CN105570923A - Air heating method for waste acid splitting and recovery technology - Google Patents
Air heating method for waste acid splitting and recovery technology Download PDFInfo
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- CN105570923A CN105570923A CN201410526927.9A CN201410526927A CN105570923A CN 105570923 A CN105570923 A CN 105570923A CN 201410526927 A CN201410526927 A CN 201410526927A CN 105570923 A CN105570923 A CN 105570923A
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- pressure steam
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention belongs to the technical field of chemical process and provides an air heating technology process preventing corrosion due to air preheater leakage during the waste acid splitting and recovery technology. The air heating method for waste acid splitting and recovery technology is characterized in that during waste acid splitting technology, combustion air entering a system exchanges heat with low-pressure steam produced by a waste heat boiler; normal temperature air is heated and then enters a heat exchanger of the system to exchange heat with splitting furnace air; the temperature of the normal temperature air after heating can be controlled by low-pressure steam amount; and the air heating method for waste acid splitting and recovery technology can be conveniently operated and extra energy loss can be avoided.
Description
Technical field
The invention belongs to chemical process technical field, is a kind of for preventing the technological process of the air heat of air preheater generation dew point corrosion in spent acid cracking recovery process.
Background technology
At present, in the spent acid cracking technology of domestic application, utilize the flue gas self heat after cracking to heat the combustion air entering pyrolysis furnace, thus reach the object of fuel saving consumption, greatly reduce the operating cost of Waste Sulfuric Acid cracking process.Existing heated air flow journey utilizes air preheater (equipment of air and flue gas heat exchange) to be heated by air, and sulfur dioxide flue gas walks tube side, and air walks shell side.Because the air themperature entering air preheater is normal temperature in this heating procedure, cause in the air intlet place heat exchanger tube wall temperature of air preheater too low, make the dew point corrosion phenomenon occurring sulfur dioxide flue gas in heat exchanger tube, corrosion heat exchanger tube, the afterbody of heat exchanger tube can be made time serious to occur damaged, cause air preheater not long for service life, device can not normally run.
Summary of the invention
Realize avoiding the heat exchanger tube of air preheater to occur dew point corrosion phenomenon in the existing technological process of spent acid cracking by the present invention, and easy to operate, do not need additional energy consumption.
Air required in spent acid cracking treatment process blasts system by centrifugal blower, and the air blasted enters pyrolysis furnace and participates in reaction as combustion air after air preheater preheating.
The present invention is realized by following technical scheme: in spent acid cracking technology, enters the low-pressure steam that intrasystem combustion air and waste heat boiler produce and carries out heat exchange, and normal temperature air is carried out heat exchange by the heat exchanger and cracking furnace gas entering system after heating again.Normal temperature air is controlled by the amount of low-pressure steam by the temperature after heating.
Before normal temperature air enters air preheater, the low-pressure steam that normal temperature air and waste heat boiler produce first is carried out heat exchange in heat exchange of heat pipe, make normal temperature air be heated to 150 DEG C-170 DEG C and enter follow-up air preheater, low-pressure steam gets back to the deaerated water system of waste heat boiler.
Because the air capacity adopting fuel difference can make to need in pyrolysis furnace is different, therefore on low pressure steam line, install control valve group interlock mutually with the temperature thermocouple gone out on the air duct of heat exchange of heat pipe, the amount according to steam regulation regulates the temperature adding hot-air.Reasonable saving utilizes thermal source.
The acid dew piont corrosion problem that the heat exchanger tube that maximum feature of the present invention is fundamentally to solve air preheater in spent acid cracking technology flow process occurs, and operate easy to adjust.
The inventive method has following characteristics:
(1) fuel type used due to system enriches and causes required air capacity can change to some extent with the difference of fuel, therefore regulates the amount of the low-pressure steam into heat exchange of heat pipe according to air capacity.
(2) the control valve group on low-pressure steam pipeline and the temperature thermocouple gone out on the air duct of heat exchange of heat pipe are connected, and reduce the supply of steam when air themperature is more than 170 DEG C, when air themperature is lower than the supply increasing steam when 150 DEG C;
It is too low and occur the problem of dew point corrosion that maximum feature of the present invention is fundamentally to avoid air preheater tube side local temperature in cracking recovery process by this flow process, protects air preheater.
Accompanying drawing explanation
Fig. 1 is the process chart of embodiment of the present invention air heat.
In figure, 1-air centrifugal blower; 2-heat exchange of heat pipe; 3-air preheater; 4-steam control valve group; 5-temperature thermocouple.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Embodiment: the technological process of the present embodiment air heat as shown in Figure 1.
In the present embodiment, from spent acid pyrolysis furnace containing sulfur dioxide flue gas through being 550 DEG C-580 DEG C from the flue-gas temperature after waste heat boiler, after air preheater, sulfur dioxide flue gas temperature is 350 DEG C-380 DEG C.Normal temperature air enters heat exchange of heat pipe through centrifugal blower, enters air preheater after temperature reaches 150 DEG C-170 DEG C after carrying out heat exchange with low-pressure steam.The air themperature going out heat pipe heat exchanging regulates by regulating the low-pressure steam of 1.0 or 1.5MPa into heat exchange of heat pipe.The supply of steam is reduced, when air themperature is lower than the supply increasing steam when 150 DEG C when air themperature is more than 170 DEG C.Deaerated water system is returned after low-pressure steam heat exchange.
As can be seen from embodiment, this technological process can realize the heating to the normal temperature air entering air preheater, thus it is too low in air intlet place temperature to avoid air preheater, there is the situation of dew point corrosion in heat exchanger tube, extend the equipment life of air preheater, ensure that the stable operation of whole Waste Sulfuric Acid cracker.
Claims (3)
1. one kind for the air heat method in spent acid cracking recovery process, it is characterized in that in spent acid cracking technology, enter the low-pressure steam that intrasystem combustion air and waste heat boiler produce and carry out heat exchange, normal temperature air is carried out heat exchange by the heat exchanger and cracking furnace gas entering system after heating again, and normal temperature air is controlled by the amount of low-pressure steam by the temperature after heating.
2. the method for claim 1, it is characterized in that by adopting heat exchange of heat pipe to make normal temperature air and low-pressure steam carry out heat exchange, the temperature 150 DEG C-170 DEG C that normal temperature air is heated to technological requirement enters follow-up system, and low-pressure steam turns back to the deaerated water system of waste heat boiler.
3. the method for claim 1, it is characterized in that normal temperature air is controlled by the amount of low-pressure steam by the temperature after heating, low pressure steam line is installed control valve group to interlock mutually with the temperature thermocouple gone out on the air duct of heat exchange of heat pipe, controlled by the self-adjusting valve group on low-pressure steam transfer pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410526927.9A CN105570923A (en) | 2014-10-09 | 2014-10-09 | Air heating method for waste acid splitting and recovery technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410526927.9A CN105570923A (en) | 2014-10-09 | 2014-10-09 | Air heating method for waste acid splitting and recovery technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105570923A true CN105570923A (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410526927.9A Pending CN105570923A (en) | 2014-10-09 | 2014-10-09 | Air heating method for waste acid splitting and recovery technology |
Country Status (1)
| Country | Link |
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| CN (1) | CN105570923A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023814A (en) * | 2017-04-25 | 2017-08-08 | 江苏科瑞工程设计有限公司 | The exhaust heat recovering method and equipment of the high-temperature flue gas containing strong corrosive medium in spent acid cracking |
| CN107143863A (en) * | 2017-03-24 | 2017-09-08 | 中石化南京工程有限公司 | A kind of spent acid cracking power-economizing method and system |
| CN108167844A (en) * | 2018-01-05 | 2018-06-15 | 江苏科瑞工程设计有限公司 | A kind of method of the air preheat of spent acid cracking technology |
| CN112146097A (en) * | 2020-09-18 | 2020-12-29 | 南京合工智能环保研究院有限公司 | Heat exchange device and heat exchange method for waste acid cracking acid making process |
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|---|---|---|---|---|
| JP2004101069A (en) * | 2002-09-10 | 2004-04-02 | Mitsubishi Heavy Ind Ltd | Temperature controller in incinerator and temperature control method |
| CN202419687U (en) * | 2011-12-15 | 2012-09-05 | 攀钢集团攀枝花钢钒有限公司 | System capable of avoiding low-temperature corrosion of air pre-heater of gas boiler |
| CN203810913U (en) * | 2014-02-17 | 2014-09-03 | 北京华福神雾工业炉有限公司 | Petrochemical-industry tubular heating furnace with regenerative burners |
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2014
- 2014-10-09 CN CN201410526927.9A patent/CN105570923A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101069A (en) * | 2002-09-10 | 2004-04-02 | Mitsubishi Heavy Ind Ltd | Temperature controller in incinerator and temperature control method |
| CN202419687U (en) * | 2011-12-15 | 2012-09-05 | 攀钢集团攀枝花钢钒有限公司 | System capable of avoiding low-temperature corrosion of air pre-heater of gas boiler |
| CN203810913U (en) * | 2014-02-17 | 2014-09-03 | 北京华福神雾工业炉有限公司 | Petrochemical-industry tubular heating furnace with regenerative burners |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107143863A (en) * | 2017-03-24 | 2017-09-08 | 中石化南京工程有限公司 | A kind of spent acid cracking power-economizing method and system |
| CN107023814A (en) * | 2017-04-25 | 2017-08-08 | 江苏科瑞工程设计有限公司 | The exhaust heat recovering method and equipment of the high-temperature flue gas containing strong corrosive medium in spent acid cracking |
| CN108167844A (en) * | 2018-01-05 | 2018-06-15 | 江苏科瑞工程设计有限公司 | A kind of method of the air preheat of spent acid cracking technology |
| CN112146097A (en) * | 2020-09-18 | 2020-12-29 | 南京合工智能环保研究院有限公司 | Heat exchange device and heat exchange method for waste acid cracking acid making process |
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Application publication date: 20160511 |