CN108534162B - Flue device for thermal power generation - Google Patents
Flue device for thermal power generation Download PDFInfo
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- CN108534162B CN108534162B CN201810166871.9A CN201810166871A CN108534162B CN 108534162 B CN108534162 B CN 108534162B CN 201810166871 A CN201810166871 A CN 201810166871A CN 108534162 B CN108534162 B CN 108534162B
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- flue
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
- F23J11/02—Devices for conducting smoke or fumes, e.g. flues for conducting smoke or fumes originating from various locations to the outside, e.g. in locomotive sheds, in garages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/02—Linings; Jackets; Casings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
- Panels For Use In Building Construction (AREA)
Abstract
The invention discloses a flue device for thermal power generation, and belongs to the field of steel structures. The flue device for thermal power generation is connected by a plurality of support panels to form four flue walls of the flue device, a plurality of steel frame strips are arranged and fixed on the outer wall surface of each flue wall at intervals of a first preset distance along the flow direction of flue gas, the steel frame strips on the adjacent outer wall surfaces are connected, a plurality of steel beams are arranged and fixed between two adjacent steel frame strips at intervals of a second preset distance along the vertical direction of the flow direction of the flue gas, a plurality of rib plates are arranged and fixed between two adjacent steel beams at intervals of a third preset distance along the flow direction of the flue gas, and part of the steel frame strips are replaced by the steel beams and the rib plates, the reduction that can realize steelframe frame strip use quantity and the interior vaulting pole that corresponds use quantity has reduced the flue gas flow resistance, has reduced the inside anticorrosive area that needs of flue device, has practiced thrift the operation maintenance cost.
Description
Technical Field
The invention relates to the field of steel structures, in particular to a flue device for thermal power generation.
Background
In the power generation process of a coal-fired, gas-fired or oil-fired generating set in a thermal power plant, a large amount of flue gas can be generated due to the combustion of fuel. Flue gas generated by unit combustion can sequentially pass through flue gas treatment equipment such as desulfurization, dust removal and desulfurization under the drive of equipment such as a draught fan and a blower, and is discharged to the atmosphere through a chimney after meeting the requirements of the atmospheric pollutant emission standard of a thermal power plant formulated by the international environmental protection department. Along with the increasing of domestic power supply demand, domestic 1000 MW-level thermal power plants are increasing day by day, and the section of the flue device on the two sides of the chimney is larger and larger due to the amount of flue gas generated by the high-power unit.
Flue device among the prior art adopts four supporting panel to constitute flue major structure usually, and wherein, the thickness of supporting panel adopts 6mm usually, then welds the steelframe frame strip according to the certain distance respectively on every supporting panel, and the interval between the steelframe frame strip is generally not more than 800mm, at last inside setting inner stay pole corresponding to the steelframe frame strip that supports the panel to the stability of reinforcing flue.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the steel construction quantity of flue device among the prior art is big, because the quantity that interior vaulting pole used is many, has not only increased the inside anticorrosive area that needs of flue device, has increased the possibility of corroding the seepage moreover between interior vaulting pole and the supporting panel, simultaneously, easily arouses the increase of flue gas flow resistance, leads to fan power to increase, the extravagant energy, increases the operation maintenance cost.
Disclosure of Invention
In view of this, the invention provides a flue device for thermal power generation, which is used for reducing the consumption of steel structures, reducing the possibility of corrosion and leakage and saving the operation and maintenance cost.
Specifically, the method comprises the following technical scheme:
a flue apparatus for thermal power generation, the flue apparatus comprising: support panel, steel beam, ribbed plate, steel frame strip and inner support rod,
a plurality of said support panels connected to form four flue walls of said flue means;
a plurality of steel frame strips are arranged and fixed on the outer wall surface of each flue wall at intervals of a first preset distance along the flow direction of flue gas, and the steel frame strips on the adjacent outer wall surfaces are connected;
a plurality of steel beams are arranged and fixed on the outer wall surface of each flue wall between two adjacent steel frame bars at intervals along the vertical direction of the flow direction of the flue gas by a second preset distance;
a plurality of rib plates are arranged and fixed on the outer wall surface of each flue wall and between two adjacent steel beams at intervals of a third preset distance along the flow direction of the flue gas;
the flue device is internally provided with a plurality of inner supporting rods, and the end part of each inner supporting rod is abutted against the outer wall surface corresponding to the position and is correspondingly fixed with the steel frame strip.
