CN104232145A - Gas circular preheating device and process for delayed coking coke tower - Google Patents
Gas circular preheating device and process for delayed coking coke tower Download PDFInfo
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- CN104232145A CN104232145A CN201410228579.7A CN201410228579A CN104232145A CN 104232145 A CN104232145 A CN 104232145A CN 201410228579 A CN201410228579 A CN 201410228579A CN 104232145 A CN104232145 A CN 104232145A
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Abstract
The invention relates to gas circulating preheating device and process for a delayed coking coke tower. The gas circulating preheating device comprises two coke towers, an electric heater and a variable-frequency circulating fan, wherein the top and the bottom of each coke tower are connected with the electric heater and the variable-frequency circulating fan by virtue of pipelines to form a closed loop; heat exchange equipment is arranged on the tower walls between lower cone girth joints of the two coke towers and the upper edges of coking layers of the coke towers and is communicated with the circulating fan through circulating pipelines, so as to form a sealed loop; and the circulating fan drives the gas to circulate in the closed loops to preheat the coke towers. Compared with an existing coke tower preheating process, the device and process which are disclosed by the invention has the advantages that the coke towers are safely preheated to the required operation temperature by adopting heat outside a production system of a delayed coking device, so that the periodic fluctuation of the device is reduced, the service life of the coke towers is prolonged, the liquid yield of the device is increased, the product quality is improved, and lots of defects caused by batch production of the delayed coking device coke tower are optimized.
Description
Technical field
The present invention relates to technical field of petrochemical industry, be specifically related to device and the technique of Coking Tower for Delayed Coking Unit preheating flow process.
Background technology
The delayed coking unit of current petrochemical industry, the flow process of the preheating of its coke drum opens the ball collar valve of new column overhead, the high-temperature oil gas of producing tower flows to heat exchange post liquefaction at the bottom of tower from the tower top of new tower, enter and get rid of oil tank and be preheating to about 330 DEG C to Xin Tata wall, the temperature after preheating in coke drum is presented height and is bent down distribution.
This nothing blocks up burnt valve coke drum pre-heating technique, generally needs 6 hours, by the high-temperature oil gas of producing tower, new tower is preheating to about 330 DEG C, and when cutting tower, feeding temperature is 487 DEG C, and the difference variation of moment 150 DEG C can cause damage by STRENGTH ON COKE tower, reduces the work-ing life of coke drum; Meanwhile, the envrionment temperature of about 330 DEG C, new tower, can not meet the heat of required absorption during residual oil thermo-cracking, residual oil heat scission reaction is insufficient; So cause coke drum to cut material balance and the heat balance destruction of whole system before and after tower, cause the cyclic fluctuation of apparatus system, add the operation easier of device, reduce liquid to receive, reduce the control accuracy of quality product, add the coke powder carrying amount of system, and cause the unnecessary loss of heat energy, increase the coking rate of furnace tubing; For the coke drum of non-Chrome molybdenum steel material, under the long-term alternating temperature operational condition of coke drum high temperature, high burnt position, easily cause the creep of first, second and third road girth sheets of more than coke drum lower cone circumferential weld, shorten the work-ing life of coke drum.
Summary of the invention
The object of the invention is the defect overcoming prior art, material balance and the heat balance of a kind of ballast system provided, improve the quality of products, save energy and reduce the cost, improve that liquid is received, the operation of optimization device system process, and delayed coking coke drum primary heater unit and the technique in coke drum work-ing life can be extended.
For achieving the above object, the present invention includes two coke drums, electric heater and heat-exchange equipment, it is characterized in that, be connected with electric heater and frequency conversion recirculation blower pipeline with bottom at coke drum top, form close loop, described electric heater, to gas heating, promotes gas by frequency conversion recirculation blower or gas by thermogenesis siphon kinetic energy and circulates in close loop, be preheating to the temperature of needs to coke drum; Heat-exchange equipment is equipped with outside tower wall on the lower cone circumferential weld and coke drum focus layer of described two coke drums between edge, heat-exchange equipment is connected with frequency conversion recirculation blower pipeline, form close loop, promote gas by frequency conversion recirculation blower to circulate in close loop, with circulating heat conduction gas producing the waste heat of tower height fire stons oil coke to Xin Tata wall cyclic preheat; Two cover heating facilities can give coke drum preheating individually or simultaneously, and the heat supply mode of coke drum preheating is that production system supplies outward.
