CN103185464A - Waste heat recovery system of pipe heater - Google Patents
Waste heat recovery system of pipe heater Download PDFInfo
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- CN103185464A CN103185464A CN2011104591257A CN201110459125A CN103185464A CN 103185464 A CN103185464 A CN 103185464A CN 2011104591257 A CN2011104591257 A CN 2011104591257A CN 201110459125 A CN201110459125 A CN 201110459125A CN 103185464 A CN103185464 A CN 103185464A
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- air
- temperature
- process device
- preheating process
- preheater
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a waste heat recovery system of a pipe heater, which comprises a blower, a preposed preheater and an air preheating device, wherein the preposed preheater is arranged at the inlet or the outlet of a blower, the outlet of the preposed preheater is connected with the inlet of the air preheating device, cold air enters into the preposed preheater after entering into the blower, then is discharged after being heated by the preposed preheater, and finally enters into the air preheating device. Therefore, in the invention, by adding the preposed preheater, a heat source is introduced to heat for increasing the temperature of air and the temperature of air entering into the air preheating device is increased. With the temperature increment of a wall at the air inlet part of the air preheating device, heat is transferred to a flue gas outlet part through heat transmission. Therefore, the temperature at the flue gas outlet can be increased, flue gas dew point corrosion temperature can be avoided, and the effect of preventing flue gas dew point corrosion can be achieved.
Description
Technical field
The present invention relates to a kind of petrochemical industry waste heat of flue gas of heating furnace and reclaim the field, particularly relate to a kind of front preheating process device and air preheater tubular heater residual neat recovering system of being provided with, can solve in the winter time, because temperature is very low, cause that not only air preheater air intlet position wall temperature temperature is low but also exhanst gas outlet position wall temperature temperature is low, thereby cause in exhanst gas outlet position temperature lowly excessively, dew point corrosion takes place easily, equipment is caused unnecessary problems such as corrosion influence.
Background technology
Along with oil refining industry feedstock oil character becomes heavy day by day, being on the increase of sulfur content of raw material, as domestic petroleum chemical enterprise waste heat of flue gas of heating furnace reclaim emphasis equipment---the quality of air preheater operational effect more and more is subjected to the attention of enterprise.In the production run of heating furnace, it is serious day by day that air preheater flue gas circulation passage often because of the accumulation of flue gas black dirt blocking problem takes place.The flue gas ash deposit and slag buildup is usually all multifactor relevant with the structural configuration of fuel type, combustion characteristics, stove thermic load, air velocity, heating surface etc.In case the heating surface dust stratification will seriously influence the heat-transfer effect of heating surface.Have statistics to show: under to flow area ash serious situation, the heat-transfer capability of air preheater approximately reduces by 30%～50%, and this will make the thermal efficiency of heating furnace reduce more than 5%; Because the fuel energy consumption of heating furnace accounts for 30%～40% of oil refining enterprise total energy consumption, be not difficult to find out: the flue gas ash deposit and slag buildup has strengthened enterprise energy consumption, has influenced ordinary production, has shortened on-stream time.
In the last few years, the continuous development of various places Petrochemical Enterprises energy-saving and emission-reduction work required the exhaust gas temperature of heating furnace more and more lower, and the low-temperature dew point corrosion problem of flue gas becomes increasingly conspicuous.Since unavoidably contain a spot of sulphur in the general fuel oil of refinery or the fuel gas, combustion of sulfur generates SO
2, further generate SO
3When exhaust gas temperature is reduced to below 400 ℃, SO
3Just with flue gas in steam chemical combination generate sulfuric acid vapor.In further reduction process of exhaust gas temperature, sulfuric acid vapor condenses gradually that condensation becomes liquid.Because the existence of sulfate liquid, the dust in the flue gas is become not wet ash, the sticking dirt of easy to clean by adhesion on the one hand, causes the obstruction of exhaust gases passes; The acid liquid corrosion apparatus body causes steel construction generation chemical attack on the other hand.
Along with deepening continuously that the petrochemical industry energy-saving and emission-reduction require, the air preheater technology is towards the heat exchange efficiency height, and several preheater module combinations directions develop, and be embodied in: exhaust gas temperature is more and more lower, thermal efficiency of heating furnace is more and more higher.After exhaust gas temperature was reduced to 120 ℃～130 ℃, the dew point section of cold end corrosion occurred, and can cause corrosion to the steel construction of air preheater body.
Existing waste heat recovery system of heating furnace, the ash deposit and slag buildup of flue gas and dew point corrosion problem serious and, exhaust gas temperature is higher, can not realize environmental protection; The temperature that is unfavorable for combustion air.
