Introduction
High efficient spray heat exchangers are widely used in petroleum, chemicals, pressure vessels and other industries. Common types of spray heat exchangers include shell-and-tube type and plate type. They are usually used in equipment to transfer heat from one medium to another. The high efficiency spray heat exchanger is a kind of heat transfer equipment with high efficiency, which can transfer heat effectively between two fluids with different temperatures and different transmission modes. The high efficiency spray heat exchanger produced by Chinas national standard: GB4053-91 has the following features:
Working Principle
The high efficient spray heat exchanger works on the principle of heat transfer: when two substances of different temperatures pass through the passage, heat transfers from the higher temperature to the lower temperature, resulting in a degradation of the heat on the high side, and the opposite on the low side.
The spray heat exchanger works by spraying the hot and cold liquid into the heat exchange chamber. The hot liquid is sprayed from the top, and the cold liquid sprayed from the bottom. The spray droplets increase the free surface area for heat exchange between the hot and cold liquids. Heat exchange between the two liquids occurs as the spray droplets move along the wall and down the exchanger tube. The energy transfer occurs from the high temperature fluid to the low temperature one, resulting in a change of temperature of the two liquids.
Structure and Performance
The High efficient spray heat exchanger is typically composed of a heat exchange tube (1), a spray nozzle (2) and a collector (3). The heat exchange tube consists of an upstream and downstream chamber formed by two spaced tubes. The liquid sprayed into the upstream chamber passes through a narrow strip of the tube in the upstream chamber, to the downstream chamber. The liquid is then sprayed out of the sound chamber and into a collector.
The heat exchange tube is usually equipped with a number of spray nozzles, which inject the hot and cold liquids into the exchanger tube in a specific spray pattern. The injector nozzle has several design features to enhance its ability to transfer heat, including a spray angle, shape, pressure, and flow.
The collector is designed to collect the liquids sprayed from the heat exchange tube, and also to increase the overall heat transfer surface. The collector contains a number of channels, or baffles, that guide the flow of liquid from the tube to the outlet. The channels in the collector are designed to increase the area between the hot and cold fluids, thus ensuring efficient heat transfer and energy conservation.
Advantages
The High efficient spray heat exchanger has several advantages over other heat exchange systems. First, its heat transfer coefficient is very high, several times larger than that of conventional heat exchangers. Second, this type of heat exchanger has high efficiency due to its small and narrow water channels. Third, it has low diffusion loss and low pressure drop, making it suitable for high-temperature and low-volume applications. Fourth, the high fast heating and cooling rate allow it to work in bursts mode. Lastly, due to its fine water channels, the heat exchanger can handle fluids with high viscosity and chemical reactivity.
Conclusion
The high efficient spray heat exchanger is a kind of heat transfer equipment with high efficiency, which can transfer heat effectively between two fluids with different temperatures and different transmission modes. It is suitable for a variety of high-temperature and low-volume applications. The advantages of this type of heat exchanger include its high heat transfer coefficient, high efficiency, low diffusion loss, low pressure drop and fast heating and cooling rates. The Chinese national standard of GB 4053-91 provides the technical requirements for the design, manufacture, inspection and acceptance of high efficient spray heat exchangers.
