CN112337292A - Sulfonation removal initiator for sulfur trioxide in coal-fired flue gas and application thereof - Google Patents
Sulfonation removal initiator for sulfur trioxide in coal-fired flue gas and application thereof Download PDFInfo
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- CN112337292A CN112337292A CN202011166724.5A CN202011166724A CN112337292A CN 112337292 A CN112337292 A CN 112337292A CN 202011166724 A CN202011166724 A CN 202011166724A CN 112337292 A CN112337292 A CN 112337292A
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- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 238000006277 sulfonation reaction Methods 0.000 title claims abstract description 62
- 239000003999 initiator Substances 0.000 title claims abstract description 60
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 150000001875 compounds Chemical class 0.000 claims abstract description 29
- 239000004094 surface-active agent Substances 0.000 claims abstract description 19
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- 239000000654 additive Substances 0.000 claims abstract description 16
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- 239000002245 particle Substances 0.000 claims description 25
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- 238000006243 chemical reaction Methods 0.000 claims description 10
- 229920003169 water-soluble polymer Polymers 0.000 claims description 8
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- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- LUEWUZLMQUOBSB-FSKGGBMCSA-N (2s,3s,4s,5s,6r)-2-[(2r,3s,4r,5r,6s)-6-[(2r,3s,4r,5s,6s)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2r,4r,5s,6r)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol Chemical compound O[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O[C@@H]2[C@H](O[C@@H](OC3[C@H](O[C@@H](O)[C@@H](O)[C@H]3O)CO)[C@@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O LUEWUZLMQUOBSB-FSKGGBMCSA-N 0.000 claims description 4
- 229920002581 Glucomannan Polymers 0.000 claims description 4
- 229940046240 glucomannan Drugs 0.000 claims description 4
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- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 claims description 3
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- ZPIRTVJRHUMMOI-UHFFFAOYSA-N octoxybenzene Chemical compound CCCCCCCCOC1=CC=CC=C1 ZPIRTVJRHUMMOI-UHFFFAOYSA-N 0.000 claims description 3
- 229940068041 phytic acid Drugs 0.000 claims description 3
- 235000002949 phytic acid Nutrition 0.000 claims description 3
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- 230000000694 effects Effects 0.000 abstract description 19
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- 238000003786 synthesis reaction Methods 0.000 abstract description 2
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- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
-
- 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
- B01D53/507—Sulfur oxides by treating the gases with other liquids
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the field of energy and environment, and particularly relates to a sulfonation removal initiator for sulfur trioxide in coal-fired flue gas and application thereof. The sulfonation removal initiator comprises the following components in percentage by mass: 0.05-0.1% of surfactant, 0.05-0.1% of water-soluble high molecular compound, 0.005-0.02% of additive and the balance of water, wherein the water-soluble high molecular compound can perform sulfonation reaction with sulfur trioxide to generate an organic sulfonate high molecular compound. The sulfonation removal initiator is efficient, safe and cheap, the synthesis process is simple, the operation is easy, the environment is not polluted, and the sulfur trioxide removal effect is obvious.
Description
Technical Field
The invention belongs to the field of energy and environment, and particularly relates to a sulfonation removal initiator for sulfur trioxide in coal-fired flue gas and application thereof.
Background
At present, China takes strict emission-limiting measures on main pollutants of coal-fired power plantsGreat results are obtained, such as smoke, NOx and SO2And the emission is effectively controlled, and the ultra-low emission standard is achieved. SO of former coal-fired power plant3The concentration is low, and the attention of the public is not drawn. Due to the comprehensive popularization and application of ultralow emission modification in the year, a large number of SCR denitration systems are installed and SCR catalysts are used, SO that partial SO is generated2By oxidation to SO3To make SO in the flue gas3The concentration increases. SO in flue gas3Harm far greater than SO2And the corrosion to power plant equipment threatens the safe operation of the power plant, and the acid rain is formed and the haze is aggravated when the acid rain is discharged into the atmosphere. SO in flue gas of coal-fired power plant3The difficulty of removal is that SO is reduced along with the reduction of the temperature of the flue gas3The sulfuric acid mist exists in the form of micro-droplets, the particle size is micron-sized, and the existing equipment of a power plant is difficult to remove. Frequent colored smoke plume and blockage of an air preheater are urgently solved, and an economical and efficient sulfur trioxide control method needs to be developed.
CN101513583B discloses a chemical agglomeration accelerant for coal-fired ultrafine particles, which comprises a surfactant, a water-soluble macromolecular compound, a pH regulator, an additive and water. The surfactant promotes the wetting of the ultrafine particles by reducing the surface tension of the solution, and accelerates the ultrafine particles to enter the inside of the liquid drops of the agglomeration promoter, so that the capture speed and the capture amount of the agglomeration promoter on the ultrafine particles are improved. After the sodium-based surfactant is adsorbed by the particles, the conductivity of the particles can be enhanced, and the specific resistance of the particles is reduced. After the water-soluble high molecular compound is dissolved in water, the formed charged groups can generate electric neutralization with ultrafine particles; the long polymer chains adsorbed on the surfaces of the particles may be adsorbed on the surface of another particle at the same time, two or more particles are agglomerated together in a bridging manner, and both the electrical neutralization and the adsorption bridging effect can cause the agglomeration of the particles. The pH regulator can change the existing form of a water-soluble macromolecular compound molecular chain in a solution, so that a curled or rigidly stretched molecular chain is softened into a flexibly stretched molecular chain, the particle agglomeration capability of the molecular chain is enhanced, and the agglomeration efficiency of the agglomeration promoter on ultrafine particles is further improved. The additive can enhance the capability of the surfactant for reducing the surface tension of the solution and promote the wetting of ultrafine particles; adding simultaneouslyThe additive can also enhance the conductivity of particles, reduce the specific resistance of the particles and improve the removal efficiency of the electrostatic dust collector on the fly ash with high specific resistance. Although the technical proposal provides the utilization of agglomeration technology to treat fly ash in coal-fired power plants, the technical proposal does not solve SO existing in coal-fired3A gas.
In conclusion, the prior art still lacks a method which can solve the defects of the SCR catalyst and effectively remove the acid mist of the coal-fired sulfur trioxide.
Disclosure of Invention
The invention aims to provide a high-temperature sulfonation removal initiator for sulfur trioxide in coal-fired flue gas, which can effectively remove acid mist of coal-fired sulfur trioxide and prevent NH4HSO4And the air preheater is blocked, so that the normal operation of the unit is influenced.
As a first aspect of the invention, a sulfonation removal initiator for protecting sulfur trioxide in coal-fired flue gas comprises the following components in percentage by mass: 0.05-0.1% of surfactant, 0.05-0.1% of water-soluble high molecular compound, 0.005-0.02% of additive and the balance of water, wherein the water-soluble high molecular compound can perform sulfonation reaction with sulfur trioxide to generate an organic sulfonate high molecular compound.
Aiming at flue gas SO caused by coal combustion and SCR catalytic oxidation3The concentration is increased to initiate colored smoke plume, and SO is utilized3High-temperature sulfonation technology for removing more than 70 percent of SO3Content, cut off (NH)4)2SO4、NH4HSO4And (3) waiting for the formation condition of ammonium sulfate salt, and reducing the blockage probability of the air preheater. Based on the chemical agglomeration technology, high-temperature sulfonated SO is developed3Removing initiator and promoting SO3Carrying out sulfonation reaction with organic polymer to convert into organic sulfonate compound, and establishing sulfonation reaction to remove SO in flue gas3A method.
SO with strong oxidizing property3And carrying out sulfonation reaction with an organic substance capable of providing an electronic group, wherein the sulfonation reaction belongs to a typical electrophilic substitution reaction. The temperature of the flue gas before the air preheater is within the range of 300-400 ℃, the sulfonation reaction speed is high, the reaction activity is high, and the method belongs to an exothermic reaction. The specific reaction is as follows:
Ar－H+SO3→Ar－SO3H
SO water-soluble high molecular compound and SO in the initiator are removed by sulfonation3The sulfonation reaction is carried out to generate an organic sulfonate high molecular compound, and the initiator has various surface activities of water solubility, emulsification, wetting and the like, so that the removal effect of the initiator is further promoted.
Preferably, the water-soluble polymer compound is any one of glucomannan and xanthan gum.
Preferably, the surfactant is any one of cetyltrimethylammonium chloride and polyethylene glycol octyl phenyl ether.
Preferably, the additive is any one of potassium chloride and phytic acid.
As a second aspect of the present invention, a method for preparing the sulfonation removal initiator is provided, wherein a water-soluble polymer compound is added to water and stirred uniformly, after completely dissolving, a surfactant and an additive are added, and finally, stirring is performed until completely dissolving.
As a third aspect of the invention, the use of said sulphonation removal initiator is protected, characterized in that said use comprises a process for sulphur trioxide removal.
Preferably, the sulfonation removal initiator is atomized to form liquid drops, and the liquid drops are sprayed into a flue in front of an air preheater to capture sulfur trioxide so as to remove the sulfur trioxide.
Preferably, the droplets have a particle size of not more than 100 μm, and preferably, the droplets are 25 μm to 50 μm. The spray gun is provided with a novel self-developed two-fluid materialization nozzle, the average particle size of liquid drops is mainly measured by using a Winner318A type spray laser particle size analyzer, and the particle size of the liquid drops can meet the requirement.
Preferably, the ratio of the input amount of the sulfonation stripping initiator to the mass of sulfur trioxide is not less than 10:1, preferably (10-50): 1.
Preferably, the temperature of the reaction of the sulfonation removal initiator and sulfur trioxide is 300-400 ℃.
The invention has the following beneficial effects:
(1) the sulfonation desorption initiator used in the invention comprises a surfactant, a water-soluble high molecular compound, an additive and water, and has a synergistic cooperation effect, the surfactant can reduce the surface tension of an initiator solution, promote wetting of fine particulate matters and accelerate adsorption of sulfur trioxide acid mist on the particulate matters, so that the trapping speed and trapping amount of the sulfonation desorption initiator on sulfur trioxide are improved, after the high molecular compound is dissolved in water, the gel strength and solution viscosity of the high molecular compound are increased, linear molecules of a high polymer are wound to form a net structure under various bridge forces to form stable gel, and molecular chains of the polymer occupy adsorption sites on the surfaces of the fine particulate matters to agglomerate with the fine particulate matters to form agglomerates. The complex formulation of various macromolecular compounds can form elastic movable chains, and an elastic compact network structure is formed between chains, so that the trapping probability of sulfur trioxide acid mist is increased. The addition of the additive increases the collision probability of the sulfur trioxide acid mist and the fine particles, can also enhance the conductivity and intermolecular force of the high polymer, and reduces the specific resistance of the fine particles.
(2) The sulfonation removal initiator is efficient, safe and cheap, has a simple synthesis process, is easy to operate, has no pollution to the environment, has an obvious sulfur trioxide removal effect, can greatly reduce the emission of sulfur trioxide of a coal-fired power plant, and can also remove fine particles and heavy metals due to the fact that most of sulfur trioxide acid mist is enriched on the fine particles.
(3) When the sulfonation desorption initiator is used for removing sulfur trioxide, the particle size of the liquid drops is 25-50 microns, the liquid drops can fully contact sulfur trioxide acid mist and fine particles in flue gas, a good desorption effect is achieved, the input amount of the sulfonation desorption initiator and the mass ratio of sulfur trioxide are proper, the desorption effect is guaranteed, and the influence of incomplete evaporation liquid drops escaping on subsequent equipment is avoided.
(4) The invention creates an advanced energy-saving and environment-friendly new way of using high-temperature flue gas to treat wastes with processes of wastes against one another in front of the air preheater, compared with the conventional application, the air preheater is used as preheating equipment for improving the heat exchange performance of a boiler and reducing energy loss, when the air preheater is seriously blocked,the load limitation of the boiler can be caused, even the boiler is shut down for maintenance, and the normal operation of the unit is influenced. The method is used for treating SO in flue gas by spraying a sulfonation removal initiator in front of an air preheater3Cutting off (NH)4)2SO4、NH4HSO4And the formation conditions of ammonium sulfate salt are equal, the blocking probability of the air preheater is reduced, the problem that the pressure difference of the air preheater continuously runs by a unit is continuously increased is solved, and a better effect is achieved.
(5) The sulfonation initiator removal of the invention is fundamentally to SO3Effectively removes the colored smoke plume, solves the fundamental problem of the colored smoke plume of the power plant, and fills the SO of the coal-fired power plant from multiple dimensions such as operation stability, energy conservation and consumption reduction3Blank of treatment.
Drawings
FIG. 1 is a process flow diagram of a method of use of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides an initiator for removing sulfur trioxide from coal-fired flue gas through high-temperature sulfonation, which is characterized by comprising the following components in percentage by mass: 0.05-0.1% of surfactant, 0.05-0.1% of water-soluble high molecular compound, 0.005-0.02% of additive and the balance of water, wherein the water-soluble high molecular compound can perform sulfonation reaction with sulfur trioxide to generate an organic sulfonate high molecular compound.
The water soluble polymer can be selected from glucomannan and xanthan gum. The surfactant is any one of hexadecyl trimethyl ammonium chloride and polyethylene glycol octyl phenyl ether. The additive is potassium chloride and phytic acid.
The invention also provides a method for preparing the sulfonation removal initiator, which comprises the following steps: adding a water-soluble high molecular compound into water, uniformly stirring, adding a surfactant and an additive after the water-soluble high molecular compound is completely dissolved, and finally stirring until the water-soluble high molecular compound is completely dissolved to obtain the sulfonation removal initiator.
As shown in fig. 1, the present invention also provides a method for using the above sulfonation removal initiator for sulfur trioxide removal, which specifically comprises: and atomizing the sulfonation removal initiator into liquid drops, and then spraying the liquid drops into a flue in front of an air preheater to capture sulfur trioxide generated by coal combustion or sulfur trioxide generated after SCR catalytic oxidation after coal combustion, thereby removing the sulfur trioxide.
Different components in the raw materials can be independently stored before use, and the sulfonation removal initiator is obtained by proportioning according to the proportion when the sulfonated polymeric material is used; or preparing the high-concentration solution according to a proportion for storage, and adding industrial water for dilution according to a proportion to obtain the sulfonation removal initiator when the sulfonation removal initiator is used, but the prepared high-concentration solution is not suitable for long-term storage, preferably for one week. The mass ratio of the input amount of the sulfonation desorption initiator to the sulfur trioxide is not less than 10:1, preferably (10-50):1, so that the desorption effect is ensured, and the influence of the escape of incompletely evaporated droplets on subsequent equipment is avoided. Further, the particle size of the liquid drops is preferably less than 100 μm, and is further preferably 25 μm to 50 μm, and the liquid drops with the particle size in the range can fully contact sulfur trioxide acid mist and fine particulate matters in the flue gas, so that a good removing effect is realized.
The present invention will be described in detail below with reference to specific examples, wherein the percentages are by mass.
Example 1
The embodiment provides a sulfonation removal initiator, which comprises 0.05% of glucomannan, 0.1% of hexadecyl trimethyl ammonium chloride, 0.02% of potassium chloride and the balance of water according to the formula proportion;
the method comprises the steps of mixing four-electric-field fly ash of an electrostatic precipitator of a certain power plant with preheated air to serve as simulated flue gas, introducing the simulated flue gas into a reaction chamber, atomizing the sulfonation removal initiator into liquid drops with the average particle size of 50 mu m under the action of compressed air (0.5MPa), wherein the mixed flue gas amount is 2200ml/min, the initiator adding amount is 5ml/min, the concentration of sulfur trioxide is 114ppm by measuring the content of sulfur trioxide in the flue gas, the mass ratio of the initiator to the sulfur trioxide is 20:1, the four-electric-field fly ash and the preheated air interact in the simulated flue environment in the reaction chamber, the residence time is 2s, and the reaction temperature is 350 ℃. The sulfur trioxide concentration was measured by ion chromatography using an EPA 80% isopropanol absorption method to collect sulfur trioxide in the flue gas.
And the sulfonation removal initiator promotes the agglomeration and growth of sulfur trioxide acid mist and fine particles, and then the sulfur trioxide acid mist and the fine particles are captured by a subsequent bag-type dust remover, the bag adopts a conventional chemical fiber filter material, and sulfur trioxide sampling is carried out at the rear outlet of the bag-type dust remover by adopting an EPA method to determine the emission concentration of sulfur trioxide. Test results show that the emission concentration of sulfur trioxide after the sulfonation removal initiator is sprayed in the formula is obviously reduced, and compared with the situation that the sulfur trioxide after the dedusting device is not sprayed in the sulfonation removal initiator, the removal rate is improved from 40.3% to 89.6%, and is improved by 49.6%.
Examples 2 to 5, and comparative examples 1 to 9 differ from example 1 in the formulation, in particular as described in table 1, and are not described in detail here.
Table 1 table of formulation proportions and test results of examples and comparative examples
Examples 6 to 11 and comparative examples 10 to 15 differ from example 1 in the reaction parameters, as specified in Table 2, and are not detailed here.
Table 2 examples and comparative examples the formulation proportions and test results are tabulated
As can be seen from comparison of examples 1 to 5 with comparative examples 1 to 9, the used sulfonation removal initiator comprises a surfactant, a water-soluble high molecular compound, an additive and water, and has a synergistic effect, so that the removal efficiency of sulfur trioxide is greatly improved.
It is understood from the comparison between examples 1 and 2 that the effect is better when the mass ratio of the polymer to the surfactant is 1:1 in example 2, and similarly, the removal efficiency is better than that in examples 3 to 5 and the removal efficiency is better than that in examples 4 and 5 when the mass ratio of the polymer to the surfactant is 1: 1.
As is clear from examples 1, 6 and 7 and comparative examples 10 and 11, the smaller the particle diameter, the smaller the SO3The higher the removal efficiency. This is because the smaller the droplet size, the larger the droplet group surface area, and the easier it is to collide with and intercept SO in flue gas3The more complete and rapid the sulfonation reaction takes place. The smaller the droplet size, the higher the nozzle requirements and the greater the atomization difficulty. On the contrary, the larger the particle size, the longer the droplet evaporation time, and the longer the droplet evaporation distance, the more difficult the arrangement in practical engineering application. Research shows that the liquid drops with the particle size within 100 mu m can realize complete evaporation, and the phenomenon that subsequent equipment and a flue are corroded due to the escape of the incompletely evaporated liquid drops is avoided. The droplet size is preferably 25 μm to 50 μm, combining technical and economic conditions.
As can be seen from examples 1, 8, 9, 10, 11, 12 and comparative examples 12, 13, the ratio of sulfonation removal initiator to flue gas concentration is large, and small amount of SO is contained3Can not be effectively removed, and the removal efficiency is lower. On the contrary, when the concentration ratio of the sulfonation desorption initiator to the flue gas is small, the evaporation and absorption of the liquid drops are more, the incomplete evaporation of the liquid drops is easy to occur, and the incomplete sulfonation reaction is caused, however, the influence of the increase or decrease of the concentration on the removal efficiency is limited, and the ratio of the input amount of the sulfonation desorption initiator to the mass of the sulfur trioxide is not less than 10:1, so that the better effect can be obtained, and the preferable ratio is (10-50: 1).
It is understood from examples 1, 13 and 14 and comparative examples 14 and 15 that the higher the temperature is in the range of 300 ℃ to 400 ℃, the better the removal effect is. At a lower temperature, the long polymer chains adsorbed on the particle surface are not fully extended, the adsorption and bridging effects are relatively weak, and the adsorption and bridging effects are on SO3The removal effect is reduced. On the contrary, at higher temperatures, the evaporation time of the droplets becomes faster, in combination with SO3The contact time is shortened, the sulfonation reaction time is limited, and the removal effect is reduced. The reaction temperature is preferably 300 ℃ to 400 ℃.
Application examples
The embodiment provides a sulfonation removal initiator, which comprises 0.1% of xanthan gum, 0.1% of hexadecyl trimethyl ammonium chloride, 0.05% of potassium chloride and the balance of water;
before a 300MW coal-fired unit air preheater, the sulfonation removal initiator described in the formula example (2) is sprayed into a vertical flue by a liquid distribution pump, compressed air and a double-flow atomizing nozzle in a particle size of 50 mu m, and the flue gas amount is 1980000m3H, SO in the flue gas by test3The concentration is about 31.6mg/m3The spraying amount of the sulfonation desorption initiator is 2.5m3H, calculated SO in flue gas3The mass ratio of the sulfonated photoinitiator to the sulfonated desorption initiator is 1: 39.96. the average concentration of sulfur trioxide in the discharged flue gas is reduced by 17.2mg per square meter compared with that before the implementation, and the removal efficiency reaches 54.3 percent.
The situation that the air preheater is blocked and the like can be effectively solved by demonstrating the pressure difference change condition of 4 months of continuous operation of the unit. Before the sulfonation initiator removal is put into the reactor, the average monthly values of the differential pressure of the air pre-heater are 757.7Pa, 1012.9Pa, 1204.8Pa and 1578.3Pa, the amplitude of the differential pressure rises by about 52 percent, and the blockage of the air pre-heater is increasingly serious; after the sulfonation removal initiator is put into the reactor, the average monthly values of the differential pressure of the air preheater are 999.0Pa, 783.1Pa, 866.4Pa and 777.9Pa, and the differential pressure of the air preheater is kept stable.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The sulfonation removal initiator for sulfur trioxide in coal-fired flue gas is characterized by comprising the following components in percentage by mass: 0.05-0.1% of surfactant, 0.05-0.1% of water-soluble high molecular compound, 0.005-0.02% of additive and the balance of water, wherein the water-soluble high molecular compound can perform sulfonation reaction with sulfur trioxide to generate an organic sulfonate high molecular compound.
2. The sulfonation removal initiator of claim 1, wherein the water-soluble polymer compound is any one of glucomannan and xanthan gum.
3. The sulfonation removal initiator of claim 2, wherein the surfactant is any one of cetyltrimethylammonium chloride and polyethylene glycol octylphenyl ether.
4. The sulfonation removal initiator of claim 1 or 2, wherein the additive is any one of potassium chloride and phytic acid.
5. The method for preparing the sulfonation removing initiator according to any one of claims 1 to 4, wherein the water-soluble polymer compound is added to water and stirred uniformly, the surfactant and the additive are added after the water-soluble polymer compound is completely dissolved, and finally the water-soluble polymer compound is stirred until the water-soluble polymer compound is completely dissolved.
6. Use of the sulphonation removal initiator according to any of claims 1 to 4, characterised in that it comprises a process for sulphur trioxide removal.
7. The use according to claim 6, characterized in that the sulphonation removal initiator is atomized to form droplets, which are sprayed into the flue before the air preheater for trapping sulphur trioxide for sulphur trioxide removal.
8. Use according to claim 7, wherein the droplets have a particle size of not more than 100 μm, preferably 25 μm to 50 μm.
9. Use according to claim 7, characterized in that the ratio of the input amount of the sulphonation removal initiator to the mass of sulphur trioxide is not less than 10:1, preferably (10-50: 1).
10. The use according to claim 7, characterized in that the temperature of the reaction of the sulphonation removal initiator with sulphur trioxide is 300-400 ℃.
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| PCT/CN2020/127695 WO2022088243A1 (en) | 2020-10-27 | 2020-11-10 | Sulfonation removal initiator for sulfur trioxide in coal-fired flue gas and application of sulfonation removal initiator |
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