Three-dimensional ribbed tube bundle and shell-and-tube heat exchanger with circumferentially changing rib structure for anti-dust deposition

Abstract

The invention discloses a three-dimensional ribbed tube bundle for preventing ash accumulation and fork row and a shell-and-tube heat exchanger with a circumferentially changing rib structure; It is composed of three-dimensional ribbed tubes arranged side by side in the longitudinal direction, and there is a certain distance between adjacent three-dimensional ribbed tubes. It is characterized in that: the axial direction of the three-dimensional ribbed tubes is perpendicular to the direction of smoke inflow; ; The outer surface of each three-dimensional finned tube is provided with several fins; starting from the flue gas inlet, except for the other three-dimensional ribbed tubes arranged in the second row, the surface of these other three-dimensional ribbed tubes is located at the same The height of the ribs in the area where the inflow direction is 30°—-30° is h 1 , the height of the fins located in the area of ​​75°-120° to the direction of flue gas flow is h 3 , the height of the ribs located in the area of ​​165°--165° from the direction of the flue gas flow is h 2 , the present invention can be widely applied in the fields of electric power, energy and the like.

Description

technical field [0001] The invention relates to a shell-and-tube heat exchanger, in particular to a three-dimensional ribbed tube bundle and a shell-and-tube heat exchanger with a circumferentially variable rib structure for preventing ash accumulation. Background technique [0002] The energy crisis has always been an important issue plaguing all countries in the world. In my country, industries such as steel, electric power, building materials, and chemicals are all high-energy-consuming industries. Energy consumption accounts for 23% of global energy consumption, and coal consumption accounts for 60% of my country's energy consumption. , Thermal power consumption accounts for 54% of coal consumption. According to statistics, more than 70% of the overall heat loss of the boiler system comes from the exhaust heat loss at the tail, and the overall thermal efficiency will increase when the exhaust gas temperature decreases by 10-20°C. 0.6%-1%, correspondingly reducing coal cons...

AI Technical Summary

Problems solved by technology

With the long-term operation of the heat exchanger, fly ash will be formed after the fuel is not burned and some non-combustible substances condense. When the heat exchange equipment is used to recover the waste heat of industrial flue gas, the fly ash particles will be on the heating surface of the heat exchanger. A dust layer will be formed on the surface of the heat exchanger, which will deteriorate the heat transfer performance of the heat exchanger, and even cause local temperature unevenness, tube explosion and other vicious accidents, which will seriously affect the stability, economy and safety of the heat exchanger operation.

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