CN116036822A - Desulfurization processing method suitable for double-alkali method - Google Patents
Desulfurization processing method suitable for double-alkali method Download PDFInfo
- Publication number
- CN116036822A CN116036822A CN202310085616.2A CN202310085616A CN116036822A CN 116036822 A CN116036822 A CN 116036822A CN 202310085616 A CN202310085616 A CN 202310085616A CN 116036822 A CN116036822 A CN 116036822A
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- Prior art keywords
- flue gas
- desulfurization
- calcium sulfite
- desulfurizing
- ventilation pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/96—Regeneration, reactivation or recycling of 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
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a processing method suitable for double-alkali desulfurization, which relates to the field of double-alkali desulfurization, and comprises the following steps: cooling the flue gas, wherein a ventilation pipe is arranged on the outer wall of the flue gas pipeline; step two: desulfurizing reaction, wherein the cooled flue gas enters a desulfurizing tower to spray alkali liquor; step three: high-temperature decomposition and high-temperature heating of the bottom of the calcium sulfite collecting tank; step four: redox, the calcium sulfite collecting tank is contacted with the air in the tank; step five: and desulfurizing and reducing, pushing the desulfurization liquid into a regeneration tank by a pushing mechanism, and reacting with the desulfurization liquid. According to the invention, the calcium sulfite is heated and decomposed into calcium oxide and sulfur dioxide, the sulfur dioxide is directly discharged through detection in the desulfurizing tower, the calcium oxide in the desulfurizing tower absorbs moisture in the air to generate calcium hydroxide, and then the calcium hydroxide can be discharged into the regenerating tank so as to reduce desulfurizing liquid into an absorbent, so that the process prevents the calcium sulfite from being blocked and reduces the subsequent work load of workers on the desulfurizing liquid.
Description
Technical Field
The invention relates to the field of double-alkali desulfurization, in particular to a desulfurization processing method suitable for a double-alkali method.
Background
The double alkali desulfurizing technology is to utilize sodium hydroxide solution as desulfurizing agent, and to pump the prepared sodium hydroxide solution into desulfurizing tower to wash and eliminate sulfur dioxide from fume to reach the desulfurizing aim.
The desulfurizing agent regeneration is generally to react sodium sulfite as a desulfurizing product with calcium hydroxide to generate calcium sulfite precipitate and sodium hydroxide solution, and part of calcium hydroxide possibly remains in the recycled sodium hydroxide solution and reacts with sulfur dioxide in a desulfurizing tower to generate calcium sulfite precipitate.
The invention discloses a Chinese patent with publication number of CN 101502754A, which provides a double-alkali desulfurization energy-saving process, because the flue gas led out from the kiln head of a tunnel kiln is sent into an air heat exchange system to carry out a heat exchange process with cold air which enters the air heat exchange system from the outside, and the heated cold air is sent into a gas producer to be used as a combustion improver and an oxidant, the energy of the gas producer can be saved by about 8%, and the cooled flue gas is more favorable for absorption of alkali liquor.
Because the calcium sulfite sediment generated in the desulfurizing tower is difficult to discharge in the desulfurizing process of the mechanism, the sediment in the desulfurizing tower can be caused, the desulfurizing reaction can be influenced, and the scaling and blocking in the desulfurizing tower can be caused.
Disclosure of Invention
Based on the above, the invention aims to provide a desulfurization processing method suitable for a double-alkali method, so as to solve the technical problems that in the desulfurization process of the mechanism, calcium sulfite sediment generated in a desulfurization tower is difficult to discharge, so that the sediment in the desulfurization tower is caused, the desulfurization reaction is influenced, and the scaling and the blocking in the desulfurization tower are caused.
In order to achieve the above purpose, the present invention provides the following technical solutions: a desulfurization processing method suitable for a double-alkali method comprises the following steps:
step one: the flue gas is cooled, a ventilation pipe is arranged on the outer wall of the flue gas pipeline, one end of the ventilation pipe is connected with a fan of the ventilation pipe, the fan is started, external cold air is absorbed by the fan, and the ventilation pipe flows in the outer wall of the flue gas pipeline;
step two: the flue gas after desulfurization reaction, the cooled flue gas enters a desulfurization tower, alkali liquor is sprayed at the top of the desulfurization tower, the flue gas moves upwards, the flue gas and the alkali liquor sprayed downwards carry out washing reaction in a countercurrent mode, and then the flue gas is discharged into the atmosphere through an online detection system in the desulfurization tower;
step three: the method comprises the steps of pyrolysis, wherein a calcium sulfite collecting tank is arranged at the bottom of a desulfurizing tower, calcium sulfite generated after reaction is collected into the collecting tank, a plurality of groups of U-shaped pipes are uniformly arranged at the bottom of the calcium sulfite collecting tank, and the other end of a ventilation pipe is connected with one end of each U-shaped pipe to heat the calcium sulfite collecting tank at high temperature;
step four: the oxidation-reduction, calcium sulfite collecting tanks are integrally exposed to the air, and internal sediments and moisture in the air are absorbed and oxidized;
step five: and desulfurizing and reducing, pushing the desulfurization liquid into a regeneration tank by a pushing mechanism, and reacting with the desulfurization liquid.
Through adopting above-mentioned technical scheme, the calcium sulfite is heated and is decomposed into calcium oxide and sulfur dioxide, and sulfur dioxide can directly discharge after the inside detection of desulfurizing tower, and inside calcium oxide absorbs the moisture in the air and generates calcium hydroxide, can discharge the calcium hydroxide into the regeneration pond later and be convenient for reduce the desulfurizing liquid into the absorbent, carries out reuse, and this process prevents when its calcium sulfite blocks up, and reduces the subsequent work burden to its processing of staff.
The invention further provides that the ventilation pipe in the first step is arranged in a ring shape, and the ventilation pipe surrounds the outer wall of the ventilation pipe.
Through adopting above-mentioned technical scheme, the setting of cyclic annular surrounding type is convenient for increase its and the heat transfer area of ventilation pipe, realizes inside flue gas rapid cooling.
The invention further provides that a plurality of groups of cyclone plates are arranged at the top in the desulfurizing tower in the second step, and spray heads are arranged on the cyclone plates.
Through adopting above-mentioned technical scheme, be convenient for increase its inside alkali lye spray area through the cooperation of whirl board and shower nozzle, improve its area of contact with the flue gas for its self reaction.
The invention further provides that the bottom of the three calcium sulfite collecting tanks in the step is also provided with a plurality of groups of electric heating wires.
Through adopting above-mentioned technical scheme, can carry out rapid heating to its calcium sulfite collecting vat with the temperature cooperation of flue gas through the heating wire, improve its whole reaction efficiency.
The invention further provides that the heating temperature of the heating wire is 600-700 ℃.
By adopting the technical scheme, the heating device is convenient for heating up and then decomposing the calcium sulfite by itself, and can also heat by the heating wire itself under the condition of insufficient flue gas temperature.
The invention further provides that the pushing mechanism in the fifth step comprises a pushing cylinder, and the pushing cylinder is positioned outside the desulfurizing tower.
Through adopting above-mentioned technical scheme, can push the calcium hydrate after absorbing moisture in the calcium sulfite collecting vat into the regeneration tank through pushing the cylinder and reduce its desulfurizing liquid into the absorbent.
The invention further provides that a stirring mechanism is arranged in the regeneration tank in the fifth step.
Through adopting above-mentioned technical scheme, be convenient for calcium hydrate and its desulfurizing liquid carry out the reaction reduction fast, improve its whole machining efficiency.
In summary, the invention has the following advantages:
according to the invention, the calcium sulfite collecting tank is arranged at the bottom of the desulfurizing tower, the cold air is preheated by the external fan at the high temperature of the flue gas in the working process, so that the temperature of the flue gas is reduced, the flue gas is convenient to quickly react with sodium hydroxide in the subsequent desulfurizing tower, the U-shaped pipe and the electric heating wire are arranged at the bottom of the calcium sulfite collecting tank, the air heated by the flue gas is matched with the electric heating wire, the integral temperature of the flue gas is increased, the calcium sulfite is heated and decomposed into calcium oxide and sulfur dioxide, the sulfur dioxide can be directly discharged after being detected in the desulfurizing tower, the calcium oxide in the interior absorbs the moisture in the air to generate calcium hydroxide, and then the calcium hydroxide can be discharged into the regenerating tank to facilitate reducing the desulfurizing liquid into absorbent for recycling, so that the calcium sulfite is prevented from being blocked in the process, and the working burden of workers on the subsequent treatment of the flue gas is reduced.
Detailed Description
The following will describe the technical scheme of the embodiment of the present invention clearly and completely. And are intended to be illustrative of the invention only and are not to be construed as limiting the invention.
Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.
A desulfurization processing method suitable for a double-alkali method comprises the following steps:
step one: the flue gas is cooled, the outer wall of the flue gas pipeline is provided with a vent pipe, one end of the vent pipe is connected with a fan of the vent pipe, the fan is started to absorb external cold air, the cold air flows in the vent pipe of the outer wall of the flue gas pipeline, the high temperature of the flue gas is preheated by the external fan in the working process, so that the temperature of the flue gas is reduced, the flue gas is convenient to quickly react with sodium hydroxide in a subsequent desulfurizing tower, the vent pipe is integrally annularly arranged and surrounds the outer wall of the vent pipe, the heat exchange area between the vent pipe and the vent pipe is conveniently increased, and the quick cooling of the internal flue gas is realized;
step two: the flue gas after desulfurization reaction, wherein the cooled flue gas enters a desulfurization tower, alkali liquor is sprayed at the top of the desulfurization tower, the flue gas moves upwards and is subjected to washing reaction with the alkali liquor sprayed downwards in a countercurrent mode, then the flue gas is discharged into the atmosphere through an online detection system in the desulfurization tower, a plurality of groups of cyclone plates are arranged at the top in the desulfurization tower, spray heads are arranged on the cyclone plates, and acid gases such as sulfur dioxide, sulfur trioxide and the like in the flue gas are fully absorbed, so that sodium sulfate and sodium bisulfate are generated, the spraying area of the alkali liquor in the flue gas is conveniently increased through the cooperation of the cyclone plates and the spray heads, the contact area between the flue gas and the flue gas is increased, and the self reaction of the flue gas is accelerated;
step three: the method comprises the following steps of performing high-temperature decomposition, wherein a calcium sulfite collecting tank is arranged at the bottom of a desulfurizing tower, calcium sulfite generated by precipitation after reaction is collected into the collecting tank, meanwhile, a plurality of groups of U-shaped pipes are uniformly arranged at the bottom of the calcium sulfite collecting tank, the other end of a ventilation pipe is connected with one end of each U-shaped pipe, the calcium sulfite collecting tank is heated at high temperature, a plurality of groups of heating wires are further arranged at the bottom of the calcium sulfite collecting tank, the calcium sulfite collecting tank can be rapidly heated through the temperature matching of the heating wires and flue gas, the overall reaction efficiency is improved, the heating temperature of the heating wires is 650 ℃, the heating wires are convenient to heat and decompose the calcium sulfite, under the condition that the temperature of the flue gas is insufficient, the heating wires can heat and decompose the calcium sulfite into calcium oxide and sulfur dioxide, and the sulfur dioxide can be directly discharged after being detected in the desulfurizing tower;
step four: the oxidation reduction, the calcium sulfite collecting tank is integrally exposed in the air, the internal sediment and the moisture in the air are absorbed and oxidized, and the calcium oxide after being heated and decomposed absorbs the moisture in the air to generate calcium hydroxide;
step five: the desulfurization reduction, promote its calcium hydrate to the regeneration tank in through pushing mechanism, react with its desulfurizing liquid, pushing mechanism is including promoting the cylinder, and promote the outside that the cylinder is located its desulfurizing tower, can push the calcium hydrate after absorbing moisture in the calcium sulfite collecting vat to the regeneration tank in through promoting the cylinder and reduce its desulfurizing liquid into the absorbent, carry out reuse, wherein be provided with rabbling mechanism in the regeneration tank, be convenient for calcium hydrate and its desulfurizing liquid and react the reduction fast, improve its whole machining efficiency.
Although embodiments of the invention have been shown and described, the detailed description is to be construed as exemplary only and is not limiting of the invention as the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples, and modifications, substitutions, variations, etc. may be made in the embodiments as desired by those skilled in the art without departing from the principles and spirit of the invention, provided that such modifications are within the scope of the appended claims.
Claims (7)
1. A desulfurization processing method suitable for a double-alkali method is characterized in that: the method comprises the following steps:
step one: the flue gas is cooled, a ventilation pipe is arranged on the outer wall of the flue gas pipeline, one end of the ventilation pipe is connected with a fan of the ventilation pipe, the fan is started, external cold air is absorbed by the fan, and the ventilation pipe flows in the outer wall of the flue gas pipeline;
step two: the flue gas after desulfurization reaction, the cooled flue gas enters a desulfurization tower, alkali liquor is sprayed at the top of the desulfurization tower, the flue gas moves upwards, the flue gas and the alkali liquor sprayed downwards carry out washing reaction in a countercurrent mode, and then the flue gas is discharged into the atmosphere through an online detection system in the desulfurization tower;
step three: the method comprises the steps of pyrolysis, wherein a calcium sulfite collecting tank is arranged at the bottom of a desulfurizing tower, calcium sulfite generated after reaction is collected into the collecting tank, a plurality of groups of U-shaped pipes are uniformly arranged at the bottom of the calcium sulfite collecting tank, and the other end of a ventilation pipe is connected with one end of each U-shaped pipe to heat the calcium sulfite collecting tank at high temperature;
step four: the oxidation-reduction, calcium sulfite collecting tanks are integrally exposed to the air, and internal sediments and moisture in the air are absorbed and oxidized;
step five: and desulfurizing and reducing, pushing the desulfurization liquid into a regeneration tank by a pushing mechanism, and reacting with the desulfurization liquid.
2. The method according to claim 1, wherein: the ventilation pipe in the first step is integrally arranged in a ring shape, and surrounds the outer wall of the ventilation pipe.
3. The method according to claim 1, wherein: and in the second step, a plurality of groups of cyclone plates are arranged at the top in the desulfurizing tower, and spray heads are arranged on the cyclone plates.
4. The method according to claim 1, wherein: the bottom of the three calcium sulfite collecting tanks in the step is also provided with a plurality of groups of electric heating wires.
5. The method according to claim 4, wherein: the heating temperature of the heating wire is 600-700 ℃.
6. The method according to claim 1, wherein: the pushing mechanism in the fifth step comprises a pushing air cylinder, and the pushing air cylinder is positioned outside the desulfurizing tower.
7. The method according to claim 1, wherein: and in the fifth step, a stirring mechanism is arranged in the regeneration tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310085616.2A CN116036822A (en) | 2023-02-09 | 2023-02-09 | Desulfurization processing method suitable for double-alkali method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310085616.2A CN116036822A (en) | 2023-02-09 | 2023-02-09 | Desulfurization processing method suitable for double-alkali method |
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| Publication Number | Publication Date |
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| CN116036822A true CN116036822A (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310085616.2A Pending CN116036822A (en) | 2023-02-09 | 2023-02-09 | Desulfurization processing method suitable for double-alkali method |
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| CN (1) | CN116036822A (en) |
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- 2023-02-09 CN CN202310085616.2A patent/CN116036822A/en active Pending
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