CN110882628A - Dry desulfurization process and equipment - Google Patents
Dry desulfurization process and equipment Download PDFInfo
- Publication number
- CN110882628A CN110882628A CN201911356145.4A CN201911356145A CN110882628A CN 110882628 A CN110882628 A CN 110882628A CN 201911356145 A CN201911356145 A CN 201911356145A CN 110882628 A CN110882628 A CN 110882628A
- Authority
- CN
- China
- Prior art keywords
- desulfurizing
- tower
- desulfurizing agent
- desulfurization
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
-
- 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
- B01D53/75—Multi-step processes
-
- 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
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- 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
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/70—Non-metallic catalysts, additives or dopants
- B01D2255/702—Carbon
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (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 dry desulfurizing process is based on solid desulfurizing agent and includes fixed bed equipment, waste gas fed into desulfurizing tower via power unit to contact with desulfurizing agent, and SO being carried by active carbon in desulfurizing agent2Catalytic oxidation to SO3，SO3Reacting with water to obtain sulfuric acid, reacting with alkaline substance in desulfurizing agent to obtain sulfate, and desulfurizing with desulfurizing efficiency up to 99% or more and SO2The content is less than or equal to 1mg/m3. The desulfurization equipment has the characteristics of low investment, small occupied area, simple maintenance and low operating cost, can be used at the rear end of the existing wet desulfurization process in series, and can also be used independentlyCan be used immediately to reach SO in waste gas2Deep fine removal of (3).
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a dry desulfurization process and equipment.
Background
The common power plant flue gas desulfurization technology is a wet limestone-gypsum method, which is a method for recovering gypsum by removing SO2 in flue gas in an absorption device. The method specifically comprises the following steps: preparing limestone powder into slurry, introducing flue gas into wet absorption tower of desulfurization device, and making it contact with alkaline limestone slurry fog drops sprayed from top to bottom in countercurrent mode, wherein acidic oxide SO is contained in the alkaline limestone slurry2Absorbed, the flue gas can be fully purified; absorption of SO2The slurry is reacted to generate CaSO3In-situ forced oxidation and crystallization to form CaSO4·2H2And O, dehydrating to obtain a commercial grade desulfurization byproduct, namely gypsum, and finally realizing the comprehensive treatment of the sulfur-containing flue gas. The desulfurization technology is the most widely applied method for flue gas desulfurization at present, the desulfurization efficiency can reach more than 95%, the method is suitable for high, medium and low sulfur coal, and the biggest defects are that the equipment is very huge, the occupied area is huge, and the investment and the operating cost are high. Some enterprises can adopt a flue gas circulating fluidized bed desulfurization process, which is a technology for introducing a solid fluidization technology into the flue gas desulfurization process, and lime powder with the moisture content of 3% -5% is adopted as a desulfurizing agent, and is contacted with high-speed flowing flue gas in a fluidized bed to complete desulfurization, an absorbent removed from the tail part of the fluidized bed is humidified and then recycled, and the desulfurization rate can reach 80-90% under the condition that the calcium-sulfur ratio is 1.1-1.5.
In view of this, the invention is particularly proposed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a dry desulfurization process and equipment, wherein a solid desulfurizer is used as a base, fixed bed equipment is adopted, waste gas is sent into a desulfurization tower from a power device to be contacted with the desulfurizer, and activated carbon and SO with heavy load of the desulfurizer2Catalytic oxidation to SO3，SO3Reacting with water to obtain sulfuric acid, reacting with alkaline substance in desulfurizing agent to obtain sulfate, and desulfurizing with desulfurizing efficiency up to 99% or more and SO2The content is less than or equal to 1mg/m3。
The invention aims to provide a dry desulfurization process.
It is another object of the present invention to provide an apparatus for use in the above dry desulfurization process.
According to the dry desulfurization process of the embodiment of the present invention, the dry desulfurization process comprises the steps of:
(1) preparing a desulfurizing agent, wherein the desulfurizing agent is prepared from the following raw materials, and the raw materials comprise active carbon and alkaline substances;
(2) conveying waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously supplementing water into the desulfurizing tower to oxidize sulfur dioxide into sulfur trioxide, wherein the sulfur trioxide and water generate sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
According to the dry desulfurization process of the embodiment of the invention, in the step (1), the alkaline substances are oxides or/and hydroxides of Mg, Ca and Na.
According to the dry desulfurization process of the specific embodiment of the invention, in the step (1), the raw materials of the desulfurizing agent further comprise red mud, a binder and a pore-forming agent.
According to the dry desulfurization process of the embodiment of the invention, in the step (1), the particle size of the desulfurizing agent is 0.5-2 mm.
The dry desulfurization process according to an embodiment of the present invention, wherein, in the step (1), the bulk density of the desulfurizing agent is 0.8 to 1 kg/L.
According to the dry desulfurization process of the embodiment of the invention, in the step (2), the amount of the supplemented water is 2-100ml per cubic meter of the waste gas.
According to the dry desulfurization process of the embodiment of the present invention, in the step (2), the temperature in the desulfurization tower is 20 to 200 ℃.
The further red mud is Bayer process red mud. It contains a large amount of alkaline substances, and can react with sulfuric acid to generate sulfate. Meanwhile, the red mud can be used for solving the pollution problem caused by the open stacking of the red mud.
Furthermore, the binder can be water glass, and the pore-forming agent is wood dust.
Further, the mass sulfur capacity of the desulfurizer is more than or equal to 15%. The sulfur capacity calculation method comprises the following steps: the total weight of the sulfur dioxide removal divided by ÷ (weight of desulfurizing agent-water content), in%. And testing the water content of the desulfurizer to finally calculate the sulfur capacity.
According to the dry desulfurization process of the specific embodiment of the invention, in the step (2), the pressure in the desulfurization tower is-10 Kpa to 100Kpa, and the reaction space velocity of the desulfurization tower is less than or equal to 4000h-1. The reaction space velocity is the volume number of the waste gas passing through the unit volume of the desulfurizer in unit time under the specified conditions. I.e. the amount of gas treated by the catalyst, in m3/(m3Catalyst h) to h)-1。。
According to the equipment used in the dry desulfurization process, the equipment comprises a desulfurization tower and a power device, wherein a charging hole is formed in the top of the desulfurization tower, an air outlet and a pressure monitoring device are arranged on the upper portion of the desulfurization tower, a discharge hole and an air inlet are formed in the lower portion of the desulfurization tower, a sewage discharge hole is formed in the bottom of the desulfurization tower, an interlayer is further arranged on the lower portion of the desulfurization tower, a distribution plate is arranged on the upper surface of the interlayer, inert fillers are arranged in the interlayer, a water replenishing pipe is arranged in the middle of the interlayer, one end of the water replenishing pipe extends into the interlayer, and the other end of the water replenishing pipe extends out of the desulfurization tower. The distribution plate is a gas distribution plate. And measuring the bed layer pressure difference by adopting a pressure detection device.
Further, the power device is a fan.
Further, the inert filler is inert ceramic balls.
Further, the distribution plate is a gas distribution plate with a porous structure. The gas is dispersed by the action and the structural holes on the distribution plate and uniformly enters the desulfurizer bed layer, so that the problem of bias flow of the gas can be effectively solved.
The equipment used in the dry desulphurization process according to the specific embodiment of the invention, wherein the lower side of the desulphurization tower is also provided with another pressure monitoring device; the desulfurizing tower is provided with a support.
The method is essentially different from the common adsorption process in that the active carbon is used for adsorbing the sulfur dioxide in the presence of water vapor and oxygen, and the surface of the active carbon adsorbs the water vapor, the oxygen and the sulfur dioxide and oxidizes the sulfur dioxide into sulfuric acid.
The bottom of the desulfurizing tower is provided with an interlayer, and a water adding device for supplementing water into the desulfurizing tower is arranged in the interlayer SO as to ensure that SO in the desulfurizing tower3Reacts with water to become sulfuric acid.
The invention is used for treating SO in the waste gas2The method for deep desulfurization comprises the step of carrying out deep desulfurization on SO-containing gas by a power plant2When the waste gas is introduced into the desulfurizing tower, the waste gas is fully contacted with a desulfurizing agent in the desulfurizing tower, and the activated carbon with heavy load in the desulfurizing agent and SO in the waste gas2Oxygen and water, and SO2Catalytic oxidation to sulfuric acid, formula 1:
the sulfuric acid reacts with alkaline substances in the desulfurizer to generate stable sulfate, so that the aim of deep desulfurization is fulfilled, and the chemical reaction formula is as shown in formula 2:
in formula 2, MO represents a basic substance. By the dry desulfurization process of the invention, SO in the exhaust gas is treated2Deep removal is carried out, the desulfurization efficiency can reach more than 99 percent, and SO is generated after desulfurization2The content is less than or equal to 1mg/m3。
The desulfurizer of the invention is a fine desulfurizer which is prepared by adopting oxides or/and hydroxides of Mg, Ca and Na, active carbon and red mud as main bodies, compounding a binder and a pore-forming agent, drying, crushing, mixing, kneading, extruding, molding, shaping by a pair of rollers and screening.
Compared with the prior art, the invention has the beneficial effects that: the dry desulfurization process of the invention is based on a solid desulfurizing agent and adopts a solidThe waste gas is fed into the desulfurizing tower by a power device to contact with a desulfurizing agent, and SO is converted by activated carbon loaded in the desulfurizing agent2Catalytic oxidation to SO3，SO3Reacting with water to obtain sulfuric acid, reacting with alkaline substance in desulfurizing agent to obtain sulfate, and desulfurizing with desulfurizing efficiency up to 99% or more and SO removed2The content is less than or equal to 1mg/m3. The desulfurization equipment has the characteristics of low investment, small occupied area, simple maintenance and low operating cost, can be used in series at the rear end of the existing wet desulfurization process, can also be used independently, and can achieve the purpose of SO in waste gas2Deep fine removal of (3).
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a desulfurization tower in the present invention.
1. A charging port; 2. an air outlet; 3. a pressure monitoring device; 4. a discharge opening; 5. an air inlet; 6. a sewage draining outlet; 7. an interlayer; 8. a gas distribution plate; 71. an inert filler; 9. a water replenishing pipe; 10. another pressure monitoring device; 11. another gas distribution plate; 12. and (4) a bracket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In some more specific embodiments, the dry desulfurization process comprises the steps of:
(1) preparing a desulfurizing agent, wherein the desulfurizing agent is prepared from the following raw materials, and the raw materials comprise active carbon and alkaline substances;
(2) conveying the waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously replenishing water into the desulfurizing tower to oxidize sulfur dioxide into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
In a more specific embodiment, the dry desulfurization process comprises the following steps:
(1) preparing a desulfurizing agent, wherein the desulfurizing agent is prepared from the following raw materials, and the raw materials comprise active carbon and alkaline substances; the alkaline substance is oxides or/and hydroxides of Mg, Ca and Na; the raw materials of the desulfurizer also comprise red mud, a binder and a pore-forming agent;
(2) conveying waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, keeping the temperature of the desulfurizing tower at 20-200 ℃, and simultaneously replenishing water into the desulfurizing tower to oxidize sulfur dioxide into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizer to generate sulfate, and the desulfurization process is finished; adding 2-100ml of water for every 1 cubic meter of waste gas; the pressure in the desulfurizing tower is-10-100 Kpa, and the reaction space velocity of the desulfurizing tower is less than or equal to 4000h-1。
Example 1
The embodiment discloses a dry desulfurization process, which comprises the following steps:
(1) preparing a desulfurizing agent, namely putting the desulfurizing agent into a desulfurizing tower, wherein the desulfurizing agent is prepared from the following raw materials, namely activated carbon, magnesium oxide, red mud, a binder and a pore-forming agent, and is prepared into the desulfurizing agent with the particle size of 0.5-2mm through drying, crushing, mixing, kneading, extruding, molding, shaping by a pair of rollers and screening, and the bulk density of the desulfurizing agent is 0.8 kg/L;
(2) keeping the temperature in the desulfurizing tower below 20-70 ℃, sending the waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously supplementing water into the desulfurizing tower, wherein 10ml of waste gas supplementing water is fed every 1 cubic meter to oxidize sulfur dioxide into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
Example 2
The embodiment discloses a dry desulfurization process, which comprises the following steps:
(1) preparing a desulfurizing agent, namely putting the desulfurizing agent into a desulfurizing tower, wherein the desulfurizing agent is prepared from the following raw materials, namely activated carbon, magnesium oxide, red mud, a binder and a pore-forming agent, and is prepared into the desulfurizing agent with the particle size of 0.5-2mm through drying, crushing, mixing, kneading, extruding, molding, shaping by a pair of rollers and screening, and the bulk density of the desulfurizing agent is 1 kg/L;
(2) keeping the temperature in the desulfurizing tower at 70-100 ℃, feeding the waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously replenishing water into the desulfurizing tower, wherein 20ml of waste gas replenishing water is fed every 1 cubic meter to oxidize sulfur dioxide into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
Example 3
The embodiment discloses a dry desulfurization process, which comprises the following steps:
(1) preparing a desulfurizer, namely putting the desulfurizer into a desulfurizing tower, wherein the desulfurizer is prepared from the following raw materials, namely activated carbon, sodium hydroxide, red mud, a binder and a pore-forming agent, and the raw materials are dried, crushed, mixed, kneaded, extruded, molded, shaped by a pair of rollers and sieved to prepare the desulfurizer with the particle size of 0.5-2mm, the bulk density of the desulfurizer is 0.9kg/L, and the mass sulfur capacity of the desulfurizer is more than or equal to 15%;
(2) keeping the temperature in the desulfurization tower at 100-150 ℃ and the pressure in the desulfurization tower at-10-100 Kpa, feeding the waste gas into the desulfurization tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously supplementing water into the desulfurization tower, wherein 30ml of waste gas supplementing water is fed every 1 cubic meter of waste gas supplementing water, so that sulfur dioxide is oxidized into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
Example 4
The embodiment discloses a dry desulfurization process, which comprises the following steps:
(1) preparing a desulfurizer, namely putting the desulfurizer into a desulfurizing tower, wherein the desulfurizer is prepared from the following raw materials, namely active carbon, calcium oxide, red mud, water glass and wood dust, and the desulfurizer with the particle size of 0.5-2mm is prepared by drying, crushing, mixing, kneading, extruding, molding, shaping by a pair of rollers and screening, the bulk density of the desulfurizer is 0.9kg/L, and the mass sulfur capacity of the desulfurizer is more than or equal to 15%;
(2) the temperature in the desulfurization tower is kept at 150-180 ℃, the pressure in the desulfurization tower is 0-100Kpa, and the reaction space velocity of the desulfurization tower is 3500-4000h-1Feeding the waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously replenishing water into the desulfurizing tower, wherein 50ml of water is replenished for every 1 cubic meter of waste gas, so that sulfur dioxide is oxidized into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
The equipment used in the dry desulfurization process comprises a desulfurization tower and a power device, wherein the top of the desulfurization tower is provided with a charging hole 1, the upper part of the desulfurization tower is provided with an air outlet 2 and a pressure monitoring device 3, the lower part of the desulfurization tower is provided with a discharge hole 4 and an air inlet 5, the bottom of the desulfurization tower is provided with a sewage discharge hole 6, the lower part of the desulfurization tower is also provided with an interlayer 7, the upper surface and the lower surface of the interlayer are both provided with air distribution plates 8, the interlayer is internally provided with an inert filler 71, the middle of the interlayer is provided with a water supplementing pipe 9, one end of the water supplementing pipe is closed and extends into the interlayer, the side wall of the part of the water supplementing pipe extending into the interlayer is provided with a plurality of water supplementing holes, the other end of the water supplementing pipe extends out of the desulfurization tower, and the lower side of the desulfurization tower is; the upper portion of desulfurizing tower is equipped with another gas distribution plate 11, the outer downside of desulfurizing tower is equipped with support 12.
Specifically, the power device is a fan.
Specifically, the inert filler is an inert ceramic ball.
Specifically, the aperture of the water replenishing hole is 1-5 mm.
Specifically, the air inlet and the discharge opening are arranged on the lower side of the interlayer.
Specifically, the pressure detection device is a pressure sensor. The pressure sensor can detect the pressure of gas in the desulfurizing tower, and whether the system is blocked or not is judged by pressure measurement, so that the water supplementing quantity is adjusted.
Specifically, the distribution plate is a gas distribution plate with a porous structure.
More specifically, the gas distribution plate is provided with a plurality of air holes, and the aperture of each air hole is 2-6 mm.
A desulfurizer bed layer is arranged between the other gas distribution plate and the gas distribution plate on the upper surface of the interlayer. And a desulfurizer is arranged on the gas distribution plate on the upper surface of the interlayer.
Water in the water replenishing pipe enters the interlayer through the water replenishing holes, is uniformly dispersed through the inert filler, and uniformly enters the desulfurizer bed layer through the air holes of the air distribution plate on the upper surface of the interlayer, so that the problem of bias flow of air can be effectively solved.
The desulfurizing tower of the invention is specially used for SO2The structure of the desulfurizing tower designed by the fine desulfurizing agent is similar to that of a desulfurizing tower in the existing natural gas or synthetic gas desulfurizing process, and the applicant finds that the service time is greatly shortened and the normal use of the desulfurizing agent is influenced if sufficient moisture is not supplemented in the use process of the desulfurizing agent, so that an interlayer is designed at the bottom of the desulfurizing tower. The interlayer has the function of uniformly supplementing water required by reaction into a desulfurizer bed layer in the using process of the desulfurizer. And the excessive water supplement amount can cause system blockage and influence normal use. Therefore, the pressure detection devices are designed at the front end and the rear end of the bed layer, and the water replenishing amount is controlled by the pressure detection devices, so that the blockage caused by overlarge resistance is prevented.
When the desulfurizer is used, the charging port is opened, the other gas distribution plate is opened, the desulfurizer is placed, the other gas distribution plate is well installed, the power device introduces waste gas from the gas inlet, and meanwhile, water is supplemented through the water supplementing pipe according to the required amount, the waste gas carries water vapor through the interlayer, enters the desulfurizer bed layer, contacts with the desulfurizer, is desulfurized, and flows out of the gas outlet.
Comparative example 1
The only difference between this comparative example and example 4 is that no calcium oxide was added to the desulphurizing agent.
Comparative example 2
The only difference between this comparative example and example 4 is that 120ml of make-up water per 1 cubic meter of off-gas feed.
Desulfurization effect test
Test example 1
The method of example 4, the method of comparative example 1 and the method of comparative example 2 are respectively used for desulfurizing the waste gas of the power plant, the flow rate of the flue gas is 200L/h, and the reaction space velocity is 3500-4000h-1Keeping the temperature in the desulfurizing tower at 150-180 ℃, the pressure in the desulfurizing tower at 0-100Kpa, and desulfurizing SO2The content is the average SO content of the flue gas in the 1 st hour2The content results are shown in tables 1 to 3.
TABLE 1 SO2The content is 4300mg/m3Before and after flue gas desulfurization
| Group of | SO before desulfurization2Content (0 mg/m)3) | Desulfurized SO2Content (mg/m)3) |
| Example 4 | 4300 | 0.1 |
| Comparative example 1 | 4300 | 389 |
| Comparative example 2 | 4300 | Too much water supply causes blockage |
TABLE 2 SO2The content is 6100mg/m3Before and after flue gas desulfurization
TABLE 3 SO2The content is 7800mg/m3Before and after flue gas desulfurization
| Group of | SO before desulfurization2Content (mg/m)3) | Desulfurized SO2Content (mg/m)3) |
| Example 4 | 7800 | 0.3 |
| Comparative example 1 | 7800 | 589 |
| Comparative example 2 | 7800 | 241 |
As can be seen from tables 1-3, the desulfurization effect is better after desulfurization by the dry desulfurization process of the invention, the desulfurization efficiency can reach more than 99%, and SO is removed after desulfurization2The content is less than or equal to 1mg/m3(ii) a The comparative example 1 or 2 has lower desulfurization efficiency, which shows that calcium oxide in the desulfurizer plays a critical role in desulfurization efficiency, and the desulfurization efficiency is directly influenced by the amount of water supplement.
In the desulfurization process, the SO in the desulfurized flue gas is constantly detected2In the case of SO2The content is more than 1mg/m3When the desulfurizing agent is used, the desulfurizing agent is replaced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A dry desulfurization process, characterized in that it comprises the following steps:
(1) preparing a desulfurizing agent, wherein the desulfurizing agent is prepared from the following raw materials, and the raw materials comprise active carbon and alkaline substances;
(2) conveying the waste gas into the desulfurizing tower in the step (1) from a power device to contact with a desulfurizing agent, and simultaneously supplementing water into the desulfurizing tower to oxidize sulfur dioxide into sulfur trioxide which is absorbed by water to be changed into sulfuric acid; the sulfuric acid reacts with alkaline substances in the desulfurizing agent to generate sulfate, and the desulfurizing process is completed.
2. The dry desulfurization process according to claim 1, wherein in step (1), the alkaline substance is oxides or/and hydroxides of Mg, Ca and Na.
3. The dry desulfurization process according to claim 1 or 2, wherein in step (1), the raw materials of the desulfurizing agent further comprise red mud, a binder and a pore-forming agent.
4. The dry desulfurization process according to claim 1 or 2, wherein the desulfurizing agent has a particle size of 0.5 to 2mm in step (1).
5. The dry desulfurization process according to claim 1 or 2, wherein the bulk density of the desulfurizing agent in step (1) is 0.8 to 1 kg/L.
6. The dry desulfurization process according to claim 1, wherein the amount of the make-up water in step (2) is 2 to 100mg per cubic meter of the exhaust gas.
7. The dry desulfurization process according to claim 1, wherein the temperature in the desulfurization tower in the step (2) is 20 to 200 ℃.
8. The dry desulfurization process according to claim 1, wherein in the step (2), the pressure in the desulfurization tower is-10 Kpa to 100Kpa, and the reaction space velocity of the desulfurization tower is not more than 4000h-1。
9. An apparatus used in the process of any one of claims 1 to 8, wherein the apparatus comprises a desulfurizing tower and a power device, the top of the desulfurizing tower is provided with a charging port, the upper part of the desulfurizing tower is provided with an air outlet and a pressure monitoring device, the lower part of the desulfurizing tower is provided with a discharge port and an air inlet, the bottom of the desulfurizing tower is provided with a sewage discharge port, the lower part of the desulfurizing tower is further provided with an interlayer, the upper surface of the interlayer is provided with a distribution plate, the interlayer is internally provided with an inert filler, the middle of the interlayer is provided with a water replenishing pipe, one end of the water replenishing pipe extends into the interlayer, and the other end of the water replenishing pipe extends out of the desulfurizing tower.
10. The apparatus of claim 1, wherein the lower side of the desulfurization tower is further provided with another pressure monitoring device; the desulfurizing tower is provided with a support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911356145.4A CN110882628A (en) | 2019-12-25 | 2019-12-25 | Dry desulfurization process and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911356145.4A CN110882628A (en) | 2019-12-25 | 2019-12-25 | Dry desulfurization process and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110882628A true CN110882628A (en) | 2020-03-17 |
Family
ID=69753071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911356145.4A Pending CN110882628A (en) | 2019-12-25 | 2019-12-25 | Dry desulfurization process and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110882628A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111617627A (en) * | 2020-05-19 | 2020-09-04 | 上海兴国惠环保科技有限公司 | Spherical desulfurizing agent and preparation method thereof |
| CN112337478A (en) * | 2020-11-19 | 2021-02-09 | 营口理工学院 | Preparation method of fuel oil, gasoline and diesel oil desulfurization catalyst modified by supported auxiliary agent |
| CN114377541A (en) * | 2021-12-12 | 2022-04-22 | 中海油天津化工研究设计院有限公司 | Preparation method of low-temperature desulfurizing agent |
| CN114669304A (en) * | 2021-12-31 | 2022-06-28 | 山东庚辰环保新材料有限公司 | Desulfurization catalyst and preparation method thereof |
| CN115634559A (en) * | 2021-12-31 | 2023-01-24 | 山东庚辰环保新材料有限公司 | Wet desulfurization device, process and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05301018A (en) * | 1991-08-09 | 1993-11-16 | Babcock Hitachi Kk | Device for treating combustion exhaust gas |
| CN206051969U (en) * | 2016-08-29 | 2017-03-29 | 陕西燃气集团新能源发展有限公司 | A kind of selexol process reaction unit |
| CN107213787A (en) * | 2017-06-29 | 2017-09-29 | 山东庚辰环保新材料有限公司 | A kind of desulfurizing agent and preparation method thereof |
-
2019
- 2019-12-25 CN CN201911356145.4A patent/CN110882628A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05301018A (en) * | 1991-08-09 | 1993-11-16 | Babcock Hitachi Kk | Device for treating combustion exhaust gas |
| CN206051969U (en) * | 2016-08-29 | 2017-03-29 | 陕西燃气集团新能源发展有限公司 | A kind of selexol process reaction unit |
| CN107213787A (en) * | 2017-06-29 | 2017-09-29 | 山东庚辰环保新材料有限公司 | A kind of desulfurizing agent and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王建伟 等: ""活性炭吸附法烟气脱硫关键参数的研究"", 《锅炉技术》, no. 2004, pages 67 - 70 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111617627A (en) * | 2020-05-19 | 2020-09-04 | 上海兴国惠环保科技有限公司 | Spherical desulfurizing agent and preparation method thereof |
| CN112337478A (en) * | 2020-11-19 | 2021-02-09 | 营口理工学院 | Preparation method of fuel oil, gasoline and diesel oil desulfurization catalyst modified by supported auxiliary agent |
| CN114377541A (en) * | 2021-12-12 | 2022-04-22 | 中海油天津化工研究设计院有限公司 | Preparation method of low-temperature desulfurizing agent |
| CN114669304A (en) * | 2021-12-31 | 2022-06-28 | 山东庚辰环保新材料有限公司 | Desulfurization catalyst and preparation method thereof |
| CN115634559A (en) * | 2021-12-31 | 2023-01-24 | 山东庚辰环保新材料有限公司 | Wet desulfurization device, process and application |
| CN115634559B (en) * | 2021-12-31 | 2023-08-04 | 山东庚辰环保新材料有限公司 | Wet desulfurization device, process and application |
| CN114669304B (en) * | 2021-12-31 | 2023-11-03 | 山东庚辰环保新材料有限公司 | Desulfurization catalyst and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110882628A (en) | Dry desulfurization process and equipment | |
| CN109603459B (en) | Low-temperature dry flue gas desulfurizer and preparation method and application thereof | |
| AU2016288473B2 (en) | Method and apparatus for removing nitrogen oxides from air flow | |
| CN102019135B (en) | Flue gas-based combined desulfuration and denitration method and special device for method | |
| CN1962034A (en) | Method and apparatus for removing sulfur, nitrate and mercury simultaneously from boiler flue gas | |
| CN211886232U (en) | Sodium-based dry desulfurization system applied to low-sulfur flue gas working condition | |
| CN107551811B (en) | Sintering flue gas SCR denitration process based on dry method and semi-dry desulphurization | |
| CN110732228B (en) | Flue gas desulfurization method and apparatus | |
| CN102989313B (en) | Flue gas denitration reaction device of catalytic fluidized bed | |
| CN106731585B (en) | Coke oven flue gas dry-type desulfurization device, coke oven flue gas dry-type desulfurization and dust removal integrated system and method | |
| CN105536503A (en) | Method for removing nitric oxide from airflow | |
| CN102019143B (en) | Method for joint desulfurization and denitration of flue gas and special device thereof | |
| CN113441007A (en) | Active carbon integration SOx/NOx control system | |
| CN211800016U (en) | Moving bed dry desulfurization device using calcium-based desulfurizer | |
| CN211562517U (en) | Dry desulfurization equipment | |
| CN112221325A (en) | Circulating double-feeding dry desulfurization method | |
| CN111450659A (en) | Active coke dry method desulfurization device and process for flue gas | |
| JP3999995B2 (en) | Dry smoke purification system | |
| CN112933910B (en) | Moving bed coupling absorption desulfurization method based on flue gas semidry method | |
| CN210572159U (en) | Evaluation system for reaction efficiency of dry-process reactant | |
| CN214735587U (en) | Active carbon integrated blast furnace gas fine desulfurization reactor | |
| CN213286346U (en) | Flue gas desulfurization system with moving bed reaction device and cementing material production system | |
| CN213433781U (en) | Circulation double-feeding dry desulphurization device | |
| CN102029141B (en) | Modified attapulgite flue gas desulfurization agent and preparation and application thereof | |
| CN109569260B (en) | Circulating fluidized bed boiler flue gas desulfurization device and process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |