CN203703917U - Low-noise waste heat boiler - Google Patents
Low-noise waste heat boiler Download PDFInfo
- Publication number
- CN203703917U CN203703917U CN201320855927.4U CN201320855927U CN203703917U CN 203703917 U CN203703917 U CN 203703917U CN 201320855927 U CN201320855927 U CN 201320855927U CN 203703917 U CN203703917 U CN 203703917U
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- waste heat
- heat boiler
- low
- sound absorption
- perforated
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Abstract
The utility model discloses a low-noise waste heat boiler which comprises a waste heat boiler body, wherein a chimney is arranged at the top of the waste heat boiler body, a resonant muffler is arranged above the waste heat boiler body connected with the chimney, and sound absorption structures are arranged in sound absorption cavities above a high pressure superheater, a high pressure evaporator, a low pressure superheater, a high pressure economizer, a low pressure evaporator and a deoxygenization evaporator. Compared with the prior art, the low-noise waste heat boiler has the characteristics that the sound absorption cavities formed by perforated plates and liners jointly form a resonant sound absorption body, noise produced in the waste heat boiler is effectively absorbed, and part of the noise can be reflected back to a noise source; therefore, the aims of absorbing the noise in the boiler, reducing the transmission of the noise in the boiler and eliminating vocal cavity resonance in the boiler can be achieved by the sound absorption structures; the resonant muffler is arranged on the waste heat boiler body at the position connected with the chimney, so the outward transmission of the noise of a boiler chamber by the chimney is reduced, and the aim of reducing exhaust noise is achieved.
Description
Technical field
The utility model relates to a kind of waste heat boiler, and especially a kind of low noise waste heat boiler belongs to the noise cancellation technique field of waste heat boiler.
Background technology
At present, in thermal power generation field, because waste heat boiler can obtain the waste heat producing after generating secondary utilization and can improve generating efficiency, therefore waste heat boiler is widely used at power field.Waste heat boiler in use tends to produce a large amount of noises, has a strong impact on periphery resident living, tends to spend a large amount of man power and materials and goes to solve noise problem.Owing to can not find the reason that produces noise, therefore in the prior art, be mainly by give waste heat boiler arranged outside noise-proof wall, noise is closed, adopt the object that can effectively reach in this way noise reduction, but this way not only cost of equipment is higher, and a large amount of noises can make the inner operatic tunes that forms of waste heat boiler resonate and cause device damage, and then increased the maintenance cost of equipment.
Find through further investigation, cause that waste heat boiler noise pollution mainly contains the reason of two aspects, the first produces much noise because being flowing in of flue gas, in the cavity between heat exchanger tube, resonance occurs, its two be the acoustic radiating of waste heat boiler and chimney can propagate waste heat boiler produce noise, therefore research and develop a kind of noise that can absorption boiler inside, reduce the propagation of noise at boiler internal, the waste heat boiler of eliminating the operatic tunes resonance in boiler is necessary very much.
Utility model content
The purpose of this utility model is to provide a kind of low noise waste heat boiler, and the noise that it can absorption boiler inside reduces the propagation of noise at boiler internal, thereby eliminates the operatic tunes resonance in boiler.In addition, this utility model substitutes existing noise-reduction method, has reduced dramatically production and the maintenance cost of equipment.
The technical solution of the utility model: a kind of low noise waste heat boiler, comprise waste heat boiler body, in waste heat boiler body, be provided with successively from top to bottom high-pressure superheater, high pressure evaporator, low-pressure superheater, high-pressure economizer, low pressure evaporator, except oxygen evaporator and condensation water heater, waste heat boiler body top is provided with chimney, the waste heat boiler body top being connected with chimney is provided with resonator muffler, high-pressure superheater, high pressure evaporator, low-pressure superheater, high-pressure economizer, in low pressure evaporator and the sound absorption cavity except oxygen evaporator top, be equipped with perforation sound absorber.
In aforesaid low noise waste heat boiler, described resonator muffler is made up of with the one side sound absorption structure of being located in the waste heat boiler body upper inside walls being connected with chimney the double-sided perforated acoustic board being arranged side by side.
In aforesaid low noise waste heat boiler, described double-sided perforated acoustic board is made up of the double-sided perforated sound absorber stack of 3～8 different resonant frequencies.
