CN203209035U - Automatic control system for removing heat of molten salt in reactor capable of producing acrylic acid through propane one-step process - Google Patents
Automatic control system for removing heat of molten salt in reactor capable of producing acrylic acid through propane one-step process Download PDFInfo
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- CN203209035U CN203209035U CN 201320176550 CN201320176550U CN203209035U CN 203209035 U CN203209035 U CN 203209035U CN 201320176550 CN201320176550 CN 201320176550 CN 201320176550 U CN201320176550 U CN 201320176550U CN 203209035 U CN203209035 U CN 203209035U
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- fused salt
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- thermocouple
- molten salt
- temperature transmitter
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Abstract
The utility model relates to a control system, and particularly relates to an automatic control system for removing the heat of molten salt in a reactor capable of producing acrylic acid through a propane one-step process. A second thermocouple and a temperature transmitter thereof are arranged on a molten salt outlet pipe of an electric heater, the temperature transmitter is connected with a temperature regulator in a DCS (distributed control system) to form a temperature regulating system, a molten salt flow control valve is arranged in a molten salt inlet pipeline; and a first thermocouple and a temperature transmitter thereof are arranged on a molten salt inlet pipe of the electric heater, a third thermocouple and a temperature transmitter thereof are arranged on the molten salt outlet pipe of the reactor, the temperature transmitter is connected with a temperature exerciser which is connected with the first thermocouple and the temperature transmitter thereof, and the calculation result of the temperature difference exerciser is sent into an interlocking alarm system in the DCS. The automatic control system for removing heat of molten salt in the reactor capable of producing acrylic acid through a propane one-step process has the advantages of being capable of accurately controlling the temperature of an oxidization reactor, fast and evenly removing reaction heat, and ensuring the reactor to safely and stably run.
Description
Technical field
The utility model relates to a kind of control system, more particularly, relates to a kind of petrochemical industry automatic control system.
Background technology
Acrylic acid is a kind of important chemical material, is widely used in the production of various chemicals and resin.The acrylic acid traditional handicraft is by propylene two-step oxidation method for preparing acrylic acid, because preparing process, two-step method require equipment investment bigger, and energy waste is more serious, adopts propane to replace propylene to produce acrylic acid as raw material, investment that can saveall, reduces operating cost.
The propane one-step oxidation process is produced acrylic acid technology, mainly is to be raw material with propane, oxygen, issues angry phase oxidation reaction in the catalyst condition, and its reaction equation is as follows:
CH
3-CH
2-CH
3+2O
2→CH
2＝CHCOOH(g)+2H
2O(g) ΔH＝-715kJ
Main side reaction has:
CH
3-CH
2-CH
3+3O
2→CH
3COOH+2H
2O+CO
2
CH
3-CH
2-CH
3+5O
2→4H
2O+3CO
2
The propane one-step oxidation process is produced acrylic acid needs certain heat when oxidation of propane reaction beginning, and because this course of reaction is the strong oxidation reaction of heat release, when reaction is carried out, can produce a large amount of reaction heat again, withdraw from untimelyly as reaction heat, then temperature runaway danger can occur.Device moves under the overtemperature state and is harmful to very much, can cause the catalyst coking to be burnt even.Therefore, in DCS, be provided with temperature transmitter and be provided with the complete temperature control program of a cover, reaction heat is also withdrawn rapidly equably, carry out to guarantee to be reflected under the metastable temperature.
Summary of the invention:
The objective of the invention is to overcome the deficiency of prior art, provide a kind of fused salt of acrylic acid reactor to remove the heat automatic control system.
It is 325 ℃ that the propane one-step oxidation process is produced acrylic acid reactor operating temperature, and in order to keep this reaction temperature, the employing fused salt is thermophore, and said fused salt is 40%NaNO
2, 7%NaNO
3And 53%KNO
3The mixture molten mass, the heat-resistant stability of this thermophore is good, its heat transfer coefficient is the twice of other organic heat-carrying agents, and temperature do not produce steam, so it is the best heat carrier of this technology below 600 ℃ the time.
The heat of removing of propane one-step method acrylic acid reactor processed fused salt is used automatic control system, it is characterized in that, in horizontal hot melt salt cellar, the high steam heating is arranged, after fused salt in the jar melts, adopt pump for liquid salts that hot melt salt is transported in the fused salt system, through molten salt circulating pump fused salt is circulated in system, by electric heater fused salt is heated to the needed temperature of reaction, the fused salt after the heating is sent into shell and tube reactor, when carrying out, reaction produces a large amount of heats, taken away by fused salt, heated fused salt is sent into cooler with fused salt and desalted water heat exchange through molten salt circulating pump, produce steam, remove heat;
Fused salt outlet at electric heater is provided with second thermocouple and temperature transmitter thereof, and temperature transmitter is connected with the thermoregulator among the DCS, constitutes humidity control system, and its fused salt flow control valve is located on the fused salt inlet pipeline; Fused salt inlet tube at electric heater is provided with first thermocouple and temperature transmitter thereof, fused salt outlet at reactor is provided with three thermocouple and temperature transmitter thereof, this temperature transmitter is connected with temperature difference exerciser, temperature difference exerciser links to each other with first thermocouple and temperature transmitter thereof, temperature difference exerciser (TDI-2) results in, and sends into the interlock alarm system among the DCS.
Advantage of the present utility model provides a kind of propane one-step method to produce acrylic acid fused salt and removes thermal control system, can carry out the precise dose control of oxidation reactor with this system, makes reaction heat rapidly and withdraws the even running of assurance reactor equably.Simultaneously reaction heat is recycled the energy consumption of economy system.
Description of drawings
Fig. 1 is the simplified flow chart at band control point.
Hot melt salt cellar 1, pump for liquid salts 2, electric heater 3, reactor 4, molten salt circulating pump 5, cooler 6 are arranged among the figure.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is made detailed description further.
As shown in the figure, in horizontal hot melt salt cellar 1, the high steam heating is arranged, after fused salt in the jar melts, adopt pump for liquid salts 2 that hot melt salt is transported in the fused salt system, through molten salt circulating pump 5 fused salt is circulated in system, by electric heater 3 fused salt is heated to the needed temperature of reaction, fused salt after the heating is sent into shell and tube reactor 4, produce a large amount of heats when reaction is carried out, taken away by fused salt, heated fused salt is through molten salt circulating pump 5, send into cooler 6 with fused salt and desalted water heat exchange, produce steam and remove heat;
Be provided with second thermocouple and the temperature transmitter thereof of TIC-1 at the fused salt outlet of electric heater 3, temperature transmitter is connected with the thermoregulator among the DCS, constitutes humidity control system TIC-1, and its fused salt flow control valve TV-1 is located on the fused salt inlet pipeline; Fused salt inlet tube at electric heater 3 is provided with first thermocouple TI-2B and the temperature transmitter thereof, fused salt outlet at reactor is provided with three thermocouple TI-2A and temperature transmitter thereof, this temperature transmitter is connected with temperature difference exerciser, temperature difference exerciser links to each other with the first thermocouple TI-2B and temperature transmitter thereof, temperature difference exerciser TDI-2 results in, and sends into the interlock alarm system among the DCS.
Be example with certain pilot-plant, set forth the propane one-step oxidation process produce the acrylic acid reactor fused salt remove thermal control system.
Propane carries out the oxidation reaction initial stage in oxidation reactor, and perhaps during reactor 4 stopped charging maintenance temperature, the fused salt system of operation earlier also regulated the needed temperature of beds.Controlled the temperature of fused salt this moment by fused salt electric heater 3.Fused salt electric heater 3 is controlled electric heater constantly by the semiconductor power controller of grouping.Fused salt electric heater thermic load can continue to change from 0～100%, and its variation of thermic load each time all keeps equal.Opened/power failure heater 3 by semiconductor element according to pulse duration modulation method, make thermic load continue to change.By fused salt electric heater 3 fused salt is heated to 325 ℃, and keeps this reaction temperature.
Can produce a large amount of reaction heat along with propane and oxygen carry out chemical reaction, need to regulate the fused salt system, to keep the temperature in the reactor 4, this reaction heat is shifted out by the hot melt salt in reactor 4 shell-sides, with the desalted water heat exchange, produces steam in cooler 6.
Be used for the thermocouple of temperature measurement system TIC-1 on the input pipe of reactor 4, be installed on the fused salt outlet of electric heater 3, adjusting fused salt flow control valve TV-1 controls the temperature on the fused salt pipeline that enters reactor.Be used for to measure two thermocouple TI-2A and the TI-2B of temperature of molten salt, be installed on the outlet fused salt pipe of reactor 4 respectively and on the fused salt inlet tube of electric heater, two temperatures carries out temperature difference indication, the temperature difference of setting two thermocouple TI-2A and TI-2B is no more than 5 ℃, if the temperature difference that the temperature difference exerciser TDI-2 of TI-2A and TI-2B shows, surpass the scope that allow, will carry out the acousto-optic interlock alarm, stop in emergency in case of necessity, to guarantee the even of fused salt system temperature, reaction system is in a safe condition all the time.
The reaction liberated heat by molten salt circulating pump 5, is removed by molten heat transfer salt, by fused salt cooler 6 and desalted water heat exchange, produces the saturated vapor of 0.65MPaG.The saturated vapor that produces can be used as accessory substance and is used.
Claims (1)
1. the heat of removing of propane one-step method acrylic acid reactor processed fused salt is used automatic control system, it is characterized in that, in horizontal hot melt salt cellar (1), the high steam heating is arranged, after fused salt in the jar melts, adopt pump for liquid salts (2) that hot melt salt is transported in the fused salt system, through molten salt circulating pump (5) fused salt is circulated in system, by electric heater (3) fused salt is heated to the needed temperature of reaction, the fused salt after the heating is sent into shell and tube reactor (4), when carrying out, reaction produces a large amount of heats, taken away by fused salt, heated fused salt is sent into cooler (6) with fused salt and desalted water heat exchange through molten salt circulating pump (5), produce steam, remove heat;
Fused salt outlet at electric heater (3) is provided with second thermocouple and temperature transmitter thereof, and temperature transmitter is connected with the thermoregulator (TIC-1) among the DCS, constitutes humidity control system, and its fused salt flow control valve (TV-1) is located on the fused salt inlet pipeline; Fused salt inlet tube at electric heater (3) is provided with first thermocouple (TI-2B) and temperature transmitter thereof, fused salt outlet at reactor (4) is provided with three thermocouple (TI-2A) and temperature transmitter thereof, this temperature transmitter is connected with temperature difference exerciser (TDI-2), temperature difference exerciser (TDI-2) links to each other with first thermocouple (TI-2B) and temperature transmitter thereof, temperature difference exerciser (TDI-2) results in, and sends into the interlock alarm system among the DCS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320176550 CN203209035U (en) | 2013-03-26 | 2013-03-26 | Automatic control system for removing heat of molten salt in reactor capable of producing acrylic acid through propane one-step process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320176550 CN203209035U (en) | 2013-03-26 | 2013-03-26 | Automatic control system for removing heat of molten salt in reactor capable of producing acrylic acid through propane one-step process |
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| Publication Number | Publication Date |
|---|---|
| CN203209035U true CN203209035U (en) | 2013-09-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320176550 Expired - Lifetime CN203209035U (en) | 2013-03-26 | 2013-03-26 | Automatic control system for removing heat of molten salt in reactor capable of producing acrylic acid through propane one-step process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537243A (en) * | 2013-10-30 | 2014-01-29 | 天津市化工设计院 | Device and method for removing reaction heat in acrolein oxidation |
| CN104437270A (en) * | 2014-11-14 | 2015-03-25 | 中国石油集团东北炼化工程有限公司吉林设计院 | Acrylic acid reaction system |
| CN104826568A (en) * | 2015-05-15 | 2015-08-12 | 南京科技职业学院 | High-temperature melt-salt pump cooling device and cooling state monitoring method |
| CN105017008A (en) * | 2014-04-28 | 2015-11-04 | 中国科学院大连化学物理研究所 | Method for continuously producing acrylic acid through one-step oxidation of propane |
| CN105327656A (en) * | 2014-08-06 | 2016-02-17 | 南京化工职业技术学院 | Multi-process gas-solid reaction device |
| CN110142007A (en) * | 2019-05-21 | 2019-08-20 | 宁波浙铁江宁化工有限公司 | Cis-butenedioic anhydride prepares the fused salt loop structure in reactor |
| CN115888564A (en) * | 2022-10-31 | 2023-04-04 | 东方电气集团东方锅炉股份有限公司 | Double-pump circulation loop maleic anhydride reactor complete device and control method thereof |
-
2013
- 2013-03-26 CN CN 201320176550 patent/CN203209035U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537243A (en) * | 2013-10-30 | 2014-01-29 | 天津市化工设计院 | Device and method for removing reaction heat in acrolein oxidation |
| CN103537243B (en) * | 2013-10-30 | 2015-11-11 | 天津市化工设计院 | Acrolein oxidation reaction heat moving-out device and method |
| CN105017008A (en) * | 2014-04-28 | 2015-11-04 | 中国科学院大连化学物理研究所 | Method for continuously producing acrylic acid through one-step oxidation of propane |
| CN105327656A (en) * | 2014-08-06 | 2016-02-17 | 南京化工职业技术学院 | Multi-process gas-solid reaction device |
| CN104437270A (en) * | 2014-11-14 | 2015-03-25 | 中国石油集团东北炼化工程有限公司吉林设计院 | Acrylic acid reaction system |
| CN104826568A (en) * | 2015-05-15 | 2015-08-12 | 南京科技职业学院 | High-temperature melt-salt pump cooling device and cooling state monitoring method |
| CN110142007A (en) * | 2019-05-21 | 2019-08-20 | 宁波浙铁江宁化工有限公司 | Cis-butenedioic anhydride prepares the fused salt loop structure in reactor |
| CN115888564A (en) * | 2022-10-31 | 2023-04-04 | 东方电气集团东方锅炉股份有限公司 | Double-pump circulation loop maleic anhydride reactor complete device and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200927 Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province Patentee after: PetroChina Jilin Chemical Engineering Co.,Ltd. Address before: Changyi District of Jilin city in Jilin province 132001 Tong Tan Road Jihua Trade Center building A Patentee before: JILIN DESIGNING INSTITUTE OF CNPC NORTHEAST REFINING & CHEMICAL ENGINEERING Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130925 |