CN212005649U - Boiler fly ash reburning device - Google Patents
Boiler fly ash reburning device Download PDFInfo
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- CN212005649U CN212005649U CN201921959109.2U CN201921959109U CN212005649U CN 212005649 U CN212005649 U CN 212005649U CN 201921959109 U CN201921959109 U CN 201921959109U CN 212005649 U CN212005649 U CN 212005649U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a boiler flying dust reburning device relates to boiler technical field, and the boiler upper end is linked together with cyclone, and cyclone is connected with the supplementary heating surface of boiler, and supplementary heating surface lower extreme is linked together with electrostatic precipitator, and electrostatic precipitator is linked together with the flying dust device, and the flying dust device is connected with the returning charge case, and the dipleg of returning charge case is connected with boiler furnace, and the returning charge ware is connected with the returning charge fan. The utility model mainly returns the boiler fly ash collected by the electrostatic precipitator to the return feeder leg of the boiler through the fly ash device, and enters the hearth to participate in combustion along with the return ash, thus increasing the circulating ash amount in the hearth, reducing the bed temperature, improving the hearth differential pressure, improving the hearth outlet temperature, reducing the fly ash carbon content and increasing the adaptation range of the boiler to the coal types; the temperature reaction interval of the ammonia water is reached by controlling the ash return amount of the fly ash, so that the ammonia water and the nitrogen oxide in the flue gas are fully reacted, and the ammonia escape is reduced.
Description
Technical Field
The utility model relates to a boiler technical field specifically is a boiler flying dust reburning device.
Background
The design of the circulating fluidized bed boiler of the existing thermal power plant is generally a novel domestic boiler type with low bed temperature, low bed pressure and low nitrogen combustion, and the original discharge amount of nitrogen oxides is 70-160mg/m3The Nox emission standard executed 10 months before 2017 is less than or equal to 200mg/m3. In the period, the flue gas emission requirement can be met without adopting a SNCR ammonia water feeding denitration mode. After 10 months in 2017, environmental protection departments in many regions implement ultra-low emission standards, and the emission standard of Nox is less than or equal to 50mg/m3(ii) a In order to achieve standard emission, the boiler adopts an SNCR (selective non-catalytic reduction) denitration mode, and a denitration agent is generally ammonia water or urea. The consumption of designed ammonia water is generally 0.3-0.5 ton/h, and needs to be adjusted according to the original discharge amount of oxynitride of a boiler; the original discharge amount is different according to the temperature of the hearth and the outlet temperature of the hearth, and the reaction temperature is controlled to be between 850 ℃ and 930 ℃ in general. In order to ensure the sulfur dioxide to reach the standard, the sulfur content in the raw coal needs to be controlled at a lower level (below 0.8%). In actual operation, the using amount of the ammonia water reaches 0.5-0.8 ton/h, which is obviously larger than the design value, and the carbon content of the fly ash reaches more than 12% at most; for the situation, the research and analysis are earnestly carried out; there are two main reasons for agreement: firstly, the temperature of the boiler bed is higher,when the load is high, the bed temperature reaches over 980 ℃, so that the oxynitride is sharply increased at the temperature, and the used ammonia water is also increased; secondly, the temperature of the outlet of the hearth is low, the load is difficult to be lifted, and the low differential pressure of the hearth is determined to be the main reason through careful analysis, and the low differential pressure of the hearth is closely related to the circulating ash content of the boiler, so that the improvement of the circulating ash content while the operation adjustment is carried out becomes urgent.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a boiler flying dust device that fires again to solve the problem of the improvement circulation ash volume that provides in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the boiler fly ash reburning device comprises a boiler, wherein the upper end of the boiler is communicated with a cyclone separator, the air outlet end of the cyclone separator is connected with an auxiliary heating surface of the boiler, the lower end of the auxiliary heating surface is communicated with an electrostatic dust collector, the ash outlet end of the electrostatic dust collector is communicated with a fly ash device, the fly ash device is connected with an ash storage room, the fly ash device is also connected with a material leg of a return box, the material leg of the return box is connected with a boiler hearth, and the lower end of the return box is connected with a return fan.
Further, the auxiliary heating surface comprises a superheater, an economizer and an air preheater, the superheater, the economizer and the air preheater are sequentially connected, the superheater is communicated with the cyclone separator, and the air preheater is communicated with the electrostatic dust collector.
Furthermore, the fly ash device comprises a powder pump, an ash conveying fan and an ash conveying pipeline, wherein an inlet of the powder pump is connected with an ash outlet end of the electrostatic dust collector, an outlet of the powder pump is communicated with the ash conveying pipeline, and the front end of the ash conveying pipeline is communicated with the ash conveying fan.
Furthermore, the ash conveying fan and the material returning fan are both Roots fans.
Furthermore, the material return box and the cyclone separator are both provided with two.
Further, the flying ash device is provided with two flying ash devices.
A method for reburning boiler fly ash comprises the following steps: the flue gas that has small granule that boiler furnace export exhaust gets into cyclone, separate out the cigarette ash of great granule under the centrifugal force effect in cyclone, the cigarette ash of great granule of separating gets back to furnace through the effect of returning the material fan in getting into the returning charge case and burns once more to play the effect of control bed temperature, in addition return the returning charge case of boiler through the flying dust device to the part small granule cigarette ash that electrostatic precipitator collected, get into furnace along with separating out the cigarette ash of great granule and participate in the burning.
Further, the residual small particle soot collected by the electrostatic precipitator is fed to a soot storage room through another fly ash device for temporary storage.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses mainly return the boiler flying dust that electrostatic precipitator collected to the return bin leg of boiler through the flying dust device, get into furnace along with returning the material ash and participate in the burning, just so increased the circulation ash volume in the furnace, the bed temperature has been reduced, the furnace differential pressure has been improved, the furnace exit temperature has also been improved, it makes aqueous ammonia and nitrogen oxide in the flue gas fully react to have reached the temperature reaction interval (800 plus 930 ℃) of aqueous ammonia through controlling flying dust return ash volume, ammonia escape has been reduced, simultaneously because the reduction of bed temperature, the original discharge of oxynitride of boiler also significantly reduces, the corresponding aqueous ammonia quantity that has also reduced; and because the fly ash is re-combusted again, the carbon content of the fly ash is also reduced, and simultaneously, the load-lifting capacity of the boiler is greatly enhanced due to the improvement of the circulating ash content. Meanwhile, the ash content requirement of the purchased coal can be properly reduced, the calorific value of the purchased coal is improved, and the transportation and use cost is reduced. The coal ash which becomes solid waste is conveyed back to the boiler and enters the circulating fluidized system again, so that the ash content is increased, and the fly ash returning amount is controlled by adjusting the ash feeding amount of the feeder. The pneumatic ash conveying system sets the material level to ensure the supply amount of the returned fly ash.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1 electrostatic precipitator, 2 superheater, 3 economizer, 4 air preheater, 5 boiler, 6 cyclone separator, 7 return box, 8 powder pump, 9 return fan and 10 ash conveying fan.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
referring to fig. 1, the boiler fly ash reburning device comprises a boiler 5, wherein the upper end of the boiler 5 is communicated with a cyclone separator 6, the air outlet end of the cyclone separator 6 is connected with an auxiliary heating surface of the boiler 5, the lower end of the auxiliary heating surface is communicated with an electrostatic dust collector 1, the ash outlet end of the electrostatic dust collector 1 is communicated with a fly ash device, the fly ash device is connected with an ash storage room, the fly ash device is also connected with a material leg of a return box, the material leg of the return box is connected with a hearth of the boiler 5, and the lower end of the return box is connected with a return fan 9.
The auxiliary heating surface comprises a superheater 2, an economizer 3 and an air preheater 4, the superheater 2, the economizer 3 and the air preheater 4 are sequentially connected, the superheater 2 is communicated with a cyclone separator 6, and the air preheater 4 is communicated with an electrostatic dust collector 1. The auxiliary heating surface absorbs the radiant heat of the high-temperature flue gas in the flue. The flue gas is reliably cooled, and the dust removal effect of the electrostatic dust collector 1 can be better after the molten ash is condensed into ash powder balls.
The cyclone separator 6 is composed of a shell, a screen and an exhaust pipe, wherein the upper part of the shell is cylindrical, the lower part of the shell is in a hollow round table shape with a big top and a small bottom, a feeding air inlet pipe is arranged on one side of the top of the shell, a straight-through downward powder outlet pipe is arranged at the bottom of the shell, the upper part of the screen is cylindrical, the lower part of the screen is in a conical shape with a lower conical top, a discharge pipe with an inclination is arranged at the bottom of the screen and is arranged in the shell, and the exhaust pipe is.
The material returning box comprises a hearth, a material returning pipe, an expansion joint, an air box, a U-shaped valve material returning box, a water-cooling heat exchange pipe, a water inlet collecting box, a water outlet collecting box, a material returning vertical pipe and a high-temperature heat insulation cyclone separator 6, wherein the water-cooling heat exchange pipe is arranged between the U-shaped valve material returning box and the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are respectively connected with the water inlet collecting box and the water outlet collecting box, the water inlet collecting box is communicated with a water inlet pipeline of the boiler 5, and the water outlet collecting box is communicated with a mixed collecting box of a. The material returning vertical pipe is connected with the lower end of the high-temperature heat-insulation cyclone separator 6, and the material returning vertical pipe and the high-temperature heat-insulation cyclone separator 6 form a blanking sealing loop. The lower end of the U-shaped valve return box is provided with an air box. Two ends of the material return pipe are respectively connected with the material return vertical pipe and the hearth, and an expansion joint is arranged on a vertical section of the material return pipe connected with the material return vertical pipe. The dust separated by the cyclone separator 6 enters the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are connected with the water inlet header and the water outlet header, and the high-temperature material in the material returning vertical pipe is cooled by heat exchange in the water-cooling heat exchange pipe. And fluidized loosening air is fed from the air box, and the material level difference between the ascending section and the descending section of the U-shaped valve material return box is used as the returning power of the circulating material, so that the circulating material is stably and orderly returned to the hearth, and the circulating combustion is realized. The high-temperature material separated from the high-temperature heat-insulation cyclone separator 6 is cooled to 150-200 ℃ by utilizing the heat exchange of the water-cooling heat exchange tube, so that the U-shaped valve return box does not slag and coke when in operation, and hot water exchanged by the water-cooling heat exchanger is sent into a mixing collection box of a water supply pipeline through a water outlet collection box, so that the temperature of water in the mixing collection box is improved, the heat efficiency of the boiler 5 is improved, and the energy is saved.
Example 2:
referring to fig. 1, the boiler fly ash reburning device comprises a boiler 5, wherein the upper end of the boiler 5 is communicated with a cyclone separator 6, the air outlet end of the cyclone separator 6 is connected with an auxiliary heating surface of the boiler 5, the lower end of the auxiliary heating surface is communicated with an electrostatic dust collector 1, the ash outlet end of the electrostatic dust collector 1 is communicated with a fly ash device, the fly ash device is connected with an ash storage room, the fly ash device is also connected with a material leg of a return box, the material leg of the return box is connected with a hearth of the boiler 5, and the lower end of the return box is connected with a return fan 9.
The auxiliary heating surface comprises a superheater 2, an economizer 3 and an air preheater 4, the superheater 2, the economizer 3 and the air preheater 4 are sequentially connected, the superheater 2 is communicated with a cyclone separator 6, and the air preheater 4 is communicated with an electrostatic dust collector 1. The auxiliary heating surface absorbs the radiant heat of the high-temperature flue gas in the flue. The flue gas is reliably cooled, and the dust removal effect of the electrostatic dust collector 1 can be better after the molten ash is condensed into ash powder balls. The fly ash device comprises a powder pump 8, an ash conveying fan 10 and an ash conveying pipeline, wherein an inlet of the powder pump 8 is connected with an ash outlet end of the electrostatic dust collector 1, an outlet of the powder pump 8 is communicated with the ash conveying pipeline, and the front end of the ash conveying pipeline is communicated with the ash conveying fan 10.
The cyclone separator 6 is composed of a shell, a screen and an exhaust pipe, wherein the upper part of the shell is cylindrical, the lower part of the shell is in a hollow round table shape with a big top and a small bottom, a feeding air inlet pipe is arranged on one side of the top of the shell, a straight-through downward powder outlet pipe is arranged at the bottom of the shell, the upper part of the screen is cylindrical, the lower part of the screen is in a conical shape with a lower conical top, a discharge pipe with an inclination is arranged at the bottom of the screen and is arranged in the shell, and the exhaust pipe is.
The material returning box comprises a hearth, a material returning pipe, an expansion joint, an air box, a U-shaped valve material returning box, a water-cooling heat exchange pipe, a water inlet collecting box, a water outlet collecting box, a material returning vertical pipe and a high-temperature heat insulation cyclone separator 6, wherein the water-cooling heat exchange pipe is arranged between the U-shaped valve material returning box and the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are respectively connected with the water inlet collecting box and the water outlet collecting box, the water inlet collecting box is communicated with a water inlet pipeline of the boiler 5, and the water outlet collecting box is communicated with a mixed collecting box of a. The material returning vertical pipe is connected with the lower end of the high-temperature heat-insulation cyclone separator 6, and the material returning vertical pipe and the high-temperature heat-insulation cyclone separator 6 form a blanking sealing loop. The lower end of the U-shaped valve return box is provided with an air box. Two ends of the material return pipe are respectively connected with the material return vertical pipe and the hearth, and an expansion joint is arranged on a vertical section of the material return pipe connected with the material return vertical pipe. The dust separated by the cyclone separator 6 enters the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are connected with the water inlet header and the water outlet header, and the high-temperature material in the material returning vertical pipe is cooled by heat exchange in the water-cooling heat exchange pipe. And fluidized loosening air is fed from the air box, and the material level difference between the ascending section and the descending section of the U-shaped valve material return box is used as the returning power of the circulating material, so that the circulating material is stably and orderly returned to the hearth, and the circulating combustion is realized. The high-temperature material separated from the high-temperature heat-insulation cyclone separator 6 is cooled to 150-200 ℃ by utilizing the heat exchange of the water-cooling heat exchange tube, so that the U-shaped valve return box does not slag and coke when in operation, and hot water exchanged by the water-cooling heat exchanger is sent into a mixing collection box of a water supply pipeline through a water outlet collection box, so that the temperature of water in the mixing collection box is improved, the heat efficiency of the boiler 5 is improved, and the energy is saved.
Example 3:
referring to fig. 1, the boiler fly ash reburning device comprises a boiler 5, wherein the upper end of the boiler 5 is communicated with a cyclone separator 6, the air outlet end of the cyclone separator 6 is connected with an auxiliary heating surface of the boiler 5, the lower end of the auxiliary heating surface is communicated with an electrostatic dust collector 1, the ash outlet end of the electrostatic dust collector 1 is communicated with a fly ash device, the fly ash device is connected with an ash storage room, the fly ash device is also connected with a material leg of a return box, the material leg of the return box is connected with a hearth of the boiler 5, and the lower end of the return box is connected with a return fan 9.
The auxiliary heating surface comprises a superheater 2, an economizer 3 and an air preheater 4, the superheater 2, the economizer 3 and the air preheater 4 are sequentially connected, the superheater 2 is communicated with a cyclone separator 6, and the air preheater 4 is communicated with an electrostatic dust collector 1. The auxiliary heating surface absorbs the radiant heat of the high-temperature flue gas in the flue. The flue gas is reliably cooled, and the dust removal effect of the electrostatic dust collector 1 can be better after the molten ash is condensed into ash powder balls. The fly ash device comprises a powder pump 8, an ash conveying fan 10 and an ash conveying pipeline, wherein an inlet of the powder pump 8 is connected with an ash outlet end of the electrostatic dust collector 1, an outlet of the powder pump 8 is communicated with the ash conveying pipeline, and the front end of the ash conveying pipeline is communicated with the ash conveying fan 10. The ash conveying fan 10 and the material returning fan 9 are both Roots fans. The two return boxes 7 and the two cyclone separators 6 are arranged. The flying ash device is provided with two.
The cyclone separator 6 is composed of a shell, a screen and an exhaust pipe, wherein the upper part of the shell is cylindrical, the lower part of the shell is in a hollow round table shape with a big top and a small bottom, a feeding air inlet pipe is arranged on one side of the top of the shell, a straight-through downward powder outlet pipe is arranged at the bottom of the shell, the upper part of the screen is cylindrical, the lower part of the screen is in a conical shape with a lower conical top, a discharge pipe with an inclination is arranged at the bottom of the screen and is arranged in the shell, and the exhaust pipe is.
The material returning box comprises a hearth, a material returning pipe, an expansion joint, an air box, a U-shaped valve material returning box, a water-cooling heat exchange pipe, a water inlet collecting box, a water outlet collecting box, a material returning vertical pipe and a high-temperature heat insulation cyclone separator 6, wherein the water-cooling heat exchange pipe is arranged between the U-shaped valve material returning box and the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are respectively connected with the water inlet collecting box and the water outlet collecting box, the water inlet collecting box is communicated with a water inlet pipeline of the boiler 5, and the water outlet collecting box is communicated with a mixed collecting box of a. The material returning vertical pipe is connected with the lower end of the high-temperature heat-insulation cyclone separator 6, and the material returning vertical pipe and the high-temperature heat-insulation cyclone separator 6 form a blanking sealing loop. The lower end of the U-shaped valve return box is provided with an air box. Two ends of the material return pipe are respectively connected with the material return vertical pipe and the hearth, and an expansion joint is arranged on a vertical section of the material return pipe connected with the material return vertical pipe. The dust separated by the cyclone separator 6 enters the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are connected with the water inlet header and the water outlet header, and the high-temperature material in the material returning vertical pipe is cooled by heat exchange in the water-cooling heat exchange pipe. And fluidized loosening air is fed from the air box, and the material level difference between the ascending section and the descending section of the U-shaped valve material return box is used as the returning power of the circulating material, so that the circulating material is stably and orderly returned to the hearth, and the circulating combustion is realized. The high-temperature material separated from the high-temperature heat-insulation cyclone separator 6 is cooled to 150-200 ℃ by utilizing the heat exchange of the water-cooling heat exchange tube, so that the U-shaped valve return box does not slag and coke when in operation, and hot water exchanged by the water-cooling heat exchanger is sent into a mixing collection box of a water supply pipeline through a water outlet collection box, so that the temperature of water in the mixing collection box is improved, the heat efficiency of the boiler 5 is improved, and the energy is saved.
Example 4:
referring to fig. 1, the boiler fly ash reburning device comprises a boiler 5, wherein the upper end of the boiler 5 is communicated with a cyclone separator 6, the air outlet end of the cyclone separator 6 is connected with an auxiliary heating surface of the boiler 5, the lower end of the auxiliary heating surface is communicated with an electrostatic dust collector 1, the ash outlet end of the electrostatic dust collector 1 is communicated with a fly ash device, the fly ash device is connected with an ash storage room, the fly ash device is also connected with a material leg of a return box, the material leg of the return box is connected with a hearth of the boiler 5, and the lower end of the return box is connected with a return fan 9.
The auxiliary heating surface comprises a superheater 2, an economizer 3 and an air preheater 4, the superheater 2, the economizer 3 and the air preheater 4 are sequentially connected, the superheater 2 is communicated with a cyclone separator 6, and the air preheater 4 is communicated with an electrostatic dust collector 1. The auxiliary heating surface absorbs the radiant heat of the high-temperature flue gas in the flue. The flue gas is reliably cooled, and the dust removal effect of the electrostatic dust collector 1 can be better after the molten ash is condensed into ash powder balls. The fly ash device comprises a powder pump 8, an ash conveying fan 10 and an ash conveying pipeline, wherein an inlet of the powder pump 8 is connected with an ash outlet end of the electrostatic dust collector 1, an outlet of the powder pump 8 is communicated with the ash conveying pipeline, and the front end of the ash conveying pipeline is communicated with the ash conveying fan 10. The fly ash device adopts pneumatic transmission, namely a method for conveying granular solid materials in a pipeline by using gas flow as transmission power. The flow conditions of the material in the pipeline are complex in practice and vary significantly mainly with the speed of the gas flow, the amount of material contained in the gas flow, the material properties of the material, etc. The solid content is lower than 1-10kg/m3, the operation gas velocity is higher (about 18-30 m/s), and the conveying distance is basically within 300 m. For the material seal pump of the prior mature equipment, the conveying operation is simple, no mechanical rotating part is needed, the conveying pressure is low, and no maintenance and maintenance are needed! The low-pressure system (dilute phase system) is divided into positive pressure and negative pressure, the system has high conveying speed and low material-gas ratio, the rotary valve is generally adopted for blanking, the air blower is used for providing the combination of air sources, the initial speed is generally 12M/S, the tail end speed is 25M/S, the conveying pressure is generally about 0.1MPA, and the tail end pressure is close to zero. The utility model discloses a low pressure malleation system (dilute phase system), the low circulation system that can not influence boiler 5 self of this system terminal pressure. The ash conveying fan 10 and the material returning fan 9 are both Roots fans. The two return boxes 7 and the two cyclone separators 6 are arranged. The flying ash device is provided with two.
The cyclone separator 6 is composed of a shell, a screen and an exhaust pipe, wherein the upper part of the shell is cylindrical, the lower part of the shell is in a hollow round table shape with a big top and a small bottom, a feeding air inlet pipe is arranged on one side of the top of the shell, a straight-through downward powder outlet pipe is arranged at the bottom of the shell, the upper part of the screen is cylindrical, the lower part of the screen is in a conical shape with a lower conical top, a discharge pipe with an inclination is arranged at the bottom of the screen and is arranged in the shell, and the exhaust pipe is.
The material returning box comprises a hearth, a material returning pipe, an expansion joint, an air box, a U-shaped valve material returning box, a water-cooling heat exchange pipe, a water inlet collecting box, a water outlet collecting box, a material returning vertical pipe and a high-temperature heat insulation cyclone separator 6, wherein the water-cooling heat exchange pipe is arranged between the U-shaped valve material returning box and the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are respectively connected with the water inlet collecting box and the water outlet collecting box, the water inlet collecting box is communicated with a water inlet pipeline of the boiler 5, and the water outlet collecting box is communicated with a mixed collecting box of a. The material returning vertical pipe is connected with the lower end of the high-temperature heat-insulation cyclone separator 6, and the material returning vertical pipe and the high-temperature heat-insulation cyclone separator 6 form a blanking sealing loop. The lower end of the U-shaped valve return box is provided with an air box. Two ends of the material return pipe are respectively connected with the material return vertical pipe and the hearth, and an expansion joint is arranged on a vertical section of the material return pipe connected with the material return vertical pipe. The dust separated by the cyclone separator 6 enters the material returning vertical pipe, two ends of the water-cooling heat exchange pipe are connected with the water inlet header and the water outlet header, and the high-temperature material in the material returning vertical pipe is cooled by heat exchange in the water-cooling heat exchange pipe. And fluidized loosening air is fed from the air box, and the material level difference between the ascending section and the descending section of the U-shaped valve material return box is used as the returning power of the circulating material, so that the circulating material is stably and orderly returned to the hearth, and the circulating combustion is realized. The high-temperature material separated from the high-temperature heat-insulation cyclone separator 6 is cooled to 150-200 ℃ by utilizing the heat exchange of the water-cooling heat exchange tube, so that the U-shaped valve return box does not slag and coke when in operation, and hot water exchanged by the water-cooling heat exchanger is sent into a mixing collection box of a water supply pipeline through a water outlet collection box, so that the temperature of water in the mixing collection box is improved, the heat efficiency of the boiler 5 is improved, and the energy is saved.
A method for reburning boiler fly ash comprises the following steps: 5 furnace outlet exhaust of boiler has the flue gas of small granule to get into cyclone 6, separate out the cigarette ash of great granule under the centrifugal force effect in cyclone 6, the cigarette ash of the great granule of separating gets into the returning charge incasement and gets back to furnace reburning through the effect of returning charge fan 9, and play the effect of control bed temperature, in addition, the little granule cigarette ash of part that collects 1 electrostatic precipitator passes through the fly ash device and loops back to the returning charge case of boiler 5, get into furnace along with the cigarette ash of the great granule of separation and participate in the burning. In addition, the remaining small particle soot collected by the electrostatic precipitator 1 is temporarily stored in a storage compartment by another fly ash device.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A boiler fly ash reburning device is characterized in that: the device comprises a boiler (5), wherein the upper end of the boiler (5) is communicated with a cyclone separator (6), the air outlet end of the cyclone separator (6) is connected with an auxiliary heating surface of the boiler (5), the lower end of the auxiliary heating surface is communicated with an electrostatic dust collector (1), the ash outlet end of the electrostatic dust collector (1) is communicated with a fly ash device, the fly ash device is connected with an ash storage room, the fly ash device is also connected with a material leg of a return box (7), the material leg of the return box (7) is connected with a hearth of the boiler (5), and the lower end of the return box (7) is connected with a return fan (9).
2. The boiler fly ash afterburning apparatus of claim 1, wherein: the auxiliary heating surface comprises a superheater (2), an economizer (3) and an air preheater (4), the superheater (2), the economizer (3) and the air preheater (4) are sequentially connected, the superheater (2) is communicated with a cyclone separator (6), and the air preheater (4) is communicated with the electrostatic dust collector (1).
3. The boiler fly ash afterburning apparatus of claim 1, wherein: the fly ash device comprises a powder pump (8), an ash conveying fan (10) and an ash conveying pipeline, wherein an inlet of the powder pump (8) is connected with an ash outlet end of the electrostatic dust collector (1), an outlet of the powder pump (8) is communicated with the ash conveying pipeline, and the front end of the ash conveying pipeline is communicated with the ash conveying fan (10).
4. The boiler fly ash afterburning apparatus of claim 3, wherein: the ash conveying fan (10) and the material returning fan (9) are both Roots fans.
5. The boiler fly ash afterburning apparatus of claim 1, wherein: the two return boxes (7) and the two cyclone separators (6) are arranged.
6. The boiler fly ash afterburning apparatus of claim 1, wherein: the flying ash device is provided with two.
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| CN201921959109.2U CN212005649U (en) | 2019-11-14 | 2019-11-14 | Boiler fly ash reburning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110701607A (en) * | 2019-11-14 | 2020-01-17 | 山东福宽生物工程有限公司 | Boiler fly ash reburning device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110701607A (en) * | 2019-11-14 | 2020-01-17 | 山东福宽生物工程有限公司 | Boiler fly ash reburning device and method |
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