CN111962956A - Method for improving D-shaped inner cylinder chimney - Google Patents
Method for improving D-shaped inner cylinder chimney Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000012423 maintenance Methods 0.000 claims description 15
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- 238000006073 displacement reaction Methods 0.000 claims description 10
- 206010022000 influenza Diseases 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
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- 238000009420 retrofitting Methods 0.000 claims 5
- 238000005516 engineering process Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 230000009471 action Effects 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
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- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/28—Chimney stacks, e.g. free-standing, or similar ducts
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Abstract
The invention relates to a method for improving a D-shaped inner cylinder chimney, and belongs to the technical field of chimney design and construction. The invention improves the utilization efficiency coefficient of the chimney of the outer cylinder, controls the increase of the diameter of the inner cylinder, and finds the balance point of the needed technology and economy by adjusting the size of the cutting half angle theta. The invention overcomes the limitation of the application of the D-shaped sleeve chimney technology due to the shortage of economic cost under the condition that the unit prices of the inner and outer cylinder materials are greatly different. The technical scheme provided by the invention actively sacrifices partial advantages of the outer cylinder of the original D-shaped sleeve chimney, and reduces the increment of the inner cylinder material to a lower level so as to improve the overall economic and technical level of the chimney, thereby expanding the application range of the original D-shaped sleeve chimney.
Description
Technical Field
The invention relates to a method for improving a D-shaped inner cylinder chimney, and belongs to the technical field of chimney design and construction.
Background
The sleeve type chimney comprises a smoke exhaust inner cylinder (simply called 'inner cylinder') and an outer cylinder wall (simply called 'outer cylinder'), the outer cylinder is used as a bearing structure and bears the effects of wind load, earthquake, inner cylinder self-weight, horizontal displacement and the like, and the inner cylinder is used for discharging smoke with a corrosion effect; the sleeve chimney realizes two loads or functions of directly bearing external loads such as wind and the like and directly bearing the action of smoke; different structures bear loads or actions with different properties respectively, so that the normal work of the device is ensured. In the construction of a thermal power plant, two units share one outer cylinder chimney, and one unit corresponds to one smoke exhaust inner cylinder. In order to realize that two loads or functions with different properties, such as directly bearing external loads such as wind and the like and directly bearing the action of smoke, are borne by different structures respectively and meet the overhaul and maintenance requirements of different service lives, at home and abroad, the reinforced concrete outer cylinder with the circular horizontal section is usually adopted to bear the actions of wind load, earthquake, inner cylinder self-weight, horizontal displacement and the like, and the two inner cylinders with the circular horizontal section are specially used for discharging the smoke with high temperature and corrosion action, so that the functional separation of the inner cylinder and the outer cylinder is realized, and the two inner cylinders independently operate under different working conditions, which is the main advantage of the common double-inner-cylinder chimney.
Although the common double-inner-cylinder chimney has the advantages in function, the plane arrangement shape of the common double-inner-cylinder chimney is determined by the arrangement mode of the two inner cylinders: the dimension in one direction exceeds twice the dimension in the other vertical direction, so that a large space is wasted on the horizontal section of the outer cylinder, namely, the ratio of the sum of the sectional areas (called as effective area) of the two inner cylinders to the sectional area of the outer cylinder is small, namely, the coefficient of the utilization efficiency of the outer cylinder is low (see figure 1). Generally, the cross-sectional area of the inner cylinder is determined by the smoke discharge amount and is a fixed value, while the outer cylinder serves the inner cylinder, and the cross-sectional size of the inner cylinder can be adjusted under the condition of meeting the smoke discharge area and the planar arrangement of the inner cylinder, so that the adjustment of the cross-sectional shape and the arrangement mode of the inner cylinder is the only means for improving the utilization efficiency of the outer cylinder.
The common double-inner-cylinder chimney has a low utilization efficiency coefficient, and under the condition of the same effective area, the sectional dimension of the outer cylinder is greatly increased, meanwhile, the wall thickness of the upper cylinder wall of the chimney is also greatly increased due to the fact that the circumferential wind bending moment of the chimney is in a direct proportion relation with the square of the radius of the section, so that the material consumption and the occupied area of the reinforced concrete outer cylinder above the ground are increased, the basic engineering quantity is indirectly greatly increased, and the construction period and the engineering investment of the whole chimney are greatly increased compared with those of a single-cylinder chimney.
Based on the background, the patent technology of the D-shaped sleeve chimney (Chinese patent number: ZL201720076060.0) is better applied. The patent technology of the D-shaped sleeve chimney is characterized in that the diameter of the outer cylinder can be greatly reduced, the utilization efficiency of the outer cylinder is greatly improved, the material consumption is obviously reduced, and the reduction amplitude can reach about 30%. But the technology greatly reduces the material consumption of the outer cylinder, increases the material consumption of the inner cylinder, and increases the amplitude by about 17 percent to the maximum extent. When the unit prices of the materials of the inner barrel and the outer barrel are similar, or the price of the material of the inner barrel is not obviously increased compared with that of the material of the outer barrel, the technology has obvious advantages, for example, if the inner barrel and the outer barrel are both steel chimneys, the technology has absolute economic advantages.
However, for the wet desulphurization chimney, the flue gas is strong corrosive wet flue gas, and has higher requirements on the temperature resistance and corrosion resistance of the inner cylinder material, the unit price of the inner cylinder material is often higher, and the price difference of the inner and outer cylinder materials is larger, in this case, a D-shaped sleeve chimney is adopted, and the material consumption of the outer cylinder is reduced, but the material consumption of the inner cylinder is increased; the economic advantage is not very obvious, so when the materials of the inner cylinder and the outer cylinder are different, the patent technology has a further optimization space, and a balance point needs to be found in the two aspects of the diameter reduction amplitude of the outer cylinder and the diameter increase amplitude of the inner cylinder, so that the optimal economic and technical combination scheme is obtained.
Disclosure of Invention
The invention aims to solve the technical problem that how to find a balance point between the diameter reduction amplitude of the outer cylinder and the diameter increase amplitude of the inner cylinder of the double D-shaped inner cylinder chimney so as to obtain the optimal economic and technical scheme.
In order to solve the above problems, the technical solution adopted by the present invention is to provide a method for improving a "D" shaped inner barrel chimney, comprising the following steps:
step 1: dividing a circular inner cylinder into two equal parts along the diameter, wherein the cutting chord length is equal to the diameter of the inner cylinder, the cutting half angle corresponding to the chord length is a central angle formed by a middle point of a chord, a tangent point of the chord on the circumference and a circle center, and the cutting half angle is equal to 90 degrees at the moment; the improved D-shaped sleeve chimney is cut at a non-diameter position of the circular inner cylinder, the chord length of the cut is smaller than the diameter of the circle, the cutting half angle theta corresponding to the chord length is smaller than 90 degrees, the sizes of the inner cylinder and the outer cylinder are determined by adjusting the size of the cutting half angle theta, and a required technical and economic balance point is found;
step 2: the outer cylinder and the two inner cylinders are arranged, the two inner cylinders are mutually independent, and the two improved D-shaped inner cylinders have the same size; the distance between the two improved D-shaped inner cylinders meets the requirements of supporting, installation, personnel passing and maintenance; the distance between the improved D-shaped inner cylinder and the outer cylinder meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic;
and step 3: a specific profile control formula is prepared as follows:
in the formula:
theta is a cutting half angle of the improved D-shaped sleeve chimney;
k is the circumferential adjusting coefficient of the inner cylinder of the improved D-shaped sleeve chimney;
d 0-the initial diameter of the circular inner cylinder when the chimney is common double circular inner cylinder;
d1-double inner barrel diameter of modified double "D" sleeve chimney.
And 4, step 4: according to the arrangement principle of the step 2, after the plane and the vertical arrangement are determined, on the premise of keeping the area of the inner cylinder unchanged, determining the perimeter adjustment coefficient of the inner cylinder, namely the inner cylinder material increase coefficient K, according to the economic indexes of the inner cylinder and the outer cylinder, substituting the inner cylinder material increase coefficient K into the shape control formulas (1) and (2) in the step 3, and calculating the corresponding half angle theta and the diameter D1 of the improved D-shaped inner cylinder, so that the section size of the improved D-shaped inner cylinder is determined, and the size is the inner cylinder scheme under the optimal economic and technical combination.
Preferably, in the step 2, the two improved D-shaped inner cylinders are symmetrically arranged in the outer cylinder with a circular cross section, and the inner cylinders can independently expand and contract freely in the vertical direction.
Preferably, in the step 2, inner cylinder chamfers are arranged at joints of circular arcs and cutting chords of the two improved D-shaped inner cylinders.
Preferably, in the step 2, according to design requirements, horizontal shaking prevention devices may be disposed at different heights in the vertical direction of the chimney, that is, a horizontal shaking prevention device for limiting horizontal displacement of the improved D-shaped inner cylinder is disposed in the outer cylinder, and horizontal displacement of the improved D-shaped inner cylinder is limited by each layer of shaking prevention platform of the chimney.
Preferably, the initial diameter of the chimney inner cylinder of the common double-circular inner cylinder in the step 3 is D0, and the diameter of the outer cylinder is D0; the diameter of the double inner cylinders of the improved double-D-shaped sleeve chimney is D1, and the diameter of the outer cylinder is D1; the diameter of the double inner cylinders of the D-shaped sleeve chimney is set as D, and the diameter of the outer cylinder is set as D; the diameter relationship is set as:
d0<d1<d(d＝2R)
D<D1<D0
preferably, the cutting half-angle θ of the two improved D-shaped inner cylinders in the step 4 is in a range of (0 ° to 90 °); when theta is equal to 0 degree, the improved D-shaped inner cylinder evolves into a cylinder chimney, and the cylinder chimney is recovered to a common double-inner-cylinder chimney; when theta is 90 degrees, the improved D-shaped inner cylinder is evolved into a D-shaped inner cylinder, and the method is suitable for the condition that the unit price of the inner cylinder anticorrosive material is low; when the value range is (45-65 degrees), the method is suitable for the condition that the unit price of the inner barrel anticorrosive material is higher.
The invention provides an improved D-shaped inner cylinder chimney, and the corresponding half angle theta and the diameter D1 of the improved D-shaped inner cylinder are calculated according to the method for improving the D-shaped inner cylinder chimney, so that the section size of the improved D-shaped inner cylinder is determined; the walls of the two inner cylinders are respectively provided with a flue, a first connecting line is arranged between the central position of the opening of the flue on the wall of the inner cylinder and the circle center of the corresponding inner cylinder, a second connecting line is arranged between the circle centers of the two inner cylinders, and the included angle between the first connecting line and the second connecting line is set to be 45 degrees; the outer cylinder walls corresponding to the flues respectively arranged on the two inner cylinder walls are provided with outer cylinder openings, and the connecting line between the central positions of the two outer cylinder openings is intersected with the central shaft of the outer cylinder.
Compared with the prior art, the invention has the following beneficial effects:
the invention improves the utilization efficiency coefficient of the chimney of the outer cylinder, controls the increase of the diameter of the inner cylinder, and finds out the required technical and economic balance point by adjusting the size of the cutting half angle theta. The invention overcomes the defect that the patent technology of the D-shaped sleeve chimney is insufficient under the condition that the unit prices of the inner and outer cylinders are greatly different, and the technical scheme provided by the invention actively sacrifices partial advantages of the outer cylinder of the original D-shaped sleeve chimney, reduces the increment of the inner cylinder material to a lower level so as to improve the overall economic and technical level of the chimney and expand the application range of the original D-shaped sleeve chimney.
Drawings
FIG. 1 is a schematic plan view of a conventional dual inner barrel stack;
FIG. 2 is a schematic plan view of a double "D" sleeve stack;
FIG. 3 is a schematic plan view of a modified "D" sleeve stack;
FIG. 4 is a schematic diagram of a horizontal flue plane layout of a modified D-shaped sleeve chimney.
Reference numerals: 1. an outer cylinder of a common double-inner-cylinder chimney; 2. an inner cylinder of a common double-inner cylinder chimney; 3, a D-shaped sleeve chimney outer cylinder; 4, a chimney inner cylinder of a D-shaped sleeve; cutting string in the inner cylinder of the D-shaped sleeve chimney; 6. an improved D-shaped sleeve chimney outer cylinder; 7. an improved D-shaped sleeve chimney inner cylinder; 8. the improved D-shaped sleeve chimney inner cylinder cuts the string; d0. the diameter of the inner cylinder of the common double-inner cylinder chimney; D0. the diameter of the outer cylinder of the common double-inner-cylinder chimney; r. inner cylinder chamfer radius; r. the radius of the inner cylinder of the D-shaped sleeve chimney; d, the diameter of the outer cylinder of the chimney of the D-shaped sleeve; d1. the diameter of the inner cylinder of the improved D-shaped sleeve chimney; D1. the diameter of the outer cylinder of the improved D-shaped sleeve chimney; b. the distance between the two inner cylinders or the distance between the inner cylinder and the outer cylinder; the centers of the inner cylinders of the C1 and C2. improved D-shaped sleeve chimneys; the centers of the openings of the flues of the inner cylinders of the K1 and K2. improved D-shaped sleeve chimneys; C0. the center of the outer cylinder of the improved D-shaped sleeve chimney; K0. the center of the outer cylinder flue of the improved D-shaped sleeve chimney is provided with a hole.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:
as shown in fig. 1-4, the present invention provides a method of modifying a "D" shaped inner barrel chimney comprising the steps of:
step 1: dividing a circular inner cylinder into two equal parts along the diameter, wherein the cutting chord length is equal to the diameter of the inner cylinder, the cutting half angle corresponding to the chord length is a central angle formed by a middle point of a chord, a tangent point of the chord on the circumference and a circle center, and the cutting half angle is equal to 90 degrees at the moment; the improved D-shaped sleeve chimney is cut at a non-diameter position of the circular inner cylinder, the chord length of the cut is smaller than the diameter of the circle, the cutting half angle theta corresponding to the chord length is smaller than 90 degrees, the sizes of the inner cylinder and the outer cylinder are determined by adjusting the size of the cutting half angle theta, and a required technical and economic balance point is found;
step 2: the outer cylinder and the two inner cylinders are arranged, the two inner cylinders are mutually independent, and the two improved D-shaped inner cylinders have the same size; the distance between the two improved D-shaped inner cylinders meets the requirements of supporting, installation, personnel passing and maintenance; the distance between the improved D-shaped inner cylinder and the outer cylinder meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic;
and step 3: a specific profile control formula is prepared as follows:
in the formula:
theta is a cutting half angle of the improved D-shaped sleeve chimney;
k is the circumferential adjusting coefficient of the inner cylinder of the improved D-shaped sleeve chimney;
d 0-the initial diameter of the circular inner cylinder when the chimney is common double circular inner cylinder;
d1-double inner barrel diameter of modified double "D" sleeve chimney.
And 4, step 4: according to the arrangement principle of the step 2, after the plane and the vertical arrangement are determined, on the premise of keeping the area of the inner cylinder unchanged, determining the perimeter adjustment coefficient of the inner cylinder, namely the inner cylinder material increase coefficient K, according to the economic indexes of the inner cylinder and the outer cylinder, substituting the inner cylinder material increase coefficient K into the shape control formulas (1) and (2) in the step 3, and calculating the corresponding half angle theta and the diameter D1 of the improved D-shaped inner cylinder, so that the section size of the improved D-shaped inner cylinder is determined, and the size is the inner cylinder scheme under the optimal economic and technical combination.
In the step 2, the two improved D-shaped inner cylinders are symmetrically arranged in the outer cylinder with a circular section, and the inner cylinders can independently expand and contract freely in the vertical direction.
And 2, inner cylinder chamfers are arranged at the joints of the circular arcs and the cutting strings of the two improved D-shaped inner cylinders in the step 2.
In the step 2, according to design requirements, horizontal shaking-stopping devices can be arranged at different vertical heights along the chimney, namely, the horizontal shaking-stopping devices used for limiting the horizontal displacement of the improved D-shaped inner barrel are arranged in the outer barrel, and the horizontal displacement of the improved D-shaped inner barrel is limited by each layer of shaking-stopping platform of the chimney.
Setting the initial diameter of the chimney inner cylinder of the common double-circular inner cylinder in the step 3 as D0 and the diameter of the outer cylinder as D0; the diameter of the double inner cylinders of the improved double-D-shaped sleeve chimney is D1, and the diameter of the outer cylinder is D1; the diameter of the double inner cylinders of the D-shaped sleeve chimney is set as D, and the diameter of the outer cylinder is set as D; the diameter relationship is set as:
d0<d1<d(d＝2R)
D<D1<D0
the value range of the cutting half angle theta of the two improved D-shaped inner cylinders in the step 4 is (0-90 degrees); when theta is equal to 0 degree, the improved D-shaped inner cylinder evolves into a cylinder chimney, and the cylinder chimney is recovered to a common double-inner-cylinder chimney; when theta is 90 degrees, the improved D-shaped inner cylinder is evolved into a D-shaped inner cylinder, and the method is suitable for the condition that the unit price of the inner cylinder anticorrosive material is low; when the value range is (45-65 degrees), the method is suitable for the condition that the unit price of the inner barrel anticorrosive material is higher.
Examples
As shown in fig. 1: an ordinary double-inner-cylinder chimney inner cylinder 2 is arranged in the ordinary double-inner-cylinder chimney outer cylinder 1; the initial diameter of the circular inner cylinder of the common double-circular inner cylinder chimney is d 0; the distance b between the two inner cylinders 2 meets the requirements of supporting, installation, personnel passing and maintenance; the distance b between the inner cylinder 2 and the outer cylinder 1 meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic; the diameter of the outer cylinder of the common double-inner-cylinder chimney is set as D0.
As shown in fig. 2: two D-shaped sleeve chimney inner cylinders 4 are arranged in the D-shaped sleeve chimney outer cylinder 3; the inner cylinder 4 is provided with a D-shaped sleeve chimney inner cylinder cutting string 5; the diameter of the inner cylinder of the D-shaped sleeve chimney inner cylinder is set as D, namely 2R; the distance b between the two inner cylinders 4 meets the requirements of supporting, installation, personnel passing and maintenance; the distance b between the inner cylinder 4 and the outer cylinder 3 meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic; the diameter of the outer cylinder of the D-shaped sleeve chimney is set as D.
As shown in fig. 3: 2 improved D-shaped sleeve chimney inner cylinders 7 are arranged in the improved D-shaped sleeve chimney outer cylinder 6; an improved D-shaped sleeve chimney inner cylinder cutting string 8 is arranged on the chimney inner cylinder 7; the diameter of the inner cylinder of the improved D-shaped sleeve chimney is D1; the distance b between the two inner cylinders 7 meets the requirements of supporting, installation, personnel passing and maintenance; the distance b between the inner cylinder 7 and the outer cylinder 6 meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic; the diameter of the outer cylinder of the improved D-shaped sleeve chimney is set as D1.
The improved D-shaped sleeve chimney comprises an outer cylinder 6 and two inner cylinders 7 which are independent from each other, and the two improved D-shaped inner cylinders 7 are the same in size, as shown in figure 3. Two improved D-shaped inner cylinders 7 are symmetrically arranged in an outer cylinder 6 with a circular section, and can independently expand and contract freely in the vertical direction. The distance b between the two improved D-shaped inner cylinders 7 meets the requirements of supporting, installation, personnel passing and maintenance; the distance b between the improved D-shaped inner cylinders 7 and the outer cylinder 8 meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic, inner cylinder chamfers are arranged at the joints of the circular arcs and the cutting strings of the two improved D-shaped inner cylinders 7, and the radius r of the inner cylinder chamfers meets the requirements of reducing temperature stress concentration, corrosion resistance and smoke resistance. According to the design requirement, horizontal shaking-stopping devices can be arranged at different vertical heights of the chimney, namely the horizontal shaking-stopping devices used for limiting the horizontal displacement of the improved D-shaped inner cylinder 7 are arranged in the outer cylinder 6, and the horizontal displacement of the improved D-shaped inner cylinder 7 is limited by each layer of shaking-stopping platform of the chimney.
The invention discloses an improved D-shaped sleeve chimney which comprises an outer cylinder and two improved D-shaped inner cylinders, wherein the two improved D-shaped inner cylinders are independent from each other and are symmetrically arranged in the outer cylinder with a circular horizontal section, and the value range of a cutting half angle theta of each improved D-shaped inner cylinder is (0-90 degrees). When the cutting half angle theta is equal to 0 degrees, the improved D-shaped inner cylinder evolves into a cylinder chimney, and the cylinder chimney is recovered to a common double-inner-cylinder chimney; when theta is 90 degrees, the improved D-shaped inner cylinder is evolved into a D-shaped inner cylinder, and the method is suitable for the condition that the unit price of the inner cylinder anticorrosive material is low; when the value range is (45-65 degrees), the method is suitable for the condition that the unit price of the inner barrel anticorrosive material is higher.
As shown in fig. 4, the center of the inner cylinder of the improved D-shaped inner cylinder chimney is set to be C1 and C2.; the centers of the openings of the inner cylinder flue of the improved D-shaped sleeve chimney are set to be K1 and K2.; the center of the outer cylinder of the improved D-shaped sleeve chimney is set to be C0.; the center of the flue opening of the outer cylinder of the improved D-shaped sleeve chimney is set to be K0.. The half angle theta and the diameter D1 corresponding to the section size of the D-shaped inner cylinder can be finally determined and optimized by determining the adjusting coefficient K of the circumference of the inner cylinder through the economic indexes of the inner cylinder and the outer cylinder and substituting the adjusting coefficients into the shape control formulas (1) and (2). The technology can determine the optimized technology and economic balance point of the inner cylinder and the outer cylinder, and the overall benefit maximization of the chimney is realized. The arrangement mode of the matched horizontal flue of the invention is as follows: the central line of the opening of the flue (the connecting line of K1 and C1 and the connecting line of K2 and C2) and the connecting line of the centers of the two inner cylinders (the connecting line of C1 and C2) are arranged at an optimal angle of 45 degrees, and the connecting line of three points, K0 and C0, corresponding to the middle point of the two openings of the outer cylinder is arranged in a straight line, so that the arrangement mode of the flue can reduce the discharge resistance of the flue gas in the flue area, the flue gas can reach a relatively uniform state in the vertical direction at a short distance, the temperature gradient of the flue gas across the cross section of the inner cylinder is.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (7)
1. A method for improving a D-shaped inner cylinder chimney is characterized in that: the method comprises the following steps:
step 1: dividing a circular inner cylinder into two equal parts along the diameter, wherein the cutting chord length is equal to the diameter of the inner cylinder, the cutting half angle corresponding to the chord length is a central angle formed by a middle point of a chord, a tangent point of the chord on the circumference and a circle center, and the cutting half angle is equal to 90 degrees at the moment; the improved D-shaped sleeve chimney is cut at a non-diameter position of the circular inner cylinder, the chord length of the cut is smaller than the diameter of the circle, the cutting half angle theta corresponding to the chord length is smaller than 90 degrees, the sizes of the inner cylinder and the outer cylinder are determined by adjusting the size of the cutting half angle theta, and a required technical and economic balance point is found;
step 2: the outer cylinder and the two inner cylinders are arranged, the two inner cylinders are mutually independent, and the two improved D-shaped inner cylinders have the same size; the distance between the two improved D-shaped inner cylinders meets the requirements of supporting, installation, personnel passing and maintenance; the distance between the improved D-shaped inner cylinder and the outer cylinder meets the requirements of supporting, installation, personnel passing and maintenance, and also meets the requirement of vertical traffic;
and step 3: a specific profile control formula is prepared as follows:
in the formula:
theta is a cutting half angle of the improved D-shaped sleeve chimney;
k is the circumferential adjusting coefficient of the inner cylinder of the improved D-shaped sleeve chimney;
d 0-the initial diameter of the circular inner cylinder when the chimney is common double circular inner cylinder;
d1-double inner barrel diameter of modified double "D" sleeve chimney.
And 4, step 4: according to the arrangement principle of the step 2, after the plane and the vertical arrangement are determined, on the premise of keeping the area of the inner cylinder unchanged, determining the perimeter adjustment coefficient of the inner cylinder, namely the inner cylinder material increase coefficient K, according to the economic indexes of the inner cylinder and the outer cylinder, substituting the inner cylinder material increase coefficient K into the shape control formulas (1) and (2) in the step 3, and calculating the corresponding half angle theta and the diameter D1 of the improved D-shaped inner cylinder, so that the section size of the improved D-shaped inner cylinder is determined, and the size is the inner cylinder scheme under the optimal economic and technical combination.
2. A method of retrofitting a D-shaped inner barrel chimney according to claim 1 wherein: in the step 2, the two improved D-shaped inner cylinders are symmetrically arranged in the outer cylinder with a circular section, and the inner cylinders can independently expand and contract freely in the vertical direction.
3. A method of retrofitting a D-shaped inner barrel chimney according to claim 2, wherein: and in the step 2, inner cylinder chamfers are arranged at the joints of the circular arcs of the two improved D-shaped inner cylinders and the cutting strings.
4. A method of retrofitting a D-shaped inner barrel chimney according to claim 3 wherein: in the step 2, according to design requirements, horizontal shaking-stopping devices can be arranged at different vertical heights along the chimney, namely, the horizontal shaking-stopping devices used for limiting the horizontal displacement of the improved D-shaped inner barrel are arranged in the outer barrel, and the horizontal displacement of the improved D-shaped inner barrel is limited by each layer of shaking-stopping platform of the chimney.
5. The method of retrofitting a "D" shaped inner barrel chimney according to claim 4 wherein: setting the initial diameter of the chimney inner cylinder of the common double-circular inner cylinder in the step 3 as D0 and the diameter of the outer cylinder as D0; the diameter of the double inner cylinders of the improved double-D-shaped sleeve chimney is D1, and the diameter of the outer cylinder is D1; the diameter of the double inner cylinders of the D-shaped sleeve chimney is set as D, and the diameter of the outer cylinder is set as D; the diameter relationship is set as:
d0<d1<d (d＝2R)
D<D1<D0 。
6. a method of retrofitting a D-shaped inner barrel chimney according to claim 5 wherein: the value range of the cutting half angle theta of the two improved D-shaped inner cylinders in the step 4 is 0-90 degrees; when theta is equal to 0 degree, the improved D-shaped inner cylinder evolves into a cylinder chimney, and the cylinder chimney is recovered to a common double-inner-cylinder chimney; when theta is 90 degrees, the improved D-shaped inner cylinder is evolved into a D-shaped inner cylinder and is suitable for a steel sleeve chimney; when the value range is 45-65 degrees, the method is suitable for the condition that the unit price of the inner barrel anticorrosive material is higher.
7. An improved generation "D" shape inner tube chimney which characterized in that: the method of claim 6, wherein the corresponding half angle θ and the diameter D1 of the improved D-shaped inner cylinder are calculated to determine the sectional dimension of the improved D-shaped inner cylinder; the walls of the two inner cylinders are respectively provided with a flue, a first connecting line is arranged between the central position of the opening of the flue on the wall of the inner cylinder and the circle center of the corresponding inner cylinder, a second connecting line is arranged between the circle centers of the two inner cylinders, and the included angle between the first connecting line and the second connecting line is set to be 45 degrees; the outer cylinder walls corresponding to the flues respectively arranged on the two inner cylinder walls are provided with outer cylinder openings, and the connecting line between the central positions of the two outer cylinder openings is intersected with the central shaft of the outer cylinder.
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