CN102032585B - Integrated pulverized coal separation and concentration device of pulverized-coal boiler - Google Patents
Integrated pulverized coal separation and concentration device of pulverized-coal boiler Download PDFInfo
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- CN102032585B CN102032585B CN 201010568040 CN201010568040A CN102032585B CN 102032585 B CN102032585 B CN 102032585B CN 201010568040 CN201010568040 CN 201010568040 CN 201010568040 A CN201010568040 A CN 201010568040A CN 102032585 B CN102032585 B CN 102032585B
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Abstract
The invention relates to an integrated pulverized coal separation and concentration device of a pulverized-coal boiler, which comprises an axial type coarse pulverized coal separator of which the bottom is connected with a coal mill (1) by a pulverized coal return pipe (16) and the top is connected with a tangential extraction axial type pulverized coal concentrator; the coarse pulverized coal separator comprises an inlet section (2), a closed inner cylinder body (6) provided with a circular truncated cone bottom (4), a shell (3), a ring-shaped diversion ring (5) and an axial blade (7) of the coarse pulverized coal separator; an outlet on the top of the coarse pulverized coal separator is a tapered necking hole (8); the pulverized coal concentrator comprises a cylindrical shell (9), a pulverized coal concentrator swirl stabilizer (11) provided with a straightening vane (10), an internal inserting type exhaust gas lead-out circular tube (12) and an exhaust gas outlet circular tube (14) which are connected together into a whole, a hot air inlet (15) and a concentration outlet (13); and pulverized coal air flow which has high oxygen quantity and concentration and is formed by mixing hot air coming from the hot air inlet with the pulverized coal coming from the concentration outlet at the end of the concentration outlet is filled into a primary air flow pipeline of the boiler. The invention realizes pulverized coal separation and concentration with high performance and low resistance, and has the advantages of being high in pulverization output, low in pulverization electricity consumption, fine in pulverized coal, good in pulverized coal uniformity, excellent in concentration performance, flexible in adjustment, etc.
Description
Technical field
The invention belongs to thermal power engineering relevant device field, be specifically related to the device that a kind of burning high-moisture brown coal (coal-fired moisture as received coal 〉=40%) pulverized-coal fired boiler integrates the separation of pulverized coal preparation system coal dust and combustion system Pulverized Coal Concentration function.
Background technology
About 1.5～40,000 years of the address burial age of brown coal buries age and carbonizing degree difference according to its geology, can be divided into young brown coal and old brown coal.Old brown coal carbonizing degree is darker, and institutional framework is fine and close, and outward appearance is pitchy, its calorific value and phosphorus content are relatively high, moisture as received coal content is generally below 35%, and the dry ash free basis volatile matter is generally 40%～50%, and the As-received low heat valve is between 10MJ/kg～16MJ/kg.Young brown coal also are that high-moisture brown coal carbonizing degree is more shallow, and it is brown that outward appearance is, and content of lignin is high, moisture as received coal mostly is 40%～65%, extremely individually can be up to 70%, the dry ash free basis volatile matter is generally more than 50%, and the As-received low heat valve is between 5MJ/kg～9MJ/kg.China's lignite resource is abundant, and wherein senile brown coal are mainly concentrated and are distributed in the Northeast, the Inner Mongol and Yunnan Province.Young brown coal mainly concentrates on Yunnan Province, also exists some moisture as received coals to reach 40% high-moisture brown coal at Eastern Inner Mongolia.
China is relatively less in the research aspect pulverized-coal fired boiler powder process and the burning to the high-moisture brown coal, also only only has at present No. 1 boiler of the state extra large electricity generating corporation, Ltd of electricity sun ancestor all to keep moisture as received coal 〉=42% the employed coal-fired whole year.For the powder process aspect: when brown coal moisture too high (〉=40%) or caloric value excessively low (＜9MJ/kg) time, because pulverizing process needs a large amount of drier to be used for drying brown coal, therefore, drying capacity to pulverized coal preparation system, ventilation is exerted oneself and blower fan lifting pressure head is all had higher requirement, in the limited situation of blower mill impeller outer edge maximum line velocity, the unrestricted size that increases coal pulverizer is unpractical, therefore, increasing the ventilation of blower mill and improve fineness of pulverized coal by improving and optimizating of pulverized coal preparation system is effective a kind of method; For the burning aspect: a large amount of drier consumptions will cause from pulverized coal preparation system wind powder mixture out coal powder density excessively low, simultaneously again because oxygen concentration low (significant proportion is flue gas in the drier) in wind, so that it is higher and theoretical temperature combustion that can reach is on the low side directly to light the required ignition heat of such breeze airflow, cause easily the difficulty of steady combustion.At present except No. 1 boiler of the state electricity sun extra large electricity generating corporation, Ltd of ancestor, China there is no the application example of tangentially drawing the axialmode pulverized coal concentrator and the ripe design experiences of oneself in the past, more the incoming flow of inspissator can't be divided into direct current or eddy flow is distinguished design, but along with following China utilizes continually developing of high-moisture brown coal and to external engineering, technology export, the application prospect of this technology will be day by day wide.
