CN103063061A - Heat exchange method and device for bulk materials - Google Patents
Heat exchange method and device for bulk materials Download PDFInfo
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- CN103063061A CN103063061A CN2013100277734A CN201310027773A CN103063061A CN 103063061 A CN103063061 A CN 103063061A CN 2013100277734 A CN2013100277734 A CN 2013100277734A CN 201310027773 A CN201310027773 A CN 201310027773A CN 103063061 A CN103063061 A CN 103063061A
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- bulk cargo
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Abstract
The invention discloses a heat exchange method and a device for bulk materials, and belongs to the technical field of waste heat utilization and heat exchange. The heat exchange device comprises an insulation shell, a bulk inlet, a bulk outlet, a heat exchange bundle, a heat exchange working medium inlet, a heat exchange working medium outlet and a rotary discharging mechanism capable of controlling feeding speed. When the temperature of the bulk inlet, the average particle size of the bulk materials and the temperature of the heat exchange working medium inlet and outlet are under certain temperature, the temperature of the bulk outlet can be directly controlled by controlling mass flow of the bulk materials. Since the heat exchange bundle and the rotary discharging mechanism are installed, stagnation and blockage of the bulk materials can be effectively avoided. The heat exchange method and device can be widely applied in heating, drying or cooling of bulk materials in industries of chemical, steel, food and the like.
Description
Technical field
The present invention relates to a kind of heat-exchange method and device of bulk cargo, belong to UTILIZATION OF VESIDUAL HEAT IN and heat transfer technology field, can be widely used in the industries such as chemical industry, iron and steel, grain processing.
Background technology
The heat transfer problem of bulk cargo extensively is present in a lot of industries.At field of industrial productions such as chemical industry, iron and steel, the waste heat amounts such as solid product and waste residue are very high, if do not carry out waste heat recovery, waste is apparent; Equally in these fields.Sometimes then need a large amount of bulk cargos are carried out the pre-heat treatment.Similarly, in the process to the processing of grain and storage, need to carry out drying or cooling processing to grain.Above-mentioned problem can be summed up as the heat transfer problem of bulk cargo, at present for a large amount of bulk cargos, mainly adopts the method for direct heat transfer or indirect heat exchange.
Direct heat transfer is to be cooled to example, mostly adopt air cooling way, namely with gas as cooling medium, by air blast refrigerating gas and solid granule are directly contacted and carry out heat exchange, its gas-solid can fully contact, and heat exchange area is large, thereby the high temperature sensible heat of recovered material preferably, the higher heat recovery method of a kind of efficient, but to some materials that can react with some composition in the air and thin powder, then inapplicable.In addition, behind the gas-solid direct contact heat transfer, can contain a large amount of impurity in the gas of discharge, be not suitable for direct utilization.
Although indirect heat exchange can obtain clean heat transferring medium, because the equipment specific area is little, heat transfer effect is bad, if increase the surface area of heat exchange by installing finned tube additional, for bulk cargo, then can bring the bulk cargo problem such as block.Simultaneously, existing bulk cargo heat-exchanger rig is difficult to realize the quantitative control to the outlet temperature of bulk cargo, often can only determine operational factor by experience, satisfies the outlet temperature requirement of bulk cargo.
Summary of the invention
For the problem that above-mentioned existing bulk cargo heat-exchanger rig exists, the present invention proposes a kind of heat-exchange method and device of bulk cargo.
The technical solution adopted in the present invention is:
A kind of heat-exchange method of bulk cargo is characterized in that:
1) bulk cargo is entered from the top of heat-exchanger rig, be furnished with heat-exchanging tube bundle in this heat-exchanger rig, pass into heat-exchange working medium in the tube bank, make and carry out heat exchange between bulk cargo and the working medium;
When the temperature of 2) importing and exporting when the inlet temperature of bulk cargo, bulk cargo average grain diameter and heat-exchange working medium is determined, control the temperature of exit bulk cargo by the mass flow of control exit bulk cargo, the outlet temperature of bulk cargo represents with following formula:
Wherein, Q
M, pBe the mass flow of bulk cargo, unit is kg/s; C
P, pBe the specific heat capacity of bulk cargo, the J/kg-K of unit; T
P, inBe the inlet temperature of bulk cargo, unit is K; T
P, outBe the outlet temperature of bulk cargo, unit is K; h
WpBe the average heat transfer coefficient of bulk cargo and heat-exchanging tube bundle, unit is W/m
2-K; A is effective heat exchange area, and unit is m
2T
F, inBe the inlet temperature of working medium, unit is K; T
F, outBe the outlet temperature of working medium, unit is K.
The average grain diameter of bulk cargo of the present invention is 1～100mm, and heat-exchange working medium adopts water or steam.
