Direct-heating waste heat recovery system of centrifugal type and oil-free screw type compressors

Abstract

The invention discloses a waste heat recovery system of centrifugal type and oil-free screw type compressors. The system comprises an air compressor, a waste heat recovery device, a final-stage cooler and a heat recovery water pipe body, wherein the waste heat recovery device is a vertically mounted waste heat recovery device and comprises a vertical tube shell main body, inner heat transfer tubes, an outer heat transfer sleeve, first tube plates, an air inlet accommodating chamber and an air outlet settling chamber. The system has the effects of full and uniform heat exchange, small size, flexibility in mounting and using, durable structure, low possibility of scale deposition on the surface of the heat transfer tubes, convenience in cleaning and high recovery efficiency of the compressor.

Description

technical field [0001] The invention belongs to the field of waste heat recovery equipment, in particular to a direct heat waste heat recovery system of centrifugal and oil-free screw air compressors. Background technique [0002] There are usually two types of waste heat recovery heat exchangers for centrifugal air compressors and oil-free screw air compressors, one of which is the gas going through the shell side, and the other is the gas going through the pipe, such as figure 1 shown. The problems of the two are as follows: first, the heat transfer coefficient of the gas going through the shell is low, and the volume is too large, which may easily cause space restrictions and cannot be installed. Second, the structure of the gas tube path is mainly composed of a horizontal tube shell main body, a plurality of heat transfer tubes leading to high-temperature compressed air in the horizontal tube shell main body, and dislocation distribution tubes in the horizontal tube she...

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Problems solved by technology

The problems of the two are: first, the heat transfer coefficient of the gas shell side is low, the volume is too large, and it is easy to cause space restrictions and cannot be installed

The heat exchanger with the above-mentioned structure has the following defects: 1. The water at the inner wall of the baffle plate and the main body of the shell easily forms a vortex zone, which is easy to generate scale

2. There is a certain gap between the heat transfer tube and the baffle, and there is a certain gap between the baffle and the shell body, which is easy to cause short flow and reduce the heat exchange efficiency, especially when using direct heat exchange, due to the shell side The flow rate is too small, and the short flow is serious and cannot perform complete heat exchange

3. The cross-flow mode of compressed air flowing horizontally and water flowing vertically, compared with the pure counter-flow mode, the heat transfer efficiency is lower

4. It is difficult to clean the scale blocked in the main body of the horizontal tube shell, which not only affects the efficiency of use, but also shortens the service life of the entire heat exchanger

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