Group7-Carbon dioxide controller for a carburizing furnace

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Carbon dioxide controller for a carburizing furnace :

Carbon dioxide controller for a carburizing furnace

Carburizing Process:

Carburizing Process A steel part can be given a hard exterior layer by diffusing free carbon into its surface. The metallurgical process of diffusing carbon into steel is called carburizing. Carburizing is normally accomplished by subjecting the steel to a fairly high temperature, about 1700 o F, for several hours in the presence of a carburizing atmosphere . Carburizing atmosphere is a mixture of normal combustion products with a specially manufactured gas. The manufactured gas contains heavy concentrations of carbon monoxide(CO) and carbon dioxide(CO 2 ).

Figure 15-12 Carburizing Furnace:

Figure 15-12 Carburizing Furnace

Slide 4:

The valve position is controlled by a system which compares the actual composition of the atmosphere to the desired composition. If the control circuitry finds any discrepancy between actual and desired composition, it adjust the valve opening accordingly.

Figure 15-13:

Figure 15-13

Slide 6:

Figure 15-13 represents the circuitry for measuring carbon dioxide (CO 2 ) concentration. The waveforms at various points in the circuit are drawn in A through H.

Figure 15-14 Carbon Dioxide:

Figure 15-14 Carbon Dioxide

Slide 8:

Figure 15-14 represents the physical appearance of the carbon dioxide (CO 2 ) measurment transducer.

Figure 15-14:

Figure 15-14

Slide 10:

In letter C, it represents the face view of the infrared chopper. In letter D, it represents the face view of the LED chopper.

Measuring the CO2 Concentration:

Measuring the CO 2 Concentration

Figure 15-15 Error Detection Circuitry:

Figure 15-15 Error Detection Circuitry

Slide 13:

b C

Slide 14:

Figure 15-15 represents the schematic diagram of the error-detection circuitry, the controller circuitry, and the final correcting device.

Slide 15:

Leader: Alvin E. Bondoc Members: Mari Faye Tolentino Eljun Franzel Angeles Rachel Dela Cruz Richard Esguerra

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