CN216223660U - Tail gas treatment system - Google Patents

Abstract

The application discloses tail gas treatment system relates to the environmental protection equipment field. A tail gas treatment system comprises a fly ash collecting assembly, wherein the fly ash collecting assembly comprises an electric dust remover, a first ash conveying pipeline and a buffer bin; the stirrer is arranged at the downstream of the buffer bin; the dosing assembly is connected with the stirrer and is used for applying a medicament for modifying the fly ash into the stirrer so as to mix the medicament and the fly ash in the stirrer to form modified fly ash; the drier is arranged at the downstream of the stirrer; a grinder disposed downstream of the dryer; the collecting bin is arranged at the downstream of the grinding machine; and the injection assembly is arranged at the downstream of the collection bin and used for injecting the modified fly ash in the collection bin to the flue. The application can solve the problems of low demercuration efficiency and high operation cost of the activated carbon.

Description

Tail gas treatment system

Technical Field

The application belongs to the technical field of environmental protection equipment, concretely relates to tail gas treatment system.

Background

With the stricter environmental protection policy, the emission standard of atmospheric pollutants makes clear requirements on the emission concentration of mercury in coal tail gas. At present, some tail gas treatment systems adopt the activated carbon adsorption mode to realize demercuration, however, the demercuration efficiency of activated carbon is not high, and the activated carbon needs to be changed, resulting in relatively high system operation cost. Therefore, the development of the efficient and low-cost deep mercury removal technology is of great significance for controlling the emission of the mercury in the coal-fired tail gas.

SUMMERY OF THE UTILITY MODEL

The purpose of the embodiment of this application is to provide a tail gas treatment system, can solve the not high, higher problem of running cost of active carbon demercuration efficiency.

In order to solve the technical problem, the present application is implemented as follows:

the embodiment of the application provides a tail gas treatment system, and this tail gas treatment system includes:

the device comprises a fly ash collecting assembly, a tail gas collecting assembly and a tail gas collecting assembly, wherein the fly ash collecting assembly comprises an electric dust remover, a first ash conveying pipeline and a buffer bin, the electric dust remover is arranged on a flue for outputting tail gas, and the electric dust remover is connected with the buffer bin through the first ash conveying pipeline;

the stirrer is arranged at the downstream of the buffer bin and is used for receiving the fly ash conveyed by the buffer bin;

the agent output end of the agent adding component is connected with the stirrer and is used for applying an agent for modifying the fly ash into the stirrer so as to mix the agent with the fly ash in the stirrer to form modified fly ash;

a dryer disposed downstream of the blender to dry the modified fly ash;

a grinder disposed downstream of the dryer to grind the modified fly ash;

a collection silo disposed downstream of the mill to store the pulverized modified fly ash;

an injection assembly disposed downstream of the collection bin to inject the modified fly ash within the collection bin to the flue.

In the embodiment of the application, the fly ash in the tail gas is collected by the fly ash collecting component and is conveyed to the stirrer, and meanwhile, the modified medicament is applied to the stirrer, and the fly ash and the medicament are mixed with each other under the stirring action of the stirrer, so that the modified fly ash is formed; the modified fly ash is dried by a dryer and ground by a grinding machine to obtain more active surfaces, and the modified fly ash collected by the collection bin is sprayed to the flue by the spraying component, so that the modified fly ash can adsorb mercury in tail gas, and the effect of removing mercury is achieved. Compared with the mode of activated carbon demercuration, in the application, the fly ash in the tail gas is collected and modified to obtain modified fly ash, so that the modified fly ash is used as an adsorbent to adsorb mercury in the tail gas, and the adsorbent is not required to be additionally added, thereby greatly reducing demercuration cost under the condition of ensuring demercuration effect and ensuring demercuration efficiency.

Drawings

FIG. 1 is a schematic view of an exhaust treatment system disclosed in an embodiment of the present application.

Description of reference numerals:

11-a boiler; 12-a flue; 13-a draught fan; 14-a desulfurization tower; 15-a chimney;

21-an electric dust collector; 211-electric field ash bucket; 22-a first ash conveying line; 221-ash conveying main line; 222-a first ash conveying branch; 223-a second ash conveying branch line; 224-a first control valve body; 225-a second control valve body; 226-electric field bin pump; 227-a third control valve body; 23-a surge bin; 24-a second ash conveying line; 25-ash storehouse;

31-a stirrer; 32-weighing screw conveyor; 33-a dryer; 34-a grinder;

41-a kit; 42-a dosing pump;

51-a cyclone separator; 52-bag dust collector;

61-a first conduit; 62-a first tail gas regulating valve; 63-a second conduit; 64-a second tail gas regulating valve;

71-a collection bin;

81-jetting assembly.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

As shown in FIG. 1, the embodiment of the present application discloses an exhaust gas treatment system, which comprises a fly ash collecting assembly, a blender 31, a dosing assembly, a dryer 33, a grinder 34, a collecting bin 71 and a spraying assembly 81.

Wherein, the flying dust collection assembly mainly used collects the flying dust in the tail gas, and the flying dust collection assembly includes electrostatic precipitator 21, first ash conveying pipeline 22 and surge bin 23, and electrostatic precipitator 21 sets up on the flue 12 that is used for exporting tail gas, can be with flying dust and gas separation and the storage in the tail gas through electrostatic precipitator 21. The electric dust collector 21 is connected with the buffer bin 23 through a first ash conveying pipeline 22.

Alternatively, the inlet of the flue 12 is connected to the boiler 11 so that the exhaust gas generated when the boiler 11 is operated can be output through the flue 12. Before the tail gas is discharged, the tail gas also needs to be subjected to desulfurization treatment, on the basis of the desulfurization treatment, the flue 12 is provided with the desulfurization tower 14, and the tail gas is subjected to desulfurization process when passing through the desulfurization tower 14, so that the sulfur in the tail gas can be reduced, and the pollution of the tail gas to the environment is reduced. After the exhaust gas in the flue 12 is subjected to a plurality of treatment processes, the exhaust gas is finally discharged to the outside air through a chimney 15 arranged at the end of the flue 12. In order to enable the tail gas to flow smoothly in the flue 12, an induced draft fan 13 can be further arranged on the flue 12, and the induced draft fan 13 can accelerate the flow speed of the tail gas, so that the tail gas has certain pressure and flow speed, certain flow is guaranteed, and the tail gas can be discharged smoothly.

In order to collect the fly ash in the exhaust gas, in the embodiment of the present application, an electric dust collector 21 is disposed on the flue 12, and multiple sets of electric dust collectors 21 may be disposed. Alternatively, a plurality of electric precipitators 21 may be connected in parallel in the flue 12, so that the exhaust gas may be ash-removed separately without reducing the flow speed of the exhaust gas. Of course, a plurality of electric dust collectors 21 can be connected in series in the flue 12, and at this time, a plurality of fly ash removal processes can be performed on the tail gas.

The fly ash removed via the electric dust collector 21 may be stored in the electric dust collector 21 and transported via the first ash transport line 22. The first ash conveying pipeline 22 may be connected to the surge bin 23, so that the fly ash collected by the electric dust collector 21 may be conveyed to the surge bin 23 to supply the fly ash for a subsequent process. In order to make the fly ash flow smoothly in the first ash conveying pipe 22, the first ash conveying pipe 22 may be provided with a port for inputting pressure air, and the port is connected with a pressure air input device. In this way, under the driving action of the pressurized air, the fly ash can flow into the surge bin 23 along the first ash conveying line 22 and be stored through the surge bin 23.

In order to modify fly ash, it is necessary to apply a modifying agent to the fly ash so that the fly ash becomes modified fly ash. Based on this, in the present embodiment, a stirrer 31 is provided downstream of the surge bin 23 so that the fly ash in the surge bin 23 can be conveyed into the stirrer 31. In the embodiment of the present application, the modified pharmaceutical agent may be a halogen compound solution.

Meanwhile, a dosing assembly is further arranged, the medicament output end of the dosing assembly is connected with the stirrer 31, and the medicament used for modifying the fly ash can be applied into the stirrer 31 through the dosing assembly, so that the medicament and the fly ash are mixed in the stirrer 31, and the modified fly ash is formed under the stirring action of the stirrer 31. The stirrer 31 can ensure the full contact and uniform mixing of the medicament and the fly ash so as to obtain the modified fly ash with better effect. Alternatively, the agitator 31 may be a wet agitator to more uniformly mix the agent with the fly ash.

In the present embodiment, a dryer 33 is provided downstream of the mixer 31 to dry the modified fly ash, and the modified fly ash after being mixed can be dried by the dryer 33.

In order to increase the adsorption capacity of the modified fly ash, it is necessary to increase the surface area of the modified fly ash, based on which the modified fly ash can be crushed to increase the surface area. In this way, the grinder 34 is provided downstream of the dryer 33, and the dried block-shaped modified fly ash can be ground and crushed by the grinder 34 to form a large amount of fresh surfaces, thereby improving the contact area and reaction capability of the modified fly ash and the exhaust gas, and further improving the adsorption effect of the modified fly ash on heavy metals such as mercury in the exhaust gas.

In order to collect the modified fly ash, a collection bin 71 is provided downstream of the grinding mill 34 in the embodiment of the present application, and the ground modified fly ash can be stored through the collection bin 71, so as to lay a foundation for the subsequent use of the modified fly ash.

In order to convey the modified fly ash into the flue 12, the injection assembly 81 is disposed downstream of the collection bin 71 in the embodiment of the present application, and the modified fly ash in the collection bin 71 can be injected into the flue 12 under the action of the injection assembly 81, so that the modified fly ash is scattered in the flue 12 to increase the adsorption area for heavy metals such as mercury, and further improve the adsorption effect.

Based on the above arrangement, the exhaust gas treatment system in the embodiment of the present application can collect the fly ash in the exhaust gas through the fly ash collection component, and convey the fly ash to the blender 31, and at the same time, apply the modified chemical into the blender 31, and under the stirring action of the blender 31, the fly ash and the chemical are mixed with each other, so as to form the modified fly ash; the modified fly ash is dried by the dryer 33 and ground by the grinder 34 to obtain more active surfaces, and the modified fly ash collected by the collection bin 71 is sprayed to the flue 12 through the spraying component 81, so that the modified fly ash can adsorb mercury in the tail gas, and the effect of removing mercury is achieved. Compared with the mode of activated carbon demercuration, in the application, the fly ash in the tail gas is collected and modified to obtain modified fly ash, so that the modified fly ash is used as an adsorbent to adsorb mercury in the tail gas, and the adsorbent is not required to be additionally added, thereby greatly reducing demercuration cost under the condition of ensuring demercuration effect and ensuring demercuration efficiency.

In some embodiments, the first ash conveying pipeline 22 includes an ash conveying main line 221, and a first ash conveying branch line 222 and a second ash conveying branch line 223 connected to the ash conveying main line 221, respectively, wherein the ash conveying main line 221 is connected to an output end of the electric dust collector 21, the first ash conveying branch line 222 is connected to the buffer bin 23, and the second ash conveying branch line 223 is connected to the ash storage 25. In this way, the fly ash collected by the electric dust collector 21 can be transported via the ash transporting main line 221, and then can be transported to the surge bin 23 via the first ash transporting branch line 222 for storage on the one hand, and can be transported to the ash storage 25 via the second ash transporting branch line 223 for storage on the other hand. It should be noted here that the fly ash stored in the surge bin 23 can be used for the subsequent mercury removal process, while the fly ash in the ash silo 25 can be stored or transported to other areas when a certain amount is reached.

In order to realize the switching process of transferring the fly ash to the surge bin 23 or the ash silo 25, in the embodiment of the present application, a first control valve body 224 is provided on the first ash transfer line 222, and a second control valve body 225 is provided on the second ash transfer line 223. Alternatively, the first control valve body 224 and the second control valve body 225 may both be connected to a control module of the exhaust gas treatment system, and the control module controls the respective opening or closing of the first control valve body 224 and the second control valve body 225, so as to realize the control of the ash conveying logic.

