Heating – Work chamber having heating means
Patent
1999-06-01
2000-11-07
Wilson, Pamela
Heating
Work chamber having heating means
432138, 432137, F27B 900
Patent
active
061427721
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the field of clay products manufacturing technology, is a type of movable tunnel kiln and manufacturing technological process system using the tunnel kiln.
BACKGROUND OF THE INVENTION
At present, main equipment for firing clay products like bricks and tiles etc are annular kilns and tunnel kilns. An annular kiln has lower heat efficiency, a bad working environment, heavy labor intensity and is in major part of manual operation. Therefore, besides some small brickfields which are employing annular kilns, most of the large and medium-sized brickfields adopt tunnel kilns. An existing tunnel kiln has a tunnel-typed kiln body, its bottom consists of a plurality of kiln cars, while the kiln cars with green bricks set on enter one end of the kiln body, pass through the kiln with four zones of preheating, firing, soaking, and cooling, come out from another end of the kiln body. Car pusher, transfer car and drafter etc should be provided. And a number of auxiliary railways should be paved for returning the cars to the kiln entry. Consequently existing tunnel kilns require pretty large investment, of which one third is for cars. In addition, since the cars has a higher daily maintenance cost for running under a high temperature environment, and air leakage on cars bottom results in quite an amount of heat loss.
SUMMARY OF THE INVENTION
The general object of the invention is aimed at above problem for existing kilns, to provide a process system of movable tunnel kiln with a higher heat efficiency and a lower construction cost, and manufacturing clay products using the tunnel kiln.
The main train of thought on realizing the object of the invention is to set the green bricks stationary under the movable kiln body, thus quite a lot of kiln cars might be saved. The specific solution is to provide a movable tunnel kilns comprising a tunnel kiln body and a kiln bottom, said kiln bottom is fixed and takes a circular shape, said kiln body is movable and circular arc, and is concentric with a circular kiln bottom, road wheels are furnished on both sides of the kiln body, they are placed on the circular railways on both sides of the kiln bottom, green bricks to be fired are piled upon a circular kiln bottom, while the kiln body moves along a circular railway, preheating, firing, soaking, and cooling the green bricks on the kiln bottom subsequently, of which the technological process is the same as existing tunnel kiln. After the fired bricks are removed from the kiln bottom, the green bricks are set again for next firing cycle.
In order to reduce conducting heat loss, lighten the kiln body weight, inner wall of the kiln body in the invention may be piled up with lightweight refractory fibre felt.
On clay products fabrication employing tunnel kiln of the invention, relevant process layout should be adopted, to fully utilize the site space inside a circular kiln, shorten the way of material flow, raise the production efficiency. Its specific process system is as follows:
Install a circular raw material ageing pit concentric with the kiln bottom in the round site space at the inside of aforesaid circular kiln bottom, and a complete brickmaking equipment is set up at the center of the above mentioned site space. Clay material, aged material and green bricks may be delivered with wagons, or transmitted with a conveyor.
On transmitting with a conveyor, may layout according to the following scheme: a clay material conveyor crossing above the kiln is installed between the outside site and inside round site space of kiln bottom, an exit of the clay material conveyor is located at the center of aforesaid inside site space of the kiln bottom, a raw material conveyor, which leads to aforesaid ageing pit and perform circular motion along the ageing pit is installed under the clay material conveyor. An ageing material conveyor which performs circular motion along the ageing pit is installed between the ageing pit and the brickmaking equipment. A movable trestle crosses above the ageing
REFERENCES:
patent: 3456308 (1969-07-01), Nicoll, Jr.
patent: 4406618 (1983-09-01), Maeyama
patent: 4580973 (1986-04-01), Mansperger et al.
Lu Jiping
Wilson Pamela
LandOfFree
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