CN110484926B

CN110484926B - Method for preventing zirconium alloy cladding tube for nuclear power from being pickled to generate spacer printing

Info

Publication number: CN110484926B
Application number: CN201910826286.1A
Authority: CN
Inventors: 施海东; 董长富
Original assignee: Cnnc Famaton Shanghai Zirconium Alloy Pipe Co ltd
Current assignee: Cnnc Famaton Shanghai Zirconium Alloy Pipe Co ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2021-07-06
Anticipated expiration: 2039-09-03
Also published as: CN110484926A

Abstract

The invention discloses a method for avoiding a spacer mark generated by acid pickling of a zirconium alloy cladding tube for nuclear power, and belongs to the technical field of production and manufacturing of cladding tubes for nuclear power. The method for avoiding the spacer mark generated by acid washing of the zirconium alloy cladding tube for nuclear power comprises the following steps: placing, primary acid washing, secondary acid washing, rinsing, standing, drying and storing. The method for avoiding the spacer mark generated by acid washing of the zirconium alloy cladding tube for nuclear power can effectively avoid the spacer mark from acid washing while not influencing the acid washing quality, thereby ensuring the surface quality of the zirconium alloy cladding tube, being simple and convenient to operate and facilitating replacement of the spacer.

Description

Method for preventing zirconium alloy cladding tube for nuclear power from being pickled to generate spacer printing

Technical Field

The invention relates to the technical field of production and manufacturing of cladding tubes for nuclear power, in particular to a method for avoiding a spacer mark generated by acid pickling of zirconium alloy cladding tubes for nuclear power.

Background

The zirconium alloy cladding tube is usually a small-caliber thin-walled tube, and has extremely strict regulations in the aspects of flaw detection requirements, surface defect inspection, outer diameter, wall thickness, roughness and the like. The production process of zirconium alloy cladding tubes must be carefully refined to ensure consistent and controlled quality.

When the zirconium alloy cladding tube is pickled, a pickling basket is adopted to load the tube, and each layer of the tube is separated by a spacer. The problems that exist today are: when the zirconium alloy cladding tube is subjected to acid washing, the contact part of the spacer and the tube is not sufficiently washed, so that the local removal amount is small, and the spacer mark is caused. The small-size shelf marks can be removed in the subsequent polishing process, but if the shelf marks are too large, the polishing is difficult to remove, and finally the shelf marks remain and cause surface defects of the pipe, so that the shelf marks are required to be avoided when the zirconium alloy cladding pipe is subjected to acid cleaning.

Disclosure of Invention

The invention aims to provide a method for avoiding a spacer mark generated by acid washing of a zirconium alloy cladding tube for nuclear power, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an avoid pickling of zirconium alloy cladding pipe for nuclear power to produce device of shelf seal, includes the pickling basket, the pickling basket includes baffle, shelf mounting groove, shelf, the left and right sides of pickling basket all is equipped with the baffle, be equipped with a plurality of on the pickling basket shelf mounting groove, all install between the shelf mounting groove the shelf, the shelf with shelf mounting groove quantity is unanimous, be equipped with first recess and second recess on the shelf, first recess with second recess phase-match, first recess with the diameter of second recess all is 2-5 mm bigger than the diameter of zirconium alloy tubular product.

Preferably, the isolation frame is in line contact with the zirconium alloy pipe, and the angle between the isolation frame installation groove and the horizontal line ranges from 60 degrees to 80 degrees.

Preferably, the pickling basket is made of 316L material, and the spacer is made of PP material.

Further, the method comprises the following seven steps:

the method comprises the following steps: placing, namely inserting the shelves into the shelf slots, and placing the zirconium alloy pipes between every two layers of shelves;

step two: the first pickling, the pickling basket is kept high and low, immersed into a pickling tank, and kept still in the pickling tank for 20 s;

step three: carrying out secondary pickling, changing the inclination direction of the pickling basket to be opposite to the direction of the primary pickling, and standing the pickling basket in a pickling tank for 20 s;

step four: acid washing is carried out again, the second step and the third step are repeated until the acid washing removal amount reaches 10 mu m, and the zirconium alloy pipe slides left and right in the partition frame along the inclined direction of the acid washing basket during acid washing;

step five: rinsing, after the acid cleaning is finished, immediately putting the acid cleaning basket and the zirconium alloy pipe into a rinsing tank for rinsing, and completely soaking the zirconium alloy pipe in the rinsing tank for 1-2 min;

step six: standing, taking the rinsed pickling basket out of the rinsing tank, and placing on a horizontal plane for 2 min;

step seven: drying and storing, namely drying the zirconium alloy pipe in the pickling basket placed on the horizontal plane by using a hot air blower; and taking the dried zirconium alloy pipe out of the pickling basket, and keeping six pipes in group for batch storage.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention can effectively avoid the mark of the pickling spacer while not influencing the pickling quality, thereby ensuring the surface quality of the zirconium alloy cladding tube and being beneficial to the subsequent polishing process.

2. The simple operation is convenient, only need will separate the frame and install in separating the frame mounting groove, every time put the one deck and separate the frame, just place tubular product in the first recess of separating the frame, put separating the frame again, place tubular product, so a pickling basket alright pickling a large amount of tubular product for pickling efficiency is higher, separates the frame simultaneously and can break away from separating the frame mounting groove, when the frame received wearing and tearing, more conveniently changed the frame.

Drawings

FIG. 1 is a schematic structural diagram of an acid cleaning basket of a device for avoiding the occurrence of spacer marks during acid cleaning of a zirconium alloy cladding tube for nuclear power, which is described in the invention;

FIG. 2 is a schematic structural diagram of a spacer of the device for preventing the zirconium alloy cladding tube for nuclear power from pickling to generate the spacer mark.

Fig. 1 includes: 1. pickling basket; 2. a baffle plate; 3. a shelf mounting groove;

fig. 2 includes: 4. a separation frame; 5. a first groove; 6. a second groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a avoid pickling of zirconium alloy cladding pipe for nuclear power to produce device of shelf 4 seal, including pickling basket 1, pickling basket 1's the left and right sides all is equipped with baffle 2, be equipped with a plurality of shelf mounting grooves 3 on pickling basket 1, all install between shelf mounting groove 3 with 3 unanimous shelves 4 of 3 quantity of shelf mounting grooves, be equipped with first recess 5 and second recess 6 on shelf 4, first recess 5 and second recess 6 phase-match, the diameter of first recess 5 and second recess 6 all is 2-5 mm bigger than the diameter of zirconium alloy tubular product, make zirconium alloy tubular product remove one section distance when pickling basket 1 slopes and until touch baffle 2.

Preferably, but not limited to, the baffle 2 is a hollow net structure, when the device is used for pickling obliquely from side to side, pickling liquid can pass through the baffle 2, the pickling effect cannot be influenced, and the baffle 2 also plays a role in preventing the pipe from jumping out of the pickling basket 1.

Preferably, but not by way of limitation, the shelf 4 is in line contact with the pipe, and the angle between the shelf mounting groove 3 and the horizontal line is in the range of 60 to 80 degrees, so that it is more convenient to mount the shelf 4 in the shelf mounting groove 3 or to take the shelf 4 out of the shelf mounting groove 3.

Preferably, but not exclusively, the pickling basket 1 is made of a 316L material and the spacer 4 is made of a PP material, both the 316L material and the PP material being corrosion resistant, so that the pickling liquid does not cause damage to the pickling basket 1 and the spacer 4.

Further, the method comprises the following seven steps:

the method comprises the following steps: placing, namely inserting the shelves 4 into the shelves 4 grooves, placing zirconium alloy pipes between every two layers of shelves 4, splicing every two shelves 4 up and down, forming a circular structure by the first groove 5 and the second groove 6, and placing the zirconium alloy pipes in the circle, wherein for example and without limitation, 6 layers of shelves 4 can be placed in the mounting grooves 3 of the shelves 4, and 30 zirconium alloy pipes can be placed between every two layers of shelves 4;

step two: the first pickling, after putting the zirconium alloy pipes according to layers, ensuring that no crossing and dislocation occur, isolating each layer by a separation frame 4, pulling the pickling basket 1 by a chain, immersing the pickling basket 1 into a pickling tank in a state of keeping one side high and the other side low, and standing in the pickling tank for 20 s;

step three: carrying out secondary pickling, changing the inclination direction of the pickling basket 1 to be opposite to the direction of the primary pickling, and standing the pickling basket 1 in a pickling tank for 20 s;

step four: acid washing is carried out again, the second step and the third step are repeated until the acid washing removal amount reaches 10 micrometers, and the zirconium alloy pipe slides left and right in the partition frame 4 along the inclined direction of the acid washing basket 1 during acid washing, so that the zirconium alloy pipe is cleaned more cleanly;

step five: rinsing, after the pickling is finished, the pickling basket 1 is hung out of the pickling tank, the pickling basket 1 and the zirconium alloy pipe are immediately placed into the rinsing tank for rinsing, clean pure water is filled in the rinsing tank, the zirconium alloy pipe is completely soaked in the rinsing tank for 1-2 min, the pickling solution on the surface of the zirconium alloy pipe can be cleaned, after 1-2 min, the pickling basket 1 is hung out by a chain, and rinsing is finished;

step six: standing, namely taking the rinsed pickling basket 1 out of the rinsing tank, and placing the rinsed pickling basket 1 on a horizontal plane for 2min to enable residual water of the rinsing of the pickling basket 1 to drop primarily;

step seven: drying and storing, namely drying the zirconium alloy pipe in the pickling basket 1 placed on the horizontal plane by using a hot air blower; and taking the dried zirconium alloy pipe out of the pickling basket 1, and keeping six pipes in group for batch storage.

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.

Claims

1. The utility model provides a device for avoiding zirconium alloy cladding pipe pickling for nuclear power to produce and separate frame seal, includes the pickling basket, its characterized in that: the pickling basket comprises a baffle, a separation frame mounting groove and separation frames, the baffle is arranged on the left side and the right side of the pickling basket, the separation frame mounting groove is formed in the pickling basket, the separation frames are mounted between the separation frame mounting grooves, the separation frames are consistent with the separation frame mounting grooves in quantity, a first groove and a second groove are formed in the separation frames, the first groove is matched with the second groove, and the diameter of the first groove and the diameter of the second groove are 2-5 mm larger than that of the zirconium alloy pipe.

2. The device for avoiding the shelf marks generated by acid pickling of the zirconium alloy cladding tube for nuclear power as claimed in claim 1, is characterized in that: the partition frame is in line contact with the zirconium alloy pipe, and the angle between the partition frame installation groove and the horizontal line ranges from 60 degrees to 80 degrees.

3. The device for avoiding the shelf marks generated by acid pickling of the zirconium alloy cladding tube for nuclear power as claimed in claim 1, is characterized in that: the pickling basket is made of 316L material, and the separation frame is made of PP material.

4. A method for removing a spacer mark generated by acid washing of a zirconium alloy cladding tube for nuclear power by using the device of any one of claims 1 to 3, which is characterized by comprising the following seven steps: