CN104776727A - Efficient purifying method for exhausted tail gases from firing of gangue baked bricks in portable tunnel kiln - Google Patents
Efficient purifying method for exhausted tail gases from firing of gangue baked bricks in portable tunnel kiln Download PDFInfo
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- CN104776727A CN104776727A CN201510180762.9A CN201510180762A CN104776727A CN 104776727 A CN104776727 A CN 104776727A CN 201510180762 A CN201510180762 A CN 201510180762A CN 104776727 A CN104776727 A CN 104776727A
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Abstract
The invention discloses an efficient purifying method for exhausted tail gases from firing of gangue baked bricks in a portable tunnel kiln. The efficient purifying method comprises the following process steps of stacking raw materials: stacking green gangue bricks and limestone in an annular kiln bottom between annular tracks of the portable tunnel kiln; roasting the green gangue bricks and the limestone in the kiln to desulfurize: roasting the green gangue bricks and the limestone in an arc kiln body according to a certain temperature raising procedure, and performing primary desulfurization by high-temperature roasting; performing wet flue gas desulfurization: feeding the calcined limestone into a desulfurizing liquid adjusting pool, and adjusting the basic strength in the adjusting pool; introducing tail gases in the kiln body into a desulfurizing tower, sprinkling the desulfurizing liquid in the desulfurizing liquid adjusting pool into the desulfurizing tower, and performing secondary desulfurization by a chemical reaction generated in the desulfurizing tower. According to the efficient purifying method disclosed the invention, by the adoption of a combined desulfurization method of desulfurization by roasting in the kiln and the wet flue gas desulfurization, the problems of desulfurization and purification of the tail gases in the portable tunnel kiln are successfully solved; meanwhile, energy sources can be saved, and the purification cost is reduced.
Description
Technical field
The present invention relates to a kind of high-efficiency purifying method of gas, especially a kind of the method for desulfurizing and purifying is carried out to the tail gas that mobile tunnel furnace fires coal gangue baked brick discharge.
Background technology
Mobile tunnel furnace is motionless with the adobe of opposition thinking method design, the sintering brick process system of kiln body movement, the arc kiln running body of mobile tunnel furnace is on two corresponding circular orbits, base to be baked bricks is piled up at the bottom of the ring kiln between the circular orbit in arc kiln body front, arc kiln body travels forward and adobe is brought in arc kiln body, arc kiln body is disposed with dryer section from front to back, preheating section, furnace zone, soaking zone, cooling section, when kiln body moves ahead, from the adobe that kiln Qianmen is included in, movement along with kiln body is completed drying, preheating, roasting, after the operations such as cooling, can at the bottom of the ring kiln opened wide on load and transport the finished bricks that is exposed to outside kiln tail-gate.
Coal gangue baked brick is the one of energy-saving materials for wall; comprise standard brick, porous brick, hollow brick; main replacement solid clay brick is used for permanent construction; colliery wastes brick has the excellent properties such as, carrying anti-seismic performance good, insulation, heat insulation, sound insulation high from heavy and light, intensity, the use of colliery wastes brick for protection and farmland saving, Environment control, alleviating energy crisis, raising building function, improve housing conditions, realize modernization of the housing industry and have major and immediate significance.
Gangue is the solid waste discharged in coal mining process and coal washing process, is a kind of black gray expandable rock lower, harder than coal with a kind of phosphorus content of coal seam association in coalification course.Comprise choose from the spoil of extraction top board, base plate and interlayer and coal washing process in the digging gangue in tunnelling process, mining process wash spoil.Its main component is alundum (Al2O3), silica, in addition also containing quantity not wait the oxide such as iron oxide, calcium oxide, magnesia and sulphur, phosphorus, other micro-rare elements etc.Therefore we are when utilizing waste residue and gangue, also will prevent the secondary pollution that it produces environment.
The tail gas containing a large amount of pernicious gas can be produced in gangue adobe roasting process, these pernicious gases comprise carbon monoxide, carbon dioxide, sulfur dioxide, hydrogen sulfide and a small amount of nitrogen oxide etc., wherein based on sulfur dioxide, if sulfur dioxide (SO2) emissions are in air, comparatively serious environmental pollution can be caused.Do not have the special tail gas clean-up process system designed for mobile tunnel furnace in prior art, therefore, how to purify the tail gas produced in gangue adobe roasting process, become problem demanding prompt solution.
Summary of the invention
The technical issues that need to address of the present invention are to provide the high-efficiency purifying method that a kind of mobile tunnel furnace fires coal gangue baked brick emission, drop into and comparatively succinct processing step solves the problem that existing mobile tunnel kiln exhaust gas cannot purify with lower cost.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Mobile tunnel furnace fires the high-efficiency purifying method of coal gangue baked brick emission, specifically comprises following processing step,
1), raw material is piled up: gangue adobe and lime stone are piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace;
2), desulfurization with roasting technique in kiln: according to certain heating schedule, roasting is carried out to the gangue adobe in arc kiln body and lime stone, by high-temperature roasting, carry out first time desulfurization;
3), wet process of FGD: the lime stone after calcining is put in doctor solution regulating reservoir and base strength in regulating reservoir, tail gas in kiln body to be passed in desulfurizing tower and the doctor solution in doctor solution regulating reservoir is sprayed in desulfurizing tower, by the chemical reaction occurred in desulfurizing tower, carry out second time desulfurization.
Further improvement of the present invention is: the calorific value of the gangue adobe in described step 1) is 1200 ~ 1600kJ/kg, described gangue adobe at the bottom of ring kiln in along the layered stacked one-tenth adobe buttress of the diametric(al) of circular orbit, each adobe buttress comprises the three row adobe rows that parallel and arranges ventilating duct between fan-shaped buttress between adjacent bricks hack.
Further improvement of the present invention is: the width of described adobe row is 45 ~ 55cm, and arrange ventilating duct between the row that width is 10 ~ 30cm between adjacent adobe row, between described buttress, the outer arc width of ventilating duct is 45 ~ 65cm.
Further improvement of the present invention is: in described step 1), the weight ratio of gangue adobe and lime stone is 10:1 ~ 30:1, the particle size range of described lime stone is 50 ~ 250mm, and lime stone is piled up between adobe layer and/or to be piled up between row in ventilating duct and/or pile up ventilating duct between buttress.
Further improvement of the present invention is: described step 2) in the arc kiln body middle high temperature drying section that to comprise temperature range be low temperature drying section, the temperature range of 30 ~ 35 DEG C is 100 ~ 120 DEG C, the temperature range preheating section that is 650 ~ 700 DEG C, temperature range to be furnace zone, the temperature range of 1000 ~ 1050 DEG C the be soaking zone of 800 ~ 900 DEG C and temperature lower than the cooling section of 700 DEG C.
Further improvement of the present invention is: the section between the front end face of described arc kiln body, low temperature drying Duan Yuzhong high temperature drying section and the section between middle high temperature drying section and preheating section arrange Kazakhstan air lock system, and described arc kiln body moved forward the width of three adobes buttress every 2 ~ 3 hours along circular orbit.
Further improvement of the present invention is: the intake of described furnace zone is 40 ~ 45m
3/ min, capacity is 65 ~ 70m
3/ min.
Further improvement of the present invention is: in described step 3), the mass percentage concentration of doctor solution regulating reservoir sodalime stone is 10% ~ 25%, and the pH value of doctor solution is 5 ~ 8, and the conditioning agent of described base strength is NaOH.
Further improvement of the present invention is: the doctor solution Spraying rates in described step 3) is 2 ~ 3m
3/ min, the feed rate of tail gas is 65 ~ 70m
3/ min.
Owing to have employed technique scheme, the technological progress that the present invention obtains is:
Mobile tunnel furnace of the present invention fires the high-efficiency purifying method of coal gangue baked brick emission, adopt the combined desulfurization method of desulfurization with roasting technique and wet process of FGD in kiln, successfully solve the desulfurizing and purifying problem of mobile tunnel kiln exhaust gas, simultaneously can economize energy, save purification cost.
The present invention has some technique effect comparatively given prominence to following:
1, the purification efficiency of exhaust purifying method of the present invention is high.The present invention adopts the combined desulfurization method of desulfurization with roasting technique and wet process of FGD in kiln, and desulfuration efficiency is higher, and tail gas clean-up efficiency is high.
For desulfurization with roasting technique in kiln, can realize directly carrying out desulfurization to tail gas in roasting process, desulphurization reaction process is divided into two steps: calcium oxide and the carbon dioxide of the first step to be calcium carbonate decomposes be porous, and under normal pressure, the reaction temperature of this reactions steps is 898 DEG C; Second step is that calcium oxide and sulfur dioxide and oxygen reaction generate calcium sulfate, and under normal pressure, the reaction temperature of this reactions steps is about 900 DEG C.In arc kiln body, to be the furnace zone of 1000 ~ 1050 DEG C and temperature range be temperature range that the soaking zone of 800 ~ 900 DEG C all above-mentioned reaction can occur, and ensure that desulphurization reaction process has suitable reaction temperature on the one hand, makes the stability of reacting better; Also make lime stone have enough time of staying in comfort zone on the other hand, react fully and carry out.The particle size range limiting lime stone is 50 ~ 250mm, adopt the lime stone of greater particle size, larger gap can be there is when piling up between limestone block, the densification of short grained lime stone of comparing is piled up, these large gaps can realize the smooth diffusion of limestone surfaces gas, namely the carbon dioxide generated is overflowed in time, and outside sulfur dioxide and oxygen enter in time.Lime stone is through the effect of low temperature drying section, middle high temperature drying section, and the moisture in lime stone is vaporized completely, and in the be full of cracks of preheating zone lime stone expanded by heating, crackle appears in surface portion, also ensures the smooth diffusion of gas.These ensure that the desulfuration efficiency of desulfurization with roasting technique in kiln above, make the desulfuration efficiency of desulfurization with roasting technique in kiln up to 40 ~ 60%.By regulating the weight ratio of gangue adobe and lime stone, the desulfurization load in arc kiln body can be regulated.
For wet process of FGD, the doctor solution with certain base strength is made in lime stone hydrolysis after roasting, the tail gas of discharging in arc body of heater is purified further, there is the advantage that reaction speed is fast, desulfuration efficiency is high, other sour gas in tail gas can also be deviate from simultaneously.Tail gas after wet process of FGD, desulfuration efficiency is up to more than 96%.
2, the heat utilization rate of exhaust purifying method of the present invention is high.The calorific value of gangue adobe can be regulated by the ingredient proportion of adobe Raw, the calorific value of gangue adobe regulates usually at 1200 ~ 1600kJ/kg, in roasting process, gangue adobe can be burnt completely and be discharged enough heats, these heats also have after-heat while being enough to that gangue adobe is sintered, and the furnace zone temperature of arc kiln body can reach 1000 ~ 1050 DEG C.The main component of lime stone is calcium carbonate, the mainly decomposition reaction of calcium carbonate in lime stone during roasting, be atmospheric pressure environment in arc kiln body, calcium carbonate decomposition temperature is at ambient pressure 898 DEG C, decomposing caloric receptivity is 1789kJ/kg, temperature in the furnace zone of arc kiln body can meet the needs of Decomposition of Calcium Carbonate completely, also the needs decomposing calcium oxide and the sulfur dioxide generation desulphurization reaction obtained can be met, the required heat absorbed of above-mentioned reaction can be provided by the waste heat after gangue adobe sintering completely, and do not need additionally to add fuel, therefore the heat utilization rate of exhaust purifying method of the present invention is high.
3, the concise in technology of exhaust purifying method of the present invention, environmental benefit is high.Process for purifying of the present invention mainly comprises that raw material is piled up, desulfurization with roasting technique and wet process of FGD in kiln, link is piled up at raw material, the work of piling up can be completed completely by mechanical arm, the temperature programming of firing stage in kiln, also can be completely achieved Automated condtrol, also can realize Automated condtrol in wet process of FGD link.Whole technical process can also realize omnidistance on-line monitoring simultaneously.Enter production line to finished bricks kiln discharge from raw material, reduce the pollution to environment in process of producing product substantially.
4, the high financial profit of exhaust purifying method of the present invention.The present invention directly adopts cheap lime stone as the raw material of tail gas clean-up, and input cost is lower.Desulfurization with roasting technique link in kiln, utilizes the waste heat after gangue adobe roasting to carry out desulphurization reaction, without the need to extra fuel or combustion adjuvant.In wet process of FGD link, doctor solution is hydrolyzed by the lime stone after roasting and makes, do not need additionally to buy lime stone, only need extra interpolation base strength conditioning agent, lime stone can be utilized completely in whole tail gas clean-up process, and the lime that roasting of the present invention simultaneously goes out also can be used as construction material and sells, in sum, exhaust purifying method of the present invention has saved operating cost, has higher economic benefit.
Detailed description of the invention
Mobile tunnel furnace fires the high-efficiency purifying method of coal gangue baked brick emission, and mobile tunnel furnace provides installation by stove automation equipment company of Xi'an power unit.Arc kiln running body is on Crossed Circle track, the annular diameters of ring rail is 125 meters, the centerline length of arc kiln body is 150 meters, width is 12 meters, be highly 1.48 meters, the section between the front end face of arc kiln body, low temperature drying Duan Yuzhong high temperature drying section and the section between middle high temperature drying section and preheating section arrange Kazakhstan air lock system.
High-efficiency purifying method of the present invention specifically comprises following processing step,
1), raw material is piled up: gangue adobe and lime stone are piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace;
2), desulfurization with roasting technique in kiln: according to certain heating schedule, roasting is carried out to the gangue adobe in arc kiln body and lime stone, by high-temperature roasting, carry out first time desulfurization;
3), wet process of FGD: the lime stone after calcining is put in doctor solution regulating reservoir and base strength in regulating reservoir, tail gas in kiln body to be passed in desulfurizing tower and the doctor solution in doctor solution regulating reservoir is sprayed in desulfurizing tower, by the chemical reaction occurred in desulfurizing tower, carry out second time desulfurization.
Embodiment 1
The preparation of gangue standard brick adobe.With gangue, flyash, soft shale, refuse soil for primary raw material, feed intake according to following percentage by weight: 70% gangue, 5% flyash, 20% soft shale, 5% refuse soil, sends into ageing storehouse after adding water and mixing carry out ripening through crusher in crushing, mixer, after abundant ageing, through mixing extruder add water stirring extrude grind refining, then enter vacuum extruder extrusion molding, prepare the standard brick adobe being of a size of 240mm × 115mm × 53mm.After tested, the calorific value of gangue standard brick adobe is 1330kJ/kg.
Embodiment 2
The preparation of coal gangue perforated brick adobe.With gangue, flyash, soft shale, refuse soil for primary raw material, feed intake according to following percentage by weight: 75% gangue, 5% flyash, 15% soft shale, 5% refuse soil, send into ageing storehouse after adding water and mixing carry out ripening through crusher in crushing, mixer, after abundant ageing, through mixing extruder add water stirring extrude grind refining, then enter vacuum extruder extrusion molding, prepare the porous brick adobe being of a size of 240mm × 115mm × 90mm, hole ratio >=25% of porous brick adobe.After tested, the calorific value of coal gangue perforated brick adobe is 1380kJ/kg.
Embodiment 3
The preparation of gangue hollow block adobe.With gangue, flyash, soft shale, refuse soil for primary raw material, feed intake according to following percentage by weight: 80% gangue, 5% flyash, 10% soft shale, 5% refuse soil, send into ageing storehouse after adding water and mixing carry out ripening through crusher in crushing, mixer, after abundant ageing, through mixing extruder add water stirring extrude grind refining, then vacuum extruder extrusion molding is entered, prepare the building-block adobe being of a size of 240mm × 115mm × 190mm, hole ratio >=40% of building-block adobe.After tested, the calorific value of gangue hollow block adobe is 1460kJ/kg.
Embodiment 4
The gangue standard brick adobe of preparation in embodiment 1 is piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace, along the layered stacked one-tenth adobe buttress of the diametric(al) of circular orbit at the bottom of ring kiln, each adobe buttress comprises the three row's adobe rows paralleled, the width of adobe row is 50cm, it is 12 layers that the number of plies is piled up in adobe, the height of adobe row is 138cm, between the buttress between adjacent bricks hack, the outer arc width of ventilating duct is 65cm, and between the row between adjacent adobe row, the width of ventilating duct is 10cm.Between buttress, fire-resistant basketry is set in ventilating duct, only have two fire-resistant basketry is set in ventilating duct between adjacent three buttress, select particle size range to be the lime stone of 50 ~ 150mm, piled up by lime stone in the fire-resistant basketry that is arranged between buttress in ventilating duct, the weight ratio of gangue adobe and lime stone is 30:1.More than complete and pile up raw material stage.
The temperature of in arc kiln body each section is set: the temperature range of low temperature drying section is 30 ~ 35 DEG C, the temperature range of middle high temperature drying section is 100 ~ 120 DEG C, the temperature range of preheating section is 650 ~ 700 DEG C, the temperature range of furnace zone is 1000 ~ 1050 DEG C, the temperature range of soaking zone is 800 ~ 900 DEG C, the temperature of cooling section is lower than 700 DEG C.The intake controlling furnace zone is 40m
3/ min, capacity is 65m
3/ min.The temperature detecting arc kiln external body environment is 10 DEG C, and arc kiln body was moved forward the width of three adobe buttress every 3 hours along circular orbit.First Kazakhstan air lock system is lifted before movement, again Kazakhstan air lock system is fallen after mobile.In kiln, the desulfuration efficiency of desulfurization with roasting technique is up to 40%.
Lime stone after calcining is put in doctor solution regulating reservoir, the mass concentration scope of the lime stone in doctor solution regulating reservoir is 25%, use the base strength in NaOH regulating reservoir, the pH value range of doctor solution is adjusted to 5 ~ 8, being passed into by tail gas in kiln body in desulfurizing tower and spraying in desulfurizing tower by the doctor solution in doctor solution regulating reservoir, doctor solution Spraying rates is 2m
3/ min, the feed rate of tail gas is 65m
3/ min.Tail gas after wet process of FGD, desulfuration efficiency is up to 98%.
Embodiment 5
The coal gangue perforated brick adobe of preparation in embodiment 2 is piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace, the adobe of gangue standard brick at the bottom of ring kiln in along the layered stacked one-tenth adobe buttress of the diametric(al) of circular orbit, each adobe buttress comprises the three row's adobe rows paralleled, the width of adobe row is 45cm, it is 12 layers that the number of plies is piled up in adobe, the height of adobe row is 92cm, between the buttress between adjacent bricks hack, the outer arc width of ventilating duct is 45cm, and between the row between adjacent adobe row, the width of ventilating duct is 30cm.Adobe layer arranges fire-resistant basketry, selects particle size range to be the lime stone of 150 ~ 200mm, piled up by lime stone in the fire-resistant basketry that is arranged on adobe layer, the weight ratio of gangue adobe and lime stone is 10:1.More than complete and pile up raw material stage.
The temperature of in arc kiln body each section is set: the temperature range of low temperature drying section is 30 ~ 35 DEG C, the temperature range of middle high temperature drying section is 100 ~ 120 DEG C, the temperature range of preheating section is 650 ~ 700 DEG C, the temperature range of furnace zone is 1000 ~ 1050 DEG C, the temperature range of soaking zone is 800 ~ 900 DEG C, the temperature of cooling section is lower than 700 DEG C.The intake controlling furnace zone is 45m
3/ min, capacity is 67.5m
3/ min.The temperature detecting arc kiln external body environment is 25 DEG C, and arc kiln body was moved forward the width of three adobe buttress every 2.5 hours along circular orbit.First Kazakhstan air lock system is lifted before movement, again Kazakhstan air lock system is fallen after mobile.In kiln, the desulfuration efficiency of desulfurization with roasting technique is up to 60%.
Lime stone after calcining is put in doctor solution regulating reservoir, use the base strength in NaOH regulating reservoir, the mass concentration scope of the lime stone in doctor solution regulating reservoir is 10%, the pH value range of doctor solution is adjusted to 5 ~ 8, being passed into by tail gas in kiln body in desulfurizing tower and spraying in desulfurizing tower by the doctor solution in doctor solution regulating reservoir, doctor solution Spraying rates is 3m
3/ min, the feed rate of tail gas is 67.5m
3/ min.Tail gas after wet process of FGD, desulfuration efficiency is up to 99%.
Embodiment 6
The gangue hollow block adobe of preparation in embodiment 3 is piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace, along the layered stacked one-tenth adobe buttress of the diametric(al) of circular orbit at the bottom of ring kiln, each adobe buttress comprises the three row's adobe rows paralleled, the width of adobe row is 55cm, it is 12 layers that the number of plies is piled up in adobe, the height of adobe row is 138cm, between the buttress between adjacent bricks hack, the outer arc width of ventilating duct is 55cm, and between the row between adjacent adobe row, the width of ventilating duct is 20cm.Arrange fire-resistant basketry in ventilating duct between row, select particle size range to be the lime stone of 200 ~ 250mm, piled up by lime stone in the fire-resistant basketry between the row of being arranged in ventilating duct, the weight ratio of gangue adobe and lime stone is 20:1.More than complete and pile up raw material stage.
The temperature of in arc kiln body each section is set: the temperature range of low temperature drying section is 30 ~ 35 DEG C, the temperature range of middle high temperature drying section is 100 ~ 120 DEG C, the temperature range of preheating section is 650 ~ 700 DEG C, the temperature range of furnace zone is 1000 ~ 1050 DEG C, the temperature range of soaking zone is 800 ~ 900 DEG C, the temperature of cooling section is lower than 700 DEG C.The intake controlling furnace zone is 42.5m
3/ min, capacity is 70m
3/ min.The temperature detecting arc kiln external body environment is 35 DEG C, and arc kiln body was moved forward the width of three adobe buttress every 2 hours along circular orbit.First Kazakhstan air lock system is lifted before movement, again Kazakhstan air lock system is fallen after mobile.In kiln, the desulfuration efficiency of desulfurization with roasting technique is up to 55%.
Lime stone after calcining is put in doctor solution regulating reservoir, the mass concentration scope of the lime stone in doctor solution regulating reservoir is the base strength in 20% use NaOH regulating reservoir, the pH value range of doctor solution is adjusted to 5 ~ 8, being passed into by tail gas in kiln body in desulfurizing tower and spraying in desulfurizing tower by the doctor solution in doctor solution regulating reservoir, doctor solution Spraying rates is 2.5m
3/ min, the feed rate of tail gas is 70m
3/ min.Tail gas after wet process of FGD, desulfuration efficiency is up to 96%.
Embodiment 7
The gangue standard brick adobe of preparation in embodiment 1 is piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace, along the layered stacked one-tenth adobe buttress of the diametric(al) of circular orbit at the bottom of ring kiln, each adobe buttress comprises the three row's adobe rows paralleled, the width of adobe row is 50cm, it is 12 layers that the number of plies is piled up in adobe, the height of adobe row is 138cm, between the buttress between adjacent bricks hack, the outer arc width of ventilating duct is 65cm, and between the row between adjacent adobe row, the width of ventilating duct is 10cm.More than complete and pile up raw material stage.
The temperature of in arc kiln body each section is set: the temperature range of low temperature drying section is 30 ~ 35 DEG C, the temperature range of middle high temperature drying section is 100 ~ 120 DEG C, the temperature range of preheating section is 650 ~ 700 DEG C, the temperature range of furnace zone is 1000 ~ 1050 DEG C, the temperature range of soaking zone is 800 ~ 900 DEG C, the temperature of cooling section is lower than 700 DEG C.The intake controlling furnace zone is, 40m
3/ min, capacity is 65m
3/ min.The temperature detecting arc kiln external body environment is 10 DEG C, and arc kiln body was moved forward the width of three adobe buttress every 3 hours along circular orbit.First Kazakhstan air lock system is lifted before movement, again Kazakhstan air lock system is fallen after mobile.In kiln, the desulfuration efficiency of desulfurization with roasting technique is zero, can not carry out desulfurization in kiln to tail gas.
Lime stone is dropped in doctor solution regulating reservoir, use the base strength in NaOH regulating reservoir, the mass concentration scope of the lime stone in doctor solution regulating reservoir is 25%, the pH value range of doctor solution is adjusted to 5 ~ 8, being passed into by tail gas in kiln body in desulfurizing tower and spraying in desulfurizing tower by the doctor solution in doctor solution regulating reservoir, doctor solution Spraying rates is 2m
3/ min, the feed rate of tail gas is 65m
3/ min.Tail gas after wet process of FGD, desulfuration efficiency is only 80%.
Technical scheme of the present invention is not limited only to above-described embodiment, by reconfiguring and to above-described embodiment amendment in the reasonable scope, also belonging to protection scope of the present invention between above-described embodiment.
Claims (9)
1. mobile tunnel furnace fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: specifically comprise following processing step,
1), raw material is piled up: gangue adobe and lime stone are piled up at the bottom of the ring kiln between the circular orbit of mobile tunnel furnace;
2), desulfurization with roasting technique in kiln: according to certain heating schedule, roasting is carried out to the gangue adobe in arc kiln body and lime stone, by high-temperature roasting, carry out first time desulfurization;
3), wet process of FGD: the lime stone after calcining is put in doctor solution regulating reservoir and base strength in regulating reservoir, tail gas in kiln body to be passed in desulfurizing tower and the doctor solution in doctor solution regulating reservoir is sprayed in desulfurizing tower, by the chemical reaction occurred in desulfurizing tower, carry out second time desulfurization.
2. mobile tunnel furnace according to claim 1 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: the calorific value of the gangue adobe in described step 1) is 1200 ~ 1600kJ/kg, described gangue adobe at the bottom of ring kiln in along the layered stacked one-tenth adobe buttress of the diametric(al) of circular orbit, each adobe buttress comprises the three row adobe rows that parallel and arranges ventilating duct between fan-shaped buttress between adjacent bricks hack.
3. mobile tunnel furnace according to claim 2 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: the width of described adobe row is 45 ~ 55cm, arrange ventilating duct between the row that width is 10 ~ 30cm between adjacent adobe row, between described buttress, the outer arc width of ventilating duct is 45 ~ 65cm.
4. the mobile tunnel furnace according to any one of Claims 2 or 3 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: in described step 1), the weight ratio of gangue adobe and lime stone is 10:1 ~ 30:1, the particle size range of described lime stone is 50 ~ 250mm, and lime stone is piled up between adobe layer and/or to be piled up between row in ventilating duct and/or pile up ventilating duct between buttress.
5. mobile tunnel furnace according to claim 2 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: described step 2) in the arc kiln body middle high temperature drying section that to comprise temperature range be low temperature drying section, the temperature range of 30 ~ 35 DEG C is 100 ~ 120 DEG C, the temperature range preheating section that is 650 ~ 700 DEG C, temperature range to be furnace zone, the temperature range of 1000 ~ 1050 DEG C the be soaking zone of 800 ~ 900 DEG C and temperature lower than the cooling section of 700 DEG C.
6. mobile tunnel furnace according to claim 5 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: the section between the front end face of described arc kiln body, low temperature drying Duan Yuzhong high temperature drying section and the section between middle high temperature drying section and preheating section arrange Kazakhstan air lock system, described arc kiln body moved forward the width of three adobes buttress every 2 ~ 3 hours along circular orbit.
7. mobile tunnel furnace according to claim 5 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: the intake of described furnace zone is 40 ~ 45m
3/ min, capacity is 65 ~ 70m
3/ min.
8. mobile tunnel furnace according to claim 1 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: in described step 3), the mass percentage concentration of doctor solution regulating reservoir sodalime stone is 10% ~ 25%, the pH value of doctor solution is 5 ~ 8, and the conditioning agent of described base strength is NaOH.
9. mobile tunnel furnace according to claim 8 fires the high-efficiency purifying method of coal gangue baked brick emission, it is characterized in that: the doctor solution Spraying rates in described step 3) is 2 ~ 3m
3/ min, the feed rate of tail gas is 65 ~ 70m
3/ min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352966A (en) * | 2017-08-15 | 2017-11-17 | 三明市华宝新型建材有限公司 | A kind of colliery wastes brick and its production technology |
| CN109129869A (en) * | 2018-07-17 | 2019-01-04 | 乌海市黑白环保能源有限公司 | Hard plastic extrusion molding semi-stiff extrusion process system |
| CN113213500A (en) * | 2021-05-26 | 2021-08-06 | 赵生荣 | Energy-saving coal gangue flint clay based manufacturing method |
| CN113735562A (en) * | 2021-07-28 | 2021-12-03 | 彭阳县鑫卓能源科技发展有限公司 | Process method for circularly firing coal gangue green bricks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107352966A (en) * | 2017-08-15 | 2017-11-17 | 三明市华宝新型建材有限公司 | A kind of colliery wastes brick and its production technology |
| CN109129869A (en) * | 2018-07-17 | 2019-01-04 | 乌海市黑白环保能源有限公司 | Hard plastic extrusion molding semi-stiff extrusion process system |
| CN109129869B (en) * | 2018-07-17 | 2020-08-04 | 乌海市黑白环保能源有限公司 | One-time palletizing and burning system for hard plastic extrusion molding |
| CN113213500A (en) * | 2021-05-26 | 2021-08-06 | 赵生荣 | Energy-saving coal gangue flint clay based manufacturing method |
| CN113735562A (en) * | 2021-07-28 | 2021-12-03 | 彭阳县鑫卓能源科技发展有限公司 | Process method for circularly firing coal gangue green bricks |
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