A boiler make-up water high-efficiency purification equipment based on reverse osmosis technology

Abstract

The utility model discloses a kind of boiler make-up water efficient purification equipment based on reverse osmosis technology, belong to chemical water treatment equipment technical field, for how to reduce the concentrated drainage volume of reverse osmosis device is to ensure that the whole plant wastewater is not discharged and adopts calcium carbide slag slurry desulfurization problem, including three-stage reverse osmosis mechanism and concentrated water reverse osmosis mechanism, the three-stage reverse osmosis mechanism transforms raw water reverse osmosis device into one level three sections, i.

Description

Technical Field

[0001] This utility model belongs to the technical field of chemical water treatment equipment, specifically relating to a high-efficiency purification device for boiler feedwater based on reverse osmosis technology. Background Technology

[0002] Wastewater from process equipment such as reverse osmosis units, cation and anion beds, mixed beds, condensate treatment systems, and cleaning devices in the chemical water treatment workshop is mixed and discharged into two neutralization tanks via drainage ditches. Wastewater from activated carbon filters, multi-media filters, and ultrafiltration units is mixed and discharged into the industrial wastewater treatment workshop via drainage ditches.

[0003] The wastewater generated by the existing chemical water treatment workshop is classified into three categories: high-salinity, low-turbidity water; low-turbidity, low-salinity water; and high-turbidity, low-salinity water. These three types of wastewater are not being reused in full accordance with the principles of "tiered water supply, cascaded use, and classified wastewater recycling." Low-turbidity, low-salinity water can be directly reused in the chemical water treatment raw water tank; high-salinity, low-turbidity water can be reused in the desulfurization process; and high-turbidity, low-salinity water is recycled to the industrial wastewater system.

[0004] Currently, the chemical water treatment workshop has two reverse osmosis units with a designed water production capacity of 105t / h. The current operating water production capacity is about 102t / h, the concentrated wastewater volume is about 38t / h, and the concentrated wastewater salinity (TDS) is about 1500mg / L. This wastewater can be reused in the desulfurization system and boiler acid washing wastewater pond.

[0005] The largest source of high-salinity wastewater is the concentrated discharge from the reverse osmosis unit in the chemical water treatment workshop. The larger the volume of demineralized water and fresh water produced in the water treatment workshop, the larger the volume of concentrated discharge. Therefore, reducing the volume of concentrated discharge from the reverse osmosis unit is a key issue in ensuring that no wastewater is discharged from the entire plant and in utilizing calcium carbide slag slurry for desulfurization. Currently, the original reverse osmosis unit is designed and operated as a single-stage, two-section system. The process flow diagram is attached. Figure 1 There are two reverse osmosis units with a design output of 105 t / h each, each equipped with 144 membrane elements and a membrane flux design value of 18.11 L / m².h. The high-pressure pump has a design output of 140 t / h and a design head of 1.2 MPa. In actual operation, the high-pressure pump output is 140 t / h and the head is 1.1 MPa, so the actual reverse osmosis output is approximately 98 t / h.

[0006] Therefore, a high-efficiency boiler feedwater purification device based on reverse osmosis technology is needed to solve the problems in existing technologies, such as how to reduce the concentrated discharge of the reverse osmosis unit to ensure that no wastewater is discharged from the plant and how to use calcium carbide slag slurry for desulfurization. Utility Model Content

[0007] The purpose of this invention is to provide a high-efficiency boiler feedwater purification device based on reverse osmosis technology to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency boiler feedwater purification device based on reverse osmosis technology, comprising a three-stage reverse osmosis mechanism and a concentrate reverse osmosis mechanism. The three-stage reverse osmosis mechanism modifies the raw water reverse osmosis device into a single-stage three-stage system, that is, each set of reverse osmosis devices is augmented with an additional stage. The concentrate reverse osmosis mechanism collects the concentrate from the two sets of reverse osmosis devices and adds a concentrate reverse osmosis stage. The concentrate reverse osmosis mechanism is arranged above the frame of the raw water reverse osmosis device and reinforces the columns of the raw water reverse osmosis frame.

[0009] It should be noted in the scheme that the three-stage reverse osmosis mechanism includes adding a stage to the reverse osmosis body of the raw water reverse osmosis device to form a first-stage three-stage reverse osmosis, and adding two inter-stage booster pumps, which are respectively arranged between the reverse osmosis and ultrafiltration. The three-stage reverse osmosis mechanism adds two sets of three-stage reverse osmosis, and membrane elements and pressure vessels are installed on the three-stage reverse osmosis mechanism.

[0010] It is worth noting that the membrane elements in the three-stage reverse osmosis mechanism are increased by 30 compared to the raw water reverse osmosis device, and there are 5 pressure vessels arranged on the existing reverse osmosis membrane frame.

[0011] Furthermore, it should be noted that the concentrate reverse osmosis unit includes a reverse osmosis concentrate tank, a reverse osmosis concentrate booster pump, a security filter, a concentrate reverse osmosis high-pressure pump, a concentrate reverse osmosis device, and a dosing metering device, which are newly installed on the raw water reverse osmosis device. The reverse osmosis concentrate tank is located on the south side of the outdoor chemical water tank of the raw water reverse osmosis device. The reverse osmosis concentrate booster pump is located next to the ultrafiltration water pump in the pump room. The security filter and the concentrate reverse osmosis high-pressure pump are located next to the iron removal filter in the water treatment workshop.

[0012] In a preferred embodiment, the dosing device includes a scale inhibitor and non-oxidizing bactericide dosing device, a reducing agent dosing device, and a hydrochloric acid dosing device. The scale inhibitor and non-oxidizing bactericide dosing device is arranged in the dosing room, the reducing agent dosing device is an extension of the original device, and the hydrochloric acid dosing device is arranged in the acid-base dosing room.

[0013] Compared with the prior art, the boiler feedwater high-efficiency purification equipment based on reverse osmosis technology provided by this utility model has at least the following beneficial effects:

[0014] (1) By adding a section to each original reverse osmosis unit through a three-stage reverse osmosis mechanism, the existing first-stage two-stage reverse osmosis is transformed into a first-stage three-stage reverse osmosis. Two inter-stage booster pumps are added and arranged between the reverse osmosis and ultrafiltration respectively. Two sets of three-stage reverse osmosis are added, with the membrane element flux designed according to 19L / m².h. Each set adds 30 membrane elements and five pressure vessels, which are arranged on the existing reverse osmosis membrane frame, adding 1 layer and 2 layers in some areas. With the two sets of reverse osmosis fully operational, the concentrated wastewater can be recycled to produce more than 35t / h of fresh water, reducing the high-salt wastewater by 35t / h.

[0015] (2) The concentrated water reverse osmosis mechanism is flexible in operation. It collects concentrated water through a tank and sets up antiscalant dosing points in the concentrated water reverse osmosis feed pipe, which can effectively mitigate the risk of scaling. The recovery rate can reach more than 60% and can reach up to 70% through the arrangement of membrane elements. Cleaning or maintenance of the equipment will not affect the normal operation of the original reverse osmosis. Attached Figure Description

[0016] Figure 1 A schematic diagram of the existing two-stage reverse osmosis unit process flow;

[0017] Figure 2 This is a schematic diagram of the process flow structure of Embodiment 1 of this utility model;

[0018] Figure 3 This is a schematic diagram of the process flow structure of Embodiment 2 of this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments.

[0020] Please see Figure 2-3 This utility model provides a high-efficiency boiler feedwater purification device based on reverse osmosis technology, including a three-stage reverse osmosis mechanism and a concentrate reverse osmosis mechanism. The three-stage reverse osmosis mechanism modifies the raw water reverse osmosis device into a single-stage three-stage device, that is, each reverse osmosis device adds one stage. The concentrate reverse osmosis mechanism collects the concentrate from the two reverse osmosis devices and adds a concentrate reverse osmosis device. The concentrate reverse osmosis mechanism is arranged above the frame of the raw water reverse osmosis device and the columns of the raw water reverse osmosis frame are reinforced.

[0021] Example 1

[0022] Further as Figure 2As shown, it is worth noting that the three-stage reverse osmosis mechanism includes adding a stage to the reverse osmosis body of the raw water reverse osmosis unit to form a first-stage three-stage reverse osmosis, and adding two inter-stage booster pumps, which are respectively arranged between the reverse osmosis and ultrafiltration. The three-stage reverse osmosis mechanism adds two sets of three-stage reverse osmosis, and membrane elements and pressure vessels are installed on the three-stage reverse osmosis mechanism. The three-stage reverse osmosis mechanism adds 30 membrane elements compared to the raw water reverse osmosis unit, and there are 5 pressure vessels, which are arranged on the existing reverse osmosis membrane frame.

[0023] There are two existing reverse osmosis (RO) units with a design output of 105 t / h, each equipped with 144 membrane elements and a designed membrane flux of 18.11 L / m².h. The high-pressure pump has a designed output of 140 t / h and a designed head of 1.2 MPa. In actual operation, the high-pressure pump output is 140 t / h and the head is 1.1 MPa, resulting in an actual RO output of approximately 98 t / h. In this embodiment, an additional stage is added to each RO unit, transforming the existing two-stage RO system into a three-stage system. Two inter-stage booster pumps are added, positioned between the RO and ultrafiltration stages respectively. Two additional three-stage RO systems are also added, with a membrane element flux designed at 19 L / m².h. Each system adds 30 membrane elements and five pressure vessels, arranged on the existing RO membrane frame, with one additional layer and two layers in some areas. In this embodiment, both RO units, when fully operational, can recover concentrated wastewater to produce more than 35 t / h of freshwater, reducing high-salinity wastewater by 35 t / h.

[0024] This embodiment has the following working process: Raw water first enters the existing reverse osmosis unit for preliminary reverse osmosis treatment. After passing through the first-stage two-stage reverse osmosis, it enters the newly added inter-stage booster pump for pressure boosting, and then enters the newly added third-stage reverse osmosis for advanced treatment. In the three-stage reverse osmosis process, the membrane element flux is designed according to 19L / m².h, which can effectively improve the freshwater production efficiency. The freshwater after the three-stage reverse osmosis treatment enters the subsequent treatment stage, while the concentrate enters the concentrate reverse osmosis unit. The concentrate first enters the reverse osmosis concentrate tank for collection, and then is boosted to the security filter by the reverse osmosis concentrate booster pump for preliminary filtration, and then passes through the concentrate reverse osmosis unit. The high-pressure permeate pump enters the concentrate reverse osmosis unit for further treatment. During the concentrate reverse osmosis process, the recovery rate is over 60%, and can reach up to 70%, through the arrangement of membrane elements, effectively reducing the discharge of high-salinity wastewater. At the same time, scale inhibitor dosing points are set in the concentrate reverse osmosis feed pipe to effectively mitigate the risk of scaling. In addition, scale inhibitor and non-oxidizing bactericide dosing devices, reducing agent dosing devices, and hydrochloric acid dosing devices in the dosing metering system are arranged in corresponding positions to ensure the normal operation of the equipment and the accurate dosing of chemical agents. The entire equipment operates flexibly, and cleaning or maintenance of the equipment does not affect the normal operation of the original reverse osmosis system.

[0025] Example 2

[0026] Further as Figure 3 As shown, it is worth noting that the concentrated water reverse osmosis system includes a reverse osmosis concentrated water tank, a reverse osmosis concentrated water booster pump, a security filter, a concentrated water reverse osmosis high-pressure pump, a concentrated water reverse osmosis unit, and a dosing and metering device. These are newly installed on the raw water reverse osmosis unit. The reverse osmosis concentrated water tank is located south of the outdoor chemical water tank of the raw water reverse osmosis unit. The reverse osmosis concentrated water booster pump is located next to the ultrafiltration water pump in the pump room. The security filter and the concentrated water reverse osmosis high-pressure pump are located next to the iron removal filter in the water treatment workshop. The dosing and metering device includes a scale inhibitor and non-oxidizing bactericide dosing device, a reducing agent dosing device, and a hydrochloric acid dosing device. The scale inhibitor and non-oxidizing bactericide dosing device is located in the dosing and metering room. The reducing agent dosing device is an extension of the original unit. The hydrochloric acid dosing device is located in the acid and alkali metering room.

[0027] This embodiment involves constructing a new concentrated water reverse osmosis (RO) unit, comprising a 300m³ RO concentrated water tank, a RO concentrated water booster pump, a security filter, a concentrated water RO high-pressure pump, and a concentrated water RO unit. The newly constructed concentrated water RO unit treats the RO wastewater, further concentrating it. The treated permeate (freshwater) is added to the freshwater tank, while the deeply concentrated saline wastewater is discharged to the south-side chemical water treatment neutralization tank. The process flow is as follows: raw water RO wastewater → concentrated water recovery tank → concentrated water booster pump → concentrated water security filter → concentrated water high-pressure pump → concentrated water RO unit → freshwater tank. Specifically, the membrane element flux is designed to be less than 20L / m².h, with a treatment capacity of 75m³ / h. The concentrated water RO unit is designed in two sections, with 13 pressure vessels arranged in a 9:4 ratio, housing 78 membrane elements. In this embodiment, the unit is installed on an existing RO membrane frame, with four additional layers. The bottom layer is a pipe arrangement interlayer, and the upper three layers house the membrane shells.

[0028] This embodiment has the following working process: After the raw water is treated by reverse osmosis, concentrated water is discharged. This concentrated water first enters the concentrated water recovery tank for storage. Then, the concentrated water is transported to the concentrated water security filter by the concentrated water booster pump. During this process, larger particulate impurities are intercepted to ensure the stability of subsequent treatment. Next, the concentrated water is pressurized by the concentrated water high-pressure pump and enters the concentrated water reverse osmosis unit. Inside the unit, through the selective permeability of the membrane element, water molecules pass through the membrane to become fresh water, while impurities such as salt are intercepted, achieving deep concentration of the concentrated water. The treated fresh water is transported to the fresh water tank as a supplementary water source for boiler feedwater, while the deeply concentrated saline wastewater is discharged to the chemical water treatment neutralization tank on the south side for further treatment. Throughout the entire operation, the membrane element flux is designed to be less than 20 L / m².h to ensure stable and reliable treatment effect. At the same time, the concentrated water reverse osmosis unit is designed in two stages, with 13 pressure vessels arranged in a 9:4 ratio, containing 78 membrane elements to achieve high-efficiency water treatment capacity.

[0029] In summary: By adding a stage to each existing reverse osmosis unit using a three-stage reverse osmosis system, essentially transforming the existing single-stage, two-stage reverse osmosis system into a single-stage, three-stage system, two inter-stage booster pumps are added, one positioned between the reverse osmosis and ultrafiltration units. Two additional three-stage reverse osmosis units are added, with membrane element flux designed at 19 L / m².h. Each unit adds 30 membrane elements and five pressure vessels, arranged on the existing reverse osmosis membrane rack, adding one layer (and locally two layers). With both reverse osmosis units fully operational, this scheme can recover concentrate wastewater to produce over 35 t / h of freshwater, reducing high-salinity wastewater by 35 t / h. The concentrate reverse osmosis mechanism offers flexible operation. Concentrate is collected in a tank, and an antiscalant dosing point is installed in the concentrate reverse osmosis feed pipe to effectively mitigate scaling risks. The membrane element arrangement achieves a recovery rate of over 60%, with a maximum recovery rate of 70%. Equipment cleaning or maintenance does not affect the normal operation of the original reverse osmosis system.

Claims

1. A high-efficiency boiler feedwater purification device based on reverse osmosis technology, characterized in that: It includes a three-stage reverse osmosis mechanism and a concentrate reverse osmosis mechanism. The three-stage reverse osmosis mechanism transforms the raw water reverse osmosis device into a single-stage three-stage device, that is, each reverse osmosis device adds one stage. The concentrate reverse osmosis mechanism collects the concentrate from the two reverse osmosis devices and adds a concentrate reverse osmosis system. The concentrate reverse osmosis mechanism is arranged above the raw water reverse osmosis device frame and reinforces the raw water reverse osmosis frame columns.

2. The high-efficiency boiler feedwater purification equipment based on reverse osmosis technology according to claim 1, characterized in that: The three-stage reverse osmosis mechanism includes adding a stage to the reverse osmosis body of the raw water reverse osmosis device to form a first-stage three-stage reverse osmosis, and adding two inter-stage booster pumps, which are respectively arranged between the reverse osmosis and ultrafiltration. The three-stage reverse osmosis mechanism is equipped with two sets of three-stage reverse osmosis, and membrane elements and pressure vessels are installed on the three-stage reverse osmosis mechanism.

3. The high-efficiency boiler feedwater purification equipment based on reverse osmosis technology according to claim 2, characterized in that: The membrane elements are increased by 30 compared to the raw water reverse osmosis device in the three-stage reverse osmosis mechanism, and there are 5 pressure vessels arranged on the existing reverse osmosis membrane frame.

4. The high-efficiency boiler feedwater purification equipment based on reverse osmosis technology according to claim 1, characterized in that: The concentrated water reverse osmosis unit includes a reverse osmosis concentrated water tank, a reverse osmosis concentrated water booster pump, a security filter, a concentrated water reverse osmosis high-pressure pump, a concentrated water reverse osmosis device, and a dosing metering device, which are newly installed on the raw water reverse osmosis device. The reverse osmosis concentrated water tank is located on the south side of the outdoor chemical water tank of the raw water reverse osmosis device. The reverse osmosis concentrated water booster pump is located next to the ultrafiltration water pump in the pump room. The security filter and the concentrated water reverse osmosis high-pressure pump are located next to the iron removal filter in the water treatment workshop.

5. The high-efficiency boiler feedwater purification equipment based on reverse osmosis technology according to claim 4, characterized in that: The dosing and metering device includes a scale inhibitor and non-oxidizing bactericide dosing device, a reducing agent dosing device, and a hydrochloric acid dosing device. The scale inhibitor and non-oxidizing bactericide dosing device is arranged in the dosing and metering room, the reducing agent dosing device is an extension of the original device, and the hydrochloric acid dosing device is arranged in the acid and alkali metering room.

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