CN217031659U - High-temperature hot water grading self-cooling circulation system - Google Patents
High-temperature hot water grading self-cooling circulation system Download PDFInfo
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- CN217031659U CN217031659U CN202121409687.6U CN202121409687U CN217031659U CN 217031659 U CN217031659 U CN 217031659U CN 202121409687 U CN202121409687 U CN 202121409687U CN 217031659 U CN217031659 U CN 217031659U
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Abstract
A high-temperature hot water grading self-cooling circulation system comprises a lithium bromide absorption type unit, a water-water heat exchanger, a primary cooling water pump, a high-temperature cooling tower and a conventional cooling tower; the lithium bromide absorption type unit comprises a generator, a condenser, an absorber and an evaporator; the water inlet of the generator is connected with a hot water inlet pipeline, the hot water outlet end of the generator is connected with the hot water inlet of the water-water heat exchanger, the cooling water inlets of the water-water heat exchanger and the lithium bromide absorption type unit are connected with the cooling water electric three-way valve and the first-stage cooling water pump, and the inlet of the first-stage cooling water pump is respectively connected with the high-temperature cooling tower and the conventional cooling tower. The utility model can selectively adjust the flow and the flow direction of the electric three-way valve of the cooling water according to the temperature of the wet bulb of the outdoor environment, not only can ensure that the high-temperature cooling tower does not cause soft scale and filler softening, but also can save the power consumption of cooling, can save the power consumption of electric refrigeration and cold-compensation operation and reduce the investment cost of power distribution.
Description
Technical Field
The utility model relates to a cooling circulation system, in particular to a high-temperature hot water grading self-cooling circulation system.
Background
In the industrial production process, water with the temperature of more than 60-80 ℃ is cooled to the temperature of below 20-30 ℃ for recycling, and the following two common methods are mainly adopted:
the first mode is as follows: as shown in fig. 1: directly radiating hot water (such as 65 ℃) by using a high-temperature cooling tower 1 and then cooling to 20-30 ℃; however, when the temperature of the environmental wet bulb is higher, the cooling water cannot be cooled to below 30 ℃, at this moment, the electric refrigerator 4 needs to be adopted for auxiliary cooling, namely, the water-water heat exchanger 3 is added at the side of the high-temperature cooling tower 1, the inlet and outlet ends of the heat exchange tube of the water-water heat exchanger 3 are connected with the electric refrigerator 4, the shell side inlet end of the water-water heat exchanger is connected with the output end of the high-temperature cooling tower 1 through the cooling water pump 2, the electric refrigerator 4 is also in bidirectional connection with the conventional cooling tower 5, and the output end of the conventional cooling tower is connected with the electric refrigerator 4 through the cooling water pump 6. The hot water is cooled by the high-temperature cooling tower and then enters the water-water heat exchanger to exchange heat with the electric refrigerator, so that the temperature of the hot water is further reduced to be below 30 ℃.
The cooling mode adopts a high-temperature cooling tower and an electric refrigerator for auxiliary cooling, most of heat is cooled through the high-temperature cooling tower, the insufficient part adopts a cold supplement mode, the temperature difference of hot water of the system is large, the flow is small, and the energy consumption of a cooling water pump of the whole system is reduced. Under the condition that the temperature of the cooling water is lower in winter, the cooling can be realized by directly cooling at high temperature. However, the main disadvantages of this system are: (1) the conventional cooling tower is easy to have the problems of filler softening and hard scale formation in the tower when the temperature of hot water entering the cooling tower is higher than 55 ℃. The high-temperature cooling tower is an open system, hot water directly contacts with air, and some microorganisms or harmful substances in the air easily enter a hot water circulating system to cause soft scale. (2) When the temperature of the environment wet bulb is high, an electric refrigerator is needed for cold supplement, related equipment (such as a cooling water pump, electric refrigeration and the like) and pipelines are added, and the power distribution investment of the equipment is needed to be increased.
The second mode is as follows: as shown in fig. 2: the system consists of a hot water type lithium bromide absorption unit, a water-water heat exchanger 5, a conventional cooling tower 6 and a cooling water pump 7, wherein the hot water type lithium bromide absorption unit comprises a generator 1, a condenser 2, an absorber 3 and an evaporator 4. The system utilizes 60-80 ℃ hot water to enter a generator 1 of the lithium bromide absorption type unit to drive the unit to operate, the hot water enters a water-water heat exchanger 5 after being cooled and is cooled by cooling water, and finally the hot water enters an evaporator of the lithium bromide absorption type unit and is cooled to 20-30 ℃. The medium in the shell side of the water-water heat exchanger 5 circulates with a conventional cooling tower 6.
The system directly adopts hot water to drive the unit, does not need to be provided with an electric refrigerator in the figure 1, and saves the operating cost and the power distribution investment; the hot water circulation is separated from the cooling water system by the water-water plate type heat exchanger, and the hot water system has the advantages of no scaling and the like. However, the disadvantages of this system are: when the temperature of the cooling water is lower in winter, the system can not be directly cooled through a high-temperature cooling tower like the system in FIG. 1, so that the difference between the flow rates of the cooling water of the two systems is larger. For example, with hot water at 65/25 ℃, the flow rate of cooling water (65/25 ℃) in the high-temperature cooling tower 1 in fig. 1 is 5.7 times of the flow rate of cooling water (37/30 ℃) in the conventional cooling tower 6 in fig. 2, and the power consumption of the cooling water pumps of the two actual schemes is 5 times different, so that the power consumption of the system is greatly increased if the system is operated for a long time.
Therefore, in view of the above two ways, the present application is directed to solving the technical problems: on the basis of preventing the hot water system from scaling and reducing the equipment power distribution investment, the problem that a cooling water pump of the system is not energy-saving in the running process in winter can be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide the high-temperature hot water grading self-cooling circulating system which has a good energy-saving effect, consumes less power and prevents hot water from scaling.
The technical scheme of the utility model is as follows: a high-temperature hot water grading self-cooling circulation system comprises a lithium bromide absorption type unit, a water-water heat exchanger, a primary cooling water pump, a high-temperature cooling tower and a conventional cooling tower; the lithium bromide absorption type unit comprises a generator, a condenser, an absorber and an evaporator; the water inlet of the generator is connected with a hot water inlet pipeline, the hot water outlet end of the generator is connected with the hot water inlet of the water-water heat exchanger, and the hot water outlet of the water-water heat exchanger is connected with the water inlet of the evaporator; the cooling water inlet of the water-water heat exchanger and the lithium bromide absorption type unit is connected with the cooling water electric three-way valve and the one-level cooling water pump, and the inlet of the one-level cooling water pump is respectively connected with the high-temperature cooling tower and the conventional cooling tower.
Furthermore, a water outlet of the evaporator is connected with a hot water outlet pipeline.
Furthermore, the water outlets of the conventional cooling tower and the high-temperature cooling tower are divided into two branches by a primary cooling water pump, and one branch is connected with a cooling water inlet of an absorber of the lithium bromide absorption type unit; the other branch is connected with a cooling water inlet of the water-water heat exchanger.
Further, a cooling water outlet of the water-water heat exchanger is connected with a high-temperature cooling tower; and a cooling water outlet of the lithium bromide absorption type unit condenser is connected with a conventional cooling tower.
Further, the high-temperature cooling tower and the conventional cooling tower are connected in parallel or in series.
Further, the parallel connection mode of the high-temperature cooling tower and the conventional cooling tower is as follows: a pipeline is additionally arranged between a cooling water outlet of the water-water heat exchanger and a water inlet of the high-temperature cooling tower, a first shut-off valve is arranged on the pipeline, a pipeline is also additionally arranged between the cooling water outlet of the water-water heat exchanger and a cooling water outlet of the condenser, and a second shut-off valve is arranged on the pipeline.
Further, the series connection mode of the high-temperature cooling tower and the conventional cooling tower is as follows: a second-stage cooling water pump is arranged between the water outlet of the high-temperature cooling tower and the water inlet of the conventional cooling tower, and a third shut-off valve is arranged between the water outlet of the high-temperature cooling tower and the first-stage cooling water pump.
Further, a temperature sensor is arranged at the water outlet end of the evaporator.
Furthermore, the control of the electric three-way valve of the cooling water and the temperature of the water outlet end of the evaporator are controlled in a linkage manner through the controller.
Further, the high-temperature cooling tower and the conventional cooling tower adopt variable-frequency cooling fans; the cooling water pump is a variable-frequency cooling water pump or a multi-pump combination.
The utility model has the beneficial effects that: can be according to the regulation cooling water electric three-way valve flow and the flow direction of the high low selectivity of outdoor environment wet bulb temperature, can guarantee that hot water system can not cause soft dirt, high temperature cooling tower filler can not soften, can improve cooling water temperature low-time operation process again and reduce cooling water flow, sparingly cool off the power consumption, can also save electricity refrigeration compensation operation power consumption and reduce distribution investment cost in addition.
Drawings
FIG. 1 is a schematic diagram of a first prior art approach;
FIG. 2 is a schematic diagram of a second prior art approach;
FIG. 3 is a schematic structural view of embodiment 1 of the present invention;
FIG. 4 is a schematic view showing a parallel type structure of two cooling towers according to embodiment 2 of the present invention.
Fig. 5 is a schematic structural view of a two cooling tower tandem type according to embodiment 3 of the present invention.
Description of the figures:
1. a generator; 2. a condenser; 3. an absorber; 4. an evaporator; 5. a water-water heat exchanger; 6. the electric three-way valve of the cooling water; 7. a high temperature cooling tower; 8. a conventional cooling tower; 9. a first-stage cooling water pump; 10. a secondary cooling water pump; 11. a first shut-off valve; 12. a second shutoff valve; 13. and a third shutoff valve.
Detailed Description
The utility model will be described in further detail below with reference to the drawings and specific examples.
Example 1
As shown in fig. 3: a high-temperature hot water grading self-cooling circulation system comprises a lithium bromide absorption type unit, a water-water heat exchanger 5, a high-temperature cooling tower 7 and a conventional cooling tower 8; the lithium bromide absorption type unit comprises a generator 1, a condenser 2, an absorber 3 and an evaporator 4; the condenser 2 is communicated with the absorber 3, and the generator 1 is communicated with the evaporator 4. Wherein, the water inlet of the generator 1 is connected with the hot water inlet pipeline, and the hot water outlet end of the generator 1 is connected with the hot water inlet of the water-water heat exchanger 5; the cooling water inlet of the water-water heat exchanger 5 and the cooling water inlet of the lithium bromide absorption type unit are respectively connected with the C end and the B end of the outlet of the cooling water electric three-way valve 6, and the A end of the inlet of the cooling water electric three-way valve 6 is connected with a first-stage cooling water pump. A cooling water outlet of the water-water heat exchanger 5 is connected with a high-temperature cooling tower; and a cooling water outlet of the condenser of the lithium bromide absorption type unit is connected with a conventional cooling tower.
The scheme has the following advantages: in the embodiment, a cooling water electric three-way valve and a high-temperature cooling tower are added on the basis of fig. 2, when the temperature of the outdoor environment wet bulb is higher, the high-temperature cooling tower cannot reduce the temperature of hot water to a required temperature, and at the moment, high-temperature cooling water from a water-water heat exchanger enters the high-temperature cooling tower to be cooled; cooling water of the lithium bromide absorption type unit enters a conventional cooling tower to be cooled; when the temperature of the outdoor environment wet bulb is low and direct cooling of the high-temperature cooling tower can be achieved, the lithium bromide absorption type unit is shut down, the cooling water is controlled by the cooling water electric three-way valve to not enter the lithium bromide absorption type unit, and hot water is introduced into the high-temperature cooling tower for cooling in a high-temperature cooling water mode after exchanging heat with the cooling water through the water-water heat exchanger 5. Thus, on the one hand, compared with fig. 1, the hot water system can be prevented from scaling, because the hot water does not directly enter the high-temperature cooling tower but enters the lithium bromide absorption type unit; on the other hand, the problem that the cooling water pump of the system is not energy-saving in the running process in winter can be solved.
In this embodiment, the water outlet of the evaporator 4 of the lithium bromide absorption unit is connected to a hot water outlet pipeline. That is, hot water enters from the generator, drives the unit to operate as a heat source of the generator 1, exchanges heat in the water-water heat exchanger 5, enters the evaporator 4 to be further cooled, and is output from the evaporator.
In this embodiment, the water outlet of the high-temperature cooling tower 7 and the water outlet of the conventional cooling tower 8 are connected to the primary cooling water pump 9 through a pipeline, the water outlet end of the primary cooling water pump 9 is divided into two branches by the cooling water electric three-way valve as described above, and one branch is connected to the cooling water inlet of the absorber 3; the other branch is connected with a cooling water inlet of the water-water heat exchanger 5. On the one hand, only one primary cooling water pump 9 is needed in the embodiment, and compared with fig. 1, the power consumption can be reduced; on the other hand, by arranging the conventional cooling tower, cooling water circulation can be provided for the lithium bromide absorption type unit, and the cooling water circulation can be selectively provided for the water-water heat exchanger according to the requirement; through setting up the high temperature cooling tower, can provide cooling water circulation for water heat exchanger according to the demand selectivity.
In this embodiment, the first-stage cooling water pump 9 is preferably a variable-frequency cooling water pump or a multi-pump combination mode, and the high-temperature cooling tower 7 and the conventional cooling tower 8 are preferably variable-frequency cooling fans, so that power consumption can be reduced by variable-frequency control according to the temperature of cooling water.
In this embodiment, the outlet end of evaporimeter 4 is equipped with temperature sensor, and the temperature of the control of the electronic three-way valve 6 of cooling water and the evaporimeter outlet end passes through controller coordinated control, for example: when the water temperature at the water outlet of the evaporator is detected to be too high, the opening degree of the valve of the cooling water electric three-way valve is controlled, more cooling water enters the lithium bromide absorption type unit through the primary cooling water pump 9, and a small amount of cooling water enters the water-water heat exchanger 5 through the primary cooling water pump, so that the temperature of the hot water outlet of the evaporator is reduced.
The working principle of the embodiment is as follows:
when the outdoor environment wet bulb temperature is higher, the high-temperature cooling tower 7 cannot reduce the temperature of hot water to the required temperature, and the cooling water electric three-way valve 6 controls the water flow entering the water-water heat exchanger 5 and the lithium bromide absorption type unit. The A, B, C end of the cooling water electric three-way valve 6 is communicated, and the water-water heat exchanger 5 and the high-temperature cooling tower 7 carry out cooling water circulation; the lithium bromide absorption unit is circulated with cooling water in a conventional cooling tower 8. Cooling water in a conventional cooling tower 8 and a high-temperature cooling tower 7 respectively enters a water-water heat exchanger 5 and an absorber 3, hot water at the temperature of 60-80 ℃ enters a generator 1 of a lithium bromide absorption type unit to drive the unit to operate, the hot water enters the water-water heat exchanger 5 after being cooled, is cooled by the cooling water, finally enters an evaporator 4 of the lithium bromide absorption type unit and is cooled to 20-30 ℃, and then is output from the evaporator 4.
When the temperature of the outdoor environment wet bulb can be directly reduced, the lithium bromide absorption type unit is shut down, the C, A end of the cooling water electric three-way valve 6 is communicated, the B, A end is disconnected, cooling water circulation is carried out between the water-water heat exchanger 5 and the high-temperature cooling tower 7, and as the lithium bromide absorption type unit is shut down and cooling water circulation is carried out between the lithium bromide absorption type unit and the conventional cooling tower 8, the conventional cooling tower 8 does not need to be started, so that the power consumption is greatly saved; at the moment, hot water enters the water-water heat exchanger 5 along the heat exchange tube of the generator 1, exchanges heat with cooling water input by the high-temperature cooling tower, is cooled to 20-30 ℃, and is output along the heat exchange tube of the evaporator.
To sum up, this embodiment can be according to the different valves of the high low selectivity of outdoor environment wet bulb temperature opening the electric three-way valve of cooling water, can guarantee that the high temperature cooling tower can not cause the knot soft dirt, can improve the energy-conserving effect of low temperature operation in-process cooling water pump again, moreover can greatly reduced power consumption, reduction distribution investment cost.
Example 2
As shown in fig. 4: the difference from embodiment 1 is that the high temperature cooling tower 7 and the conventional cooling tower 8 are connected in parallel. Namely, a pipeline is additionally arranged between the cooling water outlet of the water-water heat exchanger 5 and the water inlet of the high-temperature cooling tower 7, a first shut-off valve 11 is arranged on the pipeline, a pipeline is also additionally arranged between the cooling water outlet of the water-water heat exchanger 5 and the cooling water outlet of the condenser, and a second shut-off valve 12 is arranged on the pipeline, so that the cooling water outlet of the water-water heat exchanger 5 is connected with the cooling water outlet of the condenser through the second shut-off valve 12 and then is connected with the water inlet of the conventional cooling tower 8 through the cooling water outlet of the condenser. In normal operation, when the second shutoff valve 12 is closed and the first shutoff valve 11 is opened, the operation is performed according to the flow of fig. 3; when the first shut-off valve 11 is closed and the second shut-off valve 12 is opened, the operation is performed according to the flow of fig. 2.
Example 3
As shown in fig. 5: the difference from embodiment 1 is that the high temperature cooling tower 7 and the conventional cooling tower 8 are connected in series. Namely, a second-stage cooling water pump 10 is arranged between the water outlet of the high-temperature cooling tower 7 and the water inlet of the conventional cooling tower 8, and a third shut-off valve 13 is arranged between the water outlet of the high-temperature cooling tower 7 and the first-stage cooling water pump 9. When the system operates, high-temperature cooling water output from the water-water heat exchanger 5 firstly enters the high-temperature cooling tower 7 for cooling, and then enters the conventional cooling tower through the secondary cooling water pump 10 for secondary cooling. The third shut-off valve 13 is opened under the condition that the effect can be achieved by independently using the high-temperature cooling tower 7 for cooling, and the secondary cooling water pump 10 and the conventional cooling tower 8 are closed at the moment, so that the purpose of saving running power consumption is achieved.
Claims (10)
1. A high-temperature hot water grading self-cooling circulation system is characterized by comprising a lithium bromide absorption type unit, a water-water heat exchanger, a primary cooling water pump, a high-temperature cooling tower and a conventional cooling tower; the lithium bromide absorption type unit comprises a generator, a condenser, an absorber and an evaporator; the water inlet of the generator is connected with a hot water inlet pipeline, the hot water outlet end of the generator is connected with the hot water inlet of the water-water heat exchanger, and the hot water outlet of the water-water heat exchanger is connected with the water inlet of the evaporator; the cooling water inlet of the water-water heat exchanger and the lithium bromide absorption type unit is connected with the cooling water electric three-way valve and the one-level cooling water pump, and the inlet of the one-level cooling water pump is connected with the high-temperature cooling tower and the conventional cooling tower respectively.
2. The graded self-cooling circulation system for high-temperature hot water according to claim 1, wherein the water outlet of the evaporator is connected with a hot water outlet pipeline.
3. The graded self-cooling circulation system for high-temperature hot water according to claim 1 or 2, wherein the water outlets of the conventional cooling tower and the high-temperature cooling tower are divided into two branches by a primary cooling water pump, and one branch is connected with a cooling water inlet of an absorber of a lithium bromide absorption unit; the other branch is connected with a cooling water inlet of the water-water heat exchanger.
4. The graded self-cooling circulation system for high-temperature hot water as claimed in claim 1 or 2, wherein the cooling water outlet of the water-water heat exchanger is connected with a high-temperature cooling tower; and a cooling water outlet of the lithium bromide absorption type unit condenser is connected with a conventional cooling tower.
5. The high-temperature hot water staged self-cooling circulation system according to claim 1 or 2, wherein the high-temperature cooling tower and the conventional cooling tower are connected in parallel or in series.
6. The graded self-cooling circulation system for high-temperature hot water according to claim 5, wherein the parallel connection mode of the high-temperature cooling tower and the conventional cooling tower is as follows: a pipeline is additionally arranged between a cooling water outlet of the water-water heat exchanger and a water inlet of the high-temperature cooling tower, a first shut-off valve is arranged on the pipeline, a pipeline is also additionally arranged between the cooling water outlet of the water-water heat exchanger and a cooling water outlet of the condenser, and a second shut-off valve is arranged on the pipeline.
7. The staged self-cooling circulation system for high temperature hot water as claimed in claim 5, wherein the series connection mode of the high temperature cooling tower and the conventional cooling tower is as follows: a second-stage cooling water pump is arranged between the water outlet of the high-temperature cooling tower and the water inlet of the conventional cooling tower, and a third shut-off valve is arranged between the water outlet of the high-temperature cooling tower and the first-stage cooling water pump.
8. The graded self-cooling circulation system for high-temperature hot water as claimed in claim 1 or 2, wherein the outlet end of the evaporator is provided with a temperature sensor.
9. The graded self-cooling circulation system for high-temperature hot water as claimed in claim 8, wherein the control of the electric three-way valve of the cooling water and the temperature of the water outlet end of the evaporator are controlled by the controller in a linkage way.
10. The graded self-cooling circulation system for high-temperature hot water according to claim 1 or 2, wherein the high-temperature cooling tower and the conventional cooling tower adopt variable frequency cooling fans; the cooling water pump is a variable-frequency cooling water pump or a multi-pump combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121409687.6U CN217031659U (en) | 2021-06-24 | 2021-06-24 | High-temperature hot water grading self-cooling circulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121409687.6U CN217031659U (en) | 2021-06-24 | 2021-06-24 | High-temperature hot water grading self-cooling circulation system |
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| Publication Number | Publication Date |
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| CN217031659U true CN217031659U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121409687.6U Active CN217031659U (en) | 2021-06-24 | 2021-06-24 | High-temperature hot water grading self-cooling circulation system |
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| CN (1) | CN217031659U (en) |
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2021
- 2021-06-24 CN CN202121409687.6U patent/CN217031659U/en active Active
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