CN221732809U - Flue gas purification device and flue gas desulfurization and denitrification system - Google Patents

Abstract

The utility model provides a flue gas purification device and a flue gas desulfurization and denitrification system, and relates to the field of environmental protection. The flue gas purifying device comprises first treatment equipment, a flue gas connecting box and second treatment equipment, wherein the first treatment equipment is used for receiving flue gas generated by wet desulfurization, the first treatment equipment comprises a first flue, a flue gas accelerator and a first sewage pool, the flue gas accelerator is arranged at the outlet of the first flue, and the first sewage pool is arranged below the flue gas accelerator; the second treatment equipment comprises a smoke speed reducer, a second flue and a second sewage pool, the smoke speed reducer is arranged at the inlet of the second flue, and the second sewage pool is arranged below the smoke speed reducer; the flue gas connecting box is used for communicating the first treatment equipment with the second treatment equipment, and flue gas flowing out of the first flue flows to the second flue through the flue gas connecting box. The utility model can effectively remove the vapor, dust particles and/or desulfurization and denitrification byproducts carried by the flue gas.

Description

A flue gas purification device and a flue gas desulfurization and denitrification system

Technical Field

The utility model relates to the technical field of environmental protection, in particular to a flue gas purification device and a flue gas desulfurization and denitrification system.

Background Art

Wet flue gas desulfurization equipment is a flue gas treatment technology widely used in thermal power plants, chemical plants and other industrial facilities. Wet flue gas containing sulfur dioxide is mixed with alkaline solutions such as limestone slurry or ammonia water to make sulfur dioxide and alkaline substances react chemically to generate water-soluble sulfites or sulfates, thereby achieving the purpose of desulfurization.

In the process of wet desulfurization and denitrification, flue gas usually carries a large amount of water vapor, which contains smoke particles and desulfurization and denitrification byproducts, thus having an adverse impact on the environment. In order to remove water vapor and particles in flue gas, the traditional treatment method is to use a wet electrostatic precipitator. However, the wet electrostatic precipitator is expensive, consumes a lot of energy, has a complex maintenance process and high operating costs. Therefore, a flue gas purification device is proposed to remove water vapor and desulfurization and denitrification byproducts carried by flue gas.

Utility Model Content

The utility model aims to provide a flue gas purification device and a flue gas desulfurization and denitrification system to solve the problem that the flue gas carries water vapor. The water vapor contains smoke particles and desulfurization and denitrification by-products. The smoke particles and desulfurization and denitrification by-products can be separated from the flue gas by the flue gas purification device.

According to one aspect of the utility model, a flue gas purification device is provided, the flue gas purification device comprising a first processing device, a flue gas connection box and a second processing device, wherein:

The first treatment equipment is used to receive the flue gas generated by wet desulfurization, and the first treatment equipment includes a first flue, a flue gas accelerator and a first sewage pool, the flue gas accelerator is arranged at the outlet of the first flue, and the first sewage pool is arranged below the flue gas accelerator;

The second treatment equipment includes a flue gas decelerator, a second flue and a second sewage pool, wherein the flue gas decelerator is arranged at the entrance of the second flue, and the second sewage pool is arranged below the flue gas decelerator;

The smoke connection box connects the first processing device and the second processing device, and the smoke flowing out of the first flue flows to the second flue through the smoke connection box.

According to some embodiments, the smoke accelerator is a hollow conical barrel structure, the smoke accelerator is connected to the first flue, and the smoke accelerator includes an inlet and an outlet, and the diameter of the inlet is greater than the diameter of the outlet.

According to some embodiments, the smoke decelerator is a hollow conical barrel structure, the smoke decelerator is connected to the second flue, the smoke decelerator includes an inlet and an outlet, and the diameter of the inlet is smaller than the diameter of the outlet;

The cone structure of the smoke reducer, which is narrow at the bottom and wide at the top, has a dust removal umbrella function.

According to some embodiments, the second processing device further comprises:

A dust removal net is installed at the outlet of the second flue.

According to some embodiments, the flue gas purification device further comprises:

The cleaning system provides cleaning water to the dust removal net moved above the cleaning system through a pressure pump, and the sewage after cleaning flows into the second sewage pool.

According to some embodiments, the cleaning system comprises:

A driving device, the driving device comprising an electric lead screw, used to drive the dust removal net to move to a cleaning position;

A cleaning device, the cleaning device comprising a high-pressure nozzle, through which cleaning work is performed;

A sewage pipe, through which sewage generated after cleaning flows into the second sewage pool.

According to some embodiments, the flue gas purification device further comprises:

The sludge filter press is used to separate the sewage in the first sewage pool and the second sewage pool into water and sewage, and the separated grey water is provided to the cleaning system.

According to some embodiments, the second flue is a cylindrical structure, and the diameter of the second flue is greater than the diameter of the flue gas reducer, so that the velocity of the flue gas flowing from the flue gas reducer into the second flue is reduced.

According to some embodiments, the flue gas purification device further comprises:

An induced draft fan is arranged at the outlet of the second flue, and the treated flue gas is discharged under the suction force of the induced draft fan.

According to another aspect of the utility model, a flue gas desulfurization and denitrification system is provided, and the flue gas desulfurization and denitrification system comprises any one of the flue gas purification devices described above.

According to the flue gas purification device of the embodiment of the utility model, the flue gas enters the first treatment equipment, and the flue gas passes through the flue gas accelerator. Under the action of the flue gas accelerator, the flue gas velocity is increased, so that the water vapor and desulfurization and denitrification by-products carried by the flue gas are impacted and deposited in the first sewage pool at the bottom.

According to the flue gas purification device of the embodiment of the utility model, the flue gas passes through the second treatment equipment, and under the action of the flue gas reducer, the water vapor in the flue gas will adhere to the outer wall of the flue gas reducer, and the smoke particles and desulfurization and denitrification by-products that are not completely separated in the flue gas will settle to the inner and outer barrel walls of the flue gas reducer due to gravity, and flow along the barrel wall of the flue gas reducer to the second sewage pool, and the remaining flue gas diffuses to the second flue.

According to the embodiment of the utility model, at the flue gas emission outlet of the flue gas purification device, the flue gas will pass through the dust removal net for the final filtration. The dust removal net can effectively remove the remaining smoke particles in the flue gas, further purify the flue gas, and reduce the emission of pollutants.

It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

FIG1 is a schematic diagram showing the structural composition of a flue gas purification device according to an exemplary embodiment.

FIG2 is a schematic diagram showing a cleaning state of a flue gas purification device according to an example embodiment.

FIG3 shows a schematic plan view of a flue gas purification device according to an example embodiment.

DETAILED DESCRIPTION

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present utility model. However, those skilled in the art will appreciate that the technical solution of the present utility model can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present utility model.

The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations/steps, nor must they be executed in the order described. For example, some operations/steps can be decomposed, and some operations/steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the present invention. As used herein, the term "and/or" includes any one of the associated listed items and all combinations of one or more.

The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this utility model are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present invention, and therefore cannot be used to limit the protection scope of the present invention.

In the technical field related to flue gas purification, a wet electrostatic precipitator is a device that can effectively remove water vapor and particulate matter from flue gas. The wet electrostatic precipitator uses the effect of a high-voltage electrostatic field to charge the particulate matter in the flue gas and capture it on the anode plate under the action of the electric field force. At the same time, a spray system is used to condense the water vapor in the flue gas into droplets and settle them to the bottom of the wet electrostatic precipitator. However, the method of removing smoke impurities using a wet electrostatic precipitator is expensive. Usually, a wet electrostatic precipitator requires the use of high-cost components such as a high-voltage power supply, high-quality electrode materials, and a complex control system. In addition, a wet electrostatic precipitator also consumes a large amount of electricity and water resources during operation, which also increases operating costs.

To this end, the utility model proposes a flue gas purification device, which adopts a double flue design and realizes efficient purification of water vapor and smoke particles and desulfurization and denitrification by-products carried by the flue gas through a flue gas accelerator, a flue gas decelerator and a dust removal net arranged in the flue.

The exemplary embodiments of the present utility model are described below with reference to the accompanying drawings.

FIG1 shows a schematic diagram of the composition of a flue gas purification device according to an example embodiment.

Referring to FIG1 , the flue gas produced by the wet flue gas desulfurization equipment carries water vapor, and the water vapor contains smoke particles and desulfurization and denitrification byproducts, which are removed by the flue gas purification device. The flue gas purification device includes a first treatment device 101, a flue gas connection box 121, a second treatment device 201 and a cleaning system 301. The first treatment device 101 includes a first flue 111, a flue gas accelerator 113 and a first sewage pool 115. The second treatment device 201 includes a flue gas decelerator 211, a second flue 213, a second sewage pool 215 and a dust removal net 217. See FIG3 for a schematic plan view of the flue gas purification device.

According to an exemplary embodiment, the flue gas accelerator 113 is arranged at the outlet of the first flue 111, and the first sewage pool 115 is arranged below the flue gas accelerator 113; the flue gas decelerator 211 is arranged at the entrance of the second flue 213, and the second sewage pool 215 is arranged below the flue gas decelerator 211, and the dust removal net 217 is installed at the outlet of the second flue 213. The flue gas connection box 121 connects the first treatment device 101 and the second treatment device 201. The flue gas generated by wet desulfurization flows into the first treatment device 101, and the flue gas flowing out of the first flue 111 flows to the second flue 213 through the flue gas connection box 121.

The flue gas is subjected to the first stage of treatment in the first treatment device 101 of the flue gas purification apparatus. The flue gas passes through the first flue 111. The flue gas accelerator 113 is connected to the first flue 111. The flue gas accelerator 113 is a hollow conical barrel structure. The end with a large diameter of the flue gas accelerator 113 is the inlet of the flue gas, and the end with a small diameter of the flue gas accelerator 113 is the outlet of the flue gas. The function of the flue gas accelerator 113 is to increase the velocity of the flue gas so that the water vapor, smoke particles and/or desulfurization and denitrification by-products carried by the flue gas can be better separated from the flue gas. The first sewage pool 115 is arranged below the flue gas accelerator 113 so that when the flue gas passes through the flue gas accelerator 113, a part of the smoke particles and/or desulfurization and denitrification by-products are impacted into the first sewage pool 115, and the flue gas water vapor and another part of the smoke particles and/or desulfurization and denitrification by-products are impacted onto the inner wall of the barrel of the flue gas accelerator 113. The mixture of water vapor, smoke particles and/or desulfurization and denitrification by-products in the flue gas then flows along the barrel wall to the first sewage pool 115 at the bottom, and the flue gas flowing out of the first treatment equipment 101 continues to flow along the flue gas connecting box 121 to the second treatment equipment 201.

According to the exemplary embodiment, the flue gas flows out from the first treatment device 101, flows to the second treatment device 201 through the flue gas connection box 121, and performs the second stage of flue gas treatment. The flue gas reducer 211 is connected to the second flue 213, and the flue gas reducer 211 is a hollow conical barrel structure. The end with a small diameter of the flue gas reducer 211 is the inlet of the flue gas, and the end with a large diameter of the flue gas reducer 211 is the outlet of the flue gas. The cone structure of the flue gas reducer 211, which is narrow at the bottom and wide at the top, has the function of a dust removal umbrella. Under the action of the dust removal umbrella, the flue gas forms a rotational motion, and the smoke dust particles, the desulfurization and denitrification byproducts carried by the flue gas, etc. are thrown to the barrel wall, and the function of removing water vapor, smoke dust particles and the desulfurization and denitrification byproducts carried by the flue gas is once again achieved. Clean flue gas enters the upper part of the flue gas reducer. At this time, the flue gas velocity decreases, and a small part of the smoke dust particles and desulfurization and denitrification byproducts carried by the flue gas fall around the outlet of the accelerator. In this way, when the flue gas passes through the flue gas reducer 211, a small portion of the smoke particles and desulfurization and denitrification by-products that are not completely separated will settle to the inner and outer barrel walls of the flue gas reducer 211 due to gravity, and the flue gas water vapor, smoke particles and/or desulfurization and denitrification by-products will flow along the inner and outer barrel walls to the second sewage pool 215 at the bottom.

The flue gas after removing the flue gas water vapor, smoke particles and/or desulfurization and denitrification byproducts again diffuses into the second flue 213 by the flue gas reducer 211. The second flue 213 is a cylindrical structure. The diameter of the second flue 213 is larger than the diameter of the flue gas reducer 211. The flue gas velocity entering the second flue 213 is reduced again. A dust removal net 217 is arranged at the outlet of the second flue 213. The dust removal net 217 mainly processes fine dust particles less than 5 mg/ ^m3 . The dust removal net 217 is cleaned and replaced regularly to ensure that the particle content in the flue gas finally discharged does not exceed the prescribed limit. After being filtered by the dust removal net 217, the flue gas is discharged under the suction of the induced draft fan, which is arranged at the outlet of the second flue 217.

According to some embodiments, excessively high flue gas velocity may cause the captured particulate matter to be lifted up again and re-enter the flue gas flow. Controlling the flue gas velocity can effectively improve the flue gas purification effect. The second flue 213 adopts a large-diameter barrel design to reduce the flue gas flow velocity by increasing the area of flue gas flow. The speed of smoke diffusion to the second flue 213 is reduced to 2m/s. The lower flue gas flow velocity can increase the contact time between smoke particles and the dust removal net 217, thereby improving the dust collection and removal effect of the dust removal net 217.

In this example embodiment, when the flue gas passes through the flue gas accelerator 113 and the flue gas decelerator 211 successively, under the action of impact force and gravity, the water vapor and desulfurization and denitrification by-products carried by the flue gas are settled in the first sewage pool 115 and the second sewage pool 215 below. After the above process, most of the water vapor and particulate matter in the flue gas are removed, achieving preliminary purification of the flue gas. The purified flue gas flows to the dust removal net 217 for final filtration, ensuring that the flue gas finally discharged meets the emission standards stipulated in relevant environmental protection regulations.

FIG2 is a schematic diagram showing a cleaning state of a flue gas purification device according to an example embodiment.

Referring to FIG. 2 , there is shown a schematic diagram of the cleaning state of the flue gas purification device. After the dust removal net 217 has worked for a period of time, smoke particles will adhere to the dust removal net 217. To ensure that the flue gas finally discharged by the flue gas purification device meets environmental protection requirements, an online monitoring system is set in the flue gas purification device. When the online monitoring system detects that the smoke particles in the discharged flue gas exceed 5 mg/m ³ , the cleaning system 301 starts to work and the dust removal net 217 enters the cleaning state.

According to the exemplary embodiment, the cleaning system 301 includes a driving device 311, a cleaning device 313 and a sewage pipe 315. The driving device 311 includes an electric lead screw. When the value of smoke and dust particles displayed by the online monitoring system exceeds the set value, it indicates that the dust removal effect of the dust removal net 217 is reduced and the dust removal net 217 needs to be cleaned. The driving device 311 drives the dust removal net 217 through the electric lead screw to pull the dust removal net 217 out of the second processing device 201 in parallel to the position of the cleaning device 313. The cleaning device 313 includes a high-pressure nozzle, and the dust removal net 217 is cleaned by the high-pressure nozzle. After cleaning, the dust removal net 217 is restored to the original position of the second processing device 201 by the driving device 311. The sewage generated by cleaning flows into the second sewage pool 215 through the sewage pipe 315. The sewage flowing into the second sewage pool 215 can be recycled for the cleaning system 301 after treatment.

The flue gas purification device further includes a sludge filter press, which is used to separate the sewage in the first sewage pool 115 and the second sewage pool 215 into water and sewage, and the separated reclaimed water is provided to the cleaning system 301. The sludge filter press is used to remove smoke particles and desulfurization and denitrification byproducts dissolved in the first sewage pool 115 and the second sewage pool 215. According to some embodiments, the sludge filter press filters the sewage containing smoke particles and desulfurization and denitrification byproducts by physical and chemical methods, and the solid particles in the sewage are separated, and the reclaimed water after water and sewage separation is provided to the cleaning system 301 for recycling.

According to the exemplary embodiment, the monitoring data of the online monitoring system is provided by a detection probe arranged in the flue gas purification device, and the detection probe is connected to the online monitoring system to ensure that the flue gas discharged meets the environmental protection requirements. The detection probe is specially used to measure the flue gas composition and parameters, directly contacts the flue gas, can quickly and accurately obtain real-time data, and can monitor the concentration of various particulate matter in the flue gas in real time. The detection probe arranged inside the second flue 213 is used to monitor the concentration of soot particles in the flue gas after preliminary purification in real time. The concentration of soot particles in the flue gas in the second flue 213 has dropped to 5mg/ ^m3 , which is far lower than the general emission limit of 50mg/ ^m3 for particulate matter in GB 16297-2004 "Comprehensive Emission Standard of Air Pollutants". The detection probe installed at the outlet of the second flue 213 is used to monitor the concentration of smoke particles discharged into the air in real time. At the same time, the concentration of smoke particles here can directly reflect the filtering effect of the dust removal net 217 installed at the outlet of the second flue 213. When the monitoring data of the online monitoring system shows that the concentration of the discharged smoke particles exceeds the set value of 5mg/ ^m3 , the cleaning system 301 is started to clean the dust removal net 217. The monitoring value set by the online monitoring system, for the ultra-low emission requirement of the particle emission concentration reduced to below 10mg/m3, the flue gas purification device also meets the emission standard.

In this example embodiment, the concentration of emitted smoke particles is detected in real time through an online monitoring system. When the monitoring data exceeds the specified limit, the cleaning system is triggered to start, and the high-pressure nozzle of the cleaning device is used to remove the particles and pollutants attached to the dust removal net, thereby ensuring the purification effect of the dust removal net.

The wastewater generated by the flue gas purification device in the cleaning process of this embodiment will be collected through the sewage pipe and flow into the second sewage pool. The wastewater is filtered and treated by the sludge filter press, and the purified reclaimed water is recycled and reused in the cleaning system, realizing the recycling of water resources.

In this example embodiment, the setting of the online monitoring system can not only automatically control the cleaning process of the flue gas purification device, but also facilitate the enterprise to monitor the flue gas emission in real time to ensure that it complies with the requirements of environmental protection laws and regulations. At the same time, the government environmental protection department can also access the enterprise's environmental protection platform to retrieve the enterprise's flue gas emission data records, thereby achieving more effective supervision.

In this example embodiment, in the flue gas purification device and the flue gas desulfurization and denitrification system, the design part of the first treatment device and the second treatment device adopts natural physical processes such as centrifugal force and gravity to treat the flue gas, and the operating energy consumption of the entire system is reduced, which is more energy-saving and environmentally friendly. The sludge filter press is used to filter and purify the sewage, and the separated water can be recycled. The use of the sludge filter press to treat the sewage can reduce the water consumption of the entire system, complete the collection, discharge and recycling of sewage in a fixed space, improve the working efficiency of the system and save costs.

Those skilled in the art can clearly understand that the technical solution of the utility model can be implemented with the help of software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware that can independently complete or cooperate with other components to complete specific functions.

It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should know that the utility model is not limited by the described action sequence, because according to the utility model, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the utility model.

In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

In the several embodiments provided by the present utility model, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended clauses.

Claims (10)

1. The utility model provides a flue gas purification device for desorption vapor, smoke and dust particulate matter and/or SOx/NOx control accessory substance that flue gas carried, its characterized in that, flue gas purification device includes first treatment facility, flue gas connection case and second treatment facility, wherein:

The first treatment equipment is used for receiving flue gas generated by wet desulfurization, and comprises a first flue, a flue gas accelerator and a first sewage pool, wherein the flue gas accelerator is arranged at the outlet of the first flue, and the first sewage pool is arranged below the flue gas accelerator;

The second treatment equipment comprises a smoke speed reducer, a second flue and a second sewage pool, wherein the smoke speed reducer is arranged at the inlet of the second flue, and the second sewage pool is arranged below the smoke speed reducer;

The flue gas connecting box is used for communicating the first treatment equipment with the second treatment equipment, and flue gas flowing out of the first flue flows to the second flue through the flue gas connecting box.

2. The flue gas cleaning device according to claim 1, wherein the flue gas accelerator has a hollow cone-shaped barrel structure, the flue gas accelerator is connected with the first flue, the flue gas accelerator comprises an inlet and an outlet, and the diameter of the inlet is larger than that of the outlet.

3. The flue gas cleaning device according to claim 1, wherein the flue gas decelerator is in a hollow cone-shaped barrel structure, the flue gas decelerator is connected with the second flue, the flue gas decelerator comprises an inlet and an outlet, and the diameter of the inlet is smaller than that of the outlet;

The cone structure with the narrow lower part and the wide upper part of the flue gas reducer has the function of a dust removing umbrella.

4. The flue gas cleaning apparatus according to claim 1, wherein the second treatment device further comprises:

the dust removing net is arranged at the outlet position of the second flue.

5. The flue gas cleaning device according to claim 4, further comprising:

and the cleaning system is used for providing cleaning water for the dust removal net which moves to the upper part of the cleaning system through a pressure pump, and the cleaned sewage flows into the second sewage tank.

6. The flue gas cleaning device according to claim 5, wherein the cleaning system comprises:

The driving device comprises an electric screw rod and is used for driving the dust removing net to move to a cleaning position;

The cleaning device comprises a high-pressure spray head, and cleaning work is carried out through the high-pressure spray head;

and sewage generated after cleaning flows into the second sewage pool through the sewage drain.

7. The flue gas cleaning device according to claim 1, further comprising:

And the sludge filter press is used for separating water from sewage in the first sewage tank and the second sewage tank, and the separated reclaimed water is provided for the cleaning system.

8. A flue gas cleaning device according to claim 3, wherein,

The second flue is of a barrel-shaped structure, and the diameter of the second flue is larger than that of the flue gas speed reducer, so that the speed of flue gas flowing into the second flue from the flue gas speed reducer is reduced.

9. The apparatus as recited in claim 1, further comprising:

And the induced draft fan is arranged at the outlet of the second flue, and the treated flue gas is discharged under the suction force of the induced draft fan.

10. A flue gas desulfurization and denitrification system, characterized by comprising the flue gas cleaning device according to any one of claims 1 to 9.