CN112113239A - Low-nitrogen boiler for removing return air condensate water - Google Patents
Low-nitrogen boiler for removing return air condensate water Download PDFInfo
- Publication number
- CN112113239A CN112113239A CN202010954241.5A CN202010954241A CN112113239A CN 112113239 A CN112113239 A CN 112113239A CN 202010954241 A CN202010954241 A CN 202010954241A CN 112113239 A CN112113239 A CN 112113239A
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- Prior art keywords
- smoke
- pipe
- return
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
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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
Abstract
The invention relates to a low-nitrogen boiler for removing return gas condensate water, which comprises a steam boiler, a burner, a smoke outlet pipe, a smoke exhaust pipe, an economizer, a first smoke return pipe and a second smoke return pipe, wherein the steam boiler is provided with a steam boiler and a combustion furnace, the burner and the smoke outlet pipe are respectively arranged at two ends of the combustion furnace, two ends of the combustion furnace are communicated, the smoke outlet pipe is connected to the economizer, the other end of the economizer is provided with the smoke exhaust pipe, one end of the first smoke return pipe is communicated with the smoke outlet pipe, one end of the second smoke return pipe is communicated with the smoke exhaust pipe, and the other ends of the first smoke return pipe and the second smoke return pipe are communicated with each other and connected to the. According to the invention, the smoke taking pipes are respectively added on the front and rear pipelines of the boiler economizer, two sections of smoke are mixed and then are re-conveyed to the combustor through the mixing smoke returning pipe, the mixed smoke and air have higher mixing temperature, the temperature of mixed air is balanced by adjusting the smoke taking temperature when the air temperature changes, and the generation of condensed water can be avoided when the air temperature is lower.
Description
Technical Field
The invention relates to the technical field of production equipment for preparing maleic anhydride by oxidizing n-butane, in particular to a low-nitrogen boiler for removing return gas condensate water.
Background
The process for preparing maleic anhydride by oxidizing n-butane is an advanced process for preparing maleic anhydride by adopting an n-butane oxidation method to generate maleic anhydride. The traditional benzene production process is expensive in price, high in toxicity, uneconomical and not in line with increasingly harsh environmental protection requirements. The n-butane oxidation process has the advantages of low raw material cost, relatively light pollution, high carbon atom utilization rate, low maleic anhydride production cost and the like, gradually becomes a main route of maleic anhydride production, and has a tendency of gradually replacing a benzene oxidation method.
A large amount of steam is needed in the process for preparing maleic anhydride by n-butane oxidation and auxiliary equipment thereof, steam boilers are mostly used for providing hot steam in the existing factories, the exhaust gas of the steam boilers contains a large amount of heat and pollutants, the state obviously limits the exhaust gas temperature of the steam boilers, and the exhaust gas temperature is required to be not higher than 250 ℃. At present, most steam boilers improve the smoke exhaust mode of the boiler, and the common mode is that heat in the smoke exhaust temperature is utilized, a smoke collection box is arranged, and hot water in the boiler is heated.
Still others mix the boiler flue gas with air and re-feed it to the burner, which improves the efficiency of the burner. However, under the condition of lower temperature in winter, a large amount of condensed water can be generated after the boiler flue gas is mixed with cooler air, and partial sulfur dioxide, carbon dioxide and nitrogen dioxide are dissolved in the condensed water, so that the condensed water is corrosive, and the service life of the combustor is influenced.
Disclosure of Invention
In view of the above, the present invention provides a low-nitrogen boiler for removing condensed water from returned gas, wherein flue gas taking pipes are respectively added to pipelines in front of and behind an energy saver of the boiler, two sections of flue gas are mixed and then re-delivered to a burner through a mixed smoke returning pipe, the mixed flue gas and air have higher mixing temperature, the temperature of mixed air is balanced by adjusting the flue gas taking temperature when the air temperature changes, and the generation of condensed water can be avoided when the air temperature is lower.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides a low-nitrogen boiler for removing return gas condensate water, which comprises a steam boiler, a burner, a smoke outlet pipe, a smoke exhaust pipe, an economizer, a first smoke return pipe and a second smoke return pipe, wherein the steam boiler is provided with a steam boiler and a combustion furnace, the burner and the smoke outlet pipe are respectively arranged at two ends of the combustion furnace, two ends of the combustion furnace are communicated, the smoke outlet pipe is connected to the economizer, the smoke exhaust pipe is arranged at the other end of the economizer, one end of the first smoke return pipe is communicated with the smoke outlet pipe, one end of the second smoke return pipe is communicated with the smoke exhaust pipe, and the other ends of the first smoke return pipe and the second smoke return pipe are communicated with each other and connected to the burner.
In the above-described low-nitrogen boiler with return-gas condensate removal, preferably, the first return-gas pipe passes through the steam boiler and the combustion furnace of the steam boiler.
In the above-mentioned low-nitrogen boiler for removing return-air condensate, as a preferred scheme, a wire mesh mixer is disposed at a position where the first return-air pipe and the second return-air pipe are communicated with each other.
In the above-mentioned low-nitrogen boiler for removing return-air condensate, as a preferred scheme, the output end of the wire mesh mixer is communicated to the air inlet end of the burner through a mixing smoke-returning pipe.
In the above-mentioned low-nitrogen boiler for removing return-air condensate, as a preferable scheme, a thermometer is arranged on the mixing smoke-returning pipe.
In the above-mentioned low-nitrogen boiler for removing condensed water from returned gas, as a preferred scheme, the economizer is provided with a water inlet pipe and a water return pipe, wherein cold water is input into the water inlet pipe, and the cold water is output into the steam boiler from the water return pipe after exchanging heat with flue gas discharged from the combustion furnace in the economizer.
In the above-mentioned low-nitrogen boiler for removing return-air condensed water, as a preferred scheme, a return valve is arranged on the return pipe.
In the above-mentioned low-nitrogen boiler for removing return-air condensate, as a preferred scheme, the first smoke-returning pipe is provided with a first smoke-returning valve, the second smoke-returning pipe is provided with a second smoke-returning valve, and the upper end of the steam boiler is provided with a steam outlet.
In the above-mentioned low-nitrogen boiler for removing return-air condensate, as a preferred scheme, the side walls of the end portions of the combustion furnace are respectively provided with a circular hole, the outlet end of the burner is connected with the circular hole on the side wall of one side of the combustion furnace in a matching manner through a sleeve assembly, and the smoke outlet pipe is mounted at the circular hole on the side wall of one side of the combustion furnace.
In the above-mentioned low-nitrogen boiler for removing return air condensate, as a preferred scheme, the sleeve pipe assembly includes a first sleeve pipe and a second sleeve pipe, a baffle is arranged at an end of one end of the first sleeve pipe, the baffle is detachably connected to the outer side wall of the combustion furnace, the outlet end of the burner is detachably connected to the baffle, the other end of the first sleeve pipe is in a circular pipe shape, the second sleeve pipe is in a circular pipe shape, the inner circle of the second sleeve pipe is in interference fit connection with the outer circle of the second sleeve pipe, and the outer circle of the second sleeve pipe is in interference fit connection with the circular hole.
The invention provides a low-nitrogen boiler for removing return air condensate water, which has the following beneficial effects:
the invention provides a low-nitrogen boiler except return gas condensate water, wherein flue gas smoke-taking pipes are respectively added on pipelines in front of and behind a boiler energy saver, two sections of flue gas are mixed and then are re-conveyed to a burner through a mixed smoke-taking pipe, the temperature of the mixed flue gas is higher after being mixed with air, a thermometer is arranged on the smoke-taking pipe, an optimal mixed air temperature is found out through field measurement, the flue gas smoke-taking temperature is adjusted to balance the combustion mixed air temperature when the air temperature changes, and the condensate water can be avoided when the outside air temperature is lower.
Drawings
FIG. 1 is a schematic structural diagram of a low-nitrogen boiler with return-gas condensate removal according to an embodiment of the present invention;
fig. 2 is a schematic view of a part a of fig. 1.
Description of reference numerals:
1-steam boiler, 2-steam boiler, 3-combustion furnace, 4-burner, 5-steam outlet, 6-water return pipe, 7-energy saver, 8-smoke outlet pipe, 9-first smoke return pipe, 10-second smoke return pipe, 11-water inlet pipe, 12-smoke exhaust pipe, 13-wire mesh mixer, 14-mixing smoke return pipe, 15-first smoke return valve, 16-second smoke return valve, 17-water return valve, 18-first sleeve, 19-second sleeve and 20-thermometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Exemplary embodiments of the present invention are described below in conjunction with specific cases:
referring to fig. 1, fig. 1 is a schematic structural diagram of a water washing apparatus for reaction generated gas in a process of preparing maleic anhydride by oxidizing n-butane according to an embodiment of the present invention; according to an embodiment of the present invention, the present invention provides a low-nitrogen boiler for removing return-gas condensate, including a steam boiler 1, a burner 4, a smoke outlet pipe 8, a smoke outlet pipe 12, an economizer 7, a first smoke return pipe 9 and a second smoke return pipe 10, wherein the steam boiler 1 is provided with a steam boiler 2 and a combustion furnace 3, the burner 4 and the smoke outlet pipe 8 are respectively disposed at two ends of the combustion furnace 3, two ends of the combustion furnace 3 are communicated, the smoke outlet pipe 8 is connected to the economizer 7, the other end of the economizer 7 is provided with the smoke outlet pipe 12, one end of the first smoke return pipe 9 is communicated with the smoke outlet pipe 8, one end of the second smoke return pipe 10 is communicated with the smoke outlet pipe 12, and the other ends of the first smoke return pipe 9 and the second smoke return pipe 10 are communicated with each other and connected to the.
In the above-described low-nitrogen boiler with return-gas condensate removal, the first return-gas pipe 9 preferably passes through the steam boiler 2 and the combustion furnace 3 of the steam boiler 1. The first smoke returning pipe 9 is hermetically connected with the steam boiler 2 and the combustion furnace 3 of the steam boiler 1 respectively, and the temperature of the steam boiler 1 is fully utilized to heat the smoke in the first smoke returning pipe 9 so as to increase the overall temperature of the mixed two sections of smoke.
In the low-nitrogen boiler for removing the return-air condensate, preferably, a wire mesh mixer 13 is disposed at a position where the first return-air pipe 9 and the second return-air pipe 10 are communicated with each other.
In the low-nitrogen boiler for removing the return air condensate, preferably, the output end of the wire mesh mixer 13 is communicated to the air inlet end of the burner 4 through a mixing smoke return pipe 14.
In the low-nitrogen boiler for removing the return air condensate, the mixing smoke returning pipe 14 is preferably provided with a thermometer 20.
In the above-mentioned low-nitrogen boiler for removing the return air condensate, as a preferred scheme, the economizer 7 is provided with a water inlet pipe 11 and a water return pipe 6, cold water is input into the water inlet pipe 11, and the cold water is output into the steam boiler 2 from the water return pipe 6 after exchanging heat with the flue gas discharged from the combustion furnace 3 in the economizer 7.
In the low-nitrogen boiler for removing the return air condensate, preferably, the return pipe 6 is provided with a return valve 17.
In the above-mentioned low-nitrogen boiler for removing return-air condensate, preferably, the first smoke-returning pipe 9 is provided with a first smoke-returning valve 15, the second smoke-returning pipe 10 is provided with a second smoke-returning valve 16, and the upper end of the steam boiler 2 is provided with the steam outlet 5. The opening size of the first smoke return valve 15 and the second smoke return valve 16 is adjusted, so that the mixing ratio of the two sections of smoke return is adjusted, and the temperature of the two sections of smoke after mixing is easier to adjust. The first smoke return valve 15 and the second smoke return valve 16 are butterfly valves.
In the above-mentioned low-nitrogen boiler that removes return air comdenstion water, as preferred scheme, have seted up the round hole on firing burning furnace 3 tip lateral wall respectively, and the exit end of combustor 4 is connected with the round hole cooperation on firing burning furnace 3 one side lateral wall through the thimble assembly, fires burning furnace 3 and installs out tobacco pipe 8 in the round hole department on leading one side lateral wall.
As shown in fig. 2, in the above-mentioned low-nitrogen boiler for removing return air condensate, as a preferred scheme, the sleeve assembly includes a first sleeve 18 and a second sleeve 19, a baffle is disposed at an end of the first sleeve 18, the baffle is detachably connected to an outer side wall of the combustion furnace 3, an outlet end of the combustor 4 is detachably connected to the baffle, the other end of the first sleeve 18 is in a circular tube shape, the second sleeve 19 is in a circular tube shape, an inner circle of the second sleeve 19 is in interference fit with an outer circle of the second sleeve 19, and an outer circle of the second sleeve 19 is in interference fit with the circular hole. When the combustor 4 is installed, the baffle plate of the first sleeve 18 is fixed on the outer wall of the steam boiler 1 through bolts, a plurality of threaded holes are reserved in the baffle plate, the end flange of the combustor 4 is fixed on the baffle plate through bolts, and the second sleeve 19 is connected with the first sleeve 18 through matching, so that the disassembly and the assembly are convenient.
The invention provides a low-nitrogen boiler except return gas condensate water, wherein a smoke taking pipe, namely a first smoke returning pipe 9 and a second smoke returning pipe 10, is respectively added on a smoke outlet pipe 8 in front of an economizer 7 of the boiler and a smoke discharging pipe 12 behind the economizer 7, two sections of smoke with different temperatures are mixed and then are re-conveyed to a burner 4 through a mixed smoke returning pipe 14, the mixed smoke is mixed with air and then has higher temperature, a thermometer 20 is arranged on the smoke returning pipe, an optimal mixed air temperature is found out through field measurement, the smoke taking temperature of the smoke is adjusted to balance the mixed air temperature when the air temperature changes, and the condensate water can be avoided when the outside air temperature is lower.
The wire mesh mixer 13 is of a box-shaped structure, metal meshes which are transversely and longitudinally staggered with each other are arranged inside the wire mesh mixer, and heat exchange is conveniently carried out on two sections of different flue gases so as to achieve sufficient mixing.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing detailed description of the embodiments of the present invention has been presented for purposes of illustration and description, and is intended to be exemplary only and is not intended to be exhaustive or to limit the invention to the precise forms disclosed; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The low-nitrogen boiler for removing the return-gas condensate water is characterized by comprising a steam boiler, a burner, a smoke outlet pipe, a smoke exhaust pipe, an economizer, a first smoke return pipe and a second smoke return pipe, wherein the steam boiler is provided with a steam boiler and a combustion furnace, the burner and the smoke outlet pipe are respectively arranged at two ends of the combustion furnace, two ends of the combustion furnace are communicated, the smoke outlet pipe is connected to the economizer, the smoke exhaust pipe is arranged at the other end of the economizer, one end of the first smoke return pipe is communicated with the smoke outlet pipe, one end of the second smoke return pipe is communicated with the smoke exhaust pipe, and the other ends of the first smoke return pipe and the second smoke return pipe are communicated with each other and connected to the burner.
2. The low-nitrogen boiler with return-air condensate removal according to claim 1, wherein the first return-air pipe passes through the steam boiler and the combustion furnace of the steam boiler.
3. The low-nitrogen boiler for removing return-air condensate of claim 2, wherein a wire mesh mixer is disposed at a position where the first return-air pipe and the second return-air pipe are communicated with each other.
4. The low-nitrogen boiler with return air condensate removal function according to claim 3, wherein the output end of the wire mesh mixer is communicated to the burner air inlet end through a mixing return smoke pipe.
5. The low-nitrogen boiler for removing return-air condensate of claim 4, wherein a thermometer is disposed on the mixing smoke return pipe.
6. The low-nitrogen boiler for removing return air condensate as claimed in claim 2, wherein the economizer is provided with a water inlet pipe and a water return pipe, the water inlet pipe is used for inputting cold water, and the cold water is outputted from the water return pipe to the steam boiler after exchanging heat with the flue gas discharged from the combustion furnace in the economizer.
7. The low-nitrogen boiler for removing return air condensate of claim 6, wherein a return valve is arranged on the return pipe.
8. The low-nitrogen boiler for removing return-air condensate of claim 2, wherein the first smoke-returning pipe is provided with a first smoke-returning valve, the second smoke-returning pipe is provided with a second smoke-returning valve, and the upper end of the steam boiler is provided with a steam outlet.
9. The low-nitrogen boiler for removing return air condensate as claimed in claim 2, wherein the side walls of the end portions of the combustion furnace are respectively provided with a circular hole, the outlet end of the burner is connected with the circular hole on the side wall of the combustion furnace through a sleeve assembly, and the smoke outlet pipe is mounted on the circular hole on the side wall of the combustion furnace.
10. The low-nitrogen boiler for removing return air condensate water as claimed in claim 9, wherein the sleeve assembly comprises a first sleeve and a second sleeve, a baffle is disposed at one end of the first sleeve, the baffle is detachably connected to an outer side wall of the combustion furnace, an outlet end of the burner is detachably connected to the baffle, the other end of the first sleeve is in a shape of a circular tube, the second sleeve is in a shape of a circular tube, an inner circle of the second sleeve is in interference fit connection with an outer circle of the second sleeve, and an outer circle of the second sleeve is in interference fit connection with the circular hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010954241.5A CN112113239A (en) | 2020-09-11 | 2020-09-11 | Low-nitrogen boiler for removing return air condensate water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010954241.5A CN112113239A (en) | 2020-09-11 | 2020-09-11 | Low-nitrogen boiler for removing return air condensate water |
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| CN112113239A true CN112113239A (en) | 2020-12-22 |
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| CN202010954241.5A Pending CN112113239A (en) | 2020-09-11 | 2020-09-11 | Low-nitrogen boiler for removing return air condensate water |
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| CN106524135A (en) * | 2016-11-29 | 2017-03-22 | 冯伟忠 | Flue gas recycling system and method for achieving boiler full-load low-oxygen low-nitrogen combustion |
| CN206398703U (en) * | 2017-01-11 | 2017-08-11 | 北京科诺锅炉有限公司 | A kind of flue gas recirculation device |
| CN206929755U (en) * | 2017-07-04 | 2018-01-26 | 武汉市新荣锅炉制造有限公司 | A kind of horizontal three return stroke wet back types fuel-firing gas-firing steam boiler |
| JP2018165610A (en) * | 2017-03-28 | 2018-10-25 | 多 神田 | Highly functional small combustion furnace with improved combustion efficiency and flue gas purification performance |
| CN208587896U (en) * | 2018-07-02 | 2019-03-08 | 重庆东洋锅炉有限公司 | A kind of ultralow nitrogen vapor boiler |
| CN109681860A (en) * | 2019-02-18 | 2019-04-26 | 新疆维吾尔自治区特种设备检验研究院 | A kind of system and method reducing the coking of high basic metal coal combustion |
| CN210373522U (en) * | 2019-06-26 | 2020-04-21 | 重庆太湖锅炉股份有限公司 | Vacuum boiler with flue gas recirculation |
| CN111237740A (en) * | 2020-03-16 | 2020-06-05 | 中国华能集团清洁能源技术研究院有限公司 | Anti-corrosion flue gas recirculation system and method |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101021316A (en) * | 2007-03-14 | 2007-08-22 | 哈尔滨工业大学 | Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology |
| CN102635852A (en) * | 2012-05-02 | 2012-08-15 | 中国科学院工程热物理研究所 | Fuel oil/gas boiler for reducing emission of nitric oxides and method |
| CN106524135A (en) * | 2016-11-29 | 2017-03-22 | 冯伟忠 | Flue gas recycling system and method for achieving boiler full-load low-oxygen low-nitrogen combustion |
| CN206398703U (en) * | 2017-01-11 | 2017-08-11 | 北京科诺锅炉有限公司 | A kind of flue gas recirculation device |
| JP2018165610A (en) * | 2017-03-28 | 2018-10-25 | 多 神田 | Highly functional small combustion furnace with improved combustion efficiency and flue gas purification performance |
| CN206929755U (en) * | 2017-07-04 | 2018-01-26 | 武汉市新荣锅炉制造有限公司 | A kind of horizontal three return stroke wet back types fuel-firing gas-firing steam boiler |
| CN208587896U (en) * | 2018-07-02 | 2019-03-08 | 重庆东洋锅炉有限公司 | A kind of ultralow nitrogen vapor boiler |
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Application publication date: 20201222 |