Utility model content
The utility model intends to solve the technical problem by providing a kind of applicability is wide, safe and reliable, feasibility is strong, desulfurization takes off
Nitre is efficient, the escaping of ammonia rate is low, desulfurization and dedusting without discharging of waste liquid, the coke oven flue gas that heat utilization ratio is high, operating cost is low
Denitrification integrated device.
In order to solve the above-mentioned technical problem, technical solution is used by the utility model:A kind of desulfurization of coke oven flue gas
And de-dusting de-nitration integrated, including rotary spraying and drying tower, de-dusting de-nitration integrated, hot-blast stove, for ammonia device and
Main induced draft fan, the smoke inlet connection coke oven flue of the rotary spraying and drying tower, the outlet flue of the rotary spraying and drying tower connect
Connect the desulfurization fume import of the de-dusting de-nitration integrated, the ammon entry hole of the de-dusting de-nitration integrated and the confession
Ammonia device connects, and the analysis gas inlet of the de-dusting de-nitration integrated is connect with the analytical gas outlet of the hot-blast stove, institute
State de-dusting de-nitration integrated net mouth be connected with main induced draft fan by the clean flue gas after desulphurization denitration from coke oven chimney arrange
Go out.
Flue gas distributor is provided on the rotary spraying and drying tower smoke inlet.
It is described to include ammonia vaporizer and dilution air for ammonia device.
Ammonia vapour/flue gas mixer is provided in the de-dusting de-nitration integrated, by the dedusting flue gas of bag-type dust
It is sufficiently mixed with the ammonia vapour being sent into for ammonia device, mixed gas then is sent into denitration catalyst room carries out catalytic denitration.
The parameter of the main induced draft fan is exhaust gas volumn 150000Nm3/ h, 250 DEG C of flue-gas temperature, fan delivery 300000m3/
H, fan pressure head 4500Pa, power of motor 800kW.
The parameter exhaust gas volumn 150000Nm3/h of the rotary spraying and drying tower, flue gas flow rate 1.1m/s, gas residence time
1.14S, desulfurizing tower diameter 7m, desulfurization tower height degree 13m, atomizer power 75kW.
As described above, the utility model has the advantages that compared with prior art.
1st, the present invention removes the particulate matter for being stained with the goos such as tar from coke oven flue gas, so as to effectively protect denitration
Catalyst, guarantee system can for a long time, stablize, safely run.
2nd, when coke oven carries out heating commutation, sulfur dioxide, oxynitrides in exhaust gas volumn and flue gas, dust concentration are equal
There is fluctuation, the desulphurization denitration treatment process that this programme uses has very strong adaptive ability, can meet different operating mode pollutions
The coke oven flue gas process demand of object concentration, device front end coke oven main chimney flue flue gas, which takes, is provided with pneumatic control valve door at wind point,
Can control valve be interlocked according to main chimney flue pressure.
3rd, dedusting before denitration reduces abrasion of the dust in flue gas when by denitration catalyst oxidant layer to catalyst surface,
The service life of denitrating catalyst can effectively be extended, reduce the dosage of denitrating catalyst, while can be omitted traditional
Catalyst soot cleaning system.
4th, ammonia thermal decomposition integrated structure type is sprayed using dedusting denitration, utilizes dedusting filtering bag filter layer and current equalizing structure body
Current balance function realizes flue gas being evenly distributed on denitrating catalyst cross section, makes velocity of flue gas field, thermo parameters method more uniform,
Further improve denitration efficiency.
5th, flue gas first passes through desulfurization process, the SO when entering catalytic denitration2Content is extremely low.Can effectively it inhibit in denitrification process
The production quantity of ammonium hydrogen sulfate prevents ammonium hydrogen sulfate from being condensed when flue-gas temperature is reduced to below 230 DEG C and is attached on catalyst table
Face reduces denitrating catalyst denitration efficiency.Whole process flue-gas temperature is significantly larger than aqueous dew point temperature and acid dew-point temperature always, because
This will not generate corrosion phenomenon.
6th, the solid waste main ingredient that the present invention generates is CaSO3、CaSO4Innocuous substances are waited, environment will not be caused to endanger
Evil.CaSO3As hemihydrate CaSO3•1/2H2O exists, and when being contacted with air and moisture, hemihydrate gradually changes
For CaSO4•2H2O.At 380 DEG C to 410 DEG C, it releases its crystallization water, temperature be more than 600 DEG C when it be decomposed into again CaO and
SO2.Contained unreacted CaO and Ca (OH) in Desulphurization2It can make desulfurization grey induration, with CO in air2Reaction generation stabilization
CaCO3.The alkalinity and scleroma property of Desulphurization are to preventing stacking field underground water pollution from having very big help.The alkalinity of Desulphurization makes its heavy
Metal is not easy to be precipitated, and characteristic of hardening is so that the impermeable characteristic for stacking layer bottom is greatly improved.In America and Europe, the ring of many countries
Guarantor department ratifies the Desulphurization air storage of dry desulfurization.
First, technological principle of the invention
1.1 SDA tower semi-dry desulphurization principles
Former flue gas enters SDA towers by flue gas distributor, and the sulfur dioxide in fluidised material and flue gas is in desulfurizing tower
In with tiny lime slurry(50 microns of average droplet size)It chemically reacts, the acidic components in flue gas are tiny rapidly
Research and development drop neutralize.Meanwhile moisture therein is also evaporated, and rationally controls smoke distribution, slurry flow and drop size, with
Ensure that drop is dried before spray dry absorbingatreatingastep tower tower wall is contacted.
A part of desciccate including flying dust and absorbing reaction product, falls into absorb the bottom of the tower, into dust delivery system
System.The flue gas that reaction is completed in tower enters bag filter, and solid particle is collected.
When atomized water is atomized, and come into full contact with flue gas by reverse-flow type atomizer in desulfurizing tower, flue gas cools down simultaneously
Humidification, the same H of calcium hydroxide powder particles2O、SO2、H2SO3Reaction generation dry-powder product, entire reaction are divided into gas phase, liquid phase and solid phase
Three kinds of state responses, reaction step and equation are as follows:
(1)SO2 is by drop absorption;SO2(gas)+H2O→H2SO3(liquid);
(2)The SO of absorption2With the absorbent slaked lime powder reaction generation calcium sulfite of solution;
Ca(OH)2(liquid)+H2SO3(liquid) → CaSO3(liquid)+2H2O;
Ca(OH)2(Gu)+H2SO3(liquid) → CaSO3(liquid)+2H2O;
(3)CaSO in drop3After reaching saturation, that is, start crystallization and be precipitated;CaSO3(liquid) → CaSO3(Gu);
(4)CaSO in part solution3It is reacted with the oxygen being dissolved in drop, is oxidized to calcium sulfate, CaSO3(liquid)+1/2O2
(liquid) → CaSO4(liquid);
(5)CaSO4(liquid) solubility is low, is precipitated so as to crystallize;CaSO4(liquid) → CaSO4(Gu).
1.2 denitration principles
Dedusting denitration unit is with ammonia (NH3) for reducing agent, under low-temperature SCR catalyst effect with the NO in flue gasXReaction,
Generate N2And H2O realizes NOXRemoving, and control NH3Escapement ratio.More than 90% NOx is existed in the form of NO in flue gas.NH3
Selectively and NOXThe N of reaction generation non-secondary pollution2And H2O is with flue gas emission.
Former flue gas enters SDA towers by flue gas distributor, and the acidic components in flue gas are rapidly by tiny research and development drop
With.Meanwhile moisture therein is also evaporated, a part of desciccate, including flying dust and absorbing reaction product, falls into absorption tower bottom
Portion, into dust transport system.The flue gas that reaction is completed in tower enters bag filter, and solid particle is collected.
The flue-gas temperature after desulfurization and dedusting is completed to control at 180-200 DEG C.Into de-dusting de-nitration integrated, flue gas
First through bag-type dust in de-dusting de-nitration integrated, the flue gas after dedusting and the reducing agent for ammonia device addition(Ammonia)It fills
Divide mixing.Mixed flue gas enters denitration catalyst oxidant layer, and denitration reaction occurs under catalyst action, removes NOX;After purification
Clean flue gas pass through smoke stack emission.Coal gas hot-blast stove by de-dusting de-nitration integrated is set, periodically catalyst is carried out
On-line heating is, it can be achieved that the active regeneration of catalyst.
Inventive desulfurization unit includes:SDA towers, slurrying unit, loop slurry unit.Dedusting denitration unit is removed including denitration
Dirt integrated apparatus, hot-blast stove, ammonia unit.When low-temperature SCR catalyst service life is 24000, design denitration efficiency is not small
In 85%.Flue gas air heating furnace regenerates 1 time every year according to operating condition, about 10h/ of each recovery time storehouse.Ammonia unit is vaporized by ammonia
Device, dilution air, ammonia/flue gas gaseous mixture form, and ammonium hydroxide pumping ammonia vaporizer is evaporated to ammonia vapour in ammonia vessel, through outside line pipeline
It send to ammonia/flue gas mixer;Clean flue gas after main air blower is sent ammonia/flue gas mixer that the two is fully mixed by dilution air
It closes, imports in Benitration reactor.
Specific embodiment
As shown in Figure 1, desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas, including rotary spraying and drying tower,
De-dusting de-nitration integrated, hot-blast stove, for ammonia device and main induced draft fan, the smoke inlet connection of the rotary spraying and drying tower is burnt
Stove flue, the outlet flue of the rotary spraying and drying tower connect the desulfurization fume import of the de-dusting de-nitration integrated, institute
The ammon entry hole for stating de-dusting de-nitration integrated is connect with described for ammonia device, the resolution gas of the de-dusting de-nitration integrated
Entrance is connect with the analytical gas outlet of the hot-blast stove, and the net mouth of the de-dusting de-nitration integrated is connected with main induced draft fan
Clean flue gas after desulphurization denitration is discharged from coke oven chimney.
Flue gas distributor is provided on the rotary spraying and drying tower smoke inlet.
It is described to include ammonia vaporizer and dilution air for ammonia device.
Ammonia vapour/flue gas mixer is provided in the de-dusting de-nitration integrated, by the dedusting flue gas of bag-type dust
It is sufficiently mixed with the ammonia vapour being sent into for ammonia device, mixed gas then is sent into denitration catalyst room carries out catalytic denitration.
The parameter of the main induced draft fan is exhaust gas volumn 150000Nm3/ h, 250 DEG C of flue-gas temperature, fan delivery 300000m3/
H, fan pressure head 4500Pa, power of motor 800kW.
The parameter exhaust gas volumn 150000Nm3/h of the rotary spraying and drying tower, flue gas flow rate 1.1m/s, gas residence time
1.14S, desulfurizing tower diameter 7m, desulfurization tower height degree 13m, atomizer power 75kW.
The merely exemplary principle and its effect for illustrating the utility model of the above embodiment is new not for this practicality is limited
Type.Person skilled in the art can all repair above-described embodiment under the spirit and scope without prejudice to the utility model
Decorations improve.Therefore, all lift in the technical field has usually intellectual without departing from the revealed spirit of the utility model
With all equivalent modifications completed under technological thought or change, should be covered by the claim of the utility model.