CN203999471U - A kind ofly be with anti-blocking pipeline production technology of paraformaldehyde device - Google Patents
A kind ofly be with anti-blocking pipeline production technology of paraformaldehyde device Download PDFInfo
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- CN203999471U CN203999471U CN201420402361.4U CN201420402361U CN203999471U CN 203999471 U CN203999471 U CN 203999471U CN 201420402361 U CN201420402361 U CN 201420402361U CN 203999471 U CN203999471 U CN 203999471U
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- 229930040373 Paraformaldehyde Natural products 0.000 title claims abstract description 47
- 229920002866 paraformaldehyde Polymers 0.000 title claims abstract description 47
- 238000005516 engineering process Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 145
- 239000003595 mist Substances 0.000 claims abstract description 32
- 238000001704 evaporation Methods 0.000 claims abstract description 23
- 230000008020 evaporation Effects 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 55
- 238000010521 absorption reaction Methods 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 27
- 239000008098 formaldehyde solution Substances 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 9
- 239000006200 vaporizer Substances 0.000 claims description 8
- 239000007792 gaseous phase Substances 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 abstract description 17
- 239000002245 particle Substances 0.000 abstract description 16
- 239000007788 liquid Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 239000006096 absorbing agent Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 239000002585 base Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 206010000234 Abortion spontaneous Diseases 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 208000015994 miscarriage Diseases 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 208000000995 spontaneous abortion Diseases 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010533 azeotropic distillation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Phenolic Resins Or Amino Resins (AREA)
Abstract
The utility model discloses a kind of production technology of paraformaldehyde device with anti-blocking pipeline, comprise formaldehyde evaporation concentration device, mist projection granulating tower, fluidized bed dryer, cyclonic separator, device for absorbing tail gas and anti-blockage valve, the arm of pure water is provided on the pipeline that the utility model is connected with spray granulating and drying device entrance at formaldehyde evaporation concentration device circulating, this arm is provided with anti-blockage valve, thus the line clogging of effectively avoiding parking to cause in production process; Can effectively disperse formaldehyde to prevent prepolymerization, can obtain particle diameter homogeneous polymerization degree at the paraformaldehyde product of 12 left and right simultaneously.
Description
Technical field
The utility model belongs to chemical production equipment technical field, relates in particular to for paraformaldehyde process unit equipment.
Background technology
At present, the production technology of paraformaldehyde route that domestic and international application is more ripe mainly contains following several: vacuum rake style drier is dried paraformaldehyde processed; Metal belt is dried paraformaldehyde processed; Spray method; Azeotropic distillation.The difficult pulverizing of product lumps that these processing methodes obtain, can not directly obtain granular paraformaldehyde product, and floor space is large, and energy consumption is large, is eliminated gradually.More advanced processing method is atomizing granulating technology now, and the method is reliable and stable, and the product obtaining is particulate state paraformaldehyde.At present, because highly concentrated formaldehyde solution is in carrying out mist projection granulating process, the paraformaldehyde polymerization degree is difficult to be controlled at 12 left and right, affect quality product, simultaneously in the atomizing granulating technology of most domestic producer, heat utilization rate is low, and energy consumption is high, and clout reclaims not do and optimizes, cause product cost high, lack the market competitiveness.
Can there is polymerization in formalin, generate the polymer of paraformaldehyde-white powdery linear structure in long-term storage or concentration operation process.Reaction equation is as follows:
The balanced reaction generating is subject to H
+the impact of concentration is larger, and the existence of micro-polar material, as acid, alkali and water etc. all can accelerate the carrying out of polyreaction.Temperature also has impact, and when temperature is low, reaction is moved to the direction that generates polymkeric substance, when temperature raises to reverse movement.When temperature is very high, depolymerization generates monomer even completely, and while especially having acid to exist, heating more easily makes it be depolymerized to gaseous formaldehyde monomer.Prepare paraformaldehyde key and be to control the product polymerization degree, prevent the polymerization of formaldehyde height, shorten the drying and dehydrating time, improve product yield.Formaldehyde solution is by being pumped in prilling tower, and through shower nozzle, sprays cooling polymerization and form the polymerization degree at the paraformaldehyde of the uniform grading of n=11 left and right, thereby just can guarantee the quality of paraformaldehyde.In addition when production line needs parking maintenance, easy remaining formaldehyde or paraformaldehyde particle plugging pipeline in pipeline.
Summary of the invention
Goal of the invention: for problem and the defect of above-mentioned existence, the utility model provides a kind of anti-blocking pipeline production technology of paraformaldehyde device of being with, can prepare particle diameter homogeneous polymerization degree at the paraformaldehyde particle of 12 left and right, and energy effective recycling waste heat and by product, thereby reach, reduce energy consumption and product cost, improve the market competitiveness.
Technical scheme: for achieving the above object, the utility model is by the following technical solutions: a kind of production technology of paraformaldehyde device with anti-blocking pipeline, comprise formaldehyde evaporation concentration device, mist projection granulating tower, fluidized bed dryer, cyclonic separator, device for absorbing tail gas and anti-blockage valve, the outlet of described formaldehyde evaporation concentration device is connected with mist projection granulating column overhead entrance by pipeline and under the effect of formaldehyde transferpump, described fluidized bed dryer is located at the below of mist projection granulating column overhead outlet, and the bottom of fluidized bed dryer is provided with nitrogen delivery port; The gaseous phase outlet on described mist projection granulating tower top and the gaseous phase outlet of fluidized bed dryer are all communicated with the entrance of cyclonic separator, and the outlet of cyclonic separator is connected with device for absorbing tail gas; Described formaldehyde evaporation concentration device is provided with the arm for the pure water that circulates with the pipeline that spray granulating and drying device entrance is connected, and this arm is provided with anti-blockage valve.
Described mist projection granulating tower is provided with shower nozzle, and this shower nozzle comprises nozzle and the tube stub being threaded connection, and described nozzle comprises nozzle body and the nozzle bore that is located at nozzle body front end, and the centre of described nozzle body is embedded with dismountable spiral runner blade.
After described fluidized bed dryer, be also provided with sieve apparatus.(please indicate the effect of sieve apparatus herein)
Described formaldehyde evaporation concentration device comprises the first absorption tower, vaporizer, primary separator and second-stage separator, the outlet of described vaporizer is connected with the entrance on primary separator top, primary separator outlet at bottom is connected with second-stage separator upper entrance by pump, and second-stage separator outlet at bottom is connected with mist projection granulating tower by pump; The top of described primary separator and second-stage separator is connected with the entrance of the first bottom, absorption tower by pipeline, and the stage casing on the first absorption tower and top are equipped with the entrance for rare formaldehyde solution that circulates.
Described device for absorbing tail gas comprises the first absorption tower, second absorption tower and the 3rd absorption tower connecting successively, forms circulation line at the bottom of the tower top on each absorption tower and tower, and circulation line is provided with interchanger
The bottom of described cyclonic separator is also provided with worm conveyor, and this worm conveyor is connected respectively with top with the middle and lower part of prilling tower with blower fan by pipeline.Thereby cyclonic separator is collected to the drier paraformaldehyde dust obtaining, under the effect of blower fan, by nitrogen, carry top or the middle and lower part that is delivered to prilling tower, thereby the paraformaldehyde particle random collision larger with humidity in prilling tower accelerated to mix, when being agglomerated into the even paraformaldehyde of particle diameter, play the effect of accelerating drying and dehydrating.
Beneficial effect: compared with prior art, the utlity model has following advantage: the line clogging of effectively avoiding parking to cause in production process; Can effectively disperse formaldehyde to prevent prepolymerization, can obtain particle diameter homogeneous polymerization degree at the paraformaldehyde product of 12 left and right simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of formaldehyde solution evaporation concentration device described in the utility model;
Fig. 2 is the structural representation of mist projection granulating described in the utility model and drying installation;
Fig. 3 is device for absorbing tail gas structural representation described in the utility model;
Fig. 4 is the structural representation of mist projection granulating tower described in the utility model;
The structural representation of airflow-distribution board in Fig. 5 mist projection granulating tower described in the utility model;
The structural representation of Fig. 6 distribution showerhead described in the utility model;
Fig. 7 is the partial enlarged drawing of a-quadrant in Fig. 6;
Fig. 8 is the structural representation of scraper-type separator described in the utility model;
Fig. 9 is scraper-type separator cross section structure schematic diagram described in the utility model.
