CN106823717B - A kind of coke oven flue gas comprehensive treatment system - Google Patents

A kind of coke oven flue gas comprehensive treatment system Download PDF

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Publication number
CN106823717B
CN106823717B CN201710058486.8A CN201710058486A CN106823717B CN 106823717 B CN106823717 B CN 106823717B CN 201710058486 A CN201710058486 A CN 201710058486A CN 106823717 B CN106823717 B CN 106823717B
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flue gas
coke oven
comprehensive treatment
oven flue
storage tank
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CN106823717A (en
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姚俊新
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Hubei Weitian Environment Protection Technology Co Ltd
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Hubei Weitian Environment Protection Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/06Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/08Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/14Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/507Sulfur oxides by treating the gases with other liquids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/73After-treatment of removed components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • B01D2251/106Peroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The present invention relates to flue gases of cock oven processing technology fields, and in particular to a kind of coke oven flue gas comprehensive treatment system.A kind of coke oven flue gas comprehensive treatment system, including waste heat steam boiler, blower fan system, system for desulfuration and denitration, by-product processing system and power-supply system.Its advantage is that: the discharge standard of the coke oven flue gas comprehensive treatment system provided by the invention treated flue gases of cock oven can reach " coking chemistry emission of industrial pollutants standard " table six, 30 milligrams/standard cubic meter of sulfur dioxide (SO2) emissions i.e. in coke oven flue gas, 150 milligrams/standard cubic meter of discharged nitrous oxides, granular material discharged 15 milligrams/standard cubic meter;While output is for the steam and nitre sulphur ammonium complex salt of industrial application, nitre sulphur ammonium complex salt is that high-nitrogen compound fertilizer can be sold, so that being greater than equipment operating cost obtained by the output of the system, while being generated without any ' three wastes ', creates good economic benefit and social benefit.

Description

A kind of coke oven flue gas comprehensive treatment system
Technical field
The present invention relates to flue gases of cock oven processing technology fields, and in particular to a kind of coke oven flue gas comprehensive treatment system.
Background technique
In recent years, China's atmosphere pollution gets worse PM2.5/PM10 pollution, haze weather has become the coke of everybody concern Point.The newly execution of " environmental law ", " per diem punishment, no ceiling ", law enforcement for environmental protection dynamics will be increased unprecedentedly!Environmental protection Requirement further increase.As disposal of pollutants rich and influential family, the environmental problem of coking industry is had been a concern.According to country's " refining Coking emission of industrial pollutants standard " the management requirement implemented step by step, from January 1st, 2015, coking industry started to execute New Pollutant emission concentration limit value requirement.After by 2 year transitional period, existing coal chemical enterprise was from January 1st, 2017 Start to execute tightened up pollutant emission limit requirement, i.e., 30 milligrams/standard cubic meter of sulfur dioxide (SO2) emissions in coke oven flue gas, 150 milligrams/standard cubic meter of discharged nitrous oxides, granular material discharged 15 milligrams/standard cubic meter.
There are no a kind of economic, reliable desulfurizing and denitrifying process to be applied to production in practice for coking industry at present, exploitation one The device that kind is utilized for the desulphurization denitration of coke oven flue exhaust gas and recuperation of heat and by-product recovery is very necessary.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of coke oven flue gas comprehensive treatment system, coke oven tail gas is passing through GB16171-2012 " coking chemistry emission of industrial pollutants standard " table can be reached after the coke oven flue gas comprehensive treatment system Six discharge standard, while being greater than equipment operating cost obtained by the output of whole system, and generate without any ' three wastes ', it creates Good economic benefit and social benefit.
The technical solution adopted in the present invention is as follows:
A kind of coke oven flue gas comprehensive treatment system, including power-supply system, dioxygen water storage tank, tank used for storing ammonia, technique water storage tank, Waste heat steam boiler, blower fan system and system for desulfuration and denitration;The system for desulfuration and denitration by level-one Benitration reactor, desulfurizing tower and Second level Benitration reactor composition;The waste heat steam boiler, the blower fan system, the level-one Benitration reactor, the desulfurization Tower and the second level Benitration reactor are sequentially connected;
The level-one Benitration reactor is connected with the dioxygen water storage tank and inside is equipped with vortex reactor, and the level-one is de- Nitre reactor is connect by runner with the desulfurization tower bottom, and the runner is inverted U runner and flow channel cross-section is gradually reduced;
The top side of the desulfurizing tower is separately connected the dioxygen water storage tank and the tank used for storing ammonia;In the desulfurizing tower It is equipped with filler buffer layer and mesh mist eliminator from the bottom to top;The bottom and top of the desulfurizing tower are connected by circulating pump;
The second level Benitration reactor is located above the desulfurizing tower, and tube bank dedusting is equipped in the second level Benitration reactor Demister and lye nozzle, the lye nozzle are connect with the technique water storage tank, and the technique water storage tank stores coking The waste ammonia liquor that system generates.
Based on the above technical solution, the present invention can also improve as follows:
Optionally, the filler buffer layer is shared two layers and is arranged at intervals in the desulfurizing tower, the filler buffer layer Including filler and support plate, the filler by huddle or whole block in a manner of be placed on the support plate.In the desulfurizing tower also Equipped with vortex gas distributor, the vortex gas distributor is located at below the filler buffer layer.
Optionally, it is equipped with water conservancy diversion ring flat-plate and flusher in the tube bank dedusting demister, is additionally provided with from top to bottom First vortex leaf fan, second eddy current leaf fan and third vortex leaf fan, the water conservancy diversion ring flat-plate are located at second eddy current leaf fan and third whirlpool It flows between leaf fan;The tube bank dedusting demister side is equipped with exhanst gas outlet, and the smoke outlet is equipped with water fender.
Optionally, level-one Benitration reactor bottom connects the circulating pump by desulfurization metering pump;The desulfurizing tower Tower bottom is used for the diluted acid storage tank of by-product recovery by the connection of jet flow branch pipe.
It optionally, further include by-product processing system, the by-product processing system includes sequentially connected sulphur ammonia reaction Device, vapo(u)rization system and for being separated by solid-liquid separation, the separator of dehydration;The sulphur ammonia reactor respectively with the diluted acid storage tank and institute Tank used for storing ammonia connection is stated, vapo(u)rization system connect with the steam (vapor) outlet of the waste heat steam boiler and passes through steam for heating.
Wherein, the vapo(u)rization system includes steam heater, evaporates separation chamber, condenser and evaporative recirculation pump;The steaming Hair separation chamber is separately connected the sulphur ammonia reactor and the condenser, and the evaporative recirculation pump is separately connected the evaporation separation Room and the steam heater.Wherein, the separator includes sequentially connected cyclone feed pump, cyclone and centrifugation Machine, the cyclone feed pump are connect with the evaporation separation chamber.
It optionally, further include the standby power system and standby fan for having full-automatic startup function, the backup power source System is connect with the entire coke oven flue gas comprehensive treatment system, and the standby fan is equipped with backup power source.
It optionally, further include the DCS control system that the coke oven flue gas comprehensive treatment system is monitored and operated.
Compared with prior art, the advantages and benefits of the present invention are:
(1) system for desulfuration and denitration of the invention is made of level-one Benitration reactor, desulfurizing tower and second level Benitration reactor, whole A system for desulfuration and denitration is designed by reasonable connection relationship and internal special structure so that coke oven tail gas can reach after passing through To the discharge standard of GB16171-2012 " coking chemistry emission of industrial pollutants standard " table six, i.e. sulfur dioxide in coke oven flue gas 30 milligrams/standard cubic meter, 150 milligrams/standard cubic meter of discharged nitrous oxides are discharged, granular material discharged 15 milligrams/standard is stood Square rice.
(2) of the invention entirely to make an investment in 20 yuan/ton of burnt left and right, due to fully utilizing the thermal energy of waste heat steam boiler and taking off For the by-product output of sulphur denitrating system for the steam and nitre sulphur ammonium complex salt of industrial application, nitre sulphur ammonium complex salt is that high nitrogen is compound Fertilizer can be sold, so that it is greater than equipment operating cost obtained by the output of the system, while whole process is generated without any ' three wastes ', Create good economic benefit and social benefit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the coke oven flue gas comprehensive treatment system;
Fig. 2 is the structural schematic diagram of the tube bank dedusting demister;
1- waste heat steam boiler, 2- blower fan system, 3- power-supply system, 4- level-one Benitration reactor, 41- runner, 5- desulfurization Tower, 51- filler buffer layer, 52- mesh mist eliminator, 54- desulfurization metering pump, 55- circulating pump, 6- second level Benitration reactor, 61- alkali Nozzle for liquid, 62- restrain dedusting demister, and 621- first is vortexed leaf fan, 622- second eddy current leaf fan, and 623- third is vortexed leaf Fan, 624- flusher, 625- water conservancy diversion ring flat-plate, 7- jet flow branch pipe, 8- tank used for storing ammonia, 9- dioxygen water storage tank, 10- diluted acid storage tank, 11- sulphur ammonia reactor, 12- steam heater, 13- evaporation separation chamber, 14- evaporative recirculation pump, 15- condenser, 16- cyclone are given Material pump, 17- cyclone, 18- centrifuge, 19- vacuum pump, 20- hot water storgae, 21- heat-exchanger pump, 22- standby power system, 23- work Skill water storage tank.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.According to claims and following Explanation, advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and uses Non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
Embodiment
A kind of coke oven flue gas comprehensive treatment system, as shown in Figs. 1-2, including the storage of power-supply system 3, dioxygen water storage tank 9, ammonium hydroxide Tank 8, technique water storage tank 23, waste heat steam boiler 1, blower fan system 2 and system for desulfuration and denitration;The system for desulfuration and denitration is by level-one Benitration reactor 4, desulfurizing tower 5 and second level Benitration reactor 6 form;It is the waste heat steam boiler 1, the blower fan system 2, described Level-one Benitration reactor 4, the desulfurizing tower 5 and the second level Benitration reactor 6 are sequentially connected.
In waste heat steam boiler 1, flue gases of cock oven, which carries out heat transmitting by waste heat steam boiler 1 and water, reduces temperature, The flue gases of cock oven after cooling meets the requirement of subsequent system for desulfuration and denitration inlet flue gas temperature.
Wherein, the blower fan system 2 uses booster fan frequency control to ensure that the wind pressure generated is able to satisfy the coke oven Tiny structure is kept to ensure safety in production in the case where smoke comprehensive governing system.The technique water storage tank 23 stores coking system The waste ammonia liquor of generation, dioxygen water storage tank 99 store the hydrogen peroxide of 27.5wt%.
In a preferred embodiment, the level-one Benitration reactor 4 is connected with the dioxygen water storage tank 9 and internal be equipped with is vortexed Reactor (not shown), the level-one Benitration reactor 4 are connect by runner 41 with 5 bottom of desulfurizing tower, the runner 41 For inverted U runner 41 and 41 cross section of runner is gradually reduced.
In level-one Benitration reactor 4, the flue gases of cock oven of process is divided into tens strands by the vortex reactor The air-flow of high speed rotation flowing is simultaneously sent into the runner 41 and is reacted with hydrogen peroxide, these air-flows rapidly smash solution dispersion, and It is sufficiently mixed, forms strength pneumatic stirring, gas-liquid two-phase forms froth bed, the specific surface area of gas-liquid two-phase is made to be expanded into maximum. Gas-liquid two-phase carries out very thorough and quick mass transfer, hydrogen peroxide and is catalyzed the hydroxy radical OH and flue gas to be formed in froth bed Middle NOx is sufficiently reacted.To make in the flue gases of cock oven most oxynitrides slough and from the runner 41 Into the desulfurizing tower 5, while level-one denitration by-product of the generation containing nitric acid and hydrogen peroxide falls back to the level-one with self weight and takes off 4 bottom of nitre reactor.Since the runner 41 is that U-shaped runner 41 and 41 sectional area of runner are gradually reduced, due to the runner 41 Limitation, being become from original perpendicular flow of the flue gases of cock oven rotates horizontally flowing, simultaneously because the runner 41 41 sectional area of runner is gradually reduced, and the coke oven flue gas velocity increases, to promote the flue gases of cock oven and the dioxygen The reaction of water.
In a preferred embodiment, the top side connection of the desulfurizing tower 5 is separately connected the dioxygen water storage tank 9 and ammonium hydroxide Storage tank 8;So that the flue gases of cock oven moves from below to up, the hydrogen peroxide moves from top to down.Since hydrogen peroxide is in alkalinity It is easier to obtain hydroxyl radical free radical in environment, the sufficiently catalytic hydrogen peroxide of ammonium hydroxide that tank used for storing ammonia 8 provides obtains more hydroxyls certainly By base.Filler buffer layer 51 and mesh mist eliminator 52 are equipped in the desulfurizing tower 5 from the bottom to top;The bottom of the desulfurizing tower 5 and Top is connected by circulating pump 55;So that desulphurization reaction recycles, sufficiently react.
Wherein, the filler buffer layer 51 is shared two layers and is arranged at intervals in the desulfurizing tower 5, the filler buffer layer 51 include filler and support plate, the filler by huddle or whole block in a manner of be placed on the support plate.In the desulfurizing tower 5 It is additionally provided with vortex gas distributor (not shown), the vortex gas distributor is located at 51 lower section of filler buffer layer.
The filler buffer layer 51 is to slow down the movement velocity of the flue gases of cock oven and the hydrogen peroxide and as gas The mass transfer apparatus of contact member between liquid two-phase so that the flue gases of cock oven in the filler surface with the dioxygen that meets The abundant reaction of water, thus major part SO in the flue gases of cock oven2It is divested and enters second level Benitration reactor 6, it is raw simultaneously At sulfur acid and the desulfurizing byproduct of hydrogen peroxide fall back to 5 bottom of desulfurizing tower with self weight.Mesh mist eliminator 52 is used to cut Stay fine droplet in the flue gases of cock oven.
Vortex gas distributor in the desulfurizing tower 5 realizes that the flue gases of cock oven is uniform in the desulfurizing tower 5 Distribution.The filler buffer layer 51 shares two layers and can come into operation when discharge index improves, it is ensured that desulfuration efficiency is able to satisfy most New nation's standard and in the future tightened up discharge standard.
In a preferred embodiment, it is easier to obtain hydroxy radical, sufficiently catalytic dioxygen in alkaline environment due to hydrogen peroxide Water obtains more hydroxy radicals, adds lye nozzle 61 in the second level Benitration reactor 6, lye nozzle 61 and stores coke The technique water storage tank 23 for the waste ammonia liquor that change system generates is connected.
It is equipped with tube bank dedusting demister 62 in the second level Benitration reactor 6 and is located at 5 top of desulfurizing tower.Beam removes Dirt demister by the flue gases of cock oven after out of stock reacted micro dust and acid mist retain and make in the acid mist Hydrogen peroxide participate in denitration reaction again.Wherein, water conservancy diversion ring flat-plate 625 is equipped in the tube bank dedusting demister 62 and rinse dress 624 are set, the first vortex leaf fan 621, second eddy current leaf fan 622 and third vortex leaf fan 623 from top to bottom are additionally provided with, it is described to lead Stream ring flat-plate 625 is located between second eddy current leaf fan 622 and third vortex leaf fan 623;62 side of tube bank dedusting demister Equipped with exhanst gas outlet (not shown), the smoke outlet is equipped with water fender (not shown).
Increase flue gas rotation due to being vortexed the guiding role of leaf fan, under the action of being vortexed the centrifugal force that leaf is fanned, mist Drop and dust mutually collide in motion process generation to vessel wall motion and are condensed into biggish drop, drop is thrown toward cylinder Inner wall surface contact latter with falling into second level Benitration reactor 6, realization dedusting and demisting with the drop layer of wall surface attachment.It is described Vortex leaf fan has three layers, reinforces dedusting and defogging effect.Water conservancy diversion ring flat-plate 625 is used to improve the movement speed of the flue gases of cock oven Degree reinforces dedusting and defogging effect.Exhanst gas outlet is used for the flue gases of cock oven handled by desulphurization denitration and dedusting demisting Discharge.Water fender is used to that droplet is prevented to escape.
In entire system for desulfuration and denitration, 4 bottom of level-one Benitration reactor is connected described by desulfurization metering pump 54 Circulating pump 55;So that the hydrogen peroxide in the level-one denitration by-product and the desulfurizing byproduct passes through the circulating pump 55 The desulphurization reaction for participating in the desulfurizing tower 5, can recycle hydrogen peroxide, save the cost.The second level Benitration reactor 6 connects The top with the desulfurizing tower 5 is connect, carries out the second level denitration by-product of denitration reaction with self weight in the second level Benitration reactor 6 5 tower bottom of desulfurizing tower is fallen back to, and is mixed to form with the level-one denitration by-product and the desulfurizing byproduct including sulfuric acid, Nitric acid, the by-product of dioxygen aqueous mixtures, the by-product are 30wt% sulfuric acid and nitric acid mixed liquor.The desulfurizing tower 5 Tower bottom is used for the diluted acid storage tank 10 of by-product recovery by the connection of jet flow branch pipe 7.Jet flow branch pipe 7 will be after bulk devulcanization denitration reaction By-product recovery into diluted acid storage tank 10.
Wherein denitration mechanism is WT-H2O2Low temperature process denitrating technique, this is that Hubei Wei Tian Environmental Protection Technology Co., Ltd introduces beauty A kind of novel denitration technology of independent research on the basis of Guo Huofeng system international corporation NASAMPCS denitration technology, the technology obtain National utility patent authorization and patent of invention are accepted, the patent No.: ZL:201520966067.0, the technology with The hydrogen peroxide of 27.5wt% is as oxidant, by the way that hydrogen peroxide catalysis is generated the hydroxyl with strong oxidation in alkaline environment Base free radical OH, hydroxyl radical free radical OH are a kind of important active oxygens, are to lose one by hydroxyl OH- from molecular formula It is a to electronically form.Hydroxyl radical free radical obtains electronic capability i.e. oxidability, oxidizing potential 2.8V with extremely strong.It is nature In be only second to the oxidant of fluorine.Hydroxy radical OH is mixed with the flue gas by the pressurization that is vortexed in flue gas in Benitration reactor Nitrogen oxides (predominantly NO and NO2Deng) oxid-reclamatiom is carried out, final mixture recycles denitration by-product nitre through gas-liquid separation Acid and nitrous acid solution, the flue gas qualified discharge after denitration, the denitrating technique have not by flue-gas temperature limited and denitration efficiency compared with The features such as high.
Specific chemical equation are as follows:
H2O2→2·OH
H2O2+·OH→HO2·+H2O
NO+HO2·→NO2+·OH
NO2+·OH→HNO3
NO+·OH→HNO2
NO+H2O2→NO2+H2O
H2O2+2NO2→2HNO3
Desulphurization mechanism is WT-H2O2Doctor treatment, this is to wash removing flue gas in desulfurizing tower 5 using 27.5wt% hydrogen peroxide Middle SO2To achieve the purpose that flue gas desulfurization.Hydrogen peroxide by oxidizing sulfur dioxide, generates sulfuric acid in an acidic solution.Sulfuric acid can With miscible with arbitrary proportion with water, it not will cause supersaturated crystallization, cause fouling blockage problem, it is therefore, de- using peroxide passivation Sulphur technique improves the reliability of system, reduces investment and operating cost.Dilute sulfuric acid can be used as ammonium sulfate workshop section raw material simultaneously It uses, secondary pollution will not be led to the problem of.
Specific chemical equation are as follows:
SO2+H2O→H2SO3
H2O2+H2SO3→H2SO4+H2O
2H2O2→2H2O+O2
In a preferred embodiment, further include by-product processing system, the by-product processing system include respectively with it is described The sulphur ammonia reactor 11 that diluted acid storage tank 10 and the tank used for storing ammonia 8 connect, connect with the steam (vapor) outlet of the waste heat steam boiler 1 Vapo(u)rization system and for being separated by solid-liquid separation, the separator of dehydration, the vapo(u)rization system by steam for being heated.
Wherein, the vapo(u)rization system includes steam heater 12, the evaporation separation chamber connecting with the sulphur ammonia reactor 11 13, condenser 15 and evaporative recirculation pump 14;The condenser 15 is connect with the evaporation separation chamber 13.The evaporative recirculation pump 14 It is separately connected the evaporation separation chamber 13 and the steam heater 12.
Wherein, the separator includes sequentially connected cyclone feed pump 16, the cyclone 17 being separated by solid-liquid separation With the centrifuge 18 being dehydrated, the cyclone feed pump 16 is connect with the evaporation separation chamber by the nitre sulphur ammonium complex salt Solution is successively sent to cyclone 17 and centrifuge 18.
In by-product processing system, the diluted acid storage tank 10 is connect with the sulphur ammonia reactor 11, so that the by-product Object enters the sulphur ammonia reactor 11 and carries out neutralization reaction generation nitre sulphur ammonium composite compaction technique with ammonium hydroxide, and the nitre sulphur ammonium is answered Close salting liquid send to the vapo(u)rization system, wherein steam is provided by afterheat utilizing system, and steam enters heater as heat source, Heating is carried out to the nitre sulphur ammonium composite compaction technique and is concentrated to get the nitre sulphur ammonium composite compaction technique that solid content is 10wt~15wt%, And generate condensed water.Condensed water enters hot water storgae 20 and is recovered in system for desulfuration and denitration as supplement water.Entire evaporation system System is tiny structure, and evaporation efficiency is high.Evaporative recirculation pump 14 so that the nitre sulphur ammonium composite compaction technique in the evaporation separation chamber and It is repeatedly recycled between the steam heater 12, so that heating concentrated effect is more preferable.The cyclone feed pump 16 will heat dense The nitre sulphur ammonium composite compaction technique after contracting, which is sent to the cyclone 17, to be separated by solid-liquid separation, solid content increase to 40wt%~ 50wt% or so is dehydrated to obtain aqueous compound in the grains nitre sulphur ammonium of 5wt% or so subsequently into the centrifuge 18 Salt.Sulfuric acid, nitric acid are reacted with ammonia respectively generates nitre sulphur ammonium complex salt.
Full water-soluble high-nitrogen compound fertilizer of the ammonium sulphate nitrate as sulfur-bearing and nitrate nitrogen, is one of primary raw material of Water soluble fertilizer, Also it can directly apply, there is biggish market development space, while produce the problem of outlet that nitre sulphur ammonium also solves nitric acid and ammonia, be One very promising product.In this state, ammonium nitrate loses explosivity, and ammonium sulphate nitrate is safe.
Specific chemical equation in by-product processing system are as follows:
H2SO4+HNO3+3NH3=(NH4)2SO4·NH4NO3
Respectively with recirculated water, vacuum pump 19 is connected the condenser 15 with hot water storgae 20, the hot water storgae 20 and heat-exchanger pump 21 are connected and remove extraneous hot water by the heat-exchanger pump 21.
It in a preferred embodiment, further include the standby power system 22 and standby fan for having full-automatic startup function, institute Standby power system 22 is stated to connect with the entire coke oven flue gas comprehensive treatment system.The standby power system 22 and entire institute The connection of coke oven flue gas comprehensive treatment system is stated, realization starts automatically when the power-supply system 3 can not power, when the power supply system After system 3 restores, shut down from line delay.The standby fan prevents from breaking down because the blower fan system 2 is run.
In a preferred embodiment, the standby fan includes backup power source.Guarantee that spare motor when in use can be normal Operating.
It in a preferred embodiment, further include the DCS control that the coke oven flue gas comprehensive treatment system is monitored and operated System processed.Operations staff can be monitored and be operated by DCS operator station, realize that comprehensive treatment system opens/stops a key and opens Dynamic, normal operation monitoring and the processing for being operating abnormally operating condition.In production control, the reaction of continuous addition accurate measurement is taken Required hydrogen peroxide, ammonium hydroxide and water guarantee the stable content for the by-product diluted acid being discharged in 30wt% simultaneously;It can also be online Monitor SO in the flue gases of cock oven2And the concentration value of oxynitrides, and the additional amount for controlling hydrogen peroxide is adjusted with the value, Main foundation as running Optimization.
In a preferred embodiment, dioxygen water storage tank 9 is made by FRP material, sets one altogether, design size are as follows: and Φ 3800 × 4000mm volume is 45m3, meet system 10-15 days or so hydrogen peroxide consumption volumes.Temperature sounder is arranged in tank body, pressure becomes Device is sent to be monitored and be transferred to DCS control system to the temperature of storage tank and pressure change in real time, is more than in temperature and pressure Starting safety system is simultaneously emitted by acousto-optic electric alarm and starts placing device when setting safety value.Hydrogen peroxide storage met Related request in hydrogen oxide national standard and common hazardous chemical storage general rule.
Since hydrogen peroxide has unstability, initial exotherm decomposition temperature is 34.5 DEG C under adiabatic conditions, is being put It can lead to pressure of storage tank increase in the case where thermal decomposition acutely, temperature rises, may explode when serious, therefore hydrogen peroxide stores up Tank 9 is arranged in the heat-insulated dedicated storage being protected from light, and avoids hydrogen peroxide because unstable reaction occurs for solar radiation, and between storage Interior setting ventilating system is prevented to ensure hydrogen peroxide storage environment temperature at 34 DEG C or less answering hydrogen peroxide itself decomposition caused heat release and be produced Raw danger.Pressure release pneumostome is set in dioxygen water storage tank 9 simultaneously to ensure to be able to because hydrogen peroxide itself decomposes the pressure generated A pressure release is arranged from return mouth and an activated carbon adsorption mouth in pressure release pneumostome leading portion in release, and activated carbon adsorption mouth is used for Prevent the dust of air from containing heavy metal component, pressure release return mouth is automatically closed in system worked well, and hydrogen peroxide is consuming The liquid level vacuum generated in the process supplements air by activated carbon adsorption mouth, and the filtering of active carbon can be to avoid micro in environment Heavy metal enters the danger that dioxygen water storage tank 9 and hydrogen peroxide generate pyrolytic reaction and generate.
Since hydrogen peroxide is to have an endothermic process at 75 DEG C -85 DEG C during exothermic decomposition, in the temperature range pair Dioxygen water storage tank 9 forces cooling to be just avoided that the explosion generated because hydrogen peroxide sharply decomposes.Therefore it is set at the top of dioxygen water storage tank 9 Annular cooler is set, pressure cooling is carried out to storage when DCS monitors starting cooling system when dioxygen water storage tank 9 reaches 75 DEG C. In 9 bottom of dioxygen water storage tank setting cofferdam by pipeline and desulfurization island cofferdam connection, to prevent hydrogen peroxide from leaking and force cooling When to scene pollution.
In hydrogen peroxide memory block, cofferdam is arranged with other fire fighting devices and in memory block in setting fire hydrant.Simultaneously between storage Interior setting hazardous chemical known card safely.
When work, under the action of blower fan system 2, the flue gases of cock oven carries out heat by waste heat steam boiler 1 and water Transmitting reduces temperature, and the flue gases of cock oven after cooling meets the requirement of subsequent system for desulfuration and denitration inlet flue gas temperature, produces simultaneously Raw steam send to evaporation heater 12 and provides heat source, and the flue gases of cock oven is successively arrived by the booster fan of blower fan system 2 Up to level-one Benitration reactor 4, desulfurizing tower 5, second level Benitration reactor 6 reaches desulfurization, denitration, dedusting, is discharged, produces after demisting purpose Raw contains sulfuric acid, and nitric acid, the by-product of dioxygen water mixed liquid, which is sent by jet flow branch pipe 7 to sulphur ammonia reactor 11 and ammonium hydroxide, to carry out Neutralization reaction generates nitre sulphur ammonium complex salt, and nitre sulphur ammonium complex salt is successively sent to evaporation heater 12 and heated by steam to it, sent Separate nitre sulphur ammonium complex salt with steam to evaporation separation chamber 13, the cyclone feed pump 16 connecting with evaporation separation chamber 13 The nitre sulphur ammonium composite compaction technique after heating concentration is sent to the cyclone 17 and is separated by solid-liquid separation, subsequently into it is described from Scheming 18 is dehydrated to obtain the aqueous grains nitre sulphur ammonium complex salt in 5wt% or so.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it Interior, then the invention is also intended to include including these modification and variations.

Claims (8)

1. a kind of coke oven flue gas comprehensive treatment system, it is characterised in that: including power-supply system, dioxygen water storage tank, tank used for storing ammonia, work Skill water storage tank, waste heat steam boiler, blower fan system and system for desulfuration and denitration;The system for desulfuration and denitration is by level-one denitration reaction Device, desulfurizing tower and second level Benitration reactor composition;The waste heat steam boiler, the blower fan system, the level-one denitration reaction Device, the desulfurizing tower and the second level Benitration reactor are sequentially connected;
The level-one Benitration reactor is connected with the dioxygen water storage tank and inside is equipped with vortex reactor, and the level-one denitration is anti- Device is answered to connect by runner with the desulfurization tower bottom, the runner is inverted U runner and flow channel cross-section is gradually reduced;
The top side of the desulfurizing tower is separately connected the dioxygen water storage tank and the tank used for storing ammonia, and the desulfurizing tower is interior under Supreme to be equipped with filler buffer layer and mesh mist eliminator, the bottom and top of the desulfurizing tower are connected by circulating pump;
The second level Benitration reactor is located above the desulfurizing tower, and tube bank dedusting demisting is equipped in the second level Benitration reactor Device and lye nozzle, the lye nozzle are connect with the technique water storage tank, and the technique water storage tank stores coking system The waste ammonia liquor of generation;
Level-one Benitration reactor bottom connects the circulating pump by desulfurization metering pump;The desulfurizing tower tower bottom passes through jet flow Branch pipe connection is used for the diluted acid storage tank of by-product recovery;
It further include by-product processing system, the by-product processing system includes sequentially connected sulphur ammonia reactor, vapo(u)rization system With the separator for being separated by solid-liquid separation, being dehydrated;The sulphur ammonia reactor respectively with the diluted acid storage tank and the tank used for storing ammonia Connection, vapo(u)rization system connect with the steam (vapor) outlet of the waste heat steam boiler and pass through steam for heating.
2. coke oven flue gas comprehensive treatment system according to claim 1, it is characterised in that: the filler buffer layer shares two layers And be arranged at intervals in the desulfurizing tower, the filler buffer layer includes filler and support plate, and the filler is to huddle or whole block Mode be placed on the support plate.
3. coke oven flue gas comprehensive treatment system according to claim 1 or claim 2, it is characterised in that: be additionally provided in the desulfurizing tower Vortex gas distributor, the vortex gas distributor are located at below the filler buffer layer.
4. coke oven flue gas comprehensive treatment system according to claim 3, it is characterised in that: in the tube bank dedusting demister Equipped with water conservancy diversion ring flat-plate and flusher, it is additionally provided with the first vortex leaf fan, second eddy current leaf fan and third vortex leaf from top to bottom Fan, the water conservancy diversion ring flat-plate are located between second eddy current leaf fan and third vortex leaf fan;Tube bank dedusting demister side is set There is exhanst gas outlet, the smoke outlet is equipped with water fender.
5. according to claim 1 or the 4 coke oven flue gas comprehensive treatment systems, it is characterised in that: the vapo(u)rization system includes steaming Vapour heater evaporates separation chamber, condenser and evaporative recirculation pump;The evaporation separation chamber be separately connected the sulphur ammonia reactor and The condenser, the evaporative recirculation pump are separately connected the evaporation separation chamber and the steam heater.
6. coke oven flue gas comprehensive treatment system according to claim 5, it is characterised in that: the separator includes successively connecting The cyclone feed pump connect, cyclone and centrifuge, the cyclone feed pump are connect with the evaporation separation chamber.
7. coke oven flue gas comprehensive treatment system according to claim 1, it is characterised in that: further include having full-automatic starting function The standby power system and standby fan of energy, the standby power system and the entire coke oven flue gas comprehensive treatment system connect It connects, the standby fan is equipped with backup power source.
8. coke oven flue gas comprehensive treatment system according to claim 1, it is characterised in that: further include comprehensive to the coke oven flue gas Close the DCS control system that governing system is monitored and operated.
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