CN216976770U - Explosion-proof device and waste heat utilization system for high-temperature coal economizer - Google Patents
Explosion-proof device and waste heat utilization system for high-temperature coal economizer Download PDFInfo
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- CN216976770U CN216976770U CN202120410263.5U CN202120410263U CN216976770U CN 216976770 U CN216976770 U CN 216976770U CN 202120410263 U CN202120410263 U CN 202120410263U CN 216976770 U CN216976770 U CN 216976770U
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Abstract
The embodiment of the utility model discloses an explosion-proof device for a high-temperature economizer and a waste heat utilization system, wherein the explosion-proof device for the high-temperature economizer comprises: the support piece is used for being fixed on the high-temperature economizer and comprises a right-angle support and an arc-shaped piece, and two ends of the right-angle support are respectively connected with two ends of the arc-shaped piece; the turbulence piece comprises a plurality of turbulence pipes, and is a plurality of the turbulence pipes are arranged along the arc-shaped surface of the arc-shaped piece, each of the turbulence pipes is arranged towards the header of the high-temperature economizer, and the pipe diameter ends of the turbulence pipes are a plurality of projection positions of the turbulence pipes on the horizontal plane and a plurality of heat exchange pipes of the high-temperature economizer in a one-to-one correspondence mode. The technical scheme of the utility model solves the problems of local overheating and tube explosion of the heat exchange tube caused by concentrated washing of turbulent smoke gas on the heat exchange tube bundle at the front side of the high-temperature economizer furnace caused by the steering chamber, and effectively ensures the stable operation of a boiler system.
Description
Technical Field
The embodiment of the utility model relates to the technical field of gas power generation of iron and steel enterprises, in particular to an explosion-proof device and a waste heat utilization system for a high-temperature economizer.
Background
The high-temperature economizer is important flue gas waste heat recycling equipment in a boiler tail flue and is used for heating boiler feed water to saturation temperature under the working pressure of a steam drum. The high-temperature economizer of the vertical gas-fired boiler is a first heat exchange system for enabling hearth flue gas to enter a tail flue through a steering chamber. Under the steering action of the steering chamber, the flue gas flow field on the front side of the high-temperature economizer furnace is more complicated, the heat exchange tube bundle at the position is seriously scoured, and excessive heat exchange exists. Taking a 130t/h vertical gas-fired boiler as an example, the wall temperature of a heat exchange tube at the front side of the boiler is actually measured to be 65 ℃ higher than that at the rear side of the boiler. The smoke with large flow, high temperature and high flow rate flows to the front side of the furnace in a relatively concentrated manner, so that the heat exchange tube bundle in the area is extremely easy to overheat and even explode, and the safe and stable operation of the unit is seriously threatened.
In order to adapt to a complex flue gas flow field and dredge and concentrate turbulent flue gas, how to develop an explosion-proof device and a waste heat utilization system for a high-temperature economizer, reduce the heat exchange strength of a heat exchange tube bundle at the front side of a high-temperature economizer furnace, prevent overheating, and have great significance, thereby becoming a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an explosion-proof equipment and waste heat utilization system for high temperature economizer, has solved and has concentrated the heat exchanger tube bank that erodees high temperature economizer furnace front side because of the turbulent flue gas that the steering room caused, and the heat exchange tube local overheating and the booster problem that cause effectively guarantee boiler system steady operation.
The application provides the following technical scheme through an embodiment of the application:
in a first aspect of embodiments of the present invention, there is provided an explosion-proof apparatus for a high-temperature economizer, including:
the support piece is used for being fixed on the high-temperature economizer and comprises a right-angle support and an arc-shaped piece, and two ends of the right-angle support are respectively connected with two ends of the arc-shaped piece;
the turbulence piece comprises a plurality of turbulence pipes, and is a plurality of the turbulence pipes are along the arc-shaped surface of the arc-shaped piece is arranged and every is arranged at the pipe diameter end of a header of the high-temperature economizer and is a plurality of the projection positions of the turbulence pipes on the horizontal plane and a plurality of heat exchange pipes of the high-temperature economizer in a one-to-one correspondence mode.
In a second aspect of the embodiments of the present invention, there is provided a waste heat utilization system, including:
the high-temperature economizer comprises a shell, a heat exchange tube and a header, wherein the lower part of the shell comprises a flue gas inlet, the upper part of the shell comprises a flue gas outlet, the heat exchange tube is arranged in the shell, the header is arranged on the shell and comprises an inlet header and an outlet header, and two ends of the heat exchange tube are respectively connected with the inlet header and the outlet header;
The support piece of the explosion-proof device for the high-temperature economizer is fixed on the high-temperature economizer.
Further, the right-angle bracket includes a horizontal portion and a vertical portion, and the horizontal portion is disposed along a length direction of the header of the high-temperature economizer.
Further, the horizontal portion has a length that covers the plurality of heat exchange pipes of the high-temperature economizer.
Further, the high-temperature economizer is arranged between the furnace wall of the turning chamber and the vertical gas-fired steam boiler, and the ratio of the lengths of the horizontal part and the vertical part is equal to the ratio of the width edge to the long edge of the furnace wall of the turning chamber.
Further, the arc-shaped piece is an arc-shaped segment of an equiangular spiral, wherein the center point of the equiangular spiral is positioned on the plane of the furnace wall on the front side of the furnace.
Further, the pipe diameter of the turbulent flow pipe is the same as that of the heat exchange pipe of the high-temperature economizer.
Furthermore, the high-temperature economizer further comprises a supporting beam, the heat exchange tubes are connected with the supporting beam, and the supporting piece of the explosion-proof device is fixed on the supporting beam of the high-temperature economizer.
Further, the number of the spoiler is the same as the number of the support beams of the economizer.
Further, the waste heat utilization system further comprises: the vertical gas-steam boiler comprises a boiler body, a first flue and a second flue, wherein the boiler body is communicated with the flue gas inlet of the high-temperature economizer through the first flue, and the boiler body is communicated with the water pump through the second flue.
One or more technical solutions provided in the embodiments of the present application at least include the following technical effects or advantages:
the embodiment of the utility model discloses an explosion-proof device for a high-temperature economizer and a waste heat utilization system, which comprise: the support piece is used for being fixed on the high-temperature economizer and comprises a right-angle support and an arc-shaped piece, and two ends of the right-angle support are respectively connected with two ends of the arc-shaped piece; the turbulence piece comprises a plurality of turbulence pipes, and is a plurality of the turbulence pipes are arranged along the arc-shaped surface of the arc-shaped piece, each of the turbulence pipes is arranged towards the header of the high-temperature economizer, and the pipe diameter ends of the turbulence pipes are a plurality of projection positions of the turbulence pipes on the horizontal plane and a plurality of heat exchange pipes of the high-temperature economizer in a one-to-one correspondence mode. The turbulence member forms turbulence, scattering and uniform distribution dredging effects on turbulent flue gas which is centrally folded to the front side of the high-temperature economizer furnace through the steering chamber. The intensity of the coal economizer intensively washed by the flue gas is reduced, and the situations of excessive heat exchange at the front side of the high-temperature coal-saving gas furnace, over-temperature of a heat exchange pipe and even overheating and pipe explosion are avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an explosion-proof device for a high-temperature coal economizer, which is provided by the embodiment of the utility model;
fig. 2 is a top view of a waste heat utilization system according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a high-temperature economizer provided in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an arc-shaped part of an equiangular spiral in the explosion-proof device for the high-temperature coal economizer, provided by the embodiment of the utility model;
the reference numerals are illustrated below:
1-support, 11-right angle stand, 111-horizontal portion, 112-vertical portion, 12-arc member,
2-turbulence piece, 21-turbulence pipe;
3-a high-temperature economizer, 31-a shell, 32-a heat exchange tube and 33-a header; 34. a supporting beam;
4-a vertical gas-steam boiler; 41-furnace front side furnace wall;
5-turning chamber furnace wall; 51-broadside; 52. the long side.
Detailed Description
The embodiment of the application solves the technical problem that metallurgical iron making in the prior art lacks an experimental device for flue gas desulfurization and denitration by providing a recovery device for nutritive salt fermented by ferroalloy industrial tail gas.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
as a typical implementation manner of the embodiment of the present application, there is provided an explosion-proof apparatus for a high-temperature economizer, as shown in fig. 1, including:
the support piece 1 is used for being fixed on a high-temperature coal economizer, the support piece 1 comprises a right-angle support 11 and an arc-shaped piece 12, and two ends of the right-angle support 11 are respectively connected with two ends of the arc-shaped piece 12;
In this embodiment, the pipe diameter end of each turbulent flow pipe 21 faces the header of the high-temperature economizer, and the projection positions of the plurality of turbulent flow pipes 21 on the horizontal plane correspond to the plurality of heat exchange pipes of the high-temperature economizer one by one: when the flue gas is uniformly dredged, the reasonable passing of quantitative flue gas is ensured, the heat exchange environment is improved, and the uniformity of the integral heat exchange of the economizer tube bank is ensured. A plurality of turbulent flow pipe 21 is followed the arcwall face setting of arc 12 plays the scour protection cushioning effect, satisfies flue gas scouring strength.
Under the normal operating condition of the boiler, the turbulence piece 2 and the support piece 1 are unified and integral, and form turbulence, scattering and uniform distribution dredging effects on turbulent flow smoke which is intensively folded to the front side of the high-temperature economizer through the steering chamber. The intensity of the coal economizer flushed by the smoke in a centralized manner is reduced, and the conditions of excessive heat exchange at the front side of the high-temperature coal-saving furnace, overtemperature of a heat exchange tube and even overheating and tube explosion are avoided. According to the embodiment of the utility model, the turbulence device is arranged above the windward side of the front side of the economizer to form the curved surface grid, so that the turbulence, scattering and uniform distribution effects on concentrated turbulent flow smoke are achieved, and the heat exchange strength is reduced. The temperature of the heat exchange tube at the front side of the furnace is reduced to the design level, so that the problems of overheating, tube explosion, leakage of a steam-water system and the like of the heat exchange tube at the front side of the high-temperature coal economizer are effectively solved.
As an alternative embodiment, the right-angle bracket 11 includes a horizontal portion 111 and a vertical portion 112, and the horizontal portion 111 is disposed along a length direction of the header of the high-temperature economizer. Under the temperature of the flue gas from the high-temperature coal economizer, the material characteristics of the framework of the right-angle support are not changed.
As an alternative embodiment, the length of the horizontal portion 111 covers a plurality of heat exchange pipes of the high temperature economizer.
As an alternative embodiment, the high-temperature economizer 3 is arranged between the diversion chamber furnace wall 5 and the vertical gas-fired steam boiler 4; the ratio of the length of the horizontal portion 111 to the length of the vertical portion 112 is equal to the ratio of the width 51 to the length 52 of the oven wall of the turning chamber. The equal ratio is favorable for the refracted turbulent flue gas to return to the main flow area of the flue again.
