CN207493486U

CN207493486U - A kind of desulfurization of coke oven flue gas and de-dusting de-nitration integrated

Info

Publication number: CN207493486U
Application number: CN201721534964.XU
Authority: CN
Inventors: 杨文明; 张红兵; 张小军
Original assignee: SHANXI PROVINCIAL CHEMICAL DESIGN INSTITUTE
Current assignee: Shanghai Electric Group guokong Global Engineering Co.,Ltd.
Priority date: 2017-11-17
Filing date: 2017-11-17
Publication date: 2018-06-15
Anticipated expiration: 2027-11-17

Abstract

The utility model belongs to the environmental technology field of gas cleaning and the utilization of resources, desulfurization and de-dusting de-nitration integrated more particularly to a kind of coke oven flue gas, technical problem to be solved are to provide that a kind of applicability is wide, safe and reliable, feasibility is strong, denitrification efficiency is high, the escaping of ammonia rate is low, without discharging of waste liquid, the desulfurization for the coke oven flue gas that heat utilization ratio is high, operating cost is low 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 connects the desulfurization fume import of the de-dusting de-nitration integrated, the ammon entry hole of the de-dusting de-nitration integrated is connect with the ammonia-gas spraying device, and the analysis gas inlet of the de-dusting de-nitration integrated is connect with the analytical gas outlet of the hot-blast stove；The utility model is widely used in coke oven flue gas desulphurization denitration technical field.

Description

A kind of desulfurization of coke oven flue gas and de-dusting de-nitration integrated

Technical field

The invention belongs to the environmental technology fields of gas cleaning and the utilization of resources, and in particular to a kind of desulfurization of coke oven flue gas And de-dusting de-nitration integrated.

Background technology

The atmosphere pollution of coke oven smoke stack emission is the exhaust gas generated after coke-stove gas burning, mainly there is SO2, NOx and cigarette Dirt etc., pollutant are to pollute one of industry the most serious in overhead point source continuity discharge in a organized way.As country is to air The pay attention to day by day of pollution control, the improvement of coke oven flue gas pollutant are extremely urgent.Foundation《Coking chemistry emission of industrial pollutants Standard（GB16171-2012）》Regulation, from 1 day January in 2015, existing coal chemical enterprise need to perform particle concentration 30mg/m³、 Sulfur dioxide 50mg/m³, nitrogen oxides 500mg/m³Emission limit, according to this standard only have a small number of enterprises can be up to standard.Usually After desulfurization and dedusting, particulate matter and sulfur dioxide can reach discharge standard.But for " atmosphere pollution is especially arranged as defined in standard Put limit value ", coke oven chimney emission limits of nitrogen oxides is set in 150mg/m3, if existing and newly-built coke oven takes no action to, Flue gas can not qualified discharge.The improvement of coke oven flue gas should take off desulfurization under the premise of coke oven normal operation is not influenced as possible Nitre efficiency of dust collection meets the discharge standard of country and coking industry.

For existing coal-burning power plant SCR flue-gas denitration process mostly using high dirt arrangement, i.e. SCR reactors are arranged in boiler Between economizer and air preheater, the flue gas drawn from boiler economizer enters air preheater after SCR reactors.And Dust is mainly coal dust and burnt dirt in coking flue gas, and content is high, complicated component, according to high dirt arrangement, easily causes and urges Agent blocks, abrasion and alkali metal are poisoned, and blowing out can be caused when serious, causes heavy losses.

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 gas_XReaction, Generate N₂And H₂O realizes NO_XRemoving, and control NH₃Escapement ratio.More than 90% NOx is existed in the form of NO in flue gas.NH₃ Selectively and NO_XThe 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 NO_X；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.

Description of the drawings

The utility model is described further below in conjunction with the accompanying drawings.

Fig. 1 is the utility model structure chart.

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.

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.

Claims

1. desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas, it is characterised in that：Including rotary spraying and drying tower, remove Dirt denitrification integrated device, hot-blast stove, for ammonia device and main induced draft fan, the smoke inlet connection coke oven of the rotary spraying and drying tower Flue, the outlet flue of the rotary spraying and drying tower connects the desulfurization fume import of the de-dusting de-nitration integrated, described The ammon entry hole of de-dusting de-nitration integrated is connect with described for ammonia device, and the resolution gas of the de-dusting de-nitration integrated enters Mouthful connect with the analytical gas outlet of the hot-blast stove, the net mouth of the de-dusting de-nitration integrated be connected with main induced draft fan by Clean flue gas after desulphurization denitration is discharged from coke oven chimney.

2. desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas according to claim 1, it is characterised in that：Institute It states and is provided with flue gas distributor on rotary spraying and drying tower smoke inlet.

3. desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas according to claim 1, it is characterised in that：Institute It states and includes ammonia vaporizer and dilution air for ammonia device.

4. desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas according to claim 1, it is characterised in that：Institute It states and ammonia vapour/flue gas mixer is provided in de-dusting de-nitration integrated, the dedusting flue gas of bag-type dust is supplied into ammonia with described The ammonia vapour that device is sent into is sufficiently mixed, and mixed gas then is sent into denitration catalyst room carries out catalytic denitration.

5. desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas according to claim 1, it is characterised in that：Institute The parameter for stating 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.

6. desulfurization and the de-dusting de-nitration integrated of a kind of coke oven flue gas according to claim 1, it is characterised in that：Institute State parameter the exhaust gas volumn 150000Nm3/h, flue gas flow rate 1.1m/s, gas residence time 1.14S of rotary spraying and drying tower, desulfurization Tower diameter 7m, desulfurization tower height degree 13m, atomizer power 75kW.