CN111911918A - Circulating fluidized bed boiler with four parallel separators and arrangement method thereof - Google Patents
Circulating fluidized bed boiler with four parallel separators and arrangement method thereof Download PDFInfo
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- CN111911918A CN111911918A CN202010902613.XA CN202010902613A CN111911918A CN 111911918 A CN111911918 A CN 111911918A CN 202010902613 A CN202010902613 A CN 202010902613A CN 111911918 A CN111911918 A CN 111911918A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a circulating fluidized bed boiler with four parallel separators, which comprises a hearth and four cyclone separators, wherein the four cyclone separators are arranged in the hearth; the hearth comprises a front wall, a rear wall, a left side wall and a right side wall; the cross section of the hearth is symmetrical about the central line of the front wall and the rear wall of the hearth and the central line of the left side wall and the right side wall of the hearth; the four cyclone separators are composed of an inlet flue and a cylinder body and are arranged on the rear wall of the hearth in parallel; the lengths of intersecting lines of the inlet flues of the four cyclone separators and the rear wall of the hearth are equal. The invention also discloses a method for arranging the separator in the circulating fluidized bed boiler. The invention has the advantages that: the conventional large-scale circulating fluidized bed boiler furnace is simplified into four circulating loops by arranging the four cyclone separators in parallel at one side of the boiler, so that the system structure and the operation are simplified, and the uniformity of the circulating loops is improved; through the arrangement of the inlet flue of each cyclone separator, the flow distribution of flue gas and particles is more uniform, and the consistency of the performance of each cyclone separator is ensured.
Description
Technical Field
The invention belongs to the technical field of circulating fluidized bed boilers, and particularly relates to a circulating fluidized bed boiler with four parallel separators and an arrangement method thereof.
Background
The cyclone separator is one of the key parts of the circulating fluidized bed boiler, and is mainly used for separating a large amount of high-temperature solid materials from flue gas and sending the high-temperature solid materials back to a combustion chamber, so that efficient combustion and efficient heat transfer in a hearth are ensured. Along with the maximization and the high parameterization of circulating fluidized bed boiler, the diameter and the number of cyclone separator constantly increase, when the furnace homonymy surpassed two cyclone separator and arrange side by side, the gas-solid flow between a plurality of cyclone separator appeared the heterogeneity, and this kind of heterogeneous gas-solid flow will lead to the stove burning and the heat transfer inhomogeneous, and then arouse the inhomogeneous of furnace temperature distribution, aggravate the thermal deviation between the furnace water-cooling wall, extreme condition can arouse the water-cooling wall pipe overtemperature bursting pipe accident. Therefore, the optimized arrangement of the plurality of cyclones has become a bottleneck problem in the technical development of the large-sized circulating fluidized bed boiler.
Aiming at the problem of non-uniformity caused by the parallel arrangement of a plurality of cyclone separators of a supercritical large circulating fluidized bed boiler, the current solution method mainly comprises the following steps: (1) the arrangement mode of the cyclone separators at the outermost side of the hearth is optimized, for example, the method disclosed by Chinese invention patents CN201510217373.9 and CN201510219894.8, and the arrangement positions of the two cyclone separators at the outermost side of the front wall and the rear wall of the hearth are optimized, so that the gas-solid flow uniformity distribution among the three cyclone separators at the same side is realized. (2) By adopting the modular design, the method adopts a mature arrangement mode of cyclone separators with small capacity grades, and modular amplification, and because the size change of the section of a hearth is obvious, the uniformity of gas-solid flow among the cyclone separators in the method is difficult to ensure. (3) The structure and the angle of an inlet flue of a plurality of cyclone separators are adjusted and optimized, for example, the Chinese patent application No. CN201010162777.X discloses a parallel arrangement technology of cyclone separators which are symmetrical about the center point of a hearth on two sides of the hearth, so as to solve the problem of non-uniformity caused by arrangement of the cyclone separators. (4) To the ultra supercritical boiler of the higher parameter of bigger capacity, like 1000MW grade ultra supercritical circulating fluidized bed boiler, adopt a plurality of cyclone of furnace bilateral symmetry arrangement to improve gas-solid flow homogeneity, like chinese utility model patent 201620647494.7 discloses a 1000MW grade ultra supercritical parameter circulating fluidized bed boiler, improve furnace's flow homogeneity through eight cyclone of furnace bilateral symmetry arrangement, this method is though eight cyclone symmetrically arranged, but separator export afterbody flue structure can't realize the symmetry, because the mismatching of a plurality of flue resistances, so gas-solid flow homogeneity is difficult to guarantee.
In summary, the current arrangement method of the cyclone separator in the circulating fluidized bed has the following technical defects:
(1) when three cyclone separators are arranged on one side of the hearth, the tail flue structure is asymmetric, so that the influence on the gas-solid flow uniformity of the hearth is large, and the tail flue structure needs to be specially designed;
(2) when four cyclone separators are arranged in parallel on one side of the hearth, the number of the cyclone separators on one side and the number of the circulating loops are increased, so that gas-solid flow of the four circulating loops is uneven, and the deviation between bed temperature and steam temperature is large.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a circulating fluidized bed boiler with four parallel separators and an arrangement method thereof.
In order to achieve the above object, the present invention adopts the following technical solutions:
a circulating fluidized bed boiler with four parallel separators comprises a hearth and four cyclone separators; the hearth comprises a front wall, a rear wall, a left side wall and a right side wall; the cross section of the hearth is provided with a center line of a front wall and a rear wall of the hearth and a center line of a left side wall and a right side wall of the hearth, and the cross section of the hearth is axisymmetric about the two center lines; the four cyclone separators are respectively a first cyclone separator, a second cyclone separator, a third cyclone separator and a fourth cyclone separator which are arranged on the rear wall of the hearth in parallel; the four cyclone separators are respectively composed of an inlet flue and a cylinder body; and the length of the intersecting line of the inlet flue of the fourth cyclone separator and the rear wall of the hearth is equal.
Preferably, the hearth is an annular hearth; the annular hearth comprises an inner ring and an outer ring; the outer ring surrounds the inner ring, and an annular space between the inner ring and the outer ring forms a hearth space.
Preferably, the cross section of the hearth is hexagonal; the hearth also comprises two corner cutting film type walls of a rear wall; the two pieces of corner cutting film walls are respectively a left rear corner cutting and a right rear corner cutting.
Preferably, the cross section of the hearth is octagonal; the hearth also comprises four corner cutting film walls; the four corner cutting film walls are respectively a left rear corner cut, a right rear corner cut, a left front corner cut and a right front corner cut.
Preferably, the inlet flues of the first cyclone separator and the fourth cyclone separator are the same in structure and size, and the inlet flues of the second cyclone separator and the third cyclone separator are the same in structure and size; the outer side walls of the inlet flues of the first cyclone separator and the second cyclone separator are arranged close to the central line of the front wall and the rear wall of the hearth, and the inner side walls are arranged close to the left side wall of the hearth; the third cyclone separator and the fourth cyclone separator are symmetrically arranged with the first cyclone separator and the second cyclone separator about a central line axis of the front wall and the rear wall of the hearth.
Preferably, the included angle of the outer side walls of the inlets of the first cyclone separator and the fourth cyclone separator is 60-80 degrees; the included angles of the inner side walls of the inlet flues of the second cyclone separator and the third cyclone separator are 60-80 degrees; the angle theta between the left side wall of the hearth and the left rear corner cut furnace wall is 120-150 degrees;
preferably, the included angles of the outer side walls of the inlets of the first cyclone separator and the fourth cyclone separator are equal to the included angles of the inner side walls of the flues of the inlets of the second cyclone separator and the third cyclone separator.
Preferably, the positions of the inlet flues of the first cyclone separator and the second cyclone separator satisfy the following relations:
M1N2^2×tanα＝4×(1.0～1.5)M2M3×N1X
wherein M1N2 is the distance between the point of intersection of the outer wall of the first cyclone separator and the rear wall of the hearth and the point of intersection of the inner wall of the second cyclone separator and the rear wall of the hearth, M2M3 is the distance between the point of intersection of the outer wall of the second cyclone separator and the rear wall of the hearth and the point of intersection of the outer wall of the third cyclone separator and the rear wall of the hearth, and N1X is the distance between the point of intersection of the inner wall of the first cyclone separator and the rear wall of the hearth and the two points of intersection of the front wall of the hearth and the left front corner-cut furnace wall.
Preferably, the cylinder structures and the sizes of the four cyclone separators are the same.
Preferably, the first cyclone separator, the fourth cyclone separator, the second cyclone separator and the third cyclone separator are arranged in an axisymmetrical manner around the center line of the front wall and the rear wall of the hearth; the outer side walls of the inlet flues of the first cyclone separator and the fourth cyclone separator are arranged close to the left and right side walls of the hearth, and the inner side walls of the inlet flues are arranged close to the central line of the front wall and the rear wall of the hearth; the outer side walls of the inlet flues of the second cyclone separator and the third cyclone separator are arranged close to the central line of the front wall and the rear wall of the hearth, and the inner side walls of the inlet flues of the two cyclone separators in the middle are arranged close to the left side wall and the right side wall of the hearth.
Preferably, the angles between the outer side walls of the inlet flues of the four cyclone separators and the rear wall of the hearth are 90-100 degrees; the included angle of the inner side walls of the inlet flues of the four cyclone separators is 30-60 degrees.
Preferably, the sizes of the inlet flues of the four cyclone separators and the cross sections of the hearth meet the following relationship:
M1'N1'＝(0.10～0.25)×M1'M4'
M1'M＝(0.25～0.45)×M1'M4'
the positions of the inlet flues of the first cyclone separator and the second cyclone separator satisfy the following relations:
N1'N2'-M1'M×cotα＝(1.0～1.5)×M2'M3'
wherein, M1'N1' is the distance between the intersection point of the outer wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the inner wall of the first cyclone separator and the rear wall of the hearth; n1'N2' is the distance between the intersection point of the inner wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the inner wall of the second cyclone separator and the rear wall of the hearth; m1' M is the distance between the intersection point of the outer wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the left wall of the hearth and the front wall of the hearth; m2'M3' is the distance between the intersection point of the outer wall of the second cyclone separator and the rear wall of the hearth and the intersection point of the outer wall of the third cyclone separator and the rear wall of the hearth; m1'M4' is the distance between the intersection point of the outer wall of the first cyclone and the rear wall of the hearth and the intersection point of the outer wall of the fourth cyclone and the rear wall of the hearth.
Preferably, the included angles of the outer side walls of the inlet flues of the four cyclone separators are 90-105 degrees; the included angle of the inner side wall of the inlet flue of the cyclone separator is 60-80 degrees; the angle between the left side wall of the hearth and the left rear corner cut furnace wall is 120-150 degrees.
Preferably, the positions of the inlet flues of the first cyclone separator and the second cyclone separator satisfy the following relations:
M1N2＝(1.0～1.5)×M2M3+N2M2/2×cotα
2×N1O×OA×sinθ+N1X^2×cotα＝2×M1N2×(0.8～1.2)×N1X
wherein M1N2 is the distance between the intersection point of the outer wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the inner wall of the second cyclone separator and the rear wall of the hearth; M2M3 is the distance between the intersection point of the outer wall of the second cyclone separator and the rear wall of the hearth and the distance between the intersection point of the outer wall of the third cyclone separator and the rear wall of the hearth; N2M2 is the distance between the intersection points of the inner wall and the outer wall of the second cyclone separator and the rear wall of the hearth; N1O is the distance between the intersection point of the inner side wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the rear wall of the hearth and the left rear corner-cut furnace wall; OA is the distance between the intersection point of the hearth rear wall and the left rear corner-cutting furnace wall and the intersection point of the left side wall of the hearth and the left front corner-cutting furnace wall; N1X is the distance between two points of the intersection point of the inner wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the front wall of the hearth and the left front corner-cut furnace wall.
A parallel arrangement method of four separators of a circulating fluidized bed boiler is characterized by comprising an arrangement method of four cyclone separators in the circulating fluidized bed boiler.
The invention has the advantages that:
(1) the four cyclone separators are arranged on one side of the boiler in parallel, so that six circulation loops of six cyclone separators on two sides of a hearth of a conventional large circulating fluidized bed boiler are simplified into four circulation loops under the condition of the same-capacity boiler grade, the system structure and the operation are simplified, and the nonuniformity of the circulation loops is reduced;
(2) the arrangement of the inlet flue of each cyclone separator is optimized by combining the corner cutting structure of the hearth, the particle concentration aggregation phenomenon of four corners of the traditional rectangular hearth is improved, the inlet particle concentrations of two cyclone separators at two sides of the hearth are increased, and the phenomenon that the particle concentration distribution rule of four cyclone separators at one side is high in the middle and low at two ends is improved, so that the distribution and the flow of flue gas and particles in each cyclone separator are more uniform, the particle concentration distribution on the vertical section of the inlet flue of each cyclone separator is more reasonable, and the performance consistency of each cyclone separator is ensured;
(3) through the optimized arrangement of the inlet flue of each cyclone separator, the inlet and outlet of the four cyclone separators arranged in parallel and the internal flow field are improved, so that the flue gas flow and solid particles tend to flow to the tangential edge of the inlet flue of each cyclone separator, the gas-solid separation in the cyclone separators is facilitated, and the combustion efficiency and the heat efficiency of the boiler are further improved;
(4) through the optimized arrangement of the inlet flues of the four parallel cyclone separators, the gas-solid flow distribution uniformity, the combustion uniformity of the hearth and the heat transfer uniformity among the cyclone separators are improved, the temperature deviation between the upper part and the lower part of the hearth and the thermal deviation of the heating surface of the hearth are further reduced, the risk of tube explosion of the heating surface of the hearth is further reduced, and the safe, stable and economic operation of the large circulating fluidized bed boiler is further ensured.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 3 is a schematic structural diagram of embodiment 3 of the present invention;
FIG. 4 is a schematic structural diagram of embodiment 4 of the present invention;
FIG. 5 is a schematic structural diagram of embodiment 5 of the present invention;
fig. 6 is a schematic structural diagram of embodiment 6 of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the drawings and specific examples.
Example 1
As shown in fig. 1, a circulating fluidized bed boiler in which four separators are arranged in parallel, comprises:
the hearth cross section is octagonal and comprises a front wall, a rear wall, a left side wall, a right side wall and four corner cutting film walls, the hearth cross section is provided with a hearth front and rear wall central line and a hearth left and right side wall central line, and the hearth cross section is axisymmetric about the two central lines; the left side wall OA of the hearth, the right side wall PQ of the hearth, the left rear corner cut ON1, the right rear corner cut PN4, the left front corner cut AX and the right front corner cut YQ are axisymmetric with respect to the center line of the section of the hearth vertical to the front wall and the rear wall of the hearth;
four cyclones, including a first cyclone C1, a second cyclone C2, a third cyclone C3 and a fourth cyclone C4, are sequentially arranged in parallel on the rear wall N1N4 of the hearth.
The four cyclone separators are respectively composed of an inlet flue and a cylinder body, the cylinder body structures and the sizes of the four cyclone separators are the same, the inlet flue structures and the sizes of the first cyclone separator C1 and the fourth cyclone separator C4 are the same, and the inlet flue structures and the sizes of the second cyclone separator C2 and the third cyclone separator C3 are the same.
In the top view, the wall surface of the inlet flue of the cyclone separator close to the central cylinder is an inner side wall, and the wall surface of the inlet flue of the cyclone separator far from the central cylinder is an outer side wall.
The intersection points of the inner side wall and the hearth back wall are replaced by a letter N, and the intersection points of the inner side wall and the hearth back wall are respectively represented by N1, N2, N3 and N4;
the intersection points of the outer side walls and the hearth back wall are replaced by a letter M, and the intersection points of the outer side walls of the four separators and the hearth back wall are respectively represented by M1, M2, M3 and M4;
the outer side walls of the inlet flues of the first cyclone separator C1 and the second cyclone separator C2 are arranged close to the central line of the front wall and the rear wall of the hearth, and the inner side wall of the inlet flue is arranged close to the left side wall of the hearth; the third cyclone separator C3 and the fourth cyclone separator C4 are arranged with the first cyclone separator C1 and the second cyclone separator C2 in axial symmetry about the center lines of the front wall N1N4 and the rear wall XY of the hearth.
The lengths of intersecting lines of the inlet flues of the four cyclone separators and the rear wall of the hearth are equal, namely N1M 1-N2M 2-M3N 3-M4N 4; while the distances between M1 and N2, N3 and M4 are equal.
The included angle of one side of the inner space formed by the rear wall and the inner side wall of the boiler furnace is an included angle alpha of the inner side wall, and the included angle of one side of the inner space formed by the rear wall and the outer side wall of the boiler furnace is an included angle beta of the outer side wall.
The included angle beta of the outer side walls of the inlets of the first cyclone separator C1 and the fourth cyclone separator C4 is 60-80 degrees;
the included angle alpha of the inner side walls of the flue at the inlet of the second cyclone separator C2 and the third cyclone separator C3 is 60-80 degrees;
wherein α ═ β.
The angle theta between the left side wall of the hearth and the left rear corner cut furnace wall is 120-150 degrees;
the positions of the inlet flues of the first cyclone separator and the second cyclone separator satisfy the following relations:
M1N2^2×tanα＝4×(1.0～1.5)M2M3×N1X
wherein, M1N2 is the distance between two points M1 and N2, M2M3 is the distance between two points M2 and M3, and N1X is the distance between two points N1 and X.
Example 2
As shown in fig. 2, a circulating fluidized bed boiler in which four separators are arranged in parallel, comprises:
the hearth is composed of four membrane type walls including a front wall, a rear wall, a left side wall and a right side wall, the cross section of the hearth is provided with a center line of the front wall and the rear wall of the hearth and a center line of the left side wall and the right side wall of the hearth, and the cross section of the hearth is axisymmetric about the two center lines;
four cyclone separators comprising a first cyclone separator C1', a second cyclone separator C2', a third cyclone separator C3 'and a fourth cyclone separator C4' are arranged in parallel on the rear wall of the hearth; the four cyclone separators are respectively composed of an inlet flue and a cylinder body, wherein the cylinder body structures and the sizes of the four cyclone separators are the same; the first cyclone separator C1 'and the fourth cyclone separator C4', and the second cyclone separator C2 'and the third cyclone separator C3' are arranged axisymmetrically about the center line of the front and rear walls of the furnace.
The outer side walls of the inlet flues of the two outermost cyclone separators (the first cyclone separator and the fourth cyclone separator) are arranged close to the left and right side walls of the hearth, and the inner side walls of the inlet flues of the two outermost cyclone separators are arranged close to the central line of the front and rear walls of the hearth; the outer side walls of the inlet flues of the middle two cyclone separators (the second cyclone separator and the third cyclone separator) are arranged close to the central line of the front wall and the rear wall of the hearth, and the inner side walls of the inlet flues of the middle two cyclone separators are arranged close to the left side wall and the right side wall of the hearth.
The intersections of the inner side walls and the furnace back wall are replaced by letters N ', and the intersections of the inner side walls of the four cyclone separators and the furnace back wall are respectively represented by N1', N2', N3' and N4 ';
the intersection points of the outer side walls and the hearth back wall are replaced by a letter M ', and the intersection points of the outer side walls of the four separators and the hearth back wall are respectively represented by M1', M2', M3' and M4 ';
the lengths of the intersecting lines of the inlet flues of the four cyclones and the rear wall of the hearth are equal, namely M1' N1 ═ N2' M2 ═ M3' N3 ═ N4' M4 '.
The sizes of the inlet flues of the four cyclone separators and the cross sections of the hearth meet the following relationship:
M1'N1'＝(0.10～0.25)×M1'M4'
M1'M＝(0.25～0.45)×M1'M4'
the positions of the inlet flues of the first cyclone separator and the second cyclone separator satisfy the following relations:
N1'N2'-M1'M×cotα＝(1.0～1.5)×M2'M3'
wherein, M1'N1' is the distance between two points M1 'and N1'; m1'M4' is the distance between two points M1 'and M41'; n1'N2' is the distance between two points N1 'and N2'; m1'M is the distance between M1' and M; m2'M3' is the distance between two points M2 'and M3'.
The included angle of one side of the inner space formed by the rear wall and the inner side wall of the boiler furnace is an included angle alpha of the inner side wall, and the included angle of one side of the inner space formed by the rear wall and the outer side wall of the boiler furnace is an included angle gamma of the outer side wall.
Included angles of inner side walls of inlet flues of the four cyclone separators are set, and alpha is 30-60 degrees; the angle gamma between the outer side wall of the inlet flues of the four cyclone separators and the rear wall of the hearth is between 90 and 100 degrees.
Example 3
As shown in FIG. 3, the difference between the present embodiment and embodiment 1 is that the included angle β between the outer side walls of the inlet flues of the four cyclone separators is between 90 and 105 degrees; the included angle alpha of the inner side walls of the inlet flues of the four cyclone separators is 60-80 degrees; the angle theta between the left side wall of the hearth and the left rear corner cut furnace wall is 120-150 degrees;
and, the positions of the inlet flues of the first and second cyclones C1, C2 satisfy the following relationship:
M1N2＝(1.0～1.5)×M2M3+N2M2/2×cotα
2×N1O×OA×sinθ+N1X^2×cotα＝2×M1N2×(0.8～1.2)×N1X
wherein N1O is the distance between N1 and O; OA is the distance between the two points O, A.
Example 4
As shown in fig. 4, the present embodiment of a circulating fluidized bed boiler with four parallel separators is different from embodiment 1 in that the cross section of the furnace is hexagonal and is composed of two corner cut film walls, i.e., a front wall, a rear wall, a left side wall, a right side wall and a rear wall, and the cross section of the furnace is axisymmetrical with respect to the center line of the front and rear walls of the furnace.
Example 5
As shown in fig. 5, the present embodiment is different from embodiment 1 in that the furnace is an annular furnace, the annular furnace is divided into an inner ring and an outer ring, the outer ring surrounds the inner ring, and an annular space between the inner ring and the outer ring forms a furnace space. The annular furnace of the embodiment is composed of an annular space between an octagonal inner ring A 'X' Y 'Q' P 'N4' N1 'O' and an octagonal outer ring AXYQPN4N 1O.
Example 6
As shown in fig. 6, the present embodiment differs from the embodiment 2 in that the furnace is an annular furnace, which is composed of an annular space between a quadrangular inner ring M "B" M4 "M1" and a quadrangular outer ring MBM4 'M1'.
The results of the experimental numerical calculations in the above examples show that: through the uniformity optimization design of the parallel arrangement of the single sides of the four cyclone separators, the mass concentration deviation of materials among the four circulation loops is reduced from 19.2% to 6%, and the material concentration distribution uniformity among the four circulation loops is improved by 48.0%.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (15)
1. A circulating fluidized bed boiler with four parallel separators is characterized by comprising a hearth and four cyclone separators; the hearth comprises a front wall, a rear wall, a left side wall and a right side wall; the cross section of the hearth is provided with a center line of a front wall and a rear wall of the hearth and a center line of a left side wall and a right side wall of the hearth, and the cross section of the hearth is axisymmetric about the two center lines; the four cyclone separators are respectively a first cyclone separator, a second cyclone separator, a third cyclone separator and a fourth cyclone separator which are arranged on the rear wall of the hearth in parallel; the four cyclone separators are respectively composed of an inlet flue and a cylinder body; and the lengths of intersecting lines of the inlet flues of the four cyclone separators and the rear wall of the hearth are equal.
2. The circulating fluidized bed boiler of claim 1, wherein the furnace is an annular furnace; the annular hearth comprises an inner ring and an outer ring; the outer ring surrounds the inner ring, and an annular space between the inner ring and the outer ring forms a hearth space.
3. A circulating fluidized bed boiler according to claim 1 or 2, characterized in that the furnace cross-section is hexagonal; the hearth also comprises two corner cutting film type walls of a rear wall; the two pieces of corner cutting film walls are respectively a left rear corner cutting and a right rear corner cutting.
4. The circulating fluidized bed boiler of claim 3, wherein the furnace cross-section is octagonal; the hearth also comprises four corner cutting film walls; the four corner cutting film walls are respectively a left rear corner cut, a right rear corner cut, a left front corner cut and a right front corner cut.
5. The circulating fluidized bed boiler of claim 4, wherein the inlet flues of the first cyclone separator and the fourth cyclone separator are the same in structure and size, and the inlet flues of the second cyclone separator and the third cyclone separator are the same in structure and size; the outer side walls of the inlet flues of the first cyclone separator and the second cyclone separator are arranged close to the central line of the front wall and the rear wall of the hearth, and the inner side walls are arranged close to the left side wall of the hearth; the third cyclone separator and the fourth cyclone separator are symmetrically arranged with the first cyclone separator and the second cyclone separator about a central line axis of the front wall and the rear wall of the hearth.
6. The circulating fluidized bed boiler of claim 5, wherein the included angle of the outer side wall of the inlet of the first cyclone separator and the outer side wall of the inlet of the fourth cyclone separator is between 60 and 80 degrees; the included angles of the inner side walls of the inlet flues of the second cyclone separator and the third cyclone separator are 60-80 degrees; and the angle theta between the left side wall of the hearth and the left rear corner cut furnace wall is 120-150 degrees.
7. The circulating fluidized bed boiler of claim 6, wherein the included angle of the outer wall of the inlet of the first cyclone and the fourth cyclone is equal to the included angle of the inner wall of the inlet flue of the second cyclone and the third cyclone.
8. The circulating fluidized bed boiler of claim 6 or 7, wherein the positions of the inlet flues of the first cyclone separator and the second cyclone separator each satisfy the following relationship:
M1N2^2×tanα＝4×(1.0～1.5)M2M3×N1X
wherein M1N2 is the distance between the point of intersection of the outer wall of the first cyclone separator and the rear wall of the hearth and the point of intersection of the inner wall of the second cyclone separator and the rear wall of the hearth, M2M3 is the distance between the point of intersection of the outer wall of the second cyclone separator and the rear wall of the hearth and the point of intersection of the outer wall of the third cyclone separator and the rear wall of the hearth, and N1X is the distance between the point of intersection of the inner wall of the first cyclone separator and the rear wall of the hearth and the two points of intersection of the front wall of the hearth and the left front corner-cut furnace wall.
9. A circulating fluidized bed boiler according to claim 1 or 2, characterized in that the four cyclones are of the same cylindrical configuration and size.
10. The circulating fluidized bed boiler of claim 9, wherein the first cyclone separator and the fourth cyclone separator, the second cyclone separator and the third cyclone separator are arranged axisymmetrically with respect to the center line of the front and rear walls of the furnace; the outer side walls of the inlet flues of the first cyclone separator and the fourth cyclone separator are arranged close to the left and right side walls of the hearth, and the inner side walls of the inlet flues are arranged close to the central line of the front wall and the rear wall of the hearth; the outer side walls of the inlet flues of the second cyclone separator and the third cyclone separator are arranged close to the central line of the front wall and the rear wall of the hearth, and the inner side walls of the inlet flues of the two cyclone separators in the middle are arranged close to the left side wall and the right side wall of the hearth.
11. The circulating fluidized bed boiler of claim 10, wherein the outer edge walls of the four cyclone inlet flues are at an angle of between 90 and 100 degrees with respect to the rear wall of the furnace; the included angle of the inner side walls of the inlet flues of the four cyclone separators is 30-60 degrees.
12. The circulating fluidized bed boiler of claim 11, wherein the four cyclone inlet flues and the furnace cross-sectional dimension satisfy the following relationship:
M1'N1'＝(0.10～0.25)×M1'M4'
M1'M＝(0.25～0.45)×M1'M4'
the positions of the inlet flues of the first cyclone separator and the second cyclone separator satisfy the following relations:
N1'N2'-M1'M×cotα＝(1.0～1.5)×M2'M3'
wherein, M1'N1' is the distance between the intersection point of the outer wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the inner wall of the first cyclone separator and the rear wall of the hearth; n1'N2' is the distance between the intersection point of the inner wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the inner wall of the second cyclone separator and the rear wall of the hearth; m1' M is the distance between the intersection point of the outer wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the left wall of the hearth and the front wall of the hearth; m2'M3' is the distance between the intersection point of the outer wall of the second cyclone separator and the rear wall of the hearth and the intersection point of the outer wall of the third cyclone separator and the rear wall of the hearth; m1'M4' is the distance between the intersection point of the outer wall of the first cyclone and the rear wall of the hearth and the intersection point of the outer wall of the fourth cyclone and the rear wall of the hearth.
13. The circulating fluidized bed boiler of claim 4, wherein the outer wall included angles of the four cyclone inlet flues are between 90 and 105 degrees; the included angle of the inner side wall of the inlet flue of the cyclone separator is 60-80 degrees; the angle between the left side wall of the hearth and the left rear corner cut furnace wall is 120-150 degrees.
14. The circulating fluidized bed boiler of claim 13, wherein the inlet flues of the first and second cyclones are positioned in a relationship:
M1N2＝(1.0～1.5)×M2M3+N2M2/2×cotα
2×N1O×OA×sinθ+N1X^2×cotα＝2×M1N2×(0.8～1.2)×N1X
wherein M1N2 is the distance between the intersection point of the outer wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the inner wall of the second cyclone separator and the rear wall of the hearth; M2M3 is the distance between the intersection point of the outer wall of the second cyclone separator and the rear wall of the hearth and the distance between the intersection point of the outer wall of the third cyclone separator and the rear wall of the hearth; N2M2 is the distance between the intersection points of the inner wall and the outer wall of the second cyclone separator and the rear wall of the hearth; N1O is the distance between the intersection point of the inner side wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the rear wall of the hearth and the left rear corner-cut furnace wall; OA is the distance between the intersection point of the hearth rear wall and the left rear corner-cutting furnace wall and the intersection point of the left side wall of the hearth and the left front corner-cutting furnace wall; N1X is the distance between two points of the intersection point of the inner wall of the first cyclone separator and the rear wall of the hearth and the intersection point of the front wall of the hearth and the left front corner-cut furnace wall.
15. A parallel arrangement method of four separators of a circulating fluidized bed boiler is characterized by comprising an arrangement method of four cyclone separators in the circulating fluidized bed boiler.
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| CN202011406822.1A CN112413574A (en) | 2020-09-01 | 2020-09-01 | Parallel arrangement method for four separators of circulating fluidized bed boiler |
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