MPPA

Automated module for preparation of furnace atmosphere containing carbonaceous gases

The automated module for preparation of furnace atmosphere is used to premix gases before supplying them to retort furnaces for the processes of carburizing and oxidation-free heating as well as to keep automatically the required value of carbon potential in the atmosphere.

Design description:

The module is a device intended to set the ratio of technological gases while producing an atmosphere of the endogas composition. The primary regulation is carried out by the operator who takes readings of flow meters and uses valves.

A microprocessor-based controller receiving the oxygen sensor signal keeps the required carbon potential by adjusting the amount of air added.

For MPFA-MESA 02 and MPFA-MESA 04 modules, the operator sets the required setting directly in %C by means of Carbo 100 controller, which requires less efforts and eliminates any possibility of error. The controller calculates the value of carbon potential on a real time basis and carries out automatic program control using the proportional-integral-differential method. During oxygen measurements, a special-purpose l-probe produced by MESA Electronic GmbH (Germany), a reputed worldwide leader in manufacturing equipment for furnace atmosphere control, is used. Oxygen content in the atmosphere is measured while pumping gas from the furnace through a sampling pipe. A purpose-designed microcompressor is used to pump gas. This design provides more precise measurement of the carbon potential and is less subject to risk of carbon deposition in case of the operator’s errors.

MPFA-MESA 02 and MPFA-MESA 04 units have become a next step of Nakal Company to improve carburizing equipment. The units may be operated by less experienced personnel, provide greater control accuracy, decrease the frequency of scheduled maintenance and are more user-friendly. Duration and cost of their commissioning are less than that of the previous MPFA units

Carbo 100 controller

Gas supplying equipment with MESA l-probe

MPPA

Scope of delivery:

MPPA-MESA 02, MPPA-MESA 04:

1. Unit for atmosphere preparation (1 pcs.) comprising:

Set of flow meters
Air compressor
Parker tube fittings
Electromagnetic valve
Frame
Carbo 100 controller

2. MESA supply unit as a following set:

MESA power supply unit
MESA gas pump
Krohne flow meter
Siemens gas microfilter
Casing of MESA power cabinet

3. Gas supplying equipment with MESA l-probe for measuring the carbon potential (1 pcs.)

4. Set of connecting hoses (1 pcs.);

5. Signal cable for sensory feedback (1 pcs.);

6. Thermocouple to be used with l-probe for carbon potential calculation.

7. Thermocouple wire (1 pcs.);

8. Technical documentation (1 set).

Design features and advantages:

Automated control of the carbon potential within the accuracy of ±0.1 %.
Fine fixing of actual carburizing starting point, no overcarburized zones in the case, no carbide network, high repeatability of resulted properties.
High reliability and failure-free performance.

Technical specification for MPFA modules:

Installed power capacity, VA, max	500
Pressure in lines supplying propane (natural gas) and ammonia, kPa	3÷5
Natural gas consumption, l/h	90-140
Endogas composition atmosphere output, l/h	до 680
Accuracy of keeping carbon potential	±0,1%С

Overall plan

Наименование	Functionality	Ammonia consumption, l/h	Endogas composition atmosphere output, l/h	Microprocessor- based controller	Producer of microprocessor- based controller	Sensor type	Regulation parameter прибора
MPPA-MESA 04	carburizing, carbonitriding, oxidation-free quenching	10	up to 680	Carbo 100	MESA Electronic GmbH	Gas sampling pipe with MESA ѓЬ-probe, power supply unit with gas flow booster	Carbon potential, %C
MPPA-МESA 02	carburizing, oxidation-free quenching	-	up to 680	Carbo 100	MESA Electronic GmbH	Gas sampling pipe with MESA ѓЬ-probe, power supply unit with gas flow booster	Carbon potential, %