CN114643028A - Formaldehyde production device based on DCS control system - Google Patents
Formaldehyde production device based on DCS control system Download PDFInfo
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- CN114643028A CN114643028A CN202011505675.3A CN202011505675A CN114643028A CN 114643028 A CN114643028 A CN 114643028A CN 202011505675 A CN202011505675 A CN 202011505675A CN 114643028 A CN114643028 A CN 114643028A
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- formaldehyde
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 207
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 230000007246 mechanism Effects 0.000 claims abstract description 40
- 239000007921 spray Substances 0.000 claims abstract description 20
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 14
- 239000002351 wastewater Substances 0.000 claims description 36
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 5
- 230000000151 anti-reflux effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 8
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 25
- 230000002265 prevention Effects 0.000 description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- MGJURKDLIJVDEO-UHFFFAOYSA-N formaldehyde;hydrate Chemical compound O.O=C MGJURKDLIJVDEO-UHFFFAOYSA-N 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- DSMZRNNAYQIMOM-UHFFFAOYSA-N iron molybdenum Chemical compound [Fe].[Fe].[Mo] DSMZRNNAYQIMOM-UHFFFAOYSA-N 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 230000000622 irritating effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
- B01J2219/00056—Controlling or regulating the heat exchange system involving measured parameters
- B01J2219/00058—Temperature measurement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00132—Controlling the temperature using electric heating or cooling elements
- B01J2219/00135—Electric resistance heaters
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Abstract
The invention discloses a formaldehyde production device based on a DCS (distributed control system), which comprises a fixing mechanism, a spray tower, a wastewater treatment mechanism and a circulating mechanism, wherein the spray tower is arranged on the fixed mechanism; this scheme, through formaldehyde concentration detector, temperature sensor and pressure sensor detect the formaldehyde concentration of tower body inner chamber aqueous solution respectively, gaseous temperature and gaseous pressure data, carry out analysis processes with data transmission to the PLC controller, when formaldehyde concentration reaches the default in the aqueous solution, open first water pump, take out the high concentration aqueous solution of tower body inner chamber through the second waste pipe, take out the back, open first solenoid valve, reinject the clear water, then open the second solenoid valve, make tail gas enter into the inner chamber to the tower body through preventing the back flow, can in time effectually discharge high concentration aqueous solution, and then improved treatment effeciency greatly, when the temperature is low excessively, through switching on the heater strip, can heat the aqueous solution, and then strengthen the dissolving capacity of formaldehyde, and the treatment effect is improved.
Description
Technical Field
The invention relates to the technical field of formaldehyde production processes, in particular to a formaldehyde production device based on a DCS (distributed control system).
Background
Formaldehyde is an organic chemical of the formula HCHO or CH2O, molecular weight 30.03, also known as formil. Is colorless and has irritant gas, and has irritant effect on eyes and nose. Gas relative density 1.067 (air 1), liquid density 0.815g/cm3(-20 ℃ C.). Melting point-92 deg.C, boiling point-19.5 deg.C. Is easily soluble in water and ethanol. Aqueous solutions, up to 55% strength, typically 35% to 40%, usually 37%, are known as formalin, commonly known as formalin. Has reducibility, and particularly has stronger reducibility in alkaline aqueous solution. Can be burnt, the steam and air form explosive mixture, the explosion limit is 7-73% (volume), and the ignition point is about 300 ℃. Can be prepared by dehydrogenation or oxidation of methanol under the catalysis of metals such as silver, copper and the like, and can also be separated from hydrocarbon oxidation products. Can be used as raw materials of phenolic resin, urea-formaldehyde resin, vinylon, urotropine, pentaerythritol, dye, pesticide, disinfectant and the like. The aqueous solution of industrial formaldehyde generally contains 37% formaldehyde and 15% methanol as polymerization inhibitors and has a boiling point of 101 ℃.
At present, formaldehyde is almost prepared by adopting a methanol air oxidation method. The production method can be divided into 2 production methods of an iron-molybdenum catalyst method and a silver catalyst method according to different types of the used catalysts.
Formaldehyde need use the circulation and spray the absorption tower in the preparation process, the circulation spray tower can be handled the tail gas of formaldehyde, absorb the formaldehyde in the tail gas, however traditional circulation sprays the absorption tower in the course of the work, the water absorbs the formaldehyde back inefficiency, water is absorbing behind the formaldehyde of certain concentration, absorption efficiency greatly reduced, if can not be timely with the waste water discharge of high concentration, change the clear water again, the treatment effeciency of reduction tail gas that can be very big.
Disclosure of Invention
The invention aims to provide a formaldehyde production device based on a DCS (distributed control system) to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a formaldehyde apparatus for producing based on DCS control system includes: the device comprises a fixing mechanism, a spray tower, a wastewater treatment mechanism and a circulating mechanism, wherein the spray tower is fixedly arranged at the top of the fixing mechanism, the wastewater treatment mechanism is fixedly arranged at one side of the top of the fixing mechanism, and the circulating mechanism is fixedly arranged at one side of the spray tower;
the fixing mechanism comprises a base, a support column is welded at the top of the base, and a fixing sleeve is welded at the top of the support column;
the spray tower comprises a tower body, the tower body is fixedly arranged in an inner cavity of a fixed sleeve, the top of the tower body is communicated with a water injection pipe, the surface of the water injection pipe is provided with a first electromagnetic valve, the bottom of the tower body and one side far away from the wastewater treatment mechanism are communicated with a backflow prevention pipe, one end of the backflow prevention pipe far away from the tower body is communicated with a tail gas inlet pipe, the surface of the tail gas inlet pipe is provided with a second electromagnetic valve, the bottom of the inner cavity of the tower body is welded with a gas outlet seat, the inside of the gas outlet seat is provided with a cavity, the top of the gas outlet seat is provided with a gas outlet hole, the top of the inner cavity of the tower body is sequentially and fixedly provided with a first filling layer, a second filling layer and a third filling layer from top to bottom, the side wall of the tower body is fixedly provided with a temperature sensor between the first filling layer and the second filling layer, and the side wall of the tower body is fixedly provided with a pressure sensor between the second filling layer and the third filling layer, a fixed rod is welded at the bottom of the inner cavity of the tower body and at the top of the air outlet seat, a heating wire is sleeved on the surface of the fixed rod, and a formaldehyde concentration detector is fixedly arranged on one side of the bottom of the tower body;
the wastewater treatment mechanism comprises a wastewater tank and a first water pump, the first water pump is fixedly installed at the bottom of the tower body, one side, close to the tower body, of the wastewater tank is communicated with a first wastewater pipe, the water pumping end of the first water pump is communicated with a second wastewater pipe, the water outlet of the first water pump is communicated with one end, far away from the wastewater tank, of the first wastewater pipe, the bottom, far away from the tower body, of the wastewater tank is communicated with a water outlet pipe, and the surface of the water outlet pipe is provided with a third electromagnetic valve;
the circulation mechanism comprises a second water pump, the second water pump is fixedly installed on one side, away from the backflow prevention pipe, of the tower body, the water pumping end of the second water pump is communicated with a first circulation pipe, the water outlet of the second water pump is communicated with a second circulation pipe, and one side, close to the tower body, of the second circulation pipe is communicated with a first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe from top to bottom respectively.
By adopting the technical scheme, the formaldehyde concentration detector, the temperature sensor and the pressure sensor are used for respectively detecting the formaldehyde concentration of the water solution in the inner cavity of the tower body, the temperature of the gas and the pressure data of the gas, the data are transmitted to the PLC for analysis and processing, when the concentration of formaldehyde in the aqueous solution reaches a preset value, a first water pump is started, the high-concentration aqueous solution in the inner cavity of the tower body is pumped out through a second waste water pipe, after the high-concentration aqueous solution is pumped out, a first electromagnetic valve is started, clean water is injected again, then the second electromagnetic valve is opened to lead the tail gas to enter the inner cavity of the tower body through the backflow prevention pipe, the high-concentration water solution can be effectively discharged in time, and then improved the treatment effeciency greatly, when the temperature is low excessively, through to the heater strip circular telegram, the heater strip is located the aqueous solution, can heat the aqueous solution, and then strengthens the dissolving capacity of formaldehyde, improves the treatment effect.
Preferably, the one end that the anti-reflux pipe is close to the tower body runs through tower body and play gas holder in proper order, anti-reflux pipe and play gas holder intercommunication.
By adopting the technical scheme, the bending part of the backflow-preventing pipe is higher than the height of the water solution in the inner cavity of the tower body, so that the liquid in the inner cavity of the tower body flows back to the inner cavity of the tail gas inlet pipe when the gas is not ventilated.
Preferably, the diameters and the lengths of the fourth branch pipe, the third branch pipe, the second branch pipe and the first branch pipe are consistent.
Preferably, air outlet holes are formed in the tops of the fourth branch pipe, the third branch pipe, the second branch pipe and the first branch pipe, and the number of the air outlet holes is not less than five.
Through adopting above-mentioned technical scheme, can realize the purpose of layering water spray, and then make the gaseous abundant basis of water and tower body inner chamber, strengthened the treatment effect greatly.
Preferably, the number of the air outlet holes is a plurality, and the air outlet holes are uniformly arranged at the top of the air outlet seat.
Through adopting above-mentioned technical scheme, can directly discharge tail gas, contact with the aqueous solution of tower body inner chamber bottom, improve the absorption effect.
Preferably, the tower body and the logical groove are run through in proper order to the one end that the second waste pipe is close to the tower body, the second waste pipe is linked together with the tower body.
Through adopting above-mentioned technical scheme, can take out the aqueous solution of tower body inner chamber.
Preferably, the contact of the formaldehyde concentration detector penetrates through the tower body.
Through adopting above-mentioned technical scheme, can realize the detection to tower body inner chamber aqueous solution formaldehyde concentration through the contact.
Preferably, the second branch pipe is located at the bottom of the first filling layer, the third branch pipe is located at the bottom of the second filling layer, and the fourth branch pipe is located at the bottom of the third filling layer.
Through adopting above-mentioned technical scheme, fourth branch pipe, third branch pipe and second branch pipe can make spun moisture reposition of redundant personnel, very big increase the area of contact of water with gas, further improvement absorption efficiency.
Preferably, one end of the first circulating pipe, which is far away from the second water pump, penetrates through the tower body, and the first circulating pipe is communicated with the tower body.
Through adopting above-mentioned technical scheme, can take out the aqueous solution of tower body inner chamber, rethread fourth branch pipe, third branch pipe, second branch pipe and first branch pipe blowout, realize endless purpose.
Preferably, the positive fixed surface of tower body installs the PLC controller, first solenoid valve, second solenoid valve, temperature sensor, pressure sensor, formaldehyde concentration detector, first water pump, outlet pipe, third solenoid valve and second water pump all with PLC controller electric connection.
Through adopting above-mentioned technical scheme, can detect the formaldehyde concentration of tower body inner chamber aqueous solution, gaseous temperature and gaseous pressure data respectively through formaldehyde concentration detector, temperature sensor and pressure sensor, through the injection of first solenoid valve control clear water, take the aqueous solution of tower body inner chamber out through first water pump, realize the circulation of water through the second water pump, through the injection of second solenoid valve control tail gas, heat the aqueous solution through the heater wire, can discharge waste water through the third solenoid valve, control through the PLC controller first solenoid valve, second solenoid valve, temperature sensor, pressure sensor, formaldehyde concentration detector, first water pump, outlet pipe, the operating condition of third solenoid valve and second water pump.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the formaldehyde concentration, the gas temperature and the gas pressure data of the water solution in the inner cavity of the tower body are respectively detected by the formaldehyde concentration detector, the temperature sensor and the pressure sensor, the data are transmitted to the PLC for analysis and treatment, when the formaldehyde concentration in the water solution reaches a preset value, the first water pump is started, the high-concentration water solution in the inner cavity of the tower body is pumped out through the second waste water pipe, after the high-concentration water solution is pumped out, the first electromagnetic valve is started, clear water is injected again, then the second electromagnetic valve is started, tail gas enters the inner cavity of the tower body through the backflow prevention pipe, the high-concentration water solution can be effectively discharged in time, the treatment efficiency is greatly improved, when the temperature is too low, the heating wire is electrified and positioned in the water solution, the water solution can be heated, the formaldehyde dissolving capacity is further enhanced, and the treatment effect is improved.
Drawings
FIG. 1 is a schematic view of the structure of a formaldehyde production apparatus of the present invention;
FIG. 2 is a schematic sectional view of the upper half of the formaldehyde production apparatus of the present invention;
FIG. 3 is a schematic sectional view of the lower half of the formaldehyde production apparatus of the present invention;
FIG. 4 is an enlarged view of a portion of A of FIG. 3 according to the present invention;
FIG. 5 is a schematic top view of the structure of the outlet base of the formaldehyde production apparatus of the present invention;
FIG. 6 is a schematic structural view of a heater wire of the formaldehyde production apparatus of the present invention.
