Internal structure and description of Wuxi chemical waste gas scrubber
Corresponding treatment gas;
For all kinds of corrosive gas purification treatment has obvious effect, can effectively remove the hydrogen chloride gas (HCl), hydrogen fluoride (HF), ammonia (NH3), sulfuric acid mist (H2SO4), chromium acid (CrO3), hydrogen cyanide gas (HCN) and alkali (NaOH), hydrogen sulfide (H2S), Faure Marin (HCHO) and water soluble gas. Our company's independent research and development of high cleaning efficiency, simple operation and long service life. After treatment, the acid and alkali waste gas emissions meet the national emission standards.
The chromium containing waste gas
It is necessary to adopt the method of combination of filtration recovery pretreatment and wet spray treatment. The net recovery device can preliminary recovery of chromic acid mist in exhaust gas 60%-80% chromic acid, considering the discharge standards, the subsequent need to spray with absorption and purification. The highly toxic six valent chromium can be reduced to trivalent chromium with low toxicity:
H2CrO73Na2SO33H2SO4, Cr2 (SO4) 33NaSO44H2O
Nitrogen oxides (NOX)
Nitric acid solution has strong oxidation and instability, and its oxides are various. It is necessary to combine with the reducing agent to produce a stable N2.
2NOO2, 2NO2
2Na2S2O3NO22 NaOH, 2N2 = 4 Na2SO42H2O
Treatment of acid and alkali waste gas
Because of its excellent water solubility and easy to be absorbed by water, this kind of waste gas can be removed by absorption method. Acid gas by alkali absorption, alkaline gas by acid liquid absorption. For example: sulfuric acid waste gas can be used sodium hydroxide solution or ammonia neutralization treatment, ammonia containing waste water can be directly absorbed into ammonia. The reaction is as follows:
H2SO4 +2NaOH + Na2SO4 + 2 H2O
NH3+H2O, NH3, H2O
The treatment of cyanide containing waste gas
There are two methods: adding fog inhibitor or absorbing method. However, due to the use of fog inhibitor, may affect the water quality and the impact of subsequent processes lead to poor plating effect and not much use. Due to a variety of hydrogen cyanide can be absorbed, it is currently the most common approach is the use of wet gas containing cyanogen absorption. Cyanide exhaust available 1.5% sodium hydroxide and sodium hypochlorite solution absorption. The absorption liquid with sodium hypochlorite solution, using sodium hydroxide to adjust the absorption liquid PH in alkaline condition, the absorption by spray tower, the purification efficiency can reach above 90%, the process of generating products are carbon dioxide, nitrogen and sodium chloride. The reaction equation is as follows:
2NaClO + CN- + CO2 + N2 + 2NaCl
The waste gas containing fluorine
Absorption (wet) and adsorption (dry). Adsorption method for physical adsorption, the general adsorbent is not easy to better adsorption of HF, and adsorbent high price, easy to saturation, high operating costs, the shortcomings of the market has been widely used.
Absorption method is the use of alkaline solution as absorbent, through gas-liquid contact, mass transfer reaction to absorb fluoride. To control the clearance of certain conditions, can also generate economic benefits from fluosilicic acid (cryolite). The main principle is based on the solubility of hydrogen fluoride in water, and the two is based on the principle of acid and alkali neutralization. Absorption method has the advantages of small size, stable purification efficiency, low investment and operating costs, commonly used Ca (OH) 2 absorption HF.
2HF+ Ca (OH) 2, CaF2H2O
Spray type packing Qingdao San Da environmental equipment Co. Ltd. design and production of purification tower, gas purification technology is widely used in various fields of chemical, electronics, metallurgy, industrial production, main harmful gas treatment for sulfuric acid mist, fog, mist, hydrochloric acid chromium nitrate phosphate mist, fog, fog, hydrogen chloride, fluoride and hydrofluoric acid hydrogen sulfide and hydrogen cyanide, etc.. The utility model has the advantages of using the filler and gas-liquid exchange tray for gas-liquid exchange, to achieve the purpose of cleaning waste gas.
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