Zero discharge type circulating water cooling system

Abstract

The invention discloses a zero discharge type circulating water cooling system and relates to the technical field of cooling. The circulating water cooling system comprises an inner circulating cooling system and an outer circulating cooling system for providing cooling capacity for the inner circulating cooling system; a working medium of the inner circulating cooling system is cooling water; the inner circulating cooling system comprises a circulating water pipeline, a first cooler for cooling a thermal medium, a second cooler for cooling the cooling water as well as a circulating pump for driving the cooling water to flow in the circulating water pipeline, and the first cooler, the second cooler and the circulating pump are mounted on the circulating water pipeline; a working medium of the outer circulating cooling system is a coolant; and the outer circulating cooling system comprises a coolant circulating pipeline as well as a coolant circulating device, a coolant cooler and a pressure reducer which are mounted on the coolant circulating pipeline. The system has the good and stable cooling effect, can realize zero discharge of waste water, is environment-friendly and can save water resources and the cost.

Description

technical field [0001] The invention relates to the technical field of cooling, in particular to a zero-emission circulating water cooling system. Background technique [0002] For the field of cooling technology, a large amount of circulating cooling water is required due to the large amount of waste heat in the factory. If the conventional process is adopted, the consumption of raw water and the discharge of waste water will be huge, and the cost of water and water treatment will be extremely high. [0003] In addition, limited by the origin of raw materials, some factories are generally built in water-scarce areas in the northwest, and the large demand for water resources makes the conditions for building factories harsh. [0004] In today's increasingly scarce water resources, huge water consumption seriously hinders and restricts the development of enterprises. Although most enterprises have changed the cooling water to circulating cooling water, the amount of fresh wa...

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Problems solved by technology

And as the number of cycles increases, the water quality deteriorates and the hardness becomes higher, which is easy to block the equipment pipeline and greatly reduce the cooling effect. It is necessary to continuously discharge the circulating water and replenish a large amount of new circulating water, which is a serious waste of water resources.

Scale inhibitors and fungicides contained in circulating water, such as phosphate, etc., the discharge of untreated circulating water will cause serious damage to the environment

[0006] With the increasingly stringent environmental protection requirements, the discharge of recycled wastewater has become the focus of environmental protection for various enterprises. Local governments have clearly ordered new enterprises to achieve zero discharge of wastewater. Processes such as infiltration, concentration, evaporation, and drying are used to extract salt, which greatly increases the operating cost of the circulating cooling system

[0007] In addition, in the conventional circulation process, a shell-and-tube heat exchanger is used, and the cooler is composed of multiple heat exchangers. In order to consider the unified operation of the circulating water cooling system and prevent high-temperature scaling, the cooling water enters each The temperature of the cooler is generally 30°C to 32°C, and the temperature of each cooler is generally 40°C to 42°C, and the temperature rise of the cooling water is only 10°C. Under the same load, the smaller the temperature rise, the greater the circulation, and the equipment. Large size and investment

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