CN101310828A - Absorber for reducing wall effect - Google Patents
Absorber for reducing wall effect Download PDFInfo
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- CN101310828A CN101310828A CNA2008100453792A CN200810045379A CN101310828A CN 101310828 A CN101310828 A CN 101310828A CN A2008100453792 A CNA2008100453792 A CN A2008100453792A CN 200810045379 A CN200810045379 A CN 200810045379A CN 101310828 A CN101310828 A CN 101310828A
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Abstract
The invention relates to an absorber, comprising a tower body of the absorber, gas distributors which are arranged at the upper end and the lower end of the tower body and an absorption bed which is arranged between the upper gas distributor and the lower gas distributor, and the absorber is characterized in that a blocking object is fixedly connected at the inner wall of the tower body between the upper gas distributor and the lower gas distributor. As the blocking object is arranged at the inner wall of the tower body of the absorber, the route of the gas flow which is in the vicinity of the wall surface of the absorber is changed and gas in the vicinity of the wall surface is mixed with the gas in a mainstream region for a plurality of times during the flowing process, thus reducing the problem of low utilization rate of an absorbent caused by that the gas in the vicinity of the wall surface penetrates the absorption bed in advance, lowering the cost of a device, improving the efficiency of the device and providing protection for the large-scale development of the device.
Description
Technical field
The present invention relates to transformation adsorbed gas separation and field of purification, relate to a kind of absorber that can reduce wall effect in particular.
Background technology
Transformation absorption (Pressure Swing Adsorption is called for short PSA) technology is meant that characteristic that the difference of aspects such as adsorption capacity on adsorbent of the different component that utilizes in the gaseous mixture, adsorption rate, absorption affinity and adsorbent have different adsorption capacities to absorbed component with the pressure difference finishes gas and separate and the technology that purifies.Because this technology has that technology is simple, scale is flexible, easy to operate, automaticity height, characteristics such as small investment, energy consumption are low, therefore, since the PSA technology is successfully developed, obtained development fast, constantly trended towards maturation and perfect, and be widely used in fields such as chemical industry, metallurgy, environmental protection.
Absorber is that gas separates and the nucleus equipment that purifies, and voidage that exists in the absorber and the distribution in adnexa thereof directly have influence on the recovery utilization rate of unstripped gas to the adsorption separation process important influence, the productive rate of product.In the absorber of having filled adsorbent, near the voidage the absorber inwall is greater than the voidage of middle part.The variation that this voidage distributes in absorber makes that (numerical value studies show that greater than adsorbent bed middle part fluid velocity near the wall fluid velocity, near the absorber wall speed is about 6 times of absorber mid portion speed), therefore cause the near wall region adsorbent bed to penetrate in advance.In order to guarantee certain purification and separating effect, promptly guarantee the purity of product, just must finish adsorption process in advance.Yet this moment, the absorber gas inside did not also arrive the adsorbent bed edge, and this part adsorbent is not fully absorption also, has so just caused adsorbent bed not to be utilized fully, promptly caused the dead space of adsorbent bed to increase.Under the certain situation of device production scale, make that the adsorbent loadings is required greater than reality, the volume of absorber is also corresponding bigger, has increased production cost.Simultaneously, because the material gas quantity that the increase of absorber volume makes absorption be present in absorber inside when finishing increases, cause the utilization rate (rate of recovery) of unstripped gas lower.The variation of voidage is commonly referred to wall effect to the influence of adsorbing separation near this wall.Yet, in present adsorption plant, also do not take any measure to reduce wall effect, thereby make in existing adsorption plant, the utilization rate of adsorbent is low, and the volume of absorber is required greater than reality, has limited the scale and the efficient of adsorption plant to a certain extent.
Summary of the invention
The objective of the invention is to overcome the above-mentioned problems in the prior art, a kind of absorber that reduces wall effect is provided, improving the utilization rate of adsorbent, and then reduce the volume of device, improve the efficient of device, save cost, cut down the consumption of energy.
To achieve these goals, the present invention has adopted following technical proposals: a kind of absorber that reduces wall effect, comprise absorber body of the tower 1, be arranged on the gas distributor 2 and 5 of body of the tower 1 upper and lower part, and the adsorbent bed 4 between upper and lower gas distributor 2 and 5, it is characterized in that the inwall of absorber body of the tower 1 is provided with obstacle 3.
The obstacle 3 of absorber body of the tower 1 inwall setting is at least 1.
But described obstacle 3 helical forms are fixed on the inwall of absorber body of the tower 1, and pitch is preferably 200～500mm; Also can ring-type be fixed on body of the tower 1 inwall, described annular obstacle 3 can be provided with a plurality of, between the annular obstacle 3 at a distance of 200～500mm.
Described obstacle 3 can be random geometry in adsorbent bed 4 axial cross sections, is preferably in rectangle, trapezoidal and corner rounding trapezoidal any one.Described cross section is 5～10 times of adsorbent particle diameter in adsorbent bed 4 axial maximum heights, and radially Breadth Maximum is 2～10 times of adsorbent particle diameter.
Can establish through hole on the obstacle 3 of the present invention, make the adsorbent that is positioned at above the obstacle 3 also can give full play to suction-operated.
Absorber of the present invention can be widely used in pressure swing adsorption air oxygen generation system, pressure swing adsorption air nitrogen gas generating system, many transformation absorption and produce gaseous mixture transformation adsorption separation system such as the pressure swing adsorption system of High Purity Hydrogen, transformation adsorbing and extracting carbon monoxide system, alternating temperature adsorbed gas cleaning system.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is after the inwall of absorber body of the tower is connected one or more obstacles, make near the gas the wall under the effect of obstacle, change airflow direction, enter the adsorbent bed middle part, mix with the adsorbent bed central gas, part through mixed gas enters near the wall once more, thereby make near the average speed of the gas of wall reduce, delay near the time of the gas penetration adsorbent bed of wall, improve the utilization rate of adsorbent near the adsorbent bed of wall.Numerical value studies show that the present invention can effectively reduce near the air velocity the wall, reduces wall effect, improves the utilization rate of adsorbent in the absorber, and then improves the efficient of device, saves cost, cuts down the consumption of energy.
Description of drawings
Fig. 1, Fig. 2 are structural representation of the present invention.
Fig. 3 is that A among Fig. 1 is to view.
Fig. 4 is an obstacle of the present invention at the axial sectional view of adsorbent bed 4.
The specific embodiment
The present invention is described in further detail below in conjunction with the specific embodiment.
Embodiment 1: pressure swing adsorption oxygen making device
Pressure swing adsorption oxygen making device, the diameter of absorber body of the tower 1 are 1m, and the bottom of absorber body of the tower 1 is the raw material gas inlet end, are distributed with gas distributor 5; Top is the outlet side, is distributed with gas distributor 2; For having filled the adsorbent bed 4 of adsorbent, bed height is 1.5m between the upper and lower gas distributor 2 and 5, and the adsorbent particle diameter is 2.0mm; The interior wall circular of absorber body of the tower 1 be fixed with 4 with the suitable obstacle 3 of inwall, obstacle 3 is the trapezoidal of corner rounding in adsorbent bed 4 axial cross sections, the cross section is 20mm in adsorbent bed 4 axial maximum heights, radially Breadth Maximum is 10mm, obstacle 3 is evenly distributed on the internal face of absorber body of the tower 1, and the distance between the obstacle 3 is 200mm.The design airspeed of absorber is 0.15m/s, 4 axial mean air flow speed are 0.24m/s apart from wall 2mm place along adsorbent bed, and 4 axial mean air flow speed are not 0.27m/s apart from absorber wall 2mm place along adsorbent bed during handicapping block material 3, increase obstacle 3 backs and have reduced by 16.7% apart from the mean air flow speed of wall 2mm.Simultaneously, make near the direction of the air-flow of wall change behind the increase obstacle 3, mix, the adsorbent in the device is fully used with the gas at adsorbent bed 4 middle parts.Make wall effect greatly reduce after increasing obstacle 3, improved the product oxygen rate of pressure swing adsorption oxygen making device adsorbent, reduced the specific energy consumption of device, improved the efficient of device.
This novel absorber can be used for all pressure-swing absorption apparatus, thereby reduces the wall effect of device, improves the economic performance of device.
Embodiment 2: transformation absorption nitrogen production by air separation device
The diameter of absorber body of the tower 1 is 0.5m, the height of adsorbent bed 4 is 2.4m, the adsorbent particle diameter is 2.5mm, the inwall of absorber body of the tower 1 is fixed with 11 obstacles 3, spacing between the obstacle 3 is 200mm, obstacle 3 is a rectangle at adsorbent bed 4 axial cross sectional shapes, and the cross section is 20mm at adsorbent bed 4 axial height, and width radially is 5mm.When the air speed of absorber is 0.08m/s, 4 axial mean air flow speed are 0.31m/s apart from wall 1mm place along adsorbent bed, and during not handicapping of absorber inwall block material 3 absorber 4 axial mean flow raties are 0.40m/s apart from wall 1mm place along adsorbent bed, after increasing obstacle 3,4 axial mean flow raties have reduced by 22% apart from wall 1mm place along adsorbent bed.Obstacle 3 makes near the gas the wall radially mix with the gas at adsorbent bed 4 middle parts simultaneously, thereby greatly reduces wall effect, makes the performance indications of nitrogen-making device greatly improve.
Embodiment 3: transformation absorption device for producing hydrogen
The diameter of absorber body of the tower 1 is 1.2m, the height of adsorbent bed 4 is 4m, the adsorbent particle diameter is 2mm, the inwall of absorber body of the tower 1 is fixed with 7 obstacles 3, spacing between the obstacle 3 is 200mm～500mm, obstacle 3 is trapezoidal at adsorbent bed 4 axial cross sectional shapes, and the cross section is 10mm at adsorbent bed 4 axial height, and radially Breadth Maximum is 16mm.When the air speed of absorber is 0.04m/s, apart from wall 1.5mm place adsorbent bed 4 axial mean air flow speed is 0.11m/s, be 0.13m/s apart from wall 1.5mm place adsorbent bed 4 axial mean air flow speed when not adding obstacle 3, absorber body of the tower 1 inwall obstacle 3 backs that are connected have reduced by 15.4% apart from the axial mean air flow speed in wall 1.5mm place.Simultaneously, obstacle 3 makes near the gas the wall mix with the gas at absorber middle part, thereby has prolonged the time of absorption, has improved the utilization rate of adsorbent, has improved the economic performance of device for producing hydrogen.
Embodiment 4: transformation absorption purifying carbon oxide device
The diameter of absorber body of the tower 1 is 1.4m, the height of adsorbent bed 4 is 5m, the adsorbent particle diameter is 2mm, absorber body of the tower 1 spiral inner wall shape is fixed with obstacle 3, obstacle 3 is a rectangle at adsorbent bed 4 axial cross sections, the cross section is 15mm at adsorbent bed 4 axial height, and width radially is 20mm, and pitch is 400mm.When air speed was 0.035m/s, 4 axial mean air flow speed were 0.13m/s apart from wall 1.2mm place along adsorbent bed in the absorber, and were 0.158m/s along adsorbent bed 4 axial mean air flow speed when obstacle 3 is not set, and speed has reduced by 17.7%.Simultaneously, because the adding of obstacle 3 makes that near the gas the wall mixes with the gas at absorber middle part, can reduce the loss of displacement stage carbon monoxide like this, thereby improve the rate of recovery of carbon monoxide.
Claims (11)
1, a kind of absorber that reduces wall effect, comprise absorber body of the tower (1), be arranged on the gas distributor (2 of body of the tower (1) upper and lower part, 5), and gas distributor (2 up and down, 5) adsorbent bed between (4) is characterized in that the inwall of described absorber body of the tower (1) is provided with obstacle (3).
2, the absorber that reduces wall effect according to claim 1 is characterized in that described obstacle (3) is at least one.
3, the absorber that reduces wall effect according to claim 1 is characterized in that described obstacle (3) helical form is fixed on the inwall of absorber body of the tower (1).
4, the absorber that reduces wall effect according to claim 3, the pitch that it is characterized in that described obstacle (3) is 200～500mm.
5, the absorber that reduces wall effect according to claim 1 is characterized in that described obstacle (3) annular is fixed on the inwall of absorber body of the tower (1).
6, the absorber that reduces wall effect according to claim 5, it is a plurality of to it is characterized in that described obstacle (3) has, between this annular obstacle (3) at a distance of 200～500mm.
7, according to any described absorber that reduces wall effect of claim 1～6, it is characterized in that described obstacle (3) is provided with through hole.
8,, it is characterized in that described obstacle (3) is a random geometry in the axial cross section of adsorbent bed (4) according to any described absorber that reduces wall effect of claim 1～6.
9, the absorber that reduces wall effect according to claim 8 is characterized in that described cross section is any one in rectangle, trapezoidal and corner rounding trapezoidal.
10, according to any described absorber that reduces wall effect of claim 1～6, it is characterized in that described cross section is 5～10 times of adsorbent particle diameter in the axial maximum height of adsorbent bed (4), radially Breadth Maximum is 2～10 times of adsorbent particle diameter.
11, want the 9 described absorbers that reduce wall effect according to right, it is characterized in that described cross section is 5～10 times of adsorbent particle diameter in the axial maximum height of adsorbent bed (4), radially Breadth Maximum is 2～10 times of adsorbent particle diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100453792A CN101310828A (en) | 2008-02-20 | 2008-02-20 | Absorber for reducing wall effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100453792A CN101310828A (en) | 2008-02-20 | 2008-02-20 | Absorber for reducing wall effect |
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| CN101310828A true CN101310828A (en) | 2008-11-26 |
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| CNA2008100453792A Pending CN101310828A (en) | 2008-02-20 | 2008-02-20 | Absorber for reducing wall effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104667573A (en) * | 2013-11-27 | 2015-06-03 | 北大方正集团有限公司 | Method for lowering wall flow effect of chromatographic column |
| JP2016043352A (en) * | 2014-08-22 | 2016-04-04 | Ｊｆｅスチール株式会社 | Adsorption tower of pressure swing adsorption type gas separation unit |
-
2008
- 2008-02-20 CN CNA2008100453792A patent/CN101310828A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104667573A (en) * | 2013-11-27 | 2015-06-03 | 北大方正集团有限公司 | Method for lowering wall flow effect of chromatographic column |
| JP2016043352A (en) * | 2014-08-22 | 2016-04-04 | Ｊｆｅスチール株式会社 | Adsorption tower of pressure swing adsorption type gas separation unit |
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Open date: 20081126 |