CN105485710A - Air preheating method for waste sulfuric acid splitting process - Google Patents
Air preheating method for waste sulfuric acid splitting process Download PDFInfo
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- CN105485710A CN105485710A CN201410526787.5A CN201410526787A CN105485710A CN 105485710 A CN105485710 A CN 105485710A CN 201410526787 A CN201410526787 A CN 201410526787A CN 105485710 A CN105485710 A CN 105485710A
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- sulfuric acid
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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
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Abstract
The invention belongs to the technical field of chemical engineering processes, and is a technological process for preheating combustion air entering a waste sulfuric acid splitting furnace. The air preheating method is realized by the following technical scheme: air needed in the waste sulfuric acid splitting treatment process is blown in a system through an air fan; and the blown air enters the splitting furnace for participating in reaction after being preheated by an air preheater. A hot air return pipe is additionally arranged on an air pipe in front of the splitting furnace, and is connected with an air fan inlet pipe, so that cold and hot air is mixed before entering an air fan, and is conveyed into the air preheater through a hot fan; and a valve is arranged on the added pipe for flow control. The air fan is a hot fan capable of conveying air of 200 DEG C. The air preheating method has the maximum characteristic of radically solving the problem of acid corrosion of a heat exchange tube of the air preheater in the waste sulfuric acid splitting treatment process, and needs no additional energy consumption.
Description
Technical field
The invention belongs to chemical process technical field, is a kind of for the technological process entering Waste Sulfuric Acid pyrolysis furnace combustion air and carry out preheating.
Background technology
At present, in the Waste Sulfuric Acid cracking project 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, sulfur dioxide flue gas in heat exchanger tube is made to occur dew point corrosion, heat exchanging pipe forms acid corrosion, heat exchanger tube can be made time serious to occur damaged, cause device normally not run.
Summary of the invention
Realize avoiding the heat exchanger tube of air preheater to occur dew point corrosion in Waste Sulfuric Acid cracking flow process by the present invention, and do not need additional energy consumption.
Air required in Waste Sulfuric Acid cracking handling process blasts system by air 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: for the air preheat method of Waste Sulfuric Acid cracking technology, it is characterized in that in Waste Sulfuric Acid cracking handling process, refluxing portion mixes with normal temperature air through the air of preheating, enter air preheater by carrying the air-heater of high temperature air and carry out heat exchange, introduce normal temperature air amount by the dense control of oxygen in flue gas, reflux heat air capacity is by air temperature control after mixing, and warm consumes without the need to outer energization.
Usually, described method is mixed with normal temperature air by refluxing portion preheated air, makes the air themperature entering air preheater reach 170 DEG C.
Described normal temperature air amount is by the dense automatic control of the oxygen of sulfur dioxide flue gas.
Described reflux heat air capacity controls automatically by mixing rear air themperature.
Air duct before entering pyrolysis furnace is set up a hot air reflow pipeline, be connected with air blower inlet pipeline, utilize the negative pressure of fan inlet pipeline to make part hot air reflow.The hot-air of backflow mixes with the normal temperature air introduced from air, then delivers into air preheater by air-heater.Set up and hot air reflow pipeline arranges valve carry out flow-control.Air blower is to carry the air-heater of high temperature air.
Maximum feature of the present invention is the problem of the heat exchanger tube generation acid corrosion fundamentally solving air preheater in Waste Sulfuric Acid cracking handling process, and consumes without the need to outer energization.
The inventive method has following characteristics:
(1) intake of fan inlet normal temperature air is regulated according to the oxygen concentration on flue after cooling;
(2) quantity of hot air of backflow is regulated according to the mixed temperature of hot and cold air;
(3) the rear flue-gas temperature of cooling is controlled, to avoid occurring the too low generation dew point corrosion of flue-gas temperature by air preheater by-pass.
Maximum feature of the present invention is to achieve entering Waste Sulfuric Acid pyrolysis furnace preheating of air by this flow process; reclaim partial fume heat energy; save fuel consumption, and it is too low and occur dew point corrosion fundamentally to avoid flue gas local, protects air preheater heat exchanger tube.
Accompanying drawing explanation
Fig. 1 is that the embodiment of the present invention is to the process chart entering the preheating of Waste Sulfuric Acid pyrolysis furnace combustion air.
In figure, 1-air preheater; 2-air-heater; The dense detector of 3-oxygen; The thermocouple that 4-band controls; 5-thermocouple; 6-reflux heat air self-adjusting valve; 7-normal temperature air self-adjusting valve.
Fig. 2 is that the present invention is to the general flow chart entering the preheating of Waste Sulfuric Acid pyrolysis furnace combustion air.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Embodiment: the present embodiment air preheat technological process as shown in Figure 1.
In the present embodiment, Waste Sulfuric Acid cracking common property is raw per hour containing sulfur dioxide flue gas amount 478kmol/h(kilomol), the sulfur dioxide flue gas temperature gone out from waste heat boiler is 580 DEG C, after cooling, sulfur dioxide flue gas temperature is 380 DEG C, in sulfur dioxide flue gas, oxygen concentration is about 8%, and normal temperature air amount is 300kmol/h, and reflux heat air and the mixed air themperature of normal temperature air are 170 DEG C, going out air preheater hot air temperature is 530 DEG C, and reflux heat air capacity is 112kmo/h.Because in flue gas, oxygen is dense is important Con trolling index in Waste Sulfuric Acid cracking, so the normal temperature air amount of needs per hour is by the dense detector 3 of oxygen and normal temperature air self-adjusting valve 7 auto-adjustment control.Reflux heat air capacity is by mixing rear air themperature and return air self-adjusting valve auto-adjustment control.
As can be seen from embodiment, the present invention can realize the preheating 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, and the present invention consumes without the need to another energization.
Claims (6)
1. the air preheat method for Waste Sulfuric Acid cracking technology, it is characterized in that in Waste Sulfuric Acid cracking handling process, refluxing portion mixes with normal temperature air through the air of preheating, enter air preheater by carrying the air-heater of high temperature air and carry out heat exchange, introduce normal temperature air amount by the dense control of oxygen in flue gas, reflux heat air capacity is by air temperature control after mixing, and warm consumes without the need to outer energization.
2. the method for claim 1, it is characterized in that the air duct before entering pyrolysis furnace being set up a hot air reflow pipeline, be connected with air blower inlet pipeline, the negative pressure of fan inlet pipeline is utilized to make part hot air reflow, the hot-air of backflow mixes with the normal temperature air introduced from air, deliver into air preheater by air-heater again, set up and hot air reflow pipeline arranges valve carry out flow-control.
3. method as claimed in claim 1 or 2, is characterized in that air blower is the air-heater of conveying high temperature air.
4. method as claimed in claim 1 or 2, be is characterized in that being mixed with normal temperature air by refluxing portion preheated air, makes the air themperature entering air preheater reach 170 DEG C.
5. method as claimed in claim 1 or 2, is characterized in that normal temperature air amount is by the dense automatic control of the oxygen of sulfur dioxide flue gas.
6. method as claimed in claim 1 or 2, is characterized in that reflux heat air capacity controls automatically by mixing rear air themperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410526787.5A CN105485710A (en) | 2014-10-09 | 2014-10-09 | Air preheating method for waste sulfuric acid splitting process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410526787.5A CN105485710A (en) | 2014-10-09 | 2014-10-09 | Air preheating method for waste sulfuric acid splitting process |
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| CN105485710A true CN105485710A (en) | 2016-04-13 |
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| CN201410526787.5A Pending CN105485710A (en) | 2014-10-09 | 2014-10-09 | Air preheating method for waste sulfuric acid splitting process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765202A (en) * | 2016-12-19 | 2017-05-31 | 扬州嘉明环保科技有限公司 | It is the waste heat utilization system and method for the spent acid pyrolysis furnace of raw material containing organic Waste Sulfuric Acid |
| CN106766953A (en) * | 2016-12-21 | 2017-05-31 | 中石化南京工程有限公司 | A kind of phosphorous Waste Sulfuric Acid cracking waste heat Application way |
| 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 |
| CN109579041A (en) * | 2018-11-12 | 2019-04-05 | 上海理工大学 | Low ash high calcium coal soil resistant, slagging boiler air preheater and combustion method |
| CN112694066A (en) * | 2019-10-23 | 2021-04-23 | 中国石油化工股份有限公司 | Waste sulfuric acid liquid oxygen cracking system and cracking method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106765202A (en) * | 2016-12-19 | 2017-05-31 | 扬州嘉明环保科技有限公司 | It is the waste heat utilization system and method for the spent acid pyrolysis furnace of raw material containing organic Waste Sulfuric Acid |
| CN106766953A (en) * | 2016-12-21 | 2017-05-31 | 中石化南京工程有限公司 | A kind of phosphorous Waste Sulfuric Acid cracking waste heat Application way |
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| 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 |
| CN109579041A (en) * | 2018-11-12 | 2019-04-05 | 上海理工大学 | Low ash high calcium coal soil resistant, slagging boiler air preheater and combustion method |
| CN112694066A (en) * | 2019-10-23 | 2021-04-23 | 中国石油化工股份有限公司 | Waste sulfuric acid liquid oxygen cracking system and cracking method |
| CN112694066B (en) * | 2019-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Waste sulfuric acid liquid oxygen cracking system and cracking method |
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Application publication date: 20160413 |
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