CN109557964A - A kind of dcs of high-concentration formaldehyde production line - Google Patents
A kind of dcs of high-concentration formaldehyde production line Download PDFInfo
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- CN109557964A CN109557964A CN201811607161.1A CN201811607161A CN109557964A CN 109557964 A CN109557964 A CN 109557964A CN 201811607161 A CN201811607161 A CN 201811607161A CN 109557964 A CN109557964 A CN 109557964A
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- gas
- methanol
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- control
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 154
- 239000007789 gas Substances 0.000 claims abstract description 66
- 238000010521 absorption reaction Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000003054 catalyst Substances 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000009191 jumping Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical class ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 239000010970 precious metal Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- 239000012495 reaction gas Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000006555 catalytic reaction Methods 0.000 abstract description 2
- 239000002360 explosive Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 238000009834 vaporization Methods 0.000 abstract description 2
- 230000008016 vaporization Effects 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000021050 feed intake Nutrition 0.000 description 1
- 230000001535 kindling effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of dcs of high-concentration formaldehyde production line, it is to be occurred in metal oxidation catalyst using Fixed Bed Gas Phase oxidation reactor, methanol content in air about maintains between 4-10vol%, as methanol content is higher than 10%, the interlocking of system methanol, the safety of guarantee system, some processes solid/liquid/gas reactions lean gas after tolerance reaction after absorption tower absorbs, enter back into process gas circulating system, reduce the oxygen content in process gas, it is avoided that the formation of explosive mixture, another part enters emission control systems, qualified discharge after catalysis burning.Formaldehyde main reactor removes reaction heat, the heat that conduction oil is taken away is for producing steam by vaporization heat absorption heat transfer medium (conduction oil) from reactor.The present invention is matched by the addition of control methanol and air, generates formaldehyde by incomplete oxidation, the additional amount of water is controlled in absorption process, to achieve the purpose that produce high-concentration formaldehyde.
Description
Technical field
The present invention relates to a kind of dcs of high-concentration formaldehyde production line.
Background technique
For former control system there is the state modulators such as flow, temperature, liquid level, oxygen content are unstable, there is methanol to feed intake
Amount fluctuation, the security risks such as oxygen content fluctuation, product content is unstable, and often, the degree of automation is low for driving and parking, influences to produce
Efficiency.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings, provides a kind of safety and environmental protection, improves the highly concentrated of efficiency of combustion
Spend the dcs of formaldehyde production line.
The purpose of the present invention is achieved through the following technical solutions: a kind of distributed AC servo system system of high-concentration formaldehyde production line
System, fresh air enter system by two Fans by the mixture of booster fan and recyclegas, are sent methanol with methanol pump
Enter process units, is injected in air stream by ring-type injector, positioned at the top of preevaporator, the flow of methanol is by a mass flow
It is measured, methanol flow calculates life by process gas flow and methanol flow by a control valve interlocked control, methanol concentration
At air and carbinol mixture enter methanol evaporator, and methanol evaporates in evaporator and preevaporator, and admixture of gas is added
Heat is to 160-180 DEG C；The oxidation of methanol occurs on the catalyst bed in reactor tube side, and 1.4 meters of metal is housed in pipe
Oxide catalyst, in all catalyst tubes, uniformly extract 7 catalyst tubes in thermocouple is added, to its different zones,
The reaction temperature of differential responses height measures, and when temperature occurs abnormal, methanol security system interlocking, reactor shell side fills
Full conduction oil, to remove the part reaction heat that reaction generates, 7 multitube thermocouples in reactor have 9 on every from high to low
A, totally 63 input points, access distributed I/O system by multichannel transmitter, multichannel transmitter makes with receiver pairing
With the temperature of each layer of reactor can be shown, can grasp the service condition of catalyst in time, and reactor shell side is filled with boiling
Conduction oil, to obtain maximum heat transfer efficiency, conduction oil enters thermally conductive oil condenser from reactor shell side by siphon circulation,
Thermally conductive oil vapour condenses in thermally conductive oil condenser becomes liquid, and is recycled into reactor, and gas enters reactor after reaction
Bottom, if temperature is excessively high, methanol system and blower fan system interlock stop jumping simultaneously, and process gas enters in evaporator shell side, gas
Body is cooled to 130-150 DEG C, and gas enters the first absorption tower after then reacting, and finally enters back into second absorption tower, and first inhales
It receives tower to be made of two packing areas and two pieces of valve plates, second absorption tower is made of 17 pieces of bubble cap trays, into the heat on the first absorption tower
After gas mixing is cooling after reaction, the concentration of formaldehyde of tower reactor is 50-60%, and a part of formaldehyde carries out cyclic absorption, another part
Formalin is discharged from the bottom on the first absorption tower, is interlocked by production line control valve and the first absorbing tower liquid-level, to guarantee
The balance of liquid level controls the tower reactor liquid level on the first absorption tower and the flow of final products, the Fu Er of second absorption tower bottom
Malin passes through heat exchanger, and the circulating cooling water cooling of the cooling water coil in second absorption tower on each column plate with pump circulation
But, heat can be moved away, process water is contacted with gas flow counterflow by being added at the top of second absorption tower, passed through flow meters and work
The additional amount of skill water regulating valve interlocked control process water, the flow-rate ratio of the two determines the concentration of the formaldehyde of final products, through second
Lean gas after absorption tower absorbs is divided into two parts, and a part is entered the amount of emission control systems, another part by regulating valve control
Then enter two Fans, the lean gas amount into emission control systems is controlled by oxygen analysis valve, oxygen analysis valve control loop gas
The ratio of body and fresh air, to keep oxygen concentration in fan outlet process gas to be held constant at 10.5-11%；Into row
The tail gas heat exchange in the lean gas and preheater of control system is put, is aoxidized on precious metal catalyst bed, due to lean gas
The complete oxidation in emission control systems reactor releases a large amount of reaction heat, and the temperature of tail gas increases, when exhaust temperature is excessively high
When, in order to protect steady, the methanol system interlock stop jumping of apparatus and operation, the tail gas of discharge in a vapor generator with pot
Furnace water supply heat exchange, subsequently into preheater, after exchanging heat with lean gas, is discharged into atmosphere.
A further improvement of the present invention is that: by the aperture of control booster fan frequency conversion in system, to control fresh sky
The additional amount of gas reaches control oxygen by the lean gas ratio of oxygen analysis valve opening control to blower fan system and emission control systems
The purpose of content, system oxygen content carry out on-line checking by two on-line detectors, and will test result and adjust oxygen analysis
The aperture of valve.
A further improvement of the present invention is that: thermally conductive oil condenser also acts as steam boiler, and generated a large amount of steam supply
It answers chloromethanes workshop, poly workshop and public work freezing unit refrigeration to use, controlled observation equipment is housed on the pipeline of steam,
The controlled observation equipment includes regulating valve, flowmeter, pressure transmitter, and steam control valve controls the pressure of steam.
Compared with the prior art, the present invention has the following advantages: the present invention is matched by the addition of control methanol and air,
Formaldehyde is generated by incomplete oxidation, the additional amount of water is controlled in absorption process, to reach the mesh of production high-concentration formaldehyde
's.
Detailed description of the invention:
Fig. 1 is structural schematic diagram of the invention；
Figure label: 1- booster fan, 2- blower, 3- blower, 4- methanol pump, 5- preevaporator, 6- reactor, 7- are led
Hot oil condenser, the first absorption tower 8-, 9- second absorption tower, 10- preheater, 11- emission control systems reactor, 12- steam
Generator, 13- formaldehyde evaporator, 14- heat exchanger, 15- oxygen analysis valve, 16- formalin pump.
Specific embodiment:
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be to the skill in the embodiment of the present invention
Art scheme is clearly and completely described, it is clear that and described embodiments are some of the embodiments of the present invention, rather than all
Embodiment.The elements and features described in one embodiment of the invention can be with one or more other embodiment party
Elements and features shown in formula combine.It should be noted that being omitted for purposes of clarity, in explanation unrelated to the invention
, the expression and description of component known to persons of ordinary skill in the art and processing.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained under the premise of not making the creative labor, belongs to guarantor of the present invention
The range of shield.
A kind of a kind of embodiment of the dcs of high-concentration formaldehyde production line of the invention as shown in figure 1,
Fresh air enters system by two Fans 2,3 by the mixture of booster fan 1 and recyclegas, passes through control in the present invention
The aperture of 1 frequency conversion of booster fan, to control the additional amount of fresh air, by the control of oxygen analysis valve opening to blower fan system and
The lean gas ratio of emission control systems achieve the purpose that control oxygen content, system oxygen content by two again line detector carry out again
Line detection, and will test the aperture that result adjusts oxygen analysis valve.
