CN105854574A - Pulverized coal boiler flue gas desulfurization process - Google Patents
Pulverized coal boiler flue gas desulfurization process Download PDFInfo
- Publication number
- CN105854574A CN105854574A CN201610264045.9A CN201610264045A CN105854574A CN 105854574 A CN105854574 A CN 105854574A CN 201610264045 A CN201610264045 A CN 201610264045A CN 105854574 A CN105854574 A CN 105854574A
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- CN
- China
- Prior art keywords
- flue gas
- calcium sulfite
- lime slurry
- desulfurization
- boiler
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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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
-
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Geology (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (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 discloses a pulverized coal boiler flue gas desulfurization process. The process comprises the following steps: introducing flue gas generated by a pulverized coal boiler into lime slurry, and stirring the lime slurry by a stirrer, wherein lime in the lime slurry and sulfur dioxide in the flue gas have reaction to produce calcium sulfite; and then introducing air into calcium sulfite, and adding a catalyst, manganous ions, wherein calcium sulfite in a calcium sulfite solution is subjected to oxidation reaction to produce gypsum. The process has the advantages that the desulfurization efficiency is high, the process can be applicable to desulfurization of all types of coal, the cost of a desulfurizer is low, the byproduct, gypsum, can be comprehensively utilized, and no secondary pollution is generated.
Description
Technical field
The present invention relates to pulverized-coal fired boiler technical field, especially, relate to a kind of desulfurizing fume of coalpowder boiler technique.
Background technology
Pulverized-coal fired boiler is widely used in industrial circle, directly uses coal-fired as combustion material, containing a large amount of sulfide in fire coal, the flue gas of burning and exhausting also can contain a large amount of sulfide, flue gas directly amplifies in gas, and sulfide can produce acid rain, and the pollution to environment is extremely serious.Therefore, the desulfurization for pulverized-coal fired boiler processes particularly important.
At present, the desulfurization of pulverized-coal fired boiler is broadly divided into four kinds of patterns: one is desulfurization technology before fire coal, two is desulfurization technology in fire coal, three is desulfurization technology during coal converts, four is desulfurization technology after fire coal.Before coal-fired, desulfurization technology mainly carries out desulfurization by physics, chemistry, biological desulfurizing technology to the coal before entering boiler；In fire coal, desulfurization technology is by capturing sulfur briquette technology or CFBC desulfurization technology, carries out desulfurization during burning of coal；During coal converts, desulfurization technology mainly has Coal Gasification Technology, coal liquefaction technology and COAL-WATER SLURRY TECHNOLOGY；After fire coal, desulfurization technology is that the flue gas producing fire coal carries out desulfurization process.For first three desulfurization technology, all there is cost high, the defect of bad desulfurization effects.Wherein, the flue gas desulfurization technique relative inexpensiveness of pulverized-coal fired boiler, it is easier to be widely used；Therefore, the flue gas desulfurization technique of pulverized-coal fired boiler is always the direction of industry research.
At present, the flue gas desulfurization technique that industry is conventional, such as ammonia sulfur removal technology, use ammonia as desulfurization absorbent, mix with the smoke contacts entering reaction tower, sulfur dioxide in flue gas is reacted with ammonia, generating ammonium sulfite, this process process efficiency is poor, and fume emission is the most up to standard, ammonia has corrosivity simultaneously, easily causes damage equipment.
Summary of the invention
Present invention aim at providing a kind of desulfurizing fume of coalpowder boiler technique, to solve in prior art, ammonia sulfur removal technology efficiency is low, the problem that equipment easily causes corrosion.
For achieving the above object, the present invention provides a kind of desulfurizing fume of coalpowder boiler technique, comprise the following steps: the flue gas that pulverized-coal fired boiler produces is passed in lime slurry, by agitator, lime slurry is stirred simultaneously, the sulfur dioxide accelerated in flue gas reacts with Calx, and the Calx in described lime slurry and the sulfur dioxide in described flue gas react generation calcium sulfite；To be passed through air in described calcium sulfite solution again, owing to calcium sulfite character is unstable, for avoiding calcium sulfite again to decompose release sulfur dioxide, add catalyst divalent manganesetion, accelerate the oxidation reaction of calcium sulfite, calcium sulfite oxidation reaction generates Gypsum Fibrosum.
Further, the solid content of described lime slurry is 20%-25%.
Further, the temperature of described lime slurry is 45 DEG C-50 DEG C, and the rotating speed of described agitator is that 200-280 turns/min, and air mass flow is 0.12-0.18m/min.
The method have the advantages that
Desulfurization degree is high, it is possible to the desulfurization being applicable to all coals processes, and desulfurizing agent low cost, by-product Gypsum Fibrosum can comprehensively utilize, and will not produce secondary pollution.
Detailed description of the invention
Hereinafter embodiments of the invention are described in detail.
The preferred embodiments of the present invention provide a kind of desulfurizing fume of coalpowder boiler technique, comprise the following steps: the flue gas that pulverized-coal fired boiler produces is passed in lime slurry, being stirred lime slurry by agitator, the Calx in described lime slurry and the sulfur dioxide in described flue gas react generation calcium sulfite simultaneously；To be passed through air in described calcium sulfite solution again, and add catalyst divalent manganesetion, the calcium sulfite oxidation reaction in described calcium sulfite solution generates Gypsum Fibrosum.This sulfur removal technology, desulfurization degree is high, it is possible to the desulfurization being applicable to all coals processes, and desulfurizing agent low cost, by-product Gypsum Fibrosum can comprehensively utilize, and will not produce secondary pollution.
Sulfur content in flue gas is generally about 6%, it is preferable that for ensureing desulfurization degree, the solid content of described lime slurry is 20%-25%.
Preferably, for improving the response speed in links, the temperature of described lime slurry is 45 DEG C-50 DEG C, and the rotating speed of described agitator is that 200-280 turns/min, and air mass flow is 0.12-0.18m/min.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention；For a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (3)
1. a desulfurizing fume of coalpowder boiler technique, it is characterised in that comprise the following steps:
Being passed in lime slurry by the flue gas that pulverized-coal fired boiler produces, be stirred lime slurry by agitator simultaneously, the Calx in described lime slurry and the sulfur dioxide in described flue gas react generation calcium sulfite；To be passed through air in described calcium sulfite solution again, and add catalyst divalent manganesetion, the calcium sulfite oxidation reaction in described calcium sulfite solution generates Gypsum Fibrosum.
Desulfurizing fume of coalpowder boiler technique the most according to claim 1, it is characterised in that:
The solid content of described lime slurry is 20%-25%.
Desulfurizing fume of coalpowder boiler technique the most according to claim 2, it is characterised in that:
The temperature of described lime slurry is 45 DEG C-50 DEG C, and the rotating speed of described agitator is that 200-280 turns/min, and air mass flow is 0.12-0.18m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610264045.9A CN105854574A (en) | 2016-04-26 | 2016-04-26 | Pulverized coal boiler flue gas desulfurization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610264045.9A CN105854574A (en) | 2016-04-26 | 2016-04-26 | Pulverized coal boiler flue gas desulfurization process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105854574A true CN105854574A (en) | 2016-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610264045.9A Pending CN105854574A (en) | 2016-04-26 | 2016-04-26 | Pulverized coal boiler flue gas desulfurization process |
Country Status (1)
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| CN (1) | CN105854574A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101088592A (en) * | 2006-06-14 | 2007-12-19 | 宫志利 | Fuel coal desulfurizing method |
| CN102172469A (en) * | 2011-03-09 | 2011-09-07 | 浙江大学 | Composite flue gas purification additive for wet flue gas desulfurization system |
-
2016
- 2016-04-26 CN CN201610264045.9A patent/CN105854574A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101088592A (en) * | 2006-06-14 | 2007-12-19 | 宫志利 | Fuel coal desulfurizing method |
| CN102172469A (en) * | 2011-03-09 | 2011-09-07 | 浙江大学 | Composite flue gas purification additive for wet flue gas desulfurization system |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160817 |
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| RJ01 | Rejection of invention patent application after publication |