Fluid pressure difference energy recovery system
By using a fluid pressure differential energy recovery system, the excess pressure differential in the pressure-isolated heat exchange fluid transmission and distribution network is converted into fluid flow power, which solves the problems of complex equipment and poor return on investment in existing technologies, and achieves equipment simplification and energy consumption reduction.
Patent Information
- Application Number
- CN202410361863.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2026-02-24
AI Technical Summary
Existing technologies struggle to effectively utilize excess pressure differentials in pressure-isolated heat exchange fluid distribution networks, and traditional designs are complex and offer poor returns on investment.
A fluid differential pressure energy recovery system is adopted, which converts excess pressure difference into the power required for fluid flow through a fluid differential pressure energy recovery device. The system includes an active pump head, a driven pump head, and transmission components, preferably a centrifugal pump. The transmission method is a coupling or magnetic coupler. The active pump head runs in reverse and the driven pump head runs in forward to realize energy conversion.
It simplifies equipment structure, reduces equipment investment, decreases energy consumption, improves system efficiency, and is easy to promote and apply.
Smart Images
Figure CN121557022A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fluid transport and distribution technology, and in particular to a fluid differential pressure energy recovery system for use in pressure-isolated heat exchange fluid transport and distribution networks. Background Technology
[0002] Typical pressure-isolating heat exchange fluid distribution systems include centralized cooling water systems and centralized heating hot water systems. The following explanation uses a centralized heating hot water system as an example. A centralized heating hot water system generally consists of a heat source, a primary pipe network, heat exchange stations, a secondary pipe network, and heat users. Heat exchange stations are typically located close to the heat users, transferring heat from the primary pipe network to the secondary pipe network via heat exchange equipment, and then distributing the heat to the users through circulating pumps in the secondary pipe network. The primary pipe network is generally a branched network, with branch primary pipes continuously extending from the heat source, each branch connecting to the heat exchange equipment in its corresponding heat exchange station. The length of the primary pipe network is typically several kilometers or even tens of kilometers; therefore, high-lift circulating pumps are usually installed at the heat source to overcome the resistance loss during hot water delivery. While the distance between the heat exchange stations and the circulating pumps varies along the route, the resistance of the primary pipe network within each heat exchange station is almost the same. The water pressure diagram of the primary pipeline network shows that the primary pipeline network of the heat exchange station near the heat source has a lot of excess pressure differential. In conventional design, this excess pressure differential is usually consumed by reducing the pipe size and adding balancing valves.
[0003] Some experts have proposed using distributed pumps, which involve installing circulating pumps in the primary network at each heat exchange station. This would alter the water pressure distribution within the primary network and reduce the head of the circulating pumps at the heat source. However, controlling these distributed pumps at each heat exchange station would become complex. Furthermore, the traditional design of using a main circulating pump at the heat source differs significantly from the distributed pump design, limiting the acceptance of this technology by heating operators and hindering its widespread adoption. Other experts have suggested incorporating hydroelectric power generation and energy storage systems in the heat exchange stations to convert this excess pressure differential into electricity. However, these systems are overly complex and lack economic viability.
[0004] This invention proposes a novel device and method for recovering excess pressure differentials in pressure-diffusion heat exchange fluid distribution networks. A fluid pressure differential energy recovery device is installed in the network to convert the excess pressure differential into the power required for fluid flow. Compared with existing technologies, this invention features simpler equipment, lower investment, and is easier to promote and utilize. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fluid pressure differential energy recovery system. The fluid pressure differential energy recovery device can simply and reliably convert the excess pressure differential in the pressure-isolated heat exchange fluid transmission and distribution network into the power required for fluid flow.
[0006] To achieve the above objectives, the technical solution of the present invention is: a fluid pressure differential energy recovery system, wherein a fluid pressure differential energy recovery device is provided within the system, the fluid pressure differential energy recovery device comprising an active pump head, a driven pump head, and a transmission component between the two pump heads. The active and driven pump heads are modified fluid pumps after removing the prime mover, preferably centrifugal pumps. The active pump head operates in reverse mode, and the driven pump head operates in forward mode. The transmission component can be a direct contact transmission such as coupling transmission, gear transmission, belt transmission, chain transmission, etc., or a non-contact transmission such as magnetic coupler transmission; the preferred transmission methods are coupling transmission and magnetic coupler transmission. The preferred working principle of the fluid pressure differential energy recovery system is as follows: the active pump head is connected to the primary pipeline network, and the driven pump head is connected to the secondary pipeline network. Under the action of the pressure difference before and after the active pump head, its internal impeller rotates, and then the transmission component drives the impeller inside the driven pump head to rotate, thus converting the excess pressure differential in the primary pipeline network into the power required for fluid flow in the secondary pipeline network. Attached Figure Description
[0007] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only the simplest embodiments of the present invention, and these drawings are only examples omitting some details and are not necessarily drawn to scale. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0008] Figure 1 This is a schematic diagram of the structure of a fluid differential pressure energy recovery device provided by the present invention; Figure 2 This is a schematic diagram illustrating the working principle of the first fluid pressure differential energy recovery system provided by the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the second fluid pressure differential energy recovery system provided by the present invention; In the diagram: 1. Fluid pressure differential energy recovery unit; 11. Active pump head; 12. Driven pump head; 13. Transmission components; 2. Heat exchange equipment; 31. No. 1 hot water circulation pump; 32. No. 2 hot water circulation pump; 33. Regulating valve; a / b. Primary network hot water inlet and outlet; c / d. Secondary network hot water inlet and outlet; Detailed Implementation
[0009] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely specific embodiments of the present invention, and not all embodiments.
