temprature increase per min

This could get tricky depending on the thermal mass of the furnace contents and the energy capacity of your heaters. Expect a fair amount of dead time in your control response.

I'd calculate the rate of change as Dravik suggests. ROC = ΔT/Δt. The time interval t will have to be based on observation. You will need to have a long enough interval to get an accurate rate, but not so long your control can't respond.

I would use the ROC as the process variable for your control loop, with heater power the controlled variable. Then, when you get to, or close to, set temperature switch to another control loop with the actual temp as the process variable.
 
here I m controlling tt 31 by plc by changing 4-20 ma manually.
n tt 32 is controlling by a programmable meter.
 
Time TT_31.PV TT_32.PV
7:24:00 PM 1,289.23 1,272.82
7:18:00 PM 1,317.76 1,298.24
7:12:00 PM 1,344.13 1,324.53
7:06:00 PM 1,367.01 1,350.55
7:00:00 PM 1,393.97 1,376.97
6:54:00 PM 1,418.20 1,402.19
6:48:00 PM 1,443.97 1,429.03
6:42:00 PM 1,472.52 1,455.96
6:36:00 PM 1,495.40 1,483.16
6:30:00 PM 1,493.69 1,506.82
6:24:00 PM 1,480.25 1,504.32
6:18:00 PM 1,464.87 1,483.98
6:12:00 PM 1,449.06 1,464.25
6:06:00 PM 1,432.87 1,443.98
6:00:00 PM 1,416.19 1,424.76
5:54:00 PM 1,397.80 1,405.02
5:48:00 PM 1,376.97 1,385.35
5:42:00 PM 1,355.25 1,365.31
5:36:00 PM 1,336.53 1,346.18
5:30:00 PM 1,315.95 1,325.97
5:24:00 PM 1,301.39 1,307.52
5:18:00 PM 1,288.41 1,291.02
5:12:00 PM 1,274.86 1,275.00
5:06:00 PM 1,260.68 1,258.78
5:00:00 PM 1,246.54 1,241.60
4:54:00 PM 1,231.86 1,225.05
4:48:00 PM 1,216.74 1,208.51
4:42:00 PM 1,200.49 1,192.38
4:36:00 PM 1,182.44 1,175.78
4:30:00 PM 1,167.70 1,159.30
4:24:00 PM 1,152.65 1,142.58
4:18:00 PM 1,136.45 1,125.83
4:12:00 PM 1,118.94 1,109.50
4:06:00 PM 1,100.95 1,092.39
4:00:00 PM 1,084.16 1,074.90
3:54:00 PM 1,069.04 1,058.57
3:48:00 PM 1,051.32 1,042.44
3:42:00 PM 1,033.54 1,024.69
3:36:00 PM 1,016.99 1,008.85
3:30:00 PM 1,017.79 994.17
 
It would help to take the data you are getting and map the response of the heat up for various output power settings.

Should give you an idea what the heater ramp looks like from a 'general' perspective. Use that to baseline where you'd expect power output to need to be and what your response time will look like for changes.
 

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