CN107559810B - Vertical full-premix gas steam or hot water boiler - Google Patents
Vertical full-premix gas steam or hot water boiler Download PDFInfo
- Publication number
- CN107559810B CN107559810B CN201710795704.6A CN201710795704A CN107559810B CN 107559810 B CN107559810 B CN 107559810B CN 201710795704 A CN201710795704 A CN 201710795704A CN 107559810 B CN107559810 B CN 107559810B
- Authority
- CN
- China
- Prior art keywords
- racket
- vertical
- hearth
- hot water
- boiler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000000779 smoke Substances 0.000 claims abstract description 77
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000007599 discharging Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000013461 design Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Combustion Of Fluid Fuel (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
The invention relates to a vertical full-premix gas steam or hot water boiler, which comprises a full-premix burner (1) transversely connected on a vertical boiler shell (10) in a penetrating way, wherein the full-premix burner (1) comprises a racket-shaped front-section handle hearth (2) and a racket-shaped rear-section racket surface hearth (3), the racket-shaped front-section handle hearth (2) is positioned at the outer side of the vertical boiler shell (10), the racket-shaped rear-section racket surface hearth (3) is positioned in the vertical boiler shell (10), the top of a two-return straight smoke pipe (4) which is vertically arranged is communicated with the racket-shaped rear-section racket surface hearth (3), and the bottom of the two-return straight smoke pipe (4) is communicated with a bottom smoke box (5). The vertical full-premix gas steam or hot water boiler has compact structure and high heat efficiency.
Description
Technical Field
The invention relates to a boiler, in particular to a vertical boiler adopting a full-premixing low-nitrogen combustion technology.
Background
At present, the unit output value energy consumption of China is 2.3 times of the average world level, and the unit energy consumption of main energy-consuming products is 40% higher than the advanced foreign level; the energy consumption of each dollar of GNP created in China is 4.97 times of Germany, 4.43 times of Japan, 2.1 times of America and 1.65 times of India, which is one of the important reasons for the rising of the enterprise cost and poor economic benefit. According to investigation, the consumption of industrial product energy and raw materials in China accounts for about 75% of the production cost of enterprises, and if one percentage point is reduced, more than 100 hundred million yuan of benefits can be obtained.
On the one hand, the development speed of petroleum and natural gas is greatly improved in the last twenty years, and the national restrictions of fuel oil and natural gas in large and medium-sized cities are canceled; on the other hand, with the enhancement of global environmental awareness, national economy of China is rapidly developed, the living standard of people is continuously improved, and China adjusts the fuel policy, so that the government starts to encourage public enterprises and public institutions to burn oil products or natural gas in order to improve the environmental pollution and the atmospheric quality of large and medium-sized cities, and the development of the fuel oil and gas boiler is greatly accelerated. In addition, in recent years, the national NOx emission requirements of gas boilers are more and more stringent, the emission standards are from 400mg/m3 to 150mg/m3, to 80mg/m3, even part of cities and regions directly limit the standards to international first-class standards of not more than 30mg/m3, and the whole standard change only takes 2-3 years, so that the national urgent requirements on low nitrogen emission of the gas boilers are met, and the boilers meeting the low nitrogen emission are generated.
At present, the mainstream low-nitrogen technology reaching below 30mg/m3 mainly comprises two types, namely a flue gas recirculation system with sectional combustion; the other is to adopt a full premix low nitrogen combustion technology. The two technologies have advantages and disadvantages, and in general, the small boiler is more suitable for adopting a full premix low nitrogen combustion technology; however, the conventional horizontal fire tube boiler is not compact in structural arrangement and large in size; and the energy efficiency utilization is not high, and the energy saving effect is not ideal.
Disclosure of Invention
The invention aims to overcome the defects and provide the vertical full-premix gas steam or hot water boiler which is compact in structure and high in heat efficiency.
The purpose of the invention is realized in the following way:
a vertical full-premix gas steam or hot water boiler, the boiler includes the full premix combustor of horizontal cross-under on vertical pot shell, the full premix combustor includes racket shape anterior segment handle furnace and racket shape back end face furnace, and racket shape anterior segment handle furnace is located the outside of vertical pot shell, and racket shape back end face furnace is located the inside of vertical pot shell, and the top of the straight tobacco pipe of two return strokes of vertical setting is linked together with racket shape back end face furnace, and the bottom of the straight tobacco pipe of two return strokes is linked together with bottom smoke box.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein a racket-shaped rear-section racket surface hearth is transversely arranged, and two vertically arranged return straight smoke pipes are arranged at 90 degrees with the racket-shaped rear-section racket surface hearth.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein an annular flue is arranged on the outer wall of a vertical boiler shell, the annular flue is communicated with a bottom smoke box through a three-return bent smoke pipe, an energy saver is arranged on the outer wall of the vertical boiler shell, the energy saver is positioned below the annular flue, a smoke discharging and collecting channel is vertically arranged on the outer wall of the vertical boiler shell, a gas medium inlet of the energy saver is communicated with the annular flue, and a gas medium outlet of the energy saver is communicated with the smoke discharging and collecting channel; the liquid medium outlet of the energy-saving device is communicated into the vertical pot shell.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein a cooling water jacket is wrapped outside a racket-shaped front-section handle hearth.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein a two-return straight smoke pipe and a three-return bent smoke pipe are full-thread smoke pipes.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein three return bent smoke pipes are arranged around two return straight smoke pipes.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein the energy saver is a spiral fin tube energy saver.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein a heat preservation outer cladding is wrapped outside a vertical boiler shell.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein a bottom smoke box access door is arranged on the wall of a bottom smoke box, and a hearth explosion-proof door communicated with a racket-shaped rear-section racket-surface hearth is inserted on the wall of a vertical boiler shell.
The invention relates to a vertical full-premix gas steam or hot water boiler, wherein a vertical boiler shell is arranged on a base.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a brand new hearth structure, namely a racket-shaped hearth structure; the structure is characterized in that a hearth is divided into two sections, the front section is a racket-shaped racket handle part, namely a racket-shaped front section handle hearth, and the front section hearth is arranged outside a boiler barrel of a vertical boiler shell and is cooled by a water jacket; the rear section is a racket-shaped racket surface part, namely a racket-shaped rear section racket surface hearth, the rear section hearth is of a cylindrical structure and is coaxially arranged with the vertical boiler shell, the front section hearth enters through the cylindrical side surface of the rear section hearth, and the two return straight smoke pipes are all arranged on the cylindrical bottom surface tube plate of the rear section hearth, so that the diameter of the rear section hearth can be adjusted at will, and the two return smoke pipes are arranged as much as possible; in addition, the hearth and the two return smoke pipes form an included angle of 90 degrees, so that the length of the two return smoke pipes can be randomly adjusted; the application of the structure ensures that the size of the hearth and the number of the two-pass smoke pipe are not limited, and the low flow resistance, the large section and the small size are possible; the application of the structure increases the flow section of the high-temperature convection zone, namely the two-return straight smoke pipe, reduces the flow velocity, greatly solves the problem of the adaptation of the boiler and the full-premix burner, and ensures that the boiler structure is more compact while meeting the full-premix combustion characteristics and reducing the smoke temperature.
In addition, the spiral finned tube energy-saving device and the smoke discharging collecting channel are both arranged under the racket-shaped front-section handle hearth, so that the front-section hearth which is originally protruded outside the boiler barrel is greatly saved, and the overall layout of the boiler is more compact through the integrated design;
meanwhile, the low water capacity design is realized by adopting the structures of the vertical pot shell and the three-return bent smoke tube. Firstly, a vertical pot shell design is adopted, and a steam-water separation space is designed at the upper part of a vertical pot shell barrel, so that the diameter of the pot shell barrel is greatly reduced; and secondly, by utilizing the three-return-stroke smoke pipe structure, the three-return-stroke smoke pipe does not discharge smoke from the pipe plate, but discharges smoke from the periphery of the pot shell body, so that the diameter of the pot shell body is greatly reduced. The use of these two structures makes it possible to have a small water capacity. Through measurement and calculation, the water capacity of the fire tube boiler with the horizontal internal combustion structure similar to WNS is about 40-50%.
The application of the small-diameter pot shell can reduce heat dissipation loss by reducing the hot surface on one hand; on the other hand, the starting speed of the boiler is accelerated along with the reduction of the water capacity, and the boiler is particularly suitable for occasions such as hotels, guesthouses, schools running intermittently, small factories running for half a day and the like.
Finally, the two-three return smoke pipes of the boiler adopt all-thread smoke pipes for enhancing heat transfer, and the smoke resistance is greatly reduced by adopting a multi-short smoke pipe structure while enhancing heat transfer in the smoke pipe; the energy-saving device adopts a spiral fin tube structure with an expanded heating surface, and the design of low flow velocity and large expanded heating surface greatly reduces the design of smoke discharging temperature and smoke resistance. In addition, the flue gas of the energy-saving device flows from top to bottom, and water flows from bottom to top, so that the pure countercurrent arrangement is adopted while the gas accumulation is prevented, and the lower exhaust gas temperature is ensured;
according to design calculation, the boiler provided by the invention has the advantages that the exhaust temperature of the steam boiler is reduced to 60 ℃, and the exhaust temperature of the hot water boiler is reduced to +15 ℃, so that the design value of the thermal efficiency of the boiler is not lower than 96%.
Drawings
FIG. 1 is a schematic elevational cross-sectional view of a vertical fully premixed gas steam or hot water boiler according to the present invention.
FIG. 2 is a schematic view of the structure of a vertical full premix gas steam or hot water boiler according to the present invention when used as a steam boiler.
FIG. 3 is a schematic view of the vertical full premix gas steam or hot water boiler according to the present invention when used as a hot water boiler.
FIG. 4 is a schematic top view of a vertical fully premixed gas steam or hot water boiler according to the present invention.
Wherein:
the full premix burner comprises a full premix burner 1, a racket-shaped front section handle hearth 2, a racket-shaped rear section racket surface hearth 3, a two-return straight smoke pipe 4, a bottom smoke box 5, a three-return bent smoke pipe 6, an annular flue 7, an energy economizer 8, a smoke discharging collecting channel 9, a vertical pot shell 10, a hearth explosion-proof door 11, a heat insulation outer cover 12, a bottom smoke box access door 13 and a base 14.
Detailed Description
Referring to fig. 1-4, the invention relates to a vertical full premix gas steam or hot water boiler, the boiler comprises a full premix burner 1 transversely connected on a vertical boiler shell 10 in a penetrating way, the full premix burner 1 comprises a racket-shaped front section handle hearth 2 and a racket-shaped rear section racket surface hearth 3, the racket-shaped front section handle hearth 2 is positioned on the outer side of the vertical boiler shell 10, a cooling water jacket is wrapped outside the racket-shaped front section handle hearth 2, the racket-shaped rear section racket surface hearth 3 is positioned in the vertical boiler shell 10, the top of a two-return straight smoke pipe 4 vertically arranged is communicated with the racket-shaped rear section racket surface hearth 3, and the bottom of the two-return straight smoke pipe 4 is communicated with a bottom smoke box 5; the racket-shaped rear section racket surface hearth 3 is transversely arranged, and the two return straight smoke pipes 4 which are vertically arranged are arranged at 90 degrees with the racket-shaped rear section racket surface hearth 3; the design has the advantages that: except that the hearth is horizontally arranged, all heating surfaces are vertically arranged; thereby being convenient for the discharge of condensed water in flue gas, simultaneously being beneficial to the upward expansion of the whole equipment and effectively releasing the expansion stress.
An annular flue 7 is arranged on the outer wall of the vertical pot shell 10, the annular flue 7 is communicated with the bottom smoke box 5 through a three-return bent smoke pipe 6, an energy saver 8 is arranged on the outer wall of the vertical pot shell 10, the energy saver 8 is positioned below the annular flue 7, a smoke discharging and collecting channel 9 is vertically arranged on the outer wall of the vertical pot shell 10, a gas medium inlet of the energy saver 8 is communicated with the annular flue 7, and a gas medium outlet is communicated with the smoke discharging and collecting channel 9; the liquid medium outlet of the energy saver 8 is communicated into the vertical pot shell 10;
further, the two-return straight smoke pipe 4 and the three-return bent smoke pipe 6 are full-thread smoke pipes;
further, the three-return bent smoke pipe 6 is arranged around the two-return straight smoke pipe 4;
further, the energy economizer 8 is a spiral fin tube energy economizer, and the high-temperature tail gas is blown through fins of the spiral fin tube energy economizer to exchange heat with water in the tube;
further, the vertical pot shell 10 is wrapped with a heat-insulating outer wrapping layer 12;
further, a bottom smoke box access door 13 is arranged on the wall of the bottom smoke box 5, and a hearth explosion door communicated with the racket-shaped rear-section racket surface hearth 3 is inserted on the shell wall of the vertical pot shell 10;
further, the vertical pot shell 10 is placed on the base 14.
When in use, the liquid medium inlet of the energy saver 8 is communicated with a water source; the high-temperature tail gas after being combusted by the full premix burner 1 enters the bottom smoke box 5 through the two-pass straight smoke pipe 4, enters the annular smoke channel 7 from the bottom smoke box 5 through the three-pass bent smoke pipe 6, is led into the smoke discharging collecting channel 9 through the energy saver 8, is connected into an external chimney for discharging, and exchanges heat with water entering the vertical pot shell 10 through the energy saver 8 after entering energy saving, so that the preheating of the water is completed, and the heat efficiency is greatly improved;
in addition: it should be noted that the above embodiment is only one of the optimization schemes of this patent, and any modification or improvement made by those skilled in the art according to the above concepts is within the scope of this patent.
Claims (8)
1. A vertical full premix gas steam or hot water boiler, characterized in that: the boiler comprises a full premix burner (1) transversely connected to a vertical boiler shell (10) in a penetrating way, the full premix burner (1) comprises a racket-shaped front section handle hearth (2) and a racket-shaped rear section racket surface hearth (3), the racket-shaped front section handle hearth (2) is positioned on the outer side of the vertical boiler shell (10), the racket-shaped rear section racket surface hearth (3) is positioned in the vertical boiler shell (10), the top of a two-return straight smoke pipe (4) which is vertically arranged is communicated with the racket-shaped rear section racket surface hearth (3), and the bottom of the two-return straight smoke pipe (4) is communicated with a bottom smoke box (5);
the racket-shaped rear section racket surface hearth (3) is transversely arranged, and the two return straight smoke pipes (4) which are vertically arranged are arranged at 90 degrees with the racket-shaped rear section racket surface hearth (3);
an annular flue (7) is arranged on the outer wall of the vertical pot shell (10), the annular flue (7) is communicated with a bottom smoke box (5) through a three-return bent smoke pipe (6), an energy saver (8) is arranged on the outer wall of the vertical pot shell (10), the energy saver (8) is positioned below the annular flue (7), a smoke discharging and collecting channel (9) is vertically arranged on the outer wall of the vertical pot shell (10), a gas medium inlet of the energy saver (8) is communicated with the annular flue (7), and a gas medium outlet is communicated with the smoke discharging and collecting channel (9); the liquid medium outlet of the energy economizer (8) is communicated into the vertical pot shell (10).
2. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: and a cooling water jacket is wrapped outside the racket-shaped front section handle hearth (2).
3. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: the two-return straight smoke pipe (4) and the three-return bent smoke pipe (6) are all-thread smoke pipes.
4. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: the three-return bent smoke pipe (6) is arranged around the two-return straight smoke pipe (4).
5. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: the energy economizer (8) is a spiral fin tube energy economizer.
6. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: the vertical pot shell (10) is wrapped with a heat-insulating outer wrapping layer (12).
7. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: the bottom smoke box (5) is provided with a bottom smoke box access door (13) on the wall, and a hearth explosion-proof door (11) communicated with the racket-shaped rear-section racket-surface hearth (3) is inserted on the wall of the vertical pot shell (10).
8. A vertical full premix gas steam or hot water boiler as in claim 1, wherein: the vertical pot shell (10) is arranged on the base (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710795704.6A CN107559810B (en) | 2017-09-06 | 2017-09-06 | Vertical full-premix gas steam or hot water boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710795704.6A CN107559810B (en) | 2017-09-06 | 2017-09-06 | Vertical full-premix gas steam or hot water boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107559810A CN107559810A (en) | 2018-01-09 |
| CN107559810B true CN107559810B (en) | 2024-03-19 |
Family
ID=60979298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710795704.6A Active CN107559810B (en) | 2017-09-06 | 2017-09-06 | Vertical full-premix gas steam or hot water boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107559810B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887032A (en) * | 2019-09-20 | 2020-03-17 | 江苏双良锅炉有限公司 | Natural gas cold flame combustion horizontal fire tube steam boiler |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936520A (en) * | 2010-08-16 | 2011-01-05 | 江苏双良锅炉有限公司 | Horizontal type oil-gas condensing steam boiler with energy saver and condenser arranged outside independently |
| CN203615313U (en) * | 2013-09-29 | 2014-05-28 | 太康县银宇锅炉制造有限公司 | LHH-type vertical-type multi-pass steam boiler |
| CN204880674U (en) * | 2015-07-28 | 2015-12-16 | 河北巨能锅炉制造有限公司 | Living beings whirlwind gasification boiler |
| CN205332212U (en) * | 2016-02-17 | 2016-06-22 | 北京葆蓝科技有限公司 | Low nitrogen fine copper boiler of full premix of four return stroke structures |
| CN105864779A (en) * | 2016-04-29 | 2016-08-17 | 哈尔滨理工大学 | Novel efficient biomass hot-water boiler |
| CN107023822A (en) * | 2016-01-29 | 2017-08-08 | 扬州金诚锅炉有限公司 | Vertical smoke tube formula biomass boiler |
| CN207196469U (en) * | 2017-09-06 | 2018-04-06 | 江苏双良锅炉有限公司 | A kind of vertical fully pre-mixing gas combustion steam or hot-water boiler |
-
2017
- 2017-09-06 CN CN201710795704.6A patent/CN107559810B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936520A (en) * | 2010-08-16 | 2011-01-05 | 江苏双良锅炉有限公司 | Horizontal type oil-gas condensing steam boiler with energy saver and condenser arranged outside independently |
| CN203615313U (en) * | 2013-09-29 | 2014-05-28 | 太康县银宇锅炉制造有限公司 | LHH-type vertical-type multi-pass steam boiler |
| CN204880674U (en) * | 2015-07-28 | 2015-12-16 | 河北巨能锅炉制造有限公司 | Living beings whirlwind gasification boiler |
| CN107023822A (en) * | 2016-01-29 | 2017-08-08 | 扬州金诚锅炉有限公司 | Vertical smoke tube formula biomass boiler |
| CN205332212U (en) * | 2016-02-17 | 2016-06-22 | 北京葆蓝科技有限公司 | Low nitrogen fine copper boiler of full premix of four return stroke structures |
| CN105864779A (en) * | 2016-04-29 | 2016-08-17 | 哈尔滨理工大学 | Novel efficient biomass hot-water boiler |
| CN207196469U (en) * | 2017-09-06 | 2018-04-06 | 江苏双良锅炉有限公司 | A kind of vertical fully pre-mixing gas combustion steam or hot-water boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107559810A (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202747320U (en) | Air cooling type efficient fuel or gas condensing boiler | |
| CN203454382U (en) | Water tube membrane type wall structural reversal chamber water-cooling wet-back type fire tube hot-water boiler | |
| CN206073441U (en) | Forced circulation fuel-firing gas-firing pipe hot water boiler | |
| CN105157228B (en) | Waterpipe type central flame flame condenses all-in-one oven | |
| CN107559810B (en) | Vertical full-premix gas steam or hot water boiler | |
| CN205807457U (en) | A kind of strengthening disturbance full water cooling formula commercial gas cooking stove flue gas waste heat recovery apparatus | |
| CN205279448U (en) | Full premix condensation boiler | |
| CN204880066U (en) | Large -scale module high -efficient condensing gas steam boiler that gets ready | |
| CN202791953U (en) | Water pipe type condensation superheating steam generator | |
| CN103363663B (en) | Heavy die block assembling high-efficiency condensing type gas-fired water heating boiler | |
| CN106288371A (en) | Forced circulation fuel-firing gas-firing pipe hot water boiler | |
| CN207196469U (en) | A kind of vertical fully pre-mixing gas combustion steam or hot-water boiler | |
| CN202452665U (en) | Gas heating wall-hanging furnace | |
| CN105180421A (en) | Central back combustion boiler with water pipes being transversely scoured | |
| CN202747316U (en) | Compact turbocharged burning fire-tube boiler | |
| CN205245268U (en) | Commercial gas cooking range smoke waste heat recovery unit | |
| CN205279449U (en) | High -efficient plant specimen | |
| CN105066437B (en) | The complete wet back of the body central flame flame boiler of integral type | |
| CN204880675U (en) | Transversely erode water pipe wherein heart boiler that strile -backs | |
| CN204630027U (en) | Vertical double back journey gas-fired water heating boiler | |
| CN210718054U (en) | Corner tube type gas boiler | |
| CN204806438U (en) | Multistage heat pipe air heater | |
| CN203963899U (en) | Carbonization gas boiler | |
| CN203595271U (en) | Vertical non-pressurized water-tube chamber combustion water boiler with high heat exchange performance | |
| CN207963144U (en) | The low nitrogen gas fired-boiler of built-in self-circulating pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |