CN210154352U - High-temperature slag waste heat utilization system of counter-flow star-shaped roller heat exchanger - Google Patents
High-temperature slag waste heat utilization system of counter-flow star-shaped roller heat exchanger Download PDFInfo
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- CN210154352U CN210154352U CN201920783922.2U CN201920783922U CN210154352U CN 210154352 U CN210154352 U CN 210154352U CN 201920783922 U CN201920783922 U CN 201920783922U CN 210154352 U CN210154352 U CN 210154352U
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Abstract
The utility model discloses a counter-flow star roller heat exchanger high temperature sediment waste heat utilization system, this system include high temperature sediment storehouse, star roll-type heat transfer system, cold sediment processing system and working medium circulation system, set up the feed cinder notch below the high temperature sediment storehouse, the feed cinder notch is connected star roll-type heat transfer system, star roll-type heat transfer system includes the star roll-type heat exchanger of many mutual series connections, last one the slag notch of star roll-type heat exchanger is connected cold sediment processing system, the heat transfer working medium of star roll-type heat exchanger connects working medium circulation system; the system has high heat conductivity coefficient of the high-temperature slag and high heat exchange speed, can recover sensible heat carried by the powdery high-temperature waste slag, can improve the energy utilization efficiency, and can reduce heat pollution.
Description
Technical Field
The utility model relates to a counter-flow star roller heat exchanger high temperature sediment waste heat utilization system belongs to chemical industry waste heat utilization technical field.
Background
High-temperature slag, reducing slag and the like discharged by the metallurgy and energy industries such as thermal power plant boilers, iron-making blast furnaces, silicothermic reduction of metal magnesium, aluminothermic reduction of metal calcium and the like have the highest temperature of 1600 ℃, carry a large amount of sensible heat, and cause extreme waste of energy if the waste heat is not recycled or is not properly recycled. Taking the silicothermic reduction of magnesium metal as an example, for every 1 ton of magnesium metal produced, about 5.5 tons of reduced magnesium slag are produced, leaving the reduction tank at a temperature of about 1200 ℃. According to the calculation of professor Chengjinqing of Jiangxi Ringchang university, the specific heat capacity of the reduced magnesium slag is about 871J/kg at the temperature range of 1200-25 ℃, namely, the reduced magnesium slag generated by producing 1 ton of metal magnesium is cooled from 1200 ℃ to 25 ℃, and the released sensible heat is equivalent to the heat released by burning about 192.5kg of standard coal. The annual yield of magnesium smelting by a silicothermic method in China is calculated according to 90 ten thousand tons at present, the utilization rate of the waste heat of the reduced magnesium slag is calculated according to 60%, the recovered waste heat is equivalent to the heat released by burning about 10.5 ten thousand tons of standard coal, and meanwhile, the emission of harmful substances such as carbon dioxide, sulfur dioxide, dust and the like is reduced, so that the method has great economic value and great social and environmental protection values.
At present, in the industry, for the treatment of the reduced magnesium slag, one is to utilize cooling water to spray and cool the hot reduced magnesium slag through a slag cooler and generate a small amount of hot water and steam at the same time. The slag cooler has the disadvantages that the slag cooler belongs to a semi-open motion type system, the sealing of the system is difficult to realize, the hot water separation and the collection of water vapor are difficult to realize, and the available value is not high. The other is through a waste heat boiler, and the defects are that the device is static heat transfer, the heat transfer efficiency is low, and the processing capacity is limited. The third is a tubular heat exchanger, which utilizes gravity to lead the reduced magnesium slag to fall from top to bottom, and the reduced magnesium slag passes through the tubular heat exchanger to heat working medium water in the heat exchanger in the falling process.
To thermal power factory high temperature sediment, one kind is through the cooling slag of recirculated cooling water cooling, and the recirculated water goes into the cooling tower with the sediment surplus heat and discharges into the atmosphere, though solved the quick refrigerated problem of sediment, nevertheless, the sediment heat can not effectively be utilized, influences boiler thermal efficiency, and the front of a business over for the business of recirculated water also causes the waste of water resource to a certain extent moreover, also causes thermal pollution to the environment simultaneously. The second is to adopt a fluidized bed slag cooler, after high-temperature slag is cooled by a fluidizing agent (air or low-temperature flue gas), the low-temperature slag is discharged into a slag removal system, and the heated fluidizing agent carries a small amount of fine particles and is sent back to the hearth by an air return pipe.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes above-mentioned prior art's is not enough, provides a counter-flow star roller heat exchanger high temperature sediment waste heat utilization system, and this system high temperature sediment coefficient of heat conductivity is high, heat exchange speed is fast, can retrieve the sensible heat that likepowder high temperature waste residue carried, can improve energy utilization efficiency, can reduce thermal pollution again.
The utility model discloses a following technical scheme realizes:
a high-temperature slag waste heat utilization system of a counter-flow star-shaped roller heat exchanger comprises a high-temperature slag bin, a star-shaped roller heat exchange system, a cold slag treatment system and a working medium circulation system, wherein a slag feeding port is arranged below the high-temperature slag bin and is connected with the star-shaped roller heat exchange system, the star-shaped roller heat exchange system comprises a plurality of star-shaped roller heat exchangers which are mutually connected in series, the slag discharging port of the last star-shaped roller heat exchanger is connected with the cold slag treatment system, and the heat exchange working medium of the star-shaped roller heat exchanger is connected with the working medium circulation system;
the high-temperature slag bin is built by refractory materials;
the star-shaped roller type heat exchanger comprises a hollow star-shaped roller, a water jacket, a bearing mechanism, a transmission mechanism, a rotary joint, a slag inlet and a slag outlet, wherein the water jacket is of a cylindrical double-layer hollow structure and comprises a water jacket shell and a water jacket inner wall, the water jacket inner wall is made of a heat-conducting corrosion-resistant material, a heat exchange working medium space is formed between the water jacket shell and the water jacket inner wall, a heat exchange working medium is arranged in the heat exchange working medium space, and the heat exchange working medium space is connected with; the water jacket heat exchange working medium space is provided with a working medium inlet and a working medium outlet, the upper end of the water jacket is provided with a slag inlet, and the lower end of the water jacket is provided with a slag outlet;
a star-shaped roller is arranged in a hollow inner cavity of the water jacket, the star-shaped roller is of a hollow structure, a plurality of heat exchange blades which are parallel to each other are arranged on the outer wall of the star-shaped roller, hollow shafts are arranged at two ends of the star-shaped roller, a bearing mechanism and a rotary joint are arranged on the hollow shafts, the hollow inner cavity of the hollow shafts is communicated with the hollow inner cavity of the star-shaped roller, and the hollow shafts are connected with a working medium circulating system through the rotary joints; the star-shaped roller is connected with and supported by the water jacket through bearing mechanisms on hollow shafts at two ends;
the slag outlet of the upper star-shaped roller heat exchanger in the star-shaped roller heat exchange system is connected with the slag inlet of the lower star-shaped roller heat exchanger, the central axis of the slag inlet is not in the same straight line with the central axis of the star-shaped roller, and the eccentric distance d exists;
the cold slag treatment system comprises a cold slag bin and a dust removal nozzle arranged in the cold slag bin, the dust removal nozzle ring is arranged around a cold slag inlet of the cold slag bin in a winding manner, and the dust removal nozzle is connected with a dust removal liquid storage tank through a water supply pipe;
the working medium circulating system comprises a water storage tank, a high-pressure circulating water pump, a water supply pipeline entering the star-shaped roller type heat exchanger, a heat supply pipeline connecting a working medium outlet of the star-shaped roller type heat exchanger to a heat using unit, the heat using unit, a cooling water return pipeline and a water replenishing pipeline, wherein the water outlet of the water storage tank is connected with the high-pressure circulating water pump through a water drawing pipe, the high-pressure circulating water pump is connected with a water jacket heat exchange working medium space of the lowest star-shaped roller type heat exchanger and a hollow inner cavity of the star-shaped roller through the water supply pipeline, the water jacket heat exchange working medium space working medium outlet of the highest star-shaped roller type heat exchanger and the hollow inner cavity of the star-shaped roller are connected with.
The slag outlet of the upper star-shaped roller type heat exchanger in the star-shaped roller type heat exchange system is connected with the slag inlet of the lower star-shaped roller type heat exchanger, and the working medium outlet of the lower star-shaped roller type heat exchanger in the star-shaped roller type heat exchange system is connected with the working medium inlet of the upper star-shaped roller type heat exchanger;
the refractory materials include, but are not limited to, high alumina refractory bricks, light weight insulating refractory bricks.
The eccentricity d and the radius R4 of the inner wall of the water jacket form a proportional relation: eccentricity e, e = d/R4, said eccentricity e ranging between "0 < e < 1".
The water storage tank is also provided with a water replenishing pipe.
And valves are arranged on each pipeline and the inlet and the outlet.
The heat exchange working medium in the working medium circulating system is water, but is not limited to water.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model overcomes the defects of low heat conductivity coefficient of the high-temperature slag, low heat exchange speed and the like. The method is suitable for but not limited to the preparation of magnesium, calcium, sodium, iron by a thermal reduction method and the recovery of sensible heat carried by powdery high-temperature waste residues such as slag, reducing slag, power plant boiler slag and the like in other industrial production processes, and can improve the energy utilization efficiency and reduce thermal pollution.
Drawings
Fig. 1 is a process route diagram for utilizing the counter-flow heat exchange high-temperature slag waste heat of the utility model.
Fig. 2 is the structural schematic diagram of the counter-flow heat exchange high-temperature slag waste heat utilization system of the utility model.
Fig. 3 is a schematic structural diagram of the star-shaped roller heat exchanger of the present invention.
Fig. 4 is a sectional view taken along line a-a of fig. 3.
Fig. 5 is a schematic view of the eccentricity d of the present invention.
In the figure, a star-shaped roller 1, a water jacket 2, a bearing mechanism 3, a rotary joint 5, a slag inlet 6, a slag outlet 7, a heat exchange space 9, a transmission direction 10, heat exchange blades 11, a hollow shaft 12, a high-temperature slag bin 13, a slag feeding port 14, a gear 15, a star-shaped roller heat exchanger 16, a cold slag bin 17, a dust removal nozzle 18, a cold slag inlet 19, a water supply pipe 20, a water jacket shell 21, a water jacket inner wall 22, a butt flange 23, a seal ring groove 24, a water storage tank 25, a high-pressure circulating water pump 26, a water drawing pipe 27, a water supply pipeline 28, a heat supply pipeline 29, a heat utilization unit 30, a cooling water return pipeline 31 and a water supplementing.
Detailed Description
The invention is further illustrated below with reference to the following examples and drawings:
a high-temperature slag waste heat utilization system of a counter-flow star-shaped roller heat exchanger comprises a high-temperature slag bin 13, a star-shaped roller heat exchange system, a cold slag treatment system and a working medium circulation system, wherein a slag feeding port 14 is arranged below the high-temperature slag bin, the slag feeding port is connected with the star-shaped roller heat exchange system, the star-shaped roller heat exchange system comprises a plurality of star-shaped roller heat exchangers 16 which are mutually connected in series, the slag discharging port of the last star-shaped roller heat exchanger is connected with the cold slag treatment system, and the heat exchange working medium of the star-shaped roller heat exchanger is connected with the;
the high-temperature slag bin 13 is built by refractory materials;
the star-shaped roller type heat exchanger comprises a hollow star-shaped roller 1, a water jacket 2, a bearing mechanism 3, a rotary joint 5, a slag inlet 6 and a slag outlet 7, wherein the water jacket is of a cylindrical double-layer hollow structure and comprises a water jacket shell 21 and a water jacket inner wall 22, the water jacket inner wall is made of a heat-conducting corrosion-resistant material, a heat exchange working medium space is formed between the water jacket shell and the water jacket inner wall, a heat exchange working medium is arranged in the water jacket shell, and the heat exchange working medium space is connected with a working;
the upper end of the water jacket is provided with a slag inlet 6, the lower end of the water jacket is provided with a slag outlet 7, the positions of the slag inlet and the slag outlet of the water jacket shell 22 are provided with butt flanges 23, and the positions of the slag inlet and the slag outlet of the inner wall of the water jacket are provided with sealing ring grooves 24;
the water jacket is connected with the high-temperature slag device through a butt flange 23, and a sealing ring groove 24 on the water jacket completely isolates and seals the inner wall of the water jacket from the high-temperature slag device through a connecting sealing ring, so that a heat exchange working medium is prevented from permeating into a heat exchange space between the water jacket and the star-shaped roller.
