CN211419857U

CN211419857U - Desulfurization wastewater treatment system

Info

Publication number: CN211419857U
Application number: CN201921929799.7U
Authority: CN
Inventors: 袁广水
Original assignee: Huaneng Yingcheng Thermal Power Co ltd
Current assignee: Huaneng Yingcheng Thermal Power Co ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-09-04
Anticipated expiration: 2029-11-08

Abstract

The utility model provides a desulfurization wastewater treatment system, which comprises a vacuum steam-water separator, a wastewater buffer tank, a neutralization water tank, an electronic flocculator, a centrifugal clarifier, an intermediate water tank, a multi-medium filter and a reuse water tank; the discharge end of the vacuum steam-water separator of the gypsum dehydrator is communicated with the feeding end of the wastewater buffer tank, the discharge end of the wastewater buffer tank is communicated with the feeding end of the neutralization water tank, the discharge end of the neutralization water tank is communicated with the feeding end of the electronic flocculator, the discharge end of the electronic flocculator is communicated with the feeding end of the centrifugal clarifier, the discharge end of the centrifugal clarifier is communicated with the feeding end of the middle water tank, the discharge end of the middle water tank is communicated with the feeding end of the multi-medium filter, and the discharge end of the multi-medium filter is communicated with the recycling water tank, so that the technical problem that the existing desulfurization water treatment system is easy to cause sludge blockage of a pipeline of the equipment is solved.

Description

Desulfurization wastewater treatment system

Technical Field

The invention belongs to the technical field of limestone-gypsum wet desulphurization devices in thermal power plants, and particularly relates to a desulphurization wastewater treatment system.

Background

The energy composition of China is mainly coal which is one of main fuels in power generation of a power plant, and the coal can release a large amount of sulfur dioxide and bring huge damage to the atmospheric environment. Therefore, controlling the sulfur dioxide emissions from thermal power plants is already a serious concern for the environment. Flue gas desulfurization is considered to be the most effective way to control sulfur dioxide emissions. The (limestone/gypsum) desulfurization process in wet desulfurization is the most widely applied and technically mature flue gas desulfurization process in the world at present, and most of desulfurization systems of coal-fired power plants in China adopt the process. In order to effectively maintain the dynamic balance of substances in a desulfurization system, prevent the soluble part in flue gas, namely chlorine concentration from being too high to generate corrosion, ensure the quality of gypsum, ensure the stable quality of slurry of the desulfurization system and ensure the long-period stable operation of the desulfurization system, a certain amount of wastewater is discharged from the system, and the wastewater mainly comes from the wastewater generated by the cleaning operation of a gypsum dehydration system and a pipeline. The impurities contained in the wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, and many of the impurities are the first pollutants which are strictly controlled in the national environmental protection standard.

The traditional desulfurization wastewater treatment system is characterized in that desulfurization wastewater directly and sequentially undergoes neutralization, sedimentation and flocculation after overflowing through a wastewater cyclone, and finally passes through a clarifier to finally recover clear water. The main problems of dewatering by using the traditional desulphurization system are as follows: the slurry is subjected to solid-liquid separation by the centrifugal principle of the wastewater cyclone, and the separated slurry is subjected to wastewater treatment, so that the solid-liquid separation is not thorough, the solid content of the slurry is still higher, the equipment sludge in the desulfurization wastewater treatment system is blocked, the desulfurization wastewater system cannot run reliably and stably for a long period, the slurry quality of the desulfurization absorption tower is unstable, and abnormal conditions such as limited desulfurization efficiency of the system and poor gypsum quality occur.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome traditional desulfurization effluent disposal system and adopt desulfurization waste water to carry out solid-liquid separation through waste water swirler overflow, the separation is not thorough, the thin thick liquid contains solid still than higher, lead to in subsequent effluent treatment process, cause equipment silt to block up easily, the unable long period of desulfurization effluent disposal system problem of reliable operation, a desulfurization effluent disposal system is provided, this system makes solid-liquid separation more thorough on current basis, effectively prevent equipment jam, be favorable to later stage system steady operation.

In order to achieve the technical purpose, the technical scheme of the utility model provides a desulfurization wastewater treatment system, which comprises a vacuum steam-water separator, a wastewater buffer tank, a neutralization water tank, an electronic flocculator, a centrifugal clarifier, an intermediate water tank, a multi-medium filter and a reuse water tank;

the vacuum steam-water separator, the wastewater buffer tank, the neutralizing water tank, the electronic flocculator, the centrifugal clarifier, the middle water tank, the multi-medium filter and the recycling water tank are sequentially connected through pipelines.

The vacuum steam-water separator is characterized by further comprising a filtrate water tank, wherein the discharge end of the vacuum steam-water separator is communicated with the feed end of the wastewater buffer tank through a first pipeline, and a first manual valve is arranged on the first pipeline; the discharge end of the vacuum steam-water separator is communicated with the feed end of the filtrate water tank through a second pipeline, and a second manual valve is arranged on the second pipeline.

Further, all be provided with the agitator in the filtrating water tank with the waste water buffer tank, the agitator is stirred by motor drive.

Furthermore, a control valve is also arranged on a pipeline for communicating the wastewater buffer tank with the neutralization water tank.

Compared with the prior art, the beneficial effects of the utility model include: the utility model provides a desulfurization effluent disposal system, vacuum catch water utilizes the vacuum dehydration principle of disc hydroextractor to carry out solid-liquid separation to waste water, the solid that separates out is mainly the gypsum, calcium carbonate and other materials, liquid is water mainly, the heavy metal that water contains, harmful substance such as dissolved chlorine, improve solid-liquid separation's effect, reduce the solid content in the thin slurry liquid behind the solid-liquid separation, thereby effectively reduce the waste water surge-box, centrifugal clarifier, the stifled mud condition of electron flocculator, reduce the operation risk, guarantee desulfurization waste water long-term steady operation, the environmental protection system safe operation of power plant is ensured effectively.

Drawings

FIG. 1 is a schematic structural view of a desulfurization water treatment system provided by the present invention;

description of reference numerals:

1-vacuum steam-water separator, 2-second manual valve, 3-first manual valve, 4-first stirring rod, 5-filtrate water tank, 6-second stirring rod, 7-wastewater buffer tank, 8-control valve, 9-neutralization water tank, 10-electronic flocculator, 11-centrifugal clarifier, 12-intermediate water tank, 13-multi-medium filter and 14-reuse water tank.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, in order to solve the conventional desulfurization wastewater treatment system process, the original desulfurization wastewater composition is relatively complex and has too high solid content, which results in the blockage of the accumulated mud in the desulfurization wastewater treatment system, the desulfurization wastewater system cannot operate reliably and stably for a long period, which results in the unstable quality of the slurry in the desulfurization absorption tower, and the abnormal conditions of limited desulfurization efficiency, poor quality of gypsum and the like, the embodiment of the utility model provides a desulfurization wastewater treatment system, which comprises a vacuum steam-water separator 1, a wastewater buffer tank 7, a neutralization water tank 9, an electronic flocculator 10, a centrifugal clarifier 11, a middle water tank 12, a multi-media filter 13 and a reuse water tank 14;

the discharge end of the vacuum steam-water separator 1 is communicated with the feeding end of the wastewater buffer tank 7, the discharge end of the wastewater buffer tank 7 is communicated with the feeding end of the neutralization water tank 9, the discharge end of the neutralization water tank 9 is communicated with the feeding end of the electronic flocculator 10, the discharge end of the electronic flocculator 10 is communicated with the feeding end of the centrifugal clarifier 11, the discharge end of the centrifugal clarifier 11 is communicated with the feeding end of the intermediate water tank 12, the discharge end of the intermediate water tank 12 is communicated with the feeding end of the multi-medium filter 13, the discharge end of the multi-medium filter 13 is communicated with the recycling water tank 14, and the communication among all the devices refers to pipeline communication.

The working process of the desulfurization wastewater treatment system is as follows: when desulfurization wastewater discharged from an absorption tower enters a desulfurization wastewater treatment system, solid-liquid separation is firstly carried out on the wastewater through a vacuum steam-water separator 1, the vacuum steam-water separator 1 carries out solid-liquid separation on the wastewater by utilizing the vacuum dehydration principle of a disc dehydrator, the separated solids mainly comprise gypsum, calcium carbonate and other substances, the liquid mainly comprises water, and the water mainly comprises heavy metals, dissolved chlorine and other harmful substances, the separated liquid, namely dilute slurry enters a wastewater buffer tank 7 for preliminary precipitation and buffering, the primarily precipitated wastewater enters a neutralization water tank 9 for neutralization so as to settle heavy metals, the neutralized wastewater enters an electronic flocculator 10, flocs are deposited at the bottom and concentrated into sludge through gravity, and the upper part of the sludge is clear water. The large sludge is discharged to a mortar pond through a sludge pump, and clear water at the upper part enters an intermediate water tank 11 through a pipeline for precipitation, then enters a multi-medium filter 13 for filtration to obtain clear water, and then is recycled to a recycling water tank 14.

The process of the utility model provides a desulfurization wastewater treatment's vacuum catch water handles's desulfurization waste water advance thick liquid suspended solid and obviously reduce, and turbidity ability stable control is below 10, specifically as shown in Table 1. Thereby can effectively reduce the stifled mud condition of waste water buffer tank 7, centrifugal clarifier 11, electron flocculator 10, reduce the operation risk, reduce the risk that the 11 pipe chute of centrifugal clarifier collapses, effectively reduce desulfurization waste water system and overhaul the maintenance cost, guarantee desulfurization waste water long-term steady operation, the environmental protection system safe operation of power plant is ensured effectively.

TABLE 1 adopt the utility model provides a data contrast of desulfurization waste water around vacuum catch water handles

Can find out desulfurization waste water again from table 1 and pass through the utility model provides a processing system's gypsum hydroextractor vacuum catch water handles the back, turbidity greatly reduced is reduced to 16.3 by original 105, it is thus visible, the mode that carries out solid-liquid separation with current waste water swirler overflow to the thick liquid changes vacuum catch water 1 into, improve solid-liquid separation's effect, solid content in the thin thick liquid after the reduction solid-liquid separation, thereby effectively reduce waste water buffer tank 7, centrifugal clarifier 11, the stifled mud condition of electron flocculator 10, can improve equipment's life, reduce the running risk of equipment.

The desulfurization wastewater treatment system further comprises a filtrate water tank 5, the discharge end of the vacuum steam-water separator 1 is communicated with the feed end of the wastewater buffer tank 7 through a first pipeline, and a first manual valve 3 is arranged on the first pipeline; the discharge end of the vacuum steam-water separator 1 of the dewatering machine is communicated with the feed end of the filtrate water tank 5 through a second pipeline, and a second manual valve 2 is arranged on the second pipeline.

The invention also comprises a filtrate water tank 5, a first manual valve 2 and a second manual valve 3 are respectively arranged on a pipeline between the vacuum steam-water separator 1 and the filtrate water tank 5 and a pipeline between the vacuum steam-water separator 1 and the wastewater buffer tank 7, and wastewater subjected to solid-liquid separation by the vacuum steam-water separator 1 can be respectively controlled to enter the filtrate water tank 5 or a wastewater treatment system for further purification treatment by controlling the first manual valve 2 and the second manual valve 3. The novel wastewater treatment system can be added on the basis of not changing the existing treatment system for directly collecting wastewater by adopting the filtrate water tank 5, and is convenient to control and use.

Wherein, all be provided with the agitator in filtrating water tank 5 with waste water buffer tank 7, the agitator is stirred by motor drive. The stirrer is used for stirring at a low speed, so that the solid particulate matters in the wastewater can be further prevented from settling and blocking in the flowing process of the solid particulate matters in the pipeline.

And a control valve 8 is also arranged on a pipeline for communicating the wastewater buffer tank with the neutralization water tank. Through still further set up control valve 8 on waste water buffer tank 7 with the pipeline of neutralization water tank 9 intercommunication can control further neutralization, flocculation and subsequent processing such as clarification of going on of waste water to convenient control is used. The control valve 8 may be selected to be the same manual valve as the first manual valve 3 and the second manual valve 2.

The utility model provides a desulfurization water treatment system can effectively reduce the solid content after the solid-liquid separation, places equipment and pipeline and takes place silt jam at the operation in-process, and improve equipment's life reduces the operation risk.

The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A desulfurization wastewater treatment system is characterized by comprising a vacuum steam-water separator, a wastewater buffer tank, a neutralization water tank, an electronic flocculator, a centrifugal clarifier, an intermediate water tank, a multi-media filter and a reuse water tank;

2. The desulfurization wastewater treatment system of claim 1, further comprising a filtrate water tank, wherein a discharge end of the vacuum steam-water separator is communicated with a feed end of the wastewater buffer tank through a first pipeline, and a first manual valve is arranged on the first pipeline; the discharge end of the vacuum steam-water separator is communicated with the feed end of the filtrate water tank through a second pipeline, and a second manual valve is arranged on the second pipeline.

3. The desulfurization wastewater treatment system of claim 2, wherein stirrers are arranged in both the filtrate water tank and the wastewater buffer tank, and the stirrers are driven by a motor to stir.

4. The desulfurization wastewater treatment system of claim 1, wherein a control valve is further disposed on a pipeline connecting the wastewater buffer tank and the neutralization water tank.