CN213680892U

CN213680892U - Online repair system for damage of furnace tube of tubular heating furnace

Info

Publication number: CN213680892U
Application number: CN202022708159.2U
Authority: CN
Inventors: 陆树华; 叶宇峰
Original assignee: Zhejiang Institute of Special Equipment Science
Current assignee: Zhejiang Institute of Special Equipment Science
Priority date: 2020-11-21
Filing date: 2020-11-21
Publication date: 2021-07-13
Anticipated expiration: 2030-11-21

Abstract

The utility model provides an online repair system of tubular heating furnace boiler tube damage, including collecting laser generator, cladding material accumulator, response electric source from trinity device and laser fiber, cladding material filling pipe, response power cable in the trinity pipeline of an organic whole, trinity device corresponds with trinity pipeline and links to each other, and the trinity pipeline penetrates in the heating furnace casing and sets up the laser cladding head in its end, cladding material filling head, induction heating coil, and the laser cladding head, cladding material filling head, induction heating coil connect respectively on the boiler tube that awaits measuring. The utility model has the advantages that: structural design is reasonable, convenient operation, and it is real-time high-efficient to restore.

Description

Online repair system for damage of furnace tube of tubular heating furnace

Technical Field

The utility model relates to a heating furnace boiler tube repair technical field, concretely relates to online repair system suitable for damages such as refining trade tubular heating furnace boiler tube is overheated, attenuate.

Background

As a typical petrochemical device, a tubular heating furnace is often used in harsh working conditions such as high temperature, high pressure, corrosion and the like, and the failure accident rate of the heating furnace is often high and is the first place of a refining enterprise. Due to the process fluctuation of the fuel pressure of the device and the like, the overtemperature phenomenon and the smoke scouring thinning caused by the deflection of the flame center, the flame lapping pipe and the like often occur in the service period of the heating furnace, and the furnace pipe is easy to deform, damage materials and even break to cause fire explosion accidents due to long-time overtemperature work and smoke scouring. The structural integrity of the furnace is critical to the long-term safe operation of the device.

At present, the number of the tubular heating furnaces in the oil refining field in China exceeds 2000, but the tubular heating furnaces are not managed by special equipment, and the research on high-temperature damage and surface modification of the tubular heating furnaces in the refining and chemical industry is lacked.

Disclosure of Invention

The utility model aims at providing a can carry out online prosthetic system to boiler tube damage such as overtemperature, attenuate in the heating furnace casing.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

the utility model provides an online repair system of tubular heating furnace boiler tube damage, including laser generator, melt and cover the material accumulator, the response is derived from trinity device and laser fiber collection of an organic whole, melt and cover material filling pipe, response power cable in trinity pipeline of an organic whole, trinity device corresponds with trinity pipeline and links to each other, trinity pipeline penetrates in the heating furnace casing and sets up the laser cladding head in its end, melt and cover material filling head, induction heating coil, the laser cladding head, it fills and sends the head to melt the material, induction heating coil connects respectively on the boiler tube that awaits measuring.

Furthermore, the number of the induction heating coils is two, and a laser cladding head and a cladding material filling head are arranged between the two induction heating coils in a superposition manner.

Compared with the prior art, the utility model, have following advantage:

the utility model relates to an online repair system of tubular heating furnace boiler tube damage can carry out online restoration (laser cladding) to boiler tube damages such as overtemperature, attenuate in the heating furnace casing, and structural design is reasonable, convenient operation, and it is real-time high-efficient to restore.

At present, laser cladding becomes one of important technologies for preparing new alloy materials, repairing and remanufacturing failed metal parts and rapidly manufacturing metal parts, and is widely applied to the fields of machine manufacturing and maintenance, automobile manufacturing, textile machinery, navigation, aerospace, petrochemical industry and the like. The laser cladding is to heat and melt a material with a special function covered on the surface of a base material by utilizing the characteristics of strong directionality, high energy aggregation and the like of laser, so that a coating with certain performance is prepared on the surface of a common base material. The laser density for laser cladding is generally 10⁴~10⁶ W/cm²Therefore, the laser cladding can realize metallurgical bonding of the coating and the matrix, and the coating with the functions of corrosion resistance, wear resistance, heat resistance, oxidation resistance, fatigue resistance and the like can be quickly prepared on the surface of the equipment, so that the surface performance of the material is remarkably improved, and the service life of the equipment is greatly prolonged.

Drawings

FIG. 1 is a schematic structural view of the online repairing system for damage of furnace tube of tubular heating furnace.

Detailed Description

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, an online repair system of tubular heating furnace boiler tube damage, including collecting laser generator, cladding material accumulator, induction source receives trinity device 1 and laser collection optic fibre as an organic whole, cladding material filling pipe, induction power cable is in trinity pipeline 2 of an organic whole, trinity device 1 corresponds with trinity pipeline 2 and links to each other, trinity pipeline 2 penetrates in heating furnace casing 3 and sets up laser cladding head 5 in its end, cladding material fills out head 6, induction heating coil 7, laser cladding head 5, cladding material fills out head 6, induction heating coil 7 connects respectively on the boiler tube 4 that awaits measuring.

The three-in-one pipeline 2 penetrates into the heating furnace shell 3 from the heating furnace manhole 8. The laser generator is connected with the laser cladding head 5 through a laser fiber, the cladding material storage device is connected with the cladding material filling head 6 through a cladding material filling pipe, and the induction power supply is connected with the induction heating coil 7 through an induction power supply cable. The number of the induction heating coils 7 is two, and a laser cladding head 5 and a cladding material filling head 6 are arranged between the two induction heating coils 7 in a superposition mode. Wherein, the induction heating coil 7 positioned in front of the laser facula motion direction has the preheating function, and can reduce the surface temperature gradient of the furnace tube; the induction heating coil 7 positioned behind the laser spot moving direction has a heat treatment effect, and can reduce the stress gradient of a repair area, so that the cracking sensitivity of a cladding coating is reduced.

An online repairing method for damage of a furnace tube of a tubular heating furnace comprises the following steps:

s1) determination and evaluation of damaged area

And determining the damaged parts of the heating furnace tube, such as overheating or thinning, by professional staff in a macroscopic inspection mode, a metallographic inspection mode, a thickness inspection mode, a hardness inspection mode and the like.

Specifically, tools such as visual, magnifying glass, a metallographic microscope, a microhardometer and the like are utilized to comprehensively judge the overheating area on the outer surface of the furnace tube of the heating furnace; measuring the thickness reduction part of the furnace tube of the heating furnace by utilizing nondestructive testing technologies such as ultrasonic thickness measurement and the like; and (3) utilizing a measuring tool to test the pipeline arrangement condition and the geometric dimension of the damaged area of the furnace tube of the heating furnace.

S2) pretreatment of damaged area

And (4) polishing the damaged area of the outer surface of the furnace tube of the heating furnace by using a special polishing machine and abrasive paper.

S3) selecting and making process of functional laser cladding material

Aiming at the base material and the service working condition of the furnace tube of the heating furnace, a laser cladding material which is compatible with the base material, has better high temperature resistance and wear resistance is selected, and can be pure metal powder or composite powder doped with reinforcing phases such as ceramic, metal powder, high-entropy alloy and the like. Specifically, if the material of the furnace tube of the heating furnace is CrMo steel, a CrNi alloy (0.70 wt.% C, 15.59 wt.% Cr, 3.60 wt.% B, 4.00 wt.% Si, 4.25 wt.% Fe, and the balance Ni) with the mass fraction of laser cladding powder of 75% and NiCr-Cr of 25% are selected₃C₂Cermet powderAnd (3) grinding.

According to the physical properties of the matrix material and the laser cladding material, technological parameters such as laser power, laser scanning speed, lap joint rate, defocusing amount, induction heating temperature, cladding material filling rate and the like are optimized. Specifically, the laser power can be selected to be 1800-2150W, the preferred laser power is 2100W, the laser scanning speed is 150-350 mm/min, the preferred laser scanning speed is 200mm/min, the induction heating temperature is 180-400 ℃, the preferred induction heating temperature is 350 ℃, the laser spot diameter is 2mm, and the lap joint rate between every two laser cladding layers is 50%.

S4) laser on-site repair

And carrying out laser cladding on the damaged part of the heating furnace tube 4 by using a movable laser cladding system. The laser cladding can select a coaxial feeding mode, a lateral feeding mode or a preset feeding mode according to field conditions. The coaxial material feeding means that the filling and gathering direction of the cladding material and the laser beam emitted by the laser cladding head 5 are positioned on the same axis, and the gathering point of the filling and feeding material is positioned in the shape of a laser spot; the lateral material feeding means that the filling and gathering direction of the cladding material and the axis of the laser beam emitted by the laser cladding head 5 form a certain oblique angle, and the gathering point of the filling and feeding material is positioned in the shape of a laser spot; the preset material feeding means that the cladding material is laid on a laser scanning path emitted by the laser cladding head 5 in advance, and the preset material is melted along with the movement of a laser spot.

And the induction heating coil 7 positioned on the upper side of the laser spot moving direction preheats the area to be repaired, the induction heating coil 7 positioned on the lower side of the laser spot moving direction carries out heat treatment on the laser cladding repairing layer, and specifically, the repairing layer is continuously subjected to induction heating for 20min at 350 ℃.

S5) post-laser repair treatment

And processing the cladding layer by using a special polishing machine until the surface roughness and the thickness of the cladding layer reach acceptable ranges.

After the damage of the heating furnace tube 4 is repaired on line, whether the cladding layer meets the actual requirement can be checked through nondestructive testing and sampling inspection; the nondestructive detection technology such as magnetic powder, penetration, ultrasonic and the like can be used for carrying out nondestructive detection on the cladding layer and the nearby area, and the technology such as macroscopic inspection, metallographic inspection, hardness inspection, thickness inspection and the like can be used for carrying out sampling inspection on the new cladding layer. If the single-layer cladding can not meet the actual requirement, multilayer laser cladding can be carried out until the technical index is reached.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a tubular heating furnace boiler tube damage online repair system which characterized in that: including laser generator, cladding material accumulator, response electric source three-in-one device and laser fiber, cladding material filling tube, response power cable in the trinity pipeline of an organic whole, three-in-one device corresponds with three-in-one pipeline and links to each other, and the trinity pipeline penetrates in the heating furnace casing and sets up the laser cladding head in its end, cladding material and fills out head, induction heating coil, and the laser cladding head, cladding material fill out head, induction heating coil are connected respectively on the boiler tube that awaits measuring.

2. The on-line repair system for the damage of the furnace tube of the tubular heating furnace according to claim 1, which is characterized in that: the number of the induction heating coils is two, and a laser cladding head and a cladding material filling head are arranged between the two induction heating coils in a superposition mode.