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 PDF

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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
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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
Application number
CN 98250812
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Chinese (zh)
Inventor
张沛存
宫晓燕
贺延文
衣兰新
王效斗
刘工友
田冰
柏广文
赵爱国
杨梅
浦为民
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Qilu Petrochemical Co of Sinopec
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Qilu Petrochemical Co of Sinopec
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Priority to CN 98250812 priority Critical patent/CN2386046Y/en
Application granted granted Critical
Publication of CN2386046Y publication Critical patent/CN2386046Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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 automatic control device of quench tower acid intake amount in the acrylonitrile process
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.
CN 98250812 1998-12-31 1998-12-31 Automatic control device for acid inlet amount of quench tower in acrylonitrile process Expired - Fee Related CN2386046Y (en)

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

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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

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CN (1) CN2386046Y (en)

Cited By (4)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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

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C19 Lapse of patent right due to non-payment of the annual fee
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