CN2386046Y - Automatic control device for acid inlet amount of quench tower in acrylonitrile process - Google Patents
Automatic control device for acid inlet amount of quench tower in acrylonitrile process Download PDFInfo
- Publication number
- CN2386046Y CN2386046Y CN 98250812 CN98250812U CN2386046Y CN 2386046 Y CN2386046 Y CN 2386046Y CN 98250812 CN98250812 CN 98250812 CN 98250812 U CN98250812 U CN 98250812U CN 2386046 Y CN2386046 Y CN 2386046Y
- Authority
- CN
- China
- Prior art keywords
- acrylonitrile
- control device
- quench tower
- automatic control
- dcs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000010791 quenching Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 15
- 230000008569 process Effects 0.000 title claims description 14
- 239000002253 acid Substances 0.000 title description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 abstract 2
- 235000011149 sulphuric acid Nutrition 0.000 abstract 2
- 239000001117 sulphuric acid Substances 0.000 abstract 2
- 230000000171 quenching effect Effects 0.000 abstract 1
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
Images
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses the automatic control device of quench tower acid inlet amount in acrylonitrile technology, including sulphuric acid pump, pH analysis appearance, its characterized in that increases computer centralized control device DCS and variable frequency speed regulator between pH analysis appearance and sulphuric acid pump. The liquid phase material flow in the acrylonitrile production process is adjusted by adopting the frequency conversion technology, the traditional mode that the material flow is adjusted by an adjusting valve in the production process of the acrylonitrile industry is broken through, the pH value of the quenching tower is stabilized in a relatively stable range, the quality and the yield of acrylonitrile products are improved, and the labor intensity and the production cost of workers are reduced.
Description
The utility model belongs in the vinyl cyanide industry control device of quench tower acid intake amount in the acrylonitrile process.
Current, domestic vinyl cyanide industry is produced the above scale device of 2.5 tons per year and is the U.S. BP company technology of introducing, and its technological process is that propylene, ammonia, air oxidizing reaction under catalyst action generates vinyl cyanide.Then use in the sulfuric acid pump and generation ammonium sulfate to the unreacted ammonia that vinyl cyanide is carried secretly through quench tower.
The sulfuric acid of quench tower is squeezed into the sulfuric acid pump, and the control of vitriolic add-on and pH value is to be foundation with the PH analyser to the monitoring data value of pH value in the quench tower epimere circulation fluid, and the aperture of regulating the sulfuric acid feed valve realizes by changing vitriolic acid flux.Because the variable valve response lag, the sulfuric acid amount that enters quench tower changes greatly, thereby causes pH value to fluctuate up and down greatly, is difficult to be stabilized in the technology controlling and process value scope.Can change variable valve into volume pump and carry out Flow-rate adjustment, but effect is still very poor, and volume pump needs artificial execute-in-place, the increase labor strength.
PH value control is unstable, badly influences the absorption of vinyl cyanide, the stability of subsequent handling system pH value such as refining, and makes following adverse consequences is arranged in the acrylonitrile process process:
1, level of acrolein increases in the acrylonitrile process, influences the vinyl cyanide quality product;
2, cause material generation polymerizations such as vinyl cyanide easily, have influence on the quality and the yield of vinyl cyanide product;
3, increase article such as sulfuric acid, yellow soda ash and water, electricity, vapour consumption, increased the cost of acrylonitrile process.
The objective of the invention is the acid intake amount of quench tower in the acrylonitrile process is controlled automatically, the pH value of quench tower is stabilized in the metastable scope, improve vinyl cyanide quality product and output.
The automatic control device of quench tower acid intake amount in the acrylonitrile process of the present invention, comprise sulfuric acid pump, PH analyser, it is characterized in that between PH analyser and sulfuric acid pump, increasing computer central control device DCS and variable-frequence governor, the input terminus of PH analyser and DCS joins, the output termination variable-frequence governor of DCS, variable-frequence governor is concatenated on the supply lead of sulfuric acid pump, another termination power.
Fig. 1 is the synoptic diagram that device of the present invention is used for technical process;
Fig. 2 is the control block diagram of this device;
Fig. 3 is the conversion of signals schematic flow sheet of this device;
Fig. 4 is this device connection principle synoptic diagram;
Find out by Fig. 1, pH value in the quench tower epimere circulation fluid is at any time by monitoring of pH value analyser and the instantaneous computer control system DCS that transfers data to, sending temporal variation by Controlling System instructs to variable-frequence governor, the instruction that variable-frequence governor sends according to computer (sulfuric acid requirement), in time the rotating speed of regulating the sulfuric acid pump motor realizes regulating vitriolic acid flux, makes pH value control reach the optimised process production status.
The pH value analyser is to have measurement, become the existing apparatus send function, as shown in Figure 3, the detected pH value signal of pH value analyser (AT) is changed into the standard signal PV of 4～20mA by transducing unit, deliver in the DCS treater through the input fastener of DCS, (SV) compares with set(ting)value, difference DELTA P relatively carries out ratio, integration, differential calculation through DCS software, and 4～20mA output signal MV of outputting standard is as the input signal of variable-frequence governor.The frequency-variable module of MV value input variable-frequence governor through setting, is adjusted into 10～50HZ with the supply frequency of motor, makes the variation of pH value parameter smoothing ground.The frequency setting of sulfuric acid pump motor is 10～50HZ, not only guarantees the electric motor continuous operation, and guarantees that material does not reflux.
Fig. 4 is that CENTUM-B is an example with the model of DCS.
