Anti-stretching hanger pipe mechanism for convection heating surface in tail flue

Abstract

The utility model discloses a kind of anti-expansion hanger pipe mechanisms of convection heating surface in tail flue, solve the problem that annular weld is prone to cracking when hot water pipeline between tail flue top package wall and economizer outlet header expansion;First vertical hot water delivery pipeline (6) is connected to the top of the first economizer intermediate header (10), after first vertical hot water delivery pipeline (6) is penetrated out of flue top package wall (2) upwards, with the one end of flue outer first connecting pipeline section (7) is communicated together, the other end of flue outer first connecting pipeline section (7) is communicated with economizer outlet header (8), left and right direction V-shaped bending (11) is provided on flue outer first connecting pipeline section;First angle steel connecting piece (5) and first hanger rod (4) are welded and connected on the pipe wall after first vertical hot water delivery pipeline is penetrated out of flue top package wall (2) upwards, and the upper end of first hanger rod (4) is fixedly connected on roof beam (3).

Description

Technical Field

[0001] This utility model relates to a sintering flue gas co-purification device, and particularly to a hanging pipe mechanism for the convection heating surface in the tail flue of the sintering flue gas co-purification device. Background Technology

[0002] In the tail flue of the existing sintering flue gas co-purification device, high and low temperature convective heating surfaces are installed. The intermediate temperature superheater, low temperature superheater, and high temperature economizer are suspended in the tail flue via lifting pipes. Specifically, an economizer outlet header is installed above the top wall of the tail flue, i.e., outside the top of the tail flue. The economizer outlet header is suspended from the top beam by a hanger. In the tail flue, a vertically upward hot water pipeline on the intermediate header of the economizer passes through the flue from bottom to top. After the top wall is sealed, the hot water supply pipe passes through the sealing fins between two adjacent wall-sealing pipes and exits to the outside of the flue, connecting with the economizer outlet header. The heated hot water in the economizer tube bank enters the economizer intermediate header and then flows vertically upwards through the hot water supply pipe to the economizer outlet header on the outside of the flue top. The hot water in the economizer outlet header then flows through the supply pipe into the boiler drum. To maintain the top seal of the flue and prevent flue gas leakage, the vertically upward hot water supply pipe passes through the top wall of the flue. The annular gaps formed behind the sealing fins of the wall are all sealed by welding. The welds connect the outer wall of the hot water supply pipeline to the sealing fins as a whole. During boiler operation, the flue gas heats the water in the economizer. The heated water enters the intermediate header of the economizer, rises, and is reheated by the flue gas. It then passes through the top wall of the tail flue and enters the economizer outlet header outside the flue. Therefore, the hot water supply pipeline experiences significant thermal expansion and contraction. Since the lower end of the hot water supply pipeline in the flue connects to the intermediate header of the economizer... Since the hot water pipeline is in a free-suspension state, the thermal expansion and contraction of the hot water pipeline inside the flue can be absorbed by the free-suspension end. However, the upper part of the hot water pipeline and the top wall of the tail flue are fixedly welded together. When thermal expansion or contraction occurs in the upper part of the hot water pipeline that extends to the outside of the top of the flue, the lack of a mechanism to absorb this amount often causes the weld at the top wall of the tail flue to crack. This not only damages the seal of the flue but also creates a safety hazard for boiler operation, becoming a prominent problem that needs to be solved on site. Summary of the Invention

[0003] This utility model provides an anti-expansion and contraction suspension pipe mechanism for the convective heating surface in the tail flue, which solves the technical problem that the circumferential weld is prone to cracking when the hot water pipeline between the top wall of the tail flue and the economizer outlet header expands and contracts.

[0004] This utility model solves the above technical problems through the following technical solution: An anti-expansion and contraction suspension mechanism for a convective heating surface in a tail flue includes a tail flue, a flue top wall at the top of the tail flue, an economizer outlet header above the flue top wall, and the economizer outlet header being suspended from a top beam by a vertical hanger rod; a first economizer intermediate header and a second economizer intermediate header are respectively installed in the tail flue, a high-temperature economizer tube bank is suspended between the first and second economizer intermediate headers, and a first vertical hot water delivery pipeline is connected to the top of the first economizer intermediate header. After the conveying pipeline extends upward through the top wall of the flue, it connects to one end of the first connecting pipeline section outside the flue. The other end of the first connecting pipeline section outside the flue connects to the economizer outlet header. A V-shaped bend in the left and right directions is provided on the first connecting pipeline section outside the flue. A first annular weld is provided where the first vertical hot water conveying pipeline extends through the top wall of the flue. A first angle steel connector is welded to the pipe wall after the first vertical hot water conveying pipeline extends upward through the top wall of the flue. A first hanger is connected to the upper end of the first angle steel connector. The upper end of the first hanger is fixedly connected to the top beam.

[0005] A second vertical hot water delivery pipeline is connected to the top of the intermediate header of the second economizer. After the second vertical hot water delivery pipeline passes through the top wall of the flue, it connects to one end of the second connecting pipeline section outside the flue. The other end of the second connecting pipeline section outside the flue connects to the economizer outlet header. A V-shaped bend in the vertical direction is provided on the second connecting pipeline section outside the flue. A second annular weld is provided where the second vertical hot water delivery pipeline passes through the top wall of the flue. A second angle steel connector is welded to the pipe wall after the second vertical hot water delivery pipeline passes through the top wall of the flue. A second hanger is connected to the upper end of the second angle steel connector. The upper end of the second hanger is fixedly connected to the top beam.

[0006] Between the first vertical hot water delivery pipeline and the second vertical hot water delivery pipeline, a low-temperature superheater tube bank and a medium-temperature superheater tube bank are respectively connected.

[0007] This invention overcomes the problem of thermal expansion of the economizer hot water delivery pipe section outside the top wall of the flue, avoids damage to the annular weld at the top wall of the vertical hot water delivery pipe, ensures the sealing safety of the tail flue, and also ensures the safe and stable operation of the hot water delivery pipe. Attached Figure Description

[0008] Figure 1 is a structural schematic diagram of this utility model in the front view direction; Figure 2 This is a schematic diagram of the structure of this utility model from a top view. Detailed Implementation

[0009] The present invention will now be described in detail with reference to the accompanying drawings: An anti-expansion and anti-tightening pipe suspension mechanism for convective heating surfaces in a tail flue includes a tail flue 1. A flue top wall 2 is installed at the top of the tail flue 1. An economizer outlet header 8 is installed above the flue top wall 2. The economizer outlet header 8 is suspended from a top beam 3 by a vertical hanger 9. The top beam 3 serves as the support point for the economizer outlet header 8 and each convective heating surface in the flue. A first economizer intermediate header 10 and a second economizer intermediate header 12 are respectively installed in the tail flue 1. A high-temperature economizer tube bank 18 is suspended between the first economizer intermediate header 10 and the second economizer intermediate header 12. The first economizer outlet header 10, the second economizer intermediate header 12, the third economizer outlet header, and the fourth economizer outlet header are evenly distributed and symmetrically arranged in the tail flue. A high-temperature economizer tube bank 18 is suspended between the four economizer intermediate headers. A first vertical hot water delivery pipe 6 is connected to the top of the first economizer intermediate header 10. The first vertical hot water delivery pipe 6 extends upwards through the top wall 2 of the flue and connects to one end of a first connecting pipe section 7 outside the flue. The other end of the first connecting pipe section 7 outside the flue connects to the economizer outlet header 8. The first vertical hot water delivery pipe 6 and the first connecting pipe section 7 outside the flue... As a single pipeline, a V-shaped bend 11 in the left and right directions is provided on the first connecting pipeline section 7 outside the flue. A first annular weld is provided at the point where the first vertical hot water conveying pipeline 6 exits the top wall 2 of the flue to ensure the sealing of the flue. After the water in the high-temperature economizer tube bank 18 is heated by the flue gas in the tail flue 1, it first collects in the first economizer intermediate header 10. Then, it goes up along the first vertical hot water conveying pipeline 6, exits the top wall 2 of the flue, passes through the first connecting pipeline section 7 outside the flue, and enters the economizer outlet header 8. The hot water in the economizer outlet header 8 is transported to the boiler drum and finally enters the boiler furnace to be heated into steam. Therefore... The hot water temperature in the first connecting pipe section 7 outside the flue is very high, which will cause a large amount of thermal expansion in the first connecting pipe section 7 outside the flue. This thermal expansion is effectively absorbed by the V-shaped bend 11 in the left and right directions, thus ensuring that the weld between the first connecting pipe section 7 outside the flue and the top wall 2 of the flue is not pulled and cracked. A first angle steel connector 5 is welded to the pipe wall after the first vertical hot water conveying pipe 6 passes through the top wall 2 of the flue. A first hanger 4 is connected to the upper end of the first angle steel connector 5. The upper end of the first hanger 4 is fixedly connected to the top beam 3. The weight of the entire first vertical hot water conveying pipe 6 is supported on the top beam 3.

[0010] A second vertical hot water delivery pipe 13 is connected to the top of the intermediate header 10 of the second economizer. After the second vertical hot water delivery pipe 13 passes through the top wall 2 of the flue, it is connected to one end of the second connecting pipe section 16 outside the flue. The other end of the second connecting pipe section 16 outside the flue is connected to the economizer outlet header 8. A vertical V-shaped bend 17 is provided on the second connecting pipe section 16 outside the flue. A second annular weld is provided where the second vertical hot water delivery pipe 13 passes through the top wall 2 of the flue. A second angle steel connector 14 is welded to the pipe wall after the second vertical hot water delivery pipe 13 passes through the top wall 2 of the flue. A second hanger 15 is connected to the upper end of the second angle steel connector 14. The upper end of the second hanger 15 is fixedly connected to the top beam 3. The vertical V-shaped bend 17 can be flexibly set according to the arrangement of each pipe.

[0011] Between the first vertical hot water delivery pipeline 6 and the second vertical hot water delivery pipeline 13, a low-temperature superheater tube bank 19 and a medium-temperature superheater tube bank 20 are respectively connected; the weight of the superheater tube bank is also supported by the vertical hot water delivery pipeline and is vertically transferred to the top beam 3.

Claims

1. A tension-resistant hanging pipe mechanism for a convective heating surface in a tail flue, comprising a tail flue (1), a flue top wall (2) provided at the top of the tail flue (1), an economizer outlet header (8) provided above the flue top wall (2), the economizer outlet header (8) being suspended on a top beam (3) by a vertical hanging rod (9) of the outlet header; a first economizer intermediate header (10) and a second economizer intermediate header (12) respectively provided in the tail flue (1), and a high-temperature economizer tube bank (18) suspended between the first economizer intermediate header (10) and the second economizer intermediate header (12), characterized in that, A first vertical hot water delivery pipeline (6) is connected to the top of the intermediate header (10) of the first economizer. After the first vertical hot water delivery pipeline (6) passes through the top wall (2) of the flue, it is connected to one end of the first connecting pipeline section (7) outside the flue. The other end of the first connecting pipeline section (7) outside the flue is connected to the economizer outlet header (8). A left-right V-shaped bend (11) is provided on the first connecting pipeline section (7) outside the flue. A first annular weld is provided at the point where the first vertical hot water delivery pipeline (6) passes through the top wall (2) of the flue. A first angle steel connector (5) is welded to the pipe wall after the first vertical hot water delivery pipeline (6) passes through the top wall (2) of the flue. A first hanger (4) is connected to the upper end of the first angle steel connector (5). The upper end of the first hanger (4) is fixedly connected to the top beam (3).

2. The anti-expansion hanging pipe mechanism for the convective heating surface in the tail flue according to claim 1, characterized in that, A second vertical hot water delivery pipeline (13) is connected to the top of the intermediate header (12) of the second economizer. After the second vertical hot water delivery pipeline (13) passes through the top wall (2) of the flue, it is connected to one end of the second connecting pipeline section (16) outside the flue. The other end of the second connecting pipeline section (16) outside the flue is connected to the economizer outlet header (8). A vertical V-shaped bend (17) is provided on the second connecting pipeline section (16) outside the flue. A second annular weld is provided at the point where the second vertical hot water delivery pipeline (13) passes through the top wall (2) of the flue. A second angle steel connector (14) is welded to the pipe wall after the second vertical hot water delivery pipeline (13) passes through the top wall (2) of the flue. A second hanger (15) is connected to the upper end of the second angle steel connector (14). The upper end of the second hanger (15) is fixedly connected to the top beam (3).

3. The anti-expansion hanging pipe mechanism for the convective heating surface in the tail flue according to claim 2, characterized in that, Between the first vertical hot water delivery pipeline (6) and the second vertical hot water delivery pipeline (13), a low-temperature superheater tube bank (19) and a medium-temperature superheater tube bank (20) are respectively connected.

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