DESIGN OF TUBULAR CAISSON WITH REFRACTORY PACKING
PLACED IN WATER-COOLED TENONS FOR USE IN SILICATE MELTS
G. S. Sborshchikov
and A. Yu. Terekhova
Translated from Novye Ogneupory, No. 11, pp. 21 – 23, November, 2016.
Original article submitted July 7, 2016.
There exist a number of different designs of furnace screens. In the case of high-speed smelting units, the most
appropriate are cooled metallic caissons with refractory packing placed in tenons on the working side. A struc
tural design of such a caisson employed in a glassmaking furnace of the future is presented in the article.
Keywords: tubular caisson, glassmaking furnace, refractory packing, water cooling, silicate melt
There exist a number of different designs of furnace
screens (walls, vaults, and floors). In the case of high-speed
smelting units, the most appropriate are cooled metallic cais-
sons with refractory packing placed in tenons on the working
side . A structural design of such a caisson for the case of
a glassmaking furnace of the future is presented in the article.
We fabricate the cooled metallic surface from steel pipes
(St20; All-Russia State Standard 21729, Specification
14-3-460–75 ); pipes of diameter d = 0.042 m with thick-
ness of wall 0.005 m. The step between the axes of the pipes
S = 0.107 m. The pipes are connected together by cross
pieces (fins) made of strips of carbon steel of thickness
= 0.008 m, welded on two sides to the pipes by a continu
ous weld. The joints of the caisson are shown in Fig. 1.
The panel is welded, after which it is studded (the tenons
are welded on). We will assume  that the diameter of a
= 0.01 m. Given a relative length of a tenon of 1.6,
we determine the length of the tenon l
= 0.01 · 1.6
= 0.016 m. With a relative step of the tenons
= 3.2, the step
of a tenon S = 0.01 · 3.2 = 0.032 m. The tenons are arranged
on the heated side of the pipes in checkerboard fashion. The
axes of the central and lateral series of tenons form an angle
of 45°. We will set the thickness of the refractory packing
above the central tenon d
equal to 0.003 m. The thickness
of the refractory packing above a fin between the pipes
= 0.5d + d
= 0.5 · 0.042 + 0.016 + 0.003 – 0.5 · 0.008 = 0.036 m.
For a weakly acidic medium we select  a corundum
packing of density r
= 2150 kg/m
and thermal conductivity
= 0.593 + 0.907 ´ 10
T, W/(m · K). The design number
of pipes in the caisson n=12. The distance from the axis of
the extreme pipe to the end face of the caisson is given as
125 0107 11
The panels are gas-proof and with water cooling do not
need thermal insulation on the outer side. The total thickness
of a caisson with packing (but without a layer of lining slag)
= 0.042 + 0.16 + 0.003 = 0.061 m.
The flow area of a single pipe of the caisson with internal
= 0.042 – 0.01 = 0.032 m:
Refractories and Industrial Ceramics Vol. 57, No. 6, March, 2017
1083-4877/17/05706-0574 © 2017 Springer Science+Business Media New York
FGAOU VO NITI MISiS, Moscow, Russia.
Fig. 1. Panel of tubular packed caisson.