Heat source water segmented cooling type two-stage two-class absorption heat pump

Abstract

The utility model discloses a heat source water segmented cooling type two-stage two-class absorption heat pump, and belongs to the technical field of heat exchange equipment. Comprising a first-stage condenser, a second-stage condenser, a first-stage regenerator, a second-stage regenerator, a low-pressure evaporator, a low-pressure absorber, a high-pressure evaporator, a high-pressure absorber, a low-temperature heat exchanger, a high-temperature heat exchanger, a solution pump, a first-stage refrigerant feeding pump, a second-stage refrigerant feeding pump, a refrigerant circulating pump and a flash tank. The structure and process of heat source water segmented cooling and two-stage absorption and evaporation are adopted, refrigerant water circulation is conducted in a low-pressure absorber pipe, solution circulation is conducted outside the low-pressure absorber pipe, no heat transfer pipe is arranged in a high-pressure evaporator, the high-pressure evaporator conducts heat exchange in a refrigerant water flash evaporation mode, and refrigerant water flows through gravity and density difference; power devices such as a circulating pump do not need to be configured, the unit cost is reduced, heat source water cascade efficient utilization is achieved, the output grade and output of steam are improved, the heat exchange efficiency of the unit is improved, energy waste is avoided, and meanwhile stable operation of the unit can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange equipment, and specifically relates to a heat source water segmented temperature reduction type two-stage second-class absorption heat pump. Background Art

[0002] A large amount of high-temperature steam is required in the production process, and at the same time, there are a large amount of low-temperature waste heat resources. The use of Class II absorption heat pump units to extract low-temperature waste heat can produce high-temperature steam and save high-grade heat source consumption. It has been widely used in recent years. However, the low-temperature waste heat discharged by factory production is expected to be recycled and utilized to the maximum extent, and more high-grade steam can be produced at the same time. On the one hand, it can meet the cooling needs of low-temperature waste heat resources, and on the other hand, it can meet the needs of factory steam use. The structure, process and control technology of conventional Class II absorption heat pumps cannot significantly improve the quality of the produced steam. How to improve the heat exchange efficiency of the heat pump unit so that the absorption heat pump can operate efficiently and stably, and produce a large amount of high-grade steam, and at the same time use effective control to ensure that the liquid level in the flash tank remains stable and avoid fluctuations in steam production has become one of the important research topics at present. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and provide a two-stage second-type absorption heat pump with segmented cooling of heat source water. The structure and process of segmented cooling of heat source water and two-stage absorption and evaporation are adopted to realize efficient utilization of heat source water in stages, improve the output quality and output of steam, improve the heat exchange efficiency of the unit, avoid energy waste, and at the same time adopt effective control to ensure that the liquid level in the flash tank remains stable, avoid fluctuations in steam production, and ensure stable operation of the unit.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a heat source water segmented cooling type two-stage two-type absorption heat pump, including a primary condenser, a secondary condenser, a primary regenerator, a secondary regenerator, a low-pressure evaporator, a low-pressure absorber, a high-pressure evaporator, a high-pressure absorber, a low-temperature heat exchanger, a high-temperature heat exchanger, a solution pump, a primary refrigerant liquid feeding pump, a secondary refrigerant liquid feeding pump, a refrigerant circulation pump, and a flash tank, wherein the secondary condenser and the secondary regenerator are arranged on the upper part of the primary condenser and the primary regenerator, the low-pressure evaporator and the low-pressure absorber are arranged on the upper part of the secondary condenser and the secondary regenerator, the high-pressure evaporator and the high-pressure absorber are arranged on the upper part of the low-pressure evaporator and the low-pressure absorber, and the flash tank is arranged on the upper part of the high-pressure absorber; the primary condenser is connected to the heat exchanger. Cooling water pipeline A and cooling water pipeline B, the secondary condenser is connected to cooling water pipeline B and cooling water pipeline C, and the primary condenser and the secondary condenser are connected through cooling water pipeline B; the low-pressure evaporator is connected to heat source water pipeline A and heat source water pipeline B, the secondary regenerator is connected to heat source water pipeline C and heat source water pipeline D, the low-pressure evaporator and the primary regenerator are connected through heat source water pipeline B, and the primary regenerator and the secondary regenerator are connected through heat source water pipeline C; the primary condenser and the primary regenerator are connected through refrigerant steam channel A, the secondary condenser and the secondary regenerator are connected through refrigerant steam channel B, the low-pressure evaporator and the low-pressure absorber are connected through refrigerant steam channel C, and the high-pressure evaporator and the high-pressure absorber are connected through refrigerant steam channel D.

[0005] The first-stage condenser and the first-stage regenerator can be arranged in two cylinders or in one cylinder; the second-stage condenser and the second-stage regenerator can be arranged in two cylinders or in one cylinder; the low-pressure evaporator and the low-pressure absorber can be arranged in two cylinders or in one cylinder.

[0006] The primary regenerator and the low-temperature heat exchanger are connected through a concentrated solution pipeline A, on which a solution pump is arranged, the low-temperature heat exchanger and the high-temperature heat exchanger are connected through a concentrated solution pipeline B, the high-temperature heat exchanger and the high-pressure absorber are connected through a concentrated solution pipeline C and an intermediate concentration solution pipeline A, the high-temperature heat exchanger and the low-pressure absorber are connected through an intermediate concentration solution pipeline B, the low-pressure absorber and the low-temperature heat exchanger are connected through a dilute solution pipeline A, the low-temperature heat exchanger and the secondary regenerator are connected through a dilute solution pipeline B, the secondary regenerator and the primary regenerator are connected through an intermediate concentration solution pipeline C, no power device such as a circulating pump is configured between the high-pressure absorber, the high-temperature heat exchanger and the low-pressure absorber, no power device such as a circulating pump is configured between the low-pressure absorber, the low-temperature heat exchanger and the secondary regenerator, and no power device such as a circulating pump is configured between the secondary regenerator and the primary regenerator.

[0007] The low-pressure absorber and the high-pressure evaporator are connected through a refrigerant water pipeline C and a refrigerant water pipeline D. The low-pressure absorber tube has refrigerant water circulating inside and solution circulating outside. No heat transfer tube is arranged inside the high-pressure evaporator. The high-pressure evaporator performs heat exchange by flash evaporation of refrigerant water and is not equipped with power devices such as a circulating pump. The primary condenser and the low-pressure evaporator are connected through a refrigerant water pipeline A. A primary refrigerant liquid delivery pump is arranged on the refrigerant water pipeline A, and a frequency converter B is arranged on the primary refrigerant liquid delivery pump. The secondary condenser and the refrigerant water pipeline C are connected through a refrigerant water pipeline B. A secondary refrigerant liquid delivery pump and a refrigerant regulating valve A are arranged on the refrigerant water pipeline B, and a frequency converter A is arranged on the secondary refrigerant liquid delivery pump. The low-pressure evaporator is provided with a refrigerant liquid delivery pipeline, and a refrigerant circulating pump is arranged on the refrigerant liquid delivery pipeline. The refrigerant water pipeline C and the secondary condenser are connected through a refrigerant water pipeline E, and a refrigerant regulating valve B is arranged on the refrigerant water pipeline E.

[0008] The low-pressure evaporator and the high-pressure evaporator are respectively provided with a liquid level detection device B and a liquid level detection device A.

[0009] The high-pressure absorber and the flash tank are connected by hot water circulation pipeline A and hot water circulation pipeline B. The hot water circulation between the high-pressure absorber and the flash tank flows by gravity and density difference, and there is no need to configure power devices such as circulation pumps. The water supply pipeline is connected to the hot water circulation pipeline B, and a water supply control valve is arranged on the water supply pipeline. The flash tank is provided with a steam pipeline, a liquid level detection device C, a pressure sensor, and a safety discharge device, and a steam control valve is arranged on the steam pipeline.

[0010] The beneficial effects of the utility model are:

[0011] The heat source water is cooled for the first time in the low-pressure evaporator, for the second time in the first-stage regenerator, and for the third time in the second-stage regenerator, thus realizing the segmented cooling of the heat source water; the cooling water enters the first-stage condenser and the second-stage condenser in series to realize the segmented cooling of the refrigerant steam; the refrigerant water circulates inside the low-pressure absorber tube and the solution circulates outside the tube. No heat transfer tube is arranged inside the high-pressure evaporator, and the high-pressure evaporator exchanges heat by flash evaporation of the refrigerant water. The refrigerant water between the low-pressure absorber and the high-pressure evaporator flows by gravity and density difference, and there is no need to configure power devices such as circulating pumps. The heat in the low-pressure absorber is transferred to the high-pressure evaporator through the refrigerant water, and then transported to the high-pressure absorber. The two-stage absorption and evaporation structure and process are adopted to increase the temperature of the hot water in the high-pressure absorber, thereby increasing the pressure of the flash tank to produce steam. The structure and process of staged cooling of heat source water and two-stage absorption and evaporation are adopted to realize efficient cascade utilization of heat source water, improve the output pressure and output of steam, improve the heat exchange efficiency of the unit, avoid energy waste, meet the cooling needs of users' low-temperature waste heat resources, and meet the needs of high-grade use of factory steam. At the same time, effective control is adopted to ensure that the liquid level in the flash tank remains stable, avoid fluctuations in steam production, and ensure stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the structure of a heat source water segmented cooling type two-stage second-class absorption heat pump.

[0013] In the figure: primary condenser 1, secondary condenser 2, primary regenerator 3, secondary regenerator 4, low-pressure evaporator 5, low-pressure absorber 6, high-pressure evaporator 7, high-pressure absorber 8, low-temperature heat exchanger 9, high-temperature heat exchanger 10, solution pump 11, primary refrigerant liquid delivery pump 12, secondary refrigerant liquid delivery pump 13, refrigerant circulation pump 14, flash tank 15, inverter A16, inverter B17, refrigerant regulating valve A18, refrigerant regulating valve B19, liquid level detection device A20, liquid level detection device B21, concentrated solution pipeline A22, concentrated solution pipeline B23, concentrated solution pipeline C24, intermediate concentration solution pipeline A25, intermediate concentration solution pipeline B26, dilute solution pipeline A27, dilute solution pipeline B28, intermediate concentration Solution pipeline C29, refrigerant water pipeline A30, refrigerant water pipeline B31, refrigerant water pipeline C32, refrigerant water pipeline D33, refrigerant water pipeline E34, refrigerant steam channel A35, refrigerant steam channel B36, refrigerant steam channel C37, refrigerant steam channel D38, cooling water pipeline A39, cooling water pipeline B40, cooling water pipeline C41, heat source water pipeline A42, heat source water pipeline B43, heat source water pipeline C44, heat source water pipeline D45, hot water circulation pipeline A46, hot water circulation pipeline B47, make-up water pipeline 48, steam pipeline 49, steam control valve 50, make-up water control valve 51, liquid level detection device C52, pressure sensor 53, safety discharge device 54, refrigerant liquid delivery pipeline 55. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments. Example

[0015] like Figure 1As shown, the utility model relates to a heat source water segmented cooling type two-stage two-type absorption heat pump, comprising a primary condenser 1, a secondary condenser 2, a primary regenerator 3, a secondary regenerator 4, a low-pressure evaporator 5, a low-pressure absorber 6, a high-pressure evaporator 7, a high-pressure absorber 8, a low-temperature heat exchanger 9, a high-temperature heat exchanger 10, a solution pump 11, a primary refrigerant liquid delivery pump 12, a secondary refrigerant liquid delivery pump 13, a refrigerant circulation pump 14, and a flash tank 15, wherein the secondary condenser 2 and the secondary regenerator 4 are arranged on the upper part of the primary condenser 1 and the primary regenerator 3, the low-pressure evaporator 5 and the low-pressure absorber 6 are arranged on the upper part of the secondary condenser 2 and the secondary regenerator 4, the high-pressure evaporator 7 and the high-pressure absorber 8 are arranged on the upper part of the low-pressure evaporator 5 and the low-pressure absorber 6, and the flash tank 15 is arranged on the upper part of the high-pressure absorber 8; the primary condenser 1 is connected to the cooling water pipeline A39 and the cooling water Pipeline B40, the secondary condenser 2 is connected to the cooling water pipeline B40 and the cooling water pipeline C41, and the primary condenser 1 and the secondary condenser 2 are connected through the cooling water pipeline B40; the low-pressure evaporator 5 is connected to the heat source water pipeline A42 and the heat source water pipeline B43, the secondary regenerator 4 is connected to the heat source water pipeline C44 and the heat source water pipeline D45, the low-pressure evaporator 5 and the primary regenerator 3 are connected through the heat source water pipeline B43, and the primary regenerator 3 and the secondary regenerator 4 are connected through the heat source water pipeline C44; the primary condenser 1 and the primary regenerator 3 are connected through the refrigerant steam channel A35, the secondary condenser 2 and the secondary regenerator 4 are connected through the refrigerant steam channel B36, the low-pressure evaporator 5 and the low-pressure absorber 6 are connected through the refrigerant steam channel C37, and the high-pressure evaporator 7 and the high-pressure absorber 8 are connected through the refrigerant steam channel D38. The heat source water is connected in series to the low-pressure evaporator 5, the first-stage regenerator 3, and the second-stage regenerator 4 to realize segmented cooling, and the cooling water is connected in series to the first-stage condenser 1 and the second-stage condenser 2 to realize segmented cooling of the refrigerant steam, thereby realizing efficient cascade utilization of the heat source water, increasing the steam output, improving the heat exchange efficiency of the unit, and avoiding energy waste.

[0016] The first-stage condenser 1 and the first-stage regenerator 3 can be arranged in two cylinders or in one cylinder; the second-stage condenser 2 and the second-stage regenerator 4 can be arranged in two cylinders or in one cylinder; the low-pressure evaporator 5 and the low-pressure absorber 6 can be arranged in two cylinders or in one cylinder.

[0017] The primary regenerator 3 and the low-temperature heat exchanger 9 are connected via a concentrated solution pipeline A22, on which a solution pump 11 is provided, the low-temperature heat exchanger 9 and the high-temperature heat exchanger 10 are connected via a concentrated solution pipeline B23, the high-temperature heat exchanger 10 and the high-pressure absorber 8 are connected via a concentrated solution pipeline C24 and an intermediate concentration solution pipeline A25, the high-temperature heat exchanger 10 and the low-pressure absorber 6 are connected via an intermediate concentration solution pipeline B26, the low-pressure absorber 6 and the low-temperature heat exchanger 9 are connected via a weak solution pipeline A27, the low-temperature heat exchanger 9 and the secondary regenerator 3 ... The regenerators 4 are connected by a dilute solution pipeline B28, the secondary regenerator 4 and the primary regenerator 3 are connected by an intermediate concentration solution pipeline C29, the solution circulation between the high-pressure absorber 8, the high-temperature heat exchanger 10, and the low-pressure absorber 6 relies on gravity and pressure difference to flow, and there is no need to configure power devices such as circulation pumps, the solution circulation between the low-pressure absorber 6, the low-temperature heat exchanger 9, and the secondary regenerator 4 relies on gravity and pressure difference to flow, and there is no need to configure power devices such as circulation pumps, the solution circulation between the secondary regenerator 4 and the primary regenerator 3 relies on gravity and pressure difference to flow, and there is no need to configure power devices such as circulation pumps. The primary regenerator 3, the secondary regenerator 4, the low-pressure absorber 6, the high-pressure absorber 8, the low-temperature heat exchanger 9, the high-temperature heat exchanger 10, and the solution pump 11 form a solution cycle, that is, the concentrated solution from the primary regenerator 3 is transported to the high-pressure absorber 8 after being heated by the solution pump 11 through the low-temperature heat exchanger 9 and the high-temperature heat exchanger 10 in turn. The concentrated solution absorbs the heat of the refrigerant vapor from the high-pressure evaporator 7 through the refrigerant vapor channel D38 in the high-pressure absorber 8. The concentrated solution is diluted once to form an intermediate concentration solution. At the same time, the absorbed heat is released to the hot water in the hot water circulation pipeline A46 and the hot water circulation pipeline B47; the intermediate concentration solution enters the high-temperature heat exchanger 10 through the intermediate concentration solution pipeline A25 to heat the concentrated solution, and the intermediate concentration solution enters the low-pressure absorber 6 through the intermediate concentration solution pipeline B26 after the temperature of the intermediate concentration solution is reduced. The intermediate concentration solution in the low-pressure absorber 6 The heat of the refrigerant steam from the low-pressure evaporator 5 is absorbed through the refrigerant steam channel C37, and the intermediate concentration solution is diluted twice in the low-pressure absorber 6 to form a dilute solution. At the same time, the absorbed heat is released to the refrigerant water in the refrigerant water pipeline C32 and the refrigerant water pipeline D33; the dilute solution enters the low-temperature heat exchanger 9 through the dilute solution pipeline A27 to heat the concentrated solution, and then enters the secondary regenerator 4 through the dilute solution pipeline B28. The dilute solution is heated and concentrated by the heat source water in the secondary regenerator 4 to form an intermediate concentration solution, and the generated refrigerant steam enters the secondary condenser 2 through the refrigerant steam channel B36 for condensation; the intermediate concentration solution enters the primary regenerator 3 through the intermediate concentration solution pipeline C29, and the intermediate concentration solution is heated and concentrated by the heat source water in the primary regenerator 3 to form a concentrated solution, and the generated refrigerant steam enters the primary condenser 1 through the refrigerant steam channel A35 for condensation.

[0018] The low-pressure absorber 6 and the high-pressure evaporator 7 are connected by a refrigerant water pipeline C32 and a refrigerant water pipeline D33. The low-pressure absorber 6 has refrigerant water circulating inside the tube and solution circulating outside the tube. No heat transfer tube is arranged inside the high-pressure evaporator 7. The high-pressure evaporator 7 exchanges heat by flash evaporation of refrigerant water. The refrigerant water between the low-pressure absorber 6 and the high-pressure evaporator 7 flows by gravity and density difference, and there is no need to configure a power device such as a circulating pump. The heat in the low-pressure absorber 6 is transferred to the high-pressure evaporator 7 through the refrigerant water, and then transported to the high-pressure absorber 8, thereby increasing the temperature of the hot water in the high-pressure absorber 8, realizing the structure and process of two-stage absorption and evaporation, thereby increasing the pressure of the flash tank 15 to produce steam, meeting the cooling demand of the user's low-temperature waste heat resources, and at the same time meeting The demand for high-grade use of factory steam is met; the primary condenser 1 and the low-pressure evaporator 5 are connected through the refrigerant water pipeline A30, and the refrigerant water pipeline A30 is provided with a primary refrigerant liquid delivery pump 12, and the primary refrigerant liquid delivery pump 12 is equipped with a frequency converter B17; the secondary condenser 2 and the refrigerant water pipeline C32 are connected through the refrigerant water pipeline B31, and the refrigerant water pipeline B31 is provided with a secondary refrigerant liquid delivery pump 13 and a refrigerant regulating valve A18, and the secondary refrigerant liquid delivery pump 13 is equipped with a frequency converter A16; the low-pressure evaporator 5 is provided with a refrigerant liquid delivery pipeline 55, and the refrigerant circulation pump 14 is provided on the refrigerant liquid delivery pipeline 55; the refrigerant water pipeline C32 and the secondary condenser 2 are connected through the refrigerant water pipeline E34, and the refrigerant regulating valve B19 is provided on the refrigerant water pipeline E34. The primary condenser 1, the secondary condenser 2, the low-pressure evaporator 5, the low-pressure absorber 6, the high-pressure evaporator 7, the primary refrigerant liquid delivery pump 12, the secondary refrigerant liquid delivery pump 13, and the refrigerant circulation pump 14 form a refrigerant water cycle, that is, the refrigerant water in the low-pressure absorber 6 tube absorbs the heat from the solution outside the low-pressure absorber 6 tube, and after the refrigerant water is heated, it enters the high-pressure evaporator 7 through the refrigerant water pipeline D33 to flash evaporate to form high-temperature refrigerant steam, and the high-temperature refrigerant steam enters the high-pressure absorber 8 through the refrigerant steam channel D38, and the refrigerant water enters the low-pressure absorber 6 tube through the refrigerant water pipeline C32 to be heated and heated; the refrigerant water stored in the lower part of the low-pressure evaporator 5 is transported to the The upper part of the low-pressure evaporator 5 is then dripped onto the heat transfer tube of the low-pressure evaporator 5 to absorb the heat from the heat source water to form refrigerant steam, and the refrigerant steam enters the low-pressure absorber 6 through the refrigerant steam channel C37; the secondary condenser 2 is used to condense the refrigerant steam from the secondary regenerator 4 to form refrigerant water, and the refrigerant water is transported to the refrigerant water pipeline B31 to the refrigerant water pipeline C32 through the secondary refrigerant liquid delivery pump 13, which is used to replenish the refrigerant liquid in the high-pressure evaporator 7; the primary condenser 1 is used to condense the refrigerant steam from the primary regenerator 3 to form refrigerant water, and the refrigerant water is transported to the low-pressure evaporator 5 through the refrigerant water pipeline A30 through the primary refrigerant liquid delivery pump 12, which is used to replenish the refrigerant liquid in the low-pressure evaporator 5.

[0019] The low-pressure evaporator 5 and the high-pressure evaporator 7 are respectively provided with a liquid level detection device B21 and a liquid level detection device A20 for detecting the liquid storage height in the low-pressure evaporator 5 and the high-pressure evaporator 7. The liquid level detection device A20 sets three detection liquid levels of low liquid level, middle liquid level and high liquid level, and the liquid level detection device B21 sets two detection liquid levels of low liquid level and high liquid level. When the liquid level detection device A20 detects that the high-pressure evaporator 7 is at a high liquid level, the secondary refrigerant liquid delivery pump 13 stops running, closes the refrigerant regulating valve A18, opens the refrigerant regulating valve B19, and the refrigerant water overflows to the secondary condenser 2 through the refrigerant water pipeline E34, and the liquid level in the high-pressure evaporator 7 decreases accordingly; when the liquid level detection device A20 detects that the high-pressure evaporator 7 is at an intermediate liquid level, the secondary refrigerant liquid delivery pump 13 starts low-frequency operation, opens the refrigerant regulating valve A18, closes the refrigerant regulating valve B19, and adjusts the operating frequency of the secondary refrigerant liquid delivery pump 13 through the frequency converter A16; when the liquid level detection device A20 detects that the high-pressure evaporator 7 is at a low liquid level, the secondary refrigerant liquid delivery pump 13 runs at a high frequency, increases the opening of the refrigerant regulating valve A18, keeps the refrigerant regulating valve B19 closed, and quickly replenishes the refrigerant liquid level in the high-pressure evaporator 7. Effective control is adopted to ensure that the liquid level in the high-pressure evaporator 7 remains stable, thereby ensuring the stable operation of the unit. When the liquid level detection device B21 detects that the low-pressure evaporator 5 is at a high liquid level, the operating frequency of the first-stage refrigerant delivery pump 12 is reduced through the frequency converter B17, thereby reducing the flow rate of refrigerant water delivered to the low-pressure evaporator 5 by the first-stage refrigerant delivery pump 12; when the liquid level detection device B21 detects that the low-pressure evaporator 5 is at a low liquid level, the operating frequency of the first-stage refrigerant delivery pump 12 is increased through the frequency converter B17, thereby increasing the flow rate of refrigerant water delivered to the low-pressure evaporator 5 by the first-stage refrigerant delivery pump 12. Effective control is adopted to ensure that the liquid level in the low-pressure evaporator 5 remains stable, thereby ensuring the stable operation of the unit.

[0020] The high-pressure absorber 8 and the flash tank 15 are connected by hot water circulation pipeline A46 and hot water circulation pipeline B47. The hot water circulation between the high-pressure absorber 8 and the flash tank 15 flows by gravity and density difference, and there is no need to configure power devices such as circulation pumps. The water supply pipeline 48 is connected to the hot water circulation pipeline B47, and a water supply control valve 51 is arranged on the water supply pipeline 48. The flash tank 15 is provided with a steam pipeline 49, a liquid level detection device C52, a pressure sensor 53, and a safety discharge device 54, and a steam control valve 50 is arranged on the steam pipeline 49. The heat in the low-pressure absorber 6 is transferred to the high-pressure evaporator 7 through the refrigerant water. The high-pressure absorber 8 absorbs the heat of the high-temperature refrigerant steam formed by flash evaporation in the high-pressure evaporator 7. The hot water stored in the flash tank 15 enters the high-pressure absorber 8 through the hot water circulation pipeline B47. After being heated and heated, the hot water enters the flash tank 15 through the hot water circulation pipeline A46 to flash out high-pressure steam. When the pressure of the flash tank 15 detected by the pressure sensor 53 is higher than the set value, the steam control valve 50 is opened, and the high-pressure steam is transported to the user through the steam pipeline 49. When the flash tank 15 is over-pressured, the high-pressure steam is discharged from the flash tank 15 through the safety discharge device 54. At the same time, the water supply control valve 51 performs start-stop control and opening adjustment according to the height of the liquid level in the flash tank 15 detected by the liquid level detection device C52. Effective control is adopted to ensure that the liquid level in the flash tank 15 remains stable, avoid fluctuations in steam production, and ensure stable operation of the unit.

[0021] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A heat source water staged cooling type two-stage second-class absorption heat pump, characterized in that: The invention comprises a primary condenser (1), a secondary condenser (2), a primary regenerator (3), a secondary regenerator (4), a low-pressure evaporator (5), a low-pressure absorber (6), a high-pressure evaporator (7), a high-pressure absorber (8), a low-temperature heat exchanger (9), a high-temperature heat exchanger (10), a solution pump (11), a primary refrigerant liquid delivery pump (12), a secondary refrigerant liquid delivery pump (13), a refrigerant circulation pump (14), and a flash tank (15), wherein the secondary condenser (2) and the secondary regenerator (4) are arranged on the upper part of the primary condenser (1) and the primary regenerator (3), the low-pressure evaporator (5) and the low-pressure absorber (6) are arranged on the upper part of the secondary condenser (2) and the secondary regenerator (4), the high-pressure evaporator (7) and the high-pressure absorber (8) are arranged on the upper part of the low-pressure evaporator (5) and the low-pressure absorber (6), and the flash tank (15) is arranged on the upper part of the high-pressure absorber (8); The primary condenser (1) is connected to the cooling water pipeline A (39) and the cooling water pipeline B (40), the secondary condenser (2) is connected to the cooling water pipeline B (40) and the cooling water pipeline C (41), and the primary condenser (1) and the secondary condenser (2) are connected via the cooling water pipeline B (40); the low-pressure evaporator (5) is connected to the heat source water pipeline A (42) and the heat source water pipeline B (43), the secondary regenerator (4) is connected to the heat source water pipeline C (44) and the heat source water pipeline D (45), and the low-pressure evaporator (5) and the primary regenerator (3) are connected via the heat source The first regenerator (3) and the second regenerator (4) are connected via a water pipeline B (43); the first regenerator (3) and the second regenerator (4) are connected via a heat source water pipeline C (44); the first condenser (1) and the first regenerator (3) are connected via a refrigerant steam channel A (35); the second condenser (2) and the second regenerator (4) are connected via a refrigerant steam channel B (36); the low-pressure evaporator (5) and the low-pressure absorber (6) are connected via a refrigerant steam channel C (37); and the high-pressure evaporator (7) and the high-pressure absorber (8) are connected via a refrigerant steam channel D (38).

2. A heat source water segmented cooling type two-stage two-type absorption heat pump according to claim 1, characterized in that: The first-stage condenser (1) and the first-stage regenerator (3) are arranged in two cylinders or in one cylinder; the second-stage condenser (2) and the second-stage regenerator (4) are arranged in two cylinders or in one cylinder; the low-pressure evaporator (5) and the low-pressure absorber (6) are arranged in two cylinders or in one cylinder.

3. A heat source water staged cooling type two-stage two-type absorption heat pump according to claim 1, characterized in that: The primary regenerator (3) and the low-temperature heat exchanger (9) are connected via a concentrated solution pipeline A (22), and a solution pump (11) is provided on the concentrated solution pipeline A (22). The low-temperature heat exchanger (9) and the high-temperature heat exchanger (10) are connected via a concentrated solution pipeline B (23). The high-temperature heat exchanger (10) and the high-pressure absorber (8) are connected via a concentrated solution pipeline C (24) and an intermediate concentration solution pipeline A (25). The high-temperature heat exchanger (10) and the low-pressure absorber (6) are connected via an intermediate concentration solution pipeline B (26). The low-temperature heat exchanger (9) and the secondary regenerator (4) are connected via a dilute solution pipeline A (27); the low-temperature heat exchanger (9) and the secondary regenerator (4) are connected via a dilute solution pipeline B (28); the secondary regenerator (4) and the primary regenerator (3) are connected via an intermediate concentration solution pipeline C (29); no power device such as a circulating pump is configured between the high-pressure absorber (8), the high-temperature heat exchanger (10), and the low-pressure absorber (6); no power device such as a circulating pump is configured between the low-pressure absorber (6), the low-temperature heat exchanger (9), and the secondary regenerator (4); and no power device such as a circulating pump is configured between the secondary regenerator (4) and the primary regenerator (3).

4. A heat source water staged cooling type two-stage two-type absorption heat pump according to claim 1, characterized in that: The low-pressure absorber (6) and the high-pressure evaporator (7) are connected via a refrigerant water pipeline C (32) and a refrigerant water pipeline D (33). The low-pressure absorber (6) has refrigerant water circulating inside the tube and solution circulating outside the tube. No heat transfer tube is provided inside the high-pressure evaporator (7). The high-pressure evaporator (7) performs heat exchange by flash evaporation of refrigerant water and is not equipped with a power device such as a circulating pump. The primary condenser (1) and the low-pressure evaporator (5) are connected via a refrigerant water pipeline A (30). A primary refrigerant liquid delivery pump (12) is provided on the refrigerant water pipeline A (30). The primary refrigerant liquid delivery pump (12) is equipped with a frequency converter B ( 17); the secondary condenser (2) and the refrigerant water pipeline C (32) are connected via a refrigerant water pipeline B (31), a secondary refrigerant liquid delivery pump (13) and a refrigerant regulating valve A (18) are provided on the refrigerant water pipeline B (31), and a frequency converter A (16) is configured on the secondary refrigerant liquid delivery pump (13); a refrigerant liquid delivery pipeline (55) is provided on the low-pressure evaporator (5), and a refrigerant circulation pump (14) is provided on the refrigerant liquid delivery pipeline (55); the refrigerant water pipeline C (32) and the secondary condenser (2) are connected via a refrigerant water pipeline E (34), and a refrigerant regulating valve B (19) is provided on the refrigerant water pipeline E (34).

5. A heat source water segmented cooling type two-stage two-type absorption heat pump according to claim 1, characterized in that: The low-pressure evaporator (5) and the high-pressure evaporator (7) are provided with a liquid level detection device B (21) and a liquid level detection device A (20), respectively.

6. A heat source water segmented cooling type two-stage two-type absorption heat pump according to claim 1, characterized in that: The high-pressure absorber (8) and the flash tank (15) are connected via a hot water circulation pipeline A (46) and a hot water circulation pipeline B (47). No power device such as a circulation pump is arranged between the high-pressure absorber (8) and the flash tank (15). The water supply pipeline (48) is connected to the hot water circulation pipeline B (47). A water supply control valve (51) is arranged on the water supply pipeline (48). The flash tank (15) is provided with a steam pipeline (49), a liquid level detection device C (52), a pressure sensor (53), and a safety discharge device (54). The steam pipeline (49) is provided with a steam control valve (50).

Images