WO2017054320A1 - 一种烟气余热回收装置 - Google Patents

一种烟气余热回收装置 Download PDF

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Publication number
WO2017054320A1
WO2017054320A1 PCT/CN2015/096996 CN2015096996W WO2017054320A1 WO 2017054320 A1 WO2017054320 A1 WO 2017054320A1 CN 2015096996 W CN2015096996 W CN 2015096996W WO 2017054320 A1 WO2017054320 A1 WO 2017054320A1
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Prior art keywords
unit
flue gas
outlet
heat exchanger
steam
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PCT/CN2015/096996
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English (en)
French (fr)
Inventor
赵玺灵
付林
魏茂林
张世钢
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清华大学
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Application filed by 清华大学 filed Critical 清华大学
Publication of WO2017054320A1 publication Critical patent/WO2017054320A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters

Definitions

  • the present invention relates to a heating device, and more particularly to a low nitrogen efficient flue gas waste heat recovery device.
  • the volume component of water vapor is close to 20%, which is the main carrier of the heat of the flue gas.
  • every 1Nm 3 of natural gas can produce 1.55kg of water vapor, and the latent heat is about 3600KJ/Nm 3 , which accounts for about 10% of the low calorific value of natural gas. Therefore, the recovery of this part of water vapor and its heat (mainly latent heat) is economically It makes a lot of sense.
  • the prior art discloses a heating device for recycling latent heat of water vapor in a gas and oil boiler flue gas, which comprises a boiler, a condensing heat exchanger, a heating pipe and a generator, a solution exchanger, an absorber, and an evaporator.
  • the absorption heat pump composed of a condenser and a connecting pipe uses flue gas as a low-temperature heat source, and uses an absorption heat pump to recover waste heat of the flue gas.
  • the heating device has a complicated structure, is difficult to manufacture, and has high cost.
  • the flue gas condensation heat exchanger has a low heat transfer coefficient, resulting in a large volume of equipment, consumables and cost; and the flue gas condensation heat exchanger does not It affects the concentration of nitrogen oxides in the flue gas, and the whole set of equipment for recovering waste heat from flue gas does not have the effect of reducing nitrogen.
  • the prior art also discloses a centralized heating system for recovering waste heat of flue gas by using an absorption heat pump, which improves the above-mentioned heating device, and replaces the partition wall heat exchange with a flue gas-water direct contact heat exchanger.
  • the device greatly reduces the volume and cost, and at the same time, the concentration of nitrogen oxides in the exhaust gas can be reduced to some extent by the spraying effect of water on the flue gas.
  • the manufacturing difficulty and cost of the absorption heat pump are still large, the exhaust gas is in a saturated state, and it is easy to cause condensation condensation on the tail flue, and only by treating the flue gas at the tail of the boiler, The effect of reducing the concentration of nitrogen oxides is very limited.
  • the prior art also discloses a flue gas waste heat recovery system based on a solution absorption cycle, in which the heat of the high temperature section of the flue gas is used as a driving heat source to heat the concentrated solution in the generator, due to the reduction of the heat exchange link, the volume of the device and The cost is reduced, and the smoke is emitted at the same time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)

Abstract

一种烟气余热回收装置，包括烟气单元（1）、加湿器单元（2）、汽水换热器单元（3）和干燥器单元（4）。烟气单元（1）包括燃烧器（11）和燃烧室（12），燃烧器（11）的进口连接加湿器单元（2）的空气出口，燃烧器（11）的出口连接燃烧室（12）的进口；燃烧室（12）的烟气出口连接汽水换热器单元（3）的烟气进口，汽水换热器单元（3）的烟气出口连接干燥器单元（4）的烟气进口；干燥器单元（4）的烟气出口通向烟囱连通外界，干燥器单元（4）的热水出口分为两路，一路通过管路向外溢流，另一路进入加湿器单元（2），加湿器单元（2）的冷水出口通过干燥器喷淋泵（5）连接干燥器单元（4）的冷水进口；汽水换热器单元（3）的热水通过管路向外溢流，汽水换热器单元（3）的回水进口连接热水回水管路，汽水换热器单元（3）的供水出口连接热水供水管路。

Description

[根据细则37.2由ISA制定的发明名称]　一种烟气余热回收装置 技术领域
本发明涉及一种供热装置，特别是关于一种低氮高效的烟气余热回收装置。
背景技术
天然气、油以及生物质等燃料含氢量很高，因而燃烧后排出的烟气中含有大量的水蒸气。比如天然气锅炉的烟气中，水蒸气的容积成分接近20％，是烟气热量的主要携带者。据统计每1Nm3天然气可以产生1.55kg水蒸气，潜热大约为3600KJ/Nm3，占天然气低位发热量的10％左右，因此，这部分水蒸气以及其热量(主要是潜热)的回收在经济上是很有意义的。此外，国家环保部提出在2017年4月1日起对燃气锅炉氮氧化物排放实施新标准，新标准要求氮氧化物浓度需降低至30mg/m3以下，因此，采取有效措施降低燃气锅炉氮氧化物排放也迫在眉睫。
现有技术公开了一种回收利用燃气、燃油锅炉烟气中水蒸气潜热的供热装置，其包括锅炉、冷凝热交换器、供热管和由发生器、溶液交换器、吸收器、蒸发器、冷凝器以及连接管构成的吸收式热泵，以烟气作为低温热源，利用吸收式热泵回收烟气余热。但是该供热装置结构复杂，设备制造难度大，成本高，特别是烟气冷凝换热器因传热系数低，造成设备体积庞大，耗材与成本极大；而且烟气冷凝换热器不会对烟气中氮氧化物的浓度产生影响，整套回收烟气余热供热的装置并没有降氮的效果。现有技术中还公开了一种利用吸收式热泵回收烟气余热的集中供热系统，其对上述供热装置进行了改进，用烟气-水直接接触式换热器代替了间壁式换热器，大幅度降低了体积以及成本，同时通过水对烟气的喷淋作用，能够在一定程度上降低排烟中氮氧化物浓度。但是在该集中供热系统中，吸收式热泵的制造难度及成本仍然较大，排放烟气处于饱和状态，易造成尾部烟道的结露腐蚀，而且仅仅通过对锅炉尾部烟气的处理，对氮氧化物浓度的降低效果很有限。现有技术中还公开了一种基于溶液吸收循环的烟气余热回收系统，在该系统中烟气高温段热量作为驱动热源在发生器内加热浓缩溶液，由于换热环节的减少，设备体积和成本都有所降低，同时排放的烟气

Claims (1)

  1. Figure PCTCN2015096996-appb-100001
PCT/CN2015/096996 2015-09-28 2015-12-10 一种烟气余热回收装置 WO2017054320A1 (zh)

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Cited By (5)

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CN108731022A (zh) * 2018-06-12 2018-11-02 江苏双良低碳产业技术研究院有限公司 一种白色烟羽治理及能量回收系统
CN108756993A (zh) * 2018-07-21 2018-11-06 中环智创（北京）科技有限公司 一种大温差矿井回风热能回收系统
CN110818220A (zh) * 2019-11-04 2020-02-21 首创环投控股有限公司 一种污泥低温干化耦合热解系统
CN115090072A (zh) * 2022-06-10 2022-09-23 光大环境科技（中国）有限公司 一种节能节水的烟气处理装置和方法
CN110818220B (zh) * 2019-11-04 2024-06-04 首创环投控股有限公司 一种污泥低温干化耦合热解系统

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CN105605647A (zh) * 2016-02-03 2016-05-25 清华大学 一种协同净化、全热回收型热电联产系统
CN107559873A (zh) * 2016-06-30 2018-01-09 保定市金能换热设备有限公司 一种超低氮氧化物排放超高热效率燃气炉系统
CN106765253A (zh) * 2016-12-23 2017-05-31 北京建筑大学 一种卧式喷淋式烟气余热梯级利用系统
CN107166420A (zh) * 2017-06-12 2017-09-15 清华大学 基于水蒸气载热循环的锅炉排烟热湿直接回收方法及装置
CN107559861A (zh) * 2017-09-08 2018-01-09 清华大学 基于锅炉排烟凝结水载热循环的三塔合一换热方法及装置
CN108105796B (zh) * 2018-01-05 2023-11-07 山东大学 一种低氮排放高效天然气锅炉
CN109268820B (zh) * 2018-09-20 2020-02-18 北京建筑大学 助燃空气与燃气加湿的燃气锅炉烟气余热回收净化系统
CN110044062B (zh) * 2019-04-28 2024-03-29 北京热科能源技术研究有限公司 一种热水机组

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CN108731022A (zh) * 2018-06-12 2018-11-02 江苏双良低碳产业技术研究院有限公司 一种白色烟羽治理及能量回收系统
CN108731022B (zh) * 2018-06-12 2024-04-02 江苏双良低碳产业技术研究院有限公司 一种白色烟羽治理及能量回收系统
CN108756993A (zh) * 2018-07-21 2018-11-06 中环智创（北京）科技有限公司 一种大温差矿井回风热能回收系统
CN110818220A (zh) * 2019-11-04 2020-02-21 首创环投控股有限公司 一种污泥低温干化耦合热解系统
CN110818220B (zh) * 2019-11-04 2024-06-04 首创环投控股有限公司 一种污泥低温干化耦合热解系统
CN115090072A (zh) * 2022-06-10 2022-09-23 光大环境科技（中国）有限公司 一种节能节水的烟气处理装置和方法

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