CN115435578A - Drying system and method for washed fly ash water of waste incineration boiler - Google Patents
Drying system and method for washed fly ash water of waste incineration boiler Download PDFInfo
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- CN115435578A CN115435578A CN202211065952.2A CN202211065952A CN115435578A CN 115435578 A CN115435578 A CN 115435578A CN 202211065952 A CN202211065952 A CN 202211065952A CN 115435578 A CN115435578 A CN 115435578A
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- flue gas
- fly ash
- steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B20/00—Combinations of machines or apparatus covered by two or more of groups F26B9/00 - F26B19/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
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Abstract
The invention provides a system and a method for drying washed fly ash water of a waste incineration boiler, wherein the system for drying washed fly ash water of the waste incineration boiler comprises the following steps: the boiler chimney, the steam flue gas preheater, the rotary flash dryer, the high-efficiency cyclone dust collector and the pulse bag dust collector are connected in sequence; wherein, steam flue gas preheater's heat source import and steam turbine intercommunication, high-efficient cyclone is connected with the double helix feeder who is used for the material loading, and booster fan and boiler chimney intercommunication are passed through to the gas outlet of pulse sack cleaner, and high-efficient cyclone and pulse sack cleaner bottom are connected with buried scraper conveyor through star type tripper, and buried scraper conveyor with carry to the flying dust storehouse and be connected. The drying system for the washed fly ash of the waste incineration boiler can be used for replacing the conventional washed fly ash drying technology, so that the treatment cost of the fly ash of the waste incineration boiler is reduced.
Description
Technical Field
The invention relates to the technical field of fly ash disposal of a waste incineration boiler, in particular to a system and a method for drying washed fly ash of a waste incineration boiler.
Background
The fly ash of the waste incineration boiler is hazardous waste (code: 772-002-18), the dioxin content is high, and the leaching concentration of heavy metal exceeds the standard. In 2021, the annual production of fly ash in domestic waste incineration boilers is about 1000 ten thousand tons, and the average annual production of each waste incineration plant is about 2 ten thousand tons.
The main disposal route of the fly ash of the waste incineration boiler is landfill after solidification/stabilization, which accounts for about 90 percent of the total treatment amount. The method for landfill after curing/stabilizing occupies a large amount of land resources, dioxin, heavy metal and the like are not really removed, the dioxin, heavy metal and the like can pollute the environment again along with the aging of the coating and the erosion of rainwater, and the technical route for landfill after curing/stabilizing does not realize harmlessness, recycling and reduction in the long term.
Aiming at the defects of a landfill disposal method after solidification/stabilization, routes such as cement kiln cooperative disposal, high-temperature melting disposal, low-temperature pyrolysis disposal and the like are adopted in domestic conditional areas at present.
In cities with cement plants, "cement kiln co-treatment" is recommended, and "high-temperature melting treatment" and "low-temperature pyrolysis treatment" are the priority technical routes for developed areas such as the Long triangular and the bead triangular areas.
However, both the "high temperature melt processing" and "low temperature pyrolysis processing" routes face processing costs much greater than "curing/stabilizing" post-landfill disposal. Whether the treatment is high-temperature melting treatment or low-temperature pyrolysis treatment, the fly ash needs to be subjected to centrifugal washing pretreatment to remove chloride ions and part of heavy metals and recover sodium salts, potassium salts and the like for resource utilization, the water content of the washed ash is high, generally 40-45%, when the treatment route is adopted, a large amount of electric energy is consumed by water vapor evaporation, the difficulty of tail gas treatment is increased, and the treatment cost is a big reason.
In view of this, the drying system for the waste incineration boiler after flying ash water washing, which takes the boiler chimney waste gas as the main heat source and the low-quality steam extraction of the steam turbine as the auxiliary heat source, has very important practical significance.
Disclosure of Invention
The system and the method for drying the fly ash of the waste incineration boiler after washing are used for replacing the conventional ash washing and drying technology, so that the treatment cost of the fly ash of the waste incineration boiler is reduced.
The technical scheme provided by the invention is as follows: a drying system for washed fly ash water of a waste incineration boiler comprises: the boiler chimney, the steam smoke preheater, the rotary flash dryer, the high-efficiency cyclone dust collector and the pulse bag dust collector are connected in sequence; the system comprises a steam flue gas preheater, a high-efficiency cyclone dust collector, a boiler chimney, a booster fan, a buried scraper conveyer and a pulse bag dust collector, wherein a heat source inlet of the steam flue gas preheater is communicated with a steam turbine, the high-efficiency cyclone dust collector is connected with a double-helix feeding device used for feeding, a gas outlet of the pulse bag dust collector is communicated with the boiler chimney through the booster fan, the bottoms of the high-efficiency cyclone dust collector and the pulse bag dust collector are connected with the buried scraper conveyer through a star-shaped discharger, and the buried scraper conveyer is connected with a fly ash bin through conveying.
Furthermore, a first flue gas pipeline is connected between the boiler chimney and the steam flue gas preheater, and a first pressure gauge, a first temperature gauge, a flue gas flowmeter and a closing door are arranged on the first flue gas pipeline.
Furthermore, the distance between the smoke taking point of the first smoke pipeline on the boiler chimney and the outlet of the boiler induced draft fan is more than 10m.
Furthermore, a low-pressure steam pipeline is connected between the steam turbine and the steam flue gas preheater, and a steam pressure gauge, a steam thermometer, a steam flow meter and an adjusting valve are arranged on the low-pressure steam pipeline.
Furthermore, a second flue gas pipeline is connected between the steam flue gas preheater and the rotary flash evaporation dryer, and a second pressure gauge and a second thermometer are arranged on the second flue gas pipeline.
Furthermore, the outlet of the double-screw feeding device is connected with the inlet of the rotary flash dryer, the lower part of the rotary flash dryer is provided with a stirring knife, and the upper part of the rotary flash dryer is provided with a grading ring.
Furthermore, a third flue gas pipeline is connected between the rotary flash evaporation dryer and the efficient cyclone dust collector, and a third pressure gauge and a third temperature gauge are arranged on the third flue gas pipeline.
Furthermore, a fourth flue gas pipeline is connected between the high-efficiency cyclone dust collector and the pulse bag dust collector, and a fourth pressure gauge and a fourth thermometer are arranged on the fourth flue gas pipeline.
Furthermore, a fifth flue gas pipeline is connected between the pulse bag-type dust collector and the booster fan, and a fifth pressure gauge and a fifth thermometer are arranged on the fifth flue gas pipeline.
Furthermore, a sixth flue gas pipeline is connected between the booster fan and the boiler chimney, and a sixth pressure gauge and a sixth temperature gauge are arranged on the sixth flue gas pipeline.
Furthermore, the vertical distance between the smoke returning point of the sixth smoke pipeline on the boiler chimney and the smoke taking point of the first smoke pipeline on the boiler chimney is more than 3 times of the diameter of the chimney.
A drying method for washed fly ash water of a waste incineration boiler utilizes a drying system to carry out drying, and comprises the following steps:
s1, extracting waste gas from a boiler chimney through a first flue gas pipeline to serve as a main heat source of a drying system, wherein the extracted flue gas accounts for 11% of the total exhaust gas amount of the boiler chimney, and the temperature of the flue gas is 135 ℃;
s2, extracting low-quality steam from a steam turbine through a low-pressure steam pipeline to serve as an auxiliary heat source of a drying system, wherein the temperature of the steam is 300 ℃;
s3, regulating the flow of steam through a regulating valve arranged on a low-pressure steam pipeline, and raising the temperature of the flue gas from 135 ℃ to 180 ℃;
and S4, allowing the flue gas heated in the step S3 to enter a spin flash dryer, simultaneously operating a double-helix feeding device to convey washing ash into the spin flash dryer, rapidly drying the washing ash under the action of a stirring knife at the lower part of the spin flash dryer, and selecting the tower diameter of the spin flash dryer according to the amount of the extracted flue gas to ensure that the flow rate of the empty tower is 4-5 m/S through the action of an upper grading ring to ensure that the moisture content of the dried fly ash is 5%.
And S5, interlocking the flue gas temperature of the third flue gas pipeline and the motor rotating speed of the double-helix feeding device, and changing the heat transfer quantity in the spin flash dryer by increasing and decreasing the feeding quantity so as to keep the flue gas temperature of the third flue gas pipeline at 100 ℃.
S6, the fly ash dried in the step S4 enters a high-efficiency cyclone dust collector along with the flue gas for separation, and a small amount of residual fine fly ash enters a pulse bag dust collector for further separation;
s7, in the step S6, the fly ash separated by the high-efficiency cyclone dust collector and the pulse bag dust collector enters an embedded scraper conveyer through a star-shaped discharger below an ash bucket and is conveyed to a fly ash bin through the embedded scraper conveyer;
and S8, in the step S6, the flue gas separated by the pulse bag-type dust remover enters a booster fan through a fifth flue gas pipeline, is boosted by the booster fan and then is introduced into a boiler chimney through a sixth flue gas pipeline for emission.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the drying system and method for the waste incineration boiler after ash washing, waste gas is extracted from the boiler chimney to serve as a main heat source of the drying system, low-quality steam is extracted from the steam turbine to serve as an auxiliary heat source of the drying system, energy cost for drying the water washing ash is greatly reduced, the boiler chimney waste gas and the steam turbine low-quality steam extraction parameters are relatively stable, and system stability is good.
(2) The drying system for the waste incineration boiler after ash washing utilizes the booster fan to maintain the negative pressure state in the drying process, effectively avoids the escape of the ash and meets the requirement of environmental protection.
(3) The drying system for the washed fly ash of the waste incineration boiler well solves the problem that the washed fly ash is difficult to effectively dry by adopting a common drying technology because the washed fly ash is high in viscosity and pasty.
(4) The drying system for the washed fly ash of the waste incineration boiler has the advantages that the boiler chimney and the steam turbine are the existing equipment of the waste incineration power plant, the rest equipment has compact structure, the drying system is particularly suitable for reconstruction and expansion of the existing waste incineration power plant, and the drying system has very important practical significance for changing the current situation that most fly ash of the waste incineration boiler needs to be transported and treated.
Drawings
FIG. 1 is a schematic view showing the overall structure of the post-ash-washing drying system of the waste incineration boiler of the present invention.
The reference numbers are as follows: 1. boiler chimney, 2, steam flue gas preheater, 3, steam turbine, 4, spin flash dryer, 401, stirring knife, 402, grading ring, 5, double helix feeding device, 6, high efficiency cyclone, 7, pulse bag dust collector, 8, booster fan, 9, star discharger, 10, buried scraper conveyor, 11, fly ash bin, 12, first flue gas pipeline, 1201, first pressure gauge, 1202, first temperature gauge, 1203, flue gas flowmeter, 1204, closing door, 13, second flue gas pipeline, 1301, second pressure gauge, 1302, second temperature gauge, 14, low pressure steam pipeline, 1401, steam pressure gauge, 1402, steam temperature gauge, 1403, steam flow meter, 1404, regulating door, 15, third flue gas pipeline, 1501, third pressure gauge, 1502, third temperature gauge, 16, fourth flue gas pipeline, 1601, fourth pressure gauge, 1602, fourth temperature gauge, 17, fifth flue gas pipeline, 1701, fifth temperature gauge, 1702, fifth temperature gauge, 18, sixth flue gas pipeline, 1, sixth temperature gauge, 1802, 1801, sixth temperature gauge, 180, 1806, sixth temperature gauge, and the like.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention is a system for drying post-ash-washing fly ash of a waste incineration boiler, comprising: the system comprises a boiler chimney 1, a steam flue gas preheater 2, a rotary flash dryer 4, a high-efficiency cyclone dust collector 6 and a pulse bag dust collector 7 which are connected in sequence; wherein, steam flue gas preheater 2's heat source import and steam turbine 3 intercommunication, high-efficient cyclone 6 is connected with the double helix feeder 5 that is used for the material loading, and booster fan 8 and boiler chimney 1 intercommunication are passed through to pulse bag dust collector 7's gas outlet, and high-efficient cyclone 6 and pulse bag dust collector 7 bottom are connected with buried scraper conveyor 10 through star tripper 9, and buried scraper conveyor 10 with carry to fly ash storehouse 11 and be connected.
The boiler stack 1 of the present embodiment is an existing device of a boiler plant of a waste incineration power plant for discharging boiler flue gases into the environment.
The steam flue gas preheater 2 of this embodiment is current heat transfer equipment, transfers the latent heat of vaporization of steam through heat exchange and is used for heating the flue gas.
The steam turbine 3 of the embodiment is an existing device of a waste incineration power plant, and high-pressure steam expands in the steam turbine 3 to do work and is converted into low-quality steam.
Further, an outlet of the double-spiral feeding device 5 is connected with an inlet of the rotary flash dryer 4, a stirring knife 401 is arranged at the lower part of the rotary flash dryer 4, and a grading ring 402 is arranged at the upper part of the rotary flash dryer 4.
The spin flash dryer 4 of this embodiment is current drying equipment, and its theory of operation is: at spin flash dryer 4 bottom, the washing ash that becomes the paste is broken fast and is dried under stirring sword 401's shearing action and under the promotion of rotatory air current, and the granule that the moisture content is lower, the volume is less is carried secretly by rotatory air current and is risen, further drying at the rising in-process, through setting up hierarchical ring 402, can block that the granule that does not reach the drying requirement leaves spin flash dryer 4, makes it stay and continues drying in spin flash dryer 4.
The double-helix feeding device 5 of the embodiment is a double-helix feeding machine, is conventional existing feeding equipment, and can realize the control of feeding amount by controlling the rotating speed of a motor.
The high-efficiency cyclone dust collector 6 and the pulse bag dust collector 7 of the embodiment are both conventional existing dust collecting equipment and can be used for filtering fly ash in flue gas.
The star discharger 9 of the embodiment is conventional existing discharge equipment, is used for being installed at discharge openings of the high-efficiency cyclone dust collector 6 and the pulse bag dust collector 7, can discharge fly ash by means of a rotating impeller, and can prevent air from being sucked in the conveying process.
The scraper conveyor 10 of the embodiment is a transportation device for transporting the bulk material to a predetermined target by means of scraper chains moving in a closed housing, and reduces pollution of fly ash during transportation.
Further, a first flue gas pipeline 12 is connected between the boiler chimney 1 and the steam flue gas preheater 2, and a first pressure gauge 1201, a first temperature gauge 1202, a flue gas flowmeter 1203 and a closing door 1204 are arranged on the first flue gas pipeline 12.
The first pressure gauge 1201 of the present embodiment is used to monitor the pressure in the first flue gas duct 12.
The first thermometer 1202 of the present embodiment is used to monitor the temperature of the flue gas in the first flue gas duct 12.
The flue gas flow meter 1203 of the present embodiment is used for monitoring the flue gas flow in the first flue gas duct 12.
Specifically, the closing door 1204 is in an open state when the drying system is operated.
Furthermore, the distance between the smoke taking point of the first smoke pipeline 12 on the boiler chimney 1 and the outlet of the boiler induced draft fan is more than 10m, so that the phenomena of vibration of the boiler induced draft fan and vacuum suction of the first smoke pipeline 12 are avoided.
Further, a low-pressure steam pipeline 14 is connected between the steam turbine 3 and the steam flue gas preheater 2, and a steam pressure gauge 1401, a steam thermometer 1402, a steam flow meter 1403 and an adjusting door 1404 are arranged on the low-pressure steam pipeline 14.
The steam pressure gauge 1401 of the present embodiment is used to monitor the pressure in the low-pressure steam pipe 14.
The vapor thermometer 1402 of the present embodiment is used to monitor the temperature of the vapor within the low pressure vapor line 14.
The steam flow meter 1403 of the present embodiment is used to monitor the flow rate of steam in the low-pressure steam pipe 14.
The regulating gate 1404 of the embodiment is used for regulating the flow rate of the steam in the low-pressure steam pipeline 14 so as to increase the temperature of the flue gas; when the drying system is operating, the damper 1404 is in an open state.
Further, a second flue gas pipeline 13 is connected between the steam flue gas preheater 2 and the spin flash dryer 4, and a second pressure gauge 1301 and a second temperature gauge 1302 are arranged on the second flue gas pipeline 13.
The second pressure gauge 1301 and the second temperature gauge 1302 of the present embodiment are used to monitor the pressure and temperature, respectively, within the second flue gas duct 13.
Further, a third flue gas pipeline 15 is connected between the spin flash dryer 4 and the high-efficiency cyclone dust collector 6, and a third pressure gauge 1501 and a third temperature gauge 1502 are arranged on the third flue gas pipeline 15.
The third pressure gauge 1501 and the third temperature gauge 1502 of this embodiment are used to monitor the pressure and temperature, respectively, in the third flue gas duct 15.
Further, a fourth flue gas pipeline 16 is connected between the high-efficiency cyclone dust collector 6 and the pulse bag dust collector 7, and a fourth pressure gauge 1601 and a fourth temperature gauge 1602 are arranged on the fourth flue gas pipeline 16.
A fourth pressure gauge 1601 and a fourth temperature gauge 1602 are provided for monitoring the pressure and temperature, respectively, in the fourth flue gas duct 16.
Further, a fifth flue gas pipeline 17 is connected between the pulse bag dust collector 7 and the booster fan 8, and a fifth pressure gauge 1701 and a fifth temperature gauge 1702 are arranged on the fifth flue gas pipeline 17.
The fifth pressure gauge 1701 and the fifth temperature gauge 1702 of the present embodiment are used to monitor the pressure and temperature, respectively, in the fifth flue gas duct 17.
Further, a sixth flue gas pipeline 18 is connected between the booster fan 8 and the boiler chimney 1, and a sixth pressure gauge 1801 and a sixth temperature gauge 1802 are arranged on the sixth flue gas pipeline 18.
The sixth pressure gauge 1801 and the sixth temperature gauge 1802 of the present embodiment are used to monitor the pressure and temperature, respectively, within the sixth flue gas duct 18.
Further, the vertical distance between the smoke returning point of the sixth smoke pipeline 18 on the boiler chimney 1 and the smoke taking point of the first smoke pipeline 12 on the boiler chimney 1 is more than 3 times of the diameter of the chimney, so that severe disturbance of smoke is avoided.
A drying method for washed fly ash water of a waste incineration boiler utilizes a drying system to carry out drying, and comprises the following steps:
s1, extracting waste gas from a boiler chimney 1 through a first flue gas pipeline 12 to serve as a main heat source of a drying system, wherein the extracted waste gas accounts for 11% of the total exhaust gas amount of the boiler chimney 1, and the temperature of the waste gas is 135 ℃.
And S2, extracting low-quality steam from the steam turbine 3 through a low-pressure steam pipeline 14 to be used as an auxiliary heat source of the drying system, wherein the temperature of the steam is 300 ℃.
And S3, regulating the flow of the steam through a regulating door 1404 arranged on the low-pressure steam pipeline 14, and raising the temperature of the flue gas from 135 ℃ to 180 ℃.
S4, the flue gas heated in the step S3 enters a rotary flash evaporation dryer 4, a double-helix feeding device 5 is operated to convey washing ash into the rotary flash evaporation dryer 4, the washing ash is quickly dried under the action of a stirring knife 401 at the lower part of the rotary flash evaporation dryer 4, the water content of the dried fly ash is enabled to be 5% through the action of an upper grading ring 402, the tower diameter of the rotary flash evaporation dryer 4 is selected according to the extracted flue gas volume, and the flow speed of an empty tower is enabled to be 4-5 m/S.
S5, establishing interlocking between the flue gas temperature of the third flue gas pipeline 15 and the motor rotating speed of the double-helix feeding device 5, and changing the heat transfer quantity in the spin flash dryer 4 by increasing and decreasing the feeding quantity so as to keep the flue gas temperature of the third flue gas pipeline 15 at 100 ℃.
Specifically, the flue gas temperature of the third flue gas pipeline 15 and the rotating speed of the double-helix feeding device 5 are interlocked, so that the flue gas temperature of the third flue gas pipeline 15 is kept at about 100 ℃, namely, the flue gas temperature exceeds the flue gas dew point temperature to 30 ℃, and the fly ash in equipment in a drying system and subsequent equipment can not be subjected to a moisture regain phenomenon.
The interlock control of the present embodiment is specifically as follows: when the temperature of the flue gas rises, the rotating speed of the motor of the double-helix feeding device 5 is increased, so that the feeding amount is increased, when the temperature of the flue gas falls, the rotating speed of the motor is reduced, so that the feeding amount is reduced, the heat transfer amount in the rotary flash evaporation dryer 4 is changed by increasing and reducing the feeding amount, and the temperature of the flue gas of the third flue gas pipeline 15 is kept.
S6, the fly ash dried in the step S4 enters the high-efficiency cyclone dust collector 6 along with the flue gas for separation, and a small amount of fine fly ash is further separated in the pulse bag dust collector 7.
S6, in the step S5, the fly ash separated by the high-efficiency cyclone dust collector 6 and the pulse bag dust collector 7 enters the embedded scraper conveyer 10 through the star-shaped discharger 9 below the ash bucket and is conveyed to the fly ash bin 11 through the embedded scraper conveyer 10.
S7, in the step S5, the flue gas separated by the pulse bag-type dust collector 7 enters the booster fan 11 through the fifth flue gas pipeline 17, is boosted by the booster fan 11 and then is introduced into the boiler chimney 1 through the sixth flue gas pipeline 18 for emission.
Furthermore, the inlet and outlet pressure drop of the pulse bag-type dust collector 7 is interlocked with the dust collection action, so that the automatic operation of the pulse bag-type dust collector 7 is realized.
Claims (12)
1. The washed drying system for the fly ash of the waste incineration boiler is characterized by comprising the following components: a boiler chimney (1), a steam flue gas preheater (2), a rotary flash dryer (4), a high-efficiency cyclone dust collector (6) and a pulse bag dust collector (7) which are connected in sequence; the system comprises a steam flue gas preheater (2), a steam turbine (3), a high-efficiency cyclone dust collector (6), a double-helix feeding device (5) used for feeding, a booster fan (8) and a boiler chimney (1) which are communicated with the gas outlet of a pulse bag dust collector (7), a star-shaped discharger (9) arranged at the bottom of the pulse bag dust collector (7) and an embedded scraper conveyor (10) connected with the bottom of the pulse bag dust collector (7), wherein the embedded scraper conveyor (10) is connected with a fly ash bin (11).
2. The post-washing drying system for the fly ash water of the waste incineration boiler according to claim 1, characterized in that a first flue gas pipe (12) is connected between the boiler chimney (1) and the steam flue gas preheater (2), and a first pressure gauge (1201), a first temperature gauge (1202), a flue gas flow meter (1203) and a closing door (1204) are arranged on the first flue gas pipe (12).
3. The post-washing drying system for the fly ash water of the waste incineration boiler according to claim 1, wherein a smoke taking point of the first smoke pipeline (12) on the boiler chimney (1) is more than 10m away from an outlet of a boiler induced draft fan.
4. The system for drying the washed fly ash water of the waste incineration boiler according to claim 1, wherein a low-pressure steam pipeline (14) is connected between the steam turbine (3) and the steam flue gas preheater (2), and a steam pressure gauge (1401), a steam temperature gauge (1402), a steam flow meter (1403) and an adjusting door (1404) are arranged on the low-pressure steam pipeline (14).
5. The post-ash-water-washing drying system of the waste incineration boiler according to claim 1, wherein a second flue gas pipeline (13) is connected between the steam flue gas preheater (2) and the spin flash dryer (4), and a second pressure gauge (1301) and a second temperature gauge (1302) are arranged on the second flue gas pipeline (13).
6. The washed drying system for the fly ash water of a waste incineration boiler according to claim 1, wherein an outlet of the double-spiral feeding device (5) is connected with an inlet of the spin-flash dryer (4), a stirring knife (401) is arranged at the lower part of the spin-flash dryer (4), and a grading ring (402) is arranged at the upper part of the spin-flash dryer (4).
7. The post-washing drying system for the fly ash water of the waste incineration boiler according to claim 1, wherein a third flue gas pipeline (15) is connected between the spin flash dryer (4) and the high-efficiency cyclone dust collector (6), and a third pressure gauge (1501) and a third temperature gauge (1502) are arranged on the third flue gas pipeline (15).
8. The washed fly ash water drying system of a waste incineration boiler according to claim 1, wherein a fourth flue gas pipeline (16) is connected between the high-efficiency cyclone dust collector (6) and the pulse bag dust collector (7), and a fourth pressure gauge (1601) and a fourth temperature gauge (1602) are arranged on the fourth flue gas pipeline (16).
9. The post-washing drying system for the fly ash water of the waste incineration boiler according to claim 1, wherein a fifth flue gas pipeline (17) is connected between the pulse bag dust collector (7) and the booster fan (8), and a fifth pressure gauge (1701) and a fifth temperature gauge (1702) are arranged on the fifth flue gas pipeline (17).
10. The post-washing drying system for the fly ash water of the waste incineration boiler according to claim 1, wherein a sixth flue gas pipeline (18) is connected between the booster fan (8) and the boiler chimney (1), and a sixth pressure gauge (1801) and a sixth temperature gauge (1802) are arranged on the sixth flue gas pipeline (18).
11. The post-ash-washing drying system for a waste incineration boiler according to claim 1, characterized in that the vertical distance between the flue gas return point of the sixth flue gas duct (18) on the boiler stack (1) and the flue gas taking point of the first flue gas duct (12) on the boiler stack (1) is more than 3 times the diameter of the stack.
12. A method for drying post-washed fly ash water of a waste incineration boiler by using the drying system of claims 1 to 11, comprising the steps of:
s1, extracting waste gas from a boiler chimney (1) through a first flue gas pipeline (12) to serve as a main heat source of a drying system, wherein the extracted waste gas accounts for 11% of the total smoke exhaust amount of the boiler chimney (1), and the temperature of the waste gas is 135 ℃;
s2, extracting low-quality steam from the steam turbine (3) through a low-pressure steam pipeline (14) to serve as an auxiliary heat source of the drying system, wherein the temperature of the steam is 300 ℃;
s3, regulating the flow of steam through a regulating door (1404) arranged on the low-pressure steam pipeline (14), and raising the temperature of the flue gas from 135 ℃ to 180 ℃;
s4, the flue gas heated in the step S3 enters a rotary flash evaporation dryer (4), a double-helix feeding device (5) is operated to convey washing ash into the rotary flash evaporation dryer (4), the washing ash is quickly dried under the action of a stirring knife (401) at the lower part of the rotary flash evaporation dryer (4), the moisture content of the dried fly ash is 5% through the action of an upper grading ring (402), and the tower diameter of the rotary flash evaporation dryer (4) is selected according to the amount of the extracted flue gas, so that the flow speed of an empty tower is 4-5 m/S.
S5, establishing interlocking between the flue gas temperature of the third flue gas pipeline (15) and the motor rotating speed of the double-helix feeding device (5), and changing the heat transfer quantity in the rotary flash evaporation dryer (4) by increasing and decreasing the feeding quantity so as to keep the flue gas temperature of the third flue gas pipeline (15) at 100 ℃.
S6, the fly ash dried in the step S4 enters a high-efficiency cyclone dust collector (6) along with the flue gas for separation, and a small amount of residual fine fly ash enters a pulse bag dust collector (7) for further separation;
s7, in the step S6, the fly ash separated by the high-efficiency cyclone dust collector (6) and the pulse bag dust collector (7) enters the embedded scraper conveyer (10) through a star-shaped discharger (9) below the ash bucket and is conveyed to the fly ash bin (11) through the embedded scraper conveyer (10);
s8, in the step S6, the flue gas separated by the pulse bag-type dust collector (7) enters the booster fan (11) through the fifth flue gas pipeline (17), is boosted by the booster fan (11) and then is introduced into the boiler chimney (1) through the sixth flue gas pipeline (18) for discharging.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375422A (en) * | 2021-06-25 | 2021-09-10 | 宝武集团环境资源科技有限公司 | Fly ash air-cooling drying system and process |
| CN216716847U (en) * | 2021-11-10 | 2022-06-10 | 山东天力能源股份有限公司 | Washing flying ash drying process system |
| CN216953964U (en) * | 2022-03-31 | 2022-07-12 | 中化(浙江)膜产业发展有限公司 | Dechlorination flying ash drying device |
| CN114956618A (en) * | 2022-05-24 | 2022-08-30 | 安徽海螺环保集团有限公司 | Cement kiln co-processing fly ash system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375422A (en) * | 2021-06-25 | 2021-09-10 | 宝武集团环境资源科技有限公司 | Fly ash air-cooling drying system and process |
| CN216716847U (en) * | 2021-11-10 | 2022-06-10 | 山东天力能源股份有限公司 | Washing flying ash drying process system |
| CN216953964U (en) * | 2022-03-31 | 2022-07-12 | 中化(浙江)膜产业发展有限公司 | Dechlorination flying ash drying device |
| CN114956618A (en) * | 2022-05-24 | 2022-08-30 | 安徽海螺环保集团有限公司 | Cement kiln co-processing fly ash system |
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