Wherein, vaporizer 1, primary separator 2, second-stage separator 3, surge tank 4, mist projection granulating tower 5, fluidized bed dryer 6, cyclonic separator 7, first grade absorption tower 8, the first absorption tower 9, second absorption tower 10, the 3rd absorption tower 11, interchanger 12, transferpump 13, stabilized pressure pump 14; Central shaft 31, union lever 32, peripheral dry 33, fixed ring 34, elastic scraper 35, blend stop 36; The anti-blocking scarce figure of surge tank stabilized pressure pump; Tower body 51, air distributor 52, interior ring air channel 521, outer shroud air channel 522, nitrogen inlet 523, air flue 524, shower nozzle 53, nozzle 531, tube stub 532, nozzle body 533, nozzle bore 534, spiral runner blade 535, outer face 536, stepped cambered surface 537; Fluidised bedplate 61, bulge 62.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment and only for the utility model is described, be not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present utility model.
As described in Figure 1, a kind of production technology of paraformaldehyde device, mainly comprises three parts: formaldehyde solution evaporation concentration device, mist projection granulating and drying installation and device for absorbing tail gas.
First part: formaldehyde solution evaporation concentration
Wherein, formaldehyde solution evaporation concentration device mainly comprises vaporizer, primary separator, second-stage separator and the surge tank connecting successively.In order to improve evaporation concentration efficiency, in the present embodiment, rare formaldehyde solution of 40% left and right is delivered to vaporizer by feedstock pump, with vaporizer chuck in steam heat-exchanging evaporation after enter in primary separator, under 60～70 ℃, the condition of pressure-30～-60KPa, carry out gas-liquid separation, gas phase part is gone out (as preferred version from primary separator top, gas phase is sent into absorption tower and is reclaimed), through obtaining 70～85% formaldehyde solution after concentrated, from the bottom of primary separator, flow out, and send in second-stage separator further concentrated by formaldehyde transferpump.This second-stage separator is scraper-type, it comprises air flow inlet, cylindrical tube, cage shape rotating cylinder and elastic scraper, the cylindrical tube center that is located at of described cage shape rotating cylinder, a side of elastic scraper is located on the circumference of cage shape rotating cylinder, and another side rides over the inwall of cylindrical shell; Described air flow inlet arranges and turns to equidirectional setting with cage shape rotating cylinder along cylindrical shell is tangential.When formaldehyde solution enters into after second-stage separator (scraper-type separator), formaldehyde solution is stirred in scraper plate rotation, under the blend stop left and right of a head-on side of rotating at scraper plate, formaldehyde solution centrifugal the springing up that be more prone to make progress, improve the liquid membrane of cylinder inboard wall, thereby quickening evaporation concentration, coordinate with it be formaldehyde solution send into second-stage separator (scraper-type separator) enter the setting of opening's edge separator tangential direction, thereby make formaldehyde solution tangentially to enter raising evaporation effect along inwall; Existence due to blend stop simultaneously can reflux to the raw appropriate parallel zonule of the disturbance solution of liquid miscarriage, thereby can prevent that the prepolymerization of formaldehyde is beneficial to the uniform particles degree of follow-up mist projection granulating paraformaldehyde.The present embodiment adopts another consideration of blend stop scraper plate to be: if adopt common rotating paddle, there is no on the one hand liquid flow disturbance, formaldehyde easy polymerization when becoming membrane stage to carry out evaporation concentration, can improve film forming area on the other hand, thereby improves evaporation concentration speed.Existence due to blend stop simultaneously can reflux to the raw appropriate parallel zonule of the disturbance solution of liquid miscarriage, thereby can prevent that the prepolymerization of formaldehyde is beneficial to the uniform particles degree of follow-up mist projection granulating paraformaldehyde.
As preferred version, in evaporation concentration device, the first absorption tower can also be set, the bottom of sending into the first absorption tower by pipeline from primary separator and the second-stage separator top gas that contains formaldehyde is out carried out formaldehyde absorption and is obtained rare formaldehyde, thereby having reclaimed formaldehyde reduces costs, reduce discharge and prevent contaminate environment, the tail gas after absorbing is sent into device for absorbing tail gas again and is processed.Further improve, the first absorption tower is divided into three absorber portions from bottom to up, and the outlet of each absorber portion bottom is communicated with and is formed circulation by formaldehyde recycle pump and corresponding absorber portion top entrance.