The present invention also provides a kind of heat-exchanger rig of bulk cargo, it is characterized in that: this device comprises insulation shell, bulk cargo import, bulk cargo outlet, heat-exchanging tube bundle, heat-exchange working medium import and heat-exchange working medium outlet, and described heat-exchanging tube bundle is arranged in the insulation shell; Described bulk cargo import and bulk cargo outlet are separately positioned on top and the bottom of insulation shell, some rotation discharging mechanisms have been arranged in juxtaposition in the bulk cargo exit of insulation shell lower end, each rotates discharging mechanism and contains turning cylinder and the fin that is evenly arranged on the turning cylinder, and the fin of adjacent rotated discharging mechanism is staggered in arrangement.
The technical characterictic of device of the present invention also is: the tube pitch s in the heat-exchanging tube bundle is greater than 3～5 times of the bulk cargo average grain diameter; Be furnished with the level monitoring device in the space between bulk cargo import and heat-exchanging tube bundle; 4～10 fins have been evenly arranged on the turning cylinder.
The present invention compared with prior art has the following advantages and the high-lighting effect: the present invention is owing to adopt above-mentioned technical scheme, control the flow of exit bulk cargo by the velocity of rotation of control rotation discharging mechanism, under the condition of bulk cargo inlet temperature, heat-exchange working medium out temperature, only the flow with bulk cargo is relevant for the temperature of bulk cargo outlet, just can realize exporting the quantitative control of bulk cargo temperature by the control rate of discharge easily.Simultaneously, heat-exchanging tube bundle is furnished with to be beneficial to and avoids bulk cargo the phenomenon that blocks to occur.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the schematic diagram that rotates when being evenly arranged 8 fins on the turning cylinder of discharging mechanism and rotating.
Fig. 3 is the A-A ' cutaway view of Fig. 1.
Among the figure: the import of 1-bulk cargo; 2-level monitoring device; The import of 3-heat-exchange working medium; The 4-heat-exchanging tube bundle; The 5-insulation shell; The outlet of 6-heat-exchange working medium; 7-rotates discharging mechanism; The outlet of 8-bulk cargo; The 9-turning cylinder; The 10-fin.
The specific embodiment
Below in conjunction with accompanying drawing structure of the present invention, mechanism and the course of work are further described:
Fig. 1 is structural representation of the present invention.This device comprises insulation shell 5, bulk cargo import 1, bulk cargo outlet 8, heat-exchanging tube bundle 4, heat-exchange working medium import 3 and heat-exchange working medium outlet 6, and described heat-exchanging tube bundle 4 is arranged in the insulation shell 5; Described bulk cargo import 1 and bulk cargo outlet 8 are separately positioned on top and the bottom of insulation shell, some rotation discharging mechanisms 7 (as shown in Figure 3) have been arranged in juxtaposition in the bulk cargo exit of insulation shell lower end, each rotates discharging mechanism 7 and contains turning cylinder 9 and the fin 10 that is evenly arranged on the turning cylinder, and the fin of adjacent rotated discharging mechanism is staggered in arrangement.
The below is analyzed the heat transfer process of solid material in device, if suppose that horizontal heat exchange is even, heat-exchanger rig is divided into several micro units at vertical direction, in each micro unit, following relation is arranged:
Q
m,pC
p,p(T
p,out,i-T
p,in,i)=h
wp,iA
i(T
w,i-T
p,i)
Wherein, Q
M, pBe the mass flow of bulk cargo, unit is kg/s; C
P, pBe the specific heat capacity of bulk cargo, unit is J/kg-K; T
P, in, iBe the temperature that bulk cargo enters micro unit, unit is K; T
P, out, iFor bulk cargo leaves the temperature of micro unit, unit is K; h
Wp, iBe the average heat transfer coefficient of bulk cargo in the micro unit and heat exchanger tube, unit is W/m
2-K; A
iBe the effective heat exchange area in the micro unit, unit is m
2T
W, iBe the Average heat transfer tube wall temperature in the micro unit, unit is K; T
P, iBe the average bulk cargo temperature in the micro unit, unit is K.Because the movement velocity of bulk cargo is relatively slow in the device, so the heat exchange mechanism of bulk cargo and wall is mainly heat conduction, the coefficient of heat transfer and bulk cargo temperature, and the intrinsic properties such as the average grain diameter of bulk cargo are relevant, can be definite uniquely according to concrete operating mode, so work as T
P, in, iOne regularly, can obtain:
T
p,out,i=f(Q
m,p,T
w,i)
If above-mentioned thermal balance type is vertically carried out integration, namely
∫
HQ
m,pC
p,p(T
p,out,i-T
p,in,i)=∫
Hh
wp,iA
i(T
w,i-T
p,i)
According to following formula, when the temperature of importing and exporting when the inlet temperature of bulk cargo, bulk cargo average grain diameter and heat-exchange working medium was determined, the outlet temperature of bulk cargo can be expressed as:
Wherein, T
P, inBe the inlet temperature of bulk cargo, unit is K; T
P, outBe the outlet temperature of bulk cargo, unit is K; h
WpBe the average heat transfer coefficient of bulk cargo and heat-exchanging tube bundle, unit is W/m
2-K; A is effective heat exchange area, and unit is m
2T
F, inBe the inlet temperature of working medium, unit is K; T
F, outBe the outlet temperature of working medium, unit is K.Inlet temperature, average grain diameter, the out temperature of heat-exchange working medium and the outlet temperature of bulk cargo according to bulk cargo, can be by experiment or existing heat transfer data obtain the average heat transfer coefficient of bulk cargo and heat-exchanging tube bundle, therefore the outlet temperature of bulk cargo is only relevant with the mass flow of bulk cargo in the following formula, be that the bulk cargo outlet temperature is the one-variable function of bulk cargo mass flow, therefore when practical operation, as long as the mass flow of bulk cargo is certain, then the bulk cargo temperature in exit is determined, also namely can control outlet temperature by the mass flow of control bulk cargo.
The prerequisite of above-mentioned relation formula is, bulk cargo need to flow in the inner maintenance of device, therefore the present invention has adopted following measures to guarantee the mobile unimpeded of bulk cargo: at first, the level monitoring device 2 that is arranged on upper area can temporary close bulk cargo import 1 when the inner bulk cargo overheap of heat-exchanger rig, cuts off the bulk cargo source; Secondly, stop up between heat-exchanging tube bundle in order to prevent bulk cargo, guarantee that the heat-exchanging tube bundle distance s is at least greater than 3～5 times of bulk cargo average grain diameter; At last, be arranged in juxtaposition several in the exit and rotated discharging mechanism 7, controlled the bulk cargo mass flow of outlet by rotating discharging mechanism, rotated discharging mechanism 7 at each and be evenly arranged some fins, be preferably 4～10 fins, the fin of adjacent rotated discharging mechanism is staggered in arrangement.
Fig. 2 is the schematic diagram that rotates when being evenly arranged 8 fins on the turning cylinder of discharging mechanism and rotating, when all turning cylinders rotate synchronously, and phase phasic difference 22.5 degree, this staggered is arranged and can be prevented from getting stuck between discharging mechanism.
This device is the bulk cargo heat-exchanger rig, is applicable to the bulk cargo that average grain diameter is 1～100mm, can be according to heating, drying or the cooling device of different needs as bulk cargo.If be used for heating or dry bulk cargo, heat-exchange working medium can adopt hot water or steam; If be used for cooling of bulk products, heat-exchange working medium can adopt cold water.
Claims (6)
1. the heat-exchange method of a bulk cargo is characterized in that the method comprises the steps:
1) bulk cargo is entered from the top of heat-exchanger rig, be furnished with heat-exchanging tube bundle in this heat-exchanger rig, pass into heat-exchange working medium in the tube bank, make and carry out heat exchange between bulk cargo and the working medium;
When the temperature of 2) importing and exporting when the inlet temperature of bulk cargo, bulk cargo average grain diameter and heat-exchange working medium is determined, control the temperature of exit bulk cargo by the mass flow of control exit bulk cargo, the outlet temperature of bulk cargo represents with following formula:
Wherein, Q
M, pBe the mass flow of bulk cargo, unit is kg/s; C
P, pBe the specific heat capacity of bulk cargo, unit is J/kg-K; T
P, inBe the inlet temperature of bulk cargo, unit is K; T
P, outBe the outlet temperature of bulk cargo, unit is K; h
WpBe the average heat transfer coefficient of bulk cargo and heat-exchanging tube bundle, unit is W/m
2-K; A is effective heat exchange area, and unit is m
2T
F, inBe the inlet temperature of working medium, unit is K; T
F, outBe the outlet temperature of working medium, unit is K.
2. according to the heat-exchange method of a kind of bulk cargo claimed in claim 1, be further characterized in that: the average grain diameter of described bulk cargo is 1～100mm, and heat-exchange working medium adopts water or steam.
3. realize the as claimed in claim 1 or 2 heat-exchanger rig of a kind of bulk cargo of method, it is characterized in that: this device comprises insulation shell (5), bulk cargo import (1), bulk cargo outlet (8), heat-exchanging tube bundle (4), heat-exchange working medium import (3) and heat-exchange working medium outlet (6), and described heat-exchanging tube bundle (4) is arranged in the insulation shell (5); Described bulk cargo import (1) and bulk cargo outlet (8) are separately positioned on top and the bottom of insulation shell, some rotation discharging mechanisms (7) have been arranged in juxtaposition in the bulk cargo exit of insulation shell lower end, each rotates discharging mechanism (7) and contains turning cylinder (9) and be evenly arranged in fin (10) on the turning cylinder, and the fins of adjacent two rotation discharging mechanisms are staggered in arrangement.
