Spiral plate heat exchanger is made of two thin metal plates welded to a separate baffle (the center of the short plate) and rolled into a spiral form. The two thin metal plates form two spiral channels in the instrument, and a cover plate or a head is respectively welded on the top and the bottom. When the heat exchanger, cold, hot fluid into the two channels, the device for a rigorous countercurrent flow.
First, the advantages
(1) The total heat transfer coefficient is high. Turbulence is achieved at lower Reynolds values (typically Re = 1400-1800 and sometimes as low as 500) due to the fluid flowing in the spiral channel, and the higher flow rates (2m / s for liquids, 20m / s), so the total heat transfer coefficient larger.
(2) is not easy to block. Due to the high flow velocity of the fluid, the suspended solids in the fluid are not easily deposited, and any sediment will reduce the cross-section of the single flow channel, thus increasing the velocity and causing a flushing effect on the plugged region. Therefore, the spiral plate heat exchanger Not easy to be blocked.
(3) can use low temperature heat source and precise temperature control. This is due to the long flow path of the fluid and the complete reverse flow of the two fluids.
(4) compact structure. Heat transfer area per unit volume of tube heat exchanger 3 times.
1, The device is made of two rolls, forming two uniform spiral channels, the two heat transfer medium can be countercurrent flow, greatly enhancing the heat transfer effect, even if the two small temperature difference medium, but also to achieve the desired The heat transfer effect.
2, the casing on the adoption of tangential structure, the local resistance is small, due to the spiral channel curvature is uniform, the liquid flow in the device without large steering, the total resistance is small, which can increase the design flow rate to make it more High heat transfer capacity.
3, I-type non-removable spiral plate heat exchanger spiral channel welding the end face, which has a high sealing.
4, Type II removable spiral plate heat exchanger structural principle and non-removable heat exchanger is basically the same, but one of the channels can be detached cleaning, especially for a sticky, there is precipitation of liquid heat exchange.
5, III-type removable spiral plate heat exchanger structural principle and non-removable heat exchangers are basically the same, but the two channels can be opened for cleaning, a wide range of applications.
6, spiral plate heat exchanger by nominal pressure can be divided into PN0.6,1.0,1.6,2.5 MPa (refers to the single-channel can withstand the maximum working pressure). According to the material can be divided into carbon steel and stainless steel. Users can choose according to the actual process conditions.
7, a single device can not meet the requirements, you can use more than one combination, but the combination must meet the following requirements: parallel combination, series combination, equipment and channel spacing the same. Mixed combination: one channel in parallel, one channel in series.