As preferred version, described formaldehyde evaporation concentration device is provided with the arm for the pure water that circulates with the pipeline that spray granulating and drying device entrance is connected, and this arm is provided with anti-blockage valve.Thereby when process unit needs parking maintenance to safeguard, close formaldehyde and carry valve, open anti-blockage valve and carry pure water to clean the pipeline of whole process unit, thereby preventing formaldehyde or paraformaldehyde polymerization blocking pipe.
As preferred version, second-stage separator (dual circulation is concentrated) is divided into three absorber portions from bottom to up, and the outlet of each absorber portion bottom is communicated with and forms circulation with corresponding absorber portion top entrance by formaldehyde recycle pump, thereby greatly accelerates the evaporation concentration of formaldehyde.
Between described second-stage separator and mist projection granulating tower, be also provided with the surge tank that band stirs, at the bottom of the outlet of described second-stage separator is inserted surge tank by pipeline and below formaldehyde liquid level, space is left in formaldehyde liquid level top, and the top of surge tank is provided with the pipeline of logical nitrogen, surge tank bottom is connected with mist projection granulating tower entrance by pipeline.Formaldehyde solution concentration after concentrated through two sections can reach 85～95%, enter in surge tank, be constant pressure because thereby formaldehyde liquid level top passes into the formaldehyde solution that the nitrogen of certain pressure can guarantee to send in prilling tower, thereby while forming spraying by shower nozzle, can fully disperse, obtain the uniform paraformaldehyde particle of particle diameter.
By debugging and verification repeatedly, find: for obtaining the polymerization degree in 12 left and right, particle diameter is at the paraformaldehyde target product of 10～100 orders (preferably 20～60 orders), wherein one of crucial is that the concentrated formaldehyde solution of guaranteeing to send in mist projection granulating tower must constant voltage be sent into, and through shower nozzle, sprays at a high speed the formaldehyde mist of height of formation dispersion cooling with following current nitrogen contact heat-exchanging.The utility model provides two kinds of voltage stabilizing embodiment: (1) arranges the surge tank that band stirs between second-stage separator and mist projection granulating tower, second-stage separator outlet is directly inserted the bottom of surge tank by pipeline and below the liquid level in formaldehyde solution, liquid level leaves space above, now tank body top arranges the entrance of logical nitrogen, by valve, control pass into nitrogen pressure in 5MPa left and right, thereby can guarantee to send into the constant pressure of formaldehyde in prilling tower.(2) second way is that ripple damper is set respectively on the pipeline of transferpump both sides simultaneously, and the volume of ripple damper is the more than 1% of unit hour formaldehyde solution operational throughput, thereby can keep pressure amplitude to be controlled at below 3%.
Second section: mist projection granulating and dry
Mist projection granulating tower is tubular, and lower bottom part is conical head, it mainly comprises tower body, be located at tower body bottom products export, be located at the formaldehyde solution entrance at tower body top and be located at the nitrogen inlet on tower body top, described nitrogen inlet is connected with air distributor; Tower body inside also arranges shower nozzle, this shower nozzle is mainly comprised of nozzle and tube stub, wherein nozzle comprises nozzle body and the nozzle bore that is located at body front end, nozzle body is rectangular shaped, tail end is connected with pipe joint screw thread, nozzle body center is annular channel, is embedded spiral runner blade in this passage; Nozzle bore comprises the straight hole section of conical section and aperture simultaneously, thereby makes the formaldehyde solution of flowing through form high speed rotating dispersing morphology, ejects and forms the vaporific of high dispersive, and spiral runner blade employing is embedded mode can be for convenience detach.Simultaneously, we further improve nozzle bore, the outer face of nozzle bore is designed to the stepped cambered surface of indent, the height of ladder is 1mm, and ladder designs for fillet, make formaldehyde solution spray at a high speed along curved end and form the fluffy shape oblique from nozzle bore, the nitrogen that in the time of favourable dispersion and prilling tower top enters forms strong convection heat exchange.As preferred version, curved end is designed to step-likely can effectively improve atomizing effect, thereby to carry out heat exchange cooling with nitrogen.In addition, nozzle body adopts quarter bend dihedral to become, make the formaldehyde solution entering from tube stub form around the corner mixed flow, it while avoiding formaldehyde solution to enter, is plug flow, because when rectilinear duct length reaches one regularly, the liquid of flowing through can form relatively static upper, thereby relative mobile tailing off improved the polymerization risk of formaldehyde.
