JP3662503B2 - Waste steam heat recovery device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust steam heat recovery apparatus that recovers and uses the heat of steam generated in a wort boiling kettle arranged in a beer production line.
[0002]
[Prior art]
FIG. 3 is a diagram showing a standard production process of beer. In the preparation process, the malt and the raw material hot water are mixed, boiled with the auxiliary raw materials, filtered in the next wort filtration process, and made into a transparent hot water-like wort. This wort is fed into the wort boiling process through the wort preheating process. In this wort boiling process, hop is added to the wort in the wort boiling pot and boiled, and about 10% of the whole is discharged as steam and concentrated. Therefore, in this wort boiling process, a large amount of heat is discharged with the discharge of steam. The boiled and concentrated wort is allowed to stand in a whirlpool (not shown), and the hot coagulum is removed while still hot. This hot wort sent out from the whirlpool is cooled by a heat exchanger in a wort cooling step, and further fed into a fermentation tank for fermentation. Thereafter, the alcohol is stored in a storage tank, filtered in a filtration process, sterilized, and then packed into a container to obtain a product.
[0003]
In the beer production process described above, since a large amount of heat is discharged in the wort boiling process, the heat is recovered and the heat is used for wort preheating and sterilization. FIG. 4 is a schematic configuration diagram of a heat recovery apparatus that performs heat recovery of steam discharged from the wort boiling pot. Referring to FIG. 4, the exhaust steam from boiling kettle 103 is agglomerated by heat exchange with about 80 ° C. hot water fed from the tank in heat exchanger HE, and the part not agglomerated is discharged as steam. The pressure in the wort boiling pot 103 is preferably low for quality and other reasons. For this reason, the wort boiling pot 103 is provided with a pressure transmitter PE that detects and transmits pressure. When the signal from the pressure transmitter PE is smaller than the set pressure value of the pressure indicating controller PIC, the hot water flow rate control valve CV is closed to reduce the heat recovery of the secondary side heat medium, and when the pressure exceeds the set pressure. The hot water flow rate control valve CV is opened to increase the heat recovery amount of the secondary side heat medium. For this reason, the aggregate amount of the exhaust steam in the heat exchanger HE increases, and as a result, the steam pressure in the boiling kettle can be reduced. In the present invention, the high-temperature heat medium side of the heat exchanger is the primary side, and the low-temperature heat medium side is the secondary side.
[0004]
The hot water of about 80 ° C. sent to the heat exchanger HE is heated to about 97 ° C. by this heat exchange and sent back to the hot water storage tank 108. Hot water in the hot water storage tank 108 is used for heat exchange in the heat exchanger 104 for preheating wort and the heat exchanger 105 for producing sterilized hot water. In the wort preheating heat exchanger 104, about 80 ° C. wort is heated to about 95 ° C., and in the heat exchanger 105 for producing sterilized hot water, room temperature water is heated to about 95 ° C. hot water. This sterilized water is stored in the sterilized water tank 106 and used for sterilizing hot water.
[0005]
When the calorific value of the waste steam generated from the wort boiling pot is 150, 150 is recovered in the heat exchanger HE, 100 of which is used for the production of bactericidal hot water, and 50 is used for the preheating of the wort. it can.
[0006]
[Problems to be solved by the invention]
In the above heat recovery apparatus, since the system is configured mainly using wort preheating as the main purpose of waste heat utilization, the temperature of water for heat recovery has been raised from about 80 ° C. to about 97 ° C. In order to reduce the pressure in the boiling kettle, means such as increasing the cross-sectional area of the exhaust steam passage, or increasing the capacity of the heat exchanger and increasing the condensation rate of the exhaust steam when the cross-section of the exhaust steam passage is the same. Can be considered. However, when the temperature rise is about 17 ° C., in order to agglomerate the exhaust steam from the wort boiling pot at a high speed, it is necessary to send a large amount of hot water of about 80 ° C. as a heat recovery medium to the heat exchanger. is there. For this reason, the capacity of the pump P0 must be very large. As shown in FIG. 4, in addition to the pump P0, it is necessary to arrange pumps P1, P2, P3, etc. in the primary and secondary circulation paths of the heat exchangers described above.
[0007]
An object of the present invention is to provide an exhaust steam heat recovery apparatus that can reduce the pressure in a wort boiling pot and can be operated with a small pump capacity.
[0008]
[Means for Solving the Problems]
The exhaust steam heat recovery apparatus of the present invention is an apparatus that recovers and uses the heat of steam generated from a wort boiling pot disposed in a beer production line. In this exhaust steam heat recovery device, the first heat exchanger and the second heat exchange are made so that steam is fed from the wort boiling pot to each of the first heat exchanger and the second heat exchanger. Are disposed in parallel with the wort boiling kettle, and are provided with a first discharge path and a second discharge path for discharging steam generated from the wort boiling kettle in parallel with the wort boiling pot. The first heat exchanger (HE - 1) is provided in the first exhaust passage, and the second heat exchanger (HE - 2) is provided in the second exhaust passage . Then, after the first heat exchanger (HE - 1), a closing means (MD - 1) capable of closing the first discharge path is provided (Claim 1).
[0009]
With this configuration, the exhaust steam heat recovery is performed by two heat exchangers arranged in parallel to each other, so that the length of the exhaust steam heat recovery portion is not increased, but the cross-sectional area is increased. For this reason, while maintaining the pressure in the wort boiling pot low, the heat of the exhaust steam can be recovered with a margin. In addition, for example, if the temperature increase on the secondary side of one heat exchanger is increased, the amount of circulating (warm) water does not have to be increased so much. As a result, the number of heat exchangers is reduced to two. Although the number of pumps increases as much as possible, the capacity of each pump can be reduced, so that the installation cost of the pump and the power cost can be reduced. In addition, the overall configuration of the apparatus can be simplified, and operation and maintenance inspection can be easily performed.
[0010]
In addition, each of the first heat exchanger and the second heat exchanger has a capacity to aggregate the steam by heat exchange with respect to the maximum amount of steam discharged from the wort boiling pot. Is desirable. With this configuration, steam can be condensed according to the pressure in the wort boiling pot, and the pressure in the wort boiling pot can be kept at a low value with a margin. Moreover, the heat recovery of the exhaust steam can be performed more completely, and the thermal economy can be improved. Furthermore, the aggregated water can be easily drained with, for example, drain without releasing the heat vapor to the outside. “The heat exchanger is arranged in parallel to the wort boiling pot” means that the heat exchanger is arranged in parallel in the path of the steam discharged from the wort boiling pot as seen from the wort boiling pot. It means being. That is, the arrangement of any heat exchanger and the arrangement of the steam discharge passages associated with the arrangement of the heat exchanger are included as long as they are parallel in terms of the path.
[0011]
With this configuration, exhaust steam heat recovery is performed by heat exchangers respectively disposed in two discharge paths that are disposed in parallel with each other. The cross-sectional area of the exhaust steam heat recovery portion increases to the sum of the cross-sectional areas of the two exhaust passages. For this reason, while maintaining the pressure in the wort boiling pot low, the heat of the exhaust steam can be recovered with a margin. Further, the first heat exchanger and the second heat exchanger may have a capacity for aggregating the steam by heat exchange with respect to the maximum amount of steam discharged through the respective discharge paths. desirable. With this configuration, steam can be condensed according to the pressure in the wort boiling pot, and the pressure in the wort boiling pot can be kept at a low value with a margin. Moreover, the aggregated water can be easily drained with, for example, drain without releasing the heat vapor to the outside. The first and second discharge paths may be two discharge paths branched from a common discharge path from the wort boiling pot, or two provided separately from the wort boiling pot. It may be a discharge path.
[0012]
By closing the first discharge path by the closing means, the first heat exchanger can recover only the heat quantity of the exhaust steam that enters the first discharge path and condenses. For this reason, only the fixed part of exhaust steam heat recovery can be shared by the first heat exchanger, and the variable part of exhaust steam heat recovery can be shared by the second heat exchanger. For this reason, the fluctuation control of the heat recovery can be concentrated on the second heat exchanger, and the control device cost can be reduced. In addition, a valve etc. are mention | raise | lifted as said closing means.
[0017]
In the exhaust steam heat recovery apparatus of the present invention, for example, when the pressure in the wort boiling pot becomes equal to or higher than a set pressure, the closing means is closed and the flow rate of the fluid circulating in the second circulation path is controlled. Is desirable (Claim 2 ).
[0018]
According to this configuration, the pressure of the wort boiling pot can be set to a desired value by opening and closing the closing means and increasing or decreasing the flow rate of the secondary heat medium of the second heat exchanger according to the operation status of the wort boiling pot. Can be easily maintained with high accuracy at a low value.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an exhaust steam heat recovery apparatus according to an embodiment of the present invention. The greatest feature of the present invention is that heat is recovered from the exhaust steam discharged from the wort boiling pot 3 by two heat exchangers HE-1 and HE-2 arranged in parallel. The heat recovered in the heat exchanger HE-1 is stored in the tank 7 as hot water, and the wort before entering the wort boiling pot in the wort preheating heat exchanger 4 is preheated from about 80 ° C. to about 97 ° C. Used to do. Further, the sterilized hot water recovered from the exhaust steam and heated from normal temperature to 95 ° C. in the heat exchanger HE-2 is stored in the tank 6 and used as sterilized hot water as necessary.
[0020]
In the said structure, the pumps P1 and P3 which respectively send the hot water heat-exchanged with the waste steam discharged | emitted from the wort boiling pot to the two hot water tanks 6 and 7 are required. However, the capacity of these pumps, even if all are added, is a capacity that can be smaller than that of the conventional large-capacity pump P0.
[0021]
By adopting such a configuration, the heat recovery capacity can be increased and the cross-sectional area of the exhaust steam path can be increased. For this reason, after sufficient heat recovery, the pressure in the wort boiling pot can be reduced and maintained at a constant pressure. Furthermore, as can be seen from the conventional example shown in FIG. 4, the number of heat exchangers, hot water storage tanks, and pumps increases, but the pump P0 having a large capacity can be dispensed with. In addition, unlike the conventional apparatus, heat exchange for wort preheating and sterilizing water production is not performed using a single hot water storage tank, so that an exhaust steam heat recovery apparatus with a simple configuration can be obtained. For this reason, operation and maintenance inspection are facilitated.
[0022]
In FIG. 1, the valve MD-2 after the heat exchanger HE-2 is open, but the valve MD-1 after the heat exchanger HE-1 is closed. A predetermined amount of steam from the wort boiling pot is led to the heat exchanger HE-1 and aggregated, and exhaust steam corresponding to the aggregated amount is sent to HE-1. Therefore, the heat exchanger HE-1 shares a certain fixed part of the exhaust steam heat recovery. The heat exchanger HE-2 performs variable exhaust steam heat recovery by the following mechanism. The pressure indicating controller PIC that has received the pressure signal from the pressure transmitter PE that also serves as a pressure detector for detecting the steam pressure of the wort boiling pot starts its operation when the pressure signal exceeds a preset pressure. The pressure indicating controller PIC adjusts the opening of the flow control valve CV according to the magnitude of the difference between the set pressure and the actual pressure. For example, when the pressure in the wort boiling pot is very high, the difference from the set pressure becomes very large, and the flow control valve CV is fully opened. For this reason, the amount of heat recovered in the heat exchanger HE-2 increases, and therefore the amount of aggregation increases, and the pressure in the wort boiling pot 3 leading to the heat exchanger HE-2 can be reduced.
[0023]
FIG. 2 is a time chart showing the operation status of each device of one batch of beer production. When boiling is started in the wort boiling pot, the pressure in the wort boiling pot is low. In this starting state, the valve MD-1 of the heat exchanger HE-1 is opened, only the pump P1 in the first circuit is operated, the valve MD-2 of the heat exchanger HE-2 is closed, and the pump P2 Has stopped. Therefore, heat exchange is performed only in the heat exchanger HE-1. When the boiling is started and 30 minutes have passed, the pressure in the wort boiling pot rises when only the valve MD-1 is opened. When it is detected that the PE-PIC has become equal to or higher than the set pressure, the valve MD-2 is opened and the pump P2 is operated so that the heat exchanger HE-2 starts heat exchange. At this time, by closing the valve MD-1 of the heat exchanger HE-1, the heat exchanger HE-1 performs only a fixed amount of heat recovery. The PE-PIC detects the difference between the set pressure and the actual pressure, and proportionally adjusts the degree of opening of the flow control valve CV according to the magnitude of the difference. As a result, according to the pressure in the wort boiling kettle, the speed of the aggregate amount of the exhaust steam in the heat exchanger HE-2 can be adjusted, and the pressure fluctuation in the wort boiling kettle can be suppressed.
[0024]
Assuming that the calorific value of the exhaust steam generated in the wort boiling pot is 150, the heat exchanger HE-1 collects 50 of them, and the heat exchanger HE-2 collects the remaining 100. In the heat exchanger HE-2 having a large heat recovery capacity, by sharing the fluctuation amount of the heat recovery, the pressure fluctuation in the wort boiling pot can be suppressed with high responsiveness, and a desired low pressure can be maintained.
[0025]
Although the embodiments of the present invention have been described above, the embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is limited to these embodiments. There is no. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.
[0026]
【The invention's effect】
According to the present invention, exhaust steam heat discharged from a wort boiling pot disposed in a beer production line can be recovered in a state where the wort boiling pot pressure is kept in a low range. Moreover, compared with the conventional apparatus, a pump with a large capacity is not required, and the structure of the apparatus can be simplified.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an exhaust steam heat recovery apparatus according to an embodiment of the present invention.
2 is a time chart of each partial device in the exhaust steam heat recovery device of FIG. 1. FIG.
FIG. 3 is a diagram showing a general beer manufacturing process.
FIG. 4 is a configuration diagram of a conventional exhaust steam heat recovery device.
[Explanation of symbols]
3 Wort boiling kettle, 4 wort preheating heat exchanger, 6 bactericidal hot water tank, 7 wort preheating hot water tank, HE-1 heat recovery heat exchanger for wort preheating, HE-2 bactericidal hot water Heat exchanger for heat recovery for manufacturing, MD-1 Heat exchanger HE-1 valve (damper), MD-2 Heat exchanger HE-1 valve (damper), PE pressure transmitter, PIC pressure indication adjustment Meter, CV flow control valve, P1, P3, P4 pump.

Claims (2)

An apparatus for recovering heat of steam generated from a wort boiling pot (3) arranged in a beer production line,
The first heat exchanger (HE-1) and the second heat exchanger (HE-2) are each fed so that steam is fed from the wort boiling pot into the first heat exchanger (HE-1) and the second heat exchanger (HE-2). 1) and the second heat exchanger (HE-2) are arranged in parallel to the wort boiling pot ,
A first discharge path for discharging steam generated from the wort boiling pot and a second discharge path are provided in parallel to the wort boiling pot, and the first heat exchange is provided in the first discharge path. A heater (HE - 1) and a second heat exchanger (HE - 2) in the second discharge path ,
An exhaust steam heat recovery apparatus comprising closing means (MD - 1) capable of closing the first exhaust path after the first heat exchanger (HE - 1) . When the pressure in the wort boiling pot (3) becomes equal to or higher than a set pressure, the closing means (MD-1) is closed to control the flow rate of the fluid circulating in the second circulation path. Item 2. An exhaust steam heat recovery apparatus according to Item 1 .

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