JP2002272444A - Exhaust steam-recovery apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust steam-recovery apparatus capable of reducing pressure in a wort boiler and enabling its operation with a small pumping capacity. SOLUTION: An apparatus for recycling the heat of steam generated from a wort boiler 3 placed on a beer manufacturing line. The first heat-exchanger HE-1 and the second heat exchanger HE-2 are placed parallelly to the wort boiler 3 so that the steam from the wort boiler 3 can be charged to each heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust steam heat recovery apparatus for recovering and utilizing the heat of steam generated in a wort boiling kettle arranged in a beer production line.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a standard production process of beer. In the preparation step, the malt and the raw material water are mixed together, boiled together with the auxiliary raw material, and filtered in the next wort filtration step to obtain a transparent candy-like wort. This wort is sent to the wort boiling step after the wort preheating step. In the wort boiling step, hops are added to the wort in a wort boiling kettle and the mixture is 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 coagulated matter is removed. The hot wort sent out from the whirlpool is cooled by a heat exchanger in a wort cooling step, and is further sent to a fermentation tank for fermentation. After that, it is stored in a storage tank,
After being filtered and sterilized in a filtration step, the product is packed in a container and made into a product.

[0003] In the above-described beer production process, a large amount of heat is discharged in the wort boiling process, so that heat is recovered and the heat is used for wort preheating and sterilization. FIG. 4 is a schematic configuration diagram of a heat recovery device that recovers heat of steam discharged from a wort boiling pot. Referring to FIG. 4, steam discharged from boiling pot 103 exchanges heat with hot water at about 80 ° C. sent from a tank in heat exchanger HE to be aggregated, and the non-aggregated portion 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 for detecting and transmitting pressure. If the signal from the pressure transmitter PE is smaller than the set pressure value of the pressure indicating controller PIC, the hot water flow control valve CV is throttled,
The heat recovery of the secondary heat medium is reduced, and when the pressure exceeds the set pressure, the hot water flow control valve CV is opened to increase the heat recovery amount of the secondary heat medium. For this reason, the amount of aggregation of the exhaust steam in the heat exchanger HE increases, and as a result, the steam pressure in the boiling pot can be reduced. In the present invention, the high-temperature heat medium side of the heat exchanger is defined as a primary side, and the low-temperature heat medium side is defined as a secondary side.

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. The hot water in hot water storage tank 108
It is used for heat exchange in the wort preheating heat exchanger 104 and the heat exchanger 105 for producing sterilized hot water. In the wort preheat heat exchanger 104, wort at about 80 ° C. is heated to about 95 ° C., and in the heat exchanger 105 for producing sterilized hot water, normal-temperature water is heated to about 95 ° C. hot water. This sterilizing water is
It is stored in the sterilized hot water tank 106 and used for hot water sterilization.

[0005] The amount of heat of the exhaust steam generated from the wort boiling kettle is 1
When it is set to 50, 15 in the heat exchanger HE.
0 was recovered, and 100 of them were used for the production of sterilized hot water.
0 can be used for wort preheating.

[0006]

In the above-mentioned heat recovery apparatus, since the system is constructed mainly with wort preheating as the main purpose of waste heat utilization, the water for heat recovery is from about 80 ° C to about 97 ° C. Temperature had risen. In order to lower the pressure in the boiling pot, the cross-sectional area of the exhaust steam path must be increased, and if the cross section of the exhaust steam path is the same, the capacity of the heat exchanger is increased to increase the coagulation rate of the exhaust steam. Can be considered. However, at the above temperature rise of about 17 ° C., a large amount of hot water of about 80 ° C., which is a heat recovery medium, needs to be sent to the heat exchanger in order to coagulate the steam discharged from the wort boiling kettle at a high speed. 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, pumps P1 and P
2, P3, etc. need to be arranged.

An object of the present invention is to provide an exhaust steam heat recovery apparatus which can lower the pressure in a wort boiling pot and can be operated with a small pump capacity.

[0008]

The waste steam heat recovery apparatus of the present invention is an apparatus for recovering and utilizing the heat of steam generated from a wort boiling kettle arranged in a beer production line. This exhaust steam heat recovery device is connected to the first heat exchanger and the second heat exchanger such that steam is sent from the wort boiling kettle to each of the first heat exchanger and the second heat exchanger. The container is arranged in parallel with the wort boiling pot (claim 1).

With this configuration, the heat recovery of the exhaust steam is performed by the two heat exchangers arranged in parallel with each other.
The length of the exhaust steam heat recovery portion does not increase, but rather increases the cross-sectional area. Therefore, while keeping the pressure in the wort boiling pot low, the heat of the exhaust steam can be recovered with a margin. Further, for example, if the amount of temperature rise on the secondary side of one heat exchanger is increased, the amount of circulating (warm) water does not need to be so large, and as a result, the number of heat exchangers becomes two. Although the number of pumps increases as much as possible, the capacity of each pump can be small, so that the installation cost of the pump, the power cost, and the like can be reduced. In addition, the configuration of the entire apparatus can be simplified, and operation and maintenance can be easily performed.

Each of the first heat exchanger and the second heat exchanger has a capacity for coagulating the maximum amount of steam discharged from the wort boiler by heat exchange. Is desirable. With this configuration, the steam is coagulated 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. Also,
Exhaust steam heat recovery can be performed more completely, and thermal economy can be improved. Further, the coagulated water can be easily drained, for example, by draining without releasing the heat vapor to the outside. In addition, "arranging a heat exchanger in parallel with the wort boiling kettle" means, in the path of steam discharged from the wort boiling kettle, as viewed from the wort boiling kettle,
Indicates that the heat exchangers are arranged in parallel. That is, the arrangement of any heat exchangers and the arrangement of the steam discharge passage accompanying the arrangement of the heat exchangers are included as long as they are parallel in terms of the path.

In the exhaust steam heat recovery apparatus of the present invention, for example, the first heat exchanger and the second heat exchanger each have a first circulation path through which a fluid that exchanges heat with steam circulates and a second circulation path. And the temperature increase ΔT ₁ of the fluid in the first circulation path due to the heat exchange in the first heat exchanger is equal to the fluid in the second circulation path due to the heat exchange in the second heat exchanger. it can be as smaller than temperature increase amount [Delta] T ₂ (claim 2). In the above configuration, for example, a fluid used for wort preheating using heat recovered from the steam flows through the first circulation path,
The fluid used for heating the sterilized hot water using the heat recovered from the steam can flow through the circulation path (claim 3).

For example, the hot water on the primary side in the preheating of wort only drops from about 97 ° C. to about 80 ° C., and does not require much heat as a whole. Also, the amount of heat used for sterilizing water requires more heat than the amount required for wort preheating,
Since heat is recovered by raising the temperature from room temperature to about 95 ° C., the amount of circulating water does not need to be so large. For this reason, although the number of pumps is increased by two heat exchangers, the capacity of each pump can be small, and the installation cost and operating cost of the pump can be reduced.

[0013] In the exhaust steam heat recovery apparatus of the present invention, the first discharge path for discharging the steam generated from the wort boiling pot and the second discharge path are provided.
And a discharge path for the wort are provided in parallel with the wort boiling kettle.
The first heat exchanger in the discharge path of the second and the second heat exchanger in the second discharge path.
It is desirable to provide a heat exchanger (claim 4).

With this configuration, the heat recovery of the exhaust steam is performed by the heat exchangers respectively disposed in the two discharge passages disposed in parallel with each other. The cross-sectional area of the exhaust steam heat recovery part is
It increases to the sum of the cross-sectional areas of the two discharge channels. For this reason,
While keeping 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 coagulating the steam by heat exchange with respect to a maximum amount of the steam discharged through the respective discharge paths. desirable. With this configuration, the steam is coagulated 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. Further, the coagulated water can be easily drained by, for example, drainage without releasing the heat vapor to the outside. Note that the first and second discharge paths may be two discharge paths in which a common discharge path from the wort boiling kettle branches, or two separate discharge paths provided from the wort boiling pot. It may be a discharge path.

