Tunnel kiln and combustion control method thereof

Abstract

The invention discloses a tunnel kiln. The tunnel kiln comprises combustion chambers, a plurality of opening and closing control switches and controllers, wherein the combustion chambers are arranged at the two sides of the kiln wall of a firing section along the kiln length direction; burners are arranged in the combustion chambers and are used for burning to generate flames so as to heat green bodies in the kiln body of the firing section; the plurality of opening and closing control switches are respectively arranged on pipelines of communicating the burners and gas inlet pipelines in a one-to-one correspondence manner and are used for opening and closing fuels entering the burners, thereby controlling the combustion states of the burners; and the controllers are respectively and electrically connected to the opening and closing control switches, are used for controlling the opening and closing control switches, and further realize the control or adjustment of the combustion states of the burners, so that the combustion states of the burners in the combustion chambers can be variously combined, thereby realizing the uniform distribution of temperature in the kiln. The invention also discloses a combustion control method of the corresponding tunnel kiln. The tunnel kiln and the combustion control method thereof have the beneficial effects that the temperature distribution in the whole combustion section can be evenly adjusted, radiation and convection heat transfer effects are improved, the quality of products is effectively improved, a firing period is shortened, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of kilns, and in particular relates to a tunnel kiln and a combustion control method thereof. Background technique [0002] Tunnel kiln is a modern continuous firing thermal equipment, which is widely used in the firing production of ceramic products, and is also used in metallurgy and other industries such as abrasives. Tunnel kiln is generally a long linear tunnel with fixed walls and vaults on both sides and top, and the track running kiln car or rotating rollers at the bottom are used as the green body carrier, and the green body is preheated sequentially from the entrance. section, firing section and cooling section. The tunnel kiln that uses rotating rollers as the green body carrier is also called roller kiln. [0003] The burners of the existing tunnel kiln are relatively arranged along the two sides of the kiln wall of the firing section, and the continuous combustion method is used for production...

AI Technical Summary

Problems solved by technology

[0003] The burners of the existing tunnel kiln are relatively arranged along the two sides of the kiln wall of the firing section, and the continuous combustion method is used for production. This combustion method has the following three disadvantages: (1) Since the tunnel kiln is a flat-flame kiln, the gas The flow direction in the kiln is horizontal and forward, so it is easy to form laminar flow and cause gas stratification. The gas in the kiln forms a stable high-temperature layer and a low-temperature layer, and the temperature distribution is uneven; (2) Radiation and convection heat transfer effects are not good, fixed The high-temperature point of the burner radiates unevenly to the green body. Secondly, the high-temperature heat flow emitted by the burner forms a stable flow field, which is not conducive to convective heat transfer.

(3) Existing tunnel kilns mostly adjust the temperature in the kiln by controlling the fuel flow, which cannot accurately control the local temperature field, and the adjustment ability is poor

This scheme can solve the problem of uneven temperature stratification and fixed high temperature point that affects the firing time and quality of the green body to a certain extent, but the tunnel kiln still has a stable high temperature layer and a low temperature layer formed by the gas in the kiln. Uneven temperature distribution leads to uneven radiation of the embryo body. In particular, it cannot accurately control the local temperature field, and the structure of the above-mentioned kiln body is complex, which requires continuous mechanical transmission and control of the support mechanism supporting the embryo body. Reliable low accuracy and

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