CN102584549A - Process and evaporator for preparing raw material gas in methanal production - Google Patents
Process and evaporator for preparing raw material gas in methanal production Download PDFInfo
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- CN102584549A CN102584549A CN2011104551688A CN201110455168A CN102584549A CN 102584549 A CN102584549 A CN 102584549A CN 2011104551688 A CN2011104551688 A CN 2011104551688A CN 201110455168 A CN201110455168 A CN 201110455168A CN 102584549 A CN102584549 A CN 102584549A
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Abstract
The invention relates to a process and equipment for preparing raw material gas in methanal production, in particular to a process and equipment for preparing methanal raw material gas, which fulfills the aims of reducing systemic resistance and recycling waste heat of devices further by improving the structure and heat exchange process of the conventional central circulating tube evaporator. A layer of filling is arranged on a pipe plate on a tube nest of an evaporator; methanol and water are added into the evaporator in a ratio, and a liquid level is controlled to be below an air inlet; methanal circulating liquid of a first absorption tower enters a shell pass of the tube nest of the evaporator and is cooled in a heat exchanger; a methanol aqueous solution is pumped out of the bottom of the evaporator by using a circulating pump of the evaporator, is heated in a cooling section on the lower part of an oxidator and is sprayed above the filling; and air passes through a tube pass of the tube nest and the filler and contacts the methanol aqueous solution reversely to form mixed gas of methanol-air-water vapor. The process and the evaporator have the advantages of power conservation, water conservation and large amount of water vapor serving as a byproduct.
Description
Technical field
The present invention relates to virgin gas preparation technology and equipment in the Formaldehyde Production, especially a kind of through improving formaldehyde virgin gas preparation technology and the equipment that existing evaporator with central downcomer structure and heat exchange process reach reduction SR, further recycle device used heat.
Background technology
At present, domestic most Formaldehyde Production adopts conventional silver method technology.The vaporizer of conventional silver method technology is an evaporator with central downcomer, leans on air bubbling hot methanol to produce the methanol-air gas mixture, and the extra again batching water vapour of allocating into forms three-element mixed gas, as the virgin gas of Formaldehyde Production.The thermal source of evaporation methyl alcohol is generally the hot water of the cooling section generation of oxidizer hypomere, and the heat of hot water just enough evaporates methyl alcohol, not residue.The shortcoming of this technology and equipment is: air need pass liquid layer, and SR is big, and blower fan current consumption is big; Must consume batching water vapour, device by-product steam vapour amount is little; The used heat of absorption system does not effectively utilize, and needs to consume a large amount of water quench.
In addition, also have a small amount of Formaldehyde Production to adopt tail gas or stack gas circulation technology.This process using gas blower is circulated back to reactor drum with the stack gas that formaldehyde absorbs tail gas or tail gas boiler, and instead of part batching water vapour has been practiced thrift a part of water vapour.But increased power consumption because of increasing recirculation blower; Methanol evaporator is a reboiler formula vaporizer, and evaporation has consumed a large amount of water vapour as thermal source to adopt water vapor; The stack gas circulation has reduced the combustible gas concentration in the tail gas, has reduced the thermo-efficiency of tail gas stove.
Summary of the invention:
The objective of the invention is to solve the shortcoming and deficiency that above-mentioned technology exists, provide a kind of to the evaporator with central downcomer in the existing apparatus and the modification scheme of reboiler formula vaporizer, and the technical process and the working method of corresponding new vaporizer.
A kind of vaporizer of Formaldehyde Production virgin gas, described vaporizer is the evaporator with central downcomer after improving; Wherein, central circulating tube is suitable for reading blind dead; On base of evaporator or methanol inlet pipeline, increase by a water supplement port; On the tubulation section and/or below the increase filler, perhaps do not have the tubulation section to have only packing section, above packing section, be provided with sparger; And on the vaporizer top material filling type foam removal section is set and substitutes baffle plate type foam removal section.Can be chosen in and add a scrubber tower or gas washing section before the vaporizer again to improve the cleanliness factor of virgin gas.
A kind of virgin gas device that is used for Formaldehyde Production comprises vaporizer, vaporizer recycle pump, strainer, oxidizer cooling section, first absorption tower, the first absorption tower interchanger, formaldehyde recycle pump;
The bottom liquid outlet of said vaporizer is connected with strainer through the vaporizer recycle pump; Said strainer is connected through the fluid inlet of oxidizer cooling section with vaporizer packing section top;
Lower end, said first absorption tower links to each other with vaporizer tubulation section shell side fluid inlet through the formaldehyde recycle pump; Upper end, said first absorption tower links to each other with vaporizer tubulation section shell side liquid outlet through interchanger.
Said vaporizer is an evaporator with central downcomer, and it is provided with central circulating tube, tubulation section, packing section, foam removal section and air, methyl alcohol, three inlets of moisturizing; Be provided with central circulating tube and tubulation section at the vaporizer middle part, central circulating tube is suitable for reading blind dead; On the tubulation section and/or below packing section is set, above packing section, be provided with sparger; And the foam removal section being set on the vaporizer top, said foam removal section is a material filling type; Said vaporizer bottom is provided with air or air Mixture, methyl alcohol and three inlets of moisturizing.
The outside of said vaporizer is established an air scrubber in addition, establishes a gas inlet in the air scrubber bottom; Air scrubber is established external heat exchanger.
Said vaporizer is the packing tower structure; It is provided with packing section, foam removal section and air, methyl alcohol, three inlets of moisturizing; Be provided with packing section at the vaporizer middle part, above packing section, be provided with sparger; And the foam removal section is set on the vaporizer top; Be provided with air, methyl alcohol and three inlets of moisturizing in the vaporizer bottom.
Said vaporizer outside is established an air scrubber in addition, establishes a gas inlet in the air scrubber bottom; Air scrubber is established external heat exchanger.
A kind of preparation technology of Formaldehyde Production virgin gas comprises the steps:
Step 1: add the first alcohol and water in proportion simultaneously in the vaporizer, liquid level is controlled at below the air;
Step 2: the first absorption tower bottom blowing of driving forward direction is gone into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stops after the driving steaming out;
Step 3: the formaldehyde circulation fluid on first absorption tower gets into vaporizer tubulation section shell side successively, gets into the water cooler cooling on first absorption tower again;
Step 4: the first alcohol and water forms methanol aqueous solution in the base of evaporator mixing, after strainer filters, gets into the oxidizer cooling section with the extraction of vaporizer recycle pump and heats, and returns the filler top and sprays;
Step 5: air or the air that contains the methanol-water steam pass tubulation section tube side, packing section and the methanol aqueous solution liquid film is reverse contacts, and forms methanol-air-water vapour gas mixture.
Wherein before said step 4, increase by a step:
Be provided with air scrubber in the vaporizer outside, methanol aqueous solution returns filler top spray through the external heat exchanger and the heat exchange of formaldehyde circulation fluid of air scrubber; Air gets into from the air scrubber bottom, through packing section with come flash-pot and, wash airborne impurity off, and formation contain the air of methanol-water steam reverse contact of methanol aqueous solution liquid film of air scrubber internal recycle; The air air from vaporizer after the foam removal of foam removal section that contains the methanol-water steam gets into vaporizer.
Wherein go into water vapour preheating formaldehyde circulation fluid in order to heating fumigators and air scrubber, stop after the driving steaming out in the first absorption tower bottom blowing of driving forward direction.
In the wherein said step 3, vaporizer is not provided with the tubulation section, and then the formaldehyde circulation fluid on first absorption tower is introduced into the air scrubber external heat exchanger, gets into the interchanger cooling on first absorption tower again.
Wherein said step 5 air or the air that contains the methanol-water steam pass packing section and contact with the methanol aqueous solution liquid film is reverse, form methanol-air-water vapour gas mixture.
