DK167167B1 - METHOD AND APPARATUS FOR SHOULDING THE SLAUGHTERED FREEDOM, EX. CHICKENS - Google Patents

Description

in DK 167167 B1

The present invention provides a method for scalding slaughtered poultry, e.g. chickens, and of the species specified in the preamble to claim 1.

5 In connection with the slaughter of poultry, the slaughtered animals, prior to the picking operation, undergo a so-called scalding treatment with hot water to soften the hair follicles of the feathers and to possibly obtain a general degreasing of the slaughtered poultry.

10 In practice, scalding is carried out by passing the slaughtered chickens, suspended in a hanging conveyor, downwards and passing through elongated vessels with hot water having a temperature of 48 ° 61 °.

In order to facilitate the immersion of the hanging animal bodies, which still have feather cover - and therefore have a relatively large support surface, it is known to use various methods to get the poultry to quickly immerse in the school water.

For example, it is known to arrange a strong downward flow of water in the vessels by pumping out water through suction openings at the bottom of the vessels by means of a powerful pump and replenishing along opposite sides of the vessels. so that the hot water is continuously recycled. passed past heat exchangers.

25

By another known method of scalding, central zones are created in the school vessels with less carrying capacity for the chicken carcasses - by supplying compressed air through central air nozzles which are spaced apart along the bottom of the school carts. The carrying capacity of the water1 is thereby reduced along a center zone of the vessels by admixing air, ie off the transport path of the chickens.

From the disclosure of U.S. Patent No. 2,994,909, a method of scalding poultry scalding is known in which the downward flow in the shoe The bucket is produced by blowing air upwards along the outer walls of the scoop. at the outside of the heat exchangers.

DK 167167 B1 2

However, these known scalding methods have proved difficult to control, which in case of excessive heating of the chickens may cause the chickens' breast meat to simply boil; while in the case of a less effective scalding it can cause the chicks to stay for a relatively longer time in the school trays, ie. that longer and more space-consuming school trays must be used, which means relatively higher construction costs - as well as large operating costs, because well-known storage systems have a large energy consumption for operating powerful water pumps and air compressors, respectively.

The invention has for its object to provide an improved method for scalding poultry slaughter, which enables quick and efficient scalding by simple apparatus technical measures - and even at reduced plant and operating costs.

The method according to the invention is characterized in that the central, downward flowing stream in the water in the colander is effected by blowing air outwards / upwards along the side of the heat exchangers facing the chickens in such a way that at opposite inside of the heat exchangers between these and the chicken bodies form a strong upward flow of mixed air and water. Ie that the central downward flow - like a longitudinal flow vortex - is formed by the outer upward flow continuing inwardly along the water surface and gathering along a longitudinal center zone, whereby the downward flow is further amplified by the inward flow of air upwardly along the heat exchangers are simultaneously conveyed water outward / upward from a central, longitudinal bottom zone of the vessel. In this way, by simple apparatus technical measures, rapid immersion of the chicken bodies in the colander and an efficient and at the same time gentle scalding can be achieved, as the upward flow of air bubbles in the water between the heat exchangers and the chicks causes the chicks to be protected from direct heat radiation from the heat exchangers. i.e. that the said problem of partially boiling the breast meat of the chickens can be avoided. And by the continuous flowing movement of the water inside the school vessel itself along with the heat exchangers, good and almost loss-free utilization of the heat energy is also achieved. A further reduction of the energy consumption in the scalding process can be achieved simply by extracting the air injected into the scalding vessel from the chamber over the scalding vessel and the hot, moist air being recirculated and used for re-inflating. This is possible because a fan is used to extract the hot, 10 humid air from said chamber and to re-inflate the air at the bottom of the school vessel.

Tests have shown that an optimum flow-forming effect is achieved in the water in the school vessel by injecting said outward / upward air streams at an angle of 10 ° 20 ° with the preferably vertical heat exchangers.

The invention also relates to an apparatus for scalding slaughtered poultry and of the kind specified in the preamble of claim 4 for carrying out the method according to the invention, which apparatus is characterized in that said air supply nozzles extend substantially along the entire length of the plate heat exchangers and are located thereon. thereof facing the chicken bodies - and off the lower edge portions of the plate heat exchangers. By simple measures, hereby a strong upward air flow can be produced along both inner walls of the plate heat exchangers, thereby producing a strong downward, central suction water flow longitudinally of the school vessel and a heat insulating air barrier between the inside of the heat exchangers and chickens. .

Conveniently, the apparatus according to the invention is designed such that the elongated air supply nozzles are made of smooth stainless steel pipes, in which elongated slots are formed along a generator and the smooth pipes are mounted between manifolds connected to the pressure side of a fan. associated with a suction opening in the ceiling of said chamber on the intake side. Ie that the nozzle tubes can be manufactured from standard tubes in which the elongated slots can conveniently be formed by laser cutting.

In order to obtain an easy and convenient adjustability, said smooth nozzle tubes are pivotally mounted in said manifolds in such a way that said slots can be angled to rotate with respect to the inside walls of the plate heat exchangers by turning the nozzle tubes. And preferably, said smooth nozzle pipes are additionally mounted in a readily removable manner in protruding pipe sleeves of said manifolds.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail in connection with the drawing, in which: - FIG. 1 shows a cross section through an embodiment of an apparatus according to the invention; FIG. 2 shows a preferred mounting form of the nozzle tubes of the apparatus according to the invention, and FIG. 3 shows an end portion of a nozzle tube for the apparatus according to the invention.

The FIG. 1, the apparatus 2 shown consists of a heat-insulated school decar 4, which at opposite insides 6 has vertical heating surfaces 8 of water-filled radiators 10. The school vessel 4 is filled with hot water 12, where through poultry, e.g. chickens 14, are successively led suspended in the legs of a hanging conveyor 16. This feed runs along the ceiling of an upper chamber 18 which interlocks the school trough 4 upwards.

The trolley 4 is provided at the lower longitudinal edges of the radiators 10 on each side with nozzle tubes 20 with longitudinal nozzles 22 in the form of slots 24 (Fig. 3) formed in the nozzle tubes 20, which preferably consist of standard stainless steel tubes 20. steel, by laser cutting. The nozzle tubes 20 are mounted between manifolds 26 by means of tube bushes 28 extending therefrom, in which opposing end portions 30 of the nozzle tubes 20 are sealed by means of O-rings 32 held in place in outer holding grooves 34 formed in the end portions. 30 (Fig. 3). Ie the nozzle tubes 20 can be rotated in the pipe bushes 28 for angular adjustment of the nozzle slots 22, 24 relative to the inside of the radiators 10.

The nozzle slots 22/24 are preferably set such that the air jets therefrom are directed upwards / outwards at an angle of approx. 10 ° - 20 ° with respect to the inner sides 6 of the vessel 4 and 10 of the radiators 10, respectively, as it has been shown by experiments to give optimum flow conditions in the school vessel 4 when the nozzle tubes 20 - as shown are located quite close to the underside of the the radiators 10f i.e. that the angle between the air jets and the inside of the radiators 6 is of course determined by the specific distance between nozzle pipe 20 and radiator 10.

Manifold 26 is supplied with air from a fan located on top of chamber 18, which is provided with suction air via a suction opening in the ceiling of chamber 18. the air 20 being blown up / out along the inside 6 of the radiators 10, and which bubbles up along the heat surfaces 8 to the chamber 18, is recirculated and reused for recirculation via manifold 26 and the nozzle slots 22, 24.

25 The strong upward / outward air jets from the nozzle tubes 20 entrain water upwards / outwards, so that in the tub 4, two circulating streams are formed, which result in a strong downward central suction flow next to the transport path for the chickens 14, by suction quickly and effectively immersed in the hot water.

But in addition, the strong upward air flows along the inside of the radiators 10 act as an insulating air barrier which has the very beneficial effect of protecting the chickens 35 from direct commodity radiation from the radiators 10, thus avoiding the said problem of part of the chickens, eg. the breast meat is partially cooked.

Claims (7)

1. Method of scalding poultry slaughtered, e.g. chickens in which the body of the chickens (14) suspended in a hanging conveyor (16) is successively passed through hot water in a school vessel (4) covered with a substantially closed chamber (18) along which the ceiling hanger conveyor (16) is guided and at which, along the transport path of the chickens (14), preferably in a central zone through the school trolley (4), a strong downward flow in the water is heated by plate heat exchangers (10) located in the school trough (4) predominantly vertical at each side of the chickens path through the water, characterized in that the central downward flow of water in the school trough (4) is effected by blowing air outwards / upwards along the side 15 of the heat exchangers (10) facing the chickens (14) in such a way that a strong upward current of the heat exchangers (10) between them and the chicken bodies (14) is formed by mixed air and water. Process according to claim 1, characterized in that the air blown into the sump (4) is extracted from said chamber (18) over the sump (4) and that the hot, moist air is recirculated and used for recirculation. Method according to claim 1, characterized in that the outward / upward air flows are blown at an angle of between 5 ° - 40 °, preferably between 10 ° - 20 °, with the inner wall (6.8) of the preferably vertical heat exchangers (10). Apparatus for scalding slaughtered poultry by the method of claim 1 and arranged for coordinated cooperation with a hanging conveyor (16), wherein slaughtered poultry, in particular chickens (14), are suspended in the legs successively against the apparatus comprising a device. water-filled school trays (4) covered by a generally closed chamber (18) comprising, along a ceiling, a section of said hanging conveyor (16), which apparatus comprises heating means which are positioned predominantly vertically in the vessel (4) at each side of the path of the chickens through the water, consisting of plate heat exchangers (10) and means in the form of elongated air supply nozzles to effect a downward flow in the water in the school vessel, characterized in that said air supply nozzles (20) extend substantially along the entire length of the plate heat exchangers (10) and are located on the side thereof facing the chicken bodies - and adjacent to lower edge portions of the plate the heat exchangers (10). Apparatus according to claim 4, characterized in that the elongated air supply nozzles are made of smooth stainless steel pipes (20), in which elongate slots (22) are formed along a longitudinal member and the smooth pipes (20) are mounted between manifolds (26) connected to the pressure side of a fan connected on the suction side to a suction opening in the ceiling of said chamber (18). Apparatus according to claims 4 and 5, characterized in that said smooth nozzle tubes (20) are rotatably mounted in said manifolds (26) in such a way that the slots (22) can be angled in rotation by the nozzle tubes (20). relative to the inside walls (6, 8) of the plate heat exchangers (10). 25 Apparatus according to claim 6, characterized in that said smooth nozzle pipes (20) are mounted in a readily removable manner in protruding pipe bushes (28) of the manifolds (26).