JPH0787770B2 - Exhaust heat recovery system heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention is necessary for continuous cooling by recovering steam at atmospheric pressure of 100 ° C. generated during a boiling process in which boiling and cooling are alternately repeated. The present invention relates to an exhaust heat recovery type heat treatment apparatus which is suitable for use in a beer charging process or the like in which a different cold heat source can be obtained, and in particular, boiling and cooling are required to be alternately and frequently performed.

(Prior art) In a manufacturing process in which boiling and cooling are alternately repeated, for example, in a beer charging process, an operation of causing offensive odor components contained in the raw material heated to 100 ° C by adding hops to wort to be emitted together with steam for 90 minutes Go for about 1 hour and let it cool naturally, then 100
It takes about 5 minutes to cool to about 5 ° C.

In the past, heating and cooling were often processed by independent heating devices and cooling devices, but using two types of devices is disadvantageous in terms of cost in terms of equipment and operation. Therefore, recently, a method for recovering waste heat particularly during boiling has been proposed and partially put into practical use.

This heat recovery is performed as described below. In each wort boiling pot, each batch is first boiled with steam supplied from the boiler and then discharged from the top of the pot.
By sucking and compressing steam at 100 ° C and atmospheric pressure with a vapor compressor such as a screw type, the temperature is raised to a temperature level (130 to 140 ° C) where it can be reheated and reused, and the discharged steam is provided separately. The wort is heated via a heat exchanger.

Therefore, energy is supplied from the boiler until the start of boiling, but after the temperature rises to a certain temperature, sufficient energy is supplied from the compressor even if steam is stopped, and boiling can be continued.

(Problems to be Solved by the Invention) The heat recovery described above is also described in "Frozen Volume 60 No. 697, November 1985, page 1134", but this is heat recovery for steam. It does not contribute to the improvement of the thermal efficiency during the cooling operation, and although it has a running reduction effect, it is not so large in terms of the overall thermal efficiency. It is difficult to mention the fact that, even if the heat of the condensation heat generated during the cooling operation is not recovered at the same time, a comprehensive improvement in the total heat efficiency cannot be obtained. The resolution has not been made as before.

In view of such an actual situation, the present invention has been made, and particularly as a heat source for recovering cooling heat as well as reusing this heat by recovering heat of steam generated during boiling, By using the cool storage heat method that can be effectively used together, the running cost is reduced by securing the necessary heat source for heating and cooling that are alternately performed with a time lag and improving the thermal efficiency. The purpose is to establish a method and means for performing various operational controls, and promote the popularization for general use.

(Means for Solving the Problems) As will be apparent from the accompanying drawings showing examples of the present invention, however, the liquid to be heat treated is heated to 100 ° C. under atmospheric pressure for a certain period of time and a certain number of cycles. A boiling device (1) having a plurality of heating containers (3) such as a boiling pot and performing a heating operation alternately and continuously as a whole, and a liquid to be heat treated by the boiling device (1). In a heat treatment device comprising a cooling device (2) for alternately guiding heat to cooling heat exchangers (11), (11) and cooling by heat exchange with low-temperature cold water, dampers (19) are respectively provided. The heat recovery ducts (18), (18) and the primary passages (21) connected to the gas phase portions of the heating containers (3), (3) respectively are bundled in the heat recovery ducts (18), (18). Connected heat recovery heat exchanger (2
0), extraction fan (26) connected to the primary passage (21)
And the atmospheric pressure generated in each heating vessel (3), (3)
A heat recovery line (4) for exchanging heat between 100 ° C. steam and water flowing through the secondary coil (22) of the heat recovery heat exchanger (20), and the heat recovery heat exchanger ( The hot water inlet and the hot water return port of the secondary coil (22) of 20) are provided at the upper part of a vertically long structure hot water tank (29) capable of forming and storing a temperature boundary film due to the difference in specific gravity due to temperature. And a hot water circulation line (5), which is connected to the hot water outlets provided at the bottom and the bottom, respectively, and is capable of storing a predetermined amount of hot water that does not reach boiling in the hot water tank (29), and a generator. (32), condenser (33), evaporator (34) and absorber (35), and the heating coil (36) of the generator (32) is provided at the upper part of the hot water tank (29). And absorption-type refrigerators (6) that are cyclically connected to the hot water return ports provided in the lower part
And a cold water tank (43) having a vertically long structure formed in the same manner as the hot water tank (29), with a cold water inlet provided at a lower portion and a cold water outlet provided at an upper portion as a cold water coil (42) for the evaporation (34). And a cold water circulation line (7) capable of storing low-temperature cold water in the cold water tank (43), and a cold water outlet and an upper part provided in the lower part of the cold water tank (43). The cold water return port provided is cyclically connected to the cooling heat exchangers (11) and the tertiary coil (14) of the cooling heat exchanger (11), and the cooling heat exchangers (11) and (11) are primary. Coil (1
2) The cooling circulation line (8) for cooling the liquid to be heat-treated, the dampers (19) of the heat recovery ducts (18) and (18) are opened, the extraction fan (26) is operated, and The operation of the cooling device (2), the hot water circulation of the hot water circulation line (5), the freezing operation of the absorption refrigeration system (6), the cold water circulation of the cold water circulation line (7) and the cooling operation of the cooling circulation line (8). And a control device for performing the
Corresponding dampers (19), according to the preparation start signal and preparation frequency signal transmitted when operating the heating containers (3), (3)
Damper control means for opening (19), and damper (19),
Either one of (19) is opened, and the extraction fan (26) is operated when the abnormal differential pressure signal is not transmitted, and the extraction fan (26) is stopped by transmitting the abnormal differential pressure signal. Extraction fan control means and heat recovery duct (1
When the water vapor temperature after passing through the dampers (19) of (8) and (18) is equal to or higher than the set value and the hot water of the set temperature is stored in the hot water tank (29), the absorption refrigerator (6 ) Is operated, and the refrigerator control means for increasing or decreasing the circulating amount of hot water between the hot water tank (29) and the heating coil (36) of the generator (32) according to the refrigeration load, and the inside of the hot water tank (29). Hot water circulation control means for adjusting the circulating hot water amount in the warm water circulating line (5) so that a predetermined temperature and a predetermined amount of warm water are stored in
As cold water of a predetermined temperature is stored in the cold water tank (43),
Cold water circulation control means for adjusting the amount of circulating cold water in the cold water circulation line (7), and a cooling start signal is transmitted to require cooling after the heat treatment, and the cold water tank (4
It is characterized by comprising a cooling control means for causing cold water circulation of the cooling circulation line (8) by storing cold water of a predetermined temperature in 3).

Further, the invention of claim 2 is, in addition to the invention of claim 1, heat exchange for cooling low temperature cold water such as brine when the cooling temperature of the absorption refrigerator (6) is higher than a predetermined temperature. The control device is characterized in that additional cooling control means for circulating the secondary coil (13) of the containers (11) and (11) is provided.

Further, in the invention of claim 3, the heating device (47) is provided in the pipe line connecting the heating coil (36) of the generator (32) and the hot water outlet of the hot water tank (29), and the evaporator ( A structure in which a cooling device (49) is provided in a pipe line connecting the cold water coil (42) of 34) and the cold water inlet of the cold water tank (43) is added to the invention of claim 1 or 2. To do.

(Operation) The heat treatment device is 100 ° C. in the heat recovery line (4).
It is possible to efficiently obtain hot water of about 90 ° C. from the steam, and the heat recovery efficiency can be kept high.

And in the hot water circulation line (5), at least the upper part of the liquid phase in the hot water tank (29) can always store hot water in the middle-high temperature range of about 90 ° C, so the absorption refrigerator (6) set to an appropriate capacity. As a result, it is possible to secure a sufficient amount of heat for continuous operation of the cold storage water, and therefore, it is possible to constantly store low-temperature cold water of about 7 ° C. in the cold water tank (43) of the cold water circulation line (7) at least in the lower part of the liquid phase. Sufficient energy is secured for the cooling that is performed with the time after boiling being shifted.

Thus, the steam (waste heat) generated during boiling can be effectively used as a heat source for cooling.

On the other hand, according to the invention of claim 2, when the predetermined low temperature cannot be obtained only by the absorption refrigerator (6), the liquid to be heat treated is complementarily cooled by low temperature cold water such as brine. It is possible to keep the cooling temperature of the heat treatment liquid low.

Further, in the invention of claim 3, since the heating device (47) and the cooling device (49) are provided on the hot water supply line and the cold water supply line of the absorption chiller (6), for example, at the start of the week. When the capacity for warming up is insufficient, even when the absorption refrigerator freezes abnormally, the heating source of the generator (32) can be sufficiently secured, and at the same time, the cold heat source of the cold water circulation line (7) can be sufficiently secured. It is possible to solve the lack of capacity and maintain the low temperature of the liquid to be heat treated.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 to FIG. 4 are device circuit diagrams of a heat treatment device for beer manufacturing process according to an embodiment of the present invention, wherein a boiling device (1), a cooling device (2), a heat recovery line (4), and warm water storage. A circulation line (5), an absorption chiller (6), a cold water circulation line (7), and a cooling circulation line (8) are provided, and the control device described below alternately performs heating and cooling with heat recovery. Each of these mechanisms will be sequentially described.

◎ Boiler (1) (Refer to Fig. 2), a predetermined amount of wort, which is the liquid to be heat-treated, is stored and heated for about 90 minutes at a constant cycle of about 180 minutes, for example, at 100 ° C under atmospheric pressure. Further, a plurality of boiling pots (3) as heating containers for heating the wort (3) are provided, and the heating operation is alternately and continuously performed as a whole.

Each of the boiling pots (3), (3) is formed in a closed container, and an exhaust duct (9) having an exhaust damper (10) is erected vertically from the top wall to perform a heat recovery operation. Fully operate the exhaust damper (10).

◎ Cooling device (2) (see Fig. 3), primary coil (12) for circulating the wort treated in the boiling kettle (3), two secondary systems for circulating cold cold water, for example, -4 ° C brine For cooling, consisting of coils (13), (13), a tertiary coil (14) for circulating cold water in the stored cold water tank (43), and a quaternary coil (15) for circulating city water, groundwater, etc. For example, two heat exchangers (11) corresponding to the boiling kettle (3) are provided so that heat exchange operation can be alternately performed. Quaternary coils (13), (13), (14), (15) are installed in series so that heat can be exchanged, and city water (20 ° C) flows through the wort at about 95 ° C after heat treatment. The coil (15) naturally cools it for about 1 hour, once lowers it to about 25 ℃, and then cools it to about 7 ℃. (14) and -4 ° C brine flows through one secondary coil (13) to cool to about 12 ° C, and another -4 ° C brine flows through to another secondary coil (13) to cool to about 5 ° C. It is like this.

In addition, a switching valve (16) and a flow control valve (17) for selecting the cooling heat exchangers (11) and (11) are respectively provided in the brine supply pipes of the two systems that supply brine in a circulating manner. hand,
It is possible to selectively operate the heat exchanger and adjust the cooling capacity.

◎ Heat recovery line (4) (see FIG. 2), heat which is branched from the middle of each exhaust duct (9), (9) and pulled out, and through a damper (19) opened during heat recovery operation Primary ducts (18) formed by forming recovery ducts (18), (18) and a chamber that can be filled with steam, and connecting the tops thereof to the outlets of the heat recovery ducts (18), (18) all at once. 21) Secondary coil (22), 3 in order from the upper part
A heat recovery heat exchanger (20) in which the secondary coil (23) and the quaternary coil (24) are arranged stepwise so that heat can be exchanged;
Extraction duct (27) with one end connected to the bottom of the next passage (21)
A heat exchanger (25) for cooling non-condensable gas interposed in the middle of the extraction duct (27), an extraction fan (26) having a suction side connected to the other end of the extraction duct (27), and the extraction air Fan (26)
And a filter (28) connected to the discharge side of.

The heat recovery line (4) is driven by an extraction fan (26) to fill the primary passageway (21) with water vapor generated at the boiling pot (3) at an atmospheric pressure of 100 ° C. to flow through the secondary coil (22). )
While heat is exchanged with water circulating between the hot water tank (29) described later and hot water of about 90 ° C,
After the steam becomes a low temperature liquid, it is drained from the bottom of the primary passageway (21) as drain.

Further, the uncondensed malodorous gas mixed with the water vapor is cooled by the heat exchanger (25), then adsorbed by the extraction fan (26) and the filter (28) and exhausted.

In addition, a small amount of fresh water is sent to the tertiary coil (23) to become warm water of about 90 ° C. by heat exchange with steam, and then stored in a tank (not shown) and used as, for example, sterilizing hot water.

On the other hand, when the heat recovery operation is interrupted when a required amount of high temperature water is stored in the hot water tank (29), it flows between the quaternary coil (24) and the cooling tower (37). The heat exchange between water and water vapor is performed to perform heat treatment for exhausting water vapor.

◎ The hot water circulation line (5) (see FIG. 2), the hot water outlet and the hot water return port of the secondary coil (22) of the heat recovery heat exchanger (20) are located above the hot water tank (29). The hot water inflow port provided and the hot water outflow port provided in the lower part are respectively connected by a pipe to form a circulation circuit, and a primary side hot water pump (30) is provided in the middle of the pipe. 90 ° C due to heat recovery in the secondary coil (22)
The hot water heated to a high temperature that does not result in boiling is sent from the hot water outlet to the hot water inlet provided at the top of the hot water tank (29), and the hot water whose temperature has dropped to 75 ° C at the bottom of the hot water tank (29) It is provided so as to return from the hot water outlet provided in the lower portion of the tank (16) to the hot water return port of the secondary coil (22) for reheating.

However, the warm water tank (29) is a closed container with a vertical structure, and its peripheral wall is covered with a heat insulating material for high heat retention, and has an elongated shape with a large height dimension compared to the body diameter. At the same time, a baffle plate (31) made of a perforated plate or the like is horizontally laid horizontally at appropriate intervals to partition the chamber into a plurality of layers arranged vertically.

The hot water outlet and the hot water return opening are provided at the bottom of the tank while the hot water inlet and the hot water outlet are provided at the top of the tank.

The hot water tank (29) thus configured has a predetermined amount of 90 ° when hot water of 90 ° flows into the tank through the hot water inlet and is filled.
° Although hot water is stored, it is discharged from the hot water outlet to the load side and the hot water whose temperature has dropped to 75 ° C is returned to the hot water return port. The amount will gradually increase.

The flow state of the hot water in the tank in this case is the baffle plate (31).
The presence of the water causes the movement according to the gentle weight without stirring, that is, the movement with the temperature film existing due to the difference in the specific gravity due to the temperature, and therefore the warm water stored in the tank. It is possible to supply high-temperature water at a constant temperature of 90 ° C from the hot-water outlet until almost the entire amount of is replaced with low-temperature water after heat exchange on the load side.

The hot water tank (31) can of course be used as a tank for storing low-temperature cold water. In this case, the positional relationship between the water intake, the water inlet and the water return, and the water outlet is reversed. Of course, there is no difference in the basic structure, and it goes without saying that the cold water tank (43) described later corresponds to this example.

◎ Well-known refrigerant cycle and solution cycle that have absorption refrigerator (6) (see Fig. 4), generator (32), condenser (33), evaporator (34) and absorber (35) as main components. Is an absorption refrigeration system with a refrigerant generator (3
The hot water tank (2
While using the 90 ° C hot water in 9), the heat generated when the refrigerant is absorbed in the concentrated solution and when the refrigerant is liquefied in the absorber (35) is supplied to the pipe having the cooling water pump (41). After that, the cooling tower (38) is provided so as to release it into the atmosphere.

In the above refrigerator, a heating coil (36) attached to a generator (32) is connected to a pipe having a secondary side hot water pump (39) and a flow control valve (40). The hot water outlet and the hot water return port of (29) are cyclically connected.

◎ Cold water circulation line (7) (see FIG. 4), cold water coil (42) attached to the evaporator (34) and cold water tank (43) having the same structure as the hot water tank (29) described above. And are circulated through a pipe having a primary side cold water pump (44) and a pipe having a cooling device (49), and the cold water is cooled to 7 ° C by a cold water coil (42). Is sent into the tank from the cold water inlet provided at the bottom of the cold water tank (43), and
Water whose temperature has risen to 25 ° C. is led out from a cold water outlet provided in the upper part of the tank and sent to the cold water coil (42) for recooling.

◎ Cooling circulation line (8) (see FIG. 3), the cold water tank (43) and two heat exchangers for cooling (1
The 3rd coil (14) and (14) in 1) and (11) are 2
Secondary side cold water pump (45) and both tertiary coils (14), (14)
The switching valve (46) for selecting is connected in a circulating manner through a pipe, and the low temperature cold water of 7 ° C in the cold water tank (43) is provided at the lower part of the tank from the cold water outlet to one of the tertiary coils. Water sent to (14) and having its temperature increased to about 25 ° C by exchanging heat with the wort on the load side in the tertiary coil (14) passes through a cold water return port provided at the top of the tank, and then a cold water tank (43) It is supposed to be returned inside.

However, the cold water tank (43) is the hot water tank (29) described above.
A device capable of exhibiting a heat storage function similar to the above, and substantially the entire amount of cold water of 7 ° C stored in the tank is stored in the tertiary coil (1
It is possible to supply cold water at 7 ° C from the cold water outlet until it is replaced with water at 25 ° C after heat exchange in 4).

The structure of the embodiment apparatus has been described above.
2) Heating coil (36) inlet end and hot water tank (29)
A heating device (47) consisting of a water-to-water heat exchanger is installed at a location downstream of the secondary side hot water pump (39) in the pipeline connecting the hot water outlet of Accordingly, hot water is supplied from the hot water boiler (48) to raise the temperature of the hot water flowing into the heating coil (36), while the evaporator (3
4) Cold water coil (42) Outflow side end and cold water tank (43)
A cooling device (49) consisting of a water-to-water heat exchanger is provided in a pipe line connecting to the cold water inflow port, and is a cold heat source of the cooling device (2) as required-4. The temperature of cold water flowing into the cold water tank (43) can be lowered by supplying brine of ℃ to the water-to-water heat exchanger (49). This structure is an example according to claim 3 The above-mentioned devices (47) and (49) are operated when the freezer (6) abnormally stops or when the capacity is insufficient during warming up (see FIG. 4).

Next, a control device that controls the heat treatment operation involving heat recovery of the device having the above-described configuration and an operation mode thereof will be described below with reference to a flow diagram.

The time required for saccharification, for example, 90 minutes of charging, followed by 30 minutes of primary boiling, and then holding of the wort for 5 hours is boiled to 100 ° C for 90 minutes in a boiling pot (3) for secondary boiling.

The secondary boiling in the boiling pot (3) is performed with a period of 180 minutes, for example.

The damper (19) of the corresponding boiling kettle (3) is fully opened based on the charging start signal (a) and the charging frequency signal (b) transmitted by charging the one boiling kettle (3) (step). (C)).

At the same time, the pressure in the boiling pot (3) and the temperature of the gas phase part are detected by the pressure detector (50) and the temperature detector (51) provided in the heat recovery duct (18).

Steam at atmospheric pressure of 100 ° C is generated in the boiling kettle (3), but at this point there is no differential pressure from atmospheric pressure, so it is judged that the pressure is normal (step (d)) The deformed extraction fan (26) is driven (step (e)).

In this case, if the pressure difference from the atmospheric pressure in the boiling kettle (3) is larger than a predetermined value, for example ± 20 mm water column, the extraction fan (26) is stopped (step (f)), and the damper (1)
9) Close (step (g)).

Here, steps (a), (c), and (g) correspond to damper control means, and steps (c), (d), and (f) correspond to extraction fan control means.

Steam at atmospheric pressure of 100 ° C generated in the boiling pot (3) by opening the damper (19) and driving the extraction fan (26) is recovered by the heat recovery line (4), and the primary side hot water pump (3)
By the operation of 0), the recovered heat source is accumulated as hot water in the hot water tank (29) of the hot water circulation line (5) via the secondary coil (22).

When the temperature detector (51) detects that the water vapor temperature in the heat recovery line (4) has reached a set temperature, for example, 100 ° C (step (h)), the pumps (39), (41), (4)
Run 4) (step (ri), (nu),
(L)), and the absorption refrigerator (6) is operated (step (wo)).

Simultaneously with this operation, the flow control valve (40) is opened (step (wa)), operation control is started (step (f)), and temperature detection is performed to detect the outlet water temperature of the cold water coil (42) of the evaporator (34). The refrigeration load is judged by the temperature signal of the device (52) (step (Yo)), and the valve opening of the flow control valve (40) is controlled (Steps (T), (R), (S)), The amount of 90 ° C. hot water flowing into the heating coil (36) in the generator (32) is adjusted.

Thus, the cold water in the cold water tank (43) in the cold water circulation line (7) is cooled to 7 ° C. to store cold heat.

Here, steps (ri) to (so) correspond to the refrigerator control means.

Then, when the secondary boiling is completed, the secondary boiling of another boiling pot (3) is subsequently performed, so that both the heat recovery and freezing operations described above are continued.

And a 3-position temperature detector (5
3) and a 3-position temperature detector (5) provided in the cold water tank (43)
The temperature levels in both tanks are detected by (4) and (steps (a) and (la)). When the temperature level is high, the primary side hot water pump (30) is stopped (step (m)) and the primary side. Operate the cold water pump (44) (step (e)), while
When the temperature level is low, the operation is reversed (step (c) and stopped (step (no)).

The wort after the second boiling is cooled by well water by the fourth coil (15), and when the temperature drops to about 25 ° C, a wort cooling start signal is issued (step ( )), After switching the switching valve (46), the secondary side cold water pump (45) is operated (step (YA)) to cool the cold water at 7 ° C in the cold water tank (43) to the tertiary coil ( Send to 14), 1
Cool the wort flowing in the next coil (12).

Note that steps (a), (m), and (c) are hot water circulation control means, steps (wo), (no), and (o) are cold water circulation control means, and steps (k) and (ya) are one-stage cooling. They correspond to the control means, respectively.

In this way, the steam generated by boiling that is intermittently repeated for 90 minutes with a cycle of 180 minutes is effectively recovered, and the absorption refrigerator (6) is continuously operated to cool the cooling heat after boiling. It is possible to secure the source.

In this case, the hot water tank (29) is formed in a vertical structure, and the hot water is introduced and led out so that the temperature boundary film can be formed by the difference in specific gravity due to the temperature difference, so it occurs intermittently at intervals. The absorption chiller can be continuously operated by using steam as a heat source, and cold water at a constant low temperature can be continuously supplied to the cold water tank (43) as well.

By the way, since the wort at a predetermined low temperature, for example, 5 ° C. cannot be obtained only by cooling with the cold water stored in the cold water tank (43), the backup cooling by the brine is performed by steps (a), (b) and (f). .

That is, one of the two secondary coils (13) and (13) is connected to the brine supply line by selectively switching the switching valve (16), and the opening control of one flow control valve (17) is performed.
You just have to close it.

If the low temperature is still not obtained, the switching valve (16) is switched and the flow rate control valve (17) is opened and closed in the same manner (steps (C), (D),
(Te)).

The steps (MA) to (TE) correspond to the additional cooling control means according to the second aspect of the invention.

On the other hand, at the time of the first preparation after the holiday, it is difficult to quickly and sufficiently secure the heat source of the generator (32) in the absorption refrigerating machine (6), which requires a considerable time to start up, by the heat recovery method alone. When a warm-up signal is issued (step (a)), both temperature detectors (5
The temperature level in each tank (29), (43) is detected by 3), (54) (steps (SA), (KI)), and the temperature level is high in the hot water tank (29) and cold in the cold water tank (43). )
So that they are kept at low levels respectively, the heating device (47),
Flow control valves (5) provided on the primary side of the cooling device (49)
5), (56) to control the valve opening (step (you),
(Shi)).

Thus, even when the absorption refrigerating machine (6) is in operation, when the refrigerating capacity cannot be sufficiently secured due to an abnormal state, etc., the required heating source and cooling source can be obtained.

(Effects of the Invention) The present invention continuously recovers steam generated periodically and intermittently as a whole to store heat in the state of high-temperature water, and further, a temperature film intervenes between the high-temperature and low-temperature hot water. By storing the hot water in a hot water tank (29) that does not mix with each other, it is possible to secure high-temperature water sufficient to continuously operate the absorption refrigerator (6), and to cool the absorption refrigerator (6). Since the cold water tank (43) is also formed in the same manner as the hot water tank (29), it is possible to secure a sufficient amount of cold water necessary for cooling after boiling.

In this way, the cooling process related to boiling, cooling equipment for cooling, etc., was changed to an absorption chiller (6) operated by heat recovery of atmospheric pressure steam generated in the boiling process. A significant reduction,
It is a huge amount that contributes to energy saving.

In addition, the control device performs the automatic pressure control, the heat recovery operation, the absorption refrigeration operation, and the cooling operation of the liquid to be heat-treated to keep the pressure in the heating vessels (3) and (3) constant. Therefore, a processing device having high safety and high heat recovery efficiency can be provided.

Furthermore, in addition to the absorption refrigerator (6), by providing an additional cooling control means for cooling with low temperature cold water, low temperature cooling can be performed while keeping the running cost to a minimum.

In addition, a heating device (47) for securing the generator heat source of the absorption chiller (6) and a cooling device (49) for compensating for the insufficient capacity of the evaporator are additionally provided, so that when warming up or when an abnormality occurs. Insufficient cooling capacity can be complemented, so that the liquid to be heat treated can be stably maintained at a low temperature.

[Brief description of drawings]

FIG. 1 is a block diagram showing a structure according to an example of the present invention, FIGS. 2 to 4 are device circuit diagrams of respective main parts, and FIGS. 5 to 7 are flow lines for explaining the operation of a control device. It is a figure. (1) …… Boiler, (2) …… Cooler, (3) ……
Heating container, (4) ... heat recovery line, (5) ... hot water circulation line, (6) ... absorption type refrigerator, (7) ... cooled water circulation line, (8) ... cooling circulation line, (11) ……
Cooling heat exchanger, (12) …… Primary coil, (13) …… 2
Next coil, (14) …… Third coil, (18) …… Heat recovery duct, (19) …… Damper, (20) …… Heat recovery heat exchanger, (21) …… Primary passage, (22) …… Secondary coil, (2
6) …… Bleed fan, (29) …… Hot water tank, (32)…
… Generator, (33) …… Condenser, (34) …… Evaporator, (3
5) …… Absorber, (36) …… Heating coil, (42) …… Cold water coil, (43) …… Chilled water tank, (47) …… Heating device, (49) …… Cooling device.

Claims (3)

[Claims] 1. A plurality of heating containers (3), such as a boiling pot, for heating a liquid to be heat-treated in a housing at 100 ° C. under atmospheric pressure by repeating a fixed cycle for a fixed time, alternately and as a whole. A boiling device (1) for continuously performing a heating operation and a liquid to be heat treated by the boiling device (1) are alternately introduced into cooling heat exchangers (11), (11) to obtain low-temperature cold water. In a heat treatment apparatus comprising a cooling device (2) for cooling by heat exchange with a heat recovery duct (a) provided with a damper (19) and connected to a gas phase part of each heating container (3), (3), respectively. 18), (18), a heat recovery heat exchanger (2) in which a primary passageway (21) is collectively connected to the heat recovery ducts (18), (18).
0), extraction fan (26) connected to the primary passage (21)
And the atmospheric pressure generated in each heating vessel (3), (3)
A heat recovery line (4) for exchanging heat between 100 ° C. steam and water flowing through the secondary coil (22) of the heat recovery heat exchanger (20), and the heat recovery heat exchanger ( The hot water inlet and the hot water return port of the secondary coil (22) of 20) are provided at the upper part of a vertically long structure hot water tank (29) capable of forming and storing a temperature boundary film due to the difference in specific gravity due to temperature. And a hot water circulation line (5), which is connected to the hot water outlets provided at the bottom and the bottom, respectively, and is capable of storing a predetermined amount of hot water that does not reach boiling in the hot water tank (29), and a generator. (32), condenser (33), evaporator (34) and absorber (35), and the heating coil (36) of the generator (32) is provided at the upper part of the hot water tank (29). And absorption-type refrigerators (6) that are cyclically connected to the hot water return ports provided in the lower part
And a cold water tank (43) having a vertically long structure formed in the same manner as the hot water tank (29), with a cold water inlet provided at a lower portion and a cold water outlet provided at an upper portion as a cold water coil (42) for the evaporation (34). And a cold water circulation line (7) capable of storing low-temperature cold water in the cold water tank (43), and a cold water outlet and an upper part provided in the lower part of the cold water tank (43). The cold water return port provided is cyclically connected to the cooling heat exchangers (11) and the tertiary coil (14) of the cooling heat exchanger (11), and the cooling heat exchangers (11) and (11) are primary. Coil (1
2) The cooling circulation line (8) for cooling the liquid to be heat-treated, the dampers (19) of the heat recovery ducts (18) and (18) are opened, the extraction fan (26) is operated, and The operation of the cooling device (2), the hot water circulation of the hot water circulation line (5), the freezing operation of the absorption refrigeration system (6), the cold water circulation of the cold water circulation line (7) and the cooling operation of the cooling circulation line (8). And a control device for performing the
Corresponding dampers (19), according to the preparation start signal and preparation frequency signal transmitted when operating the heating containers (3), (3)
Damper control means for opening (19), and damper (19),
Either one of (19) is opened, and the extraction fan (26) is operated when the abnormal differential pressure signal is not transmitted, and the extraction fan (26) is stopped by transmitting the abnormal differential pressure signal. Extraction fan control means and heat recovery duct (1
When the water vapor temperature after passing through the dampers (19) of 8) and (18) is higher than the set value and when the hot water of the set temperature is stored in the hot water tank (29), the absorption refrigerator (6 ) Is operated and the refrigerator control means for increasing or decreasing the circulating amount of hot water between the hot water tank (29) and the heating coil (36) of the generator (32) according to the refrigeration load, and the hot water tank (29). Hot water circulation control means for adjusting the circulating hot water amount in the warm water circulating line (5) so that a predetermined temperature and a predetermined amount of warm water are stored in
As cold water of a predetermined temperature is stored in the cold water tank (43),
Cold water circulation control means for adjusting the amount of circulating cold water in the cold water circulation line (7), and a cooling start signal is transmitted to require cooling after the heat treatment, and the cold water tank (4
An exhaust heat recovery type heat treatment apparatus comprising: a cooling control means for circulating cold water in a cooling circulation line (8) by storing cold water of a predetermined temperature in 3). 2. A heat exchanger (11) for cooling low temperature cold water when the absorption refrigeration type (6) has a higher cooling temperature than a predetermined temperature.
The exhaust heat recovery system heat treatment apparatus according to claim 1, wherein additional cooling control means for circulating the secondary coil (13) of (11) is added to the control device. 3. A heating device (47) is provided in a pipe line connecting a heating coil (36) of a generator (32) and a hot water outlet of a hot water tank (29), and an evaporator (34). The exhaust heat recovery type heat treatment apparatus according to claim 1 or 2, wherein a cooling device (49) is provided in a pipe line connecting the cold water coil (42) and the cold water inlet of the cold water tank (43).