DEN0005600MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: May 31, 1952

GERMAN PATENT OFFICE

The invention relates to a device for preventing the ingress of false air on the Inlet end of rotary kilns. This ingress of false air is particularly annoying, because this worsens the temperature of the exhaust gases and the furnace draft. Furthermore, will also the result of the continuous emissions tests on which the furnace control is based falsifies, which in turn causes incorrect metering of the combustion air and thus the efficiency the system deteriorates. You must continue with the penetration of larger amounts of false air A higher draft can be maintained at the furnace inlet by the exhaust fan, which in turn increases the penetration leads to further air leakage.

Attempts have already been made to prevent air infiltration through the best possible connection of the inlet of the rotary kiln. with the fixed To prevent furnace parts and the exhaust gas discharge, however, these attempts do not have to led to a fully satisfactory result.

It is also already known that in a fixed furnace part, for example in the exhaust pipe, to surround protruding inlet end of the furnace with a housing from which the through the Gap between housing and rotary kiln

609 617/331

Claims (2)

N 5600 IVc / 80 c outside air is extracted. For better sealing, an older proposal of this type provided a seal in the housing that seals the suction space inside the housing from the gap between the stationary furnace part and the rotary kiln, the greater part of which penetrates into the housing from the outside Fresh air is sucked off and only the smaller part of the fresh air passes through the mentioned seal into the furnace inlet or the fixed furnace part. In this way it is achieved that no exhaust gases are sucked off together with the fresh air and lead to an annoying dust build-up in the air in the vicinity of the furnace. It is also known to prevent false air infiltration in rotary kilns to surround the rotary kiln in the vicinity of the fixed kiln head with a housing in such a way that a narrow gap remains between the housing and the kiln head, through which the outside air through a suction fan or the like Housing is sucked in or out of this housing. In contrast to this prior art, the inventor has set himself the task of preventing any penetration of fresh air at the furnace inlet end, which is surrounded by a housing connected to an exhaustor or the like and kept under negative pressure, by providing and so arranged a gas pressure regulator and it is set so that it keeps the negative pressure prevailing in the housing and the exhaust gas pressure prevailing in the exhaust pipe at the same level. As a result, proper control of the furnace is changed on the basis of a precise analysis of the composition of the furnace, which is not due to the ingress of fresh air. Exhaust allows. A throttle element is preferably provided in the suction line of the housing, which throttle element is controlled by the gas pressure regulator in accordance with the pressure difference prevailing in the housing and in the exhaust gas line. . In order to achieve a good seal between the housing surrounding the rotary kiln and the rotary kiln rotating therein, a sliding labyrinth seal can be provided. As a result of the new design, any penetration of false air between the rotary kiln end and the fixed kiln part into the exhaust gas duct is prevented. This firstly ensures that the exhaust gas test carried out in the exhaust gas system by continuous sampling gives an unadulterated picture of the combustion process. Waiter prevents the previously occurring temperature reduction of the exhaust gases due to false air or an undesired escape of exhaust gases at the furnace inlet. Some of the special precautions previously required to seal the rotary kiln transition can be saved with the new arrangement. The invention is illustrated in the drawing in an exemplary embodiment schematically in longitudinal section. . The end of the rotary kiln 1 is connected to the stationary furnace part 3 via the loose seal 2. The transition from the rotary kiln to the exhaust gas duct is surrounded by a housing 4 with a labyrinth seal 5. At 6, the housing is connected to the fixed exhaust gas discharge 3 in a gas-tight manner. The space enclosed by the housing 4 is kept at negative pressure via a suction line 7 through an exhaustor 8. A gas pressure regulator 9, 12, which is connected by lines 10 and 11 on the one hand to the housing 4 and on the other hand to the exhaust gas duct 3, controls the suction power of the exhaustor 8 via the throttle element 13 so that the same pressure prevails in the cavity of the housing 4 as in the Room 3. PATEKTANSPKi) CHE: 1. Device for sealing the inlet end of a rotary kiln, which is surrounded by a fixed housing, which under Negative pressure is maintained in order to penetrate through the gap between the housing and the rotary kiln To prevent air from entering the furnace, characterized in that a gas pressure regulator is provided and arranged and adjusted so that it is the prevailing in the housing The negative pressure and the exhaust gas pressure in the exhaust pipe are the same Height holds. 2. Apparatus according to claim 1, characterized by one in the suction line (7) of the Housing (4) seated throttle member (13), the - From the gas pressure regulator (9) according to the one prevailing in the housing and in the exhaust pipe Pressure is controlled. Considered publications:
German patent specifications No. 378364, 431987. 1 sheet of drawings 605 617/331 8. 56