Advantage of the present invention:
Adopt converter technique to regulate liquid phase material flow in the Acrylonitrile Production, broken through in the acrylonitrile industry production process Regulate the traditional approach of mass flow with control valve, the pH value of quench tower is stabilized in the metastable scope. Rise Arrived following effect:
1, reduces the content of propenal in the vinyl cyanide product, improved the vinyl cyanide quality product;
2, obviously reduce the polymerism of materials such as vinyl cyanide, thereby reduced the loss amount of vinyl cyanide, improved the product yield and the output of vinyl cyanide, increased about 20 tons vinyl cyanide output year;
3, obviously reduce the consumption of article such as sulfuric acid, yellow soda ash and water, electricity, vapour, reduced the cost of vinyl cyanide;
4, control automatically greatly reduces working strength of workers;
5, because the system polymerism reduces, correspondingly prolonged the equipment cycle of operation.
Claims (1)
1, the automatic control device of quench tower acid intake amount in a kind of acrylonitrile process, comprise sulfuric acid pump, PH analyser, it is characterized in that between PH analyser and sulfuric acid pump, increasing computer central control device DCS and variable-frequence governor, the input terminus of PH analyser and DCS joins, the output termination variable-frequence governor of DCS, variable-frequence governor is concatenated on the supply lead of sulfuric acid pump, a termination power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98250812 CN2386046Y (en) | 1998-12-31 | 1998-12-31 | Automatic control device for acid inlet amount of quench tower in acrylonitrile process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98250812 CN2386046Y (en) | 1998-12-31 | 1998-12-31 | Automatic control device for acid inlet amount of quench tower in acrylonitrile process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2386046Y true CN2386046Y (en) | 2000-07-05 |
Family
ID=33995193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98250812 Expired - Fee Related CN2386046Y (en) | 1998-12-31 | 1998-12-31 | Automatic control device for acid inlet amount of quench tower in acrylonitrile process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2386046Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896806A (en) * | 2014-04-02 | 2014-07-02 | 中国石油集团东北炼化工程有限公司吉林设计院 | System for separating and purifying acrylonitrile |
| WO2015200022A1 (en) * | 2014-06-27 | 2015-12-30 | Ineos Europe Ag | Control of ammonia and/or air feed into an ammoxidation reactor |
| CN105425849A (en) * | 2015-08-03 | 2016-03-23 | 英尼奥斯欧洲股份公司 | Quench tower ph control |
| CN105987634A (en) * | 2015-01-31 | 2016-10-05 | 中国石油化工股份有限公司 | Water replenishing device |
-
1998
- 1998-12-31 CN CN 98250812 patent/CN2386046Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896806A (en) * | 2014-04-02 | 2014-07-02 | 中国石油集团东北炼化工程有限公司吉林设计院 | System for separating and purifying acrylonitrile |
| WO2015200022A1 (en) * | 2014-06-27 | 2015-12-30 | Ineos Europe Ag | Control of ammonia and/or air feed into an ammoxidation reactor |
| CN105987634A (en) * | 2015-01-31 | 2016-10-05 | 中国石油化工股份有限公司 | Water replenishing device |
| CN105987634B (en) * | 2015-01-31 | 2018-09-14 | 中国石油化工股份有限公司 | The supplementing device of water |
| CN105425849A (en) * | 2015-08-03 | 2016-03-23 | 英尼奥斯欧洲股份公司 | Quench tower ph control |
| CN105425849B (en) * | 2015-08-03 | 2020-06-26 | 英尼奥斯欧洲股份公司 | Quench tower pH control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103695569B (en) | Preliming reactor and method | |
| CN214570954U (en) | Intelligent coagulant adding system | |
| CN2386046Y (en) | Automatic control device for acid inlet amount of quench tower in acrylonitrile process | |
| CN103058352A (en) | Automatic control system for ozone generation and water treatment | |
| CN201828788U (en) | Automatic dissolved oxygen measuring and controlling system and aerobic organism treatment equipment | |
| CN210795894U (en) | Full-automatic aeration energy-saving control system | |
| CN105749729A (en) | Ammonification system based on automatic-adjusted pH value | |
| CN114428523B (en) | Inflow water adjusting and controlling method for decentralized sewage treatment | |
| CN205740827U (en) | methyl chloroacetate continuous production device | |
| CN113230917B (en) | Adjustable static hydraulic mixing method and measurement and control system | |
| CN201644755U (en) | Control device of die casting machine | |
| CN205650071U (en) | Automatically regulated adds ammonia system based on pH value | |
| CN214225778U (en) | Automatic acid regulation control system | |
| CN213024074U (en) | Liquid flow adjusting device for mineral separation | |
| CN203299626U (en) | Intelligent combined-type hydrogen-adding automatic matching device | |
| CN114967779A (en) | Intelligent stirring control system of edible mushroom cultivation material mixer | |
| CN211627369U (en) | Device for automatically monitoring acetic anhydride content | |
| CN204724018U (en) | The flue gas desulfurization automatic control system of ultra-clean discharge can be realized | |
| CN1390858A (en) | Full-automatic control method using fuzzy control for temp of polymerizing reactor | |
| CN211367155U (en) | Intelligent sewage treatment aeration equipment | |
| CN221125126U (en) | Device for controlling uranium molybdenum extraction flow ratio | |
| CN101571713A (en) | Full-flow automatically-optimized energy-saving furfural production technology | |
| CN207115211U (en) | A kind of pre- grey automatic control system of two-stage | |
| CN105603467A (en) | Hysteretic pH value control device and control method | |
| CN205101218U (en) | Multidimension degree sensing detection circuitry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |