CN107560470A - A kind of heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system - Google Patents
A kind of heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system Download PDFInfo
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- CN107560470A CN107560470A CN201710933670.2A CN201710933670A CN107560470A CN 107560470 A CN107560470 A CN 107560470A CN 201710933670 A CN201710933670 A CN 201710933670A CN 107560470 A CN107560470 A CN 107560470A
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Abstract
The invention discloses a kind of heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system, comprise the following steps:Power, flow system flow and flow velocity are certain, temperature detection, calculate that big small the cold fluid and hot fluid entrance temperature difference, system calorific requirement, co-current flow, system calorific requirement, counter-current flow, system calorific requirement be moderate, counter-current flow.For the present invention in the case where system calorific requirement is small, using the type of flow of following current, SR is small, reduces unnecessary energy loss, stabilization safe for operation.The present invention is in the case where system calorific requirement is big, and using the type of flow of adverse current, mean temperature difference is big, improves heat exchanger heat exchange efficiency, meets system heat demand.Following current, adverse current checker in the present invention, avoid high temperature from concentrating on heat exchanger one end all the time, extend heat exchanger service life.According to the change of actual conditions, the flexible flow direction for changing heat exchanger fluid, the respective advantage of concurrent-countercurrent is given full play to, energy-saving effect is obvious, has good economic benefit and social benefit.
Description
Technical field
The invention belongs to a kind of heat-exchange method, and in particular to a kind of heat exchange side of adjustable concurrent-countercurrent mode high efficient heat exchanging system
Method.
Background technology
Cold and hot two fluid is exchanged heat along heat-transfer area in heat exchanger, and its temperature is along flow direction constantly change, and temperature difference is not yet
Disconnected change.The type of flow of the fluid in heat exchanger includes following current and adverse current.
The identical referred to as following current of cold and hot fluid PARALLEL FLOW and direction.Heat exchanger down current arrangement has that mean temperature difference is smaller, changes
The characteristics of hot area is greatly and cold fluid outlet temperature is less than hot fluid outlet temperature.But co-current flow causes the temperature end of cold fluid
Temperature end with hot fluid is not in the too high phenomenon of heat exchanger side wall temperature not in homonymy.
Cold and hot fluid PARALLEL FLOW but referred to as adverse current in opposite direction.In the situation of identical out temperature and heat output
Under, because the MTD of adverse current is more than following current, the heat transfer area that is needed it was found from Heat transfer equation Q=KA △ t, during adverse current
To be small during than following current;Difference variation is more uniform during adverse current, is advantageous to the stabilization of equipment.Between counter-current flow fluid relative velocity compared with
Big and cold fluid outlet temperature is not necessarily by lower than the outlet temperature of hot fluid.But during adverse current, the maximum temperature of fluid and most cold
Temperature concentrates on the both ends of heat exchanger, heat exchanging device structure respectively;Counter-flow heat exchanger is complicated, and resistance is bigger.
At present, there is its insoluble drawback in the heat exchange mode of following current or adverse current, and fundamentally restricts it and change
Hot property.
The content of the invention
The present invention proposes to solve the problems, such as that prior art is present, high the purpose is to provide a kind of adjustable concurrent-countercurrent mode
Imitate the heat-exchange method of heat-exchange system.
The technical scheme is that:A kind of heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system, including it is following
Step:
I power, flow system flow and flow velocity are certain
It is certain in power, flow system flow and flow velocity it is certain in the case of, determine calorific requirement according to actual.
II temperature detections
Detect the gateway temperature of exchanger heat fluid and the gateway temperature of heat exchanger cold fluid respectively by temperature sensor
Degree.
III calculates the cold fluid and hot fluid entrance temperature difference
The temperature information detected in controller receiving step II, and the cold fluid and hot fluid entrance temperature difference is calculated, and judge that system needs heat
Amount, step IV or step VI or step VIII are performed according to system calorific requirement.
IV system calorific requirements are small
In the case that system calorific requirement is small, the advantage in flow field is paid the utmost attention to, and performs step V.
V co-current flows
Controller controls No. I electric T-shaped valve, No. II electric T-shaped valve, turns on following current pipeline, realizes downstream heat transfer.
VI system calorific requirements are big
In the case that system calorific requirement is big, the advantage in temperature field is paid the utmost attention to, and performs step VII.
VII counter-current flows
Controller controls No. I electric T-shaped valve, No. II electric T-shaped valve, turns on adverse current pipeline, realizes countercurrent flow.
VIII system calorific requirements are moderate
In the case that system calorific requirement is moderate, counter-current flow mode preferentially is used, and perform step IV.
IV counter-current flows
Controller controls No. I electric T-shaped valve, No. II electric T-shaped valve, turns on adverse current pipeline, realizes countercurrent flow.
In the step VII, as hot fluid inlet temperature is very high, and the regular hour is continue for, from heat exchanger service life
Angle considers, co-current flow work a period of time, then proceedes to counter-current flow.
In the step IV, as hot fluid inlet temperature is very high, and the regular hour is continue for, from heat exchanger service life
Angle considers, co-current flow work a period of time, then proceedes to counter-current flow.
In the step IV, such as cold fluid and hot fluid entrance temperature difference very little, co-current flow work a period of time, adverse current is then proceeded to
Flowing.
No. I temperature sensor detection hot fluid inlet temperature, No. II temperature sensor detect hot fluid in the step II
Outlet temperature.
No. III temperature sensor detection cold fluid outlet temperature, No. IV temperature sensor detect cold fluid in the step II
Inlet temperature.
Following current pipeline includes No. II oral siphon, No. II outlet pipe connected with heat exchanger in the V, and described No. II enters water
Pipe connects with No. I electric T-shaped valve, and No. II outlet pipe connects with No. II electric T-shaped valve.
Adverse current pipeline includes No. I oral siphon, No. I outlet pipe that connects with heat exchanger in the VII, No. I oral siphon and
No. I electric T-shaped valve connection, No. I outlet pipe connect with No. II electric T-shaped valve.
No. I electric T-shaped valve other end flows into pipe with hot-fluid and connected, No. II electric T-shaped valve other end and heat
Flow back to flow tube connection.
The present invention is in the case where system calorific requirement is little, and using the type of flow of following current, SR is small, and reduction need not
The energy loss wanted, stabilization safe for operation.
The present invention is in the case where system calorific requirement is big, and using the type of flow of adverse current, mean temperature difference is big, improves heat exchanger
Heat exchange efficiency, meet system heat demand.
Following current, adverse current checker in the present invention, avoid high temperature from concentrating on heat exchanger one end all the time, extend heat exchanger and use
Life-span.
The present invention the flexible flow direction for changing heat exchanger fluid, is given full play to along inverse according to the change of actual conditions
Respective advantage is flowed, energy-saving effect is obvious, has good economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is the connection diagram of the present invention;
Fig. 2 is flow chart of the method for the present invention;
Wherein:
The controller of 1 heat exchanger 2
3 hot-fluids flow into the hot fluid return pipe of pipe 4
The cold flow of 5 cold fluid return pipe 6 flows into pipe
7 No. I electric T-shaped valves, 8 No. II electric T-shaped valves
9 No. I temperature sensors, 10 No. II temperature sensors
11 No. III temperature sensors, 12 No. IV temperature sensors
13 No. I oral siphons, 14 No. II oral siphons
15 No. I outlet pipes, 16 No. II outlet pipes.
Embodiment
Hereinafter, referring to the drawings and embodiment the present invention is described in detail:
As shown in Figure 1 and 2, a kind of heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system, comprises the following steps:
I power, flow system flow and flow velocity are certain
It is certain in power, flow system flow and flow velocity it is certain in the case of, determine calorific requirement according to actual.
II temperature detections
Detect the gateway temperature of the hot fluid of heat exchanger 1 and the gateway temperature of heat exchanger cold fluid respectively by temperature sensor
Degree.
III calculates the cold fluid and hot fluid entrance temperature difference
The temperature information detected in the receiving step II of controller 2, and the cold fluid and hot fluid entrance temperature difference is calculated, and judge that system needs heat
Amount, step IV or step VI or step VIII are performed according to system calorific requirement.
IV system calorific requirements are small
In the case that system calorific requirement is small, the advantage in flow field is paid the utmost attention to, and performs step V.
V co-current flows
Controller 2 controls 7, No. II electric T-shaped valves 8 of No. I electric T-shaped valve, turns on following current pipeline, realizes downstream heat transfer.
VI system calorific requirements are big
In the case that system calorific requirement is big, the advantage in temperature field is paid the utmost attention to, and performs step VII.
VII counter-current flows
Controller 2 controls 7, No. II electric T-shaped valves 8 of No. I electric T-shaped valve, turns on adverse current pipeline, realizes countercurrent flow.
VIII system calorific requirements are moderate
In the case that system calorific requirement is moderate, counter-current flow mode preferentially is used, and perform step IV.
IV counter-current flows
Controller 2 controls 7, No. II electric T-shaped valves 8 of No. I electric T-shaped valve, turns on adverse current pipeline, realizes countercurrent flow.
