CN218434954U

CN218434954U - Water treatment system for wet-type electric dust removal equipment of converter

Info

Publication number: CN218434954U
Application number: CN202222009698.6U
Authority: CN
Inventors: 蒋涂彪; 刘惠; 林女玉; 丁曦; 朱玉红; 谌彦; 刘勇; 褚宏怡
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2023-02-03
Anticipated expiration: 2032-08-01

Abstract

The utility model relates to a water treatment system for converter wet-type electrostatic precipitator equipment belongs to industrial water treatment technical field. The water treatment system comprises a circulating water treatment system and a muddy water treatment system, wherein the circulating water treatment system comprises a hot water tank, a shallow sand filter and a cooling tower which are sequentially arranged along the flowing direction of the backwater discharged by the converter wet-type electric precipitation equipment; the mud water treatment system comprises a backwash water regulating reservoir, a mud pump, a plate-and-frame filter press and a dosing device, wherein the backwash water regulating reservoir is connected with a shallow sand filter to receive backwash drainage in the shallow sand filter, the backwash water regulating reservoir is provided with a mud outlet located at the bottom of the backwash water regulating reservoir and a supernatant outlet located at the top of the backwash water regulating reservoir, one end of the mud pump is connected with the mud outlet, the other end of the mud pump is connected with the plate-and-frame filter press, the supernatant outlet is connected with the hot water tank, and the dosing device is connected with the backwash water regulating reservoir to add a flocculating agent into the backwash water regulating reservoir.

Description

Water treatment system for wet-type electric dust removal equipment of converter

Technical Field

The utility model belongs to the technical field of industrial water treatment, a water treatment system for converter wet-type electrostatic precipitator is related to.

Background

In order to meet increasingly stringent environmental requirements, steel mills are increasingly beginning to install converter wet electric dust removal equipment behind converter dry dust removers. Converter wet-type electrostatic precipitator needs a large amount of water to be used for spray cooling coal gas and washes the dust of deposit on the dust collecting plate, and discharged return water can the temperature rise after converter wet-type electrostatic precipitator uses to aquatic suspended solid concentration increases, if improper cooling effect that will appear converter wet-type electrostatic precipitator is poor, shower nozzle scale deposit blocks up scheduling problem, influences coal gas recycle efficiency. The conventional treatment process of circulating water of the existing dust removing equipment comprises the following steps: backwater → hot water tank → filtration/sedimentation → cooling → cold water tank → user, mud water treatment process of filtration/sedimentation: muddy water → adjustment → multi-stage concentration → sludge conditioning → solid-liquid separation → mud cake outward transportation. The treatment process is long, more building structures need to be newly built, the occupied area is large, and the later-stage operation and maintenance cost is high. However, in the scheme of the main mining area of the steel plant at present, a converter wet-type electric precipitation system is additionally arranged on the basis of the existing dust removal system, so that the construction land area is small, and the water treatment system for the converter wet-type electric precipitation equipment in the prior art cannot well meet the project construction requirements.

Therefore, there is an urgent need for a new water treatment system for a wet-type electric dust removal device of a converter, which has a shorter water treatment process than the water treatment system of the prior art and occupies a smaller area.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a water treatment system for a wet-type electric dust removal device of a converter, which has a shorter water treatment process than the water treatment system of the prior art and occupies a smaller area.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a water treatment system for converter wet-type electric precipitation equipment comprises a circulating water treatment system and a muddy water treatment system, wherein the circulating water treatment system comprises a hot water tank, a shallow sand filter and a cooling tower which are sequentially arranged along the flowing direction of backwater discharged by the converter wet-type electric precipitation equipment;

the mud water treatment system is composed of a backwash water adjusting tank, a mud pump, a plate-and-frame filter press and a dosing device, wherein the backwash water adjusting tank is connected with the shallow sand filter to receive backwash drainage in the shallow sand filter, the backwash water adjusting tank is provided with a mud outlet located at the bottom of the backwash water adjusting tank and a supernatant outlet located at the top of the backwash water adjusting tank, one end of the mud pump is connected with the mud outlet, the other end of the mud pump is connected with the plate-and-frame filter press, the supernatant outlet is connected with the hot water tank, and the dosing device is connected with the backwash water adjusting tank to add a flocculating agent into the backwash water adjusting tank.

Further, a filtrate pipeline is arranged between the plate-and-frame filter press and the backwashing water regulating tank.

Further, a hot water upper tower pump for pressurizing and lifting the discharged return water in the hot water tank is arranged between the hot water tank and the shallow sand filter.

Further, one side of the shallow sand filter is provided with a bypass pipeline, one end of the bypass pipeline is connected with a hot water upper tower pump, one end of the bypass pipeline is connected with a cooling tower, and the bypass pipeline is provided with a switch valve.

Furthermore, the hot water tank is divided into two grids through a partition wall arranged in the hot water tank, and a square gate valve is arranged on the partition wall.

Furthermore, the hot water tower pump is respectively connected with the two grids of the hot water pool.

Further, the cooling tower is a glass fiber reinforced plastic counter-flow cooling tower.

Further, a cold water pool is arranged between the cooling tower and the converter wet-type electric precipitation equipment.

Further, a water supply pump is arranged between the cold water tank and the converter wet-type electric precipitation equipment.

Further, the effective volume of the backwashing water regulating tank is not less than the primary feeding amount of the plate-and-frame filter press.

The beneficial effects of the utility model reside in that:

1. the utility model discloses characteristic that discharge return water dust content is not high to converter wet-type electrostatic precipitator, add the flocculating agent in to backwash water equalizing basin through charge device, can solve the problem that the suspended solid subsides the difficulty because of the particle diameter is little in the waste water effectively, the concentration of backwash water equalizing basin bottom mud has been improved, be favorable to the dehydration of plate and frame filter press, and the concentration of mud, the quenching and tempering is all accomplished in backwash water equalizing basin, need not additionally to build concentrated pond, thereby realized that the flow is shorter, the purpose that the construction takes up an area of still less, can reduce wet-type electric dedusting water processing system's investment and running cost.

2. The utility model adopts the partition wall to divide the hot water tank, which is beneficial to cleaning the sludge at the bottom of the hot water tank at regular time without influencing the operation of the whole wet electric dust removal system; arranging a bypass pipeline to ensure that the converter wet-type electric dust removal system can normally run during maintenance of the shallow sand filter; supernatant in the backwashing water regulating tank automatically flows back to the hot water tank through a supernatant outlet for recycling, filtrate in the plate-and-frame filter press flows back to the backwashing water regulating tank through a filtrate pipeline, so that the amount of discharged water is reduced, and the reuse rate of water for a converter wet-type electric dust removal system is improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a water treatment system for a converter wet-type electric precipitation device.

Reference numerals: the system comprises a hot water pool 1, a hot water upper tower pump 2, a shallow sand filter 3, a cooling tower 4, a cold water pool 5, a water supply pump 6, a backwash water regulating pool 7, a slurry outlet 71, a supernatant outlet 72, a slurry pump 8, a plate-and-frame filter press 9, a dosing device 10, a filtrate pipeline 11, a bypass pipeline 12, a switch valve 13 and a partition wall 14.

Detailed Description

The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Referring to fig. 1, the water treatment system for the wet-type electric dust removal equipment of the converter comprises a circulating water treatment system and a muddy water treatment system, wherein the circulating water treatment system comprises a hot water tank 1, a shallow sand filter 3 and a cooling tower 4 which are sequentially arranged along the flowing direction of the backwater discharged by the wet-type electric dust removal equipment of the converter; the mud water treatment system is composed of a backwash water regulating tank 7, a mud pump 8, a plate-and-frame filter press 9 and a dosing device 10, wherein the backwash water regulating tank 7 is connected with the shallow sand filter 3 to receive backwash drainage in the shallow sand filter 3, the backwash water regulating tank 7 is provided with a mud outlet 71 located at the bottom of the backwash water regulating tank 7 and a supernatant outlet 72 located at the top of the backwash water regulating tank 7, one end of the mud pump 8 is connected with the mud outlet 71, the other end of the mud pump is connected with the plate-and-frame filter press 9, the supernatant outlet 72 is connected with the hot water tank 1, and the dosing device 10 is connected with the backwash water regulating tank 7 to add a flocculating agent into the backwash water regulating tank 7.

In this scheme, filter press 9 with be equipped with filtrating pipeline 11 between the backwash water equalizing basin 7, hot-water basin 1 with be equipped with between shallow layer sand filter 3 and be arranged in the hot water tower pump 2 on the hot water that promotes the discharge return water pressurization in the hot-water basin 1 one side of shallow layer sand filter 3 is equipped with by-pass line 12, by-pass line 12 one end connects hot water tower pump 2 on, and cooling tower 4 is connected to one end, just be equipped with ooff valve 13 on the by-pass line 12.

In the scheme, the hot water tank 1 is divided into two grids through a partition wall 14 arranged in the hot water tank 1, a square gate valve is arranged on the partition wall 14, and the hot water upper tower pump 2 is respectively connected with the two grids of the hot water tank 1.

In the scheme, the cooling tower 4 and a cold water tank 5 is arranged between the converter wet-type electric dust removal equipment, and a water supply pump 6 is arranged between the cold water tank 5 and the converter wet-type electric dust removal equipment.

Specifically, the effective volume of the backwash water regulating tank 7 is not less than the primary feeding amount of the plate-and-frame filter press 9, and the cooling tower 4 is a glass fiber reinforced plastic counter-flow cooling tower 4.

The water treatment system for the wet-type electric dust removal equipment of the converter provided by the scheme has the following specific treatment steps and setting requirements:

1) Discharged return water used by the converter wet-type electric precipitation equipment automatically flows into a hot water tank 1, is pressurized and sent into a shallow sand filter 3 by a hot water upper tower pump 2 for full filtration, the filtered water is cooled by a cooling tower 4 by using residual pressure, the discharged return water enters a cold water tank 5 after being cooled, and is pressurized by a water supply pump 6 for recycling of the converter wet-type electric precipitation equipment; during the maintenance period of the shallow sand filter 3, all return water passes through the bypass pipeline 12 and is cooled by the cooling tower 4; backwashing drainage in the shallow sand filter 3 is discharged into a backwashing water regulating tank 7, after standing and precipitating, supernatant automatically flows into the hot water tank 1 through a supernatant outlet 72 for recycling, precipitated sludge is pressurized by a slurry pump 8 and is sent into the plate-and-frame filter press 9 for dehydration, and dehydrated dry sludge is additionally treated and can be transported to a designated place by a vehicle, and filtrate of the plate-and-frame filter press 9 automatically flows into the backwashing water regulating tank 7 through a filtrate pipeline 11; and a flocculating agent is added into the backwashing water regulating tank 7 through the chemical adding device 10 so as to assist flocculation and sedimentation of suspended matters in backwashing drainage.

Specifically, the hot water pool 1 is divided into two grids through a partition wall 14, a hole is formed in the partition wall 14, a square gate valve is arranged on the partition wall, the hydraulic retention time of each grid of hot water pool 1 is 10min, and the hot water upper tower pumps 2 can independently suck water from each grid of hot water pool 1; the filtering speed of the shallow sand filter 3 is less than or equal to 40m/h, the water inlet pressure is less than or equal to 0.4MPa, and the backwashing mode is water inlet backwashing; the filter material is natural sea sand with the grain diameter of 0.5-1.5 mm; the SS of the effluent is less than or equal to 20mg/L; the water spraying density of the cooling tower 4 is approximately equal to 14m3/m 2. H, the filler is in the form of grid filler, and the material is modified PP; the water distribution mode is pipe water distribution, the material of the main water distribution pipe is Q235, the material of the branch pipe is PVC-U, and the water temperature of the water discharged from the cooling tower 4 is less than or equal to 35 ℃; the water power of the cold water pool 5 is cut off for 15min; flocculating agents added into the backwashing water regulating tank 7 by the chemical adding device 10 comprise a first flocculating agent and a second flocculating agent, wherein the added first flocculating agent is polyaluminium chloride, and the adding amount is 50mg/L; the added second flocculating agent is PAM, and the adding amount is 1mg/L; the adding time interval of the first flocculating agent and the second flocculating agent is 5min; the reaction time of the flocculant is 20min, and the precipitation time is 90min.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a water treatment system for converter wet-type electrostatic precipitator equipment, includes circulating water processing system and muddy water processing system, its characterized in that: the circulating water treatment system comprises a hot water tank (1), a shallow sand filter (3) and a cooling tower (4) which are sequentially arranged along the flowing direction of the backwater discharged by the converter wet-type electric precipitation equipment;

the mud water treatment system is composed of a backwash water adjusting tank (7), a mud pump (8), a plate-and-frame filter press (9) and a dosing device (10), wherein the backwash water adjusting tank (7) is connected with the shallow sand filter (3) to receive backwash drainage in the shallow sand filter (3), the backwash water adjusting tank (7) is provided with a mud outlet (71) located at the bottom of the backwash water adjusting tank (7) and a supernatant outlet (72) located at the top of the backwash water adjusting tank (7), one end of the mud pump (8) is connected with the mud outlet (71), the other end of the mud pump is connected with the plate-and-frame filter press (9), the supernatant outlet (72) is connected with the hot water tank (1), and the dosing device (10) is connected with the backwash water adjusting tank (7) to add a flocculating agent into the backwash water adjusting tank (7).

2. The water treatment system for the wet electric dust removal equipment of the converter according to claim 1, wherein: and a filtrate pipeline (11) is arranged between the plate-and-frame filter press (9) and the backwashing water regulating tank (7).

3. The water treatment system for the wet electric dust removal equipment of the converter according to claim 1, wherein: and a hot water upper tower pump (2) for pressurizing and lifting the discharged return water in the hot water tank (1) is arranged between the hot water tank (1) and the shallow sand filter (3).

4. The water treatment system for the wet electric dust removal equipment of the converter according to claim 3, wherein: one side of the shallow sand filter (3) is provided with a bypass pipeline (12), one end of the bypass pipeline (12) is connected with the hot water upper tower pump (2), one end of the bypass pipeline is connected with the cooling tower (4), and the bypass pipeline (12) is provided with a switch valve (13).

5. The water treatment system for the wet-type electric dust removal equipment of the converter according to claim 3, characterized in that: the hot water tank (1) is divided into two grids through a partition wall (14) arranged in the hot water tank (1), and a square gate valve is arranged on the partition wall (14).

6. The water treatment system for the wet electric dust removal equipment of the converter according to claim 5, wherein: the hot water tower-feeding pump (2) is respectively connected with the two grids of the hot water pool (1).

7. The water treatment system for the wet electric dust removal equipment of the converter according to claim 1, wherein: the cooling tower (4) is a glass fiber reinforced plastic counter-flow cooling tower.

8. The water treatment system for the wet electric dust removal equipment of the converter according to claim 1, wherein: and a cold water pool (5) is arranged between the cooling tower (4) and the converter wet-type electric precipitation equipment.

9. The water treatment system for the wet electric dust removal equipment of the converter according to claim 8, wherein: a water supply pump (6) is arranged between the cold water tank (5) and the converter wet type electric precipitation equipment.

10. The water treatment system for the wet electric dust removal equipment of the converter according to claim 1, wherein: the effective volume of the backwashing water regulating tank (7) is not less than the primary feeding amount of the plate-and-frame filter press (9).