CN112933911B - Moving bed desulfurization system based on flue gas semidry desulfurization and application thereof - Google Patents
Moving bed desulfurization system based on flue gas semidry desulfurization and application thereof Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention relates to a semi-dry method based on smokeA moving bed desulfurization system for desulfurization and uses thereof, the system comprising: a moving bed adsorption device (2) for SO in the flue gas 2 Absorbing; a granular desulfurizer circulation loop for continuously supplying granular desulfurizer (4) to the moving bed adsorption device (2); a desulfurization slurry supply device for supplying desulfurization slurry to the moving bed adsorption device (2); one end of the moving bed adsorption device (2) is provided with a flue gas inlet (1), and the other end is provided with a flue gas outlet (5). Compared with the prior art, the method has the advantages that the wet method and the semi-dry method desulfurization process are effectively combined, the desulfurization efficiency of the flue gas is improved, the generation of desulfurization waste water is reduced, the reduction of the temperature of the flue gas is less, a foundation is provided for the application of the subsequent low-temperature flue gas denitration technology, and the like.
Description
Technical Field
The invention relates to the technical field of flue gas gaseous pollutant adsorption removal, in particular to a moving bed desulfurization system based on flue gas semidry desulfurization and application thereof.
Background
The air pollution control technology mainly comprises absorption, adsorption, catalysis and the like. For sulfur oxides in flue gases, absorption and adsorption processes are conventionally employed. The wet desulphurization method mainly based on absorption has high efficiency and mature technology, and is applied to most industrial flue gas desulphurization projects. However, the wet desulphurization process brings about the problem of desulphurization wastewater treatment, and the process water consumption is large, so that the process cannot be applied to occasions requiring dry desulphurization. The efficiency of dry desulphurization is relatively low, and the control requirement of ultralow emission of flue gas in the current main industrial industry cannot be met.
The semi-dry desulfurization technique is to spray wet desulfurizing agent into flue gas to remove SO 2 A desulfurization method for carrying out absorption. The method has the characteristic of high reaction speed of the wet desulphurization process, has the advantage of no wastewater discharge in the dry desulphurization process, and is an important process and development direction for flue gas desulphurization. However, compared with wet desulphurization, the semi-dry desulphurization technology still has the disadvantages of low efficiency, low utilization rate of the desulfurizer and operationThe elasticity is small. If the semi-dry desulfurization equipment can be improved, the desulfurization efficiency and the utilization rate of the desulfurizer are improved, and the popularization and the application of the equipment are promoted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a moving bed desulfurization system based on flue gas semi-dry desulfurization and application thereof, wherein the moving bed desulfurization system effectively combines a wet method and a semi-dry desulfurization process, improves the desulfurization efficiency of flue gas, reduces the generation of desulfurization waste water, reduces the temperature of the flue gas less, and provides a basis for the application of a subsequent low-temperature flue gas denitration technology.
The purpose of the invention can be realized by the following technical scheme:
a moving bed desulfurization system based on flue gas semidry desulfurization, the system comprises:
moving bed adsorption device for SO in flue gas 2 Absorbing;
a granular desulfurizer circulation loop for continuously supplying granular desulfurizer to the moving bed adsorption device;
a desulfurization slurry supply device for supplying desulfurization slurry to the moving bed adsorption device;
one end of the moving bed adsorption device is provided with a flue gas inlet, and the other end of the moving bed adsorption device is provided with a flue gas outlet.
Further, the particle desulfurizer circulating loop comprises a plurality of circulating loops which are connected in sequence,
a moving bed adsorption device is arranged on the bed,
the vibrating screen conveying device is used for separating and discharging fine desulfurizer powder generated by abrasion in the flue gas desulfurization process; a desulfurization product separation outlet is also arranged below the vibrating screen conveying device;
the particle adsorbent lifting device is used for lifting the height of the residual particle desulfurizer separated by the vibrating screen conveying device;
and the particle adsorbent conveying pipe is used for adding the highly-lifted particle desulfurizer into the moving bed adsorption device for cyclic utilization.
The diameter of the particulate adsorbent is increased, the specific surface area in the moving bed is reduced, the contact area between the flue gas and the adsorbent particles is reduced, the removal efficiency of sulfur dioxide in the flue gas is reduced in the same retention time, and otherwise, the desulfurization efficiency is increased. However, if the diameter of the granular adsorbent is smaller, the bulk density of the adsorbent per unit volume is increased, which results in increased resistance of the flue gas passing through the moving bed, and thus the required wind pressure is increased, the power of the fan is increased, and the one-time investment and the operation energy consumption are correspondingly increased.
If the abraded particulate sorbent is not extracted, then the following three negative effects are expected: 1. since the partially worn adsorbent itself does not have desulfurization performance after multiple rounds of adsorption, the desulfurization efficiency of the whole equipment is reduced; 2. if the desulfurization product is not extracted, the desulfurization product cannot be recovered and the adsorbent cannot be regenerated, so that the operation cost is increased; 3. the worn adsorbent has very small particle size and is easy to block a gas channel in the moving bed, and if the adsorbent is not pumped out in time, the pressure loss of equipment is increased sharply. That is, it is necessary to constantly remove a portion of the milled particulate sorbent to avoid this.
Furthermore, a sieve pore support inclined plate is arranged in the moving bed adsorption device and is used for bearing the granular desulfurizer and introducing the used granular desulfurizer in the flue gas desulfurization process into a granular desulfurizer circulation loop.
Furthermore, the inclined angle between the inclined supporting plates of the sieve pores and the horizontal direction is 30-40 degrees, the size of the sieve pores is 2-3mm, and the opening rate is 20-60 percent.
Furthermore, a guide pipe which is convenient for the granular adsorbent to move to the vibrating screen conveying device is arranged between the moving bed adsorption device and the vibrating screen conveying device. The angle between the draft tube and the horizontal direction is about 40 degrees, and the diameter is about 100mm.
Further, the desulfurization slurry supply device comprises:
the desulfurization slurry configurator is used for configuring and storing desulfurization slurry;
a desulfurization slurry sprayer for spraying desulfurization slurry onto the particulate desulfurization agent;
furthermore, the height of the moving bed in the moving bed adsorption device is 500-3000mm.
Further, the system is also provided with a feed inlet for supplementing fresh granular desulfurizer to the system.
Furthermore, a dust removal device is arranged at the smoke outlet.
Application of moving bed desulfurization system based on flue gas semidry desulfurization, which is applied to SO in flue gas 2 And (4) removing.
The method for purifying the flue gas comprises the following steps that the initial temperature of the flue gas is 100-150 ℃, and SO is 2 The initial concentration was 500mg/Nm 3 Left and right:
in the process, the main function is to spray the absorption liquid film formed on the surface of the particulate matter, and the particulate matter adsorbent plays a role of a filler more, so the moving speed of the particulate matter adsorbent has little influence on the desulfurization efficiency. And when the flue gas temperature is lower, the desulfurization efficiency of the absorbent is higher, but insufficient heat can cause liquid accumulation in the desulfurization tower, and the design that the upper part is wet and the lower part is dry cannot be realized, so that the flue gas temperature is more proper at 100-150 ℃, and the flow of the spraying liquid and the concentration of the absorption liquid can be adjusted according to the flue gas temperature, so as to ensure the smooth implementation of the process.
The first step, the particle adsorbent is conveyed from a particle adsorbent conveying pipe to a moving bed adsorption device, and a certain amount of desulfurization slurry is sprayed on the surface of the particle adsorbent by a desulfurization slurry supply device to form an absorption liquid film; the flue gas enters the moving bed adsorption device from the bottom flue gas inlet and forms high-efficiency gas-solid-liquid contact with the particle adsorbent, SO that high-efficiency SO removal is realized 2 When gaseous pollutants are absorbed/adsorbed, the particle adsorbent is discharged from the bottom flow guide pipe; wherein the particle adsorbent is about 5-8mm in diameter and can be one or more of magnesium oxide, calcium oxide or aluminum oxide; the mass concentration of the desulfurization absorption liquid is 1-20%, and the solute can be one or more of sodium hydroxide, sodium oxide, sodium carbonate, sodium bicarbonate, magnesium hydroxide, magnesium oxide, magnesium carbonate, calcium hydroxide, calcium oxide or calcium carbonate; filtering of flue gas through particulate moving bedThe speed is 0.5-2.0m/min; the liquid-gas ratio of the spraying amount of the desulfurization absorption liquid to the flue gas amount is 1-5L/m 3 The ratio of the conveying capacity of the granular desulfurizer to the flue gas capacity is 1-20g/m 3 ；
Secondly, the flue gas passes through a granular adsorbent moving bed on a sieve pore support inclined plate, is firstly adsorbed by dried granular adsorbent and desulfurizer powder generated by abrasion of the dried granular adsorbent, and then is absorbed by a desulfurizer liquid film on the surface of the undried granular adsorbent in the continuous upward process, so that the desulfurization efficiency is further improved;
and thirdly, the granular adsorbent moving from top to bottom flows out of the moving bed adsorption device along the inclined sieve pore support inclined plate, the fine powder of the desulfurization product is separated by the vibrating sieve conveying device, and then is lifted to the granular adsorbent conveying pipe at the upper part from bottom to top by the granular adsorbent lifting device, so that the flue gas pollutants are subjected to cyclic adsorption treatment.
Compared with the prior art, the invention has the following advantages:
(1) The invention effectively combines the concepts of the moving bed and the packed tower, and not only utilizes the desulfurizing agent liquid film formed on the surface of the granular adsorbent to treat SO in the flue gas 2 The high-efficiency adsorption is carried out, and the wet desulphurization efficiency close to that of a packed tower can be achieved;
(2) The particle adsorbent used in the invention is dried after being removed with hot flue gas in the downward moving process, and desulfurizer powder generated in the abrasion process of the dried particle adsorbent can continuously react with SO 2 The deep removal is carried out, so that the removal efficiency of gaseous pollutants is improved, and the utilization rate of a desulfurizer is improved;
(3) The particle adsorbent used in the invention is led out of the adsorption tower through the flow guide pipe, and the desulfurization product attached to the particle adsorbent can be removed, separated and recovered through the vibrating screen transmission device, and then the particle adsorbent is thrown to the top of the adsorption tower again through the lifting and conveying device, so that the flue gas pollutants can be adsorbed circularly, and the utilization efficiency of the particle adsorbent is improved;
(4) The invention is suitable for the requirements of dry-type capturing and purifying treatment of gaseous pollutants in various industrial flue gases of coal burning, industrial boilers, metal smelting, cement production, petrochemical industry, waste incineration and the like.
Drawings
FIG. 1 is a schematic view of an apparatus according to an embodiment;
the reference numbers in the figures indicate: the device comprises a flue gas inlet 1, a moving bed adsorption device 2, a sieve mesh supporting inclined plate 3, a granular desulfurizer 4, a flue gas outlet 5, a granular adsorbent conveying pipe 6, a desulfurization slurry configurator 7, a desulfurization slurry sprayer 8, a granular adsorbent lifting device 9, a vibrating screen conveying device 10 and a desulfurization product separation outlet 11.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
A moving bed desulfurization system based on semidry flue gas desulfurization, referring to fig. 1, the system comprising: a moving bed adsorption device 2 for SO in the flue gas 2 Absorbing; a granular desulfurizing agent circulation circuit for continuously supplying a granular desulfurizing agent 4 to the moving bed adsorption apparatus 2; a desulfurization slurry supply device for supplying desulfurization slurry to the moving bed adsorption device 2; a flue gas inlet 1 is arranged at one end of the moving bed adsorption device 2, and a flue gas outlet 5 is arranged at the other end. The desulfurization slurry supply device comprises: a desulfurization slurry configurator 7 for configuring and storing desulfurization slurry; and a desulfurization slurry sprayer 8 for spraying the desulfurization slurry onto the particulate desulfurization agent. The height of the moving bed in the moving bed adsorption device 2 is 500-3000mm. The system is also provided with a feeding port for supplementing fresh granular desulfurizer to the system. And a dust removal device is arranged at the flue gas outlet 5. The height of the moving bed means the distance from the lowermost part of the adsorbent outlet of the main absorption column to the upper part of the whole moving bed adsorption unit 2. If the distance is high, the used adsorbent amount is large, the flue gas treatment effect is good, but the pressure loss is large; otherwise, the adsorbent is used in a small amount, the treatment effect is poor, and the pressure loss is small.
The particle desulfurizer circulation loop comprises a moving bed adsorption device 2 and a vibrating screen conveying device 10 which are connected in sequence and used for separating and discharging fine desulfurizer powder generated by abrasion in the flue gas desulfurization process; a desulfurization product separation outlet 11 is also arranged below the vibrating screen conveying device 10; the particle adsorbent lifting device 9 is used for lifting the height of the residual particle desulfurizer separated by the vibrating screen conveying device 10; and the particle adsorbent conveying pipe 6 is used for adding the highly-lifted particle desulfurizer into the moving bed adsorption device 2 for cyclic utilization. A guide pipe which is convenient for the granular adsorbent to move to the vibrating screen conveying device 10 is arranged between the moving bed adsorption device 2 and the vibrating screen conveying device 10. The angle between the draft tube and the horizontal direction is about 40 degrees, and the diameter is about 100mm.
The moving bed adsorption device 2 is provided with a sieve pore support inclined plate 3 for bearing a granular desulfurizer 4 and introducing the used granular desulfurizer in the flue gas desulfurization process into a granular desulfurizer circulation loop. The inclined angle between the inclined supporting plate 3 of the sieve pores and the horizontal direction is 30-40 degrees, the size of the sieve pores is 2-3mm, and the opening rate is 20-60 percent.
Application of moving bed desulfurization system based on flue gas semidry desulfurization, which is applied to SO in flue gas 2 And (4) removing.
The method for purifying the flue gas comprises the following steps that the initial temperature of the flue gas is 100-150 ℃, and SO 2 The initial concentration was 500mg/Nm 3 Left and right:
a first step of transporting the particulate adsorbent 4 from the particulate adsorbent transport pipe 6 to the moving bed adsorption apparatus 2 while spraying a predetermined amount of desulfurization slurry onto the surface of the particulate adsorbent by means of the desulfurization slurry supply apparatus to form an absorption liquid film; the flue gas enters the moving bed adsorption device 2 from the bottom flue gas inlet 1 and forms high-efficiency gas-solid-liquid contact with the particle adsorbent 4, SO that high-efficiency SO removal is realized 2 When gaseous pollutants are absorbed/adsorbed, the particle adsorbent is discharged from the bottom flow guide pipe; wherein the particle adsorbent is about 5-8mm in diameter and can be one or more of magnesium oxide, calcium oxide or aluminum oxide; the mass concentration of the desulfurization absorption liquid is 1-20%, and the solute can be one or more of sodium hydroxide, sodium oxide, sodium carbonate, sodium bicarbonate, magnesium hydroxide, magnesium oxide, magnesium carbonate, calcium hydroxide, calcium oxide or calcium carbonate; the filtering speed of the flue gas passing through the particle moving bed is 0.5-2.0m/min; the filtering speed of the flue gas in the moving bed layer is 2m/s, and the liquid-gas ratio of the spraying amount of the desulfurization absorption liquid to the flue gas amount is 1-5L/m 3 The ratio of the conveying capacity of the granular desulfurizer to the flue gas capacity is 1-20g/m 3 ；
Secondly, the flue gas passes through a granular adsorbent moving bed on a sieve pore support inclined plate 3, is firstly adsorbed by dried granular adsorbent and desulfurizer powder generated by abrasion of the dried granular adsorbent, and then is absorbed by a desulfurizer liquid film on the surface of the undried granular adsorbent in the continuous upward process, so that the desulfurization efficiency is further improved;
thirdly, the granular adsorbent 4 moving from top to bottom flows out of the moving bed adsorption device 2 along the inclined sieve pore supporting inclined plate 3, fine powder of the desulfurization product is separated through the vibrating sieve conveying device 10, and then is lifted from bottom to the upper granular adsorbent conveying pipe 6 through the granular adsorbent lifting device 9, so that the flue gas pollutants are subjected to circulating adsorption treatment.
Example 1
As shown in fig. 1, a moving bed desulfurization system based on flue gas semidry desulfurization mainly comprises a moving bed adsorption device 2, a sieve pore support inclined plate 3, a granular adsorbent conveying pipe 6, a desulfurization slurry distributor 7, a desulfurization slurry sprayer 8, a granular adsorbent lifting device 9, a vibrating screen conveying device 10 and other key components. Wherein, the inclined angle of the inclined supporting sieve plate and the horizontal direction is 40 degrees, the size of the sieve pore is 3mm, and the aperture ratio is 60 percent. The granular adsorbent is led out of the moving bed adsorption device 2 through a draft tube with the diameter of 100mm, and the included angle between the draft tube and the horizontal direction is 40 degrees, so that the granular adsorbent can move conveniently. The granular adsorbent used in this example was alumina adsorption pellets having a diameter of 5 mm. The alumina adsorption pellets move downwards along the inclined support sieve plate from top to bottom, and the height of the moving bed adsorption device 2 is 500mm. The desulfurization slurry adopts 5 percent sodium carbonate solution and is sprayed on the surface of the granular adsorbent according to a certain liquid-gas ratio.
The simulated industrial flue gas is provided by calcining pulverized coal in a rotary kiln, and the flue gas volume is 100Nm 3 H is used as the reference value. And (3) introducing the flue gas at the outlet of the rotary kiln into the moving bed desulfurization system after passing through the cooling device, and finally introducing the flue gas into subsequent deep flue gas purification equipment through the induced draft fan. The temperature of the flue gas at the outlet of the cooling device downstream of the rotary kiln was maintained at 150 ℃ and SO 2 The concentration is 500mg/Nm 3 The height of the moving bed is 1000mm. The moving speed of the granular adsorbent in the moving bed is 5mm/s. The liquid-gas ratio of the spraying amount of the desulfurization slurry to the simulated flue gas is 1.5L/m 3 . After passing through the composite adsorption reaction device of the invention, SO 2 The concentration is 25mg/Nm 3 ，SO 2 The removal efficiency was about 95%.
Example 2
The difference from the example 1 is that the liquid-gas ratio of the spraying amount of the desulfurization slurry to the simulated flue gas is 2.5L/m 3 . After passing through the composite adsorption reaction device of the invention, SO 2 The concentration is 16mg/Nm 3 ，SO 2 The removal efficiency was about 97%.
Comparative example 1
The difference from example 1 is that the apparatus eliminates the granular desulfurizing agent circulation loop, i.e. the abraded granular adsorbent and the final SO cannot be removed 2 The removal efficiency is less than 70%.
Comparative example 2
The difference from example 1 is that the diameter of the particulate adsorbent is about 1mm and the final SO 2 The removal efficiency is less than 80%. And the wind pressure can be increased, the power of the fan is increased, and the one-time investment and the operation energy consumption of the fan are correspondingly increased.
Comparative example 3
The difference from example 1 is that the diameter of the particulate adsorbent is about 20mm and the final SO 2 The removal efficiency is less than 70%.
Comparative example 4
The difference from example 1 is that the flue gas temperature at the outlet of the cooling device downstream of the rotary kiln was kept around 200 ℃, which is too close to dry desulfurization, inefficient and the final SO 2 The removal efficiency is less than 80%.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A moving bed desulfurization system based on flue gas semidry desulfurization is characterized by comprising:
a moving bed adsorption device (2) for SO in the flue gas 2 Absorbing;
a granular desulfurizer circulation loop for continuously supplying granular desulfurizer (4) to the moving bed adsorption device (2); the diameter of the granular desulfurizing agent (4) is 5-8 mm;
the particle desulfurizer circulating loop comprises a plurality of circulating pipes which are connected in sequence,
a moving bed adsorption device (2),
the vibrating screen conveying device (10) is used for separating and discharging fine desulfurizer powder generated by abrasion in the flue gas desulfurization process;
the particle adsorbent lifting device (9) is used for lifting the height of the residual particle desulfurizer separated by the vibrating screen conveying device (10);
the particle adsorbent conveying pipe (6) is used for adding the highly-lifted particle desulfurizer (4) into the moving bed adsorption device (2) for cyclic utilization;
a desulfurization slurry supply device for supplying desulfurization slurry to the moving bed adsorption device (2);
one end of the moving bed adsorption device (2) is provided with a flue gas inlet (1), and the other end is provided with a flue gas outlet (5).
2. The moving bed desulfurization system based on flue gas desulfurization by semidry process as claimed in claim 1, characterized in that said moving bed adsorption unit (2) is equipped with sieve pore support inclined plate (3) for carrying granular desulfurizing agent (4) and introducing the used granular desulfurizing agent into the circulating loop of the granular desulfurizing agent.
3. The moving bed desulfurization system based on flue gas semidry desulfurization according to claim 2, characterized in that the inclined angle of the inclined support plate (3) of the sieve holes with respect to the horizontal direction is 30-40 °, the size of the sieve holes is 2-3mm, and the opening ratio is 20-60%.
4. The moving bed desulfurization system based on flue gas semi-dry desulfurization according to claim 1, characterized in that a flow guide pipe for moving the granular desulfurizing agent (4) to the vibrating screen conveyor (10) is arranged between the moving bed adsorption device (2) and the vibrating screen conveyor (10).
5. The moving bed desulfurization system based on semidry desulfurization of flue gas as set forth in claim 1, wherein said desulfurization slurry supply means comprises:
a desulfurization slurry configurator (7) for configuring and storing desulfurization slurry;
and a desulfurization slurry sprayer (8) for spraying the desulfurization slurry onto the particulate desulfurization agent.
6. The moving bed desulfurization system based on flue gas semidry desulfurization according to claim 1, characterized in that the moving bed height of the moving bed adsorption device (2) is 500-3000mm.
7. The moving bed desulfurization system based on semidry flue gas desulfurization according to claim 1, characterized in that the system is further provided with a feed port for supplementing fresh granular desulfurizing agent into the system.
8. The moving bed desulfurization system based on flue gas semidry desulfurization according to claim 1, characterized in that a dust removal device is provided at the flue gas outlet (5).
9. Use of the moving bed desulfurization system based on flue gas semidry desulfurization according to any one of claims 1 to 8, characterized in that the system is applied to SO in flue gas 2 Is removed from。
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| CN106731585B (en) * | 2017-02-27 | 2023-03-28 | 福建龙净脱硫脱硝工程有限公司 | Coke oven flue gas dry-type desulfurization device, coke oven flue gas dry-type desulfurization and dust removal integrated system and method |
| CN111729504A (en) * | 2020-06-10 | 2020-10-02 | 上海交通大学 | Fluidized bed and moving bed coupled composite adsorption reaction device and application |
| CN111773915B (en) * | 2020-06-10 | 2022-07-15 | 上海交通大学 | Flue gas dry desulfurization process |
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