Low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system

Abstract

The utility model discloses an energy-saving and water-saving system for cooling a circulating water device by low-temperature waste heat refrigeration, which comprises main components such as a cooling tower, a surface air cooler, a spraying system, a coil heat exchanger, a lithium bromide refrigerator and the like, and recycling of low-temperature waste heat and energy-saving and water-saving of cooling circulating water are realized by integrating the components. Specifically, according to the system, low-temperature waste heat generated in the production process is converted into low-temperature chilled water through a lithium bromide refrigerating machine, the chilled water exchanges heat with air entering a cooling tower through a coil pipe type heat exchanger, the air temperature is reduced, the temperature difference between cooling circulating water and the air is increased, and the cooling efficiency is improved. And meanwhile, the surface air cooler at the top of the cooling tower condenses and captures evaporated cooling circulating water by using chilled water, so that the loss of cooling water is reduced. According to the method, the production efficiency is improved, the operation cost is reduced, a new thought is provided for recycling of low-temperature waste heat, and the method has wide application prospects and popularization value.

Description

TECHNICAL FIELD

[0001] The utility model relates to cooling tower cooling circulating water system technical field, specifically related to a kind of low-temperature waste heat refrigeration type cooling circulating water energy-saving water-saving system. BACKGROUND

[0002] In process industry, cooling tower is widely used as important heat exchange equipment to reduce the temperature of circulating water. In summer, cooling tower realizes heat exchange by using evaporation heat exchange to take away heat through the contact of water and air. Limited by ambient wet bulb temperature, the temperature difference between inlet and outlet water of cooling tower is small, which cannot reach ideal edge temperature, and may cause DCS unit alarm, affect production safety and economic benefits. Therefore, reducing the ambient wet bulb temperature and increasing the temperature difference between air and cooling circulating water can effectively improve cooling efficiency and reduce the power consumption of cooling circulating water pump. At the same time, a large amount of low-temperature waste heat cannot be utilized in process industry production, and there is a lack of available heat sink, so a large amount of low-temperature waste heat is wasted. A large amount of cooling circulating water is evaporated into the atmosphere during the operation of cooling tower, causing waste of circulating water.

[0003] Therefore, aiming at the above problems, we propose an energy-saving and water-saving method and system of low-temperature waste heat refrigeration for cooling circulating water device. CONTENT OF UTILITY MODEL

[0004] Therefore, the utility model provides a kind of low-temperature waste heat refrigeration type cooling circulating water energy-saving water-saving system to solve the above problems in the prior art. The purpose is to reduce the ambient temperature, collect and utilize low-temperature waste heat, and reduce the evaporation loss of cooling circulating water. To achieve the above purpose, the utility model provides the following technical scheme: according to the first aspect of the utility model, a kind of low-temperature waste heat refrigeration type cooling circulating water energy-saving water-saving system,

[0005] The system includes cooling tower, surface cooler, spraying system, cooling filler, coil type heat exchanger and water collecting pool stacked from top to bottom in sequence;

[0006] The water collecting pool is connected to the cooling pool through a pipeline on the side;

[0007] The cooling pool is connected to the spraying system through a pipeline with a cooling circulating water pump and a heat exchanger connected in series;

[0008] The coil type heat exchanger is connected to the surface cooler and the lithium bromide refrigerator through a pipeline to form a loop.

[0009] Further, the pipeline between the surface cooler and the lithium bromide refrigerator is a chilled water outlet pipeline.

[0010] Further, the pipeline between the heat exchanger and the spraying system is a cooling circulating water inlet pipeline.

[0011] Further, the pipeline between the coil heat exchanger and the lithium bromide refrigerator is a chilled water inlet pipeline.

[0012] Further, the pipeline between the water collecting pool and the cooling water pool is a cooling circulating water return pipeline.

[0013] Further, the input end of the lithium bromide refrigerator is a waste heat inlet.

[0014] Further, the output end of the lithium bromide refrigerator is a waste heat outlet.

[0015] Further, the cooling tower is a trapezoidal structure with gradually increasing cross section from top to bottom.

[0016] Further, the spray nozzles of the spray system are arranged towards the cooling filler.

[0017] The utility model has the following advantages:

[0018] 1. The lithium bromide refrigerator and the coil heat exchanger are added to reduce the air temperature entering the cooling tower, increase the temperature difference between the cooling circulating water and the air, reduce the cooling circulating water flow when the temperature difference increases, reduce the power consumption of the cooling circulating water pump, have obvious energy-saving effect, the power saving rate is more than 20%, and the possibility of DCS unit alarm caused by not reaching the card edge temperature is reduced, and the safety of the system is improved.

[0019] 2. The surface cooler is added at the top of the cooling tower, the chilled water of the lithium bromide refrigerator is used to cool and condense the evaporated cooling circulating water, the cooling circulating water is circulated back to the water collecting pool, the cooling circulating water loss is reduced, and the system operation cost is reduced.

[0020] 3. The low-temperature waste heat refrigeration method is used to recycle a large amount of low-temperature waste heat, improve the cooling effect of the cooling tower, recycle the waste heat resources lacking available heat sinks in the production process, improve the production efficiency, reduce the cooling cost, and provide a new recycling idea for similar waste heat resources in other industries.

[0021] 4. The lithium bromide refrigerator, the coil heat exchanger, the surface cooler and other main equipment involved in the scheme are mature standardized products on the market, simple to produce and assemble, controllable cost, and good popularization significance. DRAWINGS

[0022] Figure 1 A development structure diagram of a low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system is provided for some embodiments of the utility model.

[0023] In the figure, 1, cooling tower; 2, surface cooler; 3, spraying system; 4, cooling filler; 5, coil heat exchanger; 6, cooling circulating water return pipeline; 7, cooling water pool; 8, water collecting pool; 9, cooling circulating water pump; 10, waste heat inlet; 11, waste heat outlet; 12, chilled water inlet pipeline; 13, chilled water outlet pipeline; 14, cooling circulating water inlet pipeline; 15, lithium bromide refrigerator; 16, heat exchanger. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail by the specific embodiments, and the person skilled in the art can easily understand other advantages and effects of the present application from the disclosed content of the specification. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the present application.

[0025] Embodiment 1

[0026] As shown in the figure, the low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system in the first aspect of the present application, Figure 1

[0027] The system comprises, from top to bottom, a cooling tower 1, a surface cooler 2, a spraying system 3, a cooling filler 4, a coil heat exchanger 5, and a water collecting pool 8.

[0028] The water collecting pool 8 is connected to the cooling water pool 7 through a pipeline on the side.

[0029] The cooling water pool 7 is connected to the spraying system 3 through a pipeline in which a cooling circulating water pump 9 and a heat exchanger 16 are connected in series.

[0030] The coil heat exchanger 5 is connected to the surface cooler 2 and the lithium bromide refrigerator 15 through pipelines to form a loop.

[0031] The above-mentioned embodiments achieve the following technical effects:

[0032] 1. The present application increases the lithium bromide refrigerator and the coil heat exchanger, reduces the air temperature entering the cooling tower, increases the temperature difference with the cooling circulating water, reduces the cooling circulating water flow when the temperature difference increases, reduces the power consumption of the cooling circulating water pump, has obvious energy-saving effect, the power saving rate is more than 20%, at the same time, reduces the possibility of DCS unit alarm caused by not reaching the card edge temperature, and improves the safety of the system.

[0033] ​2、This scheme through the increase of the cooling tower top surface cooler, using lithium bromide refrigerator frozen water to make the cooling circulating water evaporation cooling, flow back to the pool after circulating, reducing the cooling circulating water loss, reduce the system operation cost.

[0034] 3、This scheme through the use of low temperature waste heat refrigeration means, both recycling a large number of low temperature waste heat, improve the cooling effect of cooling tower, the production process of the lack of available heat sink waste heat resource recycling, both improve the production efficiency, reduce the cooling cost, at the same time for other industries in similar waste heat resources provide new recycling ideas.

[0035] 4、This scheme involves lithium bromide refrigerator, coil type heat exchanger, surface cooler and other major equipment are mature standardization products on the market, production and assembly is simple, cost controllable, has good popularization significance.

[0036] Embodiment 2

[0037] As Figure 1 shown, a low temperature waste heat refrigeration type cooling circulating water energy saving and water saving system, including the contents of embodiment 1, in addition to this, the pipeline between the surface cooler 2 and the lithium bromide refrigerator 15 is the chilled water outlet pipeline 13.

[0038] Optionally, the pipeline between the heat exchanger 16 and the spray system 3 is the cooling circulating water inlet pipeline 14.

[0039] Optionally, the pipeline between the coil type heat exchanger 5 and the lithium bromide refrigerator 15 is the chilled water inlet pipeline 12.

[0040] Optionally, the pipeline between the water collecting pool 8 and the cooling water pool 7 is the cooling circulating water return pipeline 6.

[0041] Optionally, the input end of the lithium bromide refrigerator 15 is the waste heat inlet 10.

[0042] Optionally, the output end of the lithium bromide refrigerator 15 is the waste heat outlet 11.

[0043] Embodiment 3

[0044] As Figure 1 shown, a low temperature waste heat refrigeration type cooling circulating water energy saving and water saving system, including the contents of embodiment 2, in addition to this, the cooling tower 1 is a trapezoidal structure with gradually increasing cross section from top to bottom.

[0045] Optionally, the spray nozzle of the spray system 3 is arranged towards the cooling filler 4.

[0046] As Figure 1 shown, a low temperature waste heat refrigeration type cooling circulating water energy saving and water saving system, including the contents of embodiment 2, in addition to this, the cooling tower 1 is a trapezoidal structure with gradually increasing cross section from top to bottom.

[0047] Firstly, a large amount of low-temperature waste heat generated in the process industry is sent to the lithium bromide refrigerator 15 through the waste heat inlet 10, and the low-temperature waste heat transfers heat to the lithium bromide aqueous solution in the lithium bromide refrigerator 15, and the lithium bromide aqueous solution exchanges heat with chilled water through evaporation and condensation processes to achieve the purpose of cooling and refrigeration.

[0048] Then, the chilled water after cooling is sent to the coil heat exchanger 5 through the chilled water inlet pipe 12, and the air temperature is lowered through air heat exchange to increase the temperature difference between the cooling circulating water sprayed by the spraying system 3 and the air entering the cooling tower 1, and the cooling circulating water sprayed by the spraying system 3 is collected in the water collecting pool 8 and then continues to circulate by entering the cooling water pool 7.

[0049] Finally, the coil heat exchanger 5 sends the chilled water to the surface cooler 2 at the top of the cooling tower, so that the evaporated cooling circulating water is cooled and condensed to enter the water collecting pool 8, and the chilled water is sent back to the lithium bromide refrigerator 15 through the chilled water outlet pipe 13 to continue to circulate. The waste heat is sent out of the lithium bromide refrigerator 15 through the waste heat outlet 11.

[0050] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific feature, structure, material or characteristic described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the features of different embodiments or examples described in the specification and the features of different embodiments or examples within the scope of the utility model without contradiction.

[0054] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model. The person skilled in the art can change, modify, replace and transform the above embodiments within the scope of the utility model.

[0055] In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific feature, structure, material or characteristic described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the features of different embodiments or examples described in the specification and the features of different embodiments or examples within the scope of the utility model without contradiction.

[0056] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system, characterized in that, The system includes a cooling tower (1), a surface cooler (2), a spray system (3), cooling packing (4), a coil heat exchanger (5), and a water collection tank (8) stacked from top to bottom; The cooling water pool (7) is connected to the side of the water collection pool (8) by a pipe; The cooling water tank (7) is connected to the spray system (3) through a pipe connected in series with a cooling circulating water pump (9) and a heat exchanger (16); The coil heat exchanger (5) is connected to the surface cooler (2) and the lithium bromide refrigerator (15) through pipes to form a loop.

2. The low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The pipe between the surface cooler (2) and the lithium bromide chiller (15) is the chilled water outlet pipe (13).

3. The low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The pipe between the heat exchanger (16) and the spray system (3) is the cooling circulating water inlet pipe (14).

4. The low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The pipe between the coil heat exchanger (5) and the lithium bromide chiller (15) is the chilled water inlet pipe (12).

5. The low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The pipe between the water collection tank (8) and the cooling water tank (7) is the cooling circulating water return pipe (6).

6. The low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The input end of the lithium bromide chiller (15) is the waste heat inlet (10).

7. The low-temperature waste heat refrigeration cooling circulating water energy-saving and water-saving system according to claim 6, characterized in that, The output end of the lithium bromide chiller (15) is the waste heat outlet (11).

8. The low-temperature waste heat refrigeration cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The cooling tower (1) is a trapezoidal structure with a cross-section that gradually increases from top to bottom.

9. The low-temperature waste heat refrigeration type cooling circulating water energy-saving and water-saving system according to claim 1, characterized in that, The nozzles of the spray system (3) are positioned facing the cooling filler (4).

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