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生物質(zhì)鍋爐煙氣脫硝注意事項(xiàng)

生物質(zhì)鍋爐在運(yùn)行過程中,由于其燃料特性及燃燒方式的特殊性,容易產(chǎn)生氮氧化物(NOx),對(duì)環(huán)境造成污染。因此,脫硝技術(shù)的應(yīng)用顯得尤為重要。以下是關(guān)于生物質(zhì)鍋爐脫硝的一些注意事項(xiàng):

During the operation of biomass boilers, due to the unique characteristics of their fuel and combustion methods, nitrogen oxides (NOx) are easily generated, causing environmental pollution. Therefore, the application of denitrification technology is particularly important. Here are some precautions regarding denitrification of biomass boilers:

選擇合適的脫硝技術(shù):

Choose the appropriate denitrification technology:

SNCR(選擇性非催化還原) :適用于爐內(nèi)脫硝,通過將還原劑如尿素溶液噴入高溫區(qū)進(jìn)行反應(yīng),但其效率較低,通常在20%到50%之間。

SNCR (Selective Non Catalytic Reduction): Suitable for denitrification in furnaces, it involves injecting a reducing agent such as urea solution into a high-temperature zone for reaction, but its efficiency is relatively low, usually between 20% and 50%.

SCR(選擇性催化還原) :利用NH3或尿素作為還原劑,在金屬催化劑的作用下進(jìn)行脫硝,具有較高的脫硝效率,但需要對(duì)鍋爐本體進(jìn)行改造。

SCR (Selective Catalytic Reduction): Using NH3 or urea as a reducing agent, denitrification is carried out under the action of a metal catalyst, which has a high denitrification efficiency, but requires modification of the boiler body.

O3氧化技術(shù):適用于特定情況下的脫硝處理。

O3 oxidation technology: suitable for denitrification treatment in specific situations.

溫度控制:

Temperature control:

生物質(zhì)鍋爐的煙氣中SO3含量較高,在低溫區(qū)域容易發(fā)生硫酸鹽堵塞和腐蝕問題。因此,需要特別注意脫硝設(shè)備的溫度控制,避免在280℃以下的低溫區(qū)使用SNCR技術(shù)。

The SO3 content in the flue gas of biomass boilers is relatively high, and sulfate blockage and corrosion problems are prone to occur in low-temperature areas. Therefore, special attention should be paid to temperature control of denitrification equipment to avoid using SNCR technology in low temperature areas below 280 ℃.

催化劑的選擇與維護(hù):

Selection and maintenance of catalysts:

抗堿金屬脫硝催化劑可以在300~420℃的煙氣中直接進(jìn)行脫硝,但循環(huán)流化床鍋爐由于粉塵含量較高,需要進(jìn)行預(yù)除塵處理。

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Anti alkali metal denitrification catalysts can directly perform denitrification in flue gas at 300-420 ℃, but circulating fluidized bed boilers require pre dust removal treatment due to their high dust content.

定期檢查SCR脫硝系統(tǒng)的催化劑使用狀況,確保其良好穩(wěn)定運(yùn)行。

Regularly inspect the catalyst usage of the SCR denitrification system to ensure its good and stable operation.

還原劑的選擇:

Selection of reducing agent:

根據(jù)實(shí)際情況選擇合適的還原劑,如尿素、氨水等,并根據(jù)具體需求調(diào)整其使用量和噴射位置以提高脫硝效果。

Select appropriate reducing agents such as urea, ammonia water, etc. according to the actual situation, and adjust their usage and injection position according to specific needs to improve denitrification efficiency.

燃料預(yù)處理:

Fuel pretreatment:

對(duì)生物質(zhì)燃料進(jìn)行適當(dāng)?shù)念A(yù)處理,如粉碎、拌入催化劑等,可以提高燃燒效率并減少氮氧化物的生成。

Proper pretreatment of biomass fuels, such as crushing and mixing with catalysts, can improve combustion efficiency and reduce the generation of nitrogen oxides.

綜合考慮其他污染物的治理:

Taking into account the treatment of other pollutants:

生物質(zhì)鍋爐除了NOx外,還會(huì)產(chǎn)生其他污染物如SO2、煙塵等。因此,在實(shí)施脫硝的同時(shí),還需要配備相應(yīng)的除塵、除硫設(shè)施以達(dá)到全面的環(huán)保要求。

In addition to NOx, biomass boilers also produce other pollutants such as SO2 and smoke. Therefore, while implementing denitrification, corresponding dust and sulfur removal facilities need to be equipped to meet comprehensive environmental protection requirements.

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