CN100451503C - Defrosting pipeline for petrochemical gas heat exchanger - Google Patents
Defrosting pipeline for petrochemical gas heat exchanger Download PDFInfo
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- CN100451503C CN100451503C CNB200510048794XA CN200510048794A CN100451503C CN 100451503 C CN100451503 C CN 100451503C CN B200510048794X A CNB200510048794X A CN B200510048794XA CN 200510048794 A CN200510048794 A CN 200510048794A CN 100451503 C CN100451503 C CN 100451503C
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- heat exchanger
- gas
- defroster duct
- pipe
- heat
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a defrosting pipe of heat exchanger for petrochemical gas, used in volatile or combustible petrochemical gas. A bypassing pipe is connected with several heat exchangers in the defrosting pipe. The bypassing pipe comprises a blocking valve or multi-directional valve, and a gas disturbance device. One end of the bypassing pipe is connected with the exhaust pipe of heat exchanger where the gas is discharged finally and the other end is connected with the air inlet pipe of heat exchanger where the gas enters originally or connected with the air in-out connecting pipe of two heat exchangers. Via this, under the model of interactive defrosting in shutdown for defrosting or one side of operation and the other side of shutdown, the gas disturbance device is started to disturb the gas in heat exchanging pipe bank; heat energy generated by the disturbance is used to eliminate the frost on the surface of pipe bank so as to achieve safe and effective defrosting effect.
Description
Technical field
The present invention is a kind of defroster duct of heat exchanger, refers in particular in the field such as petrochemical industry, pollutes or the defroster duct of the heat exchanger of volatilization character gas in order to handle.It is in the fin-tube type heat exchanger in the not equality of temperature territory of at least two groups or same temperature territory, utilizes the gas of forcing to drive in the heat exchanger as gas disturbance devices such as air blasts to circulate, and reaches the defrosting effect of heat exchanger safely and effectively by this.
Background technology
When heat exchanger carries out heat exchange to particular space or predetermined substance, if the pipe of heat exchanger row surface temperature is lower than the setting temperature of material in the particular space when for example being lower than 0 ℃, can produce in the pipe of heat exchanger row surface then that general what claim be white solid matter, the thermal conductivity factor of this solid matter is because of the thermal conductivity factor far below the heat exchanger material, so can cause the heat exchanger effectiveness of heat exchanger significantly to reduce, and then cause systematic function to bring into play.
Tradition is so-called defrosting for the eliminating of frosting, and following several mode is arranged:
One, air defrosting (Air Defrost)
Claim " defrosting naturally " again, and utilization stops the supply of refrigerant and defrosts in the mode of the air circulation in the heat exchanger; It is applicable to temperature in the heat exchanger more than or equal to 2 ℃ and the refrigerant temperature environment less than 0 ℃, and must be in stopped status during operation.
Two, water defrosting (Water Defrost)
Be the most ancient Defrost mode, be and stop under refrigerant and the stopped status, utilize that the water with 15～30 ℃ spills to being defrosted in pipe row surface in water sprinkler above heat exchanger and the drain pan below the heat exchanger; It is applicable in the heat exchanger that temperature is at the environment below 0 ℃ but then must change water into non freezing solution when temperature in the heat exchanger is lower than-30 ℃.This Defrost mode is not suitable for insufficient water sources or place that can not recycling greatly because of water consumption.
Three, electric defrosting (Electric Defrost)
Be that electrothermal tube is placed between the pipe row, and stopping with the temperature of electrothermal tube the pipe of heat exchanger being got rid of frost under the state that cold coal supply promptly shuts down; It is not suitable for being used in the particular space of heat exchange or predetermined substance for having burning or explosive as oil gas or petrochemical industry gas.
Above-mentioned Defrost mode respectively has its pluses and minuses, if but heat exchanger is applied to the recycling of petrochemical industry oil gas, can only adopt two kinds of air defrosting and water defrostings in that the prerequisite of safety is next, wherein water defrosting need expend a large amount of water, is not suitable for for the island country of insufficient water sources; But the defrosting speed of conventional air defrosting is slow; And strange environment for use be in the heat exchanger temperature more than or equal to 2 ℃ and refrigerant temperature less than 0 ℃, must be under the situation that could liquefy fully about-30 ℃ for oil gas, this Defrost mode obviously can't directly be used by the heat exchanger in this field.
