WO2021208437A1 - 一种转炉煤气烟气调质系统及其烟气调质方法 - Google Patents

一种转炉煤气烟气调质系统及其烟气调质方法 Download PDF

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WO2021208437A1
WO2021208437A1 PCT/CN2020/130462 CN2020130462W WO2021208437A1 WO 2021208437 A1 WO2021208437 A1 WO 2021208437A1 CN 2020130462 W CN2020130462 W CN 2020130462W WO 2021208437 A1 WO2021208437 A1 WO 2021208437A1
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flue gas
water
evaporative cooler
nitrogen
converter
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PCT/CN2020/130462
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English (en)
French (fr)
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施小东
郑立成
祝建军
傅远峰
庄向东
刘云
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浙江大维高新技术股份有限公司
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • the invention belongs to the field of converter gas dust removal systems, and specifically relates to a converter gas flue gas conditioning system and a flue gas conditioning method.
  • the converter gas electric dust removal system is a kind of special environmental protection equipment.
  • the working conditions of converter gas are complicated, the characteristics of dust in the flue gas vary greatly, and the specific resistance of the dust fluctuates in a wide range, which causes the electric precipitator to reduce the charging capacity of the dust in the flue gas, and the precipitator cannot reach the dust removal efficiency.
  • the phenomenon of back corona and corona sealing occurs, and frequent high-voltage breakdowns occur inside the electric field.
  • it is generally used to increase the flue gas conditioner or increase the moisture in the flue gas to increase the electrical conductivity of the flue gas dust.
  • the patent application number is CN200920318430.2
  • the patent name is a patent for an injection device for uniformly injecting the flue gas conditioner into the flue at the front end of the electrostatic precipitator, but the flue gas conditioner is a chemical agent, which has chemical pollution, and There is no advantage in cost.
  • the converter gas is a flammable and explosive gas, it contains a large amount of carbon monoxide gas. Oxygen in the air and carbon monoxide in the flue gas will explode under certain conditions, affecting the stable operation of the equipment.
  • the present invention is aimed at the problems of high pollution and high cost of using chemical agents for flue gas conditioning in the prior art, and converter gas is a flammable and explosive gas, and it is not suitable to use compressed air and water for atomization for conditioning.
  • the problem of the electrical conductivity of flue gas dust provides a safer flue gas conditioning system and conditioning method.
  • a converter gas flue gas conditioning system comprising a converter, a vaporization cooling flue, an evaporative cooler, an electric precipitator, an induced draft fan, and a flue gas modulation device, the converter, the vaporization cooling flue, an evaporative cooler, and an electric precipitator
  • the induced draft fans are connected in sequence; the inlet of the evaporative cooler is provided with a cooling water system, the inlet of the evaporative cooler is provided with an inlet temperature detection device, and the outlet of the evaporative cooler is provided with an outlet temperature detection device,
  • the inlet of the evaporative cooler is connected to the flue gas conditioning device through a pipeline, and the flue gas conditioning device includes a water inlet pipeline and a nitrogen pipeline, and the water inlet pipeline and the nitrogen pipeline are respectively connected to the pipeline ,
  • the water inlet pipeline, the nitrogen pipeline and the pipeline are respectively provided with valves.
  • the flue gas conditioning device inputs water mist atomized by nitrogen to the flue gas in the evaporative cooler, so that the moisture and the dust particles in the flue gas are fully combined, and the electrical conductivity of the particles is increased, so that the particles enter
  • the electrostatic precipitator is easier to charge, which improves the efficiency of dust removal.
  • Nitrogen is chemically inactive and will not react with flammable and explosive substances in the flue gas. Nitrogen accounts for up to 78% of the atmosphere. It is easy to obtain and has the lowest cost compared to other inert gases.
  • the water inlet pipeline is used to transport water or water vapor.
  • the nitrogen pipeline is used to transport high-pressure nitrogen.
  • High-pressure gas can make the water atomization effect better.
  • the input pressure of the high-pressure nitrogen gas is between 0.3 MPa and 1.5 MPa.
  • the valve has automatic switch and manual switch functions.
  • a method for flue gas conditioning includes the following steps:
  • the gas containing dust particles that is, the flue gas, enters the evaporative cooler;
  • the inlet temperature detection device and outlet temperature detection device on the evaporative cooler detect the temperature of the flue gas entering the evaporative cooler.
  • the smoke The air conditioning device is turned on;
  • Nitrogen and water or water vapor are atomized after mixing in a certain proportion, and then transported into the evaporative cooler through the pipeline and mixed with the flue gas in the evaporative cooler.
  • the moisture combines with the particulate matter in the flue gas to change the dust particulate matter in the flue gas
  • the electrical conductivity is higher, which makes it easier to charge after the dust enters the electrostatic precipitator;
  • the flue gas is attracted into the electrostatic precipitator through the induced draft fan, and the charged dust moves to the dust collecting pole under the action of the electric field force and deposits on it;
  • the gas purified by the electric precipitator is sent out through the induced draft fan.
  • the temperature of the flue gas entering the evaporative cooler cannot be lower than 180°C, and the temperature of the flue gas at the outlet of the evaporative cooler cannot be lower than 120°C .
  • the mixing ratio of the nitrogen and water is 1:100 to 1:500, or the mixing ratio of the nitrogen and water vapor is 1:0.5 to 1:10.
  • the amount of nitrogen used is about 10% of that when using water.
  • the inlet water temperature is controlled above 10°C, and the water vapor temperature is controlled above 120°C.
  • the flue gas conditioning device can be opened only when the cooling water system is closed.
  • the cooling water system is a spray system, which also has the function of adjusting the conductivity of the dust in the flue gas, but the spray water does not have the efficiency of atomizing water for the combination of particles and water. If the spraying water is at the same time, the atomizing water It also loses the advantages of high-efficiency combination with particulate matter.
  • the flue gas conditioning device is automatically closed.
  • the main function of flue gas conditioning is to change the electrical conductivity of the particulate matter in the flue gas.
  • the change in the electrical conductivity of the particulate matter is to improve the operating parameters of the electrostatic precipitator system, with high operating parameters and high dust removal efficiency.
  • this operating parameter has a relatively good dust removal effect. It also has a good dust removal efficiency without turning on the flue gas conditioning. Turning off the flue gas conditioning device can reduce the operating cost of the entire dust removal system.
  • the present invention has the following beneficial effects:
  • Nitrogen is chemically inactive, and the cost of acquisition is low.
  • the input evaporative cooler after nitrogen and water is mixed and atomized can inhibit explosion; after high atomization, the moisture and the particles in the flue gas can be better combined, and the dust particles in the flue gas are changed.
  • the electrical conductivity makes it easier to charge the dust after entering the electrostatic precipitator, increasing the dust removal efficiency.
  • Figure 1 is a structural diagram of an electric precipitator for converter gas.
  • a converter gas flue gas conditioning system includes a converter 1, a vaporization cooling flue 2, an evaporative cooler 4, an electrostatic precipitator 7, an induced draft fan 8 and a flue gas modulation device 9.
  • the converter 1 The evaporative cooling flue 2, the evaporative cooler 4, the electrostatic precipitator 7, and the induced draft fan 8 are connected in sequence; the inlet of the evaporative cooler 4 is provided with a cooling water system 3, and the inlet of the evaporative cooler 4 is provided with The inlet temperature detection device 5 is provided with an outlet temperature detection device 6 at the outlet of the evaporative cooler 4, and the inlet of the evaporative cooler 4 is connected to the flue gas conditioning device 9 through a pipeline 13, and the smoke
  • the gas modulating device 9 includes a water inlet pipe 10 and a nitrogen pipe 11.
  • the water inlet pipe 10 is used for conveying water or steam, and the nitrogen pipe 11 is used for conveying nitrogen with a pressure between 0.3 MPa and 1.5 Mpa.
  • the water inlet pipe 10 and the nitrogen pipe 11 are respectively connected to the pipe 13, and the water inlet pipe 10, the nitrogen pipe 11 and the pipe 13 are respectively provided with valves 12.
  • the valve 12 has automatic switch and manual switch functions. High-pressure gas can make the atomization effect of water better, and the chemical properties of nitrogen are inactive, and will not react with the flammable and explosive substances in the flue gas, and the proportion of nitrogen in the atmosphere is as high as 78%, which is easy to obtain. Compared with other inert gases, the cost is the lowest.
  • the gas containing dust particles that is, the flue gas, enters the evaporative cooler 4;
  • the inlet temperature detection device 5 and outlet temperature detection device 6 on the evaporative cooler 4 detect the temperature of the flue gas entering the evaporative cooler.
  • the temperature at the outlet is greater than 120 At °C, the flue gas conditioning device 9 is turned on;
  • Nitrogen and water or water vapor are atomized after being mixed in a certain proportion, and then transported into the evaporative cooler 4 through the pipeline 13 and mixed with the flue gas in the evaporative cooler 4.
  • the moisture combines with the particulate matter in the flue gas to change the flue gas.
  • the conductivity of the medium dust particles makes it easier to charge after the dust enters the electrostatic precipitator 7;
  • the flue gas is attracted into the electrostatic precipitator 7 through the induced draft fan 8, and the charged dust moves to the dust collecting pole under the action of the electric field force and deposits on it;
  • the gas purified by the electric precipitator 7 is sent out through the induced draft fan 8.
  • the temperature of the flue gas entering the evaporative cooler 4 cannot be lower than 180°C, and the temperature of the flue gas at the outlet of the evaporative cooler 4 cannot be lower At 120°C.
  • the mixing ratio of the nitrogen and water is 1:100 to 1:500, or the mixing ratio of the nitrogen and water vapor is 1:0.5 to 1:10.
  • the amount of nitrogen used is about 10% of that when using water.
  • the temperature of the inlet water is controlled to be above 10°C, and the temperature of the water vapor is controlled to be above 120°C.
  • the flue gas conditioning device 9 can only be opened when the cooling water system 3 is closed.
  • the cooling water system 3 is a spray system, which also has the function of adjusting the conductivity of the dust in the flue gas, but the spray water does not have the atomized water to effectively combine the particles with the water. If the spray water is at the same time, the atomization Water also loses the advantage of efficiently combining with particulate matter.
  • the flue gas conditioning device 9 is automatically turned off.
  • the main function of flue gas conditioning is to change the electrical conductivity of the particulate matter in the flue gas.
  • the electrical conductivity of the particulate matter is changed to improve the operating parameters of the electrostatic precipitator system. The operating parameters are high and the dust removal efficiency is high.

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  • Environmental & Geological Engineering (AREA)
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Abstract

一种转炉煤气烟气调质系统及其烟气调质方法，属于转炉煤气除尘系统技术领域，包括进水管路（10）和氮气管路（11），氮气与水或水蒸气混合可使水雾化，混合雾化后经管路接入蒸发冷却器（4）入口，雾化后的水在蒸发冷却器（4）中内进一步被汽化，水分子与烟气中颗粒物结合，改变了烟气中粉尘颗粒物的导电率，使粉尘进入电除尘器（7）后更容易荷电。且氮气化学性质不活泼，与烟气充分接触不会发生爆炸的风险。

Description

一种转炉煤气烟气调质系统及其烟气调质方法 技术领域
本发明属于转炉煤气除尘系统领域，具体涉及一种转炉煤气烟气调质系统及其烟气调质方法。
背景技术
转炉煤气电除尘系统是一种专用特种环保装备。转炉煤气工况变化复杂，烟气中的粉尘特性变化很大，粉尘比电阻大范围波动，导致电除尘器对烟气中粉尘的荷电能力下降，除尘器达不到应有的除尘效率。严重的情况，粉尘进入到电除尘器后，发生反电晕、电晕封闭的现象，电场内部出现频繁的高压击穿。为了增加烟气中粉尘的电导率，一般采用在烟气中增加烟气调质剂或增加烟气中的水分，来增加烟气粉尘的电导率。
如专利申请号为CN200920318430.2，专利名称为用于电除尘器前端烟道均匀喷入烟气调质剂的注入装置的专利，但是烟气调质剂为化学药剂，具有化学污染性，且成本上没有优势。
如果用压缩空气与水混合雾化，使雾化后的水颗粒与烟气中的粉尘颗粒结合，来增加粉尘电导率，由于转炉煤气是易燃易爆气体，里面含有大量的一氧化碳气体，压缩空气中的氧气与烟气中的一氧化碳在某些条件下会发生爆炸，影响设备的稳定运行。
发明内容
本发明针对现有技术中使用化学药剂来进行烟气调质具有污染高和成本高的问题，和转炉煤气属于易燃易爆的气体，不适宜用压缩空气和水来进行雾化以调质烟气粉尘电导率的问题，提供一种更加安全的烟气调质系统及其调质方法。
本发明的发明目的是通过以下技术方案实现的：
一种转炉煤气烟气调质系统，包括转炉、汽化冷却烟道、蒸发冷却器、电除尘器、引风机和烟气调制装置，所述转炉、汽化冷却烟道、蒸发冷却器、电除尘器、引风机依次连接；所述蒸发冷却器的入口内设置有冷却水系统，所述蒸发冷却器的入口处设有入口温度检测装置，所述蒸发冷却器的出口处设有出口温度检测装置，所述蒸发冷却器的入口处通过管路和所述烟气调质装置连接，所述烟气 调制装置包括进水管路和氮气管路，所述进水管路和氮气管路分别与管路相连，所述进水管路、氮气管路和管路上分别设有阀门。
上述方案中，烟气调质装置通过向蒸发冷却器内的烟气输入经氮气雾化后的水雾，使水分与烟气中的粉尘颗粒物充分结何，增加颗粒物的电导率，使颗粒物进入电除尘器的时候更容易荷电，提高除尘效率。氮气化学性质不活泼，不会和烟气中的易燃易爆物质发生反应，且氮气在大气中的占比高达78％，很容易获取，相比其他惰性气体来说成本最低。
作为优选，所述进水管路用于输送水或水蒸气。
作为优选，所述氮气管路用于输送高压氮气。高压气体能使水的雾化效果更好。
作为优选，所述高压氮气的输入压强在0.3MPa～1.5Mpa之间。
作为优选，所述阀门具有自动开关和手动开关功能。
一种烟气调质方法，包括如下步骤：
转炉煤气经过气化冷却烟道冷却后，含有粉尘颗粒物的煤气，即烟气进入蒸发冷却器；
蒸发冷却器上的入口温度检测装置和出口温度检测装置检测进入蒸发冷却器的烟气温度，当烟气在蒸发冷却器的入口处的温度大于180℃，出口处的温度大于120℃时，烟气调质装置开启；
氮气和水或水蒸气经过一定比例的混合后雾化，经管路输送进蒸发冷却器，与蒸发冷却器内的烟气混合，水份与烟气中的颗粒物结合，改变了烟气中粉尘颗粒物的电导率，使粉尘进行入电除尘器后更加容易荷电；
烟气通过引风机吸引进电除尘器，荷电粉尘在电场力的作用下向集尘极运动，并在其上沉积；
经电除尘器净化后的煤气通过引风机送出。
上述方法中，为了防止烟气中的粉尘对蒸发冷却器的出口和入口堵灰，进入蒸发冷却器的烟气温度不能低于180℃，蒸发冷却器出口处的烟气温度不能低于120℃。
作为优选，所述氮气和水的混合比例为1:100～1:500，或者所述氮气和水蒸气的混合比例为1:0.5～1:10。用水蒸气时，氮气用量是用水时的10％左右。
作为优选，所述进水温控制在10℃以上，所述水蒸气温度控制在120℃以上。
作为优选，所述烟气调质装置只有在冷却水系统关闭的条件下才能打开。冷却水系统为喷淋系统，同样具有调节烟气中的粉尘的电导率的功能，但是喷淋水没有雾化水对颗粒物与水的结合有效率，如果喷淋水在的同时，雾化水也就失去了与颗粒物高效结合的优点。
作为优选，所述电除尘器的二次电压、二次电流同时大于额定值50％以上时，所述烟气调质装置自动关闭。烟气调质的主要作用是改变烟气中颗粒物的电导率，颗粒物的电导率改变就是为了提高电除尘系统的运行参数，运行参数高，除尘效率高。当一般电除尘器电源二次电压、二次电流同时满足大于额定值百分之五十以上，这个运行参数，除尘效果是比较好的，不开启烟气调质，也有很好的除尘效率。关闭烟气调质装置可以降低整个除尘系统的运行成本。
与现有技术相比，本发明具有以下有益效果：
氮气化学性质不活泼，获取成本低，氮气与水混合雾化后的输入蒸发冷却器可以抑制爆炸；高度雾化后水分和烟气中的颗粒物能更好的结合，改变了烟气中粉尘颗粒物的电导率，使粉尘进入电除尘器后更加容易荷电，增加除尘效率。
附图说明
图1为转炉煤气电除尘器的结构图。
图中标记：1、转炉；2、汽化冷却烟道；3、冷却水系统；4、蒸发冷却器；5、入口温度检测装置；6、出口温度检测装置；7、电除尘器；8、引风机；9、烟气调制装置；10、进水管路；11、氮气管路；12、阀门；13、管路。
具体实施方式
下面结合附图所表示的实施例对本发明作进一步描述：
实施例1
如图1所示，一种转炉煤气烟气调质系统，包括转炉1、汽化冷却烟道2、蒸发冷却器4、电除尘器7、引风机8和烟气调制装置9，所述转炉1、汽化冷却烟道2、蒸发冷却器4、电除尘器7、引风机8依次连接；所述蒸发冷却器4的入口内设置有冷却水系统3，所述蒸发冷却器4的入口处设有入口温度检测装置5，所述蒸发冷却器4的出口处设有出口温度检测装置6，所述蒸发冷却器4的入口处通过管路13和所述烟气调质装置9连接，所述烟气调制装置9包括进水 管路10和氮气管路11，进水管路10用于输送水或水蒸气，氮气管路11用于输送压力在0.3MPa～1.5Mpa之间的氮气。所述进水管路10和氮气管路11分别与管路13相连，所述进水管路10、氮气管路11和管路13上分别设有阀门12。阀门12具有自动开关和手动开关功能。高压气体能使水的雾化效果更好，且氮气化学性质不活泼，不会和烟气中的易燃易爆物质发生反应，且氮气在大气中的占比高达78％，很容易获取，相比其他惰性气体来说成本最低。
利用该转炉煤气烟气调质系统的烟气调质方法，其步骤如下：
转炉煤气经过气化冷却烟道冷2却后，含有粉尘颗粒物的煤气，即烟气进入蒸发冷却器4；
蒸发冷却器4上的入口温度检测装置5和出口温度检测装置6检测进入蒸发冷却器的烟气温度，当烟气在蒸发冷却器4的入口处的温度大于180℃，出口处的温度大于120℃时，烟气调质装置9开启；
氮气和水或水蒸气经过一定比例的混合后雾化，经管路13输送进蒸发冷却器4，与蒸发冷却器4内的烟气混合，水份与烟气中的颗粒物结合，改变了烟气中粉尘颗粒物的电导率，使粉尘进行入电除尘器7后更加容易荷电；
烟气通过引风机8吸引进电除尘器7，荷电粉尘在电场力的作用下向集尘极运动，并在其上沉积；
经电除尘器7净化后的煤气通过引风机8送出。
上述方法中，为了防止烟气中的粉尘对蒸发冷却器4的出口和入口堵灰，进入蒸发冷却器4的烟气温度不能低于180℃，蒸发冷却器4出口处的烟气温度不能低于120℃。所述氮气和水的混合比例为1:100～1:500，或者所述氮气和水蒸气的混合比例为1:0.5～1:10。用水蒸气时，氮气用量是用水时的10％左右。所述进水温控制在10℃以上，所述水蒸气温度控制在120℃以上。所述烟气调质装置9只有在冷却水系统3关闭的条件下才能打开。冷却水系统3为喷淋系统，同样具有调节烟气中的粉尘的电导率的功能，但是喷淋水没有雾化水对颗粒物与水的结合有效率，如果喷淋水在的同时，雾化水也就失去了与颗粒物高效结合的优点。所述电除尘器7的二次电压、二次电流同时大于额定值50％以上时，所述烟气调质装置9自动关闭。烟气调质的主要作用是改变烟气中颗粒物的电导率，颗粒物的电导率改变就是为了提高电除尘系统的运行参数，运行参数高，除尘效率 高。当一般电除尘器电源二次电压、二次电流同时满足大于额定值百分之五十以上，这个运行参数，除尘效果是比较好的，不开启烟气调质，也有很好的除尘效率。关闭烟气调质装置9可以降低整个除尘系统的运行成本。
文中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。

Claims (10)

  1. 一种转炉煤气烟气调质系统，包括转炉(1)、汽化冷却烟道(2)、蒸发冷却器(4)、电除尘器(7)、引风机(12)和烟气调制装置(9)，所述转炉(1)、汽化冷却烟道(2)、蒸发冷却器(4)、电除尘器(7)、引风机(12)依次连接；所述蒸发冷却器(4)的入口内设置有冷却水系统(3)，所述蒸发冷却器(4)的入口处设有入口温度检测装置(5)，所述蒸发冷却器(4)的出口处设有出口温度检测装置(6)，所述蒸发冷却器(4)的入口处通过管路(13)和所述烟气调质装置(9)连接，其特征在于,所述烟气调制装置(9)包括进水管路(10)和氮气管路(11)，所述进水管路(10)和氮气管路(11)分别与管路(13)相连，所述进水管路(10)、氮气管路(11)和管路(13)上分别设有阀门(12)。
  2. 根据权利要求1所述一种转炉煤气烟气调质系统，其特征在于，所述进水管路(10)用于输送水或水蒸气。
  3. 根据权利要求1所述的一种转炉煤气烟气调质系统，其特征在于，所述氮气管路(11)用于输送高压氮气。
  4. 根据权利要求1或3所述的一种转炉煤气烟气调质系统，其特征在于，所述高压氮气的输入压强在0.3MPa～1.5Mpa之间。
  5. 根据权利要求1所述的一种转炉煤气烟气调质系统，其特征在于，所述阀门(12)具有自动开关和手动开关功能。
  6. 一种利用权利要求1所述的转炉煤气烟气调质系统的烟气调质方法，其特征在于：包括如下步骤：
    转炉煤气经过气化冷却烟道(2)冷却后，含有粉尘颗粒物的煤气，即烟气进入蒸发冷却器(4)；
    蒸发冷却器(4)上的入口温度检测装置(5)和出口温度检测装置(6)检测进入蒸发冷却器(4)的烟气温度，当烟气在蒸发冷却器(4)的入口处的温度大于180℃，出口处的温度大于120℃时，烟气调质装置开启；
    氮气和水或水蒸气经过一定比例的混合后雾化，经管路(13)输送进蒸发冷却器(4)，与蒸发冷却器(4)内的烟气混合，水份与烟气中的颗粒物结合，改变了烟气中粉尘颗粒物的电导率，使粉尘进行入电除尘器(7)后更加容易荷电；
    烟气通过引风机(8)吸引进电除尘器(7)，荷电粉尘在电场力的作用下向集尘极运动，并在其上沉积；
    经电除尘器(7)净化后的煤气通过引风机(8)送出。
  7. 根据权利要求5所述的一种烟气调质方法，其特征在于，所述氮气和水的混合比例为 1:100～1:500，或者所述氮气和水蒸气的混合比例为1:0.5～1:10。
  8. 根据权利要求5或6所述的一种烟气调质方法，其特征在于，所述进水温控制在10℃以上，所述水蒸气温度控制在120℃以上。
  9. 根据权利要求5所述的一种烟气调质方法，其特征在于，所述烟气调质装置只有在冷却水系统(3)关闭的条件下才能打开。
  10. 根据权利要求5所述的一种烟气调质方法，其特征在于，所述电除尘器(7)的二次电压、二次电流同时大于额定值50％以上时，所述烟气调质装置自动关闭。
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