A fly ash internal circulation treatment system and method

Abstract

The invention relates to the technical field of incineration fly ash treatment, and discloses a fly ash internal circulation treatment system and method. The fly ash internal circulation treatment system is used to treat the fly ash in an internal circulation manner, and the method comprises the following steps: flue gas purification treatment, flue gas filtration treatment, fly ash storage treatment and fly ash circulation treatment. The invention utilizes the unreacted fly ash at the bottom of a rotary spray deacidification reaction tower to carry out a secondary reaction, and pneumatically conveys the fly ash to the horizontal flue of the rotary spray deacidification reaction tower to react with acidic gas in the flue gas, thereby reducing pollutant emissions. The coordinated use of the ash storage system and the internal circulation system can reduce the pollution risk of fly ash to the environment and reduce the emission concentration of pollutants during the incineration process. On the other hand, the fly ash treatment cost is reduced, the auxiliary material consumption is reduced, the operating efficiency of the incinerator is improved, and the power generation is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of fly ash treatment from the incineration of domestic waste, and in particular to a fly ash internal circulation treatment system and method. Background Art

[0002] Incineration of domestic waste is the use of high-temperature oxidation to treat domestic waste - burning domestic waste at high temperatures to convert combustible waste in domestic waste into carbon dioxide and water, etc. The ash and slag after incineration is only less than 20% of the original volume of domestic waste, thereby greatly reducing the amount of solid waste and completely eliminating various pathogens.

[0003] Fly ash is small particles captured and settled during the flue gas purification process of municipal solid waste incineration.

[0004] Among them, fly ash mainly comes from dust particles collected by bag filters and fly ash at the bottom of the desulfurization tower after reaction. The main components are CaO, SiO2, K2O, Al2O3, NaCl, SO3 and heavy metals. The unreacted CaO content is 23.39% to 74.11%. Many of the CaO that did not participate in the reaction in the desulfurization tower are directly outsourced as hazardous waste fly ash, which not only increases the cost of fly ash disposal, but also increases the consumption of auxiliary materials.

[0005] To this end, a fly ash internal circulation disposal system and method are proposed. Summary of the invention

[0006] The technical task of the present invention is to provide a fly ash internal circulation disposal system and method for solving the above-mentioned problems in view of the above-mentioned deficiencies.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A fly ash internal circulation disposal system, comprising:

[0009] A purification system, which is used to purify the flue gas generated by the incinerator;

[0010] A filtration system, which is used to filter and discharge the flue gas purified by the purification system;

[0011] Ash storage system, which is used to uniformly collect and process fly ash after being processed by the purification system and the filtration system;

[0012] An internal circulation system, which is used to transport the fly ash in the ash storage system to the bottom of the purification system for secondary chemical reaction;

[0013] Among them, the purification system is connected with the filtering system, and the purification system and the filtering system are both connected with the ash storage system, and the purification system and the ash storage system are both connected with the internal circulation system.

[0014] Furthermore, the purification system includes a rotary spray deacidification reaction tower, a water tank, a slaked lime silo, a slaked lime slurry preparation tank and a slaked lime slurry storage tank. The smoke inlet of the rotary spray deacidification reaction tower is connected to the flue of the waste heat boiler, the water outlet of the water tank is connected to the atomizer of the rotary spray deacidification reaction tower, the feed inlet of the slaked lime slurry preparation tank is connected to the discharge port of the slaked lime silo, the discharge port of the slaked lime slurry preparation tank is connected to the feed inlet of the slaked lime slurry storage tank, the discharge port of the slaked lime slurry storage tank is connected to the atomizer of the rotary spray deacidification reaction tower, and the rotary spray deacidification reaction tower is connected to the filtration system.

[0015] Furthermore, the filtration system includes a bag filter, an activated carbon silo, an induced draft fan and a chimney; the air outlet of the rotary spray deacidification reaction tower, the discharge port of the activated carbon silo and the slaked lime silo are all connected to the air inlet of the bag filter, the air outlet of the bag filter is connected to the air inlet end of the induced draft fan, the exhaust end of the induced draft fan is connected to the air inlet of the chimney, and the rotary spray deacidification reaction tower and the bag filter are both connected to the ash storage system;

[0016] The ash storage system includes a fly ash bin, a star-shaped feeder and an electric three-way valve. The ash discharge ports of the rotary spray deacidification reaction tower and the bag filter are connected to the feed port of the fly ash bin through a screw conveyor. The ash discharge port of the fly ash bin is connected to the A port of the electric three-way valve through the star-shaped feeder, and the B port of the electric three-way valve is connected to the internal circulation system.

[0017] Furthermore, the internal circulation system includes a Roots blower, an air heater, a seamless steel pipe and a reducer, the air outlet end of the Roots blower is connected to the air inlet end of the seamless steel pipe, the air outlet end of the seamless steel pipe is connected to the smoke outlet pipe of the economizer, and the two ends of the reducer are respectively connected to the B port of the electric three-way valve and the seamless steel pipe.

[0018] Furthermore, the large diameter port of the reducer is communicated with the B port of the electric three-way valve, and the small diameter port of the reducer is communicated with the seamless steel pipe.

[0019] Furthermore, a metal expansion joint is installed on the seamless steel pipe, and the metal expansion joint is located between the air heater and the reducer.

[0020] Furthermore, a pressure gauge and a thermometer are installed on the seamless steel pipe, and both the pressure gauge and the thermometer are located between the metal expansion joint and the reducer.

[0021] Furthermore, one end of the seamless steel pipe away from the air heater is connected to a nozzle, one end of the nozzle away from the air heater is connected to a sleeve, and one end of the sleeve away from the nozzle is fixedly penetrated into the inner cavity of the economizer smoke outlet pipe.

[0022] Furthermore, the surfaces of the air heater, seamless steel pipe and reducer are all fixedly covered with a ceramic fiber blanket, the thickness of the ceramic fiber blanket is 50 mm, and the specific gravity of the fly ash transported in the seamless steel pipe is .

[0023] The present invention also provides a fly ash internal circulation treatment method, which uses the fly ash internal circulation treatment system described above to perform internal circulation treatment on fly ash, and specifically comprises the following steps:

[0024] S1, flue gas purification treatment: start the induced draft fan, the induced draft fan introduces the flue gas into the purification system and the filtration system in sequence to meet the flue gas purification and filtration requirements, so that the flue gas of the incinerator enters the inner cavity of the rotary spray deacidification reaction tower through the flue of the waste heat boiler, and the slaked lime is quantitatively transported to the inner cavity of the slaked lime slurry preparation tank through the slaked lime bin, and then water is quantitatively added to the inner cavity of the slaked lime slurry preparation tank, and the slaked lime and water are uniformly stirred by the slaked lime slurry preparation tank to obtain a slaked lime slurry with a concentration of 20%, and the slaked lime slurry is transported to the slaked lime slurry storage tank for storage, and the slaked lime slurry storage tank quantitatively transports the slaked lime slurry to the rotary spray deacidification reaction tower, the slurry is atomized into droplets by the atomizer, and contacts with the flue gas in the rotary spray deacidification reaction tower to produce a chemical reaction, and the cooling water is atomized into droplets by the atomizer through the water tank to reduce the temperature in the rotary spray deacidification reaction tower, that is, the flue gas purification operation is achieved;

[0025] S2. Flue gas filtration treatment: The dust bags in the bag filter can be pre-coated with lime through the slaked lime bin, which is used to protect the dust bags from being stuck or corroded when filtering a large amount of oil fume pollution and other corrosive gases or particulates, which helps to extend the service life of the dust bags; the purified flue gas is discharged to the inner cavity of the bag filter through the outlet of the rotary spray deacidification reaction tower, and activated carbon is added to the bag filter through the activated carbon bin to capture and remove dust particles in the flue gas, which can achieve separation of flue gas and dust. The flue gas can be filtered through the bag filter, and the dust particles in the flue gas are captured on the dust bag. Finally, the filtered flue gas is discharged through the chimney, that is, the filtering operation of the flue gas is achieved;

