple, and the gap between the valve orifice and the probe is 2-3 mm.

[0008] Preferably, the pressure-holding pipe is installed at the lower part of the constant pressure chamber and is inclined.

[0009] Compared with the prior art, the present invention has the following technical effects: The present invention installs thermocouples in a constant pressure chamber, and installs a pressure-holding pipe and two pressure-holding ball valves on the constant pressure chamber. The pressure holding and depressurization of the constant pressure chamber are controlled by the two pressure-holding ball valves, and high-pressure gas is filled into the constant pressure chamber through the pressure-holding pipe for pressure holding. This enables rapid replacement of thermocouples and avoids gas ejection from the furnace due to the pressure in the boiler furnace being greater than atmospheric pressure, which would carry slag and coal ash and block the thermocouple sheath. This solves the problem of thermocouples that cannot be replaced under normal boiler production conditions. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0011] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0012] like Figure 1 As shown, a boiler furnace thermocouple installation device includes a constant pressure chamber 1 and a thermocouple 2. The bottom of the constant pressure chamber 1 is connected to the thermocouple installation sleeve via a flange. A top plate 3 is installed on the top of the constant pressure chamber 1, and a thermocouple connection seat 4 is installed on the top plate 3. A first pressure-holding ball valve 5 is installed inside the constant pressure chamber 1. The valve stem of the pressure-holding ball valve 5 extends to the outside of the constant pressure chamber 1, and a control rod 6 is installed on the valve stem. The thermocouple 2 is installed on the thermocouple connection seat 4, and the probe of the thermocouple 2 extends into the thermocouple installation sleeve through the valve hole of the first pressure-holding ball valve 5. A pressure-holding pipe 7 is also installed on the constant pressure chamber 1, and the pressure-holding pipe 7 is connected to the constant pressure chamber 1. A second pressure-holding ball valve 8 is installed on the pressure-holding pipe 7, and a quick-connect pipe joint 9 is installed at the end of the pressure-holding pipe 7.

[0013] The constant pressure chamber 1 is a variable diameter pipe structure. The first pressure-holding ball valve 5 is installed on the upper part of the constant pressure chamber 1, and the flanges at both ends of the first pressure-holding ball valve 5 are fully welded to the inner wall of the constant pressure chamber 1. In this way, the first pressure-holding ball valve 5 and the constant pressure chamber 1 can be reliably fixed and have a certain pressure resistance. The valve orifice of the first pressure-holding ball valve 5 is larger than the probe diameter of the thermocouple, and the gap between the valve orifice and the probe is 2-3mm, which facilitates the installation of the thermocouple. The pressure-holding pipe 7 is installed at the lower part of the constant pressure chamber and is inclined for easy operation.

[0014] In the specific use, when the thermocouple wire needs to be replaced, first connect 20KPa instrument air to the quick connector 9 of the pressure maintaining pipe 7, then open the air source, open the second pressure maintaining ball valve 8, and blow positive pressure into the furnace. Then disassemble the thermocouple, slowly pull out the probe, and close the first pressure maintaining ball valve 5 when the probe of the thermocouple 2 is pulled out of the first pressure maintaining ball valve 5; at this time, the second pressure maintaining ball valve 8 can be closed or closed. Then insert the new thermocouple 2 into the first pressure maintaining ball valve 5, first open the second pressure maintaining ball valve 8, blow positive pressure into the furnace, then slowly open the first pressure maintaining ball valve 5, and insert the probe of the new thermocouple 2 into the valve hole of the first pressure maintaining ball valve 5 completely, and fix the thermocouple 2. After the thermocouple 2 is fixed, first close the second pressure maintaining ball valve 8, and then cut off the positive pressure ventilation source.

[0015] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A boiler furnace thermocouple mounting device, characterised in that: The constant pressure chamber is connected to the thermocouple mounting sleeve by flange at the bottom, the top of the constant pressure chamber is mounted with a top plate, the top plate is mounted with a thermocouple connecting seat, a first pressure maintaining ball valve is mounted in the constant pressure chamber, the valve rod of the pressure maintaining ball valve extends to the outside of the constant pressure chamber, a control rod is mounted on the valve rod, the thermocouple is mounted on the thermocouple connecting seat, the probe of the thermocouple extends to the thermocouple mounting sleeve through the valve hole of the first pressure maintaining ball valve, a pressure maintaining pipe is further mounted on the constant pressure chamber, the pressure maintaining pipe is communicated with the constant pressure chamber, a second pressure maintaining ball valve is mounted on the pressure maintaining pipe, and a quick pipe joint is mounted on the end of the pressure maintaining pipe.

2. A boiler furnace thermocouple mounting arrangement according to claim 1, characterised in that: The constant pressure chamber is a variable diameter pipe structure, the first pressure maintaining ball valve is mounted on the upper part of the constant pressure chamber, and the flanges at both ends of the first pressure maintaining ball valve are fully welded to the inner wall of the constant pressure chamber.

3. A boiler furnace thermocouple mounting device according to claim 1, characterised in that: The valve hole of the first pressure maintaining ball valve is larger than the diameter of the probe of the thermocouple, and the gap between the valve hole and the probe is 2-3mm.

4. A boiler furnace thermocouple mounting arrangement according to claim 2, characterised in that: The pressure maintaining pipe is mounted on the lower part of the constant pressure chamber and is arranged obliquely.

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