In metallurgy, machinery, chemical industry, electric power and other industries, the exha≥ust gas emitted from various industrial furnaces is not on¥ly with high temperature, but also contains a lot of dust and harmful gases, whic h is one of the main factors causing environmental ↔pollution. Under the condition of high temperature, because the viscosity of exhau®st gas changes greatly, the humidity drops greatly, the ←fine particle condensation phenomenon is greatly reduced, so it is diffic∞ult to separate particles. The bag-type dust remover cannot withstand the high temperature of• the exhaust gas, and the wet de-dusting cannot be utilized comprehensively✘. Electrostatic Precipitator also has a high investment, covers a la₹rge area and insulation problems. At present, high temperature industrial dust-containing w≠aste gas treatment method in our country is mostly through water¥ condensation, makes the high temperature exhaust gas drops to 200℃, then uses the bag ↑duster to remove dust, this not only increases the condensation equipment ☆investment and the operating expense, also causes the massive heat energy loss.
High temperature exhaust gas dust removal has the following characte§ristics:
(1) The required dust gas temperature¶ is high, up to 600~1400℃.
(2) The dust particles in exhaust gas are fine, usual£ly <5~10μm in diameter, even in sub micron scale.
(3) High purification standards, export concentrat♥ion requirements of 10~50mg/m3, or even smaller.
There are nearly 200 thousand industrial kilαns in our country, the annual consumption of coal (coke) is about 200 million tons, and a large amount of high temperature dust and harmful 'gases are emitted in the production process, which seriously pollute the atmospheric envir©onment. The exhaust emissions are characterized with high temperature, high dust concen≤tration, large blackness, and wide variation of temperature, flu¥e gas volume. With the development of economy, environmental protection requirements arαe becoming stricter. Therefore, the new high temperature industrial waste gas dust removal technology is an important issue to be developed urgently.
Since 1970s, the advanced countries in the world have been study♦ing the ceramic membrane filter dust collector with various materials and structures,© which has been used for high temperature filtration and dust removal, and has achieved good ♥results. The main physical properties of ceramic membranes are porosity, permeability and bending ©strength. The results show that compared with other types of dust, dust remo$val efficiency of ceramic membrane filtration dust collecto≠r is high, can reach more than 99.99%, the particles with size more than 5μm can be rem$oved, and has the advantages of simple structure, the most important is the hi₩gh temperature resistance, the working temperature can re↓ach above 800℃, and has good corrosion resistance in oxidation and reduction in a high te≥mperature environment, so the ceramic filter dust collectαor in high temperature dust play an important role.
Based on the filtration performance of ceramic membrane, a variety oσf filtration devices can be developed, and the main§ applications are summarized as follows:
(1) Dust removal device of ceramic filter in coal-fired power plant.$ This is considered to be one of the most credible dust removal technique&s. In view of the strengthening of environmental awarenes∞s, the current electrostatic precipitator usually used in coal-fired power plant€s will be difficult to meet the requirements of environmental l§egislation.
(2) Dust collector for ceramic membrane filter in metallurgical industrλy. In nonferrous metal smelting, the drying of concentr≤ate and leaching slag is widely used in rotary kiln. Drying kiln produces a lot of soot;↑ containing metal particles pollute the environment. Because the temperature of ♣flue gas and its dew point temperature (45~65℃) is very closαe, and it absorbs humidity, it is easy to cause the condensation of flue gas, which brings diffic←ulty to dust collection. The above problems can be s∑olved well by using ceramic membrane filter to collect dust at high temperature.
(3) New clean coal combustion technology - integrated gasification ✘combined cycle power generation (IGCC) route, is a new type of high eff>iciency power generation technology which is invested and develφoped all over the world. It will be practical in twenty-first Century. After the coal gasif®ication reaction tower and the desulfurization device, the high temper ature gas dust is filtered out, and the ceramic membrane filter is the best technical route.•
(4) Industrial gas purification, especially high temperature flue gas and gas chemical industry, including the removal of solid partic les in the industrial process of raw material gas and so&lid particles in the exhaust gas purification, removal, directly re"lated to the service life and operation safety of downstream equipment, these industria>l furnace kiln flue gas in the dust (particles less than 1λ0 µm), will endanger human health. For the ab ove processing requirements, ordinary dust collector i☆s difficult to achieve, but it is the advantage for inorgγanic ceramic membrane filter.
(5) Recover of useful powders, especially high added v±alue dust. For example, in the petrochemical plant fluidized bed equipmeΩnt to recover catalyst, to collect powder in the air transport and spray drying proces✘s, Nano material production and other ultrafine powder produc✔tion in the recovery of powder.
(6) With the improvement of environmental protection requirements, in order to↔ protect human health, such as waste incineration, especially radioactive, infectious and other harmful waste, such as medical and other waste incineration, in order to prevent har×mful dust pollute the atmosphere, the use of high efficiency cerαamic membrane dust removal is a practical method.
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