CN202182450U - Steam-water separation type vertical tubular steam boiler burning oil and gas - Google Patents
Steam-water separation type vertical tubular steam boiler burning oil and gas Download PDFInfo
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- CN202182450U CN202182450U CN201120251154XU CN201120251154U CN202182450U CN 202182450 U CN202182450 U CN 202182450U CN 201120251154X U CN201120251154X U CN 201120251154XU CN 201120251154 U CN201120251154 U CN 201120251154U CN 202182450 U CN202182450 U CN 202182450U
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Abstract
The utility model discloses a steam-water separation type vertical tubular steam boiler burning oil and gas, which comprises a heated face pipe, an upper portion annular header, a lower portion annular header, a secondary steam-water separation header and a combustor, wherein the upper portion annular header is communicated with the secondary steam-water separation header through a steam connection pipe, a steam channel is arranged in the secondary steam-water separation header, and a stainless steel wire ball is arranged on the steam channel. Holes are arranged on a traditional primary steam-water separation partition board so that a second multi-hole board is formed, simultaneously sealing boards are additionally welded on two sides, and therefore the traditional simple separation mode is changed, steam can flow in the second multi-hole board, and efficiency of primary separation is improved. During secondary steam-water separation, the stainless steel wire ball replaces a traditional corrugated plate in the secondary steam-water separation header, thereby reducing manufacture difficulty. A steam-water separation backwater device is arranged on the lower portion of the secondary steam-water separation header so as to enable high-temperature water separated from the secondary steam-water separation header to enter the boiler again, thereby according with energy-saving requirements.
Description
Technical field
The utility model belongs to field of boilers, relates generally to a kind of vertical fuel oil, combustion gas automatic steam boiler that improves steam-water separation structure.
Background technology
Boiler is a kind of heating equipment; It is to utilize coal, oil gas, living beings etc. to be fuel; Heat through burning produces is produced steam, hot water or other thermal medium, thereby satisfies all kinds of demands in the social production, the flue gas meeting serious environment pollution that coal burning produces; Harm humans healthy, and combustion technology and flue gas are handled more complicated; The biomass fuel calorific value is low excessively, and boiler arranges that the occupation of land space is bigger; Fuel oil, gas fired-boiler, fuel are easy to carry and use, and the combustion product environmental pollution is minimum; And calorific value is very high, and with respect to the boiler of other fuel type, its volume is very little; It adopts full-automatic combustion apparatus simultaneously, makes its automaticity high, but unmanned.
Small-sized in the past fuel oil, normal horizontal three backhaul wetting back-type multitubular boilers and the novel vertical through-flow water-tube boiler of three backhauls of adopting of gas industry boiler.Compact conformation, volume dispatch from the factory, take up an area of less for a short time, self-contained though horizontal three backhaul wetting back-type multitubular boilers have, the automaticity advantages of higher; But the vertical through-flow water-tube boiler of three novel backhauls is more outstanding than the former in these areas; Therefore in a lot of big cities, exactly because the advantage of the vertical through-flow water pipe steam boiler of novel three backhauls of a large number of users and order this kind of boiler one after another.
Its structure such as Fig. 1, shown in Figure 2 are mainly separated dividing plate A2, heating surface tube A3, upper, annular collection case A4, lower annular collection case A5, combustion chamber A6, burner A7, corrugated sheet A8 and steam trap connection A9 and are formed by secondary carbonated drink disjoint set case A1, carbonated drink.Heating surface tube A3 and burner and furnace bottom are formed combustion chamber A6, and convection section has two backhauls, and first backhaul is the inner ring of heating surface tube A3 and the exhaust gases passes between the centre circle, and second backhaul is the centre circle of heating surface tube A3 and the exhaust gases passes between the outer ring.Arranged carbonated drink separation dividing plate A2 among the upper, annular collection case A4; The steam that produces among the heating surface tube A3 collects in the upper, annular collection case A4; Steam runs into the deadening that carbonated drink is separated dividing plate A2; Separate dividing plate A2 both sides from carbonated drink and detour, use via supplying with the user after the separation of corrugated sheet A8 again through the steam connection tube entering secondary carbonated drink disjoint set case A1 on the upper, annular collection case A4.
But also there is following weak point in the vertical through-flow water pipe steam boiler of above-mentioned novel three backhauls:
1, because the reason of boiler structure; Can't arrange enough carbonated drink separation equipments in this kind of upper boiler annular header; This kind of boiler requires to arrange compact simultaneously; It is big and complicated that the secondary separation device also can not be arranged, thereby cause this kind of boiler steam-water separation effect not good, and other steam boiler of arranging sufficient carbonated drink separation equipment is higher relatively for steam moisture;
2, the steam trap connection in the outside water separator is that high-temperature water is directly drained, and does not add effective utilization, and boiler efficiency is decreased.
The utility model content
In order to overcome above-mentioned defective; The utility model provides a kind of carbonated drink divergence type fuel-firing gas-firing vertical automatic steam boiler, and the vertical automatic steam boiler of this carbonated drink divergence type fuel-firing gas-firing carries out suitable improvement not changing on the integrally-built basis of original boiler to the inside and outside of boiler; The carbonated drink separative efficiency of boiler is improved; Isolated high-temperature water in the steam that emits capable of using has again improved boiler efficiency simultaneously, has also realized energy-saving and emission-reduction.
The utility model for the technical scheme that solves its technical problem and adopt is:
The vertical automatic steam boiler of a kind of carbonated drink divergence type fuel-firing gas-firing; Comprise heating surface tube, upper, annular collection case, lower annular collection case, secondary carbonated drink disjoint set case and burner; Said heating surface tube is communicated with upper, annular collection case and lower annular collection case; Form the combustion chamber between said heating surface tube, upper, annular collection case and the lower annular collection case, said burner is arranged at top, said combustion chamber, and said upper, annular collection case communicates with said secondary carbonated drink disjoint set case through steam connection tube; Have steam channel in the said secondary carbonated drink disjoint set case, said steam channel is provided with the stainless steel pompon.In secondary carbonated drink is separated, use traditional corrugated plating in the secondary carbonated drink disjoint set case instead the stainless steel pompon, manufacture difficulty is reduced.
Steam channel upper edge steam trend in said secondary carbonated drink disjoint set case is fixed with some first porous plates, and said first porous plate is the flat board that offers some through holes, and said stainless steel pompon is filled between adjacent said first porous plate.Some first porous plates not only are used to locate the stainless steel pompon, can also further strengthen steam-water separation effect, adopt the stainless steel pompon to add that the steam-water separation structure of first porous plate can strengthen steam-water separation effect greatly; Through measuring; The secondary carbonated drink disjoint set case front and back steam pressure of the utility model descends very little, proves that the increase of vapor stream dynamic resistance is very little, does not influence boiler operatiopn; Measure steam moisture simultaneously 1～2%, be superior to boiler of the same type greatly.
The top and arranged on left and right sides of said secondary carbonated drink disjoint set case is respectively equipped with steam inlet base and steam (vapor) outlet base; Said upper, annular collection case communicates through the steam inlet base of steam connection tube with said secondary carbonated drink disjoint set case; Middle part in the said secondary carbonated drink disjoint set case is provided with a vertical dividing plate; Sealing and fixing between said dividing plate and the said secondary carbonated drink disjoint set case sidewall; Said dividing plate upper end is higher than between said steam (vapor) outlet base and lower end and the said secondary carbonated drink disjoint set case lower surface and has the gap; Sealing and fixing between said dividing plate upper end and the said secondary carbonated drink disjoint set case sidewall, said first porous plate is horizontally disposed with, some said first porous plates respectively with said secondary carbonated drink disjoint set sidewall and said dividing plate sealing and fixing.
There is the gap between said dividing plate upper end and the said secondary carbonated drink disjoint set case upper surface; Be provided with upper sealing plate, the structure of sealing and fixing is between said dividing plate upper end and the said secondary carbonated drink disjoint set case sidewall: sealing and fixing between said upper sealing plate and said secondary carbonated drink disjoint set case sidewall and the said dividing plate upper end.
Said first porous plate is provided with two.
Said secondary carbonated drink disjoint set case is vertical tubular, and said upper sealing plate is that the plane is semicircular flat board.
Said secondary carbonated drink disjoint set case is vertical tubular, and said first porous plate is that the plane is semicircle and the flat board that offers some through holes.
Said secondary carbonated drink disjoint set case is vertical hollow columnar, and said dividing plate is that top is that rectangle and bottom are the flat board of swallow-tail form.
Be provided with second porous plate in the said upper, annular collection case; Said second porous plate is the flat board that offers some through holes; Said second porous plate is horizontally disposed with; Sealing and fixing between the inner ring sidewall of said second porous plate and upper, annular collection case and the outer ring sidewall, the two ends of said second porous plate all are provided with side seal board, sealing and fixing between the upper surface of said side seal board and said second porous plate and upper, annular collection case; Said second porous plate and two side seal boards constitute a water separator; Said upper, annular collection case has steam (vapor) outlet, and the steam (vapor) outlet of said upper, annular collection case communicates with said secondary carbonated drink disjoint set case through steam connection tube, and a said water separator is positioned at the below of the steam (vapor) outlet of said upper, annular collection case.That is, perforate forms second porous plate on a traditional carbonated drink separation dividing plate, adds weldering two side seal boards simultaneously; Prevent that steam from flowing through from both sides, the second porous plate top; Change traditional simple separation mode, made steam flow to second porous plate, improved the carbonated drink separative efficiency one time.
Be provided with carbonated drink and separate water recovery apparatus, the lower end of said secondary carbonated drink disjoint set case is provided with hot water outlet, and said hot water outlet separates water recovery apparatus and is communicated with said carbonated drink, and said carbonated drink is separated water recovery apparatus and communicated with said lower annular collection case through pipeline.Be provided with carbonated drink at secondary carbonated drink disjoint set lower box part and separate water recovery apparatus; Make the high-temperature water of in secondary carbonated drink disjoint set case, separating get into the lower annular collection case of boiler; Again get in the steam generator system; Simultaneously said carbonated drink is separated water recovery apparatus also has dirt eliminating function, has therefore improved boiler efficiency, meets energy-conservation trend instantly.
The beneficial effect of the utility model is: the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing of the utility model has following advantage:
1, perforate forms second porous plate on a carbonated drink separation of tradition dividing plate, adds weldering two side seal boards simultaneously, has changed traditional simple separation mode, makes steam flow to second porous plate, has improved first separation efficient;
2, in secondary carbonated drink is separated, use the corrugated plating in the traditional secondary carbonated drink disjoint set case instead the stainless steel pompon, manufacture difficulty is reduced; Increase by two first porous plates up and down simultaneously again, strengthened steam-water separation effect greatly, through measuring; Secondary separation front and back steam pressure descends very little, proves that the increase of vapor stream dynamic resistance is very little, does not influence boiler operatiopn; Measure steam moisture simultaneously 1～2%, be superior to boiler of the same type greatly;
3, be provided with carbonated drink at secondary carbonated drink disjoint set lower box part and separate water recovery apparatus; Make the high-temperature water of in secondary carbonated drink disjoint set case, separating get into boiler again; Carbonated drink is separated water recovery apparatus simultaneously also has dirt eliminating function, has therefore improved boiler efficiency, meets energy-conservation trend instantly.
Description of drawings
Fig. 1 is one of conventional water hose automatic steam boiler structural representation;
Fig. 2 is two of a conventional water hose automatic steam boiler structural representation;
Fig. 3 is the vertical automatic steam boiler structural representation of the utility model carbonated drink divergence type fuel-firing gas-firing;
Fig. 4 is the used secondary carbonated drink of the vertical automatic steam boiler of a utility model carbonated drink divergence type fuel-firing gas-firing disjoint set box structure sketch map;
Fig. 5 is the said upper sealing plate structural representation of the utility model;
Fig. 6 is the said first porous plate sketch map of the utility model;
Fig. 7 is the said dividing plate sketch map of the utility model;
Fig. 8 is provided with the water separator structural representation one time in the said upper, annular collection of the utility model case.
The specific embodiment
Embodiment: the vertical automatic steam boiler of a kind of carbonated drink divergence type fuel-firing gas-firing; As shown in Figure 3; Comprise heating surface tube, upper, annular collection case 2, lower annular collection case, secondary carbonated drink disjoint set case 4 and burner 5, said heating surface tube is communicated with upper, annular collection case 2 and lower annular collection case, forms the combustion chamber between said heating surface tube, upper, annular collection case 2 and the lower annular collection case; Said burner 5 is arranged at top, said combustion chamber; Said upper, annular collection case 2 communicates with said secondary carbonated drink disjoint set case 4 through steam connection tube 3, has steam channel in the said secondary carbonated drink disjoint set case 4, and said steam channel is provided with stainless steel pompon 1.In secondary carbonated drink is separated, use traditional corrugated plating in the secondary carbonated drink disjoint set case instead the stainless steel pompon, manufacture difficulty is reduced.
Steam channel upper edge steam trend in said secondary carbonated drink disjoint set case 4 is fixed with some first porous plates 7, and said first porous plate is the flat board that offers some through holes, and said stainless steel pompon 1 is filled between adjacent said first porous plate 7.Some first porous plates not only are used to locate the stainless steel pompon, can also further strengthen steam-water separation effect, adopt the stainless steel pompon to add that the steam-water separation structure of first porous plate can strengthen steam-water separation effect greatly; Through measuring; The secondary carbonated drink disjoint set case front and back steam pressure of the utility model descends very little, proves that the increase of vapor stream dynamic resistance is very little, does not influence boiler operatiopn; Measure steam moisture simultaneously 1～2%, be superior to boiler of the same type greatly.
The top and arranged on left and right sides of said secondary carbonated drink disjoint set case 4 is respectively equipped with steam inlet base 41 and steam (vapor) outlet base 42; Said upper, annular collection case 2 communicates through the steam inlet base 41 of steam connection tube 3 with said secondary carbonated drink disjoint set case 4; Middle parts in the said secondary carbonated drink disjoint set case 4 are provided with a vertical dividing plate 10; Sealing and fixing between said dividing plate 10 and said secondary carbonated drink disjoint set case 4 sidewalls; Said dividing plate upper end is higher than between said steam (vapor) outlet base 42 and lower end and said secondary carbonated drink disjoint set case 4 lower surfaces and has the gap; Sealing and fixing between said dividing plate 10 upper ends and said secondary carbonated drink disjoint set case 4 sidewalls, said first porous plate 7 is horizontally disposed with, some said first porous plates 7 respectively with said secondary carbonated drink disjoint set case 4 sidewalls and said dividing plate 10 sealing and fixing.
There is the gap between said dividing plate 10 upper ends and said secondary carbonated drink disjoint set case 4 upper surfaces; Be provided with upper sealing plate 11, the structure of sealing and fixing is between said dividing plate 10 upper ends and said secondary carbonated drink disjoint set case 4 sidewalls: sealing and fixing between said upper sealing plate 11 and said secondary carbonated drink disjoint set case 4 sidewalls and said dividing plate 10 upper ends.
Said first porous plate 7 is provided with two.
Said secondary carbonated drink disjoint set case 4 is vertical tubular, and said upper sealing plate 11 is that the plane is semicircular flat board, and is as shown in Figure 5.
Said secondary carbonated drink disjoint set case 4 is vertical tubular, and said first porous plate 7 is that the plane is semicircle and the flat board that offers some through holes, and is as shown in Figure 6.
Said secondary carbonated drink disjoint set case 4 is vertical hollow columnar, and said dividing plate 10 is that top is that rectangle and bottom are the flat board of swallow-tail form, and is as shown in Figure 7.
As shown in Figure 8; Be provided with second porous plate 12 in the said upper, annular collection case 2; Said second porous plate 12 is for offering the flat board of some through holes, and said second porous plate is horizontally disposed with, sealing and fixing between the inner ring sidewall of said second porous plate 12 and upper, annular collection case 2 and the outer ring sidewall; The two ends of said second porous plate 12 all are provided with side seal board 13; Sealing and fixing between the upper surface of said side seal board 13 and said second porous plate 12 and upper, annular collection case 2, said second porous plate 12 and two side seal boards 13 constitute a water separator, and said upper, annular collection case 2 has steam (vapor) outlet; The steam (vapor) outlet of said upper, annular collection case 2 communicates with said secondary carbonated drink disjoint set case 4 through steam connection tube 3, and a said water separator is positioned at the below of the steam (vapor) outlet of said upper, annular collection case 4.That is, perforate forms second porous plate on a traditional carbonated drink separation dividing plate, adds weldering two side seal boards simultaneously; Prevent that steam from flowing through from both sides, the second porous plate top; Change traditional simple separation mode, made steam flow to second porous plate, improved the carbonated drink separative efficiency one time.
Be provided with carbonated drink and separate water recovery apparatus 6, the lower end of said secondary carbonated drink disjoint set case 4 is provided with hot water outlet, and said hot water outlet separates water recovery apparatus and is communicated with said carbonated drink, and said carbonated drink is separated water recovery apparatus and communicated with said lower annular collection case through pipeline.Be provided with carbonated drink at secondary carbonated drink disjoint set lower box part and separate water recovery apparatus; Make the high-temperature water of in secondary carbonated drink disjoint set case, separating get into the lower annular collection case of boiler; Again get in the steam generator system; Simultaneously said carbonated drink is separated water recovery apparatus also has dirt eliminating function, has therefore improved boiler efficiency, meets energy-conservation trend instantly.
Claims (10)
1. vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing; Comprise heating surface tube, upper, annular collection case (2), lower annular collection case, secondary carbonated drink disjoint set case (4) and burner (5); Said heating surface tube is communicated with upper, annular collection case (2) and lower annular collection case; Form the combustion chamber between said heating surface tube, upper, annular collection case (2) and the lower annular collection case; Said burner (5) is arranged at top, said combustion chamber; Said upper, annular collection case (2) communicates with said secondary carbonated drink disjoint set case (4) through steam connection tube (3), it is characterized in that: have steam channel in the said secondary carbonated drink disjoint set case (4), said steam channel is provided with stainless steel pompon (1).
2. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 1; It is characterized in that: the steam channel upper edge steam trend in said secondary carbonated drink disjoint set case (4) is fixed with some first porous plates (7); Said first porous plate is the flat board that offers some through holes, and said stainless steel pompon (1) is filled between adjacent said first porous plate (7).
3. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 2; It is characterized in that: the top and arranged on left and right sides of said secondary carbonated drink disjoint set case (4) is respectively equipped with steam inlet base (41) and steam (vapor) outlet base (42); Said upper, annular collection case (2) communicates with the steam inlet base (41) of said secondary carbonated drink disjoint set case (4) through steam connection tube (3); Middle part in the said secondary carbonated drink disjoint set case (4) is provided with a vertical dividing plate (10); Sealing and fixing between said dividing plate (10) and said secondary carbonated drink disjoint set case (4) sidewall; Said dividing plate upper end is higher than between said steam (vapor) outlet base (42) and lower end and said secondary carbonated drink disjoint set case (4) lower surface and has the gap; Sealing and fixing between said dividing plate (10) upper end and said secondary carbonated drink disjoint set case (4) sidewall, said first porous plate (7) is horizontally disposed with, some said first porous plates (7) respectively with said secondary carbonated drink disjoint set case (4) sidewall and said dividing plate (10) sealing and fixing.
4. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 3; It is characterized in that: have the gap between said dividing plate (10) upper end and said secondary carbonated drink disjoint set case (4) upper surface; Be provided with upper sealing plate (11), the structure of sealing and fixing is between said dividing plate (10) upper end and said secondary carbonated drink disjoint set case (4) sidewall: sealing and fixing between said upper sealing plate (11) and said secondary carbonated drink disjoint set case (4) sidewall and said dividing plate (10) upper end.
5. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 3, it is characterized in that: said first porous plate (7) is provided with two.
6. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 4, it is characterized in that: said secondary carbonated drink disjoint set case (4) is vertical tubular, and said upper sealing plate (11) is that the plane is semicircular flat board.
7. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 3 is characterized in that: said secondary carbonated drink disjoint set case (4) is vertical tubular, and said first porous plate (7) is that the plane is semicircle and the flat board that offers some through holes.
8. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 3, it is characterized in that: said secondary carbonated drink disjoint set case (4) is vertical hollow columnar, and said dividing plate (10) is that top is that rectangle and bottom are the flat board of swallow-tail form.
9. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 1; It is characterized in that: be provided with second porous plate (12) in the said upper, annular collection case (2); Said second porous plate (12) is for offering the flat board of some through holes; Said second porous plate is horizontally disposed with; Sealing and fixing between the inner ring sidewall of said second porous plate (12) and upper, annular collection case (2) and the outer ring sidewall, the two ends of said second porous plate (12) all are provided with side seal board (13), sealing and fixing between the upper surface of said side seal board (13) and said second porous plate (12) and upper, annular collection case (2); Said second porous plate (12) and two side seal boards (13) constitute a water separator; Said upper, annular collection case (2) has steam (vapor) outlet, and the steam (vapor) outlet of said upper, annular collection case (2) communicates with said secondary carbonated drink disjoint set case (4) through steam connection tube (3), and a said water separator is positioned at the below of the steam (vapor) outlet of said upper, annular collection case (4).
10. the vertical automatic steam boiler of carbonated drink divergence type fuel-firing gas-firing according to claim 1; It is characterized in that: be provided with carbonated drink and separate water recovery apparatus (6); The lower end of said secondary carbonated drink disjoint set case (4) is provided with hot water outlet; Said hot water outlet separates water recovery apparatus and is communicated with said carbonated drink, said carbonated drink is separated water recovery apparatus and communicated with said lower annular collection case through pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120251154XU CN202182450U (en) | 2011-07-15 | 2011-07-15 | Steam-water separation type vertical tubular steam boiler burning oil and gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120251154XU CN202182450U (en) | 2011-07-15 | 2011-07-15 | Steam-water separation type vertical tubular steam boiler burning oil and gas |
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| Publication Number | Publication Date |
|---|---|
| CN202182450U true CN202182450U (en) | 2012-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120251154XU Withdrawn - After Issue CN202182450U (en) | 2011-07-15 | 2011-07-15 | Steam-water separation type vertical tubular steam boiler burning oil and gas |
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| Country | Link |
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| CN (1) | CN202182450U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878544A (en) * | 2011-07-15 | 2013-01-16 | 大震锅炉工业（昆山）有限公司 | Steam-water separation type vertical oil-gas fired once-through steam boiler |
| CN103604109A (en) * | 2011-07-15 | 2014-02-26 | 大震锅炉工业（昆山）有限公司 | Steam-water separation type fuel-gas vertical straight-flow steam boiler |
-
2011
- 2011-07-15 CN CN201120251154XU patent/CN202182450U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878544A (en) * | 2011-07-15 | 2013-01-16 | 大震锅炉工业（昆山）有限公司 | Steam-water separation type vertical oil-gas fired once-through steam boiler |
| CN103604109A (en) * | 2011-07-15 | 2014-02-26 | 大震锅炉工业（昆山）有限公司 | Steam-water separation type fuel-gas vertical straight-flow steam boiler |
| CN103604109B (en) * | 2011-07-15 | 2015-03-04 | 大震锅炉工业（昆山）有限公司 | Steam-water separation type fuel-gas vertical straight-flow steam boiler |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120404 Effective date of abandoning: 20140423 |
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| RGAV | Abandon patent right to avoid regrant |