Test ball for ball passing test and application thereof

Abstract

The invention discloses a test ball for a ball passing test and application thereof. The test ball is a frozen ball, the frozen ball is a ball body formed by solidifying water or a water-containing substance through temperature reduction, and the ball body can be melted due to heat absorption. The diameter of the frozen ball is configured according to the inner diameter of a ball passing test pipeline. The frozen ball is put into the inlet of the test pipeline, compressed air is introduced into the inlet of the test pipeline for blowing, and whether the test pipeline is qualified or not is judged according to whether the frozen ball can normally pass the test pipeline and reach the outlet of the test pipeline or not. According to the invention, the frozen ball can be easily blown in a pipeline, so that a ball passing test is smoothly carried out; and a problem welded junction can be accurately positioned through temperature monitoring, so that the accuracy and quickness of fault judgment are ensured.

Description

Technical field [0001] The present invention relates to the inspection of the replacement of boiler maintenance pipelines, and more specifically is a test ball involved in the boiler pipe pneumatic test, and the specific application of the test ball. Background technique [0002] In recent years, depth peaks have led to the increasing operation of modern large boilers, and the load change rate is getting faster. At the same time, the coal-fired prices are high, in order to enhance the survival rate of coal-fired units, the boiler begins to blend a large number of low-cost high sulfur coal, and therefore there is a need to replace the hot surface tube when the boiler is maintained. [0003] The thermal electromechanical set is mostly a peak unit, and the boiler load is frequently changed to cause frequent changes in the temperature of the hot surface. In the boiler operation, the over temperature of the pipe often occurs in the boiler over temperature explosion tube. The main area...

AI Technical Summary

Problems solved by technology

[0009] 1. For the long pipe section to be replaced, there are often more than one welding joints. If there is a welding bump in the pipe at the welding joint, the flow area of ​​the pipeline will be reduced. During the ball passing test, the steel ball will often be stuck due to these welding joints. However, it is impossible to judge which welding joint the steel ball is stuck in from the outside of the tube. It is often necessary to cut the welding joints one by one for exclusion inspection, re-weld, and re-pass the ball test until the ball passing test is qualified; It costs about 800-900 yuan, and many welding joints need heat treatment, beveling and other processes, which greatly increase the maintenance cost, workload and maintenance time

[0010] 2. When carrying out the ball passing test for vertical long pipes, U-shaped pipes with multiple elbows, serpentine pipes, etc., due to the power of compressed air, it is difficult to blow out the steel balls, and it is often impossible to carry out the ball passing test; more What's more, in the ball passing test, the pipe needs to be cut because the steel ball cannot be taken out, which greatly increases the workload and maintenance time

[0011] 3. If the ball passing test fails, the steel ball cannot stay in the tube, because the retention of the steel ball in the tube reduces the cross-sectional area of ​​the tube by at least 7 / 16, and the amount of cooling steam flowing through the tube will be greatly reduced during hot operation, which will easily cause the boiler to Explosion of tubes due to over-temperature has brought major hidden dangers to the safe operation of the boiler, which increases the risk of accidents to the ball test

[0012] 4. The diameters of the various heating surfaces of the boiler are different. If there are tube replacements on different heating surfaces, it is necessary to prepare several steel balls with different diameters. Many sites cannot find all the steel balls that meet the requirements in time, which affects the test and maintenance. the process