CN103185337A - Anti-abrasion and attrition-reducible circulating fluidized bed boiler - Google Patents
Anti-abrasion and attrition-reducible circulating fluidized bed boiler Download PDFInfo
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- CN103185337A CN103185337A CN2013101137914A CN201310113791A CN103185337A CN 103185337 A CN103185337 A CN 103185337A CN 2013101137914 A CN2013101137914 A CN 2013101137914A CN 201310113791 A CN201310113791 A CN 201310113791A CN 103185337 A CN103185337 A CN 103185337A
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Abstract
The invention provides an anti-abrasion and attrition-reducible circulating fluidized bed boiler. The circulating fluidized bed boiler comprises a plurality of water wall tubes for forming a furnace water wall, wherein a plurality of horizontal flow blocking beams perpendicular to the water wall tubes in the length direction are arranged on the water wall; the positions of the horizontal flow blocking beams on the water wall meets an exponential formula that a<n+1>-(L+1)*a+L is equal to U; the value of the a can be obtained by using a mathematical Newton secant method; the root of a being equal to 1 is omitted to obtain a first horizontal flow blocking beam; the distance between the first horizontal flow blocking beam and an anti-abrasion plastic upper edge of a dense-phase zone is a; the distance between a second horizontal flow blocking beam and the first horizontal flow blocking beam is a<2>; and so on, the distance between a nth horizontal flow blocking beam and a (n-1)th horizontal flow blocking beam is a<n>. According to the invention, the horizontal flow blocking beams are arranged in the boiler, do not obviously affect rated operating parameter of the boiler, can effectively reduce abrasion of grains on the water wall tubes, and can reduce abrasion effect of swirl, turbulence, swirl flow, angle gather and the like, and can realize an excellent protective effect on the whole inner wall of the boiler.
Description
Technical field
The present invention relates to a kind of CFBB of abrasionproof anti-attrition, belong to CFBB abrasionproof anti-attrition technical field.
Background technology
Utilize flowing of solid phase and gas phase two-phase, make solid material constantly boiling expansion under wind action of burner hearth internal combustion, it is collected that the some of them particle is arranged on the gas-solid separating device of furnace outlet, and send the burning that burner hearth circulates repeatedly back to by material-returning device, the boiler of this burn cycle process is referred to as CFBB.CFBB with respect to conventional boiler have that fuel tolerance is wide, advantage such as sufficient combustion, gas emissions such as load regulation range is big, governing speed is fast, ash comprehensive utilization rate height, sulfur dioxide and nitrogen oxide are lower, therefore, has bright development prospect.
But in the use of CFBB, because the intrinsic fluidized combustion form of CFBB, make inevitably to have the problem of pressure-containing member serious wear in the boiler, thereby cause the wall pipe attenuate in the burner hearth, and then cause potential safety hazard.And cause the main cause of the wall pipe wearing and tearing in the burner hearth to have: 1) Ran Shao solid particle has the field of flow that nucleolus distributes in burner hearth, and the part particle is for pasting the tube wall motion, and particle flush water cold wall pipe causes wearing and tearing; 2) particle of adherent pipe motion is when running into water-cooling wall surface protuberance (as soldered, crator etc.), can produce local " eddy current " and " tributary stack " effect nearby, on the water screen tube of the about 45 ° of directions in ridge both sides " planing " go out zanjon, very easily cause the water screen tube explosion; 3) the high concentration ash-laden gas of emulsion zone pouring material and water-cooling wall transition region forms local " eddy current ", " turbulent flow " and " swirling flow " owing to cross-section relation changes, water screen tube is produced the cutting abrasion of severe impact formula, cause this regions wear especially severe, booster takes place often; 4) water-cooled screen and cross zone such as heat shielding because furnace cross-sectional area changes and causes the velocity of flue gas change also to cause inordinate wear easily; 5) angle makes bight water screen tube wearing and tearing obviously greater than other position owing to there is grain flow " Ji Jiao " effect all around; 6) the furnace outlet zone often causes near the water screen tube side wear of outlet because the flue gas bias current causes particle poly-partially.
Chinese patent literature CN201680361U discloses the shoe of boiler hearth of circulating fluidized bed dilute-phase zone, comprise the abrasionproof step that is arranged at several grades of annulars on the burner hearth dilute-phase zone sidewall, every grade of abrasionproof step comprises the bitch that is fixedly arranged on the furnace wall cooling, and is laid in the outer flame retardant coating of bitch.Spacing between the adjacent two abrasionproof steps reduces from top to bottom successively.Two adjacent water screen tubes are laid with the arc flame retardant coating concordant with its inside tube outer rim in four corners of burner hearth dilute-phase zone.The principal element that influences the inboard wall of burner hearth erosive wear is abrasive grain speed, wear particle concentration and abrasive particle diameter.The shoe of above-mentioned boiler hearth of circulating fluidized bed dilute-phase zone, by the abrasionproof step is set the solid particle movement velocity of adherent motion is reduced, reach the effect that reduces to wear and tear, and on the corner lay the arc flame retardant coating on adjacent two water screen tubes, weakened the wearing and tearing of " Ji Jiao " effect to the inwall bight to a certain extent.
Above-mentioned shoe is by arranging multi-stage annular abrasionproof step at the burner hearth dilute-phase zone, and the arrangement that the spacing between the adjacent two abrasionproof steps reduces from top to bottom successively reaches the abrasionproof effect.
And Chinese patent literature CN201382411Y further discloses a kind of choked flow frame, particularly a kind of index choked flow frame for the circulating fluidized bed boiler water-cooling wall anti-attrition.It comprises some water screen tubes and fin, connected by fin between each adjacent water screen tube, wall at water screen tube and fin is provided with the horizontally disposed or vertically arranged choked flow beam of several groups, be provided with several bitch in the beam body of each choked flow beam, bitch the inner is welded on the fin along choked flow beam arranged direction.To its objective is in order designing and a kind ofly can significantly to reduce sticking wall flow speed, effectively stop and alleviate bed material and flying dust to the index choked flow frame of water screen tube wearing and tearing.Compare with existent technique, wear rate decline 50-80%, choked flow beam firm supporting can not cause tangible influence to bed temperature, can not influence vapor (steam) temperature and exhaust gas temperature yet; Can be used with sprayed coating, forming furnace body does not have abrasive effect.
Above-mentioned choked flow frame not only further discloses the index of coincidence rule distribution principle of arranging of horizontal choked flow beam with respect to above-mentioned shoe, but also the setting of vertical local choked flow beam is disclosed, make that the abrasionproof effect of choked flow frame is better significantly, but still there are the following problems: 1) the anti-wear effect of choked flow beam mainly is that speed and the direction that changes the mill particle flux that boiler inner close fitting water-cooling wall washes away reduces the mill particle flux to the wearing and tearing of water-cooling wall in the boiler, because on the interior water-cooling wall of boiler, mill particle flux concentration and the speed of following direction are different, therefore, the density degree of the choked flow beam that the water-cooling wall upper-lower position arranges in boiler is also inconsistent, follow thin close index arrangement principle down and only disclose the horizontal choked flow beam in the shoe in the prior art, vertical local choked flow beam arranges spacing as required, road number and length; Do not have on the clear and definite horizontal choked flow beam and to dredge close density degree down, and the particular location of horizontal choked flow beam and vertical beam water-cooling wall in boiler, and density degree and the particular location heat supply and the abrasionproof that are related to boiler of choked flow beam in boiler.The horizontal choked flow beam that arranges in the boiler is crossed the heating effect that secret meeting influences boiler; And arranged rarely, and do not reach abrasionproof effect preferably again, therefore, the concrete distribution of choked flow beam is extremely important to the performance of boiler; 2) the prior art changes the not solution of wear problem that causes to each regional sectional area of part " eddy current ", " tributary stack " effect and burner hearth of water-cooling wall surface protuberance (as soldered, crator etc.).
Summary of the invention
For this reason, technical problem to be solved by this invention is that the method for arranging of abrasionproof anti-attrition device of CFBB of abrasionproof anti-attrition in the prior art is generally unclear, be unfavorable for being implemented in and reach best abrasionproof effect when not influencing the boiler heat supplying performance, in addition, can not solve the wear problem at ridge places such as soldered, can't all carry out favorable protection to the various piece of boiler inner wall, and then a kind of easy operating is provided, can well take into account the wearing and tearing at ridge places such as soldered, whole boiler inner wall can both be realized the CFBB of the abrasionproof anti-attrition of good protection.
For solving the problems of the technologies described above, the CFBB of abrasionproof anti-attrition of the present invention, the water screen tube that comprises some formation furnace wall coolings, be provided with several horizontal choked flow beam vertical with described water screen tube length direction on the described water-cooling wall from bottom to top, exponential formula a is satisfied in the position of described horizontal choked flow beam on described water-cooling wall
N+1-(L+1) a+L=0, wherein, described a is the truth of a matter, and described n is the road number of described horizontal choked flow beam, and described L is the distance of emulsion zone corrosive-proof plastic material upper edge to furnace outlet lower edge;
Try to achieve a value with mathematics newton secant method, cast out the root of a=1, obtaining the horizontal choked flow beam in first road is a from the distance of described emulsion zone corrosive-proof plastic material upper edge; The horizontal choked flow beam in second road is a from the distance of the horizontal choked flow beam in first road
2The horizontal choked flow beam in the 3rd road is a from the distance of the horizontal choked flow beam in described second road
3The rest may be inferred, and the distance of the horizontal choked flow beam in n road and the horizontal choked flow beam in n-1 road is a
n
Preferably, during L≤10 meter, n gets 3～5 roads; During 10＜L≤15 meter, n gets 4～6 roads; During 15＜L≤20 meter, n gets 5～7 roads; During 20＜L≤25 meter, n gets 6～8 roads; During L＞25 meter, n gets 7～9 roads.
Further preferably, during L≤10 meter, n gets 4 roads; During 10＜L≤15 meter, n gets 5 roads; During 15＜L≤20 meter, n gets 6 roads; During 20＜L≤25 meter, n gets 7 roads; During L＞25 meter, n gets 8 roads.
The position of described horizontal choked flow beam on described water-cooling wall can be finely tuned up or down, its fine setting rule satisfies: 1m is moved or moves down than the normal place that draws by exponential formula in the position of the horizontal choked flow beam in n road whenever, and the D size of the horizontal choked flow beam in described n road will increase or reduce 10 millimeters, the D size of the horizontal choked flow beam in n+1 road will reduce or increase 10 millimeters.
Described D is of a size of parallel with described water-cooling wall, and with the distance away from described water-cooling wall one end surfaces of the tangent plane of described water screen tube to described horizontal choked flow beam.
Described D size satisfies: during the rated capacity of CFBB≤130t/h, D gets 40～45 millimeters; When evaporation capacity was 130～410t/h, D got 45～55 millimeters; During evaporation capacity 〉=670t/h, D gets 50～65 millimeters.
Described horizontal choked flow beam is in the part at place, burner hearth corner by the transition of arc section choked flow section.
Described circular arc choked flow section respectively covers 3～5 of described water screen tubes in both sides centered by the vertical intersection at place, burner hearth corner.
Described circular arc choked flow section upper end also forms a slope, and described slope is formed to the same point gathering on the described intersection by the each point on the described circular arc choked flow section.
Described arc radius R is 100～150 millimeters, and described slope is 60～120 millimeters with respect to the height H of described circular arc choked flow section upper end.
Also be provided with several vertical local choked flow beam that arranges along described water screen tube length direction on the described water-cooling wall and/or several is along the local choked flow beam of the level that arranges perpendicular to described water-cooling wall length direction, wherein said vertical local choked flow beam is arranged on level than the air blast place, and the local choked flow beam of described level is arranged on vertically than the air blast place.
The crosscut cross section of described vertical local choked flow beam is trapezoidal, and described trapezoidal long base embeds in the described water-cooling wall.
Be 45～75 ° of angles between described trapezoidal two waists and described first base.
Described vertical local choked flow beam is provided with twice, divides the described water-cooling wall center that occupy the stockhole both sides.
Described vertical local choked flow beam is in the highest described horizontal choked flow beam top, position in the described burner hearth.
Water-cooled in the described burner hearth is shielded, also is respectively equipped with the screen horizontal choked flow beam consistent with described horizontal choked flow beam layout rule on the heat shielding outer wall excessively.
The horizontal choked flow beam of described screen is provided with 2 to 3 roads.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) CFBB of abrasionproof anti-attrition of the present invention is tried to achieve exponential formula a with mathematics newton secant method
N+1-(L+1) a value among the a+L=0 is set to a, a respectively with the spacing between the horizontal choked flow beam
2, a
3The rest may be inferred, clear and definite each described horizontal choked flow beam arranges the rule of position at described water-cooling wall, show through the multiple authentication experimental result, the boiler that obtains according to the position distribution rule of the CFBB of abrasionproof anti-attrition of the present invention, can when reaching abrasionproof effect preferably, not influence the heating effect of boiler, realized when the horizontal choked flow beam of same road number is set, reaching best abrasionproof effect.
(2) CFBB of abrasionproof anti-attrition of the present invention, the value relation between the n is counted in the road that further defines the distance L of emulsion zone corrosive-proof plastic material upper edge to furnace outlet lower edge and described horizontal choked flow beam, obtained in the boiler of different size specification, the optimum value of the road number of described horizontal choked flow beam is set, has guaranteed that the position distribution rule of using the CFBB of abrasionproof anti-attrition of the present invention in the boiler of different size specification can both obtain best abrasionproof effect.
(3) in the CFBB of abrasionproof anti-attrition of the present invention, the position of horizontal choked flow beam arranges according to the weld seam in the boiler, water-cooled screen, heat shielding, refractory material equipotential install situation excessively, further carry out the cooperation fine setting on horizontal choked flow beam present position and the D size again, the abrasionproof that heat shielding, refractory material etc. are located is shielded, crossed to weld seam, the water-cooled that can take into account in the boiler, can avoid above-mentioned position wearing and tearing to occur, boiler is played the effect of abrasionproof anti-attrition more fully.
(4) CFBB of abrasionproof anti-attrition of the present invention, further define the value relation of the rated capacity of the D size of horizontal choked flow beam and CFBB, make the CFBB of abrasionproof anti-attrition of the present invention applicable to the CFBB of different evaporation capacity, and reach good abrasionproof antifriction effect.
(5) CFBB of abrasionproof anti-attrition of the present invention, horizontal choked flow beam is in the part at burner hearth corner place by the transition of arc section choked flow section, and arc section choked flow section can prevent because the water screen tube of the angle part wearing and tearing that exist grain flow " Ji Jiao " effect to cause all around.
(6) CFBB of abrasionproof anti-attrition of the present invention, special according to the wind direction at some position in the burner hearth, as the stockhole both sides, on the described water-cooling wall of these privileged sites, also be provided with the local choked flow beam of several vertical local choked flow beam and/or level.The local choked flow beam of described vertical local choked flow beam and level is arranged on water-cooling wall serious wear place, the abrasive particle travel direction of this position is changed and the speed reduction, guarantee that further CFBB of the present invention can both realize good protection to whole boiler inner wall.
(7) CFBB of abrasionproof anti-attrition of the present invention, described vertical local choked flow beam is provided with twice, divides the described water-cooling wall center that occupy the stockhole both sides.The furnace outlet zone often causes near the water screen tube side wear of outlet because the flue gas bias current causes particle poly-partially, at the described water-cooling wall center of stockhole both sides vertical local choked flow beam is set and can strengthens this regional abrasionproof antifriction effect.
(8) CFBB of abrasionproof anti-attrition of the present invention, the interior water-cooled of described burner hearth shield, cross also to be respectively equipped with on the heat shielding outer wall with described horizontal choked flow beam arranges the horizontal choked flow beam of screen that rule is consistent.Because there is the variation of furnace cross-sectional area in zones such as water-cooled screen, mistake heat shielding, cause inordinate wear easily, arranging of the horizontal choked flow beam of screen can be played good protective action to this part.
(9) in the present invention, described horizontal choked flow beam is in the part at place, burner hearth corner by the transition of arc section choked flow section, and this circular arc choked flow section upper end also forms a slope, arc section choked flow section and ramp structure be equipped with the abrasive particle " collection corner effect " that can eliminate the boiler corner.
Description of drawings
Content of the present invention is easier clearly to be understood in order to make, and below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the perspective view that the CFBB of abrasionproof anti-attrition device of the present invention is installed;
Fig. 2 is the partial sectional view of the side-looking direction of Fig. 1;
Fig. 3 is the cutaway view of the A direction of Fig. 1;
Fig. 4 is the cutaway view of circular arc choked flow section;
Fig. 5 is the schematic diagram of the B direction of Fig. 4;
Fig. 6 is the partial sectional view of Fig. 5;
Reference numeral is expressed as among the figure: the 1-water-cooling wall; The 11-water screen tube; The horizontal choked flow beam of 2-; The horizontal choked flow beam in 21-first road; The horizontal choked flow beam in 22-second road; The horizontal choked flow beam in 23-the 3rd road; 3-shields horizontal choked flow beam; 4-emulsion zone corrosive-proof plastic material upper edge; 4 '-corrosive-proof plastic material upper edge; The 5-furnace outlet; 6-circular arc choked flow section; The vertical local choked flow beam of 7-; Heat shielding is shielded, crossed to the 8-water-cooled; The 9-soldered; The E-intersection; The distance of L-emulsion zone corrosive-proof plastic material upper edge to furnace outlet lower edge; L
1The distance of the horizontal choked flow beam in road ,-emulsion zone corrosive-proof plastic material upper edge to the first; L
2The horizontal choked flow beam in-the second road is from the distance of the horizontal choked flow beam in first road; L
3The horizontal choked flow beam in-Di three roads is from the distance of the horizontal choked flow beam in described second road; D-parallel with water-cooling wall and with the distance away from water-cooling wall one end surfaces of the tangent plane of water screen tube to horizontal choked flow beam; The H-slope is with respect to the height of circular arc choked flow section upper end.
The specific embodiment
Below with reference to accompanying drawing, use following examples that the present invention is further set forth.
As shown in Figure 1, the CFBB of the described abrasionproof anti-attrition of present embodiment, the water screen tube 11 that comprises some formation furnace wall coolings 1, be provided with several horizontal choked flow beam 2 vertical with described water screen tube 11 length directions on the described water-cooling wall 1 from bottom to top, exponential formula a is satisfied in the position of described horizontal choked flow beam 2 on described water-cooling wall 1
N+1-(L+1) a+L=0, wherein, described a is the truth of a matter, and described n is the road number of described horizontal choked flow beam 2, and described L is the distance of emulsion zone corrosive-proof plastic material upper edge 4 to furnace outlet 5 lower edges.
In the present embodiment, emulsion zone corrosive-proof plastic material upper edge to the distance L of furnace outlet lower edge of CFBB is got 18 meters, and the road of described horizontal choked flow beam is counted n and got 6 roads, according to exponential formula a
N+1-(L+1) a+L=0, the root of trying to achieve a value with mathematics newton secant method is a=1.326 and a=1, casts out the root of a=1, obtaining the horizontal choked flow beam 21 in first road is a from the distance of described emulsion zone corrosive-proof plastic material upper edge 4, namely 1.326 meters; The horizontal choked flow beam 22 in second road is a from the distance of the horizontal choked flow beam 21 in first road
2, namely 1.758 meters; The horizontal choked flow beam 23 in the 3rd road is a from the distance of the horizontal choked flow beam 22 in described second road
3, namely 2.331 meters; The distance of the horizontal choked flow beam in the 4th road and the horizontal choked flow beam 23 in the 3rd road is a
4, namely 3.092 meters; The distance of the horizontal choked flow beam in the 5th road and the horizontal choked flow beam in the 4th road is a
5, namely 4.099 meters; The distance of the horizontal choked flow beam in the 6th road and the horizontal choked flow beam in the 5th road is a
6, namely 5.436 meters.
Need to prove that in the boiler of different size specification, the value of L and n is not unique, when including but not limited to following scope: L≤10 meter, n gets 3～5 roads; During 10＜L≤15 meter, n gets 4～6 roads; During 15＜L≤20 meter, n gets 5～7 roads; During 20＜L≤25 meter, n gets 6～8 roads; During L＞25 meter, n gets 7～9 roads.Above-mentioned value relation only provides a kind of more excellent design, and can further be preferably: during L≤10 meter, n gets 4 roads; During 10＜L≤15 meter, n gets 5 roads; During 15＜L≤20 meter, n gets 6 roads; During 20＜L≤25 meter, n gets 7 roads; During L＞25 meter, n gets 8 roads.
Same, the CFBB of different size has different rated capacities, for realizing purpose of the present invention, the size value of the rated capacity of CFBB and horizontal choked flow beam 2 is not unique yet, include but not limited to following scope: during the rated capacity of CFBB≤130t/h, D gets 40～45 millimeters; When evaporation capacity was 130～410t/h, D got 45～55 millimeters; During evaporation capacity 〉=670t/h, D gets 50～65 millimeters.Wherein, described D is of a size of parallel with described water-cooling wall 1, and with the distance away from described water-cooling wall one end surfaces of the tangent plane of described water screen tube 11 to described horizontal choked flow beam.Arbitrary value in the desirable above-mentioned scope of the dimension D of the rated capacity of CFBB and horizontal choked flow beam 2, in the present embodiment, the rated capacity of CFBB is 410t/h, the D size of described horizontal choked flow beam 2 is got 50 millimeters.
The position of horizontal choked flow beam arranges according to the weld seam in the boiler, water-cooled screen, heat shielding, refractory material equipotential install situation excessively, further carry out the cooperation fine setting on horizontal choked flow beam present position and the D size again, the abrasionproof that heat shielding, refractory material etc. are located is shielded, crossed to weld seam, the water-cooled that can take into account in the boiler.The position of described horizontal choked flow beam 2 on described water-cooling wall 1 can be finely tuned up or down, its fine setting rule satisfies: the position of the horizontal choked flow beam 2 in n road moves or moves down 1 meter than the normal place that draws by exponential formula whenever, and the D size of the horizontal choked flow beam 2 in described n road will increase or reduce 10 millimeters, the D size of the horizontal choked flow beam 2 in n+1 road will reduce or increase 10 millimeters.As shown in Figure 2, soldered 9 is positioned at 0.5 meter, horizontal choked flow beam 23 tops, the 3rd road, and the position of horizontal choked flow beam 23 on described water-cooling wall 1, described the 3rd road can upwards be finely tuned, according to the fine setting rule, described horizontal choked flow beam 23 is upwards finely tuned 0.5 meter, in order to cover soldered 9, the horizontal choked flow beam 21 in first road still is 1.326 meters from the distance L 1 of described emulsion zone corrosive-proof plastic material upper edge 4, the horizontal choked flow beam in second road still is 1.758 meters from the distance L 2 of the horizontal choked flow beam in first road, and the horizontal choked flow beam in the 3rd road increases by 0.5 meter from the distance L 3 of the horizontal choked flow beam in described second road, become 2.831 meters, the horizontal choked flow beam in the 4th road reduces 0.5 meter from the distance of the horizontal choked flow beam 23 in the 3rd road, 2.592 meters of displacements, the D size of the horizontal choked flow beam in described the 3rd road increases to 55 millimeters, and the D size of the horizontal choked flow beam in the 4th road is reduced to 45 millimeters.
For prevent owing to around the wearing and tearing that exist grain flow " Ji Jiao " effect to cause of the water screen tube of angle part, horizontal choked flow beam 2 is in the part at place, burner hearth corner by 6 transition of arc section choked flow section, shown in Fig. 4-6, need to prove, for realizing purpose of the present invention, the design of described circular arc choked flow section 6 is not unique, in the present embodiment, a kind of concrete design is provided, it is 3～5 that described circular arc choked flow section 6 both sides centered by the vertical intersection E at place, burner hearth corner respectively cover described water screen tube 11, in the present embodiment, further be specially 4.Same, described arc radius R is not unique yet, includes but not limited to 100～150 millimeters, in the present embodiment, provides preferred embodiment a kind of, and described arc radius R is 150 millimeters.Described circular arc choked flow section 6 upper ends also form a slope, and described slope is formed to the same point gathering on the described intersection E by the each point on the described circular arc choked flow section 6.Certainly, described slope is not unique with respect to the height H of described circular arc choked flow section 6 upper ends yet, the arbitrary value in desirable 60～120 millimeters, and in the present embodiment, described slope is got 100 millimeters with respect to the height H of described circular arc choked flow section 6 upper ends.
For abrasionproof and the antifriction effect of strengthening frayed serious part, also be provided with vertical local choked flow beam 7 and the level part choked flow beam of several edge perpendicular to described water-cooling wall 11 length directions setting that several arranges along described water screen tube 11 length directions on the described water-cooling wall 1, wherein said vertical local choked flow beam 7 is arranged on level than the air blast place, and the local choked flow beam of described level is arranged on vertically than the air blast place.Need to prove, the set-up mode of described vertical local choked flow beam 7 is not unique, and present embodiment provides a kind of concrete implementation, as shown in Figure 3, the crosscut cross section of described vertical local choked flow beam 7 is trapezoidal, and described trapezoidal long base embeds in the described water-cooling wall 1.For realizing purpose of the present invention, angle between described trapezoidal two waists and described first base is not unique, present embodiment provides more preferably span, be 45～75 ° of angles between described trapezoidal two waists and described first base, in the present embodiment, the angle between described trapezoidal two waists and described first base is got 60 °.
For solving the furnace outlet zone because the flue gas bias current causes particle poly-partially, easily cause near the problem of the water screen tube side wear of outlet, described vertical local choked flow beam 7 is provided with twice, divides described water-cooling wall 1 center that occupy the stockhole both sides.Described vertical local choked flow beam 7 can be arranged on and be in the highest described horizontal choked flow beam top, position in the described burner hearth, and namely when described horizontal choked flow beam was provided with six roads, described vertical local choked flow beam 7 was in horizontal choked flow beam top, described the 6th road.
For avoiding water-cooled screen, cross the inordinate wear that zone such as heat shielding exists the variation of furnace cross-sectional area to cause, the water-cooled screen in the described burner hearth, cross and also be respectively equipped with the screen horizontal choked flow beam 3 consistent with described horizontal choked flow beam 2 layout rules on heat shielding 8 outer walls.Certainly, the road number that the horizontal choked flow beam 3 of described screen arranges is not unique, and in the present embodiment, the horizontal choked flow beam 3 of described screen is provided with 2 roads, and the distance that first road shields horizontal choked flow beam and corrosive-proof plastic material upper edge 4 ' is 1.326 meters; The distance of the horizontal choked flow beam of the second road screen and the horizontal choked flow beam of the first road screen is 1.758 meters.
The implementation result contrast
The special-purpose flow field calculating analysis software that utilization contains the Finite Element Method of viscoelastic structure carries out analog computation to the flow field of each phase region in the recirculating fluidized bed, obtains the fluidal texture of gas and particle; Adopt the overall Mathematical Modeling of recirculating fluidized bed that the furnace heat transfer state is calculated simultaneously, verify by analog computation result and practical effect.
(1) abrasionproof antifriction effect contrast:
The decrease speed of boiler furnace limit wall descender particle (bed material and flying dust) is installed maximal rate before the abrasionproof anti-attrition structure from 7m/s() drop to 2m/s(maximal rate after the abrasionproof anti-attrition structure is installed);
Before the granule density of dilute-phase zone is installed before the abrasionproof anti-attrition structure from 30kg/m3() be down to before and after the 10kg/m3(installation abrasionproof anti-attrition structure).
Pipe thickness attenuate amount: operation is 1 year under boiler rated load and design coal service condition, 1000 points of random inspection on water-cooling wall pipe of burner hearth, after testing, before boiler of the present invention is installed abrasionproof anti-attrition structure, 100% selective examination point water screen tube wall thickness reduction amount≤0.6 millimeter, 80% selective examination point water screen tube wall thickness reduction amount is≤0.5 millimeter.Usually can reach 0.3 millimeter of 100% selective examination point water screen tube wall thickness reduction amount, 80% selective examination point water screen tube wall thickness reduction amount is 0.2 millimeter.Compare for 3 to 5 millimeters with the annual attenuate amount of boiler of the prior art, abrasive particle significantly alleviates the wearing and tearing of water screen tube as can be known, and effects such as " eddy current ", " turbulent flow ", " swirling flow ", " Ji Jiao ", " bias current " also obviously weaken.
(2) among the present invention the choked flow beam of abrasionproof anti-attrition to the influence of boiler
The declared working condition operational factor situation of change of abrasionproof anti-attrition device boiler of the present invention: the load no change, the burner hearth differential pressure changes≤1%, and primary air flow changes≤3%, total blast volume changes≤3%, the vapor (steam) temperature no change, the burner hearth bed temperature changes≤12 ℃, and exhaust gas temperature changes≤3 ℃.
Conclusion
The CFBB of abrasionproof anti-attrition of the present invention, the movement velocity of the particle that glides along water-cooling wall has obviously slowed down in the boiler, reduced along the concentration of water-cooling wall downslide particle by changing particle motion, thereby alleviated the erosive wear of particle to water screen tube, weakened effects such as " eddy current ", " turbulent flow ", " swirling flow ", " Ji Jiao ", " bias current ", and less to the heating performance influence of boiler.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are among the protection domain of the invention.
Claims (16)
1. the CFBB of an abrasionproof anti-attrition, the water screen tube (11) that comprises some formation furnace wall coolings (1), be provided with several horizontal choked flow beam (2) vertical with described water screen tube (11) length direction on the described water-cooling wall (1) from bottom to top, it is characterized in that exponential formula a is satisfied in the position of described horizontal choked flow beam (2) on described water-cooling wall (1)
N+1-(L+1) a+L=0, wherein, described a is the truth of a matter, and described n is the road number of described horizontal choked flow beam (2), and described L is that emulsion zone corrosive-proof plastic material upper edge (4) is to the distance of furnace outlet (5) lower edge;
Try to achieve a value with mathematics newton secant method, cast out the root of a=1, obtaining the horizontal choked flow beam in first road (21) is a from the distance of described emulsion zone corrosive-proof plastic material upper edge (4); The distance of the horizontal choked flow beam in second road (22) horizontal choked flow beam (21) from first road is a
2The horizontal choked flow beam in the 3rd road (23) is a from the distance of the horizontal choked flow beam in described second road (22)
3The rest may be inferred, and the distance of the horizontal choked flow beam in n road and the horizontal choked flow beam in n-1 road is a
n
2. the CFBB of abrasionproof anti-attrition according to claim 1 is characterized in that, during L≤10 meter, n gets 3～5 roads; During 10＜L≤15 meter, n gets 4～6 roads; During 15＜L≤20 meter, n gets 5～7 roads; During 20＜L≤25 meter, n gets 6～8 roads; During L＞25 meter, n gets 7～9 roads.
3. the CFBB of abrasionproof anti-attrition according to claim 2 is characterized in that, during L≤10 meter, n gets 4 roads; During 10＜L≤15 meter, n gets 5 roads; During 15＜L≤20 meter, n gets 6 roads; During 20＜L≤25 meter, n gets 7 roads; During L＞25 meter, n gets 8 roads.
4. the CFBB of abrasionproof anti-attrition according to claim 1 is characterized in that, the position of described horizontal choked flow beam (2) on described water-cooling wall (1) can be finely tuned up or down, and its fine setting rule satisfies:
1m is moved or moves down than the normal place that draws by exponential formula in the position of the horizontal choked flow beam in n road (2) whenever, the D size of the horizontal choked flow beam in described n road (2) will increase or reduce 10 millimeters, the D size of the horizontal choked flow beam in n+1 road (2) will reduce or increase 10 millimeters;
Described D is of a size of parallel with described water-cooling wall (1), and with the distance away from described water-cooling wall one end surfaces of the tangent plane of described water screen tube (11) to described horizontal choked flow beam.
5. the CFBB of abrasionproof anti-attrition according to claim 4 is characterized in that, described D size satisfies: during the rated capacity of CFBB≤130t/h, D gets 40～45 millimeters; When evaporation capacity was 130～410t/h, D got 45～55 millimeters; During evaporation capacity 〉=670t/h, D gets 50～65 millimeters.
6. the CFBB of abrasionproof anti-attrition according to claim 1 is characterized in that, described horizontal choked flow beam (2) is in the part at place, burner hearth corner by arc section choked flow section (6) transition.
7. the CFBB of abrasionproof anti-attrition according to claim 6 is characterized in that: described circular arc choked flow section (6) respectively covers (11) 3～5 of described water screen tubes in both sides centered by the vertical intersection (E) at place, burner hearth corner.
8. the CFBB of abrasionproof anti-attrition according to claim 7, it is characterized in that: described circular arc choked flow section (6) upper end also forms a slope, and described slope is formed to the same point gathering on the described intersection (E) by the each point on the described circular arc choked flow section (6).
9. the CFBB of abrasionproof anti-attrition according to claim 8, it is characterized in that: described arc radius R is 100～150 millimeters, described slope is 60～120 millimeters with respect to the height H of described circular arc choked flow section (6) upper end.
10. according to the CFBB of each described abrasionproof anti-attrition among the claim 1-9, it is characterized in that: also be provided with several vertical local choked flow beam (7) that arranges along described water screen tube (11) length direction on the described water-cooling wall (1) and/or several is along the local choked flow beam of the level that arranges perpendicular to described water-cooling wall (11) length direction, wherein said vertical local choked flow beam (7) is arranged on level than the air blast place, and the local choked flow beam of described level is arranged on vertically than the air blast place.
11. the CFBB of abrasionproof anti-attrition according to claim 10 is characterized in that: the crosscut cross section of described vertical local choked flow beam (7) is trapezoidal, and described trapezoidal long base embeds in the described water-cooling wall (1).
12. the CFBB of abrasionproof anti-attrition according to claim 11 is characterized in that: be 45～75 ° of angles between described trapezoidal two waists and described first base.
13. the CFBB of abrasionproof anti-attrition according to claim 10 is characterized in that: described vertical local choked flow beam (7) is provided with twice, divides described water-cooling wall (1) center that occupy the stockhole both sides.
14. the CFBB of abrasionproof anti-attrition according to claim 13 is characterized in that: described vertical local choked flow beam (7) is in the highest described horizontal choked flow beam top, position in the described burner hearth.
15. the CFBB of abrasionproof anti-attrition according to claim 1 is characterized in that: the water-cooled in the described burner hearth is shielded, also is respectively equipped with the screen horizontal choked flow beam (3) consistent with described horizontal choked flow beam (2) layout rule on heat shielding (8) outer wall excessively.
16. the CFBB of abrasionproof anti-attrition according to claim 15 is characterized in that: the horizontal choked flow beam of described screen (3) is provided with 2 to 3 roads.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782961A (en) * | 2016-05-10 | 2016-07-20 | 北京亚高科能源科技有限公司 | Tail shaft circulating fluidized bed heat conducting oil boiler with abrasion resistant structure |
| CN106051753A (en) * | 2016-07-16 | 2016-10-26 | 广东粤电湛江生物质发电有限公司 | Internally-circulating flowing choking and buffering type biomass circulating fluidized bed |
| CN106224946A (en) * | 2016-09-18 | 2016-12-14 | 广西秀美壮乡能源环保有限公司 | A kind of wear-resistance circulation fluidized bed boiler |
| CN106257370A (en) * | 2015-06-19 | 2016-12-28 | 株式会社Posco | Flow control device and bias current control method partially |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6454116A (en) * | 1987-08-26 | 1989-03-01 | Babcock Hitachi Kk | Furnace wall tube wear preventing device |
| JPH08178212A (en) * | 1994-12-28 | 1996-07-12 | Ishikawajima Harima Heavy Ind Co Ltd | Structure of furnace wall of fluidized-bed boiler |
| CN2854351Y (en) * | 2005-08-31 | 2007-01-03 | 西安热工研究院有限公司 | Firepot of circulation fluidized bed boiler with anti-wear device |
| CN101566341A (en) * | 2009-05-21 | 2009-10-28 | 刘少光 | Exponential flow-resisting frame used for reducing abrasion of circulating fluidized bed boiler water-cooling wall |
| CN203162935U (en) * | 2013-04-02 | 2013-08-28 | 刘少光 | Anti-abrasion anti-attrition circulating fluid bed boiler |
-
2013
- 2013-04-02 CN CN201310113791.4A patent/CN103185337B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6454116A (en) * | 1987-08-26 | 1989-03-01 | Babcock Hitachi Kk | Furnace wall tube wear preventing device |
| JPH08178212A (en) * | 1994-12-28 | 1996-07-12 | Ishikawajima Harima Heavy Ind Co Ltd | Structure of furnace wall of fluidized-bed boiler |
| CN2854351Y (en) * | 2005-08-31 | 2007-01-03 | 西安热工研究院有限公司 | Firepot of circulation fluidized bed boiler with anti-wear device |
| CN101566341A (en) * | 2009-05-21 | 2009-10-28 | 刘少光 | Exponential flow-resisting frame used for reducing abrasion of circulating fluidized bed boiler water-cooling wall |
| CN203162935U (en) * | 2013-04-02 | 2013-08-28 | 刘少光 | Anti-abrasion anti-attrition circulating fluid bed boiler |
Non-Patent Citations (1)
| Title |
|---|
| 夏云飞等: "600MW循环流化床锅炉水冷壁设置防磨梁后炉内气固流场的数值研究", 《动力工程学报》, vol. 33, no. 2, 28 February 2013 (2013-02-28) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257370A (en) * | 2015-06-19 | 2016-12-28 | 株式会社Posco | Flow control device and bias current control method partially |
| CN105782961A (en) * | 2016-05-10 | 2016-07-20 | 北京亚高科能源科技有限公司 | Tail shaft circulating fluidized bed heat conducting oil boiler with abrasion resistant structure |
| CN106051753A (en) * | 2016-07-16 | 2016-10-26 | 广东粤电湛江生物质发电有限公司 | Internally-circulating flowing choking and buffering type biomass circulating fluidized bed |
| CN106224946A (en) * | 2016-09-18 | 2016-12-14 | 广西秀美壮乡能源环保有限公司 | A kind of wear-resistance circulation fluidized bed boiler |
| CN106224946B (en) * | 2016-09-18 | 2018-10-30 | 广西秀美壮乡能源环保有限公司 | A kind of wear-resistance circulation fluidized bed boiler |
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