WO2012097602A1 - 利用烟气余热产生低压蒸汽的系统 - Google Patents

利用烟气余热产生低压蒸汽的系统 Download PDF

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Publication number
WO2012097602A1
WO2012097602A1 PCT/CN2011/080005 CN2011080005W WO2012097602A1 WO 2012097602 A1 WO2012097602 A1 WO 2012097602A1 CN 2011080005 W CN2011080005 W CN 2011080005W WO 2012097602 A1 WO2012097602 A1 WO 2012097602A1
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flue gas
heat
flue
waste heat
boiler
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PCT/CN2011/080005
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English (en)
French (fr)
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蔡智斌
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上海伏波环保设备有限公司
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Publication of WO2012097602A1 publication Critical patent/WO2012097602A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • 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
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/36—Water and air preheating systems

Definitions

  • the invention relates to the waste heat recovery and utilization of boiler exhaust gas, in particular to a system for generating low pressure steam by utilizing residual heat of flue gas. Background technique
  • the flue gas emitted by the boiler contains acid gas.
  • the temperature of the smoke When the temperature of the smoke is high, they will flow through the heated surfaces of the boiler in a gaseous state until they are removed into the desulfurization tower.
  • the temperature of the smoke When the temperature of the smoke is lower than a certain temperature, they will form sulfuric acid with the water vapor in the flue gas to corrode the heat exchange equipment. Low temperature corrosion typically occurs in the cold end of the air preheater and in the economizer where the feed water temperature is low.
  • the temperature of the heated surface When the temperature of the heated surface is lower than the dew point of the flue gas, the water vapor in the flue gas and the sulfuric acid formed by the combustion of the sulfur trioxide (only a small part of the sulfur fuel product) will condense on the heating surface.
  • the boiler exhaust gas temperature is usually designed to be high.
  • the new boiler is about 140 °C. After running for a period of time, it tends to be as high as 160 °C.
  • the direct emission of this part of the flue gas causes a large Energy waste.
  • there are mainly mature technologies such as low-pressure economizer, heat pipe heat exchanger and composite phase heat exchanger.
  • the low-pressure economizer technology is mainly used to reduce the exhaust gas temperature in domestic large and medium-sized power plants. It is installed in the flue of the boiler tail and is cooled by the condensate on the water side of the low-pressure heater in the steam turbine regenerative system instead of the high-pressure feed water. Flue gas, its heat exchange conditions are similar to the economizer, but the pressure on the water side is much lower than the pressure of the economizer, so it is called the low pressure economizer.
  • the installation of the low-pressure economizer allows the steam turbine heat exchange system to obtain an external heat, saves a part of the pumping, and recovers the heat loss of the exhaust gas well, which improves the thermal efficiency of the whole plant.
  • the low-pressure economizer is slightly inferior in energy utilization level compared with the high-pressure economizer.
  • the temperature of the condensate rises, the amount of regenerative pumping is reduced, and the condensation component entering the condenser is increased, thereby increasing the heat loss of the exhaust steam and reducing the cycle efficiency.
  • the amount of pumping is reduced, the amount of steam work is increased. This part is the real benefit of using the low pressure economizer system.
  • a heat pipe is a component that relies on its internal working liquid phase change to achieve heat transfer.
  • the heat pipe can be divided into two parts: the evaporation section and the condensation section.
  • the working fluid is heated and vaporized by the heat source to become steam, and the steam flows to the other end along the intermediate channel under the pressure difference.
  • the steam condenses into a liquid after releasing the latent heat to the cold source in the condensation section; when the working medium evaporates in the evaporation section, the gas-liquid interface is concave, forming a plurality of meniscus liquid surfaces, generating capillary pressure, and the liquid working medium is in the capillary capillary pressure Returning to the evaporation section under the action of return flow such as gravity, Continued heat absorption and evaporation, so that the evaporation and condensation of the working fluid will continuously transfer heat from the hot end to the cold end. Since the heat pipe uses the phase change heat of the working fluid to transfer heat, the heat pipe has a large heat transfer capacity and heat transfer efficiency.
  • the composite phase change heat exchanger is further extended on the basis of the heat pipe, and the original heat pipe cluster is connected to make the internal medium flow freely, and the working pressure of the internal medium can be adjusted randomly with the load change. , the non-condensable gas in the heat pipe cluster can be discharged at any time.
  • the technical problem to be solved by the present invention is to provide a system for generating low-pressure steam using waste heat of flue gas, which overcomes the above problems in the prior art.
  • the invention discloses a system for generating low-pressure steam by using waste heat of flue gas, comprising a boiler flue provided with a multi-stage heating surface, wherein the last-stage heating surface is located at the tail of the boiler flue, and further comprises a flue gas waste heat evaporator and flue gas waste heat.
  • a recycling device before the flue gas waste heat evaporator is added to the final heating surface of the boiler flue, the flue gas waste heat recovery device comprises a connected heat absorption section and a heat release section, and the heat absorption section is added to the boiler flue. After the last stage heating surface.
  • a dust removal and desulfurization device is further disposed in the boiler flue after the final heating surface of the present invention, and the heat absorption section is disposed between the final heating surface and the dust removal and desulfurization device.
  • a temperature sensor is disposed on the heat absorption section of the present invention, and an electric control valve is disposed on the gas outlet pipe of the flue gas waste heat evaporator, and the temperature sensor and the electric control valve are respectively connected to a control system.
  • an economizer and an air preheater are sequentially arranged according to a direction of the flue gas flow, and the flue gas residual heat evaporator is disposed between the economizer and the air preheater, and the heat absorption section Placed behind the air preheater, and the heat release section is placed in the inlet duct of the air preheater.
  • an economizer and a two-stage air preheater are sequentially arranged according to the direction of the flue gas flow, and the flue gas residual heat evaporator is placed between the two-stage air preheater, the heat absorption section It is placed behind the second stage air preheater, and the heat release section is placed in the inlet duct of the first stage air preheater.
  • FIG. 1 is a schematic view of a specific embodiment of a system for generating low pressure steam using waste heat of flue gas according to the present invention. detailed description
  • a system for generating low pressure steam using flue gas waste heat comprising a boiler flue 4 provided with a multi-stage heating surface, wherein the final heating surface is located at the tail of the boiler flue, in the last two embodiments below
  • the heating surface refers to the air preheater 3 and the second stage air preheater, respectively, and further includes a flue gas waste heat evaporator 2 and a flue gas waste heat recovery device, and the flue gas waste heat evaporator 2 is added to the last stage of the boiler flue 4
  • the flue gas waste heat recovery device comprises a connected heat absorption section 5 and a heat release section 7, and the heat absorption section 5 is added after the last stage heating surface in the boiler flue.
  • a dust removal and desulfurization device is also arranged in the boiler flue after the final heating surface, and the heat absorption section 5 is disposed between the final heating surface and the dust removal and desulfurization device.
  • the heat absorption section 5 is provided with a temperature sensor 6, and the flue gas waste heat evaporator outlet pipe is provided with an electric control valve 8, and the temperature sensor 6 and the electric control valve 8 are respectively connected to a control system 9.
  • a specific embodiment of a system for generating low-pressure steam by utilizing flue gas waste heat is provided.
  • a flue gas flow direction of the boiler tail flue 4 is provided.
  • Economizer 1 and air preheater 3 the economizer outlet air preheater smoke temperature is generally around 30 CTC, at this time the air preheater is the last stage heating surface in the flue.
  • the present invention installs the flue gas waste heat evaporator 2 between the economizer 1 and the air preheater 3, and can easily generate saturated steam of about 0.5 Mpa.
  • the absorption of the air preheater 3 is reduced and the exhaust gas temperature is lowered.
  • a flue gas waste heat recovery device is added to absorb some low-grade waste heat of the flue gas. Returned to the air preheater 3.
  • the flue gas waste heat recovery device comprises an associated heat absorption section 5 and a heat release section 7, the heat absorption section 5 is placed in the rear flue of the air preheater 3, and the heat release section 7 is placed in the inlet duct of the air preheater. The heat absorbed by the flue gas waste heat recovery device is returned to the air preheater.
  • the temperature difference between the flue gas outside the air preheater and the internal air is reduced, and the heat exchange amount is reduced, and the air is reduced.
  • the temperature of the flue gas at the outlet of the heat exchanger is increased, and the air entering the air preheater is heated by the heat release section of the flue gas waste heat recovery device, thereby effectively avoiding the acid dew corrosion of the air preheater.
  • the heat absorption section 5 of the flue gas waste heat recovery device is placed in the flue to absorb heat and transferred to the working medium, and the working medium transfers heat to the cold air in the heat release section 7, and the working mechanism of the working medium is usually high temperature forced circulation water or Naturally circulating steam, so its heat transfer coefficient is much higher than the flue gas side, so that the wall temperature is determined by the working medium side temperature, and the flue gas waste heat recovery and utilization device is controlled to protect against acid dew corrosion by controlling the temperature of the working medium.
  • a temperature sensor 6 is added to the heat absorption section 5
  • an electric regulating valve 8 is added to the air outlet pipe of the flue gas residual heat evaporator, and the temperature sensor 6 and the electric regulating valve 8 are respectively connected to the control device 9, and the control device 9 can follow
  • the boiler load is arbitrarily adjusted to the wall temperature so that it is always higher than the flue gas dew point temperature to maximize the recovery of exhaust heat.
  • the working principle of the invention is as follows: the installation position of each device according to the flow direction of the flue gas is: economizer 1, flue gas residual heat evaporator 2, air preheater 3, flue gas waste heat recovery and utilization device heat absorption section 5 and installed in The flue gas waste heat recovery device in the inlet duct of the boiler air preheater is exothermic section 7, and then the dust desulfurization device is removed. The air flows through the exothermic section of the flue gas waste heat recovery and utilization device. 7. After the air preheater 3 enters the furnace.
  • the flue gas waste heat evaporator 2 absorbs part of the flue gas residual heat entering the air preheater 3 to generate low pressure saturated steam, and the specific heat absorption is determined according to the acid dew point temperature calculation of the flue gas; assuming the original boiler system air preheater 3
  • the outlet exhaust gas temperature is Ti
  • the acid dew point temperature is T 2 .
  • the wall temperature of the flue gas waste heat recovery and utilization device 5 in contact with the flue gas should be It is higher than ⁇ 2 , leaving a safety margin of 10 °C.
  • the temperature of the flue gas and the wall temperature of the flue gas waste heat recovery and utilization device 5 should have a certain heat transfer temperature difference to ensure the heating surface of the flue gas waste heat recovery and utilization device 5.
  • economical arrangement so in this case the flue gas heat recovery apparatus evaporating section 5 of the exhaust gas temperature T 2 plus a safety margin 10 ° C plus the heat transfer temperature difference of about 15 ° C, referred to as T 3, boiler system can calculate the temperature drop saving space T ⁇ 3, since the flue gas heat recovery means is used to compensate for the loss of the air preheater, and provides no external heat, the real energy recovery of flue gas waste heat evaporator section External heat 2, apparently flue gas heat evaporator temperature difference between import and export 2 can not be greater than T T3, so as to ensure the impact of waste heat boiler thermal evaporator system is not installed.
  • Another embodiment of the system for generating low-pressure steam by utilizing residual heat of flue gas is provided with an economizer and a two-stage air preheater in the direction of the flue gas flow in the boiler flue, and the flue gas residual heat evaporator is disposed. Between the two-stage air preheater, the heat absorption section is disposed behind the second stage air preheater, and the heat release section is disposed in the inlet duct of the first stage air preheater.
  • the other structure is the same as that of the above embodiment.
  • the flue gas waste heat recovery and utilization device of the invention absorbs and improves the structural forms of the low pressure economizer and the heat pipe heat exchanger to prevent low temperature corrosion, and at the same time controls the exothermic heat of the exothermic section of the flue gas waste heat recovery device to control the flue gas through the control device Temperature, the maximum use of flue gas waste heat, energy saving and emission reduction.

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  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Description

利用烟气余热产生低压蒸汽的系统 技术领域
本发明涉及锅炉排烟的余热回收利用，特别涉及一种利用烟气余热产生低压蒸 汽的系统。 背景技术
锅炉排放的烟气中含有酸性气体，烟温高时它们会以气态的形式流经锅炉各受 热面直至到脱硫塔里被除去。 当烟温低于某一温度时， 它们会与烟气中的水蒸汽结 合成硫酸而腐蚀换热设备。低温腐蚀通常出现在空气预热器的冷端以及给水温度低 的省煤器中。 当受热面的温度低于烟气的露点时， 烟气中的水蒸汽和煤燃烧后所生 成的三氧化硫（只是硫的燃料产物的很少一部分）结合成的硫酸会凝结在受热面上， 严重腐蚀受热面。为避免锅炉尾部受热面的酸露腐蚀，通常锅炉排烟温度设计较高， 新锅炉 140°C左右， 运行一段时间后往往会高达 160°C， 这部分烟气的直接排放造成 了很大的能源浪费。对于这部分烟气余热的回收， 目前国内主要有低压省煤器、 热 管换热器及复合相变换热器等成熟技术。
低压省煤器技术在降低排烟温度上主要对象是国内大中型电厂的锅炉，它安装 在锅炉尾部烟道中，利用汽轮机回热系统中的低压加热器水侧的凝结水而非高压给 水来冷却烟气， 其换热条件类似于省煤器， 但水侧的压力远远低于省煤器的压力， 故称其低压省煤器。低压省煤器的安装使得汽轮机换热系统得到一份外来热量， 节 省了一部分抽气， 很好的回收排烟热损失， 提高了全厂的热效率。
然而低压省煤器与高压省煤器相比较， 在能源利用等级上稍差。 考虑到使用 低压省煤器后，凝结水温度升高，使回热抽气量减少，进入凝汽器的冷凝分量增加， 因而增加了排汽热损失，降低了循环效率。由于抽气量的减少，蒸汽做功量增加了， 这一部分才是使用低压省煤器系统之后的真实得益。
热管是依靠自身内部工作液体相变来实现传热的元件。 热管可分为蒸发段、 冷凝段两个部分， 当热源在蒸发段对其供热时， 工质自热源吸热汽化变为蒸汽， 蒸 汽在压差的作用下沿中间通道高速流向另一端，蒸汽在冷凝段向冷源放出潜热后冷 凝成液体； 工质在蒸发段蒸发时， 其气液交界面下凹， 形成许多弯月形液面， 产生 毛细压力， 液态工质在管芯毛细压力和重力等的回流动力作用下又返回蒸发段， 继 续吸热蒸发，如此循环往复，工质的蒸发和冷凝便把热量不断地从热端传递到冷端。 由于热管是利用工质的相变换热来传递热量，因此热管具有很大的传热能力和传热 效率。
复合相变换热器在热管的基础上又做了进一步的延伸， 把原先热管簇做了联 通， 使其内部介质可以任意的流动， 而且内部介质的工作压力可随负荷的变动而 随意的调整， 可以随时排放热管簇中的不凝气体。
由于前面所述的锅炉的排烟温度通常在 140~160°C左右，用上述的换热器来加 热锅炉的补给水都能起到很好的效果， 但是各行业客户的工艺需求不同， 很多客 户不需要这些低品位的热水而需要低压蒸汽，但上述排烟温度很难产生低压蒸汽。 因此， 目前缺少一种利用烟气余热产生低压饱和蒸汽的系统。 发明内容
本发明所要解决的技术问题是提供一种利用烟气余热产生低压蒸汽的系统， 克服现有技术中存在的上述问题。
本发明的一种利用烟气余热产生低压蒸汽的系统，包括设有多级受热面的锅炉 烟道， 其中末级受热面位于锅炉烟道的尾部， 还包括烟气余热蒸发器和烟气余热回 收利用装置， 烟气余热蒸发器加设于锅炉烟道中所述末级受热面之前， 烟气余热回 收利用装置包括相连的吸热段和放热段，吸热段加设于锅炉烟道中所述末级受热面 之后。
本发明所述末级受热面之后的锅炉烟道内还设有除尘脱硫装置， 所述吸热段 设于所述末级受热面和除尘脱硫装置之间。
本发明所述吸热段上设有温度传感器， 所述烟气余热蒸发器出气管道上设有 电动控制阀， 温度传感器和电动控制阀分别与一控制系统相连。
本发明所述锅炉烟道中按烟气流经方向依次设有省煤器和空气预热器， 所述 烟气余热蒸发器置于省煤器和空气预热器之间， 所述吸热段置于所述空气预热器 后方， 并所述放热段置于所述空气预热器的进口风道中。
本发明所述锅炉烟道中按烟气流经方向依次设有省煤器和两级空气预热器， 所述烟气余热蒸发器置于两级空气预热器之间， 所述吸热段置于第二级空气预热 器的后方， 并所述放热段置于第一级空气预热器的进口风道中。 通过以上技术方案， 本发明的利用烟气余热产生低压蒸汽的系统， 改变传统 锅炉烟道尾部受热面的布置顺序， 在不影响锅炉出力的情况下， 降低排烟温度， 回收烟气中的余热用于产生低压饱和蒸汽， 同时保证设备不受烟气酸露腐蚀的影 响。 附图说明
图 1为本发明利用烟气余热产生低压蒸汽的系统的一具体实施例示意图。 具体实施方式
本发明的一种利用烟气余热产生低压蒸汽的系统， 包括设有多级受热面的锅 炉烟道 4， 其中末级受热面位于锅炉烟道的尾部， 在下述两个具体实施例中末级受 热面分别指空气预热器 3和第二级空气预热器， 还包括烟气余热蒸发器 2和烟气余 热回收利用装置， 烟气余热蒸发器 2加设于锅炉烟道 4中末级受热面之前， 烟气余 热回收利用装置包括相连的吸热段 5和放热段 7，吸热段 5加设于锅炉烟道中末级受 热面之后。末级受热面之后的锅炉烟道内还设有除尘脱硫装置， 吸热段 5设于末级 受热面和除尘脱硫装置之间。 吸热段 5上设有温度传感器 6， 烟气余热蒸发器出气 管道上设有电动控制阀 8， 温度传感器 6和电动控制阀 8分别与一控制系统 9相连。
如图 1 所示， 本发明的一种利用烟气余热产生低压蒸汽的系统的一具体实施 例， 对于现有电站、 热电锅炉而言， 锅炉尾部烟道 4中按烟气流经方向设有省煤器 1 和空气预热器 3， 省煤器出口进空气预热器烟温一般在 30CTC左右， 此时空气预热 器为烟道中的末级受热面。本发明把烟气余热蒸发器 2安装在省煤器 1和空气预热器 3之间， 可以很容易产生 0.5Mpa左右的饱和蒸汽。 然而接入烟气余热蒸发器后， 由 于其吸收了一部分烟气热量， 必然造成空气预热器出口的风温和烟温的降低， 不光 使空气预热器吸热量降低， 由于排烟温度较低还可能造成酸露腐蚀。
为弥补烟气余热蒸发器 2吸收热量造成空气预热器 3吸收量的减少和排烟温度 的降低， 在空气预热器 3后加入一个烟气余热回收利用装置， 吸收部分烟气低品位 余热返还给空气预热器 3。 烟气余热回收利用装置包括相连的吸热段 5和放热段 7， 吸热段 5置于空气预热器 3的后方烟道中， 放热段 7置于空气预热器的进口风道中。 烟气余热回收利用装置吸收的热量返还给空气预热器， 由于空气预热器进口风温 的升高， 使空气预热器外部的烟气与内部的空气温差降低， 换热量减少， 空气预 热器出口烟气温度升高， 同时进入空气预热器的空气被烟气余热回收装置放热段 加热， 有效避免空气预热器的酸露腐蚀。
同时， 烟气余热回收利用装置的吸热段 5置于烟道中吸收热量传递给工作介 质， 工作介质再在放热段 7将热量传递给冷风， 工作介质的工作机理通常为高温强 制循环水或自然循环蒸汽， 因此其传热系数远高于烟气侧， 使得壁面温度由工作 介质侧温度决定， 通过控制工作介质的温度来控制烟气余热回收利用装置免受酸 露腐蚀。 在吸热段 5上加设温度传感器 6， 在烟气余热蒸发器的出气管道上加设电 动调节阀 8， 并温度传感器 6和电动调节阀 8分别与控制装置 9相连， 控制装置 9可随 锅炉负荷的变动随意调节壁温使其始终高于烟气酸露点温度， 最大程度回收排烟 余热。
本发明的工作原理为： 其各设备安装位置按烟气流向依次为： 省煤器 1、烟气 余热蒸发器 2、空气预热器 3、烟气余热回收利用装置吸热段 5和安装于锅炉空气预 热器进口风道中的烟气余热回收利用装置放热段 7， 然后去除尘脱硫装置。空气依 次流经烟气余热回收利用装置放热段 7、 空气预热器 3后进入炉膛。
烟气余热蒸发器 2吸收进入空气预热器 3的部分烟气余热用来产生低压饱和蒸 汽， 具体的吸热量根据烟气的酸露点温度计算来决定； 假设原锅炉系统空气预热器 3的出口排烟温度为 Ti， 酸露点温度为 T2， 为保证烟气余热回收利用装置吸热段 5不 受酸露腐蚀， 此时烟气余热回收利用装置 5与烟气接触的壁面温度应比 Τ2高， 留 10 °C的安全余量， 同时烟气的温度与烟气余热回收利用装置 5的壁面温度应留有一定 的传热温差才能保证烟气余热回收利用装置 5受热面的布置经济合理， 因此此时的 烟气余热回收利用装置吸热段 5排烟温度为 T2加上 10°C 的安全余量再加上约 15°C 的传热温差， 记为 T3， 可以计算出锅炉系统的节能温降空间为 T Τ3， 由于烟气余 热回收利用装置是用来补偿空气预热器的损失， 并没有对外提供热量， 因此真正回 收的节能量为烟气余热蒸发器 2的对外供热，显然烟气余热蒸发器 2的进出口温差不 能大于 T T3 , 这样才能保证锅炉热力系统不受加装烟气余热蒸发器的影响。
本发明一种利用烟气余热产生低压蒸汽的系统的另一实施例，上述锅炉烟道中 按烟气流经方向依次设有省煤器和两级空气预热器，则烟气余热蒸发器置于两级空 气预热器之间， 上述吸热段置于第二级空气预热器的后方， 并上述放热段置于第一 级空气预热器的进口风道中。 其他结构与上述实施例结构相同。 本发明的烟气余热回收利用装置吸收并改进了低压省煤器、热管换热器等结构 形式防止低温腐蚀，同时通过控制装置调整烟气余热回收利用装置放热段的放热量 来控制排烟温度， 最大程度利用烟气余热， 节能减排。

Claims

权利要求书
1. 一种利用烟气余热产生低压蒸汽的系统， 包括设有多级受热面的锅炉烟道
(4)， 其中末级受热面位于锅炉烟道的尾部， 其特征在于， 还包括烟气余热 蒸发器 （2) 和烟气余热回收利用装置， 烟气余热蒸发器 （2) 加设于锅炉烟 道（4)中所述末级受热面之前，烟气余热回收利用装置包括相连的吸热段（5) 和放热段 （7)， 吸热段 （5) 加设于锅炉烟道中所述末级受热面之后。
2. 根据权利要求 1所述的系统， 其特征在于， 所述末级受热面之后的锅炉烟道 内还设有除尘脱硫装置， 所述吸热段（5)设于所述末级受热面和除尘脱硫装 置之间。
3. 根据权利要求 1所述的系统， 其特征在于， 所述吸热段（5)上设有温度传感 器 （6)， 所述烟气余热蒸发器出气管道上设有电动控制阀 （8 )， 温度传感器
(6) 和电动控制阀 （8) 分别与一控制系统 （9) 相连。
4. 根据权利要求 1所述的系统， 其特征在于， 所述锅炉烟道（4) 中按烟气流经 方向依次设有省煤器 （1 ) 和空气预热器 （3)， 所述烟气余热蒸发器 （2) 置 于省煤器（1 )和空气预热器（3)之间， 所述吸热段 （5)置于所述空气预热 器 （3) 后方， 并所述放热段 （7) 置于所述空气预热器 （3) 的进口风道中。
5. 根据权利要求 1所述的系统， 其特征在于， 所述锅炉烟道中按烟气流经方向 依次设有省煤器和两级空气预热器， 所述烟气余热蒸发器置于两级空气预热 器之间， 所述吸热段置于第二级空气预热器的后方， 并所述放热段置于第一 级空气预热器的进口风道中。
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CN201973697U (zh) * 2011-01-21 2011-09-14 上海康洪精密机械有限公司 利用烟气余热产生低压蒸汽的系统
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CN102705863A (zh) * 2012-06-15 2012-10-03 黄绍新 锅炉及其空气预热系统
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