CN110115912B - Composite sleeve type filler - Google Patents
Composite sleeve type filler Download PDFInfo
- Publication number
- CN110115912B CN110115912B CN201910369779.7A CN201910369779A CN110115912B CN 110115912 B CN110115912 B CN 110115912B CN 201910369779 A CN201910369779 A CN 201910369779A CN 110115912 B CN110115912 B CN 110115912B
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- Prior art keywords
- outer ring
- ring body
- holes
- core body
- filler
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- 239000000945 filler Substances 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- 239000004033 plastic Substances 0.000 claims abstract description 19
- 229920003023 plastic Polymers 0.000 claims abstract description 19
- -1 polyethylene Polymers 0.000 claims abstract description 12
- 239000004698 Polyethylene Substances 0.000 claims abstract description 8
- 229920000573 polyethylene Polymers 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 8
- 239000010935 stainless steel Substances 0.000 claims abstract description 8
- 239000000779 smoke Substances 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 28
- 238000010521 absorption reaction Methods 0.000 description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 17
- 239000003546 flue gas Substances 0.000 description 17
- 238000007254 oxidation reaction Methods 0.000 description 16
- 238000012856 packing Methods 0.000 description 14
- 238000002474 experimental method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The application relates to a composite sleeve type filler which comprises an outer ring body, an inner core body arranged in the outer ring body, and a connecting piece connected between the outer ring body and the inner core body, wherein a first smoke channel is formed between the outer ring body and the inner core body. The application overcomes the defect that the filler in the market is in inverse proportion to the specific surface area and the porosity, is convenient to implement in manufacturing, has the advantages of larger specific surface area and larger porosity, has the direct proportion of the relation between the specific surface area and the porosity, and increases the porosity while increasing the specific surface area; when two materials are used inside and outside the sleeve structure, the polyethylene plastic inside meets the requirements of biomembrane adhesiveness and has better corrosion resistance, and the stainless steel outside has better mechanical property and corrosion resistance.
Description
Technical Field
The application relates to the field of chemical filler tower flue gas treatment, in particular to a composite material sleeve type filler.
Background
At present, most of industrial waste gas is prevented and treated by absorbing harmful gas in a spraying mode by a packing tower, the packing tower takes packing as a basic component for gas-liquid contact and mass transfer, liquid flows in a film shape from top to bottom on the surface of the packing, gas flows in a continuous phase from bottom to top in a direction with the liquid, and mass transfer and heat transfer are carried out between the gas and the liquid, so that the structural form of the packing determines the absorption efficiency.
From the shape of the packing, from the earliest Raschig ring to the later saddle packing, to the pall ring, the Natt ring, the step ring and the like, the packing in the forms is of a single-layer structure, so that the liquid can only play a wetting role on the outer surface and the inner surface of the single-layer packing, and a larger space exists in the annular packing and cannot be reasonably utilized, so that the gradient flow range of the liquid is limited, and the utilization efficiency of the whole space is not high.
From the aspect of the material of the filler, the plastic filler is divided into plastic filler, ceramic filler and metal filler, wherein the plastic filler has the advantages of light weight, low cost, good toughness, impact resistance, difficult breakage and the like, but has poor surface wettability; the ceramic filler has good corrosion resistance, low price and good wettability, but the brittle quality is a main factor for restricting the development of the ceramic filler; the metal filler has high impact resistance, can be used in high-temperature high-pressure high-impact environment, has good surface wettability, but is not corrosion-resistant and has high manufacturing cost. In summary, each filler material has only its own properties and is not fully processable.
Disclosure of Invention
The application aims to provide a composite sleeve type filler which is suitable for flue gas treatment.
In order to achieve the above purpose, the application adopts the following technical scheme:
a composite sleeve type filler comprises an outer ring body, an inner core body arranged in the outer ring body, and a connecting piece connected between the outer ring body and the inner core body, wherein a first smoke channel is formed between the outer ring body and the inner core body.
Preferably, the inner core body is an inner ring body, the outer ring body and the inner ring body are coaxially arranged, and the second flue gas channel is formed in the inner ring body.
Further preferably, the peripheral surface of the inner ring body is provided with an inner ring hole.