Summary of the invention
Main purpose of the present invention provides a kind of defroster duct of heat exchanger, and especially this heat exchanger is to use in tool volatility or flammable petrochemical industry gas, by this can under the environment of safety, carry out this heat exchanger defrosting.
According to the defroster duct of the heat exchanger of above-mentioned purpose, be to establish a bypass pipe road, installing one blocked valve and a gas disturbance device on it; The blast pipe of the last heat exchanger of discharging of one end of this bypass line and gas links to each other, and the other end is connected on the connecting line of the air inlet pipe of the heat exchanger that gas initially enters or two heat-exchanger intake and exhaust.
Defroster duct as above-mentioned heat exchanger has two kinds of defrosting modes; wherein: shutting down defrosting mode; the stop supplies refrigerant is opened blocked valve and is started the gas disturbance device, allows heat exchanger tube arrange interior air agitation, removes the frosting on pipe row surface by the heat energy that this disturbance produced.Can't from the intake and exhaust pipeline of heat exchanger be discharged by the air-flow of disturbance this moment, on the contrary can be because of the pipeline inner pressure balance continue in inner loop, so just can temperature and time control the time of defrosting.Another kind is the mutual defrosting mode that can't shut down; In the middle of system needs the above long-time continuous running of twenty four hours, can't shut down when defrosting, promptly need build and put two group heat exchangers with the defrosting operation in using; Its way is to connect a bypass pipe road between two groups of heat exchangers, establish two four-way change-over valves and a gas disturbance device on the bypass line, when wherein one group carry out steam (oil gas) when cooling, close four-way change-over valve and lead to the path of steam cooling group, and start the gas disturbance device, allow the disturbance that circulates of pipe row inner air of another group heat exchanger; At this moment, because of the line isolation of four-way change-over valve with two groups of heat exchangers, so, steam and inner circulating air do not disturb mutually mix under, and can carry out operation in one group separately.After one group defrosting operation is finished,, make not defrosting group defrosting defrosting group carry out the cooling of steam again via switching two four-way change-over valves to other direction.
As above-mentioned Defrost mode, the accumulation of heat liquid that in heat exchanger, imports still all right, the heat by accumulation of heat liquid transfers to inner circulating air, thereby quickens the speed of defrosting.
Structural feature of the present invention and effect thereof are clearer to be presented in order to make, and lifts preferred embodiment now and cooperates graphic being described in detail as follows:
Description of drawings
Fig. 1 is the pipeline structure figure that the defroster duct of heat exchanger of the present invention is suitable for shutting down defrosting;
Figure 1A is to use in the pipeline structure figure of tool volatility or flammable petrochemical industry gas; Figure 1B is the defroster duct of the heat exchanger of other preferable enforcement structure of the present invention;
Fig. 2 is the pipeline structure figure that the defroster duct of heat exchanger of the present invention is suitable for mutual defrosting;
Fig. 2 A need build to put two group heat exchangers to carry out mutual defrosting mode, the wherein preferable enforcement pipeline under this pattern;
Fig. 2 B is the mutual defroster duct of the heat exchanger of other preferable enforcement structure of the present invention.
[primary clustering symbol description]
1,1 ', 3 bypass lines
12 blocked valves
14,34 gas disturbance devices
16 import end
18,18 ' output
21,41,51,61 first heat exchangers
22,42,44,52,62 second heat exchangers
23,43,45,53,63 the 3rd heat exchangers
211,421,441,511,611 air inlet pipe
231,411,431,451,461,531,631 blast pipes
241,243 air inlet-outlet pipes
320,322 four-way change-over valves
70 pending steams
Steam after 72 processing
82 accumulation of heat liquid advance
84 accumulation of heat liquid go out
The specific embodiment
The defroster duct of the heat exchanger of the preferable enforcement structure of the present invention is to use in tool volatility or flammable petrochemical industry gas; Shown in Figure 1A of Fig. 1, this defroster duct comprises a bypass pipe road 1, has a blocked valve 12 and a gas disturbance device 14 on it; The importing end 16 of this bypass line 1 links to each other with the blast pipe 231 of the 3rd heat exchanger 23, and output 18 is connected on the air inlet-outlet pipe 241 between first heat exchanger 21 and second heat exchanger 22; In addition, be connected an air inlet-outlet pipe 243 between second heat exchanger 22 and the 3rd heat exchanger 23, and pending steam or oil gas import through the air inlet pipe 211 of first heat exchanger 21.
