Defects of traditional steel rolling process

The traditional steel rolling process is that the steel billets are stacked and cooled, transported to the rolling mill, and then heated in a heating furnace to be rolled into steel. This process has two defects:

1. Sawise billet digambar saka caster terus-terusan nggawe baja, suhu ing amben cooling punika 700-900 ° C, lan panas latent saka billet ora èfèktif digunakke.

2. After the continuous casting billet is heated by the heating furnace, the surface of the billet will lose about 1.5% due to oxidation.

Analisis keuntungan hemat energi:

1. Konsumsi batubara saka proses billet pemanasan tungku pemanas asli yaiku 80 kg / ton baja (nilai kalori 6400 kkal / kg), sing padha karo 72 kg batu bara standar; sawise transformasi teknologi, konsumsi energi proses yaiku 38 kWh saben ton baja, sing padha karo 13.3 kg Batubara standar.

2. Adhedhasar perkiraan produksi taunan produk baja 600,000 ton, tabungan taunan batu bara standar yaiku: (72-13.3) ÷ 1000 × 600,000 ton = 35,220 ton batubara standar.

3. Prinsip hemat energi:

Sawise billet digambar saka mesin casting terus, lumahing wis suhu 750-850, lan suhu internal malah minangka dhuwur minangka 950-1000 ° C. Salah sawijining prinsip dhasar pemanasan induksi yaiku efek kulit, yaiku energi panas ditransfer kanthi bertahap saka pemanasan permukaan. Ndhuwur, siji-katelu saka njero billet ora perlu dipanasake. Miturut ukuran salib-bagean billet sing beda, pilih frekuensi sing beda kanggo entuk efisiensi pemanasan sing luwih apik.

4. Titik hemat energi:

a) Tingkat panggunaan energi sing dhuwur kanggo pemanasan induksi bisa nganti 65 nganti 75%, dene tungku pemanasan regeneratif tradisional mung 25 nganti 30%.

b) Oksidasi permukaan billet pemanasan induksi mung 0.5%, dene tungku regeneratif bisa tekan 1.5-2%.