Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1985-05-28
1991-03-19
Russel, Jeffrey Edwin
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423247, B01D 5336
Patent
active
050009303
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the purification of combustion gases from, for example, domestic heating installations, internal combustion engines or similar combustion installations, by removal of sulfur dioxide, sulfur trioxide, nitrogen oxides and carbon monoxide by means of a material which chemically converts and binds the impurities.
It is known that more than half of the fossil fuels required for energy supply are used domestically and in the transport field, so that correspondingly more than half of the emissions discharged from these sources into the atmosphere have their origin in private households and in the transport field, in particular motor vehicle traffic. Air pollution by the large number of private households and motor vehicles, or the prevention of this pollution, is therefore an urgent, hitherto completely unsolved problem, in particular since the methods employed for reducing the emissions of SO.sub.2 and NO.sub.x in large and medium-sized combustion installations, such as, especially, large and medium-sized power stations, cannot be used in the applications concerned here, because of the required equipment and operating materials. Furthermore, the major part of the carbon monoxide impurities which are regarded as particularly toxic are emitted by the said small combustion installations, in particular by the about 30 million motor vehicles registered in the Federal Republic of Germany.
According to the available statistics, it can be assumed that the air pollution to be taken into account is caused to the extent of about 35% by industrial combustion installations, to the extent of about 25% by domestic heating installations and to the extent of about 40% by motor vehicle traffic, the proportion of motor vehicle traffic in the total emission being approximately as follows:
______________________________________ Emission by
Total emission
motor vehicles
Proportion
Pollutant
(million tonnes)
(million tonnes)
(%)
______________________________________
CO 35.7 35.0 98.0
C.sub.m H.sub.n
7.7 3.5 45.0
NO.sub.x
7.35 3.15 43.0
SO.sub.x
3.5 0.35 2.5
______________________________________
In conjunction with the global FIGURES given for the proportions of the individual components in the total emission, the above table shows that carbon monoxide can be virtually disregarded in the purification of industrial and domestic waste gases, moreover that the nitrogen oxides, which are particularly difficult to deal with, can be neglected in the purification of the waste gases from domestic heating, whereas the sulfur dioxide impurities, which particularly in recent times have been extensively discussed, must be ascribed in approximately equal parts to the domestic waste gases and the industrial waste gases.
It is the object of the present invention to provide a process for the purification of flue gases, combustion gases and process gases, by means of which process especially the highly polluting sulfur dioxide, sulfur trioxide and carbon monoxide impurities as well as nitrogen oxides can be separated off and which allows economical use not only in large units but also in very small units and thus allows purification of the waste gases, arising in domestic heating installations, motor vehicles and similar small combustion installations, under economical conditions. The invention comprises passing the combustion gas through a bed of high-porosity pellets, which contain metal oxides as the active material and, in the case of the presence of nitrogen oxides, also manganese dioxide (MnO.sub.2), and thus depositing the impurities on the metal oxides.
The invention provides a process, by means of which the impurities contained in the combustion gases are brought with the aid of a special purification material (Moxide) into a form in which bonding to the metal oxides or detoxification of a pollutant is possible, so that overall a very extensive removal of the noxious or toxic gaseous impurities from the combustion gases is achieved in a single process step. Depending on the type of th
REFERENCES:
patent: 3034853 (1962-05-01), Schmidt et al.
patent: 3382033 (1968-05-01), Kitagawa
patent: 3897539 (1975-07-01), Fleming
patent: 3905917 (1975-09-01), Nishino et al.
patent: 4097576 (1978-06-01), Tamura et al.
patent: 4201751 (1980-05-01), Holter et al.
patent: 4230741 (1980-10-01), Yamazaki et al.
patent: 4277556 (1981-07-01), Kobashi et al.
Abstract, German Patent 2,837,175 (Mar. 1, 1979).
LandOfFree
Method and installation for the purification of combustion gas f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and installation for the purification of combustion gas f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and installation for the purification of combustion gas f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2008845