In the step VII, as hot fluid inlet temperature is very high, and the regular hour is continue for, from heat exchanger service life
Angle considers, co-current flow work a period of time, then proceedes to counter-current flow.
In the step IV, as hot fluid inlet temperature is very high, and the regular hour is continue for, from heat exchanger service life
Angle considers, co-current flow work a period of time, then proceedes to counter-current flow.
In the step IV, such as cold fluid and hot fluid entrance temperature difference very little, co-current flow work a period of time, adverse current is then proceeded to
Flowing.
No. I temperature sensor detection hot fluid inlet temperature, No. II temperature sensor detect hot fluid in the step II
Outlet temperature.
No. III temperature sensor detection cold fluid outlet temperature, No. IV temperature sensor detect cold fluid in the step II
Inlet temperature.
Following current pipeline includes 14, No. II outlet pipes 16 of No. II oral siphon for being connected with heat exchanger 1 in the V, described No. II
Oral siphon 14 connects 7 with No. I electric T-shaped valve, and No. II outlet pipe 16 connects with No. II electric T-shaped valve 8.
Adverse current pipeline includes 13, No. I outlet pipes 15 of No. I oral siphon connected with heat exchanger in the VII, and described No. I enters water
Pipe 13 connects with No. I electric T-shaped valve 7, and No. I outlet pipe 15 connects with No. II electric T-shaped valve 8.
No. I other end of electric T-shaped valve 7 and hot-fluid flow into pipe 3 and connected, No. II other end of electric T-shaped valve 8 with
Hot fluid return pipe 4 connects.
The step V co-current flow makes the flow direction of hot fluid identical with the flow direction of cold fluid, reduces flowing
Resistance.
Step VII and step the IV counter-current flow makes the flow direction of hot fluid and the flow direction of cold fluid on the contrary, filling
The advantages of its heat exchange efficiency is high is waved in distribution.
Hot-fluid flows into pipe 3 and connected with No. I electric T-shaped valve 7 in the present invention, hot fluid return pipe 4 and No. II electric T-shaped valve 8
Connection.
The 7 other both ends of No. I electric T-shaped valve connect with 13, No. II oral siphons 14 of No. I oral siphon respectively, described No. I
13, No. II oral siphons 14 of oral siphon connect with heat exchanger 1.
The 8 other both ends of No. II electric T-shaped valve connect with 15, No. II outlet pipes 16 of No. I outlet pipe respectively, described No. I
15, No. II outlet pipes 16 of outlet pipe connect with heat exchanger 1.
The cold flow flows into pipe 6, cold fluid return pipe 5 connects with the opposite side of heat exchanger 1.
The cold flow is flowed into pipe 6 and is provided with No. IV temperature sensor 12, and No. III temperature is provided with the cold fluid return pipe 5
Spend sensor 11.Described 12, No. III 11 equal circuits of temperature sensor of No. IV temperature sensor are linked into controller 2.
The hot-fluid is flowed into pipe 3 and is provided with No. I temperature sensor 9, and No. II temperature is provided with the hot fluid return pipe 4
Sensor 10, described 9, No. II 10 equal circuits of temperature sensor of No. I temperature sensor are linked into controller 2.
The present invention is in the case where system calorific requirement is little, and using the type of flow of following current, SR is small, and it is unnecessary to reduce
Energy loss, stabilization safe for operation.
The present invention is in the case where system calorific requirement is big, and using the type of flow of adverse current, mean temperature difference is big, improves heat exchanger
Heat exchange efficiency, meet system heat demand.
Following current, adverse current checker in the present invention, avoid high temperature from concentrating on heat exchanger one end all the time, extend heat exchanger and use
Life-span.
The present invention the flexible flow direction for changing heat exchanger fluid, is given full play to along inverse according to the change of actual conditions
Respective advantage is flowed, energy-saving effect is obvious, has good economic benefit and social benefit.
