Water mixing technology lithium bromide absorption type heat exchange system with pressure isolating device
Through the water mixing technology of lithium bromide absorption heat exchange system with pressure isolation device, the problems of high energy consumption and high cost in conventional systems under high temperature demand are solved, and efficient heating quality improvement and cost reduction are achieved.
Patent Information
- Application Number
- CN202422413003.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-08
AI Technical Summary
Conventional lithium bromide absorption heat exchange systems are difficult to meet the needs of heat users with high temperature requirements for hot water supply in the secondary network without consuming additional high-grade energy, resulting in increased energy consumption and increased construction costs.
The water mixing technology lithium bromide absorption heat exchange system is adopted with a pressure isolation device. By dividing the hot water return water of the secondary network hot water pipeline system into two channels, one flows through the absorber and the condenser, and the other flows through the evaporator and then exchanges heat with the primary network hot water. After mixing, it is output to increase the hot water supply temperature of the secondary network hot water.
While maintaining the temperature difference between hot water supply and return water in the primary network, the hot water supply temperature of the secondary network is increased, the flow rate and energy consumption are reduced, and the construction cost of heating pipeline network and the area of the computer room are reduced.
Smart Images
Figure CN223191864U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air-conditioning and heating equipment, in particular to a lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device. Background Art
[0002] In conventional heating systems, each heat user utilizes a standard heat exchanger. Primary and secondary hot water exchange heat through the heat exchanger, transferring heat from the primary to the secondary. This lowers the temperature of the primary water and raises the temperature of the secondary water, completing the process of the secondary water extracting heat from the primary. The secondary water is then delivered to heat-consuming locations for production, living, and heating. However, with standard heat exchangers, effective heat exchange requires a certain temperature difference between the primary and secondary water. Therefore, the return temperature of the primary water must be higher than that of the secondary water. Once the return temperature of the secondary water is determined, the return temperature of the primary water is limited, limiting the usable temperature difference of the primary water.
[0003] Compared with the heat exchange system using ordinary heat exchangers, the lithium bromide absorption heat exchange system can reduce the return temperature of the primary network hot water when the primary network hot water flow is fixed, breaking through the bottleneck of its higher return temperature than the secondary network hot water temperature, and improving the effective utilization of the temperature difference of the primary network hot water. It can increase the amount of heat extracted and utilized, improve the heating capacity of the system, and reduce the construction cost of the heating pipeline network and the cost of heat transmission.
[0004] Lithium bromide absorption heat exchange systems are gaining increasing popularity, serving a diverse range of heat users with varying secondary network water supply temperature requirements. Conventional lithium bromide absorption heat exchange systems are fully capable of meeting the requirements for lower secondary network hot water supply temperatures, such as in distributed heating stations. However, for higher secondary network hot water supply temperature requirements, such as in relay energy stations, conventional lithium bromide absorption heat exchange systems, due to their inherent technical limitations, struggle to achieve the required secondary network water supply temperature. This requires the consumption of significant amounts of high-grade energy sources, such as natural gas, hindering waste heat recovery and increasing energy consumption. This increases the investment cost of conventional lithium bromide absorption heat exchange systems and the equipment room footprint. If new processes and systems could be implemented that maintain a large temperature difference between the primary network hot water supply and return water, while simultaneously increasing the secondary network hot water supply temperature without consuming additional high-grade energy sources, such as natural gas, reducing the secondary network hot water flow rate, and lowering transmission energy consumption, the goal would be to effectively improve heat quality while reducing heating network construction costs and equipment room footprint. Utility Model Content
[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device, which can not only maintain a large temperature difference between the hot water supply and return water of the primary network, but also increase the hot water supply temperature of the secondary network without consuming additional high-grade energy such as gas, widen the supply and return water temperature difference of the secondary network hot water system, reduce the flow rate of the secondary network hot water, reduce the transportation energy consumption, and effectively improve the heating quality while reducing the construction cost of the heating pipe network and reducing the area occupied by the machine room.
[0006] The purpose of this utility model is achieved in this way:
[0007] A lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device comprises a primary network hot water pipeline system, a secondary network hot water pipeline system, a pressure isolation device and a lithium bromide absorption heat pump unit. The lithium bromide absorption heat pump unit comprises an evaporator, an absorber, a condenser and a generator. The primary network hot water from the primary network hot water pipeline system enters and exits the pressure isolation device and then returns to the primary network hot water pipeline system. The secondary network hot water from the secondary network hot water pipeline system is divided into two paths in parallel. The first path flows through the absorber and the condenser in parallel, in series or in series and parallel. The second path flows through the evaporator for cooling, then exchanges heat with the primary network hot water through the pressure isolation device to increase its temperature, then enters the generator as a driving heat source for cooling, and finally mixes with the first path of secondary network hot water and flows out through the secondary network hot water pipeline system.
[0008] Preferably, the lithium bromide absorption heat pump unit can be a single-effect, double-effect or two-stage unit.
[0009] Preferably, the medium of the primary hot water network can be water, thermal oil or other medium. The secondary hot water network can also be other liquid medium.
[0010] Preferably, the primary network hot water system and the secondary network hot water system can be closed circulation systems or open circulation systems.
[0011] The beneficial effects of the utility model are:
[0012] 1. While the primary network supply and return water temperatures remain unchanged, the system's secondary network water supply temperature is increased to effectively improve the heating quality.
[0013] 2. Due to the increase in the secondary network water supply temperature of the system, the supply and return water temperature difference of the secondary network water system is widened, which reduces the flow of hot water in the secondary network, reduces the transportation energy consumption, and reduces the construction cost of the heating pipeline network.
[0014] 3. No additional energy consumption is required, which reduces the equipment investment cost of the lithium bromide absorption heat exchange system and reduces the floor space of the machine room. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1This is a working principle diagram of a lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device in the utility model.
[0016] Among them: primary network hot water piping system 1; secondary network hot water piping system 2; pressure isolation device 3; lithium bromide absorption heat pump unit 4; evaporator 401; absorber 402; condenser 403; generator 404; primary network hot water inlet A1; primary network hot water outlet A2; secondary network hot water inlet B1; secondary network hot water outlet B2. DETAILED DESCRIPTION
[0017] See also Figure 1 The utility model relates to a lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device, which includes a primary network hot water pipeline system 1, a secondary network hot water pipeline system 2, a pressure isolation device 3 and a lithium bromide absorption heat pump unit 4. The lithium bromide absorption heat pump unit 4 includes an evaporator 401, an absorber 402, a condenser 403 and a generator 404. The primary network hot water from the primary network hot water pipeline system 1 exchanges heat with the secondary network hot water through the pressure isolation device 3, transferring the heat in the primary network hot water to the secondary network hot water, and the primary network water supply temperature drops and returns to the primary network. In the hot water pipe system 1, the temperature of the hot water in the secondary network rises; the hot water return water from the secondary network hot water pipe system 2 is divided into two paths in parallel. The first path flows through the absorber 402 and the condenser 403 of the lithium bromide absorption heat pump unit 4 in parallel, series, or series-parallel. The second path flows through the evaporator 401 of the lithium bromide absorption heat pump unit 4 to cool down, and then exchanges heat with the hot water in the primary network through the pressure isolation device 3 to heat up, and then enters the generator 404 of the lithium bromide absorption heat pump unit 4 as a driving heat source to cool down, and finally mixes with the hot water in the first path of the secondary network and flows out through the secondary network hot water pipe system 2.
[0018] The lithium bromide absorption heat pump unit can be a single-effect, double-effect, or two-stage unit. The primary hot water medium can be water, thermal oil, or other medium. The secondary hot water medium can also be other liquid media. The primary and secondary hot water systems can be closed-circulation or open-circulation systems.
[0019] One of the secondary network hot water flows through the absorber 402 and condenser 403 of the lithium bromide absorption heat pump unit 4 in series, and can also flow through the absorber 402 and condenser 403 of the lithium bromide absorption heat pump unit 4 in parallel or in any series or series-parallel form.
[0020] The pressure isolating device may be a plate heat exchanger, a shell and tube heat exchanger, or a shell and tube heat exchanger.
[0021] This utility model divides the hot water return from the secondary network hot water pipe system into two paths by setting up a lithium bromide absorption heat pump unit. One path flows through the absorber and condenser, and then mixes with the other path of secondary network hot water after cooling by the generator, and then flows out through the secondary network hot water pipe system, thereby increasing the secondary network hot water supply temperature. Compared with previous technologies, this patent can achieve the goal of maintaining a large temperature difference between the primary network hot water supply and return water, and at the same time, without consuming additional high-quality energy such as gas, to increase the secondary network hot water supply temperature, widen the supply and return water temperature difference of the secondary network hot water system, reduce the flow rate of the secondary network hot water, reduce the transmission energy consumption, and effectively improve the heating quality while reducing the construction cost of the heating pipe network and the floor space occupied by the machine room.
[0022] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.
Claims
1. A lithium bromide absorption heat exchange system using water mixing technology and a pressure isolation device, comprising a primary network hot water piping system, a secondary network hot water piping system, a pressure isolation device, and a lithium bromide absorption heat pump unit, wherein the lithium bromide absorption heat pump unit comprises an evaporator, an absorber, a condenser, and a generator, and is characterized in that: The primary hot water from the primary network hot water pipeline system enters and exits the pressure isolation device and then returns to the primary network hot water pipeline system. The secondary network hot water from the secondary network hot water pipeline system is divided into two paths in parallel. The first path flows through the absorber and condenser in parallel, series, or series-parallel. The second path flows through the evaporator for cooling, and then passes through the pressure isolation device for heat exchange with the primary network hot water to heat up, and then enters the generator as a driving heat source for cooling. Finally, it is mixed with the first path of secondary network hot water and flows out through the secondary network hot water pipeline system.
2. The lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device according to claim 1, characterized in that: The lithium bromide absorption heat pump unit can be a single-effect, double-effect or two-stage unit.
3. The lithium bromide absorption heat exchange system with a water mixing technology and a pressure isolation device according to claim 1, characterized in that: The primary network hot water pipeline system and the secondary network hot water pipeline system are closed circulation systems or open circulation systems.