CN212467704U

CN212467704U - Coal-fired power plant flue gas desulfurization repurification system

Info

Publication number: CN212467704U
Application number: CN202020950240.9U
Authority: CN
Inventors: 孟蓬强
Original assignee: NANJING GENERAL ELECTRIC EQUIPMENT CO Ltd
Current assignee: NANJING GENERAL ELECTRIC EQUIPMENT CO Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-02-05
Anticipated expiration: 2030-05-29

Abstract

The utility model discloses a coal fired power plant flue gas desulfurization after clean system again, including the desulfurizing tower, be close to below position in the desulfurizing tower and be provided with the desulfurization and spray the layer, the top that the desulfurization sprayed the layer is provided with desulfurization defogging layer, the top on desulfurization defogging layer is provided with the defroster and washes the frame, the position defroster washes frame top position in the desulfurizing tower is provided with two minutes rooms, two all be provided with wet electrostatic precipitator in the branch room, two all be provided with first mount in the wet electrostatic precipitator. The utility model discloses in, can carry out desulfurization filtration treatment with the flue gas that the coal-fired produced through the desulfurizing tower structure that sets up, through the wet electrostatic precipitator who sets up, can carry out secondary purification work, through the locellus partition structure that sets up, can reduce the negative pole and hang the upper and lower frame size, make its structure more stable, increase the rigidity and the stability of structure simultaneously, the cooperation of partition structure also can guarantee that overall structure can not lead to the filtration efficiency to descend because of the step-down problem.

Description

Coal-fired power plant flue gas desulfurization repurification system

Technical Field

The utility model relates to a purify technical field, especially relate to a coal fired power plant flue gas desulfurization after clean system again.

Background

After wet desulphurization of flue gas of some power plants, residual smoke dust in the flue gas and gypsum dust carried in the desulphurization process can not meet the flue gas emission requirement, and gypsum rain can be formed in the surrounding area of the power plants after the flue gas is discharged, so that the pollution is very serious, and the requirement of the modern power plants on environmental protection can not be met.

The wet electrostatic dust collector technology is an ultimate means in the flue gas purification process of a coal-fired thermal power plant, is an effective technology capable of enabling smoke dust in the flue gas of the coal-fired thermal power plant to be in zero emission, and can reduce emission of hundreds of tons of smoke dust for each coal-fired unit every year.

However, the arrangement of wet electrostatic dust collectors is often limited in some power plants, no independent equipment field exists, and most of domestic coal-fired power plants adopt a desulfurization tower top arrangement mode at present, and the arrangement mode has the advantages of no land occupation, compact structure, low manufacturing cost and the like, and has the defects that a cathode hanging point cannot be established in the equipment center of the wet electrostatic dust collectors, the power supply partition span is too large (generally more than 20m), the length-width ratio is unreasonable (generally about 10: 1), the cathode transverse swing amplitude is large under the influence of airflow, and serious breakdown discharge problems can be caused, so that secondary voltage and secondary current which cannot reach the design are mostly existed, and the problem that the dust collection efficiency cannot reach the design is directly reflected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a coal-fired power plant flue gas desulfurization and then purification system.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a coal-fired power plant flue gas desulfurization and purification system comprises a desulfurization tower, wherein a desulfurization spraying layer is arranged in the desulfurization tower close to the lower position, a desulfurization and demisting layer is arranged above the desulfurization spraying layer, a demister washing frame is arranged above the desulfurization and demisting layer, two sub-chambers are arranged above the demister washing frame in the desulfurization tower, wet electrostatic precipitators are arranged in the two sub-chambers, a first fixing frame is arranged in each of the two wet electrostatic precipitators, a plurality of anode systems are arranged on each of the two first fixing frames, a second fixing frame is arranged in each of the two wet electrostatic precipitators at a position corresponding to the first fixing frame, a cathode system is arranged in each of the two second fixing frames at a position corresponding to the anode system, and a high-voltage power supply is arranged in each of the desulfurization tower at a position corresponding to the two sub-chambers, and a spraying and washing frame is arranged above the two sub-chambers in the desulfurizing tower.

As a further description of the above technical solution:

and an air inlet is arranged on one side of the outer surface of the desulfurizing tower and below the desulfurizing spraying layer.

As a further description of the above technical solution:

and a sewage draining outlet is formed in one side of the outer surface of the desulfurizing tower, which is close to the bottom.

As a further description of the above technical solution:

and sealing sleeves are arranged on the outer surface of the desulfurizing tower and the positions corresponding to the two sub-chambers.

As a further description of the above technical solution:

a channel is arranged between the two subchambers.

As a further description of the above technical solution:

and the top of the desulfurizing tower is provided with an air outlet.

The utility model discloses following beneficial effect has:

the coal-fired power plant flue gas desulfurization and purification system can perform desulfurization treatment on coal-fired flue gas through the arrangement of an integral structure, can perform purification treatment through an arranged wet electrostatic dust collector, and can also be provided with a channel in the center of the wet electrostatic dust collector through an arranged chamber partition unit structure, so that the span of a power supply partition is generally more than 12m, the length-width ratio is generally about 4:1, the stability of the structure and the dust removal performance is very high, the designed secondary voltage and secondary current can be continuously and stably achieved, the actual dust removal efficiency can be effectively guaranteed, and the system also has the following advantages:

1. because the desulfurized wet flue gas has corrosivity, a large amount of high-grade stainless steel materials (over 316L) are used inside, and the arrangement scheme can reduce the using amount of the stainless steel materials.

2. The arrangement scheme of the compartment partition units can effectively reduce the sizes of upper and lower frames hung by a single cathode system, the length-width ratio of the upper and lower frames is in a certain range, the hanging points of each power supply partition are 3-4 (the current scheme in China is mostly 2 hanging points), the rigidity and the stability of the hanging points are greatly improved, and therefore the cathode and the anode of the wet electrostatic dust collector (the different polar distance is kept stable) are enabled to stably operate electric fields of all the partitions.

3. The arrangement scheme of the compartment partition unit can reduce the influence of washing on the electric field, can realize that the electric field is not washed by depressurization, can make the water drops (water mist) sprayed evenly adsorbed on the anode tube (anode plate) by using a small amount of water, forms an even water film on the anode, makes the adsorbed smoke dust and gypsum dust washed cleanly, and can not cause the condition of reducing the dust removal efficiency due to individual partition depressurization (power failure) in the washing process.

Drawings

FIG. 1 is a schematic structural view of a system for re-purifying flue gas of a coal-fired power plant after desulfurization;

FIG. 2 is a sectional cathode hanging diagram of the re-purification system after flue gas desulfurization in a coal-fired power plant according to the present invention.

Illustration of the drawings:

1. a desulfurizing tower; 2. an air inlet; 3. a sewage draining outlet; 4. a desulfurization spray layer; 5. a desulfurization and demisting layer; 6. a demister washing frame; 7. dividing the chamber; 8. a wet electrostatic precipitator; 9. a first fixing frame; 10. an anode system; 11. a second fixing frame; 12. a cathode system; 13. sealing sleeves; 14. a high voltage power supply; 15. a channel; 16. spraying and washing the rack; 17. and an air outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-2, the present invention provides an embodiment: a coal-fired power plant flue gas desulfurization and purification system comprises a desulfurization tower 1, a desulfurization spraying layer 4 is arranged in the desulfurization tower 1 and close to the lower position, a desulfurization and demisting layer 5 is arranged above the desulfurization spraying layer 4, a demister washing frame 6 is arranged above the desulfurization and demisting layer 5, two sub-chambers 7 are arranged above the demister washing frame 6 in the desulfurization tower 1, wet electrostatic precipitators 8 are arranged in the two sub-chambers 7, first fixing frames 9 are arranged in the two wet electrostatic precipitators 8, a plurality of anode systems 10 are arranged on the two first fixing frames 9, second fixing frames 11 are arranged in the two wet electrostatic precipitators 8 and correspond to the first fixing frames 9, cathode systems 12 are arranged in the two second fixing frames 11 and correspond to the anode systems 10, and high-voltage power supplies 14 are arranged on the desulfurization tower 1 and correspond to the two sub-chambers 7, and a spray washing frame 16 is arranged above the two sub-chambers 7 in the desulfurizing tower 1.

A gas inlet 2 is arranged on one side of the outer surface of the desulfurizing tower 1 and below the desulfurizing spray layer 4, the gas inlet 2 can be communicated with a flue gas pipe of a coal-fired power plant, and the generated flue gas can be conveyed into the desulfurizing tower 1 for filtering and purifying treatment; a sewage discharge outlet 3 is arranged at a position, close to the bottom, on one side of the outer surface of the desulfurizing tower 1, sewage desulfurized by the desulfurizing tower 1 is conveyed into the precipitation filtering structure from the sewage discharge outlet 3, sewage treatment work is carried out on the sewage mixed with dust, the environment is prevented from being polluted, a sealing sleeve 13 is arranged at a position, corresponding to the two chambers 7, on the outer surface of the desulfurizing tower 1, the problem of large partition span can be effectively solved through the arrangement of the two chambers 7, the size of an upper frame and a lower frame required by cathode suspension can be effectively reduced, and the stability of the structure is effectively ensured; a channel 15 is arranged between the two sub-chambers 7, and the sub-chambers 7 can be operated in a partitioning mode through the arrangement of the channel 15; the top of the desulfurizing tower 1 is provided with an air outlet 17, which can discharge the retreated waste gas after secondary filtration.

The working principle is as follows: when using coal fired power plant flue gas desulfurization after clean system again, the flue gas passes through in 2 entering desulfurizing tower 1 of air inlet, spray spraying of layer 4 through the desulfurization, can carry out primary filtration treatment, the desulfurization defogging layer 5 that removes carries out the defogging and handles, the defogging is accomplished the back and is washed frame 6 through the defroster and carry out defogging and wash the processing work, accomplish through wet electrostatic precipitator 8 in the locellus 7, provide the power for anode system 10 through high voltage power supply 14, anode system 10 and cathode system 12 cooperation, can adsorb the dust granule on the positive pole inner wall, the rethread sprays and washes the spraying of washing frame 16, can realize repurifying's purpose, the air that the purification was accomplished at last is discharged from gas outlet 17 and is got.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a coal fired power plant flue gas desulfurization after clean system, includes desulfurizing tower (1), its characterized in that: a desulfurization spraying layer (4) is arranged in the desulfurization tower (1) and close to the lower position, a desulfurization demisting layer (5) is arranged above the desulfurization spraying layer (4), a demister washing frame (6) is arranged above the desulfurization demisting layer (5), two sub-chambers (7) are arranged above the demister washing frame (6) in the desulfurization tower (1), wet electrostatic precipitators (8) are arranged in the two sub-chambers (7), first fixing frames (9) are arranged in the two wet electrostatic precipitators (8), a plurality of anode systems (10) are arranged on the two first fixing frames (9), second fixing frames (11) are arranged in the two wet electrostatic precipitators (8) and correspond to the first fixing frames (9), and cathode systems (12) are arranged in the two second fixing frames (11) and correspond to the anode systems (10), the desulfurization tower (1) is provided with high voltage power supply (14) at the position corresponding to the two sub-chambers (7), and spray washing frames (16) are arranged above the two sub-chambers (7) in the desulfurization tower (1).

2. The system of claim 1, wherein the system comprises: and a gas inlet (2) is arranged on one side of the outer surface of the desulfurizing tower (1) and below the desulfurizing spraying layer (4).

3. The system of claim 1, wherein the system comprises: and a sewage draining outlet (3) is arranged at one side of the outer surface of the desulfurizing tower (1) close to the bottom.

4. The system of claim 1, wherein the system comprises: and a sealing sleeve (13) is arranged on the outer surface of the desulfurizing tower (1) at a position corresponding to the two sub-chambers (7).

5. The system of claim 1, wherein the system comprises: a channel (15) is arranged between the two subchambers (7).

6. The system of claim 1, wherein the system comprises: and the top of the desulfurizing tower (1) is provided with an air outlet (17).