CN204282117U - A papermaking white water recovery system - Google Patents

Abstract

The utility model relates to a papermaking plain boiled water recovery system, including plain boiled water pond, bed course thick liquid pond, vacuum pump, many disc filters, recovery thick liquid pond, overhead tank, muddy water pond, clean water basin, super clean water basin and controller, many disc filters include multiunit filter disc and spray set, and the delivery port in muddy water pond and super clean water basin is connected with spray set through the vacuum pump respectively, and super clean filtrate in super clean water basin passes through the vacuum pump and retrieves to the papermaking workshop. The application discloses papermaking plain boiled water recovery system not only can follow the recovery fibre in the plain boiled water, and the fibre rate of recovery is high, can also make plain boiled water obtain closed cycle and use to reduce papermaking water consumption, eliminate the pollution that plain boiled water discharged, the water economy resource.

Description

A papermaking white water recovery system

technical field

The present application relates to the technical field of papermaking white water recovery, in particular to a papermaking white water recovery system.

Background technique

In recent years, the state has become stricter in environmental protection requirements, and the sewage discharge standards have become higher and higher.

It is a large water user, and because the waste water discharged from the paper mill is difficult to recycle and treat, it has a serious impact on the environment. In order to meet the waste water discharge standards, the company must continuously improve the production process, transform the backward waste water treatment technology, and reduce the water consumption before the production water can be treated. Recycle later. In the papermaking process, the papermaking pulping process consumes a lot of water, and the discharge of white water is large, resulting in waste of resources. Relying on white water reuse can greatly reduce water consumption.

In the prior art, the recovery capacity of papermaking white water is often insufficient, and the depulping effect is poor, resulting in relatively poor filtrate quality, resulting in a large amount of clean water for the paper machine, but the recovery rate of white water is not high.

Contents of the invention

The purpose of this application is to avoid the deficiencies in the prior art and provide a papermaking white water recovery system with high white water recovery rate, energy saving and environmental protection.

The purpose of this application is achieved through the following technical solutions:

A papermaking white water recovery system is provided, comprising a white water tank, a pad slurry tank, a vacuum pump, a filter and a recycled pulp tank, characterized in that it also includes a turbid water tank, a clear water tank, an ultra-clear water tank and a controller, the white water tank and The slurry tank of the cushion layer is respectively communicated with the pulp inlet of the filter through the vacuum pump, and the pulp outlet of the filter is communicated with the recovered pulp tank;

The filter is a multi-disc filter, and the multi-disc filter includes a main shaft, a plurality of sets of filter discs fixed on the main shaft, and spray devices arranged on both sides of the filter discs, and the plurality of sets of filter discs The filtrate outlet of the disc is provided with a distribution valve, and the distribution valve is provided with three filtrate outlets, and the three filtrate outlets are respectively a turbid filtrate outlet, a clear filtrate outlet and an ultra-clear filtrate outlet, and the turbid filtrate outlet is connected to the turbid water pool. connected, the outlet of the clear filtrate is communicated with the clear water pool, the outlet of the ultra-clean filtrate is communicated with the ultra-clear water pool, and the water outlets of the turbid water pool and the ultra-clear water pool are respectively connected to the spraying device through a vacuum pump Connected, the ultra-clean filtrate in the ultra-clear water pool is recycled to the paper workshop through a vacuum pump.

Wherein, each group of filter discs includes several filter discs, and each filter disc includes several fan-shaped plates, and each fan-shaped plate is fixedly connected to the main shaft through bolts.

Wherein, the fan-shaped plate includes a fan-shaped sieve and a frame arranged around the fan-shaped sieve, the fan-shaped sieve is provided with sieve holes, the surface of the fan-shaped sieve is corrugated, and the root of the fan-shaped sieve A collecting funnel is provided, the bottom of the collecting funnel is provided with a bottom plate, the bottom plate is fixedly connected with the main shaft, and the liquid outlet at the bottom of the collecting funnel communicates with the corresponding filtrate outlet.

Wherein, the spraying device includes a pulp stripping water spray device and a net washing water spray device, the pulp stripping water spray device includes a pulp stripping water spray pipe, and the net washing water spray device includes a net washing water spray pipe, the The water spray end of the net washing spray pipe is provided with double nozzles, and both the stripping water spray pipe and the net washing spray pipe are connected with the turbid water pool.

Wherein, the turbid water pool, the clear water pool and the ultra-clear water pool are all pools surrounded by four walls, and the clear water pool and the ultra-clear water pool are connected by a shared first partition wall, so The clear water pool is connected to the muddy water pool through a shared second partition wall.

Wherein, the height of the first partition wall among the four walls of the ultra-clear water pool is lower than that of the remaining three walls, and the height of the second partition wall among the four walls of the clear water pool is lower than that of the remaining three walls the height of.

Wherein, the pipeline between the white water tank and the vacuum pump and the pipeline between the cushion slurry tank and the vacuum pump are all provided with flow control valves, and the flow control valves are electrically connected to the controller .

Wherein, both the ultra-clear water tank and the recovered slurry tank are provided with liquid level sensors, and the liquid level sensors are electrically connected to the controller.

The beneficial effect of this application:

In the papermaking white water recovery system of the present application, when the white water and cushion pulp produced in the papermaking process of the paper machine are transported to the high-level box for mixing, they are sent to the multi-disc filter for recycling. With the continuous rotation of the filter disc, continuous The distribution valve of the multi-disc filter sends the recovered filtrate to the turbid water pool, the clear water pool and the ultra-clear water pool respectively, and the turbid white water recovered in the turbid water pool is sent to the spray device of the multi-disc filter for Clean the wire surface and peel off the pulp layer on the filter disc; the ultra-clean filtrate recovered in the ultra-clear water tank can be used for high-pressure spraying of the wire part of the paper machine, thereby reducing the amount of clean water, and the slurry in the recovered pulp tank is processed to recover fibers and fillers. The papermaking white water recovery system of the present application can not only recover fibers from white water with a high fiber recovery rate, but also enable water to be used in a closed cycle, thereby reducing water consumption in papermaking, eliminating pollution from white water discharge, saving water resources, and has a high degree of automation , The advantages of simple and reliable operation.

Description of drawings

The application will be further described by using the accompanying drawings, but the content in the accompanying drawings does not constitute any limitation to the application.

Fig. 1 is a schematic structural diagram of a papermaking white water recovery system of the present application.

Fig. 2 is a structural schematic diagram of a multi-disc filter of a papermaking white water recovery system of the present application.

Fig. 3 is a structural schematic diagram of a fan-shaped plate of a papermaking white water recovery system of the present application.

Reference signs:

white pool 1;

Cushion slurry pool 2;

Multi-disc filter 3, filter disc 31;

Sector plate 32, sector sieve 321, sieve hole 3211;

Frame 322, collecting funnel 323, collecting funnel 323, bottom plate 324,

Distribution valve 33, turbid filtrate outlet 331, clear filtrate outlet 332, ultra-clear filtrate outlet 333;

Recovery slurry tank 4;

Turbid pool 5;

Clean water pool 6;

Ultra-clear pool 7;

Stripping water spray pipe 8;

Net washing spray pipe 9.

Detailed ways

The present application will be further described in conjunction with the following embodiments and accompanying drawings.

A kind of papermaking white water recovery system of the present application, as shown in Fig. 1 to Fig. 3, comprises white water pool 1, pad slurry pool 2, vacuum pump, filter and recovery pulp pool 4, also includes turbid water pool 5, clean water pool 6, The ultra-clear water tank 7 and the controller, the white water tank 1 and the cushion slurry tank 2 are respectively communicated with the pulp inlet of the filter through a vacuum pump, and the pulp outlet of the filter is communicated with the recovered pulp tank 4.

The filter is a multi-disc filter 3, and the multi-disc filter 3 includes a main shaft, a plurality of filter discs 31 fixed on the main shaft and spray devices arranged on both sides of the filter disc 31, and the filtrate outlets of the multi-group filter discs 31 are set There is distribution valve 33, and distribution valve 33 is provided with three filtrate outlets, and three filtrate outlets are turbid filtrate outlet 331, clear filtrate outlet 332 and ultraclean filtrate outlet 333 respectively, and turbid filtrate outlet 331 communicates with turbid pool 5, and clear filtrate outlet 332 It is communicated with the clear water pool 6, and the ultra-clear filtrate outlet 333 is communicated with the ultra-clear water pool 7, and the water outlets of the turbid water pool 5 and the ultra-clear water pool 7 are respectively connected with the spraying device through a vacuum pump, and the ultra-clear filtrate of the ultra-clear water pool 1 is recycled to Paper workshop.

The distribution valve 33 adopts a flat contact type, and the various parts of the filter disc 31 are in different working states through the partitions on the distribution valve 33:

The main shaft drives the filter disc 31 to rotate. When a fan-shaped plate 32 is immersed in the liquid surface, the water passing through the fan-shaped plate 32 forms a vacuum filtrate. Cushion, in this area, a small part of fibers and fillers pass through the filter screen together with the filtrate to form a turbid filtrate, called the turbid filtrate area, which is discharged to the turbid water pool 5 through the drain pipe, and the turbid white water in the turbid water pool 5 It can be used to flush the receiving hopper and dilute the output slurry;

The main shaft continues to rotate. At this time, the fiber cushion layer on the filter disc 31 has reached a certain thickness and acts as a filter medium. Under the action of vacuum suction, the fibers and fillers in the filtrate are adsorbed on the cushion layer. The inside of the valve 33 is in a vacuum area, and the solids passing through the filter screen are greatly reduced to form a clear filtrate, called the filtrate, which is discharged into the filtrate pool, and this part of the filtrate can be used for net washing and depulping;

The main shaft continues to rotate, the slurry layer on the filter disc 31 continues to thicken, the filtering effect is better, the slurry layer on the filter screen continues to dehydrate, and the filter cake degree increases. At this time, the filtrate clarity further increases. This part of the filtrate is called ultra-clean filtrate , can be used in paper machine wire section;

The main shaft continues to rotate, the vacuum effect gradually disappears, and enters the peeling area (that is, the atmospheric area). At this time, the fan-shaped water flow sprayed by the spray devices on both sides of the filter disc 31 begins to peel off the pulp layer. In the receiving hopper, the water flow from the flushing pipe rushes to the discharge port and dilutes;

The filter disc 31 rotates to the screen washing area, which is connected to the atmosphere, and the water flow ejected from the nozzle of the swinging spray device regenerates the filter screen, and the filter screen after the recovery of the filtering capacity enters the next filter cycle. The continuous rotation of the filter disc 31 makes the fan-shaped plate 32 work in different intervals to produce continuous filtration, recover fibers and fillers from the white water, and reuse the ultra-clear filtrate, or concentrate the slurry to meet the requirements.

Specifically, each set of filter discs 31 includes several filter discs, and each filter disc includes several sector plates 32, and each sector plate 32 is fixedly connected to the main shaft through bolts.

Specifically, the fan-shaped plate 32 includes a fan-shaped screen 321 and a frame 322 arranged around the fan-shaped screen 321, the fan-shaped screen 321 is provided with a screen hole 3211, the surface of the fan-shaped screen 321 is corrugated, and the root of the fan-shaped screen 321 is set. There is a collecting funnel 323, the bottom of the collecting funnel 323 is provided with a bottom plate 324, the bottom plate 324 is fixedly connected with the main shaft, and the liquid outlet at the bottom of the collecting funnel 323 communicates with the corresponding filtrate outlet.

In the present embodiment, the spraying device includes a water spray device for stripping and a water spray device for washing nets, the water spray device for stripping comprises a water spray pipe for stripping 8, the water spray device for washing nets includes a water spray pipe for washing nets 9, and the water spray for washing nets The water spray end of water pipe 9 is provided with double nozzle, and peeling water spray pipe 8 and washing net water spray pipe 9 are all communicated with turbid water pool 5.

In the present embodiment, the turbid water pool 5, the clear water pool 6 and the ultra-clear water pool 7 are all pools surrounded by four walls, and the clear water pool 6 and the ultra-clear water pool 7 are connected by a shared first partition wall. 6 and the turbid water pool 5 are connected through a shared second partition wall.

The height of the first partition wall in the four walls of the ultra-clear water pool 7 is lower than the height of the remaining three walls, and the height of the second partition wall in the four walls of the clear water pool 6 is lower than the height of the remaining three walls, so that the ultra-clear water pool The white water in 7 overflows to clear water pool 6 and muddy water pool 5.

In this embodiment, the pipeline between the white water tank 1 and the vacuum pump and the pipeline between the pad slurry tank 2 and the vacuum pump are all provided with flow control valves, and the flow control valves are electrically connected to the controller to control the flow.

Both the ultra-clear water pool 7 and the recovered pulp pool 4 are provided with liquid level sensors, and the liquid level sensors are electrically connected to the controller, thereby controlling the liquid levels in each pool and realizing automatic control.

It works as follows:

When the white water and cushion pulp produced in the papermaking process of the paper machine are transported to the high-level box for mixing, they are sent to the multi-disc filter 3 for recycling treatment. With the continuous rotation of the filter disc 31, continuous filtration is generated. The distributing valve 33 of the disc filter 3 sends the recovered filtrate to the turbid water pool 5, the clear water pool 6 and the ultra-clear water pool 7 respectively, wherein: the turbid white water recovered in the turbid water pool 5 is sent to the spray device of the multi-disc filter 3 It is used to clean the wire surface and peel off the slurry layer on the filter disc; the ultra-clean filtrate recovered in the ultra-clear water tank 7 can be used for high-pressure spraying of the wire part of the paper machine, thereby reducing the amount of clean water, and the slurry in the recovered slurry tank 4 is treated Recycled fibers and fillers.

The papermaking white water recovery system of the present application can not only recover fibers from white water with a high fiber recovery rate, but also enable water to be used in a closed cycle, thereby reducing water consumption in papermaking, eliminating pollution from white water discharge, saving water resources, and has a high degree of automation , The advantages of simple and reliable operation.

Claims (8)

1. A papermaking white water recovery system, comprising a white water tank, a cushion layer pulp tank, a vacuum pump, a filter and a reclaimed pulp tank, is characterized in that: it also includes a turbid water tank, a clear water tank, an ultra-clear water tank and a controller, and the white water tank The slurry tank of the cushion layer is respectively communicated with the pulp inlet of the filter through the vacuum pump, and the pulp outlet of the filter is communicated with the recovered pulp tank; The filter is a multi-disc filter, and the multi-disc filter includes a main shaft, a plurality of sets of filter discs fixed on the main shaft, and spray devices arranged on both sides of the filter discs, and the plurality of sets of filter discs The filtrate outlet of the disc is provided with a distribution valve, and the distribution valve is provided with three filtrate outlets, and the three filtrate outlets are respectively a turbid filtrate outlet, a clear filtrate outlet and an ultra-clear filtrate outlet, and the turbid filtrate outlet is connected to the turbid water pool. connected, the outlet of the clear filtrate is communicated with the clear water pool, the outlet of the ultra-clean filtrate is communicated with the ultra-clear water pool, and the water outlets of the turbid water pool and the ultra-clear water pool are respectively connected to the spraying device through a vacuum pump Connected, the ultra-clean filtrate in the ultra-clear water pool is recycled to the paper workshop through a vacuum pump. 2. A kind of papermaking white water recovery system according to claim 1, characterized in that: each group of filter discs includes several filter discs, each filter disc includes several fan-shaped plates, and each fan-shaped plate is connected to each other by bolts The main shaft is fixedly connected. 3. A papermaking white water recovery system according to claim 2, characterized in that: the fan-shaped plate includes a fan-shaped screen and a frame arranged around the fan-shaped screen, and the fan-shaped screen is provided with a sieve hole, The surface of the fan-shaped sieve is corrugated, the root of the fan-shaped sieve is provided with a collecting funnel, the bottom of the collecting funnel is provided with a bottom plate, the bottom plate is fixedly connected with the main shaft, and the collecting funnel The liquid outlet at the bottom communicates with the corresponding filtrate outlet. 4. A papermaking white water recovery system according to claim 1, characterized in that: said spraying device comprises a stripping water spraying device and a net washing water spraying device, and said stripping water spraying device comprises a stripping water spraying device The net washing water spraying device includes a net washing water spray pipe, the water spray end of the net washing water spray pipe is provided with double nozzles, the stripping water spray pipe and the net washing water spray pipe are all connected with the net washing water spray pipe The turbid pool is connected. 5. A papermaking white water recovery system according to claim 1, characterized in that: said turbid water pool, said clear water pool and said ultra-clear water pool are all pools surrounded by four walls, and said clear water pool It is connected with the ultra-clear water pool through a shared first partition wall, and the clean water pool is connected with the turbid water pool through a shared second partition wall. 6. A kind of papermaking white water recovery system according to claim 5, characterized in that: the height of the first partition wall in the four walls of the ultra-clear water pool is lower than the height of the remaining three walls, and the clean water pool The height of the second partition wall among the four walls is lower than that of the remaining three walls. 7. A papermaking white water recovery system according to claim 1, characterized in that: the pipeline between the white water tank and the vacuum pump and the pipeline between the cushion slurry tank and the vacuum pump are both A flow control valve is provided, and the flow control valve is electrically connected with the controller. 8. A papermaking white water recovery system according to claim 1, characterized in that: said ultra-clear water tank and said recovered pulp tank are both provided with liquid level sensors, and said liquid level sensors are electrically connected to said controller .