DE1217763B - Process and system for removing malodorous gases during the processing of fish material - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

A23k

German class: 53 g - 4/02

Number: 1217763

File number: A 36997IV a / 53 g

Filing date: March 18, 1961

Opening day: May 26, 1966

In the manufacture of "fishmeal" the general procedure is that the raw fish is first for the purpose of coagulating and partially sterilizing the protein substances contained in the fish heated in a closed container and then the heated by compressing the Solid components obtained from the material dries in a closed container, followed by crushing of the dried material to flour.

During the preparation of the raw fish, also during the drying process, foul-smelling gases that are very annoying not only in operation, but also in its surroundings.

Attempts have been made to remedy this problem by that the foul-smelling air was washed with water, thin chlorine or soap solutions. However, since the amount of air involved is very large, it becomes necessary to deodorize the air Apparatus very large and complex and therefore expensive to operate if it is effective should.

It is also known to burn the foul-smelling air in special deodorizing ovens, what meanwhile, a considerable increase in the fuel consumption of the product donation site has the consequence. Man has also tried the malodorous air as combustion air in the company's boiler system to use, however, has again deviated from this, because the air volumes in question for the boiler requirements were too large and the profitability of the firing was therefore so bad or only that Deodorization of part of the amount of air was possible.

Finally, from the USA patent specification 1820 986 a method for drying fish meal is known, in which the exhaust air withdrawn from the drying device is fed into one of the drying devices in the circuit fed back and divided into a further stream fed to the deodorization device (oven) and the latter stream is passed through a condenser prior to combustion. The at The air returned to the drying device in this process is relatively high Moisture content, so that their drying effect is limited. If you wanted an enrichment here of the foul-smelling gases in the circulating air, then that would have to be returned to the drying device The proportion of exhaust air must be heated to a correspondingly high level before entering the drying facility. One however, such heating is due to the nature of the fish material to be treated

Procedure and system for removal
malodorous gases during processing
of fish material

Applicant:

Aktieselskabet Atlas, Copenhagen

Representative:

Dr. D. Louis, patent attorney,:

Nuremberg, Keßlerplatz 1

Named as inventor: -> *

Otto Bertel Christenseh, K0ge (Denmark)

Claimed priority:

Denmark March 21, 060 (1073);

Limits are set / Apart from that, such a heating to improve the drying effect of the air supplied to the drying device makes the treatment process uneconomical, even if the exhaust gases coming from the deodorization device were used for this purpose. '"'
The invention is based on the object

35 'an improved method for the processing of To create fish material, especially the malodorous gases on cheaper, simpler and more effective Way can be removed than was previously the case. In solving this problem the invention relates to a method for removing malodorous gases during processing of fish material, in which the raw fish material is heated in a closed container and optionally pressing and then drying in a closed drying container is subjected, the removed from the drying container containing the malodorous gases and moisture-laden drying medium is divided so that a part thereof is fed back to the drying container and the remainder of the deodorization. The solution to the The task of the invention is that the dry

609 570/172

Claims (1)

kenmedium can be seen before its division of a condensation, via which part of the exhaust air is subjected to deodorization and with the air from the closed sierung is discharged, and that in the dry-heating container and the exhaust air line leading away from the drying reservoir is preceded by a valve Transport and treatment stages of the is seen through which of the plant the exhaust air of the Fish material is mixed. In the case of the 5 heating container according to the invention and from the individual transgems The process thus involves the condensation of the port and treatment stages of the fish material, one of them exhaust air coming from the drying device in In contrast to the press in the aforementioned American press, which is located in a closed room, watch Patent specification described method is already performed. takes place before the division into the two partial flows. The invention is hereinafter referred to with reference to This difference is based on the essential progress the drawing explains in more detail. It shows of the invention over the known method. F i g. 1 in a schematic representation an execution If the condensation of the exhaust air before its distribution example for part of the inventive made, then the drying facility, consisting of drying container and its tang again air supplied in the circuit naturally 15 air circuit, and a much better drying effect than if FIG. 2 also schematically another embodiment such condensation behind the junction in this example. to the deodorization device supplied in FIG. 1 denotes a rotating dry-stream stream he follows. The method according to the invention, which is equipped with a steam jacket. the Ren the exhaust air of the drying container before the ao to be dried animal substances such. B. fish material, Distribution of the exhaust air Moisture in the condenser is fed through a pipe 2 and withdrawn is, can always a relatively let the drying drum by a departure size Share of the exhaust air back in the circuit of the tang 3. The air from the drying drum is through Drying device are fed. This has fed to a pipe 4 to a condenser 5 The result is that di & circulating air strongly with the bad smell ag and from there via a fan 6 through a pipe earth Can enrich gases. As a result, the line 7 can be returned to the drying drum. In the Deodorization process when using the inven- pipe 7 is an adjustable valve 8 for discharge according to the invention The method is particularly economical to carry out part of the circulating air for deodorization. activated. The pipe 4 stands with Another advantage of the inventive method 30 in conjunction with an adjustable valve 9, by means of which driving against the prior art consists of other parts of the system, z. B. from the stove and in that, according to the invention, the supply of the same press of the system, introduced air if exhaust air laden with malodorous gases can be emitted. the transport and transport equipment upstream of the drying process. 2 denotes 10 with a drying drum Treatment stages of the fish material in the circuit 35 of a supply line 11 for material to be dried run is provided. and a discharge line 12 for dried material When carrying out the verrial according to the invention. The drying takes place by means of warm air Driving depends on the amount of the circuit to a pipe 13, and the drying air leaves Purpose of deodorization to be removed air the drying drum 10 through a line 14, from partly on the amount of during the treatment of 40 of them a capacitor 15 and then through Foul-smelling gases produced by fish material, a pipe 18 is fed to a blower 19, partly on the way in which the air through a pipe 16 is used for heat preparation of animal substances takes place. As an example exchanger 17 supplies. The pipe 14 stands with it is stated that there is an adjustable valve 21 in connection with the manufacture of fish flour, where a steam cooker is used to heat the raw 45 as described in connection with F i g. 1 declares air of Fish and a steam dryer for drying the other parts of the system can be supplied, Fish material is used, usually expedient and the pipeline 16 is veristed with a valve 20, 20 to 60% of the circulating air for Deodori- tied, through which the part to be deodorized to be taken. If the deodorization takes place, air is removed. by incineration in the combustion chamber of the product- 50 If the drying is carried out by means of a direct supply was- site, then good results with a demolition are air, then spray drying can be acquisition of 50% of the circulating air available. in which case the drying drum The subject of the present invention is also the shape of an upright, in the usual way from a system for implementation - the above-described container formed, which has the air and the process to be NEN. The invention is based on the drying material supplied at the top, while known systems for the preparation of fish material are based on the dried material and the trokrial used, in which a closed heating air is discharged from below,
container for the raw fish material and a closed drying container for the heated fish material claims:
and if necessary between the warming and 6p - Drying container a press for separating the malodorous substances in 1. Process for removing malodorous the heated fish material contained liquid gases is provided during the processing of fish, the exhaust air of the drying container material, in which the raw fish material a leads to a condenser and a fan, from heating in a closed container to which a pipeline to the drying container 65. as well as, if necessary, a pressing and feeding back. The system according to the invention is characterized by a drying in a closed, that in the downstream of the condenser senen drying container is subjected, with pipe an adjustable valve upstream of the one removed from the drying container, which containing odorous gases and laden with moisture drying medium divided in this way that part of it is returned to the drying container and the remaining part of the deodorization is supplied, characterized in that the drying medium is subjected to a condensation before the division and with the air from the closed heating container and the one upstream of the drying process Transport and treatment stages of the fish material is mixed. 2. Plant for performing the method according to claim 1 with a closed heating container for the raw fish material, a closed drying container for the heated fish material and one if necessary provided between the heating and drying container press to separate the in the heated fish material contained liquid, whereby the exhaust duct of the drying container to a condenser and a fan leads from which a pipe to the drying container returns, characterized in that in the downstream of the capacitor (5, 15) Pipeline (7, 16) an adjustable valve (8, 20) is provided through which a part of the Exhaust air is discharged for deodorization, and that in the from the drying container (1, 10) leading away Exhaust air line (4, 14) a valve (9, 21) is provided, via which the system the exhaust air of the heating container and from the individual transport and treatment stages of the Fish material, including any provided and in an enclosed space arranged press, is fed. Considered publications:
German Auslegeschrift No. 1057 431;
German patent application B 30724 IVa / 53 g (published on June 23, 1955);
British Patent No. 272,663;
U.S. Patent No. 1,820,986. 1 sheet of drawings 609 570/172 5.66 © Bundesdruckerei Berlin