In aforesaid low noise waste heat boiler, the spacing between adjacent two double-sided perforated acoustic boards is 0.5～2m, and the height of double-sided perforated acoustic board is 1～5m.
In aforesaid low noise waste heat boiler, double-sided perforated sound absorber and perforation sound absorber include two perforated plates and a liner plate a, perforated plate fits in the both sides of liner plate a, and the both sides that liner plate a is close to perforated plate are trench structure, makes formation sound absorption cavity between perforated plate and liner plate a; One side sound absorption structure comprises a perforated plate and a liner plate b, and the side that liner plate b is close to perforated plate is trench structure, makes formation sound absorption cavity between perforated plate and liner plate b.
In aforesaid low noise waste heat boiler, the thickness of perforated plate is 1～5mm, and the punching rate on perforated plate is 0.1%～1%, and the piercing aperture on perforated plate is 2～30mm; Longitudinal degree of depth of sound absorption cavity is 150mm～300mm.
In aforesaid low noise waste heat boiler, perforation sound absorber is respectively along high-pressure superheater, high pressure evaporator, low-pressure superheater, high-pressure economizer, low pressure evaporator with except the diagonal setting of oxygen evaporator top sound absorption cavity and perpendicular to horizontal plane.
In aforesaid low noise waste heat boiler, be arranged at respectively high-pressure superheater, high pressure evaporator, low-pressure superheater, high-pressure economizer, low pressure evaporator and except aperture, thickness of slab, internal lining pipe length, punching rate and sound absorption cavity depth on the perforation sound absorber in oxygen evaporator top sound absorption cavity all incomplete same.
In aforesaid low noise waste heat boiler, in the perforation on perforated plate, be provided with internal lining pipe, the length of described internal lining pipe is 5～10mm.Internal lining pipe being set actual is in order to increase penetration depth, has both guaranteed equivalent plate thickness, has controlled again the weight of sound absorption structure.Find after deliberation, penetration depth absorbs low-frequency noise to sound absorption structure and produces a very large impact.
Compared with conventional art, the utility model provides a kind of low noise waste heat boiler, by being set on perforated plate, a large amount of apertures and internal lining pipe can effectively avoid traditional sound-absorbing porous material to hold susceptible to plugging problem, the sound absorption cavity that perforated plate and liner form has formed resonance absorber jointly, effectively absorbs the inner noise producing of waste heat boiler and a part of noise can be reflected back to noise source.Therefore, thus can reach by this sound absorption structure being arranged on to the rational position of waste heat boiler absorption boiler inside noise, reduce the object of the operatic tunes resonance of noise in boiler is eliminated in the propagation of boiler internal.
By resonator muffler being set on the waste heat boiler body in chimney junction, reduce, by the outwards furnace chamber noise of propagation of chimney, to reach the object that reduces exhaust noise.
Accompanying drawing explanation
Fig. 1 is the structural representation of low noise waste heat boiler;
Fig. 2 is the structural representation of double-sided perforated acoustic board;
Fig. 3 is the structural representation of double-sided perforated sound absorber;
Fig. 4 is the structural representation of liner plate a;
Fig. 5 is the structural representation of one side perforation sound absorption structure;
Fig. 6 is the structural representation of liner plate b.
Being labeled as in accompanying drawing: 1-waste heat boiler body, 2-high-pressure superheater, 3-high pressure evaporator, 4-low-pressure superheater, 5-high-pressure economizer, 6-low pressure evaporator, 7-is except oxygen evaporator, 8-condensation water heater, 9-chimney, 10-resonator muffler, the 11-sound absorber of boring a hole, 12-double-sided perforated acoustic board, 13-double-sided perforated sound absorber, 14-one side sound absorption structure, 15-perforated plate, 16-liner plate a, the 17-cavity that absorbs sound, 18-internal lining pipe, 19-liner plate b.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
Embodiment 1 of the present utility model:
A kind of low noise waste heat boiler, comprise waste heat boiler body 1, in waste heat boiler body 1, be provided with successively from top to bottom high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6, except oxygen evaporator 7 and condensation water heater 8, waste heat boiler body 1 top is provided with chimney 9, waste heat boiler body 1 top being connected with chimney 9 is provided with resonator muffler 10, high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6 and except being equipped with perforation sound absorber 11 in the sound absorption cavity of oxygen evaporator 7 tops.Described resonator muffler 10 is made up of with the one side sound absorption structure 14 of being located in waste heat boiler body 1 upper inside walls being connected with chimney 9 the double-sided perforated acoustic board 12 being arranged side by side.Described double-sided perforated acoustic board 12 is made up of double-sided perforated sound absorber 13 stacks of 4 different resonant frequencies.Spacing between adjacent two double-sided perforated acoustic boards 12 is 1m, and the height of double-sided perforated acoustic board 12 is 2m.Double-sided perforated sound absorber 13 and perforation sound absorber 11 include two perforated plates 15 and a liner plate a16, perforated plate 15 fits in the both sides of liner plate a16, the both sides that liner plate a16 is close to perforated plate 15 are trench structure, make formation sound absorption cavity 17 between perforated plate 15 and liner plate a16; One side sound absorption structure 14 comprises a perforated plate 15 and a liner plate b19, and the side that liner plate b19 is close to perforated plate 15 is trench structure, makes formation sound absorption cavity 17 between perforated plate 15 and liner plate b19.Perforation sound absorber 11 is respectively along high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6 and diagonal setting and vertical and horizontal face except oxygen evaporator 7 top sound absorption cavitys.Be arranged at respectively high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6 and except aperture, thickness of slab, internal lining pipe length, punching rate and depth of inner cavity on the perforation sound absorber 11 in oxygen evaporator 7 tops sound absorption cavitys all incomplete same.In perforation on perforated plate 15, be provided with internal lining pipe 18.
The perforation sound absorber 11 that is wherein arranged at high-pressure superheater 2 tops of waste heat boiler, the thickness of its perforated plate 15 is 1mm; Aperture on perforated plate 15 is 5mm; Punching rate on perforated plate 15 is 0.25%.The degree of depth of sound absorption cavity 17 is 230mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at high pressure evaporator 3 tops of waste heat boiler, the thickness of its perforated plate 15 is 1mm; Aperture on perforated plate 15 is 4mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 230mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at low-pressure superheater 4 tops of waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 4mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 220mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at high-pressure economizer 5 tops of waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 4mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 200mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at low pressure evaporator 6 tops of waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 3mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 200mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 except oxygen evaporator 7 tops that is wherein arranged at waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 3mm; Punching rate on perforated plate 15 is 0.35%.The degree of depth of sound absorption cavity 17 is 200mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
Wherein the aperture of the double-sided perforated sound absorber 13 of 4 different resonant frequencies of the double-sided perforated acoustic board 12 of composition is followed successively by 13mm, 13mm, 13mm and 12mm; Its perforated acoustic board 15 thicknesss of slab are 2mm; The length of internal lining pipe 18 is 7mm; Punching rate on perforated plate 15 is followed successively by 0.4%, 0.45%, 0.5% and 0.55%; The degree of depth of sound absorption cavity 17 is 200mm; The plate hight of every double-sided perforated sound absorber 13 is 0.5m, and distance between plates is 1m.
Embodiment 2 of the present utility model:
A kind of low noise waste heat boiler, comprise waste heat boiler body 1, in waste heat boiler body 1, be provided with successively from top to bottom high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6, except oxygen evaporator 7 and condensation water heater 8, waste heat boiler body 1 top is provided with chimney 9, waste heat boiler body 1 top being connected with chimney 9 is provided with resonator muffler 10, high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6 and except being equipped with perforation sound absorber 11 in the sound absorption cavity of oxygen evaporator 7 tops.Described resonator muffler 10 is made up of with the one side sound absorption structure 14 of being located in waste heat boiler body 1 upper inside walls being connected with chimney 9 the double-sided perforated acoustic board 12 being arranged side by side.Described double-sided perforated acoustic board 12 is made up of double-sided perforated sound absorber 13 stacks of 8 different resonant frequencies.Spacing between adjacent two double-sided perforated acoustic boards 12 is 1m, and the height of double-sided perforated acoustic board 12 is 4m.Double-sided perforated sound absorber 13 and perforation sound absorber 11 include two perforated plates 15 and a liner plate a16, perforated plate 15 fits in the both sides of liner plate a16, the both sides that liner plate a16 is close to perforated plate 15 are trench structure, make formation sound absorption cavity 17 between perforated plate 15 and liner plate a16; One side sound absorption structure 14 comprises a perforated plate 15 and a liner plate b19, and the side that liner plate b19 is close to perforated plate 15 is trench structure, makes formation sound absorption cavity 17 between perforated plate 15 and liner plate b19.Perforation sound absorber 11 is respectively along high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6 with except the diagonal setting of oxygen evaporator 7 tops sound absorption cavitys and perpendicular to horizontal plane.Be arranged at respectively high-pressure superheater 2, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6 and except aperture, thickness of slab, internal lining pipe length, punching rate and sound absorption cavity depth in the sound absorption structure 11 in oxygen evaporator 7 tops sound absorption cavitys all incomplete same.In perforation on perforated plate 15, be provided with internal lining pipe 18.
The perforation sound absorber 11 that is wherein arranged at high-pressure superheater 2 tops of waste heat boiler, the thickness of its perforated plate 15 is 1mm; Aperture on perforated plate 15 is 2mm; Punching rate on perforated plate 15 is 0.1%.The degree of depth of sound absorption cavity 17 is 300mm.The length of the internal lining pipe 18 that perforation place arranges is 10mm.
The perforation sound absorber 11 that is wherein arranged at high pressure evaporator 3 tops of waste heat boiler, the thickness of its perforated plate 15 is 1mm; Aperture on perforated plate 15 is 4mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 230mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at low-pressure superheater 4 tops of waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 4mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 220mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at high-pressure economizer 5 tops of waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 4mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 200mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 that is wherein arranged at low pressure evaporator 6 tops of waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 3mm; Punching rate on perforated plate 15 is 0.3%.The degree of depth of sound absorption cavity 17 is 200mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
The perforation sound absorber 11 except oxygen evaporator 7 tops that is wherein arranged at waste heat boiler, the thickness of its perforated plate 15 is 2mm; Aperture on perforated plate 15 is 3mm; Punching rate on perforated plate 15 is 0.35%.The degree of depth of sound absorption cavity 17 is 200mm.The length of the internal lining pipe 18 that perforation place arranges is 7mm.
Wherein the aperture of the double-sided perforated sound absorber 13 of 4 different resonant frequencies of the double-sided perforated acoustic board 12 of composition is followed successively by 12mm, 13mm, 14mm and 14mm; Its perforated acoustic board 15 thicknesss of slab are 3mm; The length of internal lining pipe 18 is 8mm; Punching rate on perforated plate 15 is followed successively by 0.4%, 0.5%, 0.45% and 0.55%; The degree of depth of sound absorption cavity 17 is 210mm; The plate hight of every double-sided perforated sound absorber 13 is 0.5m, and distance between plates is 1m.
Operation principle of the present utility model: in high-pressure superheater 2 in waste heat boiler body 1, high pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low pressure evaporator 6, sound absorption cavity except oxygen evaporator 7 and condensation water heater 8 tops, perforation sound absorber 11 is all set, this perforation sound absorber 11 is made up of two perforated plates 15 by certain punching rate and liner plate a16 and forms two sound absorption cavitys 17, this structure is in fact the one application of resonance sound-absorbing structure, and its theoretical foundation is Helmholtz resonator principle.Air column in internal lining pipe 18 on perforated plate 15 does similar piston, has certain acoustic mass, and sound absorption cavity 17 is similar to air spring, has certain elasticity, and the two forms a resonator system.In the time that sound wave reaches aperture, under sound wave effect, air column just produces vibration, and frictional damping when vibration makes a part of acoustic energy be converted to thermal energy consumption to dissipate, and due to the unexpected variation of acoustic impedance, a part of acoustic energy will be reflected back sound source simultaneously.Finally reach the noise of absorption boiler inside, the object of the operatic tunes resonance of minimizing noise in propagation, the elimination boiler of boiler internal.
At the furnace chamber of waste heat boiler and the junction of chimney, waste heat boiler resonator muffler is set, in the time that flue gas flows to chimney from furnace chamber, flue gas is divided into several regions by double-sided perforated acoustic board 12.Under the theory of the principle of Helmholtz resonator is supported, double-sided perforated acoustic board 12 and one side sound absorption structure 14 all can make near sound wave impedance resonant frequency in furnace chamber can not get coupling, and most of acoustic energy is reflected back to sound source, all the other fraction energy continue to propagate, thereby play the effect of silencer, import the object of the noise of chimney to reach minimizing boiler body into.
Claims (9)
1. a low noise waste heat boiler, comprise waste heat boiler body (1), in waste heat boiler body (1), be provided with successively from top to bottom high-pressure superheater (2), high pressure evaporator (3), low-pressure superheater (4), high-pressure economizer (5), low pressure evaporator (6), remove oxygen evaporator (7) and condensation water heater (8), waste heat boiler body (1) top is provided with chimney (9), it is characterized in that: waste heat boiler body (1) top being connected with chimney (9) is provided with resonator muffler (10); In high-pressure superheater (2), high pressure evaporator (3), low-pressure superheater (4), high-pressure economizer (5), low pressure evaporator (6) and the cavity except oxygen evaporator (7) top, be equipped with perforation sound absorber (11).
2. low noise waste heat boiler according to claim 1, is characterized in that: described resonator muffler (10) is made up of with the one side sound absorption structure (14) of being located in waste heat boiler body (1) upper inside walls being connected with chimney (9) the double-sided perforated acoustic board (12) being arranged side by side.
3. low noise waste heat boiler according to claim 2, is characterized in that: described double-sided perforated acoustic board (12) is made up of double-sided perforated sound absorber (13) stack of 3～8 different resonant frequencies.
4. low noise waste heat boiler according to claim 2, is characterized in that: the spacing between adjacent two double-sided perforated acoustic boards (12) is 0.5～2m, and the height of double-sided perforated acoustic board (12) is 1～5m.
5. low noise waste heat boiler according to claim 3, it is characterized in that: double-sided perforated sound absorber (13) and perforation sound absorber (11) include two perforated plates (15) and a liner plate a(16), perforated plate (15) fits in liner plate a(16) both sides, liner plate a(16) both sides of being close to perforated plate (15) are trench structure, make perforated plate (15) and liner plate a(16) between form sound absorption cavity (17); One side sound absorption structure (14) comprises a perforated plate (15) and a liner plate b(19), liner plate b(19) side of being close to perforated plate (15) is trench structure, makes perforated plate (15) and liner plate b(19) and between form sound absorption cavity (17).
6. low noise waste heat boiler according to claim 5, is characterized in that: the thickness of perforated plate (15) is 1～5mm, and the punching rate on perforated plate (15) is 0.1%～1%, and the piercing aperture on perforated plate (15) is 2～30mm; Longitudinal degree of depth of sound absorption cavity (17) is 150mm～300mm.
7. low noise waste heat boiler according to claim 1, is characterized in that: perforation sound absorber (11) is respectively along high-pressure superheater (2), high pressure evaporator (3), low-pressure superheater (4), high-pressure economizer (5), low pressure evaporator (6) with except the diagonal setting of oxygen evaporator (7) top sound absorption cavity and perpendicular to horizontal plane.
8. according to the low noise waste heat boiler described in claim 1 or 7, it is characterized in that: be arranged at respectively high-pressure superheater (2), high pressure evaporator (3), low-pressure superheater (4), high-pressure economizer (5), low pressure evaporator (6) and except aperture, thickness of slab, internal lining pipe length, punching rate and sound absorption cavity depth on the perforation sound absorber (11) in oxygen evaporator (7) top sound absorption cavity all incomplete same.
9. according to the low noise waste heat boiler described in claim 5 or 6, it is characterized in that: in the perforation on perforated plate (15), be provided with internal lining pipe (18), the length of described internal lining pipe (18) is 5～10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320855927.4U CN203703917U (en) | 2013-12-24 | 2013-12-24 | Low-noise waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320855927.4U CN203703917U (en) | 2013-12-24 | 2013-12-24 | Low-noise waste heat boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203703917U true CN203703917U (en) | 2014-07-09 |
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ID=51054352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320855927.4U Withdrawn - After Issue CN203703917U (en) | 2013-12-24 | 2013-12-24 | Low-noise waste heat boiler |
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| Country | Link |
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| CN (1) | CN203703917U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742888A (en) * | 2013-12-24 | 2014-04-23 | 华电重工股份有限公司 | Low-noise waste heat boiler |
-
2013
- 2013-12-24 CN CN201320855927.4U patent/CN203703917U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742888A (en) * | 2013-12-24 | 2014-04-23 | 华电重工股份有限公司 | Low-noise waste heat boiler |
| CN103742888B (en) * | 2013-12-24 | 2016-06-29 | 华电重工股份有限公司 | A kind of Low-noise waste heat boiler |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140709 Effective date of abandoning: 20160629 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |