DE19740616A1 - Gas cleaning equipment for electric kiln firing ceramics - Google Patents

Abstract

Gas cleaning equipment for electric kiln firing ceramics uses baffle-plated cascade scrubber with recirculation of water leaching caliciferous slag to achieve purity for polishing by subsequent catalyst. The cooler includes two or more chambers interconnected below. Into these, a high connection is made from the furnace. At the upper end of the sheeted section (3), there is an adsorbent packing. A pump and line connect this to a chamber below. This contains water and neutralization agent.

Description

The invention relates to a device for separation and neutra lization of gases from electric furnaces when burning ceramic masses and heating masses, the inorganic and / or have water-containing components, which by the Pass the heating process in gas or vapor form.

Capacitors are known which cool gases containing water vapor and thus remove the proportion of water vapor from the exhaust gas, which can be condensed up to the cooling temperature. Are also known Mist separators (demistors) that make up the condensed droplets take out the gas flow and separate with the liquid.

However, these known methods only incompletely clean the exhaust gases constantly. To achieve such a low concentration of anor ganic proportions, such as those of a subsequent catalytic Cleaning unit to achieve a long catalyst life is required, the capacitor would have to be made uneconomically large and an expensive washing unit can be installed.

The aim of the invention is therefore with a small capacitor and a final purity of gases without subsequent gas washing from electrically heated ovens that are sufficient for one Long service life of the subsequent catalytic exhaust air cleaning are.

Surprisingly, it has now been found that the special their temperature response from electric furnaces a combination a capacitor with at least 2 plates with a surface surface of approx. twice as much square decimeter as kg Bulk can be put in the oven and one underneath lying condensation container with about as much liters as kg Bulk be put in the oven.

The required final purity is then generated when the in Separator containing liquid with a circulation pump in the 2nd Plate of the capacitor is injected and above this one an adsorbent, such as calcium-containing furnace slag, in a container are arranged.  

With this combination, a substantial reduction in price is achieved and reliable separation even in special phases of Kiln operation high specific emissions.

The following description of the device and an embodiment Example with operating results show the invention in detail.

An electrically heated kiln has a connecting pipe 1 to a condenser. The condenser consists of 2 sheet metal pockets 2 and 3 , corresponding to FIG. 1, which has a cooling surface of 0.4 to 4, preferably 2 × furnace loading of kilograms in dm2, ie the cooling surface of the condenser 5 is for a kiln feed of 30 kg up to 60 dm2, preferably 30 dm2 = 0.3 m2.

At the end of the second sheet metal pocket 3 , a perforated plate or sieve 5 is arranged on which an adsorbent 4 , such as dolomite or smelting furnace slag, is in the form of granules in a bulk container. This bulk container has a removal opening with Gasab guide tube 14 through which the granulate container with granules 4 can be removed.

At the lower end of the sheet metal pocket 3 of the condenser, a condensate drain pipe 9 is arranged, which mun det in the condensate container 6 . This has a liquid volume that is 0.2 to 3 times the kilogram of kiln feed, ie with a kiln feed of 30 kg, the container has a liquid volume of 6 to 90 l, preferably 30 l.

At the lower end of the condensate container 6 , a drain valve 15 is attached, through which the condensate container including the adsorbent introduced into the condensate container 6 , such as dolomite or smelting furnace slag, can be removed and new granules can be introduced.

In the condensate container 6 , a level switch 10 is arranged, which gives a contact when reaching a certain level of water. At the side of the condensate container 6 , a liquid speed pump 7 is arranged, which is connected to a line 8 with the upper part of the tin pocket 3 of the condenser.

This connecting line 8 has a branch with the solenoid valve 12 and a condensate drain 13 , which is electrically connected to the level switch 10 .

In a special embodiment, the condenser in the sheet metal pocket 2 is provided with cooling fins 16 on the outer surface and the sheet metal pocket 3 is provided with liquid and gas baffle plates 17 on the inside.

The device according to the invention is optionally a kata lytic exhaust air cleaning to remove the organic, odor capable components of the gas downstream.

A special embodiment shows the conditions in a special, optimally functioning arrangement. An electrically heated kiln from Nabertherm with a capacity of 150 l type N 150 is filled with 30 kg of firing material. After firing, the good weighs 27.1 kg. There are 2.8 kg of water in the separating container after the condensate drain pipe 13 . The sheet metal pockets 2 and 3 have a geometric dimension of 0.2 m width and 0.75 m length.

The separating tank 6 has a volume of water up to the level switch at the switch 10 of 30 liters. The circulation pump 7 has a delivery rate of 0.5 m3 per hour and a delivery height of 2 meters.

Reference list

1

Connection pipe between the furnace and the device

2nd

Tin pocket of the condenser furnace side

3rd

Tin pocket with side facing away from adsorber furnace

4th

Adsorber box with adsorber material

5

Perforated plate or sieve

6

Condensate tank with condensate and adsorber material

7

Condensate delivery pump

8th

Connection pipe between feed pump and condenser

9

Connection pipe between condenser and condensate tank

10th

Level switch

11

electrical connection line between level switch and solenoid valve

12th

Solenoid valve for excess condensate drain

13

Excess condensate drain

14

Lid and gas discharge from the condenser to the catalytic cleaning system

15

Drain valve for the condensate container

16

Cooling fins on condenser

17th

Liquid and gas baffles

Claims (7)

1. Device for the separation and condensation of exhaust gases from electrically heated chamber furnaces with a combination of cooler and adsorber, characterized in that the cooler consists of at least 2 cooling chambers, which are connected on the furnace side above and on the connection side of the two chambers below, in the side facing away from the furnace, the sheet metal pocket 3 has a bed of adsorbent at the upper end and is connected via pump and connecting line to the space below the adsorbent with a liquid container which contains a neutralizing agent in addition to water. 2. Device according to claim 1, characterized in that the Ratio of material entered in the furnace and the Cooling surface of the condenser 0.4 to 4, preferably 2 dm2 / kg Brenngut is. 3. Device according to claim 1, characterized in that the Ratio of mass entered in the furnace for firing and the Liquid supply quantity in the liquid container the ratio 0.2 has up to 2, preferably 1 kg of liquid per kg of firing material in the furnace. 4. Device according to claims 1-3, characterized in that the condenser is equipped with cooling fins on the outside.   5. Device according to claims 1-3, characterized in that the part of the condenser designated 3 has in the inner liquid baffles. 6. Device according to claims 1-3, characterized in that the liquid container 6 is provided with a drain at the lower end, which allows both emptying of the liquid and the emptying and filling of the neutralizing agent. 7. Device according to claims 1-3, characterized in that the liquid container 6 is equipped with a level switch which is electrically connected to a solenoid valve in the circulation line 8 and controls the level of the liquid in the container.