Circulating water system for comprehensive treatment of waste water of thermal power plant

Abstract

The utility model discloses a circulating water system for comprehensive treatment of waste water of a thermal power plant. The circulating water system comprises a circulating water forebay, a filter tank and a deep treatment unit, the filter tank is used for storing discharged circulating water and is respectively communicated with a desulfurization system water replenishing pipe, the deep treatment unit and other water supply pipes through valves, a produced water outlet pipe of the deep treatment unit is communicated with the circulating water forebay, and a concentrated water outlet pipe is communicated with the desulfurization system water replenishing pipe. The filter tank comprises a tank body, a filter screen bracket group, a filter screen and a filter screen winding assembly. Discharged circulating water enters the desulfurization system after being filtered, waste of the circulating water can be reduced, meanwhile, the deep treatment unit is further arranged, when the load of a unit is reduced and water replenished by the desulfurization system is correspondingly reduced, concentrated water treated by the deep treatment system enters the desulfurization system, and produced water is recycled to the cooling tower, so that the water quantity difference value is adjusted. Aiming at the cleaning of the filter screen of the filter tank, the utility model provides the filter screen capable of being rolled, so that the rolling is convenient during cleaning, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a circulating water system for comprehensive treatment of waste water in a thermal power plant. Background Art

[0002] In order to ensure the normal operation of the generators in the power plant, it is necessary to set up circulating water and ventilation cooling towers. Generally speaking, the cooling tower water supply is taken from the circulating water forebay, and the unit cooling water flows from the cooling tower pool to the circulating water pump room forebay. After being pressurized by the circulating water pump, it is sent to the condenser and other equipment coolers through the pressure inlet pipe for heat exchange. The warm drainage water after heat exchange returns to the central shaft of the cooling tower through the circulating water return pipe, and returns to the cooling tower pool after spraying and natural ventilation cooling for the next cycle. In the process of repeated use of circulating water, impurities such as salt, hardness, and suspended matter continue to accumulate, affecting the heat exchange effect and service life of the equipment. Therefore, the circulating water system needs to continuously discharge a certain amount of circulating water and add an equal amount of fresh water to ensure the stable operation of the system. This will generate a large amount of circulating water, which will cause great waste if it is directly discharged without treatment.

[0003] In addition, a filter pool is required for temporary storage and filtration of water during the recycling water treatment process. The filter pool is generally open-air, and the filter needs to be cleaned during use. Underwater cleaning has certain limitations, and the reliability of related equipment is not high. The filter is generally lifted and cleaned by hoisting. The operation requires the use of a crane and there is a certain risk. Patent CN112337154B, a foldable circulating water forepool flat filter and its folding method, discloses a foldable filter. However, the filter in the patent is also larger after folding, which is not conducive to hoisting, and the hoisting process involves the outward movement of the filter, which requires manual participation and there is a certain risk. Utility Model Content

[0004] The utility model aims to provide a circulating water system for comprehensive wastewater treatment in a thermal power plant to solve the problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a circulating water system for comprehensive treatment of wastewater from a thermal power plant, including a circulating water forebay, a filter tank, and a deep treatment unit, wherein the deep treatment unit includes an ultrafiltration subunit, a reverse osmosis subunit, and a sludge treatment subunit; the filter tank is used to store circulating water drainage, which is connected to the desulfurization system feed water pipe, the deep treatment unit, and other water supply pipes through valves, the water outlet pipe of the deep treatment unit is connected to the circulating water forebay, and the concentrate outlet pipe is connected to the desulfurization system feed water pipe.

[0006] Furthermore, the filter tank includes a tank body, a filter screen support group, a filter screen, and a filter screen winding assembly; the filter screen winding assembly includes a winding roller unit, a cleaning unit, and a mooring unit; the filter screen support group includes a plurality of filter screen supports arranged on the bottom and side walls of the tank body, and the filter screen supports are provided with grooves for accommodating the filter screen; the upper and lower sides of the filter screen are respectively connected to the dragging steel cables, and the dragging steel cables are respectively connected to the winding roller unit and the mooring unit of the filter screen winding assembly.

[0007] Furthermore, vertically arranged filter screen supports are provided on both sides and in the middle of the horizontally arranged filter screen support at the bottom of the pool body. Several horizontal support rods are also provided in the upper and middle parts of the pool body, which are arranged on both sides of the corresponding space of the groove; the vertically arranged filter screen supports are arranged opposite to each other in pairs.