Summary of the invention
The present invention be directed to above-mentioned domestic high-moisture brown coal (coal-fired moisture as received coal 〉=40%) pulverized-coal fired boiler remain aspect powder process and the burning blank, provide that a kind of Mill output is higher, the powder process power consumption is lower, coal dust is thinner, pulverized coal fineness is better, the concentrated coal dust that performance is more excellent and flexible adjustment is larger separates and concentration integrated device.
The present invention realizes goal of the invention by following content:
The pulverized-coal fired boiler coal dust separates and concentration integrated device, comprise the bottom by powder retrieving pipe be connected with coal pulverizer, top and the axial meal separator of tangentially drawing the axialmode pulverized coal concentrator and being connected; Described mill separator comprises the entrance that is connected with coal pulverizer, be positioned at entrance top with the sealing inner barrel at the bottom of the cylinder step, cover in entrance epimere and the outer shell of sealing inner barrel, annular baffle liner between sealing inner barrel and shell, be installed on the adjustable mill separator axial blade of angle on the baffle liner, the mill separator top exit is the taper reducing; Described pulverized coal concentrator comprises the cylinder blanket that the bottom is connected with the taper reducing, be positioned at the swirl stabilized device of the pulverized coal concentrator with straightener(stator) blade of cylindrical section shell, the weary gas of interpolation type that is positioned at swirl stabilized device top is drawn pipe and is drawn the weary gas outlet pipe that pipe connects as one with weary gas, be arranged at the hot-wind inlet in the cylinder blanket outside, take tangentially as the concentrated outlet of starting point, pass into a general mood stream of boiler pipeline from the hot blast of hot-wind inlet and from the coal dust that concentrates outlet at the mutual high concentration pulverized coal air-flow with higher oxygen amount that forms that mixes of the end of concentrated outlet in the cylinder blanket incision.
In the swirl stabilized device of pulverized coal concentrator of the present invention is the blade of fixed blade or adjustable angle with straightener(stator) blade.The mill separator axial blade that described baffle liner upper angle is adjustable, blade adjust angle with 0 ° to 90 ° of horizontal direction angles in equal difference regulate.Be provided with at mill separator sealing inner barrel top one with the cone cap of horizontal direction angle above 40 °; The concentrated breeze airflow of drawing is divided into 1 to 3 strand by dividing plate.Powder retrieving pipe dwindles structure gradually for being tilted to down, and the ratio of the narrowest throat of powder retrieving pipe cross-sectional area and the per second gas flow that enters axial pulverized coal concentrator was less than 1: 300.Described straightener(stator) blade is flat prismatic blade, and the angle of straightener(stator) blade and horizontal direction is between 30 ° to 60 °.
Apparatus of the present invention can realize that the coal dust of high-performance, lower resistance separates with concentrated, compare with the pulverized coal concentrator of traditional pulverized coal preparation system mill separator and combustion system to have that Mill output is higher, the powder process power consumption is lower, coal dust is thinner, pulverized coal fineness is better, concentrate the advantages such as the more excellent and flexible adjustment of performance is larger.
Further set forth content of the present invention below in conjunction with Figure of description.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is that apparatus of the present invention are installed on the schematic diagram in the steam generator system.
Among the figure, the 1-coal pulverizer; The 2-entrance; The 3-shell; At the bottom of the 4-cylinder step; 5-annular baffle liner; 6-seals inner barrel; 7-mill separator axial blade; 8-taper reducing; The 9-cylinder blanket; The 10-straightener(stator) blade; The swirl stabilized device of 11-; The weary gas of 12-interpolation type is drawn pipe; The concentrated outlet of 13-; The weary gas outlet of 14-pipe; The 15-hot-wind inlet; The 16-powder retrieving pipe.
The specific embodiment
As shown in the figure, the present invention is a kind of device that integrates coal dust separation and concentrating function that is applied to high-moisture brown coal (moisture as received coal 〉=40%) pulverized-coal fired boiler.Comprise the bottom by powder retrieving pipe 16 be connected with coal pulverizer 1, top and the axial meal separator of tangentially drawing the axialmode pulverized coal concentrator and being connected.Axial meal separator comprises the entrance 2 that is connected with coal pulverizer 1, be positioned at entrance top with 4 sealing inner barrel 6 at the bottom of the cylinder step, cover in the shell 3 outside entrance 2 epimeres and the sealing inner barrel 6, annular baffle liner 5 between sealing inner barrel 6 and shell 3, be installed on the adjustable mill separator axial blade 7 of angle on the baffle liner, the mill separator top exit is taper reducing 8.Tangentially draw the cylinder blanket 9 that the axialmode pulverized coal concentrator comprises that the bottom is connected with taper reducing 8, be positioned at the swirl stabilized device 11 of the pulverized coal concentrator with straightener(stator) blade 10 of cylindrical section shell, the weary gas of interpolation type that is positioned at swirl stabilized device top is drawn pipe 12 and is drawn the weary gas outlet pipe 14 that pipe connects as one with weary gas, at cylinder blanket 9 arranged outside hot-wind inlets 15, cut take tangentially as the concentrated outlet 13 of starting point at cylinder blanket 9, from the hot blast of hot-wind inlet 15 with pass into general mood of boiler from the coal dust of concentrated outlet 13 at the terminal high concentration pulverized coal air-flow with higher oxygen amount that mutually mixes formation of concentrated outlet 13 and flow pipeline.The isolated rough coal powder of mill separator returns to coal pulverizer 1 by powder retrieving pipe 16 and again grinds.The high concentration pulverized coal air-flow with higher oxygen amount that forms after concentrated is to be drawn by tangential direction by institute's gap on pulverized coal concentrator cylinder blanket 9, the concentrated breeze airflow of drawing can be divided into 1 to 3 strand, breeze airflow gas flow after per share the concentrating accounts for and enters 10% to 30% of pulverized coal concentrator gas flow, the coal dust total amount accounts for 50% to 85% of the pulverized coal concentrator coal dust amount that enters in each strand breeze airflow after concentrated, and the hot blast total amount that is entered wind pulverized coal borne air flow that mixes of concentrated breeze airflow (hot blast with) by hot-wind inlet 15 accounts for 5% to 40% of a wind total amount.
The present invention with axial meal separator with tangentially draw axialmode pulverized coal concentrator tandem compound, the formed swirling eddy of axial meal separator kept and be incorporated into tangentially drawing in the axialmode pulverized coal concentrator of being connected in series with it, last rectified action before straightener(stator) blade 10 on the swirl stabilized device 11 of pulverized coal concentrator only concentrates the rotary pneumatic flow field, like this eddy flow is carried out the mode that secondary utilizes, in can resolution system because flow field direction changes the inconsistent system's drag overall problem bigger than normal that produces, and after reducing system's drag overall, the ventilation of fan mill is thereupon corresponding increase also, and having reached increases the purpose that pulverized coal preparation system is exerted oneself.Mill separator adopts and with the round platform on 4 the mill separator sealing inner barrel 6 at the bottom of the cylinder step breeze airflow by mill separator entrance 2 to be carried out primary collision and separate.The mill separator that the selection in domestic blower mill is joined is the mill separator of single current inertia deflector baffle pattern, such separator causes separative efficiency not high because separation principle comparatively falls behind, and the present invention has adopted the axial meal separator that has carried out special optimization for blower mill, the primary collision that carries out in inner core step bottom surface by coal dust and the secondary collision that carries out at baffle liner and urceolus, fast the defective coal dust of larger particles is separated, produce eddy flow and enter the axial blade zone through Preliminary screening and the breeze airflow that carries out the homogenization of overcurrent field, under the acting in conjunction of centrifugal action and natural subsidence principle, carry out final for the third time qualified coal dust and separate.Owing to adopted more scientific and reasonable separate mode, so that coal dust is thinner, the better purpose of pulverized coal fineness is guaranteed.Breeze airflow after primary collision separates carries out secondary collision deceleration separation at mill separator shell 3 and annular baffle liner 5 after break-in, and carry out the homogenising in flow field by 5 pairs of breeze airflows of annular baffle liner, so that it is more even to enter into the airflow field of axial blade 7.The air-flow of homogenization enters mill separator axial blade 7 zones, produces eddy flow under the guide effect of blade, and utilizes centrifugal action with settlement action coal dust finally to be separated.The adjustment angle of the mill separator axial blade 7 that angle is adjustable with 0 ° to 90 ° of horizontal direction angles in equal difference regulate, the adjusting angle difference is in 4 °.Generally speaking the angular range of mill separator axial blade 7 work be and the horizontal direction angle between 26 ° to 60 °.Arrange one at mill separator sealing inner barrel 6 tops and surpass 40 ° cone cap 6a with the horizontal direction angle, its effect is that to cross the low accumulated powder that forms regional because of flow velocity in order to eliminate the top center zone.
Be connected with pulverized coal concentrator cylindrical section shell 9 by a taper reducing 8 that suppresses the coal dust diffusion at outlet of coarse powder separating device, too much spread to cylinder blanket 9 centers to avoid coal dust.Enter the coal dust swirling eddy of pulverized coal concentrator, rectification before under the effect of straightener(stator) blade 10, concentrating, and the breeze airflow after will concentrating is respectively drawn by tangential direction by institute's gap on pulverized coal concentrator cylinder blanket 9, contain the less weary gas of powder and draw pipe 12 by the weary gas of interpolation type and draw, concentrated coal dust and hot blast from hot-wind inlet 15 mix mutually and form general mood of boiler that high coal powder density has the higher oxygen amount and flow simultaneously.The powder retrieving pipe 16 that mill separator separates takes the form of oblique lower convergent that the isolated defective coal pulverizer of slightly illegally sending back to of separator is ground again.Powder retrieving pipe 16 cross-sectional area (units: m of the narrowest throat
2) with enter the per second real gas flow (unit: m of pulverized coal concentrator
3/ s) the ratio of numerical value was less than 1: 300.Employing is tilted to down the powder retrieving pipe that dwindles gradually version, can guarantee in smooth and easy time powder, overcome to greatest extent because there is the air flow shortcircuit that causes in powder retrieving pipe, thereby increased again conversely the clean ventilation of pulverized coal preparation system, Mill output is promoted, and in the situation of the gas flow that does not change fan mill, it is very little that the power consumption of fan mill changes, but the lifting of powder process amount can be so that the power consumption of pulverized coal preparation system be lower.The present invention takes the abrasionproof measures such as welding ceramics, hexsteel, spraying at the easy abration position of device such as positions such as mill separator shell 3, baffle liner 5, mill separator axial blade 7, outlet of coarse powder separating device taper reducing 8, pulverized coal concentrator cylindrical section shell 9, concentrated outlets 13.At outlet of coarse powder separating device a taper reducing 8 that suppresses the coal dust diffusion being set is connected with pulverized coal concentrator, the effect of this taper reducing is by the changeover portion of a convergent so that enter the progressively break-in of swirling eddy of pulverized coal concentrator, thereby avoids coal dust too much to spread to cylindrical section shell center.Guaranteed that like this coal dust that enters pulverized coal concentrator more concentrates near the outer wall, has guaranteed next step concentrated effect.The breeze airflow that enters pulverized coal concentrator is swirling eddy, and straightener(stator) blade 10 is flat prismatic blade, blade in normal operation and the angle of horizontal direction be between 30 ° to 60 °.The present invention carries out final flow field by the straightener(stator) blade 10 on the swirl stabilized device of pulverized coal concentrator with swirling eddy and adjusts, and guarantees to enter swirl strength and the designing requirement of band powder rate load of concentrated outlet and the outlet of weary gas.Simultaneously, owing to be provided with rational inspissator air-flow, Pulverized Coal Concentration parameter and eddy flow wind proportionate relationship, the boiler that can avoid Pulverized Coal Concentration to cause not surely fires difficulty, also can avoid the defeated powder difficulty of a wind causing owing to the Pulverized Coal Concentration transition, also guarantee simultaneously to have in wind sufficient oxygen amount that the after-flame in required and later stage at burning initial stage is provided.The concentrated performance that has guaranteed pulverized coal concentrator by above measure is more excellent.
Apparatus of the present invention also will arrange recirculation airduct 17 as shown in Figure 2 in the blast pipe road in the system integration, recirculation air door 18 is connected with high temperature drying agent pipeline 19, weary gas air door 20 also is set simultaneously, when pulverized coal preparation system need to reduce Mill output, recirculation air door and weary gas air door can be used, guarantee so the larger requirement of flexible adjustment of pulverized coal preparation system.
The above is detailed description of the present invention, not in order to limit the present invention.To those of ordinary skill in the art, can also make on the basis of the above description other multi-form variation or change.All any modifications of making within the technology of the present invention contains, the variation or the change that are equal to replacement and amplify out all are included in protection scope of the present invention.
Claims (7)
1. the pulverized-coal fired boiler coal dust separates and concentration integrated device, it is characterized in that:
1. comprise the bottom by powder retrieving pipe (16) be connected with coal pulverizer (1), top and the axial meal separator of tangentially drawing the axialmode pulverized coal concentrator and being connected;
2. described mill separator comprises the entrance (2) that is connected with coal pulverizer (1), be positioned at the sealing inner barrel (6) with (4) at the bottom of the cylinder step of entrance top, cover in entrance (2) epimere and the outer shell (3) of sealing inner barrel (6), be positioned at the annular baffle liner (5) between sealing inner barrel (6) and the shell (3), be installed on the adjustable mill separator axial blade (7) of angle on the baffle liner, the mill separator top exit is taper reducing (8);
3. described pulverized coal concentrator comprises the cylinder blanket (9) that the bottom is connected with taper reducing (8), be positioned at the swirl stabilized device of pulverized coal concentrator (11) of the band straightener(stator) blade (10) of cylindrical section shell, the weary gas of interpolation type that is positioned at swirl stabilized device top is drawn pipe (12) and is drawn the weary gas outlet pipe (14) that pipe connects as one with weary gas, be arranged at the hot-wind inlet (15) in cylinder blanket (9) outside, cut take tangentially as the concentrated outlet (13) of starting point at cylinder blanket (9), from the hot blast of hot-wind inlet (15) with pass into general mood of boiler from the coal dust of concentrated outlet (13) at the terminal high concentration pulverized coal air-flow with higher oxygen amount that mutually mixes formation of concentrated outlet (13) and flow pipeline.
2. pulverized-coal fired boiler coal dust according to claim 1 separates and concentration integrated device, it is characterized in that: the band straightener(stator) blade (10) in the swirl stabilized device of pulverized coal concentrator (11) is the blade of fixed blade or adjustable angle.
3. pulverized-coal fired boiler coal dust according to claim 1 separates and concentration integrated device, it is characterized in that: the mill separator axial blade (7) that described baffle liner upper angle is adjustable, blade adjust angle with 0 ° to 90 ° of horizontal direction angles in equal difference regulate.
4. pulverized-coal fired boiler coal dust according to claim 1 separates and concentration integrated device, it is characterized in that: be provided with at mill separator sealing inner barrel (6) top one with the cone cap (6a) of horizontal direction angle above 40 °;
5. pulverized-coal fired boiler coal dust according to claim 1 separates and concentration integrated device, and it is characterized in that: the concentrated breeze airflow of drawing is divided into 1 to 3 strand by dividing plate;
6. pulverized-coal fired boiler coal dust according to claim 1 separates and concentration integrated device, it is characterized in that: powder retrieving pipe (16) dwindles structure gradually for being tilted to down, and the ratio of the narrowest throat of powder retrieving pipe (16) cross-sectional area and the per second gas flow that enters axial pulverized coal concentrator was less than 1: 300.
7. pulverized-coal fired boiler coal dust according to claim 2 separates and concentration integrated device, and it is characterized in that: described straightener(stator) blade (10) is flat prismatic blade, and the angle of straightener(stator) blade and horizontal direction is between 30 ° to 60 °.
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| CN 201010568040 CN102032585B (en) | 2010-12-01 | 2010-12-01 | Integrated pulverized coal separation and concentration device of pulverized-coal boiler |
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| CN 201010568040 CN102032585B (en) | 2010-12-01 | 2010-12-01 | Integrated pulverized coal separation and concentration device of pulverized-coal boiler |
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| CN102032585B true CN102032585B (en) | 2013-03-20 |
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| CN104096630B (en) * | 2013-04-08 | 2016-08-24 | 国家电网公司 | A kind of bottom of medium-speed mill structure |
| PL2993400T3 (en) * | 2014-09-02 | 2020-05-18 | General Electric Technology Gmbh | A combustion system |
| UA112277C2 (en) * | 2016-03-09 | 2016-08-10 | Вадим Володимирович Бурукін | METHOD OF IMPELLER GAS EXHAUST IN AERODYNAMIC SEPARATORS, AERODYNAMIC SEPARATOR AND AIR BREEDING UNIT OF THE AERODYNAMIC SEPARATOR |
| CN109174422B (en) * | 2018-09-04 | 2023-05-05 | 北京慧峰仁和科技股份有限公司 | Coal mill and method for improving uniformity of coal dust |
| CN111852364B (en) * | 2020-07-29 | 2022-03-01 | 中国石油化工股份有限公司 | Cyclone separation and mechanical crushing type coal dust cleaning system and working method thereof |
| CN115870096B (en) * | 2023-03-04 | 2023-05-16 | 常州华福环境科技股份有限公司 | Blowing electromagnetic pulse valve for bag type dust collector |
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