WO2013016844A1

WO2013016844A1 - Integrated tube rows connecting block instead of tubes bending parts in power station boiler

Info

Publication number: WO2013016844A1
Application number: PCT/CN2011/001276
Authority: WO
Inventors: 周菊明
Original assignee: 上海昌强电站配件有限公司
Priority date: 2011-08-03
Filing date: 2011-08-03
Publication date: 2013-02-07

Abstract

Disclosed in the present invention is an integrated tube rows connecting block instead of tubes bending parts in power station boiler, which comprises a distributary channel, a single-flow channel and an X-shaped connecting block with X-shaped longitudinal section arranged in lateral configuration. The four top corners of the X-shaped connecting block transversely form four horizontal top corner lines. Multi-group composite channels are arranged from left to right in the X-shaped connecting block. The outlets of the composite channels are uniformly distributed on four horizontal top corner lines of the X-shaped connecting block and form an upper-front row interface (1), an upper-rear row interface (2), a lower-front row interface (4) and a lower-rear row interface (3) respectively. The integrated tube rows connecting block has the advantages of reasonable space utilization, which ensures that the wall thicknesses between channels corresponding to the prior tubes bending parts are thickened at least 50 percent and maximally ensures tube rows safe operation so as to avoid stress concentration trouble and explosion of this position. The integrated tube rows connecting block also has the advantages of convenient maintenance which eliminates the maintenance bottleneck and convenient welding and assembly with 100 percent through ball rate.

Description

Integrated pipe row connection block for replacing the bent portion of the pipe in the power station boiler

Technical field

[0001] The present invention relates to the field of boiler tube rows, and more particularly to an integrated tube row connection block for replacing a tube bend in a power station boiler.

Background technique

[0002] The steam of the power station boiler is completely ventilated by the combination of various types of pipes. A large number of pipes are interdigitated in the furnace to form a pipe row. Due to space, temperature and other restrictions, the space reserved for the pipe arrangement during design is very narrow, and the pipe The height is required to reach several tens of meters. With the domestic environmental protection and rational use of resources and the policy guidance of the country's large pressure, the environmental protection boilers of various power stations are getting smaller and smaller when they are heated.

[0003] Taking the tube row of the tube with an outer diameter of 32 mm as an example, the inner hole is 21 mm, and the two tubes are close together and occupy a space of 64 mm width, so that the center distance of the two adjacent tubes is 32 mm. However, according to the national standard, the center-to-center distance between the two adjacent pipes is 47. 5mm, which takes up more space. Therefore, in order to meet the overall design requirements of the limited space in the boiler, it is necessary to bend and deform the different types of tubes in the tube row to meet the limited space, see Figure 7. As a result, a large number of tubes are bent, and the bending portion causes the bending outer diameter, the wall thickness is reduced, the inner diameter of the ball is reduced, and the bending portion is increased, resulting in stress concentration after the bending tube is formed. In the final operation process, the ventilation volume is reduced, which affects the power generation. It mainly leaves hidden dangers in operation and is extremely explosive. In case of a tube explosion accident, the entire power station boiler unit must be shut down. In addition, since the power station boiler is at high temperature If the operation is carried out in a small space, even if the furnace is shut down for production, maintenance is very difficult.

Summary of the invention [0004] The present invention is to overcome the deficiencies of the prior art, in the original tube row in various types of tube bending concentrated parts, instead of using a plurality of sets of composite channels of X-shaped connecting blocks to connect, the X-shaped connecting block The composite channel provided inside can be designed to be staggered and curved according to the space requirement, thus replacing the curved portion of the original pipe.

[0005] In order to achieve the above object, an integrated pipe row connection block for replacing a bent portion of a pipe in a power plant boiler is designed, including a split flow channel and a single flow passage, and is characterized by: a laterally arranged X in a longitudinal section. The connecting block, the four apex angles of the X-shaped connecting block form four horizontal apex lines laterally, and the X-shaped connecting blocks are arranged with multiple sets of composite channels from left to right, and the outlets of the composite channel on the X-shaped connecting block are evenly distributed in four The upper front row interface, the upper rear row interface, the lower front row interface, and the lower rear row interface are respectively formed on the horizontal corner line.

[0006] The center-to-center distance between the two outlets adjacent to each other on the left and right sides of the X-shaped connecting block is equal to the required center-to-center distance of the pipe connected in the power station boiler.

[0007] The composite channel adopts any combination of a single flow channel and a split flow channel.

[0008] The arbitrary combination of the single flow channel and the split flow channel is formed by using one split flow channel and two left and right single flow channels, the split flow channel is X-shaped or approximately X-shaped, and the upper two ports of the split flow channel are formed. Two upper front and rear interfaces on the X-shaped connecting block, and the lower two ports of the splitting channel form two adjacent lower rear interfaces on the X-shaped connecting block, the middle of the left single-flow channel and the middle of the right single-flow channel The left single flow channel and the right single flow channel are respectively set to be curved or linear according to the inner space of the X-shaped connection block, and the upper ports of the left and right single flow channels are respectively respectively Two upper and lower rear interfaces are formed, and the lower left and right single flow channels form two lower front interfaces respectively, and the two upper and lower single channels of the left and right single flow channels and the two upper front channels of the split flow channel The row interfaces are arranged symmetrically, and the two lower front rows of the left and right single flow channels are symmetrically arranged with the two lower rear interfaces of the split channels. [0009] Compared with the prior art, the present invention is independent of the tube and the tube in the original bending portion of the tube row, and the curved portion is now designed to have staggered curved passages inside the integral X-shaped connecting block. Instead, the original staggered and unordered tube rows are immediately aligned, ensuring that the pipeline layout is reasonable, which is beneficial to the rational use of space, and at least 50% thicker than the wall thickness between the channel and the channel where the original pipe is bent, which is equivalent to The wall thickness of the pipe at the original bend is at least 50% thicker, which ensures the safety of the pipe row to the maximum extent, eliminates the hidden dangers in the stress concentration, and ensures that the pipe does not burst; even if it is connected with the integrated pipe row of the power station boiler The straight pipe connected to the block bursts, because the interface of the integrated pipe row connection block of the power station boiler is arranged in a straight line, the pipeline is clear at a glance, the maintenance is convenient, and the maintenance bottleneck is effectively solved; the welding assembly is convenient, the ball passing rate is up to 100%, easy to maintain.

DRAWINGS

1 is a front elevational view showing the appearance of a product in the first to third embodiments of the present invention.

2 is a left side view of FIG. 1.

3a is a cross-sectional view taken along line C-C of FIG. 1 when the product of the first embodiment of the present invention is a type.

3b is a cross-sectional view taken along line A-A of FIG. 2 when the product 1 is a type in the embodiment of the present invention.

3c is a cross-sectional view taken along line B-B of FIG. 2 when the product of the first embodiment of the present invention is a type.

4a is a cross-sectional view taken along line D-D of FIG. 1 when the product of the second embodiment of the present invention is of a second type.

4b is a cross-sectional view taken along line A-A of FIG. 2 when the product of the second embodiment of the present invention is of the second type.

4c is a cross-sectional view taken along line B-B of FIG. 2 when the product of the second embodiment of the present invention is of the second type.

5a is a cross-sectional view taken along line D-D of FIG. 1 when the product of the third embodiment of the present invention is a three-type.

5b is an enlarged cross-sectional view taken along line AA of FIG. 2 when the product of the third embodiment of the present invention is a three-type. 5c is an enlarged cross-sectional view of the B-B shown in FIG. 2 when the product of the third embodiment of the present invention is a three-type.

6a is a side view of the embodiment of the present invention in which the product is 16-pass.

6b is a top view of FIG. 6a.

6c is a B-B diagram shown in FIG. 6a.

6d is a diagram showing the A-A direction shown in FIG. 6a.

6e is a C-C diagram shown in FIG. 6b.

6f is a DD diagram shown in FIG. 6b.

[0027] FIG. 7 is a partial schematic view of the original tube tube bend.

detailed description

[0028] Referring to FIG. 1 and FIG. 2, an integrated pipe row connection block for replacing a bent portion of a pipe in a power plant boiler includes a flow dividing channel and a single flow channel, and is characterized by: a X-shaped horizontally arranged X-shaped longitudinal section The connecting block, the four apex angles of the X-shaped connecting block form four horizontal apex lines laterally, and the X-shaped connecting blocks are arranged with multiple sets of composite channels from left to right, and the exits of the composite channel on the X-shaped connecting block are evenly distributed at four levels The upper front row interface 1, the upper rear row interface 2, the lower front row interface 4, and the lower rear row interface 3 are respectively formed on the top corner line.

[0029] The center distances of the two outlets adjacent to each other on the left and right sides of the X-shaped connection block are equal to the required center distance of the pipe connected in the power station boiler.

[0030] The composite channel adopts any combination of a single flow channel and a split flow channel.

[0031] The arbitrary combination of the single flow channel and the split flow channel is constituted by one split flow channel 13 and two left and right single flow channels, and the split flow channel 13 is X-shaped or approximately X-shaped, and the upper two of the split flow channel The port forms two adjacent upper front row interfaces 1 on the X-shaped connecting block, and the lower two ports of the splitting channel form two adjacent lower rear row interfaces 3 on the X-shaped connecting block, left single The middle portion of the flow channel 31 and the middle portion of the right single flow channel 32 are respectively located on both sides or the same side of the middle portion of the branching channel 13, and the left single flow channel 31 and the right single flow channel 32 are set to be curved according to the internal space of the X-shaped connecting block. After the straight line, the upper ports of the left and right single flow channels respectively form two upper rear row interfaces 2, and the left and right two single stream channels lower ports respectively form two lower front row interfaces 4, left and right. The two upper rear row interfaces 2 of the single flow channel are arranged symmetrically with the two upper front row interfaces 1 of the split flow channel 13, and the two lower front row interfaces 4 of the left and right single flow channels and two of the split flow channels 13 The lower rear row interface 3 is symmetrically arranged.

[0032] The present invention can be obtained by die forging and machining. The main overall appearance of the integrated pipe row connecting block of the pipe bending part of the power plant boiler can be kept unchanged, but can be based on the actual situation of the power station boiler. The size of the space is adjusted, its size and quantity are adjusted, or the internal passages are spatially staggered and bent. See Figures 3a to 3c for a 32-pass type of the present invention; see Figure 4a to Figure 4c. It is a 32-pass type II product of the present invention; see Figs. 5a to 5c are 32-pass type three-type products of the present invention, and Figs. 6a to 6f are one type of the 16-pass product of the present invention.

[0033] Since the original mutually independent tubes are changed to the integrated block shape in which the internal passages replace the tubes, the partition between the two tubes is shared by the two tubes, which is equivalent to the two of the original two tubes. The wall thickness between the channels is increased by at least 50%. In the actually prepared product, if the wall thickness of the original pipe is to be maintained, the wall thickness between the two channels can be increased by 100%.

[0034] In practical application, the present invention is replaced by the elbow portion of the original tube row, that is, the straight tube portion of the tube row is connected to each interface of the X-shaped connecting block, and the number of X-shaped connecting blocks can be Need to adjust. In this way, the elbow portion of the stress concentration which is prone to bursting is replaced by an X-shaped connecting block with a wall thickness of at least 50%, ensuring that no burst occurs in this portion; even the straight pipe portion to which it is attached Explosion, due to the integrated tube row connection of the power station boiler The straight-line arrangement of the interface of the block makes the pipeline clear at a glance, the welding assembly is very convenient, and the maintenance is easy; and because all the single-flow channels and the split channels inside the X-shaped connecting block are machined, it is not necessary to perform like a pipe. The present invention will be further described with reference to the embodiments without bending, so that the present invention is not limited thereto.

Embodiment 1

Referring to 3a to 3c, in this example, a 32-pass type product adopts four X-shaped split channels 13, and each side of each of the split channels 13 has a single flow channel, that is, a left single flow channel 31 and a right The single flow channel 32, the left single flow channel 31 and the right single flow channel 32 have a total of eight single flow channels located on the slope of the pair of corners of the X-shaped connection block, and four of the four flow channels are located on the other pair of the X-shaped connection blocks. On the slope where the corner line is located, one shunt channel 13 and the left single stream channel and the right single stream channel form a composite channel with a total of eight interfaces above and below. In this example, there are four composite channels from left to right;

The middle portions of the left single flow channel 31 and the right single flow channel 32 in each composite channel are symmetrically arranged on the left and right sides of the middle portion of the split channel 13, respectively, and the middle portion of the left single flow channel 31 and the middle portion of the right single flow channel 32 Bend to the left and right sides respectively.

Embodiment 2

See 4a~4c. In this example, the 32-pass type II product uses two left and right single flow channels. The middle of the two single flow channels are located on the same side of the middle part of the split channel. In this example, the split channel 13 is near. The X-shaped splitting channel, that is, the common pipe portion in the middle of the splitting channel is a straight pipe 41, the upper and lower ends of the straight pipe 41 are respectively divided into two left and right branch pipes 4-1, and the left and right two branch pipes 4-1 are located in the straight pipe 41 On the same side, and there is a horizontal channel 4 - 3 between the left branch and the right branch at the same end of the split channel 13; A split channel 13 combines a left single stream channel 31 and a right single stream channel 32 to form a composite channel. The entire product has four composite channels from left to right, and any two adjacent composite channels are symmetrically arranged in pairs;

Wherein, the eight single-flow channels form eight upper rear discharge ports 2 and eight lower front discharge ports 4, and the four divided flow channels form eight upper front discharge ports and eight lower rear discharge ports, wherein the left single flow passage 31 The front-back direction is curved and parallel to the side-section vertical plane of the X-shaped connecting block, and the right single-flow channel 32 is located on the inclined surface of the X-shaped connecting block on the inclined surface and curved in the left-right direction, and the four dividing channels are located in the X-shaped connecting block. a diagonal line on the diagonal line;

See 4a, 4b. Take the composite channel on the leftmost side of the product as an example. The structure is: The left single-flow channel 31 is parallel to the side-section vertical plane of the X-shaped connection block, and the near-middle part of the left single-flow channel is bent forward. The middle of the right single-flow passage 32 is bent to the left on the inclined surface where the right single-flow passage 32 is located, and the middle portion of the left single-flow passage 31 and the right single-flow passage 32 are located on the left side of the portion of the straight pipe 41 in the middle of the split passage 13 .

Example 3

Referring to 5a to 5c, in this example, the 32-way three-type product, the split passage also adopts an X shape, and the intermediate portion of the X shape is bent forward, and the relative positions of the single flow passage and the split passage are similar to those in the first embodiment. However, the left single flow channel and the right single flow channel are curved in the left and right direction and the front and rear directions according to the arrangement space.

Embodiment 4

Referring to FIG. 6a to FIG. 6f, in this example, one type of 16-pass product is provided with two split channels, two left single flow channels, and two right single flow channels. The internal structure is similar to that of Embodiment 2, one The split channel 13 forms a composite channel with the left single flow channel 31 and the right single flow channel 32. In this example, a total of two symmetrical composite channels are used, and the left composite channel is taken as an example, the split channel and the real channel. Similarly to the second embodiment, the left single-flow passage 31 is parallel to the side vertical plane of the X-shaped connecting block and the middle portion of the left single-flow passage is bent rearward, and the right single-flow passage 32 is located near the middle to the left rear of the X-shaped connecting block. Bending, see Figure 6c.

[0039] The shunt channel in the above example can be replaced with two single-flow channels according to actual needs, and the two single-flow channels can be designed into a curved structure as needed.

Claims

Rights request

1. An integrated pipe row connection block for replacing a bent portion of a pipe in a power station boiler, comprising a split flow channel, a single flow channel, characterized by: a X-shaped connecting block arranged in a longitudinally X-shaped longitudinal direction, an X-shaped connection The four apex angles of the block form four horizontal apex lines laterally. The X-shaped connecting blocks are arranged with multiple sets of composite channels from left to right. The exits of the composite channels on the X-shaped connecting blocks are uniformly distributed on four horizontal apex lines and respectively Form the upper front row interface (1), the upper rear row interface (2), the lower front row interface (4), and the lower rear row interface (3).

2. The integrated pipe row connection block for replacing a bent portion of a pipe in a power station boiler according to claim 1, wherein: a center distance between two outlets adjacent to each other on the left and right sides of the X-shaped connection block is equal to that in the power plant boiler The required center distance for the connected pipe.

3. The integrated tube row connection block for replacing a bent portion of a tube in a power station boiler according to claim 1, wherein: the composite channel adopts any combination of a single flow channel and a split flow channel.

4. The integrated pipe row connection block for replacing a bent portion of a pipe in a power station boiler according to claim 3, wherein: any combination of the single flow channel and the split flow channel adopts a split flow channel (13) And two left and right single flow channels, the shunt channel

(13) is X-shaped or approximately X-shaped, the upper two ports of the splitting channel form two adjacent upper front-row interfaces (1) on the X-shaped connecting block, and the lower two ports of the splitting channel form an adjacent X-shaped connecting block The two lower rear interfaces (3), the middle of the left single flow channel (31) and the middle of the right single flow channel (32) are respectively located on either side or the same side of the middle of the split channel (13), and the left single flow channel (31), the right single-flow channel (32) according to the X-shaped connection block internal space needs to be set to be curved or linear, the left and right two single-flow channel upper port respectively form two upper rear interface

(2), the left and right two single-flow channel lower ports form two lower front row interfaces (4), left, The two upper and lower rear interfaces of the right two single flow channels (2) are symmetrical with the two upper front interfaces (1) of the split flow channel (13), and the two lower ones of the left and right single flow channels The row interface (4) is symmetrically arranged with the two lower rear ports (3) of the split channel (13).