Defroster duct as above-mentioned heat exchanger; be to be applied to shut down defrosting mode; promptly stopping to import steam and the supply refrigerant is gone under the situation of each heat exchanger; blocked valve 12 is opened and startup gas disturbance device 14; allow the air-flow (as dotted arrow among the figure) of disturbance by the output 18 of bypass line 1 via first heat exchanger 21; air inlet-outlet pipe 241 between second heat exchanger 22 and the 3rd heat exchanger 23; 243 enter in second heat exchanger 22 and the 3rd heat exchanger 23; make the air agitation among the pipe row of this two heat exchangers, remove the frosting on pipe row surface by the heat energy that this disturbance produced.Above-mentionedly can't be discharged from the air inlet and exhaust piper 211,231 of heat exchanger, can so just can utilize temperature and time to control the time of defrosting because of the pipeline inner pressure balance continues in inner loop on the contrary by the air-flow of disturbance.
Defroster duct in Figure 1A is to use the recycling in oil gas, and according to its treatment characteristic, the processing temperature of first heat exchanger 21 is at about-3 ℃ Celsius, so its chance that produces frosting is little, therefore bypass line 1 is not connected on the air inlet pipe 211; But consider the demand of other operation, the defroster duct of the heat exchanger of other preferable enforcement structure of the present invention, shown in Figure 1B of Fig. 1, the output 18 ' of its bypass line 1 ' is to be connected on the air inlet pipe 211 of first heat exchanger 21, make the rough air (as dotted arrow among the figure) that produces via gas disturbance device 14, can enter first heat exchanger 21 and its inner tube row is defrosted.
As the defroster duct of the heat exchanger of above-mentioned preferable enforcement structure, be to be applied to shut down defrosting mode.But in the middle of system needs the above long-time continuous running of twenty four hours, can't shut down when defrosting, promptly need build and put two group heat exchangers to carry out mutual defrosting mode, wherein preferable enforcement pipeline under this pattern is shown in Fig. 2 A, comprise that a bypass pipe road 3 is located between two groups of heat exchangers 42,43 and 44,45, have two four-way change-over valves 320,322 and a gas disturbance device 34 on it; Wherein a four-way change-over valve 320 links to each other with the blast pipe 431,451 of the 3rd heat exchanger 43,45, and 322 of another four-way change-over valves link to each other with the air inlet pipe 421,441 of second heat exchanger 42,44; The blast pipe 411 of first heat exchanger 41 is connected to four-way change-over valve 322, and four-way change-over valve 320 connects a blast pipe 461.
As above-mentioned mutual defroster duct, before wherein one group of heat exchanger 42,43 carries out steam or oil gas (as Fig. 2 A dotted line) cooling, see through two four-way change-over valves 320,322 and close, form the closing pipe line of another group heat exchanger 44,45 simultaneously towards the path of steam cooling group; Start gas disturbance device 34 this moment, makes heat exchanger 44,45 pipe row inner airs produce circulation disturbance (as Fig. 2 A dotted line).Because four-way change-over valve 320,322 line isolation with two groups of heat exchangers, so, the steam that is entered by first heat exchanger 41 can directly enter in the heat exchanger 42,43 of cooling operations, does not mix and can not interfere with each other with another heat exchanger 44,45 that carries out inner circulating air disturbance defrosting.In this case, the steam after the cooling processing can be by blast pipe 431, four-way change-over valve 320 outside blast pipe 461 discharge systems; And the disturbance air in another group, then continue circulation defrosting in heat exchanger 44,45 by control by two four-way change-over valves 320,322, after the defrosting operation of this group is finished, switch to other direction via two four-way change-over valves 320,322 again, make not defrosting group defrosting defrosting group carry out the cooling of steam.
