Heat Treatment Plants for Carbon Fiber Production - … · Heat Treatment Plants for Carbon Fiber Production Heeat Heeeat Heaat Heeeat El ExC l EnT Engy Er EFFiCiEnCy TEaEmP r TurE

Heat Treatment Plants for Carbon Fiber

Production

500°C 1500°C1000°C 2000°C

ExCEllEnTEnErgy EFFiCiEnCy

TEmPEraTurE aCCuraCy HigH

ExCEllEnTEnErgy EFFiCiEnCy

HigHTEmPEraTurE aCCuraCy

2000°CRuhstrat GmbH · Heinestraße 12 · 37120 Bovenden · Germany phone +49 (0) 55 93 803-0 · fax +49 (0) 55 93 803-50 e-mail: [email protected] · www.ruhstrat.com

CusTom-madE ProduCT soluTions

Ruhstrat is a modern medium-sized family-owned company whose suc-cessful family tradition is being con-tinued by the forth generation now. Since the foundation in 1888, our quality products in the field of elec-trical engineering and plant construction have been established.

Since that time, true to the company motto „Convincing Down To The Smallest Detail“, we have been engaged in the worldwide distribution of electrical and combustible-heated industrial furnaces for various heat treatments and branches in de-veloping the optimal plant matched to each particular requirement. In doing so, we always assist our customers be-ing a competent partner, from the de-sign to the construction and manufac-ture up to the commissioning.The customer takes centre stage at Ruhstrat. Whether heat treatment plants for the metal processing indus-try, the chemical industry or the car-bon industry are needed, our declared company goal is to develop high-quality forward-looking technolo-gies which are most suitable for our customers. In close contact with the user, we create individual reasonable and economic solutions. Highly quali-fied personnel and modern equipment guarantee a comprehensive service and first-class quality. We can rely on our flexible and pro-active employees

and on more than 110 years of practi-cal experience in designing industrial furnaces.

Ruhstrat GmbH supplies world wide production lines for carbon fibers with heat treatment plants. This ena-bles manufacturers to increase their

production capacity.

Carbon fibers are considered as one of the most impor-tant materials of the future.

Particularly due to the devel-opment in the energy sector this

material has strongly gained in im-portance. In the air craft industry

more and more components are used out of carbon fiber, because they are much lighter than components out of aluminium and therefore the gas con-sumption of air planes can be reduced enormously. Also when using renew-able energy carbon fibers play a key role. The rotor blades of big offshore wind power plants consist usually of carbon fibers. Therefore the world wide demand for carbon fibers has strongly increased.

For more than 25 years Ruhstrat GmbH from Germany is developing heat treat-ment plants for carbon fiber produc-tion, which enable the manufacturers of carbon fibers to increase their pro-duction enormously. Today’s industrial furnace plants make a production ca-pacity of more than 2,000 tons per year possible.

For decades Ruhstrat GmbH is an im-portant supplier for the carbon indus-try. With its complex industrial furnace plants the company supplies the deci-sive core technology for the production of carbon fibers. The plants are used for carbonizing and graphitizing. In the plants yarns, felts, fleeces, bands, fabrics, up to pipes and other parts are produced.

The scope of delivery of the industrial furnace plants of Ruhstrat GmbH for a carbon fiber line include the following components for the heat treatment: a LT- furnace (low temperature

furnace) till approx. 1,050 °C a HT- furnace (high temperature

furnace) till approx. 1,800 °C a UHT- furnace (ultra high temper-

ature furnace) till approx. 2,600 °C

Furthermore Ruhstrat has developed special inlet and outlet sealing boxes, cooling zones, gas distribution sta-tions, gas pre-heating equipment, cooling water distributors as well as a complete measuring and control sta-tion with its own process control sys-tem for the industri-al furnace plants.

ruhstrat — the specialist for Temperatures up to 3,000 °Cfor more than 100 years

ruhstrat — the specialist for Temperatures up to 3,000 °Cfor more than 100 years

solutions fitted exactly to the Process requirements for Carbon Fiber Production

HEaT TrEaTmEnT PlanTs For CarBon FiBEr ProduCTion

The advantages of the industrial furnace plants of ruhstrat gmbH are:

up to 50 % less installed power than the competi-tion.

high temperature con-stancy over the width of the fiber through hot gas fans and panel heating of the lT-furnace.

high temperature con-stancy over the width of the fiber through a circular

heating around the muffles of the HT- and uHT-furnace.

low energy losses through the application of high quality insulation materials.

low consumption of pro-tection gas because of the Ruhstrat-sealing box systems.

high durability of the muf-fles through patented bearings and additional components for the controlled expansion.

low shutdown time and maintenance costs through the choice of high quality materials and components.

Ruhstrat GmbH · Heinestraße 12 · 37120 Bovenden · Germany phone +49 (0) 55 93 803-0 · fax +49 (0) 55 93 803-50 e-mail: [email protected] · www.ruhstrat.com


lT-FurnaCE The Muffle has patented bearings.

The expansion of the muffle from the muffles middle to the outside.

The expansion in longitudinal direction is supported and controlled by a special equipment.

Construction of the muffle is made by a special software.

This eliminates thermal tension inside the muffle.

Durability and life time of the muffle increases.

By using special stream plates in the in-let area of the muffle, the condensate of tar is minimized.

Heating consists of high quality ceramic fiber modules with integrated heat-ing. Heating conductors are made for a max. heating conductor temperature of 1,180 °C. This means a durability of several years.

By using these heating modules a very homogeneous temperature spreading is attained.

The insulation of the backward wall con-sists of high quality mineral fiber. This reduces the loss of heat. Lost power is approx. 350 W per m² at 850° furnace temperature.

oxidation ovenunwinders

central exhaust gas treatment


The body of the furnace is equipped with special cooling plates which cool directly the heating space, no „sandwich“ construction: metal-wall -thermal conduction cement –cooling plates. This avoids local overheating of the body.

The insulation consists of only high quality graphite insulation (graphite felts). As last layer there is a high qual-ity ceramic fiber.

The heating is located around the muffle. This makes the furnace to at-tain a very homogeneous balanced temperature.

Each heating zone is 3-phase. This means that the supply network system is charged in a symmetric way.

As an option we can provide special-ly by Ruhstrat manufactured variable transformers. Advantages over thy-rister regulations are that the power network is not loaded with harmonic waves. Expensive compensation equip-ment is therefore not needed.

The high current transformers manu-factured by Ruhstrat are integrated into the supporting stand. There is no need for caves on the ground floor.

Water coolings are cased as much as possible. Hoses will be avoided where it is possible.

HT-FurnaCE


low temperature furnace

inlet sealing box

outlet sealing box



sEaling BoxEs Sealing boxes are made of stainless

steel.

Inside the sealing boxes there are ad-justable and distortion free orifices made of stainless steel, CFC, graph-ite, according to applied temperature. Therefore the transition gap is constant all over the total width.

The inlet and outlet compartments can be opened and shut together or sepa-rately by hand wheels. This means that the gap can be adjusted to the thread pass-through in ideal way during the process.

The inlet sealing boxes are insulated and can be run at 400 °C hot nitrogen.

The gas heater including the necessary gas armatures is available at an extra charge.

The outlet sealing boxes are water cooled and serve in cooperation with the inlet cold nitrogen as cooling zone.

damping zone with outlet sealing box

high temperature furnace

inlet sealing box

surface treatment


Furthermore Ruhstrat has gas pre-heat-ing equipment, cooling water distributors as well as a complete measuring and con-trol station with its own process control system for the industrial furnace plants.

In a more and more complex market, Ruhstrat has made a point of breaking new ground always to-gether with its custom-ers. That is the best road to success. Our qualified engineers offer a compre-hensive expert advice to the customer. They discuss in detail customer require-ments, they develop and

propose solutions and finally conceive and design a custom-made heat treat-ment plant.

Project-oriented designing and construc-tion enables us attaining results which are optimally matched to the particu-lar customer – both for electrically and

combustible-heated furnaces.

Beyond the innovative prod-ucts and technologies for the heat treatment, Ruhstrat provides in-a-box perform-ances with regard to the re-quirements involved:

ComPonEnTs and sErviCE

surface treatment

sizing anddrying

rewinders


competent project advice

designing heat treatment plants opti-mized for the customer’s application

economic and environmentally sound construction

professional designing and manufactu-ring of all equipments

professional assembly and commissioning

theoretical and practical training of the customer’s staff

comprehensive after-sales service


500°C

.com

Binding PostsSocketsLead-Through Bolts

TransformersVoltage StabilizersReactorsPower Resistors

Emergency Power SupplyEmergency Lighting

Industrial Furnaces

Ruhstrat GmbHHeinestrasse 12 37120 Bovenden Germany

phone: +49 (0) 55 93 803-0 fax: +49 (0) 55 93 803-50

e-mail: [email protected] internet: www.ruhstrat.com Department: Industrial Furnaces phone: +49 (0) 55 93 803-19 fax: +49 (0) 55 93 803-50 e-mail: [email protected]

03/2011Technical details are subject to change

Documents

Heat Treatment Plants for Carbon Fiber Production - … · Heat Treatment Plants for Carbon Fiber Production Heeat Heeeat Heaat Heeeat El ExC l EnT Engy Er EFFiCiEnCy TEaEmP r TurE