CN210457798U

CN210457798U - Wastewater treatment system

Info

Publication number: CN210457798U
Application number: CN201921267874.8U
Authority: CN
Inventors: 霍耿磊; 林东杰; 杨国政; 王守杰; 刘春雷; 刘颖
Original assignee: Changzheng Engineering Co Ltd
Current assignee: Changzheng Engineering Co Ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-05-05
Anticipated expiration: 2029-08-06

Abstract

The utility model discloses a wastewater treatment system, wherein the system includes: flash tank, filter and centrifuge; the flash tank is provided with a liquid outlet, a first liquid inlet for receiving black water to be treated and a second liquid inlet for receiving grey water to be treated, and the liquid outlet is communicated with the liquid inlet of the filter; the slurry outlet of the filter is communicated with the slurry inlet of the centrifuge; the centrifuge is also provided with a water outlet for discharging clean water and a slag discharge port for discharging waste slag. The utility model discloses an adopt flash tank, filter and centrifuge, carry out flash distillation processing, filtration processing and centrifugal treatment to waste water in proper order, realized the high temperature solid-liquid separation under certain pressure to the retrieval and utilization is carried out to the high temperature clear water, 60% calorific consumption and partial circulation power consumption can be saved. And the utility model discloses the effluent disposal system flow is shorter, and monomer equipment simple structure, maneuverability is strong, directly reduces system area and equipment investment.

Description

Wastewater treatment system

Technical Field

The utility model relates to a water treatment technical field especially relates to a wastewater treatment system.

Background

At present, in the production process of the coal chemical industry, a large amount of high-temperature wastewater can be generated, including black water discharged from a chilling chamber of a gasification furnace and grey water discharged from a washing tower of synthesis gas, and in order to save water resources, the wastewater is generally required to be treated and then recycled.

The existing wastewater treatment system mostly adopts a multi-stage flash evaporation process or a slag water indirect heat exchange cooling process. The existing flash process adopts three-stage flash of a high-pressure flash tank, a low-pressure flash tank and a vacuum flash tank, and realizes temperature reduction and pressure reduction, heat recovery and liquid-solid separation through the flash process. But because of adopting the multistage flash evaporation technology, the occupied area is large, the investment cost is higher, and the energy consumption is larger. However, the slag-water indirect heat exchange cooling process is adopted, and in the slag-water cooling process, ash carried by the slag-water, generated dirt and separated salt can scale a pipe box and a heat exchange pipe of the heat exchanger, so that the heat resistance of the heat exchange pipe is increased, the heat exchange efficiency is reduced, the heat exchanger is blocked seriously, the heat exchanger fails, and finally the system is stopped. Meanwhile, the scaling can also cause salt accumulation to cause corrosion of the heat exchange pipe.

In order to treat high-temperature wastewater, it is an urgent need to develop a wastewater treatment system and a wastewater treatment method with simple structure and high efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a wastewater treatment system for among the solution prior art, unable efficient carries out the problem handled to waste water.

In order to solve the technical problem, the embodiment of the application adopts the following technical scheme: a wastewater treatment system comprising: flash tank, filter and centrifuge; the flash tank is provided with a liquid outlet, a first liquid inlet for receiving black water to be treated and a second liquid inlet for receiving grey water to be treated, and the liquid outlet is communicated with the liquid inlet of the filter; the slurry outlet of the filter is communicated with the slurry inlet of the centrifuge; the centrifuge is also provided with a water outlet for discharging clean water and a slag discharge port for discharging waste slag.

Optionally, the flash tank is further provided with a steam exhaust port; the steam outlet is communicated with a gas recovery device through a gas exhaust pipe and is used for discharging the steam in the flash tank into the gas recovery device.

Optionally, the filter is further provided with a water outlet, and the water outlet is communicated with a water inlet of the delivery pump through a delivery pipe; the delivery pump is used for delivering the clean water filtered by the filter to the clean water recovery device.

Optionally, a water outlet of the centrifuge is communicated with a water inlet of the conveying pump through a conveying pipe; the conveying pump is also used for conveying the clean water subjected to centrifugal treatment by the centrifugal machine to a clean water recovery device.

Optionally, the flash tank is a high-pressure flash tank.

Optionally, the filter is a cross-flow concentration filter.

Optionally, the centrifuge is a high-pressure horizontal screw centrifuge.

Optionally, the first liquid inlet is provided with a first flow control valve; the second liquid inlet is provided with a second flow control valve.

Optionally, a third flow control valve is arranged at a liquid outlet of the flash tank.

The embodiment of the utility model provides a beneficial effect lies in: by adopting the flash tank, the filter and the centrifuge, the wastewater is subjected to flash evaporation treatment, filtration treatment and centrifugation treatment in sequence, high-temperature solid-liquid separation under certain pressure is realized, high-temperature clear water is recycled, and 60% of heat consumption and partial circulating power consumption can be saved. And the utility model discloses the effluent disposal system flow is shorter, and monomer equipment simple structure, maneuverability is strong, directly reduces system area and equipment investment.

Drawings

FIG. 1 is a schematic structural view of a wastewater treatment system according to an embodiment of the present invention.

Detailed Description

Various aspects and features of the present application are described herein with reference to the drawings.

It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with a general description of the application given above and the detailed description of the embodiments given below, serve to explain the principles of the application.

These and other characteristics of the present application will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.

It should also be understood that, although the present application has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of application, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.

The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application of unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.

The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.

The embodiment of the utility model provides a wastewater treatment system, include: a flash tank A, a filter B and a centrifuge C; the flash tank is provided with a liquid outlet 3, a first liquid inlet 1 for receiving black water to be treated and a second liquid inlet 2 for receiving grey water to be treated, and the liquid outlet 3 is communicated with a liquid inlet 5 of the filter B; the slurry outlet 6 of the filter is communicated with the slurry inlet 8 of the centrifuge; the centrifuge is also provided with a water outlet 10 for discharging clean water and a slag discharge port 9 for discharging waste slag.

Specifically, the flash tank in this embodiment is a high-pressure flash tank, and has the functions of performing reduced-pressure flash evaporation on black water and grey water entering the flash tank, reducing the pressure of mixed water, and improving the operability of subsequent working sections. The flash steam after flash evaporation is discharged from the equipment through a flash steam exhaust port 4 and enters a steam recovery device or a paving system, and the high-temperature mixed liquid enters a filter B through a mixed liquid outlet 3 for further separation treatment. In this embodiment, the first liquid inlet of the flash tank is provided with a first flow regulating valve 12, the second liquid inlet is provided with a second flow regulating valve 13, and the liquid outlet of the flash tank is further provided with a third flow regulating valve 14.

Specifically, the filter in this embodiment is a concentration filter, preferably a cross-flow concentration filter, and the filter tube thereof adopts a membrane surface filtration technology. The main function of the device is to concentrate the mixed liquid discharged from the flash tank, reduce the load of subsequent equipment, and simultaneously separate out high-temperature clear water reaching the standard and recycle the clear water to the system. The concentration filter B can separate the mixed liquid into clear water and thick slurry. Clear water is clear liquid after permeating the membrane, reaches the recycling index and can be directly recycled; the thick slurry is slurry with solid content of about 10%, and needs to enter a centrifuge C for further separation. The concentration filter B in the embodiment is divided into a shell pass and a tube pass, and the working principle is as follows: the mixed liquor enters the equipment pipe box from the inlet of the concentration filter B and is evenly distributed in each filter pipe, the clear water seeps out to the shell side from the interior of each filter pipe along with the forward flowing of the mixed liquor, the mixed liquor is gradually concentrated to form concentrated slurry of the concentration filter and is discharged from a slurry outlet 6 at the other side of the equipment pipe side, the concentrated slurry of the concentration filter enters the centrifuge C for further separation, and the seeped clear water of the concentration filter is discharged out of the equipment from a water outlet 7 at the shell side.

In this embodiment, the centrifuge is a high-pressure horizontal spiral centrifuge, and the main function of the centrifuge is to perform solid-liquid separation on the thick slurry discharged from the concentration filter under a certain pressure to form clear water and ash containing about 50% of solids after concentration for the high-pressure horizontal spiral centrifuge. The working principle of the high-pressure horizontal spiral centrifuge C is as follows: dense slurry with certain pressure enters the equipment from a slurry inlet 8 of a high-pressure horizontal spiral centrifuge C, rotates along with the high-speed rotation of the equipment, an annular liquid pool is formed in the equipment under the action of centrifugal force, heavy-phase solid particles are centrifugally precipitated on the inner surface of the equipment to form sediments, the sediments are pushed to a rear drying area by spiral blades in the equipment, the water is further squeezed to be dry and then is discharged out of the equipment through a rear slag outlet 9 to form ash residues, and clear water is discharged through a front water outlet 10 to form clear water of the high-pressure horizontal spiral centrifuge.

Specifically, the concentration filter is provided with a water outlet 7 in this embodiment. The wastewater treatment system is also provided with a delivery pump D, and the water outlet 7 of the concentration filter is communicated with the water inlet 11 of the delivery pump through a delivery pipe. The delivery pump is used for delivering the clean water filtered by the filter to the clean water recovery device.

Specifically, in this embodiment, the water outlet 10 of the centrifuge is communicated with the water inlet 11 of the delivery pump C through a delivery pipe; the conveying pump is also used for conveying the clean water subjected to centrifugal treatment by the centrifugal machine to a clean water recovery device.

The embodiment of the utility model provides a waste water treatment system's working process as follows: the flow rate of the black water from the chilling chamber of the gasification furnace is 154.8t/h, the flow rate of the black water with the solid content of 3.65t/h and the flow rate of the bottom of the synthetic gas washing tower are 18.27t/h, and the grey water with the solid content of 1.76t/h respectively enters the high-pressure flash tank A from the first liquid inlet 1 and the second liquid inlet 2. And (3) reducing pressure and flashing through a high-pressure flash tank A, discharging 3.07t/h of steam to a steam recovery device, and allowing the high-temperature mixed liquid with the solid content of 0.201t/h to enter a concentration filter B for solid-liquid separation. After separation, the concentrated slurry of the concentration filter with the flow rate of 52t/h and the solid content of 5.42t/h enters a high-pressure horizontal spiral centrifuge C from a slurry inlet 8 to be continuously separated; the clear water of the concentration filter with the flow rate of 118t/h enters the water inlet 11 from the water outlet 7 through the conveying pipe, and then enters the high-speed pump D for recycling. After being separated by a high-pressure horizontal spiral centrifuge C, the ash with the flow rate of 10.4t/h and the solid content of 5.2t/h is discharged out of the system through a slag discharge port 9; and fresh water of the high-pressure horizontal spiral centrifuge with the flow rate of 41.6t/h enters the high-speed pump D from the water inlet 11 for recycling. After the treatment of the system, 159.6t/h of clean water at 159 ℃ is recycled, thereby greatly reducing the heat consumption and simultaneously reducing the power consumption of about 5 kilograms.

The embodiment of the utility model provides a through adopting flash tank, filter and centrifuge, carry out flash distillation processing, filtration processing and centrifugal treatment to waste water in proper order, realized the high temperature solid-liquid separation under certain pressure to the retrieval and utilization is carried out to the high temperature clear water, 60% calorific consumption and partial circulation power consumption can be saved. The concentration filter is used in combination with a high-pressure horizontal spiral centrifuge. And the cross flow type concentration filter with a simple structure is used for carrying out high-temperature mixed water preliminary separation, high-temperature clear water reaching the standard after separation is directly recycled, and the rest 30 percent of thick slurry enters the high-pressure horizontal spiral centrifuge for subsequent separation, so that the load of the high-pressure horizontal spiral centrifuge is reduced, and the concentrated slurry also reaches the optimal inlet condition of the high-pressure horizontal spiral centrifuge. The embodiment of the utility model increases the sedimentation separation speed of solid particles, improves the solid content of ash slag, reduces the water content of ash slag and reaches the standard of ash slag transportation by adopting the high-pressure horizontal spiral centrifuge to separate thick slurry; meanwhile, the solid content in the clear liquid after centrifugal treatment is ensured to be lower, and the requirement of clear water recycling can be met. Therefore simultaneously, the utility model discloses waste water treatment system flow is shorter, and monomer equipment simple structure, maneuverability is strong, directly reduces system area and equipment investment.

The embodiment of the utility model provides a wastewater treatment method, including the following step:

step one, mixing black water to be treated with grey water to be treated to obtain a first mixed solution; carrying out pressure reduction flash evaporation treatment on the first mixed solution to obtain flash evaporation steam and a second mixed solution;

step two, carrying out concentration filtration treatment on the second mixed solution to obtain thick slurry and clear water;

and step three, recovering the clear water, and centrifuging the thick slurry to obtain ash and clear water.

And step four, recycling the ash and the recyclable clean water.

The embodiment of the utility model provides a through carry out flash distillation processing, filtration processing and centrifugal treatment to waste water in proper order, realized the high temperature solid-liquid separation under certain pressure to the retrieval and utilization is carried out to the high temperature clear water, 60% calorific consumption and partial circulation power consumption can be saved, improve the treatment effeciency.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.

Claims

1. A wastewater treatment system, comprising: flash tank, filter and centrifuge; the flash tank is provided with a liquid outlet, a first liquid inlet for receiving black water to be treated and a second liquid inlet for receiving grey water to be treated, and the liquid outlet is communicated with the liquid inlet of the filter; the slurry outlet of the filter is communicated with the slurry inlet of the centrifuge; the centrifuge is also provided with a water outlet for discharging clean water and a slag discharge port for discharging waste slag.

2. The wastewater treatment system of claim 1, wherein the flash tank is further provided with a steam exhaust; the steam outlet is communicated with a gas recovery device through a gas exhaust pipe and is used for discharging the steam in the flash tank into the gas recovery device.

3. The wastewater treatment system of claim 1, wherein the filter is further provided with a water outlet which communicates with a water inlet of the delivery pump through a delivery pipe; the delivery pump is used for delivering the clean water filtered by the filter to the clean water recovery device.

4. The wastewater treatment system of claim 3, wherein the water outlet of the centrifuge is in communication with the water inlet of the transfer pump through a transfer pipe; the conveying pump is also used for conveying the clean water subjected to centrifugal treatment by the centrifugal machine to a clean water recovery device.

5. The wastewater treatment system of claim 1, wherein the flash tank is a high pressure flash tank.

6. The wastewater treatment system of claim 1, wherein the filter is a cross-flow concentration filter.

7. The wastewater treatment system of claim 1, wherein the centrifuge is a high pressure horizontal screw centrifuge.

8. The wastewater treatment system of claim 1, wherein the first liquid inlet is provided with a first flow control valve; the second liquid inlet is provided with a second flow control valve.

9. The wastewater treatment system of claim 1, wherein the liquid outlet of the flash tank is provided with a third flow control valve.