CN114111420B - Automatic control system and method for heat recovery in tetrafluoroethylene production - Google Patents
Automatic control system and method for heat recovery in tetrafluoroethylene production Download PDFInfo
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- CN114111420B CN114111420B CN202111423033.3A CN202111423033A CN114111420B CN 114111420 B CN114111420 B CN 114111420B CN 202111423033 A CN202111423033 A CN 202111423033A CN 114111420 B CN114111420 B CN 114111420B
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- compensator
- cold
- waste heat
- temperature
- heat
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- 238000011084 recovery Methods 0.000 title claims abstract description 31
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000002918 waste heat Substances 0.000 claims abstract description 45
- 230000001105 regulatory effect Effects 0.000 claims abstract description 32
- 238000000197 pyrolysis Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 9
- 230000001502 supplementing effect Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052731 fluorine Inorganic materials 0.000 abstract description 2
- 239000011737 fluorine Substances 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0022—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for chemical reactors
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses an automatic control system and method for heat recovery in tetrafluoroethylene production, which belong to the technical field of fluorine industry and comprise a desalted water overhead tank and a waste heat recoverer, wherein the desalted water overhead tank is used for automatically supplementing water to the system and is connected with an inlet of the waste heat recoverer through a hot water pump; the waste heat recoverer is used for receiving pyrolysis gas, the outlet of the waste heat recoverer is connected with the heat compensator and the cold compensator in parallel, the heat compensator and the cold compensator are respectively connected with the user end, the heat compensator is provided with a heat compensation regulating valve, and the cold compensator is provided with a cold compensation regulating valve; the waste heat recoverer can send desalted water after waste heat recovery to the user side through the heat compensator or the cold compensator. The invention realizes the automatic control of heat recovery in tetrafluoroethylene production and improves the self-control level of tetrafluoroethylene production.
Description
Technical Field
The invention relates to the technical field of fluorine chemical industry, in particular to an automatic control system and method for heat recovery in tetrafluoroethylene production.
Background
Along with the continuous progress of chemical technology, the automatic control level is required to be gradually increased, but the automatic control level of the existing tetrafluoroethylene production, especially the energy-saving link, is not high, and the method is a key problem which is urgently solved by the industry at present. For example, the prior art discloses a system and a method for recovering heat energy of tetrafluoroethylene pyrolysis gas, which comprises a steam generator, a cooler and a heat energy recoverer, and adopts a two-stage recovery method to realize heat recovery of tetrafluoroethylene pyrolysis gas. Although the above system is capable of achieving heat recovery, effective control of each link cannot be achieved during the heat recovery process.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an automatic control system and method for heat recovery in tetrafluoroethylene production, which realize the automatic control of heat recovery in tetrafluoroethylene production and improve the self-control level of tetrafluoroethylene production.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, embodiments of the present invention provide an automated control system for heat recovery in tetrafluoroethylene production, comprising:
the desalted water elevated tank is used for automatically supplementing water to the system and is connected with the inlet of the waste heat recoverer through the hot water pump;
the waste heat recoverer is used for receiving pyrolysis gas, the outlet of the waste heat recoverer is connected with the heat compensator and the cold compensator in parallel, the heat compensator and the cold compensator are respectively connected with a user end, the heat compensator is provided with a heat compensation regulating valve, and the cold compensator is provided with a cold compensation regulating valve; the waste heat recoverer can send desalted water after waste heat recovery to the user side through the heat compensator or the cold compensator.
As a further implementation manner, the connecting pipeline of the waste heat recoverer, the thermal compensator and the cold compensator is provided with a first thermometer.
As a further implementation mode, a second thermometer is arranged on a connecting pipeline between the thermal compensator and the user side, the second thermometer and the thermal compensation regulating valve form feedback, and the opening of the thermal compensation regulating valve is controlled according to the temperature detected by the second thermometer.
As a further implementation manner, a third thermometer is installed between the cold compensator and the connecting pipeline of the user, and the cold compensator is connected with the controller, and the third thermometer can feed back the detection temperature to the controller.
As a further implementation mode, the desalted water elevated tank is provided with a water supplementing quick-cutting valve, a water draining quick-cutting valve and a liquid level meter.
In a second aspect, an embodiment of the present invention further provides an automatic control method for heat recovery in tetrafluoroethylene production, where the control system is adopted, including:
the high-temperature pyrolysis gas enters a waste heat recoverer after being chilled and cooled;
the desalted water is fed into the control system from the desalted water overhead tank to a set range and then stopped;
pumping desalted water into a waste heat recoverer by a hot water pump to recover waste heat, and then delivering the desalted water into each user end through a heat compensator or a cold compensator; when the temperature does not reach the first set temperature range, performing thermal compensation by controlling a thermal compensation regulating valve; when the temperature is higher than the second set temperature range, the cold compensation is performed by controlling the cold compensation regulating valve.
As a further implementation manner, when the temperature of the hot water output by the waste heat recoverer is lower than 70 ℃, the second thermometer behind the thermal compensator detects that the temperature is lower than 70 ℃, and the thermal compensation regulating valve is opened to carry out heating compensation.
As a further implementation mode, when the temperature of the hot water output by the waste heat recoverer is higher than 80 ℃, the cold compensation regulating valve is opened to perform cooling cold compensation; and meanwhile, a third thermometer behind the cold compensator detects that the temperature is higher than 80 ℃, and a controller of the cold compensator automatically adjusts the cooling air quantity of the cold compensator to carry out cooling cold compensation.
As a further implementation way, the liquid level of the desalted water elevated tank is set to 50%, and when the set value is reached, the water supplementing quick-cut valve is closed; during operation, the drain quick-cut valve opens the drain when the liquid level is above 85%.
As a further implementation, the heat is controlled to operate at constant temperature through each valve interlock and is delivered to each user side.
The beneficial effects of the invention are as follows:
the waste heat in the tetrafluoroethylene production process is reasonably provided with facilities such as desalted water inlet and outlet adjustment, hot water temperature, cold and hot compensator and the like through automatic control operations such as cold and hot compensation and the like, so that automatic operation and automatic adjustment control are realized, the heat carried by process materials after tetrafluoroethylene production is sent to each user for use under the constant-temperature stable state without affecting the operation of the whole system, and the automation level of a process system is improved to realize the stable operation of the system.
When the temperature of hot water output by the waste heat recoverer is lower than 70 ℃, a second thermometer behind the thermal compensator detects that the temperature is lower than 70 ℃, and a thermal compensation regulating valve is opened to carry out heating compensation; when the temperature of the hot water output by the waste heat recoverer is higher than 80 ℃, the cold compensation regulating valve is opened to perform cooling cold compensation; the constant temperature of the externally supplied hot water is ensured through the setting of the cold and hot compensation temperature condition, so that the stable use of each user is ensured, and the phenomenon that each user cannot stably operate due to fluctuation is avoided.
The process method is simple and stable in operation, and realizes automatic control of heat recovery in tetrafluoroethylene production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a structure in accordance with one or more embodiments of the invention;
FIG. 2 is a schematic illustration of coordinated control according to one or more embodiments of the invention;
the system comprises a water supplementing quick-cutting valve 1, a liquid level meter 2, a heat compensation regulating valve 3, a second thermometer 4, a cold compensation regulating valve 5, a first thermometer 6, a third thermometer 7, a controller 8, a controller 9, a water draining quick-cutting valve 10, a desalted water high-level tank 11, a waste heat recoverer 12, a heat compensator 13, a cold compensation device 14, a hot water pump 15 and a user side.
Detailed Description
Embodiment one:
the embodiment provides an automatic control system for heat recovery in tetrafluoroethylene production, which comprises a desalted water overhead tank 10, a waste heat recoverer 11, a heat compensator 12 and a cold compensator 13, wherein high-temperature (650-730 ℃) pyrolysis gas output from a pyrolysis reactor enters the waste heat recoverer 11 for heat recovery after chilled cooling; the input end of the waste heat recoverer 11 is connected with a hot water pump 14, the output end is connected with a heat compensator 12 and a cold compensator 13, and the heat compensator 12 and the cold compensator 13 are connected in parallel.
In the present embodiment, the waste heat recoverer 11 is a graphite waste heat recoverer.
The first thermometer 6 is installed on the connecting pipeline between the output end of the cold compensator 13 and the hot compensator 12, the cold compensator 13, and the pipeline behind the first thermometer 6 forms two branches, wherein one branch is connected with the hot compensator 12, and the other branch is connected with the cold compensator 13.
The branch connected with the cold compensator 13 is provided with a cold compensation regulating valve 5, feedback is formed between the cold compensation regulating valve 5 and the first thermometer 6, and when the temperature detected by the first thermometer 6 reaches a set range, the cold compensation regulating valve 5 is started to perform cold compensation.
Further, the steam input end of the thermal compensator 12 is provided with the thermal compensation regulating valve 3, the connecting pipeline of the thermal compensator 12 and the user end 15 is provided with the second thermometer 4, and the second thermometer 4 and the thermal compensation regulating valve 3 form feedback.
The output ends of the desalted water elevated tank 10 and the cold compensator 13 are connected with the input end of the hot water pump 14; after the hot water pump 14 is operated, desalted water is pumped into the waste heat recoverer 11 for waste heat recovery, and then is sent into each user for use through the heat compensator 12 or the cold compensator 13 (air cooling cooler).
The desalted water high-level tank 10 is connected with the water supplementing quick-cut valve 1, the water draining quick-cut valve 9 and the liquid level meter 2, the water level of the desalted water high-level tank 10 is monitored through the liquid level meter 2, and the water supplementing quick-cut valve 1 or the water draining quick-cut valve 9 is controlled to be started according to the water level. The water level is controlled to avoid that the overflow and the empty liquid level can cause the stop of the circulating pump to cause the stop of the hot water system, thereby causing the stop of each user.
The automatic control system of the embodiment is provided with a thermal compensation regulating valve, a thermometer, a cold compensation controller and a thermometer; the thermal compensation regulating valve and the thermometer are provided with automatic control and regulation, and the cold compensation regulating valve and the thermometer are provided with automatic control so as to realize automatic control of thermal compensation and cold compensation.
Embodiment two:
the embodiment provides an automatic control method for heat recovery in tetrafluoroethylene production, which adopts the automatic control system in the first embodiment and comprises the following steps:
the pyrolysis gas with high temperature (650-730 ℃) output from the pyrolysis reactor is chilled and cooled and then enters a waste heat recoverer to heat desalted water for heat recovery.
After the desalted water is filled into the system from the overhead tank, the whole heat recovery and water filling of the system using hot water are stopped, namely, the water filling quick-cut valve and the water discharging quick-cut valve are respectively automatically controlled with the liquid level, so that 50% of water filling is stopped, and the water is discharged more than 85%.
After the hot water pump operates, desalted water is pumped into the graphite waste heat recoverer for waste heat recovery, and then is sent into each user for use through the thermal compensator or the cold compensator.
And if the temperature of the hot water coming out of the waste heat recoverer is lower than 70 ℃, the temperature detected by a second thermometer behind the thermal compensator is lower than 70 ℃, and the thermal compensation regulating valve is opened to carry out heating compensation.
The temperature of hot water coming out of the waste heat recoverer is higher than 80 ℃, and the first thermometer after heat recovery detects that the temperature is higher than 80 ℃, and the cold compensation regulating valve is opened to perform cooling cold compensation; and meanwhile, a third thermometer behind the cold compensator detects that the temperature is higher than 80 ℃ and the controller of the cold compensator automatically adjusts the cooling air quantity of the cold compensator to carry out cooling cold compensation.
The constant temperature of the externally supplied hot water is ensured through the setting of the cold and hot compensation temperature condition, so that the stable use of each user is ensured, and the phenomenon that each user cannot stably operate due to fluctuation is avoided.
As shown in fig. 2, the heat is controlled to operate at a constant temperature and is sent to each user through the series of interlocking controls described above.
The waste heat in the production process of the recovered tetrafluoroethylene is reasonably provided with facilities such as desalted water inlet and outlet adjustment, hot water temperature, cold and hot compensator and the like through automatic control operations such as cold and hot compensation and the like, so that automatic operation and automatic adjustment control are realized, the heat carried by the process materials after tetrafluoroethylene production is sent to each user for use under the constant temperature stable state under the condition that the operation of the whole system is not influenced, and the automation level of a process system is improved to realize the stable operation of the system. The process method is simple and stable in operation, and realizes the automatic control of heat recovery in tetrafluoroethylene production.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (5)
1. An automatic control method for heat recovery in tetrafluoroethylene production is characterized in that an automatic control system is adopted, and the automatic control system comprises:
the desalted water elevated tank is used for automatically supplementing water to the system and is connected with the inlet of the waste heat recoverer through the hot water pump;
the waste heat recoverer is used for receiving pyrolysis gas, the outlet of the waste heat recoverer is connected with the heat compensator and the cold compensator in parallel, the heat compensator and the cold compensator are respectively connected with a user end, the heat compensator is provided with a heat compensation regulating valve, and the cold compensator is provided with a cold compensation regulating valve; the waste heat recoverer can send desalted water after waste heat recovery to a user side through the heat compensator or the cold compensator;
the connecting pipeline of the waste heat recoverer, the thermal compensator and the cold compensator is provided with a first thermometer; a second thermometer is arranged on a connecting pipeline between the thermal compensator and the user side, and forms feedback with the thermal compensation regulating valve, and the opening of the thermal compensation regulating valve is controlled according to the temperature detected by the second thermometer;
the control method comprises the following steps:
the high-temperature pyrolysis gas enters a waste heat recoverer after being chilled and cooled;
the desalted water is fed into the control system from the desalted water overhead tank to a set range and then stopped;
pumping desalted water into a waste heat recoverer by a hot water pump to recover waste heat, and then delivering the desalted water into each user end through a heat compensator or a cold compensator; when the temperature does not reach the first set temperature range, performing thermal compensation by controlling a thermal compensation regulating valve; when the temperature is higher than a second set temperature range, cold compensation is performed by controlling the cold compensation regulating valve;
when the temperature of the hot water output by the waste heat recoverer is lower than 70 ℃, a second thermometer behind the thermal compensator detects that the temperature is lower than 70 ℃, and a thermal compensation regulating valve is opened to carry out heating compensation;
when the temperature of the hot water output by the waste heat recoverer is higher than 80 ℃, the cold compensation regulating valve is opened to perform cooling cold compensation; and meanwhile, a third thermometer behind the cold compensator detects that the temperature is higher than 80 ℃, and a controller of the cold compensator automatically adjusts the cooling air quantity of the cold compensator to carry out cooling cold compensation.
2. The automated control method for heat recovery in tetrafluoroethylene production according to claim 1, wherein a third thermometer is installed between the cold compensator and the connection pipeline of the user, and the cold compensator is connected with the controller, and the third thermometer can feed back the detected temperature to the controller.
3. The automated control method for heat recovery in tetrafluoroethylene production according to claim 1, wherein the desalted water elevated tank is provided with a water replenishing quick-cutting valve, a water draining quick-cutting valve and a liquid level meter.
4. The automated control method for heat recovery in tetrafluoroethylene production according to claim 1, wherein the desalinated water elevated tank level is set to 50%, and the water replenishing quick-cut valve is closed when the set value is reached; during operation, the drain quick-cut valve opens the drain when the liquid level is above 85%.
5. An automated control method for heat recovery in tetrafluoroethylene production according to claim 1, wherein the heat is controlled to operate at constant temperature via each valve interlock and is delivered to each customer site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423033.3A CN114111420B (en) | 2021-11-26 | 2021-11-26 | Automatic control system and method for heat recovery in tetrafluoroethylene production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423033.3A CN114111420B (en) | 2021-11-26 | 2021-11-26 | Automatic control system and method for heat recovery in tetrafluoroethylene production |
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| Publication Number | Publication Date |
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| CN114111420A CN114111420A (en) | 2022-03-01 |
| CN114111420B true CN114111420B (en) | 2023-12-26 |
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| CN202111423033.3A Active CN114111420B (en) | 2021-11-26 | 2021-11-26 | Automatic control system and method for heat recovery in tetrafluoroethylene production |
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| CN2502228Y (en) * | 2001-08-24 | 2002-07-24 | 广州市达德技术发展有限公司 | Hot water energy-saving device using waste heat automatic controlled by computer |
| CA2671813A1 (en) * | 2008-08-04 | 2010-02-04 | Premark Feg L.L.C. | Warewasher with water energy recovery system |
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| CN206724751U (en) * | 2017-05-03 | 2017-12-08 | 北京澳柯清洁煤气工程技术有限公司 | Coal gas cooling system with waste heat recovery and cooling water circulation |
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| CN213066618U (en) * | 2020-09-09 | 2021-04-27 | 金川集团股份有限公司 | Double-section waste heat recycling device |
-
2021
- 2021-11-26 CN CN202111423033.3A patent/CN114111420B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2502228Y (en) * | 2001-08-24 | 2002-07-24 | 广州市达德技术发展有限公司 | Hot water energy-saving device using waste heat automatic controlled by computer |
| CA2671813A1 (en) * | 2008-08-04 | 2010-02-04 | Premark Feg L.L.C. | Warewasher with water energy recovery system |
| CN203132416U (en) * | 2012-12-20 | 2013-08-14 | 上海蕲黄节能环保设备有限公司 | Waste-heat-recovery constant-temperature water heating system |
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| TR201813385A2 (en) * | 2018-09-18 | 2019-03-21 | Hamit Memur | HAMITA DEVICE, START-STOP COMBI, DEVICE TO OPERATE COMBI IN USE WITH START / STOP SYSTEM, EQUIPMENT TO OPERATE THE EXISTING COMBIES ON THE PRODUCTION LINE WITH THE START / STOP SYSTEM, THE EQUIPMENT THAT USES THE START / STOP SYSTEM, THE EQUIPMENT THAT USES THE START / STOP SYSTEM. |
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| CN213066618U (en) * | 2020-09-09 | 2021-04-27 | 金川集团股份有限公司 | Double-section waste heat recycling device |
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| CN114111420A (en) | 2022-03-01 |
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