Sea water desalination self-adaptive energy-saving system with energy recovery device

Abstract

The utility model discloses a sea water desalination self-adaptive energy-saving system with an energy recovery device, which is characterized in that a salinity monitoring instrument, a teletransmission flowmeter and a low-pressure switch are arranged at the inlet end of a high-pressure pump, a teletransmission pressure gauge is arranged at the outlet end of the high-pressure pump, pressurized strong brine of a reverse osmosis membrane group is divided into two paths, one path enters a turbine side inlet of the energy recovery device, and the other path enters a turbine side outlet of the energy recovery device; the other path is a shunting pipeline which is provided with a flow linear regulating valve and a remote flow meter and is used for discharging concentrated water, and the salinity monitoring instrument, the low-voltage switch, the high-pressure pump with the frequency converter and the flow linear regulating valve are connected with the intelligent controller through a circuit. And the intelligent controller can analyze the collected data of the salinity monitoring instrument and intelligently control the opening and closing of the flow linear regulating valve, so that the stability and high efficiency of the system under variable working conditions are ensured.

Description

Technical Field

[0001] The utility model belongs to the field of seawater desalination and utilization engineering, and specifically relates to a seawater desalination self-adaptive energy-saving system with an energy recovery device. Background Art

[0002] Reverse osmosis desalination technology is one of the important means to solve water shortage. The reverse osmosis system is mainly composed of a high-pressure pump, an energy recovery device and a reverse osmosis membrane group. The turbine energy recovery device is an important form of energy-saving equipment for seawater desalination. The turbine energy recovery device consists of a coaxial pump side and a turbine side. The turbine side recovers the residual pressure energy in the high-pressure concentrated seawater discharged by the membrane group, and then converts it into the hydraulic energy of the membrane-inlet seawater through the coaxial pump side, achieving energy saving and consumption reduction. This form of energy recovery device has the advantages of simple structure, high recovery rate, and strong adaptability.

[0003] In the desalination system using a turbine energy recovery device, the salinity of the seawater entering the membrane is an important factor affecting the water production cost and energy consumption. For example, the salinity of seawater in the estuary area has obvious fluctuation characteristics due to the seasonal flood discharge of the river. When the salinity of the original seawater changes, the pressure required to enter the membrane will also change accordingly. In order to meet the fluctuating pressure requirements, it is often necessary to set up multiple high-pressure pumps to match different pressure requirements. The adaptability and operational flexibility of the seawater desalination process are poor, and the initial investment cost is high and the operation is complicated.

[0004] Patent CN111268764A proposes an automatic monitoring system for reverse osmosis desalination using a turbine energy recovery device, which controls and detects the reverse osmosis desalination system and reduces the device fault detection and maintenance time. Patent CN112390328A proposes a connection method in the form of a desalination system using a turbine energy recovery device, which makes full use of the residual pressure discharged by the membrane assembly, has low unit energy consumption and significant energy-saving effect. Patent CN209910919U discloses a PX energy recovery device fault monitoring system, which monitors whether the system fails by measuring the conductivity of the liquid in charge of the energy recovery device, but the monitoring has lag and complexity. Patent CN216593758U discloses an online monitoring device for PX energy recovery equipment, which solves the shortcomings of waste of manpower, complex detection equipment and poor timeliness in traditional monitoring methods by setting up electromagnetic switch valves, vibration sensors and computer control systems.

[0005] In view of the current problems and deficiencies of existing technologies, an adaptive energy-saving system for seawater desalination with an energy recovery device is developed, which is of great significance to the economy and stability of seawater desalination. Utility Model Content

[0006] Aiming at the technical problem of poor adjustability of existing working conditions, the utility model proposes an energy-saving process system with a turbine-type energy recovery device which can be applied to different salinity changes.

[0007] The utility model provides a seawater desalination adaptive energy-saving system with an energy recovery device, wherein low-pressure seawater flows into the inlet of a high-pressure pump, the outlet of the high-pressure pump is connected to the pump side inlet of the energy recovery device, and the pump side outlet of the energy recovery device is connected to a reverse osmosis membrane group;

[0008] The inlet end of the high-pressure pump is provided with a salinity monitoring instrument, a remote flow meter, and a low-pressure switch, and the outlet end of the high-pressure pump is provided with a remote pressure gauge;

[0009] The pump side inlet and outlet of the energy recovery device are both provided with remote pressure gauges, the turbine side inlet of the energy recovery device is provided with a remote pressure gauge, and the outlet is provided with a remote pressure gauge and a remote flow meter;

[0010] The pressurized brine of the reverse osmosis membrane group is divided into two paths, one path enters the turbine side inlet of the energy recovery device, and the other path is a diversion pipeline provided with a flow linear regulating valve and a remote flow meter for discharging the brine;

[0011] The salinity monitoring instrument, low-pressure switch, high-pressure pump, flow linear regulating valve and intelligent controller are connected through a circuit;

[0012] The high-pressure pump is a high-pressure pump with a frequency converter.

[0013] The beneficial effects of the present application are as follows: the intelligent controller can analyze the data collected by the salinity monitoring instrument and control the opening and closing of the flow linear regulating valve. When the salinity of the low-pressure seawater increases, the opening of the flow linear regulating valve decreases, and the flow of pressurized concentrated brine entering the turbine side inlet of the energy recovery device increases, the energy that can be recovered is more, and the low-pressure seawater is pressurized more; when the salinity of the low-pressure seawater decreases, the opening of the flow linear regulating valve increases, and the flow of pressurized concentrated brine entering the turbine side inlet of the energy recovery device decreases, the energy that can be recovered is less, and the low-pressure seawater is pressurized less. The frequency converter of the high-pressure pump, the salinity monitoring instrument, and the flow linear regulating valve work in real-time interaction through the intelligent controller to ensure the stability and efficiency of the system under variable working conditions.

[0014] In the description of the present invention, it should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0017] Figure 1 This is the process diagram of the utility model system;

[0018] In the figure: 1. Salinity monitoring instrument, 2. Remote flow meter, 3. Low pressure switch, 4. Remote pressure gauge, 5. Flow linear regulating valve

[0019] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0021] Example: Figure 1 As shown, a seawater desalination adaptive energy-saving system with an energy recovery device, low-pressure seawater enters the high-pressure pump inlet, the high-pressure pump outlet is connected to the pump side inlet of the energy recovery device, and the pump side outlet of the energy recovery device is connected to the reverse osmosis membrane group;

[0022] The outlet of the high-pressure pump is provided with a salinity monitoring instrument 1, a remote flow meter 2, and a low-pressure switch 3, and the outlet of the high-pressure pump is provided with a remote pressure gauge 4;

[0023] The pump side inlet and outlet of the energy recovery device are both provided with a remote pressure gauge 4, the turbine side inlet of the energy recovery device is provided with a remote pressure gauge 4, and the outlet is provided with a remote pressure gauge 4 and a remote flow meter 2;

[0024] The pressurized brine of the reverse osmosis membrane group is divided into two paths, one path enters the turbine side inlet of the energy recovery device, and the other path is a diversion pipeline equipped with a flow linear regulating valve 5 and a remote flow meter 2 for discharging concentrated water;

[0025] The salinity monitoring instrument 1, the low-pressure switch 3, the high-pressure pump, the flow linear regulating valve 5 and the intelligent controller are connected through a circuit;

[0026] The high-pressure pump is a high-pressure pump with a frequency converter.

[0027] In this embodiment, the intelligent controller can analyze the data collected by the salinity monitoring instrument 1 and control the opening and closing of the flow linear regulating valve 5. When the salinity of the low-pressure seawater increases, the opening of the flow linear regulating valve 5 decreases, and the flow rate of pressurized concentrated brine entering the turbine side inlet of the energy recovery device increases, the recoverable energy is more, and the low-pressure seawater is pressurized more; when the salinity of the low-pressure seawater decreases, the opening of the flow linear regulating valve 5 increases, the flow rate of pressurized concentrated brine entering the turbine side inlet of the energy recovery device decreases, the recoverable energy is less, and the low-pressure seawater is pressurized less. The frequency converter of the high-pressure pump and the salinity monitoring instrument 1 and the flow linear regulating valve 5 perform real-time interactive collaborative operations through the intelligent controller to ensure system stability and efficiency under variable working conditions.

[0028] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0029] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A seawater desalination adaptive energy-saving system with an energy recovery device, wherein the high-pressure pump outlet is connected to the pump side inlet of the energy recovery device, and the pump side outlet of the energy recovery device is connected to the reverse osmosis membrane group, characterized in that: The inlet end of the high-pressure pump is provided with a salinity monitoring instrument, a remote flow meter, and a low-pressure switch, and the outlet end of the high-pressure pump is provided with a remote pressure gauge; The pressurized brine of the reverse osmosis membrane group is divided into two paths, one path enters the turbine side inlet of the energy recovery device, and the other path is a diversion pipeline provided with a flow linear regulating valve and a remote flow meter for discharging the brine; The salinity monitoring instrument, low-pressure switch, high-pressure pump, flow linear regulating valve and intelligent controller are connected through a circuit; The high-pressure pump is a high-pressure pump with a frequency converter.

2. The seawater desalination adaptive energy-saving system with energy recovery device according to claim 1 is characterized in that: The pump side inlet and outlet of the energy recovery device are both provided with remote pressure gauges, the turbine side inlet of the energy recovery device is provided with a remote pressure gauge, and the outlet is provided with a remote pressure gauge and a remote flow meter.

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