4. according to the heat-exchanger rig of a kind of bulk cargo claimed in claim 3, it is characterized in that: the tube pitch s in the heat-exchanging tube bundle is greater than 3～5 times of the bulk cargo average grain diameter.
5. according to the heat-exchanger rig of a kind of bulk cargo claimed in claim 3, it is characterized in that: be furnished with level monitoring device (2) in the space between bulk cargo import (1) and heat-exchanging tube bundle (4).
6. according to the heat-exchanger rig of a kind of bulk cargo claimed in claim 3, it is characterized in that: be evenly arranged 4～10 fins on the described turning cylinder (9).
Priority Applications (1)
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|---|---|---|---|
| CN2013100277734A CN103063061A (en) | 2013-01-24 | 2013-01-24 | Heat exchange method and device for bulk materials |
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|---|---|---|---|
| CN2013100277734A CN103063061A (en) | 2013-01-24 | 2013-01-24 | Heat exchange method and device for bulk materials |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562187A (en) * | 2018-04-03 | 2018-09-21 | 北京科技大学 | A kind of interior method and device removed accumulation, put up a bridge of high-temperature solid bulk cargo heat exchanger |
| CN108662923A (en) * | 2018-04-16 | 2018-10-16 | 北京科技大学 | A kind of device for the effective waste heat recovery of high temperature wide-size distribution grain size bulk cargo |
| CN109029041A (en) * | 2018-06-04 | 2018-12-18 | 北京科技大学 | A kind of device of high temperature bulk material heat exchanger steady and continuous discharge |
| CN110927205A (en) * | 2019-11-26 | 2020-03-27 | 北京科技大学 | Device for measuring heat exchange coefficient of bulk material flowing around pipe |
| CN110926243A (en) * | 2019-11-28 | 2020-03-27 | 北京科技大学 | Particle blending-based indirect heat transfer strengthening method for high-temperature solid bulk materials |
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| JP2006194524A (en) * | 2005-01-14 | 2006-07-27 | Kubota Corp | Total heat exchanger and air conditioner |
| CN201081563Y (en) * | 2007-09-07 | 2008-07-02 | 山东天力干燥设备有限公司 | Cooler with built-in buried tube heat exchanger |
| CN201825572U (en) * | 2010-09-27 | 2011-05-11 | 广州市容川饲料有限公司 | Impeller type continuous discharge device of counterflow type cooler |
| CN202403569U (en) * | 2011-12-28 | 2012-08-29 | 北京广厦环能科技有限公司 | Powder cooler |
-
2013
- 2013-01-24 CN CN2013100277734A patent/CN103063061A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006194524A (en) * | 2005-01-14 | 2006-07-27 | Kubota Corp | Total heat exchanger and air conditioner |
| CN201081563Y (en) * | 2007-09-07 | 2008-07-02 | 山东天力干燥设备有限公司 | Cooler with built-in buried tube heat exchanger |
| CN201825572U (en) * | 2010-09-27 | 2011-05-11 | 广州市容川饲料有限公司 | Impeller type continuous discharge device of counterflow type cooler |
| CN202403569U (en) * | 2011-12-28 | 2012-08-29 | 北京广厦环能科技有限公司 | Powder cooler |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562187A (en) * | 2018-04-03 | 2018-09-21 | 北京科技大学 | A kind of interior method and device removed accumulation, put up a bridge of high-temperature solid bulk cargo heat exchanger |
| CN108562187B (en) * | 2018-04-03 | 2019-10-18 | 北京科技大学 | A kind of interior method and device removing accumulation, putting up a bridge of high-temperature solid bulk cargo heat exchanger |
| CN108662923A (en) * | 2018-04-16 | 2018-10-16 | 北京科技大学 | A kind of device for the effective waste heat recovery of high temperature wide-size distribution grain size bulk cargo |
| CN109029041A (en) * | 2018-06-04 | 2018-12-18 | 北京科技大学 | A kind of device of high temperature bulk material heat exchanger steady and continuous discharge |
| CN110927205A (en) * | 2019-11-26 | 2020-03-27 | 北京科技大学 | Device for measuring heat exchange coefficient of bulk material flowing around pipe |
| CN110926243A (en) * | 2019-11-28 | 2020-03-27 | 北京科技大学 | Particle blending-based indirect heat transfer strengthening method for high-temperature solid bulk materials |
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Application publication date: 20130424 |