CN104772080B - A kind of oxidation of formaldehyde device - Google Patents
A kind of oxidation of formaldehyde device Download PDFInfo
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- CN104772080B CN104772080B CN201510128130.8A CN201510128130A CN104772080B CN 104772080 B CN104772080 B CN 104772080B CN 201510128130 A CN201510128130 A CN 201510128130A CN 104772080 B CN104772080 B CN 104772080B
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- heat exchanger
- exchanger tube
- tube
- oxidator
- oxidator housing
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Abstract
The invention discloses a kind of 12 ton above long-life oxidation of formaldehyde device, including oxidator housing, heat exchanger tube, silver-colored Catalytic Layer and expansion joint, the heat exchanger tube is located at the inside in oxidator housing stage casing to constitute shell-and-tube heat exchanger, the shell side of the shell-and-tube heat exchanger is used for the reaction mass that circulates, and tube side is used for the low-temperature receiver that circulates, and the water inlet and delivery port of heat exchanger tube stretch out hull outside, and collected respectively by collector pipe；The periphery of the upper end in the oxidator housing stage casing and one end of expansion joint are affixed, and the other end of expansion joint is then affixed so that the epimere of oxidator housing and stage casing be sealed with the ledge of oxidator housing；Heat exchanger tube water inlet and delivery port are located at the same side of oxidator housing, and at least curved end semicanal enclosed construction of first layer heat exchanger tube, and the semicanal enclosed construction is provided with steam outlet.Compact conformation small volume of the present invention can realize 12 ton Formaldehyde Productions, and solve the fatigue damage under hot environment between exchanger tubes and tubesheets.
Description
Technical field
The invention belongs to the oxidation of formaldehyde of chemical production technology and equipment technical field, more particularly, to Formaldehyde Production
Device.
Background technology
At present, silver-colored formaldehyde production is broadly divided into following unit operation, methanol evaporation element, oxidation reaction unit,
Formaldehyde absorption unit, tail gas treating unit.And main oxidation reactor is nucleus equipment in silver-colored formaldehyde production, oxidation of formaldehyde device
The reasonability of design structure and the quality of workmanship directly affect formaldehyde final product quality, consumption of raw materials and oxidator and use the longevity
Life.
At present, traditional structural formula ledge, catalyst case, quench zone composition.Quench zone is actually a heat exchanger, on
Directly laying copper mesh, catalyst are layered on copper mesh on tube sheet, catalyst layer are so shortened to the distance of quench zone, so that product
Yield is high, and acidity can be controlled in 100x10-6Below.But, existing oxidation of formaldehyde device still has problems with：Oxidation of formaldehyde
Device operating temperature is 620 ~ 650 DEG C, because thermal stress can cause the drawing crack of tube sheet and heat exchanger tube；Exchanger tubes and tubesheets are if it happens
Leakage, can cause the medium of tube side and shell side to converge, cause production accident；If annual production production more than 120,000 tons, traditional oxygen
The volume for changing device becomes big, as the equipment that transfinites, cause transport it is constant while, the increase of span reduces equipment in high temperature ring
Service life under border；Formaldehyde medium walks tube side, and recirculated cooling water walks shell side, and technique is unreasonable, and heat transfer effect is bad；Tube side is walked
Formaldehyde medium is run, and because whole tube sheet is present, resistance is big, and operation is uneconomical, and energy consumption is big；There is dry combustion method in upper perforated plate,
Situation is hardening cracked so as to cause tube sheet.
The content of the invention
Goal of the invention：For above-mentioned problem and defect, the invention provides a kind of 12 ton above long-life
Oxidation of formaldehyde device, compact conformation small volume can realize 12 ton Formaldehyde Productions, and solve heat exchanger tube and pipe under hot environment
Fatigue damage between plate.
Technical scheme：For achieving the above object, the present invention uses following technical scheme：It is more than a kind of 12 tons long
Life-span oxidation of formaldehyde device, including oxidator housing, heat exchanger tube, silver-colored Catalytic Layer and section are the expansion joint of " L " font, the oxidation
The stage casing of device housing is square, and epimere and hypomere are respectively ledge and discharging section；The heat exchanger tube is located at oxidator housing stage casing
Inside so as to constituting shell-and-tube heat exchanger, the shell side of the shell-and-tube heat exchanger is used for the reaction mass that circulates, and tube side is used to flow
Logical low-temperature receiver, and the water inlet and delivery port of heat exchanger tube stretch out hull outside, and collected respectively by collector pipe；The silver catalysis
Oxidant layer is fixed on the top of heat exchanger tube；The periphery of the upper end in the oxidator housing stage casing and one end of expansion joint are affixed, and swollen
Ledge of the other end of swollen section then with oxidator housing is affixed so as to which the epimere of oxidator housing and stage casing be sealed, and oxidator
The upper end in housing stage casing can be relatively movable with the epimere of oxidator housing；The heat exchanger tube be U-shape structure, heat exchanger tube water inlet and
Delivery port is located at the same side of oxidator housing, and at least curved end semicanal enclosed construction of first layer heat exchanger tube, and the semicanal
Enclosed construction is provided with steam outlet
Supported preferably, also including heat exchanger tube, the heat exchanger tube support includes bottom support and intermediate support plate, described
Intermediate support plate is provided with multiple perforation corresponding with heat exchanger tube, and the perforation is provided with the sleeve pipe matched with heat exchanger tube external diameter；Institute
Bottom support is stated to be located under intermediate support plate.
Preferably, the epimere and hypomere of the oxidator housing are cylinder type, and oxidator housing epimere is provided with thing
Expect import and gas distributor.
Preferably, the ledge outer wall of the oxidator shell is provided with cooling adjoining pipe.
Preferably, the heat exchanger tube is finned tube.
Preferably, the position of the heat exchanger tube through oxidator housing is arranged with support set.
Preferably, the superiors' heat exchanger tube is provided with copper mesh brace rod, the upper flat of the copper mesh brace rod, bottom
Provided with the groove matched with heat exchanger tube external diameter.
Preferably, the expansion joint only has setting in the side of oxidator housing.
Beneficial effect：Compared with prior art, the present invention has advantages below：（1）Novel oxidized device structure uses square,
Structure is set to become compacter；（2）Exchanger tubes and tubesheets are solved in the event of leaking, the medium of tube side and shell side can be caused to converge
The problem of；（3）The problem of solving to be only limited to 120,000 tons/year of yield in transport；（4）Solve that oxidator heat transfer effect is bad asks
Under topic, same heat exchange area, finned tube is more much less than common heat exchange tube, and production capacity is improved but equipment diminishes；（5）Solution
Certainly oxidator resistance is big, runs uneconomical, the problem of energy consumption is big；（6）Service life of equipment can increase to 10 years from 3 years.
Brief description of the drawings
Fig. 1 is the structural representation of oxidation of formaldehyde device of the present invention；
Fig. 2 is the structure enlarged diagram of expansion joint at A in Fig. 1；
Fig. 3 is the structure enlarged diagram of semicanal enclosed construction at B in Fig. 1；
The structure enlarged diagram that Fig. 4 supports for heat exchanger tube at C in Fig. 1；
Fig. 5 is the structure enlarged diagram at D in Fig. 1；
Fig. 6 is the structure enlarged diagram at E in Fig. 1；
Fig. 7 is the structural representation of copper mesh brace rod of the present invention；
Fig. 8 is the structural representation of oxidation of formaldehyde device in the prior art.
Wherein, ledge 1, stage casing 2, hypomere 3, heat exchanger tube 4, silver catalyst layer 5, manifold trunk 6, expansion joint 7, half duct occlusion knot
Structure 8, steam outlet 9, intermediate support plate 10, bottom support 11, sleeve pipe 12, support set 13, copper mesh brace rod 14, material inlet
15th, gas distributor 16, cooling adjoining pipe 17.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
The present invention rather than limitation the scope of the present invention, after the present invention has been read, those skilled in the art are each to the present invention's
The modification for planting the equivalent form of value falls within the application appended claims limited range.
As shown in Fig. 1~7, oxidation of formaldehyde device of the present invention, mainly include oxidator housing, heat exchanger tube, silver-colored Catalytic Layer,
Section supports for the expansion joint and heat exchanger tube of " L " font, wherein：
Oxidator housing is divided into three sections, the respectively ledge of epimere, the reaction in stage casing and the production of quench zone and hypomere
Thing collection section, and the stage casing of oxidator housing is square, rib heat exchanging pipe is U-shape structure, and is located at oxygen in matrix form level
Change the stage casing of device housing, and water inlet and delivery port are stretched out outside oxidator housing and in the same side, and then each is intake
Mouth and delivery port are collected by manifold trunk respectively.In addition, the heat exchanger tube support includes bottom support and intermediate support plate, it is described
Intermediate support plate is provided with multiple perforation corresponding with heat exchanger tube, and the perforation is provided with the sleeve pipe matched with heat exchanger tube external diameter, together
When oxidator housing on cylindrical support set is also installed through the position of heat exchanger tube.
Because the temperature of catalyst layer conversion zone is very high, 650 DEG C can be reached.The conversion zone and quench zone of oxidator housing
Between thermal expansion it is larger, therefore epimere and the weld in stage casing are easily caused weld fatigue damage when expanding inconsistent,
And then shorten service life.Preferably, the present invention is set between the epimere ledge of oxidator housing and stage casing upper end
Putting section is " expansion joints of L " fonts, the periphery of the upper end in oxidator housing stage casing and one end of expansion joint are affixed, and expansion joint
The other end it is then affixed so as to which the epimere of oxidator housing and stage casing be sealed with the ledge of oxidator housing, and oxidator housing
The upper end in stage casing can be relatively movable with the epimere of oxidator housing（As shown in Figure 2）.The expansion joint can be by stainless-steel sheet
Flanging is made, with some strength and suitable amount of deflection.It is more preferably preferred, only set this swollen in the side in square oxidator stage casing
Swollen section, therefore dislocation dilation movement only occurs in side, it is to avoid the uncertainty of expansion direction.If heat exchanger tube and cylinder
When the thermal expansion of body is inconsistent, cylinder board expansion is more than the expansion of heat exchanger tube, right side tube sheet（Oxidator right shell）Can be left
Right direction moves to compensate the thermal expansion of heat exchanger tube.
Inventor is in commissioning process, it was found that above row's heat exchanger tube, which most adds, is easily damaged, and is learnt by disassembling analysis：This is
Because the temperature of the reaction zone of oxidation of formaldehyde is more than 620 DEG C ~ 650 DEG C, long-term work at such high temperatures, close to silver catalysis
The evil of the working condition of row's rib heat exchanging pipe of oxidant layer quite is omited, and the operating mode of corresponding cylinder board is also that suitable evil is omited.
Under this operating mode, the quantity of steam that the finned tube moment of upper row produces is very big, and water shortage situation is thus likely to occur inside finned tube, from
And cause the dry combustion method of finned tube, it is therefore necessary to the steam quickly produced is drawn in time.Therefore, of the invention by the finned of most upper row
The water inlet and delivery port in the left side of heat exchanger tube are collected by manifold trunk, but the U-shaped pipe bent position on right side then uses half tubular construction,
So as to form large volume of sealing space, and steam outlet is set on the top of sealing space, it is fast by way of negative pressure
Speed extracts steam out, and unvaporized cooling water then flows out along return duct from the delivery port of heat exchanger tube, so as to avoid steam from being in
The dry combustion method of the circulating resistance, even heat exchanger tube of the cooling water of increase can not be discharged above pipe, and then extends making for finned tube
Use the life-span.
Supported as shown in figure 4, also including heat exchanger tube, the heat exchanger tube support includes bottom support and intermediate support plate, institute
Intermediate support plate is stated provided with multiple perforation corresponding with heat exchanger tube, and the perforation is provided with the set matched with fin heat exchange pipe external diameter
Pipe；The bottom support is located under intermediate support plate.As shown in fig. 7, recessed for the fixed band of the top erection of intermediate support plate
The copper mesh brace rod of groove.Because the copper mesh of silver catalyst layer will be laid on finned tube, but fin tube pitch is larger, is not enough to
Whole copper mesh is supported, copper mesh can be naturally drooped if not adding support, whole copper mesh is uneven, it is equal that catalyst is difficult to distribution
Even, so as to influence whole reaction effect, copper mesh is laid on finned tube, can effectively ensure the flatness of the whole plane of silver layer
And shorten catalysis oxidation to the time of quench zone.Therefore, copper mesh supporting plate is added on certain length according to the distance of finned tube
It is approximately a grid frame that can so make at the top of finned tube, copper mesh is laid above, copper mesh is just very smooth.Further change
Enter, the position of the heat exchanger tube through oxidator housing is also arranged with support set.
Further improve, will not be sent out under 650 DEG C of high temperature long-term works in order to avoid the stainless steel ledge of oxidator housing
Raw excessive deformation and burning problem, and stainless steel sensitization and crack damage, the present invention are provided with cooling companion in the outer wall of ledge
Pipe, reduces the temperature of the part, so as to improve the service life of equipment.
When rib heat exchanging pipe is installed, the steel pipe for support set is first welded at the corresponding perforation of oxidator housing, and
Place intermediate support plate vertically in stage casing simultaneously, then finned tube is inserted in the steel pipe of oxidator housing correspondence perforation, continued
Intermediate support plate is extended through, after all finned tubes are all put on, intermediate support plate is welded and fixed, continues push finned tube and passes through
The oxidator housing on opposite, and built-up welding at gap is sealed.Then copper mesh brace rod, the copper mesh are set up on the superiors' finned tube
The upper flat of brace rod, bottom is provided with the groove matched with heat exchanger tube external diameter, then folds silver catalyst copper mesh layers successively
Overlay is located at top.Preferably, on the right side of oxidator housing（Side i.e. residing for U heat exchange bending end）Perforation phase
Bigger to the aperture in left side, so that adjustment when facilitating heat exchanger tube through installation, the wall thickness of its corresponding support set equally is more
Greatly so as to be matched with perforation.
In summary, the following technique existed present invention mainly solves oxidation of formaldehyde device in silver-colored formaldehyde device and manufacture
Technological difficulties：
（1）The shell side of circulation cooling medium in the prior art is changed to the reaction mass that circulates, and tube side then circulates to cool down and is situated between
The mode of matter, greatly reduces the running resistance of oxidator, improves yield economy, reduces energy consumption.
（2）Using new square oxidator structure, make more compact structure, yield is bigger, while convenient transport, more have
Thermal expansion and the direction of cold events beneficial to the different parts of control oxidator, increase the service life.
（3）Finned tube is designed to U-shaped bend pipe, and delivery port and water inlet are stretched out outside housing, so as to completely avoid
The problem of occurring the mixing for the tube side and shell side material for leaking and causing due to heat exchanger tube or tube sheet；
（4）Half tubular-shaped structures are designed as to the bend loss of the superiors' rib heat exchanging pipe, steam can be quickly drawn, so as to
Prevent heat exchanger tube dry combustion method；There is provided expansion compensation for simultaneous oxidation device housing design L-type expansion joint, it is to avoid tube sheet expansion width
Degree it is inconsistent cause welding position damage and housing high-temperature fatigue damage；
（5）Also supported in addition by heat exchanger with pipe sleeve, so as to improve the intensity of heat exchanger tube, it is to avoid due to heat exchanger tube across
Spend the deformation for causing heat exchanger tube greatly.
Claims (8)
1. a kind of 12 ton above long-life oxidation of formaldehyde device, it is characterised in that：Urged including oxidator housing, heat exchanger tube, silver
Change the expansion joint that layer and section are " L " font, the stage casing of the oxidator housing be it is square, epimere and hypomere be respectively ledge and
Discharging section；The heat exchanger tube is located at the inside in oxidator housing stage casing to constitute shell-and-tube heat exchanger, the shell-and-tube heat exchanger
Shell side be used to circulate reaction mass, and tube side is used for the low-temperature receiver that circulates, and the water inlet and delivery port of heat exchanger tube stretch out housing
Outside, and collected respectively by collector pipe；The silver catalyst layer is fixed on the top of heat exchanger tube；The oxidator housing stage casing
Upper end periphery and expansion joint one end it is affixed, and the other end of expansion joint is then affixed so as to will with the ledge of oxidator housing
The epimere of oxidator housing and stage casing are sealed, and the upper end in oxidator housing stage casing can be lived relatively with the epimere of oxidator housing
It is dynamic；The heat exchanger tube is U-shape structure, and heat exchanger tube water inlet and delivery port are located at the same side of oxidator housing, and at least first
The curved end semicanal enclosed construction of layer heat exchanger tube, and the semicanal enclosed construction is provided with steam outlet；The bending of the heat exchanger tube
End is stretched out outside oxidator housing.
2. oxidation of formaldehyde device according to claim 1, it is characterised in that：Also include heat exchanger tube to support, the heat exchanger tube support
Including bottom support and intermediate support plate, the intermediate support plate is provided with multiple perforation corresponding with heat exchanger tube, and in the perforation
Provided with the sleeve pipe matched with heat exchanger tube external diameter；The bottom support is located under intermediate support plate.
3. oxidation of formaldehyde device according to claim 1, it is characterised in that：The epimere and hypomere of the oxidator housing are circle
Cartridge type, and oxidator housing epimere is provided with material inlet and gas distributor.
4. oxidation of formaldehyde device according to claim 1, it is characterised in that：The ledge outer wall of the oxidator housing is provided with cooling
Adjoining pipe.
5. oxidation of formaldehyde device according to claim 1, it is characterised in that：The heat exchanger tube is finned tube.
6. oxidation of formaldehyde device according to claim 1, it is characterised in that：The heat exchanger tube covers through the position of oxidator housing
Provided with support set.
7. oxidation of formaldehyde device according to claim 1, it is characterised in that：The superiors' heat exchanger tube is provided with copper mesh brace rod, should
The upper flat of copper mesh brace rod, bottom is provided with the groove matched with heat exchanger tube external diameter.
8. oxidation of formaldehyde device according to claim 1, it is characterised in that：The expansion joint only has in the side of oxidator housing
Set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510128130.8A CN104772080B (en) | 2015-03-24 | 2015-03-24 | A kind of oxidation of formaldehyde device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510128130.8A CN104772080B (en) | 2015-03-24 | 2015-03-24 | A kind of oxidation of formaldehyde device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104772080A CN104772080A (en) | 2015-07-15 |
| CN104772080B true CN104772080B (en) | 2017-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510128130.8A Expired - Fee Related CN104772080B (en) | 2015-03-24 | 2015-03-24 | A kind of oxidation of formaldehyde device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737663B (en) * | 2016-04-29 | 2018-09-14 | 华南理工大学 | A kind of teflon heat exchanger single tube support construction |
| CN106237935A (en) * | 2016-08-19 | 2016-12-21 | 无锡市华立石化工程有限公司 | The fixing reaction bed of the novel oxidator of methanol without tube sheet |
| CN106123642A (en) * | 2016-08-19 | 2016-11-16 | 无锡市华立石化工程有限公司 | The heat-exchange system of the novel oxidator of methanol without tube sheet |
| CN110252209A (en) * | 2019-07-23 | 2019-09-20 | 江苏永大化工设备有限公司 | A kind of efficient formaldehyde oxidator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202013120U (en) * | 2011-05-19 | 2011-10-19 | 常州亚邦化学有限公司 | U-shaped fin type heat exchanger |
| CN104190327A (en) * | 2014-08-27 | 2014-12-10 | 江苏凯茂石化科技有限公司 | Novel formaldehyde oxidation reaction device |
| CN204115529U (en) * | 2014-08-20 | 2015-01-21 | 冯喜旺 | A kind of new steel structure tubular heat exchanger |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201245578Y (en) * | 2008-08-01 | 2009-05-27 | 谭文斌 | Formaldehyde reactor with floating tube sheet structure |
| CN103785334A (en) * | 2012-11-02 | 2014-05-14 | 河北化大科技有限公司 | Large fluidized bed reactor |
| CN204952857U (en) * | 2015-03-24 | 2016-01-13 | 江苏凯茂石化科技有限公司 | 12 long -life formaldehyde oxidizer more than ten thousand tonnes |
-
2015
- 2015-03-24 CN CN201510128130.8A patent/CN104772080B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202013120U (en) * | 2011-05-19 | 2011-10-19 | 常州亚邦化学有限公司 | U-shaped fin type heat exchanger |
| CN204115529U (en) * | 2014-08-20 | 2015-01-21 | 冯喜旺 | A kind of new steel structure tubular heat exchanger |
| CN104190327A (en) * | 2014-08-27 | 2014-12-10 | 江苏凯茂石化科技有限公司 | Novel formaldehyde oxidation reaction device |
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| CN104772080A (en) | 2015-07-15 |
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Granted publication date: 20171031 Termination date: 20180324 |