CN105575452A - Application method for drying agent in silica gel drying unit of inert gas retention system - Google Patents
Application method for drying agent in silica gel drying unit of inert gas retention system Download PDFInfo
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- CN105575452A CN105575452A CN201410538530.1A CN201410538530A CN105575452A CN 105575452 A CN105575452 A CN 105575452A CN 201410538530 A CN201410538530 A CN 201410538530A CN 105575452 A CN105575452 A CN 105575452A
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- drying agent
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- inert gas
- silica gel
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Abstract
The invention relates to a radioactive waste gas treatment technology, specifically to an application method for a drying agent in a silica gel drying unit of an inert gas retention system. The method comprises the following advantages: respectively filling a fine-pore silica gel drying agent and a water-resistant wide-pore silica gel drying agent into a drying bed, wherein the mass ratio of the fine-pore silica gel drying agent and the water-resistant wide-pore silica gel drying agent is (2:1) to (10:1); during a dehumidification drying process of the drying unit of the inert gas retention system, allowing airflow to successively pass through the water-resistant wide-pore silica gel drying agent and the fine-pore silica gel drying agent; and during a drying regeneration process of the drying unit of the inert gas retention system, allowing the airflow to successively pass through the fine-pore silica gel drying agent and the water-resistant wide-pore silica gel drying agent.
Description
Technical field
The present invention relates to radioactive emission treatment technology, be specifically related to a kind of inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method.
Background technology
Third generation reactor type nuclear power station exhaust treatment system all uses activated charcoal to be detained the fission gas of bed delay decay from reactor core release, comprising radioactivity inertia process gas krypton and xenon.Enter activated charcoal delay bed air-flow relative humidity size and directly affect the activated charcoal retention performance being detained and using in bed, if air-flow relative humidity is too high, activated charcoal absorption property after moisture absorption decreases and even lost efficacy, exhaust treatment system and up-stream system may be caused to lose efficacy, therefore waste gas humidity control to be the key factor affecting activated charcoal life-span and system availability.Air-flow is after dehumidification by condensation, and before entering activated charcoal delay bed, inlet relative humidity need control below 20%.General activated charcoal or the silica dehydrator bed of using before active-carbon bed controls air-flow relative humidity at present, needs to carry out special design to the concrete use-pattern of Spent Radioactive gas processing system drying unit drying agent.
Summary of the invention
The object of the present invention is to provide a kind of inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method, to improve the processing power of inert gas gaseous-waste holdup system.
Technical scheme of the present invention is as follows: a kind of inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method, in drying bed, load Kiselgel A drying agent and water-fast silochrom drying agent respectively, the mass ratio of described Kiselgel A drying agent and water-fast silochrom drying agent is 2:1-10:1; Inert gas gaseous-waste holdup system when carrying out removal moisture drying technique, air-flow first through water-fast silochrom drying agent, then through Kiselgel A drying agent; Inert gas gaseous-waste holdup system when carrying out drying regeneration process, air-flow first through Kiselgel A drying agent, then through water-fast silochrom drying agent.
Further, inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method as above, wherein, described Kiselgel A drying agent is spheric grain, and particle size is 1-5mm, and bulk density is 700-800g/L.
Further, inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method as above, wherein, described water-fast silochrom drying agent is spheric grain, and particle size is 1-5mm, and bulk density is 400-500g/L.
Beneficial effect of the present invention is as follows: the present invention makes full use of dissimilar silica-gel desiccant absorption property feature, and design fills arrangement accordingly.Inert gas gaseous-waste holdup system drying unit is when carrying out removal moisture drying technique, entrance high relative humidity air-flow first has the water-fast silochrom drying agent of high-adsorption-capacity under super-humid conditions, low relative humidity air-flow after silochrom absorption has the Kiselgel A drying agent of high-adsorption-capacity again under low humidity conditions, while making full use of adsorption capacity, can prevent the chance water droplet of silica-gel desiccant from bursting; Inert gas gaseous-waste holdup system drying unit is when carrying out drying regeneration process, and air-flow first through Kiselgel A drying agent, then through water-fast silochrom drying agent, effectively can improve regeneration efficiency, reduces regeneration consuming time.
Accompanying drawing explanation
Fig. 1 is the use-pattern schematic diagram of two kinds of silica-gel desiccants in silica dehydrator bed.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The invention provides a kind of radioactivity inert gas and be detained disposal system drying unit silica-gel desiccant using method, as shown in Figure 1, in drying bed, load two kinds of silica-gel desiccants, be respectively the Kiselgel A drying agent 1 of aperture 2-4nm and the water-fast silochrom drying agent 2 of aperture 6-12nm.The filling mass ratio of described Kiselgel A drying agent 1 and water-fast silochrom drying agent 2 is 2:1-10:1.
Inert gas gaseous-waste holdup system comprises removal moisture drying technique and drying regeneration process, and removal moisture drying technique is that the radioactivity inert gas that need process passes into drying bed, is dehumidified to gas by the absorption of drying bed; Drying regeneration process is that thermal current is passed into drying bed, carries out drying regeneration to drying agent.
In the present invention, inert gas gaseous-waste holdup system is when carrying out removal moisture drying technique, and air-flow enters from adsorption and dehumidification airflow inlet 6, first through water-fast silochrom drying agent 2, then through Kiselgel A drying agent 1, discharges from adsorption and dehumidification air stream outlet 4; Inert gas gaseous-waste holdup system is when carrying out drying regeneration process, and air-flow enters from dry regeneration air stream import 3, first through Kiselgel A drying agent 1, then through water-fast silochrom drying agent 2, discharges from dry regeneration air stream outlet 5.
The performance requirement difference of the Kiselgel A drying agent used in drying bed and water-fast silochrom drying agent is as follows:
Kiselgel A drying agent performance requirement
| Parameter name | Required value |
| Adsorption capacity (relative humidity is greater than 90%), % >= | 30 |
| Attrition rate, %≤ | 10％ |
| Particle diameter, mm | 1-5 |
| Shape | Spherical |
| Granularity qualification rate >= | 96％ |
| Heating loss≤ | 5％ |
| Bulk density | 700-800g/L |
Water-fast silochrom drying agent performance requirement
| Index name | Required value |
| Particle diameter, mm | 1-5 |
| Shape | Spherical |
| Granularity qualification rate % >= | 95 |
| Bulk density g/L | 400-500 |
| Meet water do not burst rate % >= | 96 |
| Plus-minus heat≤ | 4.0 |
| Saturated extent of adsorption (relative humidity is greater than 90%), %, >= | 73.0 |
| Attrition rate, % | 2.0 |
| Crush strength, N >= | 98.0 |
Embodiment
For AP1000 exhaust treatment system, pneumatic conveying drying bed can use silica-gel desiccant to replace activated charcoal.Use the FNG-II water-fast silochrom drying agent meeting above performance requirement respectively with used in combination without cobalt Kiselgel A drying agent, filling mass ratio is 1:3.During removal moisture drying, air-flow is first through the water-fast silochrom drying agent of FNG-II, pass through without cobalt Kiselgel A drying agent again, drying agent carries out drying to air-flow, after drying bed exit flow relative humidity reaches 20%, air drying or 120 DEG C of thermal currents are used to regenerate, during dry regeneration, air-flow first passes through without cobalt Kiselgel A drying agent, then through the water-fast silochrom drying agent of FNG-II.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technology thereof, then the present invention is also intended to comprise these change and modification.
Claims (3)
1. an inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method, it is characterized in that: in drying bed, load Kiselgel A drying agent and water-fast silochrom drying agent respectively, the mass ratio of described Kiselgel A drying agent and water-fast silochrom drying agent is 2:1-10:1; Inert gas gaseous-waste holdup system when carrying out removal moisture drying technique, air-flow first through water-fast silochrom drying agent, then through Kiselgel A drying agent; Inert gas gaseous-waste holdup system when carrying out drying regeneration process, air-flow first through Kiselgel A drying agent, then through water-fast silochrom drying agent.
2. inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method as claimed in claim 1, it is characterized in that: described Kiselgel A drying agent is spheric grain, particle size is 1-5mm, and bulk density is 700-800g/L.
3. inert gas gaseous-waste holdup system silica dehydrator unit drying agent using method as claimed in claim 1, is characterized in that: described water-fast silochrom drying agent is spheric grain, and particle size is 1-5mm, and bulk density is 400-500g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410538530.1A CN105575452B (en) | 2014-10-13 | 2014-10-13 | Radioactivity inert gas gaseous-waste holdup system silica dehydrator unit desiccant application method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410538530.1A CN105575452B (en) | 2014-10-13 | 2014-10-13 | Radioactivity inert gas gaseous-waste holdup system silica dehydrator unit desiccant application method |
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| Publication Number | Publication Date |
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| CN105575452A true CN105575452A (en) | 2016-05-11 |
| CN105575452B CN105575452B (en) | 2019-08-30 |
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| CN201410538530.1A Active CN105575452B (en) | 2014-10-13 | 2014-10-13 | Radioactivity inert gas gaseous-waste holdup system silica dehydrator unit desiccant application method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110097991A (en) * | 2018-01-31 | 2019-08-06 | 中国辐射防护研究院 | Removable radioactive gas recovery system is used under a kind of emergency conditions |
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| CN110097991A (en) * | 2018-01-31 | 2019-08-06 | 中国辐射防护研究院 | Removable radioactive gas recovery system is used under a kind of emergency conditions |
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| CN105575452B (en) | 2019-08-30 |
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