Nem Power-systems Brochure 712o5b

1

NEM Power-Systems »

The Power to make things move

NEM Power-Systems

«

Company profile

2

NEM Power-Systems is a subsidiary of NEM Energy b.v. in the Netherlands, a company with activities in the field of energy and environmental technology all over the world. NEM has become one of the world’s largest producers of Heat Recovery Steam Generators (HRSGs) behind Gas Turbines. Dampers are an important part of these systems, so it was a logical step to acquire access to the technology and to take over the staff of the former Stober+Morlock organization in . NEM Power-Systems has taken over all the drawings and patents and has continued with the complete damper program.

Office NEM Power-Systems in Recklinghausen, .

Head office NEM Energy b.v. in Leiden, the Netherlands.

«

Contents and worldwide activities

-

Exhaust Gas Systems 4 Diverters 6 Louvre Dampers 8 Stack Dampers 10 Flap Dampers 11 Guillotine Dampers 12 Safety Dampers 13 High Temperature Dampers 14 Installation, commissioning and maintenance 15

3

Worldwide activities.

«

Exhaust Gas Systems

Exhaust Gas Systems are designed with an elbow for connecting to the exhaust stack in simple cycle power plants and by systems with a diverter damper, or T-Box, in combined cycle power plants. With a delivery time of only six to eight months, a by stack can be installed to allow power generation ahead of the HRSG erection.

4

The advantages of a by system with diverter are: - Controlled start-up of the HRSG reduces thermal stress and prolongs lifetime - Flexibility during HRSG maintenance NEM Power-Systems has supplied a large number of exhaust gas and by systems with stack diameters ranging from 2.600 to 7.600 millimeters stack heights between 25 and 65 meters and design gas temperatures up to 680 oC.

Capabilities NEM Power-Systems has all the in-house engineering facilities necessary for producing the static and dynamic analyses for by systems according to all internationally recognized codes. Fabrication may be performed worldwide with supervision services provided by our own experienced personnel. Erection and commissioning services are also provided worldwide by NEM Power-Systems.

«

Scope of supply The scope of supply typically involves expansion ts, as cold/cold or hot/cold connections in the ducting, a horizontal transition duct from the gas turbine diff to the elbow or diverter, the elbow, diverter damper or T-Box, hot gas silencer in the stack, structural steelwork and the stack. The stack and silencer housing are designed as self-ing structures. The ducting and stacks are internally lined with high quality insulation material which is retained by stainless steel cladding. Ancillary equipment e.g. aircraft warning lights, emission ports and stack dampers for locations with high rainfall are supplied on a caseby-case basis.

5

«

Diverters

6

Diverter dampers are used to switch gas streams and to isolate equipment and processes in desulphurizating or DeNOx plants, combined cycle gas turbine/steam generator power stations and other similar applications. The special design for combined cycle systems is based on the experiences of at least three decades. Critical components (drive systems, blades sealing surfaces, etc.) are designed utilizing Finite Elements Analysis (FEA) for both thermal and mechanical loadings, steady stand and transient operation conditions.

One important step The toggle arm drive system was invented by us to handle the drive problems at big diverters and to prevent blade flattering, even at high gas velocities.

«

Delivery If possible, the diverter will be sent to site completely assembled in one piece. When local transport limitations require smaller units, the diverter can be deli­ vered in two, four or more parts. The assembly should be supervised by our specia­lists.

Finite Elements Analysis (FEA) Due to the high number of cycles required by most gas turbine specifications, we have designed (by means of FEA calculations) all important diverter parts, like shafts/pipes, seats, blades and toggle arm systems.

7

«

Louvre Dampers

8

The program includes the complete range of shut-off and regulating dampers for power stations, gas cleaning systems, cement plants and chemical industries. Some basic construction guide lines, like continuous shafts or approved blade designs, are together with a few patents the basis of this program of single and multiple blade louvre dampers. Double linkages with automatic compensation of thermal expansion, self aligning stuffing boxes and the dust-insensible, continuous sealing cone are just a few of the inventions of our engineering team.

«

The tightening principles The elastic sealing and the cone was the most important reason for the high reputation of the Stober Damper. Today we offer lamella ­sealings for gas turbines and coal fired systems. For one hundred percent tightness we offer a twin lamella seal design with seal air.

9

«

Stack Dampers

10

The dampers are used for two main purposes: - Saving energy by closing the stack and reduction of cooling down by na­tural draft during short boiler stops - Weather protection and rain water drainage for stack, silencer and boiler The newest version of the standard stack damper has a new blade design and an improved drive system, provi­ding: - Independent pressure relief on the blades - Reduced actuator torques - Cross sectional area loss has been minimized to achieve a very low pressure drop

«

Flap Dampers

The advantages of flap dampers are: - Big blades with less sealing length and very low leakage - With double sealings and the use of seal air, a simple underload maintenance of plant parts is possible These dampers are available with single and double sealings and in case of corrosion problems with heated seal air for one hundred percent tightness. The differential pressure should assist the sealing effect.

11

«

Guillotine Dampers

12

The advantages of guillotine dampers are: - Low pressure drop and high tightness - Plate and sealings are normally out of the gas stream - Short face-to-face length - Low seal air requirements Guillotine dampers are generally used when space limitations do not allow longer damper casings. As stand-alone solutions, this damper type will often be used in coal fired power plants where high ash accumulation has to be handled. But also applications for gas turbine plants are available. Almost the full cross-section of the duct is avai­ lable once the guillotine blade is fully retracted, causing a very low pressure drop.

«

Safety Dampers

Quick opening or closing and pressure relief are the main purposes of this damper type. For small dampers, we prefer weight and spring systems. For bigger louvre dampers, we use pneumatic or hydraulic cylinders with accumulators for emergency functioning.

Standard design for larger safety louvre dampers: - Electric actuator for normal operation and regulation - Pneumatic or hydraulic cylinders with accumulators for safety function (open or closed), even in case of complete energy loss

13

«

High Temperature Dampers

14

The program includes: - Butterfly and louvre dampers - Guillotines - High temperature alloys - Ceramic linings - Fire resistant concrete for frames and blades - Air cooled, ceramic felt insulated shafts No water cooled systems are included.

«

Installation, commissioning and maintenance

A qualified team of experts is available for:

Installation - Technical advice for local assembly personnel - Complete installation, including crane, scaffoldings, etc.

Commissioning We recommend this work to be supervised by our experts, especially for more complicated systems like diverters, guillotine dampers, multilouvre dampers with seal air systems, etc..

Maintenance Simple standard dampers can be checked by local plant staff, using our handbook. Diverters, guillotines and safety dampers should be checked by our specia­ lists during the standard shutdowns, preferably once a year. Our teams of specialists are available worldwide! Every job will be completed with a test program, supervised by our relevant site personnel with a final acceptance protocol.

15

«

Experience and high technology: the solid base for the NEM damper program 16

Follow-up and It has been our pleasure to show you what NEM Power-Systems does best and that our established business partners would also see something new. If you have any comments or questions, we are just a phone call or e-mail away.

NEM Power-Systems

NEM Power-Systems

Sibylla-Merian-Strasse 3 45665 Recklinghausen Telephone +49 2361 98690 Fax +49 2361 98294 E-mail [email protected] Website www.nem-ps.com

«