Wherein said water is clear water or contains methyl alcohol and/or the aqueous solution of formaldehyde.
On the wherein said vaporizer methanol solution circulation line strainer is set.
The central circulating tube of wherein said vaporizer is suitable for reading to be blind dead.
Above the tubulation section of wherein said vaporizer and/or following increase packing section, perhaps do not have the tubulation section to have only packing section, the packing section top is provided with sparger.
The foam removal section is set in the wherein said vaporizer, and described foam removal section is a material filling type.
The invention has the beneficial effects as follows, formaldehyde virgin gas preparation technology of the present invention, traditional technology, equipment are changed very little, transform drop into low; SR is little, and blower fan current consumption is little; No longer consume the evaporation of batching water vapour and methyl alcohol and use water vapour, device by-product steam vapour amount is big; The used heat of absorption system is effectively used, and saves a large amount of water coolants.
Description of drawings
Fig. 1 is apparatus of the present invention figure;
Fig. 2 is a process flow sheet of the present invention;
Fig. 3 is located at the process flow sheet on vaporizer next door for air scrubber;
Fig. 4 is located at the process flow sheet of vaporizer below for air scrubber;
Fig. 5 is located at the another kind of process flow sheet on vaporizer next door for air scrubber;
Among the figure: 1. the external heat exchanger 18. air Mixture imports of foam removal section 15. air scrubber circulating pumps 16. air scrubber filters 17. air scrubbers of packing section 14. air scrubbers of heat exchanger 12. air scrubbers 13. air scrubbers on 10. formaldehyde circulating pumps, 11. first absorption towers, evaporimeter 2. tubulation sections, 3. central circulating tube 4. packing section, 5. foam removal section 6. oxidator cooling sections, 7. filter 8. evaporimeter circulating pumps, 9. first absorption towers.
Embodiment
Combine accompanying drawing and preferred embodiment that the present invention is done further detailed explanation now.The synoptic diagram of this accompanying drawing for simplifying typical process flow of the present invention and device structure only are described in a schematic way, so it only shows the formation relevant with the present invention.
Embodiment 1 (vaporizer is provided with improved central circulating tube and tubulation section, and moisturizing is softening water or de-salted water)
A kind of virgin gas device that is used for Formaldehyde Production, as shown in Figure 1, comprise interchanger 11, first absorption tower 9, the formaldehyde recycle pump 10 on vaporizer 1, vaporizer recycle pump 8, strainer 7, oxidizer 6 cooling sections, first absorption tower; Methanol aqueous solution is extracted out with the vaporizer recycle pump from base of evaporator and after strainer filters, is got into the oxidizer heating, returns packing section top spray; Air passes the tubulation section and contacts with the methanol aqueous solution liquid film is reverse with packing section, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer after the foam removal section; The formaldehyde circulation fluid on first absorption tower is extracted the methanol aqueous solution that gets in the vaporizer tubulation section heating fumigators out with the formaldehyde recycle pump, gets into the first absorption tower interchanger cooling again.
Said vaporizer is an evaporator with central downcomer, and it is provided with central circulating tube 3, tubulation section 2, packing section 4, foam removal section 5; Be provided with central circulating tube and tubulation section at the vaporizer middle part, central circulating tube is suitable for reading blind dead; On the tubulation section and/or below packing section is set, above packing section, be provided with sparger; And the foam removal section being set on the vaporizer top, said foam removal section is a material filling type.Above-mentioned vaporizer bottom can be provided with air, methyl alcohol and three inlets of moisturizing.
Central circulating tube 3 upper ends are blind dead; Softening water or de-salted water are linked to each other with the water supplement port of vaporizer 1 bottom; On tubulation section 2, increase filler, above filler, be provided with sparger; And on the vaporizer top material filling type foam removal section is set and substitutes baffle plate type foam removal section; The formaldehyde circulation fluid on first absorption tower 9 is connected vaporizer tubulation section 2 shell sides earlier, insert original interchanger cooling again; Remove the hot water tank system, change into methanol aqueous solution from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section 6 → packing section 4 tops spray; In 9 bottoms, first absorption tower, set up steam and add pipeline.
