CN102584549B - 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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- CN102584549B CN102584549B CN201110455168.8A CN201110455168A CN102584549B CN 102584549 B CN102584549 B CN 102584549B CN 201110455168 A CN201110455168 A CN 201110455168A CN 102584549 B CN102584549 B CN 102584549B
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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 unstripped gas preparation technology and equipment in Formaldehyde Production, especially a kind of formaldehyde raw material gas preparation technology and equipment that reaches reduction systemic resistance, further recycle device used heat by improving existing evaporator with central downcomer structure and heat exchange process.
Background technology
At present, domestic most Formaldehyde Production adopts conventional silver method technique.The vaporizer of conventional silver method technique is evaporator with central downcomer, produces methanol-air gas mixture, more additionally allocate ingredient water steam into by air bubbling hot methanol, forms three-element mixed gas, as the unstripped 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 be through liquid layer, and systemic resistance is large, and blower fan current consumption is large; Must consume ingredient water steam, device by-product steam vapour amount is little; The used heat of absorption system does not effectively utilize, and need to consume a large amount of water quench.
In addition, also have a small amount of Formaldehyde Production to adopt tail gas or flue gas circulation process.This process using gas blower is circulated back to reactor by the stack gas of formaldehyde absorption tail gas or tail gas boiler, replaces part ingredient water steam, has saved a part of water vapour.But increased power consumption because increasing recirculation blower; Methanol evaporator is reboiler formula vaporizer, and evaporation has consumed a large amount of water vapour as thermal source to adopt water vapor; Stack gas circulation has reduced the combustible gas concentration in tail gas, has reduced the thermo-efficiency of tail gas furnace.
Summary of the invention:
The object of the invention is to solve the shortcoming and deficiency that above-mentioned technique exists, a kind of modification scheme for the evaporator with central downcomer in existing apparatus and reboiler formula vaporizer is provided, and technical process and the working method of corresponding new vaporizer.
A vaporizer for raw material gas in methanal production, 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 tubulation section and/or below increase filler, or do not have tubulation section to only have packing section, above packing section, be provided with sparger; And material filling type foam removal section is set on vaporizer top substitutes baffle plate type foam removal section.Can be chosen in and add again a scrubber tower or gas washing section before vaporizer to improve the cleanliness factor of unstripped gas.
For a unstripped gas device for Formaldehyde Production, comprise vaporizer, vaporizer recycle pump, strainer, oxidizer cooling section, the first absorption tower, the first absorption tower interchanger, formaldehyde recycle pump;
The bottom liquid outlet of described vaporizer is connected with strainer by vaporizer recycle pump; Described strainer is connected with the fluid inlet of vaporizer packing section top by oxidizer cooling section;
Described the first lower end, absorption tower is connected with vaporizer tubulation section shell side fluid inlet by formaldehyde recycle pump; Described the first upper end, absorption tower is connected with vaporizer tubulation section shell side liquid outlet by interchanger.
Described vaporizer is evaporator with central downcomer, and it is provided with central circulating tube, tubulation section, packing section, foam removal section and air, methyl alcohol, three entrances of moisturizing; At vaporizer middle part, be provided with central circulating tube and tubulation section, central circulating tube is suitable for reading blind dead; On tubulation section and/or below packing section is set, above packing section, be provided with sparger; And on vaporizer top, foam removal section being set, described foam removal section is material filling type; Described vaporizer bottom is provided with air or air Mixture, methyl alcohol and three entrances of moisturizing.
An air scrubber is separately established in the outside of described vaporizer, in air scrubber bottom, establishes a gas inlet; Air scrubber is established external heat exchanger.
Described vaporizer is packing tower structure; It is provided with packing section, foam removal section and air, methyl alcohol, three entrances of moisturizing; At vaporizer middle part, be provided with packing section, above packing section, be provided with sparger; And on vaporizer top, foam removal section is set; In vaporizer bottom, be provided with air, methyl alcohol and three entrances of moisturizing.
An air scrubber is separately established in described vaporizer outside, in air scrubber bottom, establishes a gas inlet; Air scrubber is established external heat exchanger.
A preparation technology for raw material gas in methanal production, comprises the steps:
Step 1: add in proportion first alcohol and water in vaporizer, liquid level is controlled at below air intlet simultaneously;
Step 2: the first absorption tower bottom blowing of driving forward direction enters water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stops steaming out after driving;
Step 3: the formaldehyde circulation fluid on the first absorption tower enters vaporizer tubulation section shell side successively, then it is cooling to enter the water cooler on the first absorption tower;
Step 4: first alcohol and water is mixed to form methanol aqueous solution at base of evaporator, enters oxidizer cooling section heating after being filtered with the extraction of vaporizer recycle pump, returns filler top spray;
Step 5: air or the air that contains methanol-water steam contact with methanol aqueous solution liquid film is reverse through tubulation section tube side, packing section, form methanol-air-water vapour gas mixture.
Wherein before described step 4, increase by a step:
In vaporizer outside, be provided with air scrubber, methanol aqueous solution, by external heat exchanger and the heat exchange of formaldehyde circulation fluid of air scrubber, returns filler top spray; Air enters from air scrubber bottom, by packing section with carry out flash-pot and reverse contact of methanol aqueous solution liquid film of air scrubber internal recycle, wash airborne impurity off, and form the air that contains methanol-water steam; The air that contains methanol-water steam enters vaporizer from the air intlet of vaporizer after the foam removal of foam removal section.
Wherein in the first absorption tower bottom blowing of driving forward direction, enter water vapour preheating formaldehyde circulation fluid in order to heating fumigators and air scrubber, after driving, stop steaming out.
In wherein said step 3, vaporizer is not provided with tubulation section, and the formaldehyde circulation fluid on the first absorption tower is introduced into air scrubber external heat exchanger, then it is cooling to enter the interchanger on the first absorption tower.
In wherein said step 5, air or the air that contains methanol-water steam contact with methanol aqueous solution liquid film is reverse through packing section, formation methanol-air-water vapour gas mixture.
Wherein said water is clear water or contains methyl alcohol and/or the aqueous solution of formaldehyde.
On wherein said vaporizer methanol solution circulation line, strainer is set.
The central circulating tube of wherein said vaporizer is suitable for reading is blind dead.
Above the tubulation section of wherein said vaporizer and/or increase packing section below, or do not have tubulation section to only have packing section, packing section top is provided with sparger.
Foam removal section is set in wherein said vaporizer, and described foam removal section is material filling type.
The invention has the beneficial effects as follows, formaldehyde raw material gas preparation technology of the present invention, changes very littlely to traditional technology, equipment, and transformation drops into low; Systemic resistance is little, and blower fan current consumption is little; No longer consume ingredient water steam and methyl alcohol evaporation water vapour, device by-product steam vapour amount is large; The used heat of absorption system is effectively used, and saves a large amount of water coolants.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention figure;
Fig. 2 is process flow sheet of the present invention;
Fig. 3 is the process flow sheet that air scrubber is located at vaporizer side;
Fig. 4 is the process flow sheet that air scrubber is located at vaporizer below;
Fig. 5 is the another kind of process flow sheet that air scrubber is located at vaporizer side;
In figure: 1. the external heat exchanger 18. air Mixture imports of foam removal section 15. air scrubber recycle pump 16. air scrubber strainer 17. air scrubbers of packing section 14. air scrubbers of interchanger 12. air scrubber 13. air scrubbers on 10. formaldehyde recycle pump 11. first absorption towers, vaporizer 2. tubulation section 3. central circulating tube 4. packing section 5. foam removal section 6. oxidizer cooling section 7. strainer 8. vaporizer recycle pump 9. first absorption tower.
Embodiment
The present invention is further detailed explanation with preferred embodiment by reference to the accompanying drawings now.The schematic diagram of this accompanying drawing for simplifying, typical process flow of the present invention and device structure are only 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)
For a unstripped gas device for Formaldehyde Production, as shown in Figure 1, the interchanger 11, the first absorption tower 9, the formaldehyde recycle pump 10 that comprise vaporizer 1, vaporizer recycle pump 8, strainer 7, oxidizer 6 cooling sections, the first absorption tower; Methanol aqueous solution enters oxidizer heating being filtered with the extraction of vaporizer recycle pump from base of evaporator, returns packing section top spray; Air contacts with methanol aqueous solution liquid film is reverse with packing section through tubulation section, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer after foam removal section; The formaldehyde circulation fluid on the first absorption tower is extracted out and is entered the methanol aqueous solution in vaporizer tubulation section heating fumigators with formaldehyde recycle pump, then it is cooling to enter the first absorption tower interchanger.
Described vaporizer is evaporator with central downcomer, and it is provided with central circulating tube 3, tubulation section 2, packing section 4, foam removal section 5; At vaporizer middle part, be provided with central circulating tube and tubulation section, central circulating tube is suitable for reading blind dead; On tubulation section and/or below packing section is set, above packing section, be provided with sparger; And on vaporizer top, foam removal section being set, described foam removal section is material filling type.Above-mentioned vaporizer bottom can be provided with air, methyl alcohol and three entrances of moisturizing.
Central circulating tube 3 upper ends are blind dead; Softening water or de-salted water are connected with the water supplement port of vaporizer 1 bottom; On tubulation section 2, increase filler, above filler, be provided with sparger; And material filling type foam removal section is set on vaporizer top substitutes baffle plate type foam removal section; The formaldehyde circulation fluid on the first absorption tower 9 is first connected to vaporizer tubulation section 2 shell sides, then it is cooling to access original interchanger; Remove hot water tank system, change methanol aqueous solution into from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section 6 → packing section 4 top sprays; In 9 bottoms, the first absorption tower, set up steam and add pipeline.
As shown in Figure 2, the interior while of vaporizer 1 adds methyl alcohol and clear water in proportion, and liquid level is controlled at below air intlet; 9 bottoms, driving forward direction the first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stop steaming out after driving; The formaldehyde circulation fluid on the first absorption tower 9 is extracted out and is entered the methanol aqueous solution in vaporizer tubulation section 2 shell side heating fumigators 1 with formaldehyde recycle pump 10, then it is cooling to enter the first absorption tower interchanger 11; Methanol aqueous solution is extracted out and after filter 7 filters, is entered 6 heating of oxidizer cooling section from vaporizer 1 bottom with recycle pump 8, returns filler 4 top sprays; Air contacts with methanol aqueous solution liquid film is reverse with filler 4 through tubulation section 2 tube sides, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
With 50,000 tons/year of formaldehyde plants, formaldehyde yield 7t/h is example, production effect before and after contrast transformation:
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 of methanal absorbing system end is connected with the water supplement port of vaporizer 1 bottom; On tubulation section 2, increase filler, above filler, be provided with sparger; And material filling type foam removal section is set on vaporizer top substitutes baffle plate type foam removal section; The formaldehyde circulation fluid on the first absorption tower 9 is first connected to vaporizer tubulation section 2 shell sides, then it is cooling to access original interchanger; Remove hot water tank system, change methanol aqueous solution into from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section 6 → packing section 4 top sprays; In 9 bottoms, the first absorption tower, set up steam and add pipeline.
The interior while of vaporizer 1 adds methyl alcohol and formaldehyde absorbing tower washing section dilute methanol solution in proportion, and liquid level is controlled at below air intlet; 9 bottoms, driving forward direction the first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stop steaming out after driving; The formaldehyde circulation fluid on the first absorption tower 9 is extracted out and is entered the methanol aqueous solution in vaporizer tubulation section 2 shell side heating fumigators 1 with formaldehyde recycle pump 10, then it is cooling to enter the first absorption tower interchanger 11; Methanol aqueous solution is extracted out and after filter 7 filters, is entered 6 heating of oxidizer cooling section from vaporizer 1 bottom with recycle pump 8, returns packing section 4 top sprays; Air contacts with methanol aqueous solution liquid film is reverse with packing section 4 through tubulation section 2 tube sides, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
To vaporizer, add the aqueous solution that contains methyl alcohol can reduce methyl alcohol unit consumption.The above-mentioned aqueous solution that contains methyl alcohol also can replace with the aqueous solution that contains methyl alcohol and formaldehyde.
With 50,000 tons/year of formaldehyde plants, formaldehyde yield 7t/h is example, production effect before and after contrast transformation:
Embodiment 3 (vaporizer: packing tower structure, there is no central circulating tube and tubulation section, and vaporizer side is provided with air scrubber)
Adopt air scrubber 12 at the unstripped gas Preparation equipment on vaporizer 1 side, gas inlet is located at air scrubber bottom, and the gas inlet after washing, methanol inlet, water supplement port are located at vaporizer bottom, and clear water is connected with this water supplement port; Air scrubber mixed gas outlet is connected with evaporator air entrance; Air washing tower bottom is connected with base of evaporator; Air scrubber middle part is packing section 13, is provided with sparger above packing section; And material filling type foam removal section 14 is set on air scrubber top; Vaporizer middle part is packing section, is provided with sparger above packing section; And material filling type foam removal section is set on vaporizer top; In air scrubber outside, be provided with plate-type heat exchanger 17, the formaldehyde circulation fluid on the first absorption tower 9 is first accessed to the external plate-type heat exchanger of air scrubber, then it is cooling to access the first absorption tower interchanger; 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 top sprays; Vaporizer methanol aqueous solution is from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section → packing section 4 top sprays; In 9 bottoms, the first absorption tower, set up steam and add pipeline.
As shown in Figure 3, the interior while of vaporizer 1 adds methyl alcohol and clear water in proportion, because air scrubber is connected with base of evaporator, therefore both liquid levels are basic identical, controls air scrubber liquid level below air intlet; 9 bottoms, driving forward direction the first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heat the methanol solution in air scrubber, stop steaming out after driving; The formaldehyde circulation fluid on the first absorption tower 9 is extracted out and is introduced into the external plate-type heat exchanger heating methanol of the air scrubber aqueous solution with formaldehyde recycle pump 10, then it is cooling to enter the first absorption tower interchanger 11; Methanol aqueous solution enters the external plate-type heat exchanger heating of air scrubber being filtered with the extraction of air scrubber recycle pump from air washing tower bottom, returns filler top spray; Air contacts with methanol aqueous solution liquid film is reverse through filler, forms the air that contains methanol-water steam; The air that contains methanol-water steam air intlet from vaporizer 1 after the foam removal of foam removal section enters vaporizer 1; Methanol aqueous solution is extracted out and after filter 7 filters, is entered the heating of oxidizer cooling section from vaporizer 1 bottom with vaporizer recycle pump 8, returns filler 4 top sprays; The air that contains methyl alcohol, water vapour contacts with methanol aqueous solution liquid film is reverse through 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 and can washes the impurity such as koniology off, can reduce methyl alcohol unit consumption.
With 50,000 tons/year of formaldehyde plants, formaldehyde yield 7t/h is example, production effect before and after contrast transformation:
Embodiment 4 (vaporizer: packing tower structure, there is no central circulating tube and tubulation section, and vaporizer below is provided with air scrubber)
Adopt the unstripped gas Preparation equipment of air scrubber below vaporizer, gas inlet is located at air scrubber bottom, gas inlet after washing, methanol inlet, water supplement port are located at vaporizer bottom, and formaldehyde absorbing tower washing section dilute methanol solution is connected with this water supplement port; Air scrubber middle part is filler, is provided with sparger above filler; And material filling type foam removal section is set on air scrubber top; Vaporizer middle part is filler, is provided with sparger above filler; And material filling type foam removal section 5 is set on vaporizer top; In air scrubber outside, be provided with plate-type heat exchanger 17, the formaldehyde circulation fluid on the first absorption tower 9 is first connected to the external plate-type heat exchanger 17 of air scrubber, then it be cooling to access the first absorption tower interchanger; 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 top sprays; Evaporator section methanol aqueous solution is from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section → packing section 4 top sprays; In 9 bottoms, the first absorption tower, set up steam and add pipeline.
As shown in Figure 4, the interior while of vaporizer 1 adds methyl alcohol and the formaldehyde absorbing tower washing section dilute methanol solution of air scrubber in proportion, and liquid level reaches the backward air scrubber overflow below of requirement for height, controls air scrubber liquid level below air intlet; 9 bottoms, driving forward direction the first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heat air scrubber, stop steaming out after driving; The formaldehyde circulation fluid on the first absorption tower 9 is extracted out and is entered the external plate-type heat exchanger heating methanol of the air scrubber aqueous solution with formaldehyde recycle pump 10, then it is cooling to enter the first absorption tower interchanger 11; Methanol aqueous solution enters the external plate-type heat exchanger heating of air scrubber being filtered with the extraction of air scrubber recycle pump from air washing tower bottom, returns packing section top spray; Air enters through packing section and contacts with methanol aqueous solution liquid film is reverse from air scrubber bottom, forms the air that contains methanol-water steam; The air Mixture that contains methanol-water steam air Mixture import 18 from vaporizer 1 after the foam removal of foam removal section enters vaporizer 1; Methanol aqueous solution is extracted out and after filter 7 filters, is entered the heating of oxidator tube array section from vaporizer 1 bottom with recycle pump 8, returns filler 4 top sprays; Air contacts with methanol aqueous solution liquid film is reverse through 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 and can washes the impurity such as koniology off, can reduce methyl alcohol unit consumption.To vaporizer, add the aqueous solution that contains methyl alcohol can reduce methyl alcohol unit consumption.The above-mentioned aqueous solution that contains methyl alcohol also can replace with the aqueous solution that contains methyl alcohol and formaldehyde.
With 50,000 tons/year of formaldehyde plants, formaldehyde yield 7t/h is example, production effect before and after contrast transformation:
Embodiment 5 (vaporizer is provided with central circulating tube and tubulation section, and vaporizer side is provided with air scrubber)
Adopt air scrubber at the unstripped gas Preparation equipment on vaporizer side, gas inlet is located at air scrubber bottom, and the gas inlet after washing, methanol inlet, water supplement port are located at vaporizer bottom, and clear water is connected with this water supplement port; Air scrubber mixed gas outlet is connected with evaporator air entrance; Air washing tower bottom is connected with base of evaporator; Air scrubber middle part is filler, is provided with sparger above filler; And material filling type foam removal section is set on air scrubber top; Vaporizer middle part is provided with central circulating tube and tubulation section, and central circulating tube is suitable for reading blind dead; On 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 vaporizer top; In air scrubber outside, be provided with plate-type heat exchanger, the formaldehyde circulation fluid on the first absorption tower 9 is first connected to vaporizer tubulation section, then access the external plate-type heat exchanger of air scrubber, finally access the first absorption tower interchanger cooling; 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 top sprays; Evaporator section methanol aqueous solution is from vaporizer 1 bottom → vaporizer recycle pump 8 → strainer 7 → oxidizer cooling section → packing section 4 top sprays; In 9 bottoms, the first absorption tower, set up steam and add pipeline.
As shown in Figure 5, the interior while of vaporizer 1 adds methyl alcohol and clear water in proportion, because air scrubber is connected with base of evaporator, therefore both liquid levels are basic identical, controls air scrubber liquid level below air intlet; 9 bottoms, driving forward direction the first absorption tower are blown into water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stop steaming out after driving; The formaldehyde circulation fluid on the first absorption tower 9 is extracted out and is entered the vaporizer tubulation section heating methanol aqueous solution with formaldehyde recycle pump 10, then enters the external plate-type heat exchanger heating methanol of the air scrubber aqueous solution, finally enters the first absorption tower interchanger 11 cooling; Methanol aqueous solution enters the external plate-type heat exchanger heating of air scrubber being filtered with the extraction of air scrubber recycle pump from air washing tower bottom, returns filler top spray; Air contacts with methanol aqueous solution liquid film is reverse through filler, forms the air that contains methanol-water steam; The air that contains methanol-water steam air intlet from vaporizer 1 after the foam removal of foam removal section enters vaporizer 1; Methanol aqueous solution is extracted out and after filter 7 filters, is entered the heating of oxidizer cooling section from vaporizer 1 bottom with vaporizer recycle pump 8, returns filler 4 top sprays; The air that contains methanol-water steam contacts with methanol aqueous solution liquid film is reverse with filler 4 through tubulation section, forms methanol-air-water vapour gas mixture; Gas mixture leaves vaporizer 1 after 5 foam removals of foam removal section.
Air scrubber is set and can washes the impurity such as koniology off, can reduce methyl alcohol unit consumption.
With 50,000 tons/year of formaldehyde plants, formaldehyde yield 7t/h is example, production effect before and after contrast transformation:
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All within principle of the present invention and spirit, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (15)
1. for a unstripped gas device for Formaldehyde Production, it is characterized in that, comprise vaporizer, vaporizer recycle pump, strainer, oxidizer cooling section, the first absorption tower, the first absorption tower interchanger, formaldehyde recycle pump;
The bottom liquid outlet of described vaporizer is connected with strainer by vaporizer recycle pump; Described strainer is connected with the fluid inlet of vaporizer packing section top by oxidizer cooling section;
Described the first lower end, absorption tower is connected with vaporizer tubulation section shell side fluid inlet by formaldehyde recycle pump; Described the first upper end, absorption tower is connected with vaporizer tubulation section shell side liquid outlet by interchanger.
2. unstripped gas device according to claim 1, wherein, described vaporizer is evaporator with central downcomer, it is provided with central circulating tube, tubulation section, packing section, foam removal section and air, methyl alcohol, three entrances of moisturizing; At vaporizer middle part, be provided with central circulating tube and tubulation section, central circulating tube is suitable for reading blind dead; On tubulation section and/or below packing section is set, above packing section, be provided with sparger; And on vaporizer top, foam removal section is set; Described vaporizer bottom is provided with air or air Mixture, methyl alcohol and three entrances of moisturizing.
3. unstripped gas device according to claim 2, wherein, an air scrubber is separately established in the outside of described vaporizer, in air scrubber bottom, establishes a gas inlet; Air scrubber is established external heat exchanger.
4. unstripped gas device according to claim 1, wherein, described vaporizer is packing tower structure; It is provided with packing section, foam removal section and air, methyl alcohol, three entrances of moisturizing; At vaporizer middle part, be provided with packing section, above packing section, be provided with sparger; And on vaporizer top, foam removal section is set; In vaporizer bottom, be provided with air, methyl alcohol and three entrances of moisturizing.
5. unstripped gas device according to claim 4, wherein, an air scrubber is separately established in described vaporizer outside, in air scrubber bottom, establishes a gas inlet; Air scrubber is established external heat exchanger.
6. a preparation method for raw material gas in methanal production, is characterized in that, comprises the steps:
Step 1: add in proportion first alcohol and water in vaporizer, liquid level is controlled at below air intlet simultaneously;
Step 2: the first absorption tower bottom blowing of driving forward direction enters water vapour preheating formaldehyde circulation fluid in order to heating fumigators, stops steaming out after driving;
Step 3: the formaldehyde circulation fluid on the first absorption tower enters vaporizer tubulation section shell side successively, then it is cooling to enter the water cooler on the first absorption tower;
Step 4: first alcohol and water is mixed to form methanol aqueous solution at base of evaporator, enters oxidizer cooling section heating after being filtered with the extraction of vaporizer recycle pump, returns filler top spray;
Step 5: air or contain Jia Chun ?the air of water vapour through tubulation section tube side, packing section, contact with methanol aqueous solution liquid film is reverse, formation Jia Chun ?Kong Qi ?water vapour gas mixture.
7. the preparation method of unstripped gas according to claim 6 wherein increased by a step before described step 4:
In vaporizer outside, be provided with air scrubber, methanol aqueous solution, by external heat exchanger and the heat exchange of formaldehyde circulation fluid of air scrubber, returns filler top spray; Air enters from air scrubber bottom, by packing section with carry out flash-pot and reverse contact of methanol aqueous solution liquid film of air scrubber internal recycle, wash airborne impurity off, and form the air that contains first alcohol ?water vapour; Contain Jia Chun ?the air of water vapour after the foam removal of foam removal section, from the air intlet of vaporizer, enter vaporizer.
8. the preparation method of unstripped gas according to claim 7, wherein enters 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 steaming out after driving.
9. the preparation method of unstripped gas according to claim 7, in wherein said step 3, vaporizer is not provided with tubulation section, and the formaldehyde circulation fluid on the first absorption tower is introduced into air scrubber external heat exchanger, then it is cooling to enter the interchanger on the first absorption tower.
10. the preparation method of unstripped gas according to claim 6, in wherein said step 5, air or the air that contains first alcohol ?water vapour contact with methanol aqueous solution liquid film is reverse through packing section, form first alcohol ?sky gas ?water vapour gas mixture.
11. according to arbitrary described unstripped gas preparation method in claim 6,7,8,9 or 10, and wherein said water is clear water or contains methyl alcohol and/or the aqueous solution of formaldehyde.
12. according to arbitrary described unstripped gas preparation method in claim 6,7,8,9 or 10, on wherein said vaporizer methanol solution circulation line, strainer is set.
13. according to arbitrary described unstripped gas preparation method in claim 6,7,8,9 or 10, and the central circulating tube of wherein said vaporizer is suitable for reading is blind dead.
14. according to arbitrary described unstripped gas preparation method in claim 6,7,8,9 or 10, above the tubulation section of wherein said vaporizer and/or increase packing section below, or does not have tubulation section to only have packing section, and packing section top is provided with sparger.
15. according to arbitrary described unstripped gas preparation method in claim 6,7,8,9 or 10, and foam removal section is set in wherein said vaporizer, and described foam removal section is material filling type.
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| CN104147800B (en) * | 2014-08-27 | 2017-01-18 | 江苏凯茂石化科技有限公司 | Two-stage methanol evaporation column and methanol evaporation technology method |
| CN104174259B (en) * | 2014-08-27 | 2016-03-23 | 江苏凯茂石化科技有限公司 | A kind of coupling device of methyl alcohol evaporation-formaldehyde absorption |
| CN104829438B (en) * | 2015-04-01 | 2016-08-24 | 田宝峰 | A kind of prepn. of formaldehyde and device |
| 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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|---|---|---|---|---|
| CN2760031Y (en) * | 2004-12-22 | 2006-02-22 | 田宝峰 | Composite type methanol evaporator |
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| CN102584549A (en) | 2012-07-18 |
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