CN102160954B - Enclosed ore-smelting furnace tail gas purification method for production of chemical products - Google Patents
Enclosed ore-smelting furnace tail gas purification method for production of chemical products Download PDFInfo
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Abstract
The invention discloses a method for purifying enclosed ore-smelting furnace tail gas, which comprises the following steps of: introducing gases produced in an ore-smelting furnace into an air-cooled pipeline which is provided with radiating fins through an air entraining pipeline on the top of the furnace, conveying the gases to a gas-solid separator in an enclosed mode, and reducing the temperature; making the gases pass through the gas-solid separator, an enclosed washing purification device, an enclosed surge washing purification device, an enclosed dehydration device and a pressure swing adsorption decarburization device; and finally obtaining gases suitable for production of the chemical products. The method can effectively purify tail gases to make the tail gases become low-dust high-purity chemical raw material gases, changes waste into treasure, and has better economic and social benefits.
Description
Technical field
The present invention relates to a kind of chemical industry tail gas process for purifying, in particular, relate to a kind of method that purifies closed submerged furnace exhaust gas, the Purge gas that obtains according to this method can reach the production requirement for preparing chemical products.
Background technology
When utilizing the hot stove in ore deposit to carry out Chemical Manufacture; Can produce a large amount of gas (being tail gas); Promptly, utilize the reproducibility of carbonaceous material that the element reduction in the ore is come out, produce a large amount of gas (being tail gas) simultaneously when ore and carbonaceous material during through the heated by electrodes fusion.
Generally speaking, it is the tail gas of main component that the hot stove in common ore deposit (like silicomanganese stove, furnace of calcium carbide, ferrosilicon stove, yellow phosphorus stove etc.) can produce when producing with the carbon monoxide, and all the other are carbon dioxide, hydrogen, tar, dust etc.The hot stove in ore deposit produces the CO gas of high-load, and 2000-3000 ℃ of high-temperature region gas is up through raw material layer to the greatest extent to produce the interface, part heat and solid material heat exchange, thus reduced gas temperature.Arrive furnace roof closed gas chamber (space between raw material and the furnace roof), temperature has been reduced to 300-600 ℃, can make when the boiler roof sealing effect is better to send gas temperature outside and remain unchanged basically.Understanding and what utilize that the hot stove in ore deposit produces is that main tail gas is a long-term environmental improvement problem with the carbon monoxide; The scheme that adopts at the beginning is internal combustion in the stove, airtight back point day lamp; This is undoubtedly a kind of waste of resource, then develops the stove that comes out and burns outward, utilizes heat to dry, fire steam and lime; This also only is a combustibility of utilizing gas, does not make full use of the chemical property of tail gas component.In the last few years, develop gradually and to utilize tail gas to carry out the production of chemical products, this has made full use of the physicochemical properties of each component of tail gas on the one hand, has also widened the source path of China's industrial chemicals on the other hand.Implement today of energy-saving and emission-reduction and clean environment production in China; How further to be familiar with and to make full use of ore deposit this resource of hot furnace exhaust gas; Particularly how the hot furnace exhaust gas in ore deposit is carried out the steadily purification of safety; Making it to satisfy the production requirement quality of chemical products, reach the industrialization and the environment-friendly type cleaner production of high value added product, is an arduous problem that needs to be resolved hurrily.
(application number is 200610169145.X to Chinese invention patent " Drytype process for purifying tail gas from calcium carbide production furnace "; The applying date is on December 18th, 2006; Open day on October 3rd, 2007) a kind of method of purifying calcium carbide furnace tail gas is disclosed; Adopt whirlwind cooling and dedusting and cloth envelop collector, the dust of reception is transported to the dust warehouse with airtight chain mat machine, this wherein each connected system of cyclone separator, cloth envelop collector and chain mat machine all be gas leakage and to the position of system's air inlet (air); Cause easily to external leakage carbon monoxide and air (oxygen) entering system; The former causes the pollution to environment easily, the latter then can work as oxygen when reaching certain concentration owing in stove, draw and contain a large amount of carbon elements the fuel gas and dust and carry the part kindling material secretly, then the possibility that produces burning or blast often takes place moment.For fear of the problems referred to above; Available technology adopting charges into the mode of nitrogen and protects, but this measure one can be diluted the content of available gas carbon monoxide, and two can cause trace oxygen to get into system; Even if do not produce burning or blast; Also can only be used for the normal pressure conveying and remove to burn steam, burnt lime etc., but can not be used for the production chemical product, just can avoid the burning or the blast that cause because of subsequent compression.For the cloth bag class filter that uses; Wherein filter cloth requirement temperature can not be above 250 ℃; The intake air temperature that system is run well must reach cloth envelop collector is about 220 ℃, and the coal tar when being lower than 220 ℃ in the gas can coagulate burnt, sticking powder etc. and carry air resistances to strengthen until gas can't filtration system to paralyse on cloth bag.
Summary of the invention
The object of the present invention is to provide a kind of purification method of the hot furnace exhaust gas in ore deposit of realization of industrialization; Can overcome the deficiency that exists in the prior art, it is few that effective cleaning of off-gas makes it become Dust Capacity, the industrial chemicals gas that purity is high; Turn waste into wealth, better economic and social benefit are arranged.
The object of the invention is achieved through following technical proposals:
A kind of method that purifies closed submerged furnace exhaust gas, carry out according to following step:
At first; The gas that the hot stove production in ore deposit is produced gets into the air cooling pipeline that is provided with radiating fin by the bleed pipeline of furnace roof, and closed conveying also cools to gas-solid separator simultaneously; Air cooling pipeline import department gas temperature is 300-1000 ℃; Pressure is-100-100KPa, and air cooling pipeline exit gas temperature is 150-500 ℃, and pressure is-150 to+150KPa
Secondly; Gas gets into first gas-solid separator and second gas-solid separator by the air cooling pipeline; The spiral discharging device that said first gas-solid separator and second gas-solid separator close dust feed bin and airtight band material envelope by airtight cyclone separator, band densification is formed, and is provided with air blast between two gas-solid separators, and the exit gas temperature of second gas-solid separator is 100-400 ℃; Pressure is 10-50KPa, and tar content is reduced to 1-4g/Nm
3, dust content is reduced to 10-50g/Nm
3
The 3rd; Gas gets into the first airtight water washing cleaning device by the outlet of second gas-solid separator; Make gas get into the second airtight water washing cleaning device through compressor, get into airtight panting water washing cleaning device and airtight dewater unit again, the dust content of the exit gas of airtight dewater unit is at 0.01g/Nm
3Below, tar content is reduced to 0.01g/Nm
3Below, temperature is 10-50 ℃, pressure is 5-20KPa
The 4th, after gas gets into desulfurization and dephosphorization device, getting into the pressure swing adsorption decarbonization device, make gas removal sulphur and phosphorus also further dewater and decarburization, the exit gas temperature is 20-25 ℃, and pressure is 2.5-40MPa, and tar and dust content are all reduced to 0mg/Nm
3Below, obtain being fit to the gas that chemical products are produced.
The said first airtight water washing cleaning device is made up of 1-3 airtight washing unit.
The said second airtight water washing cleaning device is made up of 1-3 airtight washing unit.
Said airtight panting water washing cleaning device is made up of 1-3 airtight washing unit.
Said airtight dewater unit is made up of 1-3 airtight dewatering unit.
In " cleaning of off-gas " the main chemical-process that purifies the hot furnace exhaust gas in ore deposit; The employing cyclic design of using in the first airtight water washing cleaning device, the second airtight water washing cleaning device, airtight panting water washing cleaning device and the airtight dewater unit of purifying waste water; Promptly utilize purifying waste water in the settling tank in the first airtight water washing cleaning device, the second airtight water washing cleaning device and airtight panting water washing cleaning device, tail gas to be washed; Absorb dust, tar, heat and trace acidic gas; After the absorption purify waste water with airtight dewater unit in deviate from purify waste water to be back in the settling tank and produce deposition, form dirt mud, supernatant recycles simultaneously.
(for example furnace of calcium carbide, silicomanganese stove etc.) also can contain the poisonous and harmful compositions such as oxide, cyanogen, arsenic of a large amount of alkalinous metals when the hot furnaceman in ore deposit did except that producing a large amount of tail gas, will be wherein most of soluble in water in the water washing cleaning process, and then from gas, removed.Because the oxide of alkalinous metal is soluble in water; Show alkalescence, and alkaline solution self has flocculation (like calcium oxide), in addition as time passes; Cyanogen, arsenic can react with the alkalinous metal in the alkaline water; Generate cyanogen salt, arsenic salt, in settling tank, produce deposition then, and the interpolation of having saved any form flocculant.In addition, washing tar also can contact with alkaline aqueous solution and form deposition such as calcium salt, and most of heavy ends tar then can precipitate in sedimentation basin with dust.The tar of these depositions, salt, dust have all constituted dirt mud.
Outside " cleaning of off-gas " the main chemical-process that purifies the hot furnace exhaust gas in ore deposit, dust collecting system can also be set, gas-solid separator concentrates on the solid dust of putting with pressure automatically in the airtight dust arrester of dust after gas and solids are left, the formation dry dust.
The dry dust that forms in the dirt mud that produces in the above-mentioned settling tank and the airtight dust arrester of dust mixes use, and coal-burning boiler is carried out desulfurization.
After obtaining to be fit to the gas of chemical products production; The processed gas method that chemical industry capable of using is common; Gas is carried out further pressure swing adsorption decarbonization and hydrogen, smart desulfurization, smart dephosphorization, smart dearsenification, smart dechlorination etc.; To prepare final carbon one and the synthetic hot furnace exhaust gas in ore deposit of carbonyl of being fit to, can be used to prepare formic acid, methyl alcohol, acetic acid, acid anhydrides, oxalate diester, oxalic acid, ethylene glycol etc.
Compared with prior art, the beneficial effect of technical scheme of the present invention:
1. whole system adopts closed type to design, and can not cause poisonous, harmful, inflammable, explosive danger to surrounding environment.
2. because airtight, system need not carry out nitrogen protection, and extraneous air (oxygen) can not get into system and cause the perhaps danger of blast of burning.
3. need not control system temperature, system can select for use resistant to elevated temperatures material to design or prepare, to guarantee its normally operation more than normal temperature to 500 ℃.
4. wash the discharging that the circulatory system does not produce any form waste water, materials such as dust, tar all are deposited in the sedimentation basin, so the sedimentation basin surface evaporation can not have any peculiar smell; And reach certain proportion when precipitating, the supernatant liquor of sedimentation basin capable of using is washed tail gas.
5. owing to adopt sedimentation basin to collect the solid deposition in the system, because the heat that washing absorbs is discharged through the sedimentation basin surface evaporation, need carry out moisturizing simultaneously to system.So " purifying waste water " that washing utilizes not only can be pure water; Can also be the waste water that can form deposition or flocculation with impurity composition in the hot furnace exhaust gas in ore deposit; For example show acid waste water, have the waste water of organic matter (can form the light component of salt deposition with calcium), therefore circulation washing and sedimentation basin can play the function and the effect of improvement sewage again.
6. the dry dust that forms in the dirt mud that produces in the settling tank and the airtight dust arrester of dust mixes; Can extinguish the kindling material in the dry dust by the moisture content in the dirt mud; When mixing use (burning) with coal, wherein cyanide (cyanic acid calcium salt) decomposes is converted into harmless nitrogen, and calcium ion can generate corresponding calcium salt (calcium sulfite, calcium sulfate etc.) with the sulfide reaction in the coal; And then removed the sulfide in the discharged from coal-fired boiler gas; Use so can be used as desulfurizing agent, and then alleviate coal-fired pollution, reach the production technology of not blowdown of pollution treatment clean environment firendly atmospheric environment.
Description of drawings
Fig. 1 is an ore deposit of the present invention hot furnace exhaust gas process for purifying schematic flow sheet.
The specific embodiment
Technical scheme below in conjunction with the concrete common hot furnace exhaust gas embodiment of the present invention in ore deposit.
Embodiment 1 is the technical scheme of example embodiment of the present invention with the calcium carbide stove exhaust, and the chemical analysis that wherein goes out calcium carbide stove exhaust sees following table 1-1,1-2,1-3 for details.
Table 1-1 goes out the calcium carbide stove exhaust chemical component table
Annotate; Furnace roof awaits strengthening airtight
The chemical composition of dust in the table 1-2 calcium carbide stove exhaust
The fuel gas and dust total amount is 50-250g/m
The particle diameter of dust distributes in the table 1-3 calcium carbide stove exhaust
At first with calcium carbide stove exhaust by the band radiating fin air cooling pipeline closed conveying to gas-solid separator; As above shown in the table, the inlet gas temperature is 300 ℃ to air cooling pipeline inlet gas composition, and inlet gas pressure is 100KPa; Air cooling pipe road exit gas temperature is 150 ℃, exit gas pressure 150KPa.
Secondly the gas behind the air cooling is successively got into first gas-solid separator and second gas-solid separator; Utilization is closed the gas-solid separator that the spiral discharging device of dust feed bin and airtight band material envelope is formed by airtight cyclone separator, band densification; Gas is carried out dry method dust; And the solid dust that will put with pressure automatically concentrates in the airtight dust arrester of dust the formation dry dust.The aerochemistry composition that goes out second gas-solid separator sees following table 1-4 for details; The fuel gas and dust total amount is reduced to 10-50g/m, and chemical analysis does not have to change basically, and the dust size that goes out second gas-solid separator distributes and sees following table 1-5 for details; The gas temperature that goes out second gas-solid separator is 100 ℃, and pressure is 10KPa.
Table 1-4 goes out the aerochemistry composition table of second gas-solid separator
The particle diameter that table 1-5 goes out dust in the gas of second gas-solid separator distributes
Then gas is introduced the first airtight water washing cleaning device, make gas get into the second airtight water washing cleaning device through compressor, get into airtight panting water washing cleaning device and airtight dewater unit again, the dust content of the exit gas of airtight dewater unit is 0.01g/Nm
3Below, tar content is reduced to 0.01g/Nm
3Below, temperature is 10 ℃, pressure is 5KPa, specifically sees following table 1-6 for details.
The exit gas chemical analysis table of the airtight dewater unit of table 1-6
The 4th, gas gets into the pressure swing adsorption decarbonization device, makes gas further dewater and decarburization, and the exit gas temperature is 20 ℃, and pressure is 2.5MPa, and tar and dust content are all reduced to 0mg/Nm
3Below, obtain being fit to the gas that chemical products are produced, specifically see following table 1-7 for details, this moment, gas ingredients can be used to prepare sodium formate, potassium formate or calcium formate.
Table 1-7 goes out aerochemistry component list behind the pressure swing adsorption decarbonization device
At last; Can carry out further pressure swing adsorption decarbonization, hydrogen etc., smart desulfurization, smart dephosphorization, smart dearsenification, smart dechlorination etc. to tail gas; So that obtain to be fit to carbon one and the synthetic tail gas of carbonyl; This moment, tail gas can be used for preparing formic acid, methyl alcohol, acetic acid, aceticanhydride, oxalate diester, ethylene glycol and oxalic acid, specifically saw following table 1-8 for details.
Table 1-8 goes out aerochemistry component list after pressure swing adsorption decarbonization and hydrogen, smart desulfurization, smart dephosphorization, smart dearsenification, the smart dechlorination
Embodiment 2 is the technical scheme of example embodiment of the present invention with the silicomanganese furnace exhaust gas, and the chemical analysis that wherein goes out the silicomanganese furnace exhaust gas sees following table 2-1,2-2,2-3 for details.
Table 2-1 goes out silicomanganese furnace exhaust gas chemical component table
The chemical composition of dust in the table 2-2 silicomanganese furnace exhaust gas
The fuel gas and dust total amount is 50-250g/m
The particle diameter of dust distributes in the table 2-3 silicomanganese furnace exhaust gas
At first with the silicomanganese furnace exhaust gas by the band radiating fin air cooling pipeline closed conveying to gas-solid separator; As above shown in the table, the inlet gas temperature is 750 ℃ to air cooling pipeline inlet gas composition, and inlet gas pressure is 50KPa; Air cooling pipe road exit gas temperature is 400 ℃, exit gas pressure 100KPa.
Secondly the gas behind the air cooling is successively got into first gas-solid separator and second gas-solid separator; Utilization is closed the gas-solid separator that the spiral discharging device of dust feed bin and airtight band material envelope is formed by airtight cyclone separator, band densification; Gas is carried out dry method dust; And the solid dust that will put with pressure automatically concentrates in the airtight dust arrester of dust the formation dry dust.The aerochemistry composition that goes out second gas-solid separator sees following table 2-4 for details; The fuel gas and dust total amount is reduced to 10-50g/m, and chemical analysis does not have to change basically, and the dust size that goes out second gas-solid separator distributes and sees following table 2-5 for details; The gas temperature that goes out second gas-solid separator is 200 ℃, and pressure is 30KPa.
Table 2-4 goes out the aerochemistry composition table of second gas-solid separator
The particle diameter that table 2-5 goes out dust in the gas of second gas-solid separator distributes
Then gas is introduced the first airtight water washing cleaning device, make gas get into the second airtight water washing cleaning device through compressor, get into airtight panting water washing cleaning device and airtight dewater unit again, the dust content of the exit gas of airtight dewater unit is 0.01g/Nm
3Below, tar content is reduced to 0.01g/Nm
3Below, temperature is 35 ℃, pressure is 15KPa, specifically sees following table 2-6 for details.
The exit gas chemical analysis table of the airtight dewater unit of table 2-6
The 4th, gas gets into the pressure swing adsorption decarbonization device, makes gas further dewater and decarburization, and the exit gas temperature is 25 ℃, and pressure is 4MPa, and tar and dust content are all reduced to 0mg/Nm
3Below, obtain being fit to the gas that chemical products are produced, specifically see following table 2-7 for details, this moment, gas ingredients can be used to prepare sodium formate, potassium formate or calcium formate.
Table 2-7 goes out aerochemistry component list behind the pressure swing adsorption decarbonization device
At last; Can carry out further pressure swing adsorption decarbonization, hydrogen and smart desulfurization, smart dephosphorization, smart dearsenification, smart dechlorination to tail gas; So that obtain to be fit to carbon one and the synthetic tail gas of carbonyl; This moment, tail gas can be used for preparing formic acid, methyl alcohol, acetic acid, aceticanhydride, oxalate diester, ethylene glycol and oxalic acid, specifically saw following table 2-8 for details.
Table 2-8 goes out aerochemistry component list after pressure swing adsorption decarbonization, hydrogen, smart desulfurization, smart dephosphorization, smart dearsenification, the smart dechlorination
Embodiment 3 is the technical scheme of example embodiment of the present invention with the another kind of calcium carbide stove exhaust that component is different from embodiment 1, and the chemical analysis that wherein goes out calcium carbide stove exhaust sees following table 3-1,3-2,3-3 for details.
Table 3-1 goes out the calcium carbide stove exhaust chemical component table
The chemical composition of dust in the table 3-2 calcium carbide stove exhaust
The fuel gas and dust total amount is 50-250g/m
The particle diameter of dust distributes in the table 3-3 calcium carbide stove exhaust
At first with calcium carbide stove exhaust by the band radiating fin air cooling pipeline closed conveying to gas-solid separator; As above shown in the table, the inlet gas temperature is 600 ℃ to air cooling pipeline inlet gas composition, and inlet gas pressure is 100KPa; Air cooling pipe road exit gas temperature is 350 ℃, exit gas pressure 150KPa.
Secondly the gas behind the air cooling is successively got into first gas-solid separator and second gas-solid separator; Utilization is closed the gas-solid separator that the spiral discharging device of dust feed bin and airtight band material envelope is formed by airtight cyclone separator, band densification; Gas is carried out dry method dust; And the solid dust that will put with pressure automatically concentrates in the airtight dust arrester of dust the formation dry dust.The aerochemistry composition that goes out second gas-solid separator sees following table 3-4 for details; The fuel gas and dust total amount is reduced to 10-50g/m, and chemical analysis does not have to change basically, and the dust size that goes out second gas-solid separator distributes and sees following table 3-5 for details; The gas temperature that goes out second gas-solid separator is 300 ℃, and pressure is 50KPa.
Table 3-4 goes out the aerochemistry composition table of second gas-solid separator
The particle diameter that table 3-5 goes out dust in the gas of second gas-solid separator distributes
Then gas is introduced the first airtight water washing cleaning device, make gas get into the second airtight water washing cleaning device through compressor, get into airtight panting water washing cleaning device and airtight dewater unit again, the dust content of the exit gas of airtight dewater unit is 0.01g/Nm
3Below, tar content is reduced to 0.01g/Nm
3Below, temperature is 50 ℃, pressure is 20KPa, specifically sees following table 3-6 for details.
The exit gas chemical analysis table of the airtight dewater unit of table 3-6
The 4th, gas gets into the pressure swing adsorption decarbonization device, makes gas further dewater and decarburization, and the exit gas temperature is 20 ℃, and pressure is 6MPa, and tar and dust content are all reduced to 0mg/Nm
3Below, obtain being fit to the gas that chemical products are produced, specifically see following table 3-7 for details, this moment, gas ingredients can be used to prepare sodium formate, potassium formate or calcium formate.
Table 3-7 goes out aerochemistry component list behind the pressure swing adsorption decarbonization device
At last; Can carry out further pressure swing adsorption decarbonization, hydrogen etc., smart desulfurization, smart dephosphorization, smart dearsenification, smart dechlorination etc. to tail gas; So that obtain to be fit to carbon one and the synthetic tail gas of carbonyl; This moment, tail gas can be used for preparing formic acid, methyl alcohol, acetic acid, aceticanhydride, oxalate diester, ethylene glycol and oxalic acid, specifically saw following table 3-8 for details.
Table 1-8 goes out aerochemistry component list after pressure swing adsorption decarbonization, hydrogen, smart desulfurization, smart dephosphorization, smart dearsenification, the smart dechlorination
In the foregoing description, in the water washing cleaning process that the most of harmful substance in the tail gas is soluble in water, and then from gas, remove.Because the oxide of alkalinous metal is soluble in water, show alkalescence, and alkaline solution self has flocculation (like calcium oxide); In addition as time passes; Cyanogen, arsenic can react with the alkalinous metal in the alkaline water, generate cyanogen salt, arsenic salt, in settling tank, produce deposition then.Washing tar also can contact with alkaline aqueous solution and form deposition such as calcium salt, and most of heavy ends tar then can precipitate in sedimentation basin with dust.The tar of these depositions, salt, dust have all constituted dirt mud.In system, dust collecting system can be set, gas-solid separator concentrates on the solid dust of putting with pressure automatically in the airtight dust arrester of dust after gas and solids are left, and forms dry dust.Both mix each other, can extinguish the kindling material in the dry dust by the moisture content in the dirt mud, when mixing use (burning) with coal; Wherein cyanide (cyanic acid calcium salt) decomposes is converted into harmless nitrogen; Calcium ion can generate corresponding calcium salt (calcium sulfite, calcium sulfate etc.) with the sulfide reaction in the coal, and then has removed the sulfide in the discharged from coal-fired boiler gas, uses so can be used as desulfurizing agent; And then alleviate coal-fired pollution to atmospheric environment, reach the production technology of not blowdown of pollution treatment clean environment firendly.
More than the present invention has been done exemplary description; Should be noted that; Under the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (8)
1. a method that purifies closed submerged furnace exhaust gas is characterized in that, carries out according to following step:
At first; The gas that the hot stove production in ore deposit is produced gets into the air cooling pipeline that is provided with radiating fin by the bleed pipeline of furnace roof, and closed conveying also cools to gas-solid separator simultaneously; Air cooling pipeline import department gas temperature is 300-1000 ℃; Pressure is-100 to+100KPa, and air cooling pipeline exit gas temperature is 150-500 ℃, and pressure is-150 to+150KPa
Secondly; Gas gets into first gas-solid separator and second gas-solid separator by the air cooling pipeline; The spiral discharging device that said first gas-solid separator and second gas-solid separator close dust feed bin and airtight band material envelope by airtight cyclone separator, band densification is formed, and is provided with air blast between two gas-solid separators, and the exit gas temperature of second gas-solid separator is 100-400 ℃; Pressure is 10-50KPa, and tar content is reduced to 1-4g/Nm
3, dust content is reduced to 10-50g/Nm
3
The 3rd; Gas gets into the first airtight water washing cleaning device by the outlet of second gas-solid separator; Make gas get into the second airtight water washing cleaning device through compressor, get into airtight panting water washing cleaning device and airtight dewater unit again, the dust content of the exit gas of airtight dewater unit is at 0.01g/Nm
3Below, tar content is reduced to 0.01g/Nm
3Below, temperature is 10-50 ℃, pressure is 5-20KPa
The 4th, gas gets into the pressure swing adsorption decarbonization device after getting into desulfurization and dephosphorization device again, makes gas removal sulphur and phosphorus also further dewater and decarburization, and the exit gas temperature is 20-25 ℃, and pressure is 2.5-40MPa, and tar and dust content are all reduced to 0mg/Nm
3, obtain being fit to the gas that chemical products are produced.
2. a kind of method that purifies closed submerged furnace exhaust gas according to claim 1; It is characterized in that; The employing cyclic design of using in the first airtight water washing cleaning device, the second airtight water washing cleaning device, airtight panting water washing cleaning device and the airtight dewater unit of purifying waste water; Promptly utilizing purifies waste water washes tail gas in the first airtight water washing cleaning device, the second airtight water washing cleaning device and airtight panting water washing cleaning device, absorbs dust, tar, heat and trace acidic gas, after the absorption purify waste water with airtight dewater unit in deviate from purify waste water to be back to and produce deposition in the settling tank; Form dirt mud, supernatant recycles simultaneously.
3. a kind of method that purifies closed submerged furnace exhaust gas according to claim 2 is characterized in that, gas-solid separator concentrates on the solid dust of putting with pressure automatically in the airtight dust arrester of dust after gas and solids are left, and forms dry dust.
4. a kind of method that purifies closed submerged furnace exhaust gas according to claim 1; It is characterized in that; After obtaining to be fit to the gas of chemical products production; Gas is carried out further pressure swing adsorption decarbonization and hydrogen, smart desulfurization, smart dephosphorization, smart dearsenification, smart dechlorination, to prepare final carbon one and the synthetic hot furnace exhaust gas in ore deposit of carbonyl of being fit to.
5. a kind of method that purifies closed submerged furnace exhaust gas according to claim 1 is characterized in that, the said first airtight water washing cleaning device is made up of 1-3 airtight washing unit; The said second airtight water washing cleaning device is made up of 1-3 airtight washing unit; Said airtight panting water washing cleaning device is made up of 1-3 airtight washing unit; Said airtight dewater unit is made up of 1-3 airtight dewatering unit.
6. a kind of method that purifies closed submerged furnace exhaust gas according to claim 3 is characterized in that, the dry dust that forms in the dirt mud that produces in the settling tank and the airtight dust arrester of dust mixes use, and coal-burning boiler is carried out desulfurization.
7. the application of the hot furnace exhaust gas in purification ore deposit of method preparation according to claim 1 in preparation sodium formate, potassium formate or calcium formate.
8. the application of the hot furnace exhaust gas in purification ore deposit of method preparation according to claim 4 in preparation formic acid, acetic acid, aceticanhydride, diethy-aceto oxalate, ethylene glycol and oxalic acid.
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| CN1391077A (en) * | 2002-06-07 | 2003-01-15 | 戴若 | Semi-closed tailgas cleaning technology for calcium carbide roaster |
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| DE4313662A1 (en) * | 1993-01-25 | 1994-07-28 | Mannesmann Ag | Process for using the energy contained in the shaft furnace blast furnace gas |
| CN1391077A (en) * | 2002-06-07 | 2003-01-15 | 戴若 | Semi-closed tailgas cleaning technology for calcium carbide roaster |
| CN101648858A (en) * | 2009-09-04 | 2010-02-17 | 傅永茂 | Process for producing acetic acid by utilizing tail gas of calcium carbide furnace |
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