CN101176837A - Novel technique for controlling and governing bone coal navajoite torrefaction waste gas - Google Patents
Novel technique for controlling and governing bone coal navajoite torrefaction waste gas Download PDFInfo
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- CN101176837A CN101176837A CNA2006101249981A CN200610124998A CN101176837A CN 101176837 A CN101176837 A CN 101176837A CN A2006101249981 A CNA2006101249981 A CN A2006101249981A CN 200610124998 A CN200610124998 A CN 200610124998A CN 101176837 A CN101176837 A CN 101176837A
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Abstract
The invention relates to a new control and governing craft for the waste gas of the bone coal vanadium ore, aiming at the waste gas produced by certain new environmental protection compound addition agent and the bone coal vanadium ore grinded to 100 mesh (0.15mm) and well mixed according to certain proportion, then roasted through the rotary kiln; the waste gas passes the dry type cyclone dedust, then according to three classes, six levels turbulent motion foam absorption tower uses different absorption liquid to carry on the absorption process, causes the emission waste gas so as to achieve the requirement of the GB16297-1996 standard.
Description
Technical field
The present invention relates to the control and improvement technology and equipment guarantee of bone coal navajoite torrefaction waste gas.
Background technology
China has found vanadium at the end of the fifties in last century in bone coal shale, by numerous geologists' effort, found out more than 600 hundred million tons of bone coal navajoite resource ore amounts that spread all over a provinces and cities surplus China 20, surpasses the gross reserves of countries in the world vanadium.Because the bone coal navajoite aboundresources of China is so have broad prospects to the development and use of bone coal navajoite.Through China has been gone into operation 20 surplus the investigation of bone coal navajoite vanadium extraction producer of family, mostly adopt flat kiln roasting technique, and there is serious deficiency in treatment of waste gas, the waste gas that roasting produces in the production is seriously polluted to environment.Therefore, the control of research and development bone coal navajoite torrefaction waste gas, improvement new technology and equipment, extremely important.
Summary of the invention
By the pollution sources of bone coal navajoite vanadium-extracting roasting waste gas are controlled, again the waste gas centralized collection is handled, and to long-term repetition test researchs such as equipment improve, establish elder generation after dry type cyclone dust removal, used the new technology of three classes, the dedusting of six grades of turbulence foaming towers, washing, purifying exhaust air again.
1, uses bone coal navajoite vanadium extraction novel environment-protection compound additive, it has low and have conversion, catalysis, oxidation, a solidification with the baking mixed loss on ignition of ore, when realizing the vanadium high conversion, can also realize conversion and curing, reduce the SO that the bone coal navajoite vanadium-extracting roasting is produced from pollution sources pernicious gas
x, Cl
2, HCl etc. discharge capacity, and make it generate sulfate and chloride, reach the purpose that pernicious gas is solidified.
2, pernicious gas is carried out centralized collection, and process turbulence foaming tower divides three classes, 6 grades of processing, pernicious gases such as dust in flue gas, chlorine, hydrogen chloride, sulfur trioxide and arsenic trioxide, its absorptivity all reaches more than 90%, and final exhaust gas discharged can reach the GB16297-1996 standard.
(1), the 1st, 2 grades of turbulence foaming towers of the first kind, use water as dedusting, absorbent, make dust in flue gas and part SO
x, Cl
2, HCl gas, in the 1st, 2 grade of turbulence foaming tower, be effectively controlled, particularly play the wet dust removal function, obtain acid ore pulp and recycle as the leaching agent of roasting grog.
(2), the 3rd, 4,5 grades of turbulence foaming tower 10%NH of second class
4HCO
3The aqueous solution is made absorbent, can be with most of SO
x, Cl
2, GAS ABSORPTION such as HCl, obtain NH
4Cl, NH
4ClO and (NH
4)
2SO
4Deng heteroacid ammonium fertilizer, nitrogen content can reach more than 20%, can be used for making the raw material of compound fertilizer, guarantees that chlorine and hydrogen chloride gas absorb fully.
(3), the 6th grade of turbulence foaming tower of the 3rd class make absorbent with saturated limewater solution, chlorine, hydrogen chloride, sulfur trioxide and the arsenic trioxide of trace generate calcium chloride, calcium hypochlorite, calcium sulfate and calcium arsenate respectively, obtain more complete absorption.
3, the structure on turbulence foam absorption tower is seen accompanying drawing 1: the structure chart of turbulence foaming tower.
4, turbulence foam absorption tower operation principle.
Waste gas at first carries out dry type cyclone dust removal through the swabbing action of centrifugal high pressure fan with waste gas, and after the water curtain dedusting before making gas through the absorption tower again, the cooling, waste gas continues to overflow to move upward and enters the turbulence foaming tower.Gas is through two-layer pore dividing plate and several turbulence balls, on every layer of turbulence ball top the absorption liquid spray pipe is housed, the turbulence ball is on the pore dividing plate, and the turbulence by the promotion of gas reaches that absorption liquid fully contacts with waste gas and purpose that the pernicious gas composition is fully absorbed.Waste gas continues to rise through double-deck louvered board then, because the effect that the high pressure liquid spray painting drenches, double-deck louvered board surface produces a large amount of foams, increase the contact area and the assimilation effect of absorbent and waste gas, after each tower work was intact, waste gas was delivered to the upper level absorption tower from top of tower, continue same principle work, be the absorbent difference that the absorption liquid of every grade of input adopts, last, absorption liquid focuses in the tower in the pond automatic overflow outside tower in the dosing pond.
5, see accompanying drawing 2: turbulence foam absorption tower technology arrangement figure.
The specific embodiment
Below in conjunction with accompanying drawing 1,2 pairs of specific embodiment of accompanying drawing this technology is further specified:
One, the control of the generation of waste gas and pollution sources
1, stone coal vanadium-extracting roasting additive: what the present invention adopted is certain novel environment-protection compound additive, and this additive has following four kinds of functions and effect:
(1) vanadium that exists with the low price form in the bone coal navajoite had catalysis, oxidation;
(2) can accelerate vanadium from being converted into the speed of high price at a low price, reduce the roasting conversion temperature;
(3) be convenient to form soluble in water and sodium metavanadate low-concentration sulfuric acid;
(4) waste gas that roasting is produced has conversion, solidification, records the total loss on ignition of technology less than 4% through test, can effectively reduce discharge amount of exhaust gas, from source control exhaust emission.
2, the mechanism of action of additive.
(1), mixes the sodium salt transforming agent and be easy to decompose generation Na at low temperatures
2O, and easy and V
2O
5Generate sodium metavanadate soluble in water, promote the conversion of vanadium;
2V
2O
3+4NaCl+3O
2＝＝＝4NaVO
3+2Cl
2↑ ……(1)
V
2O
3+Na
2CO
3+O
2＝＝＝2NaVO
3+CO
2↑ ……(2)
V
2O
3+Na
2SO
4+O
2＝＝＝2NaVO
3+SO
3↑ ……(3)
(2), contain promotion and accelerate the catalysis that the low price vanadium is oxidized to the high price vanadium, oxidant V
2O
5And MnO
2, can realize the quick oxidizing process of vanadium.Simultaneously, realize conversion, so that solidify to pernicious gas.
(3), adding has a certain amount of material that sulfur trioxide, chlorine and hydrogen chloride gas is had solidification in the additive, can be with the chlorine, hydrogen chloride and the sulfur trioxide gas that produce in the roasting process partly solidified or transform, generate chloride and sulfate and be retained in the solids, realize discharge of harmful gases such as sulfur trioxide, chlorine and hydrogen chloride from waste gas generation source.
Cl
2+H
2O＝＝＝HCl+HClO ……(6)
MeO+HCl＝＝＝MeCl
2+H
2O ……(8)
MeO+2HClO＝＝＝Me(ClO)
2+H
2O ……(9)
2MeO+2Cl
2＝＝＝MeCl
2+Me(ClO)
2 ……(10)
MeO+SO
3＝＝＝MeSO
4 ……(11)
(4), the characteristic of novel environment-protection compound additive: such additive loss on ignition so decomposition own becomes the amount of pernicious gas also with regard to seldom, has obtained effective control in the source of waste gas generation less than 4%.But SO is arranged
x, Cl
2Produce with the HCl pernicious gas.
3, the roasting of bone coal navajoite:
Because of containing sulphur in the bone coal navajoite, the arsenic of trace etc., under the situation of high temperature, a large amount of oxygen and additive effect, most sulphur are with SO in the gas
3Form exist, arsenic is with As
2O
3And As
2O
5Form exist.
Two, the improvement of harmful exhaust.
The extracting vanadium from stone coal harmful exhaust results from the high-temperature roasting operation.Key component in the waste gas has: dust, CO
2, a spot of Cl
2, HCl, SO
3Gas, micro-As
2O
3And water vapour.
1, the improvement of dust: contain the vanadium material in roasting process, because of stirring of rotary kiln, the suction of centrifugal high pressure fan, the ash that the burner heavy oil combustion produces, mistake mineral fine etc. can enter exhaust gas and dust.We carry out following processing:
(1), earlier with waste gas through dry type cyclone dust removal, coarse grained dust is promptly separated, the dust that this part is collected continues to turn back in the compounding process to be recycled.
(2), the waste gas after dry type cyclone dust removal, continue to enter in first wet type turbulence foaming tower along flue, carry out wet dust removal, the dedusting mud of 1,2 grades of towers of the first kind enters into first drill traverse and goes out in the middle of the operation.Dust in the waste gas meets procedure technology requirement down fully behind the two-stage dust removal of doing, wet.
2, the improvement of pernicious gas: because this process using totally enclosed type interlocking automatic control rotary kiln, kiln tail facility is provided with the torrefaction waste gas gathering system especially, and the waste gas through collecting is behind the final dusting of doing, wet, and the dust basic handling is clean.Waste gas is by the 1st, 2 grades of absorption towers of the first kind, because this tower is made absorbent with water, the SO in the waste gas
3, Cl
2, HCl etc. tentatively absorbed, and forms acid solution, directly enter and leach circulation.Second class the 3rd, 4,5 absorption tower 10%NH
4HCO
3The aqueous solution is made absorbent, reacts as follows:
SO
3：2NH
4HCO
3+SO
3＝＝＝(NH4)
2SO
4+H
2O+2CO
2↑…(12)
Cl
2：2NH
4HCO
3+Cl
2＝＝＝NH
4Cl+NH
4ClO+2CO
2↑……(13)
HCl：NH
4HCO
3+HCl＝＝＝NH
4Cl+CO
2↑+H
2O ……(14)
Absorbent is made with limewash in the 6th grade of absorption tower of the 3rd class, does not have absorbed pernicious gas to continue and the reaction of caustic lime water at preceding 5 grades.
SO
3：Ca(OH)
2+SO
3＝＝CaSO
4+H
2O ……(15)
Cl
2：2Ca(OH)
2+2Cl
2＝＝Ca(ClO)
2+CaCl
2+2H
2O ……(16)
HCl：Ca(OH)
2+2HCl＝＝CaCl
2+2H
2O ……(17)
As
2O
3：3Ca(OH)
2+As
2O
3+O
2＝＝Ca
3(AsO
4)
2+3H
2O?……(18)
As
2O
5：As
2O
5+3Ca(OH)
2＝＝＝Ca
3(AsO
4)
2+3H
2O ……(19)
Handle SO in the waste gas through three classes, six grades of absorptions
x, Cl
2, HCl, As
2O
3And As
2O
5Deng uptake reach more than 90%.To the direct field monitoring of emptying flue gas, dust in flue gas, chlorine, hydrogen chloride gas, sulfur dioxide, sulfur trioxide, nitrogen oxide etc. all are lower than the GB16297-1996 standard through environmental protection mechanism.
Claims (2)
1. the control of bone coal navajoite torrefaction waste gas and improvement new technology
1, the control of bone coal navajoite torrefaction waste gas and improvement new technology after the cyclone dust removal of waste gas employing dry type, are handled with three classes, 6 grades of turbulence foam absorption towers again, it is characterized in that: according to mainly containing dust and SO in the baking flue gas
x, Cl
2, pernicious gas such as HCl characteristics, adopt earlier through dry type whirlwind and water curtain dedusting, water, 10% sodium bicarbonate solution, saturated limewater are made absorbent again, and absorb through multistage turbulence foam absorption tower, and finally the row of making reaches the GB16297-1996 standard-required to aerial gas.
According to the control of the described bone coal navajoite torrefaction waste gas of claim 1 with administer new technology, turbulence foam absorption tower is characterized in that: absorption liquid is formed (seeing accompanying drawing one) through 16 parts such as high pressure liquid spray painting pipe, turbulence ball and double-deck louvered boards in tower, produce a large amount of foams during work, increase waste gas and absorbent touch opportunity and contact area, can improve absorption efficiency, be different from the tubulent contact tower in the traditional handicraft.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101249981A CN101176837A (en) | 2006-11-10 | 2006-11-10 | Novel technique for controlling and governing bone coal navajoite torrefaction waste gas |
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|---|---|---|---|
| CNA2006101249981A CN101176837A (en) | 2006-11-10 | 2006-11-10 | Novel technique for controlling and governing bone coal navajoite torrefaction waste gas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062527A (en) * | 2010-11-18 | 2011-05-18 | 北京科技大学 | Decarburization roasting device of vanadium extraction by fire for stone coal containing vanadium and processing thereof |
| CN103331072A (en) * | 2013-07-18 | 2013-10-02 | 平安电气股份有限公司 | Series row type sphere grid plate wet-type filter |
| CN104141155A (en) * | 2014-07-10 | 2014-11-12 | 湖州织里荣华铝业有限公司 | Electrolytic aluminum exhaust gas treatment device |
| CN104984648A (en) * | 2015-06-04 | 2015-10-21 | 中国科学院过程工程研究所 | Combined dry and wet method for treating tail gas produced in sodium salt roasting of navajoite |
| CN108465334A (en) * | 2018-06-02 | 2018-08-31 | 陈爱霞 | Waste gas purification apparatus |
| CN111185079A (en) * | 2019-12-04 | 2020-05-22 | 大连百傲化学股份有限公司 | Resourceful treatment method for acid gas in incineration flue gas |
-
2006
- 2006-11-10 CN CNA2006101249981A patent/CN101176837A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062527A (en) * | 2010-11-18 | 2011-05-18 | 北京科技大学 | Decarburization roasting device of vanadium extraction by fire for stone coal containing vanadium and processing thereof |
| CN102062527B (en) * | 2010-11-18 | 2012-09-05 | 北京科技大学 | Decarburization roasting device of vanadium extraction by vanadium containing stone coal and fire, and processing thereof |
| CN103331072A (en) * | 2013-07-18 | 2013-10-02 | 平安电气股份有限公司 | Series row type sphere grid plate wet-type filter |
| CN103331072B (en) * | 2013-07-18 | 2015-07-01 | 平安电气股份有限公司 | Series row type sphere grid plate wet-type filter |
| CN104141155A (en) * | 2014-07-10 | 2014-11-12 | 湖州织里荣华铝业有限公司 | Electrolytic aluminum exhaust gas treatment device |
| CN104984648A (en) * | 2015-06-04 | 2015-10-21 | 中国科学院过程工程研究所 | Combined dry and wet method for treating tail gas produced in sodium salt roasting of navajoite |
| CN104984648B (en) * | 2015-06-04 | 2017-06-13 | 中国科学院过程工程研究所 | A kind of method of wet-dry change Combined Treatment navajoite sodium roasting tail gas |
| CN108465334A (en) * | 2018-06-02 | 2018-08-31 | 陈爱霞 | Waste gas purification apparatus |
| CN108465334B (en) * | 2018-06-02 | 2021-01-05 | 广东科霖环保设备有限公司 | Exhaust gas purification device |
| CN111185079A (en) * | 2019-12-04 | 2020-05-22 | 大连百傲化学股份有限公司 | Resourceful treatment method for acid gas in incineration flue gas |
| CN111185079B (en) * | 2019-12-04 | 2022-02-08 | 大连百傲化学股份有限公司 | Resourceful treatment method for acid gas in incineration flue gas |
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Open date: 20080514 |