Shell and Tube Heat Exchanger for Reinforcing Agent Manufacturer

Basic Info.

Model NO.	RP-01
HS Code	8419500090
Production Capacity	10000 Pieces/Year

Product Description

Tabular Heat Exchanger Coated with Glass-lined Steel (Tube pass: material; Shell side: heat transfer medium)

The conventional tabular glass-lined steel heat exchanger adopts the integral sintering process for the glass-lined steel tubeplate and heat exchange tube. As a consequence of the stress caused by the plate itself, such process may lead to a failure of performance. The whole set is set to be scrapped once there's any enamel burst come into being.

The application of integral-formed PFA tubeplate that molded with steel liner is free from the risk of enamel burst. As a new type of detachable glass-lined steel tabular heat exchanger, both the inner enameled glass and tubeplate employs threaded seal. The high strength of heat exchanging tube and larger aperture make the materials with crystallizations or material probably causing blockages easy to pass through or get purged, so that upon the occurrence of blockage any single tube is detachable and replaceable and hence reduces the use-cost of clients. It can be used for cooling, and heating steam and heat conduction oil, the merits of the new type include--a large pressure range in application scenarios, coupled with stable performance of tubes, relatively cheap fabrication cost and high-cost performance.

Core structure PFA tubeplate molded with steel liner

The utilization of injection molding makes the PFA material get coated on the billet steel at a thickness of 40mm and forms a PFA coating layer at a thickness of 4 ~ 5mm, by means of which a better corrosion-resistant effect and strength get archived. The design of the sealing packing box and the sealing packing step makes the confined space more optimized; the sealing thread is integrally formed by the mold, so that there will be no stomata in the thread. When the sealing nut is screwed in, the strength of the sealing is greatly enhanced; Place sealing gasket on the sealing groove that is extruded through the integral molding around the tubeplate so as to better fix the position of the sealing gasket, withstand intense working conditions (high temperature, high pressure and highly corrosive), and achieve a better sealing effect. The molded PFA tubeplate that is equipped with a steel liner can withstand high temperature as high as 250ºC. The feature of a broad corrosion resistance breadth makes it especially suitable for high temperature and high-pressure conditions.

Inner Glass lined heat exchange tube

Inner glass lined tube adopts cold lining, hanging burning in furnace together with curvilinear warming process to ensure the verticality of heat exchange tube. The employment of foregoing measures also assures the thickness of glass-line on the surface of each tube come up to 0.8 ~ 1.3 mm. The standard sizes of glass-lined heat exchange tubes are DN32 × 2000, DN50 × 2000 and DND50 × 3000, which is customizable according to the field conditions. The steel blank of heat exchange tubes is made of 3.5 ~ 5mm seamless steel tubes, which has high strength and better ensures stable operation under high pressure and high temperature operation conditions. Especially in heating conditions, it can better withstand the gas vibration effect caused by the entering of steam.
Table of Dimensions Tabular Heat Exchanger Coated with Glass-lined Steel
(Tube pass: material; Shell side: heat transfer medium)

Table of Dimensions Tabular Heat Exchanger Coated with Glass-lined Steel
	Heat exchanger			Heat exchange tube
Heat exchange area (m2)	Inner diameter (DN)	Outer diameter (DN)	Total length (h)	Qty	Spec	Length (h1)
3	250	350	2100	14	Φ42	1600
5	300	400	2100	24	?)42	1600
10	400	500	2800	36	Φ42	2100
15	500	600	2800	54	Φ42	2100
20	600	700	2800	72	Φ42	2100
25	700	800	2800	90	Φ42	2100
30	700	800	2800	108	Φ42	2100
40	800	900	2800	144	Φ42	2100
50	900	1000	3800	90	Φ57	3100
60	1000	1100	3800	108	Φ57	3100
80	1100	1200	3800	144	Φ57	3100
100	1200	1300	4000	180	Φ57	3100
200	1700	1800	4000	360	Φ57	3100
300	2000	2100	4000	540	Φ57	3100
400	2300	2400	4000	720	Φ57	3100
500	2500	2600	4000	901	Φ57	3100

