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. Po’lat ishlab chiqaruvchi uzluksiz quyma idishdan igna tortilgandan so’ng, sovutish to’shagidagi harorat 700-900 ° S ni tashkil qiladi va ignabargli latent issiqdan samarali foydalanilmaydi.

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.

Energiyani tejovchi foyda tahlili:

1. Dastlabki isitish pechini isitish ignabargli jarayonining ko’mir iste’moli 80 kg / tonna po’latdir (kalorifik qiymati 6400 kkal / kg), bu 72 kg standart ko’mirga teng; texnologik transformatsiyadan so’ng, jarayon energiya iste’moli bir tonna po’lat uchun 38 kVt soatni tashkil qiladi, bu 13.3 kg standart ko’mirga teng.

2. Yillik 600,000 72 tonna po’latdan yasalgan buyumlar ishlab chiqarish hisobiga ko’ra, standart ko’mirning yillik tejalishi: (13.3-1000) ÷ 600,000 × 35,220 XNUMX tonna = XNUMX XNUMX tonna standart ko’mir.

3. Energiyani tejash printsipi:

Uzluksiz quyish mashinasidan ignabargli quyma olingandan so’ng, sirt 750-850 haroratga ega, ichki harorat esa hatto 950-1000 ° S gacha. Induksion isitishning asosiy tamoyillaridan biri teri effektidir, ya’ni issiqlik energiyasi asta-sekin sirt isitishidan ichkariga o’tkaziladi. Yuqorida, ignabargli ichki qismning uchdan bir qismini isitish kerak emas. Har xil ignabargli tasavvurlar o’lchamlariga ko’ra, isitish samaradorligini oshirish uchun turli chastotalarni tanlang.

4. Energiyani tejash nuqtalari:

a) Induksion isitishning yuqori energiyadan foydalanish darajasi 65 dan 75% gacha bo’lishi mumkin, an’anaviy regenerativ isitish pechlari esa atigi 25 dan 30% gacha.

b) Induksion isitish plitasining sirt oksidlanishi faqat 0.5% ni tashkil qiladi, regenerativ pech esa 1.5-2% ga yetishi mumkin.