Methanol is sent into process units with methanol pump 4, is injected in air stream by ring-type injector, positioned at preevaporator 5
The flow at top, methanol is measured by a mass flowmenter, methanol flow by a control valve interlocked control, methanol concentration by
Process gas flow and methanol flow, which calculate, to be generated, such as methanol flow, methanol concentration, the exception of reaction temperature, blower is occurred and jumped
Situations such as stopping appearance, all methanol systems include pump machine, flow control valve, and controlled valve is interlocked with methanol security system
Stop jumping and closing, air and carbinol mixture enter methanol evaporator 13, and methanol evaporates in evaporator and preevaporator 5, gas
Body mixture is heated to 160-180 DEG C.
The oxidation of methanol occurs on the catalyst bed in 6 tube side of reactor, and 1.4 meters of metal oxide is housed in pipe
Catalyst uniformly extracts in 7 catalyst tubes and thermocouple is added in all catalyst tubes, anti-to its different zones, difference
The reaction temperature of height is answered to measure, when temperature occurs abnormal, the interlocking of methanol security system, reactor shell side is full of thermally conductive
Oil, to remove the part reaction heat that reaction generates, 7 multitube thermocouples in reactor 6 have 9 points on every from high to low,
Totally 63 input points access distributed I/O system by multichannel transmitter, and multichannel transmitter and receiver pairing use, instead
Answering the temperature of each layer of device 6 can show, can grasp the service condition of catalyst in time.
Reactor shell side is filled with the conduction oil of boiling, and to obtain maximum heat transfer efficiency, conduction oil passes through siphon circulation
Enter thermally conductive oil condenser 7 from reactor shell side, thermally conductive oil vapour condenses in thermally conductive oil condenser 7 becomes liquid, and recycles
Into reactor 6, thermally conductive oil condenser 7 also acts as steam boiler, and generated a large amount of steam supply chloromethanes workshop, poly
Workshop and public work freezing unit refrigeration use, and see on the pipeline of steam equipped with controls such as regulating valve, flowmeter, pressure invertings
Equipment is examined, steam control valve controls the pressure of steam.
Gas enters 6 bottom of reactor after reaction, if bottom temp is excessively high, may result in the risk of kindling, therefore set
Interlocking is set, if temperature is excessively high, interlocking stop jumping process gas enters 13 shell side of evaporator simultaneously for methanol system and blower fan system
In, gas is cooled to 130-150 DEG C, and gas enters the first absorption tower 8 after then reacting, and finally enters back into second absorption tower 9.
First absorption tower 8 is made of two packing areas and two pieces of valve plates, and second absorption tower 9 is made of 17 pieces of bubble cap trays, into
Enter after gas mixing is cooling after the thermal response on the first absorption tower 8, the concentration of formaldehyde of tower reactor is 50-60%, and a part of formaldehyde is followed
Ring absorbs, and the formalin of another part is discharged from the bottom on the first absorption tower 8, passes through production line control valve and the first absorption tower
8 level chains control the tower reactor liquid level on the first absorption tower 8 and the flow of final products to ensure that the balance of liquid level.
The formalin pump 10 of 9 bottom of second absorption tower circulates through preevaporator 5 and heat exchanger 14, and through second
The recirculated cooling water of cooling water coil in absorption tower 9 on each column plate is cooling, can move away heat, and process water is inhaled by second
It receives and is added at the top of tower 9, contacted with gas flow counterflow, pass through the addition of flow meters and technique water regulating valve interlocked control process water
Amount, the flow-rate ratio of the two determine the concentration of the formaldehyde of final products.
Lean gas after the absorption of second absorption tower 9 is divided into two parts, and a part enters emission control system by regulating valve control
The amount of system, another part then enter blower 2,3, and the lean gas amount into emission control systems is controlled by oxygen analysis valve 15, oxygen
The ratio of valve 15 control loop gas and fresh air is analyzed, to keep oxygen concentration in fan outlet process gas to keep constant
In 10.5-11%.
It exchanges heat into the tail gas in the lean gas and preheater 10 of emission control systems, it is enterprising in precious metal catalyst bed
Row oxidation, due to lean gas in putting control system reactor 10 complete oxidation, release a large amount of reaction heat, the temperature liter of tail gas
Height, when exhaust temperature is excessively high, in order to protect steady, the methanol system interlock stop jumping of apparatus and operation, the tail gas of discharge
It exchanges heat in steam generator 12 with boiler feedwater, subsequently into preheater 10, after exchanging heat with lean gas, is discharged into atmosphere.
Thermally conductive oil condenser 7 also acts as steam boiler, generated a large amount of steam supplies chloromethanes workshop, poly workshop and
Public work freezes unit refrigeration and uses, and controlled observation equipment is housed on the pipeline of steam, and the controlled observation equipment includes adjusting
Valve, flowmeter, pressure transmitter are saved, steam control valve controls the pressure of steam.
The production of high-concentration formaldehyde is occurred in metal oxidation catalyst using Fixed Bed Gas Phase oxidation reactor, is reacted
Equation are as follows:
CH3OH + 1/2 02 → CH2O + H2O dH=159KJ/mol
Methanol content in air about maintains between 4-10vol%, and if methanol content is higher than 10%, the interlocking of system methanol is protected
The safety of card system, some processes solid/liquid/gas reactions lean gas after tolerance reaction after absorption tower absorbs, enters back into process gas circulation
System reduces the oxygen content in process gas, is avoided that the formation of explosive mixture, and another part enters emission control system
System, qualified discharge after catalysis burning.Formaldehyde main reactor is removed from reactor by vaporization heat absorption heat transfer medium (conduction oil)
Reaction heat, the heat that conduction oil is taken away is for producing steam.
The instrument such as the pressure, liquid level of this system are all made of high-precision transmitter, can be accurate to site pressure and liquid level etc.
Detection, then controlled by associated regulating loop, so that whole system is run smoothly, reliably.
Finally, it should be noted that although the present invention and its advantage have been described in detail above it should be appreciated that not
Can be carried out in the case where beyond the spirit and scope of the present invention being defined by the claims appended hereto various changes, substitution and
Transformation.Moreover, the scope of the present invention is not limited only to the specific reality of process, equipment described in specification, means, method and steps
Apply example.One of ordinary skilled in the art holds from the disclosure it will be readily understood that can be used according to the present invention
The capable function of communicating substantially to corresponding embodiment described herein obtains and its result communicated substantially, existing and future
Process, equipment, means, method or step to be developed.Therefore, the attached claims are intended to wrap in the range of them
Include such process, equipment, means, method or step.
Claims (3)
1. a kind of dcs of high-concentration formaldehyde production line, it is characterised in that: fresh air passes through booster fan (1)
Enter system by two Fans (2,3) with the mixture of recyclegas, methanol is sent into process units with methanol pump (4), is passed through
Ring-type injector injects in air stream, is located at the top of preevaporator (5), and the flow of methanol is measured by a mass flowmenter,
Methanol flow is calculated by process gas flow and methanol flow and is generated by a control valve interlocked control, methanol concentration, air and first
Alcohol mixture enters methanol evaporator (13), and methanol evaporation, admixture of gas in evaporator and preevaporator (5) are heated to
160-180℃；The oxidation of methanol occurs on the catalyst bed in reactor (6) tube side, and 1.4 meters of metal oxygen is housed in pipe
Compound catalyst uniformly extracts in 7 catalyst tubes and thermocouple is added, to its different zones, no in all catalyst tubes
Reaction temperature with reaction height measures, and when temperature occurs abnormal, methanol security system interlocking, reactor shell side is full of
Conduction oil, to remove the part reaction heat that reaction generates, 7 multitube thermocouples in reactor (6) have from high to low on every
9 points, totally 63 input points, access distributed I/O system by multichannel transmitter, multichannel transmitter makes with receiver pairing
With the temperature of reactor (6) each layer can be shown, can grasp the service condition of catalyst in time, and reactor shell side is filled with
The conduction oil of boiling, to obtain maximum heat transfer efficiency, it is cold that conduction oil by siphon circulation enters conduction oil from reactor shell side
Condenser (7), the condensation in thermally conductive oil condenser (7) of thermally conductive oil vapour becomes liquid, and is recycled into reactor (6), after reaction
Gas enters reactor (6) bottom, if temperature is excessively high, methanol system and blower fan system interlock stop jumping simultaneously, process gas into
Enter in evaporator (13) shell side, gas is cooled to 130-150 DEG C, and gas enters the first absorption tower (8) after then reacting, finally
It enters back into second absorption tower (9), the first absorption tower (8) are made of two packing areas and two pieces of valve plates, and second absorption tower (9) is by 17
