JPH0152661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field, Object) The present invention relates to a circulating hot water supply device for transferring heat between a heat source side and a heat utilization side using water as a heat medium.

(Background Art) Conditions on the heat source side in a waste heat recovery plant are not necessarily constant and continuous, but are generally irregular and discontinuous. For this reason, if the heat source side and the heat utilization side are directly connected, the inconsistencies and discontinuities on the heat source side will appear as inconsistencies and discontinuities on the heat utilization side. For example,
A general-purpose power generation plant that can be used as a waste heat recovery plant has the following problems: 1) The power generation output cannot be obtained at a constant level, 2) The partial load operation rate is large and the average thermal efficiency decreases, and 3) The plant size must be set at the maximum heat source. It becomes excessive.

This has a large negative impact on the entire plant.

Therefore, methods have been considered to compensate for the irregularity and discontinuity of the heat source side conditions to some extent and supply hot water as constant as possible to the heat utilization side. There is something to be done. This is heat source side A and heat utilization side B
This is an improved circulating hot water supply device C shown in FIG. 1 for transferring heat between If it is above, high temperature level tank 01,
If it is lower than that, it is introduced into the low temperature level tank 02, and the low temperature water 4 returned from the heat exchange section 3 on the heat utilization side is returned to the low temperature level tank 02, and a temperature level control valve 03 is provided so as to do so.

In such a device, if the charge/non-charge cycle of the heat source is repeated in the same type and the temperature increase width during charging is almost the same, the temperature of the hot water in the high temperature level tank is made uniform. Although it is a simple equipment, it is true that a large effect can be obtained, but in cases where the charging/non-charging cycle is unpredictable and irregular, and the temperature rise range during charging fluctuates greatly. , 1. There is a limit to the uniformity of the temperature of the hot water supplied to the heat utilization side. 2. The tank capacity becomes too large. 3. It is difficult to set the hot water pump flow rate. 4. There is a risk that one of the high and low temperature level tanks may become empty. This may cause inconveniences such as . These drawbacks are due to the fact that there is only one temperature level control valve 03, that is, there is only one high and low temperature level tank, and they are independent from each other.

(Purpose, Structure) The purpose of the present invention is to provide a high-temperature continuous water storage circulation hot water supply device that can eliminate all the defects of conventional devices using high-temperature level tanks, and its structure includes heat exchange on the heat source side. A three-way temperature control valve and hot water storage tank to separate the high-temperature water and low-temperature water, a hot water pump on the heat utilization side, a heat exchanger on the heat utilization side, a hot water pipe connecting the hot water pump on the heat source side and each of the above devices. In a high-low temperature continuous water storage circulating hot water supply device equipped with
The hot water storage tank is divided into a single hot water storage tank and includes a plurality of room groups in which adjacent rooms with different temperature levels are partitioned so that they can communicate with each other, and the heat source side heat exchanger and the hot water storage tank are connected to each other. In between, if the hot water temperature is lower, the temperature level is lower in the room,
It is characterized by having a plurality of three-way temperature control valves for introducing hot water into rooms with higher temperature levels.

(Operations and Effects) The present invention divides one tank, but forms groups of rooms that are subordinate to each other, and the high-temperature water after heating is introduced into the most appropriate room that matches the temperature, and circulation is possible between the rooms. Therefore, both the hot water returning to the heat source side and especially the hot water supplied to the heat utilization side, the temporal rate of change in temperature is reduced and averaged out.
The equipment system can be designed to maintain a high average temperature of the intermediate medium supplied to the heat utilization side, which is one of the dominant factors in determining the quality of waste heat recovery plants. This double or triple effect can be obtained under the condition that it is extremely unlikely that any room will be left empty.

(Example) Fig. 3 shows the first example. In this figure, 1 is a heat source or a heat exchanger on the heat source side, 2 is high temperature water discharged from the heat source side heat exchanger 1, and 3 is a heat source. The utilization part or heat utilization side heat exchanger, 4 is low temperature water after heat recovery returned from the heat utilization side, and the heat source is a batch type heat generation source such as waste heat of a converter, for example.
The heat utilization section is, for example, a heat exchange section of a fluorocarbon turbine. 5 is a room group consisting of rooms with multiple temperature levels, which are partitioned and divided by partitions 6, but because they are divided so that they can communicate with each other, 1
Two hot water storage tanks F are formed.

High-temperature water 2 after being heated from the heat source side heat exchanger 1 and low-temperature water 4 after heat recovery returning from the heat utilization side heat exchanger 3
Both are cascaded into rooms with higher temperature levels if they are hotter and into rooms with lower temperature levels if they are cooler.

In the illustrated example, the temperature level increases in order from the left side, the first room F ₁ has a temperature below T ₁ , and the second room F ₂ has a temperature higher than T ₁ and T ₂
The lower one, the third room F ₃ has a temperature T ₂
higher than T ₃ and lower than T ₃ , and in the fourth room those whose temperature is higher than T ₃ are introduced.
The highest temperature water in the room at the highest temperature level is supplied to the heat exchanger 3 on the heat utilization side at a flow rate G ₂ by the hot water pump 7 on the heat utilization side, but it is not necessarily limited to the hot water at the highest temperature level. It is also possible to supply hot water at a level of . In addition, the lowest temperature water in the room with the lowest temperature level is supplied to the heat source side heat exchanger 1 by the heat source side hot water pump 8 at a flow rate G ₁ , but it is not necessarily limited to the lowest temperature level hot water, and the second level hot water may be supplied to the heat source side heat exchanger 1, and for example, it may be possible to arbitrarily select which level of hot water to supply by controlling the opening and closing of a valve. Generally, _the pump ₇ ,
Determine the capacity of 8.

If the partition 6 is provided to allow circulation between the upper part of the room F _o on the lower temperature side and the lower part of the room F _o +1 on the higher temperature side, the natural circulation of hot water inside each room will be improved. By using
It is excellent in maintaining high temperature properties on the higher temperature side, especially in room _F4 at the highest temperature level.

In order to introduce high temperature water 2 and low temperature water 4 into rooms F ₁ to F ₄ in accordance with each temperature level, the temperature T ₁ ,
A three-way valve where the outlet side switches between T ₂ and T ₃ .
VH ₁ , VH ₂ , VH ₃ and VL ₁ , VL ₂ , VL ₃ are used. These valves are sometimes equipped with a function that allows them to switch independently of the temperature of the flowing hot water. It is also conceivable to make the switching operation temperatures of the sending-side valve VH _o and the return-side valve VL _o different.

In this embodiment, when the high-temperature water 2 after being heated is introduced into a room with a lower temperature level, the hot water in the introduced room is sequentially expelled to the adjacent high-temperature side room, and conversely, heat recovery When the later low-temperature water 4 is introduced into a room with a higher temperature level, the hot water in the introduced room is sequentially expelled to the adjacent lower-temperature room, so for example, the high-temperature water 2 after being heated is When introduced into the first level room F ₁ , the fourth
Since hot water from the third level room enters the room at the highest temperature level, the room at the highest temperature level maintains its high temperature and keeps the maximum temperature low without a sudden temperature drop. The temperature level of the room maintains low temperature, there is no sudden temperature rise, and the minimum temperature can be kept high. Therefore, the average heat exchange rate is high in both the heat source side heat exchanger 1 and the heat utilization side heat exchanger 3, and there is no room left empty, which reduces the overall design scale of the plant. Can be made smaller.

Figure 3 shows the basic model of the present invention, but depending on the range of temperature change of the heated water and the returned hot water, the redundant three-way valve may be omitted, and the partition dividing the hot water tank is not necessarily at the hot water level. It doesn't even have to be buried underneath. This is the second embodiment, which is shown in FIG. In this embodiment, the water surface level in each room can be made different, and is of an overflow type. In this example as well, the room on the colder side
Flow is allowed between the upper part of F _o and the lower part of room F _o +1 on the higher temperature side. In this example, the returning low temperature water 4 is always returned to the lowest level room _F1 , and is used under conditions where there is no need to create a boundary between higher and lower temperature water 4. Ru. This is applied when the return low temperature water 4 is limited to lower temperature water. Three-way valve VL ₁
This is an example applied when it can be fixed to one of the two outlets of the three-way valve VL ₁ .
are not shown because they are unnecessary or inoperative. The cases in which high temperature water 2 is introduced into the first, second, and third level rooms are indicated by symbols A, B, and C in the figure, respectively. In case A, the water level in room _F1 rises and _F2 remains constant.
F ₃ falls (because G ₁ > G ₂ ). If this condition continues, the overflow of F ₁ will flow into the lower part of F ₂ , and the overflow of the upper part of F _{2 will flow into the lower part of F 2} .
Flows into the lower part of _F3 . In case (b), the level of F ₁ decreases, and the overflow of F ₂ flows into the lower layer of F ₃ , increasing the level of F ₃ . If this state continues, F ₂ and F ₃ reach the same level and rise together, eventually overflowing to F ₁ . For Ha, the level of F ₁ decreases, F ₂ remains the same, and F ₃
level increases. If this condition continues, F ₂ and
F ₃ becomes the same level and finally overflows to F ₁ .

In this example as well, the overflow is sequentially driven to the next room as in the first embodiment, so the highest temperature level of high temperature is maintained, and the lowest level of low temperature is also maintained, and in both cases, sudden temperature changes are prevented. It is equally effective in that there is no risk of running out, but
Under conditions where the overflow rate is low,
There is no mixing, and the above-mentioned high temperature and low temperature properties are better maintained.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of a waste heat recovery plant, Figure 2
The figure is a conceptual circuit diagram showing an example of a conventional circulating hot water supply device, FIG. 3 is a conceptual circuit diagram showing a first embodiment of the present invention, and FIG. 4 is a conceptual circuit diagram showing a second embodiment. 1... Heat source side heat exchanger, 2... High temperature water after temperature rise, 3... Heat utilization side heat exchanger, 4... Low temperature water after heat recovery, 5... Room group, 6... Hot water tank Partition, 7
... Heat utilization side hot water pump, 8 ... Heat source side hot water pump, F ... Hot water storage tank, F ₁ - F ₄ ... Room, VH ₁ ,
VH ₂ , VH ₃ , VL ₁ , VL ₂ , VL ₃ ... Temperature control three-way valve, G ₁ ... Heat source side hot water flow rate, G ₂ ... Heat utilization side hot water flow rate.

Claims (1)

[Scope of Claims] 1. A heat exchanger on the heat source side, a three-way temperature control valve for separating high temperature water and low temperature water, a hot water storage tank, a hot water pump on the heat utilization side, a heat exchanger on the heat utilization side, and hot water on the heat source side. In a high-low temperature continuous water storage circulation hot water supply device equipped with hot water pipes connecting the pump and each of the above devices, the hot water tank is divided into one hot water tank so that adjacent rooms with different temperature levels can communicate with each other. A plurality of partitioned room groups are provided, and between the heat source side heat exchanger and the hot water storage tank, if the temperature of the hot water is lower, the room is placed in a room with a lower temperature level, and if the temperature of the hot water is higher, the room is placed in a room with a higher temperature level. A high and low temperature continuous water storage circulating hot water supply device characterized by being equipped with a plurality of three-way temperature control valves for introducing hot water into a room. 2. The hot water distribution system according to claim 1, wherein the hot water distribution mode between the adjacent rooms is such that hot water can flow between the upper part of the room with a lower temperature level and the lower part of the room with a higher temperature level. Low-temperature continuous water storage circulating hot water supply device. 3. The high-temperature continuous water storage circulating hot water supply device according to claim 1 or 2, wherein the hot water distribution mode between the adjacent rooms is an overflow type.