Two-section type absorption water chilling unit directly using blast furnace slag flushing water as heat source

Abstract

A two-section type absorption water chilling unit directly using blast furnace slag flushing water as a heat source comprises a unit body, and the unit body comprises a high-temperature generator and a low-temperature generator. The high-temperature generator and the low-temperature generator are sequentially connected, an inlet of the high-temperature generator is connected with a slag flushing water inlet pipeline, and an outlet of the low-temperature generator is connected with a slag flushing water outlet pipeline. According to the two-section type absorption water chilling unit, waste heat of the slag flushing water can be directly and fully utilized for refrigeration, the waste heat utilization rate of the slag flushing water is greatly increased, the requirement for temperature reduction of circulating of the slag flushing water can be completely met, and therefore the service life of a pump and equipment is effectively prolonged, and the two-section type absorption water chilling unit is beneficial to normal work of water slag conveying, slag precipitation and a slag filter; and the requirements for waste heat utilization and slag flushing water circulation temperature can be met at the same time only through the unit body, no additional equipment needs to be added for assistance, the structure is simple, and operation is easy and convenient.

Description

technical field [0001] The invention relates to a two-stage water chiller, in particular to a two-stage absorption water chiller directly using blast furnace slag flushing water as a heat source. Background technique [0002] The blast furnace will produce a large amount of slag, which must be utilized, because in the high-temperature molten state, the blast furnace slag is rapidly cooled with water to become granulated foam-shaped water slag as a raw material for building materials. The slag washing water used to cool the slag consumes a lot of water and must be recycled, and the physical heat of the blast furnace slag taken away by the slag washing water, the temperature of the slag washing water is about 80°C after heating up, so it cannot be directly circulated. Because if the water temperature is high, a large amount of foamy slag, slag cotton and a large amount of steam will be generated when flushing slag, which is not conducive to the work of water slag transportatio...

AI Technical Summary

Problems solved by technology

This utilization method is simple in technology and low in renovation cost, but there are some problems: (1) The slag flushing water has a large amount of water and contains a lot of heat, and the heating load of general factory office buildings is small, so the slag flushing water cannot The residual heat capacity is fully utilized; (2) Heating is only suitable for northern cities in winter, not in summer, while southern cities do not need heating all year round, so this method has limitations

If the temperature of the slag flushing water is low due to the slag flushing process, temperature, etc., the cooling capacity will be greatly reduced, or even cannot work normally; the single-effect hot water lithium bromide absorption chiller can only reduce the temperature of the slag flushing water to 70°C Above, the waste heat utilization rate is low, and the slag flushing water cannot be reduced to below 60°C required for recycling

[0006] In addition, there are still the following problems in the utilization of slag flushing water: (1) It contains more mechanical impurities, which are easy to settle and harden to affect heat exchange; (2) Contains more mechanical impurities, which is easy to wear the heat exchanger; (3) Total dissolution High solid, high conductivity, strong corrosion: (4) high total hardness, easy to produce scale and affect heat transfer; (5) high chloride ion content, severe corrosion to metal materials, especially stainless steel

Especially when the flash evaporation technology is used, the above problems are more serious for the flash tank after the slag flushing water is concentrated

[0007] Furthermore, the high-efficiency heat exchange tubes used in existing generators are usually finned structures. When the heat exchange tubes are operated in a high-temperature, high-velocity, corrosive lithium bromide solution, the temperature of the solution is close to the boiling point and produces fluctuating, prone to cavitation; and after long-term operation, the lithium bromide solution often contains rust particles and other dross, and oxides and dirt are prone to appear in the gaps of finned tubes; while the slag flushing water contains more mechanical impurities, which are easy to settle to the replacement The inner wall of the heat pipe, which seriously affects the heat exchange efficiency due to the fouling of the inner and outer walls of the heat exchange tube

Furthermore, the traditional heat exchange tubes are also prone to particle sedimentation at the position where the solution flow rate is low, thereby reducing the heat exchange efficiency

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