A main steam sampling device on the side of a furnace

Abstract

The application discloses a kind of main steam sampling device of furnace side in the technical field of boiler sampling tube, including sampling tube outer layer and sampling tube inner layer, the upper end of sampling tube inner layer is rotatably installed with upper connecting pipe;Sampling tube outer layer is sleeved in sampling tube inner layer and the outside of upper connecting pipe, and annular cavity is formed between the two;Upper baffle is arranged between the upper end of sampling tube inner layer and sampling tube outer layer, and annular cavity is divided into collection cavity and insulation cavity arranged above and below by upper baffle;Insulation layer is filled in insulation cavity, and guide pipe is arranged on one side of collection cavity;Arc guide part is arranged in the inside of upper connecting pipe, and a plurality of overflow holes are formed in the sidewall of upper connecting pipe corresponding to the bottom of arc guide part, and reflux condensate can flow into the inside of collection cavity along arc guide part through overflow hole, the application reduces the cold and hot alternation inside and outside sampling tube, eliminates the interference of reflux condensate to pipe body, and increases the service life of pipe body.

Description

Technical Field

[0001] This invention relates to the field of boiler sampling tube technology, specifically to a main steam sampling device for the furnace side. Background Technology

[0002] This design is prone to causing steam condensation and backflow, resulting in frequent hot and cold alternation at the pipe opening. After long-term operation, thermal fatigue cracks may occur at the pipe opening. This design poses a significant safety hazard. If a leak occurs during unit operation, it may lead to unscheduled unit shutdown or even personal injury.

[0003] Most existing sampling tubes improve the lifespan of the equipment by changing the material and welding seams, but they do not address the fundamental problem that alternating hot and cold temperatures can cause cracks in the sampling tubes, thus limiting their ability to improve their service life. Summary of the Invention

[0004] The technical problem of the present invention is to provide a main steam sampling device on the furnace side to reduce the alternation of hot and cold inside and outside the sampling tube, eliminate the interference of reflux condensate on the tube body, and increase the service life of the tube body.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a main steam sampling device for the furnace side, comprising an outer sampling tube and an inner sampling tube, wherein an upper connecting pipe is rotatably installed at the upper end of the inner sampling tube; the outer sampling tube is sleeved on the outer side of the inner sampling tube and the upper connecting pipe, and an annular cavity is formed between the two; an upper partition is provided between the upper end of the inner sampling tube and the outer sampling tube, the upper partition dividing the annular cavity into a collection cavity and an isolation cavity arranged vertically; the isolation cavity is filled with a heat insulation layer, and a guide pipe is provided on one side of the collection cavity; an arc-shaped guide is provided inside the upper connecting pipe, and multiple sets of overflow holes are opened on the side wall of the upper connecting pipe corresponding to the bottom of the arc-shaped guide, so that the reflux condensate can flow into the collection cavity through the overflow holes along the arc-shaped guide.

[0006] As a further embodiment of the present invention, the arc-shaped guide includes a lower guide section and an upper guide section; both the lower guide section and the upper guide section are funnel-shaped; the lower guide section has its wide opening facing downwards, and its lower end is fixedly connected to the inner wall of the upper connecting pipe; the upper guide section has its wide opening facing upwards, and its lower end is fixedly connected to the upper end of the lower guide section.

[0007] As a further embodiment of the present invention, the inner layer of the sampling tube is provided with a lower connecting end at the lower end and an upper connecting end at the upper end; the lower connecting end is embedded in the bottom of the outer layer of the sampling tube; the upper connecting end is threadedly connected to the lower end of the upper connecting tube; an embedded ring is fixedly provided at the upper end of the upper connecting tube, and the embedded ring is embedded in the inner part of the upper end of the outer layer of the sampling tube.

[0008] As a further aspect of the present invention, the outer and inner layers of the sampling tube are made of the same material as the boiler shell, and the dissimilar steel welding process is completed in the manufacturing plant.

[0009] As a further embodiment of the present invention, a one-way valve is fixedly installed on the guide tube, and the one-way valve only allows the liquid in the collection chamber to be discharged outward through the guide tube.

[0010] As a further embodiment of the present invention, the end of the embedded ring is made of elastic rubber material, and the embedded ring can rotate inside the outer layer of the sampling tube.

[0011] As a further embodiment of the present invention, the upper partition is disposed above the bending position of the inner layer of the sampling tube; the upper and lower surfaces of the upper partition are provided with waterproof layers; the material of the upper partition is the same as the material of the outer layer and the inner layer of the sampling tube.

[0012] As a further embodiment of the present invention, the lower connecting end is fastened to the outer layer of the sampling tube by multiple sets of bolts; the filling insulation layer is formed by filling the isolation cavity with insulation particles; and an elastic protective layer is provided between the insulation particles and the inner layer of the sampling tube.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the sampling tube consists of an outer sampling tube and an inner sampling tube. A heat insulation layer is filled between the inner and outer layers of the sampling tube. The heat insulation layer isolates the temperature difference between the inside and outside of the sampling tube to a certain extent, reducing the possibility of cracks in the pipe caused by the temperature difference between the high temperature of the internal flue gas and the low temperature of the external environment, thereby increasing the service life of the pipe.

[0014] 2. In this invention, the upper end of the inner layer of the sampling tube is replaced by the upper connecting tube. The refluxed condensate is intercepted by the arc-shaped guide in the upper connecting tube, which restricts the condensate from continuing to flow downward, thereby cooling the inner layer of the sampling tube. Instead, the condensate is trapped and enters the collection chamber, and is discharged through the guide tube. The fatigue cracks caused by the reflux of condensate will be concentrated on the upper connecting tube. The upper connecting tube itself is threadedly connected to the inner layer of the sampling tube, which makes it easier to repair and replace, and the maintenance cost is also lower. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a cross-sectional view of the structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the upper middle part.

[0017] The attached diagram lists the components represented by each number as follows: 1. Sampling tube outer layer; 2. Guide tube; 3. Sampling tube inner layer; 301. Upper connecting end; 302. Lower connecting end; 4. Insulation layer; 5. Upper partition; 6. Upper connecting tube; 601. Lower guide section; 602. Upper guide section; 603. Overflow hole; 604. Embedded ring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-3 This invention provides a technical solution: a main steam sampling device for the furnace side, comprising an outer sampling tube 1 and an inner sampling tube 3, wherein an upper connecting tube 6 is rotatably installed at the upper end of the inner sampling tube 3; the outer sampling tube 1 is sleeved on the outer side of the inner sampling tube 3 and the upper connecting tube 6, and an annular cavity is formed between the two; an upper partition 5 is provided between the upper end of the inner sampling tube 3 and the outer sampling tube 1, and the upper partition 5 divides the annular cavity into a collection cavity and an isolation cavity arranged vertically; the isolation cavity is filled with a heat insulation layer 4, and a guide tube 2 is provided on one side of the collection cavity; an arc-shaped guide is provided inside the upper connecting tube 6, and multiple sets of overflow holes 603 are opened on the side wall of the upper connecting tube 6 corresponding to the bottom of the arc-shaped guide, so that the reflux condensate can flow into the collection cavity through the overflow holes 603 along the arc-shaped guide.

[0020] In operation, the sampling tube of this invention consists of an outer sampling tube and an inner sampling tube 3. A heat insulation layer 4 is filled between the inner and outer layers of the sampling tube. The heat insulation layer 4 isolates the temperature difference between the inside and outside of the sampling tube to a certain extent, reducing the possibility of cracks caused by the temperature difference between the high temperature of the internal flue gas and the low temperature of the external environment, thereby increasing the service life of the tube. In addition, the upper end of the inner layer 3 of the sampling tube is replaced by the upper connecting end 301 tube. The condensate flowing back is intercepted by the arc-shaped guide of the upper connecting tube 6, which restricts the condensate from flowing further down, thereby cooling the inner layer 3 of the sampling tube and trapping the condensate into the collection chamber. The condensate is then discharged through the guide tube 2. The fatigue cracks caused by the condensate backflow will be concentrated on the upper connecting tube 6. The upper connecting tube 6 itself is threadedly connected to the inner layer 3 of the sampling tube, which makes it easier to repair and replace, and the maintenance cost is also lower.

