Design method for closed cooling tower for vapor condensation

Abstract

The invention provides a design method for a closed cooling tower for vapor condensation. The specifications of a heat exchange tube are selected according to environmental meteorological conditions and condensation requirements, a heat exchanger structure is designed according to production practical experience, a transverse tube pitch and a longitudinal tube pitch are included, a double-layer tube structure is selected and used in each procedure, the heat exchange tube is obliquely designed, thermal analysis is conducted according to energy conservation, heat transfer theory fundamental formulas and a round tube heat and mass transfer empirical formula, a wet area mass transfer process is considered, a coiler heat transfer coefficient and a mass transfer coefficient are calculated, the heat exchanger structure is determined, the air distribution quantity and the water spraying quantity needed by the closed cooling tower are obtained, and the temperature of a vapor condensation outlet, the average temperature of sprayed water, the tower outlet air temperature and moisture content, the sprayed water evaporation quantity, the supplementary water quantity and other parameters are predicted. An iterative computation thought is adopted, accuracy and normalization of the design process are improved, with the combination of heat exchanger production experience, the design method is more widely used for enterprise production practice, design efficiency is improved, and production cost is lowered.

Description

technical field [0001] The design method of the invention is applicable to the design calculation of a closed cooling tower for steam condensation, and belongs to the field of cooling tower design. Background technique [0002] As a new type of heat exchange equipment, the closed cooling tower has the advantages of water saving, energy saving, simple and compact structure, simple installation and maintenance, etc. It has better cooling efficiency than traditional heat exchange equipment, and the cooling medium is not different from the outside world. Direct contact ensures the cleanliness of the cooling medium, and has broad market prospects in the fields of air-conditioning, refrigeration, and chemical engineering. However, the domestic closed tower design method for steam condensation is not yet mature. Most manufacturers make estimates based on engineering experience, or refer to traditional design methods for design. There are large heat exchange area margins, many consu...

AI Technical Summary

Problems solved by technology

However, the domestic closed tower design method for steam condensation is not yet mature. Most manufacturers make estimates based on engineering experience, or refer to traditional design methods for design. There are large heat exchange area margins, many consumables, high costs, and waste of resources. And other issues

[0003] In addition, the traditional closed cooling tower thermal analysis focuses on the heat transfer calculation, but the heat of the medium in the pipe depends on the latent heat of vaporization of the spray water to be transferred to the air to carry the heat away, so the heat and mass transfer calculation of the spray water and air outside the pipe It is also an indispensable and important part of the thermal analysis of closed cooling towers. However, in the design of traditional closed cooling towers, the mass transfer analysis of the wet area is not available.

Images