煙氣脫硝技術(shù)特點(diǎn)：SCR脫硝技術(shù)具有脫硝效率、適應(yīng)當(dāng)前環(huán)保要求等優(yōu)點(diǎn)，受到電力行業(yè)的高度重視和廣泛應(yīng)用。在環(huán)保要求嚴(yán)格的發(fā)達(dá)國(guó)家，如德國(guó)、日本、美國(guó)、加拿大、荷蘭、奧地利、瑞典、丹麥等國(guó)家，SCR脫硝技術(shù)已成為應(yīng)用更廣泛、更成熟的技術(shù)之一。

Characteristics of flue gas denitration technology: SCR denitration technology has the advantages of denitrification efficiency and meets the current environmental protection requirements, and has been highly valued and widely used by the power industry. SCR denitration technology has become one of the most widely used and mature technologies in developed countries with strict environmental protection requirements, such as Germany, Japan, the United States, Canada, the Netherlands, Austria, Sweden, Denmark and other countries.

經(jīng)過(guò)脫硝反應(yīng)后再通過(guò)SCR反應(yīng)器出口煙道回到空氣預(yù)熱器, 典型布置如圖2所示。典型高塵布置設(shè)計(jì)方式, 在SCR反應(yīng)器入口和出口煙道均需設(shè)計(jì)排灰斗(特別是對(duì)于高粉塵煙氣), 這樣, 不但可以有效減小催化劑的磨損, 而且可以有效減輕空氣預(yù)熱器的堵塞和磨損, 同時(shí)也可以減少脫硝還原劑的消耗量,保證系統(tǒng)安全、穩(wěn)定運(yùn)行。

After denitrification, the flue at the outlet of SCR reactor is returned to the air preheater. The typical arrangement is shown in Fig. 2. The typical design mode of high dust arrangement requires the design of ash discharge hopper (especially for high dust flue gas) at the inlet and outlet flue of SCR reactor. In this way, not only the catalyst wear can be effectively reduced, but also the blockage and wear of air preheater can be effectively reduced, and the consumption of denitration reducing agent can be reduced, and the system can be safely and stably operated.

脫硝系統(tǒng)調(diào)試，脫硝系統(tǒng)調(diào)試是保證系統(tǒng)運(yùn)行的穩(wěn)定性、可靠性以及能否達(dá)到設(shè)計(jì)性能保證值更重要的工作之一。

The commissioning of denitration system is one of the most important tasks to ensure the stability, reliability and the design performance of the system.

催化劑砷中毒后，氨不易吸附到中毒的催化劑活性點(diǎn)上，從而導(dǎo)致催化劑活性的降低。在使用過(guò)程中可使催化劑表面對(duì)砷不具有活性

After arsenic poisoning, ammonia is not easily adsorbed to the active point of the catalyst, which leads to the decrease of catalyst activity. The catalyst surface can be inactive to arsenic during the use,

脫硝煙道灰斗，SCR法煙氣脫硝裝置的布置方式根據(jù)反應(yīng)器布置位置的不同, 通?？煞譃楦邏m布置與低塵布置。高塵布置的SCR反應(yīng)器通常布置在鍋爐省煤器與空氣預(yù)熱器之間, 受布置空間所限, SCR反應(yīng)器不能直接布置在鍋爐省煤器下(立式鍋爐除外),而是煙氣通過(guò)水平煙道引出后再通過(guò)上升煙道連接SCR反應(yīng)器,

The arrangement of ash hopper and SCR Flue gas denitration device can be divided into high dust arrangement and low dust arrangement according to the different arrangement position of reactor. SCR reactors with high dust arrangement are usually arranged between boiler economizer and air preheater. Restricted by the layout space, SCR reactors cannot be directly arranged under boiler economizer (except vertical boilers), but flue gas is led out through horizontal flue and connected to SCR reactor through rising flue,

根據(jù)發(fā)達(dá)國(guó)家的經(jīng)驗(yàn)，SCR脫硝技術(shù)必將成為我國(guó)火電廠燃煤鍋爐的主要脫硝技術(shù)，并得到越來(lái)越廣泛的應(yīng)用。SCR法脫硝關(guān)鍵技術(shù)，工程上常用的、成熟的脫硝技術(shù)主要有低氮燃燒技術(shù)、SNCR法煙氣脫硝技術(shù)、SCR法煙氣脫硝技術(shù), 本文僅針對(duì)工程上應(yīng)用更多、脫硝效率高的SCR法煙氣脫硝技術(shù)進(jìn)討。

According to the experience of developed countries, SCR denitrification technology will become the main denitrification technology of coal-fired boiler in thermal power plants in China, and it will be widely used. SCR denitrification key technology, commonly used in engineering, mature denitrification technology mainly includes low nitrogen combustion technology, SNCR flue gas denitrification technology, SCR Flue Gas Denitrification Technology, this paper only discusses SCR Flue gas denitration technology which has the most application in the project and high denitrification efficiency.

通過(guò)對(duì)催化劑表面的酸性控制，達(dá)到吸附保護(hù)的目的，使得催化劑表面不吸附氧化砷；另一種方法是改進(jìn)活性位，通過(guò)高溫煅燒獲得穩(wěn)定的催化劑表面，

The purpose of adsorption protection is achieved by controlling the acidity of catalyst surface, so that arsenic oxide is not adsorbed on the catalyst surface; another method is to improve the active position and obtain stable catalyst surface by calcination at high temperature,

著重在設(shè)計(jì)并制備高活性的催化劑上，改進(jìn)催化劑的組成，提高活性，降低成本，提高催化劑壽命。催化劑在實(shí)際工程應(yīng)用中，要通過(guò)合理的流場(chǎng)設(shè)計(jì) ，瓦斯發(fā)電機(jī)scr脫硝

The design and preparation of high activity catalyst are emphasized, which can improve the composition of catalyst, improve the activity, reduce the cost and improve the catalyst life. In practical engineering application, catalyst should be denitrated by SCR of gas generator through reasonable flow field design

流場(chǎng)模擬試驗(yàn)，進(jìn)入反應(yīng)器催化劑層入口的煙氣流場(chǎng)分布均勻與否直接影響脫硝系統(tǒng)的各項(xiàng)性能指標(biāo), 如果流場(chǎng)分布不均勻, 不但會(huì)嚴(yán)重影響脫硝效率、增加氨的逃逸、加速催化劑磨損, 嚴(yán)重時(shí)還會(huì)堵塞催化劑或引起空氣預(yù)熱器的堵塞和嚴(yán)重腐蝕, 從而影響主機(jī)的正常運(yùn)行, 因此, 流場(chǎng)模擬試驗(yàn)研究在脫硝系統(tǒng)設(shè)計(jì)中極為重要。

The flow field simulation test shows that the distribution of flue gas flow into the catalyst layer inlet of the reactor directly affects the performance indexes of denitration system. If the flow field distribution is not uniform, it will not only seriously affect denitration efficiency, increase ammonia escape, accelerate catalyst wear, but also block catalyst or cause blockage and serious corrosion of air preheater, Therefore, the simulation experiment of flow field is very important in the design of denitration system.

典型流場(chǎng)設(shè)計(jì)要求的反應(yīng)器頂層催化劑層入口煙氣條件見表2, 如果要求脫硝效率達(dá)到85%以上, 則催化劑層入口的煙氣條件還要更嚴(yán)格。流場(chǎng)模擬試驗(yàn)研究主要分為計(jì)算流體力學(xué)CFD計(jì)算與物理模型試驗(yàn)驗(yàn)證2部分。CFD計(jì)算更為關(guān)鍵的是計(jì)算模型的建立與邊界條件的設(shè)定,

The flue gas conditions at the top catalyst layer of typical flow field design are shown in Table 2. If denitrification efficiency is required to reach more than 85%, the flue gas conditions at the entrance of catalyst layer should be more strict. The flow field simulation experiment is divided into two parts: CFD calculation and physical model test verification. The most important thing in CFD calculation is the establishment of calculation model and setting of boundary conditions,

防止飛灰的沉積，定期對(duì)催化劑進(jìn)行吹掃；控制好溫度，防止催化劑燒結(jié)；催化劑停用時(shí)要對(duì)催化劑進(jìn)行保護(hù)。

Prevent the deposition of fly ash, purge the catalyst regularly; control the temperature to prevent the catalyst sintering; protect the catalyst when the catalyst is out of service.

更多的關(guān)于瓦斯發(fā)電機(jī)組的問題或者詳細(xì)的內(nèi)容，請(qǐng)進(jìn)入我們公司的網(wǎng)站：http://m.elmasticar.com 網(wǎng)站中會(huì)有很多的內(nèi)容僅供參考。

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