CN113577937B

CN113577937B - Dust remover and flue gas dust pelletizing system

Info

Publication number: CN113577937B
Application number: CN202111076536.8A
Authority: CN
Inventors: 赖碧伟; 黄志成; 邓晓东; 黄鹏君; 郭燕芳; 鄢小伟
Original assignee: Fujian Longking Co Ltd.
Current assignee: Fujian Longking Co Ltd.
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-07-12
Anticipated expiration: 2041-09-14
Also published as: CN113577937A

Abstract

The invention discloses a dust remover and a flue gas dust removal system, wherein an ash bucket communicated with an internal cavity is arranged at the bottom of a shell of the dust remover, and the cavity is provided with a flue gas inlet and a flue gas outlet which are communicated with a flue; the sliding support is arranged on the inner wall of the chamber between the smoke inlet and the smoke outlet and can be vertically displaced relative to the shell; an openable and closable screen pack is provided on the slide support, the openable and closable screen pack including a plurality of screens, and each of the screens being switchable between a closed operating position and an open operating position with respect to the slide support, and configured to: when the filter screen is positioned in the closed working state, the filter screens are sequentially connected and cover the through-flow section of the shell; and when the filter screens are positioned at the opening working positions, a through-flow channel is formed between every two adjacent filter screens. The invention effectively improves the dust catching and filtering effects by optimizing the scheme, and provides a good technical guarantee for meeting the requirement of emission concentration.

Description

Dust remover and flue gas dust removal system

Technical Field

The invention relates to the field of flue gas dust removal and environment protection, in particular to a dust remover and a flue gas dust removal system.

Background

The existing power plant dust removing equipment generally adopts an electric dust removing device, a bag dust removing device and an electric bag composite dust remover. The electric dust collector and the electric bag composite dust collector have the advantages of low maintenance cost, small running resistance and low cost. The bag dust collector has higher running resistance, higher power consumption and maintenance cost, but has simple structure and high dust collection efficiency, is not influenced by the characteristics of dust in the flue gas, and has more stable discharge.

The discharge electrode, the dust collecting plate and the filter bag for bag dust removal of the electric dust collector are relatively fixed, the passive dust collecting and filtering device belongs to the situation of passive dust collecting and passive dust filtering, conventional dust collecting equipment generally only has once effective dust collecting and filtering effect, and the discharge concentration can not be effectively controlled according to the requirement.

In addition, the ash cleaned during the operation of the flue gas is easily lifted by the ascending flue gas and is collected or escaped again, and particularly, the collection is particularly difficult for the characteristics of small particle size and easy dust emission of fine particle PM2.5, so that the dust is not easy to fall into an ash hopper after ash removal. In the actual dust removal treatment process, the specific treatment can not be carried out according to the components of the fly ash and the condition of the flue gas. In addition, the existing electrostatic fabric filter occupies a large area, various devices of a power plant are numerous, the arrangement is complicated, the dust remover cannot be flexibly arranged, and the cost is too high.

In view of the above, it is desirable to optimize the design of the flue gas dust collector to overcome the above-mentioned drawbacks.

Disclosure of Invention

In order to solve the technical problems, the invention provides a dust remover and a flue gas dust removal system, which effectively improve the dust capturing and filtering effects through scheme optimization and improve good technical guarantee for meeting the emission concentration requirement.

The invention provides a dust remover, which comprises a shell, a sliding support piece and an openable filter screen group, wherein the sliding support piece is arranged on the shell; the bottom of the shell is provided with an ash hopper communicated with the inner cavity, and the cavity is provided with a flue gas inlet and a flue gas outlet which are communicated with a flue; the sliding support is arranged on the inner wall of the chamber between the smoke inlet and the smoke outlet and can be vertically displaced relative to the shell; the openable and closable filter screen set is disposed on the sliding support, the openable and closable filter screen set includes a plurality of filter screens, and each of the filter screens is switchable between a closed operating position and an open operating position with respect to the sliding support, and is configured to: when the filter screen is positioned in the closed working state, the filter screens are sequentially connected and cover the through-flow section of the shell; and when the filter screens are positioned at the opening working positions, a through-flow channel is formed between every two adjacent filter screens.

