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Flue gas desulfurization and denitrification and dust removal integrated device and process
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A desulfurization, denitrification and flue gas technology, applied in the field of flue gas purification, can solve the problems of difficult control of flue gas flow, inability to distribute uniformly, low denitration efficiency, etc., and achieves reduction of active surface loss, small footprint, and low operating costs. Effect
Active Publication Date: 2015-06-03
NANJING TECH UNIV +1
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The disadvantage of this invention is that the flue gas flow in a reactor is not easy to control, and part of the flue gas after desulfurization is easy to stick to the reactor wall and directly enter the chimney from the denitrification outlet. This part of the flue gas is not mixed with NH3evenly mixed, resulting in low denitrification efficiency; the NH3 nozzle is divided into upper and lower parts, and under the action of smoke exhaust, NH3 cannot be evenly distributed in the upper part of the denitrification cleanliness Cokebed, resulting in low NO removal rate in flue gas
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Embodiment 1
[0036] In this embodiment, the denitration catalyst is TiO 2 , The average particle size is 20 μm, the material of the inorganic membrane tube is alumina, the average pore size is 2 μm, the outer diameter of the membrane tube is 3 mm, and the desulfurizer is limestone-gypsum.
[0037] When the transmembrane pressure difference increases to 1.5KPa, pulse blowing is performed, the backflush time is 0.1s, and the backflush pressure is 0.1MPa.
[0038] NO in this example X The removal efficiency is 95%, SO 2 The removal efficiency is 90%, and the removal efficiency of alumina inorganic membrane tube to dust can reach 100%.
Embodiment 2
[0040] In this embodiment, the denitration catalyst is CrO x , the average particle size is 200 μm, the material of the inorganic membrane tube is siliconcarbide, the average pore size is 20 μm, the outer diameter of the membrane tube is 100 mm, and the desulfurizing agent is sodiumcarbonate.
[0041] When the transmembrane pressure difference increases to 1.5KPa, pulse blowing is performed, the backflush time is 0.3s, and the backflush pressure is 0.3MPa.
[0042] NO in this example X The removal efficiency is 94%, SO 2 The removal efficiency is 93%, and the removal efficiency of siliconcarbide inorganic membrane tube for dust can reach 100%.
Embodiment 3
[0044] In this embodiment, the denitration catalyst is CrO x , The average particle size is 200 μm, the material of the inorganic membrane tube is zirconia, the average pore size is 20 μm, the outer diameter of the membrane tube is 100 mm, and the desulfurization agent is magnesiumoxide.
[0045] When the transmembrane pressure difference increases to 1.5KPa, pulse blowing is performed, the backflush time is 0.5s, and the backflush pressure is 0.5MPa.
[0046] NO in this example X The removal efficiency is 95%, SO 2 The removal efficiency is 94%, and the dust removal efficiency of the zirconia inorganic membrane tube can reach 100%.
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Abstract
The invention relates to a flue gas desulfurization and denitrification and dust removal integrated device and a flue gas desulfurization and denitrification and dust removal integrated process. The device comprises an ammoniastorage tank, a fluidized bedmembrane reactor, a desulfurizing agent storage tank and a desulfurization reactor, and is characterized in that the operations of desulfurization, denitrification and dust removal are integrated, the operating cost is reduced, and the occupied area of equipment is reduced. The flue gas desulfurization and denitrification and dust removal process comprises the following steps: injecting ammonia into the ammoniastorage tank before the original flue gas enters the fluidized bedmembrane reactor, allowing the ammonia-containing flue gas to enter a gas distributor of the fluidized bedmembrane reactor from the bottom to be contacted with a catalyst, and carrying out redox reaction between NOx and NH3 in the flue gas; allowing the denitrated gas to enter a membrane separator on the upper part of the fluidized bed, wherein the dust and catalyst carried in the gas can be intercepted by the membrane separator; and injecting a desulfurizing agent from the desulfurizing agent storage tank for desulfurizing the gas.
Description
technical field [0001] The invention relates to the field of flue gas purification, in particular to an integrated device and process for flue gas desulfurization, denitrification and dust removal. Background technique [0002] SO in coal flue gas 2 , NO X Environmental pollution such as acid rain and photochemical smog caused by dust and dust has become a serious problem affecting the living environment of human beings. With the improvement of environmental protection requirements in recent years, while controlling SO 2 , NO X and dust emission requirements are more urgent. Compared with the single application of traditional desulfurization, denitrification, and dust removal technologies, combined desulfurization, denitrification, and dust removal technologies have advantages in terms of economy and resource utilization efficiency. Coal-burning pollution in my country is becoming more and more serious. It is important to vigorously develop low-cost, high-efficiency c...
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