DE3539495A1 - Process for drying and combusting preferably fuel-containing combustible material and/or self-combusting combustion trolley charges - Google Patents

Abstract

Published without abstract.

Description

The invention relates to an optimization of the heat economy in the manufacture of ceramic products Coupling the firing and drying process.

The prior art has tried drying and Burning in a continuous process to perform what but consistently to low, uneconomical stocking heights led, e.g. B. the JTO system. Therefore, such systems are set not because they tend to use more heat, without the use of cheaper solid fuels lichen.

The main application divides the tunnel oven into the cooling zone like the heating zones. The latter include those zones where Furnace is supplied externally or internally, including what the firing zones and warming zones are understood. Invention According to a flow in the middle of the furnace peak between cocurrent and countercurrent, which is in the range of Heating zone.  

Depending on the firing curve required, the sections of the heating zone operated in cocurrent and countercurrent of different lengths. The one fed to the warming zone Heating gas should advantageously have a low oxygen concentration stop at early ignition of fuel and Er to avoid heating of trimmings in the heating zone. In such It is important that in the countercurrent part of the heating zone to the connection point of the hot gas transfer line for heating zone fuel is burned. With a hot gas of little Oxygen content can be in the lower temperature range Heating zone in the furnace entrance area therefore premature burning Avoid early ignition of solid fuels and the combustible heat up anyway. This is a major advantage and Aim of the main filing.

In terms of heat economy, it comes to the burning and drying process on the fact that the exhaust gas or exhaust air volumes ge as possible ring are held. This can be solved on the furnace side, the high exhaust gas temperature being good conditions for one offers more economical drying process.

It is therefore proposed the drying and firing process continuously, that means without reloading the fired goods between drying and firing and the ver a direct heating from the furnace according to the at least to a considerable extent, prefer DC operation switch for drying.

Thus two direct current processes are formulated in succession the smallest amount of waste heat with gentle treatment result in drying. According to the invention further suggested that the moisture-laden dry air part as with the furnace exhaust heat flow in the circuit again heats and is returned to the dryer.  

This system can be used on the Achieve high exhaust air temperatures from the dryer (with high moisture saturation at the same time), so that this Ab air for a third recycling stage (e.g. heating purposes) becomes usable.

The individual stages of the solid burn preferred substances and waste fuels are accordingly

• 1. Burning (high temperature)
  2. Drying (medium temperature)
  3. Heating (low temperature)

The exhaust air can be removed from the dryer at approx. 60-100 ° C compared to usually 30-60 ° C.

Drying and firing is advantageous, e.g. to Europat. Registration No. 00 59 986 made.

This makes the application larger, correspondingly more economical Combustion and drying rooms possible with sufficient, safe Burning and drying times.

The task of the invention consists of assembling different process steps in the process together with one lowest possible use of fuel, mainly solid burning to operate the drying and burning process.

With the process circuit according to the invention, the advance setting for this is to create the smallest amount of exhaust air to achieve in the drying process as well as in the burning process. So are two direct current processes in the direction of firing connected in series, then a counterflow for cooling of the good.  

Fig. 1 shows the schematic representation of the invention using an exemplary embodiment.

Fig. 2 is a temperature profile curve of the drying and firing process, with associated main air and gas streams.

• This means: 1 = heating zone of the continuous furnace = (heating + main combustion zone) 2 = heating zone of the furnace 3 = main combustion zone of the furnace 4 = direct current dryer 5 = furnace inlet valve 6 = heat exchanger on the furnace (exhaust gas flow) 7 = dryer waste heat recovery 8 = cooling zone 9 = dryer inlet valve 10 = Wet air flow to the heat exchanger 11 = heated wet air flow from the heat exchanger to the dryer 12 = hot gas line from the high temperature zone to the heating zone of the oven 13 = exhaust air flow from the dryer 14 = exhaust gas flow from the oven

Claims (5)

1. A method for drying and burning preferably fuel-containing combustible material and / or self-burning kiln cars after the main application is characterized in that the heating zone ( 1 ) of the continuous furnace in a first direct current part ( 2 ) and a countercurrent part following this in the conveying direction of the combustible material ( 3 ) is structured and the direct current part ( 2 ) of the continuous furnace is preceded by at least one direct current drying process ( 4 ). 2. The method according to claim 1, characterized in that the two direct current parts of the system are separated from one another by separating means, for example a slide ( 5 ). 3. The method according to claim 1 and 2, characterized in that the DC drying zone with the exhaust heat of the run oven is heated.   4. The method according to claim 1-3, characterized in that at least a portion of the exhaust air from the DC dry process with the exhaust gas heat of the continuous furnace via heat exchanger ( 6 ) is heated continuously or discontinuously again. 5. The method according to claim 1-4 characterized in that the exhaust air escaping from the dryer consumes heat cher is fed.