Optionally, the apparatus further comprises a set of openable baffles disposed on the sliding support on opposite sides of the set of openable screens, the set of openable baffles comprising a plurality of baffles, and each of the baffles being switchable between a closed operating position and an open operating position with respect to the sliding support and configured to: when the shell is in closed operation, the plurality of baffles are sequentially connected and cover the through-flow section of the shell; and when the baffle plates are positioned at the opening working position, a through-flow channel is formed between every two adjacent baffle plates.

Optionally, the sliding support includes two guide rods arranged in parallel, the openable and closable filter screen set is located below the two guide rods, and the openable and closable baffle set is located above the two guide rods; the inner wall of the cavity, opposite to the two ends of the guide rod, of the shell is provided with a movable guide rail, and the two ends of the guide rod are respectively connected with the corresponding movable guide rails; the movable guide rail can be driven by the first driving part to vertically displace so as to drive the guide rod to vertically displace relative to the shell.

Optionally, the openable and closable filter screen group is a louver filter screen group, and the louver filter screen group can be switched between a closed working position and an open working position under the driving of the second driving part; the openable baffle group is a louvered baffle group, and the louvered baffle group can be switched between a closed working position and an open working position under the driving of the second driving part.

Optionally, the peripheral wall of the chamber of the housing is covered with an elastic layer.

Optionally, the elastic layer is a high temperature resistant rubber layer.

Optionally, the dust concentration detection device further comprises a temperature detector and a dust concentration detector which are arranged on the shell, so as to detect the temperature and the dust concentration in the cavity respectively.

The invention also provides a flue gas dust removal system, which comprises the dust remover, wherein a first valve is arranged on the flue gas inlet side of the dust remover, and a second valve is arranged on the flue gas outlet side of the dust remover; the flue gas inlet of the dust remover is provided with a flue gas inlet on the upstream side.

Optionally, the air conditioner further comprises an air storage tank, the air outlet of the compressor and the flue between the first valves are configured in parallel, a third valve is arranged at the air inlet of the air storage tank, and a fourth valve is arranged at the air outlet of the air storage tank.

Optionally, the flue gas dust remover further comprises a buffer tank arranged on the flue on the downstream side of the flue gas outlet of the dust remover.

Compared with the existing dust remover, the invention develops a new way from the aspect of active dust removal and provides the dust remover capable of improving the dust removal efficiency. Specifically, the openable and closable filter screen group is arranged on the sliding support piece and can be vertically displaced relative to the shell under the driving of the sliding support piece; the openable and closable filter screen group comprises a plurality of filter screens, and each filter screen is switchable between a closed working position and an open working position with respect to the sliding support and is configured to: when the filter screen is positioned at the closed working position, the filter screens are sequentially connected and cover the through-flow section of the shell; when the filter screen is positioned at the opening working position, a through-flow channel is formed between two adjacent filter screens. That is to say, the filter screen of this scheme can change its position on flue gas through-flow path as required, possesses the regulating power that can self gesture simultaneously. Compared with the prior art, the invention has the following beneficial technical effects:

firstly, when the dust remover removes dust from flue gas, the sliding support piece drives the openable filter screen group to move downwards, the openable filter screen group is switched to a closed working position at the moment, and the filter screens are sequentially connected to form a filter screen layer covering the through-flow section of the shell; with the downward movement of the filter screen layer, dust is trapped on the lower surface of the filter screen after one-time filtration is completed based on the filtering action of the filter screen. When the smoke dust concentration is high, and smoke needs to be filtered again, the sliding support piece drives the openable filter screen group to move upwards, the openable filter screen group is switched to the opening working position at the moment, the purified smoke flows to the lower part of the openable filter screen group through the through-flow channel between the two adjacent filter screens, and the openable filter screen group moves downwards again to form secondary filtering after being switched to the closing working position; so set up, can realize the multiple filtration deashing, dust collection efficiency can greatly improve.

Secondly, based on the characteristic of vertical displacement of the openable filter screen group, the dust remover can carry out dust removal operation in a static state, namely, the inlet and the outlet of the dust remover can be closed; the ash of comparing in the whereabouts of traditional dust remover will be taken away by the flue gas that rises, and this scheme can further improve deashing efficiency, can effectively avoid the secondary raise dust.

Thirdly, in an alternative of the invention, there is also provided on the sliding support a set of openable shutters including a plurality of shutters, each shutter being switchable between a closed operative position and an open operative position with respect to the sliding support and configured to: when the shell is positioned at the closed working position, the plurality of baffles are sequentially connected and cover the through-flow section of the shell; when the baffle plate is positioned at the opening working position, a through-flow channel is formed between two adjacent baffle plates. According to the arrangement, when the dust remover removes dust from smoke, the openable baffle plate group and the openable filter screen group synchronously move downwards along with the sliding support piece, the openable baffle plate group is kept at an open working position, and the smoke passes through the through-flow channel between two adjacent baffle plates; when the smoke is discharged to the bottom and the emission concentration requirement is met, the openable baffle group is switched to the closed state, and dust at the bottom of the ash hopper can be prevented from being lifted by suction force formed when smoke is released.

Fourthly, based on the configuration of a compressor in the dust removal system, a high-pressure environment can be established in the dust remover, and the normal-pressure environment of the traditional dust remover is abandoned. Through trial production, the volume of the flue gas in the dust remover can be concentrated to 1/5-1/20, namely, the dust concentration in the flue gas to be treated is improved by 5-20 times, and compared with the flue gas with low-concentration dust, the dust removal efficiency is higher; test results show that when the dust concentration in the dust remover reaches the emission requirement of 10mg/N3, the flue gas discharged to the downstream is diluted by 5 to 20 times, the actual emission can reach below 2mg/N3, and the dust removal effect is better.

Fifthly, based on the fact that the volume of the compressed flue gas actually processed is 1/5-1/20 of the volume of the flue gas at the original normal pressure, the floor area of the dust remover is reduced to 1/5-1/20, and the floor area is greatly reduced. So set up, can make things convenient for the on-the-spot to arrange to further reduce cost.

Drawings

FIG. 1 is a flow diagram of a flue gas dust collector system according to an embodiment;

FIG. 2 is a schematic view showing the overall construction of a dust separator according to the embodiment;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of a first operating condition of the dust separator according to the embodiment;

FIG. 5 is a schematic view showing a second operation state of the dust separator according to the embodiment;

fig. 6 is a schematic view showing a third operation state of the dust separator according to the embodiment.

In the figure:

the device comprises a boiler 1, a heat exchanger 2, a denitration device 3, an air preheater 4, a compressor 5, a first valve 61, a second valve 62, a third valve 63, a fourth valve 64, a dust remover 7, an openable and closable baffle group 71, a baffle 711, a guide rod 72, an openable and closable filter screen group 73, a filter screen 731, a shell 74, an elastic layer 741, a dust concentration detector 75, a temperature detector 76, an ash hopper 77, a first driving part 78, a movable guide rail 79, an air storage tank 8, a buffer tank 9, a desulfurization tower 10 and a chimney 11.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Without loss of generality, the system configuration shown in fig. 1 is taken as a description subject of the present embodiment, and the detailed description is directed to the high-pressure dust removal technical scheme. The flue gas dust removal system comprises a boiler 1, a heat exchanger 2, a denitration device 3 and an air preheater 4 which are positioned on the upstream side of a dust remover 7, and further comprises a desulfurization tower 10 and a chimney 11 which are positioned on the downstream side of the dust remover 7. In the present context, the terms "upstream side" and "downstream side" are defined in terms of the direction of flow of the flue gases in the system, i.e. the end close to the boiler 1 is the "upstream side" and the end close to the stack 11 is the "downstream side", it being understood that the use of the terms is only intended to clearly illustrate the working principle of the solution and does not constitute a substantial limitation on the scope of protection claimed by the present application.