Block bubble cap tray composition, into the thermal response of the first absorption tower (8) after gas mixing it is cooling after, the concentration of formaldehyde of tower reactor is 50-
60%, a part of formaldehyde carries out cyclic absorption, and the formalin of another part is discharged from the bottom of the first absorption tower (8), passes through life
Producing line regulating valve and the first absorption tower (8) level chain control the tower of the first absorption tower (8) to ensure that the balance of liquid level
The formalin of the flow of kettle liquid position and final products, second absorption tower (9) bottom circulates through heat exchanger with pump (16)
(14), the recirculated cooling water of the cooling water coil and in second absorption tower (9) on each column plate is cooling, can move away heat
Amount, process water are contacted with gas flow counterflow, are joined by flow meters and technique water regulating valve by being added at the top of second absorption tower (9)
The additional amount of lock control process water, the flow-rate ratio of the two determine the concentration of the formaldehyde of final products, absorb through second absorption tower (9)
Lean gas afterwards is divided into two parts, and a part is entered the amount of emission control systems by regulating valve control, and another part then enters blower
(2,3), the lean gas amount into emission control systems are controlled by oxygen analysis valve, oxygen analysis valve control loop gas and fresh sky
The ratio of gas, to keep oxygen concentration in fan outlet process gas to be held constant at 10.5-11%；Into emission control systems
Lean gas and preheater (10) in tail gas exchange heat, aoxidized on precious metal catalyst bed, since lean gas is discharging
Complete oxidation in control system reactor (11) releases a large amount of reaction heat, and the temperature of tail gas increases, when exhaust temperature is excessively high
When, in order to protect steady, the methanol system interlock stop jumping of apparatus and operation, the tail gas of discharge is in steam generator (12)
It exchanges heat with boiler feedwater, is discharged into atmosphere after exchanging heat with lean gas subsequently into preheater (10).
2. a kind of dcs of highly concentrated plain formaldehyde production line according to claim 1, it is characterised in that: the system
Oxygen analysis valve opening control is passed through to control the additional amount of fresh air by the aperture of control booster fan (1) frequency conversion in system
The lean gas ratio for making blower fan system and emission control systems achievees the purpose that control oxygen content, system oxygen content by two
Line detector carries out on-line checking, and will test the aperture that result adjusts oxygen analysis valve.
3. a kind of dcs of highly concentrated plain formaldehyde production line according to claim 1, it is characterised in that: described to lead
Hot oil condenser (7) also acts as steam boiler, generated a large amount of steam supplies chloromethanes workshop, poly workshop and public work
It freezes unit refrigeration to use, controlled observation equipment is housed, the controlled observation equipment includes regulating valve, flow on the pipeline of steam
Meter, pressure transmitter, steam control valve control the pressure of steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607161.1A CN109557964B (en) | 2018-12-27 | 2018-12-27 | Distributed control system of high-concentration formaldehyde production line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607161.1A CN109557964B (en) | 2018-12-27 | 2018-12-27 | Distributed control system of high-concentration formaldehyde production line |
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| Publication Number | Publication Date |
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| CN109557964A true CN109557964A (en) | 2019-04-02 |
| CN109557964B CN109557964B (en) | 2020-09-29 |
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| CN201811607161.1A Active CN109557964B (en) | 2018-12-27 | 2018-12-27 | Distributed control system of high-concentration formaldehyde production line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111240384A (en) * | 2020-02-28 | 2020-06-05 | 晶澳（邢台）太阳能有限公司 | Scaling powder adjusting device and method |
| CN111559960A (en) * | 2020-04-27 | 2020-08-21 | 西安市尚华科技开发有限责任公司 | System and method for preparing anhydrous formaldehyde from methanol |
| CN113636925A (en) * | 2020-04-27 | 2021-11-12 | 西安市尚华科技开发有限责任公司 | System and method for preparing high-concentration formaldehyde from methylal |
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| CN113636925A (en) * | 2020-04-27 | 2021-11-12 | 西安市尚华科技开发有限责任公司 | System and method for preparing high-concentration formaldehyde from methylal |
| CN111559960B (en) * | 2020-04-27 | 2023-04-14 | 西安市尚华科技开发有限责任公司 | System and method for preparing anhydrous formaldehyde from methanol |
| CN113636925B (en) * | 2020-04-27 | 2024-04-30 | 西安市尚华科技开发有限责任公司 | System and method for preparing high-concentration formaldehyde from methylal |
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