TUBE CLEANING METHOD OF MULTITUBULAR HEAT EXCHANGER, AND TUBE CONTAMINATION DETECTION DEVICE USED IN THE SAME

摘要

PROBLEM TO BE SOLVED: To shorten a work period in cleaning a tube and to reduce costs by digitizing a degree of contamination of each tube without pulling out the tubes of a multitubular heat exchanger including a condenser, and limiting a range of the tubes to be cleaned on the basis of the degree of contamination of each tube.SOLUTION: A tube cleaning method of a multitubular heat exchanger includes a process for measuring a quantity of transmitted light of each tube of the heat exchanger by using a lighting device disposed in a water chamber at one end side of the tubes of the heat exchanger so that light enters therein from one end side of the tube of the heat exchanger, and a detection device disposed in a water chamber at the other end side of the tubes of the heat exchanger for detecting the transmitted light from the other end side of the tubes of the heat exchanger, a process for calculating a tube cleanliness of each tube of the heat exchanger from the measured quantity of transmitted light of each tube of the heat exchanger on the basis of a predetermined relationship between the quantity of transmitted light of the tube of the heat exchanger and the degree of contamination of the tube, and a process for selecting the tubes to be cleaned on the basis of the calculated tube cleanliness of the heat exchanger, and the degree of contamination of each tube of the heat exchanger is detected to limit a range of the tubes to be cleaned.SELECTED DRAWING: Figure 1