CN101554561B - Technical method for combining deamination and desulfurization - Google Patents

Technical method for combining deamination and desulfurization Download PDF

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Publication number
CN101554561B
CN101554561B CN2009100512047A CN200910051204A CN101554561B CN 101554561 B CN101554561 B CN 101554561B CN 2009100512047 A CN2009100512047 A CN 2009100512047A CN 200910051204 A CN200910051204 A CN 200910051204A CN 101554561 B CN101554561 B CN 101554561B
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desulfurization
deamination
unit
ammonia
gas
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CN101554561A (en
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李同军
王增忱
王燕霞
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Baosteel Engineering and Technology Group Co Ltd
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Baosteel Engineering and Technology Group Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention relates to a technical method for combining deamination and desulfurization, comprising a deamination unit, a desulfurization unit and a post-treatment unit of sulfur and amino; strong ammonia water generated by the deamination unit is delivered into a desulfurization unit by a pipeline; and desulfurization liquid of the desulfurization unit is delivered into the post-treatment unit of sulfur and amino by a pipeline. The deamination unit adopts a phosphoric acid absorbing method to remove amino in rich-amino gas in an amino-absorbing system, and the gas is delivered after becoming deamination gas; deamination rich liquor in a desorption system generates barren liquor and strong ammonia water by desorption; the barren liquor is used for deamination circularly; and the strong ammonia water is used for desulfurization. In the desulfurization unit, sulfur dioxide in gas with high content of sulfur is absorbed and removed and the gas is delivered after becoming desulfurizationgas; desulfurization liquor generated by desulfurization is used by two paths circularly. The post-treatment unit of sulfur and amino oxidizes ammonium sulfite in the desulfurization liquor into ammo nium sulfate. The new technique is energy-saving and environment-friendly, reduces operation cost of environmental protection projects, treats waste by waste, changes waste into valuable and realizes recycling economic operation.

Description

The process of combining deamination and desulfurization
Technical field
The present invention relates to chemical gases deamination and desulfurization field, particularly a kind of ammonia that absorbs in rich ammonia gas such as coke-stove gas and the ammonia still process gas is produced concentrated ammonia liquor, and concentrated ammonia liquor then is used for the process of the combining deamination and desulfurization of rich sulphur gas such as sintering flue gas desulfurization.
Background technology
China is to be the energy-consuming big country of raw material with the coal, and along with the raising of process of urbanization and people's living standard, the consumption of the energy constantly increases, and produces a large amount of high sulphur-containing exhaust gas in the energy resource consumption process; China is iron and steel output and consumption first big country in the world still, has a large amount of high sulphur-containing exhaust gas to produce in steel manufacture process, and these high sulphur-containing exhaust gas need carry out just entering atmosphere after the desulfurization.
The sulphur that removes at present in the flue gas has a lot of methods, and ammonia type flue gas desulfurizing wherein is high and do not have advantage such as secondary pollution deposits yields and be a dark horse to have desulfuration efficiency, but exists ammonia source instability, shortcoming such as price is high and sulphur ammonia quality that generated is low.
Summary of the invention
At above-mentioned existing in prior technology problem, task of the present invention provides a kind of process of combining deamination and desulfurization, produce concentrated ammonia liquor by the ammonia that absorbs in the rich ammonia gas (coke-stove gas and ammonia still process gas), concentrated ammonia liquor is used for high sulfurous gas (sinter fume) desulfurization, both removed the ammonia in the industrial gasses, generate concentrated ammonia liquor again, produced economic benefit.
Technical solution of the present invention is as follows:
A kind of process of combining deamination and desulfurization, it comprises deamination unit, desulfurization unit and sulphur ammonia post-processing unit, between deamination unit and the desulfurization unit, be connected by pipeline respectively between desulfurization unit and the sulphur ammonia post-processing unit, the concentrated ammonia liquor that the deamination unit produces is sent into desulfurization unit by pipeline, and the doctor solution of desulfurization unit is sent into sulphur ammonia post-processing unit by pipeline;
The deamination unit is made up of ammonia absorption system and desorption system two parts, connect by pipeline between these two parts, send after in the ammonia absorption system, adopting the phosphoric acid absorption process to remove the ammonia in the rich ammonia gas and become deamination gas, the deamination rich solution produces lean solution and concentrated ammonia liquor through desorb in desorption system, lean solution is recycled and is used for deamination, and concentrated ammonia liquor is used for desulfurization;
Desulfurization unit is made up of induced draught system and desulphurization system two parts, connects by flue between these two parts, and high sulfurous gas is introduced into desulphurization system, and the sulfur dioxide in this high sulfurous gas is absorbed to remove and sends after becoming processed gas; The doctor solution that desulfurization produces divides two-way to recycle, and wherein desulfurization is sprayed at one tunnel middle part of delivering to desulphurization system, and wherein sprinkling desulfurization is afterwards mixed on the top of delivering to desulphurization system, another road with concentrated ammonia liquor; Sub-fraction doctor solution in the doctor solution is sent into sulphur ammonium post-processing unit;
Sulphur ammonium post-processing unit is made up of blower system, oxidation precipitation system, filtration system, crystallization concentration systems and dry packing system, be connected by pipeline between them, blower system is sent into air in the doctor solution of oxidation precipitation system, sulfite oxidation in the doctor solution is become the sulphur ammonium, rare ammonium sulfate solution is sent into filtration system after removing heavy solid impurity through precipitation, ammonium sulfate solution is at the further filtering solid impurity of filtration system, clean ammonium sulfate solution concentrate through crystallization and dry packing after transport outward.
In the deamination process, need phosphoric acid is replenished.
The key component of doctor solution is ammonium sulfite, sulphur ammonium and water.
The present invention particularly in steel plant, produces concentrated ammonia liquor with the ammonia that absorbs in the rich ammonia gas (coke-stove gas and ammonia still process gas) owing to adopted above technical scheme, and concentrated ammonia liquor then is used for high sulfurous gas (sinter fume) desulfurization.Adopt the energy-conserving and environment-protective new technology of combining deamination and desulfurization of the present invention, changed the negative output situation of economy that the traditional sulfuric acid in coke-oven plant is washed ammonia process, a large amount of quantity that reduce because of sintering flue gas ammonia method desulfurizing outsourcing anhydrous ammonia, reduced the operating cost of environmental protection project, the treatment of wastes with processes of wastes against one another, turn waste into wealth, realized the recycling economy operation.
The process of combining deamination and desulfurization of the present invention is particularly suitable for existing rich ammonia gas has high sulfur-containing smoke gas to need the steel plant of desulfurization to use again.
Description of drawings
Accompanying drawing is the flow chart of the process of a kind of combining deamination and desulfurization of the present invention.
Drawing reference numeral:
1 is the ammonia absorption system, and 2 is desorption system, and 3 is induced draught system, and 4 is desulphurization system, and 5 is blower system, and 6 is the oxidation precipitation system, and 7 is filtration system, and 8 are the crystallization concentration systems, and 9 is the dry packing system.
The specific embodiment
Below in conjunction with accompanying drawing a preferred embodiment of the present invention is described in detail.
Referring to accompanying drawing, represented among the figure that the process system of a kind of combining deamination and desulfurization of the present invention is made up of deamination, desulfurization and three unit of sulphur ammonia post processing, three unit with dashed lines are divided.
Between deamination unit and the desulfurization unit, be connected by pipeline respectively between desulfurization unit and the sulphur ammonia post-processing unit, the concentrated ammonia liquor that the deamination unit produces is sent into desulfurization unit by pipeline, and the doctor solution of desulfurization unit is sent into sulphur ammonia post-processing unit by pipeline.
The deamination unit is made up of ammonia absorption system 1 and desorption system 2 two parts, connects by pipeline between these two parts.Rich ammonia gas enters ammonia absorption system 1 in the deamination unit, and employing phosphoric acid absorption process removes the ammonia in the rich ammonia gas in ammonia absorption system 1, and the gas behind the deamination is sent, and the solution that has absorbed ammonia is called as the deamination rich solution, and the deamination rich solution is sent into desorption system 2; In desorption system 2, the ammonia in the deamination rich solution is desorbed produces deamination lean solution and concentrated ammonia liquor, and the deamination lean solution is admitted to ammonia absorption system 1, and the deamination lean solution is recycled and is used for deamination, and concentrated ammonia liquor is sent into desulphurization system 4 and is used for desulfurization.Phosphoric acid is lossy in the deamination process, need carry out small amount of supplemental.
Desulfurization unit is made up of induced draught system 3 and desulphurization system 4 two parts, connects by flue between these two parts.Send into desulphurization system 4 at the high sulfurous gas of desulfurization unit by induced draught system 3, at the sulfur dioxide that desulphurization system 4 adopts in the high sulfurous gas of ammonia process absorbing and removing, the gas after the desulfurization is sent.The key component of the doctor solution that desulfurization produces is ammonium sulfite, sulphur ammonium and water.Doctor solution divides two-way to recycle, and wherein one the tunnel delivers to desulphurization system 4 and for example sprays desulfurization in the middle part of desulfurizing tower, and wherein another road is delivered to desulphurization system 4 and for example mixed sprinkling desulfurization afterwards with concentrated ammonia liquor from desorption system 2 in the top of desulfurizing tower.Sub-fraction doctor solution in the doctor solution is sent into the oxidation precipitation system 6 of sulphur ammonium post-processing unit.
Sulphur ammonium post-processing unit is made up of blower system 5, oxidation precipitation system 6, filtration system 7, crystallization concentration systems 8 and dry packing system 9, is connected by pipeline between them.Blower system 5 is sent into air in the doctor solution of oxidation precipitation system 6, sulfite oxidation in the doctor solution is become the sulphur ammonium, rare ammonium sulfate solution is sent into filtration system 7 after removing the bigger solid impurity of proportion through precipitation, ammonium sulfate solution is at filtration system 7 further filtering solid impurities, deslagging is to sintering system, clean ammonium sulfate solution is sent into crystallization concentration systems 8, making ammonium sulfate solution be able to crystallization concentrates, filtrate is sent into desulphurization system 4, sulphur ammonium after crystallization concentrates is sent into dry packing system 9 and is carried out drying and packing, at last the entrucking of finished product sulphur ammonium is transported outward.
Adopt the process of combining deamination and desulfurization of the present invention, can be energy-conserving and environment-protective and make contributions, reduced the operating cost of environmental protection project simultaneously, the treatment of wastes with processes of wastes against one another, turn waste into wealth, realized the optimum operation of recycling economy.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.

Claims (2)

1. the process of a combining deamination and desulfurization, it is characterized in that, it comprises deamination unit, desulfurization unit and sulphur ammonia post-processing unit, between deamination unit and the desulfurization unit, be connected by pipeline respectively between desulfurization unit and the sulphur ammonia post-processing unit, the concentrated ammonia liquor that the deamination unit produces is sent into desulfurization unit by pipeline, and the doctor solution of desulfurization unit is sent into sulphur ammonia post-processing unit by pipeline; The key component of doctor solution is ammonium sulfite, sulphur ammonium and water;
The deamination unit is made up of ammonia absorption system and desorption system two parts, connect by pipeline between these two parts, in the ammonia absorption system, adopt the phosphoric acid absorption process remove rich ammonia gas be the ammonia in coke-stove gas and the ammonia still process gas and become deamination gas after send, the solution that has absorbed ammonia is called as the deamination rich solution, the deamination rich solution is sent into desorption system, the deamination rich solution produces lean solution and concentrated ammonia liquor through desorb in desorption system, and lean solution is recycled and is used for deamination, and concentrated ammonia liquor is used for desulfurization;
Desulfurization unit is made up of induced draught system and desulphurization system two parts, connects by flue between these two parts, and high sulfurous gas is introduced into desulphurization system, and the sulfur dioxide in this high sulfurous gas is absorbed to remove and sends after becoming processed gas; The doctor solution that desulfurization produces divides two-way to recycle, and wherein desulfurization is sprayed at one tunnel middle part of delivering to desulphurization system, and wherein sprinkling desulfurization is afterwards mixed on the top of delivering to desulphurization system, another road with concentrated ammonia liquor; Sub-fraction doctor solution in the doctor solution is sent into sulphur ammonium post-processing unit;
Sulphur ammonium post-processing unit is made up of blower system, oxidation precipitation system, filtration system, crystallization concentration systems and dry packing system, be connected by pipeline between them, blower system is sent into air in the doctor solution of oxidation precipitation system, sulfite oxidation in the doctor solution is become the sulphur ammonium, rare ammonium sulfate solution is sent into filtration system after removing heavy solid impurity through precipitation, ammonium sulfate solution is at the further filtering solid impurity of filtration system, clean ammonium sulfate solution concentrate through crystallization and dry packing after transport outward.
2. the process of combining deamination and desulfurization according to claim 1 is characterized in that, needs phosphoric acid is replenished in the deamination process.
CN2009100512047A 2009-05-14 2009-05-14 Technical method for combining deamination and desulfurization Active CN101554561B (en)

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Publication number Priority date Publication date Assignee Title
CN101991989B (en) * 2010-10-21 2013-04-24 武汉钢铁(集团)公司 Crystallization bypass filtering method and device in single tower
CN102101006B (en) * 2011-01-21 2013-08-28 内蒙古庆华集团庆华煤化有限责任公司 Process for removing SO2 in smoke from boiler of coking plant by utilizing residual coked ammonia water
CN102527212B (en) * 2011-12-07 2013-08-28 南京钢铁股份有限公司 Comprehensive treating method and system for tail gas in ammoniac tank of coke-oven plant
CN102580475A (en) * 2012-02-17 2012-07-18 宣化钢铁集团有限责任公司 Method for recycling sulfuric acid tail gas in gas purification AS desulfurization process
CN103432834B (en) * 2013-09-05 2015-12-23 北京雪迪龙科技股份有限公司 A kind of smoke processing system and ammonium salt filter thereof
CN104709954B (en) * 2015-03-25 2016-08-17 山东钢铁股份有限公司 Flue gases of cock oven waste heat ammonia still process desulphurization integrated system
CN109266399A (en) * 2018-09-30 2019-01-25 垣曲县五龙镁业有限责任公司 Coke oven gas desulfurization deamination integral purifying device and method

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