CN203949474U - Be applied to the heat-exchange system that dextrin spraying dried tail gas waste heat reclaims - Google Patents
Be applied to the heat-exchange system that dextrin spraying dried tail gas waste heat reclaims Download PDFInfo
- Publication number
- CN203949474U CN203949474U CN201420178675.0U CN201420178675U CN203949474U CN 203949474 U CN203949474 U CN 203949474U CN 201420178675 U CN201420178675 U CN 201420178675U CN 203949474 U CN203949474 U CN 203949474U
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- China
- Prior art keywords
- heat exchanger
- tail gas
- side heat
- gas side
- dextrin
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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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model discloses a kind of heat-exchange system that dextrin spraying dried tail gas waste heat reclaims that is applied to, and relates to energy-saving field.Adopt a kind of secondary heat exchange technology that can On-line Control heat exchanger wall temperature, by reclaiming the contained waste heat of dried tail gas in dextrin spray drying system, in order to heat the cold air of dextrin spray drying system entrance, thereby the consumption that has reduced the initial steam that heating cold air uses, reaches energy-conservation object.In running all the time by heat exchanger wall temperature control at the above 5-10 ℃ of dextrin tail gas dew point, can utilize soot blower that the dextrin particle of partially crystallizable is blown away, thereby guarantee that heat exchanger has good heat-transfer character and lower drag characteristic all the time.System adopts water as heating agent.Unlikely too low in order to ensure circulating water temperature under unit starting process and utmost point cold season joint, system has increased tubular heat exchanger, adopts steam as standby heat source.
Description
Technical field
The utility model relates to energy-saving field, particularly a kind of heat-exchange system that is applied to the recovery of dextrin spraying dried tail gas waste heat.
Background technology
Current China northeast, there is more maltodextrin process units in the areas such as Shandong.Article 1, the production line of producing 50000 tons of maltodextrins per year has two spray drying systems, and the dried tail gas flow of every spray drying system discharge is about 100000Nm
3/ h, the about 90-100 ℃ of temperature.Because maltodextrin hygroscopicity is strong especially, up to standard in order to guarantee finished product water content, the relative humidity of tail gas must be very low, and actual measurement tail gas relative humidity is at 3-4%, and corresponding water dew point temperature is at 22-28 ℃.As can be seen here, the exhaust temperature of tail gas is far longer than its dew-point temperature, and this part tail gas is directly discharged into atmosphere, from energy-conservation angle, is a kind of huge waste of heat energy.Meanwhile, China's the Northeast's winter temperature is lower, and minimum temperature can reach-30 ℃.Like this, the temperature difference of thermal source and low-temperature receiver under extreme case up to 130 ℃.Therefore, adopt the waste heat of dextrin spraying dried tail gas, the cold air of heating spray drying system entrance, has good economy.
But because maltodextrin hygroscopicity is extremely strong, the maltodextrin after moisture absorption is very easily formed sugar, affects heat-transfer effect.Experiment shows, when the environment temperature of dextrin periphery is controlled to above 5-10 ℃ of its tail gas dew-point temperature, the dextrin depositing can moisture absorption form granular crystal, can remove in time by soot blower, thereby make the heat-transfer character of heat exchanger and drag characteristic keep good state.
Based on above principle, a kind of engineering solution is provided herein, can effectively control the lowermost wall surface temperature of heat exchanger at the above 5-10 ℃ of dextrin tail gas water dew point, guarantee the normal stable operation of residual neat recovering system.
Utility model content
A kind of heat-exchange system that is applied to the recovery of dextrin spraying dried tail gas waste heat that the utility model provides, is characterized in that, comprising:
Tail gas side heat exchanger 1, is connected between the import 11 and outlet 12 of dried tail gas;
Cold air side heat exchanger 2, is connected between inlet of cold air 21 and dextrin spray drying system entrance 22;
Described tail gas side heat exchanger water inlet 13 is connected with cold air side heat exchanger delivery port 23, and the delivery port 14 of tail gas side heat exchanger is connected with cold air side heat exchanger water inlet 24;
Tubular heat exchanger 3, is connected in parallel with described tail gas side heat exchanger;
Hygrothermograph 6, is arranged at tail gas side heat exchanger air inlet place;
Programmable logic controller (PLC) PLC5, be connected with the steam control valve on tubular heat exchanger with Hygrothermograph respectively, according to the water dew point of Hygrothermograph indication, add the surplus of 5-10 ℃, control the aperture of the upper steam control valve of tubular heat exchanger, regulate tail gas side heat exchanger water inlet water temperature to presetting range.
Described tail gas side heat exchanger and cold air side heat exchanger, by heat medium water transferring heat, realize exchange heat.
Described tail gas side heat exchanger is connected with circulating pump 7 with cold air side heat exchanger, and described heat medium water provides mobile power by circulating pump.
The means that described tubular heat exchanger regulates as circulating water temperature.
The presetting range of described tail gas side heat exchanger inlet water temperature is 5-10 ℃ on the current water dew point of tail gas of described Hygrothermograph indication.
Described tail gas side heat exchanger and cold air side heat exchanger adopt steel combined with aluminum spiral fin coil to do radiating tube.
Adopt rake soot blower, regularly blow the dextrin particle on heat exchanger tube fin off.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of heat-exchange system structured flowchart that is applied to the recovery of dextrin spraying dried tail gas waste heat that Fig. 1 provides for the utility model embodiment.
The specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model embodiment is described in further detail.
Tail gas side heat exchanger is generally arranged in exhaust fan outlet, and horizontally disposed comparatively suitable, tail gas passes through heat exchanger from top to bottom or from the bottom up.Rake soot blower is arranged in air-flow upstream, and soot-blowing mode can manually and automatically be selected, and can arrange and blow grey frequency and number of times while automatically selecting.For preventing dextrin Particle Blocking heat exchanger, the pipe of tail gas side heat exchanger row answers in-line arrangement, and tube pitch is larger.
The exhaust temperature entering before heat exchanger is different with the difference of production technology, generally at 90-105 ℃.After tail gas side heat exchanger, temperature is reduced to 60-80 ℃, and adds 10 ℃ of left and right of heating agent coolant-temperature gage heating.After mixing with the water being heated by steam through tubular heat exchanger, this part water by circulating pump and air-side heat exchanger, heats the cold air of induced-draught fan entrance.System arranges thermal resistance at the heat medium water pipe outlet of air-side heat exchanger, in order to measure the heat medium water temperature that enters tail gas side heat exchanger entrance.In order to ensure the grey effect of blowing of rake soot blower, this temperature should be controlled at the above 5-10 ℃ of tail gas dew-point temperature, i.e. 35-40 ℃.When water temperature is lower, by increasing the steam control valve aperture of tubular heat exchanger, the water temperature that enters air-side heat exchanger rises, and the water temperature of tail gas side heat exchanger also rises simultaneously, thereby makes in its scope that remains on requirement.
The effect of tubular heat exchanger mainly contain following some: 1. the initial heat while providing system to start, when system starts, exhaust temperature is lower, residual neat recovering system cannot be obtained waste heat from tail gas, in order to prevent that winter, heat medium water freezed, need to have external heat source to fill into; 2., when the lower and dust stratification of winter temperature is serious, the shortage of heat of waste heat recovery maintains the inlet water temperature of tail gas side heat exchanger more than 35 ℃ guaranteeing, for fear of serious dewfall and heat medium water, freezes risk, also needs to have external heat source to fill into.
In addition, when environment temperature is during lower than zero degree, the air quantity of flowing through due to air-side heat exchanger is very big, and air-side heat exchanger adopts efficient spiral fin coil to conduct heat, once heat medium water stops flowing, air-side heat exchanger will freeze in 1-2 minute, very risky.Therefore, this system should take into full account aspect antifreeze, has enough measures to prevent the generation of air-side heat exchanger bursting by freezing phenomenon.
Claims (8)
1. be applied to the heat-exchange system that dextrin spraying dried tail gas waste heat reclaims, comprise:
Tail gas side heat exchanger, is connected between the import of dried tail gas and the outlet of dried tail gas;
Cold air side heat exchanger, is connected between inlet of cold air and dextrin spray drying system entrance;
The water inlet of described tail gas side heat exchanger is connected with the delivery port of cold air side heat exchanger, and the delivery port of described tail gas side heat exchanger is connected with cold air side heat exchanger water inlet;
Tubular heat exchanger, one end is connected with the water inlet of described tail gas side heat exchanger, the delivery port of one end and described tail gas side heat exchanger in addition, thus be connected in parallel with described tail gas side heat exchanger;
Hygrothermograph, is arranged at tail gas side heat exchanger air inlet place;
Programmable logic controller (PLC), be connected with the steam control valve on described tubular heat exchanger with described Hygrothermograph respectively, according to the water dew point of Hygrothermograph indication, add certain surplus, control the aperture of the upper steam control valve of described tubular heat exchanger, regulate tail gas side heat exchanger water inlet water temperature to presetting range;
It is characterized in that, described surplus is 5-10 ℃, near described tail gas side heat exchanger, also has rake soot blower, regularly to blow the dextrin particle of tail gas side heat exchanger off.
2. heat-exchange system according to claim 1, is characterized in that, described tail gas side heat exchanger and cold air side heat exchanger, carry out transferring heat by heating agent, realizes exchange heat.
3. heat-exchange system according to claim 2, is characterized in that, between the water inlet of described tail gas side heat exchanger and the delivery port of cold air side heat exchanger, has circulating pump, and described circulating pump provides mobilization dynamic to described heating agent.
4. heat-exchange system according to claim 3, is characterized in that, described heating agent is water.
5. system according to claim 1, is characterized in that, the current water dew point of tail gas that described tail gas side heat exchanger inlet water temperature is made as described Hygrothermograph indication in advance adds 5-10 ℃.
6. system according to claim 1, is characterized in that, described tail gas side heat exchanger and cold air side heat exchanger adopt steel combined with aluminum spiral fin coil to do radiating tube.
7. system according to claim 1, is characterized in that, described rake soot blower is arranged on by the air-flow upstream of the tail gas of tail gas side heat exchanger.
8. system according to claim 1, is characterized in that, at the heat medium water pipe outlet of described cold air side heat exchanger, is also provided with thermal resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420178675.0U CN203949474U (en) | 2014-04-11 | 2014-04-11 | Be applied to the heat-exchange system that dextrin spraying dried tail gas waste heat reclaims |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420178675.0U CN203949474U (en) | 2014-04-11 | 2014-04-11 | Be applied to the heat-exchange system that dextrin spraying dried tail gas waste heat reclaims |
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| Publication Number | Publication Date |
|---|---|
| CN203949474U true CN203949474U (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420178675.0U Expired - Fee Related CN203949474U (en) | 2014-04-11 | 2014-04-11 | Be applied to the heat-exchange system that dextrin spraying dried tail gas waste heat reclaims |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110341417A (en) * | 2018-04-06 | 2019-10-18 | 大众汽车有限公司 | Control the method for automotive air conditioning device and the automotive air conditioning device with heat pump unit |
-
2014
- 2014-04-11 CN CN201420178675.0U patent/CN203949474U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110341417A (en) * | 2018-04-06 | 2019-10-18 | 大众汽车有限公司 | Control the method for automotive air conditioning device and the automotive air conditioning device with heat pump unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20160411 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |