CN217900489U

CN217900489U - High-strength tube plate and industrial furnace with same

Info

Publication number: CN217900489U
Application number: CN202221225782.5U
Authority: CN
Inventors: 陈孙艺
Original assignee: Challenge Petrochemical Machinery Corp
Current assignee: Challenge Petrochemical Machinery Corp
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-11-25
Anticipated expiration: 2032-05-19

Abstract

The utility model relates to a petrochemical industry industrial furnace technical field, concretely relates to high strength tube sheet and have industrial furnace of this tube sheet, including furnace wall, tip tube sheet, journal stirrup, middle tube sheet and coil pipe, middle tube sheet is a high strength tube sheet, including upright panel, diaphragm, deckle board and stabilizer blade, upright panel is opened has a plurality of supported holes that supply peripheral boiler tube to pass, the lateral wall of each upright panel is equipped with transverse arrangement's polylith the diaphragm, the diaphragm staggers with the supported hole on the upright panel and arranges; the frame plate is surrounded on the periphery of the vertical breadth plate, and the support legs are fixed on the outer side of the frame plate; the thickness of the lower section of the vertical amplitude plate is larger than that of the upper section, the lower section of the vertical amplitude plate is thicker, and the transverse plate or the frame plate at the lower part of the tube plate is wider, so that the lower part of the vertical amplitude plate is fully adaptive to the action of bearing larger tensile stress, and the service life is prolonged.

Description

High-strength tube plate and industrial furnace with same

Technical Field

The utility model relates to a petrochemical industry furnace technical field especially relates to equipment that petroleum refining, petrochemical, coal chemical industry and other chemical industry process carry out the heat transfer to fluid medium, concretely relates to high strength tube sheet and have industrial furnace of this tube sheet.

Background

(1) Structural design and function of traditional heating furnace

The heating furnace is the heart of oil refining and petrochemical equipment, and the tubular heating furnace is used for heating the medium (oil or gas) in the tube to the temperature required by the process.

The four sides of the furnace body are enclosed into a hearth by tall furnace walls, the furnace walls are made of I-shaped steel and other shaped steel frames on which steel plates are paved and welded, heat-insulating nails are distributed and welded on the steel plates, and heat-insulating and wear-resisting materials are poured between the heat-insulating nails. The tube plates are supported by the support lugs arranged on the furnace walls on the two sides, the furnace tubes penetrate through the tube plates with holes and are supported by the tube plates, oil materials to be heated flow through the furnace tubes, high-temperature smoke or hot air flows through the furnace tubes from bottom to top vertically (or from left to right horizontally or from right to left) in the hearth, and heat is transferred to the oil materials in the tubes through the tube walls.

Generally, in order to fully balance and utilize various heat sources, a heating furnace generally comprises a bottom radiation section, an upper convection section, a top chimney and peripheral auxiliary facilities, wherein the convection section is formed by stacking a plurality of groups of modules with the same structure. In order to save space inside the furnace and reduce the overall height of the heating land, the convection section modules are typically rectangular parallelepiped in configuration. The distance between the tube plate support lugs on the furnace walls on two sides is a span, n tube plates with the thickness of B are arranged, the span B is basically equal to the distance between the furnace walls, and in the structural design and strength check process, the tube plates are generally simplified into simple support beams with the span and the thickness unchanged, the equivalent height of h and the bearing of the uniform wiring load G/B, so that the tensile stress of the tube tubes and the weight of media in the tubes at the bottoms of the tube plates is the maximum and is in direct proportion to the span B.

(2) Tube plate of traditional heating furnace and problems thereof

With the long-term development of social economy, on one hand, the deterioration of the extracted crude oil is more and more serious, the oil refining and chemical engineering technology develops towards high-temperature high-pressure deep processing, and the temperature experienced by a tube plate is higher and higher from a heating function to a reaction function of an industrial furnace. On the other hand, the energy demand is increased rapidly, industrial furnaces are developed in large scale, national development committee specially issues a strict energy efficiency constraint promotion energy-saving and carbon reduction action scheme (2021-2025) in key industries of petrochemical industry aiming at the field of petrochemical industry, atmospheric and vacuum pressure of less than 1000 ten thousand tons/year is strictly forbidden to be newly built, ethylene is prepared by cracking naphtha of less than 80 ten thousand tons/year, and similar requirements are also provided for the lower limit of capacity of other petrochemical devices. The large-scale capacity requires that industrial furnaces are larger and larger, a large-width tube plate is required for supporting a furnace tube in a large-span hearth, and the whole large-width tube plate has the stress characteristics in the width direction that the upper part is under the action of compressive stress and the lower part is under the action of tensile stress, and the tube plate designed according to the traditional structure cannot meet the requirement of economic construction. In 2015, "advanced development of large-scale heating furnace promoted modular manufacturing technology progress [ J ] petrochemical plant technology, 2015, 36 (1): 28-33, reporting the performance of cast tube plates with the width of 4.6m, the height of 2.0m and the height of transverse arc plates at two sides of 0.25m respectively in China.

Therefore, the improved pipe plate structure can improve the stress mode, improve the casting condition of the casting process, improve the economic benefit of the industrial furnace and have strong practical significance.

Disclosure of Invention

To the technical problem that exists in the prior art, the utility model provides a high strength tube sheet and have industrial furnace of this tube sheet.

In order to achieve the above object, the utility model provides a following technical scheme:

the high-strength tube plate comprises a vertical web, transverse plates, frame plates and support legs, wherein the vertical web is provided with a plurality of support holes for peripheral furnace tubes to pass through, the side wall of each vertical web is provided with a plurality of transverse plates which are transversely arranged, and the transverse plates and the support holes on the vertical web are arranged in a staggered manner; the frame plate is surrounded on the periphery of the vertical breadth plate, and the support legs are fixed on the outer side of the frame plate; the thickness of the lower section of the vertical web is larger than that of the upper section.

Preferably, the thickness of the vertical web is gradually increased from top to bottom.

Preferably, the widths of the frame plate and the transverse plate are gradually increased from top to bottom.

Preferably, the width of the transverse plate at the lower section of the vertical web is larger than the width of the transverse plate at the upper section of the vertical web.

Preferably, the width of the frame plate at the lower section of the standing web is larger than the width of the frame plate at the upper section of the standing web.

As a preferred scheme, the upper section of the frame plate is trapezoidal, and the lower section of the frame plate is rectangular; or the upper section of the frame plate is rectangular and the lower section is trapezoidal.

Preferably, the thickness of the cross-bar at the lower section of the vertical web is greater than the thickness of the cross-bar at the upper section of the vertical web.

Preferably, the thickness of the frame plate at the lower section of the standing web is larger than the thickness at the upper section of the standing web.

As the preferred scheme, the vertical breadth plate, the frame plate and the transverse plate are of a common integrated casting structure; or the vertical amplitude plate, the frame plate and the transverse plate are formed by assembling and welding steel plates.

The industrial furnace, including furnace wall, tip tube sheet, journal stirrup, middle tube sheet and coil pipe, the both ends at the furnace wall are fixed to the tip tube sheet, and the journal stirrup is fixed at the top of furnace wall, and middle tube sheet distributes along furnace wall is inside, and the coil pipe includes many boiler tubes and a plurality of elbows, and the boiler tube passes the brace hole of middle tube sheet and tip tube sheet, and the elbow communicates many boiler tubes, characterized by: the middle tube plate is the high-strength tube plate.

The utility model has the advantages that:

compared with the prior art, the high-strength tube plate and the industrial furnace with the same of the utility model are fully adapted to the characteristic that the lower part of the tube plate bears larger tensile stress in the width direction, and need larger structural strength; and the upper part of the tube plate bears the action of compressive stress in the width direction, and only small structural strength is required. On the other hand, in the plurality of layers of furnace tubes supported by the tube holes on the tube plates, high-temperature flue gas flows upwards from the lower part of the industrial furnace through the furnace tubes of each layer, the temperature of the flue gas is reduced after heat exchange layer by layer, the temperatures of the lower part of the tube plates and the furnace tubes of the tube holes positioned at the lower part of the tube plates are higher, the displacement of the expansion extension of the furnace tubes under heating is larger, and the thrust applied to the tube plates through the friction between the furnace tubes and the tube holes is also larger, so that the thicker thickness of the lower sections of the vertical amplitude plates of the tube plates can make up the requirement that the vertical amplitude plates bear the larger thrust. On the other hand, the strength property of the metal material is reduced with the increase of the temperature, and the reduction of the strength property of the lower part of the tube plate at the higher temperature relative to the upper part of the tube plate is also required to be improved from the viewpoint of structural innovation. The two ends of the high-strength tube plate are freely supported on the support lugs in the furnace walls at the two sides, the tube plate can be equivalent to a simple beam, the length of the beam is the width of the tube plate, the beam is mainly subjected to approximately uniform gravity, the gravity comes from the tube coil supported by the tube plate holes and the internal medium of the tube coil, and the upper side surface of the beam is also subjected to certain thermal expansion thrust of the tube. The high-strength tube plate structure is a reasonable structure for supporting the pressure applied from the top to the bottom, and compared with the tube plate structure with the same width from top to bottom, the bearing capacity of the tube plate can be greatly improved, so that the lower structure of the tube plate is wider and/or thicker, the effects of bearing larger vertical pressure, side thrust and higher temperature can be compensated, and the operation period of the industrial furnace is prolonged.

Drawings

Fig. 1 is a schematic structural view of a group of modules of an industrial furnace in an embodiment.

Fig. 2 is a schematic diagram of a high-strength tube sheet in the embodiment.

Fig. 3 is a schematic structural view of a frame plate having a trapezoid shape with a narrow top and a wide bottom in an embodiment.

Fig. 4 is a schematic structural diagram in which the upper section of the frame plate in the embodiment is trapezoidal and the lower section is rectangular.

Fig. 5 is a schematic structural diagram in which the upper section of the frame plate in the embodiment is rectangular and the lower section is trapezoidal.

Fig. 6 isbase:Sub>A schematic structural view of the embodiment in which the thickness of the vertical webs gradually increases from top to bottom and the widths of the plurality of transverse plates gradually increase from top to bottom, and isbase:Sub>A cross-sectional view of fig. 2 withbase:Sub>A-base:Sub>A asbase:Sub>A cross-section.

Detailed Description

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

The industrial furnace of the embodiment, as shown in fig. 1 to 6, includes a furnace wall 1, end tube plates 3, support lugs, a middle tube plate 5 and a coil 2, wherein the end tube plates 3 are fixed at two ends of the furnace wall, the support lugs are fixed at the top of the furnace wall 1, the middle tube plate 5 is distributed along the inside of the furnace wall, the coil 2 includes a plurality of furnace tubes 4 and a plurality of elbows 6, the furnace tubes 4 pass through support holes of the middle tube plates 5 and the end tube plates 3, and the elbows 6 communicate the plurality of furnace tubes. The heated fluid flows into each furnace tube uniformly through one header, flows back and forth for several times in the furnace tube, is heated by high-temperature flue gas outside the tube, and then is concentrated into the other header and flows out of the furnace.

The above is an industrial furnace base structure, and as an improvement, the structure comprises the following components:

the middle tube plate 5 is a high-strength tube plate and comprises a vertical web 7, transverse plates 9, frame plates 10 and support legs 11, wherein the vertical web 7 is provided with a plurality of support holes 8 for peripheral furnace tubes to pass through, the side wall of each vertical web 7 is provided with a plurality of transverse plates 9 which are transversely arranged, and the transverse plates 9 and the support holes 8 on the vertical web 7 are arranged in a staggered manner. The frame plate 10 is surrounded on the periphery of the vertical web 7, and the legs 11 are fixed on the outer side of the frame plate 10. The thickness of the lower section of the vertical web 7 is larger than that of the upper section, wherein the upper section and the lower section are not strictly distinguished, and the lower section can occupy 20-60% of the height of the whole vertical web 7. Further, the width of the cross board at the lower section of the standing web 7 is larger than the width of the cross board at the upper section of the standing web 7, and the width is a range in which the cross board protrudes from the standing web. The width of the frame plate 10 at the lower section of the vertical breadth plate 7 is larger than that at the upper section of the vertical breadth plate 7, and the frame plate width is the same as the width direction of the transverse board, and is the width protruding from the vertical breadth plate.

Compared with the prior art, the scheme is fully suitable for the characteristic that the lower part of the tube plate bears larger tensile stress in the width direction (vertical to the transverse direction of the furnace tube), and needs larger structural strength; the upper part of the tube plate bears the action of compressive stress in the width direction, and only small structural strength is required. On the other hand, in the plurality of layers of furnace tubes supported by the tube holes on the tube plate, the temperature of the furnace tubes positioned in the tube holes at the lower part of the tube plate is higher, the displacement of the furnace tubes subjected to thermal expansion is larger, and the thrust applied to the tube plate through the friction between the furnace tubes and the tube holes is also larger, so that the thicker thickness of the lower section of the vertical amplitude plate of the tube plate can make up the requirement that the lower section of the vertical amplitude plate of the tube plate can bear larger thrust. Two ends of a high-strength tube plate are freely supported on support lugs in furnace walls on two sides, the tube plate can be equivalent to a simple beam, the length of the beam is the width of the tube plate, the beam is mainly subjected to approximately uniform gravity action, the gravity comes from a furnace tube coil supported by a tube plate hole and an internal medium of the furnace tube coil, and the upper side surface of the beam is also subjected to certain furnace tube thermal expansion thrust. The high-strength tube plate structure is a reasonable structure for supporting the downward pressure from the top, and compared with a tube plate structure with the same width from top to bottom, the high-strength tube plate structure can greatly improve the bearing capacity of the tube plate and prolong the operation period of the industrial furnace.

Referring mainly to fig. 2 and 6, the thickness of the transverse plate 92 located at the lower section of the vertical web 7 is greater than the thickness of the transverse plate 91 located at the upper section of the vertical web 7, and the thickness of the frame plate 10 located at the lower section of the vertical web 7 is greater than the thickness located at the upper section of the vertical web 7. The thickness of the vertical breadth plate 7 is gradually increased from top to bottom, the widths of the frame plate 10 and the transverse plate 9 are also gradually increased from top to bottom, the frame plate 10 is gradually increased, and mainly refers to fig. 3, and the frame plate is in a trapezoid shape with a wide top and a narrow bottom.

In another embodiment, the frame plate 10 may be modified to have a trapezoidal upper section 101 and a rectangular lower section 102 as shown in fig. 4; or, as shown in fig. 5, the upper section 103 of the frame plate is rectangular and the lower section 104 is trapezoidal.

In practice, the vertical breadth plate 7, the frame plate 10 and the transverse board 9 are of a common integrated casting structure; or the vertical breadth plate 7, the frame plate 10 and the transverse board 9 are formed by assembling and welding steel plates.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connection mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt prior art, and conventional model, including circuit connection adopts conventional connection mode among the prior art, does not detailed here again.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high strength tube sheet, characterized by: the furnace tube support comprises a vertical breadth plate, transverse plates, frame plates and support legs, wherein the vertical breadth plate is provided with a plurality of support holes for the peripheral furnace tube to pass through, the side wall of each vertical breadth plate is provided with a plurality of transverse plates which are transversely arranged, and the transverse plates and the support holes on the vertical breadth plate are arranged in a staggered manner; the frame plate is surrounded on the periphery of the vertical breadth plate, and the support legs are fixed on the outer side of the frame plate; the thickness of the lower section of the vertical web is larger than that of the upper section.

2. The high strength tube sheet of claim 1, wherein: the thickness of the vertical plate is gradually increased from top to bottom.

3. A high strength tube sheet as claimed in claim 1 or 2, wherein: the width of frame plate and diaphragm increases the setting from top to bottom gradually.

4. A high strength tube sheet as set forth in claim 1, wherein: the width of the transverse plate at the lower section of the vertical web is larger than that of the transverse plate at the upper section of the vertical web.

5. A high strength tube sheet as set forth in claim 1, wherein: the width of the frame plate at the lower section of the vertical web is larger than that at the upper section of the vertical web.

6. The high strength tube sheet of claim 5, wherein: the upper section of the frame plate is trapezoidal, and the lower section of the frame plate is rectangular; or the upper section of the frame plate is rectangular and the lower section is trapezoidal.

7. A high strength tube sheet as set forth in claim 1, wherein: the thickness of the cross plate positioned at the lower section of the vertical web plate is larger than that of the cross plate positioned at the upper section of the vertical web plate.

8. The high strength tube sheet of claim 1, wherein: the thickness of the frame plate at the lower section of the vertical web is larger than that at the upper section of the vertical web.

9. The high strength tube sheet of claim 1, wherein: the vertical breadth plate, the frame plate and the transverse plate are of a common integrated casting structure; or the vertical amplitude plate, the frame plate and the transverse plate are formed by assembling and welding steel plates.

10. Industrial furnace, including furnace wall, tip tube sheet, journal stirrup, middle tube sheet and coil pipe, the both ends at the furnace wall are fixed to the tip tube sheet, and the journal stirrup is fixed at the top of furnace wall, and middle tube sheet distributes along furnace wall is inside, and the coil pipe includes many boiler tubes and a plurality of elbows, and the boiler tube passes the supported hole of middle tube sheet and tip tube sheet, and the elbow will many boiler tubes communicate characterized by: the intermediate tubesheet is a high strength tubesheet of any one of claims 1 through 9.