Single-tube-replaceable low-temperature economizer with high sealing performance

Abstract

The invention discloses a single-tube-replaceable low-temperature economizer with a high sealing performance. The single-tube-replaceable low-temperature economizer comprises a shell and U-shaped heat exchange tubes, wherein a plurality of mounting holes matched with the U-shaped heat exchange tubes are formed in the shell, the straight tube part of each U-shaped heat exchange tube is inserted into the mounting hole, and the end part of the straight tube part of each U-shaped heat exchange tube extends out from the mounting hole in the other side of the shell; the U-shaped heat exchange tubes are orderly arranged, and an upper heat exchange tube row and a lower heat exchange tube row are formed on the straight tube part of each U-shaped heat exchange tube; an upper collecting box is arranged at the upper end of the side part of the shell, and a lower collecting box is arranged at the lower end of the side part of the shell; the upper collecting box is connected with the upper heat exchange tube rows, and the lower collecting box is connected with the lower heat exchange tube rows. A casing pipe comprises a horizontal tube and two internal threaded tubes, and the horizontal tube is sleeved with the two internal threaded tubes. Two positioning rings are arranged on the horizontal tube, and a limiting ring matched with the positioning ring is arranged at one end of each internal threaded tube. A connecting tube connected with the casing tube and the U-shaped heat exchange tubes are provided with external threads matched with the internal threaded tubes. The single heat exchange tube can be replaced through the casing pipe, and the casing pipe has the high sealing performance.

Description

technical field [0001] The invention relates to a coal economizer, in particular to a low-temperature economizer capable of reducing the exhaust gas temperature of various power station boilers, and belongs to the field of boiler waste heat recovery and energy saving. Background technique [0002] With the improvement of people's living standards, the demand for electricity is also increasing, so many power plant power generation equipment is also constantly improving. Due to the expansion and reconstruction of generating units, the exhaust gas temperature of boilers in many power plants will increase, deviate from the original design value, and the temperature will increase by 20 to 500 degrees. Usage amount. In order to solve the problem of flue gas temperature rise, many power plants install economizers in the flue, and use economizers to cool down the flue gas. However, traditional economizers will suffer from severe corrosion and short service life during use. Moreove...

AI Technical Summary

Problems solved by technology

Due to the expansion and reconstruction of generating units, the exhaust gas temperature of boilers in many power plants will increase, deviate from the original design value, and the temperature will increase by 20 to 500 degrees. Usage amount

In order to solve the problem of flue gas temperature rise, many power plants install economizers in the flue, and use economizers to cool down the flue gas. However, traditional economizers will suffer from severe corrosion and short service life during use. Moreover, the traditional economizer also has the disadvantages of low heat exchange efficiency, easy ash accumulation in the heat exchange tube bundle, high equipment cost and maintenance cost

[0003] In addition, the low-temperature economizer with traditional structure needs to be dismantled as a whole once it is damaged, and it needs to be repaired or replaced

Very troublesome, and the cost of each repair and replacement is very high

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