Further preferably, the inner ring body is a circular ring.
Preferably, the outer ring body is a metal ring body, and the inner core body is a plastic core body.
Further preferably, the metal ring body is a stainless steel ring body, and the plastic core body is a polyethylene plastic core body or a polypropylene plastic core body.
Preferably, the peripheral surface of the outer ring body is provided with an outer ring hole.
Further preferably, the outer ring hole comprises a first outer ring hole, a second outer ring hole and a third outer ring hole, and the second outer ring hole and the third outer ring hole are arranged at intervals along the circumferential direction of the outer ring body.
Preferably, the outer ring body is a circular ring.
Preferably, one of the outer ring body and the inner core body is connected with one end of the connecting piece, and the peripheral surface of the other end of the connecting piece is provided with a groove, and the other end of the connecting piece is inserted into the groove.
Preferably, the height of the inner core body is not greater than the height of the outer ring body.
Further preferably, the height of the inner core body is smaller than the height of the outer ring body.
Due to the application of the technical scheme, compared with the prior art, the application has the following advantages and effects:
the application overcomes the defect that the filler in the market is in inverse proportion to the specific surface area and the porosity, is convenient to implement in manufacturing, has the advantages of larger specific surface area and larger porosity, has the direct proportion of the relation between the specific surface area and the porosity, and increases the porosity while increasing the specific surface area;
the sleeve structure is internally and externally made of two materials, the polyethylene plastic in the sleeve structure meets the requirements of biomembrane adhesiveness and has better corrosion resistance, and the stainless steel in the sleeve structure has better mechanical property and corrosion resistance.
Drawings
Fig. 1 is a schematic perspective view of the structure of the present embodiment;
FIG. 2 is a schematic side view of the structure of the present embodiment;
FIG. 3 is a schematic plan view of the structure of the present embodiment;
fig. 4 is a schematic connection diagram of the connecting piece and the outer ring body in the present embodiment.
Wherein: 1. an outer ring body; 10. a first outer annular ring; 11. a second outer annular ring; 12. a third outer annular ring; 13. a concave groove; 2. an inner ring body; 20. an inner annular hole; 3. a connecting piece; 4. a first flue gas channel; 5. and a second flue gas channel.
Detailed Description
The application is described below with reference to the accompanying drawings and examples:
the composite sleeve type filler as shown in fig. 1-3 comprises an outer ring body 1, an inner core body arranged in the outer ring body 1, and a connecting piece 3 connected between the outer ring body 1 and the inner core body, wherein a first smoke channel 4 is formed between the outer ring body 1 and the inner core body.
The outer ring body 1 is a circular ring. In this example, the dimensions are exemplified by an outer diameter of 25mm, a height of 25mm, and a thickness of 0.8 mm. An outer ring hole is formed on the peripheral surface of the outer ring body 1 in a punching or cutting mode, wherein: the outer ring holes comprise a first outer ring hole 10, a second outer ring hole 11 and a third outer ring hole 12, wherein the first outer ring hole 10 is 12mm multiplied by 5mm in size, four outer ring holes are arranged, and a row of outer ring holes is arranged along the circumferential direction of the outer ring body 1; the second outer ring hole 11 has the size of 5mm multiplied by 10mm, the third outer ring hole 12 has the size of 10mm multiplied by 10mm, and the second outer ring hole 11 and the third outer ring hole 12 are arranged in a row at intervals along the circumferential direction of the outer ring body; the first outer ring hole 10 is distributed above the second outer ring hole 11 and the third outer ring hole 12.
The inner core body is an inner ring body 2 and also a circular ring, and is coaxially arranged with the outer ring body 1, and a second flue gas channel 5 is formed in the inner ring body 2 to form a sleeve type structure. In this example, the dimensions are 10mm in outside diameter, 25mm in height, and 1mm in thickness. The peripheral surface of the inner ring body 2 is provided with inner ring holes 20, the size of the inner ring holes 20 is 8mm multiplied by 5mm, and the inner ring holes 20 are arranged in three rows, four in each row, along the circumferential direction of the inner ring body.
As shown in fig. 4: the two ends of the connecting piece 3 are respectively connected with the outer ring body 1 and the inner ring body 2. In this embodiment: one end of the connecting piece 3 is connected with the inner ring body 2, and the member can be processed by adopting an injection molding one-step forming method, and two members are respectively arranged up and down, and the total number of the members is four; the inner peripheral surface of the outer ring body 1 is provided with grooves 13 which are arranged at positions corresponding to the connecting pieces 3 and are in quantity, the whole connecting piece is manufactured in a hot processing or cold processing mode, and the connecting pieces 3 which are formed by one-time injection molding are pushed into the grooves 13 of the outer ring body 1 so as to complete connection of the connecting pieces.
Characteristic parameters:
(1) Specific surface area: represents the surface area (m 2 /m 3 ) The method comprises the steps of carrying out a first treatment on the surface of the The specific surface area of the filler of this example was found to be 237 by experiment and calculation.
(2) Porosity: when the tower is in a dry state, the ratio of the volume occupied by the hollow part in the packing layer to the volume of the packing layer in the tower.
ε＝(V 0 -V)/V 0 ＝1-V/V 0 ，
Epsilon is the porosity, m 3 /m 3 ；
V is the volume of the pores in the filler layer, m 3 ；
V 0 For the total volume of one packing layer, m 3 。
The numerical value of the porosity of the filler of this example was found to be 0.937 by experiment and calculation.
(3) And comparing characteristic parameters of other fillers with the same nominal size as those of the domestic and foreign parts:
(4) By comparing the data, the parameters obtained by calculating the specific surface area and the porosity of the embodiment are better, and the porosity is increased along with the increase of the specific surface area of the embodiment, so that compared with the fillers in the other forms, the common problem that the porosity is reduced along with the increase of the specific surface area is overcome.
In this embodiment: the outer ring body 1 is a metal ring body, and the inner ring body 2 is a plastic core body. The method comprises the following steps: the metal ring body is a stainless steel ring body, and the plastic core body is a polyethylene plastic core body or a polypropylene plastic core body.
To further illustrate the absorption efficiency of this packing, the following description will be given in connection with three examples and one comparative example, with the aim of highlighting the advantages thereof.
Embodiment one:
when polyethylene plastic is used as the outer ring body 1 and the inner ring body material in the embodiment, the absorption efficiency of the filler is analyzed by using an absorption purification experiment of NOx in flue gas, and the specific contents are as follows:
(1) In the embodiment, laboratory simulation gas is used as the gas to be treated, the gas flow is 450mL/min, and NO is 280mg/m 3 ，NO 2 The content is 20mg/m 3 Under the condition of constant temperature of 26 ℃, the gas enters a small ozone oxidation chamber to perform oxidation reaction, and the oxidation reaction is completedThen introducing the gas into a laboratory small-sized absorption tower;
(2) The main component of the gas after the oxidation reaction of the previous step is NO 2 The flue gas also contains a small amount of unoxidized NO, the denitration efficiency obtained after spraying and absorbing by the absorption tower is about 93%, and the content of NOx in the outlet flue gas is less than or equal to 11.7mg/m 3 。
Embodiment two:
when stainless steel is used as the outer ring body 1 and the inner ring body material in the embodiment, the absorption efficiency of the filler is analyzed by using an absorption purification experiment of NOx in flue gas, and the specific contents are as follows:
(1) In the embodiment, laboratory simulation gas is used as the gas to be treated, the gas flow is 450mL/min, and NO is 280mg/m 3 ，NO 2 The content is 20mg/m 3 Under the condition of constant temperature of 26 ℃, the gas enters a small ozone oxidation chamber for oxidation reaction, and after the oxidation reaction is completed, the gas is introduced into a small absorption tower in a laboratory;
(2) The main component of the gas after the oxidation reaction of the previous step is NO 2 The flue gas also contains a smaller amount of unoxidized NO, the denitration efficiency obtained after spraying and absorbing by the absorption tower is about 92%, and the content of NOx in the outlet flue gas is less than or equal to 11.9mg/m 3 。
Embodiment III:
when a stainless steel material is used as the outer ring body 1 of the present embodiment and polyethylene plastic is used as the inner ring body 2 of the present embodiment, the absorption efficiency of the filler is analyzed by using an absorption purification experiment of NOx in the flue gas, and the specific contents are as follows:
(1) In the embodiment, laboratory simulation gas is used as the gas to be treated, the gas flow is 450mL/min, and NO is 280mg/m 3 ，NO 2 The content is 20mg/m 3 Under the condition of constant temperature of 26 ℃, the gas enters a small ozone oxidation chamber for oxidation reaction, and after the oxidation reaction is completed, the gas is introduced into a small absorption tower in a laboratory.
(2) The main component of the gas after the oxidation reaction of the previous step is NO 2 Wherein the catalyst also contains a smaller amount of unoxidized NO, and the denitration effect is obtained after spray absorption by an absorption towerThe rate is about 95%, and the content of NOx in the outlet flue gas is less than or equal to 10mg/m 3 。
Comparative example one:
when the pall ring with the same nominal diameter as the embodiment is adopted, the absorption efficiency of the filler is analyzed by utilizing an absorption and purification experiment of NOx in the flue gas, and the specific contents are as follows:
(1) In the embodiment, laboratory simulation gas is used as the gas to be treated, the gas flow is 450mL/min, and NO is 280mg/m 3 ，NO 2 The content is 20mg/m 3 Under the condition of constant temperature of 26 ℃, the gas enters a small ozone oxidation chamber for oxidation reaction, and after the oxidation reaction is completed, the gas is introduced into a small absorption tower in a laboratory.
(2) The main component of the gas after the oxidation reaction of the previous step is NO 2 The flue gas also contains a smaller amount of unoxidized NO, the denitration efficiency obtained after spray absorption by the absorption tower is about 90%, and the content of NOx in the outlet flue gas is less than or equal to 14.9mg/m 3 。
From this, it can be seen that: aiming at the defect of insufficient comprehensive treatment capacity of the existing single-layer structure filler, the application develops a composite material sleeve type filler, namely the porosity of the filler is not reduced while the overall space utilization rate (the specific surface area is increased) of the filler is greatly improved, and the reverse porosity is slightly improved, and the composite material is combined by adopting materials with two characteristics, so that a novel filler with novel shape and structure and high treatment efficiency is formed. In order to meet the circulation characteristic, the application has relatively large specific surface area, relatively high porosity, smooth fluid path, small resistance and uniform flow velocity; in order to meet the adhesiveness of the biological film, the inner ring body is made of polyethylene and polypropylene engineering plastics; in order to meet the chemical stability, the application is durable, the outer ring body is made of stainless steel with corrosion resistance, and the surface wettability is good while the outer ring body has higher mechanical property.
The above embodiments are provided to illustrate the technical concept and features of the present application and are intended to enable those skilled in the art to understand the content of the present application and implement the same, and are not intended to limit the scope of the present application. All equivalent changes or modifications made in accordance with the spirit of the present application should be construed to be included in the scope of the present application.
Claims (3)
1. A composite sleeve-type filler, characterized by: the smoke-exhausting device comprises an outer ring body, an inner core body arranged in the outer ring body, and a connecting piece connected between the outer ring body and the inner core body, wherein a first smoke channel is formed between the outer ring body and the inner core body, the inner core body is an inner ring body, the outer ring body and the inner ring body are coaxially arranged, and a second smoke channel is formed in the inner ring body;
the outer ring body is a circular ring, the outer diameter of the outer ring body is 25mm, the height of the outer ring body is 25mm, the thickness of the outer ring body is 0.8mm, the inner ring body is a circular ring, the outer diameter of the inner ring body is 10mm, the height of the inner ring body is 25mm, and the thickness of the inner ring body is 1m;
the outer ring body is provided with outer ring holes, each outer ring hole comprises a first outer ring hole, a second outer ring hole and a third outer ring hole, the first outer ring holes are arranged in a row along the circumferential direction of the outer ring body, the sizes of the first outer ring holes are 12X 5mm, the second outer ring holes and the third outer ring holes are arranged in a row at intervals along the circumferential direction of the outer ring body, the first outer ring holes are distributed above the second outer ring holes and the third outer ring holes, the sizes of the second outer ring holes are 5X 10mm, and the sizes of the third outer ring holes are 10X 10mm; the periphery of the inner ring body is provided with inner ring holes, three rows of the inner ring holes are arranged along the circumferential direction of the inner ring body, four inner ring holes are arranged in each row, and the size of each inner ring hole is 8 multiplied by 5mm;
one of the outer ring body and the inner core body is connected with one end of the connecting piece, and the peripheral surface of the other one of the outer ring body and the inner core body is provided with a groove, the other end of the connecting piece is inserted into the groove, two connecting pieces are respectively arranged up and down, and four connecting pieces are arranged in total.
2. The composite sleeve filler of claim 1, wherein: the outer ring body is a metal ring body, and the inner core body is a plastic core body.
3. The composite sleeve filler of claim 2, wherein: the metal ring body is a stainless steel ring body, and the plastic core body is a polyethylene plastic core body or a polypropylene plastic core body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910369779.7A CN110115912B (en) | 2019-05-06 | 2019-05-06 | Composite sleeve type filler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910369779.7A CN110115912B (en) | 2019-05-06 | 2019-05-06 | Composite sleeve type filler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110115912A CN110115912A (en) | 2019-08-13 |
| CN110115912B true CN110115912B (en) | 2023-12-08 |
Family
ID=67521749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910369779.7A Active CN110115912B (en) | 2019-05-06 | 2019-05-06 | Composite sleeve type filler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110115912B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111530408A (en) * | 2020-03-26 | 2020-08-14 | 苏州仕净环保科技股份有限公司 | Spherical filler |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3506248A (en) * | 1968-02-21 | 1970-04-14 | United Air Specialists | Tower packing unit |
| GB1275116A (en) * | 1969-10-08 | 1972-05-24 | Hydronyl Ltd | Improvements in or relating to biological filters |
| CN2558449Y (en) * | 2002-04-23 | 2003-07-02 | 胡萍德 | Ring-in-ring packing |
| CN2558450Y (en) * | 2002-04-23 | 2003-07-02 | 胡萍德 | Trifoil ring packing |
| CN101564671A (en) * | 2009-04-17 | 2009-10-28 | 姚光纯 | Plastic leaf ring packing |
| CN202700503U (en) * | 2012-07-04 | 2013-01-30 | 宁波科新化工工程技术有限公司 | Pall ring |
| EP3338885A1 (en) * | 2016-12-23 | 2018-06-27 | Fundacion Gaiker | Carrier device |
| CN208554217U (en) * | 2018-05-28 | 2019-03-01 | 江西萍乡龙发实业股份有限公司 | Built-in cylindrical ceramic filler |
| CN109654935A (en) * | 2018-12-19 | 2019-04-19 | 中冶焦耐(大连)工程技术有限公司 | Concentric ring pine material layer filler |
-
2019
- 2019-05-06 CN CN201910369779.7A patent/CN110115912B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3506248A (en) * | 1968-02-21 | 1970-04-14 | United Air Specialists | Tower packing unit |
| GB1275116A (en) * | 1969-10-08 | 1972-05-24 | Hydronyl Ltd | Improvements in or relating to biological filters |
| CN2558449Y (en) * | 2002-04-23 | 2003-07-02 | 胡萍德 | Ring-in-ring packing |
| CN2558450Y (en) * | 2002-04-23 | 2003-07-02 | 胡萍德 | Trifoil ring packing |
| CN101564671A (en) * | 2009-04-17 | 2009-10-28 | 姚光纯 | Plastic leaf ring packing |
| CN202700503U (en) * | 2012-07-04 | 2013-01-30 | 宁波科新化工工程技术有限公司 | Pall ring |
| EP3338885A1 (en) * | 2016-12-23 | 2018-06-27 | Fundacion Gaiker | Carrier device |
| CN208554217U (en) * | 2018-05-28 | 2019-03-01 | 江西萍乡龙发实业股份有限公司 | Built-in cylindrical ceramic filler |
| CN109654935A (en) * | 2018-12-19 | 2019-04-19 | 中冶焦耐(大连)工程技术有限公司 | Concentric ring pine material layer filler |
Non-Patent Citations (1)
| Title |
|---|
| 张建伟主编.《化工单元操作实验与设计》.天津大学出版社,2012,第237-238页. * |
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| CN110115912A (en) | 2019-08-13 |
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