CN110455098A - Winding tube type heat exchanger with baffle plate - Google Patents
Winding tube type heat exchanger with baffle plate Download PDFInfo
- Publication number
- CN110455098A CN110455098A CN201910785735.2A CN201910785735A CN110455098A CN 110455098 A CN110455098 A CN 110455098A CN 201910785735 A CN201910785735 A CN 201910785735A CN 110455098 A CN110455098 A CN 110455098A
- Authority
- CN
- China
- Prior art keywords
- shell
- heat exchanger
- baffle plate
- tube
- setting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 35
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 238000003780 insertion Methods 0.000 claims description 22
- 230000037431 insertion Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 12
- 230000008676 import Effects 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims 1
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 238000005192 partition Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A wound tube type heat exchanger with baffle plates comprises a shell, wherein a plurality of sections of spirally wound heat exchange tubes are arranged in the shell, and are formed by alternately winding a plurality of spirally wound tube sections and a plurality of straight tube sections; wherein, a plurality of combined baffle plates are respectively arranged between the straight pipe section and the shell, and the combined baffle plates are respectively vertically arranged along the axis of the shell; the shell is characterized in that tube plates are respectively arranged at two ends of the shell and are divided into a tube pass heat exchange area and a shell pass heat exchange area through the tube plates at the two ends. Through the improvement of the structure, the invention can effectively and conveniently install the baffle plate on the multi-section spiral winding heat exchange tube, thereby effectively eliminating the flowing dead zone of the shell pass, strengthening the disturbance of fluid of the shell pass, prolonging the heat exchange flow of the fluid, finally strengthening the heat transfer of the shell pass, saving consumables and energy, improving the integral heat exchange uniformity of the heat exchanger and having strong practicability.
Description
Technical field
The present invention relates to field of heat exchangers, specifically a kind of wrap-round tubular heat exchanger with baffle plate.
Background technique
Wrap-round tubular heat exchanger is the important list in the fields such as petrochemical industry, LNG technical process, methanol production and fine chemistry industry
Element device, and be a kind of heat exchange equipment of more efficient.Due to traditional wrap-round tubular heat exchanger, spiral winding tube bank is not
Intermittent spiral coiling, and water conservancy diversion filler strip is set between different pipe networks, shell side is difficult to that baffle plate is arranged, and traditional wound tubular type is caused to change
The fluid heat transfer process of hot device is shorter, will appear flow velocity retention areas, especially filler strip and heat exchanger tube between same layer pipe network adjacent tubes
Between region will cause flow dead zone, heat exchange efficiency is difficult to further increase, and heat exchanger overall heat exchange is uneven, heat-energy transducer
There is certain waste in power, therefore, it is necessary to overcome to disadvantages mentioned above and further perfect.
Summary of the invention
The purpose of the present invention be intended to provide it is a kind of it is simple and reasonable, have excellent performance, good effect of heat exchange, energy conservation and environmental protection, system
At low cost, Yi Shixian is made and the safe and reliable wrap-round tubular heat exchanger with baffle plate, to overcome deficiency in the prior art
Place.
By a kind of wrap-round tubular heat exchanger with baffle plate that this purpose designs, including shell, it is characterised in that: in shell
It is provided with multistage spiral winding heat exchanger tube, multistage spiral winding heat exchanger tube is by several spiral winding pipeline sections and several straight pipes
Alternate coiling forms；Wherein, several Combined baffle plates are respectively arranged between straight pipe and shell, several combined types folding
Flowing plate is vertically arranged along the axis of shell respectively；The shell both ends are also respectively provided with tube sheet and the tube sheet by both ends
It is separated into tube side and shell side heat exchange area.
The shell side is provided with shell side import and shell-side outlet, and end is provided with tube side import and tube side outlet；It steams
The tube side of hair device walks evaporative fluid, and the shell side of evaporator walks heat exchanging fluid；The shell side is single process, alternatively, shell side is more
The multistage spiral winding heat exchanger tube of process and different processes is parallel to each other, and is not stacked.
The heat exchanger tube of several straight pipes is arranged in parallel along the axis of shell respectively and forms rectangular tube between each other
Arrangement is set；Wherein, the heat exchanger tube single long length of several straight pipes is less than or equal to 30mm；The heat exchange of adjoining spiral winding pipeline section
Pipe winding direction is vertical each other.
Several described Combined baffle plates be arranged at straight pipe shell in and it is therein first and last
It is a to be welded to each other respectively with shell；The Combined baffle plate is made of the mutually interlocking of several veneers head and the tail；Described is straight
Pipeline section is through setting on Combined baffle plate.
The veneer includes plate body, and plate body two sides are respectively arranged with insertion section and slotted line；By embedding between adjacent veneer
The cooperation for entering section and slotted line is mutually rabbeted, wherein is clearance fit between insertion section and slotted line.
The insertion section setting is less than the thickness of plate body setting in plate body side, the thickness for being embedded in section setting, and insertion section is set
The depth set is greater than or equal to the diameter of semicircle embedded hole.
Slotted line setting is in the plate body other side and its end offers card slot；Wherein, card slot setting depth with it is embedding
The depth for entering section setting is identical, and the width of card slot setting is identical as the thickness of insertion section setting.
The insertion section end offers several semicircle embedded holes, and slotted line end offers several semicircle cards
Slot；Mutually rabbeted between adjacent veneer by the cooperation of insertion section and slotted line and passes through semicircle embedded hole and semicircle
Shape card slot hole forms through hole；The straight pipe is through setting on through hole.
The notch of certain area is formed between the Combined baffle plate and shell, the area of the notch should be less than or be equal to
The one third of diameter of the housing.
The radial section of the shell is round or oval or polygon.
By the improvement of above structure, the shell side for effectively overcoming traditional wound pipe heat exchanger is difficult to be arranged the present invention
Baffle plate causes the fluid heat transfer process of traditional wound pipe heat exchanger shorter, will appear flow velocity between same layer pipe network adjacent tubes
Region will cause flow dead zone between retention areas, especially filler strip and heat exchanger tube, and heat exchange efficiency is difficult to further increase, Er Qiehuan
Hot device overall heat exchange is uneven, and exchange capability of heat has a series of problems such as certain waste.
Compared with prior art, the method have the benefit that: can effectively, easily multistage spiral winding exchange heat
Baffle plate is installed on pipe, to effectively eliminate shell fluid flow dead zone, strengthens shell-side fluid disturbance, extends fluid heat transfer process, most
Strengthen shell-side heat transfer eventually, saves consumptive material and the energy, and improve heat exchanger overall heat exchange uniformity.
In terms of comprehensive, with it is simple and reasonable, have excellent performance, good effect of heat exchange, energy conservation and environmental protection, manufacturing cost are low,
The features such as easily realizing and be safe and reliable, it is practical.
Detailed description of the invention
Fig. 1 is the assembling structure schematic diagram of first embodiment of the invention.
Fig. 2 is the single plate structure schematic diagram of first embodiment of the invention.
Fig. 3 is the shell and baffle plate the first application examples assembling structure schematic diagram (section view) of first embodiment of the invention.
Fig. 4 is the shell and baffle plate another application example assembling structure schematic diagram (section view) of first embodiment of the invention.
Fig. 5 is the assembling structure schematic diagram of second embodiment of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments.
First embodiment
Referring to figures 1-4, this wrap-round tubular heat exchanger with baffle plate, including shell 4 are provided with multistage spiral shell in shell 4
Rotation winding heat exchanger tube 1, multistage spiral winding heat exchanger tube 1 is by several spiral winding pipeline sections 2 and several alternate coilings of straight pipe 3
It forms；Wherein, several Combined baffle plates 5 are respectively arranged between straight pipe 3 and shell 4, several Combined baffle plates 5
The axis along shell 4 is vertically arranged respectively；4 both ends of shell are also respectively provided with tube sheet 6 and pass through the tube sheet 6 at both ends
It is separated into tube side and shell side heat exchange area.
4 side of shell is provided with shell side import 10 and shell-side outlet 11, and end is provided with tube side import 8 and tube side outlet 9；
The tube side of evaporator walks evaporative fluid, and the shell side of evaporator walks heat exchanging fluid；The shell side is single process.
Axis of the heat exchanger tube of several straight pipes 3 respectively along shell 4 is arranged in parallel and forms rectangular tube row between each other
Arrangement；Wherein, the heat exchanger tube single long length of several straight pipes 3 is less than or equal to 30mm；The heat exchange of adjoining spiral winding pipeline section 2
Pipe winding direction is vertical each other.
Several Combined baffle plates 5 be arranged at straight pipe 3 shell 4 in and it is therein first and last
It is a to be welded to each other respectively with shell 4.
As shown in figs 2-4, Combined baffle plate 5 is made of several 7 head and the tail of veneer mutually interlockings；The straight pipe
3 run through setting on Combined baffle plate 5.
Veneer 7 includes plate body 71, and 71 two sides of plate body are respectively arranged with insertion section 72 and slotted line 73；Between adjacent veneer 7
Cooperation by being embedded in section 72 and slotted line 73 is mutually rabbeted.
To prevent the interlocking between adjacent veneer 7 from not relatively moving, while alsoing for reducing the evaporation stream by tube side
Vibration when body impacts is embedded between section 72 and slotted line 73 and is less than or equal to for the fit clearance of clearance fit and the two
2mm。
The setting of section 72 is embedded in 71 side of plate body, the thickness that section 72 is arranged is embedded in and is less than the thickness that plate body 71 is arranged, insertion
The depth of 72 setting of section is greater than or equal to the diameter of semicircle embedded hole 721.
The setting of slotted line 73 is in 71 other side of plate body and its end offers card slot 732；Wherein, the depth that card slot 732 is arranged
Degree is identical as the depth that insertion section 72 is arranged, and the width that card slot 732 is arranged is identical as the thickness of the insertion setting of section 72.
Insertion 72 end of section offers several semicircle embedded holes 721, and 73 end of slotted line offers several semicircles
Shape card slot hole 731；Mutually rabbet by the cooperation of insertion section 72 and slotted line 73 between adjacent veneer 7 and pass through semicircle
Embedded hole 721 and semicircle card slot hole 731 form through hole 74；The straight pipe 3 is through setting on through hole 74.
The notch 16 of certain area is formed between Combined baffle plate 5 and shell 4, the area of the notch 16 should be less than or wait
In the one third of 4 diameter of shell.
The radial section of shell 4 is round or oval or polygon.
As shown in figure 3, the radial section of shell 4 is rectangular.
As shown in figure 4, the radial section of shell 4 is circle.
The working principle of this heat exchanger is as follows:
The evaporative fluid of tube side from tube side import 8 enter multistage spiral winding heat exchanger tube 1, then with the heat exchanging fluid of shell side
It exchanges heat, finally from 9 outflow of tube side outlet；The heat exchanging fluid of shell side enters in heat exchanger shell 4 from shell side import 10, then
Horizontal spiral winding pipeline section 2 of plunderring is managed outer and is exchanged heat with the evaporative fluid of tube side, subsequently encounters the blocking of Combined baffle plate 5, shell
Notch 16 between baffle plate 5 and shell 4 enters next heat exchanging chamber and continues and revolve winding pipe after the heat exchanging fluid of journey is forced
Section 2 exchanges heat, fluid interchange repeatedly, until heat exchange terminates, the heat exchanging fluid of shell side is finally flowed out from shell-side outlet 11.Shell side
Heat exchanging fluid by the way that after 5 baffling of Combined baffle plate, flow velocity is accelerated, disturbance is strengthened, and due to the heat exchanging fluid stream of shell side
Existing longitudinal direction is moved, also there is transverse direction, effectively eliminates flow dead zone, and is effectively improved the uniformity of heat exchanger space heat exchange, is finally had
Imitate improving heat exchanging efficiency.
Second embodiment
Referring to Fig. 5, this wrap-round tubular heat exchanger with baffle plate, be different from being in place of first embodiment: shell side is
The multistage spiral winding heat exchanger tube 1 of multipaths and different processes is parallel to each other, and is not stacked.
The shell side of this example example is double-shell.Its multistage spiral winding heat exchanger tube 1 is by spiral winding pipeline section 2 and straight pipe 3
It constitutes, segmentation coiling forms, and straight pipe 3 is arranged between forward and backward spiral winding pipeline section 2, while heat exchanger is separated by both ends tube sheet 6
Tube side and shell side heat exchange area.Two beam multistage spiral winding heat exchanger tubes 1 parallel arrangement, is individually positioned in the shell side two sides being in U-shape,
Shell side partition 14 is set between two beam multistage spiral winding heat exchanger tubes 1, and two shell sides are by the company between shell side partition 14 and tube sheet 6
The connection of notch 13 is connect, Combined baffle plate 5 is arranged on 3 place shell 4 of straight pipe or shell side partition 14, and 4 end of shell is also
It is provided with end socket 12, tube side connecting cavity is provided between end socket 12 and tube sheet 6, is led between two beam multistage spiral winding heat exchanger tubes 1
Tube side connecting cavity is crossed to be attached.
The working principle of this heat exchanger is as follows:
The evaporative fluid of first tube side from tube side import 8 enter multistage spiral winding heat exchanger tube 1, then with the heat exchange of shell side
Fluid exchanges heat, and the multistage spiral winding heat exchanger tube 1 for subsequently entering tube side connecting cavity, and entering the second tube side continues and shell side
Heat exchanging fluid exchange heat, finally from tube side outlet 9 outflow；The heat exchanging fluid of first shell side enters from shell side import 10 to exchange heat
In the first pass shell 4 of device, the horizontal spiral winding pipeline section 2 of plunderring of subsequent fluid is managed outer and is exchanged heat with the evaporative fluid of tube side,
The blocking of Combined baffle plate 5 is subsequently encountered, the heat exchanging fluid of shell side is forced the entrance of the notch 16 between baffle plate 5 and shell 4
Next heat exchanging chamber continues to exchange heat with rotation winding pipeline section 2, fluid interchange repeatedly, until the heat exchange of the first shell side terminates, shell side
Connection breach 13 of the heat exchanging fluid between shell side partition 14 and tube sheet 6 enter next shell side, and repeat changing for first shell journey
Thermal process, until heat exchange terminates, the heat exchanging fluid of shell side is finally flowed out from shell-side outlet 11.
Other same first embodiments in not described part.
The drawings are for illustrative purposes only and are merely schematic diagrams, rather than pictorial diagram, should not be understood as to this patent
Limitation；Embodiment in order to better illustrate the present invention, the certain components of attached drawing have omission, zoom in or out, and do not represent real
The size of border product；It will be understood by those skilled in the art that it is that can manage that certain known features and its explanation, which may be omitted, in attached drawing
Solution.
Moreover, in the attached drawing of the embodiment of the present invention, the same or similar label correspond to the same or similar components；In this hair
In bright description, it is to be understood that if having term " on ", "lower", "left", "right", "vertical", "horizontal", " transverse direction ", " indulging
To ", "top", "bottom", "inner", the instructions such as "outside" orientation or positional relationship be based on orientation or positional relationship shown in the drawings,
Be merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only for illustration, no
It can be understood as a limitation of this patent.
Claims (10)
1. a kind of wrap-round tubular heat exchanger with baffle plate, including shell (4), it is characterised in that: be provided with multistage in shell (4)
Spiral winding heat exchanger tube (1), multistage spiral winding heat exchanger tube (1) is by several spiral winding pipeline sections (2) and several straight pipes
(3) alternate coiling forms；Wherein, several Combined baffle plates (5) are respectively arranged between straight pipe (3) and shell (4), if
A dry axis of the Combined baffle plate (5) respectively along shell (4) is vertically arranged；Described shell (4) both ends are also respectively provided with
Tube sheet (6) and tube side and shell side heat exchange area are separated by the tube sheet at both ends (6).
2. according to claim 1 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: shell (4) side is set
It is equipped with shell side import (10) and shell-side outlet (11), end is provided with tube side import (8) and tube side outlet (9)；The pipe of evaporator
Journey walks evaporative fluid, and the shell side of evaporator walks heat exchanging fluid；The shell side is single process, alternatively, shell side is multipaths and not
Multistage spiral winding heat exchanger tube (1) with process is parallel to each other, and is not stacked.
3. according to claim 1 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: several described straight pipes
(3) axis of the heat exchanger tube respectively along shell (4) it is arranged in parallel and between each other formed rectangular tube arrangement set；Wherein, several
The heat exchanger tube single long length of straight pipe (3) is less than or equal to 30mm；The heat exchanger tube winding direction that adjoining spiral winds pipeline section (2) is mutual
It is vertical.
4. according to claim 3 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: several combined types folding
In the shell (4) that flowing plate (5) setting is in straight pipe (3) and it is therein first and the last one respectively with shell (4) phase
Mutually welding；The Combined baffle plate (5) is made of the mutually interlocking of several veneers (7) head and the tail；The straight pipe (3) passes through
It wears and sets on Combined baffle plate (5).
5. according to claim 4 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: the veneer (7) includes plate
Body (71), plate body (71) two sides are respectively arranged with insertion section (72) and slotted line (73)；Pass through insertion section between adjacent veneer (7)
(72) mutually rabbet with the cooperation of slotted line (73), wherein be clearance fit between insertion section (72) and slotted line (73).
6. according to claim 5 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: insertion section (72) setting
In plate body (71) side, the thickness for being embedded in section (72) setting is less than the thickness of plate body (71) setting, the depth of insertion section (72) setting
Degree is greater than or equal to the diameter of semicircle embedded hole (721).
7. according to claim 6 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: slotted line (73) setting
In plate body (71) other side and its end offers card slot (732)；Wherein, the depth and insertion section (72) of card slot (732) setting
The depth of setting is identical, and the width of card slot (732) setting is identical as the thickness of insertion section (72) setting.
8. according to claim 7 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: insertion section (72) end
Several semicircle embedded holes (721) are offered, slotted line (73) end offers several semicircle card slot holes (731)；Phase
Mutually rabbeted between adjacent veneer (7) by the cooperation of insertion section (72) and slotted line (73) and passes through semicircle embedded hole
(721) and semicircle card slot hole (731) forms through hole (74)；The straight pipe (3) is through setting on through hole (74).
9. according to claim 1 with the wrap-round tubular heat exchanger of baffle plate, it is characterised in that: the Combined baffle plate
(5) notch (16) of certain area is formed between shell (4), the area of the notch (16) should be less than or be equal to shell (4) directly
The one third of diameter.
10. any one of -9 wrap-round tubular heat exchanger with baffle plate according to claim 1, it is characterised in that: the shell
(4) radial section is round or oval or polygon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910785735.2A CN110455098A (en) | 2019-08-23 | 2019-08-23 | Winding tube type heat exchanger with baffle plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910785735.2A CN110455098A (en) | 2019-08-23 | 2019-08-23 | Winding tube type heat exchanger with baffle plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110455098A true CN110455098A (en) | 2019-11-15 |
Family
ID=68488877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910785735.2A Pending CN110455098A (en) | 2019-08-23 | 2019-08-23 | Winding tube type heat exchanger with baffle plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110455098A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112665419A (en) * | 2020-12-25 | 2021-04-16 | 西安交通大学 | Direct-insertion filler strip type wound tube heat exchanger |
| CN114405413A (en) * | 2021-12-09 | 2022-04-29 | 西安航天华威化工生物工程有限公司 | Reaction device for producing maleic anhydride by n-butane method |
-
2019
- 2019-08-23 CN CN201910785735.2A patent/CN110455098A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112665419A (en) * | 2020-12-25 | 2021-04-16 | 西安交通大学 | Direct-insertion filler strip type wound tube heat exchanger |
| CN112665419B (en) * | 2020-12-25 | 2022-04-05 | 西安交通大学 | Direct-insertion filler strip type wound tube heat exchanger |
| CN114405413A (en) * | 2021-12-09 | 2022-04-29 | 西安航天华威化工生物工程有限公司 | Reaction device for producing maleic anhydride by n-butane method |
| CN114405413B (en) * | 2021-12-09 | 2023-04-28 | 西安航天华威化工生物工程有限公司 | Reaction device for producing maleic anhydride by n-butane method |
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