Lithium bromide unit

Abstract

The utility model relates to the technical field of air conditioning equipment, in particular to a lithium bromide unit which comprises a high-pressure evaporator, a high-pressure absorber, a low-pressure evaporator, a low-pressure absorber, a first generator, a first condenser, a second generator and a second condenser. The high-pressure evaporator, the first generator, the second generator and the low-pressure absorber are sequentially communicated, cooling waste heat water generated after the waste heat water is cooled through the high-pressure evaporator sequentially enters the first generator and the second generator and then is discharged, and the waste heat water enters the high-pressure absorber through high-temperature refrigerant steam generated by the high-pressure evaporator. An absorbent solution generated by the high-pressure absorber sequentially enters the first generator, the second generator and the low-pressure absorber, and the low-pressure absorber is reversely communicated with the high-pressure absorber; the first condenser and the second condenser are both communicated with the low-pressure evaporator, and the low-pressure evaporator is reversely communicated with the high-pressure evaporator. The unit not only meets the cooling requirement of process waste heat water, but also can meet the requirement of customers for using cold and high-temperature heat at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, in particular to a lithium bromide unit. Background Art

[0002] In the fields of petrochemicals, chemicals, pharmaceuticals, printing and dyeing, steel coking, non-ferrous metals, etc., high-temperature heat (water, exhaust steam, materials) of about 90-130℃ generated from the process is a common waste heat energy in the production process. The waste heat energy produced in the process is used in various applications according to actual needs. For example, it can be directly cooled by a cooling tower or cooled by a lithium bromide refrigeration unit to produce chilled water. Lithium bromide heating heat pumps can also be used to produce higher hot water or steam. These technologies are relatively mature.

[0003] However, using a cooling tower to directly cool down the temperature will cause a waste of heat energy and require the consumption of cooling water, which is not economical; the lithium bromide refrigeration unit only has a single cooling function and cannot meet the customer's high-temperature heat needs; and the lithium bromide heating heat pump only has a single heating function and cannot meet the customer's cooling needs.

[0004] Therefore, how to maximize the use of process waste heat to solve the cooling demand of 90-130℃ process waste water in the fields of petrochemical, chemical, pharmaceutical, printing and dyeing, steel coking, non-ferrous metals, etc., and meet the customer's demand for both cold and high-temperature heat (hot water or steam) at the same time, is a technical problem that technicians in this field urgently need to solve.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a lithium bromide unit, which not only solves the demand for cooling process waste water, but also meets the customer's demand for both cold and high-temperature heat (hot water or steam).

[0007] The utility model provides a lithium bromide unit, comprising a high-pressure evaporator, a high-pressure absorber, a low-pressure evaporator, a low-pressure absorber, a first generator, a first condenser, a second generator and a second condenser;

[0008] The high-pressure evaporator, the first generator, the second generator and the low-pressure absorber are connected in sequence. The waste hot water generated by cooling the waste hot water by the high-pressure evaporator enters the first generator and the second generator in sequence and is then discharged. The waste hot water passes through the high-pressure evaporator to generate high-temperature refrigerant steam and enters the high-pressure absorber. The absorbent solution generated by the high-pressure absorber enters the first generator, the second generator and the low-pressure absorber in sequence. The low-pressure absorber is connected to the high-pressure absorber in reverse.

[0009] The first condenser and the second condenser are both communicated with the low-pressure evaporator, and the low-pressure evaporator is communicated with the high-pressure evaporator in reverse direction.

[0010] As a preferred embodiment of the present technical solution, it further includes a first solution heat exchanger and a second solution heat exchanger.

[0011] The first solution heat exchanger is disposed between the high-pressure absorber and the first generator, and the absorbent solution generated by the high-pressure absorber enters the first generator through the first solution heat exchanger;

[0012] The second solution heat exchanger is disposed between the second generator and the low-pressure absorber, and the absorbent concentrated solution generated by the second generator enters the low-pressure absorber through the second solution heat exchanger.

[0013] As a preferred embodiment of this technical solution, it also includes a dilute solution pump and a refrigerant circulation pump.

[0014] The dilute solution pump is arranged between the low-pressure absorber and the high-pressure absorber;

[0015] The refrigerant circulation pump is arranged between the low-pressure evaporator and the high-pressure evaporator.

[0016] As a preferred embodiment of the present technical solution, a spray pump is further included, and the spray pump is arranged between the second solution heat exchanger and the low-pressure absorber.

[0017] As a preferred embodiment of the present technical solution, spray pipes are provided above the high-pressure absorber, the high-pressure evaporator, the first generator, the second generator, the low-pressure absorber and the low-pressure evaporator.

[0018] As a preferred embodiment of the present technical solution, the high-pressure absorber is respectively provided with a water supply inlet and a steam outlet.

[0019] As a preferred embodiment of the present technical solution, the high-pressure evaporator and the high-pressure absorber are arranged in the same cylinder, and a partition is provided between the high-pressure evaporator and the high-pressure absorber.

[0020] As a preferred embodiment of the present technical solution, the first generator and the first condenser are arranged in the same cylinder, and a partition is provided between the first generator and the first condenser.

[0021] As a preferred embodiment of the present technical solution, the second generator and the second condenser are arranged in the same cylinder, and a partition is provided between the second generator and the second condenser.

[0022] As a preferred embodiment of the present technical solution, the low-pressure absorber and the low-pressure evaporator are arranged in the same cylinder, and a partition is provided between the low-pressure absorber and the low-pressure evaporator.

[0023] The lithium bromide unit of the present utility model has at least the following beneficial effects:

[0024] The lithium bromide unit of the present invention includes a high-pressure evaporator, a high-pressure absorber, a low-pressure evaporator, a low-pressure absorber, a first generator, a first condenser, a second generator and a second condenser, wherein the high-pressure evaporator, the high-pressure absorber and the first generator, the second generator, the first condenser and the second condenser together constitute a heating cycle, and the low-pressure evaporator, the low-pressure absorber and the first generator, the second generator, the first condenser and the second condenser together constitute a refrigeration cycle.

[0025] Specifically, the waste hot water enters the high-pressure evaporator, and after being processed by the high-pressure evaporator, cooled waste hot water and high-temperature refrigerant steam are obtained, among which the cooled waste hot water enters the first generator and the second generator in turn, and is finally cooled to 80°C and discharged; the high-temperature refrigerant steam enters the high-pressure absorber, and the absorbent in the high-pressure absorber absorbs the heat of the high-temperature refrigerant steam. The high-temperature heat released can heat the replenishment water to produce steam above 0.2MPa or hot water above 120°C, and the absorbent solution generated after the absorbent in the high-heat absorber absorbs the high-temperature refrigerant steam further enters the first generator and the second generator for treatment and becomes concentrated. The concentrated absorbent solution is transported to the low-pressure absorber. In the low-pressure absorber, the concentrated absorbent solution absorbs the refrigerant steam from the low-pressure evaporator, and the solution becomes dilute. The diluted absorbent solution is again input into the high-pressure absorber to complete the solution cycle.

[0026] The high-temperature refrigerant vapor generated by the heated absorbent dilute solution in the first generator and the second generator enters the first condenser and the second condenser respectively. The condensation heat generated in the first condenser and the second condenser is taken away by the cooling water in the tube. The refrigerant water generated by the first condenser and the second condenser enters the low-pressure evaporator after throttling and pressure reduction. The refrigerant in the low-pressure evaporator absorbs the heat of the cold water in the tube and evaporates to produce chilled water at 5-7°C. In addition, the refrigerant in the low-pressure evaporator will be further transported to the high-pressure evaporator. The refrigerant water in the high-pressure evaporator absorbs the heat of the waste hot water in the tube to produce high-temperature refrigerant vapor. At the same time, the temperature of the waste hot water is reduced to complete the refrigerant cycle.

[0027] The absorption heat in the low-pressure absorber and the condensation heat in the first condenser and the second condenser are taken away by the cooling water in the tube.

[0028] Therefore, the lithium bromide unit of the present invention not only solves the demand for cooling process waste water, but also meets the customer's demand for both cold and high-temperature heat (hot water or steam), and can achieve dual use of one machine with low equipment investment and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of the lithium bromide unit of the utility model.

[0031] Description of reference numerals:

[0032] 1: High-pressure evaporator; 2: High-pressure absorber; 3: Low-pressure evaporator; 4: Low-pressure absorber; 5: First generator; 6: First condenser; 7: Second generator; 8: Second condenser; 9: First solution heat exchanger; 10: Second solution heat exchanger; 11: Dilute solution pump; 12: Refrigerant circulation pump; 13: Spray pump; 14: Spray pipe. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solution of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only 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" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0036] Example

[0037] The utility model provides a lithium bromide unit, comprising a high-pressure evaporator 1, a high-pressure absorber 2, a low-pressure evaporator 3, a low-pressure absorber 4, a first generator 5, a first condenser 6, a second generator 7 and a second condenser 8; wherein the high-pressure evaporator 1, the first generator 5, the second generator 7 and the low-pressure absorber 4 are connected in sequence, waste hot water enters the high-pressure evaporator 1, and after being processed by the high-pressure evaporator 1, cooled waste hot water and high-temperature refrigerant steam are obtained, wherein the cooled waste hot water enters the first generator 5 and the second generator 7 in sequence, and is finally cooled to 80°C and discharged; the high-temperature refrigerant steam enters the high-pressure absorber 2, and the absorbent in the high-pressure absorber 2 absorbs the heat of the high-temperature refrigerant steam, and the high-temperature heat released can be used to heat make-up water to generate steam above 0.2MPa or hot water above 120°C, and the absorbent solution generated by the absorbent in the high-heat absorber after absorbing the high-temperature refrigerant steam further enters the first generator 5 and the second generator 7 for treatment and becomes concentrated, and the concentrated absorbent solution is transported to the low-pressure absorber 4;

[0038] In the lithium bromide unit of this embodiment, the low-pressure absorber 4 is reversely connected to the high-pressure absorber 2. In the low-pressure absorber 4, the concentrated absorbent solution absorbs the refrigerant vapor from the low-pressure evaporator 3, and the solution becomes dilute. The diluted absorbent solution is then input into the high-pressure absorber 2 again to complete the solution circulation.

[0039] The first condenser 6 and the second condenser 8 are both connected to the low-pressure evaporator 3 , and the low-pressure evaporator 3 is connected to the high-pressure evaporator 1 in reverse.

[0040] The high-temperature refrigerant vapor generated by the heated absorbent dilute solution in the first generator 5 and the second generator 7 enters the first condenser 6 and the second condenser 8 respectively. The condensation heat generated in the first condenser 6 and the second condenser 8 is taken away by the cooling water in the tube. The refrigerant water generated by the first condenser 6 and the second condenser 8 enters the low-pressure evaporator 3 after throttling and pressure reduction. The refrigerant in the low-pressure evaporator 3 absorbs the heat of the cold water in the tube and evaporates to produce chilled water at 5-7°C. In addition, the refrigerant in the low-pressure evaporator 3 will be further transported to the high-pressure evaporator 1. The refrigerant water in the high-pressure evaporator 1 absorbs the heat of the waste hot water in the tube to produce high-temperature refrigerant vapor. At the same time, the temperature of the waste hot water is reduced to complete the refrigerant cycle.

[0041] The absorption heat in the low-pressure absorber and the condensation heat in the first condenser and the second condenser are taken away by the cooling water in the tube.

[0042] On the basis of the above technical solution, it is further preferred that the lithium bromide unit of this example further includes a first solution heat exchanger 9 and a second solution heat exchanger 10, wherein the first solution heat exchanger 9 is arranged between the high-pressure absorber 2 and the first generator 5, and the absorbent solution generated by the high-pressure absorber 2 is heat exchanged in the first solution heat exchanger 9 before entering the first generator 5;

[0043] The second solution heat exchanger 10 is provided between the second generator 7 and the low-pressure absorber 4 . The absorbent concentrated solution generated by the second generator 7 is heat exchanged in the second solution heat exchanger 10 before entering the low-pressure absorber 4 .

[0044] The lithium bromide unit in this embodiment also includes a dilute solution pump 11 and a refrigerant circulation pump 12, wherein the solution pump is arranged between the low-pressure absorber 4 and the high-pressure absorber 2, and is mainly used to transport the relatively dilute absorbent solution in the low-pressure absorber 4 to the high-pressure absorber 2 to complete the circulation of the absorbent solution.

[0045] Specifically, when the relatively dilute absorbent solution is transported to the high-pressure absorber 2, the relatively dilute absorbent solution passes through the second solution heat exchanger 10 and the first solution heat exchanger 9 in sequence for heat exchange, fully utilizing the heat in the system before being transported to the high-pressure absorber 2.

[0046] The refrigerant circulation pump 12 is provided between the low-pressure evaporator 3 and the high-pressure evaporator 1 and is mainly used to transport the refrigerant in the low-pressure evaporator 3 to the high-pressure evaporator 1 to complete the refrigerant circulation.

[0047] On the basis of the above technical solution, it is further preferred that a spray pump 13 is further provided between the second solution heat exchanger 10 and the low-pressure absorber 4 , mainly used to transport the concentrated absorbent solution after heat exchange in the second solution heat exchanger 10 to the low-pressure absorber 4 .

[0048] On the basis of the above technical solution, more preferably, a spray pipe 14 is provided above the high-pressure absorber 2 , the high-pressure evaporator 1 , the first generator 5 , the second generator 7 , the low-pressure absorber 4 and the low-pressure evaporator 3 .

[0049] The dilute solution pump 11 is connected to the spray pipe 14 above the high-pressure absorber 2 through a connecting pipe, and the diluted absorbent solution in the low-pressure absorber 4 is sprayed into the high-pressure absorber 2 again, thereby increasing the contact area between the absorbent solution and the high-pressure absorber 2 and the steam.

[0050] Similarly, the refrigerant circulation pump 12 is connected to the spray pipe 14 above the high-pressure evaporator 1 through a connecting pipe, and the refrigerant in the low-pressure evaporator 3 is sprayed into the high-pressure evaporator 1 again;

[0051] Spray pipes 14 are also provided above the first generator 5 and the second generator 7, respectively, so that the absorbent solution after heat exchange in the first solution heat exchanger 9 is sprayed to the first generator 5 and the second generator 7 in sequence;

[0052] Spray pipes 14 are also provided above the low-pressure absorber 4 and the low-pressure evaporator 3, respectively. The absorbent solution after heat exchange in the second solution heat exchanger 10 is sprayed into the low-pressure absorber 4 through the spray pipe 14 under the action of the spray pump 13; the refrigerant water in the low-pressure evaporator 3 is transported and sprayed into the low-pressure evaporator 3 and the high-pressure evaporator 1 respectively through the refrigerant circulation pump 12.

[0053] On the basis of the above technical solution, it is further preferred that a water supply inlet and a steam outlet are respectively provided on the high-pressure absorber 2, so that the high-temperature heat released by the high-pressure absorber 2 when absorbing the heat of the refrigerant steam can heat the water supply, thereby generating steam above 0.2 MPa or hot water above 120°C.

[0054] In this embodiment, the high-pressure evaporator 1 and the high-pressure absorber 2, the first generator 5 and the first condenser 6, the second generator 7 and the second condenser 8, the low-pressure absorber 4 and the low-pressure evaporator 3 are all arranged in the same cylinder, and a partition is provided between the high-pressure evaporator 1 and the high-pressure absorber 2, a partition is provided between the first generator 5 and the first condenser 6, a partition is provided between the second generator 7 and the second condenser 8, and a partition is provided between the low-pressure absorber 4 and the low-pressure evaporator 3.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium bromide unit, characterized in that: It comprises a high-pressure evaporator (1), a high-pressure absorber (2), a low-pressure evaporator (3), a low-pressure absorber (4), a first generator (5), a first condenser (6), a second generator (7) and a second condenser (8); The high-pressure evaporator (1), the first generator (5), the second generator (7) and the low-pressure absorber (4) are connected in sequence. The waste hot water generated by cooling the waste hot water through the high-pressure evaporator (1) enters the first generator (5) and the second generator (7) in sequence and is then discharged. The waste hot water passes through the high-pressure evaporator (1) to generate high-temperature refrigerant steam and enters the high-pressure absorber (2). The absorbent solution generated by the high-pressure absorber (2) enters the first generator (5), the second generator (7) and the low-pressure absorber (4) in sequence. The low-pressure absorber (4) is connected to the high-pressure absorber (2) in reverse. The first condenser (6) and the second condenser (8) are both connected to the low-pressure evaporator (3), and the low-pressure evaporator (3) is connected to the high-pressure evaporator (1) in reverse.

2. The lithium bromide unit according to claim 1, characterized in that: It also includes a first solution heat exchanger (9) and a second solution heat exchanger (10), The first solution heat exchanger (9) is arranged between the high-pressure absorber (2) and the first generator (5), and the absorbent solution generated by the high-pressure absorber (2) enters the first generator (5) through the first solution heat exchanger (9); The second solution heat exchanger (10) is arranged between the second generator (7) and the low-pressure absorber (4), and the absorbent concentrated solution generated by the second generator (7) enters the low-pressure absorber (4) through the second solution heat exchanger (10).

3. The lithium bromide unit according to claim 1, characterized in that: It also includes a dilute solution pump (11) and a refrigerant circulation pump (12), The dilute solution pump (11) is arranged between the low-pressure absorber (4) and the high-pressure absorber (2); The refrigerant circulation pump (12) is arranged between the low-pressure evaporator (3) and the high-pressure evaporator (1).

4. The lithium bromide unit according to claim 2, characterized in that: It also includes a spray pump (13), which is arranged between the second solution heat exchanger (10) and the low-pressure absorber (4).

5. The lithium bromide unit according to claim 1, characterized in that: Spray pipes (14) are provided above the high-pressure absorber (2), the high-pressure evaporator (1), the first generator (5), the second generator (7), the low-pressure absorber (4) and the low-pressure evaporator (3).

6. The lithium bromide unit according to claim 1, characterized in that: The high-pressure absorber (2) is respectively provided with a water supply inlet and a steam outlet.

7. The lithium bromide unit according to claim 1, characterized in that: The high-pressure evaporator (1) and the high-pressure absorber (2) are arranged in the same cylinder, and a partition is provided between the high-pressure evaporator (1) and the high-pressure absorber (2).

8. The lithium bromide unit according to claim 1, characterized in that: The first generator (5) and the first condenser (6) are arranged in the same cylinder, and a partition is provided between the first generator (5) and the first condenser (6).

9. The lithium bromide unit according to claim 1, characterized in that: The second generator (7) and the second condenser (8) are arranged in the same cylinder, and a partition is provided between the second generator (7) and the second condenser (8).

10. The lithium bromide unit according to claim 1, characterized in that: The low-pressure absorber (4) and the low-pressure evaporator (3) are arranged in the same cylinder, and a partition is provided between the low-pressure absorber (4) and the low-pressure evaporator (3).

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