CN102434890A - Method for providing oxygen enrichment gas for rotary cement kiln multichannel burner oxygen enrichment combustion supporting - Google Patents
Method for providing oxygen enrichment gas for rotary cement kiln multichannel burner oxygen enrichment combustion supporting Download PDFInfo
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- CN102434890A CN102434890A CN2011103480172A CN201110348017A CN102434890A CN 102434890 A CN102434890 A CN 102434890A CN 2011103480172 A CN2011103480172 A CN 2011103480172A CN 201110348017 A CN201110348017 A CN 201110348017A CN 102434890 A CN102434890 A CN 102434890A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to the technical field of thermal power engineering, which particularly relates to a method for providing oxygen enrichment gas for rotary cement kiln multichannel burner oxygen enrichment combustion supporting. According to the structure and burning characteristics of a multichannel burner of a rotary cement kiln, membrane separation technology is first adopted, two kinds of oxygen enrichment gas with different purity are separated and obtained from air, and then the two kinds of oxygen enrichment gas with the different purity are respectively sent to different portions of the multichannel burner of the rotary cement kiln to conduct oxygen enrichment combustion-supporting. The membrane separation technology adopts two stage separation steps of a two-stage membrane separation device, the oxygen enrichment gas with higher purity is output from permeating gas outlet of a second-stage membrane separator and sent to a center tuyere of the multichannel burner, and the oxygen enrichment gas with lower purity is output from a retention gas outlet and sent to an axial flow air inlet of the multichannel burner. The thermostability structure of the existing burner and the rotary kiln do not need to change, regulatory of oxygen enrichment combustion can be strengthened, and effects of the oxygen enrichment combustion are obviously improved. Compared with the prior art, the method can achieve 20%-80% energy conservation benefits.
Description
Technical field
The invention belongs to the Thermal Power Engineering technical field, be specifically related to a kind of membrane oxygen enrichment technology that adopts and be directed against the method that cement rotary kiln carries out oxygen-enriched combustion-supporting.
Background technology
Membrane oxygen enrichment technology is a kind of new separation method that grows up gradually from the end of the seventies.It utilizes the selection permeability difference of organic polymer dense film to nitrogen, oxygen; When having pressure differential or pressure ratio in the film both sides; Fast gas of infiltration rate such as water vapour, hydrogen, helium, oxygen, carbon dioxide etc. see through behind the film low-pressure side enrichment at film in the raw air becomes oxygen-enriched air (the oxygen nitrogen separation of looking membrane material is different; Single-stage is separated can obtain the oxygen enrichment that purity is about 23-60%), and slow relatively gas such as nitrogen, argon gas, methane and the carbon monoxide etc. of infiltration rate are oxygen deprivation (or rich nitrogen) air in the delay side of film by enrichment.Membrane separating method is that a new way has been opened up in the oxygen enrichment extraction; In separating the overall process that concentrates, there is not phase transformation; Normal temperature separates; Especially the negative pressure flow process piece-rate system that makes up with board-like film has that equipment is simple, low cost of manufacture, energy resource consumption are little, output scalable, start rapid, easy and simple to handle, the static operation of system, the high outstanding advantage of reliability.At present; Adopt membrane separating method to produce oxygen enrichment and be widely used in fields such as oxygen-enriched combustion-supporting, oxygen enrichment ventilation, water treatment; Especially be directed against the oxygen-enriched combustion-supporting of glass, metallurgy, cement rotary kiln, Industrial Boiler or the like Thermal Power Engineering Field; Because of the series of advantages that membrane separating method has, can be each energy unit a kind of relatively inexpensive, on-the-spot air supply method and extensively being adopted flexibly is provided.
It is unquestionable that oxygen-enriched combustion-supporting can improve the burning of coal process to a certain extent; Up to now; Be that cement rotary kiln carries out in the technology of oxygen-enriched combustion-supporting with the membrane oxygen enrichment technology; Usually earlier after directly in air, obtaining purity (concentration of volume percent) and be the oxygen rich gas of 28%-40% with membrane separating method, oxygen rich gas is all replaced or part replaces combustion air, perhaps with oxygen enrichment and the oxygen enrichment that forms low-purity more after air mixes all replacements perhaps partly replace combustion air.In this course; Oxygen enrichment is sent into such as the one or more passages in the multi-channel coal powder combustor with a kind of purity (percent by volume) usually carries out oxygen-enriched combustion-supporting; The adjusting of sending into behind the burner because of the oxygen enrichment of single purity receives restriction to a certain degree; And then the modulability that causes carrying out oxygen-enriched combusting is restricted; Especially in the burning clinker of cement process that adopts the low-grade fuel coal to carry out, the oxygen-enriched combustion-supporting that the oxygen enrichment of single purity entering burner carries out will influence the oxygen-enriched combustion-supporting effect because the modulability of combustion system is not good enough.
Coal burner, especially multi-channel coal powder combustor are visual plants of clinker firing system, adjusting function direct relation clinker output, quality and the hear rate of burner, even influence problems such as environmental protection.The modulability of burner also concerns the energy-saving potential of the operational stability and the system of system; During fuel combustion; The air main source that supplies burning usefulness is air and auxiliary air once: the primary air of the lower temperature that in kiln, sprays through burner, come from the cooling machine with the grog heat exchange after the high temperature secondary air.In combustion process, should reduce the primary air amount as far as possible, the ratio reduction of primary air amount means that then auxiliary air amount ratio increases; Through estimation, when secondary air temperature was 900 ℃, the primary air flow of every reduction by 1%, the oxidant that the auxiliary air of using is brought into because of high temperature air more carry out high-temperature air combustion promoter can make the fuel hear rate fall 13.5KJ/kg.Early stage triple channel burner primary air amount is more than 12%-15%, and the primary air amount of the four-way burner after optimizing can be reduced to below 7% at present, thereby has saved energy greatly.Rotary kiln burner develops into today, existing 4 generation product:
(1) single channel burner.Wind consumption of single channel burner is big, and the flame adjustable range is narrow, and flexibility is little, to different ature of coal bad adaptability.Be applicable to long rotary kiln, except that wet-process rotary kiln, also can be applicable to the production of dry method kiln.
(2) triple channel burner.Early 1980s, along with exploitation, the rotary kiln of preheater and decomposition furnace system shortens, the triple channel burner is developed, and it has saved the primary air amount, can obtain during combusting coal fines short, disperse, the flame of strong eddy current form.
(3) third generation burner.The flame of the third generation burner of late 1990s exploitation is elongated, but more concentrated.Advantage is that flame temperature is high, and the speed at burner outlet place is high, has reduced the primary air amount.
(4) four-way burner.The four-way burner is a combustion apparatus of new generation, is specifically designed to rotary kiln.Its design can use the base portion of full flame to form the circulation eddy current, when cold kiln is lighted a fire, produces the desirable retention flame.More energy-conservation (through reducing the primary air amount significantly) and minimizing environmental pollution (through reducing the NOx discharge capacity)
At present, coal-fired cement rotary kiln extensively adopts multicenter combustor, and triple channel, four-way burner are typically arranged.Combining to carry out in the process of oxygen-enriched combusting with film oxygen enriching technology; Send into the oxygen enrichment of different purity at different passages; Can further reduce the primary air amount of lower temperature, the modulability that strengthens oxygen-enriched combusting, reinforcement oxygen-enriched combustion-supporting effect; And then obtain considerable energy-saving benefit, especially along with the research and development of separation membrane and the breakthrough of flow process, membrane oxygen enrichment technology combines with combustion-supporting technology and can realize many purity oxygen-enriched combustion-supporting simply, cheaply; In a sense, expanded the combustion-supporting application of film oxygen enriching because of the change of combustion-supporting supply method with oxidant.
Summary of the invention
The objective of the invention is to propose that a kind of combustion-supporting efficient is high, the burning cost is low based on membrane separation technique the method for oxygen rich gas (oxidant) is provided for cement rotary kiln multicenter combustor oxygen-enriched combustion-supporting.
Basic skills of the present invention is; According to the structure and the burning feature of the multicenter combustor of cement rotary kiln, adopt membrane separation technique, in air, separate the oxygen rich gas that obtains two kinds of different purity; Send into the different parts of the multicenter combustor of cement rotary kiln respectively; Carry out oxygen-enriched combustion-supporting,, reduce the burning cost to improve efficiency of combustion.
Based on above-mentioned basic skills, the present invention proposes a kind of device that oxygen rich gas (oxidant) is provided for cement rotary kiln multicenter combustor oxygen-enriched combustion-supporting.This device comprises, two-stage membrane separator, an air cleaner AF01,3 boost device A B01, AB02, AB03; Wherein, in the two-stage membrane separator, each membrane separator has 1 unstripped gas inlet A0 at least; 1 remained gas outlet A1,1 infiltration gas outlet A2, the separation membrane in each membrane separator (diffusion barrier) is divided into both sides at least; One side is the malleation side, and a side is a suction side, and the malleation side also is the unstripped gas side of membrane separator; Be also referred to as high-pressure side, remained gas side, suction side also is the infiltrating gas side of membrane separator, is also referred to as low-pressure side; Air cleaner AF01 is connected by pipeline and the first device A B01 that boosts, and the first device A B01 that boosts is connected by the unstripped gas inlet A0 of pipeline and first order membrane separator M01; The infiltration gas of first order membrane separator M01 outlet A2 is connected by pipeline and the second device A B02 that boosts; The second device A B02 that boosts is connected by the unstripped gas inlet A0 of pipeline and second level membrane separator M02, and the infiltration gas of second level membrane separator M02 exports A2 and is connected by pipeline and the 3rd device A B03 that boosts; The 3rd device A B03 that boosts is connected by the center wind inlet of pipeline and cement rotary kiln multicenter combustor, and the oxygen rich gas of higher degree is sent into multicenter combustor; The remained gas outlet A1 of second level membrane separator M02 is connected with the axial flow wind inlet of cement rotary kiln multicenter combustor by pipeline, will send into multicenter combustor than the oxygen rich gas of low-purity.
Said air cleaner AF01 can be various forms of filters, like the filter of self-cleaning, is used to remove impurity such as airborne dust.
The said first device A B01 that boosts can be an air blast, mainly in order to overcome AF01 and to the resistance between the membrane separator M01 remained gas outlet A1.
The said second device A B02 that boosts can be the equipment that boost such as vavuum pump; Main in order to set up the 1st grade of required pressure ratio of film separation process; And overcome and be exported to the resistance of second membrane separator M02 remained gas outlet A1 between kiln burning device inlet, even comprise and overcome the required blast of kiln burning device; Certainly, this also can boost equipment in order to overcoming along journey transporting resistance and the required blast of kiln burning device from the second device A B02 outlet back serial connection of boosting, and the second device A B02 that boosts then only is used to set up the required pressure ratio of film separation process.
The said the 3rd device A B03 that boosts also can be the equipment that boost such as vavuum pump, mainly in order to setting up the required pressure ratio of second level film separation process, and overcomes the resistance that is exported between the kiln burning device inlet, even comprises and overcome the required blast of kiln burning device; Certainly, also can boost to be connected in series after device A B03 exports from the 3rd and boost equipment in order to overcome along journey transporting resistance and the required blast of kiln burning device, AB03 then only be used to set up the required pressure ratio of film separation process.
Among the present invention, said first order membrane separator M01 and second level membrane separator M02 can be composed in series by a plurality of membrane separators, specifically can confirm according to actual needs.The diffusion barrier of said membrane separator can adopt rolled film or board-like film.
The method of oxidant (oxygen rich gas) that provides of the present invention is different from prior art; Prior art is to be the oxygen enrichment that multicenter combustor provides different purity with respectively independently film separation process or other technological separation process (like transformation absorption, empty the branchs technology of deep cooling), and the present invention then is that the coupling technique that adopted film to separate carries out the oxygen enrichment extraction and is delivered to the method for stove.At first; Selected first order membrane separator to obtain the low-purity oxygen enrichment but directly this oxygen enrichment has not been sent into stove in the per-meate side of film; And order is provided with back level (second level) film separation process; The oxygen enrichment of the low-purity of obtaining with the separation process of first order film continues to extract more highly purified oxygen enrichment as unstripped gas; In the film separation process of the second level, at least a portion of the low-purity oxygen enrichment that first order membrane separator per-meate side produces has got into second level membrane separator as unstripped gas, and the per-meate side of membrane separator will obtain more highly purified oxygen enrichment and send into the high-purity demand position of multicenter combustor in the second level; The delay side of membrane separator is discharged remains oxygen enrichment and from the second level; Although its oxygen enrichment level has reduced, but still is higher than the level of normal air 21% oxygen concentration, be enough to satisfy the demand of multicenter combustor than the low-purity oxygen-enriched combustion-supporting.
The present invention with a kind of separation membrane of low separation (selectivity) obtained higher (usually; About 40% (concentration of volume percent) of the oxygen enrichment level that is meant that this is higher; Should adopting more, the parting material of high selectivity could obtain), the oxygen enrichment of lower (still can satisfy combustion-supporting demand) two or more different purity; The combustion-supporting oxygen-enriched air of using of scalable flow is provided for multicenter combustor; Oxygen-enriched air with at least 2 kinds of purity carries out oxygen-enriched combustion-supporting; It has realized with single separation membrane carrying out oxygen-enriched combustion-supporting from the aerial oxygen enrichment that obtains multiple purity for burner provides multiple purity oxidant simply, cheaply, has effectively reduced the lower primary air amount of temperature, has improved the adjusting function of burner.
Description of drawings
Fig. 1 is the combustion-supporting technology diagram (prior art) of cement rotary kiln that adopts the four-way burner.
Fig. 2 is the combustion-supporting technology diagram (prior art) of cement rotary kiln that adopts the triple channel burner.
Fig. 3 is that the present invention adopts the cement rotary kiln of four-way burner to carry out the device diagram of oxygen-enriched combustion-supporting with film oxygen enriching.
Fig. 4 is that the present invention adopts the cement rotary kiln of triple channel burner to carry out the device diagram of oxygen-enriched combustion-supporting with film oxygen enriching.
The specific embodiment
Below in conjunction with accompanying drawing different with explanation the present invention and prior art, and employing the present invention can realize many purity oxygen enrichment, carries out the method and apparatus of oxygen-enriched combustion-supporting for multicenter combustor provides oxidant.
The said separation of this paper like oxygen nitrogen separation, is defined as as the one of which:
α (Alpha) value, oxygen nitrogen separation=(Q N2/Q O2)
Q N2 and Q O2 are respectively under unit interval, the pressure pure component nitrogen and oxygen through the infiltration capacity of certain films material in the formula.
To the film separation process of separating oxygen enrichment in air among the present invention, it is more relevant than the ratio (being called sky oxygen ratio) of (being called the separating pressure ratio) and unstripped gas and oxygen enriched product gas with the absolute pressure of suction side through membrane separator malleation side with oxygen nitrogen separation (being called alpha value), the gas of separation membrane that the purity of oxygen is produced in general film separation, and oxygen nitrogen separation is high more; Mean and than under to isolate more highly purified oxygen rich gas at lower separating pressure ratio and littler empty oxygen; To identical separation membrane, high more, the empty oxygen ratio of oxygen nitrogen separation is bigger and separating pressure is higher than more, can obtain more highly purified oxygen enrichment; On the other hand; It is the infiltration capacity of separation membrane that film separates the flow of producing oxygen enrichment, main relevant with the temperature and the pressure of unstrpped gas, to identical separation membrane; Separation temperature is high more; Infiltration capacity is big more, and separating pressure is high more, and infiltration capacity is big more.
For explaining the technological process of the auxiliary rotary kiln combustion process of film separation process system oxygen-enriched air, referring to Fig. 1, shown in Figure 2.Fig. 1 is the cement rotary kiln combustion-supporting technology flow process diagram (prior art) that adopts the four-way burner, and Fig. 2 is the cement rotary kiln combustion-supporting technology flow process diagram (prior art) that adopts the triple channel burner.Lexical or textual analysis is following:
The A mouth be burner igniting use oil spout interface, B mouth be burner coal wind inlet, the C mouth is burner combustion air enter the mouth (oxygen-enriched inlet of normal air or single purity).In the combustion air inlet, concerning the four-way burner, C1 is an axial flow wind inlet, and C2 is an eddy flow wind inlet, and C3 is a center wind inlet; Concerning the triple channel burner, there has not been this center wind inlet of C3.
In the existing combustion-supporting burning process technology of cement rotary kiln; Mostly adopt like accompanying drawing 1; The combustion-supporting technology of Fig. 2 burner; Wind of its combustion-supporting usefulness (also being the combustion-supporting oxidant of using) gets into burner from the C mouth and participates in burning; The oxygen-enriched air that this wind can be normal air or single purity generally is mixed to fixedly with air by the oxygenerator of the roots blower at the upper reaches or various single purity and the higher oxygen of purity that oxygenerator is produced thereof that the oxygen-enriched air of purity directly supplies to the entering of C mouth again, and is not shown.
Fig. 3, Fig. 4, cement rotary kiln of the present invention illustrates with technology and the device thereof that membrane oxygen enrichment technology carries out oxygen-enriched combustion-supporting, and Fig. 3 adopts the four-way burner, and Fig. 4 adopts the triple channel burner.Lexical or textual analysis is following:
Air is dispeled impurity such as airborne dust through filter AF01 after; Boost to the unstripped gas side A0 that 300～10000Pa gets into first order membrane separator M01 through first equipment (air blast) AB01 that boosts; And exclude the waste gas that is difficult to permeate from remained gas side A1; Easily the gas of infiltration then is oxygen enrichment, is extracted by second equipment (vavuum pump) AB02 that boosts, and A2 leaves first order membrane separator M01 from the outlet of membrane separator infiltration gas.In the separation process of this grade film; According to the different membrane separator that adopts, different separation systems has different separation mechanisms; The purpose of the power-equipment that is provided with is also different; As adopt in the film separation process that rolling or board-like separator carry out, first boosts, and mainly fresh air is provided is main purpose to device A B01 to satisfy, and overcomes the resistance that fluid is carried.Typically, as adopting rolling diaphragm separator, then the first device A B01 that boosts boosts to 1～10kPa, and is preferred, sets up the blast of 2～5kPa, to overcome the gas communication resistance that rolled film itself has; And when adopting board-like film, the first device A B01 that boosts only need set up tens of blast to the hundreds of handkerchief (like 50Pa～800Pa); More have the first device A B01 that boosts is placed on after the board-like film way as the toxic emission blower fan, purpose also only is in order to overcome resistance that raw air gets into membrane separator so that the purpose of fresh air constantly to be provided.Simultaneously, second boosts, and then mainly to separate required pressure ratio be main purpose to device A B02 to satisfy, and the separating pressure ratio of promptly setting up the diffusion barrier both sides of first order membrane separator M01 is 3～10.Typically, when diffusion barrier adopts the rolled film that alpha value makes at 2～3 separation membrane, board-like film, when required oxygen-enriched purity is 30% left and right sides; The separating pressure ratio that need set up the skinning both sides is about 4; That is, be the blast of 2～5kPa like the malleation lateral pressure of diffusion barrier, absolute pressure is atmospheric pressure (101.325kPa)+(2～5kPa); Then suction side should be set up the absolute pressure of the about 25kpa vacuum of 75kPa gauge pressure (be equivalent to-); Like this, the separating pressure ratio is for ((4 times of 2～5kPa)/25 ≌ can obtain about oxygen-enriched purity of about 30% (concentration of volume percent) to 101.325+.Obviously; In this process; First boosts device A B01 for keeping separating pressure than being about 4 to provide the blast of fresh air more limited than contribution to separating pressure, is main to satisfy the required resistance that overcomes of conveying only, and the vacuum power of second boosts about 25kpa that device A B02 provides is only the major impetus source of satisfying the separating pressure ratio; Through this first order film separation process, can obtain the oxygen rich gas of about 30% oxygen-enriched purity.
In implementation process of the present invention, the oxygen rich gas that the first order produces is not directly sent into stove and is carried out oxygen-enriched combusting, but the oxygen rich gas that the separation process of first order film is produced is continued to get into second level film separation process.In the membrane separator of the second level; Consistent with the separation process of the first order; Different is, with the infiltration gas in the membrane separator of the first order (oxygen rich gas, purity about 30%) as unstripped gas; Second boosts device A B02 not only as the major impetus source of first order film separation process; In order to setting up the required pressure ratio of first order film separation process, and can also overcome and be exported to the resistance of separator M02 remained gas outlet A1 in the second level between kiln burning device inlet, even comprise and overcome the required blast of kiln burning device; Certainly, also can boost equipment in order to overcoming along journey transporting resistance and the required blast of kiln burning device from second equipment (vavuum pump) the AB02 outlet back serial connection of boosting, the second device A B02 that boosts then only is used to set up the required pressure ratio of film separation process; AB03 and AB02 are similar, and main purpose is to set up the 2nd grade of required pressure ratio of film separation process, and overcome the resistance that is exported between the kiln burning device inlet, even comprise and overcome the required blast of kiln burning device; Certainly, also can boost to be connected in series after equipment vavuum pump AB03 exports from the 3rd and boost equipment in order to overcome along journey transporting resistance and the required blast of kiln burning device, AB03 then only be used to set up the required pressure ratio of film separation process.
By on can know, through the unstripped gas of this 2nd grade of film separation process infiltration gas, and after this 2nd grade of film separation process from the 1st grade of film separation process; It is remained gas that the oxygen enrichment infiltration gas of prime is divided into 2 the tunnel, the one tunnel, from being detained gas port output; It is oxygen enrichment than low-purity; Typically, purity still can satisfy the demand of oxygen-enriched combustion-supporting between 23%～30%; Another road is an infiltration gas, from infiltration gas port A2 output, is the oxygen rich gas of higher degree; Typically, purity is between 30%～50%, and is more typical; About about 40%; The different parts that divides the two-way oxygen rich gas to send into burner respectively like this carries out oxygen-enriched combusting, makes the modulability of oxygen-enriched combusting strengthen, and more can significantly improve the effect of oxygen-enriched combusting.The prior art of comparing, the present invention can obtain the raising of 20%～80% energy-saving benefit.
Among the present invention,, improved the present situation of center coal wind anoxic because the oxygen-enriched air of higher degree gets into the air port, center; The after-flame degree of coal dust and the speed of burning improve, and especially low-calorie coal are had more the characteristics of improving igniting, retention flame shape, and the oxygen enrichment of a large amount of more low-purity gets into stove because of getting into outer axial flow wind high velocity jet; The high temperature secondary air of a large amount of process of injection and grog heat exchange and mix with it after; Form a kind of oxygen enrichment that mixes through high temperature, strengthened coal dust firing, further improved flame blackness; Strengthened heat transfer efficiency, thereby practiced thrift energy, improved economic benefit.
Angle from membrane separation technique; The present invention has obtained the oxygen enrichment of two kinds of purity simultaneously with a kind of separation membrane of low separation (selectivity): higher degree (this higher oxygen enrichment level about 40% should adopt more the parting material of high selectivity could obtain) usually, (still can satisfy combustion-supporting demand than low-purity; Generally still near 30%) the oxygen enrichment of two or more different purity; Typically; The present invention adopts the parting material of oxygen nitrogen separation (alpha value) 2.0, can obtain the oxygen rich gas of about purity 30% and 40% two kind of purity of purity.
Angle from oxygen-enriched combustion-supporting technology; Separation process of the present invention has combined the oxygen-enriched combusting process required; For multicenter combustor provides a kind of supply method of many purity oxidant, widened common multicenter combustor and only can regulate combustion air volume, and can not regulate the burning-aid method of oxygenate content.And combustion-supporting technology method of the present invention is supplied to the outer axial flow air port of multicenter combustor with the oxygen enrichment of low-purity, and the high-purity oxygen enrichment is supplied to the air port, center of multicenter combustor; A kind of like this combustion-supporting technology; Further reduce the lower primary air amount of temperature, improved the adjusting function of burner, got into the air port, center because of the high-purity oxygen enrichment simultaneously; Improve the present situation of center anoxic, further promoted the effect of oxygen-enriched combustion-supporting.And the present invention need not the high-temperature-resistant structure that changes existing burner, rotary kiln and decompose kiln outward.
It is that the cement rotary kiln oxygen-enriched combusting provides oxidant that the present invention is applied to adopt the film separation process with constituent of air, but disclosed basic principle can be used for much other separation occasions, especially needs the application scenario of many purity oxygen enrichment.
Shown in Figure 4 like accompanying drawing 3, one is complete with the combustion-supporting device that the combustion-supporting technology method of multiple different purity oxidant is provided of film oxygen enriching, which comprises at least:
1, at least one filter AF01 is used to filter the impurity such as dust that get into membrane separator M01;
2, at least one device A B01 that boosts is that the 1st grade of membrane separator M01 provides fresh air, perhaps will exclude membrane separator through the waste gas of first order membrane separator M01;
3, at least one group of membrane separator M01 is as the 1st grade of film separation process; Its unstripped gas interface is connected in series to the back of filter AF01; If AB01 is the 1st grade of membrane separator M01 fresh air is provided; Serial connection sequence is followed successively by filter AF01 and receives the device A B01 that boosts, and the device A of boosting B01 receives first order membrane separator M01 feed side again; If it is in order will to discharge through the waste gas of membrane separator M01 that AB01 is provided with, serial connection sequence is followed successively by filter AF01 and receives the first membrane separator M01 feed side, and first order membrane separator M01 is detained side outlet and receives the device A B01 inlet that boosts;
3, at least one device A B02 that boosts; Its inlet is concatenated into the per-meate side of the one 1 grade of membrane separator M01; And oxygen rich gas sent into the unstripped gas side of the 2nd grade of membrane separator M02, preferred but non-essential behind the device A B02 that boosts the other equipment that the boosts (not shown) of serial connection insert the unstripped gas side of membrane separator M02 again;
4, at least one group of membrane separator M02 is as the 2nd grade of film separation process; Its unstripped gas interface serial connection is to the back of the device A B02 that boosts, preferred but non-essential behind membrane separator M02 the other equipment that the boosts (not shown) of serial connection insert the axial flow wind inlet of stove multichannel burning again;
5, at least one device A B03 that boosts; Its inlet is concatenated into the per-meate side of the 22 grade of membrane separator M02; And oxygen rich gas sent into the center wind inlet of stove multichannel burning, preferred but non-essential behind the device A B03 that boosts the other equipment that the boosts (not shown) of serial connection insert the center wind inlet of stove multichannel burning again.
InstanceBoard-like membrane separator is the system that the cement rotary kiln oxygen-enriched combustion-supporting of 1250 tons of daily outputs provides oxidant; This system's kiln head and tail has all adopted the triple channel burner; Wherein the coal-fired ratio between kiln hood and the kiln tail is 40%:60%, and the triple channel burner that the oxygen enrichment that design is produced two kinds of different purity with 2 grade coupled membrane separation techniques is respectively kiln hood, kiln tail provides the oxygen enrichment that replaces axial flow wind, purity requirement 28-30%; Oxygen enrichment flow 2700Nm3/hr.; In addition, one tunnel purity 40% is provided, the oxygen enrichment of flow 300Nm3/hr. replaces the clean wind of part as center axial flow wind and carries out oxygen-enriched combustion-supporting.
Membrane separator plate used Oxylead Membrane separator plate, by the Shanghai Industrial Co., Ltd. Mizuho fir, may be obtained commercially, and its separation membrane materials used in oxygen and nitrogen at 25 ℃ under the separation factor of 2.05, the oxygen permeation an amount of 5.068? Nm3/hr.bar.m2, permeation amount of nitrogen 2.479? Nm3/hr.bar.m2, oxygen to meet these requirements, the following table design conditions, a set of design choice 3000Nm3/hr. single component separator, which is filled with a 823.2? m2 membrane material, and the other selected an assembly filled 77.9? m2 membrane material separator.Divide two-stage to separate; Prime is separated to obtain the oxygen enrichment of about 30% purity; Back level continues to carry out secondary as unstripped gas separates, and obtains about 40% oxygen enrichment in the per-meate side of 2 grades of film separation processes, and that the oxygen enrichment that prime gets into secondary is detained the degree that reduces because of its oxygen enrichment quality when side is discharged from secondary is not high; Still can satisfy purity about 28% and export, as satisfying the oxygen enrichment that replaces axial flow wind for the triple channel burner 2 grades delay side.Under following design condition,, obtained the oxygen enrichment that obtains two kinds of different purity simultaneously and carried out oxygen-enriched combustion-supporting to the triple channel burner with the film separation system of this cover coupling; Like accompanying drawing 2, wherein than low-purity oxygen-enriched purity 28.44%, oxygen enrichment flow 2700.0 Nm3/hr; The triple channel burner that is respectively kiln hood, kiln tail is in coal-fired ratio 40%:60% oxygen supply, and the C1 interface of sending into the triple channel burner carries out oxygen-enriched combusting, and the C1 interface is also referred to as axial flow wind, outer air port; And the oxygen-enriched purity 40.31% of higher degree; Oxygen enrichment flow 300.0 Nm3/hr, the triple channel burner that also is respectively kiln hood, kiln tail is in coal-fired ratio 40%:60% oxygen supply, and the A interface of sending into the triple channel burner carries out oxygen-enriched combustion-supporting; The A interface is also referred to as the air port, center, has obtained the economic benefit of ton grog saving mark coal 15% through test.
Same; Like accompanying drawing 2, with aforementioned design alternative that the group 3000Nm3/hr. the unimodule separator, the interior 823.2 m2 membrane materials that loaded; Separation can obtain the oxygen enrichment of 29.63% purity; The triple channel burner that also is respectively kiln hood, kiln tail is in coal-fired ratio 40%:60% oxygen supply, and the C interface of directly sending into the triple channel burner carries out oxygen-enriched combusting, has only obtained the economic benefit of ton grog saving mark coal 9.5% through test.This shows that different parts that the present invention sends into burner with the oxygen enrichment of different purity respectively carries out the benefit that oxygen-enriched combustion-supporting obtains and improved nearly 50%.
Above described embodiment only set forth key characters more of the present invention, the professional and technical personnel should be understood that all do not violate essence that the present invention sets forth other change and also belong to category of the present invention.
Claims (4)
1. one kind is the method that cement rotary kiln multicenter combustor oxygen-enriched combustion-supporting provides oxygen rich gas; It is characterized in that concrete steps do; Structure and burning feature according to the multicenter combustor of cement rotary kiln; At first adopt membrane separation technique, in air, separate the oxygen rich gas that obtains two kinds of different purity; Then, the oxygen rich gas of two kinds of different purity is sent into the different parts of the multicenter combustor of cement rotary kiln respectively, carry out oxygen-enriched combustion-supporting;
Wherein, described membrane separation technique adopts the two-stage separating step of two-stage membrane separation device, and this two-stage membrane separation device comprises, two-stage membrane separator, an air cleaner AF01,3 boost device A B01, AB02, AB03; Wherein, in the membrane separator, each membrane separator has 1 unstripped gas inlet A0 at least; 1 remained gas outlet A1,1 infiltration gas outlet A2, the diffusion barrier in the membrane separator is divided into both sides at least; One side is the malleation side; One side is a suction side, and the malleation side also is the unstripped gas side of membrane separator, and suction side also is the infiltrating gas side of membrane separator; Air cleaner AF01 is connected by pipeline and the first device A B01 that boosts, and the first device A B01 that boosts is connected by the unstripped gas inlet A0 of pipeline and first order membrane separator M01; The infiltration gas of first order membrane separator M01 outlet A2 is connected by pipeline and the second device A B02 that boosts; The second device A B02 that boosts is connected by the unstripped gas inlet A0 of pipeline and second level membrane separator M02, and the infiltration gas of second level membrane separator M02 exports A2 and is connected by pipeline and the 3rd device A B03 that boosts; The 3rd device A B03 that boosts is connected by the center wind inlet of pipeline and cement rotary kiln multicenter combustor, and the oxygen rich gas of higher degree is sent into multicenter combustor; The remained gas outlet A1 of second level membrane separator M02 is connected with the axial flow wind inlet of cement rotary kiln multicenter combustor by pipeline, will send into multicenter combustor than the oxygen rich gas of low-purity.
2. the method that oxygen rich gas is provided for cement rotary kiln multicenter combustor oxygen-enriched combustion-supporting according to claim 1; It is characterized in that said first order membrane separator M01 and second level membrane separator M02; All compose in series, specifically confirm according to actual needs by a plurality of membrane separators; The diffusion barrier of said membrane separator adopts rolled film or board-like film.
3. according to claim 2 for cement rotary kiln multicenter combustor oxygen-enriched combustion-supporting provides the method for oxygen rich gas, it is characterized in that said first blast that device A B01 sets up that boosts is 300～10000Pa; Second boosts, and separating pressure ratio that device A B02 sets up the diffusion barrier both sides of first order membrane separator M01 is 3～10.
4. the method that oxygen rich gas is provided for cement rotary kiln multicenter combustor oxygen-enriched combustion-supporting according to claim 3; The volumetric concentration of oxygen rich gas of delay gas port A1 output that it is characterized in that said the 2nd grade of membrane separator is between 23%～30%, and the volumetric concentration of the oxygen rich gas of infiltration gas port is between 30%～50%.
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| CN104033891A (en) * | 2014-06-10 | 2014-09-10 | 河南嘉和节能科技有限公司 | Oxygen-enrichment combustion assisting method of oxygen enrichment device of combustor of cement decomposing furnace |
| CN104033893A (en) * | 2014-06-28 | 2014-09-10 | 广西聚为能源科技有限公司 | Oxygen-enriched combustion system of cement klin |
| CN104132337A (en) * | 2014-08-06 | 2014-11-05 | 刘国忠 | Multi-channel cement oxygen enrichment low-carbon burner |
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| CN111115581A (en) * | 2020-01-06 | 2020-05-08 | 南京航空航天大学 | High-purity onboard oxygen generation-nitrogen generation system based on membrane separation technology and working method |
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| CN110500583A (en) * | 2019-09-11 | 2019-11-26 | 襄阳中和机电技术有限公司 | A kind of pulsation-free burner of flame stabilization and method for controlling combustion |
| CN111115581A (en) * | 2020-01-06 | 2020-05-08 | 南京航空航天大学 | High-purity onboard oxygen generation-nitrogen generation system based on membrane separation technology and working method |
| CN111115581B (en) * | 2020-01-06 | 2021-04-27 | 南京航空航天大学 | High-purity onboard oxygen generation-nitrogen generation system based on membrane separation technology and working method |
| CN112857030A (en) * | 2021-02-28 | 2021-05-28 | 上海穗杉实业股份有限公司 | Oxygen supply method and device for oxygen-enriched combustion of rotary cement kiln |
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