A kind of desulfurization denitration method of system for desulfuration and denitration
It is to submit on December 3rd, 2013 application No. is 201310634675.7 the applying date that the application, which is, entitled
The divisional application of the Chinese invention patent application of system for desulfuration and denitration and its desulfurization denitration method.
Technical field
The invention belongs to desulphurization denitration technical fields, and in particular to a kind of system for desulfuration and denitration and its desulfurization denitration method.
Background technology
Widely used desulfurization and denitrification integral technology is mainly wet flue gas desulfurization and selective catalysis outside Now Domestic
Reduction or selective non-catalytic reduction technology denitration combination.The most commonly used is the calcium using lime or lime stone for wet flue gas desulfurization
Method, desulfuration efficiency is up to 90%, the drawback is that engineering is huge, initial cost and operating cost are high, and easily form secondary pollution.Choosing
When the catalytic-reduction denitrified reaction temperature of selecting property is 250~450 DEG C, denitration rate is up to 70%~90%.The technology maturation is reliable, mesh
Preceding especially developed country is widely used in the world, but the technological equipment investment is big, needs the pre-heat treatment flue gas, and catalyst is held high
Expensive and service life is short, exists simultaneously NH_3 leakage, the problems such as equipment is perishable.Selective non-catalytic reduction temperature region is 870
~1200 DEG C, denitration rate is less than 50%.The problems such as shortcoming is that technological equipment investment is big, needs the pre-heat treatment flue gas, and equipment is perishable.
And complex process, of high cost, operation difficulty is big, it is difficult to wide popularization and application.
Invention content
For above-mentioned deficiency, present invention aims at provide a kind of smart structural design, rationally, operating cost is low, no
It only realizes the effect of desulfurization and denitration, also limits the system for desulfuration and denitration of the escaping of ammonia discharge;
The object of the invention also resides in, and provides a kind of desulfurization denitration method of above-mentioned system for desulfuration and denitration, the work of this method
Skill step is simple, the problem of not only realizing the effect of desulfurization and denitration, also solve the escaping of ammonia, and efficient, energy conservation and environmental protection, into
This is low.
To achieve the above object, technical solution provided by the present invention is:
A kind of system for desulfuration and denitration, including a tower body, the lower part of the tower body is equipped with gas inlet, corresponding gas inlet
Lower position in being equipped with oxidation panel in the tower body, the top position of corresponding gas inlet in the tower body by from the bottom to top
Sequence be equipped with enriching section, absorber portion, purification washing section and demisting section successively.
As a modification of the present invention, the oxidation panel includes the oxidation air set gradually by sequence from the bottom to top
Distributor, gas-liquid distributor and partition board.
As a modification of the present invention, the enriching section includes cooling down by the accident that sequence from the bottom to top is set gradually
Spraying layer, secondary cycle liquid spraying layer and primary cycle liquid hydrops slot, the primary cycle liquid hydrops slot and the secondary cycle liquid
The pipeline of spraying layer is connected.
As a modification of the present invention, the absorber portion includes the primary cycle set gradually by sequence from the bottom to top
Liquid spraying layer one, primary cycle liquid spraying layer two, packing material absorbing layer and primary cycle liquid spraying layer three.
As a modification of the present invention, the purification washing section includes spraying by the water that sequence from the bottom to top is set gradually
Drenching layer, recirculated water spraying layer one, packing material absorbing layer and recirculated water spraying layer two.
As a modification of the present invention, the demisting section includes the demister one set gradually by sequence from the bottom to top
With demister two.
A kind of desulfurization denitration method of above-mentioned system for desulfuration and denitration, includes the following steps:
(1) bottom of the oxidation air through tower body enters in tower body, and oxidized section of gas-liquid distribution and balanced oxidation, will inhale
The ammonium sulfite solution for receiving section is fully oxidized to ammonium sulfate;
(2) ammonium sulfate squeezes into enriching section by the secondary cycle pump on secondary cycle liquid spraying layer, from enriching section
Top is distributed injection down, makes inversely to contact from the high-temperature flue gas that gas inlet is come in ammonium sulfate, moisture evaporation, from
And the density for increasing ammonium sulfate reaches saturation and forms crystallization, saturated solution enters primary cycle liquid hydrops slot, passes through
The crystallization pump of the primary cycle liquid hydrops slot squeezes into the cyclone of rear sulphur ammonium system, enters back into thickener, from thickener enter from
Scheming detaches, and is then refluxed for primary cycle liquid hydrops slot, and primary cycle liquid hydrops slot is connected with secondary cycle liquid spraying layer,
Clear liquid can overflow to secondary cycle liquid spray and carry out cyclic;
(3) absorber portion absorbs SO2The ammonia escaped with absorption part, while ammonium hydroxide is added first to absorb with lower part ammonium sulfite solution
SO2It mixes again with ammonium sulfate, flowing into enriching section, molten formation is completely recycled and absorbed altogether;
(4) purification washing section carries out absorption processing to the escape ammonia in flue gas;
(5) demisting section carries out demisting to flue gas.
As a modification of the present invention, after the oxidized air sparger of oxidation air, then through three layers of gas-liquid distributor into
The comprehensive balanced oxidation of row, ammonium sulfate is fully oxidized to by the ammonium sulfite solution of absorber portion.
As a modification of the present invention, the primary cycle liquid spraying layer one in the absorber portion is absorbed for fixed ammonification
Layer, for efficient absorption SO2;Primary cycle liquid spraying layer two and packing material absorbing layer are used for preventing the escaping of ammonia and absorb SO2;Level-one
Circulation fluid spraying layer three is used for preventing the escaping of ammonia.
As a modification of the present invention, the purification washing section carries out the escape ammonia in flue gas using purified water thorough
Absorption processing.
Beneficial effects of the present invention are:System for desulfuration and denitration smart structural design provided by the invention, rationally, each work(
Energy system combination becames one, while have the function of five sets, coordinates technique seven big system (process recycled water, ammonium hydroxide, oxidation, suction
Receipts, concentration, thiamines finished product system, demister system), form the system for desulfuration and denitration of complete set, efficiently solve operation into
The problem of this is high, and process stabilizing absorb, condensing crystallizing overall operation, and without any discharging of waste liquid, limitation the escaping of ammonia discharges,
It thoroughly solves the problems, such as the escaping of ammonia and aerosol, the import smog discharge temperature of 130-150 degree can be fallen below to 35 degree hereinafter, utilizing
Flue-gas temperature becomes finished product, not only saves water resource, also overcomes the discharge of the subtle objects of micronic dust PM2.5, substantially reduces
Operating cost, that is, ensure environment protecting, and turn waste into wealth.Desulfurization denitration method provided by the invention, processing step is simple,
The problem of not only realizing the effect of desulfurization and denitration, also solving the escaping of ammonia, and denitrification efficiency is high, energy conservation and environmental protection, cost
It is low, safe operation stablize the characteristics of, can realize turns waste into wealth, be from now on environment protection desulphurization develop emphasis direction.
With reference to the accompanying drawings and examples, the invention will be further described.
Description of the drawings
Fig. 1 is the structure diagram of the present invention.
Specific embodiment
Embodiment, referring to Fig. 1, a kind of system for desulfuration and denitration provided in this embodiment, including a tower body 1, the tower body 1
Lower part be equipped with gas inlet, the lower position of corresponding gas inlet in being equipped with oxidation panel 2 in the tower body 1, corresponding flue gas into
The top position of mouth is equipped with enriching section 3, absorber portion 4, purification washing section 5 successively in the interior sequence pressed from the bottom to top of the tower body 1
With demisting section 6.
The oxidation panel 2 includes the oxidation air distributor 21, the gas-liquid distributor that are set gradually by sequence from the bottom to top
22 and partition board 23.
The enriching section 3 includes the accident cooling spraying layer 31, the secondary cycle liquid that are set gradually by sequence from the bottom to top
Spraying layer 32 and primary cycle liquid hydrops slot 33, the pipe of the primary cycle liquid hydrops slot 33 and the secondary cycle liquid spraying layer 32
Road is connected.
The absorber portion 4 includes the primary cycle liquid spraying layer 1 set gradually by sequence from the bottom to top, level-one is followed
Ring liquid spraying layer 2 42, packing material absorbing layer 43 and primary cycle liquid spraying layer 3 44.Packing material absorbing layer 43 not only prevented the escaping of ammonia but also
Air-liquid can be made again uniformly distributed, make absorbing reaction more abundant.
The purification washing section 5 includes the water spray layer 51, the recirculated water spraying layer that are set gradually by sequence from the bottom to top
One 52, packing material absorbing layer 53 and recirculated water spraying layer 2 54.
The demisting section 6 includes the demister one set gradually by sequence from the bottom to top and demister two.
System for desulfuration and denitration smart structural design provided by the invention, rationally, exists the combination of ammonia method desulfurizing system entirety
One, while has the function of five sets, seven big system of cooperation technique (process recycled water, ammonium hydroxide, oxidation, absorption, concentration, thiamines into
Strain system, demister system), the system for desulfuration and denitration of complete set is formd, solve thes problems, such as that operating cost is high, and
Process stabilizing absorbs, condensing crystallizing overall operation, without any discharging of waste liquid, limitation the escaping of ammonia discharge, thoroughly solve the escaping of ammonia and
The import smog discharge temperature of 130-150 degree can be fallen below 35 degree hereinafter, becoming production using flue-gas temperature by aerosol problem
Finished product not only saves water resource, also overcomes the discharge of the subtle objects of micronic dust PM2.5, greatly reduces operating cost, that is, ensures
Environment protecting, and turn waste into wealth.
A kind of desulfurization denitration method of above-mentioned system for desulfuration and denitration, includes the following steps:
(1) bottom of the oxidation air through tower body 1 enters in tower body 1, and oxidized section 2 of gas-liquid distribution and balanced oxidation,
The ammonium sulfite solution of absorber portion 4 is fully oxidized to ammonium sulfate;Specifically, the oxidized air sparger 21 of oxidation air
Afterwards, then through three layers of gas-liquid distributor 22 comprehensive balanced oxidation is carried out, the ammonium sulfite solution of absorber portion 4 is fully oxidized to
Ammonium sulfate.Reasonable layout after its oxidation efficiency is designed by calculating, can reach more than 99.8%.
(2) ammonium sulfate squeezes into enriching section 3 by the secondary cycle pump on secondary cycle liquid spraying layer 32, from enriching section
3 top is distributed injection down, makes inversely to contact from the high-temperature flue gas that gas inlet is come in ammonium sulfate, moisture is steamed
Hair, so as to which the density for increasing ammonium sulfate reaches saturation and forms crystallization, saturated solution enters primary cycle liquid hydrops slot
33, the cyclone of rear sulphur ammonium system is squeezed by the crystallization pump of the primary cycle liquid hydrops slot 33, thickener is entered back into, from stiff
Device enters centrifuge separation, is then refluxed for primary cycle liquid hydrops slot 33, primary cycle liquid hydrops slot 33 and secondary cycle
Liquid spraying layer 32 be connected, clear liquid can overflow to secondary cycle liquid spray carry out cyclic, can successfully solve crystallisation problems,
Nozzle easily block and wash away, discharging problem.
(3) absorber portion 4 absorbs SO2The ammonia escaped with absorption part, while ammonium hydroxide is added first to inhale with lower part ammonium sulfite solution
Receive SO2It mixes again with ammonium sulfate, flowing into enriching section 3, molten formation is completely recycled and absorbed altogether;By the SO in flue gas2、NO2
Carry out quick absorbing reaction generation NH4NO3(NH4)2SO4, so as to achieve the purpose that desulphurization denitration;Wherein described absorber portion 4
In primary cycle liquid spraying layer 1 for fixed ammonification absorbed layer, for efficient absorption SO2;The fixed ammonification absorbed layer
Individually to ammoniate absorption cycle system, there is efficient absorption;Primary cycle liquid spraying layer 2 42 and packing material absorbing layer 43
For preventing the escaping of ammonia and absorbing SO2;Primary cycle liquid spraying layer 3 44 is used for preventing the escaping of ammonia.Increase primary cycle liquid spray
Layer 2 42 and primary cycle liquid spraying layer 3 44 can realize the mesh for absorbing control and reducing operating cost by flexibly controlling
's.When production need decrement when liquid-gas ratio can adjust, with electric control valve be automatically closed 2 42 He of primary cycle liquid spraying layer or
Primary cycle liquid spraying layer 3 44 keeps primary cycle liquid spraying layer 1 to spray injection, is allowed to fully inhale in effective height
Receipts reach vapor liquid equilibrium.Power consumption is reduced by the control of frequency conversion in this way, the escaping of ammonia is effectively controlled in the case of not impact effect.
(4) purification washing section 5 carries out absorption processing to the escape ammonia in flue gas;Specifically, the purification washing section 5 uses
Purified water carries out thorough absorption processing to the escape ammonia in flue gas.
(5) 6 pairs of flue gases of demisting section carry out demisting.Using the structure design of double-deck demister, i.e., including demister one and remove
Day with fog two, greatly promotes defogging effect.Demister one and demister two are rushed in hydro-peening with high pressure to be sprayed.
Desulfurization denitration method provided by the invention, processing step is simple, not only realizes the effect of desulfurization and denitration, also solves
The problem of the escaping of ammonia, and the characteristics of denitrification efficiency is high, and energy conservation and environmental protection is at low cost, and safe operation is stablized, can realize to become and give up
It is the emphasis direction of environment protection desulphurization development from now on for treasured.
Specifically, the invention has the advantages that:
1st, each function system will be integrated and became one, while there are five sets, and coordinate seven big system (technique of technique
Recirculated water, ammonium hydroxide, oxidation, absorption, concentration, thiamines finished product system, demister system), form the desulphurization denitration system of complete set
System.
2nd, solve the problems, such as that operating cost is high.Process stabilizing absorbs, condensing crystallizing overall operation, no any waste liquid row
It puts, limitation the escaping of ammonia discharge.
3rd, the escaping of ammonia and aerosol thoroughly are solved the problems, such as.
4th, the purpose for realize the treatment of wastes with processes of wastes against one another, turning waste into wealth.
5th, it can effectively control cost run, power consumption, water consume, ammonia are consumed, can rationally control, effectively reduce cost.
6th, the qualified discharge of PM2.5 is thoroughly realized.
7th, the import smog discharge temperature of 130-150 degree falls below 35 degree hereinafter, become finished product using flue-gas temperature,
Water resource is saved, overcomes the discharge of the subtle objects of micronic dust PM2.5, operating cost is greatly reduced, that is, ensures environment protecting,
Turn waste into wealth again, be the emphasis direction of environment protection desulphurization development from now on.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, the invention is not limited in specific embodiment disclosed and described above, to the present invention's
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, it although is used in this specification
Some specific terms, but these terms are merely for convenience of description, do not limit the present invention in any way.Such as the present invention
Described in above-described embodiment, using other system and method obtained from same or similar structure, model is protected in the present invention
In enclosing.