DE2333406C3 - Device for removing ammonia from the exhaust air of copier machines - Google Patents

Description

corridor 13 again leaves room 8 and over the line 14 is introduced into the absorption interior 2 at the bottom. The water and exhaust air lines 9 and 12 are attached to the upper and our room 7 and 8 so that water and exhaust air as long as possible Have a pre-cooling section before they leave rooms 7 and 8 again.

The exhaust air flows through the absorption interior 2 provided with the packing 5 from above towards the trickling water. The water enriched with ammonia leaves the absorption interior 2 via the outlet 15 located on the floor and after passing a U-shaped pipe 16 in collected in a container, not shown. The cleaned exhaust air leaves the absorption interior 2 via the gas outlet 17.

The cooling jacket space 3 is connected to a coolant circuit 18 in the coolant circuit 18 there is a refrigeration unit 22 consisting of a compressor 19, a condenser 20 and a refrigeration valve 21.

1 sheet of drawings

Claims (2)

Patent claims: 1. Apparatus for removing ammonia from the exhaust air of copiers with one of a A packed or tray column existing absorption vessel, at the bottom of which there is an exhaust air inlet, which is connected to the development chamber, and an exit for the ammonia enriched one Absorbents are attached, and at the upper part of an absorbent supply line and a gas outlet for the exhaust air depleted in ammonia are attached, characterized in that that the absorption column (1) consists of three coaxially arranged spaces, the Absorption interior (2) around which one is attached to a refrigeration unit (22) connected cooling jacket space (3) and then an outer jacket space (4) through a partition (6) running in the cross-sectional direction into an upper (7) and a lower (8) space is separated, the upper space (7) as a pre-cooling section for the absorbent and the lower space (8) as a pre-cooling section for the one coming out of the developing chamber Exhaust air are formed. 2. Apparatus according to claim 1, characterized in that the absorbent is water. 30th The invention relates to a device for removing ammonia from the exhaust air of copier machines with an absorption vessel consisting of a packed or tray column, at the bottom of which a Exhaust air inlet, which is connected to the development chamber, and an outlet for the ammonia enriched Absorbents are attached, and at the upper part of an absorbent supply line and a gas outlet for the exhaust air depleted in ammonia are installed. In such a known device (DT-OS 20 23 166) a nozzle is arranged over packing in an absorption vessel, which over a feed pump is directly connected to a storage tank of the absorbent chemical. As chemicals become solutions of aldehydes or aqueous solutions of mineral acids, organic acids and the like, such as Acetic acid. The exhaust air flows from the bottom up through the filler bodies which are sprayed with the chemical where the exhaust air for the most part chemically reacts with the chemical. The consumed, converted Chemical is collected in a tank. Because the ammonia is not yet completely absorbed is, a second, wider room with an acidic or basic one is above the space filled with random packings Deodoriser arranged, which can also absorb odor components. the Exhaust air is passed through the room filled with the deodorant after it has been filled with the packing left the filled room. In particular by the second, wide room, which is because of the too incomplete absorption of the ammonia gas from the exhaust air in the first one filled with packing Space is required, the dimensions of the entire device are considerable when they are combined should have sufficient performance with a conventional copier. An installation of such a device in copiers is therefore difficult, if not impossible with given housing dimensions. In addition, the device is set up to work with chemicals with ammonia react chemically. The supply of fresh chemicals must therefore be renewed from time to time, as well the chemicals used must be renewed. The invention is therefore based on the object of providing a device for removing ammonia To create the exhaust air from copier machines that are used to clean larger quantities of exhaust air as space-saving as possible and is compact. The device should nonetheless extract the exhaust air in the smallest of spaces with the exception of the smallest residual amounts free from ammonia. According to the invention, this object is achieved by the features specified in the main claim. This space-saving arrangement in which a filling jacket is arranged around the absorption interior is, work is carried out at low temperatures, at which the ammonia is well absorbed. Because of this the absorption column can be made shorter. A more effective absorption is also achieved by the Outer jacket space achieved in its lower part as a pre-cooling section for the development chamber incoming exhaust air and serves in its upper part as a pre-cooling section for the absorbent. Through this the temperature in the interior of the column can also be kept lower. With this one small held device for removing ammonia can due to the good effect as an absorbent only water can be used. This is advantageous because of the ammonia water produced the ammonia can be released again for development by heating. This creates that is, fresh development medium and largely neutral water. Water is therefore preferably used as the absorbent, since the ammonia is recovered from it can. Substances such as lithium chloride can be found in the water. Ammonium rhodanide, ammonium nitrate i.a. added, which promote the absorption of ammonia. The water is preferably cooled down to the vicinity of the water freezing point. In addition, in the absorption column or in the absorption vessels at a pressure above atmospheric pressure Pressure, e.g. B. 1.5 atü, be worked. The device according to the invention is explained below with reference to the drawing, which shows it in cross section indicates: An absorption column 1 consists of the absorption space 2, the cooling jacket space 3 and the outer jacket space 4. The cooling jacket space 3 and the outer jacket space 4 are coaxial around the absorption interior 2 arranged. The absorption interior is filled with packing 5. The outer jacket space 4 is through a partition 6 extending in the cross-sectional direction into an upper space 7 and a lower one Room 8 separate. The upper space 7 is provided with the water supply line 9 and serves as a pre-cooling section for the water. The Pre-cooled water leaves the room 7 again at the exit 10 and is via the line 11 above into the Absorption interior 2 initiated. The lower space 8 is provided with an exhaust air supply line 12, which is from the Not shown in the drawing development chamber of the copier comes. The lower room 8 serves as a pre-cooling section for the exhaust air, which is