CN101367536A - Method and decomposition stove for preparing lime in suspended state with wood coal as fuel - Google Patents
Method and decomposition stove for preparing lime in suspended state with wood coal as fuel Download PDFInfo
- Publication number
- CN101367536A CN101367536A CNA2007100661201A CN200710066120A CN101367536A CN 101367536 A CN101367536 A CN 101367536A CN A2007100661201 A CNA2007100661201 A CN A2007100661201A CN 200710066120 A CN200710066120 A CN 200710066120A CN 101367536 A CN101367536 A CN 101367536A
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- Prior art keywords
- lime
- powder
- coal
- decomposition furnace
- lignite
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 31
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 31
- 239000004571 lime Substances 0.000 title claims abstract description 31
- 239000003245 coal Substances 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 7
- 238000000354 decomposition reaction Methods 0.000 title abstract description 15
- 239000000446 fuel Substances 0.000 title description 11
- 239000002023 wood Substances 0.000 title 1
- 239000000843 powder Substances 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000003077 lignite Substances 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 10
- 235000019738 Limestone Nutrition 0.000 claims abstract description 9
- 239000006028 limestone Substances 0.000 claims abstract description 9
- 239000002817 coal dust Substances 0.000 claims description 13
- 235000012204 lemonade/lime carbonate Nutrition 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000005507 spraying Methods 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 2
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002802 bituminous coal Substances 0.000 description 3
- 239000012716 precipitator Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005373 Panax quinquefolius Species 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
The invention relates to a method for producing lime that lignite powder is mixed with limestone powder that is heated by a suspension pre-heating system to be burned in a reversed U-shaped decomposition furnace, and calcium carbonate is decomposed inside the decomposition furnace, and the lime is cooled by a suspension cooling system. 70 percent of the lignite powder is sprayed into a decomposition furnace cylinder 15 through the head part of the decomposition furnace; after being heated by the suspension pre-heating system 1-11, the limestone powder is fed into the decomposition furnace from a feeding pipe 12. 30 percent of the lignite powder is sprayed into the decomposition furnace cylinder 19 from the mid-part lignite-spraying pipe 18, so as to maintain the temperature at 900 DEG C. After the lime is cooled by the suspension cooling system 22-33, the lime is collected by a whirlwind dust collector 33, and enters into a lime bin 35. The reversed U-shaped decomposition furnace is mainly composed of a feeding pipe 12, a head-part lignite-spraying pie 13, an inlet-end cylinder 15, a reversed U-shaped connection pipe 16, a mid-part lignite-spraying pipe 18 and an outlet-end cylinder 19. The diameter of the cylinder 19 is larger than that of the cylinder 15, so as to prolong the remaining time of the material and to reduce the resistant force of the system.
Description
Technical field:
The present invention be a kind of be fuel with brown coal, limestone powder heats in suspension preheating; Coal dust mixes afterfire with limestone powder in decomposing furnace; The method of the production lime of lime in the suspension cooling system.Lime carbonate decomposes about 900 ℃, and the lime that is generated has the short texture porous, and is active good, helps reacting with other materials; The NOX amount that forms is few.Wherein, about 70% brown coal powder sprays into from the decomposing furnace head, and 30% coal dust sprays into from the decomposing furnace middle part, to keep calciner temperature uniform and stable.The diameter of decomposing furnace exit end cylinder is bigger than entrance end, in the time of can prolonging material and stop and reduce systemic resistance.
Background technology:
The method of producing at present lime is that block Wingdale is deposited in the earth kiln, at high temperature is sintered into flame-out cooling behind the lime, takes out then.Belong to discontinuous production.Its shortcoming has: 1. production automation degree is low, and production efficiency is low, and production concentration degree is disperseed.2. Wingdale heats under bulk and decomposes, conduct heat and mass transfer velocity slow, heating and resolving time are long, production requirement temperature height, soaking time are long, efficiency of utilization is low, the hear rate height; The S0 2 that generates is big with the NOX amount, and environmental pollution is serious; 3. require production temperature height, be unfavorable for that calorific values such as brown coal are low, the fuel utilization that temperature of combustion is low.4. non-complete combustion of fuel is serious, and the CO amount of formation is many, and waste of fuel is big.5. generate the temperature height, structure is tight, poor activity, and the quality instability, slag ratio is more during use, and waste is serious, is unfavorable for the utilization in industry;
According to the characteristics that material conducts heat under suspended state, mass transfer velocity is fast, efficient is high, the present invention all carries out the burning of coal dust, the heating of limestone powder, the decomposition of lime carbonate and the cooling of lime under suspended state.In order to reduce spent air temperture, improve system thermal efficiency, device is received by star-like feeder, five-stage whirlwind by the suspension preheating system and increase in pipeline is formed.Decompose fast 900 ℃ the time according to lime carbonate, decompose the lime that is generated below 900 ℃ and have the short texture porous, active good, help the principle that reacts with other materials.The present invention is controlled at the decomposition temperature of lime carbonate about 900 ℃.The gas temperature that enters decomposing furnace from the whirlwind cooling system is lower than 870 ℃ at the point of ignition of bituminous coal about 650 ℃, be unfavorable for that bituminous coal combustion is complete.Brown coal temperature of combustion under suspended state is higher than 900 ℃, can satisfy production requirement, and the brown coal price is lower than bituminous coal price, and point of ignition is also low, and the present invention uses brown coal to be fuel.Because brown coal burn under suspended state rapidly, guarantee that lime carbonate decomposes fully, if localized hyperthermia will appear in disposable adding coal dust, burn out equipment on the one hand easily, can form a large amount of NOX on the other hand, for the production temperature is controlled at about 900 ℃, guarantee that again lime carbonate decomposes fully, the present invention is divided into two portions with coal dust, spraying into about 70% from the decomposing furnace head, about 30% spray into from decomposing furnace middle part.Rate of decomposition requires high more, requires the resolving time long more.In order to prolong the residence time of material in decomposing furnace, improve lime carbonate decomposition rate, and reduce system height, decomposition furnace structure of the present invention is made as inverted u-shaped.It mainly is made up of feed end cylinder, inverted u-shaped connecting tube and discharge end cylinder.In order to increase vortex effect, prolong the residence time of material in decomposing furnace, the entrance end cylinder takes the plane to be connected with the inverted u-shaped pipe connecting among the present invention.Because of exit end gas-entrained material moves from top to bottom, the newel post's body of expanding export can reduce gas flow rate, prolongs residence time of material, improves the rate of decomposition of lime carbonate.The present invention has enlarged the exit end column diameter.For fear of buildup and reduction system height, decomposing furnace outlet position is a cone among the present invention, and directly is connected with cyclone by passage.In order to reduce system height and to reduce number of devices, third stage cyclone of the present invention is the horizontal cyclone dust-precipitator, and is located at ground; Fourth stage cooling cyclone is located at the lime bin top, and the lime that takes down directly enters lime bin.In order to improve the separation efficiency of finished product and gas, to improve system thermal efficiency, fourth stage cyclone is four cyclones.In order to improve gas and solid mixed effect, improve heat transfer efficiency, the present invention is equipped with the spreading case at each grade feed opening place.In order to improve gas solid separation efficient, improve thermo-efficiency, the present invention is provided with air valve on every grade of tremie pipe.
Summary of the invention:
In order to improve production automation degree, enhance productivity and production concentration degree, improve efficiency of utilization, reduce hear rate; Reduce the production temperature, reduce the growing amount of NOX and SO2, reduce environmental pollution; It is low to make full use of calorific values such as brown coal, the fuel that temperature of combustion is low.The invention provides a kind of is fuel with brown coal, and about 70% coal dust sprays into from the decomposing furnace head; Limestone powder enters decomposing furnace after heating through the suspension preheating system; 30% coal dust sprays into from the decomposing furnace middle part, to keep calciner temperature uniform and stable, improves lime carbonate decomposition rate; Lime is taken down by cyclone after the cooling of suspension cooling system, directly enters the method for the production lime of lime bin.In order to guarantee the realization of above production method, the invention provides the inverted u-shaped decomposing furnace that a kind of coal supply powder burning and lime carbonate decompose.It is made up of increase in pipeline, inlet cone, tremie pipe, head coal dust jet pipe, feed end cylinder, inverted u-shaped connecting tube, middle part cone, middle part coal powder injection pipe, exit end cylinder, outlet cone and tapping channel.
Description of drawings:
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is a system of the present invention vertical planning drawing.
Fig. 2 is the vertical planning drawing of decomposing furnace among the present invention.
Fig. 3 is the vertical view of decomposing furnace among the present invention.
Among the figure, 1. star-like feeder; 2. spreading case, 3.C2 to C1 increase in pipeline; 4. cyclone C1; 5. air valve; 6.C3 to the C2 increase in pipeline; 7. cyclone C2; 8.C4 to the C3 increase in pipeline; 9. cyclone C3; 10.C5 to the C4 increase in pipeline; 11. cyclone C4; 12. tremie pipe; 13. head coal dust jet pipe, 14. entrance end cones; 15. entrance end cylinder; 16. inverted u-shaped connecting tube; 17. middle part cone; 18. middle part coal powder injection pipe; 19. exit end cylinder; 20. outlet cone; 21. tapping channel; 22. cyclone C5; 23.L C2 to LC1 increase in pipeline; 24. cyclone LC1; 25.LC1 to the decomposing furnace increase in pipeline; 26. high-temperature blower is to the LC2 increase in pipeline; 27. cyclone LC2; 28.LC4 to LC3 decline pipeline; 29. horizontal cyclone dust-precipitator LC3; 30. high-temperature blower; 31. air valve; 32. the cold wind mouth is to the LC4 increase in pipeline; 33. the vertical cyclone LC4 of four pipes; 34. star-like blanking device; 35. lime stockyard; 36.C1 pipeline to cogeneration heating system and flare system.
Embodiment:
Limestone powder enters cyclone 4 by star-like feeder 1 feeding C2 to C1 increase in pipeline 3 after the hot blast from level cyclone 7 mixes; After the gas solid separation, gas is delivered to by pipeline 36 after the cogeneration heating system, and a part enters atmosphere after flare system is handled; Another part process brown coal oven dry grinding system enters atmosphere after gathering dust and handling.Solid enters C3 to C2 increase in pipeline 6, afterwards successively through cyclone 7, and C4 to C3 increase in pipeline 8, cyclone 9, C5 to C4 increase in pipeline 10, cyclone 11 is heated to about 700 ℃.Afterwards, by tremie pipe 12 feeding decomposing furnaces; Coal dust about 70% sprays into newel post's body 15 by powder jet pipe 13; High-temperature gas after the cool lime sprays into cone 14 from pipeline 25, produces the effect of spurting.Mixture, sprays in about 30% the coal dust coal powder injection pipe 18, to keep calciner temperature uniform and stable when cone 17 enters cylinder 19 through inverted u-shaped connecting tube 16.Lime carbonate enters cyclone 22 through passage 21 after decomposing fully in cylinder 19.Afterwards, be promoted to the vertical cyclone 33 of four pipes through pipeline 23, cyclone 24, pipeline 26, cyclone 27, LC4 to LC3 decline pipeline 28, horizontal cyclone dust-precipitator 29, cold wind mouth to LC4 increase in pipeline 32 successively, separated from the gas after star-like blanking device 34 feeding lime stockyards 35.
Beneficial effect of the present invention has:
1. utilize ignition temperature and the low fuel production material of calorific value such as brown coal;
2. level of automation height, the production efficiency height is convenient to expand the scale of production;
3. production temperature has reduced the growing amount of NOX about 900 ℃, reduced the pollution to environment;
4. the lime of Sheng Chenging is pulverulence, has the adsorptive power of stronger SO2, helps reducing the emission concentration of SO2, has reduced the pollution to environment;
4. fuel burns under suspended state and conducts heat, and sufficient combustion conducts heat rapidly, and the CO of generation and SO2 amount are few, the thermo-efficiency height, and coal consumption is low;
5. lime cools off under suspended state, and the waste heat recovery amount is big;
6. fourth stage cooling cyclone is located at the lime bin top, and the product lime that takes down directly enters lime bin, and equipment is few, the operation factor height;
7. heating, decompose and cooling all moves under negative pressure, no dust discharge pollutes for a short time, and production loss is few;
8. the pure low-temperature cogeneration heating system can be installed, to reduce power consumption.
Claims (2)
1. an a part of brown coal powder sprays into from inverted u-shaped decomposing furnace head, and the high-temperature gas mixing afterfire with being heated to the limestone powder about 650 ℃ and the cooling system that suspends through the suspended preheater system is decomposed lime carbonate about 900 ℃; Part brown coal powder sprays into from the decomposing furnace middle part, to keep calciner temperature uniform and stable; Lime is collected by cyclone after cooling off through the suspension cooling system, directly enters the method for the production lime of lime bin.
2. one kind by two cylinders of inverted u-shaped pipe connection, and a part of coal dust sprays into the entrance end cylinder by head coal powder injection pipe; Limestone powder feeds from the head; Part coal dust sprays into the exit end cylinder by middle part coal powder injection pipe, the decomposing furnace that the burning of coal supply powder and lime carbonate decompose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100661201A CN101367536A (en) | 2007-08-17 | 2007-08-17 | Method and decomposition stove for preparing lime in suspended state with wood coal as fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100661201A CN101367536A (en) | 2007-08-17 | 2007-08-17 | Method and decomposition stove for preparing lime in suspended state with wood coal as fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101367536A true CN101367536A (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100661201A Pending CN101367536A (en) | 2007-08-17 | 2007-08-17 | Method and decomposition stove for preparing lime in suspended state with wood coal as fuel |
Country Status (1)
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| CN (1) | CN101367536A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101987783A (en) * | 2010-08-27 | 2011-03-23 | 莱芜钢铁股份有限公司 | Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace |
| CN103102057A (en) * | 2013-02-07 | 2013-05-15 | 燕山大学 | Preparation method of self-bonding and pre-decomposing glass batch |
| CN107032377A (en) * | 2017-05-11 | 2017-08-11 | 烟台大学 | A kind of aluminum oxide defluorinating agent and its production and use |
| CN109877144A (en) * | 2019-04-16 | 2019-06-14 | 四川海沛环保科技有限公司 | The cement calcination raw material and its preparation process of a kind of alternative traditional quick lime and application |
-
2007
- 2007-08-17 CN CNA2007100661201A patent/CN101367536A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101987783A (en) * | 2010-08-27 | 2011-03-23 | 莱芜钢铁股份有限公司 | Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace |
| CN101987783B (en) * | 2010-08-27 | 2012-08-22 | 山东钢铁股份有限公司 | Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace |
| CN103102057A (en) * | 2013-02-07 | 2013-05-15 | 燕山大学 | Preparation method of self-bonding and pre-decomposing glass batch |
| CN103102057B (en) * | 2013-02-07 | 2015-07-29 | 燕山大学 | The preparation method of the glass batch of self-adhesive and predecomposition |
| CN107032377A (en) * | 2017-05-11 | 2017-08-11 | 烟台大学 | A kind of aluminum oxide defluorinating agent and its production and use |
| CN109877144A (en) * | 2019-04-16 | 2019-06-14 | 四川海沛环保科技有限公司 | The cement calcination raw material and its preparation process of a kind of alternative traditional quick lime and application |
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Open date: 20090218 |