Reclaimed water conveying method and system integrating energy recovery and electric energy storage

Abstract

The invention discloses a reclaimed water conveying method and system integrating energy recovery and electric energy storage, and relates to the technical field of reclaimed water conveying. The method comprises the following specific steps: purifying original wastewater through pretreatment and advanced treatment to obtain reclaimed water; conveying the reclaimed water through an urban reclaimed water pipe network; a hydroelectric generation device is arranged in an urban reclaimed water supply system, gravitational potential energy of water flow in the reclaimed water conveying process is converted into electric energy, and energy recovery is carried out; and the recycled electric energy is stored in the energy storage equipment and is used for the operation of a subsequent reclaimed water conveying system. Energy recovery and electric energy storage are achieved in the reclaimed water conveying process, the energy utilization efficiency is improved, dependence on external energy is reduced by recovering energy in the reclaimed water flowing process, and the conveying cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of recycled water transportation, and in particular to a recycled water transportation method and system integrating energy recovery and electric energy storage. Background Art

[0002] With the development of society and the growth of population, the demand for water resources continues to increase. As an important water resource, the utilization of recycled water has become increasingly important. However, traditional recycled water is often discharged directly, which not only causes a great waste of water resources, but also puts pressure on the environment. Under the dual challenges of energy shortage and environmental protection, it is imperative to find a more efficient and energy-saving method for recycled water utilization. At present, although some recycled water delivery systems have adopted energy recovery technology, these systems often have the following problems: low energy recovery efficiency: due to technical limitations, existing energy recovery devices often cannot fully utilize the energy of recycled water, resulting in low recovery efficiency; low system integration: energy recovery and electrical energy storage are often two independent links, lack of effective integration, resulting in poor overall performance of the system. Therefore, for those skilled in the art, how to develop a recycled water delivery system integrating energy recovery and electrical energy storage to improve energy utilization efficiency is an urgent problem to be solved. Summary of the invention

[0003] The object of the present invention is to provide a method and system for transporting recycled water integrating energy recovery and electric energy storage, so as to solve the problems raised in the background technology.

[0004] To achieve the above objectives, the present invention provides the following solutions: On the one hand, a method for transporting recycled water integrating energy recovery and electric energy storage is provided, and the specific steps include the following:

[0005] Purify the original wastewater through pre-treatment and deep treatment operations to obtain recycled water;

[0006] The recycled water is transported through the urban recycled water network;

[0007] Install a hydroelectric power generation device in the urban recycled water system to convert the gravitational potential energy of the water flow during the recycled water transportation process into electrical energy for energy recovery;

[0008] The recovered electrical energy is stored in the energy storage device and used for the subsequent operation of the recycled water delivery system.

[0009] Preferably, the specific steps of pre-treating the raw wastewater are:

[0010] First, coarse particles and suspended solids in the raw wastewater are removed through a screen, a grit chamber, and a primary sedimentation tank to achieve solid-liquid separation. In this process, the generated sludge is used for biomass energy recovery through anaerobic digestion technology;

[0011] After solid-liquid separation, the wastewater enters the membrane treatment process, where impurities in the wastewater are removed through ultrafiltration and reverse osmosis technology. At the same time, during the reflux of the concentrated liquid, energy is recovered through the pressure energy recovery device.

[0012] By adopting the above technical solution, the following beneficial technical effects can be achieved: through anaerobic fermentation technology, the organic matter in the drainage is converted into bioenergy (such as biogas), which can be used for power generation or heating, realizing organic matter energy recovery.

[0013] Preferably, it also includes performing real-time power detection on the energy storage device, and comparing the detected real-time power with a standard power threshold, and controlling the charging or discharging state of the energy storage device in a timely manner according to the comparison result.

[0014] Preferably, the urban recycled water supply system includes urban recycled water treatment facilities, a hydroelectric power generation device, recycled water storage facilities and recycled water supply facilities, wherein the hydroelectric power generation device is connected to a heat source.

[0015] Preferably, the process of transporting the regenerated water through the urban heating network is as follows: the pre-treated regenerated water enters the urban regenerated water supply system through the water injection pipe, and in the regenerated water treatment stage, the heat-absorbing side of the heat pump absorbs the heat of the heating network water, and the heat-releasing side uses the absorbed heat to heat the heating network water entering the heat-releasing side, the water outlet of the heat-absorbing side is connected to the water user, and the heat-releasing side is connected to the urban heating network or the secondary heating network. In the regenerated water transportation stage, the hydroelectric power generation device converts gravitational potential energy into kinetic energy to generate electricity.

[0016] Preferably, the energy storage device includes a battery or a supercapacitor.

[0017] By adopting the above technical solution, the following beneficial technical effects can be achieved: the electric energy generated by the above method is stored in a battery, and when needed, the stored electric energy can be released for the transportation of recycled water or other purposes, thereby improving energy utilization efficiency.

[0018] On the other hand, a regenerated water delivery system integrating energy recovery and electric energy storage is provided, comprising a water treatment module, a regenerated water delivery module, an energy recovery module, and an energy storage module; wherein:

[0019] The water treatment module is used to purify the raw wastewater through pretreatment operations to obtain recycled water;

[0020] The regenerated water delivery module is used to deliver the regenerated water through the urban regenerated water supply network;

[0021] The energy recovery module is used to set up a hydroelectric power generation device in the urban recycled water supply system to convert the gravitational potential energy of the water flow during the recycled water transportation process into electrical energy for energy recovery;

[0022] The energy storage module is used to store the recovered electric energy in the energy storage device for the subsequent operation of the recycled water delivery system.

[0023] Preferably, it also includes a control module connected to the energy storage module, which is used to control the charging or discharging state of the energy storage device.

[0024] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0025] 1. During the transportation of recycled water, due to the kinetic energy and potential energy of the water flow, this part of energy can be recovered and converted into electrical energy, thereby realizing energy reuse. By recycling the energy in the flow of recycled water, the dependence on external energy is reduced and the transportation cost is reduced;

[0026] 2. Make full use of renewable energy to reduce energy consumption and greenhouse gas emissions.

[0027] 3. Improve system reliability, ensure stable urban recycled water output and power generation; energy storage equipment can provide backup power for the recycled water delivery system in the event of a power grid failure or other emergency situations, ensuring stable operation of the system.

[0028] 4. Using recycled water to generate electricity does not require new applications for water intake or the construction of new water intake facilities, saving administrative approval and infrastructure costs and reducing the cost of recycled water utilization.

[0029] 5. Energy recovery and electrical energy storage are realized during the recycled water transportation process, improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 is a flow chart of the method of the present invention;

[0032] Figure 2 It is a system structure diagram of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The object of the present invention is to provide a method for transporting recycled water integrating energy recovery and electrical energy storage, such as Figure 1 As shown, the specific steps include the following:

[0035] S1. Purify the original wastewater through pretreatment and deep treatment operations to obtain recycled water;

[0036] S2. Transporting recycled water through the urban recycled water supply network;

[0037] S3. Install a hydroelectric power generation device in the urban recycled water system to convert the gravitational potential energy of the water flow during the recycled water transportation process into electrical energy for energy recovery;

[0038] S4. Store the recovered electric energy in the energy storage device for use in the subsequent operation of the recycled water delivery system.

[0039] Furthermore, the specific steps of pre-treatment of the raw wastewater are as follows:

[0040] S11. First, coarse particles and suspended solids in the original wastewater are removed through screens, grit chambers, and primary sedimentation tanks to achieve solid-liquid separation. In this process, the generated sludge is used for biomass energy recovery through anaerobic digestion technology;

[0041] S12. After solid-liquid separation, the wastewater enters the membrane treatment process, and impurities in the wastewater are removed through ultrafiltration and reverse osmosis technology or wetland purification technology. At the same time, during the reflux of the concentrated liquid, energy recovery is achieved through the pressure energy recovery device.

[0042] Furthermore, it also includes real-time power detection of the energy storage device, and comparing the detected real-time power with the standard power threshold, and timely controlling the charging or discharging state of the energy storage device according to the comparison result. The energy storage device includes a battery and a super capacitor.

[0043] Although energy recovery can reduce the energy consumption of the recycled water delivery system to a certain extent, the recovered electric energy is often intermittent and unstable. In order to ensure the stable operation of the system, the recovered electric energy needs to be stored so that it can be released when needed. Electric energy storage equipment can effectively solve the intermittent problem of energy recovery and improve the reliability and stability of the system. At the same time, the stored electric energy can also be released when the power grid load is peak, playing the role of peak load shifting and valley filling, and improving the operation efficiency of the power grid.

[0044] Furthermore, it also includes controlling the power of the energy storage device, and the specific steps are: the energy storage device includes a battery module and a regulating module, the input end of the regulating module is connected to the power supply end, the output end of the battery module is connected to the output end of the regulating module and then connected to the load, so that the battery module and the regulating module can simultaneously supply power to the load, and the output end of the regulating module is also connected to the input end of the battery module, so that the regulating module can charge the battery module. When the power supply end is supplying power normally, the current power of the battery module is obtained; it is determined whether the current power reaches the preset power threshold; it is determined whether the load is in a power-using state; if the current power reaches the power threshold and the load is in a power-using state, the output voltage of the regulating module is adjusted to reduce the battery current of the battery module to a first set range, thereby maintaining the power of the battery module in the preset power range; if the current power reaches the power threshold and the load is not in a power-using state, the output voltage of the regulating module is adjusted to be consistent with the battery voltage of the battery module, so that the battery current of the battery module is reduced to a first set range, thereby maintaining the power of the battery module in the preset power range.

[0045] Furthermore, the reclaimed water supply system includes urban reclaimed water treatment facilities, a hydroelectric power generation device, reclaimed water storage facilities and reclaimed water supply facilities, wherein the hydroelectric power generation device is connected to a heat source. The process of transporting the reclaimed water through the urban reclaimed water supply system is as follows: the pre-treated reclaimed water enters the urban reclaimed water supply system through a water injection pipe, and during the reclaimed water treatment stage, the heat-absorbing side of the heat pump absorbs the heat of the hot water network, and the heat-releasing side uses the absorbed heat to heat the hot water network entering the heat-releasing side, the water outlet of the heat-absorbing side is connected to the water user, and the heat-releasing side is connected to the urban hot water network or the secondary hot water network. During the reclaimed water transportation stage, the hydroelectric power generation device converts gravitational potential energy into kinetic energy to generate electricity.

[0046] In another aspect, a reclaimed water delivery system integrating energy recovery and electrical energy storage is provided, such as Figure 2 As shown, it includes a water treatment module, a recycled water delivery module, an energy recovery module, and an energy storage module; wherein,

[0047] A water treatment module is used to purify the raw wastewater through pretreatment operations to obtain recycled water;

[0048] A recycled water delivery module, used for delivering the recycled water through the urban recycled water network;

[0049] Energy recovery module, used to set up a hydroelectric power generation device in the urban recycled water supply system, converts the gravitational potential energy of the water flow during the recycled water transportation process into electrical energy for energy recovery;

[0050] The energy storage module is used to store the recovered electrical energy in the energy storage device for the subsequent operation of the recycled water delivery system.

[0051] It also includes a control module, which is connected to the energy storage module and is used to control the charging or discharging state of the energy storage device.

[0052] It also includes monitoring and management of the entire recycled water delivery system, including regulating water flow rate, controlling the operation of energy recovery devices and electrical energy storage equipment, etc., and performing intelligent control according to actual needs to achieve efficient operation of the system.

[0053] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for transporting recycled water integrating energy recovery and electric energy storage, characterized in that: The specific steps include the following: Purify the original wastewater through pre-treatment and deep treatment operations to obtain recycled water; The recycled water is transported through the urban recycled water network; Install a hydroelectric power generation device in the urban recycled water supply system to convert the gravitational potential energy of the water flow during the recycled water transportation process into electrical energy for energy recovery; The recovered electrical energy is stored in the energy storage device and used for the subsequent operation of the recycled water delivery system.

2. A method for transporting recycled water integrating energy recovery and electric energy storage according to claim 1, characterized in that: The specific steps of pretreatment of raw wastewater are: First, coarse particles and suspended solids in the raw wastewater are removed through a screen, a grit chamber, and a primary sedimentation tank to achieve solid-liquid separation. In this process, the generated sludge is used for biomass energy recovery through anaerobic digestion technology; After solid-liquid separation, the wastewater enters the membrane treatment process, where impurities in the wastewater are removed through ultrafiltration and reverse osmosis technology. At the same time, during the flow of the concentrated liquid, energy is recovered by utilizing the drop in height through a hydropower generation device.

3. A method for transporting recycled water integrating energy recovery and electric energy storage according to claim 1, characterized in that: It also includes real-time power detection of the energy storage device, and comparing the detected real-time power with a standard power threshold, and controlling the charging or discharging state of the energy storage device in a timely manner according to the comparison result.

4. A method for transporting recycled water integrating energy recovery and electric energy storage according to claim 1, characterized in that: The urban recycled water supply system comprises urban recycled water treatment facilities, a hydroelectric power generation device, recycled water storage facilities and recycled water supply facilities, wherein the hydroelectric power generation device is connected to a heat source.

5. A method for transporting recycled water integrating energy recovery and electric energy storage according to claim 4, characterized in that: The process of transporting the regenerated water through the urban regenerated water supply system is as follows: the pretreated regenerated water enters the urban regenerated water supply system through the water injection pipe; in the regenerated water treatment stage, the heat-absorbing side of the heat pump absorbs the heat of the hot network water, and the heat-releasing side uses the absorbed heat to heat the hot network water entering the heat-releasing side; the water outlet of the heat-absorbing side is connected to the water user, and the heat-releasing side is connected to the urban hot network or the secondary hot network; in the regenerated water transportation stage, the hydroelectric power generation device converts gravitational potential energy into kinetic energy to generate electricity.

6. A method for transporting reclaimed water integrating energy recovery and electric energy storage according to claim 1, characterized in that: The energy storage device includes a battery and a super capacitor.

7. A reclaimed water delivery system integrating energy recovery and electric energy storage, characterized in that: It includes water treatment module, recycled water delivery module, energy recovery module and energy storage module; among which, The water treatment module is used to purify the raw wastewater through pretreatment operations to obtain recycled water; The regenerated water delivery module is used to deliver the regenerated water through the urban regenerated water supply system; The energy recovery module is used to set up a hydroelectric power generation device in the urban recycled water supply system to convert the gravitational potential energy of the water flow during the recycled water transportation process into electrical energy for energy recovery; The energy storage module is used to store the recovered electric energy in the energy storage device for the subsequent operation of the recycled water delivery system.

8. The reclaimed water delivery system integrating energy recovery and electric energy storage according to claim 7, characterized in that: It also includes a control module, which is connected to the energy storage module and is used to control the charging or discharging state of the energy storage device.

Images