Gas-solid fluidized bed calcination reactor

A fluidized bed and reactor technology, applied in the field of gas-solid fluidized bed calcination reactors, can solve the problems of low reaction efficiency, ineffective use of reactor space, and insufficient utilization of heat, and achieves good mass transfer performance, The effect of high-efficiency thermal decomposition reaction of solid particles and uniform space-time distribution

Active Publication Date: 2019-05-03
YUANCHU TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the defect of this kind of reactor is that there is no gas to transport heat in the descending section, so the reaction efficiency in this section is very low, the reactor space is not effectively used, and the air passes through once, and the heat is not fully utilized

Method used

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Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1: Two-stage internal circulation gas-solid fluidized bed calcining reactor

[0053] The specific structural parameters are as follows: in this embodiment, the guide tube 2 is divided into two guide sections, the reaction section 15 has an inner diameter of 125 mm and a height of 750 mm, and the separation section 16 has an inner diameter of 175 mm and a height of 250 mm; the guide tube 2 has a diameter of 62 mm and is divided into two sections , from top to bottom, the height of the first section is 350mm, and the height of the second section is 280mm. It adopts the method of multi-tube arrangement, the gap between the two tubes is 40mm, the diameter of the lower opening of the guide tube 2 is 80mm, and the taper is 1:2; Bottom 30mm. The main distributor 3 is a sieve disc distributor with a diameter of 80mm; the interstage distributor 4 is a ring distributor with a diameter of 40mm.

[0054] Taking calcium carbonate (average particle diameter 10 microns) as...

Embodiment 2

[0055] Embodiment 2: three sections internal circulating fluidized bed calcining reactor

[0056] The specific structural parameters are as follows: the reaction section 15 has an inner diameter of 125mm and a height of 950mm, the separation section 16 has an inner diameter of 175mm and a height of 220mm; the guide tube 2 has a diameter of 56mm and is divided into 3 sections, the first section is 320mm high, the second section is 280mm high, and the third section is high 260mm, take the way of opening between sections, the total area of ​​openings between the two sections is 16cm2, and the total height occupied by the two sections of openings is 50mm; the diameter of the lower opening of the guide tube 2 is 80mm, and the taper is 1:2. The guide tube 2 is 30mm away from the bottom of the casing. The main distributor 3 is a sieve disc distributor with a diameter of 80mm; the interstage distributor 4 is a ring distributor with a diameter of 35mm.

[0057] Taking calcium carbonat...

Embodiment 3

[0058] Embodiment 3: calcining magnesium chloride monohydrate prepares basic magnesium chloride Mg(OH)Cl

[0059] Adopt the calcination reactor among the embodiment 1, high-temperature gas is hot air, and temperature is 340 ℃, MgCl2.H2O adopts MgCl2.6H2O prepares in advance (the mass fraction of water of crystallization is 19.2%), continuously adds reactor through high-level trough; Reaction The device is operated at normal pressure, and the total gas flow (standard condition) is 1800L / h, of which 70% of the gas is passed through the main distributor 3 at the bottom, and the rest is passed through an interstage distributor 4 . The average bed density in the reactor is 580kg / m3; the feed rate is 8kg / h. When the operation reaches a steady state, the average temperature of the first section of the reactor is 274° C., and the average temperature of the second section is 276° C.; the mass fraction of basic magnesium chloride in the obtained product is 78%.

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Abstract

The invention discloses a gas-solid fluidized-bed roasting reactor. The gas-solid fluidized-bed roasting reactor comprises a shell and a flow guide cylinder arranged in the shell. The shell is provided with a main gas inlet, a gas outlet, a material inlet and a material discharging structure; the main gas inlet is formed in the lower portion of the flow guide cylinder and used for delivering high-temperature gas into the flow guide cylinder, the gas outlet is formed in the upper portion of the shell and used for discharging gas, the material inlet and the material discharging structure are respectively located on the peripheral side of the flow guide cylinder, the material inlet is used for providing to-be-roasted materials, and the material discharging structure is used for collecting and discharging roasting waste. Certain distances exist between the two ends of the flow guide cylinder and the inner wall of the shell, a circulating channel for roasting reacting is formed by the flow guide cylinder and the space between the flow guide cylinder and the inner wall of the shell, the powdery to-be-roasted materials enter the shell from the material inlet, and the high-temperature gas enters the flow guide cylinder from the main gas inlet and drives the to-be-roasted materials to be subjected to circulating roasting reacting in the circulating channel. By means of the reactor, macroscopic orientated flowing and microcosmic intense turbulence of solid particles are achieved.

Description

technical field [0001] The present invention relates to the technical field of fluidized bed calcination equipment, more specifically, to a gas-solid fluidized bed calcination reactor. Background technique [0002] The calcination process is widely used in the thermal decomposition of solids, crystal transformation and other processes. In recent years, the gas-solid fluidized bed calcination device has gradually replaced the traditional static calcination furnace due to the advantages of sufficient gas-solid contact, high gas-solid heat transfer efficiency, and uniform heating, and has been widely used in the chemical industry and mining industry. [0003] At present, the fluidized bed calcination devices used in industry mainly include ordinary fluidized bed, multi-layer or multi-chamber fluidized bed and circulating fluidized bed. A common fluidized bed is a single-layer or single-chamber fluidized bed, in which solids are thermally decomposed by gas heating in a fluidize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/24
CPCB01J8/0025B01J8/008B01J8/1854B01J8/24B01J2208/00769
Inventor 蒋国强丁富新王麒于常军丁海川
Owner YUANCHU TECH (BEIJING) CO LTD
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