The supporting piece 1 is arranged at the front side of the boiler and is back to the boiler wall (namely, the right-angle side of the right-angle bracket 11 is close to the boiler wall), the right-angle bracket 11 is welded and fixed on the coal economizer supporting cross beam, the gap between the right-angle bracket 11 and the boiler wall is the same as that of the coal economizer, so that the boiler is firm and reliable in a normal operation state, and does not rub against the boiler wall after being expanded;
as an alternative embodiment, the arc is an arc segment of an equiangular spiral, wherein the centre point of the equiangular spiral is located on the plane of the furnace front side furnace wall. The arc-shaped piece is an arc-shaped segment of an equiangular spiral, and the arc-shaped segment of the equiangular spiral and the turbulence pipe with the upward curved surface form a unified whole. The arc-shaped section is made into an equiangular spiral, which is beneficial to 'carrying out equiangular refraction and uniform distribution on the flue gas in different directions, and the flue gas flow field is more uniform'. The curved upward turbulence pipe is fixed on the equiangular spiral inclined edge of the support framework to form a curved grid, and the curved upward turbulence pipe can play a good role in scattering smoke in different directions.
As an alternative embodiment, the diameter of the turbulent flow pipe 21 is the same as that of the heat exchange pipe 32 of the high-temperature economizer. Further dredge the flue gas like this, ensure that quantitative flue gas rationally passes through, improve the heat transfer environment, ensure the homogeneity of the whole heat transfer of economizer bank of tubes.
As an alternative embodiment, the pipe diameter end of each turbulent flow pipe is welded on the arc-shaped surface of the arc-shaped part, and the other end of each turbulent flow pipe is fixed by adopting a sleeve in a sliding way. Under the thermal state working condition, the turbulent flow tube can freely expand axially, and the integrity of the turbulent flow device is enhanced.
As another typical implementation manner of the embodiment of the present application, a waste heat utilization system is provided, which includes a high-temperature economizer and the explosion-proof device;
the high-temperature economizer comprises a shell, wherein the lower part of the shell is provided with a flue gas inlet, the upper part of the shell is also provided with a flue gas outlet, a heat exchange tube is arranged in the shell, the shell is provided with a header, the header comprises an inlet header and an outlet header, and two ends of the heat exchange tube are respectively connected with the inlet header and the outlet header;
and the supporting piece of the explosion-proof device is fixed on the high-temperature economizer.
As an optional embodiment, the high-temperature economizer further comprises a supporting beam, a plurality of heat exchange tubes are connected with the supporting beam, and the supporting member of the explosion-proof device is fixed on the supporting beam of the high-temperature economizer.
In the embodiment, the explosion-proof device is welded and fixed on a supporting beam of the heat exchange tube of the high-temperature economizer through a supporting framework and is integrated with the economizer. The heat exchange pipe of the economizer is not contacted and rubbed, and external force damage is not caused.
As an alternative embodiment, the number of spoilers is the same as the number of support beams of the economizer.
As an optional implementation manner, the waste heat utilization system further includes: the vertical gas-steam boiler comprises a boiler body, a first flue and a second flue, wherein the boiler body is communicated with the flue gas inlet of the high-temperature economizer through the first flue, and the boiler body is communicated with the water pump through the second flue.
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
In addition, the appearances of the phrases "in" and "out" in this document are not necessarily all referring to the same embodiment, but are to be construed in all aspects.
Example one
As shown in fig. 1, in this embodiment, an explosion-proof device for a high-temperature economizer includes:
the support piece 1 is used for being fixed on a high-temperature economizer, the support piece 1 comprises a right-angle support 11 and an arc-shaped piece 12, and two ends of the right-angle support 11 are respectively connected with two ends of the arc-shaped piece 12; the right-angle bracket 11 includes a horizontal portion 111 and a vertical portion 112, and the horizontal portion 111 is disposed along a length direction of a header of the high-temperature economizer. The horizontal portion 111 has a length to cover the plurality of heat exchange pipes of the high temperature economizer. The high-temperature economizer 3 is arranged between the furnace wall 5 of the steering chamber and the vertical gas-fired steam boiler 4; the ratio of the length of the horizontal part 111 to the vertical part 112 is equal to the ratio of the wide side 51 to the long side 52 of the oven wall of the turning chamber. The right-angle side of the right-angle support 11 is close to the boiler wall, the right-angle support 11 is welded and fixed on the economizer supporting cross beam, the gap between the right-angle support 11 and the boiler wall is kept the same as that of the economizer, so that the boiler is firm and reliable in a normal operation state, and does not rub with the boiler wall after being expanded;
The support 1 is made of alloy steel, the arc-shaped part 12 is an equiangular spiral with an inclination of 12 degrees. 130t/h medium-temperature and medium-pressure gas-fired boiler, the turbulent flow tube 21 is made of 06Cr23Ni13, can resist 980 ℃ high temperature and has the thickness of 8 mm. The turbulent flow pipe 21 exchanges heat with the economizerThe tubes have the same diameter of
The different degrees of the temperature of 20 heat exchange tubes on the front side of the on-site measurement furnace exceed the design value, the bottom side length is 900mm, the height is 400mm, 3 groups are used, and the number of the groups is the same as that of the support beams of the economizer.
The technical scheme in the embodiment of the application at least comprises the following technical effects or advantages:
the explosion-proof device for the high-temperature economizer provided by the embodiment of the utility model can reduce the strength of the economizer intensively flushed by flue gas, and avoid the situations of excessive heat exchange at the front side of the high-temperature economizer, over-temperature of a heat exchange pipe and even overheating and pipe explosion.
Example two
The waste heat utilization system is characterized by comprising a high-temperature economizer and the explosion-proof device;
the high-temperature economizer 3 comprises a shell 31, a heat exchange tube 32 and a header 33, wherein the lower part of the shell 31 is provided with a flue gas inlet, the upper part of the shell 31 is provided with a flue gas outlet, the heat exchange tube 32 is arranged in the shell, the header 33 is arranged on the shell 32, the header 33 comprises an inlet header and an outlet header, and two ends of the heat exchange tube 32 are respectively connected with the inlet header and the outlet header;
And the supporting piece of the explosion-proof device is fixed on the high-temperature economizer supporting cross beam. The explosion-proof device of example 1 was used.
The horizontal distance between the adjacent turbulent flow tubes 21 in the overlooking direction is the same as the distance between the economizer heat exchange tubes, and L is 45 mm. 19 cross-section semi-arc turbulence pipes are arranged. The curved surface grid ensures that quantitative flue gas uniformly passes through while scattering and dredging turbulent flue gas, and reasonable heat exchange of the heat exchange tube of the economizer on the front side of the furnace is realized.
The technical scheme in the embodiment of the application at least comprises the following technical effects or advantages:
according to the waste heat utilization system provided by the embodiment of the utility model, the temperature difference between the heat exchange tube at the front side of the furnace and the heat exchange tube at the rear side of the furnace is controlled within 5 ℃, and the integral heat exchange uniformity of the tube bundle of the high-temperature economizer is better. The unit operates stably, and the boiler can operate stably for an overhaul period. Effectively avoids the power generation benefit loss and the coal gas diffusion caused by the fault shutdown. The environmental pollution is reduced, and the equipment maintenance frequency and the labor intensity of personnel are reduced.
EXAMPLE III
A waste heat utilization system comprises a high-temperature coal economizer 3, an explosion-proof device and a vertical gas-steam boiler 4;
the high-temperature economizer comprises a shell, a heat exchange tube and a header, wherein the lower part of the shell comprises a flue gas inlet, the upper part of the shell comprises a flue gas outlet, the heat exchange tube is arranged in the shell, the header is arranged on the shell and comprises an inlet header and an outlet header, and two ends of the heat exchange tube are respectively connected with the inlet header and the outlet header;
And the supporting piece of the explosion-proof device is fixed on the high-temperature economizer.
The vertical gas-steam boiler 4 comprises a boiler body, a first flue and a second flue, wherein the boiler body is communicated with the flue gas inlet of the high-temperature economizer through the first flue, and the boiler body is communicated with the water pump through the second flue.
