CN112097242A - Multi-tube discharge superheater of waste heat boiler - Google Patents
Multi-tube discharge superheater of waste heat boiler Download PDFInfo
- Publication number
- CN112097242A CN112097242A CN202010985380.4A CN202010985380A CN112097242A CN 112097242 A CN112097242 A CN 112097242A CN 202010985380 A CN202010985380 A CN 202010985380A CN 112097242 A CN112097242 A CN 112097242A
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- Prior art keywords
- tube
- heating surfaces
- panel
- rows
- pipe
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- 239000002918 waste heat Substances 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 88
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- 239000011295 pitch Substances 0.000 claims description 5
- 238000004880 explosion Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
- F22G3/007—Headers; Collectors, e.g. for mixing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
- F22G3/001—Steam tube arrangements not dependent of location
- F22G3/002—Steam tube arrangements not dependent of location with helical steam tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a multi-tube discharge superheater of a waste heat boiler, and belongs to the technical field of power station boiler equipment. The invention comprises a steam inlet header, a pipe group outlet header, a first pipe panel and a second pipe panel which are arranged in parallel, wherein the first pipe panel and the second pipe panel are respectively connected with the steam inlet header and the pipe group outlet header through connecting pipes, a plurality of rows of first heating surfaces are arranged on the first pipe panel, a plurality of rows of second heating surfaces are arranged on the second pipe panel, the first heating surfaces adopt light pipes, the second heating surfaces adopt finned pipes, and the first pipe panel is positioned at the front side of the second pipe panel relative to the flow direction of flue gas. The invention solves the technical problem that the wall temperature of the front and rear heating surfaces has larger temperature difference in the prior art, reduces the design difficulty of the heating surfaces, avoids the risk of leakage and pipe explosion at the welded junction where the heating surfaces are connected with the header, and improves the running safety of the unit.
Description
Technical Field
The invention relates to a superheater of a waste heat boiler, in particular to a multi-tube discharge superheater of the waste heat boiler, and belongs to the technical field of power station boiler equipment.
Background
With the large-scale of the waste heat boiler of the combustion engine, the temperature, the pressure and the flow parameters of the high-pressure main steam and the reheat steam are high. In order to avoid the too high vibration that arouses of the intraductal steam velocity of flow of over heater, avoid simultaneously receiving the evaporation capacity that hot side resistance influences exhaust-heat boiler, current solution is: the superheater adopts two groups of tube panels which are arranged in parallel, each group of tube panels is provided with a plurality of rows of heating surfaces, and the heating surface tubes uniformly use light tubes or finned tubes to form the superheater with a plurality of tube rows. The overhigh flow speed of steam in the pipe of the superheater can be avoided by arranging a plurality of rows of heating surfaces, and meanwhile, the evaporation capacity of the waste heat boiler can be ensured by arranging two groups of pipe panels in parallel.
However, such multi-tube-row superheater has the following disadvantages:
firstly, from the operation of equipment, when smoke flows through each row of heating surfaces, because the heat absorption of the front row of heating surfaces to the smoke is greater than that of the rear row of heating surfaces to the smoke, the temperature of working media in the tubes of the front row of heating surfaces is higher than that of the rear row of heating surfaces, so that the temperature difference exists between the tube wall temperatures of the front row of heating surfaces and the tube wall temperature of the rear row of heating surfaces, and the temperature difference can reach 15-20 ℃ at most for a superheater with main steam temperature higher than 600 ℃; the temperature difference between the pipe walls of the front and rear rows of heating surfaces can cause the thermal expansion amount of the front and rear rows of heating surfaces to be inconsistent, so that the stress of the welding parts of the front and rear rows of heating surfaces and the header is inconsistent, the leakage and the pipe explosion of a welding port are easily caused, and meanwhile, the leakage and the pipe explosion of the welding port of the connecting pipe and the header are also easily caused, so that the safe operation of the unit is influenced;
secondly, from the design of the heating surface, because the temperature difference of the steam temperature in the tubes of the front row and the rear row of the heating surfaces is large, and the temperature of the tube wall of the front row of the heating surfaces is relatively high, higher requirements are provided for the selection of the tube wall thickness and the selection of materials of the front row of the heating surfaces, so that the design conditions of the heating surfaces are harsh, and the design difficulty is greatly increased.
Disclosure of Invention
The invention mainly solves the technical defects of poor operation safety and high design difficulty of the heating surface caused by large temperature difference between the front row heating surface and the rear row heating surface in the prior art, and provides the multi-tube-row superheater which has good operation safety and loose design condition of the heating surface due to small temperature difference between the front row heating surface and the rear row heating surface.
The invention mainly solves the technical problems through the following technical scheme: the invention comprises a steam inlet header, a pipe group outlet header, a first pipe panel and a second pipe panel which are arranged in parallel, wherein the first pipe panel and the second pipe panel are respectively connected with the steam inlet header and the pipe group outlet header through connecting pipes, a plurality of rows of first heating surfaces are arranged on the first pipe panel, a plurality of rows of second heating surfaces are arranged on the second pipe panel, the invention is characterized in that the first heating surfaces adopt light pipes, the second heating surfaces adopt finned pipes, and the first pipe panel is positioned at the front side of the second pipe panel relative to the flow direction of flue gas.
Preferably, the fin pitches of the finned tubes are sequentially decreased in the flow direction of the flue gas.
Preferably, the first heated surface has three rows and the second heated surface has three rows.
Preferably, the first heated surface has three rows and the second heated surface has two rows.
Therefore, the invention has simple structure and reasonable layout and has the following advantages:
in the invention, a plurality of rows of first heating surfaces are arranged on a first tube panel, the first heating surfaces all adopt light tubes, a plurality of rows of second heating surfaces are arranged on a second tube panel, the second heating surfaces all adopt finned tubes, and the first tube panel is positioned on the front side of the second tube panel relative to the flow direction of flue gas. The finned tube has a larger heat receiving area and heat absorbing capacity compared with the light pipe, so that the heat absorbing capacity of the second heat receiving surface is larger than that of the first heat receiving surface. Therefore, when the high-temperature flue gas sequentially flows through the first heating surface and the second heating surface, the heat absorption of the first heating surface to the flue gas is approximately equal to that of the second heating surface to the flue gas, so that the temperature of working media in the tubes of the front and rear rows of heating surfaces is close, and the temperature difference of the tube walls of the front and rear rows of heating surfaces is obviously reduced compared with the prior art.
Therefore, the invention solves the technical problem that the wall temperature of the front and rear heating surfaces has larger temperature difference in the prior art, greatly reduces the risks of leakage and tube explosion of the heating surfaces, the connecting tubes and the welding junctions of the header and improves the operation safety of the unit; meanwhile, the temperature of the tube wall of the front row heating surface is reduced, so that the tube wall thickness of the heating surface and the selection requirement of materials are reduced, the design condition is relatively loose, and the design difficulty is greatly reduced.
Further, the fin pitches of all rows of finned tubes on the second heating surface are sequentially decreased, namely the heating area of the rear row of heating surface is sequentially larger than that of the front row of heating surface. Therefore, the heat absorption capacity of the front and rear rows of heating surfaces of the second tube panel to the flue gas is further close, the temperature difference between the front and rear rows of heating surfaces is further reduced, the thermal expansion capacity is further close, the risks of leakage and tube explosion are further reduced, and the operation safety of the unit is further improved.
Therefore, the invention solves the technical problem of large temperature difference of the front and rear heating surfaces in the prior art, and has the advantages of small design difficulty of the heating surfaces and good operation safety.
Drawings
FIG. 1 is a prior art schematic;
FIG. 2 is a schematic diagram of a preferred embodiment of the present invention;
FIG. 3 is a schematic illustration of another preferred embodiment of the present invention;
FIG. 4 is a schematic view of a turn fin tube used for the second heated surface.
Description of reference numerals: 1. a steam inlet header; 2. a tube bank outlet header; 3. a first tube panel; 31. a first heated surface; 32. a first tube panel inlet header; 33. a first tube panel outlet header; 4. a second tube panel; 41. a second heated surface; 42. a second tube panel inlet header; 43. a second tube panel outlet header; 5. and (4) connecting the pipes.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1: as shown in fig. 2 and 4, the present invention comprises a steam inlet header 1, a tube group outlet header 2, a first tube panel 3 and a second tube panel 4, which are arranged in parallel between the steam inlet header 1 and the tube group outlet header 2, wherein the first tube panel 3 is located at the front side of the second tube panel 4 relative to the flow direction of flue gas;
the first tube panel 3 comprises a first tube panel inlet header 32 connected with the steam inlet header 1 through a connecting tube 5, a first tube panel outlet header 33 connected with the connecting tube 5 and the tube group outlet header 2, and three rows of first heating surfaces 31 arranged between the first tube panel inlet header 32 and the first tube panel outlet header 33, wherein the first heating surfaces 31 use light pipes;
the second tube panel 4 comprises a second tube panel inlet header 42 connected with the steam inlet header 1 through a connecting tube 5, a second tube panel outlet header 43 connected with the tube group outlet header 2 through the connecting tube 5, and three rows of second heating surfaces 41 arranged between the second tube panel inlet header 42 and the second tube panel outlet header 43;
the second heating surface 41 adopts spiral finned tubes, and the fin pitches of each row of spiral finned tubes on the second heating surface 41 are sequentially decreased progressively according to the flow direction of the flue gas.
When the invention is applied to a unit with main steam temperature of 610 ℃, superheated steam (570 ℃) from a low-temperature superheater enters a steam inlet header 1 and then is divided into two parts, and the two parts respectively enter a first tube panel inlet header 32 and a second tube panel inlet header 42 through a connecting pipe 5;
the steam entering the first tube panel inlet header 32 is divided into three streams, the three streams enter three rows of first heating surfaces 31 respectively, the steam is heated by the first heating surfaces 31 and then is converged into the first tube panel outlet header 33, and the temperature of the steam in the tubes of the first row of first heating surfaces 31 is 614 ℃;
the steam entering the second tube panel inlet header 42 is divided into 3 streams and respectively enters the three rows of second heating surfaces 41, the steam is heated by the second heating surface tubes 41 and then flows into the second tube panel outlet header 43, and the temperature of the steam in the last row of second heating surfaces 41 is 606 ℃;
the steam that has converged into the first panel outlet header 33 and the second panel outlet header 43 is converged into the tube group outlet header 2 through the connection tube 5 to generate steam of about 610 c.
Example 2: as shown in fig. 3 and 4, the present invention includes a steam inlet header 1, a tube group outlet header 2, a first tube panel 3 and a second tube panel 4, which are arranged in parallel between the steam inlet header 1 and the tube group outlet header 2, wherein the first tube panel 3 is located at the front side of the second tube panel 4 relative to the flow direction of flue gas;
the first tube panel 3 comprises a first tube panel inlet header 32 connected with the steam inlet header 1 through a connecting tube 5, a first tube panel outlet header 33 connected with the tube group outlet header 2 through the connecting tube 5, and three rows of first heating surfaces 31 arranged between the first tube panel inlet header 32 and the first tube panel outlet header 33, wherein the first heating surfaces 31 adopt light tubes;
the second tube panel 4 comprises a second tube panel inlet header 42 connected with the steam inlet header 1 through a connecting tube 5, a second tube panel outlet header 43 connected with the tube group outlet header 2 through the connecting tube 5, and a second row of second heating surfaces 41 arranged between the second tube panel inlet header 42 and the second tube panel outlet header 43;
the second heating surface 41 adopts a spiral finned tube, and the fin pitch of the spiral finned tube on the second heating surface 41 at the rear row is smaller than that of the spiral finned tube on the second heating surface 41 at the front row.
When the invention is applied to a unit with the main steam temperature of 600 ℃, superheated steam (565 ℃) from a low-temperature superheater enters a steam inlet header 1 and then is divided into two parts, and the two parts respectively enter a first tube panel inlet header 32 and a second tube panel inlet header 42 through a connecting pipe 5;
the steam entering the first tube panel inlet header 32 is divided into three streams, the three streams enter three rows of first heating surfaces 31 respectively, the steam is heated by the first heating surfaces 31 and then is converged into the first tube panel outlet header 33, and the temperature of the steam in the tubes of the first row of first heating surfaces 31 is 604 ℃;
the steam entering the second tube panel inlet header 42 is divided into two streams, the two streams enter the second row of second heating surfaces 41 respectively, the steam is heated by the second heating surface tubes 41 and then flows into the second tube panel outlet header 43, and the temperature of the steam in the last row of second heating surfaces 41 is 596 ℃;
the steam that has converged into the first panel outlet header 33 and the second panel outlet header 43 is converged into the tube group outlet header 2 through the connection tube 5 to generate steam of about 600 ℃.
Of course, the drawings and examples are only for the purpose of illustrating and explaining the present invention and should not be taken as unduly limiting the invention. All technical solutions which are equivalent to each other and can be obtained by a person skilled in the art according to the present invention fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides a superheater is arranged to exhaust-heat boiler's multitube, includes steam inlet collection case (1), nest of tubes export collection case (2), parallelly connected first tube panel (3) and second tube panel (4) that set up, first tube panel (3) with second tube panel (4) respectively through connecting pipe (5) with steam inlet collection case (1) with nest of tubes export collection case (2) are connected, arrange on first tube panel (3) and have a plurality of rows of first heating surface (31), arrange on second tube panel (4) and have a plurality of rows of second heating surface (41), its characterized in that, first heating surface (31) adopt the light pipe, second heating surface (41) adopt the finned tube, first tube panel (3) are located for the flue gas flow direction the front side of second tube panel (4).
2. A multi-tube row superheater of a waste heat boiler as recited in claim 1, wherein the fin pitches of the finned tubes decrease in sequence in the direction of flue gas flow.
3. A multi-tube row superheater for a waste heat boiler according to claim 1 or 2, characterized in that the first heating surface (31) has three rows in total and the second heating surface (41) has three rows in total.
4. A multi-tube row superheater for a waste heat boiler according to claim 1 or 2, characterized in that the first heating surface (31) has three rows in total and the second heating surface (41) has two rows in total.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985380.4A CN112097242A (en) | 2020-09-18 | 2020-09-18 | Multi-tube discharge superheater of waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985380.4A CN112097242A (en) | 2020-09-18 | 2020-09-18 | Multi-tube discharge superheater of waste heat boiler |
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| Publication Number | Publication Date |
|---|---|
| CN112097242A true CN112097242A (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010985380.4A Pending CN112097242A (en) | 2020-09-18 | 2020-09-18 | Multi-tube discharge superheater of waste heat boiler |
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| Country | Link |
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| CN (1) | CN112097242A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007690A (en) * | 2021-03-12 | 2021-06-22 | 哈尔滨锅炉厂有限责任公司 | Furnace heat exchanger and using method thereof |
| CN113175685A (en) * | 2021-04-23 | 2021-07-27 | 华能洋浦热电有限公司 | Flue gas guide system and gas turbine exhaust-heat boiler |
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|---|---|---|---|---|
| CN1248683A (en) * | 1999-07-29 | 2000-03-29 | 上海交通大学 | Pitch changeable type superheater and reheater |
| CN2495910Y (en) * | 2001-09-12 | 2002-06-19 | 王孟浩 | Mechanism for reducing temp. deviation of over-heating device of boiler reheater |
| CN201795473U (en) * | 2010-07-21 | 2011-04-13 | 盐城市锅炉制造有限公司 | Dust removing steam superheater |
| CN105042556A (en) * | 2015-05-27 | 2015-11-11 | 西安交通大学 | Burner-overhead vertical U-structured oil and gas boiler |
| WO2017088742A1 (en) * | 2015-11-25 | 2017-06-01 | 东方电气集团东方锅炉股份有限公司 | Water wall of supercritical circulating fluidized bed boiler having high flow stability at low load, and method of realizing low mass flow rate |
| CN109708096A (en) * | 2019-02-11 | 2019-05-03 | 济南锅炉集团有限公司 | A kind of intersection mixed flow superheater |
| CN209013798U (en) * | 2018-09-20 | 2019-06-21 | 苏州仕净环保科技股份有限公司 | Mix finned heat exchanger |
| CN212537809U (en) * | 2020-09-18 | 2021-02-12 | 东方菱日锅炉有限公司 | Multi-tube discharge superheater of waste heat boiler |
-
2020
- 2020-09-18 CN CN202010985380.4A patent/CN112097242A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248683A (en) * | 1999-07-29 | 2000-03-29 | 上海交通大学 | Pitch changeable type superheater and reheater |
| CN2495910Y (en) * | 2001-09-12 | 2002-06-19 | 王孟浩 | Mechanism for reducing temp. deviation of over-heating device of boiler reheater |
| CN201795473U (en) * | 2010-07-21 | 2011-04-13 | 盐城市锅炉制造有限公司 | Dust removing steam superheater |
| CN105042556A (en) * | 2015-05-27 | 2015-11-11 | 西安交通大学 | Burner-overhead vertical U-structured oil and gas boiler |
| WO2017088742A1 (en) * | 2015-11-25 | 2017-06-01 | 东方电气集团东方锅炉股份有限公司 | Water wall of supercritical circulating fluidized bed boiler having high flow stability at low load, and method of realizing low mass flow rate |
| CN209013798U (en) * | 2018-09-20 | 2019-06-21 | 苏州仕净环保科技股份有限公司 | Mix finned heat exchanger |
| CN109708096A (en) * | 2019-02-11 | 2019-05-03 | 济南锅炉集团有限公司 | A kind of intersection mixed flow superheater |
| CN212537809U (en) * | 2020-09-18 | 2021-02-12 | 东方菱日锅炉有限公司 | Multi-tube discharge superheater of waste heat boiler |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007690A (en) * | 2021-03-12 | 2021-06-22 | 哈尔滨锅炉厂有限责任公司 | Furnace heat exchanger and using method thereof |
| CN113175685A (en) * | 2021-04-23 | 2021-07-27 | 华能洋浦热电有限公司 | Flue gas guide system and gas turbine exhaust-heat boiler |
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