In the figure: 1. a fixing mechanism; 2. a spray tower; 3. a wastewater treatment mechanism; 4. a circulating mechanism; 5. a PLC controller; 11. a base; 12. a pillar; 13. fixing a sleeve; 21. a tower body; 22. a water injection pipe; 23. a first solenoid valve; 24. a second solenoid valve; 25. introducing tail gas into a pipe; 26. a first filling layer; 27. a temperature sensor; 28. a second filling layer; 29. a pressure sensor; 210. a third filling layer; 211. a formaldehyde concentration detector; 212. an air outlet seat; 213. a backflow prevention pipe; 214. a cavity; 215. an air outlet; 216. a through groove; 217. fixing the rod; 218. heating wires; 31. a wastewater tank; 32. a first wastewater pipe; 33. a first water pump; 34. a water outlet pipe; 35. a third electromagnetic valve; 36. a second waste pipe; 41. a first circulation pipe; 42. a second water pump; 43. a fourth branch pipe; 44. a second circulation pipe; 45. a third branch pipe; 46. a second branch pipe; 47. a first branch pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution:
a formaldehyde apparatus for producing based on DCS control system includes: the device comprises a fixing mechanism 1, a spray tower 2, a wastewater treatment mechanism 3 and a circulating mechanism 4, wherein the spray tower 2 is fixedly arranged at the top of the fixing mechanism 1, the wastewater treatment mechanism 3 is fixedly arranged at one side of the top of the fixing mechanism 1, the circulating mechanism 4 is fixedly arranged at one side of the spray tower 2, a PLC (programmable logic controller) 5 is fixedly arranged on the front surface of the tower body 21, a first electromagnetic valve 23, a second electromagnetic valve 24, a temperature sensor 27, a pressure sensor 29, a formaldehyde concentration detector 211, a first water pump 33, a water outlet pipe 34, a third electromagnetic valve 35 and a second water pump 42 are electrically connected with the PLC 5, the formaldehyde concentration detector 211, the temperature sensor 27 and the pressure sensor 29 can respectively detect the formaldehyde concentration, the gas temperature and the gas pressure data of the water solution in the inner cavity of the tower body 21, the injection of clean water is controlled by the first electromagnetic valve 23, the water solution in the inner cavity of the tower body 21 is pumped out by the first water pump 33, the circulation of water is realized through the second water pump 42, the injection of tail gas is controlled through the second electromagnetic valve 24, the water solution is heated through the heating wire 218, the wastewater can be discharged through the third electromagnetic valve 35, and the working states of the first electromagnetic valve 23, the second electromagnetic valve 24, the temperature sensor 27, the pressure sensor 29, the formaldehyde concentration detector 211, the first water pump 33, the water outlet pipe 34, the third electromagnetic valve 35 and the second water pump 42 are controlled through the PLC 5.
The fixing mechanism 1 comprises a base 11, a support column 12 is welded on the top of the base 11, and a fixing sleeve 13 is welded on the top of the support column 12.
The spray tower 2 comprises a tower body 21, the tower body 21 is fixedly arranged in an inner cavity of a fixed sleeve 13, the top of the tower body 21 is communicated with a water injection pipe 22, the surface of the water injection pipe 22 is provided with a first electromagnetic valve 23, the bottom of the tower body 21 and one side far away from the wastewater treatment mechanism 3 are communicated with a backflow prevention pipe 213, one end of the backflow prevention pipe 213 close to the tower body 21 sequentially penetrates through the tower body 21 and an air outlet base 212, the backflow prevention pipe 213 is communicated with the air outlet base 212, the bending part of the backflow prevention pipe 213 is higher than the height of the aqueous solution in the inner cavity of the tower body 21, so that the situation that the liquid in the inner cavity of the tower body 21 flows back to the inner cavity of the tail gas inlet pipe 25 when the air is not ventilated can be avoided, one end of the backflow prevention pipe 213 far away from the tower body 21 is communicated with the tail gas inlet pipe 25, the surface of the tail gas inlet pipe 25 is provided with a second electromagnetic valve 24, the bottom of the inner cavity of the tower body 21 is welded with the air outlet base 212, the cavity 214 is arranged in the air outlet base 212, and the top of the air outlet base 215 is arranged, the number of the air outlet holes 215 is a plurality, and the air outlet holes 215 are uniformly arranged at the top of the air outlet base 212, so that tail gas can be directly discharged to be contacted with a water solution at the bottom of an inner cavity of the tower body 21, thereby improving the absorption effect, the top of the inner cavity of the tower body 21 is fixedly provided with a first filling layer 26, a second filling layer 28 and a third filling layer 210 from top to bottom in sequence, a temperature sensor 27 is fixedly arranged on the side wall of the tower body 21 and between the first filling layer 26 and the second filling layer 28, a pressure sensor 29 is fixedly arranged on the side wall of the tower body 21 and between the second filling layer 28 and the third filling layer 210, a fixing rod 217 is welded at the bottom of the inner cavity of the tower body 21 and at the top of the air outlet base 212, a heating wire 218 is sleeved on the surface of the fixing rod 217, a formaldehyde concentration detector 211 is fixedly arranged on one side of the bottom of the tower body 21, a contact of the formaldehyde concentration detector 211 penetrates through the tower body 21, can realize the detection to tower body 21 inner chamber aqueous solution formaldehyde concentration through the contact.
The wastewater treatment mechanism 3 comprises a wastewater tank 31 and a first water pump 33, the first water pump 33 is fixedly installed at the bottom of the tower body 21, one side, close to the tower body 21, of the wastewater tank 31 is communicated with a first wastewater pipe 32, the water pumping end of the first water pump 33 is communicated with a second wastewater pipe 36, one end, close to the tower body 21, of the second wastewater pipe 36 sequentially penetrates through the tower body 21 and the through groove 216, the second wastewater pipe 36 is communicated with the tower body 21, the water solution in the inner cavity of the tower body 21 can be pumped out, the water outlet of the first water pump 33 is communicated with one end, far away from the wastewater tank 31, of the first wastewater pipe 32, the bottom, far away from the tower body 21, of the wastewater tank 31 is communicated with a water outlet pipe 34, and the surface of the water outlet pipe 34 is provided with a third electromagnetic valve 35.
The circulating mechanism 4 comprises a second water pump 42, the second water pump 42 is fixedly arranged on one side of the tower body 21 far away from the backflow prevention pipe 213, the water pumping end of the second water pump 42 is communicated with a first circulating pipe 41, one end of the first circulating pipe 41 far away from the second water pump 42 penetrates through the tower body 21, the first circulating pipe 41 is communicated with the tower body 21 and can pump out the aqueous solution in the inner cavity of the tower body 21 and then is sprayed out through a fourth branch pipe 43, a third branch pipe 45, a second branch pipe 46 and a first branch pipe 47, the circulating purpose is realized, the water outlet of the second water pump 42 is communicated with a second circulating pipe 44, one side of the second circulating pipe 44 close to the tower body 21 is respectively communicated with a first branch pipe 47, a second branch pipe 46, a third branch pipe 45 and a fourth branch pipe 43 from top to bottom, the diameters and the lengths of the fourth branch pipe 43, the third branch pipe 45, the second branch pipe 46 and the first branch pipe 47 are consistent, the tops of the fourth branch pipe 43, the third branch pipe 45, the second branch pipe 46 and the first branch pipe 47 are provided with air outlet holes, five is no less than to the quantity of venthole, can realize the purpose of layering water spray, and then make the gaseous abundant basis of water and tower body 21 inner chamber, the treatment effect has been strengthened greatly, second branch pipe 46 is located the bottom of first filling layer 26, third branch pipe 45 is located the bottom of second filling layer 28, fourth branch pipe 43 is located the bottom of third filling layer 210, fourth branch pipe 43, third branch pipe 45 and second branch pipe 46 can make spun moisture flow, very big increase the area of contact of water with gas, further improvement absorption efficiency.
By adopting the technical scheme, the formaldehyde concentration detector 211, the temperature sensor 27 and the pressure sensor 29 are used for respectively detecting the formaldehyde concentration, the gas temperature and the gas pressure data of the water solution in the inner cavity of the tower body 21, the data are transmitted to the PLC 5 for analysis and processing, when the formaldehyde concentration in the water solution reaches a preset value, the first water pump 33 is started, the high-concentration water solution in the inner cavity of the tower body 21 is pumped out through the second waste water pipe 36, after the high-concentration water solution is pumped out, the first electromagnetic valve 23 is started, clean water is injected again, then the second electromagnetic valve 24 is started, tail gas enters the inner cavity of the tower body 21 through the backflow prevention pipe 213, the high-concentration water solution can be effectively discharged in time, the processing efficiency is greatly improved, when the temperature is too low, the heating wire 218 is electrified, the heating wire 218 is positioned in the water solution, the water solution can be heated, and the formaldehyde dissolving capacity is enhanced, the treatment effect is improved.
The structure principle is as follows: by controlling the first electromagnetic valve 23 to be opened, clean water is injected into the inner cavity of the tower body 21 through the water injection pipe 22, when the clean water passes through the heating wire 2185-10cm, the first electromagnetic valve 23 is closed, then tail gas is injected into the inner cavity of the tower body 21 through the second electromagnetic valve 24, the tail gas enters the inner cavity of the gas outlet base 212 through the backflow prevention pipe 213 and is discharged into the clean water through the gas outlet hole 215 at the top of the gas outlet base 212, so that the clean water and the tail gas are absorbed for the first time, after the tail gas is injected, the pressure of the inner cavity of the tower body 21 is increased, the pressure sensor 29 monitors the pressure of the inner cavity of the tower body 21 in real time, when the pressure reaches a preset value, the PLC controller 5 controls the second electromagnetic valve 24 to be closed, at the moment, the PLC controller 5 controls the second water pump 42 to be opened, the clean water is pumped out by the second water pump 42 through the first circulating pipe 41, and then is discharged through the fourth branch pipe 43, the third branch pipe 45, the second branch pipe 46 and the first branch pipe 47 at one side of the second circulating pipe 44, the water flow is respectively sprayed to the top of the tower body 21, the first filling layer 26, the second filling layer 28 and the third filling layer 210, which can greatly disperse water, so as to increase the contact area between the tail gas and the water in the inner cavity of the tower body 21 and realize the circulation of the water flow, when the temperature of the inner cavity of the tower body 21 is lower than a preset value, the PLC 5 energizes the heater wire 218, the heater wire 218 heats the water, the formaldehyde solubility is improved, the absorption of the formaldehyde in the tail gas is increased, when the formaldehyde concentration detector 211 detects that the concentration reaches a certain value, the formaldehyde solubility in the water is greatly reduced, by starting the first water pump 33, the first water pump 33 pumps the high-concentration formaldehyde water solution in the inner cavity of the tower body 21 through the second waste water pipe 36, the first waste water pipe 32 discharges into the inner cavity of the waste water tank 31, at the moment, the inner cavity of the tower body 21 is in a negative pressure state, when the pressure of the inner cavity of the tower body 21 is preset value, at this time, the first water pump 33 is closed, the first electromagnetic valve 23 is opened again, a cycle is realized, the high-concentration aqueous solution can be timely treated, the clear water is replaced, the treatment efficiency is further improved, and when necessary, the third electromagnetic valve 35 is opened through the PLC 5 to treat the aqueous solution.
The parts not involved in the present invention are the same as or can be implemented by the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a formaldehyde apparatus for producing based on DCS control system which characterized in that includes: the device comprises a fixing mechanism (1), a spray tower (2), a wastewater treatment mechanism (3) and a circulation mechanism (4), wherein the spray tower (2) is fixedly installed at the top of the fixing mechanism (1), the wastewater treatment mechanism (3) is fixedly installed at one side of the top of the fixing mechanism (1), and the circulation mechanism (4) is fixedly installed at one side of the spray tower (2);
the fixing mechanism (1) comprises a base (11), a strut (12) is welded at the top of the base (11), and a fixing sleeve (13) is welded at the top of the strut (12);
spray column (2) are including tower body (21), tower body (21) fixed mounting is in the inner chamber of fixed cover (13), the top intercommunication of tower body (21) has water injection pipe (22), the surface of water injection pipe (22) is provided with first solenoid valve (23), one side intercommunication that waste water treatment mechanism (3) were just kept away from in the bottom of tower body (21) has anti-return pipe (213), the one end intercommunication that tower body (21) were kept away from in anti-return pipe (213) has tail gas to advance pipe (25), the surface that tail gas advances pipe (25) is provided with second solenoid valve (24), the bottom welding of tower body (21) inner chamber has gas outlet seat (212), cavity (214) have been seted up to the inside of gas outlet seat (212), venthole (215) have been seted up at the top of gas outlet seat (212), the top of tower body (21) inner chamber is extremely down from last fixed mounting in proper order down has first filling layer (26), The device comprises a second filling layer (28) and a third filling layer (210), wherein a temperature sensor (27) is fixedly installed on the side wall of the tower body (21) and positioned between the first filling layer (26) and the second filling layer (28), a pressure sensor (29) is fixedly installed on the side wall of the tower body (21) and positioned between the second filling layer (28) and the third filling layer (210), a fixing rod (217) is welded at the bottom of an inner cavity of the tower body (21) and positioned at the top of an air outlet seat (212), a heating wire (218) is sleeved on the surface of the fixing rod (217), and a formaldehyde concentration detector (211) is fixedly installed on one side of the bottom of the tower body (21);
the wastewater treatment mechanism (3) comprises a wastewater tank (31) and a first water pump (33), the first water pump (33) is fixedly installed at the bottom of the tower body (21), one side, close to the tower body (21), of the wastewater tank (31) is communicated with a first wastewater pipe (32), the water pumping end of the first water pump (33) is communicated with a second wastewater pipe (36), the water outlet of the first water pump (33) is communicated with one end, far away from the wastewater tank (31), of the first wastewater pipe (32), the bottom, far away from the tower body (21), of the wastewater tank (31) is communicated with a water outlet pipe (34), and the surface of the water outlet pipe (34) is provided with a third electromagnetic valve (35);
circulation mechanism (4) include second water pump (42), second water pump (42) fixed mounting is in one side that anti-reflux pipe (213) were kept away from in tower body (21), the end intercommunication that draws water of second water pump (42) has first circulating pipe (41), the play water intercommunication of second water pump (42) has second circulating pipe (44), one side that second circulating pipe (44) are close to tower body (21) is from last to communicating respectively down first branch pipe (47), second branch pipe (46), third branch pipe (45) and fourth branch pipe (43).
2. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: the anti-backflow pipe (213) is close to one end of the tower body (21) and penetrates through the tower body (21) and the air outlet base (212) in sequence, and the anti-backflow pipe (213) is communicated with the air outlet base (212).
3. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: the diameters and the lengths of the fourth branch pipe (43), the third branch pipe (45), the second branch pipe (46) and the first branch pipe (47) are consistent.
4. The formaldehyde production plant based on DCS control system of claim 3, characterized in that: and air outlet holes are formed in the tops of the fourth branch pipe (43), the third branch pipe (45), the second branch pipe (46) and the first branch pipe (47), and the number of the air outlet holes is not less than five.
5. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: the number of the air outlet holes (215) is a plurality, and the air outlet holes (215) are uniformly arranged at the top of the air outlet seat (212).
6. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: one end, close to the tower body (21), of the second waste water pipe (36) penetrates through the tower body (21) and the through groove (216) in sequence, and the second waste water pipe (36) is communicated with the tower body (21).
7. The formaldehyde production device based on the DCS control system according to claim 1, wherein: and a contact of the formaldehyde concentration detector (211) penetrates through the tower body (21).
8. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: the second branch pipe (46) is positioned at the bottom of the first filling layer (26), the third branch pipe (45) is positioned at the bottom of the second filling layer (28), and the fourth branch pipe (43) is positioned at the bottom of the third filling layer (210).
9. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: one end of the first circulating pipe (41) far away from the second water pump (42) penetrates through the tower body (21), and the first circulating pipe (41) is communicated with the tower body (21).
10. The formaldehyde production plant based on DCS control system of claim 1, characterized in that: the positive fixed surface of tower body (21) installs PLC controller (5), first solenoid valve (23), second solenoid valve (24), temperature sensor (27), pressure sensor (29), formaldehyde concentration detection appearance (211), first water pump (33), outlet pipe (34), third solenoid valve (35) and second water pump (42) all with PLC controller (5) electric connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011505675.3A CN114643028A (en) | 2020-12-18 | 2020-12-18 | Formaldehyde production device based on DCS control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011505675.3A CN114643028A (en) | 2020-12-18 | 2020-12-18 | Formaldehyde production device based on DCS control system |
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| CN114643028A true CN114643028A (en) | 2022-06-21 |
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