CN114538669A

CN114538669A - Denitration wastewater treatment device of thermal power plant

Info

Publication number: CN114538669A
Application number: CN202210305275.0A
Authority: CN
Inventors: 曾四鸣; 张立军; 刘克成; 牛向楠; 王颖楠; 宫云茜
Original assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd; State Grid Hebei Energy Technology Service Co Ltd
Current assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd; State Grid Hebei Energy Technology Service Co Ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-05-27

Abstract

The invention discloses a denitration wastewater treatment device for a thermal power plant, which comprises a base, and a cyclone separator, a sedimentation tank and a filter box which are sequentially and fixedly arranged on the base, wherein an inlet pipe is arranged on one side of the top of the sedimentation tank, a dosing pipe is arranged on the other side of the top of the sedimentation tank, and an outlet pipe is arranged at the bottom of the sedimentation tank; a transverse filter plate is detachably connected to the upper part in the filter box, and a main liquid outlet is formed in the bottom of the filter box; the top flow pipe of the cyclone separator is communicated with the inlet pipe, second connecting pipes are arranged at the tops of the settling tank and the filtering box, one end of each second connecting pipe is connected with the corresponding outlet pipe, and the other end of each second connecting pipe is communicated with the top of the filtering box. The invention carries out grading treatment on the wastewater generated after denitration in the thermal power plant, and sequentially separates particulate matters and suspended matters in the wastewater, so that the wastewater treatment is more thorough.

Description

Denitration wastewater treatment device of thermal power plant

Technical Field

The invention relates to the technical field of wastewater treatment equipment, in particular to a denitration wastewater treatment device for a thermal power plant.

Background

The electric denitration in the fire plant means that the coal is subjected to denitration treatment in order to prevent excessive NOx generated after the coal in the boiler is combusted from polluting the environment in the thermal power generation.

The method comprises denitration before combustion, denitration during combustion and denitration after combustion. Namely, NOx (nitrogen oxide) in smoke is removed, the substances enter the atmosphere to form acid rain, and the acid rain is extremely harmful to human beings, so that the national advocates environmental protection at present, and the smoke taking coal as fuel contains the substances, especially the smoke of a thermal power plant.

Denitration of thermal power plant can produce waste water, and the suspended solid content in the waste water is great, can't get rid of inside suspended solid in general waste water treatment, therefore waste water treatment is not thorough, does not reach the waste water treatment requirement.

The patent application with publication number CN214495981U discloses an active carbon desulfurization and denitrification wastewater treatment device, which comprises an hourglass-shaped box body, wherein the box body comprises an upper part, a middle part and a lower part, the upper part is provided with a feeding pipe and a PH detector, the upper part is rotatably connected with a three-folding type rotating frame, the bottom of the rotating frame is fixedly connected with a stirring mechanism, and the outer side of the bottom of the upper part is fixedly connected with an oscillator; a filter plate is obliquely inserted in the middle of the filter plate, a plate replacing port is formed in the lower side of the filter plate in the middle of the filter plate, and a sealing door is arranged at the plate replacing port; one side of lower part inner wall articulates there is the left card body, and the opposite side upwards respectively with the downward rigid coupling have the telescopic link, and the output of telescopic link articulates there is the right card body, has pegged graft respectively on the left card body and the right card body and has first active carbon board and second active carbon board, and the lower part is opened between the telescopic link and is had the access hole. This application only adsorbs filtration and handles through the active carbon, because there are many big particulate matters in the waste water, can influence the adsorption effect of active carbon after these big particulate matters are filtered on the active carbon, and then influence waste water treatment's effect.

The patent application with publication number CN208516972U discloses a flue gas desulfurization denitration effluent treatment plant, including flue gas desulfurization denitration effluent treatment ware, bracing piece, locating lever, fixing base, locating piece, slide bar, adapter sleeve. In the technical scheme disclosed in the application, the problem that the wastewater is inconvenient to add medicaments and remove sediments for multiple times exists.

Disclosure of Invention

The invention aims to solve the technical problem of providing a denitration wastewater treatment device for a thermal power plant, which is used for treating wastewater generated by denitration of the thermal power plant in a grading manner so as to solve the problem of incomplete wastewater treatment.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a denitration wastewater treatment device for a thermal power plant comprises a base, and a cyclone separator, a settling tank and a filter box which are sequentially and fixedly arranged on the base, wherein an inlet pipe is arranged on one side of the top of the settling tank, a dosing pipe is arranged on the other side of the top of the settling tank, and an outlet pipe is arranged at the bottom of the settling tank; a transverse filter plate is detachably connected to the upper part in the filter box, and a main liquid outlet is formed in the bottom of the filter box; the top flow pipe of the cyclone separator is communicated with the inlet pipe, second connecting pipes are arranged at the tops of the settling tank and the filtering box, one end of each second connecting pipe is connected with the corresponding outlet pipe, and the other end of each second connecting pipe is communicated with the top of the filtering box.

Furthermore, the top of the settling tank is provided with a first cavity and a second cavity which are mutually independent and closed, the first cavity is communicated with the inlet pipe, the second cavity is communicated with the dosing pipe, the bottom of the first cavity is provided with a downward first nozzle, and the bottom of the second cavity is provided with a downward second nozzle.

Further, jar body top is the head, the bottom surface fixedly connected with bottom plate of head, the bottom plate top is equipped with the baffle with head fixed connection, first cavity is located the top of baffle, the second cavity is located the below of baffle, import pipe and head run through fixed connection, baffle and head all run through fixed connection with the pencil that adds, be equipped with vertical communicating pipe in the second cavity, bottom plate and baffle all run through fixed connection with communicating pipe, first spout is the bottom outlet of communicating pipe bottom, the second spout is the hole that sets up on the bottom plate, the hole communicates the bottom plate from top to bottom, communicating pipe communicates first cavity and bottom plate below.

Further, setting tank bottom center is equipped with first agitator, first agitator is including fixed first motor that sets up in setting tank bottom and the first stirring wheel of setting in the setting tank, first stirring wheel rotates with setting tank bottom to be connected, first motor is connected with first stirring wheel transmission.

Furthermore, a water pump is arranged on the second connecting pipe.

Further, a second stirrer is arranged on the box body, and a stirring wheel of the second stirrer is positioned below the filter plate; the second agitator includes fixed second motor that sets up in rose box one side and sets up the second stirring wheel in the rose box, the second stirs the wheel and rotates with the rose box and be connected, the second motor is connected with the transmission of second stirring wheel.

Further, the first stirring wheel and the first motor are in magnetic coupling transmission.

Further, the second stirring wheel and the second motor are in magnetic coupling transmission.

Furthermore, an acid adding pipe is connected to the filter box.

Furthermore, a circulating pipe is arranged outside the settling tank, a circulating pump is arranged on the circulating pipe, one end of the circulating pipe is communicated with the lower part of the settling tank, and the other end of the circulating pipe is communicated with the upper part of the settling tank.

The invention has the positive effects that:

1. the invention is provided with the cyclone separator, the settling tank and the filter box, so that the wastewater generated after denitration in the thermal power plant is subjected to classification treatment, and particulate matters and suspended matters in the wastewater are sequentially separated, so that the wastewater treatment is more thorough.

2. When being equipped with first agitator on the gunbarrel, first agitator adopts the magnetic coupling transmission, therefore waste water does not exist from the jar of gunbarrel in the risk of leaking through first agitator position.

3. Be equipped with bottom plate, baffle, communicating pipe and hole in the head of gunbarrel, waste water and flocculating agent spout downwards simultaneously, make waste water and flocculating agent advance to appear at the internal mixture more even that advances of jar, and reaction efficiency is higher, has improved waste water treatment's efficiency.

4. When the circulating pump and the circulating pipe are arranged outside the settling tank, the circulating pump and the circulating pipe are arranged outside the tank body, so that the circulating pump can be conveniently maintained after the circulating pump breaks down.

Drawings

FIG. 1 is an external view of example 1;

FIG. 2 is a schematic view of the structure of a cyclone separator in embodiment 1;

FIG. 3 is a schematic structural view of a filtration tank in embodiment 1;

FIG. 4 is a schematic view of the structure of a precipitation tank in example 1;

FIG. 5 is a schematic view of the structure of a precipitation tank in example 2;

FIG. 6 is a schematic view of the structure of a precipitation tank in example 3;

in the figure:

1. a base; 2. an underflow pipe; 3. a tapered barrel; 4. a main liquid inlet pipe; 5. a top flow tube; 6. a first connecting pipe; 7. an inlet pipe; 8. a medicine feeding pipe; 9. a second connecting pipe; 10. a box cover; 11. a filter plate; 12. adding an acid pipe; 13. a second agitator; 14. a box body; 15. a water pump; 16. an outlet pipe; 17. a first stirrer; 18. a tank body; 19. a main liquid outlet; 20. sealing the end; 21. a base plate; 22. an aperture; 23. a communicating pipe; 24. a second cavity; 25. a first cavity; 26. a partition plate; 27. and a circulating pump.

Detailed Description

The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few examples of the present application and are not intended to be exhaustive or all examples. The following description of the embodiments is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in the embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The present invention will be further explained and illustrated with reference to the following specific embodiments and the accompanying drawings, wherein the following embodiments are only preferred embodiments, not all embodiments, and should not be construed as limiting the scope of the present invention.

Example 1

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, a denitration wastewater treatment device for a thermal power plant comprises a rectangular base 1 which is fixedly arranged on the ground and is formed by assembling and welding profile steel, a cyclone separator which is fixedly connected to the base 1 through bolts in sequence from left to right, a vertical cylindrical closed settling tank and a rectangular closed filter box.

The upper part of the settling tank is a semi-ellipsoidal seal head 20, and the lower part of the settling tank is a cylindrical tank body 18. The tank 18 and the end socket 20 are fixedly connected through flanges. The inlet pipe 7 is welded at the left part of the top of the seal head 20, the dosing pipe 8 is welded at the right part of the top of the seal head 20, a valve is arranged on the dosing pipe 8, and the outlet pipe 16 is arranged at the bottom of the tank body 18.

The filter box includes a rectangular box body 14 and a box cover 10 covering the top of the box body 14. The welding of box 14 is being close to upper portion has the angle bar, place horizontal filter 11 on the angle bar, filter 11 right-hand member downward sloping five degrees. The bottom of the box 14 is provided with a main liquid outlet 19. The top flow pipe 5 of the cyclone separator is communicated with the inlet pipe 7, a second connecting pipe 9 is connected between the outlet pipe 16 and the right part of the top of the box body 14, the left end of the second connecting pipe 9 is fixedly connected with the outlet pipe 16, and the right end of the second connecting pipe 9 is communicated with the top of the box body 14.

And a water pump 15 is arranged on the second connecting pipe 9, and the water pump 15 is fixedly connected with the base 1 through bolts.

The side wall on the right side of the box body 14 is fixedly connected with an acid adding pipe 12, and the acid adding pipe 12 is communicated with the lower part of the filter plate 11 in the box body 14.

Denitration waste water enters the conical barrel 3 of the cyclone separator through the main liquid inlet pipe 4 of the cyclone separator along the tangential direction of the conical barrel 3, then rotates in the conical barrel 3, and solid particles with large weight and large volume are thrown to the inner wall of the conical barrel 3 and slide downwards along the inner wall, and are discharged by the underflow pipe 2 arranged at the bottom of the conical barrel 3. The waste water after removing the large particles passes through the top flow pipe 5 at the center of the conical cylinder 3 upwards, passes through the first connecting pipe 6, enters the inlet pipe 7 and then flows into the settling tank. The dosing pipe 8 adds a flocculating agent into the settling tank to condense suspended matters in the wastewater. Under the action of the water pump 15, the wastewater is discharged out of the settling tank through the outlet pipe 16, enters the filter tank through the second connecting pipe 9, is filtered by the filter plate 11, and the condensed suspended matters are left on the filter plate 11. After the box cover 10 is opened, suspended matters flowing down from the filter plates 11 can be cleaned. The treated waste water in the tank 14 can be discharged through the main outlet 19.

The pH value of the filtered wastewater can be adjusted by adding acid into the box body 14 through the acid adding pipe 12, so that the wastewater meets the requirements.

Sedimentation tank bottom center is equipped with first agitator 17, first agitator 17 includes through the first motor of fix with screw setting in the sedimentation tank bottom and sets up the first stirring wheel in the sedimentation tank, first stirring wheel is the frame, first stirring wheel rotates with the central point of the 18 bottoms of the jar body and is connected, first stirring wheel and first motor are magnetic coupling transmission.

After the first stirrer 17 is arranged, the wastewater in the tank body 18 can be fully reacted with the flocculating agent, so that the precipitation effect is improved, the reaction time is shortened, and the wastewater treatment effect and the treatment efficiency are improved finally.

Because the first stirring wheel and the first motor are in magnetic coupling transmission, when the first stirrer 17 is operated, no dynamic sealing fit exists between the tank 18 and the first stirrer 17, and therefore, the wastewater does not risk to leak from the tank 18 through the position of the first stirrer 17.

A second stirrer 13 is arranged on the box body 14, and a stirring wheel of the second stirrer 13 is positioned below the filter plate 11; the second stirrer 13 comprises a second motor fixedly arranged on the right side of the box body 14 and a second stirring wheel arranged in the box body 14, and the second stirring wheel is of a propeller type. The second stirring wheel is rotationally connected with the box body 14, and the second stirring wheel and the second motor are in magnetic coupling transmission.

Similarly, since the second stirring wheel and the second motor are magnetically coupled, when the second stirrer 13 is operated, no dynamic sealing fit exists between the tank 14 and the second stirrer 13, and thus there is no risk of wastewater leaking from the tank 14 through the position of the second stirrer 13.

Example 2

As shown in fig. 5, the present embodiment is different from embodiment 1 in that:

the upper portion of the settling tank is provided with a first cavity 25 and a second cavity 24 which are independent and closed, the first cavity 25 is located above the second cavity 24, the first cavity 25 is communicated with the inlet pipe 7, the second cavity 24 is communicated with the dosing pipe 8, the bottom of the first cavity 25 is provided with a downward first nozzle, and the bottom of the second cavity 24 is provided with a downward second nozzle.

Bottom plate 21 is welded to bottom plate 20's bottom surface, bottom plate 21 top is equipped with baffle 26 with head 20 welded, first cavity 25 is located the top of baffle 26, second cavity 24 is located the below of baffle 26, import pipe 7 runs through the welding with head 20, baffle 26 and head 20 all run through the welding with dosing pipe 8, be equipped with vertical communicating pipe 23 in the second cavity 24, bottom plate 21 and baffle 26 all run through the welding with communicating pipe 23, first spout is the bottom outlet of communicating pipe 23 bottom, the second spout is the hole 22 of setting on bottom plate 21, hole 22 communicates bottom plate 21 from top to bottom, communicating pipe 23 communicates first cavity 25 and bottom plate 21 below, communicating pipe 23 and hole 22 interval set up.

The waste water enters the first chamber 25 through the inlet pipe 7 and is then discharged downward through the communicating pipe 23. After entering the second cavity 24 through the dosing tube 8, the flocculant is sprayed downwards through the holes 22. Waste water and flocculating agent spout downwards simultaneously, and communicating pipe 23 and hole 22 interval set up, therefore waste water and flocculating agent advance the shape in jar body 18 and mix more evenly, and reaction efficiency is higher, has improved waste water treatment's efficiency.

Example 3

As shown in fig. 6, the present embodiment is different from embodiment 1 in that:

a circulating pipe is arranged on the right side of the tank body 18, a circulating pump 27 is arranged on the circulating pipe, the lower end of the circulating pipe is communicated with the lower part of the tank body 18, and the upper end of the circulating pipe is communicated with the upper part of the tank body 18.

After the circulation pump 27 is started, the wastewater in the tank 18 is circulated up and down, so that the wastewater is mixed and reacted with the flocculant added in the dosing pipe 8.

Since the circulation pump 27 and the circulation pipe are provided outside the tank 18, maintenance can be easily performed when the circulation pump 27 malfunctions.

The above-mentioned embodiments are described in detail and specifically for the purpose of illustrating the technical ideas and features of the present invention, and it is an object of the present invention to enable those skilled in the art to understand the contents of the present invention and to implement the same, but not to limit the present invention only by the embodiments, and it is not limited to the scope of the present invention, i.e. equivalent changes or modifications made within the spirit of the present invention, and it is within the scope of the present invention for those skilled in the art to make local modifications within the system and changes or modifications between subsystems without departing from the structure of the present invention. At present, the technical scheme of the application has been subjected to pilot plant test, namely small-scale experiment before large-scale mass production of products; after the pilot test is finished, the investigation for the use of the user is carried out in a small range, and the investigation result shows that the satisfaction degree of the user is higher; now, the production is ready for industrial production.

Claims

1. The denitration wastewater treatment device for the thermal power plant is characterized by comprising a base (1), and a cyclone separator, a sedimentation tank and a filter box which are sequentially and fixedly arranged on the base, wherein an inlet pipe (7) is arranged on one side of the top of the sedimentation tank, a dosing pipe (8) is arranged on the other side of the top of the sedimentation tank, and an outlet pipe (16) is arranged at the bottom of the sedimentation tank; a transverse filter plate (11) is detachably connected to the upper part in the filter box, and a main liquid outlet is formed in the bottom of the filter box; the top flow pipe (5) of the cyclone separator is communicated with the inlet pipe (7), the settling tank and the top of the filtering box are provided with second connecting pipes (9), one end of each second connecting pipe (9) is connected with the corresponding outlet pipe (16), and the other end of each second connecting pipe (9) is communicated with the top of the filtering box.

2. The denitration wastewater treatment device for the thermal power plant as claimed in claim 1, wherein the top of the settling tank is provided with a first cavity (25) and a second cavity (24) which are independent and closed, the first cavity (25) is communicated with the inlet pipe (7), the second cavity (24) is communicated with the dosing pipe (8), the bottom of the first cavity (25) is provided with a downward first nozzle, and the bottom of the second cavity (24) is provided with a downward second nozzle.

3. The denitration wastewater treatment device of the thermal power plant as claimed in claim 2, wherein the top of the tank body (18) is a head (20), the bottom surface of the head (20) is fixedly connected with a bottom plate (21), a baffle plate (26) fixedly connected with the head (20) is arranged above the bottom plate (21), the first cavity (25) is positioned above the baffle plate (26), the second cavity (24) is positioned below the baffle plate (26), the inlet pipe (7) is fixedly connected with the head (20) in a penetrating manner, the baffle plate (26) and the head (20) are fixedly connected with a chemical feeding pipe (8) in a penetrating manner, a vertical communicating pipe (23) is arranged in the second cavity (24), the bottom plate (21) and the baffle plate (26) are fixedly connected with the communicating pipe (23) in a penetrating manner, the first nozzle is a bottom hole at the bottom of the communicating pipe (23), the second nozzle is a hole (22) arranged on the bottom plate (21), the hole (22) communicates the bottom plate (21) up and down, and the communicating pipe (23) communicates the first cavity (25) with the lower part of the bottom plate (21).

4. The denitration wastewater treatment device of the thermal power plant as claimed in claim 1, wherein a first stirrer (17) is arranged at the center of the bottom of the settling tank, the first stirrer (17) comprises a first motor fixedly arranged at the bottom of the settling tank and a first stirring wheel arranged in the settling tank, the first stirring wheel is rotatably connected with the bottom of the settling tank, and the first motor is in transmission connection with the first stirring wheel.

5. The denitration wastewater treatment device of the thermal power plant as claimed in claim 1, wherein a water pump (15) is provided on the second connection pipe (9).

6. The denitration wastewater treatment device of the thermal power plant as claimed in claim 1, wherein a second stirrer (13) is arranged on the box body (14), and a stirring wheel of the second stirrer (13) is positioned below the filter plate (11); the second stirrer (13) comprises a second motor fixedly arranged on one side of the filter box and a second stirring wheel arranged in the filter box, the second stirring wheel is rotatably connected with the filter box, and the second motor is in transmission connection with the second stirring wheel.

7. The denitration wastewater treatment device of the thermal power plant as claimed in claim 4, wherein the first stirring wheel and the first motor are in magnetic coupling transmission.

8. The denitration wastewater treatment device of the thermal power plant as claimed in claim 6, wherein the second stirring wheel and the second motor are in magnetic coupling transmission.

9. The denitration wastewater treatment device of the thermal power plant as claimed in claim 1, wherein an acid adding pipe (12) is connected to the filter box.

10. The denitration wastewater treatment device of the thermal power plant as claimed in claim 1, wherein a circulation pipe is arranged outside the settling tank, a circulation pump (27) is arranged on the circulation pipe, one end of the circulation pipe is communicated with the lower part of the settling tank, and the other end of the circulation pipe is communicated with the upper part of the settling tank.