Cement Kiln¶
Cement rotary kiln — 1-D axial model with counter-current gas.
| Action space | Box((2,)), all actions in [-1, 1] |
| Observation space | Box((8,)) |
| Tracked variable(s) | discharge free lime (%) |
| Episode length | 700 steps (21000 s at 30 s per step) |
| Import | from target_gym import CementKiln, CementKilnParams |
| Cite as | cement_kiln-v1 |
Action space¶
Actions are normalised to [-1, 1] and mapped onto the plant's real
actuator range inside the environment.
| # | meaning | min | max |
|---|---|---|---|
| 0 | fuel | -1 | 1 |
| 1 | kiln_speed | -1 | 1 |
Observation space¶
8 values. Indices (0,) carry the tracked variable(s) that the reward scores.
Rewards¶
Free-lime tracking minus fuel.
Every environment in this suite scores on one contract: the reward is
(tracking terms, multiplied) x (1 - weighted costs), bounded in
[0, 1], and reaches 1 only while the target is held exactly. See
Reward shaping.
Starting state¶
reset samples the initial condition and the target; state has 11 fields.
Episode end¶
Termination. Both failure modes are irrecoverable in practice.
Truncation. After 700 steps.
Baselines¶
A tuned PID ships with this environment.
Arguments¶
| parameter | default |
|---|---|
delta_t |
30 |
max_steps_in_episode |
700 |
diameter |
4 |
length |
60 |
slope |
0.035 |
n_zones |
16 |
w_bed_gas |
2.906 |
w_wall_gas |
9.313 |
w_wall_bed |
3.253 |
refractory_thickness |
0.2 |
rho_refractory |
2200 |
cp_refractory |
900 |
U_shell |
4 |
raw_meal_nominal |
53.82 |
| … | 34 more, see the params dataclass |