[0008] Furthermore, a relatively inclined guide plate is provided at the top of the groove of the vertically arranged filter bracket.

[0009] Furthermore, the filter screen includes an upper plate, a lower plate, a filter screen, a plurality of connecting steel cables, and a plurality of side fixing plates; the two ends of the filter screen are respectively fixed to the upper plate and the lower plate, the connecting steel cable is arranged between the upper plate and the lower plate, and is located on the side of the filter screen close to the water outlet; a plurality of side fixing plates are arranged at intervals on the connecting steel cables at the ends of both sides of the upper plate and the lower plate; the upper part of the upper plate and the lower part of the lower plate are respectively connected to the dragging steel cables; the upper plate, the lower plate, and the side fixing plates can be embedded in the groove of the filter screen bracket.

[0010] Furthermore, the winding roller unit is arranged at the top of the vertically arranged filter screen bracket, located at the oblique upper part of the filter screen, including a winding roller and a driving motor, and the cross-section of the winding roller is polygonal; the cleaning unit includes a bending water guide plate and a guide roller, and the guide roller and the bending water guide plate are arranged on the vertically arranged filter screen bracket, wherein the guide roller is rotatably arranged on the vertically arranged filter screen bracket, the bending water guide plate is arranged on one side of the guide roller, and its end portion inclined downward away from the guide roller is provided with an upward bending section, and the end portion of the bending water guide plate is provided with a sewage downpipe for cleaning; the mooring unit includes a bottom guide wheel and an upper rotating wheel; the bottom guide wheel is arranged at the bottom of the pool body near the bottom of the vertically arranged filter screen bracket and near the water outlet side of the pool body, and the upper rotating wheel is arranged on the vertically arranged filter screen bracket at the top of the pool body, and the upper rotating wheel includes a rope collecting roller and a rotating wheel part; the steel cables are dragged on both sides of the lower part of the lower plate of the filter screen through the through holes at the bottom of the vertically arranged filter screen bracket near the water outlet side, and are connected to the upper rotating wheel through the bottom guide wheel.

[0011] The circulating water system of the utility model filters the discharged circulating water and then enters the desulfurization system, which can reduce the waste of circulating water. At the same time, a deep processing unit is also provided. When the load of the unit is reduced and the water replenishment of the desulfurization system is reduced accordingly, the concentrated water treated by the deep processing system goes to the desulfurization system, and the produced water is recycled to the cooling tower to adjust the water volume difference.

[0012] With respect to the cleaning of the filter screen of the filter pool, the present application provides a rollable filter screen, which is convenient for rolling up during cleaning, has low labor intensity, low risk and high operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall solution of the utility model.

[0014] Figure 2 It is a schematic diagram of the overall scheme of the filter pool of the utility model.

[0015] Figure 3 It is a schematic cross-sectional view of the area of ​​the filter screen reel assembly of the filter pool of the utility model.

[0016] Figure 4 It is an enlarged schematic diagram of the mooring unit area of ​​the utility model.

[0017] Figure 5 This is a schematic diagram of the utility model filter DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] As attached Figure 1 As shown, the utility model relates to a circulating water system for comprehensive wastewater treatment in a thermal power plant, which includes a circulating water forepool 1, a filter tank 2, and a deep treatment unit 3. The deep treatment unit 3 includes an ultrafiltration subunit, a reverse osmosis subunit, and a sludge treatment subunit. The ultrafiltration subunit, the reverse osmosis subunit, and the sludge treatment subunit are commercially available products.

[0020] The circulating water forepool 1 is used for circulating water supply, and the filter tank is used for storing circulating water drainage, which are respectively connected to the desulfurization system water supply pipe b1, the deep treatment unit 3, and other water supply pipes b2 through valves. The water outlet pipe of the deep treatment unit 3 is connected to the circulating water forepool 1, and the concentrated water outlet pipe is connected to the desulfurization system water supply pipe. The other water supply pipe b2 can be a coal yard spray water supply pipe.

[0021] As attached Figure 2-5 As shown, the filter pool 2 includes a pool body 21, a filter screen support group 22, a filter screen 23, and a filter screen winding assembly 24.

[0022] The tank body 21 can be a concrete tank body or a steel structure tank body, and a working corridor plate 211 is arranged on the upper part, and a fence is arranged on the working corridor plate (not shown in the drawings).

[0023] The filter support group 22 includes a plurality of filter supports 221 arranged on the bottom and side walls of the pool body, and the filter supports 221 are provided with grooves c for accommodating the filter. The accompanying drawings include filter supports arranged horizontally at the bottom, filter supports 221 arranged vertically on the side walls of the pool body on both sides of the bottom filter support 221, and filter supports 221 arranged vertically in the middle of the bottom filter support. In addition, a plurality of horizontal support rods 222 are arranged at the upper and middle parts, arranged on both sides of the corresponding space of the groove, for limiting the position of the filter.

[0024] The vertically arranged filter screen supports are arranged opposite to each other in pairs, so as to reduce the width of the filter screens and the weight of a single filter screen for easy winding and cleaning.

[0025] The top of the groove of the vertically arranged filter screen support 221 is provided with an inclined guide plate 223 which is arranged opposite to each other and is used to guide the filter screen 23 to enter the groove c.

[0026] As attached Figure 5 As shown, the filter screen 23 includes an upper plate 231, a lower plate 232, a filter screen 233, a plurality of connecting steel cables 234, and a plurality of side fixing plates 235. Figure 5 No filter 233 is provided in the middle left filter 23 .

[0027] The two ends of the filter screen 233 are respectively fixed to the upper plate 231 and the lower plate 232 , and the connecting steel cable 234 is arranged between the upper plate 231 and the lower plate 232 and is located on the side of the filter screen 233 close to the water outlet.

[0028] A plurality of side fixing plates 235 are arranged at intervals on the connecting steel cables 234 located at both side ends of the upper plate 231 and the lower plate 232 .

[0029] The upper part of the upper plate 231 and the lower part of the lower plate 232 are respectively connected to the dragging cable 1.

[0030] The upper plate 231 , the lower plate 232 , and the side fixing plate 235 can be embedded in the groove c of the filter support.

[0031] As attached Figure 2 , 3As shown in Figure 4, the filter screen winding assembly 24 includes a winding roller unit 241, a cleaning unit 242, and a mooring cable unit 243.

[0032] The winding roller unit 241 is arranged at the top of the vertically arranged filter bracket, located at the upper oblique part of the filter 23, and includes a winding roller 2411 and a driving motor 2412. The winding roller 2411 has a polygonal cross-section and is hexagonal in the attached figure. It includes side panels, connecting rods, and a central rotating shaft. The central rotating shaft rotates under the drive of the driving motor 2412. The winding roller 2411 is connected to the dragging steel cable 1 on both sides of the upper part of the upper plate 231. The filter 23 can be driven to be gradually wound onto the winding roller 2411 through rotation.

[0033] The cleaning unit 242 includes a bent water guide plate 2421 and a guide roller 2422. The guide roller 2422 and the bent water guide plate 2421 are arranged on a vertically arranged filter screen bracket, wherein the guide roller 2422 is rotatably arranged on the vertically arranged filter screen bracket, and the bent water guide plate 2421 is arranged on one side of the guide roller 2422, and is tilted downward away from the guide roller 2422. An upward bending section is arranged at the end thereof. The filter screen is pulled upward by the winding roller unit 241, tilted after passing through the guide roller 2422, and can be cleaned by flushing with water, and the sewage flows out through the bent water guide plate 2421. A sewage cleaning downpipe 2423 is arranged at the end of the bent water guide plate 2421.

[0034] The mooring unit 243 includes a bottom guide wheel 2432 and an upper rotating wheel 2431. The bottom guide wheel 2432 is arranged at the bottom of the pool body 21 near the bottom of the vertically arranged filter screen bracket and near the water outlet side of the pool body 21, and the upper rotating wheel 2431 is arranged on the vertically arranged filter screen bracket at the top of the pool body 21. The upper rotating wheel 2431 includes a rope collection roller z1 and a rotating wheel part z2. The rotating wheel part can be rotated manually or driven by a motor. The rope collection roller z1 also has a limiting structure, which can be limited by a commonly used limiting pin.

[0035] The limiting structure and the driving structure of the rotating wheel part z2 are conventional knowledge in the field.

[0036] The dragging steel cables 1 on both sides of the lower part of the lower plate 232 of the filter screen 23 pass through the through hole at the bottom of the vertically arranged filter screen bracket close to the water outlet, and are connected to the upper rotating wheel 2431 through the bottom guide wheel 2432. The filter screen 23 is driven to move downward by the rotation of the upper rotating wheel 2431 and the winding roller unit 241. The dragging steel cables 1, the limiting relationship between the upper plate 231, the lower plate 232, the side fixing plate 235 of the filter screen 23 and the groove c of the filter screen bracket, and the support of the filter screen by the connecting steel cable 234 realize good fixation of the filter screen.

[0037] It should be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A circulating water system for comprehensive wastewater treatment in a thermal power plant, characterized in that: It includes a circulating water forepool, a filter tank, and a deep treatment unit. The deep treatment unit includes an ultrafiltration subunit, a reverse osmosis subunit, and a sludge treatment subunit. The filter tank is used to store circulating water drainage, and is connected to the desulfurization system feed water pipe, the deep treatment unit, and other water supply pipes through valves. The water outlet pipe of the deep treatment unit is connected to the circulating water forepool, and the concentrate outlet pipe is connected to the desulfurization system feed water pipe.

2. The circulating water system for comprehensive treatment of wastewater from a thermal power plant according to claim 1, characterized in that: The filter tank includes a tank body, a filter screen support group, a filter screen, and a filter screen winding assembly; the filter screen winding assembly includes a winding roller unit, a cleaning unit, and a mooring unit; the filter screen support group includes a plurality of filter screen supports arranged on the bottom and side walls of the tank body, and the filter screen supports are provided with grooves for accommodating the filter screen; the upper and lower sides of the filter screen are respectively connected to dragging steel cables, and the dragging steel cables are respectively connected to the winding roller unit and the mooring unit of the filter screen winding assembly.

3. The circulating water system for comprehensive treatment of wastewater from a thermal power plant according to claim 2, characterized in that: The filter screen bracket arranged horizontally at the bottom of the pool body is provided with vertical filter screen brackets on both sides and in the middle. Several horizontal support rods are also provided at the upper and middle parts of the pool body, which are arranged on both sides of the corresponding space of the groove; the vertical filter screen brackets are arranged opposite to each other in pairs.

4. The circulating water system for comprehensive treatment of wastewater from a thermal power plant according to claim 3, characterized in that: The top of the vertically arranged filter screen bracket groove is provided with a relatively inclined guide plate.

5. The circulating water system for comprehensive treatment of wastewater from a thermal power plant according to claim 4, characterized in that: The filter screen includes an upper plate, a lower plate, a filter screen, a plurality of connecting steel cables, and a plurality of side fixing plates; the two ends of the filter screen are respectively fixed to the upper plate and the lower plate, the connecting steel cable is arranged between the upper plate and the lower plate, and is located on the side of the filter screen close to the water outlet; a plurality of side fixing plates are arranged at intervals on the connecting steel cables at the ends of both sides of the upper plate and the lower plate; the upper part of the upper plate and the lower part of the lower plate are respectively connected to the dragging steel cables; the upper plate, the lower plate, and the side fixing plates can be embedded in the groove of the filter screen bracket.

6. The circulating water system for comprehensive wastewater treatment in thermal power plants according to claim 5, characterized in that: The winding roller unit is arranged at the top of the vertically arranged filter screen bracket and is located at the oblique upper part of the filter screen. It includes a winding roller and a driving motor, and the cross-section of the winding roller is polygonal; the cleaning unit includes a bent water guide plate and a guide roller, and the guide roller and the bent water guide plate are arranged on the vertically arranged filter screen bracket, wherein the guide roller is rotatably arranged on the vertically arranged filter screen bracket, and the bent water guide plate is arranged on one side of the guide roller, and its end portion which is inclined downward away from the guide roller is provided with an upward bending section, and the end portion of the bent water guide plate is provided with a sewage downpipe for cleaning; the mooring unit includes a bottom guide wheel and an upper rotating wheel; the bottom guide wheel is arranged at the bottom of the pool body near the bottom of the vertically arranged filter screen bracket and near the water outlet side of the pool body, and the upper rotating wheel is arranged on the vertically arranged filter screen bracket at the top of the pool body, and the upper rotating wheel includes a rope collecting roller and a rotating wheel part; the steel cables are dragged on both sides of the lower part of the lower plate of the filter screen through the through holes at the bottom of the vertically arranged filter screen bracket near the water outlet side, and are connected to the upper rotating wheel through the bottom guide wheel.

Images