With mist projection granulating tower supporting also must comprise voltage stabilizing frequency modulation pump, combining of shower nozzle by this stabilized pressure pump and above-mentioned special construction, can virtual height disperse hydrojet that the specific surface area of formaldehyde polymer is improved greatly, the polymerization degree of the paraformaldehyde that final lyophilize obtains is in 11 left and right, and particle size distribution is even.Operational condition in mist projection granulating tower is 5～30 ℃, vacuumize under condition and carry out, nitrogen is sent into from the nitrogen inlet on tower body top, through stream of nitrogen gas grid distributor, the nitrogen of low temperature is sent into the abundant contact heat-exchanging of vaporific formaldehyde solution cooling, and with the formaldehyde spray film concurrent of shower nozzle ejection, thereby avoid reflux type to form disturbance and end stream causes the local polymerization of paraformaldehyde excessive.As improvement project, described air distributor comprises interior ring air channel and outer shroud air channel, and described outer shroud air channel is provided with nitrogen inlet, and outer shroud air channel is relatively little away from the caliber of a side of nitrogen inlet; Between the inner side in described interior ring air channel and the outside in outer shroud air channel, by a plurality of air flues, be communicated with.
Mist projection granulating tower top is provided with nitrogen outlet, nitrogen through with formaldehyde spraying heat exchange after be still mingled with a small amount of paraformaldehyde product, and extract out from nitrogen outlet, then send in the cyclonic separator of two series connection and carry out gas-liquid separation, obtain clean nitrogen tail gas and be used to internal recycling.For oxygen content in controlled circulation gas, it is worth lower than blast, need to maintain a small amount of sweeping gas, the discharge after gas wash tower washing is qualified of this gas.The solid-state paraformaldehyde obtaining from cyclonic separator separation is delivered to drying fluidized-bed and is further reclaimed dry from bottom.As preferred version, the bottom of described cyclonic separator is also provided with worm conveyor, and this worm conveyor is connected respectively with top with the middle and lower part of prilling tower with blower fan by pipeline.Thereby cyclonic separator is collected to the drier paraformaldehyde dust obtaining, under the effect of blower fan, by nitrogen, carry top or the middle and lower part that is delivered to prilling tower, thereby the paraformaldehyde particle random collision larger with humidity in prilling tower accelerated to mix, when being agglomerated into the even paraformaldehyde of particle diameter, play the effect of accelerating drying and dehydrating.
After mist projection granulating tower freezing polymerization, obtain the paraformaldehyde of left and right, polymerization degree n=11, because surface moisture has compared with juicy, therefore also need to be dried through the dry fluidized-bed of oscillatory type.Aforementioned drying fluidized-bed, for vibration three stage structure, comprises one-level dryer section, secondary drying section and cooling section, and the base plate of every section is evenly provided with a plurality of pores for logical nitrogen, and this pore is opened in protruding bulge.Wherein, the air vent openings in the bulge of the surrounding position of one-level dryer section base plate is towards central part, and air vent openings in central part bulge is towards secondary drying section; Opening in secondary drying section and the bulge of three-stage drying section base plate is towards next stage dryer section, and correspondence arranges gas blower three sections of bottoms, by blower fan, nitrogen is blown over to paraformaldehyde solid to be dried, thereby accelerates to be dried and to reclaim heat.And base plate is whole for swing type vibration, specifically by being located at the Swing Arm under base plate, and realizes by driven by motor.In technology controlling and process, the temperature of one-level dryer section is controlled at 45～80 ℃, and this section of temperature is lower, is over-drying in order to prevent paraformaldehyde particle top layer; Secondary drying section temperature is controlled at 50～100 ℃, and this section is strengthening segment, further dry to paraformaldehyde on the one hand, simultaneously dry owing to concentrating this section to heat up, thereby makes the nitrogen of flowing through can reclaim more heat; Three-stage drying section is cooling section, and this section of temperature is controlled at 10～40 ℃.
In addition, in order to reclaim the paraformaldehyde solid being mingled with in the nitrogen blowing out, we send the gas blowing out into the 3rd cyclonic separator and carry out cyclonic separation, the paraformaldehyde that cyclonic separator is collected reclaim send back to drying fluidized-bed continue dry, from the gas of cyclonic separator top separation for internal recycling.