[0021] As a further embodiment of the present invention, the arc-shaped guide includes a lower guide section 601 and an upper guide section 602; both the lower guide section 601 and the upper guide section 602 are funnel-shaped; the lower guide section 601 has its wide opening facing downwards, and its lower end is fixedly connected to the inner wall of the upper connecting pipe 6; the upper guide section 602 has its wide opening facing upwards, and its lower end is fixedly connected to the upper end of the lower guide section 601.

[0022] During operation, the condensate in this invention flows back along the pipe wall. The refluxed condensate falls through the gap between the upper guide section 602 and the upper connecting pipe 6, and finally enters the collection chamber through the overflow hole 603. Then it is discharged through the guide pipe 2. The lower guide section 601 and the upper guide section 602 are wide at both ends and narrow in the middle, so that the flue gas can be directly discharged from the sampling pipe as it rises along the pipe body, instead of escaping into the collection chamber.

[0023] As a further embodiment of the present invention, the inner layer 3 of the sampling tube is provided with a lower connecting end 302 at the lower end and an upper connecting end 301 at the upper end; the lower connecting end 302 is embedded in the bottom of the outer layer 1 of the sampling tube; the upper connecting end 301 is threadedly connected to the lower end of the upper connecting tube 6; an embedded ring 604 is fixedly provided at the upper end of the upper connecting tube 6, and the embedded ring 604 is embedded in the upper end of the outer layer 1 of the sampling tube.

[0024] During operation, the lower end of the inner layer 3 of the sampling tube is fixedly connected to the outer layer 1 of the sampling tube via the lower connecting end 302. The lower connecting end 302 increases the sealing of the connection between the inner and outer layers. In addition to increasing the sealing, the embedded ring 604 is rotatably connected to the outer layer 1 of the sampling tube and is made of rubber, which facilitates the disassembly and assembly of the upper connecting tube 6 and the inner layer 3 of the sampling tube.

[0025] As a further embodiment of the present invention, the outer layer 1 and the inner layer 3 of the sampling tube are made of the same material as the boiler shell, and the dissimilar steel welding process is completed in the manufacturing plant.

[0026] During operation, this invention increases the strength of the sampling tube and extends the service life of the sampling process by using the same material and welding process.

[0027] As a further embodiment of the present invention, a one-way valve is fixedly installed on the guide tube 2, and the one-way valve only allows the liquid in the collection chamber to be discharged outward through the guide tube 2.

[0028] During operation, the one-way valve in this invention can prevent external air and water vapor from flowing back into the sampling channel, thus avoiding water vapor contamination. As a further embodiment of the present invention, the end of the embedded ring 604 is made of elastic rubber material, and the embedded ring 604 can rotate inside the outer layer 1 of the sampling tube.

[0029] During operation, the overflow hole and guide pipe can be rotated and adjusted during on-site installation to adapt to the narrow installation space on the furnace side. The rubber end seals the annular cavity to prevent heat loss and water leakage.

[0030] As a further embodiment of the present invention, the upper partition 5 is located above the bending position of the inner layer 3 of the sampling tube; both the upper and lower surfaces of the upper partition 5 are provided with waterproof layers; the material of the upper partition 5 is the same as that of the outer layer 1 and the inner layer 3 of the sampling tube.

[0031] During operation, the insulation cavity of this invention is filled with particulate heat insulation material, and an elastic protective layer is added to the inner tube wall to buffer thermal expansion and reduce heat conduction.

