How to cool spiral plate heat exchangers with closed cooling towers
How to cool spiral plate heat exchangers with closed cooling towers
Apr 13, 2025
Spiral plate heat exchangers are widely used in the coal chemical industry. The long-term use of cooling water will cause scaling and clogging, which will affect the heat exchange efficiency, making closed cooling towers more and more popular in the coal chemical industry.
Recently, Jiangsu Huatal served a large domestic coal chemical enterprise. After a deep understanding of customer needs and pain points, we proposed a basket of transformation plans, and the remarkable results won praise from customers. The spiral plate heat exchanger of this project is made of two rolls, forming two uniform spiral channels. The two heat transfer media can flow in full countercurrent, which greatly enhances the heat exchange effect. Even two small temperature difference media can achieve ideal heat exchange effects. The pipe on the shell adopts a tangential structure with small local resistance. Since the curvature of the spiral channel is uniform, the liquid flows in the equipment without a large turn, and the total resistance is small, so the design flow rate can be increased to make it have a higher heat transfer capacity. The heat exchanger mainly realizes vapor-liquid heat exchange.
The nominal pressure PN of the spiral plate heat exchanger is 2.5Mpa (i.e. 25kg/cm) (referring to the maximum working pressure of a single channel). The test pressure is 1.25 times the working pressure. The material of the part in contact with the medium is carbon steel Q235B. The allowable working temperature is: t=0-+350℃. The liquid in the equipment channel reaches a turbulent state (generally liquid speed ≥0.5m/s; gas ≥10m/s). Spiral plate heat exchangers generally use water vapor mixture as the medium, which has the disadvantages of high heat and low cooling efficiency. For example: water vapor mixture, temperature: 102℃→85℃, flow rate: 20 m3/h, local average wet bulb temperature 27.6℃, the calculation results are as follows:
The use of spiral plate heat exchangers has the following advantages: 1. High heat transfer efficiency (good performance). It is generally believed that the heat transfer efficiency of spiral plate heat exchangers is 1-3 times that of shell and tube heat exchangers. There is no dead zone in the single channel of equal cross section. The disturbance of the flow by the fixed distance column and the spiral channel reduces the critical Reynolds number of the fluid. The heat transfer coefficient of the spiral plate heat exchanger can reach up to 3000W/(㎡.K) when the water-to-water heat exchange is carried out. 2. Effective recovery of low-temperature heat energy. The spiral plate heat exchanger is made of two rolls, which recovers waste heat and makes full use of low-temperature heat energy. 3. Strong operational reliability. The end face of the spiral channel of the non-detachable spiral plate heat exchanger is welded and sealed, so it has a high sealing performance to ensure that the two working media are not mixed. 4. Low resistance. The pipe on the shell adopts a tangential structure. Relatively low pressure loss, handle large-capacity steam or gas; self-cleaning ability, because its medium flows in a spiral shape, dirt is not easy to deposit; easy to clean, can be rinsed with steam or alkali solution, simple and easy, suitable for installation of cleaning equipment; the medium goes through a single channel, and the allowable flow rate is higher than other heat exchangers. 5. Multiple units can be used in combination. When a single device cannot meet the use requirements, multiple devices can be used in combination, but the combination must comply with the following regulations: parallel combination, series combination, the same equipment and channel spacing. Mixed combination: one channel in parallel and one channel in series. Closed cooling towers save water and electricity, especially in the western region of my country, where spiral plate heat exchangers are used in closed cooling towers, which have high heat exchange efficiency, are not easy to scale, save water, and are increasingly widely used.
Contact US
Product Information
Quantity
Unit
Piece
Support order samples, customization, wholesale direct, and complete payment. If the product you look for does not have corresponding customized content, pls fill out the form below to contact us, and we will reply ASAP.