As shown in the figure, the present solution is provided with a compressor 5 on the flue of the upstream side of the flue gas inlet of the dust remover 7, and at the same time, the flue gas inlet side of the dust remover 7 is provided with a first valve 61, and the flue gas outlet side of the dust remover 7 is provided with a second valve 62. Therefore, the second valve 62 can be closed first, and the first valve 61 can be closed after the compressor 5 outputs the compressed flue gas to be dedusted to the deduster 7. Thereby establishing a high pressure environment inside the dust separator 7.

When the boiler 1 operates, the generated high-temperature flue gas is cooled by the heat exchanger 2 and then subjected to denitration treatment by the denitration device 3, then the heat exchange is completed by the air preheater 4, the flue gas is compressed by the compressor 5, and the dust collector 7 filters and removes dust from the compressed flue gas.

Simultaneously, this scheme still is provided with the gas holder 8 that matches with compressor 5. As shown in fig. 1, the air receiver 8 is disposed in parallel with the flue between the outlet of the compressor 5 and the first valve 61, and the air inlet of the air receiver 8 is provided with a third valve 63 and the outlet of the air receiver 8 is provided with a fourth valve 64.

When the dust remover 7 removes dust and filters the compressed smoke inside, the first valve 61 and the second valve 62 in front of and behind the dust remover 7 can be closed, the third valve 63 of the air inlet of the air storage tank 8 is opened, and the fourth valve 6 of the air outlet of the air storage tank 8 is closed; thus, when the dust collector 7 removes dust, the flue gas enters the gas storage tank 8 for temporary storage. After the dust removal is finished, the second valve 62 behind the dust remover is opened, after the dust remover 7 discharges the filtered flue gas, the second valve 62 is closed, then the first valve 61 is opened, the fourth valve 6 at the gas outlet of the gas storage tank 8 is opened, the flue gas in the gas storage tank 8 is compressed into the dust remover 7 again under the action of the compressor 5, and therefore the static high-pressure dust removal environment is achieved through circulation.

In this embodiment, a buffer tank 9 is provided downstream of the dust collector 7, and the buffer tank 9 is disposed in the flue on the downstream side of the flue gas outlet of the dust collector 7. Thus, the flue gas discharged from the dust remover 7 is introduced into the buffer tank 9, the buffered flue gas enters the desulfurizing tower 10 for desulfurization, and finally the purified flue gas is discharged through the chimney 11. In this way, the high pressure airflow from the dust separator 7 is prevented from forming an impinging airflow that may damage the backend equipment, such as, but not limited to, the desulfurization tower, the stack, etc. In addition, the influence of the impact airflow on the environment inside the sulfur tower to the desulfurization efficiency can be avoided.

It should be understood that in the process flow of the flue gas dust remover system shown in fig. 1, the specific implementation manner of the boiler 1, the heat exchanger 2, the denitration device 3 and the air preheater 4 on the upstream side of the dust remover 7, and the desulfurization tower 10 and the chimney 11 on the downstream side thereof is not the core invention of the present application, and those skilled in the art can implement the process based on the prior art, so that the detailed description is omitted here.

In this scheme, the filter screen of dust remover 7 can be in the casing displacement for the dust remover can remove dust the operation under static state. In order to describe the technical implementation and technical effect of the dust remover in detail, the following detailed description is made with reference to the accompanying drawings.

Please refer to fig. 2, which is a schematic view of the overall structure of the dust collector according to the present embodiment.

As shown in the figure, the bottom of the housing 74 of the dust remover 7 is provided with an ash hopper 77, and the flue gas to be treated enters the inner chamber thereof through the flue gas inlet a, and is discharged through the flue gas outlet B after reaching the requirement of dust emission concentration. An ash hopper 77 communicates with the interior chamber of the housing 74 to collect the dust captured by the screen and to discharge the ash through an ash conveyor.

Wherein the openable and closable filter screen pack 73 is arranged on a sliding support (72) arranged on the inner wall of the chamber between the flue gas inlet a and the flue gas outlet B and vertically displaceable relative to the housing 74. Thus, when the first valve 61 and the second valve 62 at the inlet and the outlet of the dust remover 7 are closed, that is, when the housing 74 is in a static environment, the openable and closable filter screen set 73 can be displaced relative to the flue gas to be treated, so as to realize the "active" dust collection and filtration.

It is understood that the sliding support for providing the function of vertically displacing the openable and closable filter screen assembly 73 can be implemented in different structural forms, and it is within the scope of the present application to satisfy the above functional requirements.

For example and without limitation, in the alternative exemplary configuration shown in the figures, the sliding support includes two guide rods 72 arranged in parallel, see also fig. 1 and 2, with fig. 2 being a cross-sectional view through C-C of fig. 1.

As shown in the figure, on the inner wall of the chamber of the housing 74 opposite to the two ends of the guide rod 22, there are provided moving guide rails 79, and the two ends of each guide rod 79 are respectively connected to the corresponding moving guide rails 79; here, the moving rail 79 may be vertically displaced by the first driving part 78 to bring about the vertical displacement of the guide rod 72 relative to the housing 74. Preferably, the first driving member 78 is a motor, and it should be understood that the motor and the moving rail are not illustrated in the figure for the sake of simplicity and the driving connection can be realized by those skilled in the art based on the prior art.

Wherein, filter screen group 73 that can open and shut includes a plurality of filter screens 731, and every filter screen 731 can switch between closed work position and open work position for guide arm 72 (sliding support piece), and in this scheme, the filter screen can change its position on the flue gas through-flow path as required, but possesses the regulating power of self gesture simultaneously. Reference is now made to fig. 4 and 5, wherein fig. 4 and 5 show the screens in the closed and open operating positions, respectively, and both are corresponding illustrations taken at the cut-away position B-B shown in fig. 3.

In the closed position, as shown in fig. 4, a plurality of screens 731 are connected in series and cover the flow cross-section of the housing, and each screen 731 is connected in series to form a screen layer covering the flow cross-section of the housing 74. It should be noted that, when forming the filter screen layers, the adjacent filter screens 731 may be overlapped at the adjacent positions shown in fig. 4, and of course, the adjacent filter screens 731 may also be formed into the filter screen layers in a manner of abutting in sequence, as long as the requirement of good filter screen function is satisfied, and the method is not limited to the overlapped connection manner shown in the figures.

As shown in fig. 5, when the filter screen is in the open working position, a through-flow passage is formed between two adjacent filter screens 731. That is, the smoke can relatively flow through the through-flow passages between the screens 731 in this state.

When the dust remover removes dust from the flue gas, the guide rod 22 drives the openable filter screen set 73 to move downwards, the openable filter screen set 73 is switched to the closed working position shown in fig. 4 at the moment, and dust is trapped on the lower surface of the filter screen along with the downward movement of the filter screen layer. If the dust concentration of the flue gas is higher, and the flue gas needs to be filtered again, the guide rod 22 drives the openable and closable filter screen set 73 to move upwards, at this time, the openable and closable filter screen set 73 is switched to the opening working position shown in fig. 5, and the purified flue gas flows to the lower part of the openable and closable filter screen set 73 through the through-flow channel between two adjacent filter screens 731; at this time, the openable and closable filter screen set 73 can be switched to the closed working position, and then moved down again to perform secondary filtration, so that the dust removal efficiency can be improved.

In addition, can carry out the dust removal operation under static state based on dust remover 7, also can all close the exit of dust remover, compare in the ash of traditional dust remover whereabouts and will be taken away by the flue gas that rises, this scheme can effectively avoid the secondary raise dust.

In order to further avoid secondary dust emission, an openable baffle group 71 may be further disposed on the guide rod 22, the openable baffle group 71 includes a plurality of baffles 711, and each baffle 711 is switchable between a closed working position and an open working position with respect to the guide rod 22, please refer to fig. 4, 5 and 6 together, where fig. 4 and 5 each show a state where the baffle is located in the open working position, fig. 6 shows a state where the baffle is located in the closed working position, and fig. 6 is also a corresponding diagram formed in a B-B cut-away position shown in fig. 3.

As shown in fig. 4 and 5, when the shutter 711 is located at the open working position, a through-flow passage is formed between the adjacent shutters 711. The openable/closable baffle group 71 is kept in a flow-through state during the dust removal processing operation. That is, when the dust remover 7 removes dust from flue gas, the openable baffle group 71 and the openable filter screen group 73 synchronously move downwards along with the guide rod 22, and the openable baffle group 71 is always matched with the dust removal operation requirement and is kept in the open working position.

As shown in fig. 6, in the closed operating position, a plurality of baffles 711 are connected in series and cover the flow cross section of the casing 74; similarly, the baffles 711 are connected in series to form a barrier covering the flow cross section of the housing 74. It should be noted that, when forming the shielding layer, the adjacent baffles 711 may be overlapped at the adjacent position shown in fig. 4, and of course, the adjacent baffles 711 may also be formed into the shielding layer by means of abutting joint in sequence, as long as the functional requirement of preventing the smoke from flowing is satisfied, and the method is not limited to the overlapped and connected manner shown in the drawings.

Thus, when the movable baffle group 71 is shifted to the bottom and meets the emission concentration requirement, the movable baffle group 71 is switched to the closed state, and the dust at the bottom of the dust hopper 77 can be prevented from being blown up by the suction force formed when the smoke is released.

Specifically, on the housing 74 of the dust collector, a dust concentration detector 75 and a temperature detector 76 are optionally provided to detect the temperature and the dust concentration in the chamber, respectively. Therefore, comprehensive judgment of the dust removal environment can be automatically realized, on one hand, the dust remover can be ensured to be in a safe and reliable working state, and on the other hand, technical support is provided for improving the dust emission stability.

Optionally, the openable and closable filter screen set 73 is a louvered filter screen set, and specifically may be a louvered structure formed by a plurality of elongated stainless steel filter screens, the thickness of the filter screen 731 is designed as required, preferably not less than 0.5mm, so as to meet the requirement of the strength of the filter screen, and the thicker the filter screen, the better the corresponding filtering effect (the thickness is determined according to the strength and filtering performance, filtering resistance, etc.). When switching to the open work position, the flue gas can wear the passageway between the filter screen and reach the opposite side, and when switching to closed work position, the stainless steel filter screen piece can overlap joint each other, forms sealed filter screen layer, and when the flue gas passed lower part venetian blind type filter screen this moment, can be filtered by the filter screen, and the dust can be caught at the filter screen lower surface. The louvered filter screen assembly is switchable between a closed operating position and an open operating position by a second drive member (not shown).

Optionally, the openable baffle group 71 is a louver type baffle group, specifically, a louver type structure formed by a plurality of strip-shaped stainless steel sheets, when the openable baffle group is switched to the opening working position, smoke can pass through the baffle 711 to reach the other side, and when the openable baffle group is switched to the closing working position, the stainless steel sheets are mutually overlapped to form a sealing structure, so that the smoke cannot pass through; the louvered baffle set is switchable between a closed operating position and an open operating position by a second drive member (not shown). Here, the above driving method can be implemented by those skilled in the art based on the prior art, and therefore, the description thereof is omitted.

It should be noted that the openable and closable filter screen pack 73 is shown below the two guide rods 72, and the openable and closable baffle plate group 71 is shown above the two guide rods 72, and the relative positions are determined based on the structures of the louver screen pack and the louver baffle plate group, and it should be understood that the upper and lower positional relationships of the openable and closable filter screen pack 73 and the openable and closable baffle plate group 71 in the translational switching of the open operating position and the closed operating position with respect to the guide rods 72 are not limited to those shown in the drawings, that is, the openable and closable filter screen pack 73 is located above the two guide rods 72, and the openable and closable baffle plate group 71 is located below the two guide rods 72.

In addition, the chamber peripheral wall of the casing 74 is covered with an elastic layer 741, as shown in fig. 3, the elastic layer 741 is disposed on the inner surface of the dust collector casing 74, and functions to enable the baffle 711 and the filter screen 731 adjacent to the casing 74 to form a pressing seal with the elastic layer 741 based on the characteristic that the elastic layer 741 can be deformed under pressure when the openable and closable baffle 71 and the openable and closable filter screen 73 are closed, so as to prevent the smoke from directly escaping without being filtered. In a specific application, the elastic layer 741 may be made of high temperature resistant rubber, and has a long service life.

The working principle of the dust remover is briefly explained as follows:

1. when the system is started, the second valve 62 at the rear end of the dust remover 7 is closed, and the flue gas is compressed by the compressor 5, so that high pressure is formed inside the dust remover 7; through trial production, the flue gas volume in the dust remover can be concentrated to 1/5-1/20, and the specific compression volume can be determined according to the pressure-resistant strength of the dust remover shell 74. When the compression requirement of the flue gas to be treated is met, the first valve 61 at the front end of the dust remover 7 is closed, and the flue gas at the upstream side of the dust remover 7 is introduced into the gas storage tank 8. Thus, after the dust collector 7 finishes the treatment and the discharge of the flue gas, the fourth valve 64 at the rear end of the gas storage tank 8 and the first valve 61 at the inlet of the dust collector 7 are opened, and the flue gas newly introduced into the gas storage tank 8 and the inlet of the dust collector 7 is treated, so that the circulation is performed.

2. In the dust removing operation stage, when the first valve 61 and the second valve 62 in front of and behind the dust remover 7 are closed, the smoke in the dust remover 7 is in a static state, at this time, the first driving part 78 drives the movable guide rails 79 on both sides of the wall plate of the dust remover shell 74 to move downwards, the movable guide rails 79 drive the guide rods 72 to move downwards, the guide rods 72 drive the openable baffle plate group 71 and the openable and closable filter screen group 73 to move downwards, at this time, the openable and closable baffle plate group 71 is in an open state, and the openable and closable filter screen group 73 is in a closed state (as shown in fig. 4), so that the smoke is filtered by the openable and closable filter screen group 73 and then flows out through the channel formed between the stainless steel sheets in the openable and closable baffle plate group 71, most of dust is trapped on the lower surface of the filter screen by the openable and closable filter screen group 73, the filter screen is opened and incompletely closed quickly, and the dust on the lower surface of the filter screen is separated by centrifugal force, and falls into the ash hopper 77 so that the dust falls into the ash hopper 77 and is transported away by the ash transport device.

When the dust concentration detector 75 detects that the dust concentration in the flue is high and the flue gas needs to be filtered again, the guide rod 72 which is moved to the bottom of the dust remover 7 moves upwards, the openable baffle plate group 71 is in an open state at the moment, and the openable filter screen group 73 is in an open state (as shown in fig. 5), so that the flue gas purified at the upper part flows to a channel formed by the stainless steel sheets in the openable baffle plate group 71 and flows to a channel formed by the filter screens in the openable filter screen group 73, when the openable filter screen group 73 moves to the top of the dust remover 7, the purified flue gas completely flows to the lower part of the openable filter screen group 73, and the openable filter screen group 73 is opened again and moves downwards to form multiple times of filtering.

When the dust concentration detector 75 detects that the dust in the flue gas reaches the emission concentration, the openable baffle group 71 and the openable filter screen group 73 that have moved to the bottom of the dust collector 7 at this time are both in a closed state (as shown in fig. 6) to prevent the suction force generated when the flue gas is released from lifting the dust at the bottom of the dust hopper 77.

3. When the dust in the flue gas in the dust remover reaches below 10mg/N3, the flue gas is discharged at the moment, the second valve 62 at the rear end of the dust remover is opened, the flue gas can be rapidly discharged and enters the buffer tank 9, and the buffered flue gas uniformly enters the rear-end normal pressure equipment. The test result shows that the flue gas is diluted by 5 to 20 times, and correspondingly, the dust in the flue gas after the dust remover is also diluted by 5 to 20 times; therefore, when the dust concentration in the dust remover reaches the emission requirement of 10mg/N3, the actual emission can reach below 2mg/N3, which is far more than the emission requirement of the current standard of 10 mg/N3.

In addition, through the principle of compressed flue gas, make flue gas dust concentration improve 5 to 20 times, for the flue gas dust of low concentration, filterable dust removal effect is better to the compressed flue gas volume of actual processing is flue gas volume 1/5 to 1/20 under the former ordinary pressure, and the area of dust remover can reduce to 1/5 to 1/20, very big reduction area, can make things convenient for the field layout.

It should be noted that the system employed in the embodiment of the present application is configured as follows: the denitration device comprises a heat exchanger 2, a denitration device 3, an air preheater 4, a compressor 5, an air storage tank 8, a buffer tank 9, a desulfurization tower 10 and the like, which are not the core points of the invention, and can be realized by a person skilled in the art based on the prior art, and the details are not repeated herein.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A precipitator, comprising:

the bottom of the shell is provided with an ash bucket communicated with the inner cavity, and the cavity is provided with a flue gas inlet and a flue gas outlet which are communicated with the flue; characterized in that, include in the casing:

a sliding support member disposed on an inner wall of the chamber between the flue gas inlet and the flue gas outlet and vertically displaceable relative to the housing;

an openable and closable screen pack provided on the slide support, the openable and closable screen pack including a plurality of screens, and each of the screens being switchable between a closed operating position and an open operating position with respect to the slide support, and configured to: when the filter screen is positioned in the closed working state, the filter screens are sequentially connected and cover the through-flow section of the shell; and when the filter screens are positioned at the opening working positions, a through-flow channel is formed between every two adjacent filter screens.

2. A precipitator in accordance with claim 1, further comprising:

a set of openable flaps disposed on the slide supports on opposite sides of the set of openable screens, the set of openable flaps including a plurality of flaps, and each flap being switchable between a closed operative position and an open operative position relative to the slide supports and configured to: when the shell is in closed operation, the plurality of baffles are sequentially connected and cover the through-flow section of the shell; and when the baffle plates are positioned at the opening working position, a through-flow channel is formed between every two adjacent baffle plates.

3. A precipitator in accordance with claim 2, in which the sliding support comprises two parallel arranged guide rods, the openable screen pack being located below the two guide rods and the openable baffle pack being located above the two guide rods; the inner wall of the cavity, opposite to the two ends of the guide rod, of the shell is provided with a movable guide rail, and the two ends of the guide rod are respectively connected with the corresponding movable guide rails; the movable guide rail can be driven by the first driving part to vertically displace so as to drive the guide rod to vertically displace relative to the shell.

4. A precipitator in accordance with claim 2 or 3, wherein the openable and closable sets of screens are louvered sets of screens switchable between a closed operating position and an open operating position under the drive of a second drive member; the openable baffle group is a louvered baffle group, and the louvered baffle group can be switched between a closed working position and an open working position under the driving of the second driving part.

5. A precipitator in accordance with claim 4, wherein the chamber peripheral wall of the housing is coated with a resilient layer.

6. A precipitator in accordance with claim 5, wherein the resilient layer is a high temperature resistant rubber layer.

7. A precipitator in accordance with claim 1, further comprising a temperature detector and a dust concentration detector disposed on the housing to detect a temperature and a dust concentration, respectively, within the chamber.

8. A flue gas dust removal system, comprising:

the dust remover as claimed in any one of claims 1 to 7, wherein a first valve is provided at a flue gas inlet side of the dust remover, and a second valve is provided at a flue gas outlet side of the dust remover;

and the compressor is arranged on the flue on the upstream side of the flue gas inlet of the dust remover.

9. The flue gas dedusting system of claim 8, further comprising:

the gas holder, with the gas outlet of compressor with the flue parallel arrangement between the first valve, just the air inlet of gas holder is provided with the third valve, the gas outlet of gas holder is provided with the fourth valve.

10. The flue gas dedusting system of claim 9, further comprising:

and the buffer tank is arranged on the flue on the downstream side of the flue gas outlet of the dust remover.