Third part: device for absorbing tail gas
Device for absorbing tail gas in the utility model comprises the first absorption tower, second absorption tower and the 3rd absorption tower connecting successively, and the outlet on each absorption tower is provided with interchanger, absorption liberated heat is recycled, thus the consumption of minimizing steam.
Claims (6)
1. the production technology of paraformaldehyde device with anti-blocking pipeline, it is characterized in that: comprise formaldehyde evaporation concentration device, mist projection granulating tower, fluidized bed dryer, cyclonic separator, device for absorbing tail gas and anti-blockage valve, the outlet of described formaldehyde evaporation concentration device is connected with mist projection granulating column overhead entrance by pipeline and under the effect of formaldehyde transferpump, described fluidized bed dryer is located at the below of mist projection granulating column overhead outlet, and the bottom of fluidized bed dryer is provided with nitrogen delivery port; The gaseous phase outlet on described mist projection granulating tower top and the gaseous phase outlet of fluidized bed dryer are all communicated with the entrance of cyclonic separator, and the outlet of cyclonic separator is connected with device for absorbing tail gas; Described formaldehyde evaporation concentration device is provided with the arm for the pure water that circulates with the pipeline that spray granulating and drying device entrance is connected, and this arm is provided with anti-blockage valve.
2. according to claim 1 with the production technology of paraformaldehyde device of anti-blocking pipeline, it is characterized in that: described mist projection granulating tower is provided with shower nozzle, this shower nozzle comprises nozzle and the tube stub being threaded connection, described nozzle comprises nozzle body and the nozzle bore that is located at nozzle body front end, and the centre of described nozzle body is embedded with dismountable spiral runner blade.
3. according to claim 1 with the production technology of paraformaldehyde device of anti-blocking pipeline, it is characterized in that: after described fluidized bed dryer, be also provided with sieve apparatus.
4. according to claim 1 with the production technology of paraformaldehyde device of anti-blocking pipeline, it is characterized in that: described formaldehyde evaporation concentration device comprises the first absorption tower, vaporizer, primary separator and second-stage separator, the outlet of described vaporizer is connected with the entrance on primary separator top, primary separator outlet at bottom is connected with second-stage separator upper entrance by pump, and second-stage separator outlet at bottom is connected with mist projection granulating tower by pump; The top of described primary separator and second-stage separator is connected with the entrance of the first bottom, absorption tower by pipeline, and the stage casing on the first absorption tower and top are equipped with the entrance for rare formaldehyde solution that circulates.
5. according to claim 1 with the production technology of paraformaldehyde device of anti-blocking pipeline, it is characterized in that: described device for absorbing tail gas comprises the first absorption tower, second absorption tower and the 3rd absorption tower connecting successively, at the bottom of the tower top on each absorption tower and tower, form circulation line, circulation line is provided with interchanger.
6. according to claim 1 with the production technology of paraformaldehyde device of anti-blocking pipeline, it is characterized in that: the bottom of described cyclonic separator is also provided with worm conveyor, this worm conveyor is connected respectively with top with the middle and lower part of prilling tower with blower fan by pipeline.
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| CN201420402361.4U CN203999471U (en) | 2014-07-21 | 2014-07-21 | A kind ofly be with anti-blocking pipeline production technology of paraformaldehyde device |
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| CN201420402361.4U CN203999471U (en) | 2014-07-21 | 2014-07-21 | A kind ofly be with anti-blocking pipeline production technology of paraformaldehyde device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078570A (en) * | 2018-08-24 | 2018-12-25 | 江西鹏腾实业有限公司 | A kind of continuous evaporation drying and granulating equipment |
| CN113209908A (en) * | 2021-04-30 | 2021-08-06 | 苏州朋众新材料科技有限公司 | Composite powder spray granulation system for thermal barrier coating |
-
2014
- 2014-07-21 CN CN201420402361.4U patent/CN203999471U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078570A (en) * | 2018-08-24 | 2018-12-25 | 江西鹏腾实业有限公司 | A kind of continuous evaporation drying and granulating equipment |
| CN113209908A (en) * | 2021-04-30 | 2021-08-06 | 苏州朋众新材料科技有限公司 | Composite powder spray granulation system for thermal barrier coating |
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Granted publication date: 20141210 Termination date: 20180721 |