[0026] S3, fly ash storage and treatment: The ash outlets of the rotary spray deacidification reaction tower and the bag filter are respectively transported to the inner cavity of the fly ash bin through screw conveyors for unified storage, thus realizing the storage operation of fly ash;

[0027] S4, fly ash internal circulation treatment: The B port of the electric three-way valve quantitatively transports the fly ash to the inner cavity of the seamless steel pipe, starts the Roots blower and the air heater, and the air heater heats the air. The Roots blower transports the heated air to the inner cavity of the seamless steel pipe, so that the fly ash in the seamless steel pipe is transported to the inner cavity of the nozzle through the seamless steel pipe, and is sprayed into the economizer smoke outlet pipe by the nozzle, so that the fly ash is transported to the horizontal flue of the rotary spray deacidification reaction tower at the dry slaked lime injection port through the economizer smoke outlet pipe, and the unreacted slaked lime at the bottom of the rotary spray deacidification reaction tower is used. , and continue to undergo secondary chemical reactions with the acidic gases in the flue gas in the horizontal flue, thereby reducing the concentration of pollutant emissions and saving dry slaked lime, that is, realizing the internal circulation operation of fly ash.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are:

[0029] 1. The present invention uses the ash storage system and the internal circulation system to utilize the rotary spray to remove the unreacted ash at the bottom of the reaction tower. Carry out secondary reaction, pneumatically transport fly ash to the horizontal flue of the rotary spray deacidification reaction tower, react with acidic gas in the flue gas, and reduce pollutant emissions;

[0030] 2. The present invention, through the coordinated use of the ash storage system and the internal circulation system, can reduce the pollution risk of fly ash to the environment and reduce the emission concentration of pollutants during the incineration process on the one hand; on the other hand, it can reduce the fly ash disposal cost, reduce the consumption of auxiliary materials, improve the operating efficiency of the incinerator, and increase the power generation; on the other hand, it can promote the sustainable development of the waste incineration industry and provide new ideas and technical demonstrations for fly ash disposal. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of a fly ash internal circulation disposal system according to an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a purification system of a fly ash internal circulation disposal system according to an embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of a filtration system of a fly ash internal circulation disposal system according to an embodiment of the present invention;

[0035] Figure 4It is a structural schematic diagram of an ash storage system and an internal circulation system of a fly ash internal circulation disposal system according to an embodiment of the present invention;

[0036] Figure 5 The structure diagram of the ash storage system and the internal circulation system of the fly ash internal circulation disposal system according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0037] Figure 6 The structure diagram of the ash storage system and the internal circulation system of the fly ash internal circulation disposal system according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0038] Figure 7 The structure diagram of the ash storage system, internal circulation system and economizer smoke outlet pipe of the fly ash internal circulation disposal system of the embodiment of the present invention is shown in FIG. Figure 3 ;

[0039] Figure 8 It is a schematic diagram of the structure of the casing and economizer smoke outlet pipe of the fly ash internal circulation treatment system according to an embodiment of the present invention;

[0040] Fig. 9 The fly ash internal circulation treatment system of the embodiment of the present invention Figure 8 A schematic diagram of the enlarged structure of point A;

[0041] Fig.10 The present invention is a flowchart of a method for internal circulation of fly ash according to an embodiment of the present invention.

[0042] In the figure: 100, purification system; 110, rotary spray deacidification reaction tower; 120, water tank; 130, slaked lime warehouse; 140, slaked lime slurry preparation tank; 150, slaked lime slurry storage tank;

[0043] 200, filtration system; 210, bag filter; 220, activated carbon silo; 230, induced draft fan; 240, chimney; 241, gas analyzer;

[0044] 300, ash storage system; 310, fly ash bin; 320, star-shaped feeder; 330, electric three-way valve;

[0045] 500. Internal circulation system; 510. Roots blower; 520. Air heater; 530. Seamless steel pipe; 540. Reducer; 550. Metal expansion joint; 560. Pressure gauge; 570. Thermometer; 580. Nozzle; 590. Casing. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] like Figure 1-Figure 9 As shown, a fly ash internal circulation disposal system according to an embodiment of the present invention includes: a purification system 100, a filtering system 200, an ash storage system 300 and an internal circulation system 500;

[0050] Wherein, the purification system 100 is used to purify the flue gas generated by the incinerator;

[0051] The filtering system 200 is used to filter and discharge the flue gas purified by the purification system 100;

[0052] The ash storage system 300 is used to uniformly collect and process the fly ash processed by the purification system 100 and the filtration system 200;

[0053] The internal circulation system 500 is used to transport the fly ash in the ash storage system 300 to the bottom of the purification system 100 for secondary chemical reaction;

[0054] The purification system 100 is in communication with the filtering system 200 , and both the purification system 100 and the filtering system 200 are in communication with the ash storage system 300 , and both the purification system 100 and the ash storage system 300 are in communication with the internal circulation system 500 .

[0055] Example 2

[0056] like Figure 1-Figure 9 As shown, the fly ash internal circulation disposal system provided in this embodiment is different from that in embodiment 1 in that:

[0057] The purification system 100 includes a rotary spray deacidification reaction tower 110, a water tank 120, a slaked lime bin 130, a slaked lime slurry preparation tank 140 and a slaked lime slurry storage tank 150. The smoke inlet of the rotary spray deacidification reaction tower 110 is connected to the flue of the waste heat boiler, the water outlet of the water tank 120 is connected to the atomizer of the rotary spray deacidification reaction tower 110, the feed inlet of the slaked lime slurry preparation tank 140 is connected to the discharge outlet of the slaked lime bin 130, the discharge outlet of the slaked lime slurry preparation tank 140 is connected to the feed inlet of the slaked lime slurry storage tank 150, and the discharge outlet of the slaked lime slurry storage tank 150 is connected to the rotary spray deacidification reaction tower 110. The atomizer of the acid reaction tower 110 is connected, and the rotary spray deacidification reaction tower 110 is connected to the filtering system 200. Through the coordinated use of the slaked lime bin 130, the slaked lime slurry preparation tank 140 and the slaked lime slurry storage tank 150, a slaked lime slurry with a concentration of 13-20% can be prepared and quantitatively fed into the rotary spray deacidification reaction tower 110. The slurry is atomized into droplets through the atomizer, and contacts with the flue gas in the rotary spray deacidification reaction tower 110 to produce a chemical reaction; the slurry can be atomized into droplets through the atomizer through the water tank 120, thereby reducing the temperature in the rotary spray deacidification reaction tower 110, which helps to improve and reaction efficiency.

[0058] The filtration system 200 includes a bag filter 210, an activated carbon bin 220, an induced draft fan 230, and a chimney 240. The air outlet of the rotary spray deacidification reaction tower 110, the activated carbon bin 220, and the discharge port of the slaked lime bin 130 are all connected to the air inlet of the bag filter 210. The air outlet of the bag filter 210 is connected to the air inlet end of the induced draft fan 230. The exhaust end of the induced draft fan 230 is connected to the air inlet of the chimney 240. The rotary spray deacidification reaction tower 110 and the bag filter 210 are both connected to the ash storage system 300. The activated carbon bin 220 can be used to add activated carbon to the bag filter 210. The charcoal is used to capture and remove dust particles in the gas, and can separate the gas from the dust. The slaked lime bin 130 can be used to pre-coat the dust bags in the bag filter 210, and is used to protect the dust bags from being stuck or corroded when filtering gases or particulates containing a large amount of oil smoke pollution and other corrosive gases or particulates, which helps to extend the service life of the dust bags. The induced draft fan 230 can achieve the induced draft effect, and the flue gas can be introduced into the purification system 100 and the filtration system 200 in turn to meet the purification and filtration needs of the flue gas. A gas analyzer 241 for measuring gas composition is installed in the chimney 240.

[0059] The ash storage system 300 includes a fly ash bin 310, a star-shaped feeder 320 and an electric three-way valve 330. The ash discharge ports of the rotary spray deacidification reaction tower 110 and the bag filter 210 are connected to the feed port of the fly ash bin 310 through a screw conveyor. The ash discharge port of the fly ash bin 310 is connected to the A port of the electric three-way valve 330 through the star-shaped feeder 320. The B port of the electric three-way valve 330 is connected to the internal circulation system 500. The fly ash in the flue gas can be received and stored through the fly ash bin 310. The fly ash in the fly ash bin 310 can be evenly and continuously fed into the internal circulation system 500 through the star-shaped feeder 320 and the electric three-way valve 330.

[0060] The internal circulation system 500 includes a Roots blower 510, an air heater 520, a seamless steel pipe 530 and a reducer 540. The air outlet of the Roots blower 510 is connected to the air inlet of the seamless steel pipe 530, the air outlet of the seamless steel pipe 530 is connected to the smoke outlet pipe of the economizer, and the two ends of the reducer 540 are respectively connected to the B port of the electric three-way valve 330 and the seamless steel pipe 530. The fly ash can be transported to the horizontal flue of the rotary spray deacidification reaction tower 110 at the dry slaked lime injection port by pneumatic conveying through the internal circulation system 500, and the unreacted ash at the bottom of the rotary spray deacidification reaction tower 110 can be transported to the dry slaked lime injection port by pneumatic conveying. , continue to follow the acidic gas in the flue gas at the horizontal flue ( and The fly ash transported in the seamless steel pipe 530 has a specific gravity of ; The large diameter port of the reducer 540 is connected to the B port of the electric three-way valve 330, and the small diameter port of the reducer 540 is connected to the seamless steel pipe 530; a metal expansion joint 550 is installed on the seamless steel pipe 530, and the metal expansion joint 550 is located between the air heater 520 and the reducer 540. The metal expansion joint 550 can compensate for the seamless steel pipe 530 and absorb the thermal displacement generated by the gas passing through the seamless steel pipe 530; a pressure gauge 560 and a thermometer 570 are also installed on the seamless steel pipe 530, and the pressure gauge 560 and the thermometer 570 are both located between the metal expansion joint 550 and the reducer 540. The metal expansion joint 550, the pressure gauge 560 and the thermometer 570 are sequentially arranged along the gas delivery direction, and the pressure gauge 560 and the thermometer 570 are used to adjust the pressure of the seamless steel pipe 530. When used together, the pressure and temperature of the gas in the seamless steel pipe 530 can be monitored in real time; the end of the seamless steel pipe 530 away from the air heater 520 is connected to the nozzle 580, and the end of the nozzle 580 away from the air heater 520 is connected to the sleeve 590, and the end of the sleeve 590 away from the nozzle 580 is fixedly penetrated into the inner cavity of the economizer smoke outlet pipe, and the gas can be sprayed into the economizer smoke outlet pipe through the nozzle 580, and the connection operation between the nozzle 580 and the economizer smoke outlet pipe can be achieved through the sleeve 590; the surfaces of the air heater 520, the seamless steel pipe 530 and the reducer 540 are fixedly covered with a ceramic fiber blanket, the thickness of the ceramic fiber blanket is 50 mm, and the ceramic fiber blanket can play a role of heat insulation for the air heater 520, the seamless steel pipe 530 and the reducer 540.

[0061] Example 3

[0062] like Fig.10 As shown, the present embodiment provides a fly ash internal circulation treatment method, which uses the fly ash internal circulation treatment system described above to perform internal circulation treatment on fly ash, and specifically includes the following steps:

[0063] S1. Flue gas purification treatment: Start the induced draft fan 230, which introduces the flue gas into the purification system 100 and the filtration system 200 in sequence to meet the flue gas purification and filtration requirements, so that the flue gas from the incinerator enters the inner cavity of the rotary spray deacidification reaction tower 110 through the flue of the waste heat boiler, and the slaked lime is quantitatively transported to the inner cavity of the slaked lime slurry preparation tank 140 through the slaked lime bin 130, and then water is quantitatively added to the inner cavity of the slaked lime slurry preparation tank 140, and the slaked lime and water are uniformly mixed through the slaked lime slurry preparation tank 140. The slaked lime slurry is uniformly prepared to obtain a slaked lime slurry with a concentration of 13-20%, and the slaked lime slurry is transported to the slaked lime slurry storage tank 150 for storage. The slaked lime slurry storage tank 150 quantitatively transports the slaked lime slurry to the rotary spray deacidification reaction tower 110, and the slurry is atomized into droplets by an atomizer, and contacts with the flue gas in the rotary spray deacidification reaction tower 110 to produce a chemical reaction. The cooling water is atomized into droplets by the atomizer through the water tank 120 to reduce the temperature in the rotary spray deacidification reaction tower 110, that is, the flue gas purification operation is achieved;

[0064] S2, flue gas filtration treatment: The dust bags in the bag filter 210 can be pre-coated with lime through the slaked lime bin 130, which is used to protect the dust bags from being stuck or corroded when filtering a large amount of oil fume pollution and other corrosive gases or particulates, which helps to extend the service life of the dust bags; the purified flue gas is discharged to the inner cavity of the bag filter 210 through the air outlet of the rotary spray deacidification reaction tower 110, and activated carbon is added to the bag filter 210 through the activated carbon bin 220 to capture and remove dust particles in the flue gas, so as to achieve separation of flue gas and dust. The bag filter 210 can filter the flue gas, and the dust particles in the flue gas are captured on the dust bags. Finally, the filtered flue gas is discharged through the chimney 240, that is, the filtering operation of the flue gas is achieved;

[0065] S3, fly ash storage and processing: the ash outlets of the rotary spray deacidification reaction tower 110 and the bag filter 210 respectively transport the fly ash to the inner cavity of the fly ash bin 310 through a screw conveyor for unified storage, thereby realizing the storage operation of the fly ash;

[0066] S4, fly ash internal circulation treatment (i.e., secondary chemical reaction treatment): the B port of the electric three-way valve 330 quantitatively transports the fly ash to the inner cavity of the seamless steel pipe 530, starts the Roots blower 510 and the air heater 520, and the air heater 520 heats the air. The Roots blower 510 transports the heated air to the inner cavity of the seamless steel pipe 530, so that the fly ash in the seamless steel pipe 530 is transported to the inner cavity of the nozzle 580 through the seamless steel pipe 530, and is sprayed into the economizer smoke outlet pipe by the nozzle 580, so that the fly ash is transported to the horizontal flue of the rotary spray deacidification reaction tower 110 at the dry slaked lime injection port through the economizer smoke outlet pipe, and the unreacted at the bottom of the rotary spray deacidification reaction tower 110 is used. , and continue to undergo secondary chemical reactions with the acidic gases in the flue gas in the horizontal flue, thereby reducing the concentration of pollutant emissions and saving dry slaked lime, that is, realizing the internal circulation operation of fly ash.

[0067] Through the above specific implementations, those skilled in the art can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementations. On the basis of the disclosed implementations, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions.

Claims

1. A fly ash internal circulation disposal system, characterized in that: include: A purification system (100) for purifying flue gas generated by an incinerator; A filtering system (200) for filtering and discharging the flue gas purified by the purification system (100); An ash storage system (300) is used to uniformly collect and process fly ash processed by the purification system (100) and the filtration system (200); An internal circulation system (500) is used to transport the fly ash in the ash storage system (300) to the bottom of the purification system (100) for secondary chemical reaction; The purification system (100) is in communication with the filtering system (200), the purification system (100) and the filtering system (200) are both in communication with the ash storage system (300), and the purification system (100) and the ash storage system (300) are both in communication with the internal circulation system (500); The purification system (100) comprises a rotary spray deacidification reaction tower (110), a water tank (120), a slaked lime bin (130), a slaked lime slurry preparation tank (140), and a slaked lime slurry storage tank (150); the smoke inlet of the rotary spray deacidification reaction tower (110) is in communication with the flue of a waste heat boiler; the water outlet of the water tank (120) is in communication with the atomizer of the rotary spray deacidification reaction tower (110); the feed inlet of the slaked lime slurry preparation tank (140) is in communication with the discharge outlet of the slaked lime bin (130); the discharge outlet of the slaked lime slurry preparation tank (140) is in communication with the feed inlet of the slaked lime slurry storage tank (150); the discharge outlet of the slaked lime slurry storage tank (150) is in communication with the atomizer of the rotary spray deacidification reaction tower (110); and the rotary spray deacidification reaction tower (110) is in communication with a filtration system (200); The filtering system (200) comprises a bag filter (210), an activated carbon silo (220), an induced draft fan (230) and a chimney (240); the air outlet of the rotary spray deacidification reaction tower (110), the material outlet of the activated carbon silo (220) and the slaked lime silo (130) are all in communication with the air inlet of the bag filter (210); the air outlet of the bag filter (210) is in communication with the air inlet end of the induced draft fan (230); the exhaust end of the induced draft fan (230) is in communication with the air inlet of the chimney (240); and the rotary spray deacidification reaction tower (110) and the bag filter (210) are both in communication with the ash storage system (300); The ash storage system (300) comprises a fly ash bin (310), a star-shaped feeder (320), and an electric three-way valve (330); the ash discharge ports of the rotary spray deacidification reaction tower (110) and the bag filter (210) are both connected to the feed port of the fly ash bin (310) via a screw conveyor; the ash discharge port of the fly ash bin (310) is connected to the A port of the electric three-way valve (330) via the star-shaped feeder (320); and the B port of the electric three-way valve (330) is connected to the internal circulation system (500); The internal circulation system (500) comprises a Roots blower (510), an air heater (520), a seamless steel pipe (530) and a reducer (540); the air outlet end of the Roots blower (510) is connected to the air inlet end of the seamless steel pipe (530), the air outlet end of the seamless steel pipe (530) is connected to the smoke outlet pipe of the economizer, and the two ends of the reducer (540) are respectively connected to the B port of the electric three-way valve (330) and the seamless steel pipe (530); one end of the seamless steel pipe (530) away from the air heater (520) is connected to a nozzle (580), and one end of the nozzle (580) away from the air heater (520) is connected to a sleeve (590), and one end of the sleeve (590) away from the nozzle (580) is fixedly penetrated into the inner cavity of the smoke outlet pipe of the economizer.

2. The fly ash internal circulation disposal system according to claim 1, characterized in that: The large-diameter port of the reducer (540) is in communication with the B port of the electric three-way valve (330), and the small-diameter port of the reducer (540) is in communication with the seamless steel pipe (530).

3. The fly ash internal circulation disposal system according to claim 2, characterized in that: A metal expansion joint (550) is installed on the seamless steel pipe (530), and the metal expansion joint (550) is located between the air heater (520) and the reducer (540).

4. The fly ash internal circulation disposal system according to claim 3, characterized in that: A pressure gauge (560) and a thermometer (570) are also installed on the seamless steel pipe (530), and the pressure gauge (560) and the thermometer (570) are both located between the metal expansion joint (550) and the reducer (540).

5. The fly ash internal circulation disposal system according to claim 1, characterized in that: The surfaces of the air heater (520), the seamless steel pipe (530) and the reducer (540) are all fixedly sleeved with a ceramic fiber blanket, the thickness of the ceramic fiber blanket is 50 mm, the specific gravity of the fly ash transported in the seamless steel pipe (530) is 0.8 to 1.0 .

6. A fly ash internal circulation disposal method, characterized in that: The fly ash internal circulation treatment system according to claim 5 is used to treat the fly ash in an internal circulation manner, which specifically comprises the following steps: S1. Flue gas purification treatment: The induced draft fan (230) is started, and the induced draft fan (230) sequentially introduces the flue gas into the purification system (100) and the filtration system (200) to meet the flue gas purification and filtration requirements, so that the flue gas of the incinerator enters the inner cavity of the rotary spray deacidification reaction tower (110) through the flue of the waste heat boiler, and the slaked lime is quantitatively transported to the inner cavity of the slaked lime slurry preparation tank (140) through the slaked lime bin (130), and then water is quantitatively added to the inner cavity of the slaked lime slurry preparation tank (140), and the slaked lime is transported to the inner cavity of the slaked lime slurry preparation tank (140) through the slaked lime slurry preparation tank (140). and water to obtain a slaked lime slurry having a concentration of 20%, and the slaked lime slurry is transported to a slaked lime slurry storage tank (150) for storage. The slaked lime slurry storage tank (150) transports the slaked lime slurry to a rotary spray deacidification reaction tower (110) in a quantitative manner. The slurry is atomized into droplets by an atomizer, and contacts with flue gas in the rotary spray deacidification reaction tower (110) to produce a chemical reaction. Cooling water is passed through a water tank (120) and atomized into droplets by an atomizer to reduce the temperature in the rotary spray deacidification reaction tower (110), thereby achieving a flue gas purification operation. S2, flue gas filtration treatment: the dust bags in the bag filter (210) can be pre-coated with lime through the slaked lime bin (130) to prevent the dust bags from being stuck or corroded when filtering a large amount of oil fume pollution and other corrosive gases or particulates, which helps to extend the service life of the dust bags; the purified flue gas is discharged into the inner cavity of the bag filter (210) through the gas outlet of the rotary spray deacidification reaction tower (110); activated carbon is added to the bag filter (210) through the activated carbon bin (220) to capture and remove dust particles in the flue gas, thereby achieving separation of flue gas and dust; the bag filter (210) can filter the flue gas to capture dust particles in the flue gas on the dust bags; and the filtered flue gas is finally discharged through the chimney (240), thus achieving the filtering operation of the flue gas; S3, fly ash storage treatment: the ash discharge ports of the rotary spray deacidification reaction tower (110) and the bag filter (210) respectively transport the fly ash to the inner cavity of the fly ash bin (310) through screw conveyors for unified storage, thus realizing the storage operation of the fly ash; S4, fly ash internal circulation treatment: Port B of the electric three-way valve (330) quantitatively transports the fly ash to the inner cavity of the seamless steel pipe (530), starts the Roots blower (510) and the air heater (520), and the air heater (520) heats the air. The Roots blower (510) transports the heated air to the inner cavity of the seamless steel pipe (530), so that the fly ash in the seamless steel pipe (530) is transported to the inner cavity of the nozzle (580) through the seamless steel pipe (530), and is sprayed into the economizer smoke outlet pipe by the nozzle (580), so that the fly ash is transported to the horizontal flue of the rotary spray deacidification reaction tower (110) at the dry slaked lime injection port through the economizer smoke outlet pipe, and the unreacted slaked lime at the bottom of the rotary spray deacidification reaction tower (110) is removed. , and continue to undergo secondary chemical reactions with the acidic gases in the flue gas in the horizontal flue.

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