Defroster duct in Fig. 2 of Fig. 2 A is not include first heat exchanger 41 in the defrosting scope; Only consider the demand of other operation, the mutual defroster duct of the heat exchanger of other preferable enforcement structure of the present invention is shown in Fig. 2 B of Fig. 2, its bypass line 3 still is located between two groups of heat exchangers, but these two groups of heat exchangers respectively comprise first heat exchanger 51,61, second heat exchanger 52,62 and the 3rd heat exchanger 53,63; And two four-way change-over valves 320,322 link to each other with the blast pipe 531,631 of the 3rd heat exchanger 53,63 respectively; 322 of another four-way change-over valves link to each other with the air inlet pipe 511,611 of first heat exchanger 51,61; Pending steam 70 is entered by four-way change-over valve 322, and the steam 72 after the processing is discharged by four-way change-over valve 320.As the defroster duct among Fig. 2 B, first heat exchanger 51, second heat exchanger 52 and the 3rd heat exchanger 53 are to carry out steam cooling (as Fig. 2 B dotted line); First heat exchanger 61, second heat exchanger 62 and the 3rd heat exchanger 63 then defrost (as Fig. 2 B dotted line).
As above-mentioned Defrost mode, the accumulation of heat liquid that imports in heat exchanger still all right transfers to the defrost air of interior circulation by accumulation of heat liquid heat, thereby quickens the speed of defrosting.This accumulation of heat liquid is the heat exchanger that only is incorporated in the initial in-position of defrost gas, second heat exchanger 22 shown in Figure 1A; First heat exchanger 21 of Figure 1B; Second heat exchanger 42 of Fig. 2 A or 44 and first heat exchanger 51 or 61 of Fig. 2 B can be circulated in these heat exchangers into and out of 82,84 by accumulation of heat liquid, and reach the effect that heat is transferred to this recyclegas.
The present invention such as above-mentioned defroster duct are when heat exchanger carries out heat exchange process, by avoiding by closing blocked valve that pending steam is untreated promptly discharges and contaminated environment from this bypass line.
The present invention such as above-mentioned defroster duct, wherein the group number of heat exchanger does not exceed with the revealer of the foregoing description institute, the material that visual institute desire is handled and additions and deletions, but comprise two groups heat exchanger in principle at least.
The present invention such as above-mentioned defroster duct, wherein the gas disturbance device on the bypass line can be devices such as a kind of air blast or fan with its functional direction.
In sum, the defroster duct of the heat exchanger of petrifaction gas provided by the present invention more can provide effective and safe defrosting effect than the Defrost mode of prior art, is particularly suitable for tool volatility or flammable petrochemical industry gas and uses.
Though preferred embodiment of the present invention has cooperated graphic explanation as above, but structural feature of the present invention is not limited thereto, anyly be familiar with this skill person on the technical foundation that the present invention discloses as described above, can think easily and the derived structure that variation or modification became, the claim that all should be this case contains.
Claims (14)
1. the defroster duct of the heat exchanger of a petrifaction gas is characterized in that described defroster duct establishes a bypass line that is connected with several heat exchangers, and this bypass line comprises:
One blocked valve, its output is connected in the heat exchanger that a gas initially enters;
One air blast/fan, it is as the gas disturbance device and its importing end is connected with the last heat exchanger of discharging of gas, and its output is connected in this blocked valve.
2. defroster duct as claimed in claim 1, the output that it is characterized in that this blocked valve links to each other with the air inlet pipe of the heat exchanger that gas initially enters.
3. defroster duct as claimed in claim 1, the air inlet pipe of the escape pipe of the heat exchanger that the output that it is characterized in that this blocked valve and gas initially enter and the heat exchanger of time one-level links to each other, and wherein the escape pipe of the heat exchanger that initially enters of gas is interconnected with the air inlet pipe of the heat exchanger of inferior one-level.
4. defroster duct as claimed in claim 1 is characterized in that the importing end of this air blast/fan is connected with the blast pipe of the last heat exchanger of discharging of gas.
5. defroster duct as claimed in claim 1 is characterized in that described defroster duct comprises two heat exchangers at least.
6. defroster duct as claimed in claim 1 is characterized in that adding accumulation of heat liquid in the heat exchanger of operation that defrosts.
7. defroster duct as claimed in claim 6 is characterized in that this accumulation of heat liquid is only to be incorporated in the heat exchanger that its air inlet pipe is connected with the output of blocked valve or four-way change-over valve.
8. the defroster duct of the heat exchanger of a petrifaction gas is characterized in that described defroster duct establishes a bypass line that is connected with several heat exchangers, and this bypass line comprises:
A pair of four-way change-over valve, wherein a four-way change-over valve is connected in the heat exchanger that a gas initially enters, and another four-way change-over valve links to each other with the last heat exchanger of discharging of gas;
One air blast/fan, it is located between the aforementioned a pair of four-way change-over valve as the gas disturbance device.
9. defroster duct as claimed in claim 8 it is characterized in that described defroster duct comprises two groups of heat exchangers, and every group comprises two heat exchangers at least.
10. defroster duct as claimed in claim 9 is characterized in that one of them of this a pair of four-way change-over valve, and its blast pipe that imports the heat exchanger that end and gas initially enters links to each other.
11. defroster duct as claimed in claim 9 is characterized in that one of them of this a pair of four-way change-over valve, wherein two ends link to each other with the discharge pipe of the last heat exchanger of discharging of gas, and the other end is the gas outlet side.
12. defroster duct as claimed in claim 9 is characterized in that one of them of this a pair of four-way change-over valve, its air inlet pipe that derives the heat exchanger that end and gas initially enters links to each other.
13. defroster duct as claimed in claim 8 is characterized in that adding accumulation of heat liquid in the heat exchanger of operation that defrosts.
14. defroster duct as claimed in claim 13 is characterized in that this accumulation of heat liquid is only to be incorporated in the heat exchanger that its air inlet pipe is connected with the output of blocked valve or four-way change-over valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510048794XA CN100451503C (en) | 2005-12-29 | 2005-12-29 | Defrosting pipeline for petrochemical gas heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510048794XA CN100451503C (en) | 2005-12-29 | 2005-12-29 | Defrosting pipeline for petrochemical gas heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1995878A CN1995878A (en) | 2007-07-11 |
| CN100451503C true CN100451503C (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510048794XA Expired - Fee Related CN100451503C (en) | 2005-12-29 | 2005-12-29 | Defrosting pipeline for petrochemical gas heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100451503C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524849A (en) * | 2019-09-18 | 2021-03-19 | 瑞弘冷冻科技股份有限公司 | Heat exchange system and defrosting method thereof without hand heat supply source and capable of recycling waste cold |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0252300A (en) * | 1988-08-17 | 1990-02-21 | Toshiba Corp | Radioactive gas waste matters processor |
| CN2546821Y (en) * | 2002-05-13 | 2003-04-23 | 王德元 | Thermal pump type air conditioner set with automatic removing frost device |
| EP1498673A1 (en) * | 2003-07-18 | 2005-01-19 | Linde Kältetechnik GmbH & Co.KG | Hot gas defrost system for refrigeration systems |
| CN1683850A (en) * | 2004-04-14 | 2005-10-19 | 河南新飞电器有限公司 | Air source heat pump for high humidity area |
-
2005
- 2005-12-29 CN CNB200510048794XA patent/CN100451503C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0252300A (en) * | 1988-08-17 | 1990-02-21 | Toshiba Corp | Radioactive gas waste matters processor |
| CN2546821Y (en) * | 2002-05-13 | 2003-04-23 | 王德元 | Thermal pump type air conditioner set with automatic removing frost device |
| EP1498673A1 (en) * | 2003-07-18 | 2005-01-19 | Linde Kältetechnik GmbH & Co.KG | Hot gas defrost system for refrigeration systems |
| CN1683850A (en) * | 2004-04-14 | 2005-10-19 | 河南新飞电器有限公司 | Air source heat pump for high humidity area |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1995878A (en) | 2007-07-11 |
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