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Dried type outside and inside dual circulation fluidized bed desulfurizing device and desulfurizing method thereof

A double-circulation, fluidized bed technology, applied in the field of flue gas purification, can solve the problems of complex system investment and increased operating costs, reduce the adjustment range of working parameters of the device, and blockage of the slurry pipeline, so as to improve the desulfurization effect and occupy The effect of small area and simple structure

Inactive Publication Date: 2007-10-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this device, all the materials in the external separator are returned to the reactor, and the external circulation volume cannot be regulated, which reduces the adjustment range of the working parameters of the device and reduces the adaptability of the external device.
In addition, the device adopts slurry feed, and compared with CFB and RCFB, there are more lime pulping systems, the system is complex and the investment and operation costs are increased, and the slurry pipeline is prone to blockage

Method used

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  • Dried type outside and inside dual circulation fluidized bed desulfurizing device and desulfurizing method thereof
  • Dried type outside and inside dual circulation fluidized bed desulfurizing device and desulfurizing method thereof

Examples

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Effect test

Embodiment 1

[0044] Make a device of the present invention with reference to accompanying drawing 1, this device comprises internal circulating fluidized bed reaction tower 1, and this tower is cylindrical, height and diameter ratio 2-50, and mechanical valve 6 can also adopt screw feeder; Dust removal The device 13 can be a bag filter or an electrostatic precipitator. For example, SWB type, GP type electrostatic precipitator, or LCM type pulse bag type dust collector, LFSF reverse blowing bag type dust collector, etc. can be selected according to the requirements of flue gas properties, flow rate and dust removal effect. There is a flue gas inlet 2 at the bottom 1 of the circulating fluidized bed reaction tower, and a venturi section 7 of the reaction tower is set above the flue gas inlet 2, where a desulfurizing agent nozzle 3 (or replaced by a screw feeder), water spray nozzle 4 and air nozzle 8, and they are respectively communicated with desulfurization agent supply source, water pipe...

Embodiment 2

[0048] The device in this embodiment application embodiment 1 has a flow rate of 50,000 m 3 / h, SO 2 The concentration is 2000mg / M 3 flue gas treatment.

[0049] First press the SO of the flue gas 2 The concentration is 2000mg / M 3 Calculate the amount of powdered desulfurization agent added, according to the amount of powdered desulfurizer added and SO in the flue gas 2 If the Ca / S molar ratio reaches 1.3, powdery desulfurizers such as lime, carbide slag or steel slag need to be sprayed, and the amount of desulfurizer added is 113kg / h. By adjusting the amount of water spray and air, the flue gas temperature in the reaction tower is kept at about 80°C, and the flow rate of water spray and air is 7m / s; through this process, a desulfurization rate of 90% can be obtained, so that SO in the flue gas 2 Concentration reduced to 200mg / M 3 .

[0050] 1) Make the concentration 2000mg / M 3 Contains SO 2 The flue gas enters the internal circulating fluidized bed reaction tower 1 t...

Embodiment 3

[0054] The device of present embodiment application embodiment 1 is 2000m to the flow rate 3 / h, SO 2 The concentration is 5000mg / M 3 The flue gas is processed, and concrete steps are also with embodiment 1, different conditions are as follows.

[0055] First press the SO of the flue gas 2 The concentration is 5000mg / M 3 Calculate the amount of powdered desulfurizer added, based on the effective Ca in the powdered desulfurizer and the SO in the flue gas 2 If the Ca / S molar ratio reaches 2.0, it is necessary to spray powdered desulfurizers such as steel slag, fly ash, and magnesium oxide, or to mix lime, carbide slag, steel slag, fly ash, and magnesium oxide. Mix in the following proportions, for example: 80 parts of lime, 5 parts of carbide slag, 5 parts of fly ash, and 10 parts of magnesium oxide; or mix in the following proportions: 80 parts of lime, 5 parts of carbide slag, 5 parts of steel slag, and 5 parts of fly ash and 5 parts of magnesium oxide; the general partic...

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Abstract

The invention relates to a dry inner-outer dual cycle fluidized bed desulphurization device and a method. The device comprises a flue gas intake mounted at the bottom of the inner cycle fluidized bed reaction tower, a desulfurizer nozzle, a diector nozzle and an air nozzle mounted at the bottom of inner wall; a cyclone is mounted between passing conduit for connecting the flue gas outlet and the dust collector conduit, the solid outlet of the cyclone is connect to a separating tank, of which the outlet on the top is connected to the inlet of the dust collector via the transport conduit, the cleanout door at the bottom of the dust collector is connected to the ash cellar, and the clear gas outlet of the dust collector is connected to the chimney. The flue gas with SO2 enter from the bottom of the thionizer, at the same time, powdery desulfurizer, air and water are sprayed form the bottom of the thionizer respectively, and they moves upwards together in the thionizer, when the SO2 reacts with desulfurizer to deprive the SO2 in the flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a method and device for flue gas desulfurization in a dry-type internal and external double-circulation fluidized bed. Background technique [0002] Flue gas circulating fluidized bed desulfurization (CFB-FGD) process is a new type of dry desulfurization process developed by Lurgi Company in Germany in the 1980s. This process is based on the principle of circulating fluidized bed. The multiple recirculation of the absorbent prolongs the contact time between the absorbent and the flue gas, greatly improving the utilization rate of the absorbent. It not only has many advantages of the dry desulfurization process, such as simple process, less land occupation, small investment, and comprehensive utilization of by-products, but also can be close to or The desulfurization efficiency of the wet process is achieved, that is, the desulfurization efficiency reaches more than...

Claims

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Application Information

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IPC IPC(8): B01D53/83B01D53/50
Inventor 朱廷钰荆鹏飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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