Novel integrated large-temperature-difference absorption heat exchange unit device

Abstract

The utility model belongs to the technical field of central heating, and particularly relates to a novel integrated large-temperature-difference absorption type heat exchange unit device, and media on the two sides of the unit device are high-temperature side water and low-temperature side water respectively. High-temperature-side supplied water sequentially flows through a generator of the large-temperature-difference absorption heat pump, the water-water heat exchanger and an evaporator of the large-temperature-difference absorption heat pump to be fully cooled and then is connected with a high-temperature-side water return pipe through a connecting pipeline and a pipeline accessory, and low-temperature-side returned water is pressurized by a circulating water pump through the connecting pipeline and then is divided into two paths. One path sequentially enters an absorber and a condenser of the large-temperature-difference absorption heat pump to be heated, the other path enters a water-water heat exchanger to exchange heat with high-temperature side water, and the two paths of media are fully mixed after being heated respectively and are connected with low-temperature side water supply through a connecting pipeline and a pipeline accessory. The device is integrated in the same frame, the structure is compact, the occupied area of a station building is small, unit pipe fitting prefabrication is facilitated, the manufacturing and mounting efficiency is improved, and the unit performance is more stable, efficient and energy-saving.

Description

Technical Field

[0001] This utility model belongs to the field of centralized heating technology, specifically relating to a novel integrated large temperature difference absorption heat exchanger unit. Background Technology

[0002] Traditional large temperature difference absorption heat exchanger heating systems typically employ a decentralized layout, with each piece of equipment (such as the large temperature difference absorption heat pump, water-to-water heat exchanger, circulating water pump, makeup water pump, makeup water tank, and electrical control cabinet) installed independently. This presents the following problems:

[0003] (1) Large space occupation: The dispersed layout of equipment leads to an increase in the area occupied, which is especially limiting in urban areas;

[0004] (2) Complex installation: Piping and electrical systems need to be assembled on site, resulting in a long construction period and high costs;

[0005] (3) Significant heat loss: Long-distance pipelines lead to heat loss and reduce system energy efficiency;

[0006] (4) Inconvenient operation and maintenance: The dispersed layout of equipment increases the difficulty of inspection and troubleshooting;

[0007] (5) Excessive overall water resistance: The dispersed arrangement of equipment increases the water resistance of the system and results in excessive energy consumption.

[0008] While existing technologies have made some attempts at integration, they are mostly limited to combinations of local devices and have not achieved a high degree of integration and intelligent control optimization of the entire system. Therefore, there is an urgent need for a compact and fully functional integrated solution. Utility Model Content

[0009] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a highly integrated large temperature difference absorption heat exchanger unit. Through modular design, it eliminates the defects of traditional decentralized layout, while optimizing the thermal cycle and control system to improve energy efficiency and ease of operation and maintenance.

[0010] The purpose of this utility model is achieved as follows: A novel integrated large temperature difference absorption heat exchanger unit includes a large temperature difference absorption heat pump, a water-to-water heat exchanger, a circulating water pump, a makeup water pump, a makeup water tank, connecting pipes, pipe fittings, and a power control cabinet; the generator of the large temperature difference absorption heat pump is connected to the high-temperature side water supply pipe via the connecting pipe; the hot flow inlet of the water-to-water heat exchanger is connected to the generator of the large temperature difference absorption heat pump and the high-temperature side water supply pipe; the hot flow outlet of the water-to-water heat exchanger is connected to the evaporator of the large temperature difference absorption heat pump and the high-temperature side return water pipe; the evaporator of the large temperature difference absorption heat pump is connected to the high-temperature side return water pipe; and the cold flow inlet of the water-to-water heat exchanger... The cold outlet end of the water-to-water heat exchanger is connected to the low-temperature side return water pipe, the cold outlet end of the water-to-water heat exchanger is connected to the low-temperature side supply water pipe, the condenser of the large temperature difference absorption heat pump is connected to the low-temperature side supply water pipe, the absorber of the large temperature difference absorption heat pump is connected to the low-temperature side return water pipe, the circulating water pump is installed on the low-temperature side return water main pipe, and the makeup water tank is connected to the low-temperature side return water pipe through the makeup water pipe and the makeup water pump; the pipeline accessories include valves, heat meters, flow meters, electric regulating valves, etc.; the device is integrated in the same steel structure frame, and the power distribution control cabinet has a built-in PLC controller, which is connected to the large temperature difference absorption heat pump, circulating water pump and makeup water pump, electric regulating valve, flow meter, and heat meter through a standard protocol.

[0011] Furthermore, the bottom of the frame is provided with a shock-absorbing support.

[0012] Furthermore, the water-to-water heat exchanger includes two operating conditions: one condition is for direct heat exchange between the high-temperature side medium and the low-temperature side medium, and the other condition is for heat exchange between the high-temperature side medium, which has been cooled by heat exchange with the large temperature difference absorption heat pump generator, and the low-temperature side heating medium.

[0013] Furthermore, both the circulating water pump and the makeup water pump are variable frequency motors, and their speeds are dynamically adjusted by the PLC controller according to the temperature difference between the supply and return water on the low-temperature side.

[0014] Furthermore, the connecting pipeline is made of carbon steel and is connected by flanges or welding, which reduces local resistance.

[0015] Furthermore, the power distribution control cabinet integrates an Internet of Things (IoT) communication module, supporting remote start / stop, parameter setting, and fault diagnosis functions.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. High integration: Each device is connected through standardized interfaces to form a compact module, reducing the floor space by more than 40%.

[0018] 2. Factory prefabrication: More than 90% of the components are pre-assembled in the factory, and only external pipes and power supply need to be connected on site, which shortens the installation cycle by 60%.

[0019] 3. Intelligent control: Based on load prediction algorithms, the operating parameters of heat pumps and water pumps are adjusted, improving overall energy efficiency by 15%~20%.

[0020] 4. Energy saving and material reduction: Optimized pipeline layout reduces steel consumption by 30%, reduces unit operating resistance, and variable frequency water pumps reduce power consumption by 25%.

[0021] 5. Ease of maintenance: Centralized equipment layout improves operation and maintenance efficiency by 50%. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the system principle of the novel integrated large temperature difference absorption heat exchanger unit of this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the novel integrated large temperature difference absorption heat exchanger unit of this utility model.

[0024] Figure 3 This is a top view schematic diagram of the structure of the novel integrated large temperature difference absorption heat exchanger unit of this utility model.

[0025] In the diagram: 1-Large temperature difference absorption heat pump, 2-Water-to-water heat exchanger, 3-Circulating water pump, 4-Makeup water pump, 5-Makeup water tank, 6-Connecting pipes, 7-Pipe fittings, 8-Electrical control cabinet, 9-Frame. Detailed Implementation

[0026] The novel integrated large temperature difference absorption heat exchanger unit of this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] See Figures 1-3 A novel integrated large temperature difference absorption heat exchanger unit includes the following integrated components:

[0029] Large temperature difference absorption heat pump 1: A device that transfers the heat from the generator heating source (such as industrial waste heat or geothermal heat) and the heat from the heat source absorbed by the evaporator to the absorber and condenser to produce hot water.

[0030] Water-to-water heat exchanger 2: used for direct heat exchange between the high-temperature side medium and the low-temperature side medium, or for the high-temperature side medium to exchange heat with the low-temperature side medium after being cooled by a large temperature difference absorption heat pump.

[0031] Circulating water pump 3 and makeup water pump 4: adopt variable frequency control technology to dynamically adjust the flow rate according to load demand, saving energy and reducing consumption;

[0032] Water supply tank 5 and piping system: integrates water supply device and optimizes piping layout, reduces the number of connecting pipes, elbows and valves and other accessories, and reduces flow resistance;

[0033] Power distribution control cabinet 8: Built-in PLC control system, integrating temperature, pressure and flow sensors to achieve fully automatic operation and remote monitoring;

[0034] Frame 9: It adopts a steel structure base and modular shell, with reserved standardized interfaces to facilitate transportation and quick on-site installation;

[0035] In this system, the generator of the large temperature difference absorption heat pump 1 is connected to the high-temperature side water supply pipe via connecting pipe 6. The hot flow inlet of the water-to-water heat exchanger 2 is connected to the generator of the large temperature difference absorption heat pump 1 and the high-temperature side water supply pipe. The hot flow outlet of the water-to-water heat exchanger 2 is connected to the evaporator of the large temperature difference absorption heat pump 1 and the high-temperature side return water pipe. The evaporator of the large temperature difference absorption heat pump 1 is connected to the high-temperature side return water pipe. The cold flow inlet of the water-to-water heat exchanger 2 is connected to the low-temperature side return water pipe. The cold flow outlet of the water-to-water heat exchanger 2 is connected to the low-temperature side water supply pipe. The condenser of the absorption heat pump 1 is connected to the low-temperature side water supply pipe, and the absorber of the large temperature difference absorption heat pump 1 is connected to the low-temperature side return water pipe. The circulating water pump 3 is installed on the low-temperature side return water main pipe, and the makeup water tank 5 is connected to the low-temperature side return water pipe through the makeup water pipe and the makeup water pump 4. The pipeline accessories 7 include valves, heat meters, flow meters, electric regulating valves, etc. The devices are integrated in the same steel structure frame 9, and the power distribution control cabinet 8 has a built-in PLC controller, which is connected to the large temperature difference absorption heat pump 1, the circulating water pump 3 and the makeup water pump 4, the electric regulating valve, the flow meter and the heat meter through a standard protocol.

[0036] Furthermore, the bottom of the frame 9 is provided with a shock-absorbing support.

[0037] See Figure 1 and Figure 2 The water-to-water heat exchanger 2 includes two operating conditions: one is for direct heat exchange between the high-temperature side medium and the low-temperature side medium, and the other is for heat exchange between the high-temperature side medium and the low-temperature side medium after being cooled by the large temperature difference absorption heat pump 1.

[0038] Furthermore, both the circulating water pump 3 and the makeup water pump 4 are variable frequency motors, and their speeds are dynamically adjusted by the PLC controller according to the temperature difference between the supply and return water on the low-temperature side.

[0039] Furthermore, the connecting pipe 6 is made of carbon steel and is connected by flanges or welding, which reduces local resistance.

[0040] Furthermore, the power distribution control cabinet 8 integrates an Internet of Things (IoT) communication module, supporting remote start / stop, parameter setting, and fault diagnosis functions.

[0041] The working process of this utility model is as follows: Large temperature difference heat exchange condition 1: The high-temperature side supply water sequentially passes through the generator, water-to-water heat exchanger, and evaporator, releasing heat and cooling down step by step; the low-temperature side return water is divided into two paths: one path enters the absorber and condenser for step-by-step heating, and the other path enters the water-to-water heat exchanger for counter-current heat exchange with the high-temperature side supply water. In the process of exchanging heat from the high-temperature side medium to the low-temperature side medium, the absorption heat exchanger unit breaks through the limits of conventional heat exchange devices, making the high-temperature side return water temperature significantly lower than the low-temperature side return water temperature, thereby effectively reducing irreversible heat exchange losses. This not only significantly increases the heat transfer capacity of the high-temperature side by more than 50%, but also creates favorable conditions for the recovery of waste heat from the heat source. Conventional heat exchange condition 2: During maintenance or shutdown of the large temperature difference heat exchanger unit, by shutting off the switching valve, the high-temperature side medium exchanges heat with the low-temperature side medium counter-currently through the water-to-water heat exchanger.

[0042] In this invention, the large temperature difference absorption heat pump 1 adopts a two-stage evaporation / absorption, multi-pass cross-flow dripping absorption heat exchange process, further reducing irreversible heat transfer losses within the unit. By optimizing the internal pipe array structure and dripping device, the problem of liquid distribution under conditions of small solution circulation volume and low pressure loss is solved, improving the heat and mass transfer performance of each component. Under the premise of the same supply and return water parameters on the low-temperature side, the inlet and outlet temperature difference of the high-temperature side water is significantly increased compared with conventional circulation, which can reduce the high-temperature side return water temperature to about 20°C.

[0043] This device integrates and optimizes the existing large temperature difference absorption heat pump 1 with traditional heat exchange units. On the one hand, it makes the unit structure more compact and reduces the land area required for the station building; on the other hand, it facilitates the prefabrication of the unit and improves the efficiency of manufacturing and installation of the new heat exchange unit; furthermore, it increases the production rate of the heat exchange unit, ensures product quality, and improves the performance of the heat pump heat exchange unit system, thereby overcoming the disadvantages of decentralized layout and achieving the goal of making the unit performance more stable, efficient, and energy-saving.

[0044] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The use of terms such as "a" or "an" in this specification and claims does not necessarily indicate a limitation on quantity. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0045] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A novel integrated large temperature difference absorption heat exchanger unit, characterized in that, The system includes a large temperature difference absorption heat pump, a water-to-water heat exchanger, a circulating water pump, a makeup water pump, a makeup water tank, connecting pipes, pipe fittings, and an electrical control cabinet. The generator of the large temperature difference absorption heat pump is connected to the high-temperature side water supply pipe via connecting pipes. The hot flow inlet of the water-to-water heat exchanger is connected to the generator of the large temperature difference absorption heat pump and the high-temperature side water supply pipe. The hot flow outlet of the water-to-water heat exchanger is connected to the evaporator of the large temperature difference absorption heat pump and the high-temperature side return water pipe. The evaporator of the large temperature difference absorption heat pump is connected to the high-temperature side return water pipe. The cold flow inlet of the water-to-water heat exchanger is connected to the low-temperature side return water pipe. The cold outlet of the heat exchanger is connected to the low-temperature side water supply pipe. The condenser of the large temperature difference absorption heat pump is connected to the low-temperature side water supply pipe. The absorber of the large temperature difference absorption heat pump is connected to the low-temperature side return water pipe. The circulating water pump is installed on the low-temperature side return water main pipe. The makeup water tank is connected to the low-temperature side return water pipe through the makeup water pipe and the makeup water pump. The pipeline accessories include valves, heat meters, flow meters, and electric regulating valves. The device is integrated within the same steel structure frame. The power distribution control cabinet has a built-in PLC controller and is connected to the large temperature difference absorption heat pump, circulating water pump and makeup water pump, electric regulating valve, flow meter, and heat meter through a standard protocol.

2. The novel integrated large temperature difference absorption heat exchanger unit according to claim 1, characterized in that, The frame is equipped with shock-absorbing supports at its bottom.

3. The novel integrated large temperature difference absorption heat exchanger unit according to claim 1, characterized in that, The water-to-water heat exchanger includes two operating conditions: one is for direct heat exchange between the high-temperature side medium and the low-temperature side medium, and the other is for heat exchange between the high-temperature side medium, after being cooled by a large temperature difference absorption heat pump, and the low-temperature side heating medium.

4. The novel integrated large temperature difference absorption heat exchanger unit according to claim 1, characterized in that, Both the circulating water pump and the makeup water pump are variable frequency motors, and their speed is dynamically adjusted by the PLC controller according to the temperature difference between the supply and return water on the low-temperature side.

5. The novel integrated large temperature difference absorption heat exchanger unit according to claim 1, characterized in that, The connecting pipes are made of carbon steel and are connected by flanges or welding.

6. The novel integrated large temperature difference absorption heat exchanger unit according to claim 1, characterized in that, The power distribution control cabinet integrates an Internet of Things (IoT) communication module, which supports remote start / stop, parameter setting, and fault diagnosis functions.

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