Type II heat pump units and chemical plants

Abstract

The embodiment of the present application discloses a type II heat pump unit and a chemical plant, which belongs to the field of heat pump technology and can realize a type II heat pump unit with a shared heat exchange surface. The unit includes: a first heat pump, provided with a heat transfer tube bundle for conveying a first heat source; the first heat pump is used to connect to a production device; a second heat pump, provided with a heat transfer tube bundle for conveying the first heat source and the second heat source; the heat source index of the first heat source is higher than the heat source index of the second heat source; the first heat pump is connected to the second heat pump through a shared heat transfer tube bundle, wherein the shared heat transfer tube bundle is used to convey the circulating working fluid of one of the first heat pump and the second heat pump, and the shared heat transfer tube bundle is also used to exchange heat between the circulating working fluid of the one heat pump and the circulating working fluid of the other of the first heat pump and the second heat pump.

Description

Technical Field

[0001] This document relates to the field of heat pump technology, and in particular to a type II heat pump unit and a chemical plant. Background Art

[0002] A heat pump is a device that uses external energy to transfer heat. It can extract heat from a low-temperature environment and transfer it to a high-temperature environment. Heat pumps often achieve heat transfer through the phase change of the refrigerant during the evaporation and condensation process. Heat pumps are widely used, such as house heating and cooling, production and living hot water supply, industrial product manufacturing, etc. Among them, the second type of heat pump is a warming type heat pump, which can use a large amount of medium-temperature waste heat generated in industrial production to produce high-grade heat medium, which can be reused in process production to achieve the purpose of waste heat recovery. The second type of heat pump is of great significance to promoting environmental protection, improving energy efficiency and reducing waste heat emissions.

[0003] At present, ordinary Class II heat pumps with low medium-temperature heat sources often use a multi-stage structure of two or more to produce heat medium. However, the multi-stage structure requires a large number of working fluid conversions and each stage requires a separate heat transfer tube bundle, resulting in a very low heat source utilization rate and high equipment costs. Summary of the invention

[0004] The purpose of the embodiments of this specification is to provide a type II heat pump unit and a chemical plant to avoid the problem of low energy efficiency of the type II heat pump due to the multi-stage structure, and to realize a type II heat pump unit with a shared heat exchange surface to produce high-quality heat medium without the need for a two-stage structure / multi-stage structure, thereby improving the equipment cost and energy utilization of the type II heat pump unit.

[0005] In order to achieve the above purpose, the embodiments of this specification adopt the following scheme:

[0006] In a first aspect, a second type heat pump unit is provided, comprising:

[0007] A first heat pump is provided with a heat transfer tube bundle for conveying a first heat source; the first heat pump is used to be connected to a production device;

[0008] A second heat pump is provided with a heat transfer tube bundle for transporting the first heat source and the second heat source; the heat source index of the first heat source is higher than the heat source index of the second heat source;

[0009] A common heat transfer tube bundle is connected to the inner cavity of one of the first heat pump and the second heat pump, and the common heat transfer tube bundle is arranged in the inner cavity of the other of the first heat pump and the second heat pump; wherein,

[0010] The heat transfer tube bundle of the first heat pump and the common heat transfer tube bundle are used to drive the working medium circulation of the first heat pump; the heat transfer tube bundle of the second heat pump and the common heat transfer tube bundle are used to drive the working medium circulation of the second heat pump.

[0011] In a second aspect, a chemical plant is provided, comprising: a production device and a heat pump unit connected to the production device, wherein the heat pump unit is the aforementioned second-class heat pump unit.

[0012] In the scheme of the embodiments of the present specification, the common heat transfer tube bundle is connected with a heat pump cavity and arranged in another heat pump cavity to realize a common heat exchange surface between the first heat pump and the second heat pump. The first heat pump can drive the internal working fluid circulation by using the first heat source and the heat source on the common heat exchange surface through the corresponding heat transfer tube bundle and the common heat transfer tube bundle. The second heat pump can drive the internal working fluid circulation by using the first heat source and the second heat source through the corresponding heat transfer tube bundle and the common heat transfer tube bundle, and at the same time provide the corresponding heat source heat on the common heat exchange surface. Without using a compressor, the first heat pump and the second heat pump do not need to use a multi-stage structure of two or more stages, the number of working fluid conversions is small, and the heat source utilization rate is improved. In addition, the second type of heat pump unit composed of the first heat pump and the second heat pump also supports a non-two-stage structure (at least supports the reduction of one set of heat transfer tube bundles), thereby reducing equipment costs.

[0013] Other features and advantages of the embodiments of this specification will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide further understanding of this specification and constitute a part of this specification. The illustrative embodiments of this specification and their descriptions are used to explain this specification and do not constitute improper limitations on this specification.

[0015] In the attached picture:

[0016] Figure 1 This is a schematic diagram of an exemplary second-class heat pump unit architecture of an embodiment of this specification;

[0017] Figure 2 It is a schematic cross-sectional view of the equipment structure of an exemplary type II heat pump unit according to an embodiment of this specification;

[0018] Figure 3 It is a schematic cross-sectional view of the equipment structure of an exemplary type II heat pump unit according to an embodiment of this specification;

[0019] Figure 4 This is a schematic diagram of an exemplary second-class heat pump unit architecture of an embodiment of this specification;

[0020] Figure 5It is a schematic cross-sectional view of the equipment structure of an exemplary type II heat pump unit according to an embodiment of this specification;

[0021] Figure 6 It is a schematic cross-sectional view of the equipment structure of an exemplary type II heat pump unit according to an embodiment of this specification;

[0022] Figure 7 This is a schematic diagram of an exemplary chemical plant architecture of an embodiment of this specification. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this specification clearer, the technical solutions of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0024] As mentioned above, most of the common second-class heat pumps for medium-temperature heat sources with low temperatures use a multi-stage structure of two or more stages to utilize the waste heat. For example, a two-stage heat pump structure can be tried, which may include two generators, two condensers, two absorbers and two evaporators, etc. In addition to using heat transfer tube bundles inside each device, it is also necessary to use tube bundles to connect the corresponding devices to each other.

[0025] However, the pipelines between the two-stage structure are intricate, the overall structure of the heat pump unit is complex, and the equipment cost and maintenance cost are high. At the same time, it is difficult to simply delete the components and tube bundles without affecting the heat pump reaction in the unit, and the affected units will find it difficult to produce high-quality heat medium.

[0026] In view of this, the solution of this specification provides a solution for a Class II heat pump unit and a chemical plant, which adopts a structure in which a first heat pump and a second heat pump are combined through a common heat exchange surface to realize an overall Class II heat pump unit. The Class II heat pump unit can use a relatively low-temperature medium-temperature heat source and does not require a two-stage structure / multi-stage structure to produce high-quality heat medium.

[0027] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.

[0028] One embodiment of this specification provides a second type of heat pump unit, please refer to Figure 1 The second type heat pump unit A1000 may include:

[0029] The first heat pump A1001 is provided with a heat transfer tube bundle for conveying the first heat source. The heat transfer tube bundle of the first heat pump A1001 can be connected to the first heat source, and further can be connected to the inflow end MI and the outflow end MO of the first heat source; the first heat pump A1001 is used to connect to the production device A1002;

[0030] The second heat pump A1003 is provided with a heat transfer tube bundle for transporting the first heat source and the second heat source. The heat transfer tube bundle of the second heat pump A1003 can be connected to the first heat source and also to the second heat source, and further can be connected to the inflow end MI and the outflow end MO of the first heat source and also to the inflow end LI and the outflow end LO of the second heat source; the heat source index of the first heat source is higher than the heat source index of the second heat source;

[0031] The common heat transfer tube bundle A1004 is connected to the inner cavity (for circulating working medium) of one of the first heat pump A1001 and the second heat pump A1003, and the common heat transfer tube bundle A1004 is arranged in the inner cavity (for circulating working medium) of the other of the first heat pump A1001 and the second heat pump A1003; the first heat pump A1001 is connected to the second heat pump A1003 through the common heat transfer tube bundle A1004, or the second heat pump A1003 is connected to the first heat pump A1001 through the common heat transfer tube bundle A1004, wherein the common heat transfer tube bundle A1004 is used to transport the circulating working medium ( Figure 1 The one heat pump may be the second heat pump A1003), and the common heat transfer tube bundle is also used to transfer the circulating working fluid of the one heat pump to the other heat pump ( Figure 1 The other heat pump may be the circulating working medium heat exchanger of the first heat pump A1001);

[0032] The heat transfer tube bundle of the first heat pump A1001 and the common heat transfer tube bundle A1004 are used to drive the working fluid cycle A1005 of the first heat pump A1001; the heat transfer tube bundle of the second heat pump A1003 and the common heat transfer tube bundle A1004 are used to drive the working fluid cycle A1006 of the second heat pump A1003.

[0033] In the embodiments of this specification, the (first) first type of heat pump (second heat pump A1003) can be an absorption heat pump, which can use the high temperature heat source in the warm waste heat source as the driving energy, and output the medium temperature heat source through the circulation process of the absorbent (preferably a solution) and the refrigerant and other working fluids, in order to increase the heat. The (second) type of heat pump (first heat pump A1001) can also be an absorption heat pump, which consumes the medium temperature heat source to provide a small amount of high temperature heat energy to produce a heat pump with a higher grade of heat medium, which can be used for production. The heat source index can include indicators such as temperature and temperature mapping value. The heat source entering the evaporator or generator can be a medium temperature heat source, that is, the first heat source; the heat source entering the condenser can be a low temperature heat source, that is, the second heat source; the heat source output from the absorber for production heating can be a high temperature heat source. The medium temperature heat source can be used as a heat source for the consumed heat, so that the high temperature heat source is output. It can be understood that in a unit that has been put into normal and stable production, the temperature of the high temperature heat source can be higher than the temperature of the medium temperature heat source, and the temperature of the medium temperature heat source can be higher than the temperature of the low temperature heat source. The terms "first" and "second" in the embodiments of this specification are only used to describe the distinction and do not indicate the meaning of order, importance, etc.

[0034] In some possible implementations, the aforementioned first heat pump A1001 can be regarded as a second-class heat pump. The common heat transfer tube bundle A1004 (i.e., the space inside the tube) is connected to the inner cavity (for circulating working fluid) of the second heat pump A1003, and the common heat transfer tube A1004 (i.e., the tube body) is arranged in the inner cavity (for circulating working fluid) of the first heat pump A1001 (the outer space of the common heat transfer tube A1004 is the inner cavity space of the first heat pump A1001).

[0035] In the first possible example, see Figure 2 The first heat pump A1001 may include a first absorber A1100, a first generator A1103, a first condenser A1106 and a first evaporator A1107.

[0036] The aforementioned first heat pump A1001 can be an integrated type, and the first absorber A1100, the first generator A1103, the first condenser A1106 and the first evaporator A1107 can be arranged in the same heat pump housing, the first generator A1103 and the first condenser A1106 are arranged at the lower part of the first heat pump A1001, and the first evaporator A1107 and the first absorber A1100 are arranged at the upper part of the first heat pump A1001, so as to reduce the pipelines between the components and the power pump of the working fluid circulation A1005. A first liquid channel is arranged between the first condenser A1106 and the first evaporator A1107, a first steam channel is arranged between the first evaporator A1107 and the first absorber A1100, a second liquid channel is arranged between the first absorber A1100 and the first generator A1103, and a second steam channel is arranged between the first generator A1103 and the first condenser A1106; the first liquid channel, the first steam channel, the second liquid channel and the second steam channel constitute a circulation channel for circulating the working fluid of the first heat pump, and can provide a channel basis for the working fluid circulation A1005.

[0037] In the first possible example, the first heat pump A1001 may also include a first solution pump A1116 and a first solution exchanger A1115; the first absorber A1100 may include a first absorber heat transfer tube bundle A1101 and a first absorber liquid distribution device A1102 for distributing liquid in the first absorber heat transfer tube bundle A1101, the first absorber heat transfer tube bundle A1101 is used to transport the working fluid of the production device A1002, the production device A1002 may preferably be a steam-water separator, the inlet and outlet of the first absorber heat transfer tube bundle A1101 are connected to the steam-water separator shell, the production device A1002 outputs high-temperature hot steam through the steam-water separator steam outlet A1110 for use in production activities, the production device A1002 also includes a steam-water separator water replenishment port A1111 and a steam-water separator sewage outlet A1112. The production unit A1002 can be arranged at a height higher than the first heat pump A1001, and the working fluid in the first absorber heat transfer tube bundle A1101 circulates naturally with the production unit A1002, thereby avoiding vibration defects that may be caused by the bursting of a large number of bubbles in the flowing hot water due to the use of a power pump, and avoiding the power consumption of a large number of internal circulation pumps, further reducing costs.

[0038] In the first possible example, the first absorber A1100 can be used to produce a first solution, and the first solution can be a dilute solution. The first generator A1103 can include a first generator heat transfer tube bundle A1104 and a first generator liquid distribution device A1105 for distributing liquid to the first generator heat transfer tube bundle A1104; wherein the first generator A1103 is used to generate a first refrigerant vapor and a second solution; the solution index of the second solution is higher than the solution index of the first solution, the second solution can be a concentrated solution, and the solution index can include indicators such as concentration or concentration mapping value.

[0039] In the first possible example, the first absorber A1100 may be connected to the first generator liquid distribution device A1105 through the first solution exchanger A1115, and is used to transport the first solution to the first generator A1103 to generate the second solution, wherein the first generator liquid distribution device A1105 may spray the first solution to the first generator heat transfer tube bundle A1104, and under the action of the medium-temperature heat source in the first generator heat transfer tube bundle A1104, the second solution and the first refrigerant vapor will be generated; the first generator A1103 may also pump the first solution through the first solution pump A1115. 116 is connected to the first solution exchanger A1115, and the first solution exchanger A1115 is also connected to the first absorber A1100, and is used to transport the second solution to the first absorber liquid distribution device A1102 to produce the first solution, wherein the first absorber liquid distribution device A1102 can spray the second solution to the first absorber heat transfer tube bundle A1101, and the second solution absorbs the refrigerant vapor from the first evaporator A1107 to form the first solution, so that the aforementioned second liquid channel can be formed between the first absorber A1100 and the first generator A1103. At the same time, the working fluid of the production device A1002 in the first absorber heat transfer tube bundle A1101 is heated to produce high-grade hot steam.

[0040] In the first possible example, the first heat pump A1001 may further include a refrigerant pump A1117; the common heat transfer tube bundle A1004 may be disposed in the first condenser A1106; the first condenser A1106 is used to generate a first refrigerant liquid through the first refrigerant vapor. The first refrigerant vapor may be transported through a second steam channel between the first generator A1103 and the first condenser A1106.

[0041] In this first possible example, the first evaporator A1107 may include a first evaporator heat transfer tube bundle A1108 and a first evaporator liquid distribution device A1109 for distributing liquid to the first evaporator heat transfer tube bundle A1108. The first evaporator heat transfer tube bundle A1108 is connected to the first generator heat transfer tube bundle A1104 for transporting the first heat source, which may be a medium-temperature heat source. The first evaporator A1107 is used to generate the second refrigerant vapor; the first condenser A1106 is connected to the first evaporator liquid distribution device A1109 through the refrigerant pump A1117, and is used to transport the first refrigerant liquid to the first evaporator to generate the second refrigerant vapor, wherein the first evaporator liquid distribution device A1109 can spray the first refrigerant liquid to the first evaporator heat transfer tube bundle A1108, and under the action of the medium-temperature heat source in the first evaporator heat transfer tube bundle A1108, the second refrigerant vapor is generated in the first evaporator A1107, and the second refrigerant vapor is absorbed by the second solution in the first absorber A1100 to generate the first solution, thereby forming a first liquid channel between the first condenser A1106 and the first evaporator A1107. The second refrigerant vapor can be transported in the first steam channel between the first evaporator A1107 and the first absorber A1100. The aforementioned steam channels can be realized by setting any one of the liquid blocking devices that pass steam / gas and block liquid between the devices. For example, a first liquid blocking device is provided in the first steam channel between the first evaporator A1107 and the first absorber A1100, and the inner cavity of the first evaporator A1107 is connected with the inner cavity of the first absorber A1100 through the first liquid blocking device. The second steam channel between the first generator A1103 and the first condenser A1106 is also provided with a second liquid blocking device, and the inner cavity of the first generator A1103 is connected with the inner cavity of the first condenser A1106 through the second liquid blocking device, so that steam can pass through but liquid cannot pass through.

[0042] It should be noted that, for example, each liquid retaining device can be an integrated device including components such as a filter structure and a partition. The specific structure of the liquid retaining device is not limited in the embodiments of this specification. For example, in some preferred examples, the liquid retaining device can be a filter structure and does not include a partition, and the partition is integrated with the housing of the heat pump, and the structure is simpler. Figure 2 In the schematic diagram of the cross-sectional structure principle, the first partition A1113 located between the first evaporator A1107 and the first absorber A1100 corresponds to the first liquid blocking device, and the second partition A1114 located between the first generator A1103 and the first condenser A1106 corresponds to the second liquid blocking device. The first liquid blocking device and the second liquid blocking device are not shown, and the liquid blocking method can be designed and selected according to actual needs.

[0043] In this first possible example, the second heat pump A1003 can be regarded as a type I heat pump. Figure 2 The second heat pump A1003 includes: a second absorber A1118, a second generator A1121, a second condenser A1124 and a second evaporator A1126.

[0044] In the first possible example, the second heat pump A1003 may also be integrated, and the second absorber A1118, the second generator A1121, the second condenser A1124 and the second evaporator A1126 may be arranged in the same heat pump housing, the second generator A1121 and the second condenser A1124 are arranged at the upper part of the second heat pump A1003, and the second absorber A1118 and the second evaporator A1126 are arranged at the lower part of the second heat pump A1003, so as to reduce the pipelines between the components and the power pump of the working medium circulation A1006. A third liquid channel is provided between the second condenser A1124 and the second evaporator A1126, a third steam channel is provided between the second evaporator A1126 and the second absorber A1118, a fourth liquid channel is provided between the second absorber A1118 and the second generator A1121, and a fourth steam channel is provided between the second generator A1121 and the second condenser A1124. The third liquid channel, the third steam channel, the fourth liquid channel and the fourth steam channel constitute a circulation channel for circulating the working fluid of the second heat pump, and together with the common heat transfer tube bundle A1004, provide a channel basis for the working fluid circulation A1006 for the second heat pump A1003.

[0045] In the first possible example, the second heat pump A1003 may also include a second solution pump A1127 and a second solution exchanger A1128; the second absorber A1118 may include a second absorber heat transfer tube bundle A1119 and a second absorber liquid distribution device A1120 for distributing liquid in the second absorber heat transfer tube bundle A1119; the second absorber A1118 is used to produce a third solution, which may be a dilute solution. The second generator A1121 includes a second generator heat transfer tube bundle A1122 and a second generator liquid distribution device A1123 for distributing liquid in the second generator heat transfer tube bundle A1122; the second generator heat transfer tube bundle A1122 is used to transport the first heat source.

[0046] In the first possible example, the second generator A1121 is used to generate the third refrigerant vapor and the fourth solution, the fourth solution can be a concentrated solution, and the solution index of the fourth solution is higher than that of the third solution; wherein the second absorber A1118 is connected to the second solution exchanger A1128 through the second solution pump A1127, and the second solution exchanger A1128 is also connected to the second generator liquid distribution device A1123, which is used to transport the third solution to the second generator A1121 to generate the third refrigerant vapor and the fourth solution. Specifically, the second generator liquid distribution device A1123 can spray the third solution to the second generator heat transfer tube bundle A1122, and under the action of the medium-temperature heat source in the second generator heat transfer tube bundle A1122, the third refrigerant vapor and the fourth solution can be generated in the second generator A1121. The second generator A1121 can also be connected to the second absorber liquid distribution device A1120 through the second solution exchanger A1128, and is used to transport the fourth solution to the second absorber to generate the third solution, wherein the second absorber liquid distribution device A1120 can spray the fourth solution to the second absorber heat transfer tube bundle A1119, and under the action of the low-temperature heat source in the second absorber heat transfer tube bundle A1119, the fourth solution absorbs the refrigerant vapor from the second evaporator A1126 to form the third solution. Thus, the aforementioned fourth liquid channel can be formed between the second absorber A1118 and the second generator A1121.

[0047] In this first possible example, the second condenser A1124 may include a second condenser heat transfer tube bundle A1125 (also including the inner cavity of the second condenser A1124, etc.), and the second condenser heat transfer tube bundle A1125 is connected to the second absorber heat transfer tube bundle A1119 for transporting the second heat source; the second condenser is used to generate a second refrigerant liquid through the third refrigerant vapor; the third refrigerant vapor can be transported through the fourth steam channel between the second generator A1121 and the second condenser A1124.

[0048] The second evaporator A1126 may only include a second evaporator inner cavity; the second evaporator inner cavity may be connected to the second condenser A1124 via a pipeline A1129 to form a third liquid channel between the second condenser A1124 and the second evaporator A1126, and the second evaporator inner cavity is also connected to the common heat transfer tube bundle A1004, wherein the second evaporator inner cavity is connected to the common heat transfer tube bundle A1004 tube, and is used to evaporate the second refrigerant liquid in the common heat transfer tube bundle A1004 tube (space) to produce The fourth refrigerant vapor is generated, and the first refrigerant liquid is generated through the first refrigerant vapor on the outside (surface) of the common heat transfer tube bundle A1004 and in the first condenser A1106, thereby realizing a common heat exchange surface between the first heat pump A1001 and the second heat pump A1003, and the fourth refrigerant vapor can enter the second absorber A1118 through the third steam channel between the second evaporator A1126 and the second absorber A1118, and the fourth refrigerant vapor is absorbed by the fourth solution in the second absorber A1118 to generate the third solution. The aforementioned third steam channel and fourth steam channel can be realized by setting any liquid blocking device between devices to pass steam / gas and block liquid.

[0049] For example, a third liquid blocking device is provided between the second generator A1121 and the second condenser A1124, and the inner cavity of the second generator A1121 is communicated with the inner cavity of the second condenser A1124 through the third liquid blocking device. A fourth liquid blocking device is provided between the second evaporator A1126 and the second absorber A1118, and the inner cavity of the second evaporator A1126 is communicated with the inner cavity of the second absorber A1118 through the fourth liquid blocking device, so that steam passes through but liquid does not. The third partition plate A1130 between the second generator A1121 and the second condenser A1124 corresponds to the third liquid blocking device, and the fourth partition plate A1131 between the second evaporator A1126 and the second absorber A1118 corresponds to the fourth liquid blocking device, while the third liquid blocking device and the fourth liquid blocking device are not provided. Figure 2 Shown in.

[0050] In the above example, it should be noted that, except for the refrigerant pump A1117, the first solution pump A1116 and the second solution pump A1127, the solution and steam in the second type heat pump unit are all circulated naturally, and a large number of internal circulation pumps are not required, which has the characteristics of green energy saving; Figure 2The tubes in the middle dotted line tube bundle can contain refrigerants, solutions and other working fluids of non-class II heat pump units, and the tubes in the solid line tube bundle can contain refrigerants, solutions and other working fluids of class II heat pump units. The inlet and outlet of the first absorber heat transfer tube bundle A1101 and the shell of the steam-water separator (production device A1002) can be connected, and the placement height of the steam-water separator can be higher than the placement height of the first absorber A1100. In order to adapt to the characteristics of the actual scene, the first evaporator heat transfer tube bundle A1108 can independently circulate the first heat source. The first heat source circulated through the first evaporator heat transfer tube bundle A1108 is cooled / controlled at the designated site location, and then transported to the first generator heat transfer tube bundle A1104 for independent circulation. The second absorber heat transfer tube bundle A1119 can independently circulate the second heat source. The second heat source circulated through the second absorber heat transfer tube bundle A1119 is cooled / controlled at the designated site location, and then transported to the second condenser heat transfer tube bundle A1125 for independent circulation.