This shows that above-mentioned existing tubular heater residual neat recovering system obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of tubular heater residual neat recovering system, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, a kind of tubular heater residual neat recovering system is provided, by increasing the front preheating process device, introduce thermal source air heat is heated up, improve the temperature that air enters air preheater.Along with the rising of air preheater air intlet position wall temperature, by the heat transmission heat is passed to the outlet position of flue gas, can promote the outlet side temperature of flue gas like this, avoid the flue gas dew point corrosion temperature, thereby reach the effect that prevents the flue gas dew point corrosion.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.A kind of tubular heater residual neat recovering system according to the present invention's proposition, it comprises air blast, front preheating process device and air preheater, described front preheating process device is arranged at import department or the exit of described air blast, the outlet of described front preheating process device is connected with the import of described air preheater, cold air is through behind the described air blast, enter described front preheating process device, after described front preheating process device heating, discharge, enter air preheater at last.
Purpose of the present invention and solve its technical problem and can also be further achieved by the following technical measures.
Aforesaid tubular heater residual neat recovering system, wherein said front preheating process device is finned tube exchanger or tube bundle heat exchanger.
Aforesaid tubular heater residual neat recovering system, the thermal source in the described front preheating process device is hot water or steam.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, tubular heater residual neat recovering system of the present invention has following advantage and beneficial effect at least: the present invention is by increasing the front preheating process device, introduce thermal source air heat is heated up, improving the temperature that air enters air preheater.Along with the rising of air preheater air intlet position wall temperature, by the heat transmission heat is passed to the outlet position of flue gas, can promote the outlet side temperature of flue gas like this, avoid the flue gas dew point corrosion temperature, thereby reach the effect that prevents the flue gas dew point corrosion.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the structural representation of tubular heater residual neat recovering system of the present invention.
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its specific embodiment of tubular heater residual neat recovering system, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
See also shown in Figure 1ly, be the structural representation of tubular heater residual neat recovering system of the present invention.The tubular heater residual neat recovering system comprises air blast 1, front preheating process device 2 and air preheater 3.
As shown in Figure 1, above-mentioned front preheating process device 2 is arranged at import department or the exit of air blast 1, and the outlet of front preheating process device 2 is connected with the import of air preheater 3, cold air is through behind the air blast 1, enter front preheating process device 2, after 2 heating of front preheating process device, discharge, enter air preheater 3 at last.
In the present invention, front preheating process device 2 adopts finned tube exchanger (hot water and air are walked tube side and shell side respectively), and the thermal source of front preheating process device 2 can adopt hot water; The thermal source that has adopts steam, and front preheating process device 2 can be selected tube bundle heat exchanger for use at this moment.Specifically select for use which kind of thermal source to depend on on-the-spot condition and on-the-spot ability.
The present invention is when practical application, and extraneous cold air enters front preheating process device 2 through behind the air blast 1.Front preheating process device essence is a finned tube exchanger: introduce hot water (90 ℃ are example) and be thermal source, the tube side heat release that enters fin; Air (0 ℃ is example) enters from bottom to top, because the existence of temperature difference, the heat of hot water passes to air by finned tube, the absorption of air heat, and temperature is elevated to (30 ℃) back and discharges the front preheating process device, enters air preheater 3; Hot water temperature after continuous heat release is reduced to (50 ℃), enters water return pipeline.Below be an embodiment:
0 ℃ → front preheating process of outside air device 2 → absorption heat temperature rising → air is gone into air preheater 3 for 30 ℃
90 ℃ → front preheating process of hot water device 2 → emit heat temperature reduction → cold water to enter water return pipeline for 50 ℃
Through as can be known last, utilize 90 ℃ of temperature differences that high-temperature-hot-water and extraneous low temperature cold air have as the power of heat exchange just, the high-temperature-hot-water front preheating process device 2 of flowing through, until being discharged, temperature has dropped to 50 ℃ length by length from 90 ℃; Corresponding therewith, cool ambient air is passed through this front preheating process device 2 successively, constantly absorbs heat, and temperature constantly rises up to 30 ℃, enters air preheater 3.In the winter time, the air that is elevated to uniform temperature just enters air preheater 3, participates in the heat exchange with flue gas, this part heat transferred flue gas, make exhaust gas temperature obtain the rising of part, thereby avoided the appearance of flue gas low-temperature dew point corrosion temperature.The discharging flue-gas temperature only otherwise in the dew point corrosion interval, just reach the basic purpose of this patent has protected equipment not to be subjected to the influence of flue gas corrosion.
Return the above, tubular heater residual neat recovering system of the present invention also possesses following advantage:
1, the present invention utilizes several air preheaters commonly used in the industry will go out the cooling high-temperature fume of heating furnace earlier, especially in the winter time in the environment that temperature is very low, improve wall temperature by the method that improves the preheater temperature of inlet air, and then the wall temperature of lifting exhanst gas outlet side, can partly improve exhaust gas temperature.Exhaust gas temperature is improved, just avoided prolonging the cold end corrosion temperature of flue gas, thereby reduce the influence of flue gas corrosion.
2, by increasing the front preheating process device, import certain thermal source, make air absorption portion heat in the front preheating process device, promote the temperature of air.
3, can select the installation position of front preheating process device flexibly according to the condition at scene, only need do adaptive local flow improvement to the air channel.The front preheating process device can be installed at original blower inlet, also can be installed in above the outlet air channel of air blast.Preceding a kind of scheme advantage is that the installation site is abundant, maintenance is convenient, and deficiency is that the load of air blast can increase; The load of air blast is constant substantially in a kind of scheme in back, and deficiency is that the installation site is limited, and the flow pattern of air is bad.Specifically select for use the sort of form to need the field condition analysis-by-synthesis to decide.
4, the present invention not only can be used as the rising air themperature and uses, and under some process conditions, also can be used as cooling to hot fluid and uses.Such as in device for producing hydrogen, some acid water exhaust temperatures higher (90 ℃-100 ℃) need air cooling.We just can guide to the acid water of this part high temperature the air intlet place of heating furnace, utilize cold air in the front preheating process device acid water to be lowered the temperature.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art are not in breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (3)
1. tubular heater residual neat recovering system, it is characterized in that it comprises air blast, front preheating process device and air preheater, described front preheating process device is arranged at import department or the exit of described air blast, the outlet of described front preheating process device is connected with the import of described air preheater, cold air is through behind the described air blast, enter described front preheating process device, after described front preheating process device heating, discharge, enter described air preheater at last.
2. tubular heater residual neat recovering system according to claim 1 is characterized in that described front preheating process device is finned tube exchanger or tube bundle heat exchanger.
3. tubular heater residual neat recovering system according to claim 1 is characterized in that the thermal source in the described front preheating process device is hot water or steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104591257A CN103185464A (en) | 2011-12-31 | 2011-12-31 | Waste heat recovery system of pipe heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104591257A CN103185464A (en) | 2011-12-31 | 2011-12-31 | Waste heat recovery system of pipe heater |
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| Publication Number | Publication Date |
|---|---|
| CN103185464A true CN103185464A (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104591257A Pending CN103185464A (en) | 2011-12-31 | 2011-12-31 | Waste heat recovery system of pipe heater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471410A (en) * | 2013-09-17 | 2013-12-25 | 李�杰 | Residual heat recycling method and system for fuel heating furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793766A (en) * | 2006-01-05 | 2006-06-28 | 中国石油化工集团公司 | Tube type heating furnace |
| CN200972137Y (en) * | 2006-11-15 | 2007-11-07 | 上海宁松热能环境工程有限公司 | Combined water thermal media air preheater |
| CN201170698Y (en) * | 2007-12-17 | 2008-12-24 | 大连熵立得传热技术有限公司 | Hot oil split type preposition preheater |
| CN201293568Y (en) * | 2008-08-02 | 2009-08-19 | 大连熵立得传热技术有限公司 | Hot blast intermediate reflux low temperature corrosion resistant air preheater |
| CN201992682U (en) * | 2011-03-02 | 2011-09-28 | 张玉伟 | Cold end heat-accumulating plate corrosion resistant system for rotary air preheater |
-
2011
- 2011-12-31 CN CN2011104591257A patent/CN103185464A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793766A (en) * | 2006-01-05 | 2006-06-28 | 中国石油化工集团公司 | Tube type heating furnace |
| CN200972137Y (en) * | 2006-11-15 | 2007-11-07 | 上海宁松热能环境工程有限公司 | Combined water thermal media air preheater |
| CN201170698Y (en) * | 2007-12-17 | 2008-12-24 | 大连熵立得传热技术有限公司 | Hot oil split type preposition preheater |
| CN201293568Y (en) * | 2008-08-02 | 2009-08-19 | 大连熵立得传热技术有限公司 | Hot blast intermediate reflux low temperature corrosion resistant air preheater |
| CN201992682U (en) * | 2011-03-02 | 2011-09-28 | 张玉伟 | Cold end heat-accumulating plate corrosion resistant system for rotary air preheater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471410A (en) * | 2013-09-17 | 2013-12-25 | 李�杰 | Residual heat recycling method and system for fuel heating furnace |
| CN103471410B (en) * | 2013-09-17 | 2015-11-18 | 李�杰 | A kind of fuel heating furnace waste heat recycle method and system |
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Application publication date: 20130703 |