A star-shaped roller 1 is arranged in a hollow inner cavity of the water jacket, the star-shaped roller 1 is of a hollow structure, a plurality of heat exchange blades 11 which are parallel to each other are arranged on the outer wall of the star-shaped roller, hollow shafts 12 are arranged at two ends of the star-shaped roller, a bearing mechanism 3 and a rotary joint 5 are arranged on the hollow shafts, the hollow shafts 12 are connected with a heat exchange working medium pipeline through the rotary joints 5, and the star-shaped roller 1 is connected with and supported by the water jacket 2 through the bearing mechanisms 3 on the hollow shafts 12 at the two; the hollow inner cavity of the hollow shaft is communicated with the hollow inner cavity of the star-shaped roller, and a heat exchange working medium is arranged in the hollow inner cavity structure of the star-shaped roller. The hollow shaft is connected with a working medium circulating system through a rotary joint;
a gear 15 is arranged on a hollow shaft at one end of the star-shaped roller 1, the gear 15 is connected with a transmission mechanism, and the transmission mechanism comprises a transmission gear and a motor for providing power for the transmission gear; the rotation arrow 10 in fig. 3 shows the transmission direction of the transmission mechanism to drive the star roller to rotate.
The axial direction of the heat exchange blades 11 is consistent with the axial direction of the star-shaped roller 1.
The material of the inner wall 22 of the water jacket is one of steel, copper and alloy thereof, and aluminum and alloy thereof.
The slag outlet of the upper star-shaped roller type heat exchanger in the star-shaped roller type heat exchange system is connected with the slag inlet of the lower star-shaped roller type heat exchanger, and the working medium outlet of the lower star-shaped roller type heat exchanger in the star-shaped roller type heat exchange system is connected with the working medium inlet of the upper star-shaped roller type heat exchanger;
the cold slag treatment system comprises a cold slag bin 17 and a dust removal nozzle 18 arranged in the cold slag bin, the dust removal nozzle surrounds a cold slag inlet 19 arranged in the cold slag bin, and the dust removal nozzle 18 is connected with a dust removal liquid storage tank through a water supply pipe 20;
the working medium circulating system comprises a water storage tank 25, a high-pressure circulating water pump 26, a water supply pipeline 28 entering the star-shaped roller heat exchanger 16, a heat supply pipeline 29 connecting a working medium outlet of the star-shaped roller heat exchanger to a heat using unit, the heat using unit 30, a cooling water return pipeline 31 and a water supplementing pipeline 32, wherein the water outlet of the water storage tank 25 is connected with the high-pressure circulating water pump 26 through a water drawing pipe 27, the high-pressure circulating water pump 26 is connected with a water jacket heat exchange working medium space of the star-shaped roller heat exchanger at the lowest level and a hollow inner cavity of the star-shaped roller through the water supply pipeline 28, the water jacket heat exchange working medium space working medium outlet of the star-shaped roller heat exchanger at the uppermost level and the hollow inner cavity of the star-shaped roller are connected with the heat using unit. The water storage tank 25 is also provided with a water replenishing pipe 32.
Each set of working medium circulating system can correspondingly supply one heat exchange working medium to a plurality of sets of star-shaped roller type heat exchange systems, and as shown in figure 2, one set of working medium circulating system supplies the heat exchange working medium of two sets of star-shaped roller type heat exchange systems.
The refractory materials include, but are not limited to, high alumina refractory bricks, light weight insulating refractory bricks, and the like. The refractory material with good heat preservation is used for building, the failure caused by the high temperature of the slag in the bin is avoided, and the loss of sensible heat carried by the high temperature slag in the bin can be prevented. The method has the advantages that the high-temperature slag transported from the slag source is stored, and the working sustainability of the whole system is guaranteed.
And each pipeline and the inlet and the outlet are provided with parts such as valves and the like.
The heat exchange working medium in the working medium circulating system is water, but is not limited to water.
In actual production, the method for utilizing the waste heat by using the high-temperature slag waste heat system of the counter-flow star-shaped roller heat exchanger comprises the following steps: the high-temperature slag flow and the working medium circulation flow are in the same direction, and the transmission direction of the high-temperature slag is opposite to that of the working medium in the heating process;
the high-temperature slag flow comprises the following steps: high-temperature slag from a slag feeding port of the high-temperature slag bin enters a cold slag treatment link after being subjected to heat exchange by a plurality of star-shaped roller heat exchangers from top to bottom;
the high-temperature slag enters a heat exchange space of the first star-shaped roller heat exchanger from top to bottom in the star-shaped roller heat exchange system, is driven by the rotation of the star-shaped rollers to move to a slag outlet and fall to a slag inlet of the second star-shaped roller heat exchanger, is scattered and stirred by the first star-shaped roller heat exchanger, so that uncooled inner-layer high-temperature slag in the heat exchange process of the first star-shaped roller heat exchanger is redistributed, is cooled in the second star-shaped roller heat exchanger, and is analogized until the last star-shaped roller heat exchanger passing through the star-shaped roller heat exchange system is cooled and enters the bottom cold slag treatment system after being separated from the slag outlet.
The heat exchange process in the star-shaped roller type heat exchanger is as follows: the water jacket is fixed, and the heat exchange blades continuously rotate and move to the position of the slag inlet along with the rotation of the star-shaped roller, so that a heat exchange space 9 is formed, the high-temperature slag entering from the slag inlet is cut, and the heat exchange process is executed. The heat exchange space moves along with the rotation of the star-shaped roller, when the heat exchange space moves to the position of the slag outlet, the heat exchange space loses the restraint of the inner wall of the water jacket, cooled high-temperature slag in the heat exchange space is separated from the heat exchange space and leaves the heat exchange space, and the heat exchange process is finished. And after the slag hole is deslagged, the adjacent two heat exchange blades continue to rotate to form a slag-free space with the inner wall of the water jacket until the blades rotate to the position of the slag hole, receive newly-fed high-temperature slag and repeat the heat exchange process. The high-temperature slag in multiple times is subjected to the action of factors such as falling and the shape of the heat exchanger, and the stirring and redistribution of the high-temperature slag can be realized, so that the inner layer in the heat exchange space cannot be cooled due to poor heat conductivity and is redistributed to the outer layer, and heat exchange and cooling are carried out in the heat exchanger of the next time.
The central axis of the slag inlet and the central axis of the star-shaped roller are not on the same straight line, and an eccentric distance d exists; the eccentricity d and the radius R4 of the inner wall of the water jacket form a proportional relation: eccentricity e, e = d/R4, said eccentricity e ranging between "0 < e < 1". Has the advantages that:
1) the phenomenon that the heat exchanger is blocked due to the fact that the pressure of the high-temperature slag is too large when e =0 is prevented;
2) the power consumption in the rotating process of the star-shaped roller is reduced, if the eccentricity is properly matched with the flow and the density of the slag, the unpowered rotation can be realized, the transmission mechanism is only used as auxiliary power and safety guarantee, and the energy and the production cost are effectively saved.
The working medium circulation process comprises the following steps: and the cold working medium enters a heat unit to supply heat to the hot working medium after passing through the heat exchange of the multi-path star-shaped roller type heat exchanger from bottom to top, and the cold working medium cooled by the heat unit is recovered.
The high-pressure circulating water pump pumps the working medium from the water storage tank into a water jacket and a central control shaft cavity of the last star-shaped roller heat exchanger of the star-shaped roller heat exchanger chain through a water supply pipeline, and the working medium sequentially passes through the penultimate pass, the third pass … … and the water outlet of the first star-shaped roller heat exchanger to form steam or hot water which is conveyed to a heat consumption unit. After the working of heat unit, the condensed/cooled working medium flows back to the water storage tank and enters the next cycle.
The foregoing shows and describes the general principles of the present invention, its essential features, and advantages, and thus, the present invention has been described in considerable detail with particularity and detail without limitation to the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (5)
1. The high-temperature slag waste heat utilization system of the counter-flow star-shaped roller heat exchanger is characterized by comprising a high-temperature slag bin, a star-shaped roller heat exchange system, a cold slag treatment system and a working medium circulation system, wherein a slag feeding port is arranged below the high-temperature slag bin and is connected with the star-shaped roller heat exchange system;
the high-temperature slag bin is built by refractory materials;
the star-shaped roller type heat exchanger comprises a hollow star-shaped roller, a water jacket, a bearing mechanism, a transmission mechanism, a rotary joint, a slag inlet and a slag outlet, wherein the water jacket is of a cylindrical double-layer hollow structure and comprises a water jacket shell and a water jacket inner wall, the water jacket inner wall is made of a heat-conducting corrosion-resistant material, a heat exchange working medium space is formed between the water jacket shell and the water jacket inner wall, a heat exchange working medium is arranged in the heat exchange working medium space, and the heat exchange working medium space is connected with; the water jacket heat exchange working medium space is provided with a working medium inlet and a working medium outlet, the upper end of the water jacket is provided with a slag inlet, and the lower end of the water jacket is provided with a slag outlet;
a star-shaped roller is arranged in a hollow inner cavity of the water jacket, the star-shaped roller is of a hollow structure, a plurality of heat exchange blades which are parallel to each other are arranged on the outer wall of the star-shaped roller, hollow shafts are arranged at two ends of the star-shaped roller, a bearing mechanism and a rotary joint are arranged on the hollow shafts, the hollow inner cavity of the hollow shafts is communicated with the hollow inner cavity of the star-shaped roller, and the hollow shafts are connected with a working medium circulating system through the rotary joints; the star-shaped roller is connected with and supported by the water jacket through bearing mechanisms on hollow shafts at two ends;
the slag outlet of the upper star-shaped roller heat exchanger in the star-shaped roller heat exchange system is connected with the slag inlet of the lower star-shaped roller heat exchanger, the central axis of the slag inlet is not in the same straight line with the central axis of the star-shaped roller, and the eccentric distance d exists;
the cold slag treatment system comprises a cold slag bin and a dust removal nozzle arranged in the cold slag bin, the dust removal nozzle ring is arranged around a cold slag inlet of the cold slag bin in a winding manner, and the dust removal nozzle is connected with a dust removal liquid storage tank through a water supply pipe;
the working medium circulating system comprises a water storage tank, a high-pressure circulating water pump, a water supply pipeline entering the star-shaped roller type heat exchanger, a heat supply pipeline connecting a working medium outlet of the star-shaped roller type heat exchanger to a heat using unit, the heat using unit, a cooling water return pipeline and a water replenishing pipeline, wherein the water outlet of the water storage tank is connected with the high-pressure circulating water pump through a water drawing pipe;
and a working medium outlet of the next star-shaped roller-type heat exchanger in the star-shaped roller-type heat exchange system is connected with a working medium inlet of the next star-shaped roller-type heat exchanger.
2. The high-temperature slag waste heat utilization system of the counter-flow star roll heat exchanger as claimed in claim 1, wherein the refractory materials include, but are not limited to, high-alumina refractory bricks and light-weight heat-insulating refractory bricks.
3. The high-temperature slag waste heat utilization system of the counter-flow star-shaped roller heat exchanger as claimed in claim 1, wherein the eccentricity d is proportional to the radius R4 of the inner wall of the water jacket: eccentricity e, e = d/R4, said eccentricity e ranging between "0 < e < 1".
4. The high-temperature slag waste heat utilization system of the counter-flow star-shaped roller heat exchanger as claimed in claim 1, wherein the water storage tank is further provided with a water replenishing pipe.
5. The high-temperature slag waste heat utilization system of the counter-flow star-shaped roller heat exchanger according to claim 1, wherein the heat exchange working medium in the working medium circulation system is water, but is not limited to water.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110081727A (en) * | 2019-05-28 | 2019-08-02 | 山西八达镁业有限公司 | A kind of reverse-flow star roller heat exchanger high temperature sludge afterheat utilizing system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110081727A (en) * | 2019-05-28 | 2019-08-02 | 山西八达镁业有限公司 | A kind of reverse-flow star roller heat exchanger high temperature sludge afterheat utilizing system and method |
| CN110081727B (en) * | 2019-05-28 | 2024-03-05 | 山西八达镁业有限公司 | System and method for utilizing high-temperature slag waste heat of counter-flow star-shaped roller heat exchanger |
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