CN101613111A - A kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid - Google Patents
A kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid Download PDFInfo
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Abstract
The present invention relates to a kind of method of producing bubble flower alkali, and the method that reclaims sulfur dioxide to produce sulfuric acid simultaneously, the sulfur method technical field belonged to.A kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid is characterized in that with the Sodium sulfate anhydrous.min(99) being raw material, with pure oxygen or oxygenized air combustion supporting production bubble flower alkali, improves sulfur in smoke concentration, and technological process as shown in Figure 3.The present invention is raw material with the Sodium sulfate anhydrous.min(99), with oxygen-enriched combustion-supporting production bubble flower alkali, improved sulfur in smoke concentration, can reclaim sulfurous gas in order to produce sulfuric acid, eliminated the secondary pollution of traditional flue gas desulfurization simultaneously, huge environmental benefit, social benefit, economic benefit have been arranged.
Description
One, technical field
The present invention relates to a kind of method of producing bubble flower alkali, and the method that reclaims sulfur dioxide to produce sulfuric acid simultaneously, the sulfur method technical field belonged to.
Two, background technology
Soda ash is raw material production bubble flower alkali, pollute lighter, but cost height.Sodium sulfate anhydrous.min(99) is that raw material production bubble flower alkali cost is low, but pollutes heavy.How to accomplish both to reduce cost, reduce again and pollute, reclaim useful resource simultaneously.
Bubble flower alkali (having another name called water glass) is a kind of Chemicals of having many uses, and is widely used in many aspects such as building, casting, electric power, refractory materials, washing composition, silica gel, tackiness agent, and its molecular formula generally can be written as Na
2OnSiO
2Sodium silicate production process can be divided into two kinds of dry method and wet methods, and wet process technique is quartz sand, sodium hydroxide → dissolve → fluid bubble flower alkali through steam, because the bubble of wet production flower alkali poor quality, modulus are low, so industrially seldom adopt.Dry technology for production is with quartz sand (SiO
2), soda ash (Na
2CO
3) or Sodium sulfate anhydrous.min(99) (Na
2SO
4) enter in the bubble flower alkali calcining furnace after mixing by a certain percentage and form through the high temperature congruent melting.Usually employed is the solid bubble flower alkali of dry production, becomes the fluid bubble flower alkali of required specification again through the steam heating dissolution transitions.Traditional bubble flower alkali calcining furnace all adopts the mode of direct fire coal or fuel oil to heat, but direct coal-fired furnace temperature is low, and to influence in output and the product impurity more, though and directly fuel oil has solved furnace temperature and impurity problem,, do not afford to do economically because cost is too high.
The production of bubble flower alkali, as if being raw material with quartz sand, soda ash, though light to topsoil, high production cost makes enterprise be difficult to bear.But as if being raw material with quartz sand, Sodium sulfate anhydrous.min(99), though reduced production cost, increased enterprise profit, its cost is to make environment be subjected to pollution.How to accomplish both to have reduced the production cost of enterprise, free from environmental pollution again, realize " doulbe-sides' victory " central issue of this paper discussion that Here it is.
The present situation situation of bubble flower alkali production at present:
Great majority bubble flower alkali manufacturing enterprise all adopts raw coal to make coal gas fed to boiler incendiary technology at present, and its advantage one is that cost is low; The 2nd, the furnace temperature height can be accomplished continuous discharging, and output is big; The 3rd, stable; The 4th, good product quality.
Its production process as shown in Figure 2.
Soda ash (yellow soda ash) is raw material:
Chemical equation is: Na2CO3+nSiO2 → Na2OnSiO3+CO2 ↑
Quartz sand, soda ash → mixing → calcining → shrend → solid bubble flower alkali → dissolve → fluid bubble flower alkali through steam
Anhydrous sodium sulphate (Sodium sulfate anhydrous.min(99)) is a raw material:
Na
2SO
4+C+nSiO
2→Na
2O·nSiO
2+1/2CO
2↑+SO
2↑
Quartz sand, anhydrous sodium sulphate (Sodium sulfate anhydrous.min(99)), coal dust → mixing → calcining → shrend → solid bubble flower alkali → dissolve → fluid bubble flower alkali through steam
In the Sodium sulfate anhydrous.min(99) production bubble flower alkali process to the pollution of environment and the waste of resource: early stage bubble flower alkali production, be that employing quartz sand and soda ash are raw material mostly, but because the complex manufacturing of soda ash, price is higher, and China's Sodium sulfate anhydrous.min(99) aboundresources and price are far below soda ash, so replace soda ash with Sodium sulfate anhydrous.min(99) gradually, to reduce production costs.Production process of the two and production technique are basic identical, but aspect chemical reaction, are that each sodium oxide of raw material will consume 1 carbon more with sodium sulfate, and fecund is given birth to a sulfurous gas.Along with The development in society and economy; further going deep into of environmental protection work, also more and more tighter to the emission request of sulfurous gas, traditional is that the production technique of raw material is owing to discharge a large amount of sulfurous gas in the production process with the Sodium sulfate anhydrous.min(99); thereby increased the weight of the formation of acid rain, caused environmental pollution.
In order to strengthen control to sulfur dioxide pollution, on January 12nd, 1998, State Council has issued " State Council is about the reply of acid rain control district and sulfur dioxide pollution control region related problems ", has marked acid rain control district and sulfur dioxide control district first in China and has proposed concrete control requirement.2006, proposed the slogan of " energy-saving and emission-reduction " again and required each province, city to propose concrete reduction of discharging plan and scheme.And be the traditional processing technology of raw material production bubble flower alkali with the Sodium sulfate anhydrous.min(99), because sulphur dioxide emission are big, become primary reduction of discharging object naturally.It is raw material production bubble flower alkali that many areas have expressly banned use of Sodium sulfate anhydrous.min(99), and this production cost that will cause steeping colored alkali increases considerably.
Sulfurous gas is a kind of atmospheric polluting material that produces owing to mankind's activity, is to make one of arch-criminal that atmosphere polluted.But sulfurous gas also is a kind of important chemical material simultaneously, is the vitriolic raw materials for production of one of most widely used mineral acid.As seen, be sulfurous gas equally, if row then is a kind of deleterious pollutent to atmosphere; But, then be a kind of important resource if recycle.Yet, the sulfurous gas in all kinds of waste gas that mankind's activity produces, the overwhelming majority does not obtain recycling and directly arranges to atmosphere, has caused environmental pollution.
With common purposes 3.2 modulus (modulus=SiO more widely
2With Na
2The molecular ratio of O, the quantity discharged of the low more S2O of modulus is big more) the production of bubble flower alkali calculate, the proportioning raw materials in its production process is 1.35 tons of quartz sand/1 ton Sodium sulfate anhydrous.min(99), in bubble flower alkali calcining furnace after high-temperature fusion, produce the bubble flower alkali of 1.9 ton of 3.2 modulus, discharge 0.45 ton of sulfurous gas simultaneously.Sodium sulfate anhydrous.min(99) decomposition reaction equation is:
Na
2SO
4+C+→Na
2O+1/2CO
2↑+SO
2↑
As from the foregoing, 1 ton of bubble flower of every production alkali needs to consume 0.526 ton of Sodium sulfate anhydrous.min(99), produces 0.237 ton of sulfurous gas; In addition, 1 ton of bubble flower of the every production of traditional technology alkali need consume 0.4 ton in raw coal approximately, if the sulphur content in the raw coal is 1.5%, burning yield is 85%, then produces 0.01 ton of sulfurous gas; Add up to 1 ton of bubble flower of every production alkali, common property is given birth to 0.247 ton of sulfurous gas, a bubble flower alkali production line of producing 100000 tons per year, 2.47 ten thousand tons of sulfurous gas of annual generation, the 1000000 tons of sulfurous gas that raw coal produced that are equivalent to burn are year consumption of coal of 200,000 kilowatts of generating set.And one 200,000 kilowatts its annual value of production of generating set and profits tax all are tens times of 100,000 tons of bubble flower alkali, undoubtedly, keep rapid development of economy, reduce the discharging of sulfurous gas simultaneously, and the sulfur dioxide pollution that solution bubble flower alkali is produced is imperative.
Solve the traditional method of sulfur dioxide pollution: the sulfur dioxide pollution that solution bubble flower alkali production is at present produced has Liang Tiaolu, and the one, install desulfurizer additional; The 2nd, change raw material, replace Sodium sulfate anhydrous.min(99) with soda ash.Yet though these two kinds of methods are effective, high investment and working cost are that the present economic situation of China is difficult to bear.
(1) installs desulfurizer additional
The desulfurization of bubble flower alkali flue gas, still there is not proven technique at present, the example that does not also have operation, and the limestone/lime-gypsum method of power-plant flue gas is the sulfur removal technology that technology is the most ripe in the world, operation conditions is the most stable at present, and the flue gas desulfurization expense and this technology of therefore using the power plant of discharging same amount sulfurous gas compare.
According to the data introduction, the limestone/lime-gypsum method flue gas desulfurization device one-time investment of 200,000 kilowatts of coal-fired units of one cover is about 16,000 ten thousand yuan, its desulphurization cost is 1.75 yuan/kilogram (comprising equipment amortization), calculates by this, and the working cost that removes 2.4 ten thousand tons of sulfurous gas is a forty-two million unit.
That is: annual operating and maintenance cost increases forty-two million unit.
Compare with thermal power plant, the exhaust gas volumn of bubble flower alkali will be less than thermal power plant far away, but the concentration of sulfurous gas is higher than thermal power plant far away, and the flue gas desulfurization of limestone/lime-gypsum method, its investment and working cost all are that removal amount with sulfurous gas is main foundation, if take this method to carry out desulfurization, one-time investment and working cost also only can slightly reduce.So high expense is that present enterprise is unaffordable.
(2) change raw material, replace Sodium sulfate anhydrous.min(99) with soda ash
Replace Sodium sulfate anhydrous.min(99) with soda ash, its production technique is identical with Sodium sulfate anhydrous.min(99), does not need to increase investment basically.But the price of soda ash is far above Sodium sulfate anhydrous.min(99), and its production cost increases greatly.Produce 100000 tons of bubble flower alkali per year, need 5.26 ten thousand tons of Sodium sulfate anhydrous.min(99).If use soda ash, then need 3.93 ten thousand tons.By the existing market situation relatively, the Sodium sulfate anhydrous.min(99) price is about 400 yuan/ton (if then price is lower for the byproduct that produces in the employing chemical process), and the soda ash price is about 1950 yuan/ton, and two kinds of different raw materials cost price differences are as follows:
5.26 ten thousand yuan of * 400=2104
3.93 ten thousand yuan of * 1950=7663.5
Different raw material year raw materials cost differ ten thousand yuan of 7663.5-2104=5559.5.
That is: annual operating and maintenance cost increases by 5559.5 ten thousand yuan.
Create conditions; reclaim resource; protection environment: if the sulfurous gas that will reclaim in the waste gas is used to produce sulfuric acid; essential condition is exactly that sulfur dioxide concentration in the waste gas must reach certain numerical value; otherwise the conversion procedure of sulfuric acid production line can't the maintenance heat balance, causes whole sulfate system to move.Traditional bubble flower alkali production, owing to use air-breathing, major part is nitrogen and carbonic acid gas in its flue gas, the concentration of sulfurous gas is very low, can't satisfy the needs of gas washing in SA production.
Three, summary of the invention
The objective of the invention is to solve above-mentioned prior art and produce the problem that bubble flower alkali exists, provide a kind of sulfurous gas that can reclaim in order to produce sulfuric acid, eliminated the secondary pollution of traditional flue gas desulfurization simultaneously, the processing method of the production bubble flower alkali of huge environmental benefit, social benefit, economic benefit has been arranged.
A kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid of the present invention, special character is with the Sodium sulfate anhydrous.min(99) to be raw material, replace air-breathing production bubble flower alkali with pure oxygen (or oxygen-rich air), improved sulfur in smoke concentration, created favourable condition for the recycling of sulfurous gas, technological process as shown in Figure 3;
Specific embodiment is as follows:
1) in producer gas generator, adds coal and oxygen-rich air, generate coal gas;
2) coal gas that generates is entered in the calcining furnace with oxygen-rich air burn, adding simultaneously coal dust, quartz sand, Sodium sulfate anhydrous.min(99) in stove calcines, under 1300-1380 ℃ high temperature, coal dust is burned, quartz sand and Sodium sulfate anhydrous.min(99) then produce congruent melting and generate bubble flower alkali, discharge sulfurous gas simultaneously and discharge with the flue gas that burning produces;
3) produce the flue gas of bubble flower alkali generation through dedusting, after cooling system is handled (entering the supporting flue gas washing system of traditional sulfuric acid production system through the flue gas behind the recovery waste heat), add the needed oxygen-rich air of conversion and enter heat exchanger together, after heat exchange, reach 390-400 ℃ and enter converter, under the effect of alum catalyst, sulfurous gas is oxidized to sulphur trioxide (SO2+1/2O2=SO3), the high-temperature gas (about 580-600 ℃) that goes out converter still enters heat exchanger and is used to heat the into unstripped gas of converter, absorb with dilute sulphuric acid then and promptly become product sulfuric acid, its chemical equation is SO3+H2O=H2SO4, and sulfur in smoke has obtained reclaiming and making sulfuric acid;
4) bubble of molten state flower alkali flows directly in the tank after discharge port flows out voluntarily in the calcining furnace, enters separate tank by the direct cooling of water coolant and with water, cooling water circulation use, and this process is called shrend, obtains solid bubble flower alkali product after the shrend.
Traditional sulfuric acid production process is that bubbling air in incinerator burns with sulphur or sulfurous iron ore, the gas that contains sulfurous gas that generates is after dedusting, be equipped with an amount of air admission converter again, under the effect of alum catalyst, making Sulphur Dioxide is sulphur trioxide, absorbs with dilute sulphuric acid at last to form.
Required oxygen-rich air in the production process is by the air separation equipment supply.
The present invention is raw material with the Sodium sulfate anhydrous.min(99), with oxygen-enriched combustion-supporting production bubble flower alkali, improved sulfur in smoke concentration, can reclaim sulfurous gas in order to produce sulfuric acid, eliminated the secondary pollution of traditional flue gas desulfurization simultaneously, huge environmental benefit, social benefit, economic benefit have been arranged.
Four, description of drawings
Fig. 1: embodiment 1 produces the process schematic representation of sodium silicate and recovering sulfur dioxide to produce sulfuric acid;
Fig. 2: prior art is produced the process flow sheet of bubble flower alkali;
Fig. 3: the present invention produces the process flow sheet of sodium silicate and recovering sulfur dioxide to produce sulfuric acid.
Five, embodiment
Following with reference to accompanying drawing, provide the specific embodiment of the present invention, be used for that the invention will be further described.
Embodiment 1
Present embodiment is with reference to figure 1, and a kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid is a raw material with the Sodium sulfate anhydrous.min(99), replaces air with pure oxygen (or oxygen-rich air) and produces coal gas and combustion-supporting production bubble flower alkali, and technological process as shown in Figure 3;
Specific embodiment is as follows:
1) in producer gas generator, adds coal and oxygen-rich air, generate coal gas;
2) coal gas that generates is entered in the calcining furnace with oxygen-rich air burn, adding simultaneously coal dust, quartz sand, Sodium sulfate anhydrous.min(99) in stove calcines, under 1300-1380 ℃ high temperature, coal dust is burned, quartz sand and Sodium sulfate anhydrous.min(99) then produce congruent melting and generate bubble flower alkali, discharge sulfurous gas simultaneously and discharge with the flue gas that burning produces;
3) produce the flue gas of bubble flower alkali generation through dedusting, after cooling system is handled (entering the supporting flue gas washing system of traditional sulfuric acid production system through the flue gas behind the recovery waste heat), add the needed oxygen-rich air of conversion and enter heat exchanger together, after heat exchange, reach 390-400 ℃ and enter converter, under the effect of alum catalyst, sulfurous gas is oxidized to sulphur trioxide (SO2+1/2O2=SO3), the high-temperature gas (about 580-600 ℃) that goes out converter still enters heat exchanger and is used to heat the into unstripped gas of converter, absorb with dilute sulphuric acid then and promptly become product sulfuric acid, its chemical equation is SO3+H2O=H2SO4, and sulfur in smoke has obtained reclaiming and making sulfuric acid;
4) bubble of molten state flower alkali flows directly in the tank after discharge port flows out voluntarily in the calcining furnace, enters separate tank by the direct cooling of water coolant and with water, cooling water circulation use, and this process is called shrend, obtains solid bubble flower alkali product after the shrend.
(1) technical feasibility analysis
1, the technical feasibility analysis of bubble flower alkali production
The production technology of bubble flower alkali is simpler, and is reinforced by proportioning, and the height of its output size and quality then depends on the temperature of calcining furnace substantially.With pure oxygen (or oxygen-rich air) system coal gas, with combustion-supporting with pure oxygen (or oxygen-rich air), its temperature of combustion will be higher than uses air then.Obviously, its output and quality also are higher than and use air-breathing.Simultaneously, owing to use pure oxygen (or oxygen-rich air), the one, the oxygen concn height can reduce the volume of producer gas generator, reduces investment; The 2nd, the calcining furnace exhaust gas volumn reduces (being about in theory with air-breathing 22%), and the volume of calcining furnace significantly reduces, and has reduced and has built the stove investment; The 3rd, the calcining furnace volume reduce minimizing with exhaust gas volumn, make heat lost by radiation and heat loss due to exhaust gas reduce, thereby saved the consumption of fuel, reduced production cost.
2, the technical feasibility analysis of gas washing in SA production
Traditional sulfuric acid production process is to burn with sulphur bubbling air in the sulphur incinerator, the gas that contains sulfurous gas that generates is equipped with an amount of air admission converter, under the effect of alum catalyst again after dedusting, making Sulphur Dioxide is sulphur trioxide, absorbs with dilute sulphuric acid at last to form.Chemical reaction in the sulphur incinerator is as follows: sulphur+air → sulfurous gas+nitrogen
From the combined composition of air as can be known, sulfurous gas volumetric concentration ratio is 20% in the combustion gases of generation.But in actual production process in order to put forward the doctor positive rate of combustion, usually add excessive air, sulfur in smoke concentration is generally about 13% in the production, and adding air in certain amount (wherein contained oxygen is to satisfy the needs SO2+1/2O2=SO3 that oxidizing sulfur dioxide becomes sulphur trioxide), to advance the sulfur dioxide concentration of one-level convertor be 7-8%.
Adopt Sodium sulfate anhydrous.min(99)-oxygen-rich air method to produce bubble flower alkali, the while co-producing sulfuric acid, because significantly reducing of exhaust gas volumn, heat lost by radiation and heat loss due to exhaust gas have been reduced, coal consumption also descends thereupon, ton bubble flower alkali consumes 340 kilograms in coal approximately, and ton bubble flower alkali needs 700 cubic metres in oxygen consumption gas (comprising that Sulphur Dioxide is the required excessive oxygen of sulphur trioxide) approximately, and the sulfur in smoke volumetric concentration is about 12% in theory.But in industrial production, add excessive oxygen usually obtaining maximum conversion rate, thereby the sulfur dioxide concentration that advances convertor is about 11%.
As can be seen, compare with traditional sulfuric acid production process, adopting Sodium sulfate anhydrous.min(99)--the pure oxygen method is produced bubble flower alkali, the sulfur in smoke concentration of its generation, be similar to the sulfur in smoke concentration that sulfur burning produces, the needs of gas washing in SA production can be satisfied, combination producing sulfuric acid can be used for fully.
(2) economic feasibility analysis (with produce 100000 tons of bubble flower alkali per year, 40,000 tons of vitriolic production lines are basis)
1, one-time investment contrast
Adopting Sodium sulfate anhydrous.min(99)--pure oxygen production bubble flower alkali, a key issue is exactly the preparation of pure oxygen.At present, domestic sky divides technology and equipment all very ripe, have suite of equipment can supply to select for use, but disposable investment is bigger.The investment changing conditions is as follows:
Increase part: need supporting oxygen generating plant, adopt KDON-6000/6000 type air separation plant two covers, and supporting centrifugal air compressor and ZKG-1200 type self-cleaning air filter, one-time investment is about 3,500 ten thousand yuan.Subtotal increases by 3,500 ten thousand yuan of investments.
Reduce part: compare with traditional technology, the pure oxygen method produce its exhaust gas volumn reduce about 75%, thereby greatly reduce the stove expense of building of bubble flower alkali calcining furnace, it is estimated and can reduce about 4,000,000 yuan of the stove expense of building.
Owing to as the vitriolic raw materials for production, saved the sulphur incinerator, can reduce and build about 1,800,000 yuan of stove and support expense with the flue gas of bubble flower alkali.Subtotal reduces 5,800,000 yuan of investments.
Add up to: 3500-400-180=2920, capital construction investment increases by 2,920 ten thousand yuan.
One 200,000 kilowatts coal fired power generation unit is taked the desulfurization of limestone/lime-gypsum method, and one-time investment is about 16,000 ten thousand yuan.
The two is compared, and the former the output investment ratio latter will lack 13,080 ten thousand yuan, only is the latter's 18.25%.
2, working cost contrast
Increase part: this part is the productive expense of oxygen-rich air, and selecting oxygen purity is 90%, has both satisfied the needs of producing, and (99.6% oxygen power consumption is 0.51KWh/m can to reduce power consumption again
3, 90% oxygen power consumption is 0.44KWh/m
3), every cube of oxygen power consumption 0.44 degree, about 0.31 yuan (commercial power calculates by 0.7 elementary length); Labour cost is less than 0.01 yuan; Equipment amortization (15 years) is about 0.03 yuan; Other subsidiary material are about 0.01 yuan, and adding up to every cube of oxygen cost is 0.36 yuan.
Subtotal ton bubble flower alkali increases by 252 yuan of costs, and a year cost increases by 2,520 ten thousand yuan.
Reduce part: producer gas generator and bubble flower alkali calcining furnace all use pure oxygen, greatly reduce smoke discharge amount, thereby have also reduced thermosteresis.Producer gas generator need be used high-quality coal, and by 1000 yuan of calculating of coal per ton, ton bubble flower alkali reduces about 60 yuan of cost, and a year cost minimizing is about 6,000,000 yuan.
The flue gas that produces has saved the working cost of sulphur incinerator as the raw material of gas washing in SA production, and a year cost minimizing is about 1,500,000 yuan.
Because the volume of bubble flower alkali calcining furnace reduces, year can reduce maintenance cost and be about 2,000,000 yuan.
Year is reclaimed 2.42 ten thousand tons of sulfurous gas, and (99%) 1.247 ten thousand ton in folding sulphur is 1200 yuan of calculating by the sulphur price, about 1,500 ten thousand yuan of year recovery value.
Add up to: ten thousand yuan of 2520-600-150-200-1500=70, a year total cost increases by 700,000 yuan.
One 200,000 kilowatts coal fired power generation unit is taked the desulfurization of limestone/lime-gypsum method, and the cost that removes ton sulfurous gas is about 1750 yuan (comprising equipment amortization), then removes 2.4 ten thousand tons of sulfurous gas, and its expense is a forty-two million unit.
The two is compared, and the former lacks 4,130 ten thousand yuan than the latter by working cost, only is the latter's 1.7%.
(empty divide the back remaining nitrogen, and the pure oxygen method produces the flue gas that bubble flower alkali is produced, after reclaiming sulfurous gas, remaining carbonic acid gas if further reclaim carbonic acid gas and nitrogen again, will produce bigger economic benefit.)
Therefore, adopt Sodium sulfate anhydrous.min(99), pure oxygen method to produce bubble flower alkali, reclaim sulfur dioxide to produce sulfuric acid simultaneously, compare with the traditional method that solves sulfur dioxide pollution, be rational economically.
(3) environmental benefit analysis
1, direct environment benefit: a bubble flower alkali production line of producing 100000 tons per year, can discharge 2.47 ten thousand tons of sulfurous gas (sulphur content of coal is calculated by 1.5%) every year, be equivalent to 24.4% of present whole Yantai City (2007 annual data) sulfur dioxide emissions total amount.If take this technology that sulfurous gas is reclaimed, then can reduce 2.42 ten thousand tons of discharging sulfurous gas every year, be equivalent to more than three times of whole city's emission reduction tasks, environmental benefit is considerable.
2, indirect environmental benefit: a bubble flower alkali production line of producing 100000 tons per year, 5.26 ten thousand tons of year consumption Sodium sulfate anhydrous.min(99), 3.93 ten thousand tons of alternative soda ash.And the discharging of energy consumption in the soda ash production process and pollutent is several times as much as Sodium sulfate anhydrous.min(99) production process produced pollution thing.Substitute soda ash with Sodium sulfate anhydrous.min(99), indirect minimizing energy consumption, also reduced the discharging of pollutent.
Conclusion: with the Sodium sulfate anhydrous.min(99) is that raw material adopts oxygen-rich air production bubble flower alkali, reclaim sulfur dioxide to produce sulfuric acid, its marrow is to become traditional sulfur dioxide removal to be distilled off as recycling, and pollutent is transformed into raw materials for production, meets the requirement of cleaner production in the world today.This technology has four big benefits simultaneously: the one, reduced the discharging of sulfurous gas, and reduced soda ash production produced pollution thing simultaneously, have bigger environmental benefit; The 2nd, utilized the more rich Sodium sulfate anhydrous.min(99) of china natural resources, reclaimed sulfurous gas, saved the sulphur that china natural resources lacks, make the relatively low high sulphur coal of price that higher use value has been arranged simultaneously, have the good social benefit; The 3rd, the sulfurous gas that reclaims is used for vitriolic production, has reduced production cost, has high economic benefit; The 4th, to compare with traditional flue gas desulfurization, its one-time investment only is 18.25% of flue gas desulfurization, and desulphurization cost is about 1.7% of flue gas desulfurization, and non-secondary pollution has operability economically; The quadruple effect unification four gets at one stroke.At present to steeping the exploitation of the desulfurization technology that colored alkali produces, extremely urgent, this technology also is suitable for simultaneously and solves with the phosphogypsum is the by-product vitriolic sulfur dioxide pollution simultaneously of raw material production white cement.
Three kinds of investment and running costs that solve the sulfur dioxide pollution scheme compare (is 100% with power plant)
| 200MW coal fired power generation unit | 100,000 tons of bubble flower alkali, 40,000 tons of sulfuric acid combined production lines | 100,000 tons of bubble flower alkali production lines | |
| Production technique | The desulfurization of limestone/lime-gypsum method | Oxygen-rich air, Sodium sulfate anhydrous.min(99), quartz sand, sulfur dioxide to produce sulfuric acid | Soda ash, quartz sand |
| One-time investment | 16,000 ten thousand yuan | 2,920 ten thousand yuan | ??0 |
| Ratio between investments | ??100％ | ??18.25％ | ??0 |
| Year newly-increased running cost | Forty-two million unit | 700,000 yuan | 5559.5 ten thousand yuan |
| The expense ratio | ??100％ | ??1.7％ | ??132.4％ |
| The sulfurous gas reduction rate | ??90％ | ??98％ | ??96％ |
| The secondary pollution situation | Produce 250,000 tons in waste residue (wet gypsum) year | Do not have | Do not have |
| The complicated operation situation | Complicated | Simply | Simply |
Illustrate: 1, bubble flower alkali, sulfuric acid combined production line do not calculate the profit of vitriolic profit and recovery CO2 and N2 as yet.
2, the coal-fired generator set desulfurization facility one-time investment of 200MW and running cost data are taken from the article reading of China Power net elite district.
3, the year newly-increased running cost of soda ash, quartz sand technology is the price difference of soda ash and Sodium sulfate anhydrous.min(99).
Claims (2)
1, a kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid is characterized in that with the Sodium sulfate anhydrous.min(99) being raw material, with pure oxygen or oxygenized air combustion supporting production bubble flower alkali, improves sulfur in smoke concentration, and technological process as shown in Figure 3.
2, according to the described a kind of processing method of producing sodium silicate and recovering sulfur dioxide to produce sulfuric acid of claim 1, it is characterized in that specific embodiment is as follows
1) in producer gas generator, adds coal and oxygen-rich air, generate coal gas;
2) coal gas that generates is entered in the calcining furnace with oxygen-rich air burn, adding simultaneously coal dust, quartz sand, Sodium sulfate anhydrous.min(99) in stove calcines, under 1300-1380 ℃ high temperature, coal dust is burned, quartz sand and Sodium sulfate anhydrous.min(99) then produce congruent melting and generate bubble flower alkali, discharge sulfurous gas simultaneously and discharge with the flue gas that burning produces;
3) produce the flue gas of bubble flower alkali generation after dedusting, cooling system are handled, add the needed oxygen-rich air of conversion and enter heat exchanger together, after heat exchange, reach 390-400 ℃ and enter converter, under the effect of alum catalyst, sulfurous gas is oxidized to sulphur trioxide, the high-temperature gas that goes out converter still enters heat exchanger and is used to heat the into unstripped gas of converter, absorb with dilute sulphuric acid then and promptly become product sulfuric acid, its chemical equation is SO3+H2O=H2SO4, and sulfur in smoke has obtained reclaiming and making sulfuric acid;
4) bubble of molten state flower alkali flows directly in the tank after discharge port flows out voluntarily in the calcining furnace, enters separate tank by the direct cooling of water coolant and with water, cooling water circulation use, and this process is called shrend, obtains solid bubble flower alkali product after the shrend.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434889A (en) * | 2011-09-07 | 2012-05-02 | 安徽金禾实业股份有限公司 | Method for treating tail gas generated by sulfur dioxide production |
| CN107055488A (en) * | 2017-04-14 | 2017-08-18 | 双盾环境科技有限公司 | High-concentration sulfur dioxide flue gas binary can adjust pre-inversion Sulphuric acid device |
| CN107215878A (en) * | 2017-05-24 | 2017-09-29 | 安徽龙泉硅材料有限公司 | The production technology of high-quality industrial metasilicate |
| CN111994915A (en) * | 2020-08-28 | 2020-11-27 | 山西华康绿色建材有限公司 | Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt |
-
2009
- 2009-06-12 CN CN200910016206A patent/CN101613111A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434889A (en) * | 2011-09-07 | 2012-05-02 | 安徽金禾实业股份有限公司 | Method for treating tail gas generated by sulfur dioxide production |
| CN107055488A (en) * | 2017-04-14 | 2017-08-18 | 双盾环境科技有限公司 | High-concentration sulfur dioxide flue gas binary can adjust pre-inversion Sulphuric acid device |
| CN107055488B (en) * | 2017-04-14 | 2023-04-28 | 双盾环境科技有限公司 | Binary adjustable pre-conversion sulfuric acid preparing device for high-concentration sulfur dioxide flue gas |
| CN107215878A (en) * | 2017-05-24 | 2017-09-29 | 安徽龙泉硅材料有限公司 | The production technology of high-quality industrial metasilicate |
| CN111994915A (en) * | 2020-08-28 | 2020-11-27 | 山西华康绿色建材有限公司 | Method and device for producing sodium silicate and sulfuric acid from high-sulfur-content salt |
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