CN102721049A - Plasma thermal cracking combustion apparatus of combination type pulverized coal furnace - Google Patents
Plasma thermal cracking combustion apparatus of combination type pulverized coal furnace Download PDFInfo
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- CN102721049A CN102721049A CN2012102377639A CN201210237763A CN102721049A CN 102721049 A CN102721049 A CN 102721049A CN 2012102377639 A CN2012102377639 A CN 2012102377639A CN 201210237763 A CN201210237763 A CN 201210237763A CN 102721049 A CN102721049 A CN 102721049A
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- pulverized coal
- coal
- plasma
- secondary air
- gate valve
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Abstract
The invention discloses a plasma thermal cracking combustion apparatus of a combination type pulverized coal furnace, which belongs to pulverized coal furnaces. A primary air pulverized coal feed pipe is communicated with a tee pulverized coal pipeline, two pulverized coal pipelines of the tee pulverized coal pipeline are respectively assembled with a main burning pulverized coal gate valve and a plasma ignition pulverized coal gate valve, the rear end part of the pulverized coal pipeline which is provided with the main burning pulverized coal gate valve is communicated and assembled with a small-diameter pulverized coal burner nozzle, the rear end part of the pulverized coal pipeline which is assembled with the plasma ignition pulverized coal gate valve is communicated and assembled with a pulverized coal rotational-flow volute, a pulverized coal mixer is respectively connected with the pulverized coal rotational-flow volute and a nonmetal thermal-cracking burner by virtue of a first connection flange and a second connection flange, an annular secondary air cylinder is sleeved on the outer part of the nonmetal thermal cracking burner, a secondary air swirler is installed on the inner side of the rear part of the annular secondary air cylinder, a secondary air blast pipe is communicated with the annular secondary air cylinder, and a plasma arc generator is installed on the pulverized coal mixer. The plasma thermal cracking combustion apparatus realizes the continuous operations of pulverized coal ignition, drying and normal combustion, has complete functions and strong adaptability, and is reasonable and simple in structure.
Description
Technical field
The invention belongs to the coal dust kiln, relates generally to a kind of nothing oil baker, igniting and normally device of operation of back of lighting a fire of plasma-arc gasification coal dust combined burning of coal dust rotary kiln.
Background technology
At present, igniting and bakers such as traditional fuel oil, combustion gas or timber are still continued to use in the baker of kiln, igniting, have wasted a large amount of high-quality energy.In recent years, begin to adopt directly excited gas powdered coal particle of plasma thermal cracking technology, the heat rotary kiln inwall that makes the generation of coal dust oxidizing fire reaches baker or ignition process requirement to requiring temperature.In this technology, pulverized coal particle must obtain enough heating-up temperatures and heat time heating time in the plasma thermal cracking; The effusion of fuel gas is just arranged, oxidation heat liberation then, the pulverized coal flow of equivalent flow velocity under big actual internal area can reduce; Can satisfy the requirement of plasma thermal cracking igniting, therefore, it is big that the diameter of coal dust kiln plasma thermal cracking burner is wanted; To guarantee the reduction of flow velocity; Burning behind igniting, the baking kiln needs circulation area to reduce, and to guarantee high coal dust flow velocity, satisfies the sufficiently long heating requirements of flame.But, in production practices, because of the defective on the structural design, existing coal dust kiln plasma thermal cracking equipment, still can not realize ideal with pulverized coal ignition, baker, the continuous institutional operation of burning.
Summary of the invention
The purpose of the invention is exactly the problem that exists to above-mentioned prior art; Design provides a kind of combined coal powder kiln plasma thermal cracking burner; Through adopting the combining structure of minor diameter spout and major diameter plasma thermal cracking burner, reach the initial stage igniting of coal dust kiln, baker, normal combustion and move the purpose of carrying out continuously.
The purpose of the invention is achieved in that a wind coal supply tube cell is communicated with the threeway pulverized coal channel; Equipped respectively main coal-fired powder gate valve and plasma ignition coal dust gate valve on two pulverized coal channels of threeway pulverized coal channel; The pulverized coal channel rearward end of equipped main coal-fired powder gate valve is communicated with equipped minor diameter coal burner spout; The pulverized coal channel rearward end of equipped plasma ignition coal dust gate valve is communicated with equipped coal powder cyclone volute; Through first adpting flange coal powder cyclone volute and coal, pulverulent fuel mixer front portion are connected, through second adpting flange coal, pulverulent fuel mixer rear portion and nonmetal thermal cracking burner front portion are connected, annular secondary wind jacket casing fits on the nonmetal thermal cracking combustor external; At annular secondary air duct posterior medial the secondary wind cyclone is installed; Secondary air intake pipe is communicated with annular secondary air duct, and the plasma-arc generator is installed on coal, pulverulent fuel mixer, so far constitutes combined coal powder kiln plasma thermal cracking burner.
The invention adopts the advantage of plasma thermal cracking non-oil ignition to be: high-quality fuel such as a, " replace oil with coal ", saving oil, natural gas; B, avoid, reduce the pollution that cold kiln fired state turning down kiln fuel oil, combustion gas baker, igniting produce; C, newly-built kiln can not built oil storage tank and sharing system, promptly reduce investment outlay and can eliminate the potential safety hazard that oil systems such as oil storage tank bring; D, the kiln that has been constructed and put into operation can be cancelled oil supply systems such as oil storage tank, eliminate the hidden danger of bringing thus; E, the insulation of having practiced thrift oil system, maintenance, maintenance cost; F, have the advantages that the igniting of coal dust initial stage, baker, normal combustion are carried out continuously, function is complete, and adaptability is strong, and is rational in infrastructure simple.
Description of drawings
Accompanying drawing is a combined coal powder kiln plasma thermal cracking burner general structure sketch map.
Piece number explanation among the figure:
1, wind coal supply tube cell, 2, threeway pulverized coal channel, 3, main coal-fired powder gate valve, 4, plasma ignition coal dust gate valve, 5, coal powder cyclone volute, 6, coal, pulverulent fuel mixer, 7, plasma-arc generator, 8, nonmetal thermal cracking burner, 9, secondary air intake pipe, 10, annular secondary air duct, 11, secondary cyclone, 12, minor diameter coal burner spout, 13, first adpting flange, 14, second adpting flange.
The specific embodiment
Below in conjunction with accompanying drawing the invention embodiment is described in detail.A kind of combined coal powder kiln plasma thermal cracking burner; One time wind coal supply tube cell 1 is communicated with threeway pulverized coal channel 2; Equipped respectively main coal-fired powder gate valve 3 and plasma ignition coal dust gate valve 4 on two pulverized coal channels of threeway pulverized coal channel 2; The pulverized coal channel rearward end of equipped main coal-fired powder gate valve 3 is communicated with equipped minor diameter coal burner spout 12; The pulverized coal channel rearward end of equipped plasma ignition coal dust gate valve 4 is communicated with equipped coal powder cyclone volute 5,, coal, pulverulent fuel mixer 6 rear portions and nonmetal thermal cracking burner 8 front portions is connected through second adpting flange 14 coal powder cyclone volute 5 and 6 anterior connections of coal, pulverulent fuel mixer through first adpting flange 13; Annular secondary air duct 10 covers fit on nonmetal thermal cracking burner 8 outsides; At annular secondary air duct 10 posterior medials secondary wind cyclone 11 is installed, secondary air intake pipe 9 is communicated with annular secondary air duct 10, and plasma-arc generator 7 is installed on coal, pulverulent fuel mixer 6.
During the igniting operation, in cold conditions igniting and baking kiln, start plasma-arc generator 7; In coal, pulverulent fuel mixer 6, form the plasma-arc zone, close main coal-fired powder gate valve 3, open plasma ignition coal dust gate valve 4; Wind and coal dust get in the plasma-arc conversion zone and nonmetal thermal cracking burner 8 that forms rotation status entering coal, pulverulent fuel mixer 6 in the coal powder cyclone spiral case 5 through a wind inlet; Coal dust passes through with helical trajectory in plasma-arc zone and nonmetal thermal cracking burner 8, the thermal cracking time of the coal dust that extended, has increased the effusion of coal dust fuel gas; Improved the burn-off rate of coal dust; It is following with the result to produce the plasma thermal cracking process: plasma-arc and heat cracking reaction chamber coal dust excite, hot tearing, catalysis, make it to isolate the solid phase fugitive constituent, fuel gas effusion (2C+O
2=2CO) → part fuel gas oxidation reaction heat release → CO+O
2=CO
2+ O; CO+O+M=CO
2Anxious gas-solid mixed flow (fuel gas is greater than 30%+ coal dust carbon the stamen) → gas-solid mixed flow that gathers heating other coal dust → reaction of high order → the enterings burner nozzle that raises of+M → temperature sprays into that kiln is interior to mix with secondary wind → do not need that just light a fire once more can smooth combustion, reaches the abundant burning of coal dust under the black furnace state.Plasma torch and " cold conditions gas powder " (T
a=5-20 ℃) interact that to make quality be that 100 little milligrams coal particle receives the particle that splits into little milligram of several 5-10 after the thermal shock.The fugitive constituent of coal (CO, CO
2, CH
4, C
6H
6, N
2And H
2O) just from these original particles, overflow, in the fugitive constituent oxidation reaction, the required activation energy consumption of the oxidation of oxygen atom mould is low; Oxidation reaction speed is fast; This is the property that a large amount of oxygen atom moulds of plasma-arc heat shock generation are had, and the result is that the temperature rising is accelerated, and has reduced the igniting power consumption.
It in the table oxygen atom mould and oxygen molecule required priming reaction energy in oxidation.Molecular reaction and atomic reaction power consumption compare:
CO+O
2＝CO
2+O E
a?37.6(2.1)
CO+O+M＝CO
2+M E
a＝4.1(2.2)
CH
3+O
2＝CH
3O+O E
a＝29?(2.3)
CH
3+O＝CH
2O+H E
a＝2 (2.4)
C
2H
2+O
2＝HCO+HCO E
a＝28?(2.5)
C
2H
2+O＝CH
2+CO E
a＝4 (2.6)
CO
2+O
2＝CO+O+O
2 E
a＝120(2.7)
CO
2+O＝CO+O
2 E
a33 (2.8)
Here: E
a-priming reaction energy; Kilocalorie/gram molecule; M one neutral molecule.Can find out relatively that from above-mentioned reflection the needed activation energy of elemental oxygen reduces 3-13.5 doubly than molecular oxygen, monatomic O reaction is than molecule O
2Want fast a lot, constantly quicken the fugitive constituent oxidation reaction, constantly accelerate thermal decomposition, the result will strengthen residue charcoal stamen and heat, and accelerate solid carbon and transform to gasification.
The secondary wind of secondary air intake pipe 9 sprays into a wind oxygen supply in the kiln through the secondary wind that secondary wind cyclone 11 forms rotation to nonmetal thermal cracking burner 8; Simultaneously; The diameter of flame spreading improves the heats to kiln hood; The heat form that diameter is big, flame is short has been accelerated the rapid raising of temperature of kiln head, for necessary condition has been set up in the operation of normal input coal dust.When temperature of kiln head reaches 900 degree when above; Open main coal-fired powder gate valve 3; Close plasma ignition coal dust gate valve 4, at this moment, coal dust all sprays into kiln combustion chamber with the speed that is higher than plasma pulverized coal ignition burner through same wind powder amount in minor diameter coal burner spout 12; The result that the minor diameter pulverized coal flow sprays into has at a high speed formed elongated flame profile, has satisfied the heating condition to the kiln degree of depth.
Claims (1)
1. combined coal powder kiln plasma thermal cracking burner; It is characterized in that a wind coal supply tube cell (1) is communicated with threeway pulverized coal channel (2); Equipped respectively main coal-fired powder gate valve (3) and plasma ignition coal dust gate valve (4) on two pulverized coal channels of threeway pulverized coal channel (2); The pulverized coal channel rearward end of equipped main coal-fired powder gate valve (3) is communicated with equipped minor diameter coal burner spout (12); The pulverized coal channel rearward end of equipped plasma ignition coal dust gate valve (4) is communicated with equipped coal powder cyclone volute (5); Through first adpting flange (13) coal powder cyclone volute (5) and coal, pulverulent fuel mixer (6) front portion are connected; Through second adpting flange (14) coal, pulverulent fuel mixer (6) rear portion and nonmetal thermal cracking burner (8) front portion are connected, annular secondary air duct (10) cover fits on nonmetal thermal cracking burner (8) outside, at annular secondary air duct (10) posterior medial secondary wind cyclone (11) is installed; Secondary air intake pipe (9) is communicated with annular secondary air duct (10), goes up at coal, pulverulent fuel mixer (6) plasma-arc generator (7) is installed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102377639A CN102721049A (en) | 2012-07-11 | 2012-07-11 | Plasma thermal cracking combustion apparatus of combination type pulverized coal furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102377639A CN102721049A (en) | 2012-07-11 | 2012-07-11 | Plasma thermal cracking combustion apparatus of combination type pulverized coal furnace |
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| CN102721049A true CN102721049A (en) | 2012-10-10 |
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ID=46946881
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102377639A Pending CN102721049A (en) | 2012-07-11 | 2012-07-11 | Plasma thermal cracking combustion apparatus of combination type pulverized coal furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090380A (en) * | 2013-01-09 | 2013-05-08 | 向卫 | Plasma oilless oxygen enrichment pulverized coal combustion device |
| CN105066123A (en) * | 2015-08-17 | 2015-11-18 | 南京君铎环保科技有限公司 | Plasma ignition composite multi-channel combustion device for rotary kiln |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ11097U1 (en) * | 2001-01-26 | 2001-04-18 | Orgrez | Powder burner and plasma torch for it |
| CN2605476Y (en) * | 2003-03-11 | 2004-03-03 | 陈昌俊 | Three-vortex muffle burner |
| CN201062792Y (en) * | 2007-07-06 | 2008-05-21 | 烟台龙源电力技术股份有限公司 | Oil-coal dust combustion apparatus for cement kiln furnace |
| CN101900331A (en) * | 2010-07-28 | 2010-12-01 | 南京创能电力科技开发有限公司 | Low-temperature plasma rotational flow coal dust start-up burner |
| CN202647745U (en) * | 2012-07-11 | 2013-01-02 | 曲大伟 | Plasma heat cracking burning device for combined coal powder kiln |
-
2012
- 2012-07-11 CN CN2012102377639A patent/CN102721049A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ11097U1 (en) * | 2001-01-26 | 2001-04-18 | Orgrez | Powder burner and plasma torch for it |
| CN2605476Y (en) * | 2003-03-11 | 2004-03-03 | 陈昌俊 | Three-vortex muffle burner |
| CN201062792Y (en) * | 2007-07-06 | 2008-05-21 | 烟台龙源电力技术股份有限公司 | Oil-coal dust combustion apparatus for cement kiln furnace |
| CN101900331A (en) * | 2010-07-28 | 2010-12-01 | 南京创能电力科技开发有限公司 | Low-temperature plasma rotational flow coal dust start-up burner |
| CN202647745U (en) * | 2012-07-11 | 2013-01-02 | 曲大伟 | Plasma heat cracking burning device for combined coal powder kiln |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090380A (en) * | 2013-01-09 | 2013-05-08 | 向卫 | Plasma oilless oxygen enrichment pulverized coal combustion device |
| CN105066123A (en) * | 2015-08-17 | 2015-11-18 | 南京君铎环保科技有限公司 | Plasma ignition composite multi-channel combustion device for rotary kiln |
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Application publication date: 20121010 |