A dissociator, suitably modified and integrated into the control system, may be installed as part of the turn-key package. It is an optional piece of equipment that allows a greater variety of highly refined processes to be carried out.

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Turbo-Cooling System

The furnace may be equipped with a special cooling system which dramatically reduces cooling times, thus shortening the total cycle time, and improving the furnace utilization rates. For the contemplated nitriding system, the heat exchanger would use approximately 40 m³ per hour of cooling water and need additional 30 kW to drive the cooling turbine.

A reduction in cooling times of up to 70% may be expected. This feature must be requested with the original Purchase Order. No retrofit is possible as the design of the entire furnace is affected.

The turbo-cooling system is typically fitted onto large furnaces that are used for carrying out relatively short cycles, generally up to ten (10) hours at temperature. The benefits of the system diminish for smaller systems and/or longer process cycles.

Note:

• Systems configured with in-process activation can not be used in conjunction with a turbo-cooling system.
• Systems configured for ONC® can not be used in conjunction with a turbo-cooling system.
• Systems configured for Nitreg®-C can not be used in conjunction with a turbo-cooling system.

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Accelerated-Cooling System

Furnaces not suited to use with a turbo-cooling system may be equipped with an accelerated-cooling system in order to reduce cooling times.  For the contemplated nitriding system, the heat exchanger will use from 4 m³/h – 8 m³/h depending on the size of the furnace to be fitted with the equipment. 

A reduction in cooling times of up to 30% may be expected.  This feature must be requested on the original purchase order.  No retrofit is possible as the design of the entire furnace is affected.

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Effluent Neutralizing Systems

Exhaust gases contain residual ammonia, nitrogen, hydrogen, and small amounts of water vapor. The outgoing gases are either directly vented to the atmosphere, or incinerated to decompose the residual ammonia, depending on local regulations and your requirements.

For this installation, Nitrex proposes one of the following pieces of anti-pollution equipment:

The exhaust may be neutralized in a high performance apparatus based on an ammonia dissociator unit, similar to the one used for dissociated ammonia used for the process. This system is usually limited to smaller installations where the outgoing gas is exhausted from the furnace at rates not exceeding 150 l/min (320 cfm). The residual ammonia will be dissociated in the unit; there is no burning involved in this process.

The exhaust gas mixture may be burned in a special incinerator. The incinerator is usually a custom-made design to suit Your Company's requirements and local regulations. The incinerator quoted herein is a standard, high efficiency unit, with internal liners aiding the dissociation of residual ammonia, and with electronic control integrated with the process control system.

Depending on their number and size it is possible to combine a few furnaces with only one incinerator, including the automatic control functions. This, however, requires a thorough review of the installation requirements and limitations, as well as the environmental requirements that may be applicable.

PICTURE

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Ammonia and Nitrogen Distribution Stations

Ammonia and/or nitrogen distribution stations are necessary to supply industrial gases from a tank or bottles to the control system at an appropriate and stable pressure, avoiding gas supply variations and freezing of the supply pipes.

Automated ammonia and nitrogen stations allow automatic switchover to reserve tanks.

PICTURE

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Closed-Loop Cooling Water System

Nitrex offers a series of water cooling systems for small and large equipment cooling needs. These are efficient, closed-loop systems circulating cooling water to plant equipment like furnaces, presses, and other thermal processing equipment.

• The WS-02 is a relatively small unit, integrated with and powered by the equipment that it serves. 
  
• The WS-03 is capable of servicing several pieces of equipment simultaneously. A signal from any equipment that requires cooling water actuates the system.
  
• The WS-03-I is a comprehensive, intelligent water cooling management system. This computer-controlled system has an output capable of simultaneously fulfilling the demands of all working equipment in a plant and adapts automatically to flow requirements

PICTURE

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Remote Control

A “Remote Control” package consists of:

• one slave computer
• one color monitor
• communication hardware to connect two control systems with a telephone line
• software for the slave computer

The system allows the user to connect with a selected control system, view the displayed process parameters, and change selected parameters during the process, or stop the cycle. The slave computer will also call a specified telephone number in case of an alarm.

It does not include any hardware or software that has to be installed at a remote location to perform the tasks described here.

PICTURE

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Barcode Reader

Can be supplied with the Nitrex Vacuum Furnace Control System for parts number entry.

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