CN217148919U

CN217148919U - A recycling system for circulating water blowdown water

Info

Publication number: CN217148919U
Application number: CN202221233106.2U
Authority: CN
Inventors: 李京芳; 张建坤
Original assignee: Grenzem New Water Co ltd
Current assignee: Grenzem New Water Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-08-09
Anticipated expiration: 2032-05-19

Abstract

The utility model discloses a recycling system for circulating water blowdown water, including high density sedimentation tank, MBR membrane device, reverse osmosis unit and sludge system, the outside of high density sedimentation tank is provided with the charge device subassembly, extend to the high density sedimentation tank through the pipeline in the charge device subassembly, the inside of high density sedimentation tank has set gradually before mix the pond, the flocculation basin, sedimentation tank and play basin, placed lime in the charge device subassembly, flocculating agent and coagulant aid, the online pH table in the mixed pond before the volume of adding of lime breast utilizes realizes automatic control, PH is between six and nine. The utility model adopts the lime and reinforced coagulation process, reduces the carbonate hardness of the circulating sewage, and simultaneously reduces the CO in the circulating waterD、SiO ₂ And (5) continuing to perform pre-desalination treatment on the circulating water sewage by adopting an MBR-RO process with equal content, wherein reverse osmosis produced water is recycled as a boiler make-up water source, and reverse osmosis concentrated water is recycled as water for a desulfurization process.

Description

A recycling system for circulating water blowdown water

Technical Field

The utility model belongs to a new technology of circulating water blowdown water retrieval and utilization relates to a high density pond, accurate grid pond, MBR pond, reverse osmosis treatment system, lime dosing system especially, uses in the processing and the recycle of power plant's circulating water blowdown water.

Background

At present, chemical water treatment of a power plant mostly adopts filtration, ultrafiltration and reverse osmosis processes, and discharge amounts of a filter, ultrafiltration backwashing water, reverse osmosis chemical washing, cleaning wastewater and the like are large, so that waste of water resources is caused on one hand, and environmental pollution is caused on the other hand. In order to meet the requirements of national and local environmental protection regulations and improve the utilization level of water resources, the water resources can be treated and recycled as a boiler makeup water source.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a recycling system for circulating water blowdown water adopts filtration, ultrafiltration, reverse osmosis process more in order to solve the chemical water treatment of power plant who proposes in the above-mentioned background art, and the filter and ultrafiltration backwash water, reverse osmosis chemistry are washed, the emission such as washing waste water is great, cause the waste of water resource on the one hand, and on the other hand causes environmental pollution's problem.

In order to achieve the above object, the utility model provides a following technical scheme: a recycling system for circulating water and sewage, which comprises a high-density sedimentation tank, an MBR membrane device, a reverse osmosis device and a sludge system, a dosing device assembly is arranged on the outer side of the high-density sedimentation tank, the dosing device assembly extends into the high-density sedimentation tank through a pipeline, the interior of the high-density sedimentation tank is sequentially provided with a front mixing tank, a flocculation tank, a sedimentation tank and a water outlet tank, lime, a flocculating agent and a coagulant aid are placed in the dosing device assembly, the addition amount of the lime is automatically controlled by utilizing an online pH meter in the pre-mixing tank, the pH is between six and nine, one side of the high-density sedimentation tank is provided with a precise grating tank and an MBR membrane device, the medicine adding device component is connected with the MBR membrane device through a pipeline, the MBR membrane device is connected with a fan through a pipeline, and the high-density sedimentation tank is connected with a lime feeding device through a pipeline.

Preferably, the MBR membrane device is connected with a filter through a pipeline, the right side of the filter is connected with a pump body through a raceway, and the pump body is connected with a reverse osmosis device through a pipeline.

Preferably, there is a water tank through the pipe connection among the reverse osmosis unit, there is demineralized water system through pump body and pipe connection on the water tank, there is a mud system through the pipe connection in the high density sedimentation tank.

Preferably, the play rivers of high density sedimentation tank rely on gravity to mix the pond before in proper order, mix pond, flocculation basin, sedimentation tank before, during the backward flow was collected in the basin then entered into accurate grid pond and MBR membrane device, select the MBR membrane that the water permeability is big, chemical stability is good, antipollution performance is good among the MBR membrane device, and the accurate grid is used in the preceding particle impurity of getting rid of MBR device, prevents fish tail, the stifled membrane element of pollution, ensures the safe operation of follow-up system, and the MBR membrane further reduces aquatic turbidity, satisfies the requirement that reverse osmosis intake.

Preferably, the dosing device assembly comprises a lime dosing device, a sulfuric acid dosing device, a flocculating agent dosing device, a coagulant aid dosing device, a reducing agent dosing device and a scale inhibitor dosing device.

Preferably, the lime dosing device in the dosing device assembly is of a full-sealing structure, the top of the lime dosing device assembly is provided with a dust removal device, the bottom of the lime dosing device assembly is provided with a vibration hopper and is connected with a lime quantitative feeding device, and the dust removal device removes dust.

Compared with the prior art, the beneficial effects of the utility model are that: this a recycling system for circulating water blowdown water is rational in infrastructure, has following advantage:

(1) the lime and reinforced coagulation process is adopted, so that the carbonate hardness of the circulating sewage is reduced, and COD and SiO in the circulating water are reduced ₂ And (5) continuing to perform pre-desalination treatment on the circulating water sewage by adopting an MBR-RO process with equal content, wherein reverse osmosis produced water is recycled as a boiler make-up water source, and reverse osmosis concentrated water is recycled as water for a desulfurization process.

(2) Through being provided with accurate grid pond, accurate grid pond is in MBR membrane device's the place ahead, and particle impurity is got rid of in accurate grid pond, prevents fish tail, dirty stifled membrane element, ensures follow-up system's safe operation, and MBR membrane device chooses for use that the water permeability is big, chemical stability is good, the good MBR membrane of antipollution performance, further reduces aquatic turbidity, satisfies the requirement of reverse osmosis intaking.

(3) The system simplifies the process flow, can reduce the floor area of equipment, can save the equipment investment, has good effluent quality and high treatment efficiency when being used for treating the circulating water and sewage, and can meet the water quality requirements of a plurality of water consumption points.

Drawings

Fig. 1 is a schematic front view of the present invention;

in the figure: 1. a high-density sedimentation tank; 2. a precision grid cell; 3. an MBR membrane unit; 4. a reverse osmosis unit; 5. a lime adding device; 6. a sludge system; 7. a dosing device assembly; 8. a pump body; 9. a fan; 10. a filter; 11. a desalination water system; 12. a water tank.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.

Referring to fig. 1, the present invention provides an embodiment: a recycling system for circulating water sewage comprises a high-density sedimentation tank 1, an MBR membrane device 3, a reverse osmosis device 4 and a sludge system 6, wherein a medicine adding device component 7 is arranged on the outer side of the high-density sedimentation tank 1, the medicine adding device component 7 extends into the high-density sedimentation tank 1 through a pipeline, various medicines are added into the high-density sedimentation tank 1 through the medicine adding device component 7, a front mixing tank, a flocculation tank, a sedimentation tank and a water outlet tank are sequentially arranged in the high-density sedimentation tank 1, the front mixing tank enables the medicines to be mixed with wastewater, the flocculation tank has the function of precipitating impurities, lime, a flocculating agent and a coagulant aid are placed in the medicine adding device component 7, the adding amount of the lime utilizes an online pH meter in the front mixing tank to realize automatic control, the pH is between six and nine, a precise grid tank 2 and an MBR membrane device 3 are arranged on one side of the high-density sedimentation tank 1, the drug adding device assembly 7 is mutually connected with the MBR membrane device 3 through a pipeline, the MBR membrane device 3 is connected with a fan 9 through a pipeline, and the high-density sedimentation tank 1 is connected with a lime adding device 5 through a pipeline;

the lime and reinforced coagulation process is adopted, so that the carbonate hardness of the circulating sewage is reduced, and COD and SiO in the circulating water are reduced ₂ When the content is equal, the MBR-RO process is continuously adopted to carry out pre-desalination treatment on the circulating water and sewage, the reverse osmosis produced water is recycled as a boiler make-up water source, and the reverse osmosis concentrated water is recycled as water for the desulfurization process;

the MBR membrane device 3 is connected with a filter 10 through a pipeline, the right side of the filter 10 is connected with a pump body 8 through a raceway, the pump body 8 is connected with a reverse osmosis device 4 through a pipeline, a water tank 12 is connected in the reverse osmosis device 4 through a pipeline, the water tank 12 is connected with a desalination water system 11 through the pump body 8 and a pipeline, and the high-density sedimentation tank 1 is connected with a sludge system 6 through a pipeline;

the water flow of the high-density sedimentation tank 1 sequentially passes through the front mixing tank, the flocculation tank and the sedimentation tank by virtue of gravity, flows back to the water outlet tank and then enters the precision grating tank 2 and the MBR membrane device 3, the precision grating is used in front of the MBR device to remove particle impurities, prevent scratching and fouling membrane elements and ensure the safe operation of subsequent systems, the MBR membrane device 3 is selected with an MBR membrane with large water permeability, good chemical stability and good anti-pollution performance, the dosing device component 7 comprises a lime dosing device, a sulfuric acid dosing device, a flocculating agent dosing device, a coagulant aid dosing device, a reducing agent dosing device and a scale inhibitor dosing device, the lime dosing device in the dosing device component 7 is of a full-sealing structure, the top of the dosing device is provided with a dust removal device, the bottom of the dosing device is provided with a vibration hopper, the vibration hopper discharges lime and is connected with a lime quantitative dosing device, the dust removal device performs the dust removal function;

the precise grating tank 2 is arranged in front of the MBR membrane device 3, the precise grating tank 2 removes particle impurities, so that membrane elements are prevented from being scratched and polluted, the safe operation of a subsequent system is guaranteed, and the MBR membrane device 3 selects an MBR membrane with large water permeability, good chemical stability and good pollution resistance, so that the turbidity in water is further reduced, and the requirement of reverse osmosis water inflow is met;

the system simplifies the process flow, can reduce the floor area of equipment, can save the equipment investment, has good effluent quality and high treatment efficiency when being used for treating the circulating water and sewage, and can meet the water quality requirements of a plurality of water consumption points.

This application embodiment is when using, through letting in water to high density sedimentation tank 1 in, then add lime, flocculating agent and other medicaments through charge device subassembly 7, then adopt lime + intensive coagulation technology, reduced the carbonate hardness of circulating water blowdown water, reduced COD, SiO in the circulating water simultaneously, SiO ₂ The content is equal, MBR-RO process is continuously adopted to carry out pre-desalination treatment on the circulating water and sewage, reverse osmosis produced water is recycled as a boiler make-up water source, reverse osmosis concentrated water is recycled as water for desulfurization process, then the water flows sequentially pass through a front mixing tank, a flocculation tank and a sedimentation tank under the action of gravity, flows back and is collected into a water outlet tank and then enters a precision grating tank 2 and an MBR membrane device 3, the precision grating tank 2 is arranged in front of the MBR membrane device 3, the precision grating tank 2 removes particle impurities, membrane elements are prevented from being scratched and polluted and the safe operation of a subsequent system is ensured, the MBR membrane device 3 selects an MBR membrane with large water permeability, good chemical stability and good pollution resistance, the turbidity in water is further reduced, the requirement of reverse osmosis inlet water is met, then the water enters a filter 10 to filter the impurities, and then the water enters a reverse osmosis membrane device 4 to be filtered, the sludge is treated by a sludge system 6 and then desalinated by a desalinated water system 11.

Claims

1. The utility model provides a recycling system for circulating water blowdown water which characterized in that: the device comprises a high-density sedimentation tank (1), an MBR (membrane bioreactor) device (3), a reverse osmosis device (4) and a sludge system (6), wherein a medicine adding device component (7) is arranged on the outer side of the high-density sedimentation tank (1), the medicine adding device component (7) extends into the high-density sedimentation tank (1) through a pipeline, a front mixing tank, a flocculation tank, a sedimentation tank and a water outlet tank are sequentially arranged inside the high-density sedimentation tank (1), lime, a flocculating agent and a coagulant aid are placed in the medicine adding device component (7), the adding amount of the lime is automatically controlled by using an on-line pH meter in the front mixing tank, the PH is between six and nine, a precise MBR (MBR) grid tank (2) and the MBR (3) are arranged on one side of the high-density sedimentation tank (1), the medicine adding device component (7) is mutually connected with the MBR (3) through a pipeline, a fan (9) is connected onto the MBR (3) through a pipeline, the high-density sedimentation tank (1) is connected with a lime feeding device (5) through a pipeline.

2. The recycling system for circulating sewage of claim 1, which is characterized in that: the MBR membrane device (3) is connected with a filter (10) through a pipeline, the right side of the filter (10) is connected with a pump body (8) through a roller path, and the pump body (8) is connected with a reverse osmosis device (4) through a pipeline.

3. The recycling system for circulating sewage of claim 1, which is characterized in that: there is water tank (12) through the pipe connection in reverse osmosis unit (4), there is demineralized water system (11) through pump body (8) and pipe connection on water tank (12), there is mud system (6) through the pipe connection in high density sedimentation tank (1).

4. The recycling system for circulating sewage of claim 1, which is characterized in that: the effluent water flow of the high-density sedimentation tank (1) sequentially passes through a front mixing tank, a flocculation tank and a sedimentation tank by means of gravity, flows back to collect an effluent trough and then enters into a precise grid tank (2) and an MBR membrane device (3), and an MBR membrane with large water permeation amount, good chemical stability and good pollution resistance is selected from the MBR membrane device (3).

5. The recycling system for circulating sewage of claim 1, which is characterized in that: the dosing device assembly (7) comprises a lime dosing device, a sulfuric acid dosing device, a flocculating agent dosing device, a coagulant aid dosing device, a reducing agent dosing device and a scale inhibitor dosing device.

6. The recycling system for circulating sewage of claim 1, which is characterized in that: the lime dosing device in the dosing device assembly (7) is of a full-sealing structure, the top of the lime dosing device is provided with a dust removal device, and the bottom of the lime dosing device is provided with a vibration hopper and is connected with a lime quantitative feeding device.