Design Guidelines for High Performance Industrial Furnaces - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 306

High performance reheating furnace

1400
1200
1000
800
600
400
200
0

Ttg
Tbg
Upper surface
Center
Lower surface
Average

024681012141618202224262830

Furnace length, (m)

Conventional reheating furnace

1400
1200
1000
800
600
400
200
0

Ttg
Tbg
Upper surface
Center
Lower surface
Average

048 2 6 0 4 8 0 2

Furnace length, (m)

FIGURE 5.65 Temperature rise curves.

1400

Conventional furnace
High performance
heating furnace

Skid mark
(Conventional furnace)

1300

1200

Skid mark
(High performance
heating furnace)

1100

02468 0 2 4 6 8 0 2 4

Division No. on the slab in the longitudinal direction

FIGURE 5.66 Distribution of discharging temperature.

This furnace has the following characteristics. The furnace incorporates a high
velocity air jet regenerative burner combustion system. With high velocity air jet
regenerative burners used to achieve the furnace performance mentioned above, the
combustion system of the furnace utilizes high temperature preheated air at a tem-
perature higher than that necessary for autoignition (about 800˚C).
The heating furnace body is reduced in size. The dimensions of the furnace body
have been decreased compared with conventional furnaces, to form a short, low
heating furnace. Since a conventional billet-reheating furnace is designed for long,