A flue structure supporting economizer

Abstract

The present invention discloses a flue structure supporting an economizer, comprising a furnace water-cooled wall rear wall, flue walls on three sides, and a flue top, wherein each flue wall comprises several inner wall steel plates, several steel sections, and an outer wall insulation layer; a header is provided on the upper side of each flue wall, the bottom of each header being fixedly connected to the inner wall steel plate below via a pre-connected steel plate, and an arc-shaped plate being fixedly connected to the lower portion of the header, each arc-shaped plate being fixedly connected to the upper ends of several longitudinal ribs, and the inner sides of the longitudinal ribs being fixedly connected to the inner wall steel plates; several horizontally arranged support beams are provided in the flue, each support beam having its ends fixedly connected to the inner wall steel plates on opposite sides via steel plates, and adjacent support beams are fixedly connected as well as the inner wall steel plate of the flue wall on the other side; and an economizer is placed on each support beam. The present invention is not only simple in structure and highly operable, but also highly reliable, and does not require openings in the flue wall, thereby improving sealing.

Description

Technical Field

[0001] The invention relates to a flue structure supporting an economizer. Background Art

[0002] With the widespread implementation of environmental protection policies, boilers in power generation projects are required to undergo denitration or be prepared for denitration. In high-parameter boiler projects, during high-load operation, to ensure that the flue gas temperature at the inlet of the denitration equipment is not too high, an economizer must be installed in the flue before denitration to reduce the flue gas temperature. At this time, it is necessary to consider how to support the economizer. Currently, economizers are typically installed in the flue using hanging pipes. This structure is not only complex and costly, but also prone to falling off after long-term use due to the weight and thermal expansion of the economizer, resulting in poor reliability. Furthermore, holes must be opened in the flue wall, which can easily cause leaks and affect the sealing of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and provide a flue structure for supporting an economizer, which is not only simple in structure and highly operable, but also reliable and does not require holes to be opened on the flue wall to improve sealing.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a flue structure supporting an economizer, comprising a rear wall of a furnace water-cooled wall, flue walls on three sides and a flue top, wherein the flue wall on each side comprises several inner wall steel plates, several steel sections and an external insulation layer; the characteristics are as follows: a header is provided on the upper side of the flue wall on each side, the bottom of each header is fixedly connected to the inner wall steel plate on the lower side through a pre-connected steel plate, an arc plate is fixedly connected to the lower part of the header on the outer side of the pre-connected steel plate, each arc plate is fixedly connected to the upper end of several longitudinal ribs, and the inner sides of the longitudinal ribs are fixedly connected to the inner wall steel plate; several horizontally arranged support bars are provided in the flue Beams, both ends of each supporting beam are fixedly connected to the inner wall steel plates on the opposite sides through steel plates, and the adjacent supporting beams and the inner wall steel plates of the flue wall on the other side are fixedly connected; the tube panel of the rear wall of the furnace water-cooled wall is fixedly connected with a group of upper ear plates and lower ear plates, and the upper ear plates and lower ear plates are both provided with blocks. Several horizontal supporting tubes are arranged between the tube panel and the supporting beams adjacent to the tube panel, one end of the supporting tubes is fixedly connected to the supporting beam, and the other end of the supporting tubes is fixedly connected to their respective supporting plates, and the support plates are placed between the corresponding groups of upper ear plates and lower ear plates; the economizer is placed on each supporting beam.

[0005] The present invention uses the rear wall of the furnace water-cooled wall, the flue walls on three sides and the flue top to form a flue, and the economizer is placed on each support beam. The load of the economizer is transmitted to the inner wall steel plate and tube screen of each side of the flue wall through the support beam. The inner wall steel plate then transmits the load to the three headers through the longitudinal ribs. The device is not only simple in structure and highly operable, but also the support beams are connected to each other, the economizer is supported by the support beams, and the installation is stable. The three sides of the entire support structure are fixedly connected to the inner wall steel plate, and the support plates on the other side are placed between the corresponding groups of upper and lower ear plates, which can ensure free expansion and prevent failure caused by deformation. It has good reliability and does not require holes to be opened in the flue wall, thereby improving sealing.

[0006] As a further improvement of the present invention, the support beams are all box beams; they have high strength and are convenient for fastening to the inner wall steel plates on both sides;

[0007] As a further improvement of the present invention, the longitudinal ribs are all longitudinal ribs with a T-shaped cross section; this can improve the bearing strength and also facilitate the connection with the curved plate;

[0008] As a further improvement of the present invention, the adjacent support beams and the inner wall steel plate of the flue wall on the other side are fixedly connected to the adjacent support beams by a plurality of connecting pipes and plug-in plates at both ends of each connecting pipe; that is, both ends of the connecting pipe are fixedly connected with plug-in plates, and the plug-in plates on both sides are further fixedly connected to the support beams or the inner wall steel plates, which is convenient for operation;

[0009] As a further improvement of the present invention, the inner wall steel plates between the two adjacent steel sections on each side of the flue wall are further welded and fixedly connected by flat steel bars; this can improve the wall strength and sealing performance;

[0010] As a further improvement of the present invention, the inner wall steel plates on the opposite sides are further connected to the tube panels of the rear wall of the furnace water-cooled wall through a plurality of explosion plates; this not only increases the strength of the flue, but also the explosion plates can absorb a certain amount of deformation to prevent failure caused by deformation;

[0011] As a further improvement of the present invention, the inner wall steel plates of the three side flue walls are further connected to their respective headers through several explosion plates; this not only increases the flue strength but also prevents failure caused by deformation;

[0012] As a further improvement of the present invention, each support beam is fixed with a pipe clamp for fixing the economizer; this can fix the economizer and improve reliability;

[0013] In summary, the present invention is not only simple in structure and highly operable, but also highly reliable, and does not require opening holes in the flue wall to improve sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic half-sectional structural diagram of an embodiment of the present invention after removing the outer insulation layer.

[0015] Figure 2 for Figure 1 Right view of .

[0016] Figure 3 for Figure 2 AA cross-sectional view.

[0017] Figure 4 for Figure 1 Enlarged view of point I.

[0018] Figure 5 for Figure 2 SS enlarged cross-sectional view.

[0019] Figure 6 for Figure 3 BB cross-sectional view.

[0020] Figure 7 for Figure 3 CC enlarged cross-sectional view.

[0021] Figure 8 for Figure 2 MM enlarged cross-sectional view.

[0022] Figure 9 for Figure 2 NN enlarged cross-sectional view.

[0023] Figure 10 for Figure 6 Enlarged view of point II. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and examples.

[0025] like Figures 1 to 10As shown, a flue structure supporting an economizer in this embodiment includes a furnace water-cooled wall rear wall 1, flue walls 2, 3, and 4 on three sides, and a flue top 5. Each flue wall includes several inner wall steel plates 7, several steel sections 9 welded and fixedly connected to the inner wall steel plates 7, and an external insulation layer 8. The inner wall steel plates 7 between two adjacent steel sections 9 on each flue wall are further welded and fixedly connected by flat steel bars 10. The inner wall steel plates 7 on the opposite flue walls 2 and 4 are further welded and fixedly connected to the tube panels 6 of the furnace water-cooled wall rear wall 1 by several explosion plates 12. A header 13 is provided on the upper side of the flue wall on each side. The bottom of each header 13 is welded to the inner wall steel plate 7 on the lower side through a pre-connected steel plate 14. The lower part of the header 13 outside the pre-connected steel plate 14 is welded to an arc plate 15. Each arc plate 15 is welded to the upper end of several corresponding longitudinal ribs 16. The cross section of the longitudinal ribs 16 is T-shaped, and the inner side of the longitudinal ribs 16 is welded to the inner wall steel plate 7; the inner wall steel plates 7 of the three side flue walls 2, 3, and 4 are welded to their respective headers 13 through several explosion plates 17; there are four horizontally arranged box beam structure support beams 18 in the flue, each supporting beam 18 has a plurality of blasting plates 17, and the inner wall steel plates 7 are welded to the inner wall steel plates 7. Both ends of the beam 18 are welded and fixedly connected to the inner wall steel plates 7 of the flue walls 2 and 4 on the opposite sides through several steel plates 19. The adjacent support beams 18 and the inner wall steel plate 7 of the flue wall 3 on the other side and the adjacent support beam 18 are fixedly connected through several connecting pipes 20 and the plug-in plates 21 at both ends of each connecting pipe 20, that is, both ends of the connecting pipe 20 are installed and welded to the plug-in plates 21 through slots, and the plug-in plates 21 on both sides are then welded and fixedly connected to the support beams 18 or the inner wall steel plates 7; the tube panel 6 of the rear wall 1 of the furnace water-cooled wall is welded and fixedly connected with a group of upper ear plates 22 and lower ear plates 23, and the upper ear plates 22 and the lower ear plates are fixedly connected. Each plate 23 is provided with a stopper 24. Several horizontal support tubes 25 are provided between the tube panel 6 and the support beam 18 adjacent to the tube panel. One end of the support tube 25 is fixedly connected to the support beam 18 through an insert plate, and the other end of the support tube 25 is fixedly connected to the respective support plates 26 through an insert plate. The support plates 26 are placed between the corresponding groups of upper ear plates 22 and lower ear plates 23. The support plates 26 are located horizontally between the tube panel 6 and the stoppers 24 of the upper ear plates 22 and the lower ear plates 23; an economizer 27 is placed on each support beam 18, and a pipe clamp 28 for fixing the economizer 27 is welded and fixed to each support beam 18.

[0026] The present invention uses the furnace water-cooled wall rear wall 1, the flue walls 2, 3, 4 on three sides, and the flue top 5 to enclose a flue. In this embodiment, the lower half of the three-header box 13 is placed in the external insulation layer of the flue top 5, and the upper half is placed outside the external insulation layer of the flue top 5. Depending on different working conditions, the three-header box 13 can also be placed inside the external insulation layer of the flue top 5.

[0027] The economizer 27 is placed on each support beam 18. The load of the economizer 18 is transmitted to the inner wall steel plate 7 and the tube screen 6 on each side of the flue wall through the support beam 18. The inner wall steel plate 7 then transmits the load to the three collecting boxes 13 through the longitudinal ribs 16 and the arc plate 15. The three sides of the entire support structure are fixedly connected to the inner wall steel plate 7. This device is not only simple in structure and highly operable, but also has strong operability. The support beams 18 are connected to each other through the connecting pipe 20 and the plug plate 21. The economizer 27 is supported by the support beams 18 and is firmly installed. The support plates 26 on the other side of the support structure are placed between the corresponding groups of upper ear plates 22 and lower ear plates 23 to ensure free expansion and prevent failure caused by deformation. It has good reliability and does not require holes in the flue wall to improve sealing. The flat steel bars 10 can improve wall strength and sealing. The explosion plates 12 and 17 not only increase the flue strength, but also absorb a certain amount of deformation to prevent failure caused by deformation, thereby ensuring long-term normal operation of the equipment.

[0028] This embodiment is used to explain and illustrate this patent, but is not limited to the above-mentioned implementation mode. For example, the longitudinal ribs can also adopt other cross-sectional shapes, and the structure of the support beam can also be diverse, all of which fall within the scope of protection of this patent.

Claims

1. A flue structure supporting an economizer, comprising a furnace water-cooled wall rear wall, three flue walls, and a flue top, wherein each flue wall comprises several inner wall steel plates, several steel sections, and an outer insulation layer; characterized in that: There is a header on the upper side of the flue wall on each side. The bottom of each header is fixedly connected to the inner wall steel plate on the lower side through a pre-connected steel plate. The lower part of the header outside the pre-connected steel plate is fixedly connected with an arc plate. Each arc plate is fixedly connected to the upper end of several longitudinal ribs. The inner side of the longitudinal ribs is fixedly connected to the inner wall steel plate. There are several horizontally arranged support beams in the flue. The two ends of each support beam are fixedly connected to the inner wall steel plates on the opposite sides through steel plates. There is a gap between two adjacent support beams and on the other side. The inner wall steel plates of the flue wall are fixedly connected to the adjacent support beams; the tube panel on the rear wall of the furnace water-cooled wall is fixedly connected with a group of upper ear plates and lower ear plates, and both the upper ear plates and the lower ear plates are provided with blocks. Several horizontal support tubes are provided between the tube panel and the support beams adjacent to the tube panel, and one end of the support tubes is fixedly connected to the support beam, and the other end of the support tubes is fixedly connected to their respective support plates, and the support plates are placed between the corresponding groups of upper ear plates and lower ear plates; the economizer is placed on each support beam.

2. The flue structure supporting an economizer according to claim 1, characterized in that: The support beams are all box beams.

3. A flue structure supporting an economizer according to claim 1 or 2, characterized in that: The longitudinal ribs are all longitudinal ribs with T-shaped cross sections.

4. The flue structure supporting an economizer according to claim 3, characterized in that: The adjacent two supporting beams and the inner wall steel plate of the flue wall on the other side and the adjacent supporting beam are fixedly connected by a plurality of connecting pipes and plug plates at both ends of each connecting pipe.

5. The flue structure supporting an economizer according to claim 4, characterized in that: The inner wall steel plates between two adjacent steel sections on each side of the flue wall are also welded and fixedly connected by flat steel bars.

6. The flue structure supporting an economizer according to claim 5, characterized in that: The inner wall steel plates on the opposite sides are also fixedly connected to the tube panels on the rear wall of the furnace water-cooled wall through several explosion plates.

7. The flue structure supporting an economizer according to claim 6, characterized in that: The inner wall steel plates of the three side flue walls are also fixedly connected to their respective headers through several explosion plates.

8. The flue structure supporting an economizer according to claim 7, characterized in that: Each of the support beams is fixedly connected with a pipe clamp for fixing the economizer.

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