CN214223049U

CN214223049U - Three-sleeve synthetic waste heat boiler

Info

Publication number: CN214223049U
Application number: CN202023310031.7U
Authority: CN
Inventors: 诸宏发; 柯栋; 武国龙
Original assignee: Nanjing Tianjie Santa Energy Conservation Equipment Co ltd
Current assignee: Nanjing Tianjie Santa Energy Conservation Equipment Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-17
Anticipated expiration: 2030-12-30

Abstract

The utility model relates to a three-sleeve synthetic waste heat boiler, which comprises a cylinder body, an outer pipe box, an inner pipe box and three sleeves; the three sleeves comprise an inner sleeve, a dead gas layer sleeve and an outer sleeve, the inlet end of the inner sleeve is fixed on the thin tube plate of the inner tube box and is communicated with the inner tube box, the outlet end of the outer sleeve is fixed on the thick tube plate of the outer tube box and is communicated with the outer tube box, the outer tube box is provided with a gas inlet and a gas outlet, and the gas inlet is communicated with the inner tube box; the vibration damping device is characterized in that a fluctuation damping support is arranged at the other end, corresponding to the outer pipe box, of the bottom of the cylinder body. The utility model discloses a set up undulant buffering support, the thermal energy extension of effective compensation synthetic tower bottom to synthetic waste heat boiler pipe case to avoid the thermal energy extension to cause the welding seam stress that the waste heat boiler is taken over and is connected with pipe case and casing too big, lead to leakage accidents such as fracture to appear in the welding seam.

Description

Three-sleeve synthetic waste heat boiler

Technical Field

The utility model relates to a chemical industry equipment technical field, concretely relates to synthetic exhaust-heat boiler of three sleeves.

Background

The three-sleeve synthesis waste heat boiler is a key device in an ammonia synthesis system, can emit a large amount of heat in the synthesis process, and can heat water to recover high-quality saturated steam through the heat. The three-sleeve synthesis waste heat boiler operates under severe processes of high temperature, high pressure, hydrogen embrittlement, gas erosion and the like for a long time, and in order to prevent or slow down the three-sleeve synthesis waste heat boiler from damage such as hydrogen embrittlement, hydrogen corrosion, thermal stress, thermal fatigue crack and the like, the structural form is very important in designing the three-sleeve synthesis waste heat boiler.

Patent CN210165351U discloses a synthetic waste heat boiler with superheated steam as a by-product, which comprises a cylinder, an outer tube box connected to the end of the cylinder, an inner tube box and three sleeves; the barrel is internally provided with a water-separating pipe plate to divide the barrel into an evaporation section and a superheat section, the evaporation section is connected with the outer pipe box, and a thick pipe plate is arranged between the evaporation section and the outer pipe box; the three sleeves comprise an inner sleeve, a dead gas layer sleeve sleeved on the surface of the inner sleeve and an outer sleeve sleeved outside the dead gas layer sleeve; the inlet end of the inner sleeve is fixed on a thin tube plate of the inner tube box and is communicated with the inner tube box, and the outlet end of the outer sleeve is fixed on a thick tube plate; the outer tube box is provided with a gas inlet and a gas outlet, and the gas inlet is communicated with the inner tube box; the evaporation section of the cylinder body is provided with a boiler water supply inlet and a saturated steam outlet, and the superheat section of the cylinder body is provided with a saturated steam inlet and a superheated steam outlet. However, the synthetic waste heat boiler cannot compensate the thermal expansion elongation from the bottom of the synthesis tower to the pipe box of the synthetic waste heat boiler, the thermal expansion elongation is easy to generate, the stress of a welding seam for connecting the waste boiler connecting pipe, the pipe box and the shell is too large, and the welding seam is easy to crack, so that leakage accidents are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems and provide a three-sleeve synthesis waste heat boiler.

The purpose of the utility model is realized through the following technical scheme:

a three-sleeve synthetic waste heat boiler comprises a cylinder body provided with a boiler water supply inlet and a saturated steam outlet, an outer tube box connected to the end part of the cylinder body, an inner tube box arranged inside the outer tube box and three sleeves arranged in the cylinder body;

the three sleeves comprise an inner sleeve, a dead gas layer sleeve sleeved on the surface of the inner sleeve and an outer sleeve sleeved outside the dead gas layer sleeve, the inlet end of the inner sleeve is fixed on the thin tube plate of the inner tube box and is communicated with the inner tube box, the outlet end of the outer sleeve is fixed on the thick tube plate of the outer tube box and is communicated with the outer tube box, the outer tube box is provided with a gas inlet and a gas outlet, and the gas inlet is communicated with the inner tube box; the vibration damping device is characterized in that a fluctuation damping support is arranged at the other end, corresponding to the outer pipe box, of the bottom of the cylinder body.

Through setting up undulant buffering support, make waste heat boiler equipment thermal energy obtain the compensation, eliminate the thermal stress on the waste heat boiler welding seam, guarantee equipment safety in production uses, the purpose of adopting undulant buffering support is the thermal energy extension of effective compensation synthetic tower bottom to synthetic waste heat boiler pipe case to avoid the thermal energy extension to cause the welding seam stress that waste boiler takeover and pipe case and casing are connected too big, lead to leakage accidents such as fracture to appear in the welding seam.

Furthermore, the fluctuation buffer support is a spring buffer support.

Further, the spring buffer support comprises an upper support, a lower support and a buffer spring connected between the upper support and the lower support.

Further, the buffer spring is a disc spring.

Furthermore, one end of the inner sleeve penetrates through the thick tube plate of the outer tube box to be connected with the thin tube plate of the inner tube box, and the inlet of the inner sleeve is communicated with the inside of the inner tube box.

Furthermore, a short tube I and a short tube II are arranged between the inner sleeve and the inner tube box, the short tube I is sleeved on the inner sleeve, the short tube II is sleeved on the short tube I and the thin tube plate and is connected with the short tube I and the thin tube plate in a welding mode, and the inner sleeve is connected with the inner tube box in a sealing mode.

Furthermore, one end of the outer sleeve is welded on a thick tube plate of the outer tube box, and the dead gas layer sleeve is fixed on the inner sleeve to form a heat insulation dead gas layer.

Furthermore, a centering support is arranged between the dead gas layer sleeve and the outer sleeve.

Further, the end part of the outer sleeve pipe is a pipe cap.

The synthetic gas enters the inner tube box from the upper part, passes through the inner tube, then turns back to enter the annular space of the outer tube, and then passes through the outer tube box and then exits the three-tube synthetic waste heat boiler. The high-temperature synthesis gas exchanges heat with water of a shell pass in the cylinder body to generate saturated steam, the saturated steam is discharged from a steam pocket at the upper part of the cylinder body, and the synthesis gas exchanges heat through the three sleeves and then is discharged from the outer pipe box.

The three-sleeve structure of the utility model has the advantages that the dead gas layer is formed on the dead gas layer sleeve and the inner sleeve, so that high-temperature gas is prevented from entering the inner sleeve, heat is directly dissipated, heat transmission is ensured to be stable, and resource waste is reduced; the second purpose is that the high temperature environment borne by the welding seam between the thick tube plate and the outer sleeve can be effectively reduced, the outer sleeve bears great thermal stress and stress fluctuation due to thermal expansion and contraction of the outer sleeve and is transferred to the welding seam between the thick tube plate and the outer sleeve, so that the welding seam at the position is in great thermal stress and thermal fatigue state, and simultaneously, under the combined action of hydrogen embrittlement and hydrogen corrosion, the welding seam between the thick tube plate and the outer sleeve can generate micro-crack air leakage after the waste heat boiler is used for a period of time; through the design of the three-sleeve structure, the temperature of the welding seam between the thick tube plate and the outer sleeve can be effectively reduced, and the generation of overlarge temperature difference thermal stress is avoided, so that the cracking and leakage accidents of the welding seam at the position can be effectively avoided. The spring support is adopted to effectively compensate the thermal expansion extension from the bottom of the synthesis tower to the synthesis waste heat boiler pipe box, so that the phenomenon that the thermal expansion extension causes overlarge stress of a welding line for connecting the waste boiler connecting pipe, the pipe box and the shell, and the welding line is easy to crack and other leakage accidents is avoided.

The air inlet of the three-sleeve synthesis waste heat boiler is directly connected with the outlet of the synthesis tower, when the system normally operates, the position can generate larger stress due to thermal expansion, if the stress cannot be reasonably reduced, the safe use of the equipment is affected, and in order to avoid the problem, the spring support is additionally arranged at the bottom of the three-sleeve synthesis waste heat boiler to eliminate the stress at the air inlet of the waste heat boiler, so that the safe production and use of the equipment can be guaranteed. Through the utility model discloses, reduce the wasting of resources, make equipment be in low temperature, low hydrogen corrosive environment simultaneously, make the life extension of equipment, improve the economic benefits of mill.

Drawings

FIG. 1 is a schematic structural view of a three-tube synthetic waste heat boiler according to the present invention;

fig. 2 is a schematic sectional view at a in fig. 1.

Detailed Description

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

Referring to fig. 1 and 2, a three-tube synthetic waste heat boiler includes a tube body 100 provided with a boiler feed water inlet and a saturated steam outlet, an outer tube box 200 connected to an end of the tube body 100, an inner tube box 300 disposed inside the outer tube box 200, and three tubes 400 disposed inside the tube body 100; the three-way pipe 400 comprises an inner pipe 401, a dead gas layer pipe 402 sleeved on the surface of the inner pipe 401, and an outer pipe 403 sleeved outside the dead gas layer pipe 402, wherein the inlet end of the inner pipe 401 is fixed on the thin pipe plate 301 of the inner pipe box 300 and is communicated with the inner pipe box 300, the outlet end of the outer pipe 403 is fixed on the thick pipe plate 201 of the outer pipe box 200 and is communicated with the outer pipe box 200, the outer pipe box 200 is provided with a gas inlet and a gas outlet, and the gas inlet is communicated with the inner pipe box 300.

One end of an inner sleeve 401 penetrates through a thick tube plate 201 of an outer tube box 200 to be connected with a thin tube plate 301 of an inner tube box 300, an inlet of the inner sleeve 401 is communicated with the inside of the inner tube box 300, a short tube I406 and a short tube II 407 are arranged between the inner sleeve 401 and the inner tube box 300, the short tube I406 is sleeved on the inner sleeve 401, the short tube II 407 is sleeved on the short tube I406 and the thin tube plate 301 and connected with the inner sleeve 401 and the inner tube box 300 in a welding mode, one end of an outer sleeve 403 is welded on the thick tube plate 201 of the outer tube box 200, a dead gas layer sleeve 402 is fixed on the inner sleeve 401 to form a heat-insulating dead gas layer, a centering support 405 is arranged between the dead gas layer sleeve 402 and the outer sleeve 403, and a tube cap 404 is arranged at the end of the outer sleeve 403.

The utility model discloses a synthetic waste heat boiler of three sleeves, synthetic gas enter into interior pipe case from upper portion, through interior sleeve pipe, then turn back and get into the outer tube annulus, go out the synthetic waste heat boiler of three sleeves behind the outer tube case. The high-temperature synthesis gas exchanges heat with water on the shell pass to generate saturated steam, the saturated steam is discharged from a steam pocket on the upper part of the shell, the synthesis gas exchanges heat through the three sleeves and then is discharged from the outer pipe box, and the specific process parameters are shown in table 1.

TABLE 1 general design basic parameters of waste heat boilers

Item	Pass	Shell side
			Design pressure Mpa	16.5	5
Design temperature deg.C	Air inlet pipe 440 of tube box 300	270
			Medium	H₂，N₂，NH₃，CH₄，Ar	Water, water vapour

The three-sleeve structure is designed, and aims to form a dead gas layer on a dead gas layer sleeve and an inner sleeve, prevent high-temperature gas from entering the sleeve, ensure the heat transfer to be stable, and reduce the resource waste; through the design of the three-sleeve structure, the temperature of the welding seam between the thick tube plate and the outer sleeve can be effectively reduced, and the generation of overlarge temperature difference thermal stress is avoided, so that the cracking and leakage accidents of the welding seam at the position can be effectively avoided. The spring support is adopted to effectively compensate the thermal expansion extension from the bottom of the synthesis tower to the synthesis waste heat boiler pipe box, so that the phenomenon that the thermal expansion extension causes overlarge stress of a welding line for connecting the waste boiler connecting pipe, the pipe box and the shell, and the welding line is easy to crack and other leakage accidents is avoided.

By adopting the three-sleeve structure, energy consumption can be effectively utilized, heat transmission is ensured to be stable, resource waste is reduced, and high-quality saturated steam is obtained; the heat exchange effect of the three sleeves can prevent high-temperature gas from directly influencing the welding seam between the thick tube plate and the outer sleeve, solve the leakage accident of the crack of the connecting welding seam between the outer sleeve and the thick tube plate and avoid huge economic loss and safety hazard caused by production halt due to leakage in a factory; the spring support can effectively compensate the thermal expansion and elongation of equipment and pipelines, solve the leakage accidents such as the cracking of welding seams for connecting the connecting pipe with the pipe box and the shell, and avoid the huge economic loss and safety hazard caused by the production halt due to the leakage of a factory.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims

1. A three-sleeve synthetic waste heat boiler comprises a cylinder (100) provided with a boiler feed water inlet and a saturated steam outlet, an outer pipe box (200) connected to the end part of the cylinder (100), an inner pipe box (300) arranged inside the outer pipe box (200) and three sleeves (400) arranged in the cylinder (100);

the three-sleeve pipe (400) comprises an inner sleeve pipe (401), a dead gas layer sleeve pipe (402) sleeved on the surface of the inner sleeve pipe (401), and an outer sleeve pipe (403) sleeved outside the dead gas layer sleeve pipe (402), wherein the inlet end of the inner sleeve pipe (401) is fixed on a thin tube plate (301) of the inner tube box (300) and communicated with the inner tube box (300), the outlet end of the outer sleeve pipe (403) is fixed on a thick tube plate (201) of the outer tube box (200) and communicated with the outer tube box (200), a gas inlet and a gas outlet are arranged on the outer tube box (200), and the gas inlet is communicated with the inner tube box (300), and the three-sleeve pipe is characterized in that a fluctuation buffer support (500) is arranged at the other end, corresponding to the outer tube box (200), of the bottom of the barrel body (100).

2. The three-tube synthesis waste heat boiler according to claim 1, characterized in that the wave damping mount (500) is a spring-damper bracket.

3. The three-tube synthesis waste heat boiler according to claim 2, wherein the spring buffer support comprises an upper support, a lower support and a buffer spring connected between the upper support and the lower support.

4. A three-tube synthesis waste heat boiler according to claim 3, characterised in that the buffer springs are belleville springs.

5. The three-tube synthesis waste heat boiler according to claim 1, wherein one end of the inner tube (401) passes through the thick tube plate (201) of the outer tube box (200) to be connected with the thin tube plate (301) of the inner tube box (300), and the inlet of the inner tube (401) is communicated with the inside of the inner tube box (300).

6. The three-tube synthesis waste heat boiler according to claim 5, wherein a short tube I (406) and a short tube II (407) are arranged between the inner tube (401) and the inner tube box (300), the short tube I (406) is sleeved on the inner tube (401), the short tube II (407) is sleeved on the short tube I (406) and the thin tube plate (301), and the inner tube (401) and the inner tube box (300) are connected in a sealing manner by welding.

7. A three-tube synthesis waste heat boiler according to claim 1, characterized in that the outer tube (403) is welded at one end to the thick tube plate (201) of the outer tube box (200), and the dead gas layer tube (402) is fixed to the inner tube (401) to form a thermally insulating dead gas layer.

8. A three-tube synthesis waste heat boiler according to claim 7, characterized in that a centering support (405) is provided between the dead gas layer tube (402) and the outer tube (403).

9. A three-jacket synthesis waste heat boiler according to claim 7, characterized in that the jacket (403) ends with a cap (404).