The technical scheme in the embodiment of the application at least comprises the following technical effects or advantages:
the waste heat utilization system provided by the embodiment of the utility model solves the problems of local overheating and tube explosion of a heat exchange tube caused by centralized scouring of turbulent smoke on the heat exchange tube bundle at the front side of the high-temperature economizer furnace due to the steering chamber, and effectively ensures stable operation of a boiler system.
While preferred embodiments of the present invention have been described, additional variations and modifications of those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the utility model. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to encompass such modifications and variations.
Claims (10)
1. An explosion-proof device for a high-temperature coal economizer is characterized by comprising:
the support piece is used for being fixed on the high-temperature economizer and comprises a right-angle support and an arc-shaped piece, and two ends of the right-angle support are respectively connected with two ends of the arc-shaped piece;
the turbulence piece comprises a plurality of turbulence pipes, and is a plurality of the turbulence pipes are arranged along the arc-shaped surface of the arc-shaped piece, each turbulence pipe is provided with a pipe diameter end facing a header of the high-temperature economizer, and is a plurality of the projection positions of the turbulence pipes on the horizontal plane correspond to a plurality of heat exchange pipes of the high-temperature economizer one by one.
2. A waste heat utilization system, comprising:
the high-temperature economizer comprises a shell, a heat exchange tube and a header, wherein the lower part of the shell comprises a flue gas inlet, the upper part of the shell comprises a flue gas outlet, the heat exchange tube is arranged in the shell, the header is arranged on the shell and comprises an inlet header and an outlet header, and two ends of the heat exchange tube are respectively connected with the inlet header and the outlet header;
the explosion-proof device for a high-temperature economizer of claim 1, wherein the support member of the explosion-proof device for a high-temperature economizer is fixed to the high-temperature economizer.
3. The waste heat utilization system according to claim 2, wherein the right-angle bracket includes a horizontal portion and a vertical portion, the horizontal portion being disposed along a length direction of the header of the high-temperature economizer.
4. The waste heat utilization system according to claim 3, wherein the length of the horizontal portion covers a plurality of the heat exchange pipes of the high-temperature economizer.
5. The waste heat utilization system according to claim 3, wherein the high temperature economizer is provided between a turn chamber wall and a vertical gas steam boiler, and a ratio of a length of the horizontal portion to a length of the vertical portion is equal to a ratio of a width to a length of a long side of the turn chamber wall.
6. The system of claim 5, wherein the arc member is an arc segment of an equiangular spiral, and the center point of the equiangular spiral is located on a plane of a front side wall of the vertical gas steam boiler.
7. The waste heat utilization system according to claim 2, wherein a pipe diameter of the turbulent flow pipe is the same as that of the heat exchange pipe of the high-temperature economizer.
8. The waste heat utilization system according to claim 2, wherein the high-temperature economizer further comprises a supporting cross beam, the plurality of heat exchange tubes are connected with the supporting cross beam, and the supporting member of the explosion-proof device is fixed on the supporting cross beam of the high-temperature economizer.
9. The waste heat utilization system as claimed in claim 8, wherein the number of the spoilers is the same as the number of the supporting beams of the economizer.
10. The waste heat utilization system according to claim 2, further comprising: the vertical gas-steam boiler comprises a boiler body, a first flue and a second flue, wherein the boiler body is communicated with the flue gas inlet of the high-temperature economizer through the first flue, and the boiler body is communicated with the water pump through the second flue.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116518362A (en) * | 2023-04-17 | 2023-08-01 | 福建省福能龙安热电有限公司 | Low-temperature coal economizer for boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116518362A (en) * | 2023-04-17 | 2023-08-01 | 福建省福能龙安热电有限公司 | Low-temperature coal economizer for boiler |
| CN116518362B (en) * | 2023-04-17 | 2024-01-26 | 福建省福能龙安热电有限公司 | Low-temperature coal economizer for boiler |
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