CN1299082C - Preheater with controllable wind temperature for porcelain clay and methal - Google Patents
Preheater with controllable wind temperature for porcelain clay and methal Download PDFInfo
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- CN1299082C CN1299082C CNB2003101081563A CN200310108156A CN1299082C CN 1299082 C CN1299082 C CN 1299082C CN B2003101081563 A CNB2003101081563 A CN B2003101081563A CN 200310108156 A CN200310108156 A CN 200310108156A CN 1299082 C CN1299082 C CN 1299082C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The present invention belongs to the technical field of heat exchange in heat energy power engineering, which is characterized in that a metal preheating pipe is penetrated through a china clay preheating device and then arranged in a metal casing, and the metal preheating pipe, the china clay preheating device and the metal casing are organically combined into a china clay metal preheater with controllable wind temperature. The present invention has the advantages that combustion conditions are effectively improved, the degree of imperfect combustion can be reduced, and the heat efficiency of furnaces is enhanced; the temperature of flue gases which enter a heat oil steam boiler is controlled, the degree of dust formation at the metal heated surface and erosive wear of particulates is reduced, and the working performance of the whole boiler system is enhanced.
Description
Technical field:
The invention belongs to technical field of heat exchange in the thermal power engineering, it relates to a kind of controlled wind-warm syndrome potter's clay metal preheater.
Background technology:
The especially large-scale wood processing enterprise of domestic building material industry, need conduction oil, steam and hot blast to be used for production technology simultaneously, use hot oil carrier boiler for producing conduction oil, the steam boiler of monomer to produce steam and hot-blast stove production hot blast respectively, this has just caused energy utilization rate low, and use and disperse, be difficult to ratio and regulate Load Distribution, occupation area of equipment is big, the maintenance management expense increases, the wood fragments that produce in the production process, break flour etc. can not get effectively utilizing and environment being caused to a certain degree pollution, and the production cost of enterprise is difficult for reducing.Thereby, development and Design the energy saving and environment friendly deep fat steam hot wind integrated furnace of a kind of deep fat, steam and hot blast three unification, this integrated furnace it with coal as main fuel, wood fragments, break flour etc. are as auxiliary fuel, adopt traveling-grate stoker, the subject matter that it produces in combustion process is that the high-temperature smoke that flows out forms the knot ash, weares and teares and certain burning imperfection degree is arranged metal heated, and this operation to stove can produce adverse influence.Therefore, consider an air preheater is set between knockdown hot blast hot oil carrier boiler and organic heat carrier steam boiler, play purposes such as improving the wearing and tearing of metal heated knot ash of burning and minimizing.Basic demand to this preheater is: air themperature is controlled between lower 150～200 ℃, and good sealing property and certain deashing function are arranged, and can the high-temperature flue gas zone of long-term work about 1200 ℃.
The current air preheater that often uses in industrial production mainly contains metal-air preheater and potter's clay air preheater two classes.Potter's clay air preheater poor thermal conductivity, but can use in the high-temperature flue gas environment for a long time if will need to increase its heat exchange area air preheat to high temperature, makes the structure heaviness, and sealing is poor, easily leaks out and influences the service behaviour of furnace system; Metal-air preheater thermal conductivity and good airproof performance, but can only in middle low-temperature flue gas, use.This two classes preheater has pluses and minuses and service condition separately, but all be not suitable for the service condition of energy saving and environment friendly deep fat steam hot wind integrated furnace, and possess simultaneously potter's clay and metal-air preheater separately the air preheater product of advantage do not detect as yet, therefore, a kind of novel air preheater that can coupling of invention is one of key element of succeeding in developing of this integrated furnace.
Summary of the invention:
In order to satisfy set air preheater specification requirement in the energy saving and environment friendly deep fat steam hot wind integrated furnace, the present invention has conceived a kind of controlled wind-warm syndrome potter's clay metal preheater, it is with designed potter's clay preheating device and the metal economizer bank is arranged array and metal shell organically combines in aggregates, it is high temperature resistant to make it possess the potter's clay preheater, anti-sweep of gases, low and the good characteristics of metal-air preheater sealing thermal conductivity of thermal conductivity, and regulate the flow proportional that flows into the preheater air by means of the damper in the metal shell and control preheat temperature, just in time can satisfy of the requirement of this furnace system to air preheater.
The technical scheme of technical solution problem of the present invention is as follows:
A kind of controlled wind-warm syndrome potter's clay metal preheater, it is characterized in that it comprises potter's clay preheating device 1, metal economizer bank 2 and metal shell 3, its potter's clay preheating device 1 that is installed with metal economizer bank 2 is set in the metal shell 3, wherein potter's clay preheating device 1 is by refractory tube brick 11, upside flame-retardant fibre board 12, the fireproof prefabricated plate 13 of upside, flame-retardant fibre board 14 with holes, the fireproof prefabricated plate 15 of downside of band ash removing opening, the downside flame-retardant fibre board 16 of band ash removing opening is formed jointly, refractory tube brick 11 tops link to each other with the fireproof prefabricated plate 13 of upside, and the below links to each other with the fireproof prefabricated plate 15 of downside of band ash removing opening; Upside flame-retardant fibre board 12 links to each other with the fireproof prefabricated plate 13 of upside; Link to each other with upside flame-retardant fibre board 12 on the fireproof prefabricated plate 13 of upside, link to each other with refractory tube brick 11 down, link to each other with both sides flame-retardant fibre board 14 with holes again; Link to each other with the fireproof prefabricated plate 13 of upside on the flame-retardant fibre board 14 with holes, the fireproof prefabricated plate 15 of downside with the band ash removing opening links to each other down, and the left and right sides links to each other with refractory tube brick 11; Link to each other with refractory tube brick 11 on the fireproof prefabricated plate 15 of downside of band ash removing opening, the downside flame-retardant fibre board 16 with the band ash removing opening links to each other down, again with both sides flame-retardant fibre board 14 with holes) link to each other; The fireproof prefabricated plate 15 of downside with the band ash removing opening on the downside flame-retardant fibre board 16 of band ash removing opening links to each other; Wherein the metal economizer bank 2, both penetrated in each refractory tube brick 11 endoporus that is arranged in array, and both sides link to each other with perforated metal steel plate 34 again; Wherein metal shell 3 is made of jointly metal heat resistant floor 35, the support member 36 of last bellows 31, left bellows 32, right bellows 33, perforated metal steel plate 34, band ash removing opening, lower end, last bellows 31 left side links to each other with left bellows 32 and perforated metal steel plate 34, and the right side links to each other with right bellows 33 top edges; Bellows 32 upper ends, a left side link to each other with last bellows 31 left ends, and the lower end links to each other with the metal heat resistant floor 35 of band ash removing opening, and the right side links to each other with perforated metal steel plate 34; Right bellows 33 upper ends link to each other with last bellows 31, and the inboard links to each other with right side perforated metal steel plate 34, and the lower end links to each other with the metal heat resistant floor 35 of band ash removing opening; Upper end, perforated metal steel plate 34 left sides, both sides links to each other with last bellows 31, and two inboards all link to each other with metal economizer bank 2 two ends, and two outsides link to each other with right bellows 33 with left bellows 32 respectively, and the lower end all links to each other with the metal heat resistant floor 35 of band ash removing opening; Metal heat resistant floor 35 left sides of band ash removing opening link to each other with left bellows 32 and left side perforated metal steel plate 34, and the right side links to each other with right bellows 33 and right side perforated metal steel plate 34; Support member 36 surfaces in the left and right sides link to each other with the metal heat resistant floor 15 of band ash removing opening.
Two kinds of 11 fens I shape refractory tubes of refractory tube brick brick 11a of described potter's clay preheating device 1 and T font refractory tube brick 11b, refractory tube brick 11 is arranged in rectangular array, its left and right sides file of the number of permutations of refractory tube brick 11 is 11, and line is 12 up and down, and the front and back line is 11; Described metal economizer bank 2 also is the cuboid array.
The last bellows 31 of described metal shell 3 are provided with hot-air air outlet 311, upper spacer 312, damper 313, side dividing plate 314, regulate air air port 315, preheated air air port 316; Its left bellows 32 are provided with cold air air inlet 321 and dividing plate 322.
Advantage compared with prior art of the present invention is:
Improve burning condition effectively, can reduce the imperfect combustion degree, improve the thermal efficiency of stove, the temperature that control enters the organic heat carrier steam boiler high-temperature flue gas, reduce the degree of its metal heated knot ash and particle erosive wear, improved the service behaviour of whole furnace system.
Description of drawings:
Potter's clay preheating device 1 schematic diagram in the controlled wind-warm syndrome potter's clay of Fig. 1 metal preheater
The downside flame-retardant fibre board of the fireproof prefabricated plate 16-band of the downside ash removing opening of the fireproof prefabricated plate 14-of 1-potter's clay preheating device 11-refractory tube brick 11a-I shape refractory tube brick 11b-T font refractory tube brick 12-upside flame-retardant fibre board 13-upside flame-retardant fibre board 15-band with holes ash removing opening
2-metal economizer bank
3-metal shell 31-goes up the metal heat resistant floor 36-support member that bellows 311-hot-air air outlet 312-upper spacer 313-damper 314-side dividing plate 315-regulates the right bellows 34-of air air port 316-preheated air air port 32-left side bellows 321-cold air air inlet 322-dividing plate 33-perforated metal steel plate 35-band ash removing opening
Metal economizer bank row array and metal shell is connected and preheater air schematic flow sheet in the controlled wind-warm syndrome potter's clay of Fig. 4 metal preheater
2-metal economizer bank 3-metal shell A-cold air B, B '-adjusting air C, C '-preheated air D-hot-air
The controlled wind-warm syndrome potter's clay of Fig. 5 metal preheater assembling schematic diagram
1-potter's clay preheating device 2-metal economizer bank 3-metal shell
The specific embodiment:
As Fig. 1; Fig. 2; Fig. 3; shown in Figure 4; each root metal economizer bank 2 all penetrates in the refractory tube brick 11 of lining up array; because refractory tube brick 11 is arranged in the cuboid array; so metal economizer bank 2 also is the cuboid array; its up and down circumference all use the fireproof prefabricated plate 13 of upside; fireproof prefabricated plate 15 of the downside of band ash removing opening and the good upside flame-retardant fibre board 12 of heat-proof quality; flame-retardant fibre board 14 with holes; the downside flame-retardant fibre board 16 of band ash removing opening is kept apart; make metal economizer bank 2 directly not contact upside flame-retardant fibre board 12 with high-temperature flue gas with metal shell 3; flame-retardant fibre board 14 with holes; the downside flame-retardant fibre board 16 of band ash removing opening plays heat insulation; high temperature resistant; sealing and the effect of bearing the thermal expansion of buffering refractory brick.By the high-temperature flue gas that combined hot wind-heat oil carrier boiler furnace outlet flows out, when flowing through potter's clay preheating device 1, at first heat is passed to refractory tube brick 11 arrays, pass through metal economizer bank 2 outer walls heat transferred the inside flow air by it again.The air of preheating in fact only contacts with the metal economizer bank 2 of thermal conductivity, good airproof performance, has absorbed heat, has reduced and leaked out and reduce its temperature.Because the air themperature of the preheating that requires is lower 150～200 ℃, so resistant to elevated temperatures potter's clay heat exchange area is little, weight descends; And each root metal economizer bank 2 be in the heat exchange of low-temperature prewarming cross-ventilation in, bulk temperature is not high yet.Cold air A is divided into two-way, one road metal economizer bank 2 of flowing through becomes preheated air C ' to hot-air air outlet 311, another road damper 313 of directly flowing through becomes and regulates air B ' and mix with preheated air C ' to hot-air air outlet 311, finally reaches 150～200 ℃ of hot-air D outlet temperatures of regulation.Preheated air offers hot blast hot oil carrier boiler and is used to improve its burning condition, flow out the high-temperature flue gas of preheater, discharged the part heat, temperature descends to some extent, the part particle is removed in the flue dust, has reduced next step and has entered the degree of organic heat carrier steam boiler to metal heated knot ash and erosive wear.
As Fig. 1, shown in Figure 2, two kinds of 11 fens I shape refractory tubes of refractory tube brick brick 11a in the potter's clay preheating device 1 and T font refractory tube brick 11b, the left part is I shape refractory tube brick 11a, T font refractory tube brick 11b is inserted in its right-hand member hole, T font refractory tube brick 11b right-hand member hole is inserted T font refractory tube brick 11b successively and is formed row, these row refractory tube brick 11 endoporus penetrate a metal economizer bank 2, refractory tube brick 11 is arranged in the cuboid array, each the root metal economizer bank 2 that then penetrates also is the cuboid array, its left and right sides file of refractory tube brick 11 number of permutations is 11, line is 12 up and down, and the front and back line is 11.Form array refractory tube brick 11 its up and down respectively with the fireproof prefabricated plate 13 of upside, the fireproof prefabricated plate 15 of the downside of band ash removing opening links to each other, refractory tube brick 11 left and right sides both ends of the surface link to each other with left and right sides flame-retardant fibre board 14 with holes, the fireproof prefabricated plate 13 of upside links to each other with upside flame-retardant fibre board 12, the fireproof prefabricated plate 15 of downside of band ash removing opening links to each other with the downside flame-retardant fibre board 16 of band ash removing opening, left and right sides flame-retardant fibre board 14 links to each other with left and right sides perforated metal steel plate 34 respectively, upside flame-retardant fibre board 12 links to each other with last bellows 31, the downside flame-retardant fibre board 16 of band ash removing opening links to each other with the metal heat resistant floor 35 of band ash removing opening, and the metal heat resistant floor 35 of band ash removing opening links to each other with left and right sides support member 36.High-temperature flue gas is arranged arrays in flow air with heat transferred at metal economizer bank 2 by it again with heat transferred refractory tube brick 11 arrays.When high-temperature flue gas is flowed through, part soot dust granule thing is owing to refractory tube brick 11 bumps, lose speed, under the effect of gravity, fall into the fireproof prefabricated plate 15 of downside of band ash removing opening, and be eliminated with the metal heat resistant floor 35 of being with ash removing opening by the downside flame-retardant fibre board 16 of band ash removing opening.
As shown in Figure 3, Figure 4, metal shell 3, structure is formed by connecting with left and right sides support member 36 by the perforated metal steel plate 34 of last bellows 31, left bellows 32, right bellows 33, both sides, the metal heat resistant floor 35 of band ash removing opening.Bellows 32 upper ends, a left side link to each other with adjusting air air port 315, the preheated air air port 316 of last bellows 31 left ends, dividing plate 322 plays preheated air C ' and the effect of regulating air B isolated, and cold air A flowed be divided into two backhauls, bellows 32 inboards, a left side link to each other with left side perforated metal steel plate 34, and the lower end of left bellows 32 links to each other with the metal heat resistant floor 35 of band ash removing opening.The structure of last bellows 31 comprises hot-air air outlet 311, damper 313, upper spacer 312 plays preheated air C ' and the effect of regulating air B ' isolated with side dividing plate 314, last bellows 31 left sides link to each other with left bellows 32 and perforated metal steel plate 34, and last bellows 31 right sides link to each other with right bellows 33 top edges.Right bellows 33 upper ends link to each other with last bellows 31, and the inboard links to each other with right side perforated metal steel plate 34, and the lower end links to each other with the metal heat resistant floor 35 of band ash removing opening.The both sides perforated metal steel plate 34 matrix-like pore that distributing, the pore correspondence is connecting metal economizer bank 2 arrays, and perforated metal steel plate 34 upper ends, left side link to each other with last bellows 31, and the outside links to each other with left bellows 32, and the lower end links to each other with the metal heat resistant floor 35 of band ash removing opening; Perforated metal steel plate 34 outsides, right side link to each other with right bellows 33, and the lower end links to each other with the metal heat resistant floor 35 of band ash removing opening.Metal heat resistant floor 35 upper ends of band ash removing opening link to each other with left bellows 32, right bellows 33, both sides perforated metal steel plate 34 respectively, and the lower end links to each other with left and right sides support member 36.The cold air air inlet 321 of cold air A on left bellows 32 is divided into two-way, one the tunnel is that the metal economizer bank 2 (backhaul) of flowing through arrives the preheated air C of right bellows 33, turn back then and flow through metal economizer bank 2 (two return) to left bellows 32, up flow into the preheated air air port 316 of going up in the bellows 31 again, in two heat exchange backhauls, pass through heat convection, absorption of air passes to the heat of metal economizer bank 2 by the refractory tube brick 11 of lining up matrix-like, forms preheated air C ' and flows out from hot-air air outlet 311; Another road flows directly into the adjusting air air port 315 in the bellows 31 for regulating air B, through damper 313 to hot-air air outlet 311.Damper 313 is regulated the ratio of two-way air mass flows, and the preheated air C ' that makes final outflow hot-air air outlet 311 and the mixed hot-air D of adjusting air B ' reach 150～200 ℃ of regulation.
As shown in Figure 5, potter's clay preheating device 1, metal economizer bank 2, metal shell 3 three's organic assembling are become controlled wind-warm syndrome potter's clay metal preheater.Should can improve burning condition effectively by the new preheater of conceiving, can reduce the imperfect combustion degree, improve the thermal efficiency of stove, the temperature that control enters the organic heat carrier steam boiler high-temperature flue gas, reduce the degree of its metal heated knot ash and particle erosive wear, improved the service behaviour of whole furnace system.
Claims (3)
1. controlled wind-warm syndrome potter's clay metal preheater, it is characterized in that it comprises potter's clay preheating device (1), metal economizer bank (2) and metal shell (3), its potter's clay preheating device (1) that is installed with metal economizer bank (2) is set in the metal shell (3), wherein potter's clay preheating device (1) is by refractory tube brick (11), upside flame-retardant fibre board (12), the fireproof prefabricated plate of upside (13), flame-retardant fibre board with holes (14), the fireproof prefabricated plate of downside (15) of band ash removing opening, the downside flame-retardant fibre board (16) of band ash removing opening is common to be formed, refractory tube brick (11) top links to each other with the fireproof prefabricated plate of upside (13), and the below links to each other with the fireproof prefabricated plate of downside (15) of band ash removing opening; Upside flame-retardant fibre board (12) links to each other with the fireproof prefabricated plate of upside (13); The fireproof prefabricated plate of upside (13) is gone up and is linked to each other with upside flame-retardant fibre board (12), links to each other with refractory tube brick (11) down, links to each other with both sides flame-retardant fibre boards with holes (14) again; Flame-retardant fibre board with holes (14) is gone up and is linked to each other with the fireproof prefabricated plate of upside (13), and the fireproof prefabricated plate of downside (15) with the band ash removing opening links to each other down, and the left and right sides links to each other with refractory tube brick (11); The fireproof prefabricated plate of downside (15) of band ash removing opening is gone up and is linked to each other with refractory tube brick (11), and the downside flame-retardant fibre board (16) with the band ash removing opening links to each other down, links to each other with both sides flame-retardant fibre boards with holes (14) again; The downside flame-retardant fibre board (16) of band ash removing opening is gone up with the fireproof prefabricated plate of downside (15) of band ash removing opening and is linked to each other; Wherein metal economizer bank (2) had both penetrated in each refractory tube brick (11) endoporus that is arranged in array, and both sides link to each other with perforated metal steel plate (34) again; Wherein metal shell (3) is made of jointly metal heat resistant floor (35), the support member (36) of last bellows (31), left bellows (32), right bellows (33), perforated metal steel plate (34), band ash removing opening, lower end, last bellows (31) left side links to each other with left bellows (32) and perforated metal steel plate (34), and the right side links to each other with right bellows (33) top edge; Left side bellows (32) upper end links to each other with last bellows (31) left end, and the lower end links to each other with the metal heat resistant floor (35) of band ash removing opening, and the right side links to each other with perforated metal steel plate (34); Right bellows (33) upper end links to each other with last bellows (31), and the inboard links to each other with right side perforated metal steel plate (34), and the lower end links to each other with the metal heat resistant floor (35) of band ash removing opening; Upper end, both sides perforated metal steel plates (34) left side links to each other with last bellows (31), two inboards all link to each other with metal economizer bank (2) two ends, two outsides link to each other with right bellows (33) with left bellows (32) respectively, and the lower end all links to each other with the metal heat resistant floor (35) of band ash removing opening; Metal heat resistant floor (35) left side of band ash removing opening links to each other with left bellows (32) and left side perforated metal steel plate (34), and the right side links to each other with right bellows (33) and right side perforated metal steel plate (34); Left and right sides support member (36) surface links to each other with the metal heat resistant floor (15) of band ash removing opening.
2. controlled wind-warm syndrome potter's clay metal preheater according to claim 1, the refractory tube brick (11) that it is characterized in that described potter's clay preheating device (1) divides two kinds of I shape refractory tube brick (11a) and T font refractory tube bricks (11b), refractory tube brick (11) is arranged in rectangular array, its left and right sides file of the number of permutations of refractory tube brick (11) is 11, line is 12 up and down, and the front and back line is 11; Described metal economizer bank (2) also is the cuboid array.
3. controlled wind-warm syndrome potter's clay metal preheater according to claim 1 and 2, the last bellows (31) that it is characterized in that described metal shell (3) are provided with hot-air air outlet (311), upper spacer (312), damper (313), side dividing plate (314), regulate air air port (315), preheated air air port (316) its left bellows (32) are provided with cold air air inlet (321) and dividing plate (322).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101081563A CN1299082C (en) | 2003-10-24 | 2003-10-24 | Preheater with controllable wind temperature for porcelain clay and methal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101081563A CN1299082C (en) | 2003-10-24 | 2003-10-24 | Preheater with controllable wind temperature for porcelain clay and methal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540262A CN1540262A (en) | 2004-10-27 |
| CN1299082C true CN1299082C (en) | 2007-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101081563A Expired - Fee Related CN1299082C (en) | 2003-10-24 | 2003-10-24 | Preheater with controllable wind temperature for porcelain clay and methal |
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| Country | Link |
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| CN (1) | CN1299082C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503905A (en) * | 1983-12-15 | 1985-03-12 | Gte Products Corporation | Method of making ceramic core heat recuperator |
| US4681157A (en) * | 1984-09-29 | 1987-07-21 | Uhde Gmbh | Crossflow heat exchanger |
| CN2227320Y (en) * | 1995-07-14 | 1996-05-15 | 北京科技大学 | High-efficiency compact type spatial transmission heat exchanger |
| CN2451997Y (en) * | 2000-10-31 | 2001-10-03 | 周一方 | Heat-transfer tube of air preheating device for boiler |
| JP2002081873A (en) * | 2000-09-05 | 2002-03-22 | Mitsui Eng & Shipbuild Co Ltd | Air heater |
-
2003
- 2003-10-24 CN CNB2003101081563A patent/CN1299082C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503905A (en) * | 1983-12-15 | 1985-03-12 | Gte Products Corporation | Method of making ceramic core heat recuperator |
| US4681157A (en) * | 1984-09-29 | 1987-07-21 | Uhde Gmbh | Crossflow heat exchanger |
| CN2227320Y (en) * | 1995-07-14 | 1996-05-15 | 北京科技大学 | High-efficiency compact type spatial transmission heat exchanger |
| JP2002081873A (en) * | 2000-09-05 | 2002-03-22 | Mitsui Eng & Shipbuild Co Ltd | Air heater |
| CN2451997Y (en) * | 2000-10-31 | 2001-10-03 | 周一方 | Heat-transfer tube of air preheating device for boiler |
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| Publication number | Publication date |
|---|---|
| CN1540262A (en) | 2004-10-27 |
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Granted publication date: 20070207 Termination date: 20111024 |