
Iâve been following the operations assistants around the plant to get an understanding of their duties. The messiest and most routine job on the plant is dealing with whatâs left over after the waste is burned.
During shut-downs Iâve stood on the grate and tried not to slip on the slanting metal bars. Itâs a steep incline of steps nicknamed âpiano keysâ which push up and down, rolling the waste âdownhillâ as it burns. Above my head is a huge space covered in racks of narrow metal tubes that curl back on themselves and hang down from the distant roof like chandeliers from a cathedral ceiling. These suspended assemblies of tubes are called âpendantsâ.
It surprised me that the gas burners which ignite the waste are a long way from the waste itself. The furnace is like an oven, but so hot that anything on it spontaneously combusts. Once lit, the burners switch off and the waste ignites itself in a continuous stream.
Of course, not everything is incinerated. At the bottom of the grate staircase is a pit called the ash discharger. Metal items, ash and rubble fall into this space, steaming hot and black. Ash and debris all fall between the âpiano keysâ as they push the waste downhill. This ash is collected in âriddlingâ chutes and moved by hydraulic levers down towards the dischargers.
Clearing out the riddlings is a twice-daily job for the assistants. âMâ takes me to the space under the grate where these levers operate. Itâs hot, dark, and there are the noises of invisible hot objects falling into the chutes.
âNever look into these chutes directly, or you could get a face-full of ashâ says M, pushing a long metal scraper into the chute. âBut youâll often find cash in there â coins donât burn and they fall through the grate bars.â
At the other end, the hot ash is plunged into a tunnel of continuously recirculated water. This creates an air seal between the furnace and the outside world.
âThe dischargers are always getting blockedâ, S tells me, standing ankle-deep in ash scraped from the tunnel. âSometimes the ash is light, and just sits on top of the water. Then we get a build-up in the furnace, and we have to clear it out by hand.â
At our feet are pieces of bulky metal that the discharger couldnât cope with: motor chassis, weight-lifting dumbbells, misshapen shopping trolleys. This kind of thing shouldnât end up in a black bin, but it often does.
Once the ash is through the dischargers itâs hauled up by another hydraulic lever onto conveyor belts; soaking wet, heavy and still hot enough to steam. The welders show me a hole in the conveyor where this ash has battered and burned through the belt â they use every shut-down to weld fresh steel plates over it.
Mâs job â rotated between three others â is to sweep and hose the ash conveyors each morning. The rollers beneath the belts clog up with wet ash, or are wrapped around with long pieces of scrap wire. He uses a power hose to wash ash into a collection bay. I take the hose from him for a while and the force of it pushes me back against a wall â I fall towards a railing when I let go of the trigger and crack up laughing.
âAnd now we squeegee the floor.â M smiles âItâs kinda satisfying. Thereâs a feeling of pride in your work, when youâve made it safe and clean, and everything functions.â
Despite the power and complexity of the machines that make up the furnace, the system would fail without constant human attention.
⢠Emma Rickman is an apprentice at a Combined Heat and Power plant in Sheffield.
⢠Other entries in the âMy Life At Workâ series, and other workers' diaries