CN113694840A - Fluidizing device for solid particles and method for fluidizing solid particles - Google Patents
Fluidizing device for solid particles and method for fluidizing solid particles Download PDFInfo
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- 239000007787 solid Substances 0.000 title claims abstract description 93
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- 238000005243 fluidization Methods 0.000 claims abstract description 95
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
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- 238000007254 oxidation reaction Methods 0.000 description 7
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
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- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- -1 phthalic acid ester Chemical class 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1818—Feeding of the fluidising gas
Abstract
The invention relates to the technical field of fluidization, and discloses a fluidization device and a fluidization method for solid particles, wherein the fluidization device (10) for the solid particles comprises: the fluidization device comprises a fluidization cavity (12) and an air inlet mechanism (14), wherein a fluidization cavity (120) is arranged in the fluidization cavity (12), and a feeding hole for feeding solid particles to be fluidized into the fluidization cavity (120), a discharging hole for discharging the fluidized solid particles, an air inlet for feeding fluidizing air for fluidizing the solid particles and an air outlet for discharging the fluidizing air are formed in the fluidization cavity (12); the air inlet mechanism (14) is communicated with the air inlet, and the air inlet mechanism (14) is arranged to be capable of introducing fluidizing air capable of forming a pulsating flow into the air inlet. The fluidization device for solid particles can improve fluidization effect and fluidization efficiency.
Description
Technical Field
The invention relates to the technical field of fluidization, in particular to a fluidization device for solid particles and a fluidization method for the solid particles.
Background
The granular material is piled in the fluidized bed, and when gas is introduced from the lower part of the fluidized bed, solid particles are suspended in the fluidized bed and are brought into a boiling state along with the increase of the gas velocity to a certain degree. The solid particle fluidization technology is well applied to the technical processes of oil refining, chemical engineering, metallurgy and the like, and higher efficiency and huge economic benefit are obtained.
Taking the indirect coal liquefaction technology as an example, before the fischer-tropsch synthesis reaction, an oxidation state catalyst such as iron-based/cobalt-based catalyst particles needs to be reduced by using a fluidized bed. When the catalyst particles are subjected to reduction treatment by using a solid particle fluidization technology, gas-solid contact is one of important factors influencing the reduction effect.
At present, the modes of strengthening gas-solid contact are various, such as reasonably arranging a distributor in a fluidized bed or adding a back mixing baffle and the like; however, in the fluidization process, channeling, air lock, local dead bed, defluidization and the like are easily formed, and the fluidization effect and the fluidization efficiency are greatly influenced.
Disclosure of Invention
The invention aims to overcome the problems of low fluidization effect and low fluidization efficiency in the prior art, and provides a fluidization device for solid particles, which can improve the fluidization effect and the fluidization efficiency.
In order to achieve the above object, an aspect of the present invention provides a fluidizing apparatus for solid particles, comprising:
the fluidization cavity is internally provided with a fluidization chamber, and the fluidization cavity is provided with a feed inlet through which solid particles to be fluidized enter the fluidization chamber, a discharge outlet through which the fluidized solid particles are discharged, an air inlet through which fluidizing gas for fluidizing the solid particles enters and an air outlet through which the fluidizing gas is discharged; and
the air inlet mechanism is communicated with the air inlet and is arranged to introduce fluidizing air capable of forming pulsating flow into the air inlet.
Above-mentioned technical scheme, through setting up the mechanism of admitting air to can make the fluidization gas that lets in to the fluidization chamber form into the pulsating flow, like this, the bed that is formed by the solid particle of treating fluidization redistributes under the effect of pulsating flow that constantly collapses, make the solid particle of treating fluidization distribute more evenly from this, reduced and appeared bias flow or channeling phenomenon, make the solid particle of treating fluidization can contact well with the fluidization gas, not only improved the fluidization effect, and improved fluidization efficiency, in addition, still greatly reduced the radial dimension of bubble, for example reducible 20-40%.
Preferably, the air intake mechanism comprises a first air intake assembly, the first air intake assembly comprises a first pipeline capable of introducing the fluidizing air into the air inlet and a first control valve arranged on the first pipeline, the air intake mechanism comprises a controller connected with the first control valve, and the controller is arranged to adjust the opening degree of the first control valve so that the fluidizing air is formed into a pulsating flow.
Preferably, the air inlet mechanism comprises a second air inlet assembly, the second air inlet assembly comprises a second pipeline connected with the first pipeline in parallel and a second control valve arranged on the second pipeline, and the second control valve can enable the fluidizing air in the second pipeline to keep a stable flow;
the air inlet mechanism comprises a collecting pipe arranged at the air inlet, and the first end of the first pipeline and the first end of the second pipeline are both connected to the collecting pipe.
Preferably, the first air intake assembly comprises a first flow meter disposed on the first conduit; and/or the presence of a gas in the gas,
the second intake assembly includes a second flow meter disposed on the second conduit.
Preferably, the fluidization device for solid particles comprises a gas distributor arranged within the fluidization chamber; one end of the collecting pipe is communicated with the gas distributor.
Preferably, the fluidizing device for solid particles comprises a plurality of gas distributors arranged at intervals along the height direction of the fluidizing cavity, and a plurality of gas inlets respectively corresponding to the gas distributors are arranged on the fluidizing cavity;
the fluidizing device for solid particles comprises a plurality of gas inlet mechanisms which are respectively communicated with the gas distributors through the corresponding gas inlets.
In a second aspect, the present invention provides a method of fluidising solid particles, the method comprising:
step S10: causing the fluidizing gas to form a pulsating flow;
step S20: the fluidizing gas obtained in step S10 is introduced into the solid particles to be fluidized to fluidize the solid particles.
By introducing fluidizing gas formed into pulsating flow into the solid particles to be fluidized, the bed layer formed by the solid particles to be fluidized is continuously collapsed and redistributed under the action of the pulsating flow, so that the solid particles to be fluidized are more uniformly distributed, the phenomena of bias flow or channeling are reduced, the solid particles to be fluidized can be well contacted with the fluidizing gas, the fluidizing effect is improved, the fluidizing efficiency is improved, and in addition, the radial size of bubbles is greatly reduced, for example, the radial size can be reduced by 20-40%.
Preferably, the step S10 includes:
step S10 a: separating the desired fluidization gas into a first portion of fluidization gas and a second portion of fluidization gas;
step S10 b: the first part of the fluidizing gas is formed as a pulsating flow and the second part of the fluidizing gas is formed as a steady gas flow, after which the first part of the fluidizing gas and the second part of the fluidizing gas are mixed as the fluidizing gas required in said step S20.
Preferably, the method for fluidizing solid particles comprises:
step S12: in the direction along the flow of the solid particles, a plurality of groups of the fluidizing gas forming the pulsating flow obtained in the step S10 are respectively introduced.
Preferably, in the step S12, the sum of the flow rates of the multiple sets of fluidizing gas forming the pulsating flow is the same in unit time.
Drawings
FIG. 1 is a schematic view showing an application structure of a fluidizing apparatus for solid particles according to a preferred embodiment of the present invention;
figure 2 is a schematic view of a preferred flow regime of the fluidizing gas introduced into the fluidizing chamber.
Description of the reference numerals
10-fluidizing means for solid particles; 12-a fluidization chamber; 120-a fluidization chamber; 14-an air intake mechanism; 140 a-a first conduit; 140 b-a second conduit; 142 a-a first control valve; 142 b-a second control valve; 144 a-first flow meter; 144 b-a second flow meter; 16-a gas distributor; 18 a-a manifold; 18 b-main trachea; 20-a heat exchanger; 22-a compressor; 24-an oil-water separator; 26-oil washing tank.
Detailed Description
In the present invention, the use of directional terms such as "upper, lower, left and right" in the absence of a contrary explanation generally means that the directions shown in the drawings and the practical application are considered to be the same, and "inner and outer" mean the inner and outer of the outline of the component.
The invention provides a fluidizing device for solid particles, the fluidizing device 10 for solid particles comprises a fluidizing cavity 12, a fluidizing chamber 120 is arranged in the fluidizing cavity 12, a feeding hole for feeding the solid particles to be fluidized into the fluidizing chamber 120, a discharging hole for discharging the fluidized solid particles, a gas inlet for feeding the fluidizing gas for fluidizing the solid particles and a gas outlet for discharging the fluidizing gas are arranged on the fluidizing cavity 12, wherein the gas inlet is preferably arranged below the gas outlet, for example, the gas inlet can be arranged at the bottom of the fluidizing cavity 12, the gas outlet can be arranged at the top of the fluidizing cavity 12, the fluidizing gas fed from the gas inlet can suspend the solid particles in the fluidizing chamber 120 to form a bed layer, in addition, the fluidizing cavity 12 is provided with a feeding hole, for example, the feeding hole can be arranged between the gas inlet and the gas outlet, the discharge port is arranged at the bottom of the fluidization cavity 12; the fluidising apparatus 10 for solid particles further comprises an air inlet means 14, the air inlet means 14 being in communication with the air inlet and the air inlet means 14 being arranged to enable the introduction of a fluidising gas capable of forming a pulsating flow into the air inlet. By arranging the air inlet mechanism 14, the fluidizing gas introduced into the fluidizing chamber 120 can be formed into pulsating flow, so that a bed layer formed by the solid particles to be fluidized is continuously collapsed and redistributed under the action of the pulsating flow, the distribution of the solid particles to be fluidized is more uniform, the phenomena of bias flow or channeling are reduced, the solid particles to be fluidized can be well contacted with the fluidizing gas, the fluidizing effect is improved, the fluidizing efficiency is improved, and in addition, the radial size of bubbles is greatly reduced, for example, the radial size can be reduced by 20-40%. The fluidizing gas forming the pulsating flow is periodically fluctuating fluidizing gas, and it can be understood that, in each period, the flow rate of the fluidizing gas forms the same curve with fluctuation, wherein the curve of the flow rate of the fluidizing gas in one period may be two straight lines (as shown by curve 2 in fig. 2) which are different in height and are parallel to each other, a triangle or a sine and cosine curve.
It should be noted that the fluidizing device 10 for solid particles can be used for activating a solid particle catalyst such as a fischer-tropsch catalyst, regenerating, reducing, passivating, aging, stripping, etc., and can also be used for processing precious ore; meanwhile, the method can also be used for drying and baking grains and medicinal materials, baking precious metal ore sand and the like. In addition, it can also be used in gas phase processing process using solid particles as catalyst, such as benzene oxidation to prepare phthalic acid ester, butylene oxidation dehydrogenation to prepare butadiene, and propylene oxidation to prepare acrylonitrile.
As shown in fig. 1, the air intake mechanism 14 may include a first air intake assembly, which may include a first pipe 140a configured to introduce the fluidizing air into the air intake port and a first control valve 142a disposed on the first pipe 140a, and the air intake mechanism 14 may include a controller connected to the first control valve 142a, the controller being configured to adjust an opening degree of the first control valve 142a such that the fluidizing air is formed into a pulsating flow.
In addition, the air intake mechanism 14 may include a second air intake assembly, which may include a second pipe 140b connected in parallel with the first pipe 140a and a second control valve 142b disposed on the second pipe 140b, the second control valve 142b being capable of maintaining a stable flow rate of the fluidizing gas in the second pipe 140b, as shown by curve 1 in fig. 2, the opening degree of the second control valve 142b may be fixed so that the flow rate of the fluidizing gas in the second pipe 140b is maintained, and the second control valve 142b may be connected to the controller, which is configured to control the opening degree of the second control valve 142b, for convenience of operation and control; the air inlet mechanism 14 may include a manifold 18a disposed at the air inlet, and the first ends of the first and second tubes 140a, 140b may be connected to the manifold 18 a. it will be appreciated that fluidizing gas passing through the first tube 140a and the second tube 140b may be combined in the manifold 18a to form a pulsating flow of fluidizing gas, which is ultimately directed into the fluidizing chamber 120 from the manifold 18 a. The second air inlet assembly is arranged to provide stable air flow, so that the fluidization effect and the fluidization efficiency can be further improved, and in addition, when the first assembly fails, the second assembly can still ensure the fluidization process.
As shown in fig. 1, a first flow meter 144a may be provided on the first pipe 140a, and the first flow meter 144a may monitor the amount of gas flow in the first pipe 140a, and preferably, the first flow meter 144a may be connected to the controller, which is capable of controlling the opening degree of the first control valve 142a according to the amount of gas flow monitored by the first flow meter 144a, thereby improving the accuracy of the pulsating flow of the fluidizing gas.
In addition, a second flow meter 144b may be provided on the second pipe 140b, and the second flow meter 144b may monitor the amount of gas flow in the second pipe 140b, and preferably, the second flow meter 144b may be connected to the controller, and the controller may control the opening degree of the second control valve 142b according to the amount of gas flow monitored by the second flow meter 144b, so that the stability of the amount of gas flow in the second pipe 140b is improved, and thus, the accuracy of the pulsating flow of the fluidizing gas is further improved.
As shown in fig. 1, a gas distributor 16 may be disposed in the fluidizing chamber 120, and one end of the collecting pipe 18a is connected to the gas distributor 16, and it is understood that one end of the collecting pipe 18a is connected to the gas distributor 16, and one end of the collecting pipe 18a is connected to the first end of the first pipe 140a and the first end of the second pipe 140b, so that the gas distributor 16 may uniformly distribute the fluidizing gas forming the pulsating flow in the fluidizing chamber 120, further improving the fluidizing effect and the fluidizing efficiency. It is further noted that the air inlet mechanism 14 may include a main air pipe 18b, and the second end of the first pipe 140a and the second end of the second pipe 140b may be commonly connected to the main air pipe 18b, whereby it is understood that the air entering the main air pipe 18b is divided into two portions, one portion entering the first pipe 140a to form the steady flow of fluidizing air, and the other portion entering the second pipe 140b to form the pulsating flow of fluidizing air, with the two portions being mixed in the manifold 18 a.
In order to further improve the uniformity of the distribution of the fluidization gas, a plurality of, for example, two gas distributions 16 may be disposed in the fluidization chamber 120, the plurality of gas distributions 16 may be disposed at intervals along the height direction of the fluidization chamber 12, and in addition, a plurality of the gas inlets corresponding to the respective gas distributors 16 may be disposed on the fluidization chamber 12; the fluidizing device 10 for solid particles may comprise a plurality of gas inlet means 14 communicating with respective gas distributors 16 through respective said gas inlets, and in particular the collection pipe 18a of each gas inlet means 14 may be arranged at respective said gas inlets and communicating with respective gas distributors 16. Wherein the gas distributor 16 may be disposed at the bottom of the fluidization chamber 120.
When two gas distributors 16 are provided, the sum of the gas flow amount into one of the gas distributors 16 and the gas flow amount into the other gas distributor 16 is the same per unit time.
Taking the reduction treatment of an oxidized catalyst, such as iron-based/cobalt-based catalyst particles, as shown in fig. 1, the catalyst particles are introduced into the fluidizing chamber 120 through a feed tank; the gas inlet mechanism 14 introduces fluidizing gas which forms a pulsating flow into the fluidizing chamber 120, the fluidizing gas is synthesis gas, the catalyst particles are suspended under the action of the fluidizing gas and undergo a reduction reaction, it should be noted that the fluidizing chamber 120 is heated by a steam pocket to promote the reduction reaction, and the reacted fluidizing gas is discharged from a gas outlet; the gas enters an oil-water separator 24 to separate light oil and synthetic water to form purified gas, the purified gas is pumped into the heat exchanger 20 as fluidizing gas by a compressor 22 again to exchange heat with the reacted fluidizing gas, and then is introduced into the gas inlet mechanism 14 by the heat exchanger 20.
The present invention also provides a method for fluidizing solid particles, preferably using the fluidizing device 10 for solid particles shown in fig. 1, the method for fluidizing solid particles comprising: step S10: causing the fluidizing gas to form a pulsating flow; step S20: the fluidizing gas obtained in step S10 is introduced into the solid particles to be fluidized to fluidize the solid particles. By introducing fluidizing gas formed into pulsating flow into the solid particles to be fluidized, the bed layer formed by the solid particles to be fluidized is continuously collapsed and redistributed under the action of the pulsating flow, so that the solid particles to be fluidized are more uniformly distributed, the phenomena of bias flow or channeling are reduced, the solid particles to be fluidized can be well contacted with the fluidizing gas, the fluidizing effect is improved, the fluidizing efficiency is improved, and in addition, the radial size of bubbles is greatly reduced, for example, the radial size can be reduced by 20-40%. The fluidizing gas forming the pulsating flow is periodically fluctuating fluidizing gas, and it is understood that in each period, the flow rate of the fluidizing gas forms the same curve with fluctuation, wherein the curve of the flow rate of the fluidizing gas in one period may be two straight lines with different heights and parallel to each other (as shown by curve 2 in fig. 2), and may also be triangular or sine-cosine curve. When the curves are two straight lines which are different in height and parallel to each other, the duration time of the airflow with the higher flow rate is 30-60 min, and the duration time of the airflow with the lower flow rate is 0.5-5 min.
It should be noted that the fluidization method of the solid particles can be used for activating the solid particle catalyst such as a Fischer-Tropsch catalyst, regenerating, reducing, passivating, aging, stripping and the like of the solid particle catalyst, and can also be used for processing and treating valuable ore sand; meanwhile, the method can also be used for drying and baking grains and medicinal materials, baking precious metal ore sand and the like. In addition, it can also be used in gas phase processing process using solid particles as catalyst, such as benzene oxidation to prepare phthalic acid ester, butylene oxidation dehydrogenation to prepare butadiene, and propylene oxidation to prepare acrylonitrile.
In order to further improve the fluidization effect and the fluidization efficiency, the step S10 may include: step S10 a: separating the desired fluidization gas into a first portion of fluidization gas and a second portion of fluidization gas; step S10 b: the first part of the fluidizing gas is formed as a pulsating flow and the second part of the fluidizing gas is formed as a steady gas flow, after which the first part of the fluidizing gas and the second part of the fluidizing gas are mixed as the fluidizing gas required in said step S20. It will be appreciated that the first portion of the fluidising gas may be introduced through the first gas inlet assembly and the second portion of the fluidising gas may be introduced through the second gas inlet assembly, both being combined in the manifold 18a before being passed into the solid particles to be fluidised.
The fluidization method of the solid particles comprises the following steps: step S12: in the direction along the flow of the solid particles, a plurality of sets of the fluidizing gas forming the pulsating flow obtained in the step S10, for example, two sets of the fluidizing gas forming the pulsating flow obtained in the step S10, may be introduced into the solid particles to be fluidized, whereby the fluidizing effect and the fluidizing efficiency may be further improved. It will be understood that the two sets of fluidizing gas forming pulsating flows obtained in step S10 are introduced in the height direction of the fluidizing chamber 12.
In addition, the fluidizing gas introduced into the solid particles to be fluidized can be uniformly distributed, for example, by the gas distributor 16. Thus, gas and solid can be fully contacted, thereby improving the fluidization efficiency and the fluidization effect.
In step S12, the sum of the flow rates of the plurality of groups of fluidizing gas forming the pulsating flow is the same per unit time. Taking two groups as an example, the two groups of fluidizing gases are pulsating flows with periodic fluctuation, when the flow curves in one period are formed into two straight lines with different heights and parallel to each other, when the gas flow of one group of fluidizing gases reaches the periodic maximum value, the gas flow of the other group of fluidizing gases reaches the periodic minimum value.
When the first set of fluidization gas is located below the second set of fluidization gas, the total amount of introduction of the first set of fluidization gas is 40% -80% of the total amount of fluidization gas required, and in addition, the gas flow rate of the first portion of fluidization gas in each set of fluidization gas is 10-30% of the amount of introduction of the set of fluidization gas.
The effects of the present invention will be further illustrated by examples.
Examples
Example 1
An iron-based catalyst (main component is Fe) was fluidized by a fluidizing device 10 for solid particles shown in FIG. 12O3) And (3) carrying out fluidization, wherein the diameter of the fluidization cavity 12 is 400mm, two gas distributors 16 are arranged, two groups of gas inlet mechanisms 14 are correspondingly arranged, the first group of gas inlet mechanisms are positioned below the second group of gas inlet mechanisms, and simultaneously, fluidizing gas is introduced into the two groups of gas inlet mechanisms 14, is air, and is operated at normal temperature and normal pressure.
The maximum value of the total flow of fluidizing gas of the first group of inlet means is 160Nm3H duration 120s, minimum value of total flow 140Nm3H, duration 10 s. In particular, a first fluidization gas is introduced into the first conduit 140a, the maximum flow rate of the first fluidization gas being 40Nm3Flow rate of 20Nm at a minimum3H, simultaneously to the second pipe 140b, introducing second fluidizing gas with stable flow rate, wherein the flow rate of the second fluidizing gas is 120Nm3And the opening degree of the first control valve 142a is controlled by the controller so that the flow rate of the first part of the fluidizing gas is formed into two straight lines with different heights and parallel to each other in one period, and the two straight lines are finally introduced into the fluidizing chamber 120 through the collecting pipe 18a, wherein the flow rate of the first part of the fluidizing gas is 30% of the total amount of the fluidizing gas introduced into the set of gas inlet mechanisms 14, and the total amount of the set of fluidizing gas is 60% of the total amount of the required fluidizing gas;
the maximum value of the total flow of the fluidizing gas of the second group of inlet means is 50Nm3H duration 10s, minimum value of total flow 30Nm3H, duration 120 s. In particular, the first line 140a is fed with a first fluidization gas having a flow rate of at most 30Nm3H, minimum flow of 10Nm3H, simultaneously introducing second fluidizing gas with stable flow into the second pipeline 140b, wherein the flow of the second fluidizing gas is 20Nm3And the opening degree of the first control valve 142a is controlled by the controller so that the flow rate of the first part of the fluidizing gas is formed into two straight lines with different heights and parallel to each other in one period, and is finally introduced into the fluidizing chamber 120 through the collecting pipe 18a, wherein the flow rate of the first part of the fluidizing gas is 20% of the total amount of the fluidizing gas introduced into the set of gas inlet means 14.
The sum of the flow rates of the fluidizing gas introduced by the first group of gas inlet means and the fluidizing gas introduced by the second group of gas inlet means is the same in unit time.
During fluidization, a significant reduction in drift and channeling was observed, with a 40% reduction in average bubble diameter.
Example 2
Fluidized device 10 for iron-based catalyst (main component is Fe) using solid particles2O3) And (3) carrying out fluidization, wherein the diameter of the fluidization cavity 12 is 70mm, only one gas distributor 16 is arranged, the fluidization gas is air, the operation temperature during fluidization is 220-280 ℃, and the operation pressure is 1.5 MPa.
The first pipeline 140a is introduced with first fluidizing gas, and the second pipeline 140b is introduced with second flow with stable flowThe fluidization air (as shown by curve 1 in fig. 2), and the opening degree of the first control valve 142a is controlled by the controller such that the flow rate of the first fluidization air is formed as two straight lines (as shown by curve 2 in fig. 2) with different heights and parallel to each other, and the maximum flow rate is 30Nm3H duration 120s, minimum flow 10Nm3And/h for a duration of 10s, and is finally introduced into the fluidizing chamber 120 by the collecting duct 18a, wherein the gas flow rate of the first part of the fluidizing gas is 15% of the total amount of the inflowing fluidizing gas.
During fluidization, a significant reduction in the phenomena of drift and channeling was observed, with a 30% reduction in the average bubble diameter.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A fluidising apparatus for solid particles, characterised in that the fluidising apparatus (10) for solid particles comprises:
the fluidization device comprises a fluidization cavity (12), wherein a fluidization chamber (120) is arranged in the fluidization cavity (12), and a feeding hole for feeding solid particles to be fluidized into the fluidization chamber (120), a discharging hole for discharging the fluidized solid particles, an air inlet for feeding fluidizing gas for fluidizing the solid particles and an air outlet for discharging the fluidizing gas are formed in the fluidization cavity (12); and
an air inlet mechanism (14), wherein the air inlet mechanism (14) is communicated with the air inlet, and the air inlet mechanism (14) is arranged to be capable of introducing fluidizing air capable of forming a pulsating flow into the air inlet.
2. A fluidising apparatus as claimed in claim 1 in which the air inlet means (14) comprises a first air inlet assembly including a first conduit (140a) capable of introducing fluidising air into the air inlet and a first control valve (142a) provided in the first conduit (140a), the air inlet means (14) comprising a controller connected to the first control valve (142a), the controller being arranged to adjust the opening of the first control valve (142a) to cause the fluidising air to form a pulsating flow.
3. The fluidization device for solid particles according to claim 2, wherein said air intake means (14) comprises a second air intake assembly comprising a second pipe (140b) connected in parallel with said first pipe (140a) and a second control valve (142b) disposed on said second pipe (140b), said second control valve (142b) being capable of maintaining a steady flow of fluidization air in said second pipe (140 b);
the air intake mechanism (14) includes a manifold (18a) disposed at the air intake, and the first end of the first tube (140a) and the first end of the second tube (140b) are both connected to the manifold (18 a).
4. The fluidization device for solid particles according to claim 3, wherein said first gas intake assembly comprises a first flow meter (144a) disposed on said first pipe (140 a); and/or the presence of a gas in the gas,
the second intake assembly includes a second flow meter (144b) disposed on the second conduit (140 b).
5. A fluidising device for solid particles as claimed in claim 3 or 4 in which the fluidising device (10) for solid particles comprises a gas distributor (16) disposed within the fluidising chamber (120); one end of the collecting pipe (18a) is communicated with the gas distributor (16).
6. The fluidizing device for solid particles according to claim 5, wherein said fluidizing device (10) for solid particles comprises a plurality of said gas distributors (16) arranged at intervals along the height direction of said fluidizing chamber (12), and a plurality of said gas inlets respectively corresponding to said gas distributors (16) are arranged on said fluidizing chamber (12);
the fluidizing device (10) for solid particles comprises a plurality of said gas inlet means (14) communicating with respective said gas distributors (16) through respective said gas inlets, respectively.
7. A method of fluidizing solid particles, comprising:
step S10: causing the fluidizing gas to form a pulsating flow;
step S20: the fluidizing gas obtained in step S10 is introduced into the solid particles to be fluidized to fluidize the solid particles.
8. The method for fluidizing solid particles according to claim 7, wherein said step S10 includes:
step S10 a: separating the desired fluidization gas into a first portion of fluidization gas and a second portion of fluidization gas;
step S10 b: the first part of the fluidizing gas is formed as a pulsating flow and the second part of the fluidizing gas is formed as a steady gas flow, after which the first part of the fluidizing gas and the second part of the fluidizing gas are mixed as the fluidizing gas required in said step S20.
9. A method of fluidising solid particles as claimed in claim 8 which comprises:
step S12: in the direction along the flow of the solid particles, a plurality of groups of the fluidizing gas forming the pulsating flow obtained in the step S10 are respectively introduced.
10. A method for fluidizing solid particles according to claim 9, wherein in said step S12, the sum of the flow rates of a plurality of sets of fluidizing gas forming a pulsating flow is the same in unit time.
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| CN202010436409.3A CN113694840A (en) | 2020-05-21 | 2020-05-21 | Fluidizing device for solid particles and method for fluidizing solid particles |
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| CN202010436409.3A CN113694840A (en) | 2020-05-21 | 2020-05-21 | Fluidizing device for solid particles and method for fluidizing solid particles |
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| CN111054272A (en) * | 2018-10-17 | 2020-04-24 | 中国石油化工股份有限公司 | Fluidized bed gasification reaction apparatus and method |
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| US4939850A (en) * | 1989-03-29 | 1990-07-10 | Atlantic Richfield Company | Method and apparatus to conduct fluidization of cohesive solids by pulsating vapor flow |
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Application publication date: 20211126 |