Two-stage pre-spraying water circulating fluidized bed desulfurization technique and system thereof
A technology of circulating fluidized bed and desulfurization process, applied in chemical instruments and methods, separation of dispersed particles, use of liquid separation agent, etc., can solve the problem of increasing the contact time of gas and solid two-phase reactants, inconvenient installation of small thermal devices, Reactor height lengthening and other issues, to achieve the effect of benefiting circular economy, increasing self-desulfurization rate, reducing investment and transportation
Active Publication Date: 2010-10-06
WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL
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Problems solved by technology
However, the chemical reaction of this desulfurization process is a gas-solid two-phase reaction between dry flue gas and wet particles, and the reaction speed is relatively slow. Correspondingly lengthened, it cannot be conveniently installed on the original small thermal device
At the same time, the NID desulfurization process is also equipped with a special digestion device to digest quicklime into Ca(OH) 2 , which increases the complexity of the system
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[0028] The following is a further detailed description of the present invention in conjunction with the accompanying drawings for the flue gas discharged by a thermal device:
[0029] The two-stage pre-spray water circulating fluidized bed desulfurization system shown in the figure is mainly composed of a first-stage water spray device 2, a first-stage dust collector 3, an induced draft fan 4, and a second-stage water spray device 5, which are connected in sequence through the flue and valves. , circulation reactor 14, secondary dust collector 12, booster fan 11 and chimney 10 and other components. The primary dust collector 3 adopts an electrostatic precipitator, which is used to remove dust particles mixed in the flue gas, and the secondary dust collector 12 adopts a bag filter, which is used to remove product particles after the flue gas desulfurization reaction. The flue gas inlet of the primary dust collector 3 is connected to the smoke exhaust port of the thermal device ...
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Abstract
The invention discloses a desulphurization process with a second-grade pre-sprinkling water circulating fluidized bed and a system thereof. Firstly, the flue gas is carried out a first grade treatments of water spraying, temperature reduction, humidification and a first grade dusting by the process to remove the dust particles of the flue gas, then the flue gas is carried out a second-grade treatments of water spraying, temperature reduction and humidification so as to lead the SO2 and the H2O in the flue gas to react and generate H2SO3,,and then the flue gas is carried out the treatment of circulating fluidized bed desulphurization to lead the H2SO3 and the Ca(OH)2 to react and generate CaSO3 1 / 2H2O, and at last the flue gas is carried out a second grade treatment of dusting to deprive resultant grains of the flue gas and to use the resultant grains for recirculation, and clean flue gas is separated at the same time. The process has the advantages of simple flow, rapid reaction speed, high desulphurization efficiency, which is perfectly suitable for the working conditions of small flue gas flow and low sulphur dioxide content. The system mainly consists of a first grade water spraying device, a first grade dust catcher, a second grade water spraying device, a recirculation reactor and a second grade dust catcher. The system has the advantages of simple structure and low cost,and is easy to integration design and installation with a small coal-fired boiler or other heat device.
Description
technical field [0001] The invention relates to a purification treatment technology for flue gas at the tail of coal-fired boilers or other thermal devices, in particular to a two-stage pre-spraying circulating fluidized bed desulfurization process and its system. Background technique [0002] Sulfur dioxide gas pollution control is one of the key environmental protection issues that the world is concerned about. Sulfur dioxide gas pollution is extremely harmful to my country's ecological environment, and has become a top priority for my country's air pollution control. In the field of sulfur dioxide removal technology, the limestone / gypsum wet washing process is the most widely used in industry. This process has high desulfurization efficiency, but the equipment is relatively complicated, and the investment and operation costs are high. The circulating fluidized bed flue gas desulfurization technology (CFB-FGD) can greatly increase the residence time of the desulfurizer pa...
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IPC IPC(8): B01D53/50B01D53/83B01D53/18B01D47/06
Inventor朱敬韩旭王汉平朱跃李雄浩
OwnerWUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL