KR100864676B1 - Rendering system - Google Patents

Abstract

A rendering system used in the recycling of slaughter or the preparation of corrugated cardboards is provided to improve the total heat efficiency of a rendering system remarkably. A rendering system comprises a boiler(10) forming the steam of high temperature; a steam room(20) where the steam is supplied from the boiler; a heat treatment room(30) which heats the injected object with the heat of the steam; an isolated water supply tank(40) which is arranged at the lower part of the steam room; a water supply pump which supplies the water of the isolated water supply tank into the boiler; an ejector(80) which is installed on the steam supply pipe between the boiler and the steam room; and a re-vaporization pipe(43) which is installed at the upper part of the water tank and is combined with the low pressure-side inlet of the ejector, wherein the boiler-side steam supply pipe(71a) is combined with the high pressure-side inlet of the ejector and the steam room-side steam supply pipe(71b) is combined with the outlet of the ejector.

Description

Rendering System

1 is a block diagram illustrating an example of a general rendering system.

2 is a block diagram of a conventional rendering system of the improved form.

3 is a block diagram of a rendering system according to the present invention;

 Figure 4 is a principle diagram of the ejector applied to the present invention.

<Explanation of symbols for main parts of the drawings>

10: boiler 20: steam chamber

30: heat treatment chamber 40: sealed water supply tank

80: ejector 71a: boiler side supply line

71b: Steam chamber supply line 43: Flash steam line

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rendering system, and more particularly, to an improvement of a rendering system used for separating and recycling fats and oils of slaughter waste using high temperature steam heat.

Since the slaughter waste contains a large amount of fat, that is, oil, it is not only an environmental pollution source but also wastes recyclable resources. Recently, oil, cosmetics, etc. have been separated from the slaughter waste. Increasingly, solids that are used as raw materials for food and from which oil is removed have been recycled into livestock feed.

The rendering system used to effectively separate the fats and oils in the slaughter wastes does not directly heat the slaughter wastes, but rather heats the steam from the boiler to the vessels containing the slaughter wastes. As a result of the heat aging and separation, a rendering system which is generally used currently includes a boiler 1 for forming high temperature steam and steam supplied with high temperature steam generated in the boiler, as shown in FIG. The chambers 2, 2 ', the heat treatment chambers 3, 3' where slaughter waste is introduced and aged by the heat of the steam inside the steam chamber, and the steam traps 4, 4 'allowing only condensate to be discharged from the steam chamber. ), The condensate discharged from the steam trap is collected, the drain tank (5) supplied with supplemental water from the outside, and the condensate collected in the drain tank It consists of a supply pump 6 for supplying to the boiler.

The condensed water fed to the boiler 1 by the feed water pump 6 is heated by the burner and supplied to the respective steam chambers 2 'through the headers 1a, 2a, 2a' in a high pressure superheated steam state. The heat treatment chambers 3 and 3 'are formed in the form of a double vessel inside the steam chamber so that the inlets 3a and 3a' and the outlets 3b and 3b 'protrude out of the steam chambers 2 and 2'. By being uniformly heated as a whole by the heat of the steam supplied from the steam chamber, the fat or oil in the slaughter waste introduced into the heat treatment chamber 3 is gradually melted and separated from the solid content without boiling or oxidizing.

The steam supplied to the steam chambers 2 and 2 'is condensed as the temperature decreases as heat is supplied to the heat treatment chamber 3, thereby becoming a wet saturated vapor state. The steam traps 4, 4 'installed in the lower part of the seal are collected.

The steam trap 4 generally uses a bucket or float type. When a predetermined amount or more of condensate enters the steam trap, the bucket or float rises due to the buoyancy of the condensate and causes the valve 4a of the steam trap. 4a ') is opened so that only the condensate is discharged to the drain tank 5.

Condensate discharged from the steam trap (4) to the drain tank (5) is lowered in pressure, part of the evaporation into the atmosphere, the remaining condensate remaining in the water supply tank is mixed with the supplemental water supplied from the outside through the feed water pump (6) Supplied to the boiler.

In general, the replenishment water is supplied by separately installing the replenishment water tank 7 and the replenishment water supply pump 7a, as shown in FIG. .

On the other hand, the water vapor in the slaughter waste generated in the heat treatment chamber during the treatment process is liquefied through the condenser through which the cooling water is circulated, and the waste water is treated. When the slaughter waste is heated and aged for 3 to 4 hours in the heat treatment chamber, the outlets 3b and 3b 'are discharged. ), And then, only the fats and oils are separated through a hopper formed with a filter net and transported to a storage tank, and the remaining solids are processed through a grinder, fats and oil press separators, impurity separators, and the like through feed conveyors. Used.

As described above, the rendering system using the heat of the high temperature steam supplied from the boiler is applied to a drying operation such as an adhesive drying process in the manufacture of corrugated cardboard. In this case, the steam chamber is formed in a tunnel shape and the heat treatment chamber is formed in the inner space. And a conveyor belt through which the corrugated cardboard to be dried is loaded and passed through the heat treatment chamber is configured to dry the adhesive of the corrugated cardboard.

By the way, in the conventional rendering apparatus as described above, the steam trap is provided so that the steam inside the steam chamber is not discharged, that is, the latent heat contained in the steam does not escape to the outside of the steam chamber. Since a considerable amount of condensate discharged to the evaporation to the atmosphere is consumed, there is a problem that the energy efficiency is extremely low.

That is, the steam supplied to the steam chamber in a saturated steam state at high pressure, for example, a pressure of about 8 kgf / cm 2 and a temperature of about 170 ° C. from the boiler is partially phased into a liquid phase as heat is lost to the heat treatment chamber. In this case, only the condensate of the liquid phase is discharged to the drain tank through the steam trap. However, since the drain tank is open to the atmosphere, the condensate discharged to the drain tank has a low pressure. It rapidly evaporates and evaporates to a wet vapor state under atmospheric pressure, that is, a wet vapor state of about 100 ° C. at a saturation temperature at a pressure of about 1 kgf / cm 2, so that a considerable amount of thermal energy of the discharged condensate is re-evaporated in the atmosphere. There is a problem that the loss to the middle, thus the energy efficiency is extremely low, the working environment is extremely poor by the steam discharged.

In addition, a large amount of water is required because the replenishment water must be continuously supplied as much as the amount of steam lost to the atmosphere, and since a large amount of replenishment water at room temperature is mixed and water is supplied to the boiler in a state where the temperature is reduced, There was a problem in that fuel was consumed, and there was a problem in that impurities in the water were continuously formed on the inner wall of the boiler pipe to easily reduce heat transfer efficiency.

In addition, since the flow of steam supplied to the steam chamber is intermittently made by opening and closing the valve of the steam trap, that is, the time limit for the inflow of the hot steam supplied from the boiler to the steam chamber is large, thus requiring a lot of time for the treatment of waste. In addition, the maintenance and replacement of the steam trap takes a lot of cost and time, there was a problem that the productivity and economic efficiency is extremely low.

In order to solve the above-mentioned problems of the conventional rendering system, the present inventors render efficient use of heat energy and at the same time minimize the water replenishment rate, which can drastically reduce the running cost and maintenance cost of the device. Invented the system, Korea Patent Registration No. 10-474084 has been registered.

FIG. 2 is a block diagram showing the overall configuration of the improved rendering system, a boiler 10 for forming hot steam, a steam chamber 20 to which hot steam generated in the boiler is supplied, and a treatment. It is the same as the conventional rendering system in which the slaughter waste as an object is introduced and heated by the heat of the steam inside the steam chamber, but the steam chamber so that the condensate under the steam chamber can be collected by gravity A lower water supply tank 40 disposed at a lower level to supply replenishment water from the outside, a water supply pump 50 for supplying water from the closed water supply tank to the boiler, a condensate collection pipe 41 connecting the steam chamber and the closed water supply tank, and The upper part of the sealed water tank and the upper part of the steam chamber are interconnected so that the steam pressure in the upper part of the sealed water tank and the steam pressure in the upper part of the steam chamber are kept the same. Has the vent pipe 42 is provided.

According to the rendering system as described above, the steam supplied to the steam chamber is condensed as the temperature decreases as the heat is supplied to the heat treatment chamber 30, so that the condensed water is produced in a density difference with the steam. It is collected in the lower part of the steam chamber, and in the normal operation state, since the level of condensate collected in the hermetic water supply tank is lower than that of the condensate water level in the steam chamber, the water is discharged through the condensate collection pipe 41 and the hermetic water supply tank 40. Are collected).

According to the rendering system of FIG. 2 as described above, condensed water in the steam chamber is collected into a sealed water supply tank by gravity difference and supplied to the boiler, and thus it is possible to prevent heat energy loss due to evaporation of condensate into the atmosphere, thereby greatly increasing fuel costs. It can be saved, and it is not necessary to install steam traps, which can reduce the cost and manpower associated with maintenance and replacement of steam traps.

By the way, as a result of various studies on the method of installing and operating the rendering system at various sites and increasing the energy efficiency, the rendering system was able to prevent the thermal energy loss due to the evaporation of condensate, but the sealed water supply Saturated water, ie, condensed water in the saturated steam and the saturated water in the tank 40 is returned to the boiler, and is supplied to the heat treatment chamber by receiving latent heat from the boiler, so that the saturated steam in the sealed water supply tank 40 The latent heat was not effectively utilized.

The present invention is to solve all the problems of the conventional rendering system as described above, by rendering the heat energy of the steam and condensate circulating the system can be more efficiently utilized rendering that can significantly reduce the maintenance cost of the device The purpose is to provide a system.

Rendering system according to the present invention for achieving the above object, a boiler for forming a high temperature steam, and a steam chamber to which the high temperature steam generated by the boiler is supplied. Heated treatment chamber into which the object to be treated is heated by the heat of the steam inside the steam chamber, and a sealed water supply tank disposed below the steam chamber so that the condensed water at the lower portion of the steam chamber can be collected by gravity, and supplementary water is supplied from the outside. And a water supply pump for supplying water from the closed water supply tank to the boiler, wherein an ejector is installed in the water vapor supply pipe for supplying the high temperature steam generated by the boiler to the steam chamber, wherein the water vapor supply pipe The boiler side supply pipe is connected to the high pressure side inlet of the ejector, and the steam chamber side supply pipe of the steam supply pipe is respectively connected to the discharge port of the ejector, and a re-evaporation pipe for discharging steam is installed at an upper portion of the sealed water supply tank. The re-evaporation pipe line is coupled to the low pressure side inlet of the ejector. Bar, characterized in that,

According to the rendering system according to the present invention, since the condensed water in the steam chamber is collected into a closed water supply tank due to the gravity difference and supplied to the boiler, it is possible not only to prevent thermal energy loss due to evaporation of condensed water into the atmosphere, but also simply condensed water. Unlike the rendering system of FIG. 2, which returns the gas to the boiler, the latent heat of evaporation of saturated steam collected on the top of the sealed water supply tank can be effectively utilized for heating the steam chamber, thereby significantly improving the overall thermal efficiency of the rendering system. Could confirm.

Hereinafter, a preferred embodiment of a rendering system according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram showing an example of a rendering system according to an embodiment of the present invention, Figure 4 is a view illustrating the principle of the ejector, the rendering system according to the present invention, the boiler 10 for forming a high temperature water vapor ), The steam chamber 20 to which the high temperature steam generated by the boiler is supplied, the slaughtered waste to be treated, and the heating chamber 30 heated by the heat of the steam inside the steam chamber, and the condensed water below the steam chamber. It is composed of a closed water supply tank 40 which is disposed below the steam chamber so as to be collected by gravity and water supplement water is supplied from the outside, and a water supply pump 50 for supplying water from the closed water supply tank to the boiler. Similar to the rendering system, but in more detail as follows.

The heat treatment chambers 30 and 30 'form a double vessel inside the steam chambers 20 and 20' such that the inlets 30a and 30a 'and the outlets 30b and 30b' protrude out of the steam chambers 20 and 20 '. It is formed so as to be heated uniformly as a whole by the heat of the steam supplied from the steam chamber, a plurality of can be installed for one boiler in accordance with the capacity of the boiler, in this embodiment two heating An example is a system with a processing room.

The upper portions of the steam chambers 20 and 20 'are provided with headers 10a, 20a and 20a' so that the steam generated by the boiler 10 can be effectively distributed. 30, 30 ') is condensed as the temperature decreases as heat is supplied to the wet saturated vapor, and the condensed water is collected in the lower part of the steam chamber by the density difference with the steam. It is discharged to the sealed water supply tank 40 through the lower condensate discharge pipe (31, 31 ').

As described above, the sealed water supply tank 40 is disposed below the steam chambers 20 and 20 'so that the condensed water in the lower portion of the steam chamber may be collected by gravity, and thus the condensed water discharge pipes 31 of each steam chamber may be disposed. 31 ') may be individually connected to the sealed water supply tank, but as in the present embodiment, it is preferable to connect the condensate collection pipe 41 installed to be inclined about 5 degrees to 15 degrees toward the sealed water supply tank.

Here, the meaning that the sealed water supply tank 40 is disposed below the steam chambers 30 and 30 'does not mean that the upper end of the sealed water supply tank itself is necessarily lower than the lower end of the steam chamber, and in a normal operation state, Compared to the condensate level inside the steam room, the level of condensate collected in the hermetic water supply tank is low, which means that the condensate in the steam room can be collected into a closed water supply tank.

The replenishment water replenished in the sealed water supply tank 40 may be supplied by installing an automatic adjustment on / off valve in the direct water line, but the replenishment water tank 60 and the replenishment water supply pump 60a may be separately supplied and supplied. desirable.

In the rendering system configured as described above, the characteristic configuration of the present invention is as follows.

That is, the ejector is installed in the steam supply line 71 for supplying the high temperature steam generated by the boiler 10 to the steam chamber 20, and the boiler side supply line 71a of the steam supply line is the ejector 80. Coupled to the high-pressure side inlet (A), the steam chamber side supply line (71b) of the steam supply line is coupled to the discharge port (C) of the ejector 80, respectively, unlike the rendering system of Figure 2 sealed water supply tank 40 In the upper portion of the steam is discharged re-evaporation pipe 43 is installed, the re-evaporation pipe 43 is coupled to the low pressure side inlet (B) of the ejector.

Ejector 80 is a mechanical element that sucks low pressure fluid by using the pressure of the high pressure fluid, and then mixes and supplies the low pressure fluid to another, as shown in the schematic principle diagram of FIG. When the high pressure fluid is supplied, the pressure energy of the fluid is injected into the velocity energy while being injected through the nozzle A ', and thus a vacuum is formed in the suction chamber, whereby a vacuum is formed, thereby allowing the suction of the low pressure fluid. The high pressure fluid injected through the nozzle A 'and the low pressure fluid sucked are mixed and supplied to the required place through the discharge port C. FIG.

According to the present invention, the high temperature and high pressure steam discharged from the boiler flows into the high pressure side inlet A of the ejector, and thus, is connected to the low pressure side inlet B of the ejector through the re-evaporation pipe 43. The steam collected in the upper part of the sealed water supply tank 40 is introduced through the low pressure side inlet B and mixed with the high temperature and high pressure steam supplied from the boiler and then supplied to the steam chamber 20, whereby the closed type It is possible to effectively utilize the latent heat of steam above the water supply tank 40 in the heating operation of the steam chamber.

Reference numeral 72 denotes an opening / closing valve installed between the boiler side supply line and the steam chamber side supply line, whereby it is possible to selectively open and close the flow of steam between the ejection port C of the ejector and the steam chamber 20. When the t is selectively opened according to the operating conditions such as the initial operation, only the steam supplied from the boiler is supplied to the steam chamber 20, and there is no pressure difference between the high pressure side inlet port A and the discharge port B of the ejector. Since there is no suction action by the vacuum, the steam of the sealed water supply tank 40 is not supplied to the steam chamber 20.

According to the rendering system according to the present invention as described above, since the condensed water in the steam chamber is collected into the sealed water supply tank by the gravity difference and supplied to the boiler, it is possible to prevent the loss of thermal energy due to the evaporation of condensate into the atmosphere. In addition, since the latent heat of evaporation of saturated steam collected on the top of the sealed water supply tank can be effectively used for heating the steam chamber, it is possible to dramatically improve the overall thermal efficiency of the rendering system.

Claims (2)

A boiler for forming high temperature steam, and a steam chamber supplied with high temperature steam generated by the boiler. Heated treatment chamber into which the object to be treated is heated by the heat of the steam inside the steam chamber, and a sealed water supply tank disposed below the steam chamber so that the condensed water at the lower portion of the steam chamber can be collected by gravity, and supplementary water is supplied from the outside. And a water supply pump for supplying water from the hermetic water supply tank to the boiler. Ejector is installed in the steam supply line for supplying the high temperature steam generated by the boiler to the steam chamber, the boiler side supply line of the steam supply line to the high-pressure side inlet of the ejector, the steam chamber supply line of the steam supply line Are respectively coupled to the ejection openings of the ejector, A re-evaporation conduit through which steam is discharged is installed at an upper portion of the sealed water supply tank, and the re-evaporation conduit is coupled to the low pressure side inlet of the ejector. The rendering system according to claim 1, wherein an opening / closing valve for opening and closing a flow of steam between the ejection port of the ejector and the steam chamber is provided between the boiler side supply pipe line and the steam chamber side supply pipe line.

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