CN112221339A - Wet desulphurization device and method for dry desulphurization ash - Google Patents
Wet desulphurization device and method for dry desulphurization ash Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a wet desulphurization device and a wet desulphurization method for dry desulphurization ash, wherein the method comprises the following steps of 1: feeding limestone in a limestone bin into a limestone ball mill through a conveying belt for grinding; step 2: conveying limestone ground by a limestone ball mill into a first slurry tank; and step 3: clear water is pumped into the first slurry tank through a liquid pipeline and is mixed with the ground limestone to form limestone slurry; and 4, step 4: the limestone slurry flows into a second slurry tank through a pipeline; and 5: preparing dry desulfurization mortar liquid and storing the dry desulfurization mortar liquid in a third slurry tank, pumping the dry desulfurization mortar liquid into a second slurry tank through a first liquid pump, and mixing limestone slurry with the dry desulfurization mortar liquid to form mixed desulfurization liquid; step 6: and pumping the mixed desulfurization solution into a wet desulfurization absorption tower through a second liquid pump for flue gas desulfurization. The invention can apply the modified dry desulfurization ash to the wet desulfurization process, and reduce the pollution of the desulfurization by-products to the environment.
Description
Technical Field
The invention relates to desulfurization equipment and a method, in particular to a wet desulfurization device and a method for dry desulfurization ash.
Background
Under the strict requirements of national policies, some large-scale enterprises in China introduce sintering flue gas desulfurization devices into enterprise production, after the desulfurization devices are put into the enterprise production, the emission of harmful substances such as sulfur dioxide is reduced, but new problems follow, and the treated desulfurization byproducts become a large environmental problem.
Sulfur dioxide in the sintering flue gas becomes the most main pollutant in the steel industry, the emission reduction technology of waste gas becomes the key point of research subjects of steel enterprises and environmental protection enterprises, and the comprehensive utilization of the generated sintering flue gas desulfurization ash becomes another problem to be solved urgently.
At present, most of steel enterprises adopt a dry desulfurization technology to carry out desulfurization treatment on the burning flue gas. The composition of the desulfurized fly ash generated by the dry flue gas desulfurization technology is complex, the stability is poor, and the reutilization difficulty is high. The accumulation of the desulfurized fly ash not only occupies a large amount of land resources, but also consumes huge capital cost for disposal, and sulfide in the accumulation causes serious pollution to the environment. The existing desulfurized fly ash is mainly treated in a landfill mode, so that the waste of resources is caused. Therefore, the exploration of the comprehensive disposal and utilization mode of the dry flue gas desulfurization ash becomes a key way for building a green and environment-friendly resource-saving society in China.
Disclosure of Invention
The invention aims to provide a wet desulphurization device and a wet desulphurization method for dry desulphurization ash, which can be used for applying the dry desulphurization ash after being modified in a wet desulphurization process and reducing the pollution of desulphurization byproducts to the environment.
The invention is realized by the following steps:
a wet desulphurization device for dry desulphurization ash comprises a limestone bin, a conveyor belt, a limestone ball mill, a first slurry tank, a liquid inlet pipeline, a second slurry tank, a third slurry tank, a first liquid pump, a second liquid pump and a wet desulphurization absorption tower; the feeding end of the conveying belt is connected with a limestone storage bin, the discharging end of the conveying belt is connected with the feeding end of a limestone ball mill, and limestone in the limestone storage bin is conveyed into the limestone ball mill through the conveying belt; the discharge end of the limestone ball mill is connected with the feed end of the first slurry tank, the liquid inlet pipeline is connected with the liquid inlet end of the first slurry tank, clean water enters the first slurry tank through the liquid inlet pipeline, the discharge end of the first slurry tank is connected with the feed end of the second slurry tank, the discharge end of the third slurry tank is connected with the feed end of the second slurry tank through the first liquid pump, and dry desulfurization ash slurry stored in the third slurry tank is conveyed into the second slurry tank; the discharge end of the second slurry tank is connected to the feed end of the wet desulphurization absorption tower through a second liquid pump.
And stirrers are arranged in the first slurry tank and the second slurry tank.
A wet desulphurization method of dry desulphurization ash comprises the following steps:
step 1: feeding limestone in a limestone bin into a limestone ball mill through a conveying belt for grinding;
step 2: conveying limestone ground by a limestone ball mill into a first slurry tank;
and step 3: clear water is pumped into the first slurry tank through a liquid pipeline and is mixed with the ground limestone to form limestone slurry;
and 4, step 4: the limestone slurry flows into a second slurry tank through a pipeline;
and 5: preparing dry desulfurization mortar liquid and storing the dry desulfurization mortar liquid in a third slurry tank, pumping the dry desulfurization mortar liquid into a second slurry tank through a first liquid pump, and mixing limestone slurry with the dry desulfurization mortar liquid to form mixed desulfurization liquid;
step 6: and pumping the mixed desulfurization solution into a wet desulfurization absorption tower through a second liquid pump for flue gas desulfurization.
In the step 1, the feeding particle size of the limestone ball mill is not more than 25mm, and the discharging particle size is 0.07-0.4 mm.
In the step 3, the solid-to-liquid ratio of the ground limestone to the clear water is 1: 2-5.
In the step 5, the volume ratio of the limestone slurry to the dry desulfurization ash slurry is 10: 1-2.
The preparation method of the dry desulfurization ash slurry comprises the following steps:
step 5.1: preparing dry desulfurization ash from the desulfurization ash of the dry desulfurization device;
step 5.2: sieving the dry desulfurization ash to remove coarse particles;
step 5.3: selecting limestone with CaO content of 45.2-63.1% by mass, grinding the limestone by a ball mill, and sieving the ground limestone to remove coarse particles;
step 5.4: mixing the screened dry desulfurization ash and limestone to form mixed solid;
step 5.5: adding clear water into the mixed solid for mixing to form mixed slurry;
step 5.6: and adding calcium hydroxide and N-methyldiethanolamine into the mixed slurry, and stirring and vibrating to form dry desulfurization ash slurry.
The dry desulfurization ash comprises the following components in percentage by mass: CaO 25.3-49.2%, SiO28.8-27.6% of Fe2O31.3-15.2%, MgO 3.5-15.3%, and SO35.3-15.4% of Al2O32.3-18.1% and 0.75-6.9% of impurities.
In the step 5.4, the solid-to-solid ratio of the dry desulfurization ash to the limestone is 8-12: 1.
In the step 5.5, the solid-liquid ratio of the mixed solid to the clear water is 1: 2-3.
In the step 5.6, 2 to 3 grams of calcium hydroxide and 0.03 to 0.08 gram of N-methyldiethanolamine are added per liter of the mixed slurry.
The method can apply the modified dry-method desulfurization ash to a wet-method desulfurization process, reduce the pollution of desulfurization byproducts to the environment, reduce the operation cost by 2-8% compared with the prior art, solve the problem that the dry-method desulfurization technology influences the environment, and be applicable to the processes of steel production and the like.
Drawings
FIG. 1 is a front view of a wet desulfurization unit for dry desulfurization ash according to the present invention;
FIG. 2 is a flow diagram of a wet desulfurization process for dry desulfurized fly ash according to the invention.
In the figure, 1 limestone bin, 2 limestone, 3 conveyor belts, 4 limestone ball mills, 5 first slurry tanks, 6 liquid inlet pipelines, 7 second slurry tanks, 8 third slurry tanks, 9 dry desulfurization ash slurry, 10 first liquid pumps, 11 second liquid pumps and 12 wet desulfurization absorption towers.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a wet desulfurization apparatus for dry desulfurization ash comprises a limestone silo 1, a conveyor belt 3, a limestone ball mill 4, a first slurry tank 5, a liquid inlet pipeline 6, a second slurry tank 7, a third slurry tank 8, a first liquid pump 10, a second liquid pump 11 and a wet desulfurization absorption tower 12; the feeding end of the conveying belt 3 is connected with the limestone storage bin 1, the discharging end of the conveying belt 3 is connected with the feeding end of the limestone ball mill 4, and limestone 2 in the limestone storage bin 1 is conveyed into the limestone ball mill 4 through the conveying belt 3; the discharge end of the limestone ball mill 4 is connected with the feed end of the first slurry tank 5, the liquid inlet pipeline 6 is connected with the liquid inlet end of the first slurry tank 5, liquid such as clear water enters the first slurry tank 5 through the liquid inlet pipeline 6, the discharge end of the first slurry tank 5 is connected with the feed end of the second slurry tank 7, the discharge end of the third slurry tank 8 is connected with the feed end of the second slurry tank 7 through the first liquid pump 10, and the dry desulfurization ash slurry 9 stored in the third slurry tank 8 is conveyed into the second slurry tank 7; the discharge end of the second slurry tank 7 is connected to the feed end of the wet desulfurization absorption tower 12 through a second liquid pump 11.
And stirrers are arranged in the first slurry tank 5 and the second slurry tank 7 and are used for stirring and mixing the slurry.
Referring to fig. 2, a wet desulfurization method of dry desulfurization ash includes the following steps:
step 1: limestone 2 in a limestone silo 1 is fed into a limestone ball mill 4 through a conveyor belt 3 for grinding. Preferably, the rotating speed of the cylinder of the limestone ball mill 4 is 20-27 r/min, the feeding grain diameter of the limestone ball mill 4 is not more than 25mm, and the discharging grain diameter range is 0.07-0.4 mm.
Step 2: limestone ground by the limestone ball mill 4 is conveyed into the first slurry tank 5 by a conveyor belt.
And step 3: clean water is pumped into the first slurry tank 5 through the liquid pipeline 6 and is mixed with the ground limestone to form limestone slurry. Preferably, the solid-to-liquid ratio of the ground limestone to the clear water is 1: 2-5.
A stirrer is arranged in the first slurry tank 5, and the stirring speed of the stirrer of the first slurry tank 5 is 55-75 revolutions per minute.
And 4, step 4: the limestone slurry flows through a conduit into the second slurry tank 7.
And 5: preparing dry desulfurization ash slurry 9 and storing the dry desulfurization ash slurry in a third slurry tank 8, pumping the dry desulfurization ash slurry 9 into a second slurry tank 7 through a first liquid pump 10, and mixing limestone slurry with the dry desulfurization ash slurry 9 to form mixed desulfurization liquid. Preferably, the volume ratio of the limestone slurry to the dry desulfurization ash slurry 9 is 10: 1-2.
A stirrer is arranged in the second slurry tank 7, and the stirring speed of the stirrer of the second slurry tank 7 is 40-60 revolutions per minute.
The preparation method of the dry desulfurization ash slurry 9 comprises the following steps:
step 5.1: and preparing the dry desulfurization ash from the desulfurization ash of the dry desulfurization device. The dry desulfurization ash comprises the following components in percentage by mass: CaO 25.3-49.2%, SiO28.8-27.6% of Fe2O31.3-15.2%, MgO 3.5-15.3%, and SO35.3-15.4% of Al2O32.3-18.1 percent of the total content of the impurities and 0.75-6.9 percent of the total content of the impurities.
Step 5.2: and (4) sieving the dry desulfurization ash to remove coarse particles. Preferably, the dry desulfurized fly ash is sieved through a 100-mesh sieve.
Step 5.3: selecting limestone with CaO content of 45.2-63.1% by mass, grinding the limestone by a ball mill, and sieving the ground limestone to remove coarse particles. Preferably, the ground limestone is passed through a 100 mesh screen.
Step 5.4: and mixing the screened dry desulfurization ash and limestone to form mixed solid. Preferably, the solid-to-solid ratio of the dry desulfurization ash to the limestone is 8-12: 1.
Step 5.5: and adding clear water into the mixed solid to mix to form mixed slurry. Preferably, the solid-liquid ratio of the mixed solid to the clear water is 1: 2-3; the mixed solid and clear water are stirred for 5-10 minutes by a stirrer with a stirring speed of 60-80 rpm.
Step 5.6: and adding calcium hydroxide and N-methyldiethanolamine into the mixed slurry, and stirring and vibrating to form dry desulfurization ash slurry 9. Preferably, 2 to 3 grams of calcium hydroxide and 0.03 to 0.08 gram of N-methyldiethanolamine are added into each liter of the mixed slurry, and the mixture is stirred for 5 to 10 minutes by a stirrer with the stirring speed of 60 to 80 revolutions per minute and is subjected to ultrasonic oscillation for 5 to 8 minutes.
Step 6: the mixed desulfurization solution is pumped into a wet desulfurization absorption tower 12 through a second liquid pump 10 to carry out flue gas desulfurization.
Example 1:
limestone 2 in the limestone bin 1 is fed into a limestone ball mill 4 through a conveyor belt 3, the rotating speed of a cylinder of the limestone ball mill 4 is 22 revolutions per minute, the feeding particle size of the limestone ball mill 4 is 20 mm, and the discharging particle size is 0.09 mm. The limestone 2 ground after being discharged enters a first slurry tank 5 through a conveyor belt. Meanwhile, clear water is pumped into the first slurry tank 5 through the clear water pipeline 6, and the solid-to-liquid ratio of limestone levigated in the first slurry tank 5 to clear water is 1: 4, the agitator in the first slurry tank 5 is stirred at a speed of 65 rpm, and limestone slurry is formed in the first slurry tank 5 by stirring.
Limestone slurry in the first slurry tank 5 flows into the second slurry tank 7 through a pipeline, dry desulfurization ash slurry 9 in the third slurry tank 8 is pumped into the second slurry tank 7 through the first liquid pump 10, and the inflow of the dry desulfurization ash slurry 9 can be controlled through an automatic control system in the prior art. The ratio (volume ratio) of the limestone slurry to the dry desulfurization ash slurry 9 in the second slurry tank 7 was 10: 1. a stirrer is arranged in the second slurry tank 7, and the stirring speed is 45 revolutions per minute, so that mixed desulfurization liquid is formed. The mixed desulfurization liquid is pumped into the wet desulfurization absorption tower 12 through the second liquid pump 11 to carry out flue gas desulfurization, thereby avoiding the pollution of the landfill desulfurization ash deposits to the environment and being beneficial to desulfurization.
The dry desulfurization ash slurry is prepared according to the characteristics of desulfurization flue gas. The preparation steps are as follows:
1) the desulfurization ash is from a dry desulfurization device in the prior art, and is applied to the wet desulfurization absorption tower 12 for flue gas desulfurization after being modified. The dry desulfurization ash comprises the following components in percentage by mass: CaO 37.0%, SiO218.5% of Fe2O311.3% of MgO, 7.6% of SO38.1% of Al2O315.4%, and 2.1% other impurities. And (4) sieving the dry desulfurization ash with a 100-mesh sieve to remove coarse particles. 2) Limestone with CaO content of 52.3 percent by mass is selected, ground by a ball mill, and sieved by a 100-mesh sieve to remove coarse particles. 3) And (3) dry desulfurization ash and limestone according to a solid-solid ratio of 9: 1 mixing to form a mixed solid. Mixing solid and tap water according to a solid-liquid ratio of 1:2 and stirring the mixture for 5 minutes at a stirring speed of 60 revolutions per minute to form mixed slurry. 4) 2 g of calcium hydroxide and 0.05 g of N-methyldiethanolamine are added into each liter of the mixed slurry, and the mixture is stirred for 6 minutes at the stirring speed of 70 revolutions per minute and is subjected to ultrasonic oscillation for 7 minutes to finally form dry desulfurization ash slurry 9.
Example 2:
limestone 2 in the limestone bin 1 is conveyed into a limestone ball mill 4 through a conveying belt 3, the rotating speed of a cylinder of the limestone ball mill 4 is 26 revolutions per minute, the feeding particle size of the limestone ball mill 4 is 16 mm, and the discharging particle size is 0.2 mm. The limestone ground finely after the discharge enters the first slurry tank 5 through the conveyor belt. Simultaneously, clear water pipeline 6 is squeezed into first thick liquids case 5 with the clear water, and the solid-to-liquid ratio of lime stone and clear water is 1 in first thick liquids case 5: 2, the agitator in the first slurry tank 5 is stirred at a speed of 70 rpm, and limestone slurry is formed in the first slurry tank 5 by stirring.
Limestone slurry in the first slurry tank 5 flows into the second slurry tank 7 through a pipeline, dry desulfurization ash slurry 9 in the third slurry tank 8 is pumped into the second slurry tank 7 through the first liquid pump 10, and the inflow of the dry desulfurization ash slurry 9 can be controlled through an automatic control system in the prior art. The ratio (volume ratio) of the limestone slurry to the dry desulfurization ash slurry 9 in the second slurry tank 7 was 10: 2. the second slurry tank 7 is provided with a stirrer, and the stirring speed is 60 revolutions per minute, so that mixed desulfurization liquid is formed. The mixed desulfurization liquid is pumped into the wet desulfurization absorption tower 12 through the second liquid pump 11 to carry out flue gas desulfurization, thereby avoiding the pollution of the landfill desulfurization ash deposits to the environment and being beneficial to desulfurization.
The dry desulfurization ash slurry is prepared according to the characteristics of desulfurization flue gas. The preparation steps are as follows:
1) the desulfurization ash is from a dry desulfurization device in the prior art, and is applied to the wet desulfurization absorption tower 12 for flue gas desulfurization after being modified. The dry desulfurization ash comprises the following components in percentage by mass: CaO 32.5%, SiO211.3% of Fe2O313.9% of MgO, 11.1% of SO313.2% of Al2O315.1% and 2.9% other impurities. And (4) sieving the dry desulfurization ash with a 100-mesh sieve to remove coarse particles. 2) Limestone with CaO content of 55.9% by mass is selected, ground by a ball mill, and sieved by a 100-mesh sieve to remove coarse particles. 3) The dry desulfurization ash and limestone are mixed according to a solid-solid ratio of 12:1 mixing to form a mixed solid. Mixing solid and tap water according to a solid-liquid ratio of 1: 3 and stirring for 9 minutes at a stirring speed of 80 revolutions per minute to form mixed slurry. 4) 3 g of calcium hydroxide and 0.07 g of N-methyldiethanolamine are added into each liter of the mixed slurry, and the mixture is stirred for 7 minutes at the stirring speed of 80 revolutions per minute and is subjected to ultrasonic oscillation for 6 minutes to finally form dry desulfurization ash slurry 9.
Example 3:
limestone 2 in the limestone bin 1 is conveyed into a limestone ball mill 4 through a conveyor belt 3, the rotating speed of a cylinder of the limestone ball mill 4 is 27 revolutions per minute, the feeding particle size of the limestone ball mill 4 is 18 mm, and the discharging particle size is 0.3 mm. The limestone ground finely after the discharge enters the first slurry tank 5 through the conveyor belt. Simultaneously, clear water pipeline 6 is squeezed into first thick liquids case 5 with the clear water, and the solid-to-liquid ratio of lime stone and clear water is 1 in first thick liquids case 5: 3, the agitator in the first slurry tank 5 is stirred at 75 rpm, and limestone slurry is formed in the first slurry tank 5 by stirring.
Limestone slurry in the first slurry tank 5 flows into the second slurry tank 7 through a pipeline, dry desulfurization ash slurry 9 in the third slurry tank 8 is pumped into the second slurry tank 7 through the first liquid pump 10, and the inflow of the dry desulfurization ash slurry 9 can be controlled through an automatic control system in the prior art. The ratio (volume ratio) of the limestone slurry to the dry desulfurization ash slurry 9 in the second slurry tank 7 was 10: 1. the second slurry tank 7 is provided with a stirrer, and the stirring speed is 65 rpm, so that mixed desulfurization liquid is formed. The mixed desulfurization liquid is pumped into the wet desulfurization absorption tower 12 through the second liquid pump 11 to carry out flue gas desulfurization, thereby avoiding the pollution of the landfill desulfurization ash deposits to the environment and being beneficial to desulfurization.
The dry desulfurization ash slurry is prepared according to the characteristics of desulfurization flue gas. The preparation steps are as follows:
1) the desulfurization ash is from a dry desulfurization device in the prior art, and is applied to the wet desulfurization absorption tower 12 for flue gas desulfurization after being modified. The dry desulfurization ash comprises the following components in percentage by mass: CaO 37.5%, SiO29.7% of Fe2O310.2% of MgO, 9.9% of SO310.8% of Al2O317.3%, and 4.6% other impurities. And (4) sieving the dry desulfurization ash with a 100-mesh sieve to remove coarse particles. 2) Limestone with CaO content of 54.6% by mass is selected, ground by a ball mill, and sieved by a 100-mesh sieve to remove coarse particles. 3) The dry desulfurization ash and limestone are mixed according to a solid-solid ratio of 12:1 mixing to form a mixed solid. Mixing solid and tap water according to a solid-liquid ratio of 1: 3 and stirring the mixture for 10 minutes at a stirring speed of 75 revolutions per minute to form mixed slurry. 4) 2.5 g of calcium hydroxide and 0.06 g of N-methyldiethanolamine are added into each liter of the mixed slurry, the mixture is stirred for 8 minutes at the stirring speed of 75 revolutions per minute, and the mixture is subjected to ultrasonic oscillation for 7 minutes to finally form dry desulfurization ash slurry 9.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A wet desulphurization device of dry desulphurization ash is characterized in that: the device comprises a limestone bin (1), a conveyor belt (3), a limestone ball mill (4), a first slurry tank (5), a liquid inlet pipeline (6), a second slurry tank (7), a third slurry tank (8), a first liquid pump (10), a second liquid pump (11) and a wet desulphurization absorption tower (12); the feeding end of the conveying belt (3) is connected with the limestone silo (1), the discharging end of the conveying belt (3) is connected with the feeding end of the limestone ball mill (4), and limestone (2) in the limestone silo (1) is conveyed into the limestone ball mill (4) through the conveying belt (3); the discharge end of a limestone ball mill (4) is connected with the feed end of a first slurry tank (5), a liquid inlet pipeline (6) is connected with the liquid inlet end of the first slurry tank (5), clear water enters the first slurry tank (5) through the liquid inlet pipeline (6), the discharge end of the first slurry tank (5) is connected with the feed end of a second slurry tank (7), the discharge end of a third slurry tank (8) is connected with the feed end of the second slurry tank (7) through a first liquid pump (10), and dry desulfurization ash slurry (9) stored in the third slurry tank (8) is conveyed into the second slurry tank (7); the discharge end of the second slurry tank (7) is connected to the feed end of the wet desulphurization absorption tower (12) through a second liquid pump (11).
2. A desulfurization method using the wet desulfurization apparatus using the dry desulfurization ash of claim 1, characterized in that: the method comprises the following steps:
step 1: sending limestone (2) in the limestone silo (1) into a limestone ball mill (4) through a conveyor belt (3) for grinding;
step 2: conveying limestone ground by a limestone ball mill (4) into a first slurry tank (5);
and step 3: clear water is pumped into a first slurry tank (5) through a liquid pipeline (6) and is mixed with ground limestone to form limestone slurry;
and 4, step 4: limestone slurry flows into a second slurry tank (7) through a pipeline;
and 5: preparing dry desulfurization ash slurry (9) and storing the dry desulfurization ash slurry in a third slurry tank (8), pumping the dry desulfurization ash slurry (9) into a second slurry tank (7) through a first liquid pump (10), and mixing the limestone slurry with the dry desulfurization ash slurry (9) to form mixed desulfurization liquid;
step 6: the mixed desulfurization solution is pumped into a wet desulfurization absorption tower (12) through a second liquid pump (11) to carry out flue gas desulfurization.
3. The method for wet desulfurization of dry desulfurization ash according to claim 2, characterized in that: in the step 1, the feeding particle size of the limestone ball mill (4) is not more than 25mm, and the discharging particle size is 0.07-0.4 mm.
4. The method for wet desulfurization of dry desulfurization ash according to claim 2, characterized in that: in the step 3, the solid-to-liquid ratio of the ground limestone to the clear water is 1: 2-5.
5. The method for wet desulfurization of dry desulfurization ash according to claim 2, characterized in that: in the step 5, the volume ratio of the limestone slurry to the dry desulfurization ash slurry (9) is 10: 1-2.
6. The method for wet desulfurization of dry desulfurization ash according to claim 2, characterized in that: the preparation method of the dry desulfurization ash slurry (9) comprises the following steps:
step 5.1: preparing dry desulfurization ash from the desulfurization ash of the dry desulfurization device;
step 5.2: sieving the dry desulfurization ash to remove coarse particles;
step 5.3: selecting limestone with CaO content of 45.2-63.1% by mass, grinding the limestone by a ball mill, and sieving the ground limestone to remove coarse particles;
step 5.4: mixing the screened dry desulfurization ash and limestone to form mixed solid;
step 5.5: adding clear water into the mixed solid for mixing to form mixed slurry;
step 5.6: and adding calcium hydroxide and N-methyldiethanolamine into the mixed slurry, and stirring and shaking to form dry desulfurization ash slurry (9).
7. The method for wet desulfurization of dry desulfurization ash according to claim 6, characterized in that: the dry desulfurization ash comprises the following components in percentage by mass: CaO 25.3-49.2%, SiO28.8-27.6% of Fe2O31.3-15.2%, MgO 3.5-15.3%, and SO35.3-15.4% of Al2O32.3-18.1% and 0.75-6.9% of impurities.
8. The method for wet desulfurization of dry desulfurization ash according to claim 6, characterized in that: in the step 5.4, the solid-to-solid ratio of the dry desulfurization ash to the limestone is 8-12: 1.
9. The method for wet desulfurization of dry desulfurization ash according to claim 6, characterized in that: in the step 5.5, the solid-liquid ratio of the mixed solid to the clear water is 1: 2-3.
10. The method for wet desulfurization of dry desulfurization ash according to claim 6, characterized in that: in the step 5.6, 2 to 3 grams of calcium hydroxide and 0.03 to 0.08 gram of N-methyldiethanolamine are added per liter of the mixed slurry.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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