Described electric heater is equipped with temperature controlling system.
Described heat-exchange equipment can be that multiple shape system is surrounded on outside described coke drum tower wall, as: water wall, membrane wall and metal tube.
Recycle gas in described close loop comprises various gas.
The present invention compares with existing coke drum preheating flow process, adopt the heat outside delayed coker produces system that coke drum safety is preheating to suitable service temperature, so the material balance of steady apparatus system and heat balance, reduce or avoid crackle and the creep of coke drum Lower Half girth sheets, extending coke drum work-ing life; Reduce the cyclic swing of device; The liquid improving device is received, and improves the control accuracy of quality product, reduces the change of gas speed and the carrying amount of coke powder of system, reduces the coking rate of furnace tubing, shortens coke drum warm up time; Reduce or avoid and get rid of oil (oil that the new tower of preheating produces) formation, save the electric energy consumption of pump, decrease the generation of system sump oil, optimize many drawbacks that Coking Tower for Delayed Coking Unit batch production brings.
Accompanying drawing explanation
Gas circulation preheating facility schematic diagram in a kind of delayed coking coke drum that the embodiment of the present invention shown in Fig. 1 provides;
See Fig. 1,1 is electric heater; 2 is frequency conversion recirculation blower; 3 is strainer; 4 is thermopair; 5 is pressure controlled valve.
The outer gas circulation preheating facility schematic diagram of a kind of delayed coking coke drum that the embodiment of the present invention shown in Fig. 2 provides;
See Fig. 2,1 is edge in coke drum focus layer; 2 is heat-exchange equipment; 3 is lower cone circumferential weld; 4 is thermopair; 5 is pressure controlled valve; 6 is frequency conversion recirculation blower; 7 is thermopair.
Embodiment
In order to make the object of invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, as an embodiment, a kind of delayed coking coke drum gas circulation primary heater unit and technique, two coke drum top are connected with pipeline with electric heater 1, frequency conversion recirculation blower 2, strainer 3 with bottom, form close loop; Steam for the recycle gas in close loop: in the normal preheating flow process of coke drum, steam catches up with air, after pressure testing link, does not become flat, dehydration link, at this moment the pressure of coke drum is about 0.3Mpa; With the through electric heater 1 of the steam in coke drum and frequency conversion recirculation blower 2 place circulation line, steam is discharged from pressure controlled valve 5, allows whole close loop fill interior full steam, and in lower draining, sets up close loop flow process.Start electric heater to heat to close loop inner vapor, promote steam by frequency conversion recirculation blower to circulate in close loop, the heat supply of electric heater 1 and the vapor flow rate of frequency conversion recirculation blower 2 is regulated, to coke drum safe prewarming to the temperature needed according to the temperature of coke drum; Electric heater is equipped with temperature controlling system, precisely can control Heating temperature within positive and negative 1 DEG C.In the process of giving coke drum preheating, the vapor pressure controlled in close loop is no more than Coke Drum Design authorized pressure 0.35MPa.The highest preheating temperature is no more than Coke Drum Design allowable temperature.Be preheating to the temperature of needs at coke drum after, run steam by pressure controlled valve 5, according to the water vapour that the temperature variation of thermopair 4 is drained in coke drum as far as possible, reduce the vapor volume entering fractionating system, in order to avoid increase the unnecessary load of system.Steam in the coke drum that preheating is complete also can be incorporated into old tower and do the little steam steamed out, but will precisely control.
As shown in Figure 2, as an embodiment, on the lower cone circumferential weld 3 and coke drum focus layer of two described coke drums along 1 between tower wall outside be equipped with heat-exchange equipment 2, and be communicated with frequency conversion recirculation blower 6 by circulation line and form close loop; Nitrogen for the recycle gas in close loop: when coke drum starts preheating, the tower wall temperature of producing tower is about 430 DEG C, nitrogen injection in close loop is given by pressure controlled valve 5, startup frequency conversion recirculation blower 6 promotes nitrogen and circulates in close loop, gives new tower preheating with the waste heat of the production of production tower height fire stons oil coke.When the temperature of thermopair 4 and thermopair 7 is similar, stop new tower preheating.
More than the present invention two coke drum preheating embodiments, can give coke drum preheating individually or simultaneously according to operating mode.Temperature after preheating in coke drum presents low high distribution.
Claims (3)
1. a delayed coking coke drum gas circulation primary heater unit and technique, comprise two coke drums, electric heater and heat-exchange equipment, it is characterized in that, coke drum top is connected with electric heater and frequency conversion recirculation blower pipeline with bottom, form close loop, described electric heater, to gas heating, promotes gas by frequency conversion recirculation blower or gas by thermogenesis siphon kinetic energy and circulates in close loop, be preheating to the temperature of needs to coke drum; Heat-exchange equipment is equipped with outside tower wall on the lower cone circumferential weld and coke drum focus layer of described two coke drums between edge, heat-exchange equipment is connected with frequency conversion recirculation blower pipeline, form close loop, promote gas by frequency conversion recirculation blower to circulate in close loop, with producing the waste heat of tower to new tower preheating; Two cover heating facilities can give coke drum preheating individually or simultaneously, and the heat supply mode of preheating is that production system supplies outward.
2. coke drum gas circulation primary heater unit according to claim 1 and technique, is characterized in that, described heat-exchange equipment can be that multiple shape system is surrounded on outside described coke drum tower wall.
3. coke drum gas circulation primary heater unit according to claim 1 and technique, is characterized in that, the recycle gas in described close loop comprises various gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410228579.7A CN104232145B (en) | 2014-05-28 | 2014-05-28 | A kind of delayed coking coke drum gas circulation primary heater unit and technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410228579.7A CN104232145B (en) | 2014-05-28 | 2014-05-28 | A kind of delayed coking coke drum gas circulation primary heater unit and technique |
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| CN104232145A true CN104232145A (en) | 2014-12-24 |
| CN104232145B CN104232145B (en) | 2016-03-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104974782A (en) * | 2015-06-26 | 2015-10-14 | 林永波 | Delayed-coking coke tower outside-system heating and preheating device and technology |
| CN108102688A (en) * | 2017-12-28 | 2018-06-01 | 林永波 | A kind of delayed coking coke drum heat control technique |
| CN109722269A (en) * | 2019-01-16 | 2019-05-07 | 林永波 | A kind of delayed coking coke drum mechanical steam recompression pre-heating technique |
| CN110527548A (en) * | 2019-09-06 | 2019-12-03 | 林永波 | A kind of delayed coking coke drum conduction oil circulation preheating device and technique |
| CN113817488A (en) * | 2021-09-26 | 2021-12-21 | 辽宁宝来生物能源有限公司 | Steam preheating system adopted in oil-based needle coke production process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130026064A1 (en) * | 2011-07-29 | 2013-01-31 | Omer Refa Koseoglu | Delayed coking process utilizing adsorbent materials |
| CN203487100U (en) * | 2013-06-26 | 2014-03-19 | 林永波 | Coke tower preheating device |
-
2014
- 2014-05-28 CN CN201410228579.7A patent/CN104232145B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130026064A1 (en) * | 2011-07-29 | 2013-01-31 | Omer Refa Koseoglu | Delayed coking process utilizing adsorbent materials |
| CN203487100U (en) * | 2013-06-26 | 2014-03-19 | 林永波 | Coke tower preheating device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104974782A (en) * | 2015-06-26 | 2015-10-14 | 林永波 | Delayed-coking coke tower outside-system heating and preheating device and technology |
| CN108102688A (en) * | 2017-12-28 | 2018-06-01 | 林永波 | A kind of delayed coking coke drum heat control technique |
| CN109722269A (en) * | 2019-01-16 | 2019-05-07 | 林永波 | A kind of delayed coking coke drum mechanical steam recompression pre-heating technique |
| CN110527548A (en) * | 2019-09-06 | 2019-12-03 | 林永波 | A kind of delayed coking coke drum conduction oil circulation preheating device and technique |
| CN113817488A (en) * | 2021-09-26 | 2021-12-21 | 辽宁宝来生物能源有限公司 | Steam preheating system adopted in oil-based needle coke production process |
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| CN104232145B (en) | 2016-03-02 |
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