CN105233516A - Large-throughput packing tower based on high-throughput regular packing - Google Patents
Large-throughput packing tower based on high-throughput regular packing Download PDFInfo
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- CN105233516A CN105233516A CN201510647245.8A CN201510647245A CN105233516A CN 105233516 A CN105233516 A CN 105233516A CN 201510647245 A CN201510647245 A CN 201510647245A CN 105233516 A CN105233516 A CN 105233516A
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Abstract
The invention discloses a large-throughput packing tower based on a high-throughput regular packing as a support, specifically, the regular packing with lower specific surface area or larger throughput is placed at the lower end of a low-throughput regular packing, so that the operation throughput of the whole tower can be effectively improved, and pressure dropping is lowered.
Description
Technical field
The invention belongs to field of chemical equipment, be specifically related to a kind of large flux packed tower supported based on high flux random packing.
Background technology
Packed tower is a kind of important mass transfer apparatus, for carrying out mass transfer in solution-air, liquid-liquid two-phase or chemical reaction.Packed tower is widely used in the process such as rectifying, absorption, extraction, washing of chemical industry, oil, medicine, environmental protection, field of food.
The economic and technical norms of stuctures and properties on packed tower of filler have conclusive impact.Filler can be divided into loose heap-type filler and regular type filler by structure, and loose heap-type filler is formed some random stackings of filler particles with certain geometrical shape.The geometry of loose heap-type filler has a great impact packed tower performance.Typical loose heap-type filler has Raschig ring, Pall ring, cascade ring, θ ring etc.
" separation process and the equipment " 234 pages that Chemical Industry Press publishes is mentioned: in packing layer, liquid flowing state can be divided into three intervals: 1. operate under low speed; 2. gas speed increases gradually, and liquid holdup increases, and is called carrier fluid district; 3. gas speed increases further, and the interaction of gas-liquid two-phase reaches very severe degree, and liquid holdup sharply increases with the minor variations of gas speed, and after this packing layer top starts hydrops and is attended by the phenomenons such as serious fluid spills and entrainment, is called liquid flooding district.Filler liquid flooding may in packing layer top, packing layer or support place of filler lower surface cause." tower " 183 pages that Chemical Industry Press publishes is mentioned: a large amount of practice drawing: liquid flooding often from support plate kept man of a noblewoman first.The common feature of random packing is, the packing efficiency that particle is little, bulk density is high is high, but flux is low; The packing efficiency that particle is large, bulk density is low is low, but flux is high.
Number of patent application be CN201410554212.4 patent discloses a kind of packed tower liquid flooding Forecasting Methodology based on pressure drop specifications variance analysis, comprise the following steps: 1) pressure drop pressure tap is circumferentially set at each packing layer of packed tower; 2) intelligent differential pressure transmitter to be connected with pressure drop pressure tap by pressure-measuring pipe and to detect in real time; 3) pressure drop data is sent to data acquisition unit by data wire by intelligent differential pressure transmitter, then carries out change curve and pressure drop specifications deviation profile curve that data processing obtains pressure drop tower operation flux; 4) using pressure drop specifications deviation profile curve as the foundation judging this packed tower liquid flooding, when the slope of standard deviation curves exceedes critical value, be liquid flooding state, the frequency acquisition of pressure drop pressure tap is greater than 20 hertz.In prior art, the technology about packed tower liquid flooding prediction or monitoring is more, lacks less to the report how solving this problem.
Summary of the invention
To producing the problem brought in order to solve packed tower liquid flooding in prior art, the invention provides a kind of large flux packed tower supported based on high flux random packing, in order to postpone or avoid the arrival of liquid flooding in packed tower, enhance productivity.The technical solution used in the present invention is as follows:
Be the large flux packed tower supported based on high flux structured packing, place lower compared with upper end structured packing specific area or that flux is larger structured packing in the lower end of structured packing.
The material of described filler is metal, plastics, pottery, carbon fiber.
The filler that the flux of described lower floor is larger can adopt identical or different material with upper strata filler.
The height of described upper strata structured packing is 0.1m to 100m, and the height of the large flux structured packing of lower floor is 0.1m to 100m.
Described packed tower is rectifying column, absorption tower or extraction tower.
In experimentation, find high-specific surface area filler 500X, 700X, according to relevant industries standard, lower surface is because crest height is low, packing sheet spacing is little, water surface tension is large, there is the coalescence phenomenon of liquid, block gas circuit, cause gas speed to increase, easier entrained liquids, causes liquid flooding.Find in experimentation that 500X and 700X filler is all liquid flooding from the bottom of tower, this and tower top kinetic energy factor are above greatly, the supposition of easier liquid flooding is contradiction.Because common fillers supports on the low side to the drainage point of filler lower surface, drainage is not strong, adopts low specific surface area filler to strengthen the arrival of drainage or deferrable liquid flooding.
The present invention can avoid the liquid flooding of filler lower surface, effectively can improve the operation flux of full tower, reduce pressure drop, make liquid flooding occur in tower top, can effectively increase filler flux.
Accompanying drawing explanation
Fig. 1 is the hydrodynamic characteristic under 700X type structured packing difference supports.
When Fig. 2 is gas phase flux 40m3/h under 500X packing support condition, constant liquid phase flow presses down and falls figure.
Detailed description of the invention
Embodiment 1
For probing into the impact of packing support on flux, avoid the liquid flooding of filler lower surface support place, adopt Air-Water system more industrial grating type support, spiral plate type under the molar flow conditions such as gas-liquid two-phase to support and low specific surface area packing support, next block 700X filler is replaced with one piece of 5cm height stainless steel 500X, bed stuffing height is constant, support with spiral plate under 500X filler, three kinds of supporting way are on the impact of 700X filler flux.
Experimental provision and parameter: hydrodynamics adopts Air-Water system, glass tower internal diameter 102mm, and filler floor height 75cm(fills 15 blocks of 700X fillers).Gas phase flux peak 40m3/h, fluidounce flowmeter is in parallel, large capacity meter flux peak 500L/h, small flowmeter flux peak 60L/h.
Method of operating: after full tower liquid flooding, fixed air liquid phase flow (wait mole), surveys U-tube pressure reduction, gradually augmented flow, until liquid flooding after pressure drop stablizes 2 minutes.
Experimental result:
Etc. experimental result under molar flow as shown in Figure 1,2 experiment conclusion are obtained:
A. adopt grill support and spiral plate to support and have hydrops when 26L/h and 24L/h at next block filler respectively; During employing 500X packing support, liquid phase flux accomplishes 30L/h, gas phase flux 37.3m
3/ h is liquid flooding not.
B. adopt grill support substantially to conform to the hydrodynamics data that spiral plate supports, and after next block filler replaces to 500X filler, liquid phase flux 14L/h and above time pressure drop reduce 1/3 ~ 1/2.
Keep tolerance 40m
3/ h, continues to increase liquid measure, and experimental result as shown in Figure 2, because waiting molar flow experiment to limit by equipment gas phase flux, protects gas phase flux 40m by with the filler of 500X packing support
3/ h, constantly increase liquid phase flux, when liquid phase flux 180L/h, going up five blocks of fillers most has obvious bubbling hydrops phenomenon.Correspondingly be adopt the filler of industrial grill support at tolerance 32.4m
3when/h, liquid measure 26L/h, next block filler 2/3 has hydrops.
From above experimental result: add the liquid flooding that 500X filler can avoid filler lower surface under 700X filler, make liquid flooding occur in tower top, can effectively increase filler flux.
The discussion of the mechanism of action: grid three floors and 700X filler contact point about 67 in internal diameter 102mm tower, and 500X and 700X filler contact point about 482 are the former 7.2 times.When using grill support, grid place need be laterally moved to when partially liq moves to lower surface and drip along grid again; And when using 500X packing support, liquid moves to lower surface can by timely carrying-off.Therefore 500X filler to do supporting drainage effect stronger, avoid the coalescence of liquid in 700X lower surface.Although 500X filler originally also has the problem of liquid coalescence in lower surface, its flux allowed is greater than the flux constraint of 700X filler tower top.
Embodiment 2
For probing into the impact of packing support on flux, avoid the liquid flooding of filler lower surface support place, adopt Air-Water system more industrial grating type under the molar flow conditions such as gas-liquid two-phase to support and low specific surface area packing support, constant with two blocks of the most lower two blocks of 500Y fillers of 5cm height stainless steel 250X replacement, bed stuffing height; Directly use industrial grill support under 500Y filler, these two kinds of supporting way are on the impact of 500Y filler flux.