Further, the first preset distance is obtained according to the following calculation formula:
in the formula: s1The reference value of the first preset distance is the unit of mm; m is1The unit length mass of a cross section formed by one of the steel beams and the supporting panel with the effective length on any flue wall is kg/mm, wherein the value of the effective length is 30 times of the thickness of the supporting panel; e is the modulus of elasticity of the steel material in N/mm2；I1The section inertia moment of a section formed by one of the steel beams and the support panel with effective length on any flue wall is in mm4(ii) a f is the set natural frequency in Hz.
Further, the second preset distance is obtained according to the following calculation formula:
in the formula: s2The unit of the reference value of the second preset distance is mm; m is2The mass per unit length of a cross section formed by one of the rib plates and the support panel with effective length on any flue wall is kg/mm; i is2The second moment of area in mm of the cross section formed by one of the rib plates and the support panel of effective length on any flue wall4。
Further, the value of the third preset distance is less than 700 mm.
Further, the thickness of the supporting panel is 3-5 mm.
Further, the width of the steel beam is smaller than that of the steel frame strip.
Further, the width of the rib plate is smaller than that of the steel beam.
Further, the rib plates are L-shaped rib plates or T-shaped rib plates.
Further, the ends of the plurality of inner stays are connected to each other to form a triangle.
Further, the steel frame strips, the steel beams, the rib plates and the supporting panels are fixed in a full-length welding mode.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a flue device for thermal power generation, which utilizes a plurality of supporting panels to connect and form four flue walls of the flue device, a plurality of steel frame strips are arranged and fixed on the outer wall surface of each flue wall at intervals of a first preset distance along the flow direction of flue gas, the steel frame strips on the adjacent outer wall surfaces are connected, a plurality of steel beams are arranged and fixed between two adjacent steel frame strips at intervals of a second preset distance along the vertical direction of the flow direction of the flue gas, a plurality of rib plates are arranged and fixed between two adjacent steel beams at intervals of a third preset distance along the flow direction of the flue gas, a plurality of inner supporting rods are arranged in the flue device, the steel frame strips are correspondingly fixed on the outer wall surface corresponding to the abutting position of the end part of each inner supporting rod, partial steel frame strips are replaced by the steel beams and the rib plates, the use number of the steel frame strips and the use number of the corresponding inner supporting rods can be reduced, not only reduced the inside anticorrosive area that needs of flue device, reduced the possibility of corroding the seepage between interior vaulting pole and the supporting panel, practiced thrift the operation maintenance cost, owing to the reduction of interior vaulting pole use quantity, also reduced the flue gas flow resistance moreover.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic three-dimensional structure diagram of a flue device for thermal power generation according to an embodiment of the present invention;
fig. 2 is a schematic front view of a flue device for thermal power generation according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic cross-sectional view taken along line C-C of FIG. 2;
fig. 6 is a schematic cross-sectional view taken along line D-D in fig. 2.
The reference numerals in the figures are denoted respectively by:
1. a support panel;
2. a steel beam;
3. a rib plate;
4. steel frame strips;
5. an inner brace rod;
6. a flapper door;
7. an expansion joint.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
An embodiment of the present invention provides a flue device for thermal power generation, which has a three-dimensional structure as shown in fig. 1, a front view as shown in fig. 2, a cross-sectional view taken along a line a-a in fig. 2 as shown in fig. 3, a cross-sectional view taken along a line B-B in fig. 2 as shown in fig. 4, a cross-sectional view taken along a line C-C in fig. 2 as shown in fig. 5, and a cross-sectional view taken along a line D-D in fig. 2 as shown in fig. 6.
Specifically, the flue device includes: support panel 1, girder steel 2, ribbed plate 3, steel frame strip 4 and interior vaulting pole 5.
Wherein, a plurality of supporting panels 1 are connected to form four flue walls of the flue device;
a plurality of steel frame strips 4 are arranged and fixed on the outer wall surface of each flue wall at intervals along the flow direction of flue gas by a first preset distance, and the steel frame strips 4 on the adjacent outer wall surfaces are connected;
a plurality of steel beams 2 are arranged and fixed on the outer wall surface of each flue wall and between two adjacent steel frame strips 4 at intervals along the vertical direction of the flow direction of flue gas by a second preset distance;
a plurality of rib plates 3 are arranged and fixed on the outer wall surface of each flue wall and between two adjacent steel beams 2 at intervals of a third preset distance along the flow direction of flue gas;
a plurality of inner supporting rods 5 are arranged in the flue device, and a steel frame strip 4 is correspondingly fixed at the position, corresponding to the position, where the end part of each inner supporting rod 5 abuts against the outer wall surface.
Therefore, in the flue device for thermal power generation of the embodiment of the present invention, a plurality of support panels 1 are connected to form four flue walls of the flue device, a plurality of steel frame bars 4 are arranged and fixed on an outer wall surface of each flue wall at intervals of a first preset distance along a flow direction of flue gas, the steel frame bars 4 on adjacent outer wall surfaces are connected, a plurality of steel beams 2 are arranged and fixed between two adjacent steel frame bars 4 at intervals of a second preset distance along a vertical direction of the flow direction of flue gas, a plurality of rib plates 3 are arranged and fixed between two adjacent steel beams 2 at intervals of a third preset distance along the flow direction of flue gas, a plurality of inner support rods 5 are arranged in the flue device, the steel frame bars 4 are correspondingly fixed on the outer wall surface corresponding to the position where an end of each inner support rod 5 abuts, and a part of the steel frame bars 4 is replaced by the steel beams 2 and the rib plates 3, the reduction that can realize steel frame strip 4 use quantity and the 5 use quantity of interior vaulting poles that correspond has not only reduced the inside anticorrosive area that needs of flue device, has reduced the possibility of corroding the seepage between interior vaulting pole 5 and the supporting panel 1, has practiced thrift the operation maintenance cost, moreover because the reduction of the 5 use quantity of interior vaulting pole, has also reduced the flue gas flow resistance.
It should be noted that a damper door 6 and an expansion joint 7 are further provided in the flue device for thermal power generation of the embodiment of the present invention, as shown in fig. 2.
For the baffle door 6, the baffle door 6 penetrates through four flue walls of a flue structure and is supported and arranged in a flue device by utilizing a bracket, the baffle door 6 comprises a plurality of plate leaves, when the baffle door is not used, the direction of the plate leaves is parallel to the flow direction of flue gas, and the flue gas can smoothly pass through the baffle door; when in use, the leaf is in a direction perpendicular to the flow direction of the flue gas, and the flue gas cannot pass through the flapper door 6. Through setting up flapper door 6, can realize when the flue operation breaks down, for example the accident condition such as seepage can't continue the operation, close with the shutoff flue, the flue gas carries out the emission of flue gas through setting up the bypass flue, after the maintenance is accomplished, opens again in order to continue to discharge the flue gas.
For the expansion joint 7, the expansion joint 7 is made of rubber materials and is arranged on the outer surface of the supporting surface 1 at intervals, as shown in fig. 2, the sum of the perimeter of the expansion joint 7 and the side length of the cross section of the flue cut along the line A-A is the same, as the flue gas inside the flue usually has higher temperature, the flue device is easy to generate larger expansion deformation, and the flue is damaged due to the overlarge expansion deformation, so the expansion joint 7 can be used for controlling the expansion deformation of the flue device, and the damage of the flue device due to the overlarge expansion deformation is avoided.
Further, at the time of actual use construction, for the first preset distance, the first preset distance is obtained according to the following calculation formula:
in the formula: s1The reference value is a first preset distance, and the unit is mm; m is1The mass per unit length of a cross section formed by one steel beam 2 and the support panel 1 with the effective length on any flue wall is shown in figure 5 or figure 6, the structural schematic diagram of the cross section is in kg/mm, wherein the effective length is taken as the support surface30 times the thickness of the plate 1; e is the modulus of elasticity of the steel material in N/mm2；I1The section inertia moment of a section formed by one steel beam 2 on any flue wall and the support panel 1 with effective length is in mm4(ii) a f is the set natural frequency in Hz.
For the part far away from the fan and other equipment in the flue, the value of the set natural vibration frequency can be 20 Hz; for the part of the flue adjacent to equipment such as a fan and the like, the value of the set natural vibration frequency can be 40 Hz.
For the second preset distance, the second preset distance is obtained according to the following calculation formula:
in the formula: s2The reference value of the second preset distance is the unit of mm; m is2The unit length mass of a section formed by one rib plate 3 and the support panel 1 with effective length on any flue wall is kg/mm; i is2The section inertia moment of a section formed by one of the rib plates 3 and the support panel 1 with effective length on any flue wall is in mm4。
The first preset distance and the second preset distance can be calculated according to the strength condition, the rigidity condition and the vibration condition respectively to obtain values of the first preset distance and the second preset distance under different conditions, and the minimum value of calculation of the first preset distance and the second preset distance can be obtained during design. Since the method for calculating the first preset distance and the second preset distance according to the strength condition and the stiffness condition is consistent with the prior art, in the embodiment of the present invention, the calculation formulas of the first preset distance and the second preset distance are the first preset distance when the control is performed according to the vibration condition and the second preset distance when the control is performed according to the vibration condition.
It should be noted that the reference value of the first preset distance and the reference value of the second preset distance are theoretical maximum values, and values can be taken according to actual needs in production, which is not specifically limited herein. Regarding the value of the third preset distance, in consideration of the economic efficiency of the engineering, the value of the third preset distance is less than 700mm, and preferably, the value of the third preset distance is 500 mm.
Based on the above, a description is further made below of a flue device for thermal power generation of an embodiment of the present invention:
as for the support panel 1, in the flue device for thermal power generation of the embodiment of the present invention, the support panel 1 functions as a main body of support, and may be formed by connecting four support panels 1.
Further, because the setting of girder steel 2 and rib board 3, the thickness of supporting panel 1 can be 3 ~ 5mm, and the thickness value of supporting panel 1 is less than the thickness value of supporting panel 1 that uses among the prior art, can realize the stable support under the condition that the thickness of supporting panel 1 reduces.
If the thickness of the supporting panel 1 is more than 5mm, the construction amount of the flue device is large, and the economical efficiency is poor; if the thickness of the support panel 1 is less than 3mm, the stack is prone to corrosive leakage.
As for the steel beam 2, in the flue device for thermal power generation of the embodiment of the present invention, the steel beam 2 is a critical component.
In the selection of materials, because girder steel 2 and steel frame strip 4 can be the I-steel, as shown in fig. 4 or fig. 5, compare girder steel 2 and steel frame strip 4, the width of girder steel 2 is less than the width of steel frame strip 4.
Wherein, the plane at the width place of girder steel 2 and steel frame strip 4 is parallel with the planar direction in support panel 1 place, and the width place straight line of girder steel 2 and steel frame strip 4 is parallel with the vertical direction of the flow direction of flue gas.
Because the flue device for thermal power generation of the embodiment of the invention is stressed in the flowing direction of the flue gas, the stress process can be expressed as follows: support panel 1 atress, support panel 1 transmits power for ribbed plate 3, and ribbed plate 3 transmits power for girder steel 2 again, and girder steel 2 transmits power for steelframe frame strip 4 again. Therefore, the steel frame strips 4 are main stress members, the steel beams 2 are secondary stress members, in order to ensure the firmness of the steel beams 2, the width of the steel beams 2 can be smaller than that of the steel frame strips 4, and in the embodiment of the invention, the stable support of the flue device in the flow direction of flue gas can be ensured by using I-shaped steel with different sizes and types.
Further, in the connection mode, the steel beam 2 and the support panel 1 can be fixed in a full welding mode, the steel beam 2 and the steel frame strip 4 can be fixed in a full welding mode, all contact places between workpieces to be welded together are subjected to fusion welding, and the connection stability is ensured.
As for the rib plate 3, in the flue device for thermal power generation of the embodiment of the present invention, the rib plate 3 belongs to a critical component as well as the steel beam 2.
In terms of structural arrangement, on the one hand, since the rib plate 3 is a secondary force-receiving member compared to the steel beam 2, the width of the rib plate 3 is smaller than that of the steel beam 2 in order to secure the firmness of the rib plate 3. Wherein, the width direction of the rib plate 3 is parallel to the width direction of the steel beam 2.
Further, in the connection mode, the rib plates 3 and the support panel 1 can be fixed in a full welding mode, and the steel beams 2 and the rib plates 3 can be fixed in a full welding mode.
It should be noted that the rib plate 3 may be an L-shaped rib plate as shown in fig. 6, or the rib plate 3 may be a T-shaped rib plate to support and fix, and in the flue apparatus for thermal power generation according to the embodiment of the present invention, the shape of the rib plate 3 is not particularly limited.
Regarding the steel frame strips 4 and the inner support rods 5, in the flue device for thermal power generation according to the embodiment of the present invention, the steel frame strips 4 and the inner support rods 5 are both basic members that are supported and fixed.
In order to ensure the firm fixation between the steel frame strip 4 and the support panel 1, the steel frame strip 4 and the support panel 1 can be fixed by full welding.
In order to secure the stability of the flue device for thermal power generation, the ends of the plurality of inner stays 5 are connected to each other to form a triangle, as shown in fig. 1 or 3.
For example, the number of the inner stays 5 may be six, the end of each inner stay 5 abuts against and is welded on the inner panel surface of the support panel surface 1, the adjacent ends of every three inner stays 5 are connected to each other to form a triangle, and support and fix the triangles.
The shape of the inner stay 5 fixed to the inner panel surface of the support panel 1 may be other than a triangle, as long as stable fixation of the support panel surfaces 1 is ensured.
In the actual manufacturing and using process, the flue device for thermal power generation of the embodiment of the invention can be assembled on site, or can be assembled on site in factory, taking the flue structure of a certain 1000MW unit as an example, the support panels 1 are welded and connected with each other to form the main structure of the flue, the thickness of the support panel 1 is selected to be 4mm, a plurality of steel frame bars 4 are fixed on the outer plate surface of each support panel 1 along the flow direction of flue gas at intervals of the calculated first preset distance, and the first preset distance is selected to be 2250 mm; then, a plurality of steel beams 2 are welded and fixed on two adjacent steel frame strips 4 at intervals along the vertical direction of the flow direction of the flue gas by the length of a second preset distance, and are welded and fixed on the outer plate surface of the support panel 1, and the second preset distance is selected to be 2000 mm; welding a plurality of rib plates 3 on two adjacent steel beams 2 at intervals along the flowing direction of the flue gas by a third preset distance, welding and fixing the rib plates on the outer plate surface of the support panel 1, and selecting the third preset distance to be 550 mm; the inner stay bar 5 is fixed on the inner plate surface of the support panel 1 at the position of the steel frame strip 4, and compared with the prior art, the steel consumption can be saved by 30 percent, and the economic benefit is obvious.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A flue apparatus for thermal power generation, the flue apparatus comprising: a supporting panel (1), a steel beam (2), a ribbed plate (3), a steel frame strip (4) and an inner supporting rod (5), wherein,
a plurality of said support panels (1) being connected to form four flue walls of said flue means;
a plurality of steel frame strips (4) are arranged and fixed on the outer wall surface of each flue wall at intervals along the flow direction of flue gas by a first preset distance, and the steel frame strips (4) on the adjacent outer wall surfaces are connected;
a plurality of steel beams (2) are arranged and fixed on the outer wall surface of each flue wall and between two adjacent steel frame strips (4) at intervals along the vertical direction of the flow direction of the flue gas by a second preset distance;
a plurality of rib plates (3) are arranged and fixed on the outer wall surface of each flue wall and between two adjacent steel beams (2) at intervals along the flowing direction of the flue gas at a third preset distance;
a plurality of inner supporting rods (5) are arranged in the flue device, and the steel frame strips (4) are correspondingly fixed at the outer wall surface corresponding to the position where the end part of each inner supporting rod (5) abuts against;
the width of the steel beam (2) is smaller than that of the steel frame strip (4), and the width of the rib plate (3) is smaller than that of the steel beam (2);
the thickness of the supporting panel (1) is 3-5 mm;
the flue device further comprises at least two expansion joints (7), and the at least two expansion joints (7) are arranged on the outer surface of the support panel (1) at intervals.
2. The flue device for thermal power generation according to claim 1, wherein the first preset distance is obtained according to the following calculation formula:
in the formula: s1The reference value of the first preset distance is the unit of mm; m is1The unit length mass of a cross section formed by one of the steel beams (2) on any flue wall and the support panel (1) with the effective length is kg/mm, wherein the effective length is 30 times of the thickness of the support panel (1); e is the modulus of elasticity of the steel material in N/mm2；I1The section inertia moment of a section formed by one of the steel beams (2) on any flue wall and the support panel (1) with effective length is in mm4(ii) a f is the set natural frequency in Hz.
3. The flue device for thermal power generation according to claim 2, wherein the second preset distance is obtained according to the following calculation formula:
in the formula: s2The unit of the reference value of the second preset distance is mm; m is2The mass per unit length of a section formed by one of the rib plates (3) and the support panel (1) with effective length on any flue wall is kg/mm; i is2The section inertia moment of a section formed by one of the rib plates (3) and the support panel (1) with effective length on any flue wall is in mm4。
4. The flue device for thermal power generation of claim 1, wherein the third predetermined distance is less than 700 mm.
5. Flue device for thermal power generation according to claim 1, wherein the rib plate (3) is an L-shaped rib plate or a T-shaped rib plate.
6. The flue device for thermal power generation according to claim 1, wherein ends of a plurality of the inner stays (5) are connected to each other to form a triangle.
7. The flue device for thermal power generation according to claim 1, wherein the steel frame bars (4), the steel beams (2), the rib plates (3) and the support panel (1) are fixed by full welding.
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| CN201810166871.9A CN108534162B (en) | 2018-02-28 | 2018-02-28 | Flue device for thermal power generation |
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| CN201810166871.9A CN108534162B (en) | 2018-02-28 | 2018-02-28 | Flue device for thermal power generation |
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| CA2423371A1 (en) * | 2003-03-26 | 2004-09-26 | Charles Perrault | Chimney with heat resistant anti-oxidant coating |
| CN201826504U (en) * | 2010-10-15 | 2011-05-11 | 周猛 | High-strength gas flue |
| CN202023336U (en) * | 2011-03-29 | 2011-11-02 | 中国电力工程顾问集团东北电力设计院 | External bearing type longitudinal reinforcing rib structure of flue |
| CN203464302U (en) * | 2013-07-31 | 2014-03-05 | 同方环境股份有限公司 | Inclined flue structure |
| CN105258112B (en) * | 2015-11-13 | 2016-08-17 | 江苏绿叶锅炉有限公司 | CFB boiler corner flue and assembling process thereof |
| CN206397065U (en) * | 2016-12-22 | 2017-08-11 | 陕西中河电力工程有限公司 | A kind of computing device of cigarette air channel reinforcing rib |
| CN206817487U (en) * | 2017-05-05 | 2017-12-29 | 中国华电科工集团有限公司 | A kind of novel flue |
| CN206888466U (en) * | 2017-06-29 | 2018-01-16 | 西安西热锅炉环保工程有限公司 | One kind is without internal overarm support rectangle cigarette ducting system |
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