In order to control the ash conveying process more precisely, in the embodiment of the present application, a field bin pump 226 is disposed on the first ash conveying pipeline 22, an analog quantity level gauge is disposed on the field bin pump 226, and a third control valve 227 is disposed on the first ash conveying pipeline 22 downstream of the field bin pump 226, wherein the field bin pump 226, the analog quantity level gauge and the third control valve 227 are all electrically connected with a control module of the tail gas treatment system. Based on the above arrangement, the level of the E-field silo pump 226 can be selected according to the required quality of the fly ash, thereby forming an ash delivery control logic to meet the demand for fly ash.

Under the condition that the electric field bin pump 226 reaches the material level corresponding to the fly ash requirement, the first control valve body 224 is opened, the second control valve body 225 is closed, and the third control valve body 227 is opened, so that the fly ash at a certain material level in the electric field bin pump 226 can be conveyed to the buffer bin 23 to meet the actual requirement. In case that the fly ash collected in the surge bin 23 reaches a preset value, the first control valve 224 is closed, the second control valve 225 is opened, and the third control valve 227 is opened, so that the fly ash in the electric field bin pump 226 is transferred to the ash silo 25 to be stored in the ash silo 25.

In the embodiment of the application, the electric field ash conveying logic comprises an ash storehouse 25 conveying logic and a buffer bin 23 collecting logic, and the two logics are relatively independent. During the collection logic of the surge bin 23, when the electric field bin pump 226 reaches the material level corresponding to the fly ash demand, the third control valve 227 is opened, the second control valve 225 is closed, and the first control valve 224 is opened, at this time, under the pushing action of the compressed air in the first ash conveying pipeline 22, the fly ash is conveyed to the surge bin 23 through the first ash conveying branch line 222 for temporary storage. When the collecting logic operation of the surge bin 23 is completed, the third control valve 227 is opened, the second control valve 225 is opened, and the first control valve 224 is closed, at this time, under the pushing action of the compressed air in the first ash conveying pipeline 22, the fly ash is conveyed to the ash storage 25 through the second ash conveying branch line 223 for storage.

In the embodiment of the application, the electric field ash conveying is divided into two stages of ash loading and conveying, and the ash loading is carried out on the electric field bin pump 226 under the condition that the third control valve body 227 is closed, wherein the ash loading is generally controlled by time. After the ash is loaded, the third control valve 227 is opened, and then compressed gas is introduced in a delayed manner, so that the fly ash in the electric field bin pump 226 is conveyed to the ash bin 25 or the buffer bin 23.

It should be noted here that, in general, the required amount of the fly ash is much smaller than the generation amount of the electric field fly ash, and the buffer bin 23 and the electric dust collector 21 are arranged nearby, so that the transportation time of the fly ash is much shorter than the ash transportation period of the ash silo 25, the collection logic of the buffer bin 23 can be embedded into the transportation logic of the ash silo 25, and the original ash transportation control system can be used to modify the logic.

In some embodiments, multiple sets of electric precipitators 21 are provided in parallel on the flue 12. Alternatively, four sets of electric precipitators 21 may be provided, wherein each two sets share one induced draft fan 13 and are finally merged into the first ash conveying line 22. In this way, the fly ash collected by the plurality of sets of electric dust collectors 21 can be transported to the ash storage 25 or the surge bin 23 through the first ash transport pipeline 22.

In some embodiments, each electric dust collector 21 includes a plurality of electric field ash buckets 211 sequentially arranged along the flow direction of the exhaust gas, and an electric field silo pump 226 is correspondingly arranged downstream of each electric field ash bucket 211. Thus, in the collecting and logic proceeding process of the surge bin 23, when the electric field bin pumps 226 reach the material level corresponding to the fly ash requirement, the reasonable number of the electric field bin pumps 226 can be selected.

In addition, a part of the plurality of electric field ash hoppers 211 is connected to the first ash conveying pipeline 22, another part of the plurality of electric field ash hoppers 211 is connected to the second ash conveying pipeline 24, and the second ash conveying pipeline 24 is connected to the ash silo 25. Alternatively, each electric dust collector 21 may include three electric field ash hoppers 211, wherein one electric field ash hopper 211 is separately provided with one pipeline, that is, the electric field ash hopper 211 is connected with the first ash conveying pipeline 22, and the other two electric field ash hoppers 211 are connected with the second ash conveying pipeline 24, so that the collected fly ash can be directly conveyed to the ash silo 25 for storage.

In order to accurately control the supply amount of the fly ash, the weighing screw conveyor 32 is provided between the surge bin 23 and the agitator 31, and the weighing screw conveyor 32 is used for conveying a fixed amount of fly ash from the surge bin 23 to the agitator 31. Optionally, the weighing screw conveyor 32 employs variable frequency regulation so that the flow rate of the fly ash can be controlled.

Further, a rotary feeder is arranged between the buffer bin 23 and the weighing screw conveyor 32, and the adjustment of the conveying fly ash amount of the subsequent weighing screw conveyor 32 can be ensured to be more accurate through the rotary feeder.

In addition to this, a level indicator can also be provided at the surge bin 23 to detect the level in the surge bin 23.

In some embodiments, the drug adding assembly comprises a drug tank 41 and a drug adding pump 42, wherein the drug tank 41 is used for containing the modified drug, the drug tank 41 is connected with the blender 31, the drug adding pump 42 is arranged between the drug tank 41 and the blender 31, and the drug can be conveyed from the drug tank 41 to the blender 31 through the drug adding pump 42. Based on the above arrangement, the modified chemical can be mixed with the fly ash in the stirrer 31 and uniformly stirred by the stirrer 31, thereby ensuring sufficient contact and uniform mixing of the chemical and the fly ash. Alternatively, the dosing pump 42 is controlled by variable frequency, and the amount of the dosing agent can be adjusted according to the amount of the fly ash.

In some embodiments, dryer 33 is a spin flash dryer that includes a screw conveyor station for conveying and breaking up the modified fly ash output from blender 31 and a drying station for drying the modified fly ash output from the screw conveyor station. The specific process is that the liquid-containing fly ash discharged from the stirrer 31 automatically flows into the spin flash dryer, the agglomerated modified fly ash in the stirrer 31 is scattered by the spiral conveying station of the spin flash dryer, and is sent to the drying station together with other ash particles. The tail gas of the outlet of the induced draft fan 13 of the boiler 11 can be introduced into the lower part of the dryer 33 in the embodiment of the application, the evaporation of water in the liquid-containing ash particles is completed by utilizing the waste heat of the tail gas, and then the tail gas is simultaneously used as a conveying medium to convey the modified fly ash particles in the dryer 33 to the grinder 34.

In some embodiments, a first pipeline 61 for returning the tail gas is connected between the surge bin 23 and the flue 12, and a first tail gas regulating valve 62 is arranged on the second pipeline 63. In the embodiment of the present application, the compressed gas for transporting the fly ash enters the surge bin 23 for diffusion, and the part of the gas can be transported to the flue 12 by the first duct 61 due to the dust contained in the part of the gas. Optionally, the tail gas containing dust is conveyed to the inlet of the electric dust collector 21 through the first pipeline 61, and the electric dust collector 21 is used for purification treatment, so that an exhaust purification system is not required to be separately arranged for the buffer bin 23, the system is simplified, and the investment and the operating cost are reduced. The first tail gas regulating valve 62 can regulate according to a pressure gauge arranged on the buffer bin 23 to ensure that the tail gas containing dust is discharged from the buffer bin 23. In addition, an exhaust shutoff valve can be arranged on the first pipeline 61, and the exhaust shutoff valve can switch the on-off of the first pipeline 61 to meet the actual requirement.

Based on the above arrangement, the pressure in the buffer bin 23 can be ensured not to be too large, the tail gas containing dust can not be directly discharged, and a purification system does not need to be arranged independently, so that the system is simplified under the condition of meeting the actual requirement of the system, and the cost is reduced.

In some embodiments, a cyclone 51 is disposed between the grinding mill 34 and the collecting bin 71, a second pipeline 63 for returning the tail gas is connected between the cyclone 51 and the flue 12, and a second tail gas regulating valve 64 is disposed on the second pipeline 63.

Further, a bag-type dust collector 52 is arranged on the second pipeline 63, and the bag-type dust collector 52 is connected with the cyclone separator 51 and the collection bin 71 respectively.

In the embodiment of the present application, in order to separate the modified fly ash, a modified fly ash separation device is disposed downstream of the collection bin 71, wherein the modified fly ash separation device includes a cyclone 51, a bag-type dust collector 52 and a tail gas blower. The modified fly ash collected by the cyclone 51 and the bag-type dust collector 52 is stored in the collection bin 71. The separation process is in a negative pressure operation state, and dust leakage can be effectively avoided in the negative pressure operation state. The power is provided by a tail gas fan. Tail gas fan exhaust tail gas will be sent to electrostatic precipitator 21's entrance, and tail gas can return the system on the one hand and carry out purification treatment, and on the other hand can also make full use of draught fan 13's export and electrostatic precipitator 21's entry tail gas's differential pressure, has reduced the pressure head of tail gas fan, has reduced system cost and operation power consumption.

In some embodiments, an electric airlock is provided downstream of the cyclone 51 and bag-type dust collector 52, respectively, to prevent air leakage from the collection bin 71. In order to ensure the normal operation of the tail gas fan and prevent the tail gas fan from leaking air into the inlet of the electric dust collector 21 when the tail gas fan is stopped, the cash card of the tail gas fan is provided with an isolating valve.

In summary, in the embodiment of the present application, the fly ash (coarse ash) collected by the electric dust collector 21 is used as the adsorbent, and a suitable modifying agent (e.g., a halogen compound solution, etc.) is used for mixing and drying to achieve sufficient contact between the modifying agent and the fly ash particles, and the modified fly ash is ground and crushed by the sufficient grinding machine 34 to keep sufficient activity of the modified fly ash, and is conveyed into the flue 12 or other suitable positions by the injection assembly 81 to adsorb mercury in the tail gas, and is finally captured by the dust collector to achieve the effect of removing mercury.

The tail gas treatment system that this application embodiment provided has following advantage:

the modified fly ash is derived from fly ash in tail gas, is formed by applying a modifying agent and is taken as an absorbent, so that the modified fly ash is available and low in price.

The first ash conveying pipeline 22 is used for conveying the modified fly ash, and the quantity and the material level of the electric field bin pump 226 can be flexibly arranged to feed the buffer bin 23 according to the required quantity of the modified fly ash. The surge bin 23 logic can be embedded in the ash silo 25 logic without adversely affecting ash transport and without adding additional systems for transporting compressed gas.

Set up first pipeline 61 at surge bin 23, set up second pipeline 63 at collection storehouse 71 to make surge bin 23 and collection storehouse 71 communicate respectively to electrostatic precipitator 21's entry, utilize the electrostatic precipitator 21 of unit to replace surge bin 23 or collection storehouse 71 etc. and do not set up exhaust purification system, simplified the system and reduced engineering cost.

The fly ash adopts a weighing and quantitative feeding mode, and the adding amount of the modifying agent can be accurately controlled.

The fly ash and the modified medicament are fully mixed, and the blockage in the conveying process can be prevented by a mechanical stirring mode.

The tail gas waste heat is utilized to realize the recycling of the heat source, the drying and the mechanical force crushing of the agglomerated materials can be realized, and the system blockage caused by the agglomeration due to humidification is avoided.

The modified fly ash obtains more active surface by adopting the grinder 34, and the reactivity of the modified fly ash is improved.

The negative pressure gas-solid separation device is adopted, so that ash leakage is prevented, the higher material receiving efficiency is ensured, and the utilization rate of the modified reagent is improved.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An exhaust gas treatment system, comprising:

the fly ash collecting assembly comprises an electric dust collector (21), a first ash conveying pipeline (22) and a buffering bin (23), wherein the electric dust collector (21) is arranged on a flue (12) for outputting tail gas, and the electric dust collector (21) is connected with the buffering bin (23) through the first ash conveying pipeline (22);

the stirrer (31) is arranged at the downstream of the buffer bin (23) and used for receiving the fly ash conveyed by the buffer bin (23);

the agent output end of the agent adding component is connected with the stirrer (31) and is used for applying an agent for modifying the fly ash into the stirrer (31) so as to mix the agent and the fly ash in the stirrer (31) to form modified fly ash;

a dryer (33), wherein the dryer (33) is disposed downstream of the mixer (31) to dry the modified fly ash;

a grinder (34), said grinder (34) being arranged downstream of said dryer (33) to grind said modified fly ash;

a collection silo (71), said collection silo (71) being arranged downstream of said mill (34) for storing the pulverized modified fly ash;

an injection assembly (81), said injection assembly (81) being disposed downstream of said collection bin (71) to inject said modified fly ash within said collection bin (71) into said flue (12).

2. The tail gas treatment system of claim 1, wherein the first ash conveying pipeline (22) comprises an ash conveying main line (221) and a first ash conveying branch line (222) and a second ash conveying branch line (223) which are respectively connected with the ash conveying main line (221), the ash conveying main line (221) is connected with the electric dust remover (21), the first ash conveying branch line (222) is connected with the buffer bin (23), and the second ash conveying branch line (223) is used for being connected with an ash storage (25);

the first ash conveying branch line (222) is provided with a first control valve body (224), and the second ash conveying branch line (223) is provided with a second control valve body (225).

3. The exhaust gas treatment system according to claim 2, wherein the first ash conveying line (22) is provided with a field silo pump (226) and a third control valve body (227), the field silo pump (226) being provided with an analog quantity level gauge for measuring a level in the field silo pump (226);

when the material level corresponding to the fly ash demand is reached in the E-field bin pump (226), the first control valve body (224) is opened, the second control valve body (225) is closed, and the third control valve body (227) is opened, so that the fly ash in the E-field bin pump (226) is conveyed to the buffer bin (23);

and when the fly ash collected by the surge bin (23) reaches a preset value, the first control valve body (224) is closed, the second control valve body (225) is opened, and the third control valve body (227) is opened, so that the fly ash in the electric field bin pump (226) is conveyed to the ash bin (25).

4. The tail gas treatment system according to claim 3, wherein a plurality of groups of electric dust collectors (21) arranged in parallel are arranged on the flue (12);

and/or, electrostatic precipitator (21) include a plurality of electric field ash buckets (211) that set gradually along tail gas flow direction, every the low reaches of electric field ash bucket (211) correspond to be equipped with electric field warehouse pump (226), it is a plurality of partly in electric field ash bucket (211) with first defeated grey pipeline (22) are connected, and are a plurality of another part in electric field ash bucket (211) are connected with second defeated grey pipeline (24), second defeated grey pipeline (24) with ash storehouse (25) are connected.

5. The exhaust gas treatment system according to claim 1, wherein a weighing screw conveyor (32) is arranged between the surge bin (23) and the agitator (31), the weighing screw conveyor (32) being adapted to convey a metered amount of fly ash from the surge bin (23) to the agitator (31).

6. The exhaust treatment system of claim 1, wherein the dosing assembly includes a chemical tank (41) and a dosing pump (42), the chemical tank (41) being connected to the blender (31), the dosing pump (42) being disposed between the chemical tank (41) and the blender (31) to deliver chemicals from the chemical tank (41) to the blender (31).

7. The exhaust gas treatment system according to claim 1, wherein the dryer (33) is a spin flash dryer comprising a screw conveyor station for conveying and scattering the modified fly ash output from the blender (31) and a drying station for drying the modified fly ash output from the screw conveyor station.

8. The exhaust gas treatment system according to claim 1 or 3, wherein a first pipeline (61) for returning exhaust gas is connected between the surge bin (23) and the flue (12), and a first exhaust gas regulating valve (62) is arranged on the first pipeline (61).

9. The tail gas treatment system according to claim 1, characterized in that a cyclone separator (51) is arranged between the grinding mill (34) and the collection bin (71), a second pipeline (63) for returning tail gas is connected between the cyclone separator (51) and the flue (12), and a tail gas fan and a second tail gas regulating valve (64) are arranged on the second pipeline (63).

10. The tail gas treatment system according to claim 9, wherein a bag-type dust collector (52) is arranged on the second pipeline (63), the bag-type dust collector (52) is connected with the cyclone separator (51), and the bag-type dust collector (52) is connected with the collection bin (71).

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