Experimental provision and parameter identical with embodiment 1.Experimental implementation is similar to Example 1.Experiment display, after replacing two blocks of 500Y fillers with the 250X filler that 10cm is high, filling batch step-down only has original 1/3 ~ 1/2, and full tower flux is increased to original 3 times, and liquid flooding is from tower top is gone up between two pieces of packing boxs most.
Embodiment 3
For probing into the impact of packing support on flux, avoid the liquid flooding of filler lower surface support place, adopt Air-Water system more industrial grating type under the molar flow conditions such as gas-liquid two-phase to support and low specific surface area packing support, load the 900X filler of the 250X filler of one block of 5cm height carbon fiber, one block of 5cm height stainless steel 500Y filler, 14 pieces of double-level-metal silk screens from top to bottom in order, packing layer total height 80cm; Directly use industrial grill support under 900Y filler, these two kinds of supporting way are on the impact of 900Y filler flux.
Experimental provision and parameter identical with embodiment 1.Experimental implementation is similar to Example 1.Experiment display, after replacing two blocks of 900Y fillers with the filler of two pieces of order fillings, under identical flux, filling batch step-down only has original 1/3 ~ 1/2, and full tower flux is increased to original 2.8 times, and liquid flooding is from tower top is gone up between two pieces of packing boxs most.
Claims (5)
1. be a large flux packed tower for support based on high flux structured packing, it is characterized in that placing lower compared with upper end structured packing specific area or that flux is larger structured packing in the lower end of structured packing.
2. packed tower according to claim 1, is characterized in that the material of structured packing is metal, plastics, pottery, carbon fiber.
3. packed tower according to claim 1, is characterized in that the filler that the specific area of lower end is lower or flux is larger can adopt identical or different material with upper end filler.
4. packed tower according to claim 1, is characterized in that the height of upper end structured packing is 0.1m to 100m, lower end specific area lower or the height of large flux structured packing be 0.05m to 100m.
5. packed tower according to claim 1, is characterized in that described packed tower is rectifying column, absorption tower or extraction tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510647245.8A CN105233516A (en) | 2015-10-09 | 2015-10-09 | Large-throughput packing tower based on high-throughput regular packing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510647245.8A CN105233516A (en) | 2015-10-09 | 2015-10-09 | Large-throughput packing tower based on high-throughput regular packing |
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| CN105233516A true CN105233516A (en) | 2016-01-13 |
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| CN201510647245.8A Pending CN105233516A (en) | 2015-10-09 | 2015-10-09 | Large-throughput packing tower based on high-throughput regular packing |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7928287A (en) * | 1986-10-02 | 1988-04-14 | Sulzer Brothers Limited | A liquid distribution facility for mass transfer and heat exchange columns |
| CN1194878A (en) * | 1997-04-03 | 1998-10-07 | 中国石油化工总公司 | Air compounded packing column plate |
| US20030090009A1 (en) * | 2000-03-08 | 2003-05-15 | Egon Zich | Liquid distributor and method for operating the same |
| CN102512838A (en) * | 2011-12-30 | 2012-06-27 | 浙江工业大学 | Structured corrugated packing bed suitable for high liquid quantity |
| CN203763876U (en) * | 2014-03-06 | 2014-08-13 | 湖州沙龙化工有限公司 | Packing tower section |
-
2015
- 2015-10-09 CN CN201510647245.8A patent/CN105233516A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7928287A (en) * | 1986-10-02 | 1988-04-14 | Sulzer Brothers Limited | A liquid distribution facility for mass transfer and heat exchange columns |
| CN1194878A (en) * | 1997-04-03 | 1998-10-07 | 中国石油化工总公司 | Air compounded packing column plate |
| US20030090009A1 (en) * | 2000-03-08 | 2003-05-15 | Egon Zich | Liquid distributor and method for operating the same |
| CN102512838A (en) * | 2011-12-30 | 2012-06-27 | 浙江工业大学 | Structured corrugated packing bed suitable for high liquid quantity |
| CN203763876U (en) * | 2014-03-06 | 2014-08-13 | 湖州沙龙化工有限公司 | Packing tower section |
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Application publication date: 20160113 |