CN102537961A - Multi-nozzle semi-premixed gas burner - Google Patents

Multi-nozzle semi-premixed gas burner Download PDF

Info

Publication number
CN102537961A
CN102537961A CN2010105969687A CN201010596968A CN102537961A CN 102537961 A CN102537961 A CN 102537961A CN 2010105969687 A CN2010105969687 A CN 2010105969687A CN 201010596968 A CN201010596968 A CN 201010596968A CN 102537961 A CN102537961 A CN 102537961A
Authority
CN
China
Prior art keywords
gas
flame
branch
pipe
pipes
Prior art date
Application number
CN2010105969687A
Other languages
Chinese (zh)
Inventor
于晓亮
武红京
陈杰
Original Assignee
西安航天远征流体控制股份有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 西安航天远征流体控制股份有限公司 filed Critical 西安航天远征流体控制股份有限公司
Priority to CN2010105969687A priority Critical patent/CN102537961A/en
Publication of CN102537961A publication Critical patent/CN102537961A/en

Links

Abstract

The invention relates to a multi-nozzle semi-premixed gas burner, which comprises a main gas pipe 1, at least three branch gas pipes 2, injection pipes 3, nozzles 5 and flame stabilizing covers 4. The main gas pipe 1 is communicated with a gas pipeline, the branch gas pipes 2 are communicated with the main gas pipe, the injection pipes 3 are communicated with an air pipeline, the number of the injection pipes 3 is consistent with that of the branch gas pipes, the nozzles 5 are arranged at the heads of the branch gas pipes 2, the flame stabilizing covers 4 are arranged on the peripheries of the nozzles 5 respectively, the branch gas pipes 2 are evenly distributed on the periphery of the main gas pipe, openings of the injection pipes 3 are arranged on side walls of the corresponding branch gas pipes 2, and a plurality of air holes 6 are arranged on each flame stabilizing cover 4. The multi-nozzle semi-premixed gas burner is mounted at the center of the bottom of a heating furnace, the temperature of a hearth in a radiation section of the bottom of the heating furnace can be increased, the temperature and the exhaust temperature of the hearth in an upper convection section are reduced, the heat efficiency of the heating furnace is improved, waste gas is used, energy is saved, emission is reduced, reasonable length of flame jetted by the burner is ensured, and burning effect is enhanced so that the flame is rigid and powerful.

Description

一种多喷嘴半预混式燃气燃烧器技术领域[0001] 本发明涉及一种燃气(废气)燃烧器,尤其涉及一种在石化行业的加热炉炉底中心使用的燃气燃烧器。 Semi-premixed gas burner nozzle a multi BACKGROUND [0001] The present invention relates to a gas (exhaust gas) combustor, and more particularly relates to a heating furnace for use in the petrochemical industry bottom center of the gas burner. 背景技术[0002] 化工行业的加热炉通常采用在炉底圆周均布使用三台(多台)燃烧器喷出与炉管成平行方向的火焰加热方式,经常出现底部辐射段温度偏低,上部对流段温度偏高,同时排烟温度超出设计值等加热炉热效率偏等现象,其中一个主要原因就是辐射段温度场分布不合理,大部分热量没有集中在底部辐射换热,而跑到上部对流换热区换热了,造成加热炉热效率低下。 [0002] Furnace chemical industry usually used in the bottom three circumferentially uniformly distributed (multiple) burner tube furnace parallel to the discharge direction flame heating mode, often a bottom low temperature radiant section, the upper portion high temperature convection section, while the exhaust gas temperature exceeds the design values, etc. partial thermal efficiency of furnace and so on, wherein the temperature field of the radiant section is a major cause unreasonable distribution, most of the heat radiating heat exchanger is not concentrated at the bottom, while the upper convection went District heat exchanger, resulting in poor thermal efficiency of the furnace. [0003] 通常化工企业想通过加大炉底燃烧器燃气量增加底部对辐射换热,提高加热炉热效率,但是由于底部原有的燃烧器均采用与炉管成平行的火焰加热形式,在燃烧器结构一定的情况下,燃气量增加,烧嘴喷出的火焰长度变长,造成对流段温度偏高,甚至烧坏换热管挂钩等不利于安全生产现象。 [0003] Generally chemical companies want to increase the amount of gas to the bottom floor burner radiative heat transfer increases, improving furnace thermal efficiency, but since the bottom of the original and the burner tubes are used in parallel to form a heating flame in the combustion structure in certain circumstances, increase the amount of gas, the burner discharge flame length becomes long, resulting in the convection section of the high temperature, heat transfer tubes even burn linking phenomenon which is detrimental to production safety. [0004] 原加热炉正常使用中出现底部辐射段炉膛温度不够,上部对流段炉膛温度和排烟温度偏高,增加原有三台炉底圆周均布的燃烧器热负荷,不能提高对流段炉膛温度,反而对流段炉膛温度和排烟温度继续增加。 [0004] in normal use the original bottom of the furnace radiant section of the furnace temperature is not enough, the upper convection section of the furnace temperature and exhaust gas temperature is high, increasing the burner heat load original three circumferentially equispaced bottom, the furnace temperature can not be increased convection section instead convection section of the furnace temperature and exhaust gas temperature continues to increase. [0005] 另一方面,化工企业本身又自产很多工艺废气,废气中含有很多可燃成分(如: H2、CO、CH4等)都进行简单地放空处理,造成资源的浪费和环境的污染。 [0005] On the other hand, a lot of chemical industry production process exhaust itself, contains a lot of combustible components in the exhaust gas (eg: H2, CO, CH4, etc.) will be simply venting process, environmental pollution and waste of resources. 发明内容[0006] 本发明的目的是提供一种多喷嘴半预混式燃气燃烧器,其既可以把原有自产放空的废气作为有效燃料,又可以解决现有加热炉辐射段温度场分布不合理,排烟温度偏高,加热炉热效率偏低等技术问题。 SUMMARY OF THE INVENTION [0006] The object of the present invention is to provide a multi-nozzle premix type gas burner half, which may be vented to the original production of the exhaust gas as a fuel efficient, but also can solve the conventional temperature field distribution of the furnace radiant section unreasonable, exhaust gas temperature is high, the low thermal efficiency of furnaces and other technical issues. [0007] 本发明的技术解决方案是:[0008] 一种多喷嘴半预混式燃气燃烧器,其特殊之处在于:包括与燃气管道相通的主燃气管1、与主燃气管相通的至少三个支燃气管2、与空气管道相通且数量与支燃气管一致的引射管3、设置在支燃气管2头部的喷嘴5、设置在喷嘴5周边的稳焰罩4 ;所述支燃气管2 均勻分布在主燃气管周围;所述引射管3开口于相应的支燃气管2的侧壁上;所述稳焰罩4 上设置有多个气孔6。 [0007] The technical solution of the invention is: [0008] A semi-multi-nozzle premix type gas burner, which is special in that: a gas pipeline communicating with the main gas pipe 1, a main gas pipe in communication with at least three branch gas pipe 2, and communicates with the air duct with the same number of branch gas pipe ejector pipe 3, the nozzle 52 is provided at the head of the branch gas pipe, the flame cover is provided around the nozzle 4, 5; said support 2 gas uniformly distributed around the main gas pipe; the ejector pipe 3 opening on the side wall of the respective branch gas pipe 2; a plurality of pores 6 are provided on the cover 4 of the steady flame. [0009] 上述支燃气管2的轴线与主燃气管1轴线夹角a为10〜30°。 [0009] 1 axis angle above the axis of the main gas pipe is a branch gas pipe 2 is 10~30 °. [0010] 上述稳焰罩4的气孔6为椭圆形气孔,其数量为12个。 [0010] The flame-hole 4 of the cover 6 is oval hole in an amount of 12. [0011] 本发明的优点:[0012] 1、安装在加热炉炉底中心位置,可以达到提高底部辐射段炉膛温度,降低上部对流段炉膛温度和排烟温度,提高加热炉热效率,同时达到废气利用节能减排的目的。 [0011] The advantages of the invention: [0012] 1, mounted on the furnace bottom central location in the bottom of the radiant section of the furnace to improve the temperature, decreasing the upper convection section of the furnace temperature and exhaust gas temperature, improved furnace thermal efficiency, the exhaust gas while achieving using the energy saving purpose. [0013] 2、如图3所示,本新型燃烧器安装在加热炉炉底中心上,并且支燃气管的喷嘴方3向要在原加热炉燃烧器喷出的火焰两者之间,保证本新型燃烧器喷出的三股火焰均布在原燃烧器火焰间,这样可以避免两股火焰叠加造成火焰长度和方向变化舔舐加热炉炉管给安全生产带来隐患,同时可以改善辐射段温度场分布。 [0013] 2, 3, the new burner installed on the bottom center of the furnace, and the nozzle side branch gas pipe 3 to be between the two primary furnace burner flame ejected, to ensure that this novel triple flame burner is ejected uniformly distributed between the primary burner flame, the flame to avoid superposition of two strands cause a change in flame length and direction of the heating furnace tube licking hidden dangers to the safety of production, and can improve the temperature distribution of the radiant section field . [0014] 3、支燃气管轴线与主燃气管轴线的夹角大小直接关系到本燃烧器喷出的火焰是否能够舔舐到加热炉壁面从而造成安全生产隐患,所以本发明经过精心的计算、模拟、试验确定多个支燃气管轴线与主燃气管轴线方向成10〜30°夹角。 [0014] 3, the angle between the axis of the branch gas pipe size of the main gas pipe axis is directly related to the present burner flame is ejected into the furnace wall surface can be licking causing safety hazards, the present invention is carefully calculated, simulation, testing to determine a plurality of branch gas pipe axis of the main gas pipe axis direction of 10~30 ° angle. [0015] 4、本发明设置了引射管,将一部分空气作为一次风与燃气(废气)预混,达到减少火焰长度目的,保证本新型燃烧器喷出的火焰长度合理。 [0015] 4, the present invention is provided with ejector pipe, a part of the air as primary air and fuel gas (exhaust gas) premix, to reduce flame length object, the present novel ensure proper discharge of the burner flame length. [0016] 5、本发明每个支燃气管都装有引射管,在支燃气管端部连接喷嘴,喷嘴与引射管之间设置稳焰罩,稳焰罩上开了12个椭圆形气孔,起到二次风作用,强化空气与燃料混合, 强化燃烧效果,使火焰刚性有力。 [0016] 5, the present invention each branch gas pipes are equipped with ejector pipe connected to the flame shroud is provided between a nozzle in the ejector pipe branch gas pipe end, the flame cover 12 opened oval hole, play the role of secondary air, to strengthen the air is mixed with fuel, enhanced combustion effect, strong rigidity of flame. 附图说明[0017] 图1为本发明的主视图;[0018] 图2是图1的俯视图;[0019] 图3是本发明在加热炉中的火焰示意图;[0020] 图4是本发明在加热炉中的位置示意图;[0021] 其中:1-主燃气管,2-支燃气管,3-引射管,4-稳焰罩,5-喷嘴,6_气孔,7_加热炉辐射段耐火层,8-天然气燃烧器火焰,9-多喷嘴半预混式燃烧器火焰,10-加热炉炉底, 11-多喷嘴半预混式燃烧器,12-天然气燃烧器。 BRIEF DESCRIPTION front view [0017] of the present invention, FIG. 1; [0018] FIG. 2 is a plan view of FIG. 1; [0019] FIG. 3 is a schematic view of the flame in the furnace of the present invention; [0020] FIG. 4 of the present invention is a schematic view of a position in the heating furnace; [0021] wherein: l- main gas pipe, gas pipe branch 2-, 3- ejector pipe, the flame cover 4-, 5- nozzle, 6_ porosity, radiation heating furnace 7_ segment refractory layer, gas burner flame 8-, 9- semi premixed multi-nozzle burner flame, the furnace bottom 10-, 11- half multi-nozzle premix burner, gas burner 12-. 具体实施方式[0022] 如图1、2中所示,本发明包括一个主燃气管1、三个支燃气管2、三个引射管3、三个稳焰罩4、三个喷嘴5。 DETAILED DESCRIPTION [0022] As shown, the present invention comprises a main gas pipe 1, three branch gas pipe 2, three ejector pipe 1, 2 3, three flame-cap 4, three nozzles 5. 支燃气管2成120°圆周均布在主燃气管1上,其轴线与主燃气管1轴线方向成10-30°夹角。 2 into the gas branch pipes 120 ° circumferentially uniformly distributed in the main gas pipe 1, which is an axis of the main gas pipe axis direction of an angle 10-30 °. 每个支燃气管2有装有引射管3,在支燃气管2端部连接喷嘴5,喷嘴5与引射管3之间设置稳焰罩4,稳焰罩4上开了12个椭圆形气孔6,起到二次风作用,强化燃料气体燃烧效果,使火焰刚性有力。 Each branch gas pipe 2 is equipped with a 3 ejector pipe connected to the nozzle 5 at the second end portion of the gas branch pipe 5 and the nozzle 3 is provided between the ejector pipe flame-cap 4, the flame cover 12 opened ellipse 4 shaped pores 6, play a role in secondary air, to strengthen the fuel gas combustion efficiency, strong rigidity of flame. [0023] 本发明在某化工企业合成氨造气车间两台天然气加热炉上试验的效果如下:[0024] 该加热炉为管式加热的常压炉,总炉高22. 27m,下部辐射段高7. 73m,内径2. 66m, 中部对流段高4. 03m,内径1. 9m,顶部排烟筒高10. 51m,内径1. 0m。 [0023] The present invention tested in the workshop two ammonia syngas gas heater in a Chemical results are as follows: [0024] The heating furnace is a tubular atmospheric furnace, a high total furnace 22. 27m, the lower portion of the radiant section high 7. 73m, inner diameter 2. 66m, the middle high convection section 4. 03m, inner diameter of 1. 9m, high exhaust chimney top 10. 51m, inner diameter of 1. 0m. 加热炉炉底圆周均布三个燃料天然气的燃烧器,均为自然引风式扩散燃烧方式。 Three circumferentially equispaced hearth furnace fuel gas burners, induced draft are natural diffusion combustion mode. 来自压缩机的天然气先进入天然气加热炉辐射段预热,然后进氧化锰脱硫槽脱硫,再送入对流段继续升温到480 士5°C,满足天然气蒸气转化法温度工艺要求后送入一段炉。 Natural gas from the compressor into the furnace radiant section to preheat, and then into the manganese oxide desulfurization desulfurization tank, and then into the convection section continue to heat up to 480 persons 5 ° C, the steam reforming process of natural gas to meet the process requirements into the reformer temperature. 在正常生产时加热炉出现排烟温度偏高, 被加热的天然气介质进一段炉温度偏低不符合工艺技术要求,加热炉热效率低下。 Appears normal production furnace exhaust gas temperature is high, the heating medium gas into the furnace section of low temperature technology does not meet the requirements, the thermal efficiency of the furnace is low. [0025] 该企业合成氨工艺产生的废气主要参数为:总流量2000-3000Nm3/h,到新型燃烧器喷嘴前管道为压力O.SMPa,温度低于35°C,废气主要成分(均值)见表1。 [0025] The main parameters of the exhaust gas produced by the process of enterprise ammonia: total flow 2000-3000Nm3 / h, before new burner nozzle pipe pressure O.SMPa, a temperature below 35 ° C, the main component of the exhaust gas (mean) Table 1. [0026] 表1废气成分[0027] [0026] The exhaust gas composition in Table 1 [0027]

Figure CN102537961AD00051

[0028] 使用本发明时,本新型燃烧器安装在加热炉炉底中心上,并且支燃气管的喷头方向要在原加热炉燃烧器喷出的火焰两者之间,保证本新型燃烧器喷出的三股火焰均布在原燃烧器火焰间,附图3中的夹角B为支燃气管轴线与主燃气管轴线方向夹角a。 [0028] When using the present invention, the present new burner mounted on a bottom center of the furnace, and the direction of the nozzle to branch gas pipe between the two primary furnace burner flame sprayed, to ensure discharge of this new burner the three strands uniformly distributed between the original flame burner flame, the angle B in the figures 3 and the main gas pipe axis direction of the pipe axis an angle a branched gas. 这样可以避免两股火焰叠加造成火焰长度和方向变化舔舐加热炉炉管给安全生产带来隐患,同时可以改善辐射段温度场分布。 This avoids superposition of two shares of flame length and direction of the change caused by the flame licking the heating furnace tube production has brought to safety risks, while improving the radiant section temperature distribution. 从燃烧器喷嘴喷出的火焰短而刚进有力,燃料天然气使用量节约了^0Nm7h,排烟温度下降了60°C左右,同时满足了天然气介质进一段炉温度为480士5°C。 Ejected from the nozzle of the burner flame entered short and powerful, use of natural gas fuel savings ^ 0Nm7h, the exhaust gas temperature dropped by about 60 ° C, while meeting the reformer gas inlet medium temperature of 480 persons 5 ° C. [0029] 新型燃烧器使用前后天然气加热炉运行参数对比(6个月平均值)见表2。 [0029] The operating parameters of the gas heater before and after contrast new burner (6 months average) are shown in Table 2. [0030] 表2使用前后天然气加热炉运行参数对比[0031] [0030] Table 2 gas heater operational parameters before and after contrast [0031]

Figure CN102537961AD00052

[0032] 从表2中可以看出,使用本新型燃烧器后天然气加热炉运行工况得到改善:[0033] 1、节约了燃料天然气,经济效益显著,同时有利于环境保护[0034] 燃料天然气使用量平均节约了280Nm3/h,既节约了天然气又把原有白白放空的工艺废气有效地利用起来,经济效益、环境效益显著。 [0032] As can be seen from Table 2, the use of this new gas burner furnace operating conditions are improved: [0033] 1, natural gas fuel savings, significant economic benefits, while environmentally [0034] Fuel Gas the amount of saving an average of 280Nm3 / h, which saves the original process exhaust gas again freely vented effectively utilized, economic and environmental benefits significantly. [0035] 2、改善了温度流场分布,提高了天然气加热炉热效率[0036] 使用后,由于火焰分布的变化,改善了辐射段的温度场分布,强化了对流段的换热效果,提高了加热炉的热效率。 [0035] 2, to improve the flow field temperature, the thermal efficiency is improved gas heater [0036] After use, due to changes in the distribution of the flame, improving the temperature distribution in the radiant section, the reinforcing effect of the convection heat transfer section, to improve the the thermal efficiency of the furnace. 使用后天然气去脱硫槽温度平均降低20°C,而进一段炉温度却平均提高10°C,说明使用后加热炉温度流场更加合理,改善了辐射段温度分布。 Use of natural gas after desulfurization to reduce the average tank temperature of 20 ° C, and into the reformer temperature was an average of 10 ° C, using a heating furnace after the temperature described more reasonable flow field, improving the temperature distribution in the radiant section. 同时烟道排烟温度下降60°C,炉膛中心温度降低40°C,加热炉辐射段和对流段换热更加合理,加热炉热效率明显提高。 At the same time decrease the exhaust gas temperature of the flue 60 ° C, the furnace temperature was lowered center of 40 ° C, the furnace radiant section and a convective heat transfer section is more reasonable, furnace thermal efficiency is significantly improved.

Claims (3)

1. 一种多喷嘴半预混式燃气燃烧器,其特征在于:包括与燃气管道相通的主燃气管、 与主燃气管相通的至少三个支燃气管、与空气管道相通且数量与支燃气管一致的引射管、 设置在支燃气管头部的喷嘴、设置在喷嘴周边的稳焰罩;所述支燃气管均勻分布在主燃气管周围;所述引射管开口于相应的支燃气管的侧壁上;所述稳焰罩上设置有多个气孔。 A multi-nozzle premix type gas burner half, characterized by: a main gas pipe communicating with the gas pipeline, the main gas pipe communicating with at least three branch gas pipe, an air duct in communication with the number of branches and the gas consistent tube ejector pipe, a gas pipe disposed at the head of the branch nozzle, the nozzle disposed at the periphery of the flame cover; the branch gas pipe uniformly distributed around the main gas pipe; opening of the ejector pipe to the respective branch gas on the sidewalls of the tube; said cover is provided with a plurality of flame-pores.
2.根据权利要求1所述的多喷嘴半预混式燃气燃烧器,其特征在于:所述支燃气管的轴线与主燃气管轴线夹角a为10〜30°。 The semi-multi-nozzle premix type gas burner according to claim 1, wherein: the axis of the main gas pipe axis an angle of a branch gas pipe is 10~30 °.
3.根据权利要求1或2所述的多喷嘴半预混式燃气燃烧器,其特征在于:所述稳焰罩的气孔为椭圆形气孔,其数量为12个。 The semi-multi-nozzle premix type gas burner of claim 1 or claim 2, wherein: said cover pores flame-elliptical pores in an amount of 12.
CN2010105969687A 2010-12-20 2010-12-20 Multi-nozzle semi-premixed gas burner CN102537961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010105969687A CN102537961A (en) 2010-12-20 2010-12-20 Multi-nozzle semi-premixed gas burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010105969687A CN102537961A (en) 2010-12-20 2010-12-20 Multi-nozzle semi-premixed gas burner

Publications (1)

Publication Number Publication Date
CN102537961A true CN102537961A (en) 2012-07-04

Family

ID=46345528

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010105969687A CN102537961A (en) 2010-12-20 2010-12-20 Multi-nozzle semi-premixed gas burner

Country Status (1)

Country Link
CN (1) CN102537961A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275552A (en) * 1992-03-27 1994-01-04 John Zink Company, A Division Of Koch Engineering Co. Inc. Low NOx gas burner apparatus and methods
CN2482634Y (en) * 2001-08-15 2002-03-20 湖南吉祥燃烧器股份有限公司 Low No x double-side flat flame environment protection energy-saving efficient gas-firing burner
JP2006275334A (en) * 2005-03-28 2006-10-12 Osaka Gas Co Ltd Combustion device for heating furnace
CN101694297A (en) * 2009-10-23 2010-04-14 洛阳瑞昌石油化工设备有限公司; Forced-draft burner and method for regularizing side-combustion high-temperature preheated air of square-box furnace
CN201964415U (en) * 2010-12-20 2011-09-07 西安航天远征流体控制股份有限公司 Multinozzle semi-premixed gas burner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275552A (en) * 1992-03-27 1994-01-04 John Zink Company, A Division Of Koch Engineering Co. Inc. Low NOx gas burner apparatus and methods
CN2482634Y (en) * 2001-08-15 2002-03-20 湖南吉祥燃烧器股份有限公司 Low No x double-side flat flame environment protection energy-saving efficient gas-firing burner
JP2006275334A (en) * 2005-03-28 2006-10-12 Osaka Gas Co Ltd Combustion device for heating furnace
CN101694297A (en) * 2009-10-23 2010-04-14 洛阳瑞昌石油化工设备有限公司; Forced-draft burner and method for regularizing side-combustion high-temperature preheated air of square-box furnace
CN201964415U (en) * 2010-12-20 2011-09-07 西安航天远征流体控制股份有限公司 Multinozzle semi-premixed gas burner

Similar Documents

Publication Publication Date Title
CN102003710B (en) Low emission high-power staged-combustion gas burner and gas collocation method thereof
CN102287819B (en) Porous medium combustor for low-caloric-value gas fuel
CN101707893B (en) Air heater
CN202132947U (en) Porous medium burner for burning low heat value gas fuel
CN101476726B (en) High-temperature low-oxygen combustor
CN2632503Y (en) Low pressure premixed high performance energy saving and environment protecting gas burner with flat flame and less NOx exhaust
CN100464119C (en) Blowed premixed efficient gas burner
CN101922742B (en) Integrally closed energy-saving gas cooker
CN201137928Y (en) Single heat accumulating type combustion device
CN201706550U (en) Double-independent-oxygen-supply high-efficient energy-saving environment-friendly burner
CN203116014U (en) Multi-stage combustion flat flame type heat storage nozzle
CN202415585U (en) Hot-blast stove for spraying mixed coal gas and air in loop from uniformly-distributed spray nozzles to form reflow for combusting
CN2451907Y (en) Premixing low pressure gas combustor
CN101024859B (en) Ball-shape top-burning type hot-air furnace with annular-arranged vertical up-spray burner
CN201354356Y (en) Reacting furnace for producing soft carbon blacks
CN201852093U (en) Air single heat-storage fuel continuous feeding type burner nozzle
CN101696803B (en) T-shaped burning beam
CN201387007Y (en) Natural gas burner with water vapor ejecting device
CN202328252U (en) Low-NOx side wall gas combustor using preheating combustion-supporting air
CN102305415B (en) Plasma oil-free ignition system in oxygen-enriched environments
CN101619852A (en) Commercial high-efficiency energy-saving gas burner
CN102607026A (en) Tubular self-preheating gas burner
CN2753990Y (en) Efficient energy-saving environmental-protection gas stove-range device
CN2687573Y (en) Top-combustion burner hot-blast stove
CN102777934B (en) Standing-vortex soft combustion chamber

Legal Events

Date Code Title Description
C06 Publication
C10 Entry into substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)