As shown in Figure 2, add methyl alcohol and clear water in proportion simultaneously in the vaporizer 1, liquid level is controlled at below the air; 9 bottoms, driving forward direction first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stop after the driving steaming out; The formaldehyde circulation fluid on first absorption tower 9 is extracted the methanol aqueous solution that gets in the vaporizer tubulation section 2 shell side heating fumigators 1 out with formaldehyde recycle pump 10, gets into 11 coolings of the first absorption tower interchanger again; Methanol aqueous solution is extracted entering oxidizer cooling section 6 heating after strainer 7 filters out from vaporizer 1 bottom with recycle pump 8, returns filler 4 tops spray; Air passes tubulation section 2 tube sides and contacts with the methanol aqueous solution liquid film is reverse with filler 4, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
With 50,000 tons of/year formaldehyde plants, formaldehyde output 7t/h is an example, production effect before and after contrast is transformed:
Embodiment 2 (vaporizer is provided with central circulating tube and tubulation section, and moisturizing is methyl alcohol and formaldehyde absorbing tower washing section dilute methanol solution)
Device is with embodiment 1, and central circulating tube 3 upper ends are blind dead; The dilute methanol solution that methanal absorbing system is terminal links to each other with the water supplement port of vaporizer 1 bottom; On tubulation section 2, increase filler, above filler, be provided with sparger; And on the vaporizer top material filling type foam removal section is set and substitutes baffle plate type foam removal section; The formaldehyde circulation fluid on first absorption tower 9 is connected vaporizer tubulation section 2 shell sides earlier, insert original interchanger cooling again; Remove the hot water tank system, change into methanol aqueous solution from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section 6 → packing section 4 tops spray; In 9 bottoms, first absorption tower, set up steam and add pipeline.
Simultaneously add methyl alcohol and formaldehyde absorbing tower washing section dilute methanol solution in proportion in the vaporizer 1, liquid level is controlled at below the air; 9 bottoms, driving forward direction first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stop after the driving steaming out; The formaldehyde circulation fluid on first absorption tower 9 is extracted the methanol aqueous solution that gets in the vaporizer tubulation section 2 shell side heating fumigators 1 out with formaldehyde recycle pump 10, gets into 11 coolings of the first absorption tower interchanger again; Methanol aqueous solution is extracted entering oxidizer cooling section 6 heating after strainer 7 filters out from vaporizer 1 bottom with recycle pump 8, returns packing section 4 tops spray; Air passes tubulation section 2 tube sides and contacts with the methanol aqueous solution liquid film is reverse with packing section 4, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
Contain methanol in water to the vaporizer adding and can reduce the methyl alcohol unit consumption.Above-mentioned contain methanol in water and also can replace with the aqueous solution that contains methyl alcohol and formaldehyde.
With 50,000 tons of/year formaldehyde plants, formaldehyde output 7t/h is an example, production effect before and after contrast is transformed:
Embodiment 3 (vaporizer: the packing tower structure do not have central circulating tube and tubulation section, and the vaporizer next door is provided with air scrubber)
Adopt the virgin gas of air scrubber 12 on vaporizer 1 next door to prepare equipment, gas inlet is located at the air scrubber bottom, and the gas inlet after the washing, methanol inlet, water supplement port are located at the vaporizer bottom, and clear water is linked to each other with this water supplement port; The air scrubber mixed gas outlet links to each other with the evaporator air inlet; The air washing tower bottom links to each other with base of evaporator; The air scrubber middle part is a packing section 13, above packing section, is provided with sparger; And material filling type foam removal section 14 is set on the air scrubber top; The vaporizer middle part is a packing section, above packing section, is provided with sparger; And material filling type foam removal section is set on the vaporizer top; Be provided with plate-type heat exchanger 17 in the air scrubber outside,, insert the first absorption tower interchanger cooling again the external plate-type heat exchanger of formaldehyde circulation fluid elder generation access air scrubber on first absorption tower 9; The air scrubber methanol aqueous solution is from air washing tower bottom → air scrubber recycle pump 15 → air scrubber strainer 16 → air scrubber external heat exchanger 17 → air scrubber packing section 13 tops spray; The vaporizer methanol aqueous solution from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section → packing section 4 tops sprays; In 9 bottoms, first absorption tower, set up steam and add pipeline.
As shown in Figure 3, add methyl alcohol and clear water in proportion simultaneously in the vaporizer 1, because of air scrubber links to each other with base of evaporator, so both liquid levels are basic identical, control air washing tower liquid level is below air; 9 bottoms, driving forward direction first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to the methanol solution in the heating air scrubber, stop after the driving steaming out; The formaldehyde circulation fluid on first absorption tower 9 is extracted out with formaldehyde recycle pump 10 and is introduced into the external plate-type heat exchanger heating methanol of the air scrubber aqueous solution, gets into 11 coolings of the first absorption tower interchanger again; Methanol aqueous solution is extracted out with the air scrubber recycle pump from the air washing tower bottom and after strainer filters, is got into the external plate-type heat exchanger heating of air scrubber, returns filler top spray; Air passes filler and contacts with the methanol aqueous solution liquid film is reverse, forms the air that contains the methanol-water steam; The air air from vaporizer 1 after the foam removal of foam removal section that contains the methanol-water steam gets into vaporizer 1; Methanol aqueous solution is extracted entering oxidizer cooling section heating after strainer 7 filters out from vaporizer 1 bottom with vaporizer recycle pump 8, returns filler 4 tops spray; The air that contains methyl alcohol, water vapour passes filler 4 and contacts with the methanol aqueous solution liquid film is reverse, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
Air scrubber is set washes impurity such as koniology off, can reduce the methyl alcohol unit consumption.
With 50,000 tons of/year formaldehyde plants, formaldehyde output 7t/h is an example, production effect before and after contrast is transformed:
Embodiment 4 (vaporizer: the packing tower structure do not have central circulating tube and tubulation section, and the vaporizer below is provided with air scrubber)
Adopt the virgin gas of air scrubber below vaporizer to prepare equipment; Gas inlet is located at the air scrubber bottom; Gas inlet after the washing, methanol inlet, water supplement port are located at the vaporizer bottom, and formaldehyde absorbing tower washing section dilute methanol solution is linked to each other with this water supplement port; The air scrubber middle part is a filler, above filler, is provided with sparger; And material filling type foam removal section is set on the air scrubber top; The vaporizer middle part is a filler, above filler, is provided with sparger; And material filling type foam removal section 5 is set on the vaporizer top; Be provided with plate-type heat exchanger 17 in the air scrubber outside,, insert the first absorption tower interchanger cooling again the external plate-type heat exchanger 17 of formaldehyde circulation fluid elder generation connection air scrubber on first absorption tower 9; The air scrubber methanol aqueous solution is from air washing tower bottom → air scrubber recycle pump 15 → air scrubber strainer 16 → air scrubber interchanger 17 → air scrubber packing section 13 tops spray; The evaporator section methanol aqueous solution from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section → packing section 4 tops sprays; In 9 bottoms, first absorption tower, set up steam and add pipeline.
As shown in Figure 4, add the methyl alcohol and the formaldehyde absorbing tower washing section dilute methanol solution of air scrubber in the vaporizer 1 simultaneously in proportion, liquid level reaches after the requirement for height to following air scrubber overflow, and control air washing tower liquid level is below air; 9 bottoms, driving forward direction first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to the heating air scrubber, stop after the driving steaming out; The formaldehyde circulation fluid on first absorption tower 9 is extracted out with formaldehyde recycle pump 10 and is got into the external plate-type heat exchanger heating methanol of the air scrubber aqueous solution, gets into 11 coolings of the first absorption tower interchanger again; Methanol aqueous solution is extracted out with the air scrubber recycle pump from the air washing tower bottom and after strainer filters, is got into the external plate-type heat exchanger heating of air scrubber, returns packing section top spray; Air gets into from the air scrubber bottom and passes packing section and contact with the methanol aqueous solution liquid film is reverse, and formation contains the air of methanol-water steam; The air Mixture air Mixture import 18 from vaporizer 1 after the foam removal of foam removal section that contains the methanol-water steam gets into vaporizer 1; Methanol aqueous solution is extracted entering oxidizer tubulation section heating after strainer 7 filters out from vaporizer 1 bottom with recycle pump 8, returns filler 4 tops spray; Air passes filler 4 and contacts with the methanol aqueous solution liquid film is reverse, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
Air scrubber is set washes impurity such as koniology off, can reduce the methyl alcohol unit consumption.Contain methanol in water to the vaporizer adding and can reduce the methyl alcohol unit consumption.Above-mentioned contain methanol in water and also can replace with the aqueous solution that contains methyl alcohol and formaldehyde.
With 50,000 tons of/year formaldehyde plants, formaldehyde output 7t/h is an example, production effect before and after contrast is transformed:
Embodiment 5 (vaporizer is provided with central circulating tube and tubulation section, and the vaporizer next door is provided with air scrubber)
Adopt air scrubber to prepare equipment at the virgin gas on vaporizer next door, gas inlet is located at the air scrubber bottom, and the gas inlet after the washing, methanol inlet, water supplement port are located at the vaporizer bottom, and clear water is linked to each other with this water supplement port; The air scrubber mixed gas outlet links to each other with the evaporator air inlet; The air washing tower bottom links to each other with base of evaporator; The air scrubber middle part is a filler, above filler, is provided with sparger; And material filling type foam removal section is set on the air scrubber top; The vaporizer middle part is provided with central circulating tube and tubulation section, and central circulating tube is suitable for reading blind dead; On the tubulation section and/or below packing section is set, above filler, be provided with sparger; And material filling type foam removal section is set on the vaporizer top; Be provided with plate-type heat exchanger in the air scrubber outside, the formaldehyde circulation fluid elder generation connection vaporizer tubulation section with first absorption tower 9 inserts the external plate-type heat exchanger of air scrubber again, inserts the first absorption tower interchanger cooling at last; The air scrubber methanol aqueous solution is from air washing tower bottom → air scrubber recycle pump 15 → air scrubber strainer 16 → air scrubber interchanger 17 → air scrubber packing section 13 tops spray; The evaporator section methanol aqueous solution from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section → packing section 4 tops sprays; In 9 bottoms, first absorption tower, set up steam and add pipeline.
As shown in Figure 5, add methyl alcohol and clear water in proportion simultaneously in the vaporizer 1, because of air scrubber links to each other with base of evaporator, so both liquid levels are basic identical, control air washing tower liquid level is below air; 9 bottoms, driving forward direction first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stop after the driving steaming out; The formaldehyde circulation fluid on first absorption tower 9 is extracted out with formaldehyde recycle pump 10 and is got into the vaporizer tubulation section heating methanol aqueous solution, gets into the external plate-type heat exchanger heating methanol of the air scrubber aqueous solution again, gets into 11 coolings of the first absorption tower interchanger at last; Methanol aqueous solution is extracted out with the air scrubber recycle pump from the air washing tower bottom and after strainer filters, is got into the external plate-type heat exchanger heating of air scrubber, returns filler top spray; Air passes filler and contacts with the methanol aqueous solution liquid film is reverse, forms the air that contains the methanol-water steam; The air air from vaporizer 1 after the foam removal of foam removal section that contains the methanol-water steam gets into vaporizer 1; Methanol aqueous solution is extracted entering oxidizer cooling section heating after strainer 7 filters out from vaporizer 1 bottom with vaporizer recycle pump 8, returns filler 4 tops spray; The air that contains the methanol-water steam passes the tubulation section and contacts with the methanol aqueous solution liquid film is reverse with filler 4, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
Air scrubber is set washes impurity such as koniology off, can reduce the methyl alcohol unit consumption.
With 50,000 tons of/year formaldehyde plants, formaldehyde output 7t/h is an example, production effect before and after contrast is transformed:
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention.All within principle of the present invention and spirit, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a virgin gas device that is used for Formaldehyde Production is characterized in that, comprises vaporizer, vaporizer recycle pump, strainer, oxidizer cooling section, first absorption tower, the first absorption tower interchanger, formaldehyde recycle pump;
The bottom liquid outlet of said vaporizer is connected with strainer through the vaporizer recycle pump; Said strainer is connected through the fluid inlet of oxidizer cooling section with vaporizer packing section top;
Lower end, said first absorption tower links to each other with vaporizer tubulation section shell side fluid inlet through the formaldehyde recycle pump; Upper end, said first absorption tower links to each other with vaporizer tubulation section shell side liquid outlet through interchanger.
2. virgin gas device according to claim 1, wherein, said vaporizer is an evaporator with central downcomer, it is provided with central circulating tube, tubulation section, packing section, foam removal section and air, methyl alcohol, three inlets of moisturizing; Be provided with central circulating tube and tubulation section at the vaporizer middle part, central circulating tube is suitable for reading blind dead; On the tubulation section and/or below packing section is set, above packing section, be provided with sparger; And the foam removal section is set on the vaporizer top; Said vaporizer bottom is provided with air or air Mixture, methyl alcohol and three inlets of moisturizing.
3. virgin gas device according to claim 2, wherein, the outside of said vaporizer is established an air scrubber in addition, establishes a gas inlet in the air scrubber bottom; Air scrubber is established external heat exchanger.
4. virgin gas device according to claim 1, wherein, said vaporizer is the packing tower structure; It is provided with packing section, foam removal section and air, methyl alcohol, three inlets of moisturizing; Be provided with packing section at the vaporizer middle part, above packing section, be provided with sparger; And the foam removal section is set on the vaporizer top; Be provided with air, methyl alcohol and three inlets of moisturizing in the vaporizer bottom.
5. virgin gas device according to claim 4, wherein, said vaporizer outside is established an air scrubber in addition, establishes a gas inlet in the air scrubber bottom; Air scrubber is established external heat exchanger.
6. the preparation technology of a Formaldehyde Production virgin gas is characterized in that, comprises the steps:
Step 1: add the first alcohol and water in proportion simultaneously in the vaporizer, liquid level is controlled at below the air;
Step 2: the first absorption tower bottom blowing of driving forward direction is gone into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stops after the driving steaming out;
Step 3: the formaldehyde circulation fluid on first absorption tower gets into vaporizer tubulation section shell side successively, gets into the water cooler cooling on first absorption tower again;
Step 4: the first alcohol and water forms methanol aqueous solution in the base of evaporator mixing, after strainer filters, gets into the oxidizer cooling section with the extraction of vaporizer recycle pump and heats, and returns the filler top and sprays;
Step 5: air or the air that contains the methanol-water steam pass tubulation section tube side, packing section and the methanol aqueous solution liquid film is reverse contacts, and forms methanol-air-water vapour gas mixture.
7. the preparation technology of virgin gas according to claim 6 wherein increased by a step before said step 4:
Be provided with air scrubber in the vaporizer outside, methanol aqueous solution returns filler top spray through the external heat exchanger and the heat exchange of formaldehyde circulation fluid of air scrubber; Air gets into from the air scrubber bottom, through packing section with come flash-pot and, wash airborne impurity off, and formation contain the air of methanol-water steam reverse contact of methanol aqueous solution liquid film of air scrubber internal recycle; The air air from vaporizer after the foam removal of foam removal section that contains the methanol-water steam gets into vaporizer.
8. the preparation technology of virgin gas according to claim 7 wherein goes into water vapour preheating formaldehyde circulation fluid in order to heating fumigators and air scrubber in the first absorption tower bottom blowing of driving forward direction, stops after the driving steaming out.
9. the preparation technology of virgin gas according to claim 7, in the wherein said step 3, vaporizer is not provided with the tubulation section, and then the formaldehyde circulation fluid on first absorption tower is introduced into the air scrubber external heat exchanger, gets into the interchanger cooling on first absorption tower again.
10. the preparation technology of virgin gas according to claim 6, wherein said step 5 air or the air that contains the methanol-water steam pass packing section and contact with the methanol aqueous solution liquid film is reverse, form methanol-air-water vapour gas mixture.
11. according to arbitrary described virgin gas preparation technology in the claim 6,7,8,9 or 10, wherein said water is clear water or contains methyl alcohol and/or the aqueous solution of formaldehyde.
12., on the wherein said vaporizer methanol solution circulation line strainer is set according to arbitrary described virgin gas preparation technology in the claim 6,7,8,9 or 10.
13. according to arbitrary described vaporizer in the claim 6,7,8,9 or 10, the central circulating tube of wherein said vaporizer is suitable for reading to be blind dead.
14. according to arbitrary described vaporizer in the claim 6,7,8,9 or 10, above the tubulation section of wherein said vaporizer and/or following increase packing section, perhaps do not have the tubulation section to have only packing section, the packing section top is provided with sparger.
15. according to arbitrary described vaporizer in the claim 2,6,7,8,9 or 10, the foam removal section is set in the wherein said vaporizer, described foam removal section is a material filling type.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104147800A (en) * | 2014-08-27 | 2014-11-19 | 江苏凯茂石化科技有限公司 | Two-stage methanol evaporation column and methanol evaporation technology method |
| CN104174259A (en) * | 2014-08-27 | 2014-12-03 | 江苏凯茂石化科技有限公司 | Coupling device for methanol evaporation and formaldehyde absorption |
| CN104829438A (en) * | 2015-04-01 | 2015-08-12 | 田宝峰 | Formaldehyde production method and apparatus thereof |
| 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 |
| CN110563903A (en) * | 2019-09-06 | 2019-12-13 | 无锡市华立石化工程有限公司 | preparation system and preparation process of urea formaldehyde pre-condensed liquid |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2760031Y (en) * | 2004-12-22 | 2006-02-22 | 田宝峰 | Composite type methanol evaporator |
-
2011
- 2011-12-31 CN CN201110455168.8A patent/CN102584549B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2760031Y (en) * | 2004-12-22 | 2006-02-22 | 田宝峰 | Composite type methanol evaporator |
Non-Patent Citations (3)
| Title |
|---|
| 刘芳候: "甲醛生产装置的改造", 《化工设计通报》, vol. 14, no. 4, December 1988 (1988-12-01) * |
| 张华: "浅谈甲醛生产工艺及节能优化设计", 《化学工程与装备》, no. 7, July 2008 (2008-07-01) * |
| 李广林等: "甲醛及其生产方法", 《小氮肥设计技术》, vol. 24, no. 4, 2003 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104147800A (en) * | 2014-08-27 | 2014-11-19 | 江苏凯茂石化科技有限公司 | Two-stage methanol evaporation column and methanol evaporation technology method |
| CN104174259A (en) * | 2014-08-27 | 2014-12-03 | 江苏凯茂石化科技有限公司 | Coupling device for methanol evaporation and formaldehyde absorption |
| CN104829438A (en) * | 2015-04-01 | 2015-08-12 | 田宝峰 | Formaldehyde production method and apparatus thereof |
| 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 |
| CN110563903A (en) * | 2019-09-06 | 2019-12-13 | 无锡市华立石化工程有限公司 | preparation system and preparation process of urea formaldehyde pre-condensed liquid |
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|---|---|
| CN102584549B (en) | 2014-04-16 |
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