Waste gas treatment spray tower, organic waste gas spray absorption purification device standards
The equipment can be equipped with gas on-line analyzer, PH control system, a differential pressure transmitter, pressure sensor, flow sensor, conductivity meter, level control meter, electromagnetic valve, inverter and control cabinet and other components of the above control are in the form of digital display interface, make management personnel at a glance, and fault alarm, convenient management and maintenance.
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. I independently developed washing tower purification efficiency, simple operation management, long service life. The acid and alkali waste gas discharge after purification treatment reaches the national discharge standard.
The chromium containing waste gas
The combination of filtration recovery pretreatment and wet spray depth 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 lower toxic trivalent chromium by sulfurous acid solution:
H2CrO73Na2SO33H2SO4, Cr2 (SO4) 33NaSO44H2O
Nitrogen oxides (NOX)
Nitric acid solution has strong oxidation and instability, its oxide morphology is diverse, purification of its need to combine with the role of reducing agent, its reaction to generate stable N2.
2NOO2, 2NO2
2Na2S2O3NO22 NaOH, 2N2 = 4 Na2SO42H2O
Treatment of acid and alkali waste gas
Because of the excellent water solubility of this kind of waste water, it is easy to be absorbed by water, so the absorption method can achieve good removal effect. 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 to 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 washing performance and the subsequent process leading 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 method (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 shortcomings, rarely been widely used in the market.
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 principle is based on the solubility of hydrogen fluoride in water, two is based on acid-base neutralization principle. Absorption method has the advantages of small purification equipment, stable purification efficiency, low investment and operating costs, commonly used Ca (OH) 2 absorption HF.
2HF+ Ca (OH) 2, CaF2H2