[0015] In the exhaust steam heat recovery apparatus of the present invention, the first
And when the exhaust steam condenses in the second heat exchanger,
It is desirable to provide a closing means capable of closing the first discharge path after the first heat exchanger (claim 5).

By closing the first discharge passage by the closing means, the first heat exchanger can collect only the heat of the exhaust steam that enters the first discharge passage and condenses. For this reason, only the fixed portion of the exhaust steam heat recovery can be shared by the first heat exchanger, and the variable portion of the exhaust steam heat recovery can be shared by the second heat exchanger. Therefore, the fluctuation control of the heat recovery can be performed intensively in the second heat exchanger, and the cost of the control device can be reduced. In addition,
The closing means includes a valve and the like.

[0017] In the exhaust steam heat recovery apparatus of the present invention, for example, when the pressure in the wort boiling tank becomes equal to or higher than the set pressure, the closing means is closed and the flow rate of the fluid circulating through the second circulation path is reduced. It is desirable to control (claim 6).

According to this configuration, the closing means is opened and closed in accordance with the operation state of the wort boiling kettle, and the flow rate of the secondary heat medium of the second heat exchanger is increased / decreased. Can easily be maintained at a desired low value with high accuracy.

[0019]

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 device according to an embodiment of the present invention. The most significant feature of the present invention is that two heat exchangers HE-1 and HE-2 arranged in parallel from the exhaust steam discharged from the wort boiling kettle 3.
The point is to recover heat. The heat recovered by the heat exchanger HE-1 is stored as hot water in the tank 7, and the wort before entering the wort boiling tank is preheated from about 80 ° C to about 97 ° C in the wort preheat heat exchanger 4. Used to do. Also,
The sterilized hot water that has recovered heat from the exhaust steam in the heat exchanger HE-2 and raised the temperature from room temperature to 95 ° C. is stored in the tank 6,
It is used as sterilizing water as needed.

In the above configuration, the hot water which has exchanged heat with the steam discharged from the wort boiling kettle is supplied to two hot water tanks 6,
7 require pumps P1 and P3, respectively.
However, the capacities of these pumps are smaller than the conventional large-capacity pump P0 even when all of them are added.

By employing such a configuration, the capacity of heat recovery 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 kettle can be reduced and maintained at a constant pressure.
Furthermore, as can be seen from the comparison with 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 omitted. Further, unlike the conventional apparatus, the heat exchange for wort preheating and sterilizing hot water production is not performed using one hot water storage tank, so that an exhaust steam heat recovery apparatus having a simple configuration can be provided. Therefore, operation and maintenance and inspection are facilitated.

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 kettle is guided to the heat exchanger HE-1 to be coagulated, and the discharged steam corresponding to the coagulated amount is sent to HE-1. Therefore, a fixed portion of a fixed amount of exhaust steam heat recovery is
E-1 shares. In the heat exchanger HE-2, variable exhaust steam heat recovery is performed by the following mechanism. The pressure indicating controller PIC receiving the pressure signal from the pressure transmitter PE also serving as a pressure detector for detecting the steam pressure of the wort boiling pot starts its operation when the pressure signal becomes equal to or higher than a preset pressure. The pressure indicating controller PIC adjusts the opening of the flow control valve CV according to the difference between the set pressure and the actual pressure. For example, when the pressure in the wort boiling kettle becomes 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 recovery in the heat exchanger HE-2 increases, and thus the amount of aggregation increases, and the pressure in the wort boiling pot 3 communicating with the heat exchanger HE-2 can be reduced.

FIG. 2 is a time chart showing the operation status of each apparatus 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 start state, the valve M of the heat exchanger HE-1
D-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,
Pump P2 has stopped. Therefore, the heat exchanger HE
Heat exchange is performed only at -1. Boiling starts, 3
When 0 minute has elapsed, the pressure in the wort boiling kettle increases when only the valve MD-1 is opened. When the PE-PIC detects that the pressure is 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, the valve MD-1 of the heat exchanger HE-1 is closed so that the heat exchanger HE-1 performs only a fixed amount of heat recovery. 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, the speed of the coagulation amount of the exhaust steam in the heat exchanger HE-2 can be adjusted according to the pressure in the wort boiling pot, and the pressure fluctuation in the wort boiling pot can be suppressed.

The calorific value of the steam discharged from the wort boiling kettle is reduced to 15
Assuming that it is 0, the heat exchanger HE-1 recovers 50 of them, and the heat exchanger HE-2 recovers the remaining 100.
In the heat exchanger HE-2 having a large heat recovery capacity, the fluctuation in the heat recovery is shared, so that the pressure fluctuation in the wort boiling pot can be suppressed with good responsiveness, and a desired low pressure can be maintained.

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. It will not be done. The scope of the present invention is shown by the description of the claims, and further includes all modifications within the meaning and scope equivalent to the description of the claims.

[0026]

According to the present invention, the heat of the exhaust steam discharged from the wort boiling kettle disposed in the beer production line can be recovered while keeping the wort boiling pan pressure in a low range. Further, compared with the conventional apparatus, a pump having a large capacity is not required, and the configuration of the apparatus can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an exhaust steam heat recovery device according to an embodiment of the present invention.

FIG. 2 is a time chart of each partial device in the exhaust steam heat recovery device of FIG.

FIG. 3 is a diagram showing a general beer production process.

FIG. 4 is a configuration diagram of a conventional exhaust steam heat recovery device.

[Explanation of symbols]

3 wort boiling pot, 4 wort preheating heat exchanger, 6 sterilizing hot water tank, 7 wort preheating hot water tank, HE-1 heat recovery heat exchanger for wort preheating, HE-2 sterilizing hot water Heat exchanger for heat recovery for production, MD-1 heat exchanger HE-1
Valve (damper), MD-2 heat exchanger HE-1 valve (damper), PE pressure transmitter, PIC pressure indicating controller, C
V Flow control valve, P1, P3, P4 pump.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobumichi Imaizumi, 2-6 Hiuchi, Saijo-shi, Ehime Prefecture Asahi Vehicle Co., Ltd. (72) Inventor Tetsuya Tomioka 2-6, Hiuchi, Saijo-shi, Ehime Prefecture Asahi Vehicle Co., Ltd. Shikoku Inside the factory (72) The inventor Takahiro Kusabe 1-6-28 Nakatsu, Kita-ku, Osaka-shi Inside the Hokoku Building Daikin Plant Co., Ltd.

Claims (6)

[Claims] An apparatus for recovering heat of steam generated from a wort boiling pot (3) arranged in a beer production line, comprising: a first heat exchanger (HE-1); Vessel (HE-
2), the first heat exchanger (HE-1) and the second heat exchanger (HE-2) are connected to the wort boiler so that steam is sent from the wort boiler to each of the wort boilers. Exhaust steam heat recovery device arranged in parallel to 2. The first heat exchanger (HE-1) and a second heat exchanger (HE-1).
The first heat exchanger (HE-1) passes through a first circulation path and a second circulation path through which the fluid that exchanges heat with the steam passes through the first heat exchanger (HE-1). The temperature rise ΔT ₁ of the fluid in the first circulation path due to the heat exchange of the first heat exchanger is greater than the temperature rise ΔT ₂ of the fluid in the second circulation path due to the heat exchange in the second heat exchanger (HE-2). The exhaust steam heat recovery device according to claim 1, wherein the heat recovery device is also small. 3. A fluid used for wort preheating using heat recovered from the steam in the first circulation path, and sterilized hot water in the second circulation path using heat recovered from the steam. The exhaust steam heat recovery device according to claim 2, wherein a fluid used for heating flows. 4. A wort-boiling kettle is provided with a first discharge path and a second discharge path for discharging steam generated from the wort boiling pot in parallel with the wort boiling pot, and the first discharge path is provided in the first discharge path. The exhaust steam heat recovery according to any one of claims 1 to 3, further comprising a first heat exchanger (HE-1) and a second heat exchanger (HE-2) in the second discharge path. apparatus. 5. The exhaust system according to claim 4, further comprising a closing means (MD-1) capable of closing the first exhaust path after the first heat exchanger (HE-1). Steam heat recovery device. 6. 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, and the flow rate of the fluid circulating in the second circulation path. The exhaust steam heat recovery device according to claim 5, wherein