[0010] Combination Figure 1 This embodiment provides a fluid pressure differential energy recovery device 1, which includes an active pump head 11, a driven pump head 12, and a transmission component 13 between the two pump heads. The active pump head 11 and the driven pump head 12 are centrifugal pumps, and the transmission component 13 is a coupling transmission. The fluid pressure differential energy recovery device 1 can be fixed to a pipeline network through pipes connected to both ends of the pump heads, or it can be fixed by its own support (the details of the support are not shown in the accompanying drawings).
[0011] Combination Figure 2 This invention provides a first type of fluid pressure differential energy recovery system, named Embodiment 1, for use in centralized heating hot water pipe networks. It includes a fluid pressure differential energy recovery unit 1, a heat exchange device 2, a #1 hot water circulation pump 31, a #2 hot water circulation pump 32, and a regulating valve 33. The active pump head 11 of the fluid pressure differential energy recovery unit 1 is connected to the primary pipe network, and the driven pump head 12 is connected to the secondary pipe network. The #1 hot water circulation pump 31 and the #2 hot water circulation pump 32 are connected to the secondary pipe network. The driven pump head 12 is connected in series with the #1 hot water circulation pump 31 and then in parallel with the #2 hot water circulation pump 32. A regulating valve 33, which is a two-way regulating valve, is installed on the return water pipe of the primary pipe network.
[0012] Normally, the hot water flow rate of the primary pipe network is less than that of the secondary pipe network. When the active pump head 11 and the driven pump head 12 are driven by a coupling, the two pump heads rotate at the same speed. The flow rate and head of the driven pump head 12 are closely related to those of the active pump head 11. By reasonably matching the parameters of the active pump head 11 and the driven pump head 12, the effect of the driven pump head 12 and the No. 1 hot water circulation pump 31 connected in series can meet the flow rate and head requirements of the secondary pipe network hot water circulation. Conventionally, the secondary pipe network hot water circulation pump is set up with two identical circulation pumps, one for use and one for standby. After applying the fluid pressure difference energy recovery device 1 described in this invention, the No. 2 hot water circulation pump is used as the standby pump, and the No. 1 hot water circulation pump 31 and the driven pump head 12 work together as the working pumps. At this time, the head of the No. 1 hot water circulation pump 31 is smaller than that of the No. 2 hot water circulation pump, which reduces its power consumption and the equipment purchase price. If further reduction in equipment investment is desired, hot water circulation pump 31 (No. 1) and hot water circulation pump 32 (No. 2) can be connected in parallel and then connected in series with the driven pump head 12.
[0013] As a preferred option, Figure 2The primary pipeline of the fluid pressure differential energy recovery system described herein does not have resistance balancing valves other than the regulating valve 33. The active pump head 11 is designed and selected based on the maximum recoverable pressure differential and the maximum flow rate of the primary pipeline. The driven pump head 12 is designed and selected based on the active pump head 11 and the maximum flow rate of the secondary pipeline. The No. 1 hot water circulation pump 31 and the No. 2 hot water circulation pump 32 adopt speed control, preferably variable frequency speed control. The regulating valve 33 adopts automatic control, preferably an electric regulating valve. When the heat load of the secondary pipeline decreases and the flow rate of the secondary pipeline needs to be reduced, the No. 1 hot water circulation pump 31 operates at a reduced speed. The regulating valve 33 actuates to reduce the flow rate through the active pump head 11, thereby reducing the flow rate of the driven pump head 12. When the adjustment ends and a new balance is reached, the flow rate of the driven pump head 12 is the same as the flow rate of the No. 1 hot water circulation pump 31. At this time, the flow rate in the secondary pipeline meets the requirements for reducing the heat load.
[0014] Combination Figure 3 A second fluid pressure differential energy recovery system is provided, named Example 2. The differences between Example 2 and Example 1 are as follows: (1) In Example 2, the driven pump head 12 is connected in parallel with the No. 1 hot water circulation pump 31 and the No. 2 hot water circulation pump 32. (2) In Example 2, the regulating valve 33 is a three-way regulating valve, which is installed on the primary water supply pipe.
[0015] As a preferred option, Figure 3 The primary pipeline of the fluid pressure differential energy recovery system described herein does not have resistance balancing valves other than the regulating valve 33. The active pump head 11 is designed and selected based on the maximum recoverable pressure differential and the maximum flow rate of the primary pipeline. The driven pump head 12 is designed and selected based on the maximum resistance of the active pump head 11 and the secondary pipeline. The No. 1 hot water circulation pump 31 and the No. 2 hot water circulation pump 32 adopt speed control, preferably variable frequency speed control. The regulating valve 33 adopts automatic control, preferably an electric regulating valve. When the heat load of the secondary pipeline decreases and the flow rate of the secondary pipeline needs to be reduced, the No. 1 hot water circulation pump 31 operates at a reduced speed. The regulating valve 33 actuates to reduce the flow rate through the active pump head 11, thereby reducing the flow rate of the driven pump head 12. When the adjustment ends and a new balance is reached, the sum of the flow rates of the driven pump head 12 and the No. 1 hot water circulation pump 31 meets the requirements for reducing the heat load of the secondary pipeline.
[0016] The implementation schemes provided in Embodiment 1 and Embodiment 2 can be modified in various ways to form more embodiments, for example as follows: (1) The fluid flow direction of the active pump head 11 and the driven pump head 12 of the fluid differential pressure energy recovery device 1 can be the same. (2) The fluid differential pressure energy recovery device 1 can also be set before the heat exchange device 2. (3) The No. 2 hot water circulation pump 32 can be a working pump or a standby pump, and can be removed from the implementation scheme as it is a non-essential device. (4) The regulating valve 33 can be set on the water supply pipe of the primary pipe network or on the water return pipe of the primary pipe network. (5) When the heat load of the secondary pipeline does not change with time, or the entire pipeline operates at a constant flow rate and the required secondary pipeline flow rate is small, or the pressure difference that can be recovered in the primary pipeline is large, the fluid pressure difference energy recovery system may only need to connect the active pump head 11 of the fluid pressure difference energy recovery device 1 to the primary pipeline and the driven pump head 12 to the secondary pipeline to meet the requirements. There is no need to set up a secondary pipeline circulation pump, and the regulating valve 33 set on the primary pipeline is not necessary. The above possibility exists in the heat exchange station that is close to the heat source and has a small load in the hot water heating pipeline.
[0017] The above implementation plan can be used not only in hot water heating networks, but also in other applications of pressure-isolated heat exchange fluid distribution, such as centralized cooling systems.
[0018] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.
Claims
1. A fluid pressure differential energy recovery system for use in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The pipeline network includes a fluid differential pressure energy recovery unit 1, which includes an active pump head 11, a driven pump head 12, and a transmission component 13 between the two pump heads. The active pump head 11 is connected to the primary pipeline network, and the driven pump head 12 is connected to the secondary pipeline network. The active pump head 11 and the driven pump head 12 are modified from fluid pumps after the prime mover has been removed. The active pump head 11 operates in the reverse mode of the pump, and the driven pump head 12 operates in the forward mode of the pump. The transmission component 13 is a direct contact transmission such as coupling transmission, gear transmission, belt transmission, chain transmission, etc., or a non-contact transmission such as magnetic coupling transmission, etc.
2. The fluid pressure differential energy recovery system as described in claim 1, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The active pump head 11 and the driven pump head 12 are centrifugal pumps.
3. A fluid pressure differential energy recovery system as described in any one of claims 1-2, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, It also includes a No. 1 circulating pump 31 connected to the secondary pipeline network, wherein the No. 1 circulating pump 31 and the driven pump head 12 are connected in series or in parallel.
4. A fluid pressure differential energy recovery system as described in any one of claims 1-3, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, It also includes a No. 2 circulating pump 32 connected to the secondary pipeline network. The No. 1 circulating pump 31 and the driven pump head 12 are connected in series and then connected in parallel with the No. 2 circulating pump 32, or the No. 1 circulating pump 31 and the No. 2 circulating pump 32 are connected in parallel and then connected in series with the driven pump head 12, or the No. 1 circulating pump 31, the No. 2 circulating pump 32 and the driven pump head 12 are connected in parallel.
5. A fluid pressure differential energy recovery system as described in any one of claims 1-4, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, It also includes regulating valve 33 connected to the primary pipeline network.
6. A fluid pressure differential energy recovery system as described in any one of claims 1-5, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The No. 1 circulating pump 31 adopts speed regulation control.
7. A fluid pressure differential energy recovery system as described in any one of claims 1-6, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The regulating valve 33 is an automatic control valve.
8. The fluid pressure differential energy recovery system as described in claim 6, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The No. 1 circulating pump 31 adopts variable frequency speed control.
9. The fluid pressure differential energy recovery system as described in claim 7, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The regulating valve 33 is an electric regulating valve.
10. The fluid pressure differential energy recovery system as described in claim 9, used in a pressure-isolated heat exchange fluid transmission and distribution network, characterized in that, The regulating valve 33 is an electric two-way regulating valve or an electric three-way regulating valve.