[0051] The water flows between the steam-water separator and the first absorber A1100 (high-temperature absorber) in a natural circulation manner. The hot water in the first absorber heat transfer tube bundle A1101 absorbs the heat released by the solution outside the first absorber A1100 tube and becomes a gas-liquid two-phase state, and enters the steam-water separator to separate the high-temperature steam. The generated high-temperature steam is supplied to the production / user through the steam outlet of the steam-water separator. The separated hot water descends and continues to enter the first absorber heat transfer tube bundle A1101 to absorb heat. The hot water circulates naturally using the height difference and density difference, which saves the power consumption of the circulation pump and avoids the vibration that may be caused by the process of high-temperature hot water entering the flash tank. It can be understood that in some possible application scenarios, when the height of the equipment is limited, the driving force of the working fluid in the first absorber heat transfer tube bundle A1101 can also be applied by the circulation pump.

[0052] The medium-temperature heat source (first heat source) can be divided into two parts, one part enters the first evaporator heat transfer tube bundle A1108 and the first generator heat transfer tube bundle A1104 in sequence for cooling, and the other part enters the second generator heat transfer tube bundle A1122 for cooling. After cooling, the two parts of the medium-temperature heat source are mixed and flow out to the system providing the heat source. The low-temperature heat source (second heat source) can enter the second absorber heat transfer tube bundle A1119 and the second condenser heat transfer tube bundle A1125 in series for heating. After the temperature is increased, the low-temperature heat source enters the cooling tower or other heat exchange device for heat dissipation, and after cooling, it returns to the second heat pump for recycling. In addition, the low-temperature heat source (second heat source) can enter the second absorber heat transfer tube bundle A1119 and the second condenser heat transfer tube bundle A1125 in parallel for heating. After the temperature is increased, the low-temperature heat source enters the cooling tower or other heat exchange device for heat dissipation, and after cooling, it returns to the second heat pump for recycling.

[0053] In the embodiment of the present specification, two independent working fluid cycles may be included. In the working fluid cycle A1006, the solution in the second absorber A1118 absorbs the refrigerant vapor from the second evaporator A1126 to form a dilute solution. Under the action of the second solution pump A1127, the dilute solution passes through the second solution exchanger A1128 and exchanges heat with the concentrated solution on the high temperature side, and then enters the second generator liquid distribution device A1123. The dilute solution entering the second generator A1121 is heated by the medium temperature heat source in the second generator heat transfer tube bundle A1122. The heated dilute solution generates corresponding refrigerant vapor and concentrated solution. The corresponding refrigerant vapor enters the second condenser A1124, and the formed concentrated solution exchanges heat with the dilute solution on the low temperature side through the second solution exchanger A1128. The concentrated solution after cooling enters the second absorber liquid distribution device A1120, and absorbs the refrigerant vapor from the second evaporator A1126 again in the second absorber A1118 to form a dilute solution, completing a complete solution cycle.

[0054] In the working fluid cycle A1005, the solution in the first generator A1103 is heated by the medium-temperature heat source in the first generator heat transfer tube bundle A1104, and the heated dilute solution generates refrigerant vapor and concentrated solution. The refrigerant vapor enters the first condenser A1106, and the formed concentrated solution, under the action of the first solution pump A1116, exchanges heat with the dilute solution on the high-temperature side through the first solution exchanger A1115, and the heated concentrated solution enters the first absorber liquid distribution device A1102, absorbs the refrigerant vapor from the first evaporator A1107 in the first absorber A1100 to form a dilute solution, and the dilute solution exchanges heat with the concentrated solution on the low-temperature side through the first solution exchanger A1116 and enters the first generator liquid distribution device A1105, and is generated again to form a concentrated solution under the action of the medium-temperature heat source in the first generator heat transfer tube bundle A1104, thereby completing another solution cycle.

[0055] It should be noted that the first condenser A1106 and the second evaporator A1126 share a heat exchange surface, the refrigerant vapor from the second generator A1121 condenses in the second condenser A1124, the refrigerant water formed by the condensation enters the second evaporator A1126, and then enters the shared heat transfer tube bundle A1004 to absorb heat and evaporate, the refrigerant vapor formed by evaporation enters the second absorber A1118 and is absorbed by the solution; and the refrigerant vapor from the first generator A1103 enters the first condenser A1106, condenses and releases heat under the action of the refrigerant water in the shared heat transfer tube bundle A1004, and the refrigerant water formed by the condensation outside the tube enters the first evaporator liquid distribution device A1109 under the action of the refrigerant pump A1117, evaporates to form refrigerant vapor under the action of the medium-temperature heat source in the first evaporator heat transfer tube bundle A1108, and enters the first absorber A1100.

[0056] In the second possible example, based on the first possible example, the first heat pump and the second heat pump may be non-integrated or may be separated. The second heat pump may not use the second evaporator, but may function as the second evaporator by sharing the inner cavity of the heat transfer tube bundle. Figure 3 , the first heat pump A2001 (dotted line frame, belonging to the second type of heat pump) can still include a first absorber A2100, a first generator A2103, a first condenser A2106 and a first evaporator A2107. The first absorber A2100 can be connected to the production device A2002, and the production device A2002 can still be provided with a high-temperature hot steam output terminal A2110, a water replenishment port A2111 and a sewage outlet A2112. The first absorber A2100 can be connected to the first generator A2103 through a first solution exchanger A2115. The first generator A2103 can also be connected to the first solution exchanger A2115 through a first solution pump A2116, and the first solution exchanger A2115 can also be connected to the first absorber A2100.

[0057] In the second possible example, the common heat transfer tube bundle A2004 is provided in the first condenser A2106, and the first condenser A2106 is connected to the first evaporator A2107 through the refrigerant pump A2117. The first absorber A2100 and the first evaporator A2107 can be integrated into the first part structure of the first heat pump A2001, and the first absorber A2100 and the first evaporator A2107 can share a shell; the inner cavity of the first absorber A2100 can be connected to the inner cavity of the first evaporator A2107 through the first liquid retaining device. The first generator A2103 and the first condenser A2106 can be integrated into the second part structure of the first heat pump A2001, and the first generator A2103 and the first condenser A2106 can share a shell; the inner cavity of the first generator A2103 can be connected to the inner cavity of the first condenser A2106 through the second liquid retaining device. The second part structure of the first heat pump A2001 and the first part structure are two separate shell structures and are not integrated into one. Figure 3 In the schematic diagram of the cross-sectional structure principle, the first partition A2113 located between the first evaporator A2107 and the first absorber A2100 corresponds to the first liquid retaining device, and the second partition A2114 located between the first generator A2103 and the first condenser A2106 corresponds to the second liquid retaining device, while the first liquid retaining device and the second liquid retaining device are not shown.

[0058] In the second possible example, the first absorber A2100 may include a first absorber heat transfer tube bundle A2101 and a first absorber liquid distribution device A2102 for distributing liquid in the first absorber heat transfer tube bundle A2101. The first generator A2103 may include a first generator heat transfer tube bundle A2104 and a first generator liquid distribution device A2105 for distributing liquid in the first generator heat transfer tube bundle A2104. The first evaporator A2107 may include a first evaporator heat transfer tube bundle A2108 and a first evaporator liquid distribution device A2109 for distributing liquid in the first evaporator heat transfer tube bundle A2108. Among them, the specific connection mode and working mode of the components inside the first heat pump A2001 can be implemented correspondingly with reference to the specific connection mode and working mode of the components inside the first heat pump A1001 in the first possible example, and will not be described separately.

[0059] In the second possible example, the second heat pump A2003 (dotted line frame, belonging to a type of heat pump) may include a second absorber A2118, a second generator A2121, and a second condenser A2124, but may not include a second evaporator, or may be considered to include a second evaporator, and the second evaporator may be the space inside the tube of the shared heat transfer tube bundle A2004. The second absorber A2118 may be connected to the second solution exchanger A2128 through a second solution pump A2127, and the second solution exchanger A2128 may also be connected to the second generator A2121. The second generator A2121 may also be connected to the second absorber A2118 through a second solution exchanger A2128.

[0060] In the second possible example, the second condenser A2124 can be connected to the input end of the common heat transfer tube bundle A2004 through the pipeline A2129, and the output end of the common heat transfer tube bundle A2004 can be connected to the second absorber A2118, wherein the inner cavity of the second condenser A2124 can be connected to the inner space of the common heat transfer tube bundle A2004 tube through the pipeline A2129, and the inner space of the common heat transfer tube bundle A2004 tube can also be connected to the inner cavity of the second absorber A2118. The inner cavity of the second condenser A2124 can also be connected to the inner cavity of the second generator A2121 through the third liquid retaining device. The second condenser A2124 and the second generator A2121 can be integrated into the first part of the structure of the second heat pump A2003, and the second condenser A2124 and the second generator A2121 can share a shell. The second absorber A2118 can be placed in the second part of the second heat pump A2003, using a separate shell, so that the second heat pump A2003 can also be a split shell structure. The third partition A2130 between the second generator A2121 and the second condenser A2124 corresponds to the third liquid retaining device, and the third liquid retaining device is not in the Figure 2 Shown in.

[0061] In this second possible example, the second absorber A2118 may include a second absorber heat transfer tube bundle A2119 and a second absorber liquid distribution device A2120 for distributing liquid in the second absorber heat transfer tube bundle A2119. The second generator A2121 may include a second generator heat transfer tube bundle A2122 and a second generator liquid distribution device A2123 for distributing liquid in the second generator heat transfer tube bundle A2122. The second condenser A2124 may include a second condenser heat transfer tube bundle A2125 (also including an inner cavity). Among them, the specific connection mode and working mode of the components inside the second heat pump A2003 can be implemented in accordance with the specific connection mode and working mode of the components inside the second heat pump A1003 in the first possible example, and will not be described separately. Compared with the first possible example, in addition to reducing the second evaporator heat transfer tube bundle, the second possible example of the second type heat pump unit can also support the reduction of the equipment cost of a second evaporator.

[0062] Compared with the first possible example, the second evaporator is omitted, or the second evaporator and the first condenser A2106 can be considered as one (the second evaporator is considered as the space inside the tube of the common heat transfer tube bundle A2004 in the first condenser A2106 at this time), and the refrigerant water from the second condenser A2124 can directly enter the common heat transfer tube bundle A2004, absorb and evaporate in the common heat transfer tube bundle A2004, and the formed refrigerant vapor enters the second absorber A2118 and is absorbed by the concentrated solution entering the second absorber A2118. The refrigerant vapor from the first generator A2103 enters the first condenser A2106 for condensation, and the heat released by condensation is absorbed by the refrigerant water from the second condenser A2124 in the common heat transfer tube bundle A2004. The refrigerant water formed by condensation enters the first evaporator liquid distribution device A2109 under the action of the refrigerant pump A2117, and evaporates under the action of the medium-temperature heat source in the first evaporator heat transfer tube bundle A2108.

[0063] The second heat pump can achieve a temperature difference in the second heat pump by transporting the first heat source and the second heat source with different heat source indicators, and provide the ability and driving energy basis of the heat pump heat exchange process, support the natural circulation of the working fluid in the components without circulating power, so that the compressor is not required and the use of power consumption components such as power pumps is reduced. The working fluid in the shared heat transfer tube bundle is part of the circulating working fluid of a heat pump, and heat exchange occurs between different heat pumps. It is possible to merge a heat exchange process of the second heat pump and a heat exchange process of the first heat pump on the same shared heat exchange surface, so that the heat exchange of the circulating working fluids of different heat pumps inside and outside the tube has a more efficient energy utilization rate, rather than connecting and separately setting different heat pump heat exchange structures in the first heat pump and the second heat pump. Without using a compressor, a more significant temperature difference can be achieved compared to using the first heat source alone in the first heat pump for natural heat exchange. The first heat pump also supports the formation of natural circulation of working fluid in components without circulating power, can support the production of more high-grade steam, and more efficiently apply the first heat source to the production device. At the same time, it can reduce the use of at least one set of heat transfer tube bundles and the use of power pumps in the first heat pump and the second heat pump. On this basis, the first heat pump and the second heat pump do not need to use a multi-stage structure of two or more stages, the number of working fluid conversions is small, and the heat source utilization rate is improved. In addition, the second type of heat pump unit composed of the first heat pump and the second heat pump also supports a non-two-stage structure (reducing one set of heat transfer tube bundles) structure, which reduces equipment costs.

[0064] The present specification also provides a second type of heat pump unit, please refer to Figure 4 , and combined with Figure 1 The second type of heat pump unit B1000 may include:

[0065] The first heat pump B1001 is provided with a heat transfer tube bundle for conveying the first heat source. The heat transfer tube bundle of the first heat pump B1001 can be connected to the first heat source, and further can be connected to the inflow end MI and the outflow end MO of the first heat source; the first heat pump B1001 is used to connect to the production device B1002;

[0066] The second heat pump B1003 is provided with a heat transfer tube bundle for transporting the first heat source and the second heat source. The heat transfer tube bundle of the second heat pump B1003 can be connected to the first heat source and also to the second heat source, and further can be connected to the inflow end MI and the outflow end MO of the first heat source and also to the inflow end LI and the outflow end LO of the second heat source; the heat source index of the first heat source is higher than the heat source index of the second heat source;

[0067] The common heat transfer tube bundle B1004 is connected to the inner cavity of one of the first heat pump B1001 and the second heat pump B1003, and the common heat transfer tube bundle B1004 is arranged in the inner cavity of the other of the first heat pump B1001 and the second heat pump B1003; the first heat pump B1001 is connected to the second heat pump B1003 through the common heat transfer tube bundle B1004, or the second heat pump B1003 is connected to the first heat pump B1001 through the common heat transfer tube bundle B1004, wherein the common heat transfer tube bundle A1004 is used to transport the circulating working fluid of one of the first heat pump B1001 and the second heat pump B1003 ( Figure 4 The one heat pump may be the first heat pump B1001), and the common heat transfer tube bundle is also used to transfer the circulating working fluid of the one heat pump to the other heat pump ( Figure 4 The other heat pump may be a second heat pump B1003) for circulating working medium heat exchange;

[0068] The heat transfer tube bundle of the first heat pump B1001 and the common heat transfer tube bundle B1004 are used to drive the working fluid cycle B1005 of the first heat pump B1001; the heat transfer tube bundle of the second heat pump B1003 and the common heat transfer tube bundle B1004 are used to drive the working fluid cycle B1006 of the second heat pump B1003.

[0069] In the embodiments of this specification, the first heat pump B1001 can be regarded as a type II heat pump, and the second heat pump B1003 can be regarded as a type I heat pump. The first heat pump B1001 and the second heat pump B1003 can exchange heat through a common heat transfer tube bundle B1004.

[0070] In some possible implementations, the common heat transfer tube bundle B1004 (i.e., the space inside the tube) is connected to the inner cavity of the first heat pump B1001, and the common heat transfer tube B1004 (i.e., the tube body) is arranged in the inner cavity of the second heat pump B1003 (i.e., the outer space of the common heat transfer tube B1004 is the inner cavity space of the second heat pump B1003). The tube body of the common heat transfer tube B1004 can be completely arranged in the inner cavity of the second heat pump B1003 (the first heat pump and the second heat pump can have an integrated shell). With respect to the aforementioned embodiment, the common heat transfer tube bundle B1004 can be arranged in the second heat pump B1003; the second type of heat pump unit can also include a first solution exchanger B1115, a first solution pump B1116, and a first refrigerant pump B1117.

[0071] In the third possible example, see Figure 5 , and combined with Figure 2The first heat pump B1001 includes: a first absorber B1100, a first generator B1103, a first condenser B1106 and a first evaporator B1107. Compared with the above embodiment, the first condenser B1106 is not provided with a common heat transfer tube bundle B1004. The first absorber B1100, the first generator B1103, the first condenser B1106 and the first evaporator B1107 can be arranged in the same heat pump housing.

[0072] In the third possible example, the first absorber B1100 may include a first absorber heat transfer tube bundle B1101 and a first absorber liquid distribution device B1102 for distributing liquid in the first absorber heat transfer tube bundle B1101. The first generator B1103 may include a first generator heat transfer tube bundle B1104 and a first generator liquid distribution device B1105 for distributing liquid in the first generator heat transfer tube bundle B1104. The first evaporator B1107 may include a first evaporator heat transfer tube bundle B1108 and a first evaporator liquid distribution device B1109 for distributing liquid in the first evaporator heat transfer tube bundle B1108.

[0073] In the third possible example, the first absorber heat transfer tube bundle B1101 can be connected to the production device B1002, and the production device B1002 can have a steam outlet B1110 for production, and can have a water replenishment port B1111 and a sewage outlet B1112 for equipment operations such as sewage discharge and water replenishment. The first absorber B1100 can be connected to the first generator liquid distribution device B1105 through the first solution exchanger B1115. The first generator B1103 can be connected to the first solution exchanger B1115 through the first solution pump B1116, and the first solution exchanger B1115 can also be connected to the first absorber liquid distribution device B1102.

[0074] In this third possible example, the first condenser B1106 can be connected to the first evaporator liquid distribution device B1109 through the first refrigerant pump B1117. The first evaporator heat transfer tube bundle B1108 can be connected to the first generator heat transfer tube bundle B1104, wherein the first evaporator heat transfer tube bundle B1108 is connected to the inflow end MI of the first heat source, and the first generator heat transfer tube bundle B1104 is connected to the outflow end MO of the first heat source, so that the first heat source passes through the first evaporator B1107 and the first generator B1103 in sequence. The inner cavity of the first evaporator B1107 is connected to the inner cavity of the first absorber B1100 through the first liquid blocking device, and the inner cavity of the first generator B1103 is connected to the inner cavity of the first condenser B1106 through the second liquid blocking device. The working mode of the components of the first heat pump B1001 can be implemented corresponding to the working mode of the components of the first heat pump in the aforementioned embodiment, and will not be described separately. Figure 5In the schematic diagram of the cross-sectional structure principle, the first partition plate B1113 located between the first evaporator B1107 and the first absorber B1100 corresponds to the first liquid blocking device, and the second partition plate B1114 located between the first generator B1103 and the first condenser B1106 corresponds to the second liquid blocking device. The first liquid blocking device and the second liquid blocking device are not shown, and the liquid blocking method can be designed and selected according to actual needs.

[0075] In this third possible example, please continue to refer to Figure 5 , and combined with Figure 2 , the second heat pump B1003 may include a second absorber B1118, a second generator B1121, a second condenser B1124 and a second evaporator B1126. Compared with the above embodiment, the second evaporator B1126 is provided with a common heat transfer tube bundle B1004. The second type of heat pump unit may also include a second solution pump B1127, a second solution exchanger B1128 and a second refrigerant pump B1132. The second absorber B1118, the second generator B1121, the second condenser B1124 and the second evaporator B1126 may be arranged in the same heat pump housing.

[0076] In the third possible example, the second absorber B1118 may include a second absorber heat transfer tube bundle B1119 and a second absorber liquid distribution device B1120 for distributing liquid in the second absorber heat transfer tube bundle B1119. The second generator B1121 may include a second generator heat transfer tube bundle B1122 and a second generator liquid distribution device B1123 for distributing liquid in the second generator heat transfer tube bundle B1122. The second condenser B1124 may include a second condenser heat transfer tube bundle B1125 and an inner cavity. The common heat transfer tube bundle B1004 may be disposed in the second evaporator B1126, and the second evaporator B1126 may further include a second evaporator liquid distribution device B1133 for distributing liquid in the common heat transfer tube bundle B1004.

[0077] In the third possible example, the second absorber heat transfer tube bundle B1119 can be connected to the second condenser heat transfer tube bundle B1125, wherein the second absorber heat transfer tube bundle B1119 can be connected to the inflow end LI of the second heat source, and the second condenser heat transfer tube bundle B1125 can be connected to the outflow end LO of the second heat source, so that the second heat source passes through the second absorber B1118 and the second condenser B1124 in sequence. The inner cavity of the second condenser B1124 is connected to the inner cavity of the second generator B1121 through the third liquid retaining device, and the inner cavity of the second absorber B1118 is connected to the inner cavity of the second evaporator B1126 through the fourth liquid retaining device. The second condenser B1124 is connected to the second evaporator B1126 through the pipeline B1129. The working mode of the components of the second heat pump B1003 can be implemented in accordance with the working mode of the components of the second heat pump in the aforementioned embodiment, and will not be described separately. Among them, the second evaporator liquid distribution device B1133 in the second evaporator B1126 can spray the refrigerant liquid that has not been completely evaporated in the second evaporator B1126 to the shared heat transfer tube bundle B1004. The evaporation process is carried out in the inner cavity of the second evaporator B1126, and the condensation process of the first condenser B1106 is carried out in the shared heat transfer tube bundle B1004, thereby realizing a shared heat exchange surface between the first heat pump B1001 and the second heat pump B1003. The third partition plate B1130 between the second generator B1121 and the second condenser B1124 corresponds to the third liquid retaining device, and the fourth partition plate B1131 between the second evaporator B1126 and the second absorber B1118 corresponds to the fourth liquid retaining device, and the third liquid retaining device and the fourth liquid retaining device are not in Figure 5 Shown in.

[0078] Compared with the first possible embodiment, the common heat transfer tube bundle B1004 is arranged in the second evaporator B1126, and heat is exchanged by condensing inside the tube and evaporating outside the tube. The refrigerant vapor from the first generator B1103 enters the first condenser B1106, and then enters the common heat transfer tube bundle B1004, condenses and releases heat in the common heat transfer tube bundle B1004, forms refrigerant water and returns to the first condenser B1106, enters the first evaporator liquid distribution device B1109 under the action of the first refrigerant pump B1117, and evaporates under the action of the medium-temperature heat source in the first evaporator heat transfer tube bundle B1108. The refrigerant water from the second condenser B1124 enters the second evaporator B1126, absorbs the heat released by the condensation of the refrigerant steam from the first condenser B1106 in the shared heat transfer tube bundle B1004, and then evaporates. The formed refrigerant steam enters the second absorber B1118 and is absorbed by the concentrated solution entering the second absorber B1118; and the refrigerant water that has not been completely evaporated in the second evaporator B1126 enters the second evaporator liquid distribution device B1133 under the action of the second refrigerant pump (104), forming a self-circulation in the second evaporator B1126.

[0079] In some possible implementations, based on the third possible example, the first heat pump and the second heat pump in the second type heat pump unit may use the first heat source in series in addition to using the first heat source in parallel in the above embodiment; the second type heat pump unit may also be a split structure; the first heat pump may not be provided with a first condenser, or may be provided with a first condenser, and the space inside the shared heat transfer tube bundle may be regarded as the first condenser.

[0080] In the fourth possible example, see Figure 6 , and combined with Figure 3 In the second type heat pump unit B2000, the first heat pump B2001 may include: a first absorber B2100, a first generator B2103 and a first evaporator B2107. The first heat pump B2001 may not include a first condenser, or may include a first condenser and regard the first condenser as the inner tube space ( / inner tube structure) of the common heat transfer tube bundle B2004. The first absorber B2100 and the first evaporator B2107 may share a shell, and the first generator B2103 may use another shell alone.

[0081] In the fourth possible example, the first absorber B2100 may include a first absorber heat transfer tube bundle B2101 and a first absorber liquid distribution device B2102 for distributing liquid in the first absorber heat transfer tube bundle B2101. The first generator B2103 may include a first generator heat transfer tube bundle B2104 and a first generator liquid distribution device B2105 for distributing liquid in the first generator heat transfer tube bundle B2104. The first evaporator B2107 may include a first evaporator heat transfer tube bundle B2108 and a first evaporator liquid distribution device B2109 for distributing liquid in the first evaporator heat transfer tube bundle B2108.

[0082] In the fourth possible example, the first absorber heat transfer tube bundle B2101 can be connected to the production device B2002, which can have a steam outlet B2110 for production, and can have a water replenishment port B2111 and a sewage outlet B2112 for equipment maintenance operations such as sewage discharge and water replenishment. The first absorber B2100 can be connected to the first generator liquid distribution device B2105 through the first solution exchanger B2115. The first generator B2103 can be connected to the first solution exchanger B2115 through the first solution pump B2116, and the first solution exchanger B2115 can also be connected to the first absorber liquid distribution device B2102.

[0083] In this fourth possible example, the first generator B2103 can be connected to the common heat transfer tube bundle B2004, wherein the inner cavity of the first generator B2103 can be connected to the inner space of the common heat transfer tube bundle B2004, and the common heat transfer tube bundle B2004 can also be connected to the first evaporator liquid distribution device B2109 through the first refrigerant pump B2117. The first evaporator heat transfer tube bundle B2108 can be connected to the first generator heat transfer tube bundle B2104, wherein the first evaporator heat transfer tube bundle B2108 is connected to the inflow end MI of the first heat source, the first generator heat transfer tube bundle B2104 is connected to the second generator heat transfer tube bundle B2122 in the second generator B2121 in the second heat pump B2003, and the second generator heat transfer tube bundle B2122 is also connected to the outflow end MO of the first heat source, so that the first heat source passes through the first evaporator B2107, the first generator B2103 and the second generator B2121 in sequence. The inner cavity of the first evaporator B2107 is connected to the inner cavity of the first absorber B2100 through the first liquid retaining device. Figure 6 In the schematic diagram of the cross-sectional structure principle, the first partition B2113 located between the first evaporator B2107 and the first absorber B2100 corresponds to the first liquid blocking device.

[0084] In this fourth possible example, please continue to refer to Figure 6 , and combined with Figure 3 , the second heat pump B2003 may include a second absorber B2118, a second generator B2121, a second condenser B2124 and a second evaporator B2126. Compared with the above embodiment, the second evaporator B2126 is provided with a common heat transfer tube bundle B2004. The second type heat pump unit B2000 may also include a second solution pump B2127, a second solution exchanger B2128 and a second refrigerant pump B2132. The second absorber B2118 and the second evaporator B2126 may be arranged in one heat pump housing, and the second generator B2121 and the second condenser B2124 may be arranged in another heat pump housing.

[0085] In the fourth possible example, the second absorber B2118 may include a second absorber heat transfer tube bundle B2119 and a second absorber liquid distribution device B2120 for distributing liquid in the second absorber heat transfer tube bundle B2119. The second generator B2121 may include a second generator heat transfer tube bundle B2122 and a second generator liquid distribution device B2123 for distributing liquid in the second generator heat transfer tube bundle B2122. The second condenser B2124 may include a second condenser heat transfer tube bundle B2125 and an inner cavity. The common heat transfer tube bundle B2004 may be disposed in the second evaporator B2126, and the second evaporator B2126 may further include a second evaporator liquid distribution device B2133 for distributing liquid in the common heat transfer tube bundle B2004.

[0086] In this fourth possible example, the second absorber heat transfer tube bundle B2119 can be connected to the second condenser heat transfer tube bundle B2125, wherein the second condenser heat transfer tube bundle B2125 can be connected to the inflow end LI of the second heat source, and the second absorber heat transfer tube bundle B2119 can be connected to the outflow end LO of the second heat source so that the second heat source passes through the second condenser B2124 and the second absorber B2118 in sequence. The inner cavity of the second condenser B2124 is connected to the inner cavity of the second generator B2121 through the third liquid retaining device, and the inner cavity of the second absorber B2118 is connected to the inner cavity of the second evaporator B2126 through the fourth liquid retaining device. The second condenser B2124 is connected to the second evaporator B2126 through the pipeline B2129. The working mode of the components of the second heat pump B2003 can be implemented corresponding to the working mode of the components of the second heat pump in the aforementioned embodiment, and will not be described separately. The evaporation process is carried out in the inner cavity of the second evaporator B2126, and the condensation process of the corresponding refrigerant vapor output by the first condenser or the first generator B2103 is carried out in the shared heat transfer tube bundle B2004, thereby realizing a shared heat exchange surface between the first heat pump B2001 and the second heat pump B2003. At this time, the equipment cost of the first condenser can be reduced. The third partition plate B2130 between the second generator B2121 and the second condenser B2124 corresponds to the third liquid retaining device, and the fourth partition plate B2131 between the second evaporator B2126 and the second absorber B2118 corresponds to the fourth liquid retaining device, while the third liquid retaining device and the fourth liquid retaining device are not in Figure 6 Shown in.

[0087] Compared with the third possible example, the first condenser is omitted, and the second evaporator B2126 and the first condenser can be regarded as integrated into one (the first condenser can be regarded as the space inside the tube of the common heat transfer tube bundle B2004 in the second evaporator B2126). The refrigerant vapor from the first generator B2103 can directly enter the common heat transfer tube bundle B2004 for condensation, and the formed refrigerant water enters the first evaporator liquid distribution device B2109 under the action of the first refrigerant pump B2117, and evaporates under the action of the medium-temperature heat source in the first evaporator heat transfer tube bundle B2108. The refrigerant water from the second condenser B2124 enters the second evaporator B2126, absorbs the heat released by the condensation of the refrigerant steam from the first generator B2103 in the shared heat transfer tube bundle B2004, and evaporates. The refrigerant steam formed by evaporation enters the second absorber B2118 and is absorbed by the concentrated solution entering the second absorber B2118; and the refrigerant water that has not been completely evaporated in the second evaporator B2126 enters the second evaporator liquid distribution device B2133 under the action of the second refrigerant pump B2132, forming a self-circulation in the second evaporator B2126. The medium-temperature heat source is connected in series and sequentially enters the first evaporator heat transfer tube bundle B2108, the first generator heat transfer tube bundle B2104 for cooling, and the second generator heat transfer tube bundle B2122 for cooling. After cooling, the medium-temperature heat source flows out and returns to the system. The low-temperature heat source is connected in series and enters the second condenser heat transfer tube bundle B2125 and the second absorber heat transfer tube bundle B2119 in sequence for heating. The heated low-temperature heat source enters the cooling tower or other heat exchange device for heat dissipation, and returns to the heat pump for recycling after cooling.

[0088] Traditional Class II heat pumps for medium-temperature heat sources with low temperatures need to be designed into two stages in order to produce sufficiently high-quality steam. The energy efficiency is low, and both stages are heat transfer tube structures, which are costly. At the same time, the internal circulation between the absorber and the evaporator often requires a power pump to maintain the circulation of the medium in the tube. The power consumption of the circulation pump is high. In addition, the temperature of the hot water is already high after leaving the low-temperature absorber, and the flow is unstable. It is very easy to produce bubble bursting and vibration during the process of being transported to the high-temperature evaporator. In the embodiment of this specification, a class I heat pump and a class II heat pump are combined, and the medium-temperature heat source is used as the high-temperature heat source of the class I heat pump (the second heat pump) to drive the class I heat pump, and at the same time as the medium-temperature heat source of the class II heat pump (the first heat pump). The low-temperature heat source is used as the cooling water of the class I heat pump. The evaporator of the class I heat pump is combined with the condenser of the class II heat pump through a shared heat transfer tube bundle. The shared heat transfer tube bundle can exchange heat by evaporating inside the tube and condensing outside the tube, and can also exchange heat by condensing inside the tube and evaporating outside the tube. The refrigerant water from the class II heat pump condenser absorbs heat and evaporates as the low-temperature heat source of the class I heat pump, so that the refrigerant steam of the class II heat pump generator condenses and releases heat. The evaporator of the class I heat pump and the condenser of the class II heat pump share a heat exchange surface, and the temperature rise amplitude of the preparation of high-quality heat medium is increased by increasing the solution concentration of the high-temperature absorber. Both the first-class heat pump and the second-class heat pump are single-stage and simple in structure. The overall second-class heat pump unit is a non-secondary structure (the evaporator of the first-class heat pump and the condenser of the second-class heat pump share a set of heat transfer tube bundles, which can reduce at least one set of heat transfer tube bundles), which can effectively reduce costs; at the same time, because the energy efficiency of the first-class heat pump is high, it can improve the energy-saving effect of the heat pump and produce more high-quality steam. In addition, it has the characteristics of energy saving and emission reduction, which further reduces the cost of use, and avoids the vibration caused by the flow of hot water, which aggravates the loss and damage of components, and can extend the service life of the equipment.

[0089] One embodiment of this specification provides a chemical plant under the same inventive concept as the above embodiment, which may include: a production device and a heat pump unit connected to the production device, wherein the heat pump unit is any one of the second-class heat pump units in the above embodiment. Figure 7 In the chemical device C1000, the production device C1002 can be a steam-water separation device. A common heat transfer tube bundle C1004 is set between the first heat pump C1001 and the second heat pump C1003 in the second type heat pump unit. The first heat pump C1001 can be driven by the first heat source (inflow end MI / outflow end MO) and the common heat transfer tube bundle C1004, and the second heat pump C1003 can be driven by the first heat source, the second heat source (inflow end LI / outflow end LO) and the common heat transfer tube bundle C1004. In addition, in addition to being a steam-water separation device, the production device C1002 can also be an oil-gas separation device, a heating device, etc. The chemical device C1000 can also include cooling towers, valves, electrical switches and other functional, control / operation components for safety management and process control.

[0090] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0091] In short, the above description is only a preferred embodiment of this specification and is not intended to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0092] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0093] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

Claims

1. A second type heat pump unit, characterized in that: include: A first heat pump is provided with a heat transfer tube bundle for conveying a first heat source; the first heat pump is used to be connected to a production device; A second heat pump is provided with a heat transfer tube bundle for transporting the first heat source and the second heat source; the heat source index of the first heat source is higher than the heat source index of the second heat source; A common heat transfer tube bundle is connected to the inner cavity of one of the first heat pump and the second heat pump, and the common heat transfer tube bundle is arranged in the inner cavity of the other of the first heat pump and the second heat pump; wherein, The heat transfer tube bundle of the first heat pump and the common heat transfer tube bundle are used to drive the working medium circulation of the first heat pump; the heat transfer tube bundle of the second heat pump and the common heat transfer tube bundle are used to drive the working medium circulation of the second heat pump.

2. The second type heat pump unit according to claim 1, characterized in that: The common heat transfer tube bundle is in communication with the inner cavity of the second heat pump, and the common heat transfer tube is disposed in the inner cavity of the first heat pump.

3. The second type heat pump unit according to claim 2, characterized in that: The first heat pump comprises: a first absorber, a first generator, a first condenser and a first evaporator; A first liquid channel is provided between the first condenser and the first evaporator, a first steam channel is provided between the first evaporator and the first absorber, a second liquid channel is provided between the first absorber and the first generator, and a second steam channel is provided between the first generator and the first condenser; The first liquid channel, the first steam channel, the second liquid channel and the second steam channel constitute a circulation channel for circulating the working medium of the first heat pump.

4. The second type heat pump unit according to claim 3, characterized in that: The first heat pump further includes a refrigerant pump for forming the first liquid channel; The common heat transfer tube bundle is arranged in the inner cavity of the first condenser; the first condenser is used to condense the first refrigerant vapor through the common heat transfer tube bundle to generate the first refrigerant liquid; The first evaporator comprises a first evaporator heat transfer tube bundle and a first evaporator liquid distributing device for distributing liquid to the first evaporator heat transfer tube bundle, the first evaporator heat transfer tube bundle is connected to the first generator for transporting the first heat source; the first evaporator is used to generate second refrigerant vapor; The first condenser is connected to the first evaporator liquid distribution device through the refrigerant pump, and is used to transport the first refrigerant liquid to the first evaporator to generate the second refrigerant vapor.

5. The second type heat pump unit according to claim 3, characterized in that: The first heat pump further includes a first solution pump and a first solution exchanger for forming the second liquid channel; The first absorber comprises a first absorber heat transfer tube bundle and a first absorber liquid distributing device for distributing liquid to the first absorber heat transfer tube bundle, wherein the first absorber heat transfer tube bundle is used to transport the working fluid of the production device; the first absorber is used to produce a first solution; The first generator includes a first generator heat transfer tube bundle and a first generator liquid distribution device for distributing liquid to the first generator heat transfer tube bundle; wherein, The first generator is used to generate a first refrigerant vapor and a second solution; the solution index of the second solution is higher than the solution index of the first solution; The first absorber is connected to the first generator liquid distribution device through the first solution exchanger, and is used to transport the first solution to the first generator to produce the second solution; The first generator is also connected to the first solution exchanger through the first solution pump, and the first solution exchanger is also connected to the first absorber liquid distribution device for conveying the second solution to the first absorber to generate the first solution.

6. The second type heat pump unit according to claim 2, characterized in that: The second heat pump comprises: a second absorber, a second generator, a second condenser and a second evaporator; A third liquid channel is provided between the second condenser and the second evaporator, a third steam channel is provided between the second evaporator and the second absorber, a fourth liquid channel is provided between the second absorber and the second generator, and a fourth steam channel is provided between the second generator and the second condenser; The third liquid channel, the third steam channel, the fourth liquid channel and the fourth steam channel constitute a circulation channel for circulating the working medium of the second heat pump.

7. The second type heat pump unit according to claim 6, characterized in that: The second heat pump further comprises a second solution pump and a second solution exchanger for forming the fourth liquid channel; The second absorber comprises a second absorber heat transfer tube bundle and a second absorber liquid distributing device for distributing liquid to the second absorber heat transfer tube bundle, and the second absorber is used to produce a third solution; The second generator includes a second generator heat transfer tube bundle and a second generator liquid distribution device for distributing liquid to the second generator heat transfer tube bundle; the second generator heat transfer tube bundle is used to transport the first heat source; the second generator is used to generate a third refrigerant vapor and a fourth solution, and the solution index of the fourth solution is higher than that of the third solution; wherein, The second absorber is connected to the second solution exchanger through the second solution pump, and the second solution exchanger is also connected to the second generator liquid distribution device for conveying the third solution to the second generator to generate the third refrigerant vapor and the fourth solution; The second generator is connected to the second absorber liquid distribution device through the second solution exchanger, and is used to transport the fourth solution to the second absorber to generate the third solution.

8. The second type heat pump unit according to claim 6, characterized in that: The second condenser is connected to the second evaporator via a pipeline for conveying refrigerant liquid to form the third liquid channel; The second condenser comprises a second condenser heat transfer tube bundle, the second condenser heat transfer tube bundle is connected to the second absorber heat transfer tube bundle, and is used to transport the second heat source; the second condenser is used to generate a second refrigerant liquid through a third refrigerant vapor; The second evaporator includes a second evaporator inner cavity; the second evaporator inner cavity is connected to the second condenser, and the second evaporator inner cavity is also connected to the common heat transfer tube bundle.

9. The second type heat pump unit according to claim 2, characterized in that: The first heat pump comprises: The first heat pump comprises: a first evaporator, a first absorber, a first generator and a first condenser; the second heat pump comprises: a second absorber, a second generator and a second condenser; The common heat transfer tube bundle is disposed in the inner cavity of the first condenser, and the common heat transfer tube bundle is communicated with the inner cavity of the second condenser and also communicated with the inner cavity of the second absorber.

10. The second type heat pump unit according to claim 1, characterized in that: The common heat transfer tube bundle is in communication with the inner cavity of the first heat pump, and the common heat transfer tube bundle is disposed in the inner cavity of the second heat pump.

11. The second type heat pump unit according to claim 10, characterized in that: The first heat pump comprises: a first evaporator, a first absorber, a first generator and a first condenser; the second heat pump comprises: a second evaporator, a second absorber, a second generator and a second condenser; Wherein, the common heat transfer tube bundle is arranged in the inner cavity of the second evaporator; the common heat transfer tube bundle is connected to the inner cavity of the first condenser.

12. The second type heat pump unit according to claim 10, characterized in that: The first heat pump comprises: a first evaporator, a first absorber and a first generator; the second heat pump comprises: a second evaporator, a second absorber, a second generator and a second condenser; Wherein, the common heat transfer tube bundle is arranged in the inner cavity of the second evaporator; the common heat transfer tube bundle is connected with the inner cavity of the first evaporator and also connected with the inner cavity of the first generator.

13. A chemical plant, characterized in that: include: A production device and a heat pump unit connected to the production device, wherein the heat pump unit is a second-class heat pump unit as described in any one of claims 1 to 12.

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