[0032] As a further embodiment of the present invention, the lower connecting end 302 is fastened to the outer layer 1 of the sampling tube by multiple sets of bolts; the heat insulation layer 4 is formed by filling the isolation cavity with heat insulation particles; and an elastic protective layer is provided between the heat insulation particles and the inner layer 3 of the sampling tube.

[0033] During operation, an elastic layer is provided between the heat insulation layer 4 and the inner layer 3 of the sampling tube in this invention. This allows the device to better adapt to the deformation of the inner layer 3 of the sampling tube, and facilitates the replacement of the inner layer 3 of the sampling tube when it is damaged.

Claims

1. A main steam sampling device for the furnace side, comprising an outer layer (1) of a sampling tube and an inner layer (3) of a sampling tube, characterized in that: The upper end of the inner layer (3) of the sampling tube is rotatably installed with an upper connecting tube (6); the outer layer (1) of the sampling tube is sleeved on the outer side of the inner layer (3) and the upper connecting tube (6), and an annular cavity is formed between the two; an upper partition (5) is provided between the upper end of the inner layer (3) and the outer layer (1) of the sampling tube, and the upper partition (5) divides the annular cavity into a collection cavity and an isolation cavity arranged vertically; the isolation cavity is filled with a heat insulation layer (4), and a guide tube (2) is provided on one side of the collection cavity; an arc-shaped guide is provided inside the upper connecting tube (6), and multiple overflow holes (603) are opened on the side wall of the upper connecting tube (6) corresponding to the bottom of the arc-shaped guide, so that the reflux condensate can flow into the collection cavity through the overflow holes (603) along the arc-shaped guide.

2. The main steam sampling device for the furnace side according to claim 1, characterized in that: The arc-shaped guide includes a lower guide section (601) and an upper guide section (602); both the lower guide section (601) and the upper guide section (602) are funnel-shaped; the lower guide section (601) has its wide opening facing downwards, and its lower end is fixedly connected to the inner wall of the upper connecting pipe (6); the upper guide section (602) has its wide opening facing upwards, and its lower end is fixedly connected to the upper end of the lower guide section (601).

3. The main steam sampling device for the furnace side according to claim 2, characterized in that: The inner layer (3) of the sampling tube has a lower connecting end (302) at the lower end and an upper connecting end (301) at the upper end; the lower connecting end (302) is embedded in the bottom of the outer layer (1) of the sampling tube; the upper connecting end (301) is threadedly connected to the lower end of the upper connecting tube (6); the upper end of the upper connecting tube (6) is fixedly provided with an embedded ring (604), which is embedded in the upper part of the outer layer (1) of the sampling tube.

4. The main steam sampling device for the furnace side according to claim 3, characterized in that: The outer layer (1) and inner layer (3) of the sampling tube are made of the same material as the boiler shell, and the dissimilar steel welding process is completed in the manufacturing plant.

5. The main steam sampling device for the furnace side according to claim 4, characterized in that: A one-way valve is fixedly installed on the guide tube (2), and the one-way valve only allows the liquid in the collection chamber to be discharged outward through the guide tube (2).

6. The main steam sampling device for the furnace side according to claim 3, characterized in that: The end of the embedded ring (604) is made of elastic rubber, and the embedded ring (604) can rotate inside the outer layer (1) of the sampling tube.

7. The main steam sampling device for the furnace side according to claim 1, characterized in that: The upper partition (5) is located above the bending position of the inner layer (3) of the sampling tube; the upper and lower surfaces of the upper partition (5) are provided with waterproof layers; the material of the upper partition (5) is the same as that of the outer layer (1) and the inner layer (3) of the sampling tube.

8. The main steam sampling device for the furnace side according to claim 5, characterized in that: The lower connecting end (302) is fastened to the outer layer (1) of the sampling tube by multiple sets of bolts; the filling insulation layer (4) is formed by filling the isolation cavity with insulation particles; an elastic protective layer is provided between the insulation particles and the inner layer (3) of the sampling tube.

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