External Glass lined heat exchanger (Tube pass: material; Shell side: heat transfer medium)

Both the shell side and the outerwall of heat exchange tube are sintered to form a glass lined anti-corrosive coating. The tubeplate also adopts molded PFA tubeplate with steel liner, packing thread seal, single seal, single disassembly and assembly. In comparison with glass-lined tabular heat exchanger with materials going across the tube pass, it is more suitable for carrying gas-phase material thanks to the larger space on the material side, which is more conducive to gas saturation, heat transfer, and final drainage. While the heat exchange medium is carried on the tube side, a jacket is also set on the outside, and the heat exchange medium can also be carried in the jacket, so that the material can be fully heat exchanged both inside and outside. For the conventional glass-lined floating tube heat exchanger, it is prone to produce enamel burst if the general glass-lined tubeplate is brought into application; whereas it is prone to cause leakage when commissioned under high pressure conditions, supposing the PTFE tubeplate is put into operation. The two products put clients off due to high upkeep cost, complicated disassembly and assembly that degrade the work to low efficiency. In comparison with our new glass-lined tabular heat exchanger, the glass-lined floating tabular heat exchanger is dwarfed by its larger cubage under the same heat exchange surface. In addition, our new glass-lined tubular heat exchanger is more pressure-resistant, and not prone to produce shake and enamel burst subsequent to the entering of gas. Furthermore, the equipment is smaller and more convenient to disassemble and assemble. In addition, it also saves the use cost for users.

FAQ in terms of Glass-lined Tabular Heat Exchanger

1. Rate of Finished Product
The glass-lined heat exchange tube can take two forms: inner lining or outer lining. The inner glass-lined tube is generally used to carry materials on the tube side, and is cooled or heated on the shell side. It is generally suitable for liquid materials. The streaming speed is faster when the materials is carried on tube side. The inner wall of the heat pipe can produce a falling film effect, which is conducive to the rapid cooling or evaporation of the liquid. The standard specifications of glass lined tubes are generally DN32*2000, DN50*2000, DN50*3000, or customized in non-standard sizes. The outer glass-lined tube is generally used to carry materials on the shell side. Therefore, it is requested that shell side shall accept inner glass-lined treatment, and the outer wall of glass-lined tube shall be enameled. The cooling water is set to go across the tube side, which is generally suitable for cooling gaseous materials. The room of saturation is plenty and the condensate is easy to discharge if materials go across the shell side. The standard specification of outer glass-lined tube is generally ¢ * 57*3000, customizable for longer but non-standard size. Glass-lined tubes are made of cold-lined process, and thickness are controlled between 0.8~1.3 mm. Since the well furnace and the curvilinear warming process are adopted, resultantly the glass-lined heat exchange tube is not easy to deform and has good verticality. As there is no flange and chamfer in the structure of the heat exchange tube, therefore there's no grounds for the phenomenon of enamel bursting under reaction of stress. Subsequent to the sintering of glass-lined heat exchange tube, all tube in readiness still need to experience two procedures to check electrical discharge periodically by employing electrical impulse testing method. Check once again before assembly. It is compulsory to ensure that the quality of assembled heat exchange tube is 100 % assured and no electric conduction phenomena.
2.How to achieve the machining accuracy of tubeplate, especially the thickness and accuracy of glass lining?
The conventional glass-lined tube heat exchanger uses fixed or split type glass-lined tubeplate, but such process may result in faulty products. The reason is that the stress is set to escalate once the tubeplate has many holes, and the occurrence of enamel burst at the chamfer will be out of question. Almost all the conventional glass-lined tube, therefore, take large-diameter glass-lined tube as a choice, so that the stress born by the tubeplate is relatively low as the stress is in pro rata with the number of holes on the tubeplate. However, the conventional tube is incompetent to cope with heat transfer in large areas. Enamel burst will be inevitable when encountering pressure. Once the enamel burst occurs on tubeplate, the whole heat exchanger is scrapped and the use-cost is significantly increased therewith. Our company has abandoned the structural design for the conventional glass-lined tubeplates, and now the conventional design has been superseded by the national patent structure. The PFA tubeplate is die-formed on the steel plate at a thickness of 40mm by heating and molding PFA with the steel liner into one piece, in which the lining thickness is 4 ~ 5mm and the tube can withstand temperature as high as 250 ºC in addition to stand up to high pressure and absolute vacuum. Due to the tube is molded into one piece and the thickness of the lining layer is subject to the thickness of the mold, so the accuracy is high.
3. Seal form and seal material between tubeplate and tubes
The new glass-lined tube heat exchanger is a detachable glass lined heat exchange tube that adopts double tube sheet sealing form, such as cooling water is carried on the shell side. The first tubeplate is a tube made of carbon steel, each tubeplate is equipped with stuffing box. The outer sides of both ends of glass lined heat exchanger are equipped with threads, and the rubber compound O-ring is placed inside the stuffing box. Put in filling material when all glass lined tubes are well installed, and proceed to screw in the carbon steel nut to seal up. The principle is similar to the seal-up of hydraulic rigid body. Conduct pressure test on the shell-side when all parts are sealed up. As it is enabled to withstand 0 ~ 1.0 MPA pressure, the product could meet the requirements of most cooling or heating conditions in the market. When the pressure test is done, proceed to install the second PFA tubeplate that is molded with steel liner into one piece. Set stuffing box in the tubeplate as well, mold PFA into one piece, and place the fluor-elastomer compound O-ring/Tetrafluoride filler into the stuffing box as per the actual conditions of materials. Afterwards screwed in with molded pure PFA nuts for sealing, and the main body of the heat exchanger is assembled so far. Finally install glands at both ends, and then conduct pressure test on the tube-side to reassure the product is enabled to withstand pressure in a range of -0. 1 ~ 1.0 MPA.
The material is set to go across the shell side provided that an outer glass-lined tube is put into operation. The principle of sealing and the structure are all the same, although the orientation of the anti-corrosion coating of the heat exchanger tubeplate is opposite to that of the inner glass-lined tube heat exchanger. The merit of such structure effectively dealt with the porcelain burst defect of the conventional tabular glass-lined heat exchanger, and the clients are enabled to benefit from substantially slashed use-cost in view of the associated advantages like detachable, easy to cleanse and upkeep.
4. The product's operating temperature and pressure range
Operating temperature-50 ºC ~ 250 ºC
Operating pressure-0.1 MPA ~ 1.0 MPA
Conclusions deduced from the comparison with graphite heat exchanger
Compared with graphite heat exchanger, the service life and warranty period are much longer. Compared with graphite heat exchanger, for instance, the higher heat exchange efficiency contributed by the structural advantage of tubes outcompetes the former. The cost performance is not undermined even if have the maintenance cost included.

Disadvantages of graphite heat exchanger 1. Not resistant to high temperature
Generally, graphite blocks that are equipped for the graphite heat exchanger are made of impregnated graphite containing resin, resulting in a low upper limit of temperature resistance, easy to break down upon high temperature.
2. Low Pressure Resistance
Most graphite heat exchangers are based on polyblock structure. It is easy to result in leakage, at the time of the heat exchange area is large, in case of high positive pressure or high vacuum due to structural defects. Once the occurrence of leakage took place, the plant has to be shut down to replace seal(s). All matter of such is cost of maintenance and care. In consideration of the maintenance cost, the composite cost is not cost-effective although the unit price might be cheap.
3. Unresistant to high corrosion and organic solvents
Subject to the manufacturing process of graphite heat exchanger, the existing graphite is modified graphite containing resin. The service life would be badly shortened upon encountering highly corrosive organic solvents. The production is even not sustainable if there's no stock of replacement available at hands.
4. Low heat exchange efficiency
As far as the polyblock graphite heat exchanger concerned, it has no problem with the thermal conductivity of the graphite raw material itself. However, the polyblock structure is featured with dead ends and the reflux running through the block-holes leads to the convective heat transfer coefficient between the cold source and the heat source is too low to cool down the sections where materials flow through, and consequently results in a low utilization rate of heat exchange surface.

5. Unthorough discharge of materials/medium
The material/medium can be discharged normally through the S-shaped route when pressure lingers on during the cooling process. Once production is suspended, the unique structure of graphite heat exchanger may cause the residual material/medium lose pressure and prone to accumulate and block in the heat exchanger after cooling down. A crystalline film is formed and attached to the graphite surface, and the re-commissioning of graphite heat exchanger will resultantly degrade the heat exchange rate of the heat exchanger. The only way-out is to wash the residue one after another during overhaul, giving rise to an increase of maintenance cost.
6. Making it difficult to dispose graphite in the later stage
It is hardly to comply with the environmental requirements if the impaired graphite heat exchanger is unserviceable anymore and difficult to recycle.

Company Profile

Wuxi Repicea Machinery Technology Co., Ltd, as the wholly owned subsidiary of Wuxi Great Course Chemical Corrosion-proof Co., is primarily oriented in offshore operations.Situated in the Hi-Tech Industrial Park in District Huishan of Wuxi Municipality, the Company takes a floor space of 2,000 sq meters, and teamed up with a workforce of 20 employees, among of which 5 are technical specialists and another 5 are sales consultants.The company has been committed to the studies, applications and development of enamel lining in the resistance of chemical corrosion since the establishment in 1988. To date, the company has grown up to be the largest national glass-lined steel tabular heat exchanger maker.The glass-lined steel tabular heat exchangers that have been manufactured by our company by integrally die forming PFA tubeplates with steel liner inside is an innovative invention indeed in domestic market, effectively dealt with inherent proneness to enamel burst that is associated with the conventional glass-lined heat exchanger. The elimination of the scrapping of the whole set caused by the inherent defect has substantially slashed production cost for the vast number of users.We have also set foot in such special material sphere as silicon carbide, and developed innovative tabular heat exchanger made of the specials.The tabular heat exchanger is featured with high conductivity for heat, durable corrosion resistance and improved sealing performance. It meets up the blank of supply adaptable to intense working conditions in the existing market. The products presented by our company have been brought into operation in thousands of large and medium-sized chemical manufactures, receiving a wide acclaim for its reliable quality and efficient services.1. What are the merits of the innovative glass-lined tabular heat exchanger?In comparison with the conventional metallic and graphite heat exchangers available in the market, the innovative one distinguish itself from its counterparts in high resistance to corrosion, withstandable to the majority of acidic material and organic solvent.Endowed with better strength and pressure resistance, the subject is applicable to heating purpose under intense working conditions or to condense gases. The saturation room in the exchanger is so large that a better passability of crystalizable material may largely reduce the probability of blockage and the inconvenience of cleansing, thereby assured a stable performance and extended service life.2.What are the merits of tabular heat exchanger made of SiC?The tabular heat exchanger made of SiC outcompetes the conventional exchangers in ultrahigh thermal conductivity and broad breadth of corrosion resistance, e.g. the excellent heat exchanging effect upon contact with highly corrosive material.3. What are the unique characteristics of workmanship for the heat exchangers made by the Repicea?In comparison with the enamel and PTFE tubeplates who are respectively overshadowed by enamel burst and lower strength of plate, the tubeplates that equipped with our heat exchangers are all integrally die formed with PFA material with steel liner inside, an exclusive manufacturing technique, outperforming its competitors in the respect of better stability,resistence to high temperature, corrosion and absolute pressure.

Please feel free to contact with me:Wuxi Revivingpicea Machinery Technology Co., Ltd.Add: Xizhang Community, Qianqiao Street, Huishan District, Wuxi, Jiangsu, China