Product Profile

 

Spiral plate heat exchanger structure is simple and sophisticated, it consists of a whole plate rolled around the same S-shaped center, between the plate and the plate according to the different process requirements, welded with different arrangements of the form of fixed distance column. Two spiral flow channels with the same pitch or different sizes and completely independent of each other.

 

Spiral plate heat exchanger has concentric flow paths, while different types of fixed pitch columns are arranged according to the pressure level usage. This allows turbulent flow of fluid even at low Reynolds numbers. With this optimized flow, the heat exchange capacity of the fluid is increased and the possibility of particle deposition is reduced. This design results in a compact heat exchanger that takes up much less space, can be used in a wide range of conditions and can reduce installation costs for the customer.

 

The non-detachable type can be maintained at a much lower cost due to the all-welded, robust design and the low deposition nature of the spiral plate heat exchanger. If the customer is looking at the overall cost, the spiral plate heat exchanger is usually the cost effective choice.

 

Spiral plate heat exchanger can be manufactured by any metal with good weldability and cold bending. At present, the materials commonly used for spiral plate heat exchanger produced by our factory are carbon steel (Q235B, Q245R, Q345R) and stainless steel (S30408, S32168, S31603, S31608).

 

Typical uses of spiral plate heat exchangers

 

a. Petrochemical industry: heating and cooling of diesel, gasoline, ammonia, chlorine, nitrogen-hydrogen-ammonia mixture, brine, caustic soda, sulfuric acid, nitric acid and hydrochloric acid: heating and cooling, condensing and re-cooking systems for methanol, formaldehyde, ethanol, urea, resin, polyethylene and polypropylene intermediate monomers.

b. Metallurgical industry: heating of bauxite ore sludge, closed circuit cooling and washing liquid cooling system in steel mills, nickel refining and zinc refining, heating of zinc sulfate solution, heating and cooling of electrolyte, cooling of coke oven gas in steel mills and cooling of cooling water in steel rolling mills, etc.

c. Paper industry: steam condensation, condensate cooling and heat recovery systems.

d. Pharmaceutical industry: heating, cooling and sterilization of various pharmaceutical solutions and pure water.

e. Food industry: milk sterilization, cold milk, alcohol, beer, juice and soft drinks heating, cooling, condensing and sterilization, pasta production.

f. Printing industry: heat exchange of dyeing solution and washing water, heat recovery of discharge liquid, etc.

g. Heating system: centralized urban heating, heating of large hotels and restaurants, heat exchange in water supply and gas supply heat recovery of various boilers.

h. Machinery industry: hydraulic oil cooling, pickling pool heating, phosphating operation line heating, furnace cooling, emulsion cooling, etc.

 

Main features of spiral plate heat exchanger

 

a、Higher heat transfer coefficient

Two fluids in a relatively narrow channel of high-speed rotational flow, due to the role of fixed distance column, the fluid forms a rotating vortex surface to form turbulent flow, as long as the design of the channel, section appropriate, can form a more ideal flow state and due to the large flow rate (allow the design flow rate for liquid for ≥ 1m / s, gas flow rate of 10-30m / s), both fluids have a self-cleaning effect, the suspended matter is difficult to form scaling, siltation. siltation, based on the above reasons, the total heat transfer coefficient is as high as 2500Kcal/m2-h-℃. The heat transfer efficiency is 1-3 times that of a tube heat exchanger, and the approximate values of the overall heat transfer coefficient for commonly used media are as follows (W/m2°C).

 

Water - water Water - water vapor	1000-2200	Oil-water	220-500
Organic Vapor Water	500-1500	Non-condensable vapor-liquid	100-400

 

b. High thermal efficiency

In the case of complete convection, the temperature of the two fluids, the end can reach the basic close, in addition because of the low temperature fluid flowing on the outside. In the case of no insulation can make the heat loss to reach the most smaller, plus the two ends have all closed welding or sealed with gaskets, completely can achieve no scurry, so it can achieve high heat exchange efficiency, recovery of low-temperature heat, two heat transfer medium can be full countercurrent exchange, waste heat recovery.

 

c. Self-cleaning dirt, reduce the number of maintenance and easy access

Two kinds of fluid flow in their respective channels, if the scale once attached to the surface of the spiral plate, it will make the channel end surface area is reduced and lead to the speed of the fluid flow, so that the attached scale is easy to be washed off, debris is also difficult to silt, even if it is necessary to overhaul, detachable as long as the upper and lower sealing flange open, flush with water or use chemical agents can be cleaned.

 

d, compact structure, small footprint

Because the heat transfer coefficient is larger, the heat transfer area can be reduced in the case of the same heat transfer, and because the heat transfer surface is curled up, the material waste is smaller, the plate utilization rate is higher, compared to other types of heat exchangers to low cost, small volume, small footprint.

 

e. Wide range of applications

Because the fluid passage is made by the whole plate rolled, as long as the material suitable for the fluid can be welded it can be made, and with the above advantages, as heat exchange equipment it has an extremely wide range of applications. Especially suitable for the viscosity and state of large and uniform materials, medium temperature difference between the working conditions: high iron and manganese content in the water and hardness of the occasion. Nominal pressure is 0.6, 1.0, 1.3, 1.6, 2.5MPa, special specifications can be designed and manufactured separately.

 

Basic structure of heat transfer section

The spiral plate is curled, forming two slender fluid channels in which the two fluids flow in the form of counterflow and staggered flow respectively. Through the middle of the spiral plate to achieve the purpose of heat transfer, the width of the channel can be set according to the actual working conditions. Two plates spacing two media can be the same, or unequal distance of the different via the channel production, cone-shaped structure used in condensation, the effect is particularly obvious. No accumulation of material. Liquid-liquid exchange with heat exchanger, the top and bottom of the high and low receiver configuration, can avoid the generation of gas phase space, to extend the service life.

 

Types of Spiral Plate Heat Exchangers

 

There are basically two forms of spiral plate heat exchangers in terms of the flow direction of the medium

 

a, A type (both sides of the spiral flow): A type is the basic form of spiral plate heat exchanger, the flow of both fluids are spiral flow and is completely counter-flow to achieve the form of heat transfer.

 

b. Type B (spiral flow and cross flow): Type B is a form of heat transfer in which one fluid is spiral flow and the other fluid is right-angle cross flow. The ends of the flow channel of spiral flow are completely sealed by welding. This type is widely used in a large volume of steam or a mixture of steam, and where the evaporation of the liquid is extremely high. Cross-flow allows for minimal pressure loss of the fluid.

 

Spiral plate heat exchanger model and its representation

 

 

Example of model number representation

 

(a) non-detachable heat exchanger, made of carbon steel, design pressure 1.6MPa, nominal heat transfer area 50m², spiral plate plate width 1.0m, nominal diameter 1000mm, two spiral channel spacing of 10mm and 14mm respectively, its model number is.

BLC1.6-50-1.0/1000-10/14

 

(b) blocked detachable heat exchanger, made of stainless steel, channel 1 design pressure 0.6MPa, channel 2 design pressure 1.6MPa, nominal heat transfer area 50m², spiral plate plate width 1.0m, nominal diameter 1200mm, both spiral channel spacing 14mm, its model number is.

KLS0.6/1.6-50-1.0/1200-14-D

 

Schematic diagram of spiral plate heat exchanger structure.