Losses in a plant are rarely one large thing. They are many small, recurring ones: a hood that runs with too much supply air after a repair, a refiner set to a safety margin nobody has revisited, a vacuum pump that keeps running through a web break, a grade change that takes twelve minutes longer because three steps are not in the recipe. Each is a few percent. Nobody has the capacity to chase them all.
That is the work the agents take on. Each one is specialised on a single source of loss, knows which systems to read, what the reference is, and to whom a proposal has to go. The examples below are the agents of the demo plant, a paper mill with two machines, stock preparation and a combined heat and power unit.
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Drying agentdaily 06:00 · on mention
Steam per tonne of the running grade against the golden run, the best 24-hour run of the same grade in the last 90 days. Attributes deviations to hood, dryness after the press, steam pressure per dryer group, moisture profile. Proposes setpoints with effect in t steam/t and €/a.
Hood PM 3 after flap repair+22 % supply air, 1.42 instead of 1.31 t/t. Proposal −8 % supply air → ≈ 41,000 €/a
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Web break agenton every break · weekly ranking Fri 07:30
Within an hour of each break: the most likely cause with probability, from DCS events, QCS profiles, camera images from the 60 seconds before the break and the lab. Confirmed by the shift in the thread, never by the agent. Ranks recurring patterns over the week.
Week 36: 4 of 9 breaksedge cracks after manual trimmer adjustment at grade change → trimmer position into every change recipe, ≈ 9,600 €/week avoidable
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Grade change agenton MES weekly plan · after every change
Proposes a sequence with as few and as small jumps as possible while delivery dates hold. Measures every change against the best historical change of the same combination: time to on-spec, transition broke.
Week 37: 6 instead of 8 changesRecipe v7 with ramp, hood lead and trimmer: −12 min, −2.4 t per change
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Stock agentWed 14:00 · on mention
Specific refining energy per refiner and grade against the strength target instead of a safety margin; chemical dosing against wet-end measurements; fibre losses via rejects and effluent. Every setpoint names the lab values that carry it.
Refiner R2: 145 → 132 kWh/t≈ 7,400 €/month, 14-day observation. Retention overdosed after pump calibration: ≈ 11,500 €/month, maintenance ticket
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Dispatch agenton EPEX day-ahead · intraday
From day-ahead and intraday prices, gas price and steam demand: turbine mode (power- or steam-led) and the windows into which shiftable consumers can be moved. Checks chest levels before every proposal. Each shift outside the standard window needs the shift lead.
Refiners R1/R2 to Sat 11–15 hproposed ≈ 420 €. Friday's shift closed at 380 €, measured. ≈ 2,300 €/week from six shifts
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Standby agentWed 22:00 · ticket at > 2 MWh/week
Finds equipment running without production: vacuum pumps during a break, fans at the weekend, pumps at standstill. Proposes shutdown rules with restart times, because a rule that lengthens a break is not a saving.
Vacuum pumps V2/V3ran on through 6 of 9 breaks. Rule: off after 15 min standstill → ≈ 25,000 €/a. Hall fan weekend schedule: 1.9 MWh/week
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Evidence agentThu 11:00 · deadline calendar
Deadlines from ETS, the energy efficiency act and ISO 50001 flagged 90 days ahead; gaps in emission data named; drafts prepared from the measures and threads in the plant channels. Submissions only after approval by energy management.
EnEfG implementation plantwo measures without dates, completed from the plant channels, to controlling before the 30 Nov deadline
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Shift handover agent05:45 · 13:45 · 21:45
One minute of reading for the incoming shift: machine state, setpoint changes and shifts of the last shift and what was not done and why, steam and power per tonne against the golden run, open approvals, anomalies from the other channels. Ends with a "read and taken over" gate.
Night → earlyno break, three approvals waiting, hood proposal still with process engineering
Demo plant, demo data. Effects are the agents' proposal-stage estimates unless marked measured.