Claims (9)
- A kind of 1. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system, it is characterised in that:Comprise the following steps:(ⅰ)Power, flow system flow and flow velocity are certainIt is certain in power, flow system flow and flow velocity it is certain in the case of, determine calorific requirement according to actual;(ⅱ)Temperature detectionDetect the gateway temperature of exchanger heat fluid and the gateway temperature of heat exchanger cold fluid respectively by temperature sensor Degree;(ⅲ)Calculate the cold fluid and hot fluid entrance temperature differenceController receiving step(ⅱ)The temperature information of middle detection, and the cold fluid and hot fluid entrance temperature difference is calculated, and judge that system needs Heat, step is performed according to system calorific requirement(ⅳ)Or step(ⅵ)Or step(ⅷ);(ⅳ)System calorific requirement is smallIn the case that system calorific requirement is small, the advantage in flow field is paid the utmost attention to, and performs step(ⅴ);(ⅴ)Co-current flowController controls No. I electric T-shaped valve, No. II electric T-shaped valve, turns on following current pipeline, realizes downstream heat transfer;(ⅵ)System calorific requirement is bigIn the case that system calorific requirement is big, the advantage in temperature field is paid the utmost attention to, and performs step(ⅶ);(ⅶ)Counter-current flowController controls No. I electric T-shaped valve, No. II electric T-shaped valve, turns on adverse current pipeline, realizes countercurrent flow;(ⅷ)System calorific requirement is moderateIn the case that system calorific requirement is moderate, counter-current flow mode preferentially is used, and perform step(ⅸ);(ⅸ)Counter-current flowController controls No. I electric T-shaped valve, No. II electric T-shaped valve, turns on adverse current pipeline, realizes countercurrent flow.
- A kind of 2. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: The step(ⅶ)In, as hot fluid inlet temperature is very high, and the regular hour is continue for, examined from heat exchanger service life angle Consider, co-current flow work a period of time, then proceed to counter-current flow.
- A kind of 3. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: The step(ⅸ)In, as hot fluid inlet temperature is very high, and the regular hour is continue for, examined from heat exchanger service life angle Consider, co-current flow work a period of time, then proceed to counter-current flow.
- A kind of 4. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: The step(ⅸ)In, such as cold fluid and hot fluid entrance temperature difference very little, co-current flow work a period of time, then proceed to counter-current flow.
- A kind of 5. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: The step(ⅱ)In No. I temperature sensor detection hot fluid inlet temperature, No. II temperature sensor detect hot fluid outlet ports temperature Degree.
- A kind of 6. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: The step(ⅱ)In No. III temperature sensor detection cold fluid outlet temperature, No. IV temperature sensor detect cold fluid inlet temperature Degree.
- A kind of 7. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: It is described(ⅴ)Middle following current pipeline includes No. II oral siphon, No. II outlet pipe that are connected with heat exchanger, No. II oral siphon and No. I Electric T-shaped valve connects, and No. II outlet pipe connects with No. II electric T-shaped valve.
- A kind of 8. heat-exchange method of adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 1, it is characterised in that: It is described(ⅶ)Middle adverse current pipeline includes No. I oral siphon, No. I outlet pipe connected with heat exchanger, No. I oral siphon and No. I electricity Dynamic triple valve connection, No. I outlet pipe connect with No. II electric T-shaped valve.
- 9. the heat-exchange method of any one adjustable concurrent-countercurrent mode high efficient heat exchanging system according to claim 7 or 8, it is special Sign is:No. I electric T-shaped valve other end flows into pipe with hot-fluid and connected, No. II electric T-shaped valve other end and hot-fluid Return duct connects.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110823616A (en) * | 2019-11-21 | 2020-02-21 | 青岛大学 | Desktop type self-supply water heat exchanger performance testing device |
CN115265067A (en) * | 2022-06-28 | 2022-11-01 | 大力神铝业股份有限公司 | Vertical distribution's double-chamber formula cooling trough system |
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CN102150003A (en) * | 2008-09-23 | 2011-08-10 | 阿尔斯通技术有限公司 | Tubular heat exchanger for controlling a wide performance range |
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2017
- 2017-10-10 CN CN201710933670.2A patent/CN107560470A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102150003A (en) * | 2008-09-23 | 2011-08-10 | 阿尔斯通技术有限公司 | Tubular heat exchanger for controlling a wide performance range |
Non-Patent Citations (1)
Title |
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陈雅梅: "《石油技工学校试用教材 热工理论基础》", 31 May 1988, 石油工业出版社 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110823616A (en) * | 2019-11-21 | 2020-02-21 | 青岛大学 | Desktop type self-supply water heat exchanger performance testing device |
CN110823616B (en) * | 2019-11-21 | 2021-04-27 | 青岛大学 | Desktop type self-supply water heat exchanger performance testing device |
CN115265067A (en) * | 2022-06-28 | 2022-11-01 | 大力神铝业股份有限公司 | Vertical distribution's double-chamber formula cooling trough system |
CN115265067B (en) * | 2022-06-28 | 2024-02-20 | 大力神铝业股份有限公司 | Vertical-distribution double-cavity cooling water tank system |
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