A low-emission, high-efficiency, direct-fired lithium bromide absorption chiller and hot water unit

Abstract

The present invention relates to a low-emission, high-energy-efficiency, direct-fired lithium bromide absorption type cold and hot water unit, belonging to the technical field of air conditioning equipment. It is additionally provided with a hot water heat exchanger (17); the hot water heat exchanger water inlet pipe (29) of the hot water heat exchanger (17) is connected to the evaporator water inlet pipe (31) of the evaporator (1), and a valve II (30) is provided on the pipe; the hot water heat exchanger water outlet pipe (26) of the hot water heat exchanger (17) is connected to the evaporator water outlet pipe (28) of the evaporator (1), and a valve I (27) is provided on the pipe; the solution flow of the flue gas heat exchanger (14) and the refrigerant water heat exchanger (20) is a series flow. It can reduce the temperature of the dilute solution entering the flue gas heat exchanger when the unit is in heating operation, thereby reducing the exhaust temperature of the unit to below 80°C, so that the heat of the low-temperature flue gas can be fully recovered and utilized, and the heating performance coefficient COP is increased to above 0.962, the unit operation is more economical, and the heating energy consumption is lower.

Description

Technical Field

[0001] The invention relates to a low-emission and high-energy-efficiency direct-fired lithium bromide absorption type cold and hot water unit, belonging to the technical field of air conditioning equipment. Background Art

[0002] A previous direct-fired lithium bromide absorption hot and cold water unit consists of an evaporator, an absorber, a direct-fired high-pressure generator, a low-pressure generator, a condenser, a high-temperature heat exchanger, a low-temperature heat exchanger, a flue gas heat exchanger, a refrigerant water heat exchanger, a solution pump, a refrigerant pump, a control system, and pipes and valves connecting the various components. The cooling water flow of the unit is a series flow; the flue gas heat exchanger is arranged on the exhaust pipe of the direct-fired high-pressure generator, and the refrigerant water heat exchanger is arranged on the high-temperature refrigerant water pipe between the low-pressure generator and the condenser.

[0003] When the unit is in refrigeration operation, part of the low-temperature dilute solution delivered by the solution pump enters the refrigerant water heat exchanger through the refrigerant water heat exchanger inlet pipe, exchanges heat with the high-temperature refrigerant water, and recycles part of the heat of the high-temperature refrigerant water. The dilute solution exiting the refrigerant water heat exchanger enters the flue gas heat exchanger through the flue gas heat exchanger inlet pipe, exchanges heat with the flue gas discharged by the direct-fired high-pressure generator, and can reduce the exhaust gas temperature to about 100°C. The unit has a high refrigeration performance coefficient COP.

[0004] When the unit is in heating operation, the refrigerant water heat exchanger does not work and only serves as a solution circulation channel. At this time, due to the high temperature of the dilute solution in the absorber (about 100°C), the dilute solution transported by the solution pump and entering the flue gas heat exchanger through the flue gas heat exchanger liquid inlet pipe can only reduce the exhaust gas temperature to about 120°C after heat exchange with the flue gas. The heat of the low-temperature flue gas cannot be fully recovered and utilized, and the heating performance coefficient COP is about 0.942. Summary of the invention

[0005] The purpose of the present invention is to solve the problems raised in the above background problems and to provide a low-emission, high-efficiency, direct-fired lithium bromide absorption hot and cold water unit, which can reduce the temperature of the dilute solution entering the flue gas heat exchanger when the unit is in heating operation, thereby reducing the unit exhaust temperature to below 80°C, so that the heat of the low-temperature flue gas can be fully recovered and utilized, and the heating performance coefficient COP is increased to above 0.962, the unit operation is more economical, and the heating energy consumption is lower.

[0006] The object of the present invention is achieved as follows: A low-emission, high-energy-efficiency, direct-fired lithium bromide absorption cold and hot water unit, comprising an evaporator, an absorber, a direct-fired high-pressure generator, a low-pressure generator, a condenser, a high-temperature heat exchanger, a low-temperature heat exchanger, a flue gas heat exchanger, a refrigerant water heat exchanger, a solution pump and a refrigerant pump, and an additional hot water heat exchanger;

[0007] The hot water heat exchanger water inlet pipe of the hot water heat exchanger is connected to the evaporator water inlet pipe of the evaporator, and a valve II is provided on the pipe;

[0008] The hot water heat exchanger outlet pipe of the hot water heat exchanger is connected to the evaporator outlet pipe of the evaporator, and a valve I is provided on the pipe;

[0009] The solution flow of the flue gas heat exchanger and the refrigerant water heat exchanger is a series flow.

[0010] The hot water heat exchanger is arranged on the liquid inlet pipe of the flue gas heat exchanger;

[0011] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a series process.

[0012] The hot water heat exchanger is arranged on the liquid inlet pipe of the flue gas heat exchanger;

[0013] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a parallel process.

[0014] The hot water heat exchanger is arranged on the refrigerant water heat exchanger liquid inlet pipe of the refrigerant water heat exchanger;

[0015] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a series process.

[0016] The hot water heat exchanger is arranged on the refrigerant water heat exchanger liquid inlet pipe of the refrigerant water heat exchanger;

[0017] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a parallel process.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] A low-emission, high-energy-efficiency, direct-fired lithium bromide absorption cold and hot water unit of the present invention is additionally provided with a hot water heat exchanger. When the unit is in heating operation, a portion of the hot water entering the unit through the evaporator water inlet pipe enters the hot water heat exchanger, and performs heat exchange with a dilute solution entering the hot water heat exchanger at a temperature of about 100°C, and cools the dilute solution, so that the outlet temperature of the dilute solution of the hot water heat exchanger (i.e., the inlet temperature of the dilute solution of the flue gas heat exchanger) is reduced to below 60°C, thereby reducing the exhaust temperature of the unit to below 80°C, so that the heat of the low-temperature flue gas is fully recovered and utilized, and the coefficient of performance (COP) of heating is increased to above 0.962, so that the unit has higher operating economy and lower heating energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a previous direct-fired lithium bromide absorption cold and hot water unit.

[0021] Figure 2 This is a structural schematic diagram of Example 1 of a low-emission, high-efficiency, direct-fired lithium bromide absorption cold and hot water unit of the present invention.

[0022] Figure 3 This is a structural schematic diagram of Example 2 of a low-emission, high-efficiency, direct-fired lithium bromide absorption cold and hot water unit of the present invention.

[0023] Figure 4 This is a schematic structural diagram of Example 3 of a low-emission, high-efficiency, direct-fired lithium bromide absorption cold and hot water unit of the present invention.

[0024] Figure 5 This is a structural schematic diagram of Example 4 of a low-emission, high-efficiency, direct-fired lithium bromide absorption cold and hot water unit of the present invention.

[0025] in:

[0026] Evaporator 1, absorber 2, solution pump outlet pipe 3, solution switching valve 4, low-temperature heat exchanger dilute solution inlet pipe 5, low-temperature heat exchanger 6, high-temperature heat exchanger 7, refrigerant water heat exchanger liquid inlet pipe 8, burner 9, high-pressure generator liquid outlet pipe 10, direct-fired high-pressure generator 11, high-pressure generator liquid inlet pipe 12, flue gas heat exchanger liquid outlet pipe 13, flue gas heat exchanger 14, exhaust pipe 15, flue gas heat exchanger liquid inlet pipe 16, hot water heat exchanger 17 , hot water heat exchanger liquid inlet pipe 18, refrigerant steam pipe 19, refrigerant water heat exchanger 20, steam switching valve 21, high-temperature refrigerant water pipe 22, low-pressure generator 23, condenser 24, cooling water outlet pipe 25, hot water heat exchanger water outlet pipe 26, valve I 27, evaporator water outlet pipe 28, hot water heat exchanger water inlet pipe 29, valve II 30, evaporator water inlet pipe 31, solution pump 32, refrigerant pump 33, cooling water inlet pipe 34. DETAILED DESCRIPTION

[0027] The present invention is described below in conjunction with the accompanying drawings and specific embodiments:

[0028] Embodiment 1:

[0029] like Figure 2 As shown, a low-emission and high-efficiency direct-fired lithium bromide absorption cold and hot water unit includes an evaporator 1, an absorber 2, a direct-fired high-pressure generator 11, a low-pressure generator 23, a condenser 24, a high-temperature heat exchanger 7, a low-temperature heat exchanger 6, a flue gas heat exchanger 14, a refrigerant water heat exchanger 20, a solution pump 32 and a refrigerant pump 33, and is additionally provided with a hot water heat exchanger 17;

[0030] The hot water heat exchanger water inlet pipe 29 of the hot water heat exchanger 17 is connected to the evaporator water inlet pipe 31 of the evaporator 1, and a valve II 30 is provided on the pipe;

[0031] The hot water heat exchanger outlet pipe 26 of the hot water heat exchanger 17 is connected to the evaporator outlet pipe 28 of the evaporator 1, and a valve I 27 is provided on the pipe;

[0032] The solution flow of the flue gas heat exchanger 14 and the refrigerant water heat exchanger 20 is a series flow.

[0033] The hot water heat exchanger 17 is arranged on the flue gas heat exchanger liquid inlet pipe 16 of the flue gas heat exchanger 14;

[0034] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a series process.

[0035] In this embodiment, the flue gas heat exchanger 14 is arranged on the exhaust pipe 15 of the direct-fired high-pressure generator 11, the refrigerant water heat exchanger 20 is arranged on the high-temperature refrigerant water pipe 22 between the low-pressure generator 23 and the condenser 24, and the hot water heat exchanger 17 is arranged on the flue gas heat exchanger liquid inlet pipe 16 of the flue gas heat exchanger 14;

[0036] The hot water heat exchanger water inlet pipe 29 of the hot water heat exchanger 17 is connected to the evaporator water inlet pipe 31, and a valve II 30 is provided on the pipe; the hot water heat exchanger water outlet pipe 26 of the hot water heat exchanger 17 is connected to the evaporator water outlet pipe 28, and a valve I 27 is provided on the pipe; a solution switching valve 4 is installed on the pipeline between the high-pressure liquid discharge pipe 10 and the absorber 2, and a steam switching valve 21 is installed on the pipeline between the refrigerant steam pipe 19 and the evaporator 1.

[0037] In this embodiment, the working principle of a low-emission, high-efficiency, direct-fired lithium bromide absorption cold and hot water unit of the present invention is as follows:

[0038] When the unit is in refrigeration operation, the solution switching valve 4, the steam switching valve 21, the valve I 27 and the valve II 30 are closed, and the hot water heat exchanger 17 does not work and only serves as a solution circulation channel; a part of the low-temperature dilute solution transported by the solution pump 32 enters the refrigerant water heat exchanger 20 through the refrigerant water heat exchanger inlet pipe 8, exchanges heat with the high-temperature refrigerant water, so that part of the heat of the high-temperature refrigerant water is recovered and utilized; the dilute solution leaving the refrigerant water heat exchanger 20 enters the flue gas heat exchanger 14 through the hot water heat exchanger inlet pipe 18, the hot water heat exchanger 17 and the flue gas heat exchanger inlet pipe 16, exchanges heat with the flue gas discharged from the direct-fired high-pressure generator 11, and can reduce the exhaust gas temperature to about 100°C.

[0039] When the unit is in heating operation, the solution switching valve 4, the steam switching valve 21, the valve I 27 and the valve II 30 are opened, the low-pressure generator 23, the condenser 24, the refrigerant water heat exchanger 20, the high-temperature heat exchanger 7 and the low-temperature heat exchanger 6 do not work, and the refrigerant water heat exchanger 20, the high-temperature heat exchanger 7 and the low-temperature heat exchanger 6 only serve as solution circulation channels; a part of the high-temperature dilute solution with a temperature of about 100°C, which is transported by the solution pump 32, enters the hot water heat exchanger 17 through the refrigerant water heat exchanger inlet pipe 8, the refrigerant water heat exchanger 20 and the hot water heat exchanger inlet pipe 18, and is mixed with the evaporator water inlet pipe 31 and the hot water heat exchanger 18. The water inlet pipe 29 of the water heat exchanger enters the hot water heat exchanger, and the hot water with a temperature of about 50°C is used for heat exchange to cool the high-temperature dilute solution, so that the outlet temperature of the dilute solution of the hot water heat exchanger 17 is reduced to below 60°C; the dilute solution exiting the hot water heat exchanger 17 enters the flue gas heat exchanger 14 through the flue gas heat exchanger liquid inlet pipe 16, and exchanges heat with the flue gas discharged by the direct-fired high-pressure generator 11, so as to reduce the exhaust temperature of the unit to below 80°C, so that the heat of the low-temperature flue gas can be fully recovered and utilized, and the heating performance coefficient COP is increased to above 0.962, so that the unit operation is more economical and the heating energy consumption is lower.

[0040] Embodiment 2:

[0041] like Figure 3 As shown, in this embodiment, the hot water heat exchanger 17 is arranged on the flue gas heat exchanger liquid inlet pipe 16 of the flue gas heat exchanger 14;

[0042] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a parallel process.

[0043] Embodiment 3:

[0044] like Figure 4 As shown, in this embodiment, the hot water heat exchanger 17 is arranged on the refrigerant water heat exchanger liquid inlet pipe 8 of the refrigerant water heat exchanger 20;

[0045] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a series process.

[0046] Since the solution pipelines of the refrigerant water heat exchanger 20 and the flue gas heat exchanger 14 are in series structure, the working principle and effect of the unit in this embodiment are the same as those of the unit described in Example 1.

[0047] Embodiment 4:

[0048] like Figure 5 As shown, in this embodiment, the hot water heat exchanger 17 is arranged on the refrigerant water heat exchanger liquid inlet pipe 8 of the refrigerant water heat exchanger 20;

[0049] The cooling water process of the low-emission and high-efficiency direct-fired lithium bromide absorption chiller and hot water unit adopts a parallel process.

[0050] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A low-emission, high-energy-efficiency, direct-fired lithium bromide absorption chiller / hot water unit, comprising an evaporator (1), an absorber (2), a direct-fired high-pressure generator (11), a low-pressure generator (23), a condenser (24), a high-temperature heat exchanger (7), a low-temperature heat exchanger (6), a flue gas heat exchanger (14), a refrigerant water heat exchanger (20), a solution pump (32) and a refrigerant pump (33), characterized in that: A hot water heat exchanger (17) is additionally provided; The hot water heat exchanger water inlet pipe (29) of the hot water heat exchanger (17) is connected to the evaporator water inlet pipe (31) of the evaporator (1), and a valve II (30) is provided on the pipe; The hot water heat exchanger outlet pipe (26) of the hot water heat exchanger (17) is connected to the evaporator outlet pipe (28) of the evaporator (1), and a valve I (27) is provided on the pipe; The solution flow of the flue gas heat exchanger (14) and the refrigerant water heat exchanger (20) is a series flow; The flue gas heat exchanger (14) is arranged on the smoke exhaust pipe (15) of the direct-fired high-pressure generator (11); the flue gas heat exchanger liquid outlet pipe (13) of the flue gas heat exchanger (14) is connected to the high-temperature heat exchanger liquid inlet pipe (12) of the high-temperature heat exchanger (7); the high-temperature heat exchanger (7) is also connected to the low-temperature heat exchanger (6); and the low-temperature heat exchanger (6) is also connected to the solution pump (32) via the low-temperature heat exchanger dilute solution inlet pipe (5); The refrigerant water heat exchanger (20) is arranged on the high-temperature refrigerant water pipe (22) between the low-pressure generator (23) and the condenser (24), and the hot water heat exchanger (17) is arranged on the flue gas heat exchanger liquid inlet pipe (16) of the flue gas heat exchanger (14) or on the refrigerant water heat exchanger liquid inlet pipe (8) of the refrigerant water heat exchanger (20).

2. A low-emission, high-efficiency, direct-fired lithium bromide absorption chiller and hot water unit according to claim 1, characterized in that: The hot water heat exchanger (17) is arranged on the flue gas heat exchanger liquid inlet pipe (16) of the flue gas heat exchanger (14); the cooling water process of the low-emission and high-energy-efficiency direct-fired lithium bromide absorption hot and cold water unit adopts a series process.

3. A low-emission, high-efficiency, direct-fired lithium bromide absorption chiller and hot water unit according to claim 1, characterized in that: The hot water heat exchanger (17) is arranged on the flue gas heat exchanger liquid inlet pipe (16) of the flue gas heat exchanger (14); the cooling water process of the low-emission and high-energy-efficiency direct-fired lithium bromide absorption hot and cold water unit adopts a parallel process.

4. A low-emission, high-efficiency, direct-fired lithium bromide absorption chiller and hot water unit according to claim 1, characterized in that: The hot water heat exchanger (17) is arranged on the refrigerant water heat exchanger liquid inlet pipe (8) of the refrigerant water heat exchanger (20); the cooling water process of the low-emission and high-energy-efficiency direct-fired lithium bromide absorption hot and cold water unit adopts a series process.

5. A low-emission, high-efficiency, direct-fired lithium bromide absorption chiller and hot water unit according to claim 1, characterized in that: The hot water heat exchanger (17) is arranged on the refrigerant water heat exchanger liquid inlet pipe (8) of the refrigerant water heat exchanger (20); the cooling water process of the low-emission and high-energy-efficiency direct